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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"
28RCSID("$OpenBSD: monitor.c,v 1.6 2002/03/21 18:38:33 stevesk Exp $");
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
352 fatal("%s: unsupported request: %d\n", __FUNCTION__, type);
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);
497 buffer_put_cstring(m, pwent->pw_class);
498 buffer_put_cstring(m, pwent->pw_dir);
499 buffer_put_cstring(m, pwent->pw_shell);
500
501 out:
502 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __FUNCTION__, allowed);
503 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
504
505 /* For SSHv1 allow authentication now */
506 if (!compat20)
507 monitor_permit_authentications(1);
508 else
509 /* Allow service/style information on the auth context */
510 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
511
512
513 return (0);
514}
515
516int
517mm_answer_authserv(int socket, Buffer *m)
518{
519 monitor_permit_authentications(1);
520
521 authctxt->service = buffer_get_string(m, NULL);
522 authctxt->style = buffer_get_string(m, NULL);
523 debug3("%s: service=%s, style=%s",
524 __FUNCTION__, authctxt->service, authctxt->style);
525
526 if (strlen(authctxt->style) == 0) {
527 xfree(authctxt->style);
528 authctxt->style = NULL;
529 }
530
531 return (0);
532}
533
534int
535mm_answer_authpassword(int socket, Buffer *m)
536{
537 static int call_count;
538 char *passwd;
539 int authenticated, plen;
540
541 passwd = buffer_get_string(m, &plen);
542 /* Only authenticate if the context is valid */
543 authenticated = authctxt->valid && auth_password(authctxt, passwd);
544 memset(passwd, 0, strlen(passwd));
545 xfree(passwd);
546
547 buffer_clear(m);
548 buffer_put_int(m, authenticated);
549
550 debug3("%s: sending result %d", __FUNCTION__, authenticated);
551 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
552
553 call_count++;
554 if (plen == 0 && call_count == 1)
555 auth_method = "none";
556 else
557 auth_method = "password";
558
559 /* Causes monitor loop to terminate if authenticated */
560 return (authenticated);
561}
562
563#ifdef BSD_AUTH
564int
565mm_answer_bsdauthquery(int socket, Buffer *m)
566{
567 char *name, *infotxt;
568 u_int numprompts;
569 u_int *echo_on;
570 char **prompts;
571 int res;
572
573 res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
574 &prompts, &echo_on);
575
576 buffer_clear(m);
577 buffer_put_int(m, res);
578 if (res != -1)
579 buffer_put_cstring(m, prompts[0]);
580
581 debug3("%s: sending challenge res: %d", __FUNCTION__, res);
582 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
583
584 if (res != -1) {
585 xfree(name);
586 xfree(infotxt);
587 xfree(prompts);
588 xfree(echo_on);
589 }
590
591 return (0);
592}
593
594int
595mm_answer_bsdauthrespond(int socket, Buffer *m)
596{
597 char *response;
598 int authok;
599
600 if (authctxt->as == 0)
601 fatal("%s: no bsd auth session", __FUNCTION__);
602
603 response = buffer_get_string(m, NULL);
604 authok = auth_userresponse(authctxt->as, response, 0);
605 authctxt->as = NULL;
606 debug3("%s: <%s> = <%d>", __FUNCTION__, response, authok);
607 xfree(response);
608
609 buffer_clear(m);
610 buffer_put_int(m, authok);
611
612 debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
613 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
614
615 auth_method = "bsdauth";
616
617 return (authok != 0);
618}
619#endif
620
621#ifdef SKEY
622int
623mm_answer_skeyquery(int socket, Buffer *m)
624{
625 struct skey skey;
626 char challenge[1024];
627 int res;
628
629 res = skeychallenge(&skey, authctxt->user, challenge);
630
631 buffer_clear(m);
632 buffer_put_int(m, res);
633 if (res != -1)
634 buffer_put_cstring(m, challenge);
635
636 debug3("%s: sending challenge res: %d", __FUNCTION__, res);
637 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
638
639 return (0);
640}
641
642int
643mm_answer_skeyrespond(int socket, Buffer *m)
644{
645 char *response;
646 int authok;
647
648 response = buffer_get_string(m, NULL);
649
650 authok = (authctxt->valid &&
651 skey_haskey(authctxt->pw->pw_name) == 0 &&
652 skey_passcheck(authctxt->pw->pw_name, response) != -1);
653
654 xfree(response);
655
656 buffer_clear(m);
657 buffer_put_int(m, authok);
658
659 debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
660 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
661
662 auth_method = "skey";
663
664 return (authok != 0);
665}
666#endif
667
668static void
669mm_append_debug(Buffer *m)
670{
671 if (auth_debug_init && buffer_len(&auth_debug)) {
672 debug3("%s: Appending debug messages for child", __FUNCTION__);
673 buffer_append(m, buffer_ptr(&auth_debug),
674 buffer_len(&auth_debug));
675 buffer_clear(&auth_debug);
676 }
677}
678
679int
680mm_answer_keyallowed(int socket, Buffer *m)
681{
682 Key *key;
683 u_char *cuser, *chost, *blob;
684 u_int bloblen;
685 enum mm_keytype type = 0;
686 int allowed = 0;
687
688 debug3("%s entering", __FUNCTION__);
689
690 type = buffer_get_int(m);
691 cuser = buffer_get_string(m, NULL);
692 chost = buffer_get_string(m, NULL);
693 blob = buffer_get_string(m, &bloblen);
694
695 key = key_from_blob(blob, bloblen);
696
697 if ((compat20 && type == MM_RSAHOSTKEY) ||
698 (!compat20 && type != MM_RSAHOSTKEY))
699 fatal("%s: key type and protocol mismatch", __FUNCTION__);
700
701 debug3("%s: key_from_blob: %p", __FUNCTION__, key);
702
703 if (key != NULL && authctxt->pw != NULL) {
704 switch(type) {
705 case MM_USERKEY:
706 allowed = user_key_allowed(authctxt->pw, key);
707 break;
708 case MM_HOSTKEY:
709 allowed = hostbased_key_allowed(authctxt->pw,
710 cuser, chost, key);
711 break;
712 case MM_RSAHOSTKEY:
713 key->type = KEY_RSA1; /* XXX */
714 allowed = auth_rhosts_rsa_key_allowed(authctxt->pw,
715 cuser, chost, key);
716 break;
717 default:
718 fatal("%s: unknown key type %d", __FUNCTION__, type);
719 break;
720 }
721 key_free(key);
722 }
723
724 /* clear temporarily storage (used by verify) */
725 monitor_reset_key_state();
726
727 if (allowed) {
728 /* Save temporarily for comparison in verify */
729 key_blob = blob;
730 key_bloblen = bloblen;
731 key_blobtype = type;
732 hostbased_cuser = cuser;
733 hostbased_chost = chost;
734 }
735
736 debug3("%s: key %p is %s",
737 __FUNCTION__, key, allowed ? "allowed" : "disallowed");
738
739 buffer_clear(m);
740 buffer_put_int(m, allowed);
741
742 mm_append_debug(m);
743
744 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
745
746 if (type == MM_RSAHOSTKEY)
747 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
748
749 return (0);
750}
751
752static int
753monitor_valid_userblob(u_char *data, u_int datalen)
754{
755 Buffer b;
756 u_char *p;
757 u_int len;
758 int fail = 0;
759 int session_id2_len = 20 /*XXX should get from [net] */;
760
761 buffer_init(&b);
762 buffer_append(&b, data, datalen);
763
764 if (datafellows & SSH_OLD_SESSIONID) {
765 buffer_consume(&b, session_id2_len);
766 } else {
767 xfree(buffer_get_string(&b, &len));
768 if (len != session_id2_len)
769 fail++;
770 }
771 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
772 fail++;
773 p = buffer_get_string(&b, NULL);
774 if (strcmp(authctxt->user, p) != 0) {
775 log("wrong user name passed to monitor: expected %s != %.100s",
776 authctxt->user, p);
777 fail++;
778 }
779 xfree(p);
780 buffer_skip_string(&b);
781 if (datafellows & SSH_BUG_PKAUTH) {
782 if (!buffer_get_char(&b))
783 fail++;
784 } else {
785 p = buffer_get_string(&b, NULL);
786 if (strcmp("publickey", p) != 0)
787 fail++;
788 xfree(p);
789 if (!buffer_get_char(&b))
790 fail++;
791 buffer_skip_string(&b);
792 }
793 buffer_skip_string(&b);
794 if (buffer_len(&b) != 0)
795 fail++;
796 buffer_free(&b);
797 return (fail == 0);
798}
799
800static int
801monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
802 u_char *chost)
803{
804 Buffer b;
805 u_char *p;
806 u_int len;
807 int fail = 0;
808 int session_id2_len = 20 /*XXX should get from [net] */;
809
810 buffer_init(&b);
811 buffer_append(&b, data, datalen);
812
813 xfree(buffer_get_string(&b, &len));
814 if (len != session_id2_len)
815 fail++;
816 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
817 fail++;
818 p = buffer_get_string(&b, NULL);
819 if (strcmp(authctxt->user, p) != 0) {
820 log("wrong user name passed to monitor: expected %s != %.100s",
821 authctxt->user, p);
822 fail++;
823 }
824 xfree(p);
825 buffer_skip_string(&b); /* service */
826 p = buffer_get_string(&b, NULL);
827 if (strcmp(p, "hostbased") != 0)
828 fail++;
829 xfree(p);
830 buffer_skip_string(&b); /* pkalg */
831 buffer_skip_string(&b); /* pkblob */
832
833 /* verify client host, strip trailing dot if necessary */
834 p = buffer_get_string(&b, NULL);
835 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
836 p[len - 1] = '\0';
837 if (strcmp(p, chost) != 0)
838 fail++;
839 xfree(p);
840
841 /* verify client user */
842 p = buffer_get_string(&b, NULL);
843 if (strcmp(p, cuser) != 0)
844 fail++;
845 xfree(p);
846
847 if (buffer_len(&b) != 0)
848 fail++;
849 buffer_free(&b);
850 return (fail == 0);
851}
852
853int
854mm_answer_keyverify(int socket, Buffer *m)
855{
856 Key *key;
857 u_char *signature, *data, *blob;
858 u_int signaturelen, datalen, bloblen;
859 int verified = 0;
860 int valid_data = 0;
861
862 blob = buffer_get_string(m, &bloblen);
863 signature = buffer_get_string(m, &signaturelen);
864 data = buffer_get_string(m, &datalen);
865
866 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
867 monitor_allowed_key(blob, bloblen) == NULL)
868 fatal("%s: bad key, not previously allowed", __FUNCTION__);
869
870 key = key_from_blob(blob, bloblen);
871 if (key == NULL)
872 fatal("%s: bad public key blob", __FUNCTION__);
873
874 switch (key_blobtype) {
875 case MM_USERKEY:
876 valid_data = monitor_valid_userblob(data, datalen);
877 break;
878 case MM_HOSTKEY:
879 valid_data = monitor_valid_hostbasedblob(data, datalen,
880 hostbased_cuser, hostbased_chost);
881 break;
882 default:
883 valid_data = 0;
884 break;
885 }
886 if (!valid_data)
887 fatal("%s: bad signature data blob", __FUNCTION__);
888
889 verified = key_verify(key, signature, signaturelen, data, datalen);
890 debug3("%s: key %p signature %s",
891 __FUNCTION__, key, verified ? "verified" : "unverified");
892
893 key_free(key);
894 xfree(blob);
895 xfree(signature);
896 xfree(data);
897
898 monitor_reset_key_state();
899
900 buffer_clear(m);
901 buffer_put_int(m, verified);
902 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
903
904 auth_method = "publickey";
905
906 return (verified);
907}
908
909static void
910mm_record_login(Session *s, struct passwd *pw)
911{
912 socklen_t fromlen;
913 struct sockaddr_storage from;
914
915 /*
916 * Get IP address of client. If the connection is not a socket, let
917 * the address be 0.0.0.0.
918 */
919 memset(&from, 0, sizeof(from));
920 if (packet_connection_is_on_socket()) {
921 fromlen = sizeof(from);
922 if (getpeername(packet_get_connection_in(),
923 (struct sockaddr *) & from, &fromlen) < 0) {
924 debug("getpeername: %.100s", strerror(errno));
925 fatal_cleanup();
926 }
927 }
928 /* Record that there was a login on that tty from the remote host. */
929 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
930 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
931 (struct sockaddr *)&from);
932}
933
934static void
935mm_session_close(Session *s)
936{
937 debug3("%s: session %d pid %d", __FUNCTION__, s->self, s->pid);
938 if (s->ttyfd != -1) {
939 debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ptyfd);
940 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
941 session_pty_cleanup2(s);
942 }
943 s->used = 0;
944}
945
946int
947mm_answer_pty(int socket, Buffer *m)
948{
949 extern struct monitor *monitor;
950 Session *s;
951 int res, fd0;
952
953 debug3("%s entering", __FUNCTION__);
954
955 buffer_clear(m);
956 s = session_new();
957 if (s == NULL)
958 goto error;
959 s->authctxt = authctxt;
960 s->pw = authctxt->pw;
961 s->pid = monitor->m_pid;
962 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
963 if (res == 0)
964 goto error;
965 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
966 pty_setowner(authctxt->pw, s->tty);
967
968 buffer_put_int(m, 1);
969 buffer_put_cstring(m, s->tty);
970 mm_request_send(socket, MONITOR_ANS_PTY, m);
971
972 mm_send_fd(socket, s->ptyfd);
973 mm_send_fd(socket, s->ttyfd);
974
975 /* We need to trick ttyslot */
976 if (dup2(s->ttyfd, 0) == -1)
977 fatal("%s: dup2", __FUNCTION__);
978
979 mm_record_login(s, authctxt->pw);
980
981 /* Now we can close the file descriptor again */
982 close(0);
983
984 /* make sure nothing uses fd 0 */
985 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
986 fatal("%s: open(/dev/null): %s", __FUNCTION__, strerror(errno));
987 if (fd0 != 0)
988 error("%s: fd0 %d != 0", __FUNCTION__, fd0);
989
990 /* slave is not needed */
991 close(s->ttyfd);
992 s->ttyfd = s->ptyfd;
993 /* no need to dup() because nobody closes ptyfd */
994 s->ptymaster = s->ptyfd;
995
996 debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ttyfd);
997
998 return (0);
999
1000 error:
1001 if (s != NULL)
1002 mm_session_close(s);
1003 buffer_put_int(m, 0);
1004 mm_request_send(socket, MONITOR_ANS_PTY, m);
1005 return (0);
1006}
1007
1008int
1009mm_answer_pty_cleanup(int socket, Buffer *m)
1010{
1011 Session *s;
1012 char *tty;
1013
1014 debug3("%s entering", __FUNCTION__);
1015
1016 tty = buffer_get_string(m, NULL);
1017 if ((s = session_by_tty(tty)) != NULL)
1018 mm_session_close(s);
1019 buffer_clear(m);
1020 xfree(tty);
1021 return (0);
1022}
1023
1024int
1025mm_answer_sesskey(int socket, Buffer *m)
1026{
1027 BIGNUM *p;
1028 int rsafail;
1029
1030 /* Turn off permissions */
1031 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1032
1033 if ((p = BN_new()) == NULL)
1034 fatal("%s: BN_new", __FUNCTION__);
1035
1036 buffer_get_bignum2(m, p);
1037
1038 rsafail = ssh1_session_key(p);
1039
1040 buffer_clear(m);
1041 buffer_put_int(m, rsafail);
1042 buffer_put_bignum2(m, p);
1043
1044 BN_clear_free(p);
1045
1046 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1047
1048 /* Turn on permissions for sessid passing */
1049 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1050
1051 return (0);
1052}
1053
1054int
1055mm_answer_sessid(int socket, Buffer *m)
1056{
1057 int i;
1058
1059 debug3("%s entering", __FUNCTION__);
1060
1061 if (buffer_len(m) != 16)
1062 fatal("%s: bad ssh1 session id", __FUNCTION__);
1063 for (i = 0; i < 16; i++)
1064 session_id[i] = buffer_get_char(m);
1065
1066 /* Turn on permissions for getpwnam */
1067 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1068
1069 return (0);
1070}
1071
1072int
1073mm_answer_rsa_keyallowed(int socket, Buffer *m)
1074{
1075 BIGNUM *client_n;
1076 Key *key = NULL;
1077 u_char *blob = NULL;
1078 u_int blen = 0;
1079 int allowed = 0;
1080
1081 debug3("%s entering", __FUNCTION__);
1082
1083 if (authctxt->valid) {
1084 if ((client_n = BN_new()) == NULL)
1085 fatal("%s: BN_new", __FUNCTION__);
1086 buffer_get_bignum2(m, client_n);
1087 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1088 BN_clear_free(client_n);
1089 }
1090 buffer_clear(m);
1091 buffer_put_int(m, allowed);
1092
1093 /* clear temporarily storage (used by generate challenge) */
1094 monitor_reset_key_state();
1095
1096 if (allowed && key != NULL) {
1097 key->type = KEY_RSA; /* cheat for key_to_blob */
1098 if (key_to_blob(key, &blob, &blen) == 0)
1099 fatal("%s: key_to_blob failed", __FUNCTION__);
1100 buffer_put_string(m, blob, blen);
1101
1102 /* Save temporarily for comparison in verify */
1103 key_blob = blob;
1104 key_bloblen = blen;
1105 key_blobtype = MM_RSAUSERKEY;
1106 key_free(key);
1107 }
1108
1109 mm_append_debug(m);
1110
1111 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1112
1113 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1114 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1115 return (0);
1116}
1117
1118int
1119mm_answer_rsa_challenge(int socket, Buffer *m)
1120{
1121 Key *key = NULL;
1122 u_char *blob;
1123 u_int blen;
1124
1125 debug3("%s entering", __FUNCTION__);
1126
1127 if (!authctxt->valid)
1128 fatal("%s: authctxt not valid", __FUNCTION__);
1129 blob = buffer_get_string(m, &blen);
1130 if (!monitor_allowed_key(blob, blen))
1131 fatal("%s: bad key, not previously allowed", __FUNCTION__);
1132 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1133 fatal("%s: key type mismatch", __FUNCTION__);
1134 if ((key = key_from_blob(blob, blen)) == NULL)
1135 fatal("%s: received bad key", __FUNCTION__);
1136
1137 if (ssh1_challenge)
1138 BN_clear_free(ssh1_challenge);
1139 ssh1_challenge = auth_rsa_generate_challenge(key);
1140
1141 buffer_clear(m);
1142 buffer_put_bignum2(m, ssh1_challenge);
1143
1144 debug3("%s sending reply", __FUNCTION__);
1145 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1146
1147 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1148 return (0);
1149}
1150
1151int
1152mm_answer_rsa_response(int socket, Buffer *m)
1153{
1154 Key *key = NULL;
1155 u_char *blob, *response;
1156 u_int blen, len;
1157 int success;
1158
1159 debug3("%s entering", __FUNCTION__);
1160
1161 if (!authctxt->valid)
1162 fatal("%s: authctxt not valid", __FUNCTION__);
1163 if (ssh1_challenge == NULL)
1164 fatal("%s: no ssh1_challenge", __FUNCTION__);
1165
1166 blob = buffer_get_string(m, &blen);
1167 if (!monitor_allowed_key(blob, blen))
1168 fatal("%s: bad key, not previously allowed", __FUNCTION__);
1169 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1170 fatal("%s: key type mismatch: %d", __FUNCTION__, key_blobtype);
1171 if ((key = key_from_blob(blob, blen)) == NULL)
1172 fatal("%s: received bad key", __FUNCTION__);
1173 response = buffer_get_string(m, &len);
1174 if (len != 16)
1175 fatal("%s: received bad response to challenge", __FUNCTION__);
1176 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1177
1178 key_free(key);
1179 xfree(response);
1180
1181 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1182
1183 /* reset state */
1184 BN_clear_free(ssh1_challenge);
1185 ssh1_challenge = NULL;
1186 monitor_reset_key_state();
1187
1188 buffer_clear(m);
1189 buffer_put_int(m, success);
1190 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1191
1192 return (success);
1193}
1194
1195int
1196mm_answer_term(int socket, Buffer *req)
1197{
1198 extern struct monitor *monitor;
1199 int res, status;
1200
1201 debug3("%s: tearing down sessions", __FUNCTION__);
1202
1203 /* The child is terminating */
1204 session_destroy_all(&mm_session_close);
1205
1206 if (waitpid(monitor->m_pid, &status, 0) == -1)
1207 exit(1);
1208
1209 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1210
1211 /* Terminate process */
1212 exit (res);
1213}
1214
1215void
1216monitor_apply_keystate(struct monitor *monitor)
1217{
1218 if (compat20) {
1219 set_newkeys(MODE_IN);
1220 set_newkeys(MODE_OUT);
1221 } else {
1222 u_char key[SSH_SESSION_KEY_LENGTH];
1223
1224 memset(key, 'a', sizeof(key));
1225 packet_set_protocol_flags(child_state.ssh1protoflags);
1226 packet_set_encryption_key(key, SSH_SESSION_KEY_LENGTH,
1227 child_state.ssh1cipher);
1228 }
1229
1230 packet_set_keycontext(MODE_OUT, child_state.keyout);
1231 xfree(child_state.keyout);
1232 packet_set_keycontext(MODE_IN, child_state.keyin);
1233 xfree(child_state.keyin);
1234
1235 if (!compat20) {
1236 packet_set_iv(MODE_OUT, child_state.ivout);
1237 xfree(child_state.ivout);
1238 packet_set_iv(MODE_IN, child_state.ivin);
1239 xfree(child_state.ivin);
1240 }
1241
1242 memcpy(&incoming_stream, &child_state.incoming,
1243 sizeof(incoming_stream));
1244 memcpy(&outgoing_stream, &child_state.outgoing,
1245 sizeof(outgoing_stream));
1246
1247 /* Update with new address */
1248 mm_init_compression(monitor->m_zlib);
1249
1250 /* Network I/O buffers */
1251 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1252 buffer_clear(&input);
1253 buffer_append(&input, child_state.input, child_state.ilen);
1254 memset(child_state.input, 0, child_state.ilen);
1255 xfree(child_state.input);
1256
1257 buffer_clear(&output);
1258 buffer_append(&output, child_state.output, child_state.olen);
1259 memset(child_state.output, 0, child_state.olen);
1260 xfree(child_state.output);
1261}
1262
1263static Kex *
1264mm_get_kex(Buffer *m)
1265{
1266 Kex *kex;
1267 void *blob;
1268 u_int bloblen;
1269
1270 kex = xmalloc(sizeof(*kex));
1271 memset(kex, 0, sizeof(*kex));
1272 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1273 kex->we_need = buffer_get_int(m);
1274 kex->server = 1;
1275 kex->hostkey_type = buffer_get_int(m);
1276 kex->kex_type = buffer_get_int(m);
1277 blob = buffer_get_string(m, &bloblen);
1278 buffer_init(&kex->my);
1279 buffer_append(&kex->my, blob, bloblen);
1280 xfree(blob);
1281 blob = buffer_get_string(m, &bloblen);
1282 buffer_init(&kex->peer);
1283 buffer_append(&kex->peer, blob, bloblen);
1284 xfree(blob);
1285 kex->done = 1;
1286 kex->flags = buffer_get_int(m);
1287 kex->client_version_string = buffer_get_string(m, NULL);
1288 kex->server_version_string = buffer_get_string(m, NULL);
1289 kex->load_host_key=&get_hostkey_by_type;
1290 kex->host_key_index=&get_hostkey_index;
1291
1292 return (kex);
1293}
1294
1295/* This function requries careful sanity checking */
1296
1297void
1298mm_get_keystate(struct monitor *monitor)
1299{
1300 Buffer m;
1301 u_char *blob, *p;
1302 u_int bloblen, plen;
1303
1304 debug3("%s: Waiting for new keys", __FUNCTION__);
1305
1306 buffer_init(&m);
1307 mm_request_receive_expect(monitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1308 if (!compat20) {
1309 child_state.ssh1protoflags = buffer_get_int(&m);
1310 child_state.ssh1cipher = buffer_get_int(&m);
1311 child_state.ivout = buffer_get_string(&m,
1312 &child_state.ivoutlen);
1313 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1314 goto skip;
1315 } else {
1316 /* Get the Kex for rekeying */
1317 *monitor->m_pkex = mm_get_kex(&m);
1318 }
1319
1320 blob = buffer_get_string(&m, &bloblen);
1321 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1322 xfree(blob);
1323
1324 debug3("%s: Waiting for second key", __FUNCTION__);
1325 blob = buffer_get_string(&m, &bloblen);
1326 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1327 xfree(blob);
1328
1329 /* Now get sequence numbers for the packets */
1330 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1331 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1332
1333 skip:
1334 /* Get the key context */
1335 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1336 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1337
1338 debug3("%s: Getting compression state", __FUNCTION__);
1339 /* Get compression state */
1340 p = buffer_get_string(&m, &plen);
1341 if (plen != sizeof(child_state.outgoing))
1342 fatal("%s: bad request size", __FUNCTION__);
1343 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1344 xfree(p);
1345
1346 p = buffer_get_string(&m, &plen);
1347 if (plen != sizeof(child_state.incoming))
1348 fatal("%s: bad request size", __FUNCTION__);
1349 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1350 xfree(p);
1351
1352 /* Network I/O buffers */
1353 debug3("%s: Getting Network I/O buffers", __FUNCTION__);
1354 child_state.input = buffer_get_string(&m, &child_state.ilen);
1355 child_state.output = buffer_get_string(&m, &child_state.olen);
1356
1357 buffer_free(&m);
1358}
1359
1360
1361/* Allocation functions for zlib */
1362void *
1363mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1364{
1365 void *address;
1366
1367 address = mm_malloc(mm, size * ncount);
1368
1369 return (address);
1370}
1371
1372void
1373mm_zfree(struct mm_master *mm, void *address)
1374{
1375 mm_free(mm, address);
1376}
1377
1378void
1379mm_init_compression(struct mm_master *mm)
1380{
1381 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1382 outgoing_stream.zfree = (free_func)mm_zfree;
1383 outgoing_stream.opaque = mm;
1384
1385 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1386 incoming_stream.zfree = (free_func)mm_zfree;
1387 incoming_stream.opaque = mm;
1388}
1389
1390/* XXX */
1391
1392#define FD_CLOSEONEXEC(x) do { \
1393 if (fcntl(x, F_SETFD, 1) == -1) \
1394 fatal("fcntl(%d, F_SETFD)", x); \
1395} while (0)
1396
1397static void
1398monitor_socketpair(int *pair)
1399{
1400 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1401 fatal("%s: socketpair", __FUNCTION__);
1402 FD_CLOSEONEXEC(pair[0]);
1403 FD_CLOSEONEXEC(pair[1]);
1404}
1405
1406#define MM_MEMSIZE 65536
1407
1408struct monitor *
1409monitor_init(void)
1410{
1411 struct monitor *mon;
1412 int pair[2];
1413
1414 mon = xmalloc(sizeof(*mon));
1415
1416 monitor_socketpair(pair);
1417
1418 mon->m_recvfd = pair[0];
1419 mon->m_sendfd = pair[1];
1420
1421 /* Used to share zlib space across processes */
1422 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1423 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1424
1425 /* Compression needs to share state across borders */
1426 mm_init_compression(mon->m_zlib);
1427
1428 return mon;
1429}
1430
1431void
1432monitor_reinit(struct monitor *mon)
1433{
1434 int pair[2];
1435
1436 monitor_socketpair(pair);
1437
1438 mon->m_recvfd = pair[0];
1439 mon->m_sendfd = pair[1];
1440}
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