blob: d7722f4b9bf400becf267d73b07121e3b21732f9 [file] [log] [blame]
Damien Millereba71ba2000-04-29 23:57:08 +10001/*
2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Millereba71ba2000-04-29 23:57:08 +10005 * Code to connect to a remote host, and to perform the client side of the
6 * login (authentication) dialog.
7 *
Damien Millere4340be2000-09-16 13:29:08 +11008 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
Damien Millereba71ba2000-04-29 23:57:08 +100013 */
14
15#include "includes.h"
Damien Miller2ce18da2002-02-13 13:54:27 +110016RCSID("$OpenBSD: sshconnect1.c,v 1.48 2002/02/11 16:15:46 markus Exp $");
Damien Millereba71ba2000-04-29 23:57:08 +100017
18#include <openssl/bn.h>
Damien Miller2ce18da2002-02-13 13:54:27 +110019#include <openssl/md5.h>
Damien Millereba71ba2000-04-29 23:57:08 +100020
Ben Lindstrom226cfa02001-01-22 05:34:40 +000021#ifdef KRB4
22#include <krb.h>
Ben Lindstrom226cfa02001-01-22 05:34:40 +000023#endif
Ben Lindstromec95ed92001-07-04 04:21:14 +000024#ifdef KRB5
25#include <krb5.h>
26#endif
Ben Lindstrom226cfa02001-01-22 05:34:40 +000027#ifdef AFS
28#include <kafs.h>
Ben Lindstromb1985f72001-01-23 00:19:15 +000029#include "radix.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000030#endif
31
32#include "ssh.h"
33#include "ssh1.h"
Damien Millereba71ba2000-04-29 23:57:08 +100034#include "xmalloc.h"
35#include "rsa.h"
Damien Millereba71ba2000-04-29 23:57:08 +100036#include "buffer.h"
37#include "packet.h"
Damien Millereba71ba2000-04-29 23:57:08 +100038#include "mpaux.h"
39#include "uidswap.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000040#include "log.h"
Damien Millereba71ba2000-04-29 23:57:08 +100041#include "readconf.h"
42#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100043#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100044#include "sshconnect.h"
45#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000046#include "readpass.h"
47#include "cipher.h"
48#include "canohost.h"
Ben Lindstromec95ed92001-07-04 04:21:14 +000049#include "auth.h"
Damien Millereba71ba2000-04-29 23:57:08 +100050
51/* Session id for the current session. */
Ben Lindstrom46c16222000-12-22 01:43:59 +000052u_char session_id[16];
53u_int supported_authentications = 0;
Damien Millereba71ba2000-04-29 23:57:08 +100054
55extern Options options;
56extern char *__progname;
57
58/*
59 * Checks if the user has an authentication agent, and if so, tries to
60 * authenticate using the agent.
61 */
Ben Lindstrombba81212001-06-25 05:01:22 +000062static int
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000063try_agent_authentication(void)
Damien Millereba71ba2000-04-29 23:57:08 +100064{
Damien Millerad833b32000-08-23 10:46:23 +100065 int type;
Damien Millereba71ba2000-04-29 23:57:08 +100066 char *comment;
67 AuthenticationConnection *auth;
Ben Lindstrom46c16222000-12-22 01:43:59 +000068 u_char response[16];
69 u_int i;
Damien Millerad833b32000-08-23 10:46:23 +100070 Key *key;
71 BIGNUM *challenge;
Damien Millereba71ba2000-04-29 23:57:08 +100072
73 /* Get connection to the agent. */
74 auth = ssh_get_authentication_connection();
75 if (!auth)
76 return 0;
77
Damien Millerda755162002-01-22 23:09:22 +110078 if ((challenge = BN_new()) == NULL)
79 fatal("try_agent_authentication: BN_new failed");
Damien Millereba71ba2000-04-29 23:57:08 +100080 /* Loop through identities served by the agent. */
Damien Millerad833b32000-08-23 10:46:23 +100081 for (key = ssh_get_first_identity(auth, &comment, 1);
Damien Miller9f0f5c62001-12-21 14:45:46 +110082 key != NULL;
83 key = ssh_get_next_identity(auth, &comment, 1)) {
Damien Millereba71ba2000-04-29 23:57:08 +100084
85 /* Try this identity. */
86 debug("Trying RSA authentication via agent with '%.100s'", comment);
87 xfree(comment);
88
89 /* Tell the server that we are willing to authenticate using this key. */
90 packet_start(SSH_CMSG_AUTH_RSA);
Damien Millerad833b32000-08-23 10:46:23 +100091 packet_put_bignum(key->rsa->n);
Damien Millereba71ba2000-04-29 23:57:08 +100092 packet_send();
93 packet_write_wait();
94
95 /* Wait for server's response. */
Damien Millerdff50992002-01-22 23:16:32 +110096 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +100097
98 /* The server sends failure if it doesn\'t like our key or
99 does not support RSA authentication. */
100 if (type == SSH_SMSG_FAILURE) {
101 debug("Server refused our key.");
Damien Millerad833b32000-08-23 10:46:23 +1000102 key_free(key);
Damien Millereba71ba2000-04-29 23:57:08 +1000103 continue;
104 }
105 /* Otherwise it should have sent a challenge. */
106 if (type != SSH_SMSG_AUTH_RSA_CHALLENGE)
107 packet_disconnect("Protocol error during RSA authentication: %d",
108 type);
109
Damien Millerd432ccf2002-01-22 23:14:44 +1100110 packet_get_bignum(challenge);
Damien Miller48b03fc2002-01-22 23:11:40 +1100111 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000112
113 debug("Received RSA challenge from server.");
114
115 /* Ask the agent to decrypt the challenge. */
Damien Millerad833b32000-08-23 10:46:23 +1000116 if (!ssh_decrypt_challenge(auth, key, challenge, session_id, 1, response)) {
117 /*
118 * The agent failed to authenticate this identifier
119 * although it advertised it supports this. Just
120 * return a wrong value.
121 */
Damien Millereba71ba2000-04-29 23:57:08 +1000122 log("Authentication agent failed to decrypt challenge.");
123 memset(response, 0, sizeof(response));
124 }
Damien Millerad833b32000-08-23 10:46:23 +1000125 key_free(key);
Damien Millereba71ba2000-04-29 23:57:08 +1000126 debug("Sending response to RSA challenge.");
127
128 /* Send the decrypted challenge back to the server. */
129 packet_start(SSH_CMSG_AUTH_RSA_RESPONSE);
130 for (i = 0; i < 16; i++)
131 packet_put_char(response[i]);
132 packet_send();
133 packet_write_wait();
134
135 /* Wait for response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100136 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000137
138 /* The server returns success if it accepted the authentication. */
139 if (type == SSH_SMSG_SUCCESS) {
Ben Lindstrom48bd7c12001-01-09 00:35:42 +0000140 ssh_close_authentication_connection(auth);
Damien Millereba71ba2000-04-29 23:57:08 +1000141 BN_clear_free(challenge);
Damien Millerad833b32000-08-23 10:46:23 +1000142 debug("RSA authentication accepted by server.");
Damien Millereba71ba2000-04-29 23:57:08 +1000143 return 1;
144 }
145 /* Otherwise it should return failure. */
146 if (type != SSH_SMSG_FAILURE)
147 packet_disconnect("Protocol error waiting RSA auth response: %d",
148 type);
149 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +0000150 ssh_close_authentication_connection(auth);
Damien Millereba71ba2000-04-29 23:57:08 +1000151 BN_clear_free(challenge);
Damien Millereba71ba2000-04-29 23:57:08 +1000152 debug("RSA authentication using agent refused.");
153 return 0;
154}
155
156/*
157 * Computes the proper response to a RSA challenge, and sends the response to
158 * the server.
159 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000160static void
Damien Millereba71ba2000-04-29 23:57:08 +1000161respond_to_rsa_challenge(BIGNUM * challenge, RSA * prv)
162{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000163 u_char buf[32], response[16];
Damien Millereba71ba2000-04-29 23:57:08 +1000164 MD5_CTX md;
165 int i, len;
166
167 /* Decrypt the challenge using the private key. */
Damien Miller7650bc62001-01-30 09:27:26 +1100168 /* XXX think about Bleichenbacher, too */
169 if (rsa_private_decrypt(challenge, challenge, prv) <= 0)
170 packet_disconnect(
171 "respond_to_rsa_challenge: rsa_private_decrypt failed");
Damien Millereba71ba2000-04-29 23:57:08 +1000172
173 /* Compute the response. */
174 /* The response is MD5 of decrypted challenge plus session id. */
175 len = BN_num_bytes(challenge);
176 if (len <= 0 || len > sizeof(buf))
Damien Miller7650bc62001-01-30 09:27:26 +1100177 packet_disconnect(
178 "respond_to_rsa_challenge: bad challenge length %d", len);
Damien Millereba71ba2000-04-29 23:57:08 +1000179
180 memset(buf, 0, sizeof(buf));
181 BN_bn2bin(challenge, buf + sizeof(buf) - len);
182 MD5_Init(&md);
183 MD5_Update(&md, buf, 32);
184 MD5_Update(&md, session_id, 16);
185 MD5_Final(response, &md);
186
187 debug("Sending response to host key RSA challenge.");
188
189 /* Send the response back to the server. */
190 packet_start(SSH_CMSG_AUTH_RSA_RESPONSE);
191 for (i = 0; i < 16; i++)
192 packet_put_char(response[i]);
193 packet_send();
194 packet_write_wait();
195
196 memset(buf, 0, sizeof(buf));
197 memset(response, 0, sizeof(response));
198 memset(&md, 0, sizeof(md));
199}
200
201/*
202 * Checks if the user has authentication file, and if so, tries to authenticate
203 * the user using it.
204 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000205static int
Ben Lindstromc5b68002001-07-04 04:52:03 +0000206try_rsa_authentication(int idx)
Damien Millereba71ba2000-04-29 23:57:08 +1000207{
208 BIGNUM *challenge;
Ben Lindstrom05209452001-06-25 05:16:02 +0000209 Key *public, *private;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000210 char buf[300], *passphrase, *comment, *authfile;
Damien Millerdff50992002-01-22 23:16:32 +1100211 int i, type, quit;
Damien Millereba71ba2000-04-29 23:57:08 +1000212
Ben Lindstromc5b68002001-07-04 04:52:03 +0000213 public = options.identity_keys[idx];
214 authfile = options.identity_files[idx];
215 comment = xstrdup(authfile);
216
Damien Millereba71ba2000-04-29 23:57:08 +1000217 debug("Trying RSA authentication with key '%.100s'", comment);
218
219 /* Tell the server that we are willing to authenticate using this key. */
220 packet_start(SSH_CMSG_AUTH_RSA);
221 packet_put_bignum(public->rsa->n);
222 packet_send();
223 packet_write_wait();
224
Damien Millereba71ba2000-04-29 23:57:08 +1000225 /* Wait for server's response. */
Damien Millerdff50992002-01-22 23:16:32 +1100226 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000227
228 /*
229 * The server responds with failure if it doesn\'t like our key or
230 * doesn\'t support RSA authentication.
231 */
232 if (type == SSH_SMSG_FAILURE) {
233 debug("Server refused our key.");
234 xfree(comment);
235 return 0;
236 }
237 /* Otherwise, the server should respond with a challenge. */
238 if (type != SSH_SMSG_AUTH_RSA_CHALLENGE)
239 packet_disconnect("Protocol error during RSA authentication: %d", type);
240
241 /* Get the challenge from the packet. */
Damien Millerda755162002-01-22 23:09:22 +1100242 if ((challenge = BN_new()) == NULL)
243 fatal("try_rsa_authentication: BN_new failed");
Damien Millerd432ccf2002-01-22 23:14:44 +1100244 packet_get_bignum(challenge);
Damien Miller48b03fc2002-01-22 23:11:40 +1100245 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000246
247 debug("Received RSA challenge from server.");
248
Damien Millereba71ba2000-04-29 23:57:08 +1000249 /*
Ben Lindstromc5b68002001-07-04 04:52:03 +0000250 * If the key is not stored in external hardware, we have to
251 * load the private key. Try first with empty passphrase; if it
Damien Millereba71ba2000-04-29 23:57:08 +1000252 * fails, ask for a passphrase.
253 */
Ben Lindstromc5b68002001-07-04 04:52:03 +0000254 if (public->flags && KEY_FLAG_EXT)
255 private = public;
256 else
257 private = key_load_private_type(KEY_RSA1, authfile, "", NULL);
Ben Lindstrom05209452001-06-25 05:16:02 +0000258 if (private == NULL && !options.batch_mode) {
259 snprintf(buf, sizeof(buf),
260 "Enter passphrase for RSA key '%.100s': ", comment);
261 for (i = 0; i < options.number_of_password_prompts; i++) {
Damien Millereba71ba2000-04-29 23:57:08 +1000262 passphrase = read_passphrase(buf, 0);
Ben Lindstrom05209452001-06-25 05:16:02 +0000263 if (strcmp(passphrase, "") != 0) {
264 private = key_load_private_type(KEY_RSA1,
265 authfile, passphrase, NULL);
266 quit = 0;
267 } else {
268 debug2("no passphrase given, try next key");
269 quit = 1;
270 }
Damien Millereba71ba2000-04-29 23:57:08 +1000271 memset(passphrase, 0, strlen(passphrase));
272 xfree(passphrase);
Ben Lindstrom05209452001-06-25 05:16:02 +0000273 if (private != NULL || quit)
274 break;
275 debug2("bad passphrase given, try again...");
Damien Millereba71ba2000-04-29 23:57:08 +1000276 }
Damien Millereba71ba2000-04-29 23:57:08 +1000277 }
278 /* We no longer need the comment. */
279 xfree(comment);
280
Ben Lindstrom05209452001-06-25 05:16:02 +0000281 if (private == NULL) {
282 if (!options.batch_mode)
283 error("Bad passphrase.");
284
285 /* Send a dummy response packet to avoid protocol error. */
286 packet_start(SSH_CMSG_AUTH_RSA_RESPONSE);
287 for (i = 0; i < 16; i++)
288 packet_put_char(0);
289 packet_send();
290 packet_write_wait();
291
292 /* Expect the server to reject it... */
Damien Millerdff50992002-01-22 23:16:32 +1100293 packet_read_expect(SSH_SMSG_FAILURE);
Ben Lindstrom05209452001-06-25 05:16:02 +0000294 BN_clear_free(challenge);
295 return 0;
296 }
297
Damien Millereba71ba2000-04-29 23:57:08 +1000298 /* Compute and send a response to the challenge. */
299 respond_to_rsa_challenge(challenge, private->rsa);
300
Ben Lindstromc5b68002001-07-04 04:52:03 +0000301 /* Destroy the private key unless it in external hardware. */
302 if (!(private->flags & KEY_FLAG_EXT))
303 key_free(private);
Damien Millereba71ba2000-04-29 23:57:08 +1000304
305 /* We no longer need the challenge. */
306 BN_clear_free(challenge);
307
308 /* Wait for response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100309 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000310 if (type == SSH_SMSG_SUCCESS) {
311 debug("RSA authentication accepted by server.");
312 return 1;
313 }
314 if (type != SSH_SMSG_FAILURE)
315 packet_disconnect("Protocol error waiting RSA auth response: %d", type);
316 debug("RSA authentication refused.");
317 return 0;
318}
319
320/*
321 * Tries to authenticate the user using combined rhosts or /etc/hosts.equiv
322 * authentication and RSA host authentication.
323 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000324static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000325try_rhosts_rsa_authentication(const char *local_user, Key * host_key)
Damien Millereba71ba2000-04-29 23:57:08 +1000326{
327 int type;
328 BIGNUM *challenge;
Damien Millereba71ba2000-04-29 23:57:08 +1000329
330 debug("Trying rhosts or /etc/hosts.equiv with RSA host authentication.");
331
332 /* Tell the server that we are willing to authenticate using this key. */
333 packet_start(SSH_CMSG_AUTH_RHOSTS_RSA);
Ben Lindstrom664408d2001-06-09 01:42:01 +0000334 packet_put_cstring(local_user);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000335 packet_put_int(BN_num_bits(host_key->rsa->n));
336 packet_put_bignum(host_key->rsa->e);
337 packet_put_bignum(host_key->rsa->n);
Damien Millereba71ba2000-04-29 23:57:08 +1000338 packet_send();
339 packet_write_wait();
340
341 /* Wait for server's response. */
Damien Millerdff50992002-01-22 23:16:32 +1100342 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000343
344 /* The server responds with failure if it doesn't admit our
345 .rhosts authentication or doesn't know our host key. */
346 if (type == SSH_SMSG_FAILURE) {
347 debug("Server refused our rhosts authentication or host key.");
348 return 0;
349 }
350 /* Otherwise, the server should respond with a challenge. */
351 if (type != SSH_SMSG_AUTH_RSA_CHALLENGE)
352 packet_disconnect("Protocol error during RSA authentication: %d", type);
353
354 /* Get the challenge from the packet. */
Damien Millerda755162002-01-22 23:09:22 +1100355 if ((challenge = BN_new()) == NULL)
356 fatal("try_rhosts_rsa_authentication: BN_new failed");
Damien Millerd432ccf2002-01-22 23:14:44 +1100357 packet_get_bignum(challenge);
Damien Miller48b03fc2002-01-22 23:11:40 +1100358 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000359
360 debug("Received RSA challenge for host key from server.");
361
362 /* Compute a response to the challenge. */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000363 respond_to_rsa_challenge(challenge, host_key->rsa);
Damien Millereba71ba2000-04-29 23:57:08 +1000364
365 /* We no longer need the challenge. */
366 BN_clear_free(challenge);
367
368 /* Wait for response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100369 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000370 if (type == SSH_SMSG_SUCCESS) {
371 debug("Rhosts or /etc/hosts.equiv with RSA host authentication accepted by server.");
372 return 1;
373 }
374 if (type != SSH_SMSG_FAILURE)
375 packet_disconnect("Protocol error waiting RSA auth response: %d", type);
376 debug("Rhosts or /etc/hosts.equiv with RSA host authentication refused.");
377 return 0;
378}
379
380#ifdef KRB4
Ben Lindstrombba81212001-06-25 05:01:22 +0000381static int
Ben Lindstromec95ed92001-07-04 04:21:14 +0000382try_krb4_authentication(void)
Damien Millereba71ba2000-04-29 23:57:08 +1000383{
384 KTEXT_ST auth; /* Kerberos data */
385 char *reply;
386 char inst[INST_SZ];
387 char *realm;
388 CREDENTIALS cred;
Damien Millerdff50992002-01-22 23:16:32 +1100389 int r, type;
Damien Millereba71ba2000-04-29 23:57:08 +1000390 socklen_t slen;
391 Key_schedule schedule;
392 u_long checksum, cksum;
393 MSG_DAT msg_data;
394 struct sockaddr_in local, foreign;
395 struct stat st;
396
397 /* Don't do anything if we don't have any tickets. */
398 if (stat(tkt_string(), &st) < 0)
399 return 0;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100400
Ben Lindstromec95ed92001-07-04 04:21:14 +0000401 strlcpy(inst, (char *)krb_get_phost(get_canonical_hostname(1)),
402 INST_SZ);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100403
Ben Lindstromec95ed92001-07-04 04:21:14 +0000404 realm = (char *)krb_realmofhost(get_canonical_hostname(1));
Damien Millereba71ba2000-04-29 23:57:08 +1000405 if (!realm) {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000406 debug("Kerberos v4: no realm for %s", get_canonical_hostname(1));
Damien Millereba71ba2000-04-29 23:57:08 +1000407 return 0;
408 }
409 /* This can really be anything. */
Ben Lindstromec95ed92001-07-04 04:21:14 +0000410 checksum = (u_long)getpid();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100411
Damien Millereba71ba2000-04-29 23:57:08 +1000412 r = krb_mk_req(&auth, KRB4_SERVICE_NAME, inst, realm, checksum);
413 if (r != KSUCCESS) {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000414 debug("Kerberos v4 krb_mk_req failed: %s", krb_err_txt[r]);
Damien Millereba71ba2000-04-29 23:57:08 +1000415 return 0;
416 }
417 /* Get session key to decrypt the server's reply with. */
418 r = krb_get_cred(KRB4_SERVICE_NAME, inst, realm, &cred);
419 if (r != KSUCCESS) {
420 debug("get_cred failed: %s", krb_err_txt[r]);
421 return 0;
422 }
423 des_key_sched((des_cblock *) cred.session, schedule);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100424
Damien Millereba71ba2000-04-29 23:57:08 +1000425 /* Send authentication info to server. */
426 packet_start(SSH_CMSG_AUTH_KERBEROS);
427 packet_put_string((char *) auth.dat, auth.length);
428 packet_send();
429 packet_write_wait();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100430
Damien Millereba71ba2000-04-29 23:57:08 +1000431 /* Zero the buffer. */
432 (void) memset(auth.dat, 0, MAX_KTXT_LEN);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100433
Damien Millereba71ba2000-04-29 23:57:08 +1000434 slen = sizeof(local);
435 memset(&local, 0, sizeof(local));
436 if (getsockname(packet_get_connection_in(),
Ben Lindstromec95ed92001-07-04 04:21:14 +0000437 (struct sockaddr *)&local, &slen) < 0)
Damien Millereba71ba2000-04-29 23:57:08 +1000438 debug("getsockname failed: %s", strerror(errno));
Damien Miller9f0f5c62001-12-21 14:45:46 +1100439
Damien Millereba71ba2000-04-29 23:57:08 +1000440 slen = sizeof(foreign);
441 memset(&foreign, 0, sizeof(foreign));
442 if (getpeername(packet_get_connection_in(),
Ben Lindstromec95ed92001-07-04 04:21:14 +0000443 (struct sockaddr *)&foreign, &slen) < 0) {
Damien Millereba71ba2000-04-29 23:57:08 +1000444 debug("getpeername failed: %s", strerror(errno));
445 fatal_cleanup();
446 }
447 /* Get server reply. */
Damien Millerdff50992002-01-22 23:16:32 +1100448 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000449 switch (type) {
450 case SSH_SMSG_FAILURE:
451 /* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */
Ben Lindstromec95ed92001-07-04 04:21:14 +0000452 debug("Kerberos v4 authentication failed.");
Damien Millereba71ba2000-04-29 23:57:08 +1000453 return 0;
454 break;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100455
Damien Millereba71ba2000-04-29 23:57:08 +1000456 case SSH_SMSG_AUTH_KERBEROS_RESPONSE:
457 /* SSH_SMSG_AUTH_KERBEROS_SUCCESS */
Ben Lindstromec95ed92001-07-04 04:21:14 +0000458 debug("Kerberos v4 authentication accepted.");
Damien Miller9f0f5c62001-12-21 14:45:46 +1100459
Damien Millereba71ba2000-04-29 23:57:08 +1000460 /* Get server's response. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000461 reply = packet_get_string((u_int *) &auth.length);
Damien Millereba71ba2000-04-29 23:57:08 +1000462 memcpy(auth.dat, reply, auth.length);
463 xfree(reply);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100464
Damien Miller48b03fc2002-01-22 23:11:40 +1100465 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100466
Damien Millereba71ba2000-04-29 23:57:08 +1000467 /*
468 * If his response isn't properly encrypted with the session
469 * key, and the decrypted checksum fails to match, he's
470 * bogus. Bail out.
471 */
472 r = krb_rd_priv(auth.dat, auth.length, schedule, &cred.session,
Ben Lindstromec95ed92001-07-04 04:21:14 +0000473 &foreign, &local, &msg_data);
Damien Millereba71ba2000-04-29 23:57:08 +1000474 if (r != KSUCCESS) {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000475 debug("Kerberos v4 krb_rd_priv failed: %s",
476 krb_err_txt[r]);
477 packet_disconnect("Kerberos v4 challenge failed!");
Damien Millereba71ba2000-04-29 23:57:08 +1000478 }
479 /* Fetch the (incremented) checksum that we supplied in the request. */
Ben Lindstromec95ed92001-07-04 04:21:14 +0000480 memcpy((char *)&cksum, (char *)msg_data.app_data,
481 sizeof(cksum));
Damien Millereba71ba2000-04-29 23:57:08 +1000482 cksum = ntohl(cksum);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100483
Damien Millereba71ba2000-04-29 23:57:08 +1000484 /* If it matches, we're golden. */
485 if (cksum == checksum + 1) {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000486 debug("Kerberos v4 challenge successful.");
Damien Millereba71ba2000-04-29 23:57:08 +1000487 return 1;
488 } else
Ben Lindstromec95ed92001-07-04 04:21:14 +0000489 packet_disconnect("Kerberos v4 challenge failed!");
Damien Millereba71ba2000-04-29 23:57:08 +1000490 break;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100491
Damien Millereba71ba2000-04-29 23:57:08 +1000492 default:
Ben Lindstromec95ed92001-07-04 04:21:14 +0000493 packet_disconnect("Protocol error on Kerberos v4 response: %d", type);
Damien Millereba71ba2000-04-29 23:57:08 +1000494 }
495 return 0;
496}
497
498#endif /* KRB4 */
499
Ben Lindstromec95ed92001-07-04 04:21:14 +0000500#ifdef KRB5
Ben Lindstrombba81212001-06-25 05:01:22 +0000501static int
Ben Lindstromec95ed92001-07-04 04:21:14 +0000502try_krb5_authentication(krb5_context *context, krb5_auth_context *auth_context)
503{
504 krb5_error_code problem;
505 const char *tkfile;
506 struct stat buf;
507 krb5_ccache ccache = NULL;
508 const char *remotehost;
509 krb5_data ap;
Damien Millerdff50992002-01-22 23:16:32 +1100510 int type;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000511 krb5_ap_rep_enc_part *reply = NULL;
512 int ret;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100513
Ben Lindstromec95ed92001-07-04 04:21:14 +0000514 memset(&ap, 0, sizeof(ap));
Damien Miller9f0f5c62001-12-21 14:45:46 +1100515
Ben Lindstromec95ed92001-07-04 04:21:14 +0000516 problem = krb5_init_context(context);
517 if (problem) {
518 debug("Kerberos v5: krb5_init_context failed");
519 ret = 0;
520 goto out;
521 }
Damien Miller9f0f5c62001-12-21 14:45:46 +1100522
Ben Lindstromec95ed92001-07-04 04:21:14 +0000523 tkfile = krb5_cc_default_name(*context);
524 if (strncmp(tkfile, "FILE:", 5) == 0)
525 tkfile += 5;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100526
Ben Lindstromec95ed92001-07-04 04:21:14 +0000527 if (stat(tkfile, &buf) == 0 && getuid() != buf.st_uid) {
528 debug("Kerberos v5: could not get default ccache (permission denied).");
529 ret = 0;
530 goto out;
531 }
Damien Miller9f0f5c62001-12-21 14:45:46 +1100532
Ben Lindstromec95ed92001-07-04 04:21:14 +0000533 problem = krb5_cc_default(*context, &ccache);
534 if (problem) {
535 debug("Kerberos v5: krb5_cc_default failed: %s",
536 krb5_get_err_text(*context, problem));
537 ret = 0;
538 goto out;
539 }
Damien Miller9f0f5c62001-12-21 14:45:46 +1100540
Ben Lindstromec95ed92001-07-04 04:21:14 +0000541 remotehost = get_canonical_hostname(1);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100542
Ben Lindstromec95ed92001-07-04 04:21:14 +0000543 problem = krb5_mk_req(*context, auth_context, AP_OPTS_MUTUAL_REQUIRED,
544 "host", remotehost, NULL, ccache, &ap);
545 if (problem) {
546 debug("Kerberos v5: krb5_mk_req failed: %s",
547 krb5_get_err_text(*context, problem));
548 ret = 0;
549 goto out;
550 }
Damien Miller9f0f5c62001-12-21 14:45:46 +1100551
Ben Lindstromec95ed92001-07-04 04:21:14 +0000552 packet_start(SSH_CMSG_AUTH_KERBEROS);
553 packet_put_string((char *) ap.data, ap.length);
554 packet_send();
555 packet_write_wait();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100556
Ben Lindstromec95ed92001-07-04 04:21:14 +0000557 xfree(ap.data);
558 ap.length = 0;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100559
Damien Millerdff50992002-01-22 23:16:32 +1100560 type = packet_read();
Ben Lindstromec95ed92001-07-04 04:21:14 +0000561 switch (type) {
Damien Miller9f0f5c62001-12-21 14:45:46 +1100562 case SSH_SMSG_FAILURE:
563 /* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */
564 debug("Kerberos v5 authentication failed.");
565 ret = 0;
566 break;
567
Ben Lindstromec95ed92001-07-04 04:21:14 +0000568 case SSH_SMSG_AUTH_KERBEROS_RESPONSE:
Damien Miller9f0f5c62001-12-21 14:45:46 +1100569 /* SSH_SMSG_AUTH_KERBEROS_SUCCESS */
570 debug("Kerberos v5 authentication accepted.");
571
572 /* Get server's response. */
573 ap.data = packet_get_string((unsigned int *) &ap.length);
Damien Miller48b03fc2002-01-22 23:11:40 +1100574 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100575 /* XXX je to dobre? */
576
577 problem = krb5_rd_rep(*context, *auth_context, &ap, &reply);
578 if (problem) {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000579 ret = 0;
580 }
581 ret = 1;
582 break;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100583
Ben Lindstromec95ed92001-07-04 04:21:14 +0000584 default:
585 packet_disconnect("Protocol error on Kerberos v5 response: %d",
586 type);
587 ret = 0;
588 break;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100589
Ben Lindstromec95ed92001-07-04 04:21:14 +0000590 }
Damien Miller9f0f5c62001-12-21 14:45:46 +1100591
Ben Lindstromec95ed92001-07-04 04:21:14 +0000592 out:
593 if (ccache != NULL)
594 krb5_cc_close(*context, ccache);
595 if (reply != NULL)
596 krb5_free_ap_rep_enc_part(*context, reply);
597 if (ap.length > 0)
598 krb5_data_free(&ap);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100599
Ben Lindstromec95ed92001-07-04 04:21:14 +0000600 return (ret);
601}
602
603static void
604send_krb5_tgt(krb5_context context, krb5_auth_context auth_context)
605{
Damien Millerdff50992002-01-22 23:16:32 +1100606 int fd, type;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000607 krb5_error_code problem;
608 krb5_data outbuf;
609 krb5_ccache ccache = NULL;
610 krb5_creds creds;
611 krb5_kdc_flags flags;
612 const char *remotehost;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100613
Ben Lindstromec95ed92001-07-04 04:21:14 +0000614 memset(&creds, 0, sizeof(creds));
615 memset(&outbuf, 0, sizeof(outbuf));
Damien Miller9f0f5c62001-12-21 14:45:46 +1100616
Ben Lindstromec95ed92001-07-04 04:21:14 +0000617 fd = packet_get_connection_in();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100618
Ben Lindstromec95ed92001-07-04 04:21:14 +0000619 problem = krb5_auth_con_setaddrs_from_fd(context, auth_context, &fd);
620 if (problem)
621 goto out;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100622
Ben Lindstromec95ed92001-07-04 04:21:14 +0000623 problem = krb5_cc_default(context, &ccache);
624 if (problem)
625 goto out;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100626
Ben Lindstromec95ed92001-07-04 04:21:14 +0000627 problem = krb5_cc_get_principal(context, ccache, &creds.client);
628 if (problem)
629 goto out;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100630
Ben Lindstromec95ed92001-07-04 04:21:14 +0000631 problem = krb5_build_principal(context, &creds.server,
632 strlen(creds.client->realm), creds.client->realm,
633 "krbtgt", creds.client->realm, NULL);
634 if (problem)
635 goto out;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100636
Ben Lindstromec95ed92001-07-04 04:21:14 +0000637 creds.times.endtime = 0;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100638
Ben Lindstromec95ed92001-07-04 04:21:14 +0000639 flags.i = 0;
640 flags.b.forwarded = 1;
641 flags.b.forwardable = krb5_config_get_bool(context, NULL,
642 "libdefaults", "forwardable", NULL);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100643
Ben Lindstromec95ed92001-07-04 04:21:14 +0000644 remotehost = get_canonical_hostname(1);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100645
Ben Lindstromec95ed92001-07-04 04:21:14 +0000646 problem = krb5_get_forwarded_creds(context, auth_context,
647 ccache, flags.i, remotehost, &creds, &outbuf);
648 if (problem)
649 goto out;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100650
Ben Lindstromec95ed92001-07-04 04:21:14 +0000651 packet_start(SSH_CMSG_HAVE_KERBEROS_TGT);
652 packet_put_string((char *)outbuf.data, outbuf.length);
653 packet_send();
654 packet_write_wait();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100655
Damien Millerdff50992002-01-22 23:16:32 +1100656 type = packet_read();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100657
Ben Lindstromec95ed92001-07-04 04:21:14 +0000658 if (type == SSH_SMSG_SUCCESS) {
659 char *pname;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100660
Ben Lindstromec95ed92001-07-04 04:21:14 +0000661 krb5_unparse_name(context, creds.client, &pname);
662 debug("Kerberos v5 TGT forwarded (%s).", pname);
663 xfree(pname);
664 } else
665 debug("Kerberos v5 TGT forwarding failed.");
Damien Miller9f0f5c62001-12-21 14:45:46 +1100666
Ben Lindstromec95ed92001-07-04 04:21:14 +0000667 return;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100668
Ben Lindstromec95ed92001-07-04 04:21:14 +0000669 out:
670 if (problem)
671 debug("Kerberos v5 TGT forwarding failed: %s",
672 krb5_get_err_text(context, problem));
673 if (creds.client)
674 krb5_free_principal(context, creds.client);
675 if (creds.server)
676 krb5_free_principal(context, creds.server);
677 if (ccache)
678 krb5_cc_close(context, ccache);
679 if (outbuf.data)
680 xfree(outbuf.data);
681}
682#endif /* KRB5 */
683
684#ifdef AFS
685static void
686send_krb4_tgt(void)
Damien Millereba71ba2000-04-29 23:57:08 +1000687{
688 CREDENTIALS *creds;
Damien Millereba71ba2000-04-29 23:57:08 +1000689 struct stat st;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000690 char buffer[4096], pname[ANAME_SZ], pinst[INST_SZ], prealm[REALM_SZ];
Damien Millerdff50992002-01-22 23:16:32 +1100691 int problem, type;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100692
Damien Millereba71ba2000-04-29 23:57:08 +1000693 /* Don't do anything if we don't have any tickets. */
694 if (stat(tkt_string(), &st) < 0)
Ben Lindstromec95ed92001-07-04 04:21:14 +0000695 return;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100696
Damien Millereba71ba2000-04-29 23:57:08 +1000697 creds = xmalloc(sizeof(*creds));
Damien Miller9f0f5c62001-12-21 14:45:46 +1100698
Ben Lindstromec95ed92001-07-04 04:21:14 +0000699 problem = krb_get_tf_fullname(TKT_FILE, pname, pinst, prealm);
700 if (problem)
701 goto out;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100702
Ben Lindstromec95ed92001-07-04 04:21:14 +0000703 problem = krb_get_cred("krbtgt", prealm, prealm, creds);
704 if (problem)
705 goto out;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100706
Damien Millereba71ba2000-04-29 23:57:08 +1000707 if (time(0) > krb_life_to_time(creds->issue_date, creds->lifetime)) {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000708 problem = RD_AP_EXP;
709 goto out;
Damien Millereba71ba2000-04-29 23:57:08 +1000710 }
Ben Lindstromec95ed92001-07-04 04:21:14 +0000711 creds_to_radix(creds, (u_char *)buffer, sizeof(buffer));
Damien Miller9f0f5c62001-12-21 14:45:46 +1100712
Damien Millereba71ba2000-04-29 23:57:08 +1000713 packet_start(SSH_CMSG_HAVE_KERBEROS_TGT);
Ben Lindstrom664408d2001-06-09 01:42:01 +0000714 packet_put_cstring(buffer);
Damien Millereba71ba2000-04-29 23:57:08 +1000715 packet_send();
716 packet_write_wait();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100717
Damien Millerdff50992002-01-22 23:16:32 +1100718 type = packet_read();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100719
Ben Lindstromec95ed92001-07-04 04:21:14 +0000720 if (type == SSH_SMSG_SUCCESS)
721 debug("Kerberos v4 TGT forwarded (%s%s%s@%s).",
722 creds->pname, creds->pinst[0] ? "." : "",
723 creds->pinst, creds->realm);
724 else
725 debug("Kerberos v4 TGT rejected.");
Damien Miller9f0f5c62001-12-21 14:45:46 +1100726
Ben Lindstromec95ed92001-07-04 04:21:14 +0000727 xfree(creds);
728 return;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100729
Ben Lindstromec95ed92001-07-04 04:21:14 +0000730 out:
731 debug("Kerberos v4 TGT passing failed: %s", krb_err_txt[problem]);
732 xfree(creds);
Damien Millereba71ba2000-04-29 23:57:08 +1000733}
734
Ben Lindstrombba81212001-06-25 05:01:22 +0000735static void
Damien Millereba71ba2000-04-29 23:57:08 +1000736send_afs_tokens(void)
737{
738 CREDENTIALS creds;
739 struct ViceIoctl parms;
740 struct ClearToken ct;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000741 int i, type, len;
Damien Millereba71ba2000-04-29 23:57:08 +1000742 char buf[2048], *p, *server_cell;
743 char buffer[8192];
Damien Miller9f0f5c62001-12-21 14:45:46 +1100744
Damien Millereba71ba2000-04-29 23:57:08 +1000745 /* Move over ktc_GetToken, here's something leaner. */
746 for (i = 0; i < 100; i++) { /* just in case */
747 parms.in = (char *) &i;
748 parms.in_size = sizeof(i);
749 parms.out = buf;
750 parms.out_size = sizeof(buf);
751 if (k_pioctl(0, VIOCGETTOK, &parms, 0) != 0)
752 break;
753 p = buf;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100754
Damien Millereba71ba2000-04-29 23:57:08 +1000755 /* Get secret token. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000756 memcpy(&creds.ticket_st.length, p, sizeof(u_int));
Damien Millereba71ba2000-04-29 23:57:08 +1000757 if (creds.ticket_st.length > MAX_KTXT_LEN)
758 break;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000759 p += sizeof(u_int);
Damien Millereba71ba2000-04-29 23:57:08 +1000760 memcpy(creds.ticket_st.dat, p, creds.ticket_st.length);
761 p += creds.ticket_st.length;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100762
Damien Millereba71ba2000-04-29 23:57:08 +1000763 /* Get clear token. */
764 memcpy(&len, p, sizeof(len));
765 if (len != sizeof(struct ClearToken))
766 break;
767 p += sizeof(len);
768 memcpy(&ct, p, len);
769 p += len;
770 p += sizeof(len); /* primary flag */
771 server_cell = p;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100772
Damien Millereba71ba2000-04-29 23:57:08 +1000773 /* Flesh out our credentials. */
Ben Lindstromec95ed92001-07-04 04:21:14 +0000774 strlcpy(creds.service, "afs", sizeof(creds.service));
Damien Millereba71ba2000-04-29 23:57:08 +1000775 creds.instance[0] = '\0';
776 strlcpy(creds.realm, server_cell, REALM_SZ);
777 memcpy(creds.session, ct.HandShakeKey, DES_KEY_SZ);
778 creds.issue_date = ct.BeginTimestamp;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000779 creds.lifetime = krb_time_to_life(creds.issue_date,
780 ct.EndTimestamp);
Damien Millereba71ba2000-04-29 23:57:08 +1000781 creds.kvno = ct.AuthHandle;
782 snprintf(creds.pname, sizeof(creds.pname), "AFS ID %d", ct.ViceId);
783 creds.pinst[0] = '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +1100784
Damien Millereba71ba2000-04-29 23:57:08 +1000785 /* Encode token, ship it off. */
Ben Lindstromec95ed92001-07-04 04:21:14 +0000786 if (creds_to_radix(&creds, (u_char *)buffer,
787 sizeof(buffer)) <= 0)
Damien Millereba71ba2000-04-29 23:57:08 +1000788 break;
789 packet_start(SSH_CMSG_HAVE_AFS_TOKEN);
Ben Lindstrom664408d2001-06-09 01:42:01 +0000790 packet_put_cstring(buffer);
Damien Millereba71ba2000-04-29 23:57:08 +1000791 packet_send();
792 packet_write_wait();
793
794 /* Roger, Roger. Clearance, Clarence. What's your vector,
795 Victor? */
Damien Millerdff50992002-01-22 23:16:32 +1100796 type = packet_read();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100797
Damien Millereba71ba2000-04-29 23:57:08 +1000798 if (type == SSH_SMSG_FAILURE)
799 debug("AFS token for cell %s rejected.", server_cell);
800 else if (type != SSH_SMSG_SUCCESS)
801 packet_disconnect("Protocol error on AFS token response: %d", type);
802 }
803}
804
805#endif /* AFS */
806
807/*
808 * Tries to authenticate with any string-based challenge/response system.
809 * Note that the client code is not tied to s/key or TIS.
810 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000811static int
Ben Lindstrom551ea372001-06-05 18:56:16 +0000812try_challenge_response_authentication(void)
Damien Millereba71ba2000-04-29 23:57:08 +1000813{
814 int type, i;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000815 u_int clen;
Ben Lindstroma65c78a2000-12-10 22:57:30 +0000816 char prompt[1024];
Damien Millereba71ba2000-04-29 23:57:08 +1000817 char *challenge, *response;
Ben Lindstrombdfb4df2001-10-03 17:12:43 +0000818
819 debug("Doing challenge response authentication.");
820
Damien Millereba71ba2000-04-29 23:57:08 +1000821 for (i = 0; i < options.number_of_password_prompts; i++) {
Ben Lindstroma65c78a2000-12-10 22:57:30 +0000822 /* request a challenge */
823 packet_start(SSH_CMSG_AUTH_TIS);
824 packet_send();
825 packet_write_wait();
826
Damien Millerdff50992002-01-22 23:16:32 +1100827 type = packet_read();
Ben Lindstroma65c78a2000-12-10 22:57:30 +0000828 if (type != SSH_SMSG_FAILURE &&
829 type != SSH_SMSG_AUTH_TIS_CHALLENGE) {
830 packet_disconnect("Protocol error: got %d in response "
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +0000831 "to SSH_CMSG_AUTH_TIS", type);
Ben Lindstroma65c78a2000-12-10 22:57:30 +0000832 }
833 if (type != SSH_SMSG_AUTH_TIS_CHALLENGE) {
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +0000834 debug("No challenge.");
Ben Lindstroma65c78a2000-12-10 22:57:30 +0000835 return 0;
836 }
837 challenge = packet_get_string(&clen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100838 packet_check_eom();
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000839 snprintf(prompt, sizeof prompt, "%s%s", challenge,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100840 strchr(challenge, '\n') ? "" : "\nResponse: ");
Ben Lindstroma65c78a2000-12-10 22:57:30 +0000841 xfree(challenge);
Damien Millereba71ba2000-04-29 23:57:08 +1000842 if (i != 0)
843 error("Permission denied, please try again.");
Ben Lindstroma65c78a2000-12-10 22:57:30 +0000844 if (options.cipher == SSH_CIPHER_NONE)
845 log("WARNING: Encryption is disabled! "
846 "Reponse will be transmitted in clear text.");
847 response = read_passphrase(prompt, 0);
848 if (strcmp(response, "") == 0) {
849 xfree(response);
850 break;
851 }
Damien Millereba71ba2000-04-29 23:57:08 +1000852 packet_start(SSH_CMSG_AUTH_TIS_RESPONSE);
Damien Miller79438cc2001-02-16 12:34:57 +1100853 ssh_put_password(response);
Damien Millereba71ba2000-04-29 23:57:08 +1000854 memset(response, 0, strlen(response));
855 xfree(response);
856 packet_send();
857 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100858 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000859 if (type == SSH_SMSG_SUCCESS)
860 return 1;
861 if (type != SSH_SMSG_FAILURE)
862 packet_disconnect("Protocol error: got %d in response "
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +0000863 "to SSH_CMSG_AUTH_TIS_RESPONSE", type);
Damien Millereba71ba2000-04-29 23:57:08 +1000864 }
865 /* failure */
866 return 0;
867}
868
869/*
870 * Tries to authenticate with plain passwd authentication.
871 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000872static int
Damien Millereba71ba2000-04-29 23:57:08 +1000873try_password_authentication(char *prompt)
874{
Damien Millerdff50992002-01-22 23:16:32 +1100875 int type, i;
Damien Millereba71ba2000-04-29 23:57:08 +1000876 char *password;
877
878 debug("Doing password authentication.");
879 if (options.cipher == SSH_CIPHER_NONE)
880 log("WARNING: Encryption is disabled! Password will be transmitted in clear text.");
881 for (i = 0; i < options.number_of_password_prompts; i++) {
882 if (i != 0)
883 error("Permission denied, please try again.");
884 password = read_passphrase(prompt, 0);
885 packet_start(SSH_CMSG_AUTH_PASSWORD);
Damien Miller79438cc2001-02-16 12:34:57 +1100886 ssh_put_password(password);
Damien Millereba71ba2000-04-29 23:57:08 +1000887 memset(password, 0, strlen(password));
888 xfree(password);
889 packet_send();
890 packet_write_wait();
891
Damien Millerdff50992002-01-22 23:16:32 +1100892 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000893 if (type == SSH_SMSG_SUCCESS)
894 return 1;
895 if (type != SSH_SMSG_FAILURE)
896 packet_disconnect("Protocol error: got %d in response to passwd auth", type);
897 }
898 /* failure */
899 return 0;
900}
901
902/*
903 * SSH1 key exchange
904 */
905void
906ssh_kex(char *host, struct sockaddr *hostaddr)
907{
908 int i;
909 BIGNUM *key;
Damien Millerda755162002-01-22 23:09:22 +1100910 Key *host_key, *server_key;
Damien Millereba71ba2000-04-29 23:57:08 +1000911 int bits, rbits;
912 int ssh_cipher_default = SSH_CIPHER_3DES;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000913 u_char session_key[SSH_SESSION_KEY_LENGTH];
914 u_char cookie[8];
915 u_int supported_ciphers;
916 u_int server_flags, client_flags;
Damien Millereba71ba2000-04-29 23:57:08 +1000917 u_int32_t rand = 0;
918
919 debug("Waiting for server public key.");
920
921 /* Wait for a public key packet from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100922 packet_read_expect(SSH_SMSG_PUBLIC_KEY);
Damien Millereba71ba2000-04-29 23:57:08 +1000923
924 /* Get cookie from the packet. */
925 for (i = 0; i < 8; i++)
926 cookie[i] = packet_get_char();
927
928 /* Get the public key. */
Damien Millerda755162002-01-22 23:09:22 +1100929 server_key = key_new(KEY_RSA1);
930 bits = packet_get_int();
Damien Millerd432ccf2002-01-22 23:14:44 +1100931 packet_get_bignum(server_key->rsa->e);
932 packet_get_bignum(server_key->rsa->n);
Damien Millereba71ba2000-04-29 23:57:08 +1000933
Damien Millerda755162002-01-22 23:09:22 +1100934 rbits = BN_num_bits(server_key->rsa->n);
Damien Millereba71ba2000-04-29 23:57:08 +1000935 if (bits != rbits) {
936 log("Warning: Server lies about size of server public key: "
937 "actual size is %d bits vs. announced %d.", rbits, bits);
938 log("Warning: This may be due to an old implementation of ssh.");
939 }
940 /* Get the host key. */
Damien Millerda755162002-01-22 23:09:22 +1100941 host_key = key_new(KEY_RSA1);
942 bits = packet_get_int();
Damien Millerd432ccf2002-01-22 23:14:44 +1100943 packet_get_bignum(host_key->rsa->e);
944 packet_get_bignum(host_key->rsa->n);
Damien Millereba71ba2000-04-29 23:57:08 +1000945
Damien Millerda755162002-01-22 23:09:22 +1100946 rbits = BN_num_bits(host_key->rsa->n);
Damien Millereba71ba2000-04-29 23:57:08 +1000947 if (bits != rbits) {
948 log("Warning: Server lies about size of server host key: "
949 "actual size is %d bits vs. announced %d.", rbits, bits);
950 log("Warning: This may be due to an old implementation of ssh.");
951 }
952
953 /* Get protocol flags. */
954 server_flags = packet_get_int();
955 packet_set_protocol_flags(server_flags);
956
957 supported_ciphers = packet_get_int();
958 supported_authentications = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +1100959 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000960
961 debug("Received server public key (%d bits) and host key (%d bits).",
Damien Millerda755162002-01-22 23:09:22 +1100962 BN_num_bits(server_key->rsa->n), BN_num_bits(host_key->rsa->n));
Damien Millereba71ba2000-04-29 23:57:08 +1000963
Damien Millerda755162002-01-22 23:09:22 +1100964 if (verify_host_key(host, hostaddr, host_key) == -1)
Damien Miller59d9fb92001-10-10 15:03:11 +1000965 fatal("Host key verification failed.");
Damien Millereba71ba2000-04-29 23:57:08 +1000966
967 client_flags = SSH_PROTOFLAG_SCREEN_NUMBER | SSH_PROTOFLAG_HOST_IN_FWD_OPEN;
968
Damien Millerda755162002-01-22 23:09:22 +1100969 compute_session_id(session_id, cookie, host_key->rsa->n, server_key->rsa->n);
Damien Millereba71ba2000-04-29 23:57:08 +1000970
971 /* Generate a session key. */
972 arc4random_stir();
973
974 /*
975 * Generate an encryption key for the session. The key is a 256 bit
976 * random number, interpreted as a 32-byte key, with the least
977 * significant 8 bits being the first byte of the key.
978 */
979 for (i = 0; i < 32; i++) {
980 if (i % 4 == 0)
981 rand = arc4random();
982 session_key[i] = rand & 0xff;
983 rand >>= 8;
984 }
985
986 /*
987 * According to the protocol spec, the first byte of the session key
988 * is the highest byte of the integer. The session key is xored with
989 * the first 16 bytes of the session id.
990 */
Damien Millerda755162002-01-22 23:09:22 +1100991 if ((key = BN_new()) == NULL)
992 fatal("respond_to_rsa_challenge: BN_new failed");
Damien Millereba71ba2000-04-29 23:57:08 +1000993 BN_set_word(key, 0);
994 for (i = 0; i < SSH_SESSION_KEY_LENGTH; i++) {
995 BN_lshift(key, key, 8);
996 if (i < 16)
997 BN_add_word(key, session_key[i] ^ session_id[i]);
998 else
999 BN_add_word(key, session_key[i]);
1000 }
1001
1002 /*
1003 * Encrypt the integer using the public key and host key of the
1004 * server (key with smaller modulus first).
1005 */
Damien Millerda755162002-01-22 23:09:22 +11001006 if (BN_cmp(server_key->rsa->n, host_key->rsa->n) < 0) {
Damien Millereba71ba2000-04-29 23:57:08 +10001007 /* Public key has smaller modulus. */
Damien Millerda755162002-01-22 23:09:22 +11001008 if (BN_num_bits(host_key->rsa->n) <
1009 BN_num_bits(server_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
1010 fatal("respond_to_rsa_challenge: host_key %d < server_key %d + "
Damien Miller9f0f5c62001-12-21 14:45:46 +11001011 "SSH_KEY_BITS_RESERVED %d",
Damien Millerda755162002-01-22 23:09:22 +11001012 BN_num_bits(host_key->rsa->n),
1013 BN_num_bits(server_key->rsa->n),
Damien Miller9f0f5c62001-12-21 14:45:46 +11001014 SSH_KEY_BITS_RESERVED);
Damien Millereba71ba2000-04-29 23:57:08 +10001015 }
Damien Millerda755162002-01-22 23:09:22 +11001016 rsa_public_encrypt(key, key, server_key->rsa);
1017 rsa_public_encrypt(key, key, host_key->rsa);
Damien Millereba71ba2000-04-29 23:57:08 +10001018 } else {
1019 /* Host key has smaller modulus (or they are equal). */
Damien Millerda755162002-01-22 23:09:22 +11001020 if (BN_num_bits(server_key->rsa->n) <
1021 BN_num_bits(host_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
1022 fatal("respond_to_rsa_challenge: server_key %d < host_key %d + "
Damien Miller9f0f5c62001-12-21 14:45:46 +11001023 "SSH_KEY_BITS_RESERVED %d",
Damien Millerda755162002-01-22 23:09:22 +11001024 BN_num_bits(server_key->rsa->n),
1025 BN_num_bits(host_key->rsa->n),
Damien Miller9f0f5c62001-12-21 14:45:46 +11001026 SSH_KEY_BITS_RESERVED);
Damien Millereba71ba2000-04-29 23:57:08 +10001027 }
Damien Millerda755162002-01-22 23:09:22 +11001028 rsa_public_encrypt(key, key, host_key->rsa);
1029 rsa_public_encrypt(key, key, server_key->rsa);
Damien Millereba71ba2000-04-29 23:57:08 +10001030 }
1031
1032 /* Destroy the public keys since we no longer need them. */
Damien Millerda755162002-01-22 23:09:22 +11001033 key_free(server_key);
1034 key_free(host_key);
Damien Millereba71ba2000-04-29 23:57:08 +10001035
Damien Millere39cacc2000-11-29 12:18:44 +11001036 if (options.cipher == SSH_CIPHER_NOT_SET) {
1037 if (cipher_mask_ssh1(1) & supported_ciphers & (1 << ssh_cipher_default))
1038 options.cipher = ssh_cipher_default;
1039 } else if (options.cipher == SSH_CIPHER_ILLEGAL ||
1040 !(cipher_mask_ssh1(1) & (1 << options.cipher))) {
Damien Miller30c3d422000-05-09 11:02:59 +10001041 log("No valid SSH1 cipher, using %.100s instead.",
Damien Miller874d77b2000-10-14 16:23:11 +11001042 cipher_name(ssh_cipher_default));
1043 options.cipher = ssh_cipher_default;
Damien Millereba71ba2000-04-29 23:57:08 +10001044 }
1045 /* Check that the selected cipher is supported. */
1046 if (!(supported_ciphers & (1 << options.cipher)))
1047 fatal("Selected cipher type %.100s not supported by server.",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001048 cipher_name(options.cipher));
Damien Millereba71ba2000-04-29 23:57:08 +10001049
1050 debug("Encryption type: %.100s", cipher_name(options.cipher));
1051
1052 /* Send the encrypted session key to the server. */
1053 packet_start(SSH_CMSG_SESSION_KEY);
1054 packet_put_char(options.cipher);
1055
1056 /* Send the cookie back to the server. */
1057 for (i = 0; i < 8; i++)
1058 packet_put_char(cookie[i]);
1059
1060 /* Send and destroy the encrypted encryption key integer. */
1061 packet_put_bignum(key);
1062 BN_clear_free(key);
1063
1064 /* Send protocol flags. */
1065 packet_put_int(client_flags);
1066
1067 /* Send the packet now. */
1068 packet_send();
1069 packet_write_wait();
1070
1071 debug("Sent encrypted session key.");
1072
1073 /* Set the encryption key. */
1074 packet_set_encryption_key(session_key, SSH_SESSION_KEY_LENGTH, options.cipher);
1075
1076 /* We will no longer need the session key here. Destroy any extra copies. */
1077 memset(session_key, 0, sizeof(session_key));
1078
1079 /*
1080 * Expect a success message from the server. Note that this message
1081 * will be received in encrypted form.
1082 */
Damien Millerdff50992002-01-22 23:16:32 +11001083 packet_read_expect(SSH_SMSG_SUCCESS);
Damien Millereba71ba2000-04-29 23:57:08 +10001084
1085 debug("Received encrypted confirmation.");
1086}
1087
1088/*
1089 * Authenticate user
1090 */
1091void
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001092ssh_userauth1(const char *local_user, const char *server_user, char *host,
1093 Key **keys, int nkeys)
Damien Millereba71ba2000-04-29 23:57:08 +10001094{
Ben Lindstromec95ed92001-07-04 04:21:14 +00001095#ifdef KRB5
1096 krb5_context context = NULL;
1097 krb5_auth_context auth_context = NULL;
1098#endif
Damien Millereba71ba2000-04-29 23:57:08 +10001099 int i, type;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001100
Damien Millereba71ba2000-04-29 23:57:08 +10001101 if (supported_authentications == 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001102 fatal("ssh_userauth1: server supports no auth methods");
Damien Millereba71ba2000-04-29 23:57:08 +10001103
1104 /* Send the name of the user to log in as on the server. */
1105 packet_start(SSH_CMSG_USER);
Ben Lindstrom664408d2001-06-09 01:42:01 +00001106 packet_put_cstring(server_user);
Damien Millereba71ba2000-04-29 23:57:08 +10001107 packet_send();
1108 packet_write_wait();
1109
1110 /*
1111 * The server should respond with success if no authentication is
1112 * needed (the user has no password). Otherwise the server responds
1113 * with failure.
1114 */
Damien Millerdff50992002-01-22 23:16:32 +11001115 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +10001116
1117 /* check whether the connection was accepted without authentication. */
1118 if (type == SSH_SMSG_SUCCESS)
Ben Lindstromec95ed92001-07-04 04:21:14 +00001119 goto success;
Damien Millereba71ba2000-04-29 23:57:08 +10001120 if (type != SSH_SMSG_FAILURE)
Ben Lindstromec95ed92001-07-04 04:21:14 +00001121 packet_disconnect("Protocol error: got %d in response to SSH_CMSG_USER", type);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001122
Ben Lindstromec95ed92001-07-04 04:21:14 +00001123#ifdef KRB5
1124 if ((supported_authentications & (1 << SSH_AUTH_KERBEROS)) &&
Damien Miller9f0f5c62001-12-21 14:45:46 +11001125 options.kerberos_authentication) {
Ben Lindstromec95ed92001-07-04 04:21:14 +00001126 debug("Trying Kerberos v5 authentication.");
Damien Miller9f0f5c62001-12-21 14:45:46 +11001127
Ben Lindstromec95ed92001-07-04 04:21:14 +00001128 if (try_krb5_authentication(&context, &auth_context)) {
Damien Millerdff50992002-01-22 23:16:32 +11001129 type = packet_read();
Ben Lindstromec95ed92001-07-04 04:21:14 +00001130 if (type == SSH_SMSG_SUCCESS)
1131 goto success;
1132 if (type != SSH_SMSG_FAILURE)
1133 packet_disconnect("Protocol error: got %d in response to Kerberos v5 auth", type);
1134 }
Damien Millereba71ba2000-04-29 23:57:08 +10001135 }
Ben Lindstromec95ed92001-07-04 04:21:14 +00001136#endif /* KRB5 */
Damien Miller9f0f5c62001-12-21 14:45:46 +11001137
Damien Millereba71ba2000-04-29 23:57:08 +10001138#ifdef KRB4
1139 if ((supported_authentications & (1 << SSH_AUTH_KERBEROS)) &&
1140 options.kerberos_authentication) {
Ben Lindstromec95ed92001-07-04 04:21:14 +00001141 debug("Trying Kerberos v4 authentication.");
Damien Miller9f0f5c62001-12-21 14:45:46 +11001142
Ben Lindstromec95ed92001-07-04 04:21:14 +00001143 if (try_krb4_authentication()) {
Damien Millerdff50992002-01-22 23:16:32 +11001144 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +10001145 if (type == SSH_SMSG_SUCCESS)
Ben Lindstromec95ed92001-07-04 04:21:14 +00001146 goto success;
Damien Millereba71ba2000-04-29 23:57:08 +10001147 if (type != SSH_SMSG_FAILURE)
Ben Lindstromec95ed92001-07-04 04:21:14 +00001148 packet_disconnect("Protocol error: got %d in response to Kerberos v4 auth", type);
Damien Millereba71ba2000-04-29 23:57:08 +10001149 }
1150 }
1151#endif /* KRB4 */
Damien Miller9f0f5c62001-12-21 14:45:46 +11001152
Damien Millereba71ba2000-04-29 23:57:08 +10001153 /*
1154 * Use rhosts authentication if running in privileged socket and we
1155 * do not wish to remain anonymous.
1156 */
1157 if ((supported_authentications & (1 << SSH_AUTH_RHOSTS)) &&
1158 options.rhosts_authentication) {
1159 debug("Trying rhosts authentication.");
1160 packet_start(SSH_CMSG_AUTH_RHOSTS);
Ben Lindstrom664408d2001-06-09 01:42:01 +00001161 packet_put_cstring(local_user);
Damien Millereba71ba2000-04-29 23:57:08 +10001162 packet_send();
1163 packet_write_wait();
1164
1165 /* The server should respond with success or failure. */
Damien Millerdff50992002-01-22 23:16:32 +11001166 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +10001167 if (type == SSH_SMSG_SUCCESS)
Ben Lindstromec95ed92001-07-04 04:21:14 +00001168 goto success;
Damien Millereba71ba2000-04-29 23:57:08 +10001169 if (type != SSH_SMSG_FAILURE)
1170 packet_disconnect("Protocol error: got %d in response to rhosts auth",
1171 type);
1172 }
1173 /*
1174 * Try .rhosts or /etc/hosts.equiv authentication with RSA host
1175 * authentication.
1176 */
1177 if ((supported_authentications & (1 << SSH_AUTH_RHOSTS_RSA)) &&
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001178 options.rhosts_rsa_authentication) {
1179 for (i = 0; i < nkeys; i++) {
Ben Lindstrom9cb59af2001-04-17 18:08:15 +00001180 if (keys[i] != NULL && keys[i]->type == KEY_RSA1 &&
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001181 try_rhosts_rsa_authentication(local_user, keys[i]))
Ben Lindstromec95ed92001-07-04 04:21:14 +00001182 goto success;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001183 }
Damien Millereba71ba2000-04-29 23:57:08 +10001184 }
1185 /* Try RSA authentication if the server supports it. */
1186 if ((supported_authentications & (1 << SSH_AUTH_RSA)) &&
1187 options.rsa_authentication) {
1188 /*
1189 * Try RSA authentication using the authentication agent. The
1190 * agent is tried first because no passphrase is needed for
1191 * it, whereas identity files may require passphrases.
1192 */
1193 if (try_agent_authentication())
Ben Lindstromec95ed92001-07-04 04:21:14 +00001194 goto success;
Damien Millereba71ba2000-04-29 23:57:08 +10001195
1196 /* Try RSA authentication for each identity. */
1197 for (i = 0; i < options.num_identity_files; i++)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001198 if (options.identity_keys[i] != NULL &&
1199 options.identity_keys[i]->type == KEY_RSA1 &&
Ben Lindstromc5b68002001-07-04 04:52:03 +00001200 try_rsa_authentication(i))
Ben Lindstromec95ed92001-07-04 04:21:14 +00001201 goto success;
Damien Millereba71ba2000-04-29 23:57:08 +10001202 }
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +00001203 /* Try challenge response authentication if the server supports it. */
Damien Millereba71ba2000-04-29 23:57:08 +10001204 if ((supported_authentications & (1 << SSH_AUTH_TIS)) &&
Ben Lindstrom551ea372001-06-05 18:56:16 +00001205 options.challenge_response_authentication && !options.batch_mode) {
1206 if (try_challenge_response_authentication())
Ben Lindstromec95ed92001-07-04 04:21:14 +00001207 goto success;
Damien Millereba71ba2000-04-29 23:57:08 +10001208 }
1209 /* Try password authentication if the server supports it. */
1210 if ((supported_authentications & (1 << SSH_AUTH_PASSWORD)) &&
1211 options.password_authentication && !options.batch_mode) {
1212 char prompt[80];
1213
Ben Lindstrome0557162001-02-11 00:00:24 +00001214 snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
Damien Millereba71ba2000-04-29 23:57:08 +10001215 server_user, host);
1216 if (try_password_authentication(prompt))
Ben Lindstromec95ed92001-07-04 04:21:14 +00001217 goto success;
Damien Millereba71ba2000-04-29 23:57:08 +10001218 }
1219 /* All authentication methods have failed. Exit with an error message. */
1220 fatal("Permission denied.");
1221 /* NOTREACHED */
Ben Lindstromec95ed92001-07-04 04:21:14 +00001222
1223 success:
1224#ifdef KRB5
1225 /* Try Kerberos v5 TGT passing. */
1226 if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) &&
1227 options.kerberos_tgt_passing && context && auth_context) {
1228 if (options.cipher == SSH_CIPHER_NONE)
1229 log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!");
1230 send_krb5_tgt(context, auth_context);
1231 }
1232 if (auth_context)
1233 krb5_auth_con_free(context, auth_context);
1234 if (context)
1235 krb5_free_context(context);
1236#endif
Damien Miller9f0f5c62001-12-21 14:45:46 +11001237
Ben Lindstromec95ed92001-07-04 04:21:14 +00001238#ifdef AFS
1239 /* Try Kerberos v4 TGT passing if the server supports it. */
1240 if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) &&
1241 options.kerberos_tgt_passing) {
1242 if (options.cipher == SSH_CIPHER_NONE)
1243 log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!");
1244 send_krb4_tgt();
1245 }
1246 /* Try AFS token passing if the server supports it. */
1247 if ((supported_authentications & (1 << SSH_PASS_AFS_TOKEN)) &&
1248 options.afs_token_passing && k_hasafs()) {
1249 if (options.cipher == SSH_CIPHER_NONE)
1250 log("WARNING: Encryption is disabled! Token will be transmitted in the clear!");
1251 send_afs_tokens();
1252 }
1253#endif /* AFS */
Tim Rice024acc42001-07-04 21:27:20 -07001254
Damien Miller40eb1d82001-07-14 12:16:59 +10001255 return; /* need statement after label */
Damien Millereba71ba2000-04-29 23:57:08 +10001256}