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djm@openbsd.orge661a862015-05-04 06:10:48 +00001/* $OpenBSD: sshconnect2.c,v 1.224 2015/05/04 06:10:48 djm Exp $ */
Damien Millereba71ba2000-04-29 23:57:08 +10002/*
3 * Copyright (c) 2000 Markus Friedl. All rights reserved.
Damien Miller01ed2272008-11-05 16:20:46 +11004 * Copyright (c) 2008 Damien Miller. All rights reserved.
Damien Millereba71ba2000-04-29 23:57:08 +10005 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
Damien Millereba71ba2000-04-29 23:57:08 +100014 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "includes.h"
Damien Miller2eb63402006-03-15 11:09:42 +110028
Damien Miller9cf6d072006-03-15 11:29:24 +110029#include <sys/types.h>
Damien Millerd7834352006-08-05 12:39:39 +100030#include <sys/socket.h>
Damien Miller9cf6d072006-03-15 11:29:24 +110031#include <sys/wait.h>
Damien Millerf17883e2006-03-15 11:45:54 +110032#include <sys/stat.h>
Damien Millereba71ba2000-04-29 23:57:08 +100033
Darren Tucker39972492006-07-12 22:22:46 +100034#include <errno.h>
Darren Tucker6e7fe1c2010-01-08 17:07:22 +110035#include <fcntl.h>
Darren Tuckerf520ea12007-05-20 15:11:33 +100036#include <netdb.h>
Damien Millerd7834352006-08-05 12:39:39 +100037#include <pwd.h>
38#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100039#include <stdarg.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100040#include <stdio.h>
Damien Millere3476ed2006-07-24 14:13:33 +100041#include <string.h>
Damien Miller1cdde6f2006-07-24 14:07:35 +100042#include <unistd.h>
Damien Miller63b4bcd2013-03-20 12:55:14 +110043#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
Damien Miller7ba0ca72008-07-17 18:57:06 +100044#include <vis.h>
Damien Miller2e28d862008-07-17 19:15:43 +100045#endif
Darren Tucker39972492006-07-12 22:22:46 +100046
Damien Miller9c617692003-05-14 14:31:11 +100047#include "openbsd-compat/sys-queue.h"
48
Damien Millerd7834352006-08-05 12:39:39 +100049#include "xmalloc.h"
Damien Millereba71ba2000-04-29 23:57:08 +100050#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000051#include "ssh2.h"
Damien Millereba71ba2000-04-29 23:57:08 +100052#include "buffer.h"
53#include "packet.h"
Damien Millereba71ba2000-04-29 23:57:08 +100054#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000055#include "cipher.h"
Damien Millerd7834352006-08-05 12:39:39 +100056#include "key.h"
Damien Millereba71ba2000-04-29 23:57:08 +100057#include "kex.h"
58#include "myproposal.h"
Damien Millereba71ba2000-04-29 23:57:08 +100059#include "sshconnect.h"
60#include "authfile.h"
Ben Lindstromdf221392001-03-29 00:36:16 +000061#include "dh.h"
Damien Millerad833b32000-08-23 10:46:23 +100062#include "authfd.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000063#include "log.h"
Darren Tuckere608ca22004-05-13 16:15:47 +100064#include "misc.h"
Damien Miller7acefbb2014-07-18 14:11:24 +100065#include "readconf.h"
Ben Lindstromb9be60a2001-03-11 01:49:19 +000066#include "match.h"
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000067#include "dispatch.h"
Ben Lindstrom5eabda32001-04-12 23:34:34 +000068#include "canohost.h"
Ben Lindstrom1bad2562002-06-06 19:57:33 +000069#include "msg.h"
70#include "pathnames.h"
Damien Miller6b4069a2006-06-13 13:05:15 +100071#include "uidswap.h"
Damien Millerd925dcd2010-12-01 12:21:51 +110072#include "hostfile.h"
djm@openbsd.org141efe42015-01-14 20:05:27 +000073#include "ssherr.h"
Damien Miller874d77b2000-10-14 16:23:11 +110074
Darren Tucker0efd1552003-08-26 11:49:55 +100075#ifdef GSSAPI
76#include "ssh-gss.h"
77#endif
78
Damien Millereba71ba2000-04-29 23:57:08 +100079/* import */
80extern char *client_version_string;
81extern char *server_version_string;
82extern Options options;
83
84/*
85 * SSH2 key exchange
86 */
87
Ben Lindstrom46c16222000-12-22 01:43:59 +000088u_char *session_id2 = NULL;
Darren Tucker502d3842003-06-28 12:38:01 +100089u_int session_id2_len = 0;
Damien Millereba71ba2000-04-29 23:57:08 +100090
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000091char *xxx_host;
92struct sockaddr *xxx_hostaddr;
93
Ben Lindstrombba81212001-06-25 05:01:22 +000094static int
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000095verify_host_key_callback(Key *hostkey, struct ssh *ssh)
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000096{
Ben Lindstromd6481ea2001-06-25 04:37:41 +000097 if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
Damien Miller59d9fb92001-10-10 15:03:11 +100098 fatal("Host key verification failed.");
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000099 return 0;
100}
101
Damien Millerd925dcd2010-12-01 12:21:51 +1100102static char *
103order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port)
104{
105 char *oavail, *avail, *first, *last, *alg, *hostname, *ret;
106 size_t maxlen;
107 struct hostkeys *hostkeys;
108 int ktype;
Damien Miller295ee632011-05-29 21:42:31 +1000109 u_int i;
Damien Millerd925dcd2010-12-01 12:21:51 +1100110
111 /* Find all hostkeys for this hostname */
112 get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL);
113 hostkeys = init_hostkeys();
Damien Miller295ee632011-05-29 21:42:31 +1000114 for (i = 0; i < options.num_user_hostfiles; i++)
115 load_hostkeys(hostkeys, hostname, options.user_hostfiles[i]);
116 for (i = 0; i < options.num_system_hostfiles; i++)
117 load_hostkeys(hostkeys, hostname, options.system_hostfiles[i]);
Damien Millerd925dcd2010-12-01 12:21:51 +1100118
119 oavail = avail = xstrdup(KEX_DEFAULT_PK_ALG);
120 maxlen = strlen(avail) + 1;
121 first = xmalloc(maxlen);
122 last = xmalloc(maxlen);
123 *first = *last = '\0';
124
125#define ALG_APPEND(to, from) \
126 do { \
127 if (*to != '\0') \
128 strlcat(to, ",", maxlen); \
129 strlcat(to, from, maxlen); \
130 } while (0)
131
132 while ((alg = strsep(&avail, ",")) && *alg != '\0') {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000133 if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC)
Damien Millerd925dcd2010-12-01 12:21:51 +1100134 fatal("%s: unknown alg %s", __func__, alg);
135 if (lookup_key_in_hostkeys_by_type(hostkeys,
djm@openbsd.org141efe42015-01-14 20:05:27 +0000136 sshkey_type_plain(ktype), NULL))
Damien Millerd925dcd2010-12-01 12:21:51 +1100137 ALG_APPEND(first, alg);
138 else
139 ALG_APPEND(last, alg);
140 }
141#undef ALG_APPEND
djm@openbsd.org35d60222015-01-18 13:33:34 +0000142 xasprintf(&ret, "%s%s%s", first,
143 (*first == '\0' || *last == '\0') ? "" : ",", last);
Damien Millerd925dcd2010-12-01 12:21:51 +1100144 if (*first != '\0')
145 debug3("%s: prefer hostkeyalgs: %s", __func__, first);
146
Darren Tuckera627d422013-06-02 07:31:17 +1000147 free(first);
148 free(last);
149 free(hostname);
150 free(oavail);
Damien Millerd925dcd2010-12-01 12:21:51 +1100151 free_hostkeys(hostkeys);
152
153 return ret;
154}
155
Damien Millereba71ba2000-04-29 23:57:08 +1000156void
Damien Millerd925dcd2010-12-01 12:21:51 +1100157ssh_kex2(char *host, struct sockaddr *hostaddr, u_short port)
Damien Miller874d77b2000-10-14 16:23:11 +1100158{
Damien Miller9235a032014-04-20 13:17:20 +1000159 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
markus@openbsd.org57d10cb2015-01-19 20:16:15 +0000160 struct kex *kex;
markus@openbsd.org57e783c2015-01-20 20:16:21 +0000161 int r;
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000162
163 xxx_host = host;
164 xxx_hostaddr = hostaddr;
Damien Miller874d77b2000-10-14 16:23:11 +1100165
Damien Millere39cacc2000-11-29 12:18:44 +1100166 if (options.ciphers == (char *)-1) {
Damien Miller996acd22003-04-09 20:59:48 +1000167 logit("No valid ciphers for protocol version 2 given, using defaults.");
Damien Millere39cacc2000-11-29 12:18:44 +1100168 options.ciphers = NULL;
Damien Miller874d77b2000-10-14 16:23:11 +1100169 }
170 if (options.ciphers != NULL) {
171 myproposal[PROPOSAL_ENC_ALGS_CTOS] =
172 myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
173 }
Damien Millera0ff4662001-03-30 10:49:35 +1000174 myproposal[PROPOSAL_ENC_ALGS_CTOS] =
175 compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
176 myproposal[PROPOSAL_ENC_ALGS_STOC] =
177 compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]);
Damien Miller874d77b2000-10-14 16:23:11 +1100178 if (options.compression) {
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000179 myproposal[PROPOSAL_COMP_ALGS_CTOS] =
Damien Miller9786e6e2005-07-26 21:54:56 +1000180 myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none";
Damien Miller874d77b2000-10-14 16:23:11 +1100181 } else {
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000182 myproposal[PROPOSAL_COMP_ALGS_CTOS] =
Damien Miller9786e6e2005-07-26 21:54:56 +1000183 myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib";
Damien Miller874d77b2000-10-14 16:23:11 +1100184 }
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000185 if (options.macs != NULL) {
186 myproposal[PROPOSAL_MAC_ALGS_CTOS] =
187 myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
188 }
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000189 if (options.hostkeyalgorithms != NULL)
Damien Miller9f0f5c62001-12-21 14:45:46 +1100190 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
Damien Miller324541e2013-12-31 12:25:40 +1100191 compat_pkalg_proposal(options.hostkeyalgorithms);
Damien Millerd925dcd2010-12-01 12:21:51 +1100192 else {
193 /* Prefer algorithms that we already have keys for */
194 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
Damien Miller324541e2013-12-31 12:25:40 +1100195 compat_pkalg_proposal(
196 order_hostkeyalgs(host, hostaddr, port));
Damien Millerd925dcd2010-12-01 12:21:51 +1100197 }
Damien Millerd5f62bf2010-09-24 22:11:14 +1000198 if (options.kex_algorithms != NULL)
199 myproposal[PROPOSAL_KEX_ALGS] = options.kex_algorithms;
Damien Miller9395b282014-04-20 13:25:30 +1000200 myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(
201 myproposal[PROPOSAL_KEX_ALGS]);
Damien Miller874d77b2000-10-14 16:23:11 +1100202
Darren Tuckerc53c2af2013-05-16 20:28:16 +1000203 if (options.rekey_limit || options.rekey_interval)
204 packet_set_rekey_limits((u_int32_t)options.rekey_limit,
205 (time_t)options.rekey_interval);
Damien Millera5539d22003-04-09 20:50:06 +1000206
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000207 /* start key exchange */
markus@openbsd.org57e783c2015-01-20 20:16:21 +0000208 if ((r = kex_setup(active_state, myproposal)) != 0)
209 fatal("kex_setup: %s", ssh_err(r));
markus@openbsd.org57d10cb2015-01-19 20:16:15 +0000210 kex = active_state->kex;
Damien Miller1f0311c2014-05-15 14:24:09 +1000211#ifdef WITH_OPENSSL
Damien Miller8e7fb332003-02-24 12:03:03 +1100212 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
Damien Millerf675fc42004-06-15 10:30:09 +1000213 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
Damien Miller8e7fb332003-02-24 12:03:03 +1100214 kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
Damien Millera63128d2006-03-15 12:08:28 +1100215 kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
Darren Tuckerf2004cd2015-02-23 05:04:21 +1100216# ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +1000217 kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
Darren Tuckerf2004cd2015-02-23 05:04:21 +1100218# endif
Damien Miller1f0311c2014-05-15 14:24:09 +1000219#endif
Damien Miller1e124262013-11-04 08:26:52 +1100220 kex->kex[KEX_C25519_SHA256] = kexc25519_client;
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000221 kex->client_version_string=client_version_string;
222 kex->server_version_string=server_version_string;
Ben Lindstromd6481ea2001-06-25 04:37:41 +0000223 kex->verify_host_key=&verify_host_key_callback;
Damien Miller874d77b2000-10-14 16:23:11 +1100224
markus@openbsd.org57d10cb2015-01-19 20:16:15 +0000225 dispatch_run(DISPATCH_BLOCK, &kex->done, active_state);
Damien Miller874d77b2000-10-14 16:23:11 +1100226
Darren Tucker36331b52010-01-08 16:50:41 +1100227 if (options.use_roaming && !kex->roaming) {
228 debug("Roaming not allowed by server");
229 options.use_roaming = 0;
230 }
231
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000232 session_id2 = kex->session_id;
233 session_id2_len = kex->session_id_len;
234
Damien Miller874d77b2000-10-14 16:23:11 +1100235#ifdef DEBUG_KEXDH
236 /* send 1st encrypted/maced/compressed message */
237 packet_start(SSH2_MSG_IGNORE);
238 packet_put_cstring("markus");
239 packet_send();
240 packet_write_wait();
241#endif
Damien Millereba71ba2000-04-29 23:57:08 +1000242}
Damien Millerb1715dc2000-05-30 13:44:51 +1000243
Damien Millereba71ba2000-04-29 23:57:08 +1000244/*
245 * Authenticate user
246 */
Damien Miller62cee002000-09-23 17:15:56 +1100247
djm@openbsd.org141efe42015-01-14 20:05:27 +0000248typedef struct cauthctxt Authctxt;
249typedef struct cauthmethod Authmethod;
Damien Miller280ecfb2003-05-14 13:46:00 +1000250typedef struct identity Identity;
251typedef struct idlist Idlist;
Damien Miller62cee002000-09-23 17:15:56 +1100252
Damien Miller280ecfb2003-05-14 13:46:00 +1000253struct identity {
254 TAILQ_ENTRY(identity) next;
djm@openbsd.org141efe42015-01-14 20:05:27 +0000255 int agent_fd; /* >=0 if agent supports key */
256 struct sshkey *key; /* public/private key */
Damien Miller280ecfb2003-05-14 13:46:00 +1000257 char *filename; /* comment for agent-only keys */
258 int tried;
259 int isprivate; /* key points to the private key */
Damien Miller5ceddc32013-02-15 12:18:32 +1100260 int userprovided;
Damien Miller280ecfb2003-05-14 13:46:00 +1000261};
262TAILQ_HEAD(idlist, identity);
Damien Miller62cee002000-09-23 17:15:56 +1100263
djm@openbsd.org141efe42015-01-14 20:05:27 +0000264struct cauthctxt {
Damien Miller62cee002000-09-23 17:15:56 +1100265 const char *server_user;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000266 const char *local_user;
Damien Miller62cee002000-09-23 17:15:56 +1100267 const char *host;
268 const char *service;
djm@openbsd.org141efe42015-01-14 20:05:27 +0000269 struct cauthmethod *method;
Damien Miller79442c02010-05-10 11:55:38 +1000270 sig_atomic_t success;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000271 char *authlist;
djm@openbsd.org141efe42015-01-14 20:05:27 +0000272 int attempt;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000273 /* pubkey */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000274 struct idlist keys;
275 int agent_fd;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000276 /* hostbased */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000277 Sensitive *sensitive;
djm@openbsd.org46347ed2015-01-30 11:43:14 +0000278 char *oktypes, *ktypes;
279 const char *active_ktype;
Ben Lindstrom7d199962001-09-12 18:29:00 +0000280 /* kbd-interactive */
281 int info_req_seen;
Darren Tucker0efd1552003-08-26 11:49:55 +1000282 /* generic */
283 void *methoddata;
Damien Miller62cee002000-09-23 17:15:56 +1100284};
djm@openbsd.org141efe42015-01-14 20:05:27 +0000285
286struct cauthmethod {
Damien Miller62cee002000-09-23 17:15:56 +1100287 char *name; /* string to compare against server's list */
288 int (*userauth)(Authctxt *authctxt);
Damien Miller01ed2272008-11-05 16:20:46 +1100289 void (*cleanup)(Authctxt *authctxt);
Damien Miller62cee002000-09-23 17:15:56 +1100290 int *enabled; /* flag in option struct that enables method */
291 int *batch_flag; /* flag in option struct that disables method */
292};
293
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000294int input_userauth_success(int, u_int32_t, void *);
295int input_userauth_success_unexpected(int, u_int32_t, void *);
296int input_userauth_failure(int, u_int32_t, void *);
297int input_userauth_banner(int, u_int32_t, void *);
298int input_userauth_error(int, u_int32_t, void *);
299int input_userauth_info_req(int, u_int32_t, void *);
300int input_userauth_pk_ok(int, u_int32_t, void *);
301int input_userauth_passwd_changereq(int, u_int32_t, void *);
Damien Miller874d77b2000-10-14 16:23:11 +1100302
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000303int userauth_none(Authctxt *);
304int userauth_pubkey(Authctxt *);
305int userauth_passwd(Authctxt *);
306int userauth_kbdint(Authctxt *);
307int userauth_hostbased(Authctxt *);
Damien Miller62cee002000-09-23 17:15:56 +1100308
Darren Tucker0efd1552003-08-26 11:49:55 +1000309#ifdef GSSAPI
310int userauth_gssapi(Authctxt *authctxt);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000311int input_gssapi_response(int type, u_int32_t, void *);
312int input_gssapi_token(int type, u_int32_t, void *);
313int input_gssapi_hash(int type, u_int32_t, void *);
314int input_gssapi_error(int, u_int32_t, void *);
315int input_gssapi_errtok(int, u_int32_t, void *);
Darren Tucker0efd1552003-08-26 11:49:55 +1000316#endif
317
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000318void userauth(Authctxt *, char *);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000319
Damien Miller280ecfb2003-05-14 13:46:00 +1000320static int sign_and_send_pubkey(Authctxt *, Identity *);
Damien Miller280ecfb2003-05-14 13:46:00 +1000321static void pubkey_prepare(Authctxt *);
322static void pubkey_cleanup(Authctxt *);
Damien Miller5ceddc32013-02-15 12:18:32 +1100323static Key *load_identity_file(char *, int);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000324
Ben Lindstrombba81212001-06-25 05:01:22 +0000325static Authmethod *authmethod_get(char *authlist);
326static Authmethod *authmethod_lookup(const char *name);
327static char *authmethods_get(void);
Damien Miller62cee002000-09-23 17:15:56 +1100328
329Authmethod authmethods[] = {
Darren Tucker0efd1552003-08-26 11:49:55 +1000330#ifdef GSSAPI
Damien Miller0425d402003-11-17 22:18:21 +1100331 {"gssapi-with-mic",
Darren Tucker0efd1552003-08-26 11:49:55 +1000332 userauth_gssapi,
Damien Miller01ed2272008-11-05 16:20:46 +1100333 NULL,
Darren Tucker0efd1552003-08-26 11:49:55 +1000334 &options.gss_authentication,
335 NULL},
336#endif
Ben Lindstrom1bfe2912001-06-05 19:37:25 +0000337 {"hostbased",
338 userauth_hostbased,
Damien Miller01ed2272008-11-05 16:20:46 +1100339 NULL,
Ben Lindstrom1bfe2912001-06-05 19:37:25 +0000340 &options.hostbased_authentication,
341 NULL},
Ben Lindstrom45350e82001-08-06 20:57:11 +0000342 {"publickey",
343 userauth_pubkey,
Damien Miller01ed2272008-11-05 16:20:46 +1100344 NULL,
Ben Lindstrom45350e82001-08-06 20:57:11 +0000345 &options.pubkey_authentication,
346 NULL},
Damien Miller874d77b2000-10-14 16:23:11 +1100347 {"keyboard-interactive",
348 userauth_kbdint,
Damien Miller01ed2272008-11-05 16:20:46 +1100349 NULL,
Damien Miller874d77b2000-10-14 16:23:11 +1100350 &options.kbd_interactive_authentication,
351 &options.batch_mode},
Ben Lindstrom45350e82001-08-06 20:57:11 +0000352 {"password",
353 userauth_passwd,
Damien Miller01ed2272008-11-05 16:20:46 +1100354 NULL,
Ben Lindstrom45350e82001-08-06 20:57:11 +0000355 &options.password_authentication,
356 &options.batch_mode},
Damien Miller874d77b2000-10-14 16:23:11 +1100357 {"none",
358 userauth_none,
359 NULL,
Damien Miller01ed2272008-11-05 16:20:46 +1100360 NULL,
Damien Miller874d77b2000-10-14 16:23:11 +1100361 NULL},
Damien Miller01ed2272008-11-05 16:20:46 +1100362 {NULL, NULL, NULL, NULL, NULL}
Damien Miller62cee002000-09-23 17:15:56 +1100363};
364
365void
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000366ssh_userauth2(const char *local_user, const char *server_user, char *host,
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000367 Sensitive *sensitive)
Damien Miller62cee002000-09-23 17:15:56 +1100368{
369 Authctxt authctxt;
370 int type;
Damien Miller62cee002000-09-23 17:15:56 +1100371
Ben Lindstrom551ea372001-06-05 18:56:16 +0000372 if (options.challenge_response_authentication)
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +0000373 options.kbd_interactive_authentication = 1;
374
Damien Miller62cee002000-09-23 17:15:56 +1100375 packet_start(SSH2_MSG_SERVICE_REQUEST);
376 packet_put_cstring("ssh-userauth");
377 packet_send();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000378 debug("SSH2_MSG_SERVICE_REQUEST sent");
Damien Miller62cee002000-09-23 17:15:56 +1100379 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100380 type = packet_read();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000381 if (type != SSH2_MSG_SERVICE_ACCEPT)
382 fatal("Server denied authentication request: %d", type);
Damien Miller62cee002000-09-23 17:15:56 +1100383 if (packet_remaining() > 0) {
Damien Millerdff50992002-01-22 23:16:32 +1100384 char *reply = packet_get_string(NULL);
Ben Lindstrom064496f2002-12-23 02:04:22 +0000385 debug2("service_accept: %s", reply);
Darren Tuckera627d422013-06-02 07:31:17 +1000386 free(reply);
Damien Miller62cee002000-09-23 17:15:56 +1100387 } else {
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000388 debug2("buggy server: service_accept w/o service");
Damien Miller62cee002000-09-23 17:15:56 +1100389 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100390 packet_check_eom();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000391 debug("SSH2_MSG_SERVICE_ACCEPT received");
Damien Miller62cee002000-09-23 17:15:56 +1100392
Ben Lindstromb9be60a2001-03-11 01:49:19 +0000393 if (options.preferred_authentications == NULL)
394 options.preferred_authentications = authmethods_get();
395
Damien Miller62cee002000-09-23 17:15:56 +1100396 /* setup authentication context */
Ben Lindstrom7d199962001-09-12 18:29:00 +0000397 memset(&authctxt, 0, sizeof(authctxt));
Damien Miller280ecfb2003-05-14 13:46:00 +1000398 pubkey_prepare(&authctxt);
Damien Miller62cee002000-09-23 17:15:56 +1100399 authctxt.server_user = server_user;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000400 authctxt.local_user = local_user;
Damien Miller62cee002000-09-23 17:15:56 +1100401 authctxt.host = host;
402 authctxt.service = "ssh-connection"; /* service name */
403 authctxt.success = 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100404 authctxt.method = authmethod_lookup("none");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000405 authctxt.authlist = NULL;
Darren Tucker0efd1552003-08-26 11:49:55 +1000406 authctxt.methoddata = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000407 authctxt.sensitive = sensitive;
djm@openbsd.org46347ed2015-01-30 11:43:14 +0000408 authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL;
Ben Lindstrom7d199962001-09-12 18:29:00 +0000409 authctxt.info_req_seen = 0;
djm@openbsd.orgf14564c2015-01-15 11:04:36 +0000410 authctxt.agent_fd = -1;
Damien Miller874d77b2000-10-14 16:23:11 +1100411 if (authctxt.method == NULL)
412 fatal("ssh_userauth2: internal error: cannot send userauth none request");
Damien Miller62cee002000-09-23 17:15:56 +1100413
414 /* initial userauth request */
Damien Miller874d77b2000-10-14 16:23:11 +1100415 userauth_none(&authctxt);
Damien Miller62cee002000-09-23 17:15:56 +1100416
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000417 dispatch_init(&input_userauth_error);
Damien Miller62cee002000-09-23 17:15:56 +1100418 dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
419 dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000420 dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
Damien Miller62cee002000-09-23 17:15:56 +1100421 dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */
422
Damien Miller280ecfb2003-05-14 13:46:00 +1000423 pubkey_cleanup(&authctxt);
Damien Millerf842fcb2003-05-15 12:01:28 +1000424 dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
425
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000426 debug("Authentication succeeded (%s).", authctxt.method->name);
Damien Miller62cee002000-09-23 17:15:56 +1100427}
Damien Millerf842fcb2003-05-15 12:01:28 +1000428
Damien Miller62cee002000-09-23 17:15:56 +1100429void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000430userauth(Authctxt *authctxt, char *authlist)
431{
Damien Miller01ed2272008-11-05 16:20:46 +1100432 if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
433 authctxt->method->cleanup(authctxt);
434
Darren Tuckera627d422013-06-02 07:31:17 +1000435 free(authctxt->methoddata);
436 authctxt->methoddata = NULL;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000437 if (authlist == NULL) {
438 authlist = authctxt->authlist;
439 } else {
Darren Tuckera627d422013-06-02 07:31:17 +1000440 free(authctxt->authlist);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000441 authctxt->authlist = authlist;
442 }
443 for (;;) {
444 Authmethod *method = authmethod_get(authlist);
445 if (method == NULL)
446 fatal("Permission denied (%s).", authlist);
447 authctxt->method = method;
Damien Millerf842fcb2003-05-15 12:01:28 +1000448
449 /* reset the per method handler */
450 dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN,
451 SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
452
453 /* and try new method */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000454 if (method->userauth(authctxt) != 0) {
455 debug2("we sent a %s packet, wait for reply", method->name);
456 break;
457 } else {
458 debug2("we did not send a packet, disable method");
459 method->enabled = NULL;
460 }
461 }
462}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000463
Damien Millerf7475d72008-11-03 19:26:18 +1100464/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000465int
Damien Miller630d6f42002-01-22 23:17:30 +1100466input_userauth_error(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100467{
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000468 fatal("input_userauth_error: bad message during authentication: "
Damien Miller0dc1bef2005-07-17 17:22:45 +1000469 "type %d", type);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000470 return 0;
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000471}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000472
Damien Millerf7475d72008-11-03 19:26:18 +1100473/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000474int
Damien Miller630d6f42002-01-22 23:17:30 +1100475input_userauth_banner(int type, u_int32_t seq, void *ctxt)
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000476{
Damien Miller7ba0ca72008-07-17 18:57:06 +1000477 char *msg, *raw, *lang;
478 u_int len;
Darren Tucker79644822003-10-08 17:37:58 +1000479
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000480 debug3("input_userauth_banner");
Damien Miller7ba0ca72008-07-17 18:57:06 +1000481 raw = packet_get_string(&len);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000482 lang = packet_get_string(NULL);
Damien Millerc674d582008-11-03 19:16:57 +1100483 if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) {
Damien Miller7ba0ca72008-07-17 18:57:06 +1000484 if (len > 65536)
485 len = 65536;
Damien Millerc4d1b362008-11-03 19:22:09 +1100486 msg = xmalloc(len * 4 + 1); /* max expansion from strnvis() */
Darren Tucker0c348f52010-01-08 18:58:05 +1100487 strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL|VIS_NOSLASH);
Darren Tucker046dff22003-10-08 17:32:02 +1000488 fprintf(stderr, "%s", msg);
Darren Tuckera627d422013-06-02 07:31:17 +1000489 free(msg);
Damien Miller7ba0ca72008-07-17 18:57:06 +1000490 }
Darren Tuckera627d422013-06-02 07:31:17 +1000491 free(raw);
492 free(lang);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000493 return 0;
Damien Miller62cee002000-09-23 17:15:56 +1100494}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000495
Damien Millerf7475d72008-11-03 19:26:18 +1100496/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000497int
Damien Miller630d6f42002-01-22 23:17:30 +1100498input_userauth_success(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100499{
500 Authctxt *authctxt = ctxt;
Darren Tucker2f29a8c2009-10-24 11:47:58 +1100501
Damien Miller62cee002000-09-23 17:15:56 +1100502 if (authctxt == NULL)
503 fatal("input_userauth_success: no authentication context");
Darren Tuckera627d422013-06-02 07:31:17 +1000504 free(authctxt->authlist);
505 authctxt->authlist = NULL;
Darren Tucker2f29a8c2009-10-24 11:47:58 +1100506 if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
507 authctxt->method->cleanup(authctxt);
Darren Tuckera627d422013-06-02 07:31:17 +1000508 free(authctxt->methoddata);
509 authctxt->methoddata = NULL;
Damien Miller62cee002000-09-23 17:15:56 +1100510 authctxt->success = 1; /* break out */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000511 return 0;
Damien Miller62cee002000-09-23 17:15:56 +1100512}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000513
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000514int
Darren Tucker2f29a8c2009-10-24 11:47:58 +1100515input_userauth_success_unexpected(int type, u_int32_t seq, void *ctxt)
516{
517 Authctxt *authctxt = ctxt;
518
519 if (authctxt == NULL)
520 fatal("%s: no authentication context", __func__);
521
522 fatal("Unexpected authentication success during %s.",
523 authctxt->method->name);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000524 return 0;
Darren Tucker2f29a8c2009-10-24 11:47:58 +1100525}
526
Damien Millerf7475d72008-11-03 19:26:18 +1100527/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000528int
Damien Miller630d6f42002-01-22 23:17:30 +1100529input_userauth_failure(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100530{
Damien Miller62cee002000-09-23 17:15:56 +1100531 Authctxt *authctxt = ctxt;
532 char *authlist = NULL;
533 int partial;
Damien Miller62cee002000-09-23 17:15:56 +1100534
535 if (authctxt == NULL)
536 fatal("input_userauth_failure: no authentication context");
537
Damien Miller874d77b2000-10-14 16:23:11 +1100538 authlist = packet_get_string(NULL);
Damien Miller62cee002000-09-23 17:15:56 +1100539 partial = packet_get_char();
Damien Miller48b03fc2002-01-22 23:11:40 +1100540 packet_check_eom();
Damien Miller62cee002000-09-23 17:15:56 +1100541
Damien Miller62e9c4f2013-04-23 15:15:49 +1000542 if (partial != 0) {
Damien Miller996acd22003-04-09 20:59:48 +1000543 logit("Authenticated with partial success.");
Damien Miller62e9c4f2013-04-23 15:15:49 +1000544 /* reset state */
545 pubkey_cleanup(authctxt);
546 pubkey_prepare(authctxt);
547 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000548 debug("Authentications that can continue: %s", authlist);
Damien Miller62cee002000-09-23 17:15:56 +1100549
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000550 userauth(authctxt, authlist);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000551 return 0;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000552}
Damien Millerf7475d72008-11-03 19:26:18 +1100553
554/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000555int
Damien Miller630d6f42002-01-22 23:17:30 +1100556input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000557{
558 Authctxt *authctxt = ctxt;
559 Key *key = NULL;
Damien Miller280ecfb2003-05-14 13:46:00 +1000560 Identity *id = NULL;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000561 Buffer b;
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000562 int pktype, sent = 0;
563 u_int alen, blen;
564 char *pkalg, *fp;
565 u_char *pkblob;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000566
567 if (authctxt == NULL)
568 fatal("input_userauth_pk_ok: no authentication context");
569 if (datafellows & SSH_BUG_PKOK) {
570 /* this is similar to SSH_BUG_PKAUTH */
571 debug2("input_userauth_pk_ok: SSH_BUG_PKOK");
572 pkblob = packet_get_string(&blen);
573 buffer_init(&b);
574 buffer_append(&b, pkblob, blen);
575 pkalg = buffer_get_string(&b, &alen);
576 buffer_free(&b);
577 } else {
578 pkalg = packet_get_string(&alen);
579 pkblob = packet_get_string(&blen);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000580 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100581 packet_check_eom();
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000582
Damien Miller280ecfb2003-05-14 13:46:00 +1000583 debug("Server accepts key: pkalg %s blen %u", pkalg, blen);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000584
Damien Miller280ecfb2003-05-14 13:46:00 +1000585 if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) {
586 debug("unknown pkalg %s", pkalg);
587 goto done;
588 }
589 if ((key = key_from_blob(pkblob, blen)) == NULL) {
590 debug("no key from blob. pkalg %s", pkalg);
591 goto done;
592 }
593 if (key->type != pktype) {
594 error("input_userauth_pk_ok: type mismatch "
595 "for decoded key (received %d, expected %d)",
596 key->type, pktype);
597 goto done;
598 }
djm@openbsd.org9ce86c92015-01-28 22:36:00 +0000599 if ((fp = sshkey_fingerprint(key, options.fingerprint_hash,
600 SSH_FP_DEFAULT)) == NULL)
601 goto done;
Damien Miller280ecfb2003-05-14 13:46:00 +1000602 debug2("input_userauth_pk_ok: fp %s", fp);
Darren Tuckera627d422013-06-02 07:31:17 +1000603 free(fp);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000604
Darren Tuckerd05b6012003-10-15 15:55:59 +1000605 /*
606 * search keys in the reverse order, because last candidate has been
607 * moved to the end of the queue. this also avoids confusion by
608 * duplicate keys
609 */
Damien Miller0b51a522004-04-20 20:07:19 +1000610 TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
Damien Miller280ecfb2003-05-14 13:46:00 +1000611 if (key_equal(key, id->key)) {
612 sent = sign_and_send_pubkey(authctxt, id);
613 break;
614 }
615 }
616done:
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000617 if (key != NULL)
618 key_free(key);
Darren Tuckera627d422013-06-02 07:31:17 +1000619 free(pkalg);
620 free(pkblob);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000621
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000622 /* try another method if we did not send a packet */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000623 if (sent == 0)
624 userauth(authctxt, NULL);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000625 return 0;
Damien Miller62cee002000-09-23 17:15:56 +1100626}
627
Darren Tucker0efd1552003-08-26 11:49:55 +1000628#ifdef GSSAPI
Damien Millera8e06ce2003-11-21 23:48:55 +1100629int
Darren Tucker0efd1552003-08-26 11:49:55 +1000630userauth_gssapi(Authctxt *authctxt)
631{
632 Gssctxt *gssctxt = NULL;
Darren Tucker56afe142003-11-03 20:06:14 +1100633 static gss_OID_set gss_supported = NULL;
Damien Millereccb9de2005-06-17 12:59:34 +1000634 static u_int mech = 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000635 OM_uint32 min;
636 int ok = 0;
637
638 /* Try one GSSAPI method at a time, rather than sending them all at
639 * once. */
640
Darren Tucker56afe142003-11-03 20:06:14 +1100641 if (gss_supported == NULL)
642 gss_indicate_mechs(&min, &gss_supported);
Darren Tucker0efd1552003-08-26 11:49:55 +1000643
644 /* Check to see if the mechanism is usable before we offer it */
Darren Tucker56afe142003-11-03 20:06:14 +1100645 while (mech < gss_supported->count && !ok) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000646 /* My DER encoding requires length<128 */
Darren Tucker56afe142003-11-03 20:06:14 +1100647 if (gss_supported->elements[mech].length < 128 &&
Damien Millera1cb9f32006-08-19 00:33:34 +1000648 ssh_gssapi_check_mechanism(&gssctxt,
649 &gss_supported->elements[mech], authctxt->host)) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000650 ok = 1; /* Mechanism works */
651 } else {
652 mech++;
653 }
654 }
655
Damien Millera1cb9f32006-08-19 00:33:34 +1000656 if (!ok)
Damien Millereccb9de2005-06-17 12:59:34 +1000657 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000658
659 authctxt->methoddata=(void *)gssctxt;
660
661 packet_start(SSH2_MSG_USERAUTH_REQUEST);
662 packet_put_cstring(authctxt->server_user);
663 packet_put_cstring(authctxt->service);
664 packet_put_cstring(authctxt->method->name);
665
666 packet_put_int(1);
667
Darren Tucker655a5e02003-11-03 20:09:03 +1100668 packet_put_int((gss_supported->elements[mech].length) + 2);
669 packet_put_char(SSH_GSS_OIDTYPE);
670 packet_put_char(gss_supported->elements[mech].length);
671 packet_put_raw(gss_supported->elements[mech].elements,
672 gss_supported->elements[mech].length);
Darren Tucker0efd1552003-08-26 11:49:55 +1000673
674 packet_send();
675
676 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
677 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
678 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
679 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
680
681 mech++; /* Move along to next candidate */
682
683 return 1;
684}
685
Damien Miller91c6aa42003-11-17 21:20:18 +1100686static OM_uint32
687process_gssapi_token(void *ctxt, gss_buffer_t recv_tok)
688{
689 Authctxt *authctxt = ctxt;
690 Gssctxt *gssctxt = authctxt->methoddata;
691 gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
Damien Millerda9984f2005-08-31 19:46:26 +1000692 gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
693 gss_buffer_desc gssbuf;
Damien Miller0425d402003-11-17 22:18:21 +1100694 OM_uint32 status, ms, flags;
695 Buffer b;
Damien Miller787b2ec2003-11-21 23:56:47 +1100696
Damien Miller91c6aa42003-11-17 21:20:18 +1100697 status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
Damien Miller0425d402003-11-17 22:18:21 +1100698 recv_tok, &send_tok, &flags);
Damien Miller91c6aa42003-11-17 21:20:18 +1100699
700 if (send_tok.length > 0) {
701 if (GSS_ERROR(status))
702 packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
703 else
704 packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
Damien Miller787b2ec2003-11-21 23:56:47 +1100705
Damien Miller91c6aa42003-11-17 21:20:18 +1100706 packet_put_string(send_tok.value, send_tok.length);
707 packet_send();
708 gss_release_buffer(&ms, &send_tok);
709 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100710
Damien Miller91c6aa42003-11-17 21:20:18 +1100711 if (status == GSS_S_COMPLETE) {
Damien Miller0425d402003-11-17 22:18:21 +1100712 /* send either complete or MIC, depending on mechanism */
713 if (!(flags & GSS_C_INTEG_FLAG)) {
714 packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
715 packet_send();
716 } else {
717 ssh_gssapi_buildmic(&b, authctxt->server_user,
718 authctxt->service, "gssapi-with-mic");
719
720 gssbuf.value = buffer_ptr(&b);
721 gssbuf.length = buffer_len(&b);
Damien Miller787b2ec2003-11-21 23:56:47 +1100722
Damien Miller0425d402003-11-17 22:18:21 +1100723 status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +1100724
Damien Miller0425d402003-11-17 22:18:21 +1100725 if (!GSS_ERROR(status)) {
726 packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC);
727 packet_put_string(mic.value, mic.length);
Damien Miller787b2ec2003-11-21 23:56:47 +1100728
Damien Miller0425d402003-11-17 22:18:21 +1100729 packet_send();
730 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100731
Damien Miller0425d402003-11-17 22:18:21 +1100732 buffer_free(&b);
733 gss_release_buffer(&ms, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +1100734 }
Damien Miller91c6aa42003-11-17 21:20:18 +1100735 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100736
Damien Miller91c6aa42003-11-17 21:20:18 +1100737 return status;
738}
739
Damien Millerf7475d72008-11-03 19:26:18 +1100740/* ARGSUSED */
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000741int
Darren Tucker0efd1552003-08-26 11:49:55 +1000742input_gssapi_response(int type, u_int32_t plen, void *ctxt)
743{
744 Authctxt *authctxt = ctxt;
745 Gssctxt *gssctxt;
Darren Tucker0efd1552003-08-26 11:49:55 +1000746 int oidlen;
747 char *oidv;
Darren Tucker0efd1552003-08-26 11:49:55 +1000748
749 if (authctxt == NULL)
750 fatal("input_gssapi_response: no authentication context");
751 gssctxt = authctxt->methoddata;
752
753 /* Setup our OID */
754 oidv = packet_get_string(&oidlen);
755
Darren Tucker655a5e02003-11-03 20:09:03 +1100756 if (oidlen <= 2 ||
757 oidv[0] != SSH_GSS_OIDTYPE ||
758 oidv[1] != oidlen - 2) {
Darren Tuckera627d422013-06-02 07:31:17 +1000759 free(oidv);
Darren Tucker655a5e02003-11-03 20:09:03 +1100760 debug("Badly encoded mechanism OID received");
761 userauth(authctxt, NULL);
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000762 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000763 }
764
Darren Tucker655a5e02003-11-03 20:09:03 +1100765 if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
766 fatal("Server returned different OID than expected");
767
Darren Tucker0efd1552003-08-26 11:49:55 +1000768 packet_check_eom();
769
Darren Tuckera627d422013-06-02 07:31:17 +1000770 free(oidv);
Darren Tucker0efd1552003-08-26 11:49:55 +1000771
Damien Miller91c6aa42003-11-17 21:20:18 +1100772 if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000773 /* Start again with next method on list */
774 debug("Trying to start again");
775 userauth(authctxt, NULL);
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000776 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000777 }
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000778 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000779}
780
Damien Millerf7475d72008-11-03 19:26:18 +1100781/* ARGSUSED */
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000782int
Darren Tucker0efd1552003-08-26 11:49:55 +1000783input_gssapi_token(int type, u_int32_t plen, void *ctxt)
784{
785 Authctxt *authctxt = ctxt;
Darren Tucker0efd1552003-08-26 11:49:55 +1000786 gss_buffer_desc recv_tok;
Damien Miller91c6aa42003-11-17 21:20:18 +1100787 OM_uint32 status;
Darren Tucker0efd1552003-08-26 11:49:55 +1000788 u_int slen;
789
790 if (authctxt == NULL)
791 fatal("input_gssapi_response: no authentication context");
Darren Tucker0efd1552003-08-26 11:49:55 +1000792
793 recv_tok.value = packet_get_string(&slen);
794 recv_tok.length = slen; /* safe typecast */
795
796 packet_check_eom();
797
Damien Miller91c6aa42003-11-17 21:20:18 +1100798 status = process_gssapi_token(ctxt, &recv_tok);
Darren Tucker0efd1552003-08-26 11:49:55 +1000799
Darren Tuckera627d422013-06-02 07:31:17 +1000800 free(recv_tok.value);
Darren Tucker0efd1552003-08-26 11:49:55 +1000801
802 if (GSS_ERROR(status)) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000803 /* Start again with the next method in the list */
804 userauth(authctxt, NULL);
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000805 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000806 }
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000807 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000808}
809
Damien Millerf7475d72008-11-03 19:26:18 +1100810/* ARGSUSED */
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000811int
Darren Tucker0efd1552003-08-26 11:49:55 +1000812input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
813{
814 Authctxt *authctxt = ctxt;
815 Gssctxt *gssctxt;
816 gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
817 gss_buffer_desc recv_tok;
Damien Millerd677ad12013-04-23 15:18:51 +1000818 OM_uint32 ms;
Darren Tucker600ad8d2003-08-26 12:10:48 +1000819 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +1000820
821 if (authctxt == NULL)
822 fatal("input_gssapi_response: no authentication context");
823 gssctxt = authctxt->methoddata;
824
Darren Tucker600ad8d2003-08-26 12:10:48 +1000825 recv_tok.value = packet_get_string(&len);
826 recv_tok.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +1000827
828 packet_check_eom();
829
830 /* Stick it into GSSAPI and see what it says */
Damien Millerd677ad12013-04-23 15:18:51 +1000831 (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
Damien Miller0dc1bef2005-07-17 17:22:45 +1000832 &recv_tok, &send_tok, NULL);
Darren Tucker0efd1552003-08-26 11:49:55 +1000833
Darren Tuckera627d422013-06-02 07:31:17 +1000834 free(recv_tok.value);
Darren Tucker0efd1552003-08-26 11:49:55 +1000835 gss_release_buffer(&ms, &send_tok);
836
837 /* Server will be returning a failed packet after this one */
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000838 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000839}
840
Damien Millerf7475d72008-11-03 19:26:18 +1100841/* ARGSUSED */
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000842int
Darren Tucker0efd1552003-08-26 11:49:55 +1000843input_gssapi_error(int type, u_int32_t plen, void *ctxt)
844{
Darren Tucker0efd1552003-08-26 11:49:55 +1000845 char *msg;
846 char *lang;
847
Damien Millerd677ad12013-04-23 15:18:51 +1000848 /* maj */(void)packet_get_int();
849 /* min */(void)packet_get_int();
Darren Tucker0efd1552003-08-26 11:49:55 +1000850 msg=packet_get_string(NULL);
851 lang=packet_get_string(NULL);
852
853 packet_check_eom();
854
Damien Miller15d72a02005-11-05 15:07:33 +1100855 debug("Server GSSAPI Error:\n%s", msg);
Darren Tuckera627d422013-06-02 07:31:17 +1000856 free(msg);
857 free(lang);
djm@openbsd.org12b5f502015-01-20 07:56:44 +0000858 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000859}
860#endif /* GSSAPI */
861
Damien Millereba71ba2000-04-29 23:57:08 +1000862int
Damien Miller874d77b2000-10-14 16:23:11 +1100863userauth_none(Authctxt *authctxt)
864{
865 /* initial userauth request */
866 packet_start(SSH2_MSG_USERAUTH_REQUEST);
867 packet_put_cstring(authctxt->server_user);
868 packet_put_cstring(authctxt->service);
869 packet_put_cstring(authctxt->method->name);
870 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +1100871 return 1;
872}
873
874int
Damien Miller62cee002000-09-23 17:15:56 +1100875userauth_passwd(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +1000876{
Damien Millere247cc42000-05-07 12:03:14 +1000877 static int attempt = 0;
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000878 char prompt[150];
Damien Millereba71ba2000-04-29 23:57:08 +1000879 char *password;
Darren Tuckerab791692010-01-08 18:48:02 +1100880 const char *host = options.host_key_alias ? options.host_key_alias :
881 authctxt->host;
Damien Millereba71ba2000-04-29 23:57:08 +1000882
Damien Millerd3a18572000-06-07 19:55:44 +1000883 if (attempt++ >= options.number_of_password_prompts)
Damien Millere247cc42000-05-07 12:03:14 +1000884 return 0;
885
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000886 if (attempt != 1)
Damien Millerd3a18572000-06-07 19:55:44 +1000887 error("Permission denied, please try again.");
888
Ben Lindstrom03df5bd2001-02-10 22:16:41 +0000889 snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
Darren Tuckerab791692010-01-08 18:48:02 +1100890 authctxt->server_user, host);
Damien Millereba71ba2000-04-29 23:57:08 +1000891 password = read_passphrase(prompt, 0);
892 packet_start(SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100893 packet_put_cstring(authctxt->server_user);
894 packet_put_cstring(authctxt->service);
Damien Miller874d77b2000-10-14 16:23:11 +1100895 packet_put_cstring(authctxt->method->name);
Damien Millereba71ba2000-04-29 23:57:08 +1000896 packet_put_char(0);
Ben Lindstrom5699c5f2001-03-05 06:17:49 +0000897 packet_put_cstring(password);
Damien Millera5103f42014-02-04 11:20:14 +1100898 explicit_bzero(password, strlen(password));
Darren Tuckera627d422013-06-02 07:31:17 +1000899 free(password);
Damien Miller9f643902001-11-12 11:02:52 +1100900 packet_add_padding(64);
Damien Millereba71ba2000-04-29 23:57:08 +1000901 packet_send();
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000902
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000903 dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000904 &input_userauth_passwd_changereq);
905
Damien Millereba71ba2000-04-29 23:57:08 +1000906 return 1;
907}
Damien Millerf7475d72008-11-03 19:26:18 +1100908
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000909/*
910 * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
911 */
Damien Millerf7475d72008-11-03 19:26:18 +1100912/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000913int
Tim Ricec8549622002-03-31 12:49:38 -0800914input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000915{
916 Authctxt *authctxt = ctxt;
917 char *info, *lang, *password = NULL, *retype = NULL;
918 char prompt[150];
Darren Tuckerab791692010-01-08 18:48:02 +1100919 const char *host = options.host_key_alias ? options.host_key_alias :
920 authctxt->host;
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000921
922 debug2("input_userauth_passwd_changereq");
923
924 if (authctxt == NULL)
925 fatal("input_userauth_passwd_changereq: "
926 "no authentication context");
927
928 info = packet_get_string(NULL);
929 lang = packet_get_string(NULL);
930 if (strlen(info) > 0)
Damien Miller996acd22003-04-09 20:59:48 +1000931 logit("%s", info);
Darren Tuckera627d422013-06-02 07:31:17 +1000932 free(info);
933 free(lang);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000934 packet_start(SSH2_MSG_USERAUTH_REQUEST);
935 packet_put_cstring(authctxt->server_user);
936 packet_put_cstring(authctxt->service);
937 packet_put_cstring(authctxt->method->name);
938 packet_put_char(1); /* additional info */
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000939 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000940 "Enter %.30s@%.128s's old password: ",
Darren Tuckerab791692010-01-08 18:48:02 +1100941 authctxt->server_user, host);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000942 password = read_passphrase(prompt, 0);
943 packet_put_cstring(password);
Damien Millera5103f42014-02-04 11:20:14 +1100944 explicit_bzero(password, strlen(password));
Darren Tuckera627d422013-06-02 07:31:17 +1000945 free(password);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000946 password = NULL;
947 while (password == NULL) {
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000948 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000949 "Enter %.30s@%.128s's new password: ",
Darren Tuckerab791692010-01-08 18:48:02 +1100950 authctxt->server_user, host);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000951 password = read_passphrase(prompt, RP_ALLOW_EOF);
952 if (password == NULL) {
953 /* bail out */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000954 return 0;
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000955 }
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000956 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000957 "Retype %.30s@%.128s's new password: ",
Darren Tuckerab791692010-01-08 18:48:02 +1100958 authctxt->server_user, host);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000959 retype = read_passphrase(prompt, 0);
960 if (strcmp(password, retype) != 0) {
Damien Millera5103f42014-02-04 11:20:14 +1100961 explicit_bzero(password, strlen(password));
Darren Tuckera627d422013-06-02 07:31:17 +1000962 free(password);
Damien Miller996acd22003-04-09 20:59:48 +1000963 logit("Mismatch; try again, EOF to quit.");
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000964 password = NULL;
965 }
Damien Millera5103f42014-02-04 11:20:14 +1100966 explicit_bzero(retype, strlen(retype));
Darren Tuckera627d422013-06-02 07:31:17 +1000967 free(retype);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000968 }
969 packet_put_cstring(password);
Damien Millera5103f42014-02-04 11:20:14 +1100970 explicit_bzero(password, strlen(password));
Darren Tuckera627d422013-06-02 07:31:17 +1000971 free(password);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000972 packet_add_padding(64);
973 packet_send();
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000974
975 dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000976 &input_userauth_passwd_changereq);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000977 return 0;
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000978}
Damien Millereba71ba2000-04-29 23:57:08 +1000979
Ben Lindstrombba81212001-06-25 05:01:22 +0000980static int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000981identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
982 const u_char *data, size_t datalen, u_int compat)
Damien Miller280ecfb2003-05-14 13:46:00 +1000983{
984 Key *prv;
985 int ret;
986
987 /* the agent supports this key */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000988 if (id->agent_fd)
989 return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp,
990 data, datalen, compat);
991
Damien Miller280ecfb2003-05-14 13:46:00 +1000992 /*
993 * we have already loaded the private key or
994 * the private key is stored in external hardware
995 */
Damien Miller86687062014-07-02 15:28:02 +1000996 if (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))
djm@openbsd.org141efe42015-01-14 20:05:27 +0000997 return (sshkey_sign(id->key, sigp, lenp, data, datalen,
998 compat));
Damien Miller280ecfb2003-05-14 13:46:00 +1000999 /* load the private key from the file */
Damien Miller5ceddc32013-02-15 12:18:32 +11001000 if ((prv = load_identity_file(id->filename, id->userprovided)) == NULL)
djm@openbsd.org141efe42015-01-14 20:05:27 +00001001 return (-1); /* XXX return decent error code */
1002 ret = sshkey_sign(prv, sigp, lenp, data, datalen, compat);
1003 sshkey_free(prv);
Damien Miller280ecfb2003-05-14 13:46:00 +10001004 return (ret);
1005}
1006
1007static int
1008sign_and_send_pubkey(Authctxt *authctxt, Identity *id)
Damien Millereba71ba2000-04-29 23:57:08 +10001009{
1010 Buffer b;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001011 u_char *blob, *signature;
djm@openbsd.org141efe42015-01-14 20:05:27 +00001012 u_int bloblen;
1013 size_t slen;
Darren Tucker502d3842003-06-28 12:38:01 +10001014 u_int skip = 0;
Damien Millerad833b32000-08-23 10:46:23 +10001015 int ret = -1;
Damien Miller874d77b2000-10-14 16:23:11 +11001016 int have_sig = 1;
Damien Miller4e270b02010-04-16 15:56:21 +10001017 char *fp;
Damien Millereba71ba2000-04-29 23:57:08 +10001018
djm@openbsd.org9ce86c92015-01-28 22:36:00 +00001019 if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
1020 SSH_FP_DEFAULT)) == NULL)
1021 return 0;
Damien Miller4e270b02010-04-16 15:56:21 +10001022 debug3("sign_and_send_pubkey: %s %s", key_type(id->key), fp);
Darren Tuckera627d422013-06-02 07:31:17 +10001023 free(fp);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001024
Damien Miller280ecfb2003-05-14 13:46:00 +10001025 if (key_to_blob(id->key, &blob, &bloblen) == 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001026 /* we cannot handle this key */
Ben Lindstromd121f612000-12-03 17:00:47 +00001027 debug3("sign_and_send_pubkey: cannot handle key");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001028 return 0;
1029 }
Damien Millereba71ba2000-04-29 23:57:08 +10001030 /* data to be signed */
1031 buffer_init(&b);
Damien Miller50a41ed2000-10-16 12:14:42 +11001032 if (datafellows & SSH_OLD_SESSIONID) {
Damien Miller6536c7d2000-06-22 21:32:31 +10001033 buffer_append(&b, session_id2, session_id2_len);
Kevin Stevesef4eea92001-02-05 12:42:17 +00001034 skip = session_id2_len;
Damien Miller50a41ed2000-10-16 12:14:42 +11001035 } else {
1036 buffer_put_string(&b, session_id2, session_id2_len);
1037 skip = buffer_len(&b);
Damien Miller6536c7d2000-06-22 21:32:31 +10001038 }
Damien Millereba71ba2000-04-29 23:57:08 +10001039 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +11001040 buffer_put_cstring(&b, authctxt->server_user);
Damien Miller30c3d422000-05-09 11:02:59 +10001041 buffer_put_cstring(&b,
Ben Lindstromd121f612000-12-03 17:00:47 +00001042 datafellows & SSH_BUG_PKSERVICE ?
Damien Miller30c3d422000-05-09 11:02:59 +10001043 "ssh-userauth" :
Damien Miller62cee002000-09-23 17:15:56 +11001044 authctxt->service);
Ben Lindstromd121f612000-12-03 17:00:47 +00001045 if (datafellows & SSH_BUG_PKAUTH) {
1046 buffer_put_char(&b, have_sig);
1047 } else {
1048 buffer_put_cstring(&b, authctxt->method->name);
1049 buffer_put_char(&b, have_sig);
Damien Miller280ecfb2003-05-14 13:46:00 +10001050 buffer_put_cstring(&b, key_ssh_name(id->key));
Ben Lindstromd121f612000-12-03 17:00:47 +00001051 }
Damien Millereba71ba2000-04-29 23:57:08 +10001052 buffer_put_string(&b, blob, bloblen);
Damien Millereba71ba2000-04-29 23:57:08 +10001053
1054 /* generate signature */
Damien Miller280ecfb2003-05-14 13:46:00 +10001055 ret = identity_sign(id, &signature, &slen,
djm@openbsd.org141efe42015-01-14 20:05:27 +00001056 buffer_ptr(&b), buffer_len(&b), datafellows);
1057 if (ret != 0) {
Darren Tuckera627d422013-06-02 07:31:17 +10001058 free(blob);
Damien Millerad833b32000-08-23 10:46:23 +10001059 buffer_free(&b);
1060 return 0;
1061 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001062#ifdef DEBUG_PK
Damien Millereba71ba2000-04-29 23:57:08 +10001063 buffer_dump(&b);
1064#endif
Ben Lindstromd121f612000-12-03 17:00:47 +00001065 if (datafellows & SSH_BUG_PKSERVICE) {
Damien Miller30c3d422000-05-09 11:02:59 +10001066 buffer_clear(&b);
1067 buffer_append(&b, session_id2, session_id2_len);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001068 skip = session_id2_len;
Damien Miller30c3d422000-05-09 11:02:59 +10001069 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +11001070 buffer_put_cstring(&b, authctxt->server_user);
1071 buffer_put_cstring(&b, authctxt->service);
Damien Miller874d77b2000-10-14 16:23:11 +11001072 buffer_put_cstring(&b, authctxt->method->name);
1073 buffer_put_char(&b, have_sig);
Ben Lindstromd121f612000-12-03 17:00:47 +00001074 if (!(datafellows & SSH_BUG_PKAUTH))
Damien Miller280ecfb2003-05-14 13:46:00 +10001075 buffer_put_cstring(&b, key_ssh_name(id->key));
Damien Miller30c3d422000-05-09 11:02:59 +10001076 buffer_put_string(&b, blob, bloblen);
1077 }
Darren Tuckera627d422013-06-02 07:31:17 +10001078 free(blob);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001079
Damien Millereba71ba2000-04-29 23:57:08 +10001080 /* append signature */
1081 buffer_put_string(&b, signature, slen);
Darren Tuckera627d422013-06-02 07:31:17 +10001082 free(signature);
Damien Millereba71ba2000-04-29 23:57:08 +10001083
1084 /* skip session id and packet type */
Damien Miller6536c7d2000-06-22 21:32:31 +10001085 if (buffer_len(&b) < skip + 1)
Damien Miller62cee002000-09-23 17:15:56 +11001086 fatal("userauth_pubkey: internal error");
Damien Miller6536c7d2000-06-22 21:32:31 +10001087 buffer_consume(&b, skip + 1);
Damien Millereba71ba2000-04-29 23:57:08 +10001088
1089 /* put remaining data from buffer into packet */
1090 packet_start(SSH2_MSG_USERAUTH_REQUEST);
1091 packet_put_raw(buffer_ptr(&b), buffer_len(&b));
1092 buffer_free(&b);
Damien Millereba71ba2000-04-29 23:57:08 +10001093 packet_send();
Damien Millerad833b32000-08-23 10:46:23 +10001094
1095 return 1;
Damien Miller994cf142000-07-21 10:19:44 +10001096}
1097
Ben Lindstrombba81212001-06-25 05:01:22 +00001098static int
Damien Miller280ecfb2003-05-14 13:46:00 +10001099send_pubkey_test(Authctxt *authctxt, Identity *id)
Damien Miller994cf142000-07-21 10:19:44 +10001100{
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001101 u_char *blob;
Ben Lindstromc58ab022002-02-26 18:15:09 +00001102 u_int bloblen, have_sig = 0;
Damien Miller994cf142000-07-21 10:19:44 +10001103
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001104 debug3("send_pubkey_test");
1105
Damien Miller280ecfb2003-05-14 13:46:00 +10001106 if (key_to_blob(id->key, &blob, &bloblen) == 0) {
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001107 /* we cannot handle this key */
1108 debug3("send_pubkey_test: cannot handle key");
Damien Miller994cf142000-07-21 10:19:44 +10001109 return 0;
1110 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001111 /* register callback for USERAUTH_PK_OK message */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001112 dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
Damien Miller994cf142000-07-21 10:19:44 +10001113
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001114 packet_start(SSH2_MSG_USERAUTH_REQUEST);
1115 packet_put_cstring(authctxt->server_user);
1116 packet_put_cstring(authctxt->service);
1117 packet_put_cstring(authctxt->method->name);
1118 packet_put_char(have_sig);
1119 if (!(datafellows & SSH_BUG_PKAUTH))
Damien Miller280ecfb2003-05-14 13:46:00 +10001120 packet_put_cstring(key_ssh_name(id->key));
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001121 packet_put_string(blob, bloblen);
Darren Tuckera627d422013-06-02 07:31:17 +10001122 free(blob);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001123 packet_send();
1124 return 1;
1125}
1126
Ben Lindstrombba81212001-06-25 05:01:22 +00001127static Key *
Damien Miller5ceddc32013-02-15 12:18:32 +11001128load_identity_file(char *filename, int userprovided)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001129{
1130 Key *private;
1131 char prompt[300], *passphrase;
djm@openbsd.orgf14564c2015-01-15 11:04:36 +00001132 int r, perm_ok = 0, quit = 0, i;
Ben Lindstrom329782e2001-03-10 17:08:59 +00001133 struct stat st;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001134
Ben Lindstrom329782e2001-03-10 17:08:59 +00001135 if (stat(filename, &st) < 0) {
Damien Miller5ceddc32013-02-15 12:18:32 +11001136 (userprovided ? logit : debug3)("no such identity: %s: %s",
1137 filename, strerror(errno));
Ben Lindstrom329782e2001-03-10 17:08:59 +00001138 return NULL;
1139 }
djm@openbsd.org141efe42015-01-14 20:05:27 +00001140 snprintf(prompt, sizeof prompt,
1141 "Enter passphrase for key '%.100s': ", filename);
1142 for (i = 0; i <= options.number_of_password_prompts; i++) {
1143 if (i == 0)
1144 passphrase = "";
1145 else {
Damien Miller62cee002000-09-23 17:15:56 +11001146 passphrase = read_passphrase(prompt, 0);
djm@openbsd.org141efe42015-01-14 20:05:27 +00001147 if (*passphrase == '\0') {
Damien Miller62cee002000-09-23 17:15:56 +11001148 debug2("no passphrase given, try next key");
djm@openbsd.org141efe42015-01-14 20:05:27 +00001149 free(passphrase);
1150 break;
Damien Miller62cee002000-09-23 17:15:56 +11001151 }
djm@openbsd.org141efe42015-01-14 20:05:27 +00001152 }
1153 switch ((r = sshkey_load_private_type(KEY_UNSPEC, filename,
1154 passphrase, &private, NULL, &perm_ok))) {
1155 case 0:
1156 break;
1157 case SSH_ERR_KEY_WRONG_PASSPHRASE:
1158 if (options.batch_mode) {
1159 quit = 1;
1160 break;
1161 }
djm@openbsd.orgf14564c2015-01-15 11:04:36 +00001162 if (i != 0)
1163 debug2("bad passphrase given, try again...");
djm@openbsd.org141efe42015-01-14 20:05:27 +00001164 break;
1165 case SSH_ERR_SYSTEM_ERROR:
1166 if (errno == ENOENT) {
1167 debug2("Load key \"%s\": %s",
1168 filename, ssh_err(r));
1169 quit = 1;
1170 break;
1171 }
1172 /* FALLTHROUGH */
1173 default:
1174 error("Load key \"%s\": %s", filename, ssh_err(r));
1175 quit = 1;
1176 break;
1177 }
1178 if (i > 0) {
Damien Millera5103f42014-02-04 11:20:14 +11001179 explicit_bzero(passphrase, strlen(passphrase));
Darren Tuckera627d422013-06-02 07:31:17 +10001180 free(passphrase);
Damien Miller62cee002000-09-23 17:15:56 +11001181 }
djm@openbsd.org141efe42015-01-14 20:05:27 +00001182 if (private != NULL || quit)
1183 break;
Damien Miller994cf142000-07-21 10:19:44 +10001184 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001185 return private;
1186}
1187
Damien Miller280ecfb2003-05-14 13:46:00 +10001188/*
1189 * try keys in the following order:
1190 * 1. agent keys that are found in the config file
1191 * 2. other agent keys
1192 * 3. keys that are only listed in the config file
1193 */
1194static void
1195pubkey_prepare(Authctxt *authctxt)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001196{
djm@openbsd.org141efe42015-01-14 20:05:27 +00001197 struct identity *id, *id2, *tmp;
1198 struct idlist agent, files, *preferred;
1199 struct sshkey *key;
1200 int agent_fd, i, r, found;
1201 size_t j;
1202 struct ssh_identitylist *idlist;
Damien Millerad833b32000-08-23 10:46:23 +10001203
Damien Miller280ecfb2003-05-14 13:46:00 +10001204 TAILQ_INIT(&agent); /* keys from the agent */
1205 TAILQ_INIT(&files); /* keys from the config file */
1206 preferred = &authctxt->keys;
1207 TAILQ_INIT(preferred); /* preferred order of keys */
1208
Damien Millercb6b68b2012-12-03 09:49:52 +11001209 /* list of keys stored in the filesystem and PKCS#11 */
Damien Miller280ecfb2003-05-14 13:46:00 +10001210 for (i = 0; i < options.num_identity_files; i++) {
1211 key = options.identity_keys[i];
1212 if (key && key->type == KEY_RSA1)
1213 continue;
Damien Miller0a80ca12010-02-27 07:55:05 +11001214 if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1215 continue;
Damien Miller280ecfb2003-05-14 13:46:00 +10001216 options.identity_keys[i] = NULL;
Damien Miller07d86be2006-03-26 14:19:21 +11001217 id = xcalloc(1, sizeof(*id));
Damien Miller280ecfb2003-05-14 13:46:00 +10001218 id->key = key;
1219 id->filename = xstrdup(options.identity_files[i]);
Darren Tucker19104782013-04-05 11:13:08 +11001220 id->userprovided = options.identity_file_userprovided[i];
Damien Miller280ecfb2003-05-14 13:46:00 +10001221 TAILQ_INSERT_TAIL(&files, id, next);
Damien Millerad833b32000-08-23 10:46:23 +10001222 }
Damien Millercb6b68b2012-12-03 09:49:52 +11001223 /* Prefer PKCS11 keys that are explicitly listed */
1224 TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
Damien Miller86687062014-07-02 15:28:02 +10001225 if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0)
Damien Millercb6b68b2012-12-03 09:49:52 +11001226 continue;
1227 found = 0;
1228 TAILQ_FOREACH(id2, &files, next) {
1229 if (id2->key == NULL ||
Damien Miller86687062014-07-02 15:28:02 +10001230 (id2->key->flags & SSHKEY_FLAG_EXT) == 0)
Damien Millercb6b68b2012-12-03 09:49:52 +11001231 continue;
djm@openbsd.org141efe42015-01-14 20:05:27 +00001232 if (sshkey_equal(id->key, id2->key)) {
Damien Millercb6b68b2012-12-03 09:49:52 +11001233 TAILQ_REMOVE(&files, id, next);
1234 TAILQ_INSERT_TAIL(preferred, id, next);
1235 found = 1;
1236 break;
1237 }
1238 }
1239 /* If IdentitiesOnly set and key not found then don't use it */
1240 if (!found && options.identities_only) {
1241 TAILQ_REMOVE(&files, id, next);
Damien Miller1d2c4562014-02-04 11:18:20 +11001242 explicit_bzero(id, sizeof(*id));
Damien Millercb6b68b2012-12-03 09:49:52 +11001243 free(id);
1244 }
1245 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001246 /* list of keys supported by the agent */
djm@openbsd.org141efe42015-01-14 20:05:27 +00001247 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
1248 if (r != SSH_ERR_AGENT_NOT_PRESENT)
1249 debug("%s: ssh_get_authentication_socket: %s",
1250 __func__, ssh_err(r));
1251 } else if ((r = ssh_fetch_identitylist(agent_fd, 2, &idlist)) != 0) {
1252 if (r != SSH_ERR_AGENT_NO_IDENTITIES)
1253 debug("%s: ssh_fetch_identitylist: %s",
1254 __func__, ssh_err(r));
1255 } else {
1256 for (j = 0; j < idlist->nkeys; j++) {
Damien Miller280ecfb2003-05-14 13:46:00 +10001257 found = 0;
1258 TAILQ_FOREACH(id, &files, next) {
djm@openbsd.org141efe42015-01-14 20:05:27 +00001259 /*
1260 * agent keys from the config file are
1261 * preferred
1262 */
1263 if (sshkey_equal(idlist->keys[j], id->key)) {
Damien Miller280ecfb2003-05-14 13:46:00 +10001264 TAILQ_REMOVE(&files, id, next);
1265 TAILQ_INSERT_TAIL(preferred, id, next);
djm@openbsd.org141efe42015-01-14 20:05:27 +00001266 id->agent_fd = agent_fd;
Damien Miller280ecfb2003-05-14 13:46:00 +10001267 found = 1;
1268 break;
1269 }
1270 }
Damien Millerbd394c32004-03-08 23:12:36 +11001271 if (!found && !options.identities_only) {
Damien Miller07d86be2006-03-26 14:19:21 +11001272 id = xcalloc(1, sizeof(*id));
djm@openbsd.org141efe42015-01-14 20:05:27 +00001273 /* XXX "steals" key/comment from idlist */
1274 id->key = idlist->keys[j];
1275 id->filename = idlist->comments[j];
1276 idlist->keys[j] = NULL;
1277 idlist->comments[j] = NULL;
1278 id->agent_fd = agent_fd;
Damien Miller280ecfb2003-05-14 13:46:00 +10001279 TAILQ_INSERT_TAIL(&agent, id, next);
1280 }
1281 }
djm@openbsd.org141efe42015-01-14 20:05:27 +00001282 ssh_free_identitylist(idlist);
Damien Miller280ecfb2003-05-14 13:46:00 +10001283 /* append remaining agent keys */
1284 for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1285 TAILQ_REMOVE(&agent, id, next);
1286 TAILQ_INSERT_TAIL(preferred, id, next);
1287 }
djm@openbsd.org141efe42015-01-14 20:05:27 +00001288 authctxt->agent_fd = agent_fd;
Damien Miller62cee002000-09-23 17:15:56 +11001289 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001290 /* append remaining keys from the config file */
1291 for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1292 TAILQ_REMOVE(&files, id, next);
1293 TAILQ_INSERT_TAIL(preferred, id, next);
1294 }
1295 TAILQ_FOREACH(id, preferred, next) {
Damien Miller5ceddc32013-02-15 12:18:32 +11001296 debug2("key: %s (%p),%s", id->filename, id->key,
1297 id->userprovided ? " explicit" : "");
Damien Miller280ecfb2003-05-14 13:46:00 +10001298 }
1299}
1300
1301static void
1302pubkey_cleanup(Authctxt *authctxt)
1303{
1304 Identity *id;
1305
djm@openbsd.org141efe42015-01-14 20:05:27 +00001306 if (authctxt->agent_fd != -1)
1307 ssh_close_authentication_socket(authctxt->agent_fd);
Damien Miller280ecfb2003-05-14 13:46:00 +10001308 for (id = TAILQ_FIRST(&authctxt->keys); id;
1309 id = TAILQ_FIRST(&authctxt->keys)) {
1310 TAILQ_REMOVE(&authctxt->keys, id, next);
1311 if (id->key)
djm@openbsd.org141efe42015-01-14 20:05:27 +00001312 sshkey_free(id->key);
Darren Tuckera627d422013-06-02 07:31:17 +10001313 free(id->filename);
1314 free(id);
Damien Miller280ecfb2003-05-14 13:46:00 +10001315 }
Damien Millereba71ba2000-04-29 23:57:08 +10001316}
1317
Damien Miller62cee002000-09-23 17:15:56 +11001318int
1319userauth_pubkey(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +10001320{
Damien Miller280ecfb2003-05-14 13:46:00 +10001321 Identity *id;
Damien Miller62cee002000-09-23 17:15:56 +11001322 int sent = 0;
Damien Millereba71ba2000-04-29 23:57:08 +10001323
Damien Miller280ecfb2003-05-14 13:46:00 +10001324 while ((id = TAILQ_FIRST(&authctxt->keys))) {
1325 if (id->tried++)
1326 return (0);
Darren Tuckerd05b6012003-10-15 15:55:59 +10001327 /* move key to the end of the queue */
Damien Miller280ecfb2003-05-14 13:46:00 +10001328 TAILQ_REMOVE(&authctxt->keys, id, next);
1329 TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1330 /*
1331 * send a test message if we have the public key. for
1332 * encrypted keys we cannot do this and have to load the
1333 * private key instead
1334 */
Damien Miller324541e2013-12-31 12:25:40 +11001335 if (id->key != NULL) {
1336 if (key_type_plain(id->key->type) == KEY_RSA &&
1337 (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1338 debug("Skipped %s key %s for RSA/MD5 server",
1339 key_type(id->key), id->filename);
1340 } else if (id->key->type != KEY_RSA1) {
1341 debug("Offering %s public key: %s",
1342 key_type(id->key), id->filename);
1343 sent = send_pubkey_test(authctxt, id);
1344 }
1345 } else {
Damien Miller280ecfb2003-05-14 13:46:00 +10001346 debug("Trying private key: %s", id->filename);
Damien Miller5ceddc32013-02-15 12:18:32 +11001347 id->key = load_identity_file(id->filename,
1348 id->userprovided);
Damien Miller280ecfb2003-05-14 13:46:00 +10001349 if (id->key != NULL) {
1350 id->isprivate = 1;
Damien Miller324541e2013-12-31 12:25:40 +11001351 if (key_type_plain(id->key->type) == KEY_RSA &&
1352 (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1353 debug("Skipped %s key %s for RSA/MD5 "
1354 "server", key_type(id->key),
1355 id->filename);
1356 } else {
1357 sent = sign_and_send_pubkey(
1358 authctxt, id);
1359 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001360 key_free(id->key);
1361 id->key = NULL;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001362 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001363 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001364 if (sent)
1365 return (sent);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001366 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001367 return (0);
Damien Miller62cee002000-09-23 17:15:56 +11001368}
Damien Millereba71ba2000-04-29 23:57:08 +10001369
Damien Miller874d77b2000-10-14 16:23:11 +11001370/*
1371 * Send userauth request message specifying keyboard-interactive method.
1372 */
1373int
1374userauth_kbdint(Authctxt *authctxt)
1375{
1376 static int attempt = 0;
1377
1378 if (attempt++ >= options.number_of_password_prompts)
1379 return 0;
Ben Lindstrom7d199962001-09-12 18:29:00 +00001380 /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1381 if (attempt > 1 && !authctxt->info_req_seen) {
1382 debug3("userauth_kbdint: disable: no info_req_seen");
1383 dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1384 return 0;
1385 }
Damien Miller874d77b2000-10-14 16:23:11 +11001386
1387 debug2("userauth_kbdint");
1388 packet_start(SSH2_MSG_USERAUTH_REQUEST);
1389 packet_put_cstring(authctxt->server_user);
1390 packet_put_cstring(authctxt->service);
1391 packet_put_cstring(authctxt->method->name);
1392 packet_put_cstring(""); /* lang */
1393 packet_put_cstring(options.kbd_interactive_devices ?
1394 options.kbd_interactive_devices : "");
1395 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +11001396
1397 dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1398 return 1;
1399}
1400
1401/*
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001402 * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
Damien Miller874d77b2000-10-14 16:23:11 +11001403 */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00001404int
Damien Miller630d6f42002-01-22 23:17:30 +11001405input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
Damien Miller874d77b2000-10-14 16:23:11 +11001406{
1407 Authctxt *authctxt = ctxt;
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001408 char *name, *inst, *lang, *prompt, *response;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001409 u_int num_prompts, i;
Damien Miller874d77b2000-10-14 16:23:11 +11001410 int echo = 0;
1411
1412 debug2("input_userauth_info_req");
1413
1414 if (authctxt == NULL)
1415 fatal("input_userauth_info_req: no authentication context");
1416
Ben Lindstrom7d199962001-09-12 18:29:00 +00001417 authctxt->info_req_seen = 1;
1418
Damien Miller874d77b2000-10-14 16:23:11 +11001419 name = packet_get_string(NULL);
1420 inst = packet_get_string(NULL);
1421 lang = packet_get_string(NULL);
Damien Miller874d77b2000-10-14 16:23:11 +11001422 if (strlen(name) > 0)
Damien Miller996acd22003-04-09 20:59:48 +10001423 logit("%s", name);
Damien Miller874d77b2000-10-14 16:23:11 +11001424 if (strlen(inst) > 0)
Damien Miller996acd22003-04-09 20:59:48 +10001425 logit("%s", inst);
Darren Tuckera627d422013-06-02 07:31:17 +10001426 free(name);
1427 free(inst);
1428 free(lang);
Damien Miller874d77b2000-10-14 16:23:11 +11001429
1430 num_prompts = packet_get_int();
1431 /*
1432 * Begin to build info response packet based on prompts requested.
1433 * We commit to providing the correct number of responses, so if
1434 * further on we run into a problem that prevents this, we have to
1435 * be sure and clean this up and send a correct error response.
1436 */
1437 packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
1438 packet_put_int(num_prompts);
1439
Ben Lindstrom551ea372001-06-05 18:56:16 +00001440 debug2("input_userauth_info_req: num_prompts %d", num_prompts);
Damien Miller874d77b2000-10-14 16:23:11 +11001441 for (i = 0; i < num_prompts; i++) {
1442 prompt = packet_get_string(NULL);
1443 echo = packet_get_char();
1444
Ben Lindstrom949974b2001-06-25 05:20:31 +00001445 response = read_passphrase(prompt, echo ? RP_ECHO : 0);
Damien Miller874d77b2000-10-14 16:23:11 +11001446
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001447 packet_put_cstring(response);
Damien Millera5103f42014-02-04 11:20:14 +11001448 explicit_bzero(response, strlen(response));
Darren Tuckera627d422013-06-02 07:31:17 +10001449 free(response);
1450 free(prompt);
Damien Miller874d77b2000-10-14 16:23:11 +11001451 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001452 packet_check_eom(); /* done with parsing incoming message. */
Damien Miller874d77b2000-10-14 16:23:11 +11001453
Damien Miller9f643902001-11-12 11:02:52 +11001454 packet_add_padding(64);
Damien Miller874d77b2000-10-14 16:23:11 +11001455 packet_send();
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00001456 return 0;
Damien Miller874d77b2000-10-14 16:23:11 +11001457}
Damien Miller62cee002000-09-23 17:15:56 +11001458
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001459static int
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001460ssh_keysign(struct sshkey *key, u_char **sigp, size_t *lenp,
1461 const u_char *data, size_t datalen)
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001462{
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001463 struct sshbuf *b;
Ben Lindstrom5206b952002-06-06 19:59:29 +00001464 struct stat st;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001465 pid_t pid;
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001466 int i, r, to[2], from[2], status, sock = packet_get_connection_in();
1467 u_char rversion = 0, version = 2;
1468 void (*osigchld)(int);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001469
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001470 *sigp = NULL;
1471 *lenp = 0;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001472
Ben Lindstrom5206b952002-06-06 19:59:29 +00001473 if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001474 error("%s: not installed: %s", __func__, strerror(errno));
Ben Lindstrom5206b952002-06-06 19:59:29 +00001475 return -1;
1476 }
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001477 if (fflush(stdout) != 0) {
1478 error("%s: fflush: %s", __func__, strerror(errno));
1479 return -1;
1480 }
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001481 if (pipe(to) < 0) {
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001482 error("%s: pipe: %s", __func__, strerror(errno));
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001483 return -1;
1484 }
1485 if (pipe(from) < 0) {
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001486 error("%s: pipe: %s", __func__, strerror(errno));
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001487 return -1;
1488 }
1489 if ((pid = fork()) < 0) {
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001490 error("%s: fork: %s", __func__, strerror(errno));
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001491 return -1;
1492 }
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001493 osigchld = signal(SIGCHLD, SIG_DFL);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001494 if (pid == 0) {
Darren Tucker6e7fe1c2010-01-08 17:07:22 +11001495 /* keep the socket on exec */
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001496 fcntl(sock, F_SETFD, 0);
Damien Miller2e5fe882006-06-13 13:10:00 +10001497 permanently_drop_suid(getuid());
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001498 close(from[0]);
1499 if (dup2(from[1], STDOUT_FILENO) < 0)
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001500 fatal("%s: dup2: %s", __func__, strerror(errno));
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001501 close(to[1]);
1502 if (dup2(to[0], STDIN_FILENO) < 0)
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001503 fatal("%s: dup2: %s", __func__, strerror(errno));
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001504 close(from[1]);
1505 close(to[0]);
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001506 /* Close everything but stdio and the socket */
1507 for (i = STDERR_FILENO + 1; i < sock; i++)
1508 close(i);
1509 closefrom(sock + 1);
1510 debug3("%s: [child] pid=%ld, exec %s",
1511 __func__, (long)getpid(), _PATH_SSH_KEY_SIGN);
Ben Lindstrom4887da22002-06-06 20:05:57 +00001512 execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0);
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001513 fatal("%s: exec(%s): %s", __func__, _PATH_SSH_KEY_SIGN,
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001514 strerror(errno));
1515 }
1516 close(from[1]);
1517 close(to[0]);
1518
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001519 if ((b = sshbuf_new()) == NULL)
1520 fatal("%s: sshbuf_new failed", __func__);
1521 /* send # of sock, data to be signed */
1522 if ((r = sshbuf_put_u32(b, sock) != 0) ||
1523 (r = sshbuf_put_string(b, data, datalen)) != 0)
1524 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1525 if (ssh_msg_send(to[1], version, b) == -1)
1526 fatal("%s: couldn't send request", __func__);
1527 sshbuf_reset(b);
1528 r = ssh_msg_recv(from[0], b);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001529 close(from[0]);
1530 close(to[1]);
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001531 if (r < 0) {
1532 error("%s: no reply", __func__);
1533 goto fail;
1534 }
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001535
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001536 errno = 0;
1537 while (waitpid(pid, &status, 0) < 0) {
1538 if (errno != EINTR) {
1539 error("%s: waitpid %ld: %s",
1540 __func__, (long)pid, strerror(errno));
1541 goto fail;
1542 }
1543 }
1544 if (!WIFEXITED(status)) {
1545 error("%s: exited abnormally", __func__);
1546 goto fail;
1547 }
1548 if (WEXITSTATUS(status) != 0) {
1549 error("%s: exited with status %d",
1550 __func__, WEXITSTATUS(status));
1551 goto fail;
1552 }
1553 if ((r = sshbuf_get_u8(b, &rversion)) != 0) {
1554 error("%s: buffer error: %s", __func__, ssh_err(r));
1555 goto fail;
1556 }
1557 if (rversion != version) {
1558 error("%s: bad version", __func__);
1559 goto fail;
1560 }
1561 if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) {
1562 error("%s: buffer error: %s", __func__, ssh_err(r));
1563 fail:
1564 signal(SIGCHLD, osigchld);
1565 sshbuf_free(b);
Ben Lindstrom5206b952002-06-06 19:59:29 +00001566 return -1;
1567 }
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001568 signal(SIGCHLD, osigchld);
1569 sshbuf_free(b);
Ben Lindstrom5206b952002-06-06 19:59:29 +00001570
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001571 return 0;
1572}
1573
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001574int
1575userauth_hostbased(Authctxt *authctxt)
1576{
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001577 struct ssh *ssh = active_state;
1578 struct sshkey *private = NULL;
1579 struct sshbuf *b = NULL;
Ben Lindstrom671388f2001-04-19 20:40:45 +00001580 const char *service;
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001581 u_char *sig = NULL, *keyblob = NULL;
1582 char *fp = NULL, *chost = NULL, *lname = NULL;
1583 size_t siglen = 0, keylen = 0;
1584 int i, r, success = 0;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001585
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001586 if (authctxt->ktypes == NULL) {
1587 authctxt->oktypes = xstrdup(options.hostbased_key_types);
1588 authctxt->ktypes = authctxt->oktypes;
1589 }
djm@openbsd.org1195f4c2015-01-08 10:14:08 +00001590
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001591 /*
1592 * Work through each listed type pattern in HostbasedKeyTypes,
1593 * trying each hostkey that matches the type in turn.
1594 */
1595 for (;;) {
1596 if (authctxt->active_ktype == NULL)
1597 authctxt->active_ktype = strsep(&authctxt->ktypes, ",");
1598 if (authctxt->active_ktype == NULL ||
1599 *authctxt->active_ktype == '\0')
1600 break;
1601 debug3("%s: trying key type %s", __func__,
1602 authctxt->active_ktype);
1603
1604 /* check for a useful key */
1605 private = NULL;
1606 for (i = 0; i < authctxt->sensitive->nkeys; i++) {
1607 if (authctxt->sensitive->keys[i] == NULL ||
1608 authctxt->sensitive->keys[i]->type == KEY_RSA1 ||
1609 authctxt->sensitive->keys[i]->type == KEY_UNSPEC)
1610 continue;
1611 if (match_pattern_list(
1612 sshkey_ssh_name(authctxt->sensitive->keys[i]),
djm@openbsd.orge661a862015-05-04 06:10:48 +00001613 authctxt->active_ktype, 0) != 1)
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001614 continue;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001615 /* we take and free the key */
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001616 private = authctxt->sensitive->keys[i];
1617 authctxt->sensitive->keys[i] = NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001618 break;
1619 }
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001620 /* Found one */
1621 if (private != NULL)
1622 break;
1623 /* No more keys of this type; advance */
1624 authctxt->active_ktype = NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001625 }
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001626 if (private == NULL) {
1627 free(authctxt->oktypes);
1628 authctxt->oktypes = authctxt->ktypes = NULL;
1629 authctxt->active_ktype = NULL;
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001630 debug("No more client hostkeys for hostbased authentication.");
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001631 goto out;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001632 }
djm@openbsd.org17bf3d82014-12-11 05:13:28 +00001633
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001634 if ((fp = sshkey_fingerprint(private, options.fingerprint_hash,
1635 SSH_FP_DEFAULT)) == NULL) {
1636 error("%s: sshkey_fingerprint failed", __func__);
1637 goto out;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001638 }
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001639 debug("%s: trying hostkey %s %s",
1640 __func__, sshkey_ssh_name(private), fp);
djm@openbsd.org17bf3d82014-12-11 05:13:28 +00001641
Damien Miller91c18472001-11-12 11:02:03 +11001642 /* figure out a name for the client host */
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001643 if ((lname = get_local_name(packet_get_connection_in())) == NULL) {
1644 error("%s: cannot get local ipaddr/name", __func__);
1645 goto out;
Damien Miller91c18472001-11-12 11:02:03 +11001646 }
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001647
1648 /* XXX sshbuf_put_stringf? */
1649 xasprintf(&chost, "%s.", lname);
1650 debug2("%s: chost %s", __func__, chost);
Damien Miller91c18472001-11-12 11:02:03 +11001651
Ben Lindstrom671388f2001-04-19 20:40:45 +00001652 service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
1653 authctxt->service;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001654
djm@openbsd.org46347ed2015-01-30 11:43:14 +00001655 /* construct data */
1656 if ((b = sshbuf_new()) == NULL) {
1657 error("%s: sshbuf_new failed", __func__);
1658 goto out;
1659 }
1660 if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) {
1661 error("%s: sshkey_to_blob: %s", __func__, ssh_err(r));
1662 goto out;
1663 }
1664 if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 ||
1665 (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1666 (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1667 (r = sshbuf_put_cstring(b, service)) != 0 ||
1668 (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1669 (r = sshbuf_put_cstring(b, key_ssh_name(private))) != 0 ||
1670 (r = sshbuf_put_string(b, keyblob, keylen)) != 0 ||
1671 (r = sshbuf_put_cstring(b, chost)) != 0 ||
1672 (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) {
1673 error("%s: buffer error: %s", __func__, ssh_err(r));
1674 goto out;
1675 }
1676
1677#ifdef DEBUG_PK
1678 sshbuf_dump(b, stderr);
1679#endif
1680 if (authctxt->sensitive->external_keysign)
1681 r = ssh_keysign(private, &sig, &siglen,
1682 sshbuf_ptr(b), sshbuf_len(b));
1683 else if ((r = sshkey_sign(private, &sig, &siglen,
1684 sshbuf_ptr(b), sshbuf_len(b), datafellows)) != 0)
1685 debug("%s: sshkey_sign: %s", __func__, ssh_err(r));
1686 if (r != 0) {
1687 error("sign using hostkey %s %s failed",
1688 sshkey_ssh_name(private), fp);
1689 goto out;
1690 }
1691 if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1692 (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1693 (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1694 (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1695 (r = sshpkt_put_cstring(ssh, key_ssh_name(private))) != 0 ||
1696 (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 ||
1697 (r = sshpkt_put_cstring(ssh, chost)) != 0 ||
1698 (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 ||
1699 (r = sshpkt_put_string(ssh, sig, siglen)) != 0 ||
1700 (r = sshpkt_send(ssh)) != 0) {
1701 error("%s: packet error: %s", __func__, ssh_err(r));
1702 goto out;
1703 }
1704 success = 1;
1705
1706 out:
1707 if (sig != NULL) {
1708 explicit_bzero(sig, siglen);
1709 free(sig);
1710 }
1711 free(keyblob);
1712 free(lname);
1713 free(fp);
1714 free(chost);
1715 sshkey_free(private);
1716 sshbuf_free(b);
1717
1718 return success;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001719}
1720
Damien Miller62cee002000-09-23 17:15:56 +11001721/* find auth method */
1722
Damien Miller62cee002000-09-23 17:15:56 +11001723/*
1724 * given auth method name, if configurable options permit this method fill
1725 * in auth_ident field and return true, otherwise return false.
1726 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001727static int
Damien Miller62cee002000-09-23 17:15:56 +11001728authmethod_is_enabled(Authmethod *method)
1729{
1730 if (method == NULL)
1731 return 0;
1732 /* return false if options indicate this method is disabled */
1733 if (method->enabled == NULL || *method->enabled == 0)
1734 return 0;
1735 /* return false if batch mode is enabled but method needs interactive mode */
1736 if (method->batch_flag != NULL && *method->batch_flag != 0)
1737 return 0;
1738 return 1;
1739}
1740
Ben Lindstrombba81212001-06-25 05:01:22 +00001741static Authmethod *
Damien Miller62cee002000-09-23 17:15:56 +11001742authmethod_lookup(const char *name)
1743{
1744 Authmethod *method = NULL;
1745 if (name != NULL)
1746 for (method = authmethods; method->name != NULL; method++)
1747 if (strcmp(name, method->name) == 0)
1748 return method;
1749 debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
1750 return NULL;
1751}
1752
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001753/* XXX internal state */
1754static Authmethod *current = NULL;
1755static char *supported = NULL;
1756static char *preferred = NULL;
Ben Lindstrom5c385522002-06-23 21:23:20 +00001757
Damien Miller62cee002000-09-23 17:15:56 +11001758/*
1759 * Given the authentication method list sent by the server, return the
1760 * next method we should try. If the server initially sends a nil list,
Ben Lindstroma3700052001-04-05 23:26:32 +00001761 * use a built-in default list.
Kevin Stevesef4eea92001-02-05 12:42:17 +00001762 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001763static Authmethod *
Damien Miller62cee002000-09-23 17:15:56 +11001764authmethod_get(char *authlist)
1765{
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001766 char *name = NULL;
Ben Lindstromc58ab022002-02-26 18:15:09 +00001767 u_int next;
Kevin Stevesef4eea92001-02-05 12:42:17 +00001768
Damien Miller62cee002000-09-23 17:15:56 +11001769 /* Use a suitable default if we're passed a nil list. */
1770 if (authlist == NULL || strlen(authlist) == 0)
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001771 authlist = options.preferred_authentications;
Damien Miller62cee002000-09-23 17:15:56 +11001772
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001773 if (supported == NULL || strcmp(authlist, supported) != 0) {
1774 debug3("start over, passed a different list %s", authlist);
Darren Tuckera627d422013-06-02 07:31:17 +10001775 free(supported);
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001776 supported = xstrdup(authlist);
1777 preferred = options.preferred_authentications;
1778 debug3("preferred %s", preferred);
1779 current = NULL;
1780 } else if (current != NULL && authmethod_is_enabled(current))
1781 return current;
Damien Millereba71ba2000-04-29 23:57:08 +10001782
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001783 for (;;) {
1784 if ((name = match_list(preferred, supported, &next)) == NULL) {
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001785 debug("No more authentication methods to try.");
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001786 current = NULL;
1787 return NULL;
Damien Miller874d77b2000-10-14 16:23:11 +11001788 }
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001789 preferred += next;
1790 debug3("authmethod_lookup %s", name);
1791 debug3("remaining preferred: %s", preferred);
1792 if ((current = authmethod_lookup(name)) != NULL &&
1793 authmethod_is_enabled(current)) {
1794 debug3("authmethod_is_enabled %s", name);
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001795 debug("Next authentication method: %s", name);
Darren Tuckera627d422013-06-02 07:31:17 +10001796 free(name);
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001797 return current;
1798 }
Darren Tuckere52a2602013-06-06 08:22:05 +10001799 free(name);
Damien Millereba71ba2000-04-29 23:57:08 +10001800 }
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001801}
Damien Miller62cee002000-09-23 17:15:56 +11001802
Ben Lindstrom79073822001-07-04 03:42:30 +00001803static char *
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001804authmethods_get(void)
1805{
1806 Authmethod *method = NULL;
Damien Miller0e3b8722002-01-22 23:26:38 +11001807 Buffer b;
1808 char *list;
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001809
Damien Miller0e3b8722002-01-22 23:26:38 +11001810 buffer_init(&b);
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001811 for (method = authmethods; method->name != NULL; method++) {
1812 if (authmethod_is_enabled(method)) {
Damien Miller0e3b8722002-01-22 23:26:38 +11001813 if (buffer_len(&b) > 0)
1814 buffer_append(&b, ",", 1);
1815 buffer_append(&b, method->name, strlen(method->name));
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001816 }
Damien Miller62cee002000-09-23 17:15:56 +11001817 }
Damien Miller0e3b8722002-01-22 23:26:38 +11001818 buffer_append(&b, "\0", 1);
1819 list = xstrdup(buffer_ptr(&b));
1820 buffer_free(&b);
1821 return list;
Damien Millereba71ba2000-04-29 23:57:08 +10001822}
Damien Miller01ed2272008-11-05 16:20:46 +11001823