1 /* $OpenBSD: monitor.c,v 1.110 2010/09/09 10:45:45 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"
94 static Gssctxt *gsscontext = NULL;
98 extern ServerOptions options;
99 extern u_int utmp_len;
100 extern Newkeys *current_keys[];
101 extern z_stream incoming_stream;
102 extern z_stream outgoing_stream;
103 extern u_char session_id[];
104 extern Buffer auth_debug;
105 extern int auth_debug_init;
106 extern Buffer loginmsg;
108 /* State exported from the child */
129 u_int64_t sent_bytes;
130 u_int64_t recv_bytes;
133 /* Functions on the monitor that answer unprivileged requests */
135 int mm_answer_moduli(int, Buffer *);
136 int mm_answer_sign(int, Buffer *);
137 int mm_answer_pwnamallow(int, Buffer *);
138 int mm_answer_auth2_read_banner(int, Buffer *);
139 int mm_answer_authserv(int, Buffer *);
140 int mm_answer_authpassword(int, Buffer *);
141 int mm_answer_bsdauthquery(int, Buffer *);
142 int mm_answer_bsdauthrespond(int, Buffer *);
143 int mm_answer_skeyquery(int, Buffer *);
144 int mm_answer_skeyrespond(int, Buffer *);
145 int mm_answer_keyallowed(int, Buffer *);
146 int mm_answer_keyverify(int, Buffer *);
147 int mm_answer_pty(int, Buffer *);
148 int mm_answer_pty_cleanup(int, Buffer *);
149 int mm_answer_term(int, Buffer *);
150 int mm_answer_rsa_keyallowed(int, Buffer *);
151 int mm_answer_rsa_challenge(int, Buffer *);
152 int mm_answer_rsa_response(int, Buffer *);
153 int mm_answer_sesskey(int, Buffer *);
154 int mm_answer_sessid(int, Buffer *);
155 int mm_answer_jpake_get_pwdata(int, Buffer *);
156 int mm_answer_jpake_step1(int, Buffer *);
157 int mm_answer_jpake_step2(int, Buffer *);
158 int mm_answer_jpake_key_confirm(int, Buffer *);
159 int mm_answer_jpake_check_confirm(int, Buffer *);
162 int mm_answer_pam_start(int, Buffer *);
163 int mm_answer_pam_account(int, Buffer *);
164 int mm_answer_pam_init_ctx(int, Buffer *);
165 int mm_answer_pam_query(int, Buffer *);
166 int mm_answer_pam_respond(int, Buffer *);
167 int mm_answer_pam_free_ctx(int, Buffer *);
171 int mm_answer_gss_setup_ctx(int, Buffer *);
172 int mm_answer_gss_accept_ctx(int, Buffer *);
173 int mm_answer_gss_userok(int, Buffer *);
174 int mm_answer_gss_checkmic(int, Buffer *);
175 int mm_answer_gss_sign(int, Buffer *);
176 int mm_answer_gss_updatecreds(int, Buffer *);
179 #ifdef SSH_AUDIT_EVENTS
180 int mm_answer_audit_event(int, Buffer *);
181 int mm_answer_audit_command(int, Buffer *);
184 static Authctxt *authctxt;
185 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
187 /* local state for key verify */
188 static u_char *key_blob = NULL;
189 static u_int key_bloblen = 0;
190 static int key_blobtype = MM_NOKEY;
191 static char *hostbased_cuser = NULL;
192 static char *hostbased_chost = NULL;
193 static char *auth_method = "unknown";
194 static u_int session_id2_len = 0;
195 static u_char *session_id2 = NULL;
196 static pid_t monitor_child_pid;
199 enum monitor_reqtype type;
201 int (*f)(int, Buffer *);
204 #define MON_ISAUTH 0x0004 /* Required for Authentication */
205 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
206 #define MON_ONCE 0x0010 /* Disable after calling */
207 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
209 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
211 #define MON_PERMIT 0x1000 /* Request is permitted */
213 struct mon_table mon_dispatch_proto20[] = {
214 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
215 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
216 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
217 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
218 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
219 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
221 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
222 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
223 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
224 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
225 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
226 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
228 #ifdef SSH_AUDIT_EVENTS
229 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
232 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
233 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
236 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
237 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
239 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
240 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
242 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
243 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
244 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
245 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
246 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
249 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata},
250 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1},
251 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2},
252 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm},
253 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm},
258 struct mon_table mon_dispatch_postauth20[] = {
260 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
261 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
262 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
263 {MONITOR_REQ_GSSUPCREDS, 0, mm_answer_gss_updatecreds},
265 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
266 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
267 {MONITOR_REQ_PTY, 0, mm_answer_pty},
268 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
269 {MONITOR_REQ_TERM, 0, mm_answer_term},
270 #ifdef SSH_AUDIT_EVENTS
271 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
272 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
277 struct mon_table mon_dispatch_proto15[] = {
278 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
279 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
280 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
281 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
282 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
283 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
284 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
285 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
287 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
288 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
291 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
292 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
295 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
296 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
297 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
298 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
299 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
300 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
302 #ifdef SSH_AUDIT_EVENTS
303 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
308 struct mon_table mon_dispatch_postauth15[] = {
309 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
310 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
311 {MONITOR_REQ_TERM, 0, mm_answer_term},
312 #ifdef SSH_AUDIT_EVENTS
313 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
314 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
319 struct mon_table *mon_dispatch;
321 /* Specifies if a certain message is allowed at the moment */
324 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
326 while (ent->f != NULL) {
327 if (ent->type == type) {
328 ent->flags &= ~MON_PERMIT;
329 ent->flags |= permit ? MON_PERMIT : 0;
337 monitor_permit_authentications(int permit)
339 struct mon_table *ent = mon_dispatch;
341 while (ent->f != NULL) {
342 if (ent->flags & MON_AUTH) {
343 ent->flags &= ~MON_PERMIT;
344 ent->flags |= permit ? MON_PERMIT : 0;
351 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
353 struct mon_table *ent;
354 int authenticated = 0;
356 debug3("preauth child monitor started");
358 authctxt = _authctxt;
359 memset(authctxt, 0, sizeof(*authctxt));
361 authctxt->loginmsg = &loginmsg;
364 mon_dispatch = mon_dispatch_proto20;
366 /* Permit requests for moduli and signatures */
367 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
368 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
370 /* and for the GSSAPI key exchange */
371 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
374 mon_dispatch = mon_dispatch_proto15;
376 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
379 /* The first few requests do not require asynchronous access */
380 while (!authenticated) {
381 auth_method = "unknown";
382 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
384 if (!(ent->flags & MON_AUTHDECIDE))
385 fatal("%s: unexpected authentication from %d",
386 __func__, ent->type);
387 if (authctxt->pw->pw_uid == 0 &&
388 !auth_root_allowed(auth_method))
391 /* PAM needs to perform account checks after auth */
392 if (options.use_pam && authenticated) {
396 mm_request_receive_expect(pmonitor->m_sendfd,
397 MONITOR_REQ_PAM_ACCOUNT, &m);
398 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
404 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
405 auth_log(authctxt, authenticated, auth_method,
406 compat20 ? " ssh2" : "");
408 authctxt->failures++;
411 /* Cleanup JPAKE context after authentication */
412 if (ent->flags & MON_AUTHDECIDE) {
413 if (authctxt->jpake_ctx != NULL) {
414 jpake_free(authctxt->jpake_ctx);
415 authctxt->jpake_ctx = NULL;
421 if (!authctxt->valid)
422 fatal("%s: authenticated invalid user", __func__);
423 if (strcmp(auth_method, "unknown") == 0)
424 fatal("%s: authentication method name unknown", __func__);
426 debug("%s: %s has been authenticated by privileged process",
427 __func__, authctxt->user);
429 mm_get_keystate(pmonitor);
433 monitor_set_child_handler(pid_t pid)
435 monitor_child_pid = pid;
439 monitor_child_handler(int sig)
441 kill(monitor_child_pid, sig);
445 monitor_child_postauth(struct monitor *pmonitor)
447 monitor_set_child_handler(pmonitor->m_pid);
448 signal(SIGHUP, &monitor_child_handler);
449 signal(SIGTERM, &monitor_child_handler);
450 signal(SIGINT, &monitor_child_handler);
453 mon_dispatch = mon_dispatch_postauth20;
455 /* Permit requests for moduli and signatures */
456 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
457 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
458 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
460 /* and for the GSSAPI key exchange */
461 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
464 mon_dispatch = mon_dispatch_postauth15;
465 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
468 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
469 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
473 monitor_read(pmonitor, mon_dispatch, NULL);
477 monitor_sync(struct monitor *pmonitor)
479 if (options.compression) {
480 /* The member allocation is not visible, so sync it */
481 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
486 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
487 struct mon_table **pent)
495 mm_request_receive(pmonitor->m_sendfd, &m);
496 type = buffer_get_char(&m);
498 debug3("%s: checking request %d", __func__, type);
500 while (ent->f != NULL) {
501 if (ent->type == type)
506 if (ent->f != NULL) {
507 if (!(ent->flags & MON_PERMIT))
508 fatal("%s: unpermitted request %d", __func__,
510 ret = (*ent->f)(pmonitor->m_sendfd, &m);
513 /* The child may use this request only once, disable it */
514 if (ent->flags & MON_ONCE) {
515 debug2("%s: %d used once, disabling now", __func__,
517 ent->flags &= ~MON_PERMIT;
526 fatal("%s: unsupported request: %d", __func__, type);
532 /* allowed key state */
534 monitor_allowed_key(u_char *blob, u_int bloblen)
536 /* make sure key is allowed */
537 if (key_blob == NULL || key_bloblen != bloblen ||
538 timingsafe_bcmp(key_blob, blob, key_bloblen))
544 monitor_reset_key_state(void)
547 if (key_blob != NULL)
549 if (hostbased_cuser != NULL)
550 xfree(hostbased_cuser);
551 if (hostbased_chost != NULL)
552 xfree(hostbased_chost);
555 key_blobtype = MM_NOKEY;
556 hostbased_cuser = NULL;
557 hostbased_chost = NULL;
561 mm_answer_moduli(int sock, Buffer *m)
566 min = buffer_get_int(m);
567 want = buffer_get_int(m);
568 max = buffer_get_int(m);
570 debug3("%s: got parameters: %d %d %d",
571 __func__, min, want, max);
572 /* We need to check here, too, in case the child got corrupted */
573 if (max < min || want < min || max < want)
574 fatal("%s: bad parameters: %d %d %d",
575 __func__, min, want, max);
579 dh = choose_dh(min, want, max);
581 buffer_put_char(m, 0);
584 /* Send first bignum */
585 buffer_put_char(m, 1);
586 buffer_put_bignum2(m, dh->p);
587 buffer_put_bignum2(m, dh->g);
591 mm_request_send(sock, MONITOR_ANS_MODULI, m);
596 mm_answer_sign(int sock, Buffer *m)
601 u_int siglen, datlen;
604 debug3("%s", __func__);
606 keyid = buffer_get_int(m);
607 p = buffer_get_string(m, &datlen);
610 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
611 * SHA384 (48 bytes) and SHA512 (64 bytes).
613 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64)
614 fatal("%s: data length incorrect: %u", __func__, datlen);
616 /* save session id, it will be passed on the first call */
617 if (session_id2_len == 0) {
618 session_id2_len = datlen;
619 session_id2 = xmalloc(session_id2_len);
620 memcpy(session_id2, p, session_id2_len);
623 if ((key = get_hostkey_by_index(keyid)) == NULL)
624 fatal("%s: no hostkey from index %d", __func__, keyid);
625 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
626 fatal("%s: key_sign failed", __func__);
628 debug3("%s: signature %p(%u)", __func__, signature, siglen);
631 buffer_put_string(m, signature, siglen);
636 mm_request_send(sock, MONITOR_ANS_SIGN, m);
638 /* Turn on permissions for getpwnam */
639 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
644 /* Retrieves the password entry and also checks if the user is permitted */
647 mm_answer_pwnamallow(int sock, Buffer *m)
650 struct passwd *pwent;
653 debug3("%s", __func__);
655 if (authctxt->attempt++ != 0)
656 fatal("%s: multiple attempts for getpwnam", __func__);
658 username = buffer_get_string(m, NULL);
660 pwent = getpwnamallow(username);
662 authctxt->user = xstrdup(username);
663 setproctitle("%s [priv]", pwent ? username : "unknown");
669 buffer_put_char(m, 0);
670 authctxt->pw = fakepw();
675 authctxt->pw = pwent;
678 buffer_put_char(m, 1);
679 buffer_put_string(m, pwent, sizeof(struct passwd));
680 buffer_put_cstring(m, pwent->pw_name);
681 buffer_put_cstring(m, "*");
682 buffer_put_cstring(m, pwent->pw_gecos);
683 #ifdef HAVE_PW_CLASS_IN_PASSWD
684 buffer_put_cstring(m, pwent->pw_class);
686 buffer_put_cstring(m, pwent->pw_dir);
687 buffer_put_cstring(m, pwent->pw_shell);
690 buffer_put_string(m, &options, sizeof(options));
691 if (options.banner != NULL)
692 buffer_put_cstring(m, options.banner);
693 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
694 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
696 /* For SSHv1 allow authentication now */
698 monitor_permit_authentications(1);
700 /* Allow service/style information on the auth context */
701 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
702 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
707 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
713 int mm_answer_auth2_read_banner(int sock, Buffer *m)
718 banner = auth2_read_banner();
719 buffer_put_cstring(m, banner != NULL ? banner : "");
720 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
729 mm_answer_authserv(int sock, Buffer *m)
731 monitor_permit_authentications(1);
733 authctxt->service = buffer_get_string(m, NULL);
734 authctxt->style = buffer_get_string(m, NULL);
735 debug3("%s: service=%s, style=%s",
736 __func__, authctxt->service, authctxt->style);
738 if (strlen(authctxt->style) == 0) {
739 xfree(authctxt->style);
740 authctxt->style = NULL;
747 mm_answer_authpassword(int sock, Buffer *m)
749 static int call_count;
754 passwd = buffer_get_string(m, &plen);
755 /* Only authenticate if the context is valid */
756 authenticated = options.password_authentication &&
757 auth_password(authctxt, passwd);
758 memset(passwd, 0, strlen(passwd));
762 buffer_put_int(m, authenticated);
764 debug3("%s: sending result %d", __func__, authenticated);
765 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
768 if (plen == 0 && call_count == 1)
769 auth_method = "none";
771 auth_method = "password";
773 /* Causes monitor loop to terminate if authenticated */
774 return (authenticated);
779 mm_answer_bsdauthquery(int sock, Buffer *m)
781 char *name, *infotxt;
787 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
788 &prompts, &echo_on) < 0 ? 0 : 1;
791 buffer_put_int(m, success);
793 buffer_put_cstring(m, prompts[0]);
795 debug3("%s: sending challenge success: %u", __func__, success);
796 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
809 mm_answer_bsdauthrespond(int sock, Buffer *m)
814 if (authctxt->as == 0)
815 fatal("%s: no bsd auth session", __func__);
817 response = buffer_get_string(m, NULL);
818 authok = options.challenge_response_authentication &&
819 auth_userresponse(authctxt->as, response, 0);
821 debug3("%s: <%s> = <%d>", __func__, response, authok);
825 buffer_put_int(m, authok);
827 debug3("%s: sending authenticated: %d", __func__, authok);
828 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
830 auth_method = "bsdauth";
832 return (authok != 0);
838 mm_answer_skeyquery(int sock, Buffer *m)
841 char challenge[1024];
844 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
845 sizeof(challenge)) < 0 ? 0 : 1;
848 buffer_put_int(m, success);
850 buffer_put_cstring(m, challenge);
852 debug3("%s: sending challenge success: %u", __func__, success);
853 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
859 mm_answer_skeyrespond(int sock, Buffer *m)
864 response = buffer_get_string(m, NULL);
866 authok = (options.challenge_response_authentication &&
868 skey_haskey(authctxt->pw->pw_name) == 0 &&
869 skey_passcheck(authctxt->pw->pw_name, response) != -1);
874 buffer_put_int(m, authok);
876 debug3("%s: sending authenticated: %d", __func__, authok);
877 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
879 auth_method = "skey";
881 return (authok != 0);
887 mm_answer_pam_start(int sock, Buffer *m)
889 if (!options.use_pam)
890 fatal("UsePAM not set, but ended up in %s anyway", __func__);
894 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
900 mm_answer_pam_account(int sock, Buffer *m)
904 if (!options.use_pam)
905 fatal("UsePAM not set, but ended up in %s anyway", __func__);
907 ret = do_pam_account();
909 buffer_put_int(m, ret);
910 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
912 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
917 static void *sshpam_ctxt, *sshpam_authok;
918 extern KbdintDevice sshpam_device;
921 mm_answer_pam_init_ctx(int sock, Buffer *m)
924 debug3("%s", __func__);
925 authctxt->user = buffer_get_string(m, NULL);
926 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
927 sshpam_authok = NULL;
929 if (sshpam_ctxt != NULL) {
930 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
931 buffer_put_int(m, 1);
933 buffer_put_int(m, 0);
935 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
940 mm_answer_pam_query(int sock, Buffer *m)
942 char *name = NULL, *info = NULL, **prompts = NULL;
943 u_int i, num = 0, *echo_on = 0;
946 debug3("%s", __func__);
947 sshpam_authok = NULL;
948 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
949 if (ret == 0 && num == 0)
950 sshpam_authok = sshpam_ctxt;
951 if (num > 1 || name == NULL || info == NULL)
954 buffer_put_int(m, ret);
955 buffer_put_cstring(m, name);
957 buffer_put_cstring(m, info);
959 buffer_put_int(m, num);
960 for (i = 0; i < num; ++i) {
961 buffer_put_cstring(m, prompts[i]);
963 buffer_put_int(m, echo_on[i]);
969 auth_method = "keyboard-interactive/pam";
970 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
975 mm_answer_pam_respond(int sock, Buffer *m)
981 debug3("%s", __func__);
982 sshpam_authok = NULL;
983 num = buffer_get_int(m);
985 resp = xcalloc(num, sizeof(char *));
986 for (i = 0; i < num; ++i)
987 resp[i] = buffer_get_string(m, NULL);
988 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
989 for (i = 0; i < num; ++i)
993 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
996 buffer_put_int(m, ret);
997 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
998 auth_method = "keyboard-interactive/pam";
1000 sshpam_authok = sshpam_ctxt;
1005 mm_answer_pam_free_ctx(int sock, Buffer *m)
1008 debug3("%s", __func__);
1009 (sshpam_device.free_ctx)(sshpam_ctxt);
1011 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
1012 auth_method = "keyboard-interactive/pam";
1013 return (sshpam_authok == sshpam_ctxt);
1018 mm_answer_keyallowed(int sock, Buffer *m)
1021 char *cuser, *chost;
1024 enum mm_keytype type = 0;
1027 debug3("%s entering", __func__);
1029 type = buffer_get_int(m);
1030 cuser = buffer_get_string(m, NULL);
1031 chost = buffer_get_string(m, NULL);
1032 blob = buffer_get_string(m, &bloblen);
1034 key = key_from_blob(blob, bloblen);
1036 if ((compat20 && type == MM_RSAHOSTKEY) ||
1037 (!compat20 && type != MM_RSAHOSTKEY))
1038 fatal("%s: key type and protocol mismatch", __func__);
1040 debug3("%s: key_from_blob: %p", __func__, key);
1042 if (key != NULL && authctxt->valid) {
1045 allowed = options.pubkey_authentication &&
1046 user_key_allowed(authctxt->pw, key);
1047 auth_method = "publickey";
1048 if (options.pubkey_authentication && allowed != 1)
1049 auth_clear_options();
1052 allowed = options.hostbased_authentication &&
1053 hostbased_key_allowed(authctxt->pw,
1055 auth_method = "hostbased";
1058 key->type = KEY_RSA1; /* XXX */
1059 allowed = options.rhosts_rsa_authentication &&
1060 auth_rhosts_rsa_key_allowed(authctxt->pw,
1062 if (options.rhosts_rsa_authentication && allowed != 1)
1063 auth_clear_options();
1064 auth_method = "rsa";
1067 fatal("%s: unknown key type %d", __func__, type);
1074 /* clear temporarily storage (used by verify) */
1075 monitor_reset_key_state();
1078 /* Save temporarily for comparison in verify */
1080 key_bloblen = bloblen;
1081 key_blobtype = type;
1082 hostbased_cuser = cuser;
1083 hostbased_chost = chost;
1085 /* Log failed attempt */
1086 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
1092 debug3("%s: key %p is %s",
1093 __func__, key, allowed ? "allowed" : "not allowed");
1096 buffer_put_int(m, allowed);
1097 buffer_put_int(m, forced_command != NULL);
1099 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1101 if (type == MM_RSAHOSTKEY)
1102 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1108 monitor_valid_userblob(u_char *data, u_int datalen)
1116 buffer_append(&b, data, datalen);
1118 if (datafellows & SSH_OLD_SESSIONID) {
1120 len = buffer_len(&b);
1121 if ((session_id2 == NULL) ||
1122 (len < session_id2_len) ||
1123 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1125 buffer_consume(&b, session_id2_len);
1127 p = buffer_get_string(&b, &len);
1128 if ((session_id2 == NULL) ||
1129 (len != session_id2_len) ||
1130 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1134 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1136 p = buffer_get_string(&b, NULL);
1137 if (strcmp(authctxt->user, p) != 0) {
1138 logit("wrong user name passed to monitor: expected %s != %.100s",
1143 buffer_skip_string(&b);
1144 if (datafellows & SSH_BUG_PKAUTH) {
1145 if (!buffer_get_char(&b))
1148 p = buffer_get_string(&b, NULL);
1149 if (strcmp("publickey", p) != 0)
1152 if (!buffer_get_char(&b))
1154 buffer_skip_string(&b);
1156 buffer_skip_string(&b);
1157 if (buffer_len(&b) != 0)
1164 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1173 buffer_append(&b, data, datalen);
1175 p = buffer_get_string(&b, &len);
1176 if ((session_id2 == NULL) ||
1177 (len != session_id2_len) ||
1178 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1182 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1184 p = buffer_get_string(&b, NULL);
1185 if (strcmp(authctxt->user, p) != 0) {
1186 logit("wrong user name passed to monitor: expected %s != %.100s",
1191 buffer_skip_string(&b); /* service */
1192 p = buffer_get_string(&b, NULL);
1193 if (strcmp(p, "hostbased") != 0)
1196 buffer_skip_string(&b); /* pkalg */
1197 buffer_skip_string(&b); /* pkblob */
1199 /* verify client host, strip trailing dot if necessary */
1200 p = buffer_get_string(&b, NULL);
1201 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1203 if (strcmp(p, chost) != 0)
1207 /* verify client user */
1208 p = buffer_get_string(&b, NULL);
1209 if (strcmp(p, cuser) != 0)
1213 if (buffer_len(&b) != 0)
1220 mm_answer_keyverify(int sock, Buffer *m)
1223 u_char *signature, *data, *blob;
1224 u_int signaturelen, datalen, bloblen;
1228 blob = buffer_get_string(m, &bloblen);
1229 signature = buffer_get_string(m, &signaturelen);
1230 data = buffer_get_string(m, &datalen);
1232 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1233 !monitor_allowed_key(blob, bloblen))
1234 fatal("%s: bad key, not previously allowed", __func__);
1236 key = key_from_blob(blob, bloblen);
1238 fatal("%s: bad public key blob", __func__);
1240 switch (key_blobtype) {
1242 valid_data = monitor_valid_userblob(data, datalen);
1245 valid_data = monitor_valid_hostbasedblob(data, datalen,
1246 hostbased_cuser, hostbased_chost);
1253 fatal("%s: bad signature data blob", __func__);
1255 verified = key_verify(key, signature, signaturelen, data, datalen);
1256 debug3("%s: key %p signature %s",
1257 __func__, key, (verified == 1) ? "verified" : "unverified");
1264 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1266 monitor_reset_key_state();
1269 buffer_put_int(m, verified);
1270 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1272 return (verified == 1);
1276 mm_record_login(Session *s, struct passwd *pw)
1279 struct sockaddr_storage from;
1282 * Get IP address of client. If the connection is not a socket, let
1283 * the address be 0.0.0.0.
1285 memset(&from, 0, sizeof(from));
1286 fromlen = sizeof(from);
1287 if (packet_connection_is_on_socket()) {
1288 if (getpeername(packet_get_connection_in(),
1289 (struct sockaddr *)&from, &fromlen) < 0) {
1290 debug("getpeername: %.100s", strerror(errno));
1294 /* Record that there was a login on that tty from the remote host. */
1295 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1296 get_remote_name_or_ip(utmp_len, options.use_dns),
1297 (struct sockaddr *)&from, fromlen);
1301 mm_session_close(Session *s)
1303 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1304 if (s->ttyfd != -1) {
1305 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1306 session_pty_cleanup2(s);
1308 session_unused(s->self);
1312 mm_answer_pty(int sock, Buffer *m)
1314 extern struct monitor *pmonitor;
1318 debug3("%s entering", __func__);
1324 s->authctxt = authctxt;
1325 s->pw = authctxt->pw;
1326 s->pid = pmonitor->m_pid;
1327 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1330 pty_setowner(authctxt->pw, s->tty);
1332 buffer_put_int(m, 1);
1333 buffer_put_cstring(m, s->tty);
1335 /* We need to trick ttyslot */
1336 if (dup2(s->ttyfd, 0) == -1)
1337 fatal("%s: dup2", __func__);
1339 mm_record_login(s, authctxt->pw);
1341 /* Now we can close the file descriptor again */
1344 /* send messages generated by record_login */
1345 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1346 buffer_clear(&loginmsg);
1348 mm_request_send(sock, MONITOR_ANS_PTY, m);
1350 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1351 mm_send_fd(sock, s->ttyfd) == -1)
1352 fatal("%s: send fds failed", __func__);
1354 /* make sure nothing uses fd 0 */
1355 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1356 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1358 error("%s: fd0 %d != 0", __func__, fd0);
1360 /* slave is not needed */
1362 s->ttyfd = s->ptyfd;
1363 /* no need to dup() because nobody closes ptyfd */
1364 s->ptymaster = s->ptyfd;
1366 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1372 mm_session_close(s);
1373 buffer_put_int(m, 0);
1374 mm_request_send(sock, MONITOR_ANS_PTY, m);
1379 mm_answer_pty_cleanup(int sock, Buffer *m)
1384 debug3("%s entering", __func__);
1386 tty = buffer_get_string(m, NULL);
1387 if ((s = session_by_tty(tty)) != NULL)
1388 mm_session_close(s);
1395 mm_answer_sesskey(int sock, Buffer *m)
1400 /* Turn off permissions */
1401 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1403 if ((p = BN_new()) == NULL)
1404 fatal("%s: BN_new", __func__);
1406 buffer_get_bignum2(m, p);
1408 rsafail = ssh1_session_key(p);
1411 buffer_put_int(m, rsafail);
1412 buffer_put_bignum2(m, p);
1416 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1418 /* Turn on permissions for sessid passing */
1419 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1425 mm_answer_sessid(int sock, Buffer *m)
1429 debug3("%s entering", __func__);
1431 if (buffer_len(m) != 16)
1432 fatal("%s: bad ssh1 session id", __func__);
1433 for (i = 0; i < 16; i++)
1434 session_id[i] = buffer_get_char(m);
1436 /* Turn on permissions for getpwnam */
1437 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1443 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1447 u_char *blob = NULL;
1451 debug3("%s entering", __func__);
1453 auth_method = "rsa";
1454 if (options.rsa_authentication && authctxt->valid) {
1455 if ((client_n = BN_new()) == NULL)
1456 fatal("%s: BN_new", __func__);
1457 buffer_get_bignum2(m, client_n);
1458 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1459 BN_clear_free(client_n);
1462 buffer_put_int(m, allowed);
1463 buffer_put_int(m, forced_command != NULL);
1465 /* clear temporarily storage (used by generate challenge) */
1466 monitor_reset_key_state();
1468 if (allowed && key != NULL) {
1469 key->type = KEY_RSA; /* cheat for key_to_blob */
1470 if (key_to_blob(key, &blob, &blen) == 0)
1471 fatal("%s: key_to_blob failed", __func__);
1472 buffer_put_string(m, blob, blen);
1474 /* Save temporarily for comparison in verify */
1477 key_blobtype = MM_RSAUSERKEY;
1482 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1484 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1485 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1490 mm_answer_rsa_challenge(int sock, Buffer *m)
1496 debug3("%s entering", __func__);
1498 if (!authctxt->valid)
1499 fatal("%s: authctxt not valid", __func__);
1500 blob = buffer_get_string(m, &blen);
1501 if (!monitor_allowed_key(blob, blen))
1502 fatal("%s: bad key, not previously allowed", __func__);
1503 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1504 fatal("%s: key type mismatch", __func__);
1505 if ((key = key_from_blob(blob, blen)) == NULL)
1506 fatal("%s: received bad key", __func__);
1507 if (key->type != KEY_RSA)
1508 fatal("%s: received bad key type %d", __func__, key->type);
1509 key->type = KEY_RSA1;
1511 BN_clear_free(ssh1_challenge);
1512 ssh1_challenge = auth_rsa_generate_challenge(key);
1515 buffer_put_bignum2(m, ssh1_challenge);
1517 debug3("%s sending reply", __func__);
1518 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1520 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1528 mm_answer_rsa_response(int sock, Buffer *m)
1531 u_char *blob, *response;
1535 debug3("%s entering", __func__);
1537 if (!authctxt->valid)
1538 fatal("%s: authctxt not valid", __func__);
1539 if (ssh1_challenge == NULL)
1540 fatal("%s: no ssh1_challenge", __func__);
1542 blob = buffer_get_string(m, &blen);
1543 if (!monitor_allowed_key(blob, blen))
1544 fatal("%s: bad key, not previously allowed", __func__);
1545 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1546 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1547 if ((key = key_from_blob(blob, blen)) == NULL)
1548 fatal("%s: received bad key", __func__);
1549 response = buffer_get_string(m, &len);
1551 fatal("%s: received bad response to challenge", __func__);
1552 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1558 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1561 BN_clear_free(ssh1_challenge);
1562 ssh1_challenge = NULL;
1563 monitor_reset_key_state();
1566 buffer_put_int(m, success);
1567 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1573 mm_answer_term(int sock, Buffer *req)
1575 extern struct monitor *pmonitor;
1578 debug3("%s: tearing down sessions", __func__);
1580 /* The child is terminating */
1581 session_destroy_all(&mm_session_close);
1584 if (options.use_pam)
1588 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1592 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1594 /* Terminate process */
1598 #ifdef SSH_AUDIT_EVENTS
1599 /* Report that an audit event occurred */
1601 mm_answer_audit_event(int socket, Buffer *m)
1603 ssh_audit_event_t event;
1605 debug3("%s entering", __func__);
1607 event = buffer_get_int(m);
1609 case SSH_AUTH_FAIL_PUBKEY:
1610 case SSH_AUTH_FAIL_HOSTBASED:
1611 case SSH_AUTH_FAIL_GSSAPI:
1612 case SSH_LOGIN_EXCEED_MAXTRIES:
1613 case SSH_LOGIN_ROOT_DENIED:
1614 case SSH_CONNECTION_CLOSE:
1615 case SSH_INVALID_USER:
1619 fatal("Audit event type %d not permitted", event);
1626 mm_answer_audit_command(int socket, Buffer *m)
1631 debug3("%s entering", __func__);
1632 cmd = buffer_get_string(m, &len);
1633 /* sanity check command, if so how? */
1634 audit_run_command(cmd);
1638 #endif /* SSH_AUDIT_EVENTS */
1641 monitor_apply_keystate(struct monitor *pmonitor)
1644 set_newkeys(MODE_IN);
1645 set_newkeys(MODE_OUT);
1647 packet_set_protocol_flags(child_state.ssh1protoflags);
1648 packet_set_encryption_key(child_state.ssh1key,
1649 child_state.ssh1keylen, child_state.ssh1cipher);
1650 xfree(child_state.ssh1key);
1653 /* for rc4 and other stateful ciphers */
1654 packet_set_keycontext(MODE_OUT, child_state.keyout);
1655 xfree(child_state.keyout);
1656 packet_set_keycontext(MODE_IN, child_state.keyin);
1657 xfree(child_state.keyin);
1660 packet_set_iv(MODE_OUT, child_state.ivout);
1661 xfree(child_state.ivout);
1662 packet_set_iv(MODE_IN, child_state.ivin);
1663 xfree(child_state.ivin);
1666 memcpy(&incoming_stream, &child_state.incoming,
1667 sizeof(incoming_stream));
1668 memcpy(&outgoing_stream, &child_state.outgoing,
1669 sizeof(outgoing_stream));
1671 /* Update with new address */
1672 if (options.compression)
1673 mm_init_compression(pmonitor->m_zlib);
1675 /* Network I/O buffers */
1676 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1677 buffer_clear(packet_get_input());
1678 buffer_append(packet_get_input(), child_state.input, child_state.ilen);
1679 memset(child_state.input, 0, child_state.ilen);
1680 xfree(child_state.input);
1682 buffer_clear(packet_get_output());
1683 buffer_append(packet_get_output(), child_state.output,
1685 memset(child_state.output, 0, child_state.olen);
1686 xfree(child_state.output);
1690 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
1694 mm_get_kex(Buffer *m)
1700 kex = xcalloc(1, sizeof(*kex));
1701 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1702 if (session_id2 == NULL ||
1703 kex->session_id_len != session_id2_len ||
1704 timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0)
1705 fatal("mm_get_get: internal error: bad session id");
1706 kex->we_need = buffer_get_int(m);
1707 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1708 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1709 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1710 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1711 kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1713 if (options.gss_keyex) {
1714 kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
1715 kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server;
1716 kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server;
1720 kex->hostkey_type = buffer_get_int(m);
1721 kex->kex_type = buffer_get_int(m);
1722 blob = buffer_get_string(m, &bloblen);
1723 buffer_init(&kex->my);
1724 buffer_append(&kex->my, blob, bloblen);
1726 blob = buffer_get_string(m, &bloblen);
1727 buffer_init(&kex->peer);
1728 buffer_append(&kex->peer, blob, bloblen);
1731 kex->flags = buffer_get_int(m);
1732 kex->client_version_string = buffer_get_string(m, NULL);
1733 kex->server_version_string = buffer_get_string(m, NULL);
1734 kex->load_host_public_key=&get_hostkey_public_by_type;
1735 kex->load_host_private_key=&get_hostkey_private_by_type;
1736 kex->host_key_index=&get_hostkey_index;
1741 /* This function requries careful sanity checking */
1744 mm_get_keystate(struct monitor *pmonitor)
1748 u_int bloblen, plen;
1749 u_int32_t seqnr, packets;
1750 u_int64_t blocks, bytes;
1752 debug3("%s: Waiting for new keys", __func__);
1755 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1757 child_state.ssh1protoflags = buffer_get_int(&m);
1758 child_state.ssh1cipher = buffer_get_int(&m);
1759 child_state.ssh1key = buffer_get_string(&m,
1760 &child_state.ssh1keylen);
1761 child_state.ivout = buffer_get_string(&m,
1762 &child_state.ivoutlen);
1763 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1766 /* Get the Kex for rekeying */
1767 *pmonitor->m_pkex = mm_get_kex(&m);
1770 blob = buffer_get_string(&m, &bloblen);
1771 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1774 debug3("%s: Waiting for second key", __func__);
1775 blob = buffer_get_string(&m, &bloblen);
1776 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1779 /* Now get sequence numbers for the packets */
1780 seqnr = buffer_get_int(&m);
1781 blocks = buffer_get_int64(&m);
1782 packets = buffer_get_int(&m);
1783 bytes = buffer_get_int64(&m);
1784 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1785 seqnr = buffer_get_int(&m);
1786 blocks = buffer_get_int64(&m);
1787 packets = buffer_get_int(&m);
1788 bytes = buffer_get_int64(&m);
1789 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1792 /* Get the key context */
1793 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1794 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1796 debug3("%s: Getting compression state", __func__);
1797 /* Get compression state */
1798 p = buffer_get_string(&m, &plen);
1799 if (plen != sizeof(child_state.outgoing))
1800 fatal("%s: bad request size", __func__);
1801 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1804 p = buffer_get_string(&m, &plen);
1805 if (plen != sizeof(child_state.incoming))
1806 fatal("%s: bad request size", __func__);
1807 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1810 /* Network I/O buffers */
1811 debug3("%s: Getting Network I/O buffers", __func__);
1812 child_state.input = buffer_get_string(&m, &child_state.ilen);
1813 child_state.output = buffer_get_string(&m, &child_state.olen);
1817 child_state.sent_bytes = buffer_get_int64(&m);
1818 child_state.recv_bytes = buffer_get_int64(&m);
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;