blob: 2467d235c6b7d3986bec2119b21e9912c5de8ea5 [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 Millera63128d2006-03-15 12:08:28 +110026RCSID("$OpenBSD: sshconnect2.c,v 1.147 2006/03/07 09:07:40 djm Exp $");
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 Miller874d77b2000-10-14 16:23:11 +110056
Darren Tucker0efd1552003-08-26 11:49:55 +100057#ifdef GSSAPI
58#include "ssh-gss.h"
59#endif
60
Damien Millereba71ba2000-04-29 23:57:08 +100061/* import */
62extern char *client_version_string;
63extern char *server_version_string;
64extern Options options;
65
66/*
67 * SSH2 key exchange
68 */
69
Ben Lindstrom46c16222000-12-22 01:43:59 +000070u_char *session_id2 = NULL;
Darren Tucker502d3842003-06-28 12:38:01 +100071u_int session_id2_len = 0;
Damien Millereba71ba2000-04-29 23:57:08 +100072
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000073char *xxx_host;
74struct sockaddr *xxx_hostaddr;
75
Ben Lindstromf28f6342001-04-04 02:03:04 +000076Kex *xxx_kex = NULL;
77
Ben Lindstrombba81212001-06-25 05:01:22 +000078static int
Ben Lindstromd6481ea2001-06-25 04:37:41 +000079verify_host_key_callback(Key *hostkey)
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000080{
Ben Lindstromd6481ea2001-06-25 04:37:41 +000081 if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
Damien Miller59d9fb92001-10-10 15:03:11 +100082 fatal("Host key verification failed.");
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000083 return 0;
84}
85
Damien Millereba71ba2000-04-29 23:57:08 +100086void
Damien Miller874d77b2000-10-14 16:23:11 +110087ssh_kex2(char *host, struct sockaddr *hostaddr)
88{
Damien Miller874d77b2000-10-14 16:23:11 +110089 Kex *kex;
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000090
91 xxx_host = host;
92 xxx_hostaddr = hostaddr;
Damien Miller874d77b2000-10-14 16:23:11 +110093
Damien Millere39cacc2000-11-29 12:18:44 +110094 if (options.ciphers == (char *)-1) {
Damien Miller996acd22003-04-09 20:59:48 +100095 logit("No valid ciphers for protocol version 2 given, using defaults.");
Damien Millere39cacc2000-11-29 12:18:44 +110096 options.ciphers = NULL;
Damien Miller874d77b2000-10-14 16:23:11 +110097 }
98 if (options.ciphers != NULL) {
99 myproposal[PROPOSAL_ENC_ALGS_CTOS] =
100 myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
101 }
Damien Millera0ff4662001-03-30 10:49:35 +1000102 myproposal[PROPOSAL_ENC_ALGS_CTOS] =
103 compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
104 myproposal[PROPOSAL_ENC_ALGS_STOC] =
105 compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]);
Damien Miller874d77b2000-10-14 16:23:11 +1100106 if (options.compression) {
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000107 myproposal[PROPOSAL_COMP_ALGS_CTOS] =
Damien Miller9786e6e2005-07-26 21:54:56 +1000108 myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none";
Damien Miller874d77b2000-10-14 16:23:11 +1100109 } else {
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000110 myproposal[PROPOSAL_COMP_ALGS_CTOS] =
Damien Miller9786e6e2005-07-26 21:54:56 +1000111 myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib";
Damien Miller874d77b2000-10-14 16:23:11 +1100112 }
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000113 if (options.macs != NULL) {
114 myproposal[PROPOSAL_MAC_ALGS_CTOS] =
115 myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
116 }
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000117 if (options.hostkeyalgorithms != NULL)
Damien Miller9f0f5c62001-12-21 14:45:46 +1100118 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000119 options.hostkeyalgorithms;
Damien Miller874d77b2000-10-14 16:23:11 +1100120
Damien Millera5539d22003-04-09 20:50:06 +1000121 if (options.rekey_limit)
122 packet_set_rekey_limit(options.rekey_limit);
123
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000124 /* start key exchange */
Ben Lindstrom238abf62001-04-04 17:52:53 +0000125 kex = kex_setup(myproposal);
Damien Miller8e7fb332003-02-24 12:03:03 +1100126 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
Damien Millerf675fc42004-06-15 10:30:09 +1000127 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
Damien Miller8e7fb332003-02-24 12:03:03 +1100128 kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
Damien Millera63128d2006-03-15 12:08:28 +1100129 kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000130 kex->client_version_string=client_version_string;
131 kex->server_version_string=server_version_string;
Ben Lindstromd6481ea2001-06-25 04:37:41 +0000132 kex->verify_host_key=&verify_host_key_callback;
Damien Miller874d77b2000-10-14 16:23:11 +1100133
Ben Lindstromf28f6342001-04-04 02:03:04 +0000134 xxx_kex = kex;
135
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000136 dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
Damien Miller874d77b2000-10-14 16:23:11 +1100137
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000138 session_id2 = kex->session_id;
139 session_id2_len = kex->session_id_len;
140
Damien Miller874d77b2000-10-14 16:23:11 +1100141#ifdef DEBUG_KEXDH
142 /* send 1st encrypted/maced/compressed message */
143 packet_start(SSH2_MSG_IGNORE);
144 packet_put_cstring("markus");
145 packet_send();
146 packet_write_wait();
147#endif
Damien Millereba71ba2000-04-29 23:57:08 +1000148}
Damien Millerb1715dc2000-05-30 13:44:51 +1000149
Damien Millereba71ba2000-04-29 23:57:08 +1000150/*
151 * Authenticate user
152 */
Damien Miller62cee002000-09-23 17:15:56 +1100153
154typedef struct Authctxt Authctxt;
155typedef struct Authmethod Authmethod;
Damien Miller280ecfb2003-05-14 13:46:00 +1000156typedef struct identity Identity;
157typedef struct idlist Idlist;
Damien Miller62cee002000-09-23 17:15:56 +1100158
Damien Miller280ecfb2003-05-14 13:46:00 +1000159struct identity {
160 TAILQ_ENTRY(identity) next;
161 AuthenticationConnection *ac; /* set if agent supports key */
162 Key *key; /* public/private key */
163 char *filename; /* comment for agent-only keys */
164 int tried;
165 int isprivate; /* key points to the private key */
166};
167TAILQ_HEAD(idlist, identity);
Damien Miller62cee002000-09-23 17:15:56 +1100168
169struct Authctxt {
170 const char *server_user;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000171 const char *local_user;
Damien Miller62cee002000-09-23 17:15:56 +1100172 const char *host;
173 const char *service;
Damien Miller62cee002000-09-23 17:15:56 +1100174 Authmethod *method;
Damien Miller874d77b2000-10-14 16:23:11 +1100175 int success;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000176 char *authlist;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000177 /* pubkey */
Damien Miller280ecfb2003-05-14 13:46:00 +1000178 Idlist keys;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000179 AuthenticationConnection *agent;
180 /* hostbased */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000181 Sensitive *sensitive;
Ben Lindstrom7d199962001-09-12 18:29:00 +0000182 /* kbd-interactive */
183 int info_req_seen;
Darren Tucker0efd1552003-08-26 11:49:55 +1000184 /* generic */
185 void *methoddata;
Damien Miller62cee002000-09-23 17:15:56 +1100186};
187struct Authmethod {
188 char *name; /* string to compare against server's list */
189 int (*userauth)(Authctxt *authctxt);
190 int *enabled; /* flag in option struct that enables method */
191 int *batch_flag; /* flag in option struct that disables method */
192};
193
Damien Miller630d6f42002-01-22 23:17:30 +1100194void input_userauth_success(int, u_int32_t, void *);
195void input_userauth_failure(int, u_int32_t, void *);
196void input_userauth_banner(int, u_int32_t, void *);
197void input_userauth_error(int, u_int32_t, void *);
198void input_userauth_info_req(int, u_int32_t, void *);
199void input_userauth_pk_ok(int, u_int32_t, void *);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000200void input_userauth_passwd_changereq(int, u_int32_t, void *);
Damien Miller874d77b2000-10-14 16:23:11 +1100201
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000202int userauth_none(Authctxt *);
203int userauth_pubkey(Authctxt *);
204int userauth_passwd(Authctxt *);
205int userauth_kbdint(Authctxt *);
206int userauth_hostbased(Authctxt *);
Damien Miller3ab496b2003-05-14 13:47:37 +1000207int userauth_kerberos(Authctxt *);
Damien Miller62cee002000-09-23 17:15:56 +1100208
Darren Tucker0efd1552003-08-26 11:49:55 +1000209#ifdef GSSAPI
210int userauth_gssapi(Authctxt *authctxt);
211void input_gssapi_response(int type, u_int32_t, void *);
212void input_gssapi_token(int type, u_int32_t, void *);
213void input_gssapi_hash(int type, u_int32_t, void *);
214void input_gssapi_error(int, u_int32_t, void *);
215void input_gssapi_errtok(int, u_int32_t, void *);
216#endif
217
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000218void userauth(Authctxt *, char *);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000219
Damien Miller280ecfb2003-05-14 13:46:00 +1000220static int sign_and_send_pubkey(Authctxt *, Identity *);
Damien Miller280ecfb2003-05-14 13:46:00 +1000221static void pubkey_prepare(Authctxt *);
222static void pubkey_cleanup(Authctxt *);
223static Key *load_identity_file(char *);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000224
Ben Lindstrombba81212001-06-25 05:01:22 +0000225static Authmethod *authmethod_get(char *authlist);
226static Authmethod *authmethod_lookup(const char *name);
227static char *authmethods_get(void);
Damien Miller62cee002000-09-23 17:15:56 +1100228
229Authmethod authmethods[] = {
Darren Tucker0efd1552003-08-26 11:49:55 +1000230#ifdef GSSAPI
Damien Miller0425d402003-11-17 22:18:21 +1100231 {"gssapi-with-mic",
Darren Tucker0efd1552003-08-26 11:49:55 +1000232 userauth_gssapi,
233 &options.gss_authentication,
234 NULL},
235#endif
Ben Lindstrom1bfe2912001-06-05 19:37:25 +0000236 {"hostbased",
237 userauth_hostbased,
238 &options.hostbased_authentication,
239 NULL},
Ben Lindstrom45350e82001-08-06 20:57:11 +0000240 {"publickey",
241 userauth_pubkey,
242 &options.pubkey_authentication,
243 NULL},
Damien Miller874d77b2000-10-14 16:23:11 +1100244 {"keyboard-interactive",
245 userauth_kbdint,
246 &options.kbd_interactive_authentication,
247 &options.batch_mode},
Ben Lindstrom45350e82001-08-06 20:57:11 +0000248 {"password",
249 userauth_passwd,
250 &options.password_authentication,
251 &options.batch_mode},
Damien Miller874d77b2000-10-14 16:23:11 +1100252 {"none",
253 userauth_none,
254 NULL,
255 NULL},
Damien Miller62cee002000-09-23 17:15:56 +1100256 {NULL, NULL, NULL, NULL}
257};
258
259void
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000260ssh_userauth2(const char *local_user, const char *server_user, char *host,
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000261 Sensitive *sensitive)
Damien Miller62cee002000-09-23 17:15:56 +1100262{
263 Authctxt authctxt;
264 int type;
Damien Miller62cee002000-09-23 17:15:56 +1100265
Ben Lindstrom551ea372001-06-05 18:56:16 +0000266 if (options.challenge_response_authentication)
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +0000267 options.kbd_interactive_authentication = 1;
268
Damien Miller62cee002000-09-23 17:15:56 +1100269 packet_start(SSH2_MSG_SERVICE_REQUEST);
270 packet_put_cstring("ssh-userauth");
271 packet_send();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000272 debug("SSH2_MSG_SERVICE_REQUEST sent");
Damien Miller62cee002000-09-23 17:15:56 +1100273 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100274 type = packet_read();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000275 if (type != SSH2_MSG_SERVICE_ACCEPT)
276 fatal("Server denied authentication request: %d", type);
Damien Miller62cee002000-09-23 17:15:56 +1100277 if (packet_remaining() > 0) {
Damien Millerdff50992002-01-22 23:16:32 +1100278 char *reply = packet_get_string(NULL);
Ben Lindstrom064496f2002-12-23 02:04:22 +0000279 debug2("service_accept: %s", reply);
Damien Miller62cee002000-09-23 17:15:56 +1100280 xfree(reply);
Damien Miller62cee002000-09-23 17:15:56 +1100281 } else {
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000282 debug2("buggy server: service_accept w/o service");
Damien Miller62cee002000-09-23 17:15:56 +1100283 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100284 packet_check_eom();
Ben Lindstrom064496f2002-12-23 02:04:22 +0000285 debug("SSH2_MSG_SERVICE_ACCEPT received");
Damien Miller62cee002000-09-23 17:15:56 +1100286
Ben Lindstromb9be60a2001-03-11 01:49:19 +0000287 if (options.preferred_authentications == NULL)
288 options.preferred_authentications = authmethods_get();
289
Damien Miller62cee002000-09-23 17:15:56 +1100290 /* setup authentication context */
Ben Lindstrom7d199962001-09-12 18:29:00 +0000291 memset(&authctxt, 0, sizeof(authctxt));
Damien Miller280ecfb2003-05-14 13:46:00 +1000292 pubkey_prepare(&authctxt);
Damien Miller62cee002000-09-23 17:15:56 +1100293 authctxt.server_user = server_user;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000294 authctxt.local_user = local_user;
Damien Miller62cee002000-09-23 17:15:56 +1100295 authctxt.host = host;
296 authctxt.service = "ssh-connection"; /* service name */
297 authctxt.success = 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100298 authctxt.method = authmethod_lookup("none");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000299 authctxt.authlist = NULL;
Darren Tucker0efd1552003-08-26 11:49:55 +1000300 authctxt.methoddata = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000301 authctxt.sensitive = sensitive;
Ben Lindstrom7d199962001-09-12 18:29:00 +0000302 authctxt.info_req_seen = 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100303 if (authctxt.method == NULL)
304 fatal("ssh_userauth2: internal error: cannot send userauth none request");
Damien Miller62cee002000-09-23 17:15:56 +1100305
306 /* initial userauth request */
Damien Miller874d77b2000-10-14 16:23:11 +1100307 userauth_none(&authctxt);
Damien Miller62cee002000-09-23 17:15:56 +1100308
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000309 dispatch_init(&input_userauth_error);
Damien Miller62cee002000-09-23 17:15:56 +1100310 dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
311 dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000312 dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
Damien Miller62cee002000-09-23 17:15:56 +1100313 dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */
314
Damien Miller280ecfb2003-05-14 13:46:00 +1000315 pubkey_cleanup(&authctxt);
Damien Millerf842fcb2003-05-15 12:01:28 +1000316 dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
317
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000318 debug("Authentication succeeded (%s).", authctxt.method->name);
Damien Miller62cee002000-09-23 17:15:56 +1100319}
Damien Millerf842fcb2003-05-15 12:01:28 +1000320
Damien Miller62cee002000-09-23 17:15:56 +1100321void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000322userauth(Authctxt *authctxt, char *authlist)
323{
Darren Tucker0efd1552003-08-26 11:49:55 +1000324 if (authctxt->methoddata) {
325 xfree(authctxt->methoddata);
326 authctxt->methoddata = NULL;
327 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000328 if (authlist == NULL) {
329 authlist = authctxt->authlist;
330 } else {
331 if (authctxt->authlist)
332 xfree(authctxt->authlist);
333 authctxt->authlist = authlist;
334 }
335 for (;;) {
336 Authmethod *method = authmethod_get(authlist);
337 if (method == NULL)
338 fatal("Permission denied (%s).", authlist);
339 authctxt->method = method;
Damien Millerf842fcb2003-05-15 12:01:28 +1000340
341 /* reset the per method handler */
342 dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN,
343 SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
344
345 /* and try new method */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000346 if (method->userauth(authctxt) != 0) {
347 debug2("we sent a %s packet, wait for reply", method->name);
348 break;
349 } else {
350 debug2("we did not send a packet, disable method");
351 method->enabled = NULL;
352 }
353 }
354}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000355
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000356void
Damien Miller630d6f42002-01-22 23:17:30 +1100357input_userauth_error(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100358{
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000359 fatal("input_userauth_error: bad message during authentication: "
Damien Miller0dc1bef2005-07-17 17:22:45 +1000360 "type %d", type);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000361}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000362
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000363void
Damien Miller630d6f42002-01-22 23:17:30 +1100364input_userauth_banner(int type, u_int32_t seq, void *ctxt)
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000365{
366 char *msg, *lang;
Darren Tucker79644822003-10-08 17:37:58 +1000367
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000368 debug3("input_userauth_banner");
369 msg = packet_get_string(NULL);
370 lang = packet_get_string(NULL);
Darren Tucker046dff22003-10-08 17:32:02 +1000371 if (options.log_level > SYSLOG_LEVEL_QUIET)
372 fprintf(stderr, "%s", msg);
Ben Lindstromd26dcf32001-01-06 15:18:16 +0000373 xfree(msg);
374 xfree(lang);
Damien Miller62cee002000-09-23 17:15:56 +1100375}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000376
Damien Miller62cee002000-09-23 17:15:56 +1100377void
Damien Miller630d6f42002-01-22 23:17:30 +1100378input_userauth_success(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100379{
380 Authctxt *authctxt = ctxt;
381 if (authctxt == NULL)
382 fatal("input_userauth_success: no authentication context");
Darren Tucker79644822003-10-08 17:37:58 +1000383 if (authctxt->authlist) {
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000384 xfree(authctxt->authlist);
Darren Tucker79644822003-10-08 17:37:58 +1000385 authctxt->authlist = NULL;
386 }
387 if (authctxt->methoddata) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000388 xfree(authctxt->methoddata);
Darren Tucker79644822003-10-08 17:37:58 +1000389 authctxt->methoddata = NULL;
390 }
Damien Miller62cee002000-09-23 17:15:56 +1100391 authctxt->success = 1; /* break out */
392}
Ben Lindstrom5c385522002-06-23 21:23:20 +0000393
Damien Miller62cee002000-09-23 17:15:56 +1100394void
Damien Miller630d6f42002-01-22 23:17:30 +1100395input_userauth_failure(int type, u_int32_t seq, void *ctxt)
Damien Miller62cee002000-09-23 17:15:56 +1100396{
Damien Miller62cee002000-09-23 17:15:56 +1100397 Authctxt *authctxt = ctxt;
398 char *authlist = NULL;
399 int partial;
Damien Miller62cee002000-09-23 17:15:56 +1100400
401 if (authctxt == NULL)
402 fatal("input_userauth_failure: no authentication context");
403
Damien Miller874d77b2000-10-14 16:23:11 +1100404 authlist = packet_get_string(NULL);
Damien Miller62cee002000-09-23 17:15:56 +1100405 partial = packet_get_char();
Damien Miller48b03fc2002-01-22 23:11:40 +1100406 packet_check_eom();
Damien Miller62cee002000-09-23 17:15:56 +1100407
408 if (partial != 0)
Damien Miller996acd22003-04-09 20:59:48 +1000409 logit("Authenticated with partial success.");
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000410 debug("Authentications that can continue: %s", authlist);
Damien Miller62cee002000-09-23 17:15:56 +1100411
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000412 userauth(authctxt, authlist);
413}
414void
Damien Miller630d6f42002-01-22 23:17:30 +1100415input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000416{
417 Authctxt *authctxt = ctxt;
418 Key *key = NULL;
Damien Miller280ecfb2003-05-14 13:46:00 +1000419 Identity *id = NULL;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000420 Buffer b;
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000421 int pktype, sent = 0;
422 u_int alen, blen;
423 char *pkalg, *fp;
424 u_char *pkblob;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000425
426 if (authctxt == NULL)
427 fatal("input_userauth_pk_ok: no authentication context");
428 if (datafellows & SSH_BUG_PKOK) {
429 /* this is similar to SSH_BUG_PKAUTH */
430 debug2("input_userauth_pk_ok: SSH_BUG_PKOK");
431 pkblob = packet_get_string(&blen);
432 buffer_init(&b);
433 buffer_append(&b, pkblob, blen);
434 pkalg = buffer_get_string(&b, &alen);
435 buffer_free(&b);
436 } else {
437 pkalg = packet_get_string(&alen);
438 pkblob = packet_get_string(&blen);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000439 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100440 packet_check_eom();
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000441
Damien Miller280ecfb2003-05-14 13:46:00 +1000442 debug("Server accepts key: pkalg %s blen %u", pkalg, blen);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000443
Damien Miller280ecfb2003-05-14 13:46:00 +1000444 if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) {
445 debug("unknown pkalg %s", pkalg);
446 goto done;
447 }
448 if ((key = key_from_blob(pkblob, blen)) == NULL) {
449 debug("no key from blob. pkalg %s", pkalg);
450 goto done;
451 }
452 if (key->type != pktype) {
453 error("input_userauth_pk_ok: type mismatch "
454 "for decoded key (received %d, expected %d)",
455 key->type, pktype);
456 goto done;
457 }
458 fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
459 debug2("input_userauth_pk_ok: fp %s", fp);
460 xfree(fp);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000461
Darren Tuckerd05b6012003-10-15 15:55:59 +1000462 /*
463 * search keys in the reverse order, because last candidate has been
464 * moved to the end of the queue. this also avoids confusion by
465 * duplicate keys
466 */
Damien Miller0b51a522004-04-20 20:07:19 +1000467 TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
Damien Miller280ecfb2003-05-14 13:46:00 +1000468 if (key_equal(key, id->key)) {
469 sent = sign_and_send_pubkey(authctxt, id);
470 break;
471 }
472 }
473done:
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000474 if (key != NULL)
475 key_free(key);
476 xfree(pkalg);
477 xfree(pkblob);
478
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000479 /* try another method if we did not send a packet */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000480 if (sent == 0)
481 userauth(authctxt, NULL);
Damien Miller62cee002000-09-23 17:15:56 +1100482}
483
Darren Tucker0efd1552003-08-26 11:49:55 +1000484#ifdef GSSAPI
Damien Millera8e06ce2003-11-21 23:48:55 +1100485int
Darren Tucker0efd1552003-08-26 11:49:55 +1000486userauth_gssapi(Authctxt *authctxt)
487{
488 Gssctxt *gssctxt = NULL;
Darren Tucker56afe142003-11-03 20:06:14 +1100489 static gss_OID_set gss_supported = NULL;
Damien Millereccb9de2005-06-17 12:59:34 +1000490 static u_int mech = 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000491 OM_uint32 min;
492 int ok = 0;
493
494 /* Try one GSSAPI method at a time, rather than sending them all at
495 * once. */
496
Darren Tucker56afe142003-11-03 20:06:14 +1100497 if (gss_supported == NULL)
498 gss_indicate_mechs(&min, &gss_supported);
Darren Tucker0efd1552003-08-26 11:49:55 +1000499
500 /* Check to see if the mechanism is usable before we offer it */
Darren Tucker56afe142003-11-03 20:06:14 +1100501 while (mech < gss_supported->count && !ok) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000502 if (gssctxt)
503 ssh_gssapi_delete_ctx(&gssctxt);
504 ssh_gssapi_build_ctx(&gssctxt);
Darren Tucker56afe142003-11-03 20:06:14 +1100505 ssh_gssapi_set_oid(gssctxt, &gss_supported->elements[mech]);
Darren Tucker0efd1552003-08-26 11:49:55 +1000506
507 /* My DER encoding requires length<128 */
Darren Tucker56afe142003-11-03 20:06:14 +1100508 if (gss_supported->elements[mech].length < 128 &&
Darren Tucker0efd1552003-08-26 11:49:55 +1000509 !GSS_ERROR(ssh_gssapi_import_name(gssctxt,
510 authctxt->host))) {
511 ok = 1; /* Mechanism works */
512 } else {
513 mech++;
514 }
515 }
516
Damien Millereccb9de2005-06-17 12:59:34 +1000517 if (!ok)
518 return 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000519
520 authctxt->methoddata=(void *)gssctxt;
521
522 packet_start(SSH2_MSG_USERAUTH_REQUEST);
523 packet_put_cstring(authctxt->server_user);
524 packet_put_cstring(authctxt->service);
525 packet_put_cstring(authctxt->method->name);
526
527 packet_put_int(1);
528
Darren Tucker655a5e02003-11-03 20:09:03 +1100529 packet_put_int((gss_supported->elements[mech].length) + 2);
530 packet_put_char(SSH_GSS_OIDTYPE);
531 packet_put_char(gss_supported->elements[mech].length);
532 packet_put_raw(gss_supported->elements[mech].elements,
533 gss_supported->elements[mech].length);
Darren Tucker0efd1552003-08-26 11:49:55 +1000534
535 packet_send();
536
537 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
538 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
539 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
540 dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
541
542 mech++; /* Move along to next candidate */
543
544 return 1;
545}
546
Damien Miller91c6aa42003-11-17 21:20:18 +1100547static OM_uint32
548process_gssapi_token(void *ctxt, gss_buffer_t recv_tok)
549{
550 Authctxt *authctxt = ctxt;
551 Gssctxt *gssctxt = authctxt->methoddata;
552 gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
Damien Millerda9984f2005-08-31 19:46:26 +1000553 gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
554 gss_buffer_desc gssbuf;
Damien Miller0425d402003-11-17 22:18:21 +1100555 OM_uint32 status, ms, flags;
556 Buffer b;
Damien Miller787b2ec2003-11-21 23:56:47 +1100557
Damien Miller91c6aa42003-11-17 21:20:18 +1100558 status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
Damien Miller0425d402003-11-17 22:18:21 +1100559 recv_tok, &send_tok, &flags);
Damien Miller91c6aa42003-11-17 21:20:18 +1100560
561 if (send_tok.length > 0) {
562 if (GSS_ERROR(status))
563 packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
564 else
565 packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
Damien Miller787b2ec2003-11-21 23:56:47 +1100566
Damien Miller91c6aa42003-11-17 21:20:18 +1100567 packet_put_string(send_tok.value, send_tok.length);
568 packet_send();
569 gss_release_buffer(&ms, &send_tok);
570 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100571
Damien Miller91c6aa42003-11-17 21:20:18 +1100572 if (status == GSS_S_COMPLETE) {
Damien Miller0425d402003-11-17 22:18:21 +1100573 /* send either complete or MIC, depending on mechanism */
574 if (!(flags & GSS_C_INTEG_FLAG)) {
575 packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
576 packet_send();
577 } else {
578 ssh_gssapi_buildmic(&b, authctxt->server_user,
579 authctxt->service, "gssapi-with-mic");
580
581 gssbuf.value = buffer_ptr(&b);
582 gssbuf.length = buffer_len(&b);
Damien Miller787b2ec2003-11-21 23:56:47 +1100583
Damien Miller0425d402003-11-17 22:18:21 +1100584 status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +1100585
Damien Miller0425d402003-11-17 22:18:21 +1100586 if (!GSS_ERROR(status)) {
587 packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC);
588 packet_put_string(mic.value, mic.length);
Damien Miller787b2ec2003-11-21 23:56:47 +1100589
Damien Miller0425d402003-11-17 22:18:21 +1100590 packet_send();
591 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100592
Damien Miller0425d402003-11-17 22:18:21 +1100593 buffer_free(&b);
594 gss_release_buffer(&ms, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +1100595 }
Damien Miller91c6aa42003-11-17 21:20:18 +1100596 }
Damien Miller787b2ec2003-11-21 23:56:47 +1100597
Damien Miller91c6aa42003-11-17 21:20:18 +1100598 return status;
599}
600
Darren Tucker0efd1552003-08-26 11:49:55 +1000601void
602input_gssapi_response(int type, u_int32_t plen, void *ctxt)
603{
604 Authctxt *authctxt = ctxt;
605 Gssctxt *gssctxt;
Darren Tucker0efd1552003-08-26 11:49:55 +1000606 int oidlen;
607 char *oidv;
Darren Tucker0efd1552003-08-26 11:49:55 +1000608
609 if (authctxt == NULL)
610 fatal("input_gssapi_response: no authentication context");
611 gssctxt = authctxt->methoddata;
612
613 /* Setup our OID */
614 oidv = packet_get_string(&oidlen);
615
Darren Tucker655a5e02003-11-03 20:09:03 +1100616 if (oidlen <= 2 ||
617 oidv[0] != SSH_GSS_OIDTYPE ||
618 oidv[1] != oidlen - 2) {
Damien Miller91c6aa42003-11-17 21:20:18 +1100619 xfree(oidv);
Darren Tucker655a5e02003-11-03 20:09:03 +1100620 debug("Badly encoded mechanism OID received");
621 userauth(authctxt, NULL);
Darren Tucker655a5e02003-11-03 20:09:03 +1100622 return;
Darren Tucker0efd1552003-08-26 11:49:55 +1000623 }
624
Darren Tucker655a5e02003-11-03 20:09:03 +1100625 if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
626 fatal("Server returned different OID than expected");
627
Darren Tucker0efd1552003-08-26 11:49:55 +1000628 packet_check_eom();
629
630 xfree(oidv);
631
Damien Miller91c6aa42003-11-17 21:20:18 +1100632 if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000633 /* Start again with next method on list */
634 debug("Trying to start again");
635 userauth(authctxt, NULL);
636 return;
637 }
Darren Tucker0efd1552003-08-26 11:49:55 +1000638}
639
640void
641input_gssapi_token(int type, u_int32_t plen, void *ctxt)
642{
643 Authctxt *authctxt = ctxt;
Darren Tucker0efd1552003-08-26 11:49:55 +1000644 gss_buffer_desc recv_tok;
Damien Miller91c6aa42003-11-17 21:20:18 +1100645 OM_uint32 status;
Darren Tucker0efd1552003-08-26 11:49:55 +1000646 u_int slen;
647
648 if (authctxt == NULL)
649 fatal("input_gssapi_response: no authentication context");
Darren Tucker0efd1552003-08-26 11:49:55 +1000650
651 recv_tok.value = packet_get_string(&slen);
652 recv_tok.length = slen; /* safe typecast */
653
654 packet_check_eom();
655
Damien Miller91c6aa42003-11-17 21:20:18 +1100656 status = process_gssapi_token(ctxt, &recv_tok);
Darren Tucker0efd1552003-08-26 11:49:55 +1000657
658 xfree(recv_tok.value);
659
660 if (GSS_ERROR(status)) {
Darren Tucker0efd1552003-08-26 11:49:55 +1000661 /* Start again with the next method in the list */
662 userauth(authctxt, NULL);
663 return;
664 }
Darren Tucker0efd1552003-08-26 11:49:55 +1000665}
666
667void
668input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
669{
670 Authctxt *authctxt = ctxt;
671 Gssctxt *gssctxt;
672 gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
673 gss_buffer_desc recv_tok;
674 OM_uint32 status, ms;
Darren Tucker600ad8d2003-08-26 12:10:48 +1000675 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +1000676
677 if (authctxt == NULL)
678 fatal("input_gssapi_response: no authentication context");
679 gssctxt = authctxt->methoddata;
680
Darren Tucker600ad8d2003-08-26 12:10:48 +1000681 recv_tok.value = packet_get_string(&len);
682 recv_tok.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +1000683
684 packet_check_eom();
685
686 /* Stick it into GSSAPI and see what it says */
687 status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
Damien Miller0dc1bef2005-07-17 17:22:45 +1000688 &recv_tok, &send_tok, NULL);
Darren Tucker0efd1552003-08-26 11:49:55 +1000689
690 xfree(recv_tok.value);
691 gss_release_buffer(&ms, &send_tok);
692
693 /* Server will be returning a failed packet after this one */
694}
695
696void
697input_gssapi_error(int type, u_int32_t plen, void *ctxt)
698{
699 OM_uint32 maj, min;
700 char *msg;
701 char *lang;
702
703 maj=packet_get_int();
704 min=packet_get_int();
705 msg=packet_get_string(NULL);
706 lang=packet_get_string(NULL);
707
708 packet_check_eom();
709
Damien Miller15d72a02005-11-05 15:07:33 +1100710 debug("Server GSSAPI Error:\n%s", msg);
Darren Tucker0efd1552003-08-26 11:49:55 +1000711 xfree(msg);
712 xfree(lang);
713}
714#endif /* GSSAPI */
715
Damien Millereba71ba2000-04-29 23:57:08 +1000716int
Damien Miller874d77b2000-10-14 16:23:11 +1100717userauth_none(Authctxt *authctxt)
718{
719 /* initial userauth request */
720 packet_start(SSH2_MSG_USERAUTH_REQUEST);
721 packet_put_cstring(authctxt->server_user);
722 packet_put_cstring(authctxt->service);
723 packet_put_cstring(authctxt->method->name);
724 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +1100725 return 1;
726}
727
728int
Damien Miller62cee002000-09-23 17:15:56 +1100729userauth_passwd(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +1000730{
Damien Millere247cc42000-05-07 12:03:14 +1000731 static int attempt = 0;
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000732 char prompt[150];
Damien Millereba71ba2000-04-29 23:57:08 +1000733 char *password;
734
Damien Millerd3a18572000-06-07 19:55:44 +1000735 if (attempt++ >= options.number_of_password_prompts)
Damien Millere247cc42000-05-07 12:03:14 +1000736 return 0;
737
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000738 if (attempt != 1)
Damien Millerd3a18572000-06-07 19:55:44 +1000739 error("Permission denied, please try again.");
740
Ben Lindstrom03df5bd2001-02-10 22:16:41 +0000741 snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
Damien Miller62cee002000-09-23 17:15:56 +1100742 authctxt->server_user, authctxt->host);
Damien Millereba71ba2000-04-29 23:57:08 +1000743 password = read_passphrase(prompt, 0);
744 packet_start(SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100745 packet_put_cstring(authctxt->server_user);
746 packet_put_cstring(authctxt->service);
Damien Miller874d77b2000-10-14 16:23:11 +1100747 packet_put_cstring(authctxt->method->name);
Damien Millereba71ba2000-04-29 23:57:08 +1000748 packet_put_char(0);
Ben Lindstrom5699c5f2001-03-05 06:17:49 +0000749 packet_put_cstring(password);
Damien Millereba71ba2000-04-29 23:57:08 +1000750 memset(password, 0, strlen(password));
751 xfree(password);
Damien Miller9f643902001-11-12 11:02:52 +1100752 packet_add_padding(64);
Damien Millereba71ba2000-04-29 23:57:08 +1000753 packet_send();
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000754
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000755 dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000756 &input_userauth_passwd_changereq);
757
Damien Millereba71ba2000-04-29 23:57:08 +1000758 return 1;
759}
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000760/*
761 * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
762 */
763void
Tim Ricec8549622002-03-31 12:49:38 -0800764input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000765{
766 Authctxt *authctxt = ctxt;
767 char *info, *lang, *password = NULL, *retype = NULL;
768 char prompt[150];
769
770 debug2("input_userauth_passwd_changereq");
771
772 if (authctxt == NULL)
773 fatal("input_userauth_passwd_changereq: "
774 "no authentication context");
775
776 info = packet_get_string(NULL);
777 lang = packet_get_string(NULL);
778 if (strlen(info) > 0)
Damien Miller996acd22003-04-09 20:59:48 +1000779 logit("%s", info);
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000780 xfree(info);
781 xfree(lang);
782 packet_start(SSH2_MSG_USERAUTH_REQUEST);
783 packet_put_cstring(authctxt->server_user);
784 packet_put_cstring(authctxt->service);
785 packet_put_cstring(authctxt->method->name);
786 packet_put_char(1); /* additional info */
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000787 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000788 "Enter %.30s@%.128s's old password: ",
789 authctxt->server_user, authctxt->host);
790 password = read_passphrase(prompt, 0);
791 packet_put_cstring(password);
792 memset(password, 0, strlen(password));
793 xfree(password);
794 password = NULL;
795 while (password == NULL) {
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000796 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000797 "Enter %.30s@%.128s's new password: ",
798 authctxt->server_user, authctxt->host);
799 password = read_passphrase(prompt, RP_ALLOW_EOF);
800 if (password == NULL) {
801 /* bail out */
802 return;
803 }
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000804 snprintf(prompt, sizeof(prompt),
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000805 "Retype %.30s@%.128s's new password: ",
806 authctxt->server_user, authctxt->host);
807 retype = read_passphrase(prompt, 0);
808 if (strcmp(password, retype) != 0) {
809 memset(password, 0, strlen(password));
810 xfree(password);
Damien Miller996acd22003-04-09 20:59:48 +1000811 logit("Mismatch; try again, EOF to quit.");
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000812 password = NULL;
813 }
814 memset(retype, 0, strlen(retype));
815 xfree(retype);
816 }
817 packet_put_cstring(password);
818 memset(password, 0, strlen(password));
819 xfree(password);
820 packet_add_padding(64);
821 packet_send();
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000822
823 dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
Ben Lindstrom38a69e62002-03-27 17:28:46 +0000824 &input_userauth_passwd_changereq);
825}
Damien Millereba71ba2000-04-29 23:57:08 +1000826
Ben Lindstrombba81212001-06-25 05:01:22 +0000827static int
Damien Miller280ecfb2003-05-14 13:46:00 +1000828identity_sign(Identity *id, u_char **sigp, u_int *lenp,
829 u_char *data, u_int datalen)
830{
831 Key *prv;
832 int ret;
833
834 /* the agent supports this key */
835 if (id->ac)
836 return (ssh_agent_sign(id->ac, id->key, sigp, lenp,
837 data, datalen));
838 /*
839 * we have already loaded the private key or
840 * the private key is stored in external hardware
841 */
842 if (id->isprivate || (id->key->flags & KEY_FLAG_EXT))
843 return (key_sign(id->key, sigp, lenp, data, datalen));
844 /* load the private key from the file */
845 if ((prv = load_identity_file(id->filename)) == NULL)
846 return (-1);
847 ret = key_sign(prv, sigp, lenp, data, datalen);
848 key_free(prv);
849 return (ret);
850}
851
852static int
853sign_and_send_pubkey(Authctxt *authctxt, Identity *id)
Damien Millereba71ba2000-04-29 23:57:08 +1000854{
855 Buffer b;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000856 u_char *blob, *signature;
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000857 u_int bloblen, slen;
Darren Tucker502d3842003-06-28 12:38:01 +1000858 u_int skip = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000859 int ret = -1;
Damien Miller874d77b2000-10-14 16:23:11 +1100860 int have_sig = 1;
Damien Millereba71ba2000-04-29 23:57:08 +1000861
Ben Lindstromd121f612000-12-03 17:00:47 +0000862 debug3("sign_and_send_pubkey");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000863
Damien Miller280ecfb2003-05-14 13:46:00 +1000864 if (key_to_blob(id->key, &blob, &bloblen) == 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100865 /* we cannot handle this key */
Ben Lindstromd121f612000-12-03 17:00:47 +0000866 debug3("sign_and_send_pubkey: cannot handle key");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100867 return 0;
868 }
Damien Millereba71ba2000-04-29 23:57:08 +1000869 /* data to be signed */
870 buffer_init(&b);
Damien Miller50a41ed2000-10-16 12:14:42 +1100871 if (datafellows & SSH_OLD_SESSIONID) {
Damien Miller6536c7d2000-06-22 21:32:31 +1000872 buffer_append(&b, session_id2, session_id2_len);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000873 skip = session_id2_len;
Damien Miller50a41ed2000-10-16 12:14:42 +1100874 } else {
875 buffer_put_string(&b, session_id2, session_id2_len);
876 skip = buffer_len(&b);
Damien Miller6536c7d2000-06-22 21:32:31 +1000877 }
Damien Millereba71ba2000-04-29 23:57:08 +1000878 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100879 buffer_put_cstring(&b, authctxt->server_user);
Damien Miller30c3d422000-05-09 11:02:59 +1000880 buffer_put_cstring(&b,
Ben Lindstromd121f612000-12-03 17:00:47 +0000881 datafellows & SSH_BUG_PKSERVICE ?
Damien Miller30c3d422000-05-09 11:02:59 +1000882 "ssh-userauth" :
Damien Miller62cee002000-09-23 17:15:56 +1100883 authctxt->service);
Ben Lindstromd121f612000-12-03 17:00:47 +0000884 if (datafellows & SSH_BUG_PKAUTH) {
885 buffer_put_char(&b, have_sig);
886 } else {
887 buffer_put_cstring(&b, authctxt->method->name);
888 buffer_put_char(&b, have_sig);
Damien Miller280ecfb2003-05-14 13:46:00 +1000889 buffer_put_cstring(&b, key_ssh_name(id->key));
Ben Lindstromd121f612000-12-03 17:00:47 +0000890 }
Damien Millereba71ba2000-04-29 23:57:08 +1000891 buffer_put_string(&b, blob, bloblen);
Damien Millereba71ba2000-04-29 23:57:08 +1000892
893 /* generate signature */
Damien Miller280ecfb2003-05-14 13:46:00 +1000894 ret = identity_sign(id, &signature, &slen,
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000895 buffer_ptr(&b), buffer_len(&b));
Damien Millerad833b32000-08-23 10:46:23 +1000896 if (ret == -1) {
897 xfree(blob);
898 buffer_free(&b);
899 return 0;
900 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100901#ifdef DEBUG_PK
Damien Millereba71ba2000-04-29 23:57:08 +1000902 buffer_dump(&b);
903#endif
Ben Lindstromd121f612000-12-03 17:00:47 +0000904 if (datafellows & SSH_BUG_PKSERVICE) {
Damien Miller30c3d422000-05-09 11:02:59 +1000905 buffer_clear(&b);
906 buffer_append(&b, session_id2, session_id2_len);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000907 skip = session_id2_len;
Damien Miller30c3d422000-05-09 11:02:59 +1000908 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
Damien Miller62cee002000-09-23 17:15:56 +1100909 buffer_put_cstring(&b, authctxt->server_user);
910 buffer_put_cstring(&b, authctxt->service);
Damien Miller874d77b2000-10-14 16:23:11 +1100911 buffer_put_cstring(&b, authctxt->method->name);
912 buffer_put_char(&b, have_sig);
Ben Lindstromd121f612000-12-03 17:00:47 +0000913 if (!(datafellows & SSH_BUG_PKAUTH))
Damien Miller280ecfb2003-05-14 13:46:00 +1000914 buffer_put_cstring(&b, key_ssh_name(id->key));
Damien Miller30c3d422000-05-09 11:02:59 +1000915 buffer_put_string(&b, blob, bloblen);
916 }
917 xfree(blob);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000918
Damien Millereba71ba2000-04-29 23:57:08 +1000919 /* append signature */
920 buffer_put_string(&b, signature, slen);
921 xfree(signature);
922
923 /* skip session id and packet type */
Damien Miller6536c7d2000-06-22 21:32:31 +1000924 if (buffer_len(&b) < skip + 1)
Damien Miller62cee002000-09-23 17:15:56 +1100925 fatal("userauth_pubkey: internal error");
Damien Miller6536c7d2000-06-22 21:32:31 +1000926 buffer_consume(&b, skip + 1);
Damien Millereba71ba2000-04-29 23:57:08 +1000927
928 /* put remaining data from buffer into packet */
929 packet_start(SSH2_MSG_USERAUTH_REQUEST);
930 packet_put_raw(buffer_ptr(&b), buffer_len(&b));
931 buffer_free(&b);
Damien Millereba71ba2000-04-29 23:57:08 +1000932 packet_send();
Damien Millerad833b32000-08-23 10:46:23 +1000933
934 return 1;
Damien Miller994cf142000-07-21 10:19:44 +1000935}
936
Ben Lindstrombba81212001-06-25 05:01:22 +0000937static int
Damien Miller280ecfb2003-05-14 13:46:00 +1000938send_pubkey_test(Authctxt *authctxt, Identity *id)
Damien Miller994cf142000-07-21 10:19:44 +1000939{
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000940 u_char *blob;
Ben Lindstromc58ab022002-02-26 18:15:09 +0000941 u_int bloblen, have_sig = 0;
Damien Miller994cf142000-07-21 10:19:44 +1000942
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000943 debug3("send_pubkey_test");
944
Damien Miller280ecfb2003-05-14 13:46:00 +1000945 if (key_to_blob(id->key, &blob, &bloblen) == 0) {
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000946 /* we cannot handle this key */
947 debug3("send_pubkey_test: cannot handle key");
Damien Miller994cf142000-07-21 10:19:44 +1000948 return 0;
949 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000950 /* register callback for USERAUTH_PK_OK message */
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000951 dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
Damien Miller994cf142000-07-21 10:19:44 +1000952
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000953 packet_start(SSH2_MSG_USERAUTH_REQUEST);
954 packet_put_cstring(authctxt->server_user);
955 packet_put_cstring(authctxt->service);
956 packet_put_cstring(authctxt->method->name);
957 packet_put_char(have_sig);
958 if (!(datafellows & SSH_BUG_PKAUTH))
Damien Miller280ecfb2003-05-14 13:46:00 +1000959 packet_put_cstring(key_ssh_name(id->key));
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000960 packet_put_string(blob, bloblen);
961 xfree(blob);
962 packet_send();
963 return 1;
964}
965
Ben Lindstrombba81212001-06-25 05:01:22 +0000966static Key *
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000967load_identity_file(char *filename)
968{
969 Key *private;
970 char prompt[300], *passphrase;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000971 int quit, i;
Ben Lindstrom329782e2001-03-10 17:08:59 +0000972 struct stat st;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000973
Ben Lindstrom329782e2001-03-10 17:08:59 +0000974 if (stat(filename, &st) < 0) {
975 debug3("no such identity: %s", filename);
976 return NULL;
977 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000978 private = key_load_private_type(KEY_UNSPEC, filename, "", NULL);
979 if (private == NULL) {
980 if (options.batch_mode)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000981 return NULL;
Damien Miller994cf142000-07-21 10:19:44 +1000982 snprintf(prompt, sizeof prompt,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100983 "Enter passphrase for key '%.100s': ", filename);
Damien Miller62cee002000-09-23 17:15:56 +1100984 for (i = 0; i < options.number_of_password_prompts; i++) {
985 passphrase = read_passphrase(prompt, 0);
986 if (strcmp(passphrase, "") != 0) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000987 private = key_load_private_type(KEY_UNSPEC, filename,
988 passphrase, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000989 quit = 0;
Damien Miller62cee002000-09-23 17:15:56 +1100990 } else {
991 debug2("no passphrase given, try next key");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000992 quit = 1;
Damien Miller62cee002000-09-23 17:15:56 +1100993 }
994 memset(passphrase, 0, strlen(passphrase));
995 xfree(passphrase);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000996 if (private != NULL || quit)
Damien Miller62cee002000-09-23 17:15:56 +1100997 break;
998 debug2("bad passphrase given, try again...");
999 }
Damien Miller994cf142000-07-21 10:19:44 +10001000 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001001 return private;
1002}
1003
Damien Miller280ecfb2003-05-14 13:46:00 +10001004/*
1005 * try keys in the following order:
1006 * 1. agent keys that are found in the config file
1007 * 2. other agent keys
1008 * 3. keys that are only listed in the config file
1009 */
1010static void
1011pubkey_prepare(Authctxt *authctxt)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001012{
Damien Miller280ecfb2003-05-14 13:46:00 +10001013 Identity *id;
1014 Idlist agent, files, *preferred;
1015 Key *key;
1016 AuthenticationConnection *ac;
Damien Millerad833b32000-08-23 10:46:23 +10001017 char *comment;
Damien Miller280ecfb2003-05-14 13:46:00 +10001018 int i, found;
Damien Millerad833b32000-08-23 10:46:23 +10001019
Damien Miller280ecfb2003-05-14 13:46:00 +10001020 TAILQ_INIT(&agent); /* keys from the agent */
1021 TAILQ_INIT(&files); /* keys from the config file */
1022 preferred = &authctxt->keys;
1023 TAILQ_INIT(preferred); /* preferred order of keys */
1024
1025 /* list of keys stored in the filesystem */
1026 for (i = 0; i < options.num_identity_files; i++) {
1027 key = options.identity_keys[i];
1028 if (key && key->type == KEY_RSA1)
1029 continue;
1030 options.identity_keys[i] = NULL;
1031 id = xmalloc(sizeof(*id));
1032 memset(id, 0, sizeof(*id));
1033 id->key = key;
1034 id->filename = xstrdup(options.identity_files[i]);
1035 TAILQ_INSERT_TAIL(&files, id, next);
Damien Millerad833b32000-08-23 10:46:23 +10001036 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001037 /* list of keys supported by the agent */
1038 if ((ac = ssh_get_authentication_connection())) {
1039 for (key = ssh_get_first_identity(ac, &comment, 2);
1040 key != NULL;
1041 key = ssh_get_next_identity(ac, &comment, 2)) {
1042 found = 0;
1043 TAILQ_FOREACH(id, &files, next) {
Damien Millera8e06ce2003-11-21 23:48:55 +11001044 /* agent keys from the config file are preferred */
Damien Miller280ecfb2003-05-14 13:46:00 +10001045 if (key_equal(key, id->key)) {
1046 key_free(key);
1047 xfree(comment);
1048 TAILQ_REMOVE(&files, id, next);
1049 TAILQ_INSERT_TAIL(preferred, id, next);
1050 id->ac = ac;
1051 found = 1;
1052 break;
1053 }
1054 }
Damien Millerbd394c32004-03-08 23:12:36 +11001055 if (!found && !options.identities_only) {
Damien Miller280ecfb2003-05-14 13:46:00 +10001056 id = xmalloc(sizeof(*id));
1057 memset(id, 0, sizeof(*id));
1058 id->key = key;
1059 id->filename = comment;
1060 id->ac = ac;
1061 TAILQ_INSERT_TAIL(&agent, id, next);
1062 }
1063 }
1064 /* append remaining agent keys */
1065 for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1066 TAILQ_REMOVE(&agent, id, next);
1067 TAILQ_INSERT_TAIL(preferred, id, next);
1068 }
1069 authctxt->agent = ac;
Damien Miller62cee002000-09-23 17:15:56 +11001070 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001071 /* append remaining keys from the config file */
1072 for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1073 TAILQ_REMOVE(&files, id, next);
1074 TAILQ_INSERT_TAIL(preferred, id, next);
1075 }
1076 TAILQ_FOREACH(id, preferred, next) {
1077 debug2("key: %s (%p)", id->filename, id->key);
1078 }
1079}
1080
1081static void
1082pubkey_cleanup(Authctxt *authctxt)
1083{
1084 Identity *id;
1085
1086 if (authctxt->agent != NULL)
1087 ssh_close_authentication_connection(authctxt->agent);
1088 for (id = TAILQ_FIRST(&authctxt->keys); id;
1089 id = TAILQ_FIRST(&authctxt->keys)) {
1090 TAILQ_REMOVE(&authctxt->keys, id, next);
1091 if (id->key)
1092 key_free(id->key);
1093 if (id->filename)
1094 xfree(id->filename);
1095 xfree(id);
1096 }
Damien Millereba71ba2000-04-29 23:57:08 +10001097}
1098
Damien Miller62cee002000-09-23 17:15:56 +11001099int
1100userauth_pubkey(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +10001101{
Damien Miller280ecfb2003-05-14 13:46:00 +10001102 Identity *id;
Damien Miller62cee002000-09-23 17:15:56 +11001103 int sent = 0;
Damien Millereba71ba2000-04-29 23:57:08 +10001104
Damien Miller280ecfb2003-05-14 13:46:00 +10001105 while ((id = TAILQ_FIRST(&authctxt->keys))) {
1106 if (id->tried++)
1107 return (0);
Darren Tuckerd05b6012003-10-15 15:55:59 +10001108 /* move key to the end of the queue */
Damien Miller280ecfb2003-05-14 13:46:00 +10001109 TAILQ_REMOVE(&authctxt->keys, id, next);
1110 TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1111 /*
1112 * send a test message if we have the public key. for
1113 * encrypted keys we cannot do this and have to load the
1114 * private key instead
1115 */
1116 if (id->key && id->key->type != KEY_RSA1) {
1117 debug("Offering public key: %s", id->filename);
1118 sent = send_pubkey_test(authctxt, id);
1119 } else if (id->key == NULL) {
1120 debug("Trying private key: %s", id->filename);
1121 id->key = load_identity_file(id->filename);
1122 if (id->key != NULL) {
1123 id->isprivate = 1;
1124 sent = sign_and_send_pubkey(authctxt, id);
1125 key_free(id->key);
1126 id->key = NULL;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001127 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001128 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001129 if (sent)
1130 return (sent);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001131 }
Damien Miller280ecfb2003-05-14 13:46:00 +10001132 return (0);
Damien Miller62cee002000-09-23 17:15:56 +11001133}
Damien Millereba71ba2000-04-29 23:57:08 +10001134
Damien Miller874d77b2000-10-14 16:23:11 +11001135/*
1136 * Send userauth request message specifying keyboard-interactive method.
1137 */
1138int
1139userauth_kbdint(Authctxt *authctxt)
1140{
1141 static int attempt = 0;
1142
1143 if (attempt++ >= options.number_of_password_prompts)
1144 return 0;
Ben Lindstrom7d199962001-09-12 18:29:00 +00001145 /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1146 if (attempt > 1 && !authctxt->info_req_seen) {
1147 debug3("userauth_kbdint: disable: no info_req_seen");
1148 dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1149 return 0;
1150 }
Damien Miller874d77b2000-10-14 16:23:11 +11001151
1152 debug2("userauth_kbdint");
1153 packet_start(SSH2_MSG_USERAUTH_REQUEST);
1154 packet_put_cstring(authctxt->server_user);
1155 packet_put_cstring(authctxt->service);
1156 packet_put_cstring(authctxt->method->name);
1157 packet_put_cstring(""); /* lang */
1158 packet_put_cstring(options.kbd_interactive_devices ?
1159 options.kbd_interactive_devices : "");
1160 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +11001161
1162 dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1163 return 1;
1164}
1165
1166/*
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001167 * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
Damien Miller874d77b2000-10-14 16:23:11 +11001168 */
1169void
Damien Miller630d6f42002-01-22 23:17:30 +11001170input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
Damien Miller874d77b2000-10-14 16:23:11 +11001171{
1172 Authctxt *authctxt = ctxt;
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001173 char *name, *inst, *lang, *prompt, *response;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001174 u_int num_prompts, i;
Damien Miller874d77b2000-10-14 16:23:11 +11001175 int echo = 0;
1176
1177 debug2("input_userauth_info_req");
1178
1179 if (authctxt == NULL)
1180 fatal("input_userauth_info_req: no authentication context");
1181
Ben Lindstrom7d199962001-09-12 18:29:00 +00001182 authctxt->info_req_seen = 1;
1183
Damien Miller874d77b2000-10-14 16:23:11 +11001184 name = packet_get_string(NULL);
1185 inst = packet_get_string(NULL);
1186 lang = packet_get_string(NULL);
Damien Miller874d77b2000-10-14 16:23:11 +11001187 if (strlen(name) > 0)
Damien Miller996acd22003-04-09 20:59:48 +10001188 logit("%s", name);
Damien Miller874d77b2000-10-14 16:23:11 +11001189 if (strlen(inst) > 0)
Damien Miller996acd22003-04-09 20:59:48 +10001190 logit("%s", inst);
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001191 xfree(name);
Damien Miller874d77b2000-10-14 16:23:11 +11001192 xfree(inst);
Ben Lindstrom03df5bd2001-02-10 22:16:41 +00001193 xfree(lang);
Damien Miller874d77b2000-10-14 16:23:11 +11001194
1195 num_prompts = packet_get_int();
1196 /*
1197 * Begin to build info response packet based on prompts requested.
1198 * We commit to providing the correct number of responses, so if
1199 * further on we run into a problem that prevents this, we have to
1200 * be sure and clean this up and send a correct error response.
1201 */
1202 packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
1203 packet_put_int(num_prompts);
1204
Ben Lindstrom551ea372001-06-05 18:56:16 +00001205 debug2("input_userauth_info_req: num_prompts %d", num_prompts);
Damien Miller874d77b2000-10-14 16:23:11 +11001206 for (i = 0; i < num_prompts; i++) {
1207 prompt = packet_get_string(NULL);
1208 echo = packet_get_char();
1209
Ben Lindstrom949974b2001-06-25 05:20:31 +00001210 response = read_passphrase(prompt, echo ? RP_ECHO : 0);
Damien Miller874d77b2000-10-14 16:23:11 +11001211
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001212 packet_put_cstring(response);
Damien Miller874d77b2000-10-14 16:23:11 +11001213 memset(response, 0, strlen(response));
1214 xfree(response);
1215 xfree(prompt);
1216 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001217 packet_check_eom(); /* done with parsing incoming message. */
Damien Miller874d77b2000-10-14 16:23:11 +11001218
Damien Miller9f643902001-11-12 11:02:52 +11001219 packet_add_padding(64);
Damien Miller874d77b2000-10-14 16:23:11 +11001220 packet_send();
Damien Miller874d77b2000-10-14 16:23:11 +11001221}
Damien Miller62cee002000-09-23 17:15:56 +11001222
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001223static int
Ben Lindstrom5c385522002-06-23 21:23:20 +00001224ssh_keysign(Key *key, u_char **sigp, u_int *lenp,
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001225 u_char *data, u_int datalen)
1226{
1227 Buffer b;
Ben Lindstrom5206b952002-06-06 19:59:29 +00001228 struct stat st;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001229 pid_t pid;
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001230 int to[2], from[2], status, version = 2;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001231
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001232 debug2("ssh_keysign called");
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001233
Ben Lindstrom5206b952002-06-06 19:59:29 +00001234 if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1235 error("ssh_keysign: no installed: %s", strerror(errno));
1236 return -1;
1237 }
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001238 if (fflush(stdout) != 0)
1239 error("ssh_keysign: fflush: %s", strerror(errno));
1240 if (pipe(to) < 0) {
1241 error("ssh_keysign: pipe: %s", strerror(errno));
1242 return -1;
1243 }
1244 if (pipe(from) < 0) {
1245 error("ssh_keysign: pipe: %s", strerror(errno));
1246 return -1;
1247 }
1248 if ((pid = fork()) < 0) {
1249 error("ssh_keysign: fork: %s", strerror(errno));
1250 return -1;
1251 }
1252 if (pid == 0) {
1253 seteuid(getuid());
1254 setuid(getuid());
1255 close(from[0]);
1256 if (dup2(from[1], STDOUT_FILENO) < 0)
1257 fatal("ssh_keysign: dup2: %s", strerror(errno));
1258 close(to[1]);
1259 if (dup2(to[0], STDIN_FILENO) < 0)
1260 fatal("ssh_keysign: dup2: %s", strerror(errno));
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001261 close(from[1]);
1262 close(to[0]);
Ben Lindstrom4887da22002-06-06 20:05:57 +00001263 execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001264 fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN,
1265 strerror(errno));
1266 }
1267 close(from[1]);
1268 close(to[0]);
1269
1270 buffer_init(&b);
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001271 buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001272 buffer_put_string(&b, data, datalen);
Damien Miller51bf11f2003-11-17 21:20:47 +11001273 if (ssh_msg_send(to[1], version, &b) == -1)
1274 fatal("ssh_keysign: couldn't send request");
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001275
Damien Miller901119b2002-10-04 11:10:04 +10001276 if (ssh_msg_recv(from[0], &b) < 0) {
Ben Lindstrom5206b952002-06-06 19:59:29 +00001277 error("ssh_keysign: no reply");
Damien Millerfb1310e2004-01-21 11:02:50 +11001278 buffer_free(&b);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001279 return -1;
1280 }
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001281 close(from[0]);
1282 close(to[1]);
1283
Ben Lindstromcec2ea82002-06-06 20:51:04 +00001284 while (waitpid(pid, &status, 0) < 0)
1285 if (errno != EINTR)
1286 break;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001287
Ben Lindstrom5206b952002-06-06 19:59:29 +00001288 if (buffer_get_char(&b) != version) {
1289 error("ssh_keysign: bad version");
Damien Millerfb1310e2004-01-21 11:02:50 +11001290 buffer_free(&b);
Ben Lindstrom5206b952002-06-06 19:59:29 +00001291 return -1;
1292 }
1293 *sigp = buffer_get_string(&b, lenp);
Damien Millerfb1310e2004-01-21 11:02:50 +11001294 buffer_free(&b);
Ben Lindstrom5206b952002-06-06 19:59:29 +00001295
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001296 return 0;
1297}
1298
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001299int
1300userauth_hostbased(Authctxt *authctxt)
1301{
1302 Key *private = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001303 Sensitive *sensitive = authctxt->sensitive;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001304 Buffer b;
1305 u_char *signature, *blob;
1306 char *chost, *pkalg, *p;
Ben Lindstrom671388f2001-04-19 20:40:45 +00001307 const char *service;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001308 u_int blen, slen;
Ben Lindstrom2bffd6f2001-04-19 20:35:40 +00001309 int ok, i, len, found = 0;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001310
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001311 /* check for a useful key */
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001312 for (i = 0; i < sensitive->nkeys; i++) {
1313 private = sensitive->keys[i];
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001314 if (private && private->type != KEY_RSA1) {
1315 found = 1;
1316 /* we take and free the key */
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001317 sensitive->keys[i] = NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001318 break;
1319 }
1320 }
1321 if (!found) {
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001322 debug("No more client hostkeys for hostbased authentication.");
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001323 return 0;
1324 }
1325 if (key_to_blob(private, &blob, &blen) == 0) {
1326 key_free(private);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001327 return 0;
1328 }
Damien Miller91c18472001-11-12 11:02:03 +11001329 /* figure out a name for the client host */
1330 p = get_local_name(packet_get_connection_in());
1331 if (p == NULL) {
1332 error("userauth_hostbased: cannot get local ipaddr/name");
1333 key_free(private);
1334 return 0;
1335 }
1336 len = strlen(p) + 2;
1337 chost = xmalloc(len);
1338 strlcpy(chost, p, len);
1339 strlcat(chost, ".", len);
1340 debug2("userauth_hostbased: chost %s", chost);
Damien Miller00111382003-03-10 11:21:17 +11001341 xfree(p);
Damien Miller91c18472001-11-12 11:02:03 +11001342
Ben Lindstrom671388f2001-04-19 20:40:45 +00001343 service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
1344 authctxt->service;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001345 pkalg = xstrdup(key_ssh_name(private));
1346 buffer_init(&b);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001347 /* construct data */
Ben Lindstrom671388f2001-04-19 20:40:45 +00001348 buffer_put_string(&b, session_id2, session_id2_len);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001349 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1350 buffer_put_cstring(&b, authctxt->server_user);
Ben Lindstrom671388f2001-04-19 20:40:45 +00001351 buffer_put_cstring(&b, service);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001352 buffer_put_cstring(&b, authctxt->method->name);
1353 buffer_put_cstring(&b, pkalg);
1354 buffer_put_string(&b, blob, blen);
1355 buffer_put_cstring(&b, chost);
1356 buffer_put_cstring(&b, authctxt->local_user);
1357#ifdef DEBUG_PK
1358 buffer_dump(&b);
1359#endif
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001360 if (sensitive->external_keysign)
1361 ok = ssh_keysign(private, &signature, &slen,
1362 buffer_ptr(&b), buffer_len(&b));
1363 else
1364 ok = key_sign(private, &signature, &slen,
1365 buffer_ptr(&b), buffer_len(&b));
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001366 key_free(private);
1367 buffer_free(&b);
1368 if (ok != 0) {
1369 error("key_sign failed");
1370 xfree(chost);
1371 xfree(pkalg);
1372 return 0;
1373 }
1374 packet_start(SSH2_MSG_USERAUTH_REQUEST);
1375 packet_put_cstring(authctxt->server_user);
1376 packet_put_cstring(authctxt->service);
1377 packet_put_cstring(authctxt->method->name);
1378 packet_put_cstring(pkalg);
1379 packet_put_string(blob, blen);
1380 packet_put_cstring(chost);
1381 packet_put_cstring(authctxt->local_user);
1382 packet_put_string(signature, slen);
1383 memset(signature, 's', slen);
1384 xfree(signature);
1385 xfree(chost);
1386 xfree(pkalg);
1387
1388 packet_send();
1389 return 1;
1390}
1391
Damien Miller62cee002000-09-23 17:15:56 +11001392/* find auth method */
1393
Damien Miller62cee002000-09-23 17:15:56 +11001394/*
1395 * given auth method name, if configurable options permit this method fill
1396 * in auth_ident field and return true, otherwise return false.
1397 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001398static int
Damien Miller62cee002000-09-23 17:15:56 +11001399authmethod_is_enabled(Authmethod *method)
1400{
1401 if (method == NULL)
1402 return 0;
1403 /* return false if options indicate this method is disabled */
1404 if (method->enabled == NULL || *method->enabled == 0)
1405 return 0;
1406 /* return false if batch mode is enabled but method needs interactive mode */
1407 if (method->batch_flag != NULL && *method->batch_flag != 0)
1408 return 0;
1409 return 1;
1410}
1411
Ben Lindstrombba81212001-06-25 05:01:22 +00001412static Authmethod *
Damien Miller62cee002000-09-23 17:15:56 +11001413authmethod_lookup(const char *name)
1414{
1415 Authmethod *method = NULL;
1416 if (name != NULL)
1417 for (method = authmethods; method->name != NULL; method++)
1418 if (strcmp(name, method->name) == 0)
1419 return method;
1420 debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
1421 return NULL;
1422}
1423
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001424/* XXX internal state */
1425static Authmethod *current = NULL;
1426static char *supported = NULL;
1427static char *preferred = NULL;
Ben Lindstrom5c385522002-06-23 21:23:20 +00001428
Damien Miller62cee002000-09-23 17:15:56 +11001429/*
1430 * Given the authentication method list sent by the server, return the
1431 * next method we should try. If the server initially sends a nil list,
Ben Lindstroma3700052001-04-05 23:26:32 +00001432 * use a built-in default list.
Kevin Stevesef4eea92001-02-05 12:42:17 +00001433 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001434static Authmethod *
Damien Miller62cee002000-09-23 17:15:56 +11001435authmethod_get(char *authlist)
1436{
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001437 char *name = NULL;
Ben Lindstromc58ab022002-02-26 18:15:09 +00001438 u_int next;
Kevin Stevesef4eea92001-02-05 12:42:17 +00001439
Damien Miller62cee002000-09-23 17:15:56 +11001440 /* Use a suitable default if we're passed a nil list. */
1441 if (authlist == NULL || strlen(authlist) == 0)
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001442 authlist = options.preferred_authentications;
Damien Miller62cee002000-09-23 17:15:56 +11001443
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001444 if (supported == NULL || strcmp(authlist, supported) != 0) {
1445 debug3("start over, passed a different list %s", authlist);
1446 if (supported != NULL)
1447 xfree(supported);
1448 supported = xstrdup(authlist);
1449 preferred = options.preferred_authentications;
1450 debug3("preferred %s", preferred);
1451 current = NULL;
1452 } else if (current != NULL && authmethod_is_enabled(current))
1453 return current;
Damien Millereba71ba2000-04-29 23:57:08 +10001454
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001455 for (;;) {
1456 if ((name = match_list(preferred, supported, &next)) == NULL) {
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001457 debug("No more authentication methods to try.");
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001458 current = NULL;
1459 return NULL;
Damien Miller874d77b2000-10-14 16:23:11 +11001460 }
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001461 preferred += next;
1462 debug3("authmethod_lookup %s", name);
1463 debug3("remaining preferred: %s", preferred);
1464 if ((current = authmethod_lookup(name)) != NULL &&
1465 authmethod_is_enabled(current)) {
1466 debug3("authmethod_is_enabled %s", name);
Ben Lindstrom1d568f92002-12-23 02:44:36 +00001467 debug("Next authentication method: %s", name);
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001468 return current;
1469 }
Damien Millereba71ba2000-04-29 23:57:08 +10001470 }
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001471}
Damien Miller62cee002000-09-23 17:15:56 +11001472
Ben Lindstrom79073822001-07-04 03:42:30 +00001473static char *
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001474authmethods_get(void)
1475{
1476 Authmethod *method = NULL;
Damien Miller0e3b8722002-01-22 23:26:38 +11001477 Buffer b;
1478 char *list;
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001479
Damien Miller0e3b8722002-01-22 23:26:38 +11001480 buffer_init(&b);
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001481 for (method = authmethods; method->name != NULL; method++) {
1482 if (authmethod_is_enabled(method)) {
Damien Miller0e3b8722002-01-22 23:26:38 +11001483 if (buffer_len(&b) > 0)
1484 buffer_append(&b, ",", 1);
1485 buffer_append(&b, method->name, strlen(method->name));
Ben Lindstromb9be60a2001-03-11 01:49:19 +00001486 }
Damien Miller62cee002000-09-23 17:15:56 +11001487 }
Damien Miller0e3b8722002-01-22 23:26:38 +11001488 buffer_append(&b, "\0", 1);
1489 list = xstrdup(buffer_ptr(&b));
1490 buffer_free(&b);
1491 return list;
Damien Millereba71ba2000-04-29 23:57:08 +10001492}