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 1.55 2004/02/05 05:37:17 dtucker Exp $");
30 #include <openssl/dh.h>
42 #include "auth-options.h"
51 #include "monitor_mm.h"
52 #include "monitor_wrap.h"
53 #include "monitor_fdpass.h"
64 static Gssctxt *gsscontext = NULL;
68 extern ServerOptions options;
69 extern u_int utmp_len;
70 extern Newkeys *current_keys[];
71 extern z_stream incoming_stream;
72 extern z_stream outgoing_stream;
73 extern u_char session_id[];
74 extern Buffer input, output;
75 extern Buffer auth_debug;
76 extern int auth_debug_init;
78 /* State exported from the child */
101 /* Functions on the monitor that answer unprivileged requests */
103 int mm_answer_moduli(int, Buffer *);
104 int mm_answer_sign(int, Buffer *);
105 int mm_answer_pwnamallow(int, Buffer *);
106 int mm_answer_auth2_read_banner(int, Buffer *);
107 int mm_answer_authserv(int, Buffer *);
108 int mm_answer_authpassword(int, Buffer *);
109 int mm_answer_bsdauthquery(int, Buffer *);
110 int mm_answer_bsdauthrespond(int, Buffer *);
111 int mm_answer_skeyquery(int, Buffer *);
112 int mm_answer_skeyrespond(int, Buffer *);
113 int mm_answer_keyallowed(int, Buffer *);
114 int mm_answer_keyverify(int, Buffer *);
115 int mm_answer_pty(int, Buffer *);
116 int mm_answer_pty_cleanup(int, Buffer *);
117 int mm_answer_term(int, Buffer *);
118 int mm_answer_rsa_keyallowed(int, Buffer *);
119 int mm_answer_rsa_challenge(int, Buffer *);
120 int mm_answer_rsa_response(int, Buffer *);
121 int mm_answer_sesskey(int, Buffer *);
122 int mm_answer_sessid(int, Buffer *);
125 int mm_answer_pam_start(int, Buffer *);
126 int mm_answer_pam_account(int, Buffer *);
127 int mm_answer_pam_init_ctx(int, Buffer *);
128 int mm_answer_pam_query(int, Buffer *);
129 int mm_answer_pam_respond(int, Buffer *);
130 int mm_answer_pam_free_ctx(int, Buffer *);
134 int mm_answer_gss_setup_ctx(int, Buffer *);
135 int mm_answer_gss_accept_ctx(int, Buffer *);
136 int mm_answer_gss_userok(int, Buffer *);
137 int mm_answer_gss_checkmic(int, Buffer *);
141 int mm_answer_gss_setup_ctx(int, Buffer *);
142 int mm_answer_gss_accept_ctx(int, Buffer *);
143 int mm_answer_gss_userok(int, Buffer *);
144 int mm_answer_gss_sign(int, Buffer *);
145 int mm_answer_gss_error(int, Buffer *);
146 int mm_answer_gss_indicate_mechs(int, Buffer *);
147 int mm_answer_gss_localname(int, Buffer *);
150 static Authctxt *authctxt;
151 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
153 /* local state for key verify */
154 static u_char *key_blob = NULL;
155 static u_int key_bloblen = 0;
156 static int key_blobtype = MM_NOKEY;
157 static char *hostbased_cuser = NULL;
158 static char *hostbased_chost = NULL;
159 static char *auth_method = "unknown";
160 static u_int session_id2_len = 0;
161 static u_char *session_id2 = NULL;
162 static pid_t monitor_child_pid;
165 enum monitor_reqtype type;
167 int (*f)(int, Buffer *);
170 #define MON_ISAUTH 0x0004 /* Required for Authentication */
171 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
172 #define MON_ONCE 0x0010 /* Disable after calling */
174 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
176 #define MON_PERMIT 0x1000 /* Request is permitted */
178 struct mon_table mon_dispatch_proto20[] = {
179 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
180 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
181 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
182 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
183 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
184 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
186 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
187 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
188 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
189 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
190 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
191 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
194 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
195 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
198 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
199 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
201 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
202 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
204 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
205 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
206 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
207 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
208 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
209 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
210 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
211 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
216 struct mon_table mon_dispatch_postauth20[] = {
218 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
219 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
220 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
221 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
222 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
224 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
225 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
226 {MONITOR_REQ_PTY, 0, mm_answer_pty},
227 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
228 {MONITOR_REQ_TERM, 0, mm_answer_term},
232 struct mon_table mon_dispatch_proto15[] = {
233 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
234 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
235 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
236 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
237 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
238 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
239 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
240 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
242 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
243 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
246 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
247 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
250 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
251 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
252 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
253 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
254 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
257 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
258 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
259 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
260 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
261 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
262 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
267 struct mon_table mon_dispatch_postauth15[] = {
268 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
269 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
270 {MONITOR_REQ_TERM, 0, mm_answer_term},
274 struct mon_table *mon_dispatch;
276 /* Specifies if a certain message is allowed at the moment */
279 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
281 while (ent->f != NULL) {
282 if (ent->type == type) {
283 ent->flags &= ~MON_PERMIT;
284 ent->flags |= permit ? MON_PERMIT : 0;
292 monitor_permit_authentications(int permit)
294 struct mon_table *ent = mon_dispatch;
296 while (ent->f != NULL) {
297 if (ent->flags & MON_AUTH) {
298 ent->flags &= ~MON_PERMIT;
299 ent->flags |= permit ? MON_PERMIT : 0;
306 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
308 struct mon_table *ent;
309 int authenticated = 0;
311 debug3("preauth child monitor started");
313 authctxt = _authctxt;
314 memset(authctxt, 0, sizeof(*authctxt));
317 mon_dispatch = mon_dispatch_proto20;
319 /* Permit requests for moduli and signatures */
320 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
321 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
323 /* and for the GSSAPI key exchange */
324 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
325 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
326 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
329 mon_dispatch = mon_dispatch_proto15;
331 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
334 /* The first few requests do not require asynchronous access */
335 while (!authenticated) {
336 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
338 if (!(ent->flags & MON_AUTHDECIDE))
339 fatal("%s: unexpected authentication from %d",
340 __func__, ent->type);
341 if (authctxt->pw->pw_uid == 0 &&
342 !auth_root_allowed(auth_method))
345 /* PAM needs to perform account checks after auth */
346 if (options.use_pam && authenticated) {
350 mm_request_receive_expect(pmonitor->m_sendfd,
351 MONITOR_REQ_PAM_ACCOUNT, &m);
352 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
358 if (ent->flags & MON_AUTHDECIDE) {
359 auth_log(authctxt, authenticated, auth_method,
360 compat20 ? " ssh2" : "");
362 authctxt->failures++;
366 if (!authctxt->valid)
367 fatal("%s: authenticated invalid user", __func__);
369 debug("%s: %s has been authenticated by privileged process",
370 __func__, authctxt->user);
372 mm_get_keystate(pmonitor);
376 monitor_set_child_handler(pid_t pid)
378 monitor_child_pid = pid;
382 monitor_child_handler(int signal)
384 kill(monitor_child_pid, signal);
388 monitor_child_postauth(struct monitor *pmonitor)
390 monitor_set_child_handler(pmonitor->m_pid);
391 signal(SIGHUP, &monitor_child_handler);
392 signal(SIGTERM, &monitor_child_handler);
395 mon_dispatch = mon_dispatch_postauth20;
397 /* Permit requests for moduli and signatures */
398 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
399 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
400 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
403 /* and for the GSSAPI key exchange */
404 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
405 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
406 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
410 mon_dispatch = mon_dispatch_postauth15;
411 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
414 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
417 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
418 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
422 monitor_read(pmonitor, mon_dispatch, NULL);
426 monitor_sync(struct monitor *pmonitor)
428 if (options.compression) {
429 /* The member allocation is not visible, so sync it */
430 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
435 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
436 struct mon_table **pent)
444 mm_request_receive(pmonitor->m_sendfd, &m);
445 type = buffer_get_char(&m);
447 debug3("%s: checking request %d", __func__, type);
449 while (ent->f != NULL) {
450 if (ent->type == type)
455 if (ent->f != NULL) {
456 if (!(ent->flags & MON_PERMIT))
457 fatal("%s: unpermitted request %d", __func__,
459 ret = (*ent->f)(pmonitor->m_sendfd, &m);
462 /* The child may use this request only once, disable it */
463 if (ent->flags & MON_ONCE) {
464 debug2("%s: %d used once, disabling now", __func__,
466 ent->flags &= ~MON_PERMIT;
475 fatal("%s: unsupported request: %d", __func__, type);
481 /* allowed key state */
483 monitor_allowed_key(u_char *blob, u_int bloblen)
485 /* make sure key is allowed */
486 if (key_blob == NULL || key_bloblen != bloblen ||
487 memcmp(key_blob, blob, key_bloblen))
493 monitor_reset_key_state(void)
496 if (key_blob != NULL)
498 if (hostbased_cuser != NULL)
499 xfree(hostbased_cuser);
500 if (hostbased_chost != NULL)
501 xfree(hostbased_chost);
504 key_blobtype = MM_NOKEY;
505 hostbased_cuser = NULL;
506 hostbased_chost = NULL;
510 mm_answer_moduli(int socket, Buffer *m)
515 min = buffer_get_int(m);
516 want = buffer_get_int(m);
517 max = buffer_get_int(m);
519 debug3("%s: got parameters: %d %d %d",
520 __func__, min, want, max);
521 /* We need to check here, too, in case the child got corrupted */
522 if (max < min || want < min || max < want)
523 fatal("%s: bad parameters: %d %d %d",
524 __func__, min, want, max);
528 dh = choose_dh(min, want, max);
530 buffer_put_char(m, 0);
533 /* Send first bignum */
534 buffer_put_char(m, 1);
535 buffer_put_bignum2(m, dh->p);
536 buffer_put_bignum2(m, dh->g);
540 mm_request_send(socket, MONITOR_ANS_MODULI, m);
545 mm_answer_sign(int socket, Buffer *m)
550 u_int siglen, datlen;
553 debug3("%s", __func__);
555 keyid = buffer_get_int(m);
556 p = buffer_get_string(m, &datlen);
559 fatal("%s: data length incorrect: %u", __func__, datlen);
561 /* save session id, it will be passed on the first call */
562 if (session_id2_len == 0) {
563 session_id2_len = datlen;
564 session_id2 = xmalloc(session_id2_len);
565 memcpy(session_id2, p, session_id2_len);
568 if ((key = get_hostkey_by_index(keyid)) == NULL)
569 fatal("%s: no hostkey from index %d", __func__, keyid);
570 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
571 fatal("%s: key_sign failed", __func__);
573 debug3("%s: signature %p(%u)", __func__, signature, siglen);
576 buffer_put_string(m, signature, siglen);
581 mm_request_send(socket, MONITOR_ANS_SIGN, m);
583 /* Turn on permissions for getpwnam */
584 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
589 /* Retrieves the password entry and also checks if the user is permitted */
592 mm_answer_pwnamallow(int socket, Buffer *m)
595 struct passwd *pwent;
598 debug3("%s", __func__);
600 login = buffer_get_string(m, NULL);
602 pwent = getpwnamallow(login);
604 if (authctxt->user) xfree(authctxt->user);
605 authctxt->user = xstrdup(login);
606 setproctitle("%s [priv]", pwent ? login : "unknown");
612 buffer_put_char(m, 0);
613 authctxt->pw = fakepw();
618 authctxt->pw = pwent;
621 buffer_put_char(m, 1);
622 buffer_put_string(m, pwent, sizeof(struct passwd));
623 buffer_put_cstring(m, pwent->pw_name);
624 buffer_put_cstring(m, "*");
625 buffer_put_cstring(m, pwent->pw_gecos);
626 #ifdef HAVE_PW_CLASS_IN_PASSWD
627 buffer_put_cstring(m, pwent->pw_class);
629 buffer_put_cstring(m, pwent->pw_dir);
630 buffer_put_cstring(m, pwent->pw_shell);
633 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
634 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
636 /* For SSHv1 allow authentication now */
638 monitor_permit_authentications(1);
640 /* Allow service/style information on the auth context */
641 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
642 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
647 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
653 int mm_answer_auth2_read_banner(int socket, Buffer *m)
658 banner = auth2_read_banner();
659 buffer_put_cstring(m, banner != NULL ? banner : "");
660 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
669 mm_answer_authserv(int socket, Buffer *m)
671 monitor_permit_authentications(1);
673 authctxt->service = buffer_get_string(m, NULL);
674 authctxt->style = buffer_get_string(m, NULL);
675 debug3("%s: service=%s, style=%s",
676 __func__, authctxt->service, authctxt->style);
678 if (strlen(authctxt->style) == 0) {
679 xfree(authctxt->style);
680 authctxt->style = NULL;
687 mm_answer_authpassword(int socket, Buffer *m)
689 static int call_count;
694 passwd = buffer_get_string(m, &plen);
695 /* Only authenticate if the context is valid */
696 authenticated = options.password_authentication &&
697 auth_password(authctxt, passwd);
698 memset(passwd, 0, strlen(passwd));
702 buffer_put_int(m, authenticated);
704 debug3("%s: sending result %d", __func__, authenticated);
705 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
708 if (plen == 0 && call_count == 1)
709 auth_method = "none";
711 auth_method = "password";
713 /* Causes monitor loop to terminate if authenticated */
714 return (authenticated);
719 mm_answer_bsdauthquery(int socket, Buffer *m)
721 char *name, *infotxt;
727 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
728 &prompts, &echo_on) < 0 ? 0 : 1;
731 buffer_put_int(m, success);
733 buffer_put_cstring(m, prompts[0]);
735 debug3("%s: sending challenge success: %u", __func__, success);
736 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
749 mm_answer_bsdauthrespond(int socket, Buffer *m)
754 if (authctxt->as == 0)
755 fatal("%s: no bsd auth session", __func__);
757 response = buffer_get_string(m, NULL);
758 authok = options.challenge_response_authentication &&
759 auth_userresponse(authctxt->as, response, 0);
761 debug3("%s: <%s> = <%d>", __func__, response, authok);
765 buffer_put_int(m, authok);
767 debug3("%s: sending authenticated: %d", __func__, authok);
768 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
770 auth_method = "bsdauth";
772 return (authok != 0);
778 mm_answer_skeyquery(int socket, Buffer *m)
781 char challenge[1024];
784 success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1;
787 buffer_put_int(m, success);
789 buffer_put_cstring(m, challenge);
791 debug3("%s: sending challenge success: %u", __func__, success);
792 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
798 mm_answer_skeyrespond(int socket, Buffer *m)
803 response = buffer_get_string(m, NULL);
805 authok = (options.challenge_response_authentication &&
807 skey_haskey(authctxt->pw->pw_name) == 0 &&
808 skey_passcheck(authctxt->pw->pw_name, response) != -1);
813 buffer_put_int(m, authok);
815 debug3("%s: sending authenticated: %d", __func__, authok);
816 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
818 auth_method = "skey";
820 return (authok != 0);
826 mm_answer_pam_start(int socket, Buffer *m)
830 if (!options.use_pam)
831 fatal("UsePAM not set, but ended up in %s anyway", __func__);
833 user = buffer_get_string(m, NULL);
839 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
845 mm_answer_pam_account(int socket, Buffer *m)
849 if (!options.use_pam)
850 fatal("UsePAM not set, but ended up in %s anyway", __func__);
852 ret = do_pam_account();
854 buffer_put_int(m, ret);
856 mm_request_send(socket, MONITOR_ANS_PAM_ACCOUNT, m);
861 static void *sshpam_ctxt, *sshpam_authok;
862 extern KbdintDevice sshpam_device;
865 mm_answer_pam_init_ctx(int socket, Buffer *m)
868 debug3("%s", __func__);
869 authctxt->user = buffer_get_string(m, NULL);
870 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
871 sshpam_authok = NULL;
873 if (sshpam_ctxt != NULL) {
874 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
875 buffer_put_int(m, 1);
877 buffer_put_int(m, 0);
879 mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m);
884 mm_answer_pam_query(int socket, Buffer *m)
886 char *name, *info, **prompts;
890 debug3("%s", __func__);
891 sshpam_authok = NULL;
892 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
893 if (ret == 0 && num == 0)
894 sshpam_authok = sshpam_ctxt;
895 if (num > 1 || name == NULL || info == NULL)
898 buffer_put_int(m, ret);
899 buffer_put_cstring(m, name);
901 buffer_put_cstring(m, info);
903 buffer_put_int(m, num);
904 for (i = 0; i < num; ++i) {
905 buffer_put_cstring(m, prompts[i]);
907 buffer_put_int(m, echo_on[i]);
913 mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m);
918 mm_answer_pam_respond(int socket, Buffer *m)
924 debug3("%s", __func__);
925 sshpam_authok = NULL;
926 num = buffer_get_int(m);
928 resp = xmalloc(num * sizeof(char *));
929 for (i = 0; i < num; ++i)
930 resp[i] = buffer_get_string(m, NULL);
931 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
932 for (i = 0; i < num; ++i)
936 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
939 buffer_put_int(m, ret);
940 mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m);
941 auth_method = "keyboard-interactive/pam";
943 sshpam_authok = sshpam_ctxt;
948 mm_answer_pam_free_ctx(int socket, Buffer *m)
951 debug3("%s", __func__);
952 (sshpam_device.free_ctx)(sshpam_ctxt);
954 mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m);
955 return (sshpam_authok == sshpam_ctxt);
960 mm_append_debug(Buffer *m)
962 if (auth_debug_init && buffer_len(&auth_debug)) {
963 debug3("%s: Appending debug messages for child", __func__);
964 buffer_append(m, buffer_ptr(&auth_debug),
965 buffer_len(&auth_debug));
966 buffer_clear(&auth_debug);
971 mm_answer_keyallowed(int socket, Buffer *m)
977 enum mm_keytype type = 0;
980 debug3("%s entering", __func__);
982 type = buffer_get_int(m);
983 cuser = buffer_get_string(m, NULL);
984 chost = buffer_get_string(m, NULL);
985 blob = buffer_get_string(m, &bloblen);
987 key = key_from_blob(blob, bloblen);
989 if ((compat20 && type == MM_RSAHOSTKEY) ||
990 (!compat20 && type != MM_RSAHOSTKEY))
991 fatal("%s: key type and protocol mismatch", __func__);
993 debug3("%s: key_from_blob: %p", __func__, key);
995 if (key != NULL && authctxt->valid) {
998 allowed = options.pubkey_authentication &&
999 user_key_allowed(authctxt->pw, key);
1002 allowed = options.hostbased_authentication &&
1003 hostbased_key_allowed(authctxt->pw,
1007 key->type = KEY_RSA1; /* XXX */
1008 allowed = options.rhosts_rsa_authentication &&
1009 auth_rhosts_rsa_key_allowed(authctxt->pw,
1013 fatal("%s: unknown key type %d", __func__, type);
1020 /* clear temporarily storage (used by verify) */
1021 monitor_reset_key_state();
1024 /* Save temporarily for comparison in verify */
1026 key_bloblen = bloblen;
1027 key_blobtype = type;
1028 hostbased_cuser = cuser;
1029 hostbased_chost = chost;
1032 debug3("%s: key %p is %s",
1033 __func__, key, allowed ? "allowed" : "disallowed");
1036 buffer_put_int(m, allowed);
1037 buffer_put_int(m, forced_command != NULL);
1041 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
1043 if (type == MM_RSAHOSTKEY)
1044 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1050 monitor_valid_userblob(u_char *data, u_int datalen)
1058 buffer_append(&b, data, datalen);
1060 if (datafellows & SSH_OLD_SESSIONID) {
1062 len = buffer_len(&b);
1063 if ((session_id2 == NULL) ||
1064 (len < session_id2_len) ||
1065 (memcmp(p, session_id2, session_id2_len) != 0))
1067 buffer_consume(&b, session_id2_len);
1069 p = buffer_get_string(&b, &len);
1070 if ((session_id2 == NULL) ||
1071 (len != session_id2_len) ||
1072 (memcmp(p, session_id2, session_id2_len) != 0))
1076 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1078 p = buffer_get_string(&b, NULL);
1079 if (strcmp(authctxt->user, p) != 0) {
1080 logit("wrong user name passed to monitor: expected %s != %.100s",
1085 buffer_skip_string(&b);
1086 if (datafellows & SSH_BUG_PKAUTH) {
1087 if (!buffer_get_char(&b))
1090 p = buffer_get_string(&b, NULL);
1091 if (strcmp("publickey", p) != 0)
1094 if (!buffer_get_char(&b))
1096 buffer_skip_string(&b);
1098 buffer_skip_string(&b);
1099 if (buffer_len(&b) != 0)
1106 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1115 buffer_append(&b, data, datalen);
1117 p = buffer_get_string(&b, &len);
1118 if ((session_id2 == NULL) ||
1119 (len != session_id2_len) ||
1120 (memcmp(p, session_id2, session_id2_len) != 0))
1124 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1126 p = buffer_get_string(&b, NULL);
1127 if (strcmp(authctxt->user, p) != 0) {
1128 logit("wrong user name passed to monitor: expected %s != %.100s",
1133 buffer_skip_string(&b); /* service */
1134 p = buffer_get_string(&b, NULL);
1135 if (strcmp(p, "hostbased") != 0)
1138 buffer_skip_string(&b); /* pkalg */
1139 buffer_skip_string(&b); /* pkblob */
1141 /* verify client host, strip trailing dot if necessary */
1142 p = buffer_get_string(&b, NULL);
1143 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1145 if (strcmp(p, chost) != 0)
1149 /* verify client user */
1150 p = buffer_get_string(&b, NULL);
1151 if (strcmp(p, cuser) != 0)
1155 if (buffer_len(&b) != 0)
1162 mm_answer_keyverify(int socket, Buffer *m)
1165 u_char *signature, *data, *blob;
1166 u_int signaturelen, datalen, bloblen;
1170 blob = buffer_get_string(m, &bloblen);
1171 signature = buffer_get_string(m, &signaturelen);
1172 data = buffer_get_string(m, &datalen);
1174 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1175 !monitor_allowed_key(blob, bloblen))
1176 fatal("%s: bad key, not previously allowed", __func__);
1178 key = key_from_blob(blob, bloblen);
1180 fatal("%s: bad public key blob", __func__);
1182 switch (key_blobtype) {
1184 valid_data = monitor_valid_userblob(data, datalen);
1187 valid_data = monitor_valid_hostbasedblob(data, datalen,
1188 hostbased_cuser, hostbased_chost);
1195 fatal("%s: bad signature data blob", __func__);
1197 verified = key_verify(key, signature, signaturelen, data, datalen);
1198 debug3("%s: key %p signature %s",
1199 __func__, key, verified ? "verified" : "unverified");
1206 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1208 monitor_reset_key_state();
1211 buffer_put_int(m, verified);
1212 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1218 mm_record_login(Session *s, struct passwd *pw)
1221 struct sockaddr_storage from;
1224 * Get IP address of client. If the connection is not a socket, let
1225 * the address be 0.0.0.0.
1227 memset(&from, 0, sizeof(from));
1228 fromlen = sizeof(from);
1229 if (packet_connection_is_on_socket()) {
1230 if (getpeername(packet_get_connection_in(),
1231 (struct sockaddr *) & from, &fromlen) < 0) {
1232 debug("getpeername: %.100s", strerror(errno));
1236 /* Record that there was a login on that tty from the remote host. */
1237 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1238 get_remote_name_or_ip(utmp_len, options.use_dns),
1239 (struct sockaddr *)&from, fromlen);
1243 mm_session_close(Session *s)
1245 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1246 if (s->ttyfd != -1) {
1247 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1248 session_pty_cleanup2(s);
1254 mm_answer_pty(int socket, Buffer *m)
1256 extern struct monitor *pmonitor;
1260 debug3("%s entering", __func__);
1266 s->authctxt = authctxt;
1267 s->pw = authctxt->pw;
1268 s->pid = pmonitor->m_pid;
1269 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1272 pty_setowner(authctxt->pw, s->tty);
1274 buffer_put_int(m, 1);
1275 buffer_put_cstring(m, s->tty);
1276 mm_request_send(socket, MONITOR_ANS_PTY, m);
1278 mm_send_fd(socket, s->ptyfd);
1279 mm_send_fd(socket, s->ttyfd);
1281 /* We need to trick ttyslot */
1282 if (dup2(s->ttyfd, 0) == -1)
1283 fatal("%s: dup2", __func__);
1285 mm_record_login(s, authctxt->pw);
1287 /* Now we can close the file descriptor again */
1290 /* make sure nothing uses fd 0 */
1291 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1292 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1294 error("%s: fd0 %d != 0", __func__, fd0);
1296 /* slave is not needed */
1298 s->ttyfd = s->ptyfd;
1299 /* no need to dup() because nobody closes ptyfd */
1300 s->ptymaster = s->ptyfd;
1302 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1308 mm_session_close(s);
1309 buffer_put_int(m, 0);
1310 mm_request_send(socket, MONITOR_ANS_PTY, m);
1315 mm_answer_pty_cleanup(int socket, Buffer *m)
1320 debug3("%s entering", __func__);
1322 tty = buffer_get_string(m, NULL);
1323 if ((s = session_by_tty(tty)) != NULL)
1324 mm_session_close(s);
1331 mm_answer_sesskey(int socket, Buffer *m)
1336 /* Turn off permissions */
1337 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1339 if ((p = BN_new()) == NULL)
1340 fatal("%s: BN_new", __func__);
1342 buffer_get_bignum2(m, p);
1344 rsafail = ssh1_session_key(p);
1347 buffer_put_int(m, rsafail);
1348 buffer_put_bignum2(m, p);
1352 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1354 /* Turn on permissions for sessid passing */
1355 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1361 mm_answer_sessid(int socket, Buffer *m)
1365 debug3("%s entering", __func__);
1367 if (buffer_len(m) != 16)
1368 fatal("%s: bad ssh1 session id", __func__);
1369 for (i = 0; i < 16; i++)
1370 session_id[i] = buffer_get_char(m);
1372 /* Turn on permissions for getpwnam */
1373 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1379 mm_answer_rsa_keyallowed(int socket, Buffer *m)
1383 u_char *blob = NULL;
1387 debug3("%s entering", __func__);
1389 if (options.rsa_authentication && authctxt->valid) {
1390 if ((client_n = BN_new()) == NULL)
1391 fatal("%s: BN_new", __func__);
1392 buffer_get_bignum2(m, client_n);
1393 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1394 BN_clear_free(client_n);
1397 buffer_put_int(m, allowed);
1398 buffer_put_int(m, forced_command != NULL);
1400 /* clear temporarily storage (used by generate challenge) */
1401 monitor_reset_key_state();
1403 if (allowed && key != NULL) {
1404 key->type = KEY_RSA; /* cheat for key_to_blob */
1405 if (key_to_blob(key, &blob, &blen) == 0)
1406 fatal("%s: key_to_blob failed", __func__);
1407 buffer_put_string(m, blob, blen);
1409 /* Save temporarily for comparison in verify */
1412 key_blobtype = MM_RSAUSERKEY;
1419 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1421 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1422 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1427 mm_answer_rsa_challenge(int socket, Buffer *m)
1433 debug3("%s entering", __func__);
1435 if (!authctxt->valid)
1436 fatal("%s: authctxt not valid", __func__);
1437 blob = buffer_get_string(m, &blen);
1438 if (!monitor_allowed_key(blob, blen))
1439 fatal("%s: bad key, not previously allowed", __func__);
1440 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1441 fatal("%s: key type mismatch", __func__);
1442 if ((key = key_from_blob(blob, blen)) == NULL)
1443 fatal("%s: received bad key", __func__);
1446 BN_clear_free(ssh1_challenge);
1447 ssh1_challenge = auth_rsa_generate_challenge(key);
1450 buffer_put_bignum2(m, ssh1_challenge);
1452 debug3("%s sending reply", __func__);
1453 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1455 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1463 mm_answer_rsa_response(int socket, Buffer *m)
1466 u_char *blob, *response;
1470 debug3("%s entering", __func__);
1472 if (!authctxt->valid)
1473 fatal("%s: authctxt not valid", __func__);
1474 if (ssh1_challenge == NULL)
1475 fatal("%s: no ssh1_challenge", __func__);
1477 blob = buffer_get_string(m, &blen);
1478 if (!monitor_allowed_key(blob, blen))
1479 fatal("%s: bad key, not previously allowed", __func__);
1480 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1481 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1482 if ((key = key_from_blob(blob, blen)) == NULL)
1483 fatal("%s: received bad key", __func__);
1484 response = buffer_get_string(m, &len);
1486 fatal("%s: received bad response to challenge", __func__);
1487 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1493 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1496 BN_clear_free(ssh1_challenge);
1497 ssh1_challenge = NULL;
1498 monitor_reset_key_state();
1501 buffer_put_int(m, success);
1502 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1508 mm_answer_term(int socket, Buffer *req)
1510 extern struct monitor *pmonitor;
1513 debug3("%s: tearing down sessions", __func__);
1515 /* The child is terminating */
1516 session_destroy_all(&mm_session_close);
1518 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1522 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1524 /* Terminate process */
1529 monitor_apply_keystate(struct monitor *pmonitor)
1532 set_newkeys(MODE_IN);
1533 set_newkeys(MODE_OUT);
1535 packet_set_protocol_flags(child_state.ssh1protoflags);
1536 packet_set_encryption_key(child_state.ssh1key,
1537 child_state.ssh1keylen, child_state.ssh1cipher);
1538 xfree(child_state.ssh1key);
1541 /* for rc4 and other stateful ciphers */
1542 packet_set_keycontext(MODE_OUT, child_state.keyout);
1543 xfree(child_state.keyout);
1544 packet_set_keycontext(MODE_IN, child_state.keyin);
1545 xfree(child_state.keyin);
1548 packet_set_iv(MODE_OUT, child_state.ivout);
1549 xfree(child_state.ivout);
1550 packet_set_iv(MODE_IN, child_state.ivin);
1551 xfree(child_state.ivin);
1554 memcpy(&incoming_stream, &child_state.incoming,
1555 sizeof(incoming_stream));
1556 memcpy(&outgoing_stream, &child_state.outgoing,
1557 sizeof(outgoing_stream));
1559 /* Update with new address */
1560 if (options.compression)
1561 mm_init_compression(pmonitor->m_zlib);
1563 /* Network I/O buffers */
1564 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1565 buffer_clear(&input);
1566 buffer_append(&input, child_state.input, child_state.ilen);
1567 memset(child_state.input, 0, child_state.ilen);
1568 xfree(child_state.input);
1570 buffer_clear(&output);
1571 buffer_append(&output, child_state.output, child_state.olen);
1572 memset(child_state.output, 0, child_state.olen);
1573 xfree(child_state.output);
1577 mm_get_kex(Buffer *m)
1583 kex = xmalloc(sizeof(*kex));
1584 memset(kex, 0, sizeof(*kex));
1585 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1586 if ((session_id2 == NULL) ||
1587 (kex->session_id_len != session_id2_len) ||
1588 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1589 fatal("mm_get_get: internal error: bad session id");
1590 kex->we_need = buffer_get_int(m);
1591 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1592 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1594 kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
1597 kex->hostkey_type = buffer_get_int(m);
1598 kex->kex_type = buffer_get_int(m);
1599 blob = buffer_get_string(m, &bloblen);
1600 buffer_init(&kex->my);
1601 buffer_append(&kex->my, blob, bloblen);
1603 blob = buffer_get_string(m, &bloblen);
1604 buffer_init(&kex->peer);
1605 buffer_append(&kex->peer, blob, bloblen);
1608 kex->flags = buffer_get_int(m);
1609 kex->client_version_string = buffer_get_string(m, NULL);
1610 kex->server_version_string = buffer_get_string(m, NULL);
1611 kex->load_host_key=&get_hostkey_by_type;
1612 kex->host_key_index=&get_hostkey_index;
1617 /* This function requries careful sanity checking */
1620 mm_get_keystate(struct monitor *pmonitor)
1624 u_int bloblen, plen;
1625 u_int32_t seqnr, packets;
1628 debug3("%s: Waiting for new keys", __func__);
1631 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1633 child_state.ssh1protoflags = buffer_get_int(&m);
1634 child_state.ssh1cipher = buffer_get_int(&m);
1635 child_state.ssh1key = buffer_get_string(&m,
1636 &child_state.ssh1keylen);
1637 child_state.ivout = buffer_get_string(&m,
1638 &child_state.ivoutlen);
1639 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1642 /* Get the Kex for rekeying */
1643 *pmonitor->m_pkex = mm_get_kex(&m);
1646 blob = buffer_get_string(&m, &bloblen);
1647 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1650 debug3("%s: Waiting for second key", __func__);
1651 blob = buffer_get_string(&m, &bloblen);
1652 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1655 /* Now get sequence numbers for the packets */
1656 seqnr = buffer_get_int(&m);
1657 blocks = buffer_get_int64(&m);
1658 packets = buffer_get_int(&m);
1659 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1660 seqnr = buffer_get_int(&m);
1661 blocks = buffer_get_int64(&m);
1662 packets = buffer_get_int(&m);
1663 packet_set_state(MODE_IN, seqnr, blocks, packets);
1666 /* Get the key context */
1667 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1668 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1670 debug3("%s: Getting compression state", __func__);
1671 /* Get compression state */
1672 p = buffer_get_string(&m, &plen);
1673 if (plen != sizeof(child_state.outgoing))
1674 fatal("%s: bad request size", __func__);
1675 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1678 p = buffer_get_string(&m, &plen);
1679 if (plen != sizeof(child_state.incoming))
1680 fatal("%s: bad request size", __func__);
1681 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1684 /* Network I/O buffers */
1685 debug3("%s: Getting Network I/O buffers", __func__);
1686 child_state.input = buffer_get_string(&m, &child_state.ilen);
1687 child_state.output = buffer_get_string(&m, &child_state.olen);
1693 /* Allocation functions for zlib */
1695 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1697 size_t len = (size_t) size * ncount;
1700 if (len == 0 || ncount > SIZE_T_MAX / size)
1701 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1703 address = mm_malloc(mm, len);
1709 mm_zfree(struct mm_master *mm, void *address)
1711 mm_free(mm, address);
1715 mm_init_compression(struct mm_master *mm)
1717 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1718 outgoing_stream.zfree = (free_func)mm_zfree;
1719 outgoing_stream.opaque = mm;
1721 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1722 incoming_stream.zfree = (free_func)mm_zfree;
1723 incoming_stream.opaque = mm;
1728 #define FD_CLOSEONEXEC(x) do { \
1729 if (fcntl(x, F_SETFD, 1) == -1) \
1730 fatal("fcntl(%d, F_SETFD)", x); \
1734 monitor_socketpair(int *pair)
1736 #ifdef HAVE_SOCKETPAIR
1737 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1738 fatal("%s: socketpair", __func__);
1740 fatal("%s: UsePrivilegeSeparation=yes not supported",
1743 FD_CLOSEONEXEC(pair[0]);
1744 FD_CLOSEONEXEC(pair[1]);
1747 #define MM_MEMSIZE 65536
1752 struct monitor *mon;
1755 mon = xmalloc(sizeof(*mon));
1758 monitor_socketpair(pair);
1760 mon->m_recvfd = pair[0];
1761 mon->m_sendfd = pair[1];
1763 /* Used to share zlib space across processes */
1764 if (options.compression) {
1765 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1766 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1768 /* Compression needs to share state across borders */
1769 mm_init_compression(mon->m_zlib);
1776 monitor_reinit(struct monitor *mon)
1780 monitor_socketpair(pair);
1782 mon->m_recvfd = pair[0];
1783 mon->m_sendfd = pair[1];
1788 mm_answer_gss_setup_ctx(int socket, Buffer *m)
1794 oid.elements = buffer_get_string(m, &len);
1797 major = ssh_gssapi_server_ctx(&gsscontext, &oid);
1799 xfree(oid.elements);
1802 buffer_put_int(m, major);
1804 mm_request_send(socket,MONITOR_ANS_GSSSETUP, m);
1806 /* Now we have a context, enable the step */
1807 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1813 mm_answer_gss_accept_ctx(int socket, Buffer *m)
1816 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1817 OM_uint32 major,minor;
1818 OM_uint32 flags = 0; /* GSI needs this */
1821 in.value = buffer_get_string(m, &len);
1823 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1827 buffer_put_int(m, major);
1828 buffer_put_string(m, out.value, out.length);
1829 buffer_put_int(m, flags);
1830 mm_request_send(socket, MONITOR_ANS_GSSSTEP, m);
1832 gss_release_buffer(&minor, &out);
1834 if (major==GSS_S_COMPLETE) {
1835 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1836 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1837 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
1838 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1844 mm_answer_gss_checkmic(int socket, Buffer *m)
1846 gss_buffer_desc gssbuf, mic;
1850 gssbuf.value = buffer_get_string(m, &len);
1851 gssbuf.length = len;
1852 mic.value = buffer_get_string(m, &len);
1855 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1857 xfree(gssbuf.value);
1861 buffer_put_int(m, ret);
1863 mm_request_send(socket, MONITOR_ANS_GSSCHECKMIC, m);
1865 if (!GSS_ERROR(ret))
1866 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1872 mm_answer_gss_userok(int socket, Buffer *m)
1876 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1879 buffer_put_int(m, authenticated);
1881 debug3("%s: sending result %d", __func__, authenticated);
1882 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
1884 auth_method="gssapi-with-mic";
1886 /* Monitor loop will terminate if authenticated */
1887 return (authenticated);
1891 mm_answer_gss_sign(int socket, Buffer *m) {
1892 gss_buffer_desc data,hash;
1893 OM_uint32 major,minor;
1895 data.value = buffer_get_string(m,&data.length);
1896 if (data.length != 16) { /* HACK - i.e. we are using SSHv1 */
1897 if (data.length != 20)
1898 fatal("%s: data length incorrect: %d", __func__, data.length);
1900 /* Save the session ID - only first time round */
1901 if (session_id2_len == 0) {
1902 session_id2_len=data.length;
1903 session_id2 = xmalloc(session_id2_len);
1904 memcpy(session_id2, data.value, session_id2_len);
1907 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1912 buffer_put_int(m, major);
1913 buffer_put_string(m, hash.value, hash.length);
1915 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1917 gss_release_buffer(&minor,&hash);
1919 /* Turn on permissions for getpwnam */
1920 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1926 mm_answer_gss_error(int socket, Buffer *m) {
1927 OM_uint32 major,minor;
1930 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
1932 buffer_put_int(m,major);
1933 buffer_put_int(m,minor);
1934 buffer_put_cstring(m,msg);
1936 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
1944 mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
1945 OM_uint32 major,minor;
1946 gss_OID_set mech_set;
1949 major=gss_indicate_mechs(&minor, &mech_set);
1952 buffer_put_int(m, major);
1953 buffer_put_int(m, mech_set->count);
1954 for (i=0; i < mech_set->count; i++) {
1955 buffer_put_string(m, mech_set->elements[i].elements,
1956 mech_set->elements[i].length);
1959 #if !defined(MECHGLUE) /* mechglue memory management bug ??? */
1960 gss_release_oid_set(&minor,&mech_set);
1963 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
1969 mm_answer_gss_localname(int socket, Buffer *m) {
1972 ssh_gssapi_localname(&name);
1976 buffer_put_cstring(m, name);
1977 debug3("%s: sending result %s", __func__, name);
1980 buffer_put_cstring(m, "");
1981 debug3("%s: sending result \"\"", __func__);
1984 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);