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