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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 Tucker47eede72005-03-14 23:08:12 +110028RCSID("$OpenBSD: monitor.c,v 1.63 2005/03/10 22:01:05 deraadt 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"
Ben Lindstrom036768e2004-04-08 16:12:30 +000040#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
41#undef TARGET_OS_MAC
Ben Lindstrom1b9f2a62004-04-08 05:11:03 +000042#include "zlib.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000043#define TARGET_OS_MAC 1
44#else
45#include "zlib.h"
46#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000047#include "packet.h"
48#include "auth-options.h"
49#include "sshpty.h"
50#include "channels.h"
51#include "session.h"
52#include "sshlogin.h"
53#include "canohost.h"
54#include "log.h"
55#include "servconf.h"
56#include "monitor.h"
57#include "monitor_mm.h"
58#include "monitor_wrap.h"
59#include "monitor_fdpass.h"
60#include "xmalloc.h"
61#include "misc.h"
62#include "buffer.h"
63#include "bufaux.h"
64#include "compat.h"
65#include "ssh2.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000066
Darren Tucker0efd1552003-08-26 11:49:55 +100067#ifdef GSSAPI
68#include "ssh-gss.h"
69static Gssctxt *gsscontext = NULL;
70#endif
71
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000072/* Imports */
73extern ServerOptions options;
74extern u_int utmp_len;
75extern Newkeys *current_keys[];
76extern z_stream incoming_stream;
77extern z_stream outgoing_stream;
78extern u_char session_id[];
79extern Buffer input, output;
80extern Buffer auth_debug;
81extern int auth_debug_init;
Darren Tucker09991742004-07-17 17:05:14 +100082extern Buffer loginmsg;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000083
84/* State exported from the child */
85
86struct {
87 z_stream incoming;
88 z_stream outgoing;
89 u_char *keyin;
90 u_int keyinlen;
91 u_char *keyout;
92 u_int keyoutlen;
93 u_char *ivin;
94 u_int ivinlen;
95 u_char *ivout;
96 u_int ivoutlen;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +000097 u_char *ssh1key;
98 u_int ssh1keylen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000099 int ssh1cipher;
100 int ssh1protoflags;
101 u_char *input;
102 u_int ilen;
103 u_char *output;
104 u_int olen;
105} child_state;
106
Damien Miller469954d2003-06-18 20:25:33 +1000107/* Functions on the monitor that answer unprivileged requests */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000108
109int mm_answer_moduli(int, Buffer *);
110int mm_answer_sign(int, Buffer *);
111int mm_answer_pwnamallow(int, Buffer *);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000112int mm_answer_auth2_read_banner(int, Buffer *);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000113int mm_answer_authserv(int, Buffer *);
114int mm_answer_authpassword(int, Buffer *);
115int mm_answer_bsdauthquery(int, Buffer *);
116int mm_answer_bsdauthrespond(int, Buffer *);
117int mm_answer_skeyquery(int, Buffer *);
118int mm_answer_skeyrespond(int, Buffer *);
119int mm_answer_keyallowed(int, Buffer *);
120int mm_answer_keyverify(int, Buffer *);
121int mm_answer_pty(int, Buffer *);
122int mm_answer_pty_cleanup(int, Buffer *);
123int mm_answer_term(int, Buffer *);
124int mm_answer_rsa_keyallowed(int, Buffer *);
125int mm_answer_rsa_challenge(int, Buffer *);
126int mm_answer_rsa_response(int, Buffer *);
127int mm_answer_sesskey(int, Buffer *);
128int mm_answer_sessid(int, Buffer *);
129
Damien Miller79418552002-04-23 20:28:48 +1000130#ifdef USE_PAM
131int mm_answer_pam_start(int, Buffer *);
Damien Miller1f499fd2003-08-25 13:08:49 +1000132int mm_answer_pam_account(int, Buffer *);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000133int mm_answer_pam_init_ctx(int, Buffer *);
134int mm_answer_pam_query(int, Buffer *);
135int mm_answer_pam_respond(int, Buffer *);
136int mm_answer_pam_free_ctx(int, Buffer *);
Damien Miller79418552002-04-23 20:28:48 +1000137#endif
138
Darren Tucker0efd1552003-08-26 11:49:55 +1000139#ifdef GSSAPI
140int mm_answer_gss_setup_ctx(int, Buffer *);
141int mm_answer_gss_accept_ctx(int, Buffer *);
142int mm_answer_gss_userok(int, Buffer *);
Damien Miller0425d402003-11-17 22:18:21 +1100143int mm_answer_gss_checkmic(int, Buffer *);
Darren Tucker0efd1552003-08-26 11:49:55 +1000144#endif
Damien Miller25162f22002-09-12 09:47:29 +1000145
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100146#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100147int mm_answer_audit_event(int, Buffer *);
148int mm_answer_audit_command(int, Buffer *);
149#endif
150
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000151static Authctxt *authctxt;
152static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
153
154/* local state for key verify */
155static u_char *key_blob = NULL;
156static u_int key_bloblen = 0;
157static int key_blobtype = MM_NOKEY;
Damien Millera10f5612002-09-12 09:49:15 +1000158static char *hostbased_cuser = NULL;
159static char *hostbased_chost = NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000160static char *auth_method = "unknown";
Darren Tucker502d3842003-06-28 12:38:01 +1000161static u_int session_id2_len = 0;
Ben Lindstromf67e0772002-06-06 20:58:19 +0000162static u_char *session_id2 = NULL;
Damien Millerbe64d432003-05-14 19:31:12 +1000163static pid_t monitor_child_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000164
165struct mon_table {
166 enum monitor_reqtype type;
167 int flags;
168 int (*f)(int, Buffer *);
169};
170
171#define MON_ISAUTH 0x0004 /* Required for Authentication */
172#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
173#define MON_ONCE 0x0010 /* Disable after calling */
174
175#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
176
177#define MON_PERMIT 0x1000 /* Request is permitted */
178
179struct mon_table mon_dispatch_proto20[] = {
180 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
181 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
182 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
183 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
Damien Miller5ad9fd92002-05-13 11:07:41 +1000184 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000185 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller79418552002-04-23 20:28:48 +1000186#ifdef USE_PAM
187 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000188 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000189 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
190 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
191 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
192 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Kevin Stevesbd1901b2002-04-01 18:04:35 +0000193#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100194#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100195 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100196#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000197#ifdef BSD_AUTH
198 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
199 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
200#endif
201#ifdef SKEY
202 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
203 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
204#endif
205 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
206 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
Darren Tucker0efd1552003-08-26 11:49:55 +1000207#ifdef GSSAPI
208 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
209 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
210 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
Damien Miller0425d402003-11-17 22:18:21 +1100211 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
Darren Tucker0efd1552003-08-26 11:49:55 +1000212#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000213 {0, 0, NULL}
214};
215
216struct mon_table mon_dispatch_postauth20[] = {
217 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
218 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
219 {MONITOR_REQ_PTY, 0, mm_answer_pty},
220 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
221 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100222#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100223 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
224 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
225#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000226 {0, 0, NULL}
227};
228
229struct mon_table mon_dispatch_proto15[] = {
230 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
231 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
232 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
233 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
234 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
235 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
236 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
237 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
238#ifdef BSD_AUTH
239 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
240 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
241#endif
242#ifdef SKEY
243 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
244 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
245#endif
Damien Millera33501b2002-05-08 12:24:42 +1000246#ifdef USE_PAM
247 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000248 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000249 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
250 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
251 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
252 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Damien Millera33501b2002-05-08 12:24:42 +1000253#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100254#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100255 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100256#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000257 {0, 0, NULL}
258};
259
260struct mon_table mon_dispatch_postauth15[] = {
261 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
262 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
263 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100264#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100265 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker3745e2b2005-03-06 22:31:35 +1100266 {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100267#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000268 {0, 0, NULL}
269};
270
271struct mon_table *mon_dispatch;
272
273/* Specifies if a certain message is allowed at the moment */
274
275static void
276monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
277{
278 while (ent->f != NULL) {
279 if (ent->type == type) {
280 ent->flags &= ~MON_PERMIT;
281 ent->flags |= permit ? MON_PERMIT : 0;
282 return;
283 }
284 ent++;
285 }
286}
287
288static void
289monitor_permit_authentications(int permit)
290{
291 struct mon_table *ent = mon_dispatch;
292
293 while (ent->f != NULL) {
294 if (ent->flags & MON_AUTH) {
295 ent->flags &= ~MON_PERMIT;
296 ent->flags |= permit ? MON_PERMIT : 0;
297 }
298 ent++;
299 }
300}
301
Darren Tucker3e33cec2003-10-02 16:12:36 +1000302void
303monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000304{
305 struct mon_table *ent;
306 int authenticated = 0;
307
308 debug3("preauth child monitor started");
309
Darren Tucker3e33cec2003-10-02 16:12:36 +1000310 authctxt = _authctxt;
311 memset(authctxt, 0, sizeof(*authctxt));
312
Darren Tuckerde0de392005-03-31 23:52:04 +1000313 authctxt->loginmsg = &loginmsg;
314
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000315 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);
321 } else {
322 mon_dispatch = mon_dispatch_proto15;
323
324 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
325 }
326
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000327 /* The first few requests do not require asynchronous access */
328 while (!authenticated) {
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000329 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000330 if (authenticated) {
331 if (!(ent->flags & MON_AUTHDECIDE))
332 fatal("%s: unexpected authentication from %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000333 __func__, ent->type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000334 if (authctxt->pw->pw_uid == 0 &&
335 !auth_root_allowed(auth_method))
336 authenticated = 0;
Damien Miller1f499fd2003-08-25 13:08:49 +1000337#ifdef USE_PAM
338 /* PAM needs to perform account checks after auth */
Damien Miller6aef38f2003-11-18 10:45:20 +1100339 if (options.use_pam && authenticated) {
Damien Miller1f499fd2003-08-25 13:08:49 +1000340 Buffer m;
341
342 buffer_init(&m);
Damien Millera8e06ce2003-11-21 23:48:55 +1100343 mm_request_receive_expect(pmonitor->m_sendfd,
Damien Miller1f499fd2003-08-25 13:08:49 +1000344 MONITOR_REQ_PAM_ACCOUNT, &m);
345 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
346 buffer_free(&m);
347 }
348#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000349 }
350
351 if (ent->flags & MON_AUTHDECIDE) {
352 auth_log(authctxt, authenticated, auth_method,
353 compat20 ? " ssh2" : "");
354 if (!authenticated)
355 authctxt->failures++;
356 }
357 }
358
359 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000360 fatal("%s: authenticated invalid user", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000361
362 debug("%s: %s has been authenticated by privileged process",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000363 __func__, authctxt->user);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000364
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000365 mm_get_keystate(pmonitor);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000366}
367
Damien Millerbe64d432003-05-14 19:31:12 +1000368static void
369monitor_set_child_handler(pid_t pid)
370{
371 monitor_child_pid = pid;
372}
373
374static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000375monitor_child_handler(int sig)
Damien Millerbe64d432003-05-14 19:31:12 +1000376{
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000377 kill(monitor_child_pid, sig);
Damien Millerbe64d432003-05-14 19:31:12 +1000378}
379
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000380void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000381monitor_child_postauth(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000382{
Damien Millerbe64d432003-05-14 19:31:12 +1000383 monitor_set_child_handler(pmonitor->m_pid);
384 signal(SIGHUP, &monitor_child_handler);
385 signal(SIGTERM, &monitor_child_handler);
386
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000387 if (compat20) {
388 mon_dispatch = mon_dispatch_postauth20;
389
390 /* Permit requests for moduli and signatures */
391 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
392 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
393 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000394 } else {
395 mon_dispatch = mon_dispatch_postauth15;
396 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
397 }
398 if (!no_pty_flag) {
399 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
400 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
401 }
402
403 for (;;)
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000404 monitor_read(pmonitor, mon_dispatch, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000405}
406
407void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000408monitor_sync(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000409{
Damien Miller2d6b8332002-06-21 15:59:49 +1000410 if (options.compression) {
411 /* The member allocation is not visible, so sync it */
412 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
413 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000414}
415
416int
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000417monitor_read(struct monitor *pmonitor, struct mon_table *ent,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000418 struct mon_table **pent)
419{
420 Buffer m;
421 int ret;
422 u_char type;
423
424 buffer_init(&m);
425
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000426 mm_request_receive(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000427 type = buffer_get_char(&m);
428
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000429 debug3("%s: checking request %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000430
431 while (ent->f != NULL) {
432 if (ent->type == type)
433 break;
434 ent++;
435 }
436
437 if (ent->f != NULL) {
438 if (!(ent->flags & MON_PERMIT))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000439 fatal("%s: unpermitted request %d", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000440 type);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000441 ret = (*ent->f)(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000442 buffer_free(&m);
443
444 /* The child may use this request only once, disable it */
445 if (ent->flags & MON_ONCE) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000446 debug2("%s: %d used once, disabling now", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000447 type);
448 ent->flags &= ~MON_PERMIT;
449 }
450
451 if (pent != NULL)
452 *pent = ent;
453
454 return ret;
455 }
456
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000457 fatal("%s: unsupported request: %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000458
459 /* NOTREACHED */
460 return (-1);
461}
462
463/* allowed key state */
464static int
465monitor_allowed_key(u_char *blob, u_int bloblen)
466{
467 /* make sure key is allowed */
468 if (key_blob == NULL || key_bloblen != bloblen ||
469 memcmp(key_blob, blob, key_bloblen))
470 return (0);
471 return (1);
472}
473
474static void
475monitor_reset_key_state(void)
476{
477 /* reset state */
478 if (key_blob != NULL)
479 xfree(key_blob);
480 if (hostbased_cuser != NULL)
481 xfree(hostbased_cuser);
482 if (hostbased_chost != NULL)
483 xfree(hostbased_chost);
484 key_blob = NULL;
485 key_bloblen = 0;
486 key_blobtype = MM_NOKEY;
487 hostbased_cuser = NULL;
488 hostbased_chost = NULL;
489}
490
491int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000492mm_answer_moduli(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000493{
494 DH *dh;
495 int min, want, max;
496
497 min = buffer_get_int(m);
498 want = buffer_get_int(m);
499 max = buffer_get_int(m);
500
501 debug3("%s: got parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000502 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000503 /* We need to check here, too, in case the child got corrupted */
504 if (max < min || want < min || max < want)
505 fatal("%s: bad parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000506 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000507
508 buffer_clear(m);
509
510 dh = choose_dh(min, want, max);
511 if (dh == NULL) {
512 buffer_put_char(m, 0);
513 return (0);
514 } else {
515 /* Send first bignum */
516 buffer_put_char(m, 1);
517 buffer_put_bignum2(m, dh->p);
518 buffer_put_bignum2(m, dh->g);
519
520 DH_free(dh);
521 }
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000522 mm_request_send(sock, MONITOR_ANS_MODULI, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000523 return (0);
524}
525
526int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000527mm_answer_sign(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000528{
529 Key *key;
530 u_char *p;
531 u_char *signature;
532 u_int siglen, datlen;
533 int keyid;
534
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000535 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000536
537 keyid = buffer_get_int(m);
538 p = buffer_get_string(m, &datlen);
539
540 if (datlen != 20)
Ben Lindstromd5502182002-06-27 00:12:57 +0000541 fatal("%s: data length incorrect: %u", __func__, datlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000542
Ben Lindstromf67e0772002-06-06 20:58:19 +0000543 /* save session id, it will be passed on the first call */
544 if (session_id2_len == 0) {
545 session_id2_len = datlen;
546 session_id2 = xmalloc(session_id2_len);
547 memcpy(session_id2, p, session_id2_len);
548 }
549
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000550 if ((key = get_hostkey_by_index(keyid)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000551 fatal("%s: no hostkey from index %d", __func__, keyid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000552 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000553 fatal("%s: key_sign failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000554
Ben Lindstromd5502182002-06-27 00:12:57 +0000555 debug3("%s: signature %p(%u)", __func__, signature, siglen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000556
557 buffer_clear(m);
558 buffer_put_string(m, signature, siglen);
559
560 xfree(p);
561 xfree(signature);
562
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000563 mm_request_send(sock, MONITOR_ANS_SIGN, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000564
565 /* Turn on permissions for getpwnam */
566 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
567
568 return (0);
569}
570
571/* Retrieves the password entry and also checks if the user is permitted */
572
573int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000574mm_answer_pwnamallow(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000575{
Darren Tuckerb09b6772004-06-22 15:06:46 +1000576 char *username;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000577 struct passwd *pwent;
578 int allowed = 0;
579
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000580 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000581
582 if (authctxt->attempt++ != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000583 fatal("%s: multiple attempts for getpwnam", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000584
Darren Tuckerb09b6772004-06-22 15:06:46 +1000585 username = buffer_get_string(m, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000586
Darren Tuckerb09b6772004-06-22 15:06:46 +1000587 pwent = getpwnamallow(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000588
Darren Tuckerb09b6772004-06-22 15:06:46 +1000589 authctxt->user = xstrdup(username);
590 setproctitle("%s [priv]", pwent ? username : "unknown");
591 xfree(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000592
593 buffer_clear(m);
594
595 if (pwent == NULL) {
596 buffer_put_char(m, 0);
Damien Millerf96d1832003-11-18 22:01:48 +1100597 authctxt->pw = fakepw();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000598 goto out;
599 }
600
601 allowed = 1;
602 authctxt->pw = pwent;
603 authctxt->valid = 1;
604
605 buffer_put_char(m, 1);
606 buffer_put_string(m, pwent, sizeof(struct passwd));
607 buffer_put_cstring(m, pwent->pw_name);
608 buffer_put_cstring(m, "*");
609 buffer_put_cstring(m, pwent->pw_gecos);
Kevin Steves7e147602002-03-22 18:07:17 +0000610#ifdef HAVE_PW_CLASS_IN_PASSWD
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000611 buffer_put_cstring(m, pwent->pw_class);
Kevin Steves7e147602002-03-22 18:07:17 +0000612#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000613 buffer_put_cstring(m, pwent->pw_dir);
614 buffer_put_cstring(m, pwent->pw_shell);
615
616 out:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000617 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000618 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000619
620 /* For SSHv1 allow authentication now */
621 if (!compat20)
622 monitor_permit_authentications(1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000623 else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000624 /* Allow service/style information on the auth context */
625 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000626 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
627 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000628
Damien Millera33501b2002-05-08 12:24:42 +1000629#ifdef USE_PAM
Damien Miller4e448a32003-05-14 15:11:48 +1000630 if (options.use_pam)
631 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
Damien Millera33501b2002-05-08 12:24:42 +1000632#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100633#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100634 monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1);
Darren Tucker269a1ea2005-02-03 00:20:53 +1100635#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000636
637 return (0);
638}
639
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000640int mm_answer_auth2_read_banner(int sock, Buffer *m)
Damien Miller5ad9fd92002-05-13 11:07:41 +1000641{
642 char *banner;
643
644 buffer_clear(m);
645 banner = auth2_read_banner();
646 buffer_put_cstring(m, banner != NULL ? banner : "");
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000647 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000648
649 if (banner != NULL)
Ben Lindstromeec16fc2002-07-04 00:06:15 +0000650 xfree(banner);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000651
652 return (0);
653}
654
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000655int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000656mm_answer_authserv(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000657{
658 monitor_permit_authentications(1);
659
660 authctxt->service = buffer_get_string(m, NULL);
661 authctxt->style = buffer_get_string(m, NULL);
662 debug3("%s: service=%s, style=%s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000663 __func__, authctxt->service, authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000664
665 if (strlen(authctxt->style) == 0) {
666 xfree(authctxt->style);
667 authctxt->style = NULL;
668 }
669
670 return (0);
671}
672
673int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000674mm_answer_authpassword(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000675{
676 static int call_count;
677 char *passwd;
Ben Lindstrom7cea16b2002-07-23 21:13:40 +0000678 int authenticated;
679 u_int plen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000680
681 passwd = buffer_get_string(m, &plen);
682 /* Only authenticate if the context is valid */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000683 authenticated = options.password_authentication &&
Damien Miller856f0be2003-09-03 07:32:45 +1000684 auth_password(authctxt, passwd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000685 memset(passwd, 0, strlen(passwd));
686 xfree(passwd);
687
688 buffer_clear(m);
689 buffer_put_int(m, authenticated);
690
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000691 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000692 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000693
694 call_count++;
695 if (plen == 0 && call_count == 1)
696 auth_method = "none";
697 else
698 auth_method = "password";
699
700 /* Causes monitor loop to terminate if authenticated */
701 return (authenticated);
702}
703
704#ifdef BSD_AUTH
705int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000706mm_answer_bsdauthquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000707{
708 char *name, *infotxt;
709 u_int numprompts;
710 u_int *echo_on;
711 char **prompts;
Damien Millerb7df3af2003-02-24 11:55:46 +1100712 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000713
Damien Millerb7df3af2003-02-24 11:55:46 +1100714 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
715 &prompts, &echo_on) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000716
717 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100718 buffer_put_int(m, success);
719 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000720 buffer_put_cstring(m, prompts[0]);
721
Damien Millerb7df3af2003-02-24 11:55:46 +1100722 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000723 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000724
Damien Millerb7df3af2003-02-24 11:55:46 +1100725 if (success) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000726 xfree(name);
727 xfree(infotxt);
728 xfree(prompts);
729 xfree(echo_on);
730 }
731
732 return (0);
733}
734
735int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000736mm_answer_bsdauthrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000737{
738 char *response;
739 int authok;
740
741 if (authctxt->as == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000742 fatal("%s: no bsd auth session", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000743
744 response = buffer_get_string(m, NULL);
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000745 authok = options.challenge_response_authentication &&
746 auth_userresponse(authctxt->as, response, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000747 authctxt->as = NULL;
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000748 debug3("%s: <%s> = <%d>", __func__, response, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000749 xfree(response);
750
751 buffer_clear(m);
752 buffer_put_int(m, authok);
753
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000754 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000755 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000756
757 auth_method = "bsdauth";
758
759 return (authok != 0);
760}
761#endif
762
763#ifdef SKEY
764int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000765mm_answer_skeyquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000766{
767 struct skey skey;
768 char challenge[1024];
Damien Millerb7df3af2003-02-24 11:55:46 +1100769 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000770
Darren Tucker06a8cfe2004-04-14 17:24:30 +1000771 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
772 sizeof(challenge)) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000773
774 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100775 buffer_put_int(m, success);
776 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000777 buffer_put_cstring(m, challenge);
778
Damien Millerb7df3af2003-02-24 11:55:46 +1100779 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000780 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000781
782 return (0);
783}
784
785int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000786mm_answer_skeyrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000787{
788 char *response;
789 int authok;
790
791 response = buffer_get_string(m, NULL);
792
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000793 authok = (options.challenge_response_authentication &&
794 authctxt->valid &&
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000795 skey_haskey(authctxt->pw->pw_name) == 0 &&
796 skey_passcheck(authctxt->pw->pw_name, response) != -1);
797
798 xfree(response);
799
800 buffer_clear(m);
801 buffer_put_int(m, authok);
802
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000803 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000804 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000805
806 auth_method = "skey";
807
808 return (authok != 0);
809}
810#endif
811
Damien Miller79418552002-04-23 20:28:48 +1000812#ifdef USE_PAM
813int
Darren Tucker7eda5922004-06-22 13:22:50 +1000814mm_answer_pam_start(int sock, Buffer *m)
Damien Miller79418552002-04-23 20:28:48 +1000815{
Damien Miller4e448a32003-05-14 15:11:48 +1000816 if (!options.use_pam)
817 fatal("UsePAM not set, but ended up in %s anyway", __func__);
818
Darren Tuckerdbf7a742004-03-08 23:04:06 +1100819 start_pam(authctxt);
Damien Miller79418552002-04-23 20:28:48 +1000820
Damien Miller1f499fd2003-08-25 13:08:49 +1000821 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
822
Damien Miller79418552002-04-23 20:28:48 +1000823 return (0);
824}
Damien Miller4f9f42a2003-05-10 19:28:02 +1000825
Damien Miller1f499fd2003-08-25 13:08:49 +1000826int
Darren Tucker7eda5922004-06-22 13:22:50 +1000827mm_answer_pam_account(int sock, Buffer *m)
Damien Miller1f499fd2003-08-25 13:08:49 +1000828{
829 u_int ret;
Damien Miller787b2ec2003-11-21 23:56:47 +1100830
Damien Miller1f499fd2003-08-25 13:08:49 +1000831 if (!options.use_pam)
832 fatal("UsePAM not set, but ended up in %s anyway", __func__);
833
834 ret = do_pam_account();
835
836 buffer_put_int(m, ret);
Darren Tucker77fc29e2004-09-11 23:07:03 +1000837 buffer_append(&loginmsg, "\0", 1);
838 buffer_put_cstring(m, buffer_ptr(&loginmsg));
839 buffer_clear(&loginmsg);
Damien Miller1f499fd2003-08-25 13:08:49 +1000840
Darren Tucker7eda5922004-06-22 13:22:50 +1000841 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
Damien Miller1f499fd2003-08-25 13:08:49 +1000842
843 return (ret);
844}
845
Damien Miller4f9f42a2003-05-10 19:28:02 +1000846static void *sshpam_ctxt, *sshpam_authok;
847extern KbdintDevice sshpam_device;
848
849int
Darren Tucker7eda5922004-06-22 13:22:50 +1000850mm_answer_pam_init_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000851{
852
853 debug3("%s", __func__);
854 authctxt->user = buffer_get_string(m, NULL);
855 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
856 sshpam_authok = NULL;
857 buffer_clear(m);
858 if (sshpam_ctxt != NULL) {
859 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
860 buffer_put_int(m, 1);
861 } else {
862 buffer_put_int(m, 0);
863 }
Darren Tucker7eda5922004-06-22 13:22:50 +1000864 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000865 return (0);
866}
867
868int
Darren Tucker7eda5922004-06-22 13:22:50 +1000869mm_answer_pam_query(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000870{
871 char *name, *info, **prompts;
872 u_int num, *echo_on;
873 int i, ret;
874
875 debug3("%s", __func__);
876 sshpam_authok = NULL;
877 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
878 if (ret == 0 && num == 0)
879 sshpam_authok = sshpam_ctxt;
880 if (num > 1 || name == NULL || info == NULL)
881 ret = -1;
882 buffer_clear(m);
883 buffer_put_int(m, ret);
884 buffer_put_cstring(m, name);
885 xfree(name);
886 buffer_put_cstring(m, info);
887 xfree(info);
888 buffer_put_int(m, num);
889 for (i = 0; i < num; ++i) {
890 buffer_put_cstring(m, prompts[i]);
891 xfree(prompts[i]);
892 buffer_put_int(m, echo_on[i]);
893 }
894 if (prompts != NULL)
895 xfree(prompts);
896 if (echo_on != NULL)
897 xfree(echo_on);
Darren Tucker7eda5922004-06-22 13:22:50 +1000898 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000899 return (0);
900}
901
902int
Darren Tucker7eda5922004-06-22 13:22:50 +1000903mm_answer_pam_respond(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000904{
905 char **resp;
906 u_int num;
907 int i, ret;
908
909 debug3("%s", __func__);
910 sshpam_authok = NULL;
911 num = buffer_get_int(m);
912 if (num > 0) {
913 resp = xmalloc(num * sizeof(char *));
914 for (i = 0; i < num; ++i)
915 resp[i] = buffer_get_string(m, NULL);
916 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
917 for (i = 0; i < num; ++i)
918 xfree(resp[i]);
919 xfree(resp);
920 } else {
921 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
922 }
923 buffer_clear(m);
924 buffer_put_int(m, ret);
Darren Tucker7eda5922004-06-22 13:22:50 +1000925 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000926 auth_method = "keyboard-interactive/pam";
927 if (ret == 0)
928 sshpam_authok = sshpam_ctxt;
929 return (0);
930}
931
932int
Darren Tucker7eda5922004-06-22 13:22:50 +1000933mm_answer_pam_free_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000934{
935
936 debug3("%s", __func__);
937 (sshpam_device.free_ctx)(sshpam_ctxt);
938 buffer_clear(m);
Darren Tucker7eda5922004-06-22 13:22:50 +1000939 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000940 return (sshpam_authok == sshpam_ctxt);
941}
Damien Miller79418552002-04-23 20:28:48 +1000942#endif
943
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000944static void
945mm_append_debug(Buffer *m)
946{
947 if (auth_debug_init && buffer_len(&auth_debug)) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000948 debug3("%s: Appending debug messages for child", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000949 buffer_append(m, buffer_ptr(&auth_debug),
950 buffer_len(&auth_debug));
951 buffer_clear(&auth_debug);
952 }
953}
954
955int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000956mm_answer_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000957{
958 Key *key;
Damien Millera10f5612002-09-12 09:49:15 +1000959 char *cuser, *chost;
960 u_char *blob;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000961 u_int bloblen;
962 enum mm_keytype type = 0;
963 int allowed = 0;
964
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000965 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000966
967 type = buffer_get_int(m);
968 cuser = buffer_get_string(m, NULL);
969 chost = buffer_get_string(m, NULL);
970 blob = buffer_get_string(m, &bloblen);
971
972 key = key_from_blob(blob, bloblen);
973
974 if ((compat20 && type == MM_RSAHOSTKEY) ||
975 (!compat20 && type != MM_RSAHOSTKEY))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000976 fatal("%s: key type and protocol mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000977
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000978 debug3("%s: key_from_blob: %p", __func__, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000979
Damien Miller3e3b5142003-11-17 21:13:40 +1100980 if (key != NULL && authctxt->valid) {
Darren Tucker47eede72005-03-14 23:08:12 +1100981 switch (type) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000982 case MM_USERKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000983 allowed = options.pubkey_authentication &&
984 user_key_allowed(authctxt->pw, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000985 break;
986 case MM_HOSTKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000987 allowed = options.hostbased_authentication &&
988 hostbased_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000989 cuser, chost, key);
990 break;
991 case MM_RSAHOSTKEY:
992 key->type = KEY_RSA1; /* XXX */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000993 allowed = options.rhosts_rsa_authentication &&
994 auth_rhosts_rsa_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000995 cuser, chost, key);
996 break;
997 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000998 fatal("%s: unknown key type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000999 break;
1000 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001001 }
Damien Miller00111382003-03-10 11:21:17 +11001002 if (key != NULL)
1003 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001004
1005 /* clear temporarily storage (used by verify) */
1006 monitor_reset_key_state();
1007
1008 if (allowed) {
1009 /* Save temporarily for comparison in verify */
1010 key_blob = blob;
1011 key_bloblen = bloblen;
1012 key_blobtype = type;
1013 hostbased_cuser = cuser;
1014 hostbased_chost = chost;
1015 }
1016
1017 debug3("%s: key %p is %s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001018 __func__, key, allowed ? "allowed" : "disallowed");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001019
1020 buffer_clear(m);
1021 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001022 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001023
1024 mm_append_debug(m);
1025
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001026 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001027
1028 if (type == MM_RSAHOSTKEY)
1029 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1030
1031 return (0);
1032}
1033
1034static int
1035monitor_valid_userblob(u_char *data, u_int datalen)
1036{
1037 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001038 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001039 u_int len;
1040 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001041
1042 buffer_init(&b);
1043 buffer_append(&b, data, datalen);
1044
1045 if (datafellows & SSH_OLD_SESSIONID) {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001046 p = buffer_ptr(&b);
1047 len = buffer_len(&b);
1048 if ((session_id2 == NULL) ||
1049 (len < session_id2_len) ||
1050 (memcmp(p, session_id2, session_id2_len) != 0))
1051 fail++;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001052 buffer_consume(&b, session_id2_len);
1053 } else {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001054 p = buffer_get_string(&b, &len);
1055 if ((session_id2 == NULL) ||
1056 (len != session_id2_len) ||
1057 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001058 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001059 xfree(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001060 }
1061 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1062 fail++;
1063 p = buffer_get_string(&b, NULL);
1064 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001065 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001066 authctxt->user, p);
1067 fail++;
1068 }
1069 xfree(p);
1070 buffer_skip_string(&b);
1071 if (datafellows & SSH_BUG_PKAUTH) {
1072 if (!buffer_get_char(&b))
1073 fail++;
1074 } else {
1075 p = buffer_get_string(&b, NULL);
1076 if (strcmp("publickey", p) != 0)
1077 fail++;
1078 xfree(p);
1079 if (!buffer_get_char(&b))
1080 fail++;
1081 buffer_skip_string(&b);
1082 }
1083 buffer_skip_string(&b);
1084 if (buffer_len(&b) != 0)
1085 fail++;
1086 buffer_free(&b);
1087 return (fail == 0);
1088}
1089
1090static int
Damien Millera10f5612002-09-12 09:49:15 +10001091monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1092 char *chost)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001093{
1094 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001095 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001096 u_int len;
1097 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001098
1099 buffer_init(&b);
1100 buffer_append(&b, data, datalen);
1101
Ben Lindstromf67e0772002-06-06 20:58:19 +00001102 p = buffer_get_string(&b, &len);
1103 if ((session_id2 == NULL) ||
1104 (len != session_id2_len) ||
1105 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001106 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001107 xfree(p);
1108
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001109 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1110 fail++;
1111 p = buffer_get_string(&b, NULL);
1112 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001113 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001114 authctxt->user, p);
1115 fail++;
1116 }
1117 xfree(p);
1118 buffer_skip_string(&b); /* service */
1119 p = buffer_get_string(&b, NULL);
1120 if (strcmp(p, "hostbased") != 0)
1121 fail++;
1122 xfree(p);
1123 buffer_skip_string(&b); /* pkalg */
1124 buffer_skip_string(&b); /* pkblob */
1125
1126 /* verify client host, strip trailing dot if necessary */
1127 p = buffer_get_string(&b, NULL);
1128 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1129 p[len - 1] = '\0';
1130 if (strcmp(p, chost) != 0)
1131 fail++;
1132 xfree(p);
1133
1134 /* verify client user */
1135 p = buffer_get_string(&b, NULL);
1136 if (strcmp(p, cuser) != 0)
1137 fail++;
1138 xfree(p);
1139
1140 if (buffer_len(&b) != 0)
1141 fail++;
1142 buffer_free(&b);
1143 return (fail == 0);
1144}
1145
1146int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001147mm_answer_keyverify(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001148{
1149 Key *key;
1150 u_char *signature, *data, *blob;
1151 u_int signaturelen, datalen, bloblen;
1152 int verified = 0;
1153 int valid_data = 0;
1154
1155 blob = buffer_get_string(m, &bloblen);
1156 signature = buffer_get_string(m, &signaturelen);
1157 data = buffer_get_string(m, &datalen);
1158
1159 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
Ben Lindstromb57a4bf2002-03-27 18:00:59 +00001160 !monitor_allowed_key(blob, bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001161 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001162
1163 key = key_from_blob(blob, bloblen);
1164 if (key == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001165 fatal("%s: bad public key blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001166
1167 switch (key_blobtype) {
1168 case MM_USERKEY:
1169 valid_data = monitor_valid_userblob(data, datalen);
1170 break;
1171 case MM_HOSTKEY:
1172 valid_data = monitor_valid_hostbasedblob(data, datalen,
1173 hostbased_cuser, hostbased_chost);
1174 break;
1175 default:
1176 valid_data = 0;
1177 break;
1178 }
1179 if (!valid_data)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001180 fatal("%s: bad signature data blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001181
1182 verified = key_verify(key, signature, signaturelen, data, datalen);
1183 debug3("%s: key %p signature %s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001184 __func__, key, verified ? "verified" : "unverified");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001185
1186 key_free(key);
1187 xfree(blob);
1188 xfree(signature);
1189 xfree(data);
1190
Ben Lindstrome1c09122002-06-23 00:38:24 +00001191 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1192
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001193 monitor_reset_key_state();
1194
1195 buffer_clear(m);
1196 buffer_put_int(m, verified);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001197 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001198
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001199 return (verified);
1200}
1201
1202static void
1203mm_record_login(Session *s, struct passwd *pw)
1204{
1205 socklen_t fromlen;
1206 struct sockaddr_storage from;
1207
1208 /*
1209 * Get IP address of client. If the connection is not a socket, let
1210 * the address be 0.0.0.0.
1211 */
1212 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +10001213 fromlen = sizeof(from);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001214 if (packet_connection_is_on_socket()) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001215 if (getpeername(packet_get_connection_in(),
1216 (struct sockaddr *) & from, &fromlen) < 0) {
1217 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +10001218 cleanup_exit(255);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001219 }
1220 }
1221 /* Record that there was a login on that tty from the remote host. */
1222 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
Damien Miller3a961dc2003-06-03 10:25:48 +10001223 get_remote_name_or_ip(utmp_len, options.use_dns),
Damien Millerebc23062002-09-04 16:45:09 +10001224 (struct sockaddr *)&from, fromlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001225}
1226
1227static void
1228mm_session_close(Session *s)
1229{
Damien Miller04bd8b02003-05-25 14:38:33 +10001230 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001231 if (s->ttyfd != -1) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001232 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001233 session_pty_cleanup2(s);
1234 }
1235 s->used = 0;
1236}
1237
1238int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001239mm_answer_pty(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001240{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001241 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001242 Session *s;
1243 int res, fd0;
1244
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001245 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001246
1247 buffer_clear(m);
1248 s = session_new();
1249 if (s == NULL)
1250 goto error;
1251 s->authctxt = authctxt;
1252 s->pw = authctxt->pw;
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001253 s->pid = pmonitor->m_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001254 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1255 if (res == 0)
1256 goto error;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001257 pty_setowner(authctxt->pw, s->tty);
1258
1259 buffer_put_int(m, 1);
1260 buffer_put_cstring(m, s->tty);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001261
1262 /* We need to trick ttyslot */
1263 if (dup2(s->ttyfd, 0) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001264 fatal("%s: dup2", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001265
1266 mm_record_login(s, authctxt->pw);
1267
1268 /* Now we can close the file descriptor again */
1269 close(0);
1270
Darren Tucker09991742004-07-17 17:05:14 +10001271 /* send messages generated by record_login */
1272 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1273 buffer_clear(&loginmsg);
1274
1275 mm_request_send(sock, MONITOR_ANS_PTY, m);
1276
1277 mm_send_fd(sock, s->ptyfd);
1278 mm_send_fd(sock, s->ttyfd);
1279
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001280 /* make sure nothing uses fd 0 */
1281 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001282 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001283 if (fd0 != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001284 error("%s: fd0 %d != 0", __func__, fd0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001285
1286 /* slave is not needed */
1287 close(s->ttyfd);
1288 s->ttyfd = s->ptyfd;
1289 /* no need to dup() because nobody closes ptyfd */
1290 s->ptymaster = s->ptyfd;
1291
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001292 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001293
1294 return (0);
1295
1296 error:
1297 if (s != NULL)
1298 mm_session_close(s);
1299 buffer_put_int(m, 0);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001300 mm_request_send(sock, MONITOR_ANS_PTY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001301 return (0);
1302}
1303
1304int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001305mm_answer_pty_cleanup(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001306{
1307 Session *s;
1308 char *tty;
1309
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001310 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001311
1312 tty = buffer_get_string(m, NULL);
1313 if ((s = session_by_tty(tty)) != NULL)
1314 mm_session_close(s);
1315 buffer_clear(m);
1316 xfree(tty);
1317 return (0);
1318}
1319
1320int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001321mm_answer_sesskey(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001322{
1323 BIGNUM *p;
1324 int rsafail;
1325
1326 /* Turn off permissions */
Darren Tucker5b530262005-02-09 09:52:17 +11001327 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001328
1329 if ((p = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001330 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001331
1332 buffer_get_bignum2(m, p);
1333
1334 rsafail = ssh1_session_key(p);
1335
1336 buffer_clear(m);
1337 buffer_put_int(m, rsafail);
1338 buffer_put_bignum2(m, p);
1339
1340 BN_clear_free(p);
1341
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001342 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001343
1344 /* Turn on permissions for sessid passing */
1345 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1346
1347 return (0);
1348}
1349
1350int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001351mm_answer_sessid(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001352{
1353 int i;
1354
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001355 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001356
1357 if (buffer_len(m) != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001358 fatal("%s: bad ssh1 session id", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001359 for (i = 0; i < 16; i++)
1360 session_id[i] = buffer_get_char(m);
1361
1362 /* Turn on permissions for getpwnam */
1363 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1364
1365 return (0);
1366}
1367
1368int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001369mm_answer_rsa_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001370{
1371 BIGNUM *client_n;
1372 Key *key = NULL;
1373 u_char *blob = NULL;
1374 u_int blen = 0;
1375 int allowed = 0;
1376
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001377 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001378
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001379 if (options.rsa_authentication && authctxt->valid) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001380 if ((client_n = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001381 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001382 buffer_get_bignum2(m, client_n);
1383 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1384 BN_clear_free(client_n);
1385 }
1386 buffer_clear(m);
1387 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001388 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001389
1390 /* clear temporarily storage (used by generate challenge) */
1391 monitor_reset_key_state();
1392
1393 if (allowed && key != NULL) {
1394 key->type = KEY_RSA; /* cheat for key_to_blob */
1395 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001396 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001397 buffer_put_string(m, blob, blen);
1398
1399 /* Save temporarily for comparison in verify */
1400 key_blob = blob;
1401 key_bloblen = blen;
1402 key_blobtype = MM_RSAUSERKEY;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001403 }
Damien Miller00111382003-03-10 11:21:17 +11001404 if (key != NULL)
1405 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001406
1407 mm_append_debug(m);
1408
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001409 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001410
1411 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1412 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1413 return (0);
1414}
1415
1416int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001417mm_answer_rsa_challenge(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001418{
1419 Key *key = NULL;
1420 u_char *blob;
1421 u_int blen;
1422
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001423 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001424
1425 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001426 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001427 blob = buffer_get_string(m, &blen);
1428 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001429 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001430 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001431 fatal("%s: key type mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001432 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001433 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001434
1435 if (ssh1_challenge)
1436 BN_clear_free(ssh1_challenge);
1437 ssh1_challenge = auth_rsa_generate_challenge(key);
1438
1439 buffer_clear(m);
1440 buffer_put_bignum2(m, ssh1_challenge);
1441
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001442 debug3("%s sending reply", __func__);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001443 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001444
1445 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
Damien Miller00111382003-03-10 11:21:17 +11001446
1447 xfree(blob);
1448 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001449 return (0);
1450}
1451
1452int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001453mm_answer_rsa_response(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001454{
1455 Key *key = NULL;
1456 u_char *blob, *response;
1457 u_int blen, len;
1458 int success;
1459
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001460 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001461
1462 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001463 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001464 if (ssh1_challenge == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001465 fatal("%s: no ssh1_challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001466
1467 blob = buffer_get_string(m, &blen);
1468 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001469 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001470 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001471 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001472 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001473 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001474 response = buffer_get_string(m, &len);
1475 if (len != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001476 fatal("%s: received bad response to challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001477 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1478
Damien Miller00111382003-03-10 11:21:17 +11001479 xfree(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001480 key_free(key);
1481 xfree(response);
1482
1483 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1484
1485 /* reset state */
1486 BN_clear_free(ssh1_challenge);
1487 ssh1_challenge = NULL;
1488 monitor_reset_key_state();
1489
1490 buffer_clear(m);
1491 buffer_put_int(m, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001492 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001493
1494 return (success);
1495}
1496
1497int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001498mm_answer_term(int sock, Buffer *req)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001499{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001500 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001501 int res, status;
1502
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001503 debug3("%s: tearing down sessions", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001504
1505 /* The child is terminating */
1506 session_destroy_all(&mm_session_close);
1507
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001508 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
Ben Lindstrom47fd8112002-04-02 20:48:19 +00001509 if (errno != EINTR)
1510 exit(1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001511
1512 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1513
1514 /* Terminate process */
Darren Tucker1f8311c2004-05-13 16:39:33 +10001515 exit(res);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001516}
1517
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001518#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +11001519/* Report that an audit event occurred */
1520int
1521mm_answer_audit_event(int socket, Buffer *m)
1522{
1523 ssh_audit_event_t event;
1524
1525 debug3("%s entering", __func__);
1526
1527 event = buffer_get_int(m);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001528 switch(event) {
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001529 case SSH_AUTH_FAIL_PUBKEY:
1530 case SSH_AUTH_FAIL_HOSTBASED:
1531 case SSH_AUTH_FAIL_GSSAPI:
1532 case SSH_LOGIN_EXCEED_MAXTRIES:
1533 case SSH_LOGIN_ROOT_DENIED:
1534 case SSH_CONNECTION_CLOSE:
1535 case SSH_INVALID_USER:
Darren Tucker269a1ea2005-02-03 00:20:53 +11001536 audit_event(event);
1537 break;
1538 default:
1539 fatal("Audit event type %d not permitted", event);
1540 }
1541
1542 return (0);
1543}
1544
1545int
1546mm_answer_audit_command(int socket, Buffer *m)
1547{
1548 u_int len;
1549 char *cmd;
1550
1551 debug3("%s entering", __func__);
1552 cmd = buffer_get_string(m, &len);
1553 /* sanity check command, if so how? */
1554 audit_run_command(cmd);
1555 xfree(cmd);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001556 return (0);
1557}
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001558#endif /* SSH_AUDIT_EVENTS */
Darren Tucker269a1ea2005-02-03 00:20:53 +11001559
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001560void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001561monitor_apply_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001562{
1563 if (compat20) {
1564 set_newkeys(MODE_IN);
1565 set_newkeys(MODE_OUT);
1566 } else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001567 packet_set_protocol_flags(child_state.ssh1protoflags);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001568 packet_set_encryption_key(child_state.ssh1key,
1569 child_state.ssh1keylen, child_state.ssh1cipher);
1570 xfree(child_state.ssh1key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001571 }
1572
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001573 /* for rc4 and other stateful ciphers */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001574 packet_set_keycontext(MODE_OUT, child_state.keyout);
1575 xfree(child_state.keyout);
1576 packet_set_keycontext(MODE_IN, child_state.keyin);
1577 xfree(child_state.keyin);
1578
1579 if (!compat20) {
1580 packet_set_iv(MODE_OUT, child_state.ivout);
1581 xfree(child_state.ivout);
1582 packet_set_iv(MODE_IN, child_state.ivin);
1583 xfree(child_state.ivin);
1584 }
1585
1586 memcpy(&incoming_stream, &child_state.incoming,
1587 sizeof(incoming_stream));
1588 memcpy(&outgoing_stream, &child_state.outgoing,
1589 sizeof(outgoing_stream));
1590
1591 /* Update with new address */
Damien Miller2d6b8332002-06-21 15:59:49 +10001592 if (options.compression)
1593 mm_init_compression(pmonitor->m_zlib);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001594
1595 /* Network I/O buffers */
1596 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1597 buffer_clear(&input);
1598 buffer_append(&input, child_state.input, child_state.ilen);
1599 memset(child_state.input, 0, child_state.ilen);
1600 xfree(child_state.input);
1601
1602 buffer_clear(&output);
1603 buffer_append(&output, child_state.output, child_state.olen);
1604 memset(child_state.output, 0, child_state.olen);
1605 xfree(child_state.output);
1606}
1607
1608static Kex *
1609mm_get_kex(Buffer *m)
1610{
1611 Kex *kex;
1612 void *blob;
1613 u_int bloblen;
1614
1615 kex = xmalloc(sizeof(*kex));
1616 memset(kex, 0, sizeof(*kex));
1617 kex->session_id = buffer_get_string(m, &kex->session_id_len);
Ben Lindstromf67e0772002-06-06 20:58:19 +00001618 if ((session_id2 == NULL) ||
1619 (kex->session_id_len != session_id2_len) ||
1620 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1621 fatal("mm_get_get: internal error: bad session id");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001622 kex->we_need = buffer_get_int(m);
Damien Millerb062c292003-03-24 09:12:09 +11001623 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
Damien Millerf675fc42004-06-15 10:30:09 +10001624 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
Damien Millerb062c292003-03-24 09:12:09 +11001625 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001626 kex->server = 1;
1627 kex->hostkey_type = buffer_get_int(m);
1628 kex->kex_type = buffer_get_int(m);
1629 blob = buffer_get_string(m, &bloblen);
1630 buffer_init(&kex->my);
1631 buffer_append(&kex->my, blob, bloblen);
1632 xfree(blob);
1633 blob = buffer_get_string(m, &bloblen);
1634 buffer_init(&kex->peer);
1635 buffer_append(&kex->peer, blob, bloblen);
1636 xfree(blob);
1637 kex->done = 1;
1638 kex->flags = buffer_get_int(m);
1639 kex->client_version_string = buffer_get_string(m, NULL);
1640 kex->server_version_string = buffer_get_string(m, NULL);
1641 kex->load_host_key=&get_hostkey_by_type;
1642 kex->host_key_index=&get_hostkey_index;
1643
1644 return (kex);
1645}
1646
1647/* This function requries careful sanity checking */
1648
1649void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001650mm_get_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001651{
1652 Buffer m;
1653 u_char *blob, *p;
1654 u_int bloblen, plen;
Damien Millera5539d22003-04-09 20:50:06 +10001655 u_int32_t seqnr, packets;
1656 u_int64_t blocks;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001657
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001658 debug3("%s: Waiting for new keys", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001659
1660 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001661 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001662 if (!compat20) {
1663 child_state.ssh1protoflags = buffer_get_int(&m);
1664 child_state.ssh1cipher = buffer_get_int(&m);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001665 child_state.ssh1key = buffer_get_string(&m,
1666 &child_state.ssh1keylen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001667 child_state.ivout = buffer_get_string(&m,
1668 &child_state.ivoutlen);
1669 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1670 goto skip;
1671 } else {
1672 /* Get the Kex for rekeying */
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001673 *pmonitor->m_pkex = mm_get_kex(&m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001674 }
1675
1676 blob = buffer_get_string(&m, &bloblen);
1677 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1678 xfree(blob);
1679
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001680 debug3("%s: Waiting for second key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001681 blob = buffer_get_string(&m, &bloblen);
1682 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1683 xfree(blob);
1684
1685 /* Now get sequence numbers for the packets */
Damien Millera5539d22003-04-09 20:50:06 +10001686 seqnr = buffer_get_int(&m);
1687 blocks = buffer_get_int64(&m);
1688 packets = buffer_get_int(&m);
1689 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1690 seqnr = buffer_get_int(&m);
1691 blocks = buffer_get_int64(&m);
1692 packets = buffer_get_int(&m);
1693 packet_set_state(MODE_IN, seqnr, blocks, packets);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001694
1695 skip:
1696 /* Get the key context */
1697 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1698 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1699
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001700 debug3("%s: Getting compression state", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001701 /* Get compression state */
1702 p = buffer_get_string(&m, &plen);
1703 if (plen != sizeof(child_state.outgoing))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001704 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001705 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1706 xfree(p);
1707
1708 p = buffer_get_string(&m, &plen);
1709 if (plen != sizeof(child_state.incoming))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001710 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001711 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1712 xfree(p);
1713
1714 /* Network I/O buffers */
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001715 debug3("%s: Getting Network I/O buffers", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001716 child_state.input = buffer_get_string(&m, &child_state.ilen);
1717 child_state.output = buffer_get_string(&m, &child_state.olen);
1718
1719 buffer_free(&m);
1720}
1721
1722
1723/* Allocation functions for zlib */
1724void *
1725mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1726{
Ben Lindstrom41ee2b02002-11-09 15:47:47 +00001727 size_t len = (size_t) size * ncount;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001728 void *address;
1729
Ben Lindstrom0a4f7542002-08-20 18:36:25 +00001730 if (len == 0 || ncount > SIZE_T_MAX / size)
Damien Miller530a7542002-06-26 23:27:11 +10001731 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1732
1733 address = mm_malloc(mm, len);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001734
1735 return (address);
1736}
1737
1738void
1739mm_zfree(struct mm_master *mm, void *address)
1740{
1741 mm_free(mm, address);
1742}
1743
1744void
1745mm_init_compression(struct mm_master *mm)
1746{
1747 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1748 outgoing_stream.zfree = (free_func)mm_zfree;
1749 outgoing_stream.opaque = mm;
1750
1751 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1752 incoming_stream.zfree = (free_func)mm_zfree;
1753 incoming_stream.opaque = mm;
1754}
1755
1756/* XXX */
1757
1758#define FD_CLOSEONEXEC(x) do { \
1759 if (fcntl(x, F_SETFD, 1) == -1) \
1760 fatal("fcntl(%d, F_SETFD)", x); \
1761} while (0)
1762
1763static void
1764monitor_socketpair(int *pair)
1765{
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001766#ifdef HAVE_SOCKETPAIR
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001767 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001768 fatal("%s: socketpair", __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001769#else
1770 fatal("%s: UsePrivilegeSeparation=yes not supported",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001771 __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001772#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001773 FD_CLOSEONEXEC(pair[0]);
1774 FD_CLOSEONEXEC(pair[1]);
1775}
1776
1777#define MM_MEMSIZE 65536
1778
1779struct monitor *
1780monitor_init(void)
1781{
1782 struct monitor *mon;
1783 int pair[2];
1784
1785 mon = xmalloc(sizeof(*mon));
1786
Darren Tuckera8be9e22004-02-06 16:40:27 +11001787 mon->m_pid = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001788 monitor_socketpair(pair);
1789
1790 mon->m_recvfd = pair[0];
1791 mon->m_sendfd = pair[1];
1792
1793 /* Used to share zlib space across processes */
Damien Miller2d6b8332002-06-21 15:59:49 +10001794 if (options.compression) {
1795 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1796 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001797
Damien Miller2d6b8332002-06-21 15:59:49 +10001798 /* Compression needs to share state across borders */
1799 mm_init_compression(mon->m_zlib);
1800 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001801
1802 return mon;
1803}
1804
1805void
1806monitor_reinit(struct monitor *mon)
1807{
1808 int pair[2];
1809
1810 monitor_socketpair(pair);
1811
1812 mon->m_recvfd = pair[0];
1813 mon->m_sendfd = pair[1];
1814}
Darren Tucker0efd1552003-08-26 11:49:55 +10001815
1816#ifdef GSSAPI
1817int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001818mm_answer_gss_setup_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001819{
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001820 gss_OID_desc goid;
Darren Tucker0efd1552003-08-26 11:49:55 +10001821 OM_uint32 major;
1822 u_int len;
1823
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001824 goid.elements = buffer_get_string(m, &len);
1825 goid.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001826
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001827 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
Darren Tucker0efd1552003-08-26 11:49:55 +10001828
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001829 xfree(goid.elements);
Darren Tucker0efd1552003-08-26 11:49:55 +10001830
1831 buffer_clear(m);
1832 buffer_put_int(m, major);
1833
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001834 mm_request_send(sock,MONITOR_ANS_GSSSETUP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001835
1836 /* Now we have a context, enable the step */
1837 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1838
1839 return (0);
1840}
1841
1842int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001843mm_answer_gss_accept_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001844{
1845 gss_buffer_desc in;
1846 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1847 OM_uint32 major,minor;
1848 OM_uint32 flags = 0; /* GSI needs this */
Darren Tucker600ad8d2003-08-26 12:10:48 +10001849 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001850
Darren Tucker600ad8d2003-08-26 12:10:48 +10001851 in.value = buffer_get_string(m, &len);
1852 in.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001853 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1854 xfree(in.value);
1855
1856 buffer_clear(m);
1857 buffer_put_int(m, major);
1858 buffer_put_string(m, out.value, out.length);
1859 buffer_put_int(m, flags);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001860 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001861
1862 gss_release_buffer(&minor, &out);
1863
Darren Tucker0efd1552003-08-26 11:49:55 +10001864 if (major==GSS_S_COMPLETE) {
1865 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1866 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller0425d402003-11-17 22:18:21 +11001867 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
Darren Tucker0efd1552003-08-26 11:49:55 +10001868 }
1869 return (0);
1870}
1871
1872int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001873mm_answer_gss_checkmic(int sock, Buffer *m)
Damien Miller0425d402003-11-17 22:18:21 +11001874{
1875 gss_buffer_desc gssbuf, mic;
1876 OM_uint32 ret;
1877 u_int len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001878
Damien Miller0425d402003-11-17 22:18:21 +11001879 gssbuf.value = buffer_get_string(m, &len);
1880 gssbuf.length = len;
1881 mic.value = buffer_get_string(m, &len);
1882 mic.length = len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001883
Damien Miller0425d402003-11-17 22:18:21 +11001884 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +11001885
Damien Miller0425d402003-11-17 22:18:21 +11001886 xfree(gssbuf.value);
1887 xfree(mic.value);
Damien Miller787b2ec2003-11-21 23:56:47 +11001888
Damien Miller0425d402003-11-17 22:18:21 +11001889 buffer_clear(m);
1890 buffer_put_int(m, ret);
Damien Miller787b2ec2003-11-21 23:56:47 +11001891
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001892 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
Damien Miller787b2ec2003-11-21 23:56:47 +11001893
Damien Miller0425d402003-11-17 22:18:21 +11001894 if (!GSS_ERROR(ret))
1895 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller787b2ec2003-11-21 23:56:47 +11001896
Damien Miller0425d402003-11-17 22:18:21 +11001897 return (0);
1898}
1899
1900int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001901mm_answer_gss_userok(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001902{
1903 int authenticated;
1904
1905 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1906
1907 buffer_clear(m);
1908 buffer_put_int(m, authenticated);
1909
1910 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001911 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001912
Damien Miller0425d402003-11-17 22:18:21 +11001913 auth_method="gssapi-with-mic";
Darren Tucker0efd1552003-08-26 11:49:55 +10001914
1915 /* Monitor loop will terminate if authenticated */
1916 return (authenticated);
1917}
1918#endif /* GSSAPI */