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2980ea68 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"
ff2d7a98 28RCSID("$OpenBSD: monitor.c,v 1.18 2002/06/26 13:20:57 deraadt Exp $");
2980ea68 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
ff2d7a98 62#ifdef GSSAPI
63#include "ssh-gss.h"
64static Gssctxt *gsscontext = NULL;
65#endif
66
2980ea68 67/* Imports */
68extern ServerOptions options;
69extern u_int utmp_len;
70extern Newkeys *current_keys[];
71extern z_stream incoming_stream;
72extern z_stream outgoing_stream;
73extern u_char session_id[];
74extern Buffer input, output;
75extern Buffer auth_debug;
76extern int auth_debug_init;
77
78/* State exported from the child */
79
80struct {
81 z_stream incoming;
82 z_stream outgoing;
83 u_char *keyin;
84 u_int keyinlen;
85 u_char *keyout;
86 u_int keyoutlen;
87 u_char *ivin;
88 u_int ivinlen;
89 u_char *ivout;
90 u_int ivoutlen;
ff2d7a98 91 u_char *ssh1key;
92 u_int ssh1keylen;
2980ea68 93 int ssh1cipher;
94 int ssh1protoflags;
95 u_char *input;
96 u_int ilen;
97 u_char *output;
98 u_int olen;
99} child_state;
100
101/* Functions on the montior that answer unprivileged requests */
102
103int mm_answer_moduli(int, Buffer *);
104int mm_answer_sign(int, Buffer *);
105int mm_answer_pwnamallow(int, Buffer *);
106int mm_answer_auth2_read_banner(int, Buffer *);
107int mm_answer_authserv(int, Buffer *);
108int mm_answer_authpassword(int, Buffer *);
109int mm_answer_bsdauthquery(int, Buffer *);
110int mm_answer_bsdauthrespond(int, Buffer *);
111int mm_answer_skeyquery(int, Buffer *);
112int mm_answer_skeyrespond(int, Buffer *);
113int mm_answer_keyallowed(int, Buffer *);
114int mm_answer_keyverify(int, Buffer *);
115int mm_answer_pty(int, Buffer *);
116int mm_answer_pty_cleanup(int, Buffer *);
117int mm_answer_term(int, Buffer *);
118int mm_answer_rsa_keyallowed(int, Buffer *);
119int mm_answer_rsa_challenge(int, Buffer *);
120int mm_answer_rsa_response(int, Buffer *);
121int mm_answer_sesskey(int, Buffer *);
122int mm_answer_sessid(int, Buffer *);
123
124#ifdef USE_PAM
125int mm_answer_pam_start(int, Buffer *);
126#endif
127
ff2d7a98 128#ifdef GSSAPI
129int mm_answer_gss_setup_ctx(int, Buffer *);
130int mm_answer_gss_accept_ctx(int, Buffer *);
131int mm_answer_gss_userok(int, Buffer *);
132int mm_answer_gss_localname(int, Buffer *);
133int mm_answer_gss_sign(int, Buffer *);
98f19977 134int mm_answer_gss_indicate_mechs(int, Buffer *);
135int mm_answer_gss_display_status(int, Buffer *);
ff2d7a98 136#endif
137
138#ifdef GSI
139int mm_answer_gsi_gridmap(int, Buffer *);
140#endif
141
2980ea68 142static Authctxt *authctxt;
143static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
144
145/* local state for key verify */
146static u_char *key_blob = NULL;
147static u_int key_bloblen = 0;
148static int key_blobtype = MM_NOKEY;
149static u_char *hostbased_cuser = NULL;
150static u_char *hostbased_chost = NULL;
151static char *auth_method = "unknown";
ff2d7a98 152static int session_id2_len = 0;
153static u_char *session_id2 = NULL;
2980ea68 154
155struct mon_table {
156 enum monitor_reqtype type;
157 int flags;
158 int (*f)(int, Buffer *);
159};
160
161#define MON_ISAUTH 0x0004 /* Required for Authentication */
162#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
163#define MON_ONCE 0x0010 /* Disable after calling */
164
165#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
166
167#define MON_PERMIT 0x1000 /* Request is permitted */
168
169struct mon_table mon_dispatch_proto20[] = {
170 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
171 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
ff2d7a98 172 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
2980ea68 173 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
174 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
175 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
176#ifdef USE_PAM
ff2d7a98 177 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
2980ea68 178#endif
179#ifdef BSD_AUTH
180 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
181 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
182#endif
183#ifdef SKEY
184 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
185 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
ff2d7a98 186#endif
187#ifdef GSSAPI
188 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
189 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
190 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
98f19977 191 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
192 {MONITOR_REQ_GSSSTAT, MON_ISAUTH, mm_answer_gss_display_status},
ff2d7a98 193 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
194 {MONITOR_REQ_GSSLOCALNAME, MON_AUTH, mm_answer_gss_localname},
2980ea68 195#endif
196 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
197 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
198 {0, 0, NULL}
199};
200
201struct mon_table mon_dispatch_postauth20[] = {
ff2d7a98 202#ifdef GSSAPI
203 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
204 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
205 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
98f19977 206 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
207 {MONITOR_REQ_GSSSTAT, 0, mm_answer_gss_display_status},
ff2d7a98 208#endif
2980ea68 209 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
210 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
211 {MONITOR_REQ_PTY, 0, mm_answer_pty},
212 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
213 {MONITOR_REQ_TERM, 0, mm_answer_term},
214 {0, 0, NULL}
215};
216
217struct mon_table mon_dispatch_proto15[] = {
218 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
219 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
220 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
221 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
222 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
223 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
224 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
225 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
2980ea68 226#ifdef BSD_AUTH
227 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
228 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
229#endif
230#ifdef SKEY
231 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
232 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
233#endif
ff2d7a98 234#ifdef GSSAPI
235 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
236 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
237 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
238 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
98f19977 239 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
240 {MONITOR_REQ_GSSSTAT, MON_ISAUTH, mm_answer_gss_display_status},
ff2d7a98 241#endif
242#ifdef GSI
243 {MONITOR_REQ_GSIGRIDMAP, MON_PERMIT, mm_answer_gsi_gridmap},
244#endif
2980ea68 245#ifdef USE_PAM
ff2d7a98 246 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
2980ea68 247#endif
248 {0, 0, NULL}
249};
250
251struct mon_table mon_dispatch_postauth15[] = {
ff2d7a98 252#ifdef GSSAPI
253 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
254 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
255 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
98f19977 256 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
257 {MONITOR_REQ_GSSSTAT, 0, mm_answer_gss_display_status},
ff2d7a98 258#endif
2980ea68 259 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
260 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
261 {MONITOR_REQ_TERM, 0, mm_answer_term},
262 {0, 0, NULL}
263};
264
265struct mon_table *mon_dispatch;
266
267/* Specifies if a certain message is allowed at the moment */
268
269static void
270monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
271{
272 while (ent->f != NULL) {
273 if (ent->type == type) {
274 ent->flags &= ~MON_PERMIT;
275 ent->flags |= permit ? MON_PERMIT : 0;
276 return;
277 }
278 ent++;
279 }
280}
281
282static void
283monitor_permit_authentications(int permit)
284{
285 struct mon_table *ent = mon_dispatch;
286
287 while (ent->f != NULL) {
288 if (ent->flags & MON_AUTH) {
289 ent->flags &= ~MON_PERMIT;
290 ent->flags |= permit ? MON_PERMIT : 0;
291 }
292 ent++;
293 }
294}
295
296Authctxt *
297monitor_child_preauth(struct monitor *pmonitor)
298{
299 struct mon_table *ent;
300 int authenticated = 0;
301
302 debug3("preauth child monitor started");
303
304 if (compat20) {
305 mon_dispatch = mon_dispatch_proto20;
306
307 /* Permit requests for moduli and signatures */
308 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
309 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
ff2d7a98 310#ifdef GSSAPI
311 /* and for the GSSAPI key exchange */
312 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
313 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
314 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
98f19977 315 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
316 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTAT, 1);
ff2d7a98 317#endif
2980ea68 318 } else {
319 mon_dispatch = mon_dispatch_proto15;
320
321 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
ff2d7a98 322#ifdef GSSAPI
323 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
98f19977 324 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
325 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTAT, 1);
ff2d7a98 326#endif
327#ifdef GSI
328 monitor_permit(mon_dispatch, MONITOR_REQ_GSIGRIDMAP, 1);
329#endif
2980ea68 330 }
331
332 authctxt = authctxt_new();
333
334 /* The first few requests do not require asynchronous access */
335 while (!authenticated) {
336 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
337 if (authenticated) {
338 if (!(ent->flags & MON_AUTHDECIDE))
339 fatal("%s: unexpected authentication from %d",
ff2d7a98 340 __func__, ent->type);
2980ea68 341 if (authctxt->pw->pw_uid == 0 &&
342 !auth_root_allowed(auth_method))
343 authenticated = 0;
344#ifdef USE_PAM
345 if (!do_pam_account(authctxt->pw->pw_name, NULL))
346 authenticated = 0;
347#endif
348 }
349
350 if (ent->flags & MON_AUTHDECIDE) {
351 auth_log(authctxt, authenticated, auth_method,
352 compat20 ? " ssh2" : "");
353 if (!authenticated)
354 authctxt->failures++;
355 }
356 }
357
358 if (!authctxt->valid)
ff2d7a98 359 fatal("%s: authenticated invalid user", __func__);
2980ea68 360
361 debug("%s: %s has been authenticated by privileged process",
ff2d7a98 362 __func__, authctxt->user);
2980ea68 363
364 mm_get_keystate(pmonitor);
365
366 return (authctxt);
367}
368
369void
370monitor_child_postauth(struct monitor *pmonitor)
371{
372 if (compat20) {
373 mon_dispatch = mon_dispatch_postauth20;
374
375 /* Permit requests for moduli and signatures */
376 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
377 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
378 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
379
380 } else {
381 mon_dispatch = mon_dispatch_postauth15;
382 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
383 }
98f19977 384#ifdef GSSAPI
385 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTAT, 1);
386#endif
2980ea68 387 if (!no_pty_flag) {
388 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
389 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
390 }
391
392 for (;;)
393 monitor_read(pmonitor, mon_dispatch, NULL);
394}
395
396void
397monitor_sync(struct monitor *pmonitor)
398{
ff2d7a98 399 if (options.compression) {
400 /* The member allocation is not visible, so sync it */
401 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
402 }
2980ea68 403}
404
405int
406monitor_read(struct monitor *pmonitor, struct mon_table *ent,
407 struct mon_table **pent)
408{
409 Buffer m;
410 int ret;
411 u_char type;
412
413 buffer_init(&m);
414
415 mm_request_receive(pmonitor->m_sendfd, &m);
416 type = buffer_get_char(&m);
417
ff2d7a98 418 debug3("%s: checking request %d", __func__, type);
2980ea68 419
420 while (ent->f != NULL) {
421 if (ent->type == type)
422 break;
423 ent++;
424 }
425
426 if (ent->f != NULL) {
427 if (!(ent->flags & MON_PERMIT))
ff2d7a98 428 fatal("%s: unpermitted request %d", __func__,
2980ea68 429 type);
430 ret = (*ent->f)(pmonitor->m_sendfd, &m);
431 buffer_free(&m);
432
433 /* The child may use this request only once, disable it */
434 if (ent->flags & MON_ONCE) {
ff2d7a98 435 debug2("%s: %d used once, disabling now", __func__,
2980ea68 436 type);
437 ent->flags &= ~MON_PERMIT;
438 }
439
440 if (pent != NULL)
441 *pent = ent;
442
443 return ret;
444 }
445
ff2d7a98 446 fatal("%s: unsupported request: %d", __func__, type);
2980ea68 447
448 /* NOTREACHED */
449 return (-1);
450}
451
452/* allowed key state */
453static int
454monitor_allowed_key(u_char *blob, u_int bloblen)
455{
456 /* make sure key is allowed */
457 if (key_blob == NULL || key_bloblen != bloblen ||
458 memcmp(key_blob, blob, key_bloblen))
459 return (0);
460 return (1);
461}
462
463static void
464monitor_reset_key_state(void)
465{
466 /* reset state */
467 if (key_blob != NULL)
468 xfree(key_blob);
469 if (hostbased_cuser != NULL)
470 xfree(hostbased_cuser);
471 if (hostbased_chost != NULL)
472 xfree(hostbased_chost);
473 key_blob = NULL;
474 key_bloblen = 0;
475 key_blobtype = MM_NOKEY;
476 hostbased_cuser = NULL;
477 hostbased_chost = NULL;
478}
479
480int
481mm_answer_moduli(int socket, Buffer *m)
482{
483 DH *dh;
484 int min, want, max;
485
486 min = buffer_get_int(m);
487 want = buffer_get_int(m);
488 max = buffer_get_int(m);
489
490 debug3("%s: got parameters: %d %d %d",
ff2d7a98 491 __func__, min, want, max);
2980ea68 492 /* We need to check here, too, in case the child got corrupted */
493 if (max < min || want < min || max < want)
494 fatal("%s: bad parameters: %d %d %d",
ff2d7a98 495 __func__, min, want, max);
2980ea68 496
497 buffer_clear(m);
498
499 dh = choose_dh(min, want, max);
500 if (dh == NULL) {
501 buffer_put_char(m, 0);
502 return (0);
503 } else {
504 /* Send first bignum */
505 buffer_put_char(m, 1);
506 buffer_put_bignum2(m, dh->p);
507 buffer_put_bignum2(m, dh->g);
508
509 DH_free(dh);
510 }
511 mm_request_send(socket, MONITOR_ANS_MODULI, m);
512 return (0);
513}
514
515int
516mm_answer_sign(int socket, Buffer *m)
517{
518 Key *key;
519 u_char *p;
520 u_char *signature;
521 u_int siglen, datlen;
522 int keyid;
523
ff2d7a98 524 debug3("%s", __func__);
2980ea68 525
526 keyid = buffer_get_int(m);
527 p = buffer_get_string(m, &datlen);
528
529 if (datlen != 20)
ff2d7a98 530 fatal("%s: data length incorrect: %d", __func__, datlen);
531
532 /* save session id, it will be passed on the first call */
533 if (session_id2_len == 0) {
534 session_id2_len = datlen;
535 session_id2 = xmalloc(session_id2_len);
536 memcpy(session_id2, p, session_id2_len);
537 }
2980ea68 538
539 if ((key = get_hostkey_by_index(keyid)) == NULL)
ff2d7a98 540 fatal("%s: no hostkey from index %d", __func__, keyid);
2980ea68 541 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
ff2d7a98 542 fatal("%s: key_sign failed", __func__);
2980ea68 543
ff2d7a98 544 debug3("%s: signature %p(%d)", __func__, signature, siglen);
2980ea68 545
546 buffer_clear(m);
547 buffer_put_string(m, signature, siglen);
548
549 xfree(p);
550 xfree(signature);
551
552 mm_request_send(socket, MONITOR_ANS_SIGN, m);
553
554 /* Turn on permissions for getpwnam */
555 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
556
557 return (0);
558}
559
560/* Retrieves the password entry and also checks if the user is permitted */
561
562int
563mm_answer_pwnamallow(int socket, Buffer *m)
564{
565 char *login;
566 struct passwd *pwent;
567 int allowed = 0;
568
ff2d7a98 569 debug3("%s", __func__);
2980ea68 570
571 login = buffer_get_string(m, NULL);
572
573 pwent = getpwnamallow(login);
574
ff2d7a98 575 if (authctxt->user) xfree(authctxt->user);
2980ea68 576 authctxt->user = xstrdup(login);
577 setproctitle("%s [priv]", pwent ? login : "unknown");
578 xfree(login);
579
580 buffer_clear(m);
581
582 if (pwent == NULL) {
583 buffer_put_char(m, 0);
584 goto out;
585 }
586
587 allowed = 1;
588 authctxt->pw = pwent;
589 authctxt->valid = 1;
590
591 buffer_put_char(m, 1);
592 buffer_put_string(m, pwent, sizeof(struct passwd));
593 buffer_put_cstring(m, pwent->pw_name);
594 buffer_put_cstring(m, "*");
595 buffer_put_cstring(m, pwent->pw_gecos);
596#ifdef HAVE_PW_CLASS_IN_PASSWD
597 buffer_put_cstring(m, pwent->pw_class);
598#endif
599 buffer_put_cstring(m, pwent->pw_dir);
600 buffer_put_cstring(m, pwent->pw_shell);
601
602 out:
ff2d7a98 603 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
2980ea68 604 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
605
606 /* For SSHv1 allow authentication now */
607 if (!compat20)
608 monitor_permit_authentications(1);
609 else {
610 /* Allow service/style information on the auth context */
611 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
612 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
613 }
614
615#ifdef USE_PAM
616 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
617#endif
618
619 return (0);
620}
621
622int mm_answer_auth2_read_banner(int socket, Buffer *m)
623{
624 char *banner;
625
626 buffer_clear(m);
627 banner = auth2_read_banner();
628 buffer_put_cstring(m, banner != NULL ? banner : "");
629 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
630
631 if (banner != NULL)
632 free(banner);
633
634 return (0);
635}
636
637int
638mm_answer_authserv(int socket, Buffer *m)
639{
640 monitor_permit_authentications(1);
641
642 authctxt->service = buffer_get_string(m, NULL);
643 authctxt->style = buffer_get_string(m, NULL);
644 debug3("%s: service=%s, style=%s",
ff2d7a98 645 __func__, authctxt->service, authctxt->style);
2980ea68 646
647 if (strlen(authctxt->style) == 0) {
648 xfree(authctxt->style);
649 authctxt->style = NULL;
650 }
651
652 return (0);
653}
654
655int
656mm_answer_authpassword(int socket, Buffer *m)
657{
658 static int call_count;
659 char *passwd;
660 int authenticated, plen;
661
662 passwd = buffer_get_string(m, &plen);
663 /* Only authenticate if the context is valid */
ff2d7a98 664 authenticated = options.password_authentication &&
665 authctxt->valid && auth_password(authctxt, passwd);
2980ea68 666 memset(passwd, 0, strlen(passwd));
667 xfree(passwd);
668
669 buffer_clear(m);
670 buffer_put_int(m, authenticated);
671
ff2d7a98 672 debug3("%s: sending result %d", __func__, authenticated);
2980ea68 673 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
674
675 call_count++;
676 if (plen == 0 && call_count == 1)
677 auth_method = "none";
678 else
679 auth_method = "password";
680
681 /* Causes monitor loop to terminate if authenticated */
682 return (authenticated);
683}
684
685#ifdef BSD_AUTH
686int
687mm_answer_bsdauthquery(int socket, Buffer *m)
688{
689 char *name, *infotxt;
690 u_int numprompts;
691 u_int *echo_on;
692 char **prompts;
693 int res;
694
695 res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
696 &prompts, &echo_on);
697
698 buffer_clear(m);
699 buffer_put_int(m, res);
700 if (res != -1)
701 buffer_put_cstring(m, prompts[0]);
702
ff2d7a98 703 debug3("%s: sending challenge res: %d", __func__, res);
2980ea68 704 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
705
706 if (res != -1) {
707 xfree(name);
708 xfree(infotxt);
709 xfree(prompts);
710 xfree(echo_on);
711 }
712
713 return (0);
714}
715
716int
717mm_answer_bsdauthrespond(int socket, Buffer *m)
718{
719 char *response;
720 int authok;
721
722 if (authctxt->as == 0)
ff2d7a98 723 fatal("%s: no bsd auth session", __func__);
2980ea68 724
725 response = buffer_get_string(m, NULL);
ff2d7a98 726 authok = options.challenge_response_authentication &&
727 auth_userresponse(authctxt->as, response, 0);
2980ea68 728 authctxt->as = NULL;
ff2d7a98 729 debug3("%s: <%s> = <%d>", __func__, response, authok);
2980ea68 730 xfree(response);
731
732 buffer_clear(m);
733 buffer_put_int(m, authok);
734
ff2d7a98 735 debug3("%s: sending authenticated: %d", __func__, authok);
2980ea68 736 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
737
738 auth_method = "bsdauth";
739
740 return (authok != 0);
741}
742#endif
743
744#ifdef SKEY
745int
746mm_answer_skeyquery(int socket, Buffer *m)
747{
748 struct skey skey;
749 char challenge[1024];
750 int res;
751
752 res = skeychallenge(&skey, authctxt->user, challenge);
753
754 buffer_clear(m);
755 buffer_put_int(m, res);
756 if (res != -1)
757 buffer_put_cstring(m, challenge);
758
ff2d7a98 759 debug3("%s: sending challenge res: %d", __func__, res);
2980ea68 760 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
761
762 return (0);
763}
764
765int
766mm_answer_skeyrespond(int socket, Buffer *m)
767{
768 char *response;
769 int authok;
770
771 response = buffer_get_string(m, NULL);
772
ff2d7a98 773 authok = (options.challenge_response_authentication &&
774 authctxt->valid &&
2980ea68 775 skey_haskey(authctxt->pw->pw_name) == 0 &&
776 skey_passcheck(authctxt->pw->pw_name, response) != -1);
777
778 xfree(response);
779
780 buffer_clear(m);
781 buffer_put_int(m, authok);
782
ff2d7a98 783 debug3("%s: sending authenticated: %d", __func__, authok);
2980ea68 784 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
785
786 auth_method = "skey";
787
788 return (authok != 0);
789}
790#endif
791
792#ifdef USE_PAM
793int
794mm_answer_pam_start(int socket, Buffer *m)
795{
796 char *user;
797
798 user = buffer_get_string(m, NULL);
799
800 start_pam(user);
801
802 xfree(user);
803
804 return (0);
805}
806#endif
807
808static void
809mm_append_debug(Buffer *m)
810{
811 if (auth_debug_init && buffer_len(&auth_debug)) {
ff2d7a98 812 debug3("%s: Appending debug messages for child", __func__);
2980ea68 813 buffer_append(m, buffer_ptr(&auth_debug),
814 buffer_len(&auth_debug));
815 buffer_clear(&auth_debug);
816 }
817}
818
819int
820mm_answer_keyallowed(int socket, Buffer *m)
821{
822 Key *key;
823 u_char *cuser, *chost, *blob;
824 u_int bloblen;
825 enum mm_keytype type = 0;
826 int allowed = 0;
827
ff2d7a98 828 debug3("%s entering", __func__);
2980ea68 829
830 type = buffer_get_int(m);
831 cuser = buffer_get_string(m, NULL);
832 chost = buffer_get_string(m, NULL);
833 blob = buffer_get_string(m, &bloblen);
834
835 key = key_from_blob(blob, bloblen);
836
837 if ((compat20 && type == MM_RSAHOSTKEY) ||
838 (!compat20 && type != MM_RSAHOSTKEY))
ff2d7a98 839 fatal("%s: key type and protocol mismatch", __func__);
2980ea68 840
ff2d7a98 841 debug3("%s: key_from_blob: %p", __func__, key);
2980ea68 842
843 if (key != NULL && authctxt->pw != NULL) {
844 switch(type) {
845 case MM_USERKEY:
ff2d7a98 846 allowed = options.pubkey_authentication &&
847 user_key_allowed(authctxt->pw, key);
2980ea68 848 break;
849 case MM_HOSTKEY:
ff2d7a98 850 allowed = options.hostbased_authentication &&
851 hostbased_key_allowed(authctxt->pw,
2980ea68 852 cuser, chost, key);
853 break;
854 case MM_RSAHOSTKEY:
855 key->type = KEY_RSA1; /* XXX */
ff2d7a98 856 allowed = options.rhosts_rsa_authentication &&
857 auth_rhosts_rsa_key_allowed(authctxt->pw,
2980ea68 858 cuser, chost, key);
859 break;
860 default:
ff2d7a98 861 fatal("%s: unknown key type %d", __func__, type);
2980ea68 862 break;
863 }
864 key_free(key);
865 }
866
867 /* clear temporarily storage (used by verify) */
868 monitor_reset_key_state();
869
870 if (allowed) {
871 /* Save temporarily for comparison in verify */
872 key_blob = blob;
873 key_bloblen = bloblen;
874 key_blobtype = type;
875 hostbased_cuser = cuser;
876 hostbased_chost = chost;
877 }
878
879 debug3("%s: key %p is %s",
ff2d7a98 880 __func__, key, allowed ? "allowed" : "disallowed");
2980ea68 881
882 buffer_clear(m);
883 buffer_put_int(m, allowed);
884
885 mm_append_debug(m);
886
887 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
888
889 if (type == MM_RSAHOSTKEY)
890 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
891
892 return (0);
893}
894
895static int
896monitor_valid_userblob(u_char *data, u_int datalen)
897{
898 Buffer b;
899 u_char *p;
900 u_int len;
901 int fail = 0;
2980ea68 902
903 buffer_init(&b);
904 buffer_append(&b, data, datalen);
905
906 if (datafellows & SSH_OLD_SESSIONID) {
ff2d7a98 907 p = buffer_ptr(&b);
908 len = buffer_len(&b);
909 if ((session_id2 == NULL) ||
910 (len < session_id2_len) ||
911 (memcmp(p, session_id2, session_id2_len) != 0))
912 fail++;
2980ea68 913 buffer_consume(&b, session_id2_len);
914 } else {
ff2d7a98 915 p = buffer_get_string(&b, &len);
916 if ((session_id2 == NULL) ||
917 (len != session_id2_len) ||
918 (memcmp(p, session_id2, session_id2_len) != 0))
2980ea68 919 fail++;
ff2d7a98 920 xfree(p);
2980ea68 921 }
922 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
923 fail++;
924 p = buffer_get_string(&b, NULL);
925 if (strcmp(authctxt->user, p) != 0) {
926 log("wrong user name passed to monitor: expected %s != %.100s",
927 authctxt->user, p);
928 fail++;
929 }
930 xfree(p);
931 buffer_skip_string(&b);
932 if (datafellows & SSH_BUG_PKAUTH) {
933 if (!buffer_get_char(&b))
934 fail++;
935 } else {
936 p = buffer_get_string(&b, NULL);
937 if (strcmp("publickey", p) != 0)
938 fail++;
939 xfree(p);
940 if (!buffer_get_char(&b))
941 fail++;
942 buffer_skip_string(&b);
943 }
944 buffer_skip_string(&b);
945 if (buffer_len(&b) != 0)
946 fail++;
947 buffer_free(&b);
948 return (fail == 0);
949}
950
951static int
952monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
953 u_char *chost)
954{
955 Buffer b;
956 u_char *p;
957 u_int len;
958 int fail = 0;
2980ea68 959
960 buffer_init(&b);
961 buffer_append(&b, data, datalen);
962
ff2d7a98 963 p = buffer_get_string(&b, &len);
964 if ((session_id2 == NULL) ||
965 (len != session_id2_len) ||
966 (memcmp(p, session_id2, session_id2_len) != 0))
2980ea68 967 fail++;
ff2d7a98 968 xfree(p);
969
2980ea68 970 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
971 fail++;
972 p = buffer_get_string(&b, NULL);
973 if (strcmp(authctxt->user, p) != 0) {
974 log("wrong user name passed to monitor: expected %s != %.100s",
975 authctxt->user, p);
976 fail++;
977 }
978 xfree(p);
979 buffer_skip_string(&b); /* service */
980 p = buffer_get_string(&b, NULL);
981 if (strcmp(p, "hostbased") != 0)
982 fail++;
983 xfree(p);
984 buffer_skip_string(&b); /* pkalg */
985 buffer_skip_string(&b); /* pkblob */
986
987 /* verify client host, strip trailing dot if necessary */
988 p = buffer_get_string(&b, NULL);
989 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
990 p[len - 1] = '\0';
991 if (strcmp(p, chost) != 0)
992 fail++;
993 xfree(p);
994
995 /* verify client user */
996 p = buffer_get_string(&b, NULL);
997 if (strcmp(p, cuser) != 0)
998 fail++;
999 xfree(p);
1000
1001 if (buffer_len(&b) != 0)
1002 fail++;
1003 buffer_free(&b);
1004 return (fail == 0);
1005}
1006
1007int
1008mm_answer_keyverify(int socket, Buffer *m)
1009{
1010 Key *key;
1011 u_char *signature, *data, *blob;
1012 u_int signaturelen, datalen, bloblen;
1013 int verified = 0;
1014 int valid_data = 0;
1015
1016 blob = buffer_get_string(m, &bloblen);
1017 signature = buffer_get_string(m, &signaturelen);
1018 data = buffer_get_string(m, &datalen);
1019
1020 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1021 !monitor_allowed_key(blob, bloblen))
ff2d7a98 1022 fatal("%s: bad key, not previously allowed", __func__);
2980ea68 1023
1024 key = key_from_blob(blob, bloblen);
1025 if (key == NULL)
ff2d7a98 1026 fatal("%s: bad public key blob", __func__);
2980ea68 1027
1028 switch (key_blobtype) {
1029 case MM_USERKEY:
1030 valid_data = monitor_valid_userblob(data, datalen);
1031 break;
1032 case MM_HOSTKEY:
1033 valid_data = monitor_valid_hostbasedblob(data, datalen,
1034 hostbased_cuser, hostbased_chost);
1035 break;
1036 default:
1037 valid_data = 0;
1038 break;
1039 }
1040 if (!valid_data)
ff2d7a98 1041 fatal("%s: bad signature data blob", __func__);
2980ea68 1042
1043 verified = key_verify(key, signature, signaturelen, data, datalen);
1044 debug3("%s: key %p signature %s",
ff2d7a98 1045 __func__, key, verified ? "verified" : "unverified");
2980ea68 1046
1047 key_free(key);
1048 xfree(blob);
1049 xfree(signature);
1050 xfree(data);
1051
ff2d7a98 1052 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1053
2980ea68 1054 monitor_reset_key_state();
1055
1056 buffer_clear(m);
1057 buffer_put_int(m, verified);
1058 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1059
2980ea68 1060 return (verified);
1061}
1062
1063static void
1064mm_record_login(Session *s, struct passwd *pw)
1065{
1066 socklen_t fromlen;
1067 struct sockaddr_storage from;
1068
1069 /*
1070 * Get IP address of client. If the connection is not a socket, let
1071 * the address be 0.0.0.0.
1072 */
1073 memset(&from, 0, sizeof(from));
1074 if (packet_connection_is_on_socket()) {
1075 fromlen = sizeof(from);
1076 if (getpeername(packet_get_connection_in(),
1077 (struct sockaddr *) & from, &fromlen) < 0) {
1078 debug("getpeername: %.100s", strerror(errno));
1079 fatal_cleanup();
1080 }
1081 }
1082 /* Record that there was a login on that tty from the remote host. */
1083 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1084 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
1085 (struct sockaddr *)&from);
1086}
1087
1088static void
1089mm_session_close(Session *s)
1090{
ff2d7a98 1091 debug3("%s: session %d pid %d", __func__, s->self, s->pid);
2980ea68 1092 if (s->ttyfd != -1) {
ff2d7a98 1093 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
2980ea68 1094 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
1095 session_pty_cleanup2(s);
1096 }
1097 s->used = 0;
1098}
1099
1100int
1101mm_answer_pty(int socket, Buffer *m)
1102{
1103 extern struct monitor *pmonitor;
1104 Session *s;
1105 int res, fd0;
1106
ff2d7a98 1107 debug3("%s entering", __func__);
2980ea68 1108
1109 buffer_clear(m);
1110 s = session_new();
1111 if (s == NULL)
1112 goto error;
1113 s->authctxt = authctxt;
1114 s->pw = authctxt->pw;
1115 s->pid = pmonitor->m_pid;
1116 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1117 if (res == 0)
1118 goto error;
1119 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1120 pty_setowner(authctxt->pw, s->tty);
1121
1122 buffer_put_int(m, 1);
1123 buffer_put_cstring(m, s->tty);
1124 mm_request_send(socket, MONITOR_ANS_PTY, m);
1125
1126 mm_send_fd(socket, s->ptyfd);
1127 mm_send_fd(socket, s->ttyfd);
1128
1129 /* We need to trick ttyslot */
1130 if (dup2(s->ttyfd, 0) == -1)
ff2d7a98 1131 fatal("%s: dup2", __func__);
2980ea68 1132
1133 mm_record_login(s, authctxt->pw);
1134
1135 /* Now we can close the file descriptor again */
1136 close(0);
1137
1138 /* make sure nothing uses fd 0 */
1139 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
ff2d7a98 1140 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
2980ea68 1141 if (fd0 != 0)
ff2d7a98 1142 error("%s: fd0 %d != 0", __func__, fd0);
2980ea68 1143
1144 /* slave is not needed */
1145 close(s->ttyfd);
1146 s->ttyfd = s->ptyfd;
1147 /* no need to dup() because nobody closes ptyfd */
1148 s->ptymaster = s->ptyfd;
1149
ff2d7a98 1150 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
2980ea68 1151
1152 return (0);
1153
1154 error:
1155 if (s != NULL)
1156 mm_session_close(s);
1157 buffer_put_int(m, 0);
1158 mm_request_send(socket, MONITOR_ANS_PTY, m);
1159 return (0);
1160}
1161
1162int
1163mm_answer_pty_cleanup(int socket, Buffer *m)
1164{
1165 Session *s;
1166 char *tty;
1167
ff2d7a98 1168 debug3("%s entering", __func__);
2980ea68 1169
1170 tty = buffer_get_string(m, NULL);
1171 if ((s = session_by_tty(tty)) != NULL)
1172 mm_session_close(s);
1173 buffer_clear(m);
1174 xfree(tty);
1175 return (0);
1176}
1177
1178int
1179mm_answer_sesskey(int socket, Buffer *m)
1180{
1181 BIGNUM *p;
1182 int rsafail;
1183
1184 /* Turn off permissions */
1185 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1186
1187 if ((p = BN_new()) == NULL)
ff2d7a98 1188 fatal("%s: BN_new", __func__);
2980ea68 1189
1190 buffer_get_bignum2(m, p);
1191
1192 rsafail = ssh1_session_key(p);
1193
1194 buffer_clear(m);
1195 buffer_put_int(m, rsafail);
1196 buffer_put_bignum2(m, p);
1197
1198 BN_clear_free(p);
1199
1200 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1201
1202 /* Turn on permissions for sessid passing */
1203 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1204
1205 return (0);
1206}
1207
1208int
1209mm_answer_sessid(int socket, Buffer *m)
1210{
1211 int i;
1212
ff2d7a98 1213 debug3("%s entering", __func__);
2980ea68 1214
1215 if (buffer_len(m) != 16)
ff2d7a98 1216 fatal("%s: bad ssh1 session id", __func__);
2980ea68 1217 for (i = 0; i < 16; i++)
1218 session_id[i] = buffer_get_char(m);
1219
1220 /* Turn on permissions for getpwnam */
1221 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1222
1223 return (0);
1224}
1225
1226int
1227mm_answer_rsa_keyallowed(int socket, Buffer *m)
1228{
1229 BIGNUM *client_n;
1230 Key *key = NULL;
1231 u_char *blob = NULL;
1232 u_int blen = 0;
1233 int allowed = 0;
1234
ff2d7a98 1235 debug3("%s entering", __func__);
2980ea68 1236
ff2d7a98 1237 if (options.rsa_authentication && authctxt->valid) {
2980ea68 1238 if ((client_n = BN_new()) == NULL)
ff2d7a98 1239 fatal("%s: BN_new", __func__);
2980ea68 1240 buffer_get_bignum2(m, client_n);
1241 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1242 BN_clear_free(client_n);
1243 }
1244 buffer_clear(m);
1245 buffer_put_int(m, allowed);
1246
1247 /* clear temporarily storage (used by generate challenge) */
1248 monitor_reset_key_state();
1249
1250 if (allowed && key != NULL) {
1251 key->type = KEY_RSA; /* cheat for key_to_blob */
1252 if (key_to_blob(key, &blob, &blen) == 0)
ff2d7a98 1253 fatal("%s: key_to_blob failed", __func__);
2980ea68 1254 buffer_put_string(m, blob, blen);
1255
1256 /* Save temporarily for comparison in verify */
1257 key_blob = blob;
1258 key_bloblen = blen;
1259 key_blobtype = MM_RSAUSERKEY;
1260 key_free(key);
1261 }
1262
1263 mm_append_debug(m);
1264
1265 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1266
1267 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1268 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1269 return (0);
1270}
1271
1272int
1273mm_answer_rsa_challenge(int socket, Buffer *m)
1274{
1275 Key *key = NULL;
1276 u_char *blob;
1277 u_int blen;
1278
ff2d7a98 1279 debug3("%s entering", __func__);
2980ea68 1280
1281 if (!authctxt->valid)
ff2d7a98 1282 fatal("%s: authctxt not valid", __func__);
2980ea68 1283 blob = buffer_get_string(m, &blen);
1284 if (!monitor_allowed_key(blob, blen))
ff2d7a98 1285 fatal("%s: bad key, not previously allowed", __func__);
2980ea68 1286 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
ff2d7a98 1287 fatal("%s: key type mismatch", __func__);
2980ea68 1288 if ((key = key_from_blob(blob, blen)) == NULL)
ff2d7a98 1289 fatal("%s: received bad key", __func__);
2980ea68 1290
1291 if (ssh1_challenge)
1292 BN_clear_free(ssh1_challenge);
1293 ssh1_challenge = auth_rsa_generate_challenge(key);
1294
1295 buffer_clear(m);
1296 buffer_put_bignum2(m, ssh1_challenge);
1297
ff2d7a98 1298 debug3("%s sending reply", __func__);
2980ea68 1299 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1300
1301 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1302 return (0);
1303}
1304
1305int
1306mm_answer_rsa_response(int socket, Buffer *m)
1307{
1308 Key *key = NULL;
1309 u_char *blob, *response;
1310 u_int blen, len;
1311 int success;
1312
ff2d7a98 1313 debug3("%s entering", __func__);
2980ea68 1314
1315 if (!authctxt->valid)
ff2d7a98 1316 fatal("%s: authctxt not valid", __func__);
2980ea68 1317 if (ssh1_challenge == NULL)
ff2d7a98 1318 fatal("%s: no ssh1_challenge", __func__);
2980ea68 1319
1320 blob = buffer_get_string(m, &blen);
1321 if (!monitor_allowed_key(blob, blen))
ff2d7a98 1322 fatal("%s: bad key, not previously allowed", __func__);
2980ea68 1323 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
ff2d7a98 1324 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
2980ea68 1325 if ((key = key_from_blob(blob, blen)) == NULL)
ff2d7a98 1326 fatal("%s: received bad key", __func__);
2980ea68 1327 response = buffer_get_string(m, &len);
1328 if (len != 16)
ff2d7a98 1329 fatal("%s: received bad response to challenge", __func__);
2980ea68 1330 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1331
1332 key_free(key);
1333 xfree(response);
1334
1335 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1336
1337 /* reset state */
1338 BN_clear_free(ssh1_challenge);
1339 ssh1_challenge = NULL;
1340 monitor_reset_key_state();
1341
1342 buffer_clear(m);
1343 buffer_put_int(m, success);
1344 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1345
1346 return (success);
1347}
1348
1349int
1350mm_answer_term(int socket, Buffer *req)
1351{
1352 extern struct monitor *pmonitor;
1353 int res, status;
1354
ff2d7a98 1355 debug3("%s: tearing down sessions", __func__);
2980ea68 1356
1357 /* The child is terminating */
1358 session_destroy_all(&mm_session_close);
1359
1360 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1361 if (errno != EINTR)
1362 exit(1);
1363
1364 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1365
1366 /* Terminate process */
1367 exit (res);
1368}
1369
1370void
1371monitor_apply_keystate(struct monitor *pmonitor)
1372{
1373 if (compat20) {
1374 set_newkeys(MODE_IN);
1375 set_newkeys(MODE_OUT);
1376 } else {
2980ea68 1377 packet_set_protocol_flags(child_state.ssh1protoflags);
ff2d7a98 1378 packet_set_encryption_key(child_state.ssh1key,
1379 child_state.ssh1keylen, child_state.ssh1cipher);
1380 xfree(child_state.ssh1key);
2980ea68 1381 }
1382
ff2d7a98 1383 /* for rc4 and other stateful ciphers */
2980ea68 1384 packet_set_keycontext(MODE_OUT, child_state.keyout);
1385 xfree(child_state.keyout);
1386 packet_set_keycontext(MODE_IN, child_state.keyin);
1387 xfree(child_state.keyin);
1388
1389 if (!compat20) {
1390 packet_set_iv(MODE_OUT, child_state.ivout);
1391 xfree(child_state.ivout);
1392 packet_set_iv(MODE_IN, child_state.ivin);
1393 xfree(child_state.ivin);
1394 }
1395
1396 memcpy(&incoming_stream, &child_state.incoming,
1397 sizeof(incoming_stream));
1398 memcpy(&outgoing_stream, &child_state.outgoing,
1399 sizeof(outgoing_stream));
1400
1401 /* Update with new address */
ff2d7a98 1402 if (options.compression)
1403 mm_init_compression(pmonitor->m_zlib);
2980ea68 1404
1405 /* Network I/O buffers */
1406 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1407 buffer_clear(&input);
1408 buffer_append(&input, child_state.input, child_state.ilen);
1409 memset(child_state.input, 0, child_state.ilen);
1410 xfree(child_state.input);
1411
1412 buffer_clear(&output);
1413 buffer_append(&output, child_state.output, child_state.olen);
1414 memset(child_state.output, 0, child_state.olen);
1415 xfree(child_state.output);
1416}
1417
1418static Kex *
1419mm_get_kex(Buffer *m)
1420{
1421 Kex *kex;
1422 void *blob;
1423 u_int bloblen;
1424
1425 kex = xmalloc(sizeof(*kex));
1426 memset(kex, 0, sizeof(*kex));
1427 kex->session_id = buffer_get_string(m, &kex->session_id_len);
ff2d7a98 1428 if ((session_id2 == NULL) ||
1429 (kex->session_id_len != session_id2_len) ||
1430 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1431 fatal("mm_get_get: internal error: bad session id");
2980ea68 1432 kex->we_need = buffer_get_int(m);
1433 kex->server = 1;
1434 kex->hostkey_type = buffer_get_int(m);
1435 kex->kex_type = buffer_get_int(m);
1436 blob = buffer_get_string(m, &bloblen);
1437 buffer_init(&kex->my);
1438 buffer_append(&kex->my, blob, bloblen);
1439 xfree(blob);
1440 blob = buffer_get_string(m, &bloblen);
1441 buffer_init(&kex->peer);
1442 buffer_append(&kex->peer, blob, bloblen);
1443 xfree(blob);
1444 kex->done = 1;
1445 kex->flags = buffer_get_int(m);
1446 kex->client_version_string = buffer_get_string(m, NULL);
1447 kex->server_version_string = buffer_get_string(m, NULL);
1448 kex->load_host_key=&get_hostkey_by_type;
1449 kex->host_key_index=&get_hostkey_index;
1450
1451 return (kex);
1452}
1453
1454/* This function requries careful sanity checking */
1455
1456void
1457mm_get_keystate(struct monitor *pmonitor)
1458{
1459 Buffer m;
1460 u_char *blob, *p;
1461 u_int bloblen, plen;
1462
ff2d7a98 1463 debug3("%s: Waiting for new keys", __func__);
2980ea68 1464
1465 buffer_init(&m);
1466 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1467 if (!compat20) {
1468 child_state.ssh1protoflags = buffer_get_int(&m);
1469 child_state.ssh1cipher = buffer_get_int(&m);
ff2d7a98 1470 child_state.ssh1key = buffer_get_string(&m,
1471 &child_state.ssh1keylen);
2980ea68 1472 child_state.ivout = buffer_get_string(&m,
1473 &child_state.ivoutlen);
1474 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1475 goto skip;
1476 } else {
1477 /* Get the Kex for rekeying */
1478 *pmonitor->m_pkex = mm_get_kex(&m);
1479 }
1480
1481 blob = buffer_get_string(&m, &bloblen);
1482 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1483 xfree(blob);
1484
ff2d7a98 1485 debug3("%s: Waiting for second key", __func__);
2980ea68 1486 blob = buffer_get_string(&m, &bloblen);
1487 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1488 xfree(blob);
1489
1490 /* Now get sequence numbers for the packets */
1491 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1492 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1493
1494 skip:
1495 /* Get the key context */
1496 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1497 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1498
ff2d7a98 1499 debug3("%s: Getting compression state", __func__);
2980ea68 1500 /* Get compression state */
1501 p = buffer_get_string(&m, &plen);
1502 if (plen != sizeof(child_state.outgoing))
ff2d7a98 1503 fatal("%s: bad request size", __func__);
2980ea68 1504 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1505 xfree(p);
1506
1507 p = buffer_get_string(&m, &plen);
1508 if (plen != sizeof(child_state.incoming))
ff2d7a98 1509 fatal("%s: bad request size", __func__);
2980ea68 1510 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1511 xfree(p);
1512
1513 /* Network I/O buffers */
ff2d7a98 1514 debug3("%s: Getting Network I/O buffers", __func__);
2980ea68 1515 child_state.input = buffer_get_string(&m, &child_state.ilen);
1516 child_state.output = buffer_get_string(&m, &child_state.olen);
1517
1518 buffer_free(&m);
1519}
1520
1521
1522/* Allocation functions for zlib */
1523void *
1524mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1525{
ff2d7a98 1526 int len = size * ncount;
2980ea68 1527 void *address;
1528
ff2d7a98 1529 if (len <= 0)
1530 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1531
1532 address = mm_malloc(mm, len);
2980ea68 1533
1534 return (address);
1535}
1536
1537void
1538mm_zfree(struct mm_master *mm, void *address)
1539{
1540 mm_free(mm, address);
1541}
1542
1543void
1544mm_init_compression(struct mm_master *mm)
1545{
1546 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1547 outgoing_stream.zfree = (free_func)mm_zfree;
1548 outgoing_stream.opaque = mm;
1549
1550 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1551 incoming_stream.zfree = (free_func)mm_zfree;
1552 incoming_stream.opaque = mm;
1553}
1554
1555/* XXX */
1556
1557#define FD_CLOSEONEXEC(x) do { \
1558 if (fcntl(x, F_SETFD, 1) == -1) \
1559 fatal("fcntl(%d, F_SETFD)", x); \
1560} while (0)
1561
1562static void
1563monitor_socketpair(int *pair)
1564{
1565#ifdef HAVE_SOCKETPAIR
1566 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
ff2d7a98 1567 fatal("%s: socketpair", __func__);
2980ea68 1568#else
1569 fatal("%s: UsePrivilegeSeparation=yes not supported",
ff2d7a98 1570 __func__);
2980ea68 1571#endif
1572 FD_CLOSEONEXEC(pair[0]);
1573 FD_CLOSEONEXEC(pair[1]);
1574}
1575
1576#define MM_MEMSIZE 65536
1577
1578struct monitor *
1579monitor_init(void)
1580{
1581 struct monitor *mon;
1582 int pair[2];
1583
1584 mon = xmalloc(sizeof(*mon));
1585
1586 monitor_socketpair(pair);
1587
1588 mon->m_recvfd = pair[0];
1589 mon->m_sendfd = pair[1];
1590
1591 /* Used to share zlib space across processes */
ff2d7a98 1592 if (options.compression) {
1593 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1594 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
2980ea68 1595
ff2d7a98 1596 /* Compression needs to share state across borders */
1597 mm_init_compression(mon->m_zlib);
1598 }
2980ea68 1599
1600 return mon;
1601}
1602
1603void
1604monitor_reinit(struct monitor *mon)
1605{
1606 int pair[2];
1607
1608 monitor_socketpair(pair);
1609
1610 mon->m_recvfd = pair[0];
1611 mon->m_sendfd = pair[1];
1612}
ff2d7a98 1613
1614#ifdef GSSAPI
1615
1616int
1617mm_answer_gss_setup_ctx(int socket, Buffer *m) {
1618 gss_OID_desc oid;
1619 OM_uint32 major;
c2397a66 1620 int len;
ff2d7a98 1621
c2397a66 1622 oid.elements=buffer_get_string(m,&len);
1623 oid.length=len;
ff2d7a98 1624
1625 major=ssh_gssapi_server_ctx(&gsscontext,&oid);
1626
1627 xfree(oid.elements);
1628
1629 buffer_clear(m);
1630 buffer_put_int(m,major);
1631
1632 mm_request_send(socket,MONITOR_ANS_GSSSETUP,m);
1633
1634 return(0);
1635}
1636
1637int
1638mm_answer_gss_accept_ctx(int socket, Buffer *m) {
1639 gss_buffer_desc in,out;
1640 OM_uint32 major,minor;
1641 OM_uint32 flags = 0; /* GSI needs this */
1642
1643 in.value = buffer_get_string(m,&in.length);
1644 major=ssh_gssapi_accept_ctx(gsscontext,&in,&out,&flags);
1645 xfree(in.value);
1646
1647 buffer_clear(m);
1648 buffer_put_int(m, major);
1649 buffer_put_string(m, out.value, out.length);
1650 buffer_put_int(m, flags);
1651 mm_request_send(socket,MONITOR_ANS_GSSSTEP,m);
1652
1653 gss_release_buffer(&minor, &out);
1654
1655 return(0);
1656}
1657int
1658mm_answer_gss_userok(int socket, Buffer *m) {
1659 int authenticated;
1660
1661 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1662
1663 buffer_clear(m);
1664 buffer_put_int(m, authenticated);
1665
1666 debug3("%s: sending result %d", __func__, authenticated);
1667 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
1668
1669 auth_method="gssapi";
1670
1671 /* Monitor loop will terminate if authenticated */
1672 return(authenticated);
1673}
1674int
1675mm_answer_gss_localname(int socket, Buffer *m) {
1676 char *name;
1677
1678 ssh_gssapi_localname(&name);
1679
1680 buffer_clear(m);
1681 if (name) {
1682 buffer_put_cstring(m, name);
1683 debug3("%s: sending result %s", __func__, name);
1684 xfree(name);
1685 } else {
1686 buffer_put_cstring(m, "");
1687 debug3("%s: sending result \"\"", __func__);
1688 }
1689
1690 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);
1691
1692 return(0);
1693}
1694
1695int
1696mm_answer_gss_sign(int socket, Buffer *m) {
1697 gss_buffer_desc data,hash;
1698 OM_uint32 major,minor;
1699
1700 data.value = buffer_get_string(m,&data.length);
1701 if (data.length != 16) { /* HACK - i.e. we are using SSHv1 */
1702 if (data.length != 20)
1703 fatal("%s: data length incorrect: %d", __func__, data.length);
1704
1705 /* Save the session ID - only first time round */
1706 if (session_id2_len == 0) {
1707 session_id2_len=data.length;
1708 session_id2 = xmalloc(session_id2_len);
1709 memcpy(session_id2, data.value, session_id2_len);
1710 }
1711 } /* HACK - end */
1712 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1713
1714 xfree(data.value);
1715
1716 buffer_clear(m);
1717 buffer_put_int(m, major);
1718 buffer_put_string(m, hash.value, hash.length);
1719
1720 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1721
1722 gss_release_buffer(&minor,&hash);
1723
1724 /* Turn on permissions for getpwnam */
1725 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1726
1727 return(0);
1728}
1729
98f19977 1730int
1731mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
1732 OM_uint32 major,minor;
1733 gss_OID_set mech_set;
1734 int i;
1735
1736 major=gss_indicate_mechs(&minor, &mech_set);
1737
1738 buffer_clear(m);
1739 buffer_put_int(m, major);
1740 buffer_put_int(m, mech_set->count);
1741 for (i=0; i < mech_set->count; i++) {
1742 buffer_put_string(m, mech_set->elements[i].elements,
1743 mech_set->elements[i].length);
1744 }
1745
1746 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
1747
1748 return(0);
1749}
1750
1751int
1752mm_answer_gss_display_status(int socket, Buffer *m) {
1753 OM_uint32 major,minor,status_value,message_context;
1754 int status_type;
1755 gss_OID_desc mech_type_desc;
1756 gss_OID mech_type;
1757 gss_buffer_desc status_string;
1758 u_int length;
1759
1760 status_value = buffer_get_int(m);
1761 status_type = buffer_get_int(m);
1762 mech_type_desc.elements = buffer_get_string(m, &length);
1763 mech_type_desc.length = length;
1764 if (length != 0) {
1765 mech_type = &mech_type_desc;
1766 } else if (gsscontext) {
1767 mech_type = gsscontext->oid;
1768 } else {
1769 mech_type = GSS_C_NO_OID;
1770 }
1771 message_context = buffer_get_int(m);
1772
1773 major=gss_display_status(&minor, status_value, status_type, mech_type,
1774 &message_context, &status_string);
1775
1776 buffer_clear(m);
1777 buffer_put_int(m, message_context);
1778 buffer_put_string(m, status_string.value, status_string.length);
1779
1780 mm_request_send(socket,MONITOR_ANS_GSSSTAT,m);
1781
1782 if (mech_type_desc.elements) {
1783 xfree(mech_type_desc.elements);
1784 }
1785
1786 return 0;
1787}
1788
ff2d7a98 1789#endif /* GSSAPI */
1790
1791#ifdef GSI
1792
1793int
1794mm_answer_gsi_gridmap(int socket, Buffer *m) {
1795 char *subject, *name;
1796
1797 subject = buffer_get_string(m, NULL);
1798
1799 gsi_gridmap(subject, &name);
1800
1801 buffer_clear(m);
1802 if (name) {
1803 buffer_put_cstring(m, name);
1804 debug3("%s: sending result %s", __func__, name);
1805 xfree(name);
1806 } else {
1807 buffer_put_cstring(m, "");
1808 debug3("%s: sending result \"\"", __func__);
1809 }
1810
1811 mm_request_send(socket, MONITOR_ANS_GSIGRIDMAP, m);
1812
1813 return(0);
1814}
1815
1816#endif /* GSI */
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