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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" | |
ffd7b36b | 28 | RCSID("$OpenBSD: monitor_wrap.c,v 1.25 2003/04/02 09:48:07 markus 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" | |
92e15201 | 37 | #include "auth-options.h" |
1853d1ef | 38 | #include "buffer.h" |
39 | #include "bufaux.h" | |
40 | #include "packet.h" | |
41 | #include "mac.h" | |
42 | #include "log.h" | |
43 | #include "zlib.h" | |
44 | #include "monitor.h" | |
45 | #include "monitor_wrap.h" | |
46 | #include "xmalloc.h" | |
47 | #include "atomicio.h" | |
48 | #include "monitor_fdpass.h" | |
49 | #include "getput.h" | |
50 | ||
51 | #include "auth.h" | |
52 | #include "channels.h" | |
53 | #include "session.h" | |
54 | ||
55 | /* Imports */ | |
56 | extern int compat20; | |
57 | extern Newkeys *newkeys[]; | |
58 | extern z_stream incoming_stream; | |
59 | extern z_stream outgoing_stream; | |
b5a28cbc | 60 | extern struct monitor *pmonitor; |
1853d1ef | 61 | extern Buffer input, output; |
62 | ||
63 | void | |
64 | mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) | |
65 | { | |
1853d1ef | 66 | u_int mlen = buffer_len(m); |
405a0d43 | 67 | u_char buf[5]; |
1853d1ef | 68 | |
1588c277 | 69 | debug3("%s entering: type %d", __func__, type); |
1853d1ef | 70 | |
71 | PUT_32BIT(buf, mlen + 1); | |
7203d6bb | 72 | buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ |
1853d1ef | 73 | if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf)) |
1588c277 | 74 | fatal("%s: write", __func__); |
1853d1ef | 75 | if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen) |
1588c277 | 76 | fatal("%s: write", __func__); |
1853d1ef | 77 | } |
78 | ||
79 | void | |
80 | mm_request_receive(int socket, Buffer *m) | |
81 | { | |
82 | u_char buf[4]; | |
1853d1ef | 83 | u_int msg_len; |
405a0d43 | 84 | ssize_t res; |
1853d1ef | 85 | |
1588c277 | 86 | debug3("%s entering", __func__); |
1853d1ef | 87 | |
88 | res = atomicio(read, socket, buf, sizeof(buf)); | |
89 | if (res != sizeof(buf)) { | |
90 | if (res == 0) | |
91 | fatal_cleanup(); | |
1588c277 | 92 | fatal("%s: read: %ld", __func__, (long)res); |
1853d1ef | 93 | } |
94 | msg_len = GET_32BIT(buf); | |
95 | if (msg_len > 256 * 1024) | |
1588c277 | 96 | fatal("%s: read: bad msg_len %d", __func__, msg_len); |
1853d1ef | 97 | buffer_clear(m); |
98 | buffer_append_space(m, msg_len); | |
99 | res = atomicio(read, socket, buffer_ptr(m), msg_len); | |
100 | if (res != msg_len) | |
1588c277 | 101 | fatal("%s: read: %ld != msg_len", __func__, (long)res); |
1853d1ef | 102 | } |
103 | ||
104 | void | |
105 | mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m) | |
106 | { | |
107 | u_char rtype; | |
108 | ||
1588c277 | 109 | debug3("%s entering: type %d", __func__, type); |
1853d1ef | 110 | |
111 | mm_request_receive(socket, m); | |
112 | rtype = buffer_get_char(m); | |
113 | if (rtype != type) | |
1588c277 | 114 | fatal("%s: read: rtype %d != type %d", __func__, |
1853d1ef | 115 | rtype, type); |
116 | } | |
117 | ||
118 | DH * | |
119 | mm_choose_dh(int min, int nbits, int max) | |
120 | { | |
121 | BIGNUM *p, *g; | |
122 | int success = 0; | |
123 | Buffer m; | |
124 | ||
125 | buffer_init(&m); | |
126 | buffer_put_int(&m, min); | |
127 | buffer_put_int(&m, nbits); | |
128 | buffer_put_int(&m, max); | |
129 | ||
b5a28cbc | 130 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); |
1853d1ef | 131 | |
1588c277 | 132 | debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); |
b5a28cbc | 133 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); |
1853d1ef | 134 | |
135 | success = buffer_get_char(&m); | |
136 | if (success == 0) | |
1588c277 | 137 | fatal("%s: MONITOR_ANS_MODULI failed", __func__); |
1853d1ef | 138 | |
139 | if ((p = BN_new()) == NULL) | |
1588c277 | 140 | fatal("%s: BN_new failed", __func__); |
1853d1ef | 141 | if ((g = BN_new()) == NULL) |
1588c277 | 142 | fatal("%s: BN_new failed", __func__); |
1853d1ef | 143 | buffer_get_bignum2(&m, p); |
144 | buffer_get_bignum2(&m, g); | |
145 | ||
1588c277 | 146 | debug3("%s: remaining %d", __func__, buffer_len(&m)); |
1853d1ef | 147 | buffer_free(&m); |
148 | ||
149 | return (dh_new_group(g, p)); | |
150 | } | |
151 | ||
152 | int | |
153 | mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) | |
154 | { | |
b5a28cbc | 155 | Kex *kex = *pmonitor->m_pkex; |
1853d1ef | 156 | Buffer m; |
157 | ||
1588c277 | 158 | debug3("%s entering", __func__); |
1853d1ef | 159 | |
160 | buffer_init(&m); | |
161 | buffer_put_int(&m, kex->host_key_index(key)); | |
162 | buffer_put_string(&m, data, datalen); | |
163 | ||
b5a28cbc | 164 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); |
1853d1ef | 165 | |
1588c277 | 166 | debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); |
b5a28cbc | 167 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); |
1853d1ef | 168 | *sigp = buffer_get_string(&m, lenp); |
169 | buffer_free(&m); | |
170 | ||
171 | return (0); | |
172 | } | |
173 | ||
174 | struct passwd * | |
175 | mm_getpwnamallow(const char *login) | |
176 | { | |
177 | Buffer m; | |
178 | struct passwd *pw; | |
179 | u_int pwlen; | |
180 | ||
1588c277 | 181 | debug3("%s entering", __func__); |
1853d1ef | 182 | |
183 | buffer_init(&m); | |
184 | buffer_put_cstring(&m, login); | |
185 | ||
b5a28cbc | 186 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); |
1853d1ef | 187 | |
1588c277 | 188 | debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); |
b5a28cbc | 189 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); |
1853d1ef | 190 | |
191 | if (buffer_get_char(&m) == 0) { | |
192 | buffer_free(&m); | |
193 | return (NULL); | |
194 | } | |
195 | pw = buffer_get_string(&m, &pwlen); | |
196 | if (pwlen != sizeof(struct passwd)) | |
1588c277 | 197 | fatal("%s: struct passwd size mismatch", __func__); |
1853d1ef | 198 | pw->pw_name = buffer_get_string(&m, NULL); |
199 | pw->pw_passwd = buffer_get_string(&m, NULL); | |
200 | pw->pw_gecos = buffer_get_string(&m, NULL); | |
7b18c353 | 201 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 202 | pw->pw_class = buffer_get_string(&m, NULL); |
7b18c353 | 203 | #endif |
1853d1ef | 204 | pw->pw_dir = buffer_get_string(&m, NULL); |
205 | pw->pw_shell = buffer_get_string(&m, NULL); | |
206 | buffer_free(&m); | |
207 | ||
208 | return (pw); | |
209 | } | |
210 | ||
343288b8 | 211 | char *mm_auth2_read_banner(void) |
94a73cdc | 212 | { |
213 | Buffer m; | |
214 | char *banner; | |
215 | ||
1588c277 | 216 | debug3("%s entering", __func__); |
94a73cdc | 217 | |
218 | buffer_init(&m); | |
b5a28cbc | 219 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); |
94a73cdc | 220 | buffer_clear(&m); |
221 | ||
b5a28cbc | 222 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m); |
94a73cdc | 223 | banner = buffer_get_string(&m, NULL); |
224 | buffer_free(&m); | |
7203d6bb | 225 | |
94a73cdc | 226 | return (banner); |
227 | } | |
228 | ||
1853d1ef | 229 | /* Inform the privileged process about service and style */ |
230 | ||
231 | void | |
232 | mm_inform_authserv(char *service, char *style) | |
233 | { | |
234 | Buffer m; | |
235 | ||
1588c277 | 236 | debug3("%s entering", __func__); |
1853d1ef | 237 | |
238 | buffer_init(&m); | |
239 | buffer_put_cstring(&m, service); | |
240 | buffer_put_cstring(&m, style ? style : ""); | |
241 | ||
b5a28cbc | 242 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); |
1853d1ef | 243 | |
244 | buffer_free(&m); | |
245 | } | |
246 | ||
247 | /* Do the password authentication */ | |
248 | int | |
249 | mm_auth_password(Authctxt *authctxt, char *password) | |
250 | { | |
251 | Buffer m; | |
252 | int authenticated = 0; | |
253 | ||
1588c277 | 254 | debug3("%s entering", __func__); |
1853d1ef | 255 | |
256 | buffer_init(&m); | |
257 | buffer_put_cstring(&m, password); | |
b5a28cbc | 258 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); |
1853d1ef | 259 | |
1588c277 | 260 | debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); |
b5a28cbc | 261 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); |
1853d1ef | 262 | |
263 | authenticated = buffer_get_int(&m); | |
264 | ||
265 | buffer_free(&m); | |
266 | ||
267 | debug3("%s: user %sauthenticated", | |
1588c277 | 268 | __func__, authenticated ? "" : "not "); |
1853d1ef | 269 | return (authenticated); |
270 | } | |
271 | ||
272 | int | |
273 | mm_user_key_allowed(struct passwd *pw, Key *key) | |
274 | { | |
275 | return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); | |
276 | } | |
277 | ||
278 | int | |
279 | mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, | |
280 | Key *key) | |
281 | { | |
282 | return (mm_key_allowed(MM_HOSTKEY, user, host, key)); | |
283 | } | |
284 | ||
285 | int | |
286 | mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, | |
287 | char *host, Key *key) | |
288 | { | |
289 | int ret; | |
290 | ||
291 | key->type = KEY_RSA; /* XXX hack for key_to_blob */ | |
292 | ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); | |
293 | key->type = KEY_RSA1; | |
294 | return (ret); | |
295 | } | |
296 | ||
297 | static void | |
298 | mm_send_debug(Buffer *m) | |
299 | { | |
300 | char *msg; | |
301 | ||
302 | while (buffer_len(m)) { | |
303 | msg = buffer_get_string(m, NULL); | |
1588c277 | 304 | debug3("%s: Sending debug: %s", __func__, msg); |
1853d1ef | 305 | packet_send_debug("%s", msg); |
306 | xfree(msg); | |
307 | } | |
308 | } | |
309 | ||
310 | int | |
311 | mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) | |
312 | { | |
313 | Buffer m; | |
314 | u_char *blob; | |
315 | u_int len; | |
92e15201 | 316 | int allowed = 0, have_forced = 0; |
1853d1ef | 317 | |
1588c277 | 318 | debug3("%s entering", __func__); |
1853d1ef | 319 | |
320 | /* Convert the key to a blob and the pass it over */ | |
321 | if (!key_to_blob(key, &blob, &len)) | |
322 | return (0); | |
323 | ||
324 | buffer_init(&m); | |
325 | buffer_put_int(&m, type); | |
326 | buffer_put_cstring(&m, user ? user : ""); | |
327 | buffer_put_cstring(&m, host ? host : ""); | |
328 | buffer_put_string(&m, blob, len); | |
329 | xfree(blob); | |
330 | ||
b5a28cbc | 331 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); |
1853d1ef | 332 | |
1588c277 | 333 | debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); |
b5a28cbc | 334 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); |
1853d1ef | 335 | |
336 | allowed = buffer_get_int(&m); | |
337 | ||
92e15201 | 338 | /* fake forced command */ |
339 | auth_clear_options(); | |
340 | have_forced = buffer_get_int(&m); | |
341 | forced_command = have_forced ? xstrdup("true") : NULL; | |
342 | ||
1853d1ef | 343 | /* Send potential debug messages */ |
344 | mm_send_debug(&m); | |
345 | ||
346 | buffer_free(&m); | |
347 | ||
348 | return (allowed); | |
349 | } | |
350 | ||
351 | /* | |
352 | * This key verify needs to send the key type along, because the | |
353 | * privileged parent makes the decision if the key is allowed | |
354 | * for authentication. | |
355 | */ | |
356 | ||
357 | int | |
358 | mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) | |
359 | { | |
360 | Buffer m; | |
361 | u_char *blob; | |
362 | u_int len; | |
363 | int verified = 0; | |
364 | ||
1588c277 | 365 | debug3("%s entering", __func__); |
1853d1ef | 366 | |
367 | /* Convert the key to a blob and the pass it over */ | |
368 | if (!key_to_blob(key, &blob, &len)) | |
369 | return (0); | |
370 | ||
371 | buffer_init(&m); | |
372 | buffer_put_string(&m, blob, len); | |
373 | buffer_put_string(&m, sig, siglen); | |
374 | buffer_put_string(&m, data, datalen); | |
375 | xfree(blob); | |
376 | ||
b5a28cbc | 377 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); |
1853d1ef | 378 | |
1588c277 | 379 | debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); |
b5a28cbc | 380 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); |
1853d1ef | 381 | |
382 | verified = buffer_get_int(&m); | |
383 | ||
384 | buffer_free(&m); | |
385 | ||
386 | return (verified); | |
387 | } | |
388 | ||
389 | /* Export key state after authentication */ | |
390 | Newkeys * | |
391 | mm_newkeys_from_blob(u_char *blob, int blen) | |
392 | { | |
393 | Buffer b; | |
394 | u_int len; | |
395 | Newkeys *newkey = NULL; | |
396 | Enc *enc; | |
397 | Mac *mac; | |
398 | Comp *comp; | |
399 | ||
1588c277 | 400 | debug3("%s: %p(%d)", __func__, blob, blen); |
1853d1ef | 401 | #ifdef DEBUG_PK |
402 | dump_base64(stderr, blob, blen); | |
403 | #endif | |
404 | buffer_init(&b); | |
405 | buffer_append(&b, blob, blen); | |
406 | ||
407 | newkey = xmalloc(sizeof(*newkey)); | |
408 | enc = &newkey->enc; | |
409 | mac = &newkey->mac; | |
410 | comp = &newkey->comp; | |
411 | ||
412 | /* Enc structure */ | |
413 | enc->name = buffer_get_string(&b, NULL); | |
414 | buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); | |
415 | enc->enabled = buffer_get_int(&b); | |
416 | enc->block_size = buffer_get_int(&b); | |
417 | enc->key = buffer_get_string(&b, &enc->key_len); | |
418 | enc->iv = buffer_get_string(&b, &len); | |
419 | if (len != enc->block_size) | |
bb0640b2 | 420 | fatal("%s: bad ivlen: expected %u != %u", __func__, |
1853d1ef | 421 | enc->block_size, len); |
422 | ||
423 | if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) | |
1588c277 | 424 | fatal("%s: bad cipher name %s or pointer %p", __func__, |
1853d1ef | 425 | enc->name, enc->cipher); |
426 | ||
427 | /* Mac structure */ | |
428 | mac->name = buffer_get_string(&b, NULL); | |
429 | if (mac->name == NULL || mac_init(mac, mac->name) == -1) | |
1588c277 | 430 | fatal("%s: can not init mac %s", __func__, mac->name); |
1853d1ef | 431 | mac->enabled = buffer_get_int(&b); |
432 | mac->key = buffer_get_string(&b, &len); | |
433 | if (len > mac->key_len) | |
bb0640b2 | 434 | fatal("%s: bad mac key length: %u > %d", __func__, len, |
1853d1ef | 435 | mac->key_len); |
436 | mac->key_len = len; | |
437 | ||
438 | /* Comp structure */ | |
439 | comp->type = buffer_get_int(&b); | |
440 | comp->enabled = buffer_get_int(&b); | |
441 | comp->name = buffer_get_string(&b, NULL); | |
442 | ||
443 | len = buffer_len(&b); | |
444 | if (len != 0) | |
bb0640b2 | 445 | error("newkeys_from_blob: remaining bytes in blob %u", len); |
1853d1ef | 446 | buffer_free(&b); |
447 | return (newkey); | |
448 | } | |
449 | ||
450 | int | |
451 | mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) | |
452 | { | |
453 | Buffer b; | |
454 | int len; | |
1853d1ef | 455 | Enc *enc; |
456 | Mac *mac; | |
457 | Comp *comp; | |
458 | Newkeys *newkey = newkeys[mode]; | |
459 | ||
1588c277 | 460 | debug3("%s: converting %p", __func__, newkey); |
1853d1ef | 461 | |
462 | if (newkey == NULL) { | |
1588c277 | 463 | error("%s: newkey == NULL", __func__); |
1853d1ef | 464 | return 0; |
465 | } | |
466 | enc = &newkey->enc; | |
467 | mac = &newkey->mac; | |
468 | comp = &newkey->comp; | |
469 | ||
470 | buffer_init(&b); | |
471 | /* Enc structure */ | |
472 | buffer_put_cstring(&b, enc->name); | |
473 | /* The cipher struct is constant and shared, you export pointer */ | |
474 | buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); | |
475 | buffer_put_int(&b, enc->enabled); | |
476 | buffer_put_int(&b, enc->block_size); | |
477 | buffer_put_string(&b, enc->key, enc->key_len); | |
478 | packet_get_keyiv(mode, enc->iv, enc->block_size); | |
479 | buffer_put_string(&b, enc->iv, enc->block_size); | |
480 | ||
481 | /* Mac structure */ | |
482 | buffer_put_cstring(&b, mac->name); | |
483 | buffer_put_int(&b, mac->enabled); | |
484 | buffer_put_string(&b, mac->key, mac->key_len); | |
485 | ||
486 | /* Comp structure */ | |
487 | buffer_put_int(&b, comp->type); | |
488 | buffer_put_int(&b, comp->enabled); | |
489 | buffer_put_cstring(&b, comp->name); | |
490 | ||
491 | len = buffer_len(&b); | |
1853d1ef | 492 | if (lenp != NULL) |
493 | *lenp = len; | |
eb9f2fab | 494 | if (blobp != NULL) { |
495 | *blobp = xmalloc(len); | |
496 | memcpy(*blobp, buffer_ptr(&b), len); | |
497 | } | |
498 | memset(buffer_ptr(&b), 0, len); | |
499 | buffer_free(&b); | |
1853d1ef | 500 | return len; |
501 | } | |
502 | ||
503 | static void | |
504 | mm_send_kex(Buffer *m, Kex *kex) | |
505 | { | |
506 | buffer_put_string(m, kex->session_id, kex->session_id_len); | |
507 | buffer_put_int(m, kex->we_need); | |
508 | buffer_put_int(m, kex->hostkey_type); | |
509 | buffer_put_int(m, kex->kex_type); | |
510 | buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); | |
511 | buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); | |
512 | buffer_put_int(m, kex->flags); | |
513 | buffer_put_cstring(m, kex->client_version_string); | |
514 | buffer_put_cstring(m, kex->server_version_string); | |
515 | } | |
516 | ||
517 | void | |
b5a28cbc | 518 | mm_send_keystate(struct monitor *pmonitor) |
1853d1ef | 519 | { |
520 | Buffer m; | |
521 | u_char *blob, *p; | |
522 | u_int bloblen, plen; | |
ffd7b36b | 523 | u_int32_t seqnr, packets; |
524 | u_int64_t blocks; | |
1853d1ef | 525 | |
526 | buffer_init(&m); | |
527 | ||
528 | if (!compat20) { | |
529 | u_char iv[24]; | |
9459414c | 530 | u_char *key; |
531 | u_int ivlen, keylen; | |
1853d1ef | 532 | |
533 | buffer_put_int(&m, packet_get_protocol_flags()); | |
534 | ||
535 | buffer_put_int(&m, packet_get_ssh1_cipher()); | |
536 | ||
9459414c | 537 | debug3("%s: Sending ssh1 KEY+IV", __func__); |
538 | keylen = packet_get_encryption_key(NULL); | |
539 | key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ | |
540 | keylen = packet_get_encryption_key(key); | |
541 | buffer_put_string(&m, key, keylen); | |
542 | memset(key, 0, keylen); | |
543 | xfree(key); | |
544 | ||
1853d1ef | 545 | ivlen = packet_get_keyiv_len(MODE_OUT); |
546 | packet_get_keyiv(MODE_OUT, iv, ivlen); | |
547 | buffer_put_string(&m, iv, ivlen); | |
548 | ivlen = packet_get_keyiv_len(MODE_OUT); | |
549 | packet_get_keyiv(MODE_IN, iv, ivlen); | |
550 | buffer_put_string(&m, iv, ivlen); | |
551 | goto skip; | |
552 | } else { | |
553 | /* Kex for rekeying */ | |
b5a28cbc | 554 | mm_send_kex(&m, *pmonitor->m_pkex); |
1853d1ef | 555 | } |
556 | ||
557 | debug3("%s: Sending new keys: %p %p", | |
1588c277 | 558 | __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); |
1853d1ef | 559 | |
560 | /* Keys from Kex */ | |
561 | if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) | |
1588c277 | 562 | fatal("%s: conversion of newkeys failed", __func__); |
1853d1ef | 563 | |
564 | buffer_put_string(&m, blob, bloblen); | |
565 | xfree(blob); | |
566 | ||
567 | if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) | |
1588c277 | 568 | fatal("%s: conversion of newkeys failed", __func__); |
1853d1ef | 569 | |
570 | buffer_put_string(&m, blob, bloblen); | |
571 | xfree(blob); | |
572 | ||
ffd7b36b | 573 | packet_get_state(MODE_OUT, &seqnr, &blocks, &packets); |
574 | buffer_put_int(&m, seqnr); | |
575 | buffer_put_int64(&m, blocks); | |
576 | buffer_put_int(&m, packets); | |
577 | packet_get_state(MODE_OUT, &seqnr, &blocks, &packets); | |
578 | buffer_put_int(&m, seqnr); | |
579 | buffer_put_int64(&m, blocks); | |
580 | buffer_put_int(&m, packets); | |
1853d1ef | 581 | |
1588c277 | 582 | debug3("%s: New keys have been sent", __func__); |
1853d1ef | 583 | skip: |
584 | /* More key context */ | |
585 | plen = packet_get_keycontext(MODE_OUT, NULL); | |
586 | p = xmalloc(plen+1); | |
587 | packet_get_keycontext(MODE_OUT, p); | |
588 | buffer_put_string(&m, p, plen); | |
589 | xfree(p); | |
590 | ||
591 | plen = packet_get_keycontext(MODE_IN, NULL); | |
592 | p = xmalloc(plen+1); | |
593 | packet_get_keycontext(MODE_IN, p); | |
594 | buffer_put_string(&m, p, plen); | |
595 | xfree(p); | |
596 | ||
597 | /* Compression state */ | |
1588c277 | 598 | debug3("%s: Sending compression state", __func__); |
1853d1ef | 599 | buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); |
600 | buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); | |
601 | ||
602 | /* Network I/O buffers */ | |
603 | buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); | |
604 | buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); | |
605 | ||
b5a28cbc | 606 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); |
1588c277 | 607 | debug3("%s: Finished sending state", __func__); |
1853d1ef | 608 | |
609 | buffer_free(&m); | |
610 | } | |
611 | ||
612 | int | |
613 | mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) | |
614 | { | |
615 | Buffer m; | |
661e45a0 | 616 | char *p; |
1853d1ef | 617 | int success = 0; |
618 | ||
619 | buffer_init(&m); | |
b5a28cbc | 620 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); |
1853d1ef | 621 | |
1588c277 | 622 | debug3("%s: waiting for MONITOR_ANS_PTY", __func__); |
b5a28cbc | 623 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); |
1853d1ef | 624 | |
625 | success = buffer_get_int(&m); | |
626 | if (success == 0) { | |
1588c277 | 627 | debug3("%s: pty alloc failed", __func__); |
1853d1ef | 628 | buffer_free(&m); |
629 | return (0); | |
630 | } | |
631 | p = buffer_get_string(&m, NULL); | |
632 | buffer_free(&m); | |
633 | ||
634 | strlcpy(namebuf, p, namebuflen); /* Possible truncation */ | |
635 | xfree(p); | |
636 | ||
b5a28cbc | 637 | *ptyfd = mm_receive_fd(pmonitor->m_recvfd); |
638 | *ttyfd = mm_receive_fd(pmonitor->m_recvfd); | |
1853d1ef | 639 | |
640 | /* Success */ | |
641 | return (1); | |
642 | } | |
643 | ||
644 | void | |
645 | mm_session_pty_cleanup2(void *session) | |
646 | { | |
647 | Session *s = session; | |
648 | Buffer m; | |
649 | ||
650 | if (s->ttyfd == -1) | |
651 | return; | |
652 | buffer_init(&m); | |
653 | buffer_put_cstring(&m, s->tty); | |
b5a28cbc | 654 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); |
1853d1ef | 655 | buffer_free(&m); |
656 | ||
657 | /* closed dup'ed master */ | |
658 | if (close(s->ptymaster) < 0) | |
659 | error("close(s->ptymaster): %s", strerror(errno)); | |
660 | ||
661 | /* unlink pty from session */ | |
662 | s->ttyfd = -1; | |
663 | } | |
664 | ||
ad200abb | 665 | #ifdef USE_PAM |
666 | void | |
667 | mm_start_pam(char *user) | |
668 | { | |
669 | Buffer m; | |
670 | ||
1588c277 | 671 | debug3("%s entering", __func__); |
ad200abb | 672 | |
673 | buffer_init(&m); | |
674 | buffer_put_cstring(&m, user); | |
675 | ||
b5a28cbc | 676 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); |
ad200abb | 677 | |
678 | buffer_free(&m); | |
679 | } | |
680 | #endif /* USE_PAM */ | |
681 | ||
1853d1ef | 682 | /* Request process termination */ |
683 | ||
684 | void | |
685 | mm_terminate(void) | |
686 | { | |
687 | Buffer m; | |
688 | ||
689 | buffer_init(&m); | |
b5a28cbc | 690 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); |
1853d1ef | 691 | buffer_free(&m); |
692 | } | |
693 | ||
694 | int | |
695 | mm_ssh1_session_key(BIGNUM *num) | |
696 | { | |
697 | int rsafail; | |
698 | Buffer m; | |
699 | ||
700 | buffer_init(&m); | |
701 | buffer_put_bignum2(&m, num); | |
b5a28cbc | 702 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); |
1853d1ef | 703 | |
b5a28cbc | 704 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); |
1853d1ef | 705 | |
706 | rsafail = buffer_get_int(&m); | |
707 | buffer_get_bignum2(&m, num); | |
708 | ||
709 | buffer_free(&m); | |
710 | ||
711 | return (rsafail); | |
712 | } | |
713 | ||
714 | static void | |
715 | mm_chall_setup(char **name, char **infotxt, u_int *numprompts, | |
716 | char ***prompts, u_int **echo_on) | |
717 | { | |
7203d6bb | 718 | *name = xstrdup(""); |
719 | *infotxt = xstrdup(""); | |
1853d1ef | 720 | *numprompts = 1; |
343288b8 | 721 | *prompts = xmalloc(*numprompts * sizeof(char *)); |
1853d1ef | 722 | *echo_on = xmalloc(*numprompts * sizeof(u_int)); |
723 | (*echo_on)[0] = 0; | |
724 | } | |
725 | ||
726 | int | |
727 | mm_bsdauth_query(void *ctx, char **name, char **infotxt, | |
728 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
729 | { | |
730 | Buffer m; | |
6d6c25e3 | 731 | u_int success; |
1853d1ef | 732 | char *challenge; |
733 | ||
1588c277 | 734 | debug3("%s: entering", __func__); |
1853d1ef | 735 | |
736 | buffer_init(&m); | |
b5a28cbc | 737 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); |
1853d1ef | 738 | |
b5a28cbc | 739 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, |
1853d1ef | 740 | &m); |
6d6c25e3 | 741 | success = buffer_get_int(&m); |
742 | if (success == 0) { | |
1588c277 | 743 | debug3("%s: no challenge", __func__); |
1853d1ef | 744 | buffer_free(&m); |
745 | return (-1); | |
746 | } | |
747 | ||
748 | /* Get the challenge, and format the response */ | |
749 | challenge = buffer_get_string(&m, NULL); | |
750 | buffer_free(&m); | |
751 | ||
752 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
753 | (*prompts)[0] = challenge; | |
754 | ||
1588c277 | 755 | debug3("%s: received challenge: %s", __func__, challenge); |
1853d1ef | 756 | |
757 | return (0); | |
758 | } | |
759 | ||
760 | int | |
761 | mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) | |
762 | { | |
763 | Buffer m; | |
764 | int authok; | |
765 | ||
1588c277 | 766 | debug3("%s: entering", __func__); |
1853d1ef | 767 | if (numresponses != 1) |
768 | return (-1); | |
769 | ||
770 | buffer_init(&m); | |
771 | buffer_put_cstring(&m, responses[0]); | |
b5a28cbc | 772 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); |
1853d1ef | 773 | |
b5a28cbc | 774 | mm_request_receive_expect(pmonitor->m_recvfd, |
1853d1ef | 775 | MONITOR_ANS_BSDAUTHRESPOND, &m); |
776 | ||
777 | authok = buffer_get_int(&m); | |
778 | buffer_free(&m); | |
779 | ||
780 | return ((authok == 0) ? -1 : 0); | |
781 | } | |
782 | ||
783 | int | |
784 | mm_skey_query(void *ctx, char **name, char **infotxt, | |
785 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
786 | { | |
787 | Buffer m; | |
6d6c25e3 | 788 | int len; |
789 | u_int success; | |
1853d1ef | 790 | char *p, *challenge; |
791 | ||
1588c277 | 792 | debug3("%s: entering", __func__); |
1853d1ef | 793 | |
794 | buffer_init(&m); | |
b5a28cbc | 795 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); |
1853d1ef | 796 | |
b5a28cbc | 797 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, |
1853d1ef | 798 | &m); |
6d6c25e3 | 799 | success = buffer_get_int(&m); |
800 | if (success == 0) { | |
1588c277 | 801 | debug3("%s: no challenge", __func__); |
1853d1ef | 802 | buffer_free(&m); |
803 | return (-1); | |
804 | } | |
805 | ||
806 | /* Get the challenge, and format the response */ | |
807 | challenge = buffer_get_string(&m, NULL); | |
808 | buffer_free(&m); | |
809 | ||
1588c277 | 810 | debug3("%s: received challenge: %s", __func__, challenge); |
1853d1ef | 811 | |
812 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
813 | ||
814 | len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; | |
815 | p = xmalloc(len); | |
816 | strlcpy(p, challenge, len); | |
817 | strlcat(p, SKEY_PROMPT, len); | |
818 | (*prompts)[0] = p; | |
819 | xfree(challenge); | |
820 | ||
821 | return (0); | |
822 | } | |
823 | ||
824 | int | |
825 | mm_skey_respond(void *ctx, u_int numresponses, char **responses) | |
826 | { | |
827 | Buffer m; | |
828 | int authok; | |
829 | ||
1588c277 | 830 | debug3("%s: entering", __func__); |
1853d1ef | 831 | if (numresponses != 1) |
832 | return (-1); | |
833 | ||
834 | buffer_init(&m); | |
835 | buffer_put_cstring(&m, responses[0]); | |
b5a28cbc | 836 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); |
1853d1ef | 837 | |
b5a28cbc | 838 | mm_request_receive_expect(pmonitor->m_recvfd, |
1853d1ef | 839 | MONITOR_ANS_SKEYRESPOND, &m); |
840 | ||
841 | authok = buffer_get_int(&m); | |
842 | buffer_free(&m); | |
843 | ||
844 | return ((authok == 0) ? -1 : 0); | |
845 | } | |
846 | ||
847 | void | |
848 | mm_ssh1_session_id(u_char session_id[16]) | |
849 | { | |
850 | Buffer m; | |
851 | int i; | |
852 | ||
1588c277 | 853 | debug3("%s entering", __func__); |
1853d1ef | 854 | |
855 | buffer_init(&m); | |
856 | for (i = 0; i < 16; i++) | |
857 | buffer_put_char(&m, session_id[i]); | |
858 | ||
b5a28cbc | 859 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); |
1853d1ef | 860 | buffer_free(&m); |
861 | } | |
862 | ||
863 | int | |
864 | mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) | |
865 | { | |
866 | Buffer m; | |
867 | Key *key; | |
868 | u_char *blob; | |
869 | u_int blen; | |
92e15201 | 870 | int allowed = 0, have_forced = 0; |
1853d1ef | 871 | |
1588c277 | 872 | debug3("%s entering", __func__); |
1853d1ef | 873 | |
874 | buffer_init(&m); | |
875 | buffer_put_bignum2(&m, client_n); | |
876 | ||
b5a28cbc | 877 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); |
878 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); | |
1853d1ef | 879 | |
880 | allowed = buffer_get_int(&m); | |
881 | ||
92e15201 | 882 | /* fake forced command */ |
883 | auth_clear_options(); | |
884 | have_forced = buffer_get_int(&m); | |
885 | forced_command = have_forced ? xstrdup("true") : NULL; | |
886 | ||
1853d1ef | 887 | if (allowed && rkey != NULL) { |
888 | blob = buffer_get_string(&m, &blen); | |
889 | if ((key = key_from_blob(blob, blen)) == NULL) | |
1588c277 | 890 | fatal("%s: key_from_blob failed", __func__); |
1853d1ef | 891 | *rkey = key; |
892 | xfree(blob); | |
893 | } | |
894 | mm_send_debug(&m); | |
895 | buffer_free(&m); | |
896 | ||
897 | return (allowed); | |
898 | } | |
899 | ||
900 | BIGNUM * | |
901 | mm_auth_rsa_generate_challenge(Key *key) | |
902 | { | |
903 | Buffer m; | |
904 | BIGNUM *challenge; | |
905 | u_char *blob; | |
906 | u_int blen; | |
907 | ||
1588c277 | 908 | debug3("%s entering", __func__); |
1853d1ef | 909 | |
910 | if ((challenge = BN_new()) == NULL) | |
1588c277 | 911 | fatal("%s: BN_new failed", __func__); |
1853d1ef | 912 | |
913 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
914 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 915 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 916 | key->type = KEY_RSA1; |
917 | ||
918 | buffer_init(&m); | |
919 | buffer_put_string(&m, blob, blen); | |
920 | xfree(blob); | |
921 | ||
b5a28cbc | 922 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); |
923 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); | |
1853d1ef | 924 | |
925 | buffer_get_bignum2(&m, challenge); | |
926 | buffer_free(&m); | |
927 | ||
928 | return (challenge); | |
929 | } | |
930 | ||
931 | int | |
932 | mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) | |
933 | { | |
934 | Buffer m; | |
935 | u_char *blob; | |
936 | u_int blen; | |
937 | int success = 0; | |
938 | ||
1588c277 | 939 | debug3("%s entering", __func__); |
1853d1ef | 940 | |
941 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
942 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 943 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 944 | key->type = KEY_RSA1; |
945 | ||
946 | buffer_init(&m); | |
947 | buffer_put_string(&m, blob, blen); | |
948 | buffer_put_string(&m, response, 16); | |
949 | xfree(blob); | |
950 | ||
b5a28cbc | 951 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); |
952 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); | |
1853d1ef | 953 | |
954 | success = buffer_get_int(&m); | |
955 | buffer_free(&m); | |
956 | ||
957 | return (success); | |
958 | } | |
696f6bef | 959 | |
2db9d8aa | 960 | #ifdef KRB4 |
961 | int | |
962 | mm_auth_krb4(Authctxt *authctxt, void *_auth, char **client, void *_reply) | |
963 | { | |
964 | KTEXT auth, reply; | |
965 | Buffer m; | |
966 | u_int rlen; | |
967 | int success = 0; | |
968 | char *p; | |
969 | ||
970 | debug3("%s entering", __func__); | |
971 | auth = _auth; | |
972 | reply = _reply; | |
973 | ||
974 | buffer_init(&m); | |
975 | buffer_put_string(&m, auth->dat, auth->length); | |
976 | ||
977 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB4, &m); | |
978 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB4, &m); | |
979 | ||
980 | success = buffer_get_int(&m); | |
981 | if (success) { | |
982 | *client = buffer_get_string(&m, NULL); | |
983 | p = buffer_get_string(&m, &rlen); | |
984 | if (rlen >= MAX_KTXT_LEN) | |
985 | fatal("%s: reply from monitor too large", __func__); | |
986 | reply->length = rlen; | |
987 | memcpy(reply->dat, p, rlen); | |
988 | memset(p, 0, rlen); | |
989 | xfree(p); | |
990 | } | |
991 | buffer_free(&m); | |
b77a87e5 | 992 | return (success); |
2db9d8aa | 993 | } |
994 | #endif | |
995 | ||
696f6bef | 996 | #ifdef KRB5 |
997 | int | |
998 | mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp) | |
999 | { | |
1000 | krb5_data *tkt, *reply; | |
1001 | Buffer m; | |
1002 | int success; | |
1003 | ||
1004 | debug3("%s entering", __func__); | |
1005 | tkt = (krb5_data *) argp; | |
1006 | reply = (krb5_data *) resp; | |
1007 | ||
1008 | buffer_init(&m); | |
1009 | buffer_put_string(&m, tkt->data, tkt->length); | |
1010 | ||
1011 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m); | |
1012 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m); | |
1013 | ||
1014 | success = buffer_get_int(&m); | |
1015 | if (success) { | |
1016 | u_int len; | |
1017 | ||
1018 | *userp = buffer_get_string(&m, NULL); | |
1019 | reply->data = buffer_get_string(&m, &len); | |
1020 | reply->length = len; | |
1021 | } else { | |
1022 | memset(reply, 0, sizeof(*reply)); | |
1023 | *userp = NULL; | |
1024 | } | |
1025 | ||
1026 | buffer_free(&m); | |
1027 | return (success); | |
1028 | } | |
1029 | #endif |