1 /* $OpenBSD: monitor.c,v 1.104 2009/06/12 20:43:22 andreas 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_error(int, Buffer *);
177 int mm_answer_gss_indicate_mechs(int, Buffer *);
178 int mm_answer_gss_localname(int, Buffer *);
179 int mm_answer_gss_updatecreds(int, Buffer *);
182 #ifdef SSH_AUDIT_EVENTS
183 int mm_answer_audit_event(int, Buffer *);
184 int mm_answer_audit_command(int, Buffer *);
187 static Authctxt *authctxt;
188 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
190 /* local state for key verify */
191 static u_char *key_blob = NULL;
192 static u_int key_bloblen = 0;
193 static int key_blobtype = MM_NOKEY;
194 static char *hostbased_cuser = NULL;
195 static char *hostbased_chost = NULL;
196 static char *auth_method = "unknown";
197 static u_int session_id2_len = 0;
198 static u_char *session_id2 = NULL;
199 static pid_t monitor_child_pid;
202 enum monitor_reqtype type;
204 int (*f)(int, Buffer *);
207 #define MON_ISAUTH 0x0004 /* Required for Authentication */
208 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
209 #define MON_ONCE 0x0010 /* Disable after calling */
210 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
212 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
214 #define MON_PERMIT 0x1000 /* Request is permitted */
216 struct mon_table mon_dispatch_proto20[] = {
217 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
218 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
219 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
220 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
221 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
222 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
224 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
225 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
226 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
227 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
228 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
229 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
231 #ifdef SSH_AUDIT_EVENTS
232 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
235 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
236 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
239 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
240 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
242 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
243 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
245 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
246 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
247 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
248 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
249 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
250 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
251 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
252 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
255 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata},
256 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1},
257 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2},
258 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm},
259 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm},
264 struct mon_table mon_dispatch_postauth20[] = {
266 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
267 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
268 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
269 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
270 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
271 {MONITOR_REQ_GSSUPCREDS, 0, mm_answer_gss_updatecreds},
273 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
274 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
275 {MONITOR_REQ_PTY, 0, mm_answer_pty},
276 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
277 {MONITOR_REQ_TERM, 0, mm_answer_term},
278 #ifdef SSH_AUDIT_EVENTS
279 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
280 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
285 struct mon_table mon_dispatch_proto15[] = {
286 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
287 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
288 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
289 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
290 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
291 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
292 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
293 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
295 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
296 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
299 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
300 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
303 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
304 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
305 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
306 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
307 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
310 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
311 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
312 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
313 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
314 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
315 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
317 #ifdef SSH_AUDIT_EVENTS
318 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
323 struct mon_table mon_dispatch_postauth15[] = {
324 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
325 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
326 {MONITOR_REQ_TERM, 0, mm_answer_term},
327 #ifdef SSH_AUDIT_EVENTS
328 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
329 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
334 struct mon_table *mon_dispatch;
336 /* Specifies if a certain message is allowed at the moment */
339 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
341 while (ent->f != NULL) {
342 if (ent->type == type) {
343 ent->flags &= ~MON_PERMIT;
344 ent->flags |= permit ? MON_PERMIT : 0;
352 monitor_permit_authentications(int permit)
354 struct mon_table *ent = mon_dispatch;
356 while (ent->f != NULL) {
357 if (ent->flags & MON_AUTH) {
358 ent->flags &= ~MON_PERMIT;
359 ent->flags |= permit ? MON_PERMIT : 0;
366 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
368 struct mon_table *ent;
369 int authenticated = 0;
371 debug3("preauth child monitor started");
373 authctxt = _authctxt;
374 memset(authctxt, 0, sizeof(*authctxt));
376 authctxt->loginmsg = &loginmsg;
379 mon_dispatch = mon_dispatch_proto20;
381 /* Permit requests for moduli and signatures */
382 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
383 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
385 /* and for the GSSAPI key exchange */
386 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
387 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
388 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
391 mon_dispatch = mon_dispatch_proto15;
393 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
396 /* The first few requests do not require asynchronous access */
397 while (!authenticated) {
398 auth_method = "unknown";
399 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
401 if (!(ent->flags & MON_AUTHDECIDE))
402 fatal("%s: unexpected authentication from %d",
403 __func__, ent->type);
404 if (authctxt->pw->pw_uid == 0 &&
405 !auth_root_allowed(auth_method))
408 /* PAM needs to perform account checks after auth */
409 if (options.use_pam && authenticated) {
413 mm_request_receive_expect(pmonitor->m_sendfd,
414 MONITOR_REQ_PAM_ACCOUNT, &m);
415 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
421 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
422 auth_log(authctxt, authenticated, auth_method,
423 compat20 ? " ssh2" : "");
425 authctxt->failures++;
428 /* Cleanup JPAKE context after authentication */
429 if (ent->flags & MON_AUTHDECIDE) {
430 if (authctxt->jpake_ctx != NULL) {
431 jpake_free(authctxt->jpake_ctx);
432 authctxt->jpake_ctx = NULL;
438 if (!authctxt->valid)
439 fatal("%s: authenticated invalid user", __func__);
440 if (strcmp(auth_method, "unknown") == 0)
441 fatal("%s: authentication method name unknown", __func__);
443 debug("%s: %s has been authenticated by privileged process",
444 __func__, authctxt->user);
446 mm_get_keystate(pmonitor);
450 monitor_set_child_handler(pid_t pid)
452 monitor_child_pid = pid;
456 monitor_child_handler(int sig)
458 kill(monitor_child_pid, sig);
462 monitor_child_postauth(struct monitor *pmonitor)
464 monitor_set_child_handler(pmonitor->m_pid);
465 signal(SIGHUP, &monitor_child_handler);
466 signal(SIGTERM, &monitor_child_handler);
467 signal(SIGINT, &monitor_child_handler);
470 mon_dispatch = mon_dispatch_postauth20;
472 /* Permit requests for moduli and signatures */
473 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
474 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
475 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
478 /* and for the GSSAPI key exchange */
479 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
480 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
481 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
485 mon_dispatch = mon_dispatch_postauth15;
486 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
489 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
492 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
493 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
497 monitor_read(pmonitor, mon_dispatch, NULL);
501 monitor_sync(struct monitor *pmonitor)
503 if (options.compression) {
504 /* The member allocation is not visible, so sync it */
505 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
510 monitor_read(struct monitor *pmonitor, struct mon_table *ent,
511 struct mon_table **pent)
519 mm_request_receive(pmonitor->m_sendfd, &m);
520 type = buffer_get_char(&m);
522 debug3("%s: checking request %d", __func__, type);
524 while (ent->f != NULL) {
525 if (ent->type == type)
530 if (ent->f != NULL) {
531 if (!(ent->flags & MON_PERMIT))
532 fatal("%s: unpermitted request %d", __func__,
534 ret = (*ent->f)(pmonitor->m_sendfd, &m);
537 /* The child may use this request only once, disable it */
538 if (ent->flags & MON_ONCE) {
539 debug2("%s: %d used once, disabling now", __func__,
541 ent->flags &= ~MON_PERMIT;
550 fatal("%s: unsupported request: %d", __func__, type);
556 /* allowed key state */
558 monitor_allowed_key(u_char *blob, u_int bloblen)
560 /* make sure key is allowed */
561 if (key_blob == NULL || key_bloblen != bloblen ||
562 memcmp(key_blob, blob, key_bloblen))
568 monitor_reset_key_state(void)
571 if (key_blob != NULL)
573 if (hostbased_cuser != NULL)
574 xfree(hostbased_cuser);
575 if (hostbased_chost != NULL)
576 xfree(hostbased_chost);
579 key_blobtype = MM_NOKEY;
580 hostbased_cuser = NULL;
581 hostbased_chost = NULL;
585 mm_answer_moduli(int sock, Buffer *m)
590 min = buffer_get_int(m);
591 want = buffer_get_int(m);
592 max = buffer_get_int(m);
594 debug3("%s: got parameters: %d %d %d",
595 __func__, min, want, max);
596 /* We need to check here, too, in case the child got corrupted */
597 if (max < min || want < min || max < want)
598 fatal("%s: bad parameters: %d %d %d",
599 __func__, min, want, max);
603 dh = choose_dh(min, want, max);
605 buffer_put_char(m, 0);
608 /* Send first bignum */
609 buffer_put_char(m, 1);
610 buffer_put_bignum2(m, dh->p);
611 buffer_put_bignum2(m, dh->g);
615 mm_request_send(sock, MONITOR_ANS_MODULI, m);
620 mm_answer_sign(int sock, Buffer *m)
625 u_int siglen, datlen;
628 debug3("%s", __func__);
630 keyid = buffer_get_int(m);
631 p = buffer_get_string(m, &datlen);
634 * Supported KEX types will only return SHA1 (20 byte) or
635 * SHA256 (32 byte) hashes
637 if (datlen != 20 && datlen != 32)
638 fatal("%s: data length incorrect: %u", __func__, datlen);
640 /* save session id, it will be passed on the first call */
641 if (session_id2_len == 0) {
642 session_id2_len = datlen;
643 session_id2 = xmalloc(session_id2_len);
644 memcpy(session_id2, p, session_id2_len);
647 if ((key = get_hostkey_by_index(keyid)) == NULL)
648 fatal("%s: no hostkey from index %d", __func__, keyid);
649 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
650 fatal("%s: key_sign failed", __func__);
652 debug3("%s: signature %p(%u)", __func__, signature, siglen);
655 buffer_put_string(m, signature, siglen);
660 mm_request_send(sock, MONITOR_ANS_SIGN, m);
662 /* Turn on permissions for getpwnam */
663 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
668 /* Retrieves the password entry and also checks if the user is permitted */
671 mm_answer_pwnamallow(int sock, Buffer *m)
674 struct passwd *pwent;
677 debug3("%s", __func__);
679 username = buffer_get_string(m, NULL);
681 pwent = getpwnamallow(username);
683 if (authctxt->user) xfree(authctxt->user);
684 authctxt->user = xstrdup(username);
686 if (options.permit_pam_user_change)
687 setproctitle("%s [priv]", pwent ? "[pam]" : "unknown");
690 setproctitle("%s [priv]", pwent ? username : "unknown");
696 buffer_put_char(m, 0);
697 authctxt->pw = fakepw();
702 authctxt->pw = pwent;
705 buffer_put_char(m, 1);
706 buffer_put_string(m, pwent, sizeof(struct passwd));
707 buffer_put_cstring(m, pwent->pw_name);
708 buffer_put_cstring(m, "*");
709 buffer_put_cstring(m, pwent->pw_gecos);
710 #ifdef HAVE_PW_CLASS_IN_PASSWD
711 buffer_put_cstring(m, pwent->pw_class);
713 buffer_put_cstring(m, pwent->pw_dir);
714 buffer_put_cstring(m, pwent->pw_shell);
717 buffer_put_string(m, &options, sizeof(options));
718 if (options.banner != NULL)
719 buffer_put_cstring(m, options.banner);
720 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
721 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
723 /* For SSHv1 allow authentication now */
725 monitor_permit_authentications(1);
727 /* Allow service/style information on the auth context */
728 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
729 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
734 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
740 int mm_answer_auth2_read_banner(int sock, Buffer *m)
745 banner = auth2_read_banner();
746 buffer_put_cstring(m, banner != NULL ? banner : "");
747 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
756 mm_answer_authserv(int sock, Buffer *m)
758 monitor_permit_authentications(1);
760 authctxt->service = buffer_get_string(m, NULL);
761 authctxt->style = buffer_get_string(m, NULL);
762 debug3("%s: service=%s, style=%s",
763 __func__, authctxt->service, authctxt->style);
765 if (strlen(authctxt->style) == 0) {
766 xfree(authctxt->style);
767 authctxt->style = NULL;
774 mm_answer_authpassword(int sock, Buffer *m)
776 static int call_count;
781 passwd = buffer_get_string(m, &plen);
782 /* Only authenticate if the context is valid */
783 authenticated = options.password_authentication &&
784 auth_password(authctxt, passwd);
785 memset(passwd, 0, strlen(passwd));
789 buffer_put_int(m, authenticated);
791 debug3("%s: sending result %d", __func__, authenticated);
792 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
795 if (plen == 0 && call_count == 1)
796 auth_method = "none";
798 auth_method = "password";
800 /* Causes monitor loop to terminate if authenticated */
801 return (authenticated);
806 mm_answer_bsdauthquery(int sock, Buffer *m)
808 char *name, *infotxt;
814 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
815 &prompts, &echo_on) < 0 ? 0 : 1;
818 buffer_put_int(m, success);
820 buffer_put_cstring(m, prompts[0]);
822 debug3("%s: sending challenge success: %u", __func__, success);
823 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
836 mm_answer_bsdauthrespond(int sock, Buffer *m)
841 if (authctxt->as == 0)
842 fatal("%s: no bsd auth session", __func__);
844 response = buffer_get_string(m, NULL);
845 authok = options.challenge_response_authentication &&
846 auth_userresponse(authctxt->as, response, 0);
848 debug3("%s: <%s> = <%d>", __func__, response, authok);
852 buffer_put_int(m, authok);
854 debug3("%s: sending authenticated: %d", __func__, authok);
855 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
857 auth_method = "bsdauth";
859 return (authok != 0);
865 mm_answer_skeyquery(int sock, Buffer *m)
868 char challenge[1024];
871 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
872 sizeof(challenge)) < 0 ? 0 : 1;
875 buffer_put_int(m, success);
877 buffer_put_cstring(m, challenge);
879 debug3("%s: sending challenge success: %u", __func__, success);
880 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
886 mm_answer_skeyrespond(int sock, Buffer *m)
891 response = buffer_get_string(m, NULL);
893 authok = (options.challenge_response_authentication &&
895 skey_haskey(authctxt->pw->pw_name) == 0 &&
896 skey_passcheck(authctxt->pw->pw_name, response) != -1);
901 buffer_put_int(m, authok);
903 debug3("%s: sending authenticated: %d", __func__, authok);
904 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
906 auth_method = "skey";
908 return (authok != 0);
914 mm_answer_pam_start(int sock, Buffer *m)
916 if (!options.use_pam)
917 fatal("UsePAM not set, but ended up in %s anyway", __func__);
921 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
927 mm_answer_pam_account(int sock, Buffer *m)
931 if (!options.use_pam)
932 fatal("UsePAM not set, but ended up in %s anyway", __func__);
934 ret = do_pam_account();
936 buffer_put_int(m, ret);
937 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
939 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
944 static void *sshpam_ctxt, *sshpam_authok;
945 extern KbdintDevice sshpam_device;
948 mm_answer_pam_init_ctx(int sock, Buffer *m)
951 debug3("%s", __func__);
952 authctxt->user = buffer_get_string(m, NULL);
953 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
954 sshpam_authok = NULL;
956 if (sshpam_ctxt != NULL) {
957 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
958 buffer_put_int(m, 1);
960 buffer_put_int(m, 0);
962 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
967 mm_answer_pam_query(int sock, Buffer *m)
969 char *name, *info, **prompts;
970 u_int i, num, *echo_on;
973 debug3("%s", __func__);
974 sshpam_authok = NULL;
975 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
976 if (ret == 0 && num == 0)
977 sshpam_authok = sshpam_ctxt;
978 if (num > 1 || name == NULL || info == NULL)
981 buffer_put_int(m, ret);
982 buffer_put_cstring(m, name);
984 buffer_put_cstring(m, info);
986 buffer_put_int(m, num);
987 for (i = 0; i < num; ++i) {
988 buffer_put_cstring(m, prompts[i]);
990 buffer_put_int(m, echo_on[i]);
996 auth_method = "keyboard-interactive/pam";
997 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
1002 mm_answer_pam_respond(int sock, Buffer *m)
1008 debug3("%s", __func__);
1009 sshpam_authok = NULL;
1010 num = buffer_get_int(m);
1012 resp = xcalloc(num, sizeof(char *));
1013 for (i = 0; i < num; ++i)
1014 resp[i] = buffer_get_string(m, NULL);
1015 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
1016 for (i = 0; i < num; ++i)
1020 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
1023 buffer_put_int(m, ret);
1024 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
1025 auth_method = "keyboard-interactive/pam";
1027 sshpam_authok = sshpam_ctxt;
1032 mm_answer_pam_free_ctx(int sock, Buffer *m)
1035 debug3("%s", __func__);
1036 (sshpam_device.free_ctx)(sshpam_ctxt);
1038 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
1039 auth_method = "keyboard-interactive/pam";
1040 return (sshpam_authok == sshpam_ctxt);
1045 mm_append_debug(Buffer *m)
1047 if (auth_debug_init && buffer_len(&auth_debug)) {
1048 debug3("%s: Appending debug messages for child", __func__);
1049 buffer_append(m, buffer_ptr(&auth_debug),
1050 buffer_len(&auth_debug));
1051 buffer_clear(&auth_debug);
1056 mm_answer_keyallowed(int sock, Buffer *m)
1059 char *cuser, *chost;
1062 enum mm_keytype type = 0;
1065 debug3("%s entering", __func__);
1067 type = buffer_get_int(m);
1068 cuser = buffer_get_string(m, NULL);
1069 chost = buffer_get_string(m, NULL);
1070 blob = buffer_get_string(m, &bloblen);
1072 key = key_from_blob(blob, bloblen);
1074 if ((compat20 && type == MM_RSAHOSTKEY) ||
1075 (!compat20 && type != MM_RSAHOSTKEY))
1076 fatal("%s: key type and protocol mismatch", __func__);
1078 debug3("%s: key_from_blob: %p", __func__, key);
1080 if (key != NULL && authctxt->valid) {
1083 allowed = options.pubkey_authentication &&
1084 user_key_allowed(authctxt->pw, key);
1085 auth_method = "publickey";
1086 if (options.pubkey_authentication && allowed != 1)
1087 auth_clear_options();
1090 allowed = options.hostbased_authentication &&
1091 hostbased_key_allowed(authctxt->pw,
1093 auth_method = "hostbased";
1096 key->type = KEY_RSA1; /* XXX */
1097 allowed = options.rhosts_rsa_authentication &&
1098 auth_rhosts_rsa_key_allowed(authctxt->pw,
1100 if (options.rhosts_rsa_authentication && allowed != 1)
1101 auth_clear_options();
1102 auth_method = "rsa";
1105 fatal("%s: unknown key type %d", __func__, type);
1112 /* clear temporarily storage (used by verify) */
1113 monitor_reset_key_state();
1116 /* Save temporarily for comparison in verify */
1118 key_bloblen = bloblen;
1119 key_blobtype = type;
1120 hostbased_cuser = cuser;
1121 hostbased_chost = chost;
1123 /* Log failed attempt */
1124 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
1130 debug3("%s: key %p is %s",
1131 __func__, key, allowed ? "allowed" : "not allowed");
1134 buffer_put_int(m, allowed);
1135 buffer_put_int(m, forced_command != NULL);
1139 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1141 if (type == MM_RSAHOSTKEY)
1142 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1148 monitor_valid_userblob(u_char *data, u_int datalen)
1156 buffer_append(&b, data, datalen);
1158 if (datafellows & SSH_OLD_SESSIONID) {
1160 len = buffer_len(&b);
1161 if ((session_id2 == NULL) ||
1162 (len < session_id2_len) ||
1163 (memcmp(p, session_id2, session_id2_len) != 0))
1165 buffer_consume(&b, session_id2_len);
1167 p = buffer_get_string(&b, &len);
1168 if ((session_id2 == NULL) ||
1169 (len != session_id2_len) ||
1170 (memcmp(p, session_id2, session_id2_len) != 0))
1174 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1176 p = buffer_get_string(&b, NULL);
1177 if (strcmp(authctxt->user, p) != 0) {
1178 logit("wrong user name passed to monitor: expected %s != %.100s",
1183 buffer_skip_string(&b);
1184 if (datafellows & SSH_BUG_PKAUTH) {
1185 if (!buffer_get_char(&b))
1188 p = buffer_get_string(&b, NULL);
1189 if (strcmp("publickey", p) != 0)
1192 if (!buffer_get_char(&b))
1194 buffer_skip_string(&b);
1196 buffer_skip_string(&b);
1197 if (buffer_len(&b) != 0)
1204 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1213 buffer_append(&b, data, datalen);
1215 p = buffer_get_string(&b, &len);
1216 if ((session_id2 == NULL) ||
1217 (len != session_id2_len) ||
1218 (memcmp(p, session_id2, session_id2_len) != 0))
1222 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1224 p = buffer_get_string(&b, NULL);
1225 if (strcmp(authctxt->user, p) != 0) {
1226 logit("wrong user name passed to monitor: expected %s != %.100s",
1231 buffer_skip_string(&b); /* service */
1232 p = buffer_get_string(&b, NULL);
1233 if (strcmp(p, "hostbased") != 0)
1236 buffer_skip_string(&b); /* pkalg */
1237 buffer_skip_string(&b); /* pkblob */
1239 /* verify client host, strip trailing dot if necessary */
1240 p = buffer_get_string(&b, NULL);
1241 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1243 if (strcmp(p, chost) != 0)
1247 /* verify client user */
1248 p = buffer_get_string(&b, NULL);
1249 if (strcmp(p, cuser) != 0)
1253 if (buffer_len(&b) != 0)
1260 mm_answer_keyverify(int sock, Buffer *m)
1263 u_char *signature, *data, *blob;
1264 u_int signaturelen, datalen, bloblen;
1268 blob = buffer_get_string(m, &bloblen);
1269 signature = buffer_get_string(m, &signaturelen);
1270 data = buffer_get_string(m, &datalen);
1272 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1273 !monitor_allowed_key(blob, bloblen))
1274 fatal("%s: bad key, not previously allowed", __func__);
1276 key = key_from_blob(blob, bloblen);
1278 fatal("%s: bad public key blob", __func__);
1280 switch (key_blobtype) {
1282 valid_data = monitor_valid_userblob(data, datalen);
1285 valid_data = monitor_valid_hostbasedblob(data, datalen,
1286 hostbased_cuser, hostbased_chost);
1293 fatal("%s: bad signature data blob", __func__);
1295 verified = key_verify(key, signature, signaturelen, data, datalen);
1296 debug3("%s: key %p signature %s",
1297 __func__, key, (verified == 1) ? "verified" : "unverified");
1304 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1306 monitor_reset_key_state();
1309 buffer_put_int(m, verified);
1310 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1312 return (verified == 1);
1316 mm_record_login(Session *s, struct passwd *pw)
1319 struct sockaddr_storage from;
1322 * Get IP address of client. If the connection is not a socket, let
1323 * the address be 0.0.0.0.
1325 memset(&from, 0, sizeof(from));
1326 fromlen = sizeof(from);
1327 if (packet_connection_is_on_socket()) {
1328 if (getpeername(packet_get_connection_in(),
1329 (struct sockaddr *)&from, &fromlen) < 0) {
1330 debug("getpeername: %.100s", strerror(errno));
1334 /* Record that there was a login on that tty from the remote host. */
1335 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1336 get_remote_name_or_ip(utmp_len, options.use_dns),
1337 (struct sockaddr *)&from, fromlen);
1341 mm_session_close(Session *s)
1343 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1344 if (s->ttyfd != -1) {
1345 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1346 session_pty_cleanup2(s);
1348 session_unused(s->self);
1352 mm_answer_pty(int sock, Buffer *m)
1354 extern struct monitor *pmonitor;
1358 debug3("%s entering", __func__);
1364 s->authctxt = authctxt;
1365 s->pw = authctxt->pw;
1366 s->pid = pmonitor->m_pid;
1367 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1370 pty_setowner(authctxt->pw, s->tty);
1372 buffer_put_int(m, 1);
1373 buffer_put_cstring(m, s->tty);
1375 /* We need to trick ttyslot */
1376 if (dup2(s->ttyfd, 0) == -1)
1377 fatal("%s: dup2", __func__);
1379 mm_record_login(s, authctxt->pw);
1381 /* Now we can close the file descriptor again */
1384 /* send messages generated by record_login */
1385 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1386 buffer_clear(&loginmsg);
1388 mm_request_send(sock, MONITOR_ANS_PTY, m);
1390 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1391 mm_send_fd(sock, s->ttyfd) == -1)
1392 fatal("%s: send fds failed", __func__);
1394 /* make sure nothing uses fd 0 */
1395 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1396 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1398 error("%s: fd0 %d != 0", __func__, fd0);
1400 /* slave is not needed */
1402 s->ttyfd = s->ptyfd;
1403 /* no need to dup() because nobody closes ptyfd */
1404 s->ptymaster = s->ptyfd;
1406 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1412 mm_session_close(s);
1413 buffer_put_int(m, 0);
1414 mm_request_send(sock, MONITOR_ANS_PTY, m);
1419 mm_answer_pty_cleanup(int sock, Buffer *m)
1424 debug3("%s entering", __func__);
1426 tty = buffer_get_string(m, NULL);
1427 if ((s = session_by_tty(tty)) != NULL)
1428 mm_session_close(s);
1435 mm_answer_sesskey(int sock, Buffer *m)
1440 /* Turn off permissions */
1441 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1443 if ((p = BN_new()) == NULL)
1444 fatal("%s: BN_new", __func__);
1446 buffer_get_bignum2(m, p);
1448 rsafail = ssh1_session_key(p);
1451 buffer_put_int(m, rsafail);
1452 buffer_put_bignum2(m, p);
1456 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1458 /* Turn on permissions for sessid passing */
1459 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1465 mm_answer_sessid(int sock, Buffer *m)
1469 debug3("%s entering", __func__);
1471 if (buffer_len(m) != 16)
1472 fatal("%s: bad ssh1 session id", __func__);
1473 for (i = 0; i < 16; i++)
1474 session_id[i] = buffer_get_char(m);
1476 /* Turn on permissions for getpwnam */
1477 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1483 mm_answer_rsa_keyallowed(int sock, Buffer *m)
1487 u_char *blob = NULL;
1491 debug3("%s entering", __func__);
1493 auth_method = "rsa";
1494 if (options.rsa_authentication && authctxt->valid) {
1495 if ((client_n = BN_new()) == NULL)
1496 fatal("%s: BN_new", __func__);
1497 buffer_get_bignum2(m, client_n);
1498 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1499 BN_clear_free(client_n);
1502 buffer_put_int(m, allowed);
1503 buffer_put_int(m, forced_command != NULL);
1505 /* clear temporarily storage (used by generate challenge) */
1506 monitor_reset_key_state();
1508 if (allowed && key != NULL) {
1509 key->type = KEY_RSA; /* cheat for key_to_blob */
1510 if (key_to_blob(key, &blob, &blen) == 0)
1511 fatal("%s: key_to_blob failed", __func__);
1512 buffer_put_string(m, blob, blen);
1514 /* Save temporarily for comparison in verify */
1517 key_blobtype = MM_RSAUSERKEY;
1524 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1526 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1527 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1532 mm_answer_rsa_challenge(int sock, Buffer *m)
1538 debug3("%s entering", __func__);
1540 if (!authctxt->valid)
1541 fatal("%s: authctxt not valid", __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", __func__);
1547 if ((key = key_from_blob(blob, blen)) == NULL)
1548 fatal("%s: received bad key", __func__);
1549 if (key->type != KEY_RSA)
1550 fatal("%s: received bad key type %d", __func__, key->type);
1551 key->type = KEY_RSA1;
1553 BN_clear_free(ssh1_challenge);
1554 ssh1_challenge = auth_rsa_generate_challenge(key);
1557 buffer_put_bignum2(m, ssh1_challenge);
1559 debug3("%s sending reply", __func__);
1560 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1562 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1570 mm_answer_rsa_response(int sock, Buffer *m)
1573 u_char *blob, *response;
1577 debug3("%s entering", __func__);
1579 if (!authctxt->valid)
1580 fatal("%s: authctxt not valid", __func__);
1581 if (ssh1_challenge == NULL)
1582 fatal("%s: no ssh1_challenge", __func__);
1584 blob = buffer_get_string(m, &blen);
1585 if (!monitor_allowed_key(blob, blen))
1586 fatal("%s: bad key, not previously allowed", __func__);
1587 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1588 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1589 if ((key = key_from_blob(blob, blen)) == NULL)
1590 fatal("%s: received bad key", __func__);
1591 response = buffer_get_string(m, &len);
1593 fatal("%s: received bad response to challenge", __func__);
1594 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1600 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1603 BN_clear_free(ssh1_challenge);
1604 ssh1_challenge = NULL;
1605 monitor_reset_key_state();
1608 buffer_put_int(m, success);
1609 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1615 mm_answer_term(int sock, Buffer *req)
1617 extern struct monitor *pmonitor;
1620 debug3("%s: tearing down sessions", __func__);
1622 /* The child is terminating */
1623 session_destroy_all(&mm_session_close);
1626 if (options.use_pam)
1630 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1634 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1636 /* Terminate process */
1640 #ifdef SSH_AUDIT_EVENTS
1641 /* Report that an audit event occurred */
1643 mm_answer_audit_event(int socket, Buffer *m)
1645 ssh_audit_event_t event;
1647 debug3("%s entering", __func__);
1649 event = buffer_get_int(m);
1651 case SSH_AUTH_FAIL_PUBKEY:
1652 case SSH_AUTH_FAIL_HOSTBASED:
1653 case SSH_AUTH_FAIL_GSSAPI:
1654 case SSH_LOGIN_EXCEED_MAXTRIES:
1655 case SSH_LOGIN_ROOT_DENIED:
1656 case SSH_CONNECTION_CLOSE:
1657 case SSH_INVALID_USER:
1661 fatal("Audit event type %d not permitted", event);
1668 mm_answer_audit_command(int socket, Buffer *m)
1673 debug3("%s entering", __func__);
1674 cmd = buffer_get_string(m, &len);
1675 /* sanity check command, if so how? */
1676 audit_run_command(cmd);
1680 #endif /* SSH_AUDIT_EVENTS */
1683 monitor_apply_keystate(struct monitor *pmonitor)
1686 set_newkeys(MODE_IN);
1687 set_newkeys(MODE_OUT);
1689 packet_set_protocol_flags(child_state.ssh1protoflags);
1690 packet_set_encryption_key(child_state.ssh1key,
1691 child_state.ssh1keylen, child_state.ssh1cipher);
1692 xfree(child_state.ssh1key);
1695 /* for rc4 and other stateful ciphers */
1696 packet_set_keycontext(MODE_OUT, child_state.keyout);
1697 xfree(child_state.keyout);
1698 packet_set_keycontext(MODE_IN, child_state.keyin);
1699 xfree(child_state.keyin);
1702 packet_set_iv(MODE_OUT, child_state.ivout);
1703 xfree(child_state.ivout);
1704 packet_set_iv(MODE_IN, child_state.ivin);
1705 xfree(child_state.ivin);
1708 memcpy(&incoming_stream, &child_state.incoming,
1709 sizeof(incoming_stream));
1710 memcpy(&outgoing_stream, &child_state.outgoing,
1711 sizeof(outgoing_stream));
1713 /* Update with new address */
1714 if (options.compression)
1715 mm_init_compression(pmonitor->m_zlib);
1717 /* Network I/O buffers */
1718 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1719 buffer_clear(packet_get_input());
1720 buffer_append(packet_get_input(), child_state.input, child_state.ilen);
1721 memset(child_state.input, 0, child_state.ilen);
1722 xfree(child_state.input);
1724 buffer_clear(packet_get_output());
1725 buffer_append(packet_get_output(), child_state.output,
1727 memset(child_state.output, 0, child_state.olen);
1728 xfree(child_state.output);
1732 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
1736 mm_get_kex(Buffer *m)
1742 kex = xcalloc(1, sizeof(*kex));
1743 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1744 if ((session_id2 == NULL) ||
1745 (kex->session_id_len != session_id2_len) ||
1746 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1747 fatal("mm_get_get: internal error: bad session id");
1748 kex->we_need = buffer_get_int(m);
1749 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1750 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1751 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1752 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1754 if (options.gss_keyex) {
1755 kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
1756 kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server;
1757 kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server;
1761 kex->hostkey_type = buffer_get_int(m);
1762 kex->kex_type = buffer_get_int(m);
1763 blob = buffer_get_string(m, &bloblen);
1764 buffer_init(&kex->my);
1765 buffer_append(&kex->my, blob, bloblen);
1767 blob = buffer_get_string(m, &bloblen);
1768 buffer_init(&kex->peer);
1769 buffer_append(&kex->peer, blob, bloblen);
1772 kex->flags = buffer_get_int(m);
1773 kex->client_version_string = buffer_get_string(m, NULL);
1774 kex->server_version_string = buffer_get_string(m, NULL);
1775 kex->load_host_key=&get_hostkey_by_type;
1776 kex->host_key_index=&get_hostkey_index;
1781 /* This function requries careful sanity checking */
1784 mm_get_keystate(struct monitor *pmonitor)
1788 u_int bloblen, plen;
1789 u_int32_t seqnr, packets;
1790 u_int64_t blocks, bytes;
1792 debug3("%s: Waiting for new keys", __func__);
1795 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1797 child_state.ssh1protoflags = buffer_get_int(&m);
1798 child_state.ssh1cipher = buffer_get_int(&m);
1799 child_state.ssh1key = buffer_get_string(&m,
1800 &child_state.ssh1keylen);
1801 child_state.ivout = buffer_get_string(&m,
1802 &child_state.ivoutlen);
1803 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1806 /* Get the Kex for rekeying */
1807 *pmonitor->m_pkex = mm_get_kex(&m);
1810 blob = buffer_get_string(&m, &bloblen);
1811 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1814 debug3("%s: Waiting for second key", __func__);
1815 blob = buffer_get_string(&m, &bloblen);
1816 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1819 /* Now get sequence numbers for the packets */
1820 seqnr = buffer_get_int(&m);
1821 blocks = buffer_get_int64(&m);
1822 packets = buffer_get_int(&m);
1823 bytes = buffer_get_int64(&m);
1824 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1825 seqnr = buffer_get_int(&m);
1826 blocks = buffer_get_int64(&m);
1827 packets = buffer_get_int(&m);
1828 bytes = buffer_get_int64(&m);
1829 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1832 /* Get the key context */
1833 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1834 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1836 debug3("%s: Getting compression state", __func__);
1837 /* Get compression state */
1838 p = buffer_get_string(&m, &plen);
1839 if (plen != sizeof(child_state.outgoing))
1840 fatal("%s: bad request size", __func__);
1841 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1844 p = buffer_get_string(&m, &plen);
1845 if (plen != sizeof(child_state.incoming))
1846 fatal("%s: bad request size", __func__);
1847 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1850 /* Network I/O buffers */
1851 debug3("%s: Getting Network I/O buffers", __func__);
1852 child_state.input = buffer_get_string(&m, &child_state.ilen);
1853 child_state.output = buffer_get_string(&m, &child_state.olen);
1857 child_state.sent_bytes = buffer_get_int64(&m);
1858 child_state.recv_bytes = buffer_get_int64(&m);
1865 /* Allocation functions for zlib */
1867 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1869 size_t len = (size_t) size * ncount;
1872 if (len == 0 || ncount > SIZE_T_MAX / size)
1873 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1875 address = mm_malloc(mm, len);
1881 mm_zfree(struct mm_master *mm, void *address)
1883 mm_free(mm, address);
1887 mm_init_compression(struct mm_master *mm)
1889 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1890 outgoing_stream.zfree = (free_func)mm_zfree;
1891 outgoing_stream.opaque = mm;
1893 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1894 incoming_stream.zfree = (free_func)mm_zfree;
1895 incoming_stream.opaque = mm;
1900 #define FD_CLOSEONEXEC(x) do { \
1901 if (fcntl(x, F_SETFD, 1) == -1) \
1902 fatal("fcntl(%d, F_SETFD)", x); \
1906 monitor_socketpair(int *pair)
1908 #ifdef HAVE_SOCKETPAIR
1909 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1910 fatal("%s: socketpair", __func__);
1912 fatal("%s: UsePrivilegeSeparation=yes not supported",
1915 FD_CLOSEONEXEC(pair[0]);
1916 FD_CLOSEONEXEC(pair[1]);
1919 #define MM_MEMSIZE 65536
1924 struct monitor *mon;
1927 mon = xcalloc(1, sizeof(*mon));
1929 monitor_socketpair(pair);
1931 mon->m_recvfd = pair[0];
1932 mon->m_sendfd = pair[1];
1934 /* Used to share zlib space across processes */
1935 if (options.compression) {
1936 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1937 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1939 /* Compression needs to share state across borders */
1940 mm_init_compression(mon->m_zlib);
1947 monitor_reinit(struct monitor *mon)
1951 monitor_socketpair(pair);
1953 mon->m_recvfd = pair[0];
1954 mon->m_sendfd = pair[1];
1959 mm_answer_gss_setup_ctx(int sock, Buffer *m)
1965 if (!options.gss_authentication && !options.gss_keyex)
1966 fatal("In GSSAPI monitor when GSSAPI is disabled");
1968 goid.elements = buffer_get_string(m, &len);
1971 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1973 xfree(goid.elements);
1976 buffer_put_int(m, major);
1978 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1980 /* Now we have a context, enable the step */
1981 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1987 mm_answer_gss_accept_ctx(int sock, Buffer *m)
1990 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1991 OM_uint32 major, minor;
1992 OM_uint32 flags = 0; /* GSI needs this */
1995 if (!options.gss_authentication && !options.gss_keyex)
1996 fatal("In GSSAPI monitor when GSSAPI is disabled");
1998 in.value = buffer_get_string(m, &len);
2000 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
2004 buffer_put_int(m, major);
2005 buffer_put_string(m, out.value, out.length);
2006 buffer_put_int(m, flags);
2007 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
2009 gss_release_buffer(&minor, &out);
2011 if (major == GSS_S_COMPLETE) {
2012 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
2013 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
2014 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
2015 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
2016 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
2022 mm_answer_gss_checkmic(int sock, Buffer *m)
2024 gss_buffer_desc gssbuf, mic;
2028 if (!options.gss_authentication && !options.gss_keyex)
2029 fatal("In GSSAPI monitor when GSSAPI is disabled");
2031 gssbuf.value = buffer_get_string(m, &len);
2032 gssbuf.length = len;
2033 mic.value = buffer_get_string(m, &len);
2036 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
2038 xfree(gssbuf.value);
2042 buffer_put_int(m, ret);
2044 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
2046 if (!GSS_ERROR(ret))
2047 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
2053 mm_answer_gss_userok(int sock, Buffer *m)
2058 if (!options.gss_authentication && !options.gss_keyex)
2059 fatal("In GSSAPI monitor when GSSAPI is disabled");
2061 gssapi_keyex = buffer_get_int(m);
2063 authenticated = authctxt->valid &&
2064 ssh_gssapi_userok(authctxt->user, authctxt->pw, gssapi_keyex);
2067 buffer_put_int(m, authenticated);
2069 debug3("%s: sending result %d", __func__, authenticated);
2070 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
2073 auth_method = "gssapi-keyex";
2075 auth_method = "gssapi-with-mic";
2077 /* Monitor loop will terminate if authenticated */
2078 return (authenticated);
2082 mm_answer_gss_error(int socket, Buffer *m) {
2083 OM_uint32 major,minor;
2086 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
2088 buffer_put_int(m,major);
2089 buffer_put_int(m,minor);
2090 buffer_put_cstring(m,msg);
2092 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
2100 mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
2101 OM_uint32 major,minor;
2102 gss_OID_set mech_set;
2105 major=gss_indicate_mechs(&minor, &mech_set);
2108 buffer_put_int(m, major);
2109 buffer_put_int(m, mech_set->count);
2110 for (i=0; i < mech_set->count; i++) {
2111 buffer_put_string(m, mech_set->elements[i].elements,
2112 mech_set->elements[i].length);
2115 #if !defined(MECHGLUE) /* mechglue memory management bug ??? */
2116 gss_release_oid_set(&minor,&mech_set);
2119 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
2125 mm_answer_gss_localname(int socket, Buffer *m) {
2128 ssh_gssapi_localname(&name);
2132 buffer_put_cstring(m, name);
2133 debug3("%s: sending result %s", __func__, name);
2136 buffer_put_cstring(m, "");
2137 debug3("%s: sending result \"\"", __func__);
2140 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);
2146 mm_answer_gss_sign(int socket, Buffer *m)
2148 gss_buffer_desc data;
2149 gss_buffer_desc hash = GSS_C_EMPTY_BUFFER;
2150 OM_uint32 major, minor;
2153 if (!options.gss_authentication && !options.gss_keyex)
2154 fatal("In GSSAPI monitor when GSSAPI is disabled");
2156 data.value = buffer_get_string(m, &len);
2158 if (data.length != 20)
2159 fatal("%s: data length incorrect: %d", __func__,
2162 /* Save the session ID on the first time around */
2163 if (session_id2_len == 0) {
2164 session_id2_len = data.length;
2165 session_id2 = xmalloc(session_id2_len);
2166 memcpy(session_id2, data.value, session_id2_len);
2168 major = ssh_gssapi_sign(gsscontext, &data, &hash);
2173 buffer_put_int(m, major);
2174 buffer_put_string(m, hash.value, hash.length);
2176 mm_request_send(socket, MONITOR_ANS_GSSSIGN, m);
2178 gss_release_buffer(&minor, &hash);
2180 /* Turn on getpwnam permissions */
2181 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
2183 /* And credential updating, for when rekeying */
2184 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUPCREDS, 1);
2190 mm_answer_gss_updatecreds(int socket, Buffer *m) {
2191 ssh_gssapi_ccache store;
2194 store.filename = buffer_get_string(m, NULL);
2195 store.envvar = buffer_get_string(m, NULL);
2196 store.envval = buffer_get_string(m, NULL);
2198 ok = ssh_gssapi_update_creds(&store);
2200 xfree(store.filename);
2201 xfree(store.envvar);
2202 xfree(store.envval);
2205 buffer_put_int(m, ok);
2207 mm_request_send(socket, MONITOR_ANS_GSSUPCREDS, m);
2216 mm_answer_jpake_step1(int sock, Buffer *m)
2218 struct jpake_ctx *pctx;
2219 u_char *x3_proof, *x4_proof;
2220 u_int x3_proof_len, x4_proof_len;
2222 if (!options.zero_knowledge_password_authentication)
2223 fatal("zero_knowledge_password_authentication disabled");
2225 if (authctxt->jpake_ctx != NULL)
2226 fatal("%s: authctxt->jpake_ctx already set (%p)",
2227 __func__, authctxt->jpake_ctx);
2228 authctxt->jpake_ctx = pctx = jpake_new();
2230 jpake_step1(pctx->grp,
2231 &pctx->server_id, &pctx->server_id_len,
2232 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4,
2233 &x3_proof, &x3_proof_len,
2234 &x4_proof, &x4_proof_len);
2236 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__));
2240 buffer_put_string(m, pctx->server_id, pctx->server_id_len);
2241 buffer_put_bignum2(m, pctx->g_x3);
2242 buffer_put_bignum2(m, pctx->g_x4);
2243 buffer_put_string(m, x3_proof, x3_proof_len);
2244 buffer_put_string(m, x4_proof, x4_proof_len);
2246 debug3("%s: sending step1", __func__);
2247 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m);
2249 bzero(x3_proof, x3_proof_len);
2250 bzero(x4_proof, x4_proof_len);
2254 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1);
2255 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0);
2261 mm_answer_jpake_get_pwdata(int sock, Buffer *m)
2263 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2264 char *hash_scheme, *salt;
2267 fatal("%s: pctx == NULL", __func__);
2269 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt);
2272 /* pctx->s is sensitive, not returned to slave */
2273 buffer_put_cstring(m, hash_scheme);
2274 buffer_put_cstring(m, salt);
2276 debug3("%s: sending pwdata", __func__);
2277 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m);
2279 bzero(hash_scheme, strlen(hash_scheme));
2280 bzero(salt, strlen(salt));
2284 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1);
2290 mm_answer_jpake_step2(int sock, Buffer *m)
2292 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2293 u_char *x1_proof, *x2_proof, *x4_s_proof;
2294 u_int x1_proof_len, x2_proof_len, x4_s_proof_len;
2297 fatal("%s: pctx == NULL", __func__);
2299 if ((pctx->g_x1 = BN_new()) == NULL ||
2300 (pctx->g_x2 = BN_new()) == NULL)
2301 fatal("%s: BN_new", __func__);
2302 buffer_get_bignum2(m, pctx->g_x1);
2303 buffer_get_bignum2(m, pctx->g_x2);
2304 pctx->client_id = buffer_get_string(m, &pctx->client_id_len);
2305 x1_proof = buffer_get_string(m, &x1_proof_len);
2306 x2_proof = buffer_get_string(m, &x2_proof_len);
2308 jpake_step2(pctx->grp, pctx->s, pctx->g_x3,
2309 pctx->g_x1, pctx->g_x2, pctx->x4,
2310 pctx->client_id, pctx->client_id_len,
2311 pctx->server_id, pctx->server_id_len,
2312 x1_proof, x1_proof_len,
2313 x2_proof, x2_proof_len,
2315 &x4_s_proof, &x4_s_proof_len);
2317 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__));
2319 bzero(x1_proof, x1_proof_len);
2320 bzero(x2_proof, x2_proof_len);
2326 buffer_put_bignum2(m, pctx->b);
2327 buffer_put_string(m, x4_s_proof, x4_s_proof_len);
2329 debug3("%s: sending step2", __func__);
2330 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m);
2332 bzero(x4_s_proof, x4_s_proof_len);
2335 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1);
2341 mm_answer_jpake_key_confirm(int sock, Buffer *m)
2343 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2345 u_int x2_s_proof_len;
2348 fatal("%s: pctx == NULL", __func__);
2350 if ((pctx->a = BN_new()) == NULL)
2351 fatal("%s: BN_new", __func__);
2352 buffer_get_bignum2(m, pctx->a);
2353 x2_s_proof = buffer_get_string(m, &x2_s_proof_len);
2355 jpake_key_confirm(pctx->grp, pctx->s, pctx->a,
2356 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2,
2357 pctx->server_id, pctx->server_id_len,
2358 pctx->client_id, pctx->client_id_len,
2359 session_id2, session_id2_len,
2360 x2_s_proof, x2_s_proof_len,
2362 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len);
2364 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__));
2366 bzero(x2_s_proof, x2_s_proof_len);
2369 /* pctx->k is sensitive, not sent */
2370 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len);
2372 debug3("%s: sending confirmation hash", __func__);
2373 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m);
2375 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1);
2381 mm_answer_jpake_check_confirm(int sock, Buffer *m)
2383 int authenticated = 0;
2384 u_char *peer_confirm_hash;
2385 u_int peer_confirm_hash_len;
2386 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2389 fatal("%s: pctx == NULL", __func__);
2391 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len);
2393 authenticated = jpake_check_confirm(pctx->k,
2394 pctx->client_id, pctx->client_id_len,
2395 session_id2, session_id2_len,
2396 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid;
2398 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__));
2400 bzero(peer_confirm_hash, peer_confirm_hash_len);
2401 xfree(peer_confirm_hash);
2404 buffer_put_int(m, authenticated);
2406 debug3("%s: sending result %d", __func__, authenticated);
2407 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m);
2409 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1);
2411 auth_method = "jpake-01@openssh.com";
2412 return authenticated;