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36e94dc5 | 1 | /* $OpenBSD: monitor_wrap.c,v 1.80 2014/04/29 18:01:49 markus Exp $ */ |
16c343f1 PA |
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" | |
29 | ||
30 | #include <sys/types.h> | |
31 | #include <sys/uio.h> | |
32 | ||
33 | #include <errno.h> | |
34 | #include <pwd.h> | |
35 | #include <signal.h> | |
36 | #include <stdarg.h> | |
37 | #include <stdio.h> | |
38 | #include <string.h> | |
39 | #include <unistd.h> | |
40 | ||
36e94dc5 | 41 | #ifdef WITH_OPENSSL |
16c343f1 PA |
42 | #include <openssl/bn.h> |
43 | #include <openssl/dh.h> | |
cb5eb4f1 | 44 | #include <openssl/evp.h> |
36e94dc5 | 45 | #endif |
16c343f1 | 46 | |
3b69e377 | 47 | #include "openbsd-compat/sys-queue.h" |
16c343f1 PA |
48 | #include "xmalloc.h" |
49 | #include "ssh.h" | |
36e94dc5 | 50 | #ifdef WITH_OPENSSL |
16c343f1 | 51 | #include "dh.h" |
36e94dc5 | 52 | #endif |
16c343f1 PA |
53 | #include "buffer.h" |
54 | #include "key.h" | |
55 | #include "cipher.h" | |
56 | #include "kex.h" | |
57 | #include "hostfile.h" | |
58 | #include "auth.h" | |
59 | #include "auth-options.h" | |
60 | #include "packet.h" | |
61 | #include "mac.h" | |
62 | #include "log.h" | |
63 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ | |
64 | #undef TARGET_OS_MAC | |
65 | #include "zlib.h" | |
66 | #define TARGET_OS_MAC 1 | |
67 | #else | |
68 | #include "zlib.h" | |
69 | #endif | |
70 | #include "monitor.h" | |
71 | #ifdef GSSAPI | |
72 | #include "ssh-gss.h" | |
73 | #endif | |
74 | #include "monitor_wrap.h" | |
75 | #include "atomicio.h" | |
76 | #include "monitor_fdpass.h" | |
77 | #include "misc.h" | |
9f304aaf | 78 | #include "uuencode.h" |
16c343f1 PA |
79 | |
80 | #include "channels.h" | |
81 | #include "session.h" | |
82 | #include "servconf.h" | |
40c002af | 83 | #include "roaming.h" |
16c343f1 PA |
84 | |
85 | /* Imports */ | |
86 | extern int compat20; | |
16c343f1 PA |
87 | extern z_stream incoming_stream; |
88 | extern z_stream outgoing_stream; | |
89 | extern struct monitor *pmonitor; | |
16c343f1 PA |
90 | extern Buffer loginmsg; |
91 | extern ServerOptions options; | |
92 | ||
1c188a7f PA |
93 | void |
94 | mm_log_handler(LogLevel level, const char *msg, void *ctx) | |
95 | { | |
96 | Buffer log_msg; | |
97 | struct monitor *mon = (struct monitor *)ctx; | |
98 | ||
99 | if (mon->m_log_sendfd == -1) | |
100 | fatal("%s: no log channel", __func__); | |
101 | ||
102 | buffer_init(&log_msg); | |
103 | /* | |
104 | * Placeholder for packet length. Will be filled in with the actual | |
105 | * packet length once the packet has been constucted. This saves | |
106 | * fragile math. | |
107 | */ | |
108 | buffer_put_int(&log_msg, 0); | |
109 | ||
110 | buffer_put_int(&log_msg, level); | |
111 | buffer_put_cstring(&log_msg, msg); | |
112 | put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); | |
113 | if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), | |
114 | buffer_len(&log_msg)) != buffer_len(&log_msg)) | |
115 | fatal("%s: write: %s", __func__, strerror(errno)); | |
116 | buffer_free(&log_msg); | |
117 | } | |
118 | ||
16c343f1 PA |
119 | int |
120 | mm_is_monitor(void) | |
121 | { | |
122 | /* | |
123 | * m_pid is only set in the privileged part, and | |
124 | * points to the unprivileged child. | |
125 | */ | |
126 | return (pmonitor && pmonitor->m_pid > 0); | |
127 | } | |
128 | ||
129 | void | |
130 | mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) | |
131 | { | |
132 | u_int mlen = buffer_len(m); | |
133 | u_char buf[5]; | |
134 | ||
135 | debug3("%s entering: type %d", __func__, type); | |
136 | ||
137 | put_u32(buf, mlen + 1); | |
138 | buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ | |
139 | if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) | |
140 | fatal("%s: write: %s", __func__, strerror(errno)); | |
141 | if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) | |
142 | fatal("%s: write: %s", __func__, strerror(errno)); | |
143 | } | |
144 | ||
145 | void | |
146 | mm_request_receive(int sock, Buffer *m) | |
147 | { | |
148 | u_char buf[4]; | |
149 | u_int msg_len; | |
150 | ||
151 | debug3("%s entering", __func__); | |
152 | ||
153 | if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { | |
154 | if (errno == EPIPE) | |
155 | cleanup_exit(255); | |
156 | fatal("%s: read: %s", __func__, strerror(errno)); | |
157 | } | |
158 | msg_len = get_u32(buf); | |
159 | if (msg_len > 256 * 1024) | |
160 | fatal("%s: read: bad msg_len %d", __func__, msg_len); | |
161 | buffer_clear(m); | |
162 | buffer_append_space(m, msg_len); | |
163 | if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) | |
164 | fatal("%s: read: %s", __func__, strerror(errno)); | |
165 | } | |
166 | ||
167 | void | |
168 | mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) | |
169 | { | |
170 | u_char rtype; | |
171 | ||
172 | debug3("%s entering: type %d", __func__, type); | |
173 | ||
174 | mm_request_receive(sock, m); | |
175 | rtype = buffer_get_char(m); | |
176 | if (rtype != type) | |
177 | fatal("%s: read: rtype %d != type %d", __func__, | |
178 | rtype, type); | |
179 | } | |
180 | ||
36e94dc5 | 181 | #ifdef WITH_OPENSSL |
16c343f1 PA |
182 | DH * |
183 | mm_choose_dh(int min, int nbits, int max) | |
184 | { | |
185 | BIGNUM *p, *g; | |
186 | int success = 0; | |
187 | Buffer m; | |
188 | ||
189 | buffer_init(&m); | |
190 | buffer_put_int(&m, min); | |
191 | buffer_put_int(&m, nbits); | |
192 | buffer_put_int(&m, max); | |
193 | ||
194 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); | |
195 | ||
196 | debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); | |
197 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); | |
198 | ||
199 | success = buffer_get_char(&m); | |
200 | if (success == 0) | |
201 | fatal("%s: MONITOR_ANS_MODULI failed", __func__); | |
202 | ||
203 | if ((p = BN_new()) == NULL) | |
204 | fatal("%s: BN_new failed", __func__); | |
205 | if ((g = BN_new()) == NULL) | |
206 | fatal("%s: BN_new failed", __func__); | |
207 | buffer_get_bignum2(&m, p); | |
208 | buffer_get_bignum2(&m, g); | |
209 | ||
210 | debug3("%s: remaining %d", __func__, buffer_len(&m)); | |
211 | buffer_free(&m); | |
212 | ||
213 | return (dh_new_group(g, p)); | |
214 | } | |
36e94dc5 | 215 | #endif |
16c343f1 PA |
216 | |
217 | int | |
218 | mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) | |
219 | { | |
220 | Kex *kex = *pmonitor->m_pkex; | |
221 | Buffer m; | |
222 | ||
223 | debug3("%s entering", __func__); | |
224 | ||
225 | buffer_init(&m); | |
226 | buffer_put_int(&m, kex->host_key_index(key)); | |
227 | buffer_put_string(&m, data, datalen); | |
228 | ||
229 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); | |
230 | ||
231 | debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); | |
232 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); | |
233 | *sigp = buffer_get_string(&m, lenp); | |
234 | buffer_free(&m); | |
235 | ||
236 | return (0); | |
237 | } | |
238 | ||
239 | struct passwd * | |
240 | mm_getpwnamallow(const char *username) | |
241 | { | |
242 | Buffer m; | |
243 | struct passwd *pw; | |
1c188a7f | 244 | u_int len, i; |
16c343f1 PA |
245 | ServerOptions *newopts; |
246 | ||
247 | debug3("%s entering", __func__); | |
248 | ||
249 | buffer_init(&m); | |
250 | buffer_put_cstring(&m, username); | |
251 | ||
252 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); | |
253 | ||
254 | debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); | |
255 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); | |
256 | ||
257 | if (buffer_get_char(&m) == 0) { | |
258 | pw = NULL; | |
259 | goto out; | |
260 | } | |
261 | pw = buffer_get_string(&m, &len); | |
262 | if (len != sizeof(struct passwd)) | |
263 | fatal("%s: struct passwd size mismatch", __func__); | |
264 | pw->pw_name = buffer_get_string(&m, NULL); | |
265 | pw->pw_passwd = buffer_get_string(&m, NULL); | |
36e94dc5 | 266 | #ifdef HAVE_STRUCT_PASSWD_PW_GECOS |
16c343f1 | 267 | pw->pw_gecos = buffer_get_string(&m, NULL); |
36e94dc5 PA |
268 | #endif |
269 | #ifdef HAVE_STRUCT_PASSWD_PW_CLASS | |
16c343f1 PA |
270 | pw->pw_class = buffer_get_string(&m, NULL); |
271 | #endif | |
272 | pw->pw_dir = buffer_get_string(&m, NULL); | |
273 | pw->pw_shell = buffer_get_string(&m, NULL); | |
274 | ||
275 | out: | |
276 | /* copy options block as a Match directive may have changed some */ | |
277 | newopts = buffer_get_string(&m, &len); | |
278 | if (len != sizeof(*newopts)) | |
279 | fatal("%s: option block size mismatch", __func__); | |
1c188a7f PA |
280 | |
281 | #define M_CP_STROPT(x) do { \ | |
282 | if (newopts->x != NULL) \ | |
283 | newopts->x = buffer_get_string(&m, NULL); \ | |
284 | } while (0) | |
285 | #define M_CP_STRARRAYOPT(x, nx) do { \ | |
286 | for (i = 0; i < newopts->nx; i++) \ | |
287 | newopts->x[i] = buffer_get_string(&m, NULL); \ | |
288 | } while (0) | |
289 | /* See comment in servconf.h */ | |
290 | COPY_MATCH_STRING_OPTS(); | |
291 | #undef M_CP_STROPT | |
292 | #undef M_CP_STRARRAYOPT | |
293 | ||
16c343f1 | 294 | copy_set_server_options(&options, newopts, 1); |
36e94dc5 | 295 | free(newopts); |
16c343f1 PA |
296 | |
297 | buffer_free(&m); | |
298 | ||
299 | return (pw); | |
300 | } | |
301 | ||
302 | char * | |
303 | mm_auth2_read_banner(void) | |
304 | { | |
305 | Buffer m; | |
306 | char *banner; | |
307 | ||
308 | debug3("%s entering", __func__); | |
309 | ||
310 | buffer_init(&m); | |
311 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); | |
312 | buffer_clear(&m); | |
313 | ||
314 | mm_request_receive_expect(pmonitor->m_recvfd, | |
315 | MONITOR_ANS_AUTH2_READ_BANNER, &m); | |
316 | banner = buffer_get_string(&m, NULL); | |
317 | buffer_free(&m); | |
318 | ||
319 | /* treat empty banner as missing banner */ | |
320 | if (strlen(banner) == 0) { | |
36e94dc5 | 321 | free(banner); |
16c343f1 PA |
322 | banner = NULL; |
323 | } | |
324 | return (banner); | |
325 | } | |
326 | ||
327 | /* Inform the privileged process about service and style */ | |
328 | ||
329 | void | |
330 | mm_inform_authserv(char *service, char *style) | |
331 | { | |
332 | Buffer m; | |
333 | ||
334 | debug3("%s entering", __func__); | |
335 | ||
336 | buffer_init(&m); | |
337 | buffer_put_cstring(&m, service); | |
338 | buffer_put_cstring(&m, style ? style : ""); | |
339 | ||
340 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); | |
341 | ||
342 | buffer_free(&m); | |
343 | } | |
344 | ||
345 | /* Do the password authentication */ | |
346 | int | |
347 | mm_auth_password(Authctxt *authctxt, char *password) | |
348 | { | |
349 | Buffer m; | |
350 | int authenticated = 0; | |
351 | ||
352 | debug3("%s entering", __func__); | |
353 | ||
354 | buffer_init(&m); | |
355 | buffer_put_cstring(&m, password); | |
356 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); | |
357 | ||
358 | debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); | |
359 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); | |
360 | ||
361 | authenticated = buffer_get_int(&m); | |
362 | ||
363 | buffer_free(&m); | |
364 | ||
365 | debug3("%s: user %sauthenticated", | |
366 | __func__, authenticated ? "" : "not "); | |
367 | return (authenticated); | |
368 | } | |
369 | ||
370 | int | |
371 | mm_user_key_allowed(struct passwd *pw, Key *key) | |
372 | { | |
373 | return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); | |
374 | } | |
375 | ||
376 | int | |
377 | mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, | |
378 | Key *key) | |
379 | { | |
380 | return (mm_key_allowed(MM_HOSTKEY, user, host, key)); | |
381 | } | |
382 | ||
383 | int | |
384 | mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, | |
385 | char *host, Key *key) | |
386 | { | |
387 | int ret; | |
388 | ||
389 | key->type = KEY_RSA; /* XXX hack for key_to_blob */ | |
390 | ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); | |
391 | key->type = KEY_RSA1; | |
392 | return (ret); | |
393 | } | |
394 | ||
16c343f1 PA |
395 | int |
396 | mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) | |
397 | { | |
398 | Buffer m; | |
399 | u_char *blob; | |
400 | u_int len; | |
401 | int allowed = 0, have_forced = 0; | |
402 | ||
403 | debug3("%s entering", __func__); | |
404 | ||
405 | /* Convert the key to a blob and the pass it over */ | |
406 | if (!key_to_blob(key, &blob, &len)) | |
407 | return (0); | |
408 | ||
409 | buffer_init(&m); | |
410 | buffer_put_int(&m, type); | |
411 | buffer_put_cstring(&m, user ? user : ""); | |
412 | buffer_put_cstring(&m, host ? host : ""); | |
413 | buffer_put_string(&m, blob, len); | |
36e94dc5 | 414 | free(blob); |
16c343f1 PA |
415 | |
416 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); | |
417 | ||
418 | debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); | |
419 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); | |
420 | ||
421 | allowed = buffer_get_int(&m); | |
422 | ||
423 | /* fake forced command */ | |
424 | auth_clear_options(); | |
425 | have_forced = buffer_get_int(&m); | |
426 | forced_command = have_forced ? xstrdup("true") : NULL; | |
427 | ||
16c343f1 PA |
428 | buffer_free(&m); |
429 | ||
430 | return (allowed); | |
431 | } | |
432 | ||
433 | /* | |
434 | * This key verify needs to send the key type along, because the | |
435 | * privileged parent makes the decision if the key is allowed | |
436 | * for authentication. | |
437 | */ | |
438 | ||
439 | int | |
440 | mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) | |
441 | { | |
442 | Buffer m; | |
443 | u_char *blob; | |
444 | u_int len; | |
445 | int verified = 0; | |
446 | ||
447 | debug3("%s entering", __func__); | |
448 | ||
449 | /* Convert the key to a blob and the pass it over */ | |
450 | if (!key_to_blob(key, &blob, &len)) | |
451 | return (0); | |
452 | ||
453 | buffer_init(&m); | |
454 | buffer_put_string(&m, blob, len); | |
455 | buffer_put_string(&m, sig, siglen); | |
456 | buffer_put_string(&m, data, datalen); | |
36e94dc5 | 457 | free(blob); |
16c343f1 PA |
458 | |
459 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); | |
460 | ||
461 | debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); | |
462 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); | |
463 | ||
464 | verified = buffer_get_int(&m); | |
465 | ||
466 | buffer_free(&m); | |
467 | ||
468 | return (verified); | |
469 | } | |
470 | ||
471 | /* Export key state after authentication */ | |
472 | Newkeys * | |
473 | mm_newkeys_from_blob(u_char *blob, int blen) | |
474 | { | |
475 | Buffer b; | |
476 | u_int len; | |
477 | Newkeys *newkey = NULL; | |
478 | Enc *enc; | |
479 | Mac *mac; | |
480 | Comp *comp; | |
481 | ||
482 | debug3("%s: %p(%d)", __func__, blob, blen); | |
483 | #ifdef DEBUG_PK | |
484 | dump_base64(stderr, blob, blen); | |
485 | #endif | |
486 | buffer_init(&b); | |
487 | buffer_append(&b, blob, blen); | |
488 | ||
36e94dc5 | 489 | newkey = xcalloc(1, sizeof(*newkey)); |
16c343f1 PA |
490 | enc = &newkey->enc; |
491 | mac = &newkey->mac; | |
492 | comp = &newkey->comp; | |
493 | ||
494 | /* Enc structure */ | |
495 | enc->name = buffer_get_string(&b, NULL); | |
496 | buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); | |
497 | enc->enabled = buffer_get_int(&b); | |
498 | enc->block_size = buffer_get_int(&b); | |
499 | enc->key = buffer_get_string(&b, &enc->key_len); | |
36e94dc5 | 500 | enc->iv = buffer_get_string(&b, &enc->iv_len); |
16c343f1 PA |
501 | |
502 | if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) | |
503 | fatal("%s: bad cipher name %s or pointer %p", __func__, | |
504 | enc->name, enc->cipher); | |
505 | ||
506 | /* Mac structure */ | |
36e94dc5 PA |
507 | if (cipher_authlen(enc->cipher) == 0) { |
508 | mac->name = buffer_get_string(&b, NULL); | |
509 | if (mac->name == NULL || mac_setup(mac, mac->name) == -1) | |
510 | fatal("%s: can not setup mac %s", __func__, mac->name); | |
511 | mac->enabled = buffer_get_int(&b); | |
512 | mac->key = buffer_get_string(&b, &len); | |
513 | if (len > mac->key_len) | |
514 | fatal("%s: bad mac key length: %u > %d", __func__, len, | |
515 | mac->key_len); | |
516 | mac->key_len = len; | |
517 | } | |
16c343f1 PA |
518 | |
519 | /* Comp structure */ | |
520 | comp->type = buffer_get_int(&b); | |
521 | comp->enabled = buffer_get_int(&b); | |
522 | comp->name = buffer_get_string(&b, NULL); | |
523 | ||
524 | len = buffer_len(&b); | |
525 | if (len != 0) | |
526 | error("newkeys_from_blob: remaining bytes in blob %u", len); | |
527 | buffer_free(&b); | |
528 | return (newkey); | |
529 | } | |
530 | ||
531 | int | |
532 | mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) | |
533 | { | |
534 | Buffer b; | |
535 | int len; | |
536 | Enc *enc; | |
537 | Mac *mac; | |
538 | Comp *comp; | |
40c002af | 539 | Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode); |
16c343f1 PA |
540 | |
541 | debug3("%s: converting %p", __func__, newkey); | |
542 | ||
543 | if (newkey == NULL) { | |
544 | error("%s: newkey == NULL", __func__); | |
545 | return 0; | |
546 | } | |
547 | enc = &newkey->enc; | |
548 | mac = &newkey->mac; | |
549 | comp = &newkey->comp; | |
550 | ||
551 | buffer_init(&b); | |
552 | /* Enc structure */ | |
553 | buffer_put_cstring(&b, enc->name); | |
554 | /* The cipher struct is constant and shared, you export pointer */ | |
555 | buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); | |
556 | buffer_put_int(&b, enc->enabled); | |
557 | buffer_put_int(&b, enc->block_size); | |
558 | buffer_put_string(&b, enc->key, enc->key_len); | |
36e94dc5 PA |
559 | packet_get_keyiv(mode, enc->iv, enc->iv_len); |
560 | buffer_put_string(&b, enc->iv, enc->iv_len); | |
16c343f1 PA |
561 | |
562 | /* Mac structure */ | |
36e94dc5 PA |
563 | if (cipher_authlen(enc->cipher) == 0) { |
564 | buffer_put_cstring(&b, mac->name); | |
565 | buffer_put_int(&b, mac->enabled); | |
566 | buffer_put_string(&b, mac->key, mac->key_len); | |
567 | } | |
16c343f1 PA |
568 | |
569 | /* Comp structure */ | |
570 | buffer_put_int(&b, comp->type); | |
571 | buffer_put_int(&b, comp->enabled); | |
572 | buffer_put_cstring(&b, comp->name); | |
573 | ||
574 | len = buffer_len(&b); | |
575 | if (lenp != NULL) | |
576 | *lenp = len; | |
577 | if (blobp != NULL) { | |
578 | *blobp = xmalloc(len); | |
579 | memcpy(*blobp, buffer_ptr(&b), len); | |
580 | } | |
36e94dc5 | 581 | explicit_bzero(buffer_ptr(&b), len); |
16c343f1 PA |
582 | buffer_free(&b); |
583 | return len; | |
584 | } | |
585 | ||
586 | static void | |
587 | mm_send_kex(Buffer *m, Kex *kex) | |
588 | { | |
589 | buffer_put_string(m, kex->session_id, kex->session_id_len); | |
590 | buffer_put_int(m, kex->we_need); | |
591 | buffer_put_int(m, kex->hostkey_type); | |
592 | buffer_put_int(m, kex->kex_type); | |
593 | buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); | |
594 | buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); | |
595 | buffer_put_int(m, kex->flags); | |
596 | buffer_put_cstring(m, kex->client_version_string); | |
597 | buffer_put_cstring(m, kex->server_version_string); | |
598 | } | |
599 | ||
600 | void | |
601 | mm_send_keystate(struct monitor *monitor) | |
602 | { | |
40c002af | 603 | Buffer m, *input, *output; |
16c343f1 PA |
604 | u_char *blob, *p; |
605 | u_int bloblen, plen; | |
606 | u_int32_t seqnr, packets; | |
3b69e377 | 607 | u_int64_t blocks, bytes; |
16c343f1 PA |
608 | |
609 | buffer_init(&m); | |
610 | ||
611 | if (!compat20) { | |
612 | u_char iv[24]; | |
613 | u_char *key; | |
614 | u_int ivlen, keylen; | |
615 | ||
616 | buffer_put_int(&m, packet_get_protocol_flags()); | |
617 | ||
618 | buffer_put_int(&m, packet_get_ssh1_cipher()); | |
619 | ||
620 | debug3("%s: Sending ssh1 KEY+IV", __func__); | |
621 | keylen = packet_get_encryption_key(NULL); | |
622 | key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ | |
623 | keylen = packet_get_encryption_key(key); | |
624 | buffer_put_string(&m, key, keylen); | |
36e94dc5 PA |
625 | explicit_bzero(key, keylen); |
626 | free(key); | |
16c343f1 PA |
627 | |
628 | ivlen = packet_get_keyiv_len(MODE_OUT); | |
629 | packet_get_keyiv(MODE_OUT, iv, ivlen); | |
630 | buffer_put_string(&m, iv, ivlen); | |
36e94dc5 | 631 | ivlen = packet_get_keyiv_len(MODE_IN); |
16c343f1 PA |
632 | packet_get_keyiv(MODE_IN, iv, ivlen); |
633 | buffer_put_string(&m, iv, ivlen); | |
634 | goto skip; | |
635 | } else { | |
636 | /* Kex for rekeying */ | |
637 | mm_send_kex(&m, *monitor->m_pkex); | |
638 | } | |
639 | ||
640 | debug3("%s: Sending new keys: %p %p", | |
40c002af PA |
641 | __func__, packet_get_newkeys(MODE_OUT), |
642 | packet_get_newkeys(MODE_IN)); | |
16c343f1 PA |
643 | |
644 | /* Keys from Kex */ | |
645 | if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) | |
646 | fatal("%s: conversion of newkeys failed", __func__); | |
647 | ||
648 | buffer_put_string(&m, blob, bloblen); | |
36e94dc5 | 649 | free(blob); |
16c343f1 PA |
650 | |
651 | if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) | |
652 | fatal("%s: conversion of newkeys failed", __func__); | |
653 | ||
654 | buffer_put_string(&m, blob, bloblen); | |
36e94dc5 | 655 | free(blob); |
16c343f1 | 656 | |
3b69e377 | 657 | packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); |
16c343f1 PA |
658 | buffer_put_int(&m, seqnr); |
659 | buffer_put_int64(&m, blocks); | |
660 | buffer_put_int(&m, packets); | |
3b69e377 PA |
661 | buffer_put_int64(&m, bytes); |
662 | packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); | |
16c343f1 PA |
663 | buffer_put_int(&m, seqnr); |
664 | buffer_put_int64(&m, blocks); | |
665 | buffer_put_int(&m, packets); | |
3b69e377 | 666 | buffer_put_int64(&m, bytes); |
16c343f1 PA |
667 | |
668 | debug3("%s: New keys have been sent", __func__); | |
669 | skip: | |
670 | /* More key context */ | |
671 | plen = packet_get_keycontext(MODE_OUT, NULL); | |
672 | p = xmalloc(plen+1); | |
673 | packet_get_keycontext(MODE_OUT, p); | |
674 | buffer_put_string(&m, p, plen); | |
36e94dc5 | 675 | free(p); |
16c343f1 PA |
676 | |
677 | plen = packet_get_keycontext(MODE_IN, NULL); | |
678 | p = xmalloc(plen+1); | |
679 | packet_get_keycontext(MODE_IN, p); | |
680 | buffer_put_string(&m, p, plen); | |
36e94dc5 | 681 | free(p); |
16c343f1 PA |
682 | |
683 | /* Compression state */ | |
684 | debug3("%s: Sending compression state", __func__); | |
685 | buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); | |
686 | buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); | |
687 | ||
688 | /* Network I/O buffers */ | |
40c002af PA |
689 | input = (Buffer *)packet_get_input(); |
690 | output = (Buffer *)packet_get_output(); | |
691 | buffer_put_string(&m, buffer_ptr(input), buffer_len(input)); | |
692 | buffer_put_string(&m, buffer_ptr(output), buffer_len(output)); | |
693 | ||
694 | /* Roaming */ | |
695 | if (compat20) { | |
696 | buffer_put_int64(&m, get_sent_bytes()); | |
697 | buffer_put_int64(&m, get_recv_bytes()); | |
698 | } | |
16c343f1 PA |
699 | |
700 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); | |
701 | debug3("%s: Finished sending state", __func__); | |
702 | ||
703 | buffer_free(&m); | |
704 | } | |
705 | ||
706 | int | |
707 | mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) | |
708 | { | |
709 | Buffer m; | |
710 | char *p, *msg; | |
3b69e377 PA |
711 | int success = 0, tmp1 = -1, tmp2 = -1; |
712 | ||
713 | /* Kludge: ensure there are fds free to receive the pty/tty */ | |
714 | if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || | |
715 | (tmp2 = dup(pmonitor->m_recvfd)) == -1) { | |
716 | error("%s: cannot allocate fds for pty", __func__); | |
717 | if (tmp1 > 0) | |
718 | close(tmp1); | |
719 | if (tmp2 > 0) | |
720 | close(tmp2); | |
721 | return 0; | |
722 | } | |
723 | close(tmp1); | |
724 | close(tmp2); | |
16c343f1 PA |
725 | |
726 | buffer_init(&m); | |
727 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); | |
728 | ||
729 | debug3("%s: waiting for MONITOR_ANS_PTY", __func__); | |
730 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); | |
731 | ||
732 | success = buffer_get_int(&m); | |
733 | if (success == 0) { | |
734 | debug3("%s: pty alloc failed", __func__); | |
735 | buffer_free(&m); | |
736 | return (0); | |
737 | } | |
738 | p = buffer_get_string(&m, NULL); | |
739 | msg = buffer_get_string(&m, NULL); | |
740 | buffer_free(&m); | |
741 | ||
742 | strlcpy(namebuf, p, namebuflen); /* Possible truncation */ | |
36e94dc5 | 743 | free(p); |
16c343f1 PA |
744 | |
745 | buffer_append(&loginmsg, msg, strlen(msg)); | |
36e94dc5 | 746 | free(msg); |
16c343f1 PA |
747 | |
748 | if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || | |
749 | (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) | |
750 | fatal("%s: receive fds failed", __func__); | |
751 | ||
752 | /* Success */ | |
753 | return (1); | |
754 | } | |
755 | ||
756 | void | |
757 | mm_session_pty_cleanup2(Session *s) | |
758 | { | |
759 | Buffer m; | |
760 | ||
761 | if (s->ttyfd == -1) | |
762 | return; | |
763 | buffer_init(&m); | |
764 | buffer_put_cstring(&m, s->tty); | |
765 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); | |
766 | buffer_free(&m); | |
767 | ||
768 | /* closed dup'ed master */ | |
3b69e377 PA |
769 | if (s->ptymaster != -1 && close(s->ptymaster) < 0) |
770 | error("close(s->ptymaster/%d): %s", | |
771 | s->ptymaster, strerror(errno)); | |
16c343f1 PA |
772 | |
773 | /* unlink pty from session */ | |
774 | s->ttyfd = -1; | |
775 | } | |
776 | ||
777 | #ifdef USE_PAM | |
778 | void | |
779 | mm_start_pam(Authctxt *authctxt) | |
780 | { | |
781 | Buffer m; | |
782 | ||
783 | debug3("%s entering", __func__); | |
784 | if (!options.use_pam) | |
785 | fatal("UsePAM=no, but ended up in %s anyway", __func__); | |
786 | ||
787 | buffer_init(&m); | |
788 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); | |
789 | ||
790 | buffer_free(&m); | |
791 | } | |
792 | ||
793 | u_int | |
794 | mm_do_pam_account(void) | |
795 | { | |
796 | Buffer m; | |
797 | u_int ret; | |
798 | char *msg; | |
799 | ||
800 | debug3("%s entering", __func__); | |
801 | if (!options.use_pam) | |
802 | fatal("UsePAM=no, but ended up in %s anyway", __func__); | |
803 | ||
804 | buffer_init(&m); | |
805 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); | |
806 | ||
807 | mm_request_receive_expect(pmonitor->m_recvfd, | |
808 | MONITOR_ANS_PAM_ACCOUNT, &m); | |
809 | ret = buffer_get_int(&m); | |
810 | msg = buffer_get_string(&m, NULL); | |
811 | buffer_append(&loginmsg, msg, strlen(msg)); | |
36e94dc5 | 812 | free(msg); |
16c343f1 PA |
813 | |
814 | buffer_free(&m); | |
815 | ||
816 | debug3("%s returning %d", __func__, ret); | |
817 | ||
818 | return (ret); | |
819 | } | |
820 | ||
821 | void * | |
822 | mm_sshpam_init_ctx(Authctxt *authctxt) | |
823 | { | |
824 | Buffer m; | |
825 | int success; | |
826 | ||
827 | debug3("%s", __func__); | |
828 | buffer_init(&m); | |
829 | buffer_put_cstring(&m, authctxt->user); | |
830 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); | |
831 | debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); | |
832 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); | |
833 | success = buffer_get_int(&m); | |
834 | if (success == 0) { | |
835 | debug3("%s: pam_init_ctx failed", __func__); | |
836 | buffer_free(&m); | |
837 | return (NULL); | |
838 | } | |
839 | buffer_free(&m); | |
840 | return (authctxt); | |
841 | } | |
842 | ||
843 | int | |
844 | mm_sshpam_query(void *ctx, char **name, char **info, | |
845 | u_int *num, char ***prompts, u_int **echo_on) | |
846 | { | |
847 | Buffer m; | |
848 | u_int i; | |
849 | int ret; | |
850 | ||
851 | debug3("%s", __func__); | |
852 | buffer_init(&m); | |
853 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); | |
854 | debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); | |
855 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); | |
856 | ret = buffer_get_int(&m); | |
857 | debug3("%s: pam_query returned %d", __func__, ret); | |
858 | *name = buffer_get_string(&m, NULL); | |
859 | *info = buffer_get_string(&m, NULL); | |
860 | *num = buffer_get_int(&m); | |
861 | if (*num > PAM_MAX_NUM_MSG) | |
862 | fatal("%s: recieved %u PAM messages, expected <= %u", | |
863 | __func__, *num, PAM_MAX_NUM_MSG); | |
864 | *prompts = xcalloc((*num + 1), sizeof(char *)); | |
865 | *echo_on = xcalloc((*num + 1), sizeof(u_int)); | |
866 | for (i = 0; i < *num; ++i) { | |
867 | (*prompts)[i] = buffer_get_string(&m, NULL); | |
868 | (*echo_on)[i] = buffer_get_int(&m); | |
869 | } | |
870 | buffer_free(&m); | |
871 | return (ret); | |
872 | } | |
873 | ||
874 | int | |
875 | mm_sshpam_respond(void *ctx, u_int num, char **resp) | |
876 | { | |
877 | Buffer m; | |
878 | u_int i; | |
879 | int ret; | |
880 | ||
881 | debug3("%s", __func__); | |
882 | buffer_init(&m); | |
883 | buffer_put_int(&m, num); | |
884 | for (i = 0; i < num; ++i) | |
885 | buffer_put_cstring(&m, resp[i]); | |
886 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); | |
887 | debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); | |
888 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); | |
889 | ret = buffer_get_int(&m); | |
890 | debug3("%s: pam_respond returned %d", __func__, ret); | |
891 | buffer_free(&m); | |
892 | return (ret); | |
893 | } | |
894 | ||
895 | void | |
896 | mm_sshpam_free_ctx(void *ctxtp) | |
897 | { | |
898 | Buffer m; | |
899 | ||
900 | debug3("%s", __func__); | |
901 | buffer_init(&m); | |
902 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); | |
903 | debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); | |
904 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); | |
905 | buffer_free(&m); | |
906 | } | |
907 | #endif /* USE_PAM */ | |
908 | ||
909 | /* Request process termination */ | |
910 | ||
911 | void | |
912 | mm_terminate(void) | |
913 | { | |
914 | Buffer m; | |
915 | ||
916 | buffer_init(&m); | |
917 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); | |
918 | buffer_free(&m); | |
919 | } | |
920 | ||
36e94dc5 | 921 | #ifdef WITH_SSH1 |
16c343f1 PA |
922 | int |
923 | mm_ssh1_session_key(BIGNUM *num) | |
924 | { | |
925 | int rsafail; | |
926 | Buffer m; | |
927 | ||
928 | buffer_init(&m); | |
929 | buffer_put_bignum2(&m, num); | |
930 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); | |
931 | ||
932 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); | |
933 | ||
934 | rsafail = buffer_get_int(&m); | |
935 | buffer_get_bignum2(&m, num); | |
936 | ||
937 | buffer_free(&m); | |
938 | ||
939 | return (rsafail); | |
940 | } | |
36e94dc5 | 941 | #endif |
16c343f1 PA |
942 | |
943 | static void | |
944 | mm_chall_setup(char **name, char **infotxt, u_int *numprompts, | |
945 | char ***prompts, u_int **echo_on) | |
946 | { | |
947 | *name = xstrdup(""); | |
948 | *infotxt = xstrdup(""); | |
949 | *numprompts = 1; | |
950 | *prompts = xcalloc(*numprompts, sizeof(char *)); | |
951 | *echo_on = xcalloc(*numprompts, sizeof(u_int)); | |
952 | (*echo_on)[0] = 0; | |
953 | } | |
954 | ||
955 | int | |
956 | mm_bsdauth_query(void *ctx, char **name, char **infotxt, | |
957 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
958 | { | |
959 | Buffer m; | |
960 | u_int success; | |
961 | char *challenge; | |
962 | ||
963 | debug3("%s: entering", __func__); | |
964 | ||
965 | buffer_init(&m); | |
966 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); | |
967 | ||
968 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, | |
969 | &m); | |
970 | success = buffer_get_int(&m); | |
971 | if (success == 0) { | |
972 | debug3("%s: no challenge", __func__); | |
973 | buffer_free(&m); | |
974 | return (-1); | |
975 | } | |
976 | ||
977 | /* Get the challenge, and format the response */ | |
978 | challenge = buffer_get_string(&m, NULL); | |
979 | buffer_free(&m); | |
980 | ||
981 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
982 | (*prompts)[0] = challenge; | |
983 | ||
984 | debug3("%s: received challenge: %s", __func__, challenge); | |
985 | ||
986 | return (0); | |
987 | } | |
988 | ||
989 | int | |
990 | mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) | |
991 | { | |
992 | Buffer m; | |
993 | int authok; | |
994 | ||
995 | debug3("%s: entering", __func__); | |
996 | if (numresponses != 1) | |
997 | return (-1); | |
998 | ||
999 | buffer_init(&m); | |
1000 | buffer_put_cstring(&m, responses[0]); | |
1001 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); | |
1002 | ||
1003 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1004 | MONITOR_ANS_BSDAUTHRESPOND, &m); | |
1005 | ||
1006 | authok = buffer_get_int(&m); | |
1007 | buffer_free(&m); | |
1008 | ||
1009 | return ((authok == 0) ? -1 : 0); | |
1010 | } | |
1011 | ||
1012 | #ifdef SKEY | |
1013 | int | |
1014 | mm_skey_query(void *ctx, char **name, char **infotxt, | |
1015 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
1016 | { | |
1017 | Buffer m; | |
1018 | u_int success; | |
1019 | char *challenge; | |
1020 | ||
1021 | debug3("%s: entering", __func__); | |
1022 | ||
1023 | buffer_init(&m); | |
1024 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); | |
1025 | ||
1026 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, | |
1027 | &m); | |
1028 | success = buffer_get_int(&m); | |
1029 | if (success == 0) { | |
1030 | debug3("%s: no challenge", __func__); | |
1031 | buffer_free(&m); | |
1032 | return (-1); | |
1033 | } | |
1034 | ||
1035 | /* Get the challenge, and format the response */ | |
1036 | challenge = buffer_get_string(&m, NULL); | |
1037 | buffer_free(&m); | |
1038 | ||
1039 | debug3("%s: received challenge: %s", __func__, challenge); | |
1040 | ||
1041 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
1042 | ||
1043 | xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); | |
36e94dc5 | 1044 | free(challenge); |
16c343f1 PA |
1045 | |
1046 | return (0); | |
1047 | } | |
1048 | ||
1049 | int | |
1050 | mm_skey_respond(void *ctx, u_int numresponses, char **responses) | |
1051 | { | |
1052 | Buffer m; | |
1053 | int authok; | |
1054 | ||
1055 | debug3("%s: entering", __func__); | |
1056 | if (numresponses != 1) | |
1057 | return (-1); | |
1058 | ||
1059 | buffer_init(&m); | |
1060 | buffer_put_cstring(&m, responses[0]); | |
1061 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); | |
1062 | ||
1063 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1064 | MONITOR_ANS_SKEYRESPOND, &m); | |
1065 | ||
1066 | authok = buffer_get_int(&m); | |
1067 | buffer_free(&m); | |
1068 | ||
1069 | return ((authok == 0) ? -1 : 0); | |
1070 | } | |
1071 | #endif /* SKEY */ | |
1072 | ||
1073 | void | |
1074 | mm_ssh1_session_id(u_char session_id[16]) | |
1075 | { | |
1076 | Buffer m; | |
1077 | int i; | |
1078 | ||
1079 | debug3("%s entering", __func__); | |
1080 | ||
1081 | buffer_init(&m); | |
1082 | for (i = 0; i < 16; i++) | |
1083 | buffer_put_char(&m, session_id[i]); | |
1084 | ||
1085 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); | |
1086 | buffer_free(&m); | |
1087 | } | |
1088 | ||
36e94dc5 | 1089 | #ifdef WITH_SSH1 |
16c343f1 PA |
1090 | int |
1091 | mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) | |
1092 | { | |
1093 | Buffer m; | |
1094 | Key *key; | |
1095 | u_char *blob; | |
1096 | u_int blen; | |
1097 | int allowed = 0, have_forced = 0; | |
1098 | ||
1099 | debug3("%s entering", __func__); | |
1100 | ||
1101 | buffer_init(&m); | |
1102 | buffer_put_bignum2(&m, client_n); | |
1103 | ||
1104 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); | |
1105 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); | |
1106 | ||
1107 | allowed = buffer_get_int(&m); | |
1108 | ||
1109 | /* fake forced command */ | |
1110 | auth_clear_options(); | |
1111 | have_forced = buffer_get_int(&m); | |
1112 | forced_command = have_forced ? xstrdup("true") : NULL; | |
1113 | ||
1114 | if (allowed && rkey != NULL) { | |
1115 | blob = buffer_get_string(&m, &blen); | |
1116 | if ((key = key_from_blob(blob, blen)) == NULL) | |
1117 | fatal("%s: key_from_blob failed", __func__); | |
1118 | *rkey = key; | |
36e94dc5 | 1119 | free(blob); |
16c343f1 | 1120 | } |
16c343f1 PA |
1121 | buffer_free(&m); |
1122 | ||
1123 | return (allowed); | |
1124 | } | |
1125 | ||
1126 | BIGNUM * | |
1127 | mm_auth_rsa_generate_challenge(Key *key) | |
1128 | { | |
1129 | Buffer m; | |
1130 | BIGNUM *challenge; | |
1131 | u_char *blob; | |
1132 | u_int blen; | |
1133 | ||
1134 | debug3("%s entering", __func__); | |
1135 | ||
1136 | if ((challenge = BN_new()) == NULL) | |
1137 | fatal("%s: BN_new failed", __func__); | |
1138 | ||
1139 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
1140 | if (key_to_blob(key, &blob, &blen) == 0) | |
1141 | fatal("%s: key_to_blob failed", __func__); | |
1142 | key->type = KEY_RSA1; | |
1143 | ||
1144 | buffer_init(&m); | |
1145 | buffer_put_string(&m, blob, blen); | |
36e94dc5 | 1146 | free(blob); |
16c343f1 PA |
1147 | |
1148 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); | |
1149 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); | |
1150 | ||
1151 | buffer_get_bignum2(&m, challenge); | |
1152 | buffer_free(&m); | |
1153 | ||
1154 | return (challenge); | |
1155 | } | |
1156 | ||
1157 | int | |
1158 | mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) | |
1159 | { | |
1160 | Buffer m; | |
1161 | u_char *blob; | |
1162 | u_int blen; | |
1163 | int success = 0; | |
1164 | ||
1165 | debug3("%s entering", __func__); | |
1166 | ||
1167 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
1168 | if (key_to_blob(key, &blob, &blen) == 0) | |
1169 | fatal("%s: key_to_blob failed", __func__); | |
1170 | key->type = KEY_RSA1; | |
1171 | ||
1172 | buffer_init(&m); | |
1173 | buffer_put_string(&m, blob, blen); | |
1174 | buffer_put_string(&m, response, 16); | |
36e94dc5 | 1175 | free(blob); |
16c343f1 PA |
1176 | |
1177 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); | |
1178 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); | |
1179 | ||
1180 | success = buffer_get_int(&m); | |
1181 | buffer_free(&m); | |
1182 | ||
1183 | return (success); | |
1184 | } | |
36e94dc5 | 1185 | #endif |
16c343f1 PA |
1186 | |
1187 | #ifdef SSH_AUDIT_EVENTS | |
1188 | void | |
1189 | mm_audit_event(ssh_audit_event_t event) | |
1190 | { | |
1191 | Buffer m; | |
1192 | ||
1193 | debug3("%s entering", __func__); | |
1194 | ||
1195 | buffer_init(&m); | |
1196 | buffer_put_int(&m, event); | |
1197 | ||
1198 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); | |
1199 | buffer_free(&m); | |
1200 | } | |
1201 | ||
1202 | void | |
1203 | mm_audit_run_command(const char *command) | |
1204 | { | |
1205 | Buffer m; | |
1206 | ||
1207 | debug3("%s entering command %s", __func__, command); | |
1208 | ||
1209 | buffer_init(&m); | |
1210 | buffer_put_cstring(&m, command); | |
1211 | ||
1212 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); | |
1213 | buffer_free(&m); | |
1214 | } | |
1215 | #endif /* SSH_AUDIT_EVENTS */ | |
1216 | ||
1217 | #ifdef GSSAPI | |
1218 | OM_uint32 | |
1219 | mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) | |
1220 | { | |
1221 | Buffer m; | |
1222 | OM_uint32 major; | |
1223 | ||
1224 | /* Client doesn't get to see the context */ | |
1225 | *ctx = NULL; | |
1226 | ||
1227 | buffer_init(&m); | |
1228 | buffer_put_string(&m, goid->elements, goid->length); | |
1229 | ||
1230 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); | |
1231 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); | |
1232 | ||
1233 | major = buffer_get_int(&m); | |
1234 | ||
1235 | buffer_free(&m); | |
1236 | return (major); | |
1237 | } | |
1238 | ||
1239 | OM_uint32 | |
1240 | mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, | |
1241 | gss_buffer_desc *out, OM_uint32 *flags) | |
1242 | { | |
1243 | Buffer m; | |
1244 | OM_uint32 major; | |
1245 | u_int len; | |
1246 | ||
1247 | buffer_init(&m); | |
1248 | buffer_put_string(&m, in->value, in->length); | |
1249 | ||
1250 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); | |
1251 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); | |
1252 | ||
1253 | major = buffer_get_int(&m); | |
1254 | out->value = buffer_get_string(&m, &len); | |
1255 | out->length = len; | |
1256 | if (flags) | |
1257 | *flags = buffer_get_int(&m); | |
1258 | ||
1259 | buffer_free(&m); | |
1260 | ||
1261 | return (major); | |
1262 | } | |
1263 | ||
1264 | OM_uint32 | |
1265 | mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) | |
1266 | { | |
1267 | Buffer m; | |
1268 | OM_uint32 major; | |
1269 | ||
1270 | buffer_init(&m); | |
1271 | buffer_put_string(&m, gssbuf->value, gssbuf->length); | |
1272 | buffer_put_string(&m, gssmic->value, gssmic->length); | |
1273 | ||
1274 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); | |
1275 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, | |
1276 | &m); | |
1277 | ||
1278 | major = buffer_get_int(&m); | |
1279 | buffer_free(&m); | |
1280 | return(major); | |
1281 | } | |
1282 | ||
1283 | int | |
1284 | mm_ssh_gssapi_userok(char *user) | |
1285 | { | |
1286 | Buffer m; | |
1287 | int authenticated = 0; | |
1288 | ||
1289 | buffer_init(&m); | |
1290 | ||
1291 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); | |
1292 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, | |
1293 | &m); | |
1294 | ||
1295 | authenticated = buffer_get_int(&m); | |
1296 | ||
1297 | buffer_free(&m); | |
1298 | debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); | |
1299 | return (authenticated); | |
1300 | } | |
1301 | #endif /* GSSAPI */ | |
cb5eb4f1 | 1302 |