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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, sk_close(s), \ |
23 | s = NULL, connection_fatal msg ) |
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24 | |
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25 | #define SSH1_MSG_DISCONNECT 1 /* 0x1 */ |
26 | #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */ |
27 | #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */ |
28 | #define SSH1_CMSG_USER 4 /* 0x4 */ |
29 | #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */ |
30 | #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */ |
31 | #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */ |
32 | #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */ |
33 | #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */ |
34 | #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */ |
35 | #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */ |
36 | #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */ |
37 | #define SSH1_SMSG_SUCCESS 14 /* 0xe */ |
38 | #define SSH1_SMSG_FAILURE 15 /* 0xf */ |
39 | #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */ |
40 | #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */ |
41 | #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */ |
42 | #define SSH1_CMSG_EOF 19 /* 0x13 */ |
43 | #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */ |
44 | #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */ |
45 | #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */ |
46 | #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */ |
47 | #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */ |
48 | #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */ |
49 | #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */ |
50 | #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */ |
51 | #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */ |
52 | #define SSH1_MSG_IGNORE 32 /* 0x20 */ |
53 | #define SSH1_MSG_DEBUG 36 /* 0x24 */ |
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54 | #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */ |
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55 | #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */ |
56 | #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */ |
57 | #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */ |
58 | #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */ |
59 | #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */ |
60 | #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */ |
61 | |
62 | #define SSH1_AUTH_TIS 5 /* 0x5 */ |
63 | #define SSH1_AUTH_CCARD 16 /* 0x10 */ |
64 | |
65 | #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1 /* 0x1 */ |
66 | #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2 /* 0x2 */ |
67 | #define SSH_AGENTC_RSA_CHALLENGE 3 /* 0x3 */ |
68 | #define SSH_AGENT_RSA_RESPONSE 4 /* 0x4 */ |
69 | #define SSH_AGENT_FAILURE 5 /* 0x5 */ |
70 | #define SSH_AGENT_SUCCESS 6 /* 0x6 */ |
71 | #define SSH_AGENTC_ADD_RSA_IDENTITY 7 /* 0x7 */ |
72 | #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8 /* 0x8 */ |
73 | |
74 | #define SSH2_MSG_DISCONNECT 1 /* 0x1 */ |
75 | #define SSH2_MSG_IGNORE 2 /* 0x2 */ |
76 | #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */ |
77 | #define SSH2_MSG_DEBUG 4 /* 0x4 */ |
78 | #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */ |
79 | #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */ |
80 | #define SSH2_MSG_KEXINIT 20 /* 0x14 */ |
81 | #define SSH2_MSG_NEWKEYS 21 /* 0x15 */ |
82 | #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */ |
83 | #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */ |
84 | #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */ |
85 | #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */ |
86 | #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */ |
87 | #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */ |
88 | #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */ |
89 | #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */ |
90 | #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */ |
91 | #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */ |
92 | #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */ |
93 | #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */ |
94 | #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */ |
95 | #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */ |
96 | #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */ |
97 | #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */ |
98 | #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */ |
99 | #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */ |
100 | #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */ |
101 | #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */ |
102 | #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */ |
103 | #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */ |
104 | |
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105 | #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */ |
106 | #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */ |
107 | #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */ |
108 | #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */ |
109 | #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */ |
110 | #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */ |
111 | #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */ |
112 | #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */ |
113 | #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */ |
114 | #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */ |
115 | #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */ |
116 | |
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117 | #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */ |
118 | #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */ |
119 | #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */ |
120 | #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */ |
121 | |
122 | #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */ |
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123 | |
124 | #define GET_32BIT(cp) \ |
125 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
126 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
127 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
128 | ((unsigned long)(unsigned char)(cp)[3])) |
129 | |
130 | #define PUT_32BIT(cp, value) { \ |
131 | (cp)[0] = (unsigned char)((value) >> 24); \ |
132 | (cp)[1] = (unsigned char)((value) >> 16); \ |
133 | (cp)[2] = (unsigned char)((value) >> 8); \ |
134 | (cp)[3] = (unsigned char)(value); } |
135 | |
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136 | enum { PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR, PKT_BIGNUM }; |
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137 | |
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138 | /* Coroutine mechanics for the sillier bits of the code */ |
139 | #define crBegin1 static int crLine = 0; |
140 | #define crBegin2 switch(crLine) { case 0:; |
141 | #define crBegin crBegin1; crBegin2; |
142 | #define crFinish(z) } crLine = 0; return (z) |
143 | #define crFinishV } crLine = 0; return |
144 | #define crReturn(z) \ |
145 | do {\ |
146 | crLine=__LINE__; return (z); case __LINE__:;\ |
147 | } while (0) |
148 | #define crReturnV \ |
149 | do {\ |
150 | crLine=__LINE__; return; case __LINE__:;\ |
151 | } while (0) |
152 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
153 | #define crStopV do{ crLine = 0; return; }while(0) |
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154 | #define crWaitUntil(c) do { crReturn(0); } while (!(c)) |
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155 | #define crWaitUntilV(c) do { crReturnV; } while (!(c)) |
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156 | |
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157 | extern const struct ssh_cipher ssh_3des; |
158 | extern const struct ssh_cipher ssh_3des_ssh2; |
159 | extern const struct ssh_cipher ssh_des; |
160 | extern const struct ssh_cipher ssh_blowfish_ssh1; |
161 | extern const struct ssh_cipher ssh_blowfish_ssh2; |
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162 | |
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163 | /* |
164 | * Ciphers for SSH2. We miss out single-DES because it isn't |
165 | * supported; also 3DES and Blowfish are both done differently from |
166 | * SSH1. (3DES uses outer chaining; Blowfish has the opposite |
167 | * endianness and different-sized keys.) |
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168 | */ |
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169 | const static struct ssh_cipher *ciphers[] = { &ssh_blowfish_ssh2, &ssh_3des_ssh2 }; |
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170 | |
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171 | extern const struct ssh_kex ssh_diffiehellman; |
172 | const static struct ssh_kex *kex_algs[] = { &ssh_diffiehellman }; |
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173 | |
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174 | extern const struct ssh_signkey ssh_dss; |
175 | const static struct ssh_signkey *hostkey_algs[] = { &ssh_dss }; |
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176 | |
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177 | extern const struct ssh_mac ssh_md5, ssh_sha1, ssh_sha1_buggy; |
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178 | |
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179 | static void nullmac_key(unsigned char *key) { } |
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180 | static void nullmac_generate(unsigned char *blk, int len, unsigned long seq) { } |
181 | static int nullmac_verify(unsigned char *blk, int len, unsigned long seq) { return 1; } |
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182 | const static struct ssh_mac ssh_mac_none = { |
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183 | nullmac_key, nullmac_key, nullmac_generate, nullmac_verify, "none", 0 |
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184 | }; |
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185 | const static struct ssh_mac *macs[] = { |
186 | &ssh_sha1, &ssh_md5, &ssh_mac_none }; |
187 | const static struct ssh_mac *buggymacs[] = { |
188 | &ssh_sha1_buggy, &ssh_md5, &ssh_mac_none }; |
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189 | |
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190 | static void ssh_comp_none_init(void) { } |
191 | static int ssh_comp_none_block(unsigned char *block, int len, |
192 | unsigned char **outblock, int *outlen) { |
193 | return 0; |
194 | } |
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195 | const static struct ssh_compress ssh_comp_none = { |
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196 | "none", |
197 | ssh_comp_none_init, ssh_comp_none_block, |
198 | ssh_comp_none_init, ssh_comp_none_block |
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199 | }; |
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200 | extern const struct ssh_compress ssh_zlib; |
201 | const static struct ssh_compress *compressions[] = { |
202 | &ssh_zlib, &ssh_comp_none }; |
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203 | |
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204 | /* |
205 | * 2-3-4 tree storing channels. |
206 | */ |
207 | struct ssh_channel { |
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208 | unsigned remoteid, localid; |
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209 | int type; |
210 | int closes; |
211 | union { |
212 | struct ssh_agent_channel { |
213 | unsigned char *message; |
214 | unsigned char msglen[4]; |
215 | int lensofar, totallen; |
216 | } a; |
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217 | struct ssh2_data_channel { |
218 | unsigned char *outbuffer; |
219 | unsigned outbuflen, outbufsize; |
220 | unsigned remwindow, remmaxpkt; |
221 | } v2; |
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222 | } u; |
223 | }; |
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224 | |
225 | struct Packet { |
226 | long length; |
227 | int type; |
228 | unsigned char *data; |
229 | unsigned char *body; |
230 | long savedpos; |
231 | long maxlen; |
232 | }; |
233 | |
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234 | static SHA_State exhash, exhashbase; |
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235 | |
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236 | static Socket s = NULL; |
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237 | |
238 | static unsigned char session_key[32]; |
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239 | static int ssh1_compressing; |
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240 | static int ssh_agentfwd_enabled; |
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241 | static const struct ssh_cipher *cipher = NULL; |
242 | static const struct ssh_cipher *cscipher = NULL; |
243 | static const struct ssh_cipher *sccipher = NULL; |
244 | static const struct ssh_mac *csmac = NULL; |
245 | static const struct ssh_mac *scmac = NULL; |
246 | static const struct ssh_compress *cscomp = NULL; |
247 | static const struct ssh_compress *sccomp = NULL; |
248 | static const struct ssh_kex *kex = NULL; |
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249 | static const struct ssh_signkey *hostkey = NULL; |
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250 | int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = NULL; |
251 | |
252 | static char *savedhost; |
253 | static int savedport; |
254 | static int ssh_send_ok; |
255 | |
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256 | static tree234 *ssh_channels; /* indexed by local id */ |
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257 | static struct ssh_channel *mainchan; /* primary session channel */ |
258 | |
259 | static enum { |
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260 | SSH_STATE_PREPACKET, |
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261 | SSH_STATE_BEFORE_SIZE, |
262 | SSH_STATE_INTERMED, |
263 | SSH_STATE_SESSION, |
264 | SSH_STATE_CLOSED |
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265 | } ssh_state = SSH_STATE_PREPACKET; |
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266 | |
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267 | static int size_needed = FALSE, eof_needed = FALSE; |
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268 | |
269 | static struct Packet pktin = { 0, 0, NULL, NULL, 0 }; |
270 | static struct Packet pktout = { 0, 0, NULL, NULL, 0 }; |
271 | |
272 | static int ssh_version; |
273 | static void (*ssh_protocol)(unsigned char *in, int inlen, int ispkt); |
274 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt); |
275 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt); |
276 | static void ssh_size(void); |
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277 | static void ssh_special (Telnet_Special); |
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278 | |
279 | static int (*s_rdpkt)(unsigned char **data, int *datalen); |
280 | |
281 | static struct rdpkt1_state_tag { |
282 | long len, pad, biglen, to_read; |
283 | unsigned long realcrc, gotcrc; |
284 | unsigned char *p; |
285 | int i; |
286 | int chunk; |
287 | } rdpkt1_state; |
288 | |
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289 | static struct rdpkt2_state_tag { |
290 | long len, pad, payload, packetlen, maclen; |
291 | int i; |
292 | int cipherblk; |
293 | unsigned long incoming_sequence; |
294 | } rdpkt2_state; |
295 | |
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296 | static int ssh_channelcmp(void *av, void *bv) { |
297 | struct ssh_channel *a = (struct ssh_channel *)av; |
298 | struct ssh_channel *b = (struct ssh_channel *)bv; |
299 | if (a->localid < b->localid) return -1; |
300 | if (a->localid > b->localid) return +1; |
301 | return 0; |
302 | } |
303 | static int ssh_channelfind(void *av, void *bv) { |
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304 | unsigned *a = (unsigned *)av; |
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305 | struct ssh_channel *b = (struct ssh_channel *)bv; |
306 | if (*a < b->localid) return -1; |
307 | if (*a > b->localid) return +1; |
308 | return 0; |
309 | } |
310 | |
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311 | static void c_write (char *buf, int len) { |
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312 | if ((flags & FLAG_STDERR)) { |
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313 | int i; |
314 | for (i = 0; i < len; i++) |
315 | if (buf[i] != '\r') |
316 | fputc(buf[i], stderr); |
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317 | return; |
318 | } |
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319 | from_backend(1, buf, len); |
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320 | } |
321 | |
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322 | /* |
323 | * Collect incoming data in the incoming packet buffer. |
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324 | * Decipher and verify the packet when it is completely read. |
325 | * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets. |
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326 | * Update the *data and *datalen variables. |
327 | * Return the additional nr of bytes needed, or 0 when |
328 | * a complete packet is available. |
329 | */ |
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330 | static int ssh1_rdpkt(unsigned char **data, int *datalen) |
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331 | { |
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332 | struct rdpkt1_state_tag *st = &rdpkt1_state; |
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333 | |
334 | crBegin; |
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335 | |
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336 | next_packet: |
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337 | |
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338 | pktin.type = 0; |
339 | pktin.length = 0; |
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340 | |
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341 | for (st->i = st->len = 0; st->i < 4; st->i++) { |
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342 | while ((*datalen) == 0) |
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343 | crReturn(4-st->i); |
344 | st->len = (st->len << 8) + **data; |
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345 | (*data)++, (*datalen)--; |
346 | } |
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347 | |
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348 | #ifdef FWHACK |
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349 | if (st->len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
350 | st->len = 0x300; /* big enough to carry to end */ |
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351 | } |
352 | #endif |
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353 | |
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354 | st->pad = 8 - (st->len % 8); |
355 | st->biglen = st->len + st->pad; |
356 | pktin.length = st->len - 5; |
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357 | |
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358 | if (pktin.maxlen < st->biglen) { |
359 | pktin.maxlen = st->biglen; |
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360 | pktin.data = (pktin.data == NULL ? smalloc(st->biglen+APIEXTRA) : |
361 | srealloc(pktin.data, st->biglen+APIEXTRA)); |
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362 | if (!pktin.data) |
363 | fatalbox("Out of memory"); |
364 | } |
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365 | |
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366 | st->to_read = st->biglen; |
367 | st->p = pktin.data; |
368 | while (st->to_read > 0) { |
369 | st->chunk = st->to_read; |
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370 | while ((*datalen) == 0) |
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371 | crReturn(st->to_read); |
372 | if (st->chunk > (*datalen)) |
373 | st->chunk = (*datalen); |
374 | memcpy(st->p, *data, st->chunk); |
375 | *data += st->chunk; |
376 | *datalen -= st->chunk; |
377 | st->p += st->chunk; |
378 | st->to_read -= st->chunk; |
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379 | } |
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380 | |
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381 | if (cipher) |
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382 | cipher->decrypt(pktin.data, st->biglen); |
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383 | #if 0 |
384 | debug(("Got packet len=%d pad=%d\r\n", st->len, st->pad)); |
385 | for (st->i = 0; st->i < st->biglen; st->i++) |
386 | debug((" %02x", (unsigned char)pktin.data[st->i])); |
387 | debug(("\r\n")); |
388 | #endif |
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389 | |
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390 | st->realcrc = crc32(pktin.data, st->biglen-4); |
391 | st->gotcrc = GET_32BIT(pktin.data+st->biglen-4); |
392 | if (st->gotcrc != st->realcrc) { |
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393 | bombout(("Incorrect CRC received on packet")); |
394 | crReturn(0); |
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395 | } |
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396 | |
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397 | pktin.body = pktin.data + st->pad + 1; |
398 | |
399 | if (ssh1_compressing) { |
400 | unsigned char *decompblk; |
401 | int decomplen; |
402 | #if 0 |
403 | int i; |
404 | debug(("Packet payload pre-decompression:\n")); |
405 | for (i = -1; i < pktin.length; i++) |
406 | debug((" %02x", (unsigned char)pktin.body[i])); |
407 | debug(("\r\n")); |
408 | #endif |
409 | zlib_decompress_block(pktin.body-1, pktin.length+1, |
410 | &decompblk, &decomplen); |
411 | |
412 | if (pktin.maxlen < st->pad + decomplen) { |
413 | pktin.maxlen = st->pad + decomplen; |
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414 | pktin.data = srealloc(pktin.data, pktin.maxlen+APIEXTRA); |
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415 | pktin.body = pktin.data + st->pad + 1; |
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416 | if (!pktin.data) |
417 | fatalbox("Out of memory"); |
418 | } |
419 | |
420 | memcpy(pktin.body-1, decompblk, decomplen); |
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421 | sfree(decompblk); |
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422 | pktin.length = decomplen-1; |
423 | #if 0 |
424 | debug(("Packet payload post-decompression:\n")); |
425 | for (i = -1; i < pktin.length; i++) |
426 | debug((" %02x", (unsigned char)pktin.body[i])); |
427 | debug(("\r\n")); |
428 | #endif |
429 | } |
430 | |
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431 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
432 | pktin.type == SSH1_SMSG_STDERR_DATA || |
433 | pktin.type == SSH1_MSG_DEBUG || |
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434 | pktin.type == SSH1_SMSG_AUTH_TIS_CHALLENGE || |
435 | pktin.type == SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
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436 | long strlen = GET_32BIT(pktin.body); |
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437 | if (strlen + 4 != pktin.length) { |
438 | bombout(("Received data packet with bogus string length")); |
439 | crReturn(0); |
440 | } |
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441 | } |
442 | |
4ba9b64b |
443 | pktin.type = pktin.body[-1]; |
444 | |
e5574168 |
445 | if (pktin.type == SSH1_MSG_DEBUG) { |
fb09bf1c |
446 | /* log debug message */ |
447 | char buf[80]; |
448 | int strlen = GET_32BIT(pktin.body); |
449 | strcpy(buf, "Remote: "); |
450 | if (strlen > 70) strlen = 70; |
451 | memcpy(buf+8, pktin.body+4, strlen); |
452 | buf[8+strlen] = '\0'; |
453 | logevent(buf); |
454 | goto next_packet; |
e5574168 |
455 | } else if (pktin.type == SSH1_MSG_IGNORE) { |
fb09bf1c |
456 | /* do nothing */ |
457 | goto next_packet; |
458 | } |
459 | |
460 | crFinish(0); |
461 | } |
462 | |
e5574168 |
463 | static int ssh2_rdpkt(unsigned char **data, int *datalen) |
464 | { |
960e736a |
465 | struct rdpkt2_state_tag *st = &rdpkt2_state; |
e5574168 |
466 | |
467 | crBegin; |
468 | |
469 | next_packet: |
e5574168 |
470 | pktin.type = 0; |
471 | pktin.length = 0; |
960e736a |
472 | if (sccipher) |
473 | st->cipherblk = sccipher->blksize; |
e5574168 |
474 | else |
960e736a |
475 | st->cipherblk = 8; |
476 | if (st->cipherblk < 8) |
477 | st->cipherblk = 8; |
478 | |
479 | if (pktin.maxlen < st->cipherblk) { |
480 | pktin.maxlen = st->cipherblk; |
dcbde236 |
481 | pktin.data = (pktin.data == NULL ? smalloc(st->cipherblk+APIEXTRA) : |
482 | srealloc(pktin.data, st->cipherblk+APIEXTRA)); |
e5574168 |
483 | if (!pktin.data) |
484 | fatalbox("Out of memory"); |
485 | } |
486 | |
487 | /* |
488 | * Acquire and decrypt the first block of the packet. This will |
489 | * contain the length and padding details. |
490 | */ |
960e736a |
491 | for (st->i = st->len = 0; st->i < st->cipherblk; st->i++) { |
e5574168 |
492 | while ((*datalen) == 0) |
960e736a |
493 | crReturn(st->cipherblk-st->i); |
494 | pktin.data[st->i] = *(*data)++; |
e5574168 |
495 | (*datalen)--; |
496 | } |
497 | #ifdef FWHACK |
498 | if (!memcmp(pktin.data, "Remo", 4)) {/* "Remo"te server has closed ... */ |
499 | /* FIXME */ |
500 | } |
501 | #endif |
502 | if (sccipher) |
960e736a |
503 | sccipher->decrypt(pktin.data, st->cipherblk); |
e5574168 |
504 | |
505 | /* |
506 | * Now get the length and padding figures. |
507 | */ |
960e736a |
508 | st->len = GET_32BIT(pktin.data); |
509 | st->pad = pktin.data[4]; |
e5574168 |
510 | |
511 | /* |
512 | * This enables us to deduce the payload length. |
513 | */ |
960e736a |
514 | st->payload = st->len - st->pad - 1; |
e5574168 |
515 | |
960e736a |
516 | pktin.length = st->payload + 5; |
e5574168 |
517 | |
518 | /* |
519 | * So now we can work out the total packet length. |
520 | */ |
960e736a |
521 | st->packetlen = st->len + 4; |
522 | st->maclen = scmac ? scmac->len : 0; |
e5574168 |
523 | |
524 | /* |
525 | * Adjust memory allocation if packet is too big. |
526 | */ |
960e736a |
527 | if (pktin.maxlen < st->packetlen+st->maclen) { |
528 | pktin.maxlen = st->packetlen+st->maclen; |
dcbde236 |
529 | pktin.data = (pktin.data == NULL ? smalloc(pktin.maxlen+APIEXTRA) : |
530 | srealloc(pktin.data, pktin.maxlen+APIEXTRA)); |
e5574168 |
531 | if (!pktin.data) |
532 | fatalbox("Out of memory"); |
533 | } |
534 | |
535 | /* |
536 | * Read and decrypt the remainder of the packet. |
537 | */ |
960e736a |
538 | for (st->i = st->cipherblk; st->i < st->packetlen + st->maclen; st->i++) { |
e5574168 |
539 | while ((*datalen) == 0) |
960e736a |
540 | crReturn(st->packetlen + st->maclen - st->i); |
541 | pktin.data[st->i] = *(*data)++; |
e5574168 |
542 | (*datalen)--; |
543 | } |
544 | /* Decrypt everything _except_ the MAC. */ |
545 | if (sccipher) |
960e736a |
546 | sccipher->decrypt(pktin.data + st->cipherblk, |
547 | st->packetlen - st->cipherblk); |
e5574168 |
548 | |
7cca0d81 |
549 | #if 0 |
960e736a |
550 | debug(("Got packet len=%d pad=%d\r\n", st->len, st->pad)); |
551 | for (st->i = 0; st->i < st->packetlen; st->i++) |
552 | debug((" %02x", (unsigned char)pktin.data[st->i])); |
d39f364a |
553 | debug(("\r\n")); |
7cca0d81 |
554 | #endif |
d39f364a |
555 | |
e5574168 |
556 | /* |
557 | * Check the MAC. |
558 | */ |
960e736a |
559 | if (scmac && !scmac->verify(pktin.data, st->len+4, st->incoming_sequence)) { |
8d5de777 |
560 | bombout(("Incorrect MAC received on packet")); |
561 | crReturn(0); |
562 | } |
960e736a |
563 | st->incoming_sequence++; /* whether or not we MACed */ |
e5574168 |
564 | |
4ba9b64b |
565 | /* |
566 | * Decompress packet payload. |
567 | */ |
568 | { |
569 | unsigned char *newpayload; |
570 | int newlen; |
571 | if (sccomp && sccomp->decompress(pktin.data+5, pktin.length-5, |
572 | &newpayload, &newlen)) { |
573 | if (pktin.maxlen < newlen+5) { |
574 | pktin.maxlen = newlen+5; |
dcbde236 |
575 | pktin.data = (pktin.data == NULL ? smalloc(pktin.maxlen+APIEXTRA) : |
576 | srealloc(pktin.data, pktin.maxlen+APIEXTRA)); |
4ba9b64b |
577 | if (!pktin.data) |
578 | fatalbox("Out of memory"); |
579 | } |
580 | pktin.length = 5 + newlen; |
581 | memcpy(pktin.data+5, newpayload, newlen); |
582 | #if 0 |
583 | debug(("Post-decompression payload:\r\n")); |
584 | for (st->i = 0; st->i < newlen; st->i++) |
585 | debug((" %02x", (unsigned char)pktin.data[5+st->i])); |
586 | debug(("\r\n")); |
587 | #endif |
588 | |
dcbde236 |
589 | sfree(newpayload); |
4ba9b64b |
590 | } |
591 | } |
592 | |
e5574168 |
593 | pktin.savedpos = 6; |
594 | pktin.type = pktin.data[5]; |
e5574168 |
595 | |
7cca0d81 |
596 | if (pktin.type == SSH2_MSG_IGNORE || pktin.type == SSH2_MSG_DEBUG) |
597 | goto next_packet; /* FIXME: print DEBUG message */ |
e5574168 |
598 | |
599 | crFinish(0); |
600 | } |
601 | |
4ba9b64b |
602 | static void ssh1_pktout_size(int len) { |
374330e2 |
603 | int pad, biglen; |
604 | |
605 | len += 5; /* type and CRC */ |
606 | pad = 8 - (len%8); |
607 | biglen = len + pad; |
608 | |
609 | pktout.length = len-5; |
610 | if (pktout.maxlen < biglen) { |
611 | pktout.maxlen = biglen; |
8f203108 |
612 | #ifdef MSCRYPTOAPI |
fb09bf1c |
613 | /* Allocate enough buffer space for extra block |
8f203108 |
614 | * for MS CryptEncrypt() */ |
dcbde236 |
615 | pktout.data = (pktout.data == NULL ? smalloc(biglen+12) : |
616 | srealloc(pktout.data, biglen+12)); |
8f203108 |
617 | #else |
dcbde236 |
618 | pktout.data = (pktout.data == NULL ? smalloc(biglen+4) : |
619 | srealloc(pktout.data, biglen+4)); |
8f203108 |
620 | #endif |
374330e2 |
621 | if (!pktout.data) |
622 | fatalbox("Out of memory"); |
623 | } |
4ba9b64b |
624 | pktout.body = pktout.data+4+pad+1; |
625 | } |
374330e2 |
626 | |
4ba9b64b |
627 | static void s_wrpkt_start(int type, int len) { |
628 | ssh1_pktout_size(len); |
374330e2 |
629 | pktout.type = type; |
374330e2 |
630 | } |
631 | |
632 | static void s_wrpkt(void) { |
633 | int pad, len, biglen, i; |
634 | unsigned long crc; |
635 | |
4ba9b64b |
636 | pktout.body[-1] = pktout.type; |
637 | |
638 | if (ssh1_compressing) { |
639 | unsigned char *compblk; |
640 | int complen; |
641 | #if 0 |
642 | debug(("Packet payload pre-compression:\n")); |
643 | for (i = -1; i < pktout.length; i++) |
644 | debug((" %02x", (unsigned char)pktout.body[i])); |
645 | debug(("\r\n")); |
646 | #endif |
647 | zlib_compress_block(pktout.body-1, pktout.length+1, |
648 | &compblk, &complen); |
649 | ssh1_pktout_size(complen-1); |
650 | memcpy(pktout.body-1, compblk, complen); |
dcbde236 |
651 | sfree(compblk); |
4ba9b64b |
652 | #if 0 |
653 | debug(("Packet payload post-compression:\n")); |
654 | for (i = -1; i < pktout.length; i++) |
655 | debug((" %02x", (unsigned char)pktout.body[i])); |
656 | debug(("\r\n")); |
657 | #endif |
658 | } |
659 | |
374330e2 |
660 | len = pktout.length + 5; /* type and CRC */ |
661 | pad = 8 - (len%8); |
662 | biglen = len + pad; |
663 | |
374330e2 |
664 | for (i=0; i<pad; i++) |
665 | pktout.data[i+4] = random_byte(); |
666 | crc = crc32(pktout.data+4, biglen-4); |
fb09bf1c |
667 | PUT_32BIT(pktout.data+biglen, crc); |
668 | PUT_32BIT(pktout.data, len); |
374330e2 |
669 | |
698a5108 |
670 | #if 0 |
671 | debug(("Sending packet len=%d\r\n", biglen+4)); |
672 | for (i = 0; i < biglen+4; i++) |
673 | debug((" %02x", (unsigned char)pktout.data[i])); |
674 | debug(("\r\n")); |
675 | #endif |
374330e2 |
676 | if (cipher) |
677 | cipher->encrypt(pktout.data+4, biglen); |
678 | |
8df7a775 |
679 | sk_write(s, pktout.data, biglen+4); |
374330e2 |
680 | } |
681 | |
fb09bf1c |
682 | /* |
683 | * Construct a packet with the specified contents and |
684 | * send it to the server. |
685 | */ |
686 | static void send_packet(int pkttype, ...) |
687 | { |
688 | va_list args; |
689 | unsigned char *p, *argp, argchar; |
690 | unsigned long argint; |
691 | int pktlen, argtype, arglen; |
7cca0d81 |
692 | Bignum bn; |
fb09bf1c |
693 | |
694 | pktlen = 0; |
695 | va_start(args, pkttype); |
696 | while ((argtype = va_arg(args, int)) != PKT_END) { |
697 | switch (argtype) { |
698 | case PKT_INT: |
699 | (void) va_arg(args, int); |
700 | pktlen += 4; |
701 | break; |
702 | case PKT_CHAR: |
703 | (void) va_arg(args, char); |
704 | pktlen++; |
705 | break; |
706 | case PKT_DATA: |
707 | (void) va_arg(args, unsigned char *); |
708 | arglen = va_arg(args, int); |
709 | pktlen += arglen; |
710 | break; |
711 | case PKT_STR: |
712 | argp = va_arg(args, unsigned char *); |
713 | arglen = strlen(argp); |
714 | pktlen += 4 + arglen; |
715 | break; |
7cca0d81 |
716 | case PKT_BIGNUM: |
717 | bn = va_arg(args, Bignum); |
5c58ad2d |
718 | pktlen += ssh1_bignum_length(bn); |
7cca0d81 |
719 | break; |
fb09bf1c |
720 | default: |
721 | assert(0); |
722 | } |
723 | } |
724 | va_end(args); |
725 | |
726 | s_wrpkt_start(pkttype, pktlen); |
727 | p = pktout.body; |
728 | |
729 | va_start(args, pkttype); |
730 | while ((argtype = va_arg(args, int)) != PKT_END) { |
731 | switch (argtype) { |
732 | case PKT_INT: |
733 | argint = va_arg(args, int); |
734 | PUT_32BIT(p, argint); |
735 | p += 4; |
736 | break; |
737 | case PKT_CHAR: |
738 | argchar = va_arg(args, unsigned char); |
739 | *p = argchar; |
740 | p++; |
741 | break; |
742 | case PKT_DATA: |
743 | argp = va_arg(args, unsigned char *); |
744 | arglen = va_arg(args, int); |
745 | memcpy(p, argp, arglen); |
746 | p += arglen; |
747 | break; |
748 | case PKT_STR: |
749 | argp = va_arg(args, unsigned char *); |
750 | arglen = strlen(argp); |
751 | PUT_32BIT(p, arglen); |
752 | memcpy(p + 4, argp, arglen); |
753 | p += 4 + arglen; |
754 | break; |
7cca0d81 |
755 | case PKT_BIGNUM: |
756 | bn = va_arg(args, Bignum); |
5c58ad2d |
757 | p += ssh1_write_bignum(p, bn); |
7cca0d81 |
758 | break; |
fb09bf1c |
759 | } |
760 | } |
761 | va_end(args); |
762 | |
763 | s_wrpkt(); |
764 | } |
765 | |
9697bfd2 |
766 | static int ssh_versioncmp(char *a, char *b) { |
767 | char *ae, *be; |
768 | unsigned long av, bv; |
769 | |
43aa02a7 |
770 | av = strtoul(a, &ae, 10); |
771 | bv = strtoul(b, &be, 10); |
9697bfd2 |
772 | if (av != bv) return (av < bv ? -1 : +1); |
773 | if (*ae == '.') ae++; |
774 | if (*be == '.') be++; |
43aa02a7 |
775 | av = strtoul(ae, &ae, 10); |
776 | bv = strtoul(be, &be, 10); |
9697bfd2 |
777 | if (av != bv) return (av < bv ? -1 : +1); |
778 | return 0; |
779 | } |
780 | |
e5574168 |
781 | |
782 | /* |
783 | * Utility routine for putting an SSH-protocol `string' into a SHA |
784 | * state. |
785 | */ |
786 | #include <stdio.h> |
75cab814 |
787 | static void sha_string(SHA_State *s, void *str, int len) { |
e5574168 |
788 | unsigned char lenblk[4]; |
e5574168 |
789 | PUT_32BIT(lenblk, len); |
e5574168 |
790 | SHA_Bytes(s, lenblk, 4); |
e5574168 |
791 | SHA_Bytes(s, str, len); |
792 | } |
793 | |
7cca0d81 |
794 | /* |
795 | * SSH2 packet construction functions. |
796 | */ |
75cab814 |
797 | static void ssh2_pkt_adddata(void *data, int len) { |
7cca0d81 |
798 | pktout.length += len; |
799 | if (pktout.maxlen < pktout.length) { |
800 | pktout.maxlen = pktout.length + 256; |
dcbde236 |
801 | pktout.data = (pktout.data == NULL ? smalloc(pktout.maxlen+APIEXTRA) : |
802 | srealloc(pktout.data, pktout.maxlen+APIEXTRA)); |
7cca0d81 |
803 | if (!pktout.data) |
804 | fatalbox("Out of memory"); |
805 | } |
806 | memcpy(pktout.data+pktout.length-len, data, len); |
807 | } |
75cab814 |
808 | static void ssh2_pkt_addbyte(unsigned char byte) { |
7cca0d81 |
809 | ssh2_pkt_adddata(&byte, 1); |
810 | } |
75cab814 |
811 | static void ssh2_pkt_init(int pkt_type) { |
7cca0d81 |
812 | pktout.length = 5; |
813 | ssh2_pkt_addbyte((unsigned char)pkt_type); |
814 | } |
75cab814 |
815 | static void ssh2_pkt_addbool(unsigned char value) { |
7cca0d81 |
816 | ssh2_pkt_adddata(&value, 1); |
817 | } |
75cab814 |
818 | static void ssh2_pkt_adduint32(unsigned long value) { |
7cca0d81 |
819 | unsigned char x[4]; |
820 | PUT_32BIT(x, value); |
821 | ssh2_pkt_adddata(x, 4); |
822 | } |
75cab814 |
823 | static void ssh2_pkt_addstring_start(void) { |
7cca0d81 |
824 | ssh2_pkt_adduint32(0); |
825 | pktout.savedpos = pktout.length; |
826 | } |
75cab814 |
827 | static void ssh2_pkt_addstring_str(char *data) { |
7cca0d81 |
828 | ssh2_pkt_adddata(data, strlen(data)); |
829 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
830 | pktout.length - pktout.savedpos); |
831 | } |
75cab814 |
832 | static void ssh2_pkt_addstring_data(char *data, int len) { |
7cca0d81 |
833 | ssh2_pkt_adddata(data, len); |
834 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
835 | pktout.length - pktout.savedpos); |
836 | } |
75cab814 |
837 | static void ssh2_pkt_addstring(char *data) { |
7cca0d81 |
838 | ssh2_pkt_addstring_start(); |
839 | ssh2_pkt_addstring_str(data); |
840 | } |
75cab814 |
841 | static char *ssh2_mpint_fmt(Bignum b, int *len) { |
7cca0d81 |
842 | unsigned char *p; |
843 | int i, n = b[0]; |
dcbde236 |
844 | p = smalloc(n * 2 + 1); |
7cca0d81 |
845 | if (!p) |
846 | fatalbox("out of memory"); |
847 | p[0] = 0; |
848 | for (i = 0; i < n; i++) { |
849 | p[i*2+1] = (b[n-i] >> 8) & 0xFF; |
850 | p[i*2+2] = (b[n-i] ) & 0xFF; |
851 | } |
852 | i = 0; |
853 | while (p[i] == 0 && (p[i+1] & 0x80) == 0) |
854 | i++; |
855 | memmove(p, p+i, n*2+1-i); |
856 | *len = n*2+1-i; |
857 | return p; |
858 | } |
75cab814 |
859 | static void ssh2_pkt_addmp(Bignum b) { |
7cca0d81 |
860 | unsigned char *p; |
861 | int len; |
862 | p = ssh2_mpint_fmt(b, &len); |
863 | ssh2_pkt_addstring_start(); |
864 | ssh2_pkt_addstring_data(p, len); |
dcbde236 |
865 | sfree(p); |
7cca0d81 |
866 | } |
75cab814 |
867 | static void ssh2_pkt_send(void) { |
7cca0d81 |
868 | int cipherblk, maclen, padding, i; |
869 | static unsigned long outgoing_sequence = 0; |
870 | |
871 | /* |
4ba9b64b |
872 | * Compress packet payload. |
873 | */ |
874 | #if 0 |
875 | debug(("Pre-compression payload:\r\n")); |
876 | for (i = 5; i < pktout.length; i++) |
877 | debug((" %02x", (unsigned char)pktout.data[i])); |
878 | debug(("\r\n")); |
879 | #endif |
880 | { |
881 | unsigned char *newpayload; |
882 | int newlen; |
883 | if (cscomp && cscomp->compress(pktout.data+5, pktout.length-5, |
884 | &newpayload, &newlen)) { |
885 | pktout.length = 5; |
886 | ssh2_pkt_adddata(newpayload, newlen); |
dcbde236 |
887 | sfree(newpayload); |
4ba9b64b |
888 | } |
889 | } |
890 | |
891 | /* |
7cca0d81 |
892 | * Add padding. At least four bytes, and must also bring total |
893 | * length (minus MAC) up to a multiple of the block size. |
894 | */ |
895 | cipherblk = cipher ? cipher->blksize : 8; /* block size */ |
896 | cipherblk = cipherblk < 8 ? 8 : cipherblk; /* or 8 if blksize < 8 */ |
897 | padding = 4; |
898 | padding += (cipherblk - (pktout.length + padding) % cipherblk) % cipherblk; |
899 | pktout.data[4] = padding; |
900 | for (i = 0; i < padding; i++) |
901 | pktout.data[pktout.length + i] = random_byte(); |
902 | PUT_32BIT(pktout.data, pktout.length + padding - 4); |
903 | if (csmac) |
904 | csmac->generate(pktout.data, pktout.length + padding, |
905 | outgoing_sequence); |
906 | outgoing_sequence++; /* whether or not we MACed */ |
907 | |
908 | #if 0 |
909 | debug(("Sending packet len=%d\r\n", pktout.length+padding)); |
910 | for (i = 0; i < pktout.length+padding; i++) |
911 | debug((" %02x", (unsigned char)pktout.data[i])); |
912 | debug(("\r\n")); |
913 | #endif |
914 | |
915 | if (cscipher) |
916 | cscipher->encrypt(pktout.data, pktout.length + padding); |
917 | maclen = csmac ? csmac->len : 0; |
918 | |
8df7a775 |
919 | sk_write(s, pktout.data, pktout.length + padding + maclen); |
7cca0d81 |
920 | } |
921 | |
922 | #if 0 |
923 | void bndebug(char *string, Bignum b) { |
924 | unsigned char *p; |
925 | int i, len; |
926 | p = ssh2_mpint_fmt(b, &len); |
927 | debug(("%s", string)); |
928 | for (i = 0; i < len; i++) |
929 | debug((" %02x", p[i])); |
930 | debug(("\r\n")); |
dcbde236 |
931 | sfree(p); |
7cca0d81 |
932 | } |
933 | #endif |
934 | |
75cab814 |
935 | static void sha_mpint(SHA_State *s, Bignum b) { |
7cca0d81 |
936 | unsigned char *p; |
937 | int len; |
938 | p = ssh2_mpint_fmt(b, &len); |
939 | sha_string(s, p, len); |
dcbde236 |
940 | sfree(p); |
7cca0d81 |
941 | } |
942 | |
943 | /* |
944 | * SSH2 packet decode functions. |
945 | */ |
75cab814 |
946 | static unsigned long ssh2_pkt_getuint32(void) { |
7cca0d81 |
947 | unsigned long value; |
948 | if (pktin.length - pktin.savedpos < 4) |
949 | return 0; /* arrgh, no way to decline (FIXME?) */ |
950 | value = GET_32BIT(pktin.data+pktin.savedpos); |
951 | pktin.savedpos += 4; |
952 | return value; |
953 | } |
75cab814 |
954 | static void ssh2_pkt_getstring(char **p, int *length) { |
7cca0d81 |
955 | *p = NULL; |
956 | if (pktin.length - pktin.savedpos < 4) |
957 | return; |
958 | *length = GET_32BIT(pktin.data+pktin.savedpos); |
959 | pktin.savedpos += 4; |
960 | if (pktin.length - pktin.savedpos < *length) |
961 | return; |
962 | *p = pktin.data+pktin.savedpos; |
963 | pktin.savedpos += *length; |
964 | } |
75cab814 |
965 | static Bignum ssh2_pkt_getmp(void) { |
7cca0d81 |
966 | char *p; |
967 | int i, j, length; |
968 | Bignum b; |
969 | |
970 | ssh2_pkt_getstring(&p, &length); |
971 | if (!p) |
972 | return NULL; |
8d5de777 |
973 | if (p[0] & 0x80) { |
974 | bombout(("internal error: Can't handle negative mpints")); |
975 | return NULL; |
976 | } |
7cca0d81 |
977 | b = newbn((length+1)/2); |
978 | for (i = 0; i < length; i++) { |
979 | j = length - 1 - i; |
980 | if (j & 1) |
981 | b[j/2+1] |= ((unsigned char)p[i]) << 8; |
982 | else |
983 | b[j/2+1] |= ((unsigned char)p[i]); |
984 | } |
6b4e00ee |
985 | while (b[0] > 1 && b[b[0]] == 0) b[0]--; |
7cca0d81 |
986 | return b; |
987 | } |
988 | |
8df7a775 |
989 | static int do_ssh_init(unsigned char c) { |
990 | static char *vsp; |
991 | static char version[10]; |
992 | static char vstring[80]; |
993 | static char vlog[sizeof(vstring)+20]; |
994 | static int i; |
374330e2 |
995 | |
8df7a775 |
996 | crBegin; |
997 | |
998 | /* Search for the string "SSH-" in the input. */ |
374330e2 |
999 | i = 0; |
8df7a775 |
1000 | while (1) { |
1001 | static const int transS[] = { 1, 2, 2, 1 }; |
1002 | static const int transH[] = { 0, 0, 3, 0 }; |
1003 | static const int transminus[] = { 0, 0, 0, -1 }; |
1004 | if (c == 'S') i = transS[i]; |
1005 | else if (c == 'H') i = transH[i]; |
1006 | else if (c == '-') i = transminus[i]; |
374330e2 |
1007 | else i = 0; |
8df7a775 |
1008 | if (i < 0) |
1009 | break; |
1010 | crReturn(1); /* get another character */ |
374330e2 |
1011 | } |
8df7a775 |
1012 | |
c5e9c988 |
1013 | strcpy(vstring, "SSH-"); |
1014 | vsp = vstring+4; |
374330e2 |
1015 | i = 0; |
1016 | while (1) { |
8df7a775 |
1017 | crReturn(1); /* get another char */ |
c5e9c988 |
1018 | if (vsp < vstring+sizeof(vstring)-1) |
1019 | *vsp++ = c; |
374330e2 |
1020 | if (i >= 0) { |
1021 | if (c == '-') { |
1022 | version[i] = '\0'; |
1023 | i = -1; |
1024 | } else if (i < sizeof(version)-1) |
1025 | version[i++] = c; |
1026 | } |
1027 | else if (c == '\n') |
1028 | break; |
1029 | } |
1030 | |
db7d555c |
1031 | ssh_agentfwd_enabled = FALSE; |
960e736a |
1032 | rdpkt2_state.incoming_sequence = 0; |
1033 | |
c5e9c988 |
1034 | *vsp = 0; |
1035 | sprintf(vlog, "Server version: %s", vstring); |
1036 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1037 | logevent(vlog); |
1038 | |
adf799dd |
1039 | /* |
1040 | * Server version "1.99" means we can choose whether we use v1 |
1041 | * or v2 protocol. Choice is based on cfg.sshprot. |
1042 | */ |
1043 | if (ssh_versioncmp(version, cfg.sshprot == 1 ? "2.0" : "1.99") >= 0) { |
e5574168 |
1044 | /* |
1045 | * This is a v2 server. Begin v2 protocol. |
1046 | */ |
1047 | char *verstring = "SSH-2.0-PuTTY"; |
0db56f73 |
1048 | SHA_Init(&exhashbase); |
e5574168 |
1049 | /* |
1050 | * Hash our version string and their version string. |
1051 | */ |
0db56f73 |
1052 | sha_string(&exhashbase, verstring, strlen(verstring)); |
1053 | sha_string(&exhashbase, vstring, strcspn(vstring, "\r\n")); |
e5574168 |
1054 | sprintf(vstring, "%s\n", verstring); |
1055 | sprintf(vlog, "We claim version: %s", verstring); |
1056 | logevent(vlog); |
1057 | logevent("Using SSH protocol version 2"); |
8df7a775 |
1058 | sk_write(s, vstring, strlen(vstring)); |
e5574168 |
1059 | ssh_protocol = ssh2_protocol; |
6abbf9e3 |
1060 | ssh_version = 2; |
e5574168 |
1061 | s_rdpkt = ssh2_rdpkt; |
1062 | } else { |
1063 | /* |
1064 | * This is a v1 server. Begin v1 protocol. |
1065 | */ |
1066 | sprintf(vstring, "SSH-%s-PuTTY\n", |
1067 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5")); |
1068 | sprintf(vlog, "We claim version: %s", vstring); |
1069 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1070 | logevent(vlog); |
1071 | logevent("Using SSH protocol version 1"); |
8df7a775 |
1072 | sk_write(s, vstring, strlen(vstring)); |
e5574168 |
1073 | ssh_protocol = ssh1_protocol; |
6abbf9e3 |
1074 | ssh_version = 1; |
e5574168 |
1075 | s_rdpkt = ssh1_rdpkt; |
1076 | } |
3687d221 |
1077 | ssh_state = SSH_STATE_BEFORE_SIZE; |
8df7a775 |
1078 | |
1079 | crFinish(0); |
1080 | } |
1081 | |
1082 | static void ssh_gotdata(unsigned char *data, int datalen) |
1083 | { |
1084 | crBegin; |
1085 | |
1086 | /* |
1087 | * To begin with, feed the characters one by one to the |
1088 | * protocol initialisation / selection function do_ssh_init(). |
1089 | * When that returns 0, we're done with the initial greeting |
1090 | * exchange and can move on to packet discipline. |
1091 | */ |
1092 | while (1) { |
1093 | int ret; |
1094 | if (datalen == 0) |
1095 | crReturnV; /* more data please */ |
1096 | ret = do_ssh_init(*data); |
1097 | data++; datalen--; |
1098 | if (ret == 0) |
1099 | break; |
1100 | } |
1101 | |
1102 | /* |
1103 | * We emerge from that loop when the initial negotiation is |
1104 | * over and we have selected an s_rdpkt function. Now pass |
1105 | * everything to s_rdpkt, and then pass the resulting packets |
1106 | * to the proper protocol handler. |
1107 | */ |
1108 | if (datalen == 0) |
1109 | crReturnV; |
1110 | while (1) { |
1111 | while (datalen > 0) { |
1112 | if ( s_rdpkt(&data, &datalen) == 0 ) { |
1113 | ssh_protocol(NULL, 0, 1); |
1114 | if (ssh_state == SSH_STATE_CLOSED) { |
1115 | return; |
1116 | } |
1117 | } |
1118 | } |
1119 | crReturnV; |
1120 | } |
1121 | crFinishV; |
1122 | } |
1123 | |
340cf649 |
1124 | static int ssh_receive(Socket skt, int urgent, char *data, int len) { |
8df7a775 |
1125 | if (!len) { |
1126 | /* Connection has closed. */ |
6abb6cd7 |
1127 | ssh_state = SSH_STATE_CLOSED; |
8df7a775 |
1128 | sk_close(s); |
1129 | s = NULL; |
1130 | return 0; |
1131 | } |
1132 | ssh_gotdata (data, len); |
3257deae |
1133 | if (ssh_state == SSH_STATE_CLOSED) { |
1134 | if (s) { |
1135 | sk_close(s); |
1136 | s = NULL; |
1137 | } |
1138 | return 0; |
1139 | } |
fef97f43 |
1140 | return 1; |
374330e2 |
1141 | } |
1142 | |
fb09bf1c |
1143 | /* |
8df7a775 |
1144 | * Connect to specified host and port. |
1145 | * Returns an error message, or NULL on success. |
1146 | * Also places the canonical host name into `realhost'. |
1147 | */ |
1148 | static char *connect_to_host(char *host, int port, char **realhost) |
1149 | { |
1150 | SockAddr addr; |
1151 | char *err; |
1152 | #ifdef FWHACK |
1153 | char *FWhost; |
1154 | int FWport; |
1155 | #endif |
1156 | |
dcbde236 |
1157 | savedhost = smalloc(1+strlen(host)); |
8df7a775 |
1158 | if (!savedhost) |
1159 | fatalbox("Out of memory"); |
1160 | strcpy(savedhost, host); |
1161 | |
1162 | if (port < 0) |
1163 | port = 22; /* default ssh port */ |
1164 | savedport = port; |
1165 | |
1166 | #ifdef FWHACK |
1167 | FWhost = host; |
1168 | FWport = port; |
1169 | host = FWSTR; |
1170 | port = 23; |
1171 | #endif |
1172 | |
1173 | /* |
1174 | * Try to find host. |
1175 | */ |
1176 | addr = sk_namelookup(host, realhost); |
1177 | if ( (err = sk_addr_error(addr)) ) |
1178 | return err; |
1179 | |
1180 | #ifdef FWHACK |
1181 | *realhost = FWhost; |
1182 | #endif |
1183 | |
1184 | /* |
1185 | * Open socket. |
1186 | */ |
1187 | s = sk_new(addr, port, ssh_receive); |
1188 | if ( (err = sk_socket_error(s)) ) |
1189 | return err; |
1190 | |
1191 | #ifdef FWHACK |
1192 | sk_write(s, "connect ", 8); |
1193 | sk_write(s, FWhost, strlen(FWhost)); |
1194 | { |
1195 | char buf[20]; |
1196 | sprintf(buf, " %d\n", FWport); |
1197 | sk_write(s, buf, strlen(buf)); |
1198 | } |
1199 | #endif |
1200 | |
1201 | return NULL; |
1202 | } |
1203 | |
1204 | /* |
fb09bf1c |
1205 | * Handle the key exchange and user authentication phases. |
1206 | */ |
e5574168 |
1207 | static int do_ssh1_login(unsigned char *in, int inlen, int ispkt) |
fb09bf1c |
1208 | { |
374330e2 |
1209 | int i, j, len; |
374330e2 |
1210 | unsigned char *rsabuf, *keystr1, *keystr2; |
1211 | unsigned char cookie[8]; |
1212 | struct RSAKey servkey, hostkey; |
1213 | struct MD5Context md5c; |
ccbfb941 |
1214 | static unsigned long supported_ciphers_mask, supported_auths_mask; |
7cca0d81 |
1215 | static int tried_publickey; |
1216 | static unsigned char session_id[16]; |
bea1ef5f |
1217 | int cipher_type; |
b585ec46 |
1218 | static char username[100]; |
374330e2 |
1219 | |
374330e2 |
1220 | crBegin; |
1221 | |
fb09bf1c |
1222 | if (!ispkt) crWaitUntil(ispkt); |
374330e2 |
1223 | |
8d5de777 |
1224 | if (pktin.type != SSH1_SMSG_PUBLIC_KEY) { |
1225 | bombout(("Public key packet not received")); |
1226 | crReturn(0); |
1227 | } |
374330e2 |
1228 | |
c5e9c988 |
1229 | logevent("Received public keys"); |
374330e2 |
1230 | |
c5e9c988 |
1231 | memcpy(cookie, pktin.body, 8); |
374330e2 |
1232 | |
7cca0d81 |
1233 | i = makekey(pktin.body+8, &servkey, &keystr1, 0); |
1234 | j = makekey(pktin.body+8+i, &hostkey, &keystr2, 0); |
374330e2 |
1235 | |
c5e9c988 |
1236 | /* |
1c2a93c4 |
1237 | * Log the host key fingerprint. |
c5e9c988 |
1238 | */ |
c5e9c988 |
1239 | { |
1240 | char logmsg[80]; |
1c2a93c4 |
1241 | logevent("Host key fingerprint is:"); |
c5e9c988 |
1242 | strcpy(logmsg, " "); |
1c2a93c4 |
1243 | hostkey.comment = NULL; |
1244 | rsa_fingerprint(logmsg+strlen(logmsg), sizeof(logmsg)-strlen(logmsg), |
1245 | &hostkey); |
c5e9c988 |
1246 | logevent(logmsg); |
1247 | } |
1248 | |
fb09bf1c |
1249 | supported_ciphers_mask = GET_32BIT(pktin.body+12+i+j); |
1250 | supported_auths_mask = GET_32BIT(pktin.body+16+i+j); |
bea1ef5f |
1251 | |
c5e9c988 |
1252 | MD5Init(&md5c); |
374330e2 |
1253 | MD5Update(&md5c, keystr2, hostkey.bytes); |
1254 | MD5Update(&md5c, keystr1, servkey.bytes); |
1255 | MD5Update(&md5c, pktin.body, 8); |
374330e2 |
1256 | MD5Final(session_id, &md5c); |
1257 | |
1258 | for (i=0; i<32; i++) |
1259 | session_key[i] = random_byte(); |
1260 | |
1261 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
1262 | |
dcbde236 |
1263 | rsabuf = smalloc(len); |
374330e2 |
1264 | if (!rsabuf) |
1265 | fatalbox("Out of memory"); |
1266 | |
89ee5268 |
1267 | /* |
1268 | * Verify the host key. |
1269 | */ |
1270 | { |
1271 | /* |
1272 | * First format the key into a string. |
1273 | */ |
1274 | int len = rsastr_len(&hostkey); |
d5859615 |
1275 | char fingerprint[100]; |
dcbde236 |
1276 | char *keystr = smalloc(len); |
89ee5268 |
1277 | if (!keystr) |
1278 | fatalbox("Out of memory"); |
1279 | rsastr_fmt(keystr, &hostkey); |
d5859615 |
1280 | rsa_fingerprint(fingerprint, sizeof(fingerprint), &hostkey); |
d4857987 |
1281 | verify_ssh_host_key(savedhost, savedport, "rsa", keystr, fingerprint); |
dcbde236 |
1282 | sfree(keystr); |
89ee5268 |
1283 | } |
374330e2 |
1284 | |
1285 | for (i=0; i<32; i++) { |
1286 | rsabuf[i] = session_key[i]; |
1287 | if (i < 16) |
1288 | rsabuf[i] ^= session_id[i]; |
1289 | } |
1290 | |
1291 | if (hostkey.bytes > servkey.bytes) { |
1292 | rsaencrypt(rsabuf, 32, &servkey); |
1293 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
1294 | } else { |
1295 | rsaencrypt(rsabuf, 32, &hostkey); |
1296 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
1297 | } |
1298 | |
c5e9c988 |
1299 | logevent("Encrypted session key"); |
1300 | |
bea1ef5f |
1301 | cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH : |
9697bfd2 |
1302 | cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES : |
bea1ef5f |
1303 | SSH_CIPHER_3DES; |
1304 | if ((supported_ciphers_mask & (1 << cipher_type)) == 0) { |
1305 | c_write("Selected cipher not supported, falling back to 3DES\r\n", 53); |
1306 | cipher_type = SSH_CIPHER_3DES; |
1307 | } |
c5e9c988 |
1308 | switch (cipher_type) { |
1309 | case SSH_CIPHER_3DES: logevent("Using 3DES encryption"); break; |
1310 | case SSH_CIPHER_DES: logevent("Using single-DES encryption"); break; |
1311 | case SSH_CIPHER_BLOWFISH: logevent("Using Blowfish encryption"); break; |
1312 | } |
bea1ef5f |
1313 | |
e5574168 |
1314 | send_packet(SSH1_CMSG_SESSION_KEY, |
fb09bf1c |
1315 | PKT_CHAR, cipher_type, |
1316 | PKT_DATA, cookie, 8, |
1317 | PKT_CHAR, (len*8) >> 8, PKT_CHAR, (len*8) & 0xFF, |
1318 | PKT_DATA, rsabuf, len, |
1319 | PKT_INT, 0, |
1320 | PKT_END); |
1321 | |
c5e9c988 |
1322 | logevent("Trying to enable encryption..."); |
374330e2 |
1323 | |
dcbde236 |
1324 | sfree(rsabuf); |
374330e2 |
1325 | |
5e8358ad |
1326 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish_ssh1 : |
9697bfd2 |
1327 | cipher_type == SSH_CIPHER_DES ? &ssh_des : |
bea1ef5f |
1328 | &ssh_3des; |
374330e2 |
1329 | cipher->sesskey(session_key); |
1330 | |
fb09bf1c |
1331 | crWaitUntil(ispkt); |
374330e2 |
1332 | |
8d5de777 |
1333 | if (pktin.type != SSH1_SMSG_SUCCESS) { |
1334 | bombout(("Encryption not successfully enabled")); |
1335 | crReturn(0); |
1336 | } |
374330e2 |
1337 | |
c5e9c988 |
1338 | logevent("Successfully started encryption"); |
1339 | |
374330e2 |
1340 | fflush(stdout); |
1341 | { |
374330e2 |
1342 | static int pos = 0; |
1343 | static char c; |
67779be7 |
1344 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
374330e2 |
1345 | c_write("login as: ", 10); |
67779be7 |
1346 | ssh_send_ok = 1; |
374330e2 |
1347 | while (pos >= 0) { |
fb09bf1c |
1348 | crWaitUntil(!ispkt); |
374330e2 |
1349 | while (inlen--) switch (c = *in++) { |
1350 | case 10: case 13: |
1351 | username[pos] = 0; |
1352 | pos = -1; |
1353 | break; |
1354 | case 8: case 127: |
1355 | if (pos > 0) { |
1356 | c_write("\b \b", 3); |
1357 | pos--; |
1358 | } |
1359 | break; |
1360 | case 21: case 27: |
1361 | while (pos > 0) { |
1362 | c_write("\b \b", 3); |
1363 | pos--; |
1364 | } |
1365 | break; |
1366 | case 3: case 4: |
1367 | random_save_seed(); |
1368 | exit(0); |
1369 | break; |
1370 | default: |
40d24aa6 |
1371 | if (((c >= ' ' && c <= '~') || |
1372 | ((unsigned char)c >= 160)) && pos < 40) { |
374330e2 |
1373 | username[pos++] = c; |
1374 | c_write(&c, 1); |
1375 | } |
1376 | break; |
1377 | } |
1378 | } |
1379 | c_write("\r\n", 2); |
1380 | username[strcspn(username, "\n\r")] = '\0'; |
1381 | } else { |
374330e2 |
1382 | strncpy(username, cfg.username, 99); |
1383 | username[99] = '\0'; |
374330e2 |
1384 | } |
fb09bf1c |
1385 | |
e5574168 |
1386 | send_packet(SSH1_CMSG_USER, PKT_STR, username, PKT_END); |
c5e9c988 |
1387 | { |
3c8e959b |
1388 | char userlog[22+sizeof(username)]; |
c5e9c988 |
1389 | sprintf(userlog, "Sent username \"%s\"", username); |
1390 | logevent(userlog); |
3c8e959b |
1391 | if (flags & FLAG_INTERACTIVE && |
1392 | (!((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)))) { |
1393 | strcat(userlog, "\r\n"); |
1394 | c_write(userlog, strlen(userlog)); |
1395 | } |
c5e9c988 |
1396 | } |
374330e2 |
1397 | } |
1398 | |
fb09bf1c |
1399 | crWaitUntil(ispkt); |
374330e2 |
1400 | |
7cca0d81 |
1401 | tried_publickey = 0; |
1402 | |
e5574168 |
1403 | while (pktin.type == SSH1_SMSG_FAILURE) { |
374330e2 |
1404 | static char password[100]; |
a52f067e |
1405 | static char prompt[200]; |
374330e2 |
1406 | static int pos; |
1407 | static char c; |
ccbfb941 |
1408 | static int pwpkt_type; |
ccbfb941 |
1409 | /* |
1410 | * Show password prompt, having first obtained it via a TIS |
18515c51 |
1411 | * or CryptoCard exchange if we're doing TIS or CryptoCard |
1412 | * authentication. |
ccbfb941 |
1413 | */ |
e5574168 |
1414 | pwpkt_type = SSH1_CMSG_AUTH_PASSWORD; |
5c58ad2d |
1415 | if (agent_exists()) { |
1416 | /* |
1417 | * Attempt RSA authentication using Pageant. |
1418 | */ |
1419 | static unsigned char request[5], *response, *p; |
1420 | static int responselen; |
1421 | static int i, nkeys; |
1422 | static int authed = FALSE; |
1423 | void *r; |
1424 | |
1425 | logevent("Pageant is running. Requesting keys."); |
1426 | |
1427 | /* Request the keys held by the agent. */ |
1428 | PUT_32BIT(request, 1); |
1429 | request[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES; |
1430 | agent_query(request, 5, &r, &responselen); |
1431 | response = (unsigned char *)r; |
1432 | if (response) { |
1433 | p = response + 5; |
1434 | nkeys = GET_32BIT(p); p += 4; |
1435 | { char buf[64]; sprintf(buf, "Pageant has %d keys", nkeys); |
1436 | logevent(buf); } |
1437 | for (i = 0; i < nkeys; i++) { |
1438 | static struct RSAKey key; |
1439 | static Bignum challenge; |
b8bb811a |
1440 | static char *commentp; |
1441 | static int commentlen; |
5c58ad2d |
1442 | |
1443 | { char buf[64]; sprintf(buf, "Trying Pageant key #%d", i); |
1444 | logevent(buf); } |
1445 | p += 4; |
1446 | p += ssh1_read_bignum(p, &key.exponent); |
1447 | p += ssh1_read_bignum(p, &key.modulus); |
b8bb811a |
1448 | commentlen = GET_32BIT(p); p += 4; |
1449 | commentp = p; p += commentlen; |
5c58ad2d |
1450 | send_packet(SSH1_CMSG_AUTH_RSA, |
1451 | PKT_BIGNUM, key.modulus, PKT_END); |
1452 | crWaitUntil(ispkt); |
1453 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1454 | logevent("Key refused"); |
1455 | continue; |
1456 | } |
1457 | logevent("Received RSA challenge"); |
1458 | ssh1_read_bignum(pktin.body, &challenge); |
1459 | { |
1460 | char *agentreq, *q, *ret; |
1461 | int len, retlen; |
1462 | len = 1 + 4; /* message type, bit count */ |
1463 | len += ssh1_bignum_length(key.exponent); |
1464 | len += ssh1_bignum_length(key.modulus); |
1465 | len += ssh1_bignum_length(challenge); |
1466 | len += 16; /* session id */ |
1467 | len += 4; /* response format */ |
dcbde236 |
1468 | agentreq = smalloc(4 + len); |
5c58ad2d |
1469 | PUT_32BIT(agentreq, len); |
1470 | q = agentreq + 4; |
1471 | *q++ = SSH_AGENTC_RSA_CHALLENGE; |
1472 | PUT_32BIT(q, ssh1_bignum_bitcount(key.modulus)); |
1473 | q += 4; |
1474 | q += ssh1_write_bignum(q, key.exponent); |
1475 | q += ssh1_write_bignum(q, key.modulus); |
1476 | q += ssh1_write_bignum(q, challenge); |
1477 | memcpy(q, session_id, 16); q += 16; |
1478 | PUT_32BIT(q, 1); /* response format */ |
1479 | agent_query(agentreq, len+4, &ret, &retlen); |
dcbde236 |
1480 | sfree(agentreq); |
5c58ad2d |
1481 | if (ret) { |
1482 | if (ret[4] == SSH_AGENT_RSA_RESPONSE) { |
1483 | logevent("Sending Pageant's response"); |
1484 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1485 | PKT_DATA, ret+5, 16, PKT_END); |
dcbde236 |
1486 | sfree(ret); |
5c58ad2d |
1487 | crWaitUntil(ispkt); |
1488 | if (pktin.type == SSH1_SMSG_SUCCESS) { |
1489 | logevent("Pageant's response accepted"); |
c4fa2fce |
1490 | if (flags & FLAG_VERBOSE) { |
1491 | c_write("Authenticated using RSA key \"", |
1492 | 29); |
1493 | c_write(commentp, commentlen); |
1494 | c_write("\" from agent\r\n", 14); |
1495 | } |
5c58ad2d |
1496 | authed = TRUE; |
1497 | } else |
1498 | logevent("Pageant's response not accepted"); |
1499 | } else { |
1500 | logevent("Pageant failed to answer challenge"); |
dcbde236 |
1501 | sfree(ret); |
5c58ad2d |
1502 | } |
1503 | } else { |
1504 | logevent("No reply received from Pageant"); |
1505 | } |
1506 | } |
1507 | freebn(key.exponent); |
1508 | freebn(key.modulus); |
1509 | freebn(challenge); |
1510 | if (authed) |
1511 | break; |
1512 | } |
1513 | } |
1514 | if (authed) |
1515 | break; |
1516 | } |
7cca0d81 |
1517 | if (*cfg.keyfile && !tried_publickey) |
1518 | pwpkt_type = SSH1_CMSG_AUTH_RSA; |
fb09bf1c |
1519 | |
a52f067e |
1520 | if (pktin.type == SSH1_SMSG_FAILURE && |
1521 | cfg.try_tis_auth && |
1522 | (supported_auths_mask & (1<<SSH1_AUTH_TIS))) { |
1523 | pwpkt_type = SSH1_CMSG_AUTH_TIS_RESPONSE; |
1524 | logevent("Requested TIS authentication"); |
1525 | send_packet(SSH1_CMSG_AUTH_TIS, PKT_END); |
1526 | crWaitUntil(ispkt); |
1527 | if (pktin.type != SSH1_SMSG_AUTH_TIS_CHALLENGE) { |
1528 | logevent("TIS authentication declined"); |
1529 | if (flags & FLAG_INTERACTIVE) |
1530 | c_write("TIS authentication refused.\r\n", 29); |
1531 | } else { |
1532 | int challengelen = ((pktin.body[0] << 24) | |
1533 | (pktin.body[1] << 16) | |
1534 | (pktin.body[2] << 8) | |
1535 | (pktin.body[3])); |
1536 | logevent("Received TIS challenge"); |
1537 | if (challengelen > sizeof(prompt)-1) |
1538 | challengelen = sizeof(prompt)-1; /* prevent overrun */ |
1539 | memcpy(prompt, pktin.body+4, challengelen); |
1540 | prompt[challengelen] = '\0'; |
1541 | } |
1542 | } |
1543 | if (pktin.type == SSH1_SMSG_FAILURE && |
1544 | cfg.try_tis_auth && |
1545 | (supported_auths_mask & (1<<SSH1_AUTH_CCARD))) { |
1546 | pwpkt_type = SSH1_CMSG_AUTH_CCARD_RESPONSE; |
1547 | logevent("Requested CryptoCard authentication"); |
1548 | send_packet(SSH1_CMSG_AUTH_CCARD, PKT_END); |
1549 | crWaitUntil(ispkt); |
1550 | if (pktin.type != SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
1551 | logevent("CryptoCard authentication declined"); |
1552 | c_write("CryptoCard authentication refused.\r\n", 29); |
1553 | } else { |
1554 | int challengelen = ((pktin.body[0] << 24) | |
1555 | (pktin.body[1] << 16) | |
1556 | (pktin.body[2] << 8) | |
1557 | (pktin.body[3])); |
1558 | logevent("Received CryptoCard challenge"); |
1559 | if (challengelen > sizeof(prompt)-1) |
1560 | challengelen = sizeof(prompt)-1; /* prevent overrun */ |
1561 | memcpy(prompt, pktin.body+4, challengelen); |
1562 | strncpy(prompt + challengelen, "\r\nResponse : ", |
1563 | sizeof(prompt)-challengelen); |
1564 | prompt[sizeof(prompt)-1] = '\0'; |
1565 | } |
1566 | } |
1567 | if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) { |
1568 | sprintf(prompt, "%.90s@%.90s's password: ", |
b585ec46 |
1569 | username, savedhost); |
a52f067e |
1570 | } |
1571 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
1572 | char *comment = NULL; |
1573 | if (flags & FLAG_VERBOSE) |
1574 | c_write("Trying public key authentication.\r\n", 35); |
1575 | if (!rsakey_encrypted(cfg.keyfile, &comment)) { |
1576 | if (flags & FLAG_VERBOSE) |
1577 | c_write("No passphrase required.\r\n", 25); |
1578 | goto tryauth; |
1579 | } |
1580 | sprintf(prompt, "Passphrase for key \"%.100s\": ", comment); |
dcbde236 |
1581 | sfree(comment); |
a52f067e |
1582 | } |
1583 | |
d8426c54 |
1584 | if (ssh_get_password) { |
85ee8208 |
1585 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
1586 | /* |
1587 | * get_password failed to get a password (for |
1588 | * example because one was supplied on the command |
1589 | * line which has already failed to work). |
1590 | * Terminate. |
1591 | */ |
1592 | logevent("No more passwords to try"); |
1593 | ssh_state = SSH_STATE_CLOSED; |
1594 | crReturn(1); |
1595 | } |
fb09bf1c |
1596 | } else { |
a52f067e |
1597 | c_write(prompt, strlen(prompt)); |
7cca0d81 |
1598 | pos = 0; |
67779be7 |
1599 | ssh_send_ok = 1; |
7cca0d81 |
1600 | while (pos >= 0) { |
1601 | crWaitUntil(!ispkt); |
1602 | while (inlen--) switch (c = *in++) { |
1603 | case 10: case 13: |
1604 | password[pos] = 0; |
1605 | pos = -1; |
1606 | break; |
1607 | case 8: case 127: |
1608 | if (pos > 0) |
1609 | pos--; |
1610 | break; |
1611 | case 21: case 27: |
1612 | pos = 0; |
1613 | break; |
1614 | case 3: case 4: |
1615 | random_save_seed(); |
1616 | exit(0); |
1617 | break; |
1618 | default: |
1619 | if (((c >= ' ' && c <= '~') || |
1620 | ((unsigned char)c >= 160)) && pos < sizeof(password)) |
1621 | password[pos++] = c; |
1622 | break; |
1623 | } |
1624 | } |
1625 | c_write("\r\n", 2); |
a52f067e |
1626 | } |
fb09bf1c |
1627 | |
7cca0d81 |
1628 | tryauth: |
1629 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
1630 | /* |
1631 | * Try public key authentication with the specified |
1632 | * key file. |
1633 | */ |
1634 | static struct RSAKey pubkey; |
1635 | static Bignum challenge, response; |
1636 | static int i; |
1637 | static unsigned char buffer[32]; |
1638 | |
1639 | tried_publickey = 1; |
6e522441 |
1640 | i = loadrsakey(cfg.keyfile, &pubkey, NULL, password); |
7cca0d81 |
1641 | if (i == 0) { |
1642 | c_write("Couldn't load public key from ", 30); |
1643 | c_write(cfg.keyfile, strlen(cfg.keyfile)); |
1644 | c_write(".\r\n", 3); |
1645 | continue; /* go and try password */ |
1646 | } |
1647 | if (i == -1) { |
1648 | c_write("Wrong passphrase.\r\n", 19); |
1649 | tried_publickey = 0; |
1650 | continue; /* try again */ |
1651 | } |
1652 | |
1653 | /* |
1654 | * Send a public key attempt. |
1655 | */ |
1656 | send_packet(SSH1_CMSG_AUTH_RSA, |
1657 | PKT_BIGNUM, pubkey.modulus, PKT_END); |
1658 | |
1659 | crWaitUntil(ispkt); |
1660 | if (pktin.type == SSH1_SMSG_FAILURE) { |
a52f067e |
1661 | c_write("Server refused our public key.\r\n", 32); |
7cca0d81 |
1662 | continue; /* go and try password */ |
1663 | } |
8d5de777 |
1664 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1665 | bombout(("Bizarre response to offer of public key")); |
1666 | crReturn(0); |
1667 | } |
7cca0d81 |
1668 | ssh1_read_bignum(pktin.body, &challenge); |
1669 | response = rsadecrypt(challenge, &pubkey); |
1670 | freebn(pubkey.private_exponent); /* burn the evidence */ |
1671 | |
1672 | for (i = 0; i < 32; i += 2) { |
1673 | buffer[i] = response[16-i/2] >> 8; |
1674 | buffer[i+1] = response[16-i/2] & 0xFF; |
1675 | } |
1676 | |
1677 | MD5Init(&md5c); |
1678 | MD5Update(&md5c, buffer, 32); |
1679 | MD5Update(&md5c, session_id, 16); |
1680 | MD5Final(buffer, &md5c); |
1681 | |
1682 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1683 | PKT_DATA, buffer, 16, PKT_END); |
1684 | |
1685 | crWaitUntil(ispkt); |
1686 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1687 | if (flags & FLAG_VERBOSE) |
1688 | c_write("Failed to authenticate with our public key.\r\n", |
1689 | 45); |
7cca0d81 |
1690 | continue; /* go and try password */ |
1691 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1692 | bombout(("Bizarre response to RSA authentication response")); |
1693 | crReturn(0); |
7cca0d81 |
1694 | } |
1695 | |
1696 | break; /* we're through! */ |
1697 | } else { |
1698 | send_packet(pwpkt_type, PKT_STR, password, PKT_END); |
1699 | } |
c5e9c988 |
1700 | logevent("Sent password"); |
374330e2 |
1701 | memset(password, 0, strlen(password)); |
fb09bf1c |
1702 | crWaitUntil(ispkt); |
e5574168 |
1703 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1704 | if (flags & FLAG_VERBOSE) |
1705 | c_write("Access denied\r\n", 15); |
c5e9c988 |
1706 | logevent("Authentication refused"); |
e5574168 |
1707 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
fb09bf1c |
1708 | logevent("Received disconnect request"); |
85ee8208 |
1709 | ssh_state = SSH_STATE_CLOSED; |
1710 | crReturn(1); |
e5574168 |
1711 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1712 | bombout(("Strange packet received, type %d", pktin.type)); |
1713 | crReturn(0); |
374330e2 |
1714 | } |
1715 | } |
1716 | |
c5e9c988 |
1717 | logevent("Authentication successful"); |
1718 | |
fb09bf1c |
1719 | crFinish(1); |
1720 | } |
1721 | |
e5574168 |
1722 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt) { |
fb09bf1c |
1723 | crBegin; |
1724 | |
1725 | random_init(); |
1726 | |
e5574168 |
1727 | while (!do_ssh1_login(in, inlen, ispkt)) { |
fb09bf1c |
1728 | crReturnV; |
85ee8208 |
1729 | } |
1730 | if (ssh_state == SSH_STATE_CLOSED) |
1731 | crReturnV; |
fb09bf1c |
1732 | |
979310f1 |
1733 | if (cfg.agentfwd && agent_exists()) { |
dacbd0e8 |
1734 | logevent("Requesting agent forwarding"); |
1735 | send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING, PKT_END); |
1736 | do { crReturnV; } while (!ispkt); |
1737 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
1738 | bombout(("Protocol confusion")); |
1739 | crReturnV; |
dacbd0e8 |
1740 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
1741 | logevent("Agent forwarding refused"); |
db7d555c |
1742 | } else { |
dacbd0e8 |
1743 | logevent("Agent forwarding enabled"); |
db7d555c |
1744 | ssh_agentfwd_enabled = TRUE; |
1745 | } |
dacbd0e8 |
1746 | } |
1747 | |
fef97f43 |
1748 | if (!cfg.nopty) { |
e5574168 |
1749 | send_packet(SSH1_CMSG_REQUEST_PTY, |
fb09bf1c |
1750 | PKT_STR, cfg.termtype, |
1751 | PKT_INT, rows, PKT_INT, cols, |
1752 | PKT_INT, 0, PKT_INT, 0, |
1753 | PKT_CHAR, 0, |
1754 | PKT_END); |
fef97f43 |
1755 | ssh_state = SSH_STATE_INTERMED; |
1756 | do { crReturnV; } while (!ispkt); |
e5574168 |
1757 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
1758 | bombout(("Protocol confusion")); |
1759 | crReturnV; |
e5574168 |
1760 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
fef97f43 |
1761 | c_write("Server refused to allocate pty\r\n", 32); |
1762 | } |
c5e9c988 |
1763 | logevent("Allocated pty"); |
374330e2 |
1764 | } |
1765 | |
4ba9b64b |
1766 | if (cfg.compression) { |
1767 | send_packet(SSH1_CMSG_REQUEST_COMPRESSION, PKT_INT, 6, PKT_END); |
1768 | do { crReturnV; } while (!ispkt); |
1769 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
1770 | bombout(("Protocol confusion")); |
1771 | crReturnV; |
1772 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
1773 | c_write("Server refused to compress\r\n", 32); |
1774 | } |
1775 | logevent("Started compression"); |
1776 | ssh1_compressing = TRUE; |
1777 | zlib_compress_init(); |
1778 | zlib_decompress_init(); |
1779 | } |
1780 | |
6abbf9e3 |
1781 | if (*cfg.remote_cmd) |
1782 | send_packet(SSH1_CMSG_EXEC_CMD, PKT_STR, cfg.remote_cmd, PKT_END); |
1783 | else |
1784 | send_packet(SSH1_CMSG_EXEC_SHELL, PKT_END); |
c5e9c988 |
1785 | logevent("Started session"); |
374330e2 |
1786 | |
1787 | ssh_state = SSH_STATE_SESSION; |
1788 | if (size_needed) |
1789 | ssh_size(); |
3687d221 |
1790 | if (eof_needed) |
1791 | ssh_special(TS_EOF); |
374330e2 |
1792 | |
8ccc75b0 |
1793 | ssh_send_ok = 1; |
dacbd0e8 |
1794 | ssh_channels = newtree234(ssh_channelcmp); |
6f34e365 |
1795 | begin_session(); |
374330e2 |
1796 | while (1) { |
1797 | crReturnV; |
1798 | if (ispkt) { |
e5574168 |
1799 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
1800 | pktin.type == SSH1_SMSG_STDERR_DATA) { |
fb09bf1c |
1801 | long len = GET_32BIT(pktin.body); |
fe50e814 |
1802 | from_backend(pktin.type == SSH1_SMSG_STDERR_DATA, |
1803 | pktin.body+4, len); |
e5574168 |
1804 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
21248260 |
1805 | ssh_state = SSH_STATE_CLOSED; |
c5e9c988 |
1806 | logevent("Received disconnect request"); |
3257deae |
1807 | crReturnV; |
dacbd0e8 |
1808 | } else if (pktin.type == SSH1_SMSG_AGENT_OPEN) { |
1809 | /* Remote side is trying to open a channel to talk to our |
1810 | * agent. Give them back a local channel number. */ |
db7d555c |
1811 | unsigned i; |
dacbd0e8 |
1812 | struct ssh_channel *c; |
1813 | enum234 e; |
db7d555c |
1814 | |
1815 | /* Refuse if agent forwarding is disabled. */ |
1816 | if (!ssh_agentfwd_enabled) { |
1817 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
1818 | PKT_INT, GET_32BIT(pktin.body), |
1819 | PKT_END); |
1820 | } else { |
1821 | i = 1; |
1822 | for (c = first234(ssh_channels, &e); c; c = next234(&e)) { |
1823 | if (c->localid > i) |
1824 | break; /* found a free number */ |
1825 | i = c->localid + 1; |
1826 | } |
dcbde236 |
1827 | c = smalloc(sizeof(struct ssh_channel)); |
db7d555c |
1828 | c->remoteid = GET_32BIT(pktin.body); |
1829 | c->localid = i; |
1830 | c->closes = 0; |
1831 | c->type = SSH1_SMSG_AGENT_OPEN;/* identify channel type */ |
1832 | c->u.a.lensofar = 0; |
1833 | add234(ssh_channels, c); |
1834 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
1835 | PKT_INT, c->remoteid, PKT_INT, c->localid, |
1836 | PKT_END); |
1837 | } |
1838 | } else if (pktin.type == SSH1_MSG_CHANNEL_CLOSE || |
1839 | pktin.type == SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION) { |
dacbd0e8 |
1840 | /* Remote side closes a channel. */ |
d211621f |
1841 | unsigned i = GET_32BIT(pktin.body); |
dacbd0e8 |
1842 | struct ssh_channel *c; |
1843 | c = find234(ssh_channels, &i, ssh_channelfind); |
1844 | if (c) { |
1845 | int closetype; |
1846 | closetype = (pktin.type == SSH1_MSG_CHANNEL_CLOSE ? 1 : 2); |
1847 | send_packet(pktin.type, PKT_INT, c->remoteid, PKT_END); |
1848 | c->closes |= closetype; |
1849 | if (c->closes == 3) { |
1850 | del234(ssh_channels, c); |
dcbde236 |
1851 | sfree(c); |
dacbd0e8 |
1852 | } |
1853 | } |
1854 | } else if (pktin.type == SSH1_MSG_CHANNEL_DATA) { |
1855 | /* Data sent down one of our channels. */ |
1856 | int i = GET_32BIT(pktin.body); |
1857 | int len = GET_32BIT(pktin.body+4); |
1858 | unsigned char *p = pktin.body+8; |
1859 | struct ssh_channel *c; |
1860 | c = find234(ssh_channels, &i, ssh_channelfind); |
1861 | if (c) { |
1862 | switch(c->type) { |
1863 | case SSH1_SMSG_AGENT_OPEN: |
1864 | /* Data for an agent message. Buffer it. */ |
1865 | while (len > 0) { |
1866 | if (c->u.a.lensofar < 4) { |
1867 | int l = min(4 - c->u.a.lensofar, len); |
1868 | memcpy(c->u.a.msglen + c->u.a.lensofar, p, l); |
1869 | p += l; len -= l; c->u.a.lensofar += l; |
1870 | } |
1871 | if (c->u.a.lensofar == 4) { |
1872 | c->u.a.totallen = 4 + GET_32BIT(c->u.a.msglen); |
dcbde236 |
1873 | c->u.a.message = smalloc(c->u.a.totallen); |
dacbd0e8 |
1874 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
1875 | } |
1876 | if (c->u.a.lensofar >= 4 && len > 0) { |
1877 | int l = min(c->u.a.totallen - c->u.a.lensofar, len); |
1878 | memcpy(c->u.a.message + c->u.a.lensofar, p, l); |
1879 | p += l; len -= l; c->u.a.lensofar += l; |
1880 | } |
1881 | if (c->u.a.lensofar == c->u.a.totallen) { |
1882 | void *reply, *sentreply; |
1883 | int replylen; |
1884 | agent_query(c->u.a.message, c->u.a.totallen, |
1885 | &reply, &replylen); |
1886 | if (reply) |
1887 | sentreply = reply; |
1888 | else { |
1889 | /* Fake SSH_AGENT_FAILURE. */ |
1890 | sentreply = "\0\0\0\1\5"; |
1891 | replylen = 5; |
1892 | } |
1893 | send_packet(SSH1_MSG_CHANNEL_DATA, |
1894 | PKT_INT, c->remoteid, |
1895 | PKT_INT, replylen, |
1896 | PKT_DATA, sentreply, replylen, |
1897 | PKT_END); |
1898 | if (reply) |
dcbde236 |
1899 | sfree(reply); |
1900 | sfree(c->u.a.message); |
dacbd0e8 |
1901 | c->u.a.lensofar = 0; |
1902 | } |
1903 | } |
1904 | break; |
1905 | } |
1906 | } |
e5574168 |
1907 | } else if (pktin.type == SSH1_SMSG_SUCCESS) { |
972a41c8 |
1908 | /* may be from EXEC_SHELL on some servers */ |
e5574168 |
1909 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
972a41c8 |
1910 | /* may be from EXEC_SHELL on some servers |
374330e2 |
1911 | * if no pty is available or in other odd cases. Ignore */ |
e5574168 |
1912 | } else if (pktin.type == SSH1_SMSG_EXIT_STATUS) { |
1913 | send_packet(SSH1_CMSG_EXIT_CONFIRMATION, PKT_END); |
374330e2 |
1914 | } else { |
8d5de777 |
1915 | bombout(("Strange packet received: type %d", pktin.type)); |
1916 | crReturnV; |
374330e2 |
1917 | } |
1918 | } else { |
8df7a775 |
1919 | while (inlen > 0) { |
1920 | int len = min(inlen, 512); |
1921 | send_packet(SSH1_CMSG_STDIN_DATA, |
1922 | PKT_INT, len, PKT_DATA, in, len, PKT_END); |
1923 | in += len; |
1924 | inlen -= len; |
1925 | } |
374330e2 |
1926 | } |
1927 | } |
1928 | |
1929 | crFinishV; |
1930 | } |
1931 | |
1932 | /* |
e5574168 |
1933 | * Utility routine for decoding comma-separated strings in KEXINIT. |
1934 | */ |
75cab814 |
1935 | static int in_commasep_string(char *needle, char *haystack, int haylen) { |
e5574168 |
1936 | int needlen = strlen(needle); |
1937 | while (1) { |
1938 | /* |
1939 | * Is it at the start of the string? |
1940 | */ |
1941 | if (haylen >= needlen && /* haystack is long enough */ |
1942 | !memcmp(needle, haystack, needlen) && /* initial match */ |
1943 | (haylen == needlen || haystack[needlen] == ',') |
1944 | /* either , or EOS follows */ |
1945 | ) |
1946 | return 1; |
1947 | /* |
1948 | * If not, search for the next comma and resume after that. |
1949 | * If no comma found, terminate. |
1950 | */ |
1951 | while (haylen > 0 && *haystack != ',') |
1952 | haylen--, haystack++; |
1953 | if (haylen == 0) |
1954 | return 0; |
1955 | haylen--, haystack++; /* skip over comma itself */ |
1956 | } |
1957 | } |
1958 | |
1959 | /* |
d39f364a |
1960 | * SSH2 key creation method. |
1961 | */ |
75cab814 |
1962 | static void ssh2_mkkey(Bignum K, char *H, char chr, char *keyspace) { |
d39f364a |
1963 | SHA_State s; |
1964 | /* First 20 bytes. */ |
1965 | SHA_Init(&s); |
1966 | sha_mpint(&s, K); |
1967 | SHA_Bytes(&s, H, 20); |
1968 | SHA_Bytes(&s, &chr, 1); |
1969 | SHA_Bytes(&s, H, 20); |
1970 | SHA_Final(&s, keyspace); |
1971 | /* Next 20 bytes. */ |
1972 | SHA_Init(&s); |
1973 | sha_mpint(&s, K); |
1974 | SHA_Bytes(&s, H, 20); |
1975 | SHA_Bytes(&s, keyspace, 20); |
1976 | SHA_Final(&s, keyspace+20); |
1977 | } |
1978 | |
1979 | /* |
7cca0d81 |
1980 | * Handle the SSH2 transport layer. |
e5574168 |
1981 | */ |
7cca0d81 |
1982 | static int do_ssh2_transport(unsigned char *in, int inlen, int ispkt) |
e5574168 |
1983 | { |
1984 | static int i, len; |
1985 | static char *str; |
1986 | static Bignum e, f, K; |
7591b9ff |
1987 | static const struct ssh_mac **maclist; |
8b2715b2 |
1988 | static int nmacs; |
57476f6b |
1989 | static const struct ssh_cipher *cscipher_tobe = NULL; |
1990 | static const struct ssh_cipher *sccipher_tobe = NULL; |
1991 | static const struct ssh_mac *csmac_tobe = NULL; |
1992 | static const struct ssh_mac *scmac_tobe = NULL; |
1993 | static const struct ssh_compress *cscomp_tobe = NULL; |
1994 | static const struct ssh_compress *sccomp_tobe = NULL; |
d5859615 |
1995 | static char *hostkeydata, *sigdata, *keystr, *fingerprint; |
e5574168 |
1996 | static int hostkeylen, siglen; |
e055a386 |
1997 | static void *hkey; /* actual host key */ |
e5574168 |
1998 | static unsigned char exchange_hash[20]; |
d39f364a |
1999 | static unsigned char keyspace[40]; |
57476f6b |
2000 | static const struct ssh_cipher *preferred_cipher; |
4ba9b64b |
2001 | static const struct ssh_compress *preferred_comp; |
0db56f73 |
2002 | static int first_kex; |
e5574168 |
2003 | |
2004 | crBegin; |
7cca0d81 |
2005 | random_init(); |
0db56f73 |
2006 | first_kex = 1; |
e5574168 |
2007 | |
5e8358ad |
2008 | /* |
4ba9b64b |
2009 | * Set up the preferred cipher and compression. |
5e8358ad |
2010 | */ |
2011 | if (cfg.cipher == CIPHER_BLOWFISH) { |
57476f6b |
2012 | preferred_cipher = &ssh_blowfish_ssh2; |
5e8358ad |
2013 | } else if (cfg.cipher == CIPHER_DES) { |
2014 | logevent("Single DES not supported in SSH2; using 3DES"); |
57476f6b |
2015 | preferred_cipher = &ssh_3des_ssh2; |
5e8358ad |
2016 | } else if (cfg.cipher == CIPHER_3DES) { |
57476f6b |
2017 | preferred_cipher = &ssh_3des_ssh2; |
5e8358ad |
2018 | } else { |
2019 | /* Shouldn't happen, but we do want to initialise to _something_. */ |
57476f6b |
2020 | preferred_cipher = &ssh_3des_ssh2; |
5e8358ad |
2021 | } |
4ba9b64b |
2022 | if (cfg.compression) |
2023 | preferred_comp = &ssh_zlib; |
2024 | else |
2025 | preferred_comp = &ssh_comp_none; |
5e8358ad |
2026 | |
7591b9ff |
2027 | /* |
2028 | * Be prepared to work around the buggy MAC problem. |
2029 | */ |
2030 | if (cfg.buggymac) |
8b2715b2 |
2031 | maclist = buggymacs, nmacs = lenof(buggymacs); |
7591b9ff |
2032 | else |
8b2715b2 |
2033 | maclist = macs, nmacs = lenof(macs); |
7591b9ff |
2034 | |
7cca0d81 |
2035 | begin_key_exchange: |
e5574168 |
2036 | /* |
2037 | * Construct and send our key exchange packet. |
2038 | */ |
2039 | ssh2_pkt_init(SSH2_MSG_KEXINIT); |
2040 | for (i = 0; i < 16; i++) |
2041 | ssh2_pkt_addbyte((unsigned char)random_byte()); |
2042 | /* List key exchange algorithms. */ |
2043 | ssh2_pkt_addstring_start(); |
2044 | for (i = 0; i < lenof(kex_algs); i++) { |
2045 | ssh2_pkt_addstring_str(kex_algs[i]->name); |
2046 | if (i < lenof(kex_algs)-1) |
2047 | ssh2_pkt_addstring_str(","); |
2048 | } |
2049 | /* List server host key algorithms. */ |
2050 | ssh2_pkt_addstring_start(); |
2051 | for (i = 0; i < lenof(hostkey_algs); i++) { |
2052 | ssh2_pkt_addstring_str(hostkey_algs[i]->name); |
2053 | if (i < lenof(hostkey_algs)-1) |
2054 | ssh2_pkt_addstring_str(","); |
2055 | } |
2056 | /* List client->server encryption algorithms. */ |
2057 | ssh2_pkt_addstring_start(); |
729e54b4 |
2058 | for (i = 0; i < lenof(ciphers)+1; i++) { |
2059 | const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1]; |
57476f6b |
2060 | ssh2_pkt_addstring_str(c->name); |
729e54b4 |
2061 | if (i < lenof(ciphers)) |
e5574168 |
2062 | ssh2_pkt_addstring_str(","); |
2063 | } |
2064 | /* List server->client encryption algorithms. */ |
2065 | ssh2_pkt_addstring_start(); |
729e54b4 |
2066 | for (i = 0; i < lenof(ciphers)+1; i++) { |
2067 | const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1]; |
57476f6b |
2068 | ssh2_pkt_addstring_str(c->name); |
729e54b4 |
2069 | if (i < lenof(ciphers)) |
e5574168 |
2070 | ssh2_pkt_addstring_str(","); |
2071 | } |
2072 | /* List client->server MAC algorithms. */ |
2073 | ssh2_pkt_addstring_start(); |
8b2715b2 |
2074 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2075 | ssh2_pkt_addstring_str(maclist[i]->name); |
8b2715b2 |
2076 | if (i < nmacs-1) |
e5574168 |
2077 | ssh2_pkt_addstring_str(","); |
2078 | } |
2079 | /* List server->client MAC algorithms. */ |
2080 | ssh2_pkt_addstring_start(); |
8b2715b2 |
2081 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2082 | ssh2_pkt_addstring_str(maclist[i]->name); |
8b2715b2 |
2083 | if (i < nmacs-1) |
e5574168 |
2084 | ssh2_pkt_addstring_str(","); |
2085 | } |
2086 | /* List client->server compression algorithms. */ |
2087 | ssh2_pkt_addstring_start(); |
4ba9b64b |
2088 | for (i = 0; i < lenof(compressions)+1; i++) { |
2089 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2090 | ssh2_pkt_addstring_str(c->name); |
2091 | if (i < lenof(compressions)) |
e5574168 |
2092 | ssh2_pkt_addstring_str(","); |
2093 | } |
2094 | /* List server->client compression algorithms. */ |
2095 | ssh2_pkt_addstring_start(); |
4ba9b64b |
2096 | for (i = 0; i < lenof(compressions)+1; i++) { |
2097 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2098 | ssh2_pkt_addstring_str(c->name); |
2099 | if (i < lenof(compressions)) |
e5574168 |
2100 | ssh2_pkt_addstring_str(","); |
2101 | } |
2102 | /* List client->server languages. Empty list. */ |
2103 | ssh2_pkt_addstring_start(); |
2104 | /* List server->client languages. Empty list. */ |
2105 | ssh2_pkt_addstring_start(); |
2106 | /* First KEX packet does _not_ follow, because we're not that brave. */ |
2107 | ssh2_pkt_addbool(FALSE); |
2108 | /* Reserved. */ |
2109 | ssh2_pkt_adduint32(0); |
0db56f73 |
2110 | |
2111 | exhash = exhashbase; |
e5574168 |
2112 | sha_string(&exhash, pktout.data+5, pktout.length-5); |
0db56f73 |
2113 | |
e5574168 |
2114 | ssh2_pkt_send(); |
2115 | |
2116 | if (!ispkt) crWaitUntil(ispkt); |
2117 | sha_string(&exhash, pktin.data+5, pktin.length-5); |
2118 | |
2119 | /* |
2120 | * Now examine the other side's KEXINIT to see what we're up |
2121 | * to. |
2122 | */ |
7cca0d81 |
2123 | if (pktin.type != SSH2_MSG_KEXINIT) { |
8d5de777 |
2124 | bombout(("expected key exchange packet from server")); |
2125 | crReturn(0); |
7cca0d81 |
2126 | } |
e5574168 |
2127 | kex = NULL; hostkey = NULL; cscipher_tobe = NULL; sccipher_tobe = NULL; |
2128 | csmac_tobe = NULL; scmac_tobe = NULL; cscomp_tobe = NULL; sccomp_tobe = NULL; |
2129 | pktin.savedpos += 16; /* skip garbage cookie */ |
2130 | ssh2_pkt_getstring(&str, &len); /* key exchange algorithms */ |
2131 | for (i = 0; i < lenof(kex_algs); i++) { |
2132 | if (in_commasep_string(kex_algs[i]->name, str, len)) { |
2133 | kex = kex_algs[i]; |
2134 | break; |
2135 | } |
2136 | } |
2137 | ssh2_pkt_getstring(&str, &len); /* host key algorithms */ |
2138 | for (i = 0; i < lenof(hostkey_algs); i++) { |
2139 | if (in_commasep_string(hostkey_algs[i]->name, str, len)) { |
2140 | hostkey = hostkey_algs[i]; |
2141 | break; |
2142 | } |
2143 | } |
2144 | ssh2_pkt_getstring(&str, &len); /* client->server cipher */ |
729e54b4 |
2145 | for (i = 0; i < lenof(ciphers)+1; i++) { |
2146 | const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1]; |
57476f6b |
2147 | if (in_commasep_string(c->name, str, len)) { |
729e54b4 |
2148 | cscipher_tobe = c; |
e5574168 |
2149 | break; |
2150 | } |
2151 | } |
2152 | ssh2_pkt_getstring(&str, &len); /* server->client cipher */ |
729e54b4 |
2153 | for (i = 0; i < lenof(ciphers)+1; i++) { |
2154 | const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1]; |
57476f6b |
2155 | if (in_commasep_string(c->name, str, len)) { |
729e54b4 |
2156 | sccipher_tobe = c; |
e5574168 |
2157 | break; |
2158 | } |
2159 | } |
2160 | ssh2_pkt_getstring(&str, &len); /* client->server mac */ |
8b2715b2 |
2161 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2162 | if (in_commasep_string(maclist[i]->name, str, len)) { |
2163 | csmac_tobe = maclist[i]; |
e5574168 |
2164 | break; |
2165 | } |
2166 | } |
2167 | ssh2_pkt_getstring(&str, &len); /* server->client mac */ |
8b2715b2 |
2168 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2169 | if (in_commasep_string(maclist[i]->name, str, len)) { |
2170 | scmac_tobe = maclist[i]; |
e5574168 |
2171 | break; |
2172 | } |
2173 | } |
2174 | ssh2_pkt_getstring(&str, &len); /* client->server compression */ |
4ba9b64b |
2175 | for (i = 0; i < lenof(compressions)+1; i++) { |
2176 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2177 | if (in_commasep_string(c->name, str, len)) { |
2178 | cscomp_tobe = c; |
e5574168 |
2179 | break; |
2180 | } |
2181 | } |
2182 | ssh2_pkt_getstring(&str, &len); /* server->client compression */ |
4ba9b64b |
2183 | for (i = 0; i < lenof(compressions)+1; i++) { |
2184 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2185 | if (in_commasep_string(c->name, str, len)) { |
2186 | sccomp_tobe = c; |
e5574168 |
2187 | break; |
2188 | } |
2189 | } |
e5574168 |
2190 | |
2191 | /* |
2192 | * Currently we only support Diffie-Hellman and DSS, so let's |
2193 | * bomb out if those aren't selected. |
2194 | */ |
8d5de777 |
2195 | if (kex != &ssh_diffiehellman || hostkey != &ssh_dss) { |
2196 | bombout(("internal fault: chaos in SSH 2 transport layer")); |
2197 | crReturn(0); |
2198 | } |
e5574168 |
2199 | |
2200 | /* |
2201 | * Now we begin the fun. Generate and send e for Diffie-Hellman. |
2202 | */ |
2203 | e = dh_create_e(); |
e5574168 |
2204 | ssh2_pkt_init(SSH2_MSG_KEXDH_INIT); |
2205 | ssh2_pkt_addmp(e); |
2206 | ssh2_pkt_send(); |
2207 | |
2208 | crWaitUntil(ispkt); |
7cca0d81 |
2209 | if (pktin.type != SSH2_MSG_KEXDH_REPLY) { |
8d5de777 |
2210 | bombout(("expected key exchange packet from server")); |
2211 | crReturn(0); |
7cca0d81 |
2212 | } |
e5574168 |
2213 | ssh2_pkt_getstring(&hostkeydata, &hostkeylen); |
2214 | f = ssh2_pkt_getmp(); |
e5574168 |
2215 | ssh2_pkt_getstring(&sigdata, &siglen); |
2216 | |
2217 | K = dh_find_K(f); |
e5574168 |
2218 | |
2219 | sha_string(&exhash, hostkeydata, hostkeylen); |
2220 | sha_mpint(&exhash, e); |
2221 | sha_mpint(&exhash, f); |
2222 | sha_mpint(&exhash, K); |
2223 | SHA_Final(&exhash, exchange_hash); |
2224 | |
7cca0d81 |
2225 | #if 0 |
e5574168 |
2226 | debug(("Exchange hash is:\r\n")); |
2227 | for (i = 0; i < 20; i++) |
2228 | debug((" %02x", exchange_hash[i])); |
2229 | debug(("\r\n")); |
7cca0d81 |
2230 | #endif |
2231 | |
e055a386 |
2232 | hkey = hostkey->newkey(hostkeydata, hostkeylen); |
2233 | if (!hostkey->verifysig(hkey, sigdata, siglen, exchange_hash, 20)) { |
8d5de777 |
2234 | bombout(("Server failed host key check")); |
2235 | crReturn(0); |
2236 | } |
e5574168 |
2237 | |
2238 | /* |
7cca0d81 |
2239 | * Expect SSH2_MSG_NEWKEYS from server. |
d39f364a |
2240 | */ |
7cca0d81 |
2241 | crWaitUntil(ispkt); |
8d5de777 |
2242 | if (pktin.type != SSH2_MSG_NEWKEYS) { |
2243 | bombout(("expected new-keys packet from server")); |
2244 | crReturn(0); |
2245 | } |
d39f364a |
2246 | |
2247 | /* |
7cca0d81 |
2248 | * Authenticate remote host: verify host key. (We've already |
2249 | * checked the signature of the exchange hash.) |
e5574168 |
2250 | */ |
e055a386 |
2251 | keystr = hostkey->fmtkey(hkey); |
2252 | fingerprint = hostkey->fingerprint(hkey); |
d4857987 |
2253 | verify_ssh_host_key(savedhost, savedport, hostkey->keytype, |
2254 | keystr, fingerprint); |
d5859615 |
2255 | logevent("Host key fingerprint is:"); |
2256 | logevent(fingerprint); |
dcbde236 |
2257 | sfree(fingerprint); |
2258 | sfree(keystr); |
e055a386 |
2259 | hostkey->freekey(hkey); |
d39f364a |
2260 | |
2261 | /* |
7cca0d81 |
2262 | * Send SSH2_MSG_NEWKEYS. |
d39f364a |
2263 | */ |
2264 | ssh2_pkt_init(SSH2_MSG_NEWKEYS); |
2265 | ssh2_pkt_send(); |
d39f364a |
2266 | |
2267 | /* |
2268 | * Create and initialise session keys. |
2269 | */ |
2270 | cscipher = cscipher_tobe; |
2271 | sccipher = sccipher_tobe; |
2272 | csmac = csmac_tobe; |
2273 | scmac = scmac_tobe; |
2274 | cscomp = cscomp_tobe; |
2275 | sccomp = sccomp_tobe; |
4ba9b64b |
2276 | cscomp->compress_init(); |
2277 | sccomp->decompress_init(); |
d39f364a |
2278 | /* |
2279 | * Set IVs after keys. |
2280 | */ |
2281 | ssh2_mkkey(K, exchange_hash, 'C', keyspace); cscipher->setcskey(keyspace); |
21d7754f |
2282 | ssh2_mkkey(K, exchange_hash, 'D', keyspace); sccipher->setsckey(keyspace); |
d39f364a |
2283 | ssh2_mkkey(K, exchange_hash, 'A', keyspace); cscipher->setcsiv(keyspace); |
2284 | ssh2_mkkey(K, exchange_hash, 'B', keyspace); sccipher->setsciv(keyspace); |
2285 | ssh2_mkkey(K, exchange_hash, 'E', keyspace); csmac->setcskey(keyspace); |
2286 | ssh2_mkkey(K, exchange_hash, 'F', keyspace); scmac->setsckey(keyspace); |
2287 | |
033b4cef |
2288 | /* |
0db56f73 |
2289 | * If this is the first key exchange phase, we must pass the |
2290 | * SSH2_MSG_NEWKEYS packet to the next layer, not because it |
2291 | * wants to see it but because it will need time to initialise |
2292 | * itself before it sees an actual packet. In subsequent key |
2293 | * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because |
2294 | * it would only confuse the layer above. |
2295 | */ |
2296 | if (!first_kex) { |
2297 | crReturn(0); |
2298 | } |
2299 | first_kex = 0; |
2300 | |
2301 | /* |
7cca0d81 |
2302 | * Now we're encrypting. Begin returning 1 to the protocol main |
2303 | * function so that other things can run on top of the |
2304 | * transport. If we ever see a KEXINIT, we must go back to the |
2305 | * start. |
033b4cef |
2306 | */ |
7cca0d81 |
2307 | do { |
2308 | crReturn(1); |
2309 | } while (!(ispkt && pktin.type == SSH2_MSG_KEXINIT)); |
2310 | goto begin_key_exchange; |
e5574168 |
2311 | |
2312 | crFinish(1); |
2313 | } |
2314 | |
7cca0d81 |
2315 | /* |
2316 | * Handle the SSH2 userauth and connection layers. |
2317 | */ |
2318 | static void do_ssh2_authconn(unsigned char *in, int inlen, int ispkt) |
2319 | { |
7cca0d81 |
2320 | static unsigned long remote_winsize; |
2321 | static unsigned long remote_maxpkt; |
2322 | |
e5574168 |
2323 | crBegin; |
2324 | |
7cca0d81 |
2325 | /* |
2326 | * Request userauth protocol, and await a response to it. |
2327 | */ |
2328 | ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST); |
2329 | ssh2_pkt_addstring("ssh-userauth"); |
2330 | ssh2_pkt_send(); |
2331 | crWaitUntilV(ispkt); |
8d5de777 |
2332 | if (pktin.type != SSH2_MSG_SERVICE_ACCEPT) { |
2333 | bombout(("Server refused user authentication protocol")); |
2334 | crReturnV; |
2335 | } |
7cca0d81 |
2336 | |
2337 | /* |
2338 | * FIXME: currently we support only password authentication. |
2339 | * (This places us technically in violation of the SSH2 spec. |
2340 | * We must fix this.) |
2341 | */ |
2342 | while (1) { |
2343 | /* |
2344 | * Get a username and a password. |
2345 | */ |
2346 | static char username[100]; |
2347 | static char password[100]; |
2348 | static int pos = 0; |
2349 | static char c; |
e5574168 |
2350 | |
67779be7 |
2351 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
7cca0d81 |
2352 | c_write("login as: ", 10); |
67779be7 |
2353 | ssh_send_ok = 1; |
7cca0d81 |
2354 | while (pos >= 0) { |
2355 | crWaitUntilV(!ispkt); |
2356 | while (inlen--) switch (c = *in++) { |
2357 | case 10: case 13: |
2358 | username[pos] = 0; |
2359 | pos = -1; |
2360 | break; |
2361 | case 8: case 127: |
2362 | if (pos > 0) { |
2363 | c_write("\b \b", 3); |
2364 | pos--; |
2365 | } |
2366 | break; |
2367 | case 21: case 27: |
2368 | while (pos > 0) { |
2369 | c_write("\b \b", 3); |
2370 | pos--; |
2371 | } |
2372 | break; |
2373 | case 3: case 4: |
2374 | random_save_seed(); |
2375 | exit(0); |
2376 | break; |
2377 | default: |
2378 | if (((c >= ' ' && c <= '~') || |
2379 | ((unsigned char)c >= 160)) && pos < 40) { |
2380 | username[pos++] = c; |
2381 | c_write(&c, 1); |
2382 | } |
2383 | break; |
2384 | } |
2385 | } |
2386 | c_write("\r\n", 2); |
2387 | username[strcspn(username, "\n\r")] = '\0'; |
2388 | } else { |
2389 | char stuff[200]; |
2390 | strncpy(username, cfg.username, 99); |
2391 | username[99] = '\0'; |
67779be7 |
2392 | if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) { |
7cca0d81 |
2393 | sprintf(stuff, "Using username \"%s\".\r\n", username); |
2394 | c_write(stuff, strlen(stuff)); |
2395 | } |
2396 | } |
2397 | |
d8426c54 |
2398 | if (ssh_get_password) { |
7cca0d81 |
2399 | char prompt[200]; |
b585ec46 |
2400 | sprintf(prompt, "%.90s@%.90s's password: ", username, savedhost); |
7cca0d81 |
2401 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
2402 | /* |
2403 | * get_password failed to get a password (for |
2404 | * example because one was supplied on the command |
2405 | * line which has already failed to work). |
2406 | * Terminate. |
2407 | */ |
2408 | logevent("No more passwords to try"); |
2409 | ssh_state = SSH_STATE_CLOSED; |
2410 | crReturnV; |
2411 | } |
2412 | } else { |
2413 | c_write("password: ", 10); |
67779be7 |
2414 | ssh_send_ok = 1; |
7cca0d81 |
2415 | |
2416 | pos = 0; |
2417 | while (pos >= 0) { |
2418 | crWaitUntilV(!ispkt); |
2419 | while (inlen--) switch (c = *in++) { |
2420 | case 10: case 13: |
2421 | password[pos] = 0; |
2422 | pos = -1; |
2423 | break; |
2424 | case 8: case 127: |
2425 | if (pos > 0) |
2426 | pos--; |
2427 | break; |
2428 | case 21: case 27: |
2429 | pos = 0; |
2430 | break; |
2431 | case 3: case 4: |
2432 | random_save_seed(); |
2433 | exit(0); |
2434 | break; |
2435 | default: |
2436 | if (((c >= ' ' && c <= '~') || |
2437 | ((unsigned char)c >= 160)) && pos < 40) |
2438 | password[pos++] = c; |
2439 | break; |
2440 | } |
2441 | } |
2442 | c_write("\r\n", 2); |
2443 | } |
2444 | |
2445 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
2446 | ssh2_pkt_addstring(username); |
2447 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
2448 | ssh2_pkt_addstring("password"); |
2449 | ssh2_pkt_addbool(FALSE); |
2450 | ssh2_pkt_addstring(password); |
2451 | ssh2_pkt_send(); |
2452 | |
2453 | crWaitUntilV(ispkt); |
2454 | if (pktin.type != SSH2_MSG_USERAUTH_SUCCESS) { |
2455 | c_write("Access denied\r\n", 15); |
2456 | logevent("Authentication refused"); |
2457 | } else |
2458 | break; |
2459 | } |
2460 | |
2461 | /* |
2462 | * Now we're authenticated for the connection protocol. The |
2463 | * connection protocol will automatically have started at this |
2464 | * point; there's no need to send SERVICE_REQUEST. |
2465 | */ |
2466 | |
2467 | /* |
2468 | * So now create a channel with a session in it. |
2469 | */ |
dcbde236 |
2470 | mainchan = smalloc(sizeof(struct ssh_channel)); |
d211621f |
2471 | mainchan->localid = 100; /* as good as any */ |
7cca0d81 |
2472 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
2473 | ssh2_pkt_addstring("session"); |
d211621f |
2474 | ssh2_pkt_adduint32(mainchan->localid); |
cf6e59d6 |
2475 | ssh2_pkt_adduint32(0x8000UL); /* our window size */ |
d211621f |
2476 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
7cca0d81 |
2477 | ssh2_pkt_send(); |
2478 | crWaitUntilV(ispkt); |
2479 | if (pktin.type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) { |
8d5de777 |
2480 | bombout(("Server refused to open a session")); |
2481 | crReturnV; |
7cca0d81 |
2482 | /* FIXME: error data comes back in FAILURE packet */ |
2483 | } |
d211621f |
2484 | if (ssh2_pkt_getuint32() != mainchan->localid) { |
8d5de777 |
2485 | bombout(("Server's channel confirmation cited wrong channel")); |
2486 | crReturnV; |
7cca0d81 |
2487 | } |
d211621f |
2488 | mainchan->remoteid = ssh2_pkt_getuint32(); |
2489 | mainchan->u.v2.remwindow = ssh2_pkt_getuint32(); |
2490 | mainchan->u.v2.remmaxpkt = ssh2_pkt_getuint32(); |
2491 | mainchan->u.v2.outbuffer = NULL; |
2492 | mainchan->u.v2.outbuflen = mainchan->u.v2.outbufsize = 0; |
7cca0d81 |
2493 | logevent("Opened channel for session"); |
2494 | |
2495 | /* |
2496 | * Now allocate a pty for the session. |
2497 | */ |
67779be7 |
2498 | if (!cfg.nopty) { |
2499 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
2500 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
2501 | ssh2_pkt_addstring("pty-req"); |
2502 | ssh2_pkt_addbool(1); /* want reply */ |
2503 | ssh2_pkt_addstring(cfg.termtype); |
2504 | ssh2_pkt_adduint32(cols); |
2505 | ssh2_pkt_adduint32(rows); |
2506 | ssh2_pkt_adduint32(0); /* pixel width */ |
2507 | ssh2_pkt_adduint32(0); /* pixel height */ |
2508 | ssh2_pkt_addstring_start(); |
2509 | ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */ |
2510 | ssh2_pkt_send(); |
6e48c3fe |
2511 | ssh_state = SSH_STATE_INTERMED; |
7cca0d81 |
2512 | |
67779be7 |
2513 | do { |
2514 | crWaitUntilV(ispkt); |
2515 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
2516 | /* FIXME: be able to handle other channels here */ |
2517 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2518 | continue; /* wrong channel */ |
2519 | mainchan->u.v2.remwindow += ssh2_pkt_getuint32(); |
2520 | } |
2521 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
7cca0d81 |
2522 | |
67779be7 |
2523 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
2524 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
2525 | bombout(("Server got confused by pty request")); |
2526 | crReturnV; |
67779be7 |
2527 | } |
2528 | c_write("Server refused to allocate pty\r\n", 32); |
2529 | } else { |
2530 | logevent("Allocated pty"); |
7cca0d81 |
2531 | } |
7cca0d81 |
2532 | } |
2533 | |
2534 | /* |
67779be7 |
2535 | * Start a shell or a remote command. |
7cca0d81 |
2536 | */ |
2537 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
d211621f |
2538 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
67779be7 |
2539 | if (*cfg.remote_cmd) { |
2540 | ssh2_pkt_addstring("exec"); |
2541 | ssh2_pkt_addbool(1); /* want reply */ |
2542 | ssh2_pkt_addstring(cfg.remote_cmd); |
2543 | } else { |
2544 | ssh2_pkt_addstring("shell"); |
2545 | ssh2_pkt_addbool(1); /* want reply */ |
2546 | } |
7cca0d81 |
2547 | ssh2_pkt_send(); |
d211621f |
2548 | do { |
7cca0d81 |
2549 | crWaitUntilV(ispkt); |
d211621f |
2550 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
2551 | /* FIXME: be able to handle other channels here */ |
2552 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2553 | continue; /* wrong channel */ |
2554 | mainchan->u.v2.remwindow += ssh2_pkt_getuint32(); |
2555 | } |
7cca0d81 |
2556 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2557 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
2558 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
2559 | bombout(("Server got confused by shell/command request")); |
2560 | crReturnV; |
7cca0d81 |
2561 | } |
8d5de777 |
2562 | bombout(("Server refused to start a shell/command")); |
2563 | crReturnV; |
7cca0d81 |
2564 | } else { |
8d5de777 |
2565 | logevent("Started a shell/command"); |
7cca0d81 |
2566 | } |
2567 | |
6e48c3fe |
2568 | ssh_state = SSH_STATE_SESSION; |
2569 | if (size_needed) |
2570 | ssh_size(); |
3687d221 |
2571 | if (eof_needed) |
2572 | ssh_special(TS_EOF); |
6e48c3fe |
2573 | |
7cca0d81 |
2574 | /* |
2575 | * Transfer data! |
2576 | */ |
8ccc75b0 |
2577 | ssh_send_ok = 1; |
6f34e365 |
2578 | begin_session(); |
7cca0d81 |
2579 | while (1) { |
d211621f |
2580 | static int try_send; |
e5574168 |
2581 | crReturnV; |
d211621f |
2582 | try_send = FALSE; |
7cca0d81 |
2583 | if (ispkt) { |
2584 | if (pktin.type == SSH2_MSG_CHANNEL_DATA || |
2585 | pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA) { |
2586 | char *data; |
2587 | int length; |
d211621f |
2588 | /* FIXME: be able to handle other channels here */ |
2589 | if (ssh2_pkt_getuint32() != mainchan->localid) |
7cca0d81 |
2590 | continue; /* wrong channel */ |
2591 | if (pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA && |
2592 | ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR) |
2593 | continue; /* extended but not stderr */ |
2594 | ssh2_pkt_getstring(&data, &length); |
d211621f |
2595 | if (data) { |
fe50e814 |
2596 | from_backend(pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA, |
2597 | data, length); |
d211621f |
2598 | /* |
2599 | * Enlarge the window again at the remote side, |
2600 | * just in case it ever runs down and they fail |
2601 | * to send us any more data. |
2602 | */ |
2603 | ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2604 | ssh2_pkt_adduint32(mainchan->remoteid); |
2605 | ssh2_pkt_adduint32(length); |
2606 | ssh2_pkt_send(); |
2607 | } |
7cca0d81 |
2608 | } else if (pktin.type == SSH2_MSG_DISCONNECT) { |
2609 | ssh_state = SSH_STATE_CLOSED; |
d211621f |
2610 | logevent("Received disconnect message"); |
3257deae |
2611 | crReturnV; |
7cca0d81 |
2612 | } else if (pktin.type == SSH2_MSG_CHANNEL_REQUEST) { |
2613 | continue; /* exit status et al; ignore (FIXME?) */ |
d211621f |
2614 | } else if (pktin.type == SSH2_MSG_CHANNEL_EOF) { |
2615 | continue; /* remote sends EOF; ignore */ |
2616 | } else if (pktin.type == SSH2_MSG_CHANNEL_CLOSE) { |
2617 | /* FIXME: be able to handle other channels here */ |
2618 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2619 | continue; /* wrong channel */ |
2620 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
2621 | ssh2_pkt_adduint32(mainchan->remoteid); |
2622 | ssh2_pkt_send(); |
2623 | /* FIXME: mark the channel as closed */ |
2624 | if (1 /* FIXME: "all channels are closed" */) { |
2625 | logevent("All channels closed. Disconnecting"); |
2626 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
9005f3ba |
2627 | ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION); |
2628 | ssh2_pkt_addstring("All open channels closed"); |
2629 | ssh2_pkt_addstring("en"); /* language tag */ |
d211621f |
2630 | ssh2_pkt_send(); |
cf6e59d6 |
2631 | ssh_state = SSH_STATE_CLOSED; |
3257deae |
2632 | crReturnV; |
d211621f |
2633 | } |
2634 | continue; /* remote sends close; ignore (FIXME) */ |
7cca0d81 |
2635 | } else if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
d211621f |
2636 | /* FIXME: be able to handle other channels here */ |
2637 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2638 | continue; /* wrong channel */ |
2639 | mainchan->u.v2.remwindow += ssh2_pkt_getuint32(); |
2640 | try_send = TRUE; |
7cca0d81 |
2641 | } else { |
8d5de777 |
2642 | bombout(("Strange packet received: type %d", pktin.type)); |
2643 | crReturnV; |
7cca0d81 |
2644 | } |
2645 | } else { |
d211621f |
2646 | /* |
2647 | * We have spare data. Add it to the channel buffer. |
2648 | */ |
2649 | if (mainchan->u.v2.outbufsize < |
2650 | mainchan->u.v2.outbuflen + inlen) { |
2651 | mainchan->u.v2.outbufsize = |
2652 | mainchan->u.v2.outbuflen + inlen + 1024; |
2653 | mainchan->u.v2.outbuffer = srealloc(mainchan->u.v2.outbuffer, |
2654 | mainchan->u.v2.outbufsize); |
2655 | } |
2656 | memcpy(mainchan->u.v2.outbuffer + mainchan->u.v2.outbuflen, |
2657 | in, inlen); |
2658 | mainchan->u.v2.outbuflen += inlen; |
2659 | try_send = TRUE; |
7cca0d81 |
2660 | } |
d211621f |
2661 | if (try_send) { |
2662 | /* |
2663 | * Try to send data on the channel if we can. (FIXME: |
2664 | * on _all_ channels.) |
2665 | */ |
2666 | while (mainchan->u.v2.remwindow > 0 && |
2667 | mainchan->u.v2.outbuflen > 0) { |
2668 | unsigned len = mainchan->u.v2.remwindow; |
2669 | if (len > mainchan->u.v2.outbuflen) |
2670 | len = mainchan->u.v2.outbuflen; |
2671 | if (len > mainchan->u.v2.remmaxpkt) |
2672 | len = mainchan->u.v2.remmaxpkt; |
2673 | ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA); |
2674 | ssh2_pkt_adduint32(mainchan->remoteid); |
2675 | ssh2_pkt_addstring_start(); |
2676 | ssh2_pkt_addstring_data(mainchan->u.v2.outbuffer, len); |
2677 | ssh2_pkt_send(); |
2678 | mainchan->u.v2.outbuflen -= len; |
2679 | memmove(mainchan->u.v2.outbuffer, mainchan->u.v2.outbuffer+len, |
2680 | mainchan->u.v2.outbuflen); |
2681 | mainchan->u.v2.remwindow -= len; |
2682 | } |
2683 | } |
e5574168 |
2684 | } |
2685 | |
2686 | crFinishV; |
2687 | } |
2688 | |
2689 | /* |
7cca0d81 |
2690 | * Handle the top-level SSH2 protocol. |
2691 | */ |
2692 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt) |
2693 | { |
2694 | if (do_ssh2_transport(in, inlen, ispkt) == 0) |
2695 | return; |
2696 | do_ssh2_authconn(in, inlen, ispkt); |
2697 | } |
2698 | |
2699 | /* |
8df7a775 |
2700 | * Called to set up the connection. |
374330e2 |
2701 | * |
2702 | * Returns an error message, or NULL on success. |
374330e2 |
2703 | */ |
8df7a775 |
2704 | static char *ssh_init (char *host, int port, char **realhost) { |
fb09bf1c |
2705 | char *p; |
8f203108 |
2706 | |
2707 | #ifdef MSCRYPTOAPI |
2708 | if(crypto_startup() == 0) |
2709 | return "Microsoft high encryption pack not installed!"; |
2710 | #endif |
374330e2 |
2711 | |
8df7a775 |
2712 | ssh_send_ok = 0; |
2713 | |
fb09bf1c |
2714 | p = connect_to_host(host, port, realhost); |
2715 | if (p != NULL) |
2716 | return p; |
374330e2 |
2717 | |
374330e2 |
2718 | return NULL; |
2719 | } |
2720 | |
2721 | /* |
374330e2 |
2722 | * Called to send data down the Telnet connection. |
2723 | */ |
2724 | static void ssh_send (char *buf, int len) { |
f78051a1 |
2725 | if (s == NULL || ssh_protocol == NULL) |
374330e2 |
2726 | return; |
2727 | |
2728 | ssh_protocol(buf, len, 0); |
2729 | } |
2730 | |
2731 | /* |
6e48c3fe |
2732 | * Called to set the size of the window from SSH's POV. |
374330e2 |
2733 | */ |
2734 | static void ssh_size(void) { |
2735 | switch (ssh_state) { |
2736 | case SSH_STATE_BEFORE_SIZE: |
3687d221 |
2737 | case SSH_STATE_PREPACKET: |
21248260 |
2738 | case SSH_STATE_CLOSED: |
374330e2 |
2739 | break; /* do nothing */ |
2740 | case SSH_STATE_INTERMED: |
2741 | size_needed = TRUE; /* buffer for later */ |
2742 | break; |
2743 | case SSH_STATE_SESSION: |
fef97f43 |
2744 | if (!cfg.nopty) { |
6e48c3fe |
2745 | if (ssh_version == 1) { |
2746 | send_packet(SSH1_CMSG_WINDOW_SIZE, |
2747 | PKT_INT, rows, PKT_INT, cols, |
2748 | PKT_INT, 0, PKT_INT, 0, PKT_END); |
2749 | } else { |
2750 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
2751 | ssh2_pkt_adduint32(mainchan->remoteid); |
2752 | ssh2_pkt_addstring("window-change"); |
2753 | ssh2_pkt_addbool(0); |
2754 | ssh2_pkt_adduint32(cols); |
2755 | ssh2_pkt_adduint32(rows); |
2756 | ssh2_pkt_adduint32(0); |
2757 | ssh2_pkt_adduint32(0); |
2758 | ssh2_pkt_send(); |
2759 | } |
fef97f43 |
2760 | } |
3687d221 |
2761 | break; |
374330e2 |
2762 | } |
2763 | } |
2764 | |
2765 | /* |
6abbf9e3 |
2766 | * Send Telnet special codes. TS_EOF is useful for `plink', so you |
2767 | * can send an EOF and collect resulting output (e.g. `plink |
2768 | * hostname sort'). |
374330e2 |
2769 | */ |
2770 | static void ssh_special (Telnet_Special code) { |
6abbf9e3 |
2771 | if (code == TS_EOF) { |
3687d221 |
2772 | if (ssh_state != SSH_STATE_SESSION) { |
2773 | /* |
2774 | * Buffer the EOF in case we are pre-SESSION, so we can |
2775 | * send it as soon as we reach SESSION. |
2776 | */ |
2777 | if (code == TS_EOF) |
2778 | eof_needed = TRUE; |
2779 | return; |
2780 | } |
67779be7 |
2781 | if (ssh_version == 1) { |
6abbf9e3 |
2782 | send_packet(SSH1_CMSG_EOF, PKT_END); |
2783 | } else { |
2784 | ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF); |
d211621f |
2785 | ssh2_pkt_adduint32(mainchan->remoteid); |
6abbf9e3 |
2786 | ssh2_pkt_send(); |
2787 | } |
67779be7 |
2788 | logevent("Sent EOF message"); |
ec55b220 |
2789 | } else if (code == TS_PING) { |
3687d221 |
2790 | if (ssh_state == SSH_STATE_CLOSED || ssh_state == SSH_STATE_PREPACKET) |
2791 | return; |
ec55b220 |
2792 | if (ssh_version == 1) { |
2793 | send_packet(SSH1_MSG_IGNORE, PKT_STR, "", PKT_END); |
2794 | } else { |
2795 | ssh2_pkt_init(SSH2_MSG_IGNORE); |
2796 | ssh2_pkt_addstring_start(); |
2797 | ssh2_pkt_send(); |
2798 | } |
6abbf9e3 |
2799 | } else { |
2800 | /* do nothing */ |
2801 | } |
374330e2 |
2802 | } |
2803 | |
8df7a775 |
2804 | static Socket ssh_socket(void) { return s; } |
8ccc75b0 |
2805 | |
2806 | static int ssh_sendok(void) { return ssh_send_ok; } |
fb09bf1c |
2807 | |
374330e2 |
2808 | Backend ssh_backend = { |
2809 | ssh_init, |
374330e2 |
2810 | ssh_send, |
2811 | ssh_size, |
4017be6d |
2812 | ssh_special, |
8ccc75b0 |
2813 | ssh_socket, |
97db3be4 |
2814 | ssh_sendok, |
2815 | 22 |
374330e2 |
2816 | }; |