kqueue: Nuke unused code
[dragonfly.git] / crypto / openssh / monitor.c
blobdbe29f128dbe644f5da21fe1cc8bef03d82fcccd
1 /* $OpenBSD: monitor.c,v 1.135 2014/07/15 15:54:14 millert Exp $ */
2 /*
3 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4 * Copyright 2002 Markus Friedl <markus@openbsd.org>
5 * All rights reserved.
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.
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.
28 #include "includes.h"
30 #include <sys/types.h>
31 #include <sys/param.h>
32 #include <sys/socket.h>
33 #include "openbsd-compat/sys-tree.h"
34 #include <sys/wait.h>
36 #include <errno.h>
37 #include <fcntl.h>
38 #ifdef HAVE_PATHS_H
39 #include <paths.h>
40 #endif
41 #include <pwd.h>
42 #include <signal.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <stdarg.h>
46 #include <stdio.h>
47 #include <unistd.h>
48 #ifdef HAVE_POLL_H
49 #include <poll.h>
50 #else
51 # ifdef HAVE_SYS_POLL_H
52 # include <sys/poll.h>
53 # endif
54 #endif
56 #ifdef SKEY
57 #include <skey.h>
58 #endif
60 #ifdef WITH_OPENSSL
61 #include <openssl/dh.h>
62 #endif
64 #include "openbsd-compat/sys-queue.h"
65 #include "atomicio.h"
66 #include "xmalloc.h"
67 #include "ssh.h"
68 #include "key.h"
69 #include "buffer.h"
70 #include "hostfile.h"
71 #include "auth.h"
72 #include "cipher.h"
73 #include "kex.h"
74 #include "dh.h"
75 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
76 #undef TARGET_OS_MAC
77 #include "zlib.h"
78 #define TARGET_OS_MAC 1
79 #else
80 #include "zlib.h"
81 #endif
82 #include "packet.h"
83 #include "auth-options.h"
84 #include "sshpty.h"
85 #include "channels.h"
86 #include "session.h"
87 #include "sshlogin.h"
88 #include "canohost.h"
89 #include "log.h"
90 #include "misc.h"
91 #include "servconf.h"
92 #include "monitor.h"
93 #include "monitor_mm.h"
94 #ifdef GSSAPI
95 #include "ssh-gss.h"
96 #endif
97 #include "monitor_wrap.h"
98 #include "monitor_fdpass.h"
99 #include "compat.h"
100 #include "ssh2.h"
101 #include "roaming.h"
102 #include "authfd.h"
104 #ifdef GSSAPI
105 static Gssctxt *gsscontext = NULL;
106 #endif
108 /* Imports */
109 extern ServerOptions options;
110 extern u_int utmp_len;
111 extern Newkeys *current_keys[];
112 extern z_stream incoming_stream;
113 extern z_stream outgoing_stream;
114 extern u_char session_id[];
115 extern Buffer auth_debug;
116 extern int auth_debug_init;
117 extern Buffer loginmsg;
119 /* State exported from the child */
121 struct {
122 z_stream incoming;
123 z_stream outgoing;
124 u_char *keyin;
125 u_int keyinlen;
126 u_char *keyout;
127 u_int keyoutlen;
128 u_char *ivin;
129 u_int ivinlen;
130 u_char *ivout;
131 u_int ivoutlen;
132 u_char *ssh1key;
133 u_int ssh1keylen;
134 int ssh1cipher;
135 int ssh1protoflags;
136 u_char *input;
137 u_int ilen;
138 u_char *output;
139 u_int olen;
140 u_int64_t sent_bytes;
141 u_int64_t recv_bytes;
142 } child_state;
144 /* Functions on the monitor that answer unprivileged requests */
146 int mm_answer_moduli(int, Buffer *);
147 int mm_answer_sign(int, Buffer *);
148 int mm_answer_pwnamallow(int, Buffer *);
149 int mm_answer_auth2_read_banner(int, Buffer *);
150 int mm_answer_authserv(int, Buffer *);
151 int mm_answer_authpassword(int, Buffer *);
152 int mm_answer_bsdauthquery(int, Buffer *);
153 int mm_answer_bsdauthrespond(int, Buffer *);
154 int mm_answer_skeyquery(int, Buffer *);
155 int mm_answer_skeyrespond(int, Buffer *);
156 int mm_answer_keyallowed(int, Buffer *);
157 int mm_answer_keyverify(int, Buffer *);
158 int mm_answer_pty(int, Buffer *);
159 int mm_answer_pty_cleanup(int, Buffer *);
160 int mm_answer_term(int, Buffer *);
161 int mm_answer_rsa_keyallowed(int, Buffer *);
162 int mm_answer_rsa_challenge(int, Buffer *);
163 int mm_answer_rsa_response(int, Buffer *);
164 int mm_answer_sesskey(int, Buffer *);
165 int mm_answer_sessid(int, Buffer *);
167 #ifdef USE_PAM
168 int mm_answer_pam_start(int, Buffer *);
169 int mm_answer_pam_account(int, Buffer *);
170 int mm_answer_pam_init_ctx(int, Buffer *);
171 int mm_answer_pam_query(int, Buffer *);
172 int mm_answer_pam_respond(int, Buffer *);
173 int mm_answer_pam_free_ctx(int, Buffer *);
174 #endif
176 #ifdef GSSAPI
177 int mm_answer_gss_setup_ctx(int, Buffer *);
178 int mm_answer_gss_accept_ctx(int, Buffer *);
179 int mm_answer_gss_userok(int, Buffer *);
180 int mm_answer_gss_checkmic(int, Buffer *);
181 #endif
183 #ifdef SSH_AUDIT_EVENTS
184 int mm_answer_audit_event(int, Buffer *);
185 int mm_answer_audit_command(int, Buffer *);
186 #endif
188 static int monitor_read_log(struct monitor *);
190 static Authctxt *authctxt;
192 #ifdef WITH_SSH1
193 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
194 #endif
196 /* local state for key verify */
197 static u_char *key_blob = NULL;
198 static u_int key_bloblen = 0;
199 static int key_blobtype = MM_NOKEY;
200 static char *hostbased_cuser = NULL;
201 static char *hostbased_chost = NULL;
202 static char *auth_method = "unknown";
203 static char *auth_submethod = NULL;
204 static u_int session_id2_len = 0;
205 static u_char *session_id2 = NULL;
206 static pid_t monitor_child_pid;
208 struct mon_table {
209 enum monitor_reqtype type;
210 int flags;
211 int (*f)(int, Buffer *);
214 #define MON_ISAUTH 0x0004 /* Required for Authentication */
215 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
216 #define MON_ONCE 0x0010 /* Disable after calling */
217 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
219 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
221 #define MON_PERMIT 0x1000 /* Request is permitted */
223 struct mon_table mon_dispatch_proto20[] = {
224 #ifdef WITH_OPENSSL
225 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
226 #endif
227 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
228 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
229 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
230 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
231 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
232 #ifdef USE_PAM
233 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
234 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
235 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
236 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
237 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
238 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
239 #endif
240 #ifdef SSH_AUDIT_EVENTS
241 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
242 #endif
243 #ifdef BSD_AUTH
244 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
245 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
246 #endif
247 #ifdef SKEY
248 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
249 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
250 #endif
251 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
252 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
253 #ifdef GSSAPI
254 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
255 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
256 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
257 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
258 #endif
259 {0, 0, NULL}
262 struct mon_table mon_dispatch_postauth20[] = {
263 #ifdef WITH_OPENSSL
264 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
265 #endif
266 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
267 {MONITOR_REQ_PTY, 0, mm_answer_pty},
268 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
269 {MONITOR_REQ_TERM, 0, mm_answer_term},
270 #ifdef SSH_AUDIT_EVENTS
271 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
272 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
273 #endif
274 {0, 0, NULL}
277 struct mon_table mon_dispatch_proto15[] = {
278 #ifdef WITH_SSH1
279 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
280 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
281 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
282 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
283 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
284 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
285 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
286 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
287 #ifdef BSD_AUTH
288 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
289 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
290 #endif
291 #ifdef SKEY
292 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
293 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
294 #endif
295 #ifdef USE_PAM
296 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
297 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
298 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
299 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
300 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
301 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
302 #endif
303 #ifdef SSH_AUDIT_EVENTS
304 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
305 #endif
306 #endif /* WITH_SSH1 */
307 {0, 0, NULL}
310 struct mon_table mon_dispatch_postauth15[] = {
311 #ifdef WITH_SSH1
312 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
313 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
314 {MONITOR_REQ_TERM, 0, mm_answer_term},
315 #ifdef SSH_AUDIT_EVENTS
316 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
317 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
318 #endif
319 #endif /* WITH_SSH1 */
320 {0, 0, NULL}
323 struct mon_table *mon_dispatch;
325 /* Specifies if a certain message is allowed at the moment */
327 static void
328 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
330 while (ent->f != NULL) {
331 if (ent->type == type) {
332 ent->flags &= ~MON_PERMIT;
333 ent->flags |= permit ? MON_PERMIT : 0;
334 return;
336 ent++;
340 static void
341 monitor_permit_authentications(int permit)
343 struct mon_table *ent = mon_dispatch;
345 while (ent->f != NULL) {
346 if (ent->flags & MON_AUTH) {
347 ent->flags &= ~MON_PERMIT;
348 ent->flags |= permit ? MON_PERMIT : 0;
350 ent++;
354 void
355 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
357 struct mon_table *ent;
358 int authenticated = 0, partial = 0;
360 debug3("preauth child monitor started");
362 close(pmonitor->m_recvfd);
363 close(pmonitor->m_log_sendfd);
364 pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
366 authctxt = _authctxt;
367 memset(authctxt, 0, sizeof(*authctxt));
369 authctxt->loginmsg = &loginmsg;
371 if (compat20) {
372 mon_dispatch = mon_dispatch_proto20;
374 /* Permit requests for moduli and signatures */
375 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
376 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
377 } else {
378 mon_dispatch = mon_dispatch_proto15;
380 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
383 /* The first few requests do not require asynchronous access */
384 while (!authenticated) {
385 partial = 0;
386 auth_method = "unknown";
387 auth_submethod = NULL;
388 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
390 /* Special handling for multiple required authentications */
391 if (options.num_auth_methods != 0) {
392 if (!compat20)
393 fatal("AuthenticationMethods is not supported"
394 "with SSH protocol 1");
395 if (authenticated &&
396 !auth2_update_methods_lists(authctxt,
397 auth_method, auth_submethod)) {
398 debug3("%s: method %s: partial", __func__,
399 auth_method);
400 authenticated = 0;
401 partial = 1;
405 if (authenticated) {
406 if (!(ent->flags & MON_AUTHDECIDE))
407 fatal("%s: unexpected authentication from %d",
408 __func__, ent->type);
409 if (authctxt->pw->pw_uid == 0 &&
410 !auth_root_allowed(auth_method))
411 authenticated = 0;
412 #ifdef USE_PAM
413 /* PAM needs to perform account checks after auth */
414 if (options.use_pam && authenticated) {
415 Buffer m;
417 buffer_init(&m);
418 mm_request_receive_expect(pmonitor->m_sendfd,
419 MONITOR_REQ_PAM_ACCOUNT, &m);
420 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
421 buffer_free(&m);
423 #endif
425 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
426 auth_log(authctxt, authenticated, partial,
427 auth_method, auth_submethod);
428 if (!authenticated)
429 authctxt->failures++;
433 if (!authctxt->valid)
434 fatal("%s: authenticated invalid user", __func__);
435 if (strcmp(auth_method, "unknown") == 0)
436 fatal("%s: authentication method name unknown", __func__);
438 debug("%s: %s has been authenticated by privileged process",
439 __func__, authctxt->user);
441 mm_get_keystate(pmonitor);
443 /* Drain any buffered messages from the child */
444 while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
447 close(pmonitor->m_sendfd);
448 close(pmonitor->m_log_recvfd);
449 pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
452 static void
453 monitor_set_child_handler(pid_t pid)
455 monitor_child_pid = pid;
458 static void
459 monitor_child_handler(int sig)
461 kill(monitor_child_pid, sig);
464 void
465 monitor_child_postauth(struct monitor *pmonitor)
467 close(pmonitor->m_recvfd);
468 pmonitor->m_recvfd = -1;
470 monitor_set_child_handler(pmonitor->m_pid);
471 signal(SIGHUP, &monitor_child_handler);
472 signal(SIGTERM, &monitor_child_handler);
473 signal(SIGINT, &monitor_child_handler);
474 #ifdef SIGXFSZ
475 signal(SIGXFSZ, SIG_IGN);
476 #endif
478 if (compat20) {
479 mon_dispatch = mon_dispatch_postauth20;
481 /* Permit requests for moduli and signatures */
482 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
483 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
484 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
485 } else {
486 mon_dispatch = mon_dispatch_postauth15;
487 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
489 if (!no_pty_flag) {
490 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
491 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
494 for (;;)
495 monitor_read(pmonitor, mon_dispatch, NULL);
498 void
499 monitor_sync(struct monitor *pmonitor)
501 if (options.compression) {
502 /* The member allocation is not visible, so sync it */
503 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
507 static int
508 monitor_read_log(struct monitor *pmonitor)
510 Buffer logmsg;
511 u_int len, level;
512 char *msg;
514 buffer_init(&logmsg);
516 /* Read length */
517 buffer_append_space(&logmsg, 4);
518 if (atomicio(read, pmonitor->m_log_recvfd,
519 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) {
520 if (errno == EPIPE) {
521 buffer_free(&logmsg);
522 debug("%s: child log fd closed", __func__);
523 close(pmonitor->m_log_recvfd);
524 pmonitor->m_log_recvfd = -1;
525 return -1;
527 fatal("%s: log fd read: %s", __func__, strerror(errno));
529 len = buffer_get_int(&logmsg);
530 if (len <= 4 || len > 8192)
531 fatal("%s: invalid log message length %u", __func__, len);
533 /* Read severity, message */
534 buffer_clear(&logmsg);
535 buffer_append_space(&logmsg, len);
536 if (atomicio(read, pmonitor->m_log_recvfd,
537 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg))
538 fatal("%s: log fd read: %s", __func__, strerror(errno));
540 /* Log it */
541 level = buffer_get_int(&logmsg);
542 msg = buffer_get_string(&logmsg, NULL);
543 if (log_level_name(level) == NULL)
544 fatal("%s: invalid log level %u (corrupted message?)",
545 __func__, level);
546 do_log2(level, "%s [preauth]", msg);
548 buffer_free(&logmsg);
549 free(msg);
551 return 0;
555 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
556 struct mon_table **pent)
558 Buffer m;
559 int ret;
560 u_char type;
561 struct pollfd pfd[2];
563 for (;;) {
564 memset(&pfd, 0, sizeof(pfd));
565 pfd[0].fd = pmonitor->m_sendfd;
566 pfd[0].events = POLLIN;
567 pfd[1].fd = pmonitor->m_log_recvfd;
568 pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
569 if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
570 if (errno == EINTR || errno == EAGAIN)
571 continue;
572 fatal("%s: poll: %s", __func__, strerror(errno));
574 if (pfd[1].revents) {
576 * Drain all log messages before processing next
577 * monitor request.
579 monitor_read_log(pmonitor);
580 continue;
582 if (pfd[0].revents)
583 break; /* Continues below */
586 buffer_init(&m);
588 mm_request_receive(pmonitor->m_sendfd, &m);
589 type = buffer_get_char(&m);
591 debug3("%s: checking request %d", __func__, type);
593 while (ent->f != NULL) {
594 if (ent->type == type)
595 break;
596 ent++;
599 if (ent->f != NULL) {
600 if (!(ent->flags & MON_PERMIT))
601 fatal("%s: unpermitted request %d", __func__,
602 type);
603 ret = (*ent->f)(pmonitor->m_sendfd, &m);
604 buffer_free(&m);
606 /* The child may use this request only once, disable it */
607 if (ent->flags & MON_ONCE) {
608 debug2("%s: %d used once, disabling now", __func__,
609 type);
610 ent->flags &= ~MON_PERMIT;
613 if (pent != NULL)
614 *pent = ent;
616 return ret;
619 fatal("%s: unsupported request: %d", __func__, type);
621 /* NOTREACHED */
622 return (-1);
625 /* allowed key state */
626 static int
627 monitor_allowed_key(u_char *blob, u_int bloblen)
629 /* make sure key is allowed */
630 if (key_blob == NULL || key_bloblen != bloblen ||
631 timingsafe_bcmp(key_blob, blob, key_bloblen))
632 return (0);
633 return (1);
636 static void
637 monitor_reset_key_state(void)
639 /* reset state */
640 free(key_blob);
641 free(hostbased_cuser);
642 free(hostbased_chost);
643 key_blob = NULL;
644 key_bloblen = 0;
645 key_blobtype = MM_NOKEY;
646 hostbased_cuser = NULL;
647 hostbased_chost = NULL;
650 #ifdef WITH_OPENSSL
652 mm_answer_moduli(int sock, Buffer *m)
654 DH *dh;
655 int min, want, max;
657 min = buffer_get_int(m);
658 want = buffer_get_int(m);
659 max = buffer_get_int(m);
661 debug3("%s: got parameters: %d %d %d",
662 __func__, min, want, max);
663 /* We need to check here, too, in case the child got corrupted */
664 if (max < min || want < min || max < want)
665 fatal("%s: bad parameters: %d %d %d",
666 __func__, min, want, max);
668 buffer_clear(m);
670 dh = choose_dh(min, want, max);
671 if (dh == NULL) {
672 buffer_put_char(m, 0);
673 return (0);
674 } else {
675 /* Send first bignum */
676 buffer_put_char(m, 1);
677 buffer_put_bignum2(m, dh->p);
678 buffer_put_bignum2(m, dh->g);
680 DH_free(dh);
682 mm_request_send(sock, MONITOR_ANS_MODULI, m);
683 return (0);
685 #endif
687 extern AuthenticationConnection *auth_conn;
690 mm_answer_sign(int sock, Buffer *m)
692 Key *key;
693 u_char *p;
694 u_char *signature;
695 u_int siglen, datlen;
696 int keyid;
698 debug3("%s", __func__);
700 keyid = buffer_get_int(m);
701 p = buffer_get_string(m, &datlen);
704 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
705 * SHA384 (48 bytes) and SHA512 (64 bytes).
707 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64)
708 fatal("%s: data length incorrect: %u", __func__, datlen);
710 /* save session id, it will be passed on the first call */
711 if (session_id2_len == 0) {
712 session_id2_len = datlen;
713 session_id2 = xmalloc(session_id2_len);
714 memcpy(session_id2, p, session_id2_len);
717 if ((key = get_hostkey_by_index(keyid)) != NULL) {
718 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
719 fatal("%s: key_sign failed", __func__);
720 } else if ((key = get_hostkey_public_by_index(keyid)) != NULL &&
721 auth_conn != NULL) {
722 if (ssh_agent_sign(auth_conn, key, &signature, &siglen, p,
723 datlen) < 0)
724 fatal("%s: ssh_agent_sign failed", __func__);
725 } else
726 fatal("%s: no hostkey from index %d", __func__, keyid);
728 debug3("%s: signature %p(%u)", __func__, signature, siglen);
730 buffer_clear(m);
731 buffer_put_string(m, signature, siglen);
733 free(p);
734 free(signature);
736 mm_request_send(sock, MONITOR_ANS_SIGN, m);
738 /* Turn on permissions for getpwnam */
739 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
741 return (0);
744 /* Retrieves the password entry and also checks if the user is permitted */
747 mm_answer_pwnamallow(int sock, Buffer *m)
749 char *username;
750 struct passwd *pwent;
751 int allowed = 0;
752 u_int i;
754 debug3("%s", __func__);
756 if (authctxt->attempt++ != 0)
757 fatal("%s: multiple attempts for getpwnam", __func__);
759 username = buffer_get_string(m, NULL);
761 pwent = getpwnamallow(username);
763 authctxt->user = xstrdup(username);
764 setproctitle("%s [priv]", pwent ? username : "unknown");
765 free(username);
767 buffer_clear(m);
769 if (pwent == NULL) {
770 buffer_put_char(m, 0);
771 authctxt->pw = fakepw();
772 goto out;
775 allowed = 1;
776 authctxt->pw = pwent;
777 authctxt->valid = 1;
779 buffer_put_char(m, 1);
780 buffer_put_string(m, pwent, sizeof(struct passwd));
781 buffer_put_cstring(m, pwent->pw_name);
782 buffer_put_cstring(m, "*");
783 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS
784 buffer_put_cstring(m, pwent->pw_gecos);
785 #endif
786 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS
787 buffer_put_cstring(m, pwent->pw_class);
788 #endif
789 buffer_put_cstring(m, pwent->pw_dir);
790 buffer_put_cstring(m, pwent->pw_shell);
792 out:
793 buffer_put_string(m, &options, sizeof(options));
795 #define M_CP_STROPT(x) do { \
796 if (options.x != NULL) \
797 buffer_put_cstring(m, options.x); \
798 } while (0)
799 #define M_CP_STRARRAYOPT(x, nx) do { \
800 for (i = 0; i < options.nx; i++) \
801 buffer_put_cstring(m, options.x[i]); \
802 } while (0)
803 /* See comment in servconf.h */
804 COPY_MATCH_STRING_OPTS();
805 #undef M_CP_STROPT
806 #undef M_CP_STRARRAYOPT
808 /* Create valid auth method lists */
809 if (compat20 && auth2_setup_methods_lists(authctxt) != 0) {
811 * The monitor will continue long enough to let the child
812 * run to it's packet_disconnect(), but it must not allow any
813 * authentication to succeed.
815 debug("%s: no valid authentication method lists", __func__);
818 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
819 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
821 /* For SSHv1 allow authentication now */
822 if (!compat20)
823 monitor_permit_authentications(1);
824 else {
825 /* Allow service/style information on the auth context */
826 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
827 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
829 #ifdef USE_PAM
830 if (options.use_pam)
831 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
832 #endif
834 return (0);
837 int mm_answer_auth2_read_banner(int sock, Buffer *m)
839 char *banner;
841 buffer_clear(m);
842 banner = auth2_read_banner();
843 buffer_put_cstring(m, banner != NULL ? banner : "");
844 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
845 free(banner);
847 return (0);
851 mm_answer_authserv(int sock, Buffer *m)
853 monitor_permit_authentications(1);
855 authctxt->service = buffer_get_string(m, NULL);
856 authctxt->style = buffer_get_string(m, NULL);
857 debug3("%s: service=%s, style=%s",
858 __func__, authctxt->service, authctxt->style);
860 if (strlen(authctxt->style) == 0) {
861 free(authctxt->style);
862 authctxt->style = NULL;
865 return (0);
869 mm_answer_authpassword(int sock, Buffer *m)
871 static int call_count;
872 char *passwd;
873 int authenticated;
874 u_int plen;
876 passwd = buffer_get_string(m, &plen);
877 /* Only authenticate if the context is valid */
878 authenticated = options.password_authentication &&
879 auth_password(authctxt, passwd);
880 explicit_bzero(passwd, strlen(passwd));
881 free(passwd);
883 buffer_clear(m);
884 buffer_put_int(m, authenticated);
886 debug3("%s: sending result %d", __func__, authenticated);
887 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
889 call_count++;
890 if (plen == 0 && call_count == 1)
891 auth_method = "none";
892 else
893 auth_method = "password";
895 /* Causes monitor loop to terminate if authenticated */
896 return (authenticated);
899 #ifdef BSD_AUTH
901 mm_answer_bsdauthquery(int sock, Buffer *m)
903 char *name, *infotxt;
904 u_int numprompts;
905 u_int *echo_on;
906 char **prompts;
907 u_int success;
909 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
910 &prompts, &echo_on) < 0 ? 0 : 1;
912 buffer_clear(m);
913 buffer_put_int(m, success);
914 if (success)
915 buffer_put_cstring(m, prompts[0]);
917 debug3("%s: sending challenge success: %u", __func__, success);
918 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
920 if (success) {
921 free(name);
922 free(infotxt);
923 free(prompts);
924 free(echo_on);
927 return (0);
931 mm_answer_bsdauthrespond(int sock, Buffer *m)
933 char *response;
934 int authok;
936 if (authctxt->as == 0)
937 fatal("%s: no bsd auth session", __func__);
939 response = buffer_get_string(m, NULL);
940 authok = options.challenge_response_authentication &&
941 auth_userresponse(authctxt->as, response, 0);
942 authctxt->as = NULL;
943 debug3("%s: <%s> = <%d>", __func__, response, authok);
944 free(response);
946 buffer_clear(m);
947 buffer_put_int(m, authok);
949 debug3("%s: sending authenticated: %d", __func__, authok);
950 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
952 if (compat20) {
953 auth_method = "keyboard-interactive";
954 auth_submethod = "bsdauth";
955 } else
956 auth_method = "bsdauth";
958 return (authok != 0);
960 #endif
962 #ifdef SKEY
964 mm_answer_skeyquery(int sock, Buffer *m)
966 struct skey skey;
967 char challenge[1024];
968 u_int success;
970 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
971 sizeof(challenge)) < 0 ? 0 : 1;
973 buffer_clear(m);
974 buffer_put_int(m, success);
975 if (success)
976 buffer_put_cstring(m, challenge);
978 debug3("%s: sending challenge success: %u", __func__, success);
979 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
981 return (0);
985 mm_answer_skeyrespond(int sock, Buffer *m)
987 char *response;
988 int authok;
990 response = buffer_get_string(m, NULL);
992 authok = (options.challenge_response_authentication &&
993 authctxt->valid &&
994 skey_haskey(authctxt->pw->pw_name) == 0 &&
995 skey_passcheck(authctxt->pw->pw_name, response) != -1);
997 free(response);
999 buffer_clear(m);
1000 buffer_put_int(m, authok);
1002 debug3("%s: sending authenticated: %d", __func__, authok);
1003 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
1005 auth_method = "skey";
1007 return (authok != 0);
1009 #endif
1011 #ifdef USE_PAM
1013 mm_answer_pam_start(int sock, Buffer *m)
1015 if (!options.use_pam)
1016 fatal("UsePAM not set, but ended up in %s anyway", __func__);
1018 start_pam(authctxt);
1020 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
1022 return (0);
1026 mm_answer_pam_account(int sock, Buffer *m)
1028 u_int ret;
1030 if (!options.use_pam)
1031 fatal("UsePAM not set, but ended up in %s anyway", __func__);
1033 ret = do_pam_account();
1035 buffer_put_int(m, ret);
1036 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1038 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
1040 return (ret);
1043 static void *sshpam_ctxt, *sshpam_authok;
1044 extern KbdintDevice sshpam_device;
1047 mm_answer_pam_init_ctx(int sock, Buffer *m)
1050 debug3("%s", __func__);
1051 authctxt->user = buffer_get_string(m, NULL);
1052 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
1053 sshpam_authok = NULL;
1054 buffer_clear(m);
1055 if (sshpam_ctxt != NULL) {
1056 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
1057 buffer_put_int(m, 1);
1058 } else {
1059 buffer_put_int(m, 0);
1061 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
1062 return (0);
1066 mm_answer_pam_query(int sock, Buffer *m)
1068 char *name = NULL, *info = NULL, **prompts = NULL;
1069 u_int i, num = 0, *echo_on = 0;
1070 int ret;
1072 debug3("%s", __func__);
1073 sshpam_authok = NULL;
1074 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
1075 if (ret == 0 && num == 0)
1076 sshpam_authok = sshpam_ctxt;
1077 if (num > 1 || name == NULL || info == NULL)
1078 ret = -1;
1079 buffer_clear(m);
1080 buffer_put_int(m, ret);
1081 buffer_put_cstring(m, name);
1082 free(name);
1083 buffer_put_cstring(m, info);
1084 free(info);
1085 buffer_put_int(m, num);
1086 for (i = 0; i < num; ++i) {
1087 buffer_put_cstring(m, prompts[i]);
1088 free(prompts[i]);
1089 buffer_put_int(m, echo_on[i]);
1091 free(prompts);
1092 free(echo_on);
1093 auth_method = "keyboard-interactive";
1094 auth_submethod = "pam";
1095 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
1096 return (0);
1100 mm_answer_pam_respond(int sock, Buffer *m)
1102 char **resp;
1103 u_int i, num;
1104 int ret;
1106 debug3("%s", __func__);
1107 sshpam_authok = NULL;
1108 num = buffer_get_int(m);
1109 if (num > 0) {
1110 resp = xcalloc(num, sizeof(char *));
1111 for (i = 0; i < num; ++i)
1112 resp[i] = buffer_get_string(m, NULL);
1113 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
1114 for (i = 0; i < num; ++i)
1115 free(resp[i]);
1116 free(resp);
1117 } else {
1118 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
1120 buffer_clear(m);
1121 buffer_put_int(m, ret);
1122 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
1123 auth_method = "keyboard-interactive";
1124 auth_submethod = "pam";
1125 if (ret == 0)
1126 sshpam_authok = sshpam_ctxt;
1127 return (0);
1131 mm_answer_pam_free_ctx(int sock, Buffer *m)
1134 debug3("%s", __func__);
1135 (sshpam_device.free_ctx)(sshpam_ctxt);
1136 buffer_clear(m);
1137 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
1138 auth_method = "keyboard-interactive";
1139 auth_submethod = "pam";
1140 return (sshpam_authok == sshpam_ctxt);
1142 #endif
1145 mm_answer_keyallowed(int sock, Buffer *m)
1147 Key *key;
1148 char *cuser, *chost;
1149 u_char *blob;
1150 u_int bloblen;
1151 enum mm_keytype type = 0;
1152 int allowed = 0;
1154 debug3("%s entering", __func__);
1156 type = buffer_get_int(m);
1157 cuser = buffer_get_string(m, NULL);
1158 chost = buffer_get_string(m, NULL);
1159 blob = buffer_get_string(m, &bloblen);
1161 key = key_from_blob(blob, bloblen);
1163 if ((compat20 && type == MM_RSAHOSTKEY) ||
1164 (!compat20 && type != MM_RSAHOSTKEY))
1165 fatal("%s: key type and protocol mismatch", __func__);
1167 debug3("%s: key_from_blob: %p", __func__, key);
1169 if (key != NULL && authctxt->valid) {
1170 switch (type) {
1171 case MM_USERKEY:
1172 allowed = options.pubkey_authentication &&
1173 user_key_allowed(authctxt->pw, key);
1174 pubkey_auth_info(authctxt, key, NULL);
1175 auth_method = "publickey";
1176 if (options.pubkey_authentication && allowed != 1)
1177 auth_clear_options();
1178 break;
1179 case MM_HOSTKEY:
1180 allowed = options.hostbased_authentication &&
1181 hostbased_key_allowed(authctxt->pw,
1182 cuser, chost, key);
1183 pubkey_auth_info(authctxt, key,
1184 "client user \"%.100s\", client host \"%.100s\"",
1185 cuser, chost);
1186 auth_method = "hostbased";
1187 break;
1188 #ifdef WITH_SSH1
1189 case MM_RSAHOSTKEY:
1190 key->type = KEY_RSA1; /* XXX */
1191 allowed = options.rhosts_rsa_authentication &&
1192 auth_rhosts_rsa_key_allowed(authctxt->pw,
1193 cuser, chost, key);
1194 if (options.rhosts_rsa_authentication && allowed != 1)
1195 auth_clear_options();
1196 auth_method = "rsa";
1197 break;
1198 #endif
1199 default:
1200 fatal("%s: unknown key type %d", __func__, type);
1201 break;
1204 if (key != NULL)
1205 key_free(key);
1207 /* clear temporarily storage (used by verify) */
1208 monitor_reset_key_state();
1210 if (allowed) {
1211 /* Save temporarily for comparison in verify */
1212 key_blob = blob;
1213 key_bloblen = bloblen;
1214 key_blobtype = type;
1215 hostbased_cuser = cuser;
1216 hostbased_chost = chost;
1217 } else {
1218 /* Log failed attempt */
1219 auth_log(authctxt, 0, 0, auth_method, NULL);
1220 free(blob);
1221 free(cuser);
1222 free(chost);
1225 debug3("%s: key %p is %s",
1226 __func__, key, allowed ? "allowed" : "not allowed");
1228 buffer_clear(m);
1229 buffer_put_int(m, allowed);
1230 buffer_put_int(m, forced_command != NULL);
1232 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1234 if (type == MM_RSAHOSTKEY)
1235 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1237 return (0);
1240 static int
1241 monitor_valid_userblob(u_char *data, u_int datalen)
1243 Buffer b;
1244 char *p, *userstyle;
1245 u_int len;
1246 int fail = 0;
1248 buffer_init(&b);
1249 buffer_append(&b, data, datalen);
1251 if (datafellows & SSH_OLD_SESSIONID) {
1252 p = buffer_ptr(&b);
1253 len = buffer_len(&b);
1254 if ((session_id2 == NULL) ||
1255 (len < session_id2_len) ||
1256 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1257 fail++;
1258 buffer_consume(&b, session_id2_len);
1259 } else {
1260 p = buffer_get_string(&b, &len);
1261 if ((session_id2 == NULL) ||
1262 (len != session_id2_len) ||
1263 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1264 fail++;
1265 free(p);
1267 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1268 fail++;
1269 p = buffer_get_cstring(&b, NULL);
1270 xasprintf(&userstyle, "%s%s%s", authctxt->user,
1271 authctxt->style ? ":" : "",
1272 authctxt->style ? authctxt->style : "");
1273 if (strcmp(userstyle, p) != 0) {
1274 logit("wrong user name passed to monitor: expected %s != %.100s",
1275 userstyle, p);
1276 fail++;
1278 free(userstyle);
1279 free(p);
1280 buffer_skip_string(&b);
1281 if (datafellows & SSH_BUG_PKAUTH) {
1282 if (!buffer_get_char(&b))
1283 fail++;
1284 } else {
1285 p = buffer_get_cstring(&b, NULL);
1286 if (strcmp("publickey", p) != 0)
1287 fail++;
1288 free(p);
1289 if (!buffer_get_char(&b))
1290 fail++;
1291 buffer_skip_string(&b);
1293 buffer_skip_string(&b);
1294 if (buffer_len(&b) != 0)
1295 fail++;
1296 buffer_free(&b);
1297 return (fail == 0);
1300 static int
1301 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1302 char *chost)
1304 Buffer b;
1305 char *p, *userstyle;
1306 u_int len;
1307 int fail = 0;
1309 buffer_init(&b);
1310 buffer_append(&b, data, datalen);
1312 p = buffer_get_string(&b, &len);
1313 if ((session_id2 == NULL) ||
1314 (len != session_id2_len) ||
1315 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1316 fail++;
1317 free(p);
1319 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1320 fail++;
1321 p = buffer_get_cstring(&b, NULL);
1322 xasprintf(&userstyle, "%s%s%s", authctxt->user,
1323 authctxt->style ? ":" : "",
1324 authctxt->style ? authctxt->style : "");
1325 if (strcmp(userstyle, p) != 0) {
1326 logit("wrong user name passed to monitor: expected %s != %.100s",
1327 userstyle, p);
1328 fail++;
1330 free(userstyle);
1331 free(p);
1332 buffer_skip_string(&b); /* service */
1333 p = buffer_get_cstring(&b, NULL);
1334 if (strcmp(p, "hostbased") != 0)
1335 fail++;
1336 free(p);
1337 buffer_skip_string(&b); /* pkalg */
1338 buffer_skip_string(&b); /* pkblob */
1340 /* verify client host, strip trailing dot if necessary */
1341 p = buffer_get_string(&b, NULL);
1342 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1343 p[len - 1] = '\0';
1344 if (strcmp(p, chost) != 0)
1345 fail++;
1346 free(p);
1348 /* verify client user */
1349 p = buffer_get_string(&b, NULL);
1350 if (strcmp(p, cuser) != 0)
1351 fail++;
1352 free(p);
1354 if (buffer_len(&b) != 0)
1355 fail++;
1356 buffer_free(&b);
1357 return (fail == 0);
1361 mm_answer_keyverify(int sock, Buffer *m)
1363 Key *key;
1364 u_char *signature, *data, *blob;
1365 u_int signaturelen, datalen, bloblen;
1366 int verified = 0;
1367 int valid_data = 0;
1369 blob = buffer_get_string(m, &bloblen);
1370 signature = buffer_get_string(m, &signaturelen);
1371 data = buffer_get_string(m, &datalen);
1373 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1374 !monitor_allowed_key(blob, bloblen))
1375 fatal("%s: bad key, not previously allowed", __func__);
1377 key = key_from_blob(blob, bloblen);
1378 if (key == NULL)
1379 fatal("%s: bad public key blob", __func__);
1381 switch (key_blobtype) {
1382 case MM_USERKEY:
1383 valid_data = monitor_valid_userblob(data, datalen);
1384 break;
1385 case MM_HOSTKEY:
1386 valid_data = monitor_valid_hostbasedblob(data, datalen,
1387 hostbased_cuser, hostbased_chost);
1388 break;
1389 default:
1390 valid_data = 0;
1391 break;
1393 if (!valid_data)
1394 fatal("%s: bad signature data blob", __func__);
1396 verified = key_verify(key, signature, signaturelen, data, datalen);
1397 debug3("%s: key %p signature %s",
1398 __func__, key, (verified == 1) ? "verified" : "unverified");
1400 key_free(key);
1401 free(blob);
1402 free(signature);
1403 free(data);
1405 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1407 monitor_reset_key_state();
1409 buffer_clear(m);
1410 buffer_put_int(m, verified);
1411 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1413 return (verified == 1);
1416 static void
1417 mm_record_login(Session *s, struct passwd *pw)
1419 socklen_t fromlen;
1420 struct sockaddr_storage from;
1423 * Get IP address of client. If the connection is not a socket, let
1424 * the address be 0.0.0.0.
1426 memset(&from, 0, sizeof(from));
1427 fromlen = sizeof(from);
1428 if (packet_connection_is_on_socket()) {
1429 if (getpeername(packet_get_connection_in(),
1430 (struct sockaddr *)&from, &fromlen) < 0) {
1431 debug("getpeername: %.100s", strerror(errno));
1432 cleanup_exit(255);
1435 /* Record that there was a login on that tty from the remote host. */
1436 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1437 get_remote_name_or_ip(utmp_len, options.use_dns),
1438 (struct sockaddr *)&from, fromlen);
1441 static void
1442 mm_session_close(Session *s)
1444 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1445 if (s->ttyfd != -1) {
1446 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1447 session_pty_cleanup2(s);
1449 session_unused(s->self);
1453 mm_answer_pty(int sock, Buffer *m)
1455 extern struct monitor *pmonitor;
1456 Session *s;
1457 int res, fd0;
1459 debug3("%s entering", __func__);
1461 buffer_clear(m);
1462 s = session_new();
1463 if (s == NULL)
1464 goto error;
1465 s->authctxt = authctxt;
1466 s->pw = authctxt->pw;
1467 s->pid = pmonitor->m_pid;
1468 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1469 if (res == 0)
1470 goto error;
1471 pty_setowner(authctxt->pw, s->tty);
1473 buffer_put_int(m, 1);
1474 buffer_put_cstring(m, s->tty);
1476 /* We need to trick ttyslot */
1477 if (dup2(s->ttyfd, 0) == -1)
1478 fatal("%s: dup2", __func__);
1480 mm_record_login(s, authctxt->pw);
1482 /* Now we can close the file descriptor again */
1483 close(0);
1485 /* send messages generated by record_login */
1486 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1487 buffer_clear(&loginmsg);
1489 mm_request_send(sock, MONITOR_ANS_PTY, m);
1491 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1492 mm_send_fd(sock, s->ttyfd) == -1)
1493 fatal("%s: send fds failed", __func__);
1495 /* make sure nothing uses fd 0 */
1496 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1497 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1498 if (fd0 != 0)
1499 error("%s: fd0 %d != 0", __func__, fd0);
1501 /* slave is not needed */
1502 close(s->ttyfd);
1503 s->ttyfd = s->ptyfd;
1504 /* no need to dup() because nobody closes ptyfd */
1505 s->ptymaster = s->ptyfd;
1507 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1509 return (0);
1511 error:
1512 if (s != NULL)
1513 mm_session_close(s);
1514 buffer_put_int(m, 0);
1515 mm_request_send(sock, MONITOR_ANS_PTY, m);
1516 return (0);
1520 mm_answer_pty_cleanup(int sock, Buffer *m)
1522 Session *s;
1523 char *tty;
1525 debug3("%s entering", __func__);
1527 tty = buffer_get_string(m, NULL);
1528 if ((s = session_by_tty(tty)) != NULL)
1529 mm_session_close(s);
1530 buffer_clear(m);
1531 free(tty);
1532 return (0);
1535 #ifdef WITH_SSH1
1537 mm_answer_sesskey(int sock, Buffer *m)
1539 BIGNUM *p;
1540 int rsafail;
1542 /* Turn off permissions */
1543 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1545 if ((p = BN_new()) == NULL)
1546 fatal("%s: BN_new", __func__);
1548 buffer_get_bignum2(m, p);
1550 rsafail = ssh1_session_key(p);
1552 buffer_clear(m);
1553 buffer_put_int(m, rsafail);
1554 buffer_put_bignum2(m, p);
1556 BN_clear_free(p);
1558 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1560 /* Turn on permissions for sessid passing */
1561 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1563 return (0);
1567 mm_answer_sessid(int sock, Buffer *m)
1569 int i;
1571 debug3("%s entering", __func__);
1573 if (buffer_len(m) != 16)
1574 fatal("%s: bad ssh1 session id", __func__);
1575 for (i = 0; i < 16; i++)
1576 session_id[i] = buffer_get_char(m);
1578 /* Turn on permissions for getpwnam */
1579 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1581 return (0);
1585 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1587 BIGNUM *client_n;
1588 Key *key = NULL;
1589 u_char *blob = NULL;
1590 u_int blen = 0;
1591 int allowed = 0;
1593 debug3("%s entering", __func__);
1595 auth_method = "rsa";
1596 if (options.rsa_authentication && authctxt->valid) {
1597 if ((client_n = BN_new()) == NULL)
1598 fatal("%s: BN_new", __func__);
1599 buffer_get_bignum2(m, client_n);
1600 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1601 BN_clear_free(client_n);
1603 buffer_clear(m);
1604 buffer_put_int(m, allowed);
1605 buffer_put_int(m, forced_command != NULL);
1607 /* clear temporarily storage (used by generate challenge) */
1608 monitor_reset_key_state();
1610 if (allowed && key != NULL) {
1611 key->type = KEY_RSA; /* cheat for key_to_blob */
1612 if (key_to_blob(key, &blob, &blen) == 0)
1613 fatal("%s: key_to_blob failed", __func__);
1614 buffer_put_string(m, blob, blen);
1616 /* Save temporarily for comparison in verify */
1617 key_blob = blob;
1618 key_bloblen = blen;
1619 key_blobtype = MM_RSAUSERKEY;
1621 if (key != NULL)
1622 key_free(key);
1624 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1626 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1627 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1628 return (0);
1632 mm_answer_rsa_challenge(int sock, Buffer *m)
1634 Key *key = NULL;
1635 u_char *blob;
1636 u_int blen;
1638 debug3("%s entering", __func__);
1640 if (!authctxt->valid)
1641 fatal("%s: authctxt not valid", __func__);
1642 blob = buffer_get_string(m, &blen);
1643 if (!monitor_allowed_key(blob, blen))
1644 fatal("%s: bad key, not previously allowed", __func__);
1645 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1646 fatal("%s: key type mismatch", __func__);
1647 if ((key = key_from_blob(blob, blen)) == NULL)
1648 fatal("%s: received bad key", __func__);
1649 if (key->type != KEY_RSA)
1650 fatal("%s: received bad key type %d", __func__, key->type);
1651 key->type = KEY_RSA1;
1652 if (ssh1_challenge)
1653 BN_clear_free(ssh1_challenge);
1654 ssh1_challenge = auth_rsa_generate_challenge(key);
1656 buffer_clear(m);
1657 buffer_put_bignum2(m, ssh1_challenge);
1659 debug3("%s sending reply", __func__);
1660 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1662 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1664 free(blob);
1665 key_free(key);
1666 return (0);
1670 mm_answer_rsa_response(int sock, Buffer *m)
1672 Key *key = NULL;
1673 u_char *blob, *response;
1674 u_int blen, len;
1675 int success;
1677 debug3("%s entering", __func__);
1679 if (!authctxt->valid)
1680 fatal("%s: authctxt not valid", __func__);
1681 if (ssh1_challenge == NULL)
1682 fatal("%s: no ssh1_challenge", __func__);
1684 blob = buffer_get_string(m, &blen);
1685 if (!monitor_allowed_key(blob, blen))
1686 fatal("%s: bad key, not previously allowed", __func__);
1687 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1688 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1689 if ((key = key_from_blob(blob, blen)) == NULL)
1690 fatal("%s: received bad key", __func__);
1691 response = buffer_get_string(m, &len);
1692 if (len != 16)
1693 fatal("%s: received bad response to challenge", __func__);
1694 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1696 free(blob);
1697 key_free(key);
1698 free(response);
1700 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1702 /* reset state */
1703 BN_clear_free(ssh1_challenge);
1704 ssh1_challenge = NULL;
1705 monitor_reset_key_state();
1707 buffer_clear(m);
1708 buffer_put_int(m, success);
1709 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1711 return (success);
1713 #endif
1716 mm_answer_term(int sock, Buffer *req)
1718 extern struct monitor *pmonitor;
1719 int res, status;
1721 debug3("%s: tearing down sessions", __func__);
1723 /* The child is terminating */
1724 session_destroy_all(&mm_session_close);
1726 #ifdef USE_PAM
1727 if (options.use_pam)
1728 sshpam_cleanup();
1729 #endif
1731 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1732 if (errno != EINTR)
1733 exit(1);
1735 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1737 /* Terminate process */
1738 exit(res);
1741 #ifdef SSH_AUDIT_EVENTS
1742 /* Report that an audit event occurred */
1744 mm_answer_audit_event(int socket, Buffer *m)
1746 ssh_audit_event_t event;
1748 debug3("%s entering", __func__);
1750 event = buffer_get_int(m);
1751 switch(event) {
1752 case SSH_AUTH_FAIL_PUBKEY:
1753 case SSH_AUTH_FAIL_HOSTBASED:
1754 case SSH_AUTH_FAIL_GSSAPI:
1755 case SSH_LOGIN_EXCEED_MAXTRIES:
1756 case SSH_LOGIN_ROOT_DENIED:
1757 case SSH_CONNECTION_CLOSE:
1758 case SSH_INVALID_USER:
1759 audit_event(event);
1760 break;
1761 default:
1762 fatal("Audit event type %d not permitted", event);
1765 return (0);
1769 mm_answer_audit_command(int socket, Buffer *m)
1771 u_int len;
1772 char *cmd;
1774 debug3("%s entering", __func__);
1775 cmd = buffer_get_string(m, &len);
1776 /* sanity check command, if so how? */
1777 audit_run_command(cmd);
1778 free(cmd);
1779 return (0);
1781 #endif /* SSH_AUDIT_EVENTS */
1783 void
1784 monitor_apply_keystate(struct monitor *pmonitor)
1786 if (compat20) {
1787 set_newkeys(MODE_IN);
1788 set_newkeys(MODE_OUT);
1789 } else {
1790 packet_set_protocol_flags(child_state.ssh1protoflags);
1791 packet_set_encryption_key(child_state.ssh1key,
1792 child_state.ssh1keylen, child_state.ssh1cipher);
1793 free(child_state.ssh1key);
1796 /* for rc4 and other stateful ciphers */
1797 packet_set_keycontext(MODE_OUT, child_state.keyout);
1798 free(child_state.keyout);
1799 packet_set_keycontext(MODE_IN, child_state.keyin);
1800 free(child_state.keyin);
1802 if (!compat20) {
1803 packet_set_iv(MODE_OUT, child_state.ivout);
1804 free(child_state.ivout);
1805 packet_set_iv(MODE_IN, child_state.ivin);
1806 free(child_state.ivin);
1809 memcpy(&incoming_stream, &child_state.incoming,
1810 sizeof(incoming_stream));
1811 memcpy(&outgoing_stream, &child_state.outgoing,
1812 sizeof(outgoing_stream));
1814 /* Update with new address */
1815 if (options.compression)
1816 mm_init_compression(pmonitor->m_zlib);
1818 packet_set_postauth();
1820 if (options.rekey_limit || options.rekey_interval)
1821 packet_set_rekey_limits((u_int32_t)options.rekey_limit,
1822 (time_t)options.rekey_interval);
1824 /* Network I/O buffers */
1825 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1826 buffer_clear(packet_get_input());
1827 buffer_append(packet_get_input(), child_state.input, child_state.ilen);
1828 explicit_bzero(child_state.input, child_state.ilen);
1829 free(child_state.input);
1831 buffer_clear(packet_get_output());
1832 buffer_append(packet_get_output(), child_state.output,
1833 child_state.olen);
1834 explicit_bzero(child_state.output, child_state.olen);
1835 free(child_state.output);
1837 /* Roaming */
1838 if (compat20)
1839 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
1842 static Kex *
1843 mm_get_kex(Buffer *m)
1845 Kex *kex;
1846 void *blob;
1847 u_int bloblen;
1849 kex = xcalloc(1, sizeof(*kex));
1850 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1851 if (session_id2 == NULL ||
1852 kex->session_id_len != session_id2_len ||
1853 timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0)
1854 fatal("mm_get_get: internal error: bad session id");
1855 kex->we_need = buffer_get_int(m);
1856 #ifdef WITH_OPENSSL
1857 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1858 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1859 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1860 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1861 kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1862 #endif
1863 kex->kex[KEX_C25519_SHA256] = kexc25519_server;
1864 kex->server = 1;
1865 kex->hostkey_type = buffer_get_int(m);
1866 kex->kex_type = buffer_get_int(m);
1867 blob = buffer_get_string(m, &bloblen);
1868 buffer_init(&kex->my);
1869 buffer_append(&kex->my, blob, bloblen);
1870 free(blob);
1871 blob = buffer_get_string(m, &bloblen);
1872 buffer_init(&kex->peer);
1873 buffer_append(&kex->peer, blob, bloblen);
1874 free(blob);
1875 kex->done = 1;
1876 kex->flags = buffer_get_int(m);
1877 kex->client_version_string = buffer_get_string(m, NULL);
1878 kex->server_version_string = buffer_get_string(m, NULL);
1879 kex->load_host_public_key=&get_hostkey_public_by_type;
1880 kex->load_host_private_key=&get_hostkey_private_by_type;
1881 kex->host_key_index=&get_hostkey_index;
1882 kex->sign = sshd_hostkey_sign;
1884 return (kex);
1887 /* This function requries careful sanity checking */
1889 void
1890 mm_get_keystate(struct monitor *pmonitor)
1892 Buffer m;
1893 u_char *blob, *p;
1894 u_int bloblen, plen;
1895 u_int32_t seqnr, packets;
1896 u_int64_t blocks, bytes;
1898 debug3("%s: Waiting for new keys", __func__);
1900 buffer_init(&m);
1901 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1902 if (!compat20) {
1903 child_state.ssh1protoflags = buffer_get_int(&m);
1904 child_state.ssh1cipher = buffer_get_int(&m);
1905 child_state.ssh1key = buffer_get_string(&m,
1906 &child_state.ssh1keylen);
1907 child_state.ivout = buffer_get_string(&m,
1908 &child_state.ivoutlen);
1909 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1910 goto skip;
1911 } else {
1912 /* Get the Kex for rekeying */
1913 *pmonitor->m_pkex = mm_get_kex(&m);
1916 blob = buffer_get_string(&m, &bloblen);
1917 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1918 free(blob);
1920 debug3("%s: Waiting for second key", __func__);
1921 blob = buffer_get_string(&m, &bloblen);
1922 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1923 free(blob);
1925 /* Now get sequence numbers for the packets */
1926 seqnr = buffer_get_int(&m);
1927 blocks = buffer_get_int64(&m);
1928 packets = buffer_get_int(&m);
1929 bytes = buffer_get_int64(&m);
1930 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1931 seqnr = buffer_get_int(&m);
1932 blocks = buffer_get_int64(&m);
1933 packets = buffer_get_int(&m);
1934 bytes = buffer_get_int64(&m);
1935 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1937 skip:
1938 /* Get the key context */
1939 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1940 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1942 debug3("%s: Getting compression state", __func__);
1943 /* Get compression state */
1944 p = buffer_get_string(&m, &plen);
1945 if (plen != sizeof(child_state.outgoing))
1946 fatal("%s: bad request size", __func__);
1947 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1948 free(p);
1950 p = buffer_get_string(&m, &plen);
1951 if (plen != sizeof(child_state.incoming))
1952 fatal("%s: bad request size", __func__);
1953 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1954 free(p);
1956 /* Network I/O buffers */
1957 debug3("%s: Getting Network I/O buffers", __func__);
1958 child_state.input = buffer_get_string(&m, &child_state.ilen);
1959 child_state.output = buffer_get_string(&m, &child_state.olen);
1961 /* Roaming */
1962 if (compat20) {
1963 child_state.sent_bytes = buffer_get_int64(&m);
1964 child_state.recv_bytes = buffer_get_int64(&m);
1967 buffer_free(&m);
1971 /* Allocation functions for zlib */
1972 void *
1973 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1975 size_t len = (size_t) size * ncount;
1976 void *address;
1978 if (len == 0 || ncount > SIZE_T_MAX / size)
1979 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1981 address = mm_malloc(mm, len);
1983 return (address);
1986 void
1987 mm_zfree(struct mm_master *mm, void *address)
1989 mm_free(mm, address);
1992 void
1993 mm_init_compression(struct mm_master *mm)
1995 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1996 outgoing_stream.zfree = (free_func)mm_zfree;
1997 outgoing_stream.opaque = mm;
1999 incoming_stream.zalloc = (alloc_func)mm_zalloc;
2000 incoming_stream.zfree = (free_func)mm_zfree;
2001 incoming_stream.opaque = mm;
2004 /* XXX */
2006 #define FD_CLOSEONEXEC(x) do { \
2007 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
2008 fatal("fcntl(%d, F_SETFD)", x); \
2009 } while (0)
2011 static void
2012 monitor_openfds(struct monitor *mon, int do_logfds)
2014 int pair[2];
2016 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
2017 fatal("%s: socketpair: %s", __func__, strerror(errno));
2018 FD_CLOSEONEXEC(pair[0]);
2019 FD_CLOSEONEXEC(pair[1]);
2020 mon->m_recvfd = pair[0];
2021 mon->m_sendfd = pair[1];
2023 if (do_logfds) {
2024 if (pipe(pair) == -1)
2025 fatal("%s: pipe: %s", __func__, strerror(errno));
2026 FD_CLOSEONEXEC(pair[0]);
2027 FD_CLOSEONEXEC(pair[1]);
2028 mon->m_log_recvfd = pair[0];
2029 mon->m_log_sendfd = pair[1];
2030 } else
2031 mon->m_log_recvfd = mon->m_log_sendfd = -1;
2034 #define MM_MEMSIZE 65536
2036 struct monitor *
2037 monitor_init(void)
2039 struct monitor *mon;
2041 mon = xcalloc(1, sizeof(*mon));
2043 monitor_openfds(mon, 1);
2045 /* Used to share zlib space across processes */
2046 if (options.compression) {
2047 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
2048 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
2050 /* Compression needs to share state across borders */
2051 mm_init_compression(mon->m_zlib);
2054 return mon;
2057 void
2058 monitor_reinit(struct monitor *mon)
2060 monitor_openfds(mon, 0);
2063 #ifdef GSSAPI
2065 mm_answer_gss_setup_ctx(int sock, Buffer *m)
2067 gss_OID_desc goid;
2068 OM_uint32 major;
2069 u_int len;
2071 goid.elements = buffer_get_string(m, &len);
2072 goid.length = len;
2074 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
2076 free(goid.elements);
2078 buffer_clear(m);
2079 buffer_put_int(m, major);
2081 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
2083 /* Now we have a context, enable the step */
2084 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
2086 return (0);
2090 mm_answer_gss_accept_ctx(int sock, Buffer *m)
2092 gss_buffer_desc in;
2093 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
2094 OM_uint32 major, minor;
2095 OM_uint32 flags = 0; /* GSI needs this */
2096 u_int len;
2098 in.value = buffer_get_string(m, &len);
2099 in.length = len;
2100 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
2101 free(in.value);
2103 buffer_clear(m);
2104 buffer_put_int(m, major);
2105 buffer_put_string(m, out.value, out.length);
2106 buffer_put_int(m, flags);
2107 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
2109 gss_release_buffer(&minor, &out);
2111 if (major == GSS_S_COMPLETE) {
2112 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
2113 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
2114 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
2116 return (0);
2120 mm_answer_gss_checkmic(int sock, Buffer *m)
2122 gss_buffer_desc gssbuf, mic;
2123 OM_uint32 ret;
2124 u_int len;
2126 gssbuf.value = buffer_get_string(m, &len);
2127 gssbuf.length = len;
2128 mic.value = buffer_get_string(m, &len);
2129 mic.length = len;
2131 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
2133 free(gssbuf.value);
2134 free(mic.value);
2136 buffer_clear(m);
2137 buffer_put_int(m, ret);
2139 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
2141 if (!GSS_ERROR(ret))
2142 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
2144 return (0);
2148 mm_answer_gss_userok(int sock, Buffer *m)
2150 int authenticated;
2152 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
2154 buffer_clear(m);
2155 buffer_put_int(m, authenticated);
2157 debug3("%s: sending result %d", __func__, authenticated);
2158 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
2160 auth_method = "gssapi-with-mic";
2162 /* Monitor loop will terminate if authenticated */
2163 return (authenticated);
2165 #endif /* GSSAPI */