1 /* $OpenBSD: monitor.c,v 1.117 2012/06/22 12:30:26 dtucker 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/param.h>
32 #include <sys/socket.h>
33 #include "openbsd-compat/sys-tree.h"
50 # ifdef HAVE_SYS_POLL_H
51 # include <sys/poll.h>
59 #include <openssl/dh.h>
61 #include "openbsd-compat/sys-queue.h"
72 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
75 #define TARGET_OS_MAC 1
80 #include "auth-options.h"
89 #include "monitor_mm.h"
93 #include "monitor_wrap.h"
94 #include "monitor_fdpass.h"
102 static Gssctxt *gsscontext = NULL;
106 extern ServerOptions options;
107 extern u_int utmp_len;
108 extern Newkeys *current_keys[];
109 extern z_stream incoming_stream;
110 extern z_stream outgoing_stream;
111 extern u_char session_id[];
112 extern Buffer auth_debug;
113 extern int auth_debug_init;
114 extern Buffer loginmsg;
116 /* State exported from the child */
137 u_int64_t sent_bytes;
138 u_int64_t recv_bytes;
141 /* Functions on the monitor that answer unprivileged requests */
143 int mm_answer_moduli(int, Buffer *);
144 int mm_answer_sign(int, Buffer *);
145 int mm_answer_pwnamallow(int, Buffer *);
146 int mm_answer_auth2_read_banner(int, Buffer *);
147 int mm_answer_authserv(int, Buffer *);
148 int mm_answer_authpassword(int, Buffer *);
149 int mm_answer_bsdauthquery(int, Buffer *);
150 int mm_answer_bsdauthrespond(int, Buffer *);
151 int mm_answer_skeyquery(int, Buffer *);
152 int mm_answer_skeyrespond(int, Buffer *);
153 int mm_answer_keyallowed(int, Buffer *);
154 int mm_answer_keyverify(int, Buffer *);
155 int mm_answer_pty(int, Buffer *);
156 int mm_answer_pty_cleanup(int, Buffer *);
157 int mm_answer_term(int, Buffer *);
158 int mm_answer_rsa_keyallowed(int, Buffer *);
159 int mm_answer_rsa_challenge(int, Buffer *);
160 int mm_answer_rsa_response(int, Buffer *);
161 int mm_answer_sesskey(int, Buffer *);
162 int mm_answer_sessid(int, Buffer *);
163 int mm_answer_jpake_get_pwdata(int, Buffer *);
164 int mm_answer_jpake_step1(int, Buffer *);
165 int mm_answer_jpake_step2(int, Buffer *);
166 int mm_answer_jpake_key_confirm(int, Buffer *);
167 int mm_answer_jpake_check_confirm(int, Buffer *);
170 int mm_answer_pam_start(int, Buffer *);
171 int mm_answer_pam_account(int, Buffer *);
172 int mm_answer_pam_init_ctx(int, Buffer *);
173 int mm_answer_pam_query(int, Buffer *);
174 int mm_answer_pam_respond(int, Buffer *);
175 int mm_answer_pam_free_ctx(int, Buffer *);
179 int mm_answer_gss_setup_ctx(int, Buffer *);
180 int mm_answer_gss_accept_ctx(int, Buffer *);
181 int mm_answer_gss_userok(int, Buffer *);
182 int mm_answer_gss_checkmic(int, Buffer *);
185 #ifdef SSH_AUDIT_EVENTS
186 int mm_answer_audit_event(int, Buffer *);
187 int mm_answer_audit_command(int, Buffer *);
190 static int monitor_read_log(struct monitor *);
192 static Authctxt *authctxt;
193 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
195 /* local state for key verify */
196 static u_char *key_blob = NULL;
197 static u_int key_bloblen = 0;
198 static int key_blobtype = MM_NOKEY;
199 static char *hostbased_cuser = NULL;
200 static char *hostbased_chost = NULL;
201 static char *auth_method = "unknown";
202 static u_int session_id2_len = 0;
203 static u_char *session_id2 = NULL;
204 static pid_t monitor_child_pid;
207 enum monitor_reqtype type;
209 int (*f)(int, Buffer *);
212 #define MON_ISAUTH 0x0004 /* Required for Authentication */
213 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
214 #define MON_ONCE 0x0010 /* Disable after calling */
215 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
217 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
219 #define MON_PERMIT 0x1000 /* Request is permitted */
221 struct mon_table mon_dispatch_proto20[] = {
222 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
223 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
224 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
225 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
226 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
227 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
229 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
230 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
231 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
232 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
233 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
234 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
236 #ifdef SSH_AUDIT_EVENTS
237 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
240 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
241 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
244 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
245 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
247 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
248 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
250 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
251 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
252 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
253 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
256 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata},
257 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1},
258 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2},
259 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm},
260 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm},
265 struct mon_table mon_dispatch_postauth20[] = {
266 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
267 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
268 {MONITOR_REQ_PTY, 0, mm_answer_pty},
269 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
270 {MONITOR_REQ_TERM, 0, mm_answer_term},
271 #ifdef SSH_AUDIT_EVENTS
272 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
273 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
278 struct mon_table mon_dispatch_proto15[] = {
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},
288 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
289 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
292 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
293 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
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},
303 #ifdef SSH_AUDIT_EVENTS
304 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
309 struct mon_table mon_dispatch_postauth15[] = {
310 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
311 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
312 {MONITOR_REQ_TERM, 0, mm_answer_term},
313 #ifdef SSH_AUDIT_EVENTS
314 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
315 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
320 struct mon_table *mon_dispatch;
322 /* Specifies if a certain message is allowed at the moment */
325 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
327 while (ent->f != NULL) {
328 if (ent->type == type) {
329 ent->flags &= ~MON_PERMIT;
330 ent->flags |= permit ? MON_PERMIT : 0;
338 monitor_permit_authentications(int permit)
340 struct mon_table *ent = mon_dispatch;
342 while (ent->f != NULL) {
343 if (ent->flags & MON_AUTH) {
344 ent->flags &= ~MON_PERMIT;
345 ent->flags |= permit ? MON_PERMIT : 0;
352 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
354 struct mon_table *ent;
355 int authenticated = 0;
357 debug3("preauth child monitor started");
359 close(pmonitor->m_recvfd);
360 close(pmonitor->m_log_sendfd);
361 pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
363 authctxt = _authctxt;
364 memset(authctxt, 0, sizeof(*authctxt));
366 authctxt->loginmsg = &loginmsg;
369 mon_dispatch = mon_dispatch_proto20;
371 /* Permit requests for moduli and signatures */
372 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
373 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
375 mon_dispatch = mon_dispatch_proto15;
377 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
380 /* The first few requests do not require asynchronous access */
381 while (!authenticated) {
382 auth_method = "unknown";
383 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
385 if (!(ent->flags & MON_AUTHDECIDE))
386 fatal("%s: unexpected authentication from %d",
387 __func__, ent->type);
388 if (authctxt->pw->pw_uid == 0 &&
389 !auth_root_allowed(auth_method))
392 /* PAM needs to perform account checks after auth */
393 if (options.use_pam && authenticated) {
397 mm_request_receive_expect(pmonitor->m_sendfd,
398 MONITOR_REQ_PAM_ACCOUNT, &m);
399 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
405 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
406 auth_log(authctxt, authenticated, auth_method,
407 compat20 ? " ssh2" : "");
409 authctxt->failures++;
412 /* Cleanup JPAKE context after authentication */
413 if (ent->flags & MON_AUTHDECIDE) {
414 if (authctxt->jpake_ctx != NULL) {
415 jpake_free(authctxt->jpake_ctx);
416 authctxt->jpake_ctx = NULL;
422 /* Drain any buffered messages from the child */
423 while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
426 if (!authctxt->valid)
427 fatal("%s: authenticated invalid user", __func__);
428 if (strcmp(auth_method, "unknown") == 0)
429 fatal("%s: authentication method name unknown", __func__);
431 debug("%s: %s has been authenticated by privileged process",
432 __func__, authctxt->user);
434 mm_get_keystate(pmonitor);
436 close(pmonitor->m_sendfd);
437 close(pmonitor->m_log_recvfd);
438 pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
442 monitor_set_child_handler(pid_t pid)
444 monitor_child_pid = pid;
448 monitor_child_handler(int sig)
450 kill(monitor_child_pid, sig);
454 monitor_child_postauth(struct monitor *pmonitor)
456 close(pmonitor->m_recvfd);
457 pmonitor->m_recvfd = -1;
459 monitor_set_child_handler(pmonitor->m_pid);
460 signal(SIGHUP, &monitor_child_handler);
461 signal(SIGTERM, &monitor_child_handler);
462 signal(SIGINT, &monitor_child_handler);
465 mon_dispatch = mon_dispatch_postauth20;
467 /* Permit requests for moduli and signatures */
468 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
469 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
470 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
472 mon_dispatch = mon_dispatch_postauth15;
473 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
476 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
477 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
481 monitor_read(pmonitor, mon_dispatch, NULL);
485 monitor_sync(struct monitor *pmonitor)
487 if (options.compression) {
488 /* The member allocation is not visible, so sync it */
489 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
494 monitor_read_log(struct monitor *pmonitor)
500 buffer_init(&logmsg);
503 buffer_append_space(&logmsg, 4);
504 if (atomicio(read, pmonitor->m_log_recvfd,
505 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) {
506 if (errno == EPIPE) {
507 buffer_free(&logmsg);
508 debug("%s: child log fd closed", __func__);
509 close(pmonitor->m_log_recvfd);
510 pmonitor->m_log_recvfd = -1;
513 fatal("%s: log fd read: %s", __func__, strerror(errno));
515 len = buffer_get_int(&logmsg);
516 if (len <= 4 || len > 8192)
517 fatal("%s: invalid log message length %u", __func__, len);
519 /* Read severity, message */
520 buffer_clear(&logmsg);
521 buffer_append_space(&logmsg, len);
522 if (atomicio(read, pmonitor->m_log_recvfd,
523 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg))
524 fatal("%s: log fd read: %s", __func__, strerror(errno));
527 level = buffer_get_int(&logmsg);
528 msg = buffer_get_string(&logmsg, NULL);
529 if (log_level_name(level) == NULL)
530 fatal("%s: invalid log level %u (corrupted message?)",
532 do_log2(level, "%s [preauth]", msg);
534 buffer_free(&logmsg);
541 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
542 struct mon_table **pent)
547 struct pollfd pfd[2];
550 bzero(&pfd, sizeof(pfd));
551 pfd[0].fd = pmonitor->m_sendfd;
552 pfd[0].events = POLLIN;
553 pfd[1].fd = pmonitor->m_log_recvfd;
554 pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
555 if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
556 if (errno == EINTR || errno == EAGAIN)
558 fatal("%s: poll: %s", __func__, strerror(errno));
560 if (pfd[1].revents) {
562 * Drain all log messages before processing next
565 monitor_read_log(pmonitor);
569 break; /* Continues below */
574 mm_request_receive(pmonitor->m_sendfd, &m);
575 type = buffer_get_char(&m);
577 debug3("%s: checking request %d", __func__, type);
579 while (ent->f != NULL) {
580 if (ent->type == type)
585 if (ent->f != NULL) {
586 if (!(ent->flags & MON_PERMIT))
587 fatal("%s: unpermitted request %d", __func__,
589 ret = (*ent->f)(pmonitor->m_sendfd, &m);
592 /* The child may use this request only once, disable it */
593 if (ent->flags & MON_ONCE) {
594 debug2("%s: %d used once, disabling now", __func__,
596 ent->flags &= ~MON_PERMIT;
605 fatal("%s: unsupported request: %d", __func__, type);
611 /* allowed key state */
613 monitor_allowed_key(u_char *blob, u_int bloblen)
615 /* make sure key is allowed */
616 if (key_blob == NULL || key_bloblen != bloblen ||
617 timingsafe_bcmp(key_blob, blob, key_bloblen))
623 monitor_reset_key_state(void)
626 if (key_blob != NULL)
628 if (hostbased_cuser != NULL)
629 xfree(hostbased_cuser);
630 if (hostbased_chost != NULL)
631 xfree(hostbased_chost);
634 key_blobtype = MM_NOKEY;
635 hostbased_cuser = NULL;
636 hostbased_chost = NULL;
640 mm_answer_moduli(int sock, Buffer *m)
645 min = buffer_get_int(m);
646 want = buffer_get_int(m);
647 max = buffer_get_int(m);
649 debug3("%s: got parameters: %d %d %d",
650 __func__, min, want, max);
651 /* We need to check here, too, in case the child got corrupted */
652 if (max < min || want < min || max < want)
653 fatal("%s: bad parameters: %d %d %d",
654 __func__, min, want, max);
658 dh = choose_dh(min, want, max);
660 buffer_put_char(m, 0);
663 /* Send first bignum */
664 buffer_put_char(m, 1);
665 buffer_put_bignum2(m, dh->p);
666 buffer_put_bignum2(m, dh->g);
670 mm_request_send(sock, MONITOR_ANS_MODULI, m);
675 mm_answer_sign(int sock, Buffer *m)
680 u_int siglen, datlen;
683 debug3("%s", __func__);
685 keyid = buffer_get_int(m);
686 p = buffer_get_string(m, &datlen);
689 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
690 * SHA384 (48 bytes) and SHA512 (64 bytes).
692 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64)
693 fatal("%s: data length incorrect: %u", __func__, datlen);
695 /* save session id, it will be passed on the first call */
696 if (session_id2_len == 0) {
697 session_id2_len = datlen;
698 session_id2 = xmalloc(session_id2_len);
699 memcpy(session_id2, p, session_id2_len);
702 if ((key = get_hostkey_by_index(keyid)) == NULL)
703 fatal("%s: no hostkey from index %d", __func__, keyid);
704 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
705 fatal("%s: key_sign failed", __func__);
707 debug3("%s: signature %p(%u)", __func__, signature, siglen);
710 buffer_put_string(m, signature, siglen);
715 mm_request_send(sock, MONITOR_ANS_SIGN, m);
717 /* Turn on permissions for getpwnam */
718 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
723 /* Retrieves the password entry and also checks if the user is permitted */
726 mm_answer_pwnamallow(int sock, Buffer *m)
729 struct passwd *pwent;
733 debug3("%s", __func__);
735 if (authctxt->attempt++ != 0)
736 fatal("%s: multiple attempts for getpwnam", __func__);
738 username = buffer_get_string(m, NULL);
740 pwent = getpwnamallow(username);
742 authctxt->user = xstrdup(username);
743 setproctitle("%s [priv]", pwent ? username : "unknown");
749 buffer_put_char(m, 0);
750 authctxt->pw = fakepw();
755 authctxt->pw = pwent;
758 buffer_put_char(m, 1);
759 buffer_put_string(m, pwent, sizeof(struct passwd));
760 buffer_put_cstring(m, pwent->pw_name);
761 buffer_put_cstring(m, "*");
762 buffer_put_cstring(m, pwent->pw_gecos);
763 #ifdef HAVE_PW_CLASS_IN_PASSWD
764 buffer_put_cstring(m, pwent->pw_class);
766 buffer_put_cstring(m, pwent->pw_dir);
767 buffer_put_cstring(m, pwent->pw_shell);
770 buffer_put_string(m, &options, sizeof(options));
772 #define M_CP_STROPT(x) do { \
773 if (options.x != NULL) \
774 buffer_put_cstring(m, options.x); \
776 #define M_CP_STRARRAYOPT(x, nx) do { \
777 for (i = 0; i < options.nx; i++) \
778 buffer_put_cstring(m, options.x[i]); \
780 /* See comment in servconf.h */
781 COPY_MATCH_STRING_OPTS();
783 #undef M_CP_STRARRAYOPT
785 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
786 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
788 /* For SSHv1 allow authentication now */
790 monitor_permit_authentications(1);
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);
820 mm_answer_authserv(int sock, Buffer *m)
822 monitor_permit_authentications(1);
824 authctxt->service = buffer_get_string(m, NULL);
825 authctxt->style = buffer_get_string(m, NULL);
826 debug3("%s: service=%s, style=%s",
827 __func__, authctxt->service, authctxt->style);
829 if (strlen(authctxt->style) == 0) {
830 xfree(authctxt->style);
831 authctxt->style = NULL;
838 mm_answer_authpassword(int sock, Buffer *m)
840 static int call_count;
845 passwd = buffer_get_string(m, &plen);
846 /* Only authenticate if the context is valid */
847 authenticated = options.password_authentication &&
848 auth_password(authctxt, passwd);
849 memset(passwd, 0, strlen(passwd));
853 buffer_put_int(m, authenticated);
855 debug3("%s: sending result %d", __func__, authenticated);
856 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
859 if (plen == 0 && call_count == 1)
860 auth_method = "none";
862 auth_method = "password";
864 /* Causes monitor loop to terminate if authenticated */
865 return (authenticated);
870 mm_answer_bsdauthquery(int sock, Buffer *m)
872 char *name, *infotxt;
878 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
879 &prompts, &echo_on) < 0 ? 0 : 1;
882 buffer_put_int(m, success);
884 buffer_put_cstring(m, prompts[0]);
886 debug3("%s: sending challenge success: %u", __func__, success);
887 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
900 mm_answer_bsdauthrespond(int sock, Buffer *m)
905 if (authctxt->as == 0)
906 fatal("%s: no bsd auth session", __func__);
908 response = buffer_get_string(m, NULL);
909 authok = options.challenge_response_authentication &&
910 auth_userresponse(authctxt->as, response, 0);
912 debug3("%s: <%s> = <%d>", __func__, response, authok);
916 buffer_put_int(m, authok);
918 debug3("%s: sending authenticated: %d", __func__, authok);
919 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
921 auth_method = "bsdauth";
923 return (authok != 0);
929 mm_answer_skeyquery(int sock, Buffer *m)
932 char challenge[1024];
935 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
936 sizeof(challenge)) < 0 ? 0 : 1;
939 buffer_put_int(m, success);
941 buffer_put_cstring(m, challenge);
943 debug3("%s: sending challenge success: %u", __func__, success);
944 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
950 mm_answer_skeyrespond(int sock, Buffer *m)
955 response = buffer_get_string(m, NULL);
957 authok = (options.challenge_response_authentication &&
959 skey_haskey(authctxt->pw->pw_name) == 0 &&
960 skey_passcheck(authctxt->pw->pw_name, response) != -1);
965 buffer_put_int(m, authok);
967 debug3("%s: sending authenticated: %d", __func__, authok);
968 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
970 auth_method = "skey";
972 return (authok != 0);
978 mm_answer_pam_start(int sock, Buffer *m)
980 if (!options.use_pam)
981 fatal("UsePAM not set, but ended up in %s anyway", __func__);
985 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
991 mm_answer_pam_account(int sock, Buffer *m)
995 if (!options.use_pam)
996 fatal("UsePAM not set, but ended up in %s anyway", __func__);
998 ret = do_pam_account();
1000 buffer_put_int(m, ret);
1001 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1003 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
1008 static void *sshpam_ctxt, *sshpam_authok;
1009 extern KbdintDevice sshpam_device;
1012 mm_answer_pam_init_ctx(int sock, Buffer *m)
1015 debug3("%s", __func__);
1016 authctxt->user = buffer_get_string(m, NULL);
1017 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
1018 sshpam_authok = NULL;
1020 if (sshpam_ctxt != NULL) {
1021 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
1022 buffer_put_int(m, 1);
1024 buffer_put_int(m, 0);
1026 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
1031 mm_answer_pam_query(int sock, Buffer *m)
1033 char *name = NULL, *info = NULL, **prompts = NULL;
1034 u_int i, num = 0, *echo_on = 0;
1037 debug3("%s", __func__);
1038 sshpam_authok = NULL;
1039 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
1040 if (ret == 0 && num == 0)
1041 sshpam_authok = sshpam_ctxt;
1042 if (num > 1 || name == NULL || info == NULL)
1045 buffer_put_int(m, ret);
1046 buffer_put_cstring(m, name);
1048 buffer_put_cstring(m, info);
1050 buffer_put_int(m, num);
1051 for (i = 0; i < num; ++i) {
1052 buffer_put_cstring(m, prompts[i]);
1054 buffer_put_int(m, echo_on[i]);
1056 if (prompts != NULL)
1058 if (echo_on != NULL)
1060 auth_method = "keyboard-interactive/pam";
1061 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
1066 mm_answer_pam_respond(int sock, Buffer *m)
1072 debug3("%s", __func__);
1073 sshpam_authok = NULL;
1074 num = buffer_get_int(m);
1076 resp = xcalloc(num, sizeof(char *));
1077 for (i = 0; i < num; ++i)
1078 resp[i] = buffer_get_string(m, NULL);
1079 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
1080 for (i = 0; i < num; ++i)
1084 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
1087 buffer_put_int(m, ret);
1088 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
1089 auth_method = "keyboard-interactive/pam";
1091 sshpam_authok = sshpam_ctxt;
1096 mm_answer_pam_free_ctx(int sock, Buffer *m)
1099 debug3("%s", __func__);
1100 (sshpam_device.free_ctx)(sshpam_ctxt);
1102 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
1103 auth_method = "keyboard-interactive/pam";
1104 return (sshpam_authok == sshpam_ctxt);
1109 mm_answer_keyallowed(int sock, Buffer *m)
1112 char *cuser, *chost;
1115 enum mm_keytype type = 0;
1118 debug3("%s entering", __func__);
1120 type = buffer_get_int(m);
1121 cuser = buffer_get_string(m, NULL);
1122 chost = buffer_get_string(m, NULL);
1123 blob = buffer_get_string(m, &bloblen);
1125 key = key_from_blob(blob, bloblen);
1127 if ((compat20 && type == MM_RSAHOSTKEY) ||
1128 (!compat20 && type != MM_RSAHOSTKEY))
1129 fatal("%s: key type and protocol mismatch", __func__);
1131 debug3("%s: key_from_blob: %p", __func__, key);
1133 if (key != NULL && authctxt->valid) {
1136 allowed = options.pubkey_authentication &&
1137 user_key_allowed(authctxt->pw, key);
1138 auth_method = "publickey";
1139 if (options.pubkey_authentication && allowed != 1)
1140 auth_clear_options();
1143 allowed = options.hostbased_authentication &&
1144 hostbased_key_allowed(authctxt->pw,
1146 auth_method = "hostbased";
1149 key->type = KEY_RSA1; /* XXX */
1150 allowed = options.rhosts_rsa_authentication &&
1151 auth_rhosts_rsa_key_allowed(authctxt->pw,
1153 if (options.rhosts_rsa_authentication && allowed != 1)
1154 auth_clear_options();
1155 auth_method = "rsa";
1158 fatal("%s: unknown key type %d", __func__, type);
1165 /* clear temporarily storage (used by verify) */
1166 monitor_reset_key_state();
1169 /* Save temporarily for comparison in verify */
1171 key_bloblen = bloblen;
1172 key_blobtype = type;
1173 hostbased_cuser = cuser;
1174 hostbased_chost = chost;
1176 /* Log failed attempt */
1177 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
1183 debug3("%s: key %p is %s",
1184 __func__, key, allowed ? "allowed" : "not allowed");
1187 buffer_put_int(m, allowed);
1188 buffer_put_int(m, forced_command != NULL);
1190 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1192 if (type == MM_RSAHOSTKEY)
1193 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1199 monitor_valid_userblob(u_char *data, u_int datalen)
1207 buffer_append(&b, data, datalen);
1209 if (datafellows & SSH_OLD_SESSIONID) {
1211 len = buffer_len(&b);
1212 if ((session_id2 == NULL) ||
1213 (len < session_id2_len) ||
1214 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1216 buffer_consume(&b, session_id2_len);
1218 p = buffer_get_string(&b, &len);
1219 if ((session_id2 == NULL) ||
1220 (len != session_id2_len) ||
1221 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1225 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1227 p = buffer_get_string(&b, NULL);
1228 if (strcmp(authctxt->user, p) != 0) {
1229 logit("wrong user name passed to monitor: expected %s != %.100s",
1234 buffer_skip_string(&b);
1235 if (datafellows & SSH_BUG_PKAUTH) {
1236 if (!buffer_get_char(&b))
1239 p = buffer_get_string(&b, NULL);
1240 if (strcmp("publickey", p) != 0)
1243 if (!buffer_get_char(&b))
1245 buffer_skip_string(&b);
1247 buffer_skip_string(&b);
1248 if (buffer_len(&b) != 0)
1255 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1264 buffer_append(&b, data, datalen);
1266 p = buffer_get_string(&b, &len);
1267 if ((session_id2 == NULL) ||
1268 (len != session_id2_len) ||
1269 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1273 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1275 p = buffer_get_string(&b, NULL);
1276 if (strcmp(authctxt->user, p) != 0) {
1277 logit("wrong user name passed to monitor: expected %s != %.100s",
1282 buffer_skip_string(&b); /* service */
1283 p = buffer_get_string(&b, NULL);
1284 if (strcmp(p, "hostbased") != 0)
1287 buffer_skip_string(&b); /* pkalg */
1288 buffer_skip_string(&b); /* pkblob */
1290 /* verify client host, strip trailing dot if necessary */
1291 p = buffer_get_string(&b, NULL);
1292 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1294 if (strcmp(p, chost) != 0)
1298 /* verify client user */
1299 p = buffer_get_string(&b, NULL);
1300 if (strcmp(p, cuser) != 0)
1304 if (buffer_len(&b) != 0)
1311 mm_answer_keyverify(int sock, Buffer *m)
1314 u_char *signature, *data, *blob;
1315 u_int signaturelen, datalen, bloblen;
1319 blob = buffer_get_string(m, &bloblen);
1320 signature = buffer_get_string(m, &signaturelen);
1321 data = buffer_get_string(m, &datalen);
1323 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1324 !monitor_allowed_key(blob, bloblen))
1325 fatal("%s: bad key, not previously allowed", __func__);
1327 key = key_from_blob(blob, bloblen);
1329 fatal("%s: bad public key blob", __func__);
1331 switch (key_blobtype) {
1333 valid_data = monitor_valid_userblob(data, datalen);
1336 valid_data = monitor_valid_hostbasedblob(data, datalen,
1337 hostbased_cuser, hostbased_chost);
1344 fatal("%s: bad signature data blob", __func__);
1346 verified = key_verify(key, signature, signaturelen, data, datalen);
1347 debug3("%s: key %p signature %s",
1348 __func__, key, (verified == 1) ? "verified" : "unverified");
1355 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1357 monitor_reset_key_state();
1360 buffer_put_int(m, verified);
1361 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1363 return (verified == 1);
1367 mm_record_login(Session *s, struct passwd *pw)
1370 struct sockaddr_storage from;
1373 * Get IP address of client. If the connection is not a socket, let
1374 * the address be 0.0.0.0.
1376 memset(&from, 0, sizeof(from));
1377 fromlen = sizeof(from);
1378 if (packet_connection_is_on_socket()) {
1379 if (getpeername(packet_get_connection_in(),
1380 (struct sockaddr *)&from, &fromlen) < 0) {
1381 debug("getpeername: %.100s", strerror(errno));
1385 /* Record that there was a login on that tty from the remote host. */
1386 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1387 get_remote_name_or_ip(utmp_len, options.use_dns),
1388 (struct sockaddr *)&from, fromlen);
1392 mm_session_close(Session *s)
1394 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1395 if (s->ttyfd != -1) {
1396 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1397 session_pty_cleanup2(s);
1399 session_unused(s->self);
1403 mm_answer_pty(int sock, Buffer *m)
1405 extern struct monitor *pmonitor;
1409 debug3("%s entering", __func__);
1415 s->authctxt = authctxt;
1416 s->pw = authctxt->pw;
1417 s->pid = pmonitor->m_pid;
1418 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1421 pty_setowner(authctxt->pw, s->tty);
1423 buffer_put_int(m, 1);
1424 buffer_put_cstring(m, s->tty);
1426 /* We need to trick ttyslot */
1427 if (dup2(s->ttyfd, 0) == -1)
1428 fatal("%s: dup2", __func__);
1430 mm_record_login(s, authctxt->pw);
1432 /* Now we can close the file descriptor again */
1435 /* send messages generated by record_login */
1436 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1437 buffer_clear(&loginmsg);
1439 mm_request_send(sock, MONITOR_ANS_PTY, m);
1441 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1442 mm_send_fd(sock, s->ttyfd) == -1)
1443 fatal("%s: send fds failed", __func__);
1445 /* make sure nothing uses fd 0 */
1446 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1447 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1449 error("%s: fd0 %d != 0", __func__, fd0);
1451 /* slave is not needed */
1453 s->ttyfd = s->ptyfd;
1454 /* no need to dup() because nobody closes ptyfd */
1455 s->ptymaster = s->ptyfd;
1457 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1463 mm_session_close(s);
1464 buffer_put_int(m, 0);
1465 mm_request_send(sock, MONITOR_ANS_PTY, m);
1470 mm_answer_pty_cleanup(int sock, Buffer *m)
1475 debug3("%s entering", __func__);
1477 tty = buffer_get_string(m, NULL);
1478 if ((s = session_by_tty(tty)) != NULL)
1479 mm_session_close(s);
1486 mm_answer_sesskey(int sock, Buffer *m)
1491 /* Turn off permissions */
1492 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1494 if ((p = BN_new()) == NULL)
1495 fatal("%s: BN_new", __func__);
1497 buffer_get_bignum2(m, p);
1499 rsafail = ssh1_session_key(p);
1502 buffer_put_int(m, rsafail);
1503 buffer_put_bignum2(m, p);
1507 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1509 /* Turn on permissions for sessid passing */
1510 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1516 mm_answer_sessid(int sock, Buffer *m)
1520 debug3("%s entering", __func__);
1522 if (buffer_len(m) != 16)
1523 fatal("%s: bad ssh1 session id", __func__);
1524 for (i = 0; i < 16; i++)
1525 session_id[i] = buffer_get_char(m);
1527 /* Turn on permissions for getpwnam */
1528 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1534 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1538 u_char *blob = NULL;
1542 debug3("%s entering", __func__);
1544 auth_method = "rsa";
1545 if (options.rsa_authentication && authctxt->valid) {
1546 if ((client_n = BN_new()) == NULL)
1547 fatal("%s: BN_new", __func__);
1548 buffer_get_bignum2(m, client_n);
1549 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1550 BN_clear_free(client_n);
1553 buffer_put_int(m, allowed);
1554 buffer_put_int(m, forced_command != NULL);
1556 /* clear temporarily storage (used by generate challenge) */
1557 monitor_reset_key_state();
1559 if (allowed && key != NULL) {
1560 key->type = KEY_RSA; /* cheat for key_to_blob */
1561 if (key_to_blob(key, &blob, &blen) == 0)
1562 fatal("%s: key_to_blob failed", __func__);
1563 buffer_put_string(m, blob, blen);
1565 /* Save temporarily for comparison in verify */
1568 key_blobtype = MM_RSAUSERKEY;
1573 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1575 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1576 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1581 mm_answer_rsa_challenge(int sock, Buffer *m)
1587 debug3("%s entering", __func__);
1589 if (!authctxt->valid)
1590 fatal("%s: authctxt not valid", __func__);
1591 blob = buffer_get_string(m, &blen);
1592 if (!monitor_allowed_key(blob, blen))
1593 fatal("%s: bad key, not previously allowed", __func__);
1594 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1595 fatal("%s: key type mismatch", __func__);
1596 if ((key = key_from_blob(blob, blen)) == NULL)
1597 fatal("%s: received bad key", __func__);
1598 if (key->type != KEY_RSA)
1599 fatal("%s: received bad key type %d", __func__, key->type);
1600 key->type = KEY_RSA1;
1602 BN_clear_free(ssh1_challenge);
1603 ssh1_challenge = auth_rsa_generate_challenge(key);
1606 buffer_put_bignum2(m, ssh1_challenge);
1608 debug3("%s sending reply", __func__);
1609 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1611 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1619 mm_answer_rsa_response(int sock, Buffer *m)
1622 u_char *blob, *response;
1626 debug3("%s entering", __func__);
1628 if (!authctxt->valid)
1629 fatal("%s: authctxt not valid", __func__);
1630 if (ssh1_challenge == NULL)
1631 fatal("%s: no ssh1_challenge", __func__);
1633 blob = buffer_get_string(m, &blen);
1634 if (!monitor_allowed_key(blob, blen))
1635 fatal("%s: bad key, not previously allowed", __func__);
1636 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1637 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1638 if ((key = key_from_blob(blob, blen)) == NULL)
1639 fatal("%s: received bad key", __func__);
1640 response = buffer_get_string(m, &len);
1642 fatal("%s: received bad response to challenge", __func__);
1643 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1649 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1652 BN_clear_free(ssh1_challenge);
1653 ssh1_challenge = NULL;
1654 monitor_reset_key_state();
1657 buffer_put_int(m, success);
1658 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1664 mm_answer_term(int sock, Buffer *req)
1666 extern struct monitor *pmonitor;
1669 debug3("%s: tearing down sessions", __func__);
1671 /* The child is terminating */
1672 session_destroy_all(&mm_session_close);
1675 if (options.use_pam)
1679 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1683 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1685 /* Terminate process */
1689 #ifdef SSH_AUDIT_EVENTS
1690 /* Report that an audit event occurred */
1692 mm_answer_audit_event(int socket, Buffer *m)
1694 ssh_audit_event_t event;
1696 debug3("%s entering", __func__);
1698 event = buffer_get_int(m);
1700 case SSH_AUTH_FAIL_PUBKEY:
1701 case SSH_AUTH_FAIL_HOSTBASED:
1702 case SSH_AUTH_FAIL_GSSAPI:
1703 case SSH_LOGIN_EXCEED_MAXTRIES:
1704 case SSH_LOGIN_ROOT_DENIED:
1705 case SSH_CONNECTION_CLOSE:
1706 case SSH_INVALID_USER:
1710 fatal("Audit event type %d not permitted", event);
1717 mm_answer_audit_command(int socket, Buffer *m)
1722 debug3("%s entering", __func__);
1723 cmd = buffer_get_string(m, &len);
1724 /* sanity check command, if so how? */
1725 audit_run_command(cmd);
1729 #endif /* SSH_AUDIT_EVENTS */
1732 monitor_apply_keystate(struct monitor *pmonitor)
1735 set_newkeys(MODE_IN);
1736 set_newkeys(MODE_OUT);
1738 packet_set_protocol_flags(child_state.ssh1protoflags);
1739 packet_set_encryption_key(child_state.ssh1key,
1740 child_state.ssh1keylen, child_state.ssh1cipher);
1741 xfree(child_state.ssh1key);
1744 /* for rc4 and other stateful ciphers */
1745 packet_set_keycontext(MODE_OUT, child_state.keyout);
1746 xfree(child_state.keyout);
1747 packet_set_keycontext(MODE_IN, child_state.keyin);
1748 xfree(child_state.keyin);
1751 packet_set_iv(MODE_OUT, child_state.ivout);
1752 xfree(child_state.ivout);
1753 packet_set_iv(MODE_IN, child_state.ivin);
1754 xfree(child_state.ivin);
1757 memcpy(&incoming_stream, &child_state.incoming,
1758 sizeof(incoming_stream));
1759 memcpy(&outgoing_stream, &child_state.outgoing,
1760 sizeof(outgoing_stream));
1762 /* Update with new address */
1763 if (options.compression)
1764 mm_init_compression(pmonitor->m_zlib);
1766 /* Network I/O buffers */
1767 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1768 buffer_clear(packet_get_input());
1769 buffer_append(packet_get_input(), child_state.input, child_state.ilen);
1770 memset(child_state.input, 0, child_state.ilen);
1771 xfree(child_state.input);
1773 buffer_clear(packet_get_output());
1774 buffer_append(packet_get_output(), child_state.output,
1776 memset(child_state.output, 0, child_state.olen);
1777 xfree(child_state.output);
1781 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
1785 mm_get_kex(Buffer *m)
1791 kex = xcalloc(1, sizeof(*kex));
1792 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1793 if (session_id2 == NULL ||
1794 kex->session_id_len != session_id2_len ||
1795 timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0)
1796 fatal("mm_get_get: internal error: bad session id");
1797 kex->we_need = buffer_get_int(m);
1798 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1799 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1800 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1801 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1802 kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1804 kex->hostkey_type = buffer_get_int(m);
1805 kex->kex_type = buffer_get_int(m);
1806 blob = buffer_get_string(m, &bloblen);
1807 buffer_init(&kex->my);
1808 buffer_append(&kex->my, blob, bloblen);
1810 blob = buffer_get_string(m, &bloblen);
1811 buffer_init(&kex->peer);
1812 buffer_append(&kex->peer, blob, bloblen);
1815 kex->flags = buffer_get_int(m);
1816 kex->client_version_string = buffer_get_string(m, NULL);
1817 kex->server_version_string = buffer_get_string(m, NULL);
1818 kex->load_host_public_key=&get_hostkey_public_by_type;
1819 kex->load_host_private_key=&get_hostkey_private_by_type;
1820 kex->host_key_index=&get_hostkey_index;
1825 /* This function requries careful sanity checking */
1828 mm_get_keystate(struct monitor *pmonitor)
1832 u_int bloblen, plen;
1833 u_int32_t seqnr, packets;
1834 u_int64_t blocks, bytes;
1836 debug3("%s: Waiting for new keys", __func__);
1839 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1841 child_state.ssh1protoflags = buffer_get_int(&m);
1842 child_state.ssh1cipher = buffer_get_int(&m);
1843 child_state.ssh1key = buffer_get_string(&m,
1844 &child_state.ssh1keylen);
1845 child_state.ivout = buffer_get_string(&m,
1846 &child_state.ivoutlen);
1847 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1850 /* Get the Kex for rekeying */
1851 *pmonitor->m_pkex = mm_get_kex(&m);
1854 blob = buffer_get_string(&m, &bloblen);
1855 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1858 debug3("%s: Waiting for second key", __func__);
1859 blob = buffer_get_string(&m, &bloblen);
1860 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1863 /* Now get sequence numbers for the packets */
1864 seqnr = buffer_get_int(&m);
1865 blocks = buffer_get_int64(&m);
1866 packets = buffer_get_int(&m);
1867 bytes = buffer_get_int64(&m);
1868 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1869 seqnr = buffer_get_int(&m);
1870 blocks = buffer_get_int64(&m);
1871 packets = buffer_get_int(&m);
1872 bytes = buffer_get_int64(&m);
1873 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1876 /* Get the key context */
1877 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1878 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1880 debug3("%s: Getting compression state", __func__);
1881 /* Get compression state */
1882 p = buffer_get_string(&m, &plen);
1883 if (plen != sizeof(child_state.outgoing))
1884 fatal("%s: bad request size", __func__);
1885 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1888 p = buffer_get_string(&m, &plen);
1889 if (plen != sizeof(child_state.incoming))
1890 fatal("%s: bad request size", __func__);
1891 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1894 /* Network I/O buffers */
1895 debug3("%s: Getting Network I/O buffers", __func__);
1896 child_state.input = buffer_get_string(&m, &child_state.ilen);
1897 child_state.output = buffer_get_string(&m, &child_state.olen);
1901 child_state.sent_bytes = buffer_get_int64(&m);
1902 child_state.recv_bytes = buffer_get_int64(&m);
1909 /* Allocation functions for zlib */
1911 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1913 size_t len = (size_t) size * ncount;
1916 if (len == 0 || ncount > SIZE_T_MAX / size)
1917 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1919 address = mm_malloc(mm, len);
1925 mm_zfree(struct mm_master *mm, void *address)
1927 mm_free(mm, address);
1931 mm_init_compression(struct mm_master *mm)
1933 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1934 outgoing_stream.zfree = (free_func)mm_zfree;
1935 outgoing_stream.opaque = mm;
1937 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1938 incoming_stream.zfree = (free_func)mm_zfree;
1939 incoming_stream.opaque = mm;
1944 #define FD_CLOSEONEXEC(x) do { \
1945 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
1946 fatal("fcntl(%d, F_SETFD)", x); \
1950 monitor_openfds(struct monitor *mon, int do_logfds)
1954 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1955 fatal("%s: socketpair: %s", __func__, strerror(errno));
1956 FD_CLOSEONEXEC(pair[0]);
1957 FD_CLOSEONEXEC(pair[1]);
1958 mon->m_recvfd = pair[0];
1959 mon->m_sendfd = pair[1];
1962 if (pipe(pair) == -1)
1963 fatal("%s: pipe: %s", __func__, strerror(errno));
1964 FD_CLOSEONEXEC(pair[0]);
1965 FD_CLOSEONEXEC(pair[1]);
1966 mon->m_log_recvfd = pair[0];
1967 mon->m_log_sendfd = pair[1];
1969 mon->m_log_recvfd = mon->m_log_sendfd = -1;
1972 #define MM_MEMSIZE 65536
1977 struct monitor *mon;
1979 mon = xcalloc(1, sizeof(*mon));
1981 monitor_openfds(mon, 1);
1983 /* Used to share zlib space across processes */
1984 if (options.compression) {
1985 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1986 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1988 /* Compression needs to share state across borders */
1989 mm_init_compression(mon->m_zlib);
1996 monitor_reinit(struct monitor *mon)
1998 monitor_openfds(mon, 0);
2003 mm_answer_gss_setup_ctx(int sock, Buffer *m)
2009 goid.elements = buffer_get_string(m, &len);
2012 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
2014 xfree(goid.elements);
2017 buffer_put_int(m, major);
2019 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
2021 /* Now we have a context, enable the step */
2022 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
2028 mm_answer_gss_accept_ctx(int sock, Buffer *m)
2031 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
2032 OM_uint32 major, minor;
2033 OM_uint32 flags = 0; /* GSI needs this */
2036 in.value = buffer_get_string(m, &len);
2038 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
2042 buffer_put_int(m, major);
2043 buffer_put_string(m, out.value, out.length);
2044 buffer_put_int(m, flags);
2045 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
2047 gss_release_buffer(&minor, &out);
2049 if (major == GSS_S_COMPLETE) {
2050 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
2051 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
2052 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
2058 mm_answer_gss_checkmic(int sock, Buffer *m)
2060 gss_buffer_desc gssbuf, mic;
2064 gssbuf.value = buffer_get_string(m, &len);
2065 gssbuf.length = len;
2066 mic.value = buffer_get_string(m, &len);
2069 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
2071 xfree(gssbuf.value);
2075 buffer_put_int(m, ret);
2077 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
2079 if (!GSS_ERROR(ret))
2080 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
2086 mm_answer_gss_userok(int sock, Buffer *m)
2090 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
2093 buffer_put_int(m, authenticated);
2095 debug3("%s: sending result %d", __func__, authenticated);
2096 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
2098 auth_method = "gssapi-with-mic";
2100 /* Monitor loop will terminate if authenticated */
2101 return (authenticated);
2107 mm_answer_jpake_step1(int sock, Buffer *m)
2109 struct jpake_ctx *pctx;
2110 u_char *x3_proof, *x4_proof;
2111 u_int x3_proof_len, x4_proof_len;
2113 if (!options.zero_knowledge_password_authentication)
2114 fatal("zero_knowledge_password_authentication disabled");
2116 if (authctxt->jpake_ctx != NULL)
2117 fatal("%s: authctxt->jpake_ctx already set (%p)",
2118 __func__, authctxt->jpake_ctx);
2119 authctxt->jpake_ctx = pctx = jpake_new();
2121 jpake_step1(pctx->grp,
2122 &pctx->server_id, &pctx->server_id_len,
2123 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4,
2124 &x3_proof, &x3_proof_len,
2125 &x4_proof, &x4_proof_len);
2127 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__));
2131 buffer_put_string(m, pctx->server_id, pctx->server_id_len);
2132 buffer_put_bignum2(m, pctx->g_x3);
2133 buffer_put_bignum2(m, pctx->g_x4);
2134 buffer_put_string(m, x3_proof, x3_proof_len);
2135 buffer_put_string(m, x4_proof, x4_proof_len);
2137 debug3("%s: sending step1", __func__);
2138 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m);
2140 bzero(x3_proof, x3_proof_len);
2141 bzero(x4_proof, x4_proof_len);
2145 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1);
2146 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0);
2152 mm_answer_jpake_get_pwdata(int sock, Buffer *m)
2154 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2155 char *hash_scheme, *salt;
2158 fatal("%s: pctx == NULL", __func__);
2160 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt);
2163 /* pctx->s is sensitive, not returned to slave */
2164 buffer_put_cstring(m, hash_scheme);
2165 buffer_put_cstring(m, salt);
2167 debug3("%s: sending pwdata", __func__);
2168 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m);
2170 bzero(hash_scheme, strlen(hash_scheme));
2171 bzero(salt, strlen(salt));
2175 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1);
2181 mm_answer_jpake_step2(int sock, Buffer *m)
2183 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2184 u_char *x1_proof, *x2_proof, *x4_s_proof;
2185 u_int x1_proof_len, x2_proof_len, x4_s_proof_len;
2188 fatal("%s: pctx == NULL", __func__);
2190 if ((pctx->g_x1 = BN_new()) == NULL ||
2191 (pctx->g_x2 = BN_new()) == NULL)
2192 fatal("%s: BN_new", __func__);
2193 buffer_get_bignum2(m, pctx->g_x1);
2194 buffer_get_bignum2(m, pctx->g_x2);
2195 pctx->client_id = buffer_get_string(m, &pctx->client_id_len);
2196 x1_proof = buffer_get_string(m, &x1_proof_len);
2197 x2_proof = buffer_get_string(m, &x2_proof_len);
2199 jpake_step2(pctx->grp, pctx->s, pctx->g_x3,
2200 pctx->g_x1, pctx->g_x2, pctx->x4,
2201 pctx->client_id, pctx->client_id_len,
2202 pctx->server_id, pctx->server_id_len,
2203 x1_proof, x1_proof_len,
2204 x2_proof, x2_proof_len,
2206 &x4_s_proof, &x4_s_proof_len);
2208 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__));
2210 bzero(x1_proof, x1_proof_len);
2211 bzero(x2_proof, x2_proof_len);
2217 buffer_put_bignum2(m, pctx->b);
2218 buffer_put_string(m, x4_s_proof, x4_s_proof_len);
2220 debug3("%s: sending step2", __func__);
2221 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m);
2223 bzero(x4_s_proof, x4_s_proof_len);
2226 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1);
2232 mm_answer_jpake_key_confirm(int sock, Buffer *m)
2234 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2236 u_int x2_s_proof_len;
2239 fatal("%s: pctx == NULL", __func__);
2241 if ((pctx->a = BN_new()) == NULL)
2242 fatal("%s: BN_new", __func__);
2243 buffer_get_bignum2(m, pctx->a);
2244 x2_s_proof = buffer_get_string(m, &x2_s_proof_len);
2246 jpake_key_confirm(pctx->grp, pctx->s, pctx->a,
2247 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2,
2248 pctx->server_id, pctx->server_id_len,
2249 pctx->client_id, pctx->client_id_len,
2250 session_id2, session_id2_len,
2251 x2_s_proof, x2_s_proof_len,
2253 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len);
2255 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__));
2257 bzero(x2_s_proof, x2_s_proof_len);
2260 /* pctx->k is sensitive, not sent */
2261 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len);
2263 debug3("%s: sending confirmation hash", __func__);
2264 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m);
2266 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1);
2272 mm_answer_jpake_check_confirm(int sock, Buffer *m)
2274 int authenticated = 0;
2275 u_char *peer_confirm_hash;
2276 u_int peer_confirm_hash_len;
2277 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2280 fatal("%s: pctx == NULL", __func__);
2282 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len);
2284 authenticated = jpake_check_confirm(pctx->k,
2285 pctx->client_id, pctx->client_id_len,
2286 session_id2, session_id2_len,
2287 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid;
2289 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__));
2291 bzero(peer_confirm_hash, peer_confirm_hash_len);
2292 xfree(peer_confirm_hash);
2295 buffer_put_int(m, authenticated);
2297 debug3("%s: sending result %d", __func__, authenticated);
2298 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m);
2300 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1);
2302 auth_method = "jpake-01@openssh.com";
2303 return authenticated;