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1853d1ef | 1 | /* |
2 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
3 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
bb0640b2 | 28 | RCSID("$OpenBSD: monitor_wrap.c,v 1.12 2002/06/26 15:00:32 deraadt Exp $"); |
1853d1ef | 29 | |
30 | #include <openssl/bn.h> | |
31 | #include <openssl/dh.h> | |
32 | ||
33 | #include "ssh.h" | |
34 | #include "dh.h" | |
35 | #include "kex.h" | |
36 | #include "auth.h" | |
37 | #include "buffer.h" | |
38 | #include "bufaux.h" | |
39 | #include "packet.h" | |
40 | #include "mac.h" | |
41 | #include "log.h" | |
42 | #include "zlib.h" | |
43 | #include "monitor.h" | |
44 | #include "monitor_wrap.h" | |
45 | #include "xmalloc.h" | |
46 | #include "atomicio.h" | |
47 | #include "monitor_fdpass.h" | |
48 | #include "getput.h" | |
49 | ||
50 | #include "auth.h" | |
51 | #include "channels.h" | |
52 | #include "session.h" | |
53 | ||
54 | /* Imports */ | |
55 | extern int compat20; | |
56 | extern Newkeys *newkeys[]; | |
57 | extern z_stream incoming_stream; | |
58 | extern z_stream outgoing_stream; | |
b5a28cbc | 59 | extern struct monitor *pmonitor; |
1853d1ef | 60 | extern Buffer input, output; |
61 | ||
62 | void | |
63 | mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) | |
64 | { | |
65 | u_char buf[5]; | |
66 | u_int mlen = buffer_len(m); | |
67 | ||
1588c277 | 68 | debug3("%s entering: type %d", __func__, type); |
1853d1ef | 69 | |
70 | PUT_32BIT(buf, mlen + 1); | |
7203d6bb | 71 | buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ |
1853d1ef | 72 | if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf)) |
1588c277 | 73 | fatal("%s: write", __func__); |
1853d1ef | 74 | if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen) |
1588c277 | 75 | fatal("%s: write", __func__); |
1853d1ef | 76 | } |
77 | ||
78 | void | |
79 | mm_request_receive(int socket, Buffer *m) | |
80 | { | |
81 | u_char buf[4]; | |
82 | ssize_t res; | |
83 | u_int msg_len; | |
84 | ||
1588c277 | 85 | debug3("%s entering", __func__); |
1853d1ef | 86 | |
87 | res = atomicio(read, socket, buf, sizeof(buf)); | |
88 | if (res != sizeof(buf)) { | |
89 | if (res == 0) | |
90 | fatal_cleanup(); | |
1588c277 | 91 | fatal("%s: read: %ld", __func__, (long)res); |
1853d1ef | 92 | } |
93 | msg_len = GET_32BIT(buf); | |
94 | if (msg_len > 256 * 1024) | |
1588c277 | 95 | fatal("%s: read: bad msg_len %d", __func__, msg_len); |
1853d1ef | 96 | buffer_clear(m); |
97 | buffer_append_space(m, msg_len); | |
98 | res = atomicio(read, socket, buffer_ptr(m), msg_len); | |
99 | if (res != msg_len) | |
1588c277 | 100 | fatal("%s: read: %ld != msg_len", __func__, (long)res); |
1853d1ef | 101 | } |
102 | ||
103 | void | |
104 | mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m) | |
105 | { | |
106 | u_char rtype; | |
107 | ||
1588c277 | 108 | debug3("%s entering: type %d", __func__, type); |
1853d1ef | 109 | |
110 | mm_request_receive(socket, m); | |
111 | rtype = buffer_get_char(m); | |
112 | if (rtype != type) | |
1588c277 | 113 | fatal("%s: read: rtype %d != type %d", __func__, |
1853d1ef | 114 | rtype, type); |
115 | } | |
116 | ||
117 | DH * | |
118 | mm_choose_dh(int min, int nbits, int max) | |
119 | { | |
120 | BIGNUM *p, *g; | |
121 | int success = 0; | |
122 | Buffer m; | |
123 | ||
124 | buffer_init(&m); | |
125 | buffer_put_int(&m, min); | |
126 | buffer_put_int(&m, nbits); | |
127 | buffer_put_int(&m, max); | |
128 | ||
b5a28cbc | 129 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); |
1853d1ef | 130 | |
1588c277 | 131 | debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); |
b5a28cbc | 132 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); |
1853d1ef | 133 | |
134 | success = buffer_get_char(&m); | |
135 | if (success == 0) | |
1588c277 | 136 | fatal("%s: MONITOR_ANS_MODULI failed", __func__); |
1853d1ef | 137 | |
138 | if ((p = BN_new()) == NULL) | |
1588c277 | 139 | fatal("%s: BN_new failed", __func__); |
1853d1ef | 140 | if ((g = BN_new()) == NULL) |
1588c277 | 141 | fatal("%s: BN_new failed", __func__); |
1853d1ef | 142 | buffer_get_bignum2(&m, p); |
143 | buffer_get_bignum2(&m, g); | |
144 | ||
1588c277 | 145 | debug3("%s: remaining %d", __func__, buffer_len(&m)); |
1853d1ef | 146 | buffer_free(&m); |
147 | ||
148 | return (dh_new_group(g, p)); | |
149 | } | |
150 | ||
151 | int | |
152 | mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) | |
153 | { | |
b5a28cbc | 154 | Kex *kex = *pmonitor->m_pkex; |
1853d1ef | 155 | Buffer m; |
156 | ||
1588c277 | 157 | debug3("%s entering", __func__); |
1853d1ef | 158 | |
159 | buffer_init(&m); | |
160 | buffer_put_int(&m, kex->host_key_index(key)); | |
161 | buffer_put_string(&m, data, datalen); | |
162 | ||
b5a28cbc | 163 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); |
1853d1ef | 164 | |
1588c277 | 165 | debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); |
b5a28cbc | 166 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); |
1853d1ef | 167 | *sigp = buffer_get_string(&m, lenp); |
168 | buffer_free(&m); | |
169 | ||
170 | return (0); | |
171 | } | |
172 | ||
173 | struct passwd * | |
174 | mm_getpwnamallow(const char *login) | |
175 | { | |
176 | Buffer m; | |
177 | struct passwd *pw; | |
178 | u_int pwlen; | |
179 | ||
1588c277 | 180 | debug3("%s entering", __func__); |
1853d1ef | 181 | |
182 | buffer_init(&m); | |
183 | buffer_put_cstring(&m, login); | |
184 | ||
b5a28cbc | 185 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); |
1853d1ef | 186 | |
1588c277 | 187 | debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); |
b5a28cbc | 188 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); |
1853d1ef | 189 | |
190 | if (buffer_get_char(&m) == 0) { | |
191 | buffer_free(&m); | |
192 | return (NULL); | |
193 | } | |
194 | pw = buffer_get_string(&m, &pwlen); | |
195 | if (pwlen != sizeof(struct passwd)) | |
1588c277 | 196 | fatal("%s: struct passwd size mismatch", __func__); |
1853d1ef | 197 | pw->pw_name = buffer_get_string(&m, NULL); |
198 | pw->pw_passwd = buffer_get_string(&m, NULL); | |
199 | pw->pw_gecos = buffer_get_string(&m, NULL); | |
7b18c353 | 200 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 201 | pw->pw_class = buffer_get_string(&m, NULL); |
7b18c353 | 202 | #endif |
1853d1ef | 203 | pw->pw_dir = buffer_get_string(&m, NULL); |
204 | pw->pw_shell = buffer_get_string(&m, NULL); | |
205 | buffer_free(&m); | |
206 | ||
207 | return (pw); | |
208 | } | |
209 | ||
94a73cdc | 210 | char* mm_auth2_read_banner(void) |
211 | { | |
212 | Buffer m; | |
213 | char *banner; | |
214 | ||
1588c277 | 215 | debug3("%s entering", __func__); |
94a73cdc | 216 | |
217 | buffer_init(&m); | |
b5a28cbc | 218 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); |
94a73cdc | 219 | buffer_clear(&m); |
220 | ||
b5a28cbc | 221 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m); |
94a73cdc | 222 | banner = buffer_get_string(&m, NULL); |
223 | buffer_free(&m); | |
7203d6bb | 224 | |
94a73cdc | 225 | return (banner); |
226 | } | |
227 | ||
1853d1ef | 228 | /* Inform the privileged process about service and style */ |
229 | ||
230 | void | |
231 | mm_inform_authserv(char *service, char *style) | |
232 | { | |
233 | Buffer m; | |
234 | ||
1588c277 | 235 | debug3("%s entering", __func__); |
1853d1ef | 236 | |
237 | buffer_init(&m); | |
238 | buffer_put_cstring(&m, service); | |
239 | buffer_put_cstring(&m, style ? style : ""); | |
240 | ||
b5a28cbc | 241 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); |
1853d1ef | 242 | |
243 | buffer_free(&m); | |
244 | } | |
245 | ||
246 | /* Do the password authentication */ | |
247 | int | |
248 | mm_auth_password(Authctxt *authctxt, char *password) | |
249 | { | |
250 | Buffer m; | |
251 | int authenticated = 0; | |
252 | ||
1588c277 | 253 | debug3("%s entering", __func__); |
1853d1ef | 254 | |
255 | buffer_init(&m); | |
256 | buffer_put_cstring(&m, password); | |
b5a28cbc | 257 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); |
1853d1ef | 258 | |
1588c277 | 259 | debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); |
b5a28cbc | 260 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); |
1853d1ef | 261 | |
262 | authenticated = buffer_get_int(&m); | |
263 | ||
264 | buffer_free(&m); | |
265 | ||
266 | debug3("%s: user %sauthenticated", | |
1588c277 | 267 | __func__, authenticated ? "" : "not "); |
1853d1ef | 268 | return (authenticated); |
269 | } | |
270 | ||
271 | int | |
272 | mm_user_key_allowed(struct passwd *pw, Key *key) | |
273 | { | |
274 | return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); | |
275 | } | |
276 | ||
277 | int | |
278 | mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, | |
279 | Key *key) | |
280 | { | |
281 | return (mm_key_allowed(MM_HOSTKEY, user, host, key)); | |
282 | } | |
283 | ||
284 | int | |
285 | mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, | |
286 | char *host, Key *key) | |
287 | { | |
288 | int ret; | |
289 | ||
290 | key->type = KEY_RSA; /* XXX hack for key_to_blob */ | |
291 | ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); | |
292 | key->type = KEY_RSA1; | |
293 | return (ret); | |
294 | } | |
295 | ||
296 | static void | |
297 | mm_send_debug(Buffer *m) | |
298 | { | |
299 | char *msg; | |
300 | ||
301 | while (buffer_len(m)) { | |
302 | msg = buffer_get_string(m, NULL); | |
1588c277 | 303 | debug3("%s: Sending debug: %s", __func__, msg); |
1853d1ef | 304 | packet_send_debug("%s", msg); |
305 | xfree(msg); | |
306 | } | |
307 | } | |
308 | ||
309 | int | |
310 | mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) | |
311 | { | |
312 | Buffer m; | |
313 | u_char *blob; | |
314 | u_int len; | |
315 | int allowed = 0; | |
316 | ||
1588c277 | 317 | debug3("%s entering", __func__); |
1853d1ef | 318 | |
319 | /* Convert the key to a blob and the pass it over */ | |
320 | if (!key_to_blob(key, &blob, &len)) | |
321 | return (0); | |
322 | ||
323 | buffer_init(&m); | |
324 | buffer_put_int(&m, type); | |
325 | buffer_put_cstring(&m, user ? user : ""); | |
326 | buffer_put_cstring(&m, host ? host : ""); | |
327 | buffer_put_string(&m, blob, len); | |
328 | xfree(blob); | |
329 | ||
b5a28cbc | 330 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); |
1853d1ef | 331 | |
1588c277 | 332 | debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); |
b5a28cbc | 333 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); |
1853d1ef | 334 | |
335 | allowed = buffer_get_int(&m); | |
336 | ||
337 | /* Send potential debug messages */ | |
338 | mm_send_debug(&m); | |
339 | ||
340 | buffer_free(&m); | |
341 | ||
342 | return (allowed); | |
343 | } | |
344 | ||
345 | /* | |
346 | * This key verify needs to send the key type along, because the | |
347 | * privileged parent makes the decision if the key is allowed | |
348 | * for authentication. | |
349 | */ | |
350 | ||
351 | int | |
352 | mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) | |
353 | { | |
354 | Buffer m; | |
355 | u_char *blob; | |
356 | u_int len; | |
357 | int verified = 0; | |
358 | ||
1588c277 | 359 | debug3("%s entering", __func__); |
1853d1ef | 360 | |
361 | /* Convert the key to a blob and the pass it over */ | |
362 | if (!key_to_blob(key, &blob, &len)) | |
363 | return (0); | |
364 | ||
365 | buffer_init(&m); | |
366 | buffer_put_string(&m, blob, len); | |
367 | buffer_put_string(&m, sig, siglen); | |
368 | buffer_put_string(&m, data, datalen); | |
369 | xfree(blob); | |
370 | ||
b5a28cbc | 371 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); |
1853d1ef | 372 | |
1588c277 | 373 | debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); |
b5a28cbc | 374 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); |
1853d1ef | 375 | |
376 | verified = buffer_get_int(&m); | |
377 | ||
378 | buffer_free(&m); | |
379 | ||
380 | return (verified); | |
381 | } | |
382 | ||
383 | /* Export key state after authentication */ | |
384 | Newkeys * | |
385 | mm_newkeys_from_blob(u_char *blob, int blen) | |
386 | { | |
387 | Buffer b; | |
388 | u_int len; | |
389 | Newkeys *newkey = NULL; | |
390 | Enc *enc; | |
391 | Mac *mac; | |
392 | Comp *comp; | |
393 | ||
1588c277 | 394 | debug3("%s: %p(%d)", __func__, blob, blen); |
1853d1ef | 395 | #ifdef DEBUG_PK |
396 | dump_base64(stderr, blob, blen); | |
397 | #endif | |
398 | buffer_init(&b); | |
399 | buffer_append(&b, blob, blen); | |
400 | ||
401 | newkey = xmalloc(sizeof(*newkey)); | |
402 | enc = &newkey->enc; | |
403 | mac = &newkey->mac; | |
404 | comp = &newkey->comp; | |
405 | ||
406 | /* Enc structure */ | |
407 | enc->name = buffer_get_string(&b, NULL); | |
408 | buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); | |
409 | enc->enabled = buffer_get_int(&b); | |
410 | enc->block_size = buffer_get_int(&b); | |
411 | enc->key = buffer_get_string(&b, &enc->key_len); | |
412 | enc->iv = buffer_get_string(&b, &len); | |
413 | if (len != enc->block_size) | |
bb0640b2 | 414 | fatal("%s: bad ivlen: expected %u != %u", __func__, |
1853d1ef | 415 | enc->block_size, len); |
416 | ||
417 | if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) | |
1588c277 | 418 | fatal("%s: bad cipher name %s or pointer %p", __func__, |
1853d1ef | 419 | enc->name, enc->cipher); |
420 | ||
421 | /* Mac structure */ | |
422 | mac->name = buffer_get_string(&b, NULL); | |
423 | if (mac->name == NULL || mac_init(mac, mac->name) == -1) | |
1588c277 | 424 | fatal("%s: can not init mac %s", __func__, mac->name); |
1853d1ef | 425 | mac->enabled = buffer_get_int(&b); |
426 | mac->key = buffer_get_string(&b, &len); | |
427 | if (len > mac->key_len) | |
bb0640b2 | 428 | fatal("%s: bad mac key length: %u > %d", __func__, len, |
1853d1ef | 429 | mac->key_len); |
430 | mac->key_len = len; | |
431 | ||
432 | /* Comp structure */ | |
433 | comp->type = buffer_get_int(&b); | |
434 | comp->enabled = buffer_get_int(&b); | |
435 | comp->name = buffer_get_string(&b, NULL); | |
436 | ||
437 | len = buffer_len(&b); | |
438 | if (len != 0) | |
bb0640b2 | 439 | error("newkeys_from_blob: remaining bytes in blob %u", len); |
1853d1ef | 440 | buffer_free(&b); |
441 | return (newkey); | |
442 | } | |
443 | ||
444 | int | |
445 | mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) | |
446 | { | |
447 | Buffer b; | |
448 | int len; | |
449 | u_char *buf; | |
450 | Enc *enc; | |
451 | Mac *mac; | |
452 | Comp *comp; | |
453 | Newkeys *newkey = newkeys[mode]; | |
454 | ||
1588c277 | 455 | debug3("%s: converting %p", __func__, newkey); |
1853d1ef | 456 | |
457 | if (newkey == NULL) { | |
1588c277 | 458 | error("%s: newkey == NULL", __func__); |
1853d1ef | 459 | return 0; |
460 | } | |
461 | enc = &newkey->enc; | |
462 | mac = &newkey->mac; | |
463 | comp = &newkey->comp; | |
464 | ||
465 | buffer_init(&b); | |
466 | /* Enc structure */ | |
467 | buffer_put_cstring(&b, enc->name); | |
468 | /* The cipher struct is constant and shared, you export pointer */ | |
469 | buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); | |
470 | buffer_put_int(&b, enc->enabled); | |
471 | buffer_put_int(&b, enc->block_size); | |
472 | buffer_put_string(&b, enc->key, enc->key_len); | |
473 | packet_get_keyiv(mode, enc->iv, enc->block_size); | |
474 | buffer_put_string(&b, enc->iv, enc->block_size); | |
475 | ||
476 | /* Mac structure */ | |
477 | buffer_put_cstring(&b, mac->name); | |
478 | buffer_put_int(&b, mac->enabled); | |
479 | buffer_put_string(&b, mac->key, mac->key_len); | |
480 | ||
481 | /* Comp structure */ | |
482 | buffer_put_int(&b, comp->type); | |
483 | buffer_put_int(&b, comp->enabled); | |
484 | buffer_put_cstring(&b, comp->name); | |
485 | ||
486 | len = buffer_len(&b); | |
487 | buf = xmalloc(len); | |
488 | memcpy(buf, buffer_ptr(&b), len); | |
489 | memset(buffer_ptr(&b), 0, len); | |
490 | buffer_free(&b); | |
491 | if (lenp != NULL) | |
492 | *lenp = len; | |
493 | if (blobp != NULL) | |
494 | *blobp = buf; | |
495 | return len; | |
496 | } | |
497 | ||
498 | static void | |
499 | mm_send_kex(Buffer *m, Kex *kex) | |
500 | { | |
501 | buffer_put_string(m, kex->session_id, kex->session_id_len); | |
502 | buffer_put_int(m, kex->we_need); | |
503 | buffer_put_int(m, kex->hostkey_type); | |
504 | buffer_put_int(m, kex->kex_type); | |
505 | buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); | |
506 | buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); | |
507 | buffer_put_int(m, kex->flags); | |
508 | buffer_put_cstring(m, kex->client_version_string); | |
509 | buffer_put_cstring(m, kex->server_version_string); | |
510 | } | |
511 | ||
512 | void | |
b5a28cbc | 513 | mm_send_keystate(struct monitor *pmonitor) |
1853d1ef | 514 | { |
515 | Buffer m; | |
516 | u_char *blob, *p; | |
517 | u_int bloblen, plen; | |
518 | ||
519 | buffer_init(&m); | |
520 | ||
521 | if (!compat20) { | |
522 | u_char iv[24]; | |
9459414c | 523 | u_char *key; |
524 | u_int ivlen, keylen; | |
1853d1ef | 525 | |
526 | buffer_put_int(&m, packet_get_protocol_flags()); | |
527 | ||
528 | buffer_put_int(&m, packet_get_ssh1_cipher()); | |
529 | ||
9459414c | 530 | debug3("%s: Sending ssh1 KEY+IV", __func__); |
531 | keylen = packet_get_encryption_key(NULL); | |
532 | key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ | |
533 | keylen = packet_get_encryption_key(key); | |
534 | buffer_put_string(&m, key, keylen); | |
535 | memset(key, 0, keylen); | |
536 | xfree(key); | |
537 | ||
1853d1ef | 538 | ivlen = packet_get_keyiv_len(MODE_OUT); |
539 | packet_get_keyiv(MODE_OUT, iv, ivlen); | |
540 | buffer_put_string(&m, iv, ivlen); | |
541 | ivlen = packet_get_keyiv_len(MODE_OUT); | |
542 | packet_get_keyiv(MODE_IN, iv, ivlen); | |
543 | buffer_put_string(&m, iv, ivlen); | |
544 | goto skip; | |
545 | } else { | |
546 | /* Kex for rekeying */ | |
b5a28cbc | 547 | mm_send_kex(&m, *pmonitor->m_pkex); |
1853d1ef | 548 | } |
549 | ||
550 | debug3("%s: Sending new keys: %p %p", | |
1588c277 | 551 | __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); |
1853d1ef | 552 | |
553 | /* Keys from Kex */ | |
554 | if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) | |
1588c277 | 555 | fatal("%s: conversion of newkeys failed", __func__); |
1853d1ef | 556 | |
557 | buffer_put_string(&m, blob, bloblen); | |
558 | xfree(blob); | |
559 | ||
560 | if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) | |
1588c277 | 561 | fatal("%s: conversion of newkeys failed", __func__); |
1853d1ef | 562 | |
563 | buffer_put_string(&m, blob, bloblen); | |
564 | xfree(blob); | |
565 | ||
566 | buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); | |
567 | buffer_put_int(&m, packet_get_seqnr(MODE_IN)); | |
568 | ||
1588c277 | 569 | debug3("%s: New keys have been sent", __func__); |
1853d1ef | 570 | skip: |
571 | /* More key context */ | |
572 | plen = packet_get_keycontext(MODE_OUT, NULL); | |
573 | p = xmalloc(plen+1); | |
574 | packet_get_keycontext(MODE_OUT, p); | |
575 | buffer_put_string(&m, p, plen); | |
576 | xfree(p); | |
577 | ||
578 | plen = packet_get_keycontext(MODE_IN, NULL); | |
579 | p = xmalloc(plen+1); | |
580 | packet_get_keycontext(MODE_IN, p); | |
581 | buffer_put_string(&m, p, plen); | |
582 | xfree(p); | |
583 | ||
584 | /* Compression state */ | |
1588c277 | 585 | debug3("%s: Sending compression state", __func__); |
1853d1ef | 586 | buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); |
587 | buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); | |
588 | ||
589 | /* Network I/O buffers */ | |
590 | buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); | |
591 | buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); | |
592 | ||
b5a28cbc | 593 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); |
1588c277 | 594 | debug3("%s: Finished sending state", __func__); |
1853d1ef | 595 | |
596 | buffer_free(&m); | |
597 | } | |
598 | ||
599 | int | |
600 | mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) | |
601 | { | |
602 | Buffer m; | |
603 | u_char *p; | |
604 | int success = 0; | |
605 | ||
606 | buffer_init(&m); | |
b5a28cbc | 607 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); |
1853d1ef | 608 | |
1588c277 | 609 | debug3("%s: waiting for MONITOR_ANS_PTY", __func__); |
b5a28cbc | 610 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); |
1853d1ef | 611 | |
612 | success = buffer_get_int(&m); | |
613 | if (success == 0) { | |
1588c277 | 614 | debug3("%s: pty alloc failed", __func__); |
1853d1ef | 615 | buffer_free(&m); |
616 | return (0); | |
617 | } | |
618 | p = buffer_get_string(&m, NULL); | |
619 | buffer_free(&m); | |
620 | ||
621 | strlcpy(namebuf, p, namebuflen); /* Possible truncation */ | |
622 | xfree(p); | |
623 | ||
b5a28cbc | 624 | *ptyfd = mm_receive_fd(pmonitor->m_recvfd); |
625 | *ttyfd = mm_receive_fd(pmonitor->m_recvfd); | |
1853d1ef | 626 | |
627 | /* Success */ | |
628 | return (1); | |
629 | } | |
630 | ||
631 | void | |
632 | mm_session_pty_cleanup2(void *session) | |
633 | { | |
634 | Session *s = session; | |
635 | Buffer m; | |
636 | ||
637 | if (s->ttyfd == -1) | |
638 | return; | |
639 | buffer_init(&m); | |
640 | buffer_put_cstring(&m, s->tty); | |
b5a28cbc | 641 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); |
1853d1ef | 642 | buffer_free(&m); |
643 | ||
644 | /* closed dup'ed master */ | |
645 | if (close(s->ptymaster) < 0) | |
646 | error("close(s->ptymaster): %s", strerror(errno)); | |
647 | ||
648 | /* unlink pty from session */ | |
649 | s->ttyfd = -1; | |
650 | } | |
651 | ||
ad200abb | 652 | #ifdef USE_PAM |
653 | void | |
654 | mm_start_pam(char *user) | |
655 | { | |
656 | Buffer m; | |
657 | ||
1588c277 | 658 | debug3("%s entering", __func__); |
ad200abb | 659 | |
660 | buffer_init(&m); | |
661 | buffer_put_cstring(&m, user); | |
662 | ||
b5a28cbc | 663 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); |
ad200abb | 664 | |
665 | buffer_free(&m); | |
666 | } | |
667 | #endif /* USE_PAM */ | |
668 | ||
1853d1ef | 669 | /* Request process termination */ |
670 | ||
671 | void | |
672 | mm_terminate(void) | |
673 | { | |
674 | Buffer m; | |
675 | ||
676 | buffer_init(&m); | |
b5a28cbc | 677 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); |
1853d1ef | 678 | buffer_free(&m); |
679 | } | |
680 | ||
681 | int | |
682 | mm_ssh1_session_key(BIGNUM *num) | |
683 | { | |
684 | int rsafail; | |
685 | Buffer m; | |
686 | ||
687 | buffer_init(&m); | |
688 | buffer_put_bignum2(&m, num); | |
b5a28cbc | 689 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); |
1853d1ef | 690 | |
b5a28cbc | 691 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); |
1853d1ef | 692 | |
693 | rsafail = buffer_get_int(&m); | |
694 | buffer_get_bignum2(&m, num); | |
695 | ||
696 | buffer_free(&m); | |
697 | ||
698 | return (rsafail); | |
699 | } | |
700 | ||
701 | static void | |
702 | mm_chall_setup(char **name, char **infotxt, u_int *numprompts, | |
703 | char ***prompts, u_int **echo_on) | |
704 | { | |
7203d6bb | 705 | *name = xstrdup(""); |
706 | *infotxt = xstrdup(""); | |
1853d1ef | 707 | *numprompts = 1; |
708 | *prompts = xmalloc(*numprompts * sizeof(char*)); | |
709 | *echo_on = xmalloc(*numprompts * sizeof(u_int)); | |
710 | (*echo_on)[0] = 0; | |
711 | } | |
712 | ||
713 | int | |
714 | mm_bsdauth_query(void *ctx, char **name, char **infotxt, | |
715 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
716 | { | |
717 | Buffer m; | |
718 | int res; | |
719 | char *challenge; | |
720 | ||
1588c277 | 721 | debug3("%s: entering", __func__); |
1853d1ef | 722 | |
723 | buffer_init(&m); | |
b5a28cbc | 724 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); |
1853d1ef | 725 | |
b5a28cbc | 726 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, |
1853d1ef | 727 | &m); |
728 | res = buffer_get_int(&m); | |
729 | if (res == -1) { | |
1588c277 | 730 | debug3("%s: no challenge", __func__); |
1853d1ef | 731 | buffer_free(&m); |
732 | return (-1); | |
733 | } | |
734 | ||
735 | /* Get the challenge, and format the response */ | |
736 | challenge = buffer_get_string(&m, NULL); | |
737 | buffer_free(&m); | |
738 | ||
739 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
740 | (*prompts)[0] = challenge; | |
741 | ||
1588c277 | 742 | debug3("%s: received challenge: %s", __func__, challenge); |
1853d1ef | 743 | |
744 | return (0); | |
745 | } | |
746 | ||
747 | int | |
748 | mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) | |
749 | { | |
750 | Buffer m; | |
751 | int authok; | |
752 | ||
1588c277 | 753 | debug3("%s: entering", __func__); |
1853d1ef | 754 | if (numresponses != 1) |
755 | return (-1); | |
756 | ||
757 | buffer_init(&m); | |
758 | buffer_put_cstring(&m, responses[0]); | |
b5a28cbc | 759 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); |
1853d1ef | 760 | |
b5a28cbc | 761 | mm_request_receive_expect(pmonitor->m_recvfd, |
1853d1ef | 762 | MONITOR_ANS_BSDAUTHRESPOND, &m); |
763 | ||
764 | authok = buffer_get_int(&m); | |
765 | buffer_free(&m); | |
766 | ||
767 | return ((authok == 0) ? -1 : 0); | |
768 | } | |
769 | ||
770 | int | |
771 | mm_skey_query(void *ctx, char **name, char **infotxt, | |
772 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
773 | { | |
774 | Buffer m; | |
775 | int len, res; | |
776 | char *p, *challenge; | |
777 | ||
1588c277 | 778 | debug3("%s: entering", __func__); |
1853d1ef | 779 | |
780 | buffer_init(&m); | |
b5a28cbc | 781 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); |
1853d1ef | 782 | |
b5a28cbc | 783 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, |
1853d1ef | 784 | &m); |
785 | res = buffer_get_int(&m); | |
786 | if (res == -1) { | |
1588c277 | 787 | debug3("%s: no challenge", __func__); |
1853d1ef | 788 | buffer_free(&m); |
789 | return (-1); | |
790 | } | |
791 | ||
792 | /* Get the challenge, and format the response */ | |
793 | challenge = buffer_get_string(&m, NULL); | |
794 | buffer_free(&m); | |
795 | ||
1588c277 | 796 | debug3("%s: received challenge: %s", __func__, challenge); |
1853d1ef | 797 | |
798 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
799 | ||
800 | len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; | |
801 | p = xmalloc(len); | |
802 | strlcpy(p, challenge, len); | |
803 | strlcat(p, SKEY_PROMPT, len); | |
804 | (*prompts)[0] = p; | |
805 | xfree(challenge); | |
806 | ||
807 | return (0); | |
808 | } | |
809 | ||
810 | int | |
811 | mm_skey_respond(void *ctx, u_int numresponses, char **responses) | |
812 | { | |
813 | Buffer m; | |
814 | int authok; | |
815 | ||
1588c277 | 816 | debug3("%s: entering", __func__); |
1853d1ef | 817 | if (numresponses != 1) |
818 | return (-1); | |
819 | ||
820 | buffer_init(&m); | |
821 | buffer_put_cstring(&m, responses[0]); | |
b5a28cbc | 822 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); |
1853d1ef | 823 | |
b5a28cbc | 824 | mm_request_receive_expect(pmonitor->m_recvfd, |
1853d1ef | 825 | MONITOR_ANS_SKEYRESPOND, &m); |
826 | ||
827 | authok = buffer_get_int(&m); | |
828 | buffer_free(&m); | |
829 | ||
830 | return ((authok == 0) ? -1 : 0); | |
831 | } | |
832 | ||
833 | void | |
834 | mm_ssh1_session_id(u_char session_id[16]) | |
835 | { | |
836 | Buffer m; | |
837 | int i; | |
838 | ||
1588c277 | 839 | debug3("%s entering", __func__); |
1853d1ef | 840 | |
841 | buffer_init(&m); | |
842 | for (i = 0; i < 16; i++) | |
843 | buffer_put_char(&m, session_id[i]); | |
844 | ||
b5a28cbc | 845 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); |
1853d1ef | 846 | buffer_free(&m); |
847 | } | |
848 | ||
849 | int | |
850 | mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) | |
851 | { | |
852 | Buffer m; | |
853 | Key *key; | |
854 | u_char *blob; | |
855 | u_int blen; | |
856 | int allowed = 0; | |
857 | ||
1588c277 | 858 | debug3("%s entering", __func__); |
1853d1ef | 859 | |
860 | buffer_init(&m); | |
861 | buffer_put_bignum2(&m, client_n); | |
862 | ||
b5a28cbc | 863 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); |
864 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); | |
1853d1ef | 865 | |
866 | allowed = buffer_get_int(&m); | |
867 | ||
868 | if (allowed && rkey != NULL) { | |
869 | blob = buffer_get_string(&m, &blen); | |
870 | if ((key = key_from_blob(blob, blen)) == NULL) | |
1588c277 | 871 | fatal("%s: key_from_blob failed", __func__); |
1853d1ef | 872 | *rkey = key; |
873 | xfree(blob); | |
874 | } | |
875 | mm_send_debug(&m); | |
876 | buffer_free(&m); | |
877 | ||
878 | return (allowed); | |
879 | } | |
880 | ||
881 | BIGNUM * | |
882 | mm_auth_rsa_generate_challenge(Key *key) | |
883 | { | |
884 | Buffer m; | |
885 | BIGNUM *challenge; | |
886 | u_char *blob; | |
887 | u_int blen; | |
888 | ||
1588c277 | 889 | debug3("%s entering", __func__); |
1853d1ef | 890 | |
891 | if ((challenge = BN_new()) == NULL) | |
1588c277 | 892 | fatal("%s: BN_new failed", __func__); |
1853d1ef | 893 | |
894 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
895 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 896 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 897 | key->type = KEY_RSA1; |
898 | ||
899 | buffer_init(&m); | |
900 | buffer_put_string(&m, blob, blen); | |
901 | xfree(blob); | |
902 | ||
b5a28cbc | 903 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); |
904 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); | |
1853d1ef | 905 | |
906 | buffer_get_bignum2(&m, challenge); | |
907 | buffer_free(&m); | |
908 | ||
909 | return (challenge); | |
910 | } | |
911 | ||
912 | int | |
913 | mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) | |
914 | { | |
915 | Buffer m; | |
916 | u_char *blob; | |
917 | u_int blen; | |
918 | int success = 0; | |
919 | ||
1588c277 | 920 | debug3("%s entering", __func__); |
1853d1ef | 921 | |
922 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
923 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 924 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 925 | key->type = KEY_RSA1; |
926 | ||
927 | buffer_init(&m); | |
928 | buffer_put_string(&m, blob, blen); | |
929 | buffer_put_string(&m, response, 16); | |
930 | xfree(blob); | |
931 | ||
b5a28cbc | 932 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); |
933 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); | |
1853d1ef | 934 | |
935 | success = buffer_get_int(&m); | |
936 | buffer_free(&m); | |
937 | ||
938 | return (success); | |
939 | } |