blob: 82915a43d633274fcbb71df6ccd9f576f168bdcb [file] [log] [blame]
markus@openbsd.orgfecede02015-03-26 19:32:19 +00001/* $OpenBSD: authfd.c,v 1.97 2015/03/26 19:32:19 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>
djm@openbsd.org141efe42015-01-14 20:05:27 +000050#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100051
Damien Millerd7834352006-08-05 12:39:39 +100052#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100053#include "ssh.h"
54#include "rsa.h"
djm@openbsd.org141efe42015-01-14 20:05:27 +000055#include "sshbuf.h"
56#include "sshkey.h"
Damien Miller994cf142000-07-21 10:19:44 +100057#include "authfd.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000058#include "cipher.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"
djm@openbsd.org141efe42015-01-14 20:05:27 +000063#include "ssherr.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064
djm@openbsd.org141efe42015-01-14 20:05:27 +000065#define MAX_AGENT_IDENTITIES 2048 /* Max keys in agent reply */
66#define MAX_AGENT_REPLY_LEN (256 * 1024) /* Max bytes in agent reply */
Damien Miller37023962000-07-11 17:31:38 +100067
Damien Miller874d77b2000-10-14 16:23:11 +110068/* macro to check for "agent failure" message */
69#define agent_failed(x) \
djm@openbsd.org141efe42015-01-14 20:05:27 +000070 ((x == SSH_AGENT_FAILURE) || \
71 (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
djm@openbsd.org141efe42015-01-14 20:05:27 +000074/* Convert success/failure response from agent to a err.h status */
75static int
76decode_reply(u_char type)
Damien Miller789e95d2002-09-12 09:52:46 +100077{
djm@openbsd.org141efe42015-01-14 20:05:27 +000078 if (agent_failed(type))
79 return SSH_ERR_AGENT_FAILURE;
80 else if (type == SSH_AGENT_SUCCESS)
Damien Miller789e95d2002-09-12 09:52:46 +100081 return 0;
djm@openbsd.org141efe42015-01-14 20:05:27 +000082 else
83 return SSH_ERR_INVALID_FORMAT;
Damien Miller789e95d2002-09-12 09:52:46 +100084}
85
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086/* Returns the number of the authentication fd, or -1 if there is none. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100087int
djm@openbsd.org141efe42015-01-14 20:05:27 +000088ssh_get_authentication_socket(int *fdp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100089{
Damien Miller95def091999-11-25 00:26:21 +110090 const char *authsocket;
djm@openbsd.org141efe42015-01-14 20:05:27 +000091 int sock, oerrno;
Damien Miller95def091999-11-25 00:26:21 +110092 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100093
djm@openbsd.org141efe42015-01-14 20:05:27 +000094 if (fdp != NULL)
95 *fdp = -1;
96
Damien Miller95def091999-11-25 00:26:21 +110097 authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
98 if (!authsocket)
djm@openbsd.org141efe42015-01-14 20:05:27 +000099 return SSH_ERR_AGENT_NOT_PRESENT;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100
Damien Miller1d2c4562014-02-04 11:18:20 +1100101 memset(&sunaddr, 0, sizeof(sunaddr));
Damien Miller95def091999-11-25 00:26:21 +1100102 sunaddr.sun_family = AF_UNIX;
103 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
Damien Miller10f6f6b1999-11-17 17:29:08 +1100104
djm@openbsd.org141efe42015-01-14 20:05:27 +0000105 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
106 return SSH_ERR_SYSTEM_ERROR;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000107
Damien Miller95def091999-11-25 00:26:21 +1100108 /* close on exec */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000109 if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1 ||
110 connect(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
111 oerrno = errno;
Damien Miller95def091999-11-25 00:26:21 +1100112 close(sock);
djm@openbsd.org141efe42015-01-14 20:05:27 +0000113 errno = oerrno;
114 return SSH_ERR_SYSTEM_ERROR;
Damien Miller95def091999-11-25 00:26:21 +1100115 }
djm@openbsd.org141efe42015-01-14 20:05:27 +0000116 if (fdp != NULL)
117 *fdp = sock;
118 else
Damien Miller95def091999-11-25 00:26:21 +1100119 close(sock);
djm@openbsd.org141efe42015-01-14 20:05:27 +0000120 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000121}
122
djm@openbsd.org141efe42015-01-14 20:05:27 +0000123/* Communicate with agent: send request and read reply */
Ben Lindstrombba81212001-06-25 05:01:22 +0000124static int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000125ssh_request_reply(int sock, struct sshbuf *request, struct sshbuf *reply)
Damien Miller942da032000-08-18 13:59:06 +1000126{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000127 int r;
128 size_t 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. */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000132 len = sshbuf_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. */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000136 if (atomicio(vwrite, sock, buf, 4) != 4 ||
137 atomicio(vwrite, sock, (u_char *)sshbuf_ptr(request),
138 sshbuf_len(request)) != sshbuf_len(request))
139 return SSH_ERR_AGENT_COMMUNICATION;
Damien Miller942da032000-08-18 13:59:06 +1000140 /*
141 * Wait for response from the agent. First read the length of the
142 * response packet.
143 */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000144 if (atomicio(read, sock, buf, 4) != 4)
145 return SSH_ERR_AGENT_COMMUNICATION;
Damien Miller942da032000-08-18 13:59:06 +1000146
147 /* Extract the length, and check it for sanity. */
Damien Miller3f941882006-03-31 23:13:02 +1100148 len = get_u32(buf);
djm@openbsd.org141efe42015-01-14 20:05:27 +0000149 if (len > MAX_AGENT_REPLY_LEN)
150 return SSH_ERR_INVALID_FORMAT;
Damien Miller942da032000-08-18 13:59:06 +1000151
152 /* Read the rest of the response in to the buffer. */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000153 sshbuf_reset(reply);
Damien Miller942da032000-08-18 13:59:06 +1000154 while (len > 0) {
155 l = len;
156 if (l > sizeof(buf))
157 l = sizeof(buf);
djm@openbsd.org141efe42015-01-14 20:05:27 +0000158 if (atomicio(read, sock, buf, l) != l)
159 return SSH_ERR_AGENT_COMMUNICATION;
160 if ((r = sshbuf_put(reply, buf, l)) != 0)
161 return r;
Damien Miller942da032000-08-18 13:59:06 +1000162 len -= l;
163 }
djm@openbsd.org141efe42015-01-14 20:05:27 +0000164 return 0;
Damien Miller942da032000-08-18 13:59:06 +1000165}
166
Damien Miller5428f641999-11-25 11:54:57 +1100167/*
168 * Closes the agent socket if it should be closed (depends on how it was
169 * obtained). The argument must have been returned by
170 * ssh_get_authentication_socket().
171 */
Damien Miller4af51302000-04-16 11:18:38 +1000172void
Damien Miller95def091999-11-25 00:26:21 +1100173ssh_close_authentication_socket(int sock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000174{
Damien Miller95def091999-11-25 00:26:21 +1100175 if (getenv(SSH_AUTHSOCKET_ENV_NAME))
176 close(sock);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000177}
178
Ben Lindstrom2f717042002-06-06 21:52:03 +0000179/* Lock/unlock agent */
180int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000181ssh_lock_agent(int sock, int lock, const char *password)
Ben Lindstrom2f717042002-06-06 21:52:03 +0000182{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000183 int r;
184 u_char type = lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK;
185 struct sshbuf *msg;
Ben Lindstrom2f717042002-06-06 21:52:03 +0000186
djm@openbsd.org141efe42015-01-14 20:05:27 +0000187 if ((msg = sshbuf_new()) == NULL)
188 return SSH_ERR_ALLOC_FAIL;
189 if ((r = sshbuf_put_u8(msg, type)) != 0 ||
190 (r = sshbuf_put_cstring(msg, password)) != 0)
191 goto out;
192 if ((r = ssh_request_reply(sock, msg, msg)) != 0)
193 goto out;
194 if ((r = sshbuf_get_u8(msg, &type)) != 0)
195 goto out;
196 r = decode_reply(type);
197 out:
198 sshbuf_free(msg);
199 return r;
200}
Ben Lindstrom2f717042002-06-06 21:52:03 +0000201
djm@openbsd.org141efe42015-01-14 20:05:27 +0000202#ifdef WITH_SSH1
203static int
204deserialise_identity1(struct sshbuf *ids, struct sshkey **keyp, char **commentp)
205{
206 struct sshkey *key;
207 int r, keybits;
208 u_int32_t bits;
209 char *comment = NULL;
210
211 if ((key = sshkey_new(KEY_RSA1)) == NULL)
212 return SSH_ERR_ALLOC_FAIL;
213 if ((r = sshbuf_get_u32(ids, &bits)) != 0 ||
214 (r = sshbuf_get_bignum1(ids, key->rsa->e)) != 0 ||
215 (r = sshbuf_get_bignum1(ids, key->rsa->n)) != 0 ||
216 (r = sshbuf_get_cstring(ids, &comment, NULL)) != 0)
217 goto out;
218 keybits = BN_num_bits(key->rsa->n);
219 /* XXX previously we just warned here. I think we should be strict */
220 if (keybits < 0 || bits != (u_int)keybits) {
221 r = SSH_ERR_KEY_BITS_MISMATCH;
222 goto out;
Ben Lindstrom2f717042002-06-06 21:52:03 +0000223 }
djm@openbsd.org141efe42015-01-14 20:05:27 +0000224 if (keyp != NULL) {
225 *keyp = key;
226 key = NULL;
227 }
228 if (commentp != NULL) {
229 *commentp = comment;
230 comment = NULL;
231 }
232 r = 0;
233 out:
234 sshkey_free(key);
235 free(comment);
236 return r;
237}
238#endif
239
240static int
241deserialise_identity2(struct sshbuf *ids, struct sshkey **keyp, char **commentp)
242{
243 int r;
244 char *comment = NULL;
245 const u_char *blob;
246 size_t blen;
247
248 if ((r = sshbuf_get_string_direct(ids, &blob, &blen)) != 0 ||
249 (r = sshbuf_get_cstring(ids, &comment, NULL)) != 0)
250 goto out;
251 if ((r = sshkey_from_blob(blob, blen, keyp)) != 0)
252 goto out;
253 if (commentp != NULL) {
254 *commentp = comment;
255 comment = NULL;
256 }
257 r = 0;
258 out:
259 free(comment);
260 return r;
Ben Lindstrom2f717042002-06-06 21:52:03 +0000261}
262
Damien Miller5428f641999-11-25 11:54:57 +1100263/*
djm@openbsd.org141efe42015-01-14 20:05:27 +0000264 * Fetch list of identities held by the agent.
Damien Miller5428f641999-11-25 11:54:57 +1100265 */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100266int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000267ssh_fetch_identitylist(int sock, int version, struct ssh_identitylist **idlp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000268{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000269 u_char type, code1 = 0, code2 = 0;
270 u_int32_t num, i;
271 struct sshbuf *msg;
272 struct ssh_identitylist *idl = NULL;
273 int r;
Damien Millerad833b32000-08-23 10:46:23 +1000274
djm@openbsd.org141efe42015-01-14 20:05:27 +0000275 /* Determine request and expected response types */
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000276 switch (version) {
Damien Millerad833b32000-08-23 10:46:23 +1000277 case 1:
278 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
279 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
280 break;
281 case 2:
282 code1 = SSH2_AGENTC_REQUEST_IDENTITIES;
283 code2 = SSH2_AGENT_IDENTITIES_ANSWER;
284 break;
285 default:
djm@openbsd.org141efe42015-01-14 20:05:27 +0000286 return SSH_ERR_INVALID_ARGUMENT;
Damien Millerad833b32000-08-23 10:46:23 +1000287 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000288
Damien Miller5428f641999-11-25 11:54:57 +1100289 /*
290 * Send a message to the agent requesting for a list of the
291 * identities it can represent.
292 */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000293 if ((msg = sshbuf_new()) == NULL)
294 return SSH_ERR_ALLOC_FAIL;
295 if ((r = sshbuf_put_u8(msg, code1)) != 0)
296 goto out;
Damien Miller942da032000-08-18 13:59:06 +1000297
djm@openbsd.org141efe42015-01-14 20:05:27 +0000298 if ((r = ssh_request_reply(sock, msg, msg)) != 0)
299 goto out;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000300
Damien Miller95def091999-11-25 00:26:21 +1100301 /* Get message type, and verify that we got a proper answer. */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000302 if ((r = sshbuf_get_u8(msg, &type)) != 0)
303 goto out;
Damien Miller874d77b2000-10-14 16:23:11 +1100304 if (agent_failed(type)) {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000305 r = SSH_ERR_AGENT_FAILURE;
306 goto out;
Damien Millerad833b32000-08-23 10:46:23 +1000307 } else if (type != code2) {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000308 r = SSH_ERR_INVALID_FORMAT;
309 goto out;
Damien Millerad833b32000-08-23 10:46:23 +1000310 }
Damien Miller95def091999-11-25 00:26:21 +1100311
312 /* Get the number of entries in the response and check it for sanity. */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000313 if ((r = sshbuf_get_u32(msg, &num)) != 0)
314 goto out;
315 if (num > MAX_AGENT_IDENTITIES) {
316 r = SSH_ERR_INVALID_FORMAT;
317 goto out;
Damien Millerad833b32000-08-23 10:46:23 +1000318 }
djm@openbsd.org141efe42015-01-14 20:05:27 +0000319 if (num == 0) {
320 r = SSH_ERR_AGENT_NO_IDENTITIES;
321 goto out;
322 }
323
324 /* Deserialise the response into a list of keys/comments */
325 if ((idl = calloc(1, sizeof(*idl))) == NULL ||
326 (idl->keys = calloc(num, sizeof(*idl->keys))) == NULL ||
327 (idl->comments = calloc(num, sizeof(*idl->comments))) == NULL) {
328 r = SSH_ERR_ALLOC_FAIL;
329 goto out;
330 }
331 for (i = 0; i < num;) {
332 switch (version) {
333 case 1:
334#ifdef WITH_SSH1
335 if ((r = deserialise_identity1(msg,
336 &(idl->keys[i]), &(idl->comments[i]))) != 0)
337 goto out;
338#endif
339 break;
340 case 2:
341 if ((r = deserialise_identity2(msg,
342 &(idl->keys[i]), &(idl->comments[i]))) != 0) {
343 if (r == SSH_ERR_KEY_TYPE_UNKNOWN) {
344 /* Gracefully skip unknown key types */
345 num--;
346 continue;
347 } else
348 goto out;
349 }
350 break;
351 }
352 i++;
353 }
354 idl->nkeys = num;
355 *idlp = idl;
356 idl = NULL;
357 r = 0;
358 out:
359 sshbuf_free(msg);
360 if (idl != NULL)
361 ssh_free_identitylist(idl);
362 return r;
363}
364
365void
366ssh_free_identitylist(struct ssh_identitylist *idl)
367{
368 size_t i;
369
370 if (idl == NULL)
371 return;
372 for (i = 0; i < idl->nkeys; i++) {
373 if (idl->keys != NULL)
374 sshkey_free(idl->keys[i]);
375 if (idl->comments != NULL)
376 free(idl->comments[i]);
377 }
378 free(idl);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000379}
380
Damien Miller5428f641999-11-25 11:54:57 +1100381/*
djm@openbsd.org141efe42015-01-14 20:05:27 +0000382 * Sends a challenge (typically from a server via ssh(1)) to the agent,
383 * and waits for a response from the agent.
384 * Returns true (non-zero) if the agent gave the correct answer, zero
385 * otherwise.
Damien Miller5428f641999-11-25 11:54:57 +1100386 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000387
Damien Miller1f0311c2014-05-15 14:24:09 +1000388#ifdef WITH_SSH1
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000389int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000390ssh_decrypt_challenge(int sock, struct sshkey* key, BIGNUM *challenge,
391 u_char session_id[16], u_char response[16])
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000392{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000393 struct sshbuf *msg;
394 int r;
395 u_char type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000396
Damien Miller0bc1bd82000-11-13 22:57:25 +1100397 if (key->type != KEY_RSA1)
djm@openbsd.org141efe42015-01-14 20:05:27 +0000398 return SSH_ERR_INVALID_ARGUMENT;
399 if ((msg = sshbuf_new()) == NULL)
400 return SSH_ERR_ALLOC_FAIL;
401 if ((r = sshbuf_put_u8(msg, SSH_AGENTC_RSA_CHALLENGE)) != 0 ||
402 (r = sshbuf_put_u32(msg, BN_num_bits(key->rsa->n))) != 0 ||
403 (r = sshbuf_put_bignum1(msg, key->rsa->e)) != 0 ||
404 (r = sshbuf_put_bignum1(msg, key->rsa->n)) != 0 ||
405 (r = sshbuf_put_bignum1(msg, challenge)) != 0 ||
406 (r = sshbuf_put(msg, session_id, 16)) != 0 ||
407 (r = sshbuf_put_u32(msg, 1)) != 0) /* Response type for proto 1.1 */
408 goto out;
409 if ((r = ssh_request_reply(sock, msg, msg)) != 0)
410 goto out;
411 if ((r = sshbuf_get_u8(msg, &type)) != 0)
412 goto out;
Damien Miller874d77b2000-10-14 16:23:11 +1100413 if (agent_failed(type)) {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000414 r = SSH_ERR_AGENT_FAILURE;
415 goto out;
Damien Miller942da032000-08-18 13:59:06 +1000416 } else if (type != SSH_AGENT_RSA_RESPONSE) {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000417 r = SSH_ERR_INVALID_FORMAT;
418 goto out;
Damien Miller95def091999-11-25 00:26:21 +1100419 }
djm@openbsd.org141efe42015-01-14 20:05:27 +0000420 if ((r = sshbuf_get(msg, response, 16)) != 0)
421 goto out;
422 r = 0;
423 out:
424 sshbuf_free(msg);
425 return r;
Damien Miller95def091999-11-25 00:26:21 +1100426}
Damien Miller1f0311c2014-05-15 14:24:09 +1000427#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000428
djm@openbsd.org141efe42015-01-14 20:05:27 +0000429/* ask agent to sign data, returns err.h code on error, 0 on success */
Damien Millerad833b32000-08-23 10:46:23 +1000430int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000431ssh_agent_sign(int sock, struct sshkey *key,
432 u_char **sigp, size_t *lenp,
433 const u_char *data, size_t datalen, u_int compat)
Damien Millerad833b32000-08-23 10:46:23 +1000434{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000435 struct sshbuf *msg;
436 u_char *blob = NULL, type;
437 size_t blen = 0, len = 0;
438 u_int flags = 0;
439 int r = SSH_ERR_INTERNAL_ERROR;
Damien Millerad833b32000-08-23 10:46:23 +1000440
markus@openbsd.orgfecede02015-03-26 19:32:19 +0000441 *sigp = NULL;
442 *lenp = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000443
djm@openbsd.org141efe42015-01-14 20:05:27 +0000444 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
445 return SSH_ERR_INVALID_ARGUMENT;
446 if (compat & SSH_BUG_SIGBLOB)
447 flags |= SSH_AGENT_OLD_SIGNATURE;
448 if ((msg = sshbuf_new()) == NULL)
449 return SSH_ERR_ALLOC_FAIL;
450 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
451 goto out;
452 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 ||
453 (r = sshbuf_put_string(msg, blob, blen)) != 0 ||
454 (r = sshbuf_put_string(msg, data, datalen)) != 0 ||
455 (r = sshbuf_put_u32(msg, flags)) != 0)
456 goto out;
457 if ((r = ssh_request_reply(sock, msg, msg) != 0))
458 goto out;
459 if ((r = sshbuf_get_u8(msg, &type)) != 0)
460 goto out;
Damien Miller874d77b2000-10-14 16:23:11 +1100461 if (agent_failed(type)) {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000462 r = SSH_ERR_AGENT_FAILURE;
463 goto out;
Damien Millerad833b32000-08-23 10:46:23 +1000464 } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000465 r = SSH_ERR_INVALID_FORMAT;
466 goto out;
Damien Millerad833b32000-08-23 10:46:23 +1000467 }
djm@openbsd.org141efe42015-01-14 20:05:27 +0000468 if ((r = sshbuf_get_string(msg, sigp, &len)) != 0)
469 goto out;
markus@openbsd.orgfecede02015-03-26 19:32:19 +0000470 *lenp = len;
djm@openbsd.org141efe42015-01-14 20:05:27 +0000471 r = 0;
472 out:
473 if (blob != NULL) {
474 explicit_bzero(blob, blen);
475 free(blob);
476 }
477 sshbuf_free(msg);
478 return r;
Damien Millerad833b32000-08-23 10:46:23 +1000479}
480
Damien Miller994cf142000-07-21 10:19:44 +1000481/* Encode key for a message to the agent. */
482
Damien Miller1f0311c2014-05-15 14:24:09 +1000483#ifdef WITH_SSH1
djm@openbsd.org141efe42015-01-14 20:05:27 +0000484static int
485ssh_encode_identity_rsa1(struct sshbuf *b, RSA *key, const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000486{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000487 int r;
488
Damien Miller994cf142000-07-21 10:19:44 +1000489 /* To keep within the protocol: p < q for ssh. in SSL p > q */
djm@openbsd.org141efe42015-01-14 20:05:27 +0000490 if ((r = sshbuf_put_u32(b, BN_num_bits(key->n))) != 0 ||
491 (r = sshbuf_put_bignum1(b, key->n)) != 0 ||
492 (r = sshbuf_put_bignum1(b, key->e)) != 0 ||
493 (r = sshbuf_put_bignum1(b, key->d)) != 0 ||
494 (r = sshbuf_put_bignum1(b, key->iqmp)) != 0 ||
495 (r = sshbuf_put_bignum1(b, key->q)) != 0 ||
496 (r = sshbuf_put_bignum1(b, key->p)) != 0 ||
497 (r = sshbuf_put_cstring(b, comment)) != 0)
498 return r;
499 return 0;
Damien Miller994cf142000-07-21 10:19:44 +1000500}
Damien Miller1f0311c2014-05-15 14:24:09 +1000501#endif
Damien Miller994cf142000-07-21 10:19:44 +1000502
djm@openbsd.org141efe42015-01-14 20:05:27 +0000503static int
504ssh_encode_identity_ssh2(struct sshbuf *b, struct sshkey *key,
505 const char *comment)
Damien Miller994cf142000-07-21 10:19:44 +1000506{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000507 int r;
508
509 if ((r = sshkey_private_serialize(key, b)) != 0 ||
510 (r = sshbuf_put_cstring(b, comment)) != 0)
511 return r;
512 return 0;
513}
514
515static int
516encode_constraints(struct sshbuf *m, u_int life, u_int confirm)
517{
518 int r;
519
520 if (life != 0) {
521 if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_LIFETIME)) != 0 ||
522 (r = sshbuf_put_u32(m, life)) != 0)
523 goto out;
524 }
525 if (confirm != 0) {
526 if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_CONFIRM)) != 0)
527 goto out;
528 }
529 r = 0;
530 out:
531 return r;
Damien Miller994cf142000-07-21 10:19:44 +1000532}
533
Damien Miller5428f641999-11-25 11:54:57 +1100534/*
djm@openbsd.org141efe42015-01-14 20:05:27 +0000535 * Adds an identity to the authentication server.
536 * This call is intended only for use by ssh-add(1) and like applications.
Damien Miller5428f641999-11-25 11:54:57 +1100537 */
Damien Miller4af51302000-04-16 11:18:38 +1000538int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000539ssh_add_identity_constrained(int sock, struct sshkey *key, const char *comment,
540 u_int life, u_int confirm)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000541{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000542 struct sshbuf *msg;
543 int r, constrained = (life || confirm);
544 u_char type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000545
djm@openbsd.org141efe42015-01-14 20:05:27 +0000546 if ((msg = sshbuf_new()) == NULL)
547 return SSH_ERR_ALLOC_FAIL;
Damien Miller994cf142000-07-21 10:19:44 +1000548
549 switch (key->type) {
Damien Miller1f0311c2014-05-15 14:24:09 +1000550#ifdef WITH_SSH1
Damien Miller0bc1bd82000-11-13 22:57:25 +1100551 case KEY_RSA1:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000552 type = constrained ?
553 SSH_AGENTC_ADD_RSA_ID_CONSTRAINED :
554 SSH_AGENTC_ADD_RSA_IDENTITY;
djm@openbsd.org141efe42015-01-14 20:05:27 +0000555 if ((r = sshbuf_put_u8(msg, type)) != 0 ||
556 (r = ssh_encode_identity_rsa1(msg, key->rsa, comment)) != 0)
557 goto out;
Damien Miller994cf142000-07-21 10:19:44 +1000558 break;
Damien Miller1f0311c2014-05-15 14:24:09 +1000559#endif
560#ifdef WITH_OPENSSL
Damien Miller0bc1bd82000-11-13 22:57:25 +1100561 case KEY_RSA:
Damien Miller0a80ca12010-02-27 07:55:05 +1100562 case KEY_RSA_CERT:
Damien Miller4e270b02010-04-16 15:56:21 +1000563 case KEY_RSA_CERT_V00:
Damien Miller994cf142000-07-21 10:19:44 +1000564 case KEY_DSA:
Damien Miller0a80ca12010-02-27 07:55:05 +1100565 case KEY_DSA_CERT:
Damien Miller4e270b02010-04-16 15:56:21 +1000566 case KEY_DSA_CERT_V00:
Damien Millereb8b60e2010-08-31 22:41:14 +1000567 case KEY_ECDSA:
568 case KEY_ECDSA_CERT:
Damien Miller1f0311c2014-05-15 14:24:09 +1000569#endif
Damien Miller5be9d9e2013-12-07 11:24:01 +1100570 case KEY_ED25519:
571 case KEY_ED25519_CERT:
Ben Lindstrom2b266b72002-06-21 00:08:39 +0000572 type = constrained ?
573 SSH2_AGENTC_ADD_ID_CONSTRAINED :
574 SSH2_AGENTC_ADD_IDENTITY;
djm@openbsd.org141efe42015-01-14 20:05:27 +0000575 if ((r = sshbuf_put_u8(msg, type)) != 0 ||
576 (r = ssh_encode_identity_ssh2(msg, key, comment)) != 0)
577 goto out;
Damien Miller994cf142000-07-21 10:19:44 +1000578 break;
579 default:
djm@openbsd.org141efe42015-01-14 20:05:27 +0000580 r = SSH_ERR_INVALID_ARGUMENT;
581 goto out;
Damien Miller994cf142000-07-21 10:19:44 +1000582 }
djm@openbsd.org141efe42015-01-14 20:05:27 +0000583 if (constrained &&
584 (r = encode_constraints(msg, life, confirm)) != 0)
585 goto out;
586 if ((r = ssh_request_reply(sock, msg, msg)) != 0)
587 goto out;
588 if ((r = sshbuf_get_u8(msg, &type)) != 0)
589 goto out;
590 r = decode_reply(type);
591 out:
592 sshbuf_free(msg);
593 return r;
Damien Miller95def091999-11-25 00:26:21 +1100594}
595
Damien Miller5428f641999-11-25 11:54:57 +1100596/*
djm@openbsd.org141efe42015-01-14 20:05:27 +0000597 * Removes an identity from the authentication server.
598 * This call is intended only for use by ssh-add(1) and like applications.
Damien Miller5428f641999-11-25 11:54:57 +1100599 */
Damien Miller4af51302000-04-16 11:18:38 +1000600int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000601ssh_remove_identity(int sock, struct sshkey *key)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000602{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000603 struct sshbuf *msg;
604 int r;
605 u_char type, *blob = NULL;
606 size_t blen;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000607
djm@openbsd.org141efe42015-01-14 20:05:27 +0000608 if ((msg = sshbuf_new()) == NULL)
609 return SSH_ERR_ALLOC_FAIL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000610
Damien Miller1f0311c2014-05-15 14:24:09 +1000611#ifdef WITH_SSH1
Damien Miller0bc1bd82000-11-13 22:57:25 +1100612 if (key->type == KEY_RSA1) {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000613 if ((r = sshbuf_put_u8(msg,
614 SSH_AGENTC_REMOVE_RSA_IDENTITY)) != 0 ||
615 (r = sshbuf_put_u32(msg, BN_num_bits(key->rsa->n))) != 0 ||
616 (r = sshbuf_put_bignum1(msg, key->rsa->e)) != 0 ||
617 (r = sshbuf_put_bignum1(msg, key->rsa->n)) != 0)
618 goto out;
Damien Miller1f0311c2014-05-15 14:24:09 +1000619 } else
620#endif
621 if (key->type != KEY_UNSPEC) {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000622 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
623 goto out;
624 if ((r = sshbuf_put_u8(msg,
625 SSH2_AGENTC_REMOVE_IDENTITY)) != 0 ||
626 (r = sshbuf_put_string(msg, blob, blen)) != 0)
627 goto out;
Damien Millerad833b32000-08-23 10:46:23 +1000628 } else {
djm@openbsd.org141efe42015-01-14 20:05:27 +0000629 r = SSH_ERR_INVALID_ARGUMENT;
630 goto out;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000631 }
djm@openbsd.org141efe42015-01-14 20:05:27 +0000632 if ((r = ssh_request_reply(sock, msg, msg)) != 0)
633 goto out;
634 if ((r = sshbuf_get_u8(msg, &type)) != 0)
635 goto out;
636 r = decode_reply(type);
637 out:
638 if (blob != NULL) {
639 explicit_bzero(blob, blen);
640 free(blob);
Damien Millerad833b32000-08-23 10:46:23 +1000641 }
djm@openbsd.org141efe42015-01-14 20:05:27 +0000642 sshbuf_free(msg);
643 return r;
Damien Miller95def091999-11-25 00:26:21 +1100644}
645
djm@openbsd.org141efe42015-01-14 20:05:27 +0000646/*
647 * Add/remove an token-based identity from the authentication server.
648 * This call is intended only for use by ssh-add(1) and like applications.
649 */
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000650int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000651ssh_update_card(int sock, int add, const char *reader_id, const char *pin,
652 u_int life, u_int confirm)
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000653{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000654 struct sshbuf *msg;
655 int r, constrained = (life || confirm);
656 u_char type;
Damien Millerd94f20d2003-06-11 22:06:33 +1000657
658 if (add) {
659 type = constrained ?
660 SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
661 SSH_AGENTC_ADD_SMARTCARD_KEY;
662 } else
663 type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000664
djm@openbsd.org141efe42015-01-14 20:05:27 +0000665 if ((msg = sshbuf_new()) == NULL)
666 return SSH_ERR_ALLOC_FAIL;
667 if ((r = sshbuf_put_u8(msg, type)) != 0 ||
668 (r = sshbuf_put_cstring(msg, reader_id)) != 0 ||
669 (r = sshbuf_put_cstring(msg, pin)) != 0)
670 goto out;
671 if (constrained &&
672 (r = encode_constraints(msg, life, confirm)) != 0)
673 goto out;
674 if ((r = ssh_request_reply(sock, msg, msg)) != 0)
675 goto out;
676 if ((r = sshbuf_get_u8(msg, &type)) != 0)
677 goto out;
678 r = decode_reply(type);
679 out:
680 sshbuf_free(msg);
681 return r;
Ben Lindstrom036a6b22001-07-04 03:50:02 +0000682}
683
Damien Miller5428f641999-11-25 11:54:57 +1100684/*
djm@openbsd.org141efe42015-01-14 20:05:27 +0000685 * Removes all identities from the agent.
686 * This call is intended only for use by ssh-add(1) and like applications.
Damien Miller5428f641999-11-25 11:54:57 +1100687 */
Damien Miller4af51302000-04-16 11:18:38 +1000688int
djm@openbsd.org141efe42015-01-14 20:05:27 +0000689ssh_remove_all_identities(int sock, int version)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000690{
djm@openbsd.org141efe42015-01-14 20:05:27 +0000691 struct sshbuf *msg;
692 u_char type = (version == 1) ?
693 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
694 SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
695 int r;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000696
djm@openbsd.org141efe42015-01-14 20:05:27 +0000697 if ((msg = sshbuf_new()) == NULL)
698 return SSH_ERR_ALLOC_FAIL;
699 if ((r = sshbuf_put_u8(msg, type)) != 0)
700 goto out;
701 if ((r = ssh_request_reply(sock, msg, msg)) != 0)
702 goto out;
703 if ((r = sshbuf_get_u8(msg, &type)) != 0)
704 goto out;
705 r = decode_reply(type);
706 out:
707 sshbuf_free(msg);
708 return r;
Damien Miller95def091999-11-25 00:26:21 +1100709}