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- itojun@cvs.openbsd.org 2002/09/09 06:48:06
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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"
696f6bef 28RCSID("$OpenBSD: monitor.c,v 1.25 2002/09/09 06:48:06 itojun 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
696f6bef 123#ifdef KRB5
124int mm_answer_krb5(int, Buffer *);
125#endif
126
1853d1ef 127static Authctxt *authctxt;
128static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
129
130/* local state for key verify */
131static u_char *key_blob = NULL;
132static u_int key_bloblen = 0;
133static int key_blobtype = MM_NOKEY;
134static u_char *hostbased_cuser = NULL;
135static u_char *hostbased_chost = NULL;
136static char *auth_method = "unknown";
521d606b 137static int session_id2_len = 0;
138static u_char *session_id2 = NULL;
1853d1ef 139
140struct mon_table {
141 enum monitor_reqtype type;
142 int flags;
143 int (*f)(int, Buffer *);
144};
145
146#define MON_ISAUTH 0x0004 /* Required for Authentication */
147#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
148#define MON_ONCE 0x0010 /* Disable after calling */
149
150#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
151
152#define MON_PERMIT 0x1000 /* Request is permitted */
153
154struct mon_table mon_dispatch_proto20[] = {
155 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
156 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
157 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
158 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
94a73cdc 159 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1853d1ef 160 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
ad200abb 161#ifdef USE_PAM
162 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
8b314ec9 163#endif
1853d1ef 164#ifdef BSD_AUTH
165 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
166 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
167#endif
168#ifdef SKEY
169 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
170 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
171#endif
172 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
173 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
174 {0, 0, NULL}
175};
176
177struct mon_table mon_dispatch_postauth20[] = {
178 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
179 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
180 {MONITOR_REQ_PTY, 0, mm_answer_pty},
181 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
182 {MONITOR_REQ_TERM, 0, mm_answer_term},
183 {0, 0, NULL}
184};
185
186struct mon_table mon_dispatch_proto15[] = {
187 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
188 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
189 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
190 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
191 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
192 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
193 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
194 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
195#ifdef BSD_AUTH
196 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
197 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
198#endif
199#ifdef SKEY
200 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
201 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
efe44db6 202#endif
203#ifdef USE_PAM
204 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
696f6bef 205#endif
206#ifdef KRB5
207 {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5},
1853d1ef 208#endif
209 {0, 0, NULL}
210};
211
212struct mon_table mon_dispatch_postauth15[] = {
213 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
214 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
215 {MONITOR_REQ_TERM, 0, mm_answer_term},
216 {0, 0, NULL}
217};
218
219struct mon_table *mon_dispatch;
220
221/* Specifies if a certain message is allowed at the moment */
222
223static void
224monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
225{
226 while (ent->f != NULL) {
227 if (ent->type == type) {
228 ent->flags &= ~MON_PERMIT;
229 ent->flags |= permit ? MON_PERMIT : 0;
230 return;
231 }
232 ent++;
233 }
234}
235
236static void
237monitor_permit_authentications(int permit)
238{
239 struct mon_table *ent = mon_dispatch;
240
241 while (ent->f != NULL) {
242 if (ent->flags & MON_AUTH) {
243 ent->flags &= ~MON_PERMIT;
244 ent->flags |= permit ? MON_PERMIT : 0;
245 }
246 ent++;
247 }
248}
249
250Authctxt *
b5a28cbc 251monitor_child_preauth(struct monitor *pmonitor)
1853d1ef 252{
253 struct mon_table *ent;
254 int authenticated = 0;
255
256 debug3("preauth child monitor started");
257
258 if (compat20) {
259 mon_dispatch = mon_dispatch_proto20;
260
261 /* Permit requests for moduli and signatures */
262 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
263 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
264 } else {
265 mon_dispatch = mon_dispatch_proto15;
266
267 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
268 }
269
270 authctxt = authctxt_new();
271
272 /* The first few requests do not require asynchronous access */
273 while (!authenticated) {
b5a28cbc 274 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
1853d1ef 275 if (authenticated) {
276 if (!(ent->flags & MON_AUTHDECIDE))
277 fatal("%s: unexpected authentication from %d",
1588c277 278 __func__, ent->type);
1853d1ef 279 if (authctxt->pw->pw_uid == 0 &&
280 !auth_root_allowed(auth_method))
281 authenticated = 0;
ad200abb 282#ifdef USE_PAM
283 if (!do_pam_account(authctxt->pw->pw_name, NULL))
284 authenticated = 0;
285#endif
1853d1ef 286 }
287
288 if (ent->flags & MON_AUTHDECIDE) {
289 auth_log(authctxt, authenticated, auth_method,
290 compat20 ? " ssh2" : "");
291 if (!authenticated)
292 authctxt->failures++;
293 }
294 }
295
296 if (!authctxt->valid)
1588c277 297 fatal("%s: authenticated invalid user", __func__);
1853d1ef 298
299 debug("%s: %s has been authenticated by privileged process",
1588c277 300 __func__, authctxt->user);
1853d1ef 301
b5a28cbc 302 mm_get_keystate(pmonitor);
1853d1ef 303
304 return (authctxt);
305}
306
307void
b5a28cbc 308monitor_child_postauth(struct monitor *pmonitor)
1853d1ef 309{
310 if (compat20) {
311 mon_dispatch = mon_dispatch_postauth20;
312
313 /* Permit requests for moduli and signatures */
314 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
315 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
316 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
317
318 } else {
319 mon_dispatch = mon_dispatch_postauth15;
320 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
321 }
322 if (!no_pty_flag) {
323 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
324 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
325 }
326
327 for (;;)
b5a28cbc 328 monitor_read(pmonitor, mon_dispatch, NULL);
1853d1ef 329}
330
331void
b5a28cbc 332monitor_sync(struct monitor *pmonitor)
1853d1ef 333{
0496cf34 334 if (options.compression) {
335 /* The member allocation is not visible, so sync it */
336 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
337 }
1853d1ef 338}
339
340int
b5a28cbc 341monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1853d1ef 342 struct mon_table **pent)
343{
344 Buffer m;
345 int ret;
346 u_char type;
347
348 buffer_init(&m);
349
b5a28cbc 350 mm_request_receive(pmonitor->m_sendfd, &m);
1853d1ef 351 type = buffer_get_char(&m);
352
1588c277 353 debug3("%s: checking request %d", __func__, type);
1853d1ef 354
355 while (ent->f != NULL) {
356 if (ent->type == type)
357 break;
358 ent++;
359 }
360
361 if (ent->f != NULL) {
362 if (!(ent->flags & MON_PERMIT))
1588c277 363 fatal("%s: unpermitted request %d", __func__,
1853d1ef 364 type);
b5a28cbc 365 ret = (*ent->f)(pmonitor->m_sendfd, &m);
1853d1ef 366 buffer_free(&m);
367
368 /* The child may use this request only once, disable it */
369 if (ent->flags & MON_ONCE) {
1588c277 370 debug2("%s: %d used once, disabling now", __func__,
1853d1ef 371 type);
372 ent->flags &= ~MON_PERMIT;
373 }
374
375 if (pent != NULL)
376 *pent = ent;
377
378 return ret;
379 }
380
1588c277 381 fatal("%s: unsupported request: %d", __func__, type);
1853d1ef 382
383 /* NOTREACHED */
384 return (-1);
385}
386
387/* allowed key state */
388static int
389monitor_allowed_key(u_char *blob, u_int bloblen)
390{
391 /* make sure key is allowed */
392 if (key_blob == NULL || key_bloblen != bloblen ||
393 memcmp(key_blob, blob, key_bloblen))
394 return (0);
395 return (1);
396}
397
398static void
399monitor_reset_key_state(void)
400{
401 /* reset state */
402 if (key_blob != NULL)
403 xfree(key_blob);
404 if (hostbased_cuser != NULL)
405 xfree(hostbased_cuser);
406 if (hostbased_chost != NULL)
407 xfree(hostbased_chost);
408 key_blob = NULL;
409 key_bloblen = 0;
410 key_blobtype = MM_NOKEY;
411 hostbased_cuser = NULL;
412 hostbased_chost = NULL;
413}
414
415int
416mm_answer_moduli(int socket, Buffer *m)
417{
418 DH *dh;
419 int min, want, max;
420
421 min = buffer_get_int(m);
422 want = buffer_get_int(m);
423 max = buffer_get_int(m);
424
425 debug3("%s: got parameters: %d %d %d",
1588c277 426 __func__, min, want, max);
1853d1ef 427 /* We need to check here, too, in case the child got corrupted */
428 if (max < min || want < min || max < want)
429 fatal("%s: bad parameters: %d %d %d",
1588c277 430 __func__, min, want, max);
1853d1ef 431
432 buffer_clear(m);
433
434 dh = choose_dh(min, want, max);
435 if (dh == NULL) {
436 buffer_put_char(m, 0);
437 return (0);
438 } else {
439 /* Send first bignum */
440 buffer_put_char(m, 1);
441 buffer_put_bignum2(m, dh->p);
442 buffer_put_bignum2(m, dh->g);
443
444 DH_free(dh);
445 }
446 mm_request_send(socket, MONITOR_ANS_MODULI, m);
447 return (0);
448}
449
450int
451mm_answer_sign(int socket, Buffer *m)
452{
453 Key *key;
454 u_char *p;
455 u_char *signature;
456 u_int siglen, datlen;
457 int keyid;
458
1588c277 459 debug3("%s", __func__);
1853d1ef 460
461 keyid = buffer_get_int(m);
462 p = buffer_get_string(m, &datlen);
463
464 if (datlen != 20)
d1ff09ba 465 fatal("%s: data length incorrect: %u", __func__, datlen);
1853d1ef 466
521d606b 467 /* save session id, it will be passed on the first call */
468 if (session_id2_len == 0) {
469 session_id2_len = datlen;
470 session_id2 = xmalloc(session_id2_len);
471 memcpy(session_id2, p, session_id2_len);
472 }
473
1853d1ef 474 if ((key = get_hostkey_by_index(keyid)) == NULL)
1588c277 475 fatal("%s: no hostkey from index %d", __func__, keyid);
1853d1ef 476 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
1588c277 477 fatal("%s: key_sign failed", __func__);
1853d1ef 478
d1ff09ba 479 debug3("%s: signature %p(%u)", __func__, signature, siglen);
1853d1ef 480
481 buffer_clear(m);
482 buffer_put_string(m, signature, siglen);
483
484 xfree(p);
485 xfree(signature);
486
487 mm_request_send(socket, MONITOR_ANS_SIGN, m);
488
489 /* Turn on permissions for getpwnam */
490 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
491
492 return (0);
493}
494
495/* Retrieves the password entry and also checks if the user is permitted */
496
497int
498mm_answer_pwnamallow(int socket, Buffer *m)
499{
500 char *login;
501 struct passwd *pwent;
502 int allowed = 0;
503
1588c277 504 debug3("%s", __func__);
1853d1ef 505
506 if (authctxt->attempt++ != 0)
1588c277 507 fatal("%s: multiple attempts for getpwnam", __func__);
1853d1ef 508
509 login = buffer_get_string(m, NULL);
510
511 pwent = getpwnamallow(login);
512
513 authctxt->user = xstrdup(login);
514 setproctitle("%s [priv]", pwent ? login : "unknown");
515 xfree(login);
516
517 buffer_clear(m);
518
519 if (pwent == NULL) {
520 buffer_put_char(m, 0);
521 goto out;
522 }
523
524 allowed = 1;
525 authctxt->pw = pwent;
526 authctxt->valid = 1;
527
528 buffer_put_char(m, 1);
529 buffer_put_string(m, pwent, sizeof(struct passwd));
530 buffer_put_cstring(m, pwent->pw_name);
531 buffer_put_cstring(m, "*");
532 buffer_put_cstring(m, pwent->pw_gecos);
7b18c353 533#ifdef HAVE_PW_CLASS_IN_PASSWD
1853d1ef 534 buffer_put_cstring(m, pwent->pw_class);
7b18c353 535#endif
1853d1ef 536 buffer_put_cstring(m, pwent->pw_dir);
537 buffer_put_cstring(m, pwent->pw_shell);
538
539 out:
1588c277 540 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1853d1ef 541 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
542
543 /* For SSHv1 allow authentication now */
544 if (!compat20)
545 monitor_permit_authentications(1);
94a73cdc 546 else {
1853d1ef 547 /* Allow service/style information on the auth context */
548 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
94a73cdc 549 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
550 }
1853d1ef 551
efe44db6 552#ifdef USE_PAM
553 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
554#endif
1853d1ef 555
556 return (0);
557}
558
94a73cdc 559int mm_answer_auth2_read_banner(int socket, Buffer *m)
560{
561 char *banner;
562
563 buffer_clear(m);
564 banner = auth2_read_banner();
565 buffer_put_cstring(m, banner != NULL ? banner : "");
566 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
567
568 if (banner != NULL)
30e37ee6 569 xfree(banner);
94a73cdc 570
571 return (0);
572}
573
1853d1ef 574int
575mm_answer_authserv(int socket, Buffer *m)
576{
577 monitor_permit_authentications(1);
578
579 authctxt->service = buffer_get_string(m, NULL);
580 authctxt->style = buffer_get_string(m, NULL);
581 debug3("%s: service=%s, style=%s",
1588c277 582 __func__, authctxt->service, authctxt->style);
1853d1ef 583
584 if (strlen(authctxt->style) == 0) {
585 xfree(authctxt->style);
586 authctxt->style = NULL;
587 }
588
589 return (0);
590}
591
592int
593mm_answer_authpassword(int socket, Buffer *m)
594{
595 static int call_count;
596 char *passwd;
d341742a 597 int authenticated;
598 u_int plen;
1853d1ef 599
600 passwd = buffer_get_string(m, &plen);
601 /* Only authenticate if the context is valid */
aa586f8e 602 authenticated = options.password_authentication &&
603 authctxt->valid && auth_password(authctxt, passwd);
1853d1ef 604 memset(passwd, 0, strlen(passwd));
605 xfree(passwd);
606
607 buffer_clear(m);
608 buffer_put_int(m, authenticated);
609
1588c277 610 debug3("%s: sending result %d", __func__, authenticated);
1853d1ef 611 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
612
613 call_count++;
614 if (plen == 0 && call_count == 1)
615 auth_method = "none";
616 else
617 auth_method = "password";
618
619 /* Causes monitor loop to terminate if authenticated */
620 return (authenticated);
621}
622
623#ifdef BSD_AUTH
624int
625mm_answer_bsdauthquery(int socket, Buffer *m)
626{
627 char *name, *infotxt;
628 u_int numprompts;
629 u_int *echo_on;
630 char **prompts;
631 int res;
632
633 res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
634 &prompts, &echo_on);
635
636 buffer_clear(m);
637 buffer_put_int(m, res);
638 if (res != -1)
639 buffer_put_cstring(m, prompts[0]);
640
1588c277 641 debug3("%s: sending challenge res: %d", __func__, res);
1853d1ef 642 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
643
644 if (res != -1) {
645 xfree(name);
646 xfree(infotxt);
647 xfree(prompts);
648 xfree(echo_on);
649 }
650
651 return (0);
652}
653
654int
655mm_answer_bsdauthrespond(int socket, Buffer *m)
656{
657 char *response;
658 int authok;
659
660 if (authctxt->as == 0)
1588c277 661 fatal("%s: no bsd auth session", __func__);
1853d1ef 662
663 response = buffer_get_string(m, NULL);
aa586f8e 664 authok = options.challenge_response_authentication &&
665 auth_userresponse(authctxt->as, response, 0);
1853d1ef 666 authctxt->as = NULL;
1588c277 667 debug3("%s: <%s> = <%d>", __func__, response, authok);
1853d1ef 668 xfree(response);
669
670 buffer_clear(m);
671 buffer_put_int(m, authok);
672
1588c277 673 debug3("%s: sending authenticated: %d", __func__, authok);
1853d1ef 674 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
675
676 auth_method = "bsdauth";
677
678 return (authok != 0);
679}
680#endif
681
682#ifdef SKEY
683int
684mm_answer_skeyquery(int socket, Buffer *m)
685{
686 struct skey skey;
687 char challenge[1024];
688 int res;
689
690 res = skeychallenge(&skey, authctxt->user, challenge);
691
692 buffer_clear(m);
693 buffer_put_int(m, res);
694 if (res != -1)
695 buffer_put_cstring(m, challenge);
696
1588c277 697 debug3("%s: sending challenge res: %d", __func__, res);
1853d1ef 698 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
699
700 return (0);
701}
702
703int
704mm_answer_skeyrespond(int socket, Buffer *m)
705{
706 char *response;
707 int authok;
708
709 response = buffer_get_string(m, NULL);
710
aa586f8e 711 authok = (options.challenge_response_authentication &&
712 authctxt->valid &&
1853d1ef 713 skey_haskey(authctxt->pw->pw_name) == 0 &&
714 skey_passcheck(authctxt->pw->pw_name, response) != -1);
715
716 xfree(response);
717
718 buffer_clear(m);
719 buffer_put_int(m, authok);
720
1588c277 721 debug3("%s: sending authenticated: %d", __func__, authok);
1853d1ef 722 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
723
724 auth_method = "skey";
725
726 return (authok != 0);
727}
728#endif
729
ad200abb 730#ifdef USE_PAM
731int
732mm_answer_pam_start(int socket, Buffer *m)
733{
734 char *user;
735
736 user = buffer_get_string(m, NULL);
737
738 start_pam(user);
739
740 xfree(user);
741
742 return (0);
743}
744#endif
745
1853d1ef 746static void
747mm_append_debug(Buffer *m)
748{
749 if (auth_debug_init && buffer_len(&auth_debug)) {
1588c277 750 debug3("%s: Appending debug messages for child", __func__);
1853d1ef 751 buffer_append(m, buffer_ptr(&auth_debug),
752 buffer_len(&auth_debug));
753 buffer_clear(&auth_debug);
754 }
755}
756
757int
758mm_answer_keyallowed(int socket, Buffer *m)
759{
760 Key *key;
761 u_char *cuser, *chost, *blob;
762 u_int bloblen;
763 enum mm_keytype type = 0;
764 int allowed = 0;
765
1588c277 766 debug3("%s entering", __func__);
1853d1ef 767
768 type = buffer_get_int(m);
769 cuser = buffer_get_string(m, NULL);
770 chost = buffer_get_string(m, NULL);
771 blob = buffer_get_string(m, &bloblen);
772
773 key = key_from_blob(blob, bloblen);
774
775 if ((compat20 && type == MM_RSAHOSTKEY) ||
776 (!compat20 && type != MM_RSAHOSTKEY))
1588c277 777 fatal("%s: key type and protocol mismatch", __func__);
1853d1ef 778
1588c277 779 debug3("%s: key_from_blob: %p", __func__, key);
1853d1ef 780
781 if (key != NULL && authctxt->pw != NULL) {
782 switch(type) {
783 case MM_USERKEY:
aa586f8e 784 allowed = options.pubkey_authentication &&
785 user_key_allowed(authctxt->pw, key);
1853d1ef 786 break;
787 case MM_HOSTKEY:
aa586f8e 788 allowed = options.hostbased_authentication &&
789 hostbased_key_allowed(authctxt->pw,
1853d1ef 790 cuser, chost, key);
791 break;
792 case MM_RSAHOSTKEY:
793 key->type = KEY_RSA1; /* XXX */
aa586f8e 794 allowed = options.rhosts_rsa_authentication &&
795 auth_rhosts_rsa_key_allowed(authctxt->pw,
1853d1ef 796 cuser, chost, key);
797 break;
798 default:
1588c277 799 fatal("%s: unknown key type %d", __func__, type);
1853d1ef 800 break;
801 }
802 key_free(key);
803 }
804
805 /* clear temporarily storage (used by verify) */
806 monitor_reset_key_state();
807
808 if (allowed) {
809 /* Save temporarily for comparison in verify */
810 key_blob = blob;
811 key_bloblen = bloblen;
812 key_blobtype = type;
813 hostbased_cuser = cuser;
814 hostbased_chost = chost;
815 }
816
817 debug3("%s: key %p is %s",
1588c277 818 __func__, key, allowed ? "allowed" : "disallowed");
1853d1ef 819
820 buffer_clear(m);
821 buffer_put_int(m, allowed);
822
823 mm_append_debug(m);
824
825 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
826
827 if (type == MM_RSAHOSTKEY)
828 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
829
830 return (0);
831}
832
833static int
834monitor_valid_userblob(u_char *data, u_int datalen)
835{
836 Buffer b;
837 u_char *p;
838 u_int len;
839 int fail = 0;
1853d1ef 840
841 buffer_init(&b);
842 buffer_append(&b, data, datalen);
843
844 if (datafellows & SSH_OLD_SESSIONID) {
521d606b 845 p = buffer_ptr(&b);
846 len = buffer_len(&b);
847 if ((session_id2 == NULL) ||
848 (len < session_id2_len) ||
849 (memcmp(p, session_id2, session_id2_len) != 0))
850 fail++;
1853d1ef 851 buffer_consume(&b, session_id2_len);
852 } else {
521d606b 853 p = buffer_get_string(&b, &len);
854 if ((session_id2 == NULL) ||
855 (len != session_id2_len) ||
856 (memcmp(p, session_id2, session_id2_len) != 0))
1853d1ef 857 fail++;
521d606b 858 xfree(p);
1853d1ef 859 }
860 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
861 fail++;
862 p = buffer_get_string(&b, NULL);
863 if (strcmp(authctxt->user, p) != 0) {
864 log("wrong user name passed to monitor: expected %s != %.100s",
865 authctxt->user, p);
866 fail++;
867 }
868 xfree(p);
869 buffer_skip_string(&b);
870 if (datafellows & SSH_BUG_PKAUTH) {
871 if (!buffer_get_char(&b))
872 fail++;
873 } else {
874 p = buffer_get_string(&b, NULL);
875 if (strcmp("publickey", p) != 0)
876 fail++;
877 xfree(p);
878 if (!buffer_get_char(&b))
879 fail++;
880 buffer_skip_string(&b);
881 }
882 buffer_skip_string(&b);
883 if (buffer_len(&b) != 0)
884 fail++;
885 buffer_free(&b);
886 return (fail == 0);
887}
888
889static int
890monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
891 u_char *chost)
892{
893 Buffer b;
894 u_char *p;
895 u_int len;
896 int fail = 0;
1853d1ef 897
898 buffer_init(&b);
899 buffer_append(&b, data, datalen);
900
521d606b 901 p = buffer_get_string(&b, &len);
902 if ((session_id2 == NULL) ||
903 (len != session_id2_len) ||
904 (memcmp(p, session_id2, session_id2_len) != 0))
1853d1ef 905 fail++;
521d606b 906 xfree(p);
907
1853d1ef 908 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
909 fail++;
910 p = buffer_get_string(&b, NULL);
911 if (strcmp(authctxt->user, p) != 0) {
912 log("wrong user name passed to monitor: expected %s != %.100s",
913 authctxt->user, p);
914 fail++;
915 }
916 xfree(p);
917 buffer_skip_string(&b); /* service */
918 p = buffer_get_string(&b, NULL);
919 if (strcmp(p, "hostbased") != 0)
920 fail++;
921 xfree(p);
922 buffer_skip_string(&b); /* pkalg */
923 buffer_skip_string(&b); /* pkblob */
924
925 /* verify client host, strip trailing dot if necessary */
926 p = buffer_get_string(&b, NULL);
927 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
928 p[len - 1] = '\0';
929 if (strcmp(p, chost) != 0)
930 fail++;
931 xfree(p);
932
933 /* verify client user */
934 p = buffer_get_string(&b, NULL);
935 if (strcmp(p, cuser) != 0)
936 fail++;
937 xfree(p);
938
939 if (buffer_len(&b) != 0)
940 fail++;
941 buffer_free(&b);
942 return (fail == 0);
943}
944
945int
946mm_answer_keyverify(int socket, Buffer *m)
947{
948 Key *key;
949 u_char *signature, *data, *blob;
950 u_int signaturelen, datalen, bloblen;
951 int verified = 0;
952 int valid_data = 0;
953
954 blob = buffer_get_string(m, &bloblen);
955 signature = buffer_get_string(m, &signaturelen);
956 data = buffer_get_string(m, &datalen);
957
958 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
300e01c4 959 !monitor_allowed_key(blob, bloblen))
1588c277 960 fatal("%s: bad key, not previously allowed", __func__);
1853d1ef 961
962 key = key_from_blob(blob, bloblen);
963 if (key == NULL)
1588c277 964 fatal("%s: bad public key blob", __func__);
1853d1ef 965
966 switch (key_blobtype) {
967 case MM_USERKEY:
968 valid_data = monitor_valid_userblob(data, datalen);
969 break;
970 case MM_HOSTKEY:
971 valid_data = monitor_valid_hostbasedblob(data, datalen,
972 hostbased_cuser, hostbased_chost);
973 break;
974 default:
975 valid_data = 0;
976 break;
977 }
978 if (!valid_data)
1588c277 979 fatal("%s: bad signature data blob", __func__);
1853d1ef 980
981 verified = key_verify(key, signature, signaturelen, data, datalen);
982 debug3("%s: key %p signature %s",
1588c277 983 __func__, key, verified ? "verified" : "unverified");
1853d1ef 984
985 key_free(key);
986 xfree(blob);
987 xfree(signature);
988 xfree(data);
989
d17ef027 990 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
991
1853d1ef 992 monitor_reset_key_state();
993
994 buffer_clear(m);
995 buffer_put_int(m, verified);
996 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
997
1853d1ef 998 return (verified);
999}
1000
1001static void
1002mm_record_login(Session *s, struct passwd *pw)
1003{
1004 socklen_t fromlen;
1005 struct sockaddr_storage from;
1006
1007 /*
1008 * Get IP address of client. If the connection is not a socket, let
1009 * the address be 0.0.0.0.
1010 */
1011 memset(&from, 0, sizeof(from));
ba1566dd 1012 fromlen = sizeof(from);
1853d1ef 1013 if (packet_connection_is_on_socket()) {
1853d1ef 1014 if (getpeername(packet_get_connection_in(),
1015 (struct sockaddr *) & from, &fromlen) < 0) {
1016 debug("getpeername: %.100s", strerror(errno));
1017 fatal_cleanup();
1018 }
1019 }
1020 /* Record that there was a login on that tty from the remote host. */
1021 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1022 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
ba1566dd 1023 (struct sockaddr *)&from, fromlen);
1853d1ef 1024}
1025
1026static void
1027mm_session_close(Session *s)
1028{
1588c277 1029 debug3("%s: session %d pid %d", __func__, s->self, s->pid);
1853d1ef 1030 if (s->ttyfd != -1) {
1588c277 1031 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1853d1ef 1032 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
1033 session_pty_cleanup2(s);
1034 }
1035 s->used = 0;
1036}
1037
1038int
1039mm_answer_pty(int socket, Buffer *m)
1040{
b5a28cbc 1041 extern struct monitor *pmonitor;
1853d1ef 1042 Session *s;
1043 int res, fd0;
1044
1588c277 1045 debug3("%s entering", __func__);
1853d1ef 1046
1047 buffer_clear(m);
1048 s = session_new();
1049 if (s == NULL)
1050 goto error;
1051 s->authctxt = authctxt;
1052 s->pw = authctxt->pw;
b5a28cbc 1053 s->pid = pmonitor->m_pid;
1853d1ef 1054 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1055 if (res == 0)
1056 goto error;
1057 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1058 pty_setowner(authctxt->pw, s->tty);
1059
1060 buffer_put_int(m, 1);
1061 buffer_put_cstring(m, s->tty);
1062 mm_request_send(socket, MONITOR_ANS_PTY, m);
1063
1064 mm_send_fd(socket, s->ptyfd);
1065 mm_send_fd(socket, s->ttyfd);
1066
1067 /* We need to trick ttyslot */
1068 if (dup2(s->ttyfd, 0) == -1)
1588c277 1069 fatal("%s: dup2", __func__);
1853d1ef 1070
1071 mm_record_login(s, authctxt->pw);
1072
1073 /* Now we can close the file descriptor again */
1074 close(0);
1075
1076 /* make sure nothing uses fd 0 */
1077 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1588c277 1078 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1853d1ef 1079 if (fd0 != 0)
1588c277 1080 error("%s: fd0 %d != 0", __func__, fd0);
1853d1ef 1081
1082 /* slave is not needed */
1083 close(s->ttyfd);
1084 s->ttyfd = s->ptyfd;
1085 /* no need to dup() because nobody closes ptyfd */
1086 s->ptymaster = s->ptyfd;
1087
1588c277 1088 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1853d1ef 1089
1090 return (0);
1091
1092 error:
1093 if (s != NULL)
1094 mm_session_close(s);
1095 buffer_put_int(m, 0);
1096 mm_request_send(socket, MONITOR_ANS_PTY, m);
1097 return (0);
1098}
1099
1100int
1101mm_answer_pty_cleanup(int socket, Buffer *m)
1102{
1103 Session *s;
1104 char *tty;
1105
1588c277 1106 debug3("%s entering", __func__);
1853d1ef 1107
1108 tty = buffer_get_string(m, NULL);
1109 if ((s = session_by_tty(tty)) != NULL)
1110 mm_session_close(s);
1111 buffer_clear(m);
1112 xfree(tty);
1113 return (0);
1114}
1115
1116int
1117mm_answer_sesskey(int socket, Buffer *m)
1118{
1119 BIGNUM *p;
1120 int rsafail;
1121
1122 /* Turn off permissions */
1123 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1124
1125 if ((p = BN_new()) == NULL)
1588c277 1126 fatal("%s: BN_new", __func__);
1853d1ef 1127
1128 buffer_get_bignum2(m, p);
1129
1130 rsafail = ssh1_session_key(p);
1131
1132 buffer_clear(m);
1133 buffer_put_int(m, rsafail);
1134 buffer_put_bignum2(m, p);
1135
1136 BN_clear_free(p);
1137
1138 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1139
1140 /* Turn on permissions for sessid passing */
1141 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1142
1143 return (0);
1144}
1145
1146int
1147mm_answer_sessid(int socket, Buffer *m)
1148{
1149 int i;
1150
1588c277 1151 debug3("%s entering", __func__);
1853d1ef 1152
1153 if (buffer_len(m) != 16)
1588c277 1154 fatal("%s: bad ssh1 session id", __func__);
1853d1ef 1155 for (i = 0; i < 16; i++)
1156 session_id[i] = buffer_get_char(m);
1157
1158 /* Turn on permissions for getpwnam */
1159 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1160
1161 return (0);
1162}
1163
1164int
1165mm_answer_rsa_keyallowed(int socket, Buffer *m)
1166{
1167 BIGNUM *client_n;
1168 Key *key = NULL;
1169 u_char *blob = NULL;
1170 u_int blen = 0;
1171 int allowed = 0;
1172
1588c277 1173 debug3("%s entering", __func__);
1853d1ef 1174
aa586f8e 1175 if (options.rsa_authentication && authctxt->valid) {
1853d1ef 1176 if ((client_n = BN_new()) == NULL)
1588c277 1177 fatal("%s: BN_new", __func__);
1853d1ef 1178 buffer_get_bignum2(m, client_n);
1179 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1180 BN_clear_free(client_n);
1181 }
1182 buffer_clear(m);
1183 buffer_put_int(m, allowed);
1184
1185 /* clear temporarily storage (used by generate challenge) */
1186 monitor_reset_key_state();
1187
1188 if (allowed && key != NULL) {
1189 key->type = KEY_RSA; /* cheat for key_to_blob */
1190 if (key_to_blob(key, &blob, &blen) == 0)
1588c277 1191 fatal("%s: key_to_blob failed", __func__);
1853d1ef 1192 buffer_put_string(m, blob, blen);
1193
1194 /* Save temporarily for comparison in verify */
1195 key_blob = blob;
1196 key_bloblen = blen;
1197 key_blobtype = MM_RSAUSERKEY;
1198 key_free(key);
1199 }
1200
1201 mm_append_debug(m);
1202
1203 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1204
1205 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1206 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1207 return (0);
1208}
1209
1210int
1211mm_answer_rsa_challenge(int socket, Buffer *m)
1212{
1213 Key *key = NULL;
1214 u_char *blob;
1215 u_int blen;
1216
1588c277 1217 debug3("%s entering", __func__);
1853d1ef 1218
1219 if (!authctxt->valid)
1588c277 1220 fatal("%s: authctxt not valid", __func__);
1853d1ef 1221 blob = buffer_get_string(m, &blen);
1222 if (!monitor_allowed_key(blob, blen))
1588c277 1223 fatal("%s: bad key, not previously allowed", __func__);
1853d1ef 1224 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1588c277 1225 fatal("%s: key type mismatch", __func__);
1853d1ef 1226 if ((key = key_from_blob(blob, blen)) == NULL)
1588c277 1227 fatal("%s: received bad key", __func__);
1853d1ef 1228
1229 if (ssh1_challenge)
1230 BN_clear_free(ssh1_challenge);
1231 ssh1_challenge = auth_rsa_generate_challenge(key);
1232
1233 buffer_clear(m);
1234 buffer_put_bignum2(m, ssh1_challenge);
1235
1588c277 1236 debug3("%s sending reply", __func__);
1853d1ef 1237 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1238
1239 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1240 return (0);
1241}
1242
1243int
1244mm_answer_rsa_response(int socket, Buffer *m)
1245{
1246 Key *key = NULL;
1247 u_char *blob, *response;
1248 u_int blen, len;
1249 int success;
1250
1588c277 1251 debug3("%s entering", __func__);
1853d1ef 1252
1253 if (!authctxt->valid)
1588c277 1254 fatal("%s: authctxt not valid", __func__);
1853d1ef 1255 if (ssh1_challenge == NULL)
1588c277 1256 fatal("%s: no ssh1_challenge", __func__);
1853d1ef 1257
1258 blob = buffer_get_string(m, &blen);
1259 if (!monitor_allowed_key(blob, blen))
1588c277 1260 fatal("%s: bad key, not previously allowed", __func__);
1853d1ef 1261 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1588c277 1262 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1853d1ef 1263 if ((key = key_from_blob(blob, blen)) == NULL)
1588c277 1264 fatal("%s: received bad key", __func__);
1853d1ef 1265 response = buffer_get_string(m, &len);
1266 if (len != 16)
1588c277 1267 fatal("%s: received bad response to challenge", __func__);
1853d1ef 1268 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1269
1270 key_free(key);
1271 xfree(response);
1272
1273 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1274
1275 /* reset state */
1276 BN_clear_free(ssh1_challenge);
1277 ssh1_challenge = NULL;
1278 monitor_reset_key_state();
1279
1280 buffer_clear(m);
1281 buffer_put_int(m, success);
1282 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1283
1284 return (success);
1285}
1286
696f6bef 1287
1288#ifdef KRB5
1289int
1290mm_answer_krb5(int socket, Buffer *m)
1291{
1292 krb5_data tkt, reply;
1293 char *client_user;
1294 u_int len;
1295 int success;
1296
1297 /* use temporary var to avoid size issues on 64bit arch */
1298 tkt.data = buffer_get_string(m, &len);
1299 tkt.length = len;
1300
1301 success = auth_krb5(authctxt, &tkt, &client_user, &reply);
1302
1303 if (tkt.length)
1304 xfree(tkt.data);
1305
1306 buffer_clear(m);
1307 buffer_put_int(m, success);
1308
1309 if (success) {
1310 buffer_put_cstring(m, client_user);
1311 buffer_put_string(m, reply.data, reply.length);
1312 if (client_user)
1313 xfree(client_user);
1314 if (reply.length)
1315 xfree(reply.data);
1316 }
1317 mm_request_send(socket, MONITOR_ANS_KRB5, m);
1318
1319 return success;
1320}
1321#endif
1322
1853d1ef 1323int
1324mm_answer_term(int socket, Buffer *req)
1325{
b5a28cbc 1326 extern struct monitor *pmonitor;
1853d1ef 1327 int res, status;
1328
1588c277 1329 debug3("%s: tearing down sessions", __func__);
1853d1ef 1330
1331 /* The child is terminating */
1332 session_destroy_all(&mm_session_close);
1333
b5a28cbc 1334 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
8c38e88b 1335 if (errno != EINTR)
1336 exit(1);
1853d1ef 1337
1338 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1339
1340 /* Terminate process */
1341 exit (res);
1342}
1343
1344void
b5a28cbc 1345monitor_apply_keystate(struct monitor *pmonitor)
1853d1ef 1346{
1347 if (compat20) {
1348 set_newkeys(MODE_IN);
1349 set_newkeys(MODE_OUT);
1350 } else {
1853d1ef 1351 packet_set_protocol_flags(child_state.ssh1protoflags);
9459414c 1352 packet_set_encryption_key(child_state.ssh1key,
1353 child_state.ssh1keylen, child_state.ssh1cipher);
1354 xfree(child_state.ssh1key);
1853d1ef 1355 }
1356
9459414c 1357 /* for rc4 and other stateful ciphers */
1853d1ef 1358 packet_set_keycontext(MODE_OUT, child_state.keyout);
1359 xfree(child_state.keyout);
1360 packet_set_keycontext(MODE_IN, child_state.keyin);
1361 xfree(child_state.keyin);
1362
1363 if (!compat20) {
1364 packet_set_iv(MODE_OUT, child_state.ivout);
1365 xfree(child_state.ivout);
1366 packet_set_iv(MODE_IN, child_state.ivin);
1367 xfree(child_state.ivin);
1368 }
1369
1370 memcpy(&incoming_stream, &child_state.incoming,
1371 sizeof(incoming_stream));
1372 memcpy(&outgoing_stream, &child_state.outgoing,
1373 sizeof(outgoing_stream));
1374
1375 /* Update with new address */
0496cf34 1376 if (options.compression)
1377 mm_init_compression(pmonitor->m_zlib);
1853d1ef 1378
1379 /* Network I/O buffers */
1380 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1381 buffer_clear(&input);
1382 buffer_append(&input, child_state.input, child_state.ilen);
1383 memset(child_state.input, 0, child_state.ilen);
1384 xfree(child_state.input);
1385
1386 buffer_clear(&output);
1387 buffer_append(&output, child_state.output, child_state.olen);
1388 memset(child_state.output, 0, child_state.olen);
1389 xfree(child_state.output);
1390}
1391
1392static Kex *
1393mm_get_kex(Buffer *m)
1394{
1395 Kex *kex;
1396 void *blob;
1397 u_int bloblen;
1398
1399 kex = xmalloc(sizeof(*kex));
1400 memset(kex, 0, sizeof(*kex));
1401 kex->session_id = buffer_get_string(m, &kex->session_id_len);
521d606b 1402 if ((session_id2 == NULL) ||
1403 (kex->session_id_len != session_id2_len) ||
1404 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1405 fatal("mm_get_get: internal error: bad session id");
1853d1ef 1406 kex->we_need = buffer_get_int(m);
1407 kex->server = 1;
1408 kex->hostkey_type = buffer_get_int(m);
1409 kex->kex_type = buffer_get_int(m);
1410 blob = buffer_get_string(m, &bloblen);
1411 buffer_init(&kex->my);
1412 buffer_append(&kex->my, blob, bloblen);
1413 xfree(blob);
1414 blob = buffer_get_string(m, &bloblen);
1415 buffer_init(&kex->peer);
1416 buffer_append(&kex->peer, blob, bloblen);
1417 xfree(blob);
1418 kex->done = 1;
1419 kex->flags = buffer_get_int(m);
1420 kex->client_version_string = buffer_get_string(m, NULL);
1421 kex->server_version_string = buffer_get_string(m, NULL);
1422 kex->load_host_key=&get_hostkey_by_type;
1423 kex->host_key_index=&get_hostkey_index;
1424
1425 return (kex);
1426}
1427
1428/* This function requries careful sanity checking */
1429
1430void
b5a28cbc 1431mm_get_keystate(struct monitor *pmonitor)
1853d1ef 1432{
1433 Buffer m;
1434 u_char *blob, *p;
1435 u_int bloblen, plen;
1436
1588c277 1437 debug3("%s: Waiting for new keys", __func__);
1853d1ef 1438
1439 buffer_init(&m);
b5a28cbc 1440 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1853d1ef 1441 if (!compat20) {
1442 child_state.ssh1protoflags = buffer_get_int(&m);
1443 child_state.ssh1cipher = buffer_get_int(&m);
9459414c 1444 child_state.ssh1key = buffer_get_string(&m,
1445 &child_state.ssh1keylen);
1853d1ef 1446 child_state.ivout = buffer_get_string(&m,
1447 &child_state.ivoutlen);
1448 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1449 goto skip;
1450 } else {
1451 /* Get the Kex for rekeying */
b5a28cbc 1452 *pmonitor->m_pkex = mm_get_kex(&m);
1853d1ef 1453 }
1454
1455 blob = buffer_get_string(&m, &bloblen);
1456 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1457 xfree(blob);
1458
1588c277 1459 debug3("%s: Waiting for second key", __func__);
1853d1ef 1460 blob = buffer_get_string(&m, &bloblen);
1461 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1462 xfree(blob);
1463
1464 /* Now get sequence numbers for the packets */
1465 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1466 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1467
1468 skip:
1469 /* Get the key context */
1470 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1471 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1472
1588c277 1473 debug3("%s: Getting compression state", __func__);
1853d1ef 1474 /* Get compression state */
1475 p = buffer_get_string(&m, &plen);
1476 if (plen != sizeof(child_state.outgoing))
1588c277 1477 fatal("%s: bad request size", __func__);
1853d1ef 1478 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1479 xfree(p);
1480
1481 p = buffer_get_string(&m, &plen);
1482 if (plen != sizeof(child_state.incoming))
1588c277 1483 fatal("%s: bad request size", __func__);
1853d1ef 1484 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1485 xfree(p);
1486
1487 /* Network I/O buffers */
1588c277 1488 debug3("%s: Getting Network I/O buffers", __func__);
1853d1ef 1489 child_state.input = buffer_get_string(&m, &child_state.ilen);
1490 child_state.output = buffer_get_string(&m, &child_state.olen);
1491
1492 buffer_free(&m);
1493}
1494
1495
1496/* Allocation functions for zlib */
1497void *
1498mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1499{
b85698ab 1500 size_t len = size * ncount;
1853d1ef 1501 void *address;
1502
b85698ab 1503 if (len == 0 || ncount > SIZE_T_MAX / size)
2f095a0e 1504 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1505
1506 address = mm_malloc(mm, len);
1853d1ef 1507
1508 return (address);
1509}
1510
1511void
1512mm_zfree(struct mm_master *mm, void *address)
1513{
1514 mm_free(mm, address);
1515}
1516
1517void
1518mm_init_compression(struct mm_master *mm)
1519{
1520 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1521 outgoing_stream.zfree = (free_func)mm_zfree;
1522 outgoing_stream.opaque = mm;
1523
1524 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1525 incoming_stream.zfree = (free_func)mm_zfree;
1526 incoming_stream.opaque = mm;
1527}
1528
1529/* XXX */
1530
1531#define FD_CLOSEONEXEC(x) do { \
1532 if (fcntl(x, F_SETFD, 1) == -1) \
1533 fatal("fcntl(%d, F_SETFD)", x); \
1534} while (0)
1535
1536static void
1537monitor_socketpair(int *pair)
1538{
f1af2dbf 1539#ifdef HAVE_SOCKETPAIR
1853d1ef 1540 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1588c277 1541 fatal("%s: socketpair", __func__);
f1af2dbf 1542#else
1543 fatal("%s: UsePrivilegeSeparation=yes not supported",
1588c277 1544 __func__);
f1af2dbf 1545#endif
1853d1ef 1546 FD_CLOSEONEXEC(pair[0]);
1547 FD_CLOSEONEXEC(pair[1]);
1548}
1549
1550#define MM_MEMSIZE 65536
1551
1552struct monitor *
1553monitor_init(void)
1554{
1555 struct monitor *mon;
1556 int pair[2];
1557
1558 mon = xmalloc(sizeof(*mon));
1559
1560 monitor_socketpair(pair);
1561
1562 mon->m_recvfd = pair[0];
1563 mon->m_sendfd = pair[1];
1564
1565 /* Used to share zlib space across processes */
0496cf34 1566 if (options.compression) {
1567 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1568 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1853d1ef 1569
0496cf34 1570 /* Compression needs to share state across borders */
1571 mm_init_compression(mon->m_zlib);
1572 }
1853d1ef 1573
1574 return mon;
1575}
1576
1577void
1578monitor_reinit(struct monitor *mon)
1579{
1580 int pair[2];
1581
1582 monitor_socketpair(pair);
1583
1584 mon->m_recvfd = pair[0];
1585 mon->m_sendfd = pair[1];
1586}
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