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127c96db | 1 | /* $OpenBSD: monitor_wrap.c,v 1.68 2009/06/22 05:39:28 dtucker Exp $ */ |
1853d1ef | 2 | /* |
3 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
4 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
28 | #include "includes.h" | |
1853d1ef | 29 | |
b1842393 | 30 | #include <sys/types.h> |
428f6258 | 31 | #include <sys/uio.h> |
b1842393 | 32 | |
028094f4 | 33 | #include <errno.h> |
b1842393 | 34 | #include <pwd.h> |
31652869 | 35 | #include <signal.h> |
24436b92 | 36 | #include <stdarg.h> |
cf851879 | 37 | #include <stdio.h> |
00146caa | 38 | #include <string.h> |
428f6258 | 39 | #include <unistd.h> |
b1842393 | 40 | |
31652869 | 41 | #include <openssl/bn.h> |
42 | #include <openssl/dh.h> | |
5adf6b9a | 43 | #include <openssl/evp.h> |
31652869 | 44 | |
3593bdc0 | 45 | #include "openbsd-compat/sys-queue.h" |
31652869 | 46 | #include "xmalloc.h" |
1853d1ef | 47 | #include "ssh.h" |
48 | #include "dh.h" | |
31652869 | 49 | #include "buffer.h" |
50 | #include "key.h" | |
51 | #include "cipher.h" | |
1853d1ef | 52 | #include "kex.h" |
31652869 | 53 | #include "hostfile.h" |
1853d1ef | 54 | #include "auth.h" |
92e15201 | 55 | #include "auth-options.h" |
1853d1ef | 56 | #include "packet.h" |
57 | #include "mac.h" | |
58 | #include "log.h" | |
a655c012 | 59 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
60 | #undef TARGET_OS_MAC | |
9b08c23f | 61 | #include "zlib.h" |
a655c012 | 62 | #define TARGET_OS_MAC 1 |
63 | #else | |
64 | #include "zlib.h" | |
65 | #endif | |
1853d1ef | 66 | #include "monitor.h" |
31652869 | 67 | #ifdef GSSAPI |
68 | #include "ssh-gss.h" | |
69 | #endif | |
1853d1ef | 70 | #include "monitor_wrap.h" |
1853d1ef | 71 | #include "atomicio.h" |
72 | #include "monitor_fdpass.h" | |
51e7a012 | 73 | #include "misc.h" |
5b01421b | 74 | #include "schnorr.h" |
5adf6b9a | 75 | #include "jpake.h" |
1853d1ef | 76 | |
1853d1ef | 77 | #include "channels.h" |
78 | #include "session.h" | |
03bcbf84 | 79 | #include "servconf.h" |
d0137ef8 | 80 | #include "roaming.h" |
1853d1ef | 81 | |
82 | /* Imports */ | |
83 | extern int compat20; | |
1853d1ef | 84 | extern z_stream incoming_stream; |
85 | extern z_stream outgoing_stream; | |
b5a28cbc | 86 | extern struct monitor *pmonitor; |
be2ca0c9 | 87 | extern Buffer loginmsg; |
7fceb20d | 88 | extern ServerOptions options; |
1853d1ef | 89 | |
2362db19 | 90 | int |
91 | mm_is_monitor(void) | |
92 | { | |
93 | /* | |
94 | * m_pid is only set in the privileged part, and | |
95 | * points to the unprivileged child. | |
96 | */ | |
74677ba3 | 97 | return (pmonitor && pmonitor->m_pid > 0); |
2362db19 | 98 | } |
99 | ||
1853d1ef | 100 | void |
ca75d7de | 101 | mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) |
1853d1ef | 102 | { |
1853d1ef | 103 | u_int mlen = buffer_len(m); |
405a0d43 | 104 | u_char buf[5]; |
1853d1ef | 105 | |
1588c277 | 106 | debug3("%s entering: type %d", __func__, type); |
1853d1ef | 107 | |
51e7a012 | 108 | put_u32(buf, mlen + 1); |
7203d6bb | 109 | buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ |
ca75d7de | 110 | if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) |
05624c18 | 111 | fatal("%s: write: %s", __func__, strerror(errno)); |
ca75d7de | 112 | if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) |
05624c18 | 113 | fatal("%s: write: %s", __func__, strerror(errno)); |
1853d1ef | 114 | } |
115 | ||
116 | void | |
ca75d7de | 117 | mm_request_receive(int sock, Buffer *m) |
1853d1ef | 118 | { |
119 | u_char buf[4]; | |
1853d1ef | 120 | u_int msg_len; |
121 | ||
1588c277 | 122 | debug3("%s entering", __func__); |
1853d1ef | 123 | |
05624c18 | 124 | if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { |
125 | if (errno == EPIPE) | |
2362db19 | 126 | cleanup_exit(255); |
05624c18 | 127 | fatal("%s: read: %s", __func__, strerror(errno)); |
1853d1ef | 128 | } |
51e7a012 | 129 | msg_len = get_u32(buf); |
1853d1ef | 130 | if (msg_len > 256 * 1024) |
1588c277 | 131 | fatal("%s: read: bad msg_len %d", __func__, msg_len); |
1853d1ef | 132 | buffer_clear(m); |
133 | buffer_append_space(m, msg_len); | |
05624c18 | 134 | if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) |
135 | fatal("%s: read: %s", __func__, strerror(errno)); | |
1853d1ef | 136 | } |
137 | ||
138 | void | |
ca75d7de | 139 | mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) |
1853d1ef | 140 | { |
141 | u_char rtype; | |
142 | ||
1588c277 | 143 | debug3("%s entering: type %d", __func__, type); |
1853d1ef | 144 | |
ca75d7de | 145 | mm_request_receive(sock, m); |
1853d1ef | 146 | rtype = buffer_get_char(m); |
147 | if (rtype != type) | |
1588c277 | 148 | fatal("%s: read: rtype %d != type %d", __func__, |
1853d1ef | 149 | rtype, type); |
150 | } | |
151 | ||
152 | DH * | |
153 | mm_choose_dh(int min, int nbits, int max) | |
154 | { | |
155 | BIGNUM *p, *g; | |
156 | int success = 0; | |
157 | Buffer m; | |
158 | ||
159 | buffer_init(&m); | |
160 | buffer_put_int(&m, min); | |
161 | buffer_put_int(&m, nbits); | |
162 | buffer_put_int(&m, max); | |
163 | ||
b5a28cbc | 164 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); |
1853d1ef | 165 | |
1588c277 | 166 | debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); |
b5a28cbc | 167 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); |
1853d1ef | 168 | |
169 | success = buffer_get_char(&m); | |
170 | if (success == 0) | |
1588c277 | 171 | fatal("%s: MONITOR_ANS_MODULI failed", __func__); |
1853d1ef | 172 | |
173 | if ((p = BN_new()) == NULL) | |
1588c277 | 174 | fatal("%s: BN_new failed", __func__); |
1853d1ef | 175 | if ((g = BN_new()) == NULL) |
1588c277 | 176 | fatal("%s: BN_new failed", __func__); |
1853d1ef | 177 | buffer_get_bignum2(&m, p); |
178 | buffer_get_bignum2(&m, g); | |
179 | ||
1588c277 | 180 | debug3("%s: remaining %d", __func__, buffer_len(&m)); |
1853d1ef | 181 | buffer_free(&m); |
182 | ||
183 | return (dh_new_group(g, p)); | |
184 | } | |
185 | ||
186 | int | |
187 | mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) | |
188 | { | |
b5a28cbc | 189 | Kex *kex = *pmonitor->m_pkex; |
1853d1ef | 190 | Buffer m; |
191 | ||
1588c277 | 192 | debug3("%s entering", __func__); |
1853d1ef | 193 | |
194 | buffer_init(&m); | |
195 | buffer_put_int(&m, kex->host_key_index(key)); | |
196 | buffer_put_string(&m, data, datalen); | |
197 | ||
b5a28cbc | 198 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); |
1853d1ef | 199 | |
1588c277 | 200 | debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); |
b5a28cbc | 201 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); |
1853d1ef | 202 | *sigp = buffer_get_string(&m, lenp); |
203 | buffer_free(&m); | |
204 | ||
205 | return (0); | |
206 | } | |
207 | ||
208 | struct passwd * | |
18a8f313 | 209 | mm_getpwnamallow(const char *username) |
1853d1ef | 210 | { |
211 | Buffer m; | |
212 | struct passwd *pw; | |
03bcbf84 | 213 | u_int len; |
214 | ServerOptions *newopts; | |
1853d1ef | 215 | |
1588c277 | 216 | debug3("%s entering", __func__); |
1853d1ef | 217 | |
218 | buffer_init(&m); | |
18a8f313 | 219 | buffer_put_cstring(&m, username); |
1853d1ef | 220 | |
b5a28cbc | 221 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); |
1853d1ef | 222 | |
1588c277 | 223 | debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); |
b5a28cbc | 224 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); |
1853d1ef | 225 | |
226 | if (buffer_get_char(&m) == 0) { | |
dc0cae51 | 227 | pw = NULL; |
228 | goto out; | |
1853d1ef | 229 | } |
03bcbf84 | 230 | pw = buffer_get_string(&m, &len); |
231 | if (len != sizeof(struct passwd)) | |
1588c277 | 232 | fatal("%s: struct passwd size mismatch", __func__); |
1853d1ef | 233 | pw->pw_name = buffer_get_string(&m, NULL); |
234 | pw->pw_passwd = buffer_get_string(&m, NULL); | |
235 | pw->pw_gecos = buffer_get_string(&m, NULL); | |
7b18c353 | 236 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 237 | pw->pw_class = buffer_get_string(&m, NULL); |
7b18c353 | 238 | #endif |
1853d1ef | 239 | pw->pw_dir = buffer_get_string(&m, NULL); |
240 | pw->pw_shell = buffer_get_string(&m, NULL); | |
03bcbf84 | 241 | |
dc0cae51 | 242 | out: |
03bcbf84 | 243 | /* copy options block as a Match directive may have changed some */ |
244 | newopts = buffer_get_string(&m, &len); | |
245 | if (len != sizeof(*newopts)) | |
246 | fatal("%s: option block size mismatch", __func__); | |
247 | if (newopts->banner != NULL) | |
248 | newopts->banner = buffer_get_string(&m, NULL); | |
249 | copy_set_server_options(&options, newopts, 1); | |
250 | xfree(newopts); | |
251 | ||
1853d1ef | 252 | buffer_free(&m); |
253 | ||
254 | return (pw); | |
255 | } | |
256 | ||
02cd6c56 | 257 | char * |
258 | mm_auth2_read_banner(void) | |
94a73cdc | 259 | { |
260 | Buffer m; | |
261 | char *banner; | |
262 | ||
1588c277 | 263 | debug3("%s entering", __func__); |
94a73cdc | 264 | |
265 | buffer_init(&m); | |
b5a28cbc | 266 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); |
94a73cdc | 267 | buffer_clear(&m); |
268 | ||
02cd6c56 | 269 | mm_request_receive_expect(pmonitor->m_recvfd, |
270 | MONITOR_ANS_AUTH2_READ_BANNER, &m); | |
94a73cdc | 271 | banner = buffer_get_string(&m, NULL); |
272 | buffer_free(&m); | |
7203d6bb | 273 | |
02cd6c56 | 274 | /* treat empty banner as missing banner */ |
275 | if (strlen(banner) == 0) { | |
276 | xfree(banner); | |
277 | banner = NULL; | |
278 | } | |
94a73cdc | 279 | return (banner); |
280 | } | |
281 | ||
1853d1ef | 282 | /* Inform the privileged process about service and style */ |
283 | ||
284 | void | |
285 | mm_inform_authserv(char *service, char *style) | |
286 | { | |
287 | Buffer m; | |
288 | ||
1588c277 | 289 | debug3("%s entering", __func__); |
1853d1ef | 290 | |
291 | buffer_init(&m); | |
292 | buffer_put_cstring(&m, service); | |
293 | buffer_put_cstring(&m, style ? style : ""); | |
294 | ||
b5a28cbc | 295 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); |
1853d1ef | 296 | |
297 | buffer_free(&m); | |
298 | } | |
299 | ||
300 | /* Do the password authentication */ | |
301 | int | |
302 | mm_auth_password(Authctxt *authctxt, char *password) | |
303 | { | |
304 | Buffer m; | |
305 | int authenticated = 0; | |
306 | ||
1588c277 | 307 | debug3("%s entering", __func__); |
1853d1ef | 308 | |
309 | buffer_init(&m); | |
310 | buffer_put_cstring(&m, password); | |
b5a28cbc | 311 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); |
1853d1ef | 312 | |
1588c277 | 313 | debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); |
b5a28cbc | 314 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); |
1853d1ef | 315 | |
316 | authenticated = buffer_get_int(&m); | |
317 | ||
318 | buffer_free(&m); | |
319 | ||
320 | debug3("%s: user %sauthenticated", | |
1588c277 | 321 | __func__, authenticated ? "" : "not "); |
1853d1ef | 322 | return (authenticated); |
323 | } | |
324 | ||
325 | int | |
326 | mm_user_key_allowed(struct passwd *pw, Key *key) | |
327 | { | |
328 | return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); | |
329 | } | |
330 | ||
331 | int | |
332 | mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, | |
333 | Key *key) | |
334 | { | |
335 | return (mm_key_allowed(MM_HOSTKEY, user, host, key)); | |
336 | } | |
337 | ||
338 | int | |
339 | mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, | |
340 | char *host, Key *key) | |
341 | { | |
342 | int ret; | |
343 | ||
344 | key->type = KEY_RSA; /* XXX hack for key_to_blob */ | |
345 | ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); | |
346 | key->type = KEY_RSA1; | |
347 | return (ret); | |
348 | } | |
349 | ||
350 | static void | |
351 | mm_send_debug(Buffer *m) | |
352 | { | |
353 | char *msg; | |
354 | ||
355 | while (buffer_len(m)) { | |
356 | msg = buffer_get_string(m, NULL); | |
1588c277 | 357 | debug3("%s: Sending debug: %s", __func__, msg); |
1853d1ef | 358 | packet_send_debug("%s", msg); |
359 | xfree(msg); | |
360 | } | |
361 | } | |
362 | ||
363 | int | |
364 | mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) | |
365 | { | |
366 | Buffer m; | |
367 | u_char *blob; | |
368 | u_int len; | |
92e15201 | 369 | int allowed = 0, have_forced = 0; |
1853d1ef | 370 | |
1588c277 | 371 | debug3("%s entering", __func__); |
1853d1ef | 372 | |
373 | /* Convert the key to a blob and the pass it over */ | |
374 | if (!key_to_blob(key, &blob, &len)) | |
375 | return (0); | |
376 | ||
377 | buffer_init(&m); | |
378 | buffer_put_int(&m, type); | |
379 | buffer_put_cstring(&m, user ? user : ""); | |
380 | buffer_put_cstring(&m, host ? host : ""); | |
381 | buffer_put_string(&m, blob, len); | |
382 | xfree(blob); | |
383 | ||
b5a28cbc | 384 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); |
1853d1ef | 385 | |
1588c277 | 386 | debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); |
b5a28cbc | 387 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); |
1853d1ef | 388 | |
389 | allowed = buffer_get_int(&m); | |
390 | ||
92e15201 | 391 | /* fake forced command */ |
392 | auth_clear_options(); | |
393 | have_forced = buffer_get_int(&m); | |
394 | forced_command = have_forced ? xstrdup("true") : NULL; | |
395 | ||
1853d1ef | 396 | /* Send potential debug messages */ |
397 | mm_send_debug(&m); | |
398 | ||
399 | buffer_free(&m); | |
400 | ||
401 | return (allowed); | |
402 | } | |
403 | ||
404 | /* | |
405 | * This key verify needs to send the key type along, because the | |
406 | * privileged parent makes the decision if the key is allowed | |
407 | * for authentication. | |
408 | */ | |
409 | ||
410 | int | |
411 | mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) | |
412 | { | |
413 | Buffer m; | |
414 | u_char *blob; | |
415 | u_int len; | |
416 | int verified = 0; | |
417 | ||
1588c277 | 418 | debug3("%s entering", __func__); |
1853d1ef | 419 | |
420 | /* Convert the key to a blob and the pass it over */ | |
421 | if (!key_to_blob(key, &blob, &len)) | |
422 | return (0); | |
423 | ||
424 | buffer_init(&m); | |
425 | buffer_put_string(&m, blob, len); | |
426 | buffer_put_string(&m, sig, siglen); | |
427 | buffer_put_string(&m, data, datalen); | |
428 | xfree(blob); | |
429 | ||
b5a28cbc | 430 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); |
1853d1ef | 431 | |
1588c277 | 432 | debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); |
b5a28cbc | 433 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); |
1853d1ef | 434 | |
435 | verified = buffer_get_int(&m); | |
436 | ||
437 | buffer_free(&m); | |
438 | ||
439 | return (verified); | |
440 | } | |
441 | ||
442 | /* Export key state after authentication */ | |
443 | Newkeys * | |
444 | mm_newkeys_from_blob(u_char *blob, int blen) | |
445 | { | |
446 | Buffer b; | |
447 | u_int len; | |
448 | Newkeys *newkey = NULL; | |
449 | Enc *enc; | |
450 | Mac *mac; | |
451 | Comp *comp; | |
452 | ||
1588c277 | 453 | debug3("%s: %p(%d)", __func__, blob, blen); |
1853d1ef | 454 | #ifdef DEBUG_PK |
455 | dump_base64(stderr, blob, blen); | |
456 | #endif | |
457 | buffer_init(&b); | |
458 | buffer_append(&b, blob, blen); | |
459 | ||
460 | newkey = xmalloc(sizeof(*newkey)); | |
461 | enc = &newkey->enc; | |
462 | mac = &newkey->mac; | |
463 | comp = &newkey->comp; | |
464 | ||
465 | /* Enc structure */ | |
466 | enc->name = buffer_get_string(&b, NULL); | |
467 | buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); | |
468 | enc->enabled = buffer_get_int(&b); | |
469 | enc->block_size = buffer_get_int(&b); | |
470 | enc->key = buffer_get_string(&b, &enc->key_len); | |
471 | enc->iv = buffer_get_string(&b, &len); | |
472 | if (len != enc->block_size) | |
bb0640b2 | 473 | fatal("%s: bad ivlen: expected %u != %u", __func__, |
1853d1ef | 474 | enc->block_size, len); |
475 | ||
476 | if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) | |
1588c277 | 477 | fatal("%s: bad cipher name %s or pointer %p", __func__, |
1853d1ef | 478 | enc->name, enc->cipher); |
479 | ||
480 | /* Mac structure */ | |
481 | mac->name = buffer_get_string(&b, NULL); | |
a3de8da1 | 482 | if (mac->name == NULL || mac_setup(mac, mac->name) == -1) |
f444d0f8 | 483 | fatal("%s: can not setup mac %s", __func__, mac->name); |
1853d1ef | 484 | mac->enabled = buffer_get_int(&b); |
485 | mac->key = buffer_get_string(&b, &len); | |
486 | if (len > mac->key_len) | |
bb0640b2 | 487 | fatal("%s: bad mac key length: %u > %d", __func__, len, |
1853d1ef | 488 | mac->key_len); |
489 | mac->key_len = len; | |
490 | ||
491 | /* Comp structure */ | |
492 | comp->type = buffer_get_int(&b); | |
493 | comp->enabled = buffer_get_int(&b); | |
494 | comp->name = buffer_get_string(&b, NULL); | |
495 | ||
496 | len = buffer_len(&b); | |
497 | if (len != 0) | |
bb0640b2 | 498 | error("newkeys_from_blob: remaining bytes in blob %u", len); |
1853d1ef | 499 | buffer_free(&b); |
500 | return (newkey); | |
501 | } | |
502 | ||
503 | int | |
504 | mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) | |
505 | { | |
506 | Buffer b; | |
507 | int len; | |
1853d1ef | 508 | Enc *enc; |
509 | Mac *mac; | |
510 | Comp *comp; | |
dc1f1948 | 511 | Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode); |
1853d1ef | 512 | |
1588c277 | 513 | debug3("%s: converting %p", __func__, newkey); |
1853d1ef | 514 | |
515 | if (newkey == NULL) { | |
1588c277 | 516 | error("%s: newkey == NULL", __func__); |
1853d1ef | 517 | return 0; |
518 | } | |
519 | enc = &newkey->enc; | |
520 | mac = &newkey->mac; | |
521 | comp = &newkey->comp; | |
522 | ||
523 | buffer_init(&b); | |
524 | /* Enc structure */ | |
525 | buffer_put_cstring(&b, enc->name); | |
526 | /* The cipher struct is constant and shared, you export pointer */ | |
527 | buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); | |
528 | buffer_put_int(&b, enc->enabled); | |
529 | buffer_put_int(&b, enc->block_size); | |
530 | buffer_put_string(&b, enc->key, enc->key_len); | |
531 | packet_get_keyiv(mode, enc->iv, enc->block_size); | |
532 | buffer_put_string(&b, enc->iv, enc->block_size); | |
533 | ||
534 | /* Mac structure */ | |
535 | buffer_put_cstring(&b, mac->name); | |
536 | buffer_put_int(&b, mac->enabled); | |
537 | buffer_put_string(&b, mac->key, mac->key_len); | |
538 | ||
539 | /* Comp structure */ | |
540 | buffer_put_int(&b, comp->type); | |
541 | buffer_put_int(&b, comp->enabled); | |
542 | buffer_put_cstring(&b, comp->name); | |
543 | ||
544 | len = buffer_len(&b); | |
1853d1ef | 545 | if (lenp != NULL) |
546 | *lenp = len; | |
eb9f2fab | 547 | if (blobp != NULL) { |
548 | *blobp = xmalloc(len); | |
549 | memcpy(*blobp, buffer_ptr(&b), len); | |
550 | } | |
551 | memset(buffer_ptr(&b), 0, len); | |
552 | buffer_free(&b); | |
1853d1ef | 553 | return len; |
554 | } | |
555 | ||
556 | static void | |
557 | mm_send_kex(Buffer *m, Kex *kex) | |
558 | { | |
559 | buffer_put_string(m, kex->session_id, kex->session_id_len); | |
560 | buffer_put_int(m, kex->we_need); | |
561 | buffer_put_int(m, kex->hostkey_type); | |
562 | buffer_put_int(m, kex->kex_type); | |
563 | buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); | |
564 | buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); | |
565 | buffer_put_int(m, kex->flags); | |
566 | buffer_put_cstring(m, kex->client_version_string); | |
567 | buffer_put_cstring(m, kex->server_version_string); | |
568 | } | |
569 | ||
570 | void | |
ca75d7de | 571 | mm_send_keystate(struct monitor *monitor) |
1853d1ef | 572 | { |
dc1f1948 | 573 | Buffer m, *input, *output; |
1853d1ef | 574 | u_char *blob, *p; |
575 | u_int bloblen, plen; | |
ffd7b36b | 576 | u_int32_t seqnr, packets; |
e8e08a80 | 577 | u_int64_t blocks, bytes; |
1853d1ef | 578 | |
579 | buffer_init(&m); | |
580 | ||
581 | if (!compat20) { | |
582 | u_char iv[24]; | |
9459414c | 583 | u_char *key; |
584 | u_int ivlen, keylen; | |
1853d1ef | 585 | |
586 | buffer_put_int(&m, packet_get_protocol_flags()); | |
587 | ||
588 | buffer_put_int(&m, packet_get_ssh1_cipher()); | |
589 | ||
9459414c | 590 | debug3("%s: Sending ssh1 KEY+IV", __func__); |
591 | keylen = packet_get_encryption_key(NULL); | |
592 | key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ | |
593 | keylen = packet_get_encryption_key(key); | |
594 | buffer_put_string(&m, key, keylen); | |
595 | memset(key, 0, keylen); | |
596 | xfree(key); | |
597 | ||
1853d1ef | 598 | ivlen = packet_get_keyiv_len(MODE_OUT); |
599 | packet_get_keyiv(MODE_OUT, iv, ivlen); | |
600 | buffer_put_string(&m, iv, ivlen); | |
601 | ivlen = packet_get_keyiv_len(MODE_OUT); | |
602 | packet_get_keyiv(MODE_IN, iv, ivlen); | |
603 | buffer_put_string(&m, iv, ivlen); | |
604 | goto skip; | |
605 | } else { | |
606 | /* Kex for rekeying */ | |
ca75d7de | 607 | mm_send_kex(&m, *monitor->m_pkex); |
1853d1ef | 608 | } |
609 | ||
610 | debug3("%s: Sending new keys: %p %p", | |
dc1f1948 | 611 | __func__, packet_get_newkeys(MODE_OUT), |
612 | packet_get_newkeys(MODE_IN)); | |
1853d1ef | 613 | |
614 | /* Keys from Kex */ | |
615 | if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) | |
1588c277 | 616 | fatal("%s: conversion of newkeys failed", __func__); |
1853d1ef | 617 | |
618 | buffer_put_string(&m, blob, bloblen); | |
619 | xfree(blob); | |
620 | ||
621 | if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) | |
1588c277 | 622 | fatal("%s: conversion of newkeys failed", __func__); |
1853d1ef | 623 | |
624 | buffer_put_string(&m, blob, bloblen); | |
625 | xfree(blob); | |
626 | ||
e8e08a80 | 627 | packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); |
ffd7b36b | 628 | buffer_put_int(&m, seqnr); |
629 | buffer_put_int64(&m, blocks); | |
630 | buffer_put_int(&m, packets); | |
e8e08a80 | 631 | buffer_put_int64(&m, bytes); |
632 | packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); | |
ffd7b36b | 633 | buffer_put_int(&m, seqnr); |
634 | buffer_put_int64(&m, blocks); | |
635 | buffer_put_int(&m, packets); | |
e8e08a80 | 636 | buffer_put_int64(&m, bytes); |
1853d1ef | 637 | |
1588c277 | 638 | debug3("%s: New keys have been sent", __func__); |
1853d1ef | 639 | skip: |
640 | /* More key context */ | |
641 | plen = packet_get_keycontext(MODE_OUT, NULL); | |
642 | p = xmalloc(plen+1); | |
643 | packet_get_keycontext(MODE_OUT, p); | |
644 | buffer_put_string(&m, p, plen); | |
645 | xfree(p); | |
646 | ||
647 | plen = packet_get_keycontext(MODE_IN, NULL); | |
648 | p = xmalloc(plen+1); | |
649 | packet_get_keycontext(MODE_IN, p); | |
650 | buffer_put_string(&m, p, plen); | |
651 | xfree(p); | |
652 | ||
653 | /* Compression state */ | |
1588c277 | 654 | debug3("%s: Sending compression state", __func__); |
1853d1ef | 655 | buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); |
656 | buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); | |
657 | ||
658 | /* Network I/O buffers */ | |
dc1f1948 | 659 | input = (Buffer *)packet_get_input(); |
660 | output = (Buffer *)packet_get_output(); | |
661 | buffer_put_string(&m, buffer_ptr(input), buffer_len(input)); | |
662 | buffer_put_string(&m, buffer_ptr(output), buffer_len(output)); | |
1853d1ef | 663 | |
d0137ef8 | 664 | /* Roaming */ |
665 | if (compat20) { | |
666 | buffer_put_int64(&m, get_sent_bytes()); | |
667 | buffer_put_int64(&m, get_recv_bytes()); | |
668 | } | |
669 | ||
ca75d7de | 670 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); |
1588c277 | 671 | debug3("%s: Finished sending state", __func__); |
1853d1ef | 672 | |
673 | buffer_free(&m); | |
674 | } | |
675 | ||
676 | int | |
148de80c | 677 | mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) |
1853d1ef | 678 | { |
679 | Buffer m; | |
be2ca0c9 | 680 | char *p, *msg; |
c6dca55e | 681 | int success = 0, tmp1 = -1, tmp2 = -1; |
682 | ||
683 | /* Kludge: ensure there are fds free to receive the pty/tty */ | |
684 | if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || | |
685 | (tmp2 = dup(pmonitor->m_recvfd)) == -1) { | |
686 | error("%s: cannot allocate fds for pty", __func__); | |
687 | if (tmp1 > 0) | |
688 | close(tmp1); | |
689 | if (tmp2 > 0) | |
690 | close(tmp2); | |
691 | return 0; | |
692 | } | |
693 | close(tmp1); | |
694 | close(tmp2); | |
1853d1ef | 695 | |
696 | buffer_init(&m); | |
b5a28cbc | 697 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); |
1853d1ef | 698 | |
1588c277 | 699 | debug3("%s: waiting for MONITOR_ANS_PTY", __func__); |
b5a28cbc | 700 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); |
1853d1ef | 701 | |
702 | success = buffer_get_int(&m); | |
703 | if (success == 0) { | |
1588c277 | 704 | debug3("%s: pty alloc failed", __func__); |
1853d1ef | 705 | buffer_free(&m); |
706 | return (0); | |
707 | } | |
708 | p = buffer_get_string(&m, NULL); | |
be2ca0c9 | 709 | msg = buffer_get_string(&m, NULL); |
1853d1ef | 710 | buffer_free(&m); |
711 | ||
712 | strlcpy(namebuf, p, namebuflen); /* Possible truncation */ | |
713 | xfree(p); | |
714 | ||
be2ca0c9 | 715 | buffer_append(&loginmsg, msg, strlen(msg)); |
716 | xfree(msg); | |
717 | ||
8de7aaab | 718 | if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || |
719 | (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) | |
720 | fatal("%s: receive fds failed", __func__); | |
1853d1ef | 721 | |
722 | /* Success */ | |
723 | return (1); | |
724 | } | |
725 | ||
726 | void | |
2362db19 | 727 | mm_session_pty_cleanup2(Session *s) |
1853d1ef | 728 | { |
1853d1ef | 729 | Buffer m; |
730 | ||
731 | if (s->ttyfd == -1) | |
732 | return; | |
733 | buffer_init(&m); | |
734 | buffer_put_cstring(&m, s->tty); | |
b5a28cbc | 735 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); |
1853d1ef | 736 | buffer_free(&m); |
737 | ||
738 | /* closed dup'ed master */ | |
c6dca55e | 739 | if (s->ptymaster != -1 && close(s->ptymaster) < 0) |
740 | error("close(s->ptymaster/%d): %s", | |
741 | s->ptymaster, strerror(errno)); | |
1853d1ef | 742 | |
743 | /* unlink pty from session */ | |
744 | s->ttyfd = -1; | |
745 | } | |
746 | ||
ad200abb | 747 | #ifdef USE_PAM |
748 | void | |
529d73ab | 749 | mm_start_pam(Authctxt *authctxt) |
ad200abb | 750 | { |
751 | Buffer m; | |
752 | ||
1588c277 | 753 | debug3("%s entering", __func__); |
7fceb20d | 754 | if (!options.use_pam) |
755 | fatal("UsePAM=no, but ended up in %s anyway", __func__); | |
ad200abb | 756 | |
757 | buffer_init(&m); | |
b5a28cbc | 758 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); |
ad200abb | 759 | |
760 | buffer_free(&m); | |
761 | } | |
05114c74 | 762 | |
5b9e2464 | 763 | u_int |
764 | mm_do_pam_account(void) | |
765 | { | |
766 | Buffer m; | |
767 | u_int ret; | |
ba6dd90e | 768 | char *msg; |
5b9e2464 | 769 | |
770 | debug3("%s entering", __func__); | |
771 | if (!options.use_pam) | |
772 | fatal("UsePAM=no, but ended up in %s anyway", __func__); | |
773 | ||
774 | buffer_init(&m); | |
775 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); | |
776 | ||
aff51935 | 777 | mm_request_receive_expect(pmonitor->m_recvfd, |
5b9e2464 | 778 | MONITOR_ANS_PAM_ACCOUNT, &m); |
779 | ret = buffer_get_int(&m); | |
ba6dd90e | 780 | msg = buffer_get_string(&m, NULL); |
781 | buffer_append(&loginmsg, msg, strlen(msg)); | |
782 | xfree(msg); | |
5b9e2464 | 783 | |
784 | buffer_free(&m); | |
b6453d99 | 785 | |
5b9e2464 | 786 | debug3("%s returning %d", __func__, ret); |
787 | ||
788 | return (ret); | |
789 | } | |
790 | ||
05114c74 | 791 | void * |
792 | mm_sshpam_init_ctx(Authctxt *authctxt) | |
793 | { | |
794 | Buffer m; | |
795 | int success; | |
796 | ||
797 | debug3("%s", __func__); | |
798 | buffer_init(&m); | |
799 | buffer_put_cstring(&m, authctxt->user); | |
800 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); | |
801 | debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); | |
802 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); | |
803 | success = buffer_get_int(&m); | |
804 | if (success == 0) { | |
805 | debug3("%s: pam_init_ctx failed", __func__); | |
806 | buffer_free(&m); | |
807 | return (NULL); | |
808 | } | |
809 | buffer_free(&m); | |
810 | return (authctxt); | |
811 | } | |
812 | ||
813 | int | |
814 | mm_sshpam_query(void *ctx, char **name, char **info, | |
815 | u_int *num, char ***prompts, u_int **echo_on) | |
816 | { | |
817 | Buffer m; | |
a1a073cc | 818 | u_int i; |
819 | int ret; | |
05114c74 | 820 | |
821 | debug3("%s", __func__); | |
822 | buffer_init(&m); | |
823 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); | |
824 | debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); | |
825 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); | |
826 | ret = buffer_get_int(&m); | |
827 | debug3("%s: pam_query returned %d", __func__, ret); | |
828 | *name = buffer_get_string(&m, NULL); | |
829 | *info = buffer_get_string(&m, NULL); | |
830 | *num = buffer_get_int(&m); | |
01d35895 | 831 | if (*num > PAM_MAX_NUM_MSG) |
832 | fatal("%s: recieved %u PAM messages, expected <= %u", | |
833 | __func__, *num, PAM_MAX_NUM_MSG); | |
834 | *prompts = xcalloc((*num + 1), sizeof(char *)); | |
835 | *echo_on = xcalloc((*num + 1), sizeof(u_int)); | |
05114c74 | 836 | for (i = 0; i < *num; ++i) { |
837 | (*prompts)[i] = buffer_get_string(&m, NULL); | |
838 | (*echo_on)[i] = buffer_get_int(&m); | |
839 | } | |
840 | buffer_free(&m); | |
841 | return (ret); | |
842 | } | |
843 | ||
844 | int | |
845 | mm_sshpam_respond(void *ctx, u_int num, char **resp) | |
846 | { | |
847 | Buffer m; | |
a1a073cc | 848 | u_int i; |
849 | int ret; | |
05114c74 | 850 | |
851 | debug3("%s", __func__); | |
852 | buffer_init(&m); | |
853 | buffer_put_int(&m, num); | |
854 | for (i = 0; i < num; ++i) | |
855 | buffer_put_cstring(&m, resp[i]); | |
856 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); | |
857 | debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); | |
858 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); | |
859 | ret = buffer_get_int(&m); | |
860 | debug3("%s: pam_respond returned %d", __func__, ret); | |
861 | buffer_free(&m); | |
862 | return (ret); | |
863 | } | |
864 | ||
865 | void | |
866 | mm_sshpam_free_ctx(void *ctxtp) | |
867 | { | |
868 | Buffer m; | |
869 | ||
870 | debug3("%s", __func__); | |
871 | buffer_init(&m); | |
872 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); | |
873 | debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); | |
874 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); | |
875 | buffer_free(&m); | |
876 | } | |
ad200abb | 877 | #endif /* USE_PAM */ |
878 | ||
1853d1ef | 879 | /* Request process termination */ |
880 | ||
881 | void | |
882 | mm_terminate(void) | |
883 | { | |
884 | Buffer m; | |
885 | ||
886 | buffer_init(&m); | |
b5a28cbc | 887 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); |
1853d1ef | 888 | buffer_free(&m); |
889 | } | |
890 | ||
891 | int | |
892 | mm_ssh1_session_key(BIGNUM *num) | |
893 | { | |
894 | int rsafail; | |
895 | Buffer m; | |
896 | ||
897 | buffer_init(&m); | |
898 | buffer_put_bignum2(&m, num); | |
b5a28cbc | 899 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); |
1853d1ef | 900 | |
b5a28cbc | 901 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); |
1853d1ef | 902 | |
903 | rsafail = buffer_get_int(&m); | |
904 | buffer_get_bignum2(&m, num); | |
905 | ||
906 | buffer_free(&m); | |
907 | ||
908 | return (rsafail); | |
909 | } | |
910 | ||
911 | static void | |
912 | mm_chall_setup(char **name, char **infotxt, u_int *numprompts, | |
913 | char ***prompts, u_int **echo_on) | |
914 | { | |
7203d6bb | 915 | *name = xstrdup(""); |
916 | *infotxt = xstrdup(""); | |
1853d1ef | 917 | *numprompts = 1; |
52e3daed | 918 | *prompts = xcalloc(*numprompts, sizeof(char *)); |
919 | *echo_on = xcalloc(*numprompts, sizeof(u_int)); | |
1853d1ef | 920 | (*echo_on)[0] = 0; |
921 | } | |
922 | ||
923 | int | |
924 | mm_bsdauth_query(void *ctx, char **name, char **infotxt, | |
925 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
926 | { | |
927 | Buffer m; | |
6d6c25e3 | 928 | u_int success; |
1853d1ef | 929 | char *challenge; |
930 | ||
1588c277 | 931 | debug3("%s: entering", __func__); |
1853d1ef | 932 | |
933 | buffer_init(&m); | |
b5a28cbc | 934 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); |
1853d1ef | 935 | |
b5a28cbc | 936 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, |
1853d1ef | 937 | &m); |
6d6c25e3 | 938 | success = buffer_get_int(&m); |
939 | if (success == 0) { | |
1588c277 | 940 | debug3("%s: no challenge", __func__); |
1853d1ef | 941 | buffer_free(&m); |
942 | return (-1); | |
943 | } | |
944 | ||
945 | /* Get the challenge, and format the response */ | |
946 | challenge = buffer_get_string(&m, NULL); | |
947 | buffer_free(&m); | |
948 | ||
949 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
950 | (*prompts)[0] = challenge; | |
951 | ||
1588c277 | 952 | debug3("%s: received challenge: %s", __func__, challenge); |
1853d1ef | 953 | |
954 | return (0); | |
955 | } | |
956 | ||
957 | int | |
958 | mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) | |
959 | { | |
960 | Buffer m; | |
961 | int authok; | |
962 | ||
1588c277 | 963 | debug3("%s: entering", __func__); |
1853d1ef | 964 | if (numresponses != 1) |
965 | return (-1); | |
966 | ||
967 | buffer_init(&m); | |
968 | buffer_put_cstring(&m, responses[0]); | |
b5a28cbc | 969 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); |
1853d1ef | 970 | |
b5a28cbc | 971 | mm_request_receive_expect(pmonitor->m_recvfd, |
1853d1ef | 972 | MONITOR_ANS_BSDAUTHRESPOND, &m); |
973 | ||
974 | authok = buffer_get_int(&m); | |
975 | buffer_free(&m); | |
976 | ||
977 | return ((authok == 0) ? -1 : 0); | |
978 | } | |
979 | ||
77751377 | 980 | #ifdef SKEY |
1853d1ef | 981 | int |
982 | mm_skey_query(void *ctx, char **name, char **infotxt, | |
983 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
984 | { | |
985 | Buffer m; | |
6d6c25e3 | 986 | u_int success; |
cecc422f | 987 | char *challenge; |
1853d1ef | 988 | |
1588c277 | 989 | debug3("%s: entering", __func__); |
1853d1ef | 990 | |
991 | buffer_init(&m); | |
b5a28cbc | 992 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); |
1853d1ef | 993 | |
b5a28cbc | 994 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, |
1853d1ef | 995 | &m); |
6d6c25e3 | 996 | success = buffer_get_int(&m); |
997 | if (success == 0) { | |
1588c277 | 998 | debug3("%s: no challenge", __func__); |
1853d1ef | 999 | buffer_free(&m); |
1000 | return (-1); | |
1001 | } | |
1002 | ||
1003 | /* Get the challenge, and format the response */ | |
1004 | challenge = buffer_get_string(&m, NULL); | |
1005 | buffer_free(&m); | |
1006 | ||
1588c277 | 1007 | debug3("%s: received challenge: %s", __func__, challenge); |
1853d1ef | 1008 | |
1009 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
1010 | ||
52e3daed | 1011 | xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); |
1853d1ef | 1012 | xfree(challenge); |
1013 | ||
1014 | return (0); | |
1015 | } | |
1016 | ||
1017 | int | |
1018 | mm_skey_respond(void *ctx, u_int numresponses, char **responses) | |
1019 | { | |
1020 | Buffer m; | |
1021 | int authok; | |
1022 | ||
1588c277 | 1023 | debug3("%s: entering", __func__); |
1853d1ef | 1024 | if (numresponses != 1) |
1025 | return (-1); | |
1026 | ||
1027 | buffer_init(&m); | |
1028 | buffer_put_cstring(&m, responses[0]); | |
b5a28cbc | 1029 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); |
1853d1ef | 1030 | |
b5a28cbc | 1031 | mm_request_receive_expect(pmonitor->m_recvfd, |
1853d1ef | 1032 | MONITOR_ANS_SKEYRESPOND, &m); |
1033 | ||
1034 | authok = buffer_get_int(&m); | |
1035 | buffer_free(&m); | |
1036 | ||
1037 | return ((authok == 0) ? -1 : 0); | |
1038 | } | |
77751377 | 1039 | #endif /* SKEY */ |
1853d1ef | 1040 | |
1041 | void | |
1042 | mm_ssh1_session_id(u_char session_id[16]) | |
1043 | { | |
1044 | Buffer m; | |
1045 | int i; | |
1046 | ||
1588c277 | 1047 | debug3("%s entering", __func__); |
1853d1ef | 1048 | |
1049 | buffer_init(&m); | |
1050 | for (i = 0; i < 16; i++) | |
1051 | buffer_put_char(&m, session_id[i]); | |
1052 | ||
b5a28cbc | 1053 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); |
1853d1ef | 1054 | buffer_free(&m); |
1055 | } | |
1056 | ||
1057 | int | |
1058 | mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) | |
1059 | { | |
1060 | Buffer m; | |
1061 | Key *key; | |
1062 | u_char *blob; | |
1063 | u_int blen; | |
92e15201 | 1064 | int allowed = 0, have_forced = 0; |
1853d1ef | 1065 | |
1588c277 | 1066 | debug3("%s entering", __func__); |
1853d1ef | 1067 | |
1068 | buffer_init(&m); | |
1069 | buffer_put_bignum2(&m, client_n); | |
1070 | ||
b5a28cbc | 1071 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); |
1072 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); | |
1853d1ef | 1073 | |
1074 | allowed = buffer_get_int(&m); | |
1075 | ||
92e15201 | 1076 | /* fake forced command */ |
1077 | auth_clear_options(); | |
1078 | have_forced = buffer_get_int(&m); | |
1079 | forced_command = have_forced ? xstrdup("true") : NULL; | |
1080 | ||
1853d1ef | 1081 | if (allowed && rkey != NULL) { |
1082 | blob = buffer_get_string(&m, &blen); | |
1083 | if ((key = key_from_blob(blob, blen)) == NULL) | |
1588c277 | 1084 | fatal("%s: key_from_blob failed", __func__); |
1853d1ef | 1085 | *rkey = key; |
1086 | xfree(blob); | |
1087 | } | |
1088 | mm_send_debug(&m); | |
1089 | buffer_free(&m); | |
1090 | ||
1091 | return (allowed); | |
1092 | } | |
1093 | ||
1094 | BIGNUM * | |
1095 | mm_auth_rsa_generate_challenge(Key *key) | |
1096 | { | |
1097 | Buffer m; | |
1098 | BIGNUM *challenge; | |
1099 | u_char *blob; | |
1100 | u_int blen; | |
1101 | ||
1588c277 | 1102 | debug3("%s entering", __func__); |
1853d1ef | 1103 | |
1104 | if ((challenge = BN_new()) == NULL) | |
1588c277 | 1105 | fatal("%s: BN_new failed", __func__); |
1853d1ef | 1106 | |
1107 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
1108 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1109 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1110 | key->type = KEY_RSA1; |
1111 | ||
1112 | buffer_init(&m); | |
1113 | buffer_put_string(&m, blob, blen); | |
1114 | xfree(blob); | |
1115 | ||
b5a28cbc | 1116 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); |
1117 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); | |
1853d1ef | 1118 | |
1119 | buffer_get_bignum2(&m, challenge); | |
1120 | buffer_free(&m); | |
1121 | ||
1122 | return (challenge); | |
1123 | } | |
1124 | ||
1125 | int | |
1126 | mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) | |
1127 | { | |
1128 | Buffer m; | |
1129 | u_char *blob; | |
1130 | u_int blen; | |
1131 | int success = 0; | |
1132 | ||
1588c277 | 1133 | debug3("%s entering", __func__); |
1853d1ef | 1134 | |
1135 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
1136 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1137 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1138 | key->type = KEY_RSA1; |
1139 | ||
1140 | buffer_init(&m); | |
1141 | buffer_put_string(&m, blob, blen); | |
1142 | buffer_put_string(&m, response, 16); | |
1143 | xfree(blob); | |
1144 | ||
b5a28cbc | 1145 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); |
1146 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); | |
1853d1ef | 1147 | |
1148 | success = buffer_get_int(&m); | |
1149 | buffer_free(&m); | |
1150 | ||
1151 | return (success); | |
1152 | } | |
696f6bef | 1153 | |
6039eeef | 1154 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1155 | void |
1156 | mm_audit_event(ssh_audit_event_t event) | |
1157 | { | |
1158 | Buffer m; | |
1159 | ||
1160 | debug3("%s entering", __func__); | |
1161 | ||
1162 | buffer_init(&m); | |
1163 | buffer_put_int(&m, event); | |
1164 | ||
1165 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); | |
1166 | buffer_free(&m); | |
1167 | } | |
1168 | ||
1169 | void | |
1170 | mm_audit_run_command(const char *command) | |
1171 | { | |
1172 | Buffer m; | |
1173 | ||
1174 | debug3("%s entering command %s", __func__, command); | |
1175 | ||
1176 | buffer_init(&m); | |
1177 | buffer_put_cstring(&m, command); | |
1178 | ||
1179 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); | |
1180 | buffer_free(&m); | |
1181 | } | |
6039eeef | 1182 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1183 | |
7364bd04 | 1184 | #ifdef GSSAPI |
1185 | OM_uint32 | |
ca75d7de | 1186 | mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) |
7364bd04 | 1187 | { |
1188 | Buffer m; | |
1189 | OM_uint32 major; | |
1190 | ||
1191 | /* Client doesn't get to see the context */ | |
1192 | *ctx = NULL; | |
1193 | ||
1194 | buffer_init(&m); | |
ca75d7de | 1195 | buffer_put_string(&m, goid->elements, goid->length); |
7364bd04 | 1196 | |
1197 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); | |
1198 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); | |
1199 | ||
1200 | major = buffer_get_int(&m); | |
1201 | ||
1202 | buffer_free(&m); | |
1203 | return (major); | |
1204 | } | |
1205 | ||
1206 | OM_uint32 | |
1207 | mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, | |
1208 | gss_buffer_desc *out, OM_uint32 *flags) | |
1209 | { | |
1210 | Buffer m; | |
1211 | OM_uint32 major; | |
f99e1ca4 | 1212 | u_int len; |
7364bd04 | 1213 | |
1214 | buffer_init(&m); | |
1215 | buffer_put_string(&m, in->value, in->length); | |
1216 | ||
1217 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); | |
1218 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); | |
1219 | ||
1220 | major = buffer_get_int(&m); | |
f99e1ca4 | 1221 | out->value = buffer_get_string(&m, &len); |
1222 | out->length = len; | |
7364bd04 | 1223 | if (flags) |
1224 | *flags = buffer_get_int(&m); | |
1225 | ||
1226 | buffer_free(&m); | |
1227 | ||
1228 | return (major); | |
1229 | } | |
1230 | ||
0789992b | 1231 | OM_uint32 |
1232 | mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) | |
1233 | { | |
1234 | Buffer m; | |
1235 | OM_uint32 major; | |
1236 | ||
1237 | buffer_init(&m); | |
1238 | buffer_put_string(&m, gssbuf->value, gssbuf->length); | |
1239 | buffer_put_string(&m, gssmic->value, gssmic->length); | |
1240 | ||
1241 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); | |
1242 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, | |
1243 | &m); | |
1244 | ||
1245 | major = buffer_get_int(&m); | |
1246 | buffer_free(&m); | |
1247 | return(major); | |
1248 | } | |
1249 | ||
7364bd04 | 1250 | int |
1251 | mm_ssh_gssapi_userok(char *user) | |
1252 | { | |
1253 | Buffer m; | |
1254 | int authenticated = 0; | |
1255 | ||
1256 | buffer_init(&m); | |
1257 | ||
1258 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); | |
1259 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, | |
1260 | &m); | |
1261 | ||
1262 | authenticated = buffer_get_int(&m); | |
1263 | ||
1264 | buffer_free(&m); | |
1265 | debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); | |
1266 | return (authenticated); | |
1267 | } | |
1268 | #endif /* GSSAPI */ | |
5adf6b9a | 1269 | |
1270 | #ifdef JPAKE | |
1271 | void | |
1272 | mm_auth2_jpake_get_pwdata(Authctxt *authctxt, BIGNUM **s, | |
1273 | char **hash_scheme, char **salt) | |
1274 | { | |
1275 | Buffer m; | |
1276 | ||
1277 | debug3("%s entering", __func__); | |
1278 | ||
1279 | buffer_init(&m); | |
1280 | mm_request_send(pmonitor->m_recvfd, | |
1281 | MONITOR_REQ_JPAKE_GET_PWDATA, &m); | |
1282 | ||
1283 | debug3("%s: waiting for MONITOR_ANS_JPAKE_GET_PWDATA", __func__); | |
1284 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1285 | MONITOR_ANS_JPAKE_GET_PWDATA, &m); | |
1286 | ||
1287 | *hash_scheme = buffer_get_string(&m, NULL); | |
1288 | *salt = buffer_get_string(&m, NULL); | |
1289 | ||
1290 | buffer_free(&m); | |
1291 | } | |
1292 | ||
1293 | void | |
5b01421b | 1294 | mm_jpake_step1(struct modp_group *grp, |
5adf6b9a | 1295 | u_char **id, u_int *id_len, |
1296 | BIGNUM **priv1, BIGNUM **priv2, BIGNUM **g_priv1, BIGNUM **g_priv2, | |
1297 | u_char **priv1_proof, u_int *priv1_proof_len, | |
1298 | u_char **priv2_proof, u_int *priv2_proof_len) | |
1299 | { | |
1300 | Buffer m; | |
1301 | ||
1302 | debug3("%s entering", __func__); | |
1303 | ||
1304 | buffer_init(&m); | |
1305 | mm_request_send(pmonitor->m_recvfd, | |
1306 | MONITOR_REQ_JPAKE_STEP1, &m); | |
1307 | ||
1308 | debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP1", __func__); | |
1309 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1310 | MONITOR_ANS_JPAKE_STEP1, &m); | |
1311 | ||
1312 | if ((*priv1 = BN_new()) == NULL || | |
1313 | (*priv2 = BN_new()) == NULL || | |
1314 | (*g_priv1 = BN_new()) == NULL || | |
1315 | (*g_priv2 = BN_new()) == NULL) | |
1316 | fatal("%s: BN_new", __func__); | |
1317 | ||
1318 | *id = buffer_get_string(&m, id_len); | |
1319 | /* priv1 and priv2 are, well, private */ | |
1320 | buffer_get_bignum2(&m, *g_priv1); | |
1321 | buffer_get_bignum2(&m, *g_priv2); | |
1322 | *priv1_proof = buffer_get_string(&m, priv1_proof_len); | |
1323 | *priv2_proof = buffer_get_string(&m, priv2_proof_len); | |
1324 | ||
1325 | buffer_free(&m); | |
1326 | } | |
1327 | ||
1328 | void | |
5b01421b | 1329 | mm_jpake_step2(struct modp_group *grp, BIGNUM *s, |
5adf6b9a | 1330 | BIGNUM *mypub1, BIGNUM *theirpub1, BIGNUM *theirpub2, BIGNUM *mypriv2, |
1331 | const u_char *theirid, u_int theirid_len, | |
1332 | const u_char *myid, u_int myid_len, | |
1333 | const u_char *theirpub1_proof, u_int theirpub1_proof_len, | |
1334 | const u_char *theirpub2_proof, u_int theirpub2_proof_len, | |
1335 | BIGNUM **newpub, | |
1336 | u_char **newpub_exponent_proof, u_int *newpub_exponent_proof_len) | |
1337 | { | |
1338 | Buffer m; | |
1339 | ||
1340 | debug3("%s entering", __func__); | |
1341 | ||
1342 | buffer_init(&m); | |
1343 | /* monitor already has all bignums except theirpub1, theirpub2 */ | |
1344 | buffer_put_bignum2(&m, theirpub1); | |
1345 | buffer_put_bignum2(&m, theirpub2); | |
1346 | /* monitor already knows our id */ | |
1347 | buffer_put_string(&m, theirid, theirid_len); | |
1348 | buffer_put_string(&m, theirpub1_proof, theirpub1_proof_len); | |
1349 | buffer_put_string(&m, theirpub2_proof, theirpub2_proof_len); | |
1350 | ||
1351 | mm_request_send(pmonitor->m_recvfd, | |
1352 | MONITOR_REQ_JPAKE_STEP2, &m); | |
1353 | ||
1354 | debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP2", __func__); | |
1355 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1356 | MONITOR_ANS_JPAKE_STEP2, &m); | |
1357 | ||
1358 | if ((*newpub = BN_new()) == NULL) | |
1359 | fatal("%s: BN_new", __func__); | |
1360 | ||
1361 | buffer_get_bignum2(&m, *newpub); | |
1362 | *newpub_exponent_proof = buffer_get_string(&m, | |
1363 | newpub_exponent_proof_len); | |
1364 | ||
1365 | buffer_free(&m); | |
1366 | } | |
1367 | ||
1368 | void | |
5b01421b | 1369 | mm_jpake_key_confirm(struct modp_group *grp, BIGNUM *s, BIGNUM *step2_val, |
5adf6b9a | 1370 | BIGNUM *mypriv2, BIGNUM *mypub1, BIGNUM *mypub2, |
1371 | BIGNUM *theirpub1, BIGNUM *theirpub2, | |
1372 | const u_char *my_id, u_int my_id_len, | |
1373 | const u_char *their_id, u_int their_id_len, | |
1374 | const u_char *sess_id, u_int sess_id_len, | |
1375 | const u_char *theirpriv2_s_proof, u_int theirpriv2_s_proof_len, | |
1376 | BIGNUM **k, | |
1377 | u_char **confirm_hash, u_int *confirm_hash_len) | |
1378 | { | |
1379 | Buffer m; | |
1380 | ||
1381 | debug3("%s entering", __func__); | |
1382 | ||
1383 | buffer_init(&m); | |
1384 | /* monitor already has all bignums except step2_val */ | |
1385 | buffer_put_bignum2(&m, step2_val); | |
1386 | /* monitor already knows all the ids */ | |
1387 | buffer_put_string(&m, theirpriv2_s_proof, theirpriv2_s_proof_len); | |
1388 | ||
1389 | mm_request_send(pmonitor->m_recvfd, | |
1390 | MONITOR_REQ_JPAKE_KEY_CONFIRM, &m); | |
1391 | ||
1392 | debug3("%s: waiting for MONITOR_ANS_JPAKE_KEY_CONFIRM", __func__); | |
1393 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1394 | MONITOR_ANS_JPAKE_KEY_CONFIRM, &m); | |
1395 | ||
1396 | /* 'k' is sensitive and stays in the monitor */ | |
1397 | *confirm_hash = buffer_get_string(&m, confirm_hash_len); | |
1398 | ||
1399 | buffer_free(&m); | |
1400 | } | |
1401 | ||
1402 | int | |
1403 | mm_jpake_check_confirm(const BIGNUM *k, | |
1404 | const u_char *peer_id, u_int peer_id_len, | |
1405 | const u_char *sess_id, u_int sess_id_len, | |
1406 | const u_char *peer_confirm_hash, u_int peer_confirm_hash_len) | |
1407 | { | |
1408 | Buffer m; | |
1409 | int success = 0; | |
1410 | ||
1411 | debug3("%s entering", __func__); | |
1412 | ||
1413 | buffer_init(&m); | |
1414 | /* k is dummy in slave, ignored */ | |
1415 | /* monitor knows all the ids */ | |
1416 | buffer_put_string(&m, peer_confirm_hash, peer_confirm_hash_len); | |
1417 | mm_request_send(pmonitor->m_recvfd, | |
1418 | MONITOR_REQ_JPAKE_CHECK_CONFIRM, &m); | |
1419 | ||
1420 | debug3("%s: waiting for MONITOR_ANS_JPAKE_CHECK_CONFIRM", __func__); | |
1421 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1422 | MONITOR_ANS_JPAKE_CHECK_CONFIRM, &m); | |
1423 | ||
1424 | success = buffer_get_int(&m); | |
1425 | buffer_free(&m); | |
1426 | ||
1427 | debug3("%s: success = %d", __func__, success); | |
1428 | return success; | |
1429 | } | |
1430 | #endif /* JPAKE */ |