blob: 4f96dcfc46a5a23fd470da984829d2e31f1c7161 [file] [log] [blame]
Damien Miller2e5fe882006-06-13 13:10:00 +10001/* $OpenBSD: sshconnect2.c,v 1.155 2006/06/08 14:45:49 markus Exp $ */
Damien Millereba71ba2000-04-29 23:57:08 +10002/*
3 * Copyright (c) 2000 Markus Friedl. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
Damien Millereba71ba2000-04-29 23:57:08 +100013 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "includes.h"
Damien Miller2eb63402006-03-15 11:09:42 +110027
Damien Miller9cf6d072006-03-15 11:29:24 +110028#include <sys/types.h>
29#include <sys/wait.h>
Damien Millerf17883e2006-03-15 11:45:54 +110030#include <sys/stat.h>
Damien Millereba71ba2000-04-29 23:57:08 +100031
Damien Miller9c617692003-05-14 14:31:11 +100032#include "openbsd-compat/sys-queue.h"
33
Damien Millereba71ba2000-04-29 23:57:08 +100034#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000035#include "ssh2.h"
Damien Millereba71ba2000-04-29 23:57:08 +100036#include "xmalloc.h"
Damien Millereba71ba2000-04-29 23:57:08 +100037#include "buffer.h"
38#include "packet.h"
Damien Millereba71ba2000-04-29 23:57:08 +100039#include "compat.h"
Damien Millereba71ba2000-04-29 23:57:08 +100040#include "bufaux.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000041#include "cipher.h"
Damien Millereba71ba2000-04-29 23:57:08 +100042#include "kex.h"
43#include "myproposal.h"
Damien Millereba71ba2000-04-29 23:57:08 +100044#include "sshconnect.h"
45#include "authfile.h"
Ben Lindstromdf221392001-03-29 00:36:16 +000046#include "dh.h"
Damien Millerad833b32000-08-23 10:46:23 +100047#include "authfd.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000048#include "log.h"
49#include "readconf.h"
Darren Tuckere608ca22004-05-13 16:15:47 +100050#include "misc.h"
Ben Lindstromb9be60a2001-03-11 01:49:19 +000051#include "match.h"
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000052#include "dispatch.h"
Ben Lindstrom5eabda32001-04-12 23:34:34 +000053#include "canohost.h"
Ben Lindstrom1bad2562002-06-06 19:57:33 +000054#include "msg.h"
55#include "pathnames.h"
Damien Miller6b4069a2006-06-13 13:05:15 +100056#include "uidswap.h"
Damien Miller874d77b2000-10-14 16:23:11 +110057
Darren Tucker0efd1552003-08-26 11:49:55 +100058#ifdef GSSAPI
59#include "ssh-gss.h"
60#endif
61
Damien Millereba71ba2000-04-29 23:57:08 +100062/* import */
63extern char *client_version_string;
64extern char *server_version_string;
65extern Options options;
66
67/*
68 * SSH2 key exchange
69 */
70
Ben Lindstrom46c16222000-12-22 01:43:59 +000071u_char *session_id2 = NULL;
Darren Tucker502d3842003-06-28 12:38:01 +100072u_int session_id2_len = 0;
Damien Millereba71ba2000-04-29 23:57:08 +100073
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000074char *xxx_host;
75struct sockaddr *xxx_hostaddr;
76
Ben Lindstromf28f6342001-04-04 02:03:04 +000077Kex *xxx_kex = NULL;
78
Ben Lindstrombba81212001-06-25 05:01:22 +000079static int
Ben Lindstromd6481ea2001-06-25 04:37:41 +000080verify_host_key_callback(Key *hostkey)
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000081{
Ben Lindstromd6481ea2001-06-25 04:37:41 +000082 if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
Damien Miller59d9fb92001-10-10 15:03:11 +100083 fatal("Host key verification failed.");
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000084 return 0;
85}
86
Damien Millereba71ba2000-04-29 23:57:08 +100087void
Damien Miller874d77b2000-10-14 16:23:11 +110088ssh_kex2(char *host, struct sockaddr *hostaddr)
89{
Damien Miller874d77b2000-10-14 16:23:11 +110090 Kex *kex;
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000091
92 xxx_host = host;
93 xxx_hostaddr = hostaddr;
Damien Miller874d77b2000-10-14 16:23:11 +110094
Damien Millere39cacc2000-11-29 12:18:44 +110095 if (options.ciphers == (char *)-1) {
Damien Miller996acd22003-04-09 20:59:48 +100096 logit("No valid ciphers for protocol version 2 given, using defaults.");
Damien Millere39cacc2000-11-29 12:18:44 +110097 options.ciphers = NULL;
Damien Miller874d77b2000-10-14 16:23:11 +110098 }
99 if (options.ciphers != NULL) {
100 myproposal[PROPOSAL_ENC_ALGS_CTOS] =
101 myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
102 }
Damien Millera0ff4662001-03-30 10:49:35 +1000103 myproposal[PROPOSAL_ENC_ALGS_CTOS] =
104 compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
105 myproposal[PROPOSAL_ENC_ALGS_STOC] =
106 compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]);
Damien Miller874d77b2000-10-14 16:23:11 +1100107 if (options.compression) {
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000108 myproposal[PROPOSAL_COMP_ALGS_CTOS] =
Damien Miller9786e6e2005-07-26 21:54:56 +1000109 myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none";
Damien Miller874d77b2000-10-14 16:23:11 +1100110 } else {
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000111 myproposal[PROPOSAL_COMP_ALGS_CTOS] =
Damien Miller9786e6e2005-07-26 21:54:56 +1000112 myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib";
Damien Miller874d77b2000-10-14 16:23:11 +1100113 }
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000114 if (options.macs != NULL) {
115 myproposal[PROPOSAL_MAC_ALGS_CTOS] =
116 myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
117 }
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000118 if (options.hostkeyalgorithms != NULL)
Damien Miller9f0f5c62001-12-21 14:45:46 +1100119 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000120 options.hostkeyalgorithms;
Damien Miller874d77b2000-10-14 16:23:11 +1100121
Damien Millera5539d22003-04-09 20:50:06 +1000122 if (options.rekey_limit)
123 packet_set_rekey_limit(options.rekey_limit);
124
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000125 /* start key exchange */
Ben Lindstrom238abf62001-04-04 17:52:53 +0000126 kex = kex_setup(myproposal);
Damien Miller8e7fb332003-02-24 12:03:03 +1100127 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
Damien Millerf675fc42004-06-15 10:30:09 +1000128 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
Damien Miller8e7fb332003-02-24 12:03:03 +1100129 kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
Damien Millera63128d2006-03-15 12:08:28 +1100130 kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000131 kex->client_version_string=client_version_string;
132 kex->server_version_string=server_version_string;
Ben Lindstromd6481ea2001-06-25 04:37:41 +0000133 kex->verify_host_key=&verify_host_key_callback;
Damien Miller874d77b2000-10-14 16:23:11 +1100134
Ben Lindstromf28f6342001-04-04 02:03:04 +0000135 xxx_kex = kex;
136
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000137 dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
Damien Miller874d77b2000-10-14 16:23:11 +1100138
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000139 session_id2 = kex->session_id;
140 session_id2_len = kex->session_id_len;
141
Damien Miller874d77b2000-10-14 16:23:11 +1100142#ifdef DEBUG_KEXDH
143 /* send 1st encrypted/maced/compressed message */
144 packet_start(SSH2_MSG_IGNORE);
145 packet_put_cstring("markus");
146 packet_send();
147 packet_write_wait();
148#endif
Damien Millereba71ba2000-04-29 23:57:08 +1000149}
Damien Millerb1715dc2000-05-30 13:44:51 +1000150
Damien Millereba71ba2000-04-29 23:57:08 +1000151/*
152 * Authenticate user
153 */
Damien Miller62cee002000-09-23 17:15:56 +1100154
155typedef struct Authctxt Authctxt;
156typedef struct Authmethod Authmethod;
Damien Miller280ecfb2003-05-14 13:46:00 +1000157typedef struct identity Identity;
158typedef struct idlist Idlist;
Damien Miller62cee002000-09-23 17:15:56 +1100159
Damien Miller280ecfb2003-05-14 13:46:00 +1000160struct identity {
161 TAILQ_ENTRY(identity) next;
162 AuthenticationConnection *ac; /* set if agent supports key */
163 Key *key; /* public/private key */
164 char *filename; /* comment for agent-only keys */
165 int tried;
166 int isprivate; /* key points to the private key */
167};
168TAILQ_HEAD(idlist, identity);
Damien Miller62cee002000-09-23 17:15:56 +1100169
170struct Authctxt {
171 const char *server_user;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000172 const char *local_user;
Damien Miller62cee002000-09-23 17:15:56 +1100173 const char *host;
174 const char *service;
Damien Miller62cee002000-09-23 17:15:56 +1100175 Authmethod *method;
Damien Miller874d77b2000-10-14 16:23:11 +1100176 int success;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000177 char *authlist;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000178 /* pubkey */
Damien Miller280ecfb2003-05-14 13:46:00 +1000179 Idlist keys;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000180 AuthenticationConnection *agent;
181 /* hostbased */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000182 Sensitive *sensitive;
Ben Lindstrom7d199962001-09-12 18:29:00 +0000183 /* kbd-interactive */
184 int info_req_seen;
Darren Tucker0efd1552003-08-26 11:49:55 +1000185 /* generic */
186 void *methoddata;
Damien Miller62cee002000-09-23 17:15:56 +1100187};
188struct Authmethod {
189 char *name; /* string to compare against server's list */
190 int (*userauth)(Authctxt *authctxt);
191 int *enabled; /* flag in option struct that enables method */
192 int *batch_flag; /* flag in option struct that disables method */
193};
194
Damien Miller630d6f42002-01-22 23:17:30 +1100195void input_userauth_success(int, u_int32_t, void *);
196void input_userauth_failure(int, u_int32_t, void *);
197void input_userauth_banner(int, u_int32_t, void *);
198void input_userauth_error(int, u_int32_t, void *);
199void input_userauth_info_req(int, u_int32_t, void *);
200void input_userauth_pk_ok(int, u_int32_t, void *);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000201void input_userauth_passwd_changereq(int, u_int32_t, void *);
Damien Miller874d77b2000-10-14 16:23:11 +1100202
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000203int userauth_none(Authctxt *);
204int userauth_pubkey(Authctxt *);
205int userauth_passwd(Authctxt *);
206int userauth_kbdint(Authctxt *);
207int userauth_hostbased(Authctxt *);
Damien Miller3ab496b2003-05-14 13:47:37 +1000208int userauth_kerberos(Authctxt *);
Damien Miller62cee002000-09-23 17:15:56 +1100209
Darren Tucker0efd1552003-08-26 11:49:55 +1000210#ifdef GSSAPI
211int userauth_gssapi(Authctxt *authctxt);
212void input_gssapi_response(int type, u_int32_t, void *);
213void input_gssapi_token(int type, u_int32_t, void *);
214void input_gssapi_hash(int type, u_int32_t, void *);
215void input_gssapi_error(int, u_int32_t, void *);
216void input_gssapi_errtok(int, u_int32_t, void *);
217#endif
218
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000219void userauth(Authctxt *, char *);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000220
Damien Miller280ecfb2003-05-14 13:46:00 +1000221static int sign_and_send_pubkey(Authctxt *, Identity *);
Damien Miller280ecfb2003-05-14 13:46:00 +1000222static void pubkey_prepare(Authctxt *);
223static void pubkey_cleanup(Authctxt *);
224static Key *load_identity_file(char *);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000225
Ben Lindstrombba81212001-06-25 05:01:22 +0000226static Authmethod *authmethod_get(char *authlist);
227static Authmethod *authmethod_lookup(const char *name);
228static char *authmethods_get(void);
Damien Miller62cee002000-09-23 17:15:56 +1100229
230Authmethod authmethods[] = {
Darren Tucker0efd1552003-08-26 11:49:55 +1000231#ifdef GSSAPI
Damien Miller0425d402003-11-17 22:18:21 +1100232 {"gssapi-with-mic",
Darren Tucker0efd1552003-08-26 11:49:55 +1000233 userauth_gssapi,
234 &options.gss_authentication,
235 NULL},
236#endif
Ben Lindstrom1bfe2912001-06-05 19:37:25 +0000237 {"hostbased",
238 userauth_hostbased,
239 &options.hostbased_authentication,
240 NULL},
Ben Lindstrom45350e82001-08-06 20:57:11 +0000241 {"publickey",
242 userauth_pubkey,
243 &options.pubkey_authentication,
244 NULL},
Damien Miller874d77b2000-10-14 16:23:11 +1100245 {"keyboard-interactive",
246 userauth_kbdint,
247 &options.kbd_interactive_authentication,
248 &options.batch_mode},
Ben Lindstrom45350e82001-08-06 20:57:11 +0000249 {"password",
250 userauth_passwd,
251 &options.password_authentication,
252 &options.batch_mode},
Damien Miller874d77b2000-10-14 16:23:11 +1100253 {"none",
254 userauth_none,
255 NULL,
256 NULL},
Damien Miller62cee002000-09-23 17:15:56 +1100257 {NULL, NULL, NULL, NULL}
258};
259
260void
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000261ssh_userauth2(const char *local_user, const char *server_user, char *host,
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000262 Sensitive *sensitive)
Damien Miller62cee002000-09-23 17:15:56 +1100263{
264 Authctxt authctxt;
265 int type;
Damien Miller62cee002000-09-23 17:15:56 +1100266
Ben Lindstrom551ea372001-06-05 18:56:16 +0000267 if (options.challenge_response_authentication)
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +0000268 options.kbd_interactive_authentication = 1;
269
Damien Miller62cee002000-09-23 17:15:56 +1100270 packet_start(SSH2_MSG_SERVICE_REQUEST);
271 packet_put_cstring("ssh-userauth");
272 packet_send();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000273 debug("SSH2_MSG_SERVICE_REQUEST sent");
Damien Miller62cee002000-09-23 17:15:56 +1100274 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100275 type = packet_read();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000276 if (type != SSH2_MSG_SERVICE_ACCEPT)
277 fatal("Server denied authentication request: %d", type);
Damien Miller62cee002000-09-23 17:15:56 +1100278 if (packet_remaining() > 0) {
Damien Millerdff50992002-01-22 23:16:32 +1100279 char *reply = packet_get_string(NULL);
Ben Lindstrom064496f2002-12-23 02:04:22 +0000280 debug2("service_accept: %s", reply);
Damien Miller62cee002000-09-23 17:15:56 +1100281 xfree(reply);
Damien Miller62cee002000-09-23 17:15:56 +1100282 } else {
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000283 debug2("buggy server: service_accept w/o service");
Damien Miller62cee002000-09-23 17:15:56 +1100284 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100285 packet_check_eom();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000286 debug("SSH2_MSG_SERVICE_ACCEPT received");
Damien Miller62cee002000-09-23 17:15:56 +1100287
Ben Lindstromb9be60a2001-03-11 01:49:19 +0000288 if (options.preferred_authentications == NULL)
289 options.preferred_authentications = authmethods_get();
290
Damien Miller62cee002000-09-23 17:15:56 +1100291 /* setup authentication context */
Ben Lindstrom7d199962001-09-12 18:29:00 +0000292 memset(&authctxt, 0, sizeof(authctxt));
Damien Miller280ecfb2003-05-14 13:46:00 +1000293 pubkey_prepare(&authctxt);
Damien Miller62cee002000-09-23 17:15:56 +1100294 authctxt.server_user = server_user;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000295 authctxt.local_user = local_user;
Damien Miller62cee002000-09-23 17:15:56 +1100296 authctxt.host = host;
297 authctxt.service = "ssh-connection"; /* service name */
298 authctxt.success = 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100299 authctxt.method = authmethod_lookup("none");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000300 authctxt.authlist = NULL;
Darren Tucker0efd1552003-08-26 11:49:55 +1000301 authctxt.methoddata = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000302 authctxt.sensitive = sensitive;
Ben Lindstrom7d199962001-09-12 18:29:00 +0000303 authctxt.info_req_seen = 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100304 if (authctxt.method == NULL)
305 fatal("ssh_userauth2: internal error: cannot send userauth none request");
Damien Miller62cee002000-09-23 17:15:56 +1100306
307 /* initial userauth request */
Damien Miller874d77b2000-10-14 16:23:11 +1100308 userauth_none(&authctxt);
Damien Miller62cee002000-09-23 17:15:56 +1100309
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000310 dispatch_init(&input_userauth_error);
Damien Miller62cee002000-09-23 17:15:56 +1100311 dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
312 dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000313 dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
Damien Miller62cee002000-09-23 17:15:56 +1100314 dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */
315
Damien Miller280ecfb2003-05-14 13:46:00 +1000316 pubkey_cleanup(&authctxt);
Damien Millerf842fcb2003-05-15 12:01:28 +1000317 dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
318
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000319 debug("Authentication succeeded (%s).", authctxt.method->name);
Damien Miller62cee002000-09-23 17:15:56 +1100320}
Damien Millerf842fcb2003-05-15 12:01:28 +1000321
Damien Miller62cee002000-09-23 17:15:56 +1100322void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000323userauth(Authctxt *authctxt, char *authlist)
324{
Darren Tucker0efd1552003-08-26 11:49:55 +1000325 if (authctxt->methoddata) {
326 xfree(authctxt->methoddata);
327 authctxt->methoddata = NULL;
328 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000329 if (authlist == NULL) {
330 authlist = authctxt->authlist;
331 } else {
332 if (authctxt->authlist)
333 xfree(authctxt->authlist);
334 authctxt->authlist = authlist;
335 }
336 for (;;) {
337 Authmethod *method = authmethod_get(authlist);
338 if (method == NULL)
339 fatal("Permission denied (%s).", authlist);
340 authctxt->method = method;
Damien Millerf842fcb2003-05-15 12:01:28 +1000341
342 /* reset the per method handler */
343 dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN,
344 SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
345
346 /* and try new method */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000347 if (method->userauth(authctxt) != 0) {
348 debug2("we sent a %s packet, wait for reply", method->name);
349 break;
350 } else {
351 debug2("we did not send a packet, disable method");
352 method->enabled = NULL;
353 }
354 }
355}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000356
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000357void
Damien Miller630d6f42002-01-22 23:17:30 +1100358input_userauth_error(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100359{
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000360 fatal("input_userauth_error: bad message during authentication: "
Damien Miller0dc1bef2005-07-17 17:22:45 +1000361 "type %d", type);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000362}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000363
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000364void
Damien Miller630d6f42002-01-22 23:17:30 +1100365input_userauth_banner(int type, u_int32_t seq, void *ctxt)
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000366{
367 char *msg, *lang;
Darren Tucker79644822003-10-08 17:37:58 +1000368
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000369 debug3("input_userauth_banner");
370 msg = packet_get_string(NULL);
371 lang = packet_get_string(NULL);
Darren Tucker046dff22003-10-08 17:32:02 +1000372 if (options.log_level > SYSLOG_LEVEL_QUIET)
373 fprintf(stderr, "%s", msg);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000374 xfree(msg);
375 xfree(lang);
Damien Miller62cee002000-09-23 17:15:56 +1100376}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000377
Damien Miller62cee002000-09-23 17:15:56 +1100378void
Damien Miller630d6f42002-01-22 23:17:30 +1100379input_userauth_success(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100380{
381 Authctxt *authctxt = ctxt;
382 if (authctxt == NULL)
383 fatal("input_userauth_success: no authentication context");
Darren Tucker79644822003-10-08 17:37:58 +1000384 if (authctxt->authlist) {
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000385 xfree(authctxt->authlist);
Darren Tucker79644822003-10-08 17:37:58 +1000386 authctxt->authlist = NULL;
387 }
388 if (authctxt->methoddata) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000389 xfree(authctxt->methoddata);
Darren Tucker79644822003-10-08 17:37:58 +1000390 authctxt->methoddata = NULL;
391 }
Damien Miller62cee002000-09-23 17:15:56 +1100392 authctxt->success = 1; /* break out */
393}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000394
Damien Miller62cee002000-09-23 17:15:56 +1100395void
Damien Miller630d6f42002-01-22 23:17:30 +1100396input_userauth_failure(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100397{
Damien Miller62cee002000-09-23 17:15:56 +1100398 Authctxt *authctxt = ctxt;
399 char *authlist = NULL;
400 int partial;
Damien Miller62cee002000-09-23 17:15:56 +1100401
402 if (authctxt == NULL)
403 fatal("input_userauth_failure: no authentication context");
404
Damien Miller874d77b2000-10-14 16:23:11 +1100405 authlist = packet_get_string(NULL);
Damien Miller62cee002000-09-23 17:15:56 +1100406 partial = packet_get_char();
Damien Miller48b03fc2002-01-22 23:11:40 +1100407 packet_check_eom();
Damien Miller62cee002000-09-23 17:15:56 +1100408
409 if (partial != 0)
Damien Miller996acd22003-04-09 20:59:48 +1000410 logit("Authenticated with partial success.");
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000411 debug("Authentications that can continue: %s", authlist);
Damien Miller62cee002000-09-23 17:15:56 +1100412
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000413 userauth(authctxt, authlist);
414}
415void
Damien Miller630d6f42002-01-22 23:17:30 +1100416input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000417{
418 Authctxt *authctxt = ctxt;
419 Key *key = NULL;
Damien Miller280ecfb2003-05-14 13:46:00 +1000420 Identity *id = NULL;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000421 Buffer b;
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000422 int pktype, sent = 0;
423 u_int alen, blen;
424 char *pkalg, *fp;
425 u_char *pkblob;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000426
427 if (authctxt == NULL)
428 fatal("input_userauth_pk_ok: no authentication context");
429 if (datafellows & SSH_BUG_PKOK) {
430 /* this is similar to SSH_BUG_PKAUTH */
431 debug2("input_userauth_pk_ok: SSH_BUG_PKOK");
432 pkblob = packet_get_string(&blen);
433 buffer_init(&b);
434 buffer_append(&b, pkblob, blen);
435 pkalg = buffer_get_string(&b, &alen);
436 buffer_free(&b);
437 } else {
438 pkalg = packet_get_string(&alen);
439 pkblob = packet_get_string(&blen);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000440 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100441 packet_check_eom();
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000442
Damien Miller280ecfb2003-05-14 13:46:00 +1000443 debug("Server accepts key: pkalg %s blen %u", pkalg, blen);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000444
Damien Miller280ecfb2003-05-14 13:46:00 +1000445 if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) {
446 debug("unknown pkalg %s", pkalg);
447 goto done;
448 }
449 if ((key = key_from_blob(pkblob, blen)) == NULL) {
450 debug("no key from blob. pkalg %s", pkalg);
451 goto done;
452 }
453 if (key->type != pktype) {
454 error("input_userauth_pk_ok: type mismatch "
455 "for decoded key (received %d, expected %d)",
456 key->type, pktype);
457 goto done;
458 }
459 fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
460 debug2("input_userauth_pk_ok: fp %s", fp);
461 xfree(fp);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000462
Darren Tuckerd05b6012003-10-15 15:55:59 +1000463 /*
464 * search keys in the reverse order, because last candidate has been
465 * moved to the end of the queue. this also avoids confusion by
466 * duplicate keys
467 */
Damien Miller0b51a522004-04-20 20:07:19 +1000468 TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
Damien Miller280ecfb2003-05-14 13:46:00 +1000469 if (key_equal(key, id->key)) {
470 sent = sign_and_send_pubkey(authctxt, id);
471 break;
472 }
473 }
474done:
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000475 if (key != NULL)
476 key_free(key);
477 xfree(pkalg);
478 xfree(pkblob);
479
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000480 /* try another method if we did not send a packet */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000481 if (sent == 0)
482 userauth(authctxt, NULL);
Damien Miller62cee002000-09-23 17:15:56 +1100483}
484
Darren Tucker0efd1552003-08-26 11:49:55 +1000485#ifdef GSSAPI
Damien Millera8e06ce2003-11-21 23:48:55 +1100486int
Darren Tucker0efd1552003-08-26 11:49:55 +1000487userauth_gssapi(Authctxt *authctxt)
488{
489 Gssctxt *gssctxt = NULL;
Darren Tucker56afe142003-11-03 20:06:14 +1100490 static gss_OID_set gss_supported = NULL;
Damien Millereccb9de2005-06-17 12:59:34 +1000491 static u_int mech = 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000492 OM_uint32 min;
493 int ok = 0;
494
495 /* Try one GSSAPI method at a time, rather than sending them all at
496 * once. */
497
Darren Tucker56afe142003-11-03 20:06:14 +1100498 if (gss_supported == NULL)
499 gss_indicate_mechs(&min, &gss_supported);
Darren Tucker0efd1552003-08-26 11:49:55 +1000500
501 /* Check to see if the mechanism is usable before we offer it */
Darren Tucker56afe142003-11-03 20:06:14 +1100502 while (mech < gss_supported->count && !ok) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000503 if (gssctxt)
504 ssh_gssapi_delete_ctx(&gssctxt);
505 ssh_gssapi_build_ctx(&gssctxt);
Darren Tucker56afe142003-11-03 20:06:14 +1100506 ssh_gssapi_set_oid(gssctxt, &gss_supported->elements[mech]);
Darren Tucker0efd1552003-08-26 11:49:55 +1000507
508 /* My DER encoding requires length<128 */
Darren Tucker56afe142003-11-03 20:06:14 +1100509 if (gss_supported->elements[mech].length < 128 &&
Darren Tucker0efd1552003-08-26 11:49:55 +1000510 !GSS_ERROR(ssh_gssapi_import_name(gssctxt,
511 authctxt->host))) {
512 ok = 1; /* Mechanism works */
513 } else {
514 mech++;
515 }
516 }
517
Damien Miller5790b592006-03-26 13:54:03 +1100518 if (!ok) {
519 ssh_gssapi_delete_ctx(&gssctxt);
Damien Millereccb9de2005-06-17 12:59:34 +1000520 return 0;
Damien Miller5790b592006-03-26 13:54:03 +1100521 }
Darren Tucker0efd1552003-08-26 11:49:55 +1000522
523 authctxt->methoddata=(void *)gssctxt;
524
525 packet_start(SSH2_MSG_USERAUTH_REQUEST);
526 packet_put_cstring(authctxt->server_user);
527 packet_put_cstring(authctxt->service);
528 packet_put_cstring(authctxt->method->name);
529
530 packet_put_int(1);
531
Darren Tucker655a5e02003-11-03 20:09:03 +1100532 packet_put_int((gss_supported->elements[mech].length) + 2);
533 packet_put_char(SSH_GSS_OIDTYPE);
534 packet_put_char(gss_supported->elements[mech].length);
535 packet_put_raw(gss_supported->elements[mech].elements,
536 gss_supported->elements[mech].length);
Darren Tucker0efd1552003-08-26 11:49:55 +1000537
538 packet_send();
539
540 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
541 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
542 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
543 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
544
545 mech++; /* Move along to next candidate */
546
547 return 1;
548}
549
Damien Miller91c6aa42003-11-17 21:20:18 +1100550static OM_uint32
551process_gssapi_token(void *ctxt, gss_buffer_t recv_tok)
552{
553 Authctxt *authctxt = ctxt;
554 Gssctxt *gssctxt = authctxt->methoddata;
555 gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
Damien Millerda9984f2005-08-31 19:46:26 +1000556 gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
557 gss_buffer_desc gssbuf;
Damien Miller0425d402003-11-17 22:18:21 +1100558 OM_uint32 status, ms, flags;
559 Buffer b;
Damien Miller787b2ec2003-11-21 23:56:47 +1100560
Damien Miller91c6aa42003-11-17 21:20:18 +1100561 status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
Damien Miller0425d402003-11-17 22:18:21 +1100562 recv_tok, &send_tok, &flags);
Damien Miller91c6aa42003-11-17 21:20:18 +1100563
564 if (send_tok.length > 0) {
565 if (GSS_ERROR(status))
566 packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
567 else
568 packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
Damien Miller787b2ec2003-11-21 23:56:47 +1100569
Damien Miller91c6aa42003-11-17 21:20:18 +1100570 packet_put_string(send_tok.value, send_tok.length);
571 packet_send();
572 gss_release_buffer(&ms, &send_tok);
573 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100574
Damien Miller91c6aa42003-11-17 21:20:18 +1100575 if (status == GSS_S_COMPLETE) {
Damien Miller0425d402003-11-17 22:18:21 +1100576 /* send either complete or MIC, depending on mechanism */
577 if (!(flags & GSS_C_INTEG_FLAG)) {
578 packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
579 packet_send();
580 } else {
581 ssh_gssapi_buildmic(&b, authctxt->server_user,
582 authctxt->service, "gssapi-with-mic");
583
584 gssbuf.value = buffer_ptr(&b);
585 gssbuf.length = buffer_len(&b);
Damien Miller787b2ec2003-11-21 23:56:47 +1100586
Damien Miller0425d402003-11-17 22:18:21 +1100587 status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +1100588
Damien Miller0425d402003-11-17 22:18:21 +1100589 if (!GSS_ERROR(status)) {
590 packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC);
591 packet_put_string(mic.value, mic.length);
Damien Miller787b2ec2003-11-21 23:56:47 +1100592
Damien Miller0425d402003-11-17 22:18:21 +1100593 packet_send();
594 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100595
Damien Miller0425d402003-11-17 22:18:21 +1100596 buffer_free(&b);
597 gss_release_buffer(&ms, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +1100598 }
Damien Miller91c6aa42003-11-17 21:20:18 +1100599 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100600
Damien Miller91c6aa42003-11-17 21:20:18 +1100601 return status;
602}
603
Darren Tucker0efd1552003-08-26 11:49:55 +1000604void
605input_gssapi_response(int type, u_int32_t plen, void *ctxt)
606{
607 Authctxt *authctxt = ctxt;
608 Gssctxt *gssctxt;
Darren Tucker0efd1552003-08-26 11:49:55 +1000609 int oidlen;
610 char *oidv;
Darren Tucker0efd1552003-08-26 11:49:55 +1000611
612 if (authctxt == NULL)
613 fatal("input_gssapi_response: no authentication context");
614 gssctxt = authctxt->methoddata;
615
616 /* Setup our OID */
617 oidv = packet_get_string(&oidlen);
618
Darren Tucker655a5e02003-11-03 20:09:03 +1100619 if (oidlen <= 2 ||
620 oidv[0] != SSH_GSS_OIDTYPE ||
621 oidv[1] != oidlen - 2) {
Damien Miller91c6aa42003-11-17 21:20:18 +1100622 xfree(oidv);
Darren Tucker655a5e02003-11-03 20:09:03 +1100623 debug("Badly encoded mechanism OID received");
624 userauth(authctxt, NULL);
Darren Tucker655a5e02003-11-03 20:09:03 +1100625 return;
Darren Tucker0efd1552003-08-26 11:49:55 +1000626 }
627
Darren Tucker655a5e02003-11-03 20:09:03 +1100628 if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
629 fatal("Server returned different OID than expected");
630
Darren Tucker0efd1552003-08-26 11:49:55 +1000631 packet_check_eom();
632
633 xfree(oidv);
634
Damien Miller91c6aa42003-11-17 21:20:18 +1100635 if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000636 /* Start again with next method on list */
637 debug("Trying to start again");
638 userauth(authctxt, NULL);
639 return;
640 }
Darren Tucker0efd1552003-08-26 11:49:55 +1000641}
642
643void
644input_gssapi_token(int type, u_int32_t plen, void *ctxt)
645{
646 Authctxt *authctxt = ctxt;
Darren Tucker0efd1552003-08-26 11:49:55 +1000647 gss_buffer_desc recv_tok;
Damien Miller91c6aa42003-11-17 21:20:18 +1100648 OM_uint32 status;
Darren Tucker0efd1552003-08-26 11:49:55 +1000649 u_int slen;
650
651 if (authctxt == NULL)
652 fatal("input_gssapi_response: no authentication context");
Darren Tucker0efd1552003-08-26 11:49:55 +1000653
654 recv_tok.value = packet_get_string(&slen);
655 recv_tok.length = slen; /* safe typecast */
656
657 packet_check_eom();
658
Damien Miller91c6aa42003-11-17 21:20:18 +1100659 status = process_gssapi_token(ctxt, &recv_tok);
Darren Tucker0efd1552003-08-26 11:49:55 +1000660
661 xfree(recv_tok.value);
662
663 if (GSS_ERROR(status)) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000664 /* Start again with the next method in the list */
665 userauth(authctxt, NULL);
666 return;
667 }
Darren Tucker0efd1552003-08-26 11:49:55 +1000668}
669
670void
671input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
672{
673 Authctxt *authctxt = ctxt;
674 Gssctxt *gssctxt;
675 gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
676 gss_buffer_desc recv_tok;
677 OM_uint32 status, ms;
Darren Tucker600ad8d2003-08-26 12:10:48 +1000678 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +1000679
680 if (authctxt == NULL)
681 fatal("input_gssapi_response: no authentication context");
682 gssctxt = authctxt->methoddata;
683
Darren Tucker600ad8d2003-08-26 12:10:48 +1000684 recv_tok.value = packet_get_string(&len);
685 recv_tok.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +1000686
687 packet_check_eom();
688
689 /* Stick it into GSSAPI and see what it says */
690 status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
Damien Miller0dc1bef2005-07-17 17:22:45 +1000691 &recv_tok, &send_tok, NULL);
Darren Tucker0efd1552003-08-26 11:49:55 +1000692
693 xfree(recv_tok.value);
694 gss_release_buffer(&ms, &send_tok);
695
696 /* Server will be returning a failed packet after this one */
697}
698
699void
700input_gssapi_error(int type, u_int32_t plen, void *ctxt)
701{
702 OM_uint32 maj, min;
703 char *msg;
704 char *lang;
705
706 maj=packet_get_int();
707 min=packet_get_int();
708 msg=packet_get_string(NULL);
709 lang=packet_get_string(NULL);
710
711 packet_check_eom();
712
Damien Miller15d72a02005-11-05 15:07:33 +1100713 debug("Server GSSAPI Error:\n%s", msg);
Darren Tucker0efd1552003-08-26 11:49:55 +1000714 xfree(msg);
715 xfree(lang);
716}
717#endif /* GSSAPI */
718
Damien Millereba71ba2000-04-29 23:57:08 +1000719int
Damien Miller874d77b2000-10-14 16:23:11 +1100720userauth_none(Authctxt *authctxt)
721{
722 /* initial userauth request */
723 packet_start(SSH2_MSG_USERAUTH_REQUEST);
724 packet_put_cstring(authctxt->server_user);
725 packet_put_cstring(authctxt->service);
726 packet_put_cstring(authctxt->method->name);
727 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +1100728 return 1;
729}
730
731int
Damien Miller62cee002000-09-23 17:15:56 +1100732userauth_passwd(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +1000733{
Damien Millere247cc42000-05-07 12:03:14 +1000734 static int attempt = 0;
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000735 char prompt[150];
Damien Millereba71ba2000-04-29 23:57:08 +1000736 char *password;
737
Damien Millerd3a18572000-06-07 19:55:44 +1000738 if (attempt++ >= options.number_of_password_prompts)
Damien Millere247cc42000-05-07 12:03:14 +1000739 return 0;
740
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000741 if (attempt != 1)
Damien Millerd3a18572000-06-07 19:55:44 +1000742 error("Permission denied, please try again.");
743
Ben Lindstrom03df5bd2001-02-10 22:16:41 +0000744 snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
Damien Miller62cee002000-09-23 17:15:56 +1100745 authctxt->server_user, authctxt->host);
Damien Millereba71ba2000-04-29 23:57:08 +1000746 password = read_passphrase(prompt, 0);
747 packet_start(SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100748 packet_put_cstring(authctxt->server_user);
749 packet_put_cstring(authctxt->service);
Damien Miller874d77b2000-10-14 16:23:11 +1100750 packet_put_cstring(authctxt->method->name);
Damien Millereba71ba2000-04-29 23:57:08 +1000751 packet_put_char(0);
Ben Lindstrom5699c5f2001-03-05 06:17:49 +0000752 packet_put_cstring(password);
Damien Millereba71ba2000-04-29 23:57:08 +1000753 memset(password, 0, strlen(password));
754 xfree(password);
Damien Miller9f643902001-11-12 11:02:52 +1100755 packet_add_padding(64);
Damien Millereba71ba2000-04-29 23:57:08 +1000756 packet_send();
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000757
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000758 dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000759 &input_userauth_passwd_changereq);
760
Damien Millereba71ba2000-04-29 23:57:08 +1000761 return 1;
762}
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000763/*
764 * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
765 */
766void
Tim Ricec8549622002-03-31 12:49:38 -0800767input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000768{
769 Authctxt *authctxt = ctxt;
770 char *info, *lang, *password = NULL, *retype = NULL;
771 char prompt[150];
772
773 debug2("input_userauth_passwd_changereq");
774
775 if (authctxt == NULL)
776 fatal("input_userauth_passwd_changereq: "
777 "no authentication context");
778
779 info = packet_get_string(NULL);
780 lang = packet_get_string(NULL);
781 if (strlen(info) > 0)
Damien Miller996acd22003-04-09 20:59:48 +1000782 logit("%s", info);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000783 xfree(info);
784 xfree(lang);
785 packet_start(SSH2_MSG_USERAUTH_REQUEST);
786 packet_put_cstring(authctxt->server_user);
787 packet_put_cstring(authctxt->service);
788 packet_put_cstring(authctxt->method->name);
789 packet_put_char(1); /* additional info */
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000790 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000791 "Enter %.30s@%.128s's old password: ",
792 authctxt->server_user, authctxt->host);
793 password = read_passphrase(prompt, 0);
794 packet_put_cstring(password);
795 memset(password, 0, strlen(password));
796 xfree(password);
797 password = NULL;
798 while (password == NULL) {
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000799 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000800 "Enter %.30s@%.128s's new password: ",
801 authctxt->server_user, authctxt->host);
802 password = read_passphrase(prompt, RP_ALLOW_EOF);
803 if (password == NULL) {
804 /* bail out */
805 return;
806 }
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000807 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000808 "Retype %.30s@%.128s's new password: ",
809 authctxt->server_user, authctxt->host);
810 retype = read_passphrase(prompt, 0);
811 if (strcmp(password, retype) != 0) {
812 memset(password, 0, strlen(password));
813 xfree(password);
Damien Miller996acd22003-04-09 20:59:48 +1000814 logit("Mismatch; try again, EOF to quit.");
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000815 password = NULL;
816 }
817 memset(retype, 0, strlen(retype));
818 xfree(retype);
819 }
820 packet_put_cstring(password);
821 memset(password, 0, strlen(password));
822 xfree(password);
823 packet_add_padding(64);
824 packet_send();
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000825
826 dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000827 &input_userauth_passwd_changereq);
828}
Damien Millereba71ba2000-04-29 23:57:08 +1000829
Ben Lindstrombba81212001-06-25 05:01:22 +0000830static int
Damien Miller280ecfb2003-05-14 13:46:00 +1000831identity_sign(Identity *id, u_char **sigp, u_int *lenp,
832 u_char *data, u_int datalen)
833{
834 Key *prv;
835 int ret;
836
837 /* the agent supports this key */
838 if (id->ac)
839 return (ssh_agent_sign(id->ac, id->key, sigp, lenp,
840 data, datalen));
841 /*
842 * we have already loaded the private key or
843 * the private key is stored in external hardware
844 */
845 if (id->isprivate || (id->key->flags & KEY_FLAG_EXT))
846 return (key_sign(id->key, sigp, lenp, data, datalen));
847 /* load the private key from the file */
848 if ((prv = load_identity_file(id->filename)) == NULL)
849 return (-1);
850 ret = key_sign(prv, sigp, lenp, data, datalen);
851 key_free(prv);
852 return (ret);
853}
854
855static int
856sign_and_send_pubkey(Authctxt *authctxt, Identity *id)
Damien Millereba71ba2000-04-29 23:57:08 +1000857{
858 Buffer b;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000859 u_char *blob, *signature;
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000860 u_int bloblen, slen;
Darren Tucker502d3842003-06-28 12:38:01 +1000861 u_int skip = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000862 int ret = -1;
Damien Miller874d77b2000-10-14 16:23:11 +1100863 int have_sig = 1;
Damien Millereba71ba2000-04-29 23:57:08 +1000864
Ben Lindstromd121f612000-12-03 17:00:47 +0000865 debug3("sign_and_send_pubkey");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000866
Damien Miller280ecfb2003-05-14 13:46:00 +1000867 if (key_to_blob(id->key, &blob, &bloblen) == 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100868 /* we cannot handle this key */
Ben Lindstromd121f612000-12-03 17:00:47 +0000869 debug3("sign_and_send_pubkey: cannot handle key");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100870 return 0;
871 }
Damien Millereba71ba2000-04-29 23:57:08 +1000872 /* data to be signed */
873 buffer_init(&b);
Damien Miller50a41ed2000-10-16 12:14:42 +1100874 if (datafellows & SSH_OLD_SESSIONID) {
Damien Miller6536c7d2000-06-22 21:32:31 +1000875 buffer_append(&b, session_id2, session_id2_len);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000876 skip = session_id2_len;
Damien Miller50a41ed2000-10-16 12:14:42 +1100877 } else {
878 buffer_put_string(&b, session_id2, session_id2_len);
879 skip = buffer_len(&b);
Damien Miller6536c7d2000-06-22 21:32:31 +1000880 }
Damien Millereba71ba2000-04-29 23:57:08 +1000881 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100882 buffer_put_cstring(&b, authctxt->server_user);
Damien Miller30c3d422000-05-09 11:02:59 +1000883 buffer_put_cstring(&b,
Ben Lindstromd121f612000-12-03 17:00:47 +0000884 datafellows & SSH_BUG_PKSERVICE ?
Damien Miller30c3d422000-05-09 11:02:59 +1000885 "ssh-userauth" :
Damien Miller62cee002000-09-23 17:15:56 +1100886 authctxt->service);
Ben Lindstromd121f612000-12-03 17:00:47 +0000887 if (datafellows & SSH_BUG_PKAUTH) {
888 buffer_put_char(&b, have_sig);
889 } else {
890 buffer_put_cstring(&b, authctxt->method->name);
891 buffer_put_char(&b, have_sig);
Damien Miller280ecfb2003-05-14 13:46:00 +1000892 buffer_put_cstring(&b, key_ssh_name(id->key));
Ben Lindstromd121f612000-12-03 17:00:47 +0000893 }
Damien Millereba71ba2000-04-29 23:57:08 +1000894 buffer_put_string(&b, blob, bloblen);
Damien Millereba71ba2000-04-29 23:57:08 +1000895
896 /* generate signature */
Damien Miller280ecfb2003-05-14 13:46:00 +1000897 ret = identity_sign(id, &signature, &slen,
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000898 buffer_ptr(&b), buffer_len(&b));
Damien Millerad833b32000-08-23 10:46:23 +1000899 if (ret == -1) {
900 xfree(blob);
901 buffer_free(&b);
902 return 0;
903 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100904#ifdef DEBUG_PK
Damien Millereba71ba2000-04-29 23:57:08 +1000905 buffer_dump(&b);
906#endif
Ben Lindstromd121f612000-12-03 17:00:47 +0000907 if (datafellows & SSH_BUG_PKSERVICE) {
Damien Miller30c3d422000-05-09 11:02:59 +1000908 buffer_clear(&b);
909 buffer_append(&b, session_id2, session_id2_len);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000910 skip = session_id2_len;
Damien Miller30c3d422000-05-09 11:02:59 +1000911 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100912 buffer_put_cstring(&b, authctxt->server_user);
913 buffer_put_cstring(&b, authctxt->service);
Damien Miller874d77b2000-10-14 16:23:11 +1100914 buffer_put_cstring(&b, authctxt->method->name);
915 buffer_put_char(&b, have_sig);
Ben Lindstromd121f612000-12-03 17:00:47 +0000916 if (!(datafellows & SSH_BUG_PKAUTH))
Damien Miller280ecfb2003-05-14 13:46:00 +1000917 buffer_put_cstring(&b, key_ssh_name(id->key));
Damien Miller30c3d422000-05-09 11:02:59 +1000918 buffer_put_string(&b, blob, bloblen);
919 }
920 xfree(blob);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000921
Damien Millereba71ba2000-04-29 23:57:08 +1000922 /* append signature */
923 buffer_put_string(&b, signature, slen);
924 xfree(signature);
925
926 /* skip session id and packet type */
Damien Miller6536c7d2000-06-22 21:32:31 +1000927 if (buffer_len(&b) < skip + 1)
Damien Miller62cee002000-09-23 17:15:56 +1100928 fatal("userauth_pubkey: internal error");
Damien Miller6536c7d2000-06-22 21:32:31 +1000929 buffer_consume(&b, skip + 1);
Damien Millereba71ba2000-04-29 23:57:08 +1000930
931 /* put remaining data from buffer into packet */
932 packet_start(SSH2_MSG_USERAUTH_REQUEST);
933 packet_put_raw(buffer_ptr(&b), buffer_len(&b));
934 buffer_free(&b);
Damien Millereba71ba2000-04-29 23:57:08 +1000935 packet_send();
Damien Millerad833b32000-08-23 10:46:23 +1000936
937 return 1;
Damien Miller994cf142000-07-21 10:19:44 +1000938}
939
Ben Lindstrombba81212001-06-25 05:01:22 +0000940static int
Damien Miller280ecfb2003-05-14 13:46:00 +1000941send_pubkey_test(Authctxt *authctxt, Identity *id)
Damien Miller994cf142000-07-21 10:19:44 +1000942{
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000943 u_char *blob;
Ben Lindstromc58ab022002-02-26 18:15:09 +0000944 u_int bloblen, have_sig = 0;
Damien Miller994cf142000-07-21 10:19:44 +1000945
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000946 debug3("send_pubkey_test");
947
Damien Miller280ecfb2003-05-14 13:46:00 +1000948 if (key_to_blob(id->key, &blob, &bloblen) == 0) {
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000949 /* we cannot handle this key */
950 debug3("send_pubkey_test: cannot handle key");
Damien Miller994cf142000-07-21 10:19:44 +1000951 return 0;
952 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000953 /* register callback for USERAUTH_PK_OK message */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000954 dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
Damien Miller994cf142000-07-21 10:19:44 +1000955
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000956 packet_start(SSH2_MSG_USERAUTH_REQUEST);
957 packet_put_cstring(authctxt->server_user);
958 packet_put_cstring(authctxt->service);
959 packet_put_cstring(authctxt->method->name);
960 packet_put_char(have_sig);
961 if (!(datafellows & SSH_BUG_PKAUTH))
Damien Miller280ecfb2003-05-14 13:46:00 +1000962 packet_put_cstring(key_ssh_name(id->key));
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000963 packet_put_string(blob, bloblen);
964 xfree(blob);
965 packet_send();
966 return 1;
967}
968
Ben Lindstrombba81212001-06-25 05:01:22 +0000969static Key *
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000970load_identity_file(char *filename)
971{
972 Key *private;
973 char prompt[300], *passphrase;
Darren Tucker232b76f2006-05-06 17:41:51 +1000974 int perm_ok, quit, i;
Ben Lindstrom329782e2001-03-10 17:08:59 +0000975 struct stat st;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000976
Ben Lindstrom329782e2001-03-10 17:08:59 +0000977 if (stat(filename, &st) < 0) {
978 debug3("no such identity: %s", filename);
979 return NULL;
980 }
Darren Tucker232b76f2006-05-06 17:41:51 +1000981 private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok);
982 if (!perm_ok)
983 return NULL;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000984 if (private == NULL) {
985 if (options.batch_mode)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000986 return NULL;
Damien Miller994cf142000-07-21 10:19:44 +1000987 snprintf(prompt, sizeof prompt,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100988 "Enter passphrase for key '%.100s': ", filename);
Damien Miller62cee002000-09-23 17:15:56 +1100989 for (i = 0; i < options.number_of_password_prompts; i++) {
990 passphrase = read_passphrase(prompt, 0);
991 if (strcmp(passphrase, "") != 0) {
Darren Tucker232b76f2006-05-06 17:41:51 +1000992 private = key_load_private_type(KEY_UNSPEC,
993 filename, passphrase, NULL, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000994 quit = 0;
Damien Miller62cee002000-09-23 17:15:56 +1100995 } else {
996 debug2("no passphrase given, try next key");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000997 quit = 1;
Damien Miller62cee002000-09-23 17:15:56 +1100998 }
999 memset(passphrase, 0, strlen(passphrase));
1000 xfree(passphrase);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001001 if (private != NULL || quit)
Damien Miller62cee002000-09-23 17:15:56 +11001002 break;
1003 debug2("bad passphrase given, try again...");
1004 }
Damien Miller994cf142000-07-21 10:19:44 +10001005 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001006 return private;
1007}
1008
Damien Miller280ecfb2003-05-14 13:46:00 +10001009/*
1010 * try keys in the following order:
1011 * 1. agent keys that are found in the config file
1012 * 2. other agent keys
1013 * 3. keys that are only listed in the config file
1014 */
1015static void
1016pubkey_prepare(Authctxt *authctxt)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001017{
Damien Miller280ecfb2003-05-14 13:46:00 +10001018 Identity *id;
1019 Idlist agent, files, *preferred;
1020 Key *key;
1021 AuthenticationConnection *ac;
Damien Millerad833b32000-08-23 10:46:23 +10001022 char *comment;
Damien Miller280ecfb2003-05-14 13:46:00 +10001023 int i, found;
Damien Millerad833b32000-08-23 10:46:23 +10001024
Damien Miller280ecfb2003-05-14 13:46:00 +10001025 TAILQ_INIT(&agent); /* keys from the agent */
1026 TAILQ_INIT(&files); /* keys from the config file */
1027 preferred = &authctxt->keys;
1028 TAILQ_INIT(preferred); /* preferred order of keys */
1029
1030 /* list of keys stored in the filesystem */
1031 for (i = 0; i < options.num_identity_files; i++) {
1032 key = options.identity_keys[i];
1033 if (key && key->type == KEY_RSA1)
1034 continue;
1035 options.identity_keys[i] = NULL;
Damien Miller07d86be2006-03-26 14:19:21 +11001036 id = xcalloc(1, sizeof(*id));
Damien Miller280ecfb2003-05-14 13:46:00 +10001037 id->key = key;
1038 id->filename = xstrdup(options.identity_files[i]);
1039 TAILQ_INSERT_TAIL(&files, id, next);
Damien Millerad833b32000-08-23 10:46:23 +10001040 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001041 /* list of keys supported by the agent */
1042 if ((ac = ssh_get_authentication_connection())) {
1043 for (key = ssh_get_first_identity(ac, &comment, 2);
1044 key != NULL;
1045 key = ssh_get_next_identity(ac, &comment, 2)) {
1046 found = 0;
1047 TAILQ_FOREACH(id, &files, next) {
Damien Millera8e06ce2003-11-21 23:48:55 +11001048 /* agent keys from the config file are preferred */
Damien Miller280ecfb2003-05-14 13:46:00 +10001049 if (key_equal(key, id->key)) {
1050 key_free(key);
1051 xfree(comment);
1052 TAILQ_REMOVE(&files, id, next);
1053 TAILQ_INSERT_TAIL(preferred, id, next);
1054 id->ac = ac;
1055 found = 1;
1056 break;
1057 }
1058 }
Damien Millerbd394c32004-03-08 23:12:36 +11001059 if (!found && !options.identities_only) {
Damien Miller07d86be2006-03-26 14:19:21 +11001060 id = xcalloc(1, sizeof(*id));
Damien Miller280ecfb2003-05-14 13:46:00 +10001061 id->key = key;
1062 id->filename = comment;
1063 id->ac = ac;
1064 TAILQ_INSERT_TAIL(&agent, id, next);
1065 }
1066 }
1067 /* append remaining agent keys */
1068 for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1069 TAILQ_REMOVE(&agent, id, next);
1070 TAILQ_INSERT_TAIL(preferred, id, next);
1071 }
1072 authctxt->agent = ac;
Damien Miller62cee002000-09-23 17:15:56 +11001073 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001074 /* append remaining keys from the config file */
1075 for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1076 TAILQ_REMOVE(&files, id, next);
1077 TAILQ_INSERT_TAIL(preferred, id, next);
1078 }
1079 TAILQ_FOREACH(id, preferred, next) {
1080 debug2("key: %s (%p)", id->filename, id->key);
1081 }
1082}
1083
1084static void
1085pubkey_cleanup(Authctxt *authctxt)
1086{
1087 Identity *id;
1088
1089 if (authctxt->agent != NULL)
1090 ssh_close_authentication_connection(authctxt->agent);
1091 for (id = TAILQ_FIRST(&authctxt->keys); id;
1092 id = TAILQ_FIRST(&authctxt->keys)) {
1093 TAILQ_REMOVE(&authctxt->keys, id, next);
1094 if (id->key)
1095 key_free(id->key);
1096 if (id->filename)
1097 xfree(id->filename);
1098 xfree(id);
1099 }
Damien Millereba71ba2000-04-29 23:57:08 +10001100}
1101
Damien Miller62cee002000-09-23 17:15:56 +11001102int
1103userauth_pubkey(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +10001104{
Damien Miller280ecfb2003-05-14 13:46:00 +10001105 Identity *id;
Damien Miller62cee002000-09-23 17:15:56 +11001106 int sent = 0;
Damien Millereba71ba2000-04-29 23:57:08 +10001107
Damien Miller280ecfb2003-05-14 13:46:00 +10001108 while ((id = TAILQ_FIRST(&authctxt->keys))) {
1109 if (id->tried++)
1110 return (0);
Darren Tuckerd05b6012003-10-15 15:55:59 +10001111 /* move key to the end of the queue */
Damien Miller280ecfb2003-05-14 13:46:00 +10001112 TAILQ_REMOVE(&authctxt->keys, id, next);
1113 TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1114 /*
1115 * send a test message if we have the public key. for
1116 * encrypted keys we cannot do this and have to load the
1117 * private key instead
1118 */
1119 if (id->key && id->key->type != KEY_RSA1) {
1120 debug("Offering public key: %s", id->filename);
1121 sent = send_pubkey_test(authctxt, id);
1122 } else if (id->key == NULL) {
1123 debug("Trying private key: %s", id->filename);
1124 id->key = load_identity_file(id->filename);
1125 if (id->key != NULL) {
1126 id->isprivate = 1;
1127 sent = sign_and_send_pubkey(authctxt, id);
1128 key_free(id->key);
1129 id->key = NULL;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001130 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001131 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001132 if (sent)
1133 return (sent);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001134 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001135 return (0);
Damien Miller62cee002000-09-23 17:15:56 +11001136}
Damien Millereba71ba2000-04-29 23:57:08 +10001137
Damien Miller874d77b2000-10-14 16:23:11 +11001138/*
1139 * Send userauth request message specifying keyboard-interactive method.
1140 */
1141int
1142userauth_kbdint(Authctxt *authctxt)
1143{
1144 static int attempt = 0;
1145
1146 if (attempt++ >= options.number_of_password_prompts)
1147 return 0;
Ben Lindstrom7d199962001-09-12 18:29:00 +00001148 /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1149 if (attempt > 1 && !authctxt->info_req_seen) {
1150 debug3("userauth_kbdint: disable: no info_req_seen");
1151 dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1152 return 0;
1153 }
Damien Miller874d77b2000-10-14 16:23:11 +11001154
1155 debug2("userauth_kbdint");
1156 packet_start(SSH2_MSG_USERAUTH_REQUEST);
1157 packet_put_cstring(authctxt->server_user);
1158 packet_put_cstring(authctxt->service);
1159 packet_put_cstring(authctxt->method->name);
1160 packet_put_cstring(""); /* lang */
1161 packet_put_cstring(options.kbd_interactive_devices ?
1162 options.kbd_interactive_devices : "");
1163 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +11001164
1165 dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1166 return 1;
1167}
1168
1169/*
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001170 * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
Damien Miller874d77b2000-10-14 16:23:11 +11001171 */
1172void
Damien Miller630d6f42002-01-22 23:17:30 +11001173input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
Damien Miller874d77b2000-10-14 16:23:11 +11001174{
1175 Authctxt *authctxt = ctxt;
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001176 char *name, *inst, *lang, *prompt, *response;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001177 u_int num_prompts, i;
Damien Miller874d77b2000-10-14 16:23:11 +11001178 int echo = 0;
1179
1180 debug2("input_userauth_info_req");
1181
1182 if (authctxt == NULL)
1183 fatal("input_userauth_info_req: no authentication context");
1184
Ben Lindstrom7d199962001-09-12 18:29:00 +00001185 authctxt->info_req_seen = 1;
1186
Damien Miller874d77b2000-10-14 16:23:11 +11001187 name = packet_get_string(NULL);
1188 inst = packet_get_string(NULL);
1189 lang = packet_get_string(NULL);
Damien Miller874d77b2000-10-14 16:23:11 +11001190 if (strlen(name) > 0)
Damien Miller996acd22003-04-09 20:59:48 +10001191 logit("%s", name);
Damien Miller874d77b2000-10-14 16:23:11 +11001192 if (strlen(inst) > 0)
Damien Miller996acd22003-04-09 20:59:48 +10001193 logit("%s", inst);
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001194 xfree(name);
Damien Miller874d77b2000-10-14 16:23:11 +11001195 xfree(inst);
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001196 xfree(lang);
Damien Miller874d77b2000-10-14 16:23:11 +11001197
1198 num_prompts = packet_get_int();
1199 /*
1200 * Begin to build info response packet based on prompts requested.
1201 * We commit to providing the correct number of responses, so if
1202 * further on we run into a problem that prevents this, we have to
1203 * be sure and clean this up and send a correct error response.
1204 */
1205 packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
1206 packet_put_int(num_prompts);
1207
Ben Lindstrom551ea372001-06-05 18:56:16 +00001208 debug2("input_userauth_info_req: num_prompts %d", num_prompts);
Damien Miller874d77b2000-10-14 16:23:11 +11001209 for (i = 0; i < num_prompts; i++) {
1210 prompt = packet_get_string(NULL);
1211 echo = packet_get_char();
1212
Ben Lindstrom949974b2001-06-25 05:20:31 +00001213 response = read_passphrase(prompt, echo ? RP_ECHO : 0);
Damien Miller874d77b2000-10-14 16:23:11 +11001214
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001215 packet_put_cstring(response);
Damien Miller874d77b2000-10-14 16:23:11 +11001216 memset(response, 0, strlen(response));
1217 xfree(response);
1218 xfree(prompt);
1219 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001220 packet_check_eom(); /* done with parsing incoming message. */
Damien Miller874d77b2000-10-14 16:23:11 +11001221
Damien Miller9f643902001-11-12 11:02:52 +11001222 packet_add_padding(64);
Damien Miller874d77b2000-10-14 16:23:11 +11001223 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +11001224}
Damien Miller62cee002000-09-23 17:15:56 +11001225
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001226static int
Ben Lindstrom5c385522002-06-23 21:23:20 +00001227ssh_keysign(Key *key, u_char **sigp, u_int *lenp,
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001228 u_char *data, u_int datalen)
1229{
1230 Buffer b;
Ben Lindstrom5206b952002-06-06 19:59:29 +00001231 struct stat st;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001232 pid_t pid;
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001233 int to[2], from[2], status, version = 2;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001234
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001235 debug2("ssh_keysign called");
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001236
Ben Lindstrom5206b952002-06-06 19:59:29 +00001237 if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1238 error("ssh_keysign: no installed: %s", strerror(errno));
1239 return -1;
1240 }
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001241 if (fflush(stdout) != 0)
1242 error("ssh_keysign: fflush: %s", strerror(errno));
1243 if (pipe(to) < 0) {
1244 error("ssh_keysign: pipe: %s", strerror(errno));
1245 return -1;
1246 }
1247 if (pipe(from) < 0) {
1248 error("ssh_keysign: pipe: %s", strerror(errno));
1249 return -1;
1250 }
1251 if ((pid = fork()) < 0) {
1252 error("ssh_keysign: fork: %s", strerror(errno));
1253 return -1;
1254 }
1255 if (pid == 0) {
Damien Miller2e5fe882006-06-13 13:10:00 +10001256 permanently_drop_suid(getuid());
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001257 close(from[0]);
1258 if (dup2(from[1], STDOUT_FILENO) < 0)
1259 fatal("ssh_keysign: dup2: %s", strerror(errno));
1260 close(to[1]);
1261 if (dup2(to[0], STDIN_FILENO) < 0)
1262 fatal("ssh_keysign: dup2: %s", strerror(errno));
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001263 close(from[1]);
1264 close(to[0]);
Ben Lindstrom4887da22002-06-06 20:05:57 +00001265 execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001266 fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN,
1267 strerror(errno));
1268 }
1269 close(from[1]);
1270 close(to[0]);
1271
1272 buffer_init(&b);
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001273 buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001274 buffer_put_string(&b, data, datalen);
Damien Miller51bf11f2003-11-17 21:20:47 +11001275 if (ssh_msg_send(to[1], version, &b) == -1)
1276 fatal("ssh_keysign: couldn't send request");
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001277
Damien Miller901119b2002-10-04 11:10:04 +10001278 if (ssh_msg_recv(from[0], &b) < 0) {
Ben Lindstrom5206b952002-06-06 19:59:29 +00001279 error("ssh_keysign: no reply");
Damien Millerfb1310e2004-01-21 11:02:50 +11001280 buffer_free(&b);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001281 return -1;
1282 }
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001283 close(from[0]);
1284 close(to[1]);
1285
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001286 while (waitpid(pid, &status, 0) < 0)
1287 if (errno != EINTR)
1288 break;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001289
Ben Lindstrom5206b952002-06-06 19:59:29 +00001290 if (buffer_get_char(&b) != version) {
1291 error("ssh_keysign: bad version");
Damien Millerfb1310e2004-01-21 11:02:50 +11001292 buffer_free(&b);
Ben Lindstrom5206b952002-06-06 19:59:29 +00001293 return -1;
1294 }
1295 *sigp = buffer_get_string(&b, lenp);
Damien Millerfb1310e2004-01-21 11:02:50 +11001296 buffer_free(&b);
Ben Lindstrom5206b952002-06-06 19:59:29 +00001297
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001298 return 0;
1299}
1300
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001301int
1302userauth_hostbased(Authctxt *authctxt)
1303{
1304 Key *private = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001305 Sensitive *sensitive = authctxt->sensitive;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001306 Buffer b;
1307 u_char *signature, *blob;
1308 char *chost, *pkalg, *p;
Ben Lindstrom671388f2001-04-19 20:40:45 +00001309 const char *service;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001310 u_int blen, slen;
Ben Lindstrom2bffd6f2001-04-19 20:35:40 +00001311 int ok, i, len, found = 0;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001312
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001313 /* check for a useful key */
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001314 for (i = 0; i < sensitive->nkeys; i++) {
1315 private = sensitive->keys[i];
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001316 if (private && private->type != KEY_RSA1) {
1317 found = 1;
1318 /* we take and free the key */
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001319 sensitive->keys[i] = NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001320 break;
1321 }
1322 }
1323 if (!found) {
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001324 debug("No more client hostkeys for hostbased authentication.");
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001325 return 0;
1326 }
1327 if (key_to_blob(private, &blob, &blen) == 0) {
1328 key_free(private);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001329 return 0;
1330 }
Damien Miller91c18472001-11-12 11:02:03 +11001331 /* figure out a name for the client host */
1332 p = get_local_name(packet_get_connection_in());
1333 if (p == NULL) {
1334 error("userauth_hostbased: cannot get local ipaddr/name");
1335 key_free(private);
Damien Miller5790b592006-03-26 13:54:03 +11001336 xfree(blob);
Damien Miller91c18472001-11-12 11:02:03 +11001337 return 0;
1338 }
1339 len = strlen(p) + 2;
Damien Miller07d86be2006-03-26 14:19:21 +11001340 xasprintf(&chost, "%s.", p);
Damien Miller91c18472001-11-12 11:02:03 +11001341 debug2("userauth_hostbased: chost %s", chost);
Damien Miller00111382003-03-10 11:21:17 +11001342 xfree(p);
Damien Miller91c18472001-11-12 11:02:03 +11001343
Ben Lindstrom671388f2001-04-19 20:40:45 +00001344 service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
1345 authctxt->service;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001346 pkalg = xstrdup(key_ssh_name(private));
1347 buffer_init(&b);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001348 /* construct data */
Ben Lindstrom671388f2001-04-19 20:40:45 +00001349 buffer_put_string(&b, session_id2, session_id2_len);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001350 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1351 buffer_put_cstring(&b, authctxt->server_user);
Ben Lindstrom671388f2001-04-19 20:40:45 +00001352 buffer_put_cstring(&b, service);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001353 buffer_put_cstring(&b, authctxt->method->name);
1354 buffer_put_cstring(&b, pkalg);
1355 buffer_put_string(&b, blob, blen);
1356 buffer_put_cstring(&b, chost);
1357 buffer_put_cstring(&b, authctxt->local_user);
1358#ifdef DEBUG_PK
1359 buffer_dump(&b);
1360#endif
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001361 if (sensitive->external_keysign)
1362 ok = ssh_keysign(private, &signature, &slen,
1363 buffer_ptr(&b), buffer_len(&b));
1364 else
1365 ok = key_sign(private, &signature, &slen,
1366 buffer_ptr(&b), buffer_len(&b));
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001367 key_free(private);
1368 buffer_free(&b);
1369 if (ok != 0) {
1370 error("key_sign failed");
1371 xfree(chost);
1372 xfree(pkalg);
Damien Miller5790b592006-03-26 13:54:03 +11001373 xfree(blob);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001374 return 0;
1375 }
1376 packet_start(SSH2_MSG_USERAUTH_REQUEST);
1377 packet_put_cstring(authctxt->server_user);
1378 packet_put_cstring(authctxt->service);
1379 packet_put_cstring(authctxt->method->name);
1380 packet_put_cstring(pkalg);
1381 packet_put_string(blob, blen);
1382 packet_put_cstring(chost);
1383 packet_put_cstring(authctxt->local_user);
1384 packet_put_string(signature, slen);
1385 memset(signature, 's', slen);
1386 xfree(signature);
1387 xfree(chost);
1388 xfree(pkalg);
Damien Miller5790b592006-03-26 13:54:03 +11001389 xfree(blob);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001390
1391 packet_send();
1392 return 1;
1393}
1394
Damien Miller62cee002000-09-23 17:15:56 +11001395/* find auth method */
1396
Damien Miller62cee002000-09-23 17:15:56 +11001397/*
1398 * given auth method name, if configurable options permit this method fill
1399 * in auth_ident field and return true, otherwise return false.
1400 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001401static int
Damien Miller62cee002000-09-23 17:15:56 +11001402authmethod_is_enabled(Authmethod *method)
1403{
1404 if (method == NULL)
1405 return 0;
1406 /* return false if options indicate this method is disabled */
1407 if (method->enabled == NULL || *method->enabled == 0)
1408 return 0;
1409 /* return false if batch mode is enabled but method needs interactive mode */
1410 if (method->batch_flag != NULL && *method->batch_flag != 0)
1411 return 0;
1412 return 1;
1413}
1414
Ben Lindstrombba81212001-06-25 05:01:22 +00001415static Authmethod *
Damien Miller62cee002000-09-23 17:15:56 +11001416authmethod_lookup(const char *name)
1417{
1418 Authmethod *method = NULL;
1419 if (name != NULL)
1420 for (method = authmethods; method->name != NULL; method++)
1421 if (strcmp(name, method->name) == 0)
1422 return method;
1423 debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
1424 return NULL;
1425}
1426
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001427/* XXX internal state */
1428static Authmethod *current = NULL;
1429static char *supported = NULL;
1430static char *preferred = NULL;
Ben Lindstrom5c385522002-06-23 21:23:20 +00001431
Damien Miller62cee002000-09-23 17:15:56 +11001432/*
1433 * Given the authentication method list sent by the server, return the
1434 * next method we should try. If the server initially sends a nil list,
Ben Lindstroma3700052001-04-05 23:26:32 +00001435 * use a built-in default list.
Kevin Stevesef4eea92001-02-05 12:42:17 +00001436 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001437static Authmethod *
Damien Miller62cee002000-09-23 17:15:56 +11001438authmethod_get(char *authlist)
1439{
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001440 char *name = NULL;
Ben Lindstromc58ab022002-02-26 18:15:09 +00001441 u_int next;
Kevin Stevesef4eea92001-02-05 12:42:17 +00001442
Damien Miller62cee002000-09-23 17:15:56 +11001443 /* Use a suitable default if we're passed a nil list. */
1444 if (authlist == NULL || strlen(authlist) == 0)
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001445 authlist = options.preferred_authentications;
Damien Miller62cee002000-09-23 17:15:56 +11001446
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001447 if (supported == NULL || strcmp(authlist, supported) != 0) {
1448 debug3("start over, passed a different list %s", authlist);
1449 if (supported != NULL)
1450 xfree(supported);
1451 supported = xstrdup(authlist);
1452 preferred = options.preferred_authentications;
1453 debug3("preferred %s", preferred);
1454 current = NULL;
1455 } else if (current != NULL && authmethod_is_enabled(current))
1456 return current;
Damien Millereba71ba2000-04-29 23:57:08 +10001457
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001458 for (;;) {
1459 if ((name = match_list(preferred, supported, &next)) == NULL) {
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001460 debug("No more authentication methods to try.");
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001461 current = NULL;
1462 return NULL;
Damien Miller874d77b2000-10-14 16:23:11 +11001463 }
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001464 preferred += next;
1465 debug3("authmethod_lookup %s", name);
1466 debug3("remaining preferred: %s", preferred);
1467 if ((current = authmethod_lookup(name)) != NULL &&
1468 authmethod_is_enabled(current)) {
1469 debug3("authmethod_is_enabled %s", name);
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001470 debug("Next authentication method: %s", name);
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001471 return current;
1472 }
Damien Millereba71ba2000-04-29 23:57:08 +10001473 }
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001474}
Damien Miller62cee002000-09-23 17:15:56 +11001475
Ben Lindstrom79073822001-07-04 03:42:30 +00001476static char *
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001477authmethods_get(void)
1478{
1479 Authmethod *method = NULL;
Damien Miller0e3b8722002-01-22 23:26:38 +11001480 Buffer b;
1481 char *list;
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001482
Damien Miller0e3b8722002-01-22 23:26:38 +11001483 buffer_init(&b);
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001484 for (method = authmethods; method->name != NULL; method++) {
1485 if (authmethod_is_enabled(method)) {
Damien Miller0e3b8722002-01-22 23:26:38 +11001486 if (buffer_len(&b) > 0)
1487 buffer_append(&b, ",", 1);
1488 buffer_append(&b, method->name, strlen(method->name));
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001489 }
Damien Miller62cee002000-09-23 17:15:56 +11001490 }
Damien Miller0e3b8722002-01-22 23:26:38 +11001491 buffer_append(&b, "\0", 1);
1492 list = xstrdup(buffer_ptr(&b));
1493 buffer_free(&b);
1494 return list;
Damien Millereba71ba2000-04-29 23:57:08 +10001495}