1 /* $OpenBSD: monitor_wrap.c,v 1.84 2015/02/16 22:13:32 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 #ifdef WITH_OPENSSL
42 #include <openssl/bn.h>
43 #include <openssl/dh.h>
44 #include <openssl/evp.h>
45 #endif
46
47 #include "openbsd-compat/sys-queue.h"
48 #include "xmalloc.h"
49 #include "ssh.h"
50 #ifdef WITH_OPENSSL
51 #include "dh.h"
52 #endif
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"
78 #include "uuencode.h"
79
80 #include "channels.h"
81 #include "session.h"
82 #include "servconf.h"
83 #include "roaming.h"
84
85 #include "ssherr.h"
86
87 /* Imports */
88 extern int compat20;
89 extern z_stream incoming_stream;
90 extern z_stream outgoing_stream;
91 extern struct monitor *pmonitor;
92 extern Buffer loginmsg;
93 extern ServerOptions options;
94
95 void
mm_log_handler(LogLevel level,const char * msg,void * ctx)96 mm_log_handler(LogLevel level, const char *msg, void *ctx)
97 {
98 Buffer log_msg;
99 struct monitor *mon = (struct monitor *)ctx;
100
101 if (mon->m_log_sendfd == -1)
102 fatal("%s: no log channel", __func__);
103
104 buffer_init(&log_msg);
105 /*
106 * Placeholder for packet length. Will be filled in with the actual
107 * packet length once the packet has been constucted. This saves
108 * fragile math.
109 */
110 buffer_put_int(&log_msg, 0);
111
112 buffer_put_int(&log_msg, level);
113 buffer_put_cstring(&log_msg, msg);
114 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4);
115 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg),
116 buffer_len(&log_msg)) != buffer_len(&log_msg))
117 fatal("%s: write: %s", __func__, strerror(errno));
118 buffer_free(&log_msg);
119 }
120
121 int
mm_is_monitor(void)122 mm_is_monitor(void)
123 {
124 /*
125 * m_pid is only set in the privileged part, and
126 * points to the unprivileged child.
127 */
128 return (pmonitor && pmonitor->m_pid > 0);
129 }
130
131 void
mm_request_send(int sock,enum monitor_reqtype type,Buffer * m)132 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
133 {
134 u_int mlen = buffer_len(m);
135 u_char buf[5];
136
137 debug3("%s entering: type %d", __func__, type);
138
139 put_u32(buf, mlen + 1);
140 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
141 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
142 fatal("%s: write: %s", __func__, strerror(errno));
143 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
144 fatal("%s: write: %s", __func__, strerror(errno));
145 }
146
147 void
mm_request_receive(int sock,Buffer * m)148 mm_request_receive(int sock, Buffer *m)
149 {
150 u_char buf[4];
151 u_int msg_len;
152
153 debug3("%s entering", __func__);
154
155 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
156 if (errno == EPIPE) {
157 error("%s: socket closed", __func__);
158 cleanup_exit(255);
159 }
160 fatal("%s: read: %s", __func__, strerror(errno));
161 }
162 msg_len = get_u32(buf);
163 if (msg_len > 256 * 1024)
164 fatal("%s: read: bad msg_len %d", __func__, msg_len);
165 buffer_clear(m);
166 buffer_append_space(m, msg_len);
167 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
168 fatal("%s: read: %s", __func__, strerror(errno));
169 }
170
171 void
mm_request_receive_expect(int sock,enum monitor_reqtype type,Buffer * m)172 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
173 {
174 u_char rtype;
175
176 debug3("%s entering: type %d", __func__, type);
177
178 mm_request_receive(sock, m);
179 rtype = buffer_get_char(m);
180 if (rtype != type)
181 fatal("%s: read: rtype %d != type %d", __func__,
182 rtype, type);
183 }
184
185 #ifdef WITH_OPENSSL
186 DH *
mm_choose_dh(int min,int nbits,int max)187 mm_choose_dh(int min, int nbits, int max)
188 {
189 BIGNUM *p, *g;
190 int success = 0;
191 Buffer m;
192
193 buffer_init(&m);
194 buffer_put_int(&m, min);
195 buffer_put_int(&m, nbits);
196 buffer_put_int(&m, max);
197
198 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
199
200 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
201 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
202
203 success = buffer_get_char(&m);
204 if (success == 0)
205 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
206
207 if ((p = BN_new()) == NULL)
208 fatal("%s: BN_new failed", __func__);
209 if ((g = BN_new()) == NULL)
210 fatal("%s: BN_new failed", __func__);
211 buffer_get_bignum2(&m, p);
212 buffer_get_bignum2(&m, g);
213
214 debug3("%s: remaining %d", __func__, buffer_len(&m));
215 buffer_free(&m);
216
217 return (dh_new_group(g, p));
218 }
219 #endif
220
221 int
mm_key_sign(Key * key,u_char ** sigp,u_int * lenp,const u_char * data,u_int datalen)222 mm_key_sign(Key *key, u_char **sigp, u_int *lenp,
223 const u_char *data, u_int datalen)
224 {
225 struct kex *kex = *pmonitor->m_pkex;
226 Buffer m;
227
228 debug3("%s entering", __func__);
229
230 buffer_init(&m);
231 buffer_put_int(&m, kex->host_key_index(key, 0, active_state));
232 buffer_put_string(&m, data, datalen);
233
234 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
235
236 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
237 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
238 *sigp = buffer_get_string(&m, lenp);
239 buffer_free(&m);
240
241 return (0);
242 }
243
244 struct passwd *
mm_getpwnamallow(const char * username)245 mm_getpwnamallow(const char *username)
246 {
247 Buffer m;
248 struct passwd *pw;
249 u_int len, i;
250 ServerOptions *newopts;
251
252 debug3("%s entering", __func__);
253
254 buffer_init(&m);
255 buffer_put_cstring(&m, username);
256
257 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
258
259 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
260 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
261
262 if (buffer_get_char(&m) == 0) {
263 pw = NULL;
264 goto out;
265 }
266 pw = buffer_get_string(&m, &len);
267 if (len != sizeof(struct passwd))
268 fatal("%s: struct passwd size mismatch", __func__);
269 pw->pw_name = buffer_get_string(&m, NULL);
270 pw->pw_passwd = buffer_get_string(&m, NULL);
271 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS
272 pw->pw_gecos = buffer_get_string(&m, NULL);
273 #endif
274 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS
275 pw->pw_class = buffer_get_string(&m, NULL);
276 #endif
277 pw->pw_dir = buffer_get_string(&m, NULL);
278 pw->pw_shell = buffer_get_string(&m, NULL);
279
280 out:
281 /* copy options block as a Match directive may have changed some */
282 newopts = buffer_get_string(&m, &len);
283 if (len != sizeof(*newopts))
284 fatal("%s: option block size mismatch", __func__);
285
286 #define M_CP_STROPT(x) do { \
287 if (newopts->x != NULL) \
288 newopts->x = buffer_get_string(&m, NULL); \
289 } while (0)
290 #define M_CP_STRARRAYOPT(x, nx) do { \
291 for (i = 0; i < newopts->nx; i++) \
292 newopts->x[i] = buffer_get_string(&m, NULL); \
293 } while (0)
294 /* See comment in servconf.h */
295 COPY_MATCH_STRING_OPTS();
296 #undef M_CP_STROPT
297 #undef M_CP_STRARRAYOPT
298
299 copy_set_server_options(&options, newopts, 1);
300 free(newopts);
301
302 buffer_free(&m);
303
304 return (pw);
305 }
306
307 char *
mm_auth2_read_banner(void)308 mm_auth2_read_banner(void)
309 {
310 Buffer m;
311 char *banner;
312
313 debug3("%s entering", __func__);
314
315 buffer_init(&m);
316 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
317 buffer_clear(&m);
318
319 mm_request_receive_expect(pmonitor->m_recvfd,
320 MONITOR_ANS_AUTH2_READ_BANNER, &m);
321 banner = buffer_get_string(&m, NULL);
322 buffer_free(&m);
323
324 /* treat empty banner as missing banner */
325 if (strlen(banner) == 0) {
326 free(banner);
327 banner = NULL;
328 }
329 return (banner);
330 }
331
332 /* Inform the privileged process about service and style */
333
334 void
mm_inform_authserv(char * service,char * style)335 mm_inform_authserv(char *service, char *style)
336 {
337 Buffer m;
338
339 debug3("%s entering", __func__);
340
341 buffer_init(&m);
342 buffer_put_cstring(&m, service);
343 buffer_put_cstring(&m, style ? style : "");
344
345 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
346
347 buffer_free(&m);
348 }
349
350 /* Do the password authentication */
351 int
mm_auth_password(Authctxt * authctxt,char * password)352 mm_auth_password(Authctxt *authctxt, char *password)
353 {
354 Buffer m;
355 int authenticated = 0;
356
357 debug3("%s entering", __func__);
358
359 buffer_init(&m);
360 buffer_put_cstring(&m, password);
361 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
362
363 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
364 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
365
366 authenticated = buffer_get_int(&m);
367
368 buffer_free(&m);
369
370 debug3("%s: user %sauthenticated",
371 __func__, authenticated ? "" : "not ");
372 return (authenticated);
373 }
374
375 int
mm_user_key_allowed(struct passwd * pw,Key * key)376 mm_user_key_allowed(struct passwd *pw, Key *key)
377 {
378 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
379 }
380
381 int
mm_hostbased_key_allowed(struct passwd * pw,char * user,char * host,Key * key)382 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
383 Key *key)
384 {
385 return (mm_key_allowed(MM_HOSTKEY, user, host, key));
386 }
387
388 int
mm_auth_rhosts_rsa_key_allowed(struct passwd * pw,char * user,char * host,Key * key)389 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
390 char *host, Key *key)
391 {
392 int ret;
393
394 key->type = KEY_RSA; /* XXX hack for key_to_blob */
395 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
396 key->type = KEY_RSA1;
397 return (ret);
398 }
399
400 int
mm_key_allowed(enum mm_keytype type,char * user,char * host,Key * key)401 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
402 {
403 Buffer m;
404 u_char *blob;
405 u_int len;
406 int allowed = 0, have_forced = 0;
407
408 debug3("%s entering", __func__);
409
410 /* Convert the key to a blob and the pass it over */
411 if (!key_to_blob(key, &blob, &len))
412 return (0);
413
414 buffer_init(&m);
415 buffer_put_int(&m, type);
416 buffer_put_cstring(&m, user ? user : "");
417 buffer_put_cstring(&m, host ? host : "");
418 buffer_put_string(&m, blob, len);
419 free(blob);
420
421 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
422
423 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
424 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
425
426 allowed = buffer_get_int(&m);
427
428 /* fake forced command */
429 auth_clear_options();
430 have_forced = buffer_get_int(&m);
431 forced_command = have_forced ? xstrdup("true") : NULL;
432
433 buffer_free(&m);
434
435 return (allowed);
436 }
437
438 /*
439 * This key verify needs to send the key type along, because the
440 * privileged parent makes the decision if the key is allowed
441 * for authentication.
442 */
443
444 int
mm_key_verify(Key * key,u_char * sig,u_int siglen,u_char * data,u_int datalen)445 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
446 {
447 Buffer m;
448 u_char *blob;
449 u_int len;
450 int verified = 0;
451
452 debug3("%s entering", __func__);
453
454 /* Convert the key to a blob and the pass it over */
455 if (!key_to_blob(key, &blob, &len))
456 return (0);
457
458 buffer_init(&m);
459 buffer_put_string(&m, blob, len);
460 buffer_put_string(&m, sig, siglen);
461 buffer_put_string(&m, data, datalen);
462 free(blob);
463
464 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
465
466 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
467 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
468
469 verified = buffer_get_int(&m);
470
471 buffer_free(&m);
472
473 return (verified);
474 }
475
476 void
mm_send_keystate(struct monitor * monitor)477 mm_send_keystate(struct monitor *monitor)
478 {
479 struct ssh *ssh = active_state; /* XXX */
480 struct sshbuf *m;
481 int r;
482
483 if ((m = sshbuf_new()) == NULL)
484 fatal("%s: sshbuf_new failed", __func__);
485 if ((r = ssh_packet_get_state(ssh, m)) != 0)
486 fatal("%s: get_state failed: %s",
487 __func__, ssh_err(r));
488 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
489 debug3("%s: Finished sending state", __func__);
490 sshbuf_free(m);
491 }
492
493 int
mm_pty_allocate(int * ptyfd,int * ttyfd,char * namebuf,size_t namebuflen)494 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
495 {
496 Buffer m;
497 char *p, *msg;
498 int success = 0, tmp1 = -1, tmp2 = -1;
499
500 /* Kludge: ensure there are fds free to receive the pty/tty */
501 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
502 (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
503 error("%s: cannot allocate fds for pty", __func__);
504 if (tmp1 > 0)
505 close(tmp1);
506 if (tmp2 > 0)
507 close(tmp2);
508 return 0;
509 }
510 close(tmp1);
511 close(tmp2);
512
513 buffer_init(&m);
514 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
515
516 debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
517 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
518
519 success = buffer_get_int(&m);
520 if (success == 0) {
521 debug3("%s: pty alloc failed", __func__);
522 buffer_free(&m);
523 return (0);
524 }
525 p = buffer_get_string(&m, NULL);
526 msg = buffer_get_string(&m, NULL);
527 buffer_free(&m);
528
529 strlcpy(namebuf, p, namebuflen); /* Possible truncation */
530 free(p);
531
532 buffer_append(&loginmsg, msg, strlen(msg));
533 free(msg);
534
535 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
536 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
537 fatal("%s: receive fds failed", __func__);
538
539 /* Success */
540 return (1);
541 }
542
543 void
mm_session_pty_cleanup2(Session * s)544 mm_session_pty_cleanup2(Session *s)
545 {
546 Buffer m;
547
548 if (s->ttyfd == -1)
549 return;
550 buffer_init(&m);
551 buffer_put_cstring(&m, s->tty);
552 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
553 buffer_free(&m);
554
555 /* closed dup'ed master */
556 if (s->ptymaster != -1 && close(s->ptymaster) < 0)
557 error("close(s->ptymaster/%d): %s",
558 s->ptymaster, strerror(errno));
559
560 /* unlink pty from session */
561 s->ttyfd = -1;
562 }
563
564 #ifdef USE_PAM
565 void
mm_start_pam(Authctxt * authctxt)566 mm_start_pam(Authctxt *authctxt)
567 {
568 Buffer m;
569
570 debug3("%s entering", __func__);
571 if (!options.use_pam)
572 fatal("UsePAM=no, but ended up in %s anyway", __func__);
573
574 buffer_init(&m);
575 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
576
577 buffer_free(&m);
578 }
579
580 u_int
mm_do_pam_account(void)581 mm_do_pam_account(void)
582 {
583 Buffer m;
584 u_int ret;
585 char *msg;
586
587 debug3("%s entering", __func__);
588 if (!options.use_pam)
589 fatal("UsePAM=no, but ended up in %s anyway", __func__);
590
591 buffer_init(&m);
592 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
593
594 mm_request_receive_expect(pmonitor->m_recvfd,
595 MONITOR_ANS_PAM_ACCOUNT, &m);
596 ret = buffer_get_int(&m);
597 msg = buffer_get_string(&m, NULL);
598 buffer_append(&loginmsg, msg, strlen(msg));
599 free(msg);
600
601 buffer_free(&m);
602
603 debug3("%s returning %d", __func__, ret);
604
605 return (ret);
606 }
607
608 void *
mm_sshpam_init_ctx(Authctxt * authctxt)609 mm_sshpam_init_ctx(Authctxt *authctxt)
610 {
611 Buffer m;
612 int success;
613
614 debug3("%s", __func__);
615 buffer_init(&m);
616 buffer_put_cstring(&m, authctxt->user);
617 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
618 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
619 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
620 success = buffer_get_int(&m);
621 if (success == 0) {
622 debug3("%s: pam_init_ctx failed", __func__);
623 buffer_free(&m);
624 return (NULL);
625 }
626 buffer_free(&m);
627 return (authctxt);
628 }
629
630 int
mm_sshpam_query(void * ctx,char ** name,char ** info,u_int * num,char *** prompts,u_int ** echo_on)631 mm_sshpam_query(void *ctx, char **name, char **info,
632 u_int *num, char ***prompts, u_int **echo_on)
633 {
634 Buffer m;
635 u_int i;
636 int ret;
637
638 debug3("%s", __func__);
639 buffer_init(&m);
640 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
641 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
642 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
643 ret = buffer_get_int(&m);
644 debug3("%s: pam_query returned %d", __func__, ret);
645 *name = buffer_get_string(&m, NULL);
646 *info = buffer_get_string(&m, NULL);
647 *num = buffer_get_int(&m);
648 if (*num > PAM_MAX_NUM_MSG)
649 fatal("%s: recieved %u PAM messages, expected <= %u",
650 __func__, *num, PAM_MAX_NUM_MSG);
651 *prompts = xcalloc((*num + 1), sizeof(char *));
652 *echo_on = xcalloc((*num + 1), sizeof(u_int));
653 for (i = 0; i < *num; ++i) {
654 (*prompts)[i] = buffer_get_string(&m, NULL);
655 (*echo_on)[i] = buffer_get_int(&m);
656 }
657 buffer_free(&m);
658 return (ret);
659 }
660
661 int
mm_sshpam_respond(void * ctx,u_int num,char ** resp)662 mm_sshpam_respond(void *ctx, u_int num, char **resp)
663 {
664 Buffer m;
665 u_int i;
666 int ret;
667
668 debug3("%s", __func__);
669 buffer_init(&m);
670 buffer_put_int(&m, num);
671 for (i = 0; i < num; ++i)
672 buffer_put_cstring(&m, resp[i]);
673 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
674 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
675 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
676 ret = buffer_get_int(&m);
677 debug3("%s: pam_respond returned %d", __func__, ret);
678 buffer_free(&m);
679 return (ret);
680 }
681
682 void
mm_sshpam_free_ctx(void * ctxtp)683 mm_sshpam_free_ctx(void *ctxtp)
684 {
685 Buffer m;
686
687 debug3("%s", __func__);
688 buffer_init(&m);
689 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
690 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
691 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
692 buffer_free(&m);
693 }
694 #endif /* USE_PAM */
695
696 /* Request process termination */
697
698 void
mm_terminate(void)699 mm_terminate(void)
700 {
701 Buffer m;
702
703 buffer_init(&m);
704 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
705 buffer_free(&m);
706 }
707
708 #ifdef WITH_SSH1
709 int
mm_ssh1_session_key(BIGNUM * num)710 mm_ssh1_session_key(BIGNUM *num)
711 {
712 int rsafail;
713 Buffer m;
714
715 buffer_init(&m);
716 buffer_put_bignum2(&m, num);
717 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
718
719 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
720
721 rsafail = buffer_get_int(&m);
722 buffer_get_bignum2(&m, num);
723
724 buffer_free(&m);
725
726 return (rsafail);
727 }
728 #endif
729
730 static void
mm_chall_setup(char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)731 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
732 char ***prompts, u_int **echo_on)
733 {
734 *name = xstrdup("");
735 *infotxt = xstrdup("");
736 *numprompts = 1;
737 *prompts = xcalloc(*numprompts, sizeof(char *));
738 *echo_on = xcalloc(*numprompts, sizeof(u_int));
739 (*echo_on)[0] = 0;
740 }
741
742 int
mm_bsdauth_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)743 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
744 u_int *numprompts, char ***prompts, u_int **echo_on)
745 {
746 Buffer m;
747 u_int success;
748 char *challenge;
749
750 debug3("%s: entering", __func__);
751
752 buffer_init(&m);
753 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
754
755 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
756 &m);
757 success = buffer_get_int(&m);
758 if (success == 0) {
759 debug3("%s: no challenge", __func__);
760 buffer_free(&m);
761 return (-1);
762 }
763
764 /* Get the challenge, and format the response */
765 challenge = buffer_get_string(&m, NULL);
766 buffer_free(&m);
767
768 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
769 (*prompts)[0] = challenge;
770
771 debug3("%s: received challenge: %s", __func__, challenge);
772
773 return (0);
774 }
775
776 int
mm_bsdauth_respond(void * ctx,u_int numresponses,char ** responses)777 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
778 {
779 Buffer m;
780 int authok;
781
782 debug3("%s: entering", __func__);
783 if (numresponses != 1)
784 return (-1);
785
786 buffer_init(&m);
787 buffer_put_cstring(&m, responses[0]);
788 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
789
790 mm_request_receive_expect(pmonitor->m_recvfd,
791 MONITOR_ANS_BSDAUTHRESPOND, &m);
792
793 authok = buffer_get_int(&m);
794 buffer_free(&m);
795
796 return ((authok == 0) ? -1 : 0);
797 }
798
799 #ifdef SKEY
800 int
mm_skey_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)801 mm_skey_query(void *ctx, char **name, char **infotxt,
802 u_int *numprompts, char ***prompts, u_int **echo_on)
803 {
804 Buffer m;
805 u_int success;
806 char *challenge;
807
808 debug3("%s: entering", __func__);
809
810 buffer_init(&m);
811 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
812
813 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
814 &m);
815 success = buffer_get_int(&m);
816 if (success == 0) {
817 debug3("%s: no challenge", __func__);
818 buffer_free(&m);
819 return (-1);
820 }
821
822 /* Get the challenge, and format the response */
823 challenge = buffer_get_string(&m, NULL);
824 buffer_free(&m);
825
826 debug3("%s: received challenge: %s", __func__, challenge);
827
828 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
829
830 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
831 free(challenge);
832
833 return (0);
834 }
835
836 int
mm_skey_respond(void * ctx,u_int numresponses,char ** responses)837 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
838 {
839 Buffer m;
840 int authok;
841
842 debug3("%s: entering", __func__);
843 if (numresponses != 1)
844 return (-1);
845
846 buffer_init(&m);
847 buffer_put_cstring(&m, responses[0]);
848 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
849
850 mm_request_receive_expect(pmonitor->m_recvfd,
851 MONITOR_ANS_SKEYRESPOND, &m);
852
853 authok = buffer_get_int(&m);
854 buffer_free(&m);
855
856 return ((authok == 0) ? -1 : 0);
857 }
858 #endif /* SKEY */
859
860 void
mm_ssh1_session_id(u_char session_id[16])861 mm_ssh1_session_id(u_char session_id[16])
862 {
863 Buffer m;
864 int i;
865
866 debug3("%s entering", __func__);
867
868 buffer_init(&m);
869 for (i = 0; i < 16; i++)
870 buffer_put_char(&m, session_id[i]);
871
872 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
873 buffer_free(&m);
874 }
875
876 #ifdef WITH_SSH1
877 int
mm_auth_rsa_key_allowed(struct passwd * pw,BIGNUM * client_n,Key ** rkey)878 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
879 {
880 Buffer m;
881 Key *key;
882 u_char *blob;
883 u_int blen;
884 int allowed = 0, have_forced = 0;
885
886 debug3("%s entering", __func__);
887
888 buffer_init(&m);
889 buffer_put_bignum2(&m, client_n);
890
891 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
892 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
893
894 allowed = buffer_get_int(&m);
895
896 /* fake forced command */
897 auth_clear_options();
898 have_forced = buffer_get_int(&m);
899 forced_command = have_forced ? xstrdup("true") : NULL;
900
901 if (allowed && rkey != NULL) {
902 blob = buffer_get_string(&m, &blen);
903 if ((key = key_from_blob(blob, blen)) == NULL)
904 fatal("%s: key_from_blob failed", __func__);
905 *rkey = key;
906 free(blob);
907 }
908 buffer_free(&m);
909
910 return (allowed);
911 }
912
913 BIGNUM *
mm_auth_rsa_generate_challenge(Key * key)914 mm_auth_rsa_generate_challenge(Key *key)
915 {
916 Buffer m;
917 BIGNUM *challenge;
918 u_char *blob;
919 u_int blen;
920
921 debug3("%s entering", __func__);
922
923 if ((challenge = BN_new()) == NULL)
924 fatal("%s: BN_new failed", __func__);
925
926 key->type = KEY_RSA; /* XXX cheat for key_to_blob */
927 if (key_to_blob(key, &blob, &blen) == 0)
928 fatal("%s: key_to_blob failed", __func__);
929 key->type = KEY_RSA1;
930
931 buffer_init(&m);
932 buffer_put_string(&m, blob, blen);
933 free(blob);
934
935 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
936 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
937
938 buffer_get_bignum2(&m, challenge);
939 buffer_free(&m);
940
941 return (challenge);
942 }
943
944 int
mm_auth_rsa_verify_response(Key * key,BIGNUM * p,u_char response[16])945 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
946 {
947 Buffer m;
948 u_char *blob;
949 u_int blen;
950 int success = 0;
951
952 debug3("%s entering", __func__);
953
954 key->type = KEY_RSA; /* XXX cheat for key_to_blob */
955 if (key_to_blob(key, &blob, &blen) == 0)
956 fatal("%s: key_to_blob failed", __func__);
957 key->type = KEY_RSA1;
958
959 buffer_init(&m);
960 buffer_put_string(&m, blob, blen);
961 buffer_put_string(&m, response, 16);
962 free(blob);
963
964 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
965 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
966
967 success = buffer_get_int(&m);
968 buffer_free(&m);
969
970 return (success);
971 }
972 #endif
973
974 #ifdef SSH_AUDIT_EVENTS
975 void
mm_audit_event(ssh_audit_event_t event)976 mm_audit_event(ssh_audit_event_t event)
977 {
978 Buffer m;
979
980 debug3("%s entering", __func__);
981
982 buffer_init(&m);
983 buffer_put_int(&m, event);
984
985 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
986 buffer_free(&m);
987 }
988
989 void
mm_audit_run_command(const char * command)990 mm_audit_run_command(const char *command)
991 {
992 Buffer m;
993
994 debug3("%s entering command %s", __func__, command);
995
996 buffer_init(&m);
997 buffer_put_cstring(&m, command);
998
999 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1000 buffer_free(&m);
1001 }
1002 #endif /* SSH_AUDIT_EVENTS */
1003
1004 #ifdef GSSAPI
1005 OM_uint32
mm_ssh_gssapi_server_ctx(Gssctxt ** ctx,gss_OID goid)1006 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1007 {
1008 Buffer m;
1009 OM_uint32 major;
1010
1011 /* Client doesn't get to see the context */
1012 *ctx = NULL;
1013
1014 buffer_init(&m);
1015 buffer_put_string(&m, goid->elements, goid->length);
1016
1017 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1018 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1019
1020 major = buffer_get_int(&m);
1021
1022 buffer_free(&m);
1023 return (major);
1024 }
1025
1026 OM_uint32
mm_ssh_gssapi_accept_ctx(Gssctxt * ctx,gss_buffer_desc * in,gss_buffer_desc * out,OM_uint32 * flags)1027 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1028 gss_buffer_desc *out, OM_uint32 *flags)
1029 {
1030 Buffer m;
1031 OM_uint32 major;
1032 u_int len;
1033
1034 buffer_init(&m);
1035 buffer_put_string(&m, in->value, in->length);
1036
1037 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1038 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1039
1040 major = buffer_get_int(&m);
1041 out->value = buffer_get_string(&m, &len);
1042 out->length = len;
1043 if (flags)
1044 *flags = buffer_get_int(&m);
1045
1046 buffer_free(&m);
1047
1048 return (major);
1049 }
1050
1051 OM_uint32
mm_ssh_gssapi_checkmic(Gssctxt * ctx,gss_buffer_t gssbuf,gss_buffer_t gssmic)1052 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1053 {
1054 Buffer m;
1055 OM_uint32 major;
1056
1057 buffer_init(&m);
1058 buffer_put_string(&m, gssbuf->value, gssbuf->length);
1059 buffer_put_string(&m, gssmic->value, gssmic->length);
1060
1061 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1062 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1063 &m);
1064
1065 major = buffer_get_int(&m);
1066 buffer_free(&m);
1067 return(major);
1068 }
1069
1070 int
mm_ssh_gssapi_userok(char * user)1071 mm_ssh_gssapi_userok(char *user)
1072 {
1073 Buffer m;
1074 int authenticated = 0;
1075
1076 buffer_init(&m);
1077
1078 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1079 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1080 &m);
1081
1082 authenticated = buffer_get_int(&m);
1083
1084 buffer_free(&m);
1085 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1086 return (authenticated);
1087 }
1088 #endif /* GSSAPI */
1089
1090