1 /* $OpenBSD: monitor.c,v 1.180 2018/03/03 03:15:51 djm Exp $ */
3 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4 * Copyright 2002 Markus Friedl <markus@openbsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
30 #include <sys/types.h>
31 #include <sys/socket.h>
32 #include "openbsd-compat/sys-tree.h"
54 # ifdef HAVE_SYS_POLL_H
55 # include <sys/poll.h>
64 #include <openssl/dh.h>
67 #include "openbsd-compat/sys-queue.h"
79 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
82 #define TARGET_OS_MAC 1
87 #include "auth-options.h"
100 #include "monitor_wrap.h"
101 #include "monitor_fdpass.h"
109 static Gssctxt *gsscontext = NULL;
113 extern ServerOptions options;
114 extern u_int utmp_len;
115 extern u_char session_id[];
116 extern Buffer auth_debug;
117 extern int auth_debug_init;
118 extern Buffer loginmsg;
119 extern struct sshauthopt *auth_opts; /* XXX move to permanent ssh->authctxt? */
121 /* State exported from the child */
122 static struct sshbuf *child_state;
124 /* Functions on the monitor that answer unprivileged requests */
126 int mm_answer_moduli(int, Buffer *);
127 int mm_answer_sign(int, Buffer *);
128 int mm_answer_pwnamallow(int, Buffer *);
129 int mm_answer_auth2_read_banner(int, Buffer *);
130 int mm_answer_authserv(int, Buffer *);
131 int mm_answer_authpassword(int, Buffer *);
132 int mm_answer_bsdauthquery(int, Buffer *);
133 int mm_answer_bsdauthrespond(int, Buffer *);
134 int mm_answer_skeyquery(int, Buffer *);
135 int mm_answer_skeyrespond(int, Buffer *);
136 int mm_answer_keyallowed(int, Buffer *);
137 int mm_answer_keyverify(int, Buffer *);
138 int mm_answer_pty(int, Buffer *);
139 int mm_answer_pty_cleanup(int, Buffer *);
140 int mm_answer_term(int, Buffer *);
141 int mm_answer_rsa_keyallowed(int, Buffer *);
142 int mm_answer_rsa_challenge(int, Buffer *);
143 int mm_answer_rsa_response(int, Buffer *);
144 int mm_answer_sesskey(int, Buffer *);
145 int mm_answer_sessid(int, Buffer *);
148 int mm_answer_pam_start(int, Buffer *);
149 int mm_answer_pam_account(int, Buffer *);
150 int mm_answer_pam_init_ctx(int, Buffer *);
151 int mm_answer_pam_query(int, Buffer *);
152 int mm_answer_pam_respond(int, Buffer *);
153 int mm_answer_pam_free_ctx(int, Buffer *);
157 int mm_answer_gss_setup_ctx(int, Buffer *);
158 int mm_answer_gss_accept_ctx(int, Buffer *);
159 int mm_answer_gss_userok(int, Buffer *);
160 int mm_answer_gss_checkmic(int, Buffer *);
163 #ifdef SSH_AUDIT_EVENTS
164 int mm_answer_audit_event(int, Buffer *);
165 int mm_answer_audit_command(int, Buffer *);
168 static int monitor_read_log(struct monitor *);
170 static Authctxt *authctxt;
172 /* local state for key verify */
173 static u_char *key_blob = NULL;
174 static u_int key_bloblen = 0;
175 static int key_blobtype = MM_NOKEY;
176 static struct sshauthopt *key_opts = NULL;
177 static char *hostbased_cuser = NULL;
178 static char *hostbased_chost = NULL;
179 static char *auth_method = "unknown";
180 static char *auth_submethod = NULL;
181 static u_int session_id2_len = 0;
182 static u_char *session_id2 = NULL;
183 static pid_t monitor_child_pid;
186 enum monitor_reqtype type;
188 int (*f)(int, Buffer *);
191 #define MON_ISAUTH 0x0004 /* Required for Authentication */
192 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
193 #define MON_ONCE 0x0010 /* Disable after calling */
194 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
196 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
198 #define MON_PERMIT 0x1000 /* Request is permitted */
200 struct mon_table mon_dispatch_proto20[] = {
202 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
204 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
205 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
206 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
207 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
208 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
210 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
211 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
212 {MONITOR_REQ_PAM_INIT_CTX, MON_ONCE, mm_answer_pam_init_ctx},
213 {MONITOR_REQ_PAM_QUERY, 0, mm_answer_pam_query},
214 {MONITOR_REQ_PAM_RESPOND, MON_ONCE, mm_answer_pam_respond},
215 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
217 #ifdef SSH_AUDIT_EVENTS
218 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
221 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
222 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
225 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
226 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
228 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
229 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
231 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
232 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
233 {MONITOR_REQ_GSSUSEROK, MON_ONCE|MON_AUTHDECIDE, mm_answer_gss_userok},
234 {MONITOR_REQ_GSSCHECKMIC, MON_ONCE, mm_answer_gss_checkmic},
239 struct mon_table mon_dispatch_postauth20[] = {
241 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
243 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
244 {MONITOR_REQ_PTY, 0, mm_answer_pty},
245 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
246 {MONITOR_REQ_TERM, 0, mm_answer_term},
247 #ifdef SSH_AUDIT_EVENTS
248 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
249 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
254 struct mon_table *mon_dispatch;
256 /* Specifies if a certain message is allowed at the moment */
258 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
260 while (ent->f != NULL) {
261 if (ent->type == type) {
262 ent->flags &= ~MON_PERMIT;
263 ent->flags |= permit ? MON_PERMIT : 0;
271 monitor_permit_authentications(int permit)
273 struct mon_table *ent = mon_dispatch;
275 while (ent->f != NULL) {
276 if (ent->flags & MON_AUTH) {
277 ent->flags &= ~MON_PERMIT;
278 ent->flags |= permit ? MON_PERMIT : 0;
285 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
287 struct ssh *ssh = active_state; /* XXX */
288 struct mon_table *ent;
289 int authenticated = 0, partial = 0;
291 debug3("preauth child monitor started");
293 if (pmonitor->m_recvfd >= 0)
294 close(pmonitor->m_recvfd);
295 if (pmonitor->m_log_sendfd >= 0)
296 close(pmonitor->m_log_sendfd);
297 pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
299 authctxt = _authctxt;
300 memset(authctxt, 0, sizeof(*authctxt));
301 ssh->authctxt = authctxt;
303 authctxt->loginmsg = &loginmsg;
305 mon_dispatch = mon_dispatch_proto20;
306 /* Permit requests for moduli and signatures */
307 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
308 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
310 /* The first few requests do not require asynchronous access */
311 while (!authenticated) {
313 auth_method = "unknown";
314 auth_submethod = NULL;
315 auth2_authctxt_reset_info(authctxt);
317 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
319 /* Special handling for multiple required authentications */
320 if (options.num_auth_methods != 0) {
322 !auth2_update_methods_lists(authctxt,
323 auth_method, auth_submethod)) {
324 debug3("%s: method %s: partial", __func__,
332 if (!(ent->flags & MON_AUTHDECIDE))
333 fatal("%s: unexpected authentication from %d",
334 __func__, ent->type);
335 if (authctxt->pw->pw_uid == 0 &&
336 !auth_root_allowed(ssh, auth_method))
339 /* PAM needs to perform account checks after auth */
340 if (options.use_pam && authenticated) {
344 mm_request_receive_expect(pmonitor->m_sendfd,
345 MONITOR_REQ_PAM_ACCOUNT, &m);
346 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
351 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
352 auth_log(authctxt, authenticated, partial,
353 auth_method, auth_submethod);
354 if (!partial && !authenticated)
355 authctxt->failures++;
356 if (authenticated || partial) {
357 auth2_update_session_info(authctxt,
358 auth_method, auth_submethod);
363 if (!authctxt->valid)
364 fatal("%s: authenticated invalid user", __func__);
365 if (strcmp(auth_method, "unknown") == 0)
366 fatal("%s: authentication method name unknown", __func__);
368 debug("%s: %s has been authenticated by privileged process",
369 __func__, authctxt->user);
370 ssh->authctxt = NULL;
371 ssh_packet_set_log_preamble(ssh, "user %s", authctxt->user);
373 mm_get_keystate(pmonitor);
375 /* Drain any buffered messages from the child */
376 while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
379 if (pmonitor->m_recvfd >= 0)
380 close(pmonitor->m_recvfd);
381 if (pmonitor->m_log_sendfd >= 0)
382 close(pmonitor->m_log_sendfd);
383 pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
387 monitor_set_child_handler(pid_t pid)
389 monitor_child_pid = pid;
393 monitor_child_handler(int sig)
395 kill(monitor_child_pid, sig);
399 monitor_child_postauth(struct monitor *pmonitor)
401 close(pmonitor->m_recvfd);
402 pmonitor->m_recvfd = -1;
404 monitor_set_child_handler(pmonitor->m_pid);
405 signal(SIGHUP, &monitor_child_handler);
406 signal(SIGTERM, &monitor_child_handler);
407 signal(SIGINT, &monitor_child_handler);
409 signal(SIGXFSZ, SIG_IGN);
412 mon_dispatch = mon_dispatch_postauth20;
414 /* Permit requests for moduli and signatures */
415 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
416 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
417 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
419 if (auth_opts->permit_pty_flag) {
420 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
421 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
425 monitor_read(pmonitor, mon_dispatch, NULL);
429 monitor_read_log(struct monitor *pmonitor)
435 buffer_init(&logmsg);
438 buffer_append_space(&logmsg, 4);
439 if (atomicio(read, pmonitor->m_log_recvfd,
440 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) {
441 if (errno == EPIPE) {
442 buffer_free(&logmsg);
443 debug("%s: child log fd closed", __func__);
444 close(pmonitor->m_log_recvfd);
445 pmonitor->m_log_recvfd = -1;
448 fatal("%s: log fd read: %s", __func__, strerror(errno));
450 len = buffer_get_int(&logmsg);
451 if (len <= 4 || len > 8192)
452 fatal("%s: invalid log message length %u", __func__, len);
454 /* Read severity, message */
455 buffer_clear(&logmsg);
456 buffer_append_space(&logmsg, len);
457 if (atomicio(read, pmonitor->m_log_recvfd,
458 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg))
459 fatal("%s: log fd read: %s", __func__, strerror(errno));
462 level = buffer_get_int(&logmsg);
463 msg = buffer_get_string(&logmsg, NULL);
464 if (log_level_name(level) == NULL)
465 fatal("%s: invalid log level %u (corrupted message?)",
467 do_log2(level, "%s [preauth]", msg);
469 buffer_free(&logmsg);
476 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
477 struct mon_table **pent)
482 struct pollfd pfd[2];
485 memset(&pfd, 0, sizeof(pfd));
486 pfd[0].fd = pmonitor->m_sendfd;
487 pfd[0].events = POLLIN;
488 pfd[1].fd = pmonitor->m_log_recvfd;
489 pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
490 if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
491 if (errno == EINTR || errno == EAGAIN)
493 fatal("%s: poll: %s", __func__, strerror(errno));
495 if (pfd[1].revents) {
497 * Drain all log messages before processing next
500 monitor_read_log(pmonitor);
504 break; /* Continues below */
509 mm_request_receive(pmonitor->m_sendfd, &m);
510 type = buffer_get_char(&m);
512 debug3("%s: checking request %d", __func__, type);
514 while (ent->f != NULL) {
515 if (ent->type == type)
520 if (ent->f != NULL) {
521 if (!(ent->flags & MON_PERMIT))
522 fatal("%s: unpermitted request %d", __func__,
524 ret = (*ent->f)(pmonitor->m_sendfd, &m);
527 /* The child may use this request only once, disable it */
528 if (ent->flags & MON_ONCE) {
529 debug2("%s: %d used once, disabling now", __func__,
531 ent->flags &= ~MON_PERMIT;
540 fatal("%s: unsupported request: %d", __func__, type);
546 /* allowed key state */
548 monitor_allowed_key(u_char *blob, u_int bloblen)
550 /* make sure key is allowed */
551 if (key_blob == NULL || key_bloblen != bloblen ||
552 timingsafe_bcmp(key_blob, blob, key_bloblen))
558 monitor_reset_key_state(void)
562 free(hostbased_cuser);
563 free(hostbased_chost);
564 sshauthopt_free(key_opts);
567 key_blobtype = MM_NOKEY;
569 hostbased_cuser = NULL;
570 hostbased_chost = NULL;
575 mm_answer_moduli(int sock, Buffer *m)
580 min = buffer_get_int(m);
581 want = buffer_get_int(m);
582 max = buffer_get_int(m);
584 debug3("%s: got parameters: %d %d %d",
585 __func__, min, want, max);
586 /* We need to check here, too, in case the child got corrupted */
587 if (max < min || want < min || max < want)
588 fatal("%s: bad parameters: %d %d %d",
589 __func__, min, want, max);
593 dh = choose_dh(min, want, max);
595 buffer_put_char(m, 0);
599 DH_get0_pqg(dh, &p, NULL, &g);
600 /* Send first bignum */
601 buffer_put_char(m, 1);
602 buffer_put_bignum2(m, p);
603 buffer_put_bignum2(m, g);
607 mm_request_send(sock, MONITOR_ANS_MODULI, m);
613 mm_answer_sign(int sock, Buffer *m)
615 struct ssh *ssh = active_state; /* XXX */
616 extern int auth_sock; /* XXX move to state struct? */
618 struct sshbuf *sigbuf = NULL;
619 u_char *p = NULL, *signature = NULL;
621 size_t datlen, siglen, alglen;
624 const char proof_req[] = "hostkeys-prove-00@openssh.com";
626 debug3("%s", __func__);
628 if ((r = sshbuf_get_u32(m, &keyid)) != 0 ||
629 (r = sshbuf_get_string(m, &p, &datlen)) != 0 ||
630 (r = sshbuf_get_cstring(m, &alg, &alglen)) != 0)
631 fatal("%s: buffer error: %s", __func__, ssh_err(r));
633 fatal("%s: invalid key ID", __func__);
636 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
637 * SHA384 (48 bytes) and SHA512 (64 bytes).
639 * Otherwise, verify the signature request is for a hostkey
642 * XXX perform similar check for KEX signature requests too?
643 * it's not trivial, since what is signed is the hash, rather
644 * than the full kex structure...
646 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) {
648 * Construct expected hostkey proof and compare it to what
649 * the client sent us.
651 if (session_id2_len == 0) /* hostkeys is never first */
652 fatal("%s: bad data length: %zu", __func__, datlen);
653 if ((key = get_hostkey_public_by_index(keyid, ssh)) == NULL)
654 fatal("%s: no hostkey for index %d", __func__, keyid);
655 if ((sigbuf = sshbuf_new()) == NULL)
656 fatal("%s: sshbuf_new", __func__);
657 if ((r = sshbuf_put_cstring(sigbuf, proof_req)) != 0 ||
658 (r = sshbuf_put_string(sigbuf, session_id2,
659 session_id2_len)) != 0 ||
660 (r = sshkey_puts(key, sigbuf)) != 0)
661 fatal("%s: couldn't prepare private key "
662 "proof buffer: %s", __func__, ssh_err(r));
663 if (datlen != sshbuf_len(sigbuf) ||
664 memcmp(p, sshbuf_ptr(sigbuf), sshbuf_len(sigbuf)) != 0)
665 fatal("%s: bad data length: %zu, hostkey proof len %zu",
666 __func__, datlen, sshbuf_len(sigbuf));
671 /* save session id, it will be passed on the first call */
672 if (session_id2_len == 0) {
673 session_id2_len = datlen;
674 session_id2 = xmalloc(session_id2_len);
675 memcpy(session_id2, p, session_id2_len);
678 if ((key = get_hostkey_by_index(keyid)) != NULL) {
679 if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, alg,
681 fatal("%s: sshkey_sign failed: %s",
682 __func__, ssh_err(r));
683 } else if ((key = get_hostkey_public_by_index(keyid, ssh)) != NULL &&
685 if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
686 p, datlen, alg, datafellows)) != 0) {
687 fatal("%s: ssh_agent_sign failed: %s",
688 __func__, ssh_err(r));
691 fatal("%s: no hostkey from index %d", __func__, keyid);
693 debug3("%s: %s signature %p(%zu)", __func__,
694 is_proof ? "KEX" : "hostkey proof", signature, siglen);
697 if ((r = sshbuf_put_string(m, signature, siglen)) != 0)
698 fatal("%s: buffer error: %s", __func__, ssh_err(r));
704 mm_request_send(sock, MONITOR_ANS_SIGN, m);
706 /* Turn on permissions for getpwnam */
707 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
712 /* Retrieves the password entry and also checks if the user is permitted */
715 mm_answer_pwnamallow(int sock, Buffer *m)
717 struct ssh *ssh = active_state; /* XXX */
719 struct passwd *pwent;
723 debug3("%s", __func__);
725 if (authctxt->attempt++ != 0)
726 fatal("%s: multiple attempts for getpwnam", __func__);
728 username = buffer_get_string(m, NULL);
730 pwent = getpwnamallow(username);
732 authctxt->user = xstrdup(username);
733 setproctitle("%s [priv]", pwent ? username : "unknown");
739 buffer_put_char(m, 0);
740 authctxt->pw = fakepw();
745 authctxt->pw = pwent;
748 buffer_put_char(m, 1);
749 buffer_put_string(m, pwent, sizeof(struct passwd));
750 buffer_put_cstring(m, pwent->pw_name);
751 buffer_put_cstring(m, "*");
752 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS
753 buffer_put_cstring(m, pwent->pw_gecos);
755 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS
756 buffer_put_cstring(m, pwent->pw_class);
758 buffer_put_cstring(m, pwent->pw_dir);
759 buffer_put_cstring(m, pwent->pw_shell);
762 ssh_packet_set_log_preamble(ssh, "%suser %s",
763 authctxt->valid ? "authenticating" : "invalid ", authctxt->user);
764 buffer_put_string(m, &options, sizeof(options));
766 #define M_CP_STROPT(x) do { \
767 if (options.x != NULL) \
768 buffer_put_cstring(m, options.x); \
770 #define M_CP_STRARRAYOPT(x, nx) do { \
771 for (i = 0; i < options.nx; i++) \
772 buffer_put_cstring(m, options.x[i]); \
774 /* See comment in servconf.h */
775 COPY_MATCH_STRING_OPTS();
777 #undef M_CP_STRARRAYOPT
779 /* Create valid auth method lists */
780 if (auth2_setup_methods_lists(authctxt) != 0) {
782 * The monitor will continue long enough to let the child
783 * run to it's packet_disconnect(), but it must not allow any
784 * authentication to succeed.
786 debug("%s: no valid authentication method lists", __func__);
789 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
790 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
792 /* Allow service/style information on the auth context */
793 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
794 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
798 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
804 int mm_answer_auth2_read_banner(int sock, Buffer *m)
809 banner = auth2_read_banner();
810 buffer_put_cstring(m, banner != NULL ? banner : "");
811 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
818 mm_answer_authserv(int sock, Buffer *m)
820 monitor_permit_authentications(1);
822 authctxt->service = buffer_get_string(m, NULL);
823 authctxt->style = buffer_get_string(m, NULL);
824 debug3("%s: service=%s, style=%s",
825 __func__, authctxt->service, authctxt->style);
827 if (strlen(authctxt->style) == 0) {
828 free(authctxt->style);
829 authctxt->style = NULL;
836 mm_answer_authpassword(int sock, Buffer *m)
838 struct ssh *ssh = active_state; /* XXX */
839 static int call_count;
844 if (!options.password_authentication)
845 fatal("%s: password authentication not enabled", __func__);
846 passwd = buffer_get_string(m, &plen);
847 /* Only authenticate if the context is valid */
848 authenticated = options.password_authentication &&
849 auth_password(ssh, passwd);
850 explicit_bzero(passwd, strlen(passwd));
854 buffer_put_int(m, authenticated);
856 buffer_put_int(m, sshpam_get_maxtries_reached());
859 debug3("%s: sending result %d", __func__, authenticated);
860 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
863 if (plen == 0 && call_count == 1)
864 auth_method = "none";
866 auth_method = "password";
868 /* Causes monitor loop to terminate if authenticated */
869 return (authenticated);
874 mm_answer_bsdauthquery(int sock, Buffer *m)
876 char *name, *infotxt;
882 if (!options.kbd_interactive_authentication)
883 fatal("%s: kbd-int authentication not enabled", __func__);
884 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
885 &prompts, &echo_on) < 0 ? 0 : 1;
888 buffer_put_int(m, success);
890 buffer_put_cstring(m, prompts[0]);
892 debug3("%s: sending challenge success: %u", __func__, success);
893 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
906 mm_answer_bsdauthrespond(int sock, Buffer *m)
911 if (!options.kbd_interactive_authentication)
912 fatal("%s: kbd-int authentication not enabled", __func__);
913 if (authctxt->as == NULL)
914 fatal("%s: no bsd auth session", __func__);
916 response = buffer_get_string(m, NULL);
917 authok = options.challenge_response_authentication &&
918 auth_userresponse(authctxt->as, response, 0);
920 debug3("%s: <%s> = <%d>", __func__, response, authok);
924 buffer_put_int(m, authok);
926 debug3("%s: sending authenticated: %d", __func__, authok);
927 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
929 auth_method = "keyboard-interactive";
930 auth_submethod = "bsdauth";
932 return (authok != 0);
938 mm_answer_skeyquery(int sock, Buffer *m)
941 char challenge[1024];
944 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
945 sizeof(challenge)) < 0 ? 0 : 1;
948 buffer_put_int(m, success);
950 buffer_put_cstring(m, challenge);
952 debug3("%s: sending challenge success: %u", __func__, success);
953 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
959 mm_answer_skeyrespond(int sock, Buffer *m)
964 response = buffer_get_string(m, NULL);
966 authok = (options.challenge_response_authentication &&
968 skey_haskey(authctxt->pw->pw_name) == 0 &&
969 skey_passcheck(authctxt->pw->pw_name, response) != -1);
974 buffer_put_int(m, authok);
976 debug3("%s: sending authenticated: %d", __func__, authok);
977 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
979 auth_method = "keyboard-interactive";
980 auth_submethod = "skey";
982 return (authok != 0);
988 mm_answer_pam_start(int sock, Buffer *m)
990 if (!options.use_pam)
991 fatal("UsePAM not set, but ended up in %s anyway", __func__);
995 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
996 if (options.kbd_interactive_authentication)
997 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_INIT_CTX, 1);
1003 mm_answer_pam_account(int sock, Buffer *m)
1007 if (!options.use_pam)
1008 fatal("%s: PAM not enabled", __func__);
1010 ret = do_pam_account();
1012 buffer_put_int(m, ret);
1013 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1015 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
1020 static void *sshpam_ctxt, *sshpam_authok;
1021 extern KbdintDevice sshpam_device;
1024 mm_answer_pam_init_ctx(int sock, Buffer *m)
1026 debug3("%s", __func__);
1027 if (!options.kbd_interactive_authentication)
1028 fatal("%s: kbd-int authentication not enabled", __func__);
1029 if (sshpam_ctxt != NULL)
1030 fatal("%s: already called", __func__);
1031 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
1032 sshpam_authok = NULL;
1034 if (sshpam_ctxt != NULL) {
1035 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
1036 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_QUERY, 1);
1037 buffer_put_int(m, 1);
1039 buffer_put_int(m, 0);
1041 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
1046 mm_answer_pam_query(int sock, Buffer *m)
1048 char *name = NULL, *info = NULL, **prompts = NULL;
1049 u_int i, num = 0, *echo_on = 0;
1052 debug3("%s", __func__);
1053 sshpam_authok = NULL;
1054 if (sshpam_ctxt == NULL)
1055 fatal("%s: no context", __func__);
1056 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info,
1057 &num, &prompts, &echo_on);
1058 if (ret == 0 && num == 0)
1059 sshpam_authok = sshpam_ctxt;
1060 if (num > 1 || name == NULL || info == NULL)
1061 fatal("sshpam_device.query failed");
1062 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_RESPOND, 1);
1064 buffer_put_int(m, ret);
1065 buffer_put_cstring(m, name);
1067 buffer_put_cstring(m, info);
1069 buffer_put_int(m, sshpam_get_maxtries_reached());
1070 buffer_put_int(m, num);
1071 for (i = 0; i < num; ++i) {
1072 buffer_put_cstring(m, prompts[i]);
1074 buffer_put_int(m, echo_on[i]);
1078 auth_method = "keyboard-interactive";
1079 auth_submethod = "pam";
1080 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
1085 mm_answer_pam_respond(int sock, Buffer *m)
1091 debug3("%s", __func__);
1092 if (sshpam_ctxt == NULL)
1093 fatal("%s: no context", __func__);
1094 sshpam_authok = NULL;
1095 num = buffer_get_int(m);
1097 resp = xcalloc(num, sizeof(char *));
1098 for (i = 0; i < num; ++i)
1099 resp[i] = buffer_get_string(m, NULL);
1100 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
1101 for (i = 0; i < num; ++i)
1105 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
1108 buffer_put_int(m, ret);
1109 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
1110 auth_method = "keyboard-interactive";
1111 auth_submethod = "pam";
1113 sshpam_authok = sshpam_ctxt;
1118 mm_answer_pam_free_ctx(int sock, Buffer *m)
1120 int r = sshpam_authok != NULL && sshpam_authok == sshpam_ctxt;
1122 debug3("%s", __func__);
1123 if (sshpam_ctxt == NULL)
1124 fatal("%s: no context", __func__);
1125 (sshpam_device.free_ctx)(sshpam_ctxt);
1126 sshpam_ctxt = sshpam_authok = NULL;
1128 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
1129 /* Allow another attempt */
1130 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_INIT_CTX, 1);
1131 auth_method = "keyboard-interactive";
1132 auth_submethod = "pam";
1138 mm_answer_keyallowed(int sock, Buffer *m)
1140 struct ssh *ssh = active_state; /* XXX */
1142 char *cuser, *chost;
1144 u_int bloblen, pubkey_auth_attempt;
1145 enum mm_keytype type = 0;
1147 struct sshauthopt *opts = NULL;
1149 debug3("%s entering", __func__);
1150 type = buffer_get_int(m);
1151 cuser = buffer_get_string(m, NULL);
1152 chost = buffer_get_string(m, NULL);
1153 blob = buffer_get_string(m, &bloblen);
1154 pubkey_auth_attempt = buffer_get_int(m);
1156 key = key_from_blob(blob, bloblen);
1158 debug3("%s: key_from_blob: %p", __func__, key);
1160 if (key != NULL && authctxt->valid) {
1161 /* These should not make it past the privsep child */
1162 if (key_type_plain(key->type) == KEY_RSA &&
1163 (datafellows & SSH_BUG_RSASIGMD5) != 0)
1164 fatal("%s: passed a SSH_BUG_RSASIGMD5 key", __func__);
1168 auth_method = "publickey";
1169 if (!options.pubkey_authentication)
1171 if (auth2_key_already_used(authctxt, key))
1173 if (match_pattern_list(sshkey_ssh_name(key),
1174 options.pubkey_key_types, 0) != 1)
1176 allowed = user_key_allowed(ssh, authctxt->pw, key,
1177 pubkey_auth_attempt, &opts);
1180 auth_method = "hostbased";
1181 if (!options.hostbased_authentication)
1183 if (auth2_key_already_used(authctxt, key))
1185 if (match_pattern_list(sshkey_ssh_name(key),
1186 options.hostbased_key_types, 0) != 1)
1188 allowed = hostbased_key_allowed(authctxt->pw,
1190 auth2_record_info(authctxt,
1191 "client user \"%.100s\", client host \"%.100s\"",
1195 fatal("%s: unknown key type %d", __func__, type);
1200 debug3("%s: %s authentication%s: %s key is %s", __func__,
1201 auth_method, pubkey_auth_attempt ? "" : " test",
1202 (key == NULL || !authctxt->valid) ? "invalid" : sshkey_type(key),
1203 allowed ? "allowed" : "not allowed");
1205 auth2_record_key(authctxt, 0, key);
1208 /* clear temporarily storage (used by verify) */
1209 monitor_reset_key_state();
1212 /* Save temporarily for comparison in verify */
1214 key_bloblen = bloblen;
1215 key_blobtype = type;
1217 hostbased_cuser = cuser;
1218 hostbased_chost = chost;
1220 /* Log failed attempt */
1221 auth_log(authctxt, 0, 0, auth_method, NULL);
1228 buffer_put_int(m, allowed);
1229 if (opts != NULL && (r = sshauthopt_serialise(opts, m, 1)) != 0)
1230 fatal("%s: sshauthopt_serialise: %s", __func__, ssh_err(r));
1231 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1234 sshauthopt_free(opts);
1240 monitor_valid_userblob(u_char *data, u_int datalen)
1244 char *userstyle, *cp;
1249 buffer_append(&b, data, datalen);
1251 if (datafellows & SSH_OLD_SESSIONID) {
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))
1258 buffer_consume(&b, session_id2_len);
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))
1267 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1269 cp = 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, cp) != 0) {
1274 logit("wrong user name passed to monitor: "
1275 "expected %s != %.100s", userstyle, cp);
1280 buffer_skip_string(&b);
1281 cp = buffer_get_cstring(&b, NULL);
1282 if (strcmp("publickey", cp) != 0)
1285 if (!buffer_get_char(&b))
1287 buffer_skip_string(&b);
1288 buffer_skip_string(&b);
1289 if (buffer_len(&b) != 0)
1296 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1300 char *p, *userstyle;
1305 buffer_append(&b, data, datalen);
1307 p = buffer_get_string(&b, &len);
1308 if ((session_id2 == NULL) ||
1309 (len != session_id2_len) ||
1310 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1314 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1316 p = buffer_get_cstring(&b, NULL);
1317 xasprintf(&userstyle, "%s%s%s", authctxt->user,
1318 authctxt->style ? ":" : "",
1319 authctxt->style ? authctxt->style : "");
1320 if (strcmp(userstyle, p) != 0) {
1321 logit("wrong user name passed to monitor: expected %s != %.100s",
1327 buffer_skip_string(&b); /* service */
1328 p = buffer_get_cstring(&b, NULL);
1329 if (strcmp(p, "hostbased") != 0)
1332 buffer_skip_string(&b); /* pkalg */
1333 buffer_skip_string(&b); /* pkblob */
1335 /* verify client host, strip trailing dot if necessary */
1336 p = buffer_get_string(&b, NULL);
1337 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1339 if (strcmp(p, chost) != 0)
1343 /* verify client user */
1344 p = buffer_get_string(&b, NULL);
1345 if (strcmp(p, cuser) != 0)
1349 if (buffer_len(&b) != 0)
1356 mm_answer_keyverify(int sock, struct sshbuf *m)
1358 struct ssh *ssh = active_state; /* XXX */
1360 u_char *signature, *data, *blob;
1362 size_t signaturelen, datalen, bloblen;
1363 int r, ret, valid_data = 0, encoded_ret;
1365 if ((r = sshbuf_get_string(m, &blob, &bloblen)) != 0 ||
1366 (r = sshbuf_get_string(m, &signature, &signaturelen)) != 0 ||
1367 (r = sshbuf_get_string(m, &data, &datalen)) != 0 ||
1368 (r = sshbuf_get_cstring(m, &sigalg, NULL)) != 0)
1369 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1371 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1372 !monitor_allowed_key(blob, bloblen))
1373 fatal("%s: bad key, not previously allowed", __func__);
1375 /* Empty signature algorithm means NULL. */
1376 if (*sigalg == '\0') {
1381 /* XXX use sshkey_froms here; need to change key_blob, etc. */
1382 if ((r = sshkey_from_blob(blob, bloblen, &key)) != 0)
1383 fatal("%s: bad public key blob: %s", __func__, ssh_err(r));
1385 switch (key_blobtype) {
1387 valid_data = monitor_valid_userblob(data, datalen);
1388 auth_method = "publickey";
1391 valid_data = monitor_valid_hostbasedblob(data, datalen,
1392 hostbased_cuser, hostbased_chost);
1393 auth_method = "hostbased";
1400 fatal("%s: bad signature data blob", __func__);
1402 ret = sshkey_verify(key, signature, signaturelen, data, datalen,
1403 sigalg, active_state->compat);
1404 debug3("%s: %s %p signature %s", __func__, auth_method, key,
1405 (ret == 0) ? "verified" : "unverified");
1406 auth2_record_key(authctxt, ret == 0, key);
1413 if (key_blobtype == MM_USERKEY)
1414 auth_activate_options(ssh, key_opts);
1415 monitor_reset_key_state();
1420 /* encode ret != 0 as positive integer, since we're sending u32 */
1421 encoded_ret = (ret != 0);
1422 if ((r = sshbuf_put_u32(m, encoded_ret)) != 0)
1423 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1424 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1430 mm_record_login(Session *s, struct passwd *pw)
1432 struct ssh *ssh = active_state; /* XXX */
1434 struct sockaddr_storage from;
1437 * Get IP address of client. If the connection is not a socket, let
1438 * the address be 0.0.0.0.
1440 memset(&from, 0, sizeof(from));
1441 fromlen = sizeof(from);
1442 if (packet_connection_is_on_socket()) {
1443 if (getpeername(packet_get_connection_in(),
1444 (struct sockaddr *)&from, &fromlen) < 0) {
1445 debug("getpeername: %.100s", strerror(errno));
1449 /* Record that there was a login on that tty from the remote host. */
1450 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1451 session_get_remote_name_or_ip(ssh, utmp_len, options.use_dns),
1452 (struct sockaddr *)&from, fromlen);
1456 mm_session_close(Session *s)
1458 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1459 if (s->ttyfd != -1) {
1460 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1461 session_pty_cleanup2(s);
1463 session_unused(s->self);
1467 mm_answer_pty(int sock, Buffer *m)
1469 extern struct monitor *pmonitor;
1473 debug3("%s entering", __func__);
1479 s->authctxt = authctxt;
1480 s->pw = authctxt->pw;
1481 s->pid = pmonitor->m_pid;
1482 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1485 pty_setowner(authctxt->pw, s->tty);
1487 buffer_put_int(m, 1);
1488 buffer_put_cstring(m, s->tty);
1490 /* We need to trick ttyslot */
1491 if (dup2(s->ttyfd, 0) == -1)
1492 fatal("%s: dup2", __func__);
1494 mm_record_login(s, authctxt->pw);
1496 /* Now we can close the file descriptor again */
1499 /* send messages generated by record_login */
1500 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1501 buffer_clear(&loginmsg);
1503 mm_request_send(sock, MONITOR_ANS_PTY, m);
1505 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1506 mm_send_fd(sock, s->ttyfd) == -1)
1507 fatal("%s: send fds failed", __func__);
1509 /* make sure nothing uses fd 0 */
1510 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1511 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1513 error("%s: fd0 %d != 0", __func__, fd0);
1515 /* slave is not needed */
1517 s->ttyfd = s->ptyfd;
1518 /* no need to dup() because nobody closes ptyfd */
1519 s->ptymaster = s->ptyfd;
1521 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1527 mm_session_close(s);
1528 buffer_put_int(m, 0);
1529 mm_request_send(sock, MONITOR_ANS_PTY, m);
1534 mm_answer_pty_cleanup(int sock, Buffer *m)
1539 debug3("%s entering", __func__);
1541 tty = buffer_get_string(m, NULL);
1542 if ((s = session_by_tty(tty)) != NULL)
1543 mm_session_close(s);
1550 mm_answer_term(int sock, Buffer *req)
1552 struct ssh *ssh = active_state; /* XXX */
1553 extern struct monitor *pmonitor;
1556 debug3("%s: tearing down sessions", __func__);
1558 /* The child is terminating */
1559 session_destroy_all(ssh, &mm_session_close);
1562 if (options.use_pam)
1566 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1570 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1572 /* Terminate process */
1576 #ifdef SSH_AUDIT_EVENTS
1577 /* Report that an audit event occurred */
1579 mm_answer_audit_event(int socket, Buffer *m)
1581 ssh_audit_event_t event;
1583 debug3("%s entering", __func__);
1585 event = buffer_get_int(m);
1587 case SSH_AUTH_FAIL_PUBKEY:
1588 case SSH_AUTH_FAIL_HOSTBASED:
1589 case SSH_AUTH_FAIL_GSSAPI:
1590 case SSH_LOGIN_EXCEED_MAXTRIES:
1591 case SSH_LOGIN_ROOT_DENIED:
1592 case SSH_CONNECTION_CLOSE:
1593 case SSH_INVALID_USER:
1597 fatal("Audit event type %d not permitted", event);
1604 mm_answer_audit_command(int socket, Buffer *m)
1609 debug3("%s entering", __func__);
1610 cmd = buffer_get_string(m, &len);
1611 /* sanity check command, if so how? */
1612 audit_run_command(cmd);
1616 #endif /* SSH_AUDIT_EVENTS */
1619 monitor_clear_keystate(struct monitor *pmonitor)
1621 struct ssh *ssh = active_state; /* XXX */
1623 ssh_clear_newkeys(ssh, MODE_IN);
1624 ssh_clear_newkeys(ssh, MODE_OUT);
1625 sshbuf_free(child_state);
1630 monitor_apply_keystate(struct monitor *pmonitor)
1632 struct ssh *ssh = active_state; /* XXX */
1636 debug3("%s: packet_set_state", __func__);
1637 if ((r = ssh_packet_set_state(ssh, child_state)) != 0)
1638 fatal("%s: packet_set_state: %s", __func__, ssh_err(r));
1639 sshbuf_free(child_state);
1642 if ((kex = ssh->kex) != NULL) {
1643 /* XXX set callbacks */
1645 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1646 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1647 kex->kex[KEX_DH_GRP14_SHA256] = kexdh_server;
1648 kex->kex[KEX_DH_GRP16_SHA512] = kexdh_server;
1649 kex->kex[KEX_DH_GRP18_SHA512] = kexdh_server;
1650 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1651 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1652 # ifdef OPENSSL_HAS_ECC
1653 kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1655 #endif /* WITH_OPENSSL */
1656 kex->kex[KEX_C25519_SHA256] = kexc25519_server;
1657 kex->load_host_public_key=&get_hostkey_public_by_type;
1658 kex->load_host_private_key=&get_hostkey_private_by_type;
1659 kex->host_key_index=&get_hostkey_index;
1660 kex->sign = sshd_hostkey_sign;
1664 /* This function requries careful sanity checking */
1667 mm_get_keystate(struct monitor *pmonitor)
1669 debug3("%s: Waiting for new keys", __func__);
1671 if ((child_state = sshbuf_new()) == NULL)
1672 fatal("%s: sshbuf_new failed", __func__);
1673 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT,
1675 debug3("%s: GOT new keys", __func__);
1681 #define FD_CLOSEONEXEC(x) do { \
1682 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
1683 fatal("fcntl(%d, F_SETFD)", x); \
1687 monitor_openfds(struct monitor *mon, int do_logfds)
1694 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1695 fatal("%s: socketpair: %s", __func__, strerror(errno));
1697 if (setsockopt(pair[0], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1698 error("setsockopt SO_ZEROIZE(0): %.100s", strerror(errno));
1699 if (setsockopt(pair[1], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1700 error("setsockopt SO_ZEROIZE(1): %.100s", strerror(errno));
1702 FD_CLOSEONEXEC(pair[0]);
1703 FD_CLOSEONEXEC(pair[1]);
1704 mon->m_recvfd = pair[0];
1705 mon->m_sendfd = pair[1];
1708 if (pipe(pair) == -1)
1709 fatal("%s: pipe: %s", __func__, strerror(errno));
1710 FD_CLOSEONEXEC(pair[0]);
1711 FD_CLOSEONEXEC(pair[1]);
1712 mon->m_log_recvfd = pair[0];
1713 mon->m_log_sendfd = pair[1];
1715 mon->m_log_recvfd = mon->m_log_sendfd = -1;
1718 #define MM_MEMSIZE 65536
1723 struct monitor *mon;
1725 mon = xcalloc(1, sizeof(*mon));
1726 monitor_openfds(mon, 1);
1732 monitor_reinit(struct monitor *mon)
1734 monitor_openfds(mon, 0);
1739 mm_answer_gss_setup_ctx(int sock, Buffer *m)
1745 if (!options.gss_authentication)
1746 fatal("%s: GSSAPI authentication not enabled", __func__);
1748 goid.elements = buffer_get_string(m, &len);
1751 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1753 free(goid.elements);
1756 buffer_put_int(m, major);
1758 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1760 /* Now we have a context, enable the step */
1761 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1767 mm_answer_gss_accept_ctx(int sock, Buffer *m)
1770 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1771 OM_uint32 major, minor;
1772 OM_uint32 flags = 0; /* GSI needs this */
1775 if (!options.gss_authentication)
1776 fatal("%s: GSSAPI authentication not enabled", __func__);
1778 in.value = buffer_get_string(m, &len);
1780 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1784 buffer_put_int(m, major);
1785 buffer_put_string(m, out.value, out.length);
1786 buffer_put_int(m, flags);
1787 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1789 gss_release_buffer(&minor, &out);
1791 if (major == GSS_S_COMPLETE) {
1792 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1793 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1794 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1800 mm_answer_gss_checkmic(int sock, Buffer *m)
1802 gss_buffer_desc gssbuf, mic;
1806 if (!options.gss_authentication)
1807 fatal("%s: GSSAPI authentication not enabled", __func__);
1809 gssbuf.value = buffer_get_string(m, &len);
1810 gssbuf.length = len;
1811 mic.value = buffer_get_string(m, &len);
1814 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1820 buffer_put_int(m, ret);
1822 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1824 if (!GSS_ERROR(ret))
1825 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1831 mm_answer_gss_userok(int sock, Buffer *m)
1834 const char *displayname;
1836 if (!options.gss_authentication)
1837 fatal("%s: GSSAPI authentication not enabled", __func__);
1839 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1842 buffer_put_int(m, authenticated);
1844 debug3("%s: sending result %d", __func__, authenticated);
1845 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1847 auth_method = "gssapi-with-mic";
1849 if ((displayname = ssh_gssapi_displayname()) != NULL)
1850 auth2_record_info(authctxt, "%s", displayname);
1852 /* Monitor loop will terminate if authenticated */
1853 return (authenticated);