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djm@openbsd.org44732de2015-02-20 22:17:21 +00001/* $OpenBSD: monitor.c,v 1.145 2015/02/20 22:17:21 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>
Damien Millere3b60b52006-07-10 21:08:03 +100031#include <sys/socket.h>
Damien Millerd7834352006-08-05 12:39:39 +100032#include "openbsd-compat/sys-tree.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110033#include <sys/wait.h>
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000034
Darren Tucker39972492006-07-12 22:22:46 +100035#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100036#include <fcntl.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110037#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110038#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110039#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100040#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110041#include <signal.h>
Damien Miller9af21972015-02-24 09:04:32 +110042#ifdef HAVE_STDINT_H
millert@openbsd.orgfd368342015-02-06 23:21:59 +000043#include <stdint.h>
Damien Miller9af21972015-02-24 09:04:32 +110044#endif
Damien Millere7a1e5c2006-08-05 11:34:19 +100045#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100046#include <string.h>
Damien Miller86687062014-07-02 15:28:02 +100047#include <stdarg.h>
48#include <stdio.h>
Damien Miller607aede2006-09-01 15:48:19 +100049#include <unistd.h>
Damien Miller8f0bf232011-06-20 14:42:23 +100050#ifdef HAVE_POLL_H
51#include <poll.h>
52#else
53# ifdef HAVE_SYS_POLL_H
54# include <sys/poll.h>
55# endif
56#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000057
58#ifdef SKEY
59#include <skey.h>
60#endif
61
Damien Miller1f0311c2014-05-15 14:24:09 +100062#ifdef WITH_OPENSSL
Damien Miller03e20032006-03-15 11:16:59 +110063#include <openssl/dh.h>
Damien Miller1f0311c2014-05-15 14:24:09 +100064#endif
Damien Miller03e20032006-03-15 11:16:59 +110065
Damien Millerb84886b2008-05-19 15:05:07 +100066#include "openbsd-compat/sys-queue.h"
Damien Miller8f0bf232011-06-20 14:42:23 +100067#include "atomicio.h"
Damien Millerd7834352006-08-05 12:39:39 +100068#include "xmalloc.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000069#include "ssh.h"
Damien Millerd7834352006-08-05 12:39:39 +100070#include "key.h"
71#include "buffer.h"
72#include "hostfile.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000073#include "auth.h"
Damien Millerd7834352006-08-05 12:39:39 +100074#include "cipher.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000075#include "kex.h"
76#include "dh.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000077#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
78#undef TARGET_OS_MAC
Ben Lindstrom1b9f2a62004-04-08 05:11:03 +000079#include "zlib.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000080#define TARGET_OS_MAC 1
81#else
82#include "zlib.h"
83#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000084#include "packet.h"
85#include "auth-options.h"
86#include "sshpty.h"
87#include "channels.h"
88#include "session.h"
89#include "sshlogin.h"
90#include "canohost.h"
91#include "log.h"
Damien Miller7acefbb2014-07-18 14:11:24 +100092#include "misc.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000093#include "servconf.h"
94#include "monitor.h"
95#include "monitor_mm.h"
Damien Millerd7834352006-08-05 12:39:39 +100096#ifdef GSSAPI
97#include "ssh-gss.h"
98#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000099#include "monitor_wrap.h"
100#include "monitor_fdpass.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000101#include "compat.h"
102#include "ssh2.h"
Darren Tuckerb422afa2009-06-21 18:58:46 +1000103#include "roaming.h"
Damien Miller85b45e02013-07-20 13:21:52 +1000104#include "authfd.h"
djm@openbsd.org1f729f02015-01-13 07:39:19 +0000105#include "match.h"
djm@openbsd.org141efe42015-01-14 20:05:27 +0000106#include "ssherr.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000107
Darren Tucker0efd1552003-08-26 11:49:55 +1000108#ifdef GSSAPI
Darren Tucker0efd1552003-08-26 11:49:55 +1000109static Gssctxt *gsscontext = NULL;
110#endif
111
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000112/* Imports */
113extern ServerOptions options;
114extern u_int utmp_len;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000115extern u_char session_id[];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000116extern Buffer auth_debug;
117extern int auth_debug_init;
Darren Tucker09991742004-07-17 17:05:14 +1000118extern Buffer loginmsg;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000119
120/* State exported from the child */
markus@openbsd.org091c3022015-01-19 19:52:16 +0000121static struct sshbuf *child_state;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000122
Damien Miller469954d2003-06-18 20:25:33 +1000123/* Functions on the monitor that answer unprivileged requests */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000124
125int mm_answer_moduli(int, Buffer *);
126int mm_answer_sign(int, Buffer *);
127int mm_answer_pwnamallow(int, Buffer *);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000128int mm_answer_auth2_read_banner(int, Buffer *);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000129int mm_answer_authserv(int, Buffer *);
130int mm_answer_authpassword(int, Buffer *);
131int mm_answer_bsdauthquery(int, Buffer *);
132int mm_answer_bsdauthrespond(int, Buffer *);
133int mm_answer_skeyquery(int, Buffer *);
134int mm_answer_skeyrespond(int, Buffer *);
135int mm_answer_keyallowed(int, Buffer *);
136int mm_answer_keyverify(int, Buffer *);
137int mm_answer_pty(int, Buffer *);
138int mm_answer_pty_cleanup(int, Buffer *);
139int mm_answer_term(int, Buffer *);
140int mm_answer_rsa_keyallowed(int, Buffer *);
141int mm_answer_rsa_challenge(int, Buffer *);
142int mm_answer_rsa_response(int, Buffer *);
143int mm_answer_sesskey(int, Buffer *);
144int mm_answer_sessid(int, Buffer *);
145
Damien Miller79418552002-04-23 20:28:48 +1000146#ifdef USE_PAM
147int mm_answer_pam_start(int, Buffer *);
Damien Miller1f499fd2003-08-25 13:08:49 +1000148int mm_answer_pam_account(int, Buffer *);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000149int mm_answer_pam_init_ctx(int, Buffer *);
150int mm_answer_pam_query(int, Buffer *);
151int mm_answer_pam_respond(int, Buffer *);
152int mm_answer_pam_free_ctx(int, Buffer *);
Damien Miller79418552002-04-23 20:28:48 +1000153#endif
154
Darren Tucker0efd1552003-08-26 11:49:55 +1000155#ifdef GSSAPI
156int mm_answer_gss_setup_ctx(int, Buffer *);
157int mm_answer_gss_accept_ctx(int, Buffer *);
158int mm_answer_gss_userok(int, Buffer *);
Damien Miller0425d402003-11-17 22:18:21 +1100159int mm_answer_gss_checkmic(int, Buffer *);
Darren Tucker0efd1552003-08-26 11:49:55 +1000160#endif
Damien Miller25162f22002-09-12 09:47:29 +1000161
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100162#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100163int mm_answer_audit_event(int, Buffer *);
164int mm_answer_audit_command(int, Buffer *);
165#endif
166
Damien Miller8f0bf232011-06-20 14:42:23 +1000167static int monitor_read_log(struct monitor *);
168
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000169static Authctxt *authctxt;
Damien Miller1f0311c2014-05-15 14:24:09 +1000170
171#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000172static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
Damien Miller1f0311c2014-05-15 14:24:09 +1000173#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000174
175/* local state for key verify */
176static u_char *key_blob = NULL;
177static u_int key_bloblen = 0;
178static int key_blobtype = MM_NOKEY;
Damien Millera10f5612002-09-12 09:49:15 +1000179static char *hostbased_cuser = NULL;
180static char *hostbased_chost = NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000181static char *auth_method = "unknown";
Damien Miller15b05cf2012-12-03 09:53:20 +1100182static char *auth_submethod = NULL;
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[] = {
Damien Miller1f0311c2014-05-15 14:24:09 +1000203#ifdef WITH_OPENSSL
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000204 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
Damien Miller1f0311c2014-05-15 14:24:09 +1000205#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000206 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
207 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
208 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
Damien Miller5ad9fd92002-05-13 11:07:41 +1000209 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000210 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller79418552002-04-23 20:28:48 +1000211#ifdef USE_PAM
212 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000213 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000214 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
215 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
216 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
217 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Kevin Stevesbd1901b2002-04-01 18:04:35 +0000218#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100219#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100220 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100221#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000222#ifdef BSD_AUTH
223 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100224 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000225#endif
226#ifdef SKEY
227 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
228 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
229#endif
230 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
231 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
Darren Tucker0efd1552003-08-26 11:49:55 +1000232#ifdef GSSAPI
233 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
234 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
235 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
Damien Miller0425d402003-11-17 22:18:21 +1100236 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
Darren Tucker0efd1552003-08-26 11:49:55 +1000237#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000238 {0, 0, NULL}
239};
240
241struct mon_table mon_dispatch_postauth20[] = {
Damien Miller1f0311c2014-05-15 14:24:09 +1000242#ifdef WITH_OPENSSL
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000243 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
Damien Miller1f0311c2014-05-15 14:24:09 +1000244#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000245 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
246 {MONITOR_REQ_PTY, 0, mm_answer_pty},
247 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
248 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100249#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100250 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
251 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
252#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000253 {0, 0, NULL}
254};
255
256struct mon_table mon_dispatch_proto15[] = {
Damien Miller1f0311c2014-05-15 14:24:09 +1000257#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000258 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
259 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
260 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
261 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller7a8f5b32006-03-31 23:14:23 +1100262 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
263 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000264 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
265 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
266#ifdef BSD_AUTH
267 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100268 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000269#endif
270#ifdef SKEY
271 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
272 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
273#endif
Damien Millera33501b2002-05-08 12:24:42 +1000274#ifdef USE_PAM
275 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000276 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000277 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
278 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
279 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
280 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Damien Millera33501b2002-05-08 12:24:42 +1000281#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100282#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100283 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100284#endif
Damien Miller1f0311c2014-05-15 14:24:09 +1000285#endif /* WITH_SSH1 */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000286 {0, 0, NULL}
287};
288
289struct mon_table mon_dispatch_postauth15[] = {
Damien Miller1f0311c2014-05-15 14:24:09 +1000290#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000291 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
292 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
293 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100294#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100295 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker5965ae12006-09-17 12:00:13 +1000296 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100297#endif
Damien Miller1f0311c2014-05-15 14:24:09 +1000298#endif /* WITH_SSH1 */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000299 {0, 0, NULL}
300};
301
302struct mon_table *mon_dispatch;
303
304/* Specifies if a certain message is allowed at the moment */
305
306static void
307monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
308{
309 while (ent->f != NULL) {
310 if (ent->type == type) {
311 ent->flags &= ~MON_PERMIT;
312 ent->flags |= permit ? MON_PERMIT : 0;
313 return;
314 }
315 ent++;
316 }
317}
318
319static void
320monitor_permit_authentications(int permit)
321{
322 struct mon_table *ent = mon_dispatch;
323
324 while (ent->f != NULL) {
325 if (ent->flags & MON_AUTH) {
326 ent->flags &= ~MON_PERMIT;
327 ent->flags |= permit ? MON_PERMIT : 0;
328 }
329 ent++;
330 }
331}
332
Darren Tucker3e33cec2003-10-02 16:12:36 +1000333void
334monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000335{
336 struct mon_table *ent;
Damien Miller15b05cf2012-12-03 09:53:20 +1100337 int authenticated = 0, partial = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000338
339 debug3("preauth child monitor started");
340
Damien Miller8f0bf232011-06-20 14:42:23 +1000341 close(pmonitor->m_recvfd);
342 close(pmonitor->m_log_sendfd);
343 pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
344
Darren Tucker3e33cec2003-10-02 16:12:36 +1000345 authctxt = _authctxt;
346 memset(authctxt, 0, sizeof(*authctxt));
347
Darren Tuckerde0de392005-03-31 23:52:04 +1000348 authctxt->loginmsg = &loginmsg;
349
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000350 if (compat20) {
351 mon_dispatch = mon_dispatch_proto20;
352
353 /* Permit requests for moduli and signatures */
354 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
355 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
356 } else {
357 mon_dispatch = mon_dispatch_proto15;
358
359 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
360 }
361
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000362 /* The first few requests do not require asynchronous access */
363 while (!authenticated) {
Damien Miller15b05cf2012-12-03 09:53:20 +1100364 partial = 0;
Damien Miller7a8f5b32006-03-31 23:14:23 +1100365 auth_method = "unknown";
Damien Miller15b05cf2012-12-03 09:53:20 +1100366 auth_submethod = NULL;
Darren Tuckerfbba7352006-11-07 23:16:08 +1100367 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
Damien Millera6e3f012012-11-04 23:21:40 +1100368
369 /* Special handling for multiple required authentications */
370 if (options.num_auth_methods != 0) {
371 if (!compat20)
372 fatal("AuthenticationMethods is not supported"
373 "with SSH protocol 1");
374 if (authenticated &&
375 !auth2_update_methods_lists(authctxt,
Damien Miller91a55f22013-04-23 15:18:10 +1000376 auth_method, auth_submethod)) {
Damien Millera6e3f012012-11-04 23:21:40 +1100377 debug3("%s: method %s: partial", __func__,
378 auth_method);
379 authenticated = 0;
Damien Miller15b05cf2012-12-03 09:53:20 +1100380 partial = 1;
Damien Millera6e3f012012-11-04 23:21:40 +1100381 }
382 }
383
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000384 if (authenticated) {
385 if (!(ent->flags & MON_AUTHDECIDE))
386 fatal("%s: unexpected authentication from %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000387 __func__, ent->type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000388 if (authctxt->pw->pw_uid == 0 &&
389 !auth_root_allowed(auth_method))
390 authenticated = 0;
Damien Miller1f499fd2003-08-25 13:08:49 +1000391#ifdef USE_PAM
392 /* PAM needs to perform account checks after auth */
Damien Miller6aef38f2003-11-18 10:45:20 +1100393 if (options.use_pam && authenticated) {
Damien Miller1f499fd2003-08-25 13:08:49 +1000394 Buffer m;
395
396 buffer_init(&m);
Damien Millera8e06ce2003-11-21 23:48:55 +1100397 mm_request_receive_expect(pmonitor->m_sendfd,
Damien Miller1f499fd2003-08-25 13:08:49 +1000398 MONITOR_REQ_PAM_ACCOUNT, &m);
399 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
400 buffer_free(&m);
401 }
402#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000403 }
Damien Miller7a8f5b32006-03-31 23:14:23 +1100404 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
Damien Miller15b05cf2012-12-03 09:53:20 +1100405 auth_log(authctxt, authenticated, partial,
Darren Tucker0acca372013-06-02 07:41:51 +1000406 auth_method, auth_submethod);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000407 if (!authenticated)
408 authctxt->failures++;
409 }
410 }
411
412 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000413 fatal("%s: authenticated invalid user", __func__);
Damien Miller7a8f5b32006-03-31 23:14:23 +1100414 if (strcmp(auth_method, "unknown") == 0)
415 fatal("%s: authentication method name unknown", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000416
417 debug("%s: %s has been authenticated by privileged process",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000418 __func__, authctxt->user);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000419
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000420 mm_get_keystate(pmonitor);
Damien Miller8f0bf232011-06-20 14:42:23 +1000421
Damien Miller6a1937e2012-12-12 10:44:38 +1100422 /* Drain any buffered messages from the child */
423 while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
424 ;
425
Damien Miller8f0bf232011-06-20 14:42:23 +1000426 close(pmonitor->m_sendfd);
427 close(pmonitor->m_log_recvfd);
428 pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000429}
430
Damien Millerbe64d432003-05-14 19:31:12 +1000431static void
432monitor_set_child_handler(pid_t pid)
433{
434 monitor_child_pid = pid;
435}
436
437static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000438monitor_child_handler(int sig)
Damien Millerbe64d432003-05-14 19:31:12 +1000439{
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000440 kill(monitor_child_pid, sig);
Damien Millerbe64d432003-05-14 19:31:12 +1000441}
442
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000443void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000444monitor_child_postauth(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000445{
Damien Miller8f0bf232011-06-20 14:42:23 +1000446 close(pmonitor->m_recvfd);
447 pmonitor->m_recvfd = -1;
448
Damien Millerbe64d432003-05-14 19:31:12 +1000449 monitor_set_child_handler(pmonitor->m_pid);
450 signal(SIGHUP, &monitor_child_handler);
451 signal(SIGTERM, &monitor_child_handler);
Darren Tucker7fa339b2007-05-20 15:10:16 +1000452 signal(SIGINT, &monitor_child_handler);
Damien Miller146218a2014-08-27 04:11:55 +1000453#ifdef SIGXFSZ
454 signal(SIGXFSZ, SIG_IGN);
455#endif
Damien Millerbe64d432003-05-14 19:31:12 +1000456
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000457 if (compat20) {
458 mon_dispatch = mon_dispatch_postauth20;
459
460 /* Permit requests for moduli and signatures */
461 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
462 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
463 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000464 } else {
465 mon_dispatch = mon_dispatch_postauth15;
466 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
467 }
468 if (!no_pty_flag) {
469 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
470 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
471 }
472
473 for (;;)
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000474 monitor_read(pmonitor, mon_dispatch, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000475}
476
477void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000478monitor_sync(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000479{
Damien Miller2d6b8332002-06-21 15:59:49 +1000480 if (options.compression) {
481 /* The member allocation is not visible, so sync it */
482 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
483 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000484}
485
markus@openbsd.org091c3022015-01-19 19:52:16 +0000486/* Allocation functions for zlib */
487static void *
488mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
489{
490 size_t len = (size_t) size * ncount;
491 void *address;
492
millert@openbsd.orgfd368342015-02-06 23:21:59 +0000493 if (len == 0 || ncount > SIZE_MAX / size)
markus@openbsd.org091c3022015-01-19 19:52:16 +0000494 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
495
496 address = mm_malloc(mm, len);
497
498 return (address);
499}
500
501static void
502mm_zfree(struct mm_master *mm, void *address)
503{
504 mm_free(mm, address);
505}
506
Damien Miller8f0bf232011-06-20 14:42:23 +1000507static int
508monitor_read_log(struct monitor *pmonitor)
509{
510 Buffer logmsg;
511 u_int len, level;
512 char *msg;
513
514 buffer_init(&logmsg);
515
516 /* Read length */
517 buffer_append_space(&logmsg, 4);
518 if (atomicio(read, pmonitor->m_log_recvfd,
519 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) {
520 if (errno == EPIPE) {
Damien Millera2876db2012-02-11 08:16:06 +1100521 buffer_free(&logmsg);
Damien Miller8f0bf232011-06-20 14:42:23 +1000522 debug("%s: child log fd closed", __func__);
523 close(pmonitor->m_log_recvfd);
524 pmonitor->m_log_recvfd = -1;
525 return -1;
526 }
527 fatal("%s: log fd read: %s", __func__, strerror(errno));
528 }
529 len = buffer_get_int(&logmsg);
530 if (len <= 4 || len > 8192)
531 fatal("%s: invalid log message length %u", __func__, len);
532
533 /* Read severity, message */
534 buffer_clear(&logmsg);
535 buffer_append_space(&logmsg, len);
536 if (atomicio(read, pmonitor->m_log_recvfd,
537 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg))
538 fatal("%s: log fd read: %s", __func__, strerror(errno));
539
540 /* Log it */
541 level = buffer_get_int(&logmsg);
542 msg = buffer_get_string(&logmsg, NULL);
543 if (log_level_name(level) == NULL)
544 fatal("%s: invalid log level %u (corrupted message?)",
545 __func__, level);
546 do_log2(level, "%s [preauth]", msg);
547
548 buffer_free(&logmsg);
Darren Tuckera627d422013-06-02 07:31:17 +1000549 free(msg);
Damien Miller8f0bf232011-06-20 14:42:23 +1000550
551 return 0;
552}
553
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000554int
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000555monitor_read(struct monitor *pmonitor, struct mon_table *ent,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000556 struct mon_table **pent)
557{
558 Buffer m;
559 int ret;
560 u_char type;
Damien Miller8f0bf232011-06-20 14:42:23 +1000561 struct pollfd pfd[2];
562
563 for (;;) {
Damien Miller1d2c4562014-02-04 11:18:20 +1100564 memset(&pfd, 0, sizeof(pfd));
Damien Miller8f0bf232011-06-20 14:42:23 +1000565 pfd[0].fd = pmonitor->m_sendfd;
566 pfd[0].events = POLLIN;
567 pfd[1].fd = pmonitor->m_log_recvfd;
568 pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
Damien Miller7741ce82011-08-06 06:15:15 +1000569 if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
570 if (errno == EINTR || errno == EAGAIN)
571 continue;
Damien Miller8f0bf232011-06-20 14:42:23 +1000572 fatal("%s: poll: %s", __func__, strerror(errno));
Damien Miller7741ce82011-08-06 06:15:15 +1000573 }
Damien Miller8f0bf232011-06-20 14:42:23 +1000574 if (pfd[1].revents) {
575 /*
576 * Drain all log messages before processing next
577 * monitor request.
578 */
579 monitor_read_log(pmonitor);
580 continue;
581 }
582 if (pfd[0].revents)
583 break; /* Continues below */
584 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000585
586 buffer_init(&m);
587
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000588 mm_request_receive(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000589 type = buffer_get_char(&m);
590
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000591 debug3("%s: checking request %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000592
593 while (ent->f != NULL) {
594 if (ent->type == type)
595 break;
596 ent++;
597 }
598
599 if (ent->f != NULL) {
600 if (!(ent->flags & MON_PERMIT))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000601 fatal("%s: unpermitted request %d", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000602 type);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000603 ret = (*ent->f)(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000604 buffer_free(&m);
605
606 /* The child may use this request only once, disable it */
607 if (ent->flags & MON_ONCE) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000608 debug2("%s: %d used once, disabling now", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000609 type);
610 ent->flags &= ~MON_PERMIT;
611 }
612
613 if (pent != NULL)
614 *pent = ent;
615
616 return ret;
617 }
618
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000619 fatal("%s: unsupported request: %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000620
621 /* NOTREACHED */
622 return (-1);
623}
624
625/* allowed key state */
626static int
627monitor_allowed_key(u_char *blob, u_int bloblen)
628{
629 /* make sure key is allowed */
630 if (key_blob == NULL || key_bloblen != bloblen ||
Damien Millerea1651c2010-07-16 13:58:37 +1000631 timingsafe_bcmp(key_blob, blob, key_bloblen))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000632 return (0);
633 return (1);
634}
635
636static void
637monitor_reset_key_state(void)
638{
639 /* reset state */
Darren Tuckera627d422013-06-02 07:31:17 +1000640 free(key_blob);
641 free(hostbased_cuser);
642 free(hostbased_chost);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000643 key_blob = NULL;
644 key_bloblen = 0;
645 key_blobtype = MM_NOKEY;
646 hostbased_cuser = NULL;
647 hostbased_chost = NULL;
648}
649
Damien Miller1f0311c2014-05-15 14:24:09 +1000650#ifdef WITH_OPENSSL
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000651int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000652mm_answer_moduli(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000653{
654 DH *dh;
655 int min, want, max;
656
657 min = buffer_get_int(m);
658 want = buffer_get_int(m);
659 max = buffer_get_int(m);
660
661 debug3("%s: got parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000662 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000663 /* We need to check here, too, in case the child got corrupted */
664 if (max < min || want < min || max < want)
665 fatal("%s: bad parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000666 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000667
668 buffer_clear(m);
669
670 dh = choose_dh(min, want, max);
671 if (dh == NULL) {
672 buffer_put_char(m, 0);
673 return (0);
674 } else {
675 /* Send first bignum */
676 buffer_put_char(m, 1);
677 buffer_put_bignum2(m, dh->p);
678 buffer_put_bignum2(m, dh->g);
679
680 DH_free(dh);
681 }
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000682 mm_request_send(sock, MONITOR_ANS_MODULI, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000683 return (0);
684}
Damien Miller1f0311c2014-05-15 14:24:09 +1000685#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000686
687int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000688mm_answer_sign(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000689{
djm@openbsd.org523463a2015-02-16 22:13:32 +0000690 struct ssh *ssh = active_state; /* XXX */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000691 extern int auth_sock; /* XXX move to state struct? */
692 struct sshkey *key;
djm@openbsd.org523463a2015-02-16 22:13:32 +0000693 struct sshbuf *sigbuf;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000694 u_char *p;
695 u_char *signature;
djm@openbsd.org141efe42015-01-14 20:05:27 +0000696 size_t datlen, siglen;
djm@openbsd.org523463a2015-02-16 22:13:32 +0000697 int r, keyid, is_proof = 0;
djm@openbsd.org44732de2015-02-20 22:17:21 +0000698 const char proof_req[] = "hostkeys-prove-00@openssh.com";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000699
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000700 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000701
djm@openbsd.org141efe42015-01-14 20:05:27 +0000702 if ((r = sshbuf_get_u32(m, &keyid)) != 0 ||
703 (r = sshbuf_get_string(m, &p, &datlen)) != 0)
704 fatal("%s: buffer error: %s", __func__, ssh_err(r));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000705
Damien Millera63128d2006-03-15 12:08:28 +1100706 /*
Damien Miller041ab7c2010-09-10 11:23:34 +1000707 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
708 * SHA384 (48 bytes) and SHA512 (64 bytes).
djm@openbsd.org523463a2015-02-16 22:13:32 +0000709 *
710 * Otherwise, verify the signature request is for a hostkey
711 * proof.
712 *
713 * XXX perform similar check for KEX signature requests too?
714 * it's not trivial, since what is signed is the hash, rather
715 * than the full kex structure...
Damien Millera63128d2006-03-15 12:08:28 +1100716 */
djm@openbsd.org523463a2015-02-16 22:13:32 +0000717 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) {
718 /*
719 * Construct expected hostkey proof and compare it to what
720 * the client sent us.
721 */
722 if (session_id2_len == 0) /* hostkeys is never first */
723 fatal("%s: bad data length: %zu", __func__, datlen);
724 if ((key = get_hostkey_public_by_index(keyid, ssh)) == NULL)
725 fatal("%s: no hostkey for index %d", __func__, keyid);
726 if ((sigbuf = sshbuf_new()) == NULL)
727 fatal("%s: sshbuf_new", __func__);
djm@openbsd.org44732de2015-02-20 22:17:21 +0000728 if ((r = sshbuf_put_cstring(sigbuf, proof_req)) != 0 ||
729 (r = sshbuf_put_string(sigbuf, session_id2,
djm@openbsd.org523463a2015-02-16 22:13:32 +0000730 session_id2_len) != 0) ||
djm@openbsd.org523463a2015-02-16 22:13:32 +0000731 (r = sshkey_puts(key, sigbuf)) != 0)
732 fatal("%s: couldn't prepare private key "
733 "proof buffer: %s", __func__, ssh_err(r));
734 if (datlen != sshbuf_len(sigbuf) ||
735 memcmp(p, sshbuf_ptr(sigbuf), sshbuf_len(sigbuf)) != 0)
736 fatal("%s: bad data length: %zu, hostkey proof len %zu",
737 __func__, datlen, sshbuf_len(sigbuf));
738 sshbuf_free(sigbuf);
739 is_proof = 1;
740 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000741
Ben Lindstromf67e0772002-06-06 20:58:19 +0000742 /* save session id, it will be passed on the first call */
743 if (session_id2_len == 0) {
744 session_id2_len = datlen;
745 session_id2 = xmalloc(session_id2_len);
746 memcpy(session_id2, p, session_id2_len);
747 }
748
Damien Miller85b45e02013-07-20 13:21:52 +1000749 if ((key = get_hostkey_by_index(keyid)) != NULL) {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000750 if ((r = sshkey_sign(key, &signature, &siglen, p, datlen,
751 datafellows)) != 0)
752 fatal("%s: sshkey_sign failed: %s",
753 __func__, ssh_err(r));
djm@openbsd.org523463a2015-02-16 22:13:32 +0000754 } else if ((key = get_hostkey_public_by_index(keyid, ssh)) != NULL &&
djm@openbsd.org141efe42015-01-14 20:05:27 +0000755 auth_sock > 0) {
756 if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
757 p, datlen, datafellows)) != 0) {
758 fatal("%s: ssh_agent_sign failed: %s",
759 __func__, ssh_err(r));
760 }
Damien Miller85b45e02013-07-20 13:21:52 +1000761 } else
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000762 fatal("%s: no hostkey from index %d", __func__, keyid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000763
djm@openbsd.org523463a2015-02-16 22:13:32 +0000764 debug3("%s: %s signature %p(%zu)", __func__,
765 is_proof ? "KEX" : "hostkey proof", signature, siglen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000766
djm@openbsd.org141efe42015-01-14 20:05:27 +0000767 sshbuf_reset(m);
768 if ((r = sshbuf_put_string(m, signature, siglen)) != 0)
769 fatal("%s: buffer error: %s", __func__, ssh_err(r));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000770
Darren Tuckera627d422013-06-02 07:31:17 +1000771 free(p);
772 free(signature);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000773
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000774 mm_request_send(sock, MONITOR_ANS_SIGN, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000775
776 /* Turn on permissions for getpwnam */
777 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
778
779 return (0);
780}
781
782/* Retrieves the password entry and also checks if the user is permitted */
783
784int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000785mm_answer_pwnamallow(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000786{
Darren Tuckerb09b6772004-06-22 15:06:46 +1000787 char *username;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000788 struct passwd *pwent;
789 int allowed = 0;
Damien Millerd8478b62011-05-29 21:39:36 +1000790 u_int i;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000791
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000792 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000793
794 if (authctxt->attempt++ != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000795 fatal("%s: multiple attempts for getpwnam", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000796
Darren Tuckerb09b6772004-06-22 15:06:46 +1000797 username = buffer_get_string(m, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000798
Darren Tuckerb09b6772004-06-22 15:06:46 +1000799 pwent = getpwnamallow(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000800
Darren Tuckerb09b6772004-06-22 15:06:46 +1000801 authctxt->user = xstrdup(username);
802 setproctitle("%s [priv]", pwent ? username : "unknown");
Darren Tuckera627d422013-06-02 07:31:17 +1000803 free(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000804
805 buffer_clear(m);
806
807 if (pwent == NULL) {
808 buffer_put_char(m, 0);
Damien Millerf96d1832003-11-18 22:01:48 +1100809 authctxt->pw = fakepw();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000810 goto out;
811 }
812
813 allowed = 1;
814 authctxt->pw = pwent;
815 authctxt->valid = 1;
816
817 buffer_put_char(m, 1);
818 buffer_put_string(m, pwent, sizeof(struct passwd));
819 buffer_put_cstring(m, pwent->pw_name);
820 buffer_put_cstring(m, "*");
Damien Miller6332da22013-04-23 14:25:52 +1000821#ifdef HAVE_STRUCT_PASSWD_PW_GECOS
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000822 buffer_put_cstring(m, pwent->pw_gecos);
Damien Miller6332da22013-04-23 14:25:52 +1000823#endif
824#ifdef HAVE_STRUCT_PASSWD_PW_CLASS
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000825 buffer_put_cstring(m, pwent->pw_class);
Kevin Steves7e147602002-03-22 18:07:17 +0000826#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000827 buffer_put_cstring(m, pwent->pw_dir);
828 buffer_put_cstring(m, pwent->pw_shell);
Darren Tucker2f8b3d92007-12-02 23:02:15 +1100829
830 out:
Darren Tucker1629c072007-02-19 22:25:37 +1100831 buffer_put_string(m, &options, sizeof(options));
Damien Millerf2e407e2011-05-20 19:04:14 +1000832
833#define M_CP_STROPT(x) do { \
834 if (options.x != NULL) \
835 buffer_put_cstring(m, options.x); \
836 } while (0)
Damien Millerd8478b62011-05-29 21:39:36 +1000837#define M_CP_STRARRAYOPT(x, nx) do { \
838 for (i = 0; i < options.nx; i++) \
839 buffer_put_cstring(m, options.x[i]); \
840 } while (0)
Damien Millerf2e407e2011-05-20 19:04:14 +1000841 /* See comment in servconf.h */
842 COPY_MATCH_STRING_OPTS();
843#undef M_CP_STROPT
Damien Millerd8478b62011-05-29 21:39:36 +1000844#undef M_CP_STRARRAYOPT
Damien Millera6e3f012012-11-04 23:21:40 +1100845
846 /* Create valid auth method lists */
847 if (compat20 && auth2_setup_methods_lists(authctxt) != 0) {
848 /*
849 * The monitor will continue long enough to let the child
850 * run to it's packet_disconnect(), but it must not allow any
851 * authentication to succeed.
852 */
853 debug("%s: no valid authentication method lists", __func__);
854 }
855
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000856 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000857 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000858
859 /* For SSHv1 allow authentication now */
860 if (!compat20)
861 monitor_permit_authentications(1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000862 else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000863 /* Allow service/style information on the auth context */
864 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000865 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
866 }
Damien Millera33501b2002-05-08 12:24:42 +1000867#ifdef USE_PAM
Damien Miller4e448a32003-05-14 15:11:48 +1000868 if (options.use_pam)
869 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
Damien Millera33501b2002-05-08 12:24:42 +1000870#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000871
872 return (0);
873}
874
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000875int mm_answer_auth2_read_banner(int sock, Buffer *m)
Damien Miller5ad9fd92002-05-13 11:07:41 +1000876{
877 char *banner;
878
879 buffer_clear(m);
880 banner = auth2_read_banner();
881 buffer_put_cstring(m, banner != NULL ? banner : "");
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000882 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
Darren Tuckera627d422013-06-02 07:31:17 +1000883 free(banner);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000884
885 return (0);
886}
887
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000888int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000889mm_answer_authserv(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000890{
891 monitor_permit_authentications(1);
892
893 authctxt->service = buffer_get_string(m, NULL);
894 authctxt->style = buffer_get_string(m, NULL);
895 debug3("%s: service=%s, style=%s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000896 __func__, authctxt->service, authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000897
898 if (strlen(authctxt->style) == 0) {
Darren Tuckera627d422013-06-02 07:31:17 +1000899 free(authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000900 authctxt->style = NULL;
901 }
902
903 return (0);
904}
905
906int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000907mm_answer_authpassword(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000908{
909 static int call_count;
910 char *passwd;
Ben Lindstrom7cea16b2002-07-23 21:13:40 +0000911 int authenticated;
912 u_int plen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000913
914 passwd = buffer_get_string(m, &plen);
915 /* Only authenticate if the context is valid */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000916 authenticated = options.password_authentication &&
Damien Miller856f0be2003-09-03 07:32:45 +1000917 auth_password(authctxt, passwd);
Damien Millera5103f42014-02-04 11:20:14 +1100918 explicit_bzero(passwd, strlen(passwd));
Darren Tuckera627d422013-06-02 07:31:17 +1000919 free(passwd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000920
921 buffer_clear(m);
922 buffer_put_int(m, authenticated);
923
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000924 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000925 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000926
927 call_count++;
928 if (plen == 0 && call_count == 1)
929 auth_method = "none";
930 else
931 auth_method = "password";
932
933 /* Causes monitor loop to terminate if authenticated */
934 return (authenticated);
935}
936
937#ifdef BSD_AUTH
938int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000939mm_answer_bsdauthquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000940{
941 char *name, *infotxt;
942 u_int numprompts;
943 u_int *echo_on;
944 char **prompts;
Damien Millerb7df3af2003-02-24 11:55:46 +1100945 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000946
Damien Millerb7df3af2003-02-24 11:55:46 +1100947 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
948 &prompts, &echo_on) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000949
950 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100951 buffer_put_int(m, success);
952 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000953 buffer_put_cstring(m, prompts[0]);
954
Damien Millerb7df3af2003-02-24 11:55:46 +1100955 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000956 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000957
Damien Millerb7df3af2003-02-24 11:55:46 +1100958 if (success) {
Darren Tuckera627d422013-06-02 07:31:17 +1000959 free(name);
960 free(infotxt);
961 free(prompts);
962 free(echo_on);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000963 }
964
965 return (0);
966}
967
968int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000969mm_answer_bsdauthrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000970{
971 char *response;
972 int authok;
973
974 if (authctxt->as == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000975 fatal("%s: no bsd auth session", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000976
977 response = buffer_get_string(m, NULL);
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000978 authok = options.challenge_response_authentication &&
979 auth_userresponse(authctxt->as, response, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000980 authctxt->as = NULL;
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000981 debug3("%s: <%s> = <%d>", __func__, response, authok);
Darren Tuckera627d422013-06-02 07:31:17 +1000982 free(response);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000983
984 buffer_clear(m);
985 buffer_put_int(m, authok);
986
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000987 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000988 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000989
Damien Miller91a55f22013-04-23 15:18:10 +1000990 if (compat20) {
991 auth_method = "keyboard-interactive";
992 auth_submethod = "bsdauth";
993 } else
Damien Millera6e3f012012-11-04 23:21:40 +1100994 auth_method = "bsdauth";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000995
996 return (authok != 0);
997}
998#endif
999
1000#ifdef SKEY
1001int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001002mm_answer_skeyquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001003{
1004 struct skey skey;
1005 char challenge[1024];
Damien Millerb7df3af2003-02-24 11:55:46 +11001006 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001007
Darren Tucker06a8cfe2004-04-14 17:24:30 +10001008 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
1009 sizeof(challenge)) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001010
1011 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +11001012 buffer_put_int(m, success);
1013 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001014 buffer_put_cstring(m, challenge);
1015
Damien Millerb7df3af2003-02-24 11:55:46 +11001016 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001017 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001018
1019 return (0);
1020}
1021
1022int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001023mm_answer_skeyrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001024{
1025 char *response;
1026 int authok;
1027
1028 response = buffer_get_string(m, NULL);
1029
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001030 authok = (options.challenge_response_authentication &&
1031 authctxt->valid &&
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001032 skey_haskey(authctxt->pw->pw_name) == 0 &&
1033 skey_passcheck(authctxt->pw->pw_name, response) != -1);
1034
Darren Tuckerf60845f2013-06-02 08:07:31 +10001035 free(response);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001036
1037 buffer_clear(m);
1038 buffer_put_int(m, authok);
1039
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001040 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001041 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001042
1043 auth_method = "skey";
1044
1045 return (authok != 0);
1046}
1047#endif
1048
Damien Miller79418552002-04-23 20:28:48 +10001049#ifdef USE_PAM
1050int
Darren Tucker7eda5922004-06-22 13:22:50 +10001051mm_answer_pam_start(int sock, Buffer *m)
Damien Miller79418552002-04-23 20:28:48 +10001052{
Damien Miller4e448a32003-05-14 15:11:48 +10001053 if (!options.use_pam)
1054 fatal("UsePAM not set, but ended up in %s anyway", __func__);
1055
Darren Tuckerdbf7a742004-03-08 23:04:06 +11001056 start_pam(authctxt);
Damien Miller79418552002-04-23 20:28:48 +10001057
Damien Miller1f499fd2003-08-25 13:08:49 +10001058 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
1059
Damien Miller79418552002-04-23 20:28:48 +10001060 return (0);
1061}
Damien Miller4f9f42a2003-05-10 19:28:02 +10001062
Damien Miller1f499fd2003-08-25 13:08:49 +10001063int
Darren Tucker7eda5922004-06-22 13:22:50 +10001064mm_answer_pam_account(int sock, Buffer *m)
Damien Miller1f499fd2003-08-25 13:08:49 +10001065{
1066 u_int ret;
Damien Miller787b2ec2003-11-21 23:56:47 +11001067
Damien Miller1f499fd2003-08-25 13:08:49 +10001068 if (!options.use_pam)
1069 fatal("UsePAM not set, but ended up in %s anyway", __func__);
1070
1071 ret = do_pam_account();
1072
1073 buffer_put_int(m, ret);
Darren Tuckerd4f04ae2005-09-30 10:23:21 +10001074 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
Damien Miller1f499fd2003-08-25 13:08:49 +10001075
Darren Tucker7eda5922004-06-22 13:22:50 +10001076 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
Damien Miller1f499fd2003-08-25 13:08:49 +10001077
1078 return (ret);
1079}
1080
Damien Miller4f9f42a2003-05-10 19:28:02 +10001081static void *sshpam_ctxt, *sshpam_authok;
1082extern KbdintDevice sshpam_device;
1083
1084int
Darren Tucker7eda5922004-06-22 13:22:50 +10001085mm_answer_pam_init_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +10001086{
1087
1088 debug3("%s", __func__);
1089 authctxt->user = buffer_get_string(m, NULL);
1090 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
1091 sshpam_authok = NULL;
1092 buffer_clear(m);
1093 if (sshpam_ctxt != NULL) {
1094 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
1095 buffer_put_int(m, 1);
1096 } else {
1097 buffer_put_int(m, 0);
1098 }
Darren Tucker7eda5922004-06-22 13:22:50 +10001099 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001100 return (0);
1101}
1102
1103int
Darren Tucker7eda5922004-06-22 13:22:50 +10001104mm_answer_pam_query(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +10001105{
Darren Tucker8b7a0552010-08-03 15:50:16 +10001106 char *name = NULL, *info = NULL, **prompts = NULL;
1107 u_int i, num = 0, *echo_on = 0;
Damien Miller04b65332005-07-17 17:53:31 +10001108 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +10001109
1110 debug3("%s", __func__);
1111 sshpam_authok = NULL;
1112 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
1113 if (ret == 0 && num == 0)
1114 sshpam_authok = sshpam_ctxt;
1115 if (num > 1 || name == NULL || info == NULL)
1116 ret = -1;
1117 buffer_clear(m);
1118 buffer_put_int(m, ret);
1119 buffer_put_cstring(m, name);
Darren Tuckerf60845f2013-06-02 08:07:31 +10001120 free(name);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001121 buffer_put_cstring(m, info);
Darren Tuckerf60845f2013-06-02 08:07:31 +10001122 free(info);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001123 buffer_put_int(m, num);
1124 for (i = 0; i < num; ++i) {
1125 buffer_put_cstring(m, prompts[i]);
Darren Tuckerf60845f2013-06-02 08:07:31 +10001126 free(prompts[i]);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001127 buffer_put_int(m, echo_on[i]);
1128 }
Darren Tuckerf60845f2013-06-02 08:07:31 +10001129 free(prompts);
1130 free(echo_on);
Damien Miller15b05cf2012-12-03 09:53:20 +11001131 auth_method = "keyboard-interactive";
1132 auth_submethod = "pam";
Darren Tucker7eda5922004-06-22 13:22:50 +10001133 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001134 return (0);
1135}
1136
1137int
Darren Tucker7eda5922004-06-22 13:22:50 +10001138mm_answer_pam_respond(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +10001139{
1140 char **resp;
Damien Miller04b65332005-07-17 17:53:31 +10001141 u_int i, num;
1142 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +10001143
1144 debug3("%s", __func__);
1145 sshpam_authok = NULL;
1146 num = buffer_get_int(m);
1147 if (num > 0) {
Darren Tuckerd8093e42006-05-04 16:24:34 +10001148 resp = xcalloc(num, sizeof(char *));
Damien Miller4f9f42a2003-05-10 19:28:02 +10001149 for (i = 0; i < num; ++i)
1150 resp[i] = buffer_get_string(m, NULL);
1151 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
1152 for (i = 0; i < num; ++i)
Darren Tuckerf60845f2013-06-02 08:07:31 +10001153 free(resp[i]);
1154 free(resp);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001155 } else {
1156 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
1157 }
1158 buffer_clear(m);
1159 buffer_put_int(m, ret);
Darren Tucker7eda5922004-06-22 13:22:50 +10001160 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
Damien Miller15b05cf2012-12-03 09:53:20 +11001161 auth_method = "keyboard-interactive";
1162 auth_submethod = "pam";
Damien Miller4f9f42a2003-05-10 19:28:02 +10001163 if (ret == 0)
1164 sshpam_authok = sshpam_ctxt;
1165 return (0);
1166}
1167
1168int
Darren Tucker7eda5922004-06-22 13:22:50 +10001169mm_answer_pam_free_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +10001170{
1171
1172 debug3("%s", __func__);
1173 (sshpam_device.free_ctx)(sshpam_ctxt);
1174 buffer_clear(m);
Darren Tucker7eda5922004-06-22 13:22:50 +10001175 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
Damien Miller15b05cf2012-12-03 09:53:20 +11001176 auth_method = "keyboard-interactive";
1177 auth_submethod = "pam";
Damien Miller4f9f42a2003-05-10 19:28:02 +10001178 return (sshpam_authok == sshpam_ctxt);
1179}
Damien Miller79418552002-04-23 20:28:48 +10001180#endif
1181
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001182int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001183mm_answer_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001184{
1185 Key *key;
Damien Millera10f5612002-09-12 09:49:15 +10001186 char *cuser, *chost;
1187 u_char *blob;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001188 u_int bloblen;
1189 enum mm_keytype type = 0;
1190 int allowed = 0;
1191
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001192 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001193
1194 type = buffer_get_int(m);
1195 cuser = buffer_get_string(m, NULL);
1196 chost = buffer_get_string(m, NULL);
1197 blob = buffer_get_string(m, &bloblen);
1198
1199 key = key_from_blob(blob, bloblen);
1200
1201 if ((compat20 && type == MM_RSAHOSTKEY) ||
1202 (!compat20 && type != MM_RSAHOSTKEY))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001203 fatal("%s: key type and protocol mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001204
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001205 debug3("%s: key_from_blob: %p", __func__, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001206
Damien Miller3e3b5142003-11-17 21:13:40 +11001207 if (key != NULL && authctxt->valid) {
djm@openbsd.org1f729f02015-01-13 07:39:19 +00001208 /* These should not make it past the privsep child */
1209 if (key_type_plain(key->type) == KEY_RSA &&
1210 (datafellows & SSH_BUG_RSASIGMD5) != 0)
1211 fatal("%s: passed a SSH_BUG_RSASIGMD5 key", __func__);
1212
Darren Tucker47eede72005-03-14 23:08:12 +11001213 switch (type) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001214 case MM_USERKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001215 allowed = options.pubkey_authentication &&
djm@openbsd.orgf69b69b2014-12-22 07:51:30 +00001216 !auth2_userkey_already_used(authctxt, key) &&
djm@openbsd.org1f729f02015-01-13 07:39:19 +00001217 match_pattern_list(sshkey_ssh_name(key),
1218 options.pubkey_key_types,
1219 strlen(options.pubkey_key_types), 0) == 1 &&
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001220 user_key_allowed(authctxt->pw, key);
Damien Miller20bdcd72013-07-18 16:10:09 +10001221 pubkey_auth_info(authctxt, key, NULL);
Damien Miller7a8f5b32006-03-31 23:14:23 +11001222 auth_method = "publickey";
Darren Tuckerf2c16d32008-06-14 08:59:49 +10001223 if (options.pubkey_authentication && allowed != 1)
1224 auth_clear_options();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001225 break;
1226 case MM_HOSTKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001227 allowed = options.hostbased_authentication &&
djm@openbsd.org1f729f02015-01-13 07:39:19 +00001228 match_pattern_list(sshkey_ssh_name(key),
1229 options.hostbased_key_types,
1230 strlen(options.hostbased_key_types), 0) == 1 &&
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001231 hostbased_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001232 cuser, chost, key);
Damien Miller20bdcd72013-07-18 16:10:09 +10001233 pubkey_auth_info(authctxt, key,
1234 "client user \"%.100s\", client host \"%.100s\"",
1235 cuser, chost);
Damien Miller7a8f5b32006-03-31 23:14:23 +11001236 auth_method = "hostbased";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001237 break;
Damien Miller1f0311c2014-05-15 14:24:09 +10001238#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001239 case MM_RSAHOSTKEY:
1240 key->type = KEY_RSA1; /* XXX */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001241 allowed = options.rhosts_rsa_authentication &&
1242 auth_rhosts_rsa_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001243 cuser, chost, key);
Darren Tuckerf2c16d32008-06-14 08:59:49 +10001244 if (options.rhosts_rsa_authentication && allowed != 1)
1245 auth_clear_options();
Damien Miller7a8f5b32006-03-31 23:14:23 +11001246 auth_method = "rsa";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001247 break;
Damien Miller1f0311c2014-05-15 14:24:09 +10001248#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001249 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001250 fatal("%s: unknown key type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001251 break;
1252 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001253 }
Damien Miller00111382003-03-10 11:21:17 +11001254 if (key != NULL)
1255 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001256
1257 /* clear temporarily storage (used by verify) */
1258 monitor_reset_key_state();
1259
1260 if (allowed) {
1261 /* Save temporarily for comparison in verify */
1262 key_blob = blob;
1263 key_bloblen = bloblen;
1264 key_blobtype = type;
1265 hostbased_cuser = cuser;
1266 hostbased_chost = chost;
Damien Miller96937bd2006-03-26 14:01:54 +11001267 } else {
Damien Miller7a8f5b32006-03-31 23:14:23 +11001268 /* Log failed attempt */
Darren Tucker0acca372013-06-02 07:41:51 +10001269 auth_log(authctxt, 0, 0, auth_method, NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001270 free(blob);
1271 free(cuser);
1272 free(chost);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001273 }
1274
1275 debug3("%s: key %p is %s",
Darren Tucker2784f1f2008-07-04 13:51:45 +10001276 __func__, key, allowed ? "allowed" : "not allowed");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001277
1278 buffer_clear(m);
1279 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001280 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001281
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001282 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001283
1284 if (type == MM_RSAHOSTKEY)
1285 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1286
1287 return (0);
1288}
1289
1290static int
1291monitor_valid_userblob(u_char *data, u_int datalen)
1292{
1293 Buffer b;
Damien Miller4ce189d2013-04-23 15:17:52 +10001294 char *p, *userstyle;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001295 u_int len;
1296 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001297
1298 buffer_init(&b);
1299 buffer_append(&b, data, datalen);
1300
1301 if (datafellows & SSH_OLD_SESSIONID) {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001302 p = buffer_ptr(&b);
1303 len = buffer_len(&b);
1304 if ((session_id2 == NULL) ||
1305 (len < session_id2_len) ||
Damien Millerea1651c2010-07-16 13:58:37 +10001306 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstromf67e0772002-06-06 20:58:19 +00001307 fail++;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001308 buffer_consume(&b, session_id2_len);
1309 } else {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001310 p = buffer_get_string(&b, &len);
1311 if ((session_id2 == NULL) ||
1312 (len != session_id2_len) ||
Damien Millerea1651c2010-07-16 13:58:37 +10001313 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001314 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001315 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001316 }
1317 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1318 fail++;
Damien Miller4ce189d2013-04-23 15:17:52 +10001319 p = buffer_get_cstring(&b, NULL);
1320 xasprintf(&userstyle, "%s%s%s", authctxt->user,
1321 authctxt->style ? ":" : "",
1322 authctxt->style ? authctxt->style : "");
1323 if (strcmp(userstyle, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001324 logit("wrong user name passed to monitor: expected %s != %.100s",
Damien Miller4ce189d2013-04-23 15:17:52 +10001325 userstyle, p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001326 fail++;
1327 }
Darren Tuckera627d422013-06-02 07:31:17 +10001328 free(userstyle);
1329 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001330 buffer_skip_string(&b);
1331 if (datafellows & SSH_BUG_PKAUTH) {
1332 if (!buffer_get_char(&b))
1333 fail++;
1334 } else {
Damien Miller4ce189d2013-04-23 15:17:52 +10001335 p = buffer_get_cstring(&b, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001336 if (strcmp("publickey", p) != 0)
1337 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001338 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001339 if (!buffer_get_char(&b))
1340 fail++;
1341 buffer_skip_string(&b);
1342 }
1343 buffer_skip_string(&b);
1344 if (buffer_len(&b) != 0)
1345 fail++;
1346 buffer_free(&b);
1347 return (fail == 0);
1348}
1349
1350static int
Damien Millera10f5612002-09-12 09:49:15 +10001351monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1352 char *chost)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001353{
1354 Buffer b;
Damien Miller4ce189d2013-04-23 15:17:52 +10001355 char *p, *userstyle;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001356 u_int len;
1357 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001358
1359 buffer_init(&b);
1360 buffer_append(&b, data, datalen);
1361
Ben Lindstromf67e0772002-06-06 20:58:19 +00001362 p = buffer_get_string(&b, &len);
1363 if ((session_id2 == NULL) ||
1364 (len != session_id2_len) ||
Damien Millerea1651c2010-07-16 13:58:37 +10001365 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001366 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001367 free(p);
Ben Lindstromf67e0772002-06-06 20:58:19 +00001368
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001369 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1370 fail++;
Damien Miller4ce189d2013-04-23 15:17:52 +10001371 p = buffer_get_cstring(&b, NULL);
1372 xasprintf(&userstyle, "%s%s%s", authctxt->user,
1373 authctxt->style ? ":" : "",
1374 authctxt->style ? authctxt->style : "");
1375 if (strcmp(userstyle, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001376 logit("wrong user name passed to monitor: expected %s != %.100s",
Damien Miller4ce189d2013-04-23 15:17:52 +10001377 userstyle, p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001378 fail++;
1379 }
Damien Miller4ce189d2013-04-23 15:17:52 +10001380 free(userstyle);
Darren Tuckera627d422013-06-02 07:31:17 +10001381 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001382 buffer_skip_string(&b); /* service */
Damien Miller4ce189d2013-04-23 15:17:52 +10001383 p = buffer_get_cstring(&b, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001384 if (strcmp(p, "hostbased") != 0)
1385 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001386 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001387 buffer_skip_string(&b); /* pkalg */
1388 buffer_skip_string(&b); /* pkblob */
1389
1390 /* verify client host, strip trailing dot if necessary */
1391 p = buffer_get_string(&b, NULL);
1392 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1393 p[len - 1] = '\0';
1394 if (strcmp(p, chost) != 0)
1395 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001396 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001397
1398 /* verify client user */
1399 p = buffer_get_string(&b, NULL);
1400 if (strcmp(p, cuser) != 0)
1401 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001402 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001403
1404 if (buffer_len(&b) != 0)
1405 fail++;
1406 buffer_free(&b);
1407 return (fail == 0);
1408}
1409
1410int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001411mm_answer_keyverify(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001412{
1413 Key *key;
1414 u_char *signature, *data, *blob;
1415 u_int signaturelen, datalen, bloblen;
1416 int verified = 0;
1417 int valid_data = 0;
1418
1419 blob = buffer_get_string(m, &bloblen);
1420 signature = buffer_get_string(m, &signaturelen);
1421 data = buffer_get_string(m, &datalen);
1422
1423 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
Ben Lindstromb57a4bf2002-03-27 18:00:59 +00001424 !monitor_allowed_key(blob, bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001425 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001426
1427 key = key_from_blob(blob, bloblen);
1428 if (key == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001429 fatal("%s: bad public key blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001430
1431 switch (key_blobtype) {
1432 case MM_USERKEY:
1433 valid_data = monitor_valid_userblob(data, datalen);
1434 break;
1435 case MM_HOSTKEY:
1436 valid_data = monitor_valid_hostbasedblob(data, datalen,
1437 hostbased_cuser, hostbased_chost);
1438 break;
1439 default:
1440 valid_data = 0;
1441 break;
1442 }
1443 if (!valid_data)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001444 fatal("%s: bad signature data blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001445
1446 verified = key_verify(key, signature, signaturelen, data, datalen);
1447 debug3("%s: key %p signature %s",
Darren Tuckerfbba7352006-11-07 23:16:08 +11001448 __func__, key, (verified == 1) ? "verified" : "unverified");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001449
djm@openbsd.orgf69b69b2014-12-22 07:51:30 +00001450 /* If auth was successful then record key to ensure it isn't reused */
1451 if (verified == 1)
1452 auth2_record_userkey(authctxt, key);
1453 else
1454 key_free(key);
1455
Darren Tuckera627d422013-06-02 07:31:17 +10001456 free(blob);
1457 free(signature);
1458 free(data);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001459
Ben Lindstrome1c09122002-06-23 00:38:24 +00001460 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1461
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001462 monitor_reset_key_state();
1463
1464 buffer_clear(m);
1465 buffer_put_int(m, verified);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001466 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001467
Darren Tuckerfbba7352006-11-07 23:16:08 +11001468 return (verified == 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001469}
1470
1471static void
1472mm_record_login(Session *s, struct passwd *pw)
1473{
1474 socklen_t fromlen;
1475 struct sockaddr_storage from;
1476
1477 /*
1478 * Get IP address of client. If the connection is not a socket, let
1479 * the address be 0.0.0.0.
1480 */
1481 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +10001482 fromlen = sizeof(from);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001483 if (packet_connection_is_on_socket()) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001484 if (getpeername(packet_get_connection_in(),
Damien Miller9f3bd532006-03-26 14:07:52 +11001485 (struct sockaddr *)&from, &fromlen) < 0) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001486 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +10001487 cleanup_exit(255);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001488 }
1489 }
1490 /* Record that there was a login on that tty from the remote host. */
1491 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
Damien Miller3a961dc2003-06-03 10:25:48 +10001492 get_remote_name_or_ip(utmp_len, options.use_dns),
Damien Millerebc23062002-09-04 16:45:09 +10001493 (struct sockaddr *)&from, fromlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001494}
1495
1496static void
1497mm_session_close(Session *s)
1498{
Damien Miller04bd8b02003-05-25 14:38:33 +10001499 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001500 if (s->ttyfd != -1) {
Damien Miller9ab00b42006-08-05 12:40:11 +10001501 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001502 session_pty_cleanup2(s);
1503 }
Damien Miller7207f642008-05-19 15:34:50 +10001504 session_unused(s->self);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001505}
1506
1507int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001508mm_answer_pty(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001509{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001510 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001511 Session *s;
1512 int res, fd0;
1513
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001514 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001515
1516 buffer_clear(m);
1517 s = session_new();
1518 if (s == NULL)
1519 goto error;
1520 s->authctxt = authctxt;
1521 s->pw = authctxt->pw;
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001522 s->pid = pmonitor->m_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001523 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1524 if (res == 0)
1525 goto error;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001526 pty_setowner(authctxt->pw, s->tty);
1527
1528 buffer_put_int(m, 1);
1529 buffer_put_cstring(m, s->tty);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001530
1531 /* We need to trick ttyslot */
1532 if (dup2(s->ttyfd, 0) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001533 fatal("%s: dup2", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001534
1535 mm_record_login(s, authctxt->pw);
1536
1537 /* Now we can close the file descriptor again */
1538 close(0);
1539
Darren Tucker09991742004-07-17 17:05:14 +10001540 /* send messages generated by record_login */
1541 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1542 buffer_clear(&loginmsg);
1543
1544 mm_request_send(sock, MONITOR_ANS_PTY, m);
1545
Damien Miller54fd7cf2007-09-17 12:04:08 +10001546 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1547 mm_send_fd(sock, s->ttyfd) == -1)
1548 fatal("%s: send fds failed", __func__);
Darren Tucker09991742004-07-17 17:05:14 +10001549
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001550 /* make sure nothing uses fd 0 */
1551 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001552 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001553 if (fd0 != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001554 error("%s: fd0 %d != 0", __func__, fd0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001555
1556 /* slave is not needed */
1557 close(s->ttyfd);
1558 s->ttyfd = s->ptyfd;
1559 /* no need to dup() because nobody closes ptyfd */
1560 s->ptymaster = s->ptyfd;
1561
Damien Miller9ab00b42006-08-05 12:40:11 +10001562 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001563
1564 return (0);
1565
1566 error:
1567 if (s != NULL)
1568 mm_session_close(s);
1569 buffer_put_int(m, 0);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001570 mm_request_send(sock, MONITOR_ANS_PTY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001571 return (0);
1572}
1573
1574int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001575mm_answer_pty_cleanup(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001576{
1577 Session *s;
1578 char *tty;
1579
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001580 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001581
1582 tty = buffer_get_string(m, NULL);
1583 if ((s = session_by_tty(tty)) != NULL)
1584 mm_session_close(s);
1585 buffer_clear(m);
Darren Tuckera627d422013-06-02 07:31:17 +10001586 free(tty);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001587 return (0);
1588}
1589
Damien Miller1f0311c2014-05-15 14:24:09 +10001590#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001591int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001592mm_answer_sesskey(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001593{
1594 BIGNUM *p;
1595 int rsafail;
1596
1597 /* Turn off permissions */
Darren Tucker5b530262005-02-09 09:52:17 +11001598 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001599
1600 if ((p = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001601 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001602
1603 buffer_get_bignum2(m, p);
1604
1605 rsafail = ssh1_session_key(p);
1606
1607 buffer_clear(m);
1608 buffer_put_int(m, rsafail);
1609 buffer_put_bignum2(m, p);
1610
1611 BN_clear_free(p);
1612
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001613 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001614
1615 /* Turn on permissions for sessid passing */
1616 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1617
1618 return (0);
1619}
1620
1621int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001622mm_answer_sessid(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001623{
1624 int i;
1625
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001626 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001627
1628 if (buffer_len(m) != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001629 fatal("%s: bad ssh1 session id", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001630 for (i = 0; i < 16; i++)
1631 session_id[i] = buffer_get_char(m);
1632
1633 /* Turn on permissions for getpwnam */
1634 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1635
1636 return (0);
1637}
1638
1639int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001640mm_answer_rsa_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001641{
1642 BIGNUM *client_n;
1643 Key *key = NULL;
1644 u_char *blob = NULL;
1645 u_int blen = 0;
1646 int allowed = 0;
1647
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001648 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001649
Damien Miller7a8f5b32006-03-31 23:14:23 +11001650 auth_method = "rsa";
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001651 if (options.rsa_authentication && authctxt->valid) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001652 if ((client_n = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001653 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001654 buffer_get_bignum2(m, client_n);
1655 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1656 BN_clear_free(client_n);
1657 }
1658 buffer_clear(m);
1659 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001660 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001661
1662 /* clear temporarily storage (used by generate challenge) */
1663 monitor_reset_key_state();
1664
1665 if (allowed && key != NULL) {
1666 key->type = KEY_RSA; /* cheat for key_to_blob */
1667 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001668 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001669 buffer_put_string(m, blob, blen);
1670
1671 /* Save temporarily for comparison in verify */
1672 key_blob = blob;
1673 key_bloblen = blen;
1674 key_blobtype = MM_RSAUSERKEY;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001675 }
Damien Miller00111382003-03-10 11:21:17 +11001676 if (key != NULL)
1677 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001678
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001679 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001680
1681 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1682 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1683 return (0);
1684}
1685
1686int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001687mm_answer_rsa_challenge(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001688{
1689 Key *key = NULL;
1690 u_char *blob;
1691 u_int blen;
1692
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001693 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001694
1695 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001696 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001697 blob = buffer_get_string(m, &blen);
1698 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001699 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001700 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001701 fatal("%s: key type mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001702 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001703 fatal("%s: received bad key", __func__);
Damien Miller923e8bb2009-02-14 16:33:31 +11001704 if (key->type != KEY_RSA)
1705 fatal("%s: received bad key type %d", __func__, key->type);
1706 key->type = KEY_RSA1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001707 if (ssh1_challenge)
1708 BN_clear_free(ssh1_challenge);
1709 ssh1_challenge = auth_rsa_generate_challenge(key);
1710
1711 buffer_clear(m);
1712 buffer_put_bignum2(m, ssh1_challenge);
1713
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001714 debug3("%s sending reply", __func__);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001715 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001716
1717 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
Damien Miller00111382003-03-10 11:21:17 +11001718
Darren Tuckera627d422013-06-02 07:31:17 +10001719 free(blob);
Damien Miller00111382003-03-10 11:21:17 +11001720 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001721 return (0);
1722}
1723
1724int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001725mm_answer_rsa_response(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001726{
1727 Key *key = NULL;
1728 u_char *blob, *response;
1729 u_int blen, len;
1730 int success;
1731
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001732 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001733
1734 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001735 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001736 if (ssh1_challenge == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001737 fatal("%s: no ssh1_challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001738
1739 blob = buffer_get_string(m, &blen);
1740 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001741 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001742 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001743 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001744 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001745 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001746 response = buffer_get_string(m, &len);
1747 if (len != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001748 fatal("%s: received bad response to challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001749 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1750
Darren Tuckera627d422013-06-02 07:31:17 +10001751 free(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001752 key_free(key);
Darren Tuckera627d422013-06-02 07:31:17 +10001753 free(response);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001754
1755 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1756
1757 /* reset state */
1758 BN_clear_free(ssh1_challenge);
1759 ssh1_challenge = NULL;
1760 monitor_reset_key_state();
1761
1762 buffer_clear(m);
1763 buffer_put_int(m, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001764 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001765
1766 return (success);
1767}
Damien Miller1f0311c2014-05-15 14:24:09 +10001768#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001769
1770int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001771mm_answer_term(int sock, Buffer *req)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001772{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001773 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001774 int res, status;
1775
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001776 debug3("%s: tearing down sessions", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001777
1778 /* The child is terminating */
1779 session_destroy_all(&mm_session_close);
1780
Darren Tucker52358d62008-03-11 22:58:25 +11001781#ifdef USE_PAM
1782 if (options.use_pam)
1783 sshpam_cleanup();
1784#endif
1785
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001786 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
Ben Lindstrom47fd8112002-04-02 20:48:19 +00001787 if (errno != EINTR)
1788 exit(1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001789
1790 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1791
1792 /* Terminate process */
Darren Tucker1f8311c2004-05-13 16:39:33 +10001793 exit(res);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001794}
1795
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001796#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +11001797/* Report that an audit event occurred */
1798int
1799mm_answer_audit_event(int socket, Buffer *m)
1800{
1801 ssh_audit_event_t event;
1802
1803 debug3("%s entering", __func__);
1804
1805 event = buffer_get_int(m);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001806 switch(event) {
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001807 case SSH_AUTH_FAIL_PUBKEY:
1808 case SSH_AUTH_FAIL_HOSTBASED:
1809 case SSH_AUTH_FAIL_GSSAPI:
1810 case SSH_LOGIN_EXCEED_MAXTRIES:
1811 case SSH_LOGIN_ROOT_DENIED:
1812 case SSH_CONNECTION_CLOSE:
1813 case SSH_INVALID_USER:
Darren Tucker269a1ea2005-02-03 00:20:53 +11001814 audit_event(event);
1815 break;
1816 default:
1817 fatal("Audit event type %d not permitted", event);
1818 }
1819
1820 return (0);
1821}
1822
1823int
1824mm_answer_audit_command(int socket, Buffer *m)
1825{
1826 u_int len;
1827 char *cmd;
1828
1829 debug3("%s entering", __func__);
1830 cmd = buffer_get_string(m, &len);
1831 /* sanity check command, if so how? */
1832 audit_run_command(cmd);
Darren Tuckerf60845f2013-06-02 08:07:31 +10001833 free(cmd);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001834 return (0);
1835}
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001836#endif /* SSH_AUDIT_EVENTS */
Darren Tucker269a1ea2005-02-03 00:20:53 +11001837
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001838void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001839monitor_apply_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001840{
markus@openbsd.org091c3022015-01-19 19:52:16 +00001841 struct ssh *ssh = active_state; /* XXX */
1842 struct kex *kex;
1843 int r;
1844
1845 debug3("%s: packet_set_state", __func__);
1846 if ((r = ssh_packet_set_state(ssh, child_state)) != 0)
1847 fatal("%s: packet_set_state: %s", __func__, ssh_err(r));
1848 sshbuf_free(child_state);
1849 child_state = NULL;
1850
1851 if ((kex = ssh->kex) != 0) {
1852 /* XXX set callbacks */
Damien Miller773dda22015-01-30 23:10:17 +11001853#ifdef WITH_OPENSSL
markus@openbsd.org091c3022015-01-19 19:52:16 +00001854 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1855 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1856 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1857 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
Darren Tuckerf2004cd2015-02-23 05:04:21 +11001858# ifdef OPENSSL_HAS_ECC
markus@openbsd.org091c3022015-01-19 19:52:16 +00001859 kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
Darren Tuckerf2004cd2015-02-23 05:04:21 +11001860# endif
Damien Miller773dda22015-01-30 23:10:17 +11001861#endif /* WITH_OPENSSL */
markus@openbsd.org091c3022015-01-19 19:52:16 +00001862 kex->kex[KEX_C25519_SHA256] = kexc25519_server;
1863 kex->load_host_public_key=&get_hostkey_public_by_type;
1864 kex->load_host_private_key=&get_hostkey_private_by_type;
1865 kex->host_key_index=&get_hostkey_index;
1866 kex->sign = sshd_hostkey_sign;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001867 }
1868
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001869 /* Update with new address */
markus@openbsd.org091c3022015-01-19 19:52:16 +00001870 if (options.compression) {
1871 ssh_packet_set_compress_hooks(ssh, pmonitor->m_zlib,
1872 (ssh_packet_comp_alloc_func *)mm_zalloc,
1873 (ssh_packet_comp_free_func *)mm_zfree);
1874 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001875}
1876
1877/* This function requries careful sanity checking */
1878
1879void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001880mm_get_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001881{
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001882 debug3("%s: Waiting for new keys", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001883
markus@openbsd.org091c3022015-01-19 19:52:16 +00001884 if ((child_state = sshbuf_new()) == NULL)
1885 fatal("%s: sshbuf_new failed", __func__);
1886 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT,
1887 child_state);
1888 debug3("%s: GOT new keys", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001889}
1890
1891
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001892/* XXX */
1893
1894#define FD_CLOSEONEXEC(x) do { \
Damien Miller814ace02011-05-20 19:02:47 +10001895 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001896 fatal("fcntl(%d, F_SETFD)", x); \
1897} while (0)
1898
1899static void
Damien Miller8f0bf232011-06-20 14:42:23 +10001900monitor_openfds(struct monitor *mon, int do_logfds)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001901{
Damien Miller8f0bf232011-06-20 14:42:23 +10001902 int pair[2];
1903
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001904 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
Damien Miller8f0bf232011-06-20 14:42:23 +10001905 fatal("%s: socketpair: %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001906 FD_CLOSEONEXEC(pair[0]);
1907 FD_CLOSEONEXEC(pair[1]);
Damien Miller8f0bf232011-06-20 14:42:23 +10001908 mon->m_recvfd = pair[0];
1909 mon->m_sendfd = pair[1];
1910
1911 if (do_logfds) {
1912 if (pipe(pair) == -1)
1913 fatal("%s: pipe: %s", __func__, strerror(errno));
1914 FD_CLOSEONEXEC(pair[0]);
1915 FD_CLOSEONEXEC(pair[1]);
1916 mon->m_log_recvfd = pair[0];
1917 mon->m_log_sendfd = pair[1];
1918 } else
1919 mon->m_log_recvfd = mon->m_log_sendfd = -1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001920}
1921
1922#define MM_MEMSIZE 65536
1923
1924struct monitor *
1925monitor_init(void)
1926{
markus@openbsd.org091c3022015-01-19 19:52:16 +00001927 struct ssh *ssh = active_state; /* XXX */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001928 struct monitor *mon;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001929
Damien Miller07d86be2006-03-26 14:19:21 +11001930 mon = xcalloc(1, sizeof(*mon));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001931
Damien Miller8f0bf232011-06-20 14:42:23 +10001932 monitor_openfds(mon, 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001933
1934 /* Used to share zlib space across processes */
Damien Miller2d6b8332002-06-21 15:59:49 +10001935 if (options.compression) {
1936 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1937 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001938
Damien Miller2d6b8332002-06-21 15:59:49 +10001939 /* Compression needs to share state across borders */
markus@openbsd.org091c3022015-01-19 19:52:16 +00001940 ssh_packet_set_compress_hooks(ssh, mon->m_zlib,
1941 (ssh_packet_comp_alloc_func *)mm_zalloc,
1942 (ssh_packet_comp_free_func *)mm_zfree);
Damien Miller2d6b8332002-06-21 15:59:49 +10001943 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001944
1945 return mon;
1946}
1947
1948void
1949monitor_reinit(struct monitor *mon)
1950{
Damien Miller8f0bf232011-06-20 14:42:23 +10001951 monitor_openfds(mon, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001952}
Darren Tucker0efd1552003-08-26 11:49:55 +10001953
1954#ifdef GSSAPI
1955int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001956mm_answer_gss_setup_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001957{
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001958 gss_OID_desc goid;
Darren Tucker0efd1552003-08-26 11:49:55 +10001959 OM_uint32 major;
1960 u_int len;
1961
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001962 goid.elements = buffer_get_string(m, &len);
1963 goid.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001964
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001965 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
Darren Tucker0efd1552003-08-26 11:49:55 +10001966
Darren Tuckera627d422013-06-02 07:31:17 +10001967 free(goid.elements);
Darren Tucker0efd1552003-08-26 11:49:55 +10001968
1969 buffer_clear(m);
1970 buffer_put_int(m, major);
1971
Damien Miller6fd6def2005-11-05 15:07:05 +11001972 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001973
1974 /* Now we have a context, enable the step */
1975 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1976
1977 return (0);
1978}
1979
1980int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001981mm_answer_gss_accept_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001982{
1983 gss_buffer_desc in;
1984 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
Damien Miller6fd6def2005-11-05 15:07:05 +11001985 OM_uint32 major, minor;
Darren Tucker0efd1552003-08-26 11:49:55 +10001986 OM_uint32 flags = 0; /* GSI needs this */
Darren Tucker600ad8d2003-08-26 12:10:48 +10001987 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001988
Darren Tucker600ad8d2003-08-26 12:10:48 +10001989 in.value = buffer_get_string(m, &len);
1990 in.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001991 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
Darren Tuckera627d422013-06-02 07:31:17 +10001992 free(in.value);
Darren Tucker0efd1552003-08-26 11:49:55 +10001993
1994 buffer_clear(m);
1995 buffer_put_int(m, major);
1996 buffer_put_string(m, out.value, out.length);
1997 buffer_put_int(m, flags);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001998 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001999
2000 gss_release_buffer(&minor, &out);
2001
Damien Miller6fd6def2005-11-05 15:07:05 +11002002 if (major == GSS_S_COMPLETE) {
Darren Tucker0efd1552003-08-26 11:49:55 +10002003 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
2004 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller0425d402003-11-17 22:18:21 +11002005 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
Darren Tucker0efd1552003-08-26 11:49:55 +10002006 }
2007 return (0);
2008}
2009
2010int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002011mm_answer_gss_checkmic(int sock, Buffer *m)
Damien Miller0425d402003-11-17 22:18:21 +11002012{
2013 gss_buffer_desc gssbuf, mic;
2014 OM_uint32 ret;
2015 u_int len;
Damien Miller787b2ec2003-11-21 23:56:47 +11002016
Damien Miller0425d402003-11-17 22:18:21 +11002017 gssbuf.value = buffer_get_string(m, &len);
2018 gssbuf.length = len;
2019 mic.value = buffer_get_string(m, &len);
2020 mic.length = len;
Damien Miller787b2ec2003-11-21 23:56:47 +11002021
Damien Miller0425d402003-11-17 22:18:21 +11002022 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +11002023
Darren Tuckera627d422013-06-02 07:31:17 +10002024 free(gssbuf.value);
2025 free(mic.value);
Damien Miller787b2ec2003-11-21 23:56:47 +11002026
Damien Miller0425d402003-11-17 22:18:21 +11002027 buffer_clear(m);
2028 buffer_put_int(m, ret);
Damien Miller787b2ec2003-11-21 23:56:47 +11002029
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002030 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
Damien Miller787b2ec2003-11-21 23:56:47 +11002031
Damien Miller0425d402003-11-17 22:18:21 +11002032 if (!GSS_ERROR(ret))
2033 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller787b2ec2003-11-21 23:56:47 +11002034
Damien Miller0425d402003-11-17 22:18:21 +11002035 return (0);
2036}
2037
2038int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002039mm_answer_gss_userok(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10002040{
2041 int authenticated;
2042
2043 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
2044
2045 buffer_clear(m);
2046 buffer_put_int(m, authenticated);
2047
2048 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002049 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10002050
Damien Miller6fd6def2005-11-05 15:07:05 +11002051 auth_method = "gssapi-with-mic";
Darren Tucker0efd1552003-08-26 11:49:55 +10002052
2053 /* Monitor loop will terminate if authenticated */
2054 return (authenticated);
2055}
2056#endif /* GSSAPI */
Damien Miller01ed2272008-11-05 16:20:46 +11002057