1 /* $OpenBSD: monitor.c,v 1.88 2006/08/12 20:46:46 miod 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.
31 #include <sys/types.h>
32 #include <sys/param.h>
33 #include <sys/socket.h>
34 #include "openbsd-compat/sys-tree.h"
53 #define skeychallenge(k, u, c) opiechallenge((k), (u), (c))
54 #define skey_haskey(u) opie_haskey((u))
55 #define skey_passcheck(u, r) opie_passverify((u), (r))
61 #include <openssl/dh.h>
72 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
75 #define TARGET_OS_MAC 1
80 #include "auth-options.h"
89 #include "monitor_mm.h"
93 #include "monitor_wrap.h"
94 #include "monitor_fdpass.h"
100 static Gssctxt *gsscontext = NULL;
104 extern ServerOptions options;
105 extern u_int utmp_len;
106 extern Newkeys *current_keys[];
107 extern z_stream incoming_stream;
108 extern z_stream outgoing_stream;
109 extern u_char session_id[];
110 extern Buffer input, output;
111 extern Buffer auth_debug;
112 extern int auth_debug_init;
113 extern Buffer loginmsg;
115 /* State exported from the child */
138 /* Functions on the monitor that answer unprivileged requests */
140 int mm_answer_moduli(int, Buffer *);
141 int mm_answer_sign(int, Buffer *);
142 int mm_answer_pwnamallow(int, Buffer *);
143 int mm_answer_auth2_read_banner(int, Buffer *);
144 int mm_answer_authserv(int, Buffer *);
145 int mm_answer_authpassword(int, Buffer *);
146 int mm_answer_bsdauthquery(int, Buffer *);
147 int mm_answer_bsdauthrespond(int, Buffer *);
148 int mm_answer_skeyquery(int, Buffer *);
149 int mm_answer_skeyrespond(int, Buffer *);
150 int mm_answer_keyallowed(int, Buffer *);
151 int mm_answer_keyverify(int, Buffer *);
152 int mm_answer_pty(int, Buffer *);
153 int mm_answer_pty_cleanup(int, Buffer *);
154 int mm_answer_term(int, Buffer *);
155 int mm_answer_rsa_keyallowed(int, Buffer *);
156 int mm_answer_rsa_challenge(int, Buffer *);
157 int mm_answer_rsa_response(int, Buffer *);
158 int mm_answer_sesskey(int, Buffer *);
159 int mm_answer_sessid(int, Buffer *);
162 int mm_answer_pam_start(int, Buffer *);
163 int mm_answer_pam_account(int, Buffer *);
164 int mm_answer_pam_init_ctx(int, Buffer *);
165 int mm_answer_pam_query(int, Buffer *);
166 int mm_answer_pam_respond(int, Buffer *);
167 int mm_answer_pam_free_ctx(int, Buffer *);
171 int mm_answer_gss_setup_ctx(int, Buffer *);
172 int mm_answer_gss_accept_ctx(int, Buffer *);
173 int mm_answer_gss_userok(int, Buffer *);
174 int mm_answer_gss_checkmic(int, Buffer *);
177 #ifdef SSH_AUDIT_EVENTS
178 int mm_answer_audit_event(int, Buffer *);
179 int mm_answer_audit_command(int, Buffer *);
182 static Authctxt *authctxt;
183 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
185 /* local state for key verify */
186 static u_char *key_blob = NULL;
187 static u_int key_bloblen = 0;
188 static int key_blobtype = MM_NOKEY;
189 static char *hostbased_cuser = NULL;
190 static char *hostbased_chost = NULL;
191 static char *auth_method = "unknown";
192 static u_int session_id2_len = 0;
193 static u_char *session_id2 = NULL;
194 static pid_t monitor_child_pid;
197 enum monitor_reqtype type;
199 int (*f)(int, Buffer *);
202 #define MON_ISAUTH 0x0004 /* Required for Authentication */
203 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
204 #define MON_ONCE 0x0010 /* Disable after calling */
205 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
207 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
209 #define MON_PERMIT 0x1000 /* Request is permitted */
211 struct mon_table mon_dispatch_proto20[] = {
212 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
213 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
214 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
215 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
216 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
217 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
219 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
220 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
221 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
222 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
223 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
224 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
226 #ifdef SSH_AUDIT_EVENTS
227 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
230 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
231 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
234 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
235 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
237 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
238 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
240 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
241 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
242 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
243 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
248 struct mon_table mon_dispatch_postauth20[] = {
249 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
250 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
251 {MONITOR_REQ_PTY, 0, mm_answer_pty},
252 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
253 {MONITOR_REQ_TERM, 0, mm_answer_term},
254 #ifdef SSH_AUDIT_EVENTS
255 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
256 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
261 struct mon_table mon_dispatch_proto15[] = {
262 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
263 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
264 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
265 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
266 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
267 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
268 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
269 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
271 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
272 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
275 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
276 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
279 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
280 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
281 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
282 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
283 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
284 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
286 #ifdef SSH_AUDIT_EVENTS
287 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
292 struct mon_table mon_dispatch_postauth15[] = {
293 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
294 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
295 {MONITOR_REQ_TERM, 0, mm_answer_term},
296 #ifdef SSH_AUDIT_EVENTS
297 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
298 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
303 struct mon_table *mon_dispatch;
305 /* Specifies if a certain message is allowed at the moment */
308 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
310 while (ent->f != NULL) {
311 if (ent->type == type) {
312 ent->flags &= ~MON_PERMIT;
313 ent->flags |= permit ? MON_PERMIT : 0;
321 monitor_permit_authentications(int permit)
323 struct mon_table *ent = mon_dispatch;
325 while (ent->f != NULL) {
326 if (ent->flags & MON_AUTH) {
327 ent->flags &= ~MON_PERMIT;
328 ent->flags |= permit ? MON_PERMIT : 0;
335 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
337 struct mon_table *ent;
338 int authenticated = 0;
340 debug3("preauth child monitor started");
342 authctxt = _authctxt;
343 memset(authctxt, 0, sizeof(*authctxt));
345 authctxt->loginmsg = &loginmsg;
348 mon_dispatch = mon_dispatch_proto20;
350 /* Permit requests for moduli and signatures */
351 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
352 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
354 mon_dispatch = mon_dispatch_proto15;
356 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
359 /* The first few requests do not require asynchronous access */
360 while (!authenticated) {
361 auth_method = "unknown";
362 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
364 if (!(ent->flags & MON_AUTHDECIDE))
365 fatal("%s: unexpected authentication from %d",
366 __func__, ent->type);
367 if (authctxt->pw->pw_uid == 0 &&
368 !auth_root_allowed(auth_method))
371 /* PAM needs to perform account checks after auth */
372 if (options.use_pam && authenticated) {
376 mm_request_receive_expect(pmonitor->m_sendfd,
377 MONITOR_REQ_PAM_ACCOUNT, &m);
378 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
384 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
385 auth_log(authctxt, authenticated, auth_method,
386 compat20 ? " ssh2" : "");
388 authctxt->failures++;
392 if (!authctxt->valid)
393 fatal("%s: authenticated invalid user", __func__);
394 if (strcmp(auth_method, "unknown") == 0)
395 fatal("%s: authentication method name unknown", __func__);
397 debug("%s: %s has been authenticated by privileged process",
398 __func__, authctxt->user);
400 mm_get_keystate(pmonitor);
404 monitor_set_child_handler(pid_t pid)
406 monitor_child_pid = pid;
410 monitor_child_handler(int sig)
412 kill(monitor_child_pid, sig);
416 monitor_child_postauth(struct monitor *pmonitor)
418 monitor_set_child_handler(pmonitor->m_pid);
419 signal(SIGHUP, &monitor_child_handler);
420 signal(SIGTERM, &monitor_child_handler);
423 mon_dispatch = mon_dispatch_postauth20;
425 /* Permit requests for moduli and signatures */
426 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
427 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
428 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
430 mon_dispatch = mon_dispatch_postauth15;
431 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
434 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
435 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
439 monitor_read(pmonitor, mon_dispatch, NULL);
443 monitor_sync(struct monitor *pmonitor)
445 if (options.compression) {
446 /* The member allocation is not visible, so sync it */
447 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
452 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
453 struct mon_table **pent)
461 mm_request_receive(pmonitor->m_sendfd, &m);
462 type = buffer_get_char(&m);
464 debug3("%s: checking request %d", __func__, type);
466 while (ent->f != NULL) {
467 if (ent->type == type)
472 if (ent->f != NULL) {
473 if (!(ent->flags & MON_PERMIT))
474 fatal("%s: unpermitted request %d", __func__,
476 ret = (*ent->f)(pmonitor->m_sendfd, &m);
479 /* The child may use this request only once, disable it */
480 if (ent->flags & MON_ONCE) {
481 debug2("%s: %d used once, disabling now", __func__,
483 ent->flags &= ~MON_PERMIT;
492 fatal("%s: unsupported request: %d", __func__, type);
498 /* allowed key state */
500 monitor_allowed_key(u_char *blob, u_int bloblen)
502 /* make sure key is allowed */
503 if (key_blob == NULL || key_bloblen != bloblen ||
504 memcmp(key_blob, blob, key_bloblen))
510 monitor_reset_key_state(void)
513 if (key_blob != NULL)
515 if (hostbased_cuser != NULL)
516 xfree(hostbased_cuser);
517 if (hostbased_chost != NULL)
518 xfree(hostbased_chost);
521 key_blobtype = MM_NOKEY;
522 hostbased_cuser = NULL;
523 hostbased_chost = NULL;
527 mm_answer_moduli(int sock, Buffer *m)
532 min = buffer_get_int(m);
533 want = buffer_get_int(m);
534 max = buffer_get_int(m);
536 debug3("%s: got parameters: %d %d %d",
537 __func__, min, want, max);
538 /* We need to check here, too, in case the child got corrupted */
539 if (max < min || want < min || max < want)
540 fatal("%s: bad parameters: %d %d %d",
541 __func__, min, want, max);
545 dh = choose_dh(min, want, max);
547 buffer_put_char(m, 0);
550 /* Send first bignum */
551 buffer_put_char(m, 1);
552 buffer_put_bignum2(m, dh->p);
553 buffer_put_bignum2(m, dh->g);
557 mm_request_send(sock, MONITOR_ANS_MODULI, m);
562 mm_answer_sign(int sock, Buffer *m)
567 u_int siglen, datlen;
570 debug3("%s", __func__);
572 keyid = buffer_get_int(m);
573 p = buffer_get_string(m, &datlen);
576 * Supported KEX types will only return SHA1 (20 byte) or
577 * SHA256 (32 byte) hashes
579 if (datlen != 20 && datlen != 32)
580 fatal("%s: data length incorrect: %u", __func__, datlen);
582 /* save session id, it will be passed on the first call */
583 if (session_id2_len == 0) {
584 session_id2_len = datlen;
585 session_id2 = xmalloc(session_id2_len);
586 memcpy(session_id2, p, session_id2_len);
589 if ((key = get_hostkey_by_index(keyid)) == NULL)
590 fatal("%s: no hostkey from index %d", __func__, keyid);
591 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
592 fatal("%s: key_sign failed", __func__);
594 debug3("%s: signature %p(%u)", __func__, signature, siglen);
597 buffer_put_string(m, signature, siglen);
602 mm_request_send(sock, MONITOR_ANS_SIGN, m);
604 /* Turn on permissions for getpwnam */
605 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
610 /* Retrieves the password entry and also checks if the user is permitted */
613 mm_answer_pwnamallow(int sock, Buffer *m)
616 struct passwd *pwent;
619 debug3("%s", __func__);
621 if (authctxt->attempt++ != 0)
622 fatal("%s: multiple attempts for getpwnam", __func__);
624 username = buffer_get_string(m, NULL);
626 pwent = getpwnamallow(username);
628 authctxt->user = xstrdup(username);
629 setproctitle("%s [priv]", pwent ? username : "unknown");
635 buffer_put_char(m, 0);
636 authctxt->pw = fakepw();
641 authctxt->pw = pwent;
644 buffer_put_char(m, 1);
645 buffer_put_string(m, pwent, sizeof(struct passwd));
646 buffer_put_cstring(m, pwent->pw_name);
647 buffer_put_cstring(m, "*");
648 buffer_put_cstring(m, pwent->pw_gecos);
649 #ifdef HAVE_PW_CLASS_IN_PASSWD
650 buffer_put_cstring(m, pwent->pw_class);
652 buffer_put_cstring(m, pwent->pw_dir);
653 buffer_put_cstring(m, pwent->pw_shell);
656 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
657 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
659 /* For SSHv1 allow authentication now */
661 monitor_permit_authentications(1);
663 /* Allow service/style information on the auth context */
664 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
665 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
670 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
676 int mm_answer_auth2_read_banner(int sock, Buffer *m)
681 banner = auth2_read_banner();
682 buffer_put_cstring(m, banner != NULL ? banner : "");
683 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
692 mm_answer_authserv(int sock, Buffer *m)
694 monitor_permit_authentications(1);
696 authctxt->service = buffer_get_string(m, NULL);
697 authctxt->style = buffer_get_string(m, NULL);
698 debug3("%s: service=%s, style=%s",
699 __func__, authctxt->service, authctxt->style);
701 if (strlen(authctxt->style) == 0) {
702 xfree(authctxt->style);
703 authctxt->style = NULL;
710 mm_answer_authpassword(int sock, Buffer *m)
712 static int call_count;
717 passwd = buffer_get_string(m, &plen);
718 /* Only authenticate if the context is valid */
719 authenticated = options.password_authentication &&
720 auth_password(authctxt, passwd);
721 memset(passwd, 0, strlen(passwd));
725 buffer_put_int(m, authenticated);
727 debug3("%s: sending result %d", __func__, authenticated);
728 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
731 if (plen == 0 && call_count == 1)
732 auth_method = "none";
734 auth_method = "password";
736 /* Causes monitor loop to terminate if authenticated */
737 return (authenticated);
742 mm_answer_bsdauthquery(int sock, Buffer *m)
744 char *name, *infotxt;
750 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
751 &prompts, &echo_on) < 0 ? 0 : 1;
754 buffer_put_int(m, success);
756 buffer_put_cstring(m, prompts[0]);
758 debug3("%s: sending challenge success: %u", __func__, success);
759 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
772 mm_answer_bsdauthrespond(int sock, Buffer *m)
777 if (authctxt->as == 0)
778 fatal("%s: no bsd auth session", __func__);
780 response = buffer_get_string(m, NULL);
781 authok = options.challenge_response_authentication &&
782 auth_userresponse(authctxt->as, response, 0);
784 debug3("%s: <%s> = <%d>", __func__, response, authok);
788 buffer_put_int(m, authok);
790 debug3("%s: sending authenticated: %d", __func__, authok);
791 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
793 auth_method = "bsdauth";
795 return (authok != 0);
801 mm_answer_skeyquery(int sock, Buffer *m)
804 char challenge[1024];
807 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
808 sizeof(challenge)) < 0 ? 0 : 1;
811 buffer_put_int(m, success);
813 buffer_put_cstring(m, challenge);
815 debug3("%s: sending challenge success: %u", __func__, success);
816 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
822 mm_answer_skeyrespond(int sock, Buffer *m)
827 response = buffer_get_string(m, NULL);
829 authok = (options.challenge_response_authentication &&
831 skey_haskey(authctxt->pw->pw_name) == 0 &&
832 skey_passcheck(authctxt->pw->pw_name, response) != -1);
837 buffer_put_int(m, authok);
839 debug3("%s: sending authenticated: %d", __func__, authok);
840 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
842 auth_method = "skey";
844 return (authok != 0);
850 mm_answer_pam_start(int sock, Buffer *m)
852 if (!options.use_pam)
853 fatal("UsePAM not set, but ended up in %s anyway", __func__);
857 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
863 mm_answer_pam_account(int sock, Buffer *m)
867 if (!options.use_pam)
868 fatal("UsePAM not set, but ended up in %s anyway", __func__);
870 ret = do_pam_account();
872 buffer_put_int(m, ret);
873 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
875 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
880 static void *sshpam_ctxt, *sshpam_authok;
881 extern KbdintDevice sshpam_device;
884 mm_answer_pam_init_ctx(int sock, Buffer *m)
887 debug3("%s", __func__);
888 authctxt->user = buffer_get_string(m, NULL);
889 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
890 sshpam_authok = NULL;
892 if (sshpam_ctxt != NULL) {
893 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
894 buffer_put_int(m, 1);
896 buffer_put_int(m, 0);
898 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
903 mm_answer_pam_query(int sock, Buffer *m)
905 char *name, *info, **prompts;
906 u_int i, num, *echo_on;
909 debug3("%s", __func__);
910 sshpam_authok = NULL;
911 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
912 if (ret == 0 && num == 0)
913 sshpam_authok = sshpam_ctxt;
914 if (num > 1 || name == NULL || info == NULL)
917 buffer_put_int(m, ret);
918 buffer_put_cstring(m, name);
920 buffer_put_cstring(m, info);
922 buffer_put_int(m, num);
923 for (i = 0; i < num; ++i) {
924 buffer_put_cstring(m, prompts[i]);
926 buffer_put_int(m, echo_on[i]);
932 auth_method = "keyboard-interactive/pam";
933 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
938 mm_answer_pam_respond(int sock, Buffer *m)
944 debug3("%s", __func__);
945 sshpam_authok = NULL;
946 num = buffer_get_int(m);
948 resp = xcalloc(num, sizeof(char *));
949 for (i = 0; i < num; ++i)
950 resp[i] = buffer_get_string(m, NULL);
951 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
952 for (i = 0; i < num; ++i)
956 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
959 buffer_put_int(m, ret);
960 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
961 auth_method = "keyboard-interactive/pam";
963 sshpam_authok = sshpam_ctxt;
968 mm_answer_pam_free_ctx(int sock, Buffer *m)
971 debug3("%s", __func__);
972 (sshpam_device.free_ctx)(sshpam_ctxt);
974 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
975 auth_method = "keyboard-interactive/pam";
976 return (sshpam_authok == sshpam_ctxt);
981 mm_append_debug(Buffer *m)
983 if (auth_debug_init && buffer_len(&auth_debug)) {
984 debug3("%s: Appending debug messages for child", __func__);
985 buffer_append(m, buffer_ptr(&auth_debug),
986 buffer_len(&auth_debug));
987 buffer_clear(&auth_debug);
992 mm_answer_keyallowed(int sock, Buffer *m)
998 enum mm_keytype type = 0;
1001 debug3("%s entering", __func__);
1003 type = buffer_get_int(m);
1004 cuser = buffer_get_string(m, NULL);
1005 chost = buffer_get_string(m, NULL);
1006 blob = buffer_get_string(m, &bloblen);
1008 key = key_from_blob(blob, bloblen);
1010 if ((compat20 && type == MM_RSAHOSTKEY) ||
1011 (!compat20 && type != MM_RSAHOSTKEY))
1012 fatal("%s: key type and protocol mismatch", __func__);
1014 debug3("%s: key_from_blob: %p", __func__, key);
1016 if (key != NULL && authctxt->valid) {
1019 allowed = options.pubkey_authentication &&
1020 user_key_allowed(authctxt->pw, key);
1021 auth_method = "publickey";
1024 allowed = options.hostbased_authentication &&
1025 hostbased_key_allowed(authctxt->pw,
1027 auth_method = "hostbased";
1030 key->type = KEY_RSA1; /* XXX */
1031 allowed = options.rhosts_rsa_authentication &&
1032 auth_rhosts_rsa_key_allowed(authctxt->pw,
1034 auth_method = "rsa";
1037 fatal("%s: unknown key type %d", __func__, type);
1044 /* clear temporarily storage (used by verify) */
1045 monitor_reset_key_state();
1048 /* Save temporarily for comparison in verify */
1050 key_bloblen = bloblen;
1051 key_blobtype = type;
1052 hostbased_cuser = cuser;
1053 hostbased_chost = chost;
1055 /* Log failed attempt */
1056 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
1062 debug3("%s: key %p is %s",
1063 __func__, key, allowed ? "allowed" : "disallowed");
1066 buffer_put_int(m, allowed);
1067 buffer_put_int(m, forced_command != NULL);
1071 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1073 if (type == MM_RSAHOSTKEY)
1074 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1080 monitor_valid_userblob(u_char *data, u_int datalen)
1088 buffer_append(&b, data, datalen);
1090 if (datafellows & SSH_OLD_SESSIONID) {
1092 len = buffer_len(&b);
1093 if ((session_id2 == NULL) ||
1094 (len < session_id2_len) ||
1095 (memcmp(p, session_id2, session_id2_len) != 0))
1097 buffer_consume(&b, session_id2_len);
1099 p = buffer_get_string(&b, &len);
1100 if ((session_id2 == NULL) ||
1101 (len != session_id2_len) ||
1102 (memcmp(p, session_id2, session_id2_len) != 0))
1106 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1108 p = buffer_get_string(&b, NULL);
1109 if (strcmp(authctxt->user, p) != 0) {
1110 logit("wrong user name passed to monitor: expected %s != %.100s",
1115 buffer_skip_string(&b);
1116 if (datafellows & SSH_BUG_PKAUTH) {
1117 if (!buffer_get_char(&b))
1120 p = buffer_get_string(&b, NULL);
1121 if (strcmp("publickey", p) != 0)
1124 if (!buffer_get_char(&b))
1126 buffer_skip_string(&b);
1128 buffer_skip_string(&b);
1129 if (buffer_len(&b) != 0)
1136 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1145 buffer_append(&b, data, datalen);
1147 p = buffer_get_string(&b, &len);
1148 if ((session_id2 == NULL) ||
1149 (len != session_id2_len) ||
1150 (memcmp(p, session_id2, session_id2_len) != 0))
1154 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1156 p = buffer_get_string(&b, NULL);
1157 if (strcmp(authctxt->user, p) != 0) {
1158 logit("wrong user name passed to monitor: expected %s != %.100s",
1163 buffer_skip_string(&b); /* service */
1164 p = buffer_get_string(&b, NULL);
1165 if (strcmp(p, "hostbased") != 0)
1168 buffer_skip_string(&b); /* pkalg */
1169 buffer_skip_string(&b); /* pkblob */
1171 /* verify client host, strip trailing dot if necessary */
1172 p = buffer_get_string(&b, NULL);
1173 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1175 if (strcmp(p, chost) != 0)
1179 /* verify client user */
1180 p = buffer_get_string(&b, NULL);
1181 if (strcmp(p, cuser) != 0)
1185 if (buffer_len(&b) != 0)
1192 mm_answer_keyverify(int sock, Buffer *m)
1195 u_char *signature, *data, *blob;
1196 u_int signaturelen, datalen, bloblen;
1200 blob = buffer_get_string(m, &bloblen);
1201 signature = buffer_get_string(m, &signaturelen);
1202 data = buffer_get_string(m, &datalen);
1204 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1205 !monitor_allowed_key(blob, bloblen))
1206 fatal("%s: bad key, not previously allowed", __func__);
1208 key = key_from_blob(blob, bloblen);
1210 fatal("%s: bad public key blob", __func__);
1212 switch (key_blobtype) {
1214 valid_data = monitor_valid_userblob(data, datalen);
1217 valid_data = monitor_valid_hostbasedblob(data, datalen,
1218 hostbased_cuser, hostbased_chost);
1225 fatal("%s: bad signature data blob", __func__);
1227 verified = key_verify(key, signature, signaturelen, data, datalen);
1228 debug3("%s: key %p signature %s",
1229 __func__, key, verified ? "verified" : "unverified");
1236 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1238 monitor_reset_key_state();
1241 buffer_put_int(m, verified);
1242 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1248 mm_record_login(Session *s, struct passwd *pw)
1251 struct sockaddr_storage from;
1254 * Get IP address of client. If the connection is not a socket, let
1255 * the address be 0.0.0.0.
1257 memset(&from, 0, sizeof(from));
1258 fromlen = sizeof(from);
1259 if (packet_connection_is_on_socket()) {
1260 if (getpeername(packet_get_connection_in(),
1261 (struct sockaddr *)&from, &fromlen) < 0) {
1262 debug("getpeername: %.100s", strerror(errno));
1266 /* Record that there was a login on that tty from the remote host. */
1267 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1268 get_remote_name_or_ip(utmp_len, options.use_dns),
1269 (struct sockaddr *)&from, fromlen);
1273 mm_session_close(Session *s)
1275 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1276 if (s->ttyfd != -1) {
1277 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1278 session_pty_cleanup2(s);
1284 mm_answer_pty(int sock, Buffer *m)
1286 extern struct monitor *pmonitor;
1290 debug3("%s entering", __func__);
1296 s->authctxt = authctxt;
1297 s->pw = authctxt->pw;
1298 s->pid = pmonitor->m_pid;
1299 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1302 pty_setowner(authctxt->pw, s->tty);
1304 buffer_put_int(m, 1);
1305 buffer_put_cstring(m, s->tty);
1307 /* We need to trick ttyslot */
1308 if (dup2(s->ttyfd, 0) == -1)
1309 fatal("%s: dup2", __func__);
1311 mm_record_login(s, authctxt->pw);
1313 /* Now we can close the file descriptor again */
1316 /* send messages generated by record_login */
1317 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1318 buffer_clear(&loginmsg);
1320 mm_request_send(sock, MONITOR_ANS_PTY, m);
1322 mm_send_fd(sock, s->ptyfd);
1323 mm_send_fd(sock, s->ttyfd);
1325 /* make sure nothing uses fd 0 */
1326 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1327 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1329 error("%s: fd0 %d != 0", __func__, fd0);
1331 /* slave is not needed */
1333 s->ttyfd = s->ptyfd;
1334 /* no need to dup() because nobody closes ptyfd */
1335 s->ptymaster = s->ptyfd;
1337 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1343 mm_session_close(s);
1344 buffer_put_int(m, 0);
1345 mm_request_send(sock, MONITOR_ANS_PTY, m);
1350 mm_answer_pty_cleanup(int sock, Buffer *m)
1355 debug3("%s entering", __func__);
1357 tty = buffer_get_string(m, NULL);
1358 if ((s = session_by_tty(tty)) != NULL)
1359 mm_session_close(s);
1366 mm_answer_sesskey(int sock, Buffer *m)
1371 /* Turn off permissions */
1372 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1374 if ((p = BN_new()) == NULL)
1375 fatal("%s: BN_new", __func__);
1377 buffer_get_bignum2(m, p);
1379 rsafail = ssh1_session_key(p);
1382 buffer_put_int(m, rsafail);
1383 buffer_put_bignum2(m, p);
1387 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1389 /* Turn on permissions for sessid passing */
1390 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1396 mm_answer_sessid(int sock, Buffer *m)
1400 debug3("%s entering", __func__);
1402 if (buffer_len(m) != 16)
1403 fatal("%s: bad ssh1 session id", __func__);
1404 for (i = 0; i < 16; i++)
1405 session_id[i] = buffer_get_char(m);
1407 /* Turn on permissions for getpwnam */
1408 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1414 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1418 u_char *blob = NULL;
1422 debug3("%s entering", __func__);
1424 auth_method = "rsa";
1425 if (options.rsa_authentication && authctxt->valid) {
1426 if ((client_n = BN_new()) == NULL)
1427 fatal("%s: BN_new", __func__);
1428 buffer_get_bignum2(m, client_n);
1429 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1430 BN_clear_free(client_n);
1433 buffer_put_int(m, allowed);
1434 buffer_put_int(m, forced_command != NULL);
1436 /* clear temporarily storage (used by generate challenge) */
1437 monitor_reset_key_state();
1439 if (allowed && key != NULL) {
1440 key->type = KEY_RSA; /* cheat for key_to_blob */
1441 if (key_to_blob(key, &blob, &blen) == 0)
1442 fatal("%s: key_to_blob failed", __func__);
1443 buffer_put_string(m, blob, blen);
1445 /* Save temporarily for comparison in verify */
1448 key_blobtype = MM_RSAUSERKEY;
1455 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1457 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1458 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1463 mm_answer_rsa_challenge(int sock, Buffer *m)
1469 debug3("%s entering", __func__);
1471 if (!authctxt->valid)
1472 fatal("%s: authctxt not valid", __func__);
1473 blob = buffer_get_string(m, &blen);
1474 if (!monitor_allowed_key(blob, blen))
1475 fatal("%s: bad key, not previously allowed", __func__);
1476 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1477 fatal("%s: key type mismatch", __func__);
1478 if ((key = key_from_blob(blob, blen)) == NULL)
1479 fatal("%s: received bad key", __func__);
1482 BN_clear_free(ssh1_challenge);
1483 ssh1_challenge = auth_rsa_generate_challenge(key);
1486 buffer_put_bignum2(m, ssh1_challenge);
1488 debug3("%s sending reply", __func__);
1489 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1491 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1499 mm_answer_rsa_response(int sock, Buffer *m)
1502 u_char *blob, *response;
1506 debug3("%s entering", __func__);
1508 if (!authctxt->valid)
1509 fatal("%s: authctxt not valid", __func__);
1510 if (ssh1_challenge == NULL)
1511 fatal("%s: no ssh1_challenge", __func__);
1513 blob = buffer_get_string(m, &blen);
1514 if (!monitor_allowed_key(blob, blen))
1515 fatal("%s: bad key, not previously allowed", __func__);
1516 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1517 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1518 if ((key = key_from_blob(blob, blen)) == NULL)
1519 fatal("%s: received bad key", __func__);
1520 response = buffer_get_string(m, &len);
1522 fatal("%s: received bad response to challenge", __func__);
1523 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1529 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1532 BN_clear_free(ssh1_challenge);
1533 ssh1_challenge = NULL;
1534 monitor_reset_key_state();
1537 buffer_put_int(m, success);
1538 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1544 mm_answer_term(int sock, Buffer *req)
1546 extern struct monitor *pmonitor;
1549 debug3("%s: tearing down sessions", __func__);
1551 /* The child is terminating */
1552 session_destroy_all(&mm_session_close);
1554 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1558 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1560 /* Terminate process */
1564 #ifdef SSH_AUDIT_EVENTS
1565 /* Report that an audit event occurred */
1567 mm_answer_audit_event(int socket, Buffer *m)
1569 ssh_audit_event_t event;
1571 debug3("%s entering", __func__);
1573 event = buffer_get_int(m);
1575 case SSH_AUTH_FAIL_PUBKEY:
1576 case SSH_AUTH_FAIL_HOSTBASED:
1577 case SSH_AUTH_FAIL_GSSAPI:
1578 case SSH_LOGIN_EXCEED_MAXTRIES:
1579 case SSH_LOGIN_ROOT_DENIED:
1580 case SSH_CONNECTION_CLOSE:
1581 case SSH_INVALID_USER:
1585 fatal("Audit event type %d not permitted", event);
1592 mm_answer_audit_command(int socket, Buffer *m)
1597 debug3("%s entering", __func__);
1598 cmd = buffer_get_string(m, &len);
1599 /* sanity check command, if so how? */
1600 audit_run_command(cmd);
1604 #endif /* SSH_AUDIT_EVENTS */
1607 monitor_apply_keystate(struct monitor *pmonitor)
1610 set_newkeys(MODE_IN);
1611 set_newkeys(MODE_OUT);
1613 packet_set_protocol_flags(child_state.ssh1protoflags);
1614 packet_set_encryption_key(child_state.ssh1key,
1615 child_state.ssh1keylen, child_state.ssh1cipher);
1616 xfree(child_state.ssh1key);
1619 /* for rc4 and other stateful ciphers */
1620 packet_set_keycontext(MODE_OUT, child_state.keyout);
1621 xfree(child_state.keyout);
1622 packet_set_keycontext(MODE_IN, child_state.keyin);
1623 xfree(child_state.keyin);
1626 packet_set_iv(MODE_OUT, child_state.ivout);
1627 xfree(child_state.ivout);
1628 packet_set_iv(MODE_IN, child_state.ivin);
1629 xfree(child_state.ivin);
1632 memcpy(&incoming_stream, &child_state.incoming,
1633 sizeof(incoming_stream));
1634 memcpy(&outgoing_stream, &child_state.outgoing,
1635 sizeof(outgoing_stream));
1637 /* Update with new address */
1638 if (options.compression)
1639 mm_init_compression(pmonitor->m_zlib);
1641 /* Network I/O buffers */
1642 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1643 buffer_clear(&input);
1644 buffer_append(&input, child_state.input, child_state.ilen);
1645 memset(child_state.input, 0, child_state.ilen);
1646 xfree(child_state.input);
1648 buffer_clear(&output);
1649 buffer_append(&output, child_state.output, child_state.olen);
1650 memset(child_state.output, 0, child_state.olen);
1651 xfree(child_state.output);
1655 mm_get_kex(Buffer *m)
1661 kex = xcalloc(1, sizeof(*kex));
1662 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1663 if ((session_id2 == NULL) ||
1664 (kex->session_id_len != session_id2_len) ||
1665 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1666 fatal("mm_get_get: internal error: bad session id");
1667 kex->we_need = buffer_get_int(m);
1668 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1669 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1670 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1671 kex->kex[KEX_DH_GEX_SHA256] = kexgex_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 = xcalloc(1, sizeof(*mon));
1833 monitor_socketpair(pair);
1835 mon->m_recvfd = pair[0];
1836 mon->m_sendfd = pair[1];
1838 /* Used to share zlib space across processes */
1839 if (options.compression) {
1840 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1841 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1843 /* Compression needs to share state across borders */
1844 mm_init_compression(mon->m_zlib);
1851 monitor_reinit(struct monitor *mon)
1855 monitor_socketpair(pair);
1857 mon->m_recvfd = pair[0];
1858 mon->m_sendfd = pair[1];
1863 mm_answer_gss_setup_ctx(int sock, Buffer *m)
1869 goid.elements = buffer_get_string(m, &len);
1872 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1874 xfree(goid.elements);
1877 buffer_put_int(m, major);
1879 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1881 /* Now we have a context, enable the step */
1882 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1888 mm_answer_gss_accept_ctx(int sock, Buffer *m)
1891 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1892 OM_uint32 major, minor;
1893 OM_uint32 flags = 0; /* GSI needs this */
1896 in.value = buffer_get_string(m, &len);
1898 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1902 buffer_put_int(m, major);
1903 buffer_put_string(m, out.value, out.length);
1904 buffer_put_int(m, flags);
1905 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1907 gss_release_buffer(&minor, &out);
1909 if (major == GSS_S_COMPLETE) {
1910 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1911 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1912 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1918 mm_answer_gss_checkmic(int sock, Buffer *m)
1920 gss_buffer_desc gssbuf, mic;
1924 gssbuf.value = buffer_get_string(m, &len);
1925 gssbuf.length = len;
1926 mic.value = buffer_get_string(m, &len);
1929 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1931 xfree(gssbuf.value);
1935 buffer_put_int(m, ret);
1937 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1939 if (!GSS_ERROR(ret))
1940 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1946 mm_answer_gss_userok(int sock, Buffer *m)
1950 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1953 buffer_put_int(m, authenticated);
1955 debug3("%s: sending result %d", __func__, authenticated);
1956 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1958 auth_method = "gssapi-with-mic";
1960 /* Monitor loop will terminate if authenticated */
1961 return (authenticated);