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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"
0496cf34 28RCSID("$OpenBSD: monitor.c,v 1.16 2002/06/21 05:50:51 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;
9459414c 86 u_char *ssh1key;
87 u_int ssh1keylen;
1853d1ef 88 int ssh1cipher;
89 int ssh1protoflags;
90 u_char *input;
91 u_int ilen;
92 u_char *output;
93 u_int olen;
94} child_state;
95
96/* Functions on the montior that answer unprivileged requests */
97
98int mm_answer_moduli(int, Buffer *);
99int mm_answer_sign(int, Buffer *);
100int mm_answer_pwnamallow(int, Buffer *);
94a73cdc 101int mm_answer_auth2_read_banner(int, Buffer *);
1853d1ef 102int mm_answer_authserv(int, Buffer *);
103int mm_answer_authpassword(int, Buffer *);
104int mm_answer_bsdauthquery(int, Buffer *);
105int mm_answer_bsdauthrespond(int, Buffer *);
106int mm_answer_skeyquery(int, Buffer *);
107int mm_answer_skeyrespond(int, Buffer *);
108int mm_answer_keyallowed(int, Buffer *);
109int mm_answer_keyverify(int, Buffer *);
110int mm_answer_pty(int, Buffer *);
111int mm_answer_pty_cleanup(int, Buffer *);
112int mm_answer_term(int, Buffer *);
113int mm_answer_rsa_keyallowed(int, Buffer *);
114int mm_answer_rsa_challenge(int, Buffer *);
115int mm_answer_rsa_response(int, Buffer *);
116int mm_answer_sesskey(int, Buffer *);
117int mm_answer_sessid(int, Buffer *);
118
ad200abb 119#ifdef USE_PAM
120int mm_answer_pam_start(int, Buffer *);
121#endif
122
1853d1ef 123static Authctxt *authctxt;
124static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
125
126/* local state for key verify */
127static u_char *key_blob = NULL;
128static u_int key_bloblen = 0;
129static int key_blobtype = MM_NOKEY;
130static u_char *hostbased_cuser = NULL;
131static u_char *hostbased_chost = NULL;
132static char *auth_method = "unknown";
521d606b 133static int session_id2_len = 0;
134static u_char *session_id2 = NULL;
1853d1ef 135
136struct mon_table {
137 enum monitor_reqtype type;
138 int flags;
139 int (*f)(int, Buffer *);
140};
141
142#define MON_ISAUTH 0x0004 /* Required for Authentication */
143#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
144#define MON_ONCE 0x0010 /* Disable after calling */
145
146#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
147
148#define MON_PERMIT 0x1000 /* Request is permitted */
149
150struct mon_table mon_dispatch_proto20[] = {
151 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
152 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
153 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
154 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
94a73cdc 155 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1853d1ef 156 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
ad200abb 157#ifdef USE_PAM
158 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
8b314ec9 159#endif
1853d1ef 160#ifdef BSD_AUTH
161 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
162 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
163#endif
164#ifdef SKEY
165 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
166 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
167#endif
168 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
169 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
170 {0, 0, NULL}
171};
172
173struct mon_table mon_dispatch_postauth20[] = {
174 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
175 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
176 {MONITOR_REQ_PTY, 0, mm_answer_pty},
177 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
178 {MONITOR_REQ_TERM, 0, mm_answer_term},
179 {0, 0, NULL}
180};
181
182struct mon_table mon_dispatch_proto15[] = {
183 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
184 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
185 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
186 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
187 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
188 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
189 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
190 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
efe44db6 191#ifdef USE_PAM
192 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
193#endif
1853d1ef 194#ifdef BSD_AUTH
195 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
196 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
197#endif
198#ifdef SKEY
199 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
200 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
efe44db6 201#endif
202#ifdef USE_PAM
203 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
1853d1ef 204#endif
205 {0, 0, NULL}
206};
207
208struct mon_table mon_dispatch_postauth15[] = {
209 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
210 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
211 {MONITOR_REQ_TERM, 0, mm_answer_term},
212 {0, 0, NULL}
213};
214
215struct mon_table *mon_dispatch;
216
217/* Specifies if a certain message is allowed at the moment */
218
219static void
220monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
221{
222 while (ent->f != NULL) {
223 if (ent->type == type) {
224 ent->flags &= ~MON_PERMIT;
225 ent->flags |= permit ? MON_PERMIT : 0;
226 return;
227 }
228 ent++;
229 }
230}
231
232static void
233monitor_permit_authentications(int permit)
234{
235 struct mon_table *ent = mon_dispatch;
236
237 while (ent->f != NULL) {
238 if (ent->flags & MON_AUTH) {
239 ent->flags &= ~MON_PERMIT;
240 ent->flags |= permit ? MON_PERMIT : 0;
241 }
242 ent++;
243 }
244}
245
246Authctxt *
b5a28cbc 247monitor_child_preauth(struct monitor *pmonitor)
1853d1ef 248{
249 struct mon_table *ent;
250 int authenticated = 0;
251
252 debug3("preauth child monitor started");
253
254 if (compat20) {
255 mon_dispatch = mon_dispatch_proto20;
256
257 /* Permit requests for moduli and signatures */
258 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
259 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
260 } else {
261 mon_dispatch = mon_dispatch_proto15;
262
263 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
264 }
265
266 authctxt = authctxt_new();
267
268 /* The first few requests do not require asynchronous access */
269 while (!authenticated) {
b5a28cbc 270 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
1853d1ef 271 if (authenticated) {
272 if (!(ent->flags & MON_AUTHDECIDE))
273 fatal("%s: unexpected authentication from %d",
1588c277 274 __func__, ent->type);
1853d1ef 275 if (authctxt->pw->pw_uid == 0 &&
276 !auth_root_allowed(auth_method))
277 authenticated = 0;
ad200abb 278#ifdef USE_PAM
279 if (!do_pam_account(authctxt->pw->pw_name, NULL))
280 authenticated = 0;
281#endif
1853d1ef 282 }
283
284 if (ent->flags & MON_AUTHDECIDE) {
285 auth_log(authctxt, authenticated, auth_method,
286 compat20 ? " ssh2" : "");
287 if (!authenticated)
288 authctxt->failures++;
289 }
290 }
291
292 if (!authctxt->valid)
1588c277 293 fatal("%s: authenticated invalid user", __func__);
1853d1ef 294
295 debug("%s: %s has been authenticated by privileged process",
1588c277 296 __func__, authctxt->user);
1853d1ef 297
b5a28cbc 298 mm_get_keystate(pmonitor);
1853d1ef 299
300 return (authctxt);
301}
302
303void
b5a28cbc 304monitor_child_postauth(struct monitor *pmonitor)
1853d1ef 305{
306 if (compat20) {
307 mon_dispatch = mon_dispatch_postauth20;
308
309 /* Permit requests for moduli and signatures */
310 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
311 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
312 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
313
314 } else {
315 mon_dispatch = mon_dispatch_postauth15;
316 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
317 }
318 if (!no_pty_flag) {
319 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
320 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
321 }
322
323 for (;;)
b5a28cbc 324 monitor_read(pmonitor, mon_dispatch, NULL);
1853d1ef 325}
326
327void
b5a28cbc 328monitor_sync(struct monitor *pmonitor)
1853d1ef 329{
0496cf34 330 if (options.compression) {
331 /* The member allocation is not visible, so sync it */
332 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
333 }
1853d1ef 334}
335
336int
b5a28cbc 337monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1853d1ef 338 struct mon_table **pent)
339{
340 Buffer m;
341 int ret;
342 u_char type;
343
344 buffer_init(&m);
345
b5a28cbc 346 mm_request_receive(pmonitor->m_sendfd, &m);
1853d1ef 347 type = buffer_get_char(&m);
348
1588c277 349 debug3("%s: checking request %d", __func__, type);
1853d1ef 350
351 while (ent->f != NULL) {
352 if (ent->type == type)
353 break;
354 ent++;
355 }
356
357 if (ent->f != NULL) {
358 if (!(ent->flags & MON_PERMIT))
1588c277 359 fatal("%s: unpermitted request %d", __func__,
1853d1ef 360 type);
b5a28cbc 361 ret = (*ent->f)(pmonitor->m_sendfd, &m);
1853d1ef 362 buffer_free(&m);
363
364 /* The child may use this request only once, disable it */
365 if (ent->flags & MON_ONCE) {
1588c277 366 debug2("%s: %d used once, disabling now", __func__,
1853d1ef 367 type);
368 ent->flags &= ~MON_PERMIT;
369 }
370
371 if (pent != NULL)
372 *pent = ent;
373
374 return ret;
375 }
376
1588c277 377 fatal("%s: unsupported request: %d", __func__, type);
1853d1ef 378
379 /* NOTREACHED */
380 return (-1);
381}
382
383/* allowed key state */
384static int
385monitor_allowed_key(u_char *blob, u_int bloblen)
386{
387 /* make sure key is allowed */
388 if (key_blob == NULL || key_bloblen != bloblen ||
389 memcmp(key_blob, blob, key_bloblen))
390 return (0);
391 return (1);
392}
393
394static void
395monitor_reset_key_state(void)
396{
397 /* reset state */
398 if (key_blob != NULL)
399 xfree(key_blob);
400 if (hostbased_cuser != NULL)
401 xfree(hostbased_cuser);
402 if (hostbased_chost != NULL)
403 xfree(hostbased_chost);
404 key_blob = NULL;
405 key_bloblen = 0;
406 key_blobtype = MM_NOKEY;
407 hostbased_cuser = NULL;
408 hostbased_chost = NULL;
409}
410
411int
412mm_answer_moduli(int socket, Buffer *m)
413{
414 DH *dh;
415 int min, want, max;
416
417 min = buffer_get_int(m);
418 want = buffer_get_int(m);
419 max = buffer_get_int(m);
420
421 debug3("%s: got parameters: %d %d %d",
1588c277 422 __func__, min, want, max);
1853d1ef 423 /* We need to check here, too, in case the child got corrupted */
424 if (max < min || want < min || max < want)
425 fatal("%s: bad parameters: %d %d %d",
1588c277 426 __func__, min, want, max);
1853d1ef 427
428 buffer_clear(m);
429
430 dh = choose_dh(min, want, max);
431 if (dh == NULL) {
432 buffer_put_char(m, 0);
433 return (0);
434 } else {
435 /* Send first bignum */
436 buffer_put_char(m, 1);
437 buffer_put_bignum2(m, dh->p);
438 buffer_put_bignum2(m, dh->g);
439
440 DH_free(dh);
441 }
442 mm_request_send(socket, MONITOR_ANS_MODULI, m);
443 return (0);
444}
445
446int
447mm_answer_sign(int socket, Buffer *m)
448{
449 Key *key;
450 u_char *p;
451 u_char *signature;
452 u_int siglen, datlen;
453 int keyid;
454
1588c277 455 debug3("%s", __func__);
1853d1ef 456
457 keyid = buffer_get_int(m);
458 p = buffer_get_string(m, &datlen);
459
460 if (datlen != 20)
1588c277 461 fatal("%s: data length incorrect: %d", __func__, datlen);
1853d1ef 462
521d606b 463 /* save session id, it will be passed on the first call */
464 if (session_id2_len == 0) {
465 session_id2_len = datlen;
466 session_id2 = xmalloc(session_id2_len);
467 memcpy(session_id2, p, session_id2_len);
468 }
469
1853d1ef 470 if ((key = get_hostkey_by_index(keyid)) == NULL)
1588c277 471 fatal("%s: no hostkey from index %d", __func__, keyid);
1853d1ef 472 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
1588c277 473 fatal("%s: key_sign failed", __func__);
1853d1ef 474
1588c277 475 debug3("%s: signature %p(%d)", __func__, signature, siglen);
1853d1ef 476
477 buffer_clear(m);
478 buffer_put_string(m, signature, siglen);
479
480 xfree(p);
481 xfree(signature);
482
483 mm_request_send(socket, MONITOR_ANS_SIGN, m);
484
485 /* Turn on permissions for getpwnam */
486 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
487
488 return (0);
489}
490
491/* Retrieves the password entry and also checks if the user is permitted */
492
493int
494mm_answer_pwnamallow(int socket, Buffer *m)
495{
496 char *login;
497 struct passwd *pwent;
498 int allowed = 0;
499
1588c277 500 debug3("%s", __func__);
1853d1ef 501
502 if (authctxt->attempt++ != 0)
1588c277 503 fatal("%s: multiple attempts for getpwnam", __func__);
1853d1ef 504
505 login = buffer_get_string(m, NULL);
506
507 pwent = getpwnamallow(login);
508
509 authctxt->user = xstrdup(login);
510 setproctitle("%s [priv]", pwent ? login : "unknown");
511 xfree(login);
512
513 buffer_clear(m);
514
515 if (pwent == NULL) {
516 buffer_put_char(m, 0);
517 goto out;
518 }
519
520 allowed = 1;
521 authctxt->pw = pwent;
522 authctxt->valid = 1;
523
524 buffer_put_char(m, 1);
525 buffer_put_string(m, pwent, sizeof(struct passwd));
526 buffer_put_cstring(m, pwent->pw_name);
527 buffer_put_cstring(m, "*");
528 buffer_put_cstring(m, pwent->pw_gecos);
7b18c353 529#ifdef HAVE_PW_CLASS_IN_PASSWD
1853d1ef 530 buffer_put_cstring(m, pwent->pw_class);
7b18c353 531#endif
1853d1ef 532 buffer_put_cstring(m, pwent->pw_dir);
533 buffer_put_cstring(m, pwent->pw_shell);
534
535 out:
1588c277 536 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1853d1ef 537 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
538
539 /* For SSHv1 allow authentication now */
540 if (!compat20)
541 monitor_permit_authentications(1);
94a73cdc 542 else {
1853d1ef 543 /* Allow service/style information on the auth context */
544 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
94a73cdc 545 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
546 }
1853d1ef 547
efe44db6 548#ifdef USE_PAM
549 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
550#endif
1853d1ef 551
552 return (0);
553}
554
94a73cdc 555int mm_answer_auth2_read_banner(int socket, Buffer *m)
556{
557 char *banner;
558
559 buffer_clear(m);
560 banner = auth2_read_banner();
561 buffer_put_cstring(m, banner != NULL ? banner : "");
562 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
563
564 if (banner != NULL)
565 free(banner);
566
567 return (0);
568}
569
1853d1ef 570int
571mm_answer_authserv(int socket, Buffer *m)
572{
573 monitor_permit_authentications(1);
574
575 authctxt->service = buffer_get_string(m, NULL);
576 authctxt->style = buffer_get_string(m, NULL);
577 debug3("%s: service=%s, style=%s",
1588c277 578 __func__, authctxt->service, authctxt->style);
1853d1ef 579
580 if (strlen(authctxt->style) == 0) {
581 xfree(authctxt->style);
582 authctxt->style = NULL;
583 }
584
585 return (0);
586}
587
588int
589mm_answer_authpassword(int socket, Buffer *m)
590{
591 static int call_count;
592 char *passwd;
593 int authenticated, plen;
594
595 passwd = buffer_get_string(m, &plen);
596 /* Only authenticate if the context is valid */
aa586f8e 597 authenticated = options.password_authentication &&
598 authctxt->valid && auth_password(authctxt, passwd);
1853d1ef 599 memset(passwd, 0, strlen(passwd));
600 xfree(passwd);
601
602 buffer_clear(m);
603 buffer_put_int(m, authenticated);
604
1588c277 605 debug3("%s: sending result %d", __func__, authenticated);
1853d1ef 606 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
607
608 call_count++;
609 if (plen == 0 && call_count == 1)
610 auth_method = "none";
611 else
612 auth_method = "password";
613
614 /* Causes monitor loop to terminate if authenticated */
615 return (authenticated);
616}
617
618#ifdef BSD_AUTH
619int
620mm_answer_bsdauthquery(int socket, Buffer *m)
621{
622 char *name, *infotxt;
623 u_int numprompts;
624 u_int *echo_on;
625 char **prompts;
626 int res;
627
628 res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
629 &prompts, &echo_on);
630
631 buffer_clear(m);
632 buffer_put_int(m, res);
633 if (res != -1)
634 buffer_put_cstring(m, prompts[0]);
635
1588c277 636 debug3("%s: sending challenge res: %d", __func__, res);
1853d1ef 637 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
638
639 if (res != -1) {
640 xfree(name);
641 xfree(infotxt);
642 xfree(prompts);
643 xfree(echo_on);
644 }
645
646 return (0);
647}
648
649int
650mm_answer_bsdauthrespond(int socket, Buffer *m)
651{
652 char *response;
653 int authok;
654
655 if (authctxt->as == 0)
1588c277 656 fatal("%s: no bsd auth session", __func__);
1853d1ef 657
658 response = buffer_get_string(m, NULL);
aa586f8e 659 authok = options.challenge_response_authentication &&
660 auth_userresponse(authctxt->as, response, 0);
1853d1ef 661 authctxt->as = NULL;
1588c277 662 debug3("%s: <%s> = <%d>", __func__, response, authok);
1853d1ef 663 xfree(response);
664
665 buffer_clear(m);
666 buffer_put_int(m, authok);
667
1588c277 668 debug3("%s: sending authenticated: %d", __func__, authok);
1853d1ef 669 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
670
671 auth_method = "bsdauth";
672
673 return (authok != 0);
674}
675#endif
676
677#ifdef SKEY
678int
679mm_answer_skeyquery(int socket, Buffer *m)
680{
681 struct skey skey;
682 char challenge[1024];
683 int res;
684
685 res = skeychallenge(&skey, authctxt->user, challenge);
686
687 buffer_clear(m);
688 buffer_put_int(m, res);
689 if (res != -1)
690 buffer_put_cstring(m, challenge);
691
1588c277 692 debug3("%s: sending challenge res: %d", __func__, res);
1853d1ef 693 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
694
695 return (0);
696}
697
698int
699mm_answer_skeyrespond(int socket, Buffer *m)
700{
701 char *response;
702 int authok;
703
704 response = buffer_get_string(m, NULL);
705
aa586f8e 706 authok = (options.challenge_response_authentication &&
707 authctxt->valid &&
1853d1ef 708 skey_haskey(authctxt->pw->pw_name) == 0 &&
709 skey_passcheck(authctxt->pw->pw_name, response) != -1);
710
711 xfree(response);
712
713 buffer_clear(m);
714 buffer_put_int(m, authok);
715
1588c277 716 debug3("%s: sending authenticated: %d", __func__, authok);
1853d1ef 717 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
718
719 auth_method = "skey";
720
721 return (authok != 0);
722}
723#endif
724
ad200abb 725#ifdef USE_PAM
726int
727mm_answer_pam_start(int socket, Buffer *m)
728{
729 char *user;
730
731 user = buffer_get_string(m, NULL);
732
733 start_pam(user);
734
735 xfree(user);
736
737 return (0);
738}
739#endif
740
1853d1ef 741static void
742mm_append_debug(Buffer *m)
743{
744 if (auth_debug_init && buffer_len(&auth_debug)) {
1588c277 745 debug3("%s: Appending debug messages for child", __func__);
1853d1ef 746 buffer_append(m, buffer_ptr(&auth_debug),
747 buffer_len(&auth_debug));
748 buffer_clear(&auth_debug);
749 }
750}
751
752int
753mm_answer_keyallowed(int socket, Buffer *m)
754{
755 Key *key;
756 u_char *cuser, *chost, *blob;
757 u_int bloblen;
758 enum mm_keytype type = 0;
759 int allowed = 0;
760
1588c277 761 debug3("%s entering", __func__);
1853d1ef 762
763 type = buffer_get_int(m);
764 cuser = buffer_get_string(m, NULL);
765 chost = buffer_get_string(m, NULL);
766 blob = buffer_get_string(m, &bloblen);
767
768 key = key_from_blob(blob, bloblen);
769
770 if ((compat20 && type == MM_RSAHOSTKEY) ||
771 (!compat20 && type != MM_RSAHOSTKEY))
1588c277 772 fatal("%s: key type and protocol mismatch", __func__);
1853d1ef 773
1588c277 774 debug3("%s: key_from_blob: %p", __func__, key);
1853d1ef 775
776 if (key != NULL && authctxt->pw != NULL) {
777 switch(type) {
778 case MM_USERKEY:
aa586f8e 779 allowed = options.pubkey_authentication &&
780 user_key_allowed(authctxt->pw, key);
1853d1ef 781 break;
782 case MM_HOSTKEY:
aa586f8e 783 allowed = options.hostbased_authentication &&
784 hostbased_key_allowed(authctxt->pw,
1853d1ef 785 cuser, chost, key);
786 break;
787 case MM_RSAHOSTKEY:
788 key->type = KEY_RSA1; /* XXX */
aa586f8e 789 allowed = options.rhosts_rsa_authentication &&
790 auth_rhosts_rsa_key_allowed(authctxt->pw,
1853d1ef 791 cuser, chost, key);
792 break;
793 default:
1588c277 794 fatal("%s: unknown key type %d", __func__, type);
1853d1ef 795 break;
796 }
797 key_free(key);
798 }
799
800 /* clear temporarily storage (used by verify) */
801 monitor_reset_key_state();
802
803 if (allowed) {
804 /* Save temporarily for comparison in verify */
805 key_blob = blob;
806 key_bloblen = bloblen;
807 key_blobtype = type;
808 hostbased_cuser = cuser;
809 hostbased_chost = chost;
810 }
811
812 debug3("%s: key %p is %s",
1588c277 813 __func__, key, allowed ? "allowed" : "disallowed");
1853d1ef 814
815 buffer_clear(m);
816 buffer_put_int(m, allowed);
817
818 mm_append_debug(m);
819
820 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
821
822 if (type == MM_RSAHOSTKEY)
823 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
824
825 return (0);
826}
827
828static int
829monitor_valid_userblob(u_char *data, u_int datalen)
830{
831 Buffer b;
832 u_char *p;
833 u_int len;
834 int fail = 0;
1853d1ef 835
836 buffer_init(&b);
837 buffer_append(&b, data, datalen);
838
839 if (datafellows & SSH_OLD_SESSIONID) {
521d606b 840 p = buffer_ptr(&b);
841 len = buffer_len(&b);
842 if ((session_id2 == NULL) ||
843 (len < session_id2_len) ||
844 (memcmp(p, session_id2, session_id2_len) != 0))
845 fail++;
1853d1ef 846 buffer_consume(&b, session_id2_len);
847 } else {
521d606b 848 p = buffer_get_string(&b, &len);
849 if ((session_id2 == NULL) ||
850 (len != session_id2_len) ||
851 (memcmp(p, session_id2, session_id2_len) != 0))
1853d1ef 852 fail++;
521d606b 853 xfree(p);
1853d1ef 854 }
855 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
856 fail++;
857 p = buffer_get_string(&b, NULL);
858 if (strcmp(authctxt->user, p) != 0) {
859 log("wrong user name passed to monitor: expected %s != %.100s",
860 authctxt->user, p);
861 fail++;
862 }
863 xfree(p);
864 buffer_skip_string(&b);
865 if (datafellows & SSH_BUG_PKAUTH) {
866 if (!buffer_get_char(&b))
867 fail++;
868 } else {
869 p = buffer_get_string(&b, NULL);
870 if (strcmp("publickey", p) != 0)
871 fail++;
872 xfree(p);
873 if (!buffer_get_char(&b))
874 fail++;
875 buffer_skip_string(&b);
876 }
877 buffer_skip_string(&b);
878 if (buffer_len(&b) != 0)
879 fail++;
880 buffer_free(&b);
881 return (fail == 0);
882}
883
884static int
885monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
886 u_char *chost)
887{
888 Buffer b;
889 u_char *p;
890 u_int len;
891 int fail = 0;
1853d1ef 892
893 buffer_init(&b);
894 buffer_append(&b, data, datalen);
895
521d606b 896 p = buffer_get_string(&b, &len);
897 if ((session_id2 == NULL) ||
898 (len != session_id2_len) ||
899 (memcmp(p, session_id2, session_id2_len) != 0))
1853d1ef 900 fail++;
521d606b 901 xfree(p);
902
1853d1ef 903 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
904 fail++;
905 p = buffer_get_string(&b, NULL);
906 if (strcmp(authctxt->user, p) != 0) {
907 log("wrong user name passed to monitor: expected %s != %.100s",
908 authctxt->user, p);
909 fail++;
910 }
911 xfree(p);
912 buffer_skip_string(&b); /* service */
913 p = buffer_get_string(&b, NULL);
914 if (strcmp(p, "hostbased") != 0)
915 fail++;
916 xfree(p);
917 buffer_skip_string(&b); /* pkalg */
918 buffer_skip_string(&b); /* pkblob */
919
920 /* verify client host, strip trailing dot if necessary */
921 p = buffer_get_string(&b, NULL);
922 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
923 p[len - 1] = '\0';
924 if (strcmp(p, chost) != 0)
925 fail++;
926 xfree(p);
927
928 /* verify client user */
929 p = buffer_get_string(&b, NULL);
930 if (strcmp(p, cuser) != 0)
931 fail++;
932 xfree(p);
933
934 if (buffer_len(&b) != 0)
935 fail++;
936 buffer_free(&b);
937 return (fail == 0);
938}
939
940int
941mm_answer_keyverify(int socket, Buffer *m)
942{
943 Key *key;
944 u_char *signature, *data, *blob;
945 u_int signaturelen, datalen, bloblen;
946 int verified = 0;
947 int valid_data = 0;
948
949 blob = buffer_get_string(m, &bloblen);
950 signature = buffer_get_string(m, &signaturelen);
951 data = buffer_get_string(m, &datalen);
952
953 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
300e01c4 954 !monitor_allowed_key(blob, bloblen))
1588c277 955 fatal("%s: bad key, not previously allowed", __func__);
1853d1ef 956
957 key = key_from_blob(blob, bloblen);
958 if (key == NULL)
1588c277 959 fatal("%s: bad public key blob", __func__);
1853d1ef 960
961 switch (key_blobtype) {
962 case MM_USERKEY:
963 valid_data = monitor_valid_userblob(data, datalen);
964 break;
965 case MM_HOSTKEY:
966 valid_data = monitor_valid_hostbasedblob(data, datalen,
967 hostbased_cuser, hostbased_chost);
968 break;
969 default:
970 valid_data = 0;
971 break;
972 }
973 if (!valid_data)
1588c277 974 fatal("%s: bad signature data blob", __func__);
1853d1ef 975
976 verified = key_verify(key, signature, signaturelen, data, datalen);
977 debug3("%s: key %p signature %s",
1588c277 978 __func__, key, verified ? "verified" : "unverified");
1853d1ef 979
980 key_free(key);
981 xfree(blob);
982 xfree(signature);
983 xfree(data);
984
985 monitor_reset_key_state();
986
987 buffer_clear(m);
988 buffer_put_int(m, verified);
989 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
990
aa586f8e 991 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1853d1ef 992
993 return (verified);
994}
995
996static void
997mm_record_login(Session *s, struct passwd *pw)
998{
999 socklen_t fromlen;
1000 struct sockaddr_storage from;
1001
1002 /*
1003 * Get IP address of client. If the connection is not a socket, let
1004 * the address be 0.0.0.0.
1005 */
1006 memset(&from, 0, sizeof(from));
1007 if (packet_connection_is_on_socket()) {
1008 fromlen = sizeof(from);
1009 if (getpeername(packet_get_connection_in(),
1010 (struct sockaddr *) & from, &fromlen) < 0) {
1011 debug("getpeername: %.100s", strerror(errno));
1012 fatal_cleanup();
1013 }
1014 }
1015 /* Record that there was a login on that tty from the remote host. */
1016 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1017 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
1018 (struct sockaddr *)&from);
1019}
1020
1021static void
1022mm_session_close(Session *s)
1023{
1588c277 1024 debug3("%s: session %d pid %d", __func__, s->self, s->pid);
1853d1ef 1025 if (s->ttyfd != -1) {
1588c277 1026 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1853d1ef 1027 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
1028 session_pty_cleanup2(s);
1029 }
1030 s->used = 0;
1031}
1032
1033int
1034mm_answer_pty(int socket, Buffer *m)
1035{
b5a28cbc 1036 extern struct monitor *pmonitor;
1853d1ef 1037 Session *s;
1038 int res, fd0;
1039
1588c277 1040 debug3("%s entering", __func__);
1853d1ef 1041
1042 buffer_clear(m);
1043 s = session_new();
1044 if (s == NULL)
1045 goto error;
1046 s->authctxt = authctxt;
1047 s->pw = authctxt->pw;
b5a28cbc 1048 s->pid = pmonitor->m_pid;
1853d1ef 1049 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1050 if (res == 0)
1051 goto error;
1052 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1053 pty_setowner(authctxt->pw, s->tty);
1054
1055 buffer_put_int(m, 1);
1056 buffer_put_cstring(m, s->tty);
1057 mm_request_send(socket, MONITOR_ANS_PTY, m);
1058
1059 mm_send_fd(socket, s->ptyfd);
1060 mm_send_fd(socket, s->ttyfd);
1061
1062 /* We need to trick ttyslot */
1063 if (dup2(s->ttyfd, 0) == -1)
1588c277 1064 fatal("%s: dup2", __func__);
1853d1ef 1065
1066 mm_record_login(s, authctxt->pw);
1067
1068 /* Now we can close the file descriptor again */
1069 close(0);
1070
1071 /* make sure nothing uses fd 0 */
1072 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1588c277 1073 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1853d1ef 1074 if (fd0 != 0)
1588c277 1075 error("%s: fd0 %d != 0", __func__, fd0);
1853d1ef 1076
1077 /* slave is not needed */
1078 close(s->ttyfd);
1079 s->ttyfd = s->ptyfd;
1080 /* no need to dup() because nobody closes ptyfd */
1081 s->ptymaster = s->ptyfd;
1082
1588c277 1083 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1853d1ef 1084
1085 return (0);
1086
1087 error:
1088 if (s != NULL)
1089 mm_session_close(s);
1090 buffer_put_int(m, 0);
1091 mm_request_send(socket, MONITOR_ANS_PTY, m);
1092 return (0);
1093}
1094
1095int
1096mm_answer_pty_cleanup(int socket, Buffer *m)
1097{
1098 Session *s;
1099 char *tty;
1100
1588c277 1101 debug3("%s entering", __func__);
1853d1ef 1102
1103 tty = buffer_get_string(m, NULL);
1104 if ((s = session_by_tty(tty)) != NULL)
1105 mm_session_close(s);
1106 buffer_clear(m);
1107 xfree(tty);
1108 return (0);
1109}
1110
1111int
1112mm_answer_sesskey(int socket, Buffer *m)
1113{
1114 BIGNUM *p;
1115 int rsafail;
1116
1117 /* Turn off permissions */
1118 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1119
1120 if ((p = BN_new()) == NULL)
1588c277 1121 fatal("%s: BN_new", __func__);
1853d1ef 1122
1123 buffer_get_bignum2(m, p);
1124
1125 rsafail = ssh1_session_key(p);
1126
1127 buffer_clear(m);
1128 buffer_put_int(m, rsafail);
1129 buffer_put_bignum2(m, p);
1130
1131 BN_clear_free(p);
1132
1133 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1134
1135 /* Turn on permissions for sessid passing */
1136 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1137
1138 return (0);
1139}
1140
1141int
1142mm_answer_sessid(int socket, Buffer *m)
1143{
1144 int i;
1145
1588c277 1146 debug3("%s entering", __func__);
1853d1ef 1147
1148 if (buffer_len(m) != 16)
1588c277 1149 fatal("%s: bad ssh1 session id", __func__);
1853d1ef 1150 for (i = 0; i < 16; i++)
1151 session_id[i] = buffer_get_char(m);
1152
1153 /* Turn on permissions for getpwnam */
1154 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1155
1156 return (0);
1157}
1158
1159int
1160mm_answer_rsa_keyallowed(int socket, Buffer *m)
1161{
1162 BIGNUM *client_n;
1163 Key *key = NULL;
1164 u_char *blob = NULL;
1165 u_int blen = 0;
1166 int allowed = 0;
1167
1588c277 1168 debug3("%s entering", __func__);
1853d1ef 1169
aa586f8e 1170 if (options.rsa_authentication && authctxt->valid) {
1853d1ef 1171 if ((client_n = BN_new()) == NULL)
1588c277 1172 fatal("%s: BN_new", __func__);
1853d1ef 1173 buffer_get_bignum2(m, client_n);
1174 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1175 BN_clear_free(client_n);
1176 }
1177 buffer_clear(m);
1178 buffer_put_int(m, allowed);
1179
1180 /* clear temporarily storage (used by generate challenge) */
1181 monitor_reset_key_state();
1182
1183 if (allowed && key != NULL) {
1184 key->type = KEY_RSA; /* cheat for key_to_blob */
1185 if (key_to_blob(key, &blob, &blen) == 0)
1588c277 1186 fatal("%s: key_to_blob failed", __func__);
1853d1ef 1187 buffer_put_string(m, blob, blen);
1188
1189 /* Save temporarily for comparison in verify */
1190 key_blob = blob;
1191 key_bloblen = blen;
1192 key_blobtype = MM_RSAUSERKEY;
1193 key_free(key);
1194 }
1195
1196 mm_append_debug(m);
1197
1198 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1199
1200 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1201 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1202 return (0);
1203}
1204
1205int
1206mm_answer_rsa_challenge(int socket, Buffer *m)
1207{
1208 Key *key = NULL;
1209 u_char *blob;
1210 u_int blen;
1211
1588c277 1212 debug3("%s entering", __func__);
1853d1ef 1213
1214 if (!authctxt->valid)
1588c277 1215 fatal("%s: authctxt not valid", __func__);
1853d1ef 1216 blob = buffer_get_string(m, &blen);
1217 if (!monitor_allowed_key(blob, blen))
1588c277 1218 fatal("%s: bad key, not previously allowed", __func__);
1853d1ef 1219 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1588c277 1220 fatal("%s: key type mismatch", __func__);
1853d1ef 1221 if ((key = key_from_blob(blob, blen)) == NULL)
1588c277 1222 fatal("%s: received bad key", __func__);
1853d1ef 1223
1224 if (ssh1_challenge)
1225 BN_clear_free(ssh1_challenge);
1226 ssh1_challenge = auth_rsa_generate_challenge(key);
1227
1228 buffer_clear(m);
1229 buffer_put_bignum2(m, ssh1_challenge);
1230
1588c277 1231 debug3("%s sending reply", __func__);
1853d1ef 1232 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1233
1234 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1235 return (0);
1236}
1237
1238int
1239mm_answer_rsa_response(int socket, Buffer *m)
1240{
1241 Key *key = NULL;
1242 u_char *blob, *response;
1243 u_int blen, len;
1244 int success;
1245
1588c277 1246 debug3("%s entering", __func__);
1853d1ef 1247
1248 if (!authctxt->valid)
1588c277 1249 fatal("%s: authctxt not valid", __func__);
1853d1ef 1250 if (ssh1_challenge == NULL)
1588c277 1251 fatal("%s: no ssh1_challenge", __func__);
1853d1ef 1252
1253 blob = buffer_get_string(m, &blen);
1254 if (!monitor_allowed_key(blob, blen))
1588c277 1255 fatal("%s: bad key, not previously allowed", __func__);
1853d1ef 1256 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1588c277 1257 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1853d1ef 1258 if ((key = key_from_blob(blob, blen)) == NULL)
1588c277 1259 fatal("%s: received bad key", __func__);
1853d1ef 1260 response = buffer_get_string(m, &len);
1261 if (len != 16)
1588c277 1262 fatal("%s: received bad response to challenge", __func__);
1853d1ef 1263 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1264
1265 key_free(key);
1266 xfree(response);
1267
1268 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1269
1270 /* reset state */
1271 BN_clear_free(ssh1_challenge);
1272 ssh1_challenge = NULL;
1273 monitor_reset_key_state();
1274
1275 buffer_clear(m);
1276 buffer_put_int(m, success);
1277 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1278
1279 return (success);
1280}
1281
1282int
1283mm_answer_term(int socket, Buffer *req)
1284{
b5a28cbc 1285 extern struct monitor *pmonitor;
1853d1ef 1286 int res, status;
1287
1588c277 1288 debug3("%s: tearing down sessions", __func__);
1853d1ef 1289
1290 /* The child is terminating */
1291 session_destroy_all(&mm_session_close);
1292
b5a28cbc 1293 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
8c38e88b 1294 if (errno != EINTR)
1295 exit(1);
1853d1ef 1296
1297 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1298
1299 /* Terminate process */
1300 exit (res);
1301}
1302
1303void
b5a28cbc 1304monitor_apply_keystate(struct monitor *pmonitor)
1853d1ef 1305{
1306 if (compat20) {
1307 set_newkeys(MODE_IN);
1308 set_newkeys(MODE_OUT);
1309 } else {
1853d1ef 1310 packet_set_protocol_flags(child_state.ssh1protoflags);
9459414c 1311 packet_set_encryption_key(child_state.ssh1key,
1312 child_state.ssh1keylen, child_state.ssh1cipher);
1313 xfree(child_state.ssh1key);
1853d1ef 1314 }
1315
9459414c 1316 /* for rc4 and other stateful ciphers */
1853d1ef 1317 packet_set_keycontext(MODE_OUT, child_state.keyout);
1318 xfree(child_state.keyout);
1319 packet_set_keycontext(MODE_IN, child_state.keyin);
1320 xfree(child_state.keyin);
1321
1322 if (!compat20) {
1323 packet_set_iv(MODE_OUT, child_state.ivout);
1324 xfree(child_state.ivout);
1325 packet_set_iv(MODE_IN, child_state.ivin);
1326 xfree(child_state.ivin);
1327 }
1328
1329 memcpy(&incoming_stream, &child_state.incoming,
1330 sizeof(incoming_stream));
1331 memcpy(&outgoing_stream, &child_state.outgoing,
1332 sizeof(outgoing_stream));
1333
1334 /* Update with new address */
0496cf34 1335 if (options.compression)
1336 mm_init_compression(pmonitor->m_zlib);
1853d1ef 1337
1338 /* Network I/O buffers */
1339 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1340 buffer_clear(&input);
1341 buffer_append(&input, child_state.input, child_state.ilen);
1342 memset(child_state.input, 0, child_state.ilen);
1343 xfree(child_state.input);
1344
1345 buffer_clear(&output);
1346 buffer_append(&output, child_state.output, child_state.olen);
1347 memset(child_state.output, 0, child_state.olen);
1348 xfree(child_state.output);
1349}
1350
1351static Kex *
1352mm_get_kex(Buffer *m)
1353{
1354 Kex *kex;
1355 void *blob;
1356 u_int bloblen;
1357
1358 kex = xmalloc(sizeof(*kex));
1359 memset(kex, 0, sizeof(*kex));
1360 kex->session_id = buffer_get_string(m, &kex->session_id_len);
521d606b 1361 if ((session_id2 == NULL) ||
1362 (kex->session_id_len != session_id2_len) ||
1363 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1364 fatal("mm_get_get: internal error: bad session id");
1853d1ef 1365 kex->we_need = buffer_get_int(m);
1366 kex->server = 1;
1367 kex->hostkey_type = buffer_get_int(m);
1368 kex->kex_type = buffer_get_int(m);
1369 blob = buffer_get_string(m, &bloblen);
1370 buffer_init(&kex->my);
1371 buffer_append(&kex->my, blob, bloblen);
1372 xfree(blob);
1373 blob = buffer_get_string(m, &bloblen);
1374 buffer_init(&kex->peer);
1375 buffer_append(&kex->peer, blob, bloblen);
1376 xfree(blob);
1377 kex->done = 1;
1378 kex->flags = buffer_get_int(m);
1379 kex->client_version_string = buffer_get_string(m, NULL);
1380 kex->server_version_string = buffer_get_string(m, NULL);
1381 kex->load_host_key=&get_hostkey_by_type;
1382 kex->host_key_index=&get_hostkey_index;
1383
1384 return (kex);
1385}
1386
1387/* This function requries careful sanity checking */
1388
1389void
b5a28cbc 1390mm_get_keystate(struct monitor *pmonitor)
1853d1ef 1391{
1392 Buffer m;
1393 u_char *blob, *p;
1394 u_int bloblen, plen;
1395
1588c277 1396 debug3("%s: Waiting for new keys", __func__);
1853d1ef 1397
1398 buffer_init(&m);
b5a28cbc 1399 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1853d1ef 1400 if (!compat20) {
1401 child_state.ssh1protoflags = buffer_get_int(&m);
1402 child_state.ssh1cipher = buffer_get_int(&m);
9459414c 1403 child_state.ssh1key = buffer_get_string(&m,
1404 &child_state.ssh1keylen);
1853d1ef 1405 child_state.ivout = buffer_get_string(&m,
1406 &child_state.ivoutlen);
1407 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1408 goto skip;
1409 } else {
1410 /* Get the Kex for rekeying */
b5a28cbc 1411 *pmonitor->m_pkex = mm_get_kex(&m);
1853d1ef 1412 }
1413
1414 blob = buffer_get_string(&m, &bloblen);
1415 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1416 xfree(blob);
1417
1588c277 1418 debug3("%s: Waiting for second key", __func__);
1853d1ef 1419 blob = buffer_get_string(&m, &bloblen);
1420 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1421 xfree(blob);
1422
1423 /* Now get sequence numbers for the packets */
1424 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1425 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1426
1427 skip:
1428 /* Get the key context */
1429 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1430 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1431
1588c277 1432 debug3("%s: Getting compression state", __func__);
1853d1ef 1433 /* Get compression state */
1434 p = buffer_get_string(&m, &plen);
1435 if (plen != sizeof(child_state.outgoing))
1588c277 1436 fatal("%s: bad request size", __func__);
1853d1ef 1437 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1438 xfree(p);
1439
1440 p = buffer_get_string(&m, &plen);
1441 if (plen != sizeof(child_state.incoming))
1588c277 1442 fatal("%s: bad request size", __func__);
1853d1ef 1443 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1444 xfree(p);
1445
1446 /* Network I/O buffers */
1588c277 1447 debug3("%s: Getting Network I/O buffers", __func__);
1853d1ef 1448 child_state.input = buffer_get_string(&m, &child_state.ilen);
1449 child_state.output = buffer_get_string(&m, &child_state.olen);
1450
1451 buffer_free(&m);
1452}
1453
1454
1455/* Allocation functions for zlib */
1456void *
1457mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1458{
1459 void *address;
1460
1461 address = mm_malloc(mm, size * ncount);
1462
1463 return (address);
1464}
1465
1466void
1467mm_zfree(struct mm_master *mm, void *address)
1468{
1469 mm_free(mm, address);
1470}
1471
1472void
1473mm_init_compression(struct mm_master *mm)
1474{
1475 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1476 outgoing_stream.zfree = (free_func)mm_zfree;
1477 outgoing_stream.opaque = mm;
1478
1479 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1480 incoming_stream.zfree = (free_func)mm_zfree;
1481 incoming_stream.opaque = mm;
1482}
1483
1484/* XXX */
1485
1486#define FD_CLOSEONEXEC(x) do { \
1487 if (fcntl(x, F_SETFD, 1) == -1) \
1488 fatal("fcntl(%d, F_SETFD)", x); \
1489} while (0)
1490
1491static void
1492monitor_socketpair(int *pair)
1493{
f1af2dbf 1494#ifdef HAVE_SOCKETPAIR
1853d1ef 1495 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1588c277 1496 fatal("%s: socketpair", __func__);
f1af2dbf 1497#else
1498 fatal("%s: UsePrivilegeSeparation=yes not supported",
1588c277 1499 __func__);
f1af2dbf 1500#endif
1853d1ef 1501 FD_CLOSEONEXEC(pair[0]);
1502 FD_CLOSEONEXEC(pair[1]);
1503}
1504
1505#define MM_MEMSIZE 65536
1506
1507struct monitor *
1508monitor_init(void)
1509{
1510 struct monitor *mon;
1511 int pair[2];
1512
1513 mon = xmalloc(sizeof(*mon));
1514
1515 monitor_socketpair(pair);
1516
1517 mon->m_recvfd = pair[0];
1518 mon->m_sendfd = pair[1];
1519
1520 /* Used to share zlib space across processes */
0496cf34 1521 if (options.compression) {
1522 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1523 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1853d1ef 1524
0496cf34 1525 /* Compression needs to share state across borders */
1526 mm_init_compression(mon->m_zlib);
1527 }
1853d1ef 1528
1529 return mon;
1530}
1531
1532void
1533monitor_reinit(struct monitor *mon)
1534{
1535 int pair[2];
1536
1537 monitor_socketpair(pair);
1538
1539 mon->m_recvfd = pair[0];
1540 mon->m_sendfd = pair[1];
1541}
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