2 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
3 * Copyright 2002 Markus Friedl <markus@openbsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 RCSID("$OpenBSD: monitor.c,v 1.64 2005/10/13 22:24:31 stevesk Exp $");
31 #include <openssl/dh.h>
37 #define skeychallenge(k, u, c) opiechallenge((k), (u), (c))
38 #define skey_haskey(u) opie_haskey((u))
39 #define skey_passcheck(u, r) opie_passverify((u), (r))
49 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
52 #define TARGET_OS_MAC 1
57 #include "auth-options.h"
66 #include "monitor_mm.h"
67 #include "monitor_wrap.h"
68 #include "monitor_fdpass.h"
78 static Gssctxt *gsscontext = NULL;
82 extern ServerOptions options;
83 extern u_int utmp_len;
84 extern Newkeys *current_keys[];
85 extern z_stream incoming_stream;
86 extern z_stream outgoing_stream;
87 extern u_char session_id[];
88 extern Buffer input, output;
89 extern Buffer auth_debug;
90 extern int auth_debug_init;
91 extern Buffer loginmsg;
93 /* State exported from the child */
116 /* Functions on the monitor that answer unprivileged requests */
118 int mm_answer_moduli(int, Buffer *);
119 int mm_answer_sign(int, Buffer *);
120 int mm_answer_pwnamallow(int, Buffer *);
121 int mm_answer_auth2_read_banner(int, Buffer *);
122 int mm_answer_authserv(int, Buffer *);
123 int mm_answer_authpassword(int, Buffer *);
124 int mm_answer_bsdauthquery(int, Buffer *);
125 int mm_answer_bsdauthrespond(int, Buffer *);
126 int mm_answer_skeyquery(int, Buffer *);
127 int mm_answer_skeyrespond(int, Buffer *);
128 int mm_answer_keyallowed(int, Buffer *);
129 int mm_answer_keyverify(int, Buffer *);
130 int mm_answer_pty(int, Buffer *);
131 int mm_answer_pty_cleanup(int, Buffer *);
132 int mm_answer_term(int, Buffer *);
133 int mm_answer_rsa_keyallowed(int, Buffer *);
134 int mm_answer_rsa_challenge(int, Buffer *);
135 int mm_answer_rsa_response(int, Buffer *);
136 int mm_answer_sesskey(int, Buffer *);
137 int mm_answer_sessid(int, Buffer *);
140 int mm_answer_pam_start(int, Buffer *);
141 int mm_answer_pam_account(int, Buffer *);
142 int mm_answer_pam_init_ctx(int, Buffer *);
143 int mm_answer_pam_query(int, Buffer *);
144 int mm_answer_pam_respond(int, Buffer *);
145 int mm_answer_pam_free_ctx(int, Buffer *);
149 int mm_answer_gss_setup_ctx(int, Buffer *);
150 int mm_answer_gss_accept_ctx(int, Buffer *);
151 int mm_answer_gss_userok(int, Buffer *);
152 int mm_answer_gss_checkmic(int, Buffer *);
155 #ifdef SSH_AUDIT_EVENTS
156 int mm_answer_audit_event(int, Buffer *);
157 int mm_answer_audit_command(int, Buffer *);
160 static Authctxt *authctxt;
161 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
163 /* local state for key verify */
164 static u_char *key_blob = NULL;
165 static u_int key_bloblen = 0;
166 static int key_blobtype = MM_NOKEY;
167 static char *hostbased_cuser = NULL;
168 static char *hostbased_chost = NULL;
169 static char *auth_method = "unknown";
170 static u_int session_id2_len = 0;
171 static u_char *session_id2 = NULL;
172 static pid_t monitor_child_pid;
175 enum monitor_reqtype type;
177 int (*f)(int, Buffer *);
180 #define MON_ISAUTH 0x0004 /* Required for Authentication */
181 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
182 #define MON_ONCE 0x0010 /* Disable after calling */
184 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
186 #define MON_PERMIT 0x1000 /* Request is permitted */
188 struct mon_table mon_dispatch_proto20[] = {
189 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
190 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
191 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
192 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
193 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
194 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
196 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
197 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
198 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
199 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
200 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
201 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
203 #ifdef SSH_AUDIT_EVENTS
204 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
207 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
208 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
211 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
212 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
214 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
215 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
217 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
218 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
219 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
220 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
225 struct mon_table mon_dispatch_postauth20[] = {
226 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
227 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
228 {MONITOR_REQ_PTY, 0, mm_answer_pty},
229 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
230 {MONITOR_REQ_TERM, 0, mm_answer_term},
231 #ifdef SSH_AUDIT_EVENTS
232 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
233 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
238 struct mon_table mon_dispatch_proto15[] = {
239 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
240 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
241 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
242 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
243 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
244 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
245 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
246 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
248 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
249 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
252 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
253 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
256 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
257 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
258 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
259 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
260 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
261 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
263 #ifdef SSH_AUDIT_EVENTS
264 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
269 struct mon_table mon_dispatch_postauth15[] = {
270 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
271 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
272 {MONITOR_REQ_TERM, 0, mm_answer_term},
273 #ifdef SSH_AUDIT_EVENTS
274 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
275 {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command},
280 struct mon_table *mon_dispatch;
282 /* Specifies if a certain message is allowed at the moment */
285 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
287 while (ent->f != NULL) {
288 if (ent->type == type) {
289 ent->flags &= ~MON_PERMIT;
290 ent->flags |= permit ? MON_PERMIT : 0;
298 monitor_permit_authentications(int permit)
300 struct mon_table *ent = mon_dispatch;
302 while (ent->f != NULL) {
303 if (ent->flags & MON_AUTH) {
304 ent->flags &= ~MON_PERMIT;
305 ent->flags |= permit ? MON_PERMIT : 0;
312 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
314 struct mon_table *ent;
315 int authenticated = 0;
317 debug3("preauth child monitor started");
319 authctxt = _authctxt;
320 memset(authctxt, 0, sizeof(*authctxt));
322 authctxt->loginmsg = &loginmsg;
325 mon_dispatch = mon_dispatch_proto20;
327 /* Permit requests for moduli and signatures */
328 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
329 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
331 mon_dispatch = mon_dispatch_proto15;
333 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
336 /* The first few requests do not require asynchronous access */
337 while (!authenticated) {
338 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
340 if (!(ent->flags & MON_AUTHDECIDE))
341 fatal("%s: unexpected authentication from %d",
342 __func__, ent->type);
343 if (authctxt->pw->pw_uid == 0 &&
344 !auth_root_allowed(auth_method))
347 /* PAM needs to perform account checks after auth */
348 if (options.use_pam && authenticated) {
352 mm_request_receive_expect(pmonitor->m_sendfd,
353 MONITOR_REQ_PAM_ACCOUNT, &m);
354 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
360 if (ent->flags & MON_AUTHDECIDE) {
361 auth_log(authctxt, authenticated, auth_method,
362 compat20 ? " ssh2" : "");
364 authctxt->failures++;
368 if (!authctxt->valid)
369 fatal("%s: authenticated invalid user", __func__);
371 debug("%s: %s has been authenticated by privileged process",
372 __func__, authctxt->user);
374 mm_get_keystate(pmonitor);
378 monitor_set_child_handler(pid_t pid)
380 monitor_child_pid = pid;
384 monitor_child_handler(int sig)
386 kill(monitor_child_pid, sig);
390 monitor_child_postauth(struct monitor *pmonitor)
392 monitor_set_child_handler(pmonitor->m_pid);
393 signal(SIGHUP, &monitor_child_handler);
394 signal(SIGTERM, &monitor_child_handler);
397 mon_dispatch = mon_dispatch_postauth20;
399 /* Permit requests for moduli and signatures */
400 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
401 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
402 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
404 mon_dispatch = mon_dispatch_postauth15;
405 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
408 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
409 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
413 monitor_read(pmonitor, mon_dispatch, NULL);
417 monitor_sync(struct monitor *pmonitor)
419 if (options.compression) {
420 /* The member allocation is not visible, so sync it */
421 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
426 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
427 struct mon_table **pent)
435 mm_request_receive(pmonitor->m_sendfd, &m);
436 type = buffer_get_char(&m);
438 debug3("%s: checking request %d", __func__, type);
440 while (ent->f != NULL) {
441 if (ent->type == type)
446 if (ent->f != NULL) {
447 if (!(ent->flags & MON_PERMIT))
448 fatal("%s: unpermitted request %d", __func__,
450 ret = (*ent->f)(pmonitor->m_sendfd, &m);
453 /* The child may use this request only once, disable it */
454 if (ent->flags & MON_ONCE) {
455 debug2("%s: %d used once, disabling now", __func__,
457 ent->flags &= ~MON_PERMIT;
466 fatal("%s: unsupported request: %d", __func__, type);
472 /* allowed key state */
474 monitor_allowed_key(u_char *blob, u_int bloblen)
476 /* make sure key is allowed */
477 if (key_blob == NULL || key_bloblen != bloblen ||
478 memcmp(key_blob, blob, key_bloblen))
484 monitor_reset_key_state(void)
487 if (key_blob != NULL)
489 if (hostbased_cuser != NULL)
490 xfree(hostbased_cuser);
491 if (hostbased_chost != NULL)
492 xfree(hostbased_chost);
495 key_blobtype = MM_NOKEY;
496 hostbased_cuser = NULL;
497 hostbased_chost = NULL;
501 mm_answer_moduli(int sock, Buffer *m)
506 min = buffer_get_int(m);
507 want = buffer_get_int(m);
508 max = buffer_get_int(m);
510 debug3("%s: got parameters: %d %d %d",
511 __func__, min, want, max);
512 /* We need to check here, too, in case the child got corrupted */
513 if (max < min || want < min || max < want)
514 fatal("%s: bad parameters: %d %d %d",
515 __func__, min, want, max);
519 dh = choose_dh(min, want, max);
521 buffer_put_char(m, 0);
524 /* Send first bignum */
525 buffer_put_char(m, 1);
526 buffer_put_bignum2(m, dh->p);
527 buffer_put_bignum2(m, dh->g);
531 mm_request_send(sock, MONITOR_ANS_MODULI, m);
536 mm_answer_sign(int sock, Buffer *m)
541 u_int siglen, datlen;
544 debug3("%s", __func__);
546 keyid = buffer_get_int(m);
547 p = buffer_get_string(m, &datlen);
550 fatal("%s: data length incorrect: %u", __func__, datlen);
552 /* save session id, it will be passed on the first call */
553 if (session_id2_len == 0) {
554 session_id2_len = datlen;
555 session_id2 = xmalloc(session_id2_len);
556 memcpy(session_id2, p, session_id2_len);
559 if ((key = get_hostkey_by_index(keyid)) == NULL)
560 fatal("%s: no hostkey from index %d", __func__, keyid);
561 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
562 fatal("%s: key_sign failed", __func__);
564 debug3("%s: signature %p(%u)", __func__, signature, siglen);
567 buffer_put_string(m, signature, siglen);
572 mm_request_send(sock, MONITOR_ANS_SIGN, m);
574 /* Turn on permissions for getpwnam */
575 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
580 /* Retrieves the password entry and also checks if the user is permitted */
583 mm_answer_pwnamallow(int sock, Buffer *m)
586 struct passwd *pwent;
589 debug3("%s", __func__);
591 if (authctxt->attempt++ != 0)
592 fatal("%s: multiple attempts for getpwnam", __func__);
594 username = buffer_get_string(m, NULL);
596 pwent = getpwnamallow(username);
598 authctxt->user = xstrdup(username);
599 setproctitle("%s [priv]", pwent ? username : "unknown");
605 buffer_put_char(m, 0);
606 authctxt->pw = fakepw();
611 authctxt->pw = pwent;
614 buffer_put_char(m, 1);
615 buffer_put_string(m, pwent, sizeof(struct passwd));
616 buffer_put_cstring(m, pwent->pw_name);
617 buffer_put_cstring(m, "*");
618 buffer_put_cstring(m, pwent->pw_gecos);
619 #ifdef HAVE_PW_CLASS_IN_PASSWD
620 buffer_put_cstring(m, pwent->pw_class);
622 buffer_put_cstring(m, pwent->pw_dir);
623 buffer_put_cstring(m, pwent->pw_shell);
626 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
627 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
629 /* For SSHv1 allow authentication now */
631 monitor_permit_authentications(1);
633 /* Allow service/style information on the auth context */
634 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
635 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
640 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
642 #ifdef SSH_AUDIT_EVENTS
643 monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1);
649 int mm_answer_auth2_read_banner(int sock, Buffer *m)
654 banner = auth2_read_banner();
655 buffer_put_cstring(m, banner != NULL ? banner : "");
656 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
665 mm_answer_authserv(int sock, Buffer *m)
667 monitor_permit_authentications(1);
669 authctxt->service = buffer_get_string(m, NULL);
670 authctxt->style = buffer_get_string(m, NULL);
671 debug3("%s: service=%s, style=%s",
672 __func__, authctxt->service, authctxt->style);
674 if (strlen(authctxt->style) == 0) {
675 xfree(authctxt->style);
676 authctxt->style = NULL;
683 mm_answer_authpassword(int sock, Buffer *m)
685 static int call_count;
690 passwd = buffer_get_string(m, &plen);
691 /* Only authenticate if the context is valid */
692 authenticated = options.password_authentication &&
693 auth_password(authctxt, passwd);
694 memset(passwd, 0, strlen(passwd));
698 buffer_put_int(m, authenticated);
700 debug3("%s: sending result %d", __func__, authenticated);
701 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
704 if (plen == 0 && call_count == 1)
705 auth_method = "none";
707 auth_method = "password";
709 /* Causes monitor loop to terminate if authenticated */
710 return (authenticated);
715 mm_answer_bsdauthquery(int sock, Buffer *m)
717 char *name, *infotxt;
723 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
724 &prompts, &echo_on) < 0 ? 0 : 1;
727 buffer_put_int(m, success);
729 buffer_put_cstring(m, prompts[0]);
731 debug3("%s: sending challenge success: %u", __func__, success);
732 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
745 mm_answer_bsdauthrespond(int sock, Buffer *m)
750 if (authctxt->as == 0)
751 fatal("%s: no bsd auth session", __func__);
753 response = buffer_get_string(m, NULL);
754 authok = options.challenge_response_authentication &&
755 auth_userresponse(authctxt->as, response, 0);
757 debug3("%s: <%s> = <%d>", __func__, response, authok);
761 buffer_put_int(m, authok);
763 debug3("%s: sending authenticated: %d", __func__, authok);
764 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
766 auth_method = "bsdauth";
768 return (authok != 0);
774 mm_answer_skeyquery(int sock, Buffer *m)
777 char challenge[1024];
780 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
781 sizeof(challenge)) < 0 ? 0 : 1;
784 buffer_put_int(m, success);
786 buffer_put_cstring(m, challenge);
788 debug3("%s: sending challenge success: %u", __func__, success);
789 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
795 mm_answer_skeyrespond(int sock, Buffer *m)
800 response = buffer_get_string(m, NULL);
802 authok = (options.challenge_response_authentication &&
804 skey_haskey(authctxt->pw->pw_name) == 0 &&
805 skey_passcheck(authctxt->pw->pw_name, response) != -1);
810 buffer_put_int(m, authok);
812 debug3("%s: sending authenticated: %d", __func__, authok);
813 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
815 auth_method = "skey";
817 return (authok != 0);
823 mm_answer_pam_start(int sock, Buffer *m)
825 if (!options.use_pam)
826 fatal("UsePAM not set, but ended up in %s anyway", __func__);
830 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
836 mm_answer_pam_account(int sock, Buffer *m)
840 if (!options.use_pam)
841 fatal("UsePAM not set, but ended up in %s anyway", __func__);
843 ret = do_pam_account();
845 buffer_put_int(m, ret);
846 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
848 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
853 static void *sshpam_ctxt, *sshpam_authok;
854 extern KbdintDevice sshpam_device;
857 mm_answer_pam_init_ctx(int sock, Buffer *m)
860 debug3("%s", __func__);
861 authctxt->user = buffer_get_string(m, NULL);
862 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
863 sshpam_authok = NULL;
865 if (sshpam_ctxt != NULL) {
866 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
867 buffer_put_int(m, 1);
869 buffer_put_int(m, 0);
871 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
876 mm_answer_pam_query(int sock, Buffer *m)
878 char *name, *info, **prompts;
879 u_int i, num, *echo_on;
882 debug3("%s", __func__);
883 sshpam_authok = NULL;
884 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
885 if (ret == 0 && num == 0)
886 sshpam_authok = sshpam_ctxt;
887 if (num > 1 || name == NULL || info == NULL)
890 buffer_put_int(m, ret);
891 buffer_put_cstring(m, name);
893 buffer_put_cstring(m, info);
895 buffer_put_int(m, num);
896 for (i = 0; i < num; ++i) {
897 buffer_put_cstring(m, prompts[i]);
899 buffer_put_int(m, echo_on[i]);
905 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
910 mm_answer_pam_respond(int sock, Buffer *m)
916 debug3("%s", __func__);
917 sshpam_authok = NULL;
918 num = buffer_get_int(m);
920 resp = xmalloc(num * sizeof(char *));
921 for (i = 0; i < num; ++i)
922 resp[i] = buffer_get_string(m, NULL);
923 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
924 for (i = 0; i < num; ++i)
928 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
931 buffer_put_int(m, ret);
932 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
933 auth_method = "keyboard-interactive/pam";
935 sshpam_authok = sshpam_ctxt;
940 mm_answer_pam_free_ctx(int sock, Buffer *m)
943 debug3("%s", __func__);
944 (sshpam_device.free_ctx)(sshpam_ctxt);
946 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
947 return (sshpam_authok == sshpam_ctxt);
952 mm_append_debug(Buffer *m)
954 if (auth_debug_init && buffer_len(&auth_debug)) {
955 debug3("%s: Appending debug messages for child", __func__);
956 buffer_append(m, buffer_ptr(&auth_debug),
957 buffer_len(&auth_debug));
958 buffer_clear(&auth_debug);
963 mm_answer_keyallowed(int sock, Buffer *m)
969 enum mm_keytype type = 0;
972 debug3("%s entering", __func__);
974 type = buffer_get_int(m);
975 cuser = buffer_get_string(m, NULL);
976 chost = buffer_get_string(m, NULL);
977 blob = buffer_get_string(m, &bloblen);
979 key = key_from_blob(blob, bloblen);
981 if ((compat20 && type == MM_RSAHOSTKEY) ||
982 (!compat20 && type != MM_RSAHOSTKEY))
983 fatal("%s: key type and protocol mismatch", __func__);
985 debug3("%s: key_from_blob: %p", __func__, key);
987 if (key != NULL && authctxt->valid) {
990 allowed = options.pubkey_authentication &&
991 user_key_allowed(authctxt->pw, key);
994 allowed = options.hostbased_authentication &&
995 hostbased_key_allowed(authctxt->pw,
999 key->type = KEY_RSA1; /* XXX */
1000 allowed = options.rhosts_rsa_authentication &&
1001 auth_rhosts_rsa_key_allowed(authctxt->pw,
1005 fatal("%s: unknown key type %d", __func__, type);
1012 /* clear temporarily storage (used by verify) */
1013 monitor_reset_key_state();
1016 /* Save temporarily for comparison in verify */
1018 key_bloblen = bloblen;
1019 key_blobtype = type;
1020 hostbased_cuser = cuser;
1021 hostbased_chost = chost;
1024 debug3("%s: key %p is %s",
1025 __func__, key, allowed ? "allowed" : "disallowed");
1028 buffer_put_int(m, allowed);
1029 buffer_put_int(m, forced_command != NULL);
1033 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1035 if (type == MM_RSAHOSTKEY)
1036 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1042 monitor_valid_userblob(u_char *data, u_int datalen)
1050 buffer_append(&b, data, datalen);
1052 if (datafellows & SSH_OLD_SESSIONID) {
1054 len = buffer_len(&b);
1055 if ((session_id2 == NULL) ||
1056 (len < session_id2_len) ||
1057 (memcmp(p, session_id2, session_id2_len) != 0))
1059 buffer_consume(&b, session_id2_len);
1061 p = buffer_get_string(&b, &len);
1062 if ((session_id2 == NULL) ||
1063 (len != session_id2_len) ||
1064 (memcmp(p, session_id2, session_id2_len) != 0))
1068 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1070 p = buffer_get_string(&b, NULL);
1071 if (strcmp(authctxt->user, p) != 0) {
1072 logit("wrong user name passed to monitor: expected %s != %.100s",
1077 buffer_skip_string(&b);
1078 if (datafellows & SSH_BUG_PKAUTH) {
1079 if (!buffer_get_char(&b))
1082 p = buffer_get_string(&b, NULL);
1083 if (strcmp("publickey", p) != 0)
1086 if (!buffer_get_char(&b))
1088 buffer_skip_string(&b);
1090 buffer_skip_string(&b);
1091 if (buffer_len(&b) != 0)
1098 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1107 buffer_append(&b, data, datalen);
1109 p = buffer_get_string(&b, &len);
1110 if ((session_id2 == NULL) ||
1111 (len != session_id2_len) ||
1112 (memcmp(p, session_id2, session_id2_len) != 0))
1116 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1118 p = buffer_get_string(&b, NULL);
1119 if (strcmp(authctxt->user, p) != 0) {
1120 logit("wrong user name passed to monitor: expected %s != %.100s",
1125 buffer_skip_string(&b); /* service */
1126 p = buffer_get_string(&b, NULL);
1127 if (strcmp(p, "hostbased") != 0)
1130 buffer_skip_string(&b); /* pkalg */
1131 buffer_skip_string(&b); /* pkblob */
1133 /* verify client host, strip trailing dot if necessary */
1134 p = buffer_get_string(&b, NULL);
1135 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1137 if (strcmp(p, chost) != 0)
1141 /* verify client user */
1142 p = buffer_get_string(&b, NULL);
1143 if (strcmp(p, cuser) != 0)
1147 if (buffer_len(&b) != 0)
1154 mm_answer_keyverify(int sock, Buffer *m)
1157 u_char *signature, *data, *blob;
1158 u_int signaturelen, datalen, bloblen;
1162 blob = buffer_get_string(m, &bloblen);
1163 signature = buffer_get_string(m, &signaturelen);
1164 data = buffer_get_string(m, &datalen);
1166 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1167 !monitor_allowed_key(blob, bloblen))
1168 fatal("%s: bad key, not previously allowed", __func__);
1170 key = key_from_blob(blob, bloblen);
1172 fatal("%s: bad public key blob", __func__);
1174 switch (key_blobtype) {
1176 valid_data = monitor_valid_userblob(data, datalen);
1179 valid_data = monitor_valid_hostbasedblob(data, datalen,
1180 hostbased_cuser, hostbased_chost);
1187 fatal("%s: bad signature data blob", __func__);
1189 verified = key_verify(key, signature, signaturelen, data, datalen);
1190 debug3("%s: key %p signature %s",
1191 __func__, key, verified ? "verified" : "unverified");
1198 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1200 monitor_reset_key_state();
1203 buffer_put_int(m, verified);
1204 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1210 mm_record_login(Session *s, struct passwd *pw)
1213 struct sockaddr_storage from;
1216 * Get IP address of client. If the connection is not a socket, let
1217 * the address be 0.0.0.0.
1219 memset(&from, 0, sizeof(from));
1220 fromlen = sizeof(from);
1221 if (packet_connection_is_on_socket()) {
1222 if (getpeername(packet_get_connection_in(),
1223 (struct sockaddr *) & from, &fromlen) < 0) {
1224 debug("getpeername: %.100s", strerror(errno));
1228 /* Record that there was a login on that tty from the remote host. */
1229 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1230 get_remote_name_or_ip(utmp_len, options.use_dns),
1231 (struct sockaddr *)&from, fromlen);
1235 mm_session_close(Session *s)
1237 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1238 if (s->ttyfd != -1) {
1239 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1240 session_pty_cleanup2(s);
1246 mm_answer_pty(int sock, Buffer *m)
1248 extern struct monitor *pmonitor;
1252 debug3("%s entering", __func__);
1258 s->authctxt = authctxt;
1259 s->pw = authctxt->pw;
1260 s->pid = pmonitor->m_pid;
1261 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1264 pty_setowner(authctxt->pw, s->tty);
1266 buffer_put_int(m, 1);
1267 buffer_put_cstring(m, s->tty);
1269 /* We need to trick ttyslot */
1270 if (dup2(s->ttyfd, 0) == -1)
1271 fatal("%s: dup2", __func__);
1273 mm_record_login(s, authctxt->pw);
1275 /* Now we can close the file descriptor again */
1278 /* send messages generated by record_login */
1279 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1280 buffer_clear(&loginmsg);
1282 mm_request_send(sock, MONITOR_ANS_PTY, m);
1284 mm_send_fd(sock, s->ptyfd);
1285 mm_send_fd(sock, s->ttyfd);
1287 /* make sure nothing uses fd 0 */
1288 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1289 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1291 error("%s: fd0 %d != 0", __func__, fd0);
1293 /* slave is not needed */
1295 s->ttyfd = s->ptyfd;
1296 /* no need to dup() because nobody closes ptyfd */
1297 s->ptymaster = s->ptyfd;
1299 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1305 mm_session_close(s);
1306 buffer_put_int(m, 0);
1307 mm_request_send(sock, MONITOR_ANS_PTY, m);
1312 mm_answer_pty_cleanup(int sock, Buffer *m)
1317 debug3("%s entering", __func__);
1319 tty = buffer_get_string(m, NULL);
1320 if ((s = session_by_tty(tty)) != NULL)
1321 mm_session_close(s);
1328 mm_answer_sesskey(int sock, Buffer *m)
1333 /* Turn off permissions */
1334 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1336 if ((p = BN_new()) == NULL)
1337 fatal("%s: BN_new", __func__);
1339 buffer_get_bignum2(m, p);
1341 rsafail = ssh1_session_key(p);
1344 buffer_put_int(m, rsafail);
1345 buffer_put_bignum2(m, p);
1349 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1351 /* Turn on permissions for sessid passing */
1352 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1358 mm_answer_sessid(int sock, Buffer *m)
1362 debug3("%s entering", __func__);
1364 if (buffer_len(m) != 16)
1365 fatal("%s: bad ssh1 session id", __func__);
1366 for (i = 0; i < 16; i++)
1367 session_id[i] = buffer_get_char(m);
1369 /* Turn on permissions for getpwnam */
1370 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1376 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1380 u_char *blob = NULL;
1384 debug3("%s entering", __func__);
1386 if (options.rsa_authentication && authctxt->valid) {
1387 if ((client_n = BN_new()) == NULL)
1388 fatal("%s: BN_new", __func__);
1389 buffer_get_bignum2(m, client_n);
1390 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1391 BN_clear_free(client_n);
1394 buffer_put_int(m, allowed);
1395 buffer_put_int(m, forced_command != NULL);
1397 /* clear temporarily storage (used by generate challenge) */
1398 monitor_reset_key_state();
1400 if (allowed && key != NULL) {
1401 key->type = KEY_RSA; /* cheat for key_to_blob */
1402 if (key_to_blob(key, &blob, &blen) == 0)
1403 fatal("%s: key_to_blob failed", __func__);
1404 buffer_put_string(m, blob, blen);
1406 /* Save temporarily for comparison in verify */
1409 key_blobtype = MM_RSAUSERKEY;
1416 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1418 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1419 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1424 mm_answer_rsa_challenge(int sock, Buffer *m)
1430 debug3("%s entering", __func__);
1432 if (!authctxt->valid)
1433 fatal("%s: authctxt not valid", __func__);
1434 blob = buffer_get_string(m, &blen);
1435 if (!monitor_allowed_key(blob, blen))
1436 fatal("%s: bad key, not previously allowed", __func__);
1437 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1438 fatal("%s: key type mismatch", __func__);
1439 if ((key = key_from_blob(blob, blen)) == NULL)
1440 fatal("%s: received bad key", __func__);
1443 BN_clear_free(ssh1_challenge);
1444 ssh1_challenge = auth_rsa_generate_challenge(key);
1447 buffer_put_bignum2(m, ssh1_challenge);
1449 debug3("%s sending reply", __func__);
1450 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1452 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1460 mm_answer_rsa_response(int sock, Buffer *m)
1463 u_char *blob, *response;
1467 debug3("%s entering", __func__);
1469 if (!authctxt->valid)
1470 fatal("%s: authctxt not valid", __func__);
1471 if (ssh1_challenge == NULL)
1472 fatal("%s: no ssh1_challenge", __func__);
1474 blob = buffer_get_string(m, &blen);
1475 if (!monitor_allowed_key(blob, blen))
1476 fatal("%s: bad key, not previously allowed", __func__);
1477 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1478 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1479 if ((key = key_from_blob(blob, blen)) == NULL)
1480 fatal("%s: received bad key", __func__);
1481 response = buffer_get_string(m, &len);
1483 fatal("%s: received bad response to challenge", __func__);
1484 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1490 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1493 BN_clear_free(ssh1_challenge);
1494 ssh1_challenge = NULL;
1495 monitor_reset_key_state();
1498 buffer_put_int(m, success);
1499 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1505 mm_answer_term(int sock, Buffer *req)
1507 extern struct monitor *pmonitor;
1510 debug3("%s: tearing down sessions", __func__);
1512 /* The child is terminating */
1513 session_destroy_all(&mm_session_close);
1515 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1519 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1521 /* Terminate process */
1525 #ifdef SSH_AUDIT_EVENTS
1526 /* Report that an audit event occurred */
1528 mm_answer_audit_event(int socket, Buffer *m)
1530 ssh_audit_event_t event;
1532 debug3("%s entering", __func__);
1534 event = buffer_get_int(m);
1536 case SSH_AUTH_FAIL_PUBKEY:
1537 case SSH_AUTH_FAIL_HOSTBASED:
1538 case SSH_AUTH_FAIL_GSSAPI:
1539 case SSH_LOGIN_EXCEED_MAXTRIES:
1540 case SSH_LOGIN_ROOT_DENIED:
1541 case SSH_CONNECTION_CLOSE:
1542 case SSH_INVALID_USER:
1546 fatal("Audit event type %d not permitted", event);
1553 mm_answer_audit_command(int socket, Buffer *m)
1558 debug3("%s entering", __func__);
1559 cmd = buffer_get_string(m, &len);
1560 /* sanity check command, if so how? */
1561 audit_run_command(cmd);
1565 #endif /* SSH_AUDIT_EVENTS */
1568 monitor_apply_keystate(struct monitor *pmonitor)
1571 set_newkeys(MODE_IN);
1572 set_newkeys(MODE_OUT);
1574 packet_set_protocol_flags(child_state.ssh1protoflags);
1575 packet_set_encryption_key(child_state.ssh1key,
1576 child_state.ssh1keylen, child_state.ssh1cipher);
1577 xfree(child_state.ssh1key);
1580 /* for rc4 and other stateful ciphers */
1581 packet_set_keycontext(MODE_OUT, child_state.keyout);
1582 xfree(child_state.keyout);
1583 packet_set_keycontext(MODE_IN, child_state.keyin);
1584 xfree(child_state.keyin);
1587 packet_set_iv(MODE_OUT, child_state.ivout);
1588 xfree(child_state.ivout);
1589 packet_set_iv(MODE_IN, child_state.ivin);
1590 xfree(child_state.ivin);
1593 memcpy(&incoming_stream, &child_state.incoming,
1594 sizeof(incoming_stream));
1595 memcpy(&outgoing_stream, &child_state.outgoing,
1596 sizeof(outgoing_stream));
1598 /* Update with new address */
1599 if (options.compression)
1600 mm_init_compression(pmonitor->m_zlib);
1602 /* Network I/O buffers */
1603 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1604 buffer_clear(&input);
1605 buffer_append(&input, child_state.input, child_state.ilen);
1606 memset(child_state.input, 0, child_state.ilen);
1607 xfree(child_state.input);
1609 buffer_clear(&output);
1610 buffer_append(&output, child_state.output, child_state.olen);
1611 memset(child_state.output, 0, child_state.olen);
1612 xfree(child_state.output);
1616 mm_get_kex(Buffer *m)
1622 kex = xmalloc(sizeof(*kex));
1623 memset(kex, 0, sizeof(*kex));
1624 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1625 if ((session_id2 == NULL) ||
1626 (kex->session_id_len != session_id2_len) ||
1627 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1628 fatal("mm_get_get: internal error: bad session id");
1629 kex->we_need = buffer_get_int(m);
1630 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1631 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1632 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1634 kex->hostkey_type = buffer_get_int(m);
1635 kex->kex_type = buffer_get_int(m);
1636 blob = buffer_get_string(m, &bloblen);
1637 buffer_init(&kex->my);
1638 buffer_append(&kex->my, blob, bloblen);
1640 blob = buffer_get_string(m, &bloblen);
1641 buffer_init(&kex->peer);
1642 buffer_append(&kex->peer, blob, bloblen);
1645 kex->flags = buffer_get_int(m);
1646 kex->client_version_string = buffer_get_string(m, NULL);
1647 kex->server_version_string = buffer_get_string(m, NULL);
1648 kex->load_host_key=&get_hostkey_by_type;
1649 kex->host_key_index=&get_hostkey_index;
1654 /* This function requries careful sanity checking */
1657 mm_get_keystate(struct monitor *pmonitor)
1661 u_int bloblen, plen;
1662 u_int32_t seqnr, packets;
1665 debug3("%s: Waiting for new keys", __func__);
1668 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1670 child_state.ssh1protoflags = buffer_get_int(&m);
1671 child_state.ssh1cipher = buffer_get_int(&m);
1672 child_state.ssh1key = buffer_get_string(&m,
1673 &child_state.ssh1keylen);
1674 child_state.ivout = buffer_get_string(&m,
1675 &child_state.ivoutlen);
1676 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1679 /* Get the Kex for rekeying */
1680 *pmonitor->m_pkex = mm_get_kex(&m);
1683 blob = buffer_get_string(&m, &bloblen);
1684 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1687 debug3("%s: Waiting for second key", __func__);
1688 blob = buffer_get_string(&m, &bloblen);
1689 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1692 /* Now get sequence numbers for the packets */
1693 seqnr = buffer_get_int(&m);
1694 blocks = buffer_get_int64(&m);
1695 packets = buffer_get_int(&m);
1696 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1697 seqnr = buffer_get_int(&m);
1698 blocks = buffer_get_int64(&m);
1699 packets = buffer_get_int(&m);
1700 packet_set_state(MODE_IN, seqnr, blocks, packets);
1703 /* Get the key context */
1704 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1705 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1707 debug3("%s: Getting compression state", __func__);
1708 /* Get compression state */
1709 p = buffer_get_string(&m, &plen);
1710 if (plen != sizeof(child_state.outgoing))
1711 fatal("%s: bad request size", __func__);
1712 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1715 p = buffer_get_string(&m, &plen);
1716 if (plen != sizeof(child_state.incoming))
1717 fatal("%s: bad request size", __func__);
1718 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1721 /* Network I/O buffers */
1722 debug3("%s: Getting Network I/O buffers", __func__);
1723 child_state.input = buffer_get_string(&m, &child_state.ilen);
1724 child_state.output = buffer_get_string(&m, &child_state.olen);
1730 /* Allocation functions for zlib */
1732 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1734 size_t len = (size_t) size * ncount;
1737 if (len == 0 || ncount > SIZE_T_MAX / size)
1738 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1740 address = mm_malloc(mm, len);
1746 mm_zfree(struct mm_master *mm, void *address)
1748 mm_free(mm, address);
1752 mm_init_compression(struct mm_master *mm)
1754 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1755 outgoing_stream.zfree = (free_func)mm_zfree;
1756 outgoing_stream.opaque = mm;
1758 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1759 incoming_stream.zfree = (free_func)mm_zfree;
1760 incoming_stream.opaque = mm;
1765 #define FD_CLOSEONEXEC(x) do { \
1766 if (fcntl(x, F_SETFD, 1) == -1) \
1767 fatal("fcntl(%d, F_SETFD)", x); \
1771 monitor_socketpair(int *pair)
1773 #ifdef HAVE_SOCKETPAIR
1774 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1775 fatal("%s: socketpair", __func__);
1777 fatal("%s: UsePrivilegeSeparation=yes not supported",
1780 FD_CLOSEONEXEC(pair[0]);
1781 FD_CLOSEONEXEC(pair[1]);
1784 #define MM_MEMSIZE 65536
1789 struct monitor *mon;
1792 mon = xmalloc(sizeof(*mon));
1795 monitor_socketpair(pair);
1797 mon->m_recvfd = pair[0];
1798 mon->m_sendfd = pair[1];
1800 /* Used to share zlib space across processes */
1801 if (options.compression) {
1802 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1803 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1805 /* Compression needs to share state across borders */
1806 mm_init_compression(mon->m_zlib);
1813 monitor_reinit(struct monitor *mon)
1817 monitor_socketpair(pair);
1819 mon->m_recvfd = pair[0];
1820 mon->m_sendfd = pair[1];
1825 mm_answer_gss_setup_ctx(int sock, Buffer *m)
1831 goid.elements = buffer_get_string(m, &len);
1834 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1836 xfree(goid.elements);
1839 buffer_put_int(m, major);
1841 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1843 /* Now we have a context, enable the step */
1844 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1850 mm_answer_gss_accept_ctx(int sock, Buffer *m)
1853 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1854 OM_uint32 major, minor;
1855 OM_uint32 flags = 0; /* GSI needs this */
1858 in.value = buffer_get_string(m, &len);
1860 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1864 buffer_put_int(m, major);
1865 buffer_put_string(m, out.value, out.length);
1866 buffer_put_int(m, flags);
1867 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1869 gss_release_buffer(&minor, &out);
1871 if (major == GSS_S_COMPLETE) {
1872 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1873 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1874 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1880 mm_answer_gss_checkmic(int sock, Buffer *m)
1882 gss_buffer_desc gssbuf, mic;
1886 gssbuf.value = buffer_get_string(m, &len);
1887 gssbuf.length = len;
1888 mic.value = buffer_get_string(m, &len);
1891 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1893 xfree(gssbuf.value);
1897 buffer_put_int(m, ret);
1899 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1901 if (!GSS_ERROR(ret))
1902 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1908 mm_answer_gss_userok(int sock, Buffer *m)
1912 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1915 buffer_put_int(m, authenticated);
1917 debug3("%s: sending result %d", __func__, authenticated);
1918 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1920 auth_method = "gssapi-with-mic";
1922 /* Monitor loop will terminate if authenticated */
1923 return (authenticated);