Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1 | /* $OpenBSD: ssh-agent.c,v 1.199 2015/03/04 21:12:59 djm Exp $ */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2 | /* |
| 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
| 6 | * The authentication agent program. |
| 7 | * |
| 8 | * 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". |
| 13 | * |
| 14 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
| 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or without |
| 17 | * modification, are permitted provided that the following conditions |
| 18 | * are met: |
| 19 | * 1. Redistributions of source code must retain the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer. |
| 21 | * 2. Redistributions in binary form must reproduce the above copyright |
| 22 | * notice, this list of conditions and the following disclaimer in the |
| 23 | * documentation and/or other materials provided with the distribution. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #include "includes.h" |
| 38 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 39 | #include <sys/param.h> /* MIN MAX */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 40 | #include <sys/types.h> |
| 41 | #include <sys/param.h> |
| 42 | #include <sys/resource.h> |
| 43 | #include <sys/stat.h> |
| 44 | #include <sys/socket.h> |
| 45 | #ifdef HAVE_SYS_TIME_H |
| 46 | # include <sys/time.h> |
| 47 | #endif |
| 48 | #ifdef HAVE_SYS_UN_H |
| 49 | # include <sys/un.h> |
| 50 | #endif |
| 51 | #include "openbsd-compat/sys-queue.h" |
| 52 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 53 | #ifdef WITH_OPENSSL |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 54 | #include <openssl/evp.h> |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 55 | #include "openbsd-compat/openssl-compat.h" |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 56 | #endif |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 57 | |
| 58 | #include <errno.h> |
| 59 | #include <fcntl.h> |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 60 | #include <limits.h> |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 61 | #ifdef HAVE_PATHS_H |
| 62 | # include <paths.h> |
| 63 | #endif |
| 64 | #include <signal.h> |
| 65 | #include <stdarg.h> |
| 66 | #include <stdio.h> |
| 67 | #include <stdlib.h> |
| 68 | #include <time.h> |
| 69 | #include <string.h> |
| 70 | #include <unistd.h> |
| 71 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 72 | #include "key.h" /* XXX for typedef */ |
| 73 | #include "buffer.h" /* XXX for typedef */ |
| 74 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 75 | #include "xmalloc.h" |
| 76 | #include "ssh.h" |
| 77 | #include "rsa.h" |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 78 | #include "sshbuf.h" |
| 79 | #include "sshkey.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 80 | #include "authfd.h" |
| 81 | #include "compat.h" |
| 82 | #include "log.h" |
| 83 | #include "misc.h" |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 84 | #include "digest.h" |
| 85 | #include "ssherr.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 86 | |
| 87 | #ifdef ENABLE_PKCS11 |
| 88 | #include "ssh-pkcs11.h" |
| 89 | #endif |
| 90 | |
| 91 | #if defined(HAVE_SYS_PRCTL_H) |
| 92 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ |
| 93 | #endif |
| 94 | |
| 95 | typedef enum { |
| 96 | AUTH_UNUSED, |
| 97 | AUTH_SOCKET, |
| 98 | AUTH_CONNECTION |
| 99 | } sock_type; |
| 100 | |
| 101 | typedef struct { |
| 102 | int fd; |
| 103 | sock_type type; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 104 | struct sshbuf *input; |
| 105 | struct sshbuf *output; |
| 106 | struct sshbuf *request; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 107 | } SocketEntry; |
| 108 | |
| 109 | u_int sockets_alloc = 0; |
| 110 | SocketEntry *sockets = NULL; |
| 111 | |
| 112 | typedef struct identity { |
| 113 | TAILQ_ENTRY(identity) next; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 114 | struct sshkey *key; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 115 | char *comment; |
| 116 | char *provider; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 117 | time_t death; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 118 | u_int confirm; |
| 119 | } Identity; |
| 120 | |
| 121 | typedef struct { |
| 122 | int nentries; |
| 123 | TAILQ_HEAD(idqueue, identity) idlist; |
| 124 | } Idtab; |
| 125 | |
| 126 | /* private key table, one per protocol version */ |
| 127 | Idtab idtable[3]; |
| 128 | |
| 129 | int max_fd = 0; |
| 130 | |
| 131 | /* pid of shell == parent of agent */ |
| 132 | pid_t parent_pid = -1; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 133 | time_t parent_alive_interval = 0; |
| 134 | |
| 135 | /* pid of process for which cleanup_socket is applicable */ |
| 136 | pid_t cleanup_pid = 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 137 | |
| 138 | /* pathname and directory for AUTH_SOCKET */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 139 | char socket_name[PATH_MAX]; |
| 140 | char socket_dir[PATH_MAX]; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 141 | |
| 142 | /* locking */ |
| 143 | int locked = 0; |
| 144 | char *lock_passwd = NULL; |
| 145 | |
| 146 | extern char *__progname; |
| 147 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 148 | /* Default lifetime in seconds (0 == forever) */ |
| 149 | static long lifetime = 0; |
| 150 | |
| 151 | static int fingerprint_hash = SSH_FP_HASH_DEFAULT; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 152 | |
| 153 | static void |
| 154 | close_socket(SocketEntry *e) |
| 155 | { |
| 156 | close(e->fd); |
| 157 | e->fd = -1; |
| 158 | e->type = AUTH_UNUSED; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 159 | sshbuf_free(e->input); |
| 160 | sshbuf_free(e->output); |
| 161 | sshbuf_free(e->request); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | static void |
| 165 | idtab_init(void) |
| 166 | { |
| 167 | int i; |
| 168 | |
| 169 | for (i = 0; i <=2; i++) { |
| 170 | TAILQ_INIT(&idtable[i].idlist); |
| 171 | idtable[i].nentries = 0; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | /* return private key table for requested protocol version */ |
| 176 | static Idtab * |
| 177 | idtab_lookup(int version) |
| 178 | { |
| 179 | if (version < 1 || version > 2) |
| 180 | fatal("internal error, bad protocol version %d", version); |
| 181 | return &idtable[version]; |
| 182 | } |
| 183 | |
| 184 | static void |
| 185 | free_identity(Identity *id) |
| 186 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 187 | sshkey_free(id->key); |
| 188 | free(id->provider); |
| 189 | free(id->comment); |
| 190 | free(id); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | /* return matching private key for given public key */ |
| 194 | static Identity * |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 195 | lookup_identity(struct sshkey *key, int version) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 196 | { |
| 197 | Identity *id; |
| 198 | |
| 199 | Idtab *tab = idtab_lookup(version); |
| 200 | TAILQ_FOREACH(id, &tab->idlist, next) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 201 | if (sshkey_equal(key, id->key)) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 202 | return (id); |
| 203 | } |
| 204 | return (NULL); |
| 205 | } |
| 206 | |
| 207 | /* Check confirmation of keysign request */ |
| 208 | static int |
| 209 | confirm_key(Identity *id) |
| 210 | { |
| 211 | char *p; |
| 212 | int ret = -1; |
| 213 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 214 | p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT); |
| 215 | if (p != NULL && |
| 216 | ask_permission("Allow use of key %s?\nKey fingerprint %s.", |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 217 | id->comment, p)) |
| 218 | ret = 0; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 219 | free(p); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 220 | |
| 221 | return (ret); |
| 222 | } |
| 223 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 224 | static void |
| 225 | send_status(SocketEntry *e, int success) |
| 226 | { |
| 227 | int r; |
| 228 | |
| 229 | if ((r = sshbuf_put_u32(e->output, 1)) != 0 || |
| 230 | (r = sshbuf_put_u8(e->output, success ? |
| 231 | SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0) |
| 232 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 233 | } |
| 234 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 235 | /* send list of supported public keys to 'client' */ |
| 236 | static void |
| 237 | process_request_identities(SocketEntry *e, int version) |
| 238 | { |
| 239 | Idtab *tab = idtab_lookup(version); |
| 240 | Identity *id; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 241 | struct sshbuf *msg; |
| 242 | int r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 243 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 244 | if ((msg = sshbuf_new()) == NULL) |
| 245 | fatal("%s: sshbuf_new failed", __func__); |
| 246 | if ((r = sshbuf_put_u8(msg, (version == 1) ? |
| 247 | SSH_AGENT_RSA_IDENTITIES_ANSWER : |
| 248 | SSH2_AGENT_IDENTITIES_ANSWER)) != 0 || |
| 249 | (r = sshbuf_put_u32(msg, tab->nentries)) != 0) |
| 250 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 251 | TAILQ_FOREACH(id, &tab->idlist, next) { |
| 252 | if (id->key->type == KEY_RSA1) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 253 | #ifdef WITH_SSH1 |
| 254 | if ((r = sshbuf_put_u32(msg, |
| 255 | BN_num_bits(id->key->rsa->n))) != 0 || |
| 256 | (r = sshbuf_put_bignum1(msg, |
| 257 | id->key->rsa->e)) != 0 || |
| 258 | (r = sshbuf_put_bignum1(msg, |
| 259 | id->key->rsa->n)) != 0) |
| 260 | fatal("%s: buffer error: %s", |
| 261 | __func__, ssh_err(r)); |
| 262 | #endif |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 263 | } else { |
| 264 | u_char *blob; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 265 | size_t blen; |
| 266 | |
| 267 | if ((r = sshkey_to_blob(id->key, &blob, &blen)) != 0) { |
| 268 | error("%s: sshkey_to_blob: %s", __func__, |
| 269 | ssh_err(r)); |
| 270 | continue; |
| 271 | } |
| 272 | if ((r = sshbuf_put_string(msg, blob, blen)) != 0) |
| 273 | fatal("%s: buffer error: %s", |
| 274 | __func__, ssh_err(r)); |
| 275 | free(blob); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 276 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 277 | if ((r = sshbuf_put_cstring(msg, id->comment)) != 0) |
| 278 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 279 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 280 | if ((r = sshbuf_put_stringb(e->output, msg)) != 0) |
| 281 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 282 | sshbuf_free(msg); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 283 | } |
| 284 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 285 | #ifdef WITH_SSH1 |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 286 | /* ssh1 only */ |
| 287 | static void |
| 288 | process_authentication_challenge1(SocketEntry *e) |
| 289 | { |
| 290 | u_char buf[32], mdbuf[16], session_id[16]; |
| 291 | u_int response_type; |
| 292 | BIGNUM *challenge; |
| 293 | Identity *id; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 294 | int r, len; |
| 295 | struct sshbuf *msg; |
| 296 | struct ssh_digest_ctx *md; |
| 297 | struct sshkey *key; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 298 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 299 | if ((msg = sshbuf_new()) == NULL) |
| 300 | fatal("%s: sshbuf_new failed", __func__); |
| 301 | if ((key = sshkey_new(KEY_RSA1)) == NULL) |
| 302 | fatal("%s: sshkey_new failed", __func__); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 303 | if ((challenge = BN_new()) == NULL) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 304 | fatal("%s: BN_new failed", __func__); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 305 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 306 | if ((r = sshbuf_get_u32(e->request, NULL)) != 0 || /* ignored */ |
| 307 | (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 || |
| 308 | (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0 || |
| 309 | (r = sshbuf_get_bignum1(e->request, challenge))) |
| 310 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 311 | |
| 312 | /* Only protocol 1.1 is supported */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 313 | if (sshbuf_len(e->request) == 0) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 314 | goto failure; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 315 | if ((r = sshbuf_get(e->request, session_id, sizeof(session_id))) != 0 || |
| 316 | (r = sshbuf_get_u32(e->request, &response_type)) != 0) |
| 317 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 318 | if (response_type != 1) |
| 319 | goto failure; |
| 320 | |
| 321 | id = lookup_identity(key, 1); |
| 322 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 323 | struct sshkey *private = id->key; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 324 | /* Decrypt the challenge using the private key. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 325 | if ((r = rsa_private_decrypt(challenge, challenge, |
| 326 | private->rsa) != 0)) { |
| 327 | fatal("%s: rsa_public_encrypt: %s", __func__, |
| 328 | ssh_err(r)); |
| 329 | goto failure; /* XXX ? */ |
| 330 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 331 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 332 | /* The response is MD5 of decrypted challenge plus session id */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 333 | len = BN_num_bytes(challenge); |
| 334 | if (len <= 0 || len > 32) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 335 | logit("%s: bad challenge length %d", __func__, len); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 336 | goto failure; |
| 337 | } |
| 338 | memset(buf, 0, 32); |
| 339 | BN_bn2bin(challenge, buf + 32 - len); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 340 | if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL || |
| 341 | ssh_digest_update(md, buf, 32) < 0 || |
| 342 | ssh_digest_update(md, session_id, 16) < 0 || |
| 343 | ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0) |
| 344 | fatal("%s: md5 failed", __func__); |
| 345 | ssh_digest_free(md); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 346 | |
| 347 | /* Send the response. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 348 | if ((r = sshbuf_put_u8(msg, SSH_AGENT_RSA_RESPONSE)) != 0 || |
| 349 | (r = sshbuf_put(msg, mdbuf, sizeof(mdbuf))) != 0) |
| 350 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 351 | goto send; |
| 352 | } |
| 353 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 354 | failure: |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 355 | /* Unknown identity or protocol error. Send failure. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 356 | if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0) |
| 357 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 358 | send: |
| 359 | if ((r = sshbuf_put_stringb(e->output, msg)) != 0) |
| 360 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 361 | sshkey_free(key); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 362 | BN_clear_free(challenge); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 363 | sshbuf_free(msg); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 364 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 365 | #endif |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 366 | |
| 367 | /* ssh2 only */ |
| 368 | static void |
| 369 | process_sign_request2(SocketEntry *e) |
| 370 | { |
| 371 | u_char *blob, *data, *signature = NULL; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 372 | size_t blen, dlen, slen = 0; |
| 373 | u_int compat = 0, flags; |
| 374 | int r, ok = -1; |
| 375 | struct sshbuf *msg; |
| 376 | struct sshkey *key; |
| 377 | struct identity *id; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 378 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 379 | if ((msg = sshbuf_new()) == NULL) |
| 380 | fatal("%s: sshbuf_new failed", __func__); |
| 381 | if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0 || |
| 382 | (r = sshbuf_get_string(e->request, &data, &dlen)) != 0 || |
| 383 | (r = sshbuf_get_u32(e->request, &flags)) != 0) |
| 384 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 385 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 386 | compat = SSH_BUG_SIGBLOB; |
| 387 | if ((r = sshkey_from_blob(blob, blen, &key)) != 0) { |
| 388 | error("%s: cannot parse key blob: %s", __func__, ssh_err(ok)); |
| 389 | goto send; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 390 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 391 | if ((id = lookup_identity(key, 2)) == NULL) { |
| 392 | verbose("%s: %s key not found", __func__, sshkey_type(key)); |
| 393 | goto send; |
| 394 | } |
| 395 | if (id->confirm && confirm_key(id) != 0) { |
| 396 | verbose("%s: user refused key", __func__); |
| 397 | goto send; |
| 398 | } |
| 399 | if ((r = sshkey_sign(id->key, &signature, &slen, |
| 400 | data, dlen, compat)) != 0) { |
| 401 | error("%s: sshkey_sign: %s", __func__, ssh_err(ok)); |
| 402 | goto send; |
| 403 | } |
| 404 | /* Success */ |
| 405 | ok = 0; |
| 406 | send: |
| 407 | sshkey_free(key); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 408 | if (ok == 0) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 409 | if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 || |
| 410 | (r = sshbuf_put_string(msg, signature, slen)) != 0) |
| 411 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 412 | } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0) |
| 413 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 414 | |
| 415 | if ((r = sshbuf_put_stringb(e->output, msg)) != 0) |
| 416 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 417 | |
| 418 | sshbuf_free(msg); |
| 419 | free(data); |
| 420 | free(blob); |
| 421 | free(signature); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 422 | } |
| 423 | |
| 424 | /* shared */ |
| 425 | static void |
| 426 | process_remove_identity(SocketEntry *e, int version) |
| 427 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 428 | size_t blen; |
| 429 | int r, success = 0; |
| 430 | struct sshkey *key = NULL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 431 | u_char *blob; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 432 | #ifdef WITH_SSH1 |
| 433 | u_int bits; |
| 434 | #endif /* WITH_SSH1 */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 435 | |
| 436 | switch (version) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 437 | #ifdef WITH_SSH1 |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 438 | case 1: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 439 | if ((key = sshkey_new(KEY_RSA1)) == NULL) { |
| 440 | error("%s: sshkey_new failed", __func__); |
| 441 | return; |
| 442 | } |
| 443 | if ((r = sshbuf_get_u32(e->request, &bits)) != 0 || |
| 444 | (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 || |
| 445 | (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0) |
| 446 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 447 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 448 | if (bits != sshkey_size(key)) |
| 449 | logit("Warning: identity keysize mismatch: " |
| 450 | "actual %u, announced %u", |
| 451 | sshkey_size(key), bits); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 452 | break; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 453 | #endif /* WITH_SSH1 */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 454 | case 2: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 455 | if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0) |
| 456 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 457 | if ((r = sshkey_from_blob(blob, blen, &key)) != 0) |
| 458 | error("%s: sshkey_from_blob failed: %s", |
| 459 | __func__, ssh_err(r)); |
| 460 | free(blob); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 461 | break; |
| 462 | } |
| 463 | if (key != NULL) { |
| 464 | Identity *id = lookup_identity(key, version); |
| 465 | if (id != NULL) { |
| 466 | /* |
| 467 | * We have this key. Free the old key. Since we |
| 468 | * don't want to leave empty slots in the middle of |
| 469 | * the array, we actually free the key there and move |
| 470 | * all the entries between the empty slot and the end |
| 471 | * of the array. |
| 472 | */ |
| 473 | Idtab *tab = idtab_lookup(version); |
| 474 | if (tab->nentries < 1) |
| 475 | fatal("process_remove_identity: " |
| 476 | "internal error: tab->nentries %d", |
| 477 | tab->nentries); |
| 478 | TAILQ_REMOVE(&tab->idlist, id, next); |
| 479 | free_identity(id); |
| 480 | tab->nentries--; |
| 481 | success = 1; |
| 482 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 483 | sshkey_free(key); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 484 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 485 | send_status(e, success); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | static void |
| 489 | process_remove_all_identities(SocketEntry *e, int version) |
| 490 | { |
| 491 | Idtab *tab = idtab_lookup(version); |
| 492 | Identity *id; |
| 493 | |
| 494 | /* Loop over all identities and clear the keys. */ |
| 495 | for (id = TAILQ_FIRST(&tab->idlist); id; |
| 496 | id = TAILQ_FIRST(&tab->idlist)) { |
| 497 | TAILQ_REMOVE(&tab->idlist, id, next); |
| 498 | free_identity(id); |
| 499 | } |
| 500 | |
| 501 | /* Mark that there are no identities. */ |
| 502 | tab->nentries = 0; |
| 503 | |
| 504 | /* Send success. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 505 | send_status(e, 1); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 506 | } |
| 507 | |
| 508 | /* removes expired keys and returns number of seconds until the next expiry */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 509 | static time_t |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 510 | reaper(void) |
| 511 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 512 | time_t deadline = 0, now = monotime(); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 513 | Identity *id, *nxt; |
| 514 | int version; |
| 515 | Idtab *tab; |
| 516 | |
| 517 | for (version = 1; version < 3; version++) { |
| 518 | tab = idtab_lookup(version); |
| 519 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { |
| 520 | nxt = TAILQ_NEXT(id, next); |
| 521 | if (id->death == 0) |
| 522 | continue; |
| 523 | if (now >= id->death) { |
| 524 | debug("expiring key '%s'", id->comment); |
| 525 | TAILQ_REMOVE(&tab->idlist, id, next); |
| 526 | free_identity(id); |
| 527 | tab->nentries--; |
| 528 | } else |
| 529 | deadline = (deadline == 0) ? id->death : |
| 530 | MIN(deadline, id->death); |
| 531 | } |
| 532 | } |
| 533 | if (deadline == 0 || deadline <= now) |
| 534 | return 0; |
| 535 | else |
| 536 | return (deadline - now); |
| 537 | } |
| 538 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 539 | /* |
| 540 | * XXX this and the corresponding serialisation function probably belongs |
| 541 | * in key.c |
| 542 | */ |
| 543 | #ifdef WITH_SSH1 |
| 544 | static int |
| 545 | agent_decode_rsa1(struct sshbuf *m, struct sshkey **kp) |
| 546 | { |
| 547 | struct sshkey *k = NULL; |
| 548 | int r = SSH_ERR_INTERNAL_ERROR; |
| 549 | |
| 550 | *kp = NULL; |
| 551 | if ((k = sshkey_new_private(KEY_RSA1)) == NULL) |
| 552 | return SSH_ERR_ALLOC_FAIL; |
| 553 | |
| 554 | if ((r = sshbuf_get_u32(m, NULL)) != 0 || /* ignored */ |
| 555 | (r = sshbuf_get_bignum1(m, k->rsa->n)) != 0 || |
| 556 | (r = sshbuf_get_bignum1(m, k->rsa->e)) != 0 || |
| 557 | (r = sshbuf_get_bignum1(m, k->rsa->d)) != 0 || |
| 558 | (r = sshbuf_get_bignum1(m, k->rsa->iqmp)) != 0 || |
| 559 | /* SSH1 and SSL have p and q swapped */ |
| 560 | (r = sshbuf_get_bignum1(m, k->rsa->q)) != 0 || /* p */ |
| 561 | (r = sshbuf_get_bignum1(m, k->rsa->p)) != 0) /* q */ |
| 562 | goto out; |
| 563 | |
| 564 | /* Generate additional parameters */ |
| 565 | if ((r = rsa_generate_additional_parameters(k->rsa)) != 0) |
| 566 | goto out; |
| 567 | /* enable blinding */ |
| 568 | if (RSA_blinding_on(k->rsa, NULL) != 1) { |
| 569 | r = SSH_ERR_LIBCRYPTO_ERROR; |
| 570 | goto out; |
| 571 | } |
| 572 | |
| 573 | r = 0; /* success */ |
| 574 | out: |
| 575 | if (r == 0) |
| 576 | *kp = k; |
| 577 | else |
| 578 | sshkey_free(k); |
| 579 | return r; |
| 580 | } |
| 581 | #endif /* WITH_SSH1 */ |
| 582 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 583 | static void |
| 584 | process_add_identity(SocketEntry *e, int version) |
| 585 | { |
| 586 | Idtab *tab = idtab_lookup(version); |
| 587 | Identity *id; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 588 | int success = 0, confirm = 0; |
| 589 | u_int seconds; |
| 590 | char *comment = NULL; |
| 591 | time_t death = 0; |
| 592 | struct sshkey *k = NULL; |
| 593 | u_char ctype; |
| 594 | int r = SSH_ERR_INTERNAL_ERROR; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 595 | |
| 596 | switch (version) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 597 | #ifdef WITH_SSH1 |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 598 | case 1: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 599 | r = agent_decode_rsa1(e->request, &k); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 600 | break; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 601 | #endif /* WITH_SSH1 */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 602 | case 2: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 603 | r = sshkey_private_deserialize(e->request, &k); |
| 604 | break; |
| 605 | } |
| 606 | if (r != 0 || k == NULL || |
| 607 | (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) { |
| 608 | error("%s: decode private key: %s", __func__, ssh_err(r)); |
| 609 | goto err; |
| 610 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 611 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 612 | while (sshbuf_len(e->request)) { |
| 613 | if ((r = sshbuf_get_u8(e->request, &ctype)) != 0) { |
| 614 | error("%s: buffer error: %s", __func__, ssh_err(r)); |
| 615 | goto err; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 616 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 617 | switch (ctype) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 618 | case SSH_AGENT_CONSTRAIN_LIFETIME: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 619 | if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) { |
| 620 | error("%s: bad lifetime constraint: %s", |
| 621 | __func__, ssh_err(r)); |
| 622 | goto err; |
| 623 | } |
| 624 | death = monotime() + seconds; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 625 | break; |
| 626 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
| 627 | confirm = 1; |
| 628 | break; |
| 629 | default: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 630 | error("%s: Unknown constraint %d", __func__, ctype); |
| 631 | err: |
| 632 | sshbuf_reset(e->request); |
| 633 | free(comment); |
| 634 | sshkey_free(k); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 635 | goto send; |
| 636 | } |
| 637 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 638 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 639 | success = 1; |
| 640 | if (lifetime && !death) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 641 | death = monotime() + lifetime; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 642 | if ((id = lookup_identity(k, version)) == NULL) { |
| 643 | id = xcalloc(1, sizeof(Identity)); |
| 644 | id->key = k; |
| 645 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
| 646 | /* Increment the number of identities. */ |
| 647 | tab->nentries++; |
| 648 | } else { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 649 | sshkey_free(k); |
| 650 | free(id->comment); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 651 | } |
| 652 | id->comment = comment; |
| 653 | id->death = death; |
| 654 | id->confirm = confirm; |
| 655 | send: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 656 | send_status(e, success); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 657 | } |
| 658 | |
| 659 | /* XXX todo: encrypt sensitive data with passphrase */ |
| 660 | static void |
| 661 | process_lock_agent(SocketEntry *e, int lock) |
| 662 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 663 | int r, success = 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 664 | char *passwd; |
| 665 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 666 | if ((r = sshbuf_get_cstring(e->request, &passwd, NULL)) != 0) |
| 667 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 668 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { |
| 669 | locked = 0; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 670 | explicit_bzero(lock_passwd, strlen(lock_passwd)); |
| 671 | free(lock_passwd); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 672 | lock_passwd = NULL; |
| 673 | success = 1; |
| 674 | } else if (!locked && lock) { |
| 675 | locked = 1; |
| 676 | lock_passwd = xstrdup(passwd); |
| 677 | success = 1; |
| 678 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 679 | explicit_bzero(passwd, strlen(passwd)); |
| 680 | free(passwd); |
| 681 | send_status(e, success); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 682 | } |
| 683 | |
| 684 | static void |
| 685 | no_identities(SocketEntry *e, u_int type) |
| 686 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 687 | struct sshbuf *msg; |
| 688 | int r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 689 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 690 | if ((msg = sshbuf_new()) == NULL) |
| 691 | fatal("%s: sshbuf_new failed", __func__); |
| 692 | if ((r = sshbuf_put_u8(msg, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 693 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 694 | SSH_AGENT_RSA_IDENTITIES_ANSWER : |
| 695 | SSH2_AGENT_IDENTITIES_ANSWER)) != 0 || |
| 696 | (r = sshbuf_put_u32(msg, 0)) != 0 || |
| 697 | (r = sshbuf_put_stringb(e->output, msg)) != 0) |
| 698 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 699 | sshbuf_free(msg); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | #ifdef ENABLE_PKCS11 |
| 703 | static void |
| 704 | process_add_smartcard_key(SocketEntry *e) |
| 705 | { |
| 706 | char *provider = NULL, *pin; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 707 | int r, i, version, count = 0, success = 0, confirm = 0; |
| 708 | u_int seconds; |
| 709 | time_t death = 0; |
| 710 | u_char type; |
| 711 | struct sshkey **keys = NULL, *k; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 712 | Identity *id; |
| 713 | Idtab *tab; |
| 714 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 715 | if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 || |
| 716 | (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) |
| 717 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 718 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 719 | while (sshbuf_len(e->request)) { |
| 720 | if ((r = sshbuf_get_u8(e->request, &type)) != 0) |
| 721 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 722 | switch (type) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 723 | case SSH_AGENT_CONSTRAIN_LIFETIME: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 724 | if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) |
| 725 | fatal("%s: buffer error: %s", |
| 726 | __func__, ssh_err(r)); |
| 727 | death = monotime() + seconds; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 728 | break; |
| 729 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
| 730 | confirm = 1; |
| 731 | break; |
| 732 | default: |
| 733 | error("process_add_smartcard_key: " |
| 734 | "Unknown constraint type %d", type); |
| 735 | goto send; |
| 736 | } |
| 737 | } |
| 738 | if (lifetime && !death) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 739 | death = monotime() + lifetime; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 740 | |
| 741 | count = pkcs11_add_provider(provider, pin, &keys); |
| 742 | for (i = 0; i < count; i++) { |
| 743 | k = keys[i]; |
| 744 | version = k->type == KEY_RSA1 ? 1 : 2; |
| 745 | tab = idtab_lookup(version); |
| 746 | if (lookup_identity(k, version) == NULL) { |
| 747 | id = xcalloc(1, sizeof(Identity)); |
| 748 | id->key = k; |
| 749 | id->provider = xstrdup(provider); |
| 750 | id->comment = xstrdup(provider); /* XXX */ |
| 751 | id->death = death; |
| 752 | id->confirm = confirm; |
| 753 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
| 754 | tab->nentries++; |
| 755 | success = 1; |
| 756 | } else { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 757 | sshkey_free(k); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 758 | } |
| 759 | keys[i] = NULL; |
| 760 | } |
| 761 | send: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 762 | free(pin); |
| 763 | free(provider); |
| 764 | free(keys); |
| 765 | send_status(e, success); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 766 | } |
| 767 | |
| 768 | static void |
| 769 | process_remove_smartcard_key(SocketEntry *e) |
| 770 | { |
| 771 | char *provider = NULL, *pin = NULL; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 772 | int r, version, success = 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 773 | Identity *id, *nxt; |
| 774 | Idtab *tab; |
| 775 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 776 | if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 || |
| 777 | (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) |
| 778 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 779 | free(pin); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 780 | |
| 781 | for (version = 1; version < 3; version++) { |
| 782 | tab = idtab_lookup(version); |
| 783 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { |
| 784 | nxt = TAILQ_NEXT(id, next); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 785 | /* Skip file--based keys */ |
| 786 | if (id->provider == NULL) |
| 787 | continue; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 788 | if (!strcmp(provider, id->provider)) { |
| 789 | TAILQ_REMOVE(&tab->idlist, id, next); |
| 790 | free_identity(id); |
| 791 | tab->nentries--; |
| 792 | } |
| 793 | } |
| 794 | } |
| 795 | if (pkcs11_del_provider(provider) == 0) |
| 796 | success = 1; |
| 797 | else |
| 798 | error("process_remove_smartcard_key:" |
| 799 | " pkcs11_del_provider failed"); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 800 | free(provider); |
| 801 | send_status(e, success); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 802 | } |
| 803 | #endif /* ENABLE_PKCS11 */ |
| 804 | |
| 805 | /* dispatch incoming messages */ |
| 806 | |
| 807 | static void |
| 808 | process_message(SocketEntry *e) |
| 809 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 810 | u_int msg_len; |
| 811 | u_char type; |
| 812 | const u_char *cp; |
| 813 | int r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 814 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 815 | if (sshbuf_len(e->input) < 5) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 816 | return; /* Incomplete message. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 817 | cp = sshbuf_ptr(e->input); |
| 818 | msg_len = PEEK_U32(cp); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 819 | if (msg_len > 256 * 1024) { |
| 820 | close_socket(e); |
| 821 | return; |
| 822 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 823 | if (sshbuf_len(e->input) < msg_len + 4) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 824 | return; |
| 825 | |
| 826 | /* move the current input to e->request */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 827 | sshbuf_reset(e->request); |
| 828 | if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 || |
| 829 | (r = sshbuf_get_u8(e->request, &type)) != 0) |
| 830 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 831 | |
| 832 | /* check wheter agent is locked */ |
| 833 | if (locked && type != SSH_AGENTC_UNLOCK) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 834 | sshbuf_reset(e->request); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 835 | switch (type) { |
| 836 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: |
| 837 | case SSH2_AGENTC_REQUEST_IDENTITIES: |
| 838 | /* send empty lists */ |
| 839 | no_identities(e, type); |
| 840 | break; |
| 841 | default: |
| 842 | /* send a fail message for all other request types */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 843 | send_status(e, 0); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 844 | } |
| 845 | return; |
| 846 | } |
| 847 | |
| 848 | debug("type %d", type); |
| 849 | switch (type) { |
| 850 | case SSH_AGENTC_LOCK: |
| 851 | case SSH_AGENTC_UNLOCK: |
| 852 | process_lock_agent(e, type == SSH_AGENTC_LOCK); |
| 853 | break; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 854 | #ifdef WITH_SSH1 |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 855 | /* ssh1 */ |
| 856 | case SSH_AGENTC_RSA_CHALLENGE: |
| 857 | process_authentication_challenge1(e); |
| 858 | break; |
| 859 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: |
| 860 | process_request_identities(e, 1); |
| 861 | break; |
| 862 | case SSH_AGENTC_ADD_RSA_IDENTITY: |
| 863 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
| 864 | process_add_identity(e, 1); |
| 865 | break; |
| 866 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: |
| 867 | process_remove_identity(e, 1); |
| 868 | break; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 869 | #endif |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 870 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 871 | process_remove_all_identities(e, 1); /* safe for !WITH_SSH1 */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 872 | break; |
| 873 | /* ssh2 */ |
| 874 | case SSH2_AGENTC_SIGN_REQUEST: |
| 875 | process_sign_request2(e); |
| 876 | break; |
| 877 | case SSH2_AGENTC_REQUEST_IDENTITIES: |
| 878 | process_request_identities(e, 2); |
| 879 | break; |
| 880 | case SSH2_AGENTC_ADD_IDENTITY: |
| 881 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
| 882 | process_add_identity(e, 2); |
| 883 | break; |
| 884 | case SSH2_AGENTC_REMOVE_IDENTITY: |
| 885 | process_remove_identity(e, 2); |
| 886 | break; |
| 887 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: |
| 888 | process_remove_all_identities(e, 2); |
| 889 | break; |
| 890 | #ifdef ENABLE_PKCS11 |
| 891 | case SSH_AGENTC_ADD_SMARTCARD_KEY: |
| 892 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: |
| 893 | process_add_smartcard_key(e); |
| 894 | break; |
| 895 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
| 896 | process_remove_smartcard_key(e); |
| 897 | break; |
| 898 | #endif /* ENABLE_PKCS11 */ |
| 899 | default: |
| 900 | /* Unknown message. Respond with failure. */ |
| 901 | error("Unknown message %d", type); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 902 | sshbuf_reset(e->request); |
| 903 | send_status(e, 0); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 904 | break; |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | static void |
| 909 | new_socket(sock_type type, int fd) |
| 910 | { |
| 911 | u_int i, old_alloc, new_alloc; |
| 912 | |
| 913 | set_nonblock(fd); |
| 914 | |
| 915 | if (fd > max_fd) |
| 916 | max_fd = fd; |
| 917 | |
| 918 | for (i = 0; i < sockets_alloc; i++) |
| 919 | if (sockets[i].type == AUTH_UNUSED) { |
| 920 | sockets[i].fd = fd; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 921 | if ((sockets[i].input = sshbuf_new()) == NULL) |
| 922 | fatal("%s: sshbuf_new failed", __func__); |
| 923 | if ((sockets[i].output = sshbuf_new()) == NULL) |
| 924 | fatal("%s: sshbuf_new failed", __func__); |
| 925 | if ((sockets[i].request = sshbuf_new()) == NULL) |
| 926 | fatal("%s: sshbuf_new failed", __func__); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 927 | sockets[i].type = type; |
| 928 | return; |
| 929 | } |
| 930 | old_alloc = sockets_alloc; |
| 931 | new_alloc = sockets_alloc + 10; |
| 932 | sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); |
| 933 | for (i = old_alloc; i < new_alloc; i++) |
| 934 | sockets[i].type = AUTH_UNUSED; |
| 935 | sockets_alloc = new_alloc; |
| 936 | sockets[old_alloc].fd = fd; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 937 | if ((sockets[old_alloc].input = sshbuf_new()) == NULL) |
| 938 | fatal("%s: sshbuf_new failed", __func__); |
| 939 | if ((sockets[old_alloc].output = sshbuf_new()) == NULL) |
| 940 | fatal("%s: sshbuf_new failed", __func__); |
| 941 | if ((sockets[old_alloc].request = sshbuf_new()) == NULL) |
| 942 | fatal("%s: sshbuf_new failed", __func__); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 943 | sockets[old_alloc].type = type; |
| 944 | } |
| 945 | |
| 946 | static int |
| 947 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp, |
| 948 | struct timeval **tvpp) |
| 949 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 950 | u_int i, sz; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 951 | int n = 0; |
| 952 | static struct timeval tv; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 953 | time_t deadline; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 954 | |
| 955 | for (i = 0; i < sockets_alloc; i++) { |
| 956 | switch (sockets[i].type) { |
| 957 | case AUTH_SOCKET: |
| 958 | case AUTH_CONNECTION: |
| 959 | n = MAX(n, sockets[i].fd); |
| 960 | break; |
| 961 | case AUTH_UNUSED: |
| 962 | break; |
| 963 | default: |
| 964 | fatal("Unknown socket type %d", sockets[i].type); |
| 965 | break; |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); |
| 970 | if (*fdrp == NULL || sz > *nallocp) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 971 | free(*fdrp); |
| 972 | free(*fdwp); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 973 | *fdrp = xmalloc(sz); |
| 974 | *fdwp = xmalloc(sz); |
| 975 | *nallocp = sz; |
| 976 | } |
| 977 | if (n < *fdl) |
| 978 | debug("XXX shrink: %d < %d", n, *fdl); |
| 979 | *fdl = n; |
| 980 | memset(*fdrp, 0, sz); |
| 981 | memset(*fdwp, 0, sz); |
| 982 | |
| 983 | for (i = 0; i < sockets_alloc; i++) { |
| 984 | switch (sockets[i].type) { |
| 985 | case AUTH_SOCKET: |
| 986 | case AUTH_CONNECTION: |
| 987 | FD_SET(sockets[i].fd, *fdrp); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 988 | if (sshbuf_len(sockets[i].output) > 0) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 989 | FD_SET(sockets[i].fd, *fdwp); |
| 990 | break; |
| 991 | default: |
| 992 | break; |
| 993 | } |
| 994 | } |
| 995 | deadline = reaper(); |
| 996 | if (parent_alive_interval != 0) |
| 997 | deadline = (deadline == 0) ? parent_alive_interval : |
| 998 | MIN(deadline, parent_alive_interval); |
| 999 | if (deadline == 0) { |
| 1000 | *tvpp = NULL; |
| 1001 | } else { |
| 1002 | tv.tv_sec = deadline; |
| 1003 | tv.tv_usec = 0; |
| 1004 | *tvpp = &tv; |
| 1005 | } |
| 1006 | return (1); |
| 1007 | } |
| 1008 | |
| 1009 | static void |
| 1010 | after_select(fd_set *readset, fd_set *writeset) |
| 1011 | { |
| 1012 | struct sockaddr_un sunaddr; |
| 1013 | socklen_t slen; |
| 1014 | char buf[1024]; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1015 | int len, sock, r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1016 | u_int i, orig_alloc; |
| 1017 | uid_t euid; |
| 1018 | gid_t egid; |
| 1019 | |
| 1020 | for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++) |
| 1021 | switch (sockets[i].type) { |
| 1022 | case AUTH_UNUSED: |
| 1023 | break; |
| 1024 | case AUTH_SOCKET: |
| 1025 | if (FD_ISSET(sockets[i].fd, readset)) { |
| 1026 | slen = sizeof(sunaddr); |
| 1027 | sock = accept(sockets[i].fd, |
| 1028 | (struct sockaddr *)&sunaddr, &slen); |
| 1029 | if (sock < 0) { |
| 1030 | error("accept from AUTH_SOCKET: %s", |
| 1031 | strerror(errno)); |
| 1032 | break; |
| 1033 | } |
| 1034 | if (getpeereid(sock, &euid, &egid) < 0) { |
| 1035 | error("getpeereid %d failed: %s", |
| 1036 | sock, strerror(errno)); |
| 1037 | close(sock); |
| 1038 | break; |
| 1039 | } |
| 1040 | if ((euid != 0) && (getuid() != euid)) { |
| 1041 | error("uid mismatch: " |
| 1042 | "peer euid %u != uid %u", |
| 1043 | (u_int) euid, (u_int) getuid()); |
| 1044 | close(sock); |
| 1045 | break; |
| 1046 | } |
| 1047 | new_socket(AUTH_CONNECTION, sock); |
| 1048 | } |
| 1049 | break; |
| 1050 | case AUTH_CONNECTION: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1051 | if (sshbuf_len(sockets[i].output) > 0 && |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1052 | FD_ISSET(sockets[i].fd, writeset)) { |
| 1053 | len = write(sockets[i].fd, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1054 | sshbuf_ptr(sockets[i].output), |
| 1055 | sshbuf_len(sockets[i].output)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1056 | if (len == -1 && (errno == EAGAIN || |
| 1057 | errno == EWOULDBLOCK || |
| 1058 | errno == EINTR)) |
| 1059 | continue; |
| 1060 | if (len <= 0) { |
| 1061 | close_socket(&sockets[i]); |
| 1062 | break; |
| 1063 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1064 | if ((r = sshbuf_consume(sockets[i].output, |
| 1065 | len)) != 0) |
| 1066 | fatal("%s: buffer error: %s", |
| 1067 | __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1068 | } |
| 1069 | if (FD_ISSET(sockets[i].fd, readset)) { |
| 1070 | len = read(sockets[i].fd, buf, sizeof(buf)); |
| 1071 | if (len == -1 && (errno == EAGAIN || |
| 1072 | errno == EWOULDBLOCK || |
| 1073 | errno == EINTR)) |
| 1074 | continue; |
| 1075 | if (len <= 0) { |
| 1076 | close_socket(&sockets[i]); |
| 1077 | break; |
| 1078 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1079 | if ((r = sshbuf_put(sockets[i].input, |
| 1080 | buf, len)) != 0) |
| 1081 | fatal("%s: buffer error: %s", |
| 1082 | __func__, ssh_err(r)); |
| 1083 | explicit_bzero(buf, sizeof(buf)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1084 | process_message(&sockets[i]); |
| 1085 | } |
| 1086 | break; |
| 1087 | default: |
| 1088 | fatal("Unknown type %d", sockets[i].type); |
| 1089 | } |
| 1090 | } |
| 1091 | |
| 1092 | static void |
| 1093 | cleanup_socket(void) |
| 1094 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1095 | if (cleanup_pid != 0 && getpid() != cleanup_pid) |
| 1096 | return; |
| 1097 | debug("%s: cleanup", __func__); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1098 | if (socket_name[0]) |
| 1099 | unlink(socket_name); |
| 1100 | if (socket_dir[0]) |
| 1101 | rmdir(socket_dir); |
| 1102 | } |
| 1103 | |
| 1104 | void |
| 1105 | cleanup_exit(int i) |
| 1106 | { |
| 1107 | cleanup_socket(); |
| 1108 | _exit(i); |
| 1109 | } |
| 1110 | |
| 1111 | /*ARGSUSED*/ |
| 1112 | static void |
| 1113 | cleanup_handler(int sig) |
| 1114 | { |
| 1115 | cleanup_socket(); |
| 1116 | #ifdef ENABLE_PKCS11 |
| 1117 | pkcs11_terminate(); |
| 1118 | #endif |
| 1119 | _exit(2); |
| 1120 | } |
| 1121 | |
| 1122 | static void |
| 1123 | check_parent_exists(void) |
| 1124 | { |
| 1125 | /* |
| 1126 | * If our parent has exited then getppid() will return (pid_t)1, |
| 1127 | * so testing for that should be safe. |
| 1128 | */ |
| 1129 | if (parent_pid != -1 && getppid() != parent_pid) { |
| 1130 | /* printf("Parent has died - Authentication agent exiting.\n"); */ |
| 1131 | cleanup_socket(); |
| 1132 | _exit(2); |
| 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | static void |
| 1137 | usage(void) |
| 1138 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1139 | fprintf(stderr, |
| 1140 | "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-E fingerprint_hash]\n" |
| 1141 | " [-t life] [command [arg ...]]\n" |
| 1142 | " ssh-agent [-c | -s] -k\n"); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1143 | exit(1); |
| 1144 | } |
| 1145 | |
| 1146 | int |
| 1147 | main(int ac, char **av) |
| 1148 | { |
| 1149 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; |
| 1150 | int sock, fd, ch, result, saved_errno; |
| 1151 | u_int nalloc; |
| 1152 | char *shell, *format, *pidstr, *agentsocket = NULL; |
| 1153 | fd_set *readsetp = NULL, *writesetp = NULL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1154 | #ifdef HAVE_SETRLIMIT |
| 1155 | struct rlimit rlim; |
| 1156 | #endif |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1157 | extern int optind; |
| 1158 | extern char *optarg; |
| 1159 | pid_t pid; |
| 1160 | char pidstrbuf[1 + 3 * sizeof pid]; |
| 1161 | struct timeval *tvp = NULL; |
| 1162 | size_t len; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1163 | mode_t prev_mask; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1164 | |
| 1165 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| 1166 | sanitise_stdfd(); |
| 1167 | |
| 1168 | /* drop */ |
| 1169 | setegid(getgid()); |
| 1170 | setgid(getgid()); |
| 1171 | |
| 1172 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) |
| 1173 | /* Disable ptrace on Linux without sgid bit */ |
| 1174 | prctl(PR_SET_DUMPABLE, 0); |
| 1175 | #endif |
| 1176 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1177 | #ifdef WITH_OPENSSL |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1178 | OpenSSL_add_all_algorithms(); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1179 | #endif |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1180 | |
| 1181 | __progname = ssh_get_progname(av[0]); |
| 1182 | seed_rng(); |
| 1183 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1184 | while ((ch = getopt(ac, av, "cdksE:a:t:")) != -1) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1185 | switch (ch) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1186 | case 'E': |
| 1187 | fingerprint_hash = ssh_digest_alg_by_name(optarg); |
| 1188 | if (fingerprint_hash == -1) |
| 1189 | fatal("Invalid hash algorithm \"%s\"", optarg); |
| 1190 | break; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1191 | case 'c': |
| 1192 | if (s_flag) |
| 1193 | usage(); |
| 1194 | c_flag++; |
| 1195 | break; |
| 1196 | case 'k': |
| 1197 | k_flag++; |
| 1198 | break; |
| 1199 | case 's': |
| 1200 | if (c_flag) |
| 1201 | usage(); |
| 1202 | s_flag++; |
| 1203 | break; |
| 1204 | case 'd': |
| 1205 | if (d_flag) |
| 1206 | usage(); |
| 1207 | d_flag++; |
| 1208 | break; |
| 1209 | case 'a': |
| 1210 | agentsocket = optarg; |
| 1211 | break; |
| 1212 | case 't': |
| 1213 | if ((lifetime = convtime(optarg)) == -1) { |
| 1214 | fprintf(stderr, "Invalid lifetime\n"); |
| 1215 | usage(); |
| 1216 | } |
| 1217 | break; |
| 1218 | default: |
| 1219 | usage(); |
| 1220 | } |
| 1221 | } |
| 1222 | ac -= optind; |
| 1223 | av += optind; |
| 1224 | |
| 1225 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
| 1226 | usage(); |
| 1227 | |
| 1228 | if (ac == 0 && !c_flag && !s_flag) { |
| 1229 | shell = getenv("SHELL"); |
| 1230 | if (shell != NULL && (len = strlen(shell)) > 2 && |
| 1231 | strncmp(shell + len - 3, "csh", 3) == 0) |
| 1232 | c_flag = 1; |
| 1233 | } |
| 1234 | if (k_flag) { |
| 1235 | const char *errstr = NULL; |
| 1236 | |
| 1237 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
| 1238 | if (pidstr == NULL) { |
| 1239 | fprintf(stderr, "%s not set, cannot kill agent\n", |
| 1240 | SSH_AGENTPID_ENV_NAME); |
| 1241 | exit(1); |
| 1242 | } |
| 1243 | pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); |
| 1244 | if (errstr) { |
| 1245 | fprintf(stderr, |
| 1246 | "%s=\"%s\", which is not a good PID: %s\n", |
| 1247 | SSH_AGENTPID_ENV_NAME, pidstr, errstr); |
| 1248 | exit(1); |
| 1249 | } |
| 1250 | if (kill(pid, SIGTERM) == -1) { |
| 1251 | perror("kill"); |
| 1252 | exit(1); |
| 1253 | } |
| 1254 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; |
| 1255 | printf(format, SSH_AUTHSOCKET_ENV_NAME); |
| 1256 | printf(format, SSH_AGENTPID_ENV_NAME); |
| 1257 | printf("echo Agent pid %ld killed;\n", (long)pid); |
| 1258 | exit(0); |
| 1259 | } |
| 1260 | parent_pid = getpid(); |
| 1261 | |
| 1262 | if (agentsocket == NULL) { |
| 1263 | /* Create private directory for agent socket */ |
| 1264 | mktemp_proto(socket_dir, sizeof(socket_dir)); |
| 1265 | if (mkdtemp(socket_dir) == NULL) { |
| 1266 | perror("mkdtemp: private socket dir"); |
| 1267 | exit(1); |
| 1268 | } |
| 1269 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
| 1270 | (long)parent_pid); |
| 1271 | } else { |
| 1272 | /* Try to use specified agent socket */ |
| 1273 | socket_dir[0] = '\0'; |
| 1274 | strlcpy(socket_name, agentsocket, sizeof socket_name); |
| 1275 | } |
| 1276 | |
| 1277 | /* |
| 1278 | * Create socket early so it will exist before command gets run from |
| 1279 | * the parent. |
| 1280 | */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1281 | prev_mask = umask(0177); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1282 | sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0); |
| 1283 | if (sock < 0) { |
| 1284 | /* XXX - unix_listener() calls error() not perror() */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1285 | *socket_name = '\0'; /* Don't unlink any existing file */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1286 | cleanup_exit(1); |
| 1287 | } |
| 1288 | umask(prev_mask); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1289 | |
| 1290 | /* |
| 1291 | * Fork, and have the parent execute the command, if any, or present |
| 1292 | * the socket data. The child continues as the authentication agent. |
| 1293 | */ |
| 1294 | if (d_flag) { |
| 1295 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); |
| 1296 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; |
| 1297 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, |
| 1298 | SSH_AUTHSOCKET_ENV_NAME); |
| 1299 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
| 1300 | goto skip; |
| 1301 | } |
| 1302 | pid = fork(); |
| 1303 | if (pid == -1) { |
| 1304 | perror("fork"); |
| 1305 | cleanup_exit(1); |
| 1306 | } |
| 1307 | if (pid != 0) { /* Parent - execute the given command. */ |
| 1308 | close(sock); |
| 1309 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
| 1310 | if (ac == 0) { |
| 1311 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; |
| 1312 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, |
| 1313 | SSH_AUTHSOCKET_ENV_NAME); |
| 1314 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
| 1315 | SSH_AGENTPID_ENV_NAME); |
| 1316 | printf("echo Agent pid %ld;\n", (long)pid); |
| 1317 | exit(0); |
| 1318 | } |
| 1319 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
| 1320 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { |
| 1321 | perror("setenv"); |
| 1322 | exit(1); |
| 1323 | } |
| 1324 | execvp(av[0], av); |
| 1325 | perror(av[0]); |
| 1326 | exit(1); |
| 1327 | } |
| 1328 | /* child */ |
| 1329 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); |
| 1330 | |
| 1331 | if (setsid() == -1) { |
| 1332 | error("setsid: %s", strerror(errno)); |
| 1333 | cleanup_exit(1); |
| 1334 | } |
| 1335 | |
| 1336 | (void)chdir("/"); |
| 1337 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
| 1338 | /* XXX might close listen socket */ |
| 1339 | (void)dup2(fd, STDIN_FILENO); |
| 1340 | (void)dup2(fd, STDOUT_FILENO); |
| 1341 | (void)dup2(fd, STDERR_FILENO); |
| 1342 | if (fd > 2) |
| 1343 | close(fd); |
| 1344 | } |
| 1345 | |
| 1346 | #ifdef HAVE_SETRLIMIT |
| 1347 | /* deny core dumps, since memory contains unencrypted private keys */ |
| 1348 | rlim.rlim_cur = rlim.rlim_max = 0; |
| 1349 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { |
| 1350 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
| 1351 | cleanup_exit(1); |
| 1352 | } |
| 1353 | #endif |
| 1354 | |
| 1355 | skip: |
| 1356 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1357 | cleanup_pid = getpid(); |
| 1358 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1359 | #ifdef ENABLE_PKCS11 |
| 1360 | pkcs11_init(0); |
| 1361 | #endif |
| 1362 | new_socket(AUTH_SOCKET, sock); |
| 1363 | if (ac > 0) |
| 1364 | parent_alive_interval = 10; |
| 1365 | idtab_init(); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1366 | signal(SIGPIPE, SIG_IGN); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1367 | signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1368 | signal(SIGHUP, cleanup_handler); |
| 1369 | signal(SIGTERM, cleanup_handler); |
| 1370 | nalloc = 0; |
| 1371 | |
| 1372 | while (1) { |
| 1373 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp); |
| 1374 | result = select(max_fd + 1, readsetp, writesetp, NULL, tvp); |
| 1375 | saved_errno = errno; |
| 1376 | if (parent_alive_interval != 0) |
| 1377 | check_parent_exists(); |
| 1378 | (void) reaper(); /* remove expired keys */ |
| 1379 | if (result < 0) { |
| 1380 | if (saved_errno == EINTR) |
| 1381 | continue; |
| 1382 | fatal("select: %s", strerror(saved_errno)); |
| 1383 | } else if (result > 0) |
| 1384 | after_select(readsetp, writesetp); |
| 1385 | } |
| 1386 | /* NOTREACHED */ |
| 1387 | } |