blob: 2f23669cdca7737591df6ba54e51d28d41ed68e4 [file] [log] [blame]
Darren Tucker2f8b3d92007-12-02 23:02:15 +11001/* $OpenBSD: monitor.c,v 1.94 2007/10/29 04:08:08 dtucker 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>
Damien Miller8dbffe72006-08-05 11:02:17 +100031#include <sys/param.h>
Damien Millere3b60b52006-07-10 21:08:03 +100032#include <sys/socket.h>
Damien Millerd7834352006-08-05 12:39:39 +100033#include "openbsd-compat/sys-tree.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110034#include <sys/wait.h>
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000035
Darren Tucker39972492006-07-12 22:22:46 +100036#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100037#include <fcntl.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110038#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110039#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110040#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100041#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110042#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100043#include <stdarg.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100044#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100045#include <string.h>
Damien Miller607aede2006-09-01 15:48:19 +100046#include <unistd.h>
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000047
48#ifdef SKEY
49#include <skey.h>
50#endif
51
Damien Miller03e20032006-03-15 11:16:59 +110052#include <openssl/dh.h>
53
Damien Millerd7834352006-08-05 12:39:39 +100054#include "xmalloc.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000055#include "ssh.h"
Damien Millerd7834352006-08-05 12:39:39 +100056#include "key.h"
57#include "buffer.h"
58#include "hostfile.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000059#include "auth.h"
Damien Millerd7834352006-08-05 12:39:39 +100060#include "cipher.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000061#include "kex.h"
62#include "dh.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000063#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
64#undef TARGET_OS_MAC
Ben Lindstrom1b9f2a62004-04-08 05:11:03 +000065#include "zlib.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000066#define TARGET_OS_MAC 1
67#else
68#include "zlib.h"
69#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000070#include "packet.h"
71#include "auth-options.h"
72#include "sshpty.h"
73#include "channels.h"
74#include "session.h"
75#include "sshlogin.h"
76#include "canohost.h"
77#include "log.h"
78#include "servconf.h"
79#include "monitor.h"
80#include "monitor_mm.h"
Damien Millerd7834352006-08-05 12:39:39 +100081#ifdef GSSAPI
82#include "ssh-gss.h"
83#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000084#include "monitor_wrap.h"
85#include "monitor_fdpass.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000086#include "misc.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000087#include "compat.h"
88#include "ssh2.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000089
Darren Tucker0efd1552003-08-26 11:49:55 +100090#ifdef GSSAPI
Darren Tucker0efd1552003-08-26 11:49:55 +100091static Gssctxt *gsscontext = NULL;
92#endif
93
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000094/* Imports */
95extern ServerOptions options;
96extern u_int utmp_len;
97extern Newkeys *current_keys[];
98extern z_stream incoming_stream;
99extern z_stream outgoing_stream;
100extern u_char session_id[];
101extern Buffer input, output;
102extern Buffer auth_debug;
103extern int auth_debug_init;
Darren Tucker09991742004-07-17 17:05:14 +1000104extern Buffer loginmsg;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000105
106/* State exported from the child */
107
108struct {
109 z_stream incoming;
110 z_stream outgoing;
111 u_char *keyin;
112 u_int keyinlen;
113 u_char *keyout;
114 u_int keyoutlen;
115 u_char *ivin;
116 u_int ivinlen;
117 u_char *ivout;
118 u_int ivoutlen;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000119 u_char *ssh1key;
120 u_int ssh1keylen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000121 int ssh1cipher;
122 int ssh1protoflags;
123 u_char *input;
124 u_int ilen;
125 u_char *output;
126 u_int olen;
127} child_state;
128
Damien Miller469954d2003-06-18 20:25:33 +1000129/* Functions on the monitor that answer unprivileged requests */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000130
131int mm_answer_moduli(int, Buffer *);
132int mm_answer_sign(int, Buffer *);
133int mm_answer_pwnamallow(int, Buffer *);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000134int mm_answer_auth2_read_banner(int, Buffer *);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000135int mm_answer_authserv(int, Buffer *);
136int mm_answer_authpassword(int, Buffer *);
137int mm_answer_bsdauthquery(int, Buffer *);
138int mm_answer_bsdauthrespond(int, Buffer *);
139int mm_answer_skeyquery(int, Buffer *);
140int mm_answer_skeyrespond(int, Buffer *);
141int mm_answer_keyallowed(int, Buffer *);
142int mm_answer_keyverify(int, Buffer *);
143int mm_answer_pty(int, Buffer *);
144int mm_answer_pty_cleanup(int, Buffer *);
145int mm_answer_term(int, Buffer *);
146int mm_answer_rsa_keyallowed(int, Buffer *);
147int mm_answer_rsa_challenge(int, Buffer *);
148int mm_answer_rsa_response(int, Buffer *);
149int mm_answer_sesskey(int, Buffer *);
150int mm_answer_sessid(int, Buffer *);
151
Damien Miller79418552002-04-23 20:28:48 +1000152#ifdef USE_PAM
153int mm_answer_pam_start(int, Buffer *);
Damien Miller1f499fd2003-08-25 13:08:49 +1000154int mm_answer_pam_account(int, Buffer *);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000155int mm_answer_pam_init_ctx(int, Buffer *);
156int mm_answer_pam_query(int, Buffer *);
157int mm_answer_pam_respond(int, Buffer *);
158int mm_answer_pam_free_ctx(int, Buffer *);
Damien Miller79418552002-04-23 20:28:48 +1000159#endif
160
Darren Tucker0efd1552003-08-26 11:49:55 +1000161#ifdef GSSAPI
162int mm_answer_gss_setup_ctx(int, Buffer *);
163int mm_answer_gss_accept_ctx(int, Buffer *);
164int mm_answer_gss_userok(int, Buffer *);
Damien Miller0425d402003-11-17 22:18:21 +1100165int mm_answer_gss_checkmic(int, Buffer *);
Darren Tucker0efd1552003-08-26 11:49:55 +1000166#endif
Damien Miller25162f22002-09-12 09:47:29 +1000167
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100168#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100169int mm_answer_audit_event(int, Buffer *);
170int mm_answer_audit_command(int, Buffer *);
171#endif
172
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000173static Authctxt *authctxt;
174static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
175
176/* local state for key verify */
177static u_char *key_blob = NULL;
178static u_int key_bloblen = 0;
179static int key_blobtype = MM_NOKEY;
Damien Millera10f5612002-09-12 09:49:15 +1000180static char *hostbased_cuser = NULL;
181static char *hostbased_chost = NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000182static char *auth_method = "unknown";
Darren Tucker502d3842003-06-28 12:38:01 +1000183static u_int session_id2_len = 0;
Ben Lindstromf67e0772002-06-06 20:58:19 +0000184static u_char *session_id2 = NULL;
Damien Millerbe64d432003-05-14 19:31:12 +1000185static pid_t monitor_child_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000186
187struct mon_table {
188 enum monitor_reqtype type;
189 int flags;
190 int (*f)(int, Buffer *);
191};
192
193#define MON_ISAUTH 0x0004 /* Required for Authentication */
194#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
195#define MON_ONCE 0x0010 /* Disable after calling */
Damien Miller7a8f5b32006-03-31 23:14:23 +1100196#define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000197
198#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
199
200#define MON_PERMIT 0x1000 /* Request is permitted */
201
202struct mon_table mon_dispatch_proto20[] = {
203 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
204 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
205 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
206 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
Damien Miller5ad9fd92002-05-13 11:07:41 +1000207 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000208 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller79418552002-04-23 20:28:48 +1000209#ifdef USE_PAM
210 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000211 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000212 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
213 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
214 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
215 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Kevin Stevesbd1901b2002-04-01 18:04:35 +0000216#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100217#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100218 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100219#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000220#ifdef BSD_AUTH
221 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100222 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000223#endif
224#ifdef SKEY
225 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
226 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
227#endif
228 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
229 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
Darren Tucker0efd1552003-08-26 11:49:55 +1000230#ifdef GSSAPI
231 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
232 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
233 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
Damien Miller0425d402003-11-17 22:18:21 +1100234 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
Darren Tucker0efd1552003-08-26 11:49:55 +1000235#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000236 {0, 0, NULL}
237};
238
239struct mon_table mon_dispatch_postauth20[] = {
240 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
241 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
242 {MONITOR_REQ_PTY, 0, mm_answer_pty},
243 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
244 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100245#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100246 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
247 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
248#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000249 {0, 0, NULL}
250};
251
252struct mon_table mon_dispatch_proto15[] = {
253 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
254 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
255 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
256 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller7a8f5b32006-03-31 23:14:23 +1100257 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
258 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000259 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
260 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
261#ifdef BSD_AUTH
262 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100263 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000264#endif
265#ifdef SKEY
266 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
267 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
268#endif
Damien Millera33501b2002-05-08 12:24:42 +1000269#ifdef USE_PAM
270 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000271 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000272 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
273 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
274 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
275 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Damien Millera33501b2002-05-08 12:24:42 +1000276#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100277#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100278 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100279#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000280 {0, 0, NULL}
281};
282
283struct mon_table mon_dispatch_postauth15[] = {
284 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
285 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
286 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100287#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100288 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker5965ae12006-09-17 12:00:13 +1000289 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100290#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000291 {0, 0, NULL}
292};
293
294struct mon_table *mon_dispatch;
295
296/* Specifies if a certain message is allowed at the moment */
297
298static void
299monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
300{
301 while (ent->f != NULL) {
302 if (ent->type == type) {
303 ent->flags &= ~MON_PERMIT;
304 ent->flags |= permit ? MON_PERMIT : 0;
305 return;
306 }
307 ent++;
308 }
309}
310
311static void
312monitor_permit_authentications(int permit)
313{
314 struct mon_table *ent = mon_dispatch;
315
316 while (ent->f != NULL) {
317 if (ent->flags & MON_AUTH) {
318 ent->flags &= ~MON_PERMIT;
319 ent->flags |= permit ? MON_PERMIT : 0;
320 }
321 ent++;
322 }
323}
324
Darren Tucker3e33cec2003-10-02 16:12:36 +1000325void
326monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000327{
328 struct mon_table *ent;
329 int authenticated = 0;
330
331 debug3("preauth child monitor started");
332
Darren Tucker3e33cec2003-10-02 16:12:36 +1000333 authctxt = _authctxt;
334 memset(authctxt, 0, sizeof(*authctxt));
335
Darren Tuckerde0de392005-03-31 23:52:04 +1000336 authctxt->loginmsg = &loginmsg;
337
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000338 if (compat20) {
339 mon_dispatch = mon_dispatch_proto20;
340
341 /* Permit requests for moduli and signatures */
342 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
343 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
344 } else {
345 mon_dispatch = mon_dispatch_proto15;
346
347 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
348 }
349
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000350 /* The first few requests do not require asynchronous access */
351 while (!authenticated) {
Damien Miller7a8f5b32006-03-31 23:14:23 +1100352 auth_method = "unknown";
Darren Tuckerfbba7352006-11-07 23:16:08 +1100353 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000354 if (authenticated) {
355 if (!(ent->flags & MON_AUTHDECIDE))
356 fatal("%s: unexpected authentication from %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000357 __func__, ent->type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000358 if (authctxt->pw->pw_uid == 0 &&
359 !auth_root_allowed(auth_method))
360 authenticated = 0;
Damien Miller1f499fd2003-08-25 13:08:49 +1000361#ifdef USE_PAM
362 /* PAM needs to perform account checks after auth */
Damien Miller6aef38f2003-11-18 10:45:20 +1100363 if (options.use_pam && authenticated) {
Damien Miller1f499fd2003-08-25 13:08:49 +1000364 Buffer m;
365
366 buffer_init(&m);
Damien Millera8e06ce2003-11-21 23:48:55 +1100367 mm_request_receive_expect(pmonitor->m_sendfd,
Damien Miller1f499fd2003-08-25 13:08:49 +1000368 MONITOR_REQ_PAM_ACCOUNT, &m);
369 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
370 buffer_free(&m);
371 }
372#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000373 }
374
Damien Miller7a8f5b32006-03-31 23:14:23 +1100375 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000376 auth_log(authctxt, authenticated, auth_method,
377 compat20 ? " ssh2" : "");
378 if (!authenticated)
379 authctxt->failures++;
380 }
381 }
382
383 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000384 fatal("%s: authenticated invalid user", __func__);
Damien Miller7a8f5b32006-03-31 23:14:23 +1100385 if (strcmp(auth_method, "unknown") == 0)
386 fatal("%s: authentication method name unknown", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000387
388 debug("%s: %s has been authenticated by privileged process",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000389 __func__, authctxt->user);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000390
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000391 mm_get_keystate(pmonitor);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000392}
393
Damien Millerbe64d432003-05-14 19:31:12 +1000394static void
395monitor_set_child_handler(pid_t pid)
396{
397 monitor_child_pid = pid;
398}
399
400static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000401monitor_child_handler(int sig)
Damien Millerbe64d432003-05-14 19:31:12 +1000402{
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000403 kill(monitor_child_pid, sig);
Damien Millerbe64d432003-05-14 19:31:12 +1000404}
405
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000406void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000407monitor_child_postauth(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000408{
Damien Millerbe64d432003-05-14 19:31:12 +1000409 monitor_set_child_handler(pmonitor->m_pid);
410 signal(SIGHUP, &monitor_child_handler);
411 signal(SIGTERM, &monitor_child_handler);
Darren Tucker7fa339b2007-05-20 15:10:16 +1000412 signal(SIGINT, &monitor_child_handler);
Damien Millerbe64d432003-05-14 19:31:12 +1000413
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000414 if (compat20) {
415 mon_dispatch = mon_dispatch_postauth20;
416
417 /* Permit requests for moduli and signatures */
418 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
419 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
420 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000421 } else {
422 mon_dispatch = mon_dispatch_postauth15;
423 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
424 }
425 if (!no_pty_flag) {
426 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
427 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
428 }
429
430 for (;;)
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000431 monitor_read(pmonitor, mon_dispatch, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000432}
433
434void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000435monitor_sync(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000436{
Damien Miller2d6b8332002-06-21 15:59:49 +1000437 if (options.compression) {
438 /* The member allocation is not visible, so sync it */
439 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
440 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000441}
442
443int
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000444monitor_read(struct monitor *pmonitor, struct mon_table *ent,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000445 struct mon_table **pent)
446{
447 Buffer m;
448 int ret;
449 u_char type;
450
451 buffer_init(&m);
452
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000453 mm_request_receive(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000454 type = buffer_get_char(&m);
455
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000456 debug3("%s: checking request %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000457
458 while (ent->f != NULL) {
459 if (ent->type == type)
460 break;
461 ent++;
462 }
463
464 if (ent->f != NULL) {
465 if (!(ent->flags & MON_PERMIT))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000466 fatal("%s: unpermitted request %d", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000467 type);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000468 ret = (*ent->f)(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000469 buffer_free(&m);
470
471 /* The child may use this request only once, disable it */
472 if (ent->flags & MON_ONCE) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000473 debug2("%s: %d used once, disabling now", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000474 type);
475 ent->flags &= ~MON_PERMIT;
476 }
477
478 if (pent != NULL)
479 *pent = ent;
480
481 return ret;
482 }
483
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000484 fatal("%s: unsupported request: %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000485
486 /* NOTREACHED */
487 return (-1);
488}
489
490/* allowed key state */
491static int
492monitor_allowed_key(u_char *blob, u_int bloblen)
493{
494 /* make sure key is allowed */
495 if (key_blob == NULL || key_bloblen != bloblen ||
496 memcmp(key_blob, blob, key_bloblen))
497 return (0);
498 return (1);
499}
500
501static void
502monitor_reset_key_state(void)
503{
504 /* reset state */
505 if (key_blob != NULL)
506 xfree(key_blob);
507 if (hostbased_cuser != NULL)
508 xfree(hostbased_cuser);
509 if (hostbased_chost != NULL)
510 xfree(hostbased_chost);
511 key_blob = NULL;
512 key_bloblen = 0;
513 key_blobtype = MM_NOKEY;
514 hostbased_cuser = NULL;
515 hostbased_chost = NULL;
516}
517
518int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000519mm_answer_moduli(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000520{
521 DH *dh;
522 int min, want, max;
523
524 min = buffer_get_int(m);
525 want = buffer_get_int(m);
526 max = buffer_get_int(m);
527
528 debug3("%s: got parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000529 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000530 /* We need to check here, too, in case the child got corrupted */
531 if (max < min || want < min || max < want)
532 fatal("%s: bad parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000533 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000534
535 buffer_clear(m);
536
537 dh = choose_dh(min, want, max);
538 if (dh == NULL) {
539 buffer_put_char(m, 0);
540 return (0);
541 } else {
542 /* Send first bignum */
543 buffer_put_char(m, 1);
544 buffer_put_bignum2(m, dh->p);
545 buffer_put_bignum2(m, dh->g);
546
547 DH_free(dh);
548 }
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000549 mm_request_send(sock, MONITOR_ANS_MODULI, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000550 return (0);
551}
552
553int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000554mm_answer_sign(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000555{
556 Key *key;
557 u_char *p;
558 u_char *signature;
559 u_int siglen, datlen;
560 int keyid;
561
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000562 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000563
564 keyid = buffer_get_int(m);
565 p = buffer_get_string(m, &datlen);
566
Damien Millera63128d2006-03-15 12:08:28 +1100567 /*
Damien Millerc91e5562006-03-26 13:58:55 +1100568 * Supported KEX types will only return SHA1 (20 byte) or
Damien Millera63128d2006-03-15 12:08:28 +1100569 * SHA256 (32 byte) hashes
570 */
571 if (datlen != 20 && datlen != 32)
Ben Lindstromd5502182002-06-27 00:12:57 +0000572 fatal("%s: data length incorrect: %u", __func__, datlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000573
Ben Lindstromf67e0772002-06-06 20:58:19 +0000574 /* save session id, it will be passed on the first call */
575 if (session_id2_len == 0) {
576 session_id2_len = datlen;
577 session_id2 = xmalloc(session_id2_len);
578 memcpy(session_id2, p, session_id2_len);
579 }
580
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000581 if ((key = get_hostkey_by_index(keyid)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000582 fatal("%s: no hostkey from index %d", __func__, keyid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000583 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000584 fatal("%s: key_sign failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000585
Ben Lindstromd5502182002-06-27 00:12:57 +0000586 debug3("%s: signature %p(%u)", __func__, signature, siglen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000587
588 buffer_clear(m);
589 buffer_put_string(m, signature, siglen);
590
591 xfree(p);
592 xfree(signature);
593
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000594 mm_request_send(sock, MONITOR_ANS_SIGN, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000595
596 /* Turn on permissions for getpwnam */
597 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
598
599 return (0);
600}
601
602/* Retrieves the password entry and also checks if the user is permitted */
603
604int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000605mm_answer_pwnamallow(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000606{
Darren Tuckerb09b6772004-06-22 15:06:46 +1000607 char *username;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000608 struct passwd *pwent;
609 int allowed = 0;
610
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000611 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000612
613 if (authctxt->attempt++ != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000614 fatal("%s: multiple attempts for getpwnam", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000615
Darren Tuckerb09b6772004-06-22 15:06:46 +1000616 username = buffer_get_string(m, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000617
Darren Tuckerb09b6772004-06-22 15:06:46 +1000618 pwent = getpwnamallow(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000619
Darren Tuckerb09b6772004-06-22 15:06:46 +1000620 authctxt->user = xstrdup(username);
621 setproctitle("%s [priv]", pwent ? username : "unknown");
622 xfree(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000623
624 buffer_clear(m);
625
626 if (pwent == NULL) {
627 buffer_put_char(m, 0);
Damien Millerf96d1832003-11-18 22:01:48 +1100628 authctxt->pw = fakepw();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000629 goto out;
630 }
631
632 allowed = 1;
633 authctxt->pw = pwent;
634 authctxt->valid = 1;
635
636 buffer_put_char(m, 1);
637 buffer_put_string(m, pwent, sizeof(struct passwd));
638 buffer_put_cstring(m, pwent->pw_name);
639 buffer_put_cstring(m, "*");
640 buffer_put_cstring(m, pwent->pw_gecos);
Kevin Steves7e147602002-03-22 18:07:17 +0000641#ifdef HAVE_PW_CLASS_IN_PASSWD
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000642 buffer_put_cstring(m, pwent->pw_class);
Kevin Steves7e147602002-03-22 18:07:17 +0000643#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000644 buffer_put_cstring(m, pwent->pw_dir);
645 buffer_put_cstring(m, pwent->pw_shell);
Darren Tucker2f8b3d92007-12-02 23:02:15 +1100646
647 out:
Darren Tucker1629c072007-02-19 22:25:37 +1100648 buffer_put_string(m, &options, sizeof(options));
649 if (options.banner != NULL)
650 buffer_put_cstring(m, options.banner);
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000651 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000652 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000653
654 /* For SSHv1 allow authentication now */
655 if (!compat20)
656 monitor_permit_authentications(1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000657 else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000658 /* Allow service/style information on the auth context */
659 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000660 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
661 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000662
Damien Millera33501b2002-05-08 12:24:42 +1000663#ifdef USE_PAM
Damien Miller4e448a32003-05-14 15:11:48 +1000664 if (options.use_pam)
665 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
Damien Millera33501b2002-05-08 12:24:42 +1000666#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000667
668 return (0);
669}
670
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000671int mm_answer_auth2_read_banner(int sock, Buffer *m)
Damien Miller5ad9fd92002-05-13 11:07:41 +1000672{
673 char *banner;
674
675 buffer_clear(m);
676 banner = auth2_read_banner();
677 buffer_put_cstring(m, banner != NULL ? banner : "");
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000678 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000679
680 if (banner != NULL)
Ben Lindstromeec16fc2002-07-04 00:06:15 +0000681 xfree(banner);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000682
683 return (0);
684}
685
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000686int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000687mm_answer_authserv(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000688{
689 monitor_permit_authentications(1);
690
691 authctxt->service = buffer_get_string(m, NULL);
692 authctxt->style = buffer_get_string(m, NULL);
693 debug3("%s: service=%s, style=%s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000694 __func__, authctxt->service, authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000695
696 if (strlen(authctxt->style) == 0) {
697 xfree(authctxt->style);
698 authctxt->style = NULL;
699 }
700
701 return (0);
702}
703
704int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000705mm_answer_authpassword(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000706{
707 static int call_count;
708 char *passwd;
Ben Lindstrom7cea16b2002-07-23 21:13:40 +0000709 int authenticated;
710 u_int plen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000711
712 passwd = buffer_get_string(m, &plen);
713 /* Only authenticate if the context is valid */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000714 authenticated = options.password_authentication &&
Damien Miller856f0be2003-09-03 07:32:45 +1000715 auth_password(authctxt, passwd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000716 memset(passwd, 0, strlen(passwd));
717 xfree(passwd);
718
719 buffer_clear(m);
720 buffer_put_int(m, authenticated);
721
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000722 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000723 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000724
725 call_count++;
726 if (plen == 0 && call_count == 1)
727 auth_method = "none";
728 else
729 auth_method = "password";
730
731 /* Causes monitor loop to terminate if authenticated */
732 return (authenticated);
733}
734
735#ifdef BSD_AUTH
736int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000737mm_answer_bsdauthquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000738{
739 char *name, *infotxt;
740 u_int numprompts;
741 u_int *echo_on;
742 char **prompts;
Damien Millerb7df3af2003-02-24 11:55:46 +1100743 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000744
Damien Millerb7df3af2003-02-24 11:55:46 +1100745 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
746 &prompts, &echo_on) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000747
748 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100749 buffer_put_int(m, success);
750 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000751 buffer_put_cstring(m, prompts[0]);
752
Damien Millerb7df3af2003-02-24 11:55:46 +1100753 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000754 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000755
Damien Millerb7df3af2003-02-24 11:55:46 +1100756 if (success) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000757 xfree(name);
758 xfree(infotxt);
759 xfree(prompts);
760 xfree(echo_on);
761 }
762
763 return (0);
764}
765
766int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000767mm_answer_bsdauthrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000768{
769 char *response;
770 int authok;
771
772 if (authctxt->as == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000773 fatal("%s: no bsd auth session", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000774
775 response = buffer_get_string(m, NULL);
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000776 authok = options.challenge_response_authentication &&
777 auth_userresponse(authctxt->as, response, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000778 authctxt->as = NULL;
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000779 debug3("%s: <%s> = <%d>", __func__, response, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000780 xfree(response);
781
782 buffer_clear(m);
783 buffer_put_int(m, authok);
784
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000785 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000786 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000787
788 auth_method = "bsdauth";
789
790 return (authok != 0);
791}
792#endif
793
794#ifdef SKEY
795int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000796mm_answer_skeyquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000797{
798 struct skey skey;
799 char challenge[1024];
Damien Millerb7df3af2003-02-24 11:55:46 +1100800 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000801
Darren Tucker06a8cfe2004-04-14 17:24:30 +1000802 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
803 sizeof(challenge)) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000804
805 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100806 buffer_put_int(m, success);
807 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000808 buffer_put_cstring(m, challenge);
809
Damien Millerb7df3af2003-02-24 11:55:46 +1100810 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000811 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000812
813 return (0);
814}
815
816int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000817mm_answer_skeyrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000818{
819 char *response;
820 int authok;
821
822 response = buffer_get_string(m, NULL);
823
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000824 authok = (options.challenge_response_authentication &&
825 authctxt->valid &&
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000826 skey_haskey(authctxt->pw->pw_name) == 0 &&
827 skey_passcheck(authctxt->pw->pw_name, response) != -1);
828
829 xfree(response);
830
831 buffer_clear(m);
832 buffer_put_int(m, authok);
833
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000834 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000835 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000836
837 auth_method = "skey";
838
839 return (authok != 0);
840}
841#endif
842
Damien Miller79418552002-04-23 20:28:48 +1000843#ifdef USE_PAM
844int
Darren Tucker7eda5922004-06-22 13:22:50 +1000845mm_answer_pam_start(int sock, Buffer *m)
Damien Miller79418552002-04-23 20:28:48 +1000846{
Damien Miller4e448a32003-05-14 15:11:48 +1000847 if (!options.use_pam)
848 fatal("UsePAM not set, but ended up in %s anyway", __func__);
849
Darren Tuckerdbf7a742004-03-08 23:04:06 +1100850 start_pam(authctxt);
Damien Miller79418552002-04-23 20:28:48 +1000851
Damien Miller1f499fd2003-08-25 13:08:49 +1000852 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
853
Damien Miller79418552002-04-23 20:28:48 +1000854 return (0);
855}
Damien Miller4f9f42a2003-05-10 19:28:02 +1000856
Damien Miller1f499fd2003-08-25 13:08:49 +1000857int
Darren Tucker7eda5922004-06-22 13:22:50 +1000858mm_answer_pam_account(int sock, Buffer *m)
Damien Miller1f499fd2003-08-25 13:08:49 +1000859{
860 u_int ret;
Damien Miller787b2ec2003-11-21 23:56:47 +1100861
Damien Miller1f499fd2003-08-25 13:08:49 +1000862 if (!options.use_pam)
863 fatal("UsePAM not set, but ended up in %s anyway", __func__);
864
865 ret = do_pam_account();
866
867 buffer_put_int(m, ret);
Darren Tuckerd4f04ae2005-09-30 10:23:21 +1000868 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
Damien Miller1f499fd2003-08-25 13:08:49 +1000869
Darren Tucker7eda5922004-06-22 13:22:50 +1000870 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
Damien Miller1f499fd2003-08-25 13:08:49 +1000871
872 return (ret);
873}
874
Damien Miller4f9f42a2003-05-10 19:28:02 +1000875static void *sshpam_ctxt, *sshpam_authok;
876extern KbdintDevice sshpam_device;
877
878int
Darren Tucker7eda5922004-06-22 13:22:50 +1000879mm_answer_pam_init_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000880{
881
882 debug3("%s", __func__);
883 authctxt->user = buffer_get_string(m, NULL);
884 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
885 sshpam_authok = NULL;
886 buffer_clear(m);
887 if (sshpam_ctxt != NULL) {
888 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
889 buffer_put_int(m, 1);
890 } else {
891 buffer_put_int(m, 0);
892 }
Darren Tucker7eda5922004-06-22 13:22:50 +1000893 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000894 return (0);
895}
896
897int
Darren Tucker7eda5922004-06-22 13:22:50 +1000898mm_answer_pam_query(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000899{
900 char *name, *info, **prompts;
Damien Miller04b65332005-07-17 17:53:31 +1000901 u_int i, num, *echo_on;
902 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000903
904 debug3("%s", __func__);
905 sshpam_authok = NULL;
906 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
907 if (ret == 0 && num == 0)
908 sshpam_authok = sshpam_ctxt;
909 if (num > 1 || name == NULL || info == NULL)
910 ret = -1;
911 buffer_clear(m);
912 buffer_put_int(m, ret);
913 buffer_put_cstring(m, name);
914 xfree(name);
915 buffer_put_cstring(m, info);
916 xfree(info);
917 buffer_put_int(m, num);
918 for (i = 0; i < num; ++i) {
919 buffer_put_cstring(m, prompts[i]);
920 xfree(prompts[i]);
921 buffer_put_int(m, echo_on[i]);
922 }
923 if (prompts != NULL)
924 xfree(prompts);
925 if (echo_on != NULL)
926 xfree(echo_on);
Darren Tuckerf14b2aa2006-05-21 18:26:40 +1000927 auth_method = "keyboard-interactive/pam";
Darren Tucker7eda5922004-06-22 13:22:50 +1000928 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000929 return (0);
930}
931
932int
Darren Tucker7eda5922004-06-22 13:22:50 +1000933mm_answer_pam_respond(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000934{
935 char **resp;
Damien Miller04b65332005-07-17 17:53:31 +1000936 u_int i, num;
937 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000938
939 debug3("%s", __func__);
940 sshpam_authok = NULL;
941 num = buffer_get_int(m);
942 if (num > 0) {
Darren Tuckerd8093e42006-05-04 16:24:34 +1000943 resp = xcalloc(num, sizeof(char *));
Damien Miller4f9f42a2003-05-10 19:28:02 +1000944 for (i = 0; i < num; ++i)
945 resp[i] = buffer_get_string(m, NULL);
946 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
947 for (i = 0; i < num; ++i)
948 xfree(resp[i]);
949 xfree(resp);
950 } else {
951 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
952 }
953 buffer_clear(m);
954 buffer_put_int(m, ret);
Darren Tucker7eda5922004-06-22 13:22:50 +1000955 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000956 auth_method = "keyboard-interactive/pam";
957 if (ret == 0)
958 sshpam_authok = sshpam_ctxt;
959 return (0);
960}
961
962int
Darren Tucker7eda5922004-06-22 13:22:50 +1000963mm_answer_pam_free_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000964{
965
966 debug3("%s", __func__);
967 (sshpam_device.free_ctx)(sshpam_ctxt);
968 buffer_clear(m);
Darren Tucker7eda5922004-06-22 13:22:50 +1000969 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
Darren Tuckerf14b2aa2006-05-21 18:26:40 +1000970 auth_method = "keyboard-interactive/pam";
Damien Miller4f9f42a2003-05-10 19:28:02 +1000971 return (sshpam_authok == sshpam_ctxt);
972}
Damien Miller79418552002-04-23 20:28:48 +1000973#endif
974
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000975static void
976mm_append_debug(Buffer *m)
977{
978 if (auth_debug_init && buffer_len(&auth_debug)) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000979 debug3("%s: Appending debug messages for child", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000980 buffer_append(m, buffer_ptr(&auth_debug),
981 buffer_len(&auth_debug));
982 buffer_clear(&auth_debug);
983 }
984}
985
986int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000987mm_answer_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000988{
989 Key *key;
Damien Millera10f5612002-09-12 09:49:15 +1000990 char *cuser, *chost;
991 u_char *blob;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000992 u_int bloblen;
993 enum mm_keytype type = 0;
994 int allowed = 0;
995
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000996 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000997
998 type = buffer_get_int(m);
999 cuser = buffer_get_string(m, NULL);
1000 chost = buffer_get_string(m, NULL);
1001 blob = buffer_get_string(m, &bloblen);
1002
1003 key = key_from_blob(blob, bloblen);
1004
1005 if ((compat20 && type == MM_RSAHOSTKEY) ||
1006 (!compat20 && type != MM_RSAHOSTKEY))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001007 fatal("%s: key type and protocol mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001008
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001009 debug3("%s: key_from_blob: %p", __func__, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001010
Damien Miller3e3b5142003-11-17 21:13:40 +11001011 if (key != NULL && authctxt->valid) {
Darren Tucker47eede72005-03-14 23:08:12 +11001012 switch (type) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001013 case MM_USERKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001014 allowed = options.pubkey_authentication &&
1015 user_key_allowed(authctxt->pw, key);
Damien Miller7a8f5b32006-03-31 23:14:23 +11001016 auth_method = "publickey";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001017 break;
1018 case MM_HOSTKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001019 allowed = options.hostbased_authentication &&
1020 hostbased_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001021 cuser, chost, key);
Damien Miller7a8f5b32006-03-31 23:14:23 +11001022 auth_method = "hostbased";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001023 break;
1024 case MM_RSAHOSTKEY:
1025 key->type = KEY_RSA1; /* XXX */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001026 allowed = options.rhosts_rsa_authentication &&
1027 auth_rhosts_rsa_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001028 cuser, chost, key);
Damien Miller7a8f5b32006-03-31 23:14:23 +11001029 auth_method = "rsa";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001030 break;
1031 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001032 fatal("%s: unknown key type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001033 break;
1034 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001035 }
Damien Miller00111382003-03-10 11:21:17 +11001036 if (key != NULL)
1037 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001038
1039 /* clear temporarily storage (used by verify) */
1040 monitor_reset_key_state();
1041
1042 if (allowed) {
1043 /* Save temporarily for comparison in verify */
1044 key_blob = blob;
1045 key_bloblen = bloblen;
1046 key_blobtype = type;
1047 hostbased_cuser = cuser;
1048 hostbased_chost = chost;
Damien Miller96937bd2006-03-26 14:01:54 +11001049 } else {
Damien Miller7a8f5b32006-03-31 23:14:23 +11001050 /* Log failed attempt */
1051 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
Damien Miller96937bd2006-03-26 14:01:54 +11001052 xfree(blob);
1053 xfree(cuser);
1054 xfree(chost);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001055 }
1056
1057 debug3("%s: key %p is %s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001058 __func__, key, allowed ? "allowed" : "disallowed");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001059
1060 buffer_clear(m);
1061 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001062 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001063
1064 mm_append_debug(m);
1065
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001066 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001067
1068 if (type == MM_RSAHOSTKEY)
1069 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1070
1071 return (0);
1072}
1073
1074static int
1075monitor_valid_userblob(u_char *data, u_int datalen)
1076{
1077 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001078 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001079 u_int len;
1080 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001081
1082 buffer_init(&b);
1083 buffer_append(&b, data, datalen);
1084
1085 if (datafellows & SSH_OLD_SESSIONID) {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001086 p = buffer_ptr(&b);
1087 len = buffer_len(&b);
1088 if ((session_id2 == NULL) ||
1089 (len < session_id2_len) ||
1090 (memcmp(p, session_id2, session_id2_len) != 0))
1091 fail++;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001092 buffer_consume(&b, session_id2_len);
1093 } else {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001094 p = buffer_get_string(&b, &len);
1095 if ((session_id2 == NULL) ||
1096 (len != session_id2_len) ||
1097 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001098 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001099 xfree(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001100 }
1101 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1102 fail++;
1103 p = buffer_get_string(&b, NULL);
1104 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001105 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001106 authctxt->user, p);
1107 fail++;
1108 }
1109 xfree(p);
1110 buffer_skip_string(&b);
1111 if (datafellows & SSH_BUG_PKAUTH) {
1112 if (!buffer_get_char(&b))
1113 fail++;
1114 } else {
1115 p = buffer_get_string(&b, NULL);
1116 if (strcmp("publickey", p) != 0)
1117 fail++;
1118 xfree(p);
1119 if (!buffer_get_char(&b))
1120 fail++;
1121 buffer_skip_string(&b);
1122 }
1123 buffer_skip_string(&b);
1124 if (buffer_len(&b) != 0)
1125 fail++;
1126 buffer_free(&b);
1127 return (fail == 0);
1128}
1129
1130static int
Damien Millera10f5612002-09-12 09:49:15 +10001131monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1132 char *chost)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001133{
1134 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001135 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001136 u_int len;
1137 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001138
1139 buffer_init(&b);
1140 buffer_append(&b, data, datalen);
1141
Ben Lindstromf67e0772002-06-06 20:58:19 +00001142 p = buffer_get_string(&b, &len);
1143 if ((session_id2 == NULL) ||
1144 (len != session_id2_len) ||
1145 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001146 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001147 xfree(p);
1148
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001149 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1150 fail++;
1151 p = buffer_get_string(&b, NULL);
1152 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001153 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001154 authctxt->user, p);
1155 fail++;
1156 }
1157 xfree(p);
1158 buffer_skip_string(&b); /* service */
1159 p = buffer_get_string(&b, NULL);
1160 if (strcmp(p, "hostbased") != 0)
1161 fail++;
1162 xfree(p);
1163 buffer_skip_string(&b); /* pkalg */
1164 buffer_skip_string(&b); /* pkblob */
1165
1166 /* verify client host, strip trailing dot if necessary */
1167 p = buffer_get_string(&b, NULL);
1168 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1169 p[len - 1] = '\0';
1170 if (strcmp(p, chost) != 0)
1171 fail++;
1172 xfree(p);
1173
1174 /* verify client user */
1175 p = buffer_get_string(&b, NULL);
1176 if (strcmp(p, cuser) != 0)
1177 fail++;
1178 xfree(p);
1179
1180 if (buffer_len(&b) != 0)
1181 fail++;
1182 buffer_free(&b);
1183 return (fail == 0);
1184}
1185
1186int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001187mm_answer_keyverify(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001188{
1189 Key *key;
1190 u_char *signature, *data, *blob;
1191 u_int signaturelen, datalen, bloblen;
1192 int verified = 0;
1193 int valid_data = 0;
1194
1195 blob = buffer_get_string(m, &bloblen);
1196 signature = buffer_get_string(m, &signaturelen);
1197 data = buffer_get_string(m, &datalen);
1198
1199 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
Ben Lindstromb57a4bf2002-03-27 18:00:59 +00001200 !monitor_allowed_key(blob, bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001201 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001202
1203 key = key_from_blob(blob, bloblen);
1204 if (key == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001205 fatal("%s: bad public key blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001206
1207 switch (key_blobtype) {
1208 case MM_USERKEY:
1209 valid_data = monitor_valid_userblob(data, datalen);
1210 break;
1211 case MM_HOSTKEY:
1212 valid_data = monitor_valid_hostbasedblob(data, datalen,
1213 hostbased_cuser, hostbased_chost);
1214 break;
1215 default:
1216 valid_data = 0;
1217 break;
1218 }
1219 if (!valid_data)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001220 fatal("%s: bad signature data blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001221
1222 verified = key_verify(key, signature, signaturelen, data, datalen);
1223 debug3("%s: key %p signature %s",
Darren Tuckerfbba7352006-11-07 23:16:08 +11001224 __func__, key, (verified == 1) ? "verified" : "unverified");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001225
1226 key_free(key);
1227 xfree(blob);
1228 xfree(signature);
1229 xfree(data);
1230
Ben Lindstrome1c09122002-06-23 00:38:24 +00001231 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1232
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001233 monitor_reset_key_state();
1234
1235 buffer_clear(m);
1236 buffer_put_int(m, verified);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001237 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001238
Darren Tuckerfbba7352006-11-07 23:16:08 +11001239 return (verified == 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001240}
1241
1242static void
1243mm_record_login(Session *s, struct passwd *pw)
1244{
1245 socklen_t fromlen;
1246 struct sockaddr_storage from;
1247
1248 /*
1249 * Get IP address of client. If the connection is not a socket, let
1250 * the address be 0.0.0.0.
1251 */
1252 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +10001253 fromlen = sizeof(from);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001254 if (packet_connection_is_on_socket()) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001255 if (getpeername(packet_get_connection_in(),
Damien Miller9f3bd532006-03-26 14:07:52 +11001256 (struct sockaddr *)&from, &fromlen) < 0) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001257 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +10001258 cleanup_exit(255);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001259 }
1260 }
1261 /* Record that there was a login on that tty from the remote host. */
1262 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
Damien Miller3a961dc2003-06-03 10:25:48 +10001263 get_remote_name_or_ip(utmp_len, options.use_dns),
Damien Millerebc23062002-09-04 16:45:09 +10001264 (struct sockaddr *)&from, fromlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001265}
1266
1267static void
1268mm_session_close(Session *s)
1269{
Damien Miller04bd8b02003-05-25 14:38:33 +10001270 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001271 if (s->ttyfd != -1) {
Damien Miller9ab00b42006-08-05 12:40:11 +10001272 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001273 session_pty_cleanup2(s);
1274 }
1275 s->used = 0;
1276}
1277
1278int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001279mm_answer_pty(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001280{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001281 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001282 Session *s;
1283 int res, fd0;
1284
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001285 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001286
1287 buffer_clear(m);
1288 s = session_new();
1289 if (s == NULL)
1290 goto error;
1291 s->authctxt = authctxt;
1292 s->pw = authctxt->pw;
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001293 s->pid = pmonitor->m_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001294 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1295 if (res == 0)
1296 goto error;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001297 pty_setowner(authctxt->pw, s->tty);
1298
1299 buffer_put_int(m, 1);
1300 buffer_put_cstring(m, s->tty);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001301
1302 /* We need to trick ttyslot */
1303 if (dup2(s->ttyfd, 0) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001304 fatal("%s: dup2", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001305
1306 mm_record_login(s, authctxt->pw);
1307
1308 /* Now we can close the file descriptor again */
1309 close(0);
1310
Darren Tucker09991742004-07-17 17:05:14 +10001311 /* send messages generated by record_login */
1312 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1313 buffer_clear(&loginmsg);
1314
1315 mm_request_send(sock, MONITOR_ANS_PTY, m);
1316
Damien Miller54fd7cf2007-09-17 12:04:08 +10001317 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1318 mm_send_fd(sock, s->ttyfd) == -1)
1319 fatal("%s: send fds failed", __func__);
Darren Tucker09991742004-07-17 17:05:14 +10001320
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001321 /* make sure nothing uses fd 0 */
1322 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001323 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001324 if (fd0 != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001325 error("%s: fd0 %d != 0", __func__, fd0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001326
1327 /* slave is not needed */
1328 close(s->ttyfd);
1329 s->ttyfd = s->ptyfd;
1330 /* no need to dup() because nobody closes ptyfd */
1331 s->ptymaster = s->ptyfd;
1332
Damien Miller9ab00b42006-08-05 12:40:11 +10001333 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001334
1335 return (0);
1336
1337 error:
1338 if (s != NULL)
1339 mm_session_close(s);
1340 buffer_put_int(m, 0);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001341 mm_request_send(sock, MONITOR_ANS_PTY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001342 return (0);
1343}
1344
1345int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001346mm_answer_pty_cleanup(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001347{
1348 Session *s;
1349 char *tty;
1350
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001351 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001352
1353 tty = buffer_get_string(m, NULL);
1354 if ((s = session_by_tty(tty)) != NULL)
1355 mm_session_close(s);
1356 buffer_clear(m);
1357 xfree(tty);
1358 return (0);
1359}
1360
1361int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001362mm_answer_sesskey(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001363{
1364 BIGNUM *p;
1365 int rsafail;
1366
1367 /* Turn off permissions */
Darren Tucker5b530262005-02-09 09:52:17 +11001368 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001369
1370 if ((p = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001371 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001372
1373 buffer_get_bignum2(m, p);
1374
1375 rsafail = ssh1_session_key(p);
1376
1377 buffer_clear(m);
1378 buffer_put_int(m, rsafail);
1379 buffer_put_bignum2(m, p);
1380
1381 BN_clear_free(p);
1382
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001383 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001384
1385 /* Turn on permissions for sessid passing */
1386 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1387
1388 return (0);
1389}
1390
1391int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001392mm_answer_sessid(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001393{
1394 int i;
1395
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001396 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001397
1398 if (buffer_len(m) != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001399 fatal("%s: bad ssh1 session id", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001400 for (i = 0; i < 16; i++)
1401 session_id[i] = buffer_get_char(m);
1402
1403 /* Turn on permissions for getpwnam */
1404 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1405
1406 return (0);
1407}
1408
1409int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001410mm_answer_rsa_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001411{
1412 BIGNUM *client_n;
1413 Key *key = NULL;
1414 u_char *blob = NULL;
1415 u_int blen = 0;
1416 int allowed = 0;
1417
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001418 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001419
Damien Miller7a8f5b32006-03-31 23:14:23 +11001420 auth_method = "rsa";
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001421 if (options.rsa_authentication && authctxt->valid) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001422 if ((client_n = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001423 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001424 buffer_get_bignum2(m, client_n);
1425 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1426 BN_clear_free(client_n);
1427 }
1428 buffer_clear(m);
1429 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001430 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001431
1432 /* clear temporarily storage (used by generate challenge) */
1433 monitor_reset_key_state();
1434
1435 if (allowed && key != NULL) {
1436 key->type = KEY_RSA; /* cheat for key_to_blob */
1437 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001438 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001439 buffer_put_string(m, blob, blen);
1440
1441 /* Save temporarily for comparison in verify */
1442 key_blob = blob;
1443 key_bloblen = blen;
1444 key_blobtype = MM_RSAUSERKEY;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001445 }
Damien Miller00111382003-03-10 11:21:17 +11001446 if (key != NULL)
1447 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001448
1449 mm_append_debug(m);
1450
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001451 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001452
1453 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1454 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1455 return (0);
1456}
1457
1458int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001459mm_answer_rsa_challenge(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001460{
1461 Key *key = NULL;
1462 u_char *blob;
1463 u_int blen;
1464
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001465 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001466
1467 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001468 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001469 blob = buffer_get_string(m, &blen);
1470 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001471 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001472 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001473 fatal("%s: key type mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001474 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001475 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001476
1477 if (ssh1_challenge)
1478 BN_clear_free(ssh1_challenge);
1479 ssh1_challenge = auth_rsa_generate_challenge(key);
1480
1481 buffer_clear(m);
1482 buffer_put_bignum2(m, ssh1_challenge);
1483
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001484 debug3("%s sending reply", __func__);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001485 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001486
1487 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
Damien Miller00111382003-03-10 11:21:17 +11001488
1489 xfree(blob);
1490 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001491 return (0);
1492}
1493
1494int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001495mm_answer_rsa_response(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001496{
1497 Key *key = NULL;
1498 u_char *blob, *response;
1499 u_int blen, len;
1500 int success;
1501
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001502 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001503
1504 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001505 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001506 if (ssh1_challenge == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001507 fatal("%s: no ssh1_challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001508
1509 blob = buffer_get_string(m, &blen);
1510 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001511 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001512 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001513 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001514 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001515 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001516 response = buffer_get_string(m, &len);
1517 if (len != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001518 fatal("%s: received bad response to challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001519 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1520
Damien Miller00111382003-03-10 11:21:17 +11001521 xfree(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001522 key_free(key);
1523 xfree(response);
1524
1525 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1526
1527 /* reset state */
1528 BN_clear_free(ssh1_challenge);
1529 ssh1_challenge = NULL;
1530 monitor_reset_key_state();
1531
1532 buffer_clear(m);
1533 buffer_put_int(m, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001534 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001535
1536 return (success);
1537}
1538
1539int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001540mm_answer_term(int sock, Buffer *req)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001541{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001542 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001543 int res, status;
1544
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001545 debug3("%s: tearing down sessions", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001546
1547 /* The child is terminating */
1548 session_destroy_all(&mm_session_close);
1549
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001550 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
Ben Lindstrom47fd8112002-04-02 20:48:19 +00001551 if (errno != EINTR)
1552 exit(1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001553
1554 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1555
1556 /* Terminate process */
Darren Tucker1f8311c2004-05-13 16:39:33 +10001557 exit(res);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001558}
1559
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001560#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +11001561/* Report that an audit event occurred */
1562int
1563mm_answer_audit_event(int socket, Buffer *m)
1564{
1565 ssh_audit_event_t event;
1566
1567 debug3("%s entering", __func__);
1568
1569 event = buffer_get_int(m);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001570 switch(event) {
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001571 case SSH_AUTH_FAIL_PUBKEY:
1572 case SSH_AUTH_FAIL_HOSTBASED:
1573 case SSH_AUTH_FAIL_GSSAPI:
1574 case SSH_LOGIN_EXCEED_MAXTRIES:
1575 case SSH_LOGIN_ROOT_DENIED:
1576 case SSH_CONNECTION_CLOSE:
1577 case SSH_INVALID_USER:
Darren Tucker269a1ea2005-02-03 00:20:53 +11001578 audit_event(event);
1579 break;
1580 default:
1581 fatal("Audit event type %d not permitted", event);
1582 }
1583
1584 return (0);
1585}
1586
1587int
1588mm_answer_audit_command(int socket, Buffer *m)
1589{
1590 u_int len;
1591 char *cmd;
1592
1593 debug3("%s entering", __func__);
1594 cmd = buffer_get_string(m, &len);
1595 /* sanity check command, if so how? */
1596 audit_run_command(cmd);
1597 xfree(cmd);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001598 return (0);
1599}
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001600#endif /* SSH_AUDIT_EVENTS */
Darren Tucker269a1ea2005-02-03 00:20:53 +11001601
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001602void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001603monitor_apply_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001604{
1605 if (compat20) {
1606 set_newkeys(MODE_IN);
1607 set_newkeys(MODE_OUT);
1608 } else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001609 packet_set_protocol_flags(child_state.ssh1protoflags);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001610 packet_set_encryption_key(child_state.ssh1key,
1611 child_state.ssh1keylen, child_state.ssh1cipher);
1612 xfree(child_state.ssh1key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001613 }
1614
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001615 /* for rc4 and other stateful ciphers */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001616 packet_set_keycontext(MODE_OUT, child_state.keyout);
1617 xfree(child_state.keyout);
1618 packet_set_keycontext(MODE_IN, child_state.keyin);
1619 xfree(child_state.keyin);
1620
1621 if (!compat20) {
1622 packet_set_iv(MODE_OUT, child_state.ivout);
1623 xfree(child_state.ivout);
1624 packet_set_iv(MODE_IN, child_state.ivin);
1625 xfree(child_state.ivin);
1626 }
1627
1628 memcpy(&incoming_stream, &child_state.incoming,
1629 sizeof(incoming_stream));
1630 memcpy(&outgoing_stream, &child_state.outgoing,
1631 sizeof(outgoing_stream));
1632
1633 /* Update with new address */
Damien Miller2d6b8332002-06-21 15:59:49 +10001634 if (options.compression)
1635 mm_init_compression(pmonitor->m_zlib);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001636
1637 /* Network I/O buffers */
1638 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1639 buffer_clear(&input);
1640 buffer_append(&input, child_state.input, child_state.ilen);
1641 memset(child_state.input, 0, child_state.ilen);
1642 xfree(child_state.input);
1643
1644 buffer_clear(&output);
1645 buffer_append(&output, child_state.output, child_state.olen);
1646 memset(child_state.output, 0, child_state.olen);
1647 xfree(child_state.output);
1648}
1649
1650static Kex *
1651mm_get_kex(Buffer *m)
1652{
1653 Kex *kex;
1654 void *blob;
1655 u_int bloblen;
1656
Damien Miller07d86be2006-03-26 14:19:21 +11001657 kex = xcalloc(1, sizeof(*kex));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001658 kex->session_id = buffer_get_string(m, &kex->session_id_len);
Ben Lindstromf67e0772002-06-06 20:58:19 +00001659 if ((session_id2 == NULL) ||
1660 (kex->session_id_len != session_id2_len) ||
1661 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1662 fatal("mm_get_get: internal error: bad session id");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001663 kex->we_need = buffer_get_int(m);
Damien Millerb062c292003-03-24 09:12:09 +11001664 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
Damien Millerf675fc42004-06-15 10:30:09 +10001665 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
Damien Millerb062c292003-03-24 09:12:09 +11001666 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
Damien Millera63128d2006-03-15 12:08:28 +11001667 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001668 kex->server = 1;
1669 kex->hostkey_type = buffer_get_int(m);
1670 kex->kex_type = buffer_get_int(m);
1671 blob = buffer_get_string(m, &bloblen);
1672 buffer_init(&kex->my);
1673 buffer_append(&kex->my, blob, bloblen);
1674 xfree(blob);
1675 blob = buffer_get_string(m, &bloblen);
1676 buffer_init(&kex->peer);
1677 buffer_append(&kex->peer, blob, bloblen);
1678 xfree(blob);
1679 kex->done = 1;
1680 kex->flags = buffer_get_int(m);
1681 kex->client_version_string = buffer_get_string(m, NULL);
1682 kex->server_version_string = buffer_get_string(m, NULL);
1683 kex->load_host_key=&get_hostkey_by_type;
1684 kex->host_key_index=&get_hostkey_index;
1685
1686 return (kex);
1687}
1688
1689/* This function requries careful sanity checking */
1690
1691void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001692mm_get_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001693{
1694 Buffer m;
1695 u_char *blob, *p;
1696 u_int bloblen, plen;
Damien Millera5539d22003-04-09 20:50:06 +10001697 u_int32_t seqnr, packets;
1698 u_int64_t blocks;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001699
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001700 debug3("%s: Waiting for new keys", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001701
1702 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001703 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001704 if (!compat20) {
1705 child_state.ssh1protoflags = buffer_get_int(&m);
1706 child_state.ssh1cipher = buffer_get_int(&m);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001707 child_state.ssh1key = buffer_get_string(&m,
1708 &child_state.ssh1keylen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001709 child_state.ivout = buffer_get_string(&m,
1710 &child_state.ivoutlen);
1711 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1712 goto skip;
1713 } else {
1714 /* Get the Kex for rekeying */
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001715 *pmonitor->m_pkex = mm_get_kex(&m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001716 }
1717
1718 blob = buffer_get_string(&m, &bloblen);
1719 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1720 xfree(blob);
1721
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001722 debug3("%s: Waiting for second key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001723 blob = buffer_get_string(&m, &bloblen);
1724 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1725 xfree(blob);
1726
1727 /* Now get sequence numbers for the packets */
Damien Millera5539d22003-04-09 20:50:06 +10001728 seqnr = buffer_get_int(&m);
1729 blocks = buffer_get_int64(&m);
1730 packets = buffer_get_int(&m);
1731 packet_set_state(MODE_OUT, seqnr, blocks, packets);
1732 seqnr = buffer_get_int(&m);
1733 blocks = buffer_get_int64(&m);
1734 packets = buffer_get_int(&m);
1735 packet_set_state(MODE_IN, seqnr, blocks, packets);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001736
1737 skip:
1738 /* Get the key context */
1739 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1740 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1741
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001742 debug3("%s: Getting compression state", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001743 /* Get compression state */
1744 p = buffer_get_string(&m, &plen);
1745 if (plen != sizeof(child_state.outgoing))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001746 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001747 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1748 xfree(p);
1749
1750 p = buffer_get_string(&m, &plen);
1751 if (plen != sizeof(child_state.incoming))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001752 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001753 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1754 xfree(p);
1755
1756 /* Network I/O buffers */
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001757 debug3("%s: Getting Network I/O buffers", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001758 child_state.input = buffer_get_string(&m, &child_state.ilen);
1759 child_state.output = buffer_get_string(&m, &child_state.olen);
1760
1761 buffer_free(&m);
1762}
1763
1764
1765/* Allocation functions for zlib */
1766void *
1767mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1768{
Ben Lindstrom41ee2b02002-11-09 15:47:47 +00001769 size_t len = (size_t) size * ncount;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001770 void *address;
1771
Ben Lindstrom0a4f7542002-08-20 18:36:25 +00001772 if (len == 0 || ncount > SIZE_T_MAX / size)
Damien Miller530a7542002-06-26 23:27:11 +10001773 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1774
1775 address = mm_malloc(mm, len);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001776
1777 return (address);
1778}
1779
1780void
1781mm_zfree(struct mm_master *mm, void *address)
1782{
1783 mm_free(mm, address);
1784}
1785
1786void
1787mm_init_compression(struct mm_master *mm)
1788{
1789 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1790 outgoing_stream.zfree = (free_func)mm_zfree;
1791 outgoing_stream.opaque = mm;
1792
1793 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1794 incoming_stream.zfree = (free_func)mm_zfree;
1795 incoming_stream.opaque = mm;
1796}
1797
1798/* XXX */
1799
1800#define FD_CLOSEONEXEC(x) do { \
1801 if (fcntl(x, F_SETFD, 1) == -1) \
1802 fatal("fcntl(%d, F_SETFD)", x); \
1803} while (0)
1804
1805static void
1806monitor_socketpair(int *pair)
1807{
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001808#ifdef HAVE_SOCKETPAIR
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001809 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001810 fatal("%s: socketpair", __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001811#else
1812 fatal("%s: UsePrivilegeSeparation=yes not supported",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001813 __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001814#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001815 FD_CLOSEONEXEC(pair[0]);
1816 FD_CLOSEONEXEC(pair[1]);
1817}
1818
1819#define MM_MEMSIZE 65536
1820
1821struct monitor *
1822monitor_init(void)
1823{
1824 struct monitor *mon;
1825 int pair[2];
1826
Damien Miller07d86be2006-03-26 14:19:21 +11001827 mon = xcalloc(1, sizeof(*mon));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001828
1829 monitor_socketpair(pair);
1830
1831 mon->m_recvfd = pair[0];
1832 mon->m_sendfd = pair[1];
1833
1834 /* Used to share zlib space across processes */
Damien Miller2d6b8332002-06-21 15:59:49 +10001835 if (options.compression) {
1836 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1837 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001838
Damien Miller2d6b8332002-06-21 15:59:49 +10001839 /* Compression needs to share state across borders */
1840 mm_init_compression(mon->m_zlib);
1841 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001842
1843 return mon;
1844}
1845
1846void
1847monitor_reinit(struct monitor *mon)
1848{
1849 int pair[2];
1850
1851 monitor_socketpair(pair);
1852
1853 mon->m_recvfd = pair[0];
1854 mon->m_sendfd = pair[1];
1855}
Darren Tucker0efd1552003-08-26 11:49:55 +10001856
1857#ifdef GSSAPI
1858int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001859mm_answer_gss_setup_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001860{
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001861 gss_OID_desc goid;
Darren Tucker0efd1552003-08-26 11:49:55 +10001862 OM_uint32 major;
1863 u_int len;
1864
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001865 goid.elements = buffer_get_string(m, &len);
1866 goid.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001867
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001868 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
Darren Tucker0efd1552003-08-26 11:49:55 +10001869
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001870 xfree(goid.elements);
Darren Tucker0efd1552003-08-26 11:49:55 +10001871
1872 buffer_clear(m);
1873 buffer_put_int(m, major);
1874
Damien Miller6fd6def2005-11-05 15:07:05 +11001875 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001876
1877 /* Now we have a context, enable the step */
1878 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1879
1880 return (0);
1881}
1882
1883int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001884mm_answer_gss_accept_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001885{
1886 gss_buffer_desc in;
1887 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
Damien Miller6fd6def2005-11-05 15:07:05 +11001888 OM_uint32 major, minor;
Darren Tucker0efd1552003-08-26 11:49:55 +10001889 OM_uint32 flags = 0; /* GSI needs this */
Darren Tucker600ad8d2003-08-26 12:10:48 +10001890 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001891
Darren Tucker600ad8d2003-08-26 12:10:48 +10001892 in.value = buffer_get_string(m, &len);
1893 in.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001894 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1895 xfree(in.value);
1896
1897 buffer_clear(m);
1898 buffer_put_int(m, major);
1899 buffer_put_string(m, out.value, out.length);
1900 buffer_put_int(m, flags);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001901 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001902
1903 gss_release_buffer(&minor, &out);
1904
Damien Miller6fd6def2005-11-05 15:07:05 +11001905 if (major == GSS_S_COMPLETE) {
Darren Tucker0efd1552003-08-26 11:49:55 +10001906 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1907 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller0425d402003-11-17 22:18:21 +11001908 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
Darren Tucker0efd1552003-08-26 11:49:55 +10001909 }
1910 return (0);
1911}
1912
1913int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001914mm_answer_gss_checkmic(int sock, Buffer *m)
Damien Miller0425d402003-11-17 22:18:21 +11001915{
1916 gss_buffer_desc gssbuf, mic;
1917 OM_uint32 ret;
1918 u_int len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001919
Damien Miller0425d402003-11-17 22:18:21 +11001920 gssbuf.value = buffer_get_string(m, &len);
1921 gssbuf.length = len;
1922 mic.value = buffer_get_string(m, &len);
1923 mic.length = len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001924
Damien Miller0425d402003-11-17 22:18:21 +11001925 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +11001926
Damien Miller0425d402003-11-17 22:18:21 +11001927 xfree(gssbuf.value);
1928 xfree(mic.value);
Damien Miller787b2ec2003-11-21 23:56:47 +11001929
Damien Miller0425d402003-11-17 22:18:21 +11001930 buffer_clear(m);
1931 buffer_put_int(m, ret);
Damien Miller787b2ec2003-11-21 23:56:47 +11001932
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001933 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
Damien Miller787b2ec2003-11-21 23:56:47 +11001934
Damien Miller0425d402003-11-17 22:18:21 +11001935 if (!GSS_ERROR(ret))
1936 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller787b2ec2003-11-21 23:56:47 +11001937
Damien Miller0425d402003-11-17 22:18:21 +11001938 return (0);
1939}
1940
1941int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001942mm_answer_gss_userok(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001943{
1944 int authenticated;
1945
1946 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1947
1948 buffer_clear(m);
1949 buffer_put_int(m, authenticated);
1950
1951 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001952 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001953
Damien Miller6fd6def2005-11-05 15:07:05 +11001954 auth_method = "gssapi-with-mic";
Darren Tucker0efd1552003-08-26 11:49:55 +10001955
1956 /* Monitor loop will terminate if authenticated */
1957 return (authenticated);
1958}
1959#endif /* GSSAPI */