blob: 0e776224215d9f16990109334faffa1c6df3313a [file] [log] [blame]
djm@openbsd.orgbe02d7c2019-09-06 04:53:27 +00001/* $OpenBSD: auth2.c,v 1.157 2019/09/06 04:53:27 djm Exp $ */
Damien Millereba71ba2000-04-29 23:57:08 +10002/*
3 * Copyright (c) 2000 Markus Friedl. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
Damien Millereba71ba2000-04-29 23:57:08 +100013 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
Damien Millere4340be2000-09-16 13:29:08 +110025
Damien Millereba71ba2000-04-29 23:57:08 +100026#include "includes.h"
Damien Millereba71ba2000-04-29 23:57:08 +100027
Damien Miller9f2abc42006-07-10 20:53:08 +100028#include <sys/types.h>
Darren Tucker4230a5d2008-07-02 22:56:09 +100029#include <sys/stat.h>
30#include <sys/uio.h>
Damien Miller9f2abc42006-07-10 20:53:08 +100031
Darren Tucker4230a5d2008-07-02 22:56:09 +100032#include <fcntl.h>
djm@openbsd.org8f574952017-06-24 06:34:38 +000033#include <limits.h>
Damien Miller9f2abc42006-07-10 20:53:08 +100034#include <pwd.h>
Damien Millerd7834352006-08-05 12:39:39 +100035#include <stdarg.h>
Damien Millere3476ed2006-07-24 14:13:33 +100036#include <string.h>
Darren Tucker4230a5d2008-07-02 22:56:09 +100037#include <unistd.h>
djm@openbsd.org943d0962019-01-17 04:20:53 +000038#include <time.h>
Damien Miller9f2abc42006-07-10 20:53:08 +100039
djm@openbsd.orgbe02d7c2019-09-06 04:53:27 +000040#include "stdlib.h"
Damien Miller0b4d48b2008-07-05 09:44:53 +100041#include "atomicio.h"
Darren Tucker43e7a352009-06-21 19:50:08 +100042#include "xmalloc.h"
Damien Millerd7834352006-08-05 12:39:39 +100043#include "ssh2.h"
Damien Millereba71ba2000-04-29 23:57:08 +100044#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000045#include "log.h"
markus@openbsd.orgc7d39ac2018-07-09 21:35:50 +000046#include "sshbuf.h"
Damien Miller7acefbb2014-07-18 14:11:24 +100047#include "misc.h"
Damien Millereba71ba2000-04-29 23:57:08 +100048#include "servconf.h"
49#include "compat.h"
markus@openbsd.org5467fbc2018-07-11 18:53:29 +000050#include "sshkey.h"
Damien Millerd7834352006-08-05 12:39:39 +100051#include "hostfile.h"
Damien Millereba71ba2000-04-29 23:57:08 +100052#include "auth.h"
Damien Millereba71ba2000-04-29 23:57:08 +100053#include "dispatch.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000054#include "pathnames.h"
Damien Miller120a1ec2018-07-10 19:39:52 +100055#include "ssherr.h"
Darren Tucker0efd1552003-08-26 11:49:55 +100056#ifdef GSSAPI
57#include "ssh-gss.h"
58#endif
Damien Millerd7834352006-08-05 12:39:39 +100059#include "monitor_wrap.h"
dtucker@openbsd.orge9d910b2018-04-13 03:57:26 +000060#include "digest.h"
Darren Tucker0efd1552003-08-26 11:49:55 +100061
Damien Millereba71ba2000-04-29 23:57:08 +100062/* import */
63extern ServerOptions options;
Ben Lindstrom46c16222000-12-22 01:43:59 +000064extern u_char *session_id2;
Darren Tucker502d3842003-06-28 12:38:01 +100065extern u_int session_id2_len;
Damien Miller120a1ec2018-07-10 19:39:52 +100066extern struct sshbuf *loginmsg;
Damien Millereba71ba2000-04-29 23:57:08 +100067
Ben Lindstrom511bb242002-06-06 20:52:37 +000068/* methods */
69
70extern Authmethod method_none;
71extern Authmethod method_pubkey;
72extern Authmethod method_passwd;
73extern Authmethod method_kbdint;
74extern Authmethod method_hostbased;
Darren Tucker0efd1552003-08-26 11:49:55 +100075#ifdef GSSAPI
76extern Authmethod method_gssapi;
77#endif
Ben Lindstrom511bb242002-06-06 20:52:37 +000078
79Authmethod *authmethods[] = {
80 &method_none,
81 &method_pubkey,
Darren Tucker0efd1552003-08-26 11:49:55 +100082#ifdef GSSAPI
83 &method_gssapi,
84#endif
Ben Lindstrom511bb242002-06-06 20:52:37 +000085 &method_passwd,
86 &method_kbdint,
87 &method_hostbased,
88 NULL
Damien Miller874d77b2000-10-14 16:23:11 +110089};
90
Damien Millereba71ba2000-04-29 23:57:08 +100091/* protocol */
92
markus@openbsd.org2ae666a2017-05-30 14:23:52 +000093static int input_service_request(int, u_int32_t, struct ssh *);
94static int input_userauth_request(int, u_int32_t, struct ssh *);
Damien Millereba71ba2000-04-29 23:57:08 +100095
Damien Millereba71ba2000-04-29 23:57:08 +100096/* helper */
Damien Millera6e3f012012-11-04 23:21:40 +110097static Authmethod *authmethod_lookup(Authctxt *, const char *);
98static char *authmethods_get(Authctxt *authctxt);
Damien Miller91a55f22013-04-23 15:18:10 +100099
100#define MATCH_NONE 0 /* method or submethod mismatch */
101#define MATCH_METHOD 1 /* method matches (no submethod specified) */
102#define MATCH_BOTH 2 /* method and submethod match */
103#define MATCH_PARTIAL 3 /* method matches, submethod can't be checked */
104static int list_starts_with(const char *, const char *, const char *);
Damien Millereba71ba2000-04-29 23:57:08 +1000105
Darren Tucker4230a5d2008-07-02 22:56:09 +1000106char *
107auth2_read_banner(void)
108{
109 struct stat st;
110 char *banner = NULL;
111 size_t len, n;
112 int fd;
113
114 if ((fd = open(options.banner, O_RDONLY)) == -1)
115 return (NULL);
116 if (fstat(fd, &st) == -1) {
117 close(fd);
118 return (NULL);
119 }
Damien Miller8ed4de82011-12-19 10:52:50 +1100120 if (st.st_size <= 0 || st.st_size > 1*1024*1024) {
Darren Tucker4230a5d2008-07-02 22:56:09 +1000121 close(fd);
122 return (NULL);
123 }
124
125 len = (size_t)st.st_size; /* truncate */
126 banner = xmalloc(len + 1);
127 n = atomicio(read, fd, banner, len);
128 close(fd);
129
130 if (n != len) {
Darren Tuckera627d422013-06-02 07:31:17 +1000131 free(banner);
Darren Tucker4230a5d2008-07-02 22:56:09 +1000132 return (NULL);
133 }
134 banner[n] = '\0';
135
136 return (banner);
137}
138
Damien Miller5ebce132019-01-20 09:44:53 +1100139static void
140userauth_send_banner(struct ssh *ssh, const char *msg)
Darren Tucker4230a5d2008-07-02 22:56:09 +1000141{
Damien Miller5ebce132019-01-20 09:44:53 +1100142 int r;
143
144 if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_BANNER)) != 0 ||
145 (r = sshpkt_put_cstring(ssh, msg)) != 0 ||
146 (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language, unused */
147 (r = sshpkt_send(ssh)) != 0)
148 fatal("%s: %s", __func__, ssh_err(r));
Darren Tucker4230a5d2008-07-02 22:56:09 +1000149 debug("%s: sent", __func__);
150}
151
152static void
Damien Miller5ebce132019-01-20 09:44:53 +1100153userauth_banner(struct ssh *ssh)
Darren Tucker4230a5d2008-07-02 22:56:09 +1000154{
155 char *banner = NULL;
156
djm@openbsd.org14b5c632018-01-23 05:27:21 +0000157 if (options.banner == NULL)
Darren Tucker4230a5d2008-07-02 22:56:09 +1000158 return;
159
160 if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
161 goto done;
Damien Miller5ebce132019-01-20 09:44:53 +1100162 userauth_send_banner(ssh, banner);
Darren Tucker4230a5d2008-07-02 22:56:09 +1000163
164done:
Darren Tuckera627d422013-06-02 07:31:17 +1000165 free(banner);
Darren Tucker4230a5d2008-07-02 22:56:09 +1000166}
167
Damien Millereba71ba2000-04-29 23:57:08 +1000168/*
Damien Miller874d77b2000-10-14 16:23:11 +1100169 * loop until authctxt->success == TRUE
Damien Millereba71ba2000-04-29 23:57:08 +1000170 */
Darren Tucker3e33cec2003-10-02 16:12:36 +1000171void
Damien Miller5ebce132019-01-20 09:44:53 +1100172do_authentication2(struct ssh *ssh)
Damien Millereba71ba2000-04-29 23:57:08 +1000173{
Damien Miller5ebce132019-01-20 09:44:53 +1100174 Authctxt *authctxt = ssh->authctxt;
175
markus@openbsd.orgeb272ea2017-05-30 14:29:59 +0000176 ssh_dispatch_init(ssh, &dispatch_protocol_error);
177 ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_REQUEST, &input_service_request);
markus@openbsd.org92e9fe62017-05-31 07:00:13 +0000178 ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt->success);
markus@openbsd.org5f4082d2017-05-30 14:18:15 +0000179 ssh->authctxt = NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000180}
181
Damien Miller91d4b122006-03-26 14:05:20 +1100182/*ARGSUSED*/
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000183static int
markus@openbsd.org2ae666a2017-05-30 14:23:52 +0000184input_service_request(int type, u_int32_t seq, struct ssh *ssh)
Damien Millereba71ba2000-04-29 23:57:08 +1000185{
markus@openbsd.org5f4082d2017-05-30 14:18:15 +0000186 Authctxt *authctxt = ssh->authctxt;
Damien Miller5ebce132019-01-20 09:44:53 +1100187 char *service = NULL;
188 int r, acceptit = 0;
189
190 if ((r = sshpkt_get_cstring(ssh, &service, NULL)) != 0 ||
191 (r = sshpkt_get_end(ssh)) != 0)
192 goto out;
Damien Millereba71ba2000-04-29 23:57:08 +1000193
Damien Miller874d77b2000-10-14 16:23:11 +1100194 if (authctxt == NULL)
195 fatal("input_service_request: no authctxt");
196
Damien Millereba71ba2000-04-29 23:57:08 +1000197 if (strcmp(service, "ssh-userauth") == 0) {
Damien Miller874d77b2000-10-14 16:23:11 +1100198 if (!authctxt->success) {
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +0000199 acceptit = 1;
Damien Millereba71ba2000-04-29 23:57:08 +1000200 /* now we can handle user-auth requests */
Damien Miller5ebce132019-01-20 09:44:53 +1100201 ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_REQUEST,
202 &input_userauth_request);
Damien Millereba71ba2000-04-29 23:57:08 +1000203 }
204 }
205 /* XXX all other service requests are denied */
206
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +0000207 if (acceptit) {
Damien Miller5ebce132019-01-20 09:44:53 +1100208 if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_ACCEPT)) != 0 ||
209 (r = sshpkt_put_cstring(ssh, service)) != 0 ||
210 (r = sshpkt_send(ssh)) != 0 ||
211 (r = ssh_packet_write_wait(ssh)) != 0)
212 goto out;
Damien Millereba71ba2000-04-29 23:57:08 +1000213 } else {
214 debug("bad service request %s", service);
Damien Miller5ebce132019-01-20 09:44:53 +1100215 ssh_packet_disconnect(ssh, "bad service request %s", service);
Damien Millereba71ba2000-04-29 23:57:08 +1000216 }
Damien Miller5ebce132019-01-20 09:44:53 +1100217 r = 0;
218 out:
Darren Tuckera627d422013-06-02 07:31:17 +1000219 free(service);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000220 return 0;
Damien Millereba71ba2000-04-29 23:57:08 +1000221}
222
dtucker@openbsd.orge9d910b2018-04-13 03:57:26 +0000223#define MIN_FAIL_DELAY_SECONDS 0.005
224static double
225user_specific_delay(const char *user)
226{
227 char b[512];
228 size_t len = ssh_digest_bytes(SSH_DIGEST_SHA512);
229 u_char *hash = xmalloc(len);
230 double delay;
231
dtucker@openbsd.orgfdba5032018-05-11 03:22:55 +0000232 (void)snprintf(b, sizeof b, "%llu%s",
233 (unsigned long long)options.timing_secret, user);
dtucker@openbsd.orge9d910b2018-04-13 03:57:26 +0000234 if (ssh_digest_memory(SSH_DIGEST_SHA512, b, strlen(b), hash, len) != 0)
235 fatal("%s: ssh_digest_memory", __func__);
236 /* 0-4.2 ms of delay */
237 delay = (double)PEEK_U32(hash) / 1000 / 1000 / 1000 / 1000;
238 freezero(hash, len);
239 debug3("%s: user specific delay %0.3lfms", __func__, delay/1000);
240 return MIN_FAIL_DELAY_SECONDS + delay;
241}
242
243static void
244ensure_minimum_time_since(double start, double seconds)
245{
246 struct timespec ts;
247 double elapsed = monotime_double() - start, req = seconds, remain;
248
249 /* if we've already passed the requested time, scale up */
250 while ((remain = seconds - elapsed) < 0.0)
251 seconds *= 2;
252
253 ts.tv_sec = remain;
254 ts.tv_nsec = (remain - ts.tv_sec) * 1000000000;
255 debug3("%s: elapsed %0.3lfms, delaying %0.3lfms (requested %0.3lfms)",
256 __func__, elapsed*1000, remain*1000, req*1000);
257 nanosleep(&ts, NULL);
258}
259
Damien Miller91d4b122006-03-26 14:05:20 +1100260/*ARGSUSED*/
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000261static int
markus@openbsd.org2ae666a2017-05-30 14:23:52 +0000262input_userauth_request(int type, u_int32_t seq, struct ssh *ssh)
Damien Millereba71ba2000-04-29 23:57:08 +1000263{
markus@openbsd.org5f4082d2017-05-30 14:18:15 +0000264 Authctxt *authctxt = ssh->authctxt;
Damien Miller874d77b2000-10-14 16:23:11 +1100265 Authmethod *m = NULL;
Damien Miller5ebce132019-01-20 09:44:53 +1100266 char *user = NULL, *service = NULL, *method = NULL, *style = NULL;
267 int r, authenticated = 0;
dtucker@openbsd.orge9d910b2018-04-13 03:57:26 +0000268 double tstart = monotime_double();
Damien Millereba71ba2000-04-29 23:57:08 +1000269
Damien Miller874d77b2000-10-14 16:23:11 +1100270 if (authctxt == NULL)
271 fatal("input_userauth_request: no authctxt");
Damien Millereba71ba2000-04-29 23:57:08 +1000272
Damien Miller5ebce132019-01-20 09:44:53 +1100273 if ((r = sshpkt_get_cstring(ssh, &user, NULL)) != 0 ||
274 (r = sshpkt_get_cstring(ssh, &service, NULL)) != 0 ||
275 (r = sshpkt_get_cstring(ssh, &method, NULL)) != 0)
276 goto out;
Damien Miller874d77b2000-10-14 16:23:11 +1100277 debug("userauth-request for user %s service %s method %s", user, service, method);
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000278 debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
Damien Miller874d77b2000-10-14 16:23:11 +1100279
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000280 if ((style = strchr(user, ':')) != NULL)
281 *style++ = 0;
282
Kevin Stevesef4eea92001-02-05 12:42:17 +0000283 if (authctxt->attempt++ == 0) {
Damien Miller3a5b0232002-03-13 13:19:42 +1100284 /* setup auth context */
djm@openbsd.org3a00a922019-01-19 21:41:18 +0000285 authctxt->pw = PRIVSEP(getpwnamallow(ssh, user));
Darren Tuckerdbf7a742004-03-08 23:04:06 +1100286 authctxt->user = xstrdup(user);
Kevin Steves205cc1e2002-03-22 20:43:05 +0000287 if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
Damien Miller874d77b2000-10-14 16:23:11 +1100288 authctxt->valid = 1;
djm@openbsd.orgf1a19342017-02-03 23:05:57 +0000289 debug2("%s: setting up authctxt for %s",
290 __func__, user);
Damien Miller874d77b2000-10-14 16:23:11 +1100291 } else {
djm@openbsd.orgf1a19342017-02-03 23:05:57 +0000292 /* Invalid user, fake password information */
Damien Miller856f0be2003-09-03 07:32:45 +1000293 authctxt->pw = fakepw();
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100294#ifdef SSH_AUDIT_EVENTS
Damien Miller9b655dc2019-01-20 14:55:27 +1100295 PRIVSEP(audit_event(ssh, SSH_INVALID_USER));
Darren Tucker269a1ea2005-02-03 00:20:53 +1100296#endif
Damien Miller874d77b2000-10-14 16:23:11 +1100297 }
Darren Tuckerd3eff2b2005-09-24 12:43:51 +1000298#ifdef USE_PAM
299 if (options.use_pam)
Damien Miller3f0786b2019-01-20 10:22:18 +1100300 PRIVSEP(start_pam(ssh));
Darren Tuckerd3eff2b2005-09-24 12:43:51 +1000301#endif
djm@openbsd.orgf1a19342017-02-03 23:05:57 +0000302 ssh_packet_set_log_preamble(ssh, "%suser %s",
303 authctxt->valid ? "authenticating " : "invalid ", user);
Damien Miller30d1f842004-07-21 20:48:53 +1000304 setproctitle("%s%s", authctxt->valid ? user : "unknown",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000305 use_privsep ? " [net]" : "");
Damien Miller874d77b2000-10-14 16:23:11 +1100306 authctxt->service = xstrdup(service);
Ben Lindstrom9d0c0662001-06-09 01:40:00 +0000307 authctxt->style = style ? xstrdup(style) : NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000308 if (use_privsep)
309 mm_inform_authserv(service, style);
Damien Miller5ebce132019-01-20 09:44:53 +1100310 userauth_banner(ssh);
Damien Millera6e3f012012-11-04 23:21:40 +1100311 if (auth2_setup_methods_lists(authctxt) != 0)
Damien Miller5ebce132019-01-20 09:44:53 +1100312 ssh_packet_disconnect(ssh,
313 "no authentication methods enabled");
Ben Lindstrom9d0c0662001-06-09 01:40:00 +0000314 } else if (strcmp(user, authctxt->user) != 0 ||
315 strcmp(service, authctxt->service) != 0) {
Damien Miller5ebce132019-01-20 09:44:53 +1100316 ssh_packet_disconnect(ssh, "Change of username or service "
317 "not allowed: (%s,%s) -> (%s,%s)",
Ben Lindstrom9d0c0662001-06-09 01:40:00 +0000318 authctxt->user, authctxt->service, user, service);
Damien Millereba71ba2000-04-29 23:57:08 +1000319 }
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000320 /* reset state */
markus@openbsd.orgeb272ea2017-05-30 14:29:59 +0000321 auth2_challenge_stop(ssh);
Darren Tucker0efd1552003-08-26 11:49:55 +1000322
323#ifdef GSSAPI
Damien Miller01ed2272008-11-05 16:20:46 +1100324 /* XXX move to auth2_gssapi_stop() */
markus@openbsd.orgeb272ea2017-05-30 14:29:59 +0000325 ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
326 ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
Darren Tucker0efd1552003-08-26 11:49:55 +1000327#endif
328
djm@openbsd.org8f574952017-06-24 06:34:38 +0000329 auth2_authctxt_reset_info(authctxt);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000330 authctxt->postponed = 0;
Damien Miller3fcdfd52011-05-05 14:04:11 +1000331 authctxt->server_caused_failure = 0;
Damien Millerb70b61f2000-09-16 16:25:12 +1100332
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000333 /* try to authenticate user */
Damien Millera6e3f012012-11-04 23:21:40 +1100334 m = authmethod_lookup(authctxt, method);
Darren Tucker4230a5d2008-07-02 22:56:09 +1000335 if (m != NULL && authctxt->failures < options.max_authtries) {
Damien Miller874d77b2000-10-14 16:23:11 +1100336 debug2("input_userauth_request: try method %s", method);
markus@openbsd.orgeb272ea2017-05-30 14:29:59 +0000337 authenticated = m->userauth(ssh);
Damien Miller874d77b2000-10-14 16:23:11 +1100338 }
dtucker@openbsd.orge9d910b2018-04-13 03:57:26 +0000339 if (!authctxt->authenticated)
340 ensure_minimum_time_since(tstart,
341 user_specific_delay(authctxt->user));
markus@openbsd.orgeb272ea2017-05-30 14:29:59 +0000342 userauth_finish(ssh, authenticated, method, NULL);
Damien Miller5ebce132019-01-20 09:44:53 +1100343 r = 0;
344 out:
Darren Tuckera627d422013-06-02 07:31:17 +1000345 free(service);
346 free(user);
347 free(method);
Damien Miller5ebce132019-01-20 09:44:53 +1100348 return r;
Damien Miller5d57e502001-03-30 10:48:31 +1000349}
350
351void
markus@openbsd.orgeb272ea2017-05-30 14:29:59 +0000352userauth_finish(struct ssh *ssh, int authenticated, const char *method,
Damien Miller15b05cf2012-12-03 09:53:20 +1100353 const char *submethod)
Damien Miller5d57e502001-03-30 10:48:31 +1000354{
markus@openbsd.orgeb272ea2017-05-30 14:29:59 +0000355 Authctxt *authctxt = ssh->authctxt;
Ben Lindstromcd4349f2001-06-09 00:23:17 +0000356 char *methods;
Damien Miller5ebce132019-01-20 09:44:53 +1100357 int r, partial = 0;
Ben Lindstromcd4349f2001-06-09 00:23:17 +0000358
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000359 if (!authctxt->valid && authenticated)
360 fatal("INTERNAL ERROR: authenticated invalid user %s",
361 authctxt->user);
Damien Miller15b05cf2012-12-03 09:53:20 +1100362 if (authenticated && authctxt->postponed)
363 fatal("INTERNAL ERROR: authenticated and postponed");
Damien Millerb70b61f2000-09-16 16:25:12 +1100364
Damien Miller874d77b2000-10-14 16:23:11 +1100365 /* Special handling for root */
Damien Miller556f9312003-02-24 11:59:26 +1100366 if (authenticated && authctxt->pw->pw_uid == 0 &&
djm@openbsd.org7c856852018-03-03 03:15:51 +0000367 !auth_root_allowed(ssh, method)) {
Damien Millereba71ba2000-04-29 23:57:08 +1000368 authenticated = 0;
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100369#ifdef SSH_AUDIT_EVENTS
Damien Miller9b655dc2019-01-20 14:55:27 +1100370 PRIVSEP(audit_event(ssh, SSH_LOGIN_ROOT_DENIED));
Darren Tucker269a1ea2005-02-03 00:20:53 +1100371#endif
372 }
Damien Millereba71ba2000-04-29 23:57:08 +1000373
Damien Miller15b05cf2012-12-03 09:53:20 +1100374 if (authenticated && options.num_auth_methods != 0) {
Damien Miller91a55f22013-04-23 15:18:10 +1000375 if (!auth2_update_methods_lists(authctxt, method, submethod)) {
Damien Miller15b05cf2012-12-03 09:53:20 +1100376 authenticated = 0;
377 partial = 1;
378 }
379 }
380
381 /* Log before sending the reply */
djm@openbsd.org3a00a922019-01-19 21:41:18 +0000382 auth_log(ssh, authenticated, partial, method, submethod);
Damien Miller15b05cf2012-12-03 09:53:20 +1100383
djm@openbsd.org8f574952017-06-24 06:34:38 +0000384 /* Update information exposed to session */
385 if (authenticated || partial)
386 auth2_update_session_info(authctxt, method, submethod);
387
Damien Miller15b05cf2012-12-03 09:53:20 +1100388 if (authctxt->postponed)
389 return;
390
Damien Miller1f499fd2003-08-25 13:08:49 +1000391#ifdef USE_PAM
Darren Tucker77fc29e2004-09-11 23:07:03 +1000392 if (options.use_pam && authenticated) {
Damien Miller120a1ec2018-07-10 19:39:52 +1000393 int r;
394
Darren Tucker77fc29e2004-09-11 23:07:03 +1000395 if (!PRIVSEP(do_pam_account())) {
Darren Tucker77fc29e2004-09-11 23:07:03 +1000396 /* if PAM returned a message, send it to the user */
Damien Miller120a1ec2018-07-10 19:39:52 +1000397 if (sshbuf_len(loginmsg) > 0) {
398 if ((r = sshbuf_put(loginmsg, "\0", 1)) != 0)
399 fatal("%s: buffer error: %s",
400 __func__, ssh_err(r));
Damien Miller5ebce132019-01-20 09:44:53 +1100401 userauth_send_banner(ssh, sshbuf_ptr(loginmsg));
Damien Miller08f66d92019-01-20 09:58:45 +1100402 if ((r = ssh_packet_write_wait(ssh)) != 0) {
403 sshpkt_fatal(ssh, r,
404 "%s: send PAM banner", __func__);
405 }
Darren Tucker77fc29e2004-09-11 23:07:03 +1000406 }
Darren Tuckerc1386672004-12-03 14:33:47 +1100407 fatal("Access denied for user %s by PAM account "
Damien Millerb6f72f52005-07-17 17:26:43 +1000408 "configuration", authctxt->user);
Darren Tucker77fc29e2004-09-11 23:07:03 +1000409 }
410 }
Damien Miller1f499fd2003-08-25 13:08:49 +1000411#endif
412
Ben Lindstromcd4349f2001-06-09 00:23:17 +0000413 if (authenticated == 1) {
414 /* turn off userauth */
Damien Miller5ebce132019-01-20 09:44:53 +1100415 ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_REQUEST,
416 &dispatch_protocol_ignore);
417 if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_SUCCESS)) != 0 ||
418 (r = sshpkt_send(ssh)) != 0 ||
419 (r = ssh_packet_write_wait(ssh)) != 0)
420 fatal("%s: %s", __func__, ssh_err(r));
Ben Lindstromcd4349f2001-06-09 00:23:17 +0000421 /* now we can break out */
422 authctxt->success = 1;
djm@openbsd.orgf1a19342017-02-03 23:05:57 +0000423 ssh_packet_set_log_preamble(ssh, "user %s", authctxt->user);
Ben Lindstromcd4349f2001-06-09 00:23:17 +0000424 } else {
Damien Miller0b4d48b2008-07-05 09:44:53 +1000425 /* Allow initial try of "none" auth without failure penalty */
djm@openbsd.org058f8392014-12-18 23:58:04 +0000426 if (!partial && !authctxt->server_caused_failure &&
Damien Miller3fcdfd52011-05-05 14:04:11 +1000427 (authctxt->attempt > 1 || strcmp(method, "none") != 0))
Damien Miller0b4d48b2008-07-05 09:44:53 +1000428 authctxt->failures++;
429 if (authctxt->failures >= options.max_authtries) {
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100430#ifdef SSH_AUDIT_EVENTS
Damien Miller9b655dc2019-01-20 14:55:27 +1100431 PRIVSEP(audit_event(ssh, SSH_LOGIN_EXCEED_MAXTRIES));
Darren Tucker269a1ea2005-02-03 00:20:53 +1100432#endif
djm@openbsd.org3a00a922019-01-19 21:41:18 +0000433 auth_maxtries_exceeded(ssh);
Darren Tucker269a1ea2005-02-03 00:20:53 +1100434 }
Damien Millera6e3f012012-11-04 23:21:40 +1100435 methods = authmethods_get(authctxt);
436 debug3("%s: failure partial=%d next methods=\"%s\"", __func__,
437 partial, methods);
Damien Miller5ebce132019-01-20 09:44:53 +1100438 if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_FAILURE)) != 0 ||
439 (r = sshpkt_put_cstring(ssh, methods)) != 0 ||
440 (r = sshpkt_put_u8(ssh, partial)) != 0 ||
441 (r = sshpkt_send(ssh)) != 0 ||
442 (r = ssh_packet_write_wait(ssh)) != 0)
443 fatal("%s: %s", __func__, ssh_err(r));
Darren Tuckera627d422013-06-02 07:31:17 +1000444 free(methods);
Ben Lindstromcd4349f2001-06-09 00:23:17 +0000445 }
Damien Miller874d77b2000-10-14 16:23:11 +1100446}
447
Damien Millera6e3f012012-11-04 23:21:40 +1100448/*
449 * Checks whether method is allowed by at least one AuthenticationMethods
450 * methods list. Returns 1 if allowed, or no methods lists configured.
451 * 0 otherwise.
452 */
Damien Miller91a55f22013-04-23 15:18:10 +1000453int
454auth2_method_allowed(Authctxt *authctxt, const char *method,
455 const char *submethod)
Damien Millera6e3f012012-11-04 23:21:40 +1100456{
457 u_int i;
458
459 /*
460 * NB. authctxt->num_auth_methods might be zero as a result of
461 * auth2_setup_methods_lists(), so check the configuration.
462 */
463 if (options.num_auth_methods == 0)
464 return 1;
465 for (i = 0; i < authctxt->num_auth_methods; i++) {
Damien Miller91a55f22013-04-23 15:18:10 +1000466 if (list_starts_with(authctxt->auth_methods[i], method,
467 submethod) != MATCH_NONE)
Damien Millera6e3f012012-11-04 23:21:40 +1100468 return 1;
469 }
470 return 0;
471}
472
Ben Lindstrom79073822001-07-04 03:42:30 +0000473static char *
Damien Millera6e3f012012-11-04 23:21:40 +1100474authmethods_get(Authctxt *authctxt)
Damien Miller874d77b2000-10-14 16:23:11 +1100475{
markus@openbsd.orgc7d39ac2018-07-09 21:35:50 +0000476 struct sshbuf *b;
Damien Miller874d77b2000-10-14 16:23:11 +1100477 char *list;
markus@openbsd.orgc7d39ac2018-07-09 21:35:50 +0000478 int i, r;
Damien Miller874d77b2000-10-14 16:23:11 +1100479
markus@openbsd.orgc7d39ac2018-07-09 21:35:50 +0000480 if ((b = sshbuf_new()) == NULL)
481 fatal("%s: sshbuf_new failed", __func__);
Ben Lindstrom511bb242002-06-06 20:52:37 +0000482 for (i = 0; authmethods[i] != NULL; i++) {
483 if (strcmp(authmethods[i]->name, "none") == 0)
Damien Miller874d77b2000-10-14 16:23:11 +1100484 continue;
Damien Millera6e3f012012-11-04 23:21:40 +1100485 if (authmethods[i]->enabled == NULL ||
486 *(authmethods[i]->enabled) == 0)
487 continue;
Damien Miller91a55f22013-04-23 15:18:10 +1000488 if (!auth2_method_allowed(authctxt, authmethods[i]->name,
489 NULL))
Damien Millera6e3f012012-11-04 23:21:40 +1100490 continue;
markus@openbsd.orgc7d39ac2018-07-09 21:35:50 +0000491 if ((r = sshbuf_putf(b, "%s%s", sshbuf_len(b) ? "," : "",
492 authmethods[i]->name)) != 0)
493 fatal("%s: buffer error: %s", __func__, ssh_err(r));
Damien Millereba71ba2000-04-29 23:57:08 +1000494 }
markus@openbsd.orgc7d39ac2018-07-09 21:35:50 +0000495 if ((list = sshbuf_dup_string(b)) == NULL)
djm@openbsd.org1a31d022016-05-02 08:49:03 +0000496 fatal("%s: sshbuf_dup_string failed", __func__);
markus@openbsd.orgc7d39ac2018-07-09 21:35:50 +0000497 sshbuf_free(b);
Damien Miller874d77b2000-10-14 16:23:11 +1100498 return list;
499}
500
Ben Lindstrombba81212001-06-25 05:01:22 +0000501static Authmethod *
Damien Millera6e3f012012-11-04 23:21:40 +1100502authmethod_lookup(Authctxt *authctxt, const char *name)
Damien Miller874d77b2000-10-14 16:23:11 +1100503{
Ben Lindstrom511bb242002-06-06 20:52:37 +0000504 int i;
505
Damien Miller874d77b2000-10-14 16:23:11 +1100506 if (name != NULL)
Ben Lindstrom511bb242002-06-06 20:52:37 +0000507 for (i = 0; authmethods[i] != NULL; i++)
508 if (authmethods[i]->enabled != NULL &&
509 *(authmethods[i]->enabled) != 0 &&
Damien Millera6e3f012012-11-04 23:21:40 +1100510 strcmp(name, authmethods[i]->name) == 0 &&
Damien Miller91a55f22013-04-23 15:18:10 +1000511 auth2_method_allowed(authctxt,
512 authmethods[i]->name, NULL))
Ben Lindstrom511bb242002-06-06 20:52:37 +0000513 return authmethods[i];
514 debug2("Unrecognized authentication method name: %s",
515 name ? name : "NULL");
Damien Miller874d77b2000-10-14 16:23:11 +1100516 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000517}
Darren Tucker4230a5d2008-07-02 22:56:09 +1000518
Damien Millera6e3f012012-11-04 23:21:40 +1100519/*
520 * Check a comma-separated list of methods for validity. Is need_enable is
521 * non-zero, then also require that the methods are enabled.
522 * Returns 0 on success or -1 if the methods list is invalid.
523 */
524int
525auth2_methods_valid(const char *_methods, int need_enable)
526{
Damien Miller91a55f22013-04-23 15:18:10 +1000527 char *methods, *omethods, *method, *p;
Damien Millera6e3f012012-11-04 23:21:40 +1100528 u_int i, found;
529 int ret = -1;
530
531 if (*_methods == '\0') {
532 error("empty authentication method list");
533 return -1;
534 }
535 omethods = methods = xstrdup(_methods);
536 while ((method = strsep(&methods, ",")) != NULL) {
537 for (found = i = 0; !found && authmethods[i] != NULL; i++) {
Damien Miller91a55f22013-04-23 15:18:10 +1000538 if ((p = strchr(method, ':')) != NULL)
539 *p = '\0';
Damien Millera6e3f012012-11-04 23:21:40 +1100540 if (strcmp(method, authmethods[i]->name) != 0)
541 continue;
542 if (need_enable) {
543 if (authmethods[i]->enabled == NULL ||
544 *(authmethods[i]->enabled) == 0) {
545 error("Disabled method \"%s\" in "
546 "AuthenticationMethods list \"%s\"",
547 method, _methods);
548 goto out;
549 }
550 }
551 found = 1;
552 break;
553 }
554 if (!found) {
555 error("Unknown authentication method \"%s\" in list",
556 method);
557 goto out;
558 }
559 }
560 ret = 0;
561 out:
562 free(omethods);
563 return ret;
564}
565
566/*
567 * Prune the AuthenticationMethods supplied in the configuration, removing
568 * any methods lists that include disabled methods. Note that this might
569 * leave authctxt->num_auth_methods == 0, even when multiple required auth
570 * has been requested. For this reason, all tests for whether multiple is
571 * enabled should consult options.num_auth_methods directly.
572 */
573int
574auth2_setup_methods_lists(Authctxt *authctxt)
575{
576 u_int i;
577
djm@openbsd.org4f0019a2019-03-25 22:34:52 +0000578 /* First, normalise away the "any" pseudo-method */
579 if (options.num_auth_methods == 1 &&
580 strcmp(options.auth_methods[0], "any") == 0) {
581 free(options.auth_methods[0]);
582 options.auth_methods[0] = NULL;
583 options.num_auth_methods = 0;
584 }
585
Damien Millera6e3f012012-11-04 23:21:40 +1100586 if (options.num_auth_methods == 0)
587 return 0;
588 debug3("%s: checking methods", __func__);
589 authctxt->auth_methods = xcalloc(options.num_auth_methods,
590 sizeof(*authctxt->auth_methods));
591 authctxt->num_auth_methods = 0;
592 for (i = 0; i < options.num_auth_methods; i++) {
593 if (auth2_methods_valid(options.auth_methods[i], 1) != 0) {
594 logit("Authentication methods list \"%s\" contains "
595 "disabled method, skipping",
596 options.auth_methods[i]);
597 continue;
598 }
599 debug("authentication methods list %d: %s",
600 authctxt->num_auth_methods, options.auth_methods[i]);
601 authctxt->auth_methods[authctxt->num_auth_methods++] =
602 xstrdup(options.auth_methods[i]);
603 }
604 if (authctxt->num_auth_methods == 0) {
605 error("No AuthenticationMethods left after eliminating "
606 "disabled methods");
607 return -1;
608 }
609 return 0;
610}
611
612static int
Damien Miller91a55f22013-04-23 15:18:10 +1000613list_starts_with(const char *methods, const char *method,
614 const char *submethod)
Damien Millera6e3f012012-11-04 23:21:40 +1100615{
616 size_t l = strlen(method);
Damien Miller91a55f22013-04-23 15:18:10 +1000617 int match;
618 const char *p;
Damien Millera6e3f012012-11-04 23:21:40 +1100619
620 if (strncmp(methods, method, l) != 0)
Damien Miller91a55f22013-04-23 15:18:10 +1000621 return MATCH_NONE;
622 p = methods + l;
623 match = MATCH_METHOD;
624 if (*p == ':') {
625 if (!submethod)
626 return MATCH_PARTIAL;
627 l = strlen(submethod);
628 p += 1;
629 if (strncmp(submethod, p, l))
630 return MATCH_NONE;
631 p += l;
632 match = MATCH_BOTH;
633 }
634 if (*p != ',' && *p != '\0')
635 return MATCH_NONE;
636 return match;
Damien Millera6e3f012012-11-04 23:21:40 +1100637}
638
639/*
640 * Remove method from the start of a comma-separated list of methods.
641 * Returns 0 if the list of methods did not start with that method or 1
642 * if it did.
643 */
644static int
Damien Miller91a55f22013-04-23 15:18:10 +1000645remove_method(char **methods, const char *method, const char *submethod)
Damien Millera6e3f012012-11-04 23:21:40 +1100646{
Damien Miller91a55f22013-04-23 15:18:10 +1000647 char *omethods = *methods, *p;
Damien Millera6e3f012012-11-04 23:21:40 +1100648 size_t l = strlen(method);
Damien Miller91a55f22013-04-23 15:18:10 +1000649 int match;
Damien Millera6e3f012012-11-04 23:21:40 +1100650
Damien Miller91a55f22013-04-23 15:18:10 +1000651 match = list_starts_with(omethods, method, submethod);
652 if (match != MATCH_METHOD && match != MATCH_BOTH)
Damien Millera6e3f012012-11-04 23:21:40 +1100653 return 0;
Damien Miller91a55f22013-04-23 15:18:10 +1000654 p = omethods + l;
655 if (submethod && match == MATCH_BOTH)
656 p += 1 + strlen(submethod); /* include colon */
657 if (*p == ',')
658 p++;
659 *methods = xstrdup(p);
Damien Millera6e3f012012-11-04 23:21:40 +1100660 free(omethods);
661 return 1;
662}
663
664/*
665 * Called after successful authentication. Will remove the successful method
666 * from the start of each list in which it occurs. If it was the last method
667 * in any list, then authentication is deemed successful.
668 * Returns 1 if the method completed any authentication list or 0 otherwise.
669 */
670int
Damien Miller91a55f22013-04-23 15:18:10 +1000671auth2_update_methods_lists(Authctxt *authctxt, const char *method,
672 const char *submethod)
Damien Millera6e3f012012-11-04 23:21:40 +1100673{
674 u_int i, found = 0;
675
676 debug3("%s: updating methods list after \"%s\"", __func__, method);
677 for (i = 0; i < authctxt->num_auth_methods; i++) {
Damien Miller91a55f22013-04-23 15:18:10 +1000678 if (!remove_method(&(authctxt->auth_methods[i]), method,
679 submethod))
Damien Millera6e3f012012-11-04 23:21:40 +1100680 continue;
681 found = 1;
682 if (*authctxt->auth_methods[i] == '\0') {
683 debug2("authentication methods list %d complete", i);
684 return 1;
685 }
686 debug3("authentication methods list %d remaining: \"%s\"",
687 i, authctxt->auth_methods[i]);
688 }
689 /* This should not happen, but would be bad if it did */
690 if (!found)
691 fatal("%s: method not in AuthenticationMethods", __func__);
692 return 0;
693}
694
djm@openbsd.org8f574952017-06-24 06:34:38 +0000695/* Reset method-specific information */
696void auth2_authctxt_reset_info(Authctxt *authctxt)
697{
698 sshkey_free(authctxt->auth_method_key);
699 free(authctxt->auth_method_info);
700 authctxt->auth_method_key = NULL;
701 authctxt->auth_method_info = NULL;
702}
703
704/* Record auth method-specific information for logs */
705void
706auth2_record_info(Authctxt *authctxt, const char *fmt, ...)
707{
708 va_list ap;
709 int i;
710
711 free(authctxt->auth_method_info);
712 authctxt->auth_method_info = NULL;
713
714 va_start(ap, fmt);
715 i = vasprintf(&authctxt->auth_method_info, fmt, ap);
716 va_end(ap);
717
deraadt@openbsd.orge8c97402019-06-28 05:44:09 +0000718 if (i == -1)
djm@openbsd.org8f574952017-06-24 06:34:38 +0000719 fatal("%s: vasprintf failed", __func__);
720}
721
722/*
723 * Records a public key used in authentication. This is used for logging
724 * and to ensure that the same key is not subsequently accepted again for
725 * multiple authentication.
726 */
727void
728auth2_record_key(Authctxt *authctxt, int authenticated,
729 const struct sshkey *key)
730{
731 struct sshkey **tmp, *dup;
732 int r;
733
djm@openbsd.org482d23b2018-09-13 02:08:33 +0000734 if ((r = sshkey_from_private(key, &dup)) != 0)
djm@openbsd.org8f574952017-06-24 06:34:38 +0000735 fatal("%s: copy key: %s", __func__, ssh_err(r));
736 sshkey_free(authctxt->auth_method_key);
737 authctxt->auth_method_key = dup;
738
739 if (!authenticated)
740 return;
741
742 /* If authenticated, make sure we don't accept this key again */
djm@openbsd.org482d23b2018-09-13 02:08:33 +0000743 if ((r = sshkey_from_private(key, &dup)) != 0)
djm@openbsd.org8f574952017-06-24 06:34:38 +0000744 fatal("%s: copy key: %s", __func__, ssh_err(r));
745 if (authctxt->nprev_keys >= INT_MAX ||
746 (tmp = recallocarray(authctxt->prev_keys, authctxt->nprev_keys,
747 authctxt->nprev_keys + 1, sizeof(*authctxt->prev_keys))) == NULL)
748 fatal("%s: reallocarray failed", __func__);
749 authctxt->prev_keys = tmp;
750 authctxt->prev_keys[authctxt->nprev_keys] = dup;
751 authctxt->nprev_keys++;
752
753}
754
755/* Checks whether a key has already been previously used for authentication */
756int
757auth2_key_already_used(Authctxt *authctxt, const struct sshkey *key)
758{
759 u_int i;
760 char *fp;
761
762 for (i = 0; i < authctxt->nprev_keys; i++) {
763 if (sshkey_equal_public(key, authctxt->prev_keys[i])) {
764 fp = sshkey_fingerprint(authctxt->prev_keys[i],
765 options.fingerprint_hash, SSH_FP_DEFAULT);
766 debug3("%s: key already used: %s %s", __func__,
767 sshkey_type(authctxt->prev_keys[i]),
768 fp == NULL ? "UNKNOWN" : fp);
769 free(fp);
770 return 1;
771 }
772 }
773 return 0;
774}
775
776/*
777 * Updates authctxt->session_info with details of authentication. Should be
778 * whenever an authentication method succeeds.
779 */
780void
781auth2_update_session_info(Authctxt *authctxt, const char *method,
782 const char *submethod)
783{
784 int r;
785
786 if (authctxt->session_info == NULL) {
787 if ((authctxt->session_info = sshbuf_new()) == NULL)
788 fatal("%s: sshbuf_new", __func__);
789 }
790
791 /* Append method[/submethod] */
792 if ((r = sshbuf_putf(authctxt->session_info, "%s%s%s",
793 method, submethod == NULL ? "" : "/",
794 submethod == NULL ? "" : submethod)) != 0)
795 fatal("%s: append method: %s", __func__, ssh_err(r));
796
797 /* Append key if present */
798 if (authctxt->auth_method_key != NULL) {
799 if ((r = sshbuf_put_u8(authctxt->session_info, ' ')) != 0 ||
800 (r = sshkey_format_text(authctxt->auth_method_key,
801 authctxt->session_info)) != 0)
802 fatal("%s: append key: %s", __func__, ssh_err(r));
803 }
804
805 if (authctxt->auth_method_info != NULL) {
806 /* Ensure no ambiguity here */
807 if (strchr(authctxt->auth_method_info, '\n') != NULL)
808 fatal("%s: auth_method_info contains \\n", __func__);
809 if ((r = sshbuf_put_u8(authctxt->session_info, ' ')) != 0 ||
810 (r = sshbuf_putf(authctxt->session_info, "%s",
811 authctxt->auth_method_info)) != 0) {
812 fatal("%s: append method info: %s",
813 __func__, ssh_err(r));
814 }
815 }
816 if ((r = sshbuf_put_u8(authctxt->session_info, '\n')) != 0)
817 fatal("%s: append: %s", __func__, ssh_err(r));
818}
Damien Millera6e3f012012-11-04 23:21:40 +1100819