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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 Lindstromba72d302002-03-22 03:51:06 +000038RCSID("$OpenBSD: authfd.c,v 1.49 2002/03/21 22:44:05 rees 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) || \
62 (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 }
147 buffer_append(reply, (char *) buf, l);
148 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
Damien Miller5428f641999-11-25 11:54:57 +1100210/*
211 * Returns the first authentication identity held by the agent.
Damien Miller5428f641999-11-25 11:54:57 +1100212 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000213
Damien Miller0bc1bd82000-11-13 22:57:25 +1100214int
215ssh_get_num_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000216{
Damien Millerad833b32000-08-23 10:46:23 +1000217 int type, code1 = 0, code2 = 0;
Damien Miller942da032000-08-18 13:59:06 +1000218 Buffer request;
Damien Millerad833b32000-08-23 10:46:23 +1000219
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000220 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000221 case 1:
222 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
223 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
224 break;
225 case 2:
226 code1 = SSH2_AGENTC_REQUEST_IDENTITIES;
227 code2 = SSH2_AGENT_IDENTITIES_ANSWER;
228 break;
229 default:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100230 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000231 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000232
Damien Miller5428f641999-11-25 11:54:57 +1100233 /*
234 * Send a message to the agent requesting for a list of the
235 * identities it can represent.
236 */
Damien Miller942da032000-08-18 13:59:06 +1000237 buffer_init(&request);
Damien Millerad833b32000-08-23 10:46:23 +1000238 buffer_put_char(&request, code1);
Damien Miller942da032000-08-18 13:59:06 +1000239
240 buffer_clear(&auth->identities);
241 if (ssh_request_reply(auth, &request, &auth->identities) == 0) {
242 buffer_free(&request);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100243 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000244 }
Damien Miller942da032000-08-18 13:59:06 +1000245 buffer_free(&request);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000246
Damien Miller95def091999-11-25 00:26:21 +1100247 /* Get message type, and verify that we got a proper answer. */
Damien Miller942da032000-08-18 13:59:06 +1000248 type = buffer_get_char(&auth->identities);
Damien Miller874d77b2000-10-14 16:23:11 +1100249 if (agent_failed(type)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100250 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000251 } else if (type != code2) {
Damien Miller942da032000-08-18 13:59:06 +1000252 fatal("Bad authentication reply message type: %d", type);
Damien Millerad833b32000-08-23 10:46:23 +1000253 }
Damien Miller95def091999-11-25 00:26:21 +1100254
255 /* Get the number of entries in the response and check it for sanity. */
256 auth->howmany = buffer_get_int(&auth->identities);
257 if (auth->howmany > 1024)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000258 fatal("Too many identities in authentication reply: %d",
Damien Miller942da032000-08-18 13:59:06 +1000259 auth->howmany);
Damien Miller95def091999-11-25 00:26:21 +1100260
Damien Miller0bc1bd82000-11-13 22:57:25 +1100261 return auth->howmany;
262}
263
264Key *
265ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version)
266{
267 /* get number of identities and return the first entry (if any). */
268 if (ssh_get_num_identities(auth, version) > 0)
269 return ssh_get_next_identity(auth, comment, version);
270 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000271}
272
Damien Millerad833b32000-08-23 10:46:23 +1000273Key *
274ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000275{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000276 u_int bits;
277 u_char *blob;
278 u_int blen;
Damien Millerad833b32000-08-23 10:46:23 +1000279 Key *key = NULL;
Damien Miller7e8e8201999-11-16 13:37:16 +1100280
Damien Miller95def091999-11-25 00:26:21 +1100281 /* Return failure if no more entries. */
282 if (auth->howmany <= 0)
Damien Millerad833b32000-08-23 10:46:23 +1000283 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000284
Damien Miller5428f641999-11-25 11:54:57 +1100285 /*
286 * Get the next entry from the packet. These will abort with a fatal
287 * error if the packet is too short or contains corrupt data.
288 */
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000289 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000290 case 1:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100291 key = key_new(KEY_RSA1);
Damien Millerad833b32000-08-23 10:46:23 +1000292 bits = buffer_get_int(&auth->identities);
293 buffer_get_bignum(&auth->identities, key->rsa->e);
294 buffer_get_bignum(&auth->identities, key->rsa->n);
295 *comment = buffer_get_string(&auth->identities, NULL);
296 if (bits != BN_num_bits(key->rsa->n))
297 log("Warning: identity keysize mismatch: actual %d, announced %u",
298 BN_num_bits(key->rsa->n), bits);
299 break;
300 case 2:
301 blob = buffer_get_string(&auth->identities, &blen);
302 *comment = buffer_get_string(&auth->identities, NULL);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100303 key = key_from_blob(blob, blen);
Damien Millerad833b32000-08-23 10:46:23 +1000304 xfree(blob);
305 break;
306 default:
307 return NULL;
308 break;
309 }
Damien Miller95def091999-11-25 00:26:21 +1100310 /* Decrement the number of remaining entries. */
311 auth->howmany--;
Damien Millerad833b32000-08-23 10:46:23 +1000312 return key;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000313}
314
Damien Miller5428f641999-11-25 11:54:57 +1100315/*
316 * Generates a random challenge, sends it to the agent, and waits for
317 * response from the agent. Returns true (non-zero) if the agent gave the
318 * correct answer, zero otherwise. Response type selects the style of
319 * response desired, with 0 corresponding to protocol version 1.0 (no longer
320 * supported) and 1 corresponding to protocol version 1.1.
321 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000322
323int
324ssh_decrypt_challenge(AuthenticationConnection *auth,
Damien Millerad833b32000-08-23 10:46:23 +1000325 Key* key, BIGNUM *challenge,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000326 u_char session_id[16],
327 u_int response_type,
328 u_char response[16])
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000329{
Damien Miller95def091999-11-25 00:26:21 +1100330 Buffer buffer;
Damien Miller942da032000-08-18 13:59:06 +1000331 int success = 0;
332 int i;
333 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000334
Damien Miller0bc1bd82000-11-13 22:57:25 +1100335 if (key->type != KEY_RSA1)
Damien Millerad833b32000-08-23 10:46:23 +1000336 return 0;
337 if (response_type == 0) {
338 log("Compatibility with ssh protocol version 1.0 no longer supported.");
339 return 0;
340 }
Damien Miller95def091999-11-25 00:26:21 +1100341 buffer_init(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000342 buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE);
Damien Millerad833b32000-08-23 10:46:23 +1000343 buffer_put_int(&buffer, BN_num_bits(key->rsa->n));
344 buffer_put_bignum(&buffer, key->rsa->e);
345 buffer_put_bignum(&buffer, key->rsa->n);
Damien Miller95def091999-11-25 00:26:21 +1100346 buffer_put_bignum(&buffer, challenge);
Damien Miller4a8ed542002-01-22 23:33:31 +1100347 buffer_append(&buffer, session_id, 16);
Damien Miller95def091999-11-25 00:26:21 +1100348 buffer_put_int(&buffer, response_type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000349
Damien Miller942da032000-08-18 13:59:06 +1000350 if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
Damien Miller95def091999-11-25 00:26:21 +1100351 buffer_free(&buffer);
352 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000353 }
Damien Miller942da032000-08-18 13:59:06 +1000354 type = buffer_get_char(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000355
Damien Miller874d77b2000-10-14 16:23:11 +1100356 if (agent_failed(type)) {
Damien Miller95def091999-11-25 00:26:21 +1100357 log("Agent admitted failure to authenticate using the key.");
Damien Miller942da032000-08-18 13:59:06 +1000358 } else if (type != SSH_AGENT_RSA_RESPONSE) {
359 fatal("Bad authentication response: %d", type);
360 } else {
361 success = 1;
362 /*
363 * Get the response from the packet. This will abort with a
364 * fatal error if the packet is corrupt.
365 */
366 for (i = 0; i < 16; i++)
367 response[i] = buffer_get_char(&buffer);
Damien Miller95def091999-11-25 00:26:21 +1100368 }
Damien Miller95def091999-11-25 00:26:21 +1100369 buffer_free(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000370 return success;
Damien Miller95def091999-11-25 00:26:21 +1100371}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000372
Damien Millerad833b32000-08-23 10:46:23 +1000373/* ask agent to sign data, returns -1 on error, 0 on success */
374int
375ssh_agent_sign(AuthenticationConnection *auth,
376 Key *key,
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000377 u_char **sigp, u_int *lenp,
378 u_char *data, u_int datalen)
Damien Millerad833b32000-08-23 10:46:23 +1000379{
Damien Miller62cee002000-09-23 17:15:56 +1100380 extern int datafellows;
Damien Millerad833b32000-08-23 10:46:23 +1000381 Buffer msg;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000382 u_char *blob;
383 u_int blen;
Damien Miller62cee002000-09-23 17:15:56 +1100384 int type, flags = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000385 int ret = -1;
386
Damien Miller0bc1bd82000-11-13 22:57:25 +1100387 if (key_to_blob(key, &blob, &blen) == 0)
Damien Millerad833b32000-08-23 10:46:23 +1000388 return -1;
389
Damien Miller62cee002000-09-23 17:15:56 +1100390 if (datafellows & SSH_BUG_SIGBLOB)
391 flags = SSH_AGENT_OLD_SIGNATURE;
392
Damien Millerad833b32000-08-23 10:46:23 +1000393 buffer_init(&msg);
394 buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
395 buffer_put_string(&msg, blob, blen);
396 buffer_put_string(&msg, data, datalen);
Damien Miller62cee002000-09-23 17:15:56 +1100397 buffer_put_int(&msg, flags);
Damien Millerad833b32000-08-23 10:46:23 +1000398 xfree(blob);
399
400 if (ssh_request_reply(auth, &msg, &msg) == 0) {
401 buffer_free(&msg);
402 return -1;
403 }
404 type = buffer_get_char(&msg);
Damien Miller874d77b2000-10-14 16:23:11 +1100405 if (agent_failed(type)) {
Damien Millerad833b32000-08-23 10:46:23 +1000406 log("Agent admitted failure to sign using the key.");
407 } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
408 fatal("Bad authentication response: %d", type);
409 } else {
410 ret = 0;
411 *sigp = buffer_get_string(&msg, lenp);
412 }
413 buffer_free(&msg);
414 return ret;
415}
416
Damien Miller994cf142000-07-21 10:19:44 +1000417/* Encode key for a message to the agent. */
418
Ben Lindstrombba81212001-06-25 05:01:22 +0000419static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100420ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000421{
422 buffer_clear(b);
423 buffer_put_char(b, SSH_AGENTC_ADD_RSA_IDENTITY);
424 buffer_put_int(b, BN_num_bits(key->n));
425 buffer_put_bignum(b, key->n);
426 buffer_put_bignum(b, key->e);
427 buffer_put_bignum(b, key->d);
428 /* To keep within the protocol: p < q for ssh. in SSL p > q */
429 buffer_put_bignum(b, key->iqmp); /* ssh key->u */
430 buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */
431 buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */
Ben Lindstrom664408d2001-06-09 01:42:01 +0000432 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000433}
434
Ben Lindstrombba81212001-06-25 05:01:22 +0000435static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100436ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000437{
438 buffer_clear(b);
439 buffer_put_char(b, SSH2_AGENTC_ADD_IDENTITY);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100440 buffer_put_cstring(b, key_ssh_name(key));
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000441 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100442 case KEY_RSA:
443 buffer_put_bignum2(b, key->rsa->n);
444 buffer_put_bignum2(b, key->rsa->e);
445 buffer_put_bignum2(b, key->rsa->d);
446 buffer_put_bignum2(b, key->rsa->iqmp);
447 buffer_put_bignum2(b, key->rsa->p);
448 buffer_put_bignum2(b, key->rsa->q);
449 break;
450 case KEY_DSA:
451 buffer_put_bignum2(b, key->dsa->p);
452 buffer_put_bignum2(b, key->dsa->q);
453 buffer_put_bignum2(b, key->dsa->g);
454 buffer_put_bignum2(b, key->dsa->pub_key);
455 buffer_put_bignum2(b, key->dsa->priv_key);
456 break;
457 }
458 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000459}
460
Damien Miller5428f641999-11-25 11:54:57 +1100461/*
462 * Adds an identity to the authentication server. This call is not meant to
463 * be used by normal applications.
464 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000465
Damien Miller4af51302000-04-16 11:18:38 +1000466int
Damien Miller994cf142000-07-21 10:19:44 +1000467ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000468{
Damien Millerad833b32000-08-23 10:46:23 +1000469 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000470 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000471
Damien Millerad833b32000-08-23 10:46:23 +1000472 buffer_init(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000473
474 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100475 case KEY_RSA1:
476 ssh_encode_identity_rsa1(&msg, key->rsa, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000477 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100478 case KEY_RSA:
Damien Miller994cf142000-07-21 10:19:44 +1000479 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100480 ssh_encode_identity_ssh2(&msg, key, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000481 break;
482 default:
Damien Millerad833b32000-08-23 10:46:23 +1000483 buffer_free(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000484 return 0;
485 break;
486 }
Damien Millerad833b32000-08-23 10:46:23 +1000487 if (ssh_request_reply(auth, &msg, &msg) == 0) {
488 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100489 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000490 }
Damien Millerad833b32000-08-23 10:46:23 +1000491 type = buffer_get_char(&msg);
492 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000493 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100494}
495
Damien Miller5428f641999-11-25 11:54:57 +1100496/*
497 * Removes an identity from the authentication server. This call is not
498 * meant to be used by normal applications.
499 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000500
Damien Miller4af51302000-04-16 11:18:38 +1000501int
Damien Millerad833b32000-08-23 10:46:23 +1000502ssh_remove_identity(AuthenticationConnection *auth, Key *key)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000503{
Damien Millerad833b32000-08-23 10:46:23 +1000504 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000505 int type;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000506 u_char *blob;
507 u_int blen;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000508
Damien Millerad833b32000-08-23 10:46:23 +1000509 buffer_init(&msg);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000510
Damien Miller0bc1bd82000-11-13 22:57:25 +1100511 if (key->type == KEY_RSA1) {
Damien Millerad833b32000-08-23 10:46:23 +1000512 buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY);
513 buffer_put_int(&msg, BN_num_bits(key->rsa->n));
514 buffer_put_bignum(&msg, key->rsa->e);
515 buffer_put_bignum(&msg, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100516 } else if (key->type == KEY_DSA || key->type == KEY_RSA) {
517 key_to_blob(key, &blob, &blen);
Damien Millerad833b32000-08-23 10:46:23 +1000518 buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY);
519 buffer_put_string(&msg, blob, blen);
520 xfree(blob);
521 } else {
522 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100523 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000524 }
Damien Millerad833b32000-08-23 10:46:23 +1000525 if (ssh_request_reply(auth, &msg, &msg) == 0) {
526 buffer_free(&msg);
527 return 0;
528 }
529 type = buffer_get_char(&msg);
530 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000531 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100532}
533
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000534int
Ben Lindstromba72d302002-03-22 03:51:06 +0000535ssh_update_card(AuthenticationConnection *auth, int add, const char *reader_id, const char *pin)
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000536{
537 Buffer msg;
538 int type;
539
540 buffer_init(&msg);
541 buffer_put_char(&msg, add ? SSH_AGENTC_ADD_SMARTCARD_KEY :
542 SSH_AGENTC_REMOVE_SMARTCARD_KEY);
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000543 buffer_put_cstring(&msg, reader_id);
Ben Lindstromba72d302002-03-22 03:51:06 +0000544 buffer_put_cstring(&msg, pin);
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000545 if (ssh_request_reply(auth, &msg, &msg) == 0) {
546 buffer_free(&msg);
547 return 0;
548 }
549 type = buffer_get_char(&msg);
550 buffer_free(&msg);
551 return decode_reply(type);
552}
553
Damien Miller5428f641999-11-25 11:54:57 +1100554/*
555 * Removes all identities from the agent. This call is not meant to be used
556 * 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_all_identities(AuthenticationConnection *auth, int version)
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;
Damien Millerad833b32000-08-23 10:46:23 +1000564 int code = (version==1) ?
565 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
566 SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000567
Damien Millerad833b32000-08-23 10:46:23 +1000568 buffer_init(&msg);
569 buffer_put_char(&msg, code);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000570
Damien Millerad833b32000-08-23 10:46:23 +1000571 if (ssh_request_reply(auth, &msg, &msg) == 0) {
572 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100573 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000574 }
Damien Millerad833b32000-08-23 10:46:23 +1000575 type = buffer_get_char(&msg);
576 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000577 return decode_reply(type);
578}
579
Kevin Stevesef4eea92001-02-05 12:42:17 +0000580int
Damien Miller942da032000-08-18 13:59:06 +1000581decode_reply(int type)
582{
Damien Miller95def091999-11-25 00:26:21 +1100583 switch (type) {
584 case SSH_AGENT_FAILURE:
Damien Miller874d77b2000-10-14 16:23:11 +1100585 case SSH_COM_AGENT2_FAILURE:
Ben Lindstromc9a26362001-08-15 23:04:50 +0000586 case SSH2_AGENT_FAILURE:
Damien Miller942da032000-08-18 13:59:06 +1000587 log("SSH_AGENT_FAILURE");
Damien Miller95def091999-11-25 00:26:21 +1100588 return 0;
589 case SSH_AGENT_SUCCESS:
Damien Miller95def091999-11-25 00:26:21 +1100590 return 1;
591 default:
Damien Miller37023962000-07-11 17:31:38 +1000592 fatal("Bad response from authentication agent: %d", type);
Damien Miller95def091999-11-25 00:26:21 +1100593 }
594 /* NOTREACHED */
595 return 0;
596}