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 1.49 2003/08/28 12:54:34 markus 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 *);
140 int mm_answer_gss_setup_ctx(int, Buffer *);
141 int mm_answer_gss_accept_ctx(int, Buffer *);
142 int mm_answer_gss_userok(int, Buffer *);
143 int mm_answer_gss_sign(int, Buffer *);
144 int mm_answer_gss_error(int, Buffer *);
145 int mm_answer_gss_indicate_mechs(int, Buffer *);
146 int mm_answer_gss_localname(int, Buffer *);
149 static Authctxt *authctxt;
150 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
152 /* local state for key verify */
153 static u_char *key_blob = NULL;
154 static u_int key_bloblen = 0;
155 static int key_blobtype = MM_NOKEY;
156 static char *hostbased_cuser = NULL;
157 static char *hostbased_chost = NULL;
158 static char *auth_method = "unknown";
159 static u_int session_id2_len = 0;
160 static u_char *session_id2 = NULL;
161 static pid_t monitor_child_pid;
164 enum monitor_reqtype type;
166 int (*f)(int, Buffer *);
169 #define MON_ISAUTH 0x0004 /* Required for Authentication */
170 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
171 #define MON_ONCE 0x0010 /* Disable after calling */
173 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
175 #define MON_PERMIT 0x1000 /* Request is permitted */
177 struct mon_table mon_dispatch_proto20[] = {
178 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
179 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
180 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
181 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
182 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
183 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
185 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
186 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
187 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
188 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
189 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
190 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
193 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
194 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
197 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
198 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
200 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
201 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
203 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
204 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
205 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
206 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
207 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
208 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
209 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
214 struct mon_table mon_dispatch_postauth20[] = {
216 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
217 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
218 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
219 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
220 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
222 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
223 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
224 {MONITOR_REQ_PTY, 0, mm_answer_pty},
225 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
226 {MONITOR_REQ_TERM, 0, mm_answer_term},
230 struct mon_table mon_dispatch_proto15[] = {
231 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
232 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
233 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
234 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
235 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
236 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
237 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
238 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
240 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
241 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
244 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
245 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
248 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
249 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
250 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
251 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
252 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
255 {MONITOR_REQ_PAM_START, MON_ISAUTH, 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},
265 struct mon_table mon_dispatch_postauth15[] = {
266 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
267 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
268 {MONITOR_REQ_TERM, 0, mm_answer_term},
272 struct mon_table *mon_dispatch;
274 /* Specifies if a certain message is allowed at the moment */
277 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
279 while (ent->f != NULL) {
280 if (ent->type == type) {
281 ent->flags &= ~MON_PERMIT;
282 ent->flags |= permit ? MON_PERMIT : 0;
290 monitor_permit_authentications(int permit)
292 struct mon_table *ent = mon_dispatch;
294 while (ent->f != NULL) {
295 if (ent->flags & MON_AUTH) {
296 ent->flags &= ~MON_PERMIT;
297 ent->flags |= permit ? MON_PERMIT : 0;
304 monitor_child_preauth(struct monitor *pmonitor)
306 struct mon_table *ent;
307 int authenticated = 0;
309 debug3("preauth child monitor started");
312 mon_dispatch = mon_dispatch_proto20;
314 /* Permit requests for moduli and signatures */
315 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
316 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
318 /* and for the GSSAPI key exchange */
319 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
320 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
321 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
324 mon_dispatch = mon_dispatch_proto15;
326 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
329 authctxt = authctxt_new();
331 /* The first few requests do not require asynchronous access */
332 while (!authenticated) {
333 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
335 if (!(ent->flags & MON_AUTHDECIDE))
336 fatal("%s: unexpected authentication from %d",
337 __func__, ent->type);
338 if (authctxt->pw->pw_uid == 0 &&
339 !auth_root_allowed(auth_method))
342 /* PAM needs to perform account checks after auth */
343 if (options.use_pam) {
347 mm_request_receive_expect(pmonitor->m_sendfd,
348 MONITOR_REQ_PAM_ACCOUNT, &m);
349 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
355 if (ent->flags & MON_AUTHDECIDE) {
356 auth_log(authctxt, authenticated, auth_method,
357 compat20 ? " ssh2" : "");
359 authctxt->failures++;
363 if (!authctxt->valid)
364 fatal("%s: authenticated invalid user", __func__);
366 debug("%s: %s has been authenticated by privileged process",
367 __func__, authctxt->user);
369 mm_get_keystate(pmonitor);
375 monitor_set_child_handler(pid_t pid)
377 monitor_child_pid = pid;
381 monitor_child_handler(int signal)
383 kill(monitor_child_pid, signal);
387 monitor_child_postauth(struct monitor *pmonitor)
389 monitor_set_child_handler(pmonitor->m_pid);
390 signal(SIGHUP, &monitor_child_handler);
391 signal(SIGTERM, &monitor_child_handler);
394 mon_dispatch = mon_dispatch_postauth20;
396 /* Permit requests for moduli and signatures */
397 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
398 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
399 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
402 /* and for the GSSAPI key exchange */
403 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
404 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
405 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
409 mon_dispatch = mon_dispatch_postauth15;
410 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
413 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
416 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
417 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
421 monitor_read(pmonitor, mon_dispatch, NULL);
425 monitor_sync(struct monitor *pmonitor)
427 if (options.compression) {
428 /* The member allocation is not visible, so sync it */
429 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
434 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
435 struct mon_table **pent)
443 mm_request_receive(pmonitor->m_sendfd, &m);
444 type = buffer_get_char(&m);
446 debug3("%s: checking request %d", __func__, type);
448 while (ent->f != NULL) {
449 if (ent->type == type)
454 if (ent->f != NULL) {
455 if (!(ent->flags & MON_PERMIT))
456 fatal("%s: unpermitted request %d", __func__,
458 ret = (*ent->f)(pmonitor->m_sendfd, &m);
461 /* The child may use this request only once, disable it */
462 if (ent->flags & MON_ONCE) {
463 debug2("%s: %d used once, disabling now", __func__,
465 ent->flags &= ~MON_PERMIT;
474 fatal("%s: unsupported request: %d", __func__, type);
480 /* allowed key state */
482 monitor_allowed_key(u_char *blob, u_int bloblen)
484 /* make sure key is allowed */
485 if (key_blob == NULL || key_bloblen != bloblen ||
486 memcmp(key_blob, blob, key_bloblen))
492 monitor_reset_key_state(void)
495 if (key_blob != NULL)
497 if (hostbased_cuser != NULL)
498 xfree(hostbased_cuser);
499 if (hostbased_chost != NULL)
500 xfree(hostbased_chost);
503 key_blobtype = MM_NOKEY;
504 hostbased_cuser = NULL;
505 hostbased_chost = NULL;
509 mm_answer_moduli(int socket, Buffer *m)
514 min = buffer_get_int(m);
515 want = buffer_get_int(m);
516 max = buffer_get_int(m);
518 debug3("%s: got parameters: %d %d %d",
519 __func__, min, want, max);
520 /* We need to check here, too, in case the child got corrupted */
521 if (max < min || want < min || max < want)
522 fatal("%s: bad parameters: %d %d %d",
523 __func__, min, want, max);
527 dh = choose_dh(min, want, max);
529 buffer_put_char(m, 0);
532 /* Send first bignum */
533 buffer_put_char(m, 1);
534 buffer_put_bignum2(m, dh->p);
535 buffer_put_bignum2(m, dh->g);
539 mm_request_send(socket, MONITOR_ANS_MODULI, m);
544 mm_answer_sign(int socket, Buffer *m)
549 u_int siglen, datlen;
552 debug3("%s", __func__);
554 keyid = buffer_get_int(m);
555 p = buffer_get_string(m, &datlen);
558 fatal("%s: data length incorrect: %u", __func__, datlen);
560 /* save session id, it will be passed on the first call */
561 if (session_id2_len == 0) {
562 session_id2_len = datlen;
563 session_id2 = xmalloc(session_id2_len);
564 memcpy(session_id2, p, session_id2_len);
567 if ((key = get_hostkey_by_index(keyid)) == NULL)
568 fatal("%s: no hostkey from index %d", __func__, keyid);
569 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
570 fatal("%s: key_sign failed", __func__);
572 debug3("%s: signature %p(%u)", __func__, signature, siglen);
575 buffer_put_string(m, signature, siglen);
580 mm_request_send(socket, MONITOR_ANS_SIGN, m);
582 /* Turn on permissions for getpwnam */
583 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
588 /* Retrieves the password entry and also checks if the user is permitted */
591 mm_answer_pwnamallow(int socket, Buffer *m)
594 struct passwd *pwent;
597 debug3("%s", __func__);
599 login = buffer_get_string(m, NULL);
601 pwent = getpwnamallow(login);
603 if (authctxt->user) xfree(authctxt->user);
604 authctxt->user = xstrdup(login);
605 setproctitle("%s [priv]", pwent ? login : "unknown");
611 buffer_put_char(m, 0);
616 authctxt->pw = pwent;
619 buffer_put_char(m, 1);
620 buffer_put_string(m, pwent, sizeof(struct passwd));
621 buffer_put_cstring(m, pwent->pw_name);
622 buffer_put_cstring(m, "*");
623 buffer_put_cstring(m, pwent->pw_gecos);
624 #ifdef HAVE_PW_CLASS_IN_PASSWD
625 buffer_put_cstring(m, pwent->pw_class);
627 buffer_put_cstring(m, pwent->pw_dir);
628 buffer_put_cstring(m, pwent->pw_shell);
631 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
632 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
634 /* For SSHv1 allow authentication now */
636 monitor_permit_authentications(1);
638 /* Allow service/style information on the auth context */
639 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
640 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
645 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
651 int mm_answer_auth2_read_banner(int socket, Buffer *m)
656 banner = auth2_read_banner();
657 buffer_put_cstring(m, banner != NULL ? banner : "");
658 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
667 mm_answer_authserv(int socket, Buffer *m)
669 monitor_permit_authentications(1);
671 authctxt->service = buffer_get_string(m, NULL);
672 authctxt->style = buffer_get_string(m, NULL);
673 debug3("%s: service=%s, style=%s",
674 __func__, authctxt->service, authctxt->style);
676 if (strlen(authctxt->style) == 0) {
677 xfree(authctxt->style);
678 authctxt->style = NULL;
685 mm_answer_authpassword(int socket, Buffer *m)
687 static int call_count;
692 passwd = buffer_get_string(m, &plen);
693 /* Only authenticate if the context is valid */
694 authenticated = options.password_authentication &&
695 auth_password(authctxt, passwd);
696 memset(passwd, 0, strlen(passwd));
700 buffer_put_int(m, authenticated);
702 debug3("%s: sending result %d", __func__, authenticated);
703 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
706 if (plen == 0 && call_count == 1)
707 auth_method = "none";
709 auth_method = "password";
711 /* Causes monitor loop to terminate if authenticated */
712 return (authenticated);
717 mm_answer_bsdauthquery(int socket, Buffer *m)
719 char *name, *infotxt;
725 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
726 &prompts, &echo_on) < 0 ? 0 : 1;
729 buffer_put_int(m, success);
731 buffer_put_cstring(m, prompts[0]);
733 debug3("%s: sending challenge success: %u", __func__, success);
734 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
747 mm_answer_bsdauthrespond(int socket, Buffer *m)
752 if (authctxt->as == 0)
753 fatal("%s: no bsd auth session", __func__);
755 response = buffer_get_string(m, NULL);
756 authok = options.challenge_response_authentication &&
757 auth_userresponse(authctxt->as, response, 0);
759 debug3("%s: <%s> = <%d>", __func__, response, authok);
763 buffer_put_int(m, authok);
765 debug3("%s: sending authenticated: %d", __func__, authok);
766 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
768 auth_method = "bsdauth";
770 return (authok != 0);
776 mm_answer_skeyquery(int socket, Buffer *m)
779 char challenge[1024];
782 success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1;
785 buffer_put_int(m, success);
787 buffer_put_cstring(m, challenge);
789 debug3("%s: sending challenge success: %u", __func__, success);
790 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
796 mm_answer_skeyrespond(int socket, Buffer *m)
801 response = buffer_get_string(m, NULL);
803 authok = (options.challenge_response_authentication &&
805 skey_haskey(authctxt->pw->pw_name) == 0 &&
806 skey_passcheck(authctxt->pw->pw_name, response) != -1);
811 buffer_put_int(m, authok);
813 debug3("%s: sending authenticated: %d", __func__, authok);
814 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
816 auth_method = "skey";
818 return (authok != 0);
824 mm_answer_pam_start(int socket, Buffer *m)
828 if (!options.use_pam)
829 fatal("UsePAM not set, but ended up in %s anyway", __func__);
831 user = buffer_get_string(m, NULL);
837 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
843 mm_answer_pam_account(int socket, Buffer *m)
847 if (!options.use_pam)
848 fatal("UsePAM not set, but ended up in %s anyway", __func__);
850 ret = do_pam_account();
852 buffer_put_int(m, ret);
854 mm_request_send(socket, MONITOR_ANS_PAM_ACCOUNT, m);
859 static void *sshpam_ctxt, *sshpam_authok;
860 extern KbdintDevice sshpam_device;
863 mm_answer_pam_init_ctx(int socket, Buffer *m)
866 debug3("%s", __func__);
867 authctxt->user = buffer_get_string(m, NULL);
868 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
869 sshpam_authok = NULL;
871 if (sshpam_ctxt != NULL) {
872 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
873 buffer_put_int(m, 1);
875 buffer_put_int(m, 0);
877 mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m);
882 mm_answer_pam_query(int socket, Buffer *m)
884 char *name, *info, **prompts;
888 debug3("%s", __func__);
889 sshpam_authok = NULL;
890 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
891 if (ret == 0 && num == 0)
892 sshpam_authok = sshpam_ctxt;
893 if (num > 1 || name == NULL || info == NULL)
896 buffer_put_int(m, ret);
897 buffer_put_cstring(m, name);
899 buffer_put_cstring(m, info);
901 buffer_put_int(m, num);
902 for (i = 0; i < num; ++i) {
903 buffer_put_cstring(m, prompts[i]);
905 buffer_put_int(m, echo_on[i]);
911 mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m);
916 mm_answer_pam_respond(int socket, Buffer *m)
922 debug3("%s", __func__);
923 sshpam_authok = NULL;
924 num = buffer_get_int(m);
926 resp = xmalloc(num * sizeof(char *));
927 for (i = 0; i < num; ++i)
928 resp[i] = buffer_get_string(m, NULL);
929 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
930 for (i = 0; i < num; ++i)
934 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
937 buffer_put_int(m, ret);
938 mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m);
939 auth_method = "keyboard-interactive/pam";
941 sshpam_authok = sshpam_ctxt;
946 mm_answer_pam_free_ctx(int socket, Buffer *m)
949 debug3("%s", __func__);
950 (sshpam_device.free_ctx)(sshpam_ctxt);
952 mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m);
953 return (sshpam_authok == sshpam_ctxt);
958 mm_append_debug(Buffer *m)
960 if (auth_debug_init && buffer_len(&auth_debug)) {
961 debug3("%s: Appending debug messages for child", __func__);
962 buffer_append(m, buffer_ptr(&auth_debug),
963 buffer_len(&auth_debug));
964 buffer_clear(&auth_debug);
969 mm_answer_keyallowed(int socket, Buffer *m)
975 enum mm_keytype type = 0;
978 debug3("%s entering", __func__);
980 type = buffer_get_int(m);
981 cuser = buffer_get_string(m, NULL);
982 chost = buffer_get_string(m, NULL);
983 blob = buffer_get_string(m, &bloblen);
985 key = key_from_blob(blob, bloblen);
987 if ((compat20 && type == MM_RSAHOSTKEY) ||
988 (!compat20 && type != MM_RSAHOSTKEY))
989 fatal("%s: key type and protocol mismatch", __func__);
991 debug3("%s: key_from_blob: %p", __func__, key);
993 if (key != NULL && authctxt->pw != NULL) {
996 allowed = options.pubkey_authentication &&
997 user_key_allowed(authctxt->pw, key);
1000 allowed = options.hostbased_authentication &&
1001 hostbased_key_allowed(authctxt->pw,
1005 key->type = KEY_RSA1; /* XXX */
1006 allowed = options.rhosts_rsa_authentication &&
1007 auth_rhosts_rsa_key_allowed(authctxt->pw,
1011 fatal("%s: unknown key type %d", __func__, type);
1018 /* clear temporarily storage (used by verify) */
1019 monitor_reset_key_state();
1022 /* Save temporarily for comparison in verify */
1024 key_bloblen = bloblen;
1025 key_blobtype = type;
1026 hostbased_cuser = cuser;
1027 hostbased_chost = chost;
1030 debug3("%s: key %p is %s",
1031 __func__, key, allowed ? "allowed" : "disallowed");
1034 buffer_put_int(m, allowed);
1035 buffer_put_int(m, forced_command != NULL);
1039 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
1041 if (type == MM_RSAHOSTKEY)
1042 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1048 monitor_valid_userblob(u_char *data, u_int datalen)
1056 buffer_append(&b, data, datalen);
1058 if (datafellows & SSH_OLD_SESSIONID) {
1060 len = buffer_len(&b);
1061 if ((session_id2 == NULL) ||
1062 (len < session_id2_len) ||
1063 (memcmp(p, session_id2, session_id2_len) != 0))
1065 buffer_consume(&b, session_id2_len);
1067 p = buffer_get_string(&b, &len);
1068 if ((session_id2 == NULL) ||
1069 (len != session_id2_len) ||
1070 (memcmp(p, session_id2, session_id2_len) != 0))
1074 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1076 p = buffer_get_string(&b, NULL);
1077 if (strcmp(authctxt->user, p) != 0) {
1078 logit("wrong user name passed to monitor: expected %s != %.100s",
1083 buffer_skip_string(&b);
1084 if (datafellows & SSH_BUG_PKAUTH) {
1085 if (!buffer_get_char(&b))
1088 p = buffer_get_string(&b, NULL);
1089 if (strcmp("publickey", p) != 0)
1092 if (!buffer_get_char(&b))
1094 buffer_skip_string(&b);
1096 buffer_skip_string(&b);
1097 if (buffer_len(&b) != 0)
1104 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1113 buffer_append(&b, data, datalen);
1115 p = buffer_get_string(&b, &len);
1116 if ((session_id2 == NULL) ||
1117 (len != session_id2_len) ||
1118 (memcmp(p, session_id2, session_id2_len) != 0))
1122 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1124 p = buffer_get_string(&b, NULL);
1125 if (strcmp(authctxt->user, p) != 0) {
1126 logit("wrong user name passed to monitor: expected %s != %.100s",
1131 buffer_skip_string(&b); /* service */
1132 p = buffer_get_string(&b, NULL);
1133 if (strcmp(p, "hostbased") != 0)
1136 buffer_skip_string(&b); /* pkalg */
1137 buffer_skip_string(&b); /* pkblob */
1139 /* verify client host, strip trailing dot if necessary */
1140 p = buffer_get_string(&b, NULL);
1141 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1143 if (strcmp(p, chost) != 0)
1147 /* verify client user */
1148 p = buffer_get_string(&b, NULL);
1149 if (strcmp(p, cuser) != 0)
1153 if (buffer_len(&b) != 0)
1160 mm_answer_keyverify(int socket, Buffer *m)
1163 u_char *signature, *data, *blob;
1164 u_int signaturelen, datalen, bloblen;
1168 blob = buffer_get_string(m, &bloblen);
1169 signature = buffer_get_string(m, &signaturelen);
1170 data = buffer_get_string(m, &datalen);
1172 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1173 !monitor_allowed_key(blob, bloblen))
1174 fatal("%s: bad key, not previously allowed", __func__);
1176 key = key_from_blob(blob, bloblen);
1178 fatal("%s: bad public key blob", __func__);
1180 switch (key_blobtype) {
1182 valid_data = monitor_valid_userblob(data, datalen);
1185 valid_data = monitor_valid_hostbasedblob(data, datalen,
1186 hostbased_cuser, hostbased_chost);
1193 fatal("%s: bad signature data blob", __func__);
1195 verified = key_verify(key, signature, signaturelen, data, datalen);
1196 debug3("%s: key %p signature %s",
1197 __func__, key, verified ? "verified" : "unverified");
1204 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1206 monitor_reset_key_state();
1209 buffer_put_int(m, verified);
1210 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1216 mm_record_login(Session *s, struct passwd *pw)
1219 struct sockaddr_storage from;
1222 * Get IP address of client. If the connection is not a socket, let
1223 * the address be 0.0.0.0.
1225 memset(&from, 0, sizeof(from));
1226 fromlen = sizeof(from);
1227 if (packet_connection_is_on_socket()) {
1228 if (getpeername(packet_get_connection_in(),
1229 (struct sockaddr *) & from, &fromlen) < 0) {
1230 debug("getpeername: %.100s", strerror(errno));
1234 /* Record that there was a login on that tty from the remote host. */
1235 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1236 get_remote_name_or_ip(utmp_len, options.use_dns),
1237 (struct sockaddr *)&from, fromlen);
1241 mm_session_close(Session *s)
1243 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1244 if (s->ttyfd != -1) {
1245 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1246 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
1247 session_pty_cleanup2(s);
1253 mm_answer_pty(int socket, 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 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
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));
1757 monitor_socketpair(pair);
1759 mon->m_recvfd = pair[0];
1760 mon->m_sendfd = pair[1];
1762 /* Used to share zlib space across processes */
1763 if (options.compression) {
1764 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1765 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1767 /* Compression needs to share state across borders */
1768 mm_init_compression(mon->m_zlib);
1775 monitor_reinit(struct monitor *mon)
1779 monitor_socketpair(pair);
1781 mon->m_recvfd = pair[0];
1782 mon->m_sendfd = pair[1];
1787 mm_answer_gss_setup_ctx(int socket, Buffer *m)
1793 oid.elements = buffer_get_string(m, &len);
1796 major = ssh_gssapi_server_ctx(&gsscontext, &oid);
1798 xfree(oid.elements);
1801 buffer_put_int(m, major);
1803 mm_request_send(socket,MONITOR_ANS_GSSSETUP, m);
1805 /* Now we have a context, enable the step */
1806 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1812 mm_answer_gss_accept_ctx(int socket, Buffer *m)
1815 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1816 OM_uint32 major,minor;
1817 OM_uint32 flags = 0; /* GSI needs this */
1820 in.value = buffer_get_string(m, &len);
1822 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1826 buffer_put_int(m, major);
1827 buffer_put_string(m, out.value, out.length);
1828 buffer_put_int(m, flags);
1829 mm_request_send(socket, MONITOR_ANS_GSSSTEP, m);
1831 gss_release_buffer(&minor, &out);
1833 /* Complete - now we can do signing */
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);
1843 mm_answer_gss_userok(int socket, Buffer *m)
1847 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1850 buffer_put_int(m, authenticated);
1852 debug3("%s: sending result %d", __func__, authenticated);
1853 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
1855 auth_method="gssapi";
1857 /* Monitor loop will terminate if authenticated */
1858 return (authenticated);
1862 mm_answer_gss_sign(int socket, Buffer *m) {
1863 gss_buffer_desc data,hash;
1864 OM_uint32 major,minor;
1866 data.value = buffer_get_string(m,&data.length);
1867 if (data.length != 16) { /* HACK - i.e. we are using SSHv1 */
1868 if (data.length != 20)
1869 fatal("%s: data length incorrect: %d", __func__, data.length);
1871 /* Save the session ID - only first time round */
1872 if (session_id2_len == 0) {
1873 session_id2_len=data.length;
1874 session_id2 = xmalloc(session_id2_len);
1875 memcpy(session_id2, data.value, session_id2_len);
1878 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1883 buffer_put_int(m, major);
1884 buffer_put_string(m, hash.value, hash.length);
1886 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1888 gss_release_buffer(&minor,&hash);
1890 /* Turn on permissions for getpwnam */
1891 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1897 mm_answer_gss_error(int socket, Buffer *m) {
1898 OM_uint32 major,minor;
1901 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
1903 buffer_put_int(m,major);
1904 buffer_put_int(m,minor);
1905 buffer_put_cstring(m,msg);
1907 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
1915 mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
1916 OM_uint32 major,minor;
1917 gss_OID_set mech_set;
1920 major=gss_indicate_mechs(&minor, &mech_set);
1923 buffer_put_int(m, major);
1924 buffer_put_int(m, mech_set->count);
1925 for (i=0; i < mech_set->count; i++) {
1926 buffer_put_string(m, mech_set->elements[i].elements,
1927 mech_set->elements[i].length);
1930 #if !defined(MECHGLUE) /* mechglue memory management bug ??? */
1931 gss_release_oid_set(&minor,&mech_set);
1934 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
1940 mm_answer_gss_localname(int socket, Buffer *m) {
1943 ssh_gssapi_localname(&name);
1947 buffer_put_cstring(m, name);
1948 debug3("%s: sending result %s", __func__, name);
1951 buffer_put_cstring(m, "");
1952 debug3("%s: sending result \"\"", __func__);
1955 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);