8df7a775 |
1 | #include <windows.h> |
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2 | #include <stdio.h> |
3 | #include <stdlib.h> |
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4 | #include <stdarg.h> |
5 | #include <assert.h> |
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6 | |
7 | #include "putty.h" |
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8 | #include "tree234.h" |
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9 | #include "ssh.h" |
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10 | |
11 | #ifndef FALSE |
12 | #define FALSE 0 |
13 | #endif |
14 | #ifndef TRUE |
15 | #define TRUE 1 |
16 | #endif |
17 | |
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18 | #define logevent(s) { logevent(s); \ |
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19 | if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \ |
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20 | fprintf(stderr, "%s\n", s); } |
21 | |
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22 | #define bombout(msg) ( ssh_state = SSH_STATE_CLOSED, \ |
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23 | (s ? sk_close(s), s = NULL : 0), \ |
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24 | connection_fatal msg ) |
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25 | |
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26 | #define SSH1_MSG_DISCONNECT 1 /* 0x1 */ |
27 | #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */ |
28 | #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */ |
29 | #define SSH1_CMSG_USER 4 /* 0x4 */ |
30 | #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */ |
31 | #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */ |
32 | #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */ |
33 | #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */ |
34 | #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */ |
35 | #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */ |
36 | #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */ |
37 | #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */ |
38 | #define SSH1_SMSG_SUCCESS 14 /* 0xe */ |
39 | #define SSH1_SMSG_FAILURE 15 /* 0xf */ |
40 | #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */ |
41 | #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */ |
42 | #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */ |
43 | #define SSH1_CMSG_EOF 19 /* 0x13 */ |
44 | #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */ |
45 | #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */ |
46 | #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */ |
47 | #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */ |
48 | #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */ |
49 | #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */ |
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50 | #define SSH1_SMSG_X11_OPEN 27 /* 0x1b */ |
51 | #define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */ |
52 | #define SSH1_MSG_PORT_OPEN 29 /* 0x1d */ |
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53 | #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */ |
54 | #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */ |
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55 | #define SSH1_MSG_IGNORE 32 /* 0x20 */ |
9c964e85 |
56 | #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */ |
57 | #define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */ |
58 | #define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */ |
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59 | #define SSH1_MSG_DEBUG 36 /* 0x24 */ |
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60 | #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */ |
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61 | #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */ |
62 | #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */ |
63 | #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */ |
64 | #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */ |
65 | #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */ |
66 | #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */ |
67 | |
68 | #define SSH1_AUTH_TIS 5 /* 0x5 */ |
69 | #define SSH1_AUTH_CCARD 16 /* 0x10 */ |
70 | |
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71 | #define SSH2_MSG_DISCONNECT 1 /* 0x1 */ |
72 | #define SSH2_MSG_IGNORE 2 /* 0x2 */ |
73 | #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */ |
74 | #define SSH2_MSG_DEBUG 4 /* 0x4 */ |
75 | #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */ |
76 | #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */ |
77 | #define SSH2_MSG_KEXINIT 20 /* 0x14 */ |
78 | #define SSH2_MSG_NEWKEYS 21 /* 0x15 */ |
79 | #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */ |
80 | #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */ |
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81 | #define SSH2_MSG_KEX_DH_GEX_REQUEST 30 /* 0x1e */ |
82 | #define SSH2_MSG_KEX_DH_GEX_GROUP 31 /* 0x1f */ |
83 | #define SSH2_MSG_KEX_DH_GEX_INIT 32 /* 0x20 */ |
84 | #define SSH2_MSG_KEX_DH_GEX_REPLY 33 /* 0x21 */ |
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85 | #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */ |
86 | #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */ |
87 | #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */ |
88 | #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */ |
89 | #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */ |
90 | #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */ |
91 | #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */ |
92 | #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */ |
93 | #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */ |
94 | #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */ |
95 | #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */ |
96 | #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */ |
97 | #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */ |
98 | #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */ |
99 | #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */ |
100 | #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */ |
101 | #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */ |
102 | #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */ |
103 | #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */ |
104 | #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */ |
105 | |
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106 | #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */ |
107 | #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */ |
108 | #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */ |
109 | #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */ |
110 | #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */ |
111 | #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */ |
112 | #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */ |
113 | #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */ |
114 | #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */ |
115 | #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */ |
116 | #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */ |
117 | |
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118 | #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */ |
119 | #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */ |
120 | #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */ |
121 | #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */ |
122 | |
123 | #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */ |
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124 | |
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125 | /* |
126 | * Various remote-bug flags. |
127 | */ |
128 | #define BUG_CHOKES_ON_SSH1_IGNORE 1 |
129 | #define BUG_SSH2_HMAC 2 |
130 | |
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131 | #define GET_32BIT(cp) \ |
132 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
133 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
134 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
135 | ((unsigned long)(unsigned char)(cp)[3])) |
136 | |
137 | #define PUT_32BIT(cp, value) { \ |
138 | (cp)[0] = (unsigned char)((value) >> 24); \ |
139 | (cp)[1] = (unsigned char)((value) >> 16); \ |
140 | (cp)[2] = (unsigned char)((value) >> 8); \ |
141 | (cp)[3] = (unsigned char)(value); } |
142 | |
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143 | enum { PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR, PKT_BIGNUM }; |
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144 | |
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145 | /* Coroutine mechanics for the sillier bits of the code */ |
146 | #define crBegin1 static int crLine = 0; |
147 | #define crBegin2 switch(crLine) { case 0:; |
148 | #define crBegin crBegin1; crBegin2; |
149 | #define crFinish(z) } crLine = 0; return (z) |
150 | #define crFinishV } crLine = 0; return |
151 | #define crReturn(z) \ |
152 | do {\ |
153 | crLine=__LINE__; return (z); case __LINE__:;\ |
154 | } while (0) |
155 | #define crReturnV \ |
156 | do {\ |
157 | crLine=__LINE__; return; case __LINE__:;\ |
158 | } while (0) |
159 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
160 | #define crStopV do{ crLine = 0; return; }while(0) |
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161 | #define crWaitUntil(c) do { crReturn(0); } while (!(c)) |
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162 | #define crWaitUntilV(c) do { crReturnV; } while (!(c)) |
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163 | |
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164 | extern char *x11_init (Socket *, char *, void *); |
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165 | extern void x11_close (Socket); |
166 | extern void x11_send (Socket , char *, int); |
167 | extern void x11_invent_auth(char *, int, char *, int); |
168 | |
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169 | /* |
170 | * Ciphers for SSH2. We miss out single-DES because it isn't |
171 | * supported; also 3DES and Blowfish are both done differently from |
172 | * SSH1. (3DES uses outer chaining; Blowfish has the opposite |
173 | * endianness and different-sized keys.) |
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174 | */ |
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175 | const static struct ssh2_ciphers *ciphers[] = { |
176 | &ssh2_aes, |
177 | &ssh2_blowfish, |
178 | &ssh2_3des, |
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179 | }; |
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180 | |
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181 | const static struct ssh_kex *kex_algs[] = { |
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182 | &ssh_diffiehellman_gex, |
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183 | &ssh_diffiehellman }; |
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184 | |
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185 | const static struct ssh_signkey *hostkey_algs[] = { &ssh_rsa, &ssh_dss }; |
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186 | |
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187 | static void nullmac_key(unsigned char *key) { } |
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188 | static void nullmac_generate(unsigned char *blk, int len, unsigned long seq) { } |
189 | static int nullmac_verify(unsigned char *blk, int len, unsigned long seq) { return 1; } |
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190 | const static struct ssh_mac ssh_mac_none = { |
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191 | nullmac_key, nullmac_key, nullmac_generate, nullmac_verify, "none", 0 |
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192 | }; |
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193 | const static struct ssh_mac *macs[] = { |
194 | &ssh_sha1, &ssh_md5, &ssh_mac_none }; |
195 | const static struct ssh_mac *buggymacs[] = { |
196 | &ssh_sha1_buggy, &ssh_md5, &ssh_mac_none }; |
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197 | |
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198 | static void ssh_comp_none_init(void) { } |
199 | static int ssh_comp_none_block(unsigned char *block, int len, |
200 | unsigned char **outblock, int *outlen) { |
201 | return 0; |
202 | } |
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203 | static int ssh_comp_none_disable(void) { return 0; } |
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204 | const static struct ssh_compress ssh_comp_none = { |
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205 | "none", |
206 | ssh_comp_none_init, ssh_comp_none_block, |
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207 | ssh_comp_none_init, ssh_comp_none_block, |
208 | ssh_comp_none_disable |
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209 | }; |
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210 | extern const struct ssh_compress ssh_zlib; |
211 | const static struct ssh_compress *compressions[] = { |
212 | &ssh_zlib, &ssh_comp_none }; |
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213 | |
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214 | enum { /* channel types */ |
215 | CHAN_MAINSESSION, |
216 | CHAN_X11, |
217 | CHAN_AGENT, |
218 | }; |
219 | |
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220 | /* |
221 | * 2-3-4 tree storing channels. |
222 | */ |
223 | struct ssh_channel { |
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224 | unsigned remoteid, localid; |
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225 | int type; |
226 | int closes; |
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227 | struct ssh2_data_channel { |
228 | unsigned char *outbuffer; |
229 | unsigned outbuflen, outbufsize; |
230 | unsigned remwindow, remmaxpkt; |
231 | } v2; |
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232 | union { |
233 | struct ssh_agent_channel { |
234 | unsigned char *message; |
235 | unsigned char msglen[4]; |
236 | int lensofar, totallen; |
237 | } a; |
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238 | struct ssh_x11_channel { |
239 | Socket s; |
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240 | } x11; |
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241 | } u; |
242 | }; |
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243 | |
244 | struct Packet { |
245 | long length; |
246 | int type; |
247 | unsigned char *data; |
248 | unsigned char *body; |
249 | long savedpos; |
250 | long maxlen; |
251 | }; |
252 | |
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253 | static SHA_State exhash, exhashbase; |
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254 | |
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255 | static Socket s = NULL; |
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256 | |
257 | static unsigned char session_key[32]; |
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258 | static int ssh1_compressing; |
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259 | static int ssh_agentfwd_enabled; |
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260 | static int ssh_X11_fwd_enabled; |
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261 | static int ssh_remote_bugs; |
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262 | static const struct ssh_cipher *cipher = NULL; |
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263 | static const struct ssh2_cipher *cscipher = NULL; |
264 | static const struct ssh2_cipher *sccipher = NULL; |
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265 | static const struct ssh_mac *csmac = NULL; |
266 | static const struct ssh_mac *scmac = NULL; |
267 | static const struct ssh_compress *cscomp = NULL; |
268 | static const struct ssh_compress *sccomp = NULL; |
269 | static const struct ssh_kex *kex = NULL; |
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270 | static const struct ssh_signkey *hostkey = NULL; |
65a22376 |
271 | static unsigned char ssh2_session_id[20]; |
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272 | int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = NULL; |
273 | |
274 | static char *savedhost; |
275 | static int savedport; |
276 | static int ssh_send_ok; |
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277 | static int ssh_echoing, ssh_editing; |
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278 | |
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279 | static tree234 *ssh_channels; /* indexed by local id */ |
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280 | static struct ssh_channel *mainchan; /* primary session channel */ |
281 | |
282 | static enum { |
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283 | SSH_STATE_PREPACKET, |
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284 | SSH_STATE_BEFORE_SIZE, |
285 | SSH_STATE_INTERMED, |
286 | SSH_STATE_SESSION, |
287 | SSH_STATE_CLOSED |
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288 | } ssh_state = SSH_STATE_PREPACKET; |
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289 | |
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290 | static int size_needed = FALSE, eof_needed = FALSE; |
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291 | |
292 | static struct Packet pktin = { 0, 0, NULL, NULL, 0 }; |
293 | static struct Packet pktout = { 0, 0, NULL, NULL, 0 }; |
b185170a |
294 | static unsigned char *deferred_send_data = NULL; |
295 | static int deferred_len = 0, deferred_size = 0; |
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296 | |
297 | static int ssh_version; |
298 | static void (*ssh_protocol)(unsigned char *in, int inlen, int ispkt); |
299 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt); |
300 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt); |
301 | static void ssh_size(void); |
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302 | static void ssh_special (Telnet_Special); |
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303 | static void ssh2_try_send(struct ssh_channel *c); |
304 | static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, int len); |
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305 | |
306 | static int (*s_rdpkt)(unsigned char **data, int *datalen); |
307 | |
308 | static struct rdpkt1_state_tag { |
309 | long len, pad, biglen, to_read; |
310 | unsigned long realcrc, gotcrc; |
311 | unsigned char *p; |
312 | int i; |
313 | int chunk; |
314 | } rdpkt1_state; |
315 | |
960e736a |
316 | static struct rdpkt2_state_tag { |
317 | long len, pad, payload, packetlen, maclen; |
318 | int i; |
319 | int cipherblk; |
320 | unsigned long incoming_sequence; |
321 | } rdpkt2_state; |
322 | |
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323 | static int ssh_channelcmp(void *av, void *bv) { |
324 | struct ssh_channel *a = (struct ssh_channel *)av; |
325 | struct ssh_channel *b = (struct ssh_channel *)bv; |
326 | if (a->localid < b->localid) return -1; |
327 | if (a->localid > b->localid) return +1; |
328 | return 0; |
329 | } |
330 | static int ssh_channelfind(void *av, void *bv) { |
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331 | unsigned *a = (unsigned *)av; |
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332 | struct ssh_channel *b = (struct ssh_channel *)bv; |
333 | if (*a < b->localid) return -1; |
334 | if (*a > b->localid) return +1; |
335 | return 0; |
336 | } |
337 | |
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338 | static void c_write (char *buf, int len) { |
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339 | if ((flags & FLAG_STDERR)) { |
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340 | int i; |
341 | for (i = 0; i < len; i++) |
342 | if (buf[i] != '\r') |
343 | fputc(buf[i], stderr); |
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344 | return; |
345 | } |
fe50e814 |
346 | from_backend(1, buf, len); |
3bdaf79d |
347 | } |
348 | |
1408a877 |
349 | static void c_write_str (char *buf) { |
350 | c_write(buf, strlen(buf)); |
351 | } |
352 | |
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353 | /* |
354 | * Collect incoming data in the incoming packet buffer. |
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355 | * Decipher and verify the packet when it is completely read. |
356 | * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets. |
fb09bf1c |
357 | * Update the *data and *datalen variables. |
358 | * Return the additional nr of bytes needed, or 0 when |
359 | * a complete packet is available. |
360 | */ |
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361 | static int ssh1_rdpkt(unsigned char **data, int *datalen) |
fb09bf1c |
362 | { |
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363 | struct rdpkt1_state_tag *st = &rdpkt1_state; |
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364 | |
365 | crBegin; |
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366 | |
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367 | next_packet: |
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368 | |
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369 | pktin.type = 0; |
370 | pktin.length = 0; |
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371 | |
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372 | for (st->i = st->len = 0; st->i < 4; st->i++) { |
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373 | while ((*datalen) == 0) |
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374 | crReturn(4-st->i); |
375 | st->len = (st->len << 8) + **data; |
fb09bf1c |
376 | (*data)++, (*datalen)--; |
377 | } |
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378 | |
fb09bf1c |
379 | #ifdef FWHACK |
57476f6b |
380 | if (st->len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
381 | st->len = 0x300; /* big enough to carry to end */ |
fb09bf1c |
382 | } |
383 | #endif |
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384 | |
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385 | st->pad = 8 - (st->len % 8); |
386 | st->biglen = st->len + st->pad; |
387 | pktin.length = st->len - 5; |
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388 | |
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389 | if (pktin.maxlen < st->biglen) { |
390 | pktin.maxlen = st->biglen; |
dcbde236 |
391 | pktin.data = (pktin.data == NULL ? smalloc(st->biglen+APIEXTRA) : |
392 | srealloc(pktin.data, st->biglen+APIEXTRA)); |
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393 | if (!pktin.data) |
394 | fatalbox("Out of memory"); |
395 | } |
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396 | |
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397 | st->to_read = st->biglen; |
398 | st->p = pktin.data; |
399 | while (st->to_read > 0) { |
400 | st->chunk = st->to_read; |
fb09bf1c |
401 | while ((*datalen) == 0) |
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402 | crReturn(st->to_read); |
403 | if (st->chunk > (*datalen)) |
404 | st->chunk = (*datalen); |
405 | memcpy(st->p, *data, st->chunk); |
406 | *data += st->chunk; |
407 | *datalen -= st->chunk; |
408 | st->p += st->chunk; |
409 | st->to_read -= st->chunk; |
fb09bf1c |
410 | } |
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411 | |
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412 | if (cipher) |
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413 | cipher->decrypt(pktin.data, st->biglen); |
698a5108 |
414 | #if 0 |
415 | debug(("Got packet len=%d pad=%d\r\n", st->len, st->pad)); |
416 | for (st->i = 0; st->i < st->biglen; st->i++) |
417 | debug((" %02x", (unsigned char)pktin.data[st->i])); |
418 | debug(("\r\n")); |
419 | #endif |
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420 | |
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421 | st->realcrc = crc32(pktin.data, st->biglen-4); |
422 | st->gotcrc = GET_32BIT(pktin.data+st->biglen-4); |
423 | if (st->gotcrc != st->realcrc) { |
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424 | bombout(("Incorrect CRC received on packet")); |
425 | crReturn(0); |
fb09bf1c |
426 | } |
572f871e |
427 | |
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428 | pktin.body = pktin.data + st->pad + 1; |
429 | |
430 | if (ssh1_compressing) { |
431 | unsigned char *decompblk; |
432 | int decomplen; |
433 | #if 0 |
434 | int i; |
435 | debug(("Packet payload pre-decompression:\n")); |
436 | for (i = -1; i < pktin.length; i++) |
437 | debug((" %02x", (unsigned char)pktin.body[i])); |
438 | debug(("\r\n")); |
439 | #endif |
440 | zlib_decompress_block(pktin.body-1, pktin.length+1, |
441 | &decompblk, &decomplen); |
442 | |
443 | if (pktin.maxlen < st->pad + decomplen) { |
444 | pktin.maxlen = st->pad + decomplen; |
dcbde236 |
445 | pktin.data = srealloc(pktin.data, pktin.maxlen+APIEXTRA); |
58298665 |
446 | pktin.body = pktin.data + st->pad + 1; |
4ba9b64b |
447 | if (!pktin.data) |
448 | fatalbox("Out of memory"); |
449 | } |
450 | |
451 | memcpy(pktin.body-1, decompblk, decomplen); |
dcbde236 |
452 | sfree(decompblk); |
4ba9b64b |
453 | pktin.length = decomplen-1; |
454 | #if 0 |
455 | debug(("Packet payload post-decompression:\n")); |
456 | for (i = -1; i < pktin.length; i++) |
457 | debug((" %02x", (unsigned char)pktin.body[i])); |
458 | debug(("\r\n")); |
459 | #endif |
460 | } |
461 | |
e5574168 |
462 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
463 | pktin.type == SSH1_SMSG_STDERR_DATA || |
464 | pktin.type == SSH1_MSG_DEBUG || |
18515c51 |
465 | pktin.type == SSH1_SMSG_AUTH_TIS_CHALLENGE || |
466 | pktin.type == SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
fb09bf1c |
467 | long strlen = GET_32BIT(pktin.body); |
8d5de777 |
468 | if (strlen + 4 != pktin.length) { |
469 | bombout(("Received data packet with bogus string length")); |
470 | crReturn(0); |
471 | } |
fb09bf1c |
472 | } |
473 | |
4ba9b64b |
474 | pktin.type = pktin.body[-1]; |
475 | |
e5574168 |
476 | if (pktin.type == SSH1_MSG_DEBUG) { |
fb09bf1c |
477 | /* log debug message */ |
478 | char buf[80]; |
479 | int strlen = GET_32BIT(pktin.body); |
480 | strcpy(buf, "Remote: "); |
481 | if (strlen > 70) strlen = 70; |
482 | memcpy(buf+8, pktin.body+4, strlen); |
483 | buf[8+strlen] = '\0'; |
484 | logevent(buf); |
485 | goto next_packet; |
e5574168 |
486 | } else if (pktin.type == SSH1_MSG_IGNORE) { |
fb09bf1c |
487 | /* do nothing */ |
488 | goto next_packet; |
489 | } |
490 | |
491 | crFinish(0); |
492 | } |
493 | |
e5574168 |
494 | static int ssh2_rdpkt(unsigned char **data, int *datalen) |
495 | { |
960e736a |
496 | struct rdpkt2_state_tag *st = &rdpkt2_state; |
e5574168 |
497 | |
498 | crBegin; |
499 | |
500 | next_packet: |
e5574168 |
501 | pktin.type = 0; |
502 | pktin.length = 0; |
960e736a |
503 | if (sccipher) |
504 | st->cipherblk = sccipher->blksize; |
e5574168 |
505 | else |
960e736a |
506 | st->cipherblk = 8; |
507 | if (st->cipherblk < 8) |
508 | st->cipherblk = 8; |
509 | |
510 | if (pktin.maxlen < st->cipherblk) { |
511 | pktin.maxlen = st->cipherblk; |
dcbde236 |
512 | pktin.data = (pktin.data == NULL ? smalloc(st->cipherblk+APIEXTRA) : |
513 | srealloc(pktin.data, st->cipherblk+APIEXTRA)); |
e5574168 |
514 | if (!pktin.data) |
515 | fatalbox("Out of memory"); |
516 | } |
517 | |
518 | /* |
519 | * Acquire and decrypt the first block of the packet. This will |
520 | * contain the length and padding details. |
521 | */ |
960e736a |
522 | for (st->i = st->len = 0; st->i < st->cipherblk; st->i++) { |
e5574168 |
523 | while ((*datalen) == 0) |
960e736a |
524 | crReturn(st->cipherblk-st->i); |
525 | pktin.data[st->i] = *(*data)++; |
e5574168 |
526 | (*datalen)--; |
527 | } |
528 | #ifdef FWHACK |
529 | if (!memcmp(pktin.data, "Remo", 4)) {/* "Remo"te server has closed ... */ |
530 | /* FIXME */ |
531 | } |
532 | #endif |
533 | if (sccipher) |
960e736a |
534 | sccipher->decrypt(pktin.data, st->cipherblk); |
e5574168 |
535 | |
536 | /* |
537 | * Now get the length and padding figures. |
538 | */ |
960e736a |
539 | st->len = GET_32BIT(pktin.data); |
540 | st->pad = pktin.data[4]; |
e5574168 |
541 | |
542 | /* |
543 | * This enables us to deduce the payload length. |
544 | */ |
960e736a |
545 | st->payload = st->len - st->pad - 1; |
e5574168 |
546 | |
960e736a |
547 | pktin.length = st->payload + 5; |
e5574168 |
548 | |
549 | /* |
550 | * So now we can work out the total packet length. |
551 | */ |
960e736a |
552 | st->packetlen = st->len + 4; |
553 | st->maclen = scmac ? scmac->len : 0; |
e5574168 |
554 | |
555 | /* |
556 | * Adjust memory allocation if packet is too big. |
557 | */ |
960e736a |
558 | if (pktin.maxlen < st->packetlen+st->maclen) { |
559 | pktin.maxlen = st->packetlen+st->maclen; |
dcbde236 |
560 | pktin.data = (pktin.data == NULL ? smalloc(pktin.maxlen+APIEXTRA) : |
561 | srealloc(pktin.data, pktin.maxlen+APIEXTRA)); |
e5574168 |
562 | if (!pktin.data) |
563 | fatalbox("Out of memory"); |
564 | } |
565 | |
566 | /* |
567 | * Read and decrypt the remainder of the packet. |
568 | */ |
960e736a |
569 | for (st->i = st->cipherblk; st->i < st->packetlen + st->maclen; st->i++) { |
e5574168 |
570 | while ((*datalen) == 0) |
960e736a |
571 | crReturn(st->packetlen + st->maclen - st->i); |
572 | pktin.data[st->i] = *(*data)++; |
e5574168 |
573 | (*datalen)--; |
574 | } |
575 | /* Decrypt everything _except_ the MAC. */ |
576 | if (sccipher) |
960e736a |
577 | sccipher->decrypt(pktin.data + st->cipherblk, |
578 | st->packetlen - st->cipherblk); |
e5574168 |
579 | |
7cca0d81 |
580 | #if 0 |
960e736a |
581 | debug(("Got packet len=%d pad=%d\r\n", st->len, st->pad)); |
582 | for (st->i = 0; st->i < st->packetlen; st->i++) |
583 | debug((" %02x", (unsigned char)pktin.data[st->i])); |
d39f364a |
584 | debug(("\r\n")); |
7cca0d81 |
585 | #endif |
d39f364a |
586 | |
e5574168 |
587 | /* |
588 | * Check the MAC. |
589 | */ |
960e736a |
590 | if (scmac && !scmac->verify(pktin.data, st->len+4, st->incoming_sequence)) { |
8d5de777 |
591 | bombout(("Incorrect MAC received on packet")); |
592 | crReturn(0); |
593 | } |
960e736a |
594 | st->incoming_sequence++; /* whether or not we MACed */ |
e5574168 |
595 | |
4ba9b64b |
596 | /* |
597 | * Decompress packet payload. |
598 | */ |
599 | { |
600 | unsigned char *newpayload; |
601 | int newlen; |
602 | if (sccomp && sccomp->decompress(pktin.data+5, pktin.length-5, |
603 | &newpayload, &newlen)) { |
604 | if (pktin.maxlen < newlen+5) { |
605 | pktin.maxlen = newlen+5; |
dcbde236 |
606 | pktin.data = (pktin.data == NULL ? smalloc(pktin.maxlen+APIEXTRA) : |
607 | srealloc(pktin.data, pktin.maxlen+APIEXTRA)); |
4ba9b64b |
608 | if (!pktin.data) |
609 | fatalbox("Out of memory"); |
610 | } |
611 | pktin.length = 5 + newlen; |
612 | memcpy(pktin.data+5, newpayload, newlen); |
613 | #if 0 |
614 | debug(("Post-decompression payload:\r\n")); |
615 | for (st->i = 0; st->i < newlen; st->i++) |
616 | debug((" %02x", (unsigned char)pktin.data[5+st->i])); |
617 | debug(("\r\n")); |
618 | #endif |
619 | |
dcbde236 |
620 | sfree(newpayload); |
4ba9b64b |
621 | } |
622 | } |
623 | |
e5574168 |
624 | pktin.savedpos = 6; |
625 | pktin.type = pktin.data[5]; |
e5574168 |
626 | |
7cca0d81 |
627 | if (pktin.type == SSH2_MSG_IGNORE || pktin.type == SSH2_MSG_DEBUG) |
628 | goto next_packet; /* FIXME: print DEBUG message */ |
e5574168 |
629 | |
630 | crFinish(0); |
631 | } |
632 | |
4ba9b64b |
633 | static void ssh1_pktout_size(int len) { |
374330e2 |
634 | int pad, biglen; |
635 | |
636 | len += 5; /* type and CRC */ |
637 | pad = 8 - (len%8); |
638 | biglen = len + pad; |
639 | |
640 | pktout.length = len-5; |
641 | if (pktout.maxlen < biglen) { |
642 | pktout.maxlen = biglen; |
8f203108 |
643 | #ifdef MSCRYPTOAPI |
fb09bf1c |
644 | /* Allocate enough buffer space for extra block |
8f203108 |
645 | * for MS CryptEncrypt() */ |
dcbde236 |
646 | pktout.data = (pktout.data == NULL ? smalloc(biglen+12) : |
647 | srealloc(pktout.data, biglen+12)); |
8f203108 |
648 | #else |
dcbde236 |
649 | pktout.data = (pktout.data == NULL ? smalloc(biglen+4) : |
650 | srealloc(pktout.data, biglen+4)); |
8f203108 |
651 | #endif |
374330e2 |
652 | if (!pktout.data) |
653 | fatalbox("Out of memory"); |
654 | } |
4ba9b64b |
655 | pktout.body = pktout.data+4+pad+1; |
656 | } |
374330e2 |
657 | |
4ba9b64b |
658 | static void s_wrpkt_start(int type, int len) { |
659 | ssh1_pktout_size(len); |
374330e2 |
660 | pktout.type = type; |
374330e2 |
661 | } |
662 | |
39065bed |
663 | static int s_wrpkt_prepare(void) { |
374330e2 |
664 | int pad, len, biglen, i; |
665 | unsigned long crc; |
666 | |
4ba9b64b |
667 | pktout.body[-1] = pktout.type; |
668 | |
7d503c31 |
669 | #if 0 |
670 | debug(("Packet payload pre-compression:\n")); |
671 | for (i = -1; i < pktout.length; i++) |
672 | debug((" %02x", (unsigned char)pktout.body[i])); |
673 | debug(("\r\n")); |
674 | #endif |
675 | |
4ba9b64b |
676 | if (ssh1_compressing) { |
677 | unsigned char *compblk; |
678 | int complen; |
4ba9b64b |
679 | zlib_compress_block(pktout.body-1, pktout.length+1, |
680 | &compblk, &complen); |
681 | ssh1_pktout_size(complen-1); |
682 | memcpy(pktout.body-1, compblk, complen); |
dcbde236 |
683 | sfree(compblk); |
4ba9b64b |
684 | #if 0 |
685 | debug(("Packet payload post-compression:\n")); |
686 | for (i = -1; i < pktout.length; i++) |
687 | debug((" %02x", (unsigned char)pktout.body[i])); |
688 | debug(("\r\n")); |
689 | #endif |
690 | } |
691 | |
374330e2 |
692 | len = pktout.length + 5; /* type and CRC */ |
693 | pad = 8 - (len%8); |
694 | biglen = len + pad; |
695 | |
374330e2 |
696 | for (i=0; i<pad; i++) |
697 | pktout.data[i+4] = random_byte(); |
698 | crc = crc32(pktout.data+4, biglen-4); |
fb09bf1c |
699 | PUT_32BIT(pktout.data+biglen, crc); |
700 | PUT_32BIT(pktout.data, len); |
374330e2 |
701 | |
698a5108 |
702 | #if 0 |
703 | debug(("Sending packet len=%d\r\n", biglen+4)); |
704 | for (i = 0; i < biglen+4; i++) |
705 | debug((" %02x", (unsigned char)pktout.data[i])); |
706 | debug(("\r\n")); |
707 | #endif |
374330e2 |
708 | if (cipher) |
709 | cipher->encrypt(pktout.data+4, biglen); |
710 | |
39065bed |
711 | return biglen+4; |
712 | } |
713 | |
714 | static void s_wrpkt(void) { |
715 | int len; |
716 | len = s_wrpkt_prepare(); |
717 | sk_write(s, pktout.data, len); |
718 | } |
719 | |
720 | static void s_wrpkt_defer(void) { |
721 | int len; |
722 | len = s_wrpkt_prepare(); |
723 | if (deferred_len + len > deferred_size) { |
724 | deferred_size = deferred_len + len + 128; |
725 | deferred_send_data = srealloc(deferred_send_data, deferred_size); |
726 | } |
727 | memcpy(deferred_send_data+deferred_len, pktout.data, len); |
728 | deferred_len += len; |
374330e2 |
729 | } |
730 | |
fb09bf1c |
731 | /* |
39065bed |
732 | * Construct a packet with the specified contents. |
fb09bf1c |
733 | */ |
39065bed |
734 | static void construct_packet(int pkttype, va_list ap1, va_list ap2) |
fb09bf1c |
735 | { |
fb09bf1c |
736 | unsigned char *p, *argp, argchar; |
737 | unsigned long argint; |
738 | int pktlen, argtype, arglen; |
7cca0d81 |
739 | Bignum bn; |
fb09bf1c |
740 | |
741 | pktlen = 0; |
39065bed |
742 | while ((argtype = va_arg(ap1, int)) != PKT_END) { |
fb09bf1c |
743 | switch (argtype) { |
744 | case PKT_INT: |
39065bed |
745 | (void) va_arg(ap1, int); |
fb09bf1c |
746 | pktlen += 4; |
747 | break; |
748 | case PKT_CHAR: |
39065bed |
749 | (void) va_arg(ap1, char); |
fb09bf1c |
750 | pktlen++; |
751 | break; |
752 | case PKT_DATA: |
39065bed |
753 | (void) va_arg(ap1, unsigned char *); |
754 | arglen = va_arg(ap1, int); |
fb09bf1c |
755 | pktlen += arglen; |
756 | break; |
757 | case PKT_STR: |
39065bed |
758 | argp = va_arg(ap1, unsigned char *); |
fb09bf1c |
759 | arglen = strlen(argp); |
760 | pktlen += 4 + arglen; |
761 | break; |
7cca0d81 |
762 | case PKT_BIGNUM: |
39065bed |
763 | bn = va_arg(ap1, Bignum); |
5c58ad2d |
764 | pktlen += ssh1_bignum_length(bn); |
7cca0d81 |
765 | break; |
fb09bf1c |
766 | default: |
767 | assert(0); |
768 | } |
769 | } |
fb09bf1c |
770 | |
771 | s_wrpkt_start(pkttype, pktlen); |
772 | p = pktout.body; |
773 | |
39065bed |
774 | while ((argtype = va_arg(ap2, int)) != PKT_END) { |
fb09bf1c |
775 | switch (argtype) { |
776 | case PKT_INT: |
39065bed |
777 | argint = va_arg(ap2, int); |
fb09bf1c |
778 | PUT_32BIT(p, argint); |
779 | p += 4; |
780 | break; |
781 | case PKT_CHAR: |
39065bed |
782 | argchar = va_arg(ap2, unsigned char); |
fb09bf1c |
783 | *p = argchar; |
784 | p++; |
785 | break; |
786 | case PKT_DATA: |
39065bed |
787 | argp = va_arg(ap2, unsigned char *); |
788 | arglen = va_arg(ap2, int); |
fb09bf1c |
789 | memcpy(p, argp, arglen); |
790 | p += arglen; |
791 | break; |
792 | case PKT_STR: |
39065bed |
793 | argp = va_arg(ap2, unsigned char *); |
fb09bf1c |
794 | arglen = strlen(argp); |
795 | PUT_32BIT(p, arglen); |
796 | memcpy(p + 4, argp, arglen); |
797 | p += 4 + arglen; |
798 | break; |
7cca0d81 |
799 | case PKT_BIGNUM: |
39065bed |
800 | bn = va_arg(ap2, Bignum); |
5c58ad2d |
801 | p += ssh1_write_bignum(p, bn); |
7cca0d81 |
802 | break; |
fb09bf1c |
803 | } |
804 | } |
39065bed |
805 | } |
fb09bf1c |
806 | |
39065bed |
807 | static void send_packet(int pkttype, ...) { |
808 | va_list ap1, ap2; |
809 | va_start(ap1, pkttype); |
810 | va_start(ap2, pkttype); |
811 | construct_packet(pkttype, ap1, ap2); |
fb09bf1c |
812 | s_wrpkt(); |
813 | } |
814 | |
39065bed |
815 | static void defer_packet(int pkttype, ...) { |
816 | va_list ap1, ap2; |
817 | va_start(ap1, pkttype); |
818 | va_start(ap2, pkttype); |
819 | construct_packet(pkttype, ap1, ap2); |
820 | s_wrpkt_defer(); |
821 | } |
822 | |
9697bfd2 |
823 | static int ssh_versioncmp(char *a, char *b) { |
824 | char *ae, *be; |
825 | unsigned long av, bv; |
826 | |
43aa02a7 |
827 | av = strtoul(a, &ae, 10); |
828 | bv = strtoul(b, &be, 10); |
9697bfd2 |
829 | if (av != bv) return (av < bv ? -1 : +1); |
830 | if (*ae == '.') ae++; |
831 | if (*be == '.') be++; |
43aa02a7 |
832 | av = strtoul(ae, &ae, 10); |
833 | bv = strtoul(be, &be, 10); |
9697bfd2 |
834 | if (av != bv) return (av < bv ? -1 : +1); |
835 | return 0; |
836 | } |
837 | |
e5574168 |
838 | |
839 | /* |
a92dd380 |
840 | * Utility routines for putting an SSH-protocol `string' and |
841 | * `uint32' into a SHA state. |
e5574168 |
842 | */ |
843 | #include <stdio.h> |
75cab814 |
844 | static void sha_string(SHA_State *s, void *str, int len) { |
e5574168 |
845 | unsigned char lenblk[4]; |
e5574168 |
846 | PUT_32BIT(lenblk, len); |
e5574168 |
847 | SHA_Bytes(s, lenblk, 4); |
e5574168 |
848 | SHA_Bytes(s, str, len); |
849 | } |
850 | |
a92dd380 |
851 | static void sha_uint32(SHA_State *s, unsigned i) { |
852 | unsigned char intblk[4]; |
853 | PUT_32BIT(intblk, i); |
854 | SHA_Bytes(s, intblk, 4); |
855 | } |
856 | |
7cca0d81 |
857 | /* |
858 | * SSH2 packet construction functions. |
859 | */ |
783415f8 |
860 | static void ssh2_pkt_ensure(int length) { |
861 | if (pktout.maxlen < length) { |
862 | pktout.maxlen = length + 256; |
dcbde236 |
863 | pktout.data = (pktout.data == NULL ? smalloc(pktout.maxlen+APIEXTRA) : |
864 | srealloc(pktout.data, pktout.maxlen+APIEXTRA)); |
7cca0d81 |
865 | if (!pktout.data) |
866 | fatalbox("Out of memory"); |
867 | } |
783415f8 |
868 | } |
869 | static void ssh2_pkt_adddata(void *data, int len) { |
870 | pktout.length += len; |
871 | ssh2_pkt_ensure(pktout.length); |
7cca0d81 |
872 | memcpy(pktout.data+pktout.length-len, data, len); |
873 | } |
75cab814 |
874 | static void ssh2_pkt_addbyte(unsigned char byte) { |
7cca0d81 |
875 | ssh2_pkt_adddata(&byte, 1); |
876 | } |
75cab814 |
877 | static void ssh2_pkt_init(int pkt_type) { |
7cca0d81 |
878 | pktout.length = 5; |
879 | ssh2_pkt_addbyte((unsigned char)pkt_type); |
880 | } |
75cab814 |
881 | static void ssh2_pkt_addbool(unsigned char value) { |
7cca0d81 |
882 | ssh2_pkt_adddata(&value, 1); |
883 | } |
75cab814 |
884 | static void ssh2_pkt_adduint32(unsigned long value) { |
7cca0d81 |
885 | unsigned char x[4]; |
886 | PUT_32BIT(x, value); |
887 | ssh2_pkt_adddata(x, 4); |
888 | } |
75cab814 |
889 | static void ssh2_pkt_addstring_start(void) { |
7cca0d81 |
890 | ssh2_pkt_adduint32(0); |
891 | pktout.savedpos = pktout.length; |
892 | } |
75cab814 |
893 | static void ssh2_pkt_addstring_str(char *data) { |
7cca0d81 |
894 | ssh2_pkt_adddata(data, strlen(data)); |
895 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
896 | pktout.length - pktout.savedpos); |
897 | } |
75cab814 |
898 | static void ssh2_pkt_addstring_data(char *data, int len) { |
7cca0d81 |
899 | ssh2_pkt_adddata(data, len); |
900 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
901 | pktout.length - pktout.savedpos); |
902 | } |
75cab814 |
903 | static void ssh2_pkt_addstring(char *data) { |
7cca0d81 |
904 | ssh2_pkt_addstring_start(); |
905 | ssh2_pkt_addstring_str(data); |
906 | } |
75cab814 |
907 | static char *ssh2_mpint_fmt(Bignum b, int *len) { |
7cca0d81 |
908 | unsigned char *p; |
3709bfe9 |
909 | int i, n = (ssh1_bignum_bitcount(b)+7)/8; |
910 | p = smalloc(n + 1); |
7cca0d81 |
911 | if (!p) |
912 | fatalbox("out of memory"); |
913 | p[0] = 0; |
3709bfe9 |
914 | for (i = 1; i <= n; i++) |
915 | p[i] = bignum_byte(b, n-i); |
7cca0d81 |
916 | i = 0; |
3709bfe9 |
917 | while (i <= n && p[i] == 0 && (p[i+1] & 0x80) == 0) |
7cca0d81 |
918 | i++; |
3709bfe9 |
919 | memmove(p, p+i, n+1-i); |
920 | *len = n+1-i; |
7cca0d81 |
921 | return p; |
922 | } |
75cab814 |
923 | static void ssh2_pkt_addmp(Bignum b) { |
7cca0d81 |
924 | unsigned char *p; |
925 | int len; |
926 | p = ssh2_mpint_fmt(b, &len); |
927 | ssh2_pkt_addstring_start(); |
928 | ssh2_pkt_addstring_data(p, len); |
dcbde236 |
929 | sfree(p); |
7cca0d81 |
930 | } |
b185170a |
931 | |
932 | /* |
933 | * Construct an SSH2 final-form packet: compress it, encrypt it, |
934 | * put the MAC on it. Final packet, ready to be sent, is stored in |
935 | * pktout.data. Total length is returned. |
936 | */ |
937 | static int ssh2_pkt_construct(void) { |
7cca0d81 |
938 | int cipherblk, maclen, padding, i; |
939 | static unsigned long outgoing_sequence = 0; |
940 | |
941 | /* |
4ba9b64b |
942 | * Compress packet payload. |
943 | */ |
944 | #if 0 |
945 | debug(("Pre-compression payload:\r\n")); |
946 | for (i = 5; i < pktout.length; i++) |
947 | debug((" %02x", (unsigned char)pktout.data[i])); |
948 | debug(("\r\n")); |
949 | #endif |
950 | { |
951 | unsigned char *newpayload; |
952 | int newlen; |
953 | if (cscomp && cscomp->compress(pktout.data+5, pktout.length-5, |
954 | &newpayload, &newlen)) { |
955 | pktout.length = 5; |
956 | ssh2_pkt_adddata(newpayload, newlen); |
dcbde236 |
957 | sfree(newpayload); |
4ba9b64b |
958 | } |
959 | } |
960 | |
961 | /* |
7cca0d81 |
962 | * Add padding. At least four bytes, and must also bring total |
963 | * length (minus MAC) up to a multiple of the block size. |
964 | */ |
8479e33c |
965 | cipherblk = cscipher ? cscipher->blksize : 8; /* block size */ |
7cca0d81 |
966 | cipherblk = cipherblk < 8 ? 8 : cipherblk; /* or 8 if blksize < 8 */ |
967 | padding = 4; |
968 | padding += (cipherblk - (pktout.length + padding) % cipherblk) % cipherblk; |
783415f8 |
969 | maclen = csmac ? csmac->len : 0; |
970 | ssh2_pkt_ensure(pktout.length + padding + maclen); |
7cca0d81 |
971 | pktout.data[4] = padding; |
972 | for (i = 0; i < padding; i++) |
973 | pktout.data[pktout.length + i] = random_byte(); |
974 | PUT_32BIT(pktout.data, pktout.length + padding - 4); |
975 | if (csmac) |
976 | csmac->generate(pktout.data, pktout.length + padding, |
977 | outgoing_sequence); |
978 | outgoing_sequence++; /* whether or not we MACed */ |
979 | |
980 | #if 0 |
981 | debug(("Sending packet len=%d\r\n", pktout.length+padding)); |
982 | for (i = 0; i < pktout.length+padding; i++) |
983 | debug((" %02x", (unsigned char)pktout.data[i])); |
984 | debug(("\r\n")); |
985 | #endif |
986 | |
987 | if (cscipher) |
988 | cscipher->encrypt(pktout.data, pktout.length + padding); |
7cca0d81 |
989 | |
b185170a |
990 | /* Ready-to-send packet starts at pktout.data. We return length. */ |
991 | return pktout.length + padding + maclen; |
992 | } |
993 | |
994 | /* |
995 | * Construct and send an SSH2 packet immediately. |
996 | */ |
997 | static void ssh2_pkt_send(void) { |
998 | int len = ssh2_pkt_construct(); |
999 | sk_write(s, pktout.data, len); |
1000 | } |
1001 | |
1002 | /* |
1003 | * Construct an SSH2 packet and add it to a deferred data block. |
1004 | * Useful for sending multiple packets in a single sk_write() call, |
1005 | * to prevent a traffic-analysing listener from being able to work |
1006 | * out the length of any particular packet (such as the password |
1007 | * packet). |
1008 | * |
1009 | * Note that because SSH2 sequence-numbers its packets, this can |
1010 | * NOT be used as an m4-style `defer' allowing packets to be |
1011 | * constructed in one order and sent in another. |
1012 | */ |
1013 | static void ssh2_pkt_defer(void) { |
1014 | int len = ssh2_pkt_construct(); |
1015 | if (deferred_len + len > deferred_size) { |
1016 | deferred_size = deferred_len + len + 128; |
1017 | deferred_send_data = srealloc(deferred_send_data, deferred_size); |
1018 | } |
1019 | memcpy(deferred_send_data+deferred_len, pktout.data, len); |
1020 | deferred_len += len; |
1021 | } |
1022 | |
1023 | /* |
1024 | * Send the whole deferred data block constructed by |
39065bed |
1025 | * ssh2_pkt_defer() or SSH1's defer_packet(). |
b185170a |
1026 | */ |
39065bed |
1027 | static void ssh_pkt_defersend(void) { |
b185170a |
1028 | sk_write(s, deferred_send_data, deferred_len); |
1029 | deferred_len = deferred_size = 0; |
1030 | sfree(deferred_send_data); |
1031 | deferred_send_data = NULL; |
7cca0d81 |
1032 | } |
1033 | |
1034 | #if 0 |
1035 | void bndebug(char *string, Bignum b) { |
1036 | unsigned char *p; |
1037 | int i, len; |
1038 | p = ssh2_mpint_fmt(b, &len); |
1039 | debug(("%s", string)); |
1040 | for (i = 0; i < len; i++) |
1041 | debug((" %02x", p[i])); |
1042 | debug(("\r\n")); |
dcbde236 |
1043 | sfree(p); |
7cca0d81 |
1044 | } |
1045 | #endif |
1046 | |
75cab814 |
1047 | static void sha_mpint(SHA_State *s, Bignum b) { |
7cca0d81 |
1048 | unsigned char *p; |
1049 | int len; |
1050 | p = ssh2_mpint_fmt(b, &len); |
1051 | sha_string(s, p, len); |
dcbde236 |
1052 | sfree(p); |
7cca0d81 |
1053 | } |
1054 | |
1055 | /* |
1056 | * SSH2 packet decode functions. |
1057 | */ |
75cab814 |
1058 | static unsigned long ssh2_pkt_getuint32(void) { |
7cca0d81 |
1059 | unsigned long value; |
1060 | if (pktin.length - pktin.savedpos < 4) |
1061 | return 0; /* arrgh, no way to decline (FIXME?) */ |
1062 | value = GET_32BIT(pktin.data+pktin.savedpos); |
1063 | pktin.savedpos += 4; |
1064 | return value; |
1065 | } |
65a22376 |
1066 | static int ssh2_pkt_getbool(void) { |
1067 | unsigned long value; |
1068 | if (pktin.length - pktin.savedpos < 1) |
1069 | return 0; /* arrgh, no way to decline (FIXME?) */ |
1070 | value = pktin.data[pktin.savedpos] != 0; |
1071 | pktin.savedpos++; |
1072 | return value; |
1073 | } |
75cab814 |
1074 | static void ssh2_pkt_getstring(char **p, int *length) { |
7cca0d81 |
1075 | *p = NULL; |
1076 | if (pktin.length - pktin.savedpos < 4) |
1077 | return; |
1078 | *length = GET_32BIT(pktin.data+pktin.savedpos); |
1079 | pktin.savedpos += 4; |
1080 | if (pktin.length - pktin.savedpos < *length) |
1081 | return; |
1082 | *p = pktin.data+pktin.savedpos; |
1083 | pktin.savedpos += *length; |
1084 | } |
75cab814 |
1085 | static Bignum ssh2_pkt_getmp(void) { |
7cca0d81 |
1086 | char *p; |
3709bfe9 |
1087 | int length; |
7cca0d81 |
1088 | Bignum b; |
1089 | |
1090 | ssh2_pkt_getstring(&p, &length); |
1091 | if (!p) |
1092 | return NULL; |
8d5de777 |
1093 | if (p[0] & 0x80) { |
1094 | bombout(("internal error: Can't handle negative mpints")); |
1095 | return NULL; |
1096 | } |
3709bfe9 |
1097 | b = bignum_from_bytes(p, length); |
7cca0d81 |
1098 | return b; |
1099 | } |
1100 | |
7d503c31 |
1101 | /* |
1102 | * Examine the remote side's version string and compare it against |
1103 | * a list of known buggy implementations. |
1104 | */ |
1105 | static void ssh_detect_bugs(char *vstring) { |
1106 | char *imp; /* pointer to implementation part */ |
1107 | imp = vstring; |
1108 | imp += strcspn(imp, "-"); |
1109 | imp += strcspn(imp, "-"); |
1110 | |
1111 | ssh_remote_bugs = 0; |
1112 | |
1113 | if (!strcmp(imp, "1.2.18") || !strcmp(imp, "1.2.19") || |
1114 | !strcmp(imp, "1.2.20") || !strcmp(imp, "1.2.21") || |
1115 | !strcmp(imp, "1.2.22")) { |
1116 | /* |
1117 | * These versions don't support SSH1_MSG_IGNORE, so we have |
1118 | * to use a different defence against password length |
1119 | * sniffing. |
1120 | */ |
1121 | ssh_remote_bugs |= BUG_CHOKES_ON_SSH1_IGNORE; |
1122 | logevent("We believe remote version has SSH1 ignore bug"); |
1123 | } |
1124 | |
1125 | if (!strncmp(imp, "2.1.0", 5) || !strncmp(imp, "2.0.", 4) || |
1126 | !strncmp(imp, "2.2.0", 5) || !strncmp(imp, "2.3.0", 5) || |
1127 | !strncmp(imp, "2.1 ", 4)) { |
1128 | /* |
1129 | * These versions have the HMAC bug. |
1130 | */ |
1131 | ssh_remote_bugs |= BUG_SSH2_HMAC; |
1132 | logevent("We believe remote version has SSH2 HMAC bug"); |
1133 | } |
1134 | } |
1135 | |
8df7a775 |
1136 | static int do_ssh_init(unsigned char c) { |
1137 | static char *vsp; |
1138 | static char version[10]; |
1139 | static char vstring[80]; |
1140 | static char vlog[sizeof(vstring)+20]; |
1141 | static int i; |
374330e2 |
1142 | |
8df7a775 |
1143 | crBegin; |
1144 | |
1145 | /* Search for the string "SSH-" in the input. */ |
374330e2 |
1146 | i = 0; |
8df7a775 |
1147 | while (1) { |
1148 | static const int transS[] = { 1, 2, 2, 1 }; |
1149 | static const int transH[] = { 0, 0, 3, 0 }; |
1150 | static const int transminus[] = { 0, 0, 0, -1 }; |
1151 | if (c == 'S') i = transS[i]; |
1152 | else if (c == 'H') i = transH[i]; |
1153 | else if (c == '-') i = transminus[i]; |
374330e2 |
1154 | else i = 0; |
8df7a775 |
1155 | if (i < 0) |
1156 | break; |
1157 | crReturn(1); /* get another character */ |
374330e2 |
1158 | } |
8df7a775 |
1159 | |
c5e9c988 |
1160 | strcpy(vstring, "SSH-"); |
1161 | vsp = vstring+4; |
374330e2 |
1162 | i = 0; |
1163 | while (1) { |
8df7a775 |
1164 | crReturn(1); /* get another char */ |
c5e9c988 |
1165 | if (vsp < vstring+sizeof(vstring)-1) |
1166 | *vsp++ = c; |
374330e2 |
1167 | if (i >= 0) { |
1168 | if (c == '-') { |
1169 | version[i] = '\0'; |
1170 | i = -1; |
1171 | } else if (i < sizeof(version)-1) |
1172 | version[i++] = c; |
1173 | } |
1174 | else if (c == '\n') |
1175 | break; |
1176 | } |
1177 | |
db7d555c |
1178 | ssh_agentfwd_enabled = FALSE; |
960e736a |
1179 | rdpkt2_state.incoming_sequence = 0; |
1180 | |
c5e9c988 |
1181 | *vsp = 0; |
1182 | sprintf(vlog, "Server version: %s", vstring); |
7d503c31 |
1183 | ssh_detect_bugs(vstring); |
c5e9c988 |
1184 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1185 | logevent(vlog); |
1186 | |
adf799dd |
1187 | /* |
1188 | * Server version "1.99" means we can choose whether we use v1 |
1189 | * or v2 protocol. Choice is based on cfg.sshprot. |
1190 | */ |
1191 | if (ssh_versioncmp(version, cfg.sshprot == 1 ? "2.0" : "1.99") >= 0) { |
e5574168 |
1192 | /* |
1193 | * This is a v2 server. Begin v2 protocol. |
1194 | */ |
1195 | char *verstring = "SSH-2.0-PuTTY"; |
0db56f73 |
1196 | SHA_Init(&exhashbase); |
e5574168 |
1197 | /* |
1198 | * Hash our version string and their version string. |
1199 | */ |
0db56f73 |
1200 | sha_string(&exhashbase, verstring, strlen(verstring)); |
1201 | sha_string(&exhashbase, vstring, strcspn(vstring, "\r\n")); |
e5574168 |
1202 | sprintf(vstring, "%s\n", verstring); |
1203 | sprintf(vlog, "We claim version: %s", verstring); |
1204 | logevent(vlog); |
1205 | logevent("Using SSH protocol version 2"); |
8df7a775 |
1206 | sk_write(s, vstring, strlen(vstring)); |
e5574168 |
1207 | ssh_protocol = ssh2_protocol; |
6abbf9e3 |
1208 | ssh_version = 2; |
e5574168 |
1209 | s_rdpkt = ssh2_rdpkt; |
1210 | } else { |
1211 | /* |
1212 | * This is a v1 server. Begin v1 protocol. |
1213 | */ |
1214 | sprintf(vstring, "SSH-%s-PuTTY\n", |
1215 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5")); |
1216 | sprintf(vlog, "We claim version: %s", vstring); |
1217 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1218 | logevent(vlog); |
1219 | logevent("Using SSH protocol version 1"); |
8df7a775 |
1220 | sk_write(s, vstring, strlen(vstring)); |
e5574168 |
1221 | ssh_protocol = ssh1_protocol; |
6abbf9e3 |
1222 | ssh_version = 1; |
e5574168 |
1223 | s_rdpkt = ssh1_rdpkt; |
1224 | } |
3687d221 |
1225 | ssh_state = SSH_STATE_BEFORE_SIZE; |
8df7a775 |
1226 | |
1227 | crFinish(0); |
1228 | } |
1229 | |
1230 | static void ssh_gotdata(unsigned char *data, int datalen) |
1231 | { |
1232 | crBegin; |
1233 | |
1234 | /* |
1235 | * To begin with, feed the characters one by one to the |
1236 | * protocol initialisation / selection function do_ssh_init(). |
1237 | * When that returns 0, we're done with the initial greeting |
1238 | * exchange and can move on to packet discipline. |
1239 | */ |
1240 | while (1) { |
1241 | int ret; |
1242 | if (datalen == 0) |
1243 | crReturnV; /* more data please */ |
1244 | ret = do_ssh_init(*data); |
1245 | data++; datalen--; |
1246 | if (ret == 0) |
1247 | break; |
1248 | } |
1249 | |
1250 | /* |
1251 | * We emerge from that loop when the initial negotiation is |
1252 | * over and we have selected an s_rdpkt function. Now pass |
1253 | * everything to s_rdpkt, and then pass the resulting packets |
1254 | * to the proper protocol handler. |
1255 | */ |
1256 | if (datalen == 0) |
1257 | crReturnV; |
1258 | while (1) { |
1259 | while (datalen > 0) { |
1260 | if ( s_rdpkt(&data, &datalen) == 0 ) { |
1261 | ssh_protocol(NULL, 0, 1); |
1262 | if (ssh_state == SSH_STATE_CLOSED) { |
1263 | return; |
1264 | } |
1265 | } |
1266 | } |
1267 | crReturnV; |
1268 | } |
1269 | crFinishV; |
1270 | } |
1271 | |
340cf649 |
1272 | static int ssh_receive(Socket skt, int urgent, char *data, int len) { |
2c94fd1c |
1273 | if (urgent==3) { |
1274 | /* A socket error has occurred. */ |
7dbb9f56 |
1275 | ssh_state = SSH_STATE_CLOSED; |
b47b2198 |
1276 | sk_close(s); |
7dbb9f56 |
1277 | s = NULL; |
2c94fd1c |
1278 | connection_fatal(data); |
b47b2198 |
1279 | return 0; |
1280 | } else if (!len) { |
8df7a775 |
1281 | /* Connection has closed. */ |
6abb6cd7 |
1282 | ssh_state = SSH_STATE_CLOSED; |
8df7a775 |
1283 | sk_close(s); |
1284 | s = NULL; |
1285 | return 0; |
1286 | } |
1287 | ssh_gotdata (data, len); |
3257deae |
1288 | if (ssh_state == SSH_STATE_CLOSED) { |
1289 | if (s) { |
1290 | sk_close(s); |
1291 | s = NULL; |
1292 | } |
1293 | return 0; |
1294 | } |
fef97f43 |
1295 | return 1; |
374330e2 |
1296 | } |
1297 | |
fb09bf1c |
1298 | /* |
8df7a775 |
1299 | * Connect to specified host and port. |
1300 | * Returns an error message, or NULL on success. |
1301 | * Also places the canonical host name into `realhost'. |
1302 | */ |
1303 | static char *connect_to_host(char *host, int port, char **realhost) |
1304 | { |
1305 | SockAddr addr; |
1306 | char *err; |
1307 | #ifdef FWHACK |
1308 | char *FWhost; |
1309 | int FWport; |
1310 | #endif |
1311 | |
dcbde236 |
1312 | savedhost = smalloc(1+strlen(host)); |
8df7a775 |
1313 | if (!savedhost) |
1314 | fatalbox("Out of memory"); |
1315 | strcpy(savedhost, host); |
1316 | |
1317 | if (port < 0) |
1318 | port = 22; /* default ssh port */ |
1319 | savedport = port; |
1320 | |
1321 | #ifdef FWHACK |
1322 | FWhost = host; |
1323 | FWport = port; |
1324 | host = FWSTR; |
1325 | port = 23; |
1326 | #endif |
1327 | |
1328 | /* |
1329 | * Try to find host. |
1330 | */ |
1331 | addr = sk_namelookup(host, realhost); |
1332 | if ( (err = sk_addr_error(addr)) ) |
1333 | return err; |
1334 | |
1335 | #ifdef FWHACK |
1336 | *realhost = FWhost; |
1337 | #endif |
1338 | |
1339 | /* |
1340 | * Open socket. |
1341 | */ |
4b1e8acc |
1342 | s = sk_new(addr, port, 0, 1, ssh_receive); |
8df7a775 |
1343 | if ( (err = sk_socket_error(s)) ) |
1344 | return err; |
1345 | |
1346 | #ifdef FWHACK |
1347 | sk_write(s, "connect ", 8); |
1348 | sk_write(s, FWhost, strlen(FWhost)); |
1349 | { |
1350 | char buf[20]; |
1351 | sprintf(buf, " %d\n", FWport); |
1352 | sk_write(s, buf, strlen(buf)); |
1353 | } |
1354 | #endif |
1355 | |
1356 | return NULL; |
1357 | } |
1358 | |
1359 | /* |
fb09bf1c |
1360 | * Handle the key exchange and user authentication phases. |
1361 | */ |
e5574168 |
1362 | static int do_ssh1_login(unsigned char *in, int inlen, int ispkt) |
fb09bf1c |
1363 | { |
374330e2 |
1364 | int i, j, len; |
374330e2 |
1365 | unsigned char *rsabuf, *keystr1, *keystr2; |
1366 | unsigned char cookie[8]; |
1367 | struct RSAKey servkey, hostkey; |
1368 | struct MD5Context md5c; |
ccbfb941 |
1369 | static unsigned long supported_ciphers_mask, supported_auths_mask; |
7cca0d81 |
1370 | static int tried_publickey; |
1371 | static unsigned char session_id[16]; |
bea1ef5f |
1372 | int cipher_type; |
b585ec46 |
1373 | static char username[100]; |
374330e2 |
1374 | |
374330e2 |
1375 | crBegin; |
1376 | |
fb09bf1c |
1377 | if (!ispkt) crWaitUntil(ispkt); |
374330e2 |
1378 | |
8d5de777 |
1379 | if (pktin.type != SSH1_SMSG_PUBLIC_KEY) { |
1380 | bombout(("Public key packet not received")); |
1381 | crReturn(0); |
1382 | } |
374330e2 |
1383 | |
c5e9c988 |
1384 | logevent("Received public keys"); |
374330e2 |
1385 | |
c5e9c988 |
1386 | memcpy(cookie, pktin.body, 8); |
374330e2 |
1387 | |
7cca0d81 |
1388 | i = makekey(pktin.body+8, &servkey, &keystr1, 0); |
1389 | j = makekey(pktin.body+8+i, &hostkey, &keystr2, 0); |
374330e2 |
1390 | |
c5e9c988 |
1391 | /* |
1c2a93c4 |
1392 | * Log the host key fingerprint. |
c5e9c988 |
1393 | */ |
c5e9c988 |
1394 | { |
1395 | char logmsg[80]; |
1c2a93c4 |
1396 | logevent("Host key fingerprint is:"); |
c5e9c988 |
1397 | strcpy(logmsg, " "); |
1c2a93c4 |
1398 | hostkey.comment = NULL; |
1399 | rsa_fingerprint(logmsg+strlen(logmsg), sizeof(logmsg)-strlen(logmsg), |
1400 | &hostkey); |
c5e9c988 |
1401 | logevent(logmsg); |
1402 | } |
1403 | |
fb09bf1c |
1404 | supported_ciphers_mask = GET_32BIT(pktin.body+12+i+j); |
1405 | supported_auths_mask = GET_32BIT(pktin.body+16+i+j); |
bea1ef5f |
1406 | |
c5e9c988 |
1407 | MD5Init(&md5c); |
374330e2 |
1408 | MD5Update(&md5c, keystr2, hostkey.bytes); |
1409 | MD5Update(&md5c, keystr1, servkey.bytes); |
1410 | MD5Update(&md5c, pktin.body, 8); |
374330e2 |
1411 | MD5Final(session_id, &md5c); |
1412 | |
1413 | for (i=0; i<32; i++) |
1414 | session_key[i] = random_byte(); |
1415 | |
1416 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
1417 | |
dcbde236 |
1418 | rsabuf = smalloc(len); |
374330e2 |
1419 | if (!rsabuf) |
1420 | fatalbox("Out of memory"); |
1421 | |
89ee5268 |
1422 | /* |
1423 | * Verify the host key. |
1424 | */ |
1425 | { |
1426 | /* |
1427 | * First format the key into a string. |
1428 | */ |
1429 | int len = rsastr_len(&hostkey); |
d5859615 |
1430 | char fingerprint[100]; |
dcbde236 |
1431 | char *keystr = smalloc(len); |
89ee5268 |
1432 | if (!keystr) |
1433 | fatalbox("Out of memory"); |
1434 | rsastr_fmt(keystr, &hostkey); |
d5859615 |
1435 | rsa_fingerprint(fingerprint, sizeof(fingerprint), &hostkey); |
d4857987 |
1436 | verify_ssh_host_key(savedhost, savedport, "rsa", keystr, fingerprint); |
dcbde236 |
1437 | sfree(keystr); |
89ee5268 |
1438 | } |
374330e2 |
1439 | |
1440 | for (i=0; i<32; i++) { |
1441 | rsabuf[i] = session_key[i]; |
1442 | if (i < 16) |
1443 | rsabuf[i] ^= session_id[i]; |
1444 | } |
1445 | |
1446 | if (hostkey.bytes > servkey.bytes) { |
1447 | rsaencrypt(rsabuf, 32, &servkey); |
1448 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
1449 | } else { |
1450 | rsaencrypt(rsabuf, 32, &hostkey); |
1451 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
1452 | } |
1453 | |
c5e9c988 |
1454 | logevent("Encrypted session key"); |
1455 | |
0a3f1d48 |
1456 | switch (cfg.cipher) { |
1457 | case CIPHER_BLOWFISH: cipher_type = SSH_CIPHER_BLOWFISH; break; |
1458 | case CIPHER_DES: cipher_type = SSH_CIPHER_DES; break; |
1459 | case CIPHER_3DES: cipher_type = SSH_CIPHER_3DES; break; |
1460 | case CIPHER_AES: |
1408a877 |
1461 | c_write_str("AES not supported in SSH1, falling back to 3DES\r\n"); |
0a3f1d48 |
1462 | cipher_type = SSH_CIPHER_3DES; |
1463 | break; |
1464 | } |
bea1ef5f |
1465 | if ((supported_ciphers_mask & (1 << cipher_type)) == 0) { |
1408a877 |
1466 | c_write_str("Selected cipher not supported, falling back to 3DES\r\n"); |
bea1ef5f |
1467 | cipher_type = SSH_CIPHER_3DES; |
1468 | } |
c5e9c988 |
1469 | switch (cipher_type) { |
1470 | case SSH_CIPHER_3DES: logevent("Using 3DES encryption"); break; |
1471 | case SSH_CIPHER_DES: logevent("Using single-DES encryption"); break; |
1472 | case SSH_CIPHER_BLOWFISH: logevent("Using Blowfish encryption"); break; |
1473 | } |
bea1ef5f |
1474 | |
e5574168 |
1475 | send_packet(SSH1_CMSG_SESSION_KEY, |
fb09bf1c |
1476 | PKT_CHAR, cipher_type, |
1477 | PKT_DATA, cookie, 8, |
1478 | PKT_CHAR, (len*8) >> 8, PKT_CHAR, (len*8) & 0xFF, |
1479 | PKT_DATA, rsabuf, len, |
1480 | PKT_INT, 0, |
1481 | PKT_END); |
1482 | |
c5e9c988 |
1483 | logevent("Trying to enable encryption..."); |
374330e2 |
1484 | |
dcbde236 |
1485 | sfree(rsabuf); |
374330e2 |
1486 | |
5e8358ad |
1487 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish_ssh1 : |
9697bfd2 |
1488 | cipher_type == SSH_CIPHER_DES ? &ssh_des : |
bea1ef5f |
1489 | &ssh_3des; |
374330e2 |
1490 | cipher->sesskey(session_key); |
1491 | |
fb09bf1c |
1492 | crWaitUntil(ispkt); |
374330e2 |
1493 | |
8d5de777 |
1494 | if (pktin.type != SSH1_SMSG_SUCCESS) { |
1495 | bombout(("Encryption not successfully enabled")); |
1496 | crReturn(0); |
1497 | } |
374330e2 |
1498 | |
c5e9c988 |
1499 | logevent("Successfully started encryption"); |
1500 | |
374330e2 |
1501 | fflush(stdout); |
1502 | { |
374330e2 |
1503 | static int pos = 0; |
1504 | static char c; |
67779be7 |
1505 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
1408a877 |
1506 | c_write_str("login as: "); |
67779be7 |
1507 | ssh_send_ok = 1; |
374330e2 |
1508 | while (pos >= 0) { |
fb09bf1c |
1509 | crWaitUntil(!ispkt); |
374330e2 |
1510 | while (inlen--) switch (c = *in++) { |
1511 | case 10: case 13: |
1512 | username[pos] = 0; |
1513 | pos = -1; |
1514 | break; |
1515 | case 8: case 127: |
1516 | if (pos > 0) { |
1408a877 |
1517 | c_write_str("\b \b"); |
374330e2 |
1518 | pos--; |
1519 | } |
1520 | break; |
1521 | case 21: case 27: |
1522 | while (pos > 0) { |
1408a877 |
1523 | c_write_str("\b \b"); |
374330e2 |
1524 | pos--; |
1525 | } |
1526 | break; |
1527 | case 3: case 4: |
1528 | random_save_seed(); |
1529 | exit(0); |
1530 | break; |
1531 | default: |
40d24aa6 |
1532 | if (((c >= ' ' && c <= '~') || |
1533 | ((unsigned char)c >= 160)) && pos < 40) { |
374330e2 |
1534 | username[pos++] = c; |
1535 | c_write(&c, 1); |
1536 | } |
1537 | break; |
1538 | } |
1539 | } |
1408a877 |
1540 | c_write_str("\r\n"); |
374330e2 |
1541 | username[strcspn(username, "\n\r")] = '\0'; |
1542 | } else { |
374330e2 |
1543 | strncpy(username, cfg.username, 99); |
1544 | username[99] = '\0'; |
374330e2 |
1545 | } |
fb09bf1c |
1546 | |
e5574168 |
1547 | send_packet(SSH1_CMSG_USER, PKT_STR, username, PKT_END); |
c5e9c988 |
1548 | { |
3c8e959b |
1549 | char userlog[22+sizeof(username)]; |
c5e9c988 |
1550 | sprintf(userlog, "Sent username \"%s\"", username); |
1551 | logevent(userlog); |
3c8e959b |
1552 | if (flags & FLAG_INTERACTIVE && |
1553 | (!((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)))) { |
1554 | strcat(userlog, "\r\n"); |
1408a877 |
1555 | c_write_str(userlog); |
3c8e959b |
1556 | } |
c5e9c988 |
1557 | } |
374330e2 |
1558 | } |
1559 | |
fb09bf1c |
1560 | crWaitUntil(ispkt); |
374330e2 |
1561 | |
7cca0d81 |
1562 | tried_publickey = 0; |
1563 | |
e5574168 |
1564 | while (pktin.type == SSH1_SMSG_FAILURE) { |
374330e2 |
1565 | static char password[100]; |
a52f067e |
1566 | static char prompt[200]; |
374330e2 |
1567 | static int pos; |
1568 | static char c; |
ccbfb941 |
1569 | static int pwpkt_type; |
ccbfb941 |
1570 | /* |
1571 | * Show password prompt, having first obtained it via a TIS |
18515c51 |
1572 | * or CryptoCard exchange if we're doing TIS or CryptoCard |
1573 | * authentication. |
ccbfb941 |
1574 | */ |
e5574168 |
1575 | pwpkt_type = SSH1_CMSG_AUTH_PASSWORD; |
5c58ad2d |
1576 | if (agent_exists()) { |
1577 | /* |
1578 | * Attempt RSA authentication using Pageant. |
1579 | */ |
1580 | static unsigned char request[5], *response, *p; |
1581 | static int responselen; |
1582 | static int i, nkeys; |
1583 | static int authed = FALSE; |
1584 | void *r; |
1585 | |
1586 | logevent("Pageant is running. Requesting keys."); |
1587 | |
1588 | /* Request the keys held by the agent. */ |
1589 | PUT_32BIT(request, 1); |
1983e559 |
1590 | request[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES; |
5c58ad2d |
1591 | agent_query(request, 5, &r, &responselen); |
1592 | response = (unsigned char *)r; |
1593 | if (response) { |
1594 | p = response + 5; |
1595 | nkeys = GET_32BIT(p); p += 4; |
6328ea7a |
1596 | { char buf[64]; sprintf(buf, "Pageant has %d SSH1 keys", nkeys); |
5c58ad2d |
1597 | logevent(buf); } |
1598 | for (i = 0; i < nkeys; i++) { |
1599 | static struct RSAKey key; |
1600 | static Bignum challenge; |
b8bb811a |
1601 | static char *commentp; |
1602 | static int commentlen; |
5c58ad2d |
1603 | |
1604 | { char buf[64]; sprintf(buf, "Trying Pageant key #%d", i); |
1605 | logevent(buf); } |
1606 | p += 4; |
1607 | p += ssh1_read_bignum(p, &key.exponent); |
1608 | p += ssh1_read_bignum(p, &key.modulus); |
b8bb811a |
1609 | commentlen = GET_32BIT(p); p += 4; |
1610 | commentp = p; p += commentlen; |
5c58ad2d |
1611 | send_packet(SSH1_CMSG_AUTH_RSA, |
1612 | PKT_BIGNUM, key.modulus, PKT_END); |
1613 | crWaitUntil(ispkt); |
1614 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1615 | logevent("Key refused"); |
1616 | continue; |
1617 | } |
1618 | logevent("Received RSA challenge"); |
1619 | ssh1_read_bignum(pktin.body, &challenge); |
1620 | { |
1621 | char *agentreq, *q, *ret; |
1622 | int len, retlen; |
1623 | len = 1 + 4; /* message type, bit count */ |
1624 | len += ssh1_bignum_length(key.exponent); |
1625 | len += ssh1_bignum_length(key.modulus); |
1626 | len += ssh1_bignum_length(challenge); |
1627 | len += 16; /* session id */ |
1628 | len += 4; /* response format */ |
dcbde236 |
1629 | agentreq = smalloc(4 + len); |
5c58ad2d |
1630 | PUT_32BIT(agentreq, len); |
1631 | q = agentreq + 4; |
1983e559 |
1632 | *q++ = SSH1_AGENTC_RSA_CHALLENGE; |
5c58ad2d |
1633 | PUT_32BIT(q, ssh1_bignum_bitcount(key.modulus)); |
1634 | q += 4; |
1635 | q += ssh1_write_bignum(q, key.exponent); |
1636 | q += ssh1_write_bignum(q, key.modulus); |
1637 | q += ssh1_write_bignum(q, challenge); |
1638 | memcpy(q, session_id, 16); q += 16; |
1639 | PUT_32BIT(q, 1); /* response format */ |
1640 | agent_query(agentreq, len+4, &ret, &retlen); |
dcbde236 |
1641 | sfree(agentreq); |
5c58ad2d |
1642 | if (ret) { |
1983e559 |
1643 | if (ret[4] == SSH1_AGENT_RSA_RESPONSE) { |
5c58ad2d |
1644 | logevent("Sending Pageant's response"); |
1645 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1646 | PKT_DATA, ret+5, 16, PKT_END); |
dcbde236 |
1647 | sfree(ret); |
5c58ad2d |
1648 | crWaitUntil(ispkt); |
1649 | if (pktin.type == SSH1_SMSG_SUCCESS) { |
1650 | logevent("Pageant's response accepted"); |
c4fa2fce |
1651 | if (flags & FLAG_VERBOSE) { |
1408a877 |
1652 | c_write_str("Authenticated using RSA key \""); |
c4fa2fce |
1653 | c_write(commentp, commentlen); |
1408a877 |
1654 | c_write_str("\" from agent\r\n"); |
c4fa2fce |
1655 | } |
5c58ad2d |
1656 | authed = TRUE; |
1657 | } else |
1658 | logevent("Pageant's response not accepted"); |
1659 | } else { |
1660 | logevent("Pageant failed to answer challenge"); |
dcbde236 |
1661 | sfree(ret); |
5c58ad2d |
1662 | } |
1663 | } else { |
1664 | logevent("No reply received from Pageant"); |
1665 | } |
1666 | } |
1667 | freebn(key.exponent); |
1668 | freebn(key.modulus); |
1669 | freebn(challenge); |
1670 | if (authed) |
1671 | break; |
1672 | } |
1673 | } |
1674 | if (authed) |
1675 | break; |
1676 | } |
7cca0d81 |
1677 | if (*cfg.keyfile && !tried_publickey) |
1678 | pwpkt_type = SSH1_CMSG_AUTH_RSA; |
fb09bf1c |
1679 | |
a52f067e |
1680 | if (pktin.type == SSH1_SMSG_FAILURE && |
1681 | cfg.try_tis_auth && |
1682 | (supported_auths_mask & (1<<SSH1_AUTH_TIS))) { |
1683 | pwpkt_type = SSH1_CMSG_AUTH_TIS_RESPONSE; |
1684 | logevent("Requested TIS authentication"); |
1685 | send_packet(SSH1_CMSG_AUTH_TIS, PKT_END); |
1686 | crWaitUntil(ispkt); |
1687 | if (pktin.type != SSH1_SMSG_AUTH_TIS_CHALLENGE) { |
1688 | logevent("TIS authentication declined"); |
1689 | if (flags & FLAG_INTERACTIVE) |
1408a877 |
1690 | c_write_str("TIS authentication refused.\r\n"); |
a52f067e |
1691 | } else { |
1692 | int challengelen = ((pktin.body[0] << 24) | |
1693 | (pktin.body[1] << 16) | |
1694 | (pktin.body[2] << 8) | |
1695 | (pktin.body[3])); |
1696 | logevent("Received TIS challenge"); |
1697 | if (challengelen > sizeof(prompt)-1) |
1698 | challengelen = sizeof(prompt)-1; /* prevent overrun */ |
1699 | memcpy(prompt, pktin.body+4, challengelen); |
1700 | prompt[challengelen] = '\0'; |
1701 | } |
1702 | } |
1703 | if (pktin.type == SSH1_SMSG_FAILURE && |
1704 | cfg.try_tis_auth && |
1705 | (supported_auths_mask & (1<<SSH1_AUTH_CCARD))) { |
1706 | pwpkt_type = SSH1_CMSG_AUTH_CCARD_RESPONSE; |
1707 | logevent("Requested CryptoCard authentication"); |
1708 | send_packet(SSH1_CMSG_AUTH_CCARD, PKT_END); |
1709 | crWaitUntil(ispkt); |
1710 | if (pktin.type != SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
1711 | logevent("CryptoCard authentication declined"); |
1408a877 |
1712 | c_write_str("CryptoCard authentication refused.\r\n"); |
a52f067e |
1713 | } else { |
1714 | int challengelen = ((pktin.body[0] << 24) | |
1715 | (pktin.body[1] << 16) | |
1716 | (pktin.body[2] << 8) | |
1717 | (pktin.body[3])); |
1718 | logevent("Received CryptoCard challenge"); |
1719 | if (challengelen > sizeof(prompt)-1) |
1720 | challengelen = sizeof(prompt)-1; /* prevent overrun */ |
1721 | memcpy(prompt, pktin.body+4, challengelen); |
1722 | strncpy(prompt + challengelen, "\r\nResponse : ", |
1723 | sizeof(prompt)-challengelen); |
1724 | prompt[sizeof(prompt)-1] = '\0'; |
1725 | } |
1726 | } |
1727 | if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) { |
1728 | sprintf(prompt, "%.90s@%.90s's password: ", |
b585ec46 |
1729 | username, savedhost); |
a52f067e |
1730 | } |
1731 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
1732 | char *comment = NULL; |
1733 | if (flags & FLAG_VERBOSE) |
1408a877 |
1734 | c_write_str("Trying public key authentication.\r\n"); |
a52f067e |
1735 | if (!rsakey_encrypted(cfg.keyfile, &comment)) { |
1736 | if (flags & FLAG_VERBOSE) |
1408a877 |
1737 | c_write_str("No passphrase required.\r\n"); |
a52f067e |
1738 | goto tryauth; |
1739 | } |
1740 | sprintf(prompt, "Passphrase for key \"%.100s\": ", comment); |
dcbde236 |
1741 | sfree(comment); |
a52f067e |
1742 | } |
1743 | |
d8426c54 |
1744 | if (ssh_get_password) { |
85ee8208 |
1745 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
1746 | /* |
1747 | * get_password failed to get a password (for |
1748 | * example because one was supplied on the command |
1749 | * line which has already failed to work). |
1750 | * Terminate. |
1751 | */ |
1752 | logevent("No more passwords to try"); |
1753 | ssh_state = SSH_STATE_CLOSED; |
1754 | crReturn(1); |
1755 | } |
fb09bf1c |
1756 | } else { |
1408a877 |
1757 | c_write_str(prompt); |
7cca0d81 |
1758 | pos = 0; |
67779be7 |
1759 | ssh_send_ok = 1; |
7cca0d81 |
1760 | while (pos >= 0) { |
1761 | crWaitUntil(!ispkt); |
1762 | while (inlen--) switch (c = *in++) { |
1763 | case 10: case 13: |
1764 | password[pos] = 0; |
1765 | pos = -1; |
1766 | break; |
1767 | case 8: case 127: |
1768 | if (pos > 0) |
1769 | pos--; |
1770 | break; |
1771 | case 21: case 27: |
1772 | pos = 0; |
1773 | break; |
1774 | case 3: case 4: |
1775 | random_save_seed(); |
1776 | exit(0); |
1777 | break; |
1778 | default: |
1779 | if (((c >= ' ' && c <= '~') || |
1780 | ((unsigned char)c >= 160)) && pos < sizeof(password)) |
1781 | password[pos++] = c; |
1782 | break; |
1783 | } |
1784 | } |
1408a877 |
1785 | c_write_str("\r\n"); |
a52f067e |
1786 | } |
fb09bf1c |
1787 | |
7cca0d81 |
1788 | tryauth: |
1789 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
1790 | /* |
1791 | * Try public key authentication with the specified |
1792 | * key file. |
1793 | */ |
1794 | static struct RSAKey pubkey; |
1795 | static Bignum challenge, response; |
1796 | static int i; |
1797 | static unsigned char buffer[32]; |
1798 | |
1799 | tried_publickey = 1; |
65a22376 |
1800 | i = loadrsakey(cfg.keyfile, &pubkey, password); |
7cca0d81 |
1801 | if (i == 0) { |
1408a877 |
1802 | c_write_str("Couldn't load public key from "); |
1803 | c_write_str(cfg.keyfile); |
1804 | c_write_str(".\r\n"); |
7cca0d81 |
1805 | continue; /* go and try password */ |
1806 | } |
1807 | if (i == -1) { |
1408a877 |
1808 | c_write_str("Wrong passphrase.\r\n"); |
7cca0d81 |
1809 | tried_publickey = 0; |
1810 | continue; /* try again */ |
1811 | } |
1812 | |
1813 | /* |
1814 | * Send a public key attempt. |
1815 | */ |
1816 | send_packet(SSH1_CMSG_AUTH_RSA, |
1817 | PKT_BIGNUM, pubkey.modulus, PKT_END); |
1818 | |
1819 | crWaitUntil(ispkt); |
1820 | if (pktin.type == SSH1_SMSG_FAILURE) { |
1408a877 |
1821 | c_write_str("Server refused our public key.\r\n"); |
7cca0d81 |
1822 | continue; /* go and try password */ |
1823 | } |
8d5de777 |
1824 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1825 | bombout(("Bizarre response to offer of public key")); |
1826 | crReturn(0); |
1827 | } |
7cca0d81 |
1828 | ssh1_read_bignum(pktin.body, &challenge); |
1829 | response = rsadecrypt(challenge, &pubkey); |
1830 | freebn(pubkey.private_exponent); /* burn the evidence */ |
1831 | |
3709bfe9 |
1832 | for (i = 0; i < 32; i++) { |
1833 | buffer[i] = bignum_byte(response, 31-i); |
7cca0d81 |
1834 | } |
1835 | |
1836 | MD5Init(&md5c); |
1837 | MD5Update(&md5c, buffer, 32); |
1838 | MD5Update(&md5c, session_id, 16); |
1839 | MD5Final(buffer, &md5c); |
1840 | |
1841 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1842 | PKT_DATA, buffer, 16, PKT_END); |
1843 | |
1844 | crWaitUntil(ispkt); |
1845 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1846 | if (flags & FLAG_VERBOSE) |
1408a877 |
1847 | c_write_str("Failed to authenticate with our public key.\r\n"); |
7cca0d81 |
1848 | continue; /* go and try password */ |
1849 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1850 | bombout(("Bizarre response to RSA authentication response")); |
1851 | crReturn(0); |
7cca0d81 |
1852 | } |
1853 | |
1854 | break; /* we're through! */ |
1855 | } else { |
39065bed |
1856 | if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) { |
1857 | /* |
1858 | * Defence against traffic analysis: we send a |
1859 | * whole bunch of packets containing strings of |
1860 | * different lengths. One of these strings is the |
1861 | * password, in a SSH1_CMSG_AUTH_PASSWORD packet. |
1862 | * The others are all random data in |
1863 | * SSH1_MSG_IGNORE packets. This way a passive |
1864 | * listener can't tell which is the password, and |
1865 | * hence can't deduce the password length. |
1866 | * |
1867 | * Anybody with a password length greater than 16 |
1868 | * bytes is going to have enough entropy in their |
1869 | * password that a listener won't find it _that_ |
1870 | * much help to know how long it is. So what we'll |
1871 | * do is: |
1872 | * |
1873 | * - if password length < 16, we send 15 packets |
1874 | * containing string lengths 1 through 15 |
1875 | * |
1876 | * - otherwise, we let N be the nearest multiple |
1877 | * of 8 below the password length, and send 8 |
1878 | * packets containing string lengths N through |
1879 | * N+7. This won't obscure the order of |
1880 | * magnitude of the password length, but it will |
1881 | * introduce a bit of extra uncertainty. |
7d503c31 |
1882 | * |
1883 | * A few servers (the old 1.2.18 through 1.2.22) |
1884 | * can't deal with SSH1_MSG_IGNORE. For these |
1885 | * servers, we need an alternative defence. We make |
1886 | * use of the fact that the password is interpreted |
1887 | * as a C string: so we can append a NUL, then some |
1888 | * random data. |
39065bed |
1889 | */ |
7d503c31 |
1890 | if (ssh_remote_bugs & BUG_CHOKES_ON_SSH1_IGNORE) { |
1891 | char string[64]; |
1892 | char *s; |
1893 | int len; |
1894 | |
1895 | len = strlen(password); |
1896 | if (len < sizeof(string)) { |
1897 | s = string; |
1898 | strcpy(string, password); |
1899 | len++; /* cover the zero byte */ |
1900 | while (len < sizeof(string)) { |
1901 | string[len++] = (char)random_byte(); |
1902 | } |
1903 | } else { |
1904 | s = password; |
1905 | } |
1906 | send_packet(pwpkt_type, PKT_INT, len, |
1907 | PKT_DATA, s, len, PKT_END); |
39065bed |
1908 | } else { |
7d503c31 |
1909 | int bottom, top, pwlen, i; |
1910 | char *randomstr; |
1911 | |
1912 | pwlen = strlen(password); |
1913 | if (pwlen < 16) { |
1914 | bottom = 1; |
1915 | top = 15; |
1916 | } else { |
1917 | bottom = pwlen &~ 7; |
1918 | top = bottom + 7; |
1919 | } |
39065bed |
1920 | |
7d503c31 |
1921 | assert(pwlen >= bottom && pwlen <= top); |
39065bed |
1922 | |
7d503c31 |
1923 | randomstr = smalloc(top+1); |
39065bed |
1924 | |
7d503c31 |
1925 | for (i = bottom; i <= top; i++) { |
1926 | if (i == pwlen) |
1927 | defer_packet(pwpkt_type, PKT_STR, password, PKT_END); |
1928 | else { |
1929 | for (j = 0; j < i; j++) { |
1930 | do { |
1931 | randomstr[j] = random_byte(); |
1932 | } while (randomstr[j] == '\0'); |
1933 | } |
1934 | randomstr[i] = '\0'; |
1935 | defer_packet(SSH1_MSG_IGNORE, |
1936 | PKT_STR, randomstr, PKT_END); |
39065bed |
1937 | } |
39065bed |
1938 | } |
7d503c31 |
1939 | ssh_pkt_defersend(); |
39065bed |
1940 | } |
39065bed |
1941 | } else { |
1942 | send_packet(pwpkt_type, PKT_STR, password, PKT_END); |
1943 | } |
7cca0d81 |
1944 | } |
c5e9c988 |
1945 | logevent("Sent password"); |
374330e2 |
1946 | memset(password, 0, strlen(password)); |
fb09bf1c |
1947 | crWaitUntil(ispkt); |
e5574168 |
1948 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1949 | if (flags & FLAG_VERBOSE) |
1408a877 |
1950 | c_write_str("Access denied\r\n"); |
c5e9c988 |
1951 | logevent("Authentication refused"); |
e5574168 |
1952 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
fb09bf1c |
1953 | logevent("Received disconnect request"); |
85ee8208 |
1954 | ssh_state = SSH_STATE_CLOSED; |
1955 | crReturn(1); |
e5574168 |
1956 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1957 | bombout(("Strange packet received, type %d", pktin.type)); |
1958 | crReturn(0); |
374330e2 |
1959 | } |
1960 | } |
1961 | |
c5e9c988 |
1962 | logevent("Authentication successful"); |
1963 | |
fb09bf1c |
1964 | crFinish(1); |
1965 | } |
1966 | |
9c964e85 |
1967 | void sshfwd_close(struct ssh_channel *c) { |
783415f8 |
1968 | if (c) { |
1969 | if (ssh_version == 1) { |
1970 | send_packet(SSH1_MSG_CHANNEL_CLOSE, PKT_INT, c->remoteid, PKT_END); |
1971 | } else { |
1972 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
1973 | ssh2_pkt_adduint32(c->remoteid); |
1974 | ssh2_pkt_send(); |
1975 | } |
1976 | c->closes = 1; |
1977 | if (c->type == CHAN_X11) { |
1978 | c->u.x11.s = NULL; |
1979 | logevent("X11 connection terminated"); |
1980 | } |
1981 | } |
9c964e85 |
1982 | } |
1983 | |
1984 | void sshfwd_write(struct ssh_channel *c, char *buf, int len) { |
783415f8 |
1985 | if (ssh_version == 1) { |
1986 | send_packet(SSH1_MSG_CHANNEL_DATA, |
1987 | PKT_INT, c->remoteid, |
1988 | PKT_INT, len, |
1989 | PKT_DATA, buf, len, |
1990 | PKT_END); |
1991 | } else { |
1992 | ssh2_add_channel_data(c, buf, len); |
1993 | ssh2_try_send(c); |
1994 | } |
9c964e85 |
1995 | } |
1996 | |
e5574168 |
1997 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt) { |
fb09bf1c |
1998 | crBegin; |
1999 | |
2000 | random_init(); |
2001 | |
e5574168 |
2002 | while (!do_ssh1_login(in, inlen, ispkt)) { |
fb09bf1c |
2003 | crReturnV; |
85ee8208 |
2004 | } |
2005 | if (ssh_state == SSH_STATE_CLOSED) |
2006 | crReturnV; |
fb09bf1c |
2007 | |
979310f1 |
2008 | if (cfg.agentfwd && agent_exists()) { |
dacbd0e8 |
2009 | logevent("Requesting agent forwarding"); |
2010 | send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING, PKT_END); |
2011 | do { crReturnV; } while (!ispkt); |
2012 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
2013 | bombout(("Protocol confusion")); |
2014 | crReturnV; |
dacbd0e8 |
2015 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
2016 | logevent("Agent forwarding refused"); |
db7d555c |
2017 | } else { |
dacbd0e8 |
2018 | logevent("Agent forwarding enabled"); |
db7d555c |
2019 | ssh_agentfwd_enabled = TRUE; |
2020 | } |
dacbd0e8 |
2021 | } |
2022 | |
9c964e85 |
2023 | if (cfg.x11_forward) { |
2024 | char proto[20], data[64]; |
2025 | logevent("Requesting X11 forwarding"); |
2026 | x11_invent_auth(proto, sizeof(proto), data, sizeof(data)); |
2027 | send_packet(SSH1_CMSG_X11_REQUEST_FORWARDING, |
2028 | PKT_STR, proto, PKT_STR, data, |
2029 | PKT_INT, 0, |
2030 | PKT_END); |
2031 | do { crReturnV; } while (!ispkt); |
2032 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
2033 | bombout(("Protocol confusion")); |
2034 | crReturnV; |
2035 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
2036 | logevent("X11 forwarding refused"); |
2037 | } else { |
2038 | logevent("X11 forwarding enabled"); |
2039 | ssh_X11_fwd_enabled = TRUE; |
2040 | } |
2041 | } |
2042 | |
fef97f43 |
2043 | if (!cfg.nopty) { |
e5574168 |
2044 | send_packet(SSH1_CMSG_REQUEST_PTY, |
fb09bf1c |
2045 | PKT_STR, cfg.termtype, |
2046 | PKT_INT, rows, PKT_INT, cols, |
2047 | PKT_INT, 0, PKT_INT, 0, |
2048 | PKT_CHAR, 0, |
2049 | PKT_END); |
fef97f43 |
2050 | ssh_state = SSH_STATE_INTERMED; |
2051 | do { crReturnV; } while (!ispkt); |
e5574168 |
2052 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
2053 | bombout(("Protocol confusion")); |
2054 | crReturnV; |
e5574168 |
2055 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
1408a877 |
2056 | c_write_str("Server refused to allocate pty\r\n"); |
0965bee0 |
2057 | ssh_editing = ssh_echoing = 1; |
fef97f43 |
2058 | } |
c5e9c988 |
2059 | logevent("Allocated pty"); |
0965bee0 |
2060 | } else { |
2061 | ssh_editing = ssh_echoing = 1; |
374330e2 |
2062 | } |
2063 | |
4ba9b64b |
2064 | if (cfg.compression) { |
2065 | send_packet(SSH1_CMSG_REQUEST_COMPRESSION, PKT_INT, 6, PKT_END); |
2066 | do { crReturnV; } while (!ispkt); |
2067 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
2068 | bombout(("Protocol confusion")); |
2069 | crReturnV; |
2070 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
1408a877 |
2071 | c_write_str("Server refused to compress\r\n"); |
4ba9b64b |
2072 | } |
2073 | logevent("Started compression"); |
2074 | ssh1_compressing = TRUE; |
2075 | zlib_compress_init(); |
2076 | zlib_decompress_init(); |
2077 | } |
2078 | |
6abbf9e3 |
2079 | if (*cfg.remote_cmd) |
2080 | send_packet(SSH1_CMSG_EXEC_CMD, PKT_STR, cfg.remote_cmd, PKT_END); |
2081 | else |
2082 | send_packet(SSH1_CMSG_EXEC_SHELL, PKT_END); |
c5e9c988 |
2083 | logevent("Started session"); |
374330e2 |
2084 | |
2085 | ssh_state = SSH_STATE_SESSION; |
2086 | if (size_needed) |
2087 | ssh_size(); |
3687d221 |
2088 | if (eof_needed) |
2089 | ssh_special(TS_EOF); |
374330e2 |
2090 | |
0965bee0 |
2091 | ldisc_send(NULL, 0); /* cause ldisc to notice changes */ |
8ccc75b0 |
2092 | ssh_send_ok = 1; |
dacbd0e8 |
2093 | ssh_channels = newtree234(ssh_channelcmp); |
374330e2 |
2094 | while (1) { |
2095 | crReturnV; |
2096 | if (ispkt) { |
e5574168 |
2097 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
2098 | pktin.type == SSH1_SMSG_STDERR_DATA) { |
fb09bf1c |
2099 | long len = GET_32BIT(pktin.body); |
fe50e814 |
2100 | from_backend(pktin.type == SSH1_SMSG_STDERR_DATA, |
2101 | pktin.body+4, len); |
e5574168 |
2102 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
21248260 |
2103 | ssh_state = SSH_STATE_CLOSED; |
c5e9c988 |
2104 | logevent("Received disconnect request"); |
3257deae |
2105 | crReturnV; |
9c964e85 |
2106 | } else if (pktin.type == SSH1_SMSG_X11_OPEN) { |
2107 | /* Remote side is trying to open a channel to talk to our |
2108 | * X-Server. Give them back a local channel number. */ |
2109 | unsigned i; |
2110 | struct ssh_channel *c, *d; |
2111 | enum234 e; |
2112 | |
2113 | logevent("Received X11 connect request"); |
2114 | /* Refuse if X11 forwarding is disabled. */ |
2115 | if (!ssh_X11_fwd_enabled) { |
2116 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
2117 | PKT_INT, GET_32BIT(pktin.body), |
2118 | PKT_END); |
2119 | logevent("Rejected X11 connect request"); |
2120 | } else { |
9c964e85 |
2121 | c = smalloc(sizeof(struct ssh_channel)); |
2122 | |
0c6c9a70 |
2123 | if ( x11_init(&c->u.x11.s, cfg.x11_display, c) != NULL ) { |
9c964e85 |
2124 | logevent("opening X11 forward connection failed"); |
2125 | sfree(c); |
2126 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
2127 | PKT_INT, GET_32BIT(pktin.body), |
2128 | PKT_END); |
2129 | } else { |
2130 | logevent("opening X11 forward connection succeeded"); |
2131 | for (i=1, d = first234(ssh_channels, &e); d; d = next234(&e)) { |
783415f8 |
2132 | if (d->localid > i) |
2133 | break; /* found a free number */ |
2134 | i = d->localid + 1; |
9c964e85 |
2135 | } |
2136 | c->remoteid = GET_32BIT(pktin.body); |
2137 | c->localid = i; |
2138 | c->closes = 0; |
783415f8 |
2139 | c->type = CHAN_X11; /* identify channel type */ |
9c964e85 |
2140 | add234(ssh_channels, c); |
2141 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
2142 | PKT_INT, c->remoteid, PKT_INT, c->localid, |
2143 | PKT_END); |
2144 | logevent("Opened X11 forward channel"); |
2145 | } |
2146 | } |
dacbd0e8 |
2147 | } else if (pktin.type == SSH1_SMSG_AGENT_OPEN) { |
2148 | /* Remote side is trying to open a channel to talk to our |
2149 | * agent. Give them back a local channel number. */ |
db7d555c |
2150 | unsigned i; |
dacbd0e8 |
2151 | struct ssh_channel *c; |
2152 | enum234 e; |
db7d555c |
2153 | |
2154 | /* Refuse if agent forwarding is disabled. */ |
2155 | if (!ssh_agentfwd_enabled) { |
2156 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
2157 | PKT_INT, GET_32BIT(pktin.body), |
2158 | PKT_END); |
2159 | } else { |
2160 | i = 1; |
2161 | for (c = first234(ssh_channels, &e); c; c = next234(&e)) { |
2162 | if (c->localid > i) |
2163 | break; /* found a free number */ |
2164 | i = c->localid + 1; |
2165 | } |
dcbde236 |
2166 | c = smalloc(sizeof(struct ssh_channel)); |
db7d555c |
2167 | c->remoteid = GET_32BIT(pktin.body); |
2168 | c->localid = i; |
2169 | c->closes = 0; |
783415f8 |
2170 | c->type = CHAN_AGENT; /* identify channel type */ |
db7d555c |
2171 | c->u.a.lensofar = 0; |
2172 | add234(ssh_channels, c); |
2173 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
2174 | PKT_INT, c->remoteid, PKT_INT, c->localid, |
2175 | PKT_END); |
2176 | } |
2177 | } else if (pktin.type == SSH1_MSG_CHANNEL_CLOSE || |
2178 | pktin.type == SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION) { |
dacbd0e8 |
2179 | /* Remote side closes a channel. */ |
d211621f |
2180 | unsigned i = GET_32BIT(pktin.body); |
dacbd0e8 |
2181 | struct ssh_channel *c; |
2182 | c = find234(ssh_channels, &i, ssh_channelfind); |
2183 | if (c) { |
2184 | int closetype; |
2185 | closetype = (pktin.type == SSH1_MSG_CHANNEL_CLOSE ? 1 : 2); |
2186 | send_packet(pktin.type, PKT_INT, c->remoteid, PKT_END); |
783415f8 |
2187 | if ((c->closes == 0) && (c->type == CHAN_X11)) { |
9c964e85 |
2188 | logevent("X11 connection closed"); |
2189 | assert(c->u.x11.s != NULL); |
2190 | x11_close(c->u.x11.s); |
2191 | c->u.x11.s = NULL; |
2192 | } |
dacbd0e8 |
2193 | c->closes |= closetype; |
2194 | if (c->closes == 3) { |
2195 | del234(ssh_channels, c); |
dcbde236 |
2196 | sfree(c); |
dacbd0e8 |
2197 | } |
2198 | } |
2199 | } else if (pktin.type == SSH1_MSG_CHANNEL_DATA) { |
2200 | /* Data sent down one of our channels. */ |
2201 | int i = GET_32BIT(pktin.body); |
2202 | int len = GET_32BIT(pktin.body+4); |
2203 | unsigned char *p = pktin.body+8; |
2204 | struct ssh_channel *c; |
2205 | c = find234(ssh_channels, &i, ssh_channelfind); |
2206 | if (c) { |
2207 | switch(c->type) { |
783415f8 |
2208 | case CHAN_X11: |
9c964e85 |
2209 | x11_send(c->u.x11.s, p, len); |
2210 | break; |
783415f8 |
2211 | case CHAN_AGENT: |
dacbd0e8 |
2212 | /* Data for an agent message. Buffer it. */ |
2213 | while (len > 0) { |
2214 | if (c->u.a.lensofar < 4) { |
2215 | int l = min(4 - c->u.a.lensofar, len); |
2216 | memcpy(c->u.a.msglen + c->u.a.lensofar, p, l); |
2217 | p += l; len -= l; c->u.a.lensofar += l; |
2218 | } |
2219 | if (c->u.a.lensofar == 4) { |
2220 | c->u.a.totallen = 4 + GET_32BIT(c->u.a.msglen); |
dcbde236 |
2221 | c->u.a.message = smalloc(c->u.a.totallen); |
dacbd0e8 |
2222 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
2223 | } |
2224 | if (c->u.a.lensofar >= 4 && len > 0) { |
2225 | int l = min(c->u.a.totallen - c->u.a.lensofar, len); |
2226 | memcpy(c->u.a.message + c->u.a.lensofar, p, l); |
2227 | p += l; len -= l; c->u.a.lensofar += l; |
2228 | } |
2229 | if (c->u.a.lensofar == c->u.a.totallen) { |
2230 | void *reply, *sentreply; |
2231 | int replylen; |
2232 | agent_query(c->u.a.message, c->u.a.totallen, |
2233 | &reply, &replylen); |
2234 | if (reply) |
2235 | sentreply = reply; |
2236 | else { |
2237 | /* Fake SSH_AGENT_FAILURE. */ |
2238 | sentreply = "\0\0\0\1\5"; |
2239 | replylen = 5; |
2240 | } |
2241 | send_packet(SSH1_MSG_CHANNEL_DATA, |
2242 | PKT_INT, c->remoteid, |
2243 | PKT_INT, replylen, |
2244 | PKT_DATA, sentreply, replylen, |
2245 | PKT_END); |
2246 | if (reply) |
dcbde236 |
2247 | sfree(reply); |
2248 | sfree(c->u.a.message); |
dacbd0e8 |
2249 | c->u.a.lensofar = 0; |
2250 | } |
2251 | } |
2252 | break; |
2253 | } |
2254 | } |
e5574168 |
2255 | } else if (pktin.type == SSH1_SMSG_SUCCESS) { |
972a41c8 |
2256 | /* may be from EXEC_SHELL on some servers */ |
e5574168 |
2257 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
972a41c8 |
2258 | /* may be from EXEC_SHELL on some servers |
374330e2 |
2259 | * if no pty is available or in other odd cases. Ignore */ |
e5574168 |
2260 | } else if (pktin.type == SSH1_SMSG_EXIT_STATUS) { |
2261 | send_packet(SSH1_CMSG_EXIT_CONFIRMATION, PKT_END); |
374330e2 |
2262 | } else { |
8d5de777 |
2263 | bombout(("Strange packet received: type %d", pktin.type)); |
2264 | crReturnV; |
374330e2 |
2265 | } |
2266 | } else { |
8df7a775 |
2267 | while (inlen > 0) { |
2268 | int len = min(inlen, 512); |
2269 | send_packet(SSH1_CMSG_STDIN_DATA, |
2270 | PKT_INT, len, PKT_DATA, in, len, PKT_END); |
2271 | in += len; |
2272 | inlen -= len; |
2273 | } |
374330e2 |
2274 | } |
2275 | } |
2276 | |
2277 | crFinishV; |
2278 | } |
2279 | |
2280 | /* |
e5574168 |
2281 | * Utility routine for decoding comma-separated strings in KEXINIT. |
2282 | */ |
75cab814 |
2283 | static int in_commasep_string(char *needle, char *haystack, int haylen) { |
e5574168 |
2284 | int needlen = strlen(needle); |
2285 | while (1) { |
2286 | /* |
2287 | * Is it at the start of the string? |
2288 | */ |
2289 | if (haylen >= needlen && /* haystack is long enough */ |
2290 | !memcmp(needle, haystack, needlen) && /* initial match */ |
2291 | (haylen == needlen || haystack[needlen] == ',') |
2292 | /* either , or EOS follows */ |
2293 | ) |
2294 | return 1; |
2295 | /* |
2296 | * If not, search for the next comma and resume after that. |
2297 | * If no comma found, terminate. |
2298 | */ |
2299 | while (haylen > 0 && *haystack != ',') |
2300 | haylen--, haystack++; |
2301 | if (haylen == 0) |
2302 | return 0; |
2303 | haylen--, haystack++; /* skip over comma itself */ |
2304 | } |
2305 | } |
2306 | |
2307 | /* |
d39f364a |
2308 | * SSH2 key creation method. |
2309 | */ |
5e0d7cb8 |
2310 | static void ssh2_mkkey(Bignum K, char *H, char *sessid, char chr, char *keyspace) { |
d39f364a |
2311 | SHA_State s; |
2312 | /* First 20 bytes. */ |
2313 | SHA_Init(&s); |
2314 | sha_mpint(&s, K); |
2315 | SHA_Bytes(&s, H, 20); |
2316 | SHA_Bytes(&s, &chr, 1); |
5e0d7cb8 |
2317 | SHA_Bytes(&s, sessid, 20); |
d39f364a |
2318 | SHA_Final(&s, keyspace); |
2319 | /* Next 20 bytes. */ |
2320 | SHA_Init(&s); |
2321 | sha_mpint(&s, K); |
2322 | SHA_Bytes(&s, H, 20); |
2323 | SHA_Bytes(&s, keyspace, 20); |
2324 | SHA_Final(&s, keyspace+20); |
2325 | } |
2326 | |
2327 | /* |
7cca0d81 |
2328 | * Handle the SSH2 transport layer. |
e5574168 |
2329 | */ |
7cca0d81 |
2330 | static int do_ssh2_transport(unsigned char *in, int inlen, int ispkt) |
e5574168 |
2331 | { |
7bd5a860 |
2332 | static int i, j, len, nbits, pbits; |
e5574168 |
2333 | static char *str; |
a92dd380 |
2334 | static Bignum p, g, e, f, K; |
2335 | static int kex_init_value, kex_reply_value; |
7591b9ff |
2336 | static const struct ssh_mac **maclist; |
8b2715b2 |
2337 | static int nmacs; |
0a3f1d48 |
2338 | static const struct ssh2_cipher *cscipher_tobe = NULL; |
2339 | static const struct ssh2_cipher *sccipher_tobe = NULL; |
57476f6b |
2340 | static const struct ssh_mac *csmac_tobe = NULL; |
2341 | static const struct ssh_mac *scmac_tobe = NULL; |
2342 | static const struct ssh_compress *cscomp_tobe = NULL; |
2343 | static const struct ssh_compress *sccomp_tobe = NULL; |
d5859615 |
2344 | static char *hostkeydata, *sigdata, *keystr, *fingerprint; |
e5574168 |
2345 | static int hostkeylen, siglen; |
e055a386 |
2346 | static void *hkey; /* actual host key */ |
e5574168 |
2347 | static unsigned char exchange_hash[20]; |
d39f364a |
2348 | static unsigned char keyspace[40]; |
0a3f1d48 |
2349 | static const struct ssh2_ciphers *preferred_cipher; |
4ba9b64b |
2350 | static const struct ssh_compress *preferred_comp; |
0db56f73 |
2351 | static int first_kex; |
e5574168 |
2352 | |
2353 | crBegin; |
7cca0d81 |
2354 | random_init(); |
0db56f73 |
2355 | first_kex = 1; |
e5574168 |
2356 | |
5e8358ad |
2357 | /* |
4ba9b64b |
2358 | * Set up the preferred cipher and compression. |
5e8358ad |
2359 | */ |
2360 | if (cfg.cipher == CIPHER_BLOWFISH) { |
0a3f1d48 |
2361 | preferred_cipher = &ssh2_blowfish; |
5e8358ad |
2362 | } else if (cfg.cipher == CIPHER_DES) { |
2363 | logevent("Single DES not supported in SSH2; using 3DES"); |
0a3f1d48 |
2364 | preferred_cipher = &ssh2_3des; |
5e8358ad |
2365 | } else if (cfg.cipher == CIPHER_3DES) { |
0a3f1d48 |
2366 | preferred_cipher = &ssh2_3des; |
2367 | } else if (cfg.cipher == CIPHER_AES) { |
2368 | preferred_cipher = &ssh2_aes; |
5e8358ad |
2369 | } else { |
2370 | /* Shouldn't happen, but we do want to initialise to _something_. */ |
0a3f1d48 |
2371 | preferred_cipher = &ssh2_3des; |
5e8358ad |
2372 | } |
4ba9b64b |
2373 | if (cfg.compression) |
2374 | preferred_comp = &ssh_zlib; |
2375 | else |
2376 | preferred_comp = &ssh_comp_none; |
5e8358ad |
2377 | |
7591b9ff |
2378 | /* |
2379 | * Be prepared to work around the buggy MAC problem. |
2380 | */ |
7d503c31 |
2381 | if (cfg.buggymac || (ssh_remote_bugs & BUG_SSH2_HMAC)) |
8b2715b2 |
2382 | maclist = buggymacs, nmacs = lenof(buggymacs); |
7591b9ff |
2383 | else |
8b2715b2 |
2384 | maclist = macs, nmacs = lenof(macs); |
7591b9ff |
2385 | |
7cca0d81 |
2386 | begin_key_exchange: |
e5574168 |
2387 | /* |
2388 | * Construct and send our key exchange packet. |
2389 | */ |
2390 | ssh2_pkt_init(SSH2_MSG_KEXINIT); |
2391 | for (i = 0; i < 16; i++) |
2392 | ssh2_pkt_addbyte((unsigned char)random_byte()); |
2393 | /* List key exchange algorithms. */ |
2394 | ssh2_pkt_addstring_start(); |
2395 | for (i = 0; i < lenof(kex_algs); i++) { |
2396 | ssh2_pkt_addstring_str(kex_algs[i]->name); |
2397 | if (i < lenof(kex_algs)-1) |
2398 | ssh2_pkt_addstring_str(","); |
2399 | } |
2400 | /* List server host key algorithms. */ |
2401 | ssh2_pkt_addstring_start(); |
2402 | for (i = 0; i < lenof(hostkey_algs); i++) { |
2403 | ssh2_pkt_addstring_str(hostkey_algs[i]->name); |
2404 | if (i < lenof(hostkey_algs)-1) |
2405 | ssh2_pkt_addstring_str(","); |
2406 | } |
2407 | /* List client->server encryption algorithms. */ |
2408 | ssh2_pkt_addstring_start(); |
729e54b4 |
2409 | for (i = 0; i < lenof(ciphers)+1; i++) { |
0a3f1d48 |
2410 | const struct ssh2_ciphers *c = i==0 ? preferred_cipher : ciphers[i-1]; |
2411 | for (j = 0; j < c->nciphers; j++) { |
2412 | ssh2_pkt_addstring_str(c->list[j]->name); |
2413 | if (i < lenof(ciphers) || j < c->nciphers-1) |
2414 | ssh2_pkt_addstring_str(","); |
2415 | } |
e5574168 |
2416 | } |
2417 | /* List server->client encryption algorithms. */ |
2418 | ssh2_pkt_addstring_start(); |
729e54b4 |
2419 | for (i = 0; i < lenof(ciphers)+1; i++) { |
0a3f1d48 |
2420 | const struct ssh2_ciphers *c = i==0 ? preferred_cipher : ciphers[i-1]; |
2421 | for (j = 0; j < c->nciphers; j++) { |
2422 | ssh2_pkt_addstring_str(c->list[j]->name); |
2423 | if (i < lenof(ciphers) || j < c->nciphers-1) |
2424 | ssh2_pkt_addstring_str(","); |
2425 | } |
e5574168 |
2426 | } |
2427 | /* List client->server MAC algorithms. */ |
2428 | ssh2_pkt_addstring_start(); |
8b2715b2 |
2429 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2430 | ssh2_pkt_addstring_str(maclist[i]->name); |
8b2715b2 |
2431 | if (i < nmacs-1) |
e5574168 |
2432 | ssh2_pkt_addstring_str(","); |
2433 | } |
2434 | /* List server->client MAC algorithms. */ |
2435 | ssh2_pkt_addstring_start(); |
8b2715b2 |
2436 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2437 | ssh2_pkt_addstring_str(maclist[i]->name); |
8b2715b2 |
2438 | if (i < nmacs-1) |
e5574168 |
2439 | ssh2_pkt_addstring_str(","); |
2440 | } |
2441 | /* List client->server compression algorithms. */ |
2442 | ssh2_pkt_addstring_start(); |
4ba9b64b |
2443 | for (i = 0; i < lenof(compressions)+1; i++) { |
2444 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2445 | ssh2_pkt_addstring_str(c->name); |
2446 | if (i < lenof(compressions)) |
e5574168 |
2447 | ssh2_pkt_addstring_str(","); |
2448 | } |
2449 | /* List server->client compression algorithms. */ |
2450 | ssh2_pkt_addstring_start(); |
4ba9b64b |
2451 | for (i = 0; i < lenof(compressions)+1; i++) { |
2452 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2453 | ssh2_pkt_addstring_str(c->name); |
2454 | if (i < lenof(compressions)) |
e5574168 |
2455 | ssh2_pkt_addstring_str(","); |
2456 | } |
2457 | /* List client->server languages. Empty list. */ |
2458 | ssh2_pkt_addstring_start(); |
2459 | /* List server->client languages. Empty list. */ |
2460 | ssh2_pkt_addstring_start(); |
2461 | /* First KEX packet does _not_ follow, because we're not that brave. */ |
2462 | ssh2_pkt_addbool(FALSE); |
2463 | /* Reserved. */ |
2464 | ssh2_pkt_adduint32(0); |
0db56f73 |
2465 | |
2466 | exhash = exhashbase; |
e5574168 |
2467 | sha_string(&exhash, pktout.data+5, pktout.length-5); |
0db56f73 |
2468 | |
e5574168 |
2469 | ssh2_pkt_send(); |
2470 | |
2471 | if (!ispkt) crWaitUntil(ispkt); |
2472 | sha_string(&exhash, pktin.data+5, pktin.length-5); |
2473 | |
2474 | /* |
2475 | * Now examine the other side's KEXINIT to see what we're up |
2476 | * to. |
2477 | */ |
7cca0d81 |
2478 | if (pktin.type != SSH2_MSG_KEXINIT) { |
8d5de777 |
2479 | bombout(("expected key exchange packet from server")); |
2480 | crReturn(0); |
7cca0d81 |
2481 | } |
e5574168 |
2482 | kex = NULL; hostkey = NULL; cscipher_tobe = NULL; sccipher_tobe = NULL; |
2483 | csmac_tobe = NULL; scmac_tobe = NULL; cscomp_tobe = NULL; sccomp_tobe = NULL; |
2484 | pktin.savedpos += 16; /* skip garbage cookie */ |
2485 | ssh2_pkt_getstring(&str, &len); /* key exchange algorithms */ |
2486 | for (i = 0; i < lenof(kex_algs); i++) { |
2487 | if (in_commasep_string(kex_algs[i]->name, str, len)) { |
2488 | kex = kex_algs[i]; |
2489 | break; |
2490 | } |
2491 | } |
2492 | ssh2_pkt_getstring(&str, &len); /* host key algorithms */ |
2493 | for (i = 0; i < lenof(hostkey_algs); i++) { |
2494 | if (in_commasep_string(hostkey_algs[i]->name, str, len)) { |
2495 | hostkey = hostkey_algs[i]; |
2496 | break; |
2497 | } |
2498 | } |
2499 | ssh2_pkt_getstring(&str, &len); /* client->server cipher */ |
729e54b4 |
2500 | for (i = 0; i < lenof(ciphers)+1; i++) { |
0a3f1d48 |
2501 | const struct ssh2_ciphers *c = i==0 ? preferred_cipher : ciphers[i-1]; |
2502 | for (j = 0; j < c->nciphers; j++) { |
2503 | if (in_commasep_string(c->list[j]->name, str, len)) { |
2504 | cscipher_tobe = c->list[j]; |
2505 | break; |
2506 | } |
e5574168 |
2507 | } |
0a3f1d48 |
2508 | if (cscipher_tobe) |
2509 | break; |
e5574168 |
2510 | } |
2511 | ssh2_pkt_getstring(&str, &len); /* server->client cipher */ |
729e54b4 |
2512 | for (i = 0; i < lenof(ciphers)+1; i++) { |
0a3f1d48 |
2513 | const struct ssh2_ciphers *c = i==0 ? preferred_cipher : ciphers[i-1]; |
2514 | for (j = 0; j < c->nciphers; j++) { |
2515 | if (in_commasep_string(c->list[j]->name, str, len)) { |
2516 | sccipher_tobe = c->list[j]; |
2517 | break; |
2518 | } |
e5574168 |
2519 | } |
0a3f1d48 |
2520 | if (sccipher_tobe) |
2521 | break; |
e5574168 |
2522 | } |
2523 | ssh2_pkt_getstring(&str, &len); /* client->server mac */ |
8b2715b2 |
2524 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2525 | if (in_commasep_string(maclist[i]->name, str, len)) { |
2526 | csmac_tobe = maclist[i]; |
e5574168 |
2527 | break; |
2528 | } |
2529 | } |
2530 | ssh2_pkt_getstring(&str, &len); /* server->client mac */ |
8b2715b2 |
2531 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2532 | if (in_commasep_string(maclist[i]->name, str, len)) { |
2533 | scmac_tobe = maclist[i]; |
e5574168 |
2534 | break; |
2535 | } |
2536 | } |
2537 | ssh2_pkt_getstring(&str, &len); /* client->server compression */ |
4ba9b64b |
2538 | for (i = 0; i < lenof(compressions)+1; i++) { |
2539 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2540 | if (in_commasep_string(c->name, str, len)) { |
2541 | cscomp_tobe = c; |
e5574168 |
2542 | break; |
2543 | } |
2544 | } |
2545 | ssh2_pkt_getstring(&str, &len); /* server->client compression */ |
4ba9b64b |
2546 | for (i = 0; i < lenof(compressions)+1; i++) { |
2547 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2548 | if (in_commasep_string(c->name, str, len)) { |
2549 | sccomp_tobe = c; |
e5574168 |
2550 | break; |
2551 | } |
2552 | } |
e5574168 |
2553 | |
2554 | /* |
7bd5a860 |
2555 | * Work out the number of bits of key we will need from the key |
2556 | * exchange. We start with the maximum key length of either |
2557 | * cipher... |
2558 | */ |
2559 | { |
2560 | int csbits, scbits; |
2561 | |
2562 | csbits = cscipher_tobe->keylen; |
2563 | scbits = sccipher_tobe->keylen; |
2564 | nbits = (csbits > scbits ? csbits : scbits); |
2565 | } |
2566 | /* The keys only have 160-bit entropy, since they're based on |
2567 | * a SHA-1 hash. So cap the key size at 160 bits. */ |
2568 | if (nbits > 160) nbits = 160; |
2569 | |
2570 | /* |
a92dd380 |
2571 | * If we're doing Diffie-Hellman group exchange, start by |
2572 | * requesting a group. |
e5574168 |
2573 | */ |
a92dd380 |
2574 | if (kex == &ssh_diffiehellman_gex) { |
a92dd380 |
2575 | logevent("Doing Diffie-Hellman group exchange"); |
2576 | /* |
7bd5a860 |
2577 | * Work out how big a DH group we will need to allow that |
2578 | * much data. |
2579 | */ |
2580 | pbits = 512 << ((nbits-1) / 64); |
a92dd380 |
2581 | ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST); |
7bd5a860 |
2582 | ssh2_pkt_adduint32(pbits); |
a92dd380 |
2583 | ssh2_pkt_send(); |
2584 | |
2585 | crWaitUntil(ispkt); |
2586 | if (pktin.type != SSH2_MSG_KEX_DH_GEX_GROUP) { |
2587 | bombout(("expected key exchange group packet from server")); |
2588 | crReturn(0); |
2589 | } |
2590 | p = ssh2_pkt_getmp(); |
2591 | g = ssh2_pkt_getmp(); |
2592 | dh_setup_group(p, g); |
2593 | kex_init_value = SSH2_MSG_KEX_DH_GEX_INIT; |
2594 | kex_reply_value = SSH2_MSG_KEX_DH_GEX_REPLY; |
2595 | } else { |
2596 | dh_setup_group1(); |
2597 | kex_init_value = SSH2_MSG_KEXDH_INIT; |
2598 | kex_reply_value = SSH2_MSG_KEXDH_REPLY; |
8d5de777 |
2599 | } |
e5574168 |
2600 | |
a92dd380 |
2601 | logevent("Doing Diffie-Hellman key exchange"); |
e5574168 |
2602 | /* |
a92dd380 |
2603 | * Now generate and send e for Diffie-Hellman. |
e5574168 |
2604 | */ |
7bd5a860 |
2605 | e = dh_create_e(nbits*2); |
a92dd380 |
2606 | ssh2_pkt_init(kex_init_value); |
e5574168 |
2607 | ssh2_pkt_addmp(e); |
2608 | ssh2_pkt_send(); |
2609 | |
2610 | crWaitUntil(ispkt); |
a92dd380 |
2611 | if (pktin.type != kex_reply_value) { |
2612 | bombout(("expected key exchange reply packet from server")); |
8d5de777 |
2613 | crReturn(0); |
7cca0d81 |
2614 | } |
e5574168 |
2615 | ssh2_pkt_getstring(&hostkeydata, &hostkeylen); |
2616 | f = ssh2_pkt_getmp(); |
e5574168 |
2617 | ssh2_pkt_getstring(&sigdata, &siglen); |
2618 | |
2619 | K = dh_find_K(f); |
e5574168 |
2620 | |
2621 | sha_string(&exhash, hostkeydata, hostkeylen); |
a92dd380 |
2622 | if (kex == &ssh_diffiehellman_gex) { |
7bd5a860 |
2623 | sha_uint32(&exhash, pbits); |
a92dd380 |
2624 | sha_mpint(&exhash, p); |
2625 | sha_mpint(&exhash, g); |
2626 | } |
e5574168 |
2627 | sha_mpint(&exhash, e); |
2628 | sha_mpint(&exhash, f); |
2629 | sha_mpint(&exhash, K); |
2630 | SHA_Final(&exhash, exchange_hash); |
2631 | |
3709bfe9 |
2632 | dh_cleanup(); |
2633 | |
7cca0d81 |
2634 | #if 0 |
e5574168 |
2635 | debug(("Exchange hash is:\r\n")); |
2636 | for (i = 0; i < 20; i++) |
2637 | debug((" %02x", exchange_hash[i])); |
2638 | debug(("\r\n")); |
7cca0d81 |
2639 | #endif |
2640 | |
e055a386 |
2641 | hkey = hostkey->newkey(hostkeydata, hostkeylen); |
2642 | if (!hostkey->verifysig(hkey, sigdata, siglen, exchange_hash, 20)) { |
8d5de777 |
2643 | bombout(("Server failed host key check")); |
2644 | crReturn(0); |
2645 | } |
e5574168 |
2646 | |
2647 | /* |
7cca0d81 |
2648 | * Expect SSH2_MSG_NEWKEYS from server. |
d39f364a |
2649 | */ |
7cca0d81 |
2650 | crWaitUntil(ispkt); |
8d5de777 |
2651 | if (pktin.type != SSH2_MSG_NEWKEYS) { |
2652 | bombout(("expected new-keys packet from server")); |
2653 | crReturn(0); |
2654 | } |
d39f364a |
2655 | |
2656 | /* |
7cca0d81 |
2657 | * Authenticate remote host: verify host key. (We've already |
2658 | * checked the signature of the exchange hash.) |
e5574168 |
2659 | */ |
e055a386 |
2660 | keystr = hostkey->fmtkey(hkey); |
2661 | fingerprint = hostkey->fingerprint(hkey); |
d4857987 |
2662 | verify_ssh_host_key(savedhost, savedport, hostkey->keytype, |
2663 | keystr, fingerprint); |
a92dd380 |
2664 | if (first_kex) { /* don't bother logging this in rekeys */ |
5e0d7cb8 |
2665 | logevent("Host key fingerprint is:"); |
2666 | logevent(fingerprint); |
2667 | } |
dcbde236 |
2668 | sfree(fingerprint); |
2669 | sfree(keystr); |
e055a386 |
2670 | hostkey->freekey(hkey); |
d39f364a |
2671 | |
2672 | /* |
7cca0d81 |
2673 | * Send SSH2_MSG_NEWKEYS. |
d39f364a |
2674 | */ |
2675 | ssh2_pkt_init(SSH2_MSG_NEWKEYS); |
2676 | ssh2_pkt_send(); |
d39f364a |
2677 | |
2678 | /* |
2679 | * Create and initialise session keys. |
2680 | */ |
2681 | cscipher = cscipher_tobe; |
2682 | sccipher = sccipher_tobe; |
2683 | csmac = csmac_tobe; |
2684 | scmac = scmac_tobe; |
2685 | cscomp = cscomp_tobe; |
2686 | sccomp = sccomp_tobe; |
4ba9b64b |
2687 | cscomp->compress_init(); |
2688 | sccomp->decompress_init(); |
d39f364a |
2689 | /* |
5e0d7cb8 |
2690 | * Set IVs after keys. Here we use the exchange hash from the |
2691 | * _first_ key exchange. |
d39f364a |
2692 | */ |
5e0d7cb8 |
2693 | if (first_kex) |
65a22376 |
2694 | memcpy(ssh2_session_id, exchange_hash, sizeof(exchange_hash)); |
2695 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'C', keyspace); |
5e0d7cb8 |
2696 | cscipher->setcskey(keyspace); |
65a22376 |
2697 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'D', keyspace); |
5e0d7cb8 |
2698 | sccipher->setsckey(keyspace); |
65a22376 |
2699 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'A', keyspace); |
5e0d7cb8 |
2700 | cscipher->setcsiv(keyspace); |
65a22376 |
2701 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'B', keyspace); |
5e0d7cb8 |
2702 | sccipher->setsciv(keyspace); |
65a22376 |
2703 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'E', keyspace); |
5e0d7cb8 |
2704 | csmac->setcskey(keyspace); |
65a22376 |
2705 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'F', keyspace); |
5e0d7cb8 |
2706 | scmac->setsckey(keyspace); |
d39f364a |
2707 | |
033b4cef |
2708 | /* |
0db56f73 |
2709 | * If this is the first key exchange phase, we must pass the |
2710 | * SSH2_MSG_NEWKEYS packet to the next layer, not because it |
2711 | * wants to see it but because it will need time to initialise |
2712 | * itself before it sees an actual packet. In subsequent key |
2713 | * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because |
2714 | * it would only confuse the layer above. |
2715 | */ |
2716 | if (!first_kex) { |
2717 | crReturn(0); |
2718 | } |
2719 | first_kex = 0; |
2720 | |
2721 | /* |
7cca0d81 |
2722 | * Now we're encrypting. Begin returning 1 to the protocol main |
2723 | * function so that other things can run on top of the |
2724 | * transport. If we ever see a KEXINIT, we must go back to the |
2725 | * start. |
033b4cef |
2726 | */ |
e96adf72 |
2727 | while (!(ispkt && pktin.type == SSH2_MSG_KEXINIT)) { |
7cca0d81 |
2728 | crReturn(1); |
e96adf72 |
2729 | } |
5e0d7cb8 |
2730 | logevent("Server initiated key re-exchange"); |
7cca0d81 |
2731 | goto begin_key_exchange; |
e5574168 |
2732 | |
2733 | crFinish(1); |
2734 | } |
2735 | |
7cca0d81 |
2736 | /* |
783415f8 |
2737 | * Add data to an SSH2 channel output buffer. |
2738 | */ |
2739 | static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, int len) { |
2740 | if (c->v2.outbufsize < |
2741 | c->v2.outbuflen + len) { |
2742 | c->v2.outbufsize = |
2743 | c->v2.outbuflen + len + 1024; |
2744 | c->v2.outbuffer = srealloc(c->v2.outbuffer, |
2745 | c->v2.outbufsize); |
2746 | } |
2747 | memcpy(c->v2.outbuffer + c->v2.outbuflen, |
2748 | buf, len); |
2749 | c->v2.outbuflen += len; |
2750 | } |
2751 | |
2752 | /* |
2753 | * Attempt to send data on an SSH2 channel. |
2754 | */ |
2755 | static void ssh2_try_send(struct ssh_channel *c) { |
2756 | while (c->v2.remwindow > 0 && |
2757 | c->v2.outbuflen > 0) { |
2758 | unsigned len = c->v2.remwindow; |
2759 | if (len > c->v2.outbuflen) |
2760 | len = c->v2.outbuflen; |
2761 | if (len > c->v2.remmaxpkt) |
2762 | len = c->v2.remmaxpkt; |
2763 | ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA); |
2764 | ssh2_pkt_adduint32(c->remoteid); |
2765 | ssh2_pkt_addstring_start(); |
2766 | ssh2_pkt_addstring_data(c->v2.outbuffer, len); |
2767 | ssh2_pkt_send(); |
2768 | c->v2.outbuflen -= len; |
2769 | memmove(c->v2.outbuffer, c->v2.outbuffer+len, |
2770 | c->v2.outbuflen); |
2771 | c->v2.remwindow -= len; |
2772 | } |
2773 | } |
2774 | |
2775 | /* |
7cca0d81 |
2776 | * Handle the SSH2 userauth and connection layers. |
2777 | */ |
2778 | static void do_ssh2_authconn(unsigned char *in, int inlen, int ispkt) |
2779 | { |
7cca0d81 |
2780 | static unsigned long remote_winsize; |
2781 | static unsigned long remote_maxpkt; |
65a22376 |
2782 | static enum { |
2783 | AUTH_INVALID, AUTH_PUBLICKEY_AGENT, AUTH_PUBLICKEY_FILE, AUTH_PASSWORD |
2784 | } method; |
1408a877 |
2785 | static enum { |
2786 | AUTH_TYPE_NONE, |
2787 | AUTH_TYPE_PUBLICKEY, |
2788 | AUTH_TYPE_PUBLICKEY_OFFER_LOUD, |
2789 | AUTH_TYPE_PUBLICKEY_OFFER_QUIET, |
2790 | AUTH_TYPE_PASSWORD |
2791 | } type; |
1983e559 |
2792 | static int gotit, need_pw, can_pubkey, can_passwd; |
2793 | static int tried_pubkey_config, tried_agent; |
1408a877 |
2794 | static int we_are_in; |
65a22376 |
2795 | static char username[100]; |
2796 | static char pwprompt[200]; |
2797 | static char password[100]; |
7cca0d81 |
2798 | |
e5574168 |
2799 | crBegin; |
2800 | |
7cca0d81 |
2801 | /* |
2802 | * Request userauth protocol, and await a response to it. |
2803 | */ |
2804 | ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST); |
2805 | ssh2_pkt_addstring("ssh-userauth"); |
2806 | ssh2_pkt_send(); |
2807 | crWaitUntilV(ispkt); |
8d5de777 |
2808 | if (pktin.type != SSH2_MSG_SERVICE_ACCEPT) { |
2809 | bombout(("Server refused user authentication protocol")); |
2810 | crReturnV; |
2811 | } |
7cca0d81 |
2812 | |
2813 | /* |
1408a877 |
2814 | * We repeat this whole loop, including the username prompt, |
2815 | * until we manage a successful authentication. If the user |
2816 | * types the wrong _password_, they are sent back to the |
2817 | * beginning to try another username. (If they specify a |
2818 | * username in the config, they are never asked, even if they |
2819 | * do give a wrong password.) |
2820 | * |
2821 | * I think this best serves the needs of |
2822 | * |
2823 | * - the people who have no configuration, no keys, and just |
2824 | * want to try repeated (username,password) pairs until they |
2825 | * type both correctly |
2826 | * |
2827 | * - people who have keys and configuration but occasionally |
2828 | * need to fall back to passwords |
2829 | * |
2830 | * - people with a key held in Pageant, who might not have |
2831 | * logged in to a particular machine before; so they want to |
2832 | * type a username, and then _either_ their key will be |
2833 | * accepted, _or_ they will type a password. If they mistype |
2834 | * the username they will want to be able to get back and |
2835 | * retype it! |
7cca0d81 |
2836 | */ |
1408a877 |
2837 | do { |
2838 | static int pos; |
7cca0d81 |
2839 | static char c; |
e5574168 |
2840 | |
1408a877 |
2841 | /* |
2842 | * Get a username. |
2843 | */ |
2844 | pos = 0; |
67779be7 |
2845 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
1408a877 |
2846 | c_write_str("login as: "); |
65a22376 |
2847 | ssh_send_ok = 1; |
7cca0d81 |
2848 | while (pos >= 0) { |
2849 | crWaitUntilV(!ispkt); |
2850 | while (inlen--) switch (c = *in++) { |
2851 | case 10: case 13: |
2852 | username[pos] = 0; |
2853 | pos = -1; |
2854 | break; |
2855 | case 8: case 127: |
2856 | if (pos > 0) { |
1408a877 |
2857 | c_write_str("\b \b"); |
7cca0d81 |
2858 | pos--; |
2859 | } |
2860 | break; |
2861 | case 21: case 27: |
2862 | while (pos > 0) { |
1408a877 |
2863 | c_write_str("\b \b"); |
7cca0d81 |
2864 | pos--; |
2865 | } |
2866 | break; |
2867 | case 3: case 4: |
2868 | random_save_seed(); |
2869 | exit(0); |
2870 | break; |
2871 | default: |
2872 | if (((c >= ' ' && c <= '~') || |
65a22376 |
2873 | ((unsigned char)c >= 160)) && pos < 40) { |
7cca0d81 |
2874 | username[pos++] = c; |
2875 | c_write(&c, 1); |
2876 | } |
2877 | break; |
2878 | } |
2879 | } |
1408a877 |
2880 | c_write_str("\r\n"); |
7cca0d81 |
2881 | username[strcspn(username, "\n\r")] = '\0'; |
2882 | } else { |
2883 | char stuff[200]; |
2884 | strncpy(username, cfg.username, 99); |
2885 | username[99] = '\0'; |
65a22376 |
2886 | if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) { |
7cca0d81 |
2887 | sprintf(stuff, "Using username \"%s\".\r\n", username); |
1408a877 |
2888 | c_write_str(stuff); |
7cca0d81 |
2889 | } |
2890 | } |
2891 | |
65a22376 |
2892 | /* |
1408a877 |
2893 | * Send an authentication request using method "none": (a) |
2894 | * just in case it succeeds, and (b) so that we know what |
2895 | * authentication methods we can usefully try next. |
65a22376 |
2896 | */ |
1408a877 |
2897 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
2898 | ssh2_pkt_addstring(username); |
2899 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
2900 | ssh2_pkt_addstring("none"); /* method */ |
2901 | ssh2_pkt_send(); |
2902 | type = AUTH_TYPE_NONE; |
2903 | gotit = FALSE; |
2904 | we_are_in = FALSE; |
7cca0d81 |
2905 | |
1408a877 |
2906 | tried_pubkey_config = FALSE; |
1983e559 |
2907 | tried_agent = FALSE; |
65a22376 |
2908 | |
1408a877 |
2909 | while (1) { |
2910 | /* |
2911 | * Wait for the result of the last authentication request. |
2912 | */ |
2913 | if (!gotit) |
2914 | crWaitUntilV(ispkt); |
2915 | while (pktin.type == SSH2_MSG_USERAUTH_BANNER) { |
2916 | /* FIXME: should support this */ |
2917 | crWaitUntilV(ispkt); |
2918 | } |
2919 | if (pktin.type == SSH2_MSG_USERAUTH_SUCCESS) { |
2920 | logevent("Access granted"); |
2921 | we_are_in = TRUE; |
2922 | break; |
2923 | } |
65a22376 |
2924 | |
1408a877 |
2925 | if (pktin.type != SSH2_MSG_USERAUTH_FAILURE) { |
2926 | bombout(("Strange packet received during authentication: type %d", |
2927 | pktin.type)); |
65a22376 |
2928 | } |
2929 | |
1408a877 |
2930 | gotit = FALSE; |
65a22376 |
2931 | |
1408a877 |
2932 | /* |
2933 | * OK, we're now sitting on a USERAUTH_FAILURE message, so |
2934 | * we can look at the string in it and know what we can |
2935 | * helpfully try next. |
2936 | */ |
2937 | { |
2938 | char *methods; |
2939 | int methlen; |
2940 | ssh2_pkt_getstring(&methods, &methlen); |
2941 | if (!ssh2_pkt_getbool()) { |
2942 | /* |
2943 | * We have received an unequivocal Access |
2944 | * Denied. This can translate to a variety of |
2945 | * messages: |
2946 | * |
2947 | * - if we'd just tried "none" authentication, |
2948 | * it's not worth printing anything at all |
2949 | * |
2950 | * - if we'd just tried a public key _offer_, |
2951 | * the message should be "Server refused our |
2952 | * key" (or no message at all if the key |
2953 | * came from Pageant) |
2954 | * |
2955 | * - if we'd just tried anything else, the |
2956 | * message really should be "Access denied". |
2957 | * |
2958 | * Additionally, if we'd just tried password |
2959 | * authentication, we should break out of this |
2960 | * whole loop so as to go back to the username |
2961 | * prompt. |
2962 | */ |
2963 | if (type == AUTH_TYPE_NONE) { |
2964 | /* do nothing */ |
2965 | } else if (type == AUTH_TYPE_PUBLICKEY_OFFER_LOUD || |
2966 | type == AUTH_TYPE_PUBLICKEY_OFFER_QUIET) { |
2967 | if (type == AUTH_TYPE_PUBLICKEY_OFFER_LOUD) |
2968 | c_write_str("Server refused our key\r\n"); |
2969 | logevent("Server refused public key"); |
2970 | } else { |
2971 | c_write_str("Access denied\r\n"); |
2972 | logevent("Access denied"); |
2973 | if (type == AUTH_TYPE_PASSWORD) { |
2974 | we_are_in = FALSE; |
2975 | break; |
2976 | } |
2977 | } |
2978 | } else { |
2979 | c_write_str("Further authentication required\r\n"); |
2980 | logevent("Further authentication required"); |
2981 | } |
65a22376 |
2982 | |
1408a877 |
2983 | can_pubkey = in_commasep_string("publickey", methods, methlen); |
2984 | can_passwd = in_commasep_string("password", methods, methlen); |
2985 | } |
65a22376 |
2986 | |
1408a877 |
2987 | method = 0; |
65a22376 |
2988 | |
1983e559 |
2989 | if (!method && can_pubkey && agent_exists && !tried_agent) { |
2990 | /* |
2991 | * Attempt public-key authentication using Pageant. |
2992 | */ |
2993 | static unsigned char request[5], *response, *p; |
2994 | static int responselen; |
2995 | static int i, nkeys; |
2996 | static int authed = FALSE; |
2997 | void *r; |
2998 | |
2999 | tried_agent = TRUE; |
3000 | |
3001 | logevent("Pageant is running. Requesting keys."); |
3002 | |
3003 | /* Request the keys held by the agent. */ |
3004 | PUT_32BIT(request, 1); |
3005 | request[4] = SSH2_AGENTC_REQUEST_IDENTITIES; |
3006 | agent_query(request, 5, &r, &responselen); |
3007 | response = (unsigned char *)r; |
3008 | if (response) { |
3009 | p = response + 5; |
3010 | nkeys = GET_32BIT(p); p += 4; |
6328ea7a |
3011 | { char buf[64]; sprintf(buf, "Pageant has %d SSH2 keys", nkeys); |
1983e559 |
3012 | logevent(buf); } |
3013 | for (i = 0; i < nkeys; i++) { |
3014 | static char *pkblob, *alg, *commentp; |
3015 | static int pklen, alglen, commentlen; |
3016 | static int siglen, retlen, len; |
3017 | static char *q, *agentreq, *ret; |
3018 | |
3019 | { char buf[64]; sprintf(buf, "Trying Pageant key #%d", i); |
3020 | logevent(buf); } |
3021 | pklen = GET_32BIT(p); p += 4; |
3022 | pkblob = p; p += pklen; |
3023 | alglen = GET_32BIT(pkblob); |
3024 | alg = pkblob + 4; |
3025 | commentlen = GET_32BIT(p); p += 4; |
3026 | commentp = p; p += commentlen; |
3027 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
3028 | ssh2_pkt_addstring(username); |
3029 | ssh2_pkt_addstring("ssh-connection");/* service requested */ |
3030 | ssh2_pkt_addstring("publickey");/* method */ |
3031 | ssh2_pkt_addbool(FALSE); /* no signature included */ |
3032 | ssh2_pkt_addstring_start(); |
3033 | ssh2_pkt_addstring_data(alg, alglen); |
3034 | ssh2_pkt_addstring_start(); |
3035 | ssh2_pkt_addstring_data(pkblob, pklen); |
3036 | ssh2_pkt_send(); |
3037 | |
3038 | crWaitUntilV(ispkt); |
3039 | if (pktin.type != SSH2_MSG_USERAUTH_PK_OK) { |
3040 | logevent("Key refused"); |
3041 | continue; |
3042 | } |
3043 | |
3044 | c_write_str("Authenticating with public key \""); |
3045 | c_write(commentp, commentlen); |
3046 | c_write_str("\" from agent\r\n"); |
3047 | |
3048 | /* |
3049 | * Server is willing to accept the key. |
3050 | * Construct a SIGN_REQUEST. |
3051 | */ |
3052 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
3053 | ssh2_pkt_addstring(username); |
3054 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
3055 | ssh2_pkt_addstring("publickey"); /* method */ |
3056 | ssh2_pkt_addbool(TRUE); |
3057 | ssh2_pkt_addstring_start(); |
3058 | ssh2_pkt_addstring_data(alg, alglen); |
3059 | ssh2_pkt_addstring_start(); |
3060 | ssh2_pkt_addstring_data(pkblob, pklen); |
3061 | |
3062 | siglen = pktout.length - 5 + 4 + 20; |
3063 | len = 1; /* message type */ |
3064 | len += 4 + pklen; /* key blob */ |
3065 | len += 4 + siglen; /* data to sign */ |
3066 | len += 4; /* flags */ |
3067 | agentreq = smalloc(4 + len); |
3068 | PUT_32BIT(agentreq, len); |
3069 | q = agentreq + 4; |
3070 | *q++ = SSH2_AGENTC_SIGN_REQUEST; |
3071 | PUT_32BIT(q, pklen); q += 4; |
3072 | memcpy(q, pkblob, pklen); q += pklen; |
3073 | PUT_32BIT(q, siglen); q += 4; |
3074 | /* Now the data to be signed... */ |
3075 | PUT_32BIT(q, 20); q += 4; |
3076 | memcpy(q, ssh2_session_id, 20); q += 20; |
3077 | memcpy(q, pktout.data+5, pktout.length-5); |
3078 | q += pktout.length-5; |
3079 | /* And finally the (zero) flags word. */ |
3080 | PUT_32BIT(q, 0); |
3081 | agent_query(agentreq, len+4, &ret, &retlen); |
3082 | sfree(agentreq); |
3083 | if (ret) { |
3084 | if (ret[4] == SSH2_AGENT_SIGN_RESPONSE) { |
3085 | logevent("Sending Pageant's response"); |
3086 | ssh2_pkt_addstring_start(); |
3087 | ssh2_pkt_addstring_data(ret+9, GET_32BIT(ret+5)); |
3088 | ssh2_pkt_send(); |
3089 | authed = TRUE; |
3090 | break; |
3091 | } else { |
3092 | logevent("Pageant failed to answer challenge"); |
3093 | sfree(ret); |
3094 | } |
3095 | } |
3096 | } |
3097 | if (authed) |
3098 | continue; |
3099 | } |
3100 | } |
3101 | |
1408a877 |
3102 | if (!method && can_pubkey && *cfg.keyfile && !tried_pubkey_config) { |
3103 | unsigned char *pub_blob; |
3104 | char *algorithm, *comment; |
3105 | int pub_blob_len; |
65a22376 |
3106 | |
1408a877 |
3107 | tried_pubkey_config = TRUE; |
65a22376 |
3108 | |
65a22376 |
3109 | /* |
1408a877 |
3110 | * Try the public key supplied in the configuration. |
3111 | * |
3112 | * First, offer the public blob to see if the server is |
3113 | * willing to accept it. |
65a22376 |
3114 | */ |
1408a877 |
3115 | pub_blob = ssh2_userkey_loadpub(cfg.keyfile, &algorithm, |
3116 | &pub_blob_len); |
3117 | if (pub_blob) { |
3118 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
3119 | ssh2_pkt_addstring(username); |
3120 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
3121 | ssh2_pkt_addstring("publickey");/* method */ |
3122 | ssh2_pkt_addbool(FALSE); /* no signature included */ |
3123 | ssh2_pkt_addstring(algorithm); |
3124 | ssh2_pkt_addstring_start(); |
3125 | ssh2_pkt_addstring_data(pub_blob, pub_blob_len); |
3126 | ssh2_pkt_send(); |
3127 | logevent("Offered public key"); /* FIXME */ |
3128 | |
3129 | crWaitUntilV(ispkt); |
3130 | if (pktin.type != SSH2_MSG_USERAUTH_PK_OK) { |
3131 | gotit = TRUE; |
3132 | type = AUTH_TYPE_PUBLICKEY_OFFER_LOUD; |
3133 | continue; /* key refused; give up on it */ |
3134 | } |
65a22376 |
3135 | |
1408a877 |
3136 | logevent("Offer of public key accepted"); |
65a22376 |
3137 | /* |
1408a877 |
3138 | * Actually attempt a serious authentication using |
3139 | * the key. |
65a22376 |
3140 | */ |
1408a877 |
3141 | if (ssh2_userkey_encrypted(cfg.keyfile, &comment)) { |
3142 | sprintf(pwprompt, "Passphrase for key \"%.100s\": ", comment); |
3143 | need_pw = TRUE; |
3144 | } else { |
3145 | need_pw = FALSE; |
3146 | } |
3147 | c_write_str("Authenticating with public key \""); |
3148 | c_write_str(comment); |
3149 | c_write_str("\"\r\n"); |
3150 | method = AUTH_PUBLICKEY_FILE; |
65a22376 |
3151 | } |
1408a877 |
3152 | } |
3153 | |
3154 | if (!method && can_passwd) { |
3155 | method = AUTH_PASSWORD; |
3156 | sprintf(pwprompt, "%.90s@%.90s's password: ", username, savedhost); |
3157 | need_pw = TRUE; |
3158 | } |
3159 | |
3160 | if (need_pw) { |
3161 | if (ssh_get_password) { |
3162 | if (!ssh_get_password(pwprompt, password, sizeof(password))) { |
3163 | /* |
3164 | * get_password failed to get a password (for |
3165 | * example because one was supplied on the command |
3166 | * line which has already failed to work). |
3167 | * Terminate. |
3168 | */ |
3169 | logevent("No more passwords to try"); |
3170 | ssh_state = SSH_STATE_CLOSED; |
3171 | crReturnV; |
3172 | } |
3173 | } else { |
3174 | static int pos = 0; |
3175 | static char c; |
3176 | |
3177 | c_write_str(pwprompt); |
3178 | ssh_send_ok = 1; |
3179 | |
3180 | pos = 0; |
3181 | while (pos >= 0) { |
3182 | crWaitUntilV(!ispkt); |
3183 | while (inlen--) switch (c = *in++) { |
3184 | case 10: case 13: |
3185 | password[pos] = 0; |
3186 | pos = -1; |
3187 | break; |
3188 | case 8: case 127: |
3189 | if (pos > 0) |
3190 | pos--; |
3191 | break; |
3192 | case 21: case 27: |
3193 | pos = 0; |
3194 | break; |
3195 | case 3: case 4: |
3196 | random_save_seed(); |
3197 | exit(0); |
3198 | break; |
3199 | default: |
3200 | if (((c >= ' ' && c <= '~') || |
3201 | ((unsigned char)c >= 160)) && pos < 40) |
3202 | password[pos++] = c; |
3203 | break; |
3204 | } |
65a22376 |
3205 | } |
1408a877 |
3206 | c_write_str("\r\n"); |
65a22376 |
3207 | } |
65a22376 |
3208 | } |
65a22376 |
3209 | |
1408a877 |
3210 | if (method == AUTH_PUBLICKEY_FILE) { |
3211 | /* |
3212 | * We have our passphrase. Now try the actual authentication. |
3213 | */ |
3214 | struct ssh2_userkey *key; |
65a22376 |
3215 | |
1408a877 |
3216 | key = ssh2_load_userkey(cfg.keyfile, password); |
3217 | if (key == SSH2_WRONG_PASSPHRASE || key == NULL) { |
3218 | if (key == SSH2_WRONG_PASSPHRASE) { |
3219 | c_write_str("Wrong passphrase\r\n"); |
3220 | tried_pubkey_config = FALSE; |
3221 | } else { |
3222 | c_write_str("Unable to load private key\r\n"); |
3223 | tried_pubkey_config = TRUE; |
3224 | } |
3225 | /* Send a spurious AUTH_NONE to return to the top. */ |
3226 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
3227 | ssh2_pkt_addstring(username); |
3228 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
3229 | ssh2_pkt_addstring("none"); /* method */ |
3230 | ssh2_pkt_send(); |
3231 | type = AUTH_TYPE_NONE; |
3232 | } else { |
3233 | unsigned char *blob, *sigdata; |
3234 | int blob_len, sigdata_len; |
65a22376 |
3235 | |
1408a877 |
3236 | /* |
3237 | * We have loaded the private key and the server |
3238 | * has announced that it's willing to accept it. |
3239 | * Hallelujah. Generate a signature and send it. |
3240 | */ |
3241 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
3242 | ssh2_pkt_addstring(username); |
3243 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
3244 | ssh2_pkt_addstring("publickey"); /* method */ |
3245 | ssh2_pkt_addbool(TRUE); |
3246 | ssh2_pkt_addstring(key->alg->name); |
3247 | blob = key->alg->public_blob(key->data, &blob_len); |
3248 | ssh2_pkt_addstring_start(); |
3249 | ssh2_pkt_addstring_data(blob, blob_len); |
3250 | sfree(blob); |
3251 | |
3252 | /* |
3253 | * The data to be signed is: |
3254 | * |
3255 | * string session-id |
3256 | * |
3257 | * followed by everything so far placed in the |
3258 | * outgoing packet. |
3259 | */ |
3260 | sigdata_len = pktout.length - 5 + 4 + 20; |
3261 | sigdata = smalloc(sigdata_len); |
3262 | PUT_32BIT(sigdata, 20); |
3263 | memcpy(sigdata+4, ssh2_session_id, 20); |
3264 | memcpy(sigdata+24, pktout.data+5, pktout.length-5); |
3265 | blob = key->alg->sign(key->data, sigdata, sigdata_len, &blob_len); |
3266 | ssh2_pkt_addstring_start(); |
3267 | ssh2_pkt_addstring_data(blob, blob_len); |
3268 | sfree(blob); |
3269 | sfree(sigdata); |
3270 | |
3271 | ssh2_pkt_send(); |
3272 | type = AUTH_TYPE_PUBLICKEY; |
3273 | } |
3274 | } else if (method == AUTH_PASSWORD) { |
65a22376 |
3275 | /* |
1408a877 |
3276 | * We send the password packet lumped tightly together with |
3277 | * an SSH_MSG_IGNORE packet. The IGNORE packet contains a |
3278 | * string long enough to make the total length of the two |
3279 | * packets constant. This should ensure that a passive |
3280 | * listener doing traffic analyis can't work out the length |
3281 | * of the password. |
3282 | * |
3283 | * For this to work, we need an assumption about the |
3284 | * maximum length of the password packet. I think 256 is |
3285 | * pretty conservative. Anyone using a password longer than |
3286 | * that probably doesn't have much to worry about from |
3287 | * people who find out how long their password is! |
65a22376 |
3288 | */ |
3289 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
3290 | ssh2_pkt_addstring(username); |
3291 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
1408a877 |
3292 | ssh2_pkt_addstring("password"); |
3293 | ssh2_pkt_addbool(FALSE); |
3294 | ssh2_pkt_addstring(password); |
3295 | ssh2_pkt_defer(); |
65a22376 |
3296 | /* |
1408a877 |
3297 | * We'll include a string that's an exact multiple of the |
3298 | * cipher block size. If the cipher is NULL for some |
3299 | * reason, we don't do this trick at all because we gain |
3300 | * nothing by it. |
65a22376 |
3301 | */ |
6e9e9520 |
3302 | if (cscipher) { |
3303 | int stringlen, i; |
3304 | |
3305 | stringlen = (256 - deferred_len); |
3306 | stringlen += cscipher->blksize - 1; |
3307 | stringlen -= (stringlen % cscipher->blksize); |
3308 | if (cscomp) { |
3309 | /* |
3310 | * Temporarily disable actual compression, |
3311 | * so we can guarantee to get this string |
3312 | * exactly the length we want it. The |
3313 | * compression-disabling routine should |
3314 | * return an integer indicating how many |
3315 | * bytes we should adjust our string length |
3316 | * by. |
3317 | */ |
3318 | stringlen -= cscomp->disable_compression(); |
3319 | } |
1408a877 |
3320 | ssh2_pkt_init(SSH2_MSG_IGNORE); |
3321 | ssh2_pkt_addstring_start(); |
6e9e9520 |
3322 | for (i = 0; i < stringlen; i++) { |
3323 | char c = (char)random_byte(); |
3324 | ssh2_pkt_addstring_data(&c, 1); |
65a22376 |
3325 | } |
1408a877 |
3326 | ssh2_pkt_defer(); |
65a22376 |
3327 | } |
39065bed |
3328 | ssh_pkt_defersend(); |
0d43337a |
3329 | logevent("Sent password"); |
1408a877 |
3330 | type = AUTH_TYPE_PASSWORD; |
3331 | } else { |
3332 | c_write_str("No supported authentication methods left to try!\r\n"); |
3333 | logevent("No supported authentications offered. Disconnecting"); |
3334 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
3335 | ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION); |
3336 | ssh2_pkt_addstring("No supported authentication methods available"); |
3337 | ssh2_pkt_addstring("en"); /* language tag */ |
3338 | ssh2_pkt_send(); |
3339 | ssh_state = SSH_STATE_CLOSED; |
3340 | crReturnV; |
65a22376 |
3341 | } |
65a22376 |
3342 | } |
1408a877 |
3343 | } while (!we_are_in); |
7cca0d81 |
3344 | |
3345 | /* |
3346 | * Now we're authenticated for the connection protocol. The |
3347 | * connection protocol will automatically have started at this |
3348 | * point; there's no need to send SERVICE_REQUEST. |
3349 | */ |
3350 | |
3351 | /* |
3352 | * So now create a channel with a session in it. |
3353 | */ |
dcbde236 |
3354 | mainchan = smalloc(sizeof(struct ssh_channel)); |
d211621f |
3355 | mainchan->localid = 100; /* as good as any */ |
7cca0d81 |
3356 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
3357 | ssh2_pkt_addstring("session"); |
d211621f |
3358 | ssh2_pkt_adduint32(mainchan->localid); |
cf6e59d6 |
3359 | ssh2_pkt_adduint32(0x8000UL); /* our window size */ |
d211621f |
3360 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
7cca0d81 |
3361 | ssh2_pkt_send(); |
3362 | crWaitUntilV(ispkt); |
3363 | if (pktin.type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) { |
8d5de777 |
3364 | bombout(("Server refused to open a session")); |
3365 | crReturnV; |
7cca0d81 |
3366 | /* FIXME: error data comes back in FAILURE packet */ |
3367 | } |
d211621f |
3368 | if (ssh2_pkt_getuint32() != mainchan->localid) { |
8d5de777 |
3369 | bombout(("Server's channel confirmation cited wrong channel")); |
3370 | crReturnV; |
7cca0d81 |
3371 | } |
d211621f |
3372 | mainchan->remoteid = ssh2_pkt_getuint32(); |
783415f8 |
3373 | mainchan->type = CHAN_MAINSESSION; |
3374 | mainchan->closes = 0; |
3375 | mainchan->v2.remwindow = ssh2_pkt_getuint32(); |
3376 | mainchan->v2.remmaxpkt = ssh2_pkt_getuint32(); |
3377 | mainchan->v2.outbuffer = NULL; |
3378 | mainchan->v2.outbuflen = mainchan->v2.outbufsize = 0; |
3379 | ssh_channels = newtree234(ssh_channelcmp); |
3380 | add234(ssh_channels, mainchan); |
7cca0d81 |
3381 | logevent("Opened channel for session"); |
3382 | |
3383 | /* |
783415f8 |
3384 | * Potentially enable X11 forwarding. |
3385 | */ |
3386 | if (cfg.x11_forward) { |
3387 | char proto[20], data[64]; |
3388 | logevent("Requesting X11 forwarding"); |
3389 | x11_invent_auth(proto, sizeof(proto), data, sizeof(data)); |
3390 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
3391 | ssh2_pkt_adduint32(mainchan->remoteid); |
3392 | ssh2_pkt_addstring("x11-req"); |
3393 | ssh2_pkt_addbool(1); /* want reply */ |
3394 | ssh2_pkt_addbool(0); /* many connections */ |
3395 | ssh2_pkt_addstring(proto); |
3396 | ssh2_pkt_addstring(data); |
3397 | ssh2_pkt_adduint32(0); /* screen number */ |
3398 | ssh2_pkt_send(); |
3399 | |
3400 | do { |
3401 | crWaitUntilV(ispkt); |
3402 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
3403 | unsigned i = ssh2_pkt_getuint32(); |
3404 | struct ssh_channel *c; |
3405 | c = find234(ssh_channels, &i, ssh_channelfind); |
3406 | if (!c) |
3407 | continue; /* nonexistent channel */ |
3408 | c->v2.remwindow += ssh2_pkt_getuint32(); |
3409 | } |
3410 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
3411 | |
3412 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
3413 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
3414 | bombout(("Server got confused by X11 forwarding request")); |
3415 | crReturnV; |
3416 | } |
3417 | logevent("X11 forwarding refused"); |
3418 | } else { |
3419 | logevent("X11 forwarding enabled"); |
3420 | ssh_X11_fwd_enabled = TRUE; |
3421 | } |
3422 | } |
3423 | |
3424 | /* |
36c2a3e9 |
3425 | * Potentially enable agent forwarding. |
3426 | */ |
3427 | if (cfg.agentfwd && agent_exists()) { |
3428 | char proto[20], data[64]; |
3429 | logevent("Requesting OpenSSH-style agent forwarding"); |
3430 | x11_invent_auth(proto, sizeof(proto), data, sizeof(data)); |
3431 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
3432 | ssh2_pkt_adduint32(mainchan->remoteid); |
3433 | ssh2_pkt_addstring("auth-agent-req@openssh.com"); |
3434 | ssh2_pkt_addbool(1); /* want reply */ |
3435 | ssh2_pkt_send(); |
3436 | |
3437 | do { |
3438 | crWaitUntilV(ispkt); |
3439 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
3440 | unsigned i = ssh2_pkt_getuint32(); |
3441 | struct ssh_channel *c; |
3442 | c = find234(ssh_channels, &i, ssh_channelfind); |
3443 | if (!c) |
3444 | continue; /* nonexistent channel */ |
3445 | c->v2.remwindow += ssh2_pkt_getuint32(); |
3446 | } |
3447 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
3448 | |
3449 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
3450 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
3451 | bombout(("Server got confused by agent forwarding request")); |
3452 | crReturnV; |
3453 | } |
3454 | logevent("Agent forwarding refused"); |
3455 | } else { |
3456 | logevent("Agent forwarding enabled"); |
3457 | ssh_agentfwd_enabled = TRUE; |
3458 | } |
3459 | } |
3460 | |
3461 | /* |
7cca0d81 |
3462 | * Now allocate a pty for the session. |
3463 | */ |
67779be7 |
3464 | if (!cfg.nopty) { |
3465 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
3466 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
3467 | ssh2_pkt_addstring("pty-req"); |
3468 | ssh2_pkt_addbool(1); /* want reply */ |
3469 | ssh2_pkt_addstring(cfg.termtype); |
3470 | ssh2_pkt_adduint32(cols); |
3471 | ssh2_pkt_adduint32(rows); |
3472 | ssh2_pkt_adduint32(0); /* pixel width */ |
3473 | ssh2_pkt_adduint32(0); /* pixel height */ |
3474 | ssh2_pkt_addstring_start(); |
3475 | ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */ |
3476 | ssh2_pkt_send(); |
6e48c3fe |
3477 | ssh_state = SSH_STATE_INTERMED; |
7cca0d81 |
3478 | |
67779be7 |
3479 | do { |
3480 | crWaitUntilV(ispkt); |
3481 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
783415f8 |
3482 | unsigned i = ssh2_pkt_getuint32(); |
3483 | struct ssh_channel *c; |
3484 | c = find234(ssh_channels, &i, ssh_channelfind); |
3485 | if (!c) |
3486 | continue; /* nonexistent channel */ |
3487 | c->v2.remwindow += ssh2_pkt_getuint32(); |
67779be7 |
3488 | } |
3489 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
7cca0d81 |
3490 | |
67779be7 |
3491 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
3492 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
3493 | bombout(("Server got confused by pty request")); |
3494 | crReturnV; |
67779be7 |
3495 | } |
1408a877 |
3496 | c_write_str("Server refused to allocate pty\r\n"); |
0965bee0 |
3497 | ssh_editing = ssh_echoing = 1; |
67779be7 |
3498 | } else { |
3499 | logevent("Allocated pty"); |
7cca0d81 |
3500 | } |
0965bee0 |
3501 | } else { |
3502 | ssh_editing = ssh_echoing = 1; |
7cca0d81 |
3503 | } |
3504 | |
3505 | /* |
67779be7 |
3506 | * Start a shell or a remote command. |
7cca0d81 |
3507 | */ |
3508 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
d211621f |
3509 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
4a8fc3c4 |
3510 | if (cfg.ssh_subsys) { |
3511 | ssh2_pkt_addstring("subsystem"); |
3512 | ssh2_pkt_addbool(1); /* want reply */ |
3513 | ssh2_pkt_addstring(cfg.remote_cmd); |
3514 | } else if (*cfg.remote_cmd) { |
67779be7 |
3515 | ssh2_pkt_addstring("exec"); |
3516 | ssh2_pkt_addbool(1); /* want reply */ |
3517 | ssh2_pkt_addstring(cfg.remote_cmd); |
3518 | } else { |
3519 | ssh2_pkt_addstring("shell"); |
3520 | ssh2_pkt_addbool(1); /* want reply */ |
3521 | } |
7cca0d81 |
3522 | ssh2_pkt_send(); |
d211621f |
3523 | do { |
7cca0d81 |
3524 | crWaitUntilV(ispkt); |
d211621f |
3525 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
783415f8 |
3526 | unsigned i = ssh2_pkt_getuint32(); |
3527 | struct ssh_channel *c; |
3528 | c = find234(ssh_channels, &i, ssh_channelfind); |
3529 | if (!c) |
3530 | continue; /* nonexistent channel */ |
3531 | c->v2.remwindow += ssh2_pkt_getuint32(); |
d211621f |
3532 | } |
7cca0d81 |
3533 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
3534 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
3535 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
3536 | bombout(("Server got confused by shell/command request")); |
3537 | crReturnV; |
7cca0d81 |
3538 | } |
8d5de777 |
3539 | bombout(("Server refused to start a shell/command")); |
3540 | crReturnV; |
7cca0d81 |
3541 | } else { |
8d5de777 |
3542 | logevent("Started a shell/command"); |
7cca0d81 |
3543 | } |
3544 | |
6e48c3fe |
3545 | ssh_state = SSH_STATE_SESSION; |
3546 | if (size_needed) |
3547 | ssh_size(); |
3687d221 |
3548 | if (eof_needed) |
3549 | ssh_special(TS_EOF); |
6e48c3fe |
3550 | |
7cca0d81 |
3551 | /* |
3552 | * Transfer data! |
3553 | */ |
0965bee0 |
3554 | ldisc_send(NULL, 0); /* cause ldisc to notice changes */ |
8ccc75b0 |
3555 | ssh_send_ok = 1; |
7cca0d81 |
3556 | while (1) { |
d211621f |
3557 | static int try_send; |
e5574168 |
3558 | crReturnV; |
d211621f |
3559 | try_send = FALSE; |
7cca0d81 |
3560 | if (ispkt) { |
3561 | if (pktin.type == SSH2_MSG_CHANNEL_DATA || |
3562 | pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA) { |
3563 | char *data; |
3564 | int length; |
783415f8 |
3565 | unsigned i = ssh2_pkt_getuint32(); |
3566 | struct ssh_channel *c; |
3567 | c = find234(ssh_channels, &i, ssh_channelfind); |
3568 | if (!c) |
3569 | continue; /* nonexistent channel */ |
7cca0d81 |
3570 | if (pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA && |
3571 | ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR) |
3572 | continue; /* extended but not stderr */ |
3573 | ssh2_pkt_getstring(&data, &length); |
d211621f |
3574 | if (data) { |
783415f8 |
3575 | switch (c->type) { |
3576 | case CHAN_MAINSESSION: |
3577 | from_backend(pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA, |
3578 | data, length); |
3579 | break; |
3580 | case CHAN_X11: |
3581 | x11_send(c->u.x11.s, data, length); |
3582 | break; |
36c2a3e9 |
3583 | case CHAN_AGENT: |
3584 | while (length > 0) { |
3585 | if (c->u.a.lensofar < 4) { |
3586 | int l = min(4 - c->u.a.lensofar, length); |
3587 | memcpy(c->u.a.msglen + c->u.a.lensofar, data, l); |
3588 | data += l; length -= l; c->u.a.lensofar += l; |
3589 | } |
3590 | if (c->u.a.lensofar == 4) { |
3591 | c->u.a.totallen = 4 + GET_32BIT(c->u.a.msglen); |
3592 | c->u.a.message = smalloc(c->u.a.totallen); |
3593 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
3594 | } |
3595 | if (c->u.a.lensofar >= 4 && length > 0) { |
3596 | int l = min(c->u.a.totallen - c->u.a.lensofar, |
3597 | length); |
3598 | memcpy(c->u.a.message + c->u.a.lensofar, data, l); |
3599 | data += l; length -= l; c->u.a.lensofar += l; |
3600 | } |
3601 | if (c->u.a.lensofar == c->u.a.totallen) { |
3602 | void *reply, *sentreply; |
3603 | int replylen; |
3604 | agent_query(c->u.a.message, c->u.a.totallen, |
3605 | &reply, &replylen); |
3606 | if (reply) |
3607 | sentreply = reply; |
3608 | else { |
3609 | /* Fake SSH_AGENT_FAILURE. */ |
3610 | sentreply = "\0\0\0\1\5"; |
3611 | replylen = 5; |
3612 | } |
3613 | ssh2_add_channel_data(c, sentreply, replylen); |
3614 | try_send = TRUE; |
3615 | if (reply) |
3616 | sfree(reply); |
3617 | sfree(c->u.a.message); |
3618 | c->u.a.lensofar = 0; |
3619 | } |
3620 | } |
3621 | break; |
783415f8 |
3622 | } |
d211621f |
3623 | /* |
783415f8 |
3624 | * Enlarge the window again at the remote |
3625 | * side, just in case it ever runs down and |
3626 | * they fail to send us any more data. |
d211621f |
3627 | */ |
3628 | ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
783415f8 |
3629 | ssh2_pkt_adduint32(c->remoteid); |
d211621f |
3630 | ssh2_pkt_adduint32(length); |
3631 | ssh2_pkt_send(); |
3632 | } |
7cca0d81 |
3633 | } else if (pktin.type == SSH2_MSG_DISCONNECT) { |
3634 | ssh_state = SSH_STATE_CLOSED; |
d211621f |
3635 | logevent("Received disconnect message"); |
3257deae |
3636 | crReturnV; |
7cca0d81 |
3637 | } else if (pktin.type == SSH2_MSG_CHANNEL_REQUEST) { |
3638 | continue; /* exit status et al; ignore (FIXME?) */ |
d211621f |
3639 | } else if (pktin.type == SSH2_MSG_CHANNEL_EOF) { |
783415f8 |
3640 | unsigned i = ssh2_pkt_getuint32(); |
3641 | struct ssh_channel *c; |
3642 | |
3643 | c = find234(ssh_channels, &i, ssh_channelfind); |
3644 | if (!c) |
3645 | continue; /* nonexistent channel */ |
3646 | |
3647 | if (c->type == CHAN_X11) { |
3648 | /* |
3649 | * Remote EOF on an X11 channel means we should |
3650 | * wrap up and close the channel ourselves. |
3651 | */ |
3652 | x11_close(c->u.x11.s); |
3653 | sshfwd_close(c); |
36c2a3e9 |
3654 | } else if (c->type == CHAN_AGENT) { |
3655 | sshfwd_close(c); |
3656 | } |
d211621f |
3657 | } else if (pktin.type == SSH2_MSG_CHANNEL_CLOSE) { |
783415f8 |
3658 | unsigned i = ssh2_pkt_getuint32(); |
3659 | struct ssh_channel *c; |
3660 | enum234 e; |
3661 | |
3662 | c = find234(ssh_channels, &i, ssh_channelfind); |
3663 | if (!c) |
3664 | continue; /* nonexistent channel */ |
3665 | if (c->closes == 0) { |
3666 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
3667 | ssh2_pkt_adduint32(c->remoteid); |
3668 | ssh2_pkt_send(); |
3669 | } |
3670 | /* Do pre-close processing on the channel. */ |
3671 | switch (c->type) { |
3672 | case CHAN_MAINSESSION: |
3673 | break; /* nothing to see here, move along */ |
3674 | case CHAN_X11: |
3675 | break; |
36c2a3e9 |
3676 | case CHAN_AGENT: |
3677 | break; |
783415f8 |
3678 | } |
3679 | del234(ssh_channels, c); |
3680 | sfree(c->v2.outbuffer); |
3681 | sfree(c); |
3682 | |
3683 | /* |
3684 | * See if that was the last channel left open. |
3685 | */ |
3686 | c = first234(ssh_channels, &e); |
3687 | if (!c) { |
d211621f |
3688 | logevent("All channels closed. Disconnecting"); |
3689 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
9005f3ba |
3690 | ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION); |
3691 | ssh2_pkt_addstring("All open channels closed"); |
3692 | ssh2_pkt_addstring("en"); /* language tag */ |
d211621f |
3693 | ssh2_pkt_send(); |
cf6e59d6 |
3694 | ssh_state = SSH_STATE_CLOSED; |
3257deae |
3695 | crReturnV; |
d211621f |
3696 | } |
3697 | continue; /* remote sends close; ignore (FIXME) */ |
7cca0d81 |
3698 | } else if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
783415f8 |
3699 | unsigned i = ssh2_pkt_getuint32(); |
3700 | struct ssh_channel *c; |
3701 | c = find234(ssh_channels, &i, ssh_channelfind); |
3702 | if (!c) |
3703 | continue; /* nonexistent channel */ |
3704 | mainchan->v2.remwindow += ssh2_pkt_getuint32(); |
d211621f |
3705 | try_send = TRUE; |
783415f8 |
3706 | } else if (pktin.type == SSH2_MSG_CHANNEL_OPEN) { |
3707 | char *type; |
3708 | int typelen; |
3709 | char *error = NULL; |
3710 | struct ssh_channel *c; |
3711 | ssh2_pkt_getstring(&type, &typelen); |
3712 | c = smalloc(sizeof(struct ssh_channel)); |
3713 | |
3714 | if (typelen == 3 && !memcmp(type, "x11", 3)) { |
783415f8 |
3715 | if (!ssh_X11_fwd_enabled) |
3716 | error = "X11 forwarding is not enabled"; |
0c6c9a70 |
3717 | else if ( x11_init(&c->u.x11.s, cfg.x11_display, c) != NULL ) { |
783415f8 |
3718 | error = "Unable to open an X11 connection"; |
3719 | } else { |
3720 | c->type = CHAN_X11; |
3721 | } |
36c2a3e9 |
3722 | } else if (typelen == 22 && |
3723 | !memcmp(type, "auth-agent@openssh.com", 3)) { |
3724 | if (!ssh_agentfwd_enabled) |
3725 | error = "Agent forwarding is not enabled"; |
3726 | else { |
3727 | c->type = CHAN_AGENT; /* identify channel type */ |
3728 | c->u.a.lensofar = 0; |
3729 | } |
783415f8 |
3730 | } else { |
3731 | error = "Unsupported channel type requested"; |
3732 | } |
3733 | |
3734 | c->remoteid = ssh2_pkt_getuint32(); |
3735 | if (error) { |
3736 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
3737 | ssh2_pkt_adduint32(c->remoteid); |
3738 | ssh2_pkt_adduint32(SSH2_OPEN_CONNECT_FAILED); |
3739 | ssh2_pkt_addstring(error); |
3740 | ssh2_pkt_addstring("en"); /* language tag */ |
3741 | ssh2_pkt_send(); |
3742 | sfree(c); |
3743 | } else { |
3744 | struct ssh_channel *d; |
3745 | unsigned i; |
3746 | enum234 e; |
3747 | |
3748 | for (i=1, d = first234(ssh_channels, &e); d; |
3749 | d = next234(&e)) { |
3750 | if (d->localid > i) |
3751 | break; /* found a free number */ |
3752 | i = d->localid + 1; |
3753 | } |
3754 | c->localid = i; |
3755 | c->closes = 0; |
3756 | c->v2.remwindow = ssh2_pkt_getuint32(); |
3757 | c->v2.remmaxpkt = ssh2_pkt_getuint32(); |
3758 | c->v2.outbuffer = NULL; |
3759 | c->v2.outbuflen = c->v2.outbufsize = 0; |
3760 | add234(ssh_channels, c); |
3761 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
3762 | ssh2_pkt_adduint32(c->remoteid); |
3763 | ssh2_pkt_adduint32(c->localid); |
3764 | ssh2_pkt_adduint32(0x8000UL); /* our window size */ |
3765 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
3766 | ssh2_pkt_send(); |
3767 | } |
7cca0d81 |
3768 | } else { |
8d5de777 |
3769 | bombout(("Strange packet received: type %d", pktin.type)); |
3770 | crReturnV; |
7cca0d81 |
3771 | } |
3772 | } else { |
d211621f |
3773 | /* |
3774 | * We have spare data. Add it to the channel buffer. |
3775 | */ |
783415f8 |
3776 | ssh2_add_channel_data(mainchan, in, inlen); |
d211621f |
3777 | try_send = TRUE; |
7cca0d81 |
3778 | } |
d211621f |
3779 | if (try_send) { |
783415f8 |
3780 | enum234 e; |
3781 | struct ssh_channel *c; |
d211621f |
3782 | /* |
783415f8 |
3783 | * Try to send data on all channels if we can. |
d211621f |
3784 | */ |
783415f8 |
3785 | for (c = first234(ssh_channels, &e); c; c = next234(&e)) |
3786 | ssh2_try_send(c); |
d211621f |
3787 | } |
e5574168 |
3788 | } |
3789 | |
3790 | crFinishV; |
3791 | } |
3792 | |
3793 | /* |
7cca0d81 |
3794 | * Handle the top-level SSH2 protocol. |
3795 | */ |
3796 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt) |
3797 | { |
3798 | if (do_ssh2_transport(in, inlen, ispkt) == 0) |
3799 | return; |
3800 | do_ssh2_authconn(in, inlen, ispkt); |
3801 | } |
3802 | |
3803 | /* |
8df7a775 |
3804 | * Called to set up the connection. |
374330e2 |
3805 | * |
3806 | * Returns an error message, or NULL on success. |
374330e2 |
3807 | */ |
8df7a775 |
3808 | static char *ssh_init (char *host, int port, char **realhost) { |
fb09bf1c |
3809 | char *p; |
8f203108 |
3810 | |
3811 | #ifdef MSCRYPTOAPI |
3812 | if(crypto_startup() == 0) |
3813 | return "Microsoft high encryption pack not installed!"; |
3814 | #endif |
374330e2 |
3815 | |
8df7a775 |
3816 | ssh_send_ok = 0; |
0965bee0 |
3817 | ssh_editing = 0; |
3818 | ssh_echoing = 0; |
8df7a775 |
3819 | |
fb09bf1c |
3820 | p = connect_to_host(host, port, realhost); |
3821 | if (p != NULL) |
3822 | return p; |
374330e2 |
3823 | |
374330e2 |
3824 | return NULL; |
3825 | } |
3826 | |
3827 | /* |
374330e2 |
3828 | * Called to send data down the Telnet connection. |
3829 | */ |
3830 | static void ssh_send (char *buf, int len) { |
f78051a1 |
3831 | if (s == NULL || ssh_protocol == NULL) |
374330e2 |
3832 | return; |
3833 | |
3834 | ssh_protocol(buf, len, 0); |
3835 | } |
3836 | |
3837 | /* |
6e48c3fe |
3838 | * Called to set the size of the window from SSH's POV. |
374330e2 |
3839 | */ |
3840 | static void ssh_size(void) { |
3841 | switch (ssh_state) { |
3842 | case SSH_STATE_BEFORE_SIZE: |
3687d221 |
3843 | case SSH_STATE_PREPACKET: |
21248260 |
3844 | case SSH_STATE_CLOSED: |
374330e2 |
3845 | break; /* do nothing */ |
3846 | case SSH_STATE_INTERMED: |
3847 | size_needed = TRUE; /* buffer for later */ |
3848 | break; |
3849 | case SSH_STATE_SESSION: |
fef97f43 |
3850 | if (!cfg.nopty) { |
6e48c3fe |
3851 | if (ssh_version == 1) { |
3852 | send_packet(SSH1_CMSG_WINDOW_SIZE, |
3853 | PKT_INT, rows, PKT_INT, cols, |
3854 | PKT_INT, 0, PKT_INT, 0, PKT_END); |
3855 | } else { |
3856 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
3857 | ssh2_pkt_adduint32(mainchan->remoteid); |
3858 | ssh2_pkt_addstring("window-change"); |
3859 | ssh2_pkt_addbool(0); |
3860 | ssh2_pkt_adduint32(cols); |
3861 | ssh2_pkt_adduint32(rows); |
3862 | ssh2_pkt_adduint32(0); |
3863 | ssh2_pkt_adduint32(0); |
3864 | ssh2_pkt_send(); |
3865 | } |
fef97f43 |
3866 | } |
3687d221 |
3867 | break; |
374330e2 |
3868 | } |
3869 | } |
3870 | |
3871 | /* |
6abbf9e3 |
3872 | * Send Telnet special codes. TS_EOF is useful for `plink', so you |
3873 | * can send an EOF and collect resulting output (e.g. `plink |
3874 | * hostname sort'). |
374330e2 |
3875 | */ |
3876 | static void ssh_special (Telnet_Special code) { |
6abbf9e3 |
3877 | if (code == TS_EOF) { |
3687d221 |
3878 | if (ssh_state != SSH_STATE_SESSION) { |
3879 | /* |
3880 | * Buffer the EOF in case we are pre-SESSION, so we can |
3881 | * send it as soon as we reach SESSION. |
3882 | */ |
3883 | if (code == TS_EOF) |
3884 | eof_needed = TRUE; |
3885 | return; |
3886 | } |
67779be7 |
3887 | if (ssh_version == 1) { |
6abbf9e3 |
3888 | send_packet(SSH1_CMSG_EOF, PKT_END); |
3889 | } else { |
3890 | ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF); |
d211621f |
3891 | ssh2_pkt_adduint32(mainchan->remoteid); |
6abbf9e3 |
3892 | ssh2_pkt_send(); |
3893 | } |
67779be7 |
3894 | logevent("Sent EOF message"); |
ec55b220 |
3895 | } else if (code == TS_PING) { |
3687d221 |
3896 | if (ssh_state == SSH_STATE_CLOSED || ssh_state == SSH_STATE_PREPACKET) |
3897 | return; |
ec55b220 |
3898 | if (ssh_version == 1) { |
3899 | send_packet(SSH1_MSG_IGNORE, PKT_STR, "", PKT_END); |
3900 | } else { |
3901 | ssh2_pkt_init(SSH2_MSG_IGNORE); |
3902 | ssh2_pkt_addstring_start(); |
3903 | ssh2_pkt_send(); |
3904 | } |
6abbf9e3 |
3905 | } else { |
3906 | /* do nothing */ |
3907 | } |
374330e2 |
3908 | } |
3909 | |
8df7a775 |
3910 | static Socket ssh_socket(void) { return s; } |
8ccc75b0 |
3911 | |
3912 | static int ssh_sendok(void) { return ssh_send_ok; } |
fb09bf1c |
3913 | |
0965bee0 |
3914 | static int ssh_ldisc(int option) { |
3915 | if (option == LD_ECHO) return ssh_echoing; |
3916 | if (option == LD_EDIT) return ssh_editing; |
3917 | return FALSE; |
3918 | } |
3919 | |
374330e2 |
3920 | Backend ssh_backend = { |
3921 | ssh_init, |
374330e2 |
3922 | ssh_send, |
3923 | ssh_size, |
4017be6d |
3924 | ssh_special, |
8ccc75b0 |
3925 | ssh_socket, |
97db3be4 |
3926 | ssh_sendok, |
0965bee0 |
3927 | ssh_ldisc, |
97db3be4 |
3928 | 22 |
374330e2 |
3929 | }; |