blob: 2d5a8dd5bb490c3a2f8909b869668cede0a4a434 [file] [log] [blame]
Damien Miller1f0311c2014-05-15 14:24:09 +10001/* $OpenBSD: authfd.c,v 1.93 2014/04/29 18:01:49 markus 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
Damien Miller57cf6382006-07-10 21:13:46 +100044#include <fcntl.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100045#include <stdlib.h>
Damien Millerd7834352006-08-05 12:39:39 +100046#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100047#include <stdarg.h>
Damien Millere3476ed2006-07-24 14:13:33 +100048#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100049#include <unistd.h>
Damien Miller57cf6382006-07-10 21:13:46 +100050
Damien Millerd7834352006-08-05 12:39:39 +100051#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100052#include "ssh.h"
53#include "rsa.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100054#include "buffer.h"
Damien Miller994cf142000-07-21 10:19:44 +100055#include "key.h"
56#include "authfd.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000057#include "cipher.h"
Damien Miller994cf142000-07-21 10:19:44 +100058#include "kex.h"
Damien Miller62cee002000-09-23 17:15:56 +110059#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000060#include "log.h"
61#include "atomicio.h"
Damien Miller3f941882006-03-31 23:13:02 +110062#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100063
Damien Miller789e95d2002-09-12 09:52:46 +100064static int agent_present = 0;
65
Damien Miller37023962000-07-11 17:31:38 +100066/* helper */
Damien Miller942da032000-08-18 13:59:06 +100067int decode_reply(int type);
Damien Miller37023962000-07-11 17:31:38 +100068
Damien Miller874d77b2000-10-14 16:23:11 +110069/* macro to check for "agent failure" message */
70#define agent_failed(x) \
Ben Lindstromc9a26362001-08-15 23:04:50 +000071 ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE) || \
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000072 (x == SSH2_AGENT_FAILURE))
Damien Miller874d77b2000-10-14 16:23:11 +110073
Damien Miller789e95d2002-09-12 09:52:46 +100074int
75ssh_agent_present(void)
76{
77 int authfd;
78
79 if (agent_present)
80 return 1;
81 if ((authfd = ssh_get_authentication_socket()) == -1)
82 return 0;
83 else {
84 ssh_close_authentication_socket(authfd);
85 return 1;
86 }
87}
88
Damien Millerd4a8b7e1999-10-27 13:42:43 +100089/* Returns the number of the authentication fd, or -1 if there is none. */
90
91int
Ben Lindstrom46c16222000-12-22 01:43:59 +000092ssh_get_authentication_socket(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100093{
Damien Miller95def091999-11-25 00:26:21 +110094 const char *authsocket;
Ben Lindstromb1d822c2001-09-20 01:03:31 +000095 int sock;
Damien Miller95def091999-11-25 00:26:21 +110096 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100097
Damien Miller95def091999-11-25 00:26:21 +110098 authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
99 if (!authsocket)
100 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000101
Damien Miller1d2c4562014-02-04 11:18:20 +1100102 memset(&sunaddr, 0, sizeof(sunaddr));
Damien Miller95def091999-11-25 00:26:21 +1100103 sunaddr.sun_family = AF_UNIX;
104 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
Damien Miller10f6f6b1999-11-17 17:29:08 +1100105
Damien Miller95def091999-11-25 00:26:21 +1100106 sock = socket(AF_UNIX, SOCK_STREAM, 0);
107 if (sock < 0)
108 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000109
Damien Miller95def091999-11-25 00:26:21 +1100110 /* close on exec */
Damien Miller814ace02011-05-20 19:02:47 +1000111 if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1) {
Damien Miller95def091999-11-25 00:26:21 +1100112 close(sock);
113 return -1;
114 }
Damien Millerd62f2ca2006-03-26 13:57:41 +1100115 if (connect(sock, (struct sockaddr *)&sunaddr, sizeof sunaddr) < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100116 close(sock);
117 return -1;
118 }
Damien Miller789e95d2002-09-12 09:52:46 +1000119 agent_present = 1;
Damien Miller95def091999-11-25 00:26:21 +1100120 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000121}
122
Ben Lindstrombba81212001-06-25 05:01:22 +0000123static int
Damien Millerad833b32000-08-23 10:46:23 +1000124ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply)
Damien Miller942da032000-08-18 13:59:06 +1000125{
Damien Millereccb9de2005-06-17 12:59:34 +1000126 u_int l, len;
Damien Miller942da032000-08-18 13:59:06 +1000127 char buf[1024];
128
129 /* Get the length of the message, and format it in the buffer. */
130 len = buffer_len(request);
Damien Miller3f941882006-03-31 23:13:02 +1100131 put_u32(buf, len);
Damien Miller942da032000-08-18 13:59:06 +1000132
133 /* Send the length and then the packet to the agent. */
Darren Tucker9f63f222003-07-03 13:46:56 +1000134 if (atomicio(vwrite, auth->fd, buf, 4) != 4 ||
135 atomicio(vwrite, auth->fd, buffer_ptr(request),
Damien Miller942da032000-08-18 13:59:06 +1000136 buffer_len(request)) != buffer_len(request)) {
137 error("Error writing to authentication socket.");
138 return 0;
139 }
140 /*
141 * Wait for response from the agent. First read the length of the
142 * response packet.
143 */
Darren Tuckerfe6649d2004-08-13 21:19:37 +1000144 if (atomicio(read, auth->fd, buf, 4) != 4) {
145 error("Error reading response length from authentication socket.");
146 return 0;
Damien Miller942da032000-08-18 13:59:06 +1000147 }
148
149 /* Extract the length, and check it for sanity. */
Damien Miller3f941882006-03-31 23:13:02 +1100150 len = get_u32(buf);
Damien Miller942da032000-08-18 13:59:06 +1000151 if (len > 256 * 1024)
Darren Tuckerc0815c92003-09-22 21:05:50 +1000152 fatal("Authentication response too long: %u", len);
Damien Miller942da032000-08-18 13:59:06 +1000153
154 /* Read the rest of the response in to the buffer. */
155 buffer_clear(reply);
156 while (len > 0) {
157 l = len;
158 if (l > sizeof(buf))
159 l = sizeof(buf);
Damien Millerb253cc42005-05-26 12:23:44 +1000160 if (atomicio(read, auth->fd, buf, l) != l) {
Damien Miller942da032000-08-18 13:59:06 +1000161 error("Error reading response from authentication socket.");
162 return 0;
163 }
Ben Lindstrom6398a0e2002-06-25 23:22:54 +0000164 buffer_append(reply, buf, l);
Damien Miller942da032000-08-18 13:59:06 +1000165 len -= l;
166 }
167 return 1;
168}
169
Damien Miller5428f641999-11-25 11:54:57 +1100170/*
171 * Closes the agent socket if it should be closed (depends on how it was
172 * obtained). The argument must have been returned by
173 * ssh_get_authentication_socket().
174 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000175
Damien Miller4af51302000-04-16 11:18:38 +1000176void
Damien Miller95def091999-11-25 00:26:21 +1100177ssh_close_authentication_socket(int sock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000178{
Damien Miller95def091999-11-25 00:26:21 +1100179 if (getenv(SSH_AUTHSOCKET_ENV_NAME))
180 close(sock);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000181}
182
Damien Miller5428f641999-11-25 11:54:57 +1100183/*
184 * Opens and connects a private socket for communication with the
185 * authentication agent. Returns the file descriptor (which must be
186 * shut down and closed by the caller when no longer needed).
187 * Returns NULL if an error occurred and the connection could not be
188 * opened.
189 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000190
Damien Miller95def091999-11-25 00:26:21 +1100191AuthenticationConnection *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000192ssh_get_authentication_connection(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000193{
Damien Miller95def091999-11-25 00:26:21 +1100194 AuthenticationConnection *auth;
195 int sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000196
Damien Miller95def091999-11-25 00:26:21 +1100197 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000198
Damien Miller5428f641999-11-25 11:54:57 +1100199 /*
200 * Fail if we couldn't obtain a connection. This happens if we
201 * exited due to a timeout.
202 */
Damien Miller95def091999-11-25 00:26:21 +1100203 if (sock < 0)
204 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000205
Damien Miller6c81fee2013-11-08 12:19:55 +1100206 auth = xcalloc(1, sizeof(*auth));
Damien Miller95def091999-11-25 00:26:21 +1100207 auth->fd = sock;
Damien Miller95def091999-11-25 00:26:21 +1100208 buffer_init(&auth->identities);
209 auth->howmany = 0;
210
211 return auth;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000212}
213
Damien Miller5428f641999-11-25 11:54:57 +1100214/*
215 * Closes the connection to the authentication agent and frees any associated
216 * memory.
217 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000218
Damien Miller4af51302000-04-16 11:18:38 +1000219void
Damien Millerad833b32000-08-23 10:46:23 +1000220ssh_close_authentication_connection(AuthenticationConnection *auth)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000221{
Damien Millerad833b32000-08-23 10:46:23 +1000222 buffer_free(&auth->identities);
223 close(auth->fd);
Darren Tuckera627d422013-06-02 07:31:17 +1000224 free(auth);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000225}
226
Ben Lindstrom2f717042002-06-06 21:52:03 +0000227/* Lock/unlock agent */
228int
229ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password)
230{
231 int type;
232 Buffer msg;
233
234 buffer_init(&msg);
235 buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK);
236 buffer_put_cstring(&msg, password);
237
238 if (ssh_request_reply(auth, &msg, &msg) == 0) {
239 buffer_free(&msg);
240 return 0;
241 }
242 type = buffer_get_char(&msg);
243 buffer_free(&msg);
244 return decode_reply(type);
245}
246
Damien Miller5428f641999-11-25 11:54:57 +1100247/*
248 * Returns the first authentication identity held by the agent.
Damien Miller5428f641999-11-25 11:54:57 +1100249 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000250
Damien Miller0bc1bd82000-11-13 22:57:25 +1100251int
252ssh_get_num_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000253{
Damien Millerad833b32000-08-23 10:46:23 +1000254 int type, code1 = 0, code2 = 0;
Damien Miller942da032000-08-18 13:59:06 +1000255 Buffer request;
Damien Millerad833b32000-08-23 10:46:23 +1000256
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000257 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000258 case 1:
259 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
260 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
261 break;
262 case 2:
263 code1 = SSH2_AGENTC_REQUEST_IDENTITIES;
264 code2 = SSH2_AGENT_IDENTITIES_ANSWER;
265 break;
266 default:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100267 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000268 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000269
Damien Miller5428f641999-11-25 11:54:57 +1100270 /*
271 * Send a message to the agent requesting for a list of the
272 * identities it can represent.
273 */
Damien Miller942da032000-08-18 13:59:06 +1000274 buffer_init(&request);
Damien Millerad833b32000-08-23 10:46:23 +1000275 buffer_put_char(&request, code1);
Damien Miller942da032000-08-18 13:59:06 +1000276
277 buffer_clear(&auth->identities);
278 if (ssh_request_reply(auth, &request, &auth->identities) == 0) {
279 buffer_free(&request);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100280 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000281 }
Damien Miller942da032000-08-18 13:59:06 +1000282 buffer_free(&request);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000283
Damien Miller95def091999-11-25 00:26:21 +1100284 /* Get message type, and verify that we got a proper answer. */
Damien Miller942da032000-08-18 13:59:06 +1000285 type = buffer_get_char(&auth->identities);
Damien Miller874d77b2000-10-14 16:23:11 +1100286 if (agent_failed(type)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100287 return 0;
Damien Millerad833b32000-08-23 10:46:23 +1000288 } else if (type != code2) {
Damien Miller942da032000-08-18 13:59:06 +1000289 fatal("Bad authentication reply message type: %d", type);
Damien Millerad833b32000-08-23 10:46:23 +1000290 }
Damien Miller95def091999-11-25 00:26:21 +1100291
292 /* Get the number of entries in the response and check it for sanity. */
293 auth->howmany = buffer_get_int(&auth->identities);
Darren Tuckerc0815c92003-09-22 21:05:50 +1000294 if ((u_int)auth->howmany > 1024)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000295 fatal("Too many identities in authentication reply: %d",
Damien Miller942da032000-08-18 13:59:06 +1000296 auth->howmany);
Damien Miller95def091999-11-25 00:26:21 +1100297
Damien Miller0bc1bd82000-11-13 22:57:25 +1100298 return auth->howmany;
299}
300
301Key *
302ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version)
303{
304 /* get number of identities and return the first entry (if any). */
305 if (ssh_get_num_identities(auth, version) > 0)
306 return ssh_get_next_identity(auth, comment, version);
307 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000308}
309
Damien Millerad833b32000-08-23 10:46:23 +1000310Key *
311ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000312{
Damien Miller1f0311c2014-05-15 14:24:09 +1000313#ifdef WITH_SSH1
Damien Millereccb9de2005-06-17 12:59:34 +1000314 int keybits;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000315 u_int bits;
Damien Miller1f0311c2014-05-15 14:24:09 +1000316#endif
Ben Lindstrom46c16222000-12-22 01:43:59 +0000317 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 Miller1f0311c2014-05-15 14:24:09 +1000330#ifdef WITH_SSH1
Damien Millerad833b32000-08-23 10:46:23 +1000331 case 1:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100332 key = key_new(KEY_RSA1);
Damien Millerad833b32000-08-23 10:46:23 +1000333 bits = buffer_get_int(&auth->identities);
334 buffer_get_bignum(&auth->identities, key->rsa->e);
335 buffer_get_bignum(&auth->identities, key->rsa->n);
336 *comment = buffer_get_string(&auth->identities, NULL);
Damien Millereccb9de2005-06-17 12:59:34 +1000337 keybits = BN_num_bits(key->rsa->n);
338 if (keybits < 0 || bits != (u_int)keybits)
Damien Miller996acd22003-04-09 20:59:48 +1000339 logit("Warning: identity keysize mismatch: actual %d, announced %u",
Damien Millerad833b32000-08-23 10:46:23 +1000340 BN_num_bits(key->rsa->n), bits);
341 break;
Damien Miller1f0311c2014-05-15 14:24:09 +1000342#endif
Damien Millerad833b32000-08-23 10:46:23 +1000343 case 2:
344 blob = buffer_get_string(&auth->identities, &blen);
345 *comment = buffer_get_string(&auth->identities, NULL);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100346 key = key_from_blob(blob, blen);
Darren Tuckera627d422013-06-02 07:31:17 +1000347 free(blob);
Damien Millerad833b32000-08-23 10:46:23 +1000348 break;
349 default:
350 return NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000351 }
Damien Miller95def091999-11-25 00:26:21 +1100352 /* Decrement the number of remaining entries. */
353 auth->howmany--;
Damien Millerad833b32000-08-23 10:46:23 +1000354 return key;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000355}
356
Damien Miller5428f641999-11-25 11:54:57 +1100357/*
358 * Generates a random challenge, sends it to the agent, and waits for
359 * response from the agent. Returns true (non-zero) if the agent gave the
360 * correct answer, zero otherwise. Response type selects the style of
361 * response desired, with 0 corresponding to protocol version 1.0 (no longer
362 * supported) and 1 corresponding to protocol version 1.1.
363 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000364
Damien Miller1f0311c2014-05-15 14:24:09 +1000365#ifdef WITH_SSH1
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000366int
367ssh_decrypt_challenge(AuthenticationConnection *auth,
Damien Millerad833b32000-08-23 10:46:23 +1000368 Key* key, BIGNUM *challenge,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000369 u_char session_id[16],
370 u_int response_type,
371 u_char response[16])
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000372{
Damien Miller95def091999-11-25 00:26:21 +1100373 Buffer buffer;
Damien Miller942da032000-08-18 13:59:06 +1000374 int success = 0;
375 int i;
376 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000377
Damien Miller0bc1bd82000-11-13 22:57:25 +1100378 if (key->type != KEY_RSA1)
Damien Millerad833b32000-08-23 10:46:23 +1000379 return 0;
380 if (response_type == 0) {
Damien Miller996acd22003-04-09 20:59:48 +1000381 logit("Compatibility with ssh protocol version 1.0 no longer supported.");
Damien Millerad833b32000-08-23 10:46:23 +1000382 return 0;
383 }
Damien Miller95def091999-11-25 00:26:21 +1100384 buffer_init(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000385 buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE);
Damien Millerad833b32000-08-23 10:46:23 +1000386 buffer_put_int(&buffer, BN_num_bits(key->rsa->n));
387 buffer_put_bignum(&buffer, key->rsa->e);
388 buffer_put_bignum(&buffer, key->rsa->n);
Damien Miller95def091999-11-25 00:26:21 +1100389 buffer_put_bignum(&buffer, challenge);
Damien Miller4a8ed542002-01-22 23:33:31 +1100390 buffer_append(&buffer, session_id, 16);
Damien Miller95def091999-11-25 00:26:21 +1100391 buffer_put_int(&buffer, response_type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000392
Damien Miller942da032000-08-18 13:59:06 +1000393 if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
Damien Miller95def091999-11-25 00:26:21 +1100394 buffer_free(&buffer);
395 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000396 }
Damien Miller942da032000-08-18 13:59:06 +1000397 type = buffer_get_char(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000398
Damien Miller874d77b2000-10-14 16:23:11 +1100399 if (agent_failed(type)) {
Damien Miller996acd22003-04-09 20:59:48 +1000400 logit("Agent admitted failure to authenticate using the key.");
Damien Miller942da032000-08-18 13:59:06 +1000401 } else if (type != SSH_AGENT_RSA_RESPONSE) {
402 fatal("Bad authentication response: %d", type);
403 } else {
404 success = 1;
405 /*
406 * Get the response from the packet. This will abort with a
407 * fatal error if the packet is corrupt.
408 */
409 for (i = 0; i < 16; i++)
Damien Miller8ba29fe2006-03-26 14:25:19 +1100410 response[i] = (u_char)buffer_get_char(&buffer);
Damien Miller95def091999-11-25 00:26:21 +1100411 }
Damien Miller95def091999-11-25 00:26:21 +1100412 buffer_free(&buffer);
Damien Miller942da032000-08-18 13:59:06 +1000413 return success;
Damien Miller95def091999-11-25 00:26:21 +1100414}
Damien Miller1f0311c2014-05-15 14:24:09 +1000415#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000416
Damien Millerad833b32000-08-23 10:46:23 +1000417/* ask agent to sign data, returns -1 on error, 0 on success */
418int
419ssh_agent_sign(AuthenticationConnection *auth,
420 Key *key,
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000421 u_char **sigp, u_int *lenp,
422 u_char *data, u_int datalen)
Damien Millerad833b32000-08-23 10:46:23 +1000423{
Damien Miller62cee002000-09-23 17:15:56 +1100424 extern int datafellows;
Damien Millerad833b32000-08-23 10:46:23 +1000425 Buffer msg;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000426 u_char *blob;
427 u_int blen;
Damien Miller62cee002000-09-23 17:15:56 +1100428 int type, flags = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000429 int ret = -1;
430
Damien Miller0bc1bd82000-11-13 22:57:25 +1100431 if (key_to_blob(key, &blob, &blen) == 0)
Damien Millerad833b32000-08-23 10:46:23 +1000432 return -1;
433
Damien Miller62cee002000-09-23 17:15:56 +1100434 if (datafellows & SSH_BUG_SIGBLOB)
435 flags = SSH_AGENT_OLD_SIGNATURE;
436
Damien Millerad833b32000-08-23 10:46:23 +1000437 buffer_init(&msg);
438 buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
439 buffer_put_string(&msg, blob, blen);
440 buffer_put_string(&msg, data, datalen);
Damien Miller62cee002000-09-23 17:15:56 +1100441 buffer_put_int(&msg, flags);
Darren Tuckera627d422013-06-02 07:31:17 +1000442 free(blob);
Damien Millerad833b32000-08-23 10:46:23 +1000443
444 if (ssh_request_reply(auth, &msg, &msg) == 0) {
445 buffer_free(&msg);
446 return -1;
447 }
448 type = buffer_get_char(&msg);
Damien Miller874d77b2000-10-14 16:23:11 +1100449 if (agent_failed(type)) {
Damien Miller996acd22003-04-09 20:59:48 +1000450 logit("Agent admitted failure to sign using the key.");
Damien Millerad833b32000-08-23 10:46:23 +1000451 } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
452 fatal("Bad authentication response: %d", type);
453 } else {
454 ret = 0;
455 *sigp = buffer_get_string(&msg, lenp);
456 }
457 buffer_free(&msg);
458 return ret;
459}
460
Damien Miller994cf142000-07-21 10:19:44 +1000461/* Encode key for a message to the agent. */
462
Damien Miller1f0311c2014-05-15 14:24:09 +1000463#ifdef WITH_SSH1
Ben Lindstrombba81212001-06-25 05:01:22 +0000464static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100465ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000466{
Damien Miller994cf142000-07-21 10:19:44 +1000467 buffer_put_int(b, BN_num_bits(key->n));
468 buffer_put_bignum(b, key->n);
469 buffer_put_bignum(b, key->e);
470 buffer_put_bignum(b, key->d);
471 /* To keep within the protocol: p < q for ssh. in SSL p > q */
472 buffer_put_bignum(b, key->iqmp); /* ssh key->u */
473 buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */
474 buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */
Ben Lindstrom664408d2001-06-09 01:42:01 +0000475 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000476}
Damien Miller1f0311c2014-05-15 14:24:09 +1000477#endif
Damien Miller994cf142000-07-21 10:19:44 +1000478
Ben Lindstrombba81212001-06-25 05:01:22 +0000479static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100480ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000481{
Damien Millerf0e90602013-12-07 10:40:26 +1100482 key_private_serialize(key, b);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100483 buffer_put_cstring(b, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000484}
485
Damien Miller5428f641999-11-25 11:54:57 +1100486/*
487 * Adds an identity to the authentication server. This call is not meant to
488 * be used by normal applications.
489 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000490
Damien Miller4af51302000-04-16 11:18:38 +1000491int
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000492ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key,
Damien Miller6c711792003-01-24 11:36:23 +1100493 const char *comment, u_int life, u_int confirm)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000494{
Damien Millerad833b32000-08-23 10:46:23 +1000495 Buffer msg;
Damien Miller6c711792003-01-24 11:36:23 +1100496 int type, constrained = (life || confirm);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000497
Damien Millerad833b32000-08-23 10:46:23 +1000498 buffer_init(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000499
500 switch (key->type) {
Damien Miller1f0311c2014-05-15 14:24:09 +1000501#ifdef WITH_SSH1
Damien Miller0bc1bd82000-11-13 22:57:25 +1100502 case KEY_RSA1:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000503 type = constrained ?
504 SSH_AGENTC_ADD_RSA_ID_CONSTRAINED :
505 SSH_AGENTC_ADD_RSA_IDENTITY;
506 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100507 ssh_encode_identity_rsa1(&msg, key->rsa, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000508 break;
Damien Miller1f0311c2014-05-15 14:24:09 +1000509#endif
510#ifdef WITH_OPENSSL
Damien Miller0bc1bd82000-11-13 22:57:25 +1100511 case KEY_RSA:
Damien Miller0a80ca12010-02-27 07:55:05 +1100512 case KEY_RSA_CERT:
Damien Miller4e270b02010-04-16 15:56:21 +1000513 case KEY_RSA_CERT_V00:
Damien Miller994cf142000-07-21 10:19:44 +1000514 case KEY_DSA:
Damien Miller0a80ca12010-02-27 07:55:05 +1100515 case KEY_DSA_CERT:
Damien Miller4e270b02010-04-16 15:56:21 +1000516 case KEY_DSA_CERT_V00:
Damien Millereb8b60e2010-08-31 22:41:14 +1000517 case KEY_ECDSA:
518 case KEY_ECDSA_CERT:
Damien Miller1f0311c2014-05-15 14:24:09 +1000519#endif
Damien Miller5be9d9e2013-12-07 11:24:01 +1100520 case KEY_ED25519:
521 case KEY_ED25519_CERT:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000522 type = constrained ?
523 SSH2_AGENTC_ADD_ID_CONSTRAINED :
524 SSH2_AGENTC_ADD_IDENTITY;
525 buffer_put_char(&msg, type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100526 ssh_encode_identity_ssh2(&msg, key, comment);
Damien Miller994cf142000-07-21 10:19:44 +1000527 break;
528 default:
Damien Millerad833b32000-08-23 10:46:23 +1000529 buffer_free(&msg);
Damien Miller994cf142000-07-21 10:19:44 +1000530 return 0;
Damien Miller994cf142000-07-21 10:19:44 +1000531 }
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000532 if (constrained) {
533 if (life != 0) {
534 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
535 buffer_put_int(&msg, life);
536 }
Damien Miller6c711792003-01-24 11:36:23 +1100537 if (confirm != 0)
538 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000539 }
Damien Millerad833b32000-08-23 10:46:23 +1000540 if (ssh_request_reply(auth, &msg, &msg) == 0) {
541 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100542 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000543 }
Damien Millerad833b32000-08-23 10:46:23 +1000544 type = buffer_get_char(&msg);
545 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000546 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100547}
548
Damien Miller5428f641999-11-25 11:54:57 +1100549/*
550 * Removes an identity from the authentication server. This call is not
551 * meant to be used by normal applications.
552 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000553
Damien Miller4af51302000-04-16 11:18:38 +1000554int
Damien Millerad833b32000-08-23 10:46:23 +1000555ssh_remove_identity(AuthenticationConnection *auth, Key *key)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000556{
Damien Millerad833b32000-08-23 10:46:23 +1000557 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000558 int type;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000559 u_char *blob;
560 u_int blen;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000561
Damien Millerad833b32000-08-23 10:46:23 +1000562 buffer_init(&msg);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000563
Damien Miller1f0311c2014-05-15 14:24:09 +1000564#ifdef WITH_SSH1
Damien Miller0bc1bd82000-11-13 22:57:25 +1100565 if (key->type == KEY_RSA1) {
Damien Millerad833b32000-08-23 10:46:23 +1000566 buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY);
567 buffer_put_int(&msg, BN_num_bits(key->rsa->n));
568 buffer_put_bignum(&msg, key->rsa->e);
569 buffer_put_bignum(&msg, key->rsa->n);
Damien Miller1f0311c2014-05-15 14:24:09 +1000570 } else
571#endif
572 if (key->type != KEY_UNSPEC) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100573 key_to_blob(key, &blob, &blen);
Damien Millerad833b32000-08-23 10:46:23 +1000574 buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY);
575 buffer_put_string(&msg, blob, blen);
Darren Tuckera627d422013-06-02 07:31:17 +1000576 free(blob);
Damien Millerad833b32000-08-23 10:46:23 +1000577 } else {
578 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100579 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000580 }
Damien Millerad833b32000-08-23 10:46:23 +1000581 if (ssh_request_reply(auth, &msg, &msg) == 0) {
582 buffer_free(&msg);
583 return 0;
584 }
585 type = buffer_get_char(&msg);
586 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000587 return decode_reply(type);
Damien Miller95def091999-11-25 00:26:21 +1100588}
589
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000590int
Damien Millera8e06ce2003-11-21 23:48:55 +1100591ssh_update_card(AuthenticationConnection *auth, int add,
Damien Millerd94f20d2003-06-11 22:06:33 +1000592 const char *reader_id, const char *pin, u_int life, u_int confirm)
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000593{
594 Buffer msg;
Damien Millerd94f20d2003-06-11 22:06:33 +1000595 int type, constrained = (life || confirm);
596
597 if (add) {
598 type = constrained ?
599 SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
600 SSH_AGENTC_ADD_SMARTCARD_KEY;
601 } else
602 type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000603
604 buffer_init(&msg);
Damien Millerd94f20d2003-06-11 22:06:33 +1000605 buffer_put_char(&msg, type);
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000606 buffer_put_cstring(&msg, reader_id);
Ben Lindstromba72d302002-03-22 03:51:06 +0000607 buffer_put_cstring(&msg, pin);
Damien Miller787b2ec2003-11-21 23:56:47 +1100608
Damien Millerd94f20d2003-06-11 22:06:33 +1000609 if (constrained) {
610 if (life != 0) {
611 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
612 buffer_put_int(&msg, life);
613 }
614 if (confirm != 0)
615 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
616 }
617
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000618 if (ssh_request_reply(auth, &msg, &msg) == 0) {
619 buffer_free(&msg);
620 return 0;
621 }
622 type = buffer_get_char(&msg);
623 buffer_free(&msg);
624 return decode_reply(type);
625}
626
Damien Miller5428f641999-11-25 11:54:57 +1100627/*
628 * Removes all identities from the agent. This call is not meant to be used
629 * by normal applications.
630 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000631
Damien Miller4af51302000-04-16 11:18:38 +1000632int
Damien Millerad833b32000-08-23 10:46:23 +1000633ssh_remove_all_identities(AuthenticationConnection *auth, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000634{
Damien Millerad833b32000-08-23 10:46:23 +1000635 Buffer msg;
Damien Miller942da032000-08-18 13:59:06 +1000636 int type;
Damien Millerad833b32000-08-23 10:46:23 +1000637 int code = (version==1) ?
638 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
639 SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000640
Damien Millerad833b32000-08-23 10:46:23 +1000641 buffer_init(&msg);
642 buffer_put_char(&msg, code);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000643
Damien Millerad833b32000-08-23 10:46:23 +1000644 if (ssh_request_reply(auth, &msg, &msg) == 0) {
645 buffer_free(&msg);
Damien Miller95def091999-11-25 00:26:21 +1100646 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000647 }
Damien Millerad833b32000-08-23 10:46:23 +1000648 type = buffer_get_char(&msg);
649 buffer_free(&msg);
Damien Miller942da032000-08-18 13:59:06 +1000650 return decode_reply(type);
651}
652
Kevin Stevesef4eea92001-02-05 12:42:17 +0000653int
Damien Miller942da032000-08-18 13:59:06 +1000654decode_reply(int type)
655{
Damien Miller95def091999-11-25 00:26:21 +1100656 switch (type) {
657 case SSH_AGENT_FAILURE:
Damien Miller874d77b2000-10-14 16:23:11 +1100658 case SSH_COM_AGENT2_FAILURE:
Ben Lindstromc9a26362001-08-15 23:04:50 +0000659 case SSH2_AGENT_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +1000660 logit("SSH_AGENT_FAILURE");
Damien Miller95def091999-11-25 00:26:21 +1100661 return 0;
662 case SSH_AGENT_SUCCESS:
Damien Miller95def091999-11-25 00:26:21 +1100663 return 1;
664 default:
Damien Miller37023962000-07-11 17:31:38 +1000665 fatal("Bad response from authentication agent: %d", type);
Damien Miller95def091999-11-25 00:26:21 +1100666 }
667 /* NOTREACHED */
668 return 0;
669}