1 /* $OpenBSD: monitor.c,v 1.101 2009/02/12 03:26:22 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>
31 #include <sys/param.h>
32 #include <sys/socket.h>
33 #include "openbsd-compat/sys-tree.h"
52 #include <openssl/dh.h>
54 #include "openbsd-compat/sys-queue.h"
64 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
67 #define TARGET_OS_MAC 1
72 #include "auth-options.h"
81 #include "monitor_mm.h"
85 #include "monitor_wrap.h"
86 #include "monitor_fdpass.h"
93 static Gssctxt *gsscontext = NULL;
97 extern ServerOptions options;
98 extern u_int utmp_len;
99 extern Newkeys *current_keys[];
100 extern z_stream incoming_stream;
101 extern z_stream outgoing_stream;
102 extern u_char session_id[];
103 extern Buffer input, output;
104 extern Buffer auth_debug;
105 extern int auth_debug_init;
106 extern Buffer loginmsg;
108 /* State exported from the child */
131 /* Functions on the monitor that answer unprivileged requests */
133 int mm_answer_moduli(int, Buffer *);
134 int mm_answer_sign(int, Buffer *);
135 int mm_answer_pwnamallow(int, Buffer *);
136 int mm_answer_auth2_read_banner(int, Buffer *);
137 int mm_answer_authserv(int, Buffer *);
138 int mm_answer_authpassword(int, Buffer *);
139 int mm_answer_bsdauthquery(int, Buffer *);
140 int mm_answer_bsdauthrespond(int, Buffer *);
141 int mm_answer_skeyquery(int, Buffer *);
142 int mm_answer_skeyrespond(int, Buffer *);
143 int mm_answer_keyallowed(int, Buffer *);
144 int mm_answer_keyverify(int, Buffer *);
145 int mm_answer_pty(int, Buffer *);
146 int mm_answer_pty_cleanup(int, Buffer *);
147 int mm_answer_term(int, Buffer *);
148 int mm_answer_rsa_keyallowed(int, Buffer *);
149 int mm_answer_rsa_challenge(int, Buffer *);
150 int mm_answer_rsa_response(int, Buffer *);
151 int mm_answer_sesskey(int, Buffer *);
152 int mm_answer_sessid(int, Buffer *);
153 int mm_answer_jpake_get_pwdata(int, Buffer *);
154 int mm_answer_jpake_step1(int, Buffer *);
155 int mm_answer_jpake_step2(int, Buffer *);
156 int mm_answer_jpake_key_confirm(int, Buffer *);
157 int mm_answer_jpake_check_confirm(int, Buffer *);
160 int mm_answer_pam_start(int, Buffer *);
161 int mm_answer_pam_account(int, Buffer *);
162 int mm_answer_pam_init_ctx(int, Buffer *);
163 int mm_answer_pam_query(int, Buffer *);
164 int mm_answer_pam_respond(int, Buffer *);
165 int mm_answer_pam_free_ctx(int, Buffer *);
169 int mm_answer_gss_setup_ctx(int, Buffer *);
170 int mm_answer_gss_accept_ctx(int, Buffer *);
171 int mm_answer_gss_userok(int, Buffer *);
172 int mm_answer_gss_checkmic(int, Buffer *);
173 int mm_answer_gss_sign(int, Buffer *);
174 int mm_answer_gss_updatecreds(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},
244 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
247 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata},
248 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1},
249 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2},
250 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm},
251 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm},
256 struct mon_table mon_dispatch_postauth20[] = {
258 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
259 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
260 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
261 {MONITOR_REQ_GSSUPCREDS, 0, mm_answer_gss_updatecreds},
263 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
264 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
265 {MONITOR_REQ_PTY, 0, mm_answer_pty},
266 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
267 {MONITOR_REQ_TERM, 0, mm_answer_term},
268 #ifdef SSH_AUDIT_EVENTS
269 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
270 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
275 struct mon_table mon_dispatch_proto15[] = {
276 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
277 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
278 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
279 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
280 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
281 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
282 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
283 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
285 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
286 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
289 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
290 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
293 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
294 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
295 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
296 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
297 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
298 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
300 #ifdef SSH_AUDIT_EVENTS
301 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
306 struct mon_table mon_dispatch_postauth15[] = {
307 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
308 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
309 {MONITOR_REQ_TERM, 0, mm_answer_term},
310 #ifdef SSH_AUDIT_EVENTS
311 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
312 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
317 struct mon_table *mon_dispatch;
319 /* Specifies if a certain message is allowed at the moment */
322 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
324 while (ent->f != NULL) {
325 if (ent->type == type) {
326 ent->flags &= ~MON_PERMIT;
327 ent->flags |= permit ? MON_PERMIT : 0;
335 monitor_permit_authentications(int permit)
337 struct mon_table *ent = mon_dispatch;
339 while (ent->f != NULL) {
340 if (ent->flags & MON_AUTH) {
341 ent->flags &= ~MON_PERMIT;
342 ent->flags |= permit ? MON_PERMIT : 0;
349 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
351 struct mon_table *ent;
352 int authenticated = 0;
354 debug3("preauth child monitor started");
356 authctxt = _authctxt;
357 memset(authctxt, 0, sizeof(*authctxt));
359 authctxt->loginmsg = &loginmsg;
362 mon_dispatch = mon_dispatch_proto20;
364 /* Permit requests for moduli and signatures */
365 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
366 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
368 /* and for the GSSAPI key exchange */
369 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
372 mon_dispatch = mon_dispatch_proto15;
374 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
377 /* The first few requests do not require asynchronous access */
378 while (!authenticated) {
379 auth_method = "unknown";
380 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
382 if (!(ent->flags & MON_AUTHDECIDE))
383 fatal("%s: unexpected authentication from %d",
384 __func__, ent->type);
385 if (authctxt->pw->pw_uid == 0 &&
386 !auth_root_allowed(auth_method))
389 /* PAM needs to perform account checks after auth */
390 if (options.use_pam && authenticated) {
394 mm_request_receive_expect(pmonitor->m_sendfd,
395 MONITOR_REQ_PAM_ACCOUNT, &m);
396 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
402 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
403 auth_log(authctxt, authenticated, auth_method,
404 compat20 ? " ssh2" : "");
406 authctxt->failures++;
409 /* Cleanup JPAKE context after authentication */
410 if (ent->flags & MON_AUTHDECIDE) {
411 if (authctxt->jpake_ctx != NULL) {
412 jpake_free(authctxt->jpake_ctx);
413 authctxt->jpake_ctx = NULL;
419 if (!authctxt->valid)
420 fatal("%s: authenticated invalid user", __func__);
421 if (strcmp(auth_method, "unknown") == 0)
422 fatal("%s: authentication method name unknown", __func__);
424 debug("%s: %s has been authenticated by privileged process",
425 __func__, authctxt->user);
427 mm_get_keystate(pmonitor);
431 monitor_set_child_handler(pid_t pid)
433 monitor_child_pid = pid;
437 monitor_child_handler(int sig)
439 kill(monitor_child_pid, sig);
443 monitor_child_postauth(struct monitor *pmonitor)
445 monitor_set_child_handler(pmonitor->m_pid);
446 signal(SIGHUP, &monitor_child_handler);
447 signal(SIGTERM, &monitor_child_handler);
448 signal(SIGINT, &monitor_child_handler);
451 mon_dispatch = mon_dispatch_postauth20;
453 /* Permit requests for moduli and signatures */
454 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
455 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
456 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
458 /* and for the GSSAPI key exchange */
459 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
462 mon_dispatch = mon_dispatch_postauth15;
463 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
466 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
467 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
471 monitor_read(pmonitor, mon_dispatch, NULL);
475 monitor_sync(struct monitor *pmonitor)
477 if (options.compression) {
478 /* The member allocation is not visible, so sync it */
479 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
484 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
485 struct mon_table **pent)
493 mm_request_receive(pmonitor->m_sendfd, &m);
494 type = buffer_get_char(&m);
496 debug3("%s: checking request %d", __func__, type);
498 while (ent->f != NULL) {
499 if (ent->type == type)
504 if (ent->f != NULL) {
505 if (!(ent->flags & MON_PERMIT))
506 fatal("%s: unpermitted request %d", __func__,
508 ret = (*ent->f)(pmonitor->m_sendfd, &m);
511 /* The child may use this request only once, disable it */
512 if (ent->flags & MON_ONCE) {
513 debug2("%s: %d used once, disabling now", __func__,
515 ent->flags &= ~MON_PERMIT;
524 fatal("%s: unsupported request: %d", __func__, type);
530 /* allowed key state */
532 monitor_allowed_key(u_char *blob, u_int bloblen)
534 /* make sure key is allowed */
535 if (key_blob == NULL || key_bloblen != bloblen ||
536 memcmp(key_blob, blob, key_bloblen))
542 monitor_reset_key_state(void)
545 if (key_blob != NULL)
547 if (hostbased_cuser != NULL)
548 xfree(hostbased_cuser);
549 if (hostbased_chost != NULL)
550 xfree(hostbased_chost);
553 key_blobtype = MM_NOKEY;
554 hostbased_cuser = NULL;
555 hostbased_chost = NULL;
559 mm_answer_moduli(int sock, Buffer *m)
564 min = buffer_get_int(m);
565 want = buffer_get_int(m);
566 max = buffer_get_int(m);
568 debug3("%s: got parameters: %d %d %d",
569 __func__, min, want, max);
570 /* We need to check here, too, in case the child got corrupted */
571 if (max < min || want < min || max < want)
572 fatal("%s: bad parameters: %d %d %d",
573 __func__, min, want, max);
577 dh = choose_dh(min, want, max);
579 buffer_put_char(m, 0);
582 /* Send first bignum */
583 buffer_put_char(m, 1);
584 buffer_put_bignum2(m, dh->p);
585 buffer_put_bignum2(m, dh->g);
589 mm_request_send(sock, MONITOR_ANS_MODULI, m);
594 mm_answer_sign(int sock, Buffer *m)
599 u_int siglen, datlen;
602 debug3("%s", __func__);
604 keyid = buffer_get_int(m);
605 p = buffer_get_string(m, &datlen);
608 * Supported KEX types will only return SHA1 (20 byte) or
609 * SHA256 (32 byte) hashes
611 if (datlen != 20 && datlen != 32)
612 fatal("%s: data length incorrect: %u", __func__, datlen);
614 /* save session id, it will be passed on the first call */
615 if (session_id2_len == 0) {
616 session_id2_len = datlen;
617 session_id2 = xmalloc(session_id2_len);
618 memcpy(session_id2, p, session_id2_len);
621 if ((key = get_hostkey_by_index(keyid)) == NULL)
622 fatal("%s: no hostkey from index %d", __func__, keyid);
623 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
624 fatal("%s: key_sign failed", __func__);
626 debug3("%s: signature %p(%u)", __func__, signature, siglen);
629 buffer_put_string(m, signature, siglen);
634 mm_request_send(sock, MONITOR_ANS_SIGN, m);
636 /* Turn on permissions for getpwnam */
637 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
642 /* Retrieves the password entry and also checks if the user is permitted */
645 mm_answer_pwnamallow(int sock, Buffer *m)
648 struct passwd *pwent;
651 debug3("%s", __func__);
653 if (authctxt->attempt++ != 0)
654 fatal("%s: multiple attempts for getpwnam", __func__);
656 username = buffer_get_string(m, NULL);
658 pwent = getpwnamallow(username);
660 authctxt->user = xstrdup(username);
661 setproctitle("%s [priv]", pwent ? username : "unknown");
667 buffer_put_char(m, 0);
668 authctxt->pw = fakepw();
673 authctxt->pw = pwent;
676 buffer_put_char(m, 1);
677 buffer_put_string(m, pwent, sizeof(struct passwd));
678 buffer_put_cstring(m, pwent->pw_name);
679 buffer_put_cstring(m, "*");
680 buffer_put_cstring(m, pwent->pw_gecos);
681 #ifdef HAVE_PW_CLASS_IN_PASSWD
682 buffer_put_cstring(m, pwent->pw_class);
684 buffer_put_cstring(m, pwent->pw_dir);
685 buffer_put_cstring(m, pwent->pw_shell);
688 buffer_put_string(m, &options, sizeof(options));
689 if (options.banner != NULL)
690 buffer_put_cstring(m, options.banner);
691 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
692 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
694 /* For SSHv1 allow authentication now */
696 monitor_permit_authentications(1);
698 /* Allow service/style information on the auth context */
699 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
700 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
705 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
711 int mm_answer_auth2_read_banner(int sock, Buffer *m)
716 banner = auth2_read_banner();
717 buffer_put_cstring(m, banner != NULL ? banner : "");
718 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
727 mm_answer_authserv(int sock, Buffer *m)
729 monitor_permit_authentications(1);
731 authctxt->service = buffer_get_string(m, NULL);
732 authctxt->style = buffer_get_string(m, NULL);
733 debug3("%s: service=%s, style=%s",
734 __func__, authctxt->service, authctxt->style);
736 if (strlen(authctxt->style) == 0) {
737 xfree(authctxt->style);
738 authctxt->style = NULL;
745 mm_answer_authpassword(int sock, Buffer *m)
747 static int call_count;
752 passwd = buffer_get_string(m, &plen);
753 /* Only authenticate if the context is valid */
754 authenticated = options.password_authentication &&
755 auth_password(authctxt, passwd);
756 memset(passwd, 0, strlen(passwd));
760 buffer_put_int(m, authenticated);
762 debug3("%s: sending result %d", __func__, authenticated);
763 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
766 if (plen == 0 && call_count == 1)
767 auth_method = "none";
769 auth_method = "password";
771 /* Causes monitor loop to terminate if authenticated */
772 return (authenticated);
777 mm_answer_bsdauthquery(int sock, Buffer *m)
779 char *name, *infotxt;
785 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
786 &prompts, &echo_on) < 0 ? 0 : 1;
789 buffer_put_int(m, success);
791 buffer_put_cstring(m, prompts[0]);
793 debug3("%s: sending challenge success: %u", __func__, success);
794 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
807 mm_answer_bsdauthrespond(int sock, Buffer *m)
812 if (authctxt->as == 0)
813 fatal("%s: no bsd auth session", __func__);
815 response = buffer_get_string(m, NULL);
816 authok = options.challenge_response_authentication &&
817 auth_userresponse(authctxt->as, response, 0);
819 debug3("%s: <%s> = <%d>", __func__, response, authok);
823 buffer_put_int(m, authok);
825 debug3("%s: sending authenticated: %d", __func__, authok);
826 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
828 auth_method = "bsdauth";
830 return (authok != 0);
836 mm_answer_skeyquery(int sock, Buffer *m)
839 char challenge[1024];
842 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
843 sizeof(challenge)) < 0 ? 0 : 1;
846 buffer_put_int(m, success);
848 buffer_put_cstring(m, challenge);
850 debug3("%s: sending challenge success: %u", __func__, success);
851 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
857 mm_answer_skeyrespond(int sock, Buffer *m)
862 response = buffer_get_string(m, NULL);
864 authok = (options.challenge_response_authentication &&
866 skey_haskey(authctxt->pw->pw_name) == 0 &&
867 skey_passcheck(authctxt->pw->pw_name, response) != -1);
872 buffer_put_int(m, authok);
874 debug3("%s: sending authenticated: %d", __func__, authok);
875 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
877 auth_method = "skey";
879 return (authok != 0);
885 mm_answer_pam_start(int sock, Buffer *m)
887 if (!options.use_pam)
888 fatal("UsePAM not set, but ended up in %s anyway", __func__);
892 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
898 mm_answer_pam_account(int sock, Buffer *m)
902 if (!options.use_pam)
903 fatal("UsePAM not set, but ended up in %s anyway", __func__);
905 ret = do_pam_account();
907 buffer_put_int(m, ret);
908 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
910 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
915 static void *sshpam_ctxt, *sshpam_authok;
916 extern KbdintDevice sshpam_device;
919 mm_answer_pam_init_ctx(int sock, Buffer *m)
922 debug3("%s", __func__);
923 authctxt->user = buffer_get_string(m, NULL);
924 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
925 sshpam_authok = NULL;
927 if (sshpam_ctxt != NULL) {
928 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
929 buffer_put_int(m, 1);
931 buffer_put_int(m, 0);
933 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
938 mm_answer_pam_query(int sock, Buffer *m)
940 char *name, *info, **prompts;
941 u_int i, num, *echo_on;
944 debug3("%s", __func__);
945 sshpam_authok = NULL;
946 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
947 if (ret == 0 && num == 0)
948 sshpam_authok = sshpam_ctxt;
949 if (num > 1 || name == NULL || info == NULL)
952 buffer_put_int(m, ret);
953 buffer_put_cstring(m, name);
955 buffer_put_cstring(m, info);
957 buffer_put_int(m, num);
958 for (i = 0; i < num; ++i) {
959 buffer_put_cstring(m, prompts[i]);
961 buffer_put_int(m, echo_on[i]);
967 auth_method = "keyboard-interactive/pam";
968 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
973 mm_answer_pam_respond(int sock, Buffer *m)
979 debug3("%s", __func__);
980 sshpam_authok = NULL;
981 num = buffer_get_int(m);
983 resp = xcalloc(num, sizeof(char *));
984 for (i = 0; i < num; ++i)
985 resp[i] = buffer_get_string(m, NULL);
986 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
987 for (i = 0; i < num; ++i)
991 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
994 buffer_put_int(m, ret);
995 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
996 auth_method = "keyboard-interactive/pam";
998 sshpam_authok = sshpam_ctxt;
1003 mm_answer_pam_free_ctx(int sock, Buffer *m)
1006 debug3("%s", __func__);
1007 (sshpam_device.free_ctx)(sshpam_ctxt);
1009 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
1010 auth_method = "keyboard-interactive/pam";
1011 return (sshpam_authok == sshpam_ctxt);
1016 mm_append_debug(Buffer *m)
1018 if (auth_debug_init && buffer_len(&auth_debug)) {
1019 debug3("%s: Appending debug messages for child", __func__);
1020 buffer_append(m, buffer_ptr(&auth_debug),
1021 buffer_len(&auth_debug));
1022 buffer_clear(&auth_debug);
1027 mm_answer_keyallowed(int sock, Buffer *m)
1030 char *cuser, *chost;
1033 enum mm_keytype type = 0;
1036 debug3("%s entering", __func__);
1038 type = buffer_get_int(m);
1039 cuser = buffer_get_string(m, NULL);
1040 chost = buffer_get_string(m, NULL);
1041 blob = buffer_get_string(m, &bloblen);
1043 key = key_from_blob(blob, bloblen);
1045 if ((compat20 && type == MM_RSAHOSTKEY) ||
1046 (!compat20 && type != MM_RSAHOSTKEY))
1047 fatal("%s: key type and protocol mismatch", __func__);
1049 debug3("%s: key_from_blob: %p", __func__, key);
1051 if (key != NULL && authctxt->valid) {
1054 allowed = options.pubkey_authentication &&
1055 user_key_allowed(authctxt->pw, key);
1056 auth_method = "publickey";
1057 if (options.pubkey_authentication && allowed != 1)
1058 auth_clear_options();
1061 allowed = options.hostbased_authentication &&
1062 hostbased_key_allowed(authctxt->pw,
1064 auth_method = "hostbased";
1067 key->type = KEY_RSA1; /* XXX */
1068 allowed = options.rhosts_rsa_authentication &&
1069 auth_rhosts_rsa_key_allowed(authctxt->pw,
1071 if (options.rhosts_rsa_authentication && allowed != 1)
1072 auth_clear_options();
1073 auth_method = "rsa";
1076 fatal("%s: unknown key type %d", __func__, type);
1083 /* clear temporarily storage (used by verify) */
1084 monitor_reset_key_state();
1087 /* Save temporarily for comparison in verify */
1089 key_bloblen = bloblen;
1090 key_blobtype = type;
1091 hostbased_cuser = cuser;
1092 hostbased_chost = chost;
1094 /* Log failed attempt */
1095 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
1101 debug3("%s: key %p is %s",
1102 __func__, key, allowed ? "allowed" : "not allowed");
1105 buffer_put_int(m, allowed);
1106 buffer_put_int(m, forced_command != NULL);
1110 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1112 if (type == MM_RSAHOSTKEY)
1113 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1119 monitor_valid_userblob(u_char *data, u_int datalen)
1127 buffer_append(&b, data, datalen);
1129 if (datafellows & SSH_OLD_SESSIONID) {
1131 len = buffer_len(&b);
1132 if ((session_id2 == NULL) ||
1133 (len < session_id2_len) ||
1134 (memcmp(p, session_id2, session_id2_len) != 0))
1136 buffer_consume(&b, session_id2_len);
1138 p = buffer_get_string(&b, &len);
1139 if ((session_id2 == NULL) ||
1140 (len != session_id2_len) ||
1141 (memcmp(p, session_id2, session_id2_len) != 0))
1145 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1147 p = buffer_get_string(&b, NULL);
1148 if (strcmp(authctxt->user, p) != 0) {
1149 logit("wrong user name passed to monitor: expected %s != %.100s",
1154 buffer_skip_string(&b);
1155 if (datafellows & SSH_BUG_PKAUTH) {
1156 if (!buffer_get_char(&b))
1159 p = buffer_get_string(&b, NULL);
1160 if (strcmp("publickey", p) != 0)
1163 if (!buffer_get_char(&b))
1165 buffer_skip_string(&b);
1167 buffer_skip_string(&b);
1168 if (buffer_len(&b) != 0)
1175 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1184 buffer_append(&b, data, datalen);
1186 p = buffer_get_string(&b, &len);
1187 if ((session_id2 == NULL) ||
1188 (len != session_id2_len) ||
1189 (memcmp(p, session_id2, session_id2_len) != 0))
1193 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1195 p = buffer_get_string(&b, NULL);
1196 if (strcmp(authctxt->user, p) != 0) {
1197 logit("wrong user name passed to monitor: expected %s != %.100s",
1202 buffer_skip_string(&b); /* service */
1203 p = buffer_get_string(&b, NULL);
1204 if (strcmp(p, "hostbased") != 0)
1207 buffer_skip_string(&b); /* pkalg */
1208 buffer_skip_string(&b); /* pkblob */
1210 /* verify client host, strip trailing dot if necessary */
1211 p = buffer_get_string(&b, NULL);
1212 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1214 if (strcmp(p, chost) != 0)
1218 /* verify client user */
1219 p = buffer_get_string(&b, NULL);
1220 if (strcmp(p, cuser) != 0)
1224 if (buffer_len(&b) != 0)
1231 mm_answer_keyverify(int sock, Buffer *m)
1234 u_char *signature, *data, *blob;
1235 u_int signaturelen, datalen, bloblen;
1239 blob = buffer_get_string(m, &bloblen);
1240 signature = buffer_get_string(m, &signaturelen);
1241 data = buffer_get_string(m, &datalen);
1243 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1244 !monitor_allowed_key(blob, bloblen))
1245 fatal("%s: bad key, not previously allowed", __func__);
1247 key = key_from_blob(blob, bloblen);
1249 fatal("%s: bad public key blob", __func__);
1251 switch (key_blobtype) {
1253 valid_data = monitor_valid_userblob(data, datalen);
1256 valid_data = monitor_valid_hostbasedblob(data, datalen,
1257 hostbased_cuser, hostbased_chost);
1264 fatal("%s: bad signature data blob", __func__);
1266 verified = key_verify(key, signature, signaturelen, data, datalen);
1267 debug3("%s: key %p signature %s",
1268 __func__, key, (verified == 1) ? "verified" : "unverified");
1275 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1277 monitor_reset_key_state();
1280 buffer_put_int(m, verified);
1281 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1283 return (verified == 1);
1287 mm_record_login(Session *s, struct passwd *pw)
1290 struct sockaddr_storage from;
1293 * Get IP address of client. If the connection is not a socket, let
1294 * the address be 0.0.0.0.
1296 memset(&from, 0, sizeof(from));
1297 fromlen = sizeof(from);
1298 if (packet_connection_is_on_socket()) {
1299 if (getpeername(packet_get_connection_in(),
1300 (struct sockaddr *)&from, &fromlen) < 0) {
1301 debug("getpeername: %.100s", strerror(errno));
1305 /* Record that there was a login on that tty from the remote host. */
1306 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1307 get_remote_name_or_ip(utmp_len, options.use_dns),
1308 (struct sockaddr *)&from, fromlen);
1312 mm_session_close(Session *s)
1314 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1315 if (s->ttyfd != -1) {
1316 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1317 session_pty_cleanup2(s);
1319 session_unused(s->self);
1323 mm_answer_pty(int sock, Buffer *m)
1325 extern struct monitor *pmonitor;
1329 debug3("%s entering", __func__);
1335 s->authctxt = authctxt;
1336 s->pw = authctxt->pw;
1337 s->pid = pmonitor->m_pid;
1338 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1341 pty_setowner(authctxt->pw, s->tty);
1343 buffer_put_int(m, 1);
1344 buffer_put_cstring(m, s->tty);
1346 /* We need to trick ttyslot */
1347 if (dup2(s->ttyfd, 0) == -1)
1348 fatal("%s: dup2", __func__);
1350 mm_record_login(s, authctxt->pw);
1352 /* Now we can close the file descriptor again */
1355 /* send messages generated by record_login */
1356 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1357 buffer_clear(&loginmsg);
1359 mm_request_send(sock, MONITOR_ANS_PTY, m);
1361 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1362 mm_send_fd(sock, s->ttyfd) == -1)
1363 fatal("%s: send fds failed", __func__);
1365 /* make sure nothing uses fd 0 */
1366 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1367 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1369 error("%s: fd0 %d != 0", __func__, fd0);
1371 /* slave is not needed */
1373 s->ttyfd = s->ptyfd;
1374 /* no need to dup() because nobody closes ptyfd */
1375 s->ptymaster = s->ptyfd;
1377 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1383 mm_session_close(s);
1384 buffer_put_int(m, 0);
1385 mm_request_send(sock, MONITOR_ANS_PTY, m);
1390 mm_answer_pty_cleanup(int sock, Buffer *m)
1395 debug3("%s entering", __func__);
1397 tty = buffer_get_string(m, NULL);
1398 if ((s = session_by_tty(tty)) != NULL)
1399 mm_session_close(s);
1406 mm_answer_sesskey(int sock, Buffer *m)
1411 /* Turn off permissions */
1412 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1414 if ((p = BN_new()) == NULL)
1415 fatal("%s: BN_new", __func__);
1417 buffer_get_bignum2(m, p);
1419 rsafail = ssh1_session_key(p);
1422 buffer_put_int(m, rsafail);
1423 buffer_put_bignum2(m, p);
1427 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1429 /* Turn on permissions for sessid passing */
1430 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1436 mm_answer_sessid(int sock, Buffer *m)
1440 debug3("%s entering", __func__);
1442 if (buffer_len(m) != 16)
1443 fatal("%s: bad ssh1 session id", __func__);
1444 for (i = 0; i < 16; i++)
1445 session_id[i] = buffer_get_char(m);
1447 /* Turn on permissions for getpwnam */
1448 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1454 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1458 u_char *blob = NULL;
1462 debug3("%s entering", __func__);
1464 auth_method = "rsa";
1465 if (options.rsa_authentication && authctxt->valid) {
1466 if ((client_n = BN_new()) == NULL)
1467 fatal("%s: BN_new", __func__);
1468 buffer_get_bignum2(m, client_n);
1469 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1470 BN_clear_free(client_n);
1473 buffer_put_int(m, allowed);
1474 buffer_put_int(m, forced_command != NULL);
1476 /* clear temporarily storage (used by generate challenge) */
1477 monitor_reset_key_state();
1479 if (allowed && key != NULL) {
1480 key->type = KEY_RSA; /* cheat for key_to_blob */
1481 if (key_to_blob(key, &blob, &blen) == 0)
1482 fatal("%s: key_to_blob failed", __func__);
1483 buffer_put_string(m, blob, blen);
1485 /* Save temporarily for comparison in verify */
1488 key_blobtype = MM_RSAUSERKEY;
1495 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1497 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1498 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1503 mm_answer_rsa_challenge(int sock, Buffer *m)
1509 debug3("%s entering", __func__);
1511 if (!authctxt->valid)
1512 fatal("%s: authctxt not valid", __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", __func__);
1518 if ((key = key_from_blob(blob, blen)) == NULL)
1519 fatal("%s: received bad key", __func__);
1520 if (key->type != KEY_RSA)
1521 fatal("%s: received bad key type %d", __func__, key->type);
1522 key->type = KEY_RSA1;
1524 BN_clear_free(ssh1_challenge);
1525 ssh1_challenge = auth_rsa_generate_challenge(key);
1528 buffer_put_bignum2(m, ssh1_challenge);
1530 debug3("%s sending reply", __func__);
1531 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1533 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1541 mm_answer_rsa_response(int sock, Buffer *m)
1544 u_char *blob, *response;
1548 debug3("%s entering", __func__);
1550 if (!authctxt->valid)
1551 fatal("%s: authctxt not valid", __func__);
1552 if (ssh1_challenge == NULL)
1553 fatal("%s: no ssh1_challenge", __func__);
1555 blob = buffer_get_string(m, &blen);
1556 if (!monitor_allowed_key(blob, blen))
1557 fatal("%s: bad key, not previously allowed", __func__);
1558 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1559 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1560 if ((key = key_from_blob(blob, blen)) == NULL)
1561 fatal("%s: received bad key", __func__);
1562 response = buffer_get_string(m, &len);
1564 fatal("%s: received bad response to challenge", __func__);
1565 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1571 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1574 BN_clear_free(ssh1_challenge);
1575 ssh1_challenge = NULL;
1576 monitor_reset_key_state();
1579 buffer_put_int(m, success);
1580 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1586 mm_answer_term(int sock, Buffer *req)
1588 extern struct monitor *pmonitor;
1591 debug3("%s: tearing down sessions", __func__);
1593 /* The child is terminating */
1594 session_destroy_all(&mm_session_close);
1597 if (options.use_pam)
1601 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1605 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1607 /* Terminate process */
1611 #ifdef SSH_AUDIT_EVENTS
1612 /* Report that an audit event occurred */
1614 mm_answer_audit_event(int socket, Buffer *m)
1616 ssh_audit_event_t event;
1618 debug3("%s entering", __func__);
1620 event = buffer_get_int(m);
1622 case SSH_AUTH_FAIL_PUBKEY:
1623 case SSH_AUTH_FAIL_HOSTBASED:
1624 case SSH_AUTH_FAIL_GSSAPI:
1625 case SSH_LOGIN_EXCEED_MAXTRIES:
1626 case SSH_LOGIN_ROOT_DENIED:
1627 case SSH_CONNECTION_CLOSE:
1628 case SSH_INVALID_USER:
1632 fatal("Audit event type %d not permitted", event);
1639 mm_answer_audit_command(int socket, Buffer *m)
1644 debug3("%s entering", __func__);
1645 cmd = buffer_get_string(m, &len);
1646 /* sanity check command, if so how? */
1647 audit_run_command(cmd);
1651 #endif /* SSH_AUDIT_EVENTS */
1654 monitor_apply_keystate(struct monitor *pmonitor)
1657 set_newkeys(MODE_IN);
1658 set_newkeys(MODE_OUT);
1660 packet_set_protocol_flags(child_state.ssh1protoflags);
1661 packet_set_encryption_key(child_state.ssh1key,
1662 child_state.ssh1keylen, child_state.ssh1cipher);
1663 xfree(child_state.ssh1key);
1666 /* for rc4 and other stateful ciphers */
1667 packet_set_keycontext(MODE_OUT, child_state.keyout);
1668 xfree(child_state.keyout);
1669 packet_set_keycontext(MODE_IN, child_state.keyin);
1670 xfree(child_state.keyin);
1673 packet_set_iv(MODE_OUT, child_state.ivout);
1674 xfree(child_state.ivout);
1675 packet_set_iv(MODE_IN, child_state.ivin);
1676 xfree(child_state.ivin);
1679 memcpy(&incoming_stream, &child_state.incoming,
1680 sizeof(incoming_stream));
1681 memcpy(&outgoing_stream, &child_state.outgoing,
1682 sizeof(outgoing_stream));
1684 /* Update with new address */
1685 if (options.compression)
1686 mm_init_compression(pmonitor->m_zlib);
1688 /* Network I/O buffers */
1689 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1690 buffer_clear(&input);
1691 buffer_append(&input, child_state.input, child_state.ilen);
1692 memset(child_state.input, 0, child_state.ilen);
1693 xfree(child_state.input);
1695 buffer_clear(&output);
1696 buffer_append(&output, child_state.output, child_state.olen);
1697 memset(child_state.output, 0, child_state.olen);
1698 xfree(child_state.output);
1702 mm_get_kex(Buffer *m)
1708 kex = xcalloc(1, sizeof(*kex));
1709 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1710 if ((session_id2 == NULL) ||
1711 (kex->session_id_len != session_id2_len) ||
1712 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1713 fatal("mm_get_get: internal error: bad session id");
1714 kex->we_need = buffer_get_int(m);
1715 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1716 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1717 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1718 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1720 if (options.gss_keyex) {
1721 kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
1722 kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server;
1723 kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server;
1727 kex->hostkey_type = buffer_get_int(m);
1728 kex->kex_type = buffer_get_int(m);
1729 blob = buffer_get_string(m, &bloblen);
1730 buffer_init(&kex->my);
1731 buffer_append(&kex->my, blob, bloblen);
1733 blob = buffer_get_string(m, &bloblen);
1734 buffer_init(&kex->peer);
1735 buffer_append(&kex->peer, blob, bloblen);
1738 kex->flags = buffer_get_int(m);
1739 kex->client_version_string = buffer_get_string(m, NULL);
1740 kex->server_version_string = buffer_get_string(m, NULL);
1741 kex->load_host_key=&get_hostkey_by_type;
1742 kex->host_key_index=&get_hostkey_index;
1747 /* This function requries careful sanity checking */
1750 mm_get_keystate(struct monitor *pmonitor)
1754 u_int bloblen, plen;
1755 u_int32_t seqnr, packets;
1756 u_int64_t blocks, bytes;
1758 debug3("%s: Waiting for new keys", __func__);
1761 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1763 child_state.ssh1protoflags = buffer_get_int(&m);
1764 child_state.ssh1cipher = buffer_get_int(&m);
1765 child_state.ssh1key = buffer_get_string(&m,
1766 &child_state.ssh1keylen);
1767 child_state.ivout = buffer_get_string(&m,
1768 &child_state.ivoutlen);
1769 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1772 /* Get the Kex for rekeying */
1773 *pmonitor->m_pkex = mm_get_kex(&m);
1776 blob = buffer_get_string(&m, &bloblen);
1777 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1780 debug3("%s: Waiting for second key", __func__);
1781 blob = buffer_get_string(&m, &bloblen);
1782 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1785 /* Now get sequence numbers for the packets */
1786 seqnr = buffer_get_int(&m);
1787 blocks = buffer_get_int64(&m);
1788 packets = buffer_get_int(&m);
1789 bytes = buffer_get_int64(&m);
1790 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1791 seqnr = buffer_get_int(&m);
1792 blocks = buffer_get_int64(&m);
1793 packets = buffer_get_int(&m);
1794 bytes = buffer_get_int64(&m);
1795 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1798 /* Get the key context */
1799 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1800 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1802 debug3("%s: Getting compression state", __func__);
1803 /* Get compression state */
1804 p = buffer_get_string(&m, &plen);
1805 if (plen != sizeof(child_state.outgoing))
1806 fatal("%s: bad request size", __func__);
1807 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1810 p = buffer_get_string(&m, &plen);
1811 if (plen != sizeof(child_state.incoming))
1812 fatal("%s: bad request size", __func__);
1813 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1816 /* Network I/O buffers */
1817 debug3("%s: Getting Network I/O buffers", __func__);
1818 child_state.input = buffer_get_string(&m, &child_state.ilen);
1819 child_state.output = buffer_get_string(&m, &child_state.olen);
1825 /* Allocation functions for zlib */
1827 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1829 size_t len = (size_t) size * ncount;
1832 if (len == 0 || ncount > SIZE_T_MAX / size)
1833 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1835 address = mm_malloc(mm, len);
1841 mm_zfree(struct mm_master *mm, void *address)
1843 mm_free(mm, address);
1847 mm_init_compression(struct mm_master *mm)
1849 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1850 outgoing_stream.zfree = (free_func)mm_zfree;
1851 outgoing_stream.opaque = mm;
1853 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1854 incoming_stream.zfree = (free_func)mm_zfree;
1855 incoming_stream.opaque = mm;
1860 #define FD_CLOSEONEXEC(x) do { \
1861 if (fcntl(x, F_SETFD, 1) == -1) \
1862 fatal("fcntl(%d, F_SETFD)", x); \
1866 monitor_socketpair(int *pair)
1868 #ifdef HAVE_SOCKETPAIR
1869 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1870 fatal("%s: socketpair", __func__);
1872 fatal("%s: UsePrivilegeSeparation=yes not supported",
1875 FD_CLOSEONEXEC(pair[0]);
1876 FD_CLOSEONEXEC(pair[1]);
1879 #define MM_MEMSIZE 65536
1884 struct monitor *mon;
1887 mon = xcalloc(1, sizeof(*mon));
1889 monitor_socketpair(pair);
1891 mon->m_recvfd = pair[0];
1892 mon->m_sendfd = pair[1];
1894 /* Used to share zlib space across processes */
1895 if (options.compression) {
1896 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1897 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1899 /* Compression needs to share state across borders */
1900 mm_init_compression(mon->m_zlib);
1907 monitor_reinit(struct monitor *mon)
1911 monitor_socketpair(pair);
1913 mon->m_recvfd = pair[0];
1914 mon->m_sendfd = pair[1];
1919 mm_answer_gss_setup_ctx(int sock, Buffer *m)
1925 if (!options.gss_authentication && !options.gss_keyex)
1926 fatal("In GSSAPI monitor when GSSAPI is disabled");
1928 goid.elements = buffer_get_string(m, &len);
1931 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1933 xfree(goid.elements);
1936 buffer_put_int(m, major);
1938 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1940 /* Now we have a context, enable the step */
1941 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1947 mm_answer_gss_accept_ctx(int sock, Buffer *m)
1950 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1951 OM_uint32 major, minor;
1952 OM_uint32 flags = 0; /* GSI needs this */
1955 if (!options.gss_authentication && !options.gss_keyex)
1956 fatal("In GSSAPI monitor when GSSAPI is disabled");
1958 in.value = buffer_get_string(m, &len);
1960 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1964 buffer_put_int(m, major);
1965 buffer_put_string(m, out.value, out.length);
1966 buffer_put_int(m, flags);
1967 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1969 gss_release_buffer(&minor, &out);
1971 if (major == GSS_S_COMPLETE) {
1972 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1973 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1974 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1975 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
1981 mm_answer_gss_checkmic(int sock, Buffer *m)
1983 gss_buffer_desc gssbuf, mic;
1987 if (!options.gss_authentication && !options.gss_keyex)
1988 fatal("In GSSAPI monitor when GSSAPI is disabled");
1990 gssbuf.value = buffer_get_string(m, &len);
1991 gssbuf.length = len;
1992 mic.value = buffer_get_string(m, &len);
1995 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1997 xfree(gssbuf.value);
2001 buffer_put_int(m, ret);
2003 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
2005 if (!GSS_ERROR(ret))
2006 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
2012 mm_answer_gss_userok(int sock, Buffer *m)
2016 if (!options.gss_authentication && !options.gss_keyex)
2017 fatal("In GSSAPI monitor when GSSAPI is disabled");
2019 authenticated = authctxt->valid &&
2020 ssh_gssapi_userok(authctxt->user, authctxt->pw);
2023 buffer_put_int(m, authenticated);
2025 debug3("%s: sending result %d", __func__, authenticated);
2026 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
2028 auth_method = "gssapi-with-mic";
2030 /* Monitor loop will terminate if authenticated */
2031 return (authenticated);
2035 mm_answer_gss_sign(int socket, Buffer *m)
2037 gss_buffer_desc data;
2038 gss_buffer_desc hash = GSS_C_EMPTY_BUFFER;
2039 OM_uint32 major, minor;
2042 if (!options.gss_authentication && !options.gss_keyex)
2043 fatal("In GSSAPI monitor when GSSAPI is disabled");
2045 data.value = buffer_get_string(m, &len);
2047 if (data.length != 20)
2048 fatal("%s: data length incorrect: %d", __func__,
2051 /* Save the session ID on the first time around */
2052 if (session_id2_len == 0) {
2053 session_id2_len = data.length;
2054 session_id2 = xmalloc(session_id2_len);
2055 memcpy(session_id2, data.value, session_id2_len);
2057 major = ssh_gssapi_sign(gsscontext, &data, &hash);
2062 buffer_put_int(m, major);
2063 buffer_put_string(m, hash.value, hash.length);
2065 mm_request_send(socket, MONITOR_ANS_GSSSIGN, m);
2067 gss_release_buffer(&minor, &hash);
2069 /* Turn on getpwnam permissions */
2070 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
2072 /* And credential updating, for when rekeying */
2073 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUPCREDS, 1);
2079 mm_answer_gss_updatecreds(int socket, Buffer *m) {
2080 ssh_gssapi_ccache store;
2083 store.filename = buffer_get_string(m, NULL);
2084 store.envvar = buffer_get_string(m, NULL);
2085 store.envval = buffer_get_string(m, NULL);
2087 ok = ssh_gssapi_update_creds(&store);
2089 xfree(store.filename);
2090 xfree(store.envvar);
2091 xfree(store.envval);
2094 buffer_put_int(m, ok);
2096 mm_request_send(socket, MONITOR_ANS_GSSUPCREDS, m);
2105 mm_answer_jpake_step1(int sock, Buffer *m)
2107 struct jpake_ctx *pctx;
2108 u_char *x3_proof, *x4_proof;
2109 u_int x3_proof_len, x4_proof_len;
2111 if (!options.zero_knowledge_password_authentication)
2112 fatal("zero_knowledge_password_authentication disabled");
2114 if (authctxt->jpake_ctx != NULL)
2115 fatal("%s: authctxt->jpake_ctx already set (%p)",
2116 __func__, authctxt->jpake_ctx);
2117 authctxt->jpake_ctx = pctx = jpake_new();
2119 jpake_step1(pctx->grp,
2120 &pctx->server_id, &pctx->server_id_len,
2121 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4,
2122 &x3_proof, &x3_proof_len,
2123 &x4_proof, &x4_proof_len);
2125 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__));
2129 buffer_put_string(m, pctx->server_id, pctx->server_id_len);
2130 buffer_put_bignum2(m, pctx->g_x3);
2131 buffer_put_bignum2(m, pctx->g_x4);
2132 buffer_put_string(m, x3_proof, x3_proof_len);
2133 buffer_put_string(m, x4_proof, x4_proof_len);
2135 debug3("%s: sending step1", __func__);
2136 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m);
2138 bzero(x3_proof, x3_proof_len);
2139 bzero(x4_proof, x4_proof_len);
2143 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1);
2144 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0);
2150 mm_answer_jpake_get_pwdata(int sock, Buffer *m)
2152 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2153 char *hash_scheme, *salt;
2156 fatal("%s: pctx == NULL", __func__);
2158 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt);
2161 /* pctx->s is sensitive, not returned to slave */
2162 buffer_put_cstring(m, hash_scheme);
2163 buffer_put_cstring(m, salt);
2165 debug3("%s: sending pwdata", __func__);
2166 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m);
2168 bzero(hash_scheme, strlen(hash_scheme));
2169 bzero(salt, strlen(salt));
2173 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1);
2179 mm_answer_jpake_step2(int sock, Buffer *m)
2181 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2182 u_char *x1_proof, *x2_proof, *x4_s_proof;
2183 u_int x1_proof_len, x2_proof_len, x4_s_proof_len;
2186 fatal("%s: pctx == NULL", __func__);
2188 if ((pctx->g_x1 = BN_new()) == NULL ||
2189 (pctx->g_x2 = BN_new()) == NULL)
2190 fatal("%s: BN_new", __func__);
2191 buffer_get_bignum2(m, pctx->g_x1);
2192 buffer_get_bignum2(m, pctx->g_x2);
2193 pctx->client_id = buffer_get_string(m, &pctx->client_id_len);
2194 x1_proof = buffer_get_string(m, &x1_proof_len);
2195 x2_proof = buffer_get_string(m, &x2_proof_len);
2197 jpake_step2(pctx->grp, pctx->s, pctx->g_x3,
2198 pctx->g_x1, pctx->g_x2, pctx->x4,
2199 pctx->client_id, pctx->client_id_len,
2200 pctx->server_id, pctx->server_id_len,
2201 x1_proof, x1_proof_len,
2202 x2_proof, x2_proof_len,
2204 &x4_s_proof, &x4_s_proof_len);
2206 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__));
2208 bzero(x1_proof, x1_proof_len);
2209 bzero(x2_proof, x2_proof_len);
2215 buffer_put_bignum2(m, pctx->b);
2216 buffer_put_string(m, x4_s_proof, x4_s_proof_len);
2218 debug3("%s: sending step2", __func__);
2219 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m);
2221 bzero(x4_s_proof, x4_s_proof_len);
2224 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1);
2230 mm_answer_jpake_key_confirm(int sock, Buffer *m)
2232 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2234 u_int x2_s_proof_len;
2237 fatal("%s: pctx == NULL", __func__);
2239 if ((pctx->a = BN_new()) == NULL)
2240 fatal("%s: BN_new", __func__);
2241 buffer_get_bignum2(m, pctx->a);
2242 x2_s_proof = buffer_get_string(m, &x2_s_proof_len);
2244 jpake_key_confirm(pctx->grp, pctx->s, pctx->a,
2245 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2,
2246 pctx->server_id, pctx->server_id_len,
2247 pctx->client_id, pctx->client_id_len,
2248 session_id2, session_id2_len,
2249 x2_s_proof, x2_s_proof_len,
2251 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len);
2253 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__));
2255 bzero(x2_s_proof, x2_s_proof_len);
2258 /* pctx->k is sensitive, not sent */
2259 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len);
2261 debug3("%s: sending confirmation hash", __func__);
2262 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m);
2264 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1);
2270 mm_answer_jpake_check_confirm(int sock, Buffer *m)
2272 int authenticated = 0;
2273 u_char *peer_confirm_hash;
2274 u_int peer_confirm_hash_len;
2275 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2278 fatal("%s: pctx == NULL", __func__);
2280 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len);
2282 authenticated = jpake_check_confirm(pctx->k,
2283 pctx->client_id, pctx->client_id_len,
2284 session_id2, session_id2_len,
2285 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid;
2287 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__));
2289 bzero(peer_confirm_hash, peer_confirm_hash_len);
2290 xfree(peer_confirm_hash);
2293 buffer_put_int(m, authenticated);
2295 debug3("%s: sending result %d", __func__, authenticated);
2296 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m);
2298 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1);
2300 auth_method = "jpake-01@openssh.com";
2301 return authenticated;