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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"
Darren Tucker9f63f222003-07-03 13:46:56 +100038RCSID("$OpenBSD: authfd.c,v 1.61 2003/06/28 16:23:06 deraadt 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{
117 int l, len;
118 char buf[1024];
119
120 /* Get the length of the message, and format it in the buffer. */
121 len = buffer_len(request);
122 PUT_32BIT(buf, len);
123
124 /* Send the length and then the packet to the agent. */
Darren Tucker9f63f222003-07-03 13:46:56 +1000125 if (atomicio(vwrite, auth->fd, buf, 4) != 4 ||
126 atomicio(vwrite, auth->fd, buffer_ptr(request),
Damien Miller942da032000-08-18 13:59:06 +1000127 buffer_len(request)) != buffer_len(request)) {
128 error("Error writing to authentication socket.");
129 return 0;
130 }
131 /*
132 * Wait for response from the agent. First read the length of the
133 * response packet.
134 */
135 len = 4;
136 while (len > 0) {
137 l = read(auth->fd, buf + 4 - len, len);
Ben Lindstromb3144e52001-03-06 03:31:34 +0000138 if (l == -1 && (errno == EAGAIN || errno == EINTR))
Ben Lindstroma3700052001-04-05 23:26:32 +0000139 continue;
Damien Miller942da032000-08-18 13:59:06 +1000140 if (l <= 0) {
141 error("Error reading response length from authentication socket.");
142 return 0;
143 }
144 len -= l;
145 }
146
147 /* Extract the length, and check it for sanity. */
148 len = GET_32BIT(buf);
149 if (len > 256 * 1024)
150 fatal("Authentication response too long: %d", len);
151
152 /* Read the rest of the response in to the buffer. */
153 buffer_clear(reply);
154 while (len > 0) {
155 l = len;
156 if (l > sizeof(buf))
157 l = sizeof(buf);
158 l = read(auth->fd, buf, l);
Ben Lindstromb3144e52001-03-06 03:31:34 +0000159 if (l == -1 && (errno == EAGAIN || errno == EINTR))
Ben Lindstroma3700052001-04-05 23:26:32 +0000160 continue;
Damien Miller942da032000-08-18 13:59:06 +1000161 if (l <= 0) {
162 error("Error reading response from authentication socket.");
163 return 0;
164 }
Ben Lindstrom6398a0e2002-06-25 23:22:54 +0000165 buffer_append(reply, buf, l);
Damien Miller942da032000-08-18 13:59:06 +1000166 len -= l;
167 }
168 return 1;
169}
170
Damien Miller5428f641999-11-25 11:54:57 +1100171/*
172 * Closes the agent socket if it should be closed (depends on how it was
173 * obtained). The argument must have been returned by
174 * ssh_get_authentication_socket().
175 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000176
Damien Miller4af51302000-04-16 11:18:38 +1000177void
Damien Miller95def091999-11-25 00:26:21 +1100178ssh_close_authentication_socket(int sock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000179{
Damien Miller95def091999-11-25 00:26:21 +1100180 if (getenv(SSH_AUTHSOCKET_ENV_NAME))
181 close(sock);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000182}
183
Damien Miller5428f641999-11-25 11:54:57 +1100184/*
185 * Opens and connects a private socket for communication with the
186 * authentication agent. Returns the file descriptor (which must be
187 * shut down and closed by the caller when no longer needed).
188 * Returns NULL if an error occurred and the connection could not be
189 * opened.
190 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000191
Damien Miller95def091999-11-25 00:26:21 +1100192AuthenticationConnection *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000193ssh_get_authentication_connection(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000194{
Damien Miller95def091999-11-25 00:26:21 +1100195 AuthenticationConnection *auth;
196 int sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000197
Damien Miller95def091999-11-25 00:26:21 +1100198 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199
Damien Miller5428f641999-11-25 11:54:57 +1100200 /*
201 * Fail if we couldn't obtain a connection. This happens if we
202 * exited due to a timeout.
203 */
Damien Miller95def091999-11-25 00:26:21 +1100204 if (sock < 0)
205 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000206
Damien Miller95def091999-11-25 00:26:21 +1100207 auth = xmalloc(sizeof(*auth));
208 auth->fd = sock;
Damien Miller95def091999-11-25 00:26:21 +1100209 buffer_init(&auth->identities);
210 auth->howmany = 0;
211
212 return auth;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000213}
214
Damien Miller5428f641999-11-25 11:54:57 +1100215/*
216 * Closes the connection to the authentication agent and frees any associated
217 * memory.
218 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000219
Damien Miller4af51302000-04-16 11:18:38 +1000220void
Damien Millerad833b32000-08-23 10:46:23 +1000221ssh_close_authentication_connection(AuthenticationConnection *auth)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000222{
Damien Millerad833b32000-08-23 10:46:23 +1000223 buffer_free(&auth->identities);
224 close(auth->fd);
225 xfree(auth);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000226}
227
Ben Lindstrom2f717042002-06-06 21:52:03 +0000228/* Lock/unlock agent */
229int
230ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password)
231{
232 int type;
233 Buffer msg;
234
235 buffer_init(&msg);
236 buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK);
237 buffer_put_cstring(&msg, password);
238
239 if (ssh_request_reply(auth, &msg, &msg) == 0) {
240 buffer_free(&msg);
241 return 0;
242 }
243 type = buffer_get_char(&msg);
244 buffer_free(&msg);
245 return decode_reply(type);
246}
247
Damien Miller5428f641999-11-25 11:54:57 +1100248/*
249 * Returns the first authentication identity held by the agent.
Damien Miller5428f641999-11-25 11:54:57 +1100250 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000251
Damien Miller0bc1bd82000-11-13 22:57:25 +1100252int
253ssh_get_num_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000254{
Damien Millerad833b32000-08-23 10:46:23 +1000255 int type, code1 = 0, code2 = 0;
Damien Miller942da032000-08-18 13:59:06 +1000256 Buffer request;
Damien Millerad833b32000-08-23 10:46:23 +1000257
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000258 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000259 case 1:
260 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
261 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
262 break;
263 case 2:
264 code1 = SSH2_AGENTC_REQUEST_IDENTITIES;
265 code2 = SSH2_AGENT_IDENTITIES_ANSWER;
266 break;
267 default:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100268 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000269 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000270
Damien Miller5428f641999-11-25 11:54:57 +1100271 /*
272 * Send a message to the agent requesting for a list of the
273 * identities it can represent.
274 */
Damien Miller942da032000-08-18 13:59:06 +1000275 buffer_init(&request);
Damien Millerad833b32000-08-23 10:46:23 +1000276 buffer_put_char(&request, code1);
Damien Miller942da032000-08-18 13:59:06 +1000277
278 buffer_clear(&auth->identities);
279 if (ssh_request_reply(auth, &request, &auth->identities) == 0) {
280 buffer_free(&request);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100281 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000282 }
Damien Miller942da032000-08-18 13:59:06 +1000283 buffer_free(&request);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000284
Damien Miller95def091999-11-25 00:26:21 +1100285 /* Get message type, and verify that we got a proper answer. */
Damien Miller942da032000-08-18 13:59:06 +1000286 type = buffer_get_char(&auth->identities);
Damien Miller874d77b2000-10-14 16:23:11 +1100287 if (agent_failed(type)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100288 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000289 } else if (type != code2) {
Damien Miller942da032000-08-18 13:59:06 +1000290 fatal("Bad authentication reply message type: %d", type);
Damien Millerad833b32000-08-23 10:46:23 +1000291 }
Damien Miller95def091999-11-25 00:26:21 +1100292
293 /* Get the number of entries in the response and check it for sanity. */
294 auth->howmany = buffer_get_int(&auth->identities);
295 if (auth->howmany > 1024)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000296 fatal("Too many identities in authentication reply: %d",
Damien Miller942da032000-08-18 13:59:06 +1000297 auth->howmany);
Damien Miller95def091999-11-25 00:26:21 +1100298
Damien Miller0bc1bd82000-11-13 22:57:25 +1100299 return auth->howmany;
300}
301
302Key *
303ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version)
304{
305 /* get number of identities and return the first entry (if any). */
306 if (ssh_get_num_identities(auth, version) > 0)
307 return ssh_get_next_identity(auth, comment, version);
308 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000309}
310
Damien Millerad833b32000-08-23 10:46:23 +1000311Key *
312ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000313{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000314 u_int bits;
315 u_char *blob;
316 u_int blen;
Damien Millerad833b32000-08-23 10:46:23 +1000317 Key *key = NULL;
Damien Miller7e8e8201999-11-16 13:37:16 +1100318
Damien Miller95def091999-11-25 00:26:21 +1100319 /* Return failure if no more entries. */
320 if (auth->howmany <= 0)
Damien Millerad833b32000-08-23 10:46:23 +1000321 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000322
Damien Miller5428f641999-11-25 11:54:57 +1100323 /*
324 * Get the next entry from the packet. These will abort with a fatal
325 * error if the packet is too short or contains corrupt data.
326 */
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000327 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000328 case 1:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100329 key = key_new(KEY_RSA1);
Damien Millerad833b32000-08-23 10:46:23 +1000330 bits = buffer_get_int(&auth->identities);
331 buffer_get_bignum(&auth->identities, key->rsa->e);
332 buffer_get_bignum(&auth->identities, key->rsa->n);
333 *comment = buffer_get_string(&auth->identities, NULL);
334 if (bits != BN_num_bits(key->rsa->n))
Damien Miller996acd22003-04-09 20:59:48 +1000335 logit("Warning: identity keysize mismatch: actual %d, announced %u",
Damien Millerad833b32000-08-23 10:46:23 +1000336 BN_num_bits(key->rsa->n), bits);
337 break;
338 case 2:
339 blob = buffer_get_string(&auth->identities, &blen);
340 *comment = buffer_get_string(&auth->identities, NULL);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100341 key = key_from_blob(blob, blen);
Damien Millerad833b32000-08-23 10:46:23 +1000342 xfree(blob);
343 break;
344 default:
345 return NULL;
346 break;
347 }
Damien Miller95def091999-11-25 00:26:21 +1100348 /* Decrement the number of remaining entries. */
349 auth->howmany--;
Damien Millerad833b32000-08-23 10:46:23 +1000350 return key;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000351}
352
Damien Miller5428f641999-11-25 11:54:57 +1100353/*
354 * Generates a random challenge, sends it to the agent, and waits for
355 * response from the agent. Returns true (non-zero) if the agent gave the
356 * correct answer, zero otherwise. Response type selects the style of
357 * response desired, with 0 corresponding to protocol version 1.0 (no longer
358 * supported) and 1 corresponding to protocol version 1.1.
359 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000360
361int
362ssh_decrypt_challenge(AuthenticationConnection *auth,
Damien Millerad833b32000-08-23 10:46:23 +1000363 Key* key, BIGNUM *challenge,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000364 u_char session_id[16],
365 u_int response_type,
366 u_char response[16])
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000367{
Damien Miller95def091999-11-25 00:26:21 +1100368 Buffer buffer;
Damien Miller942da032000-08-18 13:59:06 +1000369 int success = 0;
370 int i;
371 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000372
Damien Miller0bc1bd82000-11-13 22:57:25 +1100373 if (key->type != KEY_RSA1)
Damien Millerad833b32000-08-23 10:46:23 +1000374 return 0;
375 if (response_type == 0) {
Damien Miller996acd22003-04-09 20:59:48 +1000376 logit("Compatibility with ssh protocol version 1.0 no longer supported.");
Damien Millerad833b32000-08-23 10:46:23 +1000377 return 0;
378 }
Damien Miller95def091999-11-25 00:26:21 +1100379 buffer_init(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000380 buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE);
Damien Millerad833b32000-08-23 10:46:23 +1000381 buffer_put_int(&buffer, BN_num_bits(key->rsa->n));
382 buffer_put_bignum(&buffer, key->rsa->e);
383 buffer_put_bignum(&buffer, key->rsa->n);
Damien Miller95def091999-11-25 00:26:21 +1100384 buffer_put_bignum(&buffer, challenge);
Damien Miller4a8ed542002-01-22 23:33:31 +1100385 buffer_append(&buffer, session_id, 16);
Damien Miller95def091999-11-25 00:26:21 +1100386 buffer_put_int(&buffer, response_type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000387
Damien Miller942da032000-08-18 13:59:06 +1000388 if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
Damien Miller95def091999-11-25 00:26:21 +1100389 buffer_free(&buffer);
390 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000391 }
Damien Miller942da032000-08-18 13:59:06 +1000392 type = buffer_get_char(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000393
Damien Miller874d77b2000-10-14 16:23:11 +1100394 if (agent_failed(type)) {
Damien Miller996acd22003-04-09 20:59:48 +1000395 logit("Agent admitted failure to authenticate using the key.");
Damien Miller942da032000-08-18 13:59:06 +1000396 } else if (type != SSH_AGENT_RSA_RESPONSE) {
397 fatal("Bad authentication response: %d", type);
398 } else {
399 success = 1;
400 /*
401 * Get the response from the packet. This will abort with a
402 * fatal error if the packet is corrupt.
403 */
404 for (i = 0; i < 16; i++)
405 response[i] = buffer_get_char(&buffer);
Damien Miller95def091999-11-25 00:26:21 +1100406 }
Damien Miller95def091999-11-25 00:26:21 +1100407 buffer_free(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000408 return success;
Damien Miller95def091999-11-25 00:26:21 +1100409}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000410
Damien Millerad833b32000-08-23 10:46:23 +1000411/* ask agent to sign data, returns -1 on error, 0 on success */
412int
413ssh_agent_sign(AuthenticationConnection *auth,
414 Key *key,
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000415 u_char **sigp, u_int *lenp,
416 u_char *data, u_int datalen)
Damien Millerad833b32000-08-23 10:46:23 +1000417{
Damien Miller62cee002000-09-23 17:15:56 +1100418 extern int datafellows;
Damien Millerad833b32000-08-23 10:46:23 +1000419 Buffer msg;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000420 u_char *blob;
421 u_int blen;
Damien Miller62cee002000-09-23 17:15:56 +1100422 int type, flags = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000423 int ret = -1;
424
Damien Miller0bc1bd82000-11-13 22:57:25 +1100425 if (key_to_blob(key, &blob, &blen) == 0)
Damien Millerad833b32000-08-23 10:46:23 +1000426 return -1;
427
Damien Miller62cee002000-09-23 17:15:56 +1100428 if (datafellows & SSH_BUG_SIGBLOB)
429 flags = SSH_AGENT_OLD_SIGNATURE;
430
Damien Millerad833b32000-08-23 10:46:23 +1000431 buffer_init(&msg);
432 buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
433 buffer_put_string(&msg, blob, blen);
434 buffer_put_string(&msg, data, datalen);
Damien Miller62cee002000-09-23 17:15:56 +1100435 buffer_put_int(&msg, flags);
Damien Millerad833b32000-08-23 10:46:23 +1000436 xfree(blob);
437
438 if (ssh_request_reply(auth, &msg, &msg) == 0) {
439 buffer_free(&msg);
440 return -1;
441 }
442 type = buffer_get_char(&msg);
Damien Miller874d77b2000-10-14 16:23:11 +1100443 if (agent_failed(type)) {
Damien Miller996acd22003-04-09 20:59:48 +1000444 logit("Agent admitted failure to sign using the key.");
Damien Millerad833b32000-08-23 10:46:23 +1000445 } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
446 fatal("Bad authentication response: %d", type);
447 } else {
448 ret = 0;
449 *sigp = buffer_get_string(&msg, lenp);
450 }
451 buffer_free(&msg);
452 return ret;
453}
454
Damien Miller994cf142000-07-21 10:19:44 +1000455/* Encode key for a message to the agent. */
456
Ben Lindstrombba81212001-06-25 05:01:22 +0000457static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100458ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000459{
Damien Miller994cf142000-07-21 10:19:44 +1000460 buffer_put_int(b, BN_num_bits(key->n));
461 buffer_put_bignum(b, key->n);
462 buffer_put_bignum(b, key->e);
463 buffer_put_bignum(b, key->d);
464 /* To keep within the protocol: p < q for ssh. in SSL p > q */
465 buffer_put_bignum(b, key->iqmp); /* ssh key->u */
466 buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */
467 buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */
Ben Lindstrom664408d2001-06-09 01:42:01 +0000468 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000469}
470
Ben Lindstrombba81212001-06-25 05:01:22 +0000471static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100472ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000473{
Damien Miller0bc1bd82000-11-13 22:57:25 +1100474 buffer_put_cstring(b, key_ssh_name(key));
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000475 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100476 case KEY_RSA:
477 buffer_put_bignum2(b, key->rsa->n);
478 buffer_put_bignum2(b, key->rsa->e);
479 buffer_put_bignum2(b, key->rsa->d);
480 buffer_put_bignum2(b, key->rsa->iqmp);
481 buffer_put_bignum2(b, key->rsa->p);
482 buffer_put_bignum2(b, key->rsa->q);
483 break;
484 case KEY_DSA:
485 buffer_put_bignum2(b, key->dsa->p);
486 buffer_put_bignum2(b, key->dsa->q);
487 buffer_put_bignum2(b, key->dsa->g);
488 buffer_put_bignum2(b, key->dsa->pub_key);
489 buffer_put_bignum2(b, key->dsa->priv_key);
490 break;
491 }
492 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000493}
494
Damien Miller5428f641999-11-25 11:54:57 +1100495/*
496 * Adds an identity to the authentication server. This call is not meant to
497 * be used by normal applications.
498 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000499
Damien Miller4af51302000-04-16 11:18:38 +1000500int
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000501ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key,
Damien Miller6c711792003-01-24 11:36:23 +1100502 const char *comment, u_int life, u_int confirm)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000503{
Damien Millerad833b32000-08-23 10:46:23 +1000504 Buffer msg;
Damien Miller6c711792003-01-24 11:36:23 +1100505 int type, constrained = (life || confirm);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000506
Damien Millerad833b32000-08-23 10:46:23 +1000507 buffer_init(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000508
509 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100510 case KEY_RSA1:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000511 type = constrained ?
512 SSH_AGENTC_ADD_RSA_ID_CONSTRAINED :
513 SSH_AGENTC_ADD_RSA_IDENTITY;
514 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100515 ssh_encode_identity_rsa1(&msg, key->rsa, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000516 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100517 case KEY_RSA:
Damien Miller994cf142000-07-21 10:19:44 +1000518 case KEY_DSA:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000519 type = constrained ?
520 SSH2_AGENTC_ADD_ID_CONSTRAINED :
521 SSH2_AGENTC_ADD_IDENTITY;
522 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100523 ssh_encode_identity_ssh2(&msg, key, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000524 break;
525 default:
Damien Millerad833b32000-08-23 10:46:23 +1000526 buffer_free(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000527 return 0;
528 break;
529 }
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000530 if (constrained) {
531 if (life != 0) {
532 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
533 buffer_put_int(&msg, life);
534 }
Damien Miller6c711792003-01-24 11:36:23 +1100535 if (confirm != 0)
536 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000537 }
Damien Millerad833b32000-08-23 10:46:23 +1000538 if (ssh_request_reply(auth, &msg, &msg) == 0) {
539 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100540 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000541 }
Damien Millerad833b32000-08-23 10:46:23 +1000542 type = buffer_get_char(&msg);
543 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000544 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100545}
546
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000547int
548ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment)
549{
Damien Miller6c711792003-01-24 11:36:23 +1100550 return ssh_add_identity_constrained(auth, key, comment, 0, 0);
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000551}
552
Damien Miller5428f641999-11-25 11:54:57 +1100553/*
554 * Removes an identity from the authentication server. This call is not
555 * meant to be used by normal applications.
556 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000557
Damien Miller4af51302000-04-16 11:18:38 +1000558int
Damien Millerad833b32000-08-23 10:46:23 +1000559ssh_remove_identity(AuthenticationConnection *auth, Key *key)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000560{
Damien Millerad833b32000-08-23 10:46:23 +1000561 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000562 int type;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000563 u_char *blob;
564 u_int blen;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000565
Damien Millerad833b32000-08-23 10:46:23 +1000566 buffer_init(&msg);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000567
Damien Miller0bc1bd82000-11-13 22:57:25 +1100568 if (key->type == KEY_RSA1) {
Damien Millerad833b32000-08-23 10:46:23 +1000569 buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY);
570 buffer_put_int(&msg, BN_num_bits(key->rsa->n));
571 buffer_put_bignum(&msg, key->rsa->e);
572 buffer_put_bignum(&msg, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100573 } else if (key->type == KEY_DSA || key->type == KEY_RSA) {
574 key_to_blob(key, &blob, &blen);
Damien Millerad833b32000-08-23 10:46:23 +1000575 buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY);
576 buffer_put_string(&msg, blob, blen);
577 xfree(blob);
578 } else {
579 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100580 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000581 }
Damien Millerad833b32000-08-23 10:46:23 +1000582 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);
Damien Miller942da032000-08-18 13:59:06 +1000588 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100589}
590
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000591int
Damien Millerd94f20d2003-06-11 22:06:33 +1000592ssh_update_card(AuthenticationConnection *auth, int add,
593 const char *reader_id, const char *pin, u_int life, u_int confirm)
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000594{
595 Buffer msg;
Damien Millerd94f20d2003-06-11 22:06:33 +1000596 int type, constrained = (life || confirm);
597
598 if (add) {
599 type = constrained ?
600 SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
601 SSH_AGENTC_ADD_SMARTCARD_KEY;
602 } else
603 type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000604
605 buffer_init(&msg);
Damien Millerd94f20d2003-06-11 22:06:33 +1000606 buffer_put_char(&msg, type);
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000607 buffer_put_cstring(&msg, reader_id);
Ben Lindstromba72d302002-03-22 03:51:06 +0000608 buffer_put_cstring(&msg, pin);
Damien Millerd94f20d2003-06-11 22:06:33 +1000609
610 if (constrained) {
611 if (life != 0) {
612 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
613 buffer_put_int(&msg, life);
614 }
615 if (confirm != 0)
616 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
617 }
618
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000619 if (ssh_request_reply(auth, &msg, &msg) == 0) {
620 buffer_free(&msg);
621 return 0;
622 }
623 type = buffer_get_char(&msg);
624 buffer_free(&msg);
625 return decode_reply(type);
626}
627
Damien Miller5428f641999-11-25 11:54:57 +1100628/*
629 * Removes all identities from the agent. This call is not meant to be used
630 * by normal applications.
631 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000632
Damien Miller4af51302000-04-16 11:18:38 +1000633int
Damien Millerad833b32000-08-23 10:46:23 +1000634ssh_remove_all_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000635{
Damien Millerad833b32000-08-23 10:46:23 +1000636 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000637 int type;
Damien Millerad833b32000-08-23 10:46:23 +1000638 int code = (version==1) ?
639 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
640 SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000641
Damien Millerad833b32000-08-23 10:46:23 +1000642 buffer_init(&msg);
643 buffer_put_char(&msg, code);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000644
Damien Millerad833b32000-08-23 10:46:23 +1000645 if (ssh_request_reply(auth, &msg, &msg) == 0) {
646 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100647 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000648 }
Damien Millerad833b32000-08-23 10:46:23 +1000649 type = buffer_get_char(&msg);
650 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000651 return decode_reply(type);
652}
653
Kevin Stevesef4eea92001-02-05 12:42:17 +0000654int
Damien Miller942da032000-08-18 13:59:06 +1000655decode_reply(int type)
656{
Damien Miller95def091999-11-25 00:26:21 +1100657 switch (type) {
658 case SSH_AGENT_FAILURE:
Damien Miller874d77b2000-10-14 16:23:11 +1100659 case SSH_COM_AGENT2_FAILURE:
Ben Lindstromc9a26362001-08-15 23:04:50 +0000660 case SSH2_AGENT_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +1000661 logit("SSH_AGENT_FAILURE");
Damien Miller95def091999-11-25 00:26:21 +1100662 return 0;
663 case SSH_AGENT_SUCCESS:
Damien Miller95def091999-11-25 00:26:21 +1100664 return 1;
665 default:
Damien Miller37023962000-07-11 17:31:38 +1000666 fatal("Bad response from authentication agent: %d", type);
Damien Miller95def091999-11-25 00:26:21 +1100667 }
668 /* NOTREACHED */
669 return 0;
670}