1 /* $OpenBSD: monitor.c,v 1.76 2006/03/25 13:17:02 djm 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>
42 #include <openssl/dh.h>
48 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
51 #define TARGET_OS_MAC 1
56 #include "auth-options.h"
65 #include "monitor_mm.h"
66 #include "monitor_wrap.h"
67 #include "monitor_fdpass.h"
77 static Gssctxt *gsscontext = NULL;
81 extern ServerOptions options;
82 extern u_int utmp_len;
83 extern Newkeys *current_keys[];
84 extern z_stream incoming_stream;
85 extern z_stream outgoing_stream;
86 extern u_char session_id[];
87 extern Buffer input, output;
88 extern Buffer auth_debug;
89 extern int auth_debug_init;
90 extern Buffer loginmsg;
92 /* State exported from the child */
115 /* Functions on the monitor that answer unprivileged requests */
117 int mm_answer_moduli(int, Buffer *);
118 int mm_answer_sign(int, Buffer *);
119 int mm_answer_pwnamallow(int, Buffer *);
120 int mm_answer_auth2_read_banner(int, Buffer *);
121 int mm_answer_authserv(int, Buffer *);
122 int mm_answer_authpassword(int, Buffer *);
123 int mm_answer_bsdauthquery(int, Buffer *);
124 int mm_answer_bsdauthrespond(int, Buffer *);
125 int mm_answer_skeyquery(int, Buffer *);
126 int mm_answer_skeyrespond(int, Buffer *);
127 int mm_answer_keyallowed(int, Buffer *);
128 int mm_answer_keyverify(int, Buffer *);
129 int mm_answer_pty(int, Buffer *);
130 int mm_answer_pty_cleanup(int, Buffer *);
131 int mm_answer_term(int, Buffer *);
132 int mm_answer_rsa_keyallowed(int, Buffer *);
133 int mm_answer_rsa_challenge(int, Buffer *);
134 int mm_answer_rsa_response(int, Buffer *);
135 int mm_answer_sesskey(int, Buffer *);
136 int mm_answer_sessid(int, Buffer *);
139 int mm_answer_pam_start(int, Buffer *);
140 int mm_answer_pam_account(int, Buffer *);
141 int mm_answer_pam_init_ctx(int, Buffer *);
142 int mm_answer_pam_query(int, Buffer *);
143 int mm_answer_pam_respond(int, Buffer *);
144 int mm_answer_pam_free_ctx(int, Buffer *);
148 int mm_answer_gss_setup_ctx(int, Buffer *);
149 int mm_answer_gss_accept_ctx(int, Buffer *);
150 int mm_answer_gss_userok(int, Buffer *);
151 int mm_answer_gss_checkmic(int, Buffer *);
154 #ifdef SSH_AUDIT_EVENTS
155 int mm_answer_audit_event(int, Buffer *);
156 int mm_answer_audit_command(int, Buffer *);
159 static Authctxt *authctxt;
160 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
162 /* local state for key verify */
163 static u_char *key_blob = NULL;
164 static u_int key_bloblen = 0;
165 static int key_blobtype = MM_NOKEY;
166 static char *hostbased_cuser = NULL;
167 static char *hostbased_chost = NULL;
168 static char *auth_method = "unknown";
169 static u_int session_id2_len = 0;
170 static u_char *session_id2 = NULL;
171 static pid_t monitor_child_pid;
174 enum monitor_reqtype type;
176 int (*f)(int, Buffer *);
179 #define MON_ISAUTH 0x0004 /* Required for Authentication */
180 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
181 #define MON_ONCE 0x0010 /* Disable after calling */
183 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
185 #define MON_PERMIT 0x1000 /* Request is permitted */
187 struct mon_table mon_dispatch_proto20[] = {
188 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
189 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
190 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
191 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
192 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
193 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
195 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
196 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
197 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
198 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
199 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
200 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
202 #ifdef SSH_AUDIT_EVENTS
203 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
206 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
207 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
210 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
211 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
213 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
214 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
216 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
217 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
218 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
219 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
224 struct mon_table mon_dispatch_postauth20[] = {
225 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
226 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
227 {MONITOR_REQ_PTY, 0, mm_answer_pty},
228 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
229 {MONITOR_REQ_TERM, 0, mm_answer_term},
230 #ifdef SSH_AUDIT_EVENTS
231 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
232 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
237 struct mon_table mon_dispatch_proto15[] = {
238 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
239 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
240 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
241 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
242 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
243 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
244 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
245 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
247 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
248 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
251 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
252 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
255 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
256 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
257 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
258 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
259 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
260 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
262 #ifdef SSH_AUDIT_EVENTS
263 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
268 struct mon_table mon_dispatch_postauth15[] = {
269 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
270 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
271 {MONITOR_REQ_TERM, 0, mm_answer_term},
272 #ifdef SSH_AUDIT_EVENTS
273 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
274 {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command},
279 struct mon_table *mon_dispatch;
281 /* Specifies if a certain message is allowed at the moment */
284 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
286 while (ent->f != NULL) {
287 if (ent->type == type) {
288 ent->flags &= ~MON_PERMIT;
289 ent->flags |= permit ? MON_PERMIT : 0;
297 monitor_permit_authentications(int permit)
299 struct mon_table *ent = mon_dispatch;
301 while (ent->f != NULL) {
302 if (ent->flags & MON_AUTH) {
303 ent->flags &= ~MON_PERMIT;
304 ent->flags |= permit ? MON_PERMIT : 0;
311 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
313 struct mon_table *ent;
314 int authenticated = 0;
316 debug3("preauth child monitor started");
318 authctxt = _authctxt;
319 memset(authctxt, 0, sizeof(*authctxt));
321 authctxt->loginmsg = &loginmsg;
324 mon_dispatch = mon_dispatch_proto20;
326 /* Permit requests for moduli and signatures */
327 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
328 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
330 mon_dispatch = mon_dispatch_proto15;
332 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
335 /* The first few requests do not require asynchronous access */
336 while (!authenticated) {
337 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
339 if (!(ent->flags & MON_AUTHDECIDE))
340 fatal("%s: unexpected authentication from %d",
341 __func__, ent->type);
342 if (authctxt->pw->pw_uid == 0 &&
343 !auth_root_allowed(auth_method))
346 /* PAM needs to perform account checks after auth */
347 if (options.use_pam && authenticated) {
351 mm_request_receive_expect(pmonitor->m_sendfd,
352 MONITOR_REQ_PAM_ACCOUNT, &m);
353 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
359 if (ent->flags & MON_AUTHDECIDE) {
360 auth_log(authctxt, authenticated, auth_method,
361 compat20 ? " ssh2" : "");
363 authctxt->failures++;
367 if (!authctxt->valid)
368 fatal("%s: authenticated invalid user", __func__);
370 debug("%s: %s has been authenticated by privileged process",
371 __func__, authctxt->user);
373 mm_get_keystate(pmonitor);
377 monitor_set_child_handler(pid_t pid)
379 monitor_child_pid = pid;
383 monitor_child_handler(int sig)
385 kill(monitor_child_pid, sig);
389 monitor_child_postauth(struct monitor *pmonitor)
391 monitor_set_child_handler(pmonitor->m_pid);
392 signal(SIGHUP, &monitor_child_handler);
393 signal(SIGTERM, &monitor_child_handler);
396 mon_dispatch = mon_dispatch_postauth20;
398 /* Permit requests for moduli and signatures */
399 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
400 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
401 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
403 mon_dispatch = mon_dispatch_postauth15;
404 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
407 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
408 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
412 monitor_read(pmonitor, mon_dispatch, NULL);
416 monitor_sync(struct monitor *pmonitor)
418 if (options.compression) {
419 /* The member allocation is not visible, so sync it */
420 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
425 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
426 struct mon_table **pent)
434 mm_request_receive(pmonitor->m_sendfd, &m);
435 type = buffer_get_char(&m);
437 debug3("%s: checking request %d", __func__, type);
439 while (ent->f != NULL) {
440 if (ent->type == type)
445 if (ent->f != NULL) {
446 if (!(ent->flags & MON_PERMIT))
447 fatal("%s: unpermitted request %d", __func__,
449 ret = (*ent->f)(pmonitor->m_sendfd, &m);
452 /* The child may use this request only once, disable it */
453 if (ent->flags & MON_ONCE) {
454 debug2("%s: %d used once, disabling now", __func__,
456 ent->flags &= ~MON_PERMIT;
465 fatal("%s: unsupported request: %d", __func__, type);
471 /* allowed key state */
473 monitor_allowed_key(u_char *blob, u_int bloblen)
475 /* make sure key is allowed */
476 if (key_blob == NULL || key_bloblen != bloblen ||
477 memcmp(key_blob, blob, key_bloblen))
483 monitor_reset_key_state(void)
486 if (key_blob != NULL)
488 if (hostbased_cuser != NULL)
489 xfree(hostbased_cuser);
490 if (hostbased_chost != NULL)
491 xfree(hostbased_chost);
494 key_blobtype = MM_NOKEY;
495 hostbased_cuser = NULL;
496 hostbased_chost = NULL;
500 mm_answer_moduli(int sock, Buffer *m)
505 min = buffer_get_int(m);
506 want = buffer_get_int(m);
507 max = buffer_get_int(m);
509 debug3("%s: got parameters: %d %d %d",
510 __func__, min, want, max);
511 /* We need to check here, too, in case the child got corrupted */
512 if (max < min || want < min || max < want)
513 fatal("%s: bad parameters: %d %d %d",
514 __func__, min, want, max);
518 dh = choose_dh(min, want, max);
520 buffer_put_char(m, 0);
523 /* Send first bignum */
524 buffer_put_char(m, 1);
525 buffer_put_bignum2(m, dh->p);
526 buffer_put_bignum2(m, dh->g);
530 mm_request_send(sock, MONITOR_ANS_MODULI, m);
535 mm_answer_sign(int sock, Buffer *m)
540 u_int siglen, datlen;
543 debug3("%s", __func__);
545 keyid = buffer_get_int(m);
546 p = buffer_get_string(m, &datlen);
549 * Supported KEX types will only return SHA1 (20 byte) or
550 * SHA256 (32 byte) hashes
552 if (datlen != 20 && datlen != 32)
553 fatal("%s: data length incorrect: %u", __func__, datlen);
555 /* save session id, it will be passed on the first call */
556 if (session_id2_len == 0) {
557 session_id2_len = datlen;
558 session_id2 = xmalloc(session_id2_len);
559 memcpy(session_id2, p, session_id2_len);
562 if ((key = get_hostkey_by_index(keyid)) == NULL)
563 fatal("%s: no hostkey from index %d", __func__, keyid);
564 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
565 fatal("%s: key_sign failed", __func__);
567 debug3("%s: signature %p(%u)", __func__, signature, siglen);
570 buffer_put_string(m, signature, siglen);
575 mm_request_send(sock, MONITOR_ANS_SIGN, m);
577 /* Turn on permissions for getpwnam */
578 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
583 /* Retrieves the password entry and also checks if the user is permitted */
586 mm_answer_pwnamallow(int sock, Buffer *m)
589 struct passwd *pwent;
592 debug3("%s", __func__);
594 if (authctxt->attempt++ != 0)
595 fatal("%s: multiple attempts for getpwnam", __func__);
597 username = buffer_get_string(m, NULL);
599 pwent = getpwnamallow(username);
601 authctxt->user = xstrdup(username);
602 setproctitle("%s [priv]", pwent ? username : "unknown");
608 buffer_put_char(m, 0);
609 authctxt->pw = fakepw();
614 authctxt->pw = pwent;
617 buffer_put_char(m, 1);
618 buffer_put_string(m, pwent, sizeof(struct passwd));
619 buffer_put_cstring(m, pwent->pw_name);
620 buffer_put_cstring(m, "*");
621 buffer_put_cstring(m, pwent->pw_gecos);
622 #ifdef HAVE_PW_CLASS_IN_PASSWD
623 buffer_put_cstring(m, pwent->pw_class);
625 buffer_put_cstring(m, pwent->pw_dir);
626 buffer_put_cstring(m, pwent->pw_shell);
629 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
630 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
632 /* For SSHv1 allow authentication now */
634 monitor_permit_authentications(1);
636 /* Allow service/style information on the auth context */
637 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
638 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
643 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
645 #ifdef SSH_AUDIT_EVENTS
646 monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1);
652 int mm_answer_auth2_read_banner(int sock, Buffer *m)
657 banner = auth2_read_banner();
658 buffer_put_cstring(m, banner != NULL ? banner : "");
659 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
668 mm_answer_authserv(int sock, Buffer *m)
670 monitor_permit_authentications(1);
672 authctxt->service = buffer_get_string(m, NULL);
673 authctxt->style = buffer_get_string(m, NULL);
674 debug3("%s: service=%s, style=%s",
675 __func__, authctxt->service, authctxt->style);
677 if (strlen(authctxt->style) == 0) {
678 xfree(authctxt->style);
679 authctxt->style = NULL;
686 mm_answer_authpassword(int sock, Buffer *m)
688 static int call_count;
693 passwd = buffer_get_string(m, &plen);
694 /* Only authenticate if the context is valid */
695 authenticated = options.password_authentication &&
696 auth_password(authctxt, passwd);
697 memset(passwd, 0, strlen(passwd));
701 buffer_put_int(m, authenticated);
703 debug3("%s: sending result %d", __func__, authenticated);
704 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
707 if (plen == 0 && call_count == 1)
708 auth_method = "none";
710 auth_method = "password";
712 /* Causes monitor loop to terminate if authenticated */
713 return (authenticated);
718 mm_answer_bsdauthquery(int sock, Buffer *m)
720 char *name, *infotxt;
726 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
727 &prompts, &echo_on) < 0 ? 0 : 1;
730 buffer_put_int(m, success);
732 buffer_put_cstring(m, prompts[0]);
734 debug3("%s: sending challenge success: %u", __func__, success);
735 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
748 mm_answer_bsdauthrespond(int sock, Buffer *m)
753 if (authctxt->as == 0)
754 fatal("%s: no bsd auth session", __func__);
756 response = buffer_get_string(m, NULL);
757 authok = options.challenge_response_authentication &&
758 auth_userresponse(authctxt->as, response, 0);
760 debug3("%s: <%s> = <%d>", __func__, response, authok);
764 buffer_put_int(m, authok);
766 debug3("%s: sending authenticated: %d", __func__, authok);
767 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
769 auth_method = "bsdauth";
771 return (authok != 0);
777 mm_answer_skeyquery(int sock, Buffer *m)
780 char challenge[1024];
783 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
784 sizeof(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(sock, MONITOR_ANS_SKEYQUERY, m);
798 mm_answer_skeyrespond(int sock, 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(sock, MONITOR_ANS_SKEYRESPOND, m);
818 auth_method = "skey";
820 return (authok != 0);
826 mm_answer_pam_start(int sock, Buffer *m)
828 if (!options.use_pam)
829 fatal("UsePAM not set, but ended up in %s anyway", __func__);
833 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
839 mm_answer_pam_account(int sock, Buffer *m)
843 if (!options.use_pam)
844 fatal("UsePAM not set, but ended up in %s anyway", __func__);
846 ret = do_pam_account();
848 buffer_put_int(m, ret);
849 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
851 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
856 static void *sshpam_ctxt, *sshpam_authok;
857 extern KbdintDevice sshpam_device;
860 mm_answer_pam_init_ctx(int sock, Buffer *m)
863 debug3("%s", __func__);
864 authctxt->user = buffer_get_string(m, NULL);
865 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
866 sshpam_authok = NULL;
868 if (sshpam_ctxt != NULL) {
869 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
870 buffer_put_int(m, 1);
872 buffer_put_int(m, 0);
874 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
879 mm_answer_pam_query(int sock, Buffer *m)
881 char *name, *info, **prompts;
882 u_int i, num, *echo_on;
885 debug3("%s", __func__);
886 sshpam_authok = NULL;
887 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
888 if (ret == 0 && num == 0)
889 sshpam_authok = sshpam_ctxt;
890 if (num > 1 || name == NULL || info == NULL)
893 buffer_put_int(m, ret);
894 buffer_put_cstring(m, name);
896 buffer_put_cstring(m, info);
898 buffer_put_int(m, num);
899 for (i = 0; i < num; ++i) {
900 buffer_put_cstring(m, prompts[i]);
902 buffer_put_int(m, echo_on[i]);
908 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
913 mm_answer_pam_respond(int sock, Buffer *m)
919 debug3("%s", __func__);
920 sshpam_authok = NULL;
921 num = buffer_get_int(m);
923 resp = xmalloc(num * sizeof(char *));
924 for (i = 0; i < num; ++i)
925 resp[i] = buffer_get_string(m, NULL);
926 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
927 for (i = 0; i < num; ++i)
931 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
934 buffer_put_int(m, ret);
935 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
936 auth_method = "keyboard-interactive/pam";
938 sshpam_authok = sshpam_ctxt;
943 mm_answer_pam_free_ctx(int sock, Buffer *m)
946 debug3("%s", __func__);
947 (sshpam_device.free_ctx)(sshpam_ctxt);
949 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
950 return (sshpam_authok == sshpam_ctxt);
955 mm_append_debug(Buffer *m)
957 if (auth_debug_init && buffer_len(&auth_debug)) {
958 debug3("%s: Appending debug messages for child", __func__);
959 buffer_append(m, buffer_ptr(&auth_debug),
960 buffer_len(&auth_debug));
961 buffer_clear(&auth_debug);
966 mm_answer_keyallowed(int sock, Buffer *m)
972 enum mm_keytype type = 0;
975 debug3("%s entering", __func__);
977 type = buffer_get_int(m);
978 cuser = buffer_get_string(m, NULL);
979 chost = buffer_get_string(m, NULL);
980 blob = buffer_get_string(m, &bloblen);
982 key = key_from_blob(blob, bloblen);
984 if ((compat20 && type == MM_RSAHOSTKEY) ||
985 (!compat20 && type != MM_RSAHOSTKEY))
986 fatal("%s: key type and protocol mismatch", __func__);
988 debug3("%s: key_from_blob: %p", __func__, key);
990 if (key != NULL && authctxt->valid) {
993 allowed = options.pubkey_authentication &&
994 user_key_allowed(authctxt->pw, key);
997 allowed = options.hostbased_authentication &&
998 hostbased_key_allowed(authctxt->pw,
1002 key->type = KEY_RSA1; /* XXX */
1003 allowed = options.rhosts_rsa_authentication &&
1004 auth_rhosts_rsa_key_allowed(authctxt->pw,
1008 fatal("%s: unknown key type %d", __func__, type);
1015 /* clear temporarily storage (used by verify) */
1016 monitor_reset_key_state();
1019 /* Save temporarily for comparison in verify */
1021 key_bloblen = bloblen;
1022 key_blobtype = type;
1023 hostbased_cuser = cuser;
1024 hostbased_chost = chost;
1031 debug3("%s: key %p is %s",
1032 __func__, key, allowed ? "allowed" : "disallowed");
1035 buffer_put_int(m, allowed);
1036 buffer_put_int(m, forced_command != NULL);
1040 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1042 if (type == MM_RSAHOSTKEY)
1043 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1049 monitor_valid_userblob(u_char *data, u_int datalen)
1057 buffer_append(&b, data, datalen);
1059 if (datafellows & SSH_OLD_SESSIONID) {
1061 len = buffer_len(&b);
1062 if ((session_id2 == NULL) ||
1063 (len < session_id2_len) ||
1064 (memcmp(p, session_id2, session_id2_len) != 0))
1066 buffer_consume(&b, session_id2_len);
1068 p = buffer_get_string(&b, &len);
1069 if ((session_id2 == NULL) ||
1070 (len != session_id2_len) ||
1071 (memcmp(p, session_id2, session_id2_len) != 0))
1075 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1077 p = buffer_get_string(&b, NULL);
1078 if (strcmp(authctxt->user, p) != 0) {
1079 logit("wrong user name passed to monitor: expected %s != %.100s",
1084 buffer_skip_string(&b);
1085 if (datafellows & SSH_BUG_PKAUTH) {
1086 if (!buffer_get_char(&b))
1089 p = buffer_get_string(&b, NULL);
1090 if (strcmp("publickey", p) != 0)
1093 if (!buffer_get_char(&b))
1095 buffer_skip_string(&b);
1097 buffer_skip_string(&b);
1098 if (buffer_len(&b) != 0)
1105 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1114 buffer_append(&b, data, datalen);
1116 p = buffer_get_string(&b, &len);
1117 if ((session_id2 == NULL) ||
1118 (len != session_id2_len) ||
1119 (memcmp(p, session_id2, session_id2_len) != 0))
1123 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1125 p = buffer_get_string(&b, NULL);
1126 if (strcmp(authctxt->user, p) != 0) {
1127 logit("wrong user name passed to monitor: expected %s != %.100s",
1132 buffer_skip_string(&b); /* service */
1133 p = buffer_get_string(&b, NULL);
1134 if (strcmp(p, "hostbased") != 0)
1137 buffer_skip_string(&b); /* pkalg */
1138 buffer_skip_string(&b); /* pkblob */
1140 /* verify client host, strip trailing dot if necessary */
1141 p = buffer_get_string(&b, NULL);
1142 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1144 if (strcmp(p, chost) != 0)
1148 /* verify client user */
1149 p = buffer_get_string(&b, NULL);
1150 if (strcmp(p, cuser) != 0)
1154 if (buffer_len(&b) != 0)
1161 mm_answer_keyverify(int sock, Buffer *m)
1164 u_char *signature, *data, *blob;
1165 u_int signaturelen, datalen, bloblen;
1169 blob = buffer_get_string(m, &bloblen);
1170 signature = buffer_get_string(m, &signaturelen);
1171 data = buffer_get_string(m, &datalen);
1173 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1174 !monitor_allowed_key(blob, bloblen))
1175 fatal("%s: bad key, not previously allowed", __func__);
1177 key = key_from_blob(blob, bloblen);
1179 fatal("%s: bad public key blob", __func__);
1181 switch (key_blobtype) {
1183 valid_data = monitor_valid_userblob(data, datalen);
1186 valid_data = monitor_valid_hostbasedblob(data, datalen,
1187 hostbased_cuser, hostbased_chost);
1194 fatal("%s: bad signature data blob", __func__);
1196 verified = key_verify(key, signature, signaturelen, data, datalen);
1197 debug3("%s: key %p signature %s",
1198 __func__, key, verified ? "verified" : "unverified");
1205 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1207 monitor_reset_key_state();
1210 buffer_put_int(m, verified);
1211 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1217 mm_record_login(Session *s, struct passwd *pw)
1220 struct sockaddr_storage from;
1223 * Get IP address of client. If the connection is not a socket, let
1224 * the address be 0.0.0.0.
1226 memset(&from, 0, sizeof(from));
1227 fromlen = sizeof(from);
1228 if (packet_connection_is_on_socket()) {
1229 if (getpeername(packet_get_connection_in(),
1230 (struct sockaddr *)&from, &fromlen) < 0) {
1231 debug("getpeername: %.100s", strerror(errno));
1235 /* Record that there was a login on that tty from the remote host. */
1236 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1237 get_remote_name_or_ip(utmp_len, options.use_dns),
1238 (struct sockaddr *)&from, fromlen);
1242 mm_session_close(Session *s)
1244 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1245 if (s->ttyfd != -1) {
1246 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1247 session_pty_cleanup2(s);
1253 mm_answer_pty(int sock, Buffer *m)
1255 extern struct monitor *pmonitor;
1259 debug3("%s entering", __func__);
1265 s->authctxt = authctxt;
1266 s->pw = authctxt->pw;
1267 s->pid = pmonitor->m_pid;
1268 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1271 pty_setowner(authctxt->pw, s->tty);
1273 buffer_put_int(m, 1);
1274 buffer_put_cstring(m, s->tty);
1276 /* We need to trick ttyslot */
1277 if (dup2(s->ttyfd, 0) == -1)
1278 fatal("%s: dup2", __func__);
1280 mm_record_login(s, authctxt->pw);
1282 /* Now we can close the file descriptor again */
1285 /* send messages generated by record_login */
1286 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1287 buffer_clear(&loginmsg);
1289 mm_request_send(sock, MONITOR_ANS_PTY, m);
1291 mm_send_fd(sock, s->ptyfd);
1292 mm_send_fd(sock, s->ttyfd);
1294 /* make sure nothing uses fd 0 */
1295 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1296 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1298 error("%s: fd0 %d != 0", __func__, fd0);
1300 /* slave is not needed */
1302 s->ttyfd = s->ptyfd;
1303 /* no need to dup() because nobody closes ptyfd */
1304 s->ptymaster = s->ptyfd;
1306 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1312 mm_session_close(s);
1313 buffer_put_int(m, 0);
1314 mm_request_send(sock, MONITOR_ANS_PTY, m);
1319 mm_answer_pty_cleanup(int sock, Buffer *m)
1324 debug3("%s entering", __func__);
1326 tty = buffer_get_string(m, NULL);
1327 if ((s = session_by_tty(tty)) != NULL)
1328 mm_session_close(s);
1335 mm_answer_sesskey(int sock, Buffer *m)
1340 /* Turn off permissions */
1341 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1343 if ((p = BN_new()) == NULL)
1344 fatal("%s: BN_new", __func__);
1346 buffer_get_bignum2(m, p);
1348 rsafail = ssh1_session_key(p);
1351 buffer_put_int(m, rsafail);
1352 buffer_put_bignum2(m, p);
1356 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1358 /* Turn on permissions for sessid passing */
1359 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1365 mm_answer_sessid(int sock, Buffer *m)
1369 debug3("%s entering", __func__);
1371 if (buffer_len(m) != 16)
1372 fatal("%s: bad ssh1 session id", __func__);
1373 for (i = 0; i < 16; i++)
1374 session_id[i] = buffer_get_char(m);
1376 /* Turn on permissions for getpwnam */
1377 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1383 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1387 u_char *blob = NULL;
1391 debug3("%s entering", __func__);
1393 if (options.rsa_authentication && authctxt->valid) {
1394 if ((client_n = BN_new()) == NULL)
1395 fatal("%s: BN_new", __func__);
1396 buffer_get_bignum2(m, client_n);
1397 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1398 BN_clear_free(client_n);
1401 buffer_put_int(m, allowed);
1402 buffer_put_int(m, forced_command != NULL);
1404 /* clear temporarily storage (used by generate challenge) */
1405 monitor_reset_key_state();
1407 if (allowed && key != NULL) {
1408 key->type = KEY_RSA; /* cheat for key_to_blob */
1409 if (key_to_blob(key, &blob, &blen) == 0)
1410 fatal("%s: key_to_blob failed", __func__);
1411 buffer_put_string(m, blob, blen);
1413 /* Save temporarily for comparison in verify */
1416 key_blobtype = MM_RSAUSERKEY;
1423 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1425 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1426 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1431 mm_answer_rsa_challenge(int sock, Buffer *m)
1437 debug3("%s entering", __func__);
1439 if (!authctxt->valid)
1440 fatal("%s: authctxt not valid", __func__);
1441 blob = buffer_get_string(m, &blen);
1442 if (!monitor_allowed_key(blob, blen))
1443 fatal("%s: bad key, not previously allowed", __func__);
1444 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1445 fatal("%s: key type mismatch", __func__);
1446 if ((key = key_from_blob(blob, blen)) == NULL)
1447 fatal("%s: received bad key", __func__);
1450 BN_clear_free(ssh1_challenge);
1451 ssh1_challenge = auth_rsa_generate_challenge(key);
1454 buffer_put_bignum2(m, ssh1_challenge);
1456 debug3("%s sending reply", __func__);
1457 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1459 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1467 mm_answer_rsa_response(int sock, Buffer *m)
1470 u_char *blob, *response;
1474 debug3("%s entering", __func__);
1476 if (!authctxt->valid)
1477 fatal("%s: authctxt not valid", __func__);
1478 if (ssh1_challenge == NULL)
1479 fatal("%s: no ssh1_challenge", __func__);
1481 blob = buffer_get_string(m, &blen);
1482 if (!monitor_allowed_key(blob, blen))
1483 fatal("%s: bad key, not previously allowed", __func__);
1484 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1485 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1486 if ((key = key_from_blob(blob, blen)) == NULL)
1487 fatal("%s: received bad key", __func__);
1488 response = buffer_get_string(m, &len);
1490 fatal("%s: received bad response to challenge", __func__);
1491 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1497 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1500 BN_clear_free(ssh1_challenge);
1501 ssh1_challenge = NULL;
1502 monitor_reset_key_state();
1505 buffer_put_int(m, success);
1506 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1512 mm_answer_term(int sock, Buffer *req)
1514 extern struct monitor *pmonitor;
1517 debug3("%s: tearing down sessions", __func__);
1519 /* The child is terminating */
1520 session_destroy_all(&mm_session_close);
1522 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1526 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1528 /* Terminate process */
1532 #ifdef SSH_AUDIT_EVENTS
1533 /* Report that an audit event occurred */
1535 mm_answer_audit_event(int socket, Buffer *m)
1537 ssh_audit_event_t event;
1539 debug3("%s entering", __func__);
1541 event = buffer_get_int(m);
1543 case SSH_AUTH_FAIL_PUBKEY:
1544 case SSH_AUTH_FAIL_HOSTBASED:
1545 case SSH_AUTH_FAIL_GSSAPI:
1546 case SSH_LOGIN_EXCEED_MAXTRIES:
1547 case SSH_LOGIN_ROOT_DENIED:
1548 case SSH_CONNECTION_CLOSE:
1549 case SSH_INVALID_USER:
1553 fatal("Audit event type %d not permitted", event);
1560 mm_answer_audit_command(int socket, Buffer *m)
1565 debug3("%s entering", __func__);
1566 cmd = buffer_get_string(m, &len);
1567 /* sanity check command, if so how? */
1568 audit_run_command(cmd);
1572 #endif /* SSH_AUDIT_EVENTS */
1575 monitor_apply_keystate(struct monitor *pmonitor)
1578 set_newkeys(MODE_IN);
1579 set_newkeys(MODE_OUT);
1581 packet_set_protocol_flags(child_state.ssh1protoflags);
1582 packet_set_encryption_key(child_state.ssh1key,
1583 child_state.ssh1keylen, child_state.ssh1cipher);
1584 xfree(child_state.ssh1key);
1587 /* for rc4 and other stateful ciphers */
1588 packet_set_keycontext(MODE_OUT, child_state.keyout);
1589 xfree(child_state.keyout);
1590 packet_set_keycontext(MODE_IN, child_state.keyin);
1591 xfree(child_state.keyin);
1594 packet_set_iv(MODE_OUT, child_state.ivout);
1595 xfree(child_state.ivout);
1596 packet_set_iv(MODE_IN, child_state.ivin);
1597 xfree(child_state.ivin);
1600 memcpy(&incoming_stream, &child_state.incoming,
1601 sizeof(incoming_stream));
1602 memcpy(&outgoing_stream, &child_state.outgoing,
1603 sizeof(outgoing_stream));
1605 /* Update with new address */
1606 if (options.compression)
1607 mm_init_compression(pmonitor->m_zlib);
1609 /* Network I/O buffers */
1610 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1611 buffer_clear(&input);
1612 buffer_append(&input, child_state.input, child_state.ilen);
1613 memset(child_state.input, 0, child_state.ilen);
1614 xfree(child_state.input);
1616 buffer_clear(&output);
1617 buffer_append(&output, child_state.output, child_state.olen);
1618 memset(child_state.output, 0, child_state.olen);
1619 xfree(child_state.output);
1623 mm_get_kex(Buffer *m)
1629 kex = xcalloc(1, sizeof(*kex));
1630 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1631 if ((session_id2 == NULL) ||
1632 (kex->session_id_len != session_id2_len) ||
1633 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1634 fatal("mm_get_get: internal error: bad session id");
1635 kex->we_need = buffer_get_int(m);
1636 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1637 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1638 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1639 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1641 kex->hostkey_type = buffer_get_int(m);
1642 kex->kex_type = buffer_get_int(m);
1643 blob = buffer_get_string(m, &bloblen);
1644 buffer_init(&kex->my);
1645 buffer_append(&kex->my, blob, bloblen);
1647 blob = buffer_get_string(m, &bloblen);
1648 buffer_init(&kex->peer);
1649 buffer_append(&kex->peer, blob, bloblen);
1652 kex->flags = buffer_get_int(m);
1653 kex->client_version_string = buffer_get_string(m, NULL);
1654 kex->server_version_string = buffer_get_string(m, NULL);
1655 kex->load_host_key=&get_hostkey_by_type;
1656 kex->host_key_index=&get_hostkey_index;
1661 /* This function requries careful sanity checking */
1664 mm_get_keystate(struct monitor *pmonitor)
1668 u_int bloblen, plen;
1669 u_int32_t seqnr, packets;
1672 debug3("%s: Waiting for new keys", __func__);
1675 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1677 child_state.ssh1protoflags = buffer_get_int(&m);
1678 child_state.ssh1cipher = buffer_get_int(&m);
1679 child_state.ssh1key = buffer_get_string(&m,
1680 &child_state.ssh1keylen);
1681 child_state.ivout = buffer_get_string(&m,
1682 &child_state.ivoutlen);
1683 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1686 /* Get the Kex for rekeying */
1687 *pmonitor->m_pkex = mm_get_kex(&m);
1690 blob = buffer_get_string(&m, &bloblen);
1691 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1694 debug3("%s: Waiting for second key", __func__);
1695 blob = buffer_get_string(&m, &bloblen);
1696 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1699 /* Now get sequence numbers for the packets */
1700 seqnr = buffer_get_int(&m);
1701 blocks = buffer_get_int64(&m);
1702 packets = buffer_get_int(&m);
1703 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1704 seqnr = buffer_get_int(&m);
1705 blocks = buffer_get_int64(&m);
1706 packets = buffer_get_int(&m);
1707 packet_set_state(MODE_IN, seqnr, blocks, packets);
1710 /* Get the key context */
1711 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1712 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1714 debug3("%s: Getting compression state", __func__);
1715 /* Get compression state */
1716 p = buffer_get_string(&m, &plen);
1717 if (plen != sizeof(child_state.outgoing))
1718 fatal("%s: bad request size", __func__);
1719 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1722 p = buffer_get_string(&m, &plen);
1723 if (plen != sizeof(child_state.incoming))
1724 fatal("%s: bad request size", __func__);
1725 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1728 /* Network I/O buffers */
1729 debug3("%s: Getting Network I/O buffers", __func__);
1730 child_state.input = buffer_get_string(&m, &child_state.ilen);
1731 child_state.output = buffer_get_string(&m, &child_state.olen);
1737 /* Allocation functions for zlib */
1739 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1741 size_t len = (size_t) size * ncount;
1744 if (len == 0 || ncount > SIZE_T_MAX / size)
1745 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1747 address = mm_malloc(mm, len);
1753 mm_zfree(struct mm_master *mm, void *address)
1755 mm_free(mm, address);
1759 mm_init_compression(struct mm_master *mm)
1761 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1762 outgoing_stream.zfree = (free_func)mm_zfree;
1763 outgoing_stream.opaque = mm;
1765 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1766 incoming_stream.zfree = (free_func)mm_zfree;
1767 incoming_stream.opaque = mm;
1772 #define FD_CLOSEONEXEC(x) do { \
1773 if (fcntl(x, F_SETFD, 1) == -1) \
1774 fatal("fcntl(%d, F_SETFD)", x); \
1778 monitor_socketpair(int *pair)
1780 #ifdef HAVE_SOCKETPAIR
1781 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1782 fatal("%s: socketpair", __func__);
1784 fatal("%s: UsePrivilegeSeparation=yes not supported",
1787 FD_CLOSEONEXEC(pair[0]);
1788 FD_CLOSEONEXEC(pair[1]);
1791 #define MM_MEMSIZE 65536
1796 struct monitor *mon;
1799 mon = xcalloc(1, sizeof(*mon));
1801 monitor_socketpair(pair);
1803 mon->m_recvfd = pair[0];
1804 mon->m_sendfd = pair[1];
1806 /* Used to share zlib space across processes */
1807 if (options.compression) {
1808 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1809 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1811 /* Compression needs to share state across borders */
1812 mm_init_compression(mon->m_zlib);
1819 monitor_reinit(struct monitor *mon)
1823 monitor_socketpair(pair);
1825 mon->m_recvfd = pair[0];
1826 mon->m_sendfd = pair[1];
1831 mm_answer_gss_setup_ctx(int sock, Buffer *m)
1837 goid.elements = buffer_get_string(m, &len);
1840 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1842 xfree(goid.elements);
1845 buffer_put_int(m, major);
1847 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1849 /* Now we have a context, enable the step */
1850 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1856 mm_answer_gss_accept_ctx(int sock, Buffer *m)
1859 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1860 OM_uint32 major, minor;
1861 OM_uint32 flags = 0; /* GSI needs this */
1864 in.value = buffer_get_string(m, &len);
1866 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1870 buffer_put_int(m, major);
1871 buffer_put_string(m, out.value, out.length);
1872 buffer_put_int(m, flags);
1873 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1875 gss_release_buffer(&minor, &out);
1877 if (major == GSS_S_COMPLETE) {
1878 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1879 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1880 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1886 mm_answer_gss_checkmic(int sock, Buffer *m)
1888 gss_buffer_desc gssbuf, mic;
1892 gssbuf.value = buffer_get_string(m, &len);
1893 gssbuf.length = len;
1894 mic.value = buffer_get_string(m, &len);
1897 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1899 xfree(gssbuf.value);
1903 buffer_put_int(m, ret);
1905 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1907 if (!GSS_ERROR(ret))
1908 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1914 mm_answer_gss_userok(int sock, Buffer *m)
1918 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1921 buffer_put_int(m, authenticated);
1923 debug3("%s: sending result %d", __func__, authenticated);
1924 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1926 auth_method = "gssapi-with-mic";
1928 /* Monitor loop will terminate if authenticated */
1929 return (authenticated);