1 /* $OpenBSD: monitor.c,v 1.102 2009/05/25 06:48:01 andreas 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"
52 #include <openssl/dh.h>
54 #include "openbsd-compat/sys-queue.h"
64 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
67 #define TARGET_OS_MAC 1
72 #include "auth-options.h"
81 #include "monitor_mm.h"
85 #include "monitor_wrap.h"
86 #include "monitor_fdpass.h"
93 static Gssctxt *gsscontext = NULL;
97 extern ServerOptions options;
98 extern u_int utmp_len;
99 extern Newkeys *current_keys[];
100 extern z_stream incoming_stream;
101 extern z_stream outgoing_stream;
102 extern u_char session_id[];
103 extern Buffer auth_debug;
104 extern int auth_debug_init;
105 extern Buffer loginmsg;
107 /* State exported from the child */
130 /* Functions on the monitor that answer unprivileged requests */
132 int mm_answer_moduli(int, Buffer *);
133 int mm_answer_sign(int, Buffer *);
134 int mm_answer_pwnamallow(int, Buffer *);
135 int mm_answer_auth2_read_banner(int, Buffer *);
136 int mm_answer_authserv(int, Buffer *);
137 int mm_answer_authpassword(int, Buffer *);
138 int mm_answer_bsdauthquery(int, Buffer *);
139 int mm_answer_bsdauthrespond(int, Buffer *);
140 int mm_answer_skeyquery(int, Buffer *);
141 int mm_answer_skeyrespond(int, Buffer *);
142 int mm_answer_keyallowed(int, Buffer *);
143 int mm_answer_keyverify(int, Buffer *);
144 int mm_answer_pty(int, Buffer *);
145 int mm_answer_pty_cleanup(int, Buffer *);
146 int mm_answer_term(int, Buffer *);
147 int mm_answer_rsa_keyallowed(int, Buffer *);
148 int mm_answer_rsa_challenge(int, Buffer *);
149 int mm_answer_rsa_response(int, Buffer *);
150 int mm_answer_sesskey(int, Buffer *);
151 int mm_answer_sessid(int, Buffer *);
152 int mm_answer_jpake_get_pwdata(int, Buffer *);
153 int mm_answer_jpake_step1(int, Buffer *);
154 int mm_answer_jpake_step2(int, Buffer *);
155 int mm_answer_jpake_key_confirm(int, Buffer *);
156 int mm_answer_jpake_check_confirm(int, Buffer *);
159 int mm_answer_pam_start(int, Buffer *);
160 int mm_answer_pam_account(int, Buffer *);
161 int mm_answer_pam_init_ctx(int, Buffer *);
162 int mm_answer_pam_query(int, Buffer *);
163 int mm_answer_pam_respond(int, Buffer *);
164 int mm_answer_pam_free_ctx(int, Buffer *);
168 int mm_answer_gss_setup_ctx(int, Buffer *);
169 int mm_answer_gss_accept_ctx(int, Buffer *);
170 int mm_answer_gss_userok(int, Buffer *);
171 int mm_answer_gss_checkmic(int, Buffer *);
174 #ifdef SSH_AUDIT_EVENTS
175 int mm_answer_audit_event(int, Buffer *);
176 int mm_answer_audit_command(int, Buffer *);
179 static Authctxt *authctxt;
180 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
182 /* local state for key verify */
183 static u_char *key_blob = NULL;
184 static u_int key_bloblen = 0;
185 static int key_blobtype = MM_NOKEY;
186 static char *hostbased_cuser = NULL;
187 static char *hostbased_chost = NULL;
188 static char *auth_method = "unknown";
189 static u_int session_id2_len = 0;
190 static u_char *session_id2 = NULL;
191 static pid_t monitor_child_pid;
194 enum monitor_reqtype type;
196 int (*f)(int, Buffer *);
199 #define MON_ISAUTH 0x0004 /* Required for Authentication */
200 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
201 #define MON_ONCE 0x0010 /* Disable after calling */
202 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
204 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
206 #define MON_PERMIT 0x1000 /* Request is permitted */
208 struct mon_table mon_dispatch_proto20[] = {
209 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
210 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
211 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
212 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
213 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
214 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
216 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
217 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
218 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
219 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
220 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
221 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
223 #ifdef SSH_AUDIT_EVENTS
224 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
227 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
228 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
231 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
232 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
234 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
235 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
237 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
238 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
239 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
240 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
243 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata},
244 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1},
245 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2},
246 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm},
247 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm},
252 struct mon_table mon_dispatch_postauth20[] = {
253 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
254 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
255 {MONITOR_REQ_PTY, 0, mm_answer_pty},
256 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
257 {MONITOR_REQ_TERM, 0, mm_answer_term},
258 #ifdef SSH_AUDIT_EVENTS
259 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
260 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
265 struct mon_table mon_dispatch_proto15[] = {
266 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
267 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
268 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
269 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
270 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
271 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
272 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
273 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
275 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
276 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
279 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
280 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
283 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
284 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
285 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
286 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
287 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
288 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
290 #ifdef SSH_AUDIT_EVENTS
291 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
296 struct mon_table mon_dispatch_postauth15[] = {
297 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
298 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
299 {MONITOR_REQ_TERM, 0, mm_answer_term},
300 #ifdef SSH_AUDIT_EVENTS
301 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
302 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
307 struct mon_table *mon_dispatch;
309 /* Specifies if a certain message is allowed at the moment */
312 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
314 while (ent->f != NULL) {
315 if (ent->type == type) {
316 ent->flags &= ~MON_PERMIT;
317 ent->flags |= permit ? MON_PERMIT : 0;
325 monitor_permit_authentications(int permit)
327 struct mon_table *ent = mon_dispatch;
329 while (ent->f != NULL) {
330 if (ent->flags & MON_AUTH) {
331 ent->flags &= ~MON_PERMIT;
332 ent->flags |= permit ? MON_PERMIT : 0;
339 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
341 struct mon_table *ent;
342 int authenticated = 0;
344 debug3("preauth child monitor started");
346 authctxt = _authctxt;
347 memset(authctxt, 0, sizeof(*authctxt));
349 authctxt->loginmsg = &loginmsg;
352 mon_dispatch = mon_dispatch_proto20;
354 /* Permit requests for moduli and signatures */
355 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
356 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
358 mon_dispatch = mon_dispatch_proto15;
360 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
363 /* The first few requests do not require asynchronous access */
364 while (!authenticated) {
365 auth_method = "unknown";
366 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
368 if (!(ent->flags & MON_AUTHDECIDE))
369 fatal("%s: unexpected authentication from %d",
370 __func__, ent->type);
371 if (authctxt->pw->pw_uid == 0 &&
372 !auth_root_allowed(auth_method))
375 /* PAM needs to perform account checks after auth */
376 if (options.use_pam && authenticated) {
380 mm_request_receive_expect(pmonitor->m_sendfd,
381 MONITOR_REQ_PAM_ACCOUNT, &m);
382 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
388 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
389 auth_log(authctxt, authenticated, auth_method,
390 compat20 ? " ssh2" : "");
392 authctxt->failures++;
395 /* Cleanup JPAKE context after authentication */
396 if (ent->flags & MON_AUTHDECIDE) {
397 if (authctxt->jpake_ctx != NULL) {
398 jpake_free(authctxt->jpake_ctx);
399 authctxt->jpake_ctx = NULL;
405 if (!authctxt->valid)
406 fatal("%s: authenticated invalid user", __func__);
407 if (strcmp(auth_method, "unknown") == 0)
408 fatal("%s: authentication method name unknown", __func__);
410 debug("%s: %s has been authenticated by privileged process",
411 __func__, authctxt->user);
413 mm_get_keystate(pmonitor);
417 monitor_set_child_handler(pid_t pid)
419 monitor_child_pid = pid;
423 monitor_child_handler(int sig)
425 kill(monitor_child_pid, sig);
429 monitor_child_postauth(struct monitor *pmonitor)
431 monitor_set_child_handler(pmonitor->m_pid);
432 signal(SIGHUP, &monitor_child_handler);
433 signal(SIGTERM, &monitor_child_handler);
434 signal(SIGINT, &monitor_child_handler);
437 mon_dispatch = mon_dispatch_postauth20;
439 /* Permit requests for moduli and signatures */
440 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
441 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
442 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
444 mon_dispatch = mon_dispatch_postauth15;
445 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
448 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
449 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
453 monitor_read(pmonitor, mon_dispatch, NULL);
457 monitor_sync(struct monitor *pmonitor)
459 if (options.compression) {
460 /* The member allocation is not visible, so sync it */
461 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
466 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
467 struct mon_table **pent)
475 mm_request_receive(pmonitor->m_sendfd, &m);
476 type = buffer_get_char(&m);
478 debug3("%s: checking request %d", __func__, type);
480 while (ent->f != NULL) {
481 if (ent->type == type)
486 if (ent->f != NULL) {
487 if (!(ent->flags & MON_PERMIT))
488 fatal("%s: unpermitted request %d", __func__,
490 ret = (*ent->f)(pmonitor->m_sendfd, &m);
493 /* The child may use this request only once, disable it */
494 if (ent->flags & MON_ONCE) {
495 debug2("%s: %d used once, disabling now", __func__,
497 ent->flags &= ~MON_PERMIT;
506 fatal("%s: unsupported request: %d", __func__, type);
512 /* allowed key state */
514 monitor_allowed_key(u_char *blob, u_int bloblen)
516 /* make sure key is allowed */
517 if (key_blob == NULL || key_bloblen != bloblen ||
518 memcmp(key_blob, blob, key_bloblen))
524 monitor_reset_key_state(void)
527 if (key_blob != NULL)
529 if (hostbased_cuser != NULL)
530 xfree(hostbased_cuser);
531 if (hostbased_chost != NULL)
532 xfree(hostbased_chost);
535 key_blobtype = MM_NOKEY;
536 hostbased_cuser = NULL;
537 hostbased_chost = NULL;
541 mm_answer_moduli(int sock, Buffer *m)
546 min = buffer_get_int(m);
547 want = buffer_get_int(m);
548 max = buffer_get_int(m);
550 debug3("%s: got parameters: %d %d %d",
551 __func__, min, want, max);
552 /* We need to check here, too, in case the child got corrupted */
553 if (max < min || want < min || max < want)
554 fatal("%s: bad parameters: %d %d %d",
555 __func__, min, want, max);
559 dh = choose_dh(min, want, max);
561 buffer_put_char(m, 0);
564 /* Send first bignum */
565 buffer_put_char(m, 1);
566 buffer_put_bignum2(m, dh->p);
567 buffer_put_bignum2(m, dh->g);
571 mm_request_send(sock, MONITOR_ANS_MODULI, m);
576 mm_answer_sign(int sock, Buffer *m)
581 u_int siglen, datlen;
584 debug3("%s", __func__);
586 keyid = buffer_get_int(m);
587 p = buffer_get_string(m, &datlen);
590 * Supported KEX types will only return SHA1 (20 byte) or
591 * SHA256 (32 byte) hashes
593 if (datlen != 20 && datlen != 32)
594 fatal("%s: data length incorrect: %u", __func__, datlen);
596 /* save session id, it will be passed on the first call */
597 if (session_id2_len == 0) {
598 session_id2_len = datlen;
599 session_id2 = xmalloc(session_id2_len);
600 memcpy(session_id2, p, session_id2_len);
603 if ((key = get_hostkey_by_index(keyid)) == NULL)
604 fatal("%s: no hostkey from index %d", __func__, keyid);
605 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
606 fatal("%s: key_sign failed", __func__);
608 debug3("%s: signature %p(%u)", __func__, signature, siglen);
611 buffer_put_string(m, signature, siglen);
616 mm_request_send(sock, MONITOR_ANS_SIGN, m);
618 /* Turn on permissions for getpwnam */
619 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
624 /* Retrieves the password entry and also checks if the user is permitted */
627 mm_answer_pwnamallow(int sock, Buffer *m)
630 struct passwd *pwent;
633 debug3("%s", __func__);
635 if (authctxt->attempt++ != 0)
636 fatal("%s: multiple attempts for getpwnam", __func__);
638 username = buffer_get_string(m, NULL);
640 pwent = getpwnamallow(username);
642 authctxt->user = xstrdup(username);
643 setproctitle("%s [priv]", pwent ? username : "unknown");
649 buffer_put_char(m, 0);
650 authctxt->pw = fakepw();
655 authctxt->pw = pwent;
658 buffer_put_char(m, 1);
659 buffer_put_string(m, pwent, sizeof(struct passwd));
660 buffer_put_cstring(m, pwent->pw_name);
661 buffer_put_cstring(m, "*");
662 buffer_put_cstring(m, pwent->pw_gecos);
663 #ifdef HAVE_PW_CLASS_IN_PASSWD
664 buffer_put_cstring(m, pwent->pw_class);
666 buffer_put_cstring(m, pwent->pw_dir);
667 buffer_put_cstring(m, pwent->pw_shell);
670 buffer_put_string(m, &options, sizeof(options));
671 if (options.banner != NULL)
672 buffer_put_cstring(m, options.banner);
673 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
674 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
676 /* For SSHv1 allow authentication now */
678 monitor_permit_authentications(1);
680 /* Allow service/style information on the auth context */
681 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
682 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
687 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
693 int mm_answer_auth2_read_banner(int sock, Buffer *m)
698 banner = auth2_read_banner();
699 buffer_put_cstring(m, banner != NULL ? banner : "");
700 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
709 mm_answer_authserv(int sock, Buffer *m)
711 monitor_permit_authentications(1);
713 authctxt->service = buffer_get_string(m, NULL);
714 authctxt->style = buffer_get_string(m, NULL);
715 debug3("%s: service=%s, style=%s",
716 __func__, authctxt->service, authctxt->style);
718 if (strlen(authctxt->style) == 0) {
719 xfree(authctxt->style);
720 authctxt->style = NULL;
727 mm_answer_authpassword(int sock, Buffer *m)
729 static int call_count;
734 passwd = buffer_get_string(m, &plen);
735 /* Only authenticate if the context is valid */
736 authenticated = options.password_authentication &&
737 auth_password(authctxt, passwd);
738 memset(passwd, 0, strlen(passwd));
742 buffer_put_int(m, authenticated);
744 debug3("%s: sending result %d", __func__, authenticated);
745 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
748 if (plen == 0 && call_count == 1)
749 auth_method = "none";
751 auth_method = "password";
753 /* Causes monitor loop to terminate if authenticated */
754 return (authenticated);
759 mm_answer_bsdauthquery(int sock, Buffer *m)
761 char *name, *infotxt;
767 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
768 &prompts, &echo_on) < 0 ? 0 : 1;
771 buffer_put_int(m, success);
773 buffer_put_cstring(m, prompts[0]);
775 debug3("%s: sending challenge success: %u", __func__, success);
776 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
789 mm_answer_bsdauthrespond(int sock, Buffer *m)
794 if (authctxt->as == 0)
795 fatal("%s: no bsd auth session", __func__);
797 response = buffer_get_string(m, NULL);
798 authok = options.challenge_response_authentication &&
799 auth_userresponse(authctxt->as, response, 0);
801 debug3("%s: <%s> = <%d>", __func__, response, authok);
805 buffer_put_int(m, authok);
807 debug3("%s: sending authenticated: %d", __func__, authok);
808 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
810 auth_method = "bsdauth";
812 return (authok != 0);
818 mm_answer_skeyquery(int sock, Buffer *m)
821 char challenge[1024];
824 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
825 sizeof(challenge)) < 0 ? 0 : 1;
828 buffer_put_int(m, success);
830 buffer_put_cstring(m, challenge);
832 debug3("%s: sending challenge success: %u", __func__, success);
833 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
839 mm_answer_skeyrespond(int sock, Buffer *m)
844 response = buffer_get_string(m, NULL);
846 authok = (options.challenge_response_authentication &&
848 skey_haskey(authctxt->pw->pw_name) == 0 &&
849 skey_passcheck(authctxt->pw->pw_name, response) != -1);
854 buffer_put_int(m, authok);
856 debug3("%s: sending authenticated: %d", __func__, authok);
857 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
859 auth_method = "skey";
861 return (authok != 0);
867 mm_answer_pam_start(int sock, Buffer *m)
869 if (!options.use_pam)
870 fatal("UsePAM not set, but ended up in %s anyway", __func__);
874 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
880 mm_answer_pam_account(int sock, Buffer *m)
884 if (!options.use_pam)
885 fatal("UsePAM not set, but ended up in %s anyway", __func__);
887 ret = do_pam_account();
889 buffer_put_int(m, ret);
890 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
892 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
897 static void *sshpam_ctxt, *sshpam_authok;
898 extern KbdintDevice sshpam_device;
901 mm_answer_pam_init_ctx(int sock, Buffer *m)
904 debug3("%s", __func__);
905 authctxt->user = buffer_get_string(m, NULL);
906 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
907 sshpam_authok = NULL;
909 if (sshpam_ctxt != NULL) {
910 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
911 buffer_put_int(m, 1);
913 buffer_put_int(m, 0);
915 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
920 mm_answer_pam_query(int sock, Buffer *m)
922 char *name, *info, **prompts;
923 u_int i, num, *echo_on;
926 debug3("%s", __func__);
927 sshpam_authok = NULL;
928 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
929 if (ret == 0 && num == 0)
930 sshpam_authok = sshpam_ctxt;
931 if (num > 1 || name == NULL || info == NULL)
934 buffer_put_int(m, ret);
935 buffer_put_cstring(m, name);
937 buffer_put_cstring(m, info);
939 buffer_put_int(m, num);
940 for (i = 0; i < num; ++i) {
941 buffer_put_cstring(m, prompts[i]);
943 buffer_put_int(m, echo_on[i]);
949 auth_method = "keyboard-interactive/pam";
950 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
955 mm_answer_pam_respond(int sock, Buffer *m)
961 debug3("%s", __func__);
962 sshpam_authok = NULL;
963 num = buffer_get_int(m);
965 resp = xcalloc(num, sizeof(char *));
966 for (i = 0; i < num; ++i)
967 resp[i] = buffer_get_string(m, NULL);
968 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
969 for (i = 0; i < num; ++i)
973 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
976 buffer_put_int(m, ret);
977 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
978 auth_method = "keyboard-interactive/pam";
980 sshpam_authok = sshpam_ctxt;
985 mm_answer_pam_free_ctx(int sock, Buffer *m)
988 debug3("%s", __func__);
989 (sshpam_device.free_ctx)(sshpam_ctxt);
991 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
992 auth_method = "keyboard-interactive/pam";
993 return (sshpam_authok == sshpam_ctxt);
998 mm_append_debug(Buffer *m)
1000 if (auth_debug_init && buffer_len(&auth_debug)) {
1001 debug3("%s: Appending debug messages for child", __func__);
1002 buffer_append(m, buffer_ptr(&auth_debug),
1003 buffer_len(&auth_debug));
1004 buffer_clear(&auth_debug);
1009 mm_answer_keyallowed(int sock, Buffer *m)
1012 char *cuser, *chost;
1015 enum mm_keytype type = 0;
1018 debug3("%s entering", __func__);
1020 type = buffer_get_int(m);
1021 cuser = buffer_get_string(m, NULL);
1022 chost = buffer_get_string(m, NULL);
1023 blob = buffer_get_string(m, &bloblen);
1025 key = key_from_blob(blob, bloblen);
1027 if ((compat20 && type == MM_RSAHOSTKEY) ||
1028 (!compat20 && type != MM_RSAHOSTKEY))
1029 fatal("%s: key type and protocol mismatch", __func__);
1031 debug3("%s: key_from_blob: %p", __func__, key);
1033 if (key != NULL && authctxt->valid) {
1036 allowed = options.pubkey_authentication &&
1037 user_key_allowed(authctxt->pw, key);
1038 auth_method = "publickey";
1039 if (options.pubkey_authentication && allowed != 1)
1040 auth_clear_options();
1043 allowed = options.hostbased_authentication &&
1044 hostbased_key_allowed(authctxt->pw,
1046 auth_method = "hostbased";
1049 key->type = KEY_RSA1; /* XXX */
1050 allowed = options.rhosts_rsa_authentication &&
1051 auth_rhosts_rsa_key_allowed(authctxt->pw,
1053 if (options.rhosts_rsa_authentication && allowed != 1)
1054 auth_clear_options();
1055 auth_method = "rsa";
1058 fatal("%s: unknown key type %d", __func__, type);
1065 /* clear temporarily storage (used by verify) */
1066 monitor_reset_key_state();
1069 /* Save temporarily for comparison in verify */
1071 key_bloblen = bloblen;
1072 key_blobtype = type;
1073 hostbased_cuser = cuser;
1074 hostbased_chost = chost;
1076 /* Log failed attempt */
1077 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
1083 debug3("%s: key %p is %s",
1084 __func__, key, allowed ? "allowed" : "not allowed");
1087 buffer_put_int(m, allowed);
1088 buffer_put_int(m, forced_command != NULL);
1092 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1094 if (type == MM_RSAHOSTKEY)
1095 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1101 monitor_valid_userblob(u_char *data, u_int datalen)
1109 buffer_append(&b, data, datalen);
1111 if (datafellows & SSH_OLD_SESSIONID) {
1113 len = buffer_len(&b);
1114 if ((session_id2 == NULL) ||
1115 (len < session_id2_len) ||
1116 (memcmp(p, session_id2, session_id2_len) != 0))
1118 buffer_consume(&b, session_id2_len);
1120 p = buffer_get_string(&b, &len);
1121 if ((session_id2 == NULL) ||
1122 (len != session_id2_len) ||
1123 (memcmp(p, session_id2, session_id2_len) != 0))
1127 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1129 p = buffer_get_string(&b, NULL);
1130 if (strcmp(authctxt->user, p) != 0) {
1131 logit("wrong user name passed to monitor: expected %s != %.100s",
1136 buffer_skip_string(&b);
1137 if (datafellows & SSH_BUG_PKAUTH) {
1138 if (!buffer_get_char(&b))
1141 p = buffer_get_string(&b, NULL);
1142 if (strcmp("publickey", p) != 0)
1145 if (!buffer_get_char(&b))
1147 buffer_skip_string(&b);
1149 buffer_skip_string(&b);
1150 if (buffer_len(&b) != 0)
1157 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1166 buffer_append(&b, data, datalen);
1168 p = buffer_get_string(&b, &len);
1169 if ((session_id2 == NULL) ||
1170 (len != session_id2_len) ||
1171 (memcmp(p, session_id2, session_id2_len) != 0))
1175 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1177 p = buffer_get_string(&b, NULL);
1178 if (strcmp(authctxt->user, p) != 0) {
1179 logit("wrong user name passed to monitor: expected %s != %.100s",
1184 buffer_skip_string(&b); /* service */
1185 p = buffer_get_string(&b, NULL);
1186 if (strcmp(p, "hostbased") != 0)
1189 buffer_skip_string(&b); /* pkalg */
1190 buffer_skip_string(&b); /* pkblob */
1192 /* verify client host, strip trailing dot if necessary */
1193 p = buffer_get_string(&b, NULL);
1194 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1196 if (strcmp(p, chost) != 0)
1200 /* verify client user */
1201 p = buffer_get_string(&b, NULL);
1202 if (strcmp(p, cuser) != 0)
1206 if (buffer_len(&b) != 0)
1213 mm_answer_keyverify(int sock, Buffer *m)
1216 u_char *signature, *data, *blob;
1217 u_int signaturelen, datalen, bloblen;
1221 blob = buffer_get_string(m, &bloblen);
1222 signature = buffer_get_string(m, &signaturelen);
1223 data = buffer_get_string(m, &datalen);
1225 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1226 !monitor_allowed_key(blob, bloblen))
1227 fatal("%s: bad key, not previously allowed", __func__);
1229 key = key_from_blob(blob, bloblen);
1231 fatal("%s: bad public key blob", __func__);
1233 switch (key_blobtype) {
1235 valid_data = monitor_valid_userblob(data, datalen);
1238 valid_data = monitor_valid_hostbasedblob(data, datalen,
1239 hostbased_cuser, hostbased_chost);
1246 fatal("%s: bad signature data blob", __func__);
1248 verified = key_verify(key, signature, signaturelen, data, datalen);
1249 debug3("%s: key %p signature %s",
1250 __func__, key, (verified == 1) ? "verified" : "unverified");
1257 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1259 monitor_reset_key_state();
1262 buffer_put_int(m, verified);
1263 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1265 return (verified == 1);
1269 mm_record_login(Session *s, struct passwd *pw)
1272 struct sockaddr_storage from;
1275 * Get IP address of client. If the connection is not a socket, let
1276 * the address be 0.0.0.0.
1278 memset(&from, 0, sizeof(from));
1279 fromlen = sizeof(from);
1280 if (packet_connection_is_on_socket()) {
1281 if (getpeername(packet_get_connection_in(),
1282 (struct sockaddr *)&from, &fromlen) < 0) {
1283 debug("getpeername: %.100s", strerror(errno));
1287 /* Record that there was a login on that tty from the remote host. */
1288 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1289 get_remote_name_or_ip(utmp_len, options.use_dns),
1290 (struct sockaddr *)&from, fromlen);
1294 mm_session_close(Session *s)
1296 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1297 if (s->ttyfd != -1) {
1298 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1299 session_pty_cleanup2(s);
1301 session_unused(s->self);
1305 mm_answer_pty(int sock, Buffer *m)
1307 extern struct monitor *pmonitor;
1311 debug3("%s entering", __func__);
1317 s->authctxt = authctxt;
1318 s->pw = authctxt->pw;
1319 s->pid = pmonitor->m_pid;
1320 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1323 pty_setowner(authctxt->pw, s->tty);
1325 buffer_put_int(m, 1);
1326 buffer_put_cstring(m, s->tty);
1328 /* We need to trick ttyslot */
1329 if (dup2(s->ttyfd, 0) == -1)
1330 fatal("%s: dup2", __func__);
1332 mm_record_login(s, authctxt->pw);
1334 /* Now we can close the file descriptor again */
1337 /* send messages generated by record_login */
1338 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1339 buffer_clear(&loginmsg);
1341 mm_request_send(sock, MONITOR_ANS_PTY, m);
1343 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1344 mm_send_fd(sock, s->ttyfd) == -1)
1345 fatal("%s: send fds failed", __func__);
1347 /* make sure nothing uses fd 0 */
1348 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1349 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1351 error("%s: fd0 %d != 0", __func__, fd0);
1353 /* slave is not needed */
1355 s->ttyfd = s->ptyfd;
1356 /* no need to dup() because nobody closes ptyfd */
1357 s->ptymaster = s->ptyfd;
1359 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1365 mm_session_close(s);
1366 buffer_put_int(m, 0);
1367 mm_request_send(sock, MONITOR_ANS_PTY, m);
1372 mm_answer_pty_cleanup(int sock, Buffer *m)
1377 debug3("%s entering", __func__);
1379 tty = buffer_get_string(m, NULL);
1380 if ((s = session_by_tty(tty)) != NULL)
1381 mm_session_close(s);
1388 mm_answer_sesskey(int sock, Buffer *m)
1393 /* Turn off permissions */
1394 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1396 if ((p = BN_new()) == NULL)
1397 fatal("%s: BN_new", __func__);
1399 buffer_get_bignum2(m, p);
1401 rsafail = ssh1_session_key(p);
1404 buffer_put_int(m, rsafail);
1405 buffer_put_bignum2(m, p);
1409 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1411 /* Turn on permissions for sessid passing */
1412 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1418 mm_answer_sessid(int sock, Buffer *m)
1422 debug3("%s entering", __func__);
1424 if (buffer_len(m) != 16)
1425 fatal("%s: bad ssh1 session id", __func__);
1426 for (i = 0; i < 16; i++)
1427 session_id[i] = buffer_get_char(m);
1429 /* Turn on permissions for getpwnam */
1430 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1436 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1440 u_char *blob = NULL;
1444 debug3("%s entering", __func__);
1446 auth_method = "rsa";
1447 if (options.rsa_authentication && authctxt->valid) {
1448 if ((client_n = BN_new()) == NULL)
1449 fatal("%s: BN_new", __func__);
1450 buffer_get_bignum2(m, client_n);
1451 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1452 BN_clear_free(client_n);
1455 buffer_put_int(m, allowed);
1456 buffer_put_int(m, forced_command != NULL);
1458 /* clear temporarily storage (used by generate challenge) */
1459 monitor_reset_key_state();
1461 if (allowed && key != NULL) {
1462 key->type = KEY_RSA; /* cheat for key_to_blob */
1463 if (key_to_blob(key, &blob, &blen) == 0)
1464 fatal("%s: key_to_blob failed", __func__);
1465 buffer_put_string(m, blob, blen);
1467 /* Save temporarily for comparison in verify */
1470 key_blobtype = MM_RSAUSERKEY;
1477 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1479 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1480 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1485 mm_answer_rsa_challenge(int sock, Buffer *m)
1491 debug3("%s entering", __func__);
1493 if (!authctxt->valid)
1494 fatal("%s: authctxt not valid", __func__);
1495 blob = buffer_get_string(m, &blen);
1496 if (!monitor_allowed_key(blob, blen))
1497 fatal("%s: bad key, not previously allowed", __func__);
1498 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1499 fatal("%s: key type mismatch", __func__);
1500 if ((key = key_from_blob(blob, blen)) == NULL)
1501 fatal("%s: received bad key", __func__);
1502 if (key->type != KEY_RSA)
1503 fatal("%s: received bad key type %d", __func__, key->type);
1504 key->type = KEY_RSA1;
1506 BN_clear_free(ssh1_challenge);
1507 ssh1_challenge = auth_rsa_generate_challenge(key);
1510 buffer_put_bignum2(m, ssh1_challenge);
1512 debug3("%s sending reply", __func__);
1513 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1515 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1523 mm_answer_rsa_response(int sock, Buffer *m)
1526 u_char *blob, *response;
1530 debug3("%s entering", __func__);
1532 if (!authctxt->valid)
1533 fatal("%s: authctxt not valid", __func__);
1534 if (ssh1_challenge == NULL)
1535 fatal("%s: no ssh1_challenge", __func__);
1537 blob = buffer_get_string(m, &blen);
1538 if (!monitor_allowed_key(blob, blen))
1539 fatal("%s: bad key, not previously allowed", __func__);
1540 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1541 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1542 if ((key = key_from_blob(blob, blen)) == NULL)
1543 fatal("%s: received bad key", __func__);
1544 response = buffer_get_string(m, &len);
1546 fatal("%s: received bad response to challenge", __func__);
1547 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1553 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1556 BN_clear_free(ssh1_challenge);
1557 ssh1_challenge = NULL;
1558 monitor_reset_key_state();
1561 buffer_put_int(m, success);
1562 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1568 mm_answer_term(int sock, Buffer *req)
1570 extern struct monitor *pmonitor;
1573 debug3("%s: tearing down sessions", __func__);
1575 /* The child is terminating */
1576 session_destroy_all(&mm_session_close);
1579 if (options.use_pam)
1583 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1587 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1589 /* Terminate process */
1593 #ifdef SSH_AUDIT_EVENTS
1594 /* Report that an audit event occurred */
1596 mm_answer_audit_event(int socket, Buffer *m)
1598 ssh_audit_event_t event;
1600 debug3("%s entering", __func__);
1602 event = buffer_get_int(m);
1604 case SSH_AUTH_FAIL_PUBKEY:
1605 case SSH_AUTH_FAIL_HOSTBASED:
1606 case SSH_AUTH_FAIL_GSSAPI:
1607 case SSH_LOGIN_EXCEED_MAXTRIES:
1608 case SSH_LOGIN_ROOT_DENIED:
1609 case SSH_CONNECTION_CLOSE:
1610 case SSH_INVALID_USER:
1614 fatal("Audit event type %d not permitted", event);
1621 mm_answer_audit_command(int socket, Buffer *m)
1626 debug3("%s entering", __func__);
1627 cmd = buffer_get_string(m, &len);
1628 /* sanity check command, if so how? */
1629 audit_run_command(cmd);
1633 #endif /* SSH_AUDIT_EVENTS */
1636 monitor_apply_keystate(struct monitor *pmonitor)
1639 set_newkeys(MODE_IN);
1640 set_newkeys(MODE_OUT);
1642 packet_set_protocol_flags(child_state.ssh1protoflags);
1643 packet_set_encryption_key(child_state.ssh1key,
1644 child_state.ssh1keylen, child_state.ssh1cipher);
1645 xfree(child_state.ssh1key);
1648 /* for rc4 and other stateful ciphers */
1649 packet_set_keycontext(MODE_OUT, child_state.keyout);
1650 xfree(child_state.keyout);
1651 packet_set_keycontext(MODE_IN, child_state.keyin);
1652 xfree(child_state.keyin);
1655 packet_set_iv(MODE_OUT, child_state.ivout);
1656 xfree(child_state.ivout);
1657 packet_set_iv(MODE_IN, child_state.ivin);
1658 xfree(child_state.ivin);
1661 memcpy(&incoming_stream, &child_state.incoming,
1662 sizeof(incoming_stream));
1663 memcpy(&outgoing_stream, &child_state.outgoing,
1664 sizeof(outgoing_stream));
1666 /* Update with new address */
1667 if (options.compression)
1668 mm_init_compression(pmonitor->m_zlib);
1670 /* Network I/O buffers */
1671 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1672 buffer_clear(packet_get_input());
1673 buffer_append(packet_get_input(), child_state.input, child_state.ilen);
1674 memset(child_state.input, 0, child_state.ilen);
1675 xfree(child_state.input);
1677 buffer_clear(packet_get_output());
1678 buffer_append(packet_get_output(), child_state.output,
1680 memset(child_state.output, 0, child_state.olen);
1681 xfree(child_state.output);
1685 mm_get_kex(Buffer *m)
1691 kex = xcalloc(1, sizeof(*kex));
1692 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1693 if ((session_id2 == NULL) ||
1694 (kex->session_id_len != session_id2_len) ||
1695 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1696 fatal("mm_get_get: internal error: bad session id");
1697 kex->we_need = buffer_get_int(m);
1698 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1699 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1700 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1701 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1703 kex->hostkey_type = buffer_get_int(m);
1704 kex->kex_type = buffer_get_int(m);
1705 blob = buffer_get_string(m, &bloblen);
1706 buffer_init(&kex->my);
1707 buffer_append(&kex->my, blob, bloblen);
1709 blob = buffer_get_string(m, &bloblen);
1710 buffer_init(&kex->peer);
1711 buffer_append(&kex->peer, blob, bloblen);
1714 kex->flags = buffer_get_int(m);
1715 kex->client_version_string = buffer_get_string(m, NULL);
1716 kex->server_version_string = buffer_get_string(m, NULL);
1717 kex->load_host_key=&get_hostkey_by_type;
1718 kex->host_key_index=&get_hostkey_index;
1723 /* This function requries careful sanity checking */
1726 mm_get_keystate(struct monitor *pmonitor)
1730 u_int bloblen, plen;
1731 u_int32_t seqnr, packets;
1732 u_int64_t blocks, bytes;
1734 debug3("%s: Waiting for new keys", __func__);
1737 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1739 child_state.ssh1protoflags = buffer_get_int(&m);
1740 child_state.ssh1cipher = buffer_get_int(&m);
1741 child_state.ssh1key = buffer_get_string(&m,
1742 &child_state.ssh1keylen);
1743 child_state.ivout = buffer_get_string(&m,
1744 &child_state.ivoutlen);
1745 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1748 /* Get the Kex for rekeying */
1749 *pmonitor->m_pkex = mm_get_kex(&m);
1752 blob = buffer_get_string(&m, &bloblen);
1753 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1756 debug3("%s: Waiting for second key", __func__);
1757 blob = buffer_get_string(&m, &bloblen);
1758 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1761 /* Now get sequence numbers for the packets */
1762 seqnr = buffer_get_int(&m);
1763 blocks = buffer_get_int64(&m);
1764 packets = buffer_get_int(&m);
1765 bytes = buffer_get_int64(&m);
1766 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1767 seqnr = buffer_get_int(&m);
1768 blocks = buffer_get_int64(&m);
1769 packets = buffer_get_int(&m);
1770 bytes = buffer_get_int64(&m);
1771 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1774 /* Get the key context */
1775 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1776 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1778 debug3("%s: Getting compression state", __func__);
1779 /* Get compression state */
1780 p = buffer_get_string(&m, &plen);
1781 if (plen != sizeof(child_state.outgoing))
1782 fatal("%s: bad request size", __func__);
1783 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1786 p = buffer_get_string(&m, &plen);
1787 if (plen != sizeof(child_state.incoming))
1788 fatal("%s: bad request size", __func__);
1789 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1792 /* Network I/O buffers */
1793 debug3("%s: Getting Network I/O buffers", __func__);
1794 child_state.input = buffer_get_string(&m, &child_state.ilen);
1795 child_state.output = buffer_get_string(&m, &child_state.olen);
1801 /* Allocation functions for zlib */
1803 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1805 size_t len = (size_t) size * ncount;
1808 if (len == 0 || ncount > SIZE_T_MAX / size)
1809 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1811 address = mm_malloc(mm, len);
1817 mm_zfree(struct mm_master *mm, void *address)
1819 mm_free(mm, address);
1823 mm_init_compression(struct mm_master *mm)
1825 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1826 outgoing_stream.zfree = (free_func)mm_zfree;
1827 outgoing_stream.opaque = mm;
1829 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1830 incoming_stream.zfree = (free_func)mm_zfree;
1831 incoming_stream.opaque = mm;
1836 #define FD_CLOSEONEXEC(x) do { \
1837 if (fcntl(x, F_SETFD, 1) == -1) \
1838 fatal("fcntl(%d, F_SETFD)", x); \
1842 monitor_socketpair(int *pair)
1844 #ifdef HAVE_SOCKETPAIR
1845 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1846 fatal("%s: socketpair", __func__);
1848 fatal("%s: UsePrivilegeSeparation=yes not supported",
1851 FD_CLOSEONEXEC(pair[0]);
1852 FD_CLOSEONEXEC(pair[1]);
1855 #define MM_MEMSIZE 65536
1860 struct monitor *mon;
1863 mon = xcalloc(1, sizeof(*mon));
1865 monitor_socketpair(pair);
1867 mon->m_recvfd = pair[0];
1868 mon->m_sendfd = pair[1];
1870 /* Used to share zlib space across processes */
1871 if (options.compression) {
1872 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1873 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1875 /* Compression needs to share state across borders */
1876 mm_init_compression(mon->m_zlib);
1883 monitor_reinit(struct monitor *mon)
1887 monitor_socketpair(pair);
1889 mon->m_recvfd = pair[0];
1890 mon->m_sendfd = pair[1];
1895 mm_answer_gss_setup_ctx(int sock, Buffer *m)
1901 goid.elements = buffer_get_string(m, &len);
1904 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1906 xfree(goid.elements);
1909 buffer_put_int(m, major);
1911 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1913 /* Now we have a context, enable the step */
1914 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1920 mm_answer_gss_accept_ctx(int sock, Buffer *m)
1923 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1924 OM_uint32 major, minor;
1925 OM_uint32 flags = 0; /* GSI needs this */
1928 in.value = buffer_get_string(m, &len);
1930 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1934 buffer_put_int(m, major);
1935 buffer_put_string(m, out.value, out.length);
1936 buffer_put_int(m, flags);
1937 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1939 gss_release_buffer(&minor, &out);
1941 if (major == GSS_S_COMPLETE) {
1942 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1943 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1944 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1950 mm_answer_gss_checkmic(int sock, Buffer *m)
1952 gss_buffer_desc gssbuf, mic;
1956 gssbuf.value = buffer_get_string(m, &len);
1957 gssbuf.length = len;
1958 mic.value = buffer_get_string(m, &len);
1961 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1963 xfree(gssbuf.value);
1967 buffer_put_int(m, ret);
1969 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1971 if (!GSS_ERROR(ret))
1972 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1978 mm_answer_gss_userok(int sock, Buffer *m)
1982 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1985 buffer_put_int(m, authenticated);
1987 debug3("%s: sending result %d", __func__, authenticated);
1988 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1990 auth_method = "gssapi-with-mic";
1992 /* Monitor loop will terminate if authenticated */
1993 return (authenticated);
1999 mm_answer_jpake_step1(int sock, Buffer *m)
2001 struct jpake_ctx *pctx;
2002 u_char *x3_proof, *x4_proof;
2003 u_int x3_proof_len, x4_proof_len;
2005 if (!options.zero_knowledge_password_authentication)
2006 fatal("zero_knowledge_password_authentication disabled");
2008 if (authctxt->jpake_ctx != NULL)
2009 fatal("%s: authctxt->jpake_ctx already set (%p)",
2010 __func__, authctxt->jpake_ctx);
2011 authctxt->jpake_ctx = pctx = jpake_new();
2013 jpake_step1(pctx->grp,
2014 &pctx->server_id, &pctx->server_id_len,
2015 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4,
2016 &x3_proof, &x3_proof_len,
2017 &x4_proof, &x4_proof_len);
2019 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__));
2023 buffer_put_string(m, pctx->server_id, pctx->server_id_len);
2024 buffer_put_bignum2(m, pctx->g_x3);
2025 buffer_put_bignum2(m, pctx->g_x4);
2026 buffer_put_string(m, x3_proof, x3_proof_len);
2027 buffer_put_string(m, x4_proof, x4_proof_len);
2029 debug3("%s: sending step1", __func__);
2030 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m);
2032 bzero(x3_proof, x3_proof_len);
2033 bzero(x4_proof, x4_proof_len);
2037 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1);
2038 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0);
2044 mm_answer_jpake_get_pwdata(int sock, Buffer *m)
2046 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2047 char *hash_scheme, *salt;
2050 fatal("%s: pctx == NULL", __func__);
2052 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt);
2055 /* pctx->s is sensitive, not returned to slave */
2056 buffer_put_cstring(m, hash_scheme);
2057 buffer_put_cstring(m, salt);
2059 debug3("%s: sending pwdata", __func__);
2060 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m);
2062 bzero(hash_scheme, strlen(hash_scheme));
2063 bzero(salt, strlen(salt));
2067 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1);
2073 mm_answer_jpake_step2(int sock, Buffer *m)
2075 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2076 u_char *x1_proof, *x2_proof, *x4_s_proof;
2077 u_int x1_proof_len, x2_proof_len, x4_s_proof_len;
2080 fatal("%s: pctx == NULL", __func__);
2082 if ((pctx->g_x1 = BN_new()) == NULL ||
2083 (pctx->g_x2 = BN_new()) == NULL)
2084 fatal("%s: BN_new", __func__);
2085 buffer_get_bignum2(m, pctx->g_x1);
2086 buffer_get_bignum2(m, pctx->g_x2);
2087 pctx->client_id = buffer_get_string(m, &pctx->client_id_len);
2088 x1_proof = buffer_get_string(m, &x1_proof_len);
2089 x2_proof = buffer_get_string(m, &x2_proof_len);
2091 jpake_step2(pctx->grp, pctx->s, pctx->g_x3,
2092 pctx->g_x1, pctx->g_x2, pctx->x4,
2093 pctx->client_id, pctx->client_id_len,
2094 pctx->server_id, pctx->server_id_len,
2095 x1_proof, x1_proof_len,
2096 x2_proof, x2_proof_len,
2098 &x4_s_proof, &x4_s_proof_len);
2100 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__));
2102 bzero(x1_proof, x1_proof_len);
2103 bzero(x2_proof, x2_proof_len);
2109 buffer_put_bignum2(m, pctx->b);
2110 buffer_put_string(m, x4_s_proof, x4_s_proof_len);
2112 debug3("%s: sending step2", __func__);
2113 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m);
2115 bzero(x4_s_proof, x4_s_proof_len);
2118 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1);
2124 mm_answer_jpake_key_confirm(int sock, Buffer *m)
2126 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2128 u_int x2_s_proof_len;
2131 fatal("%s: pctx == NULL", __func__);
2133 if ((pctx->a = BN_new()) == NULL)
2134 fatal("%s: BN_new", __func__);
2135 buffer_get_bignum2(m, pctx->a);
2136 x2_s_proof = buffer_get_string(m, &x2_s_proof_len);
2138 jpake_key_confirm(pctx->grp, pctx->s, pctx->a,
2139 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2,
2140 pctx->server_id, pctx->server_id_len,
2141 pctx->client_id, pctx->client_id_len,
2142 session_id2, session_id2_len,
2143 x2_s_proof, x2_s_proof_len,
2145 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len);
2147 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__));
2149 bzero(x2_s_proof, x2_s_proof_len);
2152 /* pctx->k is sensitive, not sent */
2153 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len);
2155 debug3("%s: sending confirmation hash", __func__);
2156 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m);
2158 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1);
2164 mm_answer_jpake_check_confirm(int sock, Buffer *m)
2166 int authenticated = 0;
2167 u_char *peer_confirm_hash;
2168 u_int peer_confirm_hash_len;
2169 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2172 fatal("%s: pctx == NULL", __func__);
2174 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len);
2176 authenticated = jpake_check_confirm(pctx->k,
2177 pctx->client_id, pctx->client_id_len,
2178 session_id2, session_id2_len,
2179 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid;
2181 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__));
2183 bzero(peer_confirm_hash, peer_confirm_hash_len);
2184 xfree(peer_confirm_hash);
2187 buffer_put_int(m, authenticated);
2189 debug3("%s: sending result %d", __func__, authenticated);
2190 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m);
2192 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1);
2194 auth_method = "jpake-01@openssh.com";
2195 return authenticated;