]> andersk Git - openssh.git/blame - monitor.c
andersk / openssh.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
- (djm) Add --with-superuser-path=xxx configure option to specify what $PATH
[openssh.git] / monitor.c
CommitLineData
1853d1ef 1/*
2 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
3 * Copyright 2002 Markus Friedl <markus@openbsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "includes.h"
8c38e88b 28RCSID("$OpenBSD: monitor.c,v 1.9 2002/03/30 18:51:15 markus Exp $");
1853d1ef 29
30#include <openssl/dh.h>
31
32#ifdef SKEY
33#include <skey.h>
34#endif
35
36#include "ssh.h"
37#include "auth.h"
38#include "kex.h"
39#include "dh.h"
40#include "zlib.h"
41#include "packet.h"
42#include "auth-options.h"
43#include "sshpty.h"
44#include "channels.h"
45#include "session.h"
46#include "sshlogin.h"
47#include "canohost.h"
48#include "log.h"
49#include "servconf.h"
50#include "monitor.h"
51#include "monitor_mm.h"
52#include "monitor_wrap.h"
53#include "monitor_fdpass.h"
54#include "xmalloc.h"
55#include "misc.h"
56#include "buffer.h"
57#include "bufaux.h"
58#include "compat.h"
59#include "ssh2.h"
60#include "mpaux.h"
61
62/* Imports */
63extern ServerOptions options;
64extern u_int utmp_len;
65extern Newkeys *current_keys[];
66extern z_stream incoming_stream;
67extern z_stream outgoing_stream;
68extern u_char session_id[];
69extern Buffer input, output;
70extern Buffer auth_debug;
71extern int auth_debug_init;
72
73/* State exported from the child */
74
75struct {
76 z_stream incoming;
77 z_stream outgoing;
78 u_char *keyin;
79 u_int keyinlen;
80 u_char *keyout;
81 u_int keyoutlen;
82 u_char *ivin;
83 u_int ivinlen;
84 u_char *ivout;
85 u_int ivoutlen;
86 int ssh1cipher;
87 int ssh1protoflags;
88 u_char *input;
89 u_int ilen;
90 u_char *output;
91 u_int olen;
92} child_state;
93
94/* Functions on the montior that answer unprivileged requests */
95
96int mm_answer_moduli(int, Buffer *);
97int mm_answer_sign(int, Buffer *);
98int mm_answer_pwnamallow(int, Buffer *);
99int mm_answer_authserv(int, Buffer *);
100int mm_answer_authpassword(int, Buffer *);
101int mm_answer_bsdauthquery(int, Buffer *);
102int mm_answer_bsdauthrespond(int, Buffer *);
103int mm_answer_skeyquery(int, Buffer *);
104int mm_answer_skeyrespond(int, Buffer *);
105int mm_answer_keyallowed(int, Buffer *);
106int mm_answer_keyverify(int, Buffer *);
107int mm_answer_pty(int, Buffer *);
108int mm_answer_pty_cleanup(int, Buffer *);
109int mm_answer_term(int, Buffer *);
110int mm_answer_rsa_keyallowed(int, Buffer *);
111int mm_answer_rsa_challenge(int, Buffer *);
112int mm_answer_rsa_response(int, Buffer *);
113int mm_answer_sesskey(int, Buffer *);
114int mm_answer_sessid(int, Buffer *);
115
ad200abb 116#ifdef USE_PAM
117int mm_answer_pam_start(int, Buffer *);
118#endif
119
1853d1ef 120static Authctxt *authctxt;
121static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
122
123/* local state for key verify */
124static u_char *key_blob = NULL;
125static u_int key_bloblen = 0;
126static int key_blobtype = MM_NOKEY;
127static u_char *hostbased_cuser = NULL;
128static u_char *hostbased_chost = NULL;
129static char *auth_method = "unknown";
130
131struct mon_table {
132 enum monitor_reqtype type;
133 int flags;
134 int (*f)(int, Buffer *);
135};
136
137#define MON_ISAUTH 0x0004 /* Required for Authentication */
138#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
139#define MON_ONCE 0x0010 /* Disable after calling */
140
141#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
142
143#define MON_PERMIT 0x1000 /* Request is permitted */
144
145struct mon_table mon_dispatch_proto20[] = {
146 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
147 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
148 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
149 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
150 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
ad200abb 151#ifdef USE_PAM
152 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
8b314ec9 153#endif
1853d1ef 154#ifdef BSD_AUTH
155 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
156 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
157#endif
158#ifdef SKEY
159 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
160 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
161#endif
162 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
163 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
164 {0, 0, NULL}
165};
166
167struct mon_table mon_dispatch_postauth20[] = {
168 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
169 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
170 {MONITOR_REQ_PTY, 0, mm_answer_pty},
171 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
172 {MONITOR_REQ_TERM, 0, mm_answer_term},
173 {0, 0, NULL}
174};
175
176struct mon_table mon_dispatch_proto15[] = {
177 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
178 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
179 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
180 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
181 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
182 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
183 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
184 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
efe44db6 185#ifdef USE_PAM
186 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
187#endif
1853d1ef 188#ifdef BSD_AUTH
189 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
190 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
191#endif
192#ifdef SKEY
193 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
194 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
efe44db6 195#endif
196#ifdef USE_PAM
197 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
1853d1ef 198#endif
199 {0, 0, NULL}
200};
201
202struct mon_table mon_dispatch_postauth15[] = {
203 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
204 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
205 {MONITOR_REQ_TERM, 0, mm_answer_term},
206 {0, 0, NULL}
207};
208
209struct mon_table *mon_dispatch;
210
211/* Specifies if a certain message is allowed at the moment */
212
213static void
214monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
215{
216 while (ent->f != NULL) {
217 if (ent->type == type) {
218 ent->flags &= ~MON_PERMIT;
219 ent->flags |= permit ? MON_PERMIT : 0;
220 return;
221 }
222 ent++;
223 }
224}
225
226static void
227monitor_permit_authentications(int permit)
228{
229 struct mon_table *ent = mon_dispatch;
230
231 while (ent->f != NULL) {
232 if (ent->flags & MON_AUTH) {
233 ent->flags &= ~MON_PERMIT;
234 ent->flags |= permit ? MON_PERMIT : 0;
235 }
236 ent++;
237 }
238}
239
240Authctxt *
241monitor_child_preauth(struct monitor *monitor)
242{
243 struct mon_table *ent;
244 int authenticated = 0;
245
246 debug3("preauth child monitor started");
247
248 if (compat20) {
249 mon_dispatch = mon_dispatch_proto20;
250
251 /* Permit requests for moduli and signatures */
252 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
253 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
254 } else {
255 mon_dispatch = mon_dispatch_proto15;
256
257 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
258 }
259
260 authctxt = authctxt_new();
261
262 /* The first few requests do not require asynchronous access */
263 while (!authenticated) {
264 authenticated = monitor_read(monitor, mon_dispatch, &ent);
265 if (authenticated) {
266 if (!(ent->flags & MON_AUTHDECIDE))
267 fatal("%s: unexpected authentication from %d",
268 __FUNCTION__, ent->type);
269 if (authctxt->pw->pw_uid == 0 &&
270 !auth_root_allowed(auth_method))
271 authenticated = 0;
ad200abb 272#ifdef USE_PAM
273 if (!do_pam_account(authctxt->pw->pw_name, NULL))
274 authenticated = 0;
275#endif
1853d1ef 276 }
277
278 if (ent->flags & MON_AUTHDECIDE) {
279 auth_log(authctxt, authenticated, auth_method,
280 compat20 ? " ssh2" : "");
281 if (!authenticated)
282 authctxt->failures++;
283 }
284 }
285
286 if (!authctxt->valid)
287 fatal("%s: authenticated invalid user", __FUNCTION__);
288
289 debug("%s: %s has been authenticated by privileged process",
290 __FUNCTION__, authctxt->user);
291
292 mm_get_keystate(monitor);
293
294 return (authctxt);
295}
296
297void
298monitor_child_postauth(struct monitor *monitor)
299{
300 if (compat20) {
301 mon_dispatch = mon_dispatch_postauth20;
302
303 /* Permit requests for moduli and signatures */
304 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
305 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
306 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
307
308 } else {
309 mon_dispatch = mon_dispatch_postauth15;
310 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
311 }
312 if (!no_pty_flag) {
313 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
314 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
315 }
316
317 for (;;)
318 monitor_read(monitor, mon_dispatch, NULL);
319}
320
321void
322monitor_sync(struct monitor *monitor)
323{
324 /* The member allocation is not visible, so sync it */
325 mm_share_sync(&monitor->m_zlib, &monitor->m_zback);
326}
327
328int
329monitor_read(struct monitor *monitor, struct mon_table *ent,
330 struct mon_table **pent)
331{
332 Buffer m;
333 int ret;
334 u_char type;
335
336 buffer_init(&m);
337
338 mm_request_receive(monitor->m_sendfd, &m);
339 type = buffer_get_char(&m);
340
341 debug3("%s: checking request %d", __FUNCTION__, type);
342
343 while (ent->f != NULL) {
344 if (ent->type == type)
345 break;
346 ent++;
347 }
348
349 if (ent->f != NULL) {
350 if (!(ent->flags & MON_PERMIT))
351 fatal("%s: unpermitted request %d", __FUNCTION__,
352 type);
353 ret = (*ent->f)(monitor->m_sendfd, &m);
354 buffer_free(&m);
355
356 /* The child may use this request only once, disable it */
357 if (ent->flags & MON_ONCE) {
358 debug2("%s: %d used once, disabling now", __FUNCTION__,
359 type);
360 ent->flags &= ~MON_PERMIT;
361 }
362
363 if (pent != NULL)
364 *pent = ent;
365
366 return ret;
367 }
368
38c1c52a 369 fatal("%s: unsupported request: %d", __FUNCTION__, type);
1853d1ef 370
371 /* NOTREACHED */
372 return (-1);
373}
374
375/* allowed key state */
376static int
377monitor_allowed_key(u_char *blob, u_int bloblen)
378{
379 /* make sure key is allowed */
380 if (key_blob == NULL || key_bloblen != bloblen ||
381 memcmp(key_blob, blob, key_bloblen))
382 return (0);
383 return (1);
384}
385
386static void
387monitor_reset_key_state(void)
388{
389 /* reset state */
390 if (key_blob != NULL)
391 xfree(key_blob);
392 if (hostbased_cuser != NULL)
393 xfree(hostbased_cuser);
394 if (hostbased_chost != NULL)
395 xfree(hostbased_chost);
396 key_blob = NULL;
397 key_bloblen = 0;
398 key_blobtype = MM_NOKEY;
399 hostbased_cuser = NULL;
400 hostbased_chost = NULL;
401}
402
403int
404mm_answer_moduli(int socket, Buffer *m)
405{
406 DH *dh;
407 int min, want, max;
408
409 min = buffer_get_int(m);
410 want = buffer_get_int(m);
411 max = buffer_get_int(m);
412
413 debug3("%s: got parameters: %d %d %d",
414 __FUNCTION__, min, want, max);
415 /* We need to check here, too, in case the child got corrupted */
416 if (max < min || want < min || max < want)
417 fatal("%s: bad parameters: %d %d %d",
418 __FUNCTION__, min, want, max);
419
420 buffer_clear(m);
421
422 dh = choose_dh(min, want, max);
423 if (dh == NULL) {
424 buffer_put_char(m, 0);
425 return (0);
426 } else {
427 /* Send first bignum */
428 buffer_put_char(m, 1);
429 buffer_put_bignum2(m, dh->p);
430 buffer_put_bignum2(m, dh->g);
431
432 DH_free(dh);
433 }
434 mm_request_send(socket, MONITOR_ANS_MODULI, m);
435 return (0);
436}
437
438int
439mm_answer_sign(int socket, Buffer *m)
440{
441 Key *key;
442 u_char *p;
443 u_char *signature;
444 u_int siglen, datlen;
445 int keyid;
446
447 debug3("%s", __FUNCTION__);
448
449 keyid = buffer_get_int(m);
450 p = buffer_get_string(m, &datlen);
451
452 if (datlen != 20)
453 fatal("%s: data length incorrect: %d", __FUNCTION__, datlen);
454
455 if ((key = get_hostkey_by_index(keyid)) == NULL)
456 fatal("%s: no hostkey from index %d", __FUNCTION__, keyid);
457 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
458 fatal("%s: key_sign failed", __FUNCTION__);
459
460 debug3("%s: signature %p(%d)", __FUNCTION__, signature, siglen);
461
462 buffer_clear(m);
463 buffer_put_string(m, signature, siglen);
464
465 xfree(p);
466 xfree(signature);
467
468 mm_request_send(socket, MONITOR_ANS_SIGN, m);
469
470 /* Turn on permissions for getpwnam */
471 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
472
473 return (0);
474}
475
476/* Retrieves the password entry and also checks if the user is permitted */
477
478int
479mm_answer_pwnamallow(int socket, Buffer *m)
480{
481 char *login;
482 struct passwd *pwent;
483 int allowed = 0;
484
485 debug3("%s", __FUNCTION__);
486
487 if (authctxt->attempt++ != 0)
488 fatal("%s: multiple attempts for getpwnam", __FUNCTION__);
489
490 login = buffer_get_string(m, NULL);
491
492 pwent = getpwnamallow(login);
493
494 authctxt->user = xstrdup(login);
495 setproctitle("%s [priv]", pwent ? login : "unknown");
496 xfree(login);
497
498 buffer_clear(m);
499
500 if (pwent == NULL) {
501 buffer_put_char(m, 0);
502 goto out;
503 }
504
505 allowed = 1;
506 authctxt->pw = pwent;
507 authctxt->valid = 1;
508
509 buffer_put_char(m, 1);
510 buffer_put_string(m, pwent, sizeof(struct passwd));
511 buffer_put_cstring(m, pwent->pw_name);
512 buffer_put_cstring(m, "*");
513 buffer_put_cstring(m, pwent->pw_gecos);
7b18c353 514#ifdef HAVE_PW_CLASS_IN_PASSWD
1853d1ef 515 buffer_put_cstring(m, pwent->pw_class);
7b18c353 516#endif
1853d1ef 517 buffer_put_cstring(m, pwent->pw_dir);
518 buffer_put_cstring(m, pwent->pw_shell);
519
520 out:
521 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __FUNCTION__, allowed);
522 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
523
524 /* For SSHv1 allow authentication now */
525 if (!compat20)
526 monitor_permit_authentications(1);
527 else
528 /* Allow service/style information on the auth context */
529 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
530
efe44db6 531#ifdef USE_PAM
532 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
533#endif
1853d1ef 534
535 return (0);
536}
537
538int
539mm_answer_authserv(int socket, Buffer *m)
540{
541 monitor_permit_authentications(1);
542
543 authctxt->service = buffer_get_string(m, NULL);
544 authctxt->style = buffer_get_string(m, NULL);
545 debug3("%s: service=%s, style=%s",
546 __FUNCTION__, authctxt->service, authctxt->style);
547
548 if (strlen(authctxt->style) == 0) {
549 xfree(authctxt->style);
550 authctxt->style = NULL;
551 }
552
553 return (0);
554}
555
556int
557mm_answer_authpassword(int socket, Buffer *m)
558{
559 static int call_count;
560 char *passwd;
561 int authenticated, plen;
562
563 passwd = buffer_get_string(m, &plen);
564 /* Only authenticate if the context is valid */
565 authenticated = authctxt->valid && auth_password(authctxt, passwd);
566 memset(passwd, 0, strlen(passwd));
567 xfree(passwd);
568
569 buffer_clear(m);
570 buffer_put_int(m, authenticated);
571
572 debug3("%s: sending result %d", __FUNCTION__, authenticated);
573 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
574
575 call_count++;
576 if (plen == 0 && call_count == 1)
577 auth_method = "none";
578 else
579 auth_method = "password";
580
581 /* Causes monitor loop to terminate if authenticated */
582 return (authenticated);
583}
584
585#ifdef BSD_AUTH
586int
587mm_answer_bsdauthquery(int socket, Buffer *m)
588{
589 char *name, *infotxt;
590 u_int numprompts;
591 u_int *echo_on;
592 char **prompts;
593 int res;
594
595 res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
596 &prompts, &echo_on);
597
598 buffer_clear(m);
599 buffer_put_int(m, res);
600 if (res != -1)
601 buffer_put_cstring(m, prompts[0]);
602
603 debug3("%s: sending challenge res: %d", __FUNCTION__, res);
604 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
605
606 if (res != -1) {
607 xfree(name);
608 xfree(infotxt);
609 xfree(prompts);
610 xfree(echo_on);
611 }
612
613 return (0);
614}
615
616int
617mm_answer_bsdauthrespond(int socket, Buffer *m)
618{
619 char *response;
620 int authok;
621
622 if (authctxt->as == 0)
623 fatal("%s: no bsd auth session", __FUNCTION__);
624
625 response = buffer_get_string(m, NULL);
626 authok = auth_userresponse(authctxt->as, response, 0);
627 authctxt->as = NULL;
628 debug3("%s: <%s> = <%d>", __FUNCTION__, response, authok);
629 xfree(response);
630
631 buffer_clear(m);
632 buffer_put_int(m, authok);
633
634 debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
635 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
636
637 auth_method = "bsdauth";
638
639 return (authok != 0);
640}
641#endif
642
643#ifdef SKEY
644int
645mm_answer_skeyquery(int socket, Buffer *m)
646{
647 struct skey skey;
648 char challenge[1024];
649 int res;
650
651 res = skeychallenge(&skey, authctxt->user, challenge);
652
653 buffer_clear(m);
654 buffer_put_int(m, res);
655 if (res != -1)
656 buffer_put_cstring(m, challenge);
657
658 debug3("%s: sending challenge res: %d", __FUNCTION__, res);
659 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
660
661 return (0);
662}
663
664int
665mm_answer_skeyrespond(int socket, Buffer *m)
666{
667 char *response;
668 int authok;
669
670 response = buffer_get_string(m, NULL);
671
672 authok = (authctxt->valid &&
673 skey_haskey(authctxt->pw->pw_name) == 0 &&
674 skey_passcheck(authctxt->pw->pw_name, response) != -1);
675
676 xfree(response);
677
678 buffer_clear(m);
679 buffer_put_int(m, authok);
680
681 debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
682 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
683
684 auth_method = "skey";
685
686 return (authok != 0);
687}
688#endif
689
ad200abb 690#ifdef USE_PAM
691int
692mm_answer_pam_start(int socket, Buffer *m)
693{
694 char *user;
695
696 user = buffer_get_string(m, NULL);
697
698 start_pam(user);
699
700 xfree(user);
701
702 return (0);
703}
704#endif
705
1853d1ef 706static void
707mm_append_debug(Buffer *m)
708{
709 if (auth_debug_init && buffer_len(&auth_debug)) {
710 debug3("%s: Appending debug messages for child", __FUNCTION__);
711 buffer_append(m, buffer_ptr(&auth_debug),
712 buffer_len(&auth_debug));
713 buffer_clear(&auth_debug);
714 }
715}
716
717int
718mm_answer_keyallowed(int socket, Buffer *m)
719{
720 Key *key;
721 u_char *cuser, *chost, *blob;
722 u_int bloblen;
723 enum mm_keytype type = 0;
724 int allowed = 0;
725
726 debug3("%s entering", __FUNCTION__);
727
728 type = buffer_get_int(m);
729 cuser = buffer_get_string(m, NULL);
730 chost = buffer_get_string(m, NULL);
731 blob = buffer_get_string(m, &bloblen);
732
733 key = key_from_blob(blob, bloblen);
734
735 if ((compat20 && type == MM_RSAHOSTKEY) ||
736 (!compat20 && type != MM_RSAHOSTKEY))
737 fatal("%s: key type and protocol mismatch", __FUNCTION__);
738
739 debug3("%s: key_from_blob: %p", __FUNCTION__, key);
740
741 if (key != NULL && authctxt->pw != NULL) {
742 switch(type) {
743 case MM_USERKEY:
744 allowed = user_key_allowed(authctxt->pw, key);
745 break;
746 case MM_HOSTKEY:
747 allowed = hostbased_key_allowed(authctxt->pw,
748 cuser, chost, key);
749 break;
750 case MM_RSAHOSTKEY:
751 key->type = KEY_RSA1; /* XXX */
752 allowed = auth_rhosts_rsa_key_allowed(authctxt->pw,
753 cuser, chost, key);
754 break;
755 default:
756 fatal("%s: unknown key type %d", __FUNCTION__, type);
757 break;
758 }
759 key_free(key);
760 }
761
762 /* clear temporarily storage (used by verify) */
763 monitor_reset_key_state();
764
765 if (allowed) {
766 /* Save temporarily for comparison in verify */
767 key_blob = blob;
768 key_bloblen = bloblen;
769 key_blobtype = type;
770 hostbased_cuser = cuser;
771 hostbased_chost = chost;
772 }
773
774 debug3("%s: key %p is %s",
775 __FUNCTION__, key, allowed ? "allowed" : "disallowed");
776
777 buffer_clear(m);
778 buffer_put_int(m, allowed);
779
780 mm_append_debug(m);
781
782 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
783
784 if (type == MM_RSAHOSTKEY)
785 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
786
787 return (0);
788}
789
790static int
791monitor_valid_userblob(u_char *data, u_int datalen)
792{
793 Buffer b;
794 u_char *p;
795 u_int len;
796 int fail = 0;
797 int session_id2_len = 20 /*XXX should get from [net] */;
798
799 buffer_init(&b);
800 buffer_append(&b, data, datalen);
801
802 if (datafellows & SSH_OLD_SESSIONID) {
803 buffer_consume(&b, session_id2_len);
804 } else {
805 xfree(buffer_get_string(&b, &len));
806 if (len != session_id2_len)
807 fail++;
808 }
809 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
810 fail++;
811 p = buffer_get_string(&b, NULL);
812 if (strcmp(authctxt->user, p) != 0) {
813 log("wrong user name passed to monitor: expected %s != %.100s",
814 authctxt->user, p);
815 fail++;
816 }
817 xfree(p);
818 buffer_skip_string(&b);
819 if (datafellows & SSH_BUG_PKAUTH) {
820 if (!buffer_get_char(&b))
821 fail++;
822 } else {
823 p = buffer_get_string(&b, NULL);
824 if (strcmp("publickey", p) != 0)
825 fail++;
826 xfree(p);
827 if (!buffer_get_char(&b))
828 fail++;
829 buffer_skip_string(&b);
830 }
831 buffer_skip_string(&b);
832 if (buffer_len(&b) != 0)
833 fail++;
834 buffer_free(&b);
835 return (fail == 0);
836}
837
838static int
839monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
840 u_char *chost)
841{
842 Buffer b;
843 u_char *p;
844 u_int len;
845 int fail = 0;
846 int session_id2_len = 20 /*XXX should get from [net] */;
847
848 buffer_init(&b);
849 buffer_append(&b, data, datalen);
850
851 xfree(buffer_get_string(&b, &len));
852 if (len != session_id2_len)
853 fail++;
854 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
855 fail++;
856 p = buffer_get_string(&b, NULL);
857 if (strcmp(authctxt->user, p) != 0) {
858 log("wrong user name passed to monitor: expected %s != %.100s",
859 authctxt->user, p);
860 fail++;
861 }
862 xfree(p);
863 buffer_skip_string(&b); /* service */
864 p = buffer_get_string(&b, NULL);
865 if (strcmp(p, "hostbased") != 0)
866 fail++;
867 xfree(p);
868 buffer_skip_string(&b); /* pkalg */
869 buffer_skip_string(&b); /* pkblob */
870
871 /* verify client host, strip trailing dot if necessary */
872 p = buffer_get_string(&b, NULL);
873 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
874 p[len - 1] = '\0';
875 if (strcmp(p, chost) != 0)
876 fail++;
877 xfree(p);
878
879 /* verify client user */
880 p = buffer_get_string(&b, NULL);
881 if (strcmp(p, cuser) != 0)
882 fail++;
883 xfree(p);
884
885 if (buffer_len(&b) != 0)
886 fail++;
887 buffer_free(&b);
888 return (fail == 0);
889}
890
891int
892mm_answer_keyverify(int socket, Buffer *m)
893{
894 Key *key;
895 u_char *signature, *data, *blob;
896 u_int signaturelen, datalen, bloblen;
897 int verified = 0;
898 int valid_data = 0;
899
900 blob = buffer_get_string(m, &bloblen);
901 signature = buffer_get_string(m, &signaturelen);
902 data = buffer_get_string(m, &datalen);
903
904 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
300e01c4 905 !monitor_allowed_key(blob, bloblen))
1853d1ef 906 fatal("%s: bad key, not previously allowed", __FUNCTION__);
907
908 key = key_from_blob(blob, bloblen);
909 if (key == NULL)
910 fatal("%s: bad public key blob", __FUNCTION__);
911
912 switch (key_blobtype) {
913 case MM_USERKEY:
914 valid_data = monitor_valid_userblob(data, datalen);
915 break;
916 case MM_HOSTKEY:
917 valid_data = monitor_valid_hostbasedblob(data, datalen,
918 hostbased_cuser, hostbased_chost);
919 break;
920 default:
921 valid_data = 0;
922 break;
923 }
924 if (!valid_data)
925 fatal("%s: bad signature data blob", __FUNCTION__);
926
927 verified = key_verify(key, signature, signaturelen, data, datalen);
928 debug3("%s: key %p signature %s",
929 __FUNCTION__, key, verified ? "verified" : "unverified");
930
931 key_free(key);
932 xfree(blob);
933 xfree(signature);
934 xfree(data);
935
936 monitor_reset_key_state();
937
938 buffer_clear(m);
939 buffer_put_int(m, verified);
940 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
941
942 auth_method = "publickey";
943
944 return (verified);
945}
946
947static void
948mm_record_login(Session *s, struct passwd *pw)
949{
950 socklen_t fromlen;
951 struct sockaddr_storage from;
952
953 /*
954 * Get IP address of client. If the connection is not a socket, let
955 * the address be 0.0.0.0.
956 */
957 memset(&from, 0, sizeof(from));
958 if (packet_connection_is_on_socket()) {
959 fromlen = sizeof(from);
960 if (getpeername(packet_get_connection_in(),
961 (struct sockaddr *) & from, &fromlen) < 0) {
962 debug("getpeername: %.100s", strerror(errno));
963 fatal_cleanup();
964 }
965 }
966 /* Record that there was a login on that tty from the remote host. */
967 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
968 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
969 (struct sockaddr *)&from);
970}
971
972static void
973mm_session_close(Session *s)
974{
975 debug3("%s: session %d pid %d", __FUNCTION__, s->self, s->pid);
976 if (s->ttyfd != -1) {
977 debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ptyfd);
978 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
979 session_pty_cleanup2(s);
980 }
981 s->used = 0;
982}
983
984int
985mm_answer_pty(int socket, Buffer *m)
986{
987 extern struct monitor *monitor;
988 Session *s;
989 int res, fd0;
990
991 debug3("%s entering", __FUNCTION__);
992
993 buffer_clear(m);
994 s = session_new();
995 if (s == NULL)
996 goto error;
997 s->authctxt = authctxt;
998 s->pw = authctxt->pw;
999 s->pid = monitor->m_pid;
1000 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1001 if (res == 0)
1002 goto error;
1003 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1004 pty_setowner(authctxt->pw, s->tty);
1005
1006 buffer_put_int(m, 1);
1007 buffer_put_cstring(m, s->tty);
1008 mm_request_send(socket, MONITOR_ANS_PTY, m);
1009
1010 mm_send_fd(socket, s->ptyfd);
1011 mm_send_fd(socket, s->ttyfd);
1012
1013 /* We need to trick ttyslot */
1014 if (dup2(s->ttyfd, 0) == -1)
1015 fatal("%s: dup2", __FUNCTION__);
1016
1017 mm_record_login(s, authctxt->pw);
1018
1019 /* Now we can close the file descriptor again */
1020 close(0);
1021
1022 /* make sure nothing uses fd 0 */
1023 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1024 fatal("%s: open(/dev/null): %s", __FUNCTION__, strerror(errno));
1025 if (fd0 != 0)
1026 error("%s: fd0 %d != 0", __FUNCTION__, fd0);
1027
1028 /* slave is not needed */
1029 close(s->ttyfd);
1030 s->ttyfd = s->ptyfd;
1031 /* no need to dup() because nobody closes ptyfd */
1032 s->ptymaster = s->ptyfd;
1033
1034 debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ttyfd);
1035
1036 return (0);
1037
1038 error:
1039 if (s != NULL)
1040 mm_session_close(s);
1041 buffer_put_int(m, 0);
1042 mm_request_send(socket, MONITOR_ANS_PTY, m);
1043 return (0);
1044}
1045
1046int
1047mm_answer_pty_cleanup(int socket, Buffer *m)
1048{
1049 Session *s;
1050 char *tty;
1051
1052 debug3("%s entering", __FUNCTION__);
1053
1054 tty = buffer_get_string(m, NULL);
1055 if ((s = session_by_tty(tty)) != NULL)
1056 mm_session_close(s);
1057 buffer_clear(m);
1058 xfree(tty);
1059 return (0);
1060}
1061
1062int
1063mm_answer_sesskey(int socket, Buffer *m)
1064{
1065 BIGNUM *p;
1066 int rsafail;
1067
1068 /* Turn off permissions */
1069 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1070
1071 if ((p = BN_new()) == NULL)
1072 fatal("%s: BN_new", __FUNCTION__);
1073
1074 buffer_get_bignum2(m, p);
1075
1076 rsafail = ssh1_session_key(p);
1077
1078 buffer_clear(m);
1079 buffer_put_int(m, rsafail);
1080 buffer_put_bignum2(m, p);
1081
1082 BN_clear_free(p);
1083
1084 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1085
1086 /* Turn on permissions for sessid passing */
1087 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1088
1089 return (0);
1090}
1091
1092int
1093mm_answer_sessid(int socket, Buffer *m)
1094{
1095 int i;
1096
1097 debug3("%s entering", __FUNCTION__);
1098
1099 if (buffer_len(m) != 16)
1100 fatal("%s: bad ssh1 session id", __FUNCTION__);
1101 for (i = 0; i < 16; i++)
1102 session_id[i] = buffer_get_char(m);
1103
1104 /* Turn on permissions for getpwnam */
1105 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1106
1107 return (0);
1108}
1109
1110int
1111mm_answer_rsa_keyallowed(int socket, Buffer *m)
1112{
1113 BIGNUM *client_n;
1114 Key *key = NULL;
1115 u_char *blob = NULL;
1116 u_int blen = 0;
1117 int allowed = 0;
1118
1119 debug3("%s entering", __FUNCTION__);
1120
1121 if (authctxt->valid) {
1122 if ((client_n = BN_new()) == NULL)
1123 fatal("%s: BN_new", __FUNCTION__);
1124 buffer_get_bignum2(m, client_n);
1125 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1126 BN_clear_free(client_n);
1127 }
1128 buffer_clear(m);
1129 buffer_put_int(m, allowed);
1130
1131 /* clear temporarily storage (used by generate challenge) */
1132 monitor_reset_key_state();
1133
1134 if (allowed && key != NULL) {
1135 key->type = KEY_RSA; /* cheat for key_to_blob */
1136 if (key_to_blob(key, &blob, &blen) == 0)
1137 fatal("%s: key_to_blob failed", __FUNCTION__);
1138 buffer_put_string(m, blob, blen);
1139
1140 /* Save temporarily for comparison in verify */
1141 key_blob = blob;
1142 key_bloblen = blen;
1143 key_blobtype = MM_RSAUSERKEY;
1144 key_free(key);
1145 }
1146
1147 mm_append_debug(m);
1148
1149 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1150
1151 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1152 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1153 return (0);
1154}
1155
1156int
1157mm_answer_rsa_challenge(int socket, Buffer *m)
1158{
1159 Key *key = NULL;
1160 u_char *blob;
1161 u_int blen;
1162
1163 debug3("%s entering", __FUNCTION__);
1164
1165 if (!authctxt->valid)
1166 fatal("%s: authctxt not valid", __FUNCTION__);
1167 blob = buffer_get_string(m, &blen);
1168 if (!monitor_allowed_key(blob, blen))
1169 fatal("%s: bad key, not previously allowed", __FUNCTION__);
1170 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1171 fatal("%s: key type mismatch", __FUNCTION__);
1172 if ((key = key_from_blob(blob, blen)) == NULL)
1173 fatal("%s: received bad key", __FUNCTION__);
1174
1175 if (ssh1_challenge)
1176 BN_clear_free(ssh1_challenge);
1177 ssh1_challenge = auth_rsa_generate_challenge(key);
1178
1179 buffer_clear(m);
1180 buffer_put_bignum2(m, ssh1_challenge);
1181
1182 debug3("%s sending reply", __FUNCTION__);
1183 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1184
1185 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1186 return (0);
1187}
1188
1189int
1190mm_answer_rsa_response(int socket, Buffer *m)
1191{
1192 Key *key = NULL;
1193 u_char *blob, *response;
1194 u_int blen, len;
1195 int success;
1196
1197 debug3("%s entering", __FUNCTION__);
1198
1199 if (!authctxt->valid)
1200 fatal("%s: authctxt not valid", __FUNCTION__);
1201 if (ssh1_challenge == NULL)
1202 fatal("%s: no ssh1_challenge", __FUNCTION__);
1203
1204 blob = buffer_get_string(m, &blen);
1205 if (!monitor_allowed_key(blob, blen))
1206 fatal("%s: bad key, not previously allowed", __FUNCTION__);
1207 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1208 fatal("%s: key type mismatch: %d", __FUNCTION__, key_blobtype);
1209 if ((key = key_from_blob(blob, blen)) == NULL)
1210 fatal("%s: received bad key", __FUNCTION__);
1211 response = buffer_get_string(m, &len);
1212 if (len != 16)
1213 fatal("%s: received bad response to challenge", __FUNCTION__);
1214 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1215
1216 key_free(key);
1217 xfree(response);
1218
1219 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1220
1221 /* reset state */
1222 BN_clear_free(ssh1_challenge);
1223 ssh1_challenge = NULL;
1224 monitor_reset_key_state();
1225
1226 buffer_clear(m);
1227 buffer_put_int(m, success);
1228 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1229
1230 return (success);
1231}
1232
1233int
1234mm_answer_term(int socket, Buffer *req)
1235{
1236 extern struct monitor *monitor;
1237 int res, status;
1238
1239 debug3("%s: tearing down sessions", __FUNCTION__);
1240
1241 /* The child is terminating */
1242 session_destroy_all(&mm_session_close);
1243
8c38e88b 1244 while (waitpid(monitor->m_pid, &status, 0) == -1)
1245 if (errno != EINTR)
1246 exit(1);
1853d1ef 1247
1248 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1249
1250 /* Terminate process */
1251 exit (res);
1252}
1253
1254void
1255monitor_apply_keystate(struct monitor *monitor)
1256{
1257 if (compat20) {
1258 set_newkeys(MODE_IN);
1259 set_newkeys(MODE_OUT);
1260 } else {
1261 u_char key[SSH_SESSION_KEY_LENGTH];
1262
1263 memset(key, 'a', sizeof(key));
1264 packet_set_protocol_flags(child_state.ssh1protoflags);
1265 packet_set_encryption_key(key, SSH_SESSION_KEY_LENGTH,
1266 child_state.ssh1cipher);
1267 }
1268
1269 packet_set_keycontext(MODE_OUT, child_state.keyout);
1270 xfree(child_state.keyout);
1271 packet_set_keycontext(MODE_IN, child_state.keyin);
1272 xfree(child_state.keyin);
1273
1274 if (!compat20) {
1275 packet_set_iv(MODE_OUT, child_state.ivout);
1276 xfree(child_state.ivout);
1277 packet_set_iv(MODE_IN, child_state.ivin);
1278 xfree(child_state.ivin);
1279 }
1280
1281 memcpy(&incoming_stream, &child_state.incoming,
1282 sizeof(incoming_stream));
1283 memcpy(&outgoing_stream, &child_state.outgoing,
1284 sizeof(outgoing_stream));
1285
1286 /* Update with new address */
1287 mm_init_compression(monitor->m_zlib);
1288
1289 /* Network I/O buffers */
1290 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1291 buffer_clear(&input);
1292 buffer_append(&input, child_state.input, child_state.ilen);
1293 memset(child_state.input, 0, child_state.ilen);
1294 xfree(child_state.input);
1295
1296 buffer_clear(&output);
1297 buffer_append(&output, child_state.output, child_state.olen);
1298 memset(child_state.output, 0, child_state.olen);
1299 xfree(child_state.output);
1300}
1301
1302static Kex *
1303mm_get_kex(Buffer *m)
1304{
1305 Kex *kex;
1306 void *blob;
1307 u_int bloblen;
1308
1309 kex = xmalloc(sizeof(*kex));
1310 memset(kex, 0, sizeof(*kex));
1311 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1312 kex->we_need = buffer_get_int(m);
1313 kex->server = 1;
1314 kex->hostkey_type = buffer_get_int(m);
1315 kex->kex_type = buffer_get_int(m);
1316 blob = buffer_get_string(m, &bloblen);
1317 buffer_init(&kex->my);
1318 buffer_append(&kex->my, blob, bloblen);
1319 xfree(blob);
1320 blob = buffer_get_string(m, &bloblen);
1321 buffer_init(&kex->peer);
1322 buffer_append(&kex->peer, blob, bloblen);
1323 xfree(blob);
1324 kex->done = 1;
1325 kex->flags = buffer_get_int(m);
1326 kex->client_version_string = buffer_get_string(m, NULL);
1327 kex->server_version_string = buffer_get_string(m, NULL);
1328 kex->load_host_key=&get_hostkey_by_type;
1329 kex->host_key_index=&get_hostkey_index;
1330
1331 return (kex);
1332}
1333
1334/* This function requries careful sanity checking */
1335
1336void
1337mm_get_keystate(struct monitor *monitor)
1338{
1339 Buffer m;
1340 u_char *blob, *p;
1341 u_int bloblen, plen;
1342
1343 debug3("%s: Waiting for new keys", __FUNCTION__);
1344
1345 buffer_init(&m);
1346 mm_request_receive_expect(monitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1347 if (!compat20) {
1348 child_state.ssh1protoflags = buffer_get_int(&m);
1349 child_state.ssh1cipher = buffer_get_int(&m);
1350 child_state.ivout = buffer_get_string(&m,
1351 &child_state.ivoutlen);
1352 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1353 goto skip;
1354 } else {
1355 /* Get the Kex for rekeying */
1356 *monitor->m_pkex = mm_get_kex(&m);
1357 }
1358
1359 blob = buffer_get_string(&m, &bloblen);
1360 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1361 xfree(blob);
1362
1363 debug3("%s: Waiting for second key", __FUNCTION__);
1364 blob = buffer_get_string(&m, &bloblen);
1365 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1366 xfree(blob);
1367
1368 /* Now get sequence numbers for the packets */
1369 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1370 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1371
1372 skip:
1373 /* Get the key context */
1374 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1375 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1376
1377 debug3("%s: Getting compression state", __FUNCTION__);
1378 /* Get compression state */
1379 p = buffer_get_string(&m, &plen);
1380 if (plen != sizeof(child_state.outgoing))
1381 fatal("%s: bad request size", __FUNCTION__);
1382 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1383 xfree(p);
1384
1385 p = buffer_get_string(&m, &plen);
1386 if (plen != sizeof(child_state.incoming))
1387 fatal("%s: bad request size", __FUNCTION__);
1388 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1389 xfree(p);
1390
1391 /* Network I/O buffers */
1392 debug3("%s: Getting Network I/O buffers", __FUNCTION__);
1393 child_state.input = buffer_get_string(&m, &child_state.ilen);
1394 child_state.output = buffer_get_string(&m, &child_state.olen);
1395
1396 buffer_free(&m);
1397}
1398
1399
1400/* Allocation functions for zlib */
1401void *
1402mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1403{
1404 void *address;
1405
1406 address = mm_malloc(mm, size * ncount);
1407
1408 return (address);
1409}
1410
1411void
1412mm_zfree(struct mm_master *mm, void *address)
1413{
1414 mm_free(mm, address);
1415}
1416
1417void
1418mm_init_compression(struct mm_master *mm)
1419{
1420 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1421 outgoing_stream.zfree = (free_func)mm_zfree;
1422 outgoing_stream.opaque = mm;
1423
1424 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1425 incoming_stream.zfree = (free_func)mm_zfree;
1426 incoming_stream.opaque = mm;
1427}
1428
1429/* XXX */
1430
1431#define FD_CLOSEONEXEC(x) do { \
1432 if (fcntl(x, F_SETFD, 1) == -1) \
1433 fatal("fcntl(%d, F_SETFD)", x); \
1434} while (0)
1435
1436static void
1437monitor_socketpair(int *pair)
1438{
f1af2dbf 1439#ifdef HAVE_SOCKETPAIR
1853d1ef 1440 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1441 fatal("%s: socketpair", __FUNCTION__);
f1af2dbf 1442#else
1443 fatal("%s: UsePrivilegeSeparation=yes not supported",
1444 __FUNCTION__);
1445#endif
1853d1ef 1446 FD_CLOSEONEXEC(pair[0]);
1447 FD_CLOSEONEXEC(pair[1]);
1448}
1449
1450#define MM_MEMSIZE 65536
1451
1452struct monitor *
1453monitor_init(void)
1454{
1455 struct monitor *mon;
1456 int pair[2];
1457
1458 mon = xmalloc(sizeof(*mon));
1459
1460 monitor_socketpair(pair);
1461
1462 mon->m_recvfd = pair[0];
1463 mon->m_sendfd = pair[1];
1464
1465 /* Used to share zlib space across processes */
1466 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1467 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1468
1469 /* Compression needs to share state across borders */
1470 mm_init_compression(mon->m_zlib);
1471
1472 return mon;
1473}
1474
1475void
1476monitor_reinit(struct monitor *mon)
1477{
1478 int pair[2];
1479
1480 monitor_socketpair(pair);
1481
1482 mon->m_recvfd = pair[0];
1483 mon->m_sendfd = pair[1];
1484}
git-cvsimport mirror of OpenSSH
This page took 0.392167 seconds and 5 git commands to generate.