blob: ce64586d8caf0159dc1bba997274852592c417eb [file] [log] [blame]
Damien Millereba71ba2000-04-29 23:57:08 +10001/*
2 * Copyright (c) 2000 Markus Friedl. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
Damien Millereba71ba2000-04-29 23:57:08 +100012 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include "includes.h"
Damien Miller2eb63402006-03-15 11:09:42 +110026RCSID("$OpenBSD: sshconnect2.c,v 1.144 2006/02/07 01:18:09 stevesk Exp $");
27
28#include <sys/queue.h>
Damien Millereba71ba2000-04-29 23:57:08 +100029
Damien Miller9c617692003-05-14 14:31:11 +100030#include "openbsd-compat/sys-queue.h"
31
Damien Millereba71ba2000-04-29 23:57:08 +100032#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000033#include "ssh2.h"
Damien Millereba71ba2000-04-29 23:57:08 +100034#include "xmalloc.h"
Damien Millereba71ba2000-04-29 23:57:08 +100035#include "buffer.h"
36#include "packet.h"
Damien Millereba71ba2000-04-29 23:57:08 +100037#include "compat.h"
Damien Millereba71ba2000-04-29 23:57:08 +100038#include "bufaux.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000039#include "cipher.h"
Damien Millereba71ba2000-04-29 23:57:08 +100040#include "kex.h"
41#include "myproposal.h"
Damien Millereba71ba2000-04-29 23:57:08 +100042#include "sshconnect.h"
43#include "authfile.h"
Ben Lindstromdf221392001-03-29 00:36:16 +000044#include "dh.h"
Damien Millerad833b32000-08-23 10:46:23 +100045#include "authfd.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000046#include "log.h"
47#include "readconf.h"
Darren Tuckere608ca22004-05-13 16:15:47 +100048#include "misc.h"
Ben Lindstromb9be60a2001-03-11 01:49:19 +000049#include "match.h"
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000050#include "dispatch.h"
Ben Lindstrom5eabda32001-04-12 23:34:34 +000051#include "canohost.h"
Ben Lindstrom1bad2562002-06-06 19:57:33 +000052#include "msg.h"
53#include "pathnames.h"
Damien Miller874d77b2000-10-14 16:23:11 +110054
Darren Tucker0efd1552003-08-26 11:49:55 +100055#ifdef GSSAPI
56#include "ssh-gss.h"
57#endif
58
Damien Millereba71ba2000-04-29 23:57:08 +100059/* import */
60extern char *client_version_string;
61extern char *server_version_string;
62extern Options options;
63
64/*
65 * SSH2 key exchange
66 */
67
Ben Lindstrom46c16222000-12-22 01:43:59 +000068u_char *session_id2 = NULL;
Darren Tucker502d3842003-06-28 12:38:01 +100069u_int session_id2_len = 0;
Damien Millereba71ba2000-04-29 23:57:08 +100070
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000071char *xxx_host;
72struct sockaddr *xxx_hostaddr;
73
Ben Lindstromf28f6342001-04-04 02:03:04 +000074Kex *xxx_kex = NULL;
75
Ben Lindstrombba81212001-06-25 05:01:22 +000076static int
Ben Lindstromd6481ea2001-06-25 04:37:41 +000077verify_host_key_callback(Key *hostkey)
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000078{
Ben Lindstromd6481ea2001-06-25 04:37:41 +000079 if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
Damien Miller59d9fb92001-10-10 15:03:11 +100080 fatal("Host key verification failed.");
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000081 return 0;
82}
83
Damien Millereba71ba2000-04-29 23:57:08 +100084void
Damien Miller874d77b2000-10-14 16:23:11 +110085ssh_kex2(char *host, struct sockaddr *hostaddr)
86{
Damien Miller874d77b2000-10-14 16:23:11 +110087 Kex *kex;
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000088
89 xxx_host = host;
90 xxx_hostaddr = hostaddr;
Damien Miller874d77b2000-10-14 16:23:11 +110091
Damien Millere39cacc2000-11-29 12:18:44 +110092 if (options.ciphers == (char *)-1) {
Damien Miller996acd22003-04-09 20:59:48 +100093 logit("No valid ciphers for protocol version 2 given, using defaults.");
Damien Millere39cacc2000-11-29 12:18:44 +110094 options.ciphers = NULL;
Damien Miller874d77b2000-10-14 16:23:11 +110095 }
96 if (options.ciphers != NULL) {
97 myproposal[PROPOSAL_ENC_ALGS_CTOS] =
98 myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
99 }
Damien Millera0ff4662001-03-30 10:49:35 +1000100 myproposal[PROPOSAL_ENC_ALGS_CTOS] =
101 compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
102 myproposal[PROPOSAL_ENC_ALGS_STOC] =
103 compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]);
Damien Miller874d77b2000-10-14 16:23:11 +1100104 if (options.compression) {
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000105 myproposal[PROPOSAL_COMP_ALGS_CTOS] =
Damien Miller9786e6e2005-07-26 21:54:56 +1000106 myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none";
Damien Miller874d77b2000-10-14 16:23:11 +1100107 } else {
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] = "none,zlib@openssh.com,zlib";
Damien Miller874d77b2000-10-14 16:23:11 +1100110 }
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000111 if (options.macs != NULL) {
112 myproposal[PROPOSAL_MAC_ALGS_CTOS] =
113 myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
114 }
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000115 if (options.hostkeyalgorithms != NULL)
Damien Miller9f0f5c62001-12-21 14:45:46 +1100116 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000117 options.hostkeyalgorithms;
Damien Miller874d77b2000-10-14 16:23:11 +1100118
Damien Millera5539d22003-04-09 20:50:06 +1000119 if (options.rekey_limit)
120 packet_set_rekey_limit(options.rekey_limit);
121
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000122 /* start key exchange */
Ben Lindstrom238abf62001-04-04 17:52:53 +0000123 kex = kex_setup(myproposal);
Damien Miller8e7fb332003-02-24 12:03:03 +1100124 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
Damien Millerf675fc42004-06-15 10:30:09 +1000125 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
Damien Miller8e7fb332003-02-24 12:03:03 +1100126 kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000127 kex->client_version_string=client_version_string;
128 kex->server_version_string=server_version_string;
Ben Lindstromd6481ea2001-06-25 04:37:41 +0000129 kex->verify_host_key=&verify_host_key_callback;
Damien Miller874d77b2000-10-14 16:23:11 +1100130
Ben Lindstromf28f6342001-04-04 02:03:04 +0000131 xxx_kex = kex;
132
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000133 dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
Damien Miller874d77b2000-10-14 16:23:11 +1100134
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000135 session_id2 = kex->session_id;
136 session_id2_len = kex->session_id_len;
137
Damien Miller874d77b2000-10-14 16:23:11 +1100138#ifdef DEBUG_KEXDH
139 /* send 1st encrypted/maced/compressed message */
140 packet_start(SSH2_MSG_IGNORE);
141 packet_put_cstring("markus");
142 packet_send();
143 packet_write_wait();
144#endif
Damien Millereba71ba2000-04-29 23:57:08 +1000145}
Damien Millerb1715dc2000-05-30 13:44:51 +1000146
Damien Millereba71ba2000-04-29 23:57:08 +1000147/*
148 * Authenticate user
149 */
Damien Miller62cee002000-09-23 17:15:56 +1100150
151typedef struct Authctxt Authctxt;
152typedef struct Authmethod Authmethod;
Damien Miller280ecfb2003-05-14 13:46:00 +1000153typedef struct identity Identity;
154typedef struct idlist Idlist;
Damien Miller62cee002000-09-23 17:15:56 +1100155
Damien Miller280ecfb2003-05-14 13:46:00 +1000156struct identity {
157 TAILQ_ENTRY(identity) next;
158 AuthenticationConnection *ac; /* set if agent supports key */
159 Key *key; /* public/private key */
160 char *filename; /* comment for agent-only keys */
161 int tried;
162 int isprivate; /* key points to the private key */
163};
164TAILQ_HEAD(idlist, identity);
Damien Miller62cee002000-09-23 17:15:56 +1100165
166struct Authctxt {
167 const char *server_user;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000168 const char *local_user;
Damien Miller62cee002000-09-23 17:15:56 +1100169 const char *host;
170 const char *service;
Damien Miller62cee002000-09-23 17:15:56 +1100171 Authmethod *method;
Damien Miller874d77b2000-10-14 16:23:11 +1100172 int success;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000173 char *authlist;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000174 /* pubkey */
Damien Miller280ecfb2003-05-14 13:46:00 +1000175 Idlist keys;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000176 AuthenticationConnection *agent;
177 /* hostbased */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000178 Sensitive *sensitive;
Ben Lindstrom7d199962001-09-12 18:29:00 +0000179 /* kbd-interactive */
180 int info_req_seen;
Darren Tucker0efd1552003-08-26 11:49:55 +1000181 /* generic */
182 void *methoddata;
Damien Miller62cee002000-09-23 17:15:56 +1100183};
184struct Authmethod {
185 char *name; /* string to compare against server's list */
186 int (*userauth)(Authctxt *authctxt);
187 int *enabled; /* flag in option struct that enables method */
188 int *batch_flag; /* flag in option struct that disables method */
189};
190
Damien Miller630d6f42002-01-22 23:17:30 +1100191void input_userauth_success(int, u_int32_t, void *);
192void input_userauth_failure(int, u_int32_t, void *);
193void input_userauth_banner(int, u_int32_t, void *);
194void input_userauth_error(int, u_int32_t, void *);
195void input_userauth_info_req(int, u_int32_t, void *);
196void input_userauth_pk_ok(int, u_int32_t, void *);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000197void input_userauth_passwd_changereq(int, u_int32_t, void *);
Damien Miller874d77b2000-10-14 16:23:11 +1100198
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000199int userauth_none(Authctxt *);
200int userauth_pubkey(Authctxt *);
201int userauth_passwd(Authctxt *);
202int userauth_kbdint(Authctxt *);
203int userauth_hostbased(Authctxt *);
Damien Miller3ab496b2003-05-14 13:47:37 +1000204int userauth_kerberos(Authctxt *);
Damien Miller62cee002000-09-23 17:15:56 +1100205
Darren Tucker0efd1552003-08-26 11:49:55 +1000206#ifdef GSSAPI
207int userauth_gssapi(Authctxt *authctxt);
208void input_gssapi_response(int type, u_int32_t, void *);
209void input_gssapi_token(int type, u_int32_t, void *);
210void input_gssapi_hash(int type, u_int32_t, void *);
211void input_gssapi_error(int, u_int32_t, void *);
212void input_gssapi_errtok(int, u_int32_t, void *);
213#endif
214
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000215void userauth(Authctxt *, char *);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000216
Damien Miller280ecfb2003-05-14 13:46:00 +1000217static int sign_and_send_pubkey(Authctxt *, Identity *);
Damien Miller280ecfb2003-05-14 13:46:00 +1000218static void pubkey_prepare(Authctxt *);
219static void pubkey_cleanup(Authctxt *);
220static Key *load_identity_file(char *);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000221
Ben Lindstrombba81212001-06-25 05:01:22 +0000222static Authmethod *authmethod_get(char *authlist);
223static Authmethod *authmethod_lookup(const char *name);
224static char *authmethods_get(void);
Damien Miller62cee002000-09-23 17:15:56 +1100225
226Authmethod authmethods[] = {
Darren Tucker0efd1552003-08-26 11:49:55 +1000227#ifdef GSSAPI
Damien Miller0425d402003-11-17 22:18:21 +1100228 {"gssapi-with-mic",
Darren Tucker0efd1552003-08-26 11:49:55 +1000229 userauth_gssapi,
230 &options.gss_authentication,
231 NULL},
232#endif
Ben Lindstrom1bfe2912001-06-05 19:37:25 +0000233 {"hostbased",
234 userauth_hostbased,
235 &options.hostbased_authentication,
236 NULL},
Ben Lindstrom45350e82001-08-06 20:57:11 +0000237 {"publickey",
238 userauth_pubkey,
239 &options.pubkey_authentication,
240 NULL},
Damien Miller874d77b2000-10-14 16:23:11 +1100241 {"keyboard-interactive",
242 userauth_kbdint,
243 &options.kbd_interactive_authentication,
244 &options.batch_mode},
Ben Lindstrom45350e82001-08-06 20:57:11 +0000245 {"password",
246 userauth_passwd,
247 &options.password_authentication,
248 &options.batch_mode},
Damien Miller874d77b2000-10-14 16:23:11 +1100249 {"none",
250 userauth_none,
251 NULL,
252 NULL},
Damien Miller62cee002000-09-23 17:15:56 +1100253 {NULL, NULL, NULL, NULL}
254};
255
256void
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000257ssh_userauth2(const char *local_user, const char *server_user, char *host,
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000258 Sensitive *sensitive)
Damien Miller62cee002000-09-23 17:15:56 +1100259{
260 Authctxt authctxt;
261 int type;
Damien Miller62cee002000-09-23 17:15:56 +1100262
Ben Lindstrom551ea372001-06-05 18:56:16 +0000263 if (options.challenge_response_authentication)
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +0000264 options.kbd_interactive_authentication = 1;
265
Damien Miller62cee002000-09-23 17:15:56 +1100266 packet_start(SSH2_MSG_SERVICE_REQUEST);
267 packet_put_cstring("ssh-userauth");
268 packet_send();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000269 debug("SSH2_MSG_SERVICE_REQUEST sent");
Damien Miller62cee002000-09-23 17:15:56 +1100270 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100271 type = packet_read();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000272 if (type != SSH2_MSG_SERVICE_ACCEPT)
273 fatal("Server denied authentication request: %d", type);
Damien Miller62cee002000-09-23 17:15:56 +1100274 if (packet_remaining() > 0) {
Damien Millerdff50992002-01-22 23:16:32 +1100275 char *reply = packet_get_string(NULL);
Ben Lindstrom064496f2002-12-23 02:04:22 +0000276 debug2("service_accept: %s", reply);
Damien Miller62cee002000-09-23 17:15:56 +1100277 xfree(reply);
Damien Miller62cee002000-09-23 17:15:56 +1100278 } else {
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000279 debug2("buggy server: service_accept w/o service");
Damien Miller62cee002000-09-23 17:15:56 +1100280 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100281 packet_check_eom();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000282 debug("SSH2_MSG_SERVICE_ACCEPT received");
Damien Miller62cee002000-09-23 17:15:56 +1100283
Ben Lindstromb9be60a2001-03-11 01:49:19 +0000284 if (options.preferred_authentications == NULL)
285 options.preferred_authentications = authmethods_get();
286
Damien Miller62cee002000-09-23 17:15:56 +1100287 /* setup authentication context */
Ben Lindstrom7d199962001-09-12 18:29:00 +0000288 memset(&authctxt, 0, sizeof(authctxt));
Damien Miller280ecfb2003-05-14 13:46:00 +1000289 pubkey_prepare(&authctxt);
Damien Miller62cee002000-09-23 17:15:56 +1100290 authctxt.server_user = server_user;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000291 authctxt.local_user = local_user;
Damien Miller62cee002000-09-23 17:15:56 +1100292 authctxt.host = host;
293 authctxt.service = "ssh-connection"; /* service name */
294 authctxt.success = 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100295 authctxt.method = authmethod_lookup("none");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000296 authctxt.authlist = NULL;
Darren Tucker0efd1552003-08-26 11:49:55 +1000297 authctxt.methoddata = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000298 authctxt.sensitive = sensitive;
Ben Lindstrom7d199962001-09-12 18:29:00 +0000299 authctxt.info_req_seen = 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100300 if (authctxt.method == NULL)
301 fatal("ssh_userauth2: internal error: cannot send userauth none request");
Damien Miller62cee002000-09-23 17:15:56 +1100302
303 /* initial userauth request */
Damien Miller874d77b2000-10-14 16:23:11 +1100304 userauth_none(&authctxt);
Damien Miller62cee002000-09-23 17:15:56 +1100305
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000306 dispatch_init(&input_userauth_error);
Damien Miller62cee002000-09-23 17:15:56 +1100307 dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
308 dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000309 dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
Damien Miller62cee002000-09-23 17:15:56 +1100310 dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */
311
Damien Miller280ecfb2003-05-14 13:46:00 +1000312 pubkey_cleanup(&authctxt);
Damien Millerf842fcb2003-05-15 12:01:28 +1000313 dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
314
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000315 debug("Authentication succeeded (%s).", authctxt.method->name);
Damien Miller62cee002000-09-23 17:15:56 +1100316}
Damien Millerf842fcb2003-05-15 12:01:28 +1000317
Damien Miller62cee002000-09-23 17:15:56 +1100318void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000319userauth(Authctxt *authctxt, char *authlist)
320{
Darren Tucker0efd1552003-08-26 11:49:55 +1000321 if (authctxt->methoddata) {
322 xfree(authctxt->methoddata);
323 authctxt->methoddata = NULL;
324 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000325 if (authlist == NULL) {
326 authlist = authctxt->authlist;
327 } else {
328 if (authctxt->authlist)
329 xfree(authctxt->authlist);
330 authctxt->authlist = authlist;
331 }
332 for (;;) {
333 Authmethod *method = authmethod_get(authlist);
334 if (method == NULL)
335 fatal("Permission denied (%s).", authlist);
336 authctxt->method = method;
Damien Millerf842fcb2003-05-15 12:01:28 +1000337
338 /* reset the per method handler */
339 dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN,
340 SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
341
342 /* and try new method */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000343 if (method->userauth(authctxt) != 0) {
344 debug2("we sent a %s packet, wait for reply", method->name);
345 break;
346 } else {
347 debug2("we did not send a packet, disable method");
348 method->enabled = NULL;
349 }
350 }
351}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000352
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000353void
Damien Miller630d6f42002-01-22 23:17:30 +1100354input_userauth_error(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100355{
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000356 fatal("input_userauth_error: bad message during authentication: "
Damien Miller0dc1bef2005-07-17 17:22:45 +1000357 "type %d", type);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000358}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000359
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000360void
Damien Miller630d6f42002-01-22 23:17:30 +1100361input_userauth_banner(int type, u_int32_t seq, void *ctxt)
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000362{
363 char *msg, *lang;
Darren Tucker79644822003-10-08 17:37:58 +1000364
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000365 debug3("input_userauth_banner");
366 msg = packet_get_string(NULL);
367 lang = packet_get_string(NULL);
Darren Tucker046dff22003-10-08 17:32:02 +1000368 if (options.log_level > SYSLOG_LEVEL_QUIET)
369 fprintf(stderr, "%s", msg);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000370 xfree(msg);
371 xfree(lang);
Damien Miller62cee002000-09-23 17:15:56 +1100372}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000373
Damien Miller62cee002000-09-23 17:15:56 +1100374void
Damien Miller630d6f42002-01-22 23:17:30 +1100375input_userauth_success(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100376{
377 Authctxt *authctxt = ctxt;
378 if (authctxt == NULL)
379 fatal("input_userauth_success: no authentication context");
Darren Tucker79644822003-10-08 17:37:58 +1000380 if (authctxt->authlist) {
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000381 xfree(authctxt->authlist);
Darren Tucker79644822003-10-08 17:37:58 +1000382 authctxt->authlist = NULL;
383 }
384 if (authctxt->methoddata) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000385 xfree(authctxt->methoddata);
Darren Tucker79644822003-10-08 17:37:58 +1000386 authctxt->methoddata = NULL;
387 }
Damien Miller62cee002000-09-23 17:15:56 +1100388 authctxt->success = 1; /* break out */
389}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000390
Damien Miller62cee002000-09-23 17:15:56 +1100391void
Damien Miller630d6f42002-01-22 23:17:30 +1100392input_userauth_failure(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100393{
Damien Miller62cee002000-09-23 17:15:56 +1100394 Authctxt *authctxt = ctxt;
395 char *authlist = NULL;
396 int partial;
Damien Miller62cee002000-09-23 17:15:56 +1100397
398 if (authctxt == NULL)
399 fatal("input_userauth_failure: no authentication context");
400
Damien Miller874d77b2000-10-14 16:23:11 +1100401 authlist = packet_get_string(NULL);
Damien Miller62cee002000-09-23 17:15:56 +1100402 partial = packet_get_char();
Damien Miller48b03fc2002-01-22 23:11:40 +1100403 packet_check_eom();
Damien Miller62cee002000-09-23 17:15:56 +1100404
405 if (partial != 0)
Damien Miller996acd22003-04-09 20:59:48 +1000406 logit("Authenticated with partial success.");
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000407 debug("Authentications that can continue: %s", authlist);
Damien Miller62cee002000-09-23 17:15:56 +1100408
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000409 userauth(authctxt, authlist);
410}
411void
Damien Miller630d6f42002-01-22 23:17:30 +1100412input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000413{
414 Authctxt *authctxt = ctxt;
415 Key *key = NULL;
Damien Miller280ecfb2003-05-14 13:46:00 +1000416 Identity *id = NULL;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000417 Buffer b;
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000418 int pktype, sent = 0;
419 u_int alen, blen;
420 char *pkalg, *fp;
421 u_char *pkblob;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000422
423 if (authctxt == NULL)
424 fatal("input_userauth_pk_ok: no authentication context");
425 if (datafellows & SSH_BUG_PKOK) {
426 /* this is similar to SSH_BUG_PKAUTH */
427 debug2("input_userauth_pk_ok: SSH_BUG_PKOK");
428 pkblob = packet_get_string(&blen);
429 buffer_init(&b);
430 buffer_append(&b, pkblob, blen);
431 pkalg = buffer_get_string(&b, &alen);
432 buffer_free(&b);
433 } else {
434 pkalg = packet_get_string(&alen);
435 pkblob = packet_get_string(&blen);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000436 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100437 packet_check_eom();
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000438
Damien Miller280ecfb2003-05-14 13:46:00 +1000439 debug("Server accepts key: pkalg %s blen %u", pkalg, blen);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000440
Damien Miller280ecfb2003-05-14 13:46:00 +1000441 if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) {
442 debug("unknown pkalg %s", pkalg);
443 goto done;
444 }
445 if ((key = key_from_blob(pkblob, blen)) == NULL) {
446 debug("no key from blob. pkalg %s", pkalg);
447 goto done;
448 }
449 if (key->type != pktype) {
450 error("input_userauth_pk_ok: type mismatch "
451 "for decoded key (received %d, expected %d)",
452 key->type, pktype);
453 goto done;
454 }
455 fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
456 debug2("input_userauth_pk_ok: fp %s", fp);
457 xfree(fp);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000458
Darren Tuckerd05b6012003-10-15 15:55:59 +1000459 /*
460 * search keys in the reverse order, because last candidate has been
461 * moved to the end of the queue. this also avoids confusion by
462 * duplicate keys
463 */
Damien Miller0b51a522004-04-20 20:07:19 +1000464 TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
Damien Miller280ecfb2003-05-14 13:46:00 +1000465 if (key_equal(key, id->key)) {
466 sent = sign_and_send_pubkey(authctxt, id);
467 break;
468 }
469 }
470done:
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000471 if (key != NULL)
472 key_free(key);
473 xfree(pkalg);
474 xfree(pkblob);
475
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000476 /* try another method if we did not send a packet */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000477 if (sent == 0)
478 userauth(authctxt, NULL);
Damien Miller62cee002000-09-23 17:15:56 +1100479}
480
Darren Tucker0efd1552003-08-26 11:49:55 +1000481#ifdef GSSAPI
Damien Millera8e06ce2003-11-21 23:48:55 +1100482int
Darren Tucker0efd1552003-08-26 11:49:55 +1000483userauth_gssapi(Authctxt *authctxt)
484{
485 Gssctxt *gssctxt = NULL;
Darren Tucker56afe142003-11-03 20:06:14 +1100486 static gss_OID_set gss_supported = NULL;
Damien Millereccb9de2005-06-17 12:59:34 +1000487 static u_int mech = 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000488 OM_uint32 min;
489 int ok = 0;
490
491 /* Try one GSSAPI method at a time, rather than sending them all at
492 * once. */
493
Darren Tucker56afe142003-11-03 20:06:14 +1100494 if (gss_supported == NULL)
495 gss_indicate_mechs(&min, &gss_supported);
Darren Tucker0efd1552003-08-26 11:49:55 +1000496
497 /* Check to see if the mechanism is usable before we offer it */
Darren Tucker56afe142003-11-03 20:06:14 +1100498 while (mech < gss_supported->count && !ok) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000499 if (gssctxt)
500 ssh_gssapi_delete_ctx(&gssctxt);
501 ssh_gssapi_build_ctx(&gssctxt);
Darren Tucker56afe142003-11-03 20:06:14 +1100502 ssh_gssapi_set_oid(gssctxt, &gss_supported->elements[mech]);
Darren Tucker0efd1552003-08-26 11:49:55 +1000503
504 /* My DER encoding requires length<128 */
Darren Tucker56afe142003-11-03 20:06:14 +1100505 if (gss_supported->elements[mech].length < 128 &&
Darren Tucker0efd1552003-08-26 11:49:55 +1000506 !GSS_ERROR(ssh_gssapi_import_name(gssctxt,
507 authctxt->host))) {
508 ok = 1; /* Mechanism works */
509 } else {
510 mech++;
511 }
512 }
513
Damien Millereccb9de2005-06-17 12:59:34 +1000514 if (!ok)
515 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000516
517 authctxt->methoddata=(void *)gssctxt;
518
519 packet_start(SSH2_MSG_USERAUTH_REQUEST);
520 packet_put_cstring(authctxt->server_user);
521 packet_put_cstring(authctxt->service);
522 packet_put_cstring(authctxt->method->name);
523
524 packet_put_int(1);
525
Darren Tucker655a5e02003-11-03 20:09:03 +1100526 packet_put_int((gss_supported->elements[mech].length) + 2);
527 packet_put_char(SSH_GSS_OIDTYPE);
528 packet_put_char(gss_supported->elements[mech].length);
529 packet_put_raw(gss_supported->elements[mech].elements,
530 gss_supported->elements[mech].length);
Darren Tucker0efd1552003-08-26 11:49:55 +1000531
532 packet_send();
533
534 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
535 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
536 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
537 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
538
539 mech++; /* Move along to next candidate */
540
541 return 1;
542}
543
Damien Miller91c6aa42003-11-17 21:20:18 +1100544static OM_uint32
545process_gssapi_token(void *ctxt, gss_buffer_t recv_tok)
546{
547 Authctxt *authctxt = ctxt;
548 Gssctxt *gssctxt = authctxt->methoddata;
549 gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
Damien Millerda9984f2005-08-31 19:46:26 +1000550 gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
551 gss_buffer_desc gssbuf;
Damien Miller0425d402003-11-17 22:18:21 +1100552 OM_uint32 status, ms, flags;
553 Buffer b;
Damien Miller787b2ec2003-11-21 23:56:47 +1100554
Damien Miller91c6aa42003-11-17 21:20:18 +1100555 status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
Damien Miller0425d402003-11-17 22:18:21 +1100556 recv_tok, &send_tok, &flags);
Damien Miller91c6aa42003-11-17 21:20:18 +1100557
558 if (send_tok.length > 0) {
559 if (GSS_ERROR(status))
560 packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
561 else
562 packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
Damien Miller787b2ec2003-11-21 23:56:47 +1100563
Damien Miller91c6aa42003-11-17 21:20:18 +1100564 packet_put_string(send_tok.value, send_tok.length);
565 packet_send();
566 gss_release_buffer(&ms, &send_tok);
567 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100568
Damien Miller91c6aa42003-11-17 21:20:18 +1100569 if (status == GSS_S_COMPLETE) {
Damien Miller0425d402003-11-17 22:18:21 +1100570 /* send either complete or MIC, depending on mechanism */
571 if (!(flags & GSS_C_INTEG_FLAG)) {
572 packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
573 packet_send();
574 } else {
575 ssh_gssapi_buildmic(&b, authctxt->server_user,
576 authctxt->service, "gssapi-with-mic");
577
578 gssbuf.value = buffer_ptr(&b);
579 gssbuf.length = buffer_len(&b);
Damien Miller787b2ec2003-11-21 23:56:47 +1100580
Damien Miller0425d402003-11-17 22:18:21 +1100581 status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +1100582
Damien Miller0425d402003-11-17 22:18:21 +1100583 if (!GSS_ERROR(status)) {
584 packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC);
585 packet_put_string(mic.value, mic.length);
Damien Miller787b2ec2003-11-21 23:56:47 +1100586
Damien Miller0425d402003-11-17 22:18:21 +1100587 packet_send();
588 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100589
Damien Miller0425d402003-11-17 22:18:21 +1100590 buffer_free(&b);
591 gss_release_buffer(&ms, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +1100592 }
Damien Miller91c6aa42003-11-17 21:20:18 +1100593 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100594
Damien Miller91c6aa42003-11-17 21:20:18 +1100595 return status;
596}
597
Darren Tucker0efd1552003-08-26 11:49:55 +1000598void
599input_gssapi_response(int type, u_int32_t plen, void *ctxt)
600{
601 Authctxt *authctxt = ctxt;
602 Gssctxt *gssctxt;
Darren Tucker0efd1552003-08-26 11:49:55 +1000603 int oidlen;
604 char *oidv;
Darren Tucker0efd1552003-08-26 11:49:55 +1000605
606 if (authctxt == NULL)
607 fatal("input_gssapi_response: no authentication context");
608 gssctxt = authctxt->methoddata;
609
610 /* Setup our OID */
611 oidv = packet_get_string(&oidlen);
612
Darren Tucker655a5e02003-11-03 20:09:03 +1100613 if (oidlen <= 2 ||
614 oidv[0] != SSH_GSS_OIDTYPE ||
615 oidv[1] != oidlen - 2) {
Damien Miller91c6aa42003-11-17 21:20:18 +1100616 xfree(oidv);
Darren Tucker655a5e02003-11-03 20:09:03 +1100617 debug("Badly encoded mechanism OID received");
618 userauth(authctxt, NULL);
Darren Tucker655a5e02003-11-03 20:09:03 +1100619 return;
Darren Tucker0efd1552003-08-26 11:49:55 +1000620 }
621
Darren Tucker655a5e02003-11-03 20:09:03 +1100622 if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
623 fatal("Server returned different OID than expected");
624
Darren Tucker0efd1552003-08-26 11:49:55 +1000625 packet_check_eom();
626
627 xfree(oidv);
628
Damien Miller91c6aa42003-11-17 21:20:18 +1100629 if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000630 /* Start again with next method on list */
631 debug("Trying to start again");
632 userauth(authctxt, NULL);
633 return;
634 }
Darren Tucker0efd1552003-08-26 11:49:55 +1000635}
636
637void
638input_gssapi_token(int type, u_int32_t plen, void *ctxt)
639{
640 Authctxt *authctxt = ctxt;
Darren Tucker0efd1552003-08-26 11:49:55 +1000641 gss_buffer_desc recv_tok;
Damien Miller91c6aa42003-11-17 21:20:18 +1100642 OM_uint32 status;
Darren Tucker0efd1552003-08-26 11:49:55 +1000643 u_int slen;
644
645 if (authctxt == NULL)
646 fatal("input_gssapi_response: no authentication context");
Darren Tucker0efd1552003-08-26 11:49:55 +1000647
648 recv_tok.value = packet_get_string(&slen);
649 recv_tok.length = slen; /* safe typecast */
650
651 packet_check_eom();
652
Damien Miller91c6aa42003-11-17 21:20:18 +1100653 status = process_gssapi_token(ctxt, &recv_tok);
Darren Tucker0efd1552003-08-26 11:49:55 +1000654
655 xfree(recv_tok.value);
656
657 if (GSS_ERROR(status)) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000658 /* Start again with the next method in the list */
659 userauth(authctxt, NULL);
660 return;
661 }
Darren Tucker0efd1552003-08-26 11:49:55 +1000662}
663
664void
665input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
666{
667 Authctxt *authctxt = ctxt;
668 Gssctxt *gssctxt;
669 gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
670 gss_buffer_desc recv_tok;
671 OM_uint32 status, ms;
Darren Tucker600ad8d2003-08-26 12:10:48 +1000672 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +1000673
674 if (authctxt == NULL)
675 fatal("input_gssapi_response: no authentication context");
676 gssctxt = authctxt->methoddata;
677
Darren Tucker600ad8d2003-08-26 12:10:48 +1000678 recv_tok.value = packet_get_string(&len);
679 recv_tok.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +1000680
681 packet_check_eom();
682
683 /* Stick it into GSSAPI and see what it says */
684 status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
Damien Miller0dc1bef2005-07-17 17:22:45 +1000685 &recv_tok, &send_tok, NULL);
Darren Tucker0efd1552003-08-26 11:49:55 +1000686
687 xfree(recv_tok.value);
688 gss_release_buffer(&ms, &send_tok);
689
690 /* Server will be returning a failed packet after this one */
691}
692
693void
694input_gssapi_error(int type, u_int32_t plen, void *ctxt)
695{
696 OM_uint32 maj, min;
697 char *msg;
698 char *lang;
699
700 maj=packet_get_int();
701 min=packet_get_int();
702 msg=packet_get_string(NULL);
703 lang=packet_get_string(NULL);
704
705 packet_check_eom();
706
Damien Miller15d72a02005-11-05 15:07:33 +1100707 debug("Server GSSAPI Error:\n%s", msg);
Darren Tucker0efd1552003-08-26 11:49:55 +1000708 xfree(msg);
709 xfree(lang);
710}
711#endif /* GSSAPI */
712
Damien Millereba71ba2000-04-29 23:57:08 +1000713int
Damien Miller874d77b2000-10-14 16:23:11 +1100714userauth_none(Authctxt *authctxt)
715{
716 /* initial userauth request */
717 packet_start(SSH2_MSG_USERAUTH_REQUEST);
718 packet_put_cstring(authctxt->server_user);
719 packet_put_cstring(authctxt->service);
720 packet_put_cstring(authctxt->method->name);
721 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +1100722 return 1;
723}
724
725int
Damien Miller62cee002000-09-23 17:15:56 +1100726userauth_passwd(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +1000727{
Damien Millere247cc42000-05-07 12:03:14 +1000728 static int attempt = 0;
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000729 char prompt[150];
Damien Millereba71ba2000-04-29 23:57:08 +1000730 char *password;
731
Damien Millerd3a18572000-06-07 19:55:44 +1000732 if (attempt++ >= options.number_of_password_prompts)
Damien Millere247cc42000-05-07 12:03:14 +1000733 return 0;
734
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000735 if (attempt != 1)
Damien Millerd3a18572000-06-07 19:55:44 +1000736 error("Permission denied, please try again.");
737
Ben Lindstrom03df5bd2001-02-10 22:16:41 +0000738 snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
Damien Miller62cee002000-09-23 17:15:56 +1100739 authctxt->server_user, authctxt->host);
Damien Millereba71ba2000-04-29 23:57:08 +1000740 password = read_passphrase(prompt, 0);
741 packet_start(SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100742 packet_put_cstring(authctxt->server_user);
743 packet_put_cstring(authctxt->service);
Damien Miller874d77b2000-10-14 16:23:11 +1100744 packet_put_cstring(authctxt->method->name);
Damien Millereba71ba2000-04-29 23:57:08 +1000745 packet_put_char(0);
Ben Lindstrom5699c5f2001-03-05 06:17:49 +0000746 packet_put_cstring(password);
Damien Millereba71ba2000-04-29 23:57:08 +1000747 memset(password, 0, strlen(password));
748 xfree(password);
Damien Miller9f643902001-11-12 11:02:52 +1100749 packet_add_padding(64);
Damien Millereba71ba2000-04-29 23:57:08 +1000750 packet_send();
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000751
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000752 dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000753 &input_userauth_passwd_changereq);
754
Damien Millereba71ba2000-04-29 23:57:08 +1000755 return 1;
756}
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000757/*
758 * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
759 */
760void
Tim Ricec8549622002-03-31 12:49:38 -0800761input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000762{
763 Authctxt *authctxt = ctxt;
764 char *info, *lang, *password = NULL, *retype = NULL;
765 char prompt[150];
766
767 debug2("input_userauth_passwd_changereq");
768
769 if (authctxt == NULL)
770 fatal("input_userauth_passwd_changereq: "
771 "no authentication context");
772
773 info = packet_get_string(NULL);
774 lang = packet_get_string(NULL);
775 if (strlen(info) > 0)
Damien Miller996acd22003-04-09 20:59:48 +1000776 logit("%s", info);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000777 xfree(info);
778 xfree(lang);
779 packet_start(SSH2_MSG_USERAUTH_REQUEST);
780 packet_put_cstring(authctxt->server_user);
781 packet_put_cstring(authctxt->service);
782 packet_put_cstring(authctxt->method->name);
783 packet_put_char(1); /* additional info */
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000784 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000785 "Enter %.30s@%.128s's old password: ",
786 authctxt->server_user, authctxt->host);
787 password = read_passphrase(prompt, 0);
788 packet_put_cstring(password);
789 memset(password, 0, strlen(password));
790 xfree(password);
791 password = NULL;
792 while (password == NULL) {
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000793 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000794 "Enter %.30s@%.128s's new password: ",
795 authctxt->server_user, authctxt->host);
796 password = read_passphrase(prompt, RP_ALLOW_EOF);
797 if (password == NULL) {
798 /* bail out */
799 return;
800 }
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000801 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000802 "Retype %.30s@%.128s's new password: ",
803 authctxt->server_user, authctxt->host);
804 retype = read_passphrase(prompt, 0);
805 if (strcmp(password, retype) != 0) {
806 memset(password, 0, strlen(password));
807 xfree(password);
Damien Miller996acd22003-04-09 20:59:48 +1000808 logit("Mismatch; try again, EOF to quit.");
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000809 password = NULL;
810 }
811 memset(retype, 0, strlen(retype));
812 xfree(retype);
813 }
814 packet_put_cstring(password);
815 memset(password, 0, strlen(password));
816 xfree(password);
817 packet_add_padding(64);
818 packet_send();
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000819
820 dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000821 &input_userauth_passwd_changereq);
822}
Damien Millereba71ba2000-04-29 23:57:08 +1000823
Ben Lindstrombba81212001-06-25 05:01:22 +0000824static int
Damien Miller280ecfb2003-05-14 13:46:00 +1000825identity_sign(Identity *id, u_char **sigp, u_int *lenp,
826 u_char *data, u_int datalen)
827{
828 Key *prv;
829 int ret;
830
831 /* the agent supports this key */
832 if (id->ac)
833 return (ssh_agent_sign(id->ac, id->key, sigp, lenp,
834 data, datalen));
835 /*
836 * we have already loaded the private key or
837 * the private key is stored in external hardware
838 */
839 if (id->isprivate || (id->key->flags & KEY_FLAG_EXT))
840 return (key_sign(id->key, sigp, lenp, data, datalen));
841 /* load the private key from the file */
842 if ((prv = load_identity_file(id->filename)) == NULL)
843 return (-1);
844 ret = key_sign(prv, sigp, lenp, data, datalen);
845 key_free(prv);
846 return (ret);
847}
848
849static int
850sign_and_send_pubkey(Authctxt *authctxt, Identity *id)
Damien Millereba71ba2000-04-29 23:57:08 +1000851{
852 Buffer b;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000853 u_char *blob, *signature;
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000854 u_int bloblen, slen;
Darren Tucker502d3842003-06-28 12:38:01 +1000855 u_int skip = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000856 int ret = -1;
Damien Miller874d77b2000-10-14 16:23:11 +1100857 int have_sig = 1;
Damien Millereba71ba2000-04-29 23:57:08 +1000858
Ben Lindstromd121f612000-12-03 17:00:47 +0000859 debug3("sign_and_send_pubkey");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000860
Damien Miller280ecfb2003-05-14 13:46:00 +1000861 if (key_to_blob(id->key, &blob, &bloblen) == 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100862 /* we cannot handle this key */
Ben Lindstromd121f612000-12-03 17:00:47 +0000863 debug3("sign_and_send_pubkey: cannot handle key");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100864 return 0;
865 }
Damien Millereba71ba2000-04-29 23:57:08 +1000866 /* data to be signed */
867 buffer_init(&b);
Damien Miller50a41ed2000-10-16 12:14:42 +1100868 if (datafellows & SSH_OLD_SESSIONID) {
Damien Miller6536c7d2000-06-22 21:32:31 +1000869 buffer_append(&b, session_id2, session_id2_len);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000870 skip = session_id2_len;
Damien Miller50a41ed2000-10-16 12:14:42 +1100871 } else {
872 buffer_put_string(&b, session_id2, session_id2_len);
873 skip = buffer_len(&b);
Damien Miller6536c7d2000-06-22 21:32:31 +1000874 }
Damien Millereba71ba2000-04-29 23:57:08 +1000875 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100876 buffer_put_cstring(&b, authctxt->server_user);
Damien Miller30c3d422000-05-09 11:02:59 +1000877 buffer_put_cstring(&b,
Ben Lindstromd121f612000-12-03 17:00:47 +0000878 datafellows & SSH_BUG_PKSERVICE ?
Damien Miller30c3d422000-05-09 11:02:59 +1000879 "ssh-userauth" :
Damien Miller62cee002000-09-23 17:15:56 +1100880 authctxt->service);
Ben Lindstromd121f612000-12-03 17:00:47 +0000881 if (datafellows & SSH_BUG_PKAUTH) {
882 buffer_put_char(&b, have_sig);
883 } else {
884 buffer_put_cstring(&b, authctxt->method->name);
885 buffer_put_char(&b, have_sig);
Damien Miller280ecfb2003-05-14 13:46:00 +1000886 buffer_put_cstring(&b, key_ssh_name(id->key));
Ben Lindstromd121f612000-12-03 17:00:47 +0000887 }
Damien Millereba71ba2000-04-29 23:57:08 +1000888 buffer_put_string(&b, blob, bloblen);
Damien Millereba71ba2000-04-29 23:57:08 +1000889
890 /* generate signature */
Damien Miller280ecfb2003-05-14 13:46:00 +1000891 ret = identity_sign(id, &signature, &slen,
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000892 buffer_ptr(&b), buffer_len(&b));
Damien Millerad833b32000-08-23 10:46:23 +1000893 if (ret == -1) {
894 xfree(blob);
895 buffer_free(&b);
896 return 0;
897 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100898#ifdef DEBUG_PK
Damien Millereba71ba2000-04-29 23:57:08 +1000899 buffer_dump(&b);
900#endif
Ben Lindstromd121f612000-12-03 17:00:47 +0000901 if (datafellows & SSH_BUG_PKSERVICE) {
Damien Miller30c3d422000-05-09 11:02:59 +1000902 buffer_clear(&b);
903 buffer_append(&b, session_id2, session_id2_len);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000904 skip = session_id2_len;
Damien Miller30c3d422000-05-09 11:02:59 +1000905 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100906 buffer_put_cstring(&b, authctxt->server_user);
907 buffer_put_cstring(&b, authctxt->service);
Damien Miller874d77b2000-10-14 16:23:11 +1100908 buffer_put_cstring(&b, authctxt->method->name);
909 buffer_put_char(&b, have_sig);
Ben Lindstromd121f612000-12-03 17:00:47 +0000910 if (!(datafellows & SSH_BUG_PKAUTH))
Damien Miller280ecfb2003-05-14 13:46:00 +1000911 buffer_put_cstring(&b, key_ssh_name(id->key));
Damien Miller30c3d422000-05-09 11:02:59 +1000912 buffer_put_string(&b, blob, bloblen);
913 }
914 xfree(blob);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000915
Damien Millereba71ba2000-04-29 23:57:08 +1000916 /* append signature */
917 buffer_put_string(&b, signature, slen);
918 xfree(signature);
919
920 /* skip session id and packet type */
Damien Miller6536c7d2000-06-22 21:32:31 +1000921 if (buffer_len(&b) < skip + 1)
Damien Miller62cee002000-09-23 17:15:56 +1100922 fatal("userauth_pubkey: internal error");
Damien Miller6536c7d2000-06-22 21:32:31 +1000923 buffer_consume(&b, skip + 1);
Damien Millereba71ba2000-04-29 23:57:08 +1000924
925 /* put remaining data from buffer into packet */
926 packet_start(SSH2_MSG_USERAUTH_REQUEST);
927 packet_put_raw(buffer_ptr(&b), buffer_len(&b));
928 buffer_free(&b);
Damien Millereba71ba2000-04-29 23:57:08 +1000929 packet_send();
Damien Millerad833b32000-08-23 10:46:23 +1000930
931 return 1;
Damien Miller994cf142000-07-21 10:19:44 +1000932}
933
Ben Lindstrombba81212001-06-25 05:01:22 +0000934static int
Damien Miller280ecfb2003-05-14 13:46:00 +1000935send_pubkey_test(Authctxt *authctxt, Identity *id)
Damien Miller994cf142000-07-21 10:19:44 +1000936{
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000937 u_char *blob;
Ben Lindstromc58ab022002-02-26 18:15:09 +0000938 u_int bloblen, have_sig = 0;
Damien Miller994cf142000-07-21 10:19:44 +1000939
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000940 debug3("send_pubkey_test");
941
Damien Miller280ecfb2003-05-14 13:46:00 +1000942 if (key_to_blob(id->key, &blob, &bloblen) == 0) {
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000943 /* we cannot handle this key */
944 debug3("send_pubkey_test: cannot handle key");
Damien Miller994cf142000-07-21 10:19:44 +1000945 return 0;
946 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000947 /* register callback for USERAUTH_PK_OK message */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000948 dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
Damien Miller994cf142000-07-21 10:19:44 +1000949
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000950 packet_start(SSH2_MSG_USERAUTH_REQUEST);
951 packet_put_cstring(authctxt->server_user);
952 packet_put_cstring(authctxt->service);
953 packet_put_cstring(authctxt->method->name);
954 packet_put_char(have_sig);
955 if (!(datafellows & SSH_BUG_PKAUTH))
Damien Miller280ecfb2003-05-14 13:46:00 +1000956 packet_put_cstring(key_ssh_name(id->key));
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000957 packet_put_string(blob, bloblen);
958 xfree(blob);
959 packet_send();
960 return 1;
961}
962
Ben Lindstrombba81212001-06-25 05:01:22 +0000963static Key *
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000964load_identity_file(char *filename)
965{
966 Key *private;
967 char prompt[300], *passphrase;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000968 int quit, i;
Ben Lindstrom329782e2001-03-10 17:08:59 +0000969 struct stat st;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000970
Ben Lindstrom329782e2001-03-10 17:08:59 +0000971 if (stat(filename, &st) < 0) {
972 debug3("no such identity: %s", filename);
973 return NULL;
974 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000975 private = key_load_private_type(KEY_UNSPEC, filename, "", NULL);
976 if (private == NULL) {
977 if (options.batch_mode)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000978 return NULL;
Damien Miller994cf142000-07-21 10:19:44 +1000979 snprintf(prompt, sizeof prompt,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100980 "Enter passphrase for key '%.100s': ", filename);
Damien Miller62cee002000-09-23 17:15:56 +1100981 for (i = 0; i < options.number_of_password_prompts; i++) {
982 passphrase = read_passphrase(prompt, 0);
983 if (strcmp(passphrase, "") != 0) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000984 private = key_load_private_type(KEY_UNSPEC, filename,
985 passphrase, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000986 quit = 0;
Damien Miller62cee002000-09-23 17:15:56 +1100987 } else {
988 debug2("no passphrase given, try next key");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000989 quit = 1;
Damien Miller62cee002000-09-23 17:15:56 +1100990 }
991 memset(passphrase, 0, strlen(passphrase));
992 xfree(passphrase);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000993 if (private != NULL || quit)
Damien Miller62cee002000-09-23 17:15:56 +1100994 break;
995 debug2("bad passphrase given, try again...");
996 }
Damien Miller994cf142000-07-21 10:19:44 +1000997 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000998 return private;
999}
1000
Damien Miller280ecfb2003-05-14 13:46:00 +10001001/*
1002 * try keys in the following order:
1003 * 1. agent keys that are found in the config file
1004 * 2. other agent keys
1005 * 3. keys that are only listed in the config file
1006 */
1007static void
1008pubkey_prepare(Authctxt *authctxt)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001009{
Damien Miller280ecfb2003-05-14 13:46:00 +10001010 Identity *id;
1011 Idlist agent, files, *preferred;
1012 Key *key;
1013 AuthenticationConnection *ac;
Damien Millerad833b32000-08-23 10:46:23 +10001014 char *comment;
Damien Miller280ecfb2003-05-14 13:46:00 +10001015 int i, found;
Damien Millerad833b32000-08-23 10:46:23 +10001016
Damien Miller280ecfb2003-05-14 13:46:00 +10001017 TAILQ_INIT(&agent); /* keys from the agent */
1018 TAILQ_INIT(&files); /* keys from the config file */
1019 preferred = &authctxt->keys;
1020 TAILQ_INIT(preferred); /* preferred order of keys */
1021
1022 /* list of keys stored in the filesystem */
1023 for (i = 0; i < options.num_identity_files; i++) {
1024 key = options.identity_keys[i];
1025 if (key && key->type == KEY_RSA1)
1026 continue;
1027 options.identity_keys[i] = NULL;
1028 id = xmalloc(sizeof(*id));
1029 memset(id, 0, sizeof(*id));
1030 id->key = key;
1031 id->filename = xstrdup(options.identity_files[i]);
1032 TAILQ_INSERT_TAIL(&files, id, next);
Damien Millerad833b32000-08-23 10:46:23 +10001033 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001034 /* list of keys supported by the agent */
1035 if ((ac = ssh_get_authentication_connection())) {
1036 for (key = ssh_get_first_identity(ac, &comment, 2);
1037 key != NULL;
1038 key = ssh_get_next_identity(ac, &comment, 2)) {
1039 found = 0;
1040 TAILQ_FOREACH(id, &files, next) {
Damien Millera8e06ce2003-11-21 23:48:55 +11001041 /* agent keys from the config file are preferred */
Damien Miller280ecfb2003-05-14 13:46:00 +10001042 if (key_equal(key, id->key)) {
1043 key_free(key);
1044 xfree(comment);
1045 TAILQ_REMOVE(&files, id, next);
1046 TAILQ_INSERT_TAIL(preferred, id, next);
1047 id->ac = ac;
1048 found = 1;
1049 break;
1050 }
1051 }
Damien Millerbd394c32004-03-08 23:12:36 +11001052 if (!found && !options.identities_only) {
Damien Miller280ecfb2003-05-14 13:46:00 +10001053 id = xmalloc(sizeof(*id));
1054 memset(id, 0, sizeof(*id));
1055 id->key = key;
1056 id->filename = comment;
1057 id->ac = ac;
1058 TAILQ_INSERT_TAIL(&agent, id, next);
1059 }
1060 }
1061 /* append remaining agent keys */
1062 for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1063 TAILQ_REMOVE(&agent, id, next);
1064 TAILQ_INSERT_TAIL(preferred, id, next);
1065 }
1066 authctxt->agent = ac;
Damien Miller62cee002000-09-23 17:15:56 +11001067 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001068 /* append remaining keys from the config file */
1069 for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1070 TAILQ_REMOVE(&files, id, next);
1071 TAILQ_INSERT_TAIL(preferred, id, next);
1072 }
1073 TAILQ_FOREACH(id, preferred, next) {
1074 debug2("key: %s (%p)", id->filename, id->key);
1075 }
1076}
1077
1078static void
1079pubkey_cleanup(Authctxt *authctxt)
1080{
1081 Identity *id;
1082
1083 if (authctxt->agent != NULL)
1084 ssh_close_authentication_connection(authctxt->agent);
1085 for (id = TAILQ_FIRST(&authctxt->keys); id;
1086 id = TAILQ_FIRST(&authctxt->keys)) {
1087 TAILQ_REMOVE(&authctxt->keys, id, next);
1088 if (id->key)
1089 key_free(id->key);
1090 if (id->filename)
1091 xfree(id->filename);
1092 xfree(id);
1093 }
Damien Millereba71ba2000-04-29 23:57:08 +10001094}
1095
Damien Miller62cee002000-09-23 17:15:56 +11001096int
1097userauth_pubkey(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +10001098{
Damien Miller280ecfb2003-05-14 13:46:00 +10001099 Identity *id;
Damien Miller62cee002000-09-23 17:15:56 +11001100 int sent = 0;
Damien Millereba71ba2000-04-29 23:57:08 +10001101
Damien Miller280ecfb2003-05-14 13:46:00 +10001102 while ((id = TAILQ_FIRST(&authctxt->keys))) {
1103 if (id->tried++)
1104 return (0);
Darren Tuckerd05b6012003-10-15 15:55:59 +10001105 /* move key to the end of the queue */
Damien Miller280ecfb2003-05-14 13:46:00 +10001106 TAILQ_REMOVE(&authctxt->keys, id, next);
1107 TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1108 /*
1109 * send a test message if we have the public key. for
1110 * encrypted keys we cannot do this and have to load the
1111 * private key instead
1112 */
1113 if (id->key && id->key->type != KEY_RSA1) {
1114 debug("Offering public key: %s", id->filename);
1115 sent = send_pubkey_test(authctxt, id);
1116 } else if (id->key == NULL) {
1117 debug("Trying private key: %s", id->filename);
1118 id->key = load_identity_file(id->filename);
1119 if (id->key != NULL) {
1120 id->isprivate = 1;
1121 sent = sign_and_send_pubkey(authctxt, id);
1122 key_free(id->key);
1123 id->key = NULL;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001124 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001125 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001126 if (sent)
1127 return (sent);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001128 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001129 return (0);
Damien Miller62cee002000-09-23 17:15:56 +11001130}
Damien Millereba71ba2000-04-29 23:57:08 +10001131
Damien Miller874d77b2000-10-14 16:23:11 +11001132/*
1133 * Send userauth request message specifying keyboard-interactive method.
1134 */
1135int
1136userauth_kbdint(Authctxt *authctxt)
1137{
1138 static int attempt = 0;
1139
1140 if (attempt++ >= options.number_of_password_prompts)
1141 return 0;
Ben Lindstrom7d199962001-09-12 18:29:00 +00001142 /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1143 if (attempt > 1 && !authctxt->info_req_seen) {
1144 debug3("userauth_kbdint: disable: no info_req_seen");
1145 dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1146 return 0;
1147 }
Damien Miller874d77b2000-10-14 16:23:11 +11001148
1149 debug2("userauth_kbdint");
1150 packet_start(SSH2_MSG_USERAUTH_REQUEST);
1151 packet_put_cstring(authctxt->server_user);
1152 packet_put_cstring(authctxt->service);
1153 packet_put_cstring(authctxt->method->name);
1154 packet_put_cstring(""); /* lang */
1155 packet_put_cstring(options.kbd_interactive_devices ?
1156 options.kbd_interactive_devices : "");
1157 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +11001158
1159 dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1160 return 1;
1161}
1162
1163/*
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001164 * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
Damien Miller874d77b2000-10-14 16:23:11 +11001165 */
1166void
Damien Miller630d6f42002-01-22 23:17:30 +11001167input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
Damien Miller874d77b2000-10-14 16:23:11 +11001168{
1169 Authctxt *authctxt = ctxt;
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001170 char *name, *inst, *lang, *prompt, *response;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001171 u_int num_prompts, i;
Damien Miller874d77b2000-10-14 16:23:11 +11001172 int echo = 0;
1173
1174 debug2("input_userauth_info_req");
1175
1176 if (authctxt == NULL)
1177 fatal("input_userauth_info_req: no authentication context");
1178
Ben Lindstrom7d199962001-09-12 18:29:00 +00001179 authctxt->info_req_seen = 1;
1180
Damien Miller874d77b2000-10-14 16:23:11 +11001181 name = packet_get_string(NULL);
1182 inst = packet_get_string(NULL);
1183 lang = packet_get_string(NULL);
Damien Miller874d77b2000-10-14 16:23:11 +11001184 if (strlen(name) > 0)
Damien Miller996acd22003-04-09 20:59:48 +10001185 logit("%s", name);
Damien Miller874d77b2000-10-14 16:23:11 +11001186 if (strlen(inst) > 0)
Damien Miller996acd22003-04-09 20:59:48 +10001187 logit("%s", inst);
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001188 xfree(name);
Damien Miller874d77b2000-10-14 16:23:11 +11001189 xfree(inst);
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001190 xfree(lang);
Damien Miller874d77b2000-10-14 16:23:11 +11001191
1192 num_prompts = packet_get_int();
1193 /*
1194 * Begin to build info response packet based on prompts requested.
1195 * We commit to providing the correct number of responses, so if
1196 * further on we run into a problem that prevents this, we have to
1197 * be sure and clean this up and send a correct error response.
1198 */
1199 packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
1200 packet_put_int(num_prompts);
1201
Ben Lindstrom551ea372001-06-05 18:56:16 +00001202 debug2("input_userauth_info_req: num_prompts %d", num_prompts);
Damien Miller874d77b2000-10-14 16:23:11 +11001203 for (i = 0; i < num_prompts; i++) {
1204 prompt = packet_get_string(NULL);
1205 echo = packet_get_char();
1206
Ben Lindstrom949974b2001-06-25 05:20:31 +00001207 response = read_passphrase(prompt, echo ? RP_ECHO : 0);
Damien Miller874d77b2000-10-14 16:23:11 +11001208
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001209 packet_put_cstring(response);
Damien Miller874d77b2000-10-14 16:23:11 +11001210 memset(response, 0, strlen(response));
1211 xfree(response);
1212 xfree(prompt);
1213 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001214 packet_check_eom(); /* done with parsing incoming message. */
Damien Miller874d77b2000-10-14 16:23:11 +11001215
Damien Miller9f643902001-11-12 11:02:52 +11001216 packet_add_padding(64);
Damien Miller874d77b2000-10-14 16:23:11 +11001217 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +11001218}
Damien Miller62cee002000-09-23 17:15:56 +11001219
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001220static int
Ben Lindstrom5c385522002-06-23 21:23:20 +00001221ssh_keysign(Key *key, u_char **sigp, u_int *lenp,
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001222 u_char *data, u_int datalen)
1223{
1224 Buffer b;
Ben Lindstrom5206b952002-06-06 19:59:29 +00001225 struct stat st;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001226 pid_t pid;
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001227 int to[2], from[2], status, version = 2;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001228
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001229 debug2("ssh_keysign called");
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001230
Ben Lindstrom5206b952002-06-06 19:59:29 +00001231 if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1232 error("ssh_keysign: no installed: %s", strerror(errno));
1233 return -1;
1234 }
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001235 if (fflush(stdout) != 0)
1236 error("ssh_keysign: fflush: %s", strerror(errno));
1237 if (pipe(to) < 0) {
1238 error("ssh_keysign: pipe: %s", strerror(errno));
1239 return -1;
1240 }
1241 if (pipe(from) < 0) {
1242 error("ssh_keysign: pipe: %s", strerror(errno));
1243 return -1;
1244 }
1245 if ((pid = fork()) < 0) {
1246 error("ssh_keysign: fork: %s", strerror(errno));
1247 return -1;
1248 }
1249 if (pid == 0) {
1250 seteuid(getuid());
1251 setuid(getuid());
1252 close(from[0]);
1253 if (dup2(from[1], STDOUT_FILENO) < 0)
1254 fatal("ssh_keysign: dup2: %s", strerror(errno));
1255 close(to[1]);
1256 if (dup2(to[0], STDIN_FILENO) < 0)
1257 fatal("ssh_keysign: dup2: %s", strerror(errno));
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001258 close(from[1]);
1259 close(to[0]);
Ben Lindstrom4887da22002-06-06 20:05:57 +00001260 execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001261 fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN,
1262 strerror(errno));
1263 }
1264 close(from[1]);
1265 close(to[0]);
1266
1267 buffer_init(&b);
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001268 buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001269 buffer_put_string(&b, data, datalen);
Damien Miller51bf11f2003-11-17 21:20:47 +11001270 if (ssh_msg_send(to[1], version, &b) == -1)
1271 fatal("ssh_keysign: couldn't send request");
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001272
Damien Miller901119b2002-10-04 11:10:04 +10001273 if (ssh_msg_recv(from[0], &b) < 0) {
Ben Lindstrom5206b952002-06-06 19:59:29 +00001274 error("ssh_keysign: no reply");
Damien Millerfb1310e2004-01-21 11:02:50 +11001275 buffer_free(&b);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001276 return -1;
1277 }
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001278 close(from[0]);
1279 close(to[1]);
1280
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001281 while (waitpid(pid, &status, 0) < 0)
1282 if (errno != EINTR)
1283 break;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001284
Ben Lindstrom5206b952002-06-06 19:59:29 +00001285 if (buffer_get_char(&b) != version) {
1286 error("ssh_keysign: bad version");
Damien Millerfb1310e2004-01-21 11:02:50 +11001287 buffer_free(&b);
Ben Lindstrom5206b952002-06-06 19:59:29 +00001288 return -1;
1289 }
1290 *sigp = buffer_get_string(&b, lenp);
Damien Millerfb1310e2004-01-21 11:02:50 +11001291 buffer_free(&b);
Ben Lindstrom5206b952002-06-06 19:59:29 +00001292
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001293 return 0;
1294}
1295
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001296int
1297userauth_hostbased(Authctxt *authctxt)
1298{
1299 Key *private = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001300 Sensitive *sensitive = authctxt->sensitive;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001301 Buffer b;
1302 u_char *signature, *blob;
1303 char *chost, *pkalg, *p;
Ben Lindstrom671388f2001-04-19 20:40:45 +00001304 const char *service;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001305 u_int blen, slen;
Ben Lindstrom2bffd6f2001-04-19 20:35:40 +00001306 int ok, i, len, found = 0;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001307
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001308 /* check for a useful key */
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001309 for (i = 0; i < sensitive->nkeys; i++) {
1310 private = sensitive->keys[i];
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001311 if (private && private->type != KEY_RSA1) {
1312 found = 1;
1313 /* we take and free the key */
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001314 sensitive->keys[i] = NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001315 break;
1316 }
1317 }
1318 if (!found) {
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001319 debug("No more client hostkeys for hostbased authentication.");
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001320 return 0;
1321 }
1322 if (key_to_blob(private, &blob, &blen) == 0) {
1323 key_free(private);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001324 return 0;
1325 }
Damien Miller91c18472001-11-12 11:02:03 +11001326 /* figure out a name for the client host */
1327 p = get_local_name(packet_get_connection_in());
1328 if (p == NULL) {
1329 error("userauth_hostbased: cannot get local ipaddr/name");
1330 key_free(private);
1331 return 0;
1332 }
1333 len = strlen(p) + 2;
1334 chost = xmalloc(len);
1335 strlcpy(chost, p, len);
1336 strlcat(chost, ".", len);
1337 debug2("userauth_hostbased: chost %s", chost);
Damien Miller00111382003-03-10 11:21:17 +11001338 xfree(p);
Damien Miller91c18472001-11-12 11:02:03 +11001339
Ben Lindstrom671388f2001-04-19 20:40:45 +00001340 service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
1341 authctxt->service;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001342 pkalg = xstrdup(key_ssh_name(private));
1343 buffer_init(&b);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001344 /* construct data */
Ben Lindstrom671388f2001-04-19 20:40:45 +00001345 buffer_put_string(&b, session_id2, session_id2_len);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001346 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1347 buffer_put_cstring(&b, authctxt->server_user);
Ben Lindstrom671388f2001-04-19 20:40:45 +00001348 buffer_put_cstring(&b, service);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001349 buffer_put_cstring(&b, authctxt->method->name);
1350 buffer_put_cstring(&b, pkalg);
1351 buffer_put_string(&b, blob, blen);
1352 buffer_put_cstring(&b, chost);
1353 buffer_put_cstring(&b, authctxt->local_user);
1354#ifdef DEBUG_PK
1355 buffer_dump(&b);
1356#endif
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001357 if (sensitive->external_keysign)
1358 ok = ssh_keysign(private, &signature, &slen,
1359 buffer_ptr(&b), buffer_len(&b));
1360 else
1361 ok = key_sign(private, &signature, &slen,
1362 buffer_ptr(&b), buffer_len(&b));
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001363 key_free(private);
1364 buffer_free(&b);
1365 if (ok != 0) {
1366 error("key_sign failed");
1367 xfree(chost);
1368 xfree(pkalg);
1369 return 0;
1370 }
1371 packet_start(SSH2_MSG_USERAUTH_REQUEST);
1372 packet_put_cstring(authctxt->server_user);
1373 packet_put_cstring(authctxt->service);
1374 packet_put_cstring(authctxt->method->name);
1375 packet_put_cstring(pkalg);
1376 packet_put_string(blob, blen);
1377 packet_put_cstring(chost);
1378 packet_put_cstring(authctxt->local_user);
1379 packet_put_string(signature, slen);
1380 memset(signature, 's', slen);
1381 xfree(signature);
1382 xfree(chost);
1383 xfree(pkalg);
1384
1385 packet_send();
1386 return 1;
1387}
1388
Damien Miller62cee002000-09-23 17:15:56 +11001389/* find auth method */
1390
Damien Miller62cee002000-09-23 17:15:56 +11001391/*
1392 * given auth method name, if configurable options permit this method fill
1393 * in auth_ident field and return true, otherwise return false.
1394 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001395static int
Damien Miller62cee002000-09-23 17:15:56 +11001396authmethod_is_enabled(Authmethod *method)
1397{
1398 if (method == NULL)
1399 return 0;
1400 /* return false if options indicate this method is disabled */
1401 if (method->enabled == NULL || *method->enabled == 0)
1402 return 0;
1403 /* return false if batch mode is enabled but method needs interactive mode */
1404 if (method->batch_flag != NULL && *method->batch_flag != 0)
1405 return 0;
1406 return 1;
1407}
1408
Ben Lindstrombba81212001-06-25 05:01:22 +00001409static Authmethod *
Damien Miller62cee002000-09-23 17:15:56 +11001410authmethod_lookup(const char *name)
1411{
1412 Authmethod *method = NULL;
1413 if (name != NULL)
1414 for (method = authmethods; method->name != NULL; method++)
1415 if (strcmp(name, method->name) == 0)
1416 return method;
1417 debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
1418 return NULL;
1419}
1420
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001421/* XXX internal state */
1422static Authmethod *current = NULL;
1423static char *supported = NULL;
1424static char *preferred = NULL;
Ben Lindstrom5c385522002-06-23 21:23:20 +00001425
Damien Miller62cee002000-09-23 17:15:56 +11001426/*
1427 * Given the authentication method list sent by the server, return the
1428 * next method we should try. If the server initially sends a nil list,
Ben Lindstroma3700052001-04-05 23:26:32 +00001429 * use a built-in default list.
Kevin Stevesef4eea92001-02-05 12:42:17 +00001430 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001431static Authmethod *
Damien Miller62cee002000-09-23 17:15:56 +11001432authmethod_get(char *authlist)
1433{
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001434 char *name = NULL;
Ben Lindstromc58ab022002-02-26 18:15:09 +00001435 u_int next;
Kevin Stevesef4eea92001-02-05 12:42:17 +00001436
Damien Miller62cee002000-09-23 17:15:56 +11001437 /* Use a suitable default if we're passed a nil list. */
1438 if (authlist == NULL || strlen(authlist) == 0)
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001439 authlist = options.preferred_authentications;
Damien Miller62cee002000-09-23 17:15:56 +11001440
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001441 if (supported == NULL || strcmp(authlist, supported) != 0) {
1442 debug3("start over, passed a different list %s", authlist);
1443 if (supported != NULL)
1444 xfree(supported);
1445 supported = xstrdup(authlist);
1446 preferred = options.preferred_authentications;
1447 debug3("preferred %s", preferred);
1448 current = NULL;
1449 } else if (current != NULL && authmethod_is_enabled(current))
1450 return current;
Damien Millereba71ba2000-04-29 23:57:08 +10001451
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001452 for (;;) {
1453 if ((name = match_list(preferred, supported, &next)) == NULL) {
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001454 debug("No more authentication methods to try.");
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001455 current = NULL;
1456 return NULL;
Damien Miller874d77b2000-10-14 16:23:11 +11001457 }
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001458 preferred += next;
1459 debug3("authmethod_lookup %s", name);
1460 debug3("remaining preferred: %s", preferred);
1461 if ((current = authmethod_lookup(name)) != NULL &&
1462 authmethod_is_enabled(current)) {
1463 debug3("authmethod_is_enabled %s", name);
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001464 debug("Next authentication method: %s", name);
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001465 return current;
1466 }
Damien Millereba71ba2000-04-29 23:57:08 +10001467 }
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001468}
Damien Miller62cee002000-09-23 17:15:56 +11001469
Ben Lindstrom79073822001-07-04 03:42:30 +00001470static char *
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001471authmethods_get(void)
1472{
1473 Authmethod *method = NULL;
Damien Miller0e3b8722002-01-22 23:26:38 +11001474 Buffer b;
1475 char *list;
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001476
Damien Miller0e3b8722002-01-22 23:26:38 +11001477 buffer_init(&b);
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001478 for (method = authmethods; method->name != NULL; method++) {
1479 if (authmethod_is_enabled(method)) {
Damien Miller0e3b8722002-01-22 23:26:38 +11001480 if (buffer_len(&b) > 0)
1481 buffer_append(&b, ",", 1);
1482 buffer_append(&b, method->name, strlen(method->name));
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001483 }
Damien Miller62cee002000-09-23 17:15:56 +11001484 }
Damien Miller0e3b8722002-01-22 23:26:38 +11001485 buffer_append(&b, "\0", 1);
1486 list = xstrdup(buffer_ptr(&b));
1487 buffer_free(&b);
1488 return list;
Damien Millereba71ba2000-04-29 23:57:08 +10001489}