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2980ea68 1/*
2 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
3 * Copyright 2002 Markus Friedl <markus@openbsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "includes.h"
1c14df9e 28RCSID("$OpenBSD: monitor.c,v 1.36 2003/04/01 10:22:21 markus Exp $");
2980ea68 29
30#include <openssl/dh.h>
31
32#ifdef SKEY
33#include <skey.h>
34#endif
35
36#include "ssh.h"
37#include "auth.h"
38#include "kex.h"
39#include "dh.h"
40#include "zlib.h"
41#include "packet.h"
42#include "auth-options.h"
43#include "sshpty.h"
44#include "channels.h"
45#include "session.h"
46#include "sshlogin.h"
47#include "canohost.h"
48#include "log.h"
49#include "servconf.h"
50#include "monitor.h"
51#include "monitor_mm.h"
52#include "monitor_wrap.h"
53#include "monitor_fdpass.h"
54#include "xmalloc.h"
55#include "misc.h"
56#include "buffer.h"
57#include "bufaux.h"
58#include "compat.h"
59#include "ssh2.h"
60#include "mpaux.h"
61
ff2d7a98 62#ifdef GSSAPI
63#include "ssh-gss.h"
64static Gssctxt *gsscontext = NULL;
65#endif
66
2980ea68 67/* Imports */
68extern ServerOptions options;
69extern u_int utmp_len;
70extern Newkeys *current_keys[];
71extern z_stream incoming_stream;
72extern z_stream outgoing_stream;
73extern u_char session_id[];
74extern Buffer input, output;
75extern Buffer auth_debug;
76extern int auth_debug_init;
77
78/* State exported from the child */
79
80struct {
81 z_stream incoming;
82 z_stream outgoing;
83 u_char *keyin;
84 u_int keyinlen;
85 u_char *keyout;
86 u_int keyoutlen;
87 u_char *ivin;
88 u_int ivinlen;
89 u_char *ivout;
90 u_int ivoutlen;
ff2d7a98 91 u_char *ssh1key;
92 u_int ssh1keylen;
2980ea68 93 int ssh1cipher;
94 int ssh1protoflags;
95 u_char *input;
96 u_int ilen;
97 u_char *output;
98 u_int olen;
99} child_state;
100
101/* Functions on the montior that answer unprivileged requests */
102
103int mm_answer_moduli(int, Buffer *);
104int mm_answer_sign(int, Buffer *);
105int mm_answer_pwnamallow(int, Buffer *);
106int mm_answer_auth2_read_banner(int, Buffer *);
107int mm_answer_authserv(int, Buffer *);
108int mm_answer_authpassword(int, Buffer *);
109int mm_answer_bsdauthquery(int, Buffer *);
110int mm_answer_bsdauthrespond(int, Buffer *);
111int mm_answer_skeyquery(int, Buffer *);
112int mm_answer_skeyrespond(int, Buffer *);
113int mm_answer_keyallowed(int, Buffer *);
114int mm_answer_keyverify(int, Buffer *);
115int mm_answer_pty(int, Buffer *);
116int mm_answer_pty_cleanup(int, Buffer *);
117int mm_answer_term(int, Buffer *);
118int mm_answer_rsa_keyallowed(int, Buffer *);
119int mm_answer_rsa_challenge(int, Buffer *);
120int mm_answer_rsa_response(int, Buffer *);
121int mm_answer_sesskey(int, Buffer *);
122int mm_answer_sessid(int, Buffer *);
123
124#ifdef USE_PAM
125int mm_answer_pam_start(int, Buffer *);
126#endif
127
88928908 128#ifdef KRB4
129int mm_answer_krb4(int, Buffer *);
130#endif
131#ifdef KRB5
132int mm_answer_krb5(int, Buffer *);
133#endif
134
ff2d7a98 135#ifdef GSSAPI
136int mm_answer_gss_setup_ctx(int, Buffer *);
137int mm_answer_gss_accept_ctx(int, Buffer *);
138int mm_answer_gss_userok(int, Buffer *);
ff2d7a98 139int mm_answer_gss_sign(int, Buffer *);
88928908 140int mm_answer_gss_error(int, Buffer *);
98f19977 141int mm_answer_gss_indicate_mechs(int, Buffer *);
88928908 142int mm_answer_gss_localname(int, Buffer *);
ff2d7a98 143#endif
144
145#ifdef GSI
146int mm_answer_gsi_gridmap(int, Buffer *);
147#endif
148
2980ea68 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;
e54b3d7c 156static char *hostbased_cuser = NULL;
157static char *hostbased_chost = NULL;
2980ea68 158static char *auth_method = "unknown";
ff2d7a98 159static int session_id2_len = 0;
160static u_char *session_id2 = NULL;
2980ea68 161
162struct mon_table {
163 enum monitor_reqtype type;
164 int flags;
165 int (*f)(int, Buffer *);
166};
167
168#define MON_ISAUTH 0x0004 /* Required for Authentication */
169#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
170#define MON_ONCE 0x0010 /* Disable after calling */
171
172#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
173
174#define MON_PERMIT 0x1000 /* Request is permitted */
175
176struct mon_table mon_dispatch_proto20[] = {
177 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
178 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
ff2d7a98 179 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
2980ea68 180 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
181 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
182 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
183#ifdef USE_PAM
ff2d7a98 184 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
2980ea68 185#endif
186#ifdef BSD_AUTH
187 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
188 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
189#endif
190#ifdef SKEY
191 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
192 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
ff2d7a98 193#endif
194#ifdef GSSAPI
195 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
196 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
197 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
88928908 198 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
98f19977 199 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
ff2d7a98 200 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
88928908 201 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
2980ea68 202#endif
203 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
204 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
205 {0, 0, NULL}
206};
207
208struct mon_table mon_dispatch_postauth20[] = {
ff2d7a98 209#ifdef GSSAPI
210 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
211 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
212 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
88928908 213 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
98f19977 214 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
ff2d7a98 215#endif
2980ea68 216 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
217 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
218 {MONITOR_REQ_PTY, 0, mm_answer_pty},
219 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
220 {MONITOR_REQ_TERM, 0, mm_answer_term},
221 {0, 0, NULL}
222};
223
224struct mon_table mon_dispatch_proto15[] = {
225 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
226 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
227 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
228 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
229 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
230 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
231 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
232 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
2980ea68 233#ifdef BSD_AUTH
234 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
235 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
236#endif
237#ifdef SKEY
238 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
239 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
240#endif
ff2d7a98 241#ifdef GSSAPI
242 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
243 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
244 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
245 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
98f19977 246 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
ff2d7a98 247#endif
248#ifdef GSI
249 {MONITOR_REQ_GSIGRIDMAP, MON_PERMIT, mm_answer_gsi_gridmap},
250#endif
2980ea68 251#ifdef USE_PAM
ff2d7a98 252 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
e54b3d7c 253#endif
254#ifdef KRB4
255 {MONITOR_REQ_KRB4, MON_ONCE|MON_AUTH, mm_answer_krb4},
256#endif
257#ifdef KRB5
258 {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5},
2980ea68 259#endif
260 {0, 0, NULL}
261};
262
263struct mon_table mon_dispatch_postauth15[] = {
ff2d7a98 264#ifdef GSSAPI
265 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
266 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
267 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
98f19977 268 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
ff2d7a98 269#endif
2980ea68 270 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
271 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
272 {MONITOR_REQ_TERM, 0, mm_answer_term},
273 {0, 0, NULL}
274};
275
276struct mon_table *mon_dispatch;
277
278/* Specifies if a certain message is allowed at the moment */
279
280static void
281monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
282{
283 while (ent->f != NULL) {
284 if (ent->type == type) {
285 ent->flags &= ~MON_PERMIT;
286 ent->flags |= permit ? MON_PERMIT : 0;
287 return;
288 }
289 ent++;
290 }
291}
292
293static void
294monitor_permit_authentications(int permit)
295{
296 struct mon_table *ent = mon_dispatch;
297
298 while (ent->f != NULL) {
299 if (ent->flags & MON_AUTH) {
300 ent->flags &= ~MON_PERMIT;
301 ent->flags |= permit ? MON_PERMIT : 0;
302 }
303 ent++;
304 }
305}
306
307Authctxt *
308monitor_child_preauth(struct monitor *pmonitor)
309{
310 struct mon_table *ent;
311 int authenticated = 0;
312
313 debug3("preauth child monitor started");
314
315 if (compat20) {
316 mon_dispatch = mon_dispatch_proto20;
317
318 /* Permit requests for moduli and signatures */
319 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
320 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
ff2d7a98 321#ifdef GSSAPI
322 /* and for the GSSAPI key exchange */
323 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
88928908 324 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
98f19977 325 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
ff2d7a98 326#endif
2980ea68 327 } else {
328 mon_dispatch = mon_dispatch_proto15;
329
330 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
ff2d7a98 331#ifdef GSSAPI
98f19977 332 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
88928908 333 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
ff2d7a98 334#endif
335#ifdef GSI
336 monitor_permit(mon_dispatch, MONITOR_REQ_GSIGRIDMAP, 1);
337#endif
2980ea68 338 }
339
340 authctxt = authctxt_new();
341
342 /* The first few requests do not require asynchronous access */
343 while (!authenticated) {
344 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
345 if (authenticated) {
346 if (!(ent->flags & MON_AUTHDECIDE))
347 fatal("%s: unexpected authentication from %d",
ff2d7a98 348 __func__, ent->type);
2980ea68 349 if (authctxt->pw->pw_uid == 0 &&
350 !auth_root_allowed(auth_method))
351 authenticated = 0;
352#ifdef USE_PAM
353 if (!do_pam_account(authctxt->pw->pw_name, NULL))
354 authenticated = 0;
355#endif
356 }
357
358 if (ent->flags & MON_AUTHDECIDE) {
359 auth_log(authctxt, authenticated, auth_method,
360 compat20 ? " ssh2" : "");
361 if (!authenticated)
362 authctxt->failures++;
363 }
364 }
365
366 if (!authctxt->valid)
ff2d7a98 367 fatal("%s: authenticated invalid user", __func__);
2980ea68 368
369 debug("%s: %s has been authenticated by privileged process",
ff2d7a98 370 __func__, authctxt->user);
2980ea68 371
372 mm_get_keystate(pmonitor);
373
374 return (authctxt);
375}
376
377void
378monitor_child_postauth(struct monitor *pmonitor)
379{
380 if (compat20) {
381 mon_dispatch = mon_dispatch_postauth20;
382
383 /* Permit requests for moduli and signatures */
384 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
385 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
386 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
387
88928908 388#ifdef GSSAPI
389 /* and for the GSSAPI key exchange */
390 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
391 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
392 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
393#endif
394
2980ea68 395 } else {
396 mon_dispatch = mon_dispatch_postauth15;
397 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
398 }
98f19977 399#ifdef GSSAPI
88928908 400 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
98f19977 401#endif
2980ea68 402 if (!no_pty_flag) {
403 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
404 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
405 }
406
407 for (;;)
408 monitor_read(pmonitor, mon_dispatch, NULL);
409}
410
411void
412monitor_sync(struct monitor *pmonitor)
413{
ff2d7a98 414 if (options.compression) {
415 /* The member allocation is not visible, so sync it */
416 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
417 }
2980ea68 418}
419
420int
421monitor_read(struct monitor *pmonitor, struct mon_table *ent,
422 struct mon_table **pent)
423{
424 Buffer m;
425 int ret;
426 u_char type;
427
428 buffer_init(&m);
429
430 mm_request_receive(pmonitor->m_sendfd, &m);
431 type = buffer_get_char(&m);
432
ff2d7a98 433 debug3("%s: checking request %d", __func__, type);
2980ea68 434
435 while (ent->f != NULL) {
436 if (ent->type == type)
437 break;
438 ent++;
439 }
440
441 if (ent->f != NULL) {
442 if (!(ent->flags & MON_PERMIT))
ff2d7a98 443 fatal("%s: unpermitted request %d", __func__,
2980ea68 444 type);
445 ret = (*ent->f)(pmonitor->m_sendfd, &m);
446 buffer_free(&m);
447
448 /* The child may use this request only once, disable it */
449 if (ent->flags & MON_ONCE) {
ff2d7a98 450 debug2("%s: %d used once, disabling now", __func__,
2980ea68 451 type);
452 ent->flags &= ~MON_PERMIT;
453 }
454
455 if (pent != NULL)
456 *pent = ent;
457
458 return ret;
459 }
460
ff2d7a98 461 fatal("%s: unsupported request: %d", __func__, type);
2980ea68 462
463 /* NOTREACHED */
464 return (-1);
465}
466
467/* allowed key state */
468static int
469monitor_allowed_key(u_char *blob, u_int bloblen)
470{
471 /* make sure key is allowed */
472 if (key_blob == NULL || key_bloblen != bloblen ||
473 memcmp(key_blob, blob, key_bloblen))
474 return (0);
475 return (1);
476}
477
478static void
479monitor_reset_key_state(void)
480{
481 /* reset state */
482 if (key_blob != NULL)
483 xfree(key_blob);
484 if (hostbased_cuser != NULL)
485 xfree(hostbased_cuser);
486 if (hostbased_chost != NULL)
487 xfree(hostbased_chost);
488 key_blob = NULL;
489 key_bloblen = 0;
490 key_blobtype = MM_NOKEY;
491 hostbased_cuser = NULL;
492 hostbased_chost = NULL;
493}
494
495int
496mm_answer_moduli(int socket, Buffer *m)
497{
498 DH *dh;
499 int min, want, max;
500
501 min = buffer_get_int(m);
502 want = buffer_get_int(m);
503 max = buffer_get_int(m);
504
505 debug3("%s: got parameters: %d %d %d",
ff2d7a98 506 __func__, min, want, max);
2980ea68 507 /* We need to check here, too, in case the child got corrupted */
508 if (max < min || want < min || max < want)
509 fatal("%s: bad parameters: %d %d %d",
ff2d7a98 510 __func__, min, want, max);
2980ea68 511
512 buffer_clear(m);
513
514 dh = choose_dh(min, want, max);
515 if (dh == NULL) {
516 buffer_put_char(m, 0);
517 return (0);
518 } else {
519 /* Send first bignum */
520 buffer_put_char(m, 1);
521 buffer_put_bignum2(m, dh->p);
522 buffer_put_bignum2(m, dh->g);
523
524 DH_free(dh);
525 }
526 mm_request_send(socket, MONITOR_ANS_MODULI, m);
527 return (0);
528}
529
530int
531mm_answer_sign(int socket, Buffer *m)
532{
533 Key *key;
534 u_char *p;
535 u_char *signature;
536 u_int siglen, datlen;
537 int keyid;
538
ff2d7a98 539 debug3("%s", __func__);
2980ea68 540
541 keyid = buffer_get_int(m);
542 p = buffer_get_string(m, &datlen);
543
544 if (datlen != 20)
e54b3d7c 545 fatal("%s: data length incorrect: %u", __func__, datlen);
ff2d7a98 546
547 /* save session id, it will be passed on the first call */
548 if (session_id2_len == 0) {
549 session_id2_len = datlen;
550 session_id2 = xmalloc(session_id2_len);
551 memcpy(session_id2, p, session_id2_len);
552 }
2980ea68 553
554 if ((key = get_hostkey_by_index(keyid)) == NULL)
ff2d7a98 555 fatal("%s: no hostkey from index %d", __func__, keyid);
2980ea68 556 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
ff2d7a98 557 fatal("%s: key_sign failed", __func__);
2980ea68 558
e54b3d7c 559 debug3("%s: signature %p(%u)", __func__, signature, siglen);
2980ea68 560
561 buffer_clear(m);
562 buffer_put_string(m, signature, siglen);
563
564 xfree(p);
565 xfree(signature);
566
567 mm_request_send(socket, MONITOR_ANS_SIGN, m);
568
569 /* Turn on permissions for getpwnam */
570 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
571
572 return (0);
573}
574
575/* Retrieves the password entry and also checks if the user is permitted */
576
577int
578mm_answer_pwnamallow(int socket, Buffer *m)
579{
580 char *login;
581 struct passwd *pwent;
582 int allowed = 0;
583
ff2d7a98 584 debug3("%s", __func__);
2980ea68 585
586 login = buffer_get_string(m, NULL);
587
588 pwent = getpwnamallow(login);
589
ff2d7a98 590 if (authctxt->user) xfree(authctxt->user);
2980ea68 591 authctxt->user = xstrdup(login);
592 setproctitle("%s [priv]", pwent ? login : "unknown");
593 xfree(login);
594
595 buffer_clear(m);
596
597 if (pwent == NULL) {
598 buffer_put_char(m, 0);
599 goto out;
600 }
601
602 allowed = 1;
603 authctxt->pw = pwent;
604 authctxt->valid = 1;
605
606 buffer_put_char(m, 1);
607 buffer_put_string(m, pwent, sizeof(struct passwd));
608 buffer_put_cstring(m, pwent->pw_name);
609 buffer_put_cstring(m, "*");
610 buffer_put_cstring(m, pwent->pw_gecos);
611#ifdef HAVE_PW_CLASS_IN_PASSWD
612 buffer_put_cstring(m, pwent->pw_class);
613#endif
614 buffer_put_cstring(m, pwent->pw_dir);
615 buffer_put_cstring(m, pwent->pw_shell);
616
617 out:
ff2d7a98 618 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
2980ea68 619 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
620
621 /* For SSHv1 allow authentication now */
622 if (!compat20)
623 monitor_permit_authentications(1);
624 else {
625 /* Allow service/style information on the auth context */
626 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
627 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
628 }
629
630#ifdef USE_PAM
631 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
632#endif
633
634 return (0);
635}
636
637int mm_answer_auth2_read_banner(int socket, Buffer *m)
638{
639 char *banner;
640
641 buffer_clear(m);
642 banner = auth2_read_banner();
643 buffer_put_cstring(m, banner != NULL ? banner : "");
644 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
645
646 if (banner != NULL)
e54b3d7c 647 xfree(banner);
2980ea68 648
649 return (0);
650}
651
652int
653mm_answer_authserv(int socket, Buffer *m)
654{
655 monitor_permit_authentications(1);
656
657 authctxt->service = buffer_get_string(m, NULL);
658 authctxt->style = buffer_get_string(m, NULL);
659 debug3("%s: service=%s, style=%s",
ff2d7a98 660 __func__, authctxt->service, authctxt->style);
2980ea68 661
662 if (strlen(authctxt->style) == 0) {
663 xfree(authctxt->style);
664 authctxt->style = NULL;
665 }
666
667 return (0);
668}
669
670int
671mm_answer_authpassword(int socket, Buffer *m)
672{
673 static int call_count;
674 char *passwd;
e54b3d7c 675 int authenticated;
676 u_int plen;
2980ea68 677
678 passwd = buffer_get_string(m, &plen);
679 /* Only authenticate if the context is valid */
ff2d7a98 680 authenticated = options.password_authentication &&
681 authctxt->valid && auth_password(authctxt, passwd);
2980ea68 682 memset(passwd, 0, strlen(passwd));
683 xfree(passwd);
684
685 buffer_clear(m);
686 buffer_put_int(m, authenticated);
687
ff2d7a98 688 debug3("%s: sending result %d", __func__, authenticated);
2980ea68 689 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
690
691 call_count++;
692 if (plen == 0 && call_count == 1)
693 auth_method = "none";
694 else
695 auth_method = "password";
696
697 /* Causes monitor loop to terminate if authenticated */
698 return (authenticated);
699}
700
701#ifdef BSD_AUTH
702int
703mm_answer_bsdauthquery(int socket, Buffer *m)
704{
705 char *name, *infotxt;
706 u_int numprompts;
707 u_int *echo_on;
708 char **prompts;
1c14df9e 709 u_int success;
2980ea68 710
1c14df9e 711 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
712 &prompts, &echo_on) < 0 ? 0 : 1;
2980ea68 713
714 buffer_clear(m);
1c14df9e 715 buffer_put_int(m, success);
716 if (success)
2980ea68 717 buffer_put_cstring(m, prompts[0]);
718
1c14df9e 719 debug3("%s: sending challenge success: %u", __func__, success);
2980ea68 720 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
721
1c14df9e 722 if (success) {
2980ea68 723 xfree(name);
724 xfree(infotxt);
725 xfree(prompts);
726 xfree(echo_on);
727 }
728
729 return (0);
730}
731
732int
733mm_answer_bsdauthrespond(int socket, Buffer *m)
734{
735 char *response;
736 int authok;
737
738 if (authctxt->as == 0)
ff2d7a98 739 fatal("%s: no bsd auth session", __func__);
2980ea68 740
741 response = buffer_get_string(m, NULL);
ff2d7a98 742 authok = options.challenge_response_authentication &&
743 auth_userresponse(authctxt->as, response, 0);
2980ea68 744 authctxt->as = NULL;
ff2d7a98 745 debug3("%s: <%s> = <%d>", __func__, response, authok);
2980ea68 746 xfree(response);
747
748 buffer_clear(m);
749 buffer_put_int(m, authok);
750
ff2d7a98 751 debug3("%s: sending authenticated: %d", __func__, authok);
2980ea68 752 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
753
754 auth_method = "bsdauth";
755
756 return (authok != 0);
757}
758#endif
759
760#ifdef SKEY
761int
762mm_answer_skeyquery(int socket, Buffer *m)
763{
764 struct skey skey;
765 char challenge[1024];
1c14df9e 766 u_int success;
2980ea68 767
1c14df9e 768 success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1;
2980ea68 769
770 buffer_clear(m);
1c14df9e 771 buffer_put_int(m, success);
772 if (success)
2980ea68 773 buffer_put_cstring(m, challenge);
774
1c14df9e 775 debug3("%s: sending challenge success: %u", __func__, success);
2980ea68 776 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
777
778 return (0);
779}
780
781int
782mm_answer_skeyrespond(int socket, Buffer *m)
783{
784 char *response;
785 int authok;
786
787 response = buffer_get_string(m, NULL);
788
ff2d7a98 789 authok = (options.challenge_response_authentication &&
790 authctxt->valid &&
2980ea68 791 skey_haskey(authctxt->pw->pw_name) == 0 &&
792 skey_passcheck(authctxt->pw->pw_name, response) != -1);
793
794 xfree(response);
795
796 buffer_clear(m);
797 buffer_put_int(m, authok);
798
ff2d7a98 799 debug3("%s: sending authenticated: %d", __func__, authok);
2980ea68 800 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
801
802 auth_method = "skey";
803
804 return (authok != 0);
805}
806#endif
807
808#ifdef USE_PAM
809int
810mm_answer_pam_start(int socket, Buffer *m)
811{
812 char *user;
813
814 user = buffer_get_string(m, NULL);
815
816 start_pam(user);
817
818 xfree(user);
819
820 return (0);
821}
822#endif
823
824static void
825mm_append_debug(Buffer *m)
826{
827 if (auth_debug_init && buffer_len(&auth_debug)) {
ff2d7a98 828 debug3("%s: Appending debug messages for child", __func__);
2980ea68 829 buffer_append(m, buffer_ptr(&auth_debug),
830 buffer_len(&auth_debug));
831 buffer_clear(&auth_debug);
832 }
833}
834
835int
836mm_answer_keyallowed(int socket, Buffer *m)
837{
838 Key *key;
e54b3d7c 839 char *cuser, *chost;
840 u_char *blob;
2980ea68 841 u_int bloblen;
842 enum mm_keytype type = 0;
843 int allowed = 0;
844
ff2d7a98 845 debug3("%s entering", __func__);
2980ea68 846
847 type = buffer_get_int(m);
848 cuser = buffer_get_string(m, NULL);
849 chost = buffer_get_string(m, NULL);
850 blob = buffer_get_string(m, &bloblen);
851
852 key = key_from_blob(blob, bloblen);
853
854 if ((compat20 && type == MM_RSAHOSTKEY) ||
855 (!compat20 && type != MM_RSAHOSTKEY))
ff2d7a98 856 fatal("%s: key type and protocol mismatch", __func__);
2980ea68 857
ff2d7a98 858 debug3("%s: key_from_blob: %p", __func__, key);
2980ea68 859
860 if (key != NULL && authctxt->pw != NULL) {
861 switch(type) {
862 case MM_USERKEY:
ff2d7a98 863 allowed = options.pubkey_authentication &&
864 user_key_allowed(authctxt->pw, key);
2980ea68 865 break;
866 case MM_HOSTKEY:
ff2d7a98 867 allowed = options.hostbased_authentication &&
868 hostbased_key_allowed(authctxt->pw,
2980ea68 869 cuser, chost, key);
870 break;
871 case MM_RSAHOSTKEY:
872 key->type = KEY_RSA1; /* XXX */
ff2d7a98 873 allowed = options.rhosts_rsa_authentication &&
874 auth_rhosts_rsa_key_allowed(authctxt->pw,
2980ea68 875 cuser, chost, key);
876 break;
877 default:
ff2d7a98 878 fatal("%s: unknown key type %d", __func__, type);
2980ea68 879 break;
880 }
2980ea68 881 }
1c14df9e 882 if (key != NULL)
883 key_free(key);
2980ea68 884
885 /* clear temporarily storage (used by verify) */
886 monitor_reset_key_state();
887
888 if (allowed) {
889 /* Save temporarily for comparison in verify */
890 key_blob = blob;
891 key_bloblen = bloblen;
892 key_blobtype = type;
893 hostbased_cuser = cuser;
894 hostbased_chost = chost;
895 }
896
897 debug3("%s: key %p is %s",
ff2d7a98 898 __func__, key, allowed ? "allowed" : "disallowed");
2980ea68 899
900 buffer_clear(m);
901 buffer_put_int(m, allowed);
1c14df9e 902 buffer_put_int(m, forced_command != NULL);
2980ea68 903
904 mm_append_debug(m);
905
906 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
907
908 if (type == MM_RSAHOSTKEY)
909 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
910
911 return (0);
912}
913
914static int
915monitor_valid_userblob(u_char *data, u_int datalen)
916{
917 Buffer b;
e54b3d7c 918 char *p;
2980ea68 919 u_int len;
920 int fail = 0;
2980ea68 921
922 buffer_init(&b);
923 buffer_append(&b, data, datalen);
924
925 if (datafellows & SSH_OLD_SESSIONID) {
ff2d7a98 926 p = buffer_ptr(&b);
927 len = buffer_len(&b);
928 if ((session_id2 == NULL) ||
929 (len < session_id2_len) ||
930 (memcmp(p, session_id2, session_id2_len) != 0))
931 fail++;
2980ea68 932 buffer_consume(&b, session_id2_len);
933 } else {
ff2d7a98 934 p = buffer_get_string(&b, &len);
935 if ((session_id2 == NULL) ||
936 (len != session_id2_len) ||
937 (memcmp(p, session_id2, session_id2_len) != 0))
2980ea68 938 fail++;
ff2d7a98 939 xfree(p);
2980ea68 940 }
941 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
942 fail++;
943 p = buffer_get_string(&b, NULL);
944 if (strcmp(authctxt->user, p) != 0) {
945 log("wrong user name passed to monitor: expected %s != %.100s",
946 authctxt->user, p);
947 fail++;
948 }
949 xfree(p);
950 buffer_skip_string(&b);
951 if (datafellows & SSH_BUG_PKAUTH) {
952 if (!buffer_get_char(&b))
953 fail++;
954 } else {
955 p = buffer_get_string(&b, NULL);
956 if (strcmp("publickey", p) != 0)
957 fail++;
958 xfree(p);
959 if (!buffer_get_char(&b))
960 fail++;
961 buffer_skip_string(&b);
962 }
963 buffer_skip_string(&b);
964 if (buffer_len(&b) != 0)
965 fail++;
966 buffer_free(&b);
967 return (fail == 0);
968}
969
970static int
e54b3d7c 971monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
972 char *chost)
2980ea68 973{
974 Buffer b;
e54b3d7c 975 char *p;
2980ea68 976 u_int len;
977 int fail = 0;
2980ea68 978
979 buffer_init(&b);
980 buffer_append(&b, data, datalen);
981
ff2d7a98 982 p = buffer_get_string(&b, &len);
983 if ((session_id2 == NULL) ||
984 (len != session_id2_len) ||
985 (memcmp(p, session_id2, session_id2_len) != 0))
2980ea68 986 fail++;
ff2d7a98 987 xfree(p);
988
2980ea68 989 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
990 fail++;
991 p = buffer_get_string(&b, NULL);
992 if (strcmp(authctxt->user, p) != 0) {
993 log("wrong user name passed to monitor: expected %s != %.100s",
994 authctxt->user, p);
995 fail++;
996 }
997 xfree(p);
998 buffer_skip_string(&b); /* service */
999 p = buffer_get_string(&b, NULL);
1000 if (strcmp(p, "hostbased") != 0)
1001 fail++;
1002 xfree(p);
1003 buffer_skip_string(&b); /* pkalg */
1004 buffer_skip_string(&b); /* pkblob */
1005
1006 /* verify client host, strip trailing dot if necessary */
1007 p = buffer_get_string(&b, NULL);
1008 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1009 p[len - 1] = '\0';
1010 if (strcmp(p, chost) != 0)
1011 fail++;
1012 xfree(p);
1013
1014 /* verify client user */
1015 p = buffer_get_string(&b, NULL);
1016 if (strcmp(p, cuser) != 0)
1017 fail++;
1018 xfree(p);
1019
1020 if (buffer_len(&b) != 0)
1021 fail++;
1022 buffer_free(&b);
1023 return (fail == 0);
1024}
1025
1026int
1027mm_answer_keyverify(int socket, Buffer *m)
1028{
1029 Key *key;
1030 u_char *signature, *data, *blob;
1031 u_int signaturelen, datalen, bloblen;
1032 int verified = 0;
1033 int valid_data = 0;
1034
1035 blob = buffer_get_string(m, &bloblen);
1036 signature = buffer_get_string(m, &signaturelen);
1037 data = buffer_get_string(m, &datalen);
1038
1039 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1040 !monitor_allowed_key(blob, bloblen))
ff2d7a98 1041 fatal("%s: bad key, not previously allowed", __func__);
2980ea68 1042
1043 key = key_from_blob(blob, bloblen);
1044 if (key == NULL)
ff2d7a98 1045 fatal("%s: bad public key blob", __func__);
2980ea68 1046
1047 switch (key_blobtype) {
1048 case MM_USERKEY:
1049 valid_data = monitor_valid_userblob(data, datalen);
1050 break;
1051 case MM_HOSTKEY:
1052 valid_data = monitor_valid_hostbasedblob(data, datalen,
1053 hostbased_cuser, hostbased_chost);
1054 break;
1055 default:
1056 valid_data = 0;
1057 break;
1058 }
1059 if (!valid_data)
ff2d7a98 1060 fatal("%s: bad signature data blob", __func__);
2980ea68 1061
1062 verified = key_verify(key, signature, signaturelen, data, datalen);
1063 debug3("%s: key %p signature %s",
ff2d7a98 1064 __func__, key, verified ? "verified" : "unverified");
2980ea68 1065
1066 key_free(key);
1067 xfree(blob);
1068 xfree(signature);
1069 xfree(data);
1070
ff2d7a98 1071 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1072
2980ea68 1073 monitor_reset_key_state();
1074
1075 buffer_clear(m);
1076 buffer_put_int(m, verified);
1077 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1078
2980ea68 1079 return (verified);
1080}
1081
1082static void
1083mm_record_login(Session *s, struct passwd *pw)
1084{
1085 socklen_t fromlen;
1086 struct sockaddr_storage from;
1087
1088 /*
1089 * Get IP address of client. If the connection is not a socket, let
1090 * the address be 0.0.0.0.
1091 */
1092 memset(&from, 0, sizeof(from));
e54b3d7c 1093 fromlen = sizeof(from);
2980ea68 1094 if (packet_connection_is_on_socket()) {
2980ea68 1095 if (getpeername(packet_get_connection_in(),
1096 (struct sockaddr *) & from, &fromlen) < 0) {
1097 debug("getpeername: %.100s", strerror(errno));
1098 fatal_cleanup();
1099 }
1100 }
1101 /* Record that there was a login on that tty from the remote host. */
1102 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1103 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
e54b3d7c 1104 (struct sockaddr *)&from, fromlen);
2980ea68 1105}
1106
1107static void
1108mm_session_close(Session *s)
1109{
ff2d7a98 1110 debug3("%s: session %d pid %d", __func__, s->self, s->pid);
2980ea68 1111 if (s->ttyfd != -1) {
ff2d7a98 1112 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
2980ea68 1113 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
1114 session_pty_cleanup2(s);
1115 }
1116 s->used = 0;
1117}
1118
1119int
1120mm_answer_pty(int socket, Buffer *m)
1121{
1122 extern struct monitor *pmonitor;
1123 Session *s;
1124 int res, fd0;
1125
ff2d7a98 1126 debug3("%s entering", __func__);
2980ea68 1127
1128 buffer_clear(m);
1129 s = session_new();
1130 if (s == NULL)
1131 goto error;
1132 s->authctxt = authctxt;
1133 s->pw = authctxt->pw;
1134 s->pid = pmonitor->m_pid;
1135 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1136 if (res == 0)
1137 goto error;
1138 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1139 pty_setowner(authctxt->pw, s->tty);
1140
1141 buffer_put_int(m, 1);
1142 buffer_put_cstring(m, s->tty);
1143 mm_request_send(socket, MONITOR_ANS_PTY, m);
1144
1145 mm_send_fd(socket, s->ptyfd);
1146 mm_send_fd(socket, s->ttyfd);
1147
1148 /* We need to trick ttyslot */
1149 if (dup2(s->ttyfd, 0) == -1)
ff2d7a98 1150 fatal("%s: dup2", __func__);
2980ea68 1151
1152 mm_record_login(s, authctxt->pw);
1153
1154 /* Now we can close the file descriptor again */
1155 close(0);
1156
1157 /* make sure nothing uses fd 0 */
1158 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
ff2d7a98 1159 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
2980ea68 1160 if (fd0 != 0)
ff2d7a98 1161 error("%s: fd0 %d != 0", __func__, fd0);
2980ea68 1162
1163 /* slave is not needed */
1164 close(s->ttyfd);
1165 s->ttyfd = s->ptyfd;
1166 /* no need to dup() because nobody closes ptyfd */
1167 s->ptymaster = s->ptyfd;
1168
ff2d7a98 1169 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
2980ea68 1170
1171 return (0);
1172
1173 error:
1174 if (s != NULL)
1175 mm_session_close(s);
1176 buffer_put_int(m, 0);
1177 mm_request_send(socket, MONITOR_ANS_PTY, m);
1178 return (0);
1179}
1180
1181int
1182mm_answer_pty_cleanup(int socket, Buffer *m)
1183{
1184 Session *s;
1185 char *tty;
1186
ff2d7a98 1187 debug3("%s entering", __func__);
2980ea68 1188
1189 tty = buffer_get_string(m, NULL);
1190 if ((s = session_by_tty(tty)) != NULL)
1191 mm_session_close(s);
1192 buffer_clear(m);
1193 xfree(tty);
1194 return (0);
1195}
1196
1197int
1198mm_answer_sesskey(int socket, Buffer *m)
1199{
1200 BIGNUM *p;
1201 int rsafail;
1202
1203 /* Turn off permissions */
1204 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1205
1206 if ((p = BN_new()) == NULL)
ff2d7a98 1207 fatal("%s: BN_new", __func__);
2980ea68 1208
1209 buffer_get_bignum2(m, p);
1210
1211 rsafail = ssh1_session_key(p);
1212
1213 buffer_clear(m);
1214 buffer_put_int(m, rsafail);
1215 buffer_put_bignum2(m, p);
1216
1217 BN_clear_free(p);
1218
1219 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1220
1221 /* Turn on permissions for sessid passing */
1222 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1223
1224 return (0);
1225}
1226
1227int
1228mm_answer_sessid(int socket, Buffer *m)
1229{
1230 int i;
1231
ff2d7a98 1232 debug3("%s entering", __func__);
2980ea68 1233
1234 if (buffer_len(m) != 16)
ff2d7a98 1235 fatal("%s: bad ssh1 session id", __func__);
2980ea68 1236 for (i = 0; i < 16; i++)
1237 session_id[i] = buffer_get_char(m);
1238
1239 /* Turn on permissions for getpwnam */
1240 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1241
1242 return (0);
1243}
1244
1245int
1246mm_answer_rsa_keyallowed(int socket, Buffer *m)
1247{
1248 BIGNUM *client_n;
1249 Key *key = NULL;
1250 u_char *blob = NULL;
1251 u_int blen = 0;
1252 int allowed = 0;
1253
ff2d7a98 1254 debug3("%s entering", __func__);
2980ea68 1255
ff2d7a98 1256 if (options.rsa_authentication && authctxt->valid) {
2980ea68 1257 if ((client_n = BN_new()) == NULL)
ff2d7a98 1258 fatal("%s: BN_new", __func__);
2980ea68 1259 buffer_get_bignum2(m, client_n);
1260 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1261 BN_clear_free(client_n);
1262 }
1263 buffer_clear(m);
1264 buffer_put_int(m, allowed);
1c14df9e 1265 buffer_put_int(m, forced_command != NULL);
2980ea68 1266
1267 /* clear temporarily storage (used by generate challenge) */
1268 monitor_reset_key_state();
1269
1270 if (allowed && key != NULL) {
1271 key->type = KEY_RSA; /* cheat for key_to_blob */
1272 if (key_to_blob(key, &blob, &blen) == 0)
ff2d7a98 1273 fatal("%s: key_to_blob failed", __func__);
2980ea68 1274 buffer_put_string(m, blob, blen);
1275
1276 /* Save temporarily for comparison in verify */
1277 key_blob = blob;
1278 key_bloblen = blen;
1279 key_blobtype = MM_RSAUSERKEY;
2980ea68 1280 }
1c14df9e 1281 if (key != NULL)
1282 key_free(key);
2980ea68 1283
1284 mm_append_debug(m);
1285
1286 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1287
1288 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1289 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1290 return (0);
1291}
1292
1293int
1294mm_answer_rsa_challenge(int socket, Buffer *m)
1295{
1296 Key *key = NULL;
1297 u_char *blob;
1298 u_int blen;
1299
ff2d7a98 1300 debug3("%s entering", __func__);
2980ea68 1301
1302 if (!authctxt->valid)
ff2d7a98 1303 fatal("%s: authctxt not valid", __func__);
2980ea68 1304 blob = buffer_get_string(m, &blen);
1305 if (!monitor_allowed_key(blob, blen))
ff2d7a98 1306 fatal("%s: bad key, not previously allowed", __func__);
2980ea68 1307 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
ff2d7a98 1308 fatal("%s: key type mismatch", __func__);
2980ea68 1309 if ((key = key_from_blob(blob, blen)) == NULL)
ff2d7a98 1310 fatal("%s: received bad key", __func__);
2980ea68 1311
1312 if (ssh1_challenge)
1313 BN_clear_free(ssh1_challenge);
1314 ssh1_challenge = auth_rsa_generate_challenge(key);
1315
1316 buffer_clear(m);
1317 buffer_put_bignum2(m, ssh1_challenge);
1318
ff2d7a98 1319 debug3("%s sending reply", __func__);
2980ea68 1320 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1321
1322 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1c14df9e 1323
1324 xfree(blob);
1325 key_free(key);
2980ea68 1326 return (0);
1327}
1328
1329int
1330mm_answer_rsa_response(int socket, Buffer *m)
1331{
1332 Key *key = NULL;
1333 u_char *blob, *response;
1334 u_int blen, len;
1335 int success;
1336
ff2d7a98 1337 debug3("%s entering", __func__);
2980ea68 1338
1339 if (!authctxt->valid)
ff2d7a98 1340 fatal("%s: authctxt not valid", __func__);
2980ea68 1341 if (ssh1_challenge == NULL)
ff2d7a98 1342 fatal("%s: no ssh1_challenge", __func__);
2980ea68 1343
1344 blob = buffer_get_string(m, &blen);
1345 if (!monitor_allowed_key(blob, blen))
ff2d7a98 1346 fatal("%s: bad key, not previously allowed", __func__);
2980ea68 1347 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
ff2d7a98 1348 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
2980ea68 1349 if ((key = key_from_blob(blob, blen)) == NULL)
ff2d7a98 1350 fatal("%s: received bad key", __func__);
2980ea68 1351 response = buffer_get_string(m, &len);
1352 if (len != 16)
ff2d7a98 1353 fatal("%s: received bad response to challenge", __func__);
2980ea68 1354 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1355
1c14df9e 1356 xfree(blob);
2980ea68 1357 key_free(key);
1358 xfree(response);
1359
1360 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1361
1362 /* reset state */
1363 BN_clear_free(ssh1_challenge);
1364 ssh1_challenge = NULL;
1365 monitor_reset_key_state();
1366
1367 buffer_clear(m);
1368 buffer_put_int(m, success);
1369 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1370
1371 return (success);
1372}
1373
e54b3d7c 1374#ifdef KRB4
1375int
1376mm_answer_krb4(int socket, Buffer *m)
1377{
1378 KTEXT_ST auth, reply;
1379 char *client, *p;
1380 int success;
1381 u_int alen;
1382
1383 reply.length = auth.length = 0;
1384
1385 p = buffer_get_string(m, &alen);
1386 if (alen >= MAX_KTXT_LEN)
1387 fatal("%s: auth too large", __func__);
1388 memcpy(auth.dat, p, alen);
1389 auth.length = alen;
1390 memset(p, 0, alen);
1391 xfree(p);
1392
1393 success = options.kerberos_authentication &&
1394 authctxt->valid &&
1395 auth_krb4(authctxt, &auth, &client, &reply);
1396
1397 memset(auth.dat, 0, alen);
1398 buffer_clear(m);
1399 buffer_put_int(m, success);
1400
1401 if (success) {
1402 buffer_put_cstring(m, client);
1403 buffer_put_string(m, reply.dat, reply.length);
1404 if (client)
1405 xfree(client);
1406 if (reply.length)
1407 memset(reply.dat, 0, reply.length);
1408 }
1409
1410 debug3("%s: sending result %d", __func__, success);
1411 mm_request_send(socket, MONITOR_ANS_KRB4, m);
1412
1413 auth_method = "kerberos";
1414
1415 /* Causes monitor loop to terminate if authenticated */
1416 return (success);
1417}
1418#endif
1419
1420#ifdef KRB5
1421int
1422mm_answer_krb5(int socket, Buffer *m)
1423{
1424 krb5_data tkt, reply;
1425 char *client_user;
1426 u_int len;
1427 int success;
1428
1429 /* use temporary var to avoid size issues on 64bit arch */
1430 tkt.data = buffer_get_string(m, &len);
1431 tkt.length = len;
1432
1433 success = options.kerberos_authentication &&
1434 authctxt->valid &&
1435 auth_krb5(authctxt, &tkt, &client_user, &reply);
1436
1437 if (tkt.length)
1438 xfree(tkt.data);
1439
1440 buffer_clear(m);
1441 buffer_put_int(m, success);
1442
1443 if (success) {
1444 buffer_put_cstring(m, client_user);
1445 buffer_put_string(m, reply.data, reply.length);
1446 if (client_user)
1447 xfree(client_user);
1448 if (reply.length)
1449 xfree(reply.data);
1450 }
1451 mm_request_send(socket, MONITOR_ANS_KRB5, m);
1452
1453 return success;
1454}
1455#endif
1456
2980ea68 1457int
1458mm_answer_term(int socket, Buffer *req)
1459{
1460 extern struct monitor *pmonitor;
1461 int res, status;
1462
ff2d7a98 1463 debug3("%s: tearing down sessions", __func__);
2980ea68 1464
1465 /* The child is terminating */
1466 session_destroy_all(&mm_session_close);
1467
1468 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1469 if (errno != EINTR)
1470 exit(1);
1471
1472 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1473
1474 /* Terminate process */
1475 exit (res);
1476}
1477
1478void
1479monitor_apply_keystate(struct monitor *pmonitor)
1480{
1481 if (compat20) {
1482 set_newkeys(MODE_IN);
1483 set_newkeys(MODE_OUT);
1484 } else {
2980ea68 1485 packet_set_protocol_flags(child_state.ssh1protoflags);
ff2d7a98 1486 packet_set_encryption_key(child_state.ssh1key,
1487 child_state.ssh1keylen, child_state.ssh1cipher);
1488 xfree(child_state.ssh1key);
2980ea68 1489 }
1490
ff2d7a98 1491 /* for rc4 and other stateful ciphers */
2980ea68 1492 packet_set_keycontext(MODE_OUT, child_state.keyout);
1493 xfree(child_state.keyout);
1494 packet_set_keycontext(MODE_IN, child_state.keyin);
1495 xfree(child_state.keyin);
1496
1497 if (!compat20) {
1498 packet_set_iv(MODE_OUT, child_state.ivout);
1499 xfree(child_state.ivout);
1500 packet_set_iv(MODE_IN, child_state.ivin);
1501 xfree(child_state.ivin);
1502 }
1503
1504 memcpy(&incoming_stream, &child_state.incoming,
1505 sizeof(incoming_stream));
1506 memcpy(&outgoing_stream, &child_state.outgoing,
1507 sizeof(outgoing_stream));
1508
1509 /* Update with new address */
ff2d7a98 1510 if (options.compression)
1511 mm_init_compression(pmonitor->m_zlib);
2980ea68 1512
1513 /* Network I/O buffers */
1514 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1515 buffer_clear(&input);
1516 buffer_append(&input, child_state.input, child_state.ilen);
1517 memset(child_state.input, 0, child_state.ilen);
1518 xfree(child_state.input);
1519
1520 buffer_clear(&output);
1521 buffer_append(&output, child_state.output, child_state.olen);
1522 memset(child_state.output, 0, child_state.olen);
1523 xfree(child_state.output);
1524}
1525
1526static Kex *
1527mm_get_kex(Buffer *m)
1528{
1529 Kex *kex;
1530 void *blob;
1531 u_int bloblen;
1532
1533 kex = xmalloc(sizeof(*kex));
1534 memset(kex, 0, sizeof(*kex));
1535 kex->session_id = buffer_get_string(m, &kex->session_id_len);
ff2d7a98 1536 if ((session_id2 == NULL) ||
1537 (kex->session_id_len != session_id2_len) ||
1538 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1539 fatal("mm_get_get: internal error: bad session id");
2980ea68 1540 kex->we_need = buffer_get_int(m);
1c14df9e 1541 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1542 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
88928908 1543#ifdef GSSAPI
1544 kex->kex[KEX_GSS_GRP1_SHA1] =kexgss_server;
1545#endif
2980ea68 1546 kex->server = 1;
1547 kex->hostkey_type = buffer_get_int(m);
1548 kex->kex_type = buffer_get_int(m);
1549 blob = buffer_get_string(m, &bloblen);
1550 buffer_init(&kex->my);
1551 buffer_append(&kex->my, blob, bloblen);
1552 xfree(blob);
1553 blob = buffer_get_string(m, &bloblen);
1554 buffer_init(&kex->peer);
1555 buffer_append(&kex->peer, blob, bloblen);
1556 xfree(blob);
1557 kex->done = 1;
1558 kex->flags = buffer_get_int(m);
1559 kex->client_version_string = buffer_get_string(m, NULL);
1560 kex->server_version_string = buffer_get_string(m, NULL);
1561 kex->load_host_key=&get_hostkey_by_type;
1562 kex->host_key_index=&get_hostkey_index;
1563
1564 return (kex);
1565}
1566
1567/* This function requries careful sanity checking */
1568
1569void
1570mm_get_keystate(struct monitor *pmonitor)
1571{
1572 Buffer m;
1573 u_char *blob, *p;
1574 u_int bloblen, plen;
1575
ff2d7a98 1576 debug3("%s: Waiting for new keys", __func__);
2980ea68 1577
1578 buffer_init(&m);
1579 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1580 if (!compat20) {
1581 child_state.ssh1protoflags = buffer_get_int(&m);
1582 child_state.ssh1cipher = buffer_get_int(&m);
ff2d7a98 1583 child_state.ssh1key = buffer_get_string(&m,
1584 &child_state.ssh1keylen);
2980ea68 1585 child_state.ivout = buffer_get_string(&m,
1586 &child_state.ivoutlen);
1587 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1588 goto skip;
1589 } else {
1590 /* Get the Kex for rekeying */
1591 *pmonitor->m_pkex = mm_get_kex(&m);
1592 }
1593
1594 blob = buffer_get_string(&m, &bloblen);
1595 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1596 xfree(blob);
1597
ff2d7a98 1598 debug3("%s: Waiting for second key", __func__);
2980ea68 1599 blob = buffer_get_string(&m, &bloblen);
1600 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1601 xfree(blob);
1602
1603 /* Now get sequence numbers for the packets */
1604 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1605 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1606
1607 skip:
1608 /* Get the key context */
1609 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1610 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1611
ff2d7a98 1612 debug3("%s: Getting compression state", __func__);
2980ea68 1613 /* Get compression state */
1614 p = buffer_get_string(&m, &plen);
1615 if (plen != sizeof(child_state.outgoing))
ff2d7a98 1616 fatal("%s: bad request size", __func__);
2980ea68 1617 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1618 xfree(p);
1619
1620 p = buffer_get_string(&m, &plen);
1621 if (plen != sizeof(child_state.incoming))
ff2d7a98 1622 fatal("%s: bad request size", __func__);
2980ea68 1623 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1624 xfree(p);
1625
1626 /* Network I/O buffers */
ff2d7a98 1627 debug3("%s: Getting Network I/O buffers", __func__);
2980ea68 1628 child_state.input = buffer_get_string(&m, &child_state.ilen);
1629 child_state.output = buffer_get_string(&m, &child_state.olen);
1630
1631 buffer_free(&m);
1632}
1633
1634
1635/* Allocation functions for zlib */
1636void *
1637mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1638{
1c14df9e 1639 size_t len = (size_t) size * ncount;
2980ea68 1640 void *address;
1641
e54b3d7c 1642 if (len == 0 || ncount > SIZE_T_MAX / size)
ff2d7a98 1643 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1644
1645 address = mm_malloc(mm, len);
2980ea68 1646
1647 return (address);
1648}
1649
1650void
1651mm_zfree(struct mm_master *mm, void *address)
1652{
1653 mm_free(mm, address);
1654}
1655
1656void
1657mm_init_compression(struct mm_master *mm)
1658{
1659 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1660 outgoing_stream.zfree = (free_func)mm_zfree;
1661 outgoing_stream.opaque = mm;
1662
1663 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1664 incoming_stream.zfree = (free_func)mm_zfree;
1665 incoming_stream.opaque = mm;
1666}
1667
1668/* XXX */
1669
1670#define FD_CLOSEONEXEC(x) do { \
1671 if (fcntl(x, F_SETFD, 1) == -1) \
1672 fatal("fcntl(%d, F_SETFD)", x); \
1673} while (0)
1674
1675static void
1676monitor_socketpair(int *pair)
1677{
1678#ifdef HAVE_SOCKETPAIR
1679 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
ff2d7a98 1680 fatal("%s: socketpair", __func__);
2980ea68 1681#else
1682 fatal("%s: UsePrivilegeSeparation=yes not supported",
ff2d7a98 1683 __func__);
2980ea68 1684#endif
1685 FD_CLOSEONEXEC(pair[0]);
1686 FD_CLOSEONEXEC(pair[1]);
1687}
1688
1689#define MM_MEMSIZE 65536
1690
1691struct monitor *
1692monitor_init(void)
1693{
1694 struct monitor *mon;
1695 int pair[2];
1696
1697 mon = xmalloc(sizeof(*mon));
1698
1699 monitor_socketpair(pair);
1700
1701 mon->m_recvfd = pair[0];
1702 mon->m_sendfd = pair[1];
1703
1704 /* Used to share zlib space across processes */
ff2d7a98 1705 if (options.compression) {
1706 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1707 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
2980ea68 1708
ff2d7a98 1709 /* Compression needs to share state across borders */
1710 mm_init_compression(mon->m_zlib);
1711 }
2980ea68 1712
1713 return mon;
1714}
1715
1716void
1717monitor_reinit(struct monitor *mon)
1718{
1719 int pair[2];
1720
1721 monitor_socketpair(pair);
1722
1723 mon->m_recvfd = pair[0];
1724 mon->m_sendfd = pair[1];
1725}
ff2d7a98 1726
1727#ifdef GSSAPI
1728
1729int
1730mm_answer_gss_setup_ctx(int socket, Buffer *m) {
1731 gss_OID_desc oid;
1732 OM_uint32 major;
c2397a66 1733 int len;
ff2d7a98 1734
c2397a66 1735 oid.elements=buffer_get_string(m,&len);
1736 oid.length=len;
ff2d7a98 1737
1738 major=ssh_gssapi_server_ctx(&gsscontext,&oid);
1739
1740 xfree(oid.elements);
1741
1742 buffer_clear(m);
1743 buffer_put_int(m,major);
1744
1745 mm_request_send(socket,MONITOR_ANS_GSSSETUP,m);
1746
88928908 1747 /* Now we have a context, enable the step and sign */
1748 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP,1);
1749
ff2d7a98 1750 return(0);
1751}
1752
1753int
1754mm_answer_gss_accept_ctx(int socket, Buffer *m) {
1755 gss_buffer_desc in,out;
1756 OM_uint32 major,minor;
1757 OM_uint32 flags = 0; /* GSI needs this */
1758
1759 in.value = buffer_get_string(m,&in.length);
1760 major=ssh_gssapi_accept_ctx(gsscontext,&in,&out,&flags);
1761 xfree(in.value);
1762
1763 buffer_clear(m);
1764 buffer_put_int(m, major);
1765 buffer_put_string(m, out.value, out.length);
1766 buffer_put_int(m, flags);
1767 mm_request_send(socket,MONITOR_ANS_GSSSTEP,m);
1768
1769 gss_release_buffer(&minor, &out);
1770
88928908 1771 /* Complete - now we can do signing */
1772 if (major==GSS_S_COMPLETE) {
1773 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP,0);
1774 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN,1);
1775 }
ff2d7a98 1776 return(0);
1777}
88928908 1778
ff2d7a98 1779int
1780mm_answer_gss_userok(int socket, Buffer *m) {
1781 int authenticated;
1782
1783 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1784
1785 buffer_clear(m);
1786 buffer_put_int(m, authenticated);
1787
1788 debug3("%s: sending result %d", __func__, authenticated);
1789 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
1790
88928908 1791 /* XXX - auth method could also be 'external' */
ff2d7a98 1792 auth_method="gssapi";
1793
1794 /* Monitor loop will terminate if authenticated */
1795 return(authenticated);
1796}
ff2d7a98 1797
1798int
1799mm_answer_gss_sign(int socket, Buffer *m) {
1800 gss_buffer_desc data,hash;
1801 OM_uint32 major,minor;
1802
1803 data.value = buffer_get_string(m,&data.length);
1804 if (data.length != 16) { /* HACK - i.e. we are using SSHv1 */
1805 if (data.length != 20)
1806 fatal("%s: data length incorrect: %d", __func__, data.length);
1807
1808 /* Save the session ID - only first time round */
1809 if (session_id2_len == 0) {
1810 session_id2_len=data.length;
1811 session_id2 = xmalloc(session_id2_len);
1812 memcpy(session_id2, data.value, session_id2_len);
1813 }
1814 } /* HACK - end */
1815 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1816
1817 xfree(data.value);
1818
1819 buffer_clear(m);
1820 buffer_put_int(m, major);
1821 buffer_put_string(m, hash.value, hash.length);
1822
1823 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1824
1825 gss_release_buffer(&minor,&hash);
1826
1827 /* Turn on permissions for getpwnam */
1828 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1829
1830 return(0);
1831}
1832
88928908 1833int
1834mm_answer_gss_error(int socket, Buffer *m) {
1835 OM_uint32 major,minor;
1836 char *msg;
1837
1838 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
1839 buffer_clear(m);
1840 buffer_put_int(m,major);
1841 buffer_put_int(m,minor);
1842 buffer_put_cstring(m,msg);
1843
1844 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
1845
1846 xfree(msg);
1847
1848 return(0);
1849}
1850
98f19977 1851int
1852mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
1853 OM_uint32 major,minor;
1854 gss_OID_set mech_set;
1855 int i;
1856
1857 major=gss_indicate_mechs(&minor, &mech_set);
1858
1859 buffer_clear(m);
1860 buffer_put_int(m, major);
1861 buffer_put_int(m, mech_set->count);
1862 for (i=0; i < mech_set->count; i++) {
1863 buffer_put_string(m, mech_set->elements[i].elements,
1864 mech_set->elements[i].length);
1865 }
1866
88928908 1867#if !defined(MECHGLUE) /* mechglue memory management bug ??? */
1868 gss_release_oid_set(&minor,&mech_set);
1869#endif
1870
98f19977 1871 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
1872
1873 return(0);
1874}
1875
1876int
88928908 1877mm_answer_gss_localname(int socket, Buffer *m) {
1878 char *name;
98f19977 1879
88928908 1880 ssh_gssapi_localname(&name);
98f19977 1881
88928908 1882 buffer_clear(m);
1883 if (name) {
1884 buffer_put_cstring(m, name);
1885 debug3("%s: sending result %s", __func__, name);
1886 xfree(name);
1887 } else {
1888 buffer_put_cstring(m, "");
1889 debug3("%s: sending result \"\"", __func__);
98f19977 1890 }
1891
88928908 1892 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);
98f19977 1893
88928908 1894 return(0);
1895}
ff2d7a98 1896#endif /* GSSAPI */
1897
1898#ifdef GSI
1899
1900int
1901mm_answer_gsi_gridmap(int socket, Buffer *m) {
1902 char *subject, *name;
1903
1904 subject = buffer_get_string(m, NULL);
1905
1906 gsi_gridmap(subject, &name);
1907
1908 buffer_clear(m);
1909 if (name) {
1910 buffer_put_cstring(m, name);
1911 debug3("%s: sending result %s", __func__, name);
1912 xfree(name);
1913 } else {
1914 buffer_put_cstring(m, "");
1915 debug3("%s: sending result \"\"", __func__);
1916 }
1917
1918 mm_request_send(socket, MONITOR_ANS_GSIGRIDMAP, m);
1919
1920 return(0);
1921}
1922
1923#endif /* GSI */
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