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 1.63 2005/03/10 22:01:05 deraadt Exp $");
30 #include <openssl/dh.h>
40 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
43 #define TARGET_OS_MAC 1
48 #include "auth-options.h"
57 #include "monitor_mm.h"
58 #include "monitor_wrap.h"
59 #include "monitor_fdpass.h"
69 static Gssctxt *gsscontext = NULL;
73 extern ServerOptions options;
74 extern u_int utmp_len;
75 extern Newkeys *current_keys[];
76 extern z_stream incoming_stream;
77 extern z_stream outgoing_stream;
78 extern u_char session_id[];
79 extern Buffer input, output;
80 extern Buffer auth_debug;
81 extern int auth_debug_init;
82 extern Buffer loginmsg;
84 /* State exported from the child */
107 /* Functions on the monitor that answer unprivileged requests */
109 int mm_answer_moduli(int, Buffer *);
110 int mm_answer_sign(int, Buffer *);
111 int mm_answer_pwnamallow(int, Buffer *);
112 int mm_answer_auth2_read_banner(int, Buffer *);
113 int mm_answer_authserv(int, Buffer *);
114 int mm_answer_authpassword(int, Buffer *);
115 int mm_answer_bsdauthquery(int, Buffer *);
116 int mm_answer_bsdauthrespond(int, Buffer *);
117 int mm_answer_skeyquery(int, Buffer *);
118 int mm_answer_skeyrespond(int, Buffer *);
119 int mm_answer_keyallowed(int, Buffer *);
120 int mm_answer_keyverify(int, Buffer *);
121 int mm_answer_pty(int, Buffer *);
122 int mm_answer_pty_cleanup(int, Buffer *);
123 int mm_answer_term(int, Buffer *);
124 int mm_answer_rsa_keyallowed(int, Buffer *);
125 int mm_answer_rsa_challenge(int, Buffer *);
126 int mm_answer_rsa_response(int, Buffer *);
127 int mm_answer_sesskey(int, Buffer *);
128 int mm_answer_sessid(int, Buffer *);
131 int mm_answer_pam_start(int, Buffer *);
132 int mm_answer_pam_account(int, Buffer *);
133 int mm_answer_pam_init_ctx(int, Buffer *);
134 int mm_answer_pam_query(int, Buffer *);
135 int mm_answer_pam_respond(int, Buffer *);
136 int mm_answer_pam_free_ctx(int, Buffer *);
140 int mm_answer_gss_setup_ctx(int, Buffer *);
141 int mm_answer_gss_accept_ctx(int, Buffer *);
142 int mm_answer_gss_userok(int, Buffer *);
143 int mm_answer_gss_checkmic(int, Buffer *);
147 int mm_answer_gss_setup_ctx(int, Buffer *);
148 int mm_answer_gss_accept_ctx(int, Buffer *);
149 int mm_answer_gss_userok(int, Buffer *);
150 int mm_answer_gss_sign(int, Buffer *);
151 int mm_answer_gss_error(int, Buffer *);
152 int mm_answer_gss_indicate_mechs(int, Buffer *);
153 int mm_answer_gss_localname(int, Buffer *);
156 #ifdef SSH_AUDIT_EVENTS
157 int mm_answer_audit_event(int, Buffer *);
158 int mm_answer_audit_command(int, Buffer *);
161 static Authctxt *authctxt;
162 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
164 /* local state for key verify */
165 static u_char *key_blob = NULL;
166 static u_int key_bloblen = 0;
167 static int key_blobtype = MM_NOKEY;
168 static char *hostbased_cuser = NULL;
169 static char *hostbased_chost = NULL;
170 static char *auth_method = "unknown";
171 static u_int session_id2_len = 0;
172 static u_char *session_id2 = NULL;
173 static pid_t monitor_child_pid;
176 enum monitor_reqtype type;
178 int (*f)(int, Buffer *);
181 #define MON_ISAUTH 0x0004 /* Required for Authentication */
182 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
183 #define MON_ONCE 0x0010 /* Disable after calling */
185 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
187 #define MON_PERMIT 0x1000 /* Request is permitted */
189 struct mon_table mon_dispatch_proto20[] = {
190 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
191 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
192 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
193 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
194 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
195 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
197 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
198 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
199 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
200 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
201 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
202 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
204 #ifdef SSH_AUDIT_EVENTS
205 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
208 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
209 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
212 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
213 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
215 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
216 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
218 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
219 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
220 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
221 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
222 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
223 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
224 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
225 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
230 struct mon_table mon_dispatch_postauth20[] = {
232 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
233 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
234 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
235 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
236 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
238 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
239 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
240 {MONITOR_REQ_PTY, 0, mm_answer_pty},
241 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
242 {MONITOR_REQ_TERM, 0, mm_answer_term},
243 #ifdef SSH_AUDIT_EVENTS
244 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
245 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
250 struct mon_table mon_dispatch_proto15[] = {
251 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
252 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
253 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
254 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
255 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
256 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
257 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
258 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
260 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
261 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
264 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
265 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
268 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
269 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
270 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
271 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
272 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
275 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
276 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
277 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
278 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
279 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
280 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
282 #ifdef SSH_AUDIT_EVENTS
283 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
288 struct mon_table mon_dispatch_postauth15[] = {
289 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
290 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
291 {MONITOR_REQ_TERM, 0, mm_answer_term},
292 #ifdef SSH_AUDIT_EVENTS
293 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
294 {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command},
299 struct mon_table *mon_dispatch;
301 /* Specifies if a certain message is allowed at the moment */
304 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
306 while (ent->f != NULL) {
307 if (ent->type == type) {
308 ent->flags &= ~MON_PERMIT;
309 ent->flags |= permit ? MON_PERMIT : 0;
317 monitor_permit_authentications(int permit)
319 struct mon_table *ent = mon_dispatch;
321 while (ent->f != NULL) {
322 if (ent->flags & MON_AUTH) {
323 ent->flags &= ~MON_PERMIT;
324 ent->flags |= permit ? MON_PERMIT : 0;
331 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
333 struct mon_table *ent;
334 int authenticated = 0;
336 debug3("preauth child monitor started");
338 authctxt = _authctxt;
339 memset(authctxt, 0, sizeof(*authctxt));
341 authctxt->loginmsg = &loginmsg;
344 mon_dispatch = mon_dispatch_proto20;
346 /* Permit requests for moduli and signatures */
347 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
348 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
350 /* and for the GSSAPI key exchange */
351 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
352 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
353 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
356 mon_dispatch = mon_dispatch_proto15;
358 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
361 /* The first few requests do not require asynchronous access */
362 while (!authenticated) {
363 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
365 if (!(ent->flags & MON_AUTHDECIDE))
366 fatal("%s: unexpected authentication from %d",
367 __func__, ent->type);
368 if (authctxt->pw->pw_uid == 0 &&
369 !auth_root_allowed(auth_method))
372 /* PAM needs to perform account checks after auth */
373 if (options.use_pam && authenticated) {
377 mm_request_receive_expect(pmonitor->m_sendfd,
378 MONITOR_REQ_PAM_ACCOUNT, &m);
379 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
385 if (ent->flags & MON_AUTHDECIDE) {
386 auth_log(authctxt, authenticated, auth_method,
387 compat20 ? " ssh2" : "");
389 authctxt->failures++;
393 if (!authctxt->valid)
394 fatal("%s: authenticated invalid user", __func__);
396 debug("%s: %s has been authenticated by privileged process",
397 __func__, authctxt->user);
399 mm_get_keystate(pmonitor);
403 monitor_set_child_handler(pid_t pid)
405 monitor_child_pid = pid;
409 monitor_child_handler(int sig)
411 kill(monitor_child_pid, sig);
415 monitor_child_postauth(struct monitor *pmonitor)
417 monitor_set_child_handler(pmonitor->m_pid);
418 signal(SIGHUP, &monitor_child_handler);
419 signal(SIGTERM, &monitor_child_handler);
422 mon_dispatch = mon_dispatch_postauth20;
424 /* Permit requests for moduli and signatures */
425 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
426 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
427 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
430 /* and for the GSSAPI key exchange */
431 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
432 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
433 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
437 mon_dispatch = mon_dispatch_postauth15;
438 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
441 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
444 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
445 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
449 monitor_read(pmonitor, mon_dispatch, NULL);
453 monitor_sync(struct monitor *pmonitor)
455 if (options.compression) {
456 /* The member allocation is not visible, so sync it */
457 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
462 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
463 struct mon_table **pent)
471 mm_request_receive(pmonitor->m_sendfd, &m);
472 type = buffer_get_char(&m);
474 debug3("%s: checking request %d", __func__, type);
476 while (ent->f != NULL) {
477 if (ent->type == type)
482 if (ent->f != NULL) {
483 if (!(ent->flags & MON_PERMIT))
484 fatal("%s: unpermitted request %d", __func__,
486 ret = (*ent->f)(pmonitor->m_sendfd, &m);
489 /* The child may use this request only once, disable it */
490 if (ent->flags & MON_ONCE) {
491 debug2("%s: %d used once, disabling now", __func__,
493 ent->flags &= ~MON_PERMIT;
502 fatal("%s: unsupported request: %d", __func__, type);
508 /* allowed key state */
510 monitor_allowed_key(u_char *blob, u_int bloblen)
512 /* make sure key is allowed */
513 if (key_blob == NULL || key_bloblen != bloblen ||
514 memcmp(key_blob, blob, key_bloblen))
520 monitor_reset_key_state(void)
523 if (key_blob != NULL)
525 if (hostbased_cuser != NULL)
526 xfree(hostbased_cuser);
527 if (hostbased_chost != NULL)
528 xfree(hostbased_chost);
531 key_blobtype = MM_NOKEY;
532 hostbased_cuser = NULL;
533 hostbased_chost = NULL;
537 mm_answer_moduli(int sock, Buffer *m)
542 min = buffer_get_int(m);
543 want = buffer_get_int(m);
544 max = buffer_get_int(m);
546 debug3("%s: got parameters: %d %d %d",
547 __func__, min, want, max);
548 /* We need to check here, too, in case the child got corrupted */
549 if (max < min || want < min || max < want)
550 fatal("%s: bad parameters: %d %d %d",
551 __func__, min, want, max);
555 dh = choose_dh(min, want, max);
557 buffer_put_char(m, 0);
560 /* Send first bignum */
561 buffer_put_char(m, 1);
562 buffer_put_bignum2(m, dh->p);
563 buffer_put_bignum2(m, dh->g);
567 mm_request_send(sock, MONITOR_ANS_MODULI, m);
572 mm_answer_sign(int sock, Buffer *m)
577 u_int siglen, datlen;
580 debug3("%s", __func__);
582 keyid = buffer_get_int(m);
583 p = buffer_get_string(m, &datlen);
586 fatal("%s: data length incorrect: %u", __func__, datlen);
588 /* save session id, it will be passed on the first call */
589 if (session_id2_len == 0) {
590 session_id2_len = datlen;
591 session_id2 = xmalloc(session_id2_len);
592 memcpy(session_id2, p, session_id2_len);
595 if ((key = get_hostkey_by_index(keyid)) == NULL)
596 fatal("%s: no hostkey from index %d", __func__, keyid);
597 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
598 fatal("%s: key_sign failed", __func__);
600 debug3("%s: signature %p(%u)", __func__, signature, siglen);
603 buffer_put_string(m, signature, siglen);
608 mm_request_send(sock, MONITOR_ANS_SIGN, m);
610 /* Turn on permissions for getpwnam */
611 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
616 /* Retrieves the password entry and also checks if the user is permitted */
619 mm_answer_pwnamallow(int sock, Buffer *m)
622 struct passwd *pwent;
625 debug3("%s", __func__);
627 username = buffer_get_string(m, NULL);
629 pwent = getpwnamallow(username);
631 if (authctxt->user) xfree(authctxt->user);
632 authctxt->user = xstrdup(username);
633 setproctitle("%s [priv]", pwent ? username : "unknown");
639 buffer_put_char(m, 0);
640 authctxt->pw = fakepw();
645 authctxt->pw = pwent;
648 buffer_put_char(m, 1);
649 buffer_put_string(m, pwent, sizeof(struct passwd));
650 buffer_put_cstring(m, pwent->pw_name);
651 buffer_put_cstring(m, "*");
652 buffer_put_cstring(m, pwent->pw_gecos);
653 #ifdef HAVE_PW_CLASS_IN_PASSWD
654 buffer_put_cstring(m, pwent->pw_class);
656 buffer_put_cstring(m, pwent->pw_dir);
657 buffer_put_cstring(m, pwent->pw_shell);
660 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
661 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
663 /* For SSHv1 allow authentication now */
665 monitor_permit_authentications(1);
667 /* Allow service/style information on the auth context */
668 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
669 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
674 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
676 #ifdef SSH_AUDIT_EVENTS
677 monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1);
683 int mm_answer_auth2_read_banner(int sock, Buffer *m)
688 banner = auth2_read_banner();
689 buffer_put_cstring(m, banner != NULL ? banner : "");
690 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
699 mm_answer_authserv(int sock, Buffer *m)
701 monitor_permit_authentications(1);
703 authctxt->service = buffer_get_string(m, NULL);
704 authctxt->style = buffer_get_string(m, NULL);
705 debug3("%s: service=%s, style=%s",
706 __func__, authctxt->service, authctxt->style);
708 if (strlen(authctxt->style) == 0) {
709 xfree(authctxt->style);
710 authctxt->style = NULL;
717 mm_answer_authpassword(int sock, Buffer *m)
719 static int call_count;
724 passwd = buffer_get_string(m, &plen);
725 /* Only authenticate if the context is valid */
726 authenticated = options.password_authentication &&
727 auth_password(authctxt, passwd);
728 memset(passwd, 0, strlen(passwd));
732 buffer_put_int(m, authenticated);
734 debug3("%s: sending result %d", __func__, authenticated);
735 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
738 if (plen == 0 && call_count == 1)
739 auth_method = "none";
741 auth_method = "password";
743 /* Causes monitor loop to terminate if authenticated */
744 return (authenticated);
749 mm_answer_bsdauthquery(int sock, Buffer *m)
751 char *name, *infotxt;
757 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
758 &prompts, &echo_on) < 0 ? 0 : 1;
761 buffer_put_int(m, success);
763 buffer_put_cstring(m, prompts[0]);
765 debug3("%s: sending challenge success: %u", __func__, success);
766 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
779 mm_answer_bsdauthrespond(int sock, Buffer *m)
784 if (authctxt->as == 0)
785 fatal("%s: no bsd auth session", __func__);
787 response = buffer_get_string(m, NULL);
788 authok = options.challenge_response_authentication &&
789 auth_userresponse(authctxt->as, response, 0);
791 debug3("%s: <%s> = <%d>", __func__, response, authok);
795 buffer_put_int(m, authok);
797 debug3("%s: sending authenticated: %d", __func__, authok);
798 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
800 auth_method = "bsdauth";
802 return (authok != 0);
808 mm_answer_skeyquery(int sock, Buffer *m)
811 char challenge[1024];
814 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
815 sizeof(challenge)) < 0 ? 0 : 1;
818 buffer_put_int(m, success);
820 buffer_put_cstring(m, challenge);
822 debug3("%s: sending challenge success: %u", __func__, success);
823 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
829 mm_answer_skeyrespond(int sock, Buffer *m)
834 response = buffer_get_string(m, NULL);
836 authok = (options.challenge_response_authentication &&
838 skey_haskey(authctxt->pw->pw_name) == 0 &&
839 skey_passcheck(authctxt->pw->pw_name, response) != -1);
844 buffer_put_int(m, authok);
846 debug3("%s: sending authenticated: %d", __func__, authok);
847 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
849 auth_method = "skey";
851 return (authok != 0);
857 mm_answer_pam_start(int sock, Buffer *m)
859 if (!options.use_pam)
860 fatal("UsePAM not set, but ended up in %s anyway", __func__);
864 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
870 mm_answer_pam_account(int sock, Buffer *m)
874 if (!options.use_pam)
875 fatal("UsePAM not set, but ended up in %s anyway", __func__);
877 ret = do_pam_account();
879 buffer_put_int(m, ret);
880 buffer_append(&loginmsg, "\0", 1);
881 buffer_put_cstring(m, buffer_ptr(&loginmsg));
882 buffer_clear(&loginmsg);
884 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
889 static void *sshpam_ctxt, *sshpam_authok;
890 extern KbdintDevice sshpam_device;
893 mm_answer_pam_init_ctx(int sock, Buffer *m)
896 debug3("%s", __func__);
897 authctxt->user = buffer_get_string(m, NULL);
898 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
899 sshpam_authok = NULL;
901 if (sshpam_ctxt != NULL) {
902 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
903 buffer_put_int(m, 1);
905 buffer_put_int(m, 0);
907 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
912 mm_answer_pam_query(int sock, Buffer *m)
914 char *name, *info, **prompts;
915 u_int i, num, *echo_on;
918 debug3("%s", __func__);
919 sshpam_authok = NULL;
920 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
921 if (ret == 0 && num == 0)
922 sshpam_authok = sshpam_ctxt;
923 if (num > 1 || name == NULL || info == NULL)
926 buffer_put_int(m, ret);
927 buffer_put_cstring(m, name);
929 buffer_put_cstring(m, info);
931 buffer_put_int(m, num);
932 for (i = 0; i < num; ++i) {
933 buffer_put_cstring(m, prompts[i]);
935 buffer_put_int(m, echo_on[i]);
941 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
946 mm_answer_pam_respond(int sock, Buffer *m)
952 debug3("%s", __func__);
953 sshpam_authok = NULL;
954 num = buffer_get_int(m);
956 resp = xmalloc(num * sizeof(char *));
957 for (i = 0; i < num; ++i)
958 resp[i] = buffer_get_string(m, NULL);
959 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
960 for (i = 0; i < num; ++i)
964 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
967 buffer_put_int(m, ret);
968 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
969 auth_method = "keyboard-interactive/pam";
971 sshpam_authok = sshpam_ctxt;
976 mm_answer_pam_free_ctx(int sock, Buffer *m)
979 debug3("%s", __func__);
980 (sshpam_device.free_ctx)(sshpam_ctxt);
982 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
983 return (sshpam_authok == sshpam_ctxt);
988 mm_append_debug(Buffer *m)
990 if (auth_debug_init && buffer_len(&auth_debug)) {
991 debug3("%s: Appending debug messages for child", __func__);
992 buffer_append(m, buffer_ptr(&auth_debug),
993 buffer_len(&auth_debug));
994 buffer_clear(&auth_debug);
999 mm_answer_keyallowed(int sock, Buffer *m)
1002 char *cuser, *chost;
1005 enum mm_keytype type = 0;
1008 debug3("%s entering", __func__);
1010 type = buffer_get_int(m);
1011 cuser = buffer_get_string(m, NULL);
1012 chost = buffer_get_string(m, NULL);
1013 blob = buffer_get_string(m, &bloblen);
1015 key = key_from_blob(blob, bloblen);
1017 if ((compat20 && type == MM_RSAHOSTKEY) ||
1018 (!compat20 && type != MM_RSAHOSTKEY))
1019 fatal("%s: key type and protocol mismatch", __func__);
1021 debug3("%s: key_from_blob: %p", __func__, key);
1023 if (key != NULL && authctxt->valid) {
1026 allowed = options.pubkey_authentication &&
1027 user_key_allowed(authctxt->pw, key);
1030 allowed = options.hostbased_authentication &&
1031 hostbased_key_allowed(authctxt->pw,
1035 key->type = KEY_RSA1; /* XXX */
1036 allowed = options.rhosts_rsa_authentication &&
1037 auth_rhosts_rsa_key_allowed(authctxt->pw,
1041 fatal("%s: unknown key type %d", __func__, type);
1048 /* clear temporarily storage (used by verify) */
1049 monitor_reset_key_state();
1052 /* Save temporarily for comparison in verify */
1054 key_bloblen = bloblen;
1055 key_blobtype = type;
1056 hostbased_cuser = cuser;
1057 hostbased_chost = chost;
1060 debug3("%s: key %p is %s",
1061 __func__, key, allowed ? "allowed" : "disallowed");
1064 buffer_put_int(m, allowed);
1065 buffer_put_int(m, forced_command != NULL);
1069 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1071 if (type == MM_RSAHOSTKEY)
1072 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1078 monitor_valid_userblob(u_char *data, u_int datalen)
1086 buffer_append(&b, data, datalen);
1088 if (datafellows & SSH_OLD_SESSIONID) {
1090 len = buffer_len(&b);
1091 if ((session_id2 == NULL) ||
1092 (len < session_id2_len) ||
1093 (memcmp(p, session_id2, session_id2_len) != 0))
1095 buffer_consume(&b, session_id2_len);
1097 p = buffer_get_string(&b, &len);
1098 if ((session_id2 == NULL) ||
1099 (len != session_id2_len) ||
1100 (memcmp(p, session_id2, session_id2_len) != 0))
1104 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1106 p = buffer_get_string(&b, NULL);
1107 if (strcmp(authctxt->user, p) != 0) {
1108 logit("wrong user name passed to monitor: expected %s != %.100s",
1113 buffer_skip_string(&b);
1114 if (datafellows & SSH_BUG_PKAUTH) {
1115 if (!buffer_get_char(&b))
1118 p = buffer_get_string(&b, NULL);
1119 if (strcmp("publickey", p) != 0)
1122 if (!buffer_get_char(&b))
1124 buffer_skip_string(&b);
1126 buffer_skip_string(&b);
1127 if (buffer_len(&b) != 0)
1134 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1143 buffer_append(&b, data, datalen);
1145 p = buffer_get_string(&b, &len);
1146 if ((session_id2 == NULL) ||
1147 (len != session_id2_len) ||
1148 (memcmp(p, session_id2, session_id2_len) != 0))
1152 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1154 p = buffer_get_string(&b, NULL);
1155 if (strcmp(authctxt->user, p) != 0) {
1156 logit("wrong user name passed to monitor: expected %s != %.100s",
1161 buffer_skip_string(&b); /* service */
1162 p = buffer_get_string(&b, NULL);
1163 if (strcmp(p, "hostbased") != 0)
1166 buffer_skip_string(&b); /* pkalg */
1167 buffer_skip_string(&b); /* pkblob */
1169 /* verify client host, strip trailing dot if necessary */
1170 p = buffer_get_string(&b, NULL);
1171 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1173 if (strcmp(p, chost) != 0)
1177 /* verify client user */
1178 p = buffer_get_string(&b, NULL);
1179 if (strcmp(p, cuser) != 0)
1183 if (buffer_len(&b) != 0)
1190 mm_answer_keyverify(int sock, Buffer *m)
1193 u_char *signature, *data, *blob;
1194 u_int signaturelen, datalen, bloblen;
1198 blob = buffer_get_string(m, &bloblen);
1199 signature = buffer_get_string(m, &signaturelen);
1200 data = buffer_get_string(m, &datalen);
1202 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1203 !monitor_allowed_key(blob, bloblen))
1204 fatal("%s: bad key, not previously allowed", __func__);
1206 key = key_from_blob(blob, bloblen);
1208 fatal("%s: bad public key blob", __func__);
1210 switch (key_blobtype) {
1212 valid_data = monitor_valid_userblob(data, datalen);
1215 valid_data = monitor_valid_hostbasedblob(data, datalen,
1216 hostbased_cuser, hostbased_chost);
1223 fatal("%s: bad signature data blob", __func__);
1225 verified = key_verify(key, signature, signaturelen, data, datalen);
1226 debug3("%s: key %p signature %s",
1227 __func__, key, verified ? "verified" : "unverified");
1234 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1236 monitor_reset_key_state();
1239 buffer_put_int(m, verified);
1240 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1246 mm_record_login(Session *s, struct passwd *pw)
1249 struct sockaddr_storage from;
1252 * Get IP address of client. If the connection is not a socket, let
1253 * the address be 0.0.0.0.
1255 memset(&from, 0, sizeof(from));
1256 fromlen = sizeof(from);
1257 if (packet_connection_is_on_socket()) {
1258 if (getpeername(packet_get_connection_in(),
1259 (struct sockaddr *) & from, &fromlen) < 0) {
1260 debug("getpeername: %.100s", strerror(errno));
1264 /* Record that there was a login on that tty from the remote host. */
1265 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1266 get_remote_name_or_ip(utmp_len, options.use_dns),
1267 (struct sockaddr *)&from, fromlen);
1271 mm_session_close(Session *s)
1273 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1274 if (s->ttyfd != -1) {
1275 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1276 session_pty_cleanup2(s);
1282 mm_answer_pty(int sock, Buffer *m)
1284 extern struct monitor *pmonitor;
1288 debug3("%s entering", __func__);
1294 s->authctxt = authctxt;
1295 s->pw = authctxt->pw;
1296 s->pid = pmonitor->m_pid;
1297 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1300 pty_setowner(authctxt->pw, s->tty);
1302 buffer_put_int(m, 1);
1303 buffer_put_cstring(m, s->tty);
1305 /* We need to trick ttyslot */
1306 if (dup2(s->ttyfd, 0) == -1)
1307 fatal("%s: dup2", __func__);
1309 mm_record_login(s, authctxt->pw);
1311 /* Now we can close the file descriptor again */
1314 /* send messages generated by record_login */
1315 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1316 buffer_clear(&loginmsg);
1318 mm_request_send(sock, MONITOR_ANS_PTY, m);
1320 mm_send_fd(sock, s->ptyfd);
1321 mm_send_fd(sock, s->ttyfd);
1323 /* make sure nothing uses fd 0 */
1324 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1325 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1327 error("%s: fd0 %d != 0", __func__, fd0);
1329 /* slave is not needed */
1331 s->ttyfd = s->ptyfd;
1332 /* no need to dup() because nobody closes ptyfd */
1333 s->ptymaster = s->ptyfd;
1335 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1341 mm_session_close(s);
1342 buffer_put_int(m, 0);
1343 mm_request_send(sock, MONITOR_ANS_PTY, m);
1348 mm_answer_pty_cleanup(int sock, Buffer *m)
1353 debug3("%s entering", __func__);
1355 tty = buffer_get_string(m, NULL);
1356 if ((s = session_by_tty(tty)) != NULL)
1357 mm_session_close(s);
1364 mm_answer_sesskey(int sock, Buffer *m)
1369 /* Turn off permissions */
1370 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1372 if ((p = BN_new()) == NULL)
1373 fatal("%s: BN_new", __func__);
1375 buffer_get_bignum2(m, p);
1377 rsafail = ssh1_session_key(p);
1380 buffer_put_int(m, rsafail);
1381 buffer_put_bignum2(m, p);
1385 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1387 /* Turn on permissions for sessid passing */
1388 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1394 mm_answer_sessid(int sock, Buffer *m)
1398 debug3("%s entering", __func__);
1400 if (buffer_len(m) != 16)
1401 fatal("%s: bad ssh1 session id", __func__);
1402 for (i = 0; i < 16; i++)
1403 session_id[i] = buffer_get_char(m);
1405 /* Turn on permissions for getpwnam */
1406 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1412 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1416 u_char *blob = NULL;
1420 debug3("%s entering", __func__);
1422 if (options.rsa_authentication && authctxt->valid) {
1423 if ((client_n = BN_new()) == NULL)
1424 fatal("%s: BN_new", __func__);
1425 buffer_get_bignum2(m, client_n);
1426 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1427 BN_clear_free(client_n);
1430 buffer_put_int(m, allowed);
1431 buffer_put_int(m, forced_command != NULL);
1433 /* clear temporarily storage (used by generate challenge) */
1434 monitor_reset_key_state();
1436 if (allowed && key != NULL) {
1437 key->type = KEY_RSA; /* cheat for key_to_blob */
1438 if (key_to_blob(key, &blob, &blen) == 0)
1439 fatal("%s: key_to_blob failed", __func__);
1440 buffer_put_string(m, blob, blen);
1442 /* Save temporarily for comparison in verify */
1445 key_blobtype = MM_RSAUSERKEY;
1452 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1454 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1455 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1460 mm_answer_rsa_challenge(int sock, Buffer *m)
1466 debug3("%s entering", __func__);
1468 if (!authctxt->valid)
1469 fatal("%s: authctxt not valid", __func__);
1470 blob = buffer_get_string(m, &blen);
1471 if (!monitor_allowed_key(blob, blen))
1472 fatal("%s: bad key, not previously allowed", __func__);
1473 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1474 fatal("%s: key type mismatch", __func__);
1475 if ((key = key_from_blob(blob, blen)) == NULL)
1476 fatal("%s: received bad key", __func__);
1479 BN_clear_free(ssh1_challenge);
1480 ssh1_challenge = auth_rsa_generate_challenge(key);
1483 buffer_put_bignum2(m, ssh1_challenge);
1485 debug3("%s sending reply", __func__);
1486 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1488 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1496 mm_answer_rsa_response(int sock, Buffer *m)
1499 u_char *blob, *response;
1503 debug3("%s entering", __func__);
1505 if (!authctxt->valid)
1506 fatal("%s: authctxt not valid", __func__);
1507 if (ssh1_challenge == NULL)
1508 fatal("%s: no ssh1_challenge", __func__);
1510 blob = buffer_get_string(m, &blen);
1511 if (!monitor_allowed_key(blob, blen))
1512 fatal("%s: bad key, not previously allowed", __func__);
1513 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1514 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1515 if ((key = key_from_blob(blob, blen)) == NULL)
1516 fatal("%s: received bad key", __func__);
1517 response = buffer_get_string(m, &len);
1519 fatal("%s: received bad response to challenge", __func__);
1520 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1526 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1529 BN_clear_free(ssh1_challenge);
1530 ssh1_challenge = NULL;
1531 monitor_reset_key_state();
1534 buffer_put_int(m, success);
1535 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1541 mm_answer_term(int sock, Buffer *req)
1543 extern struct monitor *pmonitor;
1546 debug3("%s: tearing down sessions", __func__);
1548 /* The child is terminating */
1549 session_destroy_all(&mm_session_close);
1551 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1555 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1557 /* Terminate process */
1561 #ifdef SSH_AUDIT_EVENTS
1562 /* Report that an audit event occurred */
1564 mm_answer_audit_event(int socket, Buffer *m)
1566 ssh_audit_event_t event;
1568 debug3("%s entering", __func__);
1570 event = buffer_get_int(m);
1572 case SSH_AUTH_FAIL_PUBKEY:
1573 case SSH_AUTH_FAIL_HOSTBASED:
1574 case SSH_AUTH_FAIL_GSSAPI:
1575 case SSH_LOGIN_EXCEED_MAXTRIES:
1576 case SSH_LOGIN_ROOT_DENIED:
1577 case SSH_CONNECTION_CLOSE:
1578 case SSH_INVALID_USER:
1582 fatal("Audit event type %d not permitted", event);
1589 mm_answer_audit_command(int socket, Buffer *m)
1594 debug3("%s entering", __func__);
1595 cmd = buffer_get_string(m, &len);
1596 /* sanity check command, if so how? */
1597 audit_run_command(cmd);
1601 #endif /* SSH_AUDIT_EVENTS */
1604 monitor_apply_keystate(struct monitor *pmonitor)
1607 set_newkeys(MODE_IN);
1608 set_newkeys(MODE_OUT);
1610 packet_set_protocol_flags(child_state.ssh1protoflags);
1611 packet_set_encryption_key(child_state.ssh1key,
1612 child_state.ssh1keylen, child_state.ssh1cipher);
1613 xfree(child_state.ssh1key);
1616 /* for rc4 and other stateful ciphers */
1617 packet_set_keycontext(MODE_OUT, child_state.keyout);
1618 xfree(child_state.keyout);
1619 packet_set_keycontext(MODE_IN, child_state.keyin);
1620 xfree(child_state.keyin);
1623 packet_set_iv(MODE_OUT, child_state.ivout);
1624 xfree(child_state.ivout);
1625 packet_set_iv(MODE_IN, child_state.ivin);
1626 xfree(child_state.ivin);
1629 memcpy(&incoming_stream, &child_state.incoming,
1630 sizeof(incoming_stream));
1631 memcpy(&outgoing_stream, &child_state.outgoing,
1632 sizeof(outgoing_stream));
1634 /* Update with new address */
1635 if (options.compression)
1636 mm_init_compression(pmonitor->m_zlib);
1638 /* Network I/O buffers */
1639 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1640 buffer_clear(&input);
1641 buffer_append(&input, child_state.input, child_state.ilen);
1642 memset(child_state.input, 0, child_state.ilen);
1643 xfree(child_state.input);
1645 buffer_clear(&output);
1646 buffer_append(&output, child_state.output, child_state.olen);
1647 memset(child_state.output, 0, child_state.olen);
1648 xfree(child_state.output);
1652 mm_get_kex(Buffer *m)
1658 kex = xmalloc(sizeof(*kex));
1659 memset(kex, 0, sizeof(*kex));
1660 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1661 if ((session_id2 == NULL) ||
1662 (kex->session_id_len != session_id2_len) ||
1663 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1664 fatal("mm_get_get: internal error: bad session id");
1665 kex->we_need = buffer_get_int(m);
1666 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1667 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1668 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1670 kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
1673 kex->hostkey_type = buffer_get_int(m);
1674 kex->kex_type = buffer_get_int(m);
1675 blob = buffer_get_string(m, &bloblen);
1676 buffer_init(&kex->my);
1677 buffer_append(&kex->my, blob, bloblen);
1679 blob = buffer_get_string(m, &bloblen);
1680 buffer_init(&kex->peer);
1681 buffer_append(&kex->peer, blob, bloblen);
1684 kex->flags = buffer_get_int(m);
1685 kex->client_version_string = buffer_get_string(m, NULL);
1686 kex->server_version_string = buffer_get_string(m, NULL);
1687 kex->load_host_key=&get_hostkey_by_type;
1688 kex->host_key_index=&get_hostkey_index;
1693 /* This function requries careful sanity checking */
1696 mm_get_keystate(struct monitor *pmonitor)
1700 u_int bloblen, plen;
1701 u_int32_t seqnr, packets;
1704 debug3("%s: Waiting for new keys", __func__);
1707 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1709 child_state.ssh1protoflags = buffer_get_int(&m);
1710 child_state.ssh1cipher = buffer_get_int(&m);
1711 child_state.ssh1key = buffer_get_string(&m,
1712 &child_state.ssh1keylen);
1713 child_state.ivout = buffer_get_string(&m,
1714 &child_state.ivoutlen);
1715 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1718 /* Get the Kex for rekeying */
1719 *pmonitor->m_pkex = mm_get_kex(&m);
1722 blob = buffer_get_string(&m, &bloblen);
1723 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1726 debug3("%s: Waiting for second key", __func__);
1727 blob = buffer_get_string(&m, &bloblen);
1728 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1731 /* Now get sequence numbers for the packets */
1732 seqnr = buffer_get_int(&m);
1733 blocks = buffer_get_int64(&m);
1734 packets = buffer_get_int(&m);
1735 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1736 seqnr = buffer_get_int(&m);
1737 blocks = buffer_get_int64(&m);
1738 packets = buffer_get_int(&m);
1739 packet_set_state(MODE_IN, seqnr, blocks, packets);
1742 /* Get the key context */
1743 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1744 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1746 debug3("%s: Getting compression state", __func__);
1747 /* Get compression state */
1748 p = buffer_get_string(&m, &plen);
1749 if (plen != sizeof(child_state.outgoing))
1750 fatal("%s: bad request size", __func__);
1751 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1754 p = buffer_get_string(&m, &plen);
1755 if (plen != sizeof(child_state.incoming))
1756 fatal("%s: bad request size", __func__);
1757 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1760 /* Network I/O buffers */
1761 debug3("%s: Getting Network I/O buffers", __func__);
1762 child_state.input = buffer_get_string(&m, &child_state.ilen);
1763 child_state.output = buffer_get_string(&m, &child_state.olen);
1769 /* Allocation functions for zlib */
1771 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1773 size_t len = (size_t) size * ncount;
1776 if (len == 0 || ncount > SIZE_T_MAX / size)
1777 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1779 address = mm_malloc(mm, len);
1785 mm_zfree(struct mm_master *mm, void *address)
1787 mm_free(mm, address);
1791 mm_init_compression(struct mm_master *mm)
1793 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1794 outgoing_stream.zfree = (free_func)mm_zfree;
1795 outgoing_stream.opaque = mm;
1797 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1798 incoming_stream.zfree = (free_func)mm_zfree;
1799 incoming_stream.opaque = mm;
1804 #define FD_CLOSEONEXEC(x) do { \
1805 if (fcntl(x, F_SETFD, 1) == -1) \
1806 fatal("fcntl(%d, F_SETFD)", x); \
1810 monitor_socketpair(int *pair)
1812 #ifdef HAVE_SOCKETPAIR
1813 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1814 fatal("%s: socketpair", __func__);
1816 fatal("%s: UsePrivilegeSeparation=yes not supported",
1819 FD_CLOSEONEXEC(pair[0]);
1820 FD_CLOSEONEXEC(pair[1]);
1823 #define MM_MEMSIZE 65536
1828 struct monitor *mon;
1831 mon = xmalloc(sizeof(*mon));
1834 monitor_socketpair(pair);
1836 mon->m_recvfd = pair[0];
1837 mon->m_sendfd = pair[1];
1839 /* Used to share zlib space across processes */
1840 if (options.compression) {
1841 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1842 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1844 /* Compression needs to share state across borders */
1845 mm_init_compression(mon->m_zlib);
1852 monitor_reinit(struct monitor *mon)
1856 monitor_socketpair(pair);
1858 mon->m_recvfd = pair[0];
1859 mon->m_sendfd = pair[1];
1864 mm_answer_gss_setup_ctx(int sock, Buffer *m)
1870 goid.elements = buffer_get_string(m, &len);
1873 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1875 xfree(goid.elements);
1878 buffer_put_int(m, major);
1880 mm_request_send(sock,MONITOR_ANS_GSSSETUP, m);
1882 /* Now we have a context, enable the step */
1883 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1889 mm_answer_gss_accept_ctx(int sock, Buffer *m)
1892 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1893 OM_uint32 major,minor;
1894 OM_uint32 flags = 0; /* GSI needs this */
1897 in.value = buffer_get_string(m, &len);
1899 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1903 buffer_put_int(m, major);
1904 buffer_put_string(m, out.value, out.length);
1905 buffer_put_int(m, flags);
1906 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1908 gss_release_buffer(&minor, &out);
1910 if (major==GSS_S_COMPLETE) {
1911 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1912 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1913 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
1914 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1920 mm_answer_gss_checkmic(int sock, Buffer *m)
1922 gss_buffer_desc gssbuf, mic;
1926 gssbuf.value = buffer_get_string(m, &len);
1927 gssbuf.length = len;
1928 mic.value = buffer_get_string(m, &len);
1931 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1933 xfree(gssbuf.value);
1937 buffer_put_int(m, ret);
1939 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1941 if (!GSS_ERROR(ret))
1942 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1948 mm_answer_gss_userok(int sock, Buffer *m)
1952 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1955 buffer_put_int(m, authenticated);
1957 debug3("%s: sending result %d", __func__, authenticated);
1958 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1960 auth_method="gssapi-with-mic";
1962 /* Monitor loop will terminate if authenticated */
1963 return (authenticated);
1967 mm_answer_gss_sign(int socket, Buffer *m) {
1968 gss_buffer_desc data,hash;
1969 OM_uint32 major,minor;
1972 data.value = buffer_get_string(m, &len);
1974 if (data.length != 20)
1975 fatal("%s: data length incorrect: %d", __func__,
1978 /* Save the session ID - only first time round */
1979 if (session_id2_len == 0) {
1980 session_id2_len=data.length;
1981 session_id2 = xmalloc(session_id2_len);
1982 memcpy(session_id2, data.value, session_id2_len);
1984 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1989 buffer_put_int(m, major);
1990 buffer_put_string(m, hash.value, hash.length);
1992 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1994 gss_release_buffer(&minor,&hash);
1996 /* Turn on permissions for getpwnam */
1997 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
2003 mm_answer_gss_error(int socket, Buffer *m) {
2004 OM_uint32 major,minor;
2007 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
2009 buffer_put_int(m,major);
2010 buffer_put_int(m,minor);
2011 buffer_put_cstring(m,msg);
2013 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
2021 mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
2022 OM_uint32 major,minor;
2023 gss_OID_set mech_set;
2026 major=gss_indicate_mechs(&minor, &mech_set);
2029 buffer_put_int(m, major);
2030 buffer_put_int(m, mech_set->count);
2031 for (i=0; i < mech_set->count; i++) {
2032 buffer_put_string(m, mech_set->elements[i].elements,
2033 mech_set->elements[i].length);
2036 #if !defined(MECHGLUE) /* mechglue memory management bug ??? */
2037 gss_release_oid_set(&minor,&mech_set);
2040 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
2046 mm_answer_gss_localname(int socket, Buffer *m) {
2049 ssh_gssapi_localname(&name);
2053 buffer_put_cstring(m, name);
2054 debug3("%s: sending result %s", __func__, name);
2057 buffer_put_cstring(m, "");
2058 debug3("%s: sending result \"\"", __func__);
2061 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);