blob: d672aeb725375ec4ab5ed60dbd23c51ef5dd6444 [file] [log] [blame]
Damien Miller57c30112006-03-26 14:24:48 +11001/* $OpenBSD: monitor.c,v 1.76 2006/03/25 13:17:02 djm Exp $ */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002/*
3 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4 * Copyright 2002 Markus Friedl <markus@openbsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "includes.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110029
30#include <sys/types.h>
31#include <sys/wait.h>
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000032
Damien Miller6645e7a2006-03-15 14:42:54 +110033#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110034#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110035#endif
Damien Miller6ff3cad2006-03-15 11:52:09 +110036#include <signal.h>
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000037
38#ifdef SKEY
39#include <skey.h>
40#endif
41
Damien Miller03e20032006-03-15 11:16:59 +110042#include <openssl/dh.h>
43
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000044#include "ssh.h"
45#include "auth.h"
46#include "kex.h"
47#include "dh.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000048#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
49#undef TARGET_OS_MAC
Ben Lindstrom1b9f2a62004-04-08 05:11:03 +000050#include "zlib.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000051#define TARGET_OS_MAC 1
52#else
53#include "zlib.h"
54#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000055#include "packet.h"
56#include "auth-options.h"
57#include "sshpty.h"
58#include "channels.h"
59#include "session.h"
60#include "sshlogin.h"
61#include "canohost.h"
62#include "log.h"
63#include "servconf.h"
64#include "monitor.h"
65#include "monitor_mm.h"
66#include "monitor_wrap.h"
67#include "monitor_fdpass.h"
68#include "xmalloc.h"
69#include "misc.h"
70#include "buffer.h"
71#include "bufaux.h"
72#include "compat.h"
73#include "ssh2.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000074
Darren Tucker0efd1552003-08-26 11:49:55 +100075#ifdef GSSAPI
76#include "ssh-gss.h"
77static Gssctxt *gsscontext = NULL;
78#endif
79
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000080/* Imports */
81extern ServerOptions options;
82extern u_int utmp_len;
83extern Newkeys *current_keys[];
84extern z_stream incoming_stream;
85extern z_stream outgoing_stream;
86extern u_char session_id[];
87extern Buffer input, output;
88extern Buffer auth_debug;
89extern int auth_debug_init;
Darren Tucker09991742004-07-17 17:05:14 +100090extern Buffer loginmsg;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000091
92/* State exported from the child */
93
94struct {
95 z_stream incoming;
96 z_stream outgoing;
97 u_char *keyin;
98 u_int keyinlen;
99 u_char *keyout;
100 u_int keyoutlen;
101 u_char *ivin;
102 u_int ivinlen;
103 u_char *ivout;
104 u_int ivoutlen;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000105 u_char *ssh1key;
106 u_int ssh1keylen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000107 int ssh1cipher;
108 int ssh1protoflags;
109 u_char *input;
110 u_int ilen;
111 u_char *output;
112 u_int olen;
113} child_state;
114
Damien Miller469954d2003-06-18 20:25:33 +1000115/* Functions on the monitor that answer unprivileged requests */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000116
117int mm_answer_moduli(int, Buffer *);
118int mm_answer_sign(int, Buffer *);
119int mm_answer_pwnamallow(int, Buffer *);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000120int mm_answer_auth2_read_banner(int, Buffer *);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000121int mm_answer_authserv(int, Buffer *);
122int mm_answer_authpassword(int, Buffer *);
123int mm_answer_bsdauthquery(int, Buffer *);
124int mm_answer_bsdauthrespond(int, Buffer *);
125int mm_answer_skeyquery(int, Buffer *);
126int mm_answer_skeyrespond(int, Buffer *);
127int mm_answer_keyallowed(int, Buffer *);
128int mm_answer_keyverify(int, Buffer *);
129int mm_answer_pty(int, Buffer *);
130int mm_answer_pty_cleanup(int, Buffer *);
131int mm_answer_term(int, Buffer *);
132int mm_answer_rsa_keyallowed(int, Buffer *);
133int mm_answer_rsa_challenge(int, Buffer *);
134int mm_answer_rsa_response(int, Buffer *);
135int mm_answer_sesskey(int, Buffer *);
136int mm_answer_sessid(int, Buffer *);
137
Damien Miller79418552002-04-23 20:28:48 +1000138#ifdef USE_PAM
139int mm_answer_pam_start(int, Buffer *);
Damien Miller1f499fd2003-08-25 13:08:49 +1000140int mm_answer_pam_account(int, Buffer *);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000141int mm_answer_pam_init_ctx(int, Buffer *);
142int mm_answer_pam_query(int, Buffer *);
143int mm_answer_pam_respond(int, Buffer *);
144int mm_answer_pam_free_ctx(int, Buffer *);
Damien Miller79418552002-04-23 20:28:48 +1000145#endif
146
Darren Tucker0efd1552003-08-26 11:49:55 +1000147#ifdef GSSAPI
148int mm_answer_gss_setup_ctx(int, Buffer *);
149int mm_answer_gss_accept_ctx(int, Buffer *);
150int mm_answer_gss_userok(int, Buffer *);
Damien Miller0425d402003-11-17 22:18:21 +1100151int mm_answer_gss_checkmic(int, Buffer *);
Darren Tucker0efd1552003-08-26 11:49:55 +1000152#endif
Damien Miller25162f22002-09-12 09:47:29 +1000153
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100154#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100155int mm_answer_audit_event(int, Buffer *);
156int mm_answer_audit_command(int, Buffer *);
157#endif
158
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000159static Authctxt *authctxt;
160static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
161
162/* local state for key verify */
163static u_char *key_blob = NULL;
164static u_int key_bloblen = 0;
165static int key_blobtype = MM_NOKEY;
Damien Millera10f5612002-09-12 09:49:15 +1000166static char *hostbased_cuser = NULL;
167static char *hostbased_chost = NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000168static char *auth_method = "unknown";
Darren Tucker502d3842003-06-28 12:38:01 +1000169static u_int session_id2_len = 0;
Ben Lindstromf67e0772002-06-06 20:58:19 +0000170static u_char *session_id2 = NULL;
Damien Millerbe64d432003-05-14 19:31:12 +1000171static pid_t monitor_child_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000172
173struct mon_table {
174 enum monitor_reqtype type;
175 int flags;
176 int (*f)(int, Buffer *);
177};
178
179#define MON_ISAUTH 0x0004 /* Required for Authentication */
180#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
181#define MON_ONCE 0x0010 /* Disable after calling */
182
183#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
184
185#define MON_PERMIT 0x1000 /* Request is permitted */
186
187struct mon_table mon_dispatch_proto20[] = {
188 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
189 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
190 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
191 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
Damien Miller5ad9fd92002-05-13 11:07:41 +1000192 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000193 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller79418552002-04-23 20:28:48 +1000194#ifdef USE_PAM
195 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000196 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000197 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
198 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
199 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
200 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Kevin Stevesbd1901b2002-04-01 18:04:35 +0000201#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100202#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100203 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100204#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000205#ifdef BSD_AUTH
206 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100207 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000208#endif
209#ifdef SKEY
210 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
211 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
212#endif
213 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
214 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
Darren Tucker0efd1552003-08-26 11:49:55 +1000215#ifdef GSSAPI
216 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
217 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
218 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
Damien Miller0425d402003-11-17 22:18:21 +1100219 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
Darren Tucker0efd1552003-08-26 11:49:55 +1000220#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000221 {0, 0, NULL}
222};
223
224struct mon_table mon_dispatch_postauth20[] = {
225 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
226 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
227 {MONITOR_REQ_PTY, 0, mm_answer_pty},
228 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
229 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100230#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100231 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
232 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
233#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000234 {0, 0, NULL}
235};
236
237struct mon_table mon_dispatch_proto15[] = {
238 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
239 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
240 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
241 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
242 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
243 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
244 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
245 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
246#ifdef BSD_AUTH
247 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100248 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000249#endif
250#ifdef SKEY
251 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
252 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
253#endif
Damien Millera33501b2002-05-08 12:24:42 +1000254#ifdef USE_PAM
255 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000256 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000257 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
258 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
259 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
260 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Damien Millera33501b2002-05-08 12:24:42 +1000261#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100262#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100263 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100264#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000265 {0, 0, NULL}
266};
267
268struct mon_table mon_dispatch_postauth15[] = {
269 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
270 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
271 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100272#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100273 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker3745e2b2005-03-06 22:31:35 +1100274 {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100275#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000276 {0, 0, NULL}
277};
278
279struct mon_table *mon_dispatch;
280
281/* Specifies if a certain message is allowed at the moment */
282
283static void
284monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
285{
286 while (ent->f != NULL) {
287 if (ent->type == type) {
288 ent->flags &= ~MON_PERMIT;
289 ent->flags |= permit ? MON_PERMIT : 0;
290 return;
291 }
292 ent++;
293 }
294}
295
296static void
297monitor_permit_authentications(int permit)
298{
299 struct mon_table *ent = mon_dispatch;
300
301 while (ent->f != NULL) {
302 if (ent->flags & MON_AUTH) {
303 ent->flags &= ~MON_PERMIT;
304 ent->flags |= permit ? MON_PERMIT : 0;
305 }
306 ent++;
307 }
308}
309
Darren Tucker3e33cec2003-10-02 16:12:36 +1000310void
311monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000312{
313 struct mon_table *ent;
314 int authenticated = 0;
315
316 debug3("preauth child monitor started");
317
Darren Tucker3e33cec2003-10-02 16:12:36 +1000318 authctxt = _authctxt;
319 memset(authctxt, 0, sizeof(*authctxt));
320
Darren Tuckerde0de392005-03-31 23:52:04 +1000321 authctxt->loginmsg = &loginmsg;
322
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000323 if (compat20) {
324 mon_dispatch = mon_dispatch_proto20;
325
326 /* Permit requests for moduli and signatures */
327 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
328 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
329 } else {
330 mon_dispatch = mon_dispatch_proto15;
331
332 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
333 }
334
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000335 /* The first few requests do not require asynchronous access */
336 while (!authenticated) {
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000337 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000338 if (authenticated) {
339 if (!(ent->flags & MON_AUTHDECIDE))
340 fatal("%s: unexpected authentication from %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000341 __func__, ent->type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000342 if (authctxt->pw->pw_uid == 0 &&
343 !auth_root_allowed(auth_method))
344 authenticated = 0;
Damien Miller1f499fd2003-08-25 13:08:49 +1000345#ifdef USE_PAM
346 /* PAM needs to perform account checks after auth */
Damien Miller6aef38f2003-11-18 10:45:20 +1100347 if (options.use_pam && authenticated) {
Damien Miller1f499fd2003-08-25 13:08:49 +1000348 Buffer m;
349
350 buffer_init(&m);
Damien Millera8e06ce2003-11-21 23:48:55 +1100351 mm_request_receive_expect(pmonitor->m_sendfd,
Damien Miller1f499fd2003-08-25 13:08:49 +1000352 MONITOR_REQ_PAM_ACCOUNT, &m);
353 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
354 buffer_free(&m);
355 }
356#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000357 }
358
359 if (ent->flags & MON_AUTHDECIDE) {
360 auth_log(authctxt, authenticated, auth_method,
361 compat20 ? " ssh2" : "");
362 if (!authenticated)
363 authctxt->failures++;
364 }
365 }
366
367 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000368 fatal("%s: authenticated invalid user", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000369
370 debug("%s: %s has been authenticated by privileged process",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000371 __func__, authctxt->user);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000372
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000373 mm_get_keystate(pmonitor);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000374}
375
Damien Millerbe64d432003-05-14 19:31:12 +1000376static void
377monitor_set_child_handler(pid_t pid)
378{
379 monitor_child_pid = pid;
380}
381
382static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000383monitor_child_handler(int sig)
Damien Millerbe64d432003-05-14 19:31:12 +1000384{
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000385 kill(monitor_child_pid, sig);
Damien Millerbe64d432003-05-14 19:31:12 +1000386}
387
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000388void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000389monitor_child_postauth(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000390{
Damien Millerbe64d432003-05-14 19:31:12 +1000391 monitor_set_child_handler(pmonitor->m_pid);
392 signal(SIGHUP, &monitor_child_handler);
393 signal(SIGTERM, &monitor_child_handler);
394
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000395 if (compat20) {
396 mon_dispatch = mon_dispatch_postauth20;
397
398 /* Permit requests for moduli and signatures */
399 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
400 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
401 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000402 } else {
403 mon_dispatch = mon_dispatch_postauth15;
404 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
405 }
406 if (!no_pty_flag) {
407 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
408 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
409 }
410
411 for (;;)
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000412 monitor_read(pmonitor, mon_dispatch, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000413}
414
415void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000416monitor_sync(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000417{
Damien Miller2d6b8332002-06-21 15:59:49 +1000418 if (options.compression) {
419 /* The member allocation is not visible, so sync it */
420 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
421 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000422}
423
424int
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000425monitor_read(struct monitor *pmonitor, struct mon_table *ent,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000426 struct mon_table **pent)
427{
428 Buffer m;
429 int ret;
430 u_char type;
431
432 buffer_init(&m);
433
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000434 mm_request_receive(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000435 type = buffer_get_char(&m);
436
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000437 debug3("%s: checking request %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000438
439 while (ent->f != NULL) {
440 if (ent->type == type)
441 break;
442 ent++;
443 }
444
445 if (ent->f != NULL) {
446 if (!(ent->flags & MON_PERMIT))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000447 fatal("%s: unpermitted request %d", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000448 type);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000449 ret = (*ent->f)(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000450 buffer_free(&m);
451
452 /* The child may use this request only once, disable it */
453 if (ent->flags & MON_ONCE) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000454 debug2("%s: %d used once, disabling now", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000455 type);
456 ent->flags &= ~MON_PERMIT;
457 }
458
459 if (pent != NULL)
460 *pent = ent;
461
462 return ret;
463 }
464
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000465 fatal("%s: unsupported request: %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000466
467 /* NOTREACHED */
468 return (-1);
469}
470
471/* allowed key state */
472static int
473monitor_allowed_key(u_char *blob, u_int bloblen)
474{
475 /* make sure key is allowed */
476 if (key_blob == NULL || key_bloblen != bloblen ||
477 memcmp(key_blob, blob, key_bloblen))
478 return (0);
479 return (1);
480}
481
482static void
483monitor_reset_key_state(void)
484{
485 /* reset state */
486 if (key_blob != NULL)
487 xfree(key_blob);
488 if (hostbased_cuser != NULL)
489 xfree(hostbased_cuser);
490 if (hostbased_chost != NULL)
491 xfree(hostbased_chost);
492 key_blob = NULL;
493 key_bloblen = 0;
494 key_blobtype = MM_NOKEY;
495 hostbased_cuser = NULL;
496 hostbased_chost = NULL;
497}
498
499int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000500mm_answer_moduli(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000501{
502 DH *dh;
503 int min, want, max;
504
505 min = buffer_get_int(m);
506 want = buffer_get_int(m);
507 max = buffer_get_int(m);
508
509 debug3("%s: got parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000510 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000511 /* We need to check here, too, in case the child got corrupted */
512 if (max < min || want < min || max < want)
513 fatal("%s: bad parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000514 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000515
516 buffer_clear(m);
517
518 dh = choose_dh(min, want, max);
519 if (dh == NULL) {
520 buffer_put_char(m, 0);
521 return (0);
522 } else {
523 /* Send first bignum */
524 buffer_put_char(m, 1);
525 buffer_put_bignum2(m, dh->p);
526 buffer_put_bignum2(m, dh->g);
527
528 DH_free(dh);
529 }
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000530 mm_request_send(sock, MONITOR_ANS_MODULI, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000531 return (0);
532}
533
534int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000535mm_answer_sign(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000536{
537 Key *key;
538 u_char *p;
539 u_char *signature;
540 u_int siglen, datlen;
541 int keyid;
542
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000543 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000544
545 keyid = buffer_get_int(m);
546 p = buffer_get_string(m, &datlen);
547
Damien Millera63128d2006-03-15 12:08:28 +1100548 /*
Damien Millerc91e5562006-03-26 13:58:55 +1100549 * Supported KEX types will only return SHA1 (20 byte) or
Damien Millera63128d2006-03-15 12:08:28 +1100550 * SHA256 (32 byte) hashes
551 */
552 if (datlen != 20 && datlen != 32)
Ben Lindstromd5502182002-06-27 00:12:57 +0000553 fatal("%s: data length incorrect: %u", __func__, datlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000554
Ben Lindstromf67e0772002-06-06 20:58:19 +0000555 /* save session id, it will be passed on the first call */
556 if (session_id2_len == 0) {
557 session_id2_len = datlen;
558 session_id2 = xmalloc(session_id2_len);
559 memcpy(session_id2, p, session_id2_len);
560 }
561
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000562 if ((key = get_hostkey_by_index(keyid)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000563 fatal("%s: no hostkey from index %d", __func__, keyid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000564 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000565 fatal("%s: key_sign failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000566
Ben Lindstromd5502182002-06-27 00:12:57 +0000567 debug3("%s: signature %p(%u)", __func__, signature, siglen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000568
569 buffer_clear(m);
570 buffer_put_string(m, signature, siglen);
571
572 xfree(p);
573 xfree(signature);
574
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000575 mm_request_send(sock, MONITOR_ANS_SIGN, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000576
577 /* Turn on permissions for getpwnam */
578 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
579
580 return (0);
581}
582
583/* Retrieves the password entry and also checks if the user is permitted */
584
585int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000586mm_answer_pwnamallow(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000587{
Darren Tuckerb09b6772004-06-22 15:06:46 +1000588 char *username;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000589 struct passwd *pwent;
590 int allowed = 0;
591
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000592 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000593
594 if (authctxt->attempt++ != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000595 fatal("%s: multiple attempts for getpwnam", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000596
Darren Tuckerb09b6772004-06-22 15:06:46 +1000597 username = buffer_get_string(m, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000598
Darren Tuckerb09b6772004-06-22 15:06:46 +1000599 pwent = getpwnamallow(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000600
Darren Tuckerb09b6772004-06-22 15:06:46 +1000601 authctxt->user = xstrdup(username);
602 setproctitle("%s [priv]", pwent ? username : "unknown");
603 xfree(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000604
605 buffer_clear(m);
606
607 if (pwent == NULL) {
608 buffer_put_char(m, 0);
Damien Millerf96d1832003-11-18 22:01:48 +1100609 authctxt->pw = fakepw();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000610 goto out;
611 }
612
613 allowed = 1;
614 authctxt->pw = pwent;
615 authctxt->valid = 1;
616
617 buffer_put_char(m, 1);
618 buffer_put_string(m, pwent, sizeof(struct passwd));
619 buffer_put_cstring(m, pwent->pw_name);
620 buffer_put_cstring(m, "*");
621 buffer_put_cstring(m, pwent->pw_gecos);
Kevin Steves7e147602002-03-22 18:07:17 +0000622#ifdef HAVE_PW_CLASS_IN_PASSWD
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000623 buffer_put_cstring(m, pwent->pw_class);
Kevin Steves7e147602002-03-22 18:07:17 +0000624#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000625 buffer_put_cstring(m, pwent->pw_dir);
626 buffer_put_cstring(m, pwent->pw_shell);
627
628 out:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000629 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000630 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000631
632 /* For SSHv1 allow authentication now */
633 if (!compat20)
634 monitor_permit_authentications(1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000635 else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000636 /* Allow service/style information on the auth context */
637 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000638 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
639 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000640
Damien Millera33501b2002-05-08 12:24:42 +1000641#ifdef USE_PAM
Damien Miller4e448a32003-05-14 15:11:48 +1000642 if (options.use_pam)
643 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
Damien Millera33501b2002-05-08 12:24:42 +1000644#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100645#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100646 monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1);
Darren Tucker269a1ea2005-02-03 00:20:53 +1100647#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000648
649 return (0);
650}
651
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000652int mm_answer_auth2_read_banner(int sock, Buffer *m)
Damien Miller5ad9fd92002-05-13 11:07:41 +1000653{
654 char *banner;
655
656 buffer_clear(m);
657 banner = auth2_read_banner();
658 buffer_put_cstring(m, banner != NULL ? banner : "");
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000659 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000660
661 if (banner != NULL)
Ben Lindstromeec16fc2002-07-04 00:06:15 +0000662 xfree(banner);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000663
664 return (0);
665}
666
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000667int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000668mm_answer_authserv(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000669{
670 monitor_permit_authentications(1);
671
672 authctxt->service = buffer_get_string(m, NULL);
673 authctxt->style = buffer_get_string(m, NULL);
674 debug3("%s: service=%s, style=%s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000675 __func__, authctxt->service, authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000676
677 if (strlen(authctxt->style) == 0) {
678 xfree(authctxt->style);
679 authctxt->style = NULL;
680 }
681
682 return (0);
683}
684
685int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000686mm_answer_authpassword(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000687{
688 static int call_count;
689 char *passwd;
Ben Lindstrom7cea16b2002-07-23 21:13:40 +0000690 int authenticated;
691 u_int plen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000692
693 passwd = buffer_get_string(m, &plen);
694 /* Only authenticate if the context is valid */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000695 authenticated = options.password_authentication &&
Damien Miller856f0be2003-09-03 07:32:45 +1000696 auth_password(authctxt, passwd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000697 memset(passwd, 0, strlen(passwd));
698 xfree(passwd);
699
700 buffer_clear(m);
701 buffer_put_int(m, authenticated);
702
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000703 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000704 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000705
706 call_count++;
707 if (plen == 0 && call_count == 1)
708 auth_method = "none";
709 else
710 auth_method = "password";
711
712 /* Causes monitor loop to terminate if authenticated */
713 return (authenticated);
714}
715
716#ifdef BSD_AUTH
717int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000718mm_answer_bsdauthquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000719{
720 char *name, *infotxt;
721 u_int numprompts;
722 u_int *echo_on;
723 char **prompts;
Damien Millerb7df3af2003-02-24 11:55:46 +1100724 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000725
Damien Millerb7df3af2003-02-24 11:55:46 +1100726 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
727 &prompts, &echo_on) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000728
729 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100730 buffer_put_int(m, success);
731 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000732 buffer_put_cstring(m, prompts[0]);
733
Damien Millerb7df3af2003-02-24 11:55:46 +1100734 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000735 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000736
Damien Millerb7df3af2003-02-24 11:55:46 +1100737 if (success) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000738 xfree(name);
739 xfree(infotxt);
740 xfree(prompts);
741 xfree(echo_on);
742 }
743
744 return (0);
745}
746
747int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000748mm_answer_bsdauthrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000749{
750 char *response;
751 int authok;
752
753 if (authctxt->as == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000754 fatal("%s: no bsd auth session", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000755
756 response = buffer_get_string(m, NULL);
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000757 authok = options.challenge_response_authentication &&
758 auth_userresponse(authctxt->as, response, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000759 authctxt->as = NULL;
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000760 debug3("%s: <%s> = <%d>", __func__, response, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000761 xfree(response);
762
763 buffer_clear(m);
764 buffer_put_int(m, authok);
765
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000766 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000767 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000768
769 auth_method = "bsdauth";
770
771 return (authok != 0);
772}
773#endif
774
775#ifdef SKEY
776int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000777mm_answer_skeyquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000778{
779 struct skey skey;
780 char challenge[1024];
Damien Millerb7df3af2003-02-24 11:55:46 +1100781 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000782
Darren Tucker06a8cfe2004-04-14 17:24:30 +1000783 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
784 sizeof(challenge)) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000785
786 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100787 buffer_put_int(m, success);
788 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000789 buffer_put_cstring(m, challenge);
790
Damien Millerb7df3af2003-02-24 11:55:46 +1100791 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000792 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000793
794 return (0);
795}
796
797int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000798mm_answer_skeyrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000799{
800 char *response;
801 int authok;
802
803 response = buffer_get_string(m, NULL);
804
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000805 authok = (options.challenge_response_authentication &&
806 authctxt->valid &&
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000807 skey_haskey(authctxt->pw->pw_name) == 0 &&
808 skey_passcheck(authctxt->pw->pw_name, response) != -1);
809
810 xfree(response);
811
812 buffer_clear(m);
813 buffer_put_int(m, authok);
814
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000815 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000816 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000817
818 auth_method = "skey";
819
820 return (authok != 0);
821}
822#endif
823
Damien Miller79418552002-04-23 20:28:48 +1000824#ifdef USE_PAM
825int
Darren Tucker7eda5922004-06-22 13:22:50 +1000826mm_answer_pam_start(int sock, Buffer *m)
Damien Miller79418552002-04-23 20:28:48 +1000827{
Damien Miller4e448a32003-05-14 15:11:48 +1000828 if (!options.use_pam)
829 fatal("UsePAM not set, but ended up in %s anyway", __func__);
830
Darren Tuckerdbf7a742004-03-08 23:04:06 +1100831 start_pam(authctxt);
Damien Miller79418552002-04-23 20:28:48 +1000832
Damien Miller1f499fd2003-08-25 13:08:49 +1000833 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
834
Damien Miller79418552002-04-23 20:28:48 +1000835 return (0);
836}
Damien Miller4f9f42a2003-05-10 19:28:02 +1000837
Damien Miller1f499fd2003-08-25 13:08:49 +1000838int
Darren Tucker7eda5922004-06-22 13:22:50 +1000839mm_answer_pam_account(int sock, Buffer *m)
Damien Miller1f499fd2003-08-25 13:08:49 +1000840{
841 u_int ret;
Damien Miller787b2ec2003-11-21 23:56:47 +1100842
Damien Miller1f499fd2003-08-25 13:08:49 +1000843 if (!options.use_pam)
844 fatal("UsePAM not set, but ended up in %s anyway", __func__);
845
846 ret = do_pam_account();
847
848 buffer_put_int(m, ret);
Darren Tuckerd4f04ae2005-09-30 10:23:21 +1000849 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
Damien Miller1f499fd2003-08-25 13:08:49 +1000850
Darren Tucker7eda5922004-06-22 13:22:50 +1000851 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
Damien Miller1f499fd2003-08-25 13:08:49 +1000852
853 return (ret);
854}
855
Damien Miller4f9f42a2003-05-10 19:28:02 +1000856static void *sshpam_ctxt, *sshpam_authok;
857extern KbdintDevice sshpam_device;
858
859int
Darren Tucker7eda5922004-06-22 13:22:50 +1000860mm_answer_pam_init_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000861{
862
863 debug3("%s", __func__);
864 authctxt->user = buffer_get_string(m, NULL);
865 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
866 sshpam_authok = NULL;
867 buffer_clear(m);
868 if (sshpam_ctxt != NULL) {
869 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
870 buffer_put_int(m, 1);
871 } else {
872 buffer_put_int(m, 0);
873 }
Darren Tucker7eda5922004-06-22 13:22:50 +1000874 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000875 return (0);
876}
877
878int
Darren Tucker7eda5922004-06-22 13:22:50 +1000879mm_answer_pam_query(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000880{
881 char *name, *info, **prompts;
Damien Miller04b65332005-07-17 17:53:31 +1000882 u_int i, num, *echo_on;
883 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000884
885 debug3("%s", __func__);
886 sshpam_authok = NULL;
887 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
888 if (ret == 0 && num == 0)
889 sshpam_authok = sshpam_ctxt;
890 if (num > 1 || name == NULL || info == NULL)
891 ret = -1;
892 buffer_clear(m);
893 buffer_put_int(m, ret);
894 buffer_put_cstring(m, name);
895 xfree(name);
896 buffer_put_cstring(m, info);
897 xfree(info);
898 buffer_put_int(m, num);
899 for (i = 0; i < num; ++i) {
900 buffer_put_cstring(m, prompts[i]);
901 xfree(prompts[i]);
902 buffer_put_int(m, echo_on[i]);
903 }
904 if (prompts != NULL)
905 xfree(prompts);
906 if (echo_on != NULL)
907 xfree(echo_on);
Darren Tucker7eda5922004-06-22 13:22:50 +1000908 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000909 return (0);
910}
911
912int
Darren Tucker7eda5922004-06-22 13:22:50 +1000913mm_answer_pam_respond(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000914{
915 char **resp;
Damien Miller04b65332005-07-17 17:53:31 +1000916 u_int i, num;
917 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000918
919 debug3("%s", __func__);
920 sshpam_authok = NULL;
921 num = buffer_get_int(m);
922 if (num > 0) {
923 resp = xmalloc(num * sizeof(char *));
924 for (i = 0; i < num; ++i)
925 resp[i] = buffer_get_string(m, NULL);
926 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
927 for (i = 0; i < num; ++i)
928 xfree(resp[i]);
929 xfree(resp);
930 } else {
931 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
932 }
933 buffer_clear(m);
934 buffer_put_int(m, ret);
Darren Tucker7eda5922004-06-22 13:22:50 +1000935 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000936 auth_method = "keyboard-interactive/pam";
937 if (ret == 0)
938 sshpam_authok = sshpam_ctxt;
939 return (0);
940}
941
942int
Darren Tucker7eda5922004-06-22 13:22:50 +1000943mm_answer_pam_free_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000944{
945
946 debug3("%s", __func__);
947 (sshpam_device.free_ctx)(sshpam_ctxt);
948 buffer_clear(m);
Darren Tucker7eda5922004-06-22 13:22:50 +1000949 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000950 return (sshpam_authok == sshpam_ctxt);
951}
Damien Miller79418552002-04-23 20:28:48 +1000952#endif
953
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000954static void
955mm_append_debug(Buffer *m)
956{
957 if (auth_debug_init && buffer_len(&auth_debug)) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000958 debug3("%s: Appending debug messages for child", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000959 buffer_append(m, buffer_ptr(&auth_debug),
960 buffer_len(&auth_debug));
961 buffer_clear(&auth_debug);
962 }
963}
964
965int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000966mm_answer_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000967{
968 Key *key;
Damien Millera10f5612002-09-12 09:49:15 +1000969 char *cuser, *chost;
970 u_char *blob;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000971 u_int bloblen;
972 enum mm_keytype type = 0;
973 int allowed = 0;
974
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000975 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000976
977 type = buffer_get_int(m);
978 cuser = buffer_get_string(m, NULL);
979 chost = buffer_get_string(m, NULL);
980 blob = buffer_get_string(m, &bloblen);
981
982 key = key_from_blob(blob, bloblen);
983
984 if ((compat20 && type == MM_RSAHOSTKEY) ||
985 (!compat20 && type != MM_RSAHOSTKEY))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000986 fatal("%s: key type and protocol mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000987
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000988 debug3("%s: key_from_blob: %p", __func__, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000989
Damien Miller3e3b5142003-11-17 21:13:40 +1100990 if (key != NULL && authctxt->valid) {
Darren Tucker47eede72005-03-14 23:08:12 +1100991 switch (type) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000992 case MM_USERKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000993 allowed = options.pubkey_authentication &&
994 user_key_allowed(authctxt->pw, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000995 break;
996 case MM_HOSTKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000997 allowed = options.hostbased_authentication &&
998 hostbased_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000999 cuser, chost, key);
1000 break;
1001 case MM_RSAHOSTKEY:
1002 key->type = KEY_RSA1; /* XXX */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001003 allowed = options.rhosts_rsa_authentication &&
1004 auth_rhosts_rsa_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001005 cuser, chost, key);
1006 break;
1007 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001008 fatal("%s: unknown key type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001009 break;
1010 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001011 }
Damien Miller00111382003-03-10 11:21:17 +11001012 if (key != NULL)
1013 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001014
1015 /* clear temporarily storage (used by verify) */
1016 monitor_reset_key_state();
1017
1018 if (allowed) {
1019 /* Save temporarily for comparison in verify */
1020 key_blob = blob;
1021 key_bloblen = bloblen;
1022 key_blobtype = type;
1023 hostbased_cuser = cuser;
1024 hostbased_chost = chost;
Damien Miller96937bd2006-03-26 14:01:54 +11001025 } else {
1026 xfree(blob);
1027 xfree(cuser);
1028 xfree(chost);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001029 }
1030
1031 debug3("%s: key %p is %s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001032 __func__, key, allowed ? "allowed" : "disallowed");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001033
1034 buffer_clear(m);
1035 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001036 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001037
1038 mm_append_debug(m);
1039
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001040 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001041
1042 if (type == MM_RSAHOSTKEY)
1043 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1044
1045 return (0);
1046}
1047
1048static int
1049monitor_valid_userblob(u_char *data, u_int datalen)
1050{
1051 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001052 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001053 u_int len;
1054 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001055
1056 buffer_init(&b);
1057 buffer_append(&b, data, datalen);
1058
1059 if (datafellows & SSH_OLD_SESSIONID) {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001060 p = buffer_ptr(&b);
1061 len = buffer_len(&b);
1062 if ((session_id2 == NULL) ||
1063 (len < session_id2_len) ||
1064 (memcmp(p, session_id2, session_id2_len) != 0))
1065 fail++;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001066 buffer_consume(&b, session_id2_len);
1067 } else {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001068 p = buffer_get_string(&b, &len);
1069 if ((session_id2 == NULL) ||
1070 (len != session_id2_len) ||
1071 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001072 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001073 xfree(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001074 }
1075 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1076 fail++;
1077 p = buffer_get_string(&b, NULL);
1078 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001079 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001080 authctxt->user, p);
1081 fail++;
1082 }
1083 xfree(p);
1084 buffer_skip_string(&b);
1085 if (datafellows & SSH_BUG_PKAUTH) {
1086 if (!buffer_get_char(&b))
1087 fail++;
1088 } else {
1089 p = buffer_get_string(&b, NULL);
1090 if (strcmp("publickey", p) != 0)
1091 fail++;
1092 xfree(p);
1093 if (!buffer_get_char(&b))
1094 fail++;
1095 buffer_skip_string(&b);
1096 }
1097 buffer_skip_string(&b);
1098 if (buffer_len(&b) != 0)
1099 fail++;
1100 buffer_free(&b);
1101 return (fail == 0);
1102}
1103
1104static int
Damien Millera10f5612002-09-12 09:49:15 +10001105monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1106 char *chost)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001107{
1108 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001109 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001110 u_int len;
1111 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001112
1113 buffer_init(&b);
1114 buffer_append(&b, data, datalen);
1115
Ben Lindstromf67e0772002-06-06 20:58:19 +00001116 p = buffer_get_string(&b, &len);
1117 if ((session_id2 == NULL) ||
1118 (len != session_id2_len) ||
1119 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001120 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001121 xfree(p);
1122
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001123 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1124 fail++;
1125 p = buffer_get_string(&b, NULL);
1126 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001127 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001128 authctxt->user, p);
1129 fail++;
1130 }
1131 xfree(p);
1132 buffer_skip_string(&b); /* service */
1133 p = buffer_get_string(&b, NULL);
1134 if (strcmp(p, "hostbased") != 0)
1135 fail++;
1136 xfree(p);
1137 buffer_skip_string(&b); /* pkalg */
1138 buffer_skip_string(&b); /* pkblob */
1139
1140 /* verify client host, strip trailing dot if necessary */
1141 p = buffer_get_string(&b, NULL);
1142 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1143 p[len - 1] = '\0';
1144 if (strcmp(p, chost) != 0)
1145 fail++;
1146 xfree(p);
1147
1148 /* verify client user */
1149 p = buffer_get_string(&b, NULL);
1150 if (strcmp(p, cuser) != 0)
1151 fail++;
1152 xfree(p);
1153
1154 if (buffer_len(&b) != 0)
1155 fail++;
1156 buffer_free(&b);
1157 return (fail == 0);
1158}
1159
1160int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001161mm_answer_keyverify(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001162{
1163 Key *key;
1164 u_char *signature, *data, *blob;
1165 u_int signaturelen, datalen, bloblen;
1166 int verified = 0;
1167 int valid_data = 0;
1168
1169 blob = buffer_get_string(m, &bloblen);
1170 signature = buffer_get_string(m, &signaturelen);
1171 data = buffer_get_string(m, &datalen);
1172
1173 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
Ben Lindstromb57a4bf2002-03-27 18:00:59 +00001174 !monitor_allowed_key(blob, bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001175 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001176
1177 key = key_from_blob(blob, bloblen);
1178 if (key == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001179 fatal("%s: bad public key blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001180
1181 switch (key_blobtype) {
1182 case MM_USERKEY:
1183 valid_data = monitor_valid_userblob(data, datalen);
1184 break;
1185 case MM_HOSTKEY:
1186 valid_data = monitor_valid_hostbasedblob(data, datalen,
1187 hostbased_cuser, hostbased_chost);
1188 break;
1189 default:
1190 valid_data = 0;
1191 break;
1192 }
1193 if (!valid_data)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001194 fatal("%s: bad signature data blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001195
1196 verified = key_verify(key, signature, signaturelen, data, datalen);
1197 debug3("%s: key %p signature %s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001198 __func__, key, verified ? "verified" : "unverified");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001199
1200 key_free(key);
1201 xfree(blob);
1202 xfree(signature);
1203 xfree(data);
1204
Ben Lindstrome1c09122002-06-23 00:38:24 +00001205 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1206
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001207 monitor_reset_key_state();
1208
1209 buffer_clear(m);
1210 buffer_put_int(m, verified);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001211 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001212
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001213 return (verified);
1214}
1215
1216static void
1217mm_record_login(Session *s, struct passwd *pw)
1218{
1219 socklen_t fromlen;
1220 struct sockaddr_storage from;
1221
1222 /*
1223 * Get IP address of client. If the connection is not a socket, let
1224 * the address be 0.0.0.0.
1225 */
1226 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +10001227 fromlen = sizeof(from);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001228 if (packet_connection_is_on_socket()) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001229 if (getpeername(packet_get_connection_in(),
Damien Miller9f3bd532006-03-26 14:07:52 +11001230 (struct sockaddr *)&from, &fromlen) < 0) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001231 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +10001232 cleanup_exit(255);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001233 }
1234 }
1235 /* Record that there was a login on that tty from the remote host. */
1236 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
Damien Miller3a961dc2003-06-03 10:25:48 +10001237 get_remote_name_or_ip(utmp_len, options.use_dns),
Damien Millerebc23062002-09-04 16:45:09 +10001238 (struct sockaddr *)&from, fromlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001239}
1240
1241static void
1242mm_session_close(Session *s)
1243{
Damien Miller04bd8b02003-05-25 14:38:33 +10001244 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001245 if (s->ttyfd != -1) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001246 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001247 session_pty_cleanup2(s);
1248 }
1249 s->used = 0;
1250}
1251
1252int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001253mm_answer_pty(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001254{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001255 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001256 Session *s;
1257 int res, fd0;
1258
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001259 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001260
1261 buffer_clear(m);
1262 s = session_new();
1263 if (s == NULL)
1264 goto error;
1265 s->authctxt = authctxt;
1266 s->pw = authctxt->pw;
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001267 s->pid = pmonitor->m_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001268 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1269 if (res == 0)
1270 goto error;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001271 pty_setowner(authctxt->pw, s->tty);
1272
1273 buffer_put_int(m, 1);
1274 buffer_put_cstring(m, s->tty);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001275
1276 /* We need to trick ttyslot */
1277 if (dup2(s->ttyfd, 0) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001278 fatal("%s: dup2", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001279
1280 mm_record_login(s, authctxt->pw);
1281
1282 /* Now we can close the file descriptor again */
1283 close(0);
1284
Darren Tucker09991742004-07-17 17:05:14 +10001285 /* send messages generated by record_login */
1286 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1287 buffer_clear(&loginmsg);
1288
1289 mm_request_send(sock, MONITOR_ANS_PTY, m);
1290
1291 mm_send_fd(sock, s->ptyfd);
1292 mm_send_fd(sock, s->ttyfd);
1293
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001294 /* make sure nothing uses fd 0 */
1295 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001296 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001297 if (fd0 != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001298 error("%s: fd0 %d != 0", __func__, fd0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001299
1300 /* slave is not needed */
1301 close(s->ttyfd);
1302 s->ttyfd = s->ptyfd;
1303 /* no need to dup() because nobody closes ptyfd */
1304 s->ptymaster = s->ptyfd;
1305
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001306 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001307
1308 return (0);
1309
1310 error:
1311 if (s != NULL)
1312 mm_session_close(s);
1313 buffer_put_int(m, 0);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001314 mm_request_send(sock, MONITOR_ANS_PTY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001315 return (0);
1316}
1317
1318int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001319mm_answer_pty_cleanup(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001320{
1321 Session *s;
1322 char *tty;
1323
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001324 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001325
1326 tty = buffer_get_string(m, NULL);
1327 if ((s = session_by_tty(tty)) != NULL)
1328 mm_session_close(s);
1329 buffer_clear(m);
1330 xfree(tty);
1331 return (0);
1332}
1333
1334int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001335mm_answer_sesskey(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001336{
1337 BIGNUM *p;
1338 int rsafail;
1339
1340 /* Turn off permissions */
Darren Tucker5b530262005-02-09 09:52:17 +11001341 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001342
1343 if ((p = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001344 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001345
1346 buffer_get_bignum2(m, p);
1347
1348 rsafail = ssh1_session_key(p);
1349
1350 buffer_clear(m);
1351 buffer_put_int(m, rsafail);
1352 buffer_put_bignum2(m, p);
1353
1354 BN_clear_free(p);
1355
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001356 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001357
1358 /* Turn on permissions for sessid passing */
1359 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1360
1361 return (0);
1362}
1363
1364int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001365mm_answer_sessid(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001366{
1367 int i;
1368
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001369 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001370
1371 if (buffer_len(m) != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001372 fatal("%s: bad ssh1 session id", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001373 for (i = 0; i < 16; i++)
1374 session_id[i] = buffer_get_char(m);
1375
1376 /* Turn on permissions for getpwnam */
1377 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1378
1379 return (0);
1380}
1381
1382int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001383mm_answer_rsa_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001384{
1385 BIGNUM *client_n;
1386 Key *key = NULL;
1387 u_char *blob = NULL;
1388 u_int blen = 0;
1389 int allowed = 0;
1390
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001391 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001392
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001393 if (options.rsa_authentication && authctxt->valid) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001394 if ((client_n = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001395 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001396 buffer_get_bignum2(m, client_n);
1397 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1398 BN_clear_free(client_n);
1399 }
1400 buffer_clear(m);
1401 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001402 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001403
1404 /* clear temporarily storage (used by generate challenge) */
1405 monitor_reset_key_state();
1406
1407 if (allowed && key != NULL) {
1408 key->type = KEY_RSA; /* cheat for key_to_blob */
1409 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001410 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001411 buffer_put_string(m, blob, blen);
1412
1413 /* Save temporarily for comparison in verify */
1414 key_blob = blob;
1415 key_bloblen = blen;
1416 key_blobtype = MM_RSAUSERKEY;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001417 }
Damien Miller00111382003-03-10 11:21:17 +11001418 if (key != NULL)
1419 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001420
1421 mm_append_debug(m);
1422
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001423 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001424
1425 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1426 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1427 return (0);
1428}
1429
1430int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001431mm_answer_rsa_challenge(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001432{
1433 Key *key = NULL;
1434 u_char *blob;
1435 u_int blen;
1436
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001437 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001438
1439 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001440 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001441 blob = buffer_get_string(m, &blen);
1442 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001443 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001444 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001445 fatal("%s: key type mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001446 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001447 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001448
1449 if (ssh1_challenge)
1450 BN_clear_free(ssh1_challenge);
1451 ssh1_challenge = auth_rsa_generate_challenge(key);
1452
1453 buffer_clear(m);
1454 buffer_put_bignum2(m, ssh1_challenge);
1455
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001456 debug3("%s sending reply", __func__);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001457 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001458
1459 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
Damien Miller00111382003-03-10 11:21:17 +11001460
1461 xfree(blob);
1462 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001463 return (0);
1464}
1465
1466int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001467mm_answer_rsa_response(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001468{
1469 Key *key = NULL;
1470 u_char *blob, *response;
1471 u_int blen, len;
1472 int success;
1473
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001474 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001475
1476 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001477 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001478 if (ssh1_challenge == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001479 fatal("%s: no ssh1_challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001480
1481 blob = buffer_get_string(m, &blen);
1482 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001483 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001484 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001485 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001486 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001487 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001488 response = buffer_get_string(m, &len);
1489 if (len != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001490 fatal("%s: received bad response to challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001491 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1492
Damien Miller00111382003-03-10 11:21:17 +11001493 xfree(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001494 key_free(key);
1495 xfree(response);
1496
1497 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1498
1499 /* reset state */
1500 BN_clear_free(ssh1_challenge);
1501 ssh1_challenge = NULL;
1502 monitor_reset_key_state();
1503
1504 buffer_clear(m);
1505 buffer_put_int(m, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001506 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001507
1508 return (success);
1509}
1510
1511int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001512mm_answer_term(int sock, Buffer *req)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001513{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001514 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001515 int res, status;
1516
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001517 debug3("%s: tearing down sessions", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001518
1519 /* The child is terminating */
1520 session_destroy_all(&mm_session_close);
1521
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001522 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
Ben Lindstrom47fd8112002-04-02 20:48:19 +00001523 if (errno != EINTR)
1524 exit(1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001525
1526 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1527
1528 /* Terminate process */
Darren Tucker1f8311c2004-05-13 16:39:33 +10001529 exit(res);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001530}
1531
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001532#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +11001533/* Report that an audit event occurred */
1534int
1535mm_answer_audit_event(int socket, Buffer *m)
1536{
1537 ssh_audit_event_t event;
1538
1539 debug3("%s entering", __func__);
1540
1541 event = buffer_get_int(m);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001542 switch(event) {
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001543 case SSH_AUTH_FAIL_PUBKEY:
1544 case SSH_AUTH_FAIL_HOSTBASED:
1545 case SSH_AUTH_FAIL_GSSAPI:
1546 case SSH_LOGIN_EXCEED_MAXTRIES:
1547 case SSH_LOGIN_ROOT_DENIED:
1548 case SSH_CONNECTION_CLOSE:
1549 case SSH_INVALID_USER:
Darren Tucker269a1ea2005-02-03 00:20:53 +11001550 audit_event(event);
1551 break;
1552 default:
1553 fatal("Audit event type %d not permitted", event);
1554 }
1555
1556 return (0);
1557}
1558
1559int
1560mm_answer_audit_command(int socket, Buffer *m)
1561{
1562 u_int len;
1563 char *cmd;
1564
1565 debug3("%s entering", __func__);
1566 cmd = buffer_get_string(m, &len);
1567 /* sanity check command, if so how? */
1568 audit_run_command(cmd);
1569 xfree(cmd);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001570 return (0);
1571}
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001572#endif /* SSH_AUDIT_EVENTS */
Darren Tucker269a1ea2005-02-03 00:20:53 +11001573
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001574void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001575monitor_apply_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001576{
1577 if (compat20) {
1578 set_newkeys(MODE_IN);
1579 set_newkeys(MODE_OUT);
1580 } else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001581 packet_set_protocol_flags(child_state.ssh1protoflags);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001582 packet_set_encryption_key(child_state.ssh1key,
1583 child_state.ssh1keylen, child_state.ssh1cipher);
1584 xfree(child_state.ssh1key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001585 }
1586
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001587 /* for rc4 and other stateful ciphers */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001588 packet_set_keycontext(MODE_OUT, child_state.keyout);
1589 xfree(child_state.keyout);
1590 packet_set_keycontext(MODE_IN, child_state.keyin);
1591 xfree(child_state.keyin);
1592
1593 if (!compat20) {
1594 packet_set_iv(MODE_OUT, child_state.ivout);
1595 xfree(child_state.ivout);
1596 packet_set_iv(MODE_IN, child_state.ivin);
1597 xfree(child_state.ivin);
1598 }
1599
1600 memcpy(&incoming_stream, &child_state.incoming,
1601 sizeof(incoming_stream));
1602 memcpy(&outgoing_stream, &child_state.outgoing,
1603 sizeof(outgoing_stream));
1604
1605 /* Update with new address */
Damien Miller2d6b8332002-06-21 15:59:49 +10001606 if (options.compression)
1607 mm_init_compression(pmonitor->m_zlib);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001608
1609 /* Network I/O buffers */
1610 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1611 buffer_clear(&input);
1612 buffer_append(&input, child_state.input, child_state.ilen);
1613 memset(child_state.input, 0, child_state.ilen);
1614 xfree(child_state.input);
1615
1616 buffer_clear(&output);
1617 buffer_append(&output, child_state.output, child_state.olen);
1618 memset(child_state.output, 0, child_state.olen);
1619 xfree(child_state.output);
1620}
1621
1622static Kex *
1623mm_get_kex(Buffer *m)
1624{
1625 Kex *kex;
1626 void *blob;
1627 u_int bloblen;
1628
Damien Miller07d86be2006-03-26 14:19:21 +11001629 kex = xcalloc(1, sizeof(*kex));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001630 kex->session_id = buffer_get_string(m, &kex->session_id_len);
Ben Lindstromf67e0772002-06-06 20:58:19 +00001631 if ((session_id2 == NULL) ||
1632 (kex->session_id_len != session_id2_len) ||
1633 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1634 fatal("mm_get_get: internal error: bad session id");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001635 kex->we_need = buffer_get_int(m);
Damien Millerb062c292003-03-24 09:12:09 +11001636 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
Damien Millerf675fc42004-06-15 10:30:09 +10001637 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
Damien Millerb062c292003-03-24 09:12:09 +11001638 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
Damien Millera63128d2006-03-15 12:08:28 +11001639 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001640 kex->server = 1;
1641 kex->hostkey_type = buffer_get_int(m);
1642 kex->kex_type = buffer_get_int(m);
1643 blob = buffer_get_string(m, &bloblen);
1644 buffer_init(&kex->my);
1645 buffer_append(&kex->my, blob, bloblen);
1646 xfree(blob);
1647 blob = buffer_get_string(m, &bloblen);
1648 buffer_init(&kex->peer);
1649 buffer_append(&kex->peer, blob, bloblen);
1650 xfree(blob);
1651 kex->done = 1;
1652 kex->flags = buffer_get_int(m);
1653 kex->client_version_string = buffer_get_string(m, NULL);
1654 kex->server_version_string = buffer_get_string(m, NULL);
1655 kex->load_host_key=&get_hostkey_by_type;
1656 kex->host_key_index=&get_hostkey_index;
1657
1658 return (kex);
1659}
1660
1661/* This function requries careful sanity checking */
1662
1663void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001664mm_get_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001665{
1666 Buffer m;
1667 u_char *blob, *p;
1668 u_int bloblen, plen;
Damien Millera5539d22003-04-09 20:50:06 +10001669 u_int32_t seqnr, packets;
1670 u_int64_t blocks;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001671
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001672 debug3("%s: Waiting for new keys", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001673
1674 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001675 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001676 if (!compat20) {
1677 child_state.ssh1protoflags = buffer_get_int(&m);
1678 child_state.ssh1cipher = buffer_get_int(&m);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001679 child_state.ssh1key = buffer_get_string(&m,
1680 &child_state.ssh1keylen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001681 child_state.ivout = buffer_get_string(&m,
1682 &child_state.ivoutlen);
1683 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1684 goto skip;
1685 } else {
1686 /* Get the Kex for rekeying */
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001687 *pmonitor->m_pkex = mm_get_kex(&m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001688 }
1689
1690 blob = buffer_get_string(&m, &bloblen);
1691 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1692 xfree(blob);
1693
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001694 debug3("%s: Waiting for second key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001695 blob = buffer_get_string(&m, &bloblen);
1696 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1697 xfree(blob);
1698
1699 /* Now get sequence numbers for the packets */
Damien Millera5539d22003-04-09 20:50:06 +10001700 seqnr = buffer_get_int(&m);
1701 blocks = buffer_get_int64(&m);
1702 packets = buffer_get_int(&m);
1703 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1704 seqnr = buffer_get_int(&m);
1705 blocks = buffer_get_int64(&m);
1706 packets = buffer_get_int(&m);
1707 packet_set_state(MODE_IN, seqnr, blocks, packets);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001708
1709 skip:
1710 /* Get the key context */
1711 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1712 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1713
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001714 debug3("%s: Getting compression state", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001715 /* Get compression state */
1716 p = buffer_get_string(&m, &plen);
1717 if (plen != sizeof(child_state.outgoing))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001718 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001719 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1720 xfree(p);
1721
1722 p = buffer_get_string(&m, &plen);
1723 if (plen != sizeof(child_state.incoming))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001724 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001725 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1726 xfree(p);
1727
1728 /* Network I/O buffers */
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001729 debug3("%s: Getting Network I/O buffers", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001730 child_state.input = buffer_get_string(&m, &child_state.ilen);
1731 child_state.output = buffer_get_string(&m, &child_state.olen);
1732
1733 buffer_free(&m);
1734}
1735
1736
1737/* Allocation functions for zlib */
1738void *
1739mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1740{
Ben Lindstrom41ee2b02002-11-09 15:47:47 +00001741 size_t len = (size_t) size * ncount;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001742 void *address;
1743
Ben Lindstrom0a4f7542002-08-20 18:36:25 +00001744 if (len == 0 || ncount > SIZE_T_MAX / size)
Damien Miller530a7542002-06-26 23:27:11 +10001745 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1746
1747 address = mm_malloc(mm, len);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001748
1749 return (address);
1750}
1751
1752void
1753mm_zfree(struct mm_master *mm, void *address)
1754{
1755 mm_free(mm, address);
1756}
1757
1758void
1759mm_init_compression(struct mm_master *mm)
1760{
1761 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1762 outgoing_stream.zfree = (free_func)mm_zfree;
1763 outgoing_stream.opaque = mm;
1764
1765 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1766 incoming_stream.zfree = (free_func)mm_zfree;
1767 incoming_stream.opaque = mm;
1768}
1769
1770/* XXX */
1771
1772#define FD_CLOSEONEXEC(x) do { \
1773 if (fcntl(x, F_SETFD, 1) == -1) \
1774 fatal("fcntl(%d, F_SETFD)", x); \
1775} while (0)
1776
1777static void
1778monitor_socketpair(int *pair)
1779{
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001780#ifdef HAVE_SOCKETPAIR
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001781 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001782 fatal("%s: socketpair", __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001783#else
1784 fatal("%s: UsePrivilegeSeparation=yes not supported",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001785 __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001786#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001787 FD_CLOSEONEXEC(pair[0]);
1788 FD_CLOSEONEXEC(pair[1]);
1789}
1790
1791#define MM_MEMSIZE 65536
1792
1793struct monitor *
1794monitor_init(void)
1795{
1796 struct monitor *mon;
1797 int pair[2];
1798
Damien Miller07d86be2006-03-26 14:19:21 +11001799 mon = xcalloc(1, sizeof(*mon));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001800
1801 monitor_socketpair(pair);
1802
1803 mon->m_recvfd = pair[0];
1804 mon->m_sendfd = pair[1];
1805
1806 /* Used to share zlib space across processes */
Damien Miller2d6b8332002-06-21 15:59:49 +10001807 if (options.compression) {
1808 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1809 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001810
Damien Miller2d6b8332002-06-21 15:59:49 +10001811 /* Compression needs to share state across borders */
1812 mm_init_compression(mon->m_zlib);
1813 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001814
1815 return mon;
1816}
1817
1818void
1819monitor_reinit(struct monitor *mon)
1820{
1821 int pair[2];
1822
1823 monitor_socketpair(pair);
1824
1825 mon->m_recvfd = pair[0];
1826 mon->m_sendfd = pair[1];
1827}
Darren Tucker0efd1552003-08-26 11:49:55 +10001828
1829#ifdef GSSAPI
1830int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001831mm_answer_gss_setup_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001832{
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001833 gss_OID_desc goid;
Darren Tucker0efd1552003-08-26 11:49:55 +10001834 OM_uint32 major;
1835 u_int len;
1836
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001837 goid.elements = buffer_get_string(m, &len);
1838 goid.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001839
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001840 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
Darren Tucker0efd1552003-08-26 11:49:55 +10001841
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001842 xfree(goid.elements);
Darren Tucker0efd1552003-08-26 11:49:55 +10001843
1844 buffer_clear(m);
1845 buffer_put_int(m, major);
1846
Damien Miller6fd6def2005-11-05 15:07:05 +11001847 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001848
1849 /* Now we have a context, enable the step */
1850 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1851
1852 return (0);
1853}
1854
1855int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001856mm_answer_gss_accept_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001857{
1858 gss_buffer_desc in;
1859 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
Damien Miller6fd6def2005-11-05 15:07:05 +11001860 OM_uint32 major, minor;
Darren Tucker0efd1552003-08-26 11:49:55 +10001861 OM_uint32 flags = 0; /* GSI needs this */
Darren Tucker600ad8d2003-08-26 12:10:48 +10001862 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001863
Darren Tucker600ad8d2003-08-26 12:10:48 +10001864 in.value = buffer_get_string(m, &len);
1865 in.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001866 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1867 xfree(in.value);
1868
1869 buffer_clear(m);
1870 buffer_put_int(m, major);
1871 buffer_put_string(m, out.value, out.length);
1872 buffer_put_int(m, flags);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001873 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001874
1875 gss_release_buffer(&minor, &out);
1876
Damien Miller6fd6def2005-11-05 15:07:05 +11001877 if (major == GSS_S_COMPLETE) {
Darren Tucker0efd1552003-08-26 11:49:55 +10001878 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1879 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller0425d402003-11-17 22:18:21 +11001880 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
Darren Tucker0efd1552003-08-26 11:49:55 +10001881 }
1882 return (0);
1883}
1884
1885int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001886mm_answer_gss_checkmic(int sock, Buffer *m)
Damien Miller0425d402003-11-17 22:18:21 +11001887{
1888 gss_buffer_desc gssbuf, mic;
1889 OM_uint32 ret;
1890 u_int len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001891
Damien Miller0425d402003-11-17 22:18:21 +11001892 gssbuf.value = buffer_get_string(m, &len);
1893 gssbuf.length = len;
1894 mic.value = buffer_get_string(m, &len);
1895 mic.length = len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001896
Damien Miller0425d402003-11-17 22:18:21 +11001897 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +11001898
Damien Miller0425d402003-11-17 22:18:21 +11001899 xfree(gssbuf.value);
1900 xfree(mic.value);
Damien Miller787b2ec2003-11-21 23:56:47 +11001901
Damien Miller0425d402003-11-17 22:18:21 +11001902 buffer_clear(m);
1903 buffer_put_int(m, ret);
Damien Miller787b2ec2003-11-21 23:56:47 +11001904
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001905 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
Damien Miller787b2ec2003-11-21 23:56:47 +11001906
Damien Miller0425d402003-11-17 22:18:21 +11001907 if (!GSS_ERROR(ret))
1908 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller787b2ec2003-11-21 23:56:47 +11001909
Damien Miller0425d402003-11-17 22:18:21 +11001910 return (0);
1911}
1912
1913int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001914mm_answer_gss_userok(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001915{
1916 int authenticated;
1917
1918 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1919
1920 buffer_clear(m);
1921 buffer_put_int(m, authenticated);
1922
1923 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001924 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001925
Damien Miller6fd6def2005-11-05 15:07:05 +11001926 auth_method = "gssapi-with-mic";
Darren Tucker0efd1552003-08-26 11:49:55 +10001927
1928 /* Monitor loop will terminate if authenticated */
1929 return (authenticated);
1930}
1931#endif /* GSSAPI */