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- markus@cvs.openbsd.org 2002/05/13 21:26:49
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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"
94a73cdc 28RCSID("$OpenBSD: monitor.c,v 1.10 2002/05/12 23:53:45 djm 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 *);
94a73cdc 99int mm_answer_auth2_read_banner(int, Buffer *);
1853d1ef 100int mm_answer_authserv(int, Buffer *);
101int mm_answer_authpassword(int, Buffer *);
102int mm_answer_bsdauthquery(int, Buffer *);
103int mm_answer_bsdauthrespond(int, Buffer *);
104int mm_answer_skeyquery(int, Buffer *);
105int mm_answer_skeyrespond(int, Buffer *);
106int mm_answer_keyallowed(int, Buffer *);
107int mm_answer_keyverify(int, Buffer *);
108int mm_answer_pty(int, Buffer *);
109int mm_answer_pty_cleanup(int, Buffer *);
110int mm_answer_term(int, Buffer *);
111int mm_answer_rsa_keyallowed(int, Buffer *);
112int mm_answer_rsa_challenge(int, Buffer *);
113int mm_answer_rsa_response(int, Buffer *);
114int mm_answer_sesskey(int, Buffer *);
115int mm_answer_sessid(int, Buffer *);
116
ad200abb 117#ifdef USE_PAM
118int mm_answer_pam_start(int, Buffer *);
119#endif
120
1853d1ef 121static Authctxt *authctxt;
122static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
123
124/* local state for key verify */
125static u_char *key_blob = NULL;
126static u_int key_bloblen = 0;
127static int key_blobtype = MM_NOKEY;
128static u_char *hostbased_cuser = NULL;
129static u_char *hostbased_chost = NULL;
130static char *auth_method = "unknown";
131
132struct mon_table {
133 enum monitor_reqtype type;
134 int flags;
135 int (*f)(int, Buffer *);
136};
137
138#define MON_ISAUTH 0x0004 /* Required for Authentication */
139#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
140#define MON_ONCE 0x0010 /* Disable after calling */
141
142#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
143
144#define MON_PERMIT 0x1000 /* Request is permitted */
145
146struct mon_table mon_dispatch_proto20[] = {
147 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
148 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
149 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
150 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
94a73cdc 151 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1853d1ef 152 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
ad200abb 153#ifdef USE_PAM
154 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
8b314ec9 155#endif
1853d1ef 156#ifdef BSD_AUTH
157 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
158 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
159#endif
160#ifdef SKEY
161 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
162 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
163#endif
164 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
165 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
166 {0, 0, NULL}
167};
168
169struct mon_table mon_dispatch_postauth20[] = {
170 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
171 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
172 {MONITOR_REQ_PTY, 0, mm_answer_pty},
173 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
174 {MONITOR_REQ_TERM, 0, mm_answer_term},
175 {0, 0, NULL}
176};
177
178struct mon_table mon_dispatch_proto15[] = {
179 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
180 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
181 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
182 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
183 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
184 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
185 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
186 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
efe44db6 187#ifdef USE_PAM
188 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
189#endif
1853d1ef 190#ifdef BSD_AUTH
191 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
192 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
193#endif
194#ifdef SKEY
195 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
196 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
efe44db6 197#endif
198#ifdef USE_PAM
199 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
1853d1ef 200#endif
201 {0, 0, NULL}
202};
203
204struct mon_table mon_dispatch_postauth15[] = {
205 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
206 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
207 {MONITOR_REQ_TERM, 0, mm_answer_term},
208 {0, 0, NULL}
209};
210
211struct mon_table *mon_dispatch;
212
213/* Specifies if a certain message is allowed at the moment */
214
215static void
216monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
217{
218 while (ent->f != NULL) {
219 if (ent->type == type) {
220 ent->flags &= ~MON_PERMIT;
221 ent->flags |= permit ? MON_PERMIT : 0;
222 return;
223 }
224 ent++;
225 }
226}
227
228static void
229monitor_permit_authentications(int permit)
230{
231 struct mon_table *ent = mon_dispatch;
232
233 while (ent->f != NULL) {
234 if (ent->flags & MON_AUTH) {
235 ent->flags &= ~MON_PERMIT;
236 ent->flags |= permit ? MON_PERMIT : 0;
237 }
238 ent++;
239 }
240}
241
242Authctxt *
243monitor_child_preauth(struct monitor *monitor)
244{
245 struct mon_table *ent;
246 int authenticated = 0;
247
248 debug3("preauth child monitor started");
249
250 if (compat20) {
251 mon_dispatch = mon_dispatch_proto20;
252
253 /* Permit requests for moduli and signatures */
254 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
255 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
256 } else {
257 mon_dispatch = mon_dispatch_proto15;
258
259 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
260 }
261
262 authctxt = authctxt_new();
263
264 /* The first few requests do not require asynchronous access */
265 while (!authenticated) {
266 authenticated = monitor_read(monitor, mon_dispatch, &ent);
267 if (authenticated) {
268 if (!(ent->flags & MON_AUTHDECIDE))
269 fatal("%s: unexpected authentication from %d",
270 __FUNCTION__, ent->type);
271 if (authctxt->pw->pw_uid == 0 &&
272 !auth_root_allowed(auth_method))
273 authenticated = 0;
ad200abb 274#ifdef USE_PAM
275 if (!do_pam_account(authctxt->pw->pw_name, NULL))
276 authenticated = 0;
277#endif
1853d1ef 278 }
279
280 if (ent->flags & MON_AUTHDECIDE) {
281 auth_log(authctxt, authenticated, auth_method,
282 compat20 ? " ssh2" : "");
283 if (!authenticated)
284 authctxt->failures++;
285 }
286 }
287
288 if (!authctxt->valid)
289 fatal("%s: authenticated invalid user", __FUNCTION__);
290
291 debug("%s: %s has been authenticated by privileged process",
292 __FUNCTION__, authctxt->user);
293
294 mm_get_keystate(monitor);
295
296 return (authctxt);
297}
298
299void
300monitor_child_postauth(struct monitor *monitor)
301{
302 if (compat20) {
303 mon_dispatch = mon_dispatch_postauth20;
304
305 /* Permit requests for moduli and signatures */
306 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
307 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
308 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
309
310 } else {
311 mon_dispatch = mon_dispatch_postauth15;
312 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
313 }
314 if (!no_pty_flag) {
315 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
316 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
317 }
318
319 for (;;)
320 monitor_read(monitor, mon_dispatch, NULL);
321}
322
323void
324monitor_sync(struct monitor *monitor)
325{
326 /* The member allocation is not visible, so sync it */
327 mm_share_sync(&monitor->m_zlib, &monitor->m_zback);
328}
329
330int
331monitor_read(struct monitor *monitor, struct mon_table *ent,
332 struct mon_table **pent)
333{
334 Buffer m;
335 int ret;
336 u_char type;
337
338 buffer_init(&m);
339
340 mm_request_receive(monitor->m_sendfd, &m);
341 type = buffer_get_char(&m);
342
343 debug3("%s: checking request %d", __FUNCTION__, type);
344
345 while (ent->f != NULL) {
346 if (ent->type == type)
347 break;
348 ent++;
349 }
350
351 if (ent->f != NULL) {
352 if (!(ent->flags & MON_PERMIT))
353 fatal("%s: unpermitted request %d", __FUNCTION__,
354 type);
355 ret = (*ent->f)(monitor->m_sendfd, &m);
356 buffer_free(&m);
357
358 /* The child may use this request only once, disable it */
359 if (ent->flags & MON_ONCE) {
360 debug2("%s: %d used once, disabling now", __FUNCTION__,
361 type);
362 ent->flags &= ~MON_PERMIT;
363 }
364
365 if (pent != NULL)
366 *pent = ent;
367
368 return ret;
369 }
370
38c1c52a 371 fatal("%s: unsupported request: %d", __FUNCTION__, type);
1853d1ef 372
373 /* NOTREACHED */
374 return (-1);
375}
376
377/* allowed key state */
378static int
379monitor_allowed_key(u_char *blob, u_int bloblen)
380{
381 /* make sure key is allowed */
382 if (key_blob == NULL || key_bloblen != bloblen ||
383 memcmp(key_blob, blob, key_bloblen))
384 return (0);
385 return (1);
386}
387
388static void
389monitor_reset_key_state(void)
390{
391 /* reset state */
392 if (key_blob != NULL)
393 xfree(key_blob);
394 if (hostbased_cuser != NULL)
395 xfree(hostbased_cuser);
396 if (hostbased_chost != NULL)
397 xfree(hostbased_chost);
398 key_blob = NULL;
399 key_bloblen = 0;
400 key_blobtype = MM_NOKEY;
401 hostbased_cuser = NULL;
402 hostbased_chost = NULL;
403}
404
405int
406mm_answer_moduli(int socket, Buffer *m)
407{
408 DH *dh;
409 int min, want, max;
410
411 min = buffer_get_int(m);
412 want = buffer_get_int(m);
413 max = buffer_get_int(m);
414
415 debug3("%s: got parameters: %d %d %d",
416 __FUNCTION__, min, want, max);
417 /* We need to check here, too, in case the child got corrupted */
418 if (max < min || want < min || max < want)
419 fatal("%s: bad parameters: %d %d %d",
420 __FUNCTION__, min, want, max);
421
422 buffer_clear(m);
423
424 dh = choose_dh(min, want, max);
425 if (dh == NULL) {
426 buffer_put_char(m, 0);
427 return (0);
428 } else {
429 /* Send first bignum */
430 buffer_put_char(m, 1);
431 buffer_put_bignum2(m, dh->p);
432 buffer_put_bignum2(m, dh->g);
433
434 DH_free(dh);
435 }
436 mm_request_send(socket, MONITOR_ANS_MODULI, m);
437 return (0);
438}
439
440int
441mm_answer_sign(int socket, Buffer *m)
442{
443 Key *key;
444 u_char *p;
445 u_char *signature;
446 u_int siglen, datlen;
447 int keyid;
448
449 debug3("%s", __FUNCTION__);
450
451 keyid = buffer_get_int(m);
452 p = buffer_get_string(m, &datlen);
453
454 if (datlen != 20)
455 fatal("%s: data length incorrect: %d", __FUNCTION__, datlen);
456
457 if ((key = get_hostkey_by_index(keyid)) == NULL)
458 fatal("%s: no hostkey from index %d", __FUNCTION__, keyid);
459 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
460 fatal("%s: key_sign failed", __FUNCTION__);
461
462 debug3("%s: signature %p(%d)", __FUNCTION__, signature, siglen);
463
464 buffer_clear(m);
465 buffer_put_string(m, signature, siglen);
466
467 xfree(p);
468 xfree(signature);
469
470 mm_request_send(socket, MONITOR_ANS_SIGN, m);
471
472 /* Turn on permissions for getpwnam */
473 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
474
475 return (0);
476}
477
478/* Retrieves the password entry and also checks if the user is permitted */
479
480int
481mm_answer_pwnamallow(int socket, Buffer *m)
482{
483 char *login;
484 struct passwd *pwent;
485 int allowed = 0;
486
487 debug3("%s", __FUNCTION__);
488
489 if (authctxt->attempt++ != 0)
490 fatal("%s: multiple attempts for getpwnam", __FUNCTION__);
491
492 login = buffer_get_string(m, NULL);
493
494 pwent = getpwnamallow(login);
495
496 authctxt->user = xstrdup(login);
497 setproctitle("%s [priv]", pwent ? login : "unknown");
498 xfree(login);
499
500 buffer_clear(m);
501
502 if (pwent == NULL) {
503 buffer_put_char(m, 0);
504 goto out;
505 }
506
507 allowed = 1;
508 authctxt->pw = pwent;
509 authctxt->valid = 1;
510
511 buffer_put_char(m, 1);
512 buffer_put_string(m, pwent, sizeof(struct passwd));
513 buffer_put_cstring(m, pwent->pw_name);
514 buffer_put_cstring(m, "*");
515 buffer_put_cstring(m, pwent->pw_gecos);
7b18c353 516#ifdef HAVE_PW_CLASS_IN_PASSWD
1853d1ef 517 buffer_put_cstring(m, pwent->pw_class);
7b18c353 518#endif
1853d1ef 519 buffer_put_cstring(m, pwent->pw_dir);
520 buffer_put_cstring(m, pwent->pw_shell);
521
522 out:
523 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __FUNCTION__, allowed);
524 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
525
526 /* For SSHv1 allow authentication now */
527 if (!compat20)
528 monitor_permit_authentications(1);
94a73cdc 529 else {
1853d1ef 530 /* Allow service/style information on the auth context */
531 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
94a73cdc 532 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
533 }
1853d1ef 534
efe44db6 535#ifdef USE_PAM
536 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
537#endif
1853d1ef 538
539 return (0);
540}
541
94a73cdc 542int mm_answer_auth2_read_banner(int socket, Buffer *m)
543{
544 char *banner;
545
546 buffer_clear(m);
547 banner = auth2_read_banner();
548 buffer_put_cstring(m, banner != NULL ? banner : "");
549 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
550
551 if (banner != NULL)
552 free(banner);
553
554 return (0);
555}
556
1853d1ef 557int
558mm_answer_authserv(int socket, Buffer *m)
559{
560 monitor_permit_authentications(1);
561
562 authctxt->service = buffer_get_string(m, NULL);
563 authctxt->style = buffer_get_string(m, NULL);
564 debug3("%s: service=%s, style=%s",
565 __FUNCTION__, authctxt->service, authctxt->style);
566
567 if (strlen(authctxt->style) == 0) {
568 xfree(authctxt->style);
569 authctxt->style = NULL;
570 }
571
572 return (0);
573}
574
575int
576mm_answer_authpassword(int socket, Buffer *m)
577{
578 static int call_count;
579 char *passwd;
580 int authenticated, plen;
581
582 passwd = buffer_get_string(m, &plen);
583 /* Only authenticate if the context is valid */
584 authenticated = authctxt->valid && auth_password(authctxt, passwd);
585 memset(passwd, 0, strlen(passwd));
586 xfree(passwd);
587
588 buffer_clear(m);
589 buffer_put_int(m, authenticated);
590
591 debug3("%s: sending result %d", __FUNCTION__, authenticated);
592 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
593
594 call_count++;
595 if (plen == 0 && call_count == 1)
596 auth_method = "none";
597 else
598 auth_method = "password";
599
600 /* Causes monitor loop to terminate if authenticated */
601 return (authenticated);
602}
603
604#ifdef BSD_AUTH
605int
606mm_answer_bsdauthquery(int socket, Buffer *m)
607{
608 char *name, *infotxt;
609 u_int numprompts;
610 u_int *echo_on;
611 char **prompts;
612 int res;
613
614 res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
615 &prompts, &echo_on);
616
617 buffer_clear(m);
618 buffer_put_int(m, res);
619 if (res != -1)
620 buffer_put_cstring(m, prompts[0]);
621
622 debug3("%s: sending challenge res: %d", __FUNCTION__, res);
623 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
624
625 if (res != -1) {
626 xfree(name);
627 xfree(infotxt);
628 xfree(prompts);
629 xfree(echo_on);
630 }
631
632 return (0);
633}
634
635int
636mm_answer_bsdauthrespond(int socket, Buffer *m)
637{
638 char *response;
639 int authok;
640
641 if (authctxt->as == 0)
642 fatal("%s: no bsd auth session", __FUNCTION__);
643
644 response = buffer_get_string(m, NULL);
645 authok = auth_userresponse(authctxt->as, response, 0);
646 authctxt->as = NULL;
647 debug3("%s: <%s> = <%d>", __FUNCTION__, response, authok);
648 xfree(response);
649
650 buffer_clear(m);
651 buffer_put_int(m, authok);
652
653 debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
654 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
655
656 auth_method = "bsdauth";
657
658 return (authok != 0);
659}
660#endif
661
662#ifdef SKEY
663int
664mm_answer_skeyquery(int socket, Buffer *m)
665{
666 struct skey skey;
667 char challenge[1024];
668 int res;
669
670 res = skeychallenge(&skey, authctxt->user, challenge);
671
672 buffer_clear(m);
673 buffer_put_int(m, res);
674 if (res != -1)
675 buffer_put_cstring(m, challenge);
676
677 debug3("%s: sending challenge res: %d", __FUNCTION__, res);
678 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
679
680 return (0);
681}
682
683int
684mm_answer_skeyrespond(int socket, Buffer *m)
685{
686 char *response;
687 int authok;
688
689 response = buffer_get_string(m, NULL);
690
691 authok = (authctxt->valid &&
692 skey_haskey(authctxt->pw->pw_name) == 0 &&
693 skey_passcheck(authctxt->pw->pw_name, response) != -1);
694
695 xfree(response);
696
697 buffer_clear(m);
698 buffer_put_int(m, authok);
699
700 debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
701 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
702
703 auth_method = "skey";
704
705 return (authok != 0);
706}
707#endif
708
ad200abb 709#ifdef USE_PAM
710int
711mm_answer_pam_start(int socket, Buffer *m)
712{
713 char *user;
714
715 user = buffer_get_string(m, NULL);
716
717 start_pam(user);
718
719 xfree(user);
720
721 return (0);
722}
723#endif
724
1853d1ef 725static void
726mm_append_debug(Buffer *m)
727{
728 if (auth_debug_init && buffer_len(&auth_debug)) {
729 debug3("%s: Appending debug messages for child", __FUNCTION__);
730 buffer_append(m, buffer_ptr(&auth_debug),
731 buffer_len(&auth_debug));
732 buffer_clear(&auth_debug);
733 }
734}
735
736int
737mm_answer_keyallowed(int socket, Buffer *m)
738{
739 Key *key;
740 u_char *cuser, *chost, *blob;
741 u_int bloblen;
742 enum mm_keytype type = 0;
743 int allowed = 0;
744
745 debug3("%s entering", __FUNCTION__);
746
747 type = buffer_get_int(m);
748 cuser = buffer_get_string(m, NULL);
749 chost = buffer_get_string(m, NULL);
750 blob = buffer_get_string(m, &bloblen);
751
752 key = key_from_blob(blob, bloblen);
753
754 if ((compat20 && type == MM_RSAHOSTKEY) ||
755 (!compat20 && type != MM_RSAHOSTKEY))
756 fatal("%s: key type and protocol mismatch", __FUNCTION__);
757
758 debug3("%s: key_from_blob: %p", __FUNCTION__, key);
759
760 if (key != NULL && authctxt->pw != NULL) {
761 switch(type) {
762 case MM_USERKEY:
763 allowed = user_key_allowed(authctxt->pw, key);
764 break;
765 case MM_HOSTKEY:
766 allowed = hostbased_key_allowed(authctxt->pw,
767 cuser, chost, key);
768 break;
769 case MM_RSAHOSTKEY:
770 key->type = KEY_RSA1; /* XXX */
771 allowed = auth_rhosts_rsa_key_allowed(authctxt->pw,
772 cuser, chost, key);
773 break;
774 default:
775 fatal("%s: unknown key type %d", __FUNCTION__, type);
776 break;
777 }
778 key_free(key);
779 }
780
781 /* clear temporarily storage (used by verify) */
782 monitor_reset_key_state();
783
784 if (allowed) {
785 /* Save temporarily for comparison in verify */
786 key_blob = blob;
787 key_bloblen = bloblen;
788 key_blobtype = type;
789 hostbased_cuser = cuser;
790 hostbased_chost = chost;
791 }
792
793 debug3("%s: key %p is %s",
794 __FUNCTION__, key, allowed ? "allowed" : "disallowed");
795
796 buffer_clear(m);
797 buffer_put_int(m, allowed);
798
799 mm_append_debug(m);
800
801 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
802
803 if (type == MM_RSAHOSTKEY)
804 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
805
806 return (0);
807}
808
809static int
810monitor_valid_userblob(u_char *data, u_int datalen)
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 if (datafellows & SSH_OLD_SESSIONID) {
822 buffer_consume(&b, session_id2_len);
823 } else {
824 xfree(buffer_get_string(&b, &len));
825 if (len != session_id2_len)
826 fail++;
827 }
828 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
829 fail++;
830 p = buffer_get_string(&b, NULL);
831 if (strcmp(authctxt->user, p) != 0) {
832 log("wrong user name passed to monitor: expected %s != %.100s",
833 authctxt->user, p);
834 fail++;
835 }
836 xfree(p);
837 buffer_skip_string(&b);
838 if (datafellows & SSH_BUG_PKAUTH) {
839 if (!buffer_get_char(&b))
840 fail++;
841 } else {
842 p = buffer_get_string(&b, NULL);
843 if (strcmp("publickey", p) != 0)
844 fail++;
845 xfree(p);
846 if (!buffer_get_char(&b))
847 fail++;
848 buffer_skip_string(&b);
849 }
850 buffer_skip_string(&b);
851 if (buffer_len(&b) != 0)
852 fail++;
853 buffer_free(&b);
854 return (fail == 0);
855}
856
857static int
858monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
859 u_char *chost)
860{
861 Buffer b;
862 u_char *p;
863 u_int len;
864 int fail = 0;
865 int session_id2_len = 20 /*XXX should get from [net] */;
866
867 buffer_init(&b);
868 buffer_append(&b, data, datalen);
869
870 xfree(buffer_get_string(&b, &len));
871 if (len != session_id2_len)
872 fail++;
873 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
874 fail++;
875 p = buffer_get_string(&b, NULL);
876 if (strcmp(authctxt->user, p) != 0) {
877 log("wrong user name passed to monitor: expected %s != %.100s",
878 authctxt->user, p);
879 fail++;
880 }
881 xfree(p);
882 buffer_skip_string(&b); /* service */
883 p = buffer_get_string(&b, NULL);
884 if (strcmp(p, "hostbased") != 0)
885 fail++;
886 xfree(p);
887 buffer_skip_string(&b); /* pkalg */
888 buffer_skip_string(&b); /* pkblob */
889
890 /* verify client host, strip trailing dot if necessary */
891 p = buffer_get_string(&b, NULL);
892 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
893 p[len - 1] = '\0';
894 if (strcmp(p, chost) != 0)
895 fail++;
896 xfree(p);
897
898 /* verify client user */
899 p = buffer_get_string(&b, NULL);
900 if (strcmp(p, cuser) != 0)
901 fail++;
902 xfree(p);
903
904 if (buffer_len(&b) != 0)
905 fail++;
906 buffer_free(&b);
907 return (fail == 0);
908}
909
910int
911mm_answer_keyverify(int socket, Buffer *m)
912{
913 Key *key;
914 u_char *signature, *data, *blob;
915 u_int signaturelen, datalen, bloblen;
916 int verified = 0;
917 int valid_data = 0;
918
919 blob = buffer_get_string(m, &bloblen);
920 signature = buffer_get_string(m, &signaturelen);
921 data = buffer_get_string(m, &datalen);
922
923 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
300e01c4 924 !monitor_allowed_key(blob, bloblen))
1853d1ef 925 fatal("%s: bad key, not previously allowed", __FUNCTION__);
926
927 key = key_from_blob(blob, bloblen);
928 if (key == NULL)
929 fatal("%s: bad public key blob", __FUNCTION__);
930
931 switch (key_blobtype) {
932 case MM_USERKEY:
933 valid_data = monitor_valid_userblob(data, datalen);
934 break;
935 case MM_HOSTKEY:
936 valid_data = monitor_valid_hostbasedblob(data, datalen,
937 hostbased_cuser, hostbased_chost);
938 break;
939 default:
940 valid_data = 0;
941 break;
942 }
943 if (!valid_data)
944 fatal("%s: bad signature data blob", __FUNCTION__);
945
946 verified = key_verify(key, signature, signaturelen, data, datalen);
947 debug3("%s: key %p signature %s",
948 __FUNCTION__, key, verified ? "verified" : "unverified");
949
950 key_free(key);
951 xfree(blob);
952 xfree(signature);
953 xfree(data);
954
955 monitor_reset_key_state();
956
957 buffer_clear(m);
958 buffer_put_int(m, verified);
959 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
960
961 auth_method = "publickey";
962
963 return (verified);
964}
965
966static void
967mm_record_login(Session *s, struct passwd *pw)
968{
969 socklen_t fromlen;
970 struct sockaddr_storage from;
971
972 /*
973 * Get IP address of client. If the connection is not a socket, let
974 * the address be 0.0.0.0.
975 */
976 memset(&from, 0, sizeof(from));
977 if (packet_connection_is_on_socket()) {
978 fromlen = sizeof(from);
979 if (getpeername(packet_get_connection_in(),
980 (struct sockaddr *) & from, &fromlen) < 0) {
981 debug("getpeername: %.100s", strerror(errno));
982 fatal_cleanup();
983 }
984 }
985 /* Record that there was a login on that tty from the remote host. */
986 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
987 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
988 (struct sockaddr *)&from);
989}
990
991static void
992mm_session_close(Session *s)
993{
994 debug3("%s: session %d pid %d", __FUNCTION__, s->self, s->pid);
995 if (s->ttyfd != -1) {
996 debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ptyfd);
997 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
998 session_pty_cleanup2(s);
999 }
1000 s->used = 0;
1001}
1002
1003int
1004mm_answer_pty(int socket, Buffer *m)
1005{
1006 extern struct monitor *monitor;
1007 Session *s;
1008 int res, fd0;
1009
1010 debug3("%s entering", __FUNCTION__);
1011
1012 buffer_clear(m);
1013 s = session_new();
1014 if (s == NULL)
1015 goto error;
1016 s->authctxt = authctxt;
1017 s->pw = authctxt->pw;
1018 s->pid = monitor->m_pid;
1019 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1020 if (res == 0)
1021 goto error;
1022 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1023 pty_setowner(authctxt->pw, s->tty);
1024
1025 buffer_put_int(m, 1);
1026 buffer_put_cstring(m, s->tty);
1027 mm_request_send(socket, MONITOR_ANS_PTY, m);
1028
1029 mm_send_fd(socket, s->ptyfd);
1030 mm_send_fd(socket, s->ttyfd);
1031
1032 /* We need to trick ttyslot */
1033 if (dup2(s->ttyfd, 0) == -1)
1034 fatal("%s: dup2", __FUNCTION__);
1035
1036 mm_record_login(s, authctxt->pw);
1037
1038 /* Now we can close the file descriptor again */
1039 close(0);
1040
1041 /* make sure nothing uses fd 0 */
1042 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1043 fatal("%s: open(/dev/null): %s", __FUNCTION__, strerror(errno));
1044 if (fd0 != 0)
1045 error("%s: fd0 %d != 0", __FUNCTION__, fd0);
1046
1047 /* slave is not needed */
1048 close(s->ttyfd);
1049 s->ttyfd = s->ptyfd;
1050 /* no need to dup() because nobody closes ptyfd */
1051 s->ptymaster = s->ptyfd;
1052
1053 debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ttyfd);
1054
1055 return (0);
1056
1057 error:
1058 if (s != NULL)
1059 mm_session_close(s);
1060 buffer_put_int(m, 0);
1061 mm_request_send(socket, MONITOR_ANS_PTY, m);
1062 return (0);
1063}
1064
1065int
1066mm_answer_pty_cleanup(int socket, Buffer *m)
1067{
1068 Session *s;
1069 char *tty;
1070
1071 debug3("%s entering", __FUNCTION__);
1072
1073 tty = buffer_get_string(m, NULL);
1074 if ((s = session_by_tty(tty)) != NULL)
1075 mm_session_close(s);
1076 buffer_clear(m);
1077 xfree(tty);
1078 return (0);
1079}
1080
1081int
1082mm_answer_sesskey(int socket, Buffer *m)
1083{
1084 BIGNUM *p;
1085 int rsafail;
1086
1087 /* Turn off permissions */
1088 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1089
1090 if ((p = BN_new()) == NULL)
1091 fatal("%s: BN_new", __FUNCTION__);
1092
1093 buffer_get_bignum2(m, p);
1094
1095 rsafail = ssh1_session_key(p);
1096
1097 buffer_clear(m);
1098 buffer_put_int(m, rsafail);
1099 buffer_put_bignum2(m, p);
1100
1101 BN_clear_free(p);
1102
1103 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1104
1105 /* Turn on permissions for sessid passing */
1106 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1107
1108 return (0);
1109}
1110
1111int
1112mm_answer_sessid(int socket, Buffer *m)
1113{
1114 int i;
1115
1116 debug3("%s entering", __FUNCTION__);
1117
1118 if (buffer_len(m) != 16)
1119 fatal("%s: bad ssh1 session id", __FUNCTION__);
1120 for (i = 0; i < 16; i++)
1121 session_id[i] = buffer_get_char(m);
1122
1123 /* Turn on permissions for getpwnam */
1124 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1125
1126 return (0);
1127}
1128
1129int
1130mm_answer_rsa_keyallowed(int socket, Buffer *m)
1131{
1132 BIGNUM *client_n;
1133 Key *key = NULL;
1134 u_char *blob = NULL;
1135 u_int blen = 0;
1136 int allowed = 0;
1137
1138 debug3("%s entering", __FUNCTION__);
1139
1140 if (authctxt->valid) {
1141 if ((client_n = BN_new()) == NULL)
1142 fatal("%s: BN_new", __FUNCTION__);
1143 buffer_get_bignum2(m, client_n);
1144 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1145 BN_clear_free(client_n);
1146 }
1147 buffer_clear(m);
1148 buffer_put_int(m, allowed);
1149
1150 /* clear temporarily storage (used by generate challenge) */
1151 monitor_reset_key_state();
1152
1153 if (allowed && key != NULL) {
1154 key->type = KEY_RSA; /* cheat for key_to_blob */
1155 if (key_to_blob(key, &blob, &blen) == 0)
1156 fatal("%s: key_to_blob failed", __FUNCTION__);
1157 buffer_put_string(m, blob, blen);
1158
1159 /* Save temporarily for comparison in verify */
1160 key_blob = blob;
1161 key_bloblen = blen;
1162 key_blobtype = MM_RSAUSERKEY;
1163 key_free(key);
1164 }
1165
1166 mm_append_debug(m);
1167
1168 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1169
1170 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1171 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1172 return (0);
1173}
1174
1175int
1176mm_answer_rsa_challenge(int socket, Buffer *m)
1177{
1178 Key *key = NULL;
1179 u_char *blob;
1180 u_int blen;
1181
1182 debug3("%s entering", __FUNCTION__);
1183
1184 if (!authctxt->valid)
1185 fatal("%s: authctxt not valid", __FUNCTION__);
1186 blob = buffer_get_string(m, &blen);
1187 if (!monitor_allowed_key(blob, blen))
1188 fatal("%s: bad key, not previously allowed", __FUNCTION__);
1189 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1190 fatal("%s: key type mismatch", __FUNCTION__);
1191 if ((key = key_from_blob(blob, blen)) == NULL)
1192 fatal("%s: received bad key", __FUNCTION__);
1193
1194 if (ssh1_challenge)
1195 BN_clear_free(ssh1_challenge);
1196 ssh1_challenge = auth_rsa_generate_challenge(key);
1197
1198 buffer_clear(m);
1199 buffer_put_bignum2(m, ssh1_challenge);
1200
1201 debug3("%s sending reply", __FUNCTION__);
1202 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1203
1204 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1205 return (0);
1206}
1207
1208int
1209mm_answer_rsa_response(int socket, Buffer *m)
1210{
1211 Key *key = NULL;
1212 u_char *blob, *response;
1213 u_int blen, len;
1214 int success;
1215
1216 debug3("%s entering", __FUNCTION__);
1217
1218 if (!authctxt->valid)
1219 fatal("%s: authctxt not valid", __FUNCTION__);
1220 if (ssh1_challenge == NULL)
1221 fatal("%s: no ssh1_challenge", __FUNCTION__);
1222
1223 blob = buffer_get_string(m, &blen);
1224 if (!monitor_allowed_key(blob, blen))
1225 fatal("%s: bad key, not previously allowed", __FUNCTION__);
1226 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1227 fatal("%s: key type mismatch: %d", __FUNCTION__, key_blobtype);
1228 if ((key = key_from_blob(blob, blen)) == NULL)
1229 fatal("%s: received bad key", __FUNCTION__);
1230 response = buffer_get_string(m, &len);
1231 if (len != 16)
1232 fatal("%s: received bad response to challenge", __FUNCTION__);
1233 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1234
1235 key_free(key);
1236 xfree(response);
1237
1238 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1239
1240 /* reset state */
1241 BN_clear_free(ssh1_challenge);
1242 ssh1_challenge = NULL;
1243 monitor_reset_key_state();
1244
1245 buffer_clear(m);
1246 buffer_put_int(m, success);
1247 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1248
1249 return (success);
1250}
1251
1252int
1253mm_answer_term(int socket, Buffer *req)
1254{
1255 extern struct monitor *monitor;
1256 int res, status;
1257
1258 debug3("%s: tearing down sessions", __FUNCTION__);
1259
1260 /* The child is terminating */
1261 session_destroy_all(&mm_session_close);
1262
8c38e88b 1263 while (waitpid(monitor->m_pid, &status, 0) == -1)
1264 if (errno != EINTR)
1265 exit(1);
1853d1ef 1266
1267 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1268
1269 /* Terminate process */
1270 exit (res);
1271}
1272
1273void
1274monitor_apply_keystate(struct monitor *monitor)
1275{
1276 if (compat20) {
1277 set_newkeys(MODE_IN);
1278 set_newkeys(MODE_OUT);
1279 } else {
1280 u_char key[SSH_SESSION_KEY_LENGTH];
1281
1282 memset(key, 'a', sizeof(key));
1283 packet_set_protocol_flags(child_state.ssh1protoflags);
1284 packet_set_encryption_key(key, SSH_SESSION_KEY_LENGTH,
1285 child_state.ssh1cipher);
1286 }
1287
1288 packet_set_keycontext(MODE_OUT, child_state.keyout);
1289 xfree(child_state.keyout);
1290 packet_set_keycontext(MODE_IN, child_state.keyin);
1291 xfree(child_state.keyin);
1292
1293 if (!compat20) {
1294 packet_set_iv(MODE_OUT, child_state.ivout);
1295 xfree(child_state.ivout);
1296 packet_set_iv(MODE_IN, child_state.ivin);
1297 xfree(child_state.ivin);
1298 }
1299
1300 memcpy(&incoming_stream, &child_state.incoming,
1301 sizeof(incoming_stream));
1302 memcpy(&outgoing_stream, &child_state.outgoing,
1303 sizeof(outgoing_stream));
1304
1305 /* Update with new address */
1306 mm_init_compression(monitor->m_zlib);
1307
1308 /* Network I/O buffers */
1309 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1310 buffer_clear(&input);
1311 buffer_append(&input, child_state.input, child_state.ilen);
1312 memset(child_state.input, 0, child_state.ilen);
1313 xfree(child_state.input);
1314
1315 buffer_clear(&output);
1316 buffer_append(&output, child_state.output, child_state.olen);
1317 memset(child_state.output, 0, child_state.olen);
1318 xfree(child_state.output);
1319}
1320
1321static Kex *
1322mm_get_kex(Buffer *m)
1323{
1324 Kex *kex;
1325 void *blob;
1326 u_int bloblen;
1327
1328 kex = xmalloc(sizeof(*kex));
1329 memset(kex, 0, sizeof(*kex));
1330 kex->session_id = buffer_get_string(m, &kex->session_id_len);
1331 kex->we_need = buffer_get_int(m);
1332 kex->server = 1;
1333 kex->hostkey_type = buffer_get_int(m);
1334 kex->kex_type = buffer_get_int(m);
1335 blob = buffer_get_string(m, &bloblen);
1336 buffer_init(&kex->my);
1337 buffer_append(&kex->my, blob, bloblen);
1338 xfree(blob);
1339 blob = buffer_get_string(m, &bloblen);
1340 buffer_init(&kex->peer);
1341 buffer_append(&kex->peer, blob, bloblen);
1342 xfree(blob);
1343 kex->done = 1;
1344 kex->flags = buffer_get_int(m);
1345 kex->client_version_string = buffer_get_string(m, NULL);
1346 kex->server_version_string = buffer_get_string(m, NULL);
1347 kex->load_host_key=&get_hostkey_by_type;
1348 kex->host_key_index=&get_hostkey_index;
1349
1350 return (kex);
1351}
1352
1353/* This function requries careful sanity checking */
1354
1355void
1356mm_get_keystate(struct monitor *monitor)
1357{
1358 Buffer m;
1359 u_char *blob, *p;
1360 u_int bloblen, plen;
1361
1362 debug3("%s: Waiting for new keys", __FUNCTION__);
1363
1364 buffer_init(&m);
1365 mm_request_receive_expect(monitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1366 if (!compat20) {
1367 child_state.ssh1protoflags = buffer_get_int(&m);
1368 child_state.ssh1cipher = buffer_get_int(&m);
1369 child_state.ivout = buffer_get_string(&m,
1370 &child_state.ivoutlen);
1371 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1372 goto skip;
1373 } else {
1374 /* Get the Kex for rekeying */
1375 *monitor->m_pkex = mm_get_kex(&m);
1376 }
1377
1378 blob = buffer_get_string(&m, &bloblen);
1379 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1380 xfree(blob);
1381
1382 debug3("%s: Waiting for second key", __FUNCTION__);
1383 blob = buffer_get_string(&m, &bloblen);
1384 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1385 xfree(blob);
1386
1387 /* Now get sequence numbers for the packets */
1388 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1389 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1390
1391 skip:
1392 /* Get the key context */
1393 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1394 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1395
1396 debug3("%s: Getting compression state", __FUNCTION__);
1397 /* Get compression state */
1398 p = buffer_get_string(&m, &plen);
1399 if (plen != sizeof(child_state.outgoing))
1400 fatal("%s: bad request size", __FUNCTION__);
1401 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1402 xfree(p);
1403
1404 p = buffer_get_string(&m, &plen);
1405 if (plen != sizeof(child_state.incoming))
1406 fatal("%s: bad request size", __FUNCTION__);
1407 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1408 xfree(p);
1409
1410 /* Network I/O buffers */
1411 debug3("%s: Getting Network I/O buffers", __FUNCTION__);
1412 child_state.input = buffer_get_string(&m, &child_state.ilen);
1413 child_state.output = buffer_get_string(&m, &child_state.olen);
1414
1415 buffer_free(&m);
1416}
1417
1418
1419/* Allocation functions for zlib */
1420void *
1421mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1422{
1423 void *address;
1424
1425 address = mm_malloc(mm, size * ncount);
1426
1427 return (address);
1428}
1429
1430void
1431mm_zfree(struct mm_master *mm, void *address)
1432{
1433 mm_free(mm, address);
1434}
1435
1436void
1437mm_init_compression(struct mm_master *mm)
1438{
1439 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1440 outgoing_stream.zfree = (free_func)mm_zfree;
1441 outgoing_stream.opaque = mm;
1442
1443 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1444 incoming_stream.zfree = (free_func)mm_zfree;
1445 incoming_stream.opaque = mm;
1446}
1447
1448/* XXX */
1449
1450#define FD_CLOSEONEXEC(x) do { \
1451 if (fcntl(x, F_SETFD, 1) == -1) \
1452 fatal("fcntl(%d, F_SETFD)", x); \
1453} while (0)
1454
1455static void
1456monitor_socketpair(int *pair)
1457{
f1af2dbf 1458#ifdef HAVE_SOCKETPAIR
1853d1ef 1459 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1460 fatal("%s: socketpair", __FUNCTION__);
f1af2dbf 1461#else
1462 fatal("%s: UsePrivilegeSeparation=yes not supported",
1463 __FUNCTION__);
1464#endif
1853d1ef 1465 FD_CLOSEONEXEC(pair[0]);
1466 FD_CLOSEONEXEC(pair[1]);
1467}
1468
1469#define MM_MEMSIZE 65536
1470
1471struct monitor *
1472monitor_init(void)
1473{
1474 struct monitor *mon;
1475 int pair[2];
1476
1477 mon = xmalloc(sizeof(*mon));
1478
1479 monitor_socketpair(pair);
1480
1481 mon->m_recvfd = pair[0];
1482 mon->m_sendfd = pair[1];
1483
1484 /* Used to share zlib space across processes */
1485 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1486 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1487
1488 /* Compression needs to share state across borders */
1489 mm_init_compression(mon->m_zlib);
1490
1491 return mon;
1492}
1493
1494void
1495monitor_reinit(struct monitor *mon)
1496{
1497 int pair[2];
1498
1499 monitor_socketpair(pair);
1500
1501 mon->m_recvfd = pair[0];
1502 mon->m_sendfd = pair[1];
1503}
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