1 /* $OpenBSD: monitor.c,v 1.90 2007/02/19 10:45:58 dtucker Exp $ */
3 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4 * Copyright 2002 Markus Friedl <markus@openbsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/types.h>
31 #include <sys/param.h>
32 #include <sys/socket.h>
33 #include "openbsd-compat/sys-tree.h"
52 #include <openssl/dh.h>
63 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
66 #define TARGET_OS_MAC 1
71 #include "auth-options.h"
80 #include "monitor_mm.h"
84 #include "monitor_wrap.h"
85 #include "monitor_fdpass.h"
91 static Gssctxt *gsscontext = NULL;
95 extern ServerOptions options;
96 extern u_int utmp_len;
97 extern Newkeys *current_keys[];
98 extern z_stream incoming_stream;
99 extern z_stream outgoing_stream;
100 extern u_char session_id[];
101 extern Buffer input, output;
102 extern Buffer auth_debug;
103 extern int auth_debug_init;
104 extern Buffer loginmsg;
106 /* State exported from the child */
129 /* Functions on the monitor that answer unprivileged requests */
131 int mm_answer_moduli(int, Buffer *);
132 int mm_answer_sign(int, Buffer *);
133 int mm_answer_pwnamallow(int, Buffer *);
134 int mm_answer_auth2_read_banner(int, Buffer *);
135 int mm_answer_authserv(int, Buffer *);
136 int mm_answer_authpassword(int, Buffer *);
137 int mm_answer_bsdauthquery(int, Buffer *);
138 int mm_answer_bsdauthrespond(int, Buffer *);
139 int mm_answer_skeyquery(int, Buffer *);
140 int mm_answer_skeyrespond(int, Buffer *);
141 int mm_answer_keyallowed(int, Buffer *);
142 int mm_answer_keyverify(int, Buffer *);
143 int mm_answer_pty(int, Buffer *);
144 int mm_answer_pty_cleanup(int, Buffer *);
145 int mm_answer_term(int, Buffer *);
146 int mm_answer_rsa_keyallowed(int, Buffer *);
147 int mm_answer_rsa_challenge(int, Buffer *);
148 int mm_answer_rsa_response(int, Buffer *);
149 int mm_answer_sesskey(int, Buffer *);
150 int mm_answer_sessid(int, Buffer *);
153 int mm_answer_pam_start(int, Buffer *);
154 int mm_answer_pam_account(int, Buffer *);
155 int mm_answer_pam_init_ctx(int, Buffer *);
156 int mm_answer_pam_query(int, Buffer *);
157 int mm_answer_pam_respond(int, Buffer *);
158 int mm_answer_pam_free_ctx(int, Buffer *);
162 int mm_answer_gss_setup_ctx(int, Buffer *);
163 int mm_answer_gss_accept_ctx(int, Buffer *);
164 int mm_answer_gss_userok(int, Buffer *);
165 int mm_answer_gss_checkmic(int, Buffer *);
166 int mm_answer_gss_sign(int, Buffer *);
167 int mm_answer_gss_error(int, Buffer *);
168 int mm_answer_gss_indicate_mechs(int, Buffer *);
169 int mm_answer_gss_localname(int, Buffer *);
172 #ifdef SSH_AUDIT_EVENTS
173 int mm_answer_audit_event(int, Buffer *);
174 int mm_answer_audit_command(int, Buffer *);
177 static Authctxt *authctxt;
178 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
180 /* local state for key verify */
181 static u_char *key_blob = NULL;
182 static u_int key_bloblen = 0;
183 static int key_blobtype = MM_NOKEY;
184 static char *hostbased_cuser = NULL;
185 static char *hostbased_chost = NULL;
186 static char *auth_method = "unknown";
187 static u_int session_id2_len = 0;
188 static u_char *session_id2 = NULL;
189 static pid_t monitor_child_pid;
192 enum monitor_reqtype type;
194 int (*f)(int, Buffer *);
197 #define MON_ISAUTH 0x0004 /* Required for Authentication */
198 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
199 #define MON_ONCE 0x0010 /* Disable after calling */
200 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
202 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
204 #define MON_PERMIT 0x1000 /* Request is permitted */
206 struct mon_table mon_dispatch_proto20[] = {
207 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
208 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
209 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
210 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
211 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
212 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
214 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
215 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
216 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
217 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
218 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
219 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
221 #ifdef SSH_AUDIT_EVENTS
222 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
225 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
226 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
229 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
230 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
232 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
233 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
235 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
236 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
237 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
238 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
239 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
240 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
241 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
242 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
247 struct mon_table mon_dispatch_postauth20[] = {
249 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
250 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
251 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
252 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
253 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
255 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
256 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
257 {MONITOR_REQ_PTY, 0, mm_answer_pty},
258 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
259 {MONITOR_REQ_TERM, 0, mm_answer_term},
260 #ifdef SSH_AUDIT_EVENTS
261 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
262 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
267 struct mon_table mon_dispatch_proto15[] = {
268 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
269 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
270 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
271 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
272 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
273 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
274 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
275 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
277 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
278 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
281 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
282 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
285 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
286 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
287 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
288 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
289 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
292 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
293 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
294 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
295 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
296 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
297 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
299 #ifdef SSH_AUDIT_EVENTS
300 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
305 struct mon_table mon_dispatch_postauth15[] = {
306 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
307 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
308 {MONITOR_REQ_TERM, 0, mm_answer_term},
309 #ifdef SSH_AUDIT_EVENTS
310 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
311 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
316 struct mon_table *mon_dispatch;
318 /* Specifies if a certain message is allowed at the moment */
321 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
323 while (ent->f != NULL) {
324 if (ent->type == type) {
325 ent->flags &= ~MON_PERMIT;
326 ent->flags |= permit ? MON_PERMIT : 0;
334 monitor_permit_authentications(int permit)
336 struct mon_table *ent = mon_dispatch;
338 while (ent->f != NULL) {
339 if (ent->flags & MON_AUTH) {
340 ent->flags &= ~MON_PERMIT;
341 ent->flags |= permit ? MON_PERMIT : 0;
348 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
350 struct mon_table *ent;
351 int authenticated = 0;
353 debug3("preauth child monitor started");
355 authctxt = _authctxt;
356 memset(authctxt, 0, sizeof(*authctxt));
358 authctxt->loginmsg = &loginmsg;
361 mon_dispatch = mon_dispatch_proto20;
363 /* Permit requests for moduli and signatures */
364 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
365 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
367 /* and for the GSSAPI key exchange */
368 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
369 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
370 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
373 mon_dispatch = mon_dispatch_proto15;
375 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
378 /* The first few requests do not require asynchronous access */
379 while (!authenticated) {
380 auth_method = "unknown";
381 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
383 if (!(ent->flags & MON_AUTHDECIDE))
384 fatal("%s: unexpected authentication from %d",
385 __func__, ent->type);
386 if (authctxt->pw->pw_uid == 0 &&
387 !auth_root_allowed(auth_method))
390 /* PAM needs to perform account checks after auth */
391 if (options.use_pam && authenticated) {
395 mm_request_receive_expect(pmonitor->m_sendfd,
396 MONITOR_REQ_PAM_ACCOUNT, &m);
397 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
403 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
404 auth_log(authctxt, authenticated, auth_method,
405 compat20 ? " ssh2" : "");
407 authctxt->failures++;
411 if (!authctxt->valid)
412 fatal("%s: authenticated invalid user", __func__);
413 if (strcmp(auth_method, "unknown") == 0)
414 fatal("%s: authentication method name unknown", __func__);
416 debug("%s: %s has been authenticated by privileged process",
417 __func__, authctxt->user);
419 mm_get_keystate(pmonitor);
423 monitor_set_child_handler(pid_t pid)
425 monitor_child_pid = pid;
429 monitor_child_handler(int sig)
431 kill(monitor_child_pid, sig);
435 monitor_child_postauth(struct monitor *pmonitor)
437 monitor_set_child_handler(pmonitor->m_pid);
438 signal(SIGHUP, &monitor_child_handler);
439 signal(SIGTERM, &monitor_child_handler);
442 mon_dispatch = mon_dispatch_postauth20;
444 /* Permit requests for moduli and signatures */
445 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
446 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
447 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
450 /* and for the GSSAPI key exchange */
451 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
452 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
453 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
457 mon_dispatch = mon_dispatch_postauth15;
458 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
461 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
464 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
465 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
469 monitor_read(pmonitor, mon_dispatch, NULL);
473 monitor_sync(struct monitor *pmonitor)
475 if (options.compression) {
476 /* The member allocation is not visible, so sync it */
477 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
482 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
483 struct mon_table **pent)
491 mm_request_receive(pmonitor->m_sendfd, &m);
492 type = buffer_get_char(&m);
494 debug3("%s: checking request %d", __func__, type);
496 while (ent->f != NULL) {
497 if (ent->type == type)
502 if (ent->f != NULL) {
503 if (!(ent->flags & MON_PERMIT))
504 fatal("%s: unpermitted request %d", __func__,
506 ret = (*ent->f)(pmonitor->m_sendfd, &m);
509 /* The child may use this request only once, disable it */
510 if (ent->flags & MON_ONCE) {
511 debug2("%s: %d used once, disabling now", __func__,
513 ent->flags &= ~MON_PERMIT;
522 fatal("%s: unsupported request: %d", __func__, type);
528 /* allowed key state */
530 monitor_allowed_key(u_char *blob, u_int bloblen)
532 /* make sure key is allowed */
533 if (key_blob == NULL || key_bloblen != bloblen ||
534 memcmp(key_blob, blob, key_bloblen))
540 monitor_reset_key_state(void)
543 if (key_blob != NULL)
545 if (hostbased_cuser != NULL)
546 xfree(hostbased_cuser);
547 if (hostbased_chost != NULL)
548 xfree(hostbased_chost);
551 key_blobtype = MM_NOKEY;
552 hostbased_cuser = NULL;
553 hostbased_chost = NULL;
557 mm_answer_moduli(int sock, Buffer *m)
562 min = buffer_get_int(m);
563 want = buffer_get_int(m);
564 max = buffer_get_int(m);
566 debug3("%s: got parameters: %d %d %d",
567 __func__, min, want, max);
568 /* We need to check here, too, in case the child got corrupted */
569 if (max < min || want < min || max < want)
570 fatal("%s: bad parameters: %d %d %d",
571 __func__, min, want, max);
575 dh = choose_dh(min, want, max);
577 buffer_put_char(m, 0);
580 /* Send first bignum */
581 buffer_put_char(m, 1);
582 buffer_put_bignum2(m, dh->p);
583 buffer_put_bignum2(m, dh->g);
587 mm_request_send(sock, MONITOR_ANS_MODULI, m);
592 mm_answer_sign(int sock, Buffer *m)
597 u_int siglen, datlen;
600 debug3("%s", __func__);
602 keyid = buffer_get_int(m);
603 p = buffer_get_string(m, &datlen);
606 * Supported KEX types will only return SHA1 (20 byte) or
607 * SHA256 (32 byte) hashes
609 if (datlen != 20 && datlen != 32)
610 fatal("%s: data length incorrect: %u", __func__, datlen);
612 /* save session id, it will be passed on the first call */
613 if (session_id2_len == 0) {
614 session_id2_len = datlen;
615 session_id2 = xmalloc(session_id2_len);
616 memcpy(session_id2, p, session_id2_len);
619 if ((key = get_hostkey_by_index(keyid)) == NULL)
620 fatal("%s: no hostkey from index %d", __func__, keyid);
621 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
622 fatal("%s: key_sign failed", __func__);
624 debug3("%s: signature %p(%u)", __func__, signature, siglen);
627 buffer_put_string(m, signature, siglen);
632 mm_request_send(sock, MONITOR_ANS_SIGN, m);
634 /* Turn on permissions for getpwnam */
635 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
640 /* Retrieves the password entry and also checks if the user is permitted */
643 mm_answer_pwnamallow(int sock, Buffer *m)
646 struct passwd *pwent;
649 debug3("%s", __func__);
651 username = buffer_get_string(m, NULL);
653 pwent = getpwnamallow(username);
655 if (authctxt->user) xfree(authctxt->user);
656 authctxt->user = xstrdup(username);
657 setproctitle("%s [priv]", pwent ? username : "unknown");
663 buffer_put_char(m, 0);
664 authctxt->pw = fakepw();
669 authctxt->pw = pwent;
672 buffer_put_char(m, 1);
673 buffer_put_string(m, pwent, sizeof(struct passwd));
674 buffer_put_cstring(m, pwent->pw_name);
675 buffer_put_cstring(m, "*");
676 buffer_put_cstring(m, pwent->pw_gecos);
677 #ifdef HAVE_PW_CLASS_IN_PASSWD
678 buffer_put_cstring(m, pwent->pw_class);
680 buffer_put_cstring(m, pwent->pw_dir);
681 buffer_put_cstring(m, pwent->pw_shell);
682 buffer_put_string(m, &options, sizeof(options));
683 if (options.banner != NULL)
684 buffer_put_cstring(m, options.banner);
687 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
688 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
690 /* For SSHv1 allow authentication now */
692 monitor_permit_authentications(1);
694 /* Allow service/style information on the auth context */
695 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
696 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
701 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
707 int mm_answer_auth2_read_banner(int sock, Buffer *m)
712 banner = auth2_read_banner();
713 buffer_put_cstring(m, banner != NULL ? banner : "");
714 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
723 mm_answer_authserv(int sock, Buffer *m)
725 monitor_permit_authentications(1);
727 authctxt->service = buffer_get_string(m, NULL);
728 authctxt->style = buffer_get_string(m, NULL);
729 debug3("%s: service=%s, style=%s",
730 __func__, authctxt->service, authctxt->style);
732 if (strlen(authctxt->style) == 0) {
733 xfree(authctxt->style);
734 authctxt->style = NULL;
741 mm_answer_authpassword(int sock, Buffer *m)
743 static int call_count;
748 passwd = buffer_get_string(m, &plen);
749 /* Only authenticate if the context is valid */
750 authenticated = options.password_authentication &&
751 auth_password(authctxt, passwd);
752 memset(passwd, 0, strlen(passwd));
756 buffer_put_int(m, authenticated);
758 debug3("%s: sending result %d", __func__, authenticated);
759 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
762 if (plen == 0 && call_count == 1)
763 auth_method = "none";
765 auth_method = "password";
767 /* Causes monitor loop to terminate if authenticated */
768 return (authenticated);
773 mm_answer_bsdauthquery(int sock, Buffer *m)
775 char *name, *infotxt;
781 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
782 &prompts, &echo_on) < 0 ? 0 : 1;
785 buffer_put_int(m, success);
787 buffer_put_cstring(m, prompts[0]);
789 debug3("%s: sending challenge success: %u", __func__, success);
790 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
803 mm_answer_bsdauthrespond(int sock, Buffer *m)
808 if (authctxt->as == 0)
809 fatal("%s: no bsd auth session", __func__);
811 response = buffer_get_string(m, NULL);
812 authok = options.challenge_response_authentication &&
813 auth_userresponse(authctxt->as, response, 0);
815 debug3("%s: <%s> = <%d>", __func__, response, authok);
819 buffer_put_int(m, authok);
821 debug3("%s: sending authenticated: %d", __func__, authok);
822 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
824 auth_method = "bsdauth";
826 return (authok != 0);
832 mm_answer_skeyquery(int sock, Buffer *m)
835 char challenge[1024];
838 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
839 sizeof(challenge)) < 0 ? 0 : 1;
842 buffer_put_int(m, success);
844 buffer_put_cstring(m, challenge);
846 debug3("%s: sending challenge success: %u", __func__, success);
847 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
853 mm_answer_skeyrespond(int sock, Buffer *m)
858 response = buffer_get_string(m, NULL);
860 authok = (options.challenge_response_authentication &&
862 skey_haskey(authctxt->pw->pw_name) == 0 &&
863 skey_passcheck(authctxt->pw->pw_name, response) != -1);
868 buffer_put_int(m, authok);
870 debug3("%s: sending authenticated: %d", __func__, authok);
871 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
873 auth_method = "skey";
875 return (authok != 0);
881 mm_answer_pam_start(int sock, Buffer *m)
883 if (!options.use_pam)
884 fatal("UsePAM not set, but ended up in %s anyway", __func__);
888 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
894 mm_answer_pam_account(int sock, Buffer *m)
898 if (!options.use_pam)
899 fatal("UsePAM not set, but ended up in %s anyway", __func__);
901 ret = do_pam_account();
903 buffer_put_int(m, ret);
904 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
906 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
911 static void *sshpam_ctxt, *sshpam_authok;
912 extern KbdintDevice sshpam_device;
915 mm_answer_pam_init_ctx(int sock, Buffer *m)
918 debug3("%s", __func__);
919 authctxt->user = buffer_get_string(m, NULL);
920 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
921 sshpam_authok = NULL;
923 if (sshpam_ctxt != NULL) {
924 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
925 buffer_put_int(m, 1);
927 buffer_put_int(m, 0);
929 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
934 mm_answer_pam_query(int sock, Buffer *m)
936 char *name, *info, **prompts;
937 u_int i, num, *echo_on;
940 debug3("%s", __func__);
941 sshpam_authok = NULL;
942 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
943 if (ret == 0 && num == 0)
944 sshpam_authok = sshpam_ctxt;
945 if (num > 1 || name == NULL || info == NULL)
948 buffer_put_int(m, ret);
949 buffer_put_cstring(m, name);
951 buffer_put_cstring(m, info);
953 buffer_put_int(m, num);
954 for (i = 0; i < num; ++i) {
955 buffer_put_cstring(m, prompts[i]);
957 buffer_put_int(m, echo_on[i]);
963 auth_method = "keyboard-interactive/pam";
964 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
969 mm_answer_pam_respond(int sock, Buffer *m)
975 debug3("%s", __func__);
976 sshpam_authok = NULL;
977 num = buffer_get_int(m);
979 resp = xcalloc(num, sizeof(char *));
980 for (i = 0; i < num; ++i)
981 resp[i] = buffer_get_string(m, NULL);
982 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
983 for (i = 0; i < num; ++i)
987 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
990 buffer_put_int(m, ret);
991 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
992 auth_method = "keyboard-interactive/pam";
994 sshpam_authok = sshpam_ctxt;
999 mm_answer_pam_free_ctx(int sock, Buffer *m)
1002 debug3("%s", __func__);
1003 (sshpam_device.free_ctx)(sshpam_ctxt);
1005 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
1006 auth_method = "keyboard-interactive/pam";
1007 return (sshpam_authok == sshpam_ctxt);
1012 mm_append_debug(Buffer *m)
1014 if (auth_debug_init && buffer_len(&auth_debug)) {
1015 debug3("%s: Appending debug messages for child", __func__);
1016 buffer_append(m, buffer_ptr(&auth_debug),
1017 buffer_len(&auth_debug));
1018 buffer_clear(&auth_debug);
1023 mm_answer_keyallowed(int sock, Buffer *m)
1026 char *cuser, *chost;
1029 enum mm_keytype type = 0;
1032 debug3("%s entering", __func__);
1034 type = buffer_get_int(m);
1035 cuser = buffer_get_string(m, NULL);
1036 chost = buffer_get_string(m, NULL);
1037 blob = buffer_get_string(m, &bloblen);
1039 key = key_from_blob(blob, bloblen);
1041 if ((compat20 && type == MM_RSAHOSTKEY) ||
1042 (!compat20 && type != MM_RSAHOSTKEY))
1043 fatal("%s: key type and protocol mismatch", __func__);
1045 debug3("%s: key_from_blob: %p", __func__, key);
1047 if (key != NULL && authctxt->valid) {
1050 allowed = options.pubkey_authentication &&
1051 user_key_allowed(authctxt->pw, key);
1052 auth_method = "publickey";
1055 allowed = options.hostbased_authentication &&
1056 hostbased_key_allowed(authctxt->pw,
1058 auth_method = "hostbased";
1061 key->type = KEY_RSA1; /* XXX */
1062 allowed = options.rhosts_rsa_authentication &&
1063 auth_rhosts_rsa_key_allowed(authctxt->pw,
1065 auth_method = "rsa";
1068 fatal("%s: unknown key type %d", __func__, type);
1075 /* clear temporarily storage (used by verify) */
1076 monitor_reset_key_state();
1079 /* Save temporarily for comparison in verify */
1081 key_bloblen = bloblen;
1082 key_blobtype = type;
1083 hostbased_cuser = cuser;
1084 hostbased_chost = chost;
1086 /* Log failed attempt */
1087 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
1093 debug3("%s: key %p is %s",
1094 __func__, key, allowed ? "allowed" : "disallowed");
1097 buffer_put_int(m, allowed);
1098 buffer_put_int(m, forced_command != NULL);
1102 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1104 if (type == MM_RSAHOSTKEY)
1105 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1111 monitor_valid_userblob(u_char *data, u_int datalen)
1119 buffer_append(&b, data, datalen);
1121 if (datafellows & SSH_OLD_SESSIONID) {
1123 len = buffer_len(&b);
1124 if ((session_id2 == NULL) ||
1125 (len < session_id2_len) ||
1126 (memcmp(p, session_id2, session_id2_len) != 0))
1128 buffer_consume(&b, session_id2_len);
1130 p = buffer_get_string(&b, &len);
1131 if ((session_id2 == NULL) ||
1132 (len != session_id2_len) ||
1133 (memcmp(p, session_id2, session_id2_len) != 0))
1137 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1139 p = buffer_get_string(&b, NULL);
1140 if (strcmp(authctxt->user, p) != 0) {
1141 logit("wrong user name passed to monitor: expected %s != %.100s",
1146 buffer_skip_string(&b);
1147 if (datafellows & SSH_BUG_PKAUTH) {
1148 if (!buffer_get_char(&b))
1151 p = buffer_get_string(&b, NULL);
1152 if (strcmp("publickey", p) != 0)
1155 if (!buffer_get_char(&b))
1157 buffer_skip_string(&b);
1159 buffer_skip_string(&b);
1160 if (buffer_len(&b) != 0)
1167 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1176 buffer_append(&b, data, datalen);
1178 p = buffer_get_string(&b, &len);
1179 if ((session_id2 == NULL) ||
1180 (len != session_id2_len) ||
1181 (memcmp(p, session_id2, session_id2_len) != 0))
1185 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1187 p = buffer_get_string(&b, NULL);
1188 if (strcmp(authctxt->user, p) != 0) {
1189 logit("wrong user name passed to monitor: expected %s != %.100s",
1194 buffer_skip_string(&b); /* service */
1195 p = buffer_get_string(&b, NULL);
1196 if (strcmp(p, "hostbased") != 0)
1199 buffer_skip_string(&b); /* pkalg */
1200 buffer_skip_string(&b); /* pkblob */
1202 /* verify client host, strip trailing dot if necessary */
1203 p = buffer_get_string(&b, NULL);
1204 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1206 if (strcmp(p, chost) != 0)
1210 /* verify client user */
1211 p = buffer_get_string(&b, NULL);
1212 if (strcmp(p, cuser) != 0)
1216 if (buffer_len(&b) != 0)
1223 mm_answer_keyverify(int sock, Buffer *m)
1226 u_char *signature, *data, *blob;
1227 u_int signaturelen, datalen, bloblen;
1231 blob = buffer_get_string(m, &bloblen);
1232 signature = buffer_get_string(m, &signaturelen);
1233 data = buffer_get_string(m, &datalen);
1235 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1236 !monitor_allowed_key(blob, bloblen))
1237 fatal("%s: bad key, not previously allowed", __func__);
1239 key = key_from_blob(blob, bloblen);
1241 fatal("%s: bad public key blob", __func__);
1243 switch (key_blobtype) {
1245 valid_data = monitor_valid_userblob(data, datalen);
1248 valid_data = monitor_valid_hostbasedblob(data, datalen,
1249 hostbased_cuser, hostbased_chost);
1256 fatal("%s: bad signature data blob", __func__);
1258 verified = key_verify(key, signature, signaturelen, data, datalen);
1259 debug3("%s: key %p signature %s",
1260 __func__, key, (verified == 1) ? "verified" : "unverified");
1267 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1269 monitor_reset_key_state();
1272 buffer_put_int(m, verified);
1273 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1275 return (verified == 1);
1279 mm_record_login(Session *s, struct passwd *pw)
1282 struct sockaddr_storage from;
1285 * Get IP address of client. If the connection is not a socket, let
1286 * the address be 0.0.0.0.
1288 memset(&from, 0, sizeof(from));
1289 fromlen = sizeof(from);
1290 if (packet_connection_is_on_socket()) {
1291 if (getpeername(packet_get_connection_in(),
1292 (struct sockaddr *)&from, &fromlen) < 0) {
1293 debug("getpeername: %.100s", strerror(errno));
1297 /* Record that there was a login on that tty from the remote host. */
1298 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1299 get_remote_name_or_ip(utmp_len, options.use_dns),
1300 (struct sockaddr *)&from, fromlen);
1304 mm_session_close(Session *s)
1306 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1307 if (s->ttyfd != -1) {
1308 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1309 session_pty_cleanup2(s);
1315 mm_answer_pty(int sock, Buffer *m)
1317 extern struct monitor *pmonitor;
1321 debug3("%s entering", __func__);
1327 s->authctxt = authctxt;
1328 s->pw = authctxt->pw;
1329 s->pid = pmonitor->m_pid;
1330 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1333 pty_setowner(authctxt->pw, s->tty);
1335 buffer_put_int(m, 1);
1336 buffer_put_cstring(m, s->tty);
1338 /* We need to trick ttyslot */
1339 if (dup2(s->ttyfd, 0) == -1)
1340 fatal("%s: dup2", __func__);
1342 mm_record_login(s, authctxt->pw);
1344 /* Now we can close the file descriptor again */
1347 /* send messages generated by record_login */
1348 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1349 buffer_clear(&loginmsg);
1351 mm_request_send(sock, MONITOR_ANS_PTY, m);
1353 mm_send_fd(sock, s->ptyfd);
1354 mm_send_fd(sock, s->ttyfd);
1356 /* make sure nothing uses fd 0 */
1357 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1358 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1360 error("%s: fd0 %d != 0", __func__, fd0);
1362 /* slave is not needed */
1364 s->ttyfd = s->ptyfd;
1365 /* no need to dup() because nobody closes ptyfd */
1366 s->ptymaster = s->ptyfd;
1368 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1374 mm_session_close(s);
1375 buffer_put_int(m, 0);
1376 mm_request_send(sock, MONITOR_ANS_PTY, m);
1381 mm_answer_pty_cleanup(int sock, Buffer *m)
1386 debug3("%s entering", __func__);
1388 tty = buffer_get_string(m, NULL);
1389 if ((s = session_by_tty(tty)) != NULL)
1390 mm_session_close(s);
1397 mm_answer_sesskey(int sock, Buffer *m)
1402 /* Turn off permissions */
1403 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1405 if ((p = BN_new()) == NULL)
1406 fatal("%s: BN_new", __func__);
1408 buffer_get_bignum2(m, p);
1410 rsafail = ssh1_session_key(p);
1413 buffer_put_int(m, rsafail);
1414 buffer_put_bignum2(m, p);
1418 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1420 /* Turn on permissions for sessid passing */
1421 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1427 mm_answer_sessid(int sock, Buffer *m)
1431 debug3("%s entering", __func__);
1433 if (buffer_len(m) != 16)
1434 fatal("%s: bad ssh1 session id", __func__);
1435 for (i = 0; i < 16; i++)
1436 session_id[i] = buffer_get_char(m);
1438 /* Turn on permissions for getpwnam */
1439 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1445 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1449 u_char *blob = NULL;
1453 debug3("%s entering", __func__);
1455 auth_method = "rsa";
1456 if (options.rsa_authentication && authctxt->valid) {
1457 if ((client_n = BN_new()) == NULL)
1458 fatal("%s: BN_new", __func__);
1459 buffer_get_bignum2(m, client_n);
1460 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1461 BN_clear_free(client_n);
1464 buffer_put_int(m, allowed);
1465 buffer_put_int(m, forced_command != NULL);
1467 /* clear temporarily storage (used by generate challenge) */
1468 monitor_reset_key_state();
1470 if (allowed && key != NULL) {
1471 key->type = KEY_RSA; /* cheat for key_to_blob */
1472 if (key_to_blob(key, &blob, &blen) == 0)
1473 fatal("%s: key_to_blob failed", __func__);
1474 buffer_put_string(m, blob, blen);
1476 /* Save temporarily for comparison in verify */
1479 key_blobtype = MM_RSAUSERKEY;
1486 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1488 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1489 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1494 mm_answer_rsa_challenge(int sock, Buffer *m)
1500 debug3("%s entering", __func__);
1502 if (!authctxt->valid)
1503 fatal("%s: authctxt not valid", __func__);
1504 blob = buffer_get_string(m, &blen);
1505 if (!monitor_allowed_key(blob, blen))
1506 fatal("%s: bad key, not previously allowed", __func__);
1507 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1508 fatal("%s: key type mismatch", __func__);
1509 if ((key = key_from_blob(blob, blen)) == NULL)
1510 fatal("%s: received bad key", __func__);
1513 BN_clear_free(ssh1_challenge);
1514 ssh1_challenge = auth_rsa_generate_challenge(key);
1517 buffer_put_bignum2(m, ssh1_challenge);
1519 debug3("%s sending reply", __func__);
1520 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1522 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1530 mm_answer_rsa_response(int sock, Buffer *m)
1533 u_char *blob, *response;
1537 debug3("%s entering", __func__);
1539 if (!authctxt->valid)
1540 fatal("%s: authctxt not valid", __func__);
1541 if (ssh1_challenge == NULL)
1542 fatal("%s: no ssh1_challenge", __func__);
1544 blob = buffer_get_string(m, &blen);
1545 if (!monitor_allowed_key(blob, blen))
1546 fatal("%s: bad key, not previously allowed", __func__);
1547 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1548 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1549 if ((key = key_from_blob(blob, blen)) == NULL)
1550 fatal("%s: received bad key", __func__);
1551 response = buffer_get_string(m, &len);
1553 fatal("%s: received bad response to challenge", __func__);
1554 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1560 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1563 BN_clear_free(ssh1_challenge);
1564 ssh1_challenge = NULL;
1565 monitor_reset_key_state();
1568 buffer_put_int(m, success);
1569 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1575 mm_answer_term(int sock, Buffer *req)
1577 extern struct monitor *pmonitor;
1580 debug3("%s: tearing down sessions", __func__);
1582 /* The child is terminating */
1583 session_destroy_all(&mm_session_close);
1585 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1589 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1591 /* Terminate process */
1595 #ifdef SSH_AUDIT_EVENTS
1596 /* Report that an audit event occurred */
1598 mm_answer_audit_event(int socket, Buffer *m)
1600 ssh_audit_event_t event;
1602 debug3("%s entering", __func__);
1604 event = buffer_get_int(m);
1606 case SSH_AUTH_FAIL_PUBKEY:
1607 case SSH_AUTH_FAIL_HOSTBASED:
1608 case SSH_AUTH_FAIL_GSSAPI:
1609 case SSH_LOGIN_EXCEED_MAXTRIES:
1610 case SSH_LOGIN_ROOT_DENIED:
1611 case SSH_CONNECTION_CLOSE:
1612 case SSH_INVALID_USER:
1616 fatal("Audit event type %d not permitted", event);
1623 mm_answer_audit_command(int socket, Buffer *m)
1628 debug3("%s entering", __func__);
1629 cmd = buffer_get_string(m, &len);
1630 /* sanity check command, if so how? */
1631 audit_run_command(cmd);
1635 #endif /* SSH_AUDIT_EVENTS */
1638 monitor_apply_keystate(struct monitor *pmonitor)
1641 set_newkeys(MODE_IN);
1642 set_newkeys(MODE_OUT);
1644 packet_set_protocol_flags(child_state.ssh1protoflags);
1645 packet_set_encryption_key(child_state.ssh1key,
1646 child_state.ssh1keylen, child_state.ssh1cipher);
1647 xfree(child_state.ssh1key);
1650 /* for rc4 and other stateful ciphers */
1651 packet_set_keycontext(MODE_OUT, child_state.keyout);
1652 xfree(child_state.keyout);
1653 packet_set_keycontext(MODE_IN, child_state.keyin);
1654 xfree(child_state.keyin);
1657 packet_set_iv(MODE_OUT, child_state.ivout);
1658 xfree(child_state.ivout);
1659 packet_set_iv(MODE_IN, child_state.ivin);
1660 xfree(child_state.ivin);
1663 memcpy(&incoming_stream, &child_state.incoming,
1664 sizeof(incoming_stream));
1665 memcpy(&outgoing_stream, &child_state.outgoing,
1666 sizeof(outgoing_stream));
1668 /* Update with new address */
1669 if (options.compression)
1670 mm_init_compression(pmonitor->m_zlib);
1672 /* Network I/O buffers */
1673 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1674 buffer_clear(&input);
1675 buffer_append(&input, child_state.input, child_state.ilen);
1676 memset(child_state.input, 0, child_state.ilen);
1677 xfree(child_state.input);
1679 buffer_clear(&output);
1680 buffer_append(&output, child_state.output, child_state.olen);
1681 memset(child_state.output, 0, child_state.olen);
1682 xfree(child_state.output);
1686 mm_get_kex(Buffer *m)
1692 kex = xcalloc(1, sizeof(*kex));
1693 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1694 if ((session_id2 == NULL) ||
1695 (kex->session_id_len != session_id2_len) ||
1696 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1697 fatal("mm_get_get: internal error: bad session id");
1698 kex->we_need = buffer_get_int(m);
1699 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1700 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1701 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1702 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1704 kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
1705 kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server;
1706 kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server;
1709 kex->hostkey_type = buffer_get_int(m);
1710 kex->kex_type = buffer_get_int(m);
1711 blob = buffer_get_string(m, &bloblen);
1712 buffer_init(&kex->my);
1713 buffer_append(&kex->my, blob, bloblen);
1715 blob = buffer_get_string(m, &bloblen);
1716 buffer_init(&kex->peer);
1717 buffer_append(&kex->peer, blob, bloblen);
1720 kex->flags = buffer_get_int(m);
1721 kex->client_version_string = buffer_get_string(m, NULL);
1722 kex->server_version_string = buffer_get_string(m, NULL);
1723 kex->load_host_key=&get_hostkey_by_type;
1724 kex->host_key_index=&get_hostkey_index;
1729 /* This function requries careful sanity checking */
1732 mm_get_keystate(struct monitor *pmonitor)
1736 u_int bloblen, plen;
1737 u_int32_t seqnr, packets;
1740 debug3("%s: Waiting for new keys", __func__);
1743 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1745 child_state.ssh1protoflags = buffer_get_int(&m);
1746 child_state.ssh1cipher = buffer_get_int(&m);
1747 child_state.ssh1key = buffer_get_string(&m,
1748 &child_state.ssh1keylen);
1749 child_state.ivout = buffer_get_string(&m,
1750 &child_state.ivoutlen);
1751 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1754 /* Get the Kex for rekeying */
1755 *pmonitor->m_pkex = mm_get_kex(&m);
1758 blob = buffer_get_string(&m, &bloblen);
1759 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1762 debug3("%s: Waiting for second key", __func__);
1763 blob = buffer_get_string(&m, &bloblen);
1764 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1767 /* Now get sequence numbers for the packets */
1768 seqnr = buffer_get_int(&m);
1769 blocks = buffer_get_int64(&m);
1770 packets = buffer_get_int(&m);
1771 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1772 seqnr = buffer_get_int(&m);
1773 blocks = buffer_get_int64(&m);
1774 packets = buffer_get_int(&m);
1775 packet_set_state(MODE_IN, seqnr, blocks, packets);
1778 /* Get the key context */
1779 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1780 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1782 debug3("%s: Getting compression state", __func__);
1783 /* Get compression state */
1784 p = buffer_get_string(&m, &plen);
1785 if (plen != sizeof(child_state.outgoing))
1786 fatal("%s: bad request size", __func__);
1787 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1790 p = buffer_get_string(&m, &plen);
1791 if (plen != sizeof(child_state.incoming))
1792 fatal("%s: bad request size", __func__);
1793 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1796 /* Network I/O buffers */
1797 debug3("%s: Getting Network I/O buffers", __func__);
1798 child_state.input = buffer_get_string(&m, &child_state.ilen);
1799 child_state.output = buffer_get_string(&m, &child_state.olen);
1805 /* Allocation functions for zlib */
1807 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1809 size_t len = (size_t) size * ncount;
1812 if (len == 0 || ncount > SIZE_T_MAX / size)
1813 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1815 address = mm_malloc(mm, len);
1821 mm_zfree(struct mm_master *mm, void *address)
1823 mm_free(mm, address);
1827 mm_init_compression(struct mm_master *mm)
1829 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1830 outgoing_stream.zfree = (free_func)mm_zfree;
1831 outgoing_stream.opaque = mm;
1833 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1834 incoming_stream.zfree = (free_func)mm_zfree;
1835 incoming_stream.opaque = mm;
1840 #define FD_CLOSEONEXEC(x) do { \
1841 if (fcntl(x, F_SETFD, 1) == -1) \
1842 fatal("fcntl(%d, F_SETFD)", x); \
1846 monitor_socketpair(int *pair)
1848 #ifdef HAVE_SOCKETPAIR
1849 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1850 fatal("%s: socketpair", __func__);
1852 fatal("%s: UsePrivilegeSeparation=yes not supported",
1855 FD_CLOSEONEXEC(pair[0]);
1856 FD_CLOSEONEXEC(pair[1]);
1859 #define MM_MEMSIZE 65536
1864 struct monitor *mon;
1867 mon = xcalloc(1, sizeof(*mon));
1869 monitor_socketpair(pair);
1871 mon->m_recvfd = pair[0];
1872 mon->m_sendfd = pair[1];
1874 /* Used to share zlib space across processes */
1875 if (options.compression) {
1876 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1877 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1879 /* Compression needs to share state across borders */
1880 mm_init_compression(mon->m_zlib);
1887 monitor_reinit(struct monitor *mon)
1891 monitor_socketpair(pair);
1893 mon->m_recvfd = pair[0];
1894 mon->m_sendfd = pair[1];
1899 mm_answer_gss_setup_ctx(int sock, Buffer *m)
1905 goid.elements = buffer_get_string(m, &len);
1908 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1910 xfree(goid.elements);
1913 buffer_put_int(m, major);
1915 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1917 /* Now we have a context, enable the step */
1918 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1924 mm_answer_gss_accept_ctx(int sock, Buffer *m)
1927 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1928 OM_uint32 major, minor;
1929 OM_uint32 flags = 0; /* GSI needs this */
1932 in.value = buffer_get_string(m, &len);
1934 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1938 buffer_put_int(m, major);
1939 buffer_put_string(m, out.value, out.length);
1940 buffer_put_int(m, flags);
1941 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1943 gss_release_buffer(&minor, &out);
1945 if (major == GSS_S_COMPLETE) {
1946 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1947 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1948 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
1949 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1950 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
1956 mm_answer_gss_checkmic(int sock, Buffer *m)
1958 gss_buffer_desc gssbuf, mic;
1962 gssbuf.value = buffer_get_string(m, &len);
1963 gssbuf.length = len;
1964 mic.value = buffer_get_string(m, &len);
1967 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1969 xfree(gssbuf.value);
1973 buffer_put_int(m, ret);
1975 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1977 if (!GSS_ERROR(ret))
1978 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1984 mm_answer_gss_userok(int sock, Buffer *m)
1988 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1991 buffer_put_int(m, authenticated);
1993 debug3("%s: sending result %d", __func__, authenticated);
1994 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1996 auth_method = "gssapi-with-mic";
1998 /* Monitor loop will terminate if authenticated */
1999 return (authenticated);
2003 mm_answer_gss_sign(int socket, Buffer *m)
2005 gss_buffer_desc data;
2006 gss_buffer_desc hash = GSS_C_EMPTY_BUFFER;
2007 OM_uint32 major, minor;
2010 data.value = buffer_get_string(m, &len);
2012 if (data.length != 20)
2013 fatal("%s: data length incorrect: %d", __func__, data.length);
2015 /* Save the session ID on the first time around */
2016 if (session_id2_len == 0) {
2017 session_id2_len = data.length;
2018 session_id2 = xmalloc(session_id2_len);
2019 memcpy(session_id2, data.value, session_id2_len);
2021 major = ssh_gssapi_sign(gsscontext, &data, &hash);
2026 buffer_put_int(m, major);
2027 buffer_put_string(m, hash.value, hash.length);
2029 mm_request_send(socket, MONITOR_ANS_GSSSIGN, m);
2031 gss_release_buffer(&minor, &hash);
2033 /* Turn on getpwnam permissions */
2034 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
2040 mm_answer_gss_error(int socket, Buffer *m) {
2041 OM_uint32 major,minor;
2044 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
2046 buffer_put_int(m,major);
2047 buffer_put_int(m,minor);
2048 buffer_put_cstring(m,msg);
2050 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
2058 mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
2059 OM_uint32 major,minor;
2060 gss_OID_set mech_set;
2063 major=gss_indicate_mechs(&minor, &mech_set);
2066 buffer_put_int(m, major);
2067 buffer_put_int(m, mech_set->count);
2068 for (i=0; i < mech_set->count; i++) {
2069 buffer_put_string(m, mech_set->elements[i].elements,
2070 mech_set->elements[i].length);
2073 #if !defined(MECHGLUE) /* mechglue memory management bug ??? */
2074 gss_release_oid_set(&minor,&mech_set);
2077 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
2083 mm_answer_gss_localname(int socket, Buffer *m) {
2086 ssh_gssapi_localname(&name);
2090 buffer_put_cstring(m, name);
2091 debug3("%s: sending result %s", __func__, name);
2094 buffer_put_cstring(m, "");
2095 debug3("%s: sending result \"\"", __func__);
2098 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);