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826f3a39 | 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" | |
44a053a3 | 28 | RCSID("$OpenBSD: monitor_wrap.c,v 1.11 2002/06/19 18:01:00 markus Exp $"); |
826f3a39 | 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 | ||
b59afbfe | 54 | #ifdef GSSAPI |
55 | #include "ssh-gss.h" | |
56 | #endif | |
57 | ||
826f3a39 | 58 | /* Imports */ |
59 | extern int compat20; | |
60 | extern Newkeys *newkeys[]; | |
61 | extern z_stream incoming_stream; | |
62 | extern z_stream outgoing_stream; | |
63 | extern struct monitor *pmonitor; | |
64 | extern Buffer input, output; | |
65 | ||
66 | void | |
67 | mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) | |
68 | { | |
69 | u_char buf[5]; | |
70 | u_int mlen = buffer_len(m); | |
71 | ||
44a053a3 | 72 | debug3("%s entering: type %d", __func__, type); |
826f3a39 | 73 | |
74 | PUT_32BIT(buf, mlen + 1); | |
44a053a3 | 75 | buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ |
826f3a39 | 76 | if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf)) |
44a053a3 | 77 | fatal("%s: write", __func__); |
826f3a39 | 78 | if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen) |
44a053a3 | 79 | fatal("%s: write", __func__); |
826f3a39 | 80 | } |
81 | ||
82 | void | |
83 | mm_request_receive(int socket, Buffer *m) | |
84 | { | |
85 | u_char buf[4]; | |
86 | ssize_t res; | |
87 | u_int msg_len; | |
88 | ||
44a053a3 | 89 | debug3("%s entering", __func__); |
826f3a39 | 90 | |
91 | res = atomicio(read, socket, buf, sizeof(buf)); | |
92 | if (res != sizeof(buf)) { | |
93 | if (res == 0) | |
94 | fatal_cleanup(); | |
44a053a3 | 95 | fatal("%s: read: %ld", __func__, (long)res); |
826f3a39 | 96 | } |
97 | msg_len = GET_32BIT(buf); | |
98 | if (msg_len > 256 * 1024) | |
44a053a3 | 99 | fatal("%s: read: bad msg_len %d", __func__, msg_len); |
826f3a39 | 100 | buffer_clear(m); |
101 | buffer_append_space(m, msg_len); | |
102 | res = atomicio(read, socket, buffer_ptr(m), msg_len); | |
103 | if (res != msg_len) | |
44a053a3 | 104 | fatal("%s: read: %ld != msg_len", __func__, (long)res); |
826f3a39 | 105 | } |
106 | ||
107 | void | |
108 | mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m) | |
109 | { | |
110 | u_char rtype; | |
111 | ||
44a053a3 | 112 | debug3("%s entering: type %d", __func__, type); |
826f3a39 | 113 | |
114 | mm_request_receive(socket, m); | |
115 | rtype = buffer_get_char(m); | |
116 | if (rtype != type) | |
44a053a3 | 117 | fatal("%s: read: rtype %d != type %d", __func__, |
826f3a39 | 118 | rtype, type); |
119 | } | |
120 | ||
121 | DH * | |
122 | mm_choose_dh(int min, int nbits, int max) | |
123 | { | |
124 | BIGNUM *p, *g; | |
125 | int success = 0; | |
126 | Buffer m; | |
127 | ||
128 | buffer_init(&m); | |
129 | buffer_put_int(&m, min); | |
130 | buffer_put_int(&m, nbits); | |
131 | buffer_put_int(&m, max); | |
132 | ||
133 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); | |
134 | ||
44a053a3 | 135 | debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); |
826f3a39 | 136 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); |
137 | ||
138 | success = buffer_get_char(&m); | |
139 | if (success == 0) | |
44a053a3 | 140 | fatal("%s: MONITOR_ANS_MODULI failed", __func__); |
826f3a39 | 141 | |
142 | if ((p = BN_new()) == NULL) | |
44a053a3 | 143 | fatal("%s: BN_new failed", __func__); |
826f3a39 | 144 | if ((g = BN_new()) == NULL) |
44a053a3 | 145 | fatal("%s: BN_new failed", __func__); |
826f3a39 | 146 | buffer_get_bignum2(&m, p); |
147 | buffer_get_bignum2(&m, g); | |
148 | ||
44a053a3 | 149 | debug3("%s: remaining %d", __func__, buffer_len(&m)); |
826f3a39 | 150 | buffer_free(&m); |
151 | ||
152 | return (dh_new_group(g, p)); | |
153 | } | |
154 | ||
155 | int | |
156 | mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) | |
157 | { | |
158 | Kex *kex = *pmonitor->m_pkex; | |
159 | Buffer m; | |
160 | ||
44a053a3 | 161 | debug3("%s entering", __func__); |
826f3a39 | 162 | |
163 | buffer_init(&m); | |
164 | buffer_put_int(&m, kex->host_key_index(key)); | |
165 | buffer_put_string(&m, data, datalen); | |
166 | ||
167 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); | |
168 | ||
44a053a3 | 169 | debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); |
826f3a39 | 170 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); |
171 | *sigp = buffer_get_string(&m, lenp); | |
172 | buffer_free(&m); | |
173 | ||
174 | return (0); | |
175 | } | |
176 | ||
177 | struct passwd * | |
178 | mm_getpwnamallow(const char *login) | |
179 | { | |
180 | Buffer m; | |
181 | struct passwd *pw; | |
182 | u_int pwlen; | |
183 | ||
44a053a3 | 184 | debug3("%s entering", __func__); |
826f3a39 | 185 | |
186 | buffer_init(&m); | |
187 | buffer_put_cstring(&m, login); | |
188 | ||
189 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); | |
190 | ||
44a053a3 | 191 | debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); |
826f3a39 | 192 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); |
193 | ||
194 | if (buffer_get_char(&m) == 0) { | |
195 | buffer_free(&m); | |
196 | return (NULL); | |
197 | } | |
198 | pw = buffer_get_string(&m, &pwlen); | |
199 | if (pwlen != sizeof(struct passwd)) | |
44a053a3 | 200 | fatal("%s: struct passwd size mismatch", __func__); |
826f3a39 | 201 | pw->pw_name = buffer_get_string(&m, NULL); |
202 | pw->pw_passwd = buffer_get_string(&m, NULL); | |
203 | pw->pw_gecos = buffer_get_string(&m, NULL); | |
204 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
205 | pw->pw_class = buffer_get_string(&m, NULL); | |
206 | #endif | |
207 | pw->pw_dir = buffer_get_string(&m, NULL); | |
208 | pw->pw_shell = buffer_get_string(&m, NULL); | |
209 | buffer_free(&m); | |
210 | ||
211 | return (pw); | |
212 | } | |
213 | ||
214 | char* mm_auth2_read_banner(void) | |
215 | { | |
216 | Buffer m; | |
217 | char *banner; | |
218 | ||
44a053a3 | 219 | debug3("%s entering", __func__); |
826f3a39 | 220 | |
221 | buffer_init(&m); | |
222 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); | |
223 | buffer_clear(&m); | |
224 | ||
225 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m); | |
226 | banner = buffer_get_string(&m, NULL); | |
227 | buffer_free(&m); | |
44a053a3 | 228 | |
826f3a39 | 229 | return (banner); |
230 | } | |
231 | ||
232 | /* Inform the privileged process about service and style */ | |
233 | ||
234 | void | |
235 | mm_inform_authserv(char *service, char *style) | |
236 | { | |
237 | Buffer m; | |
238 | ||
44a053a3 | 239 | debug3("%s entering", __func__); |
826f3a39 | 240 | |
241 | buffer_init(&m); | |
242 | buffer_put_cstring(&m, service); | |
243 | buffer_put_cstring(&m, style ? style : ""); | |
244 | ||
245 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); | |
246 | ||
247 | buffer_free(&m); | |
248 | } | |
249 | ||
250 | /* Do the password authentication */ | |
251 | int | |
252 | mm_auth_password(Authctxt *authctxt, char *password) | |
253 | { | |
254 | Buffer m; | |
255 | int authenticated = 0; | |
256 | ||
44a053a3 | 257 | debug3("%s entering", __func__); |
826f3a39 | 258 | |
259 | buffer_init(&m); | |
260 | buffer_put_cstring(&m, password); | |
261 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); | |
262 | ||
44a053a3 | 263 | debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); |
826f3a39 | 264 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); |
265 | ||
266 | authenticated = buffer_get_int(&m); | |
267 | ||
268 | buffer_free(&m); | |
269 | ||
270 | debug3("%s: user %sauthenticated", | |
44a053a3 | 271 | __func__, authenticated ? "" : "not "); |
826f3a39 | 272 | return (authenticated); |
273 | } | |
274 | ||
275 | int | |
276 | mm_user_key_allowed(struct passwd *pw, Key *key) | |
277 | { | |
278 | return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); | |
279 | } | |
280 | ||
281 | int | |
282 | mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, | |
283 | Key *key) | |
284 | { | |
285 | return (mm_key_allowed(MM_HOSTKEY, user, host, key)); | |
286 | } | |
287 | ||
288 | int | |
289 | mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, | |
290 | char *host, Key *key) | |
291 | { | |
292 | int ret; | |
293 | ||
294 | key->type = KEY_RSA; /* XXX hack for key_to_blob */ | |
295 | ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); | |
296 | key->type = KEY_RSA1; | |
297 | return (ret); | |
298 | } | |
299 | ||
300 | static void | |
301 | mm_send_debug(Buffer *m) | |
302 | { | |
303 | char *msg; | |
304 | ||
305 | while (buffer_len(m)) { | |
306 | msg = buffer_get_string(m, NULL); | |
44a053a3 | 307 | debug3("%s: Sending debug: %s", __func__, msg); |
826f3a39 | 308 | packet_send_debug("%s", msg); |
309 | xfree(msg); | |
310 | } | |
311 | } | |
312 | ||
313 | int | |
314 | mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) | |
315 | { | |
316 | Buffer m; | |
317 | u_char *blob; | |
318 | u_int len; | |
319 | int allowed = 0; | |
320 | ||
44a053a3 | 321 | debug3("%s entering", __func__); |
826f3a39 | 322 | |
323 | /* Convert the key to a blob and the pass it over */ | |
324 | if (!key_to_blob(key, &blob, &len)) | |
325 | return (0); | |
326 | ||
327 | buffer_init(&m); | |
328 | buffer_put_int(&m, type); | |
329 | buffer_put_cstring(&m, user ? user : ""); | |
330 | buffer_put_cstring(&m, host ? host : ""); | |
331 | buffer_put_string(&m, blob, len); | |
332 | xfree(blob); | |
333 | ||
334 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); | |
335 | ||
44a053a3 | 336 | debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); |
826f3a39 | 337 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); |
338 | ||
339 | allowed = buffer_get_int(&m); | |
340 | ||
341 | /* Send potential debug messages */ | |
342 | mm_send_debug(&m); | |
343 | ||
344 | buffer_free(&m); | |
345 | ||
346 | return (allowed); | |
347 | } | |
348 | ||
349 | /* | |
350 | * This key verify needs to send the key type along, because the | |
351 | * privileged parent makes the decision if the key is allowed | |
352 | * for authentication. | |
353 | */ | |
354 | ||
355 | int | |
356 | mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) | |
357 | { | |
358 | Buffer m; | |
359 | u_char *blob; | |
360 | u_int len; | |
361 | int verified = 0; | |
362 | ||
44a053a3 | 363 | debug3("%s entering", __func__); |
826f3a39 | 364 | |
365 | /* Convert the key to a blob and the pass it over */ | |
366 | if (!key_to_blob(key, &blob, &len)) | |
367 | return (0); | |
368 | ||
369 | buffer_init(&m); | |
370 | buffer_put_string(&m, blob, len); | |
371 | buffer_put_string(&m, sig, siglen); | |
372 | buffer_put_string(&m, data, datalen); | |
373 | xfree(blob); | |
374 | ||
375 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); | |
376 | ||
44a053a3 | 377 | debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); |
826f3a39 | 378 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); |
379 | ||
380 | verified = buffer_get_int(&m); | |
381 | ||
382 | buffer_free(&m); | |
383 | ||
384 | return (verified); | |
385 | } | |
386 | ||
387 | /* Export key state after authentication */ | |
388 | Newkeys * | |
389 | mm_newkeys_from_blob(u_char *blob, int blen) | |
390 | { | |
391 | Buffer b; | |
392 | u_int len; | |
393 | Newkeys *newkey = NULL; | |
394 | Enc *enc; | |
395 | Mac *mac; | |
396 | Comp *comp; | |
397 | ||
44a053a3 | 398 | debug3("%s: %p(%d)", __func__, blob, blen); |
826f3a39 | 399 | #ifdef DEBUG_PK |
400 | dump_base64(stderr, blob, blen); | |
401 | #endif | |
402 | buffer_init(&b); | |
403 | buffer_append(&b, blob, blen); | |
404 | ||
405 | newkey = xmalloc(sizeof(*newkey)); | |
406 | enc = &newkey->enc; | |
407 | mac = &newkey->mac; | |
408 | comp = &newkey->comp; | |
409 | ||
410 | /* Enc structure */ | |
411 | enc->name = buffer_get_string(&b, NULL); | |
412 | buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); | |
413 | enc->enabled = buffer_get_int(&b); | |
414 | enc->block_size = buffer_get_int(&b); | |
415 | enc->key = buffer_get_string(&b, &enc->key_len); | |
416 | enc->iv = buffer_get_string(&b, &len); | |
417 | if (len != enc->block_size) | |
44a053a3 | 418 | fatal("%s: bad ivlen: expected %d != %d", __func__, |
826f3a39 | 419 | enc->block_size, len); |
420 | ||
421 | if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) | |
44a053a3 | 422 | fatal("%s: bad cipher name %s or pointer %p", __func__, |
826f3a39 | 423 | enc->name, enc->cipher); |
424 | ||
425 | /* Mac structure */ | |
426 | mac->name = buffer_get_string(&b, NULL); | |
427 | if (mac->name == NULL || mac_init(mac, mac->name) == -1) | |
44a053a3 | 428 | fatal("%s: can not init mac %s", __func__, mac->name); |
826f3a39 | 429 | mac->enabled = buffer_get_int(&b); |
430 | mac->key = buffer_get_string(&b, &len); | |
431 | if (len > mac->key_len) | |
44a053a3 | 432 | fatal("%s: bad mac key length: %d > %d", __func__, len, |
826f3a39 | 433 | mac->key_len); |
434 | mac->key_len = len; | |
435 | ||
436 | /* Comp structure */ | |
437 | comp->type = buffer_get_int(&b); | |
438 | comp->enabled = buffer_get_int(&b); | |
439 | comp->name = buffer_get_string(&b, NULL); | |
440 | ||
441 | len = buffer_len(&b); | |
442 | if (len != 0) | |
443 | error("newkeys_from_blob: remaining bytes in blob %d", len); | |
444 | buffer_free(&b); | |
445 | return (newkey); | |
446 | } | |
447 | ||
448 | int | |
449 | mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) | |
450 | { | |
451 | Buffer b; | |
452 | int len; | |
453 | u_char *buf; | |
454 | Enc *enc; | |
455 | Mac *mac; | |
456 | Comp *comp; | |
457 | Newkeys *newkey = newkeys[mode]; | |
458 | ||
44a053a3 | 459 | debug3("%s: converting %p", __func__, newkey); |
826f3a39 | 460 | |
461 | if (newkey == NULL) { | |
44a053a3 | 462 | error("%s: newkey == NULL", __func__); |
826f3a39 | 463 | return 0; |
464 | } | |
465 | enc = &newkey->enc; | |
466 | mac = &newkey->mac; | |
467 | comp = &newkey->comp; | |
468 | ||
469 | buffer_init(&b); | |
470 | /* Enc structure */ | |
471 | buffer_put_cstring(&b, enc->name); | |
472 | /* The cipher struct is constant and shared, you export pointer */ | |
473 | buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); | |
474 | buffer_put_int(&b, enc->enabled); | |
475 | buffer_put_int(&b, enc->block_size); | |
476 | buffer_put_string(&b, enc->key, enc->key_len); | |
477 | packet_get_keyiv(mode, enc->iv, enc->block_size); | |
478 | buffer_put_string(&b, enc->iv, enc->block_size); | |
479 | ||
480 | /* Mac structure */ | |
481 | buffer_put_cstring(&b, mac->name); | |
482 | buffer_put_int(&b, mac->enabled); | |
483 | buffer_put_string(&b, mac->key, mac->key_len); | |
484 | ||
485 | /* Comp structure */ | |
486 | buffer_put_int(&b, comp->type); | |
487 | buffer_put_int(&b, comp->enabled); | |
488 | buffer_put_cstring(&b, comp->name); | |
489 | ||
490 | len = buffer_len(&b); | |
491 | buf = xmalloc(len); | |
492 | memcpy(buf, buffer_ptr(&b), len); | |
493 | memset(buffer_ptr(&b), 0, len); | |
494 | buffer_free(&b); | |
495 | if (lenp != NULL) | |
496 | *lenp = len; | |
497 | if (blobp != NULL) | |
498 | *blobp = buf; | |
499 | return len; | |
500 | } | |
501 | ||
502 | static void | |
503 | mm_send_kex(Buffer *m, Kex *kex) | |
504 | { | |
505 | buffer_put_string(m, kex->session_id, kex->session_id_len); | |
506 | buffer_put_int(m, kex->we_need); | |
507 | buffer_put_int(m, kex->hostkey_type); | |
508 | buffer_put_int(m, kex->kex_type); | |
509 | buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); | |
510 | buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); | |
511 | buffer_put_int(m, kex->flags); | |
512 | buffer_put_cstring(m, kex->client_version_string); | |
513 | buffer_put_cstring(m, kex->server_version_string); | |
514 | } | |
515 | ||
516 | void | |
517 | mm_send_keystate(struct monitor *pmonitor) | |
518 | { | |
519 | Buffer m; | |
520 | u_char *blob, *p; | |
521 | u_int bloblen, plen; | |
522 | ||
523 | buffer_init(&m); | |
524 | ||
525 | if (!compat20) { | |
526 | u_char iv[24]; | |
44a053a3 | 527 | u_char *key; |
528 | u_int ivlen, keylen; | |
826f3a39 | 529 | |
530 | buffer_put_int(&m, packet_get_protocol_flags()); | |
531 | ||
532 | buffer_put_int(&m, packet_get_ssh1_cipher()); | |
533 | ||
44a053a3 | 534 | debug3("%s: Sending ssh1 KEY+IV", __func__); |
535 | keylen = packet_get_encryption_key(NULL); | |
536 | key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ | |
537 | keylen = packet_get_encryption_key(key); | |
538 | buffer_put_string(&m, key, keylen); | |
539 | memset(key, 0, keylen); | |
540 | xfree(key); | |
541 | ||
826f3a39 | 542 | ivlen = packet_get_keyiv_len(MODE_OUT); |
543 | packet_get_keyiv(MODE_OUT, iv, ivlen); | |
544 | buffer_put_string(&m, iv, ivlen); | |
545 | ivlen = packet_get_keyiv_len(MODE_OUT); | |
546 | packet_get_keyiv(MODE_IN, iv, ivlen); | |
547 | buffer_put_string(&m, iv, ivlen); | |
548 | goto skip; | |
549 | } else { | |
550 | /* Kex for rekeying */ | |
551 | mm_send_kex(&m, *pmonitor->m_pkex); | |
552 | } | |
553 | ||
554 | debug3("%s: Sending new keys: %p %p", | |
44a053a3 | 555 | __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); |
826f3a39 | 556 | |
557 | /* Keys from Kex */ | |
558 | if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) | |
44a053a3 | 559 | fatal("%s: conversion of newkeys failed", __func__); |
826f3a39 | 560 | |
561 | buffer_put_string(&m, blob, bloblen); | |
562 | xfree(blob); | |
563 | ||
564 | if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) | |
44a053a3 | 565 | fatal("%s: conversion of newkeys failed", __func__); |
826f3a39 | 566 | |
567 | buffer_put_string(&m, blob, bloblen); | |
568 | xfree(blob); | |
569 | ||
570 | buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); | |
571 | buffer_put_int(&m, packet_get_seqnr(MODE_IN)); | |
572 | ||
44a053a3 | 573 | debug3("%s: New keys have been sent", __func__); |
826f3a39 | 574 | skip: |
575 | /* More key context */ | |
576 | plen = packet_get_keycontext(MODE_OUT, NULL); | |
577 | p = xmalloc(plen+1); | |
578 | packet_get_keycontext(MODE_OUT, p); | |
579 | buffer_put_string(&m, p, plen); | |
580 | xfree(p); | |
581 | ||
582 | plen = packet_get_keycontext(MODE_IN, NULL); | |
583 | p = xmalloc(plen+1); | |
584 | packet_get_keycontext(MODE_IN, p); | |
585 | buffer_put_string(&m, p, plen); | |
586 | xfree(p); | |
587 | ||
588 | /* Compression state */ | |
44a053a3 | 589 | debug3("%s: Sending compression state", __func__); |
826f3a39 | 590 | buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); |
591 | buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); | |
592 | ||
593 | /* Network I/O buffers */ | |
594 | buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); | |
595 | buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); | |
596 | ||
597 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); | |
44a053a3 | 598 | debug3("%s: Finished sending state", __func__); |
826f3a39 | 599 | |
600 | buffer_free(&m); | |
601 | } | |
602 | ||
603 | int | |
604 | mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) | |
605 | { | |
606 | Buffer m; | |
607 | u_char *p; | |
608 | int success = 0; | |
609 | ||
610 | buffer_init(&m); | |
611 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); | |
612 | ||
44a053a3 | 613 | debug3("%s: waiting for MONITOR_ANS_PTY", __func__); |
826f3a39 | 614 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); |
615 | ||
616 | success = buffer_get_int(&m); | |
617 | if (success == 0) { | |
44a053a3 | 618 | debug3("%s: pty alloc failed", __func__); |
826f3a39 | 619 | buffer_free(&m); |
620 | return (0); | |
621 | } | |
622 | p = buffer_get_string(&m, NULL); | |
623 | buffer_free(&m); | |
624 | ||
625 | strlcpy(namebuf, p, namebuflen); /* Possible truncation */ | |
626 | xfree(p); | |
627 | ||
628 | *ptyfd = mm_receive_fd(pmonitor->m_recvfd); | |
629 | *ttyfd = mm_receive_fd(pmonitor->m_recvfd); | |
630 | ||
631 | /* Success */ | |
632 | return (1); | |
633 | } | |
634 | ||
635 | void | |
636 | mm_session_pty_cleanup2(void *session) | |
637 | { | |
638 | Session *s = session; | |
639 | Buffer m; | |
640 | ||
641 | if (s->ttyfd == -1) | |
642 | return; | |
643 | buffer_init(&m); | |
644 | buffer_put_cstring(&m, s->tty); | |
645 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); | |
646 | buffer_free(&m); | |
647 | ||
648 | /* closed dup'ed master */ | |
649 | if (close(s->ptymaster) < 0) | |
650 | error("close(s->ptymaster): %s", strerror(errno)); | |
651 | ||
652 | /* unlink pty from session */ | |
653 | s->ttyfd = -1; | |
654 | } | |
655 | ||
656 | #ifdef USE_PAM | |
657 | void | |
658 | mm_start_pam(char *user) | |
659 | { | |
660 | Buffer m; | |
661 | ||
44a053a3 | 662 | debug3("%s entering", __func__); |
826f3a39 | 663 | |
664 | buffer_init(&m); | |
665 | buffer_put_cstring(&m, user); | |
666 | ||
667 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); | |
668 | ||
669 | buffer_free(&m); | |
670 | } | |
671 | #endif /* USE_PAM */ | |
672 | ||
673 | /* Request process termination */ | |
674 | ||
675 | void | |
676 | mm_terminate(void) | |
677 | { | |
678 | Buffer m; | |
679 | ||
680 | buffer_init(&m); | |
681 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); | |
682 | buffer_free(&m); | |
683 | } | |
684 | ||
685 | int | |
686 | mm_ssh1_session_key(BIGNUM *num) | |
687 | { | |
688 | int rsafail; | |
689 | Buffer m; | |
690 | ||
691 | buffer_init(&m); | |
692 | buffer_put_bignum2(&m, num); | |
693 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); | |
694 | ||
695 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); | |
696 | ||
697 | rsafail = buffer_get_int(&m); | |
698 | buffer_get_bignum2(&m, num); | |
699 | ||
700 | buffer_free(&m); | |
701 | ||
702 | return (rsafail); | |
703 | } | |
704 | ||
705 | static void | |
706 | mm_chall_setup(char **name, char **infotxt, u_int *numprompts, | |
707 | char ***prompts, u_int **echo_on) | |
708 | { | |
44a053a3 | 709 | *name = xstrdup(""); |
710 | *infotxt = xstrdup(""); | |
826f3a39 | 711 | *numprompts = 1; |
712 | *prompts = xmalloc(*numprompts * sizeof(char*)); | |
713 | *echo_on = xmalloc(*numprompts * sizeof(u_int)); | |
714 | (*echo_on)[0] = 0; | |
715 | } | |
716 | ||
717 | int | |
718 | mm_bsdauth_query(void *ctx, char **name, char **infotxt, | |
719 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
720 | { | |
721 | Buffer m; | |
722 | int res; | |
723 | char *challenge; | |
724 | ||
44a053a3 | 725 | debug3("%s: entering", __func__); |
826f3a39 | 726 | |
727 | buffer_init(&m); | |
728 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); | |
729 | ||
730 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, | |
731 | &m); | |
732 | res = buffer_get_int(&m); | |
733 | if (res == -1) { | |
44a053a3 | 734 | debug3("%s: no challenge", __func__); |
826f3a39 | 735 | buffer_free(&m); |
736 | return (-1); | |
737 | } | |
738 | ||
739 | /* Get the challenge, and format the response */ | |
740 | challenge = buffer_get_string(&m, NULL); | |
741 | buffer_free(&m); | |
742 | ||
743 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
744 | (*prompts)[0] = challenge; | |
745 | ||
44a053a3 | 746 | debug3("%s: received challenge: %s", __func__, challenge); |
826f3a39 | 747 | |
748 | return (0); | |
749 | } | |
750 | ||
751 | int | |
752 | mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) | |
753 | { | |
754 | Buffer m; | |
755 | int authok; | |
756 | ||
44a053a3 | 757 | debug3("%s: entering", __func__); |
826f3a39 | 758 | if (numresponses != 1) |
759 | return (-1); | |
760 | ||
761 | buffer_init(&m); | |
762 | buffer_put_cstring(&m, responses[0]); | |
763 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); | |
764 | ||
765 | mm_request_receive_expect(pmonitor->m_recvfd, | |
766 | MONITOR_ANS_BSDAUTHRESPOND, &m); | |
767 | ||
768 | authok = buffer_get_int(&m); | |
769 | buffer_free(&m); | |
770 | ||
771 | return ((authok == 0) ? -1 : 0); | |
772 | } | |
773 | ||
774 | int | |
775 | mm_skey_query(void *ctx, char **name, char **infotxt, | |
776 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
777 | { | |
778 | Buffer m; | |
779 | int len, res; | |
780 | char *p, *challenge; | |
781 | ||
44a053a3 | 782 | debug3("%s: entering", __func__); |
826f3a39 | 783 | |
784 | buffer_init(&m); | |
785 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); | |
786 | ||
787 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, | |
788 | &m); | |
789 | res = buffer_get_int(&m); | |
790 | if (res == -1) { | |
44a053a3 | 791 | debug3("%s: no challenge", __func__); |
826f3a39 | 792 | buffer_free(&m); |
793 | return (-1); | |
794 | } | |
795 | ||
796 | /* Get the challenge, and format the response */ | |
797 | challenge = buffer_get_string(&m, NULL); | |
798 | buffer_free(&m); | |
799 | ||
44a053a3 | 800 | debug3("%s: received challenge: %s", __func__, challenge); |
826f3a39 | 801 | |
802 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
803 | ||
804 | len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; | |
805 | p = xmalloc(len); | |
806 | strlcpy(p, challenge, len); | |
807 | strlcat(p, SKEY_PROMPT, len); | |
808 | (*prompts)[0] = p; | |
809 | xfree(challenge); | |
810 | ||
811 | return (0); | |
812 | } | |
813 | ||
814 | int | |
815 | mm_skey_respond(void *ctx, u_int numresponses, char **responses) | |
816 | { | |
817 | Buffer m; | |
818 | int authok; | |
819 | ||
44a053a3 | 820 | debug3("%s: entering", __func__); |
826f3a39 | 821 | if (numresponses != 1) |
822 | return (-1); | |
823 | ||
824 | buffer_init(&m); | |
825 | buffer_put_cstring(&m, responses[0]); | |
826 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); | |
827 | ||
828 | mm_request_receive_expect(pmonitor->m_recvfd, | |
829 | MONITOR_ANS_SKEYRESPOND, &m); | |
830 | ||
831 | authok = buffer_get_int(&m); | |
832 | buffer_free(&m); | |
833 | ||
834 | return ((authok == 0) ? -1 : 0); | |
835 | } | |
836 | ||
837 | void | |
838 | mm_ssh1_session_id(u_char session_id[16]) | |
839 | { | |
840 | Buffer m; | |
841 | int i; | |
842 | ||
44a053a3 | 843 | debug3("%s entering", __func__); |
826f3a39 | 844 | |
845 | buffer_init(&m); | |
846 | for (i = 0; i < 16; i++) | |
847 | buffer_put_char(&m, session_id[i]); | |
848 | ||
849 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); | |
850 | buffer_free(&m); | |
851 | } | |
852 | ||
853 | int | |
854 | mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) | |
855 | { | |
856 | Buffer m; | |
857 | Key *key; | |
858 | u_char *blob; | |
859 | u_int blen; | |
860 | int allowed = 0; | |
861 | ||
44a053a3 | 862 | debug3("%s entering", __func__); |
826f3a39 | 863 | |
864 | buffer_init(&m); | |
865 | buffer_put_bignum2(&m, client_n); | |
866 | ||
867 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); | |
868 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); | |
869 | ||
870 | allowed = buffer_get_int(&m); | |
871 | ||
872 | if (allowed && rkey != NULL) { | |
873 | blob = buffer_get_string(&m, &blen); | |
874 | if ((key = key_from_blob(blob, blen)) == NULL) | |
44a053a3 | 875 | fatal("%s: key_from_blob failed", __func__); |
826f3a39 | 876 | *rkey = key; |
877 | xfree(blob); | |
878 | } | |
879 | mm_send_debug(&m); | |
880 | buffer_free(&m); | |
881 | ||
882 | return (allowed); | |
883 | } | |
884 | ||
885 | BIGNUM * | |
886 | mm_auth_rsa_generate_challenge(Key *key) | |
887 | { | |
888 | Buffer m; | |
889 | BIGNUM *challenge; | |
890 | u_char *blob; | |
891 | u_int blen; | |
892 | ||
44a053a3 | 893 | debug3("%s entering", __func__); |
826f3a39 | 894 | |
895 | if ((challenge = BN_new()) == NULL) | |
44a053a3 | 896 | fatal("%s: BN_new failed", __func__); |
826f3a39 | 897 | |
898 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
899 | if (key_to_blob(key, &blob, &blen) == 0) | |
44a053a3 | 900 | fatal("%s: key_to_blob failed", __func__); |
826f3a39 | 901 | key->type = KEY_RSA1; |
902 | ||
903 | buffer_init(&m); | |
904 | buffer_put_string(&m, blob, blen); | |
905 | xfree(blob); | |
906 | ||
907 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); | |
908 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); | |
909 | ||
910 | buffer_get_bignum2(&m, challenge); | |
911 | buffer_free(&m); | |
912 | ||
913 | return (challenge); | |
914 | } | |
915 | ||
916 | int | |
917 | mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) | |
918 | { | |
919 | Buffer m; | |
920 | u_char *blob; | |
921 | u_int blen; | |
922 | int success = 0; | |
923 | ||
44a053a3 | 924 | debug3("%s entering", __func__); |
826f3a39 | 925 | |
926 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
927 | if (key_to_blob(key, &blob, &blen) == 0) | |
44a053a3 | 928 | fatal("%s: key_to_blob failed", __func__); |
826f3a39 | 929 | key->type = KEY_RSA1; |
930 | ||
931 | buffer_init(&m); | |
932 | buffer_put_string(&m, blob, blen); | |
933 | buffer_put_string(&m, response, 16); | |
934 | xfree(blob); | |
935 | ||
936 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); | |
937 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); | |
938 | ||
939 | success = buffer_get_int(&m); | |
940 | buffer_free(&m); | |
941 | ||
942 | return (success); | |
943 | } | |
b59afbfe | 944 | #ifdef GSSAPI |
945 | OM_uint32 | |
946 | mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid) { | |
947 | Buffer m; | |
948 | OM_uint32 major; | |
949 | ||
950 | /* Client doesn't get to see the context */ | |
951 | *ctx=NULL; | |
952 | ||
953 | buffer_init(&m); | |
954 | buffer_put_string(&m,oid->elements,oid->length); | |
955 | ||
956 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); | |
957 | ||
958 | debug3("%s: waiting for MONITOR_ANS_GSSSETUP",__func__); | |
959 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); | |
960 | major=buffer_get_int(&m); | |
961 | ||
962 | return(major); | |
963 | } | |
964 | ||
965 | OM_uint32 | |
966 | mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, | |
967 | gss_buffer_desc *out, OM_uint32 *flags) { | |
968 | ||
969 | Buffer m; | |
970 | OM_uint32 major; | |
971 | ||
972 | buffer_init(&m); | |
973 | buffer_put_string(&m, in->value, in->length); | |
974 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); | |
975 | ||
976 | debug3("%s: waiting for MONITOR_ANS_GSSSTEP", __func__); | |
977 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); | |
978 | ||
979 | major=buffer_get_int(&m); | |
980 | out->value=buffer_get_string(&m,&out->length); | |
981 | if (flags) *flags=buffer_get_int(&m); | |
982 | ||
983 | return(major); | |
984 | } | |
985 | ||
986 | int | |
987 | mm_ssh_gssapi_userok(char *user) { | |
988 | Buffer m; | |
989 | int authenticated = 0; | |
990 | ||
991 | buffer_init(&m); | |
992 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); | |
993 | ||
994 | debug3("%s: waiting for MONITOR_ANS_GSSUSEROK", __func__); | |
995 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, | |
996 | &m); | |
997 | ||
998 | authenticated = buffer_get_int(&m); | |
999 | ||
1000 | buffer_free(&m); | |
1001 | debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); | |
1002 | return(authenticated); | |
1003 | } | |
1004 | ||
1005 | int | |
1006 | mm_ssh_gssapi_localname(char **lname) | |
1007 | { | |
1008 | Buffer m; | |
1009 | ||
1010 | buffer_init(&m); | |
1011 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSLOCALNAME, &m); | |
1012 | ||
1013 | debug3("%s: waiting for MONITOR_ANS_GSSLOCALNAME", __func__); | |
1014 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSLOCALNAME, | |
1015 | &m); | |
1016 | ||
1017 | *lname = buffer_get_string(&m, NULL); | |
1018 | ||
1019 | buffer_free(&m); | |
1020 | if (lname[0] == '\0') { | |
1021 | debug3("%s: gssapi identity mapping failed", __func__); | |
1022 | } else { | |
1023 | debug3("%s: gssapi identity mapped to %s", __func__, *lname); | |
1024 | } | |
1025 | ||
1026 | return(0); | |
1027 | } | |
1028 | ||
1029 | OM_uint32 | |
1030 | mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash) { | |
1031 | Buffer m; | |
1032 | OM_uint32 major; | |
1033 | ||
1034 | buffer_init(&m); | |
1035 | buffer_put_string(&m, data->value, data->length); | |
1036 | ||
1037 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, &m); | |
1038 | ||
1039 | debug3("%s: waiting for MONITOR_ANS_GSSSIGN",__func__); | |
1040 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, &m); | |
1041 | major=buffer_get_int(&m); | |
1042 | hash->value = buffer_get_string(&m, &hash->length); | |
1043 | ||
1044 | return(major); | |
1045 | } | |
1046 | #endif /* GSSAPI */ | |
1047 | ||
1048 | #ifdef GSI | |
1049 | ||
1050 | int mm_gsi_gridmap(char *subject_name, char **lname) | |
1051 | { | |
1052 | Buffer m; | |
1053 | ||
1054 | buffer_init(&m); | |
1055 | buffer_put_cstring(&m, subject_name); | |
1056 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSIGRIDMAP, &m); | |
1057 | ||
1058 | debug3("%s: waiting for MONITOR_ANS_GSIGRIDMAP", __func__); | |
1059 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSIGRIDMAP, | |
1060 | &m); | |
1061 | ||
1062 | *lname = buffer_get_string(&m, NULL); | |
1063 | ||
1064 | buffer_free(&m); | |
1065 | if (lname[0] == '\0') { | |
1066 | debug3("%s: gssapi identity %s mapping failed", __func__, | |
1067 | subject_name); | |
1068 | } else { | |
1069 | debug3("%s: gssapi identity %s mapped to %s", __func__, | |
1070 | subject_name, *lname); | |
1071 | } | |
1072 | ||
1073 | return(0); | |
1074 | ||
1075 | } | |
1076 | ||
1077 | #endif /* GSI */ |