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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" | |
3074b20c | 28 | RCSID("$OpenBSD: monitor_wrap.c,v 1.5 2002/03/25 20:12:10 stevesk 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; | |
59 | extern struct monitor *monitor; | |
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 | ||
68 | debug3("%s entering: type %d", __FUNCTION__, type); | |
69 | ||
70 | PUT_32BIT(buf, mlen + 1); | |
71 | buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ | |
72 | if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf)) | |
73 | fatal("%s: write", __FUNCTION__); | |
74 | if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen) | |
75 | fatal("%s: write", __FUNCTION__); | |
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 | ||
85 | debug3("%s entering", __FUNCTION__); | |
86 | ||
87 | res = atomicio(read, socket, buf, sizeof(buf)); | |
88 | if (res != sizeof(buf)) { | |
89 | if (res == 0) | |
90 | fatal_cleanup(); | |
3074b20c | 91 | fatal("%s: read: %ld", __FUNCTION__, (long)res); |
1853d1ef | 92 | } |
93 | msg_len = GET_32BIT(buf); | |
94 | if (msg_len > 256 * 1024) | |
95 | fatal("%s: read: bad msg_len %d", __FUNCTION__, msg_len); | |
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) | |
3074b20c | 100 | fatal("%s: read: %ld != msg_len", __FUNCTION__, (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 | ||
108 | debug3("%s entering: type %d", __FUNCTION__, type); | |
109 | ||
110 | mm_request_receive(socket, m); | |
111 | rtype = buffer_get_char(m); | |
112 | if (rtype != type) | |
113 | fatal("%s: read: rtype %d != type %d", __FUNCTION__, | |
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 | ||
129 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_MODULI, &m); | |
130 | ||
131 | debug3("%s: waiting for MONITOR_ANS_MODULI", __FUNCTION__); | |
132 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_MODULI, &m); | |
133 | ||
134 | success = buffer_get_char(&m); | |
135 | if (success == 0) | |
136 | fatal("%s: MONITOR_ANS_MODULI failed", __FUNCTION__); | |
137 | ||
138 | if ((p = BN_new()) == NULL) | |
139 | fatal("%s: BN_new failed", __FUNCTION__); | |
140 | if ((g = BN_new()) == NULL) | |
141 | fatal("%s: BN_new failed", __FUNCTION__); | |
142 | buffer_get_bignum2(&m, p); | |
143 | buffer_get_bignum2(&m, g); | |
144 | ||
145 | debug3("%s: remaining %d", __FUNCTION__, buffer_len(&m)); | |
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 | { | |
154 | Kex *kex = *monitor->m_pkex; | |
155 | Buffer m; | |
156 | ||
157 | debug3("%s entering", __FUNCTION__); | |
158 | ||
159 | buffer_init(&m); | |
160 | buffer_put_int(&m, kex->host_key_index(key)); | |
161 | buffer_put_string(&m, data, datalen); | |
162 | ||
163 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_SIGN, &m); | |
164 | ||
165 | debug3("%s: waiting for MONITOR_ANS_SIGN", __FUNCTION__); | |
166 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_SIGN, &m); | |
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 | ||
180 | debug3("%s entering", __FUNCTION__); | |
181 | ||
182 | buffer_init(&m); | |
183 | buffer_put_cstring(&m, login); | |
184 | ||
185 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_PWNAM, &m); | |
186 | ||
187 | debug3("%s: waiting for MONITOR_ANS_PWNAM", __FUNCTION__); | |
188 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_PWNAM, &m); | |
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)) | |
196 | fatal("%s: struct passwd size mismatch", __FUNCTION__); | |
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 | ||
210 | /* Inform the privileged process about service and style */ | |
211 | ||
212 | void | |
213 | mm_inform_authserv(char *service, char *style) | |
214 | { | |
215 | Buffer m; | |
216 | ||
217 | debug3("%s entering", __FUNCTION__); | |
218 | ||
219 | buffer_init(&m); | |
220 | buffer_put_cstring(&m, service); | |
221 | buffer_put_cstring(&m, style ? style : ""); | |
222 | ||
223 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); | |
224 | ||
225 | buffer_free(&m); | |
226 | } | |
227 | ||
228 | /* Do the password authentication */ | |
229 | int | |
230 | mm_auth_password(Authctxt *authctxt, char *password) | |
231 | { | |
232 | Buffer m; | |
233 | int authenticated = 0; | |
234 | ||
235 | debug3("%s entering", __FUNCTION__); | |
236 | ||
237 | buffer_init(&m); | |
238 | buffer_put_cstring(&m, password); | |
239 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); | |
240 | ||
241 | debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __FUNCTION__); | |
242 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); | |
243 | ||
244 | authenticated = buffer_get_int(&m); | |
245 | ||
246 | buffer_free(&m); | |
247 | ||
248 | debug3("%s: user %sauthenticated", | |
249 | __FUNCTION__, authenticated ? "" : "not "); | |
250 | return (authenticated); | |
251 | } | |
252 | ||
253 | int | |
254 | mm_user_key_allowed(struct passwd *pw, Key *key) | |
255 | { | |
256 | return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); | |
257 | } | |
258 | ||
259 | int | |
260 | mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, | |
261 | Key *key) | |
262 | { | |
263 | return (mm_key_allowed(MM_HOSTKEY, user, host, key)); | |
264 | } | |
265 | ||
266 | int | |
267 | mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, | |
268 | char *host, Key *key) | |
269 | { | |
270 | int ret; | |
271 | ||
272 | key->type = KEY_RSA; /* XXX hack for key_to_blob */ | |
273 | ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); | |
274 | key->type = KEY_RSA1; | |
275 | return (ret); | |
276 | } | |
277 | ||
278 | static void | |
279 | mm_send_debug(Buffer *m) | |
280 | { | |
281 | char *msg; | |
282 | ||
283 | while (buffer_len(m)) { | |
284 | msg = buffer_get_string(m, NULL); | |
285 | debug3("%s: Sending debug: %s", __FUNCTION__, msg); | |
286 | packet_send_debug("%s", msg); | |
287 | xfree(msg); | |
288 | } | |
289 | } | |
290 | ||
291 | int | |
292 | mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) | |
293 | { | |
294 | Buffer m; | |
295 | u_char *blob; | |
296 | u_int len; | |
297 | int allowed = 0; | |
298 | ||
299 | debug3("%s entering", __FUNCTION__); | |
300 | ||
301 | /* Convert the key to a blob and the pass it over */ | |
302 | if (!key_to_blob(key, &blob, &len)) | |
303 | return (0); | |
304 | ||
305 | buffer_init(&m); | |
306 | buffer_put_int(&m, type); | |
307 | buffer_put_cstring(&m, user ? user : ""); | |
308 | buffer_put_cstring(&m, host ? host : ""); | |
309 | buffer_put_string(&m, blob, len); | |
310 | xfree(blob); | |
311 | ||
312 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); | |
313 | ||
314 | debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __FUNCTION__); | |
315 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); | |
316 | ||
317 | allowed = buffer_get_int(&m); | |
318 | ||
319 | /* Send potential debug messages */ | |
320 | mm_send_debug(&m); | |
321 | ||
322 | buffer_free(&m); | |
323 | ||
324 | return (allowed); | |
325 | } | |
326 | ||
327 | /* | |
328 | * This key verify needs to send the key type along, because the | |
329 | * privileged parent makes the decision if the key is allowed | |
330 | * for authentication. | |
331 | */ | |
332 | ||
333 | int | |
334 | mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) | |
335 | { | |
336 | Buffer m; | |
337 | u_char *blob; | |
338 | u_int len; | |
339 | int verified = 0; | |
340 | ||
341 | debug3("%s entering", __FUNCTION__); | |
342 | ||
343 | /* Convert the key to a blob and the pass it over */ | |
344 | if (!key_to_blob(key, &blob, &len)) | |
345 | return (0); | |
346 | ||
347 | buffer_init(&m); | |
348 | buffer_put_string(&m, blob, len); | |
349 | buffer_put_string(&m, sig, siglen); | |
350 | buffer_put_string(&m, data, datalen); | |
351 | xfree(blob); | |
352 | ||
353 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); | |
354 | ||
355 | debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __FUNCTION__); | |
356 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); | |
357 | ||
358 | verified = buffer_get_int(&m); | |
359 | ||
360 | buffer_free(&m); | |
361 | ||
362 | return (verified); | |
363 | } | |
364 | ||
365 | /* Export key state after authentication */ | |
366 | Newkeys * | |
367 | mm_newkeys_from_blob(u_char *blob, int blen) | |
368 | { | |
369 | Buffer b; | |
370 | u_int len; | |
371 | Newkeys *newkey = NULL; | |
372 | Enc *enc; | |
373 | Mac *mac; | |
374 | Comp *comp; | |
375 | ||
376 | debug3("%s: %p(%d)", __FUNCTION__, blob, blen); | |
377 | #ifdef DEBUG_PK | |
378 | dump_base64(stderr, blob, blen); | |
379 | #endif | |
380 | buffer_init(&b); | |
381 | buffer_append(&b, blob, blen); | |
382 | ||
383 | newkey = xmalloc(sizeof(*newkey)); | |
384 | enc = &newkey->enc; | |
385 | mac = &newkey->mac; | |
386 | comp = &newkey->comp; | |
387 | ||
388 | /* Enc structure */ | |
389 | enc->name = buffer_get_string(&b, NULL); | |
390 | buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); | |
391 | enc->enabled = buffer_get_int(&b); | |
392 | enc->block_size = buffer_get_int(&b); | |
393 | enc->key = buffer_get_string(&b, &enc->key_len); | |
394 | enc->iv = buffer_get_string(&b, &len); | |
395 | if (len != enc->block_size) | |
396 | fatal("%s: bad ivlen: expected %d != %d", __FUNCTION__, | |
397 | enc->block_size, len); | |
398 | ||
399 | if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) | |
400 | fatal("%s: bad cipher name %s or pointer %p", __FUNCTION__, | |
401 | enc->name, enc->cipher); | |
402 | ||
403 | /* Mac structure */ | |
404 | mac->name = buffer_get_string(&b, NULL); | |
405 | if (mac->name == NULL || mac_init(mac, mac->name) == -1) | |
406 | fatal("%s: can not init mac %s", __FUNCTION__, mac->name); | |
407 | mac->enabled = buffer_get_int(&b); | |
408 | mac->key = buffer_get_string(&b, &len); | |
409 | if (len > mac->key_len) | |
410 | fatal("%s: bad mac key lenght: %d > %d", __FUNCTION__, len, | |
411 | mac->key_len); | |
412 | mac->key_len = len; | |
413 | ||
414 | /* Comp structure */ | |
415 | comp->type = buffer_get_int(&b); | |
416 | comp->enabled = buffer_get_int(&b); | |
417 | comp->name = buffer_get_string(&b, NULL); | |
418 | ||
419 | len = buffer_len(&b); | |
420 | if (len != 0) | |
421 | error("newkeys_from_blob: remaining bytes in blob %d", len); | |
422 | buffer_free(&b); | |
423 | return (newkey); | |
424 | } | |
425 | ||
426 | int | |
427 | mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) | |
428 | { | |
429 | Buffer b; | |
430 | int len; | |
431 | u_char *buf; | |
432 | Enc *enc; | |
433 | Mac *mac; | |
434 | Comp *comp; | |
435 | Newkeys *newkey = newkeys[mode]; | |
436 | ||
437 | debug3("%s: converting %p", __FUNCTION__, newkey); | |
438 | ||
439 | if (newkey == NULL) { | |
440 | error("%s: newkey == NULL", __FUNCTION__); | |
441 | return 0; | |
442 | } | |
443 | enc = &newkey->enc; | |
444 | mac = &newkey->mac; | |
445 | comp = &newkey->comp; | |
446 | ||
447 | buffer_init(&b); | |
448 | /* Enc structure */ | |
449 | buffer_put_cstring(&b, enc->name); | |
450 | /* The cipher struct is constant and shared, you export pointer */ | |
451 | buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); | |
452 | buffer_put_int(&b, enc->enabled); | |
453 | buffer_put_int(&b, enc->block_size); | |
454 | buffer_put_string(&b, enc->key, enc->key_len); | |
455 | packet_get_keyiv(mode, enc->iv, enc->block_size); | |
456 | buffer_put_string(&b, enc->iv, enc->block_size); | |
457 | ||
458 | /* Mac structure */ | |
459 | buffer_put_cstring(&b, mac->name); | |
460 | buffer_put_int(&b, mac->enabled); | |
461 | buffer_put_string(&b, mac->key, mac->key_len); | |
462 | ||
463 | /* Comp structure */ | |
464 | buffer_put_int(&b, comp->type); | |
465 | buffer_put_int(&b, comp->enabled); | |
466 | buffer_put_cstring(&b, comp->name); | |
467 | ||
468 | len = buffer_len(&b); | |
469 | buf = xmalloc(len); | |
470 | memcpy(buf, buffer_ptr(&b), len); | |
471 | memset(buffer_ptr(&b), 0, len); | |
472 | buffer_free(&b); | |
473 | if (lenp != NULL) | |
474 | *lenp = len; | |
475 | if (blobp != NULL) | |
476 | *blobp = buf; | |
477 | return len; | |
478 | } | |
479 | ||
480 | static void | |
481 | mm_send_kex(Buffer *m, Kex *kex) | |
482 | { | |
483 | buffer_put_string(m, kex->session_id, kex->session_id_len); | |
484 | buffer_put_int(m, kex->we_need); | |
485 | buffer_put_int(m, kex->hostkey_type); | |
486 | buffer_put_int(m, kex->kex_type); | |
487 | buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); | |
488 | buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); | |
489 | buffer_put_int(m, kex->flags); | |
490 | buffer_put_cstring(m, kex->client_version_string); | |
491 | buffer_put_cstring(m, kex->server_version_string); | |
492 | } | |
493 | ||
494 | void | |
495 | mm_send_keystate(struct monitor *monitor) | |
496 | { | |
497 | Buffer m; | |
498 | u_char *blob, *p; | |
499 | u_int bloblen, plen; | |
500 | ||
501 | buffer_init(&m); | |
502 | ||
503 | if (!compat20) { | |
504 | u_char iv[24]; | |
505 | int ivlen; | |
506 | ||
507 | buffer_put_int(&m, packet_get_protocol_flags()); | |
508 | ||
509 | buffer_put_int(&m, packet_get_ssh1_cipher()); | |
510 | ||
511 | debug3("%s: Sending ssh1 IV", __FUNCTION__); | |
512 | ivlen = packet_get_keyiv_len(MODE_OUT); | |
513 | packet_get_keyiv(MODE_OUT, iv, ivlen); | |
514 | buffer_put_string(&m, iv, ivlen); | |
515 | ivlen = packet_get_keyiv_len(MODE_OUT); | |
516 | packet_get_keyiv(MODE_IN, iv, ivlen); | |
517 | buffer_put_string(&m, iv, ivlen); | |
518 | goto skip; | |
519 | } else { | |
520 | /* Kex for rekeying */ | |
521 | mm_send_kex(&m, *monitor->m_pkex); | |
522 | } | |
523 | ||
524 | debug3("%s: Sending new keys: %p %p", | |
525 | __FUNCTION__, newkeys[MODE_OUT], newkeys[MODE_IN]); | |
526 | ||
527 | /* Keys from Kex */ | |
528 | if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) | |
529 | fatal("%s: conversion of newkeys failed", __FUNCTION__); | |
530 | ||
531 | buffer_put_string(&m, blob, bloblen); | |
532 | xfree(blob); | |
533 | ||
534 | if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) | |
535 | fatal("%s: conversion of newkeys failed", __FUNCTION__); | |
536 | ||
537 | buffer_put_string(&m, blob, bloblen); | |
538 | xfree(blob); | |
539 | ||
540 | buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); | |
541 | buffer_put_int(&m, packet_get_seqnr(MODE_IN)); | |
542 | ||
543 | debug3("%s: New keys have been sent", __FUNCTION__); | |
544 | skip: | |
545 | /* More key context */ | |
546 | plen = packet_get_keycontext(MODE_OUT, NULL); | |
547 | p = xmalloc(plen+1); | |
548 | packet_get_keycontext(MODE_OUT, p); | |
549 | buffer_put_string(&m, p, plen); | |
550 | xfree(p); | |
551 | ||
552 | plen = packet_get_keycontext(MODE_IN, NULL); | |
553 | p = xmalloc(plen+1); | |
554 | packet_get_keycontext(MODE_IN, p); | |
555 | buffer_put_string(&m, p, plen); | |
556 | xfree(p); | |
557 | ||
558 | /* Compression state */ | |
559 | debug3("%s: Sending compression state", __FUNCTION__); | |
560 | buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); | |
561 | buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); | |
562 | ||
563 | /* Network I/O buffers */ | |
564 | buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); | |
565 | buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); | |
566 | ||
567 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); | |
568 | debug3("%s: Finished sending state", __FUNCTION__); | |
569 | ||
570 | buffer_free(&m); | |
571 | } | |
572 | ||
573 | int | |
574 | mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) | |
575 | { | |
576 | Buffer m; | |
577 | u_char *p; | |
578 | int success = 0; | |
579 | ||
580 | buffer_init(&m); | |
581 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_PTY, &m); | |
582 | ||
583 | debug3("%s: waiting for MONITOR_ANS_PTY", __FUNCTION__); | |
584 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_PTY, &m); | |
585 | ||
586 | success = buffer_get_int(&m); | |
587 | if (success == 0) { | |
588 | debug3("%s: pty alloc failed", __FUNCTION__); | |
589 | buffer_free(&m); | |
590 | return (0); | |
591 | } | |
592 | p = buffer_get_string(&m, NULL); | |
593 | buffer_free(&m); | |
594 | ||
595 | strlcpy(namebuf, p, namebuflen); /* Possible truncation */ | |
596 | xfree(p); | |
597 | ||
598 | *ptyfd = mm_receive_fd(monitor->m_recvfd); | |
599 | *ttyfd = mm_receive_fd(monitor->m_recvfd); | |
600 | ||
601 | /* Success */ | |
602 | return (1); | |
603 | } | |
604 | ||
605 | void | |
606 | mm_session_pty_cleanup2(void *session) | |
607 | { | |
608 | Session *s = session; | |
609 | Buffer m; | |
610 | ||
611 | if (s->ttyfd == -1) | |
612 | return; | |
613 | buffer_init(&m); | |
614 | buffer_put_cstring(&m, s->tty); | |
615 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); | |
616 | buffer_free(&m); | |
617 | ||
618 | /* closed dup'ed master */ | |
619 | if (close(s->ptymaster) < 0) | |
620 | error("close(s->ptymaster): %s", strerror(errno)); | |
621 | ||
622 | /* unlink pty from session */ | |
623 | s->ttyfd = -1; | |
624 | } | |
625 | ||
ad200abb | 626 | #ifdef USE_PAM |
627 | void | |
628 | mm_start_pam(char *user) | |
629 | { | |
630 | Buffer m; | |
631 | ||
632 | debug3("%s entering", __FUNCTION__); | |
633 | ||
634 | buffer_init(&m); | |
635 | buffer_put_cstring(&m, user); | |
636 | ||
637 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_PAM_START, &m); | |
638 | ||
639 | buffer_free(&m); | |
640 | } | |
641 | #endif /* USE_PAM */ | |
642 | ||
1853d1ef | 643 | /* Request process termination */ |
644 | ||
645 | void | |
646 | mm_terminate(void) | |
647 | { | |
648 | Buffer m; | |
649 | ||
650 | buffer_init(&m); | |
651 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_TERM, &m); | |
652 | buffer_free(&m); | |
653 | } | |
654 | ||
655 | int | |
656 | mm_ssh1_session_key(BIGNUM *num) | |
657 | { | |
658 | int rsafail; | |
659 | Buffer m; | |
660 | ||
661 | buffer_init(&m); | |
662 | buffer_put_bignum2(&m, num); | |
663 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); | |
664 | ||
665 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); | |
666 | ||
667 | rsafail = buffer_get_int(&m); | |
668 | buffer_get_bignum2(&m, num); | |
669 | ||
670 | buffer_free(&m); | |
671 | ||
672 | return (rsafail); | |
673 | } | |
674 | ||
675 | static void | |
676 | mm_chall_setup(char **name, char **infotxt, u_int *numprompts, | |
677 | char ***prompts, u_int **echo_on) | |
678 | { | |
679 | *name = xstrdup(""); | |
680 | *infotxt = xstrdup(""); | |
681 | *numprompts = 1; | |
682 | *prompts = xmalloc(*numprompts * sizeof(char*)); | |
683 | *echo_on = xmalloc(*numprompts * sizeof(u_int)); | |
684 | (*echo_on)[0] = 0; | |
685 | } | |
686 | ||
687 | int | |
688 | mm_bsdauth_query(void *ctx, char **name, char **infotxt, | |
689 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
690 | { | |
691 | Buffer m; | |
692 | int res; | |
693 | char *challenge; | |
694 | ||
695 | debug3("%s: entering", __FUNCTION__); | |
696 | ||
697 | buffer_init(&m); | |
698 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); | |
699 | ||
700 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, | |
701 | &m); | |
702 | res = buffer_get_int(&m); | |
703 | if (res == -1) { | |
704 | debug3("%s: no challenge", __FUNCTION__); | |
705 | buffer_free(&m); | |
706 | return (-1); | |
707 | } | |
708 | ||
709 | /* Get the challenge, and format the response */ | |
710 | challenge = buffer_get_string(&m, NULL); | |
711 | buffer_free(&m); | |
712 | ||
713 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
714 | (*prompts)[0] = challenge; | |
715 | ||
716 | debug3("%s: received challenge: %s", __FUNCTION__, challenge); | |
717 | ||
718 | return (0); | |
719 | } | |
720 | ||
721 | int | |
722 | mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) | |
723 | { | |
724 | Buffer m; | |
725 | int authok; | |
726 | ||
727 | debug3("%s: entering", __FUNCTION__); | |
728 | if (numresponses != 1) | |
729 | return (-1); | |
730 | ||
731 | buffer_init(&m); | |
732 | buffer_put_cstring(&m, responses[0]); | |
733 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); | |
734 | ||
735 | mm_request_receive_expect(monitor->m_recvfd, | |
736 | MONITOR_ANS_BSDAUTHRESPOND, &m); | |
737 | ||
738 | authok = buffer_get_int(&m); | |
739 | buffer_free(&m); | |
740 | ||
741 | return ((authok == 0) ? -1 : 0); | |
742 | } | |
743 | ||
744 | int | |
745 | mm_skey_query(void *ctx, char **name, char **infotxt, | |
746 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
747 | { | |
748 | Buffer m; | |
749 | int len, res; | |
750 | char *p, *challenge; | |
751 | ||
752 | debug3("%s: entering", __FUNCTION__); | |
753 | ||
754 | buffer_init(&m); | |
755 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); | |
756 | ||
757 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_SKEYQUERY, | |
758 | &m); | |
759 | res = buffer_get_int(&m); | |
760 | if (res == -1) { | |
761 | debug3("%s: no challenge", __FUNCTION__); | |
762 | buffer_free(&m); | |
763 | return (-1); | |
764 | } | |
765 | ||
766 | /* Get the challenge, and format the response */ | |
767 | challenge = buffer_get_string(&m, NULL); | |
768 | buffer_free(&m); | |
769 | ||
770 | debug3("%s: received challenge: %s", __FUNCTION__, challenge); | |
771 | ||
772 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
773 | ||
774 | len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; | |
775 | p = xmalloc(len); | |
776 | strlcpy(p, challenge, len); | |
777 | strlcat(p, SKEY_PROMPT, len); | |
778 | (*prompts)[0] = p; | |
779 | xfree(challenge); | |
780 | ||
781 | return (0); | |
782 | } | |
783 | ||
784 | int | |
785 | mm_skey_respond(void *ctx, u_int numresponses, char **responses) | |
786 | { | |
787 | Buffer m; | |
788 | int authok; | |
789 | ||
790 | debug3("%s: entering", __FUNCTION__); | |
791 | if (numresponses != 1) | |
792 | return (-1); | |
793 | ||
794 | buffer_init(&m); | |
795 | buffer_put_cstring(&m, responses[0]); | |
796 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); | |
797 | ||
798 | mm_request_receive_expect(monitor->m_recvfd, | |
799 | MONITOR_ANS_SKEYRESPOND, &m); | |
800 | ||
801 | authok = buffer_get_int(&m); | |
802 | buffer_free(&m); | |
803 | ||
804 | return ((authok == 0) ? -1 : 0); | |
805 | } | |
806 | ||
807 | void | |
808 | mm_ssh1_session_id(u_char session_id[16]) | |
809 | { | |
810 | Buffer m; | |
811 | int i; | |
812 | ||
813 | debug3("%s entering", __FUNCTION__); | |
814 | ||
815 | buffer_init(&m); | |
816 | for (i = 0; i < 16; i++) | |
817 | buffer_put_char(&m, session_id[i]); | |
818 | ||
819 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_SESSID, &m); | |
820 | buffer_free(&m); | |
821 | } | |
822 | ||
823 | int | |
824 | mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) | |
825 | { | |
826 | Buffer m; | |
827 | Key *key; | |
828 | u_char *blob; | |
829 | u_int blen; | |
830 | int allowed = 0; | |
831 | ||
832 | debug3("%s entering", __FUNCTION__); | |
833 | ||
834 | buffer_init(&m); | |
835 | buffer_put_bignum2(&m, client_n); | |
836 | ||
837 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); | |
838 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); | |
839 | ||
840 | allowed = buffer_get_int(&m); | |
841 | ||
842 | if (allowed && rkey != NULL) { | |
843 | blob = buffer_get_string(&m, &blen); | |
844 | if ((key = key_from_blob(blob, blen)) == NULL) | |
845 | fatal("%s: key_from_blob failed", __FUNCTION__); | |
846 | *rkey = key; | |
847 | xfree(blob); | |
848 | } | |
849 | mm_send_debug(&m); | |
850 | buffer_free(&m); | |
851 | ||
852 | return (allowed); | |
853 | } | |
854 | ||
855 | BIGNUM * | |
856 | mm_auth_rsa_generate_challenge(Key *key) | |
857 | { | |
858 | Buffer m; | |
859 | BIGNUM *challenge; | |
860 | u_char *blob; | |
861 | u_int blen; | |
862 | ||
863 | debug3("%s entering", __FUNCTION__); | |
864 | ||
865 | if ((challenge = BN_new()) == NULL) | |
866 | fatal("%s: BN_new failed", __FUNCTION__); | |
867 | ||
868 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
869 | if (key_to_blob(key, &blob, &blen) == 0) | |
870 | fatal("%s: key_to_blob failed", __FUNCTION__); | |
871 | key->type = KEY_RSA1; | |
872 | ||
873 | buffer_init(&m); | |
874 | buffer_put_string(&m, blob, blen); | |
875 | xfree(blob); | |
876 | ||
877 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); | |
878 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); | |
879 | ||
880 | buffer_get_bignum2(&m, challenge); | |
881 | buffer_free(&m); | |
882 | ||
883 | return (challenge); | |
884 | } | |
885 | ||
886 | int | |
887 | mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) | |
888 | { | |
889 | Buffer m; | |
890 | u_char *blob; | |
891 | u_int blen; | |
892 | int success = 0; | |
893 | ||
894 | debug3("%s entering", __FUNCTION__); | |
895 | ||
896 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
897 | if (key_to_blob(key, &blob, &blen) == 0) | |
898 | fatal("%s: key_to_blob failed", __FUNCTION__); | |
899 | key->type = KEY_RSA1; | |
900 | ||
901 | buffer_init(&m); | |
902 | buffer_put_string(&m, blob, blen); | |
903 | buffer_put_string(&m, response, 16); | |
904 | xfree(blob); | |
905 | ||
906 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); | |
907 | mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); | |
908 | ||
909 | success = buffer_get_int(&m); | |
910 | buffer_free(&m); | |
911 | ||
912 | return (success); | |
913 | } |