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826f3a39 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"
540d72c3 28RCSID("$OpenBSD: monitor.c,v 1.55 2004/02/05 05:37:17 dtucker Exp $");
826f3a39 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
b59afbfe 62#ifdef GSSAPI
63#include "ssh-gss.h"
64static Gssctxt *gsscontext = NULL;
65#endif
66
826f3a39 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;
44a053a3 91 u_char *ssh1key;
92 u_int ssh1keylen;
826f3a39 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
7cac2b65 101/* Functions on the monitor that answer unprivileged requests */
826f3a39 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 *);
7cac2b65 126int mm_answer_pam_account(int, Buffer *);
127int mm_answer_pam_init_ctx(int, Buffer *);
128int mm_answer_pam_query(int, Buffer *);
129int mm_answer_pam_respond(int, Buffer *);
130int mm_answer_pam_free_ctx(int, Buffer *);
826f3a39 131#endif
132
7cac2b65 133#ifdef GSSAPI
134int mm_answer_gss_setup_ctx(int, Buffer *);
135int mm_answer_gss_accept_ctx(int, Buffer *);
136int mm_answer_gss_userok(int, Buffer *);
540d72c3 137int mm_answer_gss_checkmic(int, Buffer *);
23987cb8 138#endif
139
b59afbfe 140#ifdef GSSAPI
141int mm_answer_gss_setup_ctx(int, Buffer *);
142int mm_answer_gss_accept_ctx(int, Buffer *);
143int mm_answer_gss_userok(int, Buffer *);
b59afbfe 144int mm_answer_gss_sign(int, Buffer *);
23987cb8 145int mm_answer_gss_error(int, Buffer *);
e23e524c 146int mm_answer_gss_indicate_mechs(int, Buffer *);
147int mm_answer_gss_localname(int, Buffer *);
b59afbfe 148#endif
149
826f3a39 150static Authctxt *authctxt;
151static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
152
153/* local state for key verify */
154static u_char *key_blob = NULL;
155static u_int key_bloblen = 0;
156static int key_blobtype = MM_NOKEY;
d03f4262 157static char *hostbased_cuser = NULL;
158static char *hostbased_chost = NULL;
826f3a39 159static char *auth_method = "unknown";
7cac2b65 160static u_int session_id2_len = 0;
44a053a3 161static u_char *session_id2 = NULL;
7cac2b65 162static pid_t monitor_child_pid;
826f3a39 163
164struct mon_table {
165 enum monitor_reqtype type;
166 int flags;
167 int (*f)(int, Buffer *);
168};
169
170#define MON_ISAUTH 0x0004 /* Required for Authentication */
171#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
172#define MON_ONCE 0x0010 /* Disable after calling */
173
174#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
175
176#define MON_PERMIT 0x1000 /* Request is permitted */
177
178struct mon_table mon_dispatch_proto20[] = {
179 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
180 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
b59afbfe 181 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
826f3a39 182 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
183 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
184 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
185#ifdef USE_PAM
e2447520 186 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
7cac2b65 187 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
188 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
189 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
190 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
191 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
826f3a39 192#endif
193#ifdef BSD_AUTH
194 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
195 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
196#endif
197#ifdef SKEY
198 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
199 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
b59afbfe 200#endif
7cac2b65 201 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
202 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
b59afbfe 203#ifdef GSSAPI
204 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
205 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
7cac2b65 206 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
b59afbfe 207 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
e23e524c 208 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
9eeaa28e 209 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
e23e524c 210 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
540d72c3 211 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
826f3a39 212#endif
826f3a39 213 {0, 0, NULL}
214};
215
216struct mon_table mon_dispatch_postauth20[] = {
b59afbfe 217#ifdef GSSAPI
218 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
219 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
220 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
23987cb8 221 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
e23e524c 222 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
b59afbfe 223#endif
826f3a39 224 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
225 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
226 {MONITOR_REQ_PTY, 0, mm_answer_pty},
227 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
228 {MONITOR_REQ_TERM, 0, mm_answer_term},
229 {0, 0, NULL}
230};
231
232struct mon_table mon_dispatch_proto15[] = {
233 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
234 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
235 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
236 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
237 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
238 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
239 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
240 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
826f3a39 241#ifdef BSD_AUTH
242 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
243 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
244#endif
245#ifdef SKEY
246 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
247 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
248#endif
b59afbfe 249#ifdef GSSAPI
250 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
251 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
252 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
253 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
9eeaa28e 254 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
b59afbfe 255#endif
826f3a39 256#ifdef USE_PAM
e2447520 257 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
7cac2b65 258 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
259 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
260 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
261 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
262 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
826f3a39 263#endif
264 {0, 0, NULL}
265};
266
267struct mon_table mon_dispatch_postauth15[] = {
268 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
269 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
270 {MONITOR_REQ_TERM, 0, mm_answer_term},
271 {0, 0, NULL}
272};
273
274struct mon_table *mon_dispatch;
275
276/* Specifies if a certain message is allowed at the moment */
277
278static void
279monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
280{
281 while (ent->f != NULL) {
282 if (ent->type == type) {
283 ent->flags &= ~MON_PERMIT;
284 ent->flags |= permit ? MON_PERMIT : 0;
285 return;
286 }
287 ent++;
288 }
289}
290
291static void
292monitor_permit_authentications(int permit)
293{
294 struct mon_table *ent = mon_dispatch;
295
296 while (ent->f != NULL) {
297 if (ent->flags & MON_AUTH) {
298 ent->flags &= ~MON_PERMIT;
299 ent->flags |= permit ? MON_PERMIT : 0;
300 }
301 ent++;
302 }
303}
304
540d72c3 305void
306monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
826f3a39 307{
308 struct mon_table *ent;
309 int authenticated = 0;
310
311 debug3("preauth child monitor started");
312
540d72c3 313 authctxt = _authctxt;
314 memset(authctxt, 0, sizeof(*authctxt));
315
826f3a39 316 if (compat20) {
317 mon_dispatch = mon_dispatch_proto20;
318
319 /* Permit requests for moduli and signatures */
320 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
321 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
b59afbfe 322#ifdef GSSAPI
323 /* and for the GSSAPI key exchange */
324 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
23987cb8 325 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
e23e524c 326 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
b59afbfe 327#endif
826f3a39 328 } else {
329 mon_dispatch = mon_dispatch_proto15;
330
331 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
332 }
333
826f3a39 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",
44a053a3 340 __func__, ent->type);
826f3a39 341 if (authctxt->pw->pw_uid == 0 &&
342 !auth_root_allowed(auth_method))
343 authenticated = 0;
344#ifdef USE_PAM
7cac2b65 345 /* PAM needs to perform account checks after auth */
540d72c3 346 if (options.use_pam && authenticated) {
7cac2b65 347 Buffer m;
348
349 buffer_init(&m);
540d72c3 350 mm_request_receive_expect(pmonitor->m_sendfd,
7cac2b65 351 MONITOR_REQ_PAM_ACCOUNT, &m);
352 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
353 buffer_free(&m);
354 }
826f3a39 355#endif
356 }
357
358 if (ent->flags & MON_AUTHDECIDE) {
359 auth_log(authctxt, authenticated, auth_method,
360 compat20 ? " ssh2" : "");
361 if (!authenticated)
362 authctxt->failures++;
363 }
364 }
365
366 if (!authctxt->valid)
44a053a3 367 fatal("%s: authenticated invalid user", __func__);
826f3a39 368
369 debug("%s: %s has been authenticated by privileged process",
44a053a3 370 __func__, authctxt->user);
826f3a39 371
372 mm_get_keystate(pmonitor);
826f3a39 373}
374
7cac2b65 375static void
376monitor_set_child_handler(pid_t pid)
377{
378 monitor_child_pid = pid;
379}
380
381static void
382monitor_child_handler(int signal)
383{
384 kill(monitor_child_pid, signal);
385}
386
826f3a39 387void
388monitor_child_postauth(struct monitor *pmonitor)
389{
7cac2b65 390 monitor_set_child_handler(pmonitor->m_pid);
391 signal(SIGHUP, &monitor_child_handler);
392 signal(SIGTERM, &monitor_child_handler);
393
826f3a39 394 if (compat20) {
395 mon_dispatch = mon_dispatch_postauth20;
396
397 /* Permit requests for moduli and signatures */
398 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
399 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
400 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
401
e23e524c 402#ifdef GSSAPI
403 /* and for the GSSAPI key exchange */
404 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
405 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
406 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
407#endif
408
826f3a39 409 } else {
410 mon_dispatch = mon_dispatch_postauth15;
411 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
412 }
9eeaa28e 413#ifdef GSSAPI
23987cb8 414 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
9eeaa28e 415#endif
826f3a39 416 if (!no_pty_flag) {
417 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
418 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
419 }
420
421 for (;;)
422 monitor_read(pmonitor, mon_dispatch, NULL);
423}
424
425void
426monitor_sync(struct monitor *pmonitor)
427{
44a053a3 428 if (options.compression) {
429 /* The member allocation is not visible, so sync it */
430 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
431 }
826f3a39 432}
433
434int
435monitor_read(struct monitor *pmonitor, struct mon_table *ent,
436 struct mon_table **pent)
437{
438 Buffer m;
439 int ret;
440 u_char type;
441
442 buffer_init(&m);
443
444 mm_request_receive(pmonitor->m_sendfd, &m);
445 type = buffer_get_char(&m);
446
44a053a3 447 debug3("%s: checking request %d", __func__, type);
826f3a39 448
449 while (ent->f != NULL) {
450 if (ent->type == type)
451 break;
452 ent++;
453 }
454
455 if (ent->f != NULL) {
456 if (!(ent->flags & MON_PERMIT))
44a053a3 457 fatal("%s: unpermitted request %d", __func__,
826f3a39 458 type);
459 ret = (*ent->f)(pmonitor->m_sendfd, &m);
460 buffer_free(&m);
461
462 /* The child may use this request only once, disable it */
463 if (ent->flags & MON_ONCE) {
44a053a3 464 debug2("%s: %d used once, disabling now", __func__,
826f3a39 465 type);
466 ent->flags &= ~MON_PERMIT;
467 }
468
469 if (pent != NULL)
470 *pent = ent;
471
472 return ret;
473 }
474
44a053a3 475 fatal("%s: unsupported request: %d", __func__, type);
826f3a39 476
477 /* NOTREACHED */
478 return (-1);
479}
480
481/* allowed key state */
482static int
483monitor_allowed_key(u_char *blob, u_int bloblen)
484{
485 /* make sure key is allowed */
486 if (key_blob == NULL || key_bloblen != bloblen ||
487 memcmp(key_blob, blob, key_bloblen))
488 return (0);
489 return (1);
490}
491
492static void
493monitor_reset_key_state(void)
494{
495 /* reset state */
496 if (key_blob != NULL)
497 xfree(key_blob);
498 if (hostbased_cuser != NULL)
499 xfree(hostbased_cuser);
500 if (hostbased_chost != NULL)
501 xfree(hostbased_chost);
502 key_blob = NULL;
503 key_bloblen = 0;
504 key_blobtype = MM_NOKEY;
505 hostbased_cuser = NULL;
506 hostbased_chost = NULL;
507}
508
509int
510mm_answer_moduli(int socket, Buffer *m)
511{
512 DH *dh;
513 int min, want, max;
514
515 min = buffer_get_int(m);
516 want = buffer_get_int(m);
517 max = buffer_get_int(m);
518
519 debug3("%s: got parameters: %d %d %d",
44a053a3 520 __func__, min, want, max);
826f3a39 521 /* We need to check here, too, in case the child got corrupted */
522 if (max < min || want < min || max < want)
523 fatal("%s: bad parameters: %d %d %d",
44a053a3 524 __func__, min, want, max);
826f3a39 525
526 buffer_clear(m);
527
528 dh = choose_dh(min, want, max);
529 if (dh == NULL) {
530 buffer_put_char(m, 0);
531 return (0);
532 } else {
533 /* Send first bignum */
534 buffer_put_char(m, 1);
535 buffer_put_bignum2(m, dh->p);
536 buffer_put_bignum2(m, dh->g);
537
538 DH_free(dh);
539 }
540 mm_request_send(socket, MONITOR_ANS_MODULI, m);
541 return (0);
542}
543
544int
545mm_answer_sign(int socket, Buffer *m)
546{
547 Key *key;
548 u_char *p;
549 u_char *signature;
550 u_int siglen, datlen;
551 int keyid;
552
44a053a3 553 debug3("%s", __func__);
826f3a39 554
555 keyid = buffer_get_int(m);
556 p = buffer_get_string(m, &datlen);
557
558 if (datlen != 20)
d03f4262 559 fatal("%s: data length incorrect: %u", __func__, datlen);
44a053a3 560
561 /* save session id, it will be passed on the first call */
562 if (session_id2_len == 0) {
563 session_id2_len = datlen;
564 session_id2 = xmalloc(session_id2_len);
565 memcpy(session_id2, p, session_id2_len);
566 }
826f3a39 567
568 if ((key = get_hostkey_by_index(keyid)) == NULL)
44a053a3 569 fatal("%s: no hostkey from index %d", __func__, keyid);
826f3a39 570 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
44a053a3 571 fatal("%s: key_sign failed", __func__);
826f3a39 572
d03f4262 573 debug3("%s: signature %p(%u)", __func__, signature, siglen);
826f3a39 574
575 buffer_clear(m);
576 buffer_put_string(m, signature, siglen);
577
578 xfree(p);
579 xfree(signature);
580
581 mm_request_send(socket, MONITOR_ANS_SIGN, m);
582
583 /* Turn on permissions for getpwnam */
584 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
585
586 return (0);
587}
588
589/* Retrieves the password entry and also checks if the user is permitted */
590
591int
592mm_answer_pwnamallow(int socket, Buffer *m)
593{
594 char *login;
595 struct passwd *pwent;
596 int allowed = 0;
597
44a053a3 598 debug3("%s", __func__);
826f3a39 599
826f3a39 600 login = buffer_get_string(m, NULL);
601
602 pwent = getpwnamallow(login);
603
b59afbfe 604 if (authctxt->user) xfree(authctxt->user);
826f3a39 605 authctxt->user = xstrdup(login);
606 setproctitle("%s [priv]", pwent ? login : "unknown");
607 xfree(login);
608
609 buffer_clear(m);
610
611 if (pwent == NULL) {
612 buffer_put_char(m, 0);
540d72c3 613 authctxt->pw = fakepw();
826f3a39 614 goto out;
615 }
616
617 allowed = 1;
618 authctxt->pw = pwent;
619 authctxt->valid = 1;
620
621 buffer_put_char(m, 1);
622 buffer_put_string(m, pwent, sizeof(struct passwd));
623 buffer_put_cstring(m, pwent->pw_name);
624 buffer_put_cstring(m, "*");
625 buffer_put_cstring(m, pwent->pw_gecos);
626#ifdef HAVE_PW_CLASS_IN_PASSWD
627 buffer_put_cstring(m, pwent->pw_class);
628#endif
629 buffer_put_cstring(m, pwent->pw_dir);
630 buffer_put_cstring(m, pwent->pw_shell);
631
632 out:
44a053a3 633 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
826f3a39 634 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
635
636 /* For SSHv1 allow authentication now */
637 if (!compat20)
638 monitor_permit_authentications(1);
639 else {
640 /* Allow service/style information on the auth context */
641 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
642 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
643 }
644
645#ifdef USE_PAM
7cac2b65 646 if (options.use_pam)
647 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
826f3a39 648#endif
649
650 return (0);
651}
652
653int mm_answer_auth2_read_banner(int socket, Buffer *m)
654{
655 char *banner;
656
657 buffer_clear(m);
658 banner = auth2_read_banner();
659 buffer_put_cstring(m, banner != NULL ? banner : "");
660 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
661
662 if (banner != NULL)
d03f4262 663 xfree(banner);
826f3a39 664
665 return (0);
666}
667
668int
669mm_answer_authserv(int socket, Buffer *m)
670{
671 monitor_permit_authentications(1);
672
673 authctxt->service = buffer_get_string(m, NULL);
674 authctxt->style = buffer_get_string(m, NULL);
675 debug3("%s: service=%s, style=%s",
44a053a3 676 __func__, authctxt->service, authctxt->style);
826f3a39 677
678 if (strlen(authctxt->style) == 0) {
679 xfree(authctxt->style);
680 authctxt->style = NULL;
681 }
682
683 return (0);
684}
685
686int
687mm_answer_authpassword(int socket, Buffer *m)
688{
689 static int call_count;
690 char *passwd;
d03f4262 691 int authenticated;
692 u_int plen;
826f3a39 693
694 passwd = buffer_get_string(m, &plen);
695 /* Only authenticate if the context is valid */
44a053a3 696 authenticated = options.password_authentication &&
7cac2b65 697 auth_password(authctxt, passwd);
826f3a39 698 memset(passwd, 0, strlen(passwd));
699 xfree(passwd);
700
701 buffer_clear(m);
702 buffer_put_int(m, authenticated);
703
44a053a3 704 debug3("%s: sending result %d", __func__, authenticated);
826f3a39 705 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
706
707 call_count++;
708 if (plen == 0 && call_count == 1)
709 auth_method = "none";
710 else
711 auth_method = "password";
712
713 /* Causes monitor loop to terminate if authenticated */
714 return (authenticated);
715}
716
717#ifdef BSD_AUTH
718int
719mm_answer_bsdauthquery(int socket, Buffer *m)
720{
721 char *name, *infotxt;
722 u_int numprompts;
723 u_int *echo_on;
724 char **prompts;
bfe49944 725 u_int success;
826f3a39 726
bfe49944 727 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
728 &prompts, &echo_on) < 0 ? 0 : 1;
826f3a39 729
730 buffer_clear(m);
bfe49944 731 buffer_put_int(m, success);
732 if (success)
826f3a39 733 buffer_put_cstring(m, prompts[0]);
734
bfe49944 735 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 736 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
737
bfe49944 738 if (success) {
826f3a39 739 xfree(name);
740 xfree(infotxt);
741 xfree(prompts);
742 xfree(echo_on);
743 }
744
745 return (0);
746}
747
748int
749mm_answer_bsdauthrespond(int socket, Buffer *m)
750{
751 char *response;
752 int authok;
753
754 if (authctxt->as == 0)
44a053a3 755 fatal("%s: no bsd auth session", __func__);
826f3a39 756
757 response = buffer_get_string(m, NULL);
44a053a3 758 authok = options.challenge_response_authentication &&
759 auth_userresponse(authctxt->as, response, 0);
826f3a39 760 authctxt->as = NULL;
44a053a3 761 debug3("%s: <%s> = <%d>", __func__, response, authok);
826f3a39 762 xfree(response);
763
764 buffer_clear(m);
765 buffer_put_int(m, authok);
766
44a053a3 767 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 768 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
769
770 auth_method = "bsdauth";
771
772 return (authok != 0);
773}
774#endif
775
776#ifdef SKEY
777int
778mm_answer_skeyquery(int socket, Buffer *m)
779{
780 struct skey skey;
781 char challenge[1024];
bfe49944 782 u_int success;
826f3a39 783
bfe49944 784 success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1;
826f3a39 785
786 buffer_clear(m);
bfe49944 787 buffer_put_int(m, success);
788 if (success)
826f3a39 789 buffer_put_cstring(m, challenge);
790
bfe49944 791 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 792 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
793
794 return (0);
795}
796
797int
798mm_answer_skeyrespond(int socket, Buffer *m)
799{
800 char *response;
801 int authok;
802
803 response = buffer_get_string(m, NULL);
804
44a053a3 805 authok = (options.challenge_response_authentication &&
806 authctxt->valid &&
826f3a39 807 skey_haskey(authctxt->pw->pw_name) == 0 &&
808 skey_passcheck(authctxt->pw->pw_name, response) != -1);
809
810 xfree(response);
811
812 buffer_clear(m);
813 buffer_put_int(m, authok);
814
44a053a3 815 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 816 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
817
818 auth_method = "skey";
819
820 return (authok != 0);
821}
822#endif
823
824#ifdef USE_PAM
825int
826mm_answer_pam_start(int socket, Buffer *m)
827{
828 char *user;
540d72c3 829
7cac2b65 830 if (!options.use_pam)
831 fatal("UsePAM not set, but ended up in %s anyway", __func__);
832
826f3a39 833 user = buffer_get_string(m, NULL);
834
835 start_pam(user);
836
837 xfree(user);
838
7cac2b65 839 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
840
826f3a39 841 return (0);
842}
7cac2b65 843
844int
845mm_answer_pam_account(int socket, Buffer *m)
846{
847 u_int ret;
540d72c3 848
7cac2b65 849 if (!options.use_pam)
850 fatal("UsePAM not set, but ended up in %s anyway", __func__);
851
852 ret = do_pam_account();
853
854 buffer_put_int(m, ret);
855
856 mm_request_send(socket, MONITOR_ANS_PAM_ACCOUNT, m);
857
858 return (ret);
859}
860
861static void *sshpam_ctxt, *sshpam_authok;
862extern KbdintDevice sshpam_device;
863
864int
865mm_answer_pam_init_ctx(int socket, Buffer *m)
866{
867
868 debug3("%s", __func__);
869 authctxt->user = buffer_get_string(m, NULL);
870 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
871 sshpam_authok = NULL;
872 buffer_clear(m);
873 if (sshpam_ctxt != NULL) {
874 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
875 buffer_put_int(m, 1);
876 } else {
877 buffer_put_int(m, 0);
878 }
879 mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m);
880 return (0);
881}
882
883int
884mm_answer_pam_query(int socket, Buffer *m)
885{
886 char *name, *info, **prompts;
887 u_int num, *echo_on;
888 int i, ret;
889
890 debug3("%s", __func__);
891 sshpam_authok = NULL;
892 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
893 if (ret == 0 && num == 0)
894 sshpam_authok = sshpam_ctxt;
895 if (num > 1 || name == NULL || info == NULL)
896 ret = -1;
897 buffer_clear(m);
898 buffer_put_int(m, ret);
899 buffer_put_cstring(m, name);
900 xfree(name);
901 buffer_put_cstring(m, info);
902 xfree(info);
903 buffer_put_int(m, num);
904 for (i = 0; i < num; ++i) {
905 buffer_put_cstring(m, prompts[i]);
906 xfree(prompts[i]);
907 buffer_put_int(m, echo_on[i]);
908 }
909 if (prompts != NULL)
910 xfree(prompts);
911 if (echo_on != NULL)
912 xfree(echo_on);
913 mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m);
914 return (0);
915}
916
917int
918mm_answer_pam_respond(int socket, Buffer *m)
919{
920 char **resp;
921 u_int num;
922 int i, ret;
923
924 debug3("%s", __func__);
925 sshpam_authok = NULL;
926 num = buffer_get_int(m);
927 if (num > 0) {
928 resp = xmalloc(num * sizeof(char *));
929 for (i = 0; i < num; ++i)
930 resp[i] = buffer_get_string(m, NULL);
931 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
932 for (i = 0; i < num; ++i)
933 xfree(resp[i]);
934 xfree(resp);
935 } else {
936 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
937 }
938 buffer_clear(m);
939 buffer_put_int(m, ret);
940 mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m);
941 auth_method = "keyboard-interactive/pam";
942 if (ret == 0)
943 sshpam_authok = sshpam_ctxt;
944 return (0);
945}
946
947int
948mm_answer_pam_free_ctx(int socket, Buffer *m)
949{
950
951 debug3("%s", __func__);
952 (sshpam_device.free_ctx)(sshpam_ctxt);
953 buffer_clear(m);
954 mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m);
955 return (sshpam_authok == sshpam_ctxt);
956}
826f3a39 957#endif
958
959static void
960mm_append_debug(Buffer *m)
961{
962 if (auth_debug_init && buffer_len(&auth_debug)) {
44a053a3 963 debug3("%s: Appending debug messages for child", __func__);
826f3a39 964 buffer_append(m, buffer_ptr(&auth_debug),
965 buffer_len(&auth_debug));
966 buffer_clear(&auth_debug);
967 }
968}
969
970int
971mm_answer_keyallowed(int socket, Buffer *m)
972{
973 Key *key;
d03f4262 974 char *cuser, *chost;
975 u_char *blob;
826f3a39 976 u_int bloblen;
977 enum mm_keytype type = 0;
978 int allowed = 0;
979
44a053a3 980 debug3("%s entering", __func__);
826f3a39 981
982 type = buffer_get_int(m);
983 cuser = buffer_get_string(m, NULL);
984 chost = buffer_get_string(m, NULL);
985 blob = buffer_get_string(m, &bloblen);
986
987 key = key_from_blob(blob, bloblen);
988
989 if ((compat20 && type == MM_RSAHOSTKEY) ||
990 (!compat20 && type != MM_RSAHOSTKEY))
44a053a3 991 fatal("%s: key type and protocol mismatch", __func__);
826f3a39 992
44a053a3 993 debug3("%s: key_from_blob: %p", __func__, key);
826f3a39 994
540d72c3 995 if (key != NULL && authctxt->valid) {
826f3a39 996 switch(type) {
997 case MM_USERKEY:
44a053a3 998 allowed = options.pubkey_authentication &&
999 user_key_allowed(authctxt->pw, key);
826f3a39 1000 break;
1001 case MM_HOSTKEY:
44a053a3 1002 allowed = options.hostbased_authentication &&
1003 hostbased_key_allowed(authctxt->pw,
826f3a39 1004 cuser, chost, key);
1005 break;
1006 case MM_RSAHOSTKEY:
1007 key->type = KEY_RSA1; /* XXX */
44a053a3 1008 allowed = options.rhosts_rsa_authentication &&
1009 auth_rhosts_rsa_key_allowed(authctxt->pw,
826f3a39 1010 cuser, chost, key);
1011 break;
1012 default:
44a053a3 1013 fatal("%s: unknown key type %d", __func__, type);
826f3a39 1014 break;
1015 }
826f3a39 1016 }
bfe49944 1017 if (key != NULL)
1018 key_free(key);
826f3a39 1019
1020 /* clear temporarily storage (used by verify) */
1021 monitor_reset_key_state();
1022
1023 if (allowed) {
1024 /* Save temporarily for comparison in verify */
1025 key_blob = blob;
1026 key_bloblen = bloblen;
1027 key_blobtype = type;
1028 hostbased_cuser = cuser;
1029 hostbased_chost = chost;
1030 }
1031
1032 debug3("%s: key %p is %s",
44a053a3 1033 __func__, key, allowed ? "allowed" : "disallowed");
826f3a39 1034
1035 buffer_clear(m);
1036 buffer_put_int(m, allowed);
bfe49944 1037 buffer_put_int(m, forced_command != NULL);
826f3a39 1038
1039 mm_append_debug(m);
1040
1041 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
1042
1043 if (type == MM_RSAHOSTKEY)
1044 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1045
1046 return (0);
1047}
1048
1049static int
1050monitor_valid_userblob(u_char *data, u_int datalen)
1051{
1052 Buffer b;
d03f4262 1053 char *p;
826f3a39 1054 u_int len;
1055 int fail = 0;
826f3a39 1056
1057 buffer_init(&b);
1058 buffer_append(&b, data, datalen);
1059
1060 if (datafellows & SSH_OLD_SESSIONID) {
44a053a3 1061 p = buffer_ptr(&b);
1062 len = buffer_len(&b);
1063 if ((session_id2 == NULL) ||
1064 (len < session_id2_len) ||
1065 (memcmp(p, session_id2, session_id2_len) != 0))
1066 fail++;
826f3a39 1067 buffer_consume(&b, session_id2_len);
1068 } else {
44a053a3 1069 p = buffer_get_string(&b, &len);
1070 if ((session_id2 == NULL) ||
1071 (len != session_id2_len) ||
1072 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 1073 fail++;
44a053a3 1074 xfree(p);
826f3a39 1075 }
1076 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1077 fail++;
1078 p = buffer_get_string(&b, NULL);
1079 if (strcmp(authctxt->user, p) != 0) {
7cac2b65 1080 logit("wrong user name passed to monitor: expected %s != %.100s",
826f3a39 1081 authctxt->user, p);
1082 fail++;
1083 }
1084 xfree(p);
1085 buffer_skip_string(&b);
1086 if (datafellows & SSH_BUG_PKAUTH) {
1087 if (!buffer_get_char(&b))
1088 fail++;
1089 } else {
1090 p = buffer_get_string(&b, NULL);
1091 if (strcmp("publickey", p) != 0)
1092 fail++;
1093 xfree(p);
1094 if (!buffer_get_char(&b))
1095 fail++;
1096 buffer_skip_string(&b);
1097 }
1098 buffer_skip_string(&b);
1099 if (buffer_len(&b) != 0)
1100 fail++;
1101 buffer_free(&b);
1102 return (fail == 0);
1103}
1104
1105static int
d03f4262 1106monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1107 char *chost)
826f3a39 1108{
1109 Buffer b;
d03f4262 1110 char *p;
826f3a39 1111 u_int len;
1112 int fail = 0;
826f3a39 1113
1114 buffer_init(&b);
1115 buffer_append(&b, data, datalen);
1116
44a053a3 1117 p = buffer_get_string(&b, &len);
1118 if ((session_id2 == NULL) ||
1119 (len != session_id2_len) ||
1120 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 1121 fail++;
44a053a3 1122 xfree(p);
1123
826f3a39 1124 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1125 fail++;
1126 p = buffer_get_string(&b, NULL);
1127 if (strcmp(authctxt->user, p) != 0) {
7cac2b65 1128 logit("wrong user name passed to monitor: expected %s != %.100s",
826f3a39 1129 authctxt->user, p);
1130 fail++;
1131 }
1132 xfree(p);
1133 buffer_skip_string(&b); /* service */
1134 p = buffer_get_string(&b, NULL);
1135 if (strcmp(p, "hostbased") != 0)
1136 fail++;
1137 xfree(p);
1138 buffer_skip_string(&b); /* pkalg */
1139 buffer_skip_string(&b); /* pkblob */
1140
1141 /* verify client host, strip trailing dot if necessary */
1142 p = buffer_get_string(&b, NULL);
1143 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1144 p[len - 1] = '\0';
1145 if (strcmp(p, chost) != 0)
1146 fail++;
1147 xfree(p);
1148
1149 /* verify client user */
1150 p = buffer_get_string(&b, NULL);
1151 if (strcmp(p, cuser) != 0)
1152 fail++;
1153 xfree(p);
1154
1155 if (buffer_len(&b) != 0)
1156 fail++;
1157 buffer_free(&b);
1158 return (fail == 0);
1159}
1160
1161int
1162mm_answer_keyverify(int socket, Buffer *m)
1163{
1164 Key *key;
1165 u_char *signature, *data, *blob;
1166 u_int signaturelen, datalen, bloblen;
1167 int verified = 0;
1168 int valid_data = 0;
1169
1170 blob = buffer_get_string(m, &bloblen);
1171 signature = buffer_get_string(m, &signaturelen);
1172 data = buffer_get_string(m, &datalen);
1173
1174 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1175 !monitor_allowed_key(blob, bloblen))
44a053a3 1176 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1177
1178 key = key_from_blob(blob, bloblen);
1179 if (key == NULL)
44a053a3 1180 fatal("%s: bad public key blob", __func__);
826f3a39 1181
1182 switch (key_blobtype) {
1183 case MM_USERKEY:
1184 valid_data = monitor_valid_userblob(data, datalen);
1185 break;
1186 case MM_HOSTKEY:
1187 valid_data = monitor_valid_hostbasedblob(data, datalen,
1188 hostbased_cuser, hostbased_chost);
1189 break;
1190 default:
1191 valid_data = 0;
1192 break;
1193 }
1194 if (!valid_data)
44a053a3 1195 fatal("%s: bad signature data blob", __func__);
826f3a39 1196
1197 verified = key_verify(key, signature, signaturelen, data, datalen);
1198 debug3("%s: key %p signature %s",
44a053a3 1199 __func__, key, verified ? "verified" : "unverified");
826f3a39 1200
1201 key_free(key);
1202 xfree(blob);
1203 xfree(signature);
1204 xfree(data);
1205
276b07a3 1206 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1207
826f3a39 1208 monitor_reset_key_state();
1209
1210 buffer_clear(m);
1211 buffer_put_int(m, verified);
1212 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1213
826f3a39 1214 return (verified);
1215}
1216
1217static void
1218mm_record_login(Session *s, struct passwd *pw)
1219{
1220 socklen_t fromlen;
1221 struct sockaddr_storage from;
1222
1223 /*
1224 * Get IP address of client. If the connection is not a socket, let
1225 * the address be 0.0.0.0.
1226 */
1227 memset(&from, 0, sizeof(from));
d03f4262 1228 fromlen = sizeof(from);
826f3a39 1229 if (packet_connection_is_on_socket()) {
826f3a39 1230 if (getpeername(packet_get_connection_in(),
1231 (struct sockaddr *) & from, &fromlen) < 0) {
1232 debug("getpeername: %.100s", strerror(errno));
540d72c3 1233 cleanup_exit(255);
826f3a39 1234 }
1235 }
1236 /* Record that there was a login on that tty from the remote host. */
1237 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
7cac2b65 1238 get_remote_name_or_ip(utmp_len, options.use_dns),
d03f4262 1239 (struct sockaddr *)&from, fromlen);
826f3a39 1240}
1241
1242static void
1243mm_session_close(Session *s)
1244{
7cac2b65 1245 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
826f3a39 1246 if (s->ttyfd != -1) {
44a053a3 1247 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
826f3a39 1248 session_pty_cleanup2(s);
1249 }
1250 s->used = 0;
1251}
1252
1253int
1254mm_answer_pty(int socket, Buffer *m)
1255{
1256 extern struct monitor *pmonitor;
1257 Session *s;
1258 int res, fd0;
1259
44a053a3 1260 debug3("%s entering", __func__);
826f3a39 1261
1262 buffer_clear(m);
1263 s = session_new();
1264 if (s == NULL)
1265 goto error;
1266 s->authctxt = authctxt;
1267 s->pw = authctxt->pw;
1268 s->pid = pmonitor->m_pid;
1269 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1270 if (res == 0)
1271 goto error;
826f3a39 1272 pty_setowner(authctxt->pw, s->tty);
1273
1274 buffer_put_int(m, 1);
1275 buffer_put_cstring(m, s->tty);
1276 mm_request_send(socket, MONITOR_ANS_PTY, m);
1277
1278 mm_send_fd(socket, s->ptyfd);
1279 mm_send_fd(socket, s->ttyfd);
1280
1281 /* We need to trick ttyslot */
1282 if (dup2(s->ttyfd, 0) == -1)
44a053a3 1283 fatal("%s: dup2", __func__);
826f3a39 1284
1285 mm_record_login(s, authctxt->pw);
1286
1287 /* Now we can close the file descriptor again */
1288 close(0);
1289
1290 /* make sure nothing uses fd 0 */
1291 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
44a053a3 1292 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
826f3a39 1293 if (fd0 != 0)
44a053a3 1294 error("%s: fd0 %d != 0", __func__, fd0);
826f3a39 1295
1296 /* slave is not needed */
1297 close(s->ttyfd);
1298 s->ttyfd = s->ptyfd;
1299 /* no need to dup() because nobody closes ptyfd */
1300 s->ptymaster = s->ptyfd;
1301
44a053a3 1302 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
826f3a39 1303
1304 return (0);
1305
1306 error:
1307 if (s != NULL)
1308 mm_session_close(s);
1309 buffer_put_int(m, 0);
1310 mm_request_send(socket, MONITOR_ANS_PTY, m);
1311 return (0);
1312}
1313
1314int
1315mm_answer_pty_cleanup(int socket, Buffer *m)
1316{
1317 Session *s;
1318 char *tty;
1319
44a053a3 1320 debug3("%s entering", __func__);
826f3a39 1321
1322 tty = buffer_get_string(m, NULL);
1323 if ((s = session_by_tty(tty)) != NULL)
1324 mm_session_close(s);
1325 buffer_clear(m);
1326 xfree(tty);
1327 return (0);
1328}
1329
1330int
1331mm_answer_sesskey(int socket, Buffer *m)
1332{
1333 BIGNUM *p;
1334 int rsafail;
1335
1336 /* Turn off permissions */
1337 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1338
1339 if ((p = BN_new()) == NULL)
44a053a3 1340 fatal("%s: BN_new", __func__);
826f3a39 1341
1342 buffer_get_bignum2(m, p);
1343
1344 rsafail = ssh1_session_key(p);
1345
1346 buffer_clear(m);
1347 buffer_put_int(m, rsafail);
1348 buffer_put_bignum2(m, p);
1349
1350 BN_clear_free(p);
1351
1352 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1353
1354 /* Turn on permissions for sessid passing */
1355 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1356
1357 return (0);
1358}
1359
1360int
1361mm_answer_sessid(int socket, Buffer *m)
1362{
1363 int i;
1364
44a053a3 1365 debug3("%s entering", __func__);
826f3a39 1366
1367 if (buffer_len(m) != 16)
44a053a3 1368 fatal("%s: bad ssh1 session id", __func__);
826f3a39 1369 for (i = 0; i < 16; i++)
1370 session_id[i] = buffer_get_char(m);
1371
1372 /* Turn on permissions for getpwnam */
1373 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1374
1375 return (0);
1376}
1377
1378int
1379mm_answer_rsa_keyallowed(int socket, Buffer *m)
1380{
1381 BIGNUM *client_n;
1382 Key *key = NULL;
1383 u_char *blob = NULL;
1384 u_int blen = 0;
1385 int allowed = 0;
1386
44a053a3 1387 debug3("%s entering", __func__);
826f3a39 1388
44a053a3 1389 if (options.rsa_authentication && authctxt->valid) {
826f3a39 1390 if ((client_n = BN_new()) == NULL)
44a053a3 1391 fatal("%s: BN_new", __func__);
826f3a39 1392 buffer_get_bignum2(m, client_n);
1393 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1394 BN_clear_free(client_n);
1395 }
1396 buffer_clear(m);
1397 buffer_put_int(m, allowed);
bfe49944 1398 buffer_put_int(m, forced_command != NULL);
826f3a39 1399
1400 /* clear temporarily storage (used by generate challenge) */
1401 monitor_reset_key_state();
1402
1403 if (allowed && key != NULL) {
1404 key->type = KEY_RSA; /* cheat for key_to_blob */
1405 if (key_to_blob(key, &blob, &blen) == 0)
44a053a3 1406 fatal("%s: key_to_blob failed", __func__);
826f3a39 1407 buffer_put_string(m, blob, blen);
1408
1409 /* Save temporarily for comparison in verify */
1410 key_blob = blob;
1411 key_bloblen = blen;
1412 key_blobtype = MM_RSAUSERKEY;
826f3a39 1413 }
bfe49944 1414 if (key != NULL)
1415 key_free(key);
826f3a39 1416
1417 mm_append_debug(m);
1418
1419 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1420
1421 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1422 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1423 return (0);
1424}
1425
1426int
1427mm_answer_rsa_challenge(int socket, Buffer *m)
1428{
1429 Key *key = NULL;
1430 u_char *blob;
1431 u_int blen;
1432
44a053a3 1433 debug3("%s entering", __func__);
826f3a39 1434
1435 if (!authctxt->valid)
44a053a3 1436 fatal("%s: authctxt not valid", __func__);
826f3a39 1437 blob = buffer_get_string(m, &blen);
1438 if (!monitor_allowed_key(blob, blen))
44a053a3 1439 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1440 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
44a053a3 1441 fatal("%s: key type mismatch", __func__);
826f3a39 1442 if ((key = key_from_blob(blob, blen)) == NULL)
44a053a3 1443 fatal("%s: received bad key", __func__);
826f3a39 1444
1445 if (ssh1_challenge)
1446 BN_clear_free(ssh1_challenge);
1447 ssh1_challenge = auth_rsa_generate_challenge(key);
1448
1449 buffer_clear(m);
1450 buffer_put_bignum2(m, ssh1_challenge);
1451
44a053a3 1452 debug3("%s sending reply", __func__);
826f3a39 1453 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1454
1455 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
bfe49944 1456
1457 xfree(blob);
1458 key_free(key);
826f3a39 1459 return (0);
1460}
1461
1462int
1463mm_answer_rsa_response(int socket, Buffer *m)
1464{
1465 Key *key = NULL;
1466 u_char *blob, *response;
1467 u_int blen, len;
1468 int success;
1469
44a053a3 1470 debug3("%s entering", __func__);
826f3a39 1471
1472 if (!authctxt->valid)
44a053a3 1473 fatal("%s: authctxt not valid", __func__);
826f3a39 1474 if (ssh1_challenge == NULL)
44a053a3 1475 fatal("%s: no ssh1_challenge", __func__);
826f3a39 1476
1477 blob = buffer_get_string(m, &blen);
1478 if (!monitor_allowed_key(blob, blen))
44a053a3 1479 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1480 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
44a053a3 1481 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
826f3a39 1482 if ((key = key_from_blob(blob, blen)) == NULL)
44a053a3 1483 fatal("%s: received bad key", __func__);
826f3a39 1484 response = buffer_get_string(m, &len);
1485 if (len != 16)
44a053a3 1486 fatal("%s: received bad response to challenge", __func__);
826f3a39 1487 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1488
bfe49944 1489 xfree(blob);
826f3a39 1490 key_free(key);
1491 xfree(response);
1492
1493 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1494
1495 /* reset state */
1496 BN_clear_free(ssh1_challenge);
1497 ssh1_challenge = NULL;
1498 monitor_reset_key_state();
1499
1500 buffer_clear(m);
1501 buffer_put_int(m, success);
1502 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1503
1504 return (success);
1505}
1506
1507int
1508mm_answer_term(int socket, Buffer *req)
1509{
1510 extern struct monitor *pmonitor;
1511 int res, status;
1512
44a053a3 1513 debug3("%s: tearing down sessions", __func__);
826f3a39 1514
1515 /* The child is terminating */
1516 session_destroy_all(&mm_session_close);
1517
1518 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1519 if (errno != EINTR)
1520 exit(1);
1521
1522 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1523
1524 /* Terminate process */
1525 exit (res);
1526}
1527
1528void
1529monitor_apply_keystate(struct monitor *pmonitor)
1530{
1531 if (compat20) {
1532 set_newkeys(MODE_IN);
1533 set_newkeys(MODE_OUT);
1534 } else {
826f3a39 1535 packet_set_protocol_flags(child_state.ssh1protoflags);
44a053a3 1536 packet_set_encryption_key(child_state.ssh1key,
1537 child_state.ssh1keylen, child_state.ssh1cipher);
1538 xfree(child_state.ssh1key);
826f3a39 1539 }
1540
44a053a3 1541 /* for rc4 and other stateful ciphers */
826f3a39 1542 packet_set_keycontext(MODE_OUT, child_state.keyout);
1543 xfree(child_state.keyout);
1544 packet_set_keycontext(MODE_IN, child_state.keyin);
1545 xfree(child_state.keyin);
1546
1547 if (!compat20) {
1548 packet_set_iv(MODE_OUT, child_state.ivout);
1549 xfree(child_state.ivout);
1550 packet_set_iv(MODE_IN, child_state.ivin);
1551 xfree(child_state.ivin);
1552 }
1553
1554 memcpy(&incoming_stream, &child_state.incoming,
1555 sizeof(incoming_stream));
1556 memcpy(&outgoing_stream, &child_state.outgoing,
1557 sizeof(outgoing_stream));
1558
1559 /* Update with new address */
44a053a3 1560 if (options.compression)
1561 mm_init_compression(pmonitor->m_zlib);
826f3a39 1562
1563 /* Network I/O buffers */
1564 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1565 buffer_clear(&input);
1566 buffer_append(&input, child_state.input, child_state.ilen);
1567 memset(child_state.input, 0, child_state.ilen);
1568 xfree(child_state.input);
1569
1570 buffer_clear(&output);
1571 buffer_append(&output, child_state.output, child_state.olen);
1572 memset(child_state.output, 0, child_state.olen);
1573 xfree(child_state.output);
1574}
1575
1576static Kex *
1577mm_get_kex(Buffer *m)
1578{
1579 Kex *kex;
1580 void *blob;
1581 u_int bloblen;
1582
1583 kex = xmalloc(sizeof(*kex));
1584 memset(kex, 0, sizeof(*kex));
1585 kex->session_id = buffer_get_string(m, &kex->session_id_len);
44a053a3 1586 if ((session_id2 == NULL) ||
1587 (kex->session_id_len != session_id2_len) ||
1588 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1589 fatal("mm_get_get: internal error: bad session id");
826f3a39 1590 kex->we_need = buffer_get_int(m);
bfe49944 1591 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1592 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
23987cb8 1593#ifdef GSSAPI
7cac2b65 1594 kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
23987cb8 1595#endif
826f3a39 1596 kex->server = 1;
1597 kex->hostkey_type = buffer_get_int(m);
1598 kex->kex_type = buffer_get_int(m);
1599 blob = buffer_get_string(m, &bloblen);
1600 buffer_init(&kex->my);
1601 buffer_append(&kex->my, blob, bloblen);
1602 xfree(blob);
1603 blob = buffer_get_string(m, &bloblen);
1604 buffer_init(&kex->peer);
1605 buffer_append(&kex->peer, blob, bloblen);
1606 xfree(blob);
1607 kex->done = 1;
1608 kex->flags = buffer_get_int(m);
1609 kex->client_version_string = buffer_get_string(m, NULL);
1610 kex->server_version_string = buffer_get_string(m, NULL);
1611 kex->load_host_key=&get_hostkey_by_type;
1612 kex->host_key_index=&get_hostkey_index;
1613
1614 return (kex);
1615}
1616
1617/* This function requries careful sanity checking */
1618
1619void
1620mm_get_keystate(struct monitor *pmonitor)
1621{
1622 Buffer m;
1623 u_char *blob, *p;
1624 u_int bloblen, plen;
7cac2b65 1625 u_int32_t seqnr, packets;
1626 u_int64_t blocks;
826f3a39 1627
44a053a3 1628 debug3("%s: Waiting for new keys", __func__);
826f3a39 1629
1630 buffer_init(&m);
1631 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1632 if (!compat20) {
1633 child_state.ssh1protoflags = buffer_get_int(&m);
1634 child_state.ssh1cipher = buffer_get_int(&m);
44a053a3 1635 child_state.ssh1key = buffer_get_string(&m,
1636 &child_state.ssh1keylen);
826f3a39 1637 child_state.ivout = buffer_get_string(&m,
1638 &child_state.ivoutlen);
1639 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1640 goto skip;
1641 } else {
1642 /* Get the Kex for rekeying */
1643 *pmonitor->m_pkex = mm_get_kex(&m);
1644 }
1645
1646 blob = buffer_get_string(&m, &bloblen);
1647 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1648 xfree(blob);
1649
44a053a3 1650 debug3("%s: Waiting for second key", __func__);
826f3a39 1651 blob = buffer_get_string(&m, &bloblen);
1652 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1653 xfree(blob);
1654
1655 /* Now get sequence numbers for the packets */
7cac2b65 1656 seqnr = buffer_get_int(&m);
1657 blocks = buffer_get_int64(&m);
1658 packets = buffer_get_int(&m);
1659 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1660 seqnr = buffer_get_int(&m);
1661 blocks = buffer_get_int64(&m);
1662 packets = buffer_get_int(&m);
1663 packet_set_state(MODE_IN, seqnr, blocks, packets);
826f3a39 1664
1665 skip:
1666 /* Get the key context */
1667 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1668 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1669
44a053a3 1670 debug3("%s: Getting compression state", __func__);
826f3a39 1671 /* Get compression state */
1672 p = buffer_get_string(&m, &plen);
1673 if (plen != sizeof(child_state.outgoing))
44a053a3 1674 fatal("%s: bad request size", __func__);
826f3a39 1675 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1676 xfree(p);
1677
1678 p = buffer_get_string(&m, &plen);
1679 if (plen != sizeof(child_state.incoming))
44a053a3 1680 fatal("%s: bad request size", __func__);
826f3a39 1681 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1682 xfree(p);
1683
1684 /* Network I/O buffers */
44a053a3 1685 debug3("%s: Getting Network I/O buffers", __func__);
826f3a39 1686 child_state.input = buffer_get_string(&m, &child_state.ilen);
1687 child_state.output = buffer_get_string(&m, &child_state.olen);
1688
1689 buffer_free(&m);
1690}
1691
1692
1693/* Allocation functions for zlib */
1694void *
1695mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1696{
bfe49944 1697 size_t len = (size_t) size * ncount;
826f3a39 1698 void *address;
1699
d03f4262 1700 if (len == 0 || ncount > SIZE_T_MAX / size)
276b07a3 1701 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1702
1703 address = mm_malloc(mm, len);
826f3a39 1704
1705 return (address);
1706}
1707
1708void
1709mm_zfree(struct mm_master *mm, void *address)
1710{
1711 mm_free(mm, address);
1712}
1713
1714void
1715mm_init_compression(struct mm_master *mm)
1716{
1717 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1718 outgoing_stream.zfree = (free_func)mm_zfree;
1719 outgoing_stream.opaque = mm;
1720
1721 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1722 incoming_stream.zfree = (free_func)mm_zfree;
1723 incoming_stream.opaque = mm;
1724}
1725
1726/* XXX */
1727
1728#define FD_CLOSEONEXEC(x) do { \
1729 if (fcntl(x, F_SETFD, 1) == -1) \
1730 fatal("fcntl(%d, F_SETFD)", x); \
1731} while (0)
1732
1733static void
1734monitor_socketpair(int *pair)
1735{
1736#ifdef HAVE_SOCKETPAIR
1737 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
44a053a3 1738 fatal("%s: socketpair", __func__);
826f3a39 1739#else
1740 fatal("%s: UsePrivilegeSeparation=yes not supported",
44a053a3 1741 __func__);
826f3a39 1742#endif
1743 FD_CLOSEONEXEC(pair[0]);
1744 FD_CLOSEONEXEC(pair[1]);
1745}
1746
1747#define MM_MEMSIZE 65536
1748
1749struct monitor *
1750monitor_init(void)
1751{
1752 struct monitor *mon;
1753 int pair[2];
1754
1755 mon = xmalloc(sizeof(*mon));
1756
540d72c3 1757 mon->m_pid = 0;
826f3a39 1758 monitor_socketpair(pair);
1759
1760 mon->m_recvfd = pair[0];
1761 mon->m_sendfd = pair[1];
1762
1763 /* Used to share zlib space across processes */
44a053a3 1764 if (options.compression) {
1765 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1766 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
826f3a39 1767
44a053a3 1768 /* Compression needs to share state across borders */
1769 mm_init_compression(mon->m_zlib);
1770 }
826f3a39 1771
1772 return mon;
1773}
1774
1775void
1776monitor_reinit(struct monitor *mon)
1777{
1778 int pair[2];
1779
1780 monitor_socketpair(pair);
1781
1782 mon->m_recvfd = pair[0];
1783 mon->m_sendfd = pair[1];
1784}
b59afbfe 1785
7cac2b65 1786#ifdef GSSAPI
1787int
1788mm_answer_gss_setup_ctx(int socket, Buffer *m)
1789{
1790 gss_OID_desc oid;
1791 OM_uint32 major;
1792 u_int len;
b59afbfe 1793
7cac2b65 1794 oid.elements = buffer_get_string(m, &len);
1795 oid.length = len;
b59afbfe 1796
7cac2b65 1797 major = ssh_gssapi_server_ctx(&gsscontext, &oid);
e23e524c 1798
7cac2b65 1799 xfree(oid.elements);
1800
1801 buffer_clear(m);
1802 buffer_put_int(m, major);
1803
1804 mm_request_send(socket,MONITOR_ANS_GSSSETUP, m);
1805
1806 /* Now we have a context, enable the step */
1807 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1808
1809 return (0);
b59afbfe 1810}
1811
1812int
7cac2b65 1813mm_answer_gss_accept_ctx(int socket, Buffer *m)
1814{
1815 gss_buffer_desc in;
1816 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1817 OM_uint32 major,minor;
1818 OM_uint32 flags = 0; /* GSI needs this */
1819 u_int len;
b59afbfe 1820
7cac2b65 1821 in.value = buffer_get_string(m, &len);
1822 in.length = len;
1823 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1824 xfree(in.value);
b59afbfe 1825
7cac2b65 1826 buffer_clear(m);
1827 buffer_put_int(m, major);
1828 buffer_put_string(m, out.value, out.length);
1829 buffer_put_int(m, flags);
1830 mm_request_send(socket, MONITOR_ANS_GSSSTEP, m);
b59afbfe 1831
7cac2b65 1832 gss_release_buffer(&minor, &out);
b59afbfe 1833
e23e524c 1834 if (major==GSS_S_COMPLETE) {
7cac2b65 1835 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1836 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1837 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
540d72c3 1838 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
e23e524c 1839 }
7cac2b65 1840 return (0);
b59afbfe 1841}
e23e524c 1842
540d72c3 1843int
1844mm_answer_gss_checkmic(int socket, Buffer *m)
1845{
1846 gss_buffer_desc gssbuf, mic;
1847 OM_uint32 ret;
1848 u_int len;
1849
1850 gssbuf.value = buffer_get_string(m, &len);
1851 gssbuf.length = len;
1852 mic.value = buffer_get_string(m, &len);
1853 mic.length = len;
1854
1855 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1856
1857 xfree(gssbuf.value);
1858 xfree(mic.value);
1859
1860 buffer_clear(m);
1861 buffer_put_int(m, ret);
1862
1863 mm_request_send(socket, MONITOR_ANS_GSSCHECKMIC, m);
1864
1865 if (!GSS_ERROR(ret))
1866 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1867
1868 return (0);
1869}
1870
b59afbfe 1871int
7cac2b65 1872mm_answer_gss_userok(int socket, Buffer *m)
1873{
b59afbfe 1874 int authenticated;
1875
7cac2b65 1876 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
b59afbfe 1877
7cac2b65 1878 buffer_clear(m);
1879 buffer_put_int(m, authenticated);
b59afbfe 1880
7cac2b65 1881 debug3("%s: sending result %d", __func__, authenticated);
1882 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
b59afbfe 1883
540d72c3 1884 auth_method="gssapi-with-mic";
7cac2b65 1885
1886 /* Monitor loop will terminate if authenticated */
1887 return (authenticated);
b59afbfe 1888}
23987cb8 1889
b59afbfe 1890int
1891mm_answer_gss_sign(int socket, Buffer *m) {
1892 gss_buffer_desc data,hash;
1893 OM_uint32 major,minor;
1894
1895 data.value = buffer_get_string(m,&data.length);
1896 if (data.length != 16) { /* HACK - i.e. we are using SSHv1 */
1897 if (data.length != 20)
1898 fatal("%s: data length incorrect: %d", __func__, data.length);
1899
1900 /* Save the session ID - only first time round */
1901 if (session_id2_len == 0) {
1902 session_id2_len=data.length;
1903 session_id2 = xmalloc(session_id2_len);
1904 memcpy(session_id2, data.value, session_id2_len);
1905 }
1906 } /* HACK - end */
1907 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1908
1909 xfree(data.value);
1910
1911 buffer_clear(m);
1912 buffer_put_int(m, major);
1913 buffer_put_string(m, hash.value, hash.length);
1914
1915 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1916
1917 gss_release_buffer(&minor,&hash);
1918
1919 /* Turn on permissions for getpwnam */
1920 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1921
1922 return(0);
1923}
1924
e23e524c 1925int
1926mm_answer_gss_error(int socket, Buffer *m) {
1927 OM_uint32 major,minor;
1928 char *msg;
1929
1930 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
1931 buffer_clear(m);
1932 buffer_put_int(m,major);
1933 buffer_put_int(m,minor);
1934 buffer_put_cstring(m,msg);
1935
1936 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
1937
1938 xfree(msg);
1939
1940 return(0);
1941}
1942
9eeaa28e 1943int
1944mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
1945 OM_uint32 major,minor;
1946 gss_OID_set mech_set;
1947 int i;
1948
1949 major=gss_indicate_mechs(&minor, &mech_set);
1950
1951 buffer_clear(m);
1952 buffer_put_int(m, major);
1953 buffer_put_int(m, mech_set->count);
1954 for (i=0; i < mech_set->count; i++) {
1955 buffer_put_string(m, mech_set->elements[i].elements,
1956 mech_set->elements[i].length);
1957 }
1958
e23e524c 1959#if !defined(MECHGLUE) /* mechglue memory management bug ??? */
1960 gss_release_oid_set(&minor,&mech_set);
1961#endif
1962
9eeaa28e 1963 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
1964
1965 return(0);
1966}
1967
1968int
e23e524c 1969mm_answer_gss_localname(int socket, Buffer *m) {
1970 char *name;
9eeaa28e 1971
e23e524c 1972 ssh_gssapi_localname(&name);
9eeaa28e 1973
e23e524c 1974 buffer_clear(m);
1975 if (name) {
1976 buffer_put_cstring(m, name);
1977 debug3("%s: sending result %s", __func__, name);
1978 xfree(name);
1979 } else {
1980 buffer_put_cstring(m, "");
1981 debug3("%s: sending result \"\"", __func__);
1982 }
1983
1984 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);
9eeaa28e 1985
23987cb8 1986 return(0);
9eeaa28e 1987}
b59afbfe 1988#endif /* GSSAPI */
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