blob: 009dcf18256b95965857f2fc5841dccdc1ad30b1 [file] [log] [blame]
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001/*
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"
Darren Tuckera8be9e22004-02-06 16:40:27 +110028RCSID("$OpenBSD: monitor.c,v 1.55 2004/02/05 05:37:17 dtucker Exp $");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000029
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
Darren Tucker0efd1552003-08-26 11:49:55 +100062#ifdef GSSAPI
63#include "ssh-gss.h"
64static Gssctxt *gsscontext = NULL;
65#endif
66
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000067/* 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;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +000091 u_char *ssh1key;
92 u_int ssh1keylen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000093 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
Damien Miller469954d2003-06-18 20:25:33 +1000101/* Functions on the monitor that answer unprivileged requests */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000102
103int mm_answer_moduli(int, Buffer *);
104int mm_answer_sign(int, Buffer *);
105int mm_answer_pwnamallow(int, Buffer *);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000106int mm_answer_auth2_read_banner(int, Buffer *);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000107int 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
Damien Miller79418552002-04-23 20:28:48 +1000124#ifdef USE_PAM
125int mm_answer_pam_start(int, Buffer *);
Damien Miller1f499fd2003-08-25 13:08:49 +1000126int mm_answer_pam_account(int, Buffer *);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000127int mm_answer_pam_init_ctx(int, Buffer *);
128int mm_answer_pam_query(int, Buffer *);
129int mm_answer_pam_respond(int, Buffer *);
130int mm_answer_pam_free_ctx(int, Buffer *);
Damien Miller79418552002-04-23 20:28:48 +1000131#endif
132
Darren Tucker0efd1552003-08-26 11:49:55 +1000133#ifdef GSSAPI
134int mm_answer_gss_setup_ctx(int, Buffer *);
135int mm_answer_gss_accept_ctx(int, Buffer *);
136int mm_answer_gss_userok(int, Buffer *);
Damien Miller0425d402003-11-17 22:18:21 +1100137int mm_answer_gss_checkmic(int, Buffer *);
Darren Tucker0efd1552003-08-26 11:49:55 +1000138#endif
Damien Miller25162f22002-09-12 09:47:29 +1000139
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000140static Authctxt *authctxt;
141static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
142
143/* local state for key verify */
144static u_char *key_blob = NULL;
145static u_int key_bloblen = 0;
146static int key_blobtype = MM_NOKEY;
Damien Millera10f5612002-09-12 09:49:15 +1000147static char *hostbased_cuser = NULL;
148static char *hostbased_chost = NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000149static char *auth_method = "unknown";
Darren Tucker502d3842003-06-28 12:38:01 +1000150static u_int session_id2_len = 0;
Ben Lindstromf67e0772002-06-06 20:58:19 +0000151static u_char *session_id2 = NULL;
Damien Millerbe64d432003-05-14 19:31:12 +1000152static pid_t monitor_child_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000153
154struct mon_table {
155 enum monitor_reqtype type;
156 int flags;
157 int (*f)(int, Buffer *);
158};
159
160#define MON_ISAUTH 0x0004 /* Required for Authentication */
161#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
162#define MON_ONCE 0x0010 /* Disable after calling */
163
164#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
165
166#define MON_PERMIT 0x1000 /* Request is permitted */
167
168struct mon_table mon_dispatch_proto20[] = {
169 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
170 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
171 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
172 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
Damien Miller5ad9fd92002-05-13 11:07:41 +1000173 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000174 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller79418552002-04-23 20:28:48 +1000175#ifdef USE_PAM
176 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000177 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000178 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
179 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
180 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
181 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Kevin Stevesbd1901b2002-04-01 18:04:35 +0000182#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000183#ifdef BSD_AUTH
184 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
185 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
186#endif
187#ifdef SKEY
188 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
189 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
190#endif
191 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
192 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
Darren Tucker0efd1552003-08-26 11:49:55 +1000193#ifdef GSSAPI
194 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
195 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
196 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
Damien Miller0425d402003-11-17 22:18:21 +1100197 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
Darren Tucker0efd1552003-08-26 11:49:55 +1000198#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000199 {0, 0, NULL}
200};
201
202struct mon_table mon_dispatch_postauth20[] = {
203 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
204 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
205 {MONITOR_REQ_PTY, 0, mm_answer_pty},
206 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
207 {MONITOR_REQ_TERM, 0, mm_answer_term},
208 {0, 0, NULL}
209};
210
211struct mon_table mon_dispatch_proto15[] = {
212 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
213 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
214 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
215 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
216 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
217 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
218 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
219 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
220#ifdef BSD_AUTH
221 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
222 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
223#endif
224#ifdef SKEY
225 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
226 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
227#endif
Damien Millera33501b2002-05-08 12:24:42 +1000228#ifdef USE_PAM
229 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000230 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000231 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
232 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
233 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
234 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Damien Millera33501b2002-05-08 12:24:42 +1000235#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000236 {0, 0, NULL}
237};
238
239struct mon_table mon_dispatch_postauth15[] = {
240 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
241 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
242 {MONITOR_REQ_TERM, 0, mm_answer_term},
243 {0, 0, NULL}
244};
245
246struct mon_table *mon_dispatch;
247
248/* Specifies if a certain message is allowed at the moment */
249
250static void
251monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
252{
253 while (ent->f != NULL) {
254 if (ent->type == type) {
255 ent->flags &= ~MON_PERMIT;
256 ent->flags |= permit ? MON_PERMIT : 0;
257 return;
258 }
259 ent++;
260 }
261}
262
263static void
264monitor_permit_authentications(int permit)
265{
266 struct mon_table *ent = mon_dispatch;
267
268 while (ent->f != NULL) {
269 if (ent->flags & MON_AUTH) {
270 ent->flags &= ~MON_PERMIT;
271 ent->flags |= permit ? MON_PERMIT : 0;
272 }
273 ent++;
274 }
275}
276
Darren Tucker3e33cec2003-10-02 16:12:36 +1000277void
278monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000279{
280 struct mon_table *ent;
281 int authenticated = 0;
282
283 debug3("preauth child monitor started");
284
Darren Tucker3e33cec2003-10-02 16:12:36 +1000285 authctxt = _authctxt;
286 memset(authctxt, 0, sizeof(*authctxt));
287
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000288 if (compat20) {
289 mon_dispatch = mon_dispatch_proto20;
290
291 /* Permit requests for moduli and signatures */
292 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
293 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
294 } else {
295 mon_dispatch = mon_dispatch_proto15;
296
297 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
298 }
299
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000300 /* The first few requests do not require asynchronous access */
301 while (!authenticated) {
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000302 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000303 if (authenticated) {
304 if (!(ent->flags & MON_AUTHDECIDE))
305 fatal("%s: unexpected authentication from %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000306 __func__, ent->type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000307 if (authctxt->pw->pw_uid == 0 &&
308 !auth_root_allowed(auth_method))
309 authenticated = 0;
Damien Miller1f499fd2003-08-25 13:08:49 +1000310#ifdef USE_PAM
311 /* PAM needs to perform account checks after auth */
Damien Miller6aef38f2003-11-18 10:45:20 +1100312 if (options.use_pam && authenticated) {
Damien Miller1f499fd2003-08-25 13:08:49 +1000313 Buffer m;
314
315 buffer_init(&m);
Damien Millera8e06ce2003-11-21 23:48:55 +1100316 mm_request_receive_expect(pmonitor->m_sendfd,
Damien Miller1f499fd2003-08-25 13:08:49 +1000317 MONITOR_REQ_PAM_ACCOUNT, &m);
318 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
319 buffer_free(&m);
320 }
321#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000322 }
323
324 if (ent->flags & MON_AUTHDECIDE) {
325 auth_log(authctxt, authenticated, auth_method,
326 compat20 ? " ssh2" : "");
327 if (!authenticated)
328 authctxt->failures++;
329 }
330 }
331
332 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000333 fatal("%s: authenticated invalid user", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000334
335 debug("%s: %s has been authenticated by privileged process",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000336 __func__, authctxt->user);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000337
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000338 mm_get_keystate(pmonitor);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000339}
340
Damien Millerbe64d432003-05-14 19:31:12 +1000341static void
342monitor_set_child_handler(pid_t pid)
343{
344 monitor_child_pid = pid;
345}
346
347static void
348monitor_child_handler(int signal)
349{
350 kill(monitor_child_pid, signal);
351}
352
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000353void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000354monitor_child_postauth(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000355{
Damien Millerbe64d432003-05-14 19:31:12 +1000356 monitor_set_child_handler(pmonitor->m_pid);
357 signal(SIGHUP, &monitor_child_handler);
358 signal(SIGTERM, &monitor_child_handler);
359
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000360 if (compat20) {
361 mon_dispatch = mon_dispatch_postauth20;
362
363 /* Permit requests for moduli and signatures */
364 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
365 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
366 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000367 } else {
368 mon_dispatch = mon_dispatch_postauth15;
369 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
370 }
371 if (!no_pty_flag) {
372 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
373 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
374 }
375
376 for (;;)
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000377 monitor_read(pmonitor, mon_dispatch, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000378}
379
380void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000381monitor_sync(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000382{
Damien Miller2d6b8332002-06-21 15:59:49 +1000383 if (options.compression) {
384 /* The member allocation is not visible, so sync it */
385 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
386 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000387}
388
389int
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000390monitor_read(struct monitor *pmonitor, struct mon_table *ent,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000391 struct mon_table **pent)
392{
393 Buffer m;
394 int ret;
395 u_char type;
396
397 buffer_init(&m);
398
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000399 mm_request_receive(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000400 type = buffer_get_char(&m);
401
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000402 debug3("%s: checking request %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000403
404 while (ent->f != NULL) {
405 if (ent->type == type)
406 break;
407 ent++;
408 }
409
410 if (ent->f != NULL) {
411 if (!(ent->flags & MON_PERMIT))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000412 fatal("%s: unpermitted request %d", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000413 type);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000414 ret = (*ent->f)(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000415 buffer_free(&m);
416
417 /* The child may use this request only once, disable it */
418 if (ent->flags & MON_ONCE) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000419 debug2("%s: %d used once, disabling now", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000420 type);
421 ent->flags &= ~MON_PERMIT;
422 }
423
424 if (pent != NULL)
425 *pent = ent;
426
427 return ret;
428 }
429
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000430 fatal("%s: unsupported request: %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000431
432 /* NOTREACHED */
433 return (-1);
434}
435
436/* allowed key state */
437static int
438monitor_allowed_key(u_char *blob, u_int bloblen)
439{
440 /* make sure key is allowed */
441 if (key_blob == NULL || key_bloblen != bloblen ||
442 memcmp(key_blob, blob, key_bloblen))
443 return (0);
444 return (1);
445}
446
447static void
448monitor_reset_key_state(void)
449{
450 /* reset state */
451 if (key_blob != NULL)
452 xfree(key_blob);
453 if (hostbased_cuser != NULL)
454 xfree(hostbased_cuser);
455 if (hostbased_chost != NULL)
456 xfree(hostbased_chost);
457 key_blob = NULL;
458 key_bloblen = 0;
459 key_blobtype = MM_NOKEY;
460 hostbased_cuser = NULL;
461 hostbased_chost = NULL;
462}
463
464int
465mm_answer_moduli(int socket, Buffer *m)
466{
467 DH *dh;
468 int min, want, max;
469
470 min = buffer_get_int(m);
471 want = buffer_get_int(m);
472 max = buffer_get_int(m);
473
474 debug3("%s: got parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000475 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000476 /* We need to check here, too, in case the child got corrupted */
477 if (max < min || want < min || max < want)
478 fatal("%s: bad parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000479 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000480
481 buffer_clear(m);
482
483 dh = choose_dh(min, want, max);
484 if (dh == NULL) {
485 buffer_put_char(m, 0);
486 return (0);
487 } else {
488 /* Send first bignum */
489 buffer_put_char(m, 1);
490 buffer_put_bignum2(m, dh->p);
491 buffer_put_bignum2(m, dh->g);
492
493 DH_free(dh);
494 }
495 mm_request_send(socket, MONITOR_ANS_MODULI, m);
496 return (0);
497}
498
499int
500mm_answer_sign(int socket, Buffer *m)
501{
502 Key *key;
503 u_char *p;
504 u_char *signature;
505 u_int siglen, datlen;
506 int keyid;
507
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000508 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000509
510 keyid = buffer_get_int(m);
511 p = buffer_get_string(m, &datlen);
512
513 if (datlen != 20)
Ben Lindstromd5502182002-06-27 00:12:57 +0000514 fatal("%s: data length incorrect: %u", __func__, datlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000515
Ben Lindstromf67e0772002-06-06 20:58:19 +0000516 /* save session id, it will be passed on the first call */
517 if (session_id2_len == 0) {
518 session_id2_len = datlen;
519 session_id2 = xmalloc(session_id2_len);
520 memcpy(session_id2, p, session_id2_len);
521 }
522
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000523 if ((key = get_hostkey_by_index(keyid)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000524 fatal("%s: no hostkey from index %d", __func__, keyid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000525 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000526 fatal("%s: key_sign failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000527
Ben Lindstromd5502182002-06-27 00:12:57 +0000528 debug3("%s: signature %p(%u)", __func__, signature, siglen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000529
530 buffer_clear(m);
531 buffer_put_string(m, signature, siglen);
532
533 xfree(p);
534 xfree(signature);
535
536 mm_request_send(socket, MONITOR_ANS_SIGN, m);
537
538 /* Turn on permissions for getpwnam */
539 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
540
541 return (0);
542}
543
544/* Retrieves the password entry and also checks if the user is permitted */
545
546int
547mm_answer_pwnamallow(int socket, Buffer *m)
548{
549 char *login;
550 struct passwd *pwent;
551 int allowed = 0;
552
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000553 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000554
555 if (authctxt->attempt++ != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000556 fatal("%s: multiple attempts for getpwnam", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000557
558 login = buffer_get_string(m, NULL);
559
560 pwent = getpwnamallow(login);
561
562 authctxt->user = xstrdup(login);
563 setproctitle("%s [priv]", pwent ? login : "unknown");
564 xfree(login);
565
566 buffer_clear(m);
567
568 if (pwent == NULL) {
569 buffer_put_char(m, 0);
Damien Millerf96d1832003-11-18 22:01:48 +1100570 authctxt->pw = fakepw();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000571 goto out;
572 }
573
574 allowed = 1;
575 authctxt->pw = pwent;
576 authctxt->valid = 1;
577
578 buffer_put_char(m, 1);
579 buffer_put_string(m, pwent, sizeof(struct passwd));
580 buffer_put_cstring(m, pwent->pw_name);
581 buffer_put_cstring(m, "*");
582 buffer_put_cstring(m, pwent->pw_gecos);
Kevin Steves7e147602002-03-22 18:07:17 +0000583#ifdef HAVE_PW_CLASS_IN_PASSWD
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000584 buffer_put_cstring(m, pwent->pw_class);
Kevin Steves7e147602002-03-22 18:07:17 +0000585#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000586 buffer_put_cstring(m, pwent->pw_dir);
587 buffer_put_cstring(m, pwent->pw_shell);
588
589 out:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000590 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000591 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
592
593 /* For SSHv1 allow authentication now */
594 if (!compat20)
595 monitor_permit_authentications(1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000596 else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000597 /* Allow service/style information on the auth context */
598 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000599 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
600 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000601
Damien Millera33501b2002-05-08 12:24:42 +1000602#ifdef USE_PAM
Damien Miller4e448a32003-05-14 15:11:48 +1000603 if (options.use_pam)
604 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
Damien Millera33501b2002-05-08 12:24:42 +1000605#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000606
607 return (0);
608}
609
Damien Miller5ad9fd92002-05-13 11:07:41 +1000610int mm_answer_auth2_read_banner(int socket, Buffer *m)
611{
612 char *banner;
613
614 buffer_clear(m);
615 banner = auth2_read_banner();
616 buffer_put_cstring(m, banner != NULL ? banner : "");
617 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
618
619 if (banner != NULL)
Ben Lindstromeec16fc2002-07-04 00:06:15 +0000620 xfree(banner);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000621
622 return (0);
623}
624
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000625int
626mm_answer_authserv(int socket, Buffer *m)
627{
628 monitor_permit_authentications(1);
629
630 authctxt->service = buffer_get_string(m, NULL);
631 authctxt->style = buffer_get_string(m, NULL);
632 debug3("%s: service=%s, style=%s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000633 __func__, authctxt->service, authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000634
635 if (strlen(authctxt->style) == 0) {
636 xfree(authctxt->style);
637 authctxt->style = NULL;
638 }
639
640 return (0);
641}
642
643int
644mm_answer_authpassword(int socket, Buffer *m)
645{
646 static int call_count;
647 char *passwd;
Ben Lindstrom7cea16b2002-07-23 21:13:40 +0000648 int authenticated;
649 u_int plen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000650
651 passwd = buffer_get_string(m, &plen);
652 /* Only authenticate if the context is valid */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000653 authenticated = options.password_authentication &&
Damien Miller856f0be2003-09-03 07:32:45 +1000654 auth_password(authctxt, passwd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000655 memset(passwd, 0, strlen(passwd));
656 xfree(passwd);
657
658 buffer_clear(m);
659 buffer_put_int(m, authenticated);
660
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000661 debug3("%s: sending result %d", __func__, authenticated);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000662 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
663
664 call_count++;
665 if (plen == 0 && call_count == 1)
666 auth_method = "none";
667 else
668 auth_method = "password";
669
670 /* Causes monitor loop to terminate if authenticated */
671 return (authenticated);
672}
673
674#ifdef BSD_AUTH
675int
676mm_answer_bsdauthquery(int socket, Buffer *m)
677{
678 char *name, *infotxt;
679 u_int numprompts;
680 u_int *echo_on;
681 char **prompts;
Damien Millerb7df3af2003-02-24 11:55:46 +1100682 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000683
Damien Millerb7df3af2003-02-24 11:55:46 +1100684 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
685 &prompts, &echo_on) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000686
687 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100688 buffer_put_int(m, success);
689 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000690 buffer_put_cstring(m, prompts[0]);
691
Damien Millerb7df3af2003-02-24 11:55:46 +1100692 debug3("%s: sending challenge success: %u", __func__, success);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000693 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
694
Damien Millerb7df3af2003-02-24 11:55:46 +1100695 if (success) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000696 xfree(name);
697 xfree(infotxt);
698 xfree(prompts);
699 xfree(echo_on);
700 }
701
702 return (0);
703}
704
705int
706mm_answer_bsdauthrespond(int socket, Buffer *m)
707{
708 char *response;
709 int authok;
710
711 if (authctxt->as == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000712 fatal("%s: no bsd auth session", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000713
714 response = buffer_get_string(m, NULL);
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000715 authok = options.challenge_response_authentication &&
716 auth_userresponse(authctxt->as, response, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000717 authctxt->as = NULL;
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000718 debug3("%s: <%s> = <%d>", __func__, response, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000719 xfree(response);
720
721 buffer_clear(m);
722 buffer_put_int(m, authok);
723
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000724 debug3("%s: sending authenticated: %d", __func__, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000725 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
726
727 auth_method = "bsdauth";
728
729 return (authok != 0);
730}
731#endif
732
733#ifdef SKEY
734int
735mm_answer_skeyquery(int socket, Buffer *m)
736{
737 struct skey skey;
738 char challenge[1024];
Damien Millerb7df3af2003-02-24 11:55:46 +1100739 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000740
Damien Millerb7df3af2003-02-24 11:55:46 +1100741 success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000742
743 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100744 buffer_put_int(m, success);
745 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000746 buffer_put_cstring(m, challenge);
747
Damien Millerb7df3af2003-02-24 11:55:46 +1100748 debug3("%s: sending challenge success: %u", __func__, success);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000749 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
750
751 return (0);
752}
753
754int
755mm_answer_skeyrespond(int socket, Buffer *m)
756{
757 char *response;
758 int authok;
759
760 response = buffer_get_string(m, NULL);
761
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000762 authok = (options.challenge_response_authentication &&
763 authctxt->valid &&
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000764 skey_haskey(authctxt->pw->pw_name) == 0 &&
765 skey_passcheck(authctxt->pw->pw_name, response) != -1);
766
767 xfree(response);
768
769 buffer_clear(m);
770 buffer_put_int(m, authok);
771
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000772 debug3("%s: sending authenticated: %d", __func__, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000773 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
774
775 auth_method = "skey";
776
777 return (authok != 0);
778}
779#endif
780
Damien Miller79418552002-04-23 20:28:48 +1000781#ifdef USE_PAM
782int
783mm_answer_pam_start(int socket, Buffer *m)
784{
785 char *user;
Damien Miller787b2ec2003-11-21 23:56:47 +1100786
Damien Miller4e448a32003-05-14 15:11:48 +1000787 if (!options.use_pam)
788 fatal("UsePAM not set, but ended up in %s anyway", __func__);
789
Damien Miller79418552002-04-23 20:28:48 +1000790 user = buffer_get_string(m, NULL);
791
792 start_pam(user);
793
794 xfree(user);
795
Damien Miller1f499fd2003-08-25 13:08:49 +1000796 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
797
Damien Miller79418552002-04-23 20:28:48 +1000798 return (0);
799}
Damien Miller4f9f42a2003-05-10 19:28:02 +1000800
Damien Miller1f499fd2003-08-25 13:08:49 +1000801int
802mm_answer_pam_account(int socket, Buffer *m)
803{
804 u_int ret;
Damien Miller787b2ec2003-11-21 23:56:47 +1100805
Damien Miller1f499fd2003-08-25 13:08:49 +1000806 if (!options.use_pam)
807 fatal("UsePAM not set, but ended up in %s anyway", __func__);
808
809 ret = do_pam_account();
810
811 buffer_put_int(m, ret);
812
813 mm_request_send(socket, MONITOR_ANS_PAM_ACCOUNT, m);
814
815 return (ret);
816}
817
Damien Miller4f9f42a2003-05-10 19:28:02 +1000818static void *sshpam_ctxt, *sshpam_authok;
819extern KbdintDevice sshpam_device;
820
821int
822mm_answer_pam_init_ctx(int socket, Buffer *m)
823{
824
825 debug3("%s", __func__);
826 authctxt->user = buffer_get_string(m, NULL);
827 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
828 sshpam_authok = NULL;
829 buffer_clear(m);
830 if (sshpam_ctxt != NULL) {
831 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
832 buffer_put_int(m, 1);
833 } else {
834 buffer_put_int(m, 0);
835 }
836 mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m);
837 return (0);
838}
839
840int
841mm_answer_pam_query(int socket, Buffer *m)
842{
843 char *name, *info, **prompts;
844 u_int num, *echo_on;
845 int i, ret;
846
847 debug3("%s", __func__);
848 sshpam_authok = NULL;
849 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
850 if (ret == 0 && num == 0)
851 sshpam_authok = sshpam_ctxt;
852 if (num > 1 || name == NULL || info == NULL)
853 ret = -1;
854 buffer_clear(m);
855 buffer_put_int(m, ret);
856 buffer_put_cstring(m, name);
857 xfree(name);
858 buffer_put_cstring(m, info);
859 xfree(info);
860 buffer_put_int(m, num);
861 for (i = 0; i < num; ++i) {
862 buffer_put_cstring(m, prompts[i]);
863 xfree(prompts[i]);
864 buffer_put_int(m, echo_on[i]);
865 }
866 if (prompts != NULL)
867 xfree(prompts);
868 if (echo_on != NULL)
869 xfree(echo_on);
870 mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m);
871 return (0);
872}
873
874int
875mm_answer_pam_respond(int socket, Buffer *m)
876{
877 char **resp;
878 u_int num;
879 int i, ret;
880
881 debug3("%s", __func__);
882 sshpam_authok = NULL;
883 num = buffer_get_int(m);
884 if (num > 0) {
885 resp = xmalloc(num * sizeof(char *));
886 for (i = 0; i < num; ++i)
887 resp[i] = buffer_get_string(m, NULL);
888 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
889 for (i = 0; i < num; ++i)
890 xfree(resp[i]);
891 xfree(resp);
892 } else {
893 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
894 }
895 buffer_clear(m);
896 buffer_put_int(m, ret);
897 mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m);
898 auth_method = "keyboard-interactive/pam";
899 if (ret == 0)
900 sshpam_authok = sshpam_ctxt;
901 return (0);
902}
903
904int
905mm_answer_pam_free_ctx(int socket, Buffer *m)
906{
907
908 debug3("%s", __func__);
909 (sshpam_device.free_ctx)(sshpam_ctxt);
910 buffer_clear(m);
911 mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m);
912 return (sshpam_authok == sshpam_ctxt);
913}
Damien Miller79418552002-04-23 20:28:48 +1000914#endif
915
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000916static void
917mm_append_debug(Buffer *m)
918{
919 if (auth_debug_init && buffer_len(&auth_debug)) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000920 debug3("%s: Appending debug messages for child", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000921 buffer_append(m, buffer_ptr(&auth_debug),
922 buffer_len(&auth_debug));
923 buffer_clear(&auth_debug);
924 }
925}
926
927int
928mm_answer_keyallowed(int socket, Buffer *m)
929{
930 Key *key;
Damien Millera10f5612002-09-12 09:49:15 +1000931 char *cuser, *chost;
932 u_char *blob;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000933 u_int bloblen;
934 enum mm_keytype type = 0;
935 int allowed = 0;
936
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000937 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000938
939 type = buffer_get_int(m);
940 cuser = buffer_get_string(m, NULL);
941 chost = buffer_get_string(m, NULL);
942 blob = buffer_get_string(m, &bloblen);
943
944 key = key_from_blob(blob, bloblen);
945
946 if ((compat20 && type == MM_RSAHOSTKEY) ||
947 (!compat20 && type != MM_RSAHOSTKEY))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000948 fatal("%s: key type and protocol mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000949
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000950 debug3("%s: key_from_blob: %p", __func__, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000951
Damien Miller3e3b5142003-11-17 21:13:40 +1100952 if (key != NULL && authctxt->valid) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000953 switch(type) {
954 case MM_USERKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000955 allowed = options.pubkey_authentication &&
956 user_key_allowed(authctxt->pw, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000957 break;
958 case MM_HOSTKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000959 allowed = options.hostbased_authentication &&
960 hostbased_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000961 cuser, chost, key);
962 break;
963 case MM_RSAHOSTKEY:
964 key->type = KEY_RSA1; /* XXX */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000965 allowed = options.rhosts_rsa_authentication &&
966 auth_rhosts_rsa_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000967 cuser, chost, key);
968 break;
969 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000970 fatal("%s: unknown key type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000971 break;
972 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000973 }
Damien Miller00111382003-03-10 11:21:17 +1100974 if (key != NULL)
975 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000976
977 /* clear temporarily storage (used by verify) */
978 monitor_reset_key_state();
979
980 if (allowed) {
981 /* Save temporarily for comparison in verify */
982 key_blob = blob;
983 key_bloblen = bloblen;
984 key_blobtype = type;
985 hostbased_cuser = cuser;
986 hostbased_chost = chost;
987 }
988
989 debug3("%s: key %p is %s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000990 __func__, key, allowed ? "allowed" : "disallowed");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000991
992 buffer_clear(m);
993 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +1100994 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000995
996 mm_append_debug(m);
997
998 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
999
1000 if (type == MM_RSAHOSTKEY)
1001 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1002
1003 return (0);
1004}
1005
1006static int
1007monitor_valid_userblob(u_char *data, u_int datalen)
1008{
1009 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001010 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001011 u_int len;
1012 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001013
1014 buffer_init(&b);
1015 buffer_append(&b, data, datalen);
1016
1017 if (datafellows & SSH_OLD_SESSIONID) {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001018 p = buffer_ptr(&b);
1019 len = buffer_len(&b);
1020 if ((session_id2 == NULL) ||
1021 (len < session_id2_len) ||
1022 (memcmp(p, session_id2, session_id2_len) != 0))
1023 fail++;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001024 buffer_consume(&b, session_id2_len);
1025 } else {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001026 p = buffer_get_string(&b, &len);
1027 if ((session_id2 == NULL) ||
1028 (len != session_id2_len) ||
1029 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001030 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001031 xfree(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001032 }
1033 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1034 fail++;
1035 p = buffer_get_string(&b, NULL);
1036 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001037 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001038 authctxt->user, p);
1039 fail++;
1040 }
1041 xfree(p);
1042 buffer_skip_string(&b);
1043 if (datafellows & SSH_BUG_PKAUTH) {
1044 if (!buffer_get_char(&b))
1045 fail++;
1046 } else {
1047 p = buffer_get_string(&b, NULL);
1048 if (strcmp("publickey", p) != 0)
1049 fail++;
1050 xfree(p);
1051 if (!buffer_get_char(&b))
1052 fail++;
1053 buffer_skip_string(&b);
1054 }
1055 buffer_skip_string(&b);
1056 if (buffer_len(&b) != 0)
1057 fail++;
1058 buffer_free(&b);
1059 return (fail == 0);
1060}
1061
1062static int
Damien Millera10f5612002-09-12 09:49:15 +10001063monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1064 char *chost)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001065{
1066 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001067 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001068 u_int len;
1069 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001070
1071 buffer_init(&b);
1072 buffer_append(&b, data, datalen);
1073
Ben Lindstromf67e0772002-06-06 20:58:19 +00001074 p = buffer_get_string(&b, &len);
1075 if ((session_id2 == NULL) ||
1076 (len != session_id2_len) ||
1077 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001078 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001079 xfree(p);
1080
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001081 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1082 fail++;
1083 p = buffer_get_string(&b, NULL);
1084 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001085 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001086 authctxt->user, p);
1087 fail++;
1088 }
1089 xfree(p);
1090 buffer_skip_string(&b); /* service */
1091 p = buffer_get_string(&b, NULL);
1092 if (strcmp(p, "hostbased") != 0)
1093 fail++;
1094 xfree(p);
1095 buffer_skip_string(&b); /* pkalg */
1096 buffer_skip_string(&b); /* pkblob */
1097
1098 /* verify client host, strip trailing dot if necessary */
1099 p = buffer_get_string(&b, NULL);
1100 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1101 p[len - 1] = '\0';
1102 if (strcmp(p, chost) != 0)
1103 fail++;
1104 xfree(p);
1105
1106 /* verify client user */
1107 p = buffer_get_string(&b, NULL);
1108 if (strcmp(p, cuser) != 0)
1109 fail++;
1110 xfree(p);
1111
1112 if (buffer_len(&b) != 0)
1113 fail++;
1114 buffer_free(&b);
1115 return (fail == 0);
1116}
1117
1118int
1119mm_answer_keyverify(int socket, Buffer *m)
1120{
1121 Key *key;
1122 u_char *signature, *data, *blob;
1123 u_int signaturelen, datalen, bloblen;
1124 int verified = 0;
1125 int valid_data = 0;
1126
1127 blob = buffer_get_string(m, &bloblen);
1128 signature = buffer_get_string(m, &signaturelen);
1129 data = buffer_get_string(m, &datalen);
1130
1131 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
Ben Lindstromb57a4bf2002-03-27 18:00:59 +00001132 !monitor_allowed_key(blob, bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001133 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001134
1135 key = key_from_blob(blob, bloblen);
1136 if (key == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001137 fatal("%s: bad public key blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001138
1139 switch (key_blobtype) {
1140 case MM_USERKEY:
1141 valid_data = monitor_valid_userblob(data, datalen);
1142 break;
1143 case MM_HOSTKEY:
1144 valid_data = monitor_valid_hostbasedblob(data, datalen,
1145 hostbased_cuser, hostbased_chost);
1146 break;
1147 default:
1148 valid_data = 0;
1149 break;
1150 }
1151 if (!valid_data)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001152 fatal("%s: bad signature data blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001153
1154 verified = key_verify(key, signature, signaturelen, data, datalen);
1155 debug3("%s: key %p signature %s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001156 __func__, key, verified ? "verified" : "unverified");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001157
1158 key_free(key);
1159 xfree(blob);
1160 xfree(signature);
1161 xfree(data);
1162
Ben Lindstrome1c09122002-06-23 00:38:24 +00001163 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1164
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001165 monitor_reset_key_state();
1166
1167 buffer_clear(m);
1168 buffer_put_int(m, verified);
1169 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1170
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001171 return (verified);
1172}
1173
1174static void
1175mm_record_login(Session *s, struct passwd *pw)
1176{
1177 socklen_t fromlen;
1178 struct sockaddr_storage from;
1179
1180 /*
1181 * Get IP address of client. If the connection is not a socket, let
1182 * the address be 0.0.0.0.
1183 */
1184 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +10001185 fromlen = sizeof(from);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001186 if (packet_connection_is_on_socket()) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001187 if (getpeername(packet_get_connection_in(),
1188 (struct sockaddr *) & from, &fromlen) < 0) {
1189 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +10001190 cleanup_exit(255);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001191 }
1192 }
1193 /* Record that there was a login on that tty from the remote host. */
1194 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
Damien Miller3a961dc2003-06-03 10:25:48 +10001195 get_remote_name_or_ip(utmp_len, options.use_dns),
Damien Millerebc23062002-09-04 16:45:09 +10001196 (struct sockaddr *)&from, fromlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001197}
1198
1199static void
1200mm_session_close(Session *s)
1201{
Damien Miller04bd8b02003-05-25 14:38:33 +10001202 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001203 if (s->ttyfd != -1) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001204 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001205 session_pty_cleanup2(s);
1206 }
1207 s->used = 0;
1208}
1209
1210int
1211mm_answer_pty(int socket, Buffer *m)
1212{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001213 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001214 Session *s;
1215 int res, fd0;
1216
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001217 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001218
1219 buffer_clear(m);
1220 s = session_new();
1221 if (s == NULL)
1222 goto error;
1223 s->authctxt = authctxt;
1224 s->pw = authctxt->pw;
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001225 s->pid = pmonitor->m_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001226 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1227 if (res == 0)
1228 goto error;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001229 pty_setowner(authctxt->pw, s->tty);
1230
1231 buffer_put_int(m, 1);
1232 buffer_put_cstring(m, s->tty);
1233 mm_request_send(socket, MONITOR_ANS_PTY, m);
1234
1235 mm_send_fd(socket, s->ptyfd);
1236 mm_send_fd(socket, s->ttyfd);
1237
1238 /* We need to trick ttyslot */
1239 if (dup2(s->ttyfd, 0) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001240 fatal("%s: dup2", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001241
1242 mm_record_login(s, authctxt->pw);
1243
1244 /* Now we can close the file descriptor again */
1245 close(0);
1246
1247 /* make sure nothing uses fd 0 */
1248 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001249 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001250 if (fd0 != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001251 error("%s: fd0 %d != 0", __func__, fd0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001252
1253 /* slave is not needed */
1254 close(s->ttyfd);
1255 s->ttyfd = s->ptyfd;
1256 /* no need to dup() because nobody closes ptyfd */
1257 s->ptymaster = s->ptyfd;
1258
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001259 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001260
1261 return (0);
1262
1263 error:
1264 if (s != NULL)
1265 mm_session_close(s);
1266 buffer_put_int(m, 0);
1267 mm_request_send(socket, MONITOR_ANS_PTY, m);
1268 return (0);
1269}
1270
1271int
1272mm_answer_pty_cleanup(int socket, Buffer *m)
1273{
1274 Session *s;
1275 char *tty;
1276
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001277 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001278
1279 tty = buffer_get_string(m, NULL);
1280 if ((s = session_by_tty(tty)) != NULL)
1281 mm_session_close(s);
1282 buffer_clear(m);
1283 xfree(tty);
1284 return (0);
1285}
1286
1287int
1288mm_answer_sesskey(int socket, Buffer *m)
1289{
1290 BIGNUM *p;
1291 int rsafail;
1292
1293 /* Turn off permissions */
1294 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1295
1296 if ((p = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001297 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001298
1299 buffer_get_bignum2(m, p);
1300
1301 rsafail = ssh1_session_key(p);
1302
1303 buffer_clear(m);
1304 buffer_put_int(m, rsafail);
1305 buffer_put_bignum2(m, p);
1306
1307 BN_clear_free(p);
1308
1309 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1310
1311 /* Turn on permissions for sessid passing */
1312 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1313
1314 return (0);
1315}
1316
1317int
1318mm_answer_sessid(int socket, Buffer *m)
1319{
1320 int i;
1321
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001322 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001323
1324 if (buffer_len(m) != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001325 fatal("%s: bad ssh1 session id", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001326 for (i = 0; i < 16; i++)
1327 session_id[i] = buffer_get_char(m);
1328
1329 /* Turn on permissions for getpwnam */
1330 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1331
1332 return (0);
1333}
1334
1335int
1336mm_answer_rsa_keyallowed(int socket, Buffer *m)
1337{
1338 BIGNUM *client_n;
1339 Key *key = NULL;
1340 u_char *blob = NULL;
1341 u_int blen = 0;
1342 int allowed = 0;
1343
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001344 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001345
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001346 if (options.rsa_authentication && authctxt->valid) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001347 if ((client_n = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001348 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001349 buffer_get_bignum2(m, client_n);
1350 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1351 BN_clear_free(client_n);
1352 }
1353 buffer_clear(m);
1354 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001355 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001356
1357 /* clear temporarily storage (used by generate challenge) */
1358 monitor_reset_key_state();
1359
1360 if (allowed && key != NULL) {
1361 key->type = KEY_RSA; /* cheat for key_to_blob */
1362 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001363 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001364 buffer_put_string(m, blob, blen);
1365
1366 /* Save temporarily for comparison in verify */
1367 key_blob = blob;
1368 key_bloblen = blen;
1369 key_blobtype = MM_RSAUSERKEY;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001370 }
Damien Miller00111382003-03-10 11:21:17 +11001371 if (key != NULL)
1372 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001373
1374 mm_append_debug(m);
1375
1376 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1377
1378 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1379 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1380 return (0);
1381}
1382
1383int
1384mm_answer_rsa_challenge(int socket, Buffer *m)
1385{
1386 Key *key = NULL;
1387 u_char *blob;
1388 u_int blen;
1389
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001390 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001391
1392 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001393 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001394 blob = buffer_get_string(m, &blen);
1395 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001396 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001397 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001398 fatal("%s: key type mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001399 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001400 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001401
1402 if (ssh1_challenge)
1403 BN_clear_free(ssh1_challenge);
1404 ssh1_challenge = auth_rsa_generate_challenge(key);
1405
1406 buffer_clear(m);
1407 buffer_put_bignum2(m, ssh1_challenge);
1408
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001409 debug3("%s sending reply", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001410 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1411
1412 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
Damien Miller00111382003-03-10 11:21:17 +11001413
1414 xfree(blob);
1415 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001416 return (0);
1417}
1418
1419int
1420mm_answer_rsa_response(int socket, Buffer *m)
1421{
1422 Key *key = NULL;
1423 u_char *blob, *response;
1424 u_int blen, len;
1425 int success;
1426
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001427 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001428
1429 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001430 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001431 if (ssh1_challenge == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001432 fatal("%s: no ssh1_challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001433
1434 blob = buffer_get_string(m, &blen);
1435 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001436 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001437 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001438 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001439 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001440 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001441 response = buffer_get_string(m, &len);
1442 if (len != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001443 fatal("%s: received bad response to challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001444 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1445
Damien Miller00111382003-03-10 11:21:17 +11001446 xfree(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001447 key_free(key);
1448 xfree(response);
1449
1450 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1451
1452 /* reset state */
1453 BN_clear_free(ssh1_challenge);
1454 ssh1_challenge = NULL;
1455 monitor_reset_key_state();
1456
1457 buffer_clear(m);
1458 buffer_put_int(m, success);
1459 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1460
1461 return (success);
1462}
1463
1464int
1465mm_answer_term(int socket, Buffer *req)
1466{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001467 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001468 int res, status;
1469
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001470 debug3("%s: tearing down sessions", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001471
1472 /* The child is terminating */
1473 session_destroy_all(&mm_session_close);
1474
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001475 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
Ben Lindstrom47fd8112002-04-02 20:48:19 +00001476 if (errno != EINTR)
1477 exit(1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001478
1479 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1480
1481 /* Terminate process */
1482 exit (res);
1483}
1484
1485void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001486monitor_apply_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001487{
1488 if (compat20) {
1489 set_newkeys(MODE_IN);
1490 set_newkeys(MODE_OUT);
1491 } else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001492 packet_set_protocol_flags(child_state.ssh1protoflags);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001493 packet_set_encryption_key(child_state.ssh1key,
1494 child_state.ssh1keylen, child_state.ssh1cipher);
1495 xfree(child_state.ssh1key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001496 }
1497
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001498 /* for rc4 and other stateful ciphers */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001499 packet_set_keycontext(MODE_OUT, child_state.keyout);
1500 xfree(child_state.keyout);
1501 packet_set_keycontext(MODE_IN, child_state.keyin);
1502 xfree(child_state.keyin);
1503
1504 if (!compat20) {
1505 packet_set_iv(MODE_OUT, child_state.ivout);
1506 xfree(child_state.ivout);
1507 packet_set_iv(MODE_IN, child_state.ivin);
1508 xfree(child_state.ivin);
1509 }
1510
1511 memcpy(&incoming_stream, &child_state.incoming,
1512 sizeof(incoming_stream));
1513 memcpy(&outgoing_stream, &child_state.outgoing,
1514 sizeof(outgoing_stream));
1515
1516 /* Update with new address */
Damien Miller2d6b8332002-06-21 15:59:49 +10001517 if (options.compression)
1518 mm_init_compression(pmonitor->m_zlib);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001519
1520 /* Network I/O buffers */
1521 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1522 buffer_clear(&input);
1523 buffer_append(&input, child_state.input, child_state.ilen);
1524 memset(child_state.input, 0, child_state.ilen);
1525 xfree(child_state.input);
1526
1527 buffer_clear(&output);
1528 buffer_append(&output, child_state.output, child_state.olen);
1529 memset(child_state.output, 0, child_state.olen);
1530 xfree(child_state.output);
1531}
1532
1533static Kex *
1534mm_get_kex(Buffer *m)
1535{
1536 Kex *kex;
1537 void *blob;
1538 u_int bloblen;
1539
1540 kex = xmalloc(sizeof(*kex));
1541 memset(kex, 0, sizeof(*kex));
1542 kex->session_id = buffer_get_string(m, &kex->session_id_len);
Ben Lindstromf67e0772002-06-06 20:58:19 +00001543 if ((session_id2 == NULL) ||
1544 (kex->session_id_len != session_id2_len) ||
1545 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1546 fatal("mm_get_get: internal error: bad session id");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001547 kex->we_need = buffer_get_int(m);
Damien Millerb062c292003-03-24 09:12:09 +11001548 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1549 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001550 kex->server = 1;
1551 kex->hostkey_type = buffer_get_int(m);
1552 kex->kex_type = buffer_get_int(m);
1553 blob = buffer_get_string(m, &bloblen);
1554 buffer_init(&kex->my);
1555 buffer_append(&kex->my, blob, bloblen);
1556 xfree(blob);
1557 blob = buffer_get_string(m, &bloblen);
1558 buffer_init(&kex->peer);
1559 buffer_append(&kex->peer, blob, bloblen);
1560 xfree(blob);
1561 kex->done = 1;
1562 kex->flags = buffer_get_int(m);
1563 kex->client_version_string = buffer_get_string(m, NULL);
1564 kex->server_version_string = buffer_get_string(m, NULL);
1565 kex->load_host_key=&get_hostkey_by_type;
1566 kex->host_key_index=&get_hostkey_index;
1567
1568 return (kex);
1569}
1570
1571/* This function requries careful sanity checking */
1572
1573void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001574mm_get_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001575{
1576 Buffer m;
1577 u_char *blob, *p;
1578 u_int bloblen, plen;
Damien Millera5539d22003-04-09 20:50:06 +10001579 u_int32_t seqnr, packets;
1580 u_int64_t blocks;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001581
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001582 debug3("%s: Waiting for new keys", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001583
1584 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001585 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001586 if (!compat20) {
1587 child_state.ssh1protoflags = buffer_get_int(&m);
1588 child_state.ssh1cipher = buffer_get_int(&m);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001589 child_state.ssh1key = buffer_get_string(&m,
1590 &child_state.ssh1keylen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001591 child_state.ivout = buffer_get_string(&m,
1592 &child_state.ivoutlen);
1593 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1594 goto skip;
1595 } else {
1596 /* Get the Kex for rekeying */
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001597 *pmonitor->m_pkex = mm_get_kex(&m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001598 }
1599
1600 blob = buffer_get_string(&m, &bloblen);
1601 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1602 xfree(blob);
1603
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001604 debug3("%s: Waiting for second key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001605 blob = buffer_get_string(&m, &bloblen);
1606 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1607 xfree(blob);
1608
1609 /* Now get sequence numbers for the packets */
Damien Millera5539d22003-04-09 20:50:06 +10001610 seqnr = buffer_get_int(&m);
1611 blocks = buffer_get_int64(&m);
1612 packets = buffer_get_int(&m);
1613 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1614 seqnr = buffer_get_int(&m);
1615 blocks = buffer_get_int64(&m);
1616 packets = buffer_get_int(&m);
1617 packet_set_state(MODE_IN, seqnr, blocks, packets);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001618
1619 skip:
1620 /* Get the key context */
1621 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1622 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1623
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001624 debug3("%s: Getting compression state", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001625 /* Get compression state */
1626 p = buffer_get_string(&m, &plen);
1627 if (plen != sizeof(child_state.outgoing))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001628 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001629 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1630 xfree(p);
1631
1632 p = buffer_get_string(&m, &plen);
1633 if (plen != sizeof(child_state.incoming))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001634 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001635 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1636 xfree(p);
1637
1638 /* Network I/O buffers */
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001639 debug3("%s: Getting Network I/O buffers", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001640 child_state.input = buffer_get_string(&m, &child_state.ilen);
1641 child_state.output = buffer_get_string(&m, &child_state.olen);
1642
1643 buffer_free(&m);
1644}
1645
1646
1647/* Allocation functions for zlib */
1648void *
1649mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1650{
Ben Lindstrom41ee2b02002-11-09 15:47:47 +00001651 size_t len = (size_t) size * ncount;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001652 void *address;
1653
Ben Lindstrom0a4f7542002-08-20 18:36:25 +00001654 if (len == 0 || ncount > SIZE_T_MAX / size)
Damien Miller530a7542002-06-26 23:27:11 +10001655 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1656
1657 address = mm_malloc(mm, len);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001658
1659 return (address);
1660}
1661
1662void
1663mm_zfree(struct mm_master *mm, void *address)
1664{
1665 mm_free(mm, address);
1666}
1667
1668void
1669mm_init_compression(struct mm_master *mm)
1670{
1671 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1672 outgoing_stream.zfree = (free_func)mm_zfree;
1673 outgoing_stream.opaque = mm;
1674
1675 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1676 incoming_stream.zfree = (free_func)mm_zfree;
1677 incoming_stream.opaque = mm;
1678}
1679
1680/* XXX */
1681
1682#define FD_CLOSEONEXEC(x) do { \
1683 if (fcntl(x, F_SETFD, 1) == -1) \
1684 fatal("fcntl(%d, F_SETFD)", x); \
1685} while (0)
1686
1687static void
1688monitor_socketpair(int *pair)
1689{
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001690#ifdef HAVE_SOCKETPAIR
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001691 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001692 fatal("%s: socketpair", __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001693#else
1694 fatal("%s: UsePrivilegeSeparation=yes not supported",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001695 __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001696#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001697 FD_CLOSEONEXEC(pair[0]);
1698 FD_CLOSEONEXEC(pair[1]);
1699}
1700
1701#define MM_MEMSIZE 65536
1702
1703struct monitor *
1704monitor_init(void)
1705{
1706 struct monitor *mon;
1707 int pair[2];
1708
1709 mon = xmalloc(sizeof(*mon));
1710
Darren Tuckera8be9e22004-02-06 16:40:27 +11001711 mon->m_pid = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001712 monitor_socketpair(pair);
1713
1714 mon->m_recvfd = pair[0];
1715 mon->m_sendfd = pair[1];
1716
1717 /* Used to share zlib space across processes */
Damien Miller2d6b8332002-06-21 15:59:49 +10001718 if (options.compression) {
1719 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1720 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001721
Damien Miller2d6b8332002-06-21 15:59:49 +10001722 /* Compression needs to share state across borders */
1723 mm_init_compression(mon->m_zlib);
1724 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001725
1726 return mon;
1727}
1728
1729void
1730monitor_reinit(struct monitor *mon)
1731{
1732 int pair[2];
1733
1734 monitor_socketpair(pair);
1735
1736 mon->m_recvfd = pair[0];
1737 mon->m_sendfd = pair[1];
1738}
Darren Tucker0efd1552003-08-26 11:49:55 +10001739
1740#ifdef GSSAPI
1741int
1742mm_answer_gss_setup_ctx(int socket, Buffer *m)
1743{
1744 gss_OID_desc oid;
1745 OM_uint32 major;
1746 u_int len;
1747
1748 oid.elements = buffer_get_string(m, &len);
1749 oid.length = len;
1750
1751 major = ssh_gssapi_server_ctx(&gsscontext, &oid);
1752
1753 xfree(oid.elements);
1754
1755 buffer_clear(m);
1756 buffer_put_int(m, major);
1757
1758 mm_request_send(socket,MONITOR_ANS_GSSSETUP, m);
1759
1760 /* Now we have a context, enable the step */
1761 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1762
1763 return (0);
1764}
1765
1766int
1767mm_answer_gss_accept_ctx(int socket, Buffer *m)
1768{
1769 gss_buffer_desc in;
1770 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1771 OM_uint32 major,minor;
1772 OM_uint32 flags = 0; /* GSI needs this */
Darren Tucker600ad8d2003-08-26 12:10:48 +10001773 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001774
Darren Tucker600ad8d2003-08-26 12:10:48 +10001775 in.value = buffer_get_string(m, &len);
1776 in.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001777 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1778 xfree(in.value);
1779
1780 buffer_clear(m);
1781 buffer_put_int(m, major);
1782 buffer_put_string(m, out.value, out.length);
1783 buffer_put_int(m, flags);
1784 mm_request_send(socket, MONITOR_ANS_GSSSTEP, m);
1785
1786 gss_release_buffer(&minor, &out);
1787
Darren Tucker0efd1552003-08-26 11:49:55 +10001788 if (major==GSS_S_COMPLETE) {
1789 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1790 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller0425d402003-11-17 22:18:21 +11001791 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
Darren Tucker0efd1552003-08-26 11:49:55 +10001792 }
1793 return (0);
1794}
1795
1796int
Damien Miller0425d402003-11-17 22:18:21 +11001797mm_answer_gss_checkmic(int socket, Buffer *m)
1798{
1799 gss_buffer_desc gssbuf, mic;
1800 OM_uint32 ret;
1801 u_int len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001802
Damien Miller0425d402003-11-17 22:18:21 +11001803 gssbuf.value = buffer_get_string(m, &len);
1804 gssbuf.length = len;
1805 mic.value = buffer_get_string(m, &len);
1806 mic.length = len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001807
Damien Miller0425d402003-11-17 22:18:21 +11001808 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +11001809
Damien Miller0425d402003-11-17 22:18:21 +11001810 xfree(gssbuf.value);
1811 xfree(mic.value);
Damien Miller787b2ec2003-11-21 23:56:47 +11001812
Damien Miller0425d402003-11-17 22:18:21 +11001813 buffer_clear(m);
1814 buffer_put_int(m, ret);
Damien Miller787b2ec2003-11-21 23:56:47 +11001815
Damien Miller0425d402003-11-17 22:18:21 +11001816 mm_request_send(socket, MONITOR_ANS_GSSCHECKMIC, m);
Damien Miller787b2ec2003-11-21 23:56:47 +11001817
Damien Miller0425d402003-11-17 22:18:21 +11001818 if (!GSS_ERROR(ret))
1819 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller787b2ec2003-11-21 23:56:47 +11001820
Damien Miller0425d402003-11-17 22:18:21 +11001821 return (0);
1822}
1823
1824int
Darren Tucker0efd1552003-08-26 11:49:55 +10001825mm_answer_gss_userok(int socket, Buffer *m)
1826{
1827 int authenticated;
1828
1829 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1830
1831 buffer_clear(m);
1832 buffer_put_int(m, authenticated);
1833
1834 debug3("%s: sending result %d", __func__, authenticated);
1835 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
1836
Damien Miller0425d402003-11-17 22:18:21 +11001837 auth_method="gssapi-with-mic";
Darren Tucker0efd1552003-08-26 11:49:55 +10001838
1839 /* Monitor loop will terminate if authenticated */
1840 return (authenticated);
1841}
1842#endif /* GSSAPI */