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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"
7cac2b65 28RCSID("$OpenBSD: monitor.c,v 1.49 2003/08/28 12:54:34 markus 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 *);
23987cb8 137#endif
138
b59afbfe 139#ifdef GSSAPI
140int mm_answer_gss_setup_ctx(int, Buffer *);
141int mm_answer_gss_accept_ctx(int, Buffer *);
142int mm_answer_gss_userok(int, Buffer *);
b59afbfe 143int mm_answer_gss_sign(int, Buffer *);
23987cb8 144int mm_answer_gss_error(int, Buffer *);
e23e524c 145int mm_answer_gss_indicate_mechs(int, Buffer *);
146int mm_answer_gss_localname(int, Buffer *);
b59afbfe 147#endif
148
826f3a39 149static Authctxt *authctxt;
150static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
151
152/* local state for key verify */
153static u_char *key_blob = NULL;
154static u_int key_bloblen = 0;
155static int key_blobtype = MM_NOKEY;
d03f4262 156static char *hostbased_cuser = NULL;
157static char *hostbased_chost = NULL;
826f3a39 158static char *auth_method = "unknown";
7cac2b65 159static u_int session_id2_len = 0;
44a053a3 160static u_char *session_id2 = NULL;
7cac2b65 161static pid_t monitor_child_pid;
826f3a39 162
163struct mon_table {
164 enum monitor_reqtype type;
165 int flags;
166 int (*f)(int, Buffer *);
167};
168
169#define MON_ISAUTH 0x0004 /* Required for Authentication */
170#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
171#define MON_ONCE 0x0010 /* Disable after calling */
172
173#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
174
175#define MON_PERMIT 0x1000 /* Request is permitted */
176
177struct mon_table mon_dispatch_proto20[] = {
178 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
179 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
b59afbfe 180 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
826f3a39 181 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
182 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
183 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
184#ifdef USE_PAM
e2447520 185 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
7cac2b65 186 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
187 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
188 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
189 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
190 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
826f3a39 191#endif
192#ifdef BSD_AUTH
193 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
194 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
195#endif
196#ifdef SKEY
197 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
198 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
b59afbfe 199#endif
7cac2b65 200 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
201 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
b59afbfe 202#ifdef GSSAPI
203 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
204 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
7cac2b65 205 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
b59afbfe 206 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
e23e524c 207 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
9eeaa28e 208 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
e23e524c 209 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
826f3a39 210#endif
826f3a39 211 {0, 0, NULL}
212};
213
214struct mon_table mon_dispatch_postauth20[] = {
b59afbfe 215#ifdef GSSAPI
216 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
217 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
218 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
23987cb8 219 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
e23e524c 220 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
b59afbfe 221#endif
826f3a39 222 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
223 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
224 {MONITOR_REQ_PTY, 0, mm_answer_pty},
225 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
226 {MONITOR_REQ_TERM, 0, mm_answer_term},
227 {0, 0, NULL}
228};
229
230struct mon_table mon_dispatch_proto15[] = {
231 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
232 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
233 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
234 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
235 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
236 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
237 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
238 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
826f3a39 239#ifdef BSD_AUTH
240 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
241 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
242#endif
243#ifdef SKEY
244 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
245 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
246#endif
b59afbfe 247#ifdef GSSAPI
248 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
249 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
250 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
251 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
9eeaa28e 252 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
b59afbfe 253#endif
826f3a39 254#ifdef USE_PAM
e2447520 255 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
7cac2b65 256 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
257 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
258 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
259 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
260 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
826f3a39 261#endif
262 {0, 0, NULL}
263};
264
265struct mon_table mon_dispatch_postauth15[] = {
266 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
267 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
268 {MONITOR_REQ_TERM, 0, mm_answer_term},
269 {0, 0, NULL}
270};
271
272struct mon_table *mon_dispatch;
273
274/* Specifies if a certain message is allowed at the moment */
275
276static void
277monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
278{
279 while (ent->f != NULL) {
280 if (ent->type == type) {
281 ent->flags &= ~MON_PERMIT;
282 ent->flags |= permit ? MON_PERMIT : 0;
283 return;
284 }
285 ent++;
286 }
287}
288
289static void
290monitor_permit_authentications(int permit)
291{
292 struct mon_table *ent = mon_dispatch;
293
294 while (ent->f != NULL) {
295 if (ent->flags & MON_AUTH) {
296 ent->flags &= ~MON_PERMIT;
297 ent->flags |= permit ? MON_PERMIT : 0;
298 }
299 ent++;
300 }
301}
302
303Authctxt *
304monitor_child_preauth(struct monitor *pmonitor)
305{
306 struct mon_table *ent;
307 int authenticated = 0;
308
309 debug3("preauth child monitor started");
310
311 if (compat20) {
312 mon_dispatch = mon_dispatch_proto20;
313
314 /* Permit requests for moduli and signatures */
315 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
316 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
b59afbfe 317#ifdef GSSAPI
318 /* and for the GSSAPI key exchange */
319 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
23987cb8 320 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
e23e524c 321 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
b59afbfe 322#endif
826f3a39 323 } else {
324 mon_dispatch = mon_dispatch_proto15;
325
326 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
327 }
328
329 authctxt = authctxt_new();
330
331 /* The first few requests do not require asynchronous access */
332 while (!authenticated) {
333 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
334 if (authenticated) {
335 if (!(ent->flags & MON_AUTHDECIDE))
336 fatal("%s: unexpected authentication from %d",
44a053a3 337 __func__, ent->type);
826f3a39 338 if (authctxt->pw->pw_uid == 0 &&
339 !auth_root_allowed(auth_method))
340 authenticated = 0;
341#ifdef USE_PAM
7cac2b65 342 /* PAM needs to perform account checks after auth */
343 if (options.use_pam) {
344 Buffer m;
345
346 buffer_init(&m);
347 mm_request_receive_expect(pmonitor->m_sendfd,
348 MONITOR_REQ_PAM_ACCOUNT, &m);
349 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
350 buffer_free(&m);
351 }
826f3a39 352#endif
353 }
354
355 if (ent->flags & MON_AUTHDECIDE) {
356 auth_log(authctxt, authenticated, auth_method,
357 compat20 ? " ssh2" : "");
358 if (!authenticated)
359 authctxt->failures++;
360 }
361 }
362
363 if (!authctxt->valid)
44a053a3 364 fatal("%s: authenticated invalid user", __func__);
826f3a39 365
366 debug("%s: %s has been authenticated by privileged process",
44a053a3 367 __func__, authctxt->user);
826f3a39 368
369 mm_get_keystate(pmonitor);
370
371 return (authctxt);
372}
373
7cac2b65 374static void
375monitor_set_child_handler(pid_t pid)
376{
377 monitor_child_pid = pid;
378}
379
380static void
381monitor_child_handler(int signal)
382{
383 kill(monitor_child_pid, signal);
384}
385
826f3a39 386void
387monitor_child_postauth(struct monitor *pmonitor)
388{
7cac2b65 389 monitor_set_child_handler(pmonitor->m_pid);
390 signal(SIGHUP, &monitor_child_handler);
391 signal(SIGTERM, &monitor_child_handler);
392
826f3a39 393 if (compat20) {
394 mon_dispatch = mon_dispatch_postauth20;
395
396 /* Permit requests for moduli and signatures */
397 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
398 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
399 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
400
e23e524c 401#ifdef GSSAPI
402 /* and for the GSSAPI key exchange */
403 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
404 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
405 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
406#endif
407
826f3a39 408 } else {
409 mon_dispatch = mon_dispatch_postauth15;
410 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
411 }
9eeaa28e 412#ifdef GSSAPI
23987cb8 413 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
9eeaa28e 414#endif
826f3a39 415 if (!no_pty_flag) {
416 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
417 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
418 }
419
420 for (;;)
421 monitor_read(pmonitor, mon_dispatch, NULL);
422}
423
424void
425monitor_sync(struct monitor *pmonitor)
426{
44a053a3 427 if (options.compression) {
428 /* The member allocation is not visible, so sync it */
429 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
430 }
826f3a39 431}
432
433int
434monitor_read(struct monitor *pmonitor, struct mon_table *ent,
435 struct mon_table **pent)
436{
437 Buffer m;
438 int ret;
439 u_char type;
440
441 buffer_init(&m);
442
443 mm_request_receive(pmonitor->m_sendfd, &m);
444 type = buffer_get_char(&m);
445
44a053a3 446 debug3("%s: checking request %d", __func__, type);
826f3a39 447
448 while (ent->f != NULL) {
449 if (ent->type == type)
450 break;
451 ent++;
452 }
453
454 if (ent->f != NULL) {
455 if (!(ent->flags & MON_PERMIT))
44a053a3 456 fatal("%s: unpermitted request %d", __func__,
826f3a39 457 type);
458 ret = (*ent->f)(pmonitor->m_sendfd, &m);
459 buffer_free(&m);
460
461 /* The child may use this request only once, disable it */
462 if (ent->flags & MON_ONCE) {
44a053a3 463 debug2("%s: %d used once, disabling now", __func__,
826f3a39 464 type);
465 ent->flags &= ~MON_PERMIT;
466 }
467
468 if (pent != NULL)
469 *pent = ent;
470
471 return ret;
472 }
473
44a053a3 474 fatal("%s: unsupported request: %d", __func__, type);
826f3a39 475
476 /* NOTREACHED */
477 return (-1);
478}
479
480/* allowed key state */
481static int
482monitor_allowed_key(u_char *blob, u_int bloblen)
483{
484 /* make sure key is allowed */
485 if (key_blob == NULL || key_bloblen != bloblen ||
486 memcmp(key_blob, blob, key_bloblen))
487 return (0);
488 return (1);
489}
490
491static void
492monitor_reset_key_state(void)
493{
494 /* reset state */
495 if (key_blob != NULL)
496 xfree(key_blob);
497 if (hostbased_cuser != NULL)
498 xfree(hostbased_cuser);
499 if (hostbased_chost != NULL)
500 xfree(hostbased_chost);
501 key_blob = NULL;
502 key_bloblen = 0;
503 key_blobtype = MM_NOKEY;
504 hostbased_cuser = NULL;
505 hostbased_chost = NULL;
506}
507
508int
509mm_answer_moduli(int socket, Buffer *m)
510{
511 DH *dh;
512 int min, want, max;
513
514 min = buffer_get_int(m);
515 want = buffer_get_int(m);
516 max = buffer_get_int(m);
517
518 debug3("%s: got parameters: %d %d %d",
44a053a3 519 __func__, min, want, max);
826f3a39 520 /* We need to check here, too, in case the child got corrupted */
521 if (max < min || want < min || max < want)
522 fatal("%s: bad parameters: %d %d %d",
44a053a3 523 __func__, min, want, max);
826f3a39 524
525 buffer_clear(m);
526
527 dh = choose_dh(min, want, max);
528 if (dh == NULL) {
529 buffer_put_char(m, 0);
530 return (0);
531 } else {
532 /* Send first bignum */
533 buffer_put_char(m, 1);
534 buffer_put_bignum2(m, dh->p);
535 buffer_put_bignum2(m, dh->g);
536
537 DH_free(dh);
538 }
539 mm_request_send(socket, MONITOR_ANS_MODULI, m);
540 return (0);
541}
542
543int
544mm_answer_sign(int socket, Buffer *m)
545{
546 Key *key;
547 u_char *p;
548 u_char *signature;
549 u_int siglen, datlen;
550 int keyid;
551
44a053a3 552 debug3("%s", __func__);
826f3a39 553
554 keyid = buffer_get_int(m);
555 p = buffer_get_string(m, &datlen);
556
557 if (datlen != 20)
d03f4262 558 fatal("%s: data length incorrect: %u", __func__, datlen);
44a053a3 559
560 /* save session id, it will be passed on the first call */
561 if (session_id2_len == 0) {
562 session_id2_len = datlen;
563 session_id2 = xmalloc(session_id2_len);
564 memcpy(session_id2, p, session_id2_len);
565 }
826f3a39 566
567 if ((key = get_hostkey_by_index(keyid)) == NULL)
44a053a3 568 fatal("%s: no hostkey from index %d", __func__, keyid);
826f3a39 569 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
44a053a3 570 fatal("%s: key_sign failed", __func__);
826f3a39 571
d03f4262 572 debug3("%s: signature %p(%u)", __func__, signature, siglen);
826f3a39 573
574 buffer_clear(m);
575 buffer_put_string(m, signature, siglen);
576
577 xfree(p);
578 xfree(signature);
579
580 mm_request_send(socket, MONITOR_ANS_SIGN, m);
581
582 /* Turn on permissions for getpwnam */
583 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
584
585 return (0);
586}
587
588/* Retrieves the password entry and also checks if the user is permitted */
589
590int
591mm_answer_pwnamallow(int socket, Buffer *m)
592{
593 char *login;
594 struct passwd *pwent;
595 int allowed = 0;
596
44a053a3 597 debug3("%s", __func__);
826f3a39 598
826f3a39 599 login = buffer_get_string(m, NULL);
600
601 pwent = getpwnamallow(login);
602
b59afbfe 603 if (authctxt->user) xfree(authctxt->user);
826f3a39 604 authctxt->user = xstrdup(login);
605 setproctitle("%s [priv]", pwent ? login : "unknown");
606 xfree(login);
607
608 buffer_clear(m);
609
610 if (pwent == NULL) {
611 buffer_put_char(m, 0);
612 goto out;
613 }
614
615 allowed = 1;
616 authctxt->pw = pwent;
617 authctxt->valid = 1;
618
619 buffer_put_char(m, 1);
620 buffer_put_string(m, pwent, sizeof(struct passwd));
621 buffer_put_cstring(m, pwent->pw_name);
622 buffer_put_cstring(m, "*");
623 buffer_put_cstring(m, pwent->pw_gecos);
624#ifdef HAVE_PW_CLASS_IN_PASSWD
625 buffer_put_cstring(m, pwent->pw_class);
626#endif
627 buffer_put_cstring(m, pwent->pw_dir);
628 buffer_put_cstring(m, pwent->pw_shell);
629
630 out:
44a053a3 631 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
826f3a39 632 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
633
634 /* For SSHv1 allow authentication now */
635 if (!compat20)
636 monitor_permit_authentications(1);
637 else {
638 /* Allow service/style information on the auth context */
639 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
640 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
641 }
642
643#ifdef USE_PAM
7cac2b65 644 if (options.use_pam)
645 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
826f3a39 646#endif
647
648 return (0);
649}
650
651int mm_answer_auth2_read_banner(int socket, Buffer *m)
652{
653 char *banner;
654
655 buffer_clear(m);
656 banner = auth2_read_banner();
657 buffer_put_cstring(m, banner != NULL ? banner : "");
658 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
659
660 if (banner != NULL)
d03f4262 661 xfree(banner);
826f3a39 662
663 return (0);
664}
665
666int
667mm_answer_authserv(int socket, Buffer *m)
668{
669 monitor_permit_authentications(1);
670
671 authctxt->service = buffer_get_string(m, NULL);
672 authctxt->style = buffer_get_string(m, NULL);
673 debug3("%s: service=%s, style=%s",
44a053a3 674 __func__, authctxt->service, authctxt->style);
826f3a39 675
676 if (strlen(authctxt->style) == 0) {
677 xfree(authctxt->style);
678 authctxt->style = NULL;
679 }
680
681 return (0);
682}
683
684int
685mm_answer_authpassword(int socket, Buffer *m)
686{
687 static int call_count;
688 char *passwd;
d03f4262 689 int authenticated;
690 u_int plen;
826f3a39 691
692 passwd = buffer_get_string(m, &plen);
693 /* Only authenticate if the context is valid */
44a053a3 694 authenticated = options.password_authentication &&
7cac2b65 695 auth_password(authctxt, passwd);
826f3a39 696 memset(passwd, 0, strlen(passwd));
697 xfree(passwd);
698
699 buffer_clear(m);
700 buffer_put_int(m, authenticated);
701
44a053a3 702 debug3("%s: sending result %d", __func__, authenticated);
826f3a39 703 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
704
705 call_count++;
706 if (plen == 0 && call_count == 1)
707 auth_method = "none";
708 else
709 auth_method = "password";
710
711 /* Causes monitor loop to terminate if authenticated */
712 return (authenticated);
713}
714
715#ifdef BSD_AUTH
716int
717mm_answer_bsdauthquery(int socket, Buffer *m)
718{
719 char *name, *infotxt;
720 u_int numprompts;
721 u_int *echo_on;
722 char **prompts;
bfe49944 723 u_int success;
826f3a39 724
bfe49944 725 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
726 &prompts, &echo_on) < 0 ? 0 : 1;
826f3a39 727
728 buffer_clear(m);
bfe49944 729 buffer_put_int(m, success);
730 if (success)
826f3a39 731 buffer_put_cstring(m, prompts[0]);
732
bfe49944 733 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 734 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
735
bfe49944 736 if (success) {
826f3a39 737 xfree(name);
738 xfree(infotxt);
739 xfree(prompts);
740 xfree(echo_on);
741 }
742
743 return (0);
744}
745
746int
747mm_answer_bsdauthrespond(int socket, Buffer *m)
748{
749 char *response;
750 int authok;
751
752 if (authctxt->as == 0)
44a053a3 753 fatal("%s: no bsd auth session", __func__);
826f3a39 754
755 response = buffer_get_string(m, NULL);
44a053a3 756 authok = options.challenge_response_authentication &&
757 auth_userresponse(authctxt->as, response, 0);
826f3a39 758 authctxt->as = NULL;
44a053a3 759 debug3("%s: <%s> = <%d>", __func__, response, authok);
826f3a39 760 xfree(response);
761
762 buffer_clear(m);
763 buffer_put_int(m, authok);
764
44a053a3 765 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 766 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
767
768 auth_method = "bsdauth";
769
770 return (authok != 0);
771}
772#endif
773
774#ifdef SKEY
775int
776mm_answer_skeyquery(int socket, Buffer *m)
777{
778 struct skey skey;
779 char challenge[1024];
bfe49944 780 u_int success;
826f3a39 781
bfe49944 782 success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1;
826f3a39 783
784 buffer_clear(m);
bfe49944 785 buffer_put_int(m, success);
786 if (success)
826f3a39 787 buffer_put_cstring(m, challenge);
788
bfe49944 789 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 790 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
791
792 return (0);
793}
794
795int
796mm_answer_skeyrespond(int socket, Buffer *m)
797{
798 char *response;
799 int authok;
800
801 response = buffer_get_string(m, NULL);
802
44a053a3 803 authok = (options.challenge_response_authentication &&
804 authctxt->valid &&
826f3a39 805 skey_haskey(authctxt->pw->pw_name) == 0 &&
806 skey_passcheck(authctxt->pw->pw_name, response) != -1);
807
808 xfree(response);
809
810 buffer_clear(m);
811 buffer_put_int(m, authok);
812
44a053a3 813 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 814 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
815
816 auth_method = "skey";
817
818 return (authok != 0);
819}
820#endif
821
822#ifdef USE_PAM
823int
824mm_answer_pam_start(int socket, Buffer *m)
825{
826 char *user;
827
7cac2b65 828 if (!options.use_pam)
829 fatal("UsePAM not set, but ended up in %s anyway", __func__);
830
826f3a39 831 user = buffer_get_string(m, NULL);
832
833 start_pam(user);
834
835 xfree(user);
836
7cac2b65 837 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
838
826f3a39 839 return (0);
840}
7cac2b65 841
842int
843mm_answer_pam_account(int socket, Buffer *m)
844{
845 u_int ret;
846
847 if (!options.use_pam)
848 fatal("UsePAM not set, but ended up in %s anyway", __func__);
849
850 ret = do_pam_account();
851
852 buffer_put_int(m, ret);
853
854 mm_request_send(socket, MONITOR_ANS_PAM_ACCOUNT, m);
855
856 return (ret);
857}
858
859static void *sshpam_ctxt, *sshpam_authok;
860extern KbdintDevice sshpam_device;
861
862int
863mm_answer_pam_init_ctx(int socket, Buffer *m)
864{
865
866 debug3("%s", __func__);
867 authctxt->user = buffer_get_string(m, NULL);
868 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
869 sshpam_authok = NULL;
870 buffer_clear(m);
871 if (sshpam_ctxt != NULL) {
872 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
873 buffer_put_int(m, 1);
874 } else {
875 buffer_put_int(m, 0);
876 }
877 mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m);
878 return (0);
879}
880
881int
882mm_answer_pam_query(int socket, Buffer *m)
883{
884 char *name, *info, **prompts;
885 u_int num, *echo_on;
886 int i, ret;
887
888 debug3("%s", __func__);
889 sshpam_authok = NULL;
890 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
891 if (ret == 0 && num == 0)
892 sshpam_authok = sshpam_ctxt;
893 if (num > 1 || name == NULL || info == NULL)
894 ret = -1;
895 buffer_clear(m);
896 buffer_put_int(m, ret);
897 buffer_put_cstring(m, name);
898 xfree(name);
899 buffer_put_cstring(m, info);
900 xfree(info);
901 buffer_put_int(m, num);
902 for (i = 0; i < num; ++i) {
903 buffer_put_cstring(m, prompts[i]);
904 xfree(prompts[i]);
905 buffer_put_int(m, echo_on[i]);
906 }
907 if (prompts != NULL)
908 xfree(prompts);
909 if (echo_on != NULL)
910 xfree(echo_on);
911 mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m);
912 return (0);
913}
914
915int
916mm_answer_pam_respond(int socket, Buffer *m)
917{
918 char **resp;
919 u_int num;
920 int i, ret;
921
922 debug3("%s", __func__);
923 sshpam_authok = NULL;
924 num = buffer_get_int(m);
925 if (num > 0) {
926 resp = xmalloc(num * sizeof(char *));
927 for (i = 0; i < num; ++i)
928 resp[i] = buffer_get_string(m, NULL);
929 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
930 for (i = 0; i < num; ++i)
931 xfree(resp[i]);
932 xfree(resp);
933 } else {
934 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
935 }
936 buffer_clear(m);
937 buffer_put_int(m, ret);
938 mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m);
939 auth_method = "keyboard-interactive/pam";
940 if (ret == 0)
941 sshpam_authok = sshpam_ctxt;
942 return (0);
943}
944
945int
946mm_answer_pam_free_ctx(int socket, Buffer *m)
947{
948
949 debug3("%s", __func__);
950 (sshpam_device.free_ctx)(sshpam_ctxt);
951 buffer_clear(m);
952 mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m);
953 return (sshpam_authok == sshpam_ctxt);
954}
826f3a39 955#endif
956
957static void
958mm_append_debug(Buffer *m)
959{
960 if (auth_debug_init && buffer_len(&auth_debug)) {
44a053a3 961 debug3("%s: Appending debug messages for child", __func__);
826f3a39 962 buffer_append(m, buffer_ptr(&auth_debug),
963 buffer_len(&auth_debug));
964 buffer_clear(&auth_debug);
965 }
966}
967
968int
969mm_answer_keyallowed(int socket, Buffer *m)
970{
971 Key *key;
d03f4262 972 char *cuser, *chost;
973 u_char *blob;
826f3a39 974 u_int bloblen;
975 enum mm_keytype type = 0;
976 int allowed = 0;
977
44a053a3 978 debug3("%s entering", __func__);
826f3a39 979
980 type = buffer_get_int(m);
981 cuser = buffer_get_string(m, NULL);
982 chost = buffer_get_string(m, NULL);
983 blob = buffer_get_string(m, &bloblen);
984
985 key = key_from_blob(blob, bloblen);
986
987 if ((compat20 && type == MM_RSAHOSTKEY) ||
988 (!compat20 && type != MM_RSAHOSTKEY))
44a053a3 989 fatal("%s: key type and protocol mismatch", __func__);
826f3a39 990
44a053a3 991 debug3("%s: key_from_blob: %p", __func__, key);
826f3a39 992
993 if (key != NULL && authctxt->pw != NULL) {
994 switch(type) {
995 case MM_USERKEY:
44a053a3 996 allowed = options.pubkey_authentication &&
997 user_key_allowed(authctxt->pw, key);
826f3a39 998 break;
999 case MM_HOSTKEY:
44a053a3 1000 allowed = options.hostbased_authentication &&
1001 hostbased_key_allowed(authctxt->pw,
826f3a39 1002 cuser, chost, key);
1003 break;
1004 case MM_RSAHOSTKEY:
1005 key->type = KEY_RSA1; /* XXX */
44a053a3 1006 allowed = options.rhosts_rsa_authentication &&
1007 auth_rhosts_rsa_key_allowed(authctxt->pw,
826f3a39 1008 cuser, chost, key);
1009 break;
1010 default:
44a053a3 1011 fatal("%s: unknown key type %d", __func__, type);
826f3a39 1012 break;
1013 }
826f3a39 1014 }
bfe49944 1015 if (key != NULL)
1016 key_free(key);
826f3a39 1017
1018 /* clear temporarily storage (used by verify) */
1019 monitor_reset_key_state();
1020
1021 if (allowed) {
1022 /* Save temporarily for comparison in verify */
1023 key_blob = blob;
1024 key_bloblen = bloblen;
1025 key_blobtype = type;
1026 hostbased_cuser = cuser;
1027 hostbased_chost = chost;
1028 }
1029
1030 debug3("%s: key %p is %s",
44a053a3 1031 __func__, key, allowed ? "allowed" : "disallowed");
826f3a39 1032
1033 buffer_clear(m);
1034 buffer_put_int(m, allowed);
bfe49944 1035 buffer_put_int(m, forced_command != NULL);
826f3a39 1036
1037 mm_append_debug(m);
1038
1039 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
1040
1041 if (type == MM_RSAHOSTKEY)
1042 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1043
1044 return (0);
1045}
1046
1047static int
1048monitor_valid_userblob(u_char *data, u_int datalen)
1049{
1050 Buffer b;
d03f4262 1051 char *p;
826f3a39 1052 u_int len;
1053 int fail = 0;
826f3a39 1054
1055 buffer_init(&b);
1056 buffer_append(&b, data, datalen);
1057
1058 if (datafellows & SSH_OLD_SESSIONID) {
44a053a3 1059 p = buffer_ptr(&b);
1060 len = buffer_len(&b);
1061 if ((session_id2 == NULL) ||
1062 (len < session_id2_len) ||
1063 (memcmp(p, session_id2, session_id2_len) != 0))
1064 fail++;
826f3a39 1065 buffer_consume(&b, session_id2_len);
1066 } else {
44a053a3 1067 p = buffer_get_string(&b, &len);
1068 if ((session_id2 == NULL) ||
1069 (len != session_id2_len) ||
1070 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 1071 fail++;
44a053a3 1072 xfree(p);
826f3a39 1073 }
1074 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1075 fail++;
1076 p = buffer_get_string(&b, NULL);
1077 if (strcmp(authctxt->user, p) != 0) {
7cac2b65 1078 logit("wrong user name passed to monitor: expected %s != %.100s",
826f3a39 1079 authctxt->user, p);
1080 fail++;
1081 }
1082 xfree(p);
1083 buffer_skip_string(&b);
1084 if (datafellows & SSH_BUG_PKAUTH) {
1085 if (!buffer_get_char(&b))
1086 fail++;
1087 } else {
1088 p = buffer_get_string(&b, NULL);
1089 if (strcmp("publickey", p) != 0)
1090 fail++;
1091 xfree(p);
1092 if (!buffer_get_char(&b))
1093 fail++;
1094 buffer_skip_string(&b);
1095 }
1096 buffer_skip_string(&b);
1097 if (buffer_len(&b) != 0)
1098 fail++;
1099 buffer_free(&b);
1100 return (fail == 0);
1101}
1102
1103static int
d03f4262 1104monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1105 char *chost)
826f3a39 1106{
1107 Buffer b;
d03f4262 1108 char *p;
826f3a39 1109 u_int len;
1110 int fail = 0;
826f3a39 1111
1112 buffer_init(&b);
1113 buffer_append(&b, data, datalen);
1114
44a053a3 1115 p = buffer_get_string(&b, &len);
1116 if ((session_id2 == NULL) ||
1117 (len != session_id2_len) ||
1118 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 1119 fail++;
44a053a3 1120 xfree(p);
1121
826f3a39 1122 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1123 fail++;
1124 p = buffer_get_string(&b, NULL);
1125 if (strcmp(authctxt->user, p) != 0) {
7cac2b65 1126 logit("wrong user name passed to monitor: expected %s != %.100s",
826f3a39 1127 authctxt->user, p);
1128 fail++;
1129 }
1130 xfree(p);
1131 buffer_skip_string(&b); /* service */
1132 p = buffer_get_string(&b, NULL);
1133 if (strcmp(p, "hostbased") != 0)
1134 fail++;
1135 xfree(p);
1136 buffer_skip_string(&b); /* pkalg */
1137 buffer_skip_string(&b); /* pkblob */
1138
1139 /* verify client host, strip trailing dot if necessary */
1140 p = buffer_get_string(&b, NULL);
1141 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1142 p[len - 1] = '\0';
1143 if (strcmp(p, chost) != 0)
1144 fail++;
1145 xfree(p);
1146
1147 /* verify client user */
1148 p = buffer_get_string(&b, NULL);
1149 if (strcmp(p, cuser) != 0)
1150 fail++;
1151 xfree(p);
1152
1153 if (buffer_len(&b) != 0)
1154 fail++;
1155 buffer_free(&b);
1156 return (fail == 0);
1157}
1158
1159int
1160mm_answer_keyverify(int socket, Buffer *m)
1161{
1162 Key *key;
1163 u_char *signature, *data, *blob;
1164 u_int signaturelen, datalen, bloblen;
1165 int verified = 0;
1166 int valid_data = 0;
1167
1168 blob = buffer_get_string(m, &bloblen);
1169 signature = buffer_get_string(m, &signaturelen);
1170 data = buffer_get_string(m, &datalen);
1171
1172 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1173 !monitor_allowed_key(blob, bloblen))
44a053a3 1174 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1175
1176 key = key_from_blob(blob, bloblen);
1177 if (key == NULL)
44a053a3 1178 fatal("%s: bad public key blob", __func__);
826f3a39 1179
1180 switch (key_blobtype) {
1181 case MM_USERKEY:
1182 valid_data = monitor_valid_userblob(data, datalen);
1183 break;
1184 case MM_HOSTKEY:
1185 valid_data = monitor_valid_hostbasedblob(data, datalen,
1186 hostbased_cuser, hostbased_chost);
1187 break;
1188 default:
1189 valid_data = 0;
1190 break;
1191 }
1192 if (!valid_data)
44a053a3 1193 fatal("%s: bad signature data blob", __func__);
826f3a39 1194
1195 verified = key_verify(key, signature, signaturelen, data, datalen);
1196 debug3("%s: key %p signature %s",
44a053a3 1197 __func__, key, verified ? "verified" : "unverified");
826f3a39 1198
1199 key_free(key);
1200 xfree(blob);
1201 xfree(signature);
1202 xfree(data);
1203
276b07a3 1204 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1205
826f3a39 1206 monitor_reset_key_state();
1207
1208 buffer_clear(m);
1209 buffer_put_int(m, verified);
1210 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1211
826f3a39 1212 return (verified);
1213}
1214
1215static void
1216mm_record_login(Session *s, struct passwd *pw)
1217{
1218 socklen_t fromlen;
1219 struct sockaddr_storage from;
1220
1221 /*
1222 * Get IP address of client. If the connection is not a socket, let
1223 * the address be 0.0.0.0.
1224 */
1225 memset(&from, 0, sizeof(from));
d03f4262 1226 fromlen = sizeof(from);
826f3a39 1227 if (packet_connection_is_on_socket()) {
826f3a39 1228 if (getpeername(packet_get_connection_in(),
1229 (struct sockaddr *) & from, &fromlen) < 0) {
1230 debug("getpeername: %.100s", strerror(errno));
1231 fatal_cleanup();
1232 }
1233 }
1234 /* Record that there was a login on that tty from the remote host. */
1235 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
7cac2b65 1236 get_remote_name_or_ip(utmp_len, options.use_dns),
d03f4262 1237 (struct sockaddr *)&from, fromlen);
826f3a39 1238}
1239
1240static void
1241mm_session_close(Session *s)
1242{
7cac2b65 1243 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
826f3a39 1244 if (s->ttyfd != -1) {
44a053a3 1245 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
826f3a39 1246 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
1247 session_pty_cleanup2(s);
1248 }
1249 s->used = 0;
1250}
1251
1252int
1253mm_answer_pty(int socket, Buffer *m)
1254{
1255 extern struct monitor *pmonitor;
1256 Session *s;
1257 int res, fd0;
1258
44a053a3 1259 debug3("%s entering", __func__);
826f3a39 1260
1261 buffer_clear(m);
1262 s = session_new();
1263 if (s == NULL)
1264 goto error;
1265 s->authctxt = authctxt;
1266 s->pw = authctxt->pw;
1267 s->pid = pmonitor->m_pid;
1268 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1269 if (res == 0)
1270 goto error;
1271 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
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
1757 monitor_socketpair(pair);
1758
1759 mon->m_recvfd = pair[0];
1760 mon->m_sendfd = pair[1];
1761
1762 /* Used to share zlib space across processes */
44a053a3 1763 if (options.compression) {
1764 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1765 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
826f3a39 1766
44a053a3 1767 /* Compression needs to share state across borders */
1768 mm_init_compression(mon->m_zlib);
1769 }
826f3a39 1770
1771 return mon;
1772}
1773
1774void
1775monitor_reinit(struct monitor *mon)
1776{
1777 int pair[2];
1778
1779 monitor_socketpair(pair);
1780
1781 mon->m_recvfd = pair[0];
1782 mon->m_sendfd = pair[1];
1783}
b59afbfe 1784
7cac2b65 1785#ifdef GSSAPI
1786int
1787mm_answer_gss_setup_ctx(int socket, Buffer *m)
1788{
1789 gss_OID_desc oid;
1790 OM_uint32 major;
1791 u_int len;
b59afbfe 1792
7cac2b65 1793 oid.elements = buffer_get_string(m, &len);
1794 oid.length = len;
b59afbfe 1795
7cac2b65 1796 major = ssh_gssapi_server_ctx(&gsscontext, &oid);
e23e524c 1797
7cac2b65 1798 xfree(oid.elements);
1799
1800 buffer_clear(m);
1801 buffer_put_int(m, major);
1802
1803 mm_request_send(socket,MONITOR_ANS_GSSSETUP, m);
1804
1805 /* Now we have a context, enable the step */
1806 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1807
1808 return (0);
b59afbfe 1809}
1810
1811int
7cac2b65 1812mm_answer_gss_accept_ctx(int socket, Buffer *m)
1813{
1814 gss_buffer_desc in;
1815 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1816 OM_uint32 major,minor;
1817 OM_uint32 flags = 0; /* GSI needs this */
1818 u_int len;
b59afbfe 1819
7cac2b65 1820 in.value = buffer_get_string(m, &len);
1821 in.length = len;
1822 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1823 xfree(in.value);
b59afbfe 1824
7cac2b65 1825 buffer_clear(m);
1826 buffer_put_int(m, major);
1827 buffer_put_string(m, out.value, out.length);
1828 buffer_put_int(m, flags);
1829 mm_request_send(socket, MONITOR_ANS_GSSSTEP, m);
b59afbfe 1830
7cac2b65 1831 gss_release_buffer(&minor, &out);
b59afbfe 1832
e23e524c 1833 /* Complete - now we can do signing */
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);
e23e524c 1838 }
7cac2b65 1839 return (0);
b59afbfe 1840}
e23e524c 1841
b59afbfe 1842int
7cac2b65 1843mm_answer_gss_userok(int socket, Buffer *m)
1844{
b59afbfe 1845 int authenticated;
1846
7cac2b65 1847 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
b59afbfe 1848
7cac2b65 1849 buffer_clear(m);
1850 buffer_put_int(m, authenticated);
b59afbfe 1851
7cac2b65 1852 debug3("%s: sending result %d", __func__, authenticated);
1853 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
b59afbfe 1854
1855 auth_method="gssapi";
7cac2b65 1856
1857 /* Monitor loop will terminate if authenticated */
1858 return (authenticated);
b59afbfe 1859}
23987cb8 1860
b59afbfe 1861int
1862mm_answer_gss_sign(int socket, Buffer *m) {
1863 gss_buffer_desc data,hash;
1864 OM_uint32 major,minor;
1865
1866 data.value = buffer_get_string(m,&data.length);
1867 if (data.length != 16) { /* HACK - i.e. we are using SSHv1 */
1868 if (data.length != 20)
1869 fatal("%s: data length incorrect: %d", __func__, data.length);
1870
1871 /* Save the session ID - only first time round */
1872 if (session_id2_len == 0) {
1873 session_id2_len=data.length;
1874 session_id2 = xmalloc(session_id2_len);
1875 memcpy(session_id2, data.value, session_id2_len);
1876 }
1877 } /* HACK - end */
1878 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1879
1880 xfree(data.value);
1881
1882 buffer_clear(m);
1883 buffer_put_int(m, major);
1884 buffer_put_string(m, hash.value, hash.length);
1885
1886 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1887
1888 gss_release_buffer(&minor,&hash);
1889
1890 /* Turn on permissions for getpwnam */
1891 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1892
1893 return(0);
1894}
1895
e23e524c 1896int
1897mm_answer_gss_error(int socket, Buffer *m) {
1898 OM_uint32 major,minor;
1899 char *msg;
1900
1901 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
1902 buffer_clear(m);
1903 buffer_put_int(m,major);
1904 buffer_put_int(m,minor);
1905 buffer_put_cstring(m,msg);
1906
1907 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
1908
1909 xfree(msg);
1910
1911 return(0);
1912}
1913
9eeaa28e 1914int
1915mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
1916 OM_uint32 major,minor;
1917 gss_OID_set mech_set;
1918 int i;
1919
1920 major=gss_indicate_mechs(&minor, &mech_set);
1921
1922 buffer_clear(m);
1923 buffer_put_int(m, major);
1924 buffer_put_int(m, mech_set->count);
1925 for (i=0; i < mech_set->count; i++) {
1926 buffer_put_string(m, mech_set->elements[i].elements,
1927 mech_set->elements[i].length);
1928 }
1929
e23e524c 1930#if !defined(MECHGLUE) /* mechglue memory management bug ??? */
1931 gss_release_oid_set(&minor,&mech_set);
1932#endif
1933
9eeaa28e 1934 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
1935
1936 return(0);
1937}
1938
1939int
e23e524c 1940mm_answer_gss_localname(int socket, Buffer *m) {
1941 char *name;
9eeaa28e 1942
e23e524c 1943 ssh_gssapi_localname(&name);
9eeaa28e 1944
e23e524c 1945 buffer_clear(m);
1946 if (name) {
1947 buffer_put_cstring(m, name);
1948 debug3("%s: sending result %s", __func__, name);
1949 xfree(name);
1950 } else {
1951 buffer_put_cstring(m, "");
1952 debug3("%s: sending result \"\"", __func__);
1953 }
1954
1955 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);
9eeaa28e 1956
23987cb8 1957 return(0);
9eeaa28e 1958}
b59afbfe 1959#endif /* GSSAPI */
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