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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"
Ben Lindstrom6398a0e2002-06-25 23:22:54 +000038RCSID("$OpenBSD: authfd.c,v 1.56 2002/06/25 16:22:42 markus 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 Miller37023962000-07-11 17:31:38 +100056/* helper */
Damien Miller942da032000-08-18 13:59:06 +100057int decode_reply(int type);
Damien Miller37023962000-07-11 17:31:38 +100058
Damien Miller874d77b2000-10-14 16:23:11 +110059/* macro to check for "agent failure" message */
60#define agent_failed(x) \
Ben Lindstromc9a26362001-08-15 23:04:50 +000061 ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE) || \
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000062 (x == SSH2_AGENT_FAILURE))
Damien Miller874d77b2000-10-14 16:23:11 +110063
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064/* Returns the number of the authentication fd, or -1 if there is none. */
65
66int
Ben Lindstrom46c16222000-12-22 01:43:59 +000067ssh_get_authentication_socket(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100068{
Damien Miller95def091999-11-25 00:26:21 +110069 const char *authsocket;
Ben Lindstromb1d822c2001-09-20 01:03:31 +000070 int sock;
Damien Miller95def091999-11-25 00:26:21 +110071 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100072
Damien Miller95def091999-11-25 00:26:21 +110073 authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
74 if (!authsocket)
75 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100076
Damien Miller95def091999-11-25 00:26:21 +110077 sunaddr.sun_family = AF_UNIX;
78 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
Damien Miller10f6f6b1999-11-17 17:29:08 +110079
Damien Miller95def091999-11-25 00:26:21 +110080 sock = socket(AF_UNIX, SOCK_STREAM, 0);
81 if (sock < 0)
82 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100083
Damien Miller95def091999-11-25 00:26:21 +110084 /* close on exec */
85 if (fcntl(sock, F_SETFD, 1) == -1) {
86 close(sock);
87 return -1;
88 }
Ben Lindstromb1d822c2001-09-20 01:03:31 +000089 if (connect(sock, (struct sockaddr *) &sunaddr, sizeof sunaddr) < 0) {
Damien Miller95def091999-11-25 00:26:21 +110090 close(sock);
91 return -1;
92 }
93 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094}
95
Ben Lindstrombba81212001-06-25 05:01:22 +000096static int
Damien Millerad833b32000-08-23 10:46:23 +100097ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply)
Damien Miller942da032000-08-18 13:59:06 +100098{
99 int l, len;
100 char buf[1024];
101
102 /* Get the length of the message, and format it in the buffer. */
103 len = buffer_len(request);
104 PUT_32BIT(buf, len);
105
106 /* Send the length and then the packet to the agent. */
107 if (atomicio(write, auth->fd, buf, 4) != 4 ||
108 atomicio(write, auth->fd, buffer_ptr(request),
109 buffer_len(request)) != buffer_len(request)) {
110 error("Error writing to authentication socket.");
111 return 0;
112 }
113 /*
114 * Wait for response from the agent. First read the length of the
115 * response packet.
116 */
117 len = 4;
118 while (len > 0) {
119 l = read(auth->fd, buf + 4 - len, len);
Ben Lindstromb3144e52001-03-06 03:31:34 +0000120 if (l == -1 && (errno == EAGAIN || errno == EINTR))
Ben Lindstroma3700052001-04-05 23:26:32 +0000121 continue;
Damien Miller942da032000-08-18 13:59:06 +1000122 if (l <= 0) {
123 error("Error reading response length from authentication socket.");
124 return 0;
125 }
126 len -= l;
127 }
128
129 /* Extract the length, and check it for sanity. */
130 len = GET_32BIT(buf);
131 if (len > 256 * 1024)
132 fatal("Authentication response too long: %d", len);
133
134 /* Read the rest of the response in to the buffer. */
135 buffer_clear(reply);
136 while (len > 0) {
137 l = len;
138 if (l > sizeof(buf))
139 l = sizeof(buf);
140 l = read(auth->fd, buf, l);
Ben Lindstromb3144e52001-03-06 03:31:34 +0000141 if (l == -1 && (errno == EAGAIN || errno == EINTR))
Ben Lindstroma3700052001-04-05 23:26:32 +0000142 continue;
Damien Miller942da032000-08-18 13:59:06 +1000143 if (l <= 0) {
144 error("Error reading response from authentication socket.");
145 return 0;
146 }
Ben Lindstrom6398a0e2002-06-25 23:22:54 +0000147 buffer_append(reply, buf, l);
Damien Miller942da032000-08-18 13:59:06 +1000148 len -= l;
149 }
150 return 1;
151}
152
Damien Miller5428f641999-11-25 11:54:57 +1100153/*
154 * Closes the agent socket if it should be closed (depends on how it was
155 * obtained). The argument must have been returned by
156 * ssh_get_authentication_socket().
157 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000158
Damien Miller4af51302000-04-16 11:18:38 +1000159void
Damien Miller95def091999-11-25 00:26:21 +1100160ssh_close_authentication_socket(int sock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000161{
Damien Miller95def091999-11-25 00:26:21 +1100162 if (getenv(SSH_AUTHSOCKET_ENV_NAME))
163 close(sock);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000164}
165
Damien Miller5428f641999-11-25 11:54:57 +1100166/*
167 * Opens and connects a private socket for communication with the
168 * authentication agent. Returns the file descriptor (which must be
169 * shut down and closed by the caller when no longer needed).
170 * Returns NULL if an error occurred and the connection could not be
171 * opened.
172 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000173
Damien Miller95def091999-11-25 00:26:21 +1100174AuthenticationConnection *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000175ssh_get_authentication_connection(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000176{
Damien Miller95def091999-11-25 00:26:21 +1100177 AuthenticationConnection *auth;
178 int sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000179
Damien Miller95def091999-11-25 00:26:21 +1100180 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000181
Damien Miller5428f641999-11-25 11:54:57 +1100182 /*
183 * Fail if we couldn't obtain a connection. This happens if we
184 * exited due to a timeout.
185 */
Damien Miller95def091999-11-25 00:26:21 +1100186 if (sock < 0)
187 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000188
Damien Miller95def091999-11-25 00:26:21 +1100189 auth = xmalloc(sizeof(*auth));
190 auth->fd = sock;
Damien Miller95def091999-11-25 00:26:21 +1100191 buffer_init(&auth->identities);
192 auth->howmany = 0;
193
194 return auth;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195}
196
Damien Miller5428f641999-11-25 11:54:57 +1100197/*
198 * Closes the connection to the authentication agent and frees any associated
199 * memory.
200 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000201
Damien Miller4af51302000-04-16 11:18:38 +1000202void
Damien Millerad833b32000-08-23 10:46:23 +1000203ssh_close_authentication_connection(AuthenticationConnection *auth)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000204{
Damien Millerad833b32000-08-23 10:46:23 +1000205 buffer_free(&auth->identities);
206 close(auth->fd);
207 xfree(auth);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000208}
209
Ben Lindstrom2f717042002-06-06 21:52:03 +0000210/* Lock/unlock agent */
211int
212ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password)
213{
214 int type;
215 Buffer msg;
216
217 buffer_init(&msg);
218 buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK);
219 buffer_put_cstring(&msg, password);
220
221 if (ssh_request_reply(auth, &msg, &msg) == 0) {
222 buffer_free(&msg);
223 return 0;
224 }
225 type = buffer_get_char(&msg);
226 buffer_free(&msg);
227 return decode_reply(type);
228}
229
Damien Miller5428f641999-11-25 11:54:57 +1100230/*
231 * Returns the first authentication identity held by the agent.
Damien Miller5428f641999-11-25 11:54:57 +1100232 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000233
Damien Miller0bc1bd82000-11-13 22:57:25 +1100234int
235ssh_get_num_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000236{
Damien Millerad833b32000-08-23 10:46:23 +1000237 int type, code1 = 0, code2 = 0;
Damien Miller942da032000-08-18 13:59:06 +1000238 Buffer request;
Damien Millerad833b32000-08-23 10:46:23 +1000239
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000240 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000241 case 1:
242 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
243 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
244 break;
245 case 2:
246 code1 = SSH2_AGENTC_REQUEST_IDENTITIES;
247 code2 = SSH2_AGENT_IDENTITIES_ANSWER;
248 break;
249 default:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100250 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000251 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000252
Damien Miller5428f641999-11-25 11:54:57 +1100253 /*
254 * Send a message to the agent requesting for a list of the
255 * identities it can represent.
256 */
Damien Miller942da032000-08-18 13:59:06 +1000257 buffer_init(&request);
Damien Millerad833b32000-08-23 10:46:23 +1000258 buffer_put_char(&request, code1);
Damien Miller942da032000-08-18 13:59:06 +1000259
260 buffer_clear(&auth->identities);
261 if (ssh_request_reply(auth, &request, &auth->identities) == 0) {
262 buffer_free(&request);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100263 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000264 }
Damien Miller942da032000-08-18 13:59:06 +1000265 buffer_free(&request);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000266
Damien Miller95def091999-11-25 00:26:21 +1100267 /* Get message type, and verify that we got a proper answer. */
Damien Miller942da032000-08-18 13:59:06 +1000268 type = buffer_get_char(&auth->identities);
Damien Miller874d77b2000-10-14 16:23:11 +1100269 if (agent_failed(type)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100270 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000271 } else if (type != code2) {
Damien Miller942da032000-08-18 13:59:06 +1000272 fatal("Bad authentication reply message type: %d", type);
Damien Millerad833b32000-08-23 10:46:23 +1000273 }
Damien Miller95def091999-11-25 00:26:21 +1100274
275 /* Get the number of entries in the response and check it for sanity. */
276 auth->howmany = buffer_get_int(&auth->identities);
277 if (auth->howmany > 1024)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000278 fatal("Too many identities in authentication reply: %d",
Damien Miller942da032000-08-18 13:59:06 +1000279 auth->howmany);
Damien Miller95def091999-11-25 00:26:21 +1100280
Damien Miller0bc1bd82000-11-13 22:57:25 +1100281 return auth->howmany;
282}
283
284Key *
285ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version)
286{
287 /* get number of identities and return the first entry (if any). */
288 if (ssh_get_num_identities(auth, version) > 0)
289 return ssh_get_next_identity(auth, comment, version);
290 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000291}
292
Damien Millerad833b32000-08-23 10:46:23 +1000293Key *
294ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000295{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000296 u_int bits;
297 u_char *blob;
298 u_int blen;
Damien Millerad833b32000-08-23 10:46:23 +1000299 Key *key = NULL;
Damien Miller7e8e8201999-11-16 13:37:16 +1100300
Damien Miller95def091999-11-25 00:26:21 +1100301 /* Return failure if no more entries. */
302 if (auth->howmany <= 0)
Damien Millerad833b32000-08-23 10:46:23 +1000303 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000304
Damien Miller5428f641999-11-25 11:54:57 +1100305 /*
306 * Get the next entry from the packet. These will abort with a fatal
307 * error if the packet is too short or contains corrupt data.
308 */
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000309 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000310 case 1:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100311 key = key_new(KEY_RSA1);
Damien Millerad833b32000-08-23 10:46:23 +1000312 bits = buffer_get_int(&auth->identities);
313 buffer_get_bignum(&auth->identities, key->rsa->e);
314 buffer_get_bignum(&auth->identities, key->rsa->n);
315 *comment = buffer_get_string(&auth->identities, NULL);
316 if (bits != BN_num_bits(key->rsa->n))
317 log("Warning: identity keysize mismatch: actual %d, announced %u",
318 BN_num_bits(key->rsa->n), bits);
319 break;
320 case 2:
321 blob = buffer_get_string(&auth->identities, &blen);
322 *comment = buffer_get_string(&auth->identities, NULL);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100323 key = key_from_blob(blob, blen);
Damien Millerad833b32000-08-23 10:46:23 +1000324 xfree(blob);
325 break;
326 default:
327 return NULL;
328 break;
329 }
Damien Miller95def091999-11-25 00:26:21 +1100330 /* Decrement the number of remaining entries. */
331 auth->howmany--;
Damien Millerad833b32000-08-23 10:46:23 +1000332 return key;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000333}
334
Damien Miller5428f641999-11-25 11:54:57 +1100335/*
336 * Generates a random challenge, sends it to the agent, and waits for
337 * response from the agent. Returns true (non-zero) if the agent gave the
338 * correct answer, zero otherwise. Response type selects the style of
339 * response desired, with 0 corresponding to protocol version 1.0 (no longer
340 * supported) and 1 corresponding to protocol version 1.1.
341 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000342
343int
344ssh_decrypt_challenge(AuthenticationConnection *auth,
Damien Millerad833b32000-08-23 10:46:23 +1000345 Key* key, BIGNUM *challenge,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000346 u_char session_id[16],
347 u_int response_type,
348 u_char response[16])
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000349{
Damien Miller95def091999-11-25 00:26:21 +1100350 Buffer buffer;
Damien Miller942da032000-08-18 13:59:06 +1000351 int success = 0;
352 int i;
353 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000354
Damien Miller0bc1bd82000-11-13 22:57:25 +1100355 if (key->type != KEY_RSA1)
Damien Millerad833b32000-08-23 10:46:23 +1000356 return 0;
357 if (response_type == 0) {
358 log("Compatibility with ssh protocol version 1.0 no longer supported.");
359 return 0;
360 }
Damien Miller95def091999-11-25 00:26:21 +1100361 buffer_init(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000362 buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE);
Damien Millerad833b32000-08-23 10:46:23 +1000363 buffer_put_int(&buffer, BN_num_bits(key->rsa->n));
364 buffer_put_bignum(&buffer, key->rsa->e);
365 buffer_put_bignum(&buffer, key->rsa->n);
Damien Miller95def091999-11-25 00:26:21 +1100366 buffer_put_bignum(&buffer, challenge);
Damien Miller4a8ed542002-01-22 23:33:31 +1100367 buffer_append(&buffer, session_id, 16);
Damien Miller95def091999-11-25 00:26:21 +1100368 buffer_put_int(&buffer, response_type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000369
Damien Miller942da032000-08-18 13:59:06 +1000370 if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
Damien Miller95def091999-11-25 00:26:21 +1100371 buffer_free(&buffer);
372 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000373 }
Damien Miller942da032000-08-18 13:59:06 +1000374 type = buffer_get_char(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000375
Damien Miller874d77b2000-10-14 16:23:11 +1100376 if (agent_failed(type)) {
Damien Miller95def091999-11-25 00:26:21 +1100377 log("Agent admitted failure to authenticate using the key.");
Damien Miller942da032000-08-18 13:59:06 +1000378 } else if (type != SSH_AGENT_RSA_RESPONSE) {
379 fatal("Bad authentication response: %d", type);
380 } else {
381 success = 1;
382 /*
383 * Get the response from the packet. This will abort with a
384 * fatal error if the packet is corrupt.
385 */
386 for (i = 0; i < 16; i++)
387 response[i] = buffer_get_char(&buffer);
Damien Miller95def091999-11-25 00:26:21 +1100388 }
Damien Miller95def091999-11-25 00:26:21 +1100389 buffer_free(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000390 return success;
Damien Miller95def091999-11-25 00:26:21 +1100391}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000392
Damien Millerad833b32000-08-23 10:46:23 +1000393/* ask agent to sign data, returns -1 on error, 0 on success */
394int
395ssh_agent_sign(AuthenticationConnection *auth,
396 Key *key,
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000397 u_char **sigp, u_int *lenp,
398 u_char *data, u_int datalen)
Damien Millerad833b32000-08-23 10:46:23 +1000399{
Damien Miller62cee002000-09-23 17:15:56 +1100400 extern int datafellows;
Damien Millerad833b32000-08-23 10:46:23 +1000401 Buffer msg;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000402 u_char *blob;
403 u_int blen;
Damien Miller62cee002000-09-23 17:15:56 +1100404 int type, flags = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000405 int ret = -1;
406
Damien Miller0bc1bd82000-11-13 22:57:25 +1100407 if (key_to_blob(key, &blob, &blen) == 0)
Damien Millerad833b32000-08-23 10:46:23 +1000408 return -1;
409
Damien Miller62cee002000-09-23 17:15:56 +1100410 if (datafellows & SSH_BUG_SIGBLOB)
411 flags = SSH_AGENT_OLD_SIGNATURE;
412
Damien Millerad833b32000-08-23 10:46:23 +1000413 buffer_init(&msg);
414 buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
415 buffer_put_string(&msg, blob, blen);
416 buffer_put_string(&msg, data, datalen);
Damien Miller62cee002000-09-23 17:15:56 +1100417 buffer_put_int(&msg, flags);
Damien Millerad833b32000-08-23 10:46:23 +1000418 xfree(blob);
419
420 if (ssh_request_reply(auth, &msg, &msg) == 0) {
421 buffer_free(&msg);
422 return -1;
423 }
424 type = buffer_get_char(&msg);
Damien Miller874d77b2000-10-14 16:23:11 +1100425 if (agent_failed(type)) {
Damien Millerad833b32000-08-23 10:46:23 +1000426 log("Agent admitted failure to sign using the key.");
427 } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
428 fatal("Bad authentication response: %d", type);
429 } else {
430 ret = 0;
431 *sigp = buffer_get_string(&msg, lenp);
432 }
433 buffer_free(&msg);
434 return ret;
435}
436
Damien Miller994cf142000-07-21 10:19:44 +1000437/* Encode key for a message to the agent. */
438
Ben Lindstrombba81212001-06-25 05:01:22 +0000439static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100440ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000441{
Damien Miller994cf142000-07-21 10:19:44 +1000442 buffer_put_int(b, BN_num_bits(key->n));
443 buffer_put_bignum(b, key->n);
444 buffer_put_bignum(b, key->e);
445 buffer_put_bignum(b, key->d);
446 /* To keep within the protocol: p < q for ssh. in SSL p > q */
447 buffer_put_bignum(b, key->iqmp); /* ssh key->u */
448 buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */
449 buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */
Ben Lindstrom664408d2001-06-09 01:42:01 +0000450 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000451}
452
Ben Lindstrombba81212001-06-25 05:01:22 +0000453static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100454ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000455{
Damien Miller0bc1bd82000-11-13 22:57:25 +1100456 buffer_put_cstring(b, key_ssh_name(key));
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000457 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100458 case KEY_RSA:
459 buffer_put_bignum2(b, key->rsa->n);
460 buffer_put_bignum2(b, key->rsa->e);
461 buffer_put_bignum2(b, key->rsa->d);
462 buffer_put_bignum2(b, key->rsa->iqmp);
463 buffer_put_bignum2(b, key->rsa->p);
464 buffer_put_bignum2(b, key->rsa->q);
465 break;
466 case KEY_DSA:
467 buffer_put_bignum2(b, key->dsa->p);
468 buffer_put_bignum2(b, key->dsa->q);
469 buffer_put_bignum2(b, key->dsa->g);
470 buffer_put_bignum2(b, key->dsa->pub_key);
471 buffer_put_bignum2(b, key->dsa->priv_key);
472 break;
473 }
474 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000475}
476
Damien Miller5428f641999-11-25 11:54:57 +1100477/*
478 * Adds an identity to the authentication server. This call is not meant to
479 * be used by normal applications.
480 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000481
Damien Miller4af51302000-04-16 11:18:38 +1000482int
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000483ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key,
484 const char *comment, u_int life)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000485{
Damien Millerad833b32000-08-23 10:46:23 +1000486 Buffer msg;
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000487 int type, constrained = (life != 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000488
Damien Millerad833b32000-08-23 10:46:23 +1000489 buffer_init(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000490
491 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100492 case KEY_RSA1:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000493 type = constrained ?
494 SSH_AGENTC_ADD_RSA_ID_CONSTRAINED :
495 SSH_AGENTC_ADD_RSA_IDENTITY;
496 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100497 ssh_encode_identity_rsa1(&msg, key->rsa, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000498 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100499 case KEY_RSA:
Damien Miller994cf142000-07-21 10:19:44 +1000500 case KEY_DSA:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000501 type = constrained ?
502 SSH2_AGENTC_ADD_ID_CONSTRAINED :
503 SSH2_AGENTC_ADD_IDENTITY;
504 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100505 ssh_encode_identity_ssh2(&msg, key, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000506 break;
507 default:
Damien Millerad833b32000-08-23 10:46:23 +1000508 buffer_free(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000509 return 0;
510 break;
511 }
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000512 if (constrained) {
513 if (life != 0) {
514 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
515 buffer_put_int(&msg, life);
516 }
517 }
Damien Millerad833b32000-08-23 10:46:23 +1000518 if (ssh_request_reply(auth, &msg, &msg) == 0) {
519 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100520 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000521 }
Damien Millerad833b32000-08-23 10:46:23 +1000522 type = buffer_get_char(&msg);
523 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000524 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100525}
526
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000527int
528ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment)
529{
530 return ssh_add_identity_constrained(auth, key, comment, 0);
531}
532
Damien Miller5428f641999-11-25 11:54:57 +1100533/*
534 * Removes an identity from the authentication server. This call is not
535 * meant to be used by normal applications.
536 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000537
Damien Miller4af51302000-04-16 11:18:38 +1000538int
Damien Millerad833b32000-08-23 10:46:23 +1000539ssh_remove_identity(AuthenticationConnection *auth, Key *key)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000540{
Damien Millerad833b32000-08-23 10:46:23 +1000541 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000542 int type;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000543 u_char *blob;
544 u_int blen;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000545
Damien Millerad833b32000-08-23 10:46:23 +1000546 buffer_init(&msg);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000547
Damien Miller0bc1bd82000-11-13 22:57:25 +1100548 if (key->type == KEY_RSA1) {
Damien Millerad833b32000-08-23 10:46:23 +1000549 buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY);
550 buffer_put_int(&msg, BN_num_bits(key->rsa->n));
551 buffer_put_bignum(&msg, key->rsa->e);
552 buffer_put_bignum(&msg, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100553 } else if (key->type == KEY_DSA || key->type == KEY_RSA) {
554 key_to_blob(key, &blob, &blen);
Damien Millerad833b32000-08-23 10:46:23 +1000555 buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY);
556 buffer_put_string(&msg, blob, blen);
557 xfree(blob);
558 } else {
559 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100560 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000561 }
Damien Millerad833b32000-08-23 10:46:23 +1000562 if (ssh_request_reply(auth, &msg, &msg) == 0) {
563 buffer_free(&msg);
564 return 0;
565 }
566 type = buffer_get_char(&msg);
567 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000568 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100569}
570
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000571int
Ben Lindstromba72d302002-03-22 03:51:06 +0000572ssh_update_card(AuthenticationConnection *auth, int add, const char *reader_id, const char *pin)
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000573{
574 Buffer msg;
575 int type;
576
577 buffer_init(&msg);
578 buffer_put_char(&msg, add ? SSH_AGENTC_ADD_SMARTCARD_KEY :
579 SSH_AGENTC_REMOVE_SMARTCARD_KEY);
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000580 buffer_put_cstring(&msg, reader_id);
Ben Lindstromba72d302002-03-22 03:51:06 +0000581 buffer_put_cstring(&msg, pin);
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000582 if (ssh_request_reply(auth, &msg, &msg) == 0) {
583 buffer_free(&msg);
584 return 0;
585 }
586 type = buffer_get_char(&msg);
587 buffer_free(&msg);
588 return decode_reply(type);
589}
590
Damien Miller5428f641999-11-25 11:54:57 +1100591/*
592 * Removes all identities from the agent. This call is not meant to be used
593 * by normal applications.
594 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000595
Damien Miller4af51302000-04-16 11:18:38 +1000596int
Damien Millerad833b32000-08-23 10:46:23 +1000597ssh_remove_all_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000598{
Damien Millerad833b32000-08-23 10:46:23 +1000599 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000600 int type;
Damien Millerad833b32000-08-23 10:46:23 +1000601 int code = (version==1) ?
602 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
603 SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000604
Damien Millerad833b32000-08-23 10:46:23 +1000605 buffer_init(&msg);
606 buffer_put_char(&msg, code);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000607
Damien Millerad833b32000-08-23 10:46:23 +1000608 if (ssh_request_reply(auth, &msg, &msg) == 0) {
609 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100610 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000611 }
Damien Millerad833b32000-08-23 10:46:23 +1000612 type = buffer_get_char(&msg);
613 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000614 return decode_reply(type);
615}
616
Kevin Stevesef4eea92001-02-05 12:42:17 +0000617int
Damien Miller942da032000-08-18 13:59:06 +1000618decode_reply(int type)
619{
Damien Miller95def091999-11-25 00:26:21 +1100620 switch (type) {
621 case SSH_AGENT_FAILURE:
Damien Miller874d77b2000-10-14 16:23:11 +1100622 case SSH_COM_AGENT2_FAILURE:
Ben Lindstromc9a26362001-08-15 23:04:50 +0000623 case SSH2_AGENT_FAILURE:
Damien Miller942da032000-08-18 13:59:06 +1000624 log("SSH_AGENT_FAILURE");
Damien Miller95def091999-11-25 00:26:21 +1100625 return 0;
626 case SSH_AGENT_SUCCESS:
Damien Miller95def091999-11-25 00:26:21 +1100627 return 1;
628 default:
Damien Miller37023962000-07-11 17:31:38 +1000629 fatal("Bad response from authentication agent: %d", type);
Damien Miller95def091999-11-25 00:26:21 +1100630 }
631 /* NOTREACHED */
632 return 0;
633}