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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"
300e01c4 28RCSID("$OpenBSD: monitor.c,v 1.8 2002/03/27 17:45:42 mouring 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
116static Authctxt *authctxt;
117static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
118
119/* local state for key verify */
120static u_char *key_blob = NULL;
121static u_int key_bloblen = 0;
122static int key_blobtype = MM_NOKEY;
123static u_char *hostbased_cuser = NULL;
124static u_char *hostbased_chost = NULL;
125static char *auth_method = "unknown";
126
127struct mon_table {
128 enum monitor_reqtype type;
129 int flags;
130 int (*f)(int, Buffer *);
131};
132
133#define MON_ISAUTH 0x0004 /* Required for Authentication */
134#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
135#define MON_ONCE 0x0010 /* Disable after calling */
136
137#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
138
139#define MON_PERMIT 0x1000 /* Request is permitted */
140
141struct mon_table mon_dispatch_proto20[] = {
142 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
143 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
144 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
145 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
146 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
147#ifdef BSD_AUTH
148 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
149 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
150#endif
151#ifdef SKEY
152 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
153 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
154#endif
155 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
156 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
157 {0, 0, NULL}
158};
159
160struct mon_table mon_dispatch_postauth20[] = {
161 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
162 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
163 {MONITOR_REQ_PTY, 0, mm_answer_pty},
164 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
165 {MONITOR_REQ_TERM, 0, mm_answer_term},
166 {0, 0, NULL}
167};
168
169struct mon_table mon_dispatch_proto15[] = {
170 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
171 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
172 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
173 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
174 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
175 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
176 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
177 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
178#ifdef BSD_AUTH
179 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
180 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
181#endif
182#ifdef SKEY
183 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
184 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
185#endif
186 {0, 0, NULL}
187};
188
189struct mon_table mon_dispatch_postauth15[] = {
190 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
191 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
192 {MONITOR_REQ_TERM, 0, mm_answer_term},
193 {0, 0, NULL}
194};
195
196struct mon_table *mon_dispatch;
197
198/* Specifies if a certain message is allowed at the moment */
199
200static void
201monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
202{
203 while (ent->f != NULL) {
204 if (ent->type == type) {
205 ent->flags &= ~MON_PERMIT;
206 ent->flags |= permit ? MON_PERMIT : 0;
207 return;
208 }
209 ent++;
210 }
211}
212
213static void
214monitor_permit_authentications(int permit)
215{
216 struct mon_table *ent = mon_dispatch;
217
218 while (ent->f != NULL) {
219 if (ent->flags & MON_AUTH) {
220 ent->flags &= ~MON_PERMIT;
221 ent->flags |= permit ? MON_PERMIT : 0;
222 }
223 ent++;
224 }
225}
226
227Authctxt *
228monitor_child_preauth(struct monitor *monitor)
229{
230 struct mon_table *ent;
231 int authenticated = 0;
232
233 debug3("preauth child monitor started");
234
235 if (compat20) {
236 mon_dispatch = mon_dispatch_proto20;
237
238 /* Permit requests for moduli and signatures */
239 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
240 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
241 } else {
242 mon_dispatch = mon_dispatch_proto15;
243
244 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
245 }
246
247 authctxt = authctxt_new();
248
249 /* The first few requests do not require asynchronous access */
250 while (!authenticated) {
251 authenticated = monitor_read(monitor, mon_dispatch, &ent);
252 if (authenticated) {
253 if (!(ent->flags & MON_AUTHDECIDE))
254 fatal("%s: unexpected authentication from %d",
255 __FUNCTION__, ent->type);
256 if (authctxt->pw->pw_uid == 0 &&
257 !auth_root_allowed(auth_method))
258 authenticated = 0;
259 }
260
261 if (ent->flags & MON_AUTHDECIDE) {
262 auth_log(authctxt, authenticated, auth_method,
263 compat20 ? " ssh2" : "");
264 if (!authenticated)
265 authctxt->failures++;
266 }
267 }
268
269 if (!authctxt->valid)
270 fatal("%s: authenticated invalid user", __FUNCTION__);
271
272 debug("%s: %s has been authenticated by privileged process",
273 __FUNCTION__, authctxt->user);
274
275 mm_get_keystate(monitor);
276
277 return (authctxt);
278}
279
280void
281monitor_child_postauth(struct monitor *monitor)
282{
283 if (compat20) {
284 mon_dispatch = mon_dispatch_postauth20;
285
286 /* Permit requests for moduli and signatures */
287 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
288 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
289 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
290
291 } else {
292 mon_dispatch = mon_dispatch_postauth15;
293 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
294 }
295 if (!no_pty_flag) {
296 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
297 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
298 }
299
300 for (;;)
301 monitor_read(monitor, mon_dispatch, NULL);
302}
303
304void
305monitor_sync(struct monitor *monitor)
306{
307 /* The member allocation is not visible, so sync it */
308 mm_share_sync(&monitor->m_zlib, &monitor->m_zback);
309}
310
311int
312monitor_read(struct monitor *monitor, struct mon_table *ent,
313 struct mon_table **pent)
314{
315 Buffer m;
316 int ret;
317 u_char type;
318
319 buffer_init(&m);
320
321 mm_request_receive(monitor->m_sendfd, &m);
322 type = buffer_get_char(&m);
323
324 debug3("%s: checking request %d", __FUNCTION__, type);
325
326 while (ent->f != NULL) {
327 if (ent->type == type)
328 break;
329 ent++;
330 }
331
332 if (ent->f != NULL) {
333 if (!(ent->flags & MON_PERMIT))
334 fatal("%s: unpermitted request %d", __FUNCTION__,
335 type);
336 ret = (*ent->f)(monitor->m_sendfd, &m);
337 buffer_free(&m);
338
339 /* The child may use this request only once, disable it */
340 if (ent->flags & MON_ONCE) {
341 debug2("%s: %d used once, disabling now", __FUNCTION__,
342 type);
343 ent->flags &= ~MON_PERMIT;
344 }
345
346 if (pent != NULL)
347 *pent = ent;
348
349 return ret;
350 }
351
38c1c52a 352 fatal("%s: unsupported request: %d", __FUNCTION__, type);
1853d1ef 353
354 /* NOTREACHED */
355 return (-1);
356}
357
358/* allowed key state */
359static int
360monitor_allowed_key(u_char *blob, u_int bloblen)
361{
362 /* make sure key is allowed */
363 if (key_blob == NULL || key_bloblen != bloblen ||
364 memcmp(key_blob, blob, key_bloblen))
365 return (0);
366 return (1);
367}
368
369static void
370monitor_reset_key_state(void)
371{
372 /* reset state */
373 if (key_blob != NULL)
374 xfree(key_blob);
375 if (hostbased_cuser != NULL)
376 xfree(hostbased_cuser);
377 if (hostbased_chost != NULL)
378 xfree(hostbased_chost);
379 key_blob = NULL;
380 key_bloblen = 0;
381 key_blobtype = MM_NOKEY;
382 hostbased_cuser = NULL;
383 hostbased_chost = NULL;
384}
385
386int
387mm_answer_moduli(int socket, Buffer *m)
388{
389 DH *dh;
390 int min, want, max;
391
392 min = buffer_get_int(m);
393 want = buffer_get_int(m);
394 max = buffer_get_int(m);
395
396 debug3("%s: got parameters: %d %d %d",
397 __FUNCTION__, min, want, max);
398 /* We need to check here, too, in case the child got corrupted */
399 if (max < min || want < min || max < want)
400 fatal("%s: bad parameters: %d %d %d",
401 __FUNCTION__, min, want, max);
402
403 buffer_clear(m);
404
405 dh = choose_dh(min, want, max);
406 if (dh == NULL) {
407 buffer_put_char(m, 0);
408 return (0);
409 } else {
410 /* Send first bignum */
411 buffer_put_char(m, 1);
412 buffer_put_bignum2(m, dh->p);
413 buffer_put_bignum2(m, dh->g);
414
415 DH_free(dh);
416 }
417 mm_request_send(socket, MONITOR_ANS_MODULI, m);
418 return (0);
419}
420
421int
422mm_answer_sign(int socket, Buffer *m)
423{
424 Key *key;
425 u_char *p;
426 u_char *signature;
427 u_int siglen, datlen;
428 int keyid;
429
430 debug3("%s", __FUNCTION__);
431
432 keyid = buffer_get_int(m);
433 p = buffer_get_string(m, &datlen);
434
435 if (datlen != 20)
436 fatal("%s: data length incorrect: %d", __FUNCTION__, datlen);
437
438 if ((key = get_hostkey_by_index(keyid)) == NULL)
439 fatal("%s: no hostkey from index %d", __FUNCTION__, keyid);
440 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
441 fatal("%s: key_sign failed", __FUNCTION__);
442
443 debug3("%s: signature %p(%d)", __FUNCTION__, signature, siglen);
444
445 buffer_clear(m);
446 buffer_put_string(m, signature, siglen);
447
448 xfree(p);
449 xfree(signature);
450
451 mm_request_send(socket, MONITOR_ANS_SIGN, m);
452
453 /* Turn on permissions for getpwnam */
454 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
455
456 return (0);
457}
458
459/* Retrieves the password entry and also checks if the user is permitted */
460
461int
462mm_answer_pwnamallow(int socket, Buffer *m)
463{
464 char *login;
465 struct passwd *pwent;
466 int allowed = 0;
467
468 debug3("%s", __FUNCTION__);
469
470 if (authctxt->attempt++ != 0)
471 fatal("%s: multiple attempts for getpwnam", __FUNCTION__);
472
473 login = buffer_get_string(m, NULL);
474
475 pwent = getpwnamallow(login);
476
477 authctxt->user = xstrdup(login);
478 setproctitle("%s [priv]", pwent ? login : "unknown");
479 xfree(login);
480
481 buffer_clear(m);
482
483 if (pwent == NULL) {
484 buffer_put_char(m, 0);
485 goto out;
486 }
487
488 allowed = 1;
489 authctxt->pw = pwent;
490 authctxt->valid = 1;
491
492 buffer_put_char(m, 1);
493 buffer_put_string(m, pwent, sizeof(struct passwd));
494 buffer_put_cstring(m, pwent->pw_name);
495 buffer_put_cstring(m, "*");
496 buffer_put_cstring(m, pwent->pw_gecos);
7b18c353 497#ifdef HAVE_PW_CLASS_IN_PASSWD
1853d1ef 498 buffer_put_cstring(m, pwent->pw_class);
7b18c353 499#endif
1853d1ef 500 buffer_put_cstring(m, pwent->pw_dir);
501 buffer_put_cstring(m, pwent->pw_shell);
502
503 out:
504 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __FUNCTION__, allowed);
505 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
506
507 /* For SSHv1 allow authentication now */
508 if (!compat20)
509 monitor_permit_authentications(1);
510 else
511 /* Allow service/style information on the auth context */
512 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
513
514
515 return (0);
516}
517
518int
519mm_answer_authserv(int socket, Buffer *m)
520{
521 monitor_permit_authentications(1);
522
523 authctxt->service = buffer_get_string(m, NULL);
524 authctxt->style = buffer_get_string(m, NULL);
525 debug3("%s: service=%s, style=%s",
526 __FUNCTION__, authctxt->service, authctxt->style);
527
528 if (strlen(authctxt->style) == 0) {
529 xfree(authctxt->style);
530 authctxt->style = NULL;
531 }
532
533 return (0);
534}
535
536int
537mm_answer_authpassword(int socket, Buffer *m)
538{
539 static int call_count;
540 char *passwd;
541 int authenticated, plen;
542
543 passwd = buffer_get_string(m, &plen);
544 /* Only authenticate if the context is valid */
545 authenticated = authctxt->valid && auth_password(authctxt, passwd);
546 memset(passwd, 0, strlen(passwd));
547 xfree(passwd);
548
549 buffer_clear(m);
550 buffer_put_int(m, authenticated);
551
552 debug3("%s: sending result %d", __FUNCTION__, authenticated);
553 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
554
555 call_count++;
556 if (plen == 0 && call_count == 1)
557 auth_method = "none";
558 else
559 auth_method = "password";
560
561 /* Causes monitor loop to terminate if authenticated */
562 return (authenticated);
563}
564
565#ifdef BSD_AUTH
566int
567mm_answer_bsdauthquery(int socket, Buffer *m)
568{
569 char *name, *infotxt;
570 u_int numprompts;
571 u_int *echo_on;
572 char **prompts;
573 int res;
574
575 res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
576 &prompts, &echo_on);
577
578 buffer_clear(m);
579 buffer_put_int(m, res);
580 if (res != -1)
581 buffer_put_cstring(m, prompts[0]);
582
583 debug3("%s: sending challenge res: %d", __FUNCTION__, res);
584 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
585
586 if (res != -1) {
587 xfree(name);
588 xfree(infotxt);
589 xfree(prompts);
590 xfree(echo_on);
591 }
592
593 return (0);
594}
595
596int
597mm_answer_bsdauthrespond(int socket, Buffer *m)
598{
599 char *response;
600 int authok;
601
602 if (authctxt->as == 0)
603 fatal("%s: no bsd auth session", __FUNCTION__);
604
605 response = buffer_get_string(m, NULL);
606 authok = auth_userresponse(authctxt->as, response, 0);
607 authctxt->as = NULL;
608 debug3("%s: <%s> = <%d>", __FUNCTION__, response, authok);
609 xfree(response);
610
611 buffer_clear(m);
612 buffer_put_int(m, authok);
613
614 debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
615 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
616
617 auth_method = "bsdauth";
618
619 return (authok != 0);
620}
621#endif
622
623#ifdef SKEY
624int
625mm_answer_skeyquery(int socket, Buffer *m)
626{
627 struct skey skey;
628 char challenge[1024];
629 int res;
630
631 res = skeychallenge(&skey, authctxt->user, challenge);
632
633 buffer_clear(m);
634 buffer_put_int(m, res);
635 if (res != -1)
636 buffer_put_cstring(m, challenge);
637
638 debug3("%s: sending challenge res: %d", __FUNCTION__, res);
639 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
640
641 return (0);
642}
643
644int
645mm_answer_skeyrespond(int socket, Buffer *m)
646{
647 char *response;
648 int authok;
649
650 response = buffer_get_string(m, NULL);
651
652 authok = (authctxt->valid &&
653 skey_haskey(authctxt->pw->pw_name) == 0 &&
654 skey_passcheck(authctxt->pw->pw_name, response) != -1);
655
656 xfree(response);
657
658 buffer_clear(m);
659 buffer_put_int(m, authok);
660
661 debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
662 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
663
664 auth_method = "skey";
665
666 return (authok != 0);
667}
668#endif
669
670static void
671mm_append_debug(Buffer *m)
672{
673 if (auth_debug_init && buffer_len(&auth_debug)) {
674 debug3("%s: Appending debug messages for child", __FUNCTION__);
675 buffer_append(m, buffer_ptr(&auth_debug),
676 buffer_len(&auth_debug));
677 buffer_clear(&auth_debug);
678 }
679}
680
681int
682mm_answer_keyallowed(int socket, Buffer *m)
683{
684 Key *key;
685 u_char *cuser, *chost, *blob;
686 u_int bloblen;
687 enum mm_keytype type = 0;
688 int allowed = 0;
689
690 debug3("%s entering", __FUNCTION__);
691
692 type = buffer_get_int(m);
693 cuser = buffer_get_string(m, NULL);
694 chost = buffer_get_string(m, NULL);
695 blob = buffer_get_string(m, &bloblen);
696
697 key = key_from_blob(blob, bloblen);
698
699 if ((compat20 && type == MM_RSAHOSTKEY) ||
700 (!compat20 && type != MM_RSAHOSTKEY))
701 fatal("%s: key type and protocol mismatch", __FUNCTION__);
702
703 debug3("%s: key_from_blob: %p", __FUNCTION__, key);
704
705 if (key != NULL && authctxt->pw != NULL) {
706 switch(type) {
707 case MM_USERKEY:
708 allowed = user_key_allowed(authctxt->pw, key);
709 break;
710 case MM_HOSTKEY:
711 allowed = hostbased_key_allowed(authctxt->pw,
712 cuser, chost, key);
713 break;
714 case MM_RSAHOSTKEY:
715 key->type = KEY_RSA1; /* XXX */
716 allowed = auth_rhosts_rsa_key_allowed(authctxt->pw,
717 cuser, chost, key);
718 break;
719 default:
720 fatal("%s: unknown key type %d", __FUNCTION__, type);
721 break;
722 }
723 key_free(key);
724 }
725
726 /* clear temporarily storage (used by verify) */
727 monitor_reset_key_state();
728
729 if (allowed) {
730 /* Save temporarily for comparison in verify */
731 key_blob = blob;
732 key_bloblen = bloblen;
733 key_blobtype = type;
734 hostbased_cuser = cuser;
735 hostbased_chost = chost;
736 }
737
738 debug3("%s: key %p is %s",
739 __FUNCTION__, key, allowed ? "allowed" : "disallowed");
740
741 buffer_clear(m);
742 buffer_put_int(m, allowed);
743
744 mm_append_debug(m);
745
746 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
747
748 if (type == MM_RSAHOSTKEY)
749 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
750
751 return (0);
752}
753
754static int
755monitor_valid_userblob(u_char *data, u_int datalen)
756{
757 Buffer b;
758 u_char *p;
759 u_int len;
760 int fail = 0;
761 int session_id2_len = 20 /*XXX should get from [net] */;
762
763 buffer_init(&b);
764 buffer_append(&b, data, datalen);
765
766 if (datafellows & SSH_OLD_SESSIONID) {
767 buffer_consume(&b, session_id2_len);
768 } else {
769 xfree(buffer_get_string(&b, &len));
770 if (len != session_id2_len)
771 fail++;
772 }
773 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
774 fail++;
775 p = buffer_get_string(&b, NULL);
776 if (strcmp(authctxt->user, p) != 0) {
777 log("wrong user name passed to monitor: expected %s != %.100s",
778 authctxt->user, p);
779 fail++;
780 }
781 xfree(p);
782 buffer_skip_string(&b);
783 if (datafellows & SSH_BUG_PKAUTH) {
784 if (!buffer_get_char(&b))
785 fail++;
786 } else {
787 p = buffer_get_string(&b, NULL);
788 if (strcmp("publickey", p) != 0)
789 fail++;
790 xfree(p);
791 if (!buffer_get_char(&b))
792 fail++;
793 buffer_skip_string(&b);
794 }
795 buffer_skip_string(&b);
796 if (buffer_len(&b) != 0)
797 fail++;
798 buffer_free(&b);
799 return (fail == 0);
800}
801
802static int
803monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
804 u_char *chost)
805{
806 Buffer b;
807 u_char *p;
808 u_int len;
809 int fail = 0;
810 int session_id2_len = 20 /*XXX should get from [net] */;
811
812 buffer_init(&b);
813 buffer_append(&b, data, datalen);
814
815 xfree(buffer_get_string(&b, &len));
816 if (len != session_id2_len)
817 fail++;
818 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
819 fail++;
820 p = buffer_get_string(&b, NULL);
821 if (strcmp(authctxt->user, p) != 0) {
822 log("wrong user name passed to monitor: expected %s != %.100s",
823 authctxt->user, p);
824 fail++;
825 }
826 xfree(p);
827 buffer_skip_string(&b); /* service */
828 p = buffer_get_string(&b, NULL);
829 if (strcmp(p, "hostbased") != 0)
830 fail++;
831 xfree(p);
832 buffer_skip_string(&b); /* pkalg */
833 buffer_skip_string(&b); /* pkblob */
834
835 /* verify client host, strip trailing dot if necessary */
836 p = buffer_get_string(&b, NULL);
837 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
838 p[len - 1] = '\0';
839 if (strcmp(p, chost) != 0)
840 fail++;
841 xfree(p);
842
843 /* verify client user */
844 p = buffer_get_string(&b, NULL);
845 if (strcmp(p, cuser) != 0)
846 fail++;
847 xfree(p);
848
849 if (buffer_len(&b) != 0)
850 fail++;
851 buffer_free(&b);
852 return (fail == 0);
853}
854
855int
856mm_answer_keyverify(int socket, Buffer *m)
857{
858 Key *key;
859 u_char *signature, *data, *blob;
860 u_int signaturelen, datalen, bloblen;
861 int verified = 0;
862 int valid_data = 0;
863
864 blob = buffer_get_string(m, &bloblen);
865 signature = buffer_get_string(m, &signaturelen);
866 data = buffer_get_string(m, &datalen);
867
868 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
300e01c4 869 !monitor_allowed_key(blob, bloblen))
1853d1ef 870 fatal("%s: bad key, not previously allowed", __FUNCTION__);
871
872 key = key_from_blob(blob, bloblen);
873 if (key == NULL)
874 fatal("%s: bad public key blob", __FUNCTION__);
875
876 switch (key_blobtype) {
877 case MM_USERKEY:
878 valid_data = monitor_valid_userblob(data, datalen);
879 break;
880 case MM_HOSTKEY:
881 valid_data = monitor_valid_hostbasedblob(data, datalen,
882 hostbased_cuser, hostbased_chost);
883 break;
884 default:
885 valid_data = 0;
886 break;
887 }
888 if (!valid_data)
889 fatal("%s: bad signature data blob", __FUNCTION__);
890
891 verified = key_verify(key, signature, signaturelen, data, datalen);
892 debug3("%s: key %p signature %s",
893 __FUNCTION__, key, verified ? "verified" : "unverified");
894
895 key_free(key);
896 xfree(blob);
897 xfree(signature);
898 xfree(data);
899
900 monitor_reset_key_state();
901
902 buffer_clear(m);
903 buffer_put_int(m, verified);
904 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
905
906 auth_method = "publickey";
907
908 return (verified);
909}
910
911static void
912mm_record_login(Session *s, struct passwd *pw)
913{
914 socklen_t fromlen;
915 struct sockaddr_storage from;
916
917 /*
918 * Get IP address of client. If the connection is not a socket, let
919 * the address be 0.0.0.0.
920 */
921 memset(&from, 0, sizeof(from));
922 if (packet_connection_is_on_socket()) {
923 fromlen = sizeof(from);
924 if (getpeername(packet_get_connection_in(),
925 (struct sockaddr *) & from, &fromlen) < 0) {
926 debug("getpeername: %.100s", strerror(errno));
927 fatal_cleanup();
928 }
929 }
930 /* Record that there was a login on that tty from the remote host. */
931 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
932 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
933 (struct sockaddr *)&from);
934}
935
936static void
937mm_session_close(Session *s)
938{
939 debug3("%s: session %d pid %d", __FUNCTION__, s->self, s->pid);
940 if (s->ttyfd != -1) {
941 debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ptyfd);
942 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
943 session_pty_cleanup2(s);
944 }
945 s->used = 0;
946}
947
948int
949mm_answer_pty(int socket, Buffer *m)
950{
951 extern struct monitor *monitor;
952 Session *s;
953 int res, fd0;
954
955 debug3("%s entering", __FUNCTION__);
956
957 buffer_clear(m);
958 s = session_new();
959 if (s == NULL)
960 goto error;
961 s->authctxt = authctxt;
962 s->pw = authctxt->pw;
963 s->pid = monitor->m_pid;
964 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
965 if (res == 0)
966 goto error;
967 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
968 pty_setowner(authctxt->pw, s->tty);
969
970 buffer_put_int(m, 1);
971 buffer_put_cstring(m, s->tty);
972 mm_request_send(socket, MONITOR_ANS_PTY, m);
973
974 mm_send_fd(socket, s->ptyfd);
975 mm_send_fd(socket, s->ttyfd);
976
977 /* We need to trick ttyslot */
978 if (dup2(s->ttyfd, 0) == -1)
979 fatal("%s: dup2", __FUNCTION__);
980
981 mm_record_login(s, authctxt->pw);
982
983 /* Now we can close the file descriptor again */
984 close(0);
985
986 /* make sure nothing uses fd 0 */
987 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
988 fatal("%s: open(/dev/null): %s", __FUNCTION__, strerror(errno));
989 if (fd0 != 0)
990 error("%s: fd0 %d != 0", __FUNCTION__, fd0);
991
992 /* slave is not needed */
993 close(s->ttyfd);
994 s->ttyfd = s->ptyfd;
995 /* no need to dup() because nobody closes ptyfd */
996 s->ptymaster = s->ptyfd;
997
998 debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ttyfd);
999
1000 return (0);
1001
1002 error:
1003 if (s != NULL)
1004 mm_session_close(s);
1005 buffer_put_int(m, 0);
1006 mm_request_send(socket, MONITOR_ANS_PTY, m);
1007 return (0);
1008}
1009
1010int
1011mm_answer_pty_cleanup(int socket, Buffer *m)
1012{
1013 Session *s;
1014 char *tty;
1015
1016 debug3("%s entering", __FUNCTION__);
1017
1018 tty = buffer_get_string(m, NULL);
1019 if ((s = session_by_tty(tty)) != NULL)
1020 mm_session_close(s);
1021 buffer_clear(m);
1022 xfree(tty);
1023 return (0);
1024}
1025
1026int
1027mm_answer_sesskey(int socket, Buffer *m)
1028{
1029 BIGNUM *p;
1030 int rsafail;
1031
1032 /* Turn off permissions */
1033 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1034
1035 if ((p = BN_new()) == NULL)
1036 fatal("%s: BN_new", __FUNCTION__);
1037
1038 buffer_get_bignum2(m, p);
1039
1040 rsafail = ssh1_session_key(p);
1041
1042 buffer_clear(m);
1043 buffer_put_int(m, rsafail);
1044 buffer_put_bignum2(m, p);
1045
1046 BN_clear_free(p);
1047
1048 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1049
1050 /* Turn on permissions for sessid passing */
1051 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1052
1053 return (0);
1054}
1055
1056int
1057mm_answer_sessid(int socket, Buffer *m)
1058{
1059 int i;
1060
1061 debug3("%s entering", __FUNCTION__);
1062
1063 if (buffer_len(m) != 16)
1064 fatal("%s: bad ssh1 session id", __FUNCTION__);
1065 for (i = 0; i < 16; i++)
1066 session_id[i] = buffer_get_char(m);
1067
1068 /* Turn on permissions for getpwnam */
1069 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1070
1071 return (0);
1072}
1073
1074int
1075mm_answer_rsa_keyallowed(int socket, Buffer *m)
1076{
1077 BIGNUM *client_n;
1078 Key *key = NULL;
1079 u_char *blob = NULL;
1080 u_int blen = 0;
1081 int allowed = 0;
1082
1083 debug3("%s entering", __FUNCTION__);
1084
1085 if (authctxt->valid) {
1086 if ((client_n = BN_new()) == NULL)
1087 fatal("%s: BN_new", __FUNCTION__);
1088 buffer_get_bignum2(m, client_n);
1089 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1090 BN_clear_free(client_n);
1091 }
1092 buffer_clear(m);
1093 buffer_put_int(m, allowed);
1094
1095 /* clear temporarily storage (used by generate challenge) */
1096 monitor_reset_key_state();
1097
1098 if (allowed && key != NULL) {
1099 key->type = KEY_RSA; /* cheat for key_to_blob */
1100 if (key_to_blob(key, &blob, &blen) == 0)
1101 fatal("%s: key_to_blob failed", __FUNCTION__);
1102 buffer_put_string(m, blob, blen);
1103
1104 /* Save temporarily for comparison in verify */
1105 key_blob = blob;
1106 key_bloblen = blen;
1107 key_blobtype = MM_RSAUSERKEY;
1108 key_free(key);
1109 }
1110
1111 mm_append_debug(m);
1112
1113 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1114
1115 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1116 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1117 return (0);
1118}
1119
1120int
1121mm_answer_rsa_challenge(int socket, Buffer *m)
1122{
1123 Key *key = NULL;
1124 u_char *blob;
1125 u_int blen;
1126
1127 debug3("%s entering", __FUNCTION__);
1128
1129 if (!authctxt->valid)
1130 fatal("%s: authctxt not valid", __FUNCTION__);
1131 blob = buffer_get_string(m, &blen);
1132 if (!monitor_allowed_key(blob, blen))
1133 fatal("%s: bad key, not previously allowed", __FUNCTION__);
1134 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1135 fatal("%s: key type mismatch", __FUNCTION__);
1136 if ((key = key_from_blob(blob, blen)) == NULL)
1137 fatal("%s: received bad key", __FUNCTION__);
1138
1139 if (ssh1_challenge)
1140 BN_clear_free(ssh1_challenge);
1141 ssh1_challenge = auth_rsa_generate_challenge(key);
1142
1143 buffer_clear(m);
1144 buffer_put_bignum2(m, ssh1_challenge);
1145
1146 debug3("%s sending reply", __FUNCTION__);
1147 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1148
1149 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1150 return (0);
1151}
1152
1153int
1154mm_answer_rsa_response(int socket, Buffer *m)
1155{
1156 Key *key = NULL;
1157 u_char *blob, *response;
1158 u_int blen, len;
1159 int success;
1160
1161 debug3("%s entering", __FUNCTION__);
1162
1163 if (!authctxt->valid)
1164 fatal("%s: authctxt not valid", __FUNCTION__);
1165 if (ssh1_challenge == NULL)
1166 fatal("%s: no ssh1_challenge", __FUNCTION__);
1167
1168 blob = buffer_get_string(m, &blen);
1169 if (!monitor_allowed_key(blob, blen))
1170 fatal("%s: bad key, not previously allowed", __FUNCTION__);
1171 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1172 fatal("%s: key type mismatch: %d", __FUNCTION__, key_blobtype);
1173 if ((key = key_from_blob(blob, blen)) == NULL)
1174 fatal("%s: received bad key", __FUNCTION__);
1175 response = buffer_get_string(m, &len);
1176 if (len != 16)
1177 fatal("%s: received bad response to challenge", __FUNCTION__);
1178 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1179
1180 key_free(key);
1181 xfree(response);
1182
1183 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1184
1185 /* reset state */
1186 BN_clear_free(ssh1_challenge);
1187 ssh1_challenge = NULL;
1188 monitor_reset_key_state();
1189
1190 buffer_clear(m);
1191 buffer_put_int(m, success);
1192 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1193
1194 return (success);
1195}
1196
1197int
1198mm_answer_term(int socket, Buffer *req)
1199{
1200 extern struct monitor *monitor;
1201 int res, status;
1202
1203 debug3("%s: tearing down sessions", __FUNCTION__);
1204
1205 /* The child is terminating */
1206 session_destroy_all(&mm_session_close);
1207
1208 if (waitpid(monitor->m_pid, &status, 0) == -1)
1209 exit(1);
1210
1211 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1212
1213 /* Terminate process */
1214 exit (res);
1215}
1216
1217void
1218monitor_apply_keystate(struct monitor *monitor)
1219{
1220 if (compat20) {
1221 set_newkeys(MODE_IN);
1222 set_newkeys(MODE_OUT);
1223 } else {
1224 u_char key[SSH_SESSION_KEY_LENGTH];
1225
1226 memset(key, 'a', sizeof(key));
1227 packet_set_protocol_flags(child_state.ssh1protoflags);
1228 packet_set_encryption_key(key, SSH_SESSION_KEY_LENGTH,
1229 child_state.ssh1cipher);
1230 }
1231
1232 packet_set_keycontext(MODE_OUT, child_state.keyout);
1233 xfree(child_state.keyout);
1234 packet_set_keycontext(MODE_IN, child_state.keyin);
1235 xfree(child_state.keyin);
1236
1237 if (!compat20) {
1238 packet_set_iv(MODE_OUT, child_state.ivout);
1239 xfree(child_state.ivout);
1240 packet_set_iv(MODE_IN, child_state.ivin);
1241 xfree(child_state.ivin);
1242 }
1243
1244 memcpy(&incoming_stream, &child_state.incoming,
1245 sizeof(incoming_stream));
1246 memcpy(&outgoing_stream, &child_state.outgoing,
1247 sizeof(outgoing_stream));
1248
1249 /* Update with new address */
1250 mm_init_compression(monitor->m_zlib);
1251
1252 /* Network I/O buffers */
1253 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1254 buffer_clear(&input);
1255 buffer_append(&input, child_state.input, child_state.ilen);
1256 memset(child_state.input, 0, child_state.ilen);
1257 xfree(child_state.input);
1258
1259 buffer_clear(&output);
1260 buffer_append(&output, child_state.output, child_state.olen);
1261 memset(child_state.output, 0, child_state.olen);
1262 xfree(child_state.output);
1263}
1264
1265static Kex *
1266mm_get_kex(Buffer *m)
1267{
1268 Kex *kex;
1269 void *blob;
1270 u_int bloblen;
1271
1272 kex = xmalloc(sizeof(*kex));
1273 memset(kex, 0, sizeof(*kex));
1274 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1275 kex->we_need = buffer_get_int(m);
1276 kex->server = 1;
1277 kex->hostkey_type = buffer_get_int(m);
1278 kex->kex_type = buffer_get_int(m);
1279 blob = buffer_get_string(m, &bloblen);
1280 buffer_init(&kex->my);
1281 buffer_append(&kex->my, blob, bloblen);
1282 xfree(blob);
1283 blob = buffer_get_string(m, &bloblen);
1284 buffer_init(&kex->peer);
1285 buffer_append(&kex->peer, blob, bloblen);
1286 xfree(blob);
1287 kex->done = 1;
1288 kex->flags = buffer_get_int(m);
1289 kex->client_version_string = buffer_get_string(m, NULL);
1290 kex->server_version_string = buffer_get_string(m, NULL);
1291 kex->load_host_key=&get_hostkey_by_type;
1292 kex->host_key_index=&get_hostkey_index;
1293
1294 return (kex);
1295}
1296
1297/* This function requries careful sanity checking */
1298
1299void
1300mm_get_keystate(struct monitor *monitor)
1301{
1302 Buffer m;
1303 u_char *blob, *p;
1304 u_int bloblen, plen;
1305
1306 debug3("%s: Waiting for new keys", __FUNCTION__);
1307
1308 buffer_init(&m);
1309 mm_request_receive_expect(monitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1310 if (!compat20) {
1311 child_state.ssh1protoflags = buffer_get_int(&m);
1312 child_state.ssh1cipher = buffer_get_int(&m);
1313 child_state.ivout = buffer_get_string(&m,
1314 &child_state.ivoutlen);
1315 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1316 goto skip;
1317 } else {
1318 /* Get the Kex for rekeying */
1319 *monitor->m_pkex = mm_get_kex(&m);
1320 }
1321
1322 blob = buffer_get_string(&m, &bloblen);
1323 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1324 xfree(blob);
1325
1326 debug3("%s: Waiting for second key", __FUNCTION__);
1327 blob = buffer_get_string(&m, &bloblen);
1328 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1329 xfree(blob);
1330
1331 /* Now get sequence numbers for the packets */
1332 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1333 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1334
1335 skip:
1336 /* Get the key context */
1337 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1338 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1339
1340 debug3("%s: Getting compression state", __FUNCTION__);
1341 /* Get compression state */
1342 p = buffer_get_string(&m, &plen);
1343 if (plen != sizeof(child_state.outgoing))
1344 fatal("%s: bad request size", __FUNCTION__);
1345 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1346 xfree(p);
1347
1348 p = buffer_get_string(&m, &plen);
1349 if (plen != sizeof(child_state.incoming))
1350 fatal("%s: bad request size", __FUNCTION__);
1351 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1352 xfree(p);
1353
1354 /* Network I/O buffers */
1355 debug3("%s: Getting Network I/O buffers", __FUNCTION__);
1356 child_state.input = buffer_get_string(&m, &child_state.ilen);
1357 child_state.output = buffer_get_string(&m, &child_state.olen);
1358
1359 buffer_free(&m);
1360}
1361
1362
1363/* Allocation functions for zlib */
1364void *
1365mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1366{
1367 void *address;
1368
1369 address = mm_malloc(mm, size * ncount);
1370
1371 return (address);
1372}
1373
1374void
1375mm_zfree(struct mm_master *mm, void *address)
1376{
1377 mm_free(mm, address);
1378}
1379
1380void
1381mm_init_compression(struct mm_master *mm)
1382{
1383 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1384 outgoing_stream.zfree = (free_func)mm_zfree;
1385 outgoing_stream.opaque = mm;
1386
1387 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1388 incoming_stream.zfree = (free_func)mm_zfree;
1389 incoming_stream.opaque = mm;
1390}
1391
1392/* XXX */
1393
1394#define FD_CLOSEONEXEC(x) do { \
1395 if (fcntl(x, F_SETFD, 1) == -1) \
1396 fatal("fcntl(%d, F_SETFD)", x); \
1397} while (0)
1398
1399static void
1400monitor_socketpair(int *pair)
1401{
1402 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1403 fatal("%s: socketpair", __FUNCTION__);
1404 FD_CLOSEONEXEC(pair[0]);
1405 FD_CLOSEONEXEC(pair[1]);
1406}
1407
1408#define MM_MEMSIZE 65536
1409
1410struct monitor *
1411monitor_init(void)
1412{
1413 struct monitor *mon;
1414 int pair[2];
1415
1416 mon = xmalloc(sizeof(*mon));
1417
1418 monitor_socketpair(pair);
1419
1420 mon->m_recvfd = pair[0];
1421 mon->m_sendfd = pair[1];
1422
1423 /* Used to share zlib space across processes */
1424 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1425 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1426
1427 /* Compression needs to share state across borders */
1428 mm_init_compression(mon->m_zlib);
1429
1430 return mon;
1431}
1432
1433void
1434monitor_reinit(struct monitor *mon)
1435{
1436 int pair[2];
1437
1438 monitor_socketpair(pair);
1439
1440 mon->m_recvfd = pair[0];
1441 mon->m_sendfd = pair[1];
1442}
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