blob: dbe29f128dbe644f5da21fe1cc8bef03d82fcccd [file] [log] [blame]
Damien Miller7acefbb2014-07-18 14:11:24 +10001/* $OpenBSD: monitor.c,v 1.135 2014/07/15 15:54:14 millert Exp $ */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002/*
3 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4 * Copyright 2002 Markus Friedl <markus@openbsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "includes.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110029
30#include <sys/types.h>
Damien Miller8dbffe72006-08-05 11:02:17 +100031#include <sys/param.h>
Damien Millere3b60b52006-07-10 21:08:03 +100032#include <sys/socket.h>
Damien Millerd7834352006-08-05 12:39:39 +100033#include "openbsd-compat/sys-tree.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110034#include <sys/wait.h>
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000035
Darren Tucker39972492006-07-12 22:22:46 +100036#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100037#include <fcntl.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110038#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110039#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110040#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100041#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110042#include <signal.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100043#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100044#include <string.h>
Damien Miller86687062014-07-02 15:28:02 +100045#include <stdarg.h>
46#include <stdio.h>
Damien Miller607aede2006-09-01 15:48:19 +100047#include <unistd.h>
Damien Miller8f0bf232011-06-20 14:42:23 +100048#ifdef HAVE_POLL_H
49#include <poll.h>
50#else
51# ifdef HAVE_SYS_POLL_H
52# include <sys/poll.h>
53# endif
54#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000055
56#ifdef SKEY
57#include <skey.h>
58#endif
59
Damien Miller1f0311c2014-05-15 14:24:09 +100060#ifdef WITH_OPENSSL
Damien Miller03e20032006-03-15 11:16:59 +110061#include <openssl/dh.h>
Damien Miller1f0311c2014-05-15 14:24:09 +100062#endif
Damien Miller03e20032006-03-15 11:16:59 +110063
Damien Millerb84886b2008-05-19 15:05:07 +100064#include "openbsd-compat/sys-queue.h"
Damien Miller8f0bf232011-06-20 14:42:23 +100065#include "atomicio.h"
Damien Millerd7834352006-08-05 12:39:39 +100066#include "xmalloc.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000067#include "ssh.h"
Damien Millerd7834352006-08-05 12:39:39 +100068#include "key.h"
69#include "buffer.h"
70#include "hostfile.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000071#include "auth.h"
Damien Millerd7834352006-08-05 12:39:39 +100072#include "cipher.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000073#include "kex.h"
74#include "dh.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000075#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
76#undef TARGET_OS_MAC
Ben Lindstrom1b9f2a62004-04-08 05:11:03 +000077#include "zlib.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000078#define TARGET_OS_MAC 1
79#else
80#include "zlib.h"
81#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000082#include "packet.h"
83#include "auth-options.h"
84#include "sshpty.h"
85#include "channels.h"
86#include "session.h"
87#include "sshlogin.h"
88#include "canohost.h"
89#include "log.h"
Damien Miller7acefbb2014-07-18 14:11:24 +100090#include "misc.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000091#include "servconf.h"
92#include "monitor.h"
93#include "monitor_mm.h"
Damien Millerd7834352006-08-05 12:39:39 +100094#ifdef GSSAPI
95#include "ssh-gss.h"
96#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000097#include "monitor_wrap.h"
98#include "monitor_fdpass.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000099#include "compat.h"
100#include "ssh2.h"
Darren Tuckerb422afa2009-06-21 18:58:46 +1000101#include "roaming.h"
Damien Miller85b45e02013-07-20 13:21:52 +1000102#include "authfd.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000103
Darren Tucker0efd1552003-08-26 11:49:55 +1000104#ifdef GSSAPI
Darren Tucker0efd1552003-08-26 11:49:55 +1000105static Gssctxt *gsscontext = NULL;
106#endif
107
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000108/* Imports */
109extern ServerOptions options;
110extern u_int utmp_len;
111extern Newkeys *current_keys[];
112extern z_stream incoming_stream;
113extern z_stream outgoing_stream;
114extern u_char session_id[];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000115extern Buffer auth_debug;
116extern int auth_debug_init;
Darren Tucker09991742004-07-17 17:05:14 +1000117extern Buffer loginmsg;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000118
119/* State exported from the child */
120
121struct {
122 z_stream incoming;
123 z_stream outgoing;
124 u_char *keyin;
125 u_int keyinlen;
126 u_char *keyout;
127 u_int keyoutlen;
128 u_char *ivin;
129 u_int ivinlen;
130 u_char *ivout;
131 u_int ivoutlen;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000132 u_char *ssh1key;
133 u_int ssh1keylen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000134 int ssh1cipher;
135 int ssh1protoflags;
136 u_char *input;
137 u_int ilen;
138 u_char *output;
139 u_int olen;
Darren Tuckerc5564e12009-06-21 18:53:53 +1000140 u_int64_t sent_bytes;
141 u_int64_t recv_bytes;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000142} child_state;
143
Damien Miller469954d2003-06-18 20:25:33 +1000144/* Functions on the monitor that answer unprivileged requests */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000145
146int mm_answer_moduli(int, Buffer *);
147int mm_answer_sign(int, Buffer *);
148int mm_answer_pwnamallow(int, Buffer *);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000149int mm_answer_auth2_read_banner(int, Buffer *);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000150int mm_answer_authserv(int, Buffer *);
151int mm_answer_authpassword(int, Buffer *);
152int mm_answer_bsdauthquery(int, Buffer *);
153int mm_answer_bsdauthrespond(int, Buffer *);
154int mm_answer_skeyquery(int, Buffer *);
155int mm_answer_skeyrespond(int, Buffer *);
156int mm_answer_keyallowed(int, Buffer *);
157int mm_answer_keyverify(int, Buffer *);
158int mm_answer_pty(int, Buffer *);
159int mm_answer_pty_cleanup(int, Buffer *);
160int mm_answer_term(int, Buffer *);
161int mm_answer_rsa_keyallowed(int, Buffer *);
162int mm_answer_rsa_challenge(int, Buffer *);
163int mm_answer_rsa_response(int, Buffer *);
164int mm_answer_sesskey(int, Buffer *);
165int mm_answer_sessid(int, Buffer *);
166
Damien Miller79418552002-04-23 20:28:48 +1000167#ifdef USE_PAM
168int mm_answer_pam_start(int, Buffer *);
Damien Miller1f499fd2003-08-25 13:08:49 +1000169int mm_answer_pam_account(int, Buffer *);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000170int mm_answer_pam_init_ctx(int, Buffer *);
171int mm_answer_pam_query(int, Buffer *);
172int mm_answer_pam_respond(int, Buffer *);
173int mm_answer_pam_free_ctx(int, Buffer *);
Damien Miller79418552002-04-23 20:28:48 +1000174#endif
175
Darren Tucker0efd1552003-08-26 11:49:55 +1000176#ifdef GSSAPI
177int mm_answer_gss_setup_ctx(int, Buffer *);
178int mm_answer_gss_accept_ctx(int, Buffer *);
179int mm_answer_gss_userok(int, Buffer *);
Damien Miller0425d402003-11-17 22:18:21 +1100180int mm_answer_gss_checkmic(int, Buffer *);
Darren Tucker0efd1552003-08-26 11:49:55 +1000181#endif
Damien Miller25162f22002-09-12 09:47:29 +1000182
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100183#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100184int mm_answer_audit_event(int, Buffer *);
185int mm_answer_audit_command(int, Buffer *);
186#endif
187
Damien Miller8f0bf232011-06-20 14:42:23 +1000188static int monitor_read_log(struct monitor *);
189
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000190static Authctxt *authctxt;
Damien Miller1f0311c2014-05-15 14:24:09 +1000191
192#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000193static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
Damien Miller1f0311c2014-05-15 14:24:09 +1000194#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000195
196/* local state for key verify */
197static u_char *key_blob = NULL;
198static u_int key_bloblen = 0;
199static int key_blobtype = MM_NOKEY;
Damien Millera10f5612002-09-12 09:49:15 +1000200static char *hostbased_cuser = NULL;
201static char *hostbased_chost = NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000202static char *auth_method = "unknown";
Damien Miller15b05cf2012-12-03 09:53:20 +1100203static char *auth_submethod = NULL;
Darren Tucker502d3842003-06-28 12:38:01 +1000204static u_int session_id2_len = 0;
Ben Lindstromf67e0772002-06-06 20:58:19 +0000205static u_char *session_id2 = NULL;
Damien Millerbe64d432003-05-14 19:31:12 +1000206static pid_t monitor_child_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000207
208struct mon_table {
209 enum monitor_reqtype type;
210 int flags;
211 int (*f)(int, Buffer *);
212};
213
214#define MON_ISAUTH 0x0004 /* Required for Authentication */
215#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
216#define MON_ONCE 0x0010 /* Disable after calling */
Damien Miller7a8f5b32006-03-31 23:14:23 +1100217#define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000218
219#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
220
221#define MON_PERMIT 0x1000 /* Request is permitted */
222
223struct mon_table mon_dispatch_proto20[] = {
Damien Miller1f0311c2014-05-15 14:24:09 +1000224#ifdef WITH_OPENSSL
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000225 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
Damien Miller1f0311c2014-05-15 14:24:09 +1000226#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000227 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
228 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
229 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
Damien Miller5ad9fd92002-05-13 11:07:41 +1000230 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000231 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller79418552002-04-23 20:28:48 +1000232#ifdef USE_PAM
233 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000234 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000235 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
236 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
237 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
238 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Kevin Stevesbd1901b2002-04-01 18:04:35 +0000239#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100240#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100241 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100242#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000243#ifdef BSD_AUTH
244 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100245 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000246#endif
247#ifdef SKEY
248 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
249 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
250#endif
251 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
252 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
Darren Tucker0efd1552003-08-26 11:49:55 +1000253#ifdef GSSAPI
254 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
255 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
256 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
Damien Miller0425d402003-11-17 22:18:21 +1100257 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
Darren Tucker0efd1552003-08-26 11:49:55 +1000258#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000259 {0, 0, NULL}
260};
261
262struct mon_table mon_dispatch_postauth20[] = {
Damien Miller1f0311c2014-05-15 14:24:09 +1000263#ifdef WITH_OPENSSL
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000264 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
Damien Miller1f0311c2014-05-15 14:24:09 +1000265#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000266 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
267 {MONITOR_REQ_PTY, 0, mm_answer_pty},
268 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
269 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100270#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100271 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
272 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
273#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000274 {0, 0, NULL}
275};
276
277struct mon_table mon_dispatch_proto15[] = {
Damien Miller1f0311c2014-05-15 14:24:09 +1000278#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000279 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
280 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
281 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
282 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller7a8f5b32006-03-31 23:14:23 +1100283 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
284 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000285 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
286 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
287#ifdef BSD_AUTH
288 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100289 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000290#endif
291#ifdef SKEY
292 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
293 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
294#endif
Damien Millera33501b2002-05-08 12:24:42 +1000295#ifdef USE_PAM
296 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000297 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000298 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
299 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
300 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
301 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Damien Millera33501b2002-05-08 12:24:42 +1000302#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100303#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100304 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100305#endif
Damien Miller1f0311c2014-05-15 14:24:09 +1000306#endif /* WITH_SSH1 */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000307 {0, 0, NULL}
308};
309
310struct mon_table mon_dispatch_postauth15[] = {
Damien Miller1f0311c2014-05-15 14:24:09 +1000311#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000312 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
313 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
314 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100315#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100316 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker5965ae12006-09-17 12:00:13 +1000317 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100318#endif
Damien Miller1f0311c2014-05-15 14:24:09 +1000319#endif /* WITH_SSH1 */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000320 {0, 0, NULL}
321};
322
323struct mon_table *mon_dispatch;
324
325/* Specifies if a certain message is allowed at the moment */
326
327static void
328monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
329{
330 while (ent->f != NULL) {
331 if (ent->type == type) {
332 ent->flags &= ~MON_PERMIT;
333 ent->flags |= permit ? MON_PERMIT : 0;
334 return;
335 }
336 ent++;
337 }
338}
339
340static void
341monitor_permit_authentications(int permit)
342{
343 struct mon_table *ent = mon_dispatch;
344
345 while (ent->f != NULL) {
346 if (ent->flags & MON_AUTH) {
347 ent->flags &= ~MON_PERMIT;
348 ent->flags |= permit ? MON_PERMIT : 0;
349 }
350 ent++;
351 }
352}
353
Darren Tucker3e33cec2003-10-02 16:12:36 +1000354void
355monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000356{
357 struct mon_table *ent;
Damien Miller15b05cf2012-12-03 09:53:20 +1100358 int authenticated = 0, partial = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000359
360 debug3("preauth child monitor started");
361
Damien Miller8f0bf232011-06-20 14:42:23 +1000362 close(pmonitor->m_recvfd);
363 close(pmonitor->m_log_sendfd);
364 pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
365
Darren Tucker3e33cec2003-10-02 16:12:36 +1000366 authctxt = _authctxt;
367 memset(authctxt, 0, sizeof(*authctxt));
368
Darren Tuckerde0de392005-03-31 23:52:04 +1000369 authctxt->loginmsg = &loginmsg;
370
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000371 if (compat20) {
372 mon_dispatch = mon_dispatch_proto20;
373
374 /* Permit requests for moduli and signatures */
375 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
376 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
377 } else {
378 mon_dispatch = mon_dispatch_proto15;
379
380 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
381 }
382
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000383 /* The first few requests do not require asynchronous access */
384 while (!authenticated) {
Damien Miller15b05cf2012-12-03 09:53:20 +1100385 partial = 0;
Damien Miller7a8f5b32006-03-31 23:14:23 +1100386 auth_method = "unknown";
Damien Miller15b05cf2012-12-03 09:53:20 +1100387 auth_submethod = NULL;
Darren Tuckerfbba7352006-11-07 23:16:08 +1100388 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
Damien Millera6e3f012012-11-04 23:21:40 +1100389
390 /* Special handling for multiple required authentications */
391 if (options.num_auth_methods != 0) {
392 if (!compat20)
393 fatal("AuthenticationMethods is not supported"
394 "with SSH protocol 1");
395 if (authenticated &&
396 !auth2_update_methods_lists(authctxt,
Damien Miller91a55f22013-04-23 15:18:10 +1000397 auth_method, auth_submethod)) {
Damien Millera6e3f012012-11-04 23:21:40 +1100398 debug3("%s: method %s: partial", __func__,
399 auth_method);
400 authenticated = 0;
Damien Miller15b05cf2012-12-03 09:53:20 +1100401 partial = 1;
Damien Millera6e3f012012-11-04 23:21:40 +1100402 }
403 }
404
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000405 if (authenticated) {
406 if (!(ent->flags & MON_AUTHDECIDE))
407 fatal("%s: unexpected authentication from %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000408 __func__, ent->type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000409 if (authctxt->pw->pw_uid == 0 &&
410 !auth_root_allowed(auth_method))
411 authenticated = 0;
Damien Miller1f499fd2003-08-25 13:08:49 +1000412#ifdef USE_PAM
413 /* PAM needs to perform account checks after auth */
Damien Miller6aef38f2003-11-18 10:45:20 +1100414 if (options.use_pam && authenticated) {
Damien Miller1f499fd2003-08-25 13:08:49 +1000415 Buffer m;
416
417 buffer_init(&m);
Damien Millera8e06ce2003-11-21 23:48:55 +1100418 mm_request_receive_expect(pmonitor->m_sendfd,
Damien Miller1f499fd2003-08-25 13:08:49 +1000419 MONITOR_REQ_PAM_ACCOUNT, &m);
420 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
421 buffer_free(&m);
422 }
423#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000424 }
Damien Miller7a8f5b32006-03-31 23:14:23 +1100425 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
Damien Miller15b05cf2012-12-03 09:53:20 +1100426 auth_log(authctxt, authenticated, partial,
Darren Tucker0acca372013-06-02 07:41:51 +1000427 auth_method, auth_submethod);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000428 if (!authenticated)
429 authctxt->failures++;
430 }
431 }
432
433 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000434 fatal("%s: authenticated invalid user", __func__);
Damien Miller7a8f5b32006-03-31 23:14:23 +1100435 if (strcmp(auth_method, "unknown") == 0)
436 fatal("%s: authentication method name unknown", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000437
438 debug("%s: %s has been authenticated by privileged process",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000439 __func__, authctxt->user);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000440
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000441 mm_get_keystate(pmonitor);
Damien Miller8f0bf232011-06-20 14:42:23 +1000442
Damien Miller6a1937e2012-12-12 10:44:38 +1100443 /* Drain any buffered messages from the child */
444 while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
445 ;
446
Damien Miller8f0bf232011-06-20 14:42:23 +1000447 close(pmonitor->m_sendfd);
448 close(pmonitor->m_log_recvfd);
449 pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000450}
451
Damien Millerbe64d432003-05-14 19:31:12 +1000452static void
453monitor_set_child_handler(pid_t pid)
454{
455 monitor_child_pid = pid;
456}
457
458static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000459monitor_child_handler(int sig)
Damien Millerbe64d432003-05-14 19:31:12 +1000460{
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000461 kill(monitor_child_pid, sig);
Damien Millerbe64d432003-05-14 19:31:12 +1000462}
463
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000464void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000465monitor_child_postauth(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000466{
Damien Miller8f0bf232011-06-20 14:42:23 +1000467 close(pmonitor->m_recvfd);
468 pmonitor->m_recvfd = -1;
469
Damien Millerbe64d432003-05-14 19:31:12 +1000470 monitor_set_child_handler(pmonitor->m_pid);
471 signal(SIGHUP, &monitor_child_handler);
472 signal(SIGTERM, &monitor_child_handler);
Darren Tucker7fa339b2007-05-20 15:10:16 +1000473 signal(SIGINT, &monitor_child_handler);
Damien Miller146218a2014-08-27 04:11:55 +1000474#ifdef SIGXFSZ
475 signal(SIGXFSZ, SIG_IGN);
476#endif
Damien Millerbe64d432003-05-14 19:31:12 +1000477
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000478 if (compat20) {
479 mon_dispatch = mon_dispatch_postauth20;
480
481 /* Permit requests for moduli and signatures */
482 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
483 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
484 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000485 } else {
486 mon_dispatch = mon_dispatch_postauth15;
487 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
488 }
489 if (!no_pty_flag) {
490 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
491 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
492 }
493
494 for (;;)
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000495 monitor_read(pmonitor, mon_dispatch, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000496}
497
498void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000499monitor_sync(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000500{
Damien Miller2d6b8332002-06-21 15:59:49 +1000501 if (options.compression) {
502 /* The member allocation is not visible, so sync it */
503 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
504 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000505}
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
Damien Miller85b45e02013-07-20 13:21:52 +1000687extern AuthenticationConnection *auth_conn;
688
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000689int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000690mm_answer_sign(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000691{
692 Key *key;
693 u_char *p;
694 u_char *signature;
695 u_int siglen, datlen;
696 int keyid;
697
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000698 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000699
700 keyid = buffer_get_int(m);
701 p = buffer_get_string(m, &datlen);
702
Damien Millera63128d2006-03-15 12:08:28 +1100703 /*
Damien Miller041ab7c2010-09-10 11:23:34 +1000704 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
705 * SHA384 (48 bytes) and SHA512 (64 bytes).
Damien Millera63128d2006-03-15 12:08:28 +1100706 */
Damien Miller041ab7c2010-09-10 11:23:34 +1000707 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64)
Ben Lindstromd5502182002-06-27 00:12:57 +0000708 fatal("%s: data length incorrect: %u", __func__, datlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000709
Ben Lindstromf67e0772002-06-06 20:58:19 +0000710 /* save session id, it will be passed on the first call */
711 if (session_id2_len == 0) {
712 session_id2_len = datlen;
713 session_id2 = xmalloc(session_id2_len);
714 memcpy(session_id2, p, session_id2_len);
715 }
716
Damien Miller85b45e02013-07-20 13:21:52 +1000717 if ((key = get_hostkey_by_index(keyid)) != NULL) {
718 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
719 fatal("%s: key_sign failed", __func__);
720 } else if ((key = get_hostkey_public_by_index(keyid)) != NULL &&
721 auth_conn != NULL) {
722 if (ssh_agent_sign(auth_conn, key, &signature, &siglen, p,
723 datlen) < 0)
724 fatal("%s: ssh_agent_sign failed", __func__);
725 } else
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000726 fatal("%s: no hostkey from index %d", __func__, keyid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000727
Ben Lindstromd5502182002-06-27 00:12:57 +0000728 debug3("%s: signature %p(%u)", __func__, signature, siglen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000729
730 buffer_clear(m);
731 buffer_put_string(m, signature, siglen);
732
Darren Tuckera627d422013-06-02 07:31:17 +1000733 free(p);
734 free(signature);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000735
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000736 mm_request_send(sock, MONITOR_ANS_SIGN, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000737
738 /* Turn on permissions for getpwnam */
739 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
740
741 return (0);
742}
743
744/* Retrieves the password entry and also checks if the user is permitted */
745
746int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000747mm_answer_pwnamallow(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000748{
Darren Tuckerb09b6772004-06-22 15:06:46 +1000749 char *username;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000750 struct passwd *pwent;
751 int allowed = 0;
Damien Millerd8478b62011-05-29 21:39:36 +1000752 u_int i;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000753
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000754 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000755
756 if (authctxt->attempt++ != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000757 fatal("%s: multiple attempts for getpwnam", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000758
Darren Tuckerb09b6772004-06-22 15:06:46 +1000759 username = buffer_get_string(m, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000760
Darren Tuckerb09b6772004-06-22 15:06:46 +1000761 pwent = getpwnamallow(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000762
Darren Tuckerb09b6772004-06-22 15:06:46 +1000763 authctxt->user = xstrdup(username);
764 setproctitle("%s [priv]", pwent ? username : "unknown");
Darren Tuckera627d422013-06-02 07:31:17 +1000765 free(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000766
767 buffer_clear(m);
768
769 if (pwent == NULL) {
770 buffer_put_char(m, 0);
Damien Millerf96d1832003-11-18 22:01:48 +1100771 authctxt->pw = fakepw();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000772 goto out;
773 }
774
775 allowed = 1;
776 authctxt->pw = pwent;
777 authctxt->valid = 1;
778
779 buffer_put_char(m, 1);
780 buffer_put_string(m, pwent, sizeof(struct passwd));
781 buffer_put_cstring(m, pwent->pw_name);
782 buffer_put_cstring(m, "*");
Damien Miller6332da22013-04-23 14:25:52 +1000783#ifdef HAVE_STRUCT_PASSWD_PW_GECOS
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000784 buffer_put_cstring(m, pwent->pw_gecos);
Damien Miller6332da22013-04-23 14:25:52 +1000785#endif
786#ifdef HAVE_STRUCT_PASSWD_PW_CLASS
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000787 buffer_put_cstring(m, pwent->pw_class);
Kevin Steves7e147602002-03-22 18:07:17 +0000788#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000789 buffer_put_cstring(m, pwent->pw_dir);
790 buffer_put_cstring(m, pwent->pw_shell);
Darren Tucker2f8b3d92007-12-02 23:02:15 +1100791
792 out:
Darren Tucker1629c072007-02-19 22:25:37 +1100793 buffer_put_string(m, &options, sizeof(options));
Damien Millerf2e407e2011-05-20 19:04:14 +1000794
795#define M_CP_STROPT(x) do { \
796 if (options.x != NULL) \
797 buffer_put_cstring(m, options.x); \
798 } while (0)
Damien Millerd8478b62011-05-29 21:39:36 +1000799#define M_CP_STRARRAYOPT(x, nx) do { \
800 for (i = 0; i < options.nx; i++) \
801 buffer_put_cstring(m, options.x[i]); \
802 } while (0)
Damien Millerf2e407e2011-05-20 19:04:14 +1000803 /* See comment in servconf.h */
804 COPY_MATCH_STRING_OPTS();
805#undef M_CP_STROPT
Damien Millerd8478b62011-05-29 21:39:36 +1000806#undef M_CP_STRARRAYOPT
Damien Millera6e3f012012-11-04 23:21:40 +1100807
808 /* Create valid auth method lists */
809 if (compat20 && auth2_setup_methods_lists(authctxt) != 0) {
810 /*
811 * The monitor will continue long enough to let the child
812 * run to it's packet_disconnect(), but it must not allow any
813 * authentication to succeed.
814 */
815 debug("%s: no valid authentication method lists", __func__);
816 }
817
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000818 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000819 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000820
821 /* For SSHv1 allow authentication now */
822 if (!compat20)
823 monitor_permit_authentications(1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000824 else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000825 /* Allow service/style information on the auth context */
826 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000827 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
828 }
Damien Millera33501b2002-05-08 12:24:42 +1000829#ifdef USE_PAM
Damien Miller4e448a32003-05-14 15:11:48 +1000830 if (options.use_pam)
831 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
Damien Millera33501b2002-05-08 12:24:42 +1000832#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000833
834 return (0);
835}
836
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000837int mm_answer_auth2_read_banner(int sock, Buffer *m)
Damien Miller5ad9fd92002-05-13 11:07:41 +1000838{
839 char *banner;
840
841 buffer_clear(m);
842 banner = auth2_read_banner();
843 buffer_put_cstring(m, banner != NULL ? banner : "");
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000844 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
Darren Tuckera627d422013-06-02 07:31:17 +1000845 free(banner);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000846
847 return (0);
848}
849
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000850int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000851mm_answer_authserv(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000852{
853 monitor_permit_authentications(1);
854
855 authctxt->service = buffer_get_string(m, NULL);
856 authctxt->style = buffer_get_string(m, NULL);
857 debug3("%s: service=%s, style=%s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000858 __func__, authctxt->service, authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000859
860 if (strlen(authctxt->style) == 0) {
Darren Tuckera627d422013-06-02 07:31:17 +1000861 free(authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000862 authctxt->style = NULL;
863 }
864
865 return (0);
866}
867
868int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000869mm_answer_authpassword(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000870{
871 static int call_count;
872 char *passwd;
Ben Lindstrom7cea16b2002-07-23 21:13:40 +0000873 int authenticated;
874 u_int plen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000875
876 passwd = buffer_get_string(m, &plen);
877 /* Only authenticate if the context is valid */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000878 authenticated = options.password_authentication &&
Damien Miller856f0be2003-09-03 07:32:45 +1000879 auth_password(authctxt, passwd);
Damien Millera5103f42014-02-04 11:20:14 +1100880 explicit_bzero(passwd, strlen(passwd));
Darren Tuckera627d422013-06-02 07:31:17 +1000881 free(passwd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000882
883 buffer_clear(m);
884 buffer_put_int(m, authenticated);
885
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000886 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000887 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000888
889 call_count++;
890 if (plen == 0 && call_count == 1)
891 auth_method = "none";
892 else
893 auth_method = "password";
894
895 /* Causes monitor loop to terminate if authenticated */
896 return (authenticated);
897}
898
899#ifdef BSD_AUTH
900int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000901mm_answer_bsdauthquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000902{
903 char *name, *infotxt;
904 u_int numprompts;
905 u_int *echo_on;
906 char **prompts;
Damien Millerb7df3af2003-02-24 11:55:46 +1100907 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000908
Damien Millerb7df3af2003-02-24 11:55:46 +1100909 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
910 &prompts, &echo_on) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000911
912 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100913 buffer_put_int(m, success);
914 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000915 buffer_put_cstring(m, prompts[0]);
916
Damien Millerb7df3af2003-02-24 11:55:46 +1100917 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000918 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000919
Damien Millerb7df3af2003-02-24 11:55:46 +1100920 if (success) {
Darren Tuckera627d422013-06-02 07:31:17 +1000921 free(name);
922 free(infotxt);
923 free(prompts);
924 free(echo_on);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000925 }
926
927 return (0);
928}
929
930int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000931mm_answer_bsdauthrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000932{
933 char *response;
934 int authok;
935
936 if (authctxt->as == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000937 fatal("%s: no bsd auth session", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000938
939 response = buffer_get_string(m, NULL);
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000940 authok = options.challenge_response_authentication &&
941 auth_userresponse(authctxt->as, response, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000942 authctxt->as = NULL;
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000943 debug3("%s: <%s> = <%d>", __func__, response, authok);
Darren Tuckera627d422013-06-02 07:31:17 +1000944 free(response);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000945
946 buffer_clear(m);
947 buffer_put_int(m, authok);
948
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000949 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000950 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000951
Damien Miller91a55f22013-04-23 15:18:10 +1000952 if (compat20) {
953 auth_method = "keyboard-interactive";
954 auth_submethod = "bsdauth";
955 } else
Damien Millera6e3f012012-11-04 23:21:40 +1100956 auth_method = "bsdauth";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000957
958 return (authok != 0);
959}
960#endif
961
962#ifdef SKEY
963int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000964mm_answer_skeyquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000965{
966 struct skey skey;
967 char challenge[1024];
Damien Millerb7df3af2003-02-24 11:55:46 +1100968 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000969
Darren Tucker06a8cfe2004-04-14 17:24:30 +1000970 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
971 sizeof(challenge)) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000972
973 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100974 buffer_put_int(m, success);
975 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000976 buffer_put_cstring(m, challenge);
977
Damien Millerb7df3af2003-02-24 11:55:46 +1100978 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000979 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000980
981 return (0);
982}
983
984int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000985mm_answer_skeyrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000986{
987 char *response;
988 int authok;
989
990 response = buffer_get_string(m, NULL);
991
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000992 authok = (options.challenge_response_authentication &&
993 authctxt->valid &&
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000994 skey_haskey(authctxt->pw->pw_name) == 0 &&
995 skey_passcheck(authctxt->pw->pw_name, response) != -1);
996
Darren Tuckerf60845f2013-06-02 08:07:31 +1000997 free(response);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000998
999 buffer_clear(m);
1000 buffer_put_int(m, authok);
1001
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001002 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001003 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001004
1005 auth_method = "skey";
1006
1007 return (authok != 0);
1008}
1009#endif
1010
Damien Miller79418552002-04-23 20:28:48 +10001011#ifdef USE_PAM
1012int
Darren Tucker7eda5922004-06-22 13:22:50 +10001013mm_answer_pam_start(int sock, Buffer *m)
Damien Miller79418552002-04-23 20:28:48 +10001014{
Damien Miller4e448a32003-05-14 15:11:48 +10001015 if (!options.use_pam)
1016 fatal("UsePAM not set, but ended up in %s anyway", __func__);
1017
Darren Tuckerdbf7a742004-03-08 23:04:06 +11001018 start_pam(authctxt);
Damien Miller79418552002-04-23 20:28:48 +10001019
Damien Miller1f499fd2003-08-25 13:08:49 +10001020 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
1021
Damien Miller79418552002-04-23 20:28:48 +10001022 return (0);
1023}
Damien Miller4f9f42a2003-05-10 19:28:02 +10001024
Damien Miller1f499fd2003-08-25 13:08:49 +10001025int
Darren Tucker7eda5922004-06-22 13:22:50 +10001026mm_answer_pam_account(int sock, Buffer *m)
Damien Miller1f499fd2003-08-25 13:08:49 +10001027{
1028 u_int ret;
Damien Miller787b2ec2003-11-21 23:56:47 +11001029
Damien Miller1f499fd2003-08-25 13:08:49 +10001030 if (!options.use_pam)
1031 fatal("UsePAM not set, but ended up in %s anyway", __func__);
1032
1033 ret = do_pam_account();
1034
1035 buffer_put_int(m, ret);
Darren Tuckerd4f04ae2005-09-30 10:23:21 +10001036 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
Damien Miller1f499fd2003-08-25 13:08:49 +10001037
Darren Tucker7eda5922004-06-22 13:22:50 +10001038 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
Damien Miller1f499fd2003-08-25 13:08:49 +10001039
1040 return (ret);
1041}
1042
Damien Miller4f9f42a2003-05-10 19:28:02 +10001043static void *sshpam_ctxt, *sshpam_authok;
1044extern KbdintDevice sshpam_device;
1045
1046int
Darren Tucker7eda5922004-06-22 13:22:50 +10001047mm_answer_pam_init_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +10001048{
1049
1050 debug3("%s", __func__);
1051 authctxt->user = buffer_get_string(m, NULL);
1052 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
1053 sshpam_authok = NULL;
1054 buffer_clear(m);
1055 if (sshpam_ctxt != NULL) {
1056 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
1057 buffer_put_int(m, 1);
1058 } else {
1059 buffer_put_int(m, 0);
1060 }
Darren Tucker7eda5922004-06-22 13:22:50 +10001061 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001062 return (0);
1063}
1064
1065int
Darren Tucker7eda5922004-06-22 13:22:50 +10001066mm_answer_pam_query(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +10001067{
Darren Tucker8b7a0552010-08-03 15:50:16 +10001068 char *name = NULL, *info = NULL, **prompts = NULL;
1069 u_int i, num = 0, *echo_on = 0;
Damien Miller04b65332005-07-17 17:53:31 +10001070 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +10001071
1072 debug3("%s", __func__);
1073 sshpam_authok = NULL;
1074 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
1075 if (ret == 0 && num == 0)
1076 sshpam_authok = sshpam_ctxt;
1077 if (num > 1 || name == NULL || info == NULL)
1078 ret = -1;
1079 buffer_clear(m);
1080 buffer_put_int(m, ret);
1081 buffer_put_cstring(m, name);
Darren Tuckerf60845f2013-06-02 08:07:31 +10001082 free(name);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001083 buffer_put_cstring(m, info);
Darren Tuckerf60845f2013-06-02 08:07:31 +10001084 free(info);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001085 buffer_put_int(m, num);
1086 for (i = 0; i < num; ++i) {
1087 buffer_put_cstring(m, prompts[i]);
Darren Tuckerf60845f2013-06-02 08:07:31 +10001088 free(prompts[i]);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001089 buffer_put_int(m, echo_on[i]);
1090 }
Darren Tuckerf60845f2013-06-02 08:07:31 +10001091 free(prompts);
1092 free(echo_on);
Damien Miller15b05cf2012-12-03 09:53:20 +11001093 auth_method = "keyboard-interactive";
1094 auth_submethod = "pam";
Darren Tucker7eda5922004-06-22 13:22:50 +10001095 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001096 return (0);
1097}
1098
1099int
Darren Tucker7eda5922004-06-22 13:22:50 +10001100mm_answer_pam_respond(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +10001101{
1102 char **resp;
Damien Miller04b65332005-07-17 17:53:31 +10001103 u_int i, num;
1104 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +10001105
1106 debug3("%s", __func__);
1107 sshpam_authok = NULL;
1108 num = buffer_get_int(m);
1109 if (num > 0) {
Darren Tuckerd8093e42006-05-04 16:24:34 +10001110 resp = xcalloc(num, sizeof(char *));
Damien Miller4f9f42a2003-05-10 19:28:02 +10001111 for (i = 0; i < num; ++i)
1112 resp[i] = buffer_get_string(m, NULL);
1113 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
1114 for (i = 0; i < num; ++i)
Darren Tuckerf60845f2013-06-02 08:07:31 +10001115 free(resp[i]);
1116 free(resp);
Damien Miller4f9f42a2003-05-10 19:28:02 +10001117 } else {
1118 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
1119 }
1120 buffer_clear(m);
1121 buffer_put_int(m, ret);
Darren Tucker7eda5922004-06-22 13:22:50 +10001122 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
Damien Miller15b05cf2012-12-03 09:53:20 +11001123 auth_method = "keyboard-interactive";
1124 auth_submethod = "pam";
Damien Miller4f9f42a2003-05-10 19:28:02 +10001125 if (ret == 0)
1126 sshpam_authok = sshpam_ctxt;
1127 return (0);
1128}
1129
1130int
Darren Tucker7eda5922004-06-22 13:22:50 +10001131mm_answer_pam_free_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +10001132{
1133
1134 debug3("%s", __func__);
1135 (sshpam_device.free_ctx)(sshpam_ctxt);
1136 buffer_clear(m);
Darren Tucker7eda5922004-06-22 13:22:50 +10001137 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
Damien Miller15b05cf2012-12-03 09:53:20 +11001138 auth_method = "keyboard-interactive";
1139 auth_submethod = "pam";
Damien Miller4f9f42a2003-05-10 19:28:02 +10001140 return (sshpam_authok == sshpam_ctxt);
1141}
Damien Miller79418552002-04-23 20:28:48 +10001142#endif
1143
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001144int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001145mm_answer_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001146{
1147 Key *key;
Damien Millera10f5612002-09-12 09:49:15 +10001148 char *cuser, *chost;
1149 u_char *blob;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001150 u_int bloblen;
1151 enum mm_keytype type = 0;
1152 int allowed = 0;
1153
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001154 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001155
1156 type = buffer_get_int(m);
1157 cuser = buffer_get_string(m, NULL);
1158 chost = buffer_get_string(m, NULL);
1159 blob = buffer_get_string(m, &bloblen);
1160
1161 key = key_from_blob(blob, bloblen);
1162
1163 if ((compat20 && type == MM_RSAHOSTKEY) ||
1164 (!compat20 && type != MM_RSAHOSTKEY))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001165 fatal("%s: key type and protocol mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001166
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001167 debug3("%s: key_from_blob: %p", __func__, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001168
Damien Miller3e3b5142003-11-17 21:13:40 +11001169 if (key != NULL && authctxt->valid) {
Darren Tucker47eede72005-03-14 23:08:12 +11001170 switch (type) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001171 case MM_USERKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001172 allowed = options.pubkey_authentication &&
1173 user_key_allowed(authctxt->pw, key);
Damien Miller20bdcd72013-07-18 16:10:09 +10001174 pubkey_auth_info(authctxt, key, NULL);
Damien Miller7a8f5b32006-03-31 23:14:23 +11001175 auth_method = "publickey";
Darren Tuckerf2c16d32008-06-14 08:59:49 +10001176 if (options.pubkey_authentication && allowed != 1)
1177 auth_clear_options();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001178 break;
1179 case MM_HOSTKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001180 allowed = options.hostbased_authentication &&
1181 hostbased_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001182 cuser, chost, key);
Damien Miller20bdcd72013-07-18 16:10:09 +10001183 pubkey_auth_info(authctxt, key,
1184 "client user \"%.100s\", client host \"%.100s\"",
1185 cuser, chost);
Damien Miller7a8f5b32006-03-31 23:14:23 +11001186 auth_method = "hostbased";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001187 break;
Damien Miller1f0311c2014-05-15 14:24:09 +10001188#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001189 case MM_RSAHOSTKEY:
1190 key->type = KEY_RSA1; /* XXX */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001191 allowed = options.rhosts_rsa_authentication &&
1192 auth_rhosts_rsa_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001193 cuser, chost, key);
Darren Tuckerf2c16d32008-06-14 08:59:49 +10001194 if (options.rhosts_rsa_authentication && allowed != 1)
1195 auth_clear_options();
Damien Miller7a8f5b32006-03-31 23:14:23 +11001196 auth_method = "rsa";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001197 break;
Damien Miller1f0311c2014-05-15 14:24:09 +10001198#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001199 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001200 fatal("%s: unknown key type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001201 break;
1202 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001203 }
Damien Miller00111382003-03-10 11:21:17 +11001204 if (key != NULL)
1205 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001206
1207 /* clear temporarily storage (used by verify) */
1208 monitor_reset_key_state();
1209
1210 if (allowed) {
1211 /* Save temporarily for comparison in verify */
1212 key_blob = blob;
1213 key_bloblen = bloblen;
1214 key_blobtype = type;
1215 hostbased_cuser = cuser;
1216 hostbased_chost = chost;
Damien Miller96937bd2006-03-26 14:01:54 +11001217 } else {
Damien Miller7a8f5b32006-03-31 23:14:23 +11001218 /* Log failed attempt */
Darren Tucker0acca372013-06-02 07:41:51 +10001219 auth_log(authctxt, 0, 0, auth_method, NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001220 free(blob);
1221 free(cuser);
1222 free(chost);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001223 }
1224
1225 debug3("%s: key %p is %s",
Darren Tucker2784f1f2008-07-04 13:51:45 +10001226 __func__, key, allowed ? "allowed" : "not allowed");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001227
1228 buffer_clear(m);
1229 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001230 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001231
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001232 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001233
1234 if (type == MM_RSAHOSTKEY)
1235 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1236
1237 return (0);
1238}
1239
1240static int
1241monitor_valid_userblob(u_char *data, u_int datalen)
1242{
1243 Buffer b;
Damien Miller4ce189d2013-04-23 15:17:52 +10001244 char *p, *userstyle;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001245 u_int len;
1246 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001247
1248 buffer_init(&b);
1249 buffer_append(&b, data, datalen);
1250
1251 if (datafellows & SSH_OLD_SESSIONID) {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001252 p = buffer_ptr(&b);
1253 len = buffer_len(&b);
1254 if ((session_id2 == NULL) ||
1255 (len < session_id2_len) ||
Damien Millerea1651c2010-07-16 13:58:37 +10001256 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstromf67e0772002-06-06 20:58:19 +00001257 fail++;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001258 buffer_consume(&b, session_id2_len);
1259 } else {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001260 p = buffer_get_string(&b, &len);
1261 if ((session_id2 == NULL) ||
1262 (len != session_id2_len) ||
Damien Millerea1651c2010-07-16 13:58:37 +10001263 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001264 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001265 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001266 }
1267 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1268 fail++;
Damien Miller4ce189d2013-04-23 15:17:52 +10001269 p = buffer_get_cstring(&b, NULL);
1270 xasprintf(&userstyle, "%s%s%s", authctxt->user,
1271 authctxt->style ? ":" : "",
1272 authctxt->style ? authctxt->style : "");
1273 if (strcmp(userstyle, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001274 logit("wrong user name passed to monitor: expected %s != %.100s",
Damien Miller4ce189d2013-04-23 15:17:52 +10001275 userstyle, p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001276 fail++;
1277 }
Darren Tuckera627d422013-06-02 07:31:17 +10001278 free(userstyle);
1279 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001280 buffer_skip_string(&b);
1281 if (datafellows & SSH_BUG_PKAUTH) {
1282 if (!buffer_get_char(&b))
1283 fail++;
1284 } else {
Damien Miller4ce189d2013-04-23 15:17:52 +10001285 p = buffer_get_cstring(&b, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001286 if (strcmp("publickey", p) != 0)
1287 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001288 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001289 if (!buffer_get_char(&b))
1290 fail++;
1291 buffer_skip_string(&b);
1292 }
1293 buffer_skip_string(&b);
1294 if (buffer_len(&b) != 0)
1295 fail++;
1296 buffer_free(&b);
1297 return (fail == 0);
1298}
1299
1300static int
Damien Millera10f5612002-09-12 09:49:15 +10001301monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1302 char *chost)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001303{
1304 Buffer b;
Damien Miller4ce189d2013-04-23 15:17:52 +10001305 char *p, *userstyle;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001306 u_int len;
1307 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001308
1309 buffer_init(&b);
1310 buffer_append(&b, data, datalen);
1311
Ben Lindstromf67e0772002-06-06 20:58:19 +00001312 p = buffer_get_string(&b, &len);
1313 if ((session_id2 == NULL) ||
1314 (len != session_id2_len) ||
Damien Millerea1651c2010-07-16 13:58:37 +10001315 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001316 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001317 free(p);
Ben Lindstromf67e0772002-06-06 20:58:19 +00001318
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001319 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1320 fail++;
Damien Miller4ce189d2013-04-23 15:17:52 +10001321 p = buffer_get_cstring(&b, NULL);
1322 xasprintf(&userstyle, "%s%s%s", authctxt->user,
1323 authctxt->style ? ":" : "",
1324 authctxt->style ? authctxt->style : "");
1325 if (strcmp(userstyle, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001326 logit("wrong user name passed to monitor: expected %s != %.100s",
Damien Miller4ce189d2013-04-23 15:17:52 +10001327 userstyle, p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001328 fail++;
1329 }
Damien Miller4ce189d2013-04-23 15:17:52 +10001330 free(userstyle);
Darren Tuckera627d422013-06-02 07:31:17 +10001331 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001332 buffer_skip_string(&b); /* service */
Damien Miller4ce189d2013-04-23 15:17:52 +10001333 p = buffer_get_cstring(&b, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001334 if (strcmp(p, "hostbased") != 0)
1335 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001336 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001337 buffer_skip_string(&b); /* pkalg */
1338 buffer_skip_string(&b); /* pkblob */
1339
1340 /* verify client host, strip trailing dot if necessary */
1341 p = buffer_get_string(&b, NULL);
1342 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1343 p[len - 1] = '\0';
1344 if (strcmp(p, chost) != 0)
1345 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001346 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001347
1348 /* verify client user */
1349 p = buffer_get_string(&b, NULL);
1350 if (strcmp(p, cuser) != 0)
1351 fail++;
Darren Tuckera627d422013-06-02 07:31:17 +10001352 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001353
1354 if (buffer_len(&b) != 0)
1355 fail++;
1356 buffer_free(&b);
1357 return (fail == 0);
1358}
1359
1360int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001361mm_answer_keyverify(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001362{
1363 Key *key;
1364 u_char *signature, *data, *blob;
1365 u_int signaturelen, datalen, bloblen;
1366 int verified = 0;
1367 int valid_data = 0;
1368
1369 blob = buffer_get_string(m, &bloblen);
1370 signature = buffer_get_string(m, &signaturelen);
1371 data = buffer_get_string(m, &datalen);
1372
1373 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
Ben Lindstromb57a4bf2002-03-27 18:00:59 +00001374 !monitor_allowed_key(blob, bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001375 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001376
1377 key = key_from_blob(blob, bloblen);
1378 if (key == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001379 fatal("%s: bad public key blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001380
1381 switch (key_blobtype) {
1382 case MM_USERKEY:
1383 valid_data = monitor_valid_userblob(data, datalen);
1384 break;
1385 case MM_HOSTKEY:
1386 valid_data = monitor_valid_hostbasedblob(data, datalen,
1387 hostbased_cuser, hostbased_chost);
1388 break;
1389 default:
1390 valid_data = 0;
1391 break;
1392 }
1393 if (!valid_data)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001394 fatal("%s: bad signature data blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001395
1396 verified = key_verify(key, signature, signaturelen, data, datalen);
1397 debug3("%s: key %p signature %s",
Darren Tuckerfbba7352006-11-07 23:16:08 +11001398 __func__, key, (verified == 1) ? "verified" : "unverified");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001399
1400 key_free(key);
Darren Tuckera627d422013-06-02 07:31:17 +10001401 free(blob);
1402 free(signature);
1403 free(data);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001404
Ben Lindstrome1c09122002-06-23 00:38:24 +00001405 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1406
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001407 monitor_reset_key_state();
1408
1409 buffer_clear(m);
1410 buffer_put_int(m, verified);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001411 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001412
Darren Tuckerfbba7352006-11-07 23:16:08 +11001413 return (verified == 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001414}
1415
1416static void
1417mm_record_login(Session *s, struct passwd *pw)
1418{
1419 socklen_t fromlen;
1420 struct sockaddr_storage from;
1421
1422 /*
1423 * Get IP address of client. If the connection is not a socket, let
1424 * the address be 0.0.0.0.
1425 */
1426 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +10001427 fromlen = sizeof(from);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001428 if (packet_connection_is_on_socket()) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001429 if (getpeername(packet_get_connection_in(),
Damien Miller9f3bd532006-03-26 14:07:52 +11001430 (struct sockaddr *)&from, &fromlen) < 0) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001431 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +10001432 cleanup_exit(255);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001433 }
1434 }
1435 /* Record that there was a login on that tty from the remote host. */
1436 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
Damien Miller3a961dc2003-06-03 10:25:48 +10001437 get_remote_name_or_ip(utmp_len, options.use_dns),
Damien Millerebc23062002-09-04 16:45:09 +10001438 (struct sockaddr *)&from, fromlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001439}
1440
1441static void
1442mm_session_close(Session *s)
1443{
Damien Miller04bd8b02003-05-25 14:38:33 +10001444 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001445 if (s->ttyfd != -1) {
Damien Miller9ab00b42006-08-05 12:40:11 +10001446 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001447 session_pty_cleanup2(s);
1448 }
Damien Miller7207f642008-05-19 15:34:50 +10001449 session_unused(s->self);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001450}
1451
1452int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001453mm_answer_pty(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001454{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001455 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001456 Session *s;
1457 int res, fd0;
1458
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001459 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001460
1461 buffer_clear(m);
1462 s = session_new();
1463 if (s == NULL)
1464 goto error;
1465 s->authctxt = authctxt;
1466 s->pw = authctxt->pw;
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001467 s->pid = pmonitor->m_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001468 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1469 if (res == 0)
1470 goto error;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001471 pty_setowner(authctxt->pw, s->tty);
1472
1473 buffer_put_int(m, 1);
1474 buffer_put_cstring(m, s->tty);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001475
1476 /* We need to trick ttyslot */
1477 if (dup2(s->ttyfd, 0) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001478 fatal("%s: dup2", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001479
1480 mm_record_login(s, authctxt->pw);
1481
1482 /* Now we can close the file descriptor again */
1483 close(0);
1484
Darren Tucker09991742004-07-17 17:05:14 +10001485 /* send messages generated by record_login */
1486 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1487 buffer_clear(&loginmsg);
1488
1489 mm_request_send(sock, MONITOR_ANS_PTY, m);
1490
Damien Miller54fd7cf2007-09-17 12:04:08 +10001491 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1492 mm_send_fd(sock, s->ttyfd) == -1)
1493 fatal("%s: send fds failed", __func__);
Darren Tucker09991742004-07-17 17:05:14 +10001494
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001495 /* make sure nothing uses fd 0 */
1496 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001497 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001498 if (fd0 != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001499 error("%s: fd0 %d != 0", __func__, fd0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001500
1501 /* slave is not needed */
1502 close(s->ttyfd);
1503 s->ttyfd = s->ptyfd;
1504 /* no need to dup() because nobody closes ptyfd */
1505 s->ptymaster = s->ptyfd;
1506
Damien Miller9ab00b42006-08-05 12:40:11 +10001507 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001508
1509 return (0);
1510
1511 error:
1512 if (s != NULL)
1513 mm_session_close(s);
1514 buffer_put_int(m, 0);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001515 mm_request_send(sock, MONITOR_ANS_PTY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001516 return (0);
1517}
1518
1519int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001520mm_answer_pty_cleanup(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001521{
1522 Session *s;
1523 char *tty;
1524
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001525 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001526
1527 tty = buffer_get_string(m, NULL);
1528 if ((s = session_by_tty(tty)) != NULL)
1529 mm_session_close(s);
1530 buffer_clear(m);
Darren Tuckera627d422013-06-02 07:31:17 +10001531 free(tty);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001532 return (0);
1533}
1534
Damien Miller1f0311c2014-05-15 14:24:09 +10001535#ifdef WITH_SSH1
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001536int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001537mm_answer_sesskey(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001538{
1539 BIGNUM *p;
1540 int rsafail;
1541
1542 /* Turn off permissions */
Darren Tucker5b530262005-02-09 09:52:17 +11001543 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001544
1545 if ((p = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001546 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001547
1548 buffer_get_bignum2(m, p);
1549
1550 rsafail = ssh1_session_key(p);
1551
1552 buffer_clear(m);
1553 buffer_put_int(m, rsafail);
1554 buffer_put_bignum2(m, p);
1555
1556 BN_clear_free(p);
1557
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001558 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001559
1560 /* Turn on permissions for sessid passing */
1561 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1562
1563 return (0);
1564}
1565
1566int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001567mm_answer_sessid(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001568{
1569 int i;
1570
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001571 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001572
1573 if (buffer_len(m) != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001574 fatal("%s: bad ssh1 session id", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001575 for (i = 0; i < 16; i++)
1576 session_id[i] = buffer_get_char(m);
1577
1578 /* Turn on permissions for getpwnam */
1579 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1580
1581 return (0);
1582}
1583
1584int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001585mm_answer_rsa_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001586{
1587 BIGNUM *client_n;
1588 Key *key = NULL;
1589 u_char *blob = NULL;
1590 u_int blen = 0;
1591 int allowed = 0;
1592
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001593 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001594
Damien Miller7a8f5b32006-03-31 23:14:23 +11001595 auth_method = "rsa";
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001596 if (options.rsa_authentication && authctxt->valid) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001597 if ((client_n = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001598 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001599 buffer_get_bignum2(m, client_n);
1600 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1601 BN_clear_free(client_n);
1602 }
1603 buffer_clear(m);
1604 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001605 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001606
1607 /* clear temporarily storage (used by generate challenge) */
1608 monitor_reset_key_state();
1609
1610 if (allowed && key != NULL) {
1611 key->type = KEY_RSA; /* cheat for key_to_blob */
1612 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001613 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001614 buffer_put_string(m, blob, blen);
1615
1616 /* Save temporarily for comparison in verify */
1617 key_blob = blob;
1618 key_bloblen = blen;
1619 key_blobtype = MM_RSAUSERKEY;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001620 }
Damien Miller00111382003-03-10 11:21:17 +11001621 if (key != NULL)
1622 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001623
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001624 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001625
1626 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1627 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1628 return (0);
1629}
1630
1631int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001632mm_answer_rsa_challenge(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001633{
1634 Key *key = NULL;
1635 u_char *blob;
1636 u_int blen;
1637
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001638 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001639
1640 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001641 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001642 blob = buffer_get_string(m, &blen);
1643 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001644 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001645 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001646 fatal("%s: key type mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001647 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001648 fatal("%s: received bad key", __func__);
Damien Miller923e8bb2009-02-14 16:33:31 +11001649 if (key->type != KEY_RSA)
1650 fatal("%s: received bad key type %d", __func__, key->type);
1651 key->type = KEY_RSA1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001652 if (ssh1_challenge)
1653 BN_clear_free(ssh1_challenge);
1654 ssh1_challenge = auth_rsa_generate_challenge(key);
1655
1656 buffer_clear(m);
1657 buffer_put_bignum2(m, ssh1_challenge);
1658
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001659 debug3("%s sending reply", __func__);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001660 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001661
1662 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
Damien Miller00111382003-03-10 11:21:17 +11001663
Darren Tuckera627d422013-06-02 07:31:17 +10001664 free(blob);
Damien Miller00111382003-03-10 11:21:17 +11001665 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001666 return (0);
1667}
1668
1669int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001670mm_answer_rsa_response(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001671{
1672 Key *key = NULL;
1673 u_char *blob, *response;
1674 u_int blen, len;
1675 int success;
1676
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001677 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001678
1679 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001680 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001681 if (ssh1_challenge == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001682 fatal("%s: no ssh1_challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001683
1684 blob = buffer_get_string(m, &blen);
1685 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001686 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001687 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001688 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001689 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001690 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001691 response = buffer_get_string(m, &len);
1692 if (len != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001693 fatal("%s: received bad response to challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001694 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1695
Darren Tuckera627d422013-06-02 07:31:17 +10001696 free(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001697 key_free(key);
Darren Tuckera627d422013-06-02 07:31:17 +10001698 free(response);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001699
1700 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1701
1702 /* reset state */
1703 BN_clear_free(ssh1_challenge);
1704 ssh1_challenge = NULL;
1705 monitor_reset_key_state();
1706
1707 buffer_clear(m);
1708 buffer_put_int(m, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001709 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001710
1711 return (success);
1712}
Damien Miller1f0311c2014-05-15 14:24:09 +10001713#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001714
1715int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001716mm_answer_term(int sock, Buffer *req)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001717{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001718 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001719 int res, status;
1720
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001721 debug3("%s: tearing down sessions", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001722
1723 /* The child is terminating */
1724 session_destroy_all(&mm_session_close);
1725
Darren Tucker52358d62008-03-11 22:58:25 +11001726#ifdef USE_PAM
1727 if (options.use_pam)
1728 sshpam_cleanup();
1729#endif
1730
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001731 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
Ben Lindstrom47fd8112002-04-02 20:48:19 +00001732 if (errno != EINTR)
1733 exit(1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001734
1735 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1736
1737 /* Terminate process */
Darren Tucker1f8311c2004-05-13 16:39:33 +10001738 exit(res);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001739}
1740
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001741#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +11001742/* Report that an audit event occurred */
1743int
1744mm_answer_audit_event(int socket, Buffer *m)
1745{
1746 ssh_audit_event_t event;
1747
1748 debug3("%s entering", __func__);
1749
1750 event = buffer_get_int(m);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001751 switch(event) {
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001752 case SSH_AUTH_FAIL_PUBKEY:
1753 case SSH_AUTH_FAIL_HOSTBASED:
1754 case SSH_AUTH_FAIL_GSSAPI:
1755 case SSH_LOGIN_EXCEED_MAXTRIES:
1756 case SSH_LOGIN_ROOT_DENIED:
1757 case SSH_CONNECTION_CLOSE:
1758 case SSH_INVALID_USER:
Darren Tucker269a1ea2005-02-03 00:20:53 +11001759 audit_event(event);
1760 break;
1761 default:
1762 fatal("Audit event type %d not permitted", event);
1763 }
1764
1765 return (0);
1766}
1767
1768int
1769mm_answer_audit_command(int socket, Buffer *m)
1770{
1771 u_int len;
1772 char *cmd;
1773
1774 debug3("%s entering", __func__);
1775 cmd = buffer_get_string(m, &len);
1776 /* sanity check command, if so how? */
1777 audit_run_command(cmd);
Darren Tuckerf60845f2013-06-02 08:07:31 +10001778 free(cmd);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001779 return (0);
1780}
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001781#endif /* SSH_AUDIT_EVENTS */
Darren Tucker269a1ea2005-02-03 00:20:53 +11001782
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001783void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001784monitor_apply_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001785{
1786 if (compat20) {
1787 set_newkeys(MODE_IN);
1788 set_newkeys(MODE_OUT);
1789 } else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001790 packet_set_protocol_flags(child_state.ssh1protoflags);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001791 packet_set_encryption_key(child_state.ssh1key,
1792 child_state.ssh1keylen, child_state.ssh1cipher);
Darren Tuckera627d422013-06-02 07:31:17 +10001793 free(child_state.ssh1key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001794 }
1795
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001796 /* for rc4 and other stateful ciphers */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001797 packet_set_keycontext(MODE_OUT, child_state.keyout);
Darren Tuckera627d422013-06-02 07:31:17 +10001798 free(child_state.keyout);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001799 packet_set_keycontext(MODE_IN, child_state.keyin);
Darren Tuckera627d422013-06-02 07:31:17 +10001800 free(child_state.keyin);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001801
1802 if (!compat20) {
1803 packet_set_iv(MODE_OUT, child_state.ivout);
Darren Tuckera627d422013-06-02 07:31:17 +10001804 free(child_state.ivout);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001805 packet_set_iv(MODE_IN, child_state.ivin);
Darren Tuckera627d422013-06-02 07:31:17 +10001806 free(child_state.ivin);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001807 }
1808
1809 memcpy(&incoming_stream, &child_state.incoming,
1810 sizeof(incoming_stream));
1811 memcpy(&outgoing_stream, &child_state.outgoing,
1812 sizeof(outgoing_stream));
1813
1814 /* Update with new address */
Damien Miller2d6b8332002-06-21 15:59:49 +10001815 if (options.compression)
1816 mm_init_compression(pmonitor->m_zlib);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001817
Damien Millerc31a0cd2014-05-15 14:37:39 +10001818 packet_set_postauth();
1819
Darren Tucker5f96f3b2013-05-16 20:29:28 +10001820 if (options.rekey_limit || options.rekey_interval)
1821 packet_set_rekey_limits((u_int32_t)options.rekey_limit,
1822 (time_t)options.rekey_interval);
1823
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001824 /* Network I/O buffers */
1825 /* XXX inefficient for large buffers, need: buffer_init_from_string */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001826 buffer_clear(packet_get_input());
1827 buffer_append(packet_get_input(), child_state.input, child_state.ilen);
Damien Millera5103f42014-02-04 11:20:14 +11001828 explicit_bzero(child_state.input, child_state.ilen);
Darren Tuckera627d422013-06-02 07:31:17 +10001829 free(child_state.input);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001830
Darren Tuckerf7288d72009-06-21 18:12:20 +10001831 buffer_clear(packet_get_output());
1832 buffer_append(packet_get_output(), child_state.output,
1833 child_state.olen);
Damien Millera5103f42014-02-04 11:20:14 +11001834 explicit_bzero(child_state.output, child_state.olen);
Darren Tuckera627d422013-06-02 07:31:17 +10001835 free(child_state.output);
Darren Tuckerc5564e12009-06-21 18:53:53 +10001836
1837 /* Roaming */
1838 if (compat20)
1839 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001840}
1841
1842static Kex *
1843mm_get_kex(Buffer *m)
1844{
1845 Kex *kex;
1846 void *blob;
1847 u_int bloblen;
1848
Damien Miller07d86be2006-03-26 14:19:21 +11001849 kex = xcalloc(1, sizeof(*kex));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001850 kex->session_id = buffer_get_string(m, &kex->session_id_len);
Damien Miller8a0268f2010-07-16 13:57:51 +10001851 if (session_id2 == NULL ||
1852 kex->session_id_len != session_id2_len ||
Damien Millerea1651c2010-07-16 13:58:37 +10001853 timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0)
Ben Lindstromf67e0772002-06-06 20:58:19 +00001854 fatal("mm_get_get: internal error: bad session id");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001855 kex->we_need = buffer_get_int(m);
Damien Miller1f0311c2014-05-15 14:24:09 +10001856#ifdef WITH_OPENSSL
Damien Millerb062c292003-03-24 09:12:09 +11001857 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
Damien Millerf675fc42004-06-15 10:30:09 +10001858 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
Damien Millerb062c292003-03-24 09:12:09 +11001859 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
Damien Millera63128d2006-03-15 12:08:28 +11001860 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
Damien Millereb8b60e2010-08-31 22:41:14 +10001861 kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
Damien Miller1f0311c2014-05-15 14:24:09 +10001862#endif
Damien Millerc9831972013-11-07 12:00:23 +11001863 kex->kex[KEX_C25519_SHA256] = kexc25519_server;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001864 kex->server = 1;
1865 kex->hostkey_type = buffer_get_int(m);
1866 kex->kex_type = buffer_get_int(m);
1867 blob = buffer_get_string(m, &bloblen);
1868 buffer_init(&kex->my);
1869 buffer_append(&kex->my, blob, bloblen);
Darren Tuckera627d422013-06-02 07:31:17 +10001870 free(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001871 blob = buffer_get_string(m, &bloblen);
1872 buffer_init(&kex->peer);
1873 buffer_append(&kex->peer, blob, bloblen);
Darren Tuckera627d422013-06-02 07:31:17 +10001874 free(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001875 kex->done = 1;
1876 kex->flags = buffer_get_int(m);
1877 kex->client_version_string = buffer_get_string(m, NULL);
1878 kex->server_version_string = buffer_get_string(m, NULL);
Damien Miller0a80ca12010-02-27 07:55:05 +11001879 kex->load_host_public_key=&get_hostkey_public_by_type;
1880 kex->load_host_private_key=&get_hostkey_private_by_type;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001881 kex->host_key_index=&get_hostkey_index;
Damien Miller85b45e02013-07-20 13:21:52 +10001882 kex->sign = sshd_hostkey_sign;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001883
1884 return (kex);
1885}
1886
1887/* This function requries careful sanity checking */
1888
1889void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001890mm_get_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001891{
1892 Buffer m;
1893 u_char *blob, *p;
1894 u_int bloblen, plen;
Damien Millera5539d22003-04-09 20:50:06 +10001895 u_int32_t seqnr, packets;
Damien Millerb61f3fc2008-07-11 17:36:48 +10001896 u_int64_t blocks, bytes;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001897
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001898 debug3("%s: Waiting for new keys", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001899
1900 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001901 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001902 if (!compat20) {
1903 child_state.ssh1protoflags = buffer_get_int(&m);
1904 child_state.ssh1cipher = buffer_get_int(&m);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001905 child_state.ssh1key = buffer_get_string(&m,
1906 &child_state.ssh1keylen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001907 child_state.ivout = buffer_get_string(&m,
1908 &child_state.ivoutlen);
1909 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1910 goto skip;
1911 } else {
1912 /* Get the Kex for rekeying */
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001913 *pmonitor->m_pkex = mm_get_kex(&m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001914 }
1915
1916 blob = buffer_get_string(&m, &bloblen);
1917 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
Darren Tuckera627d422013-06-02 07:31:17 +10001918 free(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001919
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001920 debug3("%s: Waiting for second key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001921 blob = buffer_get_string(&m, &bloblen);
1922 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
Darren Tuckera627d422013-06-02 07:31:17 +10001923 free(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001924
1925 /* Now get sequence numbers for the packets */
Damien Millera5539d22003-04-09 20:50:06 +10001926 seqnr = buffer_get_int(&m);
1927 blocks = buffer_get_int64(&m);
1928 packets = buffer_get_int(&m);
Damien Millerb61f3fc2008-07-11 17:36:48 +10001929 bytes = buffer_get_int64(&m);
1930 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
Damien Millera5539d22003-04-09 20:50:06 +10001931 seqnr = buffer_get_int(&m);
1932 blocks = buffer_get_int64(&m);
1933 packets = buffer_get_int(&m);
Damien Millerb61f3fc2008-07-11 17:36:48 +10001934 bytes = buffer_get_int64(&m);
1935 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001936
1937 skip:
1938 /* Get the key context */
1939 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1940 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1941
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001942 debug3("%s: Getting compression state", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001943 /* Get compression state */
1944 p = buffer_get_string(&m, &plen);
1945 if (plen != sizeof(child_state.outgoing))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001946 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001947 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
Darren Tuckera627d422013-06-02 07:31:17 +10001948 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001949
1950 p = buffer_get_string(&m, &plen);
1951 if (plen != sizeof(child_state.incoming))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001952 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001953 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
Darren Tuckera627d422013-06-02 07:31:17 +10001954 free(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001955
1956 /* Network I/O buffers */
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001957 debug3("%s: Getting Network I/O buffers", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001958 child_state.input = buffer_get_string(&m, &child_state.ilen);
1959 child_state.output = buffer_get_string(&m, &child_state.olen);
1960
Darren Tuckerc5564e12009-06-21 18:53:53 +10001961 /* Roaming */
1962 if (compat20) {
1963 child_state.sent_bytes = buffer_get_int64(&m);
1964 child_state.recv_bytes = buffer_get_int64(&m);
1965 }
1966
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001967 buffer_free(&m);
1968}
1969
1970
1971/* Allocation functions for zlib */
1972void *
1973mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1974{
Ben Lindstrom41ee2b02002-11-09 15:47:47 +00001975 size_t len = (size_t) size * ncount;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001976 void *address;
1977
Ben Lindstrom0a4f7542002-08-20 18:36:25 +00001978 if (len == 0 || ncount > SIZE_T_MAX / size)
Damien Miller530a7542002-06-26 23:27:11 +10001979 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1980
1981 address = mm_malloc(mm, len);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001982
1983 return (address);
1984}
1985
1986void
1987mm_zfree(struct mm_master *mm, void *address)
1988{
1989 mm_free(mm, address);
1990}
1991
1992void
1993mm_init_compression(struct mm_master *mm)
1994{
1995 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1996 outgoing_stream.zfree = (free_func)mm_zfree;
1997 outgoing_stream.opaque = mm;
1998
1999 incoming_stream.zalloc = (alloc_func)mm_zalloc;
2000 incoming_stream.zfree = (free_func)mm_zfree;
2001 incoming_stream.opaque = mm;
2002}
2003
2004/* XXX */
2005
2006#define FD_CLOSEONEXEC(x) do { \
Damien Miller814ace02011-05-20 19:02:47 +10002007 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002008 fatal("fcntl(%d, F_SETFD)", x); \
2009} while (0)
2010
2011static void
Damien Miller8f0bf232011-06-20 14:42:23 +10002012monitor_openfds(struct monitor *mon, int do_logfds)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002013{
Damien Miller8f0bf232011-06-20 14:42:23 +10002014 int pair[2];
2015
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002016 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
Damien Miller8f0bf232011-06-20 14:42:23 +10002017 fatal("%s: socketpair: %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002018 FD_CLOSEONEXEC(pair[0]);
2019 FD_CLOSEONEXEC(pair[1]);
Damien Miller8f0bf232011-06-20 14:42:23 +10002020 mon->m_recvfd = pair[0];
2021 mon->m_sendfd = pair[1];
2022
2023 if (do_logfds) {
2024 if (pipe(pair) == -1)
2025 fatal("%s: pipe: %s", __func__, strerror(errno));
2026 FD_CLOSEONEXEC(pair[0]);
2027 FD_CLOSEONEXEC(pair[1]);
2028 mon->m_log_recvfd = pair[0];
2029 mon->m_log_sendfd = pair[1];
2030 } else
2031 mon->m_log_recvfd = mon->m_log_sendfd = -1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002032}
2033
2034#define MM_MEMSIZE 65536
2035
2036struct monitor *
2037monitor_init(void)
2038{
2039 struct monitor *mon;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002040
Damien Miller07d86be2006-03-26 14:19:21 +11002041 mon = xcalloc(1, sizeof(*mon));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002042
Damien Miller8f0bf232011-06-20 14:42:23 +10002043 monitor_openfds(mon, 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002044
2045 /* Used to share zlib space across processes */
Damien Miller2d6b8332002-06-21 15:59:49 +10002046 if (options.compression) {
2047 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
2048 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002049
Damien Miller2d6b8332002-06-21 15:59:49 +10002050 /* Compression needs to share state across borders */
2051 mm_init_compression(mon->m_zlib);
2052 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002053
2054 return mon;
2055}
2056
2057void
2058monitor_reinit(struct monitor *mon)
2059{
Damien Miller8f0bf232011-06-20 14:42:23 +10002060 monitor_openfds(mon, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002061}
Darren Tucker0efd1552003-08-26 11:49:55 +10002062
2063#ifdef GSSAPI
2064int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002065mm_answer_gss_setup_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10002066{
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002067 gss_OID_desc goid;
Darren Tucker0efd1552003-08-26 11:49:55 +10002068 OM_uint32 major;
2069 u_int len;
2070
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002071 goid.elements = buffer_get_string(m, &len);
2072 goid.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10002073
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002074 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
Darren Tucker0efd1552003-08-26 11:49:55 +10002075
Darren Tuckera627d422013-06-02 07:31:17 +10002076 free(goid.elements);
Darren Tucker0efd1552003-08-26 11:49:55 +10002077
2078 buffer_clear(m);
2079 buffer_put_int(m, major);
2080
Damien Miller6fd6def2005-11-05 15:07:05 +11002081 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10002082
2083 /* Now we have a context, enable the step */
2084 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
2085
2086 return (0);
2087}
2088
2089int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002090mm_answer_gss_accept_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10002091{
2092 gss_buffer_desc in;
2093 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
Damien Miller6fd6def2005-11-05 15:07:05 +11002094 OM_uint32 major, minor;
Darren Tucker0efd1552003-08-26 11:49:55 +10002095 OM_uint32 flags = 0; /* GSI needs this */
Darren Tucker600ad8d2003-08-26 12:10:48 +10002096 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +10002097
Darren Tucker600ad8d2003-08-26 12:10:48 +10002098 in.value = buffer_get_string(m, &len);
2099 in.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10002100 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
Darren Tuckera627d422013-06-02 07:31:17 +10002101 free(in.value);
Darren Tucker0efd1552003-08-26 11:49:55 +10002102
2103 buffer_clear(m);
2104 buffer_put_int(m, major);
2105 buffer_put_string(m, out.value, out.length);
2106 buffer_put_int(m, flags);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002107 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10002108
2109 gss_release_buffer(&minor, &out);
2110
Damien Miller6fd6def2005-11-05 15:07:05 +11002111 if (major == GSS_S_COMPLETE) {
Darren Tucker0efd1552003-08-26 11:49:55 +10002112 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
2113 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller0425d402003-11-17 22:18:21 +11002114 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
Darren Tucker0efd1552003-08-26 11:49:55 +10002115 }
2116 return (0);
2117}
2118
2119int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002120mm_answer_gss_checkmic(int sock, Buffer *m)
Damien Miller0425d402003-11-17 22:18:21 +11002121{
2122 gss_buffer_desc gssbuf, mic;
2123 OM_uint32 ret;
2124 u_int len;
Damien Miller787b2ec2003-11-21 23:56:47 +11002125
Damien Miller0425d402003-11-17 22:18:21 +11002126 gssbuf.value = buffer_get_string(m, &len);
2127 gssbuf.length = len;
2128 mic.value = buffer_get_string(m, &len);
2129 mic.length = len;
Damien Miller787b2ec2003-11-21 23:56:47 +11002130
Damien Miller0425d402003-11-17 22:18:21 +11002131 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +11002132
Darren Tuckera627d422013-06-02 07:31:17 +10002133 free(gssbuf.value);
2134 free(mic.value);
Damien Miller787b2ec2003-11-21 23:56:47 +11002135
Damien Miller0425d402003-11-17 22:18:21 +11002136 buffer_clear(m);
2137 buffer_put_int(m, ret);
Damien Miller787b2ec2003-11-21 23:56:47 +11002138
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002139 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
Damien Miller787b2ec2003-11-21 23:56:47 +11002140
Damien Miller0425d402003-11-17 22:18:21 +11002141 if (!GSS_ERROR(ret))
2142 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller787b2ec2003-11-21 23:56:47 +11002143
Damien Miller0425d402003-11-17 22:18:21 +11002144 return (0);
2145}
2146
2147int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002148mm_answer_gss_userok(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10002149{
2150 int authenticated;
2151
2152 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
2153
2154 buffer_clear(m);
2155 buffer_put_int(m, authenticated);
2156
2157 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002158 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10002159
Damien Miller6fd6def2005-11-05 15:07:05 +11002160 auth_method = "gssapi-with-mic";
Darren Tucker0efd1552003-08-26 11:49:55 +10002161
2162 /* Monitor loop will terminate if authenticated */
2163 return (authenticated);
2164}
2165#endif /* GSSAPI */
Damien Miller01ed2272008-11-05 16:20:46 +11002166