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[gssapi-openssh.git] / openssh / monitor.c
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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"
12a403af 40#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
41#undef TARGET_OS_MAC
826f3a39 42#include "zlib.h"
12a403af 43#define TARGET_OS_MAC 1
44#else
45#include "zlib.h"
46#endif
826f3a39 47#include "packet.h"
48#include "auth-options.h"
49#include "sshpty.h"
50#include "channels.h"
51#include "session.h"
52#include "sshlogin.h"
53#include "canohost.h"
54#include "log.h"
55#include "servconf.h"
56#include "monitor.h"
57#include "monitor_mm.h"
58#include "monitor_wrap.h"
59#include "monitor_fdpass.h"
60#include "xmalloc.h"
61#include "misc.h"
62#include "buffer.h"
63#include "bufaux.h"
64#include "compat.h"
65#include "ssh2.h"
66#include "mpaux.h"
67
b59afbfe 68#ifdef GSSAPI
69#include "ssh-gss.h"
70static Gssctxt *gsscontext = NULL;
71#endif
72
826f3a39 73/* Imports */
74extern ServerOptions options;
75extern u_int utmp_len;
76extern Newkeys *current_keys[];
77extern z_stream incoming_stream;
78extern z_stream outgoing_stream;
79extern u_char session_id[];
80extern Buffer input, output;
81extern Buffer auth_debug;
82extern int auth_debug_init;
83
84/* State exported from the child */
85
86struct {
87 z_stream incoming;
88 z_stream outgoing;
89 u_char *keyin;
90 u_int keyinlen;
91 u_char *keyout;
92 u_int keyoutlen;
93 u_char *ivin;
94 u_int ivinlen;
95 u_char *ivout;
96 u_int ivoutlen;
44a053a3 97 u_char *ssh1key;
98 u_int ssh1keylen;
826f3a39 99 int ssh1cipher;
100 int ssh1protoflags;
101 u_char *input;
102 u_int ilen;
103 u_char *output;
104 u_int olen;
105} child_state;
106
7cac2b65 107/* Functions on the monitor that answer unprivileged requests */
826f3a39 108
109int mm_answer_moduli(int, Buffer *);
110int mm_answer_sign(int, Buffer *);
111int mm_answer_pwnamallow(int, Buffer *);
112int mm_answer_auth2_read_banner(int, Buffer *);
113int mm_answer_authserv(int, Buffer *);
114int mm_answer_authpassword(int, Buffer *);
115int mm_answer_bsdauthquery(int, Buffer *);
116int mm_answer_bsdauthrespond(int, Buffer *);
117int mm_answer_skeyquery(int, Buffer *);
118int mm_answer_skeyrespond(int, Buffer *);
119int mm_answer_keyallowed(int, Buffer *);
120int mm_answer_keyverify(int, Buffer *);
121int mm_answer_pty(int, Buffer *);
122int mm_answer_pty_cleanup(int, Buffer *);
123int mm_answer_term(int, Buffer *);
124int mm_answer_rsa_keyallowed(int, Buffer *);
125int mm_answer_rsa_challenge(int, Buffer *);
126int mm_answer_rsa_response(int, Buffer *);
127int mm_answer_sesskey(int, Buffer *);
128int mm_answer_sessid(int, Buffer *);
129
130#ifdef USE_PAM
131int mm_answer_pam_start(int, Buffer *);
7cac2b65 132int mm_answer_pam_account(int, Buffer *);
133int mm_answer_pam_init_ctx(int, Buffer *);
134int mm_answer_pam_query(int, Buffer *);
135int mm_answer_pam_respond(int, Buffer *);
136int mm_answer_pam_free_ctx(int, Buffer *);
826f3a39 137#endif
138
7cac2b65 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 *);
540d72c3 143int mm_answer_gss_checkmic(int, Buffer *);
23987cb8 144#endif
145
b59afbfe 146#ifdef GSSAPI
147int mm_answer_gss_setup_ctx(int, Buffer *);
148int mm_answer_gss_accept_ctx(int, Buffer *);
149int mm_answer_gss_userok(int, Buffer *);
b59afbfe 150int mm_answer_gss_sign(int, Buffer *);
23987cb8 151int mm_answer_gss_error(int, Buffer *);
e23e524c 152int mm_answer_gss_indicate_mechs(int, Buffer *);
153int mm_answer_gss_localname(int, Buffer *);
b59afbfe 154#endif
155
826f3a39 156static Authctxt *authctxt;
157static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
158
159/* local state for key verify */
160static u_char *key_blob = NULL;
161static u_int key_bloblen = 0;
162static int key_blobtype = MM_NOKEY;
d03f4262 163static char *hostbased_cuser = NULL;
164static char *hostbased_chost = NULL;
826f3a39 165static char *auth_method = "unknown";
7cac2b65 166static u_int session_id2_len = 0;
44a053a3 167static u_char *session_id2 = NULL;
7cac2b65 168static pid_t monitor_child_pid;
826f3a39 169
170struct mon_table {
171 enum monitor_reqtype type;
172 int flags;
173 int (*f)(int, Buffer *);
174};
175
176#define MON_ISAUTH 0x0004 /* Required for Authentication */
177#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
178#define MON_ONCE 0x0010 /* Disable after calling */
179
180#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
181
182#define MON_PERMIT 0x1000 /* Request is permitted */
183
184struct mon_table mon_dispatch_proto20[] = {
185 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
186 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
b59afbfe 187 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
826f3a39 188 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
189 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
190 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
191#ifdef USE_PAM
e2447520 192 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
7cac2b65 193 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
194 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
195 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
196 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
197 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
826f3a39 198#endif
199#ifdef BSD_AUTH
200 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
201 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
202#endif
203#ifdef SKEY
204 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
205 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
b59afbfe 206#endif
7cac2b65 207 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
208 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
b59afbfe 209#ifdef GSSAPI
210 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
211 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
7cac2b65 212 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
b59afbfe 213 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
e23e524c 214 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
9eeaa28e 215 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
e23e524c 216 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
540d72c3 217 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
826f3a39 218#endif
826f3a39 219 {0, 0, NULL}
220};
221
222struct mon_table mon_dispatch_postauth20[] = {
b59afbfe 223#ifdef GSSAPI
224 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
225 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
226 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
23987cb8 227 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
e23e524c 228 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
b59afbfe 229#endif
826f3a39 230 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
231 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
232 {MONITOR_REQ_PTY, 0, mm_answer_pty},
233 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
234 {MONITOR_REQ_TERM, 0, mm_answer_term},
235 {0, 0, NULL}
236};
237
238struct mon_table mon_dispatch_proto15[] = {
239 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
240 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
241 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
242 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
243 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
244 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
245 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
246 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
826f3a39 247#ifdef BSD_AUTH
248 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
249 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
250#endif
251#ifdef SKEY
252 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
253 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
254#endif
b59afbfe 255#ifdef GSSAPI
256 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
257 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
258 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
259 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
9eeaa28e 260 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
b59afbfe 261#endif
826f3a39 262#ifdef USE_PAM
e2447520 263 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
7cac2b65 264 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
265 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
266 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
267 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
268 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
826f3a39 269#endif
270 {0, 0, NULL}
271};
272
273struct mon_table mon_dispatch_postauth15[] = {
274 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
275 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
276 {MONITOR_REQ_TERM, 0, mm_answer_term},
277 {0, 0, NULL}
278};
279
280struct mon_table *mon_dispatch;
281
282/* Specifies if a certain message is allowed at the moment */
283
284static void
285monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
286{
287 while (ent->f != NULL) {
288 if (ent->type == type) {
289 ent->flags &= ~MON_PERMIT;
290 ent->flags |= permit ? MON_PERMIT : 0;
291 return;
292 }
293 ent++;
294 }
295}
296
297static void
298monitor_permit_authentications(int permit)
299{
300 struct mon_table *ent = mon_dispatch;
301
302 while (ent->f != NULL) {
303 if (ent->flags & MON_AUTH) {
304 ent->flags &= ~MON_PERMIT;
305 ent->flags |= permit ? MON_PERMIT : 0;
306 }
307 ent++;
308 }
309}
310
540d72c3 311void
312monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
826f3a39 313{
314 struct mon_table *ent;
315 int authenticated = 0;
316
317 debug3("preauth child monitor started");
318
540d72c3 319 authctxt = _authctxt;
320 memset(authctxt, 0, sizeof(*authctxt));
321
826f3a39 322 if (compat20) {
323 mon_dispatch = mon_dispatch_proto20;
324
325 /* Permit requests for moduli and signatures */
326 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
327 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
b59afbfe 328#ifdef GSSAPI
329 /* and for the GSSAPI key exchange */
330 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
23987cb8 331 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
e23e524c 332 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
b59afbfe 333#endif
826f3a39 334 } else {
335 mon_dispatch = mon_dispatch_proto15;
336
337 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
338 }
339
826f3a39 340 /* The first few requests do not require asynchronous access */
341 while (!authenticated) {
342 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
343 if (authenticated) {
344 if (!(ent->flags & MON_AUTHDECIDE))
345 fatal("%s: unexpected authentication from %d",
44a053a3 346 __func__, ent->type);
826f3a39 347 if (authctxt->pw->pw_uid == 0 &&
348 !auth_root_allowed(auth_method))
349 authenticated = 0;
350#ifdef USE_PAM
7cac2b65 351 /* PAM needs to perform account checks after auth */
540d72c3 352 if (options.use_pam && authenticated) {
7cac2b65 353 Buffer m;
354
355 buffer_init(&m);
540d72c3 356 mm_request_receive_expect(pmonitor->m_sendfd,
7cac2b65 357 MONITOR_REQ_PAM_ACCOUNT, &m);
358 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
359 buffer_free(&m);
360 }
826f3a39 361#endif
362 }
363
364 if (ent->flags & MON_AUTHDECIDE) {
365 auth_log(authctxt, authenticated, auth_method,
366 compat20 ? " ssh2" : "");
367 if (!authenticated)
368 authctxt->failures++;
369 }
370 }
371
372 if (!authctxt->valid)
44a053a3 373 fatal("%s: authenticated invalid user", __func__);
826f3a39 374
375 debug("%s: %s has been authenticated by privileged process",
44a053a3 376 __func__, authctxt->user);
826f3a39 377
378 mm_get_keystate(pmonitor);
826f3a39 379}
380
7cac2b65 381static void
382monitor_set_child_handler(pid_t pid)
383{
384 monitor_child_pid = pid;
385}
386
387static void
388monitor_child_handler(int signal)
389{
390 kill(monitor_child_pid, signal);
391}
392
826f3a39 393void
394monitor_child_postauth(struct monitor *pmonitor)
395{
7cac2b65 396 monitor_set_child_handler(pmonitor->m_pid);
397 signal(SIGHUP, &monitor_child_handler);
398 signal(SIGTERM, &monitor_child_handler);
399
826f3a39 400 if (compat20) {
401 mon_dispatch = mon_dispatch_postauth20;
402
403 /* Permit requests for moduli and signatures */
404 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
405 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
406 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
407
e23e524c 408#ifdef GSSAPI
409 /* and for the GSSAPI key exchange */
410 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
411 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
412 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
413#endif
414
826f3a39 415 } else {
416 mon_dispatch = mon_dispatch_postauth15;
417 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
418 }
9eeaa28e 419#ifdef GSSAPI
23987cb8 420 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
9eeaa28e 421#endif
826f3a39 422 if (!no_pty_flag) {
423 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
424 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
425 }
426
427 for (;;)
428 monitor_read(pmonitor, mon_dispatch, NULL);
429}
430
431void
432monitor_sync(struct monitor *pmonitor)
433{
44a053a3 434 if (options.compression) {
435 /* The member allocation is not visible, so sync it */
436 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
437 }
826f3a39 438}
439
440int
441monitor_read(struct monitor *pmonitor, struct mon_table *ent,
442 struct mon_table **pent)
443{
444 Buffer m;
445 int ret;
446 u_char type;
447
448 buffer_init(&m);
449
450 mm_request_receive(pmonitor->m_sendfd, &m);
451 type = buffer_get_char(&m);
452
44a053a3 453 debug3("%s: checking request %d", __func__, type);
826f3a39 454
455 while (ent->f != NULL) {
456 if (ent->type == type)
457 break;
458 ent++;
459 }
460
461 if (ent->f != NULL) {
462 if (!(ent->flags & MON_PERMIT))
44a053a3 463 fatal("%s: unpermitted request %d", __func__,
826f3a39 464 type);
465 ret = (*ent->f)(pmonitor->m_sendfd, &m);
466 buffer_free(&m);
467
468 /* The child may use this request only once, disable it */
469 if (ent->flags & MON_ONCE) {
44a053a3 470 debug2("%s: %d used once, disabling now", __func__,
826f3a39 471 type);
472 ent->flags &= ~MON_PERMIT;
473 }
474
475 if (pent != NULL)
476 *pent = ent;
477
478 return ret;
479 }
480
44a053a3 481 fatal("%s: unsupported request: %d", __func__, type);
826f3a39 482
483 /* NOTREACHED */
484 return (-1);
485}
486
487/* allowed key state */
488static int
489monitor_allowed_key(u_char *blob, u_int bloblen)
490{
491 /* make sure key is allowed */
492 if (key_blob == NULL || key_bloblen != bloblen ||
493 memcmp(key_blob, blob, key_bloblen))
494 return (0);
495 return (1);
496}
497
498static void
499monitor_reset_key_state(void)
500{
501 /* reset state */
502 if (key_blob != NULL)
503 xfree(key_blob);
504 if (hostbased_cuser != NULL)
505 xfree(hostbased_cuser);
506 if (hostbased_chost != NULL)
507 xfree(hostbased_chost);
508 key_blob = NULL;
509 key_bloblen = 0;
510 key_blobtype = MM_NOKEY;
511 hostbased_cuser = NULL;
512 hostbased_chost = NULL;
513}
514
515int
516mm_answer_moduli(int socket, Buffer *m)
517{
518 DH *dh;
519 int min, want, max;
520
521 min = buffer_get_int(m);
522 want = buffer_get_int(m);
523 max = buffer_get_int(m);
524
525 debug3("%s: got parameters: %d %d %d",
44a053a3 526 __func__, min, want, max);
826f3a39 527 /* We need to check here, too, in case the child got corrupted */
528 if (max < min || want < min || max < want)
529 fatal("%s: bad parameters: %d %d %d",
44a053a3 530 __func__, min, want, max);
826f3a39 531
532 buffer_clear(m);
533
534 dh = choose_dh(min, want, max);
535 if (dh == NULL) {
536 buffer_put_char(m, 0);
537 return (0);
538 } else {
539 /* Send first bignum */
540 buffer_put_char(m, 1);
541 buffer_put_bignum2(m, dh->p);
542 buffer_put_bignum2(m, dh->g);
543
544 DH_free(dh);
545 }
546 mm_request_send(socket, MONITOR_ANS_MODULI, m);
547 return (0);
548}
549
550int
551mm_answer_sign(int socket, Buffer *m)
552{
553 Key *key;
554 u_char *p;
555 u_char *signature;
556 u_int siglen, datlen;
557 int keyid;
558
44a053a3 559 debug3("%s", __func__);
826f3a39 560
561 keyid = buffer_get_int(m);
562 p = buffer_get_string(m, &datlen);
563
564 if (datlen != 20)
d03f4262 565 fatal("%s: data length incorrect: %u", __func__, datlen);
44a053a3 566
567 /* save session id, it will be passed on the first call */
568 if (session_id2_len == 0) {
569 session_id2_len = datlen;
570 session_id2 = xmalloc(session_id2_len);
571 memcpy(session_id2, p, session_id2_len);
572 }
826f3a39 573
574 if ((key = get_hostkey_by_index(keyid)) == NULL)
44a053a3 575 fatal("%s: no hostkey from index %d", __func__, keyid);
826f3a39 576 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
44a053a3 577 fatal("%s: key_sign failed", __func__);
826f3a39 578
d03f4262 579 debug3("%s: signature %p(%u)", __func__, signature, siglen);
826f3a39 580
581 buffer_clear(m);
582 buffer_put_string(m, signature, siglen);
583
584 xfree(p);
585 xfree(signature);
586
587 mm_request_send(socket, MONITOR_ANS_SIGN, m);
588
589 /* Turn on permissions for getpwnam */
590 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
591
592 return (0);
593}
594
595/* Retrieves the password entry and also checks if the user is permitted */
596
597int
598mm_answer_pwnamallow(int socket, Buffer *m)
599{
600 char *login;
601 struct passwd *pwent;
602 int allowed = 0;
603
44a053a3 604 debug3("%s", __func__);
826f3a39 605
826f3a39 606 login = buffer_get_string(m, NULL);
607
608 pwent = getpwnamallow(login);
609
b59afbfe 610 if (authctxt->user) xfree(authctxt->user);
826f3a39 611 authctxt->user = xstrdup(login);
612 setproctitle("%s [priv]", pwent ? login : "unknown");
613 xfree(login);
614
615 buffer_clear(m);
616
617 if (pwent == NULL) {
618 buffer_put_char(m, 0);
540d72c3 619 authctxt->pw = fakepw();
826f3a39 620 goto out;
621 }
622
623 allowed = 1;
624 authctxt->pw = pwent;
625 authctxt->valid = 1;
626
627 buffer_put_char(m, 1);
628 buffer_put_string(m, pwent, sizeof(struct passwd));
629 buffer_put_cstring(m, pwent->pw_name);
630 buffer_put_cstring(m, "*");
631 buffer_put_cstring(m, pwent->pw_gecos);
632#ifdef HAVE_PW_CLASS_IN_PASSWD
633 buffer_put_cstring(m, pwent->pw_class);
634#endif
635 buffer_put_cstring(m, pwent->pw_dir);
636 buffer_put_cstring(m, pwent->pw_shell);
637
638 out:
44a053a3 639 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
826f3a39 640 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
641
642 /* For SSHv1 allow authentication now */
643 if (!compat20)
644 monitor_permit_authentications(1);
645 else {
646 /* Allow service/style information on the auth context */
647 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
648 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
649 }
650
651#ifdef USE_PAM
7cac2b65 652 if (options.use_pam)
653 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
826f3a39 654#endif
655
656 return (0);
657}
658
659int mm_answer_auth2_read_banner(int socket, Buffer *m)
660{
661 char *banner;
662
663 buffer_clear(m);
664 banner = auth2_read_banner();
665 buffer_put_cstring(m, banner != NULL ? banner : "");
666 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
667
668 if (banner != NULL)
d03f4262 669 xfree(banner);
826f3a39 670
671 return (0);
672}
673
674int
675mm_answer_authserv(int socket, Buffer *m)
676{
677 monitor_permit_authentications(1);
678
679 authctxt->service = buffer_get_string(m, NULL);
680 authctxt->style = buffer_get_string(m, NULL);
681 debug3("%s: service=%s, style=%s",
44a053a3 682 __func__, authctxt->service, authctxt->style);
826f3a39 683
684 if (strlen(authctxt->style) == 0) {
685 xfree(authctxt->style);
686 authctxt->style = NULL;
687 }
688
689 return (0);
690}
691
692int
693mm_answer_authpassword(int socket, Buffer *m)
694{
695 static int call_count;
696 char *passwd;
d03f4262 697 int authenticated;
698 u_int plen;
826f3a39 699
700 passwd = buffer_get_string(m, &plen);
701 /* Only authenticate if the context is valid */
44a053a3 702 authenticated = options.password_authentication &&
7cac2b65 703 auth_password(authctxt, passwd);
826f3a39 704 memset(passwd, 0, strlen(passwd));
705 xfree(passwd);
706
707 buffer_clear(m);
708 buffer_put_int(m, authenticated);
709
44a053a3 710 debug3("%s: sending result %d", __func__, authenticated);
826f3a39 711 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
712
713 call_count++;
714 if (plen == 0 && call_count == 1)
715 auth_method = "none";
716 else
717 auth_method = "password";
718
719 /* Causes monitor loop to terminate if authenticated */
720 return (authenticated);
721}
722
723#ifdef BSD_AUTH
724int
725mm_answer_bsdauthquery(int socket, Buffer *m)
726{
727 char *name, *infotxt;
728 u_int numprompts;
729 u_int *echo_on;
730 char **prompts;
bfe49944 731 u_int success;
826f3a39 732
bfe49944 733 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
734 &prompts, &echo_on) < 0 ? 0 : 1;
826f3a39 735
736 buffer_clear(m);
bfe49944 737 buffer_put_int(m, success);
738 if (success)
826f3a39 739 buffer_put_cstring(m, prompts[0]);
740
bfe49944 741 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 742 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
743
bfe49944 744 if (success) {
826f3a39 745 xfree(name);
746 xfree(infotxt);
747 xfree(prompts);
748 xfree(echo_on);
749 }
750
751 return (0);
752}
753
754int
755mm_answer_bsdauthrespond(int socket, Buffer *m)
756{
757 char *response;
758 int authok;
759
760 if (authctxt->as == 0)
44a053a3 761 fatal("%s: no bsd auth session", __func__);
826f3a39 762
763 response = buffer_get_string(m, NULL);
44a053a3 764 authok = options.challenge_response_authentication &&
765 auth_userresponse(authctxt->as, response, 0);
826f3a39 766 authctxt->as = NULL;
44a053a3 767 debug3("%s: <%s> = <%d>", __func__, response, authok);
826f3a39 768 xfree(response);
769
770 buffer_clear(m);
771 buffer_put_int(m, authok);
772
44a053a3 773 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 774 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
775
776 auth_method = "bsdauth";
777
778 return (authok != 0);
779}
780#endif
781
782#ifdef SKEY
783int
784mm_answer_skeyquery(int socket, Buffer *m)
785{
786 struct skey skey;
787 char challenge[1024];
bfe49944 788 u_int success;
826f3a39 789
12a403af 790 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
791 sizeof(challenge)) < 0 ? 0 : 1;
826f3a39 792
793 buffer_clear(m);
bfe49944 794 buffer_put_int(m, success);
795 if (success)
826f3a39 796 buffer_put_cstring(m, challenge);
797
bfe49944 798 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 799 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
800
801 return (0);
802}
803
804int
805mm_answer_skeyrespond(int socket, Buffer *m)
806{
807 char *response;
808 int authok;
809
810 response = buffer_get_string(m, NULL);
811
44a053a3 812 authok = (options.challenge_response_authentication &&
813 authctxt->valid &&
826f3a39 814 skey_haskey(authctxt->pw->pw_name) == 0 &&
815 skey_passcheck(authctxt->pw->pw_name, response) != -1);
816
817 xfree(response);
818
819 buffer_clear(m);
820 buffer_put_int(m, authok);
821
44a053a3 822 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 823 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
824
825 auth_method = "skey";
826
827 return (authok != 0);
828}
829#endif
830
831#ifdef USE_PAM
832int
833mm_answer_pam_start(int socket, Buffer *m)
834{
7cac2b65 835 if (!options.use_pam)
836 fatal("UsePAM not set, but ended up in %s anyway", __func__);
837
12a403af 838 start_pam(authctxt);
826f3a39 839
7cac2b65 840 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
841
826f3a39 842 return (0);
843}
7cac2b65 844
845int
846mm_answer_pam_account(int socket, Buffer *m)
847{
848 u_int ret;
540d72c3 849
7cac2b65 850 if (!options.use_pam)
851 fatal("UsePAM not set, but ended up in %s anyway", __func__);
852
853 ret = do_pam_account();
854
855 buffer_put_int(m, ret);
856
857 mm_request_send(socket, MONITOR_ANS_PAM_ACCOUNT, m);
858
859 return (ret);
860}
861
862static void *sshpam_ctxt, *sshpam_authok;
863extern KbdintDevice sshpam_device;
864
865int
866mm_answer_pam_init_ctx(int socket, Buffer *m)
867{
868
869 debug3("%s", __func__);
870 authctxt->user = buffer_get_string(m, NULL);
871 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
872 sshpam_authok = NULL;
873 buffer_clear(m);
874 if (sshpam_ctxt != NULL) {
875 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
876 buffer_put_int(m, 1);
877 } else {
878 buffer_put_int(m, 0);
879 }
880 mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m);
881 return (0);
882}
883
884int
885mm_answer_pam_query(int socket, Buffer *m)
886{
887 char *name, *info, **prompts;
888 u_int num, *echo_on;
889 int i, ret;
890
891 debug3("%s", __func__);
892 sshpam_authok = NULL;
893 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
894 if (ret == 0 && num == 0)
895 sshpam_authok = sshpam_ctxt;
896 if (num > 1 || name == NULL || info == NULL)
897 ret = -1;
898 buffer_clear(m);
899 buffer_put_int(m, ret);
900 buffer_put_cstring(m, name);
901 xfree(name);
902 buffer_put_cstring(m, info);
903 xfree(info);
904 buffer_put_int(m, num);
905 for (i = 0; i < num; ++i) {
906 buffer_put_cstring(m, prompts[i]);
907 xfree(prompts[i]);
908 buffer_put_int(m, echo_on[i]);
909 }
910 if (prompts != NULL)
911 xfree(prompts);
912 if (echo_on != NULL)
913 xfree(echo_on);
914 mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m);
915 return (0);
916}
917
918int
919mm_answer_pam_respond(int socket, Buffer *m)
920{
921 char **resp;
922 u_int num;
923 int i, ret;
924
925 debug3("%s", __func__);
926 sshpam_authok = NULL;
927 num = buffer_get_int(m);
928 if (num > 0) {
929 resp = xmalloc(num * sizeof(char *));
930 for (i = 0; i < num; ++i)
931 resp[i] = buffer_get_string(m, NULL);
932 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
933 for (i = 0; i < num; ++i)
934 xfree(resp[i]);
935 xfree(resp);
936 } else {
937 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
938 }
939 buffer_clear(m);
940 buffer_put_int(m, ret);
941 mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m);
942 auth_method = "keyboard-interactive/pam";
943 if (ret == 0)
944 sshpam_authok = sshpam_ctxt;
945 return (0);
946}
947
948int
949mm_answer_pam_free_ctx(int socket, Buffer *m)
950{
951
952 debug3("%s", __func__);
953 (sshpam_device.free_ctx)(sshpam_ctxt);
954 buffer_clear(m);
955 mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m);
956 return (sshpam_authok == sshpam_ctxt);
957}
826f3a39 958#endif
959
960static void
961mm_append_debug(Buffer *m)
962{
963 if (auth_debug_init && buffer_len(&auth_debug)) {
44a053a3 964 debug3("%s: Appending debug messages for child", __func__);
826f3a39 965 buffer_append(m, buffer_ptr(&auth_debug),
966 buffer_len(&auth_debug));
967 buffer_clear(&auth_debug);
968 }
969}
970
971int
972mm_answer_keyallowed(int socket, Buffer *m)
973{
974 Key *key;
d03f4262 975 char *cuser, *chost;
976 u_char *blob;
826f3a39 977 u_int bloblen;
978 enum mm_keytype type = 0;
979 int allowed = 0;
980
44a053a3 981 debug3("%s entering", __func__);
826f3a39 982
983 type = buffer_get_int(m);
984 cuser = buffer_get_string(m, NULL);
985 chost = buffer_get_string(m, NULL);
986 blob = buffer_get_string(m, &bloblen);
987
988 key = key_from_blob(blob, bloblen);
989
990 if ((compat20 && type == MM_RSAHOSTKEY) ||
991 (!compat20 && type != MM_RSAHOSTKEY))
44a053a3 992 fatal("%s: key type and protocol mismatch", __func__);
826f3a39 993
44a053a3 994 debug3("%s: key_from_blob: %p", __func__, key);
826f3a39 995
540d72c3 996 if (key != NULL && authctxt->valid) {
826f3a39 997 switch(type) {
998 case MM_USERKEY:
44a053a3 999 allowed = options.pubkey_authentication &&
1000 user_key_allowed(authctxt->pw, key);
826f3a39 1001 break;
1002 case MM_HOSTKEY:
44a053a3 1003 allowed = options.hostbased_authentication &&
1004 hostbased_key_allowed(authctxt->pw,
826f3a39 1005 cuser, chost, key);
1006 break;
1007 case MM_RSAHOSTKEY:
1008 key->type = KEY_RSA1; /* XXX */
44a053a3 1009 allowed = options.rhosts_rsa_authentication &&
1010 auth_rhosts_rsa_key_allowed(authctxt->pw,
826f3a39 1011 cuser, chost, key);
1012 break;
1013 default:
44a053a3 1014 fatal("%s: unknown key type %d", __func__, type);
826f3a39 1015 break;
1016 }
826f3a39 1017 }
bfe49944 1018 if (key != NULL)
1019 key_free(key);
826f3a39 1020
1021 /* clear temporarily storage (used by verify) */
1022 monitor_reset_key_state();
1023
1024 if (allowed) {
1025 /* Save temporarily for comparison in verify */
1026 key_blob = blob;
1027 key_bloblen = bloblen;
1028 key_blobtype = type;
1029 hostbased_cuser = cuser;
1030 hostbased_chost = chost;
1031 }
1032
1033 debug3("%s: key %p is %s",
44a053a3 1034 __func__, key, allowed ? "allowed" : "disallowed");
826f3a39 1035
1036 buffer_clear(m);
1037 buffer_put_int(m, allowed);
bfe49944 1038 buffer_put_int(m, forced_command != NULL);
826f3a39 1039
1040 mm_append_debug(m);
1041
1042 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
1043
1044 if (type == MM_RSAHOSTKEY)
1045 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1046
1047 return (0);
1048}
1049
1050static int
1051monitor_valid_userblob(u_char *data, u_int datalen)
1052{
1053 Buffer b;
d03f4262 1054 char *p;
826f3a39 1055 u_int len;
1056 int fail = 0;
826f3a39 1057
1058 buffer_init(&b);
1059 buffer_append(&b, data, datalen);
1060
1061 if (datafellows & SSH_OLD_SESSIONID) {
44a053a3 1062 p = buffer_ptr(&b);
1063 len = buffer_len(&b);
1064 if ((session_id2 == NULL) ||
1065 (len < session_id2_len) ||
1066 (memcmp(p, session_id2, session_id2_len) != 0))
1067 fail++;
826f3a39 1068 buffer_consume(&b, session_id2_len);
1069 } else {
44a053a3 1070 p = buffer_get_string(&b, &len);
1071 if ((session_id2 == NULL) ||
1072 (len != session_id2_len) ||
1073 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 1074 fail++;
44a053a3 1075 xfree(p);
826f3a39 1076 }
1077 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1078 fail++;
1079 p = buffer_get_string(&b, NULL);
1080 if (strcmp(authctxt->user, p) != 0) {
7cac2b65 1081 logit("wrong user name passed to monitor: expected %s != %.100s",
826f3a39 1082 authctxt->user, p);
1083 fail++;
1084 }
1085 xfree(p);
1086 buffer_skip_string(&b);
1087 if (datafellows & SSH_BUG_PKAUTH) {
1088 if (!buffer_get_char(&b))
1089 fail++;
1090 } else {
1091 p = buffer_get_string(&b, NULL);
1092 if (strcmp("publickey", p) != 0)
1093 fail++;
1094 xfree(p);
1095 if (!buffer_get_char(&b))
1096 fail++;
1097 buffer_skip_string(&b);
1098 }
1099 buffer_skip_string(&b);
1100 if (buffer_len(&b) != 0)
1101 fail++;
1102 buffer_free(&b);
1103 return (fail == 0);
1104}
1105
1106static int
d03f4262 1107monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1108 char *chost)
826f3a39 1109{
1110 Buffer b;
d03f4262 1111 char *p;
826f3a39 1112 u_int len;
1113 int fail = 0;
826f3a39 1114
1115 buffer_init(&b);
1116 buffer_append(&b, data, datalen);
1117
44a053a3 1118 p = buffer_get_string(&b, &len);
1119 if ((session_id2 == NULL) ||
1120 (len != session_id2_len) ||
1121 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 1122 fail++;
44a053a3 1123 xfree(p);
1124
826f3a39 1125 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1126 fail++;
1127 p = buffer_get_string(&b, NULL);
1128 if (strcmp(authctxt->user, p) != 0) {
7cac2b65 1129 logit("wrong user name passed to monitor: expected %s != %.100s",
826f3a39 1130 authctxt->user, p);
1131 fail++;
1132 }
1133 xfree(p);
1134 buffer_skip_string(&b); /* service */
1135 p = buffer_get_string(&b, NULL);
1136 if (strcmp(p, "hostbased") != 0)
1137 fail++;
1138 xfree(p);
1139 buffer_skip_string(&b); /* pkalg */
1140 buffer_skip_string(&b); /* pkblob */
1141
1142 /* verify client host, strip trailing dot if necessary */
1143 p = buffer_get_string(&b, NULL);
1144 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1145 p[len - 1] = '\0';
1146 if (strcmp(p, chost) != 0)
1147 fail++;
1148 xfree(p);
1149
1150 /* verify client user */
1151 p = buffer_get_string(&b, NULL);
1152 if (strcmp(p, cuser) != 0)
1153 fail++;
1154 xfree(p);
1155
1156 if (buffer_len(&b) != 0)
1157 fail++;
1158 buffer_free(&b);
1159 return (fail == 0);
1160}
1161
1162int
1163mm_answer_keyverify(int socket, Buffer *m)
1164{
1165 Key *key;
1166 u_char *signature, *data, *blob;
1167 u_int signaturelen, datalen, bloblen;
1168 int verified = 0;
1169 int valid_data = 0;
1170
1171 blob = buffer_get_string(m, &bloblen);
1172 signature = buffer_get_string(m, &signaturelen);
1173 data = buffer_get_string(m, &datalen);
1174
1175 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1176 !monitor_allowed_key(blob, bloblen))
44a053a3 1177 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1178
1179 key = key_from_blob(blob, bloblen);
1180 if (key == NULL)
44a053a3 1181 fatal("%s: bad public key blob", __func__);
826f3a39 1182
1183 switch (key_blobtype) {
1184 case MM_USERKEY:
1185 valid_data = monitor_valid_userblob(data, datalen);
1186 break;
1187 case MM_HOSTKEY:
1188 valid_data = monitor_valid_hostbasedblob(data, datalen,
1189 hostbased_cuser, hostbased_chost);
1190 break;
1191 default:
1192 valid_data = 0;
1193 break;
1194 }
1195 if (!valid_data)
44a053a3 1196 fatal("%s: bad signature data blob", __func__);
826f3a39 1197
1198 verified = key_verify(key, signature, signaturelen, data, datalen);
1199 debug3("%s: key %p signature %s",
44a053a3 1200 __func__, key, verified ? "verified" : "unverified");
826f3a39 1201
1202 key_free(key);
1203 xfree(blob);
1204 xfree(signature);
1205 xfree(data);
1206
276b07a3 1207 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1208
826f3a39 1209 monitor_reset_key_state();
1210
1211 buffer_clear(m);
1212 buffer_put_int(m, verified);
1213 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1214
826f3a39 1215 return (verified);
1216}
1217
1218static void
1219mm_record_login(Session *s, struct passwd *pw)
1220{
1221 socklen_t fromlen;
1222 struct sockaddr_storage from;
1223
1224 /*
1225 * Get IP address of client. If the connection is not a socket, let
1226 * the address be 0.0.0.0.
1227 */
1228 memset(&from, 0, sizeof(from));
d03f4262 1229 fromlen = sizeof(from);
826f3a39 1230 if (packet_connection_is_on_socket()) {
826f3a39 1231 if (getpeername(packet_get_connection_in(),
1232 (struct sockaddr *) & from, &fromlen) < 0) {
1233 debug("getpeername: %.100s", strerror(errno));
540d72c3 1234 cleanup_exit(255);
826f3a39 1235 }
1236 }
1237 /* Record that there was a login on that tty from the remote host. */
1238 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
7cac2b65 1239 get_remote_name_or_ip(utmp_len, options.use_dns),
d03f4262 1240 (struct sockaddr *)&from, fromlen);
826f3a39 1241}
1242
1243static void
1244mm_session_close(Session *s)
1245{
7cac2b65 1246 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
826f3a39 1247 if (s->ttyfd != -1) {
44a053a3 1248 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
826f3a39 1249 session_pty_cleanup2(s);
1250 }
1251 s->used = 0;
1252}
1253
1254int
1255mm_answer_pty(int socket, Buffer *m)
1256{
1257 extern struct monitor *pmonitor;
1258 Session *s;
1259 int res, fd0;
1260
44a053a3 1261 debug3("%s entering", __func__);
826f3a39 1262
1263 buffer_clear(m);
1264 s = session_new();
1265 if (s == NULL)
1266 goto error;
1267 s->authctxt = authctxt;
1268 s->pw = authctxt->pw;
1269 s->pid = pmonitor->m_pid;
1270 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1271 if (res == 0)
1272 goto error;
826f3a39 1273 pty_setowner(authctxt->pw, s->tty);
1274
1275 buffer_put_int(m, 1);
1276 buffer_put_cstring(m, s->tty);
1277 mm_request_send(socket, MONITOR_ANS_PTY, m);
1278
1279 mm_send_fd(socket, s->ptyfd);
1280 mm_send_fd(socket, s->ttyfd);
1281
1282 /* We need to trick ttyslot */
1283 if (dup2(s->ttyfd, 0) == -1)
44a053a3 1284 fatal("%s: dup2", __func__);
826f3a39 1285
1286 mm_record_login(s, authctxt->pw);
1287
1288 /* Now we can close the file descriptor again */
1289 close(0);
1290
1291 /* make sure nothing uses fd 0 */
1292 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
44a053a3 1293 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
826f3a39 1294 if (fd0 != 0)
44a053a3 1295 error("%s: fd0 %d != 0", __func__, fd0);
826f3a39 1296
1297 /* slave is not needed */
1298 close(s->ttyfd);
1299 s->ttyfd = s->ptyfd;
1300 /* no need to dup() because nobody closes ptyfd */
1301 s->ptymaster = s->ptyfd;
1302
44a053a3 1303 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
826f3a39 1304
1305 return (0);
1306
1307 error:
1308 if (s != NULL)
1309 mm_session_close(s);
1310 buffer_put_int(m, 0);
1311 mm_request_send(socket, MONITOR_ANS_PTY, m);
1312 return (0);
1313}
1314
1315int
1316mm_answer_pty_cleanup(int socket, Buffer *m)
1317{
1318 Session *s;
1319 char *tty;
1320
44a053a3 1321 debug3("%s entering", __func__);
826f3a39 1322
1323 tty = buffer_get_string(m, NULL);
1324 if ((s = session_by_tty(tty)) != NULL)
1325 mm_session_close(s);
1326 buffer_clear(m);
1327 xfree(tty);
1328 return (0);
1329}
1330
1331int
1332mm_answer_sesskey(int socket, Buffer *m)
1333{
1334 BIGNUM *p;
1335 int rsafail;
1336
1337 /* Turn off permissions */
1338 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1339
1340 if ((p = BN_new()) == NULL)
44a053a3 1341 fatal("%s: BN_new", __func__);
826f3a39 1342
1343 buffer_get_bignum2(m, p);
1344
1345 rsafail = ssh1_session_key(p);
1346
1347 buffer_clear(m);
1348 buffer_put_int(m, rsafail);
1349 buffer_put_bignum2(m, p);
1350
1351 BN_clear_free(p);
1352
1353 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1354
1355 /* Turn on permissions for sessid passing */
1356 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1357
1358 return (0);
1359}
1360
1361int
1362mm_answer_sessid(int socket, Buffer *m)
1363{
1364 int i;
1365
44a053a3 1366 debug3("%s entering", __func__);
826f3a39 1367
1368 if (buffer_len(m) != 16)
44a053a3 1369 fatal("%s: bad ssh1 session id", __func__);
826f3a39 1370 for (i = 0; i < 16; i++)
1371 session_id[i] = buffer_get_char(m);
1372
1373 /* Turn on permissions for getpwnam */
1374 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1375
1376 return (0);
1377}
1378
1379int
1380mm_answer_rsa_keyallowed(int socket, Buffer *m)
1381{
1382 BIGNUM *client_n;
1383 Key *key = NULL;
1384 u_char *blob = NULL;
1385 u_int blen = 0;
1386 int allowed = 0;
1387
44a053a3 1388 debug3("%s entering", __func__);
826f3a39 1389
44a053a3 1390 if (options.rsa_authentication && authctxt->valid) {
826f3a39 1391 if ((client_n = BN_new()) == NULL)
44a053a3 1392 fatal("%s: BN_new", __func__);
826f3a39 1393 buffer_get_bignum2(m, client_n);
1394 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1395 BN_clear_free(client_n);
1396 }
1397 buffer_clear(m);
1398 buffer_put_int(m, allowed);
bfe49944 1399 buffer_put_int(m, forced_command != NULL);
826f3a39 1400
1401 /* clear temporarily storage (used by generate challenge) */
1402 monitor_reset_key_state();
1403
1404 if (allowed && key != NULL) {
1405 key->type = KEY_RSA; /* cheat for key_to_blob */
1406 if (key_to_blob(key, &blob, &blen) == 0)
44a053a3 1407 fatal("%s: key_to_blob failed", __func__);
826f3a39 1408 buffer_put_string(m, blob, blen);
1409
1410 /* Save temporarily for comparison in verify */
1411 key_blob = blob;
1412 key_bloblen = blen;
1413 key_blobtype = MM_RSAUSERKEY;
826f3a39 1414 }
bfe49944 1415 if (key != NULL)
1416 key_free(key);
826f3a39 1417
1418 mm_append_debug(m);
1419
1420 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1421
1422 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1423 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1424 return (0);
1425}
1426
1427int
1428mm_answer_rsa_challenge(int socket, Buffer *m)
1429{
1430 Key *key = NULL;
1431 u_char *blob;
1432 u_int blen;
1433
44a053a3 1434 debug3("%s entering", __func__);
826f3a39 1435
1436 if (!authctxt->valid)
44a053a3 1437 fatal("%s: authctxt not valid", __func__);
826f3a39 1438 blob = buffer_get_string(m, &blen);
1439 if (!monitor_allowed_key(blob, blen))
44a053a3 1440 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1441 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
44a053a3 1442 fatal("%s: key type mismatch", __func__);
826f3a39 1443 if ((key = key_from_blob(blob, blen)) == NULL)
44a053a3 1444 fatal("%s: received bad key", __func__);
826f3a39 1445
1446 if (ssh1_challenge)
1447 BN_clear_free(ssh1_challenge);
1448 ssh1_challenge = auth_rsa_generate_challenge(key);
1449
1450 buffer_clear(m);
1451 buffer_put_bignum2(m, ssh1_challenge);
1452
44a053a3 1453 debug3("%s sending reply", __func__);
826f3a39 1454 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1455
1456 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
bfe49944 1457
1458 xfree(blob);
1459 key_free(key);
826f3a39 1460 return (0);
1461}
1462
1463int
1464mm_answer_rsa_response(int socket, Buffer *m)
1465{
1466 Key *key = NULL;
1467 u_char *blob, *response;
1468 u_int blen, len;
1469 int success;
1470
44a053a3 1471 debug3("%s entering", __func__);
826f3a39 1472
1473 if (!authctxt->valid)
44a053a3 1474 fatal("%s: authctxt not valid", __func__);
826f3a39 1475 if (ssh1_challenge == NULL)
44a053a3 1476 fatal("%s: no ssh1_challenge", __func__);
826f3a39 1477
1478 blob = buffer_get_string(m, &blen);
1479 if (!monitor_allowed_key(blob, blen))
44a053a3 1480 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1481 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
44a053a3 1482 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
826f3a39 1483 if ((key = key_from_blob(blob, blen)) == NULL)
44a053a3 1484 fatal("%s: received bad key", __func__);
826f3a39 1485 response = buffer_get_string(m, &len);
1486 if (len != 16)
44a053a3 1487 fatal("%s: received bad response to challenge", __func__);
826f3a39 1488 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1489
bfe49944 1490 xfree(blob);
826f3a39 1491 key_free(key);
1492 xfree(response);
1493
1494 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1495
1496 /* reset state */
1497 BN_clear_free(ssh1_challenge);
1498 ssh1_challenge = NULL;
1499 monitor_reset_key_state();
1500
1501 buffer_clear(m);
1502 buffer_put_int(m, success);
1503 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1504
1505 return (success);
1506}
1507
1508int
1509mm_answer_term(int socket, Buffer *req)
1510{
1511 extern struct monitor *pmonitor;
1512 int res, status;
1513
44a053a3 1514 debug3("%s: tearing down sessions", __func__);
826f3a39 1515
1516 /* The child is terminating */
1517 session_destroy_all(&mm_session_close);
1518
1519 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1520 if (errno != EINTR)
1521 exit(1);
1522
1523 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1524
1525 /* Terminate process */
1526 exit (res);
1527}
1528
1529void
1530monitor_apply_keystate(struct monitor *pmonitor)
1531{
1532 if (compat20) {
1533 set_newkeys(MODE_IN);
1534 set_newkeys(MODE_OUT);
1535 } else {
826f3a39 1536 packet_set_protocol_flags(child_state.ssh1protoflags);
44a053a3 1537 packet_set_encryption_key(child_state.ssh1key,
1538 child_state.ssh1keylen, child_state.ssh1cipher);
1539 xfree(child_state.ssh1key);
826f3a39 1540 }
1541
44a053a3 1542 /* for rc4 and other stateful ciphers */
826f3a39 1543 packet_set_keycontext(MODE_OUT, child_state.keyout);
1544 xfree(child_state.keyout);
1545 packet_set_keycontext(MODE_IN, child_state.keyin);
1546 xfree(child_state.keyin);
1547
1548 if (!compat20) {
1549 packet_set_iv(MODE_OUT, child_state.ivout);
1550 xfree(child_state.ivout);
1551 packet_set_iv(MODE_IN, child_state.ivin);
1552 xfree(child_state.ivin);
1553 }
1554
1555 memcpy(&incoming_stream, &child_state.incoming,
1556 sizeof(incoming_stream));
1557 memcpy(&outgoing_stream, &child_state.outgoing,
1558 sizeof(outgoing_stream));
1559
1560 /* Update with new address */
44a053a3 1561 if (options.compression)
1562 mm_init_compression(pmonitor->m_zlib);
826f3a39 1563
1564 /* Network I/O buffers */
1565 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1566 buffer_clear(&input);
1567 buffer_append(&input, child_state.input, child_state.ilen);
1568 memset(child_state.input, 0, child_state.ilen);
1569 xfree(child_state.input);
1570
1571 buffer_clear(&output);
1572 buffer_append(&output, child_state.output, child_state.olen);
1573 memset(child_state.output, 0, child_state.olen);
1574 xfree(child_state.output);
1575}
1576
1577static Kex *
1578mm_get_kex(Buffer *m)
1579{
1580 Kex *kex;
1581 void *blob;
1582 u_int bloblen;
1583
1584 kex = xmalloc(sizeof(*kex));
1585 memset(kex, 0, sizeof(*kex));
1586 kex->session_id = buffer_get_string(m, &kex->session_id_len);
44a053a3 1587 if ((session_id2 == NULL) ||
1588 (kex->session_id_len != session_id2_len) ||
1589 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1590 fatal("mm_get_get: internal error: bad session id");
826f3a39 1591 kex->we_need = buffer_get_int(m);
bfe49944 1592 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1593 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
23987cb8 1594#ifdef GSSAPI
7cac2b65 1595 kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
23987cb8 1596#endif
826f3a39 1597 kex->server = 1;
1598 kex->hostkey_type = buffer_get_int(m);
1599 kex->kex_type = buffer_get_int(m);
1600 blob = buffer_get_string(m, &bloblen);
1601 buffer_init(&kex->my);
1602 buffer_append(&kex->my, blob, bloblen);
1603 xfree(blob);
1604 blob = buffer_get_string(m, &bloblen);
1605 buffer_init(&kex->peer);
1606 buffer_append(&kex->peer, blob, bloblen);
1607 xfree(blob);
1608 kex->done = 1;
1609 kex->flags = buffer_get_int(m);
1610 kex->client_version_string = buffer_get_string(m, NULL);
1611 kex->server_version_string = buffer_get_string(m, NULL);
1612 kex->load_host_key=&get_hostkey_by_type;
1613 kex->host_key_index=&get_hostkey_index;
1614
1615 return (kex);
1616}
1617
1618/* This function requries careful sanity checking */
1619
1620void
1621mm_get_keystate(struct monitor *pmonitor)
1622{
1623 Buffer m;
1624 u_char *blob, *p;
1625 u_int bloblen, plen;
7cac2b65 1626 u_int32_t seqnr, packets;
1627 u_int64_t blocks;
826f3a39 1628
44a053a3 1629 debug3("%s: Waiting for new keys", __func__);
826f3a39 1630
1631 buffer_init(&m);
1632 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1633 if (!compat20) {
1634 child_state.ssh1protoflags = buffer_get_int(&m);
1635 child_state.ssh1cipher = buffer_get_int(&m);
44a053a3 1636 child_state.ssh1key = buffer_get_string(&m,
1637 &child_state.ssh1keylen);
826f3a39 1638 child_state.ivout = buffer_get_string(&m,
1639 &child_state.ivoutlen);
1640 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1641 goto skip;
1642 } else {
1643 /* Get the Kex for rekeying */
1644 *pmonitor->m_pkex = mm_get_kex(&m);
1645 }
1646
1647 blob = buffer_get_string(&m, &bloblen);
1648 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1649 xfree(blob);
1650
44a053a3 1651 debug3("%s: Waiting for second key", __func__);
826f3a39 1652 blob = buffer_get_string(&m, &bloblen);
1653 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1654 xfree(blob);
1655
1656 /* Now get sequence numbers for the packets */
7cac2b65 1657 seqnr = buffer_get_int(&m);
1658 blocks = buffer_get_int64(&m);
1659 packets = buffer_get_int(&m);
1660 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1661 seqnr = buffer_get_int(&m);
1662 blocks = buffer_get_int64(&m);
1663 packets = buffer_get_int(&m);
1664 packet_set_state(MODE_IN, seqnr, blocks, packets);
826f3a39 1665
1666 skip:
1667 /* Get the key context */
1668 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1669 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1670
44a053a3 1671 debug3("%s: Getting compression state", __func__);
826f3a39 1672 /* Get compression state */
1673 p = buffer_get_string(&m, &plen);
1674 if (plen != sizeof(child_state.outgoing))
44a053a3 1675 fatal("%s: bad request size", __func__);
826f3a39 1676 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1677 xfree(p);
1678
1679 p = buffer_get_string(&m, &plen);
1680 if (plen != sizeof(child_state.incoming))
44a053a3 1681 fatal("%s: bad request size", __func__);
826f3a39 1682 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1683 xfree(p);
1684
1685 /* Network I/O buffers */
44a053a3 1686 debug3("%s: Getting Network I/O buffers", __func__);
826f3a39 1687 child_state.input = buffer_get_string(&m, &child_state.ilen);
1688 child_state.output = buffer_get_string(&m, &child_state.olen);
1689
1690 buffer_free(&m);
1691}
1692
1693
1694/* Allocation functions for zlib */
1695void *
1696mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1697{
bfe49944 1698 size_t len = (size_t) size * ncount;
826f3a39 1699 void *address;
1700
d03f4262 1701 if (len == 0 || ncount > SIZE_T_MAX / size)
276b07a3 1702 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1703
1704 address = mm_malloc(mm, len);
826f3a39 1705
1706 return (address);
1707}
1708
1709void
1710mm_zfree(struct mm_master *mm, void *address)
1711{
1712 mm_free(mm, address);
1713}
1714
1715void
1716mm_init_compression(struct mm_master *mm)
1717{
1718 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1719 outgoing_stream.zfree = (free_func)mm_zfree;
1720 outgoing_stream.opaque = mm;
1721
1722 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1723 incoming_stream.zfree = (free_func)mm_zfree;
1724 incoming_stream.opaque = mm;
1725}
1726
1727/* XXX */
1728
1729#define FD_CLOSEONEXEC(x) do { \
1730 if (fcntl(x, F_SETFD, 1) == -1) \
1731 fatal("fcntl(%d, F_SETFD)", x); \
1732} while (0)
1733
1734static void
1735monitor_socketpair(int *pair)
1736{
1737#ifdef HAVE_SOCKETPAIR
1738 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
44a053a3 1739 fatal("%s: socketpair", __func__);
826f3a39 1740#else
1741 fatal("%s: UsePrivilegeSeparation=yes not supported",
44a053a3 1742 __func__);
826f3a39 1743#endif
1744 FD_CLOSEONEXEC(pair[0]);
1745 FD_CLOSEONEXEC(pair[1]);
1746}
1747
1748#define MM_MEMSIZE 65536
1749
1750struct monitor *
1751monitor_init(void)
1752{
1753 struct monitor *mon;
1754 int pair[2];
1755
1756 mon = xmalloc(sizeof(*mon));
1757
540d72c3 1758 mon->m_pid = 0;
826f3a39 1759 monitor_socketpair(pair);
1760
1761 mon->m_recvfd = pair[0];
1762 mon->m_sendfd = pair[1];
1763
1764 /* Used to share zlib space across processes */
44a053a3 1765 if (options.compression) {
1766 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1767 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
826f3a39 1768
44a053a3 1769 /* Compression needs to share state across borders */
1770 mm_init_compression(mon->m_zlib);
1771 }
826f3a39 1772
1773 return mon;
1774}
1775
1776void
1777monitor_reinit(struct monitor *mon)
1778{
1779 int pair[2];
1780
1781 monitor_socketpair(pair);
1782
1783 mon->m_recvfd = pair[0];
1784 mon->m_sendfd = pair[1];
1785}
b59afbfe 1786
7cac2b65 1787#ifdef GSSAPI
1788int
1789mm_answer_gss_setup_ctx(int socket, Buffer *m)
1790{
1791 gss_OID_desc oid;
1792 OM_uint32 major;
1793 u_int len;
b59afbfe 1794
7cac2b65 1795 oid.elements = buffer_get_string(m, &len);
1796 oid.length = len;
b59afbfe 1797
7cac2b65 1798 major = ssh_gssapi_server_ctx(&gsscontext, &oid);
e23e524c 1799
7cac2b65 1800 xfree(oid.elements);
1801
1802 buffer_clear(m);
1803 buffer_put_int(m, major);
1804
1805 mm_request_send(socket,MONITOR_ANS_GSSSETUP, m);
1806
1807 /* Now we have a context, enable the step */
1808 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1809
1810 return (0);
b59afbfe 1811}
1812
1813int
7cac2b65 1814mm_answer_gss_accept_ctx(int socket, Buffer *m)
1815{
1816 gss_buffer_desc in;
1817 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1818 OM_uint32 major,minor;
1819 OM_uint32 flags = 0; /* GSI needs this */
1820 u_int len;
b59afbfe 1821
7cac2b65 1822 in.value = buffer_get_string(m, &len);
1823 in.length = len;
1824 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1825 xfree(in.value);
b59afbfe 1826
7cac2b65 1827 buffer_clear(m);
1828 buffer_put_int(m, major);
1829 buffer_put_string(m, out.value, out.length);
1830 buffer_put_int(m, flags);
1831 mm_request_send(socket, MONITOR_ANS_GSSSTEP, m);
b59afbfe 1832
7cac2b65 1833 gss_release_buffer(&minor, &out);
b59afbfe 1834
e23e524c 1835 if (major==GSS_S_COMPLETE) {
7cac2b65 1836 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1837 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1838 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
540d72c3 1839 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
e23e524c 1840 }
7cac2b65 1841 return (0);
b59afbfe 1842}
e23e524c 1843
540d72c3 1844int
1845mm_answer_gss_checkmic(int socket, Buffer *m)
1846{
1847 gss_buffer_desc gssbuf, mic;
1848 OM_uint32 ret;
1849 u_int len;
1850
1851 gssbuf.value = buffer_get_string(m, &len);
1852 gssbuf.length = len;
1853 mic.value = buffer_get_string(m, &len);
1854 mic.length = len;
1855
1856 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1857
1858 xfree(gssbuf.value);
1859 xfree(mic.value);
1860
1861 buffer_clear(m);
1862 buffer_put_int(m, ret);
1863
1864 mm_request_send(socket, MONITOR_ANS_GSSCHECKMIC, m);
1865
1866 if (!GSS_ERROR(ret))
1867 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1868
1869 return (0);
1870}
1871
b59afbfe 1872int
7cac2b65 1873mm_answer_gss_userok(int socket, Buffer *m)
1874{
b59afbfe 1875 int authenticated;
1876
7cac2b65 1877 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
b59afbfe 1878
7cac2b65 1879 buffer_clear(m);
1880 buffer_put_int(m, authenticated);
b59afbfe 1881
7cac2b65 1882 debug3("%s: sending result %d", __func__, authenticated);
1883 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
b59afbfe 1884
540d72c3 1885 auth_method="gssapi-with-mic";
7cac2b65 1886
1887 /* Monitor loop will terminate if authenticated */
1888 return (authenticated);
b59afbfe 1889}
23987cb8 1890
b59afbfe 1891int
1892mm_answer_gss_sign(int socket, Buffer *m) {
1893 gss_buffer_desc data,hash;
1894 OM_uint32 major,minor;
1895
1896 data.value = buffer_get_string(m,&data.length);
1897 if (data.length != 16) { /* HACK - i.e. we are using SSHv1 */
1898 if (data.length != 20)
1899 fatal("%s: data length incorrect: %d", __func__, data.length);
1900
1901 /* Save the session ID - only first time round */
1902 if (session_id2_len == 0) {
1903 session_id2_len=data.length;
1904 session_id2 = xmalloc(session_id2_len);
1905 memcpy(session_id2, data.value, session_id2_len);
1906 }
1907 } /* HACK - end */
1908 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1909
1910 xfree(data.value);
1911
1912 buffer_clear(m);
1913 buffer_put_int(m, major);
1914 buffer_put_string(m, hash.value, hash.length);
1915
1916 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1917
1918 gss_release_buffer(&minor,&hash);
1919
1920 /* Turn on permissions for getpwnam */
1921 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1922
1923 return(0);
1924}
1925
e23e524c 1926int
1927mm_answer_gss_error(int socket, Buffer *m) {
1928 OM_uint32 major,minor;
1929 char *msg;
1930
1931 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
1932 buffer_clear(m);
1933 buffer_put_int(m,major);
1934 buffer_put_int(m,minor);
1935 buffer_put_cstring(m,msg);
1936
1937 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
1938
1939 xfree(msg);
1940
1941 return(0);
1942}
1943
9eeaa28e 1944int
1945mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
1946 OM_uint32 major,minor;
1947 gss_OID_set mech_set;
1948 int i;
1949
1950 major=gss_indicate_mechs(&minor, &mech_set);
1951
1952 buffer_clear(m);
1953 buffer_put_int(m, major);
1954 buffer_put_int(m, mech_set->count);
1955 for (i=0; i < mech_set->count; i++) {
1956 buffer_put_string(m, mech_set->elements[i].elements,
1957 mech_set->elements[i].length);
1958 }
1959
e23e524c 1960#if !defined(MECHGLUE) /* mechglue memory management bug ??? */
1961 gss_release_oid_set(&minor,&mech_set);
1962#endif
1963
9eeaa28e 1964 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
1965
1966 return(0);
1967}
1968
1969int
e23e524c 1970mm_answer_gss_localname(int socket, Buffer *m) {
1971 char *name;
9eeaa28e 1972
e23e524c 1973 ssh_gssapi_localname(&name);
9eeaa28e 1974
e23e524c 1975 buffer_clear(m);
1976 if (name) {
1977 buffer_put_cstring(m, name);
1978 debug3("%s: sending result %s", __func__, name);
1979 xfree(name);
1980 } else {
1981 buffer_put_cstring(m, "");
1982 debug3("%s: sending result \"\"", __func__);
1983 }
1984
1985 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);
9eeaa28e 1986
23987cb8 1987 return(0);
9eeaa28e 1988}
b59afbfe 1989#endif /* GSSAPI */
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