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