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1 | #include <stdio.h> |
2 | #include <stdlib.h> |
fb09bf1c |
3 | #include <stdarg.h> |
4 | #include <assert.h> |
374330e2 |
5 | #include <winsock.h> |
6 | |
7 | #include "putty.h" |
dacbd0e8 |
8 | #include "tree234.h" |
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9 | #include "ssh.h" |
10 | #include "scp.h" |
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11 | |
12 | #ifndef FALSE |
13 | #define FALSE 0 |
14 | #endif |
15 | #ifndef TRUE |
16 | #define TRUE 1 |
17 | #endif |
18 | |
fb09bf1c |
19 | #define logevent(s) { logevent(s); \ |
67779be7 |
20 | if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \ |
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21 | fprintf(stderr, "%s\n", s); } |
22 | |
8d5de777 |
23 | #define bombout(msg) ( ssh_state == SSH_STATE_CLOSED, closesocket(s), \ |
24 | s = INVALID_SOCKET, connection_fatal msg ) |
25 | |
d211621f |
26 | #define SSH1_MSG_DISCONNECT 1 /* 0x1 */ |
27 | #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */ |
28 | #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */ |
29 | #define SSH1_CMSG_USER 4 /* 0x4 */ |
30 | #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */ |
31 | #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */ |
32 | #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */ |
33 | #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */ |
34 | #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */ |
35 | #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */ |
36 | #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */ |
37 | #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */ |
38 | #define SSH1_SMSG_SUCCESS 14 /* 0xe */ |
39 | #define SSH1_SMSG_FAILURE 15 /* 0xf */ |
40 | #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */ |
41 | #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */ |
42 | #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */ |
43 | #define SSH1_CMSG_EOF 19 /* 0x13 */ |
44 | #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */ |
45 | #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */ |
46 | #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */ |
47 | #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */ |
48 | #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */ |
49 | #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */ |
50 | #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */ |
51 | #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */ |
52 | #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */ |
53 | #define SSH1_MSG_IGNORE 32 /* 0x20 */ |
54 | #define SSH1_MSG_DEBUG 36 /* 0x24 */ |
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 | |
105 | #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */ |
106 | #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */ |
107 | #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */ |
108 | #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */ |
109 | |
110 | #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */ |
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111 | |
112 | #define GET_32BIT(cp) \ |
113 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
114 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
115 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
116 | ((unsigned long)(unsigned char)(cp)[3])) |
117 | |
118 | #define PUT_32BIT(cp, value) { \ |
119 | (cp)[0] = (unsigned char)((value) >> 24); \ |
120 | (cp)[1] = (unsigned char)((value) >> 16); \ |
121 | (cp)[2] = (unsigned char)((value) >> 8); \ |
122 | (cp)[3] = (unsigned char)(value); } |
123 | |
7cca0d81 |
124 | enum { PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR, PKT_BIGNUM }; |
972a41c8 |
125 | |
374330e2 |
126 | /* Coroutine mechanics for the sillier bits of the code */ |
127 | #define crBegin1 static int crLine = 0; |
128 | #define crBegin2 switch(crLine) { case 0:; |
129 | #define crBegin crBegin1; crBegin2; |
130 | #define crFinish(z) } crLine = 0; return (z) |
131 | #define crFinishV } crLine = 0; return |
132 | #define crReturn(z) \ |
133 | do {\ |
134 | crLine=__LINE__; return (z); case __LINE__:;\ |
135 | } while (0) |
136 | #define crReturnV \ |
137 | do {\ |
138 | crLine=__LINE__; return; case __LINE__:;\ |
139 | } while (0) |
140 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
141 | #define crStopV do{ crLine = 0; return; }while(0) |
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142 | #define crWaitUntil(c) do { crReturn(0); } while (!(c)) |
7cca0d81 |
143 | #define crWaitUntilV(c) do { crReturnV; } while (!(c)) |
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144 | |
e5574168 |
145 | extern struct ssh_cipher ssh_3des; |
033b4cef |
146 | extern struct ssh_cipher ssh_3des_ssh2; |
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147 | extern struct ssh_cipher ssh_des; |
5e8358ad |
148 | extern struct ssh_cipher ssh_blowfish_ssh1; |
149 | extern struct ssh_cipher ssh_blowfish_ssh2; |
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150 | |
5e8358ad |
151 | /* |
152 | * Ciphers for SSH2. We miss out single-DES because it isn't |
153 | * supported; also 3DES and Blowfish are both done differently from |
154 | * SSH1. (3DES uses outer chaining; Blowfish has the opposite |
155 | * endianness and different-sized keys.) |
156 | * |
157 | * The first entry in this array is set up to be whatever the user |
158 | * asks for as a cipher. Thereafter there is a fixed preference |
159 | * order of fallback ciphers. |
160 | */ |
161 | struct ssh_cipher *ciphers[] = { NULL, &ssh_blowfish_ssh2, &ssh_3des_ssh2 }; |
e5574168 |
162 | |
163 | extern struct ssh_kex ssh_diffiehellman; |
164 | struct ssh_kex *kex_algs[] = { &ssh_diffiehellman }; |
165 | |
166 | extern struct ssh_hostkey ssh_dss; |
167 | struct ssh_hostkey *hostkey_algs[] = { &ssh_dss }; |
168 | |
169 | extern struct ssh_mac ssh_sha1; |
170 | |
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171 | static SHA_State exhash; |
e5574168 |
172 | |
d39f364a |
173 | static void nullmac_key(unsigned char *key) { } |
e5574168 |
174 | static void nullmac_generate(unsigned char *blk, int len, unsigned long seq) { } |
175 | static int nullmac_verify(unsigned char *blk, int len, unsigned long seq) { return 1; } |
176 | struct ssh_mac ssh_mac_none = { |
d39f364a |
177 | nullmac_key, nullmac_key, nullmac_generate, nullmac_verify, "none", 0 |
e5574168 |
178 | }; |
179 | struct ssh_mac *macs[] = { &ssh_sha1, &ssh_mac_none }; |
180 | |
181 | struct ssh_compress ssh_comp_none = { |
182 | "none" |
183 | }; |
184 | struct ssh_compress *compressions[] = { &ssh_comp_none }; |
185 | |
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186 | static SOCKET s = INVALID_SOCKET; |
187 | |
188 | static unsigned char session_key[32]; |
189 | static struct ssh_cipher *cipher = NULL; |
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190 | static struct ssh_cipher *cscipher = NULL; |
191 | static struct ssh_cipher *sccipher = NULL; |
192 | static struct ssh_mac *csmac = NULL; |
193 | static struct ssh_mac *scmac = NULL; |
194 | static struct ssh_compress *cscomp = NULL; |
195 | static struct ssh_compress *sccomp = NULL; |
196 | static struct ssh_kex *kex = NULL; |
197 | static struct ssh_hostkey *hostkey = NULL; |
85ee8208 |
198 | int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = NULL; |
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199 | |
200 | static char *savedhost; |
8ccc75b0 |
201 | static int ssh_send_ok; |
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202 | |
dacbd0e8 |
203 | /* |
204 | * 2-3-4 tree storing channels. |
205 | */ |
206 | struct ssh_channel { |
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207 | unsigned remoteid, localid; |
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208 | int type; |
209 | int closes; |
210 | union { |
211 | struct ssh_agent_channel { |
212 | unsigned char *message; |
213 | unsigned char msglen[4]; |
214 | int lensofar, totallen; |
215 | } a; |
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216 | struct ssh2_data_channel { |
217 | unsigned char *outbuffer; |
218 | unsigned outbuflen, outbufsize; |
219 | unsigned remwindow, remmaxpkt; |
220 | } v2; |
dacbd0e8 |
221 | } u; |
222 | }; |
223 | static tree234 *ssh_channels; /* indexed by local id */ |
224 | static int ssh_channelcmp(void *av, void *bv) { |
225 | struct ssh_channel *a = (struct ssh_channel *)av; |
226 | struct ssh_channel *b = (struct ssh_channel *)bv; |
227 | if (a->localid < b->localid) return -1; |
228 | if (a->localid > b->localid) return +1; |
229 | return 0; |
230 | } |
231 | static int ssh_channelfind(void *av, void *bv) { |
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232 | unsigned *a = (unsigned *)av; |
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233 | struct ssh_channel *b = (struct ssh_channel *)bv; |
234 | if (*a < b->localid) return -1; |
235 | if (*a > b->localid) return +1; |
236 | return 0; |
237 | } |
238 | |
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239 | static struct ssh_channel *mainchan; /* primary session channel */ |
240 | |
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241 | static enum { |
242 | SSH_STATE_BEFORE_SIZE, |
243 | SSH_STATE_INTERMED, |
21248260 |
244 | SSH_STATE_SESSION, |
245 | SSH_STATE_CLOSED |
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246 | } ssh_state = SSH_STATE_BEFORE_SIZE; |
247 | |
248 | static int size_needed = FALSE; |
249 | |
250 | static void s_write (char *buf, int len) { |
251 | while (len > 0) { |
252 | int i = send (s, buf, len, 0); |
4017be6d |
253 | noise_ultralight(i); |
8d5de777 |
254 | if (i <= 0) { |
255 | bombout(("Lost connection while sending")); |
256 | return; |
257 | } |
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258 | if (i > 0) |
259 | len -= i, buf += i; |
260 | } |
261 | } |
262 | |
263 | static int s_read (char *buf, int len) { |
264 | int ret = 0; |
265 | while (len > 0) { |
266 | int i = recv (s, buf, len, 0); |
4017be6d |
267 | noise_ultralight(i); |
374330e2 |
268 | if (i > 0) |
269 | len -= i, buf += i, ret += i; |
270 | else |
271 | return i; |
272 | } |
273 | return ret; |
274 | } |
275 | |
276 | static void c_write (char *buf, int len) { |
67779be7 |
277 | if ((flags & FLAG_STDERR)) { |
4017be6d |
278 | int i; |
279 | for (i = 0; i < len; i++) |
280 | if (buf[i] != '\r') |
281 | fputc(buf[i], stderr); |
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282 | return; |
283 | } |
c9def1b8 |
284 | while (len--) |
285 | c_write1(*buf++); |
374330e2 |
286 | } |
287 | |
288 | struct Packet { |
289 | long length; |
290 | int type; |
374330e2 |
291 | unsigned char *data; |
292 | unsigned char *body; |
e5574168 |
293 | long savedpos; |
374330e2 |
294 | long maxlen; |
295 | }; |
296 | |
fb09bf1c |
297 | static struct Packet pktin = { 0, 0, NULL, NULL, 0 }; |
298 | static struct Packet pktout = { 0, 0, NULL, NULL, 0 }; |
374330e2 |
299 | |
6abbf9e3 |
300 | static int ssh_version; |
e5574168 |
301 | static void (*ssh_protocol)(unsigned char *in, int inlen, int ispkt); |
302 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt); |
303 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt); |
374330e2 |
304 | static void ssh_size(void); |
305 | |
e5574168 |
306 | static int (*s_rdpkt)(unsigned char **data, int *datalen); |
fb09bf1c |
307 | |
308 | /* |
309 | * Collect incoming data in the incoming packet buffer. |
e5574168 |
310 | * Decipher and verify the packet when it is completely read. |
311 | * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets. |
fb09bf1c |
312 | * Update the *data and *datalen variables. |
313 | * Return the additional nr of bytes needed, or 0 when |
314 | * a complete packet is available. |
315 | */ |
e5574168 |
316 | static int ssh1_rdpkt(unsigned char **data, int *datalen) |
fb09bf1c |
317 | { |
318 | static long len, pad, biglen, to_read; |
572f871e |
319 | static unsigned long realcrc, gotcrc; |
fb09bf1c |
320 | static unsigned char *p; |
321 | static int i; |
374330e2 |
322 | |
323 | crBegin; |
374330e2 |
324 | |
fb09bf1c |
325 | next_packet: |
37508af4 |
326 | |
fb09bf1c |
327 | pktin.type = 0; |
328 | pktin.length = 0; |
374330e2 |
329 | |
fb09bf1c |
330 | for (i = len = 0; i < 4; i++) { |
331 | while ((*datalen) == 0) |
332 | crReturn(4-i); |
333 | len = (len << 8) + **data; |
334 | (*data)++, (*datalen)--; |
335 | } |
374330e2 |
336 | |
fb09bf1c |
337 | #ifdef FWHACK |
338 | if (len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
339 | len = 0x300; /* big enough to carry to end */ |
340 | } |
341 | #endif |
374330e2 |
342 | |
fb09bf1c |
343 | pad = 8 - (len % 8); |
344 | biglen = len + pad; |
345 | pktin.length = len - 5; |
346 | |
347 | if (pktin.maxlen < biglen) { |
348 | pktin.maxlen = biglen; |
e5574168 |
349 | pktin.data = (pktin.data == NULL ? malloc(biglen+APIEXTRA) : |
350 | realloc(pktin.data, biglen+APIEXTRA)); |
fb09bf1c |
351 | if (!pktin.data) |
352 | fatalbox("Out of memory"); |
353 | } |
374330e2 |
354 | |
fb09bf1c |
355 | to_read = biglen; |
356 | p = pktin.data; |
357 | while (to_read > 0) { |
358 | static int chunk; |
359 | chunk = to_read; |
360 | while ((*datalen) == 0) |
361 | crReturn(to_read); |
362 | if (chunk > (*datalen)) |
363 | chunk = (*datalen); |
364 | memcpy(p, *data, chunk); |
365 | *data += chunk; |
366 | *datalen -= chunk; |
367 | p += chunk; |
368 | to_read -= chunk; |
369 | } |
374330e2 |
370 | |
fb09bf1c |
371 | if (cipher) |
372 | cipher->decrypt(pktin.data, biglen); |
374330e2 |
373 | |
fb09bf1c |
374 | pktin.type = pktin.data[pad]; |
375 | pktin.body = pktin.data + pad + 1; |
374330e2 |
376 | |
fb09bf1c |
377 | realcrc = crc32(pktin.data, biglen-4); |
378 | gotcrc = GET_32BIT(pktin.data+biglen-4); |
379 | if (gotcrc != realcrc) { |
8d5de777 |
380 | bombout(("Incorrect CRC received on packet")); |
381 | crReturn(0); |
fb09bf1c |
382 | } |
572f871e |
383 | |
e5574168 |
384 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
385 | pktin.type == SSH1_SMSG_STDERR_DATA || |
386 | pktin.type == SSH1_MSG_DEBUG || |
18515c51 |
387 | pktin.type == SSH1_SMSG_AUTH_TIS_CHALLENGE || |
388 | pktin.type == SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
fb09bf1c |
389 | long strlen = GET_32BIT(pktin.body); |
8d5de777 |
390 | if (strlen + 4 != pktin.length) { |
391 | bombout(("Received data packet with bogus string length")); |
392 | crReturn(0); |
393 | } |
fb09bf1c |
394 | } |
395 | |
e5574168 |
396 | if (pktin.type == SSH1_MSG_DEBUG) { |
fb09bf1c |
397 | /* log debug message */ |
398 | char buf[80]; |
399 | int strlen = GET_32BIT(pktin.body); |
400 | strcpy(buf, "Remote: "); |
401 | if (strlen > 70) strlen = 70; |
402 | memcpy(buf+8, pktin.body+4, strlen); |
403 | buf[8+strlen] = '\0'; |
404 | logevent(buf); |
405 | goto next_packet; |
e5574168 |
406 | } else if (pktin.type == SSH1_MSG_IGNORE) { |
fb09bf1c |
407 | /* do nothing */ |
408 | goto next_packet; |
409 | } |
410 | |
411 | crFinish(0); |
412 | } |
413 | |
e5574168 |
414 | static int ssh2_rdpkt(unsigned char **data, int *datalen) |
415 | { |
416 | static long len, pad, payload, packetlen, maclen; |
417 | static int i; |
418 | static int cipherblk; |
419 | static unsigned long incoming_sequence = 0; |
420 | |
421 | crBegin; |
422 | |
423 | next_packet: |
424 | |
425 | pktin.type = 0; |
426 | pktin.length = 0; |
427 | |
428 | if (cipher) |
429 | cipherblk = cipher->blksize; |
430 | else |
431 | cipherblk = 8; |
432 | if (cipherblk < 8) |
433 | cipherblk = 8; |
434 | |
435 | if (pktin.maxlen < cipherblk) { |
436 | pktin.maxlen = cipherblk; |
437 | pktin.data = (pktin.data == NULL ? malloc(cipherblk+APIEXTRA) : |
438 | realloc(pktin.data, cipherblk+APIEXTRA)); |
439 | if (!pktin.data) |
440 | fatalbox("Out of memory"); |
441 | } |
442 | |
443 | /* |
444 | * Acquire and decrypt the first block of the packet. This will |
445 | * contain the length and padding details. |
446 | */ |
447 | for (i = len = 0; i < cipherblk; i++) { |
448 | while ((*datalen) == 0) |
449 | crReturn(cipherblk-i); |
450 | pktin.data[i] = *(*data)++; |
451 | (*datalen)--; |
452 | } |
453 | #ifdef FWHACK |
454 | if (!memcmp(pktin.data, "Remo", 4)) {/* "Remo"te server has closed ... */ |
455 | /* FIXME */ |
456 | } |
457 | #endif |
458 | if (sccipher) |
459 | sccipher->decrypt(pktin.data, cipherblk); |
460 | |
461 | /* |
462 | * Now get the length and padding figures. |
463 | */ |
464 | len = GET_32BIT(pktin.data); |
465 | pad = pktin.data[4]; |
466 | |
467 | /* |
468 | * This enables us to deduce the payload length. |
469 | */ |
470 | payload = len - pad - 1; |
471 | |
472 | pktin.length = payload + 5; |
473 | |
474 | /* |
475 | * So now we can work out the total packet length. |
476 | */ |
477 | packetlen = len + 4; |
478 | maclen = scmac ? scmac->len : 0; |
479 | |
480 | /* |
481 | * Adjust memory allocation if packet is too big. |
482 | */ |
59dcd2a8 |
483 | if (pktin.maxlen < packetlen+maclen) { |
484 | pktin.maxlen = packetlen+maclen; |
485 | pktin.data = (pktin.data == NULL ? malloc(pktin.maxlen+APIEXTRA) : |
486 | realloc(pktin.data, pktin.maxlen+APIEXTRA)); |
e5574168 |
487 | if (!pktin.data) |
488 | fatalbox("Out of memory"); |
489 | } |
490 | |
491 | /* |
492 | * Read and decrypt the remainder of the packet. |
493 | */ |
494 | for (i = cipherblk; i < packetlen + maclen; i++) { |
495 | while ((*datalen) == 0) |
496 | crReturn(packetlen + maclen - i); |
497 | pktin.data[i] = *(*data)++; |
498 | (*datalen)--; |
499 | } |
500 | /* Decrypt everything _except_ the MAC. */ |
501 | if (sccipher) |
502 | sccipher->decrypt(pktin.data + cipherblk, packetlen - cipherblk); |
503 | |
7cca0d81 |
504 | #if 0 |
d39f364a |
505 | debug(("Got packet len=%d pad=%d\r\n", len, pad)); |
506 | for (i = 0; i < packetlen; i++) |
507 | debug((" %02x", (unsigned char)pktin.data[i])); |
508 | debug(("\r\n")); |
7cca0d81 |
509 | #endif |
d39f364a |
510 | |
e5574168 |
511 | /* |
512 | * Check the MAC. |
513 | */ |
8d5de777 |
514 | if (scmac && !scmac->verify(pktin.data, len+4, incoming_sequence)) { |
515 | bombout(("Incorrect MAC received on packet")); |
516 | crReturn(0); |
517 | } |
033b4cef |
518 | incoming_sequence++; /* whether or not we MACed */ |
e5574168 |
519 | |
520 | pktin.savedpos = 6; |
521 | pktin.type = pktin.data[5]; |
e5574168 |
522 | |
7cca0d81 |
523 | if (pktin.type == SSH2_MSG_IGNORE || pktin.type == SSH2_MSG_DEBUG) |
524 | goto next_packet; /* FIXME: print DEBUG message */ |
e5574168 |
525 | |
526 | crFinish(0); |
527 | } |
528 | |
fb09bf1c |
529 | static void ssh_gotdata(unsigned char *data, int datalen) |
530 | { |
531 | while (datalen > 0) { |
85ee8208 |
532 | if ( s_rdpkt(&data, &datalen) == 0 ) { |
374330e2 |
533 | ssh_protocol(NULL, 0, 1); |
85ee8208 |
534 | if (ssh_state == SSH_STATE_CLOSED) { |
535 | return; |
536 | } |
537 | } |
374330e2 |
538 | } |
374330e2 |
539 | } |
540 | |
fb09bf1c |
541 | |
374330e2 |
542 | static void s_wrpkt_start(int type, int len) { |
543 | int pad, biglen; |
544 | |
545 | len += 5; /* type and CRC */ |
546 | pad = 8 - (len%8); |
547 | biglen = len + pad; |
548 | |
549 | pktout.length = len-5; |
550 | if (pktout.maxlen < biglen) { |
551 | pktout.maxlen = biglen; |
8f203108 |
552 | #ifdef MSCRYPTOAPI |
fb09bf1c |
553 | /* Allocate enough buffer space for extra block |
8f203108 |
554 | * for MS CryptEncrypt() */ |
fb09bf1c |
555 | pktout.data = (pktout.data == NULL ? malloc(biglen+12) : |
556 | realloc(pktout.data, biglen+12)); |
8f203108 |
557 | #else |
c1f5f956 |
558 | pktout.data = (pktout.data == NULL ? malloc(biglen+4) : |
559 | realloc(pktout.data, biglen+4)); |
8f203108 |
560 | #endif |
374330e2 |
561 | if (!pktout.data) |
562 | fatalbox("Out of memory"); |
563 | } |
564 | |
565 | pktout.type = type; |
566 | pktout.body = pktout.data+4+pad+1; |
567 | } |
568 | |
569 | static void s_wrpkt(void) { |
570 | int pad, len, biglen, i; |
571 | unsigned long crc; |
572 | |
573 | len = pktout.length + 5; /* type and CRC */ |
574 | pad = 8 - (len%8); |
575 | biglen = len + pad; |
576 | |
577 | pktout.body[-1] = pktout.type; |
578 | for (i=0; i<pad; i++) |
579 | pktout.data[i+4] = random_byte(); |
580 | crc = crc32(pktout.data+4, biglen-4); |
fb09bf1c |
581 | PUT_32BIT(pktout.data+biglen, crc); |
582 | PUT_32BIT(pktout.data, len); |
374330e2 |
583 | |
584 | if (cipher) |
585 | cipher->encrypt(pktout.data+4, biglen); |
586 | |
587 | s_write(pktout.data, biglen+4); |
588 | } |
589 | |
fb09bf1c |
590 | /* |
591 | * Construct a packet with the specified contents and |
592 | * send it to the server. |
593 | */ |
594 | static void send_packet(int pkttype, ...) |
595 | { |
596 | va_list args; |
597 | unsigned char *p, *argp, argchar; |
598 | unsigned long argint; |
599 | int pktlen, argtype, arglen; |
7cca0d81 |
600 | Bignum bn; |
fb09bf1c |
601 | |
602 | pktlen = 0; |
603 | va_start(args, pkttype); |
604 | while ((argtype = va_arg(args, int)) != PKT_END) { |
605 | switch (argtype) { |
606 | case PKT_INT: |
607 | (void) va_arg(args, int); |
608 | pktlen += 4; |
609 | break; |
610 | case PKT_CHAR: |
611 | (void) va_arg(args, char); |
612 | pktlen++; |
613 | break; |
614 | case PKT_DATA: |
615 | (void) va_arg(args, unsigned char *); |
616 | arglen = va_arg(args, int); |
617 | pktlen += arglen; |
618 | break; |
619 | case PKT_STR: |
620 | argp = va_arg(args, unsigned char *); |
621 | arglen = strlen(argp); |
622 | pktlen += 4 + arglen; |
623 | break; |
7cca0d81 |
624 | case PKT_BIGNUM: |
625 | bn = va_arg(args, Bignum); |
5c58ad2d |
626 | pktlen += ssh1_bignum_length(bn); |
7cca0d81 |
627 | break; |
fb09bf1c |
628 | default: |
629 | assert(0); |
630 | } |
631 | } |
632 | va_end(args); |
633 | |
634 | s_wrpkt_start(pkttype, pktlen); |
635 | p = pktout.body; |
636 | |
637 | va_start(args, pkttype); |
638 | while ((argtype = va_arg(args, int)) != PKT_END) { |
639 | switch (argtype) { |
640 | case PKT_INT: |
641 | argint = va_arg(args, int); |
642 | PUT_32BIT(p, argint); |
643 | p += 4; |
644 | break; |
645 | case PKT_CHAR: |
646 | argchar = va_arg(args, unsigned char); |
647 | *p = argchar; |
648 | p++; |
649 | break; |
650 | case PKT_DATA: |
651 | argp = va_arg(args, unsigned char *); |
652 | arglen = va_arg(args, int); |
653 | memcpy(p, argp, arglen); |
654 | p += arglen; |
655 | break; |
656 | case PKT_STR: |
657 | argp = va_arg(args, unsigned char *); |
658 | arglen = strlen(argp); |
659 | PUT_32BIT(p, arglen); |
660 | memcpy(p + 4, argp, arglen); |
661 | p += 4 + arglen; |
662 | break; |
7cca0d81 |
663 | case PKT_BIGNUM: |
664 | bn = va_arg(args, Bignum); |
5c58ad2d |
665 | p += ssh1_write_bignum(p, bn); |
7cca0d81 |
666 | break; |
fb09bf1c |
667 | } |
668 | } |
669 | va_end(args); |
670 | |
671 | s_wrpkt(); |
672 | } |
673 | |
674 | |
675 | /* |
676 | * Connect to specified host and port. |
677 | * Returns an error message, or NULL on success. |
678 | * Also places the canonical host name into `realhost'. |
679 | */ |
680 | static char *connect_to_host(char *host, int port, char **realhost) |
681 | { |
682 | SOCKADDR_IN addr; |
683 | struct hostent *h; |
684 | unsigned long a; |
685 | #ifdef FWHACK |
686 | char *FWhost; |
687 | int FWport; |
688 | #endif |
689 | |
690 | savedhost = malloc(1+strlen(host)); |
691 | if (!savedhost) |
692 | fatalbox("Out of memory"); |
693 | strcpy(savedhost, host); |
694 | |
695 | if (port < 0) |
696 | port = 22; /* default ssh port */ |
697 | |
698 | #ifdef FWHACK |
699 | FWhost = host; |
700 | FWport = port; |
701 | host = FWSTR; |
702 | port = 23; |
703 | #endif |
704 | |
705 | /* |
706 | * Try to find host. |
707 | */ |
708 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
709 | if ( (h = gethostbyname(host)) == NULL) |
710 | switch (WSAGetLastError()) { |
711 | case WSAENETDOWN: return "Network is down"; |
712 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
713 | return "Host does not exist"; |
714 | case WSATRY_AGAIN: return "Host not found"; |
715 | default: return "gethostbyname: unknown error"; |
716 | } |
717 | memcpy (&a, h->h_addr, sizeof(a)); |
718 | *realhost = h->h_name; |
719 | } else |
720 | *realhost = host; |
721 | #ifdef FWHACK |
722 | *realhost = FWhost; |
723 | #endif |
724 | a = ntohl(a); |
725 | |
726 | /* |
727 | * Open socket. |
728 | */ |
729 | s = socket(AF_INET, SOCK_STREAM, 0); |
730 | if (s == INVALID_SOCKET) |
731 | switch (WSAGetLastError()) { |
732 | case WSAENETDOWN: return "Network is down"; |
733 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
734 | default: return "socket(): unknown error"; |
735 | } |
736 | |
737 | /* |
738 | * Bind to local address. |
739 | */ |
740 | addr.sin_family = AF_INET; |
741 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
742 | addr.sin_port = htons(0); |
743 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
744 | switch (WSAGetLastError()) { |
745 | case WSAENETDOWN: return "Network is down"; |
746 | default: return "bind(): unknown error"; |
747 | } |
748 | |
749 | /* |
750 | * Connect to remote address. |
751 | */ |
752 | addr.sin_addr.s_addr = htonl(a); |
753 | addr.sin_port = htons((short)port); |
754 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
755 | switch (WSAGetLastError()) { |
756 | case WSAENETDOWN: return "Network is down"; |
757 | case WSAECONNREFUSED: return "Connection refused"; |
758 | case WSAENETUNREACH: return "Network is unreachable"; |
759 | case WSAEHOSTUNREACH: return "No route to host"; |
760 | default: return "connect(): unknown error"; |
761 | } |
762 | |
763 | #ifdef FWHACK |
764 | send(s, "connect ", 8, 0); |
765 | send(s, FWhost, strlen(FWhost), 0); |
766 | { |
767 | char buf[20]; |
768 | sprintf(buf, " %d\n", FWport); |
769 | send (s, buf, strlen(buf), 0); |
770 | } |
771 | #endif |
772 | |
773 | return NULL; |
774 | } |
775 | |
9697bfd2 |
776 | static int ssh_versioncmp(char *a, char *b) { |
777 | char *ae, *be; |
778 | unsigned long av, bv; |
779 | |
43aa02a7 |
780 | av = strtoul(a, &ae, 10); |
781 | bv = strtoul(b, &be, 10); |
9697bfd2 |
782 | if (av != bv) return (av < bv ? -1 : +1); |
783 | if (*ae == '.') ae++; |
784 | if (*be == '.') be++; |
43aa02a7 |
785 | av = strtoul(ae, &ae, 10); |
786 | bv = strtoul(be, &be, 10); |
9697bfd2 |
787 | if (av != bv) return (av < bv ? -1 : +1); |
788 | return 0; |
789 | } |
790 | |
e5574168 |
791 | |
792 | /* |
793 | * Utility routine for putting an SSH-protocol `string' into a SHA |
794 | * state. |
795 | */ |
796 | #include <stdio.h> |
797 | void sha_string(SHA_State *s, void *str, int len) { |
798 | unsigned char lenblk[4]; |
e5574168 |
799 | PUT_32BIT(lenblk, len); |
e5574168 |
800 | SHA_Bytes(s, lenblk, 4); |
e5574168 |
801 | SHA_Bytes(s, str, len); |
802 | } |
803 | |
7cca0d81 |
804 | /* |
805 | * SSH2 packet construction functions. |
806 | */ |
807 | void ssh2_pkt_adddata(void *data, int len) { |
808 | pktout.length += len; |
809 | if (pktout.maxlen < pktout.length) { |
810 | pktout.maxlen = pktout.length + 256; |
811 | pktout.data = (pktout.data == NULL ? malloc(pktout.maxlen+APIEXTRA) : |
812 | realloc(pktout.data, pktout.maxlen+APIEXTRA)); |
813 | if (!pktout.data) |
814 | fatalbox("Out of memory"); |
815 | } |
816 | memcpy(pktout.data+pktout.length-len, data, len); |
817 | } |
818 | void ssh2_pkt_addbyte(unsigned char byte) { |
819 | ssh2_pkt_adddata(&byte, 1); |
820 | } |
821 | void ssh2_pkt_init(int pkt_type) { |
822 | pktout.length = 5; |
823 | ssh2_pkt_addbyte((unsigned char)pkt_type); |
824 | } |
825 | void ssh2_pkt_addbool(unsigned char value) { |
826 | ssh2_pkt_adddata(&value, 1); |
827 | } |
828 | void ssh2_pkt_adduint32(unsigned long value) { |
829 | unsigned char x[4]; |
830 | PUT_32BIT(x, value); |
831 | ssh2_pkt_adddata(x, 4); |
832 | } |
833 | void ssh2_pkt_addstring_start(void) { |
834 | ssh2_pkt_adduint32(0); |
835 | pktout.savedpos = pktout.length; |
836 | } |
837 | void ssh2_pkt_addstring_str(char *data) { |
838 | ssh2_pkt_adddata(data, strlen(data)); |
839 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
840 | pktout.length - pktout.savedpos); |
841 | } |
842 | void ssh2_pkt_addstring_data(char *data, int len) { |
843 | ssh2_pkt_adddata(data, len); |
844 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
845 | pktout.length - pktout.savedpos); |
846 | } |
847 | void ssh2_pkt_addstring(char *data) { |
848 | ssh2_pkt_addstring_start(); |
849 | ssh2_pkt_addstring_str(data); |
850 | } |
851 | char *ssh2_mpint_fmt(Bignum b, int *len) { |
852 | unsigned char *p; |
853 | int i, n = b[0]; |
854 | p = malloc(n * 2 + 1); |
855 | if (!p) |
856 | fatalbox("out of memory"); |
857 | p[0] = 0; |
858 | for (i = 0; i < n; i++) { |
859 | p[i*2+1] = (b[n-i] >> 8) & 0xFF; |
860 | p[i*2+2] = (b[n-i] ) & 0xFF; |
861 | } |
862 | i = 0; |
863 | while (p[i] == 0 && (p[i+1] & 0x80) == 0) |
864 | i++; |
865 | memmove(p, p+i, n*2+1-i); |
866 | *len = n*2+1-i; |
867 | return p; |
868 | } |
869 | void ssh2_pkt_addmp(Bignum b) { |
870 | unsigned char *p; |
871 | int len; |
872 | p = ssh2_mpint_fmt(b, &len); |
873 | ssh2_pkt_addstring_start(); |
874 | ssh2_pkt_addstring_data(p, len); |
875 | free(p); |
876 | } |
877 | void ssh2_pkt_send(void) { |
878 | int cipherblk, maclen, padding, i; |
879 | static unsigned long outgoing_sequence = 0; |
880 | |
881 | /* |
882 | * Add padding. At least four bytes, and must also bring total |
883 | * length (minus MAC) up to a multiple of the block size. |
884 | */ |
885 | cipherblk = cipher ? cipher->blksize : 8; /* block size */ |
886 | cipherblk = cipherblk < 8 ? 8 : cipherblk; /* or 8 if blksize < 8 */ |
887 | padding = 4; |
888 | padding += (cipherblk - (pktout.length + padding) % cipherblk) % cipherblk; |
889 | pktout.data[4] = padding; |
890 | for (i = 0; i < padding; i++) |
891 | pktout.data[pktout.length + i] = random_byte(); |
892 | PUT_32BIT(pktout.data, pktout.length + padding - 4); |
893 | if (csmac) |
894 | csmac->generate(pktout.data, pktout.length + padding, |
895 | outgoing_sequence); |
896 | outgoing_sequence++; /* whether or not we MACed */ |
897 | |
898 | #if 0 |
899 | debug(("Sending packet len=%d\r\n", pktout.length+padding)); |
900 | for (i = 0; i < pktout.length+padding; i++) |
901 | debug((" %02x", (unsigned char)pktout.data[i])); |
902 | debug(("\r\n")); |
903 | #endif |
904 | |
905 | if (cscipher) |
906 | cscipher->encrypt(pktout.data, pktout.length + padding); |
907 | maclen = csmac ? csmac->len : 0; |
908 | |
909 | s_write(pktout.data, pktout.length + padding + maclen); |
910 | } |
911 | |
912 | #if 0 |
913 | void bndebug(char *string, Bignum b) { |
914 | unsigned char *p; |
915 | int i, len; |
916 | p = ssh2_mpint_fmt(b, &len); |
917 | debug(("%s", string)); |
918 | for (i = 0; i < len; i++) |
919 | debug((" %02x", p[i])); |
920 | debug(("\r\n")); |
921 | free(p); |
922 | } |
923 | #endif |
924 | |
925 | void sha_mpint(SHA_State *s, Bignum b) { |
926 | unsigned char *p; |
927 | int len; |
928 | p = ssh2_mpint_fmt(b, &len); |
929 | sha_string(s, p, len); |
930 | free(p); |
931 | } |
932 | |
933 | /* |
934 | * SSH2 packet decode functions. |
935 | */ |
936 | unsigned long ssh2_pkt_getuint32(void) { |
937 | unsigned long value; |
938 | if (pktin.length - pktin.savedpos < 4) |
939 | return 0; /* arrgh, no way to decline (FIXME?) */ |
940 | value = GET_32BIT(pktin.data+pktin.savedpos); |
941 | pktin.savedpos += 4; |
942 | return value; |
943 | } |
944 | void ssh2_pkt_getstring(char **p, int *length) { |
945 | *p = NULL; |
946 | if (pktin.length - pktin.savedpos < 4) |
947 | return; |
948 | *length = GET_32BIT(pktin.data+pktin.savedpos); |
949 | pktin.savedpos += 4; |
950 | if (pktin.length - pktin.savedpos < *length) |
951 | return; |
952 | *p = pktin.data+pktin.savedpos; |
953 | pktin.savedpos += *length; |
954 | } |
955 | Bignum ssh2_pkt_getmp(void) { |
956 | char *p; |
957 | int i, j, length; |
958 | Bignum b; |
959 | |
960 | ssh2_pkt_getstring(&p, &length); |
961 | if (!p) |
962 | return NULL; |
8d5de777 |
963 | if (p[0] & 0x80) { |
964 | bombout(("internal error: Can't handle negative mpints")); |
965 | return NULL; |
966 | } |
7cca0d81 |
967 | b = newbn((length+1)/2); |
968 | for (i = 0; i < length; i++) { |
969 | j = length - 1 - i; |
970 | if (j & 1) |
971 | b[j/2+1] |= ((unsigned char)p[i]) << 8; |
972 | else |
973 | b[j/2+1] |= ((unsigned char)p[i]); |
974 | } |
975 | return b; |
976 | } |
977 | |
374330e2 |
978 | static int do_ssh_init(void) { |
c5e9c988 |
979 | char c, *vsp; |
374330e2 |
980 | char version[10]; |
c5e9c988 |
981 | char vstring[80]; |
982 | char vlog[sizeof(vstring)+20]; |
374330e2 |
983 | int i; |
984 | |
985 | #ifdef FWHACK |
986 | i = 0; |
987 | while (s_read(&c, 1) == 1) { |
988 | if (c == 'S' && i < 2) i++; |
989 | else if (c == 'S' && i == 2) i = 2; |
990 | else if (c == 'H' && i == 2) break; |
991 | else i = 0; |
992 | } |
993 | #else |
994 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
995 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
996 | if (s_read(&c,1) != 1 || c != 'H') return 0; |
997 | #endif |
c5e9c988 |
998 | strcpy(vstring, "SSH-"); |
999 | vsp = vstring+4; |
374330e2 |
1000 | if (s_read(&c,1) != 1 || c != '-') return 0; |
1001 | i = 0; |
1002 | while (1) { |
1003 | if (s_read(&c,1) != 1) |
1004 | return 0; |
c5e9c988 |
1005 | if (vsp < vstring+sizeof(vstring)-1) |
1006 | *vsp++ = c; |
374330e2 |
1007 | if (i >= 0) { |
1008 | if (c == '-') { |
1009 | version[i] = '\0'; |
1010 | i = -1; |
1011 | } else if (i < sizeof(version)-1) |
1012 | version[i++] = c; |
1013 | } |
1014 | else if (c == '\n') |
1015 | break; |
1016 | } |
1017 | |
c5e9c988 |
1018 | *vsp = 0; |
1019 | sprintf(vlog, "Server version: %s", vstring); |
1020 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1021 | logevent(vlog); |
1022 | |
adf799dd |
1023 | /* |
1024 | * Server version "1.99" means we can choose whether we use v1 |
1025 | * or v2 protocol. Choice is based on cfg.sshprot. |
1026 | */ |
1027 | if (ssh_versioncmp(version, cfg.sshprot == 1 ? "2.0" : "1.99") >= 0) { |
e5574168 |
1028 | /* |
1029 | * This is a v2 server. Begin v2 protocol. |
1030 | */ |
1031 | char *verstring = "SSH-2.0-PuTTY"; |
1032 | SHA_Init(&exhash); |
1033 | /* |
1034 | * Hash our version string and their version string. |
1035 | */ |
1036 | sha_string(&exhash, verstring, strlen(verstring)); |
1037 | sha_string(&exhash, vstring, strcspn(vstring, "\r\n")); |
1038 | sprintf(vstring, "%s\n", verstring); |
1039 | sprintf(vlog, "We claim version: %s", verstring); |
1040 | logevent(vlog); |
1041 | logevent("Using SSH protocol version 2"); |
1042 | s_write(vstring, strlen(vstring)); |
1043 | ssh_protocol = ssh2_protocol; |
6abbf9e3 |
1044 | ssh_version = 2; |
e5574168 |
1045 | s_rdpkt = ssh2_rdpkt; |
1046 | } else { |
1047 | /* |
1048 | * This is a v1 server. Begin v1 protocol. |
1049 | */ |
1050 | sprintf(vstring, "SSH-%s-PuTTY\n", |
1051 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5")); |
1052 | sprintf(vlog, "We claim version: %s", vstring); |
1053 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1054 | logevent(vlog); |
1055 | logevent("Using SSH protocol version 1"); |
1056 | s_write(vstring, strlen(vstring)); |
1057 | ssh_protocol = ssh1_protocol; |
6abbf9e3 |
1058 | ssh_version = 1; |
e5574168 |
1059 | s_rdpkt = ssh1_rdpkt; |
1060 | } |
8ccc75b0 |
1061 | ssh_send_ok = 0; |
fef97f43 |
1062 | return 1; |
374330e2 |
1063 | } |
1064 | |
fb09bf1c |
1065 | /* |
1066 | * Handle the key exchange and user authentication phases. |
1067 | */ |
e5574168 |
1068 | static int do_ssh1_login(unsigned char *in, int inlen, int ispkt) |
fb09bf1c |
1069 | { |
374330e2 |
1070 | int i, j, len; |
374330e2 |
1071 | unsigned char *rsabuf, *keystr1, *keystr2; |
1072 | unsigned char cookie[8]; |
1073 | struct RSAKey servkey, hostkey; |
1074 | struct MD5Context md5c; |
ccbfb941 |
1075 | static unsigned long supported_ciphers_mask, supported_auths_mask; |
7cca0d81 |
1076 | static int tried_publickey; |
1077 | static unsigned char session_id[16]; |
bea1ef5f |
1078 | int cipher_type; |
374330e2 |
1079 | |
374330e2 |
1080 | crBegin; |
1081 | |
fb09bf1c |
1082 | if (!ispkt) crWaitUntil(ispkt); |
374330e2 |
1083 | |
8d5de777 |
1084 | if (pktin.type != SSH1_SMSG_PUBLIC_KEY) { |
1085 | bombout(("Public key packet not received")); |
1086 | crReturn(0); |
1087 | } |
374330e2 |
1088 | |
c5e9c988 |
1089 | logevent("Received public keys"); |
374330e2 |
1090 | |
c5e9c988 |
1091 | memcpy(cookie, pktin.body, 8); |
374330e2 |
1092 | |
7cca0d81 |
1093 | i = makekey(pktin.body+8, &servkey, &keystr1, 0); |
1094 | j = makekey(pktin.body+8+i, &hostkey, &keystr2, 0); |
374330e2 |
1095 | |
c5e9c988 |
1096 | /* |
1097 | * Hash the host key and print the hash in the log box. Just as |
1098 | * a last resort in case the registry's host key checking is |
1099 | * compromised, we'll allow the user some ability to verify |
1100 | * host keys by eye. |
1101 | */ |
1102 | MD5Init(&md5c); |
1103 | MD5Update(&md5c, keystr2, hostkey.bytes); |
1104 | MD5Final(session_id, &md5c); |
1105 | { |
1106 | char logmsg[80]; |
1107 | int i; |
1108 | logevent("Host key MD5 is:"); |
1109 | strcpy(logmsg, " "); |
1110 | for (i = 0; i < 16; i++) |
1111 | sprintf(logmsg+strlen(logmsg), "%02x", session_id[i]); |
1112 | logevent(logmsg); |
1113 | } |
1114 | |
fb09bf1c |
1115 | supported_ciphers_mask = GET_32BIT(pktin.body+12+i+j); |
1116 | supported_auths_mask = GET_32BIT(pktin.body+16+i+j); |
bea1ef5f |
1117 | |
c5e9c988 |
1118 | MD5Init(&md5c); |
374330e2 |
1119 | MD5Update(&md5c, keystr2, hostkey.bytes); |
1120 | MD5Update(&md5c, keystr1, servkey.bytes); |
1121 | MD5Update(&md5c, pktin.body, 8); |
374330e2 |
1122 | MD5Final(session_id, &md5c); |
1123 | |
1124 | for (i=0; i<32; i++) |
1125 | session_key[i] = random_byte(); |
1126 | |
1127 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
1128 | |
1129 | rsabuf = malloc(len); |
1130 | if (!rsabuf) |
1131 | fatalbox("Out of memory"); |
1132 | |
89ee5268 |
1133 | /* |
1134 | * Verify the host key. |
1135 | */ |
1136 | { |
1137 | /* |
1138 | * First format the key into a string. |
1139 | */ |
1140 | int len = rsastr_len(&hostkey); |
1141 | char *keystr = malloc(len); |
1142 | if (!keystr) |
1143 | fatalbox("Out of memory"); |
1144 | rsastr_fmt(keystr, &hostkey); |
1145 | verify_ssh_host_key(savedhost, keystr); |
1146 | free(keystr); |
1147 | } |
374330e2 |
1148 | |
1149 | for (i=0; i<32; i++) { |
1150 | rsabuf[i] = session_key[i]; |
1151 | if (i < 16) |
1152 | rsabuf[i] ^= session_id[i]; |
1153 | } |
1154 | |
1155 | if (hostkey.bytes > servkey.bytes) { |
1156 | rsaencrypt(rsabuf, 32, &servkey); |
1157 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
1158 | } else { |
1159 | rsaencrypt(rsabuf, 32, &hostkey); |
1160 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
1161 | } |
1162 | |
c5e9c988 |
1163 | logevent("Encrypted session key"); |
1164 | |
bea1ef5f |
1165 | cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH : |
9697bfd2 |
1166 | cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES : |
bea1ef5f |
1167 | SSH_CIPHER_3DES; |
1168 | if ((supported_ciphers_mask & (1 << cipher_type)) == 0) { |
1169 | c_write("Selected cipher not supported, falling back to 3DES\r\n", 53); |
1170 | cipher_type = SSH_CIPHER_3DES; |
1171 | } |
c5e9c988 |
1172 | switch (cipher_type) { |
1173 | case SSH_CIPHER_3DES: logevent("Using 3DES encryption"); break; |
1174 | case SSH_CIPHER_DES: logevent("Using single-DES encryption"); break; |
1175 | case SSH_CIPHER_BLOWFISH: logevent("Using Blowfish encryption"); break; |
1176 | } |
bea1ef5f |
1177 | |
e5574168 |
1178 | send_packet(SSH1_CMSG_SESSION_KEY, |
fb09bf1c |
1179 | PKT_CHAR, cipher_type, |
1180 | PKT_DATA, cookie, 8, |
1181 | PKT_CHAR, (len*8) >> 8, PKT_CHAR, (len*8) & 0xFF, |
1182 | PKT_DATA, rsabuf, len, |
1183 | PKT_INT, 0, |
1184 | PKT_END); |
1185 | |
c5e9c988 |
1186 | logevent("Trying to enable encryption..."); |
374330e2 |
1187 | |
1188 | free(rsabuf); |
1189 | |
5e8358ad |
1190 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish_ssh1 : |
9697bfd2 |
1191 | cipher_type == SSH_CIPHER_DES ? &ssh_des : |
bea1ef5f |
1192 | &ssh_3des; |
374330e2 |
1193 | cipher->sesskey(session_key); |
1194 | |
fb09bf1c |
1195 | crWaitUntil(ispkt); |
374330e2 |
1196 | |
8d5de777 |
1197 | if (pktin.type != SSH1_SMSG_SUCCESS) { |
1198 | bombout(("Encryption not successfully enabled")); |
1199 | crReturn(0); |
1200 | } |
374330e2 |
1201 | |
c5e9c988 |
1202 | logevent("Successfully started encryption"); |
1203 | |
374330e2 |
1204 | fflush(stdout); |
1205 | { |
1206 | static char username[100]; |
1207 | static int pos = 0; |
1208 | static char c; |
67779be7 |
1209 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
374330e2 |
1210 | c_write("login as: ", 10); |
67779be7 |
1211 | ssh_send_ok = 1; |
374330e2 |
1212 | while (pos >= 0) { |
fb09bf1c |
1213 | crWaitUntil(!ispkt); |
374330e2 |
1214 | while (inlen--) switch (c = *in++) { |
1215 | case 10: case 13: |
1216 | username[pos] = 0; |
1217 | pos = -1; |
1218 | break; |
1219 | case 8: case 127: |
1220 | if (pos > 0) { |
1221 | c_write("\b \b", 3); |
1222 | pos--; |
1223 | } |
1224 | break; |
1225 | case 21: case 27: |
1226 | while (pos > 0) { |
1227 | c_write("\b \b", 3); |
1228 | pos--; |
1229 | } |
1230 | break; |
1231 | case 3: case 4: |
1232 | random_save_seed(); |
1233 | exit(0); |
1234 | break; |
1235 | default: |
40d24aa6 |
1236 | if (((c >= ' ' && c <= '~') || |
1237 | ((unsigned char)c >= 160)) && pos < 40) { |
374330e2 |
1238 | username[pos++] = c; |
1239 | c_write(&c, 1); |
1240 | } |
1241 | break; |
1242 | } |
1243 | } |
1244 | c_write("\r\n", 2); |
1245 | username[strcspn(username, "\n\r")] = '\0'; |
1246 | } else { |
1247 | char stuff[200]; |
1248 | strncpy(username, cfg.username, 99); |
1249 | username[99] = '\0'; |
67779be7 |
1250 | if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) { |
fb09bf1c |
1251 | sprintf(stuff, "Sent username \"%s\".\r\n", username); |
4017be6d |
1252 | c_write(stuff, strlen(stuff)); |
fb09bf1c |
1253 | } |
374330e2 |
1254 | } |
fb09bf1c |
1255 | |
e5574168 |
1256 | send_packet(SSH1_CMSG_USER, PKT_STR, username, PKT_END); |
c5e9c988 |
1257 | { |
1258 | char userlog[20+sizeof(username)]; |
1259 | sprintf(userlog, "Sent username \"%s\"", username); |
1260 | logevent(userlog); |
1261 | } |
374330e2 |
1262 | } |
1263 | |
fb09bf1c |
1264 | crWaitUntil(ispkt); |
374330e2 |
1265 | |
7cca0d81 |
1266 | tried_publickey = 0; |
1267 | |
e5574168 |
1268 | while (pktin.type == SSH1_SMSG_FAILURE) { |
374330e2 |
1269 | static char password[100]; |
1270 | static int pos; |
1271 | static char c; |
ccbfb941 |
1272 | static int pwpkt_type; |
ccbfb941 |
1273 | /* |
1274 | * Show password prompt, having first obtained it via a TIS |
18515c51 |
1275 | * or CryptoCard exchange if we're doing TIS or CryptoCard |
1276 | * authentication. |
ccbfb941 |
1277 | */ |
e5574168 |
1278 | pwpkt_type = SSH1_CMSG_AUTH_PASSWORD; |
5c58ad2d |
1279 | if (agent_exists()) { |
1280 | /* |
1281 | * Attempt RSA authentication using Pageant. |
1282 | */ |
1283 | static unsigned char request[5], *response, *p; |
1284 | static int responselen; |
1285 | static int i, nkeys; |
1286 | static int authed = FALSE; |
1287 | void *r; |
1288 | |
1289 | logevent("Pageant is running. Requesting keys."); |
1290 | |
1291 | /* Request the keys held by the agent. */ |
1292 | PUT_32BIT(request, 1); |
1293 | request[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES; |
1294 | agent_query(request, 5, &r, &responselen); |
1295 | response = (unsigned char *)r; |
1296 | if (response) { |
1297 | p = response + 5; |
1298 | nkeys = GET_32BIT(p); p += 4; |
1299 | { char buf[64]; sprintf(buf, "Pageant has %d keys", nkeys); |
1300 | logevent(buf); } |
1301 | for (i = 0; i < nkeys; i++) { |
1302 | static struct RSAKey key; |
1303 | static Bignum challenge; |
b8bb811a |
1304 | static char *commentp; |
1305 | static int commentlen; |
5c58ad2d |
1306 | |
1307 | { char buf[64]; sprintf(buf, "Trying Pageant key #%d", i); |
1308 | logevent(buf); } |
1309 | p += 4; |
1310 | p += ssh1_read_bignum(p, &key.exponent); |
1311 | p += ssh1_read_bignum(p, &key.modulus); |
b8bb811a |
1312 | commentlen = GET_32BIT(p); p += 4; |
1313 | commentp = p; p += commentlen; |
5c58ad2d |
1314 | send_packet(SSH1_CMSG_AUTH_RSA, |
1315 | PKT_BIGNUM, key.modulus, PKT_END); |
1316 | crWaitUntil(ispkt); |
1317 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1318 | logevent("Key refused"); |
1319 | continue; |
1320 | } |
1321 | logevent("Received RSA challenge"); |
1322 | ssh1_read_bignum(pktin.body, &challenge); |
1323 | { |
1324 | char *agentreq, *q, *ret; |
1325 | int len, retlen; |
1326 | len = 1 + 4; /* message type, bit count */ |
1327 | len += ssh1_bignum_length(key.exponent); |
1328 | len += ssh1_bignum_length(key.modulus); |
1329 | len += ssh1_bignum_length(challenge); |
1330 | len += 16; /* session id */ |
1331 | len += 4; /* response format */ |
1332 | agentreq = malloc(4 + len); |
1333 | PUT_32BIT(agentreq, len); |
1334 | q = agentreq + 4; |
1335 | *q++ = SSH_AGENTC_RSA_CHALLENGE; |
1336 | PUT_32BIT(q, ssh1_bignum_bitcount(key.modulus)); |
1337 | q += 4; |
1338 | q += ssh1_write_bignum(q, key.exponent); |
1339 | q += ssh1_write_bignum(q, key.modulus); |
1340 | q += ssh1_write_bignum(q, challenge); |
1341 | memcpy(q, session_id, 16); q += 16; |
1342 | PUT_32BIT(q, 1); /* response format */ |
1343 | agent_query(agentreq, len+4, &ret, &retlen); |
1344 | free(agentreq); |
1345 | if (ret) { |
1346 | if (ret[4] == SSH_AGENT_RSA_RESPONSE) { |
1347 | logevent("Sending Pageant's response"); |
1348 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1349 | PKT_DATA, ret+5, 16, PKT_END); |
1350 | free(ret); |
1351 | crWaitUntil(ispkt); |
1352 | if (pktin.type == SSH1_SMSG_SUCCESS) { |
1353 | logevent("Pageant's response accepted"); |
b8bb811a |
1354 | c_write("Authenticated using RSA key \"", |
1355 | 29); |
1356 | c_write(commentp, commentlen); |
1357 | c_write("\" from agent\r\n", 14); |
5c58ad2d |
1358 | authed = TRUE; |
1359 | } else |
1360 | logevent("Pageant's response not accepted"); |
1361 | } else { |
1362 | logevent("Pageant failed to answer challenge"); |
1363 | free(ret); |
1364 | } |
1365 | } else { |
1366 | logevent("No reply received from Pageant"); |
1367 | } |
1368 | } |
1369 | freebn(key.exponent); |
1370 | freebn(key.modulus); |
1371 | freebn(challenge); |
1372 | if (authed) |
1373 | break; |
1374 | } |
1375 | } |
1376 | if (authed) |
1377 | break; |
1378 | } |
7cca0d81 |
1379 | if (*cfg.keyfile && !tried_publickey) |
1380 | pwpkt_type = SSH1_CMSG_AUTH_RSA; |
fb09bf1c |
1381 | |
67779be7 |
1382 | if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD && |
1383 | !(flags & FLAG_INTERACTIVE)) { |
fb09bf1c |
1384 | char prompt[200]; |
1385 | sprintf(prompt, "%s@%s's password: ", cfg.username, savedhost); |
85ee8208 |
1386 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
1387 | /* |
1388 | * get_password failed to get a password (for |
1389 | * example because one was supplied on the command |
1390 | * line which has already failed to work). |
1391 | * Terminate. |
1392 | */ |
1393 | logevent("No more passwords to try"); |
1394 | ssh_state = SSH_STATE_CLOSED; |
1395 | crReturn(1); |
1396 | } |
fb09bf1c |
1397 | } else { |
1398 | |
7cca0d81 |
1399 | if (pktin.type == SSH1_SMSG_FAILURE && |
1400 | cfg.try_tis_auth && |
1401 | (supported_auths_mask & (1<<SSH1_AUTH_TIS))) { |
1402 | pwpkt_type = SSH1_CMSG_AUTH_TIS_RESPONSE; |
1403 | logevent("Requested TIS authentication"); |
1404 | send_packet(SSH1_CMSG_AUTH_TIS, PKT_END); |
1405 | crWaitUntil(ispkt); |
1406 | if (pktin.type != SSH1_SMSG_AUTH_TIS_CHALLENGE) { |
1407 | logevent("TIS authentication declined"); |
1408 | c_write("TIS authentication refused.\r\n", 29); |
1409 | } else { |
1410 | int challengelen = ((pktin.body[0] << 24) | |
1411 | (pktin.body[1] << 16) | |
1412 | (pktin.body[2] << 8) | |
1413 | (pktin.body[3])); |
1414 | logevent("Received TIS challenge"); |
1415 | c_write(pktin.body+4, challengelen); |
1416 | } |
1417 | } |
18515c51 |
1418 | if (pktin.type == SSH1_SMSG_FAILURE && |
1419 | cfg.try_tis_auth && |
1420 | (supported_auths_mask & (1<<SSH1_AUTH_CCARD))) { |
1421 | pwpkt_type = SSH1_CMSG_AUTH_CCARD_RESPONSE; |
1422 | logevent("Requested CryptoCard authentication"); |
1423 | send_packet(SSH1_CMSG_AUTH_CCARD, PKT_END); |
1424 | crWaitUntil(ispkt); |
1425 | if (pktin.type != SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
1426 | logevent("CryptoCard authentication declined"); |
1427 | c_write("CryptoCard authentication refused.\r\n", 29); |
1428 | } else { |
1429 | int challengelen = ((pktin.body[0] << 24) | |
1430 | (pktin.body[1] << 16) | |
1431 | (pktin.body[2] << 8) | |
1432 | (pktin.body[3])); |
1433 | logevent("Received CryptoCard challenge"); |
1434 | c_write(pktin.body+4, challengelen); |
1435 | c_write("\r\nResponse : ", 13); |
1436 | } |
1437 | } |
7cca0d81 |
1438 | if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) |
1439 | c_write("password: ", 10); |
1440 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
4017be6d |
1441 | if (flags & FLAG_VERBOSE) |
1442 | c_write("Trying public key authentication.\r\n", 35); |
7cca0d81 |
1443 | if (!rsakey_encrypted(cfg.keyfile)) { |
4017be6d |
1444 | if (flags & FLAG_VERBOSE) |
1445 | c_write("No passphrase required.\r\n", 25); |
7cca0d81 |
1446 | goto tryauth; |
1447 | } |
1448 | c_write("passphrase: ", 12); |
ccbfb941 |
1449 | } |
ccbfb941 |
1450 | |
7cca0d81 |
1451 | pos = 0; |
67779be7 |
1452 | ssh_send_ok = 1; |
7cca0d81 |
1453 | while (pos >= 0) { |
1454 | crWaitUntil(!ispkt); |
1455 | while (inlen--) switch (c = *in++) { |
1456 | case 10: case 13: |
1457 | password[pos] = 0; |
1458 | pos = -1; |
1459 | break; |
1460 | case 8: case 127: |
1461 | if (pos > 0) |
1462 | pos--; |
1463 | break; |
1464 | case 21: case 27: |
1465 | pos = 0; |
1466 | break; |
1467 | case 3: case 4: |
1468 | random_save_seed(); |
1469 | exit(0); |
1470 | break; |
1471 | default: |
1472 | if (((c >= ' ' && c <= '~') || |
1473 | ((unsigned char)c >= 160)) && pos < sizeof(password)) |
1474 | password[pos++] = c; |
1475 | break; |
1476 | } |
1477 | } |
1478 | c_write("\r\n", 2); |
fb09bf1c |
1479 | |
1480 | } |
1481 | |
7cca0d81 |
1482 | tryauth: |
1483 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
1484 | /* |
1485 | * Try public key authentication with the specified |
1486 | * key file. |
1487 | */ |
1488 | static struct RSAKey pubkey; |
1489 | static Bignum challenge, response; |
1490 | static int i; |
1491 | static unsigned char buffer[32]; |
1492 | |
1493 | tried_publickey = 1; |
1494 | i = loadrsakey(cfg.keyfile, &pubkey, password); |
1495 | if (i == 0) { |
1496 | c_write("Couldn't load public key from ", 30); |
1497 | c_write(cfg.keyfile, strlen(cfg.keyfile)); |
1498 | c_write(".\r\n", 3); |
1499 | continue; /* go and try password */ |
1500 | } |
1501 | if (i == -1) { |
1502 | c_write("Wrong passphrase.\r\n", 19); |
1503 | tried_publickey = 0; |
1504 | continue; /* try again */ |
1505 | } |
1506 | |
1507 | /* |
1508 | * Send a public key attempt. |
1509 | */ |
1510 | send_packet(SSH1_CMSG_AUTH_RSA, |
1511 | PKT_BIGNUM, pubkey.modulus, PKT_END); |
1512 | |
1513 | crWaitUntil(ispkt); |
1514 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1515 | if (flags & FLAG_VERBOSE) |
1516 | c_write("Server refused our public key.\r\n", 32); |
7cca0d81 |
1517 | continue; /* go and try password */ |
1518 | } |
8d5de777 |
1519 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1520 | bombout(("Bizarre response to offer of public key")); |
1521 | crReturn(0); |
1522 | } |
7cca0d81 |
1523 | ssh1_read_bignum(pktin.body, &challenge); |
1524 | response = rsadecrypt(challenge, &pubkey); |
1525 | freebn(pubkey.private_exponent); /* burn the evidence */ |
1526 | |
1527 | for (i = 0; i < 32; i += 2) { |
1528 | buffer[i] = response[16-i/2] >> 8; |
1529 | buffer[i+1] = response[16-i/2] & 0xFF; |
1530 | } |
1531 | |
1532 | MD5Init(&md5c); |
1533 | MD5Update(&md5c, buffer, 32); |
1534 | MD5Update(&md5c, session_id, 16); |
1535 | MD5Final(buffer, &md5c); |
1536 | |
1537 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1538 | PKT_DATA, buffer, 16, PKT_END); |
1539 | |
1540 | crWaitUntil(ispkt); |
1541 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1542 | if (flags & FLAG_VERBOSE) |
1543 | c_write("Failed to authenticate with our public key.\r\n", |
1544 | 45); |
7cca0d81 |
1545 | continue; /* go and try password */ |
1546 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1547 | bombout(("Bizarre response to RSA authentication response")); |
1548 | crReturn(0); |
7cca0d81 |
1549 | } |
1550 | |
1551 | break; /* we're through! */ |
1552 | } else { |
1553 | send_packet(pwpkt_type, PKT_STR, password, PKT_END); |
1554 | } |
c5e9c988 |
1555 | logevent("Sent password"); |
374330e2 |
1556 | memset(password, 0, strlen(password)); |
fb09bf1c |
1557 | crWaitUntil(ispkt); |
e5574168 |
1558 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1559 | if (flags & FLAG_VERBOSE) |
1560 | c_write("Access denied\r\n", 15); |
c5e9c988 |
1561 | logevent("Authentication refused"); |
e5574168 |
1562 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
fb09bf1c |
1563 | logevent("Received disconnect request"); |
85ee8208 |
1564 | ssh_state = SSH_STATE_CLOSED; |
1565 | crReturn(1); |
e5574168 |
1566 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1567 | bombout(("Strange packet received, type %d", pktin.type)); |
1568 | crReturn(0); |
374330e2 |
1569 | } |
1570 | } |
1571 | |
c5e9c988 |
1572 | logevent("Authentication successful"); |
1573 | |
fb09bf1c |
1574 | crFinish(1); |
1575 | } |
1576 | |
e5574168 |
1577 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt) { |
fb09bf1c |
1578 | crBegin; |
1579 | |
1580 | random_init(); |
1581 | |
e5574168 |
1582 | while (!do_ssh1_login(in, inlen, ispkt)) { |
fb09bf1c |
1583 | crReturnV; |
85ee8208 |
1584 | } |
1585 | if (ssh_state == SSH_STATE_CLOSED) |
1586 | crReturnV; |
fb09bf1c |
1587 | |
979310f1 |
1588 | if (cfg.agentfwd && agent_exists()) { |
dacbd0e8 |
1589 | logevent("Requesting agent forwarding"); |
1590 | send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING, PKT_END); |
1591 | do { crReturnV; } while (!ispkt); |
1592 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
1593 | bombout(("Protocol confusion")); |
1594 | crReturnV; |
dacbd0e8 |
1595 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
1596 | logevent("Agent forwarding refused"); |
1597 | } else |
1598 | logevent("Agent forwarding enabled"); |
1599 | } |
1600 | |
fef97f43 |
1601 | if (!cfg.nopty) { |
e5574168 |
1602 | send_packet(SSH1_CMSG_REQUEST_PTY, |
fb09bf1c |
1603 | PKT_STR, cfg.termtype, |
1604 | PKT_INT, rows, PKT_INT, cols, |
1605 | PKT_INT, 0, PKT_INT, 0, |
1606 | PKT_CHAR, 0, |
1607 | PKT_END); |
fef97f43 |
1608 | ssh_state = SSH_STATE_INTERMED; |
1609 | do { crReturnV; } while (!ispkt); |
e5574168 |
1610 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
1611 | bombout(("Protocol confusion")); |
1612 | crReturnV; |
e5574168 |
1613 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
fef97f43 |
1614 | c_write("Server refused to allocate pty\r\n", 32); |
1615 | } |
c5e9c988 |
1616 | logevent("Allocated pty"); |
374330e2 |
1617 | } |
1618 | |
6abbf9e3 |
1619 | if (*cfg.remote_cmd) |
1620 | send_packet(SSH1_CMSG_EXEC_CMD, PKT_STR, cfg.remote_cmd, PKT_END); |
1621 | else |
1622 | send_packet(SSH1_CMSG_EXEC_SHELL, PKT_END); |
c5e9c988 |
1623 | logevent("Started session"); |
374330e2 |
1624 | |
1625 | ssh_state = SSH_STATE_SESSION; |
1626 | if (size_needed) |
1627 | ssh_size(); |
1628 | |
8ccc75b0 |
1629 | ssh_send_ok = 1; |
dacbd0e8 |
1630 | ssh_channels = newtree234(ssh_channelcmp); |
6f34e365 |
1631 | begin_session(); |
374330e2 |
1632 | while (1) { |
1633 | crReturnV; |
1634 | if (ispkt) { |
e5574168 |
1635 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
1636 | pktin.type == SSH1_SMSG_STDERR_DATA) { |
fb09bf1c |
1637 | long len = GET_32BIT(pktin.body); |
1638 | c_write(pktin.body+4, len); |
e5574168 |
1639 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
21248260 |
1640 | ssh_state = SSH_STATE_CLOSED; |
c5e9c988 |
1641 | logevent("Received disconnect request"); |
dacbd0e8 |
1642 | } else if (pktin.type == SSH1_SMSG_AGENT_OPEN) { |
1643 | /* Remote side is trying to open a channel to talk to our |
1644 | * agent. Give them back a local channel number. */ |
d211621f |
1645 | unsigned i = 1; |
dacbd0e8 |
1646 | struct ssh_channel *c; |
1647 | enum234 e; |
1648 | for (c = first234(ssh_channels, &e); c; c = next234(&e)) { |
1649 | if (c->localid > i) |
1650 | break; /* found a free number */ |
1651 | i = c->localid + 1; |
1652 | } |
1653 | c = malloc(sizeof(struct ssh_channel)); |
1654 | c->remoteid = GET_32BIT(pktin.body); |
1655 | c->localid = i; |
b8bb811a |
1656 | c->closes = 0; |
dacbd0e8 |
1657 | c->type = SSH1_SMSG_AGENT_OPEN; /* identify channel type */ |
1658 | add234(ssh_channels, c); |
1659 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
1660 | PKT_INT, c->remoteid, PKT_INT, c->localid, |
1661 | PKT_END); |
1662 | } else if (pktin.type == SSH1_MSG_CHANNEL_CLOSE || |
1663 | pktin.type == SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION) { |
1664 | /* Remote side closes a channel. */ |
d211621f |
1665 | unsigned i = GET_32BIT(pktin.body); |
dacbd0e8 |
1666 | struct ssh_channel *c; |
1667 | c = find234(ssh_channels, &i, ssh_channelfind); |
1668 | if (c) { |
1669 | int closetype; |
1670 | closetype = (pktin.type == SSH1_MSG_CHANNEL_CLOSE ? 1 : 2); |
1671 | send_packet(pktin.type, PKT_INT, c->remoteid, PKT_END); |
1672 | c->closes |= closetype; |
1673 | if (c->closes == 3) { |
1674 | del234(ssh_channels, c); |
1675 | free(c); |
1676 | } |
1677 | } |
1678 | } else if (pktin.type == SSH1_MSG_CHANNEL_DATA) { |
1679 | /* Data sent down one of our channels. */ |
1680 | int i = GET_32BIT(pktin.body); |
1681 | int len = GET_32BIT(pktin.body+4); |
1682 | unsigned char *p = pktin.body+8; |
1683 | struct ssh_channel *c; |
1684 | c = find234(ssh_channels, &i, ssh_channelfind); |
1685 | if (c) { |
1686 | switch(c->type) { |
1687 | case SSH1_SMSG_AGENT_OPEN: |
1688 | /* Data for an agent message. Buffer it. */ |
1689 | while (len > 0) { |
1690 | if (c->u.a.lensofar < 4) { |
1691 | int l = min(4 - c->u.a.lensofar, len); |
1692 | memcpy(c->u.a.msglen + c->u.a.lensofar, p, l); |
1693 | p += l; len -= l; c->u.a.lensofar += l; |
1694 | } |
1695 | if (c->u.a.lensofar == 4) { |
1696 | c->u.a.totallen = 4 + GET_32BIT(c->u.a.msglen); |
1697 | c->u.a.message = malloc(c->u.a.totallen); |
1698 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
1699 | } |
1700 | if (c->u.a.lensofar >= 4 && len > 0) { |
1701 | int l = min(c->u.a.totallen - c->u.a.lensofar, len); |
1702 | memcpy(c->u.a.message + c->u.a.lensofar, p, l); |
1703 | p += l; len -= l; c->u.a.lensofar += l; |
1704 | } |
1705 | if (c->u.a.lensofar == c->u.a.totallen) { |
1706 | void *reply, *sentreply; |
1707 | int replylen; |
1708 | agent_query(c->u.a.message, c->u.a.totallen, |
1709 | &reply, &replylen); |
1710 | if (reply) |
1711 | sentreply = reply; |
1712 | else { |
1713 | /* Fake SSH_AGENT_FAILURE. */ |
1714 | sentreply = "\0\0\0\1\5"; |
1715 | replylen = 5; |
1716 | } |
1717 | send_packet(SSH1_MSG_CHANNEL_DATA, |
1718 | PKT_INT, c->remoteid, |
1719 | PKT_INT, replylen, |
1720 | PKT_DATA, sentreply, replylen, |
1721 | PKT_END); |
1722 | if (reply) |
1723 | free(reply); |
1724 | free(c->u.a.message); |
1725 | c->u.a.lensofar = 0; |
1726 | } |
1727 | } |
1728 | break; |
1729 | } |
1730 | } |
e5574168 |
1731 | } else if (pktin.type == SSH1_SMSG_SUCCESS) { |
972a41c8 |
1732 | /* may be from EXEC_SHELL on some servers */ |
e5574168 |
1733 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
972a41c8 |
1734 | /* may be from EXEC_SHELL on some servers |
374330e2 |
1735 | * if no pty is available or in other odd cases. Ignore */ |
e5574168 |
1736 | } else if (pktin.type == SSH1_SMSG_EXIT_STATUS) { |
1737 | send_packet(SSH1_CMSG_EXIT_CONFIRMATION, PKT_END); |
374330e2 |
1738 | } else { |
8d5de777 |
1739 | bombout(("Strange packet received: type %d", pktin.type)); |
1740 | crReturnV; |
374330e2 |
1741 | } |
1742 | } else { |
e5574168 |
1743 | send_packet(SSH1_CMSG_STDIN_DATA, |
fb09bf1c |
1744 | PKT_INT, inlen, PKT_DATA, in, inlen, PKT_END); |
374330e2 |
1745 | } |
1746 | } |
1747 | |
1748 | crFinishV; |
1749 | } |
1750 | |
1751 | /* |
e5574168 |
1752 | * Utility routine for decoding comma-separated strings in KEXINIT. |
1753 | */ |
1754 | int in_commasep_string(char *needle, char *haystack, int haylen) { |
1755 | int needlen = strlen(needle); |
1756 | while (1) { |
1757 | /* |
1758 | * Is it at the start of the string? |
1759 | */ |
1760 | if (haylen >= needlen && /* haystack is long enough */ |
1761 | !memcmp(needle, haystack, needlen) && /* initial match */ |
1762 | (haylen == needlen || haystack[needlen] == ',') |
1763 | /* either , or EOS follows */ |
1764 | ) |
1765 | return 1; |
1766 | /* |
1767 | * If not, search for the next comma and resume after that. |
1768 | * If no comma found, terminate. |
1769 | */ |
1770 | while (haylen > 0 && *haystack != ',') |
1771 | haylen--, haystack++; |
1772 | if (haylen == 0) |
1773 | return 0; |
1774 | haylen--, haystack++; /* skip over comma itself */ |
1775 | } |
1776 | } |
1777 | |
1778 | /* |
d39f364a |
1779 | * SSH2 key creation method. |
1780 | */ |
1781 | void ssh2_mkkey(Bignum K, char *H, char chr, char *keyspace) { |
1782 | SHA_State s; |
1783 | /* First 20 bytes. */ |
1784 | SHA_Init(&s); |
1785 | sha_mpint(&s, K); |
1786 | SHA_Bytes(&s, H, 20); |
1787 | SHA_Bytes(&s, &chr, 1); |
1788 | SHA_Bytes(&s, H, 20); |
1789 | SHA_Final(&s, keyspace); |
1790 | /* Next 20 bytes. */ |
1791 | SHA_Init(&s); |
1792 | sha_mpint(&s, K); |
1793 | SHA_Bytes(&s, H, 20); |
1794 | SHA_Bytes(&s, keyspace, 20); |
1795 | SHA_Final(&s, keyspace+20); |
1796 | } |
1797 | |
1798 | /* |
7cca0d81 |
1799 | * Handle the SSH2 transport layer. |
e5574168 |
1800 | */ |
7cca0d81 |
1801 | static int do_ssh2_transport(unsigned char *in, int inlen, int ispkt) |
e5574168 |
1802 | { |
1803 | static int i, len; |
1804 | static char *str; |
1805 | static Bignum e, f, K; |
1806 | static struct ssh_cipher *cscipher_tobe = NULL; |
1807 | static struct ssh_cipher *sccipher_tobe = NULL; |
1808 | static struct ssh_mac *csmac_tobe = NULL; |
1809 | static struct ssh_mac *scmac_tobe = NULL; |
1810 | static struct ssh_compress *cscomp_tobe = NULL; |
1811 | static struct ssh_compress *sccomp_tobe = NULL; |
7cca0d81 |
1812 | static char *hostkeydata, *sigdata, *keystr; |
e5574168 |
1813 | static int hostkeylen, siglen; |
1814 | static unsigned char exchange_hash[20]; |
d39f364a |
1815 | static unsigned char keyspace[40]; |
e5574168 |
1816 | |
1817 | crBegin; |
7cca0d81 |
1818 | random_init(); |
e5574168 |
1819 | |
5e8358ad |
1820 | /* |
1821 | * Set up the preferred cipher. |
1822 | */ |
1823 | if (cfg.cipher == CIPHER_BLOWFISH) { |
1824 | ciphers[0] = &ssh_blowfish_ssh2; |
1825 | } else if (cfg.cipher == CIPHER_DES) { |
1826 | logevent("Single DES not supported in SSH2; using 3DES"); |
1827 | ciphers[0] = &ssh_3des_ssh2; |
1828 | } else if (cfg.cipher == CIPHER_3DES) { |
1829 | ciphers[0] = &ssh_3des_ssh2; |
1830 | } else { |
1831 | /* Shouldn't happen, but we do want to initialise to _something_. */ |
1832 | ciphers[0] = &ssh_3des_ssh2; |
1833 | } |
1834 | |
7cca0d81 |
1835 | begin_key_exchange: |
e5574168 |
1836 | /* |
1837 | * Construct and send our key exchange packet. |
1838 | */ |
1839 | ssh2_pkt_init(SSH2_MSG_KEXINIT); |
1840 | for (i = 0; i < 16; i++) |
1841 | ssh2_pkt_addbyte((unsigned char)random_byte()); |
1842 | /* List key exchange algorithms. */ |
1843 | ssh2_pkt_addstring_start(); |
1844 | for (i = 0; i < lenof(kex_algs); i++) { |
1845 | ssh2_pkt_addstring_str(kex_algs[i]->name); |
1846 | if (i < lenof(kex_algs)-1) |
1847 | ssh2_pkt_addstring_str(","); |
1848 | } |
1849 | /* List server host key algorithms. */ |
1850 | ssh2_pkt_addstring_start(); |
1851 | for (i = 0; i < lenof(hostkey_algs); i++) { |
1852 | ssh2_pkt_addstring_str(hostkey_algs[i]->name); |
1853 | if (i < lenof(hostkey_algs)-1) |
1854 | ssh2_pkt_addstring_str(","); |
1855 | } |
1856 | /* List client->server encryption algorithms. */ |
1857 | ssh2_pkt_addstring_start(); |
1858 | for (i = 0; i < lenof(ciphers); i++) { |
1859 | ssh2_pkt_addstring_str(ciphers[i]->name); |
1860 | if (i < lenof(ciphers)-1) |
1861 | ssh2_pkt_addstring_str(","); |
1862 | } |
1863 | /* List server->client encryption algorithms. */ |
1864 | ssh2_pkt_addstring_start(); |
1865 | for (i = 0; i < lenof(ciphers); i++) { |
1866 | ssh2_pkt_addstring_str(ciphers[i]->name); |
1867 | if (i < lenof(ciphers)-1) |
1868 | ssh2_pkt_addstring_str(","); |
1869 | } |
1870 | /* List client->server MAC algorithms. */ |
1871 | ssh2_pkt_addstring_start(); |
1872 | for (i = 0; i < lenof(macs); i++) { |
1873 | ssh2_pkt_addstring_str(macs[i]->name); |
1874 | if (i < lenof(macs)-1) |
1875 | ssh2_pkt_addstring_str(","); |
1876 | } |
1877 | /* List server->client MAC algorithms. */ |
1878 | ssh2_pkt_addstring_start(); |
1879 | for (i = 0; i < lenof(macs); i++) { |
1880 | ssh2_pkt_addstring_str(macs[i]->name); |
1881 | if (i < lenof(macs)-1) |
1882 | ssh2_pkt_addstring_str(","); |
1883 | } |
1884 | /* List client->server compression algorithms. */ |
1885 | ssh2_pkt_addstring_start(); |
1886 | for (i = 0; i < lenof(compressions); i++) { |
1887 | ssh2_pkt_addstring_str(compressions[i]->name); |
1888 | if (i < lenof(compressions)-1) |
1889 | ssh2_pkt_addstring_str(","); |
1890 | } |
1891 | /* List server->client compression algorithms. */ |
1892 | ssh2_pkt_addstring_start(); |
1893 | for (i = 0; i < lenof(compressions); i++) { |
1894 | ssh2_pkt_addstring_str(compressions[i]->name); |
1895 | if (i < lenof(compressions)-1) |
1896 | ssh2_pkt_addstring_str(","); |
1897 | } |
1898 | /* List client->server languages. Empty list. */ |
1899 | ssh2_pkt_addstring_start(); |
1900 | /* List server->client languages. Empty list. */ |
1901 | ssh2_pkt_addstring_start(); |
1902 | /* First KEX packet does _not_ follow, because we're not that brave. */ |
1903 | ssh2_pkt_addbool(FALSE); |
1904 | /* Reserved. */ |
1905 | ssh2_pkt_adduint32(0); |
1906 | sha_string(&exhash, pktout.data+5, pktout.length-5); |
1907 | ssh2_pkt_send(); |
1908 | |
1909 | if (!ispkt) crWaitUntil(ispkt); |
1910 | sha_string(&exhash, pktin.data+5, pktin.length-5); |
1911 | |
1912 | /* |
1913 | * Now examine the other side's KEXINIT to see what we're up |
1914 | * to. |
1915 | */ |
7cca0d81 |
1916 | if (pktin.type != SSH2_MSG_KEXINIT) { |
8d5de777 |
1917 | bombout(("expected key exchange packet from server")); |
1918 | crReturn(0); |
7cca0d81 |
1919 | } |
e5574168 |
1920 | kex = NULL; hostkey = NULL; cscipher_tobe = NULL; sccipher_tobe = NULL; |
1921 | csmac_tobe = NULL; scmac_tobe = NULL; cscomp_tobe = NULL; sccomp_tobe = NULL; |
1922 | pktin.savedpos += 16; /* skip garbage cookie */ |
1923 | ssh2_pkt_getstring(&str, &len); /* key exchange algorithms */ |
1924 | for (i = 0; i < lenof(kex_algs); i++) { |
1925 | if (in_commasep_string(kex_algs[i]->name, str, len)) { |
1926 | kex = kex_algs[i]; |
1927 | break; |
1928 | } |
1929 | } |
1930 | ssh2_pkt_getstring(&str, &len); /* host key algorithms */ |
1931 | for (i = 0; i < lenof(hostkey_algs); i++) { |
1932 | if (in_commasep_string(hostkey_algs[i]->name, str, len)) { |
1933 | hostkey = hostkey_algs[i]; |
1934 | break; |
1935 | } |
1936 | } |
1937 | ssh2_pkt_getstring(&str, &len); /* client->server cipher */ |
1938 | for (i = 0; i < lenof(ciphers); i++) { |
1939 | if (in_commasep_string(ciphers[i]->name, str, len)) { |
1940 | cscipher_tobe = ciphers[i]; |
1941 | break; |
1942 | } |
1943 | } |
1944 | ssh2_pkt_getstring(&str, &len); /* server->client cipher */ |
1945 | for (i = 0; i < lenof(ciphers); i++) { |
1946 | if (in_commasep_string(ciphers[i]->name, str, len)) { |
1947 | sccipher_tobe = ciphers[i]; |
1948 | break; |
1949 | } |
1950 | } |
1951 | ssh2_pkt_getstring(&str, &len); /* client->server mac */ |
1952 | for (i = 0; i < lenof(macs); i++) { |
1953 | if (in_commasep_string(macs[i]->name, str, len)) { |
1954 | csmac_tobe = macs[i]; |
1955 | break; |
1956 | } |
1957 | } |
1958 | ssh2_pkt_getstring(&str, &len); /* server->client mac */ |
1959 | for (i = 0; i < lenof(macs); i++) { |
1960 | if (in_commasep_string(macs[i]->name, str, len)) { |
1961 | scmac_tobe = macs[i]; |
1962 | break; |
1963 | } |
1964 | } |
1965 | ssh2_pkt_getstring(&str, &len); /* client->server compression */ |
1966 | for (i = 0; i < lenof(compressions); i++) { |
1967 | if (in_commasep_string(compressions[i]->name, str, len)) { |
1968 | cscomp_tobe = compressions[i]; |
1969 | break; |
1970 | } |
1971 | } |
1972 | ssh2_pkt_getstring(&str, &len); /* server->client compression */ |
1973 | for (i = 0; i < lenof(compressions); i++) { |
1974 | if (in_commasep_string(compressions[i]->name, str, len)) { |
1975 | sccomp_tobe = compressions[i]; |
1976 | break; |
1977 | } |
1978 | } |
e5574168 |
1979 | |
1980 | /* |
1981 | * Currently we only support Diffie-Hellman and DSS, so let's |
1982 | * bomb out if those aren't selected. |
1983 | */ |
8d5de777 |
1984 | if (kex != &ssh_diffiehellman || hostkey != &ssh_dss) { |
1985 | bombout(("internal fault: chaos in SSH 2 transport layer")); |
1986 | crReturn(0); |
1987 | } |
e5574168 |
1988 | |
1989 | /* |
1990 | * Now we begin the fun. Generate and send e for Diffie-Hellman. |
1991 | */ |
1992 | e = dh_create_e(); |
e5574168 |
1993 | ssh2_pkt_init(SSH2_MSG_KEXDH_INIT); |
1994 | ssh2_pkt_addmp(e); |
1995 | ssh2_pkt_send(); |
1996 | |
1997 | crWaitUntil(ispkt); |
7cca0d81 |
1998 | if (pktin.type != SSH2_MSG_KEXDH_REPLY) { |
8d5de777 |
1999 | bombout(("expected key exchange packet from server")); |
2000 | crReturn(0); |
7cca0d81 |
2001 | } |
e5574168 |
2002 | ssh2_pkt_getstring(&hostkeydata, &hostkeylen); |
2003 | f = ssh2_pkt_getmp(); |
e5574168 |
2004 | ssh2_pkt_getstring(&sigdata, &siglen); |
2005 | |
2006 | K = dh_find_K(f); |
e5574168 |
2007 | |
2008 | sha_string(&exhash, hostkeydata, hostkeylen); |
2009 | sha_mpint(&exhash, e); |
2010 | sha_mpint(&exhash, f); |
2011 | sha_mpint(&exhash, K); |
2012 | SHA_Final(&exhash, exchange_hash); |
2013 | |
7cca0d81 |
2014 | #if 0 |
e5574168 |
2015 | debug(("Exchange hash is:\r\n")); |
2016 | for (i = 0; i < 20; i++) |
2017 | debug((" %02x", exchange_hash[i])); |
2018 | debug(("\r\n")); |
7cca0d81 |
2019 | #endif |
2020 | |
2021 | hostkey->setkey(hostkeydata, hostkeylen); |
8d5de777 |
2022 | if (!hostkey->verifysig(sigdata, siglen, exchange_hash, 20)) { |
2023 | bombout(("Server failed host key check")); |
2024 | crReturn(0); |
2025 | } |
e5574168 |
2026 | |
2027 | /* |
7cca0d81 |
2028 | * Expect SSH2_MSG_NEWKEYS from server. |
d39f364a |
2029 | */ |
7cca0d81 |
2030 | crWaitUntil(ispkt); |
8d5de777 |
2031 | if (pktin.type != SSH2_MSG_NEWKEYS) { |
2032 | bombout(("expected new-keys packet from server")); |
2033 | crReturn(0); |
2034 | } |
d39f364a |
2035 | |
2036 | /* |
7cca0d81 |
2037 | * Authenticate remote host: verify host key. (We've already |
2038 | * checked the signature of the exchange hash.) |
e5574168 |
2039 | */ |
7cca0d81 |
2040 | keystr = hostkey->fmtkey(); |
2041 | verify_ssh_host_key(savedhost, keystr); |
2042 | free(keystr); |
d39f364a |
2043 | |
2044 | /* |
7cca0d81 |
2045 | * Send SSH2_MSG_NEWKEYS. |
d39f364a |
2046 | */ |
2047 | ssh2_pkt_init(SSH2_MSG_NEWKEYS); |
2048 | ssh2_pkt_send(); |
d39f364a |
2049 | |
2050 | /* |
2051 | * Create and initialise session keys. |
2052 | */ |
2053 | cscipher = cscipher_tobe; |
2054 | sccipher = sccipher_tobe; |
2055 | csmac = csmac_tobe; |
2056 | scmac = scmac_tobe; |
2057 | cscomp = cscomp_tobe; |
2058 | sccomp = sccomp_tobe; |
2059 | /* |
2060 | * Set IVs after keys. |
2061 | */ |
2062 | ssh2_mkkey(K, exchange_hash, 'C', keyspace); cscipher->setcskey(keyspace); |
2063 | ssh2_mkkey(K, exchange_hash, 'D', keyspace); cscipher->setsckey(keyspace); |
2064 | ssh2_mkkey(K, exchange_hash, 'A', keyspace); cscipher->setcsiv(keyspace); |
2065 | ssh2_mkkey(K, exchange_hash, 'B', keyspace); sccipher->setsciv(keyspace); |
2066 | ssh2_mkkey(K, exchange_hash, 'E', keyspace); csmac->setcskey(keyspace); |
2067 | ssh2_mkkey(K, exchange_hash, 'F', keyspace); scmac->setsckey(keyspace); |
2068 | |
033b4cef |
2069 | /* |
7cca0d81 |
2070 | * Now we're encrypting. Begin returning 1 to the protocol main |
2071 | * function so that other things can run on top of the |
2072 | * transport. If we ever see a KEXINIT, we must go back to the |
2073 | * start. |
033b4cef |
2074 | */ |
7cca0d81 |
2075 | do { |
2076 | crReturn(1); |
2077 | } while (!(ispkt && pktin.type == SSH2_MSG_KEXINIT)); |
2078 | goto begin_key_exchange; |
e5574168 |
2079 | |
2080 | crFinish(1); |
2081 | } |
2082 | |
7cca0d81 |
2083 | /* |
2084 | * Handle the SSH2 userauth and connection layers. |
2085 | */ |
2086 | static void do_ssh2_authconn(unsigned char *in, int inlen, int ispkt) |
2087 | { |
7cca0d81 |
2088 | static unsigned long remote_winsize; |
2089 | static unsigned long remote_maxpkt; |
2090 | |
e5574168 |
2091 | crBegin; |
2092 | |
7cca0d81 |
2093 | /* |
2094 | * Request userauth protocol, and await a response to it. |
2095 | */ |
2096 | ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST); |
2097 | ssh2_pkt_addstring("ssh-userauth"); |
2098 | ssh2_pkt_send(); |
2099 | crWaitUntilV(ispkt); |
8d5de777 |
2100 | if (pktin.type != SSH2_MSG_SERVICE_ACCEPT) { |
2101 | bombout(("Server refused user authentication protocol")); |
2102 | crReturnV; |
2103 | } |
7cca0d81 |
2104 | |
2105 | /* |
2106 | * FIXME: currently we support only password authentication. |
2107 | * (This places us technically in violation of the SSH2 spec. |
2108 | * We must fix this.) |
2109 | */ |
2110 | while (1) { |
2111 | /* |
2112 | * Get a username and a password. |
2113 | */ |
2114 | static char username[100]; |
2115 | static char password[100]; |
2116 | static int pos = 0; |
2117 | static char c; |
e5574168 |
2118 | |
67779be7 |
2119 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
7cca0d81 |
2120 | c_write("login as: ", 10); |
67779be7 |
2121 | ssh_send_ok = 1; |
7cca0d81 |
2122 | while (pos >= 0) { |
2123 | crWaitUntilV(!ispkt); |
2124 | while (inlen--) switch (c = *in++) { |
2125 | case 10: case 13: |
2126 | username[pos] = 0; |
2127 | pos = -1; |
2128 | break; |
2129 | case 8: case 127: |
2130 | if (pos > 0) { |
2131 | c_write("\b \b", 3); |
2132 | pos--; |
2133 | } |
2134 | break; |
2135 | case 21: case 27: |
2136 | while (pos > 0) { |
2137 | c_write("\b \b", 3); |
2138 | pos--; |
2139 | } |
2140 | break; |
2141 | case 3: case 4: |
2142 | random_save_seed(); |
2143 | exit(0); |
2144 | break; |
2145 | default: |
2146 | if (((c >= ' ' && c <= '~') || |
2147 | ((unsigned char)c >= 160)) && pos < 40) { |
2148 | username[pos++] = c; |
2149 | c_write(&c, 1); |
2150 | } |
2151 | break; |
2152 | } |
2153 | } |
2154 | c_write("\r\n", 2); |
2155 | username[strcspn(username, "\n\r")] = '\0'; |
2156 | } else { |
2157 | char stuff[200]; |
2158 | strncpy(username, cfg.username, 99); |
2159 | username[99] = '\0'; |
67779be7 |
2160 | if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) { |
7cca0d81 |
2161 | sprintf(stuff, "Using username \"%s\".\r\n", username); |
2162 | c_write(stuff, strlen(stuff)); |
2163 | } |
2164 | } |
2165 | |
67779be7 |
2166 | if (!(flags & FLAG_INTERACTIVE)) { |
7cca0d81 |
2167 | char prompt[200]; |
2168 | sprintf(prompt, "%s@%s's password: ", cfg.username, savedhost); |
2169 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
2170 | /* |
2171 | * get_password failed to get a password (for |
2172 | * example because one was supplied on the command |
2173 | * line which has already failed to work). |
2174 | * Terminate. |
2175 | */ |
2176 | logevent("No more passwords to try"); |
2177 | ssh_state = SSH_STATE_CLOSED; |
2178 | crReturnV; |
2179 | } |
2180 | } else { |
2181 | c_write("password: ", 10); |
67779be7 |
2182 | ssh_send_ok = 1; |
7cca0d81 |
2183 | |
2184 | pos = 0; |
2185 | while (pos >= 0) { |
2186 | crWaitUntilV(!ispkt); |
2187 | while (inlen--) switch (c = *in++) { |
2188 | case 10: case 13: |
2189 | password[pos] = 0; |
2190 | pos = -1; |
2191 | break; |
2192 | case 8: case 127: |
2193 | if (pos > 0) |
2194 | pos--; |
2195 | break; |
2196 | case 21: case 27: |
2197 | pos = 0; |
2198 | break; |
2199 | case 3: case 4: |
2200 | random_save_seed(); |
2201 | exit(0); |
2202 | break; |
2203 | default: |
2204 | if (((c >= ' ' && c <= '~') || |
2205 | ((unsigned char)c >= 160)) && pos < 40) |
2206 | password[pos++] = c; |
2207 | break; |
2208 | } |
2209 | } |
2210 | c_write("\r\n", 2); |
2211 | } |
2212 | |
2213 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
2214 | ssh2_pkt_addstring(username); |
2215 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
2216 | ssh2_pkt_addstring("password"); |
2217 | ssh2_pkt_addbool(FALSE); |
2218 | ssh2_pkt_addstring(password); |
2219 | ssh2_pkt_send(); |
2220 | |
2221 | crWaitUntilV(ispkt); |
2222 | if (pktin.type != SSH2_MSG_USERAUTH_SUCCESS) { |
2223 | c_write("Access denied\r\n", 15); |
2224 | logevent("Authentication refused"); |
2225 | } else |
2226 | break; |
2227 | } |
2228 | |
2229 | /* |
2230 | * Now we're authenticated for the connection protocol. The |
2231 | * connection protocol will automatically have started at this |
2232 | * point; there's no need to send SERVICE_REQUEST. |
2233 | */ |
2234 | |
2235 | /* |
2236 | * So now create a channel with a session in it. |
2237 | */ |
d211621f |
2238 | mainchan = malloc(sizeof(struct ssh_channel)); |
2239 | mainchan->localid = 100; /* as good as any */ |
7cca0d81 |
2240 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
2241 | ssh2_pkt_addstring("session"); |
d211621f |
2242 | ssh2_pkt_adduint32(mainchan->localid); |
2243 | ssh2_pkt_adduint32(0x7FFFFFFFUL); /* our window size */ |
2244 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
7cca0d81 |
2245 | ssh2_pkt_send(); |
2246 | crWaitUntilV(ispkt); |
2247 | if (pktin.type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) { |
8d5de777 |
2248 | bombout(("Server refused to open a session")); |
2249 | crReturnV; |
7cca0d81 |
2250 | /* FIXME: error data comes back in FAILURE packet */ |
2251 | } |
d211621f |
2252 | if (ssh2_pkt_getuint32() != mainchan->localid) { |
8d5de777 |
2253 | bombout(("Server's channel confirmation cited wrong channel")); |
2254 | crReturnV; |
7cca0d81 |
2255 | } |
d211621f |
2256 | mainchan->remoteid = ssh2_pkt_getuint32(); |
2257 | mainchan->u.v2.remwindow = ssh2_pkt_getuint32(); |
2258 | mainchan->u.v2.remmaxpkt = ssh2_pkt_getuint32(); |
2259 | mainchan->u.v2.outbuffer = NULL; |
2260 | mainchan->u.v2.outbuflen = mainchan->u.v2.outbufsize = 0; |
7cca0d81 |
2261 | logevent("Opened channel for session"); |
2262 | |
2263 | /* |
2264 | * Now allocate a pty for the session. |
2265 | */ |
67779be7 |
2266 | if (!cfg.nopty) { |
2267 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
2268 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
2269 | ssh2_pkt_addstring("pty-req"); |
2270 | ssh2_pkt_addbool(1); /* want reply */ |
2271 | ssh2_pkt_addstring(cfg.termtype); |
2272 | ssh2_pkt_adduint32(cols); |
2273 | ssh2_pkt_adduint32(rows); |
2274 | ssh2_pkt_adduint32(0); /* pixel width */ |
2275 | ssh2_pkt_adduint32(0); /* pixel height */ |
2276 | ssh2_pkt_addstring_start(); |
2277 | ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */ |
2278 | ssh2_pkt_send(); |
7cca0d81 |
2279 | |
67779be7 |
2280 | do { |
2281 | crWaitUntilV(ispkt); |
2282 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
2283 | /* FIXME: be able to handle other channels here */ |
2284 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2285 | continue; /* wrong channel */ |
2286 | mainchan->u.v2.remwindow += ssh2_pkt_getuint32(); |
2287 | } |
2288 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
7cca0d81 |
2289 | |
67779be7 |
2290 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
2291 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
2292 | bombout(("Server got confused by pty request")); |
2293 | crReturnV; |
67779be7 |
2294 | } |
2295 | c_write("Server refused to allocate pty\r\n", 32); |
2296 | } else { |
2297 | logevent("Allocated pty"); |
7cca0d81 |
2298 | } |
7cca0d81 |
2299 | } |
2300 | |
2301 | /* |
67779be7 |
2302 | * Start a shell or a remote command. |
7cca0d81 |
2303 | */ |
2304 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
d211621f |
2305 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
67779be7 |
2306 | if (*cfg.remote_cmd) { |
2307 | ssh2_pkt_addstring("exec"); |
2308 | ssh2_pkt_addbool(1); /* want reply */ |
2309 | ssh2_pkt_addstring(cfg.remote_cmd); |
2310 | } else { |
2311 | ssh2_pkt_addstring("shell"); |
2312 | ssh2_pkt_addbool(1); /* want reply */ |
2313 | } |
7cca0d81 |
2314 | ssh2_pkt_send(); |
d211621f |
2315 | do { |
7cca0d81 |
2316 | crWaitUntilV(ispkt); |
d211621f |
2317 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
2318 | /* FIXME: be able to handle other channels here */ |
2319 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2320 | continue; /* wrong channel */ |
2321 | mainchan->u.v2.remwindow += ssh2_pkt_getuint32(); |
2322 | } |
7cca0d81 |
2323 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2324 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
2325 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
2326 | bombout(("Server got confused by shell/command request")); |
2327 | crReturnV; |
7cca0d81 |
2328 | } |
8d5de777 |
2329 | bombout(("Server refused to start a shell/command")); |
2330 | crReturnV; |
7cca0d81 |
2331 | } else { |
8d5de777 |
2332 | logevent("Started a shell/command"); |
7cca0d81 |
2333 | } |
2334 | |
2335 | /* |
2336 | * Transfer data! |
2337 | */ |
8ccc75b0 |
2338 | ssh_send_ok = 1; |
6f34e365 |
2339 | begin_session(); |
7cca0d81 |
2340 | while (1) { |
d211621f |
2341 | static int try_send; |
e5574168 |
2342 | crReturnV; |
d211621f |
2343 | try_send = FALSE; |
7cca0d81 |
2344 | if (ispkt) { |
2345 | if (pktin.type == SSH2_MSG_CHANNEL_DATA || |
2346 | pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA) { |
2347 | char *data; |
2348 | int length; |
d211621f |
2349 | /* FIXME: be able to handle other channels here */ |
2350 | if (ssh2_pkt_getuint32() != mainchan->localid) |
7cca0d81 |
2351 | continue; /* wrong channel */ |
2352 | if (pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA && |
2353 | ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR) |
2354 | continue; /* extended but not stderr */ |
2355 | ssh2_pkt_getstring(&data, &length); |
d211621f |
2356 | if (data) { |
7cca0d81 |
2357 | c_write(data, length); |
d211621f |
2358 | /* |
2359 | * Enlarge the window again at the remote side, |
2360 | * just in case it ever runs down and they fail |
2361 | * to send us any more data. |
2362 | */ |
2363 | ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2364 | ssh2_pkt_adduint32(mainchan->remoteid); |
2365 | ssh2_pkt_adduint32(length); |
2366 | ssh2_pkt_send(); |
2367 | } |
7cca0d81 |
2368 | } else if (pktin.type == SSH2_MSG_DISCONNECT) { |
2369 | ssh_state = SSH_STATE_CLOSED; |
d211621f |
2370 | logevent("Received disconnect message"); |
7cca0d81 |
2371 | } else if (pktin.type == SSH2_MSG_CHANNEL_REQUEST) { |
2372 | continue; /* exit status et al; ignore (FIXME?) */ |
d211621f |
2373 | } else if (pktin.type == SSH2_MSG_CHANNEL_EOF) { |
2374 | continue; /* remote sends EOF; ignore */ |
2375 | } else if (pktin.type == SSH2_MSG_CHANNEL_CLOSE) { |
2376 | /* FIXME: be able to handle other channels here */ |
2377 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2378 | continue; /* wrong channel */ |
2379 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
2380 | ssh2_pkt_adduint32(mainchan->remoteid); |
2381 | ssh2_pkt_send(); |
2382 | /* FIXME: mark the channel as closed */ |
2383 | if (1 /* FIXME: "all channels are closed" */) { |
2384 | logevent("All channels closed. Disconnecting"); |
2385 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
2386 | ssh2_pkt_send(); |
2387 | } |
2388 | continue; /* remote sends close; ignore (FIXME) */ |
7cca0d81 |
2389 | } else if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
d211621f |
2390 | /* FIXME: be able to handle other channels here */ |
2391 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2392 | continue; /* wrong channel */ |
2393 | mainchan->u.v2.remwindow += ssh2_pkt_getuint32(); |
2394 | try_send = TRUE; |
7cca0d81 |
2395 | } else { |
8d5de777 |
2396 | bombout(("Strange packet received: type %d", pktin.type)); |
2397 | crReturnV; |
7cca0d81 |
2398 | } |
2399 | } else { |
d211621f |
2400 | /* |
2401 | * We have spare data. Add it to the channel buffer. |
2402 | */ |
2403 | if (mainchan->u.v2.outbufsize < |
2404 | mainchan->u.v2.outbuflen + inlen) { |
2405 | mainchan->u.v2.outbufsize = |
2406 | mainchan->u.v2.outbuflen + inlen + 1024; |
2407 | mainchan->u.v2.outbuffer = srealloc(mainchan->u.v2.outbuffer, |
2408 | mainchan->u.v2.outbufsize); |
2409 | } |
2410 | memcpy(mainchan->u.v2.outbuffer + mainchan->u.v2.outbuflen, |
2411 | in, inlen); |
2412 | mainchan->u.v2.outbuflen += inlen; |
2413 | try_send = TRUE; |
7cca0d81 |
2414 | } |
d211621f |
2415 | if (try_send) { |
2416 | /* |
2417 | * Try to send data on the channel if we can. (FIXME: |
2418 | * on _all_ channels.) |
2419 | */ |
2420 | while (mainchan->u.v2.remwindow > 0 && |
2421 | mainchan->u.v2.outbuflen > 0) { |
2422 | unsigned len = mainchan->u.v2.remwindow; |
2423 | if (len > mainchan->u.v2.outbuflen) |
2424 | len = mainchan->u.v2.outbuflen; |
2425 | if (len > mainchan->u.v2.remmaxpkt) |
2426 | len = mainchan->u.v2.remmaxpkt; |
2427 | ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA); |
2428 | ssh2_pkt_adduint32(mainchan->remoteid); |
2429 | ssh2_pkt_addstring_start(); |
2430 | ssh2_pkt_addstring_data(mainchan->u.v2.outbuffer, len); |
2431 | ssh2_pkt_send(); |
2432 | mainchan->u.v2.outbuflen -= len; |
2433 | memmove(mainchan->u.v2.outbuffer, mainchan->u.v2.outbuffer+len, |
2434 | mainchan->u.v2.outbuflen); |
2435 | mainchan->u.v2.remwindow -= len; |
2436 | } |
2437 | } |
e5574168 |
2438 | } |
2439 | |
2440 | crFinishV; |
2441 | } |
2442 | |
2443 | /* |
7cca0d81 |
2444 | * Handle the top-level SSH2 protocol. |
2445 | */ |
2446 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt) |
2447 | { |
2448 | if (do_ssh2_transport(in, inlen, ispkt) == 0) |
2449 | return; |
2450 | do_ssh2_authconn(in, inlen, ispkt); |
2451 | } |
2452 | |
2453 | /* |
374330e2 |
2454 | * Called to set up the connection. Will arrange for WM_NETEVENT |
2455 | * messages to be passed to the specified window, whose window |
2456 | * procedure should then call telnet_msg(). |
2457 | * |
2458 | * Returns an error message, or NULL on success. |
374330e2 |
2459 | */ |
2460 | static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) { |
fb09bf1c |
2461 | char *p; |
8f203108 |
2462 | |
2463 | #ifdef MSCRYPTOAPI |
2464 | if(crypto_startup() == 0) |
2465 | return "Microsoft high encryption pack not installed!"; |
2466 | #endif |
374330e2 |
2467 | |
fb09bf1c |
2468 | p = connect_to_host(host, port, realhost); |
2469 | if (p != NULL) |
2470 | return p; |
374330e2 |
2471 | |
2472 | if (!do_ssh_init()) |
2473 | return "Protocol initialisation error"; |
2474 | |
4017be6d |
2475 | if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR) |
374330e2 |
2476 | switch (WSAGetLastError()) { |
2477 | case WSAENETDOWN: return "Network is down"; |
2478 | default: return "WSAAsyncSelect(): unknown error"; |
2479 | } |
2480 | |
2481 | return NULL; |
2482 | } |
2483 | |
2484 | /* |
2485 | * Process a WM_NETEVENT message. Will return 0 if the connection |
2486 | * has closed, or <0 for a socket error. |
2487 | */ |
2488 | static int ssh_msg (WPARAM wParam, LPARAM lParam) { |
2489 | int ret; |
2490 | char buf[256]; |
2491 | |
8ce72d2c |
2492 | /* |
2493 | * Because reading less than the whole of the available pending |
2494 | * data can generate an FD_READ event, we need to allow for the |
2495 | * possibility that FD_READ may arrive with FD_CLOSE already in |
2496 | * the queue; so it's possible that we can get here even with s |
2497 | * invalid. If so, we return 1 and don't worry about it. |
2498 | */ |
2499 | if (s == INVALID_SOCKET) |
2500 | return 1; |
374330e2 |
2501 | |
8d5de777 |
2502 | if (WSAGETSELECTERROR(lParam) != 0) { |
2503 | closesocket(s); |
2504 | s = INVALID_SOCKET; |
374330e2 |
2505 | return -WSAGETSELECTERROR(lParam); |
8d5de777 |
2506 | } |
374330e2 |
2507 | |
2508 | switch (WSAGETSELECTEVENT(lParam)) { |
2509 | case FD_READ: |
8ce72d2c |
2510 | case FD_CLOSE: |
374330e2 |
2511 | ret = recv(s, buf, sizeof(buf), 0); |
2512 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
2513 | return 1; |
8d5de777 |
2514 | if (ret < 0) { /* any _other_ error */ |
2515 | closesocket(s); |
2516 | s = INVALID_SOCKET; |
374330e2 |
2517 | return -10000-WSAGetLastError(); |
8d5de777 |
2518 | } |
374330e2 |
2519 | if (ret == 0) { |
2520 | s = INVALID_SOCKET; |
8ce72d2c |
2521 | return 0; |
374330e2 |
2522 | } |
2523 | ssh_gotdata (buf, ret); |
85ee8208 |
2524 | if (ssh_state == SSH_STATE_CLOSED) { |
2525 | closesocket(s); |
2526 | s = INVALID_SOCKET; |
2527 | return 0; |
2528 | } |
374330e2 |
2529 | return 1; |
374330e2 |
2530 | } |
2531 | return 1; /* shouldn't happen, but WTF */ |
2532 | } |
2533 | |
2534 | /* |
2535 | * Called to send data down the Telnet connection. |
2536 | */ |
2537 | static void ssh_send (char *buf, int len) { |
2538 | if (s == INVALID_SOCKET) |
2539 | return; |
2540 | |
2541 | ssh_protocol(buf, len, 0); |
2542 | } |
2543 | |
2544 | /* |
2545 | * Called to set the size of the window from Telnet's POV. |
2546 | */ |
2547 | static void ssh_size(void) { |
2548 | switch (ssh_state) { |
2549 | case SSH_STATE_BEFORE_SIZE: |
21248260 |
2550 | case SSH_STATE_CLOSED: |
374330e2 |
2551 | break; /* do nothing */ |
2552 | case SSH_STATE_INTERMED: |
2553 | size_needed = TRUE; /* buffer for later */ |
2554 | break; |
2555 | case SSH_STATE_SESSION: |
fef97f43 |
2556 | if (!cfg.nopty) { |
e5574168 |
2557 | send_packet(SSH1_CMSG_WINDOW_SIZE, |
fb09bf1c |
2558 | PKT_INT, rows, PKT_INT, cols, |
2559 | PKT_INT, 0, PKT_INT, 0, PKT_END); |
fef97f43 |
2560 | } |
374330e2 |
2561 | } |
2562 | } |
2563 | |
2564 | /* |
6abbf9e3 |
2565 | * Send Telnet special codes. TS_EOF is useful for `plink', so you |
2566 | * can send an EOF and collect resulting output (e.g. `plink |
2567 | * hostname sort'). |
374330e2 |
2568 | */ |
2569 | static void ssh_special (Telnet_Special code) { |
6abbf9e3 |
2570 | if (code == TS_EOF) { |
67779be7 |
2571 | if (ssh_version == 1) { |
6abbf9e3 |
2572 | send_packet(SSH1_CMSG_EOF, PKT_END); |
2573 | } else { |
2574 | ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF); |
d211621f |
2575 | ssh2_pkt_adduint32(mainchan->remoteid); |
6abbf9e3 |
2576 | ssh2_pkt_send(); |
2577 | } |
67779be7 |
2578 | logevent("Sent EOF message"); |
6abbf9e3 |
2579 | } else { |
2580 | /* do nothing */ |
2581 | } |
374330e2 |
2582 | } |
2583 | |
fb09bf1c |
2584 | |
2585 | /* |
2586 | * Read and decrypt one incoming SSH packet. |
2587 | * (only used by pSCP) |
2588 | */ |
2589 | static void get_packet(void) |
2590 | { |
2591 | unsigned char buf[4096], *p; |
2592 | long to_read; |
2593 | int len; |
2594 | |
fb09bf1c |
2595 | p = NULL; |
2596 | len = 0; |
2597 | |
2598 | while ((to_read = s_rdpkt(&p, &len)) > 0) { |
2599 | if (to_read > sizeof(buf)) to_read = sizeof(buf); |
2600 | len = s_read(buf, to_read); |
2601 | if (len != to_read) { |
2602 | closesocket(s); |
2603 | s = INVALID_SOCKET; |
2604 | return; |
2605 | } |
2606 | p = buf; |
2607 | } |
2608 | |
2609 | assert(len == 0); |
2610 | } |
2611 | |
2612 | /* |
2613 | * Receive a block of data over the SSH link. Block until |
2614 | * all data is available. Return nr of bytes read (0 if lost connection). |
2615 | * (only used by pSCP) |
2616 | */ |
2617 | int ssh_scp_recv(unsigned char *buf, int len) |
2618 | { |
2619 | static int pending_input_len = 0; |
2620 | static unsigned char *pending_input_ptr; |
2621 | int to_read = len; |
2622 | |
fb09bf1c |
2623 | if (pending_input_len >= to_read) { |
2624 | memcpy(buf, pending_input_ptr, to_read); |
2625 | pending_input_ptr += to_read; |
2626 | pending_input_len -= to_read; |
2627 | return len; |
2628 | } |
2629 | |
2630 | if (pending_input_len > 0) { |
2631 | memcpy(buf, pending_input_ptr, pending_input_len); |
2632 | buf += pending_input_len; |
2633 | to_read -= pending_input_len; |
2634 | pending_input_len = 0; |
2635 | } |
2636 | |
2637 | if (s == INVALID_SOCKET) |
2638 | return 0; |
2639 | while (to_read > 0) { |
2640 | get_packet(); |
2641 | if (s == INVALID_SOCKET) |
2642 | return 0; |
e5574168 |
2643 | if (pktin.type == SSH1_SMSG_STDOUT_DATA) { |
fb09bf1c |
2644 | int plen = GET_32BIT(pktin.body); |
2645 | if (plen <= to_read) { |
2646 | memcpy(buf, pktin.body + 4, plen); |
2647 | buf += plen; |
2648 | to_read -= plen; |
2649 | } else { |
2650 | memcpy(buf, pktin.body + 4, to_read); |
2651 | pending_input_len = plen - to_read; |
2652 | pending_input_ptr = pktin.body + 4 + to_read; |
2653 | to_read = 0; |
2654 | } |
e5574168 |
2655 | } else if (pktin.type == SSH1_SMSG_STDERR_DATA) { |
fb09bf1c |
2656 | int plen = GET_32BIT(pktin.body); |
2657 | fwrite(pktin.body + 4, plen, 1, stderr); |
e5574168 |
2658 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
fb09bf1c |
2659 | logevent("Received disconnect request"); |
e5574168 |
2660 | } else if (pktin.type == SSH1_SMSG_SUCCESS || |
2661 | pktin.type == SSH1_SMSG_FAILURE) { |
fb09bf1c |
2662 | /* ignore */ |
e5574168 |
2663 | } else if (pktin.type == SSH1_SMSG_EXIT_STATUS) { |
fb09bf1c |
2664 | char logbuf[100]; |
2665 | sprintf(logbuf, "Remote exit status: %d", GET_32BIT(pktin.body)); |
2666 | logevent(logbuf); |
e5574168 |
2667 | send_packet(SSH1_CMSG_EXIT_CONFIRMATION, PKT_END); |
fb09bf1c |
2668 | logevent("Closing connection"); |
2669 | closesocket(s); |
2670 | s = INVALID_SOCKET; |
2671 | } else { |
8d5de777 |
2672 | bombout(("Strange packet received: type %d", pktin.type)); |
2673 | return 0; |
fb09bf1c |
2674 | } |
2675 | } |
2676 | |
2677 | return len; |
2678 | } |
2679 | |
2680 | /* |
2681 | * Send a block of data over the SSH link. |
2682 | * Block until all data is sent. |
2683 | * (only used by pSCP) |
2684 | */ |
2685 | void ssh_scp_send(unsigned char *buf, int len) |
2686 | { |
fb09bf1c |
2687 | if (s == INVALID_SOCKET) |
2688 | return; |
e5574168 |
2689 | send_packet(SSH1_CMSG_STDIN_DATA, |
fb09bf1c |
2690 | PKT_INT, len, PKT_DATA, buf, len, PKT_END); |
2691 | } |
2692 | |
2693 | /* |
2694 | * Send an EOF notification to the server. |
2695 | * (only used by pSCP) |
2696 | */ |
2697 | void ssh_scp_send_eof(void) |
2698 | { |
fb09bf1c |
2699 | if (s == INVALID_SOCKET) |
2700 | return; |
e5574168 |
2701 | send_packet(SSH1_CMSG_EOF, PKT_END); |
fb09bf1c |
2702 | } |
2703 | |
2704 | /* |
2705 | * Set up the connection, login on the remote host and |
2706 | * start execution of a command. |
2707 | * Returns an error message, or NULL on success. |
2708 | * (only used by pSCP) |
2709 | */ |
2710 | char *ssh_scp_init(char *host, int port, char *cmd, char **realhost) |
2711 | { |
2712 | char buf[160], *p; |
2713 | |
fb09bf1c |
2714 | #ifdef MSCRYPTOAPI |
2715 | if (crypto_startup() == 0) |
2716 | return "Microsoft high encryption pack not installed!"; |
2717 | #endif |
2718 | |
2719 | p = connect_to_host(host, port, realhost); |
2720 | if (p != NULL) |
2721 | return p; |
2722 | |
2723 | random_init(); |
2724 | |
2725 | if (!do_ssh_init()) |
2726 | return "Protocol initialisation error"; |
2727 | |
2728 | /* Exchange keys and login */ |
2729 | do { |
2730 | get_packet(); |
2731 | if (s == INVALID_SOCKET) |
2732 | return "Connection closed by remote host"; |
e5574168 |
2733 | } while (!do_ssh1_login(NULL, 0, 1)); |
85ee8208 |
2734 | |
2735 | if (ssh_state == SSH_STATE_CLOSED) { |
2736 | closesocket(s); |
2737 | s = INVALID_SOCKET; |
2738 | return "Session initialisation error"; |
2739 | } |
fb09bf1c |
2740 | |
2741 | /* Execute command */ |
2742 | sprintf(buf, "Sending command: %.100s", cmd); |
2743 | logevent(buf); |
e5574168 |
2744 | send_packet(SSH1_CMSG_EXEC_CMD, PKT_STR, cmd, PKT_END); |
fb09bf1c |
2745 | |
2746 | return NULL; |
2747 | } |
2748 | |
8ccc75b0 |
2749 | static SOCKET ssh_socket(void) { return s; } |
2750 | |
2751 | static int ssh_sendok(void) { return ssh_send_ok; } |
fb09bf1c |
2752 | |
374330e2 |
2753 | Backend ssh_backend = { |
2754 | ssh_init, |
2755 | ssh_msg, |
2756 | ssh_send, |
2757 | ssh_size, |
4017be6d |
2758 | ssh_special, |
8ccc75b0 |
2759 | ssh_socket, |
2760 | ssh_sendok |
374330e2 |
2761 | }; |