blob: 78a53c7a621d858d3ec3bb44db16b562fb822108 [file] [log] [blame]
Darren Tucker893d7352009-10-07 08:47:02 +11001/* $OpenBSD: authfd.c,v 1.81 2009/08/27 17:44:52 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Functions for connecting the local authentication agent.
Damien Miller4af51302000-04-16 11:18:38 +10007 *
Damien Millere4340be2000-09-16 13:29:08 +11008 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
Damien Millerad833b32000-08-23 10:46:23 +100013 *
Damien Millere4340be2000-09-16 13:29:08 +110014 * SSH2 implementation,
15 * Copyright (c) 2000 Markus Friedl. All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110036 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
38#include "includes.h"
Damien Miller574c41f2006-03-15 11:40:10 +110039
40#include <sys/types.h>
41#include <sys/un.h>
Damien Millere3b60b52006-07-10 21:08:03 +100042#include <sys/socket.h>
Ben Lindstrom226cfa02001-01-22 05:34:40 +000043
44#include <openssl/evp.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100045
Damien Millerd7834352006-08-05 12:39:39 +100046#include <openssl/crypto.h>
Damien Miller57cf6382006-07-10 21:13:46 +100047#include <fcntl.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100048#include <stdlib.h>
Damien Millerd7834352006-08-05 12:39:39 +100049#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100050#include <stdarg.h>
Damien Millere3476ed2006-07-24 14:13:33 +100051#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100052#include <unistd.h>
Damien Miller57cf6382006-07-10 21:13:46 +100053
Damien Millerd7834352006-08-05 12:39:39 +100054#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100055#include "ssh.h"
56#include "rsa.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100057#include "buffer.h"
Damien Miller994cf142000-07-21 10:19:44 +100058#include "key.h"
59#include "authfd.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000060#include "cipher.h"
Damien Miller994cf142000-07-21 10:19:44 +100061#include "kex.h"
Damien Miller62cee002000-09-23 17:15:56 +110062#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000063#include "log.h"
64#include "atomicio.h"
Damien Miller3f941882006-03-31 23:13:02 +110065#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100066
Damien Miller789e95d2002-09-12 09:52:46 +100067static int agent_present = 0;
68
Damien Miller37023962000-07-11 17:31:38 +100069/* helper */
Damien Miller942da032000-08-18 13:59:06 +100070int decode_reply(int type);
Damien Miller37023962000-07-11 17:31:38 +100071
Damien Miller874d77b2000-10-14 16:23:11 +110072/* macro to check for "agent failure" message */
73#define agent_failed(x) \
Ben Lindstromc9a26362001-08-15 23:04:50 +000074 ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE) || \
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000075 (x == SSH2_AGENT_FAILURE))
Damien Miller874d77b2000-10-14 16:23:11 +110076
Damien Miller789e95d2002-09-12 09:52:46 +100077int
78ssh_agent_present(void)
79{
80 int authfd;
81
82 if (agent_present)
83 return 1;
84 if ((authfd = ssh_get_authentication_socket()) == -1)
85 return 0;
86 else {
87 ssh_close_authentication_socket(authfd);
88 return 1;
89 }
90}
91
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092/* Returns the number of the authentication fd, or -1 if there is none. */
93
94int
Ben Lindstrom46c16222000-12-22 01:43:59 +000095ssh_get_authentication_socket(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100096{
Damien Miller95def091999-11-25 00:26:21 +110097 const char *authsocket;
Ben Lindstromb1d822c2001-09-20 01:03:31 +000098 int sock;
Damien Miller95def091999-11-25 00:26:21 +110099 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100
Damien Miller95def091999-11-25 00:26:21 +1100101 authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
102 if (!authsocket)
103 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104
Damien Miller95def091999-11-25 00:26:21 +1100105 sunaddr.sun_family = AF_UNIX;
106 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
Damien Miller10f6f6b1999-11-17 17:29:08 +1100107
Damien Miller95def091999-11-25 00:26:21 +1100108 sock = socket(AF_UNIX, SOCK_STREAM, 0);
109 if (sock < 0)
110 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000111
Damien Miller95def091999-11-25 00:26:21 +1100112 /* close on exec */
113 if (fcntl(sock, F_SETFD, 1) == -1) {
114 close(sock);
115 return -1;
116 }
Damien Millerd62f2ca2006-03-26 13:57:41 +1100117 if (connect(sock, (struct sockaddr *)&sunaddr, sizeof sunaddr) < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100118 close(sock);
119 return -1;
120 }
Damien Miller789e95d2002-09-12 09:52:46 +1000121 agent_present = 1;
Damien Miller95def091999-11-25 00:26:21 +1100122 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000123}
124
Ben Lindstrombba81212001-06-25 05:01:22 +0000125static int
Damien Millerad833b32000-08-23 10:46:23 +1000126ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply)
Damien Miller942da032000-08-18 13:59:06 +1000127{
Damien Millereccb9de2005-06-17 12:59:34 +1000128 u_int l, len;
Damien Miller942da032000-08-18 13:59:06 +1000129 char buf[1024];
130
131 /* Get the length of the message, and format it in the buffer. */
132 len = buffer_len(request);
Damien Miller3f941882006-03-31 23:13:02 +1100133 put_u32(buf, len);
Damien Miller942da032000-08-18 13:59:06 +1000134
135 /* Send the length and then the packet to the agent. */
Darren Tucker9f63f222003-07-03 13:46:56 +1000136 if (atomicio(vwrite, auth->fd, buf, 4) != 4 ||
137 atomicio(vwrite, auth->fd, buffer_ptr(request),
Damien Miller942da032000-08-18 13:59:06 +1000138 buffer_len(request)) != buffer_len(request)) {
139 error("Error writing to authentication socket.");
140 return 0;
141 }
142 /*
143 * Wait for response from the agent. First read the length of the
144 * response packet.
145 */
Darren Tuckerfe6649d2004-08-13 21:19:37 +1000146 if (atomicio(read, auth->fd, buf, 4) != 4) {
147 error("Error reading response length from authentication socket.");
148 return 0;
Damien Miller942da032000-08-18 13:59:06 +1000149 }
150
151 /* Extract the length, and check it for sanity. */
Damien Miller3f941882006-03-31 23:13:02 +1100152 len = get_u32(buf);
Damien Miller942da032000-08-18 13:59:06 +1000153 if (len > 256 * 1024)
Darren Tuckerc0815c92003-09-22 21:05:50 +1000154 fatal("Authentication response too long: %u", len);
Damien Miller942da032000-08-18 13:59:06 +1000155
156 /* Read the rest of the response in to the buffer. */
157 buffer_clear(reply);
158 while (len > 0) {
159 l = len;
160 if (l > sizeof(buf))
161 l = sizeof(buf);
Damien Millerb253cc42005-05-26 12:23:44 +1000162 if (atomicio(read, auth->fd, buf, l) != l) {
Damien Miller942da032000-08-18 13:59:06 +1000163 error("Error reading response from authentication socket.");
164 return 0;
165 }
Ben Lindstrom6398a0e2002-06-25 23:22:54 +0000166 buffer_append(reply, buf, l);
Damien Miller942da032000-08-18 13:59:06 +1000167 len -= l;
168 }
169 return 1;
170}
171
Damien Miller5428f641999-11-25 11:54:57 +1100172/*
173 * Closes the agent socket if it should be closed (depends on how it was
174 * obtained). The argument must have been returned by
175 * ssh_get_authentication_socket().
176 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000177
Damien Miller4af51302000-04-16 11:18:38 +1000178void
Damien Miller95def091999-11-25 00:26:21 +1100179ssh_close_authentication_socket(int sock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000180{
Damien Miller95def091999-11-25 00:26:21 +1100181 if (getenv(SSH_AUTHSOCKET_ENV_NAME))
182 close(sock);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000183}
184
Damien Miller5428f641999-11-25 11:54:57 +1100185/*
186 * Opens and connects a private socket for communication with the
187 * authentication agent. Returns the file descriptor (which must be
188 * shut down and closed by the caller when no longer needed).
189 * Returns NULL if an error occurred and the connection could not be
190 * opened.
191 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000192
Damien Miller95def091999-11-25 00:26:21 +1100193AuthenticationConnection *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000194ssh_get_authentication_connection(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195{
Damien Miller95def091999-11-25 00:26:21 +1100196 AuthenticationConnection *auth;
197 int sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000198
Damien Miller95def091999-11-25 00:26:21 +1100199 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000200
Damien Miller5428f641999-11-25 11:54:57 +1100201 /*
202 * Fail if we couldn't obtain a connection. This happens if we
203 * exited due to a timeout.
204 */
Damien Miller95def091999-11-25 00:26:21 +1100205 if (sock < 0)
206 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000207
Damien Miller95def091999-11-25 00:26:21 +1100208 auth = xmalloc(sizeof(*auth));
209 auth->fd = sock;
Damien Miller95def091999-11-25 00:26:21 +1100210 buffer_init(&auth->identities);
211 auth->howmany = 0;
212
213 return auth;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000214}
215
Damien Miller5428f641999-11-25 11:54:57 +1100216/*
217 * Closes the connection to the authentication agent and frees any associated
218 * memory.
219 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000220
Damien Miller4af51302000-04-16 11:18:38 +1000221void
Damien Millerad833b32000-08-23 10:46:23 +1000222ssh_close_authentication_connection(AuthenticationConnection *auth)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000223{
Damien Millerad833b32000-08-23 10:46:23 +1000224 buffer_free(&auth->identities);
225 close(auth->fd);
226 xfree(auth);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000227}
228
Ben Lindstrom2f717042002-06-06 21:52:03 +0000229/* Lock/unlock agent */
230int
231ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password)
232{
233 int type;
234 Buffer msg;
235
236 buffer_init(&msg);
237 buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK);
238 buffer_put_cstring(&msg, password);
239
240 if (ssh_request_reply(auth, &msg, &msg) == 0) {
241 buffer_free(&msg);
242 return 0;
243 }
244 type = buffer_get_char(&msg);
245 buffer_free(&msg);
246 return decode_reply(type);
247}
248
Damien Miller5428f641999-11-25 11:54:57 +1100249/*
250 * Returns the first authentication identity held by the agent.
Damien Miller5428f641999-11-25 11:54:57 +1100251 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000252
Damien Miller0bc1bd82000-11-13 22:57:25 +1100253int
254ssh_get_num_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000255{
Damien Millerad833b32000-08-23 10:46:23 +1000256 int type, code1 = 0, code2 = 0;
Damien Miller942da032000-08-18 13:59:06 +1000257 Buffer request;
Damien Millerad833b32000-08-23 10:46:23 +1000258
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000259 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000260 case 1:
261 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
262 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
263 break;
264 case 2:
265 code1 = SSH2_AGENTC_REQUEST_IDENTITIES;
266 code2 = SSH2_AGENT_IDENTITIES_ANSWER;
267 break;
268 default:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100269 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000270 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000271
Damien Miller5428f641999-11-25 11:54:57 +1100272 /*
273 * Send a message to the agent requesting for a list of the
274 * identities it can represent.
275 */
Damien Miller942da032000-08-18 13:59:06 +1000276 buffer_init(&request);
Damien Millerad833b32000-08-23 10:46:23 +1000277 buffer_put_char(&request, code1);
Damien Miller942da032000-08-18 13:59:06 +1000278
279 buffer_clear(&auth->identities);
280 if (ssh_request_reply(auth, &request, &auth->identities) == 0) {
281 buffer_free(&request);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100282 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000283 }
Damien Miller942da032000-08-18 13:59:06 +1000284 buffer_free(&request);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000285
Damien Miller95def091999-11-25 00:26:21 +1100286 /* Get message type, and verify that we got a proper answer. */
Damien Miller942da032000-08-18 13:59:06 +1000287 type = buffer_get_char(&auth->identities);
Damien Miller874d77b2000-10-14 16:23:11 +1100288 if (agent_failed(type)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100289 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000290 } else if (type != code2) {
Damien Miller942da032000-08-18 13:59:06 +1000291 fatal("Bad authentication reply message type: %d", type);
Damien Millerad833b32000-08-23 10:46:23 +1000292 }
Damien Miller95def091999-11-25 00:26:21 +1100293
294 /* Get the number of entries in the response and check it for sanity. */
295 auth->howmany = buffer_get_int(&auth->identities);
Darren Tuckerc0815c92003-09-22 21:05:50 +1000296 if ((u_int)auth->howmany > 1024)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000297 fatal("Too many identities in authentication reply: %d",
Damien Miller942da032000-08-18 13:59:06 +1000298 auth->howmany);
Damien Miller95def091999-11-25 00:26:21 +1100299
Damien Miller0bc1bd82000-11-13 22:57:25 +1100300 return auth->howmany;
301}
302
303Key *
304ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version)
305{
306 /* get number of identities and return the first entry (if any). */
307 if (ssh_get_num_identities(auth, version) > 0)
308 return ssh_get_next_identity(auth, comment, version);
309 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000310}
311
Damien Millerad833b32000-08-23 10:46:23 +1000312Key *
313ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000314{
Damien Millereccb9de2005-06-17 12:59:34 +1000315 int keybits;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000316 u_int bits;
317 u_char *blob;
318 u_int blen;
Damien Millerad833b32000-08-23 10:46:23 +1000319 Key *key = NULL;
Damien Miller7e8e8201999-11-16 13:37:16 +1100320
Damien Miller95def091999-11-25 00:26:21 +1100321 /* Return failure if no more entries. */
322 if (auth->howmany <= 0)
Damien Millerad833b32000-08-23 10:46:23 +1000323 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000324
Damien Miller5428f641999-11-25 11:54:57 +1100325 /*
326 * Get the next entry from the packet. These will abort with a fatal
327 * error if the packet is too short or contains corrupt data.
328 */
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000329 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000330 case 1:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100331 key = key_new(KEY_RSA1);
Damien Millerad833b32000-08-23 10:46:23 +1000332 bits = buffer_get_int(&auth->identities);
333 buffer_get_bignum(&auth->identities, key->rsa->e);
334 buffer_get_bignum(&auth->identities, key->rsa->n);
335 *comment = buffer_get_string(&auth->identities, NULL);
Damien Millereccb9de2005-06-17 12:59:34 +1000336 keybits = BN_num_bits(key->rsa->n);
337 if (keybits < 0 || bits != (u_int)keybits)
Damien Miller996acd22003-04-09 20:59:48 +1000338 logit("Warning: identity keysize mismatch: actual %d, announced %u",
Damien Millerad833b32000-08-23 10:46:23 +1000339 BN_num_bits(key->rsa->n), bits);
340 break;
341 case 2:
342 blob = buffer_get_string(&auth->identities, &blen);
343 *comment = buffer_get_string(&auth->identities, NULL);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100344 key = key_from_blob(blob, blen);
Damien Millerad833b32000-08-23 10:46:23 +1000345 xfree(blob);
346 break;
347 default:
348 return NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000349 }
Damien Miller95def091999-11-25 00:26:21 +1100350 /* Decrement the number of remaining entries. */
351 auth->howmany--;
Damien Millerad833b32000-08-23 10:46:23 +1000352 return key;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000353}
354
Damien Miller5428f641999-11-25 11:54:57 +1100355/*
356 * Generates a random challenge, sends it to the agent, and waits for
357 * response from the agent. Returns true (non-zero) if the agent gave the
358 * correct answer, zero otherwise. Response type selects the style of
359 * response desired, with 0 corresponding to protocol version 1.0 (no longer
360 * supported) and 1 corresponding to protocol version 1.1.
361 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000362
363int
364ssh_decrypt_challenge(AuthenticationConnection *auth,
Damien Millerad833b32000-08-23 10:46:23 +1000365 Key* key, BIGNUM *challenge,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000366 u_char session_id[16],
367 u_int response_type,
368 u_char response[16])
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000369{
Damien Miller95def091999-11-25 00:26:21 +1100370 Buffer buffer;
Damien Miller942da032000-08-18 13:59:06 +1000371 int success = 0;
372 int i;
373 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000374
Damien Miller0bc1bd82000-11-13 22:57:25 +1100375 if (key->type != KEY_RSA1)
Damien Millerad833b32000-08-23 10:46:23 +1000376 return 0;
377 if (response_type == 0) {
Damien Miller996acd22003-04-09 20:59:48 +1000378 logit("Compatibility with ssh protocol version 1.0 no longer supported.");
Damien Millerad833b32000-08-23 10:46:23 +1000379 return 0;
380 }
Damien Miller95def091999-11-25 00:26:21 +1100381 buffer_init(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000382 buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE);
Damien Millerad833b32000-08-23 10:46:23 +1000383 buffer_put_int(&buffer, BN_num_bits(key->rsa->n));
384 buffer_put_bignum(&buffer, key->rsa->e);
385 buffer_put_bignum(&buffer, key->rsa->n);
Damien Miller95def091999-11-25 00:26:21 +1100386 buffer_put_bignum(&buffer, challenge);
Damien Miller4a8ed542002-01-22 23:33:31 +1100387 buffer_append(&buffer, session_id, 16);
Damien Miller95def091999-11-25 00:26:21 +1100388 buffer_put_int(&buffer, response_type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000389
Damien Miller942da032000-08-18 13:59:06 +1000390 if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
Damien Miller95def091999-11-25 00:26:21 +1100391 buffer_free(&buffer);
392 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000393 }
Damien Miller942da032000-08-18 13:59:06 +1000394 type = buffer_get_char(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000395
Damien Miller874d77b2000-10-14 16:23:11 +1100396 if (agent_failed(type)) {
Damien Miller996acd22003-04-09 20:59:48 +1000397 logit("Agent admitted failure to authenticate using the key.");
Damien Miller942da032000-08-18 13:59:06 +1000398 } else if (type != SSH_AGENT_RSA_RESPONSE) {
399 fatal("Bad authentication response: %d", type);
400 } else {
401 success = 1;
402 /*
403 * Get the response from the packet. This will abort with a
404 * fatal error if the packet is corrupt.
405 */
406 for (i = 0; i < 16; i++)
Damien Miller8ba29fe2006-03-26 14:25:19 +1100407 response[i] = (u_char)buffer_get_char(&buffer);
Damien Miller95def091999-11-25 00:26:21 +1100408 }
Damien Miller95def091999-11-25 00:26:21 +1100409 buffer_free(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000410 return success;
Damien Miller95def091999-11-25 00:26:21 +1100411}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000412
Damien Millerad833b32000-08-23 10:46:23 +1000413/* ask agent to sign data, returns -1 on error, 0 on success */
414int
415ssh_agent_sign(AuthenticationConnection *auth,
416 Key *key,
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000417 u_char **sigp, u_int *lenp,
418 u_char *data, u_int datalen)
Damien Millerad833b32000-08-23 10:46:23 +1000419{
Damien Miller62cee002000-09-23 17:15:56 +1100420 extern int datafellows;
Damien Millerad833b32000-08-23 10:46:23 +1000421 Buffer msg;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000422 u_char *blob;
423 u_int blen;
Damien Miller62cee002000-09-23 17:15:56 +1100424 int type, flags = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000425 int ret = -1;
426
Damien Miller0bc1bd82000-11-13 22:57:25 +1100427 if (key_to_blob(key, &blob, &blen) == 0)
Damien Millerad833b32000-08-23 10:46:23 +1000428 return -1;
429
Damien Miller62cee002000-09-23 17:15:56 +1100430 if (datafellows & SSH_BUG_SIGBLOB)
431 flags = SSH_AGENT_OLD_SIGNATURE;
432
Damien Millerad833b32000-08-23 10:46:23 +1000433 buffer_init(&msg);
434 buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
435 buffer_put_string(&msg, blob, blen);
436 buffer_put_string(&msg, data, datalen);
Damien Miller62cee002000-09-23 17:15:56 +1100437 buffer_put_int(&msg, flags);
Damien Millerad833b32000-08-23 10:46:23 +1000438 xfree(blob);
439
440 if (ssh_request_reply(auth, &msg, &msg) == 0) {
441 buffer_free(&msg);
442 return -1;
443 }
444 type = buffer_get_char(&msg);
Damien Miller874d77b2000-10-14 16:23:11 +1100445 if (agent_failed(type)) {
Damien Miller996acd22003-04-09 20:59:48 +1000446 logit("Agent admitted failure to sign using the key.");
Damien Millerad833b32000-08-23 10:46:23 +1000447 } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
448 fatal("Bad authentication response: %d", type);
449 } else {
450 ret = 0;
451 *sigp = buffer_get_string(&msg, lenp);
452 }
453 buffer_free(&msg);
454 return ret;
455}
456
Damien Miller994cf142000-07-21 10:19:44 +1000457/* Encode key for a message to the agent. */
458
Ben Lindstrombba81212001-06-25 05:01:22 +0000459static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100460ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000461{
Damien Miller994cf142000-07-21 10:19:44 +1000462 buffer_put_int(b, BN_num_bits(key->n));
463 buffer_put_bignum(b, key->n);
464 buffer_put_bignum(b, key->e);
465 buffer_put_bignum(b, key->d);
466 /* To keep within the protocol: p < q for ssh. in SSL p > q */
467 buffer_put_bignum(b, key->iqmp); /* ssh key->u */
468 buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */
469 buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */
Ben Lindstrom664408d2001-06-09 01:42:01 +0000470 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000471}
472
Ben Lindstrombba81212001-06-25 05:01:22 +0000473static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100474ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000475{
Damien Miller0bc1bd82000-11-13 22:57:25 +1100476 buffer_put_cstring(b, key_ssh_name(key));
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000477 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100478 case KEY_RSA:
479 buffer_put_bignum2(b, key->rsa->n);
480 buffer_put_bignum2(b, key->rsa->e);
481 buffer_put_bignum2(b, key->rsa->d);
482 buffer_put_bignum2(b, key->rsa->iqmp);
483 buffer_put_bignum2(b, key->rsa->p);
484 buffer_put_bignum2(b, key->rsa->q);
485 break;
486 case KEY_DSA:
487 buffer_put_bignum2(b, key->dsa->p);
488 buffer_put_bignum2(b, key->dsa->q);
489 buffer_put_bignum2(b, key->dsa->g);
490 buffer_put_bignum2(b, key->dsa->pub_key);
491 buffer_put_bignum2(b, key->dsa->priv_key);
492 break;
493 }
494 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000495}
496
Damien Miller5428f641999-11-25 11:54:57 +1100497/*
498 * Adds an identity to the authentication server. This call is not meant to
499 * be used by normal applications.
500 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000501
Damien Miller4af51302000-04-16 11:18:38 +1000502int
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000503ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key,
Damien Miller6c711792003-01-24 11:36:23 +1100504 const char *comment, u_int life, u_int confirm)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000505{
Damien Millerad833b32000-08-23 10:46:23 +1000506 Buffer msg;
Damien Miller6c711792003-01-24 11:36:23 +1100507 int type, constrained = (life || confirm);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000508
Damien Millerad833b32000-08-23 10:46:23 +1000509 buffer_init(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000510
511 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100512 case KEY_RSA1:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000513 type = constrained ?
514 SSH_AGENTC_ADD_RSA_ID_CONSTRAINED :
515 SSH_AGENTC_ADD_RSA_IDENTITY;
516 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100517 ssh_encode_identity_rsa1(&msg, key->rsa, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000518 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100519 case KEY_RSA:
Damien Miller994cf142000-07-21 10:19:44 +1000520 case KEY_DSA:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000521 type = constrained ?
522 SSH2_AGENTC_ADD_ID_CONSTRAINED :
523 SSH2_AGENTC_ADD_IDENTITY;
524 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100525 ssh_encode_identity_ssh2(&msg, key, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000526 break;
527 default:
Damien Millerad833b32000-08-23 10:46:23 +1000528 buffer_free(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000529 return 0;
Damien Miller994cf142000-07-21 10:19:44 +1000530 }
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000531 if (constrained) {
532 if (life != 0) {
533 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
534 buffer_put_int(&msg, life);
535 }
Damien Miller6c711792003-01-24 11:36:23 +1100536 if (confirm != 0)
537 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000538 }
Damien Millerad833b32000-08-23 10:46:23 +1000539 if (ssh_request_reply(auth, &msg, &msg) == 0) {
540 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100541 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000542 }
Damien Millerad833b32000-08-23 10:46:23 +1000543 type = buffer_get_char(&msg);
544 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000545 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100546}
547
Damien Miller5428f641999-11-25 11:54:57 +1100548/*
549 * Removes an identity from the authentication server. This call is not
550 * meant to be used by normal applications.
551 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000552
Damien Miller4af51302000-04-16 11:18:38 +1000553int
Damien Millerad833b32000-08-23 10:46:23 +1000554ssh_remove_identity(AuthenticationConnection *auth, Key *key)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000555{
Damien Millerad833b32000-08-23 10:46:23 +1000556 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000557 int type;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000558 u_char *blob;
559 u_int blen;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000560
Damien Millerad833b32000-08-23 10:46:23 +1000561 buffer_init(&msg);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000562
Damien Miller0bc1bd82000-11-13 22:57:25 +1100563 if (key->type == KEY_RSA1) {
Damien Millerad833b32000-08-23 10:46:23 +1000564 buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY);
565 buffer_put_int(&msg, BN_num_bits(key->rsa->n));
566 buffer_put_bignum(&msg, key->rsa->e);
567 buffer_put_bignum(&msg, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100568 } else if (key->type == KEY_DSA || key->type == KEY_RSA) {
569 key_to_blob(key, &blob, &blen);
Damien Millerad833b32000-08-23 10:46:23 +1000570 buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY);
571 buffer_put_string(&msg, blob, blen);
572 xfree(blob);
573 } else {
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 if (ssh_request_reply(auth, &msg, &msg) == 0) {
578 buffer_free(&msg);
579 return 0;
580 }
581 type = buffer_get_char(&msg);
582 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000583 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100584}
585
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000586int
Damien Millera8e06ce2003-11-21 23:48:55 +1100587ssh_update_card(AuthenticationConnection *auth, int add,
Damien Millerd94f20d2003-06-11 22:06:33 +1000588 const char *reader_id, const char *pin, u_int life, u_int confirm)
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000589{
590 Buffer msg;
Damien Millerd94f20d2003-06-11 22:06:33 +1000591 int type, constrained = (life || confirm);
592
593 if (add) {
594 type = constrained ?
595 SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
596 SSH_AGENTC_ADD_SMARTCARD_KEY;
597 } else
598 type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000599
600 buffer_init(&msg);
Damien Millerd94f20d2003-06-11 22:06:33 +1000601 buffer_put_char(&msg, type);
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000602 buffer_put_cstring(&msg, reader_id);
Ben Lindstromba72d302002-03-22 03:51:06 +0000603 buffer_put_cstring(&msg, pin);
Damien Miller787b2ec2003-11-21 23:56:47 +1100604
Damien Millerd94f20d2003-06-11 22:06:33 +1000605 if (constrained) {
606 if (life != 0) {
607 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
608 buffer_put_int(&msg, life);
609 }
610 if (confirm != 0)
611 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
612 }
613
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000614 if (ssh_request_reply(auth, &msg, &msg) == 0) {
615 buffer_free(&msg);
616 return 0;
617 }
618 type = buffer_get_char(&msg);
619 buffer_free(&msg);
620 return decode_reply(type);
621}
622
Damien Miller5428f641999-11-25 11:54:57 +1100623/*
624 * Removes all identities from the agent. This call is not meant to be used
625 * by normal applications.
626 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000627
Damien Miller4af51302000-04-16 11:18:38 +1000628int
Damien Millerad833b32000-08-23 10:46:23 +1000629ssh_remove_all_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000630{
Damien Millerad833b32000-08-23 10:46:23 +1000631 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000632 int type;
Damien Millerad833b32000-08-23 10:46:23 +1000633 int code = (version==1) ?
634 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
635 SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000636
Damien Millerad833b32000-08-23 10:46:23 +1000637 buffer_init(&msg);
638 buffer_put_char(&msg, code);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000639
Damien Millerad833b32000-08-23 10:46:23 +1000640 if (ssh_request_reply(auth, &msg, &msg) == 0) {
641 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100642 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000643 }
Damien Millerad833b32000-08-23 10:46:23 +1000644 type = buffer_get_char(&msg);
645 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000646 return decode_reply(type);
647}
648
Kevin Stevesef4eea92001-02-05 12:42:17 +0000649int
Damien Miller942da032000-08-18 13:59:06 +1000650decode_reply(int type)
651{
Damien Miller95def091999-11-25 00:26:21 +1100652 switch (type) {
653 case SSH_AGENT_FAILURE:
Damien Miller874d77b2000-10-14 16:23:11 +1100654 case SSH_COM_AGENT2_FAILURE:
Ben Lindstromc9a26362001-08-15 23:04:50 +0000655 case SSH2_AGENT_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +1000656 logit("SSH_AGENT_FAILURE");
Damien Miller95def091999-11-25 00:26:21 +1100657 return 0;
658 case SSH_AGENT_SUCCESS:
Damien Miller95def091999-11-25 00:26:21 +1100659 return 1;
660 default:
Damien Miller37023962000-07-11 17:31:38 +1000661 fatal("Bad response from authentication agent: %d", type);
Damien Miller95def091999-11-25 00:26:21 +1100662 }
663 /* NOTREACHED */
664 return 0;
665}