blob: 42ca08256d24bb75773b6b68dd18d409ccbf626b [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * Functions for connecting the local authentication agent.
Damien Miller4af51302000-04-16 11:18:38 +10006 *
Damien Millere4340be2000-09-16 13:29:08 +11007 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose. Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
Damien Millerad833b32000-08-23 10:46:23 +100012 *
Damien Millere4340be2000-09-16 13:29:08 +110013 * SSH2 implementation,
14 * Copyright (c) 2000 Markus Friedl. All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110035 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100036
37#include "includes.h"
Damien Millera8e06ce2003-11-21 23:48:55 +110038RCSID("$OpenBSD: authfd.c,v 1.63 2003/11/21 11:57:03 djm Exp $");
Ben Lindstrom226cfa02001-01-22 05:34:40 +000039
40#include <openssl/evp.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "ssh.h"
43#include "rsa.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100044#include "buffer.h"
45#include "bufaux.h"
46#include "xmalloc.h"
47#include "getput.h"
Damien Miller994cf142000-07-21 10:19:44 +100048#include "key.h"
49#include "authfd.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000050#include "cipher.h"
Damien Miller994cf142000-07-21 10:19:44 +100051#include "kex.h"
Damien Miller62cee002000-09-23 17:15:56 +110052#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000053#include "log.h"
54#include "atomicio.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100055
Damien Miller789e95d2002-09-12 09:52:46 +100056static int agent_present = 0;
57
Damien Miller37023962000-07-11 17:31:38 +100058/* helper */
Damien Miller942da032000-08-18 13:59:06 +100059int decode_reply(int type);
Damien Miller37023962000-07-11 17:31:38 +100060
Damien Miller874d77b2000-10-14 16:23:11 +110061/* macro to check for "agent failure" message */
62#define agent_failed(x) \
Ben Lindstromc9a26362001-08-15 23:04:50 +000063 ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE) || \
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000064 (x == SSH2_AGENT_FAILURE))
Damien Miller874d77b2000-10-14 16:23:11 +110065
Damien Miller789e95d2002-09-12 09:52:46 +100066int
67ssh_agent_present(void)
68{
69 int authfd;
70
71 if (agent_present)
72 return 1;
73 if ((authfd = ssh_get_authentication_socket()) == -1)
74 return 0;
75 else {
76 ssh_close_authentication_socket(authfd);
77 return 1;
78 }
79}
80
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081/* Returns the number of the authentication fd, or -1 if there is none. */
82
83int
Ben Lindstrom46c16222000-12-22 01:43:59 +000084ssh_get_authentication_socket(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100085{
Damien Miller95def091999-11-25 00:26:21 +110086 const char *authsocket;
Ben Lindstromb1d822c2001-09-20 01:03:31 +000087 int sock;
Damien Miller95def091999-11-25 00:26:21 +110088 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100089
Damien Miller95def091999-11-25 00:26:21 +110090 authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
91 if (!authsocket)
92 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100093
Damien Miller95def091999-11-25 00:26:21 +110094 sunaddr.sun_family = AF_UNIX;
95 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
Damien Miller10f6f6b1999-11-17 17:29:08 +110096
Damien Miller95def091999-11-25 00:26:21 +110097 sock = socket(AF_UNIX, SOCK_STREAM, 0);
98 if (sock < 0)
99 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100
Damien Miller95def091999-11-25 00:26:21 +1100101 /* close on exec */
102 if (fcntl(sock, F_SETFD, 1) == -1) {
103 close(sock);
104 return -1;
105 }
Ben Lindstromb1d822c2001-09-20 01:03:31 +0000106 if (connect(sock, (struct sockaddr *) &sunaddr, sizeof sunaddr) < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100107 close(sock);
108 return -1;
109 }
Damien Miller789e95d2002-09-12 09:52:46 +1000110 agent_present = 1;
Damien Miller95def091999-11-25 00:26:21 +1100111 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000112}
113
Ben Lindstrombba81212001-06-25 05:01:22 +0000114static int
Damien Millerad833b32000-08-23 10:46:23 +1000115ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply)
Damien Miller942da032000-08-18 13:59:06 +1000116{
Darren Tuckerc0815c92003-09-22 21:05:50 +1000117 int l;
118 u_int len;
Damien Miller942da032000-08-18 13:59:06 +1000119 char buf[1024];
120
121 /* Get the length of the message, and format it in the buffer. */
122 len = buffer_len(request);
123 PUT_32BIT(buf, len);
124
125 /* Send the length and then the packet to the agent. */
Darren Tucker9f63f222003-07-03 13:46:56 +1000126 if (atomicio(vwrite, auth->fd, buf, 4) != 4 ||
127 atomicio(vwrite, auth->fd, buffer_ptr(request),
Damien Miller942da032000-08-18 13:59:06 +1000128 buffer_len(request)) != buffer_len(request)) {
129 error("Error writing to authentication socket.");
130 return 0;
131 }
132 /*
133 * Wait for response from the agent. First read the length of the
134 * response packet.
135 */
136 len = 4;
137 while (len > 0) {
138 l = read(auth->fd, buf + 4 - len, len);
Ben Lindstromb3144e52001-03-06 03:31:34 +0000139 if (l == -1 && (errno == EAGAIN || errno == EINTR))
Ben Lindstroma3700052001-04-05 23:26:32 +0000140 continue;
Damien Miller942da032000-08-18 13:59:06 +1000141 if (l <= 0) {
142 error("Error reading response length from authentication socket.");
143 return 0;
144 }
145 len -= l;
146 }
147
148 /* Extract the length, and check it for sanity. */
149 len = GET_32BIT(buf);
150 if (len > 256 * 1024)
Darren Tuckerc0815c92003-09-22 21:05:50 +1000151 fatal("Authentication response too long: %u", len);
Damien Miller942da032000-08-18 13:59:06 +1000152
153 /* Read the rest of the response in to the buffer. */
154 buffer_clear(reply);
155 while (len > 0) {
156 l = len;
157 if (l > sizeof(buf))
158 l = sizeof(buf);
159 l = read(auth->fd, buf, l);
Ben Lindstromb3144e52001-03-06 03:31:34 +0000160 if (l == -1 && (errno == EAGAIN || errno == EINTR))
Ben Lindstroma3700052001-04-05 23:26:32 +0000161 continue;
Damien Miller942da032000-08-18 13:59:06 +1000162 if (l <= 0) {
163 error("Error reading response from authentication socket.");
164 return 0;
165 }
Ben Lindstrom6398a0e2002-06-25 23:22:54 +0000166 buffer_append(reply, buf, l);
Damien Miller942da032000-08-18 13:59:06 +1000167 len -= l;
168 }
169 return 1;
170}
171
Damien Miller5428f641999-11-25 11:54:57 +1100172/*
173 * Closes the agent socket if it should be closed (depends on how it was
174 * obtained). The argument must have been returned by
175 * ssh_get_authentication_socket().
176 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000177
Damien Miller4af51302000-04-16 11:18:38 +1000178void
Damien Miller95def091999-11-25 00:26:21 +1100179ssh_close_authentication_socket(int sock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000180{
Damien Miller95def091999-11-25 00:26:21 +1100181 if (getenv(SSH_AUTHSOCKET_ENV_NAME))
182 close(sock);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000183}
184
Damien Miller5428f641999-11-25 11:54:57 +1100185/*
186 * Opens and connects a private socket for communication with the
187 * authentication agent. Returns the file descriptor (which must be
188 * shut down and closed by the caller when no longer needed).
189 * Returns NULL if an error occurred and the connection could not be
190 * opened.
191 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000192
Damien Miller95def091999-11-25 00:26:21 +1100193AuthenticationConnection *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000194ssh_get_authentication_connection(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195{
Damien Miller95def091999-11-25 00:26:21 +1100196 AuthenticationConnection *auth;
197 int sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000198
Damien Miller95def091999-11-25 00:26:21 +1100199 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000200
Damien Miller5428f641999-11-25 11:54:57 +1100201 /*
202 * Fail if we couldn't obtain a connection. This happens if we
203 * exited due to a timeout.
204 */
Damien Miller95def091999-11-25 00:26:21 +1100205 if (sock < 0)
206 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000207
Damien Miller95def091999-11-25 00:26:21 +1100208 auth = xmalloc(sizeof(*auth));
209 auth->fd = sock;
Damien Miller95def091999-11-25 00:26:21 +1100210 buffer_init(&auth->identities);
211 auth->howmany = 0;
212
213 return auth;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000214}
215
Damien Miller5428f641999-11-25 11:54:57 +1100216/*
217 * Closes the connection to the authentication agent and frees any associated
218 * memory.
219 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000220
Damien Miller4af51302000-04-16 11:18:38 +1000221void
Damien Millerad833b32000-08-23 10:46:23 +1000222ssh_close_authentication_connection(AuthenticationConnection *auth)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000223{
Damien Millerad833b32000-08-23 10:46:23 +1000224 buffer_free(&auth->identities);
225 close(auth->fd);
226 xfree(auth);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000227}
228
Ben Lindstrom2f717042002-06-06 21:52:03 +0000229/* Lock/unlock agent */
230int
231ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password)
232{
233 int type;
234 Buffer msg;
235
236 buffer_init(&msg);
237 buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK);
238 buffer_put_cstring(&msg, password);
239
240 if (ssh_request_reply(auth, &msg, &msg) == 0) {
241 buffer_free(&msg);
242 return 0;
243 }
244 type = buffer_get_char(&msg);
245 buffer_free(&msg);
246 return decode_reply(type);
247}
248
Damien Miller5428f641999-11-25 11:54:57 +1100249/*
250 * Returns the first authentication identity held by the agent.
Damien Miller5428f641999-11-25 11:54:57 +1100251 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000252
Damien Miller0bc1bd82000-11-13 22:57:25 +1100253int
254ssh_get_num_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000255{
Damien Millerad833b32000-08-23 10:46:23 +1000256 int type, code1 = 0, code2 = 0;
Damien Miller942da032000-08-18 13:59:06 +1000257 Buffer request;
Damien Millerad833b32000-08-23 10:46:23 +1000258
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000259 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000260 case 1:
261 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
262 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
263 break;
264 case 2:
265 code1 = SSH2_AGENTC_REQUEST_IDENTITIES;
266 code2 = SSH2_AGENT_IDENTITIES_ANSWER;
267 break;
268 default:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100269 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000270 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000271
Damien Miller5428f641999-11-25 11:54:57 +1100272 /*
273 * Send a message to the agent requesting for a list of the
274 * identities it can represent.
275 */
Damien Miller942da032000-08-18 13:59:06 +1000276 buffer_init(&request);
Damien Millerad833b32000-08-23 10:46:23 +1000277 buffer_put_char(&request, code1);
Damien Miller942da032000-08-18 13:59:06 +1000278
279 buffer_clear(&auth->identities);
280 if (ssh_request_reply(auth, &request, &auth->identities) == 0) {
281 buffer_free(&request);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100282 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000283 }
Damien Miller942da032000-08-18 13:59:06 +1000284 buffer_free(&request);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000285
Damien Miller95def091999-11-25 00:26:21 +1100286 /* Get message type, and verify that we got a proper answer. */
Damien Miller942da032000-08-18 13:59:06 +1000287 type = buffer_get_char(&auth->identities);
Damien Miller874d77b2000-10-14 16:23:11 +1100288 if (agent_failed(type)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100289 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000290 } else if (type != code2) {
Damien Miller942da032000-08-18 13:59:06 +1000291 fatal("Bad authentication reply message type: %d", type);
Damien Millerad833b32000-08-23 10:46:23 +1000292 }
Damien Miller95def091999-11-25 00:26:21 +1100293
294 /* Get the number of entries in the response and check it for sanity. */
295 auth->howmany = buffer_get_int(&auth->identities);
Darren Tuckerc0815c92003-09-22 21:05:50 +1000296 if ((u_int)auth->howmany > 1024)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000297 fatal("Too many identities in authentication reply: %d",
Damien Miller942da032000-08-18 13:59:06 +1000298 auth->howmany);
Damien Miller95def091999-11-25 00:26:21 +1100299
Damien Miller0bc1bd82000-11-13 22:57:25 +1100300 return auth->howmany;
301}
302
303Key *
304ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version)
305{
306 /* get number of identities and return the first entry (if any). */
307 if (ssh_get_num_identities(auth, version) > 0)
308 return ssh_get_next_identity(auth, comment, version);
309 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000310}
311
Damien Millerad833b32000-08-23 10:46:23 +1000312Key *
313ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000314{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000315 u_int bits;
316 u_char *blob;
317 u_int blen;
Damien Millerad833b32000-08-23 10:46:23 +1000318 Key *key = NULL;
Damien Miller7e8e8201999-11-16 13:37:16 +1100319
Damien Miller95def091999-11-25 00:26:21 +1100320 /* Return failure if no more entries. */
321 if (auth->howmany <= 0)
Damien Millerad833b32000-08-23 10:46:23 +1000322 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000323
Damien Miller5428f641999-11-25 11:54:57 +1100324 /*
325 * Get the next entry from the packet. These will abort with a fatal
326 * error if the packet is too short or contains corrupt data.
327 */
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000328 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000329 case 1:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100330 key = key_new(KEY_RSA1);
Damien Millerad833b32000-08-23 10:46:23 +1000331 bits = buffer_get_int(&auth->identities);
332 buffer_get_bignum(&auth->identities, key->rsa->e);
333 buffer_get_bignum(&auth->identities, key->rsa->n);
334 *comment = buffer_get_string(&auth->identities, NULL);
335 if (bits != BN_num_bits(key->rsa->n))
Damien Miller996acd22003-04-09 20:59:48 +1000336 logit("Warning: identity keysize mismatch: actual %d, announced %u",
Damien Millerad833b32000-08-23 10:46:23 +1000337 BN_num_bits(key->rsa->n), bits);
338 break;
339 case 2:
340 blob = buffer_get_string(&auth->identities, &blen);
341 *comment = buffer_get_string(&auth->identities, NULL);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100342 key = key_from_blob(blob, blen);
Damien Millerad833b32000-08-23 10:46:23 +1000343 xfree(blob);
344 break;
345 default:
346 return NULL;
347 break;
348 }
Damien Miller95def091999-11-25 00:26:21 +1100349 /* Decrement the number of remaining entries. */
350 auth->howmany--;
Damien Millerad833b32000-08-23 10:46:23 +1000351 return key;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000352}
353
Damien Miller5428f641999-11-25 11:54:57 +1100354/*
355 * Generates a random challenge, sends it to the agent, and waits for
356 * response from the agent. Returns true (non-zero) if the agent gave the
357 * correct answer, zero otherwise. Response type selects the style of
358 * response desired, with 0 corresponding to protocol version 1.0 (no longer
359 * supported) and 1 corresponding to protocol version 1.1.
360 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000361
362int
363ssh_decrypt_challenge(AuthenticationConnection *auth,
Damien Millerad833b32000-08-23 10:46:23 +1000364 Key* key, BIGNUM *challenge,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000365 u_char session_id[16],
366 u_int response_type,
367 u_char response[16])
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000368{
Damien Miller95def091999-11-25 00:26:21 +1100369 Buffer buffer;
Damien Miller942da032000-08-18 13:59:06 +1000370 int success = 0;
371 int i;
372 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000373
Damien Miller0bc1bd82000-11-13 22:57:25 +1100374 if (key->type != KEY_RSA1)
Damien Millerad833b32000-08-23 10:46:23 +1000375 return 0;
376 if (response_type == 0) {
Damien Miller996acd22003-04-09 20:59:48 +1000377 logit("Compatibility with ssh protocol version 1.0 no longer supported.");
Damien Millerad833b32000-08-23 10:46:23 +1000378 return 0;
379 }
Damien Miller95def091999-11-25 00:26:21 +1100380 buffer_init(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000381 buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE);
Damien Millerad833b32000-08-23 10:46:23 +1000382 buffer_put_int(&buffer, BN_num_bits(key->rsa->n));
383 buffer_put_bignum(&buffer, key->rsa->e);
384 buffer_put_bignum(&buffer, key->rsa->n);
Damien Miller95def091999-11-25 00:26:21 +1100385 buffer_put_bignum(&buffer, challenge);
Damien Miller4a8ed542002-01-22 23:33:31 +1100386 buffer_append(&buffer, session_id, 16);
Damien Miller95def091999-11-25 00:26:21 +1100387 buffer_put_int(&buffer, response_type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000388
Damien Miller942da032000-08-18 13:59:06 +1000389 if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
Damien Miller95def091999-11-25 00:26:21 +1100390 buffer_free(&buffer);
391 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000392 }
Damien Miller942da032000-08-18 13:59:06 +1000393 type = buffer_get_char(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000394
Damien Miller874d77b2000-10-14 16:23:11 +1100395 if (agent_failed(type)) {
Damien Miller996acd22003-04-09 20:59:48 +1000396 logit("Agent admitted failure to authenticate using the key.");
Damien Miller942da032000-08-18 13:59:06 +1000397 } else if (type != SSH_AGENT_RSA_RESPONSE) {
398 fatal("Bad authentication response: %d", type);
399 } else {
400 success = 1;
401 /*
402 * Get the response from the packet. This will abort with a
403 * fatal error if the packet is corrupt.
404 */
405 for (i = 0; i < 16; i++)
406 response[i] = buffer_get_char(&buffer);
Damien Miller95def091999-11-25 00:26:21 +1100407 }
Damien Miller95def091999-11-25 00:26:21 +1100408 buffer_free(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000409 return success;
Damien Miller95def091999-11-25 00:26:21 +1100410}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000411
Damien Millerad833b32000-08-23 10:46:23 +1000412/* ask agent to sign data, returns -1 on error, 0 on success */
413int
414ssh_agent_sign(AuthenticationConnection *auth,
415 Key *key,
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000416 u_char **sigp, u_int *lenp,
417 u_char *data, u_int datalen)
Damien Millerad833b32000-08-23 10:46:23 +1000418{
Damien Miller62cee002000-09-23 17:15:56 +1100419 extern int datafellows;
Damien Millerad833b32000-08-23 10:46:23 +1000420 Buffer msg;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000421 u_char *blob;
422 u_int blen;
Damien Miller62cee002000-09-23 17:15:56 +1100423 int type, flags = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000424 int ret = -1;
425
Damien Miller0bc1bd82000-11-13 22:57:25 +1100426 if (key_to_blob(key, &blob, &blen) == 0)
Damien Millerad833b32000-08-23 10:46:23 +1000427 return -1;
428
Damien Miller62cee002000-09-23 17:15:56 +1100429 if (datafellows & SSH_BUG_SIGBLOB)
430 flags = SSH_AGENT_OLD_SIGNATURE;
431
Damien Millerad833b32000-08-23 10:46:23 +1000432 buffer_init(&msg);
433 buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
434 buffer_put_string(&msg, blob, blen);
435 buffer_put_string(&msg, data, datalen);
Damien Miller62cee002000-09-23 17:15:56 +1100436 buffer_put_int(&msg, flags);
Damien Millerad833b32000-08-23 10:46:23 +1000437 xfree(blob);
438
439 if (ssh_request_reply(auth, &msg, &msg) == 0) {
440 buffer_free(&msg);
441 return -1;
442 }
443 type = buffer_get_char(&msg);
Damien Miller874d77b2000-10-14 16:23:11 +1100444 if (agent_failed(type)) {
Damien Miller996acd22003-04-09 20:59:48 +1000445 logit("Agent admitted failure to sign using the key.");
Damien Millerad833b32000-08-23 10:46:23 +1000446 } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
447 fatal("Bad authentication response: %d", type);
448 } else {
449 ret = 0;
450 *sigp = buffer_get_string(&msg, lenp);
451 }
452 buffer_free(&msg);
453 return ret;
454}
455
Damien Miller994cf142000-07-21 10:19:44 +1000456/* Encode key for a message to the agent. */
457
Ben Lindstrombba81212001-06-25 05:01:22 +0000458static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100459ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000460{
Damien Miller994cf142000-07-21 10:19:44 +1000461 buffer_put_int(b, BN_num_bits(key->n));
462 buffer_put_bignum(b, key->n);
463 buffer_put_bignum(b, key->e);
464 buffer_put_bignum(b, key->d);
465 /* To keep within the protocol: p < q for ssh. in SSL p > q */
466 buffer_put_bignum(b, key->iqmp); /* ssh key->u */
467 buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */
468 buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */
Ben Lindstrom664408d2001-06-09 01:42:01 +0000469 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000470}
471
Ben Lindstrombba81212001-06-25 05:01:22 +0000472static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100473ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000474{
Damien Miller0bc1bd82000-11-13 22:57:25 +1100475 buffer_put_cstring(b, key_ssh_name(key));
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000476 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100477 case KEY_RSA:
478 buffer_put_bignum2(b, key->rsa->n);
479 buffer_put_bignum2(b, key->rsa->e);
480 buffer_put_bignum2(b, key->rsa->d);
481 buffer_put_bignum2(b, key->rsa->iqmp);
482 buffer_put_bignum2(b, key->rsa->p);
483 buffer_put_bignum2(b, key->rsa->q);
484 break;
485 case KEY_DSA:
486 buffer_put_bignum2(b, key->dsa->p);
487 buffer_put_bignum2(b, key->dsa->q);
488 buffer_put_bignum2(b, key->dsa->g);
489 buffer_put_bignum2(b, key->dsa->pub_key);
490 buffer_put_bignum2(b, key->dsa->priv_key);
491 break;
492 }
493 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000494}
495
Damien Miller5428f641999-11-25 11:54:57 +1100496/*
497 * Adds an identity to the authentication server. This call is not meant to
498 * be used by normal applications.
499 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000500
Damien Miller4af51302000-04-16 11:18:38 +1000501int
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000502ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key,
Damien Miller6c711792003-01-24 11:36:23 +1100503 const char *comment, u_int life, u_int confirm)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000504{
Damien Millerad833b32000-08-23 10:46:23 +1000505 Buffer msg;
Damien Miller6c711792003-01-24 11:36:23 +1100506 int type, constrained = (life || confirm);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000507
Damien Millerad833b32000-08-23 10:46:23 +1000508 buffer_init(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000509
510 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100511 case KEY_RSA1:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000512 type = constrained ?
513 SSH_AGENTC_ADD_RSA_ID_CONSTRAINED :
514 SSH_AGENTC_ADD_RSA_IDENTITY;
515 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100516 ssh_encode_identity_rsa1(&msg, key->rsa, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000517 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100518 case KEY_RSA:
Damien Miller994cf142000-07-21 10:19:44 +1000519 case KEY_DSA:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000520 type = constrained ?
521 SSH2_AGENTC_ADD_ID_CONSTRAINED :
522 SSH2_AGENTC_ADD_IDENTITY;
523 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100524 ssh_encode_identity_ssh2(&msg, key, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000525 break;
526 default:
Damien Millerad833b32000-08-23 10:46:23 +1000527 buffer_free(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000528 return 0;
529 break;
530 }
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000531 if (constrained) {
532 if (life != 0) {
533 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
534 buffer_put_int(&msg, life);
535 }
Damien Miller6c711792003-01-24 11:36:23 +1100536 if (confirm != 0)
537 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000538 }
Damien Millerad833b32000-08-23 10:46:23 +1000539 if (ssh_request_reply(auth, &msg, &msg) == 0) {
540 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100541 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000542 }
Damien Millerad833b32000-08-23 10:46:23 +1000543 type = buffer_get_char(&msg);
544 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000545 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100546}
547
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000548int
549ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment)
550{
Damien Miller6c711792003-01-24 11:36:23 +1100551 return ssh_add_identity_constrained(auth, key, comment, 0, 0);
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000552}
553
Damien Miller5428f641999-11-25 11:54:57 +1100554/*
555 * Removes an identity from the authentication server. This call is not
556 * meant to be used by normal applications.
557 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000558
Damien Miller4af51302000-04-16 11:18:38 +1000559int
Damien Millerad833b32000-08-23 10:46:23 +1000560ssh_remove_identity(AuthenticationConnection *auth, Key *key)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000561{
Damien Millerad833b32000-08-23 10:46:23 +1000562 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000563 int type;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000564 u_char *blob;
565 u_int blen;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000566
Damien Millerad833b32000-08-23 10:46:23 +1000567 buffer_init(&msg);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000568
Damien Miller0bc1bd82000-11-13 22:57:25 +1100569 if (key->type == KEY_RSA1) {
Damien Millerad833b32000-08-23 10:46:23 +1000570 buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY);
571 buffer_put_int(&msg, BN_num_bits(key->rsa->n));
572 buffer_put_bignum(&msg, key->rsa->e);
573 buffer_put_bignum(&msg, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100574 } else if (key->type == KEY_DSA || key->type == KEY_RSA) {
575 key_to_blob(key, &blob, &blen);
Damien Millerad833b32000-08-23 10:46:23 +1000576 buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY);
577 buffer_put_string(&msg, blob, blen);
578 xfree(blob);
579 } else {
580 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100581 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000582 }
Damien Millerad833b32000-08-23 10:46:23 +1000583 if (ssh_request_reply(auth, &msg, &msg) == 0) {
584 buffer_free(&msg);
585 return 0;
586 }
587 type = buffer_get_char(&msg);
588 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000589 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100590}
591
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000592int
Damien Millera8e06ce2003-11-21 23:48:55 +1100593ssh_update_card(AuthenticationConnection *auth, int add,
Damien Millerd94f20d2003-06-11 22:06:33 +1000594 const char *reader_id, const char *pin, u_int life, u_int confirm)
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000595{
596 Buffer msg;
Damien Millerd94f20d2003-06-11 22:06:33 +1000597 int type, constrained = (life || confirm);
598
599 if (add) {
600 type = constrained ?
601 SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
602 SSH_AGENTC_ADD_SMARTCARD_KEY;
603 } else
604 type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000605
606 buffer_init(&msg);
Damien Millerd94f20d2003-06-11 22:06:33 +1000607 buffer_put_char(&msg, type);
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000608 buffer_put_cstring(&msg, reader_id);
Ben Lindstromba72d302002-03-22 03:51:06 +0000609 buffer_put_cstring(&msg, pin);
Damien Miller787b2ec2003-11-21 23:56:47 +1100610
Damien Millerd94f20d2003-06-11 22:06:33 +1000611 if (constrained) {
612 if (life != 0) {
613 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
614 buffer_put_int(&msg, life);
615 }
616 if (confirm != 0)
617 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
618 }
619
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000620 if (ssh_request_reply(auth, &msg, &msg) == 0) {
621 buffer_free(&msg);
622 return 0;
623 }
624 type = buffer_get_char(&msg);
625 buffer_free(&msg);
626 return decode_reply(type);
627}
628
Damien Miller5428f641999-11-25 11:54:57 +1100629/*
630 * Removes all identities from the agent. This call is not meant to be used
631 * by normal applications.
632 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000633
Damien Miller4af51302000-04-16 11:18:38 +1000634int
Damien Millerad833b32000-08-23 10:46:23 +1000635ssh_remove_all_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000636{
Damien Millerad833b32000-08-23 10:46:23 +1000637 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000638 int type;
Damien Millerad833b32000-08-23 10:46:23 +1000639 int code = (version==1) ?
640 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
641 SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000642
Damien Millerad833b32000-08-23 10:46:23 +1000643 buffer_init(&msg);
644 buffer_put_char(&msg, code);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000645
Damien Millerad833b32000-08-23 10:46:23 +1000646 if (ssh_request_reply(auth, &msg, &msg) == 0) {
647 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100648 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000649 }
Damien Millerad833b32000-08-23 10:46:23 +1000650 type = buffer_get_char(&msg);
651 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000652 return decode_reply(type);
653}
654
Kevin Stevesef4eea92001-02-05 12:42:17 +0000655int
Damien Miller942da032000-08-18 13:59:06 +1000656decode_reply(int type)
657{
Damien Miller95def091999-11-25 00:26:21 +1100658 switch (type) {
659 case SSH_AGENT_FAILURE:
Damien Miller874d77b2000-10-14 16:23:11 +1100660 case SSH_COM_AGENT2_FAILURE:
Ben Lindstromc9a26362001-08-15 23:04:50 +0000661 case SSH2_AGENT_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +1000662 logit("SSH_AGENT_FAILURE");
Damien Miller95def091999-11-25 00:26:21 +1100663 return 0;
664 case SSH_AGENT_SUCCESS:
Damien Miller95def091999-11-25 00:26:21 +1100665 return 1;
666 default:
Damien Miller37023962000-07-11 17:31:38 +1000667 fatal("Bad response from authentication agent: %d", type);
Damien Miller95def091999-11-25 00:26:21 +1100668 }
669 /* NOTREACHED */
670 return 0;
671}