1 /* $OpenBSD: monitor_wrap.c,v 1.79 2014/02/02 03:44:31 djm Exp $ */
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
41 #include <openssl/bn.h>
42 #include <openssl/dh.h>
43 #include <openssl/evp.h>
44
45 #include "openbsd-compat/sys-queue.h"
46 #include "xmalloc.h"
47 #include "ssh.h"
48 #include "dh.h"
49 #include "buffer.h"
50 #include "key.h"
51 #include "cipher.h"
52 #include "kex.h"
53 #include "hostfile.h"
54 #include "auth.h"
55 #include "auth-options.h"
56 #include "packet.h"
57 #include "mac.h"
58 #include "log.h"
59 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
60 #undef TARGET_OS_MAC
61 #include "zlib.h"
62 #define TARGET_OS_MAC 1
63 #else
64 #include "zlib.h"
65 #endif
66 #include "monitor.h"
67 #ifdef GSSAPI
68 #include "ssh-gss.h"
69 #endif
70 #include "monitor_wrap.h"
71 #include "atomicio.h"
72 #include "monitor_fdpass.h"
73 #include "misc.h"
74 #include "uuencode.h"
75
76 #include "channels.h"
77 #include "session.h"
78 #include "servconf.h"
79 #include "roaming.h"
80
81 /* Imports */
82 extern int compat20;
83 extern z_stream incoming_stream;
84 extern z_stream outgoing_stream;
85 extern struct monitor *pmonitor;
86 extern Buffer loginmsg;
87 extern ServerOptions options;
88
89 void
mm_log_handler(LogLevel level,const char * msg,void * ctx)90 mm_log_handler(LogLevel level, const char *msg, void *ctx)
91 {
92 Buffer log_msg;
93 struct monitor *mon = (struct monitor *)ctx;
94
95 if (mon->m_log_sendfd == -1)
96 fatal("%s: no log channel", __func__);
97
98 buffer_init(&log_msg);
99 /*
100 * Placeholder for packet length. Will be filled in with the actual
101 * packet length once the packet has been constucted. This saves
102 * fragile math.
103 */
104 buffer_put_int(&log_msg, 0);
105
106 buffer_put_int(&log_msg, level);
107 buffer_put_cstring(&log_msg, msg);
108 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4);
109 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg),
110 buffer_len(&log_msg)) != buffer_len(&log_msg))
111 fatal("%s: write: %s", __func__, strerror(errno));
112 buffer_free(&log_msg);
113 }
114
115 int
mm_is_monitor(void)116 mm_is_monitor(void)
117 {
118 /*
119 * m_pid is only set in the privileged part, and
120 * points to the unprivileged child.
121 */
122 return (pmonitor && pmonitor->m_pid > 0);
123 }
124
125 void
mm_request_send(int sock,enum monitor_reqtype type,Buffer * m)126 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
127 {
128 u_int mlen = buffer_len(m);
129 u_char buf[5];
130
131 debug3("%s entering: type %d", __func__, type);
132
133 put_u32(buf, mlen + 1);
134 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
135 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
136 fatal("%s: write: %s", __func__, strerror(errno));
137 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
138 fatal("%s: write: %s", __func__, strerror(errno));
139 }
140
141 void
mm_request_receive(int sock,Buffer * m)142 mm_request_receive(int sock, Buffer *m)
143 {
144 u_char buf[4];
145 u_int msg_len;
146
147 debug3("%s entering", __func__);
148
149 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
150 if (errno == EPIPE)
151 cleanup_exit(255);
152 fatal("%s: read: %s", __func__, strerror(errno));
153 }
154 msg_len = get_u32(buf);
155 if (msg_len > 256 * 1024)
156 fatal("%s: read: bad msg_len %d", __func__, msg_len);
157 buffer_clear(m);
158 buffer_append_space(m, msg_len);
159 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
160 fatal("%s: read: %s", __func__, strerror(errno));
161 }
162
163 void
mm_request_receive_expect(int sock,enum monitor_reqtype type,Buffer * m)164 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
165 {
166 u_char rtype;
167
168 debug3("%s entering: type %d", __func__, type);
169
170 mm_request_receive(sock, m);
171 rtype = buffer_get_char(m);
172 if (rtype != type)
173 fatal("%s: read: rtype %d != type %d", __func__,
174 rtype, type);
175 }
176
177 DH *
mm_choose_dh(int min,int nbits,int max)178 mm_choose_dh(int min, int nbits, int max)
179 {
180 BIGNUM *p, *g;
181 int success = 0;
182 Buffer m;
183
184 buffer_init(&m);
185 buffer_put_int(&m, min);
186 buffer_put_int(&m, nbits);
187 buffer_put_int(&m, max);
188
189 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
190
191 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
192 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
193
194 success = buffer_get_char(&m);
195 if (success == 0)
196 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
197
198 if ((p = BN_new()) == NULL)
199 fatal("%s: BN_new failed", __func__);
200 if ((g = BN_new()) == NULL)
201 fatal("%s: BN_new failed", __func__);
202 buffer_get_bignum2(&m, p);
203 buffer_get_bignum2(&m, g);
204
205 debug3("%s: remaining %d", __func__, buffer_len(&m));
206 buffer_free(&m);
207
208 return (dh_new_group(g, p));
209 }
210
211 int
mm_key_sign(Key * key,u_char ** sigp,u_int * lenp,u_char * data,u_int datalen)212 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
213 {
214 Kex *kex = *pmonitor->m_pkex;
215 Buffer m;
216
217 debug3("%s entering", __func__);
218
219 buffer_init(&m);
220 buffer_put_int(&m, kex->host_key_index(key));
221 buffer_put_string(&m, data, datalen);
222
223 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
224
225 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
226 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
227 *sigp = buffer_get_string(&m, lenp);
228 buffer_free(&m);
229
230 return (0);
231 }
232
233 struct passwd *
mm_getpwnamallow(const char * username)234 mm_getpwnamallow(const char *username)
235 {
236 Buffer m;
237 struct passwd *pw;
238 u_int len, i;
239 ServerOptions *newopts;
240
241 debug3("%s entering", __func__);
242
243 buffer_init(&m);
244 buffer_put_cstring(&m, username);
245
246 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
247
248 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
249 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
250
251 if (buffer_get_char(&m) == 0) {
252 pw = NULL;
253 goto out;
254 }
255 pw = buffer_get_string(&m, &len);
256 if (len != sizeof(struct passwd))
257 fatal("%s: struct passwd size mismatch", __func__);
258 pw->pw_name = buffer_get_string(&m, NULL);
259 pw->pw_passwd = buffer_get_string(&m, NULL);
260 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS
261 pw->pw_gecos = buffer_get_string(&m, NULL);
262 #endif
263 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS
264 pw->pw_class = buffer_get_string(&m, NULL);
265 #endif
266 pw->pw_dir = buffer_get_string(&m, NULL);
267 pw->pw_shell = buffer_get_string(&m, NULL);
268
269 out:
270 /* copy options block as a Match directive may have changed some */
271 newopts = buffer_get_string(&m, &len);
272 if (len != sizeof(*newopts))
273 fatal("%s: option block size mismatch", __func__);
274
275 #define M_CP_STROPT(x) do { \
276 if (newopts->x != NULL) \
277 newopts->x = buffer_get_string(&m, NULL); \
278 } while (0)
279 #define M_CP_STRARRAYOPT(x, nx) do { \
280 for (i = 0; i < newopts->nx; i++) \
281 newopts->x[i] = buffer_get_string(&m, NULL); \
282 } while (0)
283 /* See comment in servconf.h */
284 COPY_MATCH_STRING_OPTS();
285 #undef M_CP_STROPT
286 #undef M_CP_STRARRAYOPT
287
288 copy_set_server_options(&options, newopts, 1);
289 free(newopts);
290
291 buffer_free(&m);
292
293 return (pw);
294 }
295
296 char *
mm_auth2_read_banner(void)297 mm_auth2_read_banner(void)
298 {
299 Buffer m;
300 char *banner;
301
302 debug3("%s entering", __func__);
303
304 buffer_init(&m);
305 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
306 buffer_clear(&m);
307
308 mm_request_receive_expect(pmonitor->m_recvfd,
309 MONITOR_ANS_AUTH2_READ_BANNER, &m);
310 banner = buffer_get_string(&m, NULL);
311 buffer_free(&m);
312
313 /* treat empty banner as missing banner */
314 if (strlen(banner) == 0) {
315 free(banner);
316 banner = NULL;
317 }
318 return (banner);
319 }
320
321 /* Inform the privileged process about service and style */
322
323 void
mm_inform_authserv(char * service,char * style)324 mm_inform_authserv(char *service, char *style)
325 {
326 Buffer m;
327
328 debug3("%s entering", __func__);
329
330 buffer_init(&m);
331 buffer_put_cstring(&m, service);
332 buffer_put_cstring(&m, style ? style : "");
333
334 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
335
336 buffer_free(&m);
337 }
338
339 /* Do the password authentication */
340 int
mm_auth_password(Authctxt * authctxt,char * password)341 mm_auth_password(Authctxt *authctxt, char *password)
342 {
343 Buffer m;
344 int authenticated = 0;
345
346 debug3("%s entering", __func__);
347
348 buffer_init(&m);
349 buffer_put_cstring(&m, password);
350 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
351
352 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
353 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
354
355 authenticated = buffer_get_int(&m);
356
357 buffer_free(&m);
358
359 debug3("%s: user %sauthenticated",
360 __func__, authenticated ? "" : "not ");
361 return (authenticated);
362 }
363
364 int
mm_user_key_allowed(struct passwd * pw,Key * key)365 mm_user_key_allowed(struct passwd *pw, Key *key)
366 {
367 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
368 }
369
370 int
mm_hostbased_key_allowed(struct passwd * pw,char * user,char * host,Key * key)371 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
372 Key *key)
373 {
374 return (mm_key_allowed(MM_HOSTKEY, user, host, key));
375 }
376
377 int
mm_auth_rhosts_rsa_key_allowed(struct passwd * pw,char * user,char * host,Key * key)378 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
379 char *host, Key *key)
380 {
381 int ret;
382
383 key->type = KEY_RSA; /* XXX hack for key_to_blob */
384 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
385 key->type = KEY_RSA1;
386 return (ret);
387 }
388
389 int
mm_key_allowed(enum mm_keytype type,char * user,char * host,Key * key)390 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
391 {
392 Buffer m;
393 u_char *blob;
394 u_int len;
395 int allowed = 0, have_forced = 0;
396
397 debug3("%s entering", __func__);
398
399 /* Convert the key to a blob and the pass it over */
400 if (!key_to_blob(key, &blob, &len))
401 return (0);
402
403 buffer_init(&m);
404 buffer_put_int(&m, type);
405 buffer_put_cstring(&m, user ? user : "");
406 buffer_put_cstring(&m, host ? host : "");
407 buffer_put_string(&m, blob, len);
408 free(blob);
409
410 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
411
412 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
413 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
414
415 allowed = buffer_get_int(&m);
416
417 /* fake forced command */
418 auth_clear_options();
419 have_forced = buffer_get_int(&m);
420 forced_command = have_forced ? xstrdup("true") : NULL;
421
422 buffer_free(&m);
423
424 return (allowed);
425 }
426
427 /*
428 * This key verify needs to send the key type along, because the
429 * privileged parent makes the decision if the key is allowed
430 * for authentication.
431 */
432
433 int
mm_key_verify(Key * key,u_char * sig,u_int siglen,u_char * data,u_int datalen)434 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
435 {
436 Buffer m;
437 u_char *blob;
438 u_int len;
439 int verified = 0;
440
441 debug3("%s entering", __func__);
442
443 /* Convert the key to a blob and the pass it over */
444 if (!key_to_blob(key, &blob, &len))
445 return (0);
446
447 buffer_init(&m);
448 buffer_put_string(&m, blob, len);
449 buffer_put_string(&m, sig, siglen);
450 buffer_put_string(&m, data, datalen);
451 free(blob);
452
453 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
454
455 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
456 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
457
458 verified = buffer_get_int(&m);
459
460 buffer_free(&m);
461
462 return (verified);
463 }
464
465 /* Export key state after authentication */
466 Newkeys *
mm_newkeys_from_blob(u_char * blob,int blen)467 mm_newkeys_from_blob(u_char *blob, int blen)
468 {
469 Buffer b;
470 u_int len;
471 Newkeys *newkey = NULL;
472 Enc *enc;
473 Mac *mac;
474 Comp *comp;
475
476 debug3("%s: %p(%d)", __func__, blob, blen);
477 #ifdef DEBUG_PK
478 dump_base64(stderr, blob, blen);
479 #endif
480 buffer_init(&b);
481 buffer_append(&b, blob, blen);
482
483 newkey = xcalloc(1, sizeof(*newkey));
484 enc = &newkey->enc;
485 mac = &newkey->mac;
486 comp = &newkey->comp;
487
488 /* Enc structure */
489 enc->name = buffer_get_string(&b, NULL);
490 buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
491 enc->enabled = buffer_get_int(&b);
492 enc->block_size = buffer_get_int(&b);
493 enc->key = buffer_get_string(&b, &enc->key_len);
494 enc->iv = buffer_get_string(&b, &enc->iv_len);
495
496 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
497 fatal("%s: bad cipher name %s or pointer %p", __func__,
498 enc->name, enc->cipher);
499
500 /* Mac structure */
501 if (cipher_authlen(enc->cipher) == 0) {
502 mac->name = buffer_get_string(&b, NULL);
503 if (mac->name == NULL || mac_setup(mac, mac->name) == -1)
504 fatal("%s: can not setup mac %s", __func__, mac->name);
505 mac->enabled = buffer_get_int(&b);
506 mac->key = buffer_get_string(&b, &len);
507 if (len > mac->key_len)
508 fatal("%s: bad mac key length: %u > %d", __func__, len,
509 mac->key_len);
510 mac->key_len = len;
511 }
512
513 /* Comp structure */
514 comp->type = buffer_get_int(&b);
515 comp->enabled = buffer_get_int(&b);
516 comp->name = buffer_get_string(&b, NULL);
517
518 len = buffer_len(&b);
519 if (len != 0)
520 error("newkeys_from_blob: remaining bytes in blob %u", len);
521 buffer_free(&b);
522 return (newkey);
523 }
524
525 int
mm_newkeys_to_blob(int mode,u_char ** blobp,u_int * lenp)526 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
527 {
528 Buffer b;
529 int len;
530 Enc *enc;
531 Mac *mac;
532 Comp *comp;
533 Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode);
534
535 debug3("%s: converting %p", __func__, newkey);
536
537 if (newkey == NULL) {
538 error("%s: newkey == NULL", __func__);
539 return 0;
540 }
541 enc = &newkey->enc;
542 mac = &newkey->mac;
543 comp = &newkey->comp;
544
545 buffer_init(&b);
546 /* Enc structure */
547 buffer_put_cstring(&b, enc->name);
548 /* The cipher struct is constant and shared, you export pointer */
549 buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
550 buffer_put_int(&b, enc->enabled);
551 buffer_put_int(&b, enc->block_size);
552 buffer_put_string(&b, enc->key, enc->key_len);
553 packet_get_keyiv(mode, enc->iv, enc->iv_len);
554 buffer_put_string(&b, enc->iv, enc->iv_len);
555
556 /* Mac structure */
557 if (cipher_authlen(enc->cipher) == 0) {
558 buffer_put_cstring(&b, mac->name);
559 buffer_put_int(&b, mac->enabled);
560 buffer_put_string(&b, mac->key, mac->key_len);
561 }
562
563 /* Comp structure */
564 buffer_put_int(&b, comp->type);
565 buffer_put_int(&b, comp->enabled);
566 buffer_put_cstring(&b, comp->name);
567
568 len = buffer_len(&b);
569 if (lenp != NULL)
570 *lenp = len;
571 if (blobp != NULL) {
572 *blobp = xmalloc(len);
573 memcpy(*blobp, buffer_ptr(&b), len);
574 }
575 explicit_bzero(buffer_ptr(&b), len);
576 buffer_free(&b);
577 return len;
578 }
579
580 static void
mm_send_kex(Buffer * m,Kex * kex)581 mm_send_kex(Buffer *m, Kex *kex)
582 {
583 buffer_put_string(m, kex->session_id, kex->session_id_len);
584 buffer_put_int(m, kex->we_need);
585 buffer_put_int(m, kex->hostkey_type);
586 buffer_put_int(m, kex->kex_type);
587 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
588 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
589 buffer_put_int(m, kex->flags);
590 buffer_put_cstring(m, kex->client_version_string);
591 buffer_put_cstring(m, kex->server_version_string);
592 }
593
594 void
mm_send_keystate(struct monitor * monitor)595 mm_send_keystate(struct monitor *monitor)
596 {
597 Buffer m, *input, *output;
598 u_char *blob, *p;
599 u_int bloblen, plen;
600 u_int32_t seqnr, packets;
601 u_int64_t blocks, bytes;
602
603 buffer_init(&m);
604
605 if (!compat20) {
606 u_char iv[24];
607 u_char *key;
608 u_int ivlen, keylen;
609
610 buffer_put_int(&m, packet_get_protocol_flags());
611
612 buffer_put_int(&m, packet_get_ssh1_cipher());
613
614 debug3("%s: Sending ssh1 KEY+IV", __func__);
615 keylen = packet_get_encryption_key(NULL);
616 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
617 keylen = packet_get_encryption_key(key);
618 buffer_put_string(&m, key, keylen);
619 explicit_bzero(key, keylen);
620 free(key);
621
622 ivlen = packet_get_keyiv_len(MODE_OUT);
623 packet_get_keyiv(MODE_OUT, iv, ivlen);
624 buffer_put_string(&m, iv, ivlen);
625 ivlen = packet_get_keyiv_len(MODE_IN);
626 packet_get_keyiv(MODE_IN, iv, ivlen);
627 buffer_put_string(&m, iv, ivlen);
628 goto skip;
629 } else {
630 /* Kex for rekeying */
631 mm_send_kex(&m, *monitor->m_pkex);
632 }
633
634 debug3("%s: Sending new keys: %p %p",
635 __func__, packet_get_newkeys(MODE_OUT),
636 packet_get_newkeys(MODE_IN));
637
638 /* Keys from Kex */
639 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
640 fatal("%s: conversion of newkeys failed", __func__);
641
642 buffer_put_string(&m, blob, bloblen);
643 free(blob);
644
645 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
646 fatal("%s: conversion of newkeys failed", __func__);
647
648 buffer_put_string(&m, blob, bloblen);
649 free(blob);
650
651 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes);
652 buffer_put_int(&m, seqnr);
653 buffer_put_int64(&m, blocks);
654 buffer_put_int(&m, packets);
655 buffer_put_int64(&m, bytes);
656 packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes);
657 buffer_put_int(&m, seqnr);
658 buffer_put_int64(&m, blocks);
659 buffer_put_int(&m, packets);
660 buffer_put_int64(&m, bytes);
661
662 debug3("%s: New keys have been sent", __func__);
663 skip:
664 /* More key context */
665 plen = packet_get_keycontext(MODE_OUT, NULL);
666 p = xmalloc(plen+1);
667 packet_get_keycontext(MODE_OUT, p);
668 buffer_put_string(&m, p, plen);
669 free(p);
670
671 plen = packet_get_keycontext(MODE_IN, NULL);
672 p = xmalloc(plen+1);
673 packet_get_keycontext(MODE_IN, p);
674 buffer_put_string(&m, p, plen);
675 free(p);
676
677 /* Compression state */
678 debug3("%s: Sending compression state", __func__);
679 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
680 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
681
682 /* Network I/O buffers */
683 input = (Buffer *)packet_get_input();
684 output = (Buffer *)packet_get_output();
685 buffer_put_string(&m, buffer_ptr(input), buffer_len(input));
686 buffer_put_string(&m, buffer_ptr(output), buffer_len(output));
687
688 /* Roaming */
689 if (compat20) {
690 buffer_put_int64(&m, get_sent_bytes());
691 buffer_put_int64(&m, get_recv_bytes());
692 }
693
694 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
695 debug3("%s: Finished sending state", __func__);
696
697 buffer_free(&m);
698 }
699
700 int
mm_pty_allocate(int * ptyfd,int * ttyfd,char * namebuf,size_t namebuflen)701 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
702 {
703 Buffer m;
704 char *p, *msg;
705 int success = 0, tmp1 = -1, tmp2 = -1;
706
707 /* Kludge: ensure there are fds free to receive the pty/tty */
708 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
709 (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
710 error("%s: cannot allocate fds for pty", __func__);
711 if (tmp1 > 0)
712 close(tmp1);
713 if (tmp2 > 0)
714 close(tmp2);
715 return 0;
716 }
717 close(tmp1);
718 close(tmp2);
719
720 buffer_init(&m);
721 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
722
723 debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
724 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
725
726 success = buffer_get_int(&m);
727 if (success == 0) {
728 debug3("%s: pty alloc failed", __func__);
729 buffer_free(&m);
730 return (0);
731 }
732 p = buffer_get_string(&m, NULL);
733 msg = buffer_get_string(&m, NULL);
734 buffer_free(&m);
735
736 strlcpy(namebuf, p, namebuflen); /* Possible truncation */
737 free(p);
738
739 buffer_append(&loginmsg, msg, strlen(msg));
740 free(msg);
741
742 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
743 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
744 fatal("%s: receive fds failed", __func__);
745
746 /* Success */
747 return (1);
748 }
749
750 void
mm_session_pty_cleanup2(Session * s)751 mm_session_pty_cleanup2(Session *s)
752 {
753 Buffer m;
754
755 if (s->ttyfd == -1)
756 return;
757 buffer_init(&m);
758 buffer_put_cstring(&m, s->tty);
759 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
760 buffer_free(&m);
761
762 /* closed dup'ed master */
763 if (s->ptymaster != -1 && close(s->ptymaster) < 0)
764 error("close(s->ptymaster/%d): %s",
765 s->ptymaster, strerror(errno));
766
767 /* unlink pty from session */
768 s->ttyfd = -1;
769 }
770
771 #ifdef USE_PAM
772 void
mm_start_pam(Authctxt * authctxt)773 mm_start_pam(Authctxt *authctxt)
774 {
775 Buffer m;
776
777 debug3("%s entering", __func__);
778 if (!options.use_pam)
779 fatal("UsePAM=no, but ended up in %s anyway", __func__);
780
781 buffer_init(&m);
782 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
783
784 buffer_free(&m);
785 }
786
787 u_int
mm_do_pam_account(void)788 mm_do_pam_account(void)
789 {
790 Buffer m;
791 u_int ret;
792 char *msg;
793
794 debug3("%s entering", __func__);
795 if (!options.use_pam)
796 fatal("UsePAM=no, but ended up in %s anyway", __func__);
797
798 buffer_init(&m);
799 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
800
801 mm_request_receive_expect(pmonitor->m_recvfd,
802 MONITOR_ANS_PAM_ACCOUNT, &m);
803 ret = buffer_get_int(&m);
804 msg = buffer_get_string(&m, NULL);
805 buffer_append(&loginmsg, msg, strlen(msg));
806 free(msg);
807
808 buffer_free(&m);
809
810 debug3("%s returning %d", __func__, ret);
811
812 return (ret);
813 }
814
815 void *
mm_sshpam_init_ctx(Authctxt * authctxt)816 mm_sshpam_init_ctx(Authctxt *authctxt)
817 {
818 Buffer m;
819 int success;
820
821 debug3("%s", __func__);
822 buffer_init(&m);
823 buffer_put_cstring(&m, authctxt->user);
824 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
825 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
826 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
827 success = buffer_get_int(&m);
828 if (success == 0) {
829 debug3("%s: pam_init_ctx failed", __func__);
830 buffer_free(&m);
831 return (NULL);
832 }
833 buffer_free(&m);
834 return (authctxt);
835 }
836
837 int
mm_sshpam_query(void * ctx,char ** name,char ** info,u_int * num,char *** prompts,u_int ** echo_on)838 mm_sshpam_query(void *ctx, char **name, char **info,
839 u_int *num, char ***prompts, u_int **echo_on)
840 {
841 Buffer m;
842 u_int i;
843 int ret;
844
845 debug3("%s", __func__);
846 buffer_init(&m);
847 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
848 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
849 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
850 ret = buffer_get_int(&m);
851 debug3("%s: pam_query returned %d", __func__, ret);
852 *name = buffer_get_string(&m, NULL);
853 *info = buffer_get_string(&m, NULL);
854 *num = buffer_get_int(&m);
855 if (*num > PAM_MAX_NUM_MSG)
856 fatal("%s: recieved %u PAM messages, expected <= %u",
857 __func__, *num, PAM_MAX_NUM_MSG);
858 *prompts = xcalloc((*num + 1), sizeof(char *));
859 *echo_on = xcalloc((*num + 1), sizeof(u_int));
860 for (i = 0; i < *num; ++i) {
861 (*prompts)[i] = buffer_get_string(&m, NULL);
862 (*echo_on)[i] = buffer_get_int(&m);
863 }
864 buffer_free(&m);
865 return (ret);
866 }
867
868 int
mm_sshpam_respond(void * ctx,u_int num,char ** resp)869 mm_sshpam_respond(void *ctx, u_int num, char **resp)
870 {
871 Buffer m;
872 u_int i;
873 int ret;
874
875 debug3("%s", __func__);
876 buffer_init(&m);
877 buffer_put_int(&m, num);
878 for (i = 0; i < num; ++i)
879 buffer_put_cstring(&m, resp[i]);
880 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
881 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
882 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
883 ret = buffer_get_int(&m);
884 debug3("%s: pam_respond returned %d", __func__, ret);
885 buffer_free(&m);
886 return (ret);
887 }
888
889 void
mm_sshpam_free_ctx(void * ctxtp)890 mm_sshpam_free_ctx(void *ctxtp)
891 {
892 Buffer m;
893
894 debug3("%s", __func__);
895 buffer_init(&m);
896 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
897 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
898 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
899 buffer_free(&m);
900 }
901 #endif /* USE_PAM */
902
903 /* Request process termination */
904
905 void
mm_terminate(void)906 mm_terminate(void)
907 {
908 Buffer m;
909
910 buffer_init(&m);
911 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
912 buffer_free(&m);
913 }
914
915 int
mm_ssh1_session_key(BIGNUM * num)916 mm_ssh1_session_key(BIGNUM *num)
917 {
918 int rsafail;
919 Buffer m;
920
921 buffer_init(&m);
922 buffer_put_bignum2(&m, num);
923 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
924
925 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
926
927 rsafail = buffer_get_int(&m);
928 buffer_get_bignum2(&m, num);
929
930 buffer_free(&m);
931
932 return (rsafail);
933 }
934
935 static void
mm_chall_setup(char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)936 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
937 char ***prompts, u_int **echo_on)
938 {
939 *name = xstrdup("");
940 *infotxt = xstrdup("");
941 *numprompts = 1;
942 *prompts = xcalloc(*numprompts, sizeof(char *));
943 *echo_on = xcalloc(*numprompts, sizeof(u_int));
944 (*echo_on)[0] = 0;
945 }
946
947 int
mm_bsdauth_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)948 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
949 u_int *numprompts, char ***prompts, u_int **echo_on)
950 {
951 Buffer m;
952 u_int success;
953 char *challenge;
954
955 debug3("%s: entering", __func__);
956
957 buffer_init(&m);
958 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
959
960 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
961 &m);
962 success = buffer_get_int(&m);
963 if (success == 0) {
964 debug3("%s: no challenge", __func__);
965 buffer_free(&m);
966 return (-1);
967 }
968
969 /* Get the challenge, and format the response */
970 challenge = buffer_get_string(&m, NULL);
971 buffer_free(&m);
972
973 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
974 (*prompts)[0] = challenge;
975
976 debug3("%s: received challenge: %s", __func__, challenge);
977
978 return (0);
979 }
980
981 int
mm_bsdauth_respond(void * ctx,u_int numresponses,char ** responses)982 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
983 {
984 Buffer m;
985 int authok;
986
987 debug3("%s: entering", __func__);
988 if (numresponses != 1)
989 return (-1);
990
991 buffer_init(&m);
992 buffer_put_cstring(&m, responses[0]);
993 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
994
995 mm_request_receive_expect(pmonitor->m_recvfd,
996 MONITOR_ANS_BSDAUTHRESPOND, &m);
997
998 authok = buffer_get_int(&m);
999 buffer_free(&m);
1000
1001 return ((authok == 0) ? -1 : 0);
1002 }
1003
1004 #ifdef SKEY
1005 int
mm_skey_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)1006 mm_skey_query(void *ctx, char **name, char **infotxt,
1007 u_int *numprompts, char ***prompts, u_int **echo_on)
1008 {
1009 Buffer m;
1010 u_int success;
1011 char *challenge;
1012
1013 debug3("%s: entering", __func__);
1014
1015 buffer_init(&m);
1016 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1017
1018 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1019 &m);
1020 success = buffer_get_int(&m);
1021 if (success == 0) {
1022 debug3("%s: no challenge", __func__);
1023 buffer_free(&m);
1024 return (-1);
1025 }
1026
1027 /* Get the challenge, and format the response */
1028 challenge = buffer_get_string(&m, NULL);
1029 buffer_free(&m);
1030
1031 debug3("%s: received challenge: %s", __func__, challenge);
1032
1033 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
1034
1035 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1036 free(challenge);
1037
1038 return (0);
1039 }
1040
1041 int
mm_skey_respond(void * ctx,u_int numresponses,char ** responses)1042 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
1043 {
1044 Buffer m;
1045 int authok;
1046
1047 debug3("%s: entering", __func__);
1048 if (numresponses != 1)
1049 return (-1);
1050
1051 buffer_init(&m);
1052 buffer_put_cstring(&m, responses[0]);
1053 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1054
1055 mm_request_receive_expect(pmonitor->m_recvfd,
1056 MONITOR_ANS_SKEYRESPOND, &m);
1057
1058 authok = buffer_get_int(&m);
1059 buffer_free(&m);
1060
1061 return ((authok == 0) ? -1 : 0);
1062 }
1063 #endif /* SKEY */
1064
1065 void
mm_ssh1_session_id(u_char session_id[16])1066 mm_ssh1_session_id(u_char session_id[16])
1067 {
1068 Buffer m;
1069 int i;
1070
1071 debug3("%s entering", __func__);
1072
1073 buffer_init(&m);
1074 for (i = 0; i < 16; i++)
1075 buffer_put_char(&m, session_id[i]);
1076
1077 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1078 buffer_free(&m);
1079 }
1080
1081 int
mm_auth_rsa_key_allowed(struct passwd * pw,BIGNUM * client_n,Key ** rkey)1082 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1083 {
1084 Buffer m;
1085 Key *key;
1086 u_char *blob;
1087 u_int blen;
1088 int allowed = 0, have_forced = 0;
1089
1090 debug3("%s entering", __func__);
1091
1092 buffer_init(&m);
1093 buffer_put_bignum2(&m, client_n);
1094
1095 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1096 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1097
1098 allowed = buffer_get_int(&m);
1099
1100 /* fake forced command */
1101 auth_clear_options();
1102 have_forced = buffer_get_int(&m);
1103 forced_command = have_forced ? xstrdup("true") : NULL;
1104
1105 if (allowed && rkey != NULL) {
1106 blob = buffer_get_string(&m, &blen);
1107 if ((key = key_from_blob(blob, blen)) == NULL)
1108 fatal("%s: key_from_blob failed", __func__);
1109 *rkey = key;
1110 free(blob);
1111 }
1112 buffer_free(&m);
1113
1114 return (allowed);
1115 }
1116
1117 BIGNUM *
mm_auth_rsa_generate_challenge(Key * key)1118 mm_auth_rsa_generate_challenge(Key *key)
1119 {
1120 Buffer m;
1121 BIGNUM *challenge;
1122 u_char *blob;
1123 u_int blen;
1124
1125 debug3("%s entering", __func__);
1126
1127 if ((challenge = BN_new()) == NULL)
1128 fatal("%s: BN_new failed", __func__);
1129
1130 key->type = KEY_RSA; /* XXX cheat for key_to_blob */
1131 if (key_to_blob(key, &blob, &blen) == 0)
1132 fatal("%s: key_to_blob failed", __func__);
1133 key->type = KEY_RSA1;
1134
1135 buffer_init(&m);
1136 buffer_put_string(&m, blob, blen);
1137 free(blob);
1138
1139 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1140 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1141
1142 buffer_get_bignum2(&m, challenge);
1143 buffer_free(&m);
1144
1145 return (challenge);
1146 }
1147
1148 int
mm_auth_rsa_verify_response(Key * key,BIGNUM * p,u_char response[16])1149 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1150 {
1151 Buffer m;
1152 u_char *blob;
1153 u_int blen;
1154 int success = 0;
1155
1156 debug3("%s entering", __func__);
1157
1158 key->type = KEY_RSA; /* XXX cheat for key_to_blob */
1159 if (key_to_blob(key, &blob, &blen) == 0)
1160 fatal("%s: key_to_blob failed", __func__);
1161 key->type = KEY_RSA1;
1162
1163 buffer_init(&m);
1164 buffer_put_string(&m, blob, blen);
1165 buffer_put_string(&m, response, 16);
1166 free(blob);
1167
1168 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1169 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1170
1171 success = buffer_get_int(&m);
1172 buffer_free(&m);
1173
1174 return (success);
1175 }
1176
1177 #ifdef SSH_AUDIT_EVENTS
1178 void
mm_audit_event(ssh_audit_event_t event)1179 mm_audit_event(ssh_audit_event_t event)
1180 {
1181 Buffer m;
1182
1183 debug3("%s entering", __func__);
1184
1185 buffer_init(&m);
1186 buffer_put_int(&m, event);
1187
1188 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1189 buffer_free(&m);
1190 }
1191
1192 void
mm_audit_run_command(const char * command)1193 mm_audit_run_command(const char *command)
1194 {
1195 Buffer m;
1196
1197 debug3("%s entering command %s", __func__, command);
1198
1199 buffer_init(&m);
1200 buffer_put_cstring(&m, command);
1201
1202 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1203 buffer_free(&m);
1204 }
1205 #endif /* SSH_AUDIT_EVENTS */
1206
1207 #ifdef GSSAPI
1208 OM_uint32
mm_ssh_gssapi_server_ctx(Gssctxt ** ctx,gss_OID goid)1209 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1210 {
1211 Buffer m;
1212 OM_uint32 major;
1213
1214 /* Client doesn't get to see the context */
1215 *ctx = NULL;
1216
1217 buffer_init(&m);
1218 buffer_put_string(&m, goid->elements, goid->length);
1219
1220 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1221 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1222
1223 major = buffer_get_int(&m);
1224
1225 buffer_free(&m);
1226 return (major);
1227 }
1228
1229 OM_uint32
mm_ssh_gssapi_accept_ctx(Gssctxt * ctx,gss_buffer_desc * in,gss_buffer_desc * out,OM_uint32 * flags)1230 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1231 gss_buffer_desc *out, OM_uint32 *flags)
1232 {
1233 Buffer m;
1234 OM_uint32 major;
1235 u_int len;
1236
1237 buffer_init(&m);
1238 buffer_put_string(&m, in->value, in->length);
1239
1240 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1241 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1242
1243 major = buffer_get_int(&m);
1244 out->value = buffer_get_string(&m, &len);
1245 out->length = len;
1246 if (flags)
1247 *flags = buffer_get_int(&m);
1248
1249 buffer_free(&m);
1250
1251 return (major);
1252 }
1253
1254 OM_uint32
mm_ssh_gssapi_checkmic(Gssctxt * ctx,gss_buffer_t gssbuf,gss_buffer_t gssmic)1255 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1256 {
1257 Buffer m;
1258 OM_uint32 major;
1259
1260 buffer_init(&m);
1261 buffer_put_string(&m, gssbuf->value, gssbuf->length);
1262 buffer_put_string(&m, gssmic->value, gssmic->length);
1263
1264 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1265 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1266 &m);
1267
1268 major = buffer_get_int(&m);
1269 buffer_free(&m);
1270 return(major);
1271 }
1272
1273 int
mm_ssh_gssapi_userok(char * user)1274 mm_ssh_gssapi_userok(char *user)
1275 {
1276 Buffer m;
1277 int authenticated = 0;
1278
1279 buffer_init(&m);
1280
1281 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1282 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1283 &m);
1284
1285 authenticated = buffer_get_int(&m);
1286
1287 buffer_free(&m);
1288 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1289 return (authenticated);
1290 }
1291 #endif /* GSSAPI */
1292
1293