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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 Lindstrom036a6b22001-07-04 03:50:02 +000038RCSID("$OpenBSD: authfd.c,v 1.42 2001/06/26 04:59:59 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) \
61 ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE))
62
Damien Millerd4a8b7e1999-10-27 13:42:43 +100063/* Returns the number of the authentication fd, or -1 if there is none. */
64
65int
Ben Lindstrom46c16222000-12-22 01:43:59 +000066ssh_get_authentication_socket(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100067{
Damien Miller95def091999-11-25 00:26:21 +110068 const char *authsocket;
Damien Miller942da032000-08-18 13:59:06 +100069 int sock, len;
Damien Miller95def091999-11-25 00:26:21 +110070 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100071
Damien Miller95def091999-11-25 00:26:21 +110072 authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
73 if (!authsocket)
74 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075
Damien Miller95def091999-11-25 00:26:21 +110076 sunaddr.sun_family = AF_UNIX;
77 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
Damien Miller942da032000-08-18 13:59:06 +100078 len = SUN_LEN(&sunaddr)+1;
Ben Lindstromafd34752001-03-05 06:33:23 +000079#ifdef HAVE_SUN_LEN_IN_SOCKADDR_UN
80 sunaddr.sun_len = len;
Damien Miller942da032000-08-18 13:59:06 +100081#endif /* HAVE_SUN_LEN_IN_SOCKADDR_UN */
Damien Miller10f6f6b1999-11-17 17:29:08 +110082
Damien Miller95def091999-11-25 00:26:21 +110083 sock = socket(AF_UNIX, SOCK_STREAM, 0);
84 if (sock < 0)
85 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086
Damien Miller95def091999-11-25 00:26:21 +110087 /* close on exec */
88 if (fcntl(sock, F_SETFD, 1) == -1) {
89 close(sock);
90 return -1;
91 }
Damien Miller942da032000-08-18 13:59:06 +100092 if (connect(sock, (struct sockaddr *) & sunaddr, len) < 0) {
Damien Miller95def091999-11-25 00:26:21 +110093 close(sock);
94 return -1;
95 }
96 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100097}
98
Ben Lindstrombba81212001-06-25 05:01:22 +000099static int
Damien Millerad833b32000-08-23 10:46:23 +1000100ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply)
Damien Miller942da032000-08-18 13:59:06 +1000101{
102 int l, len;
103 char buf[1024];
104
105 /* Get the length of the message, and format it in the buffer. */
106 len = buffer_len(request);
107 PUT_32BIT(buf, len);
108
109 /* Send the length and then the packet to the agent. */
110 if (atomicio(write, auth->fd, buf, 4) != 4 ||
111 atomicio(write, auth->fd, buffer_ptr(request),
112 buffer_len(request)) != buffer_len(request)) {
113 error("Error writing to authentication socket.");
114 return 0;
115 }
116 /*
117 * Wait for response from the agent. First read the length of the
118 * response packet.
119 */
120 len = 4;
121 while (len > 0) {
122 l = read(auth->fd, buf + 4 - len, len);
Ben Lindstromb3144e52001-03-06 03:31:34 +0000123 if (l == -1 && (errno == EAGAIN || errno == EINTR))
Ben Lindstroma3700052001-04-05 23:26:32 +0000124 continue;
Damien Miller942da032000-08-18 13:59:06 +1000125 if (l <= 0) {
126 error("Error reading response length from authentication socket.");
127 return 0;
128 }
129 len -= l;
130 }
131
132 /* Extract the length, and check it for sanity. */
133 len = GET_32BIT(buf);
134 if (len > 256 * 1024)
135 fatal("Authentication response too long: %d", len);
136
137 /* Read the rest of the response in to the buffer. */
138 buffer_clear(reply);
139 while (len > 0) {
140 l = len;
141 if (l > sizeof(buf))
142 l = sizeof(buf);
143 l = read(auth->fd, buf, l);
Ben Lindstromb3144e52001-03-06 03:31:34 +0000144 if (l == -1 && (errno == EAGAIN || errno == EINTR))
Ben Lindstroma3700052001-04-05 23:26:32 +0000145 continue;
Damien Miller942da032000-08-18 13:59:06 +1000146 if (l <= 0) {
147 error("Error reading response from authentication socket.");
148 return 0;
149 }
150 buffer_append(reply, (char *) buf, l);
151 len -= l;
152 }
153 return 1;
154}
155
Damien Miller5428f641999-11-25 11:54:57 +1100156/*
157 * Closes the agent socket if it should be closed (depends on how it was
158 * obtained). The argument must have been returned by
159 * ssh_get_authentication_socket().
160 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000161
Damien Miller4af51302000-04-16 11:18:38 +1000162void
Damien Miller95def091999-11-25 00:26:21 +1100163ssh_close_authentication_socket(int sock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000164{
Damien Miller95def091999-11-25 00:26:21 +1100165 if (getenv(SSH_AUTHSOCKET_ENV_NAME))
166 close(sock);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000167}
168
Damien Miller5428f641999-11-25 11:54:57 +1100169/*
170 * Opens and connects a private socket for communication with the
171 * authentication agent. Returns the file descriptor (which must be
172 * shut down and closed by the caller when no longer needed).
173 * Returns NULL if an error occurred and the connection could not be
174 * opened.
175 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000176
Damien Miller95def091999-11-25 00:26:21 +1100177AuthenticationConnection *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000178ssh_get_authentication_connection(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000179{
Damien Miller95def091999-11-25 00:26:21 +1100180 AuthenticationConnection *auth;
181 int sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000182
Damien Miller95def091999-11-25 00:26:21 +1100183 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000184
Damien Miller5428f641999-11-25 11:54:57 +1100185 /*
186 * Fail if we couldn't obtain a connection. This happens if we
187 * exited due to a timeout.
188 */
Damien Miller95def091999-11-25 00:26:21 +1100189 if (sock < 0)
190 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000191
Damien Miller95def091999-11-25 00:26:21 +1100192 auth = xmalloc(sizeof(*auth));
193 auth->fd = sock;
Damien Miller95def091999-11-25 00:26:21 +1100194 buffer_init(&auth->identities);
195 auth->howmany = 0;
196
197 return auth;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000198}
199
Damien Miller5428f641999-11-25 11:54:57 +1100200/*
201 * Closes the connection to the authentication agent and frees any associated
202 * memory.
203 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000204
Damien Miller4af51302000-04-16 11:18:38 +1000205void
Damien Millerad833b32000-08-23 10:46:23 +1000206ssh_close_authentication_connection(AuthenticationConnection *auth)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000207{
Damien Millerad833b32000-08-23 10:46:23 +1000208 buffer_free(&auth->identities);
209 close(auth->fd);
210 xfree(auth);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000211}
212
Damien Miller5428f641999-11-25 11:54:57 +1100213/*
214 * Returns the first authentication identity held by the agent.
Damien Miller5428f641999-11-25 11:54:57 +1100215 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000216
Damien Miller0bc1bd82000-11-13 22:57:25 +1100217int
218ssh_get_num_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000219{
Damien Millerad833b32000-08-23 10:46:23 +1000220 int type, code1 = 0, code2 = 0;
Damien Miller942da032000-08-18 13:59:06 +1000221 Buffer request;
Damien Millerad833b32000-08-23 10:46:23 +1000222
223 switch(version){
224 case 1:
225 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
226 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
227 break;
228 case 2:
229 code1 = SSH2_AGENTC_REQUEST_IDENTITIES;
230 code2 = SSH2_AGENT_IDENTITIES_ANSWER;
231 break;
232 default:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100233 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000234 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000235
Damien Miller5428f641999-11-25 11:54:57 +1100236 /*
237 * Send a message to the agent requesting for a list of the
238 * identities it can represent.
239 */
Damien Miller942da032000-08-18 13:59:06 +1000240 buffer_init(&request);
Damien Millerad833b32000-08-23 10:46:23 +1000241 buffer_put_char(&request, code1);
Damien Miller942da032000-08-18 13:59:06 +1000242
243 buffer_clear(&auth->identities);
244 if (ssh_request_reply(auth, &request, &auth->identities) == 0) {
245 buffer_free(&request);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100246 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000247 }
Damien Miller942da032000-08-18 13:59:06 +1000248 buffer_free(&request);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000249
Damien Miller95def091999-11-25 00:26:21 +1100250 /* Get message type, and verify that we got a proper answer. */
Damien Miller942da032000-08-18 13:59:06 +1000251 type = buffer_get_char(&auth->identities);
Damien Miller874d77b2000-10-14 16:23:11 +1100252 if (agent_failed(type)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100253 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000254 } else if (type != code2) {
Damien Miller942da032000-08-18 13:59:06 +1000255 fatal("Bad authentication reply message type: %d", type);
Damien Millerad833b32000-08-23 10:46:23 +1000256 }
Damien Miller95def091999-11-25 00:26:21 +1100257
258 /* Get the number of entries in the response and check it for sanity. */
259 auth->howmany = buffer_get_int(&auth->identities);
260 if (auth->howmany > 1024)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000261 fatal("Too many identities in authentication reply: %d",
Damien Miller942da032000-08-18 13:59:06 +1000262 auth->howmany);
Damien Miller95def091999-11-25 00:26:21 +1100263
Damien Miller0bc1bd82000-11-13 22:57:25 +1100264 return auth->howmany;
265}
266
267Key *
268ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version)
269{
270 /* get number of identities and return the first entry (if any). */
271 if (ssh_get_num_identities(auth, version) > 0)
272 return ssh_get_next_identity(auth, comment, version);
273 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000274}
275
Damien Millerad833b32000-08-23 10:46:23 +1000276Key *
277ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000278{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000279 u_int bits;
280 u_char *blob;
281 u_int blen;
Damien Millerad833b32000-08-23 10:46:23 +1000282 Key *key = NULL;
Damien Miller7e8e8201999-11-16 13:37:16 +1100283
Damien Miller95def091999-11-25 00:26:21 +1100284 /* Return failure if no more entries. */
285 if (auth->howmany <= 0)
Damien Millerad833b32000-08-23 10:46:23 +1000286 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000287
Damien Miller5428f641999-11-25 11:54:57 +1100288 /*
289 * Get the next entry from the packet. These will abort with a fatal
290 * error if the packet is too short or contains corrupt data.
291 */
Damien Millerad833b32000-08-23 10:46:23 +1000292 switch(version){
293 case 1:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100294 key = key_new(KEY_RSA1);
Damien Millerad833b32000-08-23 10:46:23 +1000295 bits = buffer_get_int(&auth->identities);
296 buffer_get_bignum(&auth->identities, key->rsa->e);
297 buffer_get_bignum(&auth->identities, key->rsa->n);
298 *comment = buffer_get_string(&auth->identities, NULL);
299 if (bits != BN_num_bits(key->rsa->n))
300 log("Warning: identity keysize mismatch: actual %d, announced %u",
301 BN_num_bits(key->rsa->n), bits);
302 break;
303 case 2:
304 blob = buffer_get_string(&auth->identities, &blen);
305 *comment = buffer_get_string(&auth->identities, NULL);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100306 key = key_from_blob(blob, blen);
Damien Millerad833b32000-08-23 10:46:23 +1000307 xfree(blob);
308 break;
309 default:
310 return NULL;
311 break;
312 }
Damien Miller95def091999-11-25 00:26:21 +1100313 /* Decrement the number of remaining entries. */
314 auth->howmany--;
Damien Millerad833b32000-08-23 10:46:23 +1000315 return key;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000316}
317
Damien Miller5428f641999-11-25 11:54:57 +1100318/*
319 * Generates a random challenge, sends it to the agent, and waits for
320 * response from the agent. Returns true (non-zero) if the agent gave the
321 * correct answer, zero otherwise. Response type selects the style of
322 * response desired, with 0 corresponding to protocol version 1.0 (no longer
323 * supported) and 1 corresponding to protocol version 1.1.
324 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000325
326int
327ssh_decrypt_challenge(AuthenticationConnection *auth,
Damien Millerad833b32000-08-23 10:46:23 +1000328 Key* key, BIGNUM *challenge,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000329 u_char session_id[16],
330 u_int response_type,
331 u_char response[16])
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000332{
Damien Miller95def091999-11-25 00:26:21 +1100333 Buffer buffer;
Damien Miller942da032000-08-18 13:59:06 +1000334 int success = 0;
335 int i;
336 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000337
Damien Miller0bc1bd82000-11-13 22:57:25 +1100338 if (key->type != KEY_RSA1)
Damien Millerad833b32000-08-23 10:46:23 +1000339 return 0;
340 if (response_type == 0) {
341 log("Compatibility with ssh protocol version 1.0 no longer supported.");
342 return 0;
343 }
Damien Miller95def091999-11-25 00:26:21 +1100344 buffer_init(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000345 buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE);
Damien Millerad833b32000-08-23 10:46:23 +1000346 buffer_put_int(&buffer, BN_num_bits(key->rsa->n));
347 buffer_put_bignum(&buffer, key->rsa->e);
348 buffer_put_bignum(&buffer, key->rsa->n);
Damien Miller95def091999-11-25 00:26:21 +1100349 buffer_put_bignum(&buffer, challenge);
350 buffer_append(&buffer, (char *) session_id, 16);
351 buffer_put_int(&buffer, response_type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000352
Damien Miller942da032000-08-18 13:59:06 +1000353 if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
Damien Miller95def091999-11-25 00:26:21 +1100354 buffer_free(&buffer);
355 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000356 }
Damien Miller942da032000-08-18 13:59:06 +1000357 type = buffer_get_char(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000358
Damien Miller874d77b2000-10-14 16:23:11 +1100359 if (agent_failed(type)) {
Damien Miller95def091999-11-25 00:26:21 +1100360 log("Agent admitted failure to authenticate using the key.");
Damien Miller942da032000-08-18 13:59:06 +1000361 } else if (type != SSH_AGENT_RSA_RESPONSE) {
362 fatal("Bad authentication response: %d", type);
363 } else {
364 success = 1;
365 /*
366 * Get the response from the packet. This will abort with a
367 * fatal error if the packet is corrupt.
368 */
369 for (i = 0; i < 16; i++)
370 response[i] = buffer_get_char(&buffer);
Damien Miller95def091999-11-25 00:26:21 +1100371 }
Damien Miller95def091999-11-25 00:26:21 +1100372 buffer_free(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000373 return success;
Damien Miller95def091999-11-25 00:26:21 +1100374}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000375
Damien Millerad833b32000-08-23 10:46:23 +1000376/* ask agent to sign data, returns -1 on error, 0 on success */
377int
378ssh_agent_sign(AuthenticationConnection *auth,
379 Key *key,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000380 u_char **sigp, int *lenp,
381 u_char *data, int datalen)
Damien Millerad833b32000-08-23 10:46:23 +1000382{
Damien Miller62cee002000-09-23 17:15:56 +1100383 extern int datafellows;
Damien Millerad833b32000-08-23 10:46:23 +1000384 Buffer msg;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000385 u_char *blob;
386 u_int blen;
Damien Miller62cee002000-09-23 17:15:56 +1100387 int type, flags = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000388 int ret = -1;
389
Damien Miller0bc1bd82000-11-13 22:57:25 +1100390 if (key_to_blob(key, &blob, &blen) == 0)
Damien Millerad833b32000-08-23 10:46:23 +1000391 return -1;
392
Damien Miller62cee002000-09-23 17:15:56 +1100393 if (datafellows & SSH_BUG_SIGBLOB)
394 flags = SSH_AGENT_OLD_SIGNATURE;
395
Damien Millerad833b32000-08-23 10:46:23 +1000396 buffer_init(&msg);
397 buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
398 buffer_put_string(&msg, blob, blen);
399 buffer_put_string(&msg, data, datalen);
Damien Miller62cee002000-09-23 17:15:56 +1100400 buffer_put_int(&msg, flags);
Damien Millerad833b32000-08-23 10:46:23 +1000401 xfree(blob);
402
403 if (ssh_request_reply(auth, &msg, &msg) == 0) {
404 buffer_free(&msg);
405 return -1;
406 }
407 type = buffer_get_char(&msg);
Damien Miller874d77b2000-10-14 16:23:11 +1100408 if (agent_failed(type)) {
Damien Millerad833b32000-08-23 10:46:23 +1000409 log("Agent admitted failure to sign using the key.");
410 } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
411 fatal("Bad authentication response: %d", type);
412 } else {
413 ret = 0;
414 *sigp = buffer_get_string(&msg, lenp);
415 }
416 buffer_free(&msg);
417 return ret;
418}
419
Damien Miller994cf142000-07-21 10:19:44 +1000420/* Encode key for a message to the agent. */
421
Ben Lindstrombba81212001-06-25 05:01:22 +0000422static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100423ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000424{
425 buffer_clear(b);
426 buffer_put_char(b, SSH_AGENTC_ADD_RSA_IDENTITY);
427 buffer_put_int(b, BN_num_bits(key->n));
428 buffer_put_bignum(b, key->n);
429 buffer_put_bignum(b, key->e);
430 buffer_put_bignum(b, key->d);
431 /* To keep within the protocol: p < q for ssh. in SSL p > q */
432 buffer_put_bignum(b, key->iqmp); /* ssh key->u */
433 buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */
434 buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */
Ben Lindstrom664408d2001-06-09 01:42:01 +0000435 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000436}
437
Ben Lindstrombba81212001-06-25 05:01:22 +0000438static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100439ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000440{
441 buffer_clear(b);
442 buffer_put_char(b, SSH2_AGENTC_ADD_IDENTITY);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100443 buffer_put_cstring(b, key_ssh_name(key));
444 switch(key->type){
445 case KEY_RSA:
446 buffer_put_bignum2(b, key->rsa->n);
447 buffer_put_bignum2(b, key->rsa->e);
448 buffer_put_bignum2(b, key->rsa->d);
449 buffer_put_bignum2(b, key->rsa->iqmp);
450 buffer_put_bignum2(b, key->rsa->p);
451 buffer_put_bignum2(b, key->rsa->q);
452 break;
453 case KEY_DSA:
454 buffer_put_bignum2(b, key->dsa->p);
455 buffer_put_bignum2(b, key->dsa->q);
456 buffer_put_bignum2(b, key->dsa->g);
457 buffer_put_bignum2(b, key->dsa->pub_key);
458 buffer_put_bignum2(b, key->dsa->priv_key);
459 break;
460 }
461 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000462}
463
Damien Miller5428f641999-11-25 11:54:57 +1100464/*
465 * Adds an identity to the authentication server. This call is not meant to
466 * be used by normal applications.
467 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000468
Damien Miller4af51302000-04-16 11:18:38 +1000469int
Damien Miller994cf142000-07-21 10:19:44 +1000470ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000471{
Damien Millerad833b32000-08-23 10:46:23 +1000472 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000473 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000474
Damien Millerad833b32000-08-23 10:46:23 +1000475 buffer_init(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000476
477 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100478 case KEY_RSA1:
479 ssh_encode_identity_rsa1(&msg, key->rsa, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000480 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100481 case KEY_RSA:
Damien Miller994cf142000-07-21 10:19:44 +1000482 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100483 ssh_encode_identity_ssh2(&msg, key, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000484 break;
485 default:
Damien Millerad833b32000-08-23 10:46:23 +1000486 buffer_free(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000487 return 0;
488 break;
489 }
Damien Millerad833b32000-08-23 10:46:23 +1000490 if (ssh_request_reply(auth, &msg, &msg) == 0) {
491 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100492 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000493 }
Damien Millerad833b32000-08-23 10:46:23 +1000494 type = buffer_get_char(&msg);
495 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000496 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100497}
498
Damien Miller5428f641999-11-25 11:54:57 +1100499/*
500 * Removes an identity from the authentication server. This call is not
501 * meant to be used by normal applications.
502 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000503
Damien Miller4af51302000-04-16 11:18:38 +1000504int
Damien Millerad833b32000-08-23 10:46:23 +1000505ssh_remove_identity(AuthenticationConnection *auth, Key *key)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000506{
Damien Millerad833b32000-08-23 10:46:23 +1000507 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000508 int type;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000509 u_char *blob;
510 u_int blen;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000511
Damien Millerad833b32000-08-23 10:46:23 +1000512 buffer_init(&msg);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000513
Damien Miller0bc1bd82000-11-13 22:57:25 +1100514 if (key->type == KEY_RSA1) {
Damien Millerad833b32000-08-23 10:46:23 +1000515 buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY);
516 buffer_put_int(&msg, BN_num_bits(key->rsa->n));
517 buffer_put_bignum(&msg, key->rsa->e);
518 buffer_put_bignum(&msg, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100519 } else if (key->type == KEY_DSA || key->type == KEY_RSA) {
520 key_to_blob(key, &blob, &blen);
Damien Millerad833b32000-08-23 10:46:23 +1000521 buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY);
522 buffer_put_string(&msg, blob, blen);
523 xfree(blob);
524 } else {
525 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100526 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000527 }
Damien Millerad833b32000-08-23 10:46:23 +1000528 if (ssh_request_reply(auth, &msg, &msg) == 0) {
529 buffer_free(&msg);
530 return 0;
531 }
532 type = buffer_get_char(&msg);
533 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000534 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100535}
536
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000537int
538ssh_update_card(AuthenticationConnection *auth, int add, int reader_id)
539{
540 Buffer msg;
541 int type;
542
543 buffer_init(&msg);
544 buffer_put_char(&msg, add ? SSH_AGENTC_ADD_SMARTCARD_KEY :
545 SSH_AGENTC_REMOVE_SMARTCARD_KEY);
546 buffer_put_int(&msg, reader_id);
547 if (ssh_request_reply(auth, &msg, &msg) == 0) {
548 buffer_free(&msg);
549 return 0;
550 }
551 type = buffer_get_char(&msg);
552 buffer_free(&msg);
553 return decode_reply(type);
554}
555
Damien Miller5428f641999-11-25 11:54:57 +1100556/*
557 * Removes all identities from the agent. This call is not meant to be used
558 * by normal applications.
559 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000560
Damien Miller4af51302000-04-16 11:18:38 +1000561int
Damien Millerad833b32000-08-23 10:46:23 +1000562ssh_remove_all_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000563{
Damien Millerad833b32000-08-23 10:46:23 +1000564 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000565 int type;
Damien Millerad833b32000-08-23 10:46:23 +1000566 int code = (version==1) ?
567 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
568 SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000569
Damien Millerad833b32000-08-23 10:46:23 +1000570 buffer_init(&msg);
571 buffer_put_char(&msg, code);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000572
Damien Millerad833b32000-08-23 10:46:23 +1000573 if (ssh_request_reply(auth, &msg, &msg) == 0) {
574 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100575 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000576 }
Damien Millerad833b32000-08-23 10:46:23 +1000577 type = buffer_get_char(&msg);
578 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000579 return decode_reply(type);
580}
581
Kevin Stevesef4eea92001-02-05 12:42:17 +0000582int
Damien Miller942da032000-08-18 13:59:06 +1000583decode_reply(int type)
584{
Damien Miller95def091999-11-25 00:26:21 +1100585 switch (type) {
586 case SSH_AGENT_FAILURE:
Damien Miller874d77b2000-10-14 16:23:11 +1100587 case SSH_COM_AGENT2_FAILURE:
Damien Miller942da032000-08-18 13:59:06 +1000588 log("SSH_AGENT_FAILURE");
Damien Miller95def091999-11-25 00:26:21 +1100589 return 0;
590 case SSH_AGENT_SUCCESS:
Damien Miller95def091999-11-25 00:26:21 +1100591 return 1;
592 default:
Damien Miller37023962000-07-11 17:31:38 +1000593 fatal("Bad response from authentication agent: %d", type);
Damien Miller95def091999-11-25 00:26:21 +1100594 }
595 /* NOTREACHED */
596 return 0;
597}