1 /* $OpenBSD: monitor.c,v 1.99 2008/07/10 18:08:11 markus 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"
92 static Gssctxt
*gsscontext
= NULL
;
96 extern ServerOptions options
;
97 extern u_int utmp_len
;
98 extern Newkeys
*current_keys
[];
99 extern z_stream incoming_stream
;
100 extern z_stream outgoing_stream
;
101 extern u_char session_id
[];
102 extern Buffer input
, output
;
103 extern Buffer auth_debug
;
104 extern int auth_debug_init
;
105 extern Buffer loginmsg
;
107 /* State exported from the child */
130 /* Functions on the monitor that answer unprivileged requests */
132 int mm_answer_moduli(int, Buffer
*);
133 int mm_answer_sign(int, Buffer
*);
134 int mm_answer_pwnamallow(int, Buffer
*);
135 int mm_answer_auth2_read_banner(int, Buffer
*);
136 int mm_answer_authserv(int, Buffer
*);
137 int mm_answer_authpassword(int, Buffer
*);
138 int mm_answer_bsdauthquery(int, Buffer
*);
139 int mm_answer_bsdauthrespond(int, Buffer
*);
140 int mm_answer_skeyquery(int, Buffer
*);
141 int mm_answer_skeyrespond(int, Buffer
*);
142 int mm_answer_keyallowed(int, Buffer
*);
143 int mm_answer_keyverify(int, Buffer
*);
144 int mm_answer_pty(int, Buffer
*);
145 int mm_answer_pty_cleanup(int, Buffer
*);
146 int mm_answer_term(int, Buffer
*);
147 int mm_answer_rsa_keyallowed(int, Buffer
*);
148 int mm_answer_rsa_challenge(int, Buffer
*);
149 int mm_answer_rsa_response(int, Buffer
*);
150 int mm_answer_sesskey(int, Buffer
*);
151 int mm_answer_sessid(int, Buffer
*);
154 int mm_answer_pam_start(int, Buffer
*);
155 int mm_answer_pam_account(int, Buffer
*);
156 int mm_answer_pam_init_ctx(int, Buffer
*);
157 int mm_answer_pam_query(int, Buffer
*);
158 int mm_answer_pam_respond(int, Buffer
*);
159 int mm_answer_pam_free_ctx(int, Buffer
*);
163 int mm_answer_gss_setup_ctx(int, Buffer
*);
164 int mm_answer_gss_accept_ctx(int, Buffer
*);
165 int mm_answer_gss_userok(int, Buffer
*);
166 int mm_answer_gss_checkmic(int, Buffer
*);
169 #ifdef SSH_AUDIT_EVENTS
170 int mm_answer_audit_event(int, Buffer
*);
171 int mm_answer_audit_command(int, Buffer
*);
174 static Authctxt
*authctxt
;
175 static BIGNUM
*ssh1_challenge
= NULL
; /* used for ssh1 rsa auth */
177 /* local state for key verify */
178 static u_char
*key_blob
= NULL
;
179 static u_int key_bloblen
= 0;
180 static int key_blobtype
= MM_NOKEY
;
181 static char *hostbased_cuser
= NULL
;
182 static char *hostbased_chost
= NULL
;
183 static char *auth_method
= "unknown";
184 static u_int session_id2_len
= 0;
185 static u_char
*session_id2
= NULL
;
186 static pid_t monitor_child_pid
;
189 enum monitor_reqtype type
;
191 int (*f
)(int, Buffer
*);
194 #define MON_ISAUTH 0x0004 /* Required for Authentication */
195 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
196 #define MON_ONCE 0x0010 /* Disable after calling */
197 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
199 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
201 #define MON_PERMIT 0x1000 /* Request is permitted */
203 struct mon_table mon_dispatch_proto20
[] = {
204 {MONITOR_REQ_MODULI
, MON_ONCE
, mm_answer_moduli
},
205 {MONITOR_REQ_SIGN
, MON_ONCE
, mm_answer_sign
},
206 {MONITOR_REQ_PWNAM
, MON_ONCE
, mm_answer_pwnamallow
},
207 {MONITOR_REQ_AUTHSERV
, MON_ONCE
, mm_answer_authserv
},
208 {MONITOR_REQ_AUTH2_READ_BANNER
, MON_ONCE
, mm_answer_auth2_read_banner
},
209 {MONITOR_REQ_AUTHPASSWORD
, MON_AUTH
, mm_answer_authpassword
},
211 {MONITOR_REQ_PAM_START
, MON_ONCE
, mm_answer_pam_start
},
212 {MONITOR_REQ_PAM_ACCOUNT
, 0, mm_answer_pam_account
},
213 {MONITOR_REQ_PAM_INIT_CTX
, MON_ISAUTH
, mm_answer_pam_init_ctx
},
214 {MONITOR_REQ_PAM_QUERY
, MON_ISAUTH
, mm_answer_pam_query
},
215 {MONITOR_REQ_PAM_RESPOND
, MON_ISAUTH
, mm_answer_pam_respond
},
216 {MONITOR_REQ_PAM_FREE_CTX
, MON_ONCE
|MON_AUTHDECIDE
, mm_answer_pam_free_ctx
},
218 #ifdef SSH_AUDIT_EVENTS
219 {MONITOR_REQ_AUDIT_EVENT
, MON_PERMIT
, mm_answer_audit_event
},
222 {MONITOR_REQ_BSDAUTHQUERY
, MON_ISAUTH
, mm_answer_bsdauthquery
},
223 {MONITOR_REQ_BSDAUTHRESPOND
, MON_AUTH
, mm_answer_bsdauthrespond
},
226 {MONITOR_REQ_SKEYQUERY
, MON_ISAUTH
, mm_answer_skeyquery
},
227 {MONITOR_REQ_SKEYRESPOND
, MON_AUTH
, mm_answer_skeyrespond
},
229 {MONITOR_REQ_KEYALLOWED
, MON_ISAUTH
, mm_answer_keyallowed
},
230 {MONITOR_REQ_KEYVERIFY
, MON_AUTH
, mm_answer_keyverify
},
232 {MONITOR_REQ_GSSSETUP
, MON_ISAUTH
, mm_answer_gss_setup_ctx
},
233 {MONITOR_REQ_GSSSTEP
, MON_ISAUTH
, mm_answer_gss_accept_ctx
},
234 {MONITOR_REQ_GSSUSEROK
, MON_AUTH
, mm_answer_gss_userok
},
235 {MONITOR_REQ_GSSCHECKMIC
, MON_ISAUTH
, mm_answer_gss_checkmic
},
240 struct mon_table mon_dispatch_postauth20
[] = {
241 {MONITOR_REQ_MODULI
, 0, mm_answer_moduli
},
242 {MONITOR_REQ_SIGN
, 0, mm_answer_sign
},
243 {MONITOR_REQ_PTY
, 0, mm_answer_pty
},
244 {MONITOR_REQ_PTYCLEANUP
, 0, mm_answer_pty_cleanup
},
245 {MONITOR_REQ_TERM
, 0, mm_answer_term
},
246 #ifdef SSH_AUDIT_EVENTS
247 {MONITOR_REQ_AUDIT_EVENT
, MON_PERMIT
, mm_answer_audit_event
},
248 {MONITOR_REQ_AUDIT_COMMAND
, MON_PERMIT
, mm_answer_audit_command
},
253 struct mon_table mon_dispatch_proto15
[] = {
254 {MONITOR_REQ_PWNAM
, MON_ONCE
, mm_answer_pwnamallow
},
255 {MONITOR_REQ_SESSKEY
, MON_ONCE
, mm_answer_sesskey
},
256 {MONITOR_REQ_SESSID
, MON_ONCE
, mm_answer_sessid
},
257 {MONITOR_REQ_AUTHPASSWORD
, MON_AUTH
, mm_answer_authpassword
},
258 {MONITOR_REQ_RSAKEYALLOWED
, MON_ISAUTH
|MON_ALOG
, mm_answer_rsa_keyallowed
},
259 {MONITOR_REQ_KEYALLOWED
, MON_ISAUTH
|MON_ALOG
, mm_answer_keyallowed
},
260 {MONITOR_REQ_RSACHALLENGE
, MON_ONCE
, mm_answer_rsa_challenge
},
261 {MONITOR_REQ_RSARESPONSE
, MON_ONCE
|MON_AUTHDECIDE
, mm_answer_rsa_response
},
263 {MONITOR_REQ_BSDAUTHQUERY
, MON_ISAUTH
, mm_answer_bsdauthquery
},
264 {MONITOR_REQ_BSDAUTHRESPOND
, MON_AUTH
, mm_answer_bsdauthrespond
},
267 {MONITOR_REQ_SKEYQUERY
, MON_ISAUTH
, mm_answer_skeyquery
},
268 {MONITOR_REQ_SKEYRESPOND
, MON_AUTH
, mm_answer_skeyrespond
},
271 {MONITOR_REQ_PAM_START
, MON_ONCE
, mm_answer_pam_start
},
272 {MONITOR_REQ_PAM_ACCOUNT
, 0, mm_answer_pam_account
},
273 {MONITOR_REQ_PAM_INIT_CTX
, MON_ISAUTH
, mm_answer_pam_init_ctx
},
274 {MONITOR_REQ_PAM_QUERY
, MON_ISAUTH
, mm_answer_pam_query
},
275 {MONITOR_REQ_PAM_RESPOND
, MON_ISAUTH
, mm_answer_pam_respond
},
276 {MONITOR_REQ_PAM_FREE_CTX
, MON_ONCE
|MON_AUTHDECIDE
, mm_answer_pam_free_ctx
},
278 #ifdef SSH_AUDIT_EVENTS
279 {MONITOR_REQ_AUDIT_EVENT
, MON_PERMIT
, mm_answer_audit_event
},
284 struct mon_table mon_dispatch_postauth15
[] = {
285 {MONITOR_REQ_PTY
, MON_ONCE
, mm_answer_pty
},
286 {MONITOR_REQ_PTYCLEANUP
, MON_ONCE
, mm_answer_pty_cleanup
},
287 {MONITOR_REQ_TERM
, 0, mm_answer_term
},
288 #ifdef SSH_AUDIT_EVENTS
289 {MONITOR_REQ_AUDIT_EVENT
, MON_PERMIT
, mm_answer_audit_event
},
290 {MONITOR_REQ_AUDIT_COMMAND
, MON_PERMIT
|MON_ONCE
, mm_answer_audit_command
},
295 struct mon_table
*mon_dispatch
;
297 /* Specifies if a certain message is allowed at the moment */
300 monitor_permit(struct mon_table
*ent
, enum monitor_reqtype type
, int permit
)
302 while (ent
->f
!= NULL
) {
303 if (ent
->type
== type
) {
304 ent
->flags
&= ~MON_PERMIT
;
305 ent
->flags
|= permit
? MON_PERMIT
: 0;
313 monitor_permit_authentications(int permit
)
315 struct mon_table
*ent
= mon_dispatch
;
317 while (ent
->f
!= NULL
) {
318 if (ent
->flags
& MON_AUTH
) {
319 ent
->flags
&= ~MON_PERMIT
;
320 ent
->flags
|= permit
? MON_PERMIT
: 0;
327 monitor_child_preauth(Authctxt
*_authctxt
, struct monitor
*pmonitor
)
329 struct mon_table
*ent
;
330 int authenticated
= 0;
332 debug3("preauth child monitor started");
334 authctxt
= _authctxt
;
335 memset(authctxt
, 0, sizeof(*authctxt
));
337 authctxt
->loginmsg
= &loginmsg
;
340 mon_dispatch
= mon_dispatch_proto20
;
342 /* Permit requests for moduli and signatures */
343 monitor_permit(mon_dispatch
, MONITOR_REQ_MODULI
, 1);
344 monitor_permit(mon_dispatch
, MONITOR_REQ_SIGN
, 1);
346 mon_dispatch
= mon_dispatch_proto15
;
348 monitor_permit(mon_dispatch
, MONITOR_REQ_SESSKEY
, 1);
351 /* The first few requests do not require asynchronous access */
352 while (!authenticated
) {
353 auth_method
= "unknown";
354 authenticated
= (monitor_read(pmonitor
, mon_dispatch
, &ent
) == 1);
356 if (!(ent
->flags
& MON_AUTHDECIDE
))
357 fatal("%s: unexpected authentication from %d",
358 __func__
, ent
->type
);
359 if (authctxt
->pw
->pw_uid
== 0 &&
360 !auth_root_allowed(auth_method
))
363 /* PAM needs to perform account checks after auth */
364 if (options
.use_pam
&& authenticated
) {
368 mm_request_receive_expect(pmonitor
->m_sendfd
,
369 MONITOR_REQ_PAM_ACCOUNT
, &m
);
370 authenticated
= mm_answer_pam_account(pmonitor
->m_sendfd
, &m
);
376 if (ent
->flags
& (MON_AUTHDECIDE
|MON_ALOG
)) {
377 auth_log(authctxt
, authenticated
, auth_method
,
378 compat20
? " ssh2" : "");
380 authctxt
->failures
++;
384 if (!authctxt
->valid
)
385 fatal("%s: authenticated invalid user", __func__
);
386 if (strcmp(auth_method
, "unknown") == 0)
387 fatal("%s: authentication method name unknown", __func__
);
389 debug("%s: %s has been authenticated by privileged process",
390 __func__
, authctxt
->user
);
392 mm_get_keystate(pmonitor
);
396 monitor_set_child_handler(pid_t pid
)
398 monitor_child_pid
= pid
;
402 monitor_child_handler(int sig
)
404 kill(monitor_child_pid
, sig
);
408 monitor_child_postauth(struct monitor
*pmonitor
)
410 monitor_set_child_handler(pmonitor
->m_pid
);
411 signal(SIGHUP
, &monitor_child_handler
);
412 signal(SIGTERM
, &monitor_child_handler
);
413 signal(SIGINT
, &monitor_child_handler
);
416 mon_dispatch
= mon_dispatch_postauth20
;
418 /* Permit requests for moduli and signatures */
419 monitor_permit(mon_dispatch
, MONITOR_REQ_MODULI
, 1);
420 monitor_permit(mon_dispatch
, MONITOR_REQ_SIGN
, 1);
421 monitor_permit(mon_dispatch
, MONITOR_REQ_TERM
, 1);
423 mon_dispatch
= mon_dispatch_postauth15
;
424 monitor_permit(mon_dispatch
, MONITOR_REQ_TERM
, 1);
427 monitor_permit(mon_dispatch
, MONITOR_REQ_PTY
, 1);
428 monitor_permit(mon_dispatch
, MONITOR_REQ_PTYCLEANUP
, 1);
432 monitor_read(pmonitor
, mon_dispatch
, NULL
);
436 monitor_sync(struct monitor
*pmonitor
)
438 if (options
.compression
) {
439 /* The member allocation is not visible, so sync it */
440 mm_share_sync(&pmonitor
->m_zlib
, &pmonitor
->m_zback
);
445 monitor_read(struct monitor
*pmonitor
, struct mon_table
*ent
,
446 struct mon_table
**pent
)
454 mm_request_receive(pmonitor
->m_sendfd
, &m
);
455 type
= buffer_get_char(&m
);
457 debug3("%s: checking request %d", __func__
, type
);
459 while (ent
->f
!= NULL
) {
460 if (ent
->type
== type
)
465 if (ent
->f
!= NULL
) {
466 if (!(ent
->flags
& MON_PERMIT
))
467 fatal("%s: unpermitted request %d", __func__
,
469 ret
= (*ent
->f
)(pmonitor
->m_sendfd
, &m
);
472 /* The child may use this request only once, disable it */
473 if (ent
->flags
& MON_ONCE
) {
474 debug2("%s: %d used once, disabling now", __func__
,
476 ent
->flags
&= ~MON_PERMIT
;
485 fatal("%s: unsupported request: %d", __func__
, type
);
491 /* allowed key state */
493 monitor_allowed_key(u_char
*blob
, u_int bloblen
)
495 /* make sure key is allowed */
496 if (key_blob
== NULL
|| key_bloblen
!= bloblen
||
497 memcmp(key_blob
, blob
, key_bloblen
))
503 monitor_reset_key_state(void)
506 if (key_blob
!= NULL
)
508 if (hostbased_cuser
!= NULL
)
509 xfree(hostbased_cuser
);
510 if (hostbased_chost
!= NULL
)
511 xfree(hostbased_chost
);
514 key_blobtype
= MM_NOKEY
;
515 hostbased_cuser
= NULL
;
516 hostbased_chost
= NULL
;
520 mm_answer_moduli(int sock
, Buffer
*m
)
525 min
= buffer_get_int(m
);
526 want
= buffer_get_int(m
);
527 max
= buffer_get_int(m
);
529 debug3("%s: got parameters: %d %d %d",
530 __func__
, min
, want
, max
);
531 /* We need to check here, too, in case the child got corrupted */
532 if (max
< min
|| want
< min
|| max
< want
)
533 fatal("%s: bad parameters: %d %d %d",
534 __func__
, min
, want
, max
);
538 dh
= choose_dh(min
, want
, max
);
540 buffer_put_char(m
, 0);
543 /* Send first bignum */
544 buffer_put_char(m
, 1);
545 buffer_put_bignum2(m
, dh
->p
);
546 buffer_put_bignum2(m
, dh
->g
);
550 mm_request_send(sock
, MONITOR_ANS_MODULI
, m
);
555 mm_answer_sign(int sock
, Buffer
*m
)
560 u_int siglen
, datlen
;
563 debug3("%s", __func__
);
565 keyid
= buffer_get_int(m
);
566 p
= buffer_get_string(m
, &datlen
);
569 * Supported KEX types will only return SHA1 (20 byte) or
570 * SHA256 (32 byte) hashes
572 if (datlen
!= 20 && datlen
!= 32)
573 fatal("%s: data length incorrect: %u", __func__
, datlen
);
575 /* save session id, it will be passed on the first call */
576 if (session_id2_len
== 0) {
577 session_id2_len
= datlen
;
578 session_id2
= xmalloc(session_id2_len
);
579 memcpy(session_id2
, p
, session_id2_len
);
582 if ((key
= get_hostkey_by_index(keyid
)) == NULL
)
583 fatal("%s: no hostkey from index %d", __func__
, keyid
);
584 if (key_sign(key
, &signature
, &siglen
, p
, datlen
) < 0)
585 fatal("%s: key_sign failed", __func__
);
587 debug3("%s: signature %p(%u)", __func__
, signature
, siglen
);
590 buffer_put_string(m
, signature
, siglen
);
595 mm_request_send(sock
, MONITOR_ANS_SIGN
, m
);
597 /* Turn on permissions for getpwnam */
598 monitor_permit(mon_dispatch
, MONITOR_REQ_PWNAM
, 1);
603 /* Retrieves the password entry and also checks if the user is permitted */
606 mm_answer_pwnamallow(int sock
, Buffer
*m
)
609 struct passwd
*pwent
;
612 debug3("%s", __func__
);
614 if (authctxt
->attempt
++ != 0)
615 fatal("%s: multiple attempts for getpwnam", __func__
);
617 username
= buffer_get_string(m
, NULL
);
619 pwent
= getpwnamallow(username
);
621 authctxt
->user
= xstrdup(username
);
622 setproctitle("%s [priv]", pwent
? username
: "unknown");
628 buffer_put_char(m
, 0);
629 authctxt
->pw
= fakepw();
634 authctxt
->pw
= pwent
;
637 buffer_put_char(m
, 1);
638 buffer_put_string(m
, pwent
, sizeof(struct passwd
));
639 buffer_put_cstring(m
, pwent
->pw_name
);
640 buffer_put_cstring(m
, "*");
641 buffer_put_cstring(m
, pwent
->pw_gecos
);
642 #ifdef HAVE_PW_CLASS_IN_PASSWD
643 buffer_put_cstring(m
, pwent
->pw_class
);
645 buffer_put_cstring(m
, pwent
->pw_dir
);
646 buffer_put_cstring(m
, pwent
->pw_shell
);
649 buffer_put_string(m
, &options
, sizeof(options
));
650 if (options
.banner
!= NULL
)
651 buffer_put_cstring(m
, options
.banner
);
652 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__
, allowed
);
653 mm_request_send(sock
, MONITOR_ANS_PWNAM
, m
);
655 /* For SSHv1 allow authentication now */
657 monitor_permit_authentications(1);
659 /* Allow service/style information on the auth context */
660 monitor_permit(mon_dispatch
, MONITOR_REQ_AUTHSERV
, 1);
661 monitor_permit(mon_dispatch
, MONITOR_REQ_AUTH2_READ_BANNER
, 1);
666 monitor_permit(mon_dispatch
, MONITOR_REQ_PAM_START
, 1);
672 int mm_answer_auth2_read_banner(int sock
, Buffer
*m
)
677 banner
= auth2_read_banner();
678 buffer_put_cstring(m
, banner
!= NULL
? banner
: "");
679 mm_request_send(sock
, MONITOR_ANS_AUTH2_READ_BANNER
, m
);
688 mm_answer_authserv(int sock
, Buffer
*m
)
690 monitor_permit_authentications(1);
692 authctxt
->service
= buffer_get_string(m
, NULL
);
693 authctxt
->style
= buffer_get_string(m
, NULL
);
694 debug3("%s: service=%s, style=%s",
695 __func__
, authctxt
->service
, authctxt
->style
);
697 if (strlen(authctxt
->style
) == 0) {
698 xfree(authctxt
->style
);
699 authctxt
->style
= NULL
;
706 mm_answer_authpassword(int sock
, Buffer
*m
)
708 static int call_count
;
713 passwd
= buffer_get_string(m
, &plen
);
714 /* Only authenticate if the context is valid */
715 authenticated
= options
.password_authentication
&&
716 auth_password(authctxt
, passwd
);
717 memset(passwd
, 0, strlen(passwd
));
721 buffer_put_int(m
, authenticated
);
723 debug3("%s: sending result %d", __func__
, authenticated
);
724 mm_request_send(sock
, MONITOR_ANS_AUTHPASSWORD
, m
);
727 if (plen
== 0 && call_count
== 1)
728 auth_method
= "none";
730 auth_method
= "password";
732 /* Causes monitor loop to terminate if authenticated */
733 return (authenticated
);
738 mm_answer_bsdauthquery(int sock
, Buffer
*m
)
740 char *name
, *infotxt
;
746 success
= bsdauth_query(authctxt
, &name
, &infotxt
, &numprompts
,
747 &prompts
, &echo_on
) < 0 ? 0 : 1;
750 buffer_put_int(m
, success
);
752 buffer_put_cstring(m
, prompts
[0]);
754 debug3("%s: sending challenge success: %u", __func__
, success
);
755 mm_request_send(sock
, MONITOR_ANS_BSDAUTHQUERY
, m
);
768 mm_answer_bsdauthrespond(int sock
, Buffer
*m
)
773 if (authctxt
->as
== 0)
774 fatal("%s: no bsd auth session", __func__
);
776 response
= buffer_get_string(m
, NULL
);
777 authok
= options
.challenge_response_authentication
&&
778 auth_userresponse(authctxt
->as
, response
, 0);
780 debug3("%s: <%s> = <%d>", __func__
, response
, authok
);
784 buffer_put_int(m
, authok
);
786 debug3("%s: sending authenticated: %d", __func__
, authok
);
787 mm_request_send(sock
, MONITOR_ANS_BSDAUTHRESPOND
, m
);
789 auth_method
= "bsdauth";
791 return (authok
!= 0);
797 mm_answer_skeyquery(int sock
, Buffer
*m
)
800 char challenge
[1024];
803 success
= _compat_skeychallenge(&skey
, authctxt
->user
, challenge
,
804 sizeof(challenge
)) < 0 ? 0 : 1;
807 buffer_put_int(m
, success
);
809 buffer_put_cstring(m
, challenge
);
811 debug3("%s: sending challenge success: %u", __func__
, success
);
812 mm_request_send(sock
, MONITOR_ANS_SKEYQUERY
, m
);
818 mm_answer_skeyrespond(int sock
, Buffer
*m
)
823 response
= buffer_get_string(m
, NULL
);
825 authok
= (options
.challenge_response_authentication
&&
827 skey_haskey(authctxt
->pw
->pw_name
) == 0 &&
828 skey_passcheck(authctxt
->pw
->pw_name
, response
) != -1);
833 buffer_put_int(m
, authok
);
835 debug3("%s: sending authenticated: %d", __func__
, authok
);
836 mm_request_send(sock
, MONITOR_ANS_SKEYRESPOND
, m
);
838 auth_method
= "skey";
840 return (authok
!= 0);
846 mm_answer_pam_start(int sock
, Buffer
*m
)
848 if (!options
.use_pam
)
849 fatal("UsePAM not set, but ended up in %s anyway", __func__
);
853 monitor_permit(mon_dispatch
, MONITOR_REQ_PAM_ACCOUNT
, 1);
859 mm_answer_pam_account(int sock
, Buffer
*m
)
863 if (!options
.use_pam
)
864 fatal("UsePAM not set, but ended up in %s anyway", __func__
);
866 ret
= do_pam_account();
868 buffer_put_int(m
, ret
);
869 buffer_put_string(m
, buffer_ptr(&loginmsg
), buffer_len(&loginmsg
));
871 mm_request_send(sock
, MONITOR_ANS_PAM_ACCOUNT
, m
);
876 static void *sshpam_ctxt
, *sshpam_authok
;
877 extern KbdintDevice sshpam_device
;
880 mm_answer_pam_init_ctx(int sock
, Buffer
*m
)
883 debug3("%s", __func__
);
884 authctxt
->user
= buffer_get_string(m
, NULL
);
885 sshpam_ctxt
= (sshpam_device
.init_ctx
)(authctxt
);
886 sshpam_authok
= NULL
;
888 if (sshpam_ctxt
!= NULL
) {
889 monitor_permit(mon_dispatch
, MONITOR_REQ_PAM_FREE_CTX
, 1);
890 buffer_put_int(m
, 1);
892 buffer_put_int(m
, 0);
894 mm_request_send(sock
, MONITOR_ANS_PAM_INIT_CTX
, m
);
899 mm_answer_pam_query(int sock
, Buffer
*m
)
901 char *name
, *info
, **prompts
;
902 u_int i
, num
, *echo_on
;
905 debug3("%s", __func__
);
906 sshpam_authok
= NULL
;
907 ret
= (sshpam_device
.query
)(sshpam_ctxt
, &name
, &info
, &num
, &prompts
, &echo_on
);
908 if (ret
== 0 && num
== 0)
909 sshpam_authok
= sshpam_ctxt
;
910 if (num
> 1 || name
== NULL
|| info
== NULL
)
913 buffer_put_int(m
, ret
);
914 buffer_put_cstring(m
, name
);
916 buffer_put_cstring(m
, info
);
918 buffer_put_int(m
, num
);
919 for (i
= 0; i
< num
; ++i
) {
920 buffer_put_cstring(m
, prompts
[i
]);
922 buffer_put_int(m
, echo_on
[i
]);
928 auth_method
= "keyboard-interactive/pam";
929 mm_request_send(sock
, MONITOR_ANS_PAM_QUERY
, m
);
934 mm_answer_pam_respond(int sock
, Buffer
*m
)
940 debug3("%s", __func__
);
941 sshpam_authok
= NULL
;
942 num
= buffer_get_int(m
);
944 resp
= xcalloc(num
, sizeof(char *));
945 for (i
= 0; i
< num
; ++i
)
946 resp
[i
] = buffer_get_string(m
, NULL
);
947 ret
= (sshpam_device
.respond
)(sshpam_ctxt
, num
, resp
);
948 for (i
= 0; i
< num
; ++i
)
952 ret
= (sshpam_device
.respond
)(sshpam_ctxt
, num
, NULL
);
955 buffer_put_int(m
, ret
);
956 mm_request_send(sock
, MONITOR_ANS_PAM_RESPOND
, m
);
957 auth_method
= "keyboard-interactive/pam";
959 sshpam_authok
= sshpam_ctxt
;
964 mm_answer_pam_free_ctx(int sock
, Buffer
*m
)
967 debug3("%s", __func__
);
968 (sshpam_device
.free_ctx
)(sshpam_ctxt
);
970 mm_request_send(sock
, MONITOR_ANS_PAM_FREE_CTX
, m
);
971 auth_method
= "keyboard-interactive/pam";
972 return (sshpam_authok
== sshpam_ctxt
);
977 mm_append_debug(Buffer
*m
)
979 if (auth_debug_init
&& buffer_len(&auth_debug
)) {
980 debug3("%s: Appending debug messages for child", __func__
);
981 buffer_append(m
, buffer_ptr(&auth_debug
),
982 buffer_len(&auth_debug
));
983 buffer_clear(&auth_debug
);
988 mm_answer_keyallowed(int sock
, Buffer
*m
)
994 enum mm_keytype type
= 0;
997 debug3("%s entering", __func__
);
999 type
= buffer_get_int(m
);
1000 cuser
= buffer_get_string(m
, NULL
);
1001 chost
= buffer_get_string(m
, NULL
);
1002 blob
= buffer_get_string(m
, &bloblen
);
1004 key
= key_from_blob(blob
, bloblen
);
1006 if ((compat20
&& type
== MM_RSAHOSTKEY
) ||
1007 (!compat20
&& type
!= MM_RSAHOSTKEY
))
1008 fatal("%s: key type and protocol mismatch", __func__
);
1010 debug3("%s: key_from_blob: %p", __func__
, key
);
1012 if (key
!= NULL
&& authctxt
->valid
) {
1015 allowed
= options
.pubkey_authentication
&&
1016 user_key_allowed(authctxt
->pw
, key
);
1017 auth_method
= "publickey";
1018 if (options
.pubkey_authentication
&& allowed
!= 1)
1019 auth_clear_options();
1022 allowed
= options
.hostbased_authentication
&&
1023 hostbased_key_allowed(authctxt
->pw
,
1025 auth_method
= "hostbased";
1028 key
->type
= KEY_RSA1
; /* XXX */
1029 allowed
= options
.rhosts_rsa_authentication
&&
1030 auth_rhosts_rsa_key_allowed(authctxt
->pw
,
1032 if (options
.rhosts_rsa_authentication
&& allowed
!= 1)
1033 auth_clear_options();
1034 auth_method
= "rsa";
1037 fatal("%s: unknown key type %d", __func__
, type
);
1044 /* clear temporarily storage (used by verify) */
1045 monitor_reset_key_state();
1048 /* Save temporarily for comparison in verify */
1050 key_bloblen
= bloblen
;
1051 key_blobtype
= type
;
1052 hostbased_cuser
= cuser
;
1053 hostbased_chost
= chost
;
1055 /* Log failed attempt */
1056 auth_log(authctxt
, 0, auth_method
, compat20
? " ssh2" : "");
1062 debug3("%s: key %p is %s",
1063 __func__
, key
, allowed
? "allowed" : "not allowed");
1066 buffer_put_int(m
, allowed
);
1067 buffer_put_int(m
, forced_command
!= NULL
);
1071 mm_request_send(sock
, MONITOR_ANS_KEYALLOWED
, m
);
1073 if (type
== MM_RSAHOSTKEY
)
1074 monitor_permit(mon_dispatch
, MONITOR_REQ_RSACHALLENGE
, allowed
);
1080 monitor_valid_userblob(u_char
*data
, u_int datalen
)
1088 buffer_append(&b
, data
, datalen
);
1090 if (datafellows
& SSH_OLD_SESSIONID
) {
1092 len
= buffer_len(&b
);
1093 if ((session_id2
== NULL
) ||
1094 (len
< session_id2_len
) ||
1095 (memcmp(p
, session_id2
, session_id2_len
) != 0))
1097 buffer_consume(&b
, session_id2_len
);
1099 p
= buffer_get_string(&b
, &len
);
1100 if ((session_id2
== NULL
) ||
1101 (len
!= session_id2_len
) ||
1102 (memcmp(p
, session_id2
, session_id2_len
) != 0))
1106 if (buffer_get_char(&b
) != SSH2_MSG_USERAUTH_REQUEST
)
1108 p
= buffer_get_string(&b
, NULL
);
1109 if (strcmp(authctxt
->user
, p
) != 0) {
1110 logit("wrong user name passed to monitor: expected %s != %.100s",
1115 buffer_skip_string(&b
);
1116 if (datafellows
& SSH_BUG_PKAUTH
) {
1117 if (!buffer_get_char(&b
))
1120 p
= buffer_get_string(&b
, NULL
);
1121 if (strcmp("publickey", p
) != 0)
1124 if (!buffer_get_char(&b
))
1126 buffer_skip_string(&b
);
1128 buffer_skip_string(&b
);
1129 if (buffer_len(&b
) != 0)
1136 monitor_valid_hostbasedblob(u_char
*data
, u_int datalen
, char *cuser
,
1145 buffer_append(&b
, data
, datalen
);
1147 p
= buffer_get_string(&b
, &len
);
1148 if ((session_id2
== NULL
) ||
1149 (len
!= session_id2_len
) ||
1150 (memcmp(p
, session_id2
, session_id2_len
) != 0))
1154 if (buffer_get_char(&b
) != SSH2_MSG_USERAUTH_REQUEST
)
1156 p
= buffer_get_string(&b
, NULL
);
1157 if (strcmp(authctxt
->user
, p
) != 0) {
1158 logit("wrong user name passed to monitor: expected %s != %.100s",
1163 buffer_skip_string(&b
); /* service */
1164 p
= buffer_get_string(&b
, NULL
);
1165 if (strcmp(p
, "hostbased") != 0)
1168 buffer_skip_string(&b
); /* pkalg */
1169 buffer_skip_string(&b
); /* pkblob */
1171 /* verify client host, strip trailing dot if necessary */
1172 p
= buffer_get_string(&b
, NULL
);
1173 if (((len
= strlen(p
)) > 0) && p
[len
- 1] == '.')
1175 if (strcmp(p
, chost
) != 0)
1179 /* verify client user */
1180 p
= buffer_get_string(&b
, NULL
);
1181 if (strcmp(p
, cuser
) != 0)
1185 if (buffer_len(&b
) != 0)
1192 mm_answer_keyverify(int sock
, Buffer
*m
)
1195 u_char
*signature
, *data
, *blob
;
1196 u_int signaturelen
, datalen
, bloblen
;
1200 blob
= buffer_get_string(m
, &bloblen
);
1201 signature
= buffer_get_string(m
, &signaturelen
);
1202 data
= buffer_get_string(m
, &datalen
);
1204 if (hostbased_cuser
== NULL
|| hostbased_chost
== NULL
||
1205 !monitor_allowed_key(blob
, bloblen
))
1206 fatal("%s: bad key, not previously allowed", __func__
);
1208 key
= key_from_blob(blob
, bloblen
);
1210 fatal("%s: bad public key blob", __func__
);
1212 switch (key_blobtype
) {
1214 valid_data
= monitor_valid_userblob(data
, datalen
);
1217 valid_data
= monitor_valid_hostbasedblob(data
, datalen
,
1218 hostbased_cuser
, hostbased_chost
);
1225 fatal("%s: bad signature data blob", __func__
);
1227 verified
= key_verify(key
, signature
, signaturelen
, data
, datalen
);
1228 debug3("%s: key %p signature %s",
1229 __func__
, key
, (verified
== 1) ? "verified" : "unverified");
1236 auth_method
= key_blobtype
== MM_USERKEY
? "publickey" : "hostbased";
1238 monitor_reset_key_state();
1241 buffer_put_int(m
, verified
);
1242 mm_request_send(sock
, MONITOR_ANS_KEYVERIFY
, m
);
1244 return (verified
== 1);
1248 mm_record_login(Session
*s
, struct passwd
*pw
)
1251 struct sockaddr_storage from
;
1254 * Get IP address of client. If the connection is not a socket, let
1255 * the address be 0.0.0.0.
1257 memset(&from
, 0, sizeof(from
));
1258 fromlen
= sizeof(from
);
1259 if (packet_connection_is_on_socket()) {
1260 if (getpeername(packet_get_connection_in(),
1261 (struct sockaddr
*)&from
, &fromlen
) < 0) {
1262 debug("getpeername: %.100s", strerror(errno
));
1266 /* Record that there was a login on that tty from the remote host. */
1267 record_login(s
->pid
, s
->tty
, pw
->pw_name
, pw
->pw_uid
,
1268 get_remote_name_or_ip(utmp_len
, options
.use_dns
),
1269 (struct sockaddr
*)&from
, fromlen
);
1273 mm_session_close(Session
*s
)
1275 debug3("%s: session %d pid %ld", __func__
, s
->self
, (long)s
->pid
);
1276 if (s
->ttyfd
!= -1) {
1277 debug3("%s: tty %s ptyfd %d", __func__
, s
->tty
, s
->ptyfd
);
1278 session_pty_cleanup2(s
);
1280 session_unused(s
->self
);
1284 mm_answer_pty(int sock
, Buffer
*m
)
1286 extern struct monitor
*pmonitor
;
1290 debug3("%s entering", __func__
);
1296 s
->authctxt
= authctxt
;
1297 s
->pw
= authctxt
->pw
;
1298 s
->pid
= pmonitor
->m_pid
;
1299 res
= pty_allocate(&s
->ptyfd
, &s
->ttyfd
, s
->tty
, sizeof(s
->tty
));
1302 pty_setowner(authctxt
->pw
, s
->tty
);
1304 buffer_put_int(m
, 1);
1305 buffer_put_cstring(m
, s
->tty
);
1307 /* We need to trick ttyslot */
1308 if (dup2(s
->ttyfd
, 0) == -1)
1309 fatal("%s: dup2", __func__
);
1311 mm_record_login(s
, authctxt
->pw
);
1313 /* Now we can close the file descriptor again */
1316 /* send messages generated by record_login */
1317 buffer_put_string(m
, buffer_ptr(&loginmsg
), buffer_len(&loginmsg
));
1318 buffer_clear(&loginmsg
);
1320 mm_request_send(sock
, MONITOR_ANS_PTY
, m
);
1322 if (mm_send_fd(sock
, s
->ptyfd
) == -1 ||
1323 mm_send_fd(sock
, s
->ttyfd
) == -1)
1324 fatal("%s: send fds failed", __func__
);
1326 /* make sure nothing uses fd 0 */
1327 if ((fd0
= open(_PATH_DEVNULL
, O_RDONLY
)) < 0)
1328 fatal("%s: open(/dev/null): %s", __func__
, strerror(errno
));
1330 error("%s: fd0 %d != 0", __func__
, fd0
);
1332 /* slave is not needed */
1334 s
->ttyfd
= s
->ptyfd
;
1335 /* no need to dup() because nobody closes ptyfd */
1336 s
->ptymaster
= s
->ptyfd
;
1338 debug3("%s: tty %s ptyfd %d", __func__
, s
->tty
, s
->ttyfd
);
1344 mm_session_close(s
);
1345 buffer_put_int(m
, 0);
1346 mm_request_send(sock
, MONITOR_ANS_PTY
, m
);
1351 mm_answer_pty_cleanup(int sock
, Buffer
*m
)
1356 debug3("%s entering", __func__
);
1358 tty
= buffer_get_string(m
, NULL
);
1359 if ((s
= session_by_tty(tty
)) != NULL
)
1360 mm_session_close(s
);
1367 mm_answer_sesskey(int sock
, Buffer
*m
)
1372 /* Turn off permissions */
1373 monitor_permit(mon_dispatch
, MONITOR_REQ_SESSKEY
, 0);
1375 if ((p
= BN_new()) == NULL
)
1376 fatal("%s: BN_new", __func__
);
1378 buffer_get_bignum2(m
, p
);
1380 rsafail
= ssh1_session_key(p
);
1383 buffer_put_int(m
, rsafail
);
1384 buffer_put_bignum2(m
, p
);
1388 mm_request_send(sock
, MONITOR_ANS_SESSKEY
, m
);
1390 /* Turn on permissions for sessid passing */
1391 monitor_permit(mon_dispatch
, MONITOR_REQ_SESSID
, 1);
1397 mm_answer_sessid(int sock
, Buffer
*m
)
1401 debug3("%s entering", __func__
);
1403 if (buffer_len(m
) != 16)
1404 fatal("%s: bad ssh1 session id", __func__
);
1405 for (i
= 0; i
< 16; i
++)
1406 session_id
[i
] = buffer_get_char(m
);
1408 /* Turn on permissions for getpwnam */
1409 monitor_permit(mon_dispatch
, MONITOR_REQ_PWNAM
, 1);
1415 mm_answer_rsa_keyallowed(int sock
, Buffer
*m
)
1419 u_char
*blob
= NULL
;
1423 debug3("%s entering", __func__
);
1425 auth_method
= "rsa";
1426 if (options
.rsa_authentication
&& authctxt
->valid
) {
1427 if ((client_n
= BN_new()) == NULL
)
1428 fatal("%s: BN_new", __func__
);
1429 buffer_get_bignum2(m
, client_n
);
1430 allowed
= auth_rsa_key_allowed(authctxt
->pw
, client_n
, &key
);
1431 BN_clear_free(client_n
);
1434 buffer_put_int(m
, allowed
);
1435 buffer_put_int(m
, forced_command
!= NULL
);
1437 /* clear temporarily storage (used by generate challenge) */
1438 monitor_reset_key_state();
1440 if (allowed
&& key
!= NULL
) {
1441 key
->type
= KEY_RSA
; /* cheat for key_to_blob */
1442 if (key_to_blob(key
, &blob
, &blen
) == 0)
1443 fatal("%s: key_to_blob failed", __func__
);
1444 buffer_put_string(m
, blob
, blen
);
1446 /* Save temporarily for comparison in verify */
1449 key_blobtype
= MM_RSAUSERKEY
;
1456 mm_request_send(sock
, MONITOR_ANS_RSAKEYALLOWED
, m
);
1458 monitor_permit(mon_dispatch
, MONITOR_REQ_RSACHALLENGE
, allowed
);
1459 monitor_permit(mon_dispatch
, MONITOR_REQ_RSARESPONSE
, 0);
1464 mm_answer_rsa_challenge(int sock
, Buffer
*m
)
1470 debug3("%s entering", __func__
);
1472 if (!authctxt
->valid
)
1473 fatal("%s: authctxt not valid", __func__
);
1474 blob
= buffer_get_string(m
, &blen
);
1475 if (!monitor_allowed_key(blob
, blen
))
1476 fatal("%s: bad key, not previously allowed", __func__
);
1477 if (key_blobtype
!= MM_RSAUSERKEY
&& key_blobtype
!= MM_RSAHOSTKEY
)
1478 fatal("%s: key type mismatch", __func__
);
1479 if ((key
= key_from_blob(blob
, blen
)) == NULL
)
1480 fatal("%s: received bad key", __func__
);
1483 BN_clear_free(ssh1_challenge
);
1484 ssh1_challenge
= auth_rsa_generate_challenge(key
);
1487 buffer_put_bignum2(m
, ssh1_challenge
);
1489 debug3("%s sending reply", __func__
);
1490 mm_request_send(sock
, MONITOR_ANS_RSACHALLENGE
, m
);
1492 monitor_permit(mon_dispatch
, MONITOR_REQ_RSARESPONSE
, 1);
1500 mm_answer_rsa_response(int sock
, Buffer
*m
)
1503 u_char
*blob
, *response
;
1507 debug3("%s entering", __func__
);
1509 if (!authctxt
->valid
)
1510 fatal("%s: authctxt not valid", __func__
);
1511 if (ssh1_challenge
== NULL
)
1512 fatal("%s: no ssh1_challenge", __func__
);
1514 blob
= buffer_get_string(m
, &blen
);
1515 if (!monitor_allowed_key(blob
, blen
))
1516 fatal("%s: bad key, not previously allowed", __func__
);
1517 if (key_blobtype
!= MM_RSAUSERKEY
&& key_blobtype
!= MM_RSAHOSTKEY
)
1518 fatal("%s: key type mismatch: %d", __func__
, key_blobtype
);
1519 if ((key
= key_from_blob(blob
, blen
)) == NULL
)
1520 fatal("%s: received bad key", __func__
);
1521 response
= buffer_get_string(m
, &len
);
1523 fatal("%s: received bad response to challenge", __func__
);
1524 success
= auth_rsa_verify_response(key
, ssh1_challenge
, response
);
1530 auth_method
= key_blobtype
== MM_RSAUSERKEY
? "rsa" : "rhosts-rsa";
1533 BN_clear_free(ssh1_challenge
);
1534 ssh1_challenge
= NULL
;
1535 monitor_reset_key_state();
1538 buffer_put_int(m
, success
);
1539 mm_request_send(sock
, MONITOR_ANS_RSARESPONSE
, m
);
1545 mm_answer_term(int sock
, Buffer
*req
)
1547 extern struct monitor
*pmonitor
;
1550 debug3("%s: tearing down sessions", __func__
);
1552 /* The child is terminating */
1553 session_destroy_all(&mm_session_close
);
1556 if (options
.use_pam
)
1560 while (waitpid(pmonitor
->m_pid
, &status
, 0) == -1)
1564 res
= WIFEXITED(status
) ? WEXITSTATUS(status
) : 1;
1566 /* Terminate process */
1570 #ifdef SSH_AUDIT_EVENTS
1571 /* Report that an audit event occurred */
1573 mm_answer_audit_event(int socket
, Buffer
*m
)
1575 ssh_audit_event_t event
;
1577 debug3("%s entering", __func__
);
1579 event
= buffer_get_int(m
);
1581 case SSH_AUTH_FAIL_PUBKEY
:
1582 case SSH_AUTH_FAIL_HOSTBASED
:
1583 case SSH_AUTH_FAIL_GSSAPI
:
1584 case SSH_LOGIN_EXCEED_MAXTRIES
:
1585 case SSH_LOGIN_ROOT_DENIED
:
1586 case SSH_CONNECTION_CLOSE
:
1587 case SSH_INVALID_USER
:
1591 fatal("Audit event type %d not permitted", event
);
1598 mm_answer_audit_command(int socket
, Buffer
*m
)
1603 debug3("%s entering", __func__
);
1604 cmd
= buffer_get_string(m
, &len
);
1605 /* sanity check command, if so how? */
1606 audit_run_command(cmd
);
1610 #endif /* SSH_AUDIT_EVENTS */
1613 monitor_apply_keystate(struct monitor
*pmonitor
)
1616 set_newkeys(MODE_IN
);
1617 set_newkeys(MODE_OUT
);
1619 packet_set_protocol_flags(child_state
.ssh1protoflags
);
1620 packet_set_encryption_key(child_state
.ssh1key
,
1621 child_state
.ssh1keylen
, child_state
.ssh1cipher
);
1622 xfree(child_state
.ssh1key
);
1625 /* for rc4 and other stateful ciphers */
1626 packet_set_keycontext(MODE_OUT
, child_state
.keyout
);
1627 xfree(child_state
.keyout
);
1628 packet_set_keycontext(MODE_IN
, child_state
.keyin
);
1629 xfree(child_state
.keyin
);
1632 packet_set_iv(MODE_OUT
, child_state
.ivout
);
1633 xfree(child_state
.ivout
);
1634 packet_set_iv(MODE_IN
, child_state
.ivin
);
1635 xfree(child_state
.ivin
);
1638 memcpy(&incoming_stream
, &child_state
.incoming
,
1639 sizeof(incoming_stream
));
1640 memcpy(&outgoing_stream
, &child_state
.outgoing
,
1641 sizeof(outgoing_stream
));
1643 /* Update with new address */
1644 if (options
.compression
)
1645 mm_init_compression(pmonitor
->m_zlib
);
1647 /* Network I/O buffers */
1648 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1649 buffer_clear(&input
);
1650 buffer_append(&input
, child_state
.input
, child_state
.ilen
);
1651 memset(child_state
.input
, 0, child_state
.ilen
);
1652 xfree(child_state
.input
);
1654 buffer_clear(&output
);
1655 buffer_append(&output
, child_state
.output
, child_state
.olen
);
1656 memset(child_state
.output
, 0, child_state
.olen
);
1657 xfree(child_state
.output
);
1661 mm_get_kex(Buffer
*m
)
1667 kex
= xcalloc(1, sizeof(*kex
));
1668 kex
->session_id
= buffer_get_string(m
, &kex
->session_id_len
);
1669 if ((session_id2
== NULL
) ||
1670 (kex
->session_id_len
!= session_id2_len
) ||
1671 (memcmp(kex
->session_id
, session_id2
, session_id2_len
) != 0))
1672 fatal("mm_get_get: internal error: bad session id");
1673 kex
->we_need
= buffer_get_int(m
);
1674 kex
->kex
[KEX_DH_GRP1_SHA1
] = kexdh_server
;
1675 kex
->kex
[KEX_DH_GRP14_SHA1
] = kexdh_server
;
1676 kex
->kex
[KEX_DH_GEX_SHA1
] = kexgex_server
;
1677 kex
->kex
[KEX_DH_GEX_SHA256
] = kexgex_server
;
1679 kex
->hostkey_type
= buffer_get_int(m
);
1680 kex
->kex_type
= buffer_get_int(m
);
1681 blob
= buffer_get_string(m
, &bloblen
);
1682 buffer_init(&kex
->my
);
1683 buffer_append(&kex
->my
, blob
, bloblen
);
1685 blob
= buffer_get_string(m
, &bloblen
);
1686 buffer_init(&kex
->peer
);
1687 buffer_append(&kex
->peer
, blob
, bloblen
);
1690 kex
->flags
= buffer_get_int(m
);
1691 kex
->client_version_string
= buffer_get_string(m
, NULL
);
1692 kex
->server_version_string
= buffer_get_string(m
, NULL
);
1693 kex
->load_host_key
=&get_hostkey_by_type
;
1694 kex
->host_key_index
=&get_hostkey_index
;
1699 /* This function requries careful sanity checking */
1702 mm_get_keystate(struct monitor
*pmonitor
)
1706 u_int bloblen
, plen
;
1707 u_int32_t seqnr
, packets
;
1708 u_int64_t blocks
, bytes
;
1710 debug3("%s: Waiting for new keys", __func__
);
1713 mm_request_receive_expect(pmonitor
->m_sendfd
, MONITOR_REQ_KEYEXPORT
, &m
);
1715 child_state
.ssh1protoflags
= buffer_get_int(&m
);
1716 child_state
.ssh1cipher
= buffer_get_int(&m
);
1717 child_state
.ssh1key
= buffer_get_string(&m
,
1718 &child_state
.ssh1keylen
);
1719 child_state
.ivout
= buffer_get_string(&m
,
1720 &child_state
.ivoutlen
);
1721 child_state
.ivin
= buffer_get_string(&m
, &child_state
.ivinlen
);
1724 /* Get the Kex for rekeying */
1725 *pmonitor
->m_pkex
= mm_get_kex(&m
);
1728 blob
= buffer_get_string(&m
, &bloblen
);
1729 current_keys
[MODE_OUT
] = mm_newkeys_from_blob(blob
, bloblen
);
1732 debug3("%s: Waiting for second key", __func__
);
1733 blob
= buffer_get_string(&m
, &bloblen
);
1734 current_keys
[MODE_IN
] = mm_newkeys_from_blob(blob
, bloblen
);
1737 /* Now get sequence numbers for the packets */
1738 seqnr
= buffer_get_int(&m
);
1739 blocks
= buffer_get_int64(&m
);
1740 packets
= buffer_get_int(&m
);
1741 bytes
= buffer_get_int64(&m
);
1742 packet_set_state(MODE_OUT
, seqnr
, blocks
, packets
, bytes
);
1743 seqnr
= buffer_get_int(&m
);
1744 blocks
= buffer_get_int64(&m
);
1745 packets
= buffer_get_int(&m
);
1746 bytes
= buffer_get_int64(&m
);
1747 packet_set_state(MODE_IN
, seqnr
, blocks
, packets
, bytes
);
1750 /* Get the key context */
1751 child_state
.keyout
= buffer_get_string(&m
, &child_state
.keyoutlen
);
1752 child_state
.keyin
= buffer_get_string(&m
, &child_state
.keyinlen
);
1754 debug3("%s: Getting compression state", __func__
);
1755 /* Get compression state */
1756 p
= buffer_get_string(&m
, &plen
);
1757 if (plen
!= sizeof(child_state
.outgoing
))
1758 fatal("%s: bad request size", __func__
);
1759 memcpy(&child_state
.outgoing
, p
, sizeof(child_state
.outgoing
));
1762 p
= buffer_get_string(&m
, &plen
);
1763 if (plen
!= sizeof(child_state
.incoming
))
1764 fatal("%s: bad request size", __func__
);
1765 memcpy(&child_state
.incoming
, p
, sizeof(child_state
.incoming
));
1768 /* Network I/O buffers */
1769 debug3("%s: Getting Network I/O buffers", __func__
);
1770 child_state
.input
= buffer_get_string(&m
, &child_state
.ilen
);
1771 child_state
.output
= buffer_get_string(&m
, &child_state
.olen
);
1777 /* Allocation functions for zlib */
1779 mm_zalloc(struct mm_master
*mm
, u_int ncount
, u_int size
)
1781 size_t len
= (size_t) size
* ncount
;
1784 if (len
== 0 || ncount
> SIZE_T_MAX
/ size
)
1785 fatal("%s: mm_zalloc(%u, %u)", __func__
, ncount
, size
);
1787 address
= mm_malloc(mm
, len
);
1793 mm_zfree(struct mm_master
*mm
, void *address
)
1795 mm_free(mm
, address
);
1799 mm_init_compression(struct mm_master
*mm
)
1801 outgoing_stream
.zalloc
= (alloc_func
)mm_zalloc
;
1802 outgoing_stream
.zfree
= (free_func
)mm_zfree
;
1803 outgoing_stream
.opaque
= mm
;
1805 incoming_stream
.zalloc
= (alloc_func
)mm_zalloc
;
1806 incoming_stream
.zfree
= (free_func
)mm_zfree
;
1807 incoming_stream
.opaque
= mm
;
1812 #define FD_CLOSEONEXEC(x) do { \
1813 if (fcntl(x, F_SETFD, 1) == -1) \
1814 fatal("fcntl(%d, F_SETFD)", x); \
1818 monitor_socketpair(int *pair
)
1820 #ifdef HAVE_SOCKETPAIR
1821 if (socketpair(AF_UNIX
, SOCK_STREAM
, 0, pair
) == -1)
1822 fatal("%s: socketpair", __func__
);
1824 fatal("%s: UsePrivilegeSeparation=yes not supported",
1827 FD_CLOSEONEXEC(pair
[0]);
1828 FD_CLOSEONEXEC(pair
[1]);
1831 #define MM_MEMSIZE 65536
1836 struct monitor
*mon
;
1839 mon
= xcalloc(1, sizeof(*mon
));
1841 monitor_socketpair(pair
);
1843 mon
->m_recvfd
= pair
[0];
1844 mon
->m_sendfd
= pair
[1];
1846 /* Used to share zlib space across processes */
1847 if (options
.compression
) {
1848 mon
->m_zback
= mm_create(NULL
, MM_MEMSIZE
);
1849 mon
->m_zlib
= mm_create(mon
->m_zback
, 20 * MM_MEMSIZE
);
1851 /* Compression needs to share state across borders */
1852 mm_init_compression(mon
->m_zlib
);
1859 monitor_reinit(struct monitor
*mon
)
1863 monitor_socketpair(pair
);
1865 mon
->m_recvfd
= pair
[0];
1866 mon
->m_sendfd
= pair
[1];
1871 mm_answer_gss_setup_ctx(int sock
, Buffer
*m
)
1877 goid
.elements
= buffer_get_string(m
, &len
);
1880 major
= ssh_gssapi_server_ctx(&gsscontext
, &goid
);
1882 xfree(goid
.elements
);
1885 buffer_put_int(m
, major
);
1887 mm_request_send(sock
, MONITOR_ANS_GSSSETUP
, m
);
1889 /* Now we have a context, enable the step */
1890 monitor_permit(mon_dispatch
, MONITOR_REQ_GSSSTEP
, 1);
1896 mm_answer_gss_accept_ctx(int sock
, Buffer
*m
)
1899 gss_buffer_desc out
= GSS_C_EMPTY_BUFFER
;
1900 OM_uint32 major
, minor
;
1901 OM_uint32 flags
= 0; /* GSI needs this */
1904 in
.value
= buffer_get_string(m
, &len
);
1906 major
= ssh_gssapi_accept_ctx(gsscontext
, &in
, &out
, &flags
);
1910 buffer_put_int(m
, major
);
1911 buffer_put_string(m
, out
.value
, out
.length
);
1912 buffer_put_int(m
, flags
);
1913 mm_request_send(sock
, MONITOR_ANS_GSSSTEP
, m
);
1915 gss_release_buffer(&minor
, &out
);
1917 if (major
== GSS_S_COMPLETE
) {
1918 monitor_permit(mon_dispatch
, MONITOR_REQ_GSSSTEP
, 0);
1919 monitor_permit(mon_dispatch
, MONITOR_REQ_GSSUSEROK
, 1);
1920 monitor_permit(mon_dispatch
, MONITOR_REQ_GSSCHECKMIC
, 1);
1926 mm_answer_gss_checkmic(int sock
, Buffer
*m
)
1928 gss_buffer_desc gssbuf
, mic
;
1932 gssbuf
.value
= buffer_get_string(m
, &len
);
1933 gssbuf
.length
= len
;
1934 mic
.value
= buffer_get_string(m
, &len
);
1937 ret
= ssh_gssapi_checkmic(gsscontext
, &gssbuf
, &mic
);
1939 xfree(gssbuf
.value
);
1943 buffer_put_int(m
, ret
);
1945 mm_request_send(sock
, MONITOR_ANS_GSSCHECKMIC
, m
);
1947 if (!GSS_ERROR(ret
))
1948 monitor_permit(mon_dispatch
, MONITOR_REQ_GSSUSEROK
, 1);
1954 mm_answer_gss_userok(int sock
, Buffer
*m
)
1958 authenticated
= authctxt
->valid
&& ssh_gssapi_userok(authctxt
->user
);
1961 buffer_put_int(m
, authenticated
);
1963 debug3("%s: sending result %d", __func__
, authenticated
);
1964 mm_request_send(sock
, MONITOR_ANS_GSSUSEROK
, m
);
1966 auth_method
= "gssapi-with-mic";
1968 /* Monitor loop will terminate if authenticated */
1969 return (authenticated
);