Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.187
1.187 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.186 2014/06/24 01:13:21 djm Exp $ */
1.1 deraadt 2: /*
1.22 deraadt 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.
1.33 markus 7: *
1.35 deraadt 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: *
1.56 markus 14: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.35 deraadt 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.
1.22 deraadt 35: */
1.1 deraadt 36:
1.151 deraadt 37: #include <sys/types.h>
1.153 djm 38: #include <sys/time.h>
1.78 provos 39: #include <sys/queue.h>
1.127 stevesk 40: #include <sys/resource.h>
1.128 stevesk 41: #include <sys/types.h>
1.141 stevesk 42: #include <sys/socket.h>
1.128 stevesk 43: #include <sys/un.h>
1.148 stevesk 44: #include <sys/param.h>
1.126 stevesk 45:
1.185 markus 46: #ifdef WITH_OPENSSL
1.146 stevesk 47: #include <openssl/evp.h>
1.185 markus 48: #endif
1.146 stevesk 49:
1.143 stevesk 50: #include <errno.h>
1.142 stevesk 51: #include <fcntl.h>
1.126 stevesk 52: #include <paths.h>
1.129 stevesk 53: #include <signal.h>
1.149 stevesk 54: #include <stdlib.h>
1.150 stevesk 55: #include <stdio.h>
1.146 stevesk 56: #include <string.h>
1.145 stevesk 57: #include <time.h>
1.144 stevesk 58: #include <unistd.h>
1.1 deraadt 59:
1.151 deraadt 60: #include "xmalloc.h"
1.1 deraadt 61: #include "ssh.h"
62: #include "rsa.h"
63: #include "buffer.h"
1.32 markus 64: #include "key.h"
65: #include "authfd.h"
1.37 markus 66: #include "compat.h"
1.47 markus 67: #include "log.h"
1.107 markus 68: #include "misc.h"
1.182 markus 69: #include "digest.h"
1.7 deraadt 70:
1.163 markus 71: #ifdef ENABLE_PKCS11
72: #include "ssh-pkcs11.h"
1.71 jakob 73: #endif
1.59 markus 74:
1.73 stevesk 75: typedef enum {
76: AUTH_UNUSED,
77: AUTH_SOCKET,
78: AUTH_CONNECTION
79: } sock_type;
80:
1.21 markus 81: typedef struct {
82: int fd;
1.73 stevesk 83: sock_type type;
1.21 markus 84: Buffer input;
85: Buffer output;
1.87 markus 86: Buffer request;
1.1 deraadt 87: } SocketEntry;
88:
1.45 markus 89: u_int sockets_alloc = 0;
1.1 deraadt 90: SocketEntry *sockets = NULL;
91:
1.78 provos 92: typedef struct identity {
93: TAILQ_ENTRY(identity) next;
1.33 markus 94: Key *key;
1.21 markus 95: char *comment;
1.163 markus 96: char *provider;
1.174 dtucker 97: time_t death;
1.107 markus 98: u_int confirm;
1.1 deraadt 99: } Identity;
100:
1.33 markus 101: typedef struct {
102: int nentries;
1.78 provos 103: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 104: } Idtab;
105:
106: /* private key table, one per protocol version */
107: Idtab idtable[3];
1.1 deraadt 108:
109: int max_fd = 0;
110:
1.11 markus 111: /* pid of shell == parent of agent */
1.29 deraadt 112: pid_t parent_pid = -1;
1.176 dtucker 113: time_t parent_alive_interval = 0;
1.10 markus 114:
1.187 ! djm 115: /* pid of process for which cleanup_socket is applicable */
! 116: pid_t cleanup_pid = 0;
! 117:
1.10 markus 118: /* pathname and directory for AUTH_SOCKET */
1.132 djm 119: char socket_name[MAXPATHLEN];
120: char socket_dir[MAXPATHLEN];
1.10 markus 121:
1.88 markus 122: /* locking */
123: int locked = 0;
124: char *lock_passwd = NULL;
125:
1.20 markus 126: extern char *__progname;
127:
1.174 dtucker 128: /* Default lifetime in seconds (0 == forever) */
129: static long lifetime = 0;
1.106 marc 130:
1.55 itojun 131: static void
1.101 stevesk 132: close_socket(SocketEntry *e)
133: {
134: close(e->fd);
135: e->fd = -1;
136: e->type = AUTH_UNUSED;
137: buffer_free(&e->input);
138: buffer_free(&e->output);
139: buffer_free(&e->request);
140: }
141:
142: static void
1.33 markus 143: idtab_init(void)
1.1 deraadt 144: {
1.33 markus 145: int i;
1.96 deraadt 146:
1.74 deraadt 147: for (i = 0; i <=2; i++) {
1.78 provos 148: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 149: idtable[i].nentries = 0;
150: }
151: }
152:
153: /* return private key table for requested protocol version */
1.55 itojun 154: static Idtab *
1.33 markus 155: idtab_lookup(int version)
156: {
157: if (version < 1 || version > 2)
158: fatal("internal error, bad protocol version %d", version);
159: return &idtable[version];
160: }
161:
1.89 markus 162: static void
163: free_identity(Identity *id)
164: {
165: key_free(id->key);
1.173 djm 166: free(id->provider);
167: free(id->comment);
168: free(id);
1.89 markus 169: }
170:
1.33 markus 171: /* return matching private key for given public key */
1.78 provos 172: static Identity *
173: lookup_identity(Key *key, int version)
1.33 markus 174: {
1.78 provos 175: Identity *id;
176:
1.33 markus 177: Idtab *tab = idtab_lookup(version);
1.78 provos 178: TAILQ_FOREACH(id, &tab->idlist, next) {
179: if (key_equal(key, id->key))
180: return (id);
1.33 markus 181: }
1.78 provos 182: return (NULL);
183: }
184:
1.107 markus 185: /* Check confirmation of keysign request */
186: static int
187: confirm_key(Identity *id)
188: {
1.122 djm 189: char *p;
1.107 markus 190: int ret = -1;
191:
192: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 193: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
194: id->comment, p))
195: ret = 0;
1.173 djm 196: free(p);
1.122 djm 197:
1.107 markus 198: return (ret);
199: }
200:
1.33 markus 201: /* send list of supported public keys to 'client' */
1.55 itojun 202: static void
1.33 markus 203: process_request_identities(SocketEntry *e, int version)
204: {
205: Idtab *tab = idtab_lookup(version);
1.96 deraadt 206: Identity *id;
1.21 markus 207: Buffer msg;
1.1 deraadt 208:
1.21 markus 209: buffer_init(&msg);
1.33 markus 210: buffer_put_char(&msg, (version == 1) ?
211: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
212: buffer_put_int(&msg, tab->nentries);
1.78 provos 213: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 214: if (id->key->type == KEY_RSA1) {
1.185 markus 215: #ifdef WITH_SSH1
1.33 markus 216: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
217: buffer_put_bignum(&msg, id->key->rsa->e);
218: buffer_put_bignum(&msg, id->key->rsa->n);
1.185 markus 219: #endif
1.33 markus 220: } else {
1.45 markus 221: u_char *blob;
222: u_int blen;
1.39 markus 223: key_to_blob(id->key, &blob, &blen);
1.33 markus 224: buffer_put_string(&msg, blob, blen);
1.173 djm 225: free(blob);
1.33 markus 226: }
227: buffer_put_cstring(&msg, id->comment);
1.21 markus 228: }
229: buffer_put_int(&e->output, buffer_len(&msg));
230: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
231: buffer_free(&msg);
1.1 deraadt 232: }
233:
1.185 markus 234: #ifdef WITH_SSH1
1.33 markus 235: /* ssh1 only */
1.55 itojun 236: static void
1.33 markus 237: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 238: {
1.96 deraadt 239: u_char buf[32], mdbuf[16], session_id[16];
240: u_int response_type;
241: BIGNUM *challenge;
1.78 provos 242: Identity *id;
1.33 markus 243: int i, len;
1.21 markus 244: Buffer msg;
1.182 markus 245: struct ssh_digest_ctx *md;
1.96 deraadt 246: Key *key;
1.21 markus 247:
248: buffer_init(&msg);
1.39 markus 249: key = key_new(KEY_RSA1);
1.76 markus 250: if ((challenge = BN_new()) == NULL)
251: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 252:
1.97 markus 253: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 254: buffer_get_bignum(&e->request, key->rsa->e);
255: buffer_get_bignum(&e->request, key->rsa->n);
256: buffer_get_bignum(&e->request, challenge);
1.21 markus 257:
1.33 markus 258: /* Only protocol 1.1 is supported */
1.87 markus 259: if (buffer_len(&e->request) == 0)
1.33 markus 260: goto failure;
1.87 markus 261: buffer_get(&e->request, session_id, 16);
262: response_type = buffer_get_int(&e->request);
1.33 markus 263: if (response_type != 1)
264: goto failure;
265:
1.78 provos 266: id = lookup_identity(key, 1);
1.107 markus 267: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 268: Key *private = id->key;
1.33 markus 269: /* Decrypt the challenge using the private key. */
1.186 djm 270: if (rsa_private_decrypt(challenge, challenge, private->rsa) != 0)
1.49 markus 271: goto failure;
1.33 markus 272:
273: /* The response is MD5 of decrypted challenge plus session id. */
274: len = BN_num_bytes(challenge);
275: if (len <= 0 || len > 32) {
1.109 itojun 276: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 277: goto failure;
278: }
279: memset(buf, 0, 32);
280: BN_bn2bin(challenge, buf + 32 - len);
1.182 markus 281: if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
282: ssh_digest_update(md, buf, 32) < 0 ||
283: ssh_digest_update(md, session_id, 16) < 0 ||
284: ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
285: fatal("%s: md5 failed", __func__);
286: ssh_digest_free(md);
1.33 markus 287:
288: /* Send the response. */
289: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
290: for (i = 0; i < 16; i++)
291: buffer_put_char(&msg, mdbuf[i]);
292: goto send;
293: }
1.21 markus 294:
1.33 markus 295: failure:
296: /* Unknown identity or protocol error. Send failure. */
1.21 markus 297: buffer_put_char(&msg, SSH_AGENT_FAILURE);
298: send:
299: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 300: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
301: key_free(key);
302: BN_clear_free(challenge);
303: buffer_free(&msg);
304: }
1.185 markus 305: #endif
1.33 markus 306:
307: /* ssh2 only */
1.55 itojun 308: static void
1.33 markus 309: process_sign_request2(SocketEntry *e)
310: {
1.45 markus 311: u_char *blob, *data, *signature = NULL;
312: u_int blen, dlen, slen = 0;
1.96 deraadt 313: extern int datafellows;
1.159 djm 314: int odatafellows;
1.96 deraadt 315: int ok = -1, flags;
1.33 markus 316: Buffer msg;
1.96 deraadt 317: Key *key;
1.33 markus 318:
319: datafellows = 0;
1.43 markus 320:
1.87 markus 321: blob = buffer_get_string(&e->request, &blen);
322: data = buffer_get_string(&e->request, &dlen);
1.37 markus 323:
1.87 markus 324: flags = buffer_get_int(&e->request);
1.159 djm 325: odatafellows = datafellows;
1.37 markus 326: if (flags & SSH_AGENT_OLD_SIGNATURE)
327: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 328:
1.39 markus 329: key = key_from_blob(blob, blen);
1.33 markus 330: if (key != NULL) {
1.78 provos 331: Identity *id = lookup_identity(key, 2);
1.107 markus 332: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 333: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 334: key_free(key);
1.33 markus 335: }
336: buffer_init(&msg);
337: if (ok == 0) {
338: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
339: buffer_put_string(&msg, signature, slen);
340: } else {
341: buffer_put_char(&msg, SSH_AGENT_FAILURE);
342: }
343: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 344: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 345: buffer_len(&msg));
1.21 markus 346: buffer_free(&msg);
1.173 djm 347: free(data);
348: free(blob);
349: free(signature);
1.159 djm 350: datafellows = odatafellows;
1.1 deraadt 351: }
352:
1.33 markus 353: /* shared */
1.55 itojun 354: static void
1.33 markus 355: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 356: {
1.186 djm 357: u_int blen;
1.96 deraadt 358: int success = 0;
1.78 provos 359: Key *key = NULL;
1.45 markus 360: u_char *blob;
1.186 djm 361: #ifdef WITH_SSH1
362: u_int bits;
363: #endif /* WITH_SSH1 */
1.21 markus 364:
1.74 deraadt 365: switch (version) {
1.186 djm 366: #ifdef WITH_SSH1
1.33 markus 367: case 1:
1.39 markus 368: key = key_new(KEY_RSA1);
1.87 markus 369: bits = buffer_get_int(&e->request);
370: buffer_get_bignum(&e->request, key->rsa->e);
371: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 372:
373: if (bits != key_size(key))
1.109 itojun 374: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 375: key_size(key), bits);
1.33 markus 376: break;
1.186 djm 377: #endif /* WITH_SSH1 */
1.33 markus 378: case 2:
1.87 markus 379: blob = buffer_get_string(&e->request, &blen);
1.39 markus 380: key = key_from_blob(blob, blen);
1.173 djm 381: free(blob);
1.33 markus 382: break;
383: }
384: if (key != NULL) {
1.78 provos 385: Identity *id = lookup_identity(key, version);
386: if (id != NULL) {
1.23 markus 387: /*
388: * We have this key. Free the old key. Since we
1.124 djm 389: * don't want to leave empty slots in the middle of
1.40 markus 390: * the array, we actually free the key there and move
391: * all the entries between the empty slot and the end
392: * of the array.
1.23 markus 393: */
1.33 markus 394: Idtab *tab = idtab_lookup(version);
1.38 markus 395: if (tab->nentries < 1)
396: fatal("process_remove_identity: "
397: "internal error: tab->nentries %d",
398: tab->nentries);
1.78 provos 399: TAILQ_REMOVE(&tab->idlist, id, next);
400: free_identity(id);
1.33 markus 401: tab->nentries--;
402: success = 1;
1.21 markus 403: }
1.33 markus 404: key_free(key);
405: }
1.1 deraadt 406: buffer_put_int(&e->output, 1);
1.33 markus 407: buffer_put_char(&e->output,
408: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 409: }
410:
1.55 itojun 411: static void
1.33 markus 412: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 413: {
1.33 markus 414: Idtab *tab = idtab_lookup(version);
1.78 provos 415: Identity *id;
1.21 markus 416:
417: /* Loop over all identities and clear the keys. */
1.78 provos 418: for (id = TAILQ_FIRST(&tab->idlist); id;
419: id = TAILQ_FIRST(&tab->idlist)) {
420: TAILQ_REMOVE(&tab->idlist, id, next);
421: free_identity(id);
1.21 markus 422: }
423:
424: /* Mark that there are no identities. */
1.33 markus 425: tab->nentries = 0;
1.21 markus 426:
427: /* Send success. */
428: buffer_put_int(&e->output, 1);
429: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 430: }
431:
1.155 dtucker 432: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 433: static time_t
1.89 markus 434: reaper(void)
435: {
1.175 dtucker 436: time_t deadline = 0, now = monotime();
1.89 markus 437: Identity *id, *nxt;
438: int version;
1.96 deraadt 439: Idtab *tab;
1.89 markus 440:
441: for (version = 1; version < 3; version++) {
442: tab = idtab_lookup(version);
443: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
444: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 445: if (id->death == 0)
446: continue;
447: if (now >= id->death) {
1.154 dtucker 448: debug("expiring key '%s'", id->comment);
1.89 markus 449: TAILQ_REMOVE(&tab->idlist, id, next);
450: free_identity(id);
451: tab->nentries--;
1.155 dtucker 452: } else
453: deadline = (deadline == 0) ? id->death :
454: MIN(deadline, id->death);
1.89 markus 455: }
456: }
1.155 dtucker 457: if (deadline == 0 || deadline <= now)
458: return 0;
459: else
460: return (deadline - now);
1.89 markus 461: }
462:
463: static void
1.33 markus 464: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 465: {
1.96 deraadt 466: Idtab *tab = idtab_lookup(version);
1.157 canacar 467: Identity *id;
1.174 dtucker 468: int type, success = 0, confirm = 0;
1.178 markus 469: char *comment;
1.174 dtucker 470: time_t death = 0;
1.33 markus 471: Key *k = NULL;
472:
473: switch (version) {
1.186 djm 474: #ifdef WITH_SSH1
1.33 markus 475: case 1:
1.39 markus 476: k = key_new_private(KEY_RSA1);
1.97 markus 477: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 478: buffer_get_bignum(&e->request, k->rsa->n);
479: buffer_get_bignum(&e->request, k->rsa->e);
480: buffer_get_bignum(&e->request, k->rsa->d);
481: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 482:
483: /* SSH and SSL have p and q swapped */
1.87 markus 484: buffer_get_bignum(&e->request, k->rsa->q); /* p */
485: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 486:
487: /* Generate additional parameters */
1.186 djm 488: if (rsa_generate_additional_parameters(k->rsa) != 0)
489: fatal("%s: rsa_generate_additional_parameters "
490: "error", __func__);
1.178 markus 491:
1.180 markus 492: /* enable blinding */
1.178 markus 493: if (RSA_blinding_on(k->rsa, NULL) != 1) {
494: error("process_add_identity: RSA_blinding_on failed");
495: key_free(k);
496: goto send;
497: }
1.33 markus 498: break;
1.186 djm 499: #endif /* WITH_SSH1 */
1.33 markus 500: case 2:
1.178 markus 501: k = key_private_deserialize(&e->request);
502: if (k == NULL) {
1.87 markus 503: buffer_clear(&e->request);
1.33 markus 504: goto send;
1.21 markus 505: }
1.33 markus 506: break;
507: }
1.186 djm 508: if (k == NULL)
509: goto send;
1.87 markus 510: comment = buffer_get_string(&e->request, NULL);
1.186 djm 511:
1.94 markus 512: while (buffer_len(&e->request)) {
1.158 djm 513: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 514: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 515: death = monotime() + buffer_get_int(&e->request);
1.94 markus 516: break;
1.107 markus 517: case SSH_AGENT_CONSTRAIN_CONFIRM:
518: confirm = 1;
519: break;
1.94 markus 520: default:
1.158 djm 521: error("process_add_identity: "
522: "Unknown constraint type %d", type);
1.173 djm 523: free(comment);
1.158 djm 524: key_free(k);
525: goto send;
1.94 markus 526: }
527: }
1.158 djm 528: success = 1;
1.106 marc 529: if (lifetime && !death)
1.175 dtucker 530: death = monotime() + lifetime;
1.157 canacar 531: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 532: id = xcalloc(1, sizeof(Identity));
1.78 provos 533: id->key = k;
534: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 535: /* Increment the number of identities. */
536: tab->nentries++;
537: } else {
538: key_free(k);
1.173 djm 539: free(id->comment);
1.33 markus 540: }
1.157 canacar 541: id->comment = comment;
542: id->death = death;
543: id->confirm = confirm;
1.33 markus 544: send:
1.1 deraadt 545: buffer_put_int(&e->output, 1);
1.33 markus 546: buffer_put_char(&e->output,
547: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 548: }
549:
1.88 markus 550: /* XXX todo: encrypt sensitive data with passphrase */
551: static void
552: process_lock_agent(SocketEntry *e, int lock)
553: {
1.96 deraadt 554: int success = 0;
1.88 markus 555: char *passwd;
556:
557: passwd = buffer_get_string(&e->request, NULL);
558: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
559: locked = 0;
1.183 djm 560: explicit_bzero(lock_passwd, strlen(lock_passwd));
1.173 djm 561: free(lock_passwd);
1.88 markus 562: lock_passwd = NULL;
563: success = 1;
564: } else if (!locked && lock) {
565: locked = 1;
566: lock_passwd = xstrdup(passwd);
567: success = 1;
568: }
1.183 djm 569: explicit_bzero(passwd, strlen(passwd));
1.173 djm 570: free(passwd);
1.95 deraadt 571:
1.88 markus 572: buffer_put_int(&e->output, 1);
573: buffer_put_char(&e->output,
574: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
575: }
576:
577: static void
578: no_identities(SocketEntry *e, u_int type)
579: {
580: Buffer msg;
581:
582: buffer_init(&msg);
583: buffer_put_char(&msg,
584: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
585: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
586: buffer_put_int(&msg, 0);
587: buffer_put_int(&e->output, buffer_len(&msg));
588: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
589: buffer_free(&msg);
590: }
1.59 markus 591:
1.163 markus 592: #ifdef ENABLE_PKCS11
1.59 markus 593: static void
1.158 djm 594: process_add_smartcard_key(SocketEntry *e)
1.59 markus 595: {
1.163 markus 596: char *provider = NULL, *pin;
1.174 dtucker 597: int i, type, version, count = 0, success = 0, confirm = 0;
598: time_t death = 0;
1.163 markus 599: Key **keys = NULL, *k;
1.84 markus 600: Identity *id;
1.59 markus 601: Idtab *tab;
1.75 deraadt 602:
1.163 markus 603: provider = buffer_get_string(&e->request, NULL);
1.87 markus 604: pin = buffer_get_string(&e->request, NULL);
1.110 djm 605:
606: while (buffer_len(&e->request)) {
1.158 djm 607: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 608: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 609: death = monotime() + buffer_get_int(&e->request);
1.110 djm 610: break;
611: case SSH_AGENT_CONSTRAIN_CONFIRM:
612: confirm = 1;
613: break;
614: default:
1.158 djm 615: error("process_add_smartcard_key: "
616: "Unknown constraint type %d", type);
617: goto send;
1.110 djm 618: }
619: }
620: if (lifetime && !death)
1.175 dtucker 621: death = monotime() + lifetime;
1.110 djm 622:
1.163 markus 623: count = pkcs11_add_provider(provider, pin, &keys);
624: for (i = 0; i < count; i++) {
1.84 markus 625: k = keys[i];
626: version = k->type == KEY_RSA1 ? 1 : 2;
627: tab = idtab_lookup(version);
628: if (lookup_identity(k, version) == NULL) {
1.163 markus 629: id = xcalloc(1, sizeof(Identity));
1.84 markus 630: id->key = k;
1.163 markus 631: id->provider = xstrdup(provider);
632: id->comment = xstrdup(provider); /* XXX */
1.110 djm 633: id->death = death;
634: id->confirm = confirm;
1.84 markus 635: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
636: tab->nentries++;
637: success = 1;
638: } else {
639: key_free(k);
640: }
641: keys[i] = NULL;
1.59 markus 642: }
643: send:
1.173 djm 644: free(pin);
645: free(provider);
646: free(keys);
1.59 markus 647: buffer_put_int(&e->output, 1);
648: buffer_put_char(&e->output,
649: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
650: }
651:
652: static void
653: process_remove_smartcard_key(SocketEntry *e)
654: {
1.163 markus 655: char *provider = NULL, *pin = NULL;
656: int version, success = 0;
657: Identity *id, *nxt;
1.84 markus 658: Idtab *tab;
1.59 markus 659:
1.163 markus 660: provider = buffer_get_string(&e->request, NULL);
1.87 markus 661: pin = buffer_get_string(&e->request, NULL);
1.173 djm 662: free(pin);
1.59 markus 663:
1.163 markus 664: for (version = 1; version < 3; version++) {
665: tab = idtab_lookup(version);
666: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
667: nxt = TAILQ_NEXT(id, next);
1.181 djm 668: /* Skip file--based keys */
669: if (id->provider == NULL)
670: continue;
1.163 markus 671: if (!strcmp(provider, id->provider)) {
672: TAILQ_REMOVE(&tab->idlist, id, next);
673: free_identity(id);
674: tab->nentries--;
675: }
1.59 markus 676: }
677: }
1.163 markus 678: if (pkcs11_del_provider(provider) == 0)
679: success = 1;
680: else
681: error("process_remove_smartcard_key:"
682: " pkcs11_del_provider failed");
1.173 djm 683: free(provider);
1.59 markus 684: buffer_put_int(&e->output, 1);
685: buffer_put_char(&e->output,
686: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
687: }
1.163 markus 688: #endif /* ENABLE_PKCS11 */
1.59 markus 689:
1.33 markus 690: /* dispatch incoming messages */
691:
1.55 itojun 692: static void
1.2 provos 693: process_message(SocketEntry *e)
1.1 deraadt 694: {
1.96 deraadt 695: u_int msg_len, type;
1.45 markus 696: u_char *cp;
1.89 markus 697:
1.21 markus 698: if (buffer_len(&e->input) < 5)
699: return; /* Incomplete message. */
1.77 stevesk 700: cp = buffer_ptr(&e->input);
1.137 djm 701: msg_len = get_u32(cp);
1.21 markus 702: if (msg_len > 256 * 1024) {
1.101 stevesk 703: close_socket(e);
1.21 markus 704: return;
705: }
706: if (buffer_len(&e->input) < msg_len + 4)
707: return;
1.87 markus 708:
709: /* move the current input to e->request */
1.21 markus 710: buffer_consume(&e->input, 4);
1.87 markus 711: buffer_clear(&e->request);
712: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
713: buffer_consume(&e->input, msg_len);
714: type = buffer_get_char(&e->request);
1.21 markus 715:
1.88 markus 716: /* check wheter agent is locked */
717: if (locked && type != SSH_AGENTC_UNLOCK) {
718: buffer_clear(&e->request);
719: switch (type) {
720: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
721: case SSH2_AGENTC_REQUEST_IDENTITIES:
722: /* send empty lists */
723: no_identities(e, type);
724: break;
725: default:
726: /* send a fail message for all other request types */
727: buffer_put_int(&e->output, 1);
728: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
729: }
730: return;
731: }
732:
1.59 markus 733: debug("type %d", type);
1.21 markus 734: switch (type) {
1.88 markus 735: case SSH_AGENTC_LOCK:
736: case SSH_AGENTC_UNLOCK:
737: process_lock_agent(e, type == SSH_AGENTC_LOCK);
738: break;
1.185 markus 739: #ifdef WITH_SSH1
1.33 markus 740: /* ssh1 */
741: case SSH_AGENTC_RSA_CHALLENGE:
742: process_authentication_challenge1(e);
743: break;
1.21 markus 744: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 745: process_request_identities(e, 1);
1.21 markus 746: break;
747: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 748: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 749: process_add_identity(e, 1);
1.21 markus 750: break;
751: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 752: process_remove_identity(e, 1);
1.21 markus 753: break;
754: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 755: process_remove_all_identities(e, 1);
756: break;
1.185 markus 757: #endif
1.33 markus 758: /* ssh2 */
759: case SSH2_AGENTC_SIGN_REQUEST:
760: process_sign_request2(e);
761: break;
762: case SSH2_AGENTC_REQUEST_IDENTITIES:
763: process_request_identities(e, 2);
764: break;
765: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 766: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 767: process_add_identity(e, 2);
768: break;
769: case SSH2_AGENTC_REMOVE_IDENTITY:
770: process_remove_identity(e, 2);
771: break;
772: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
773: process_remove_all_identities(e, 2);
1.21 markus 774: break;
1.163 markus 775: #ifdef ENABLE_PKCS11
1.59 markus 776: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 777: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 778: process_add_smartcard_key(e);
1.75 deraadt 779: break;
1.59 markus 780: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
781: process_remove_smartcard_key(e);
1.75 deraadt 782: break;
1.163 markus 783: #endif /* ENABLE_PKCS11 */
1.21 markus 784: default:
785: /* Unknown message. Respond with failure. */
786: error("Unknown message %d", type);
1.87 markus 787: buffer_clear(&e->request);
1.21 markus 788: buffer_put_int(&e->output, 1);
789: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
790: break;
791: }
1.1 deraadt 792: }
793:
1.55 itojun 794: static void
1.73 stevesk 795: new_socket(sock_type type, int fd)
1.1 deraadt 796: {
1.112 markus 797: u_int i, old_alloc, new_alloc;
1.96 deraadt 798:
1.119 djm 799: set_nonblock(fd);
1.21 markus 800:
801: if (fd > max_fd)
802: max_fd = fd;
803:
804: for (i = 0; i < sockets_alloc; i++)
805: if (sockets[i].type == AUTH_UNUSED) {
806: sockets[i].fd = fd;
807: buffer_init(&sockets[i].input);
808: buffer_init(&sockets[i].output);
1.87 markus 809: buffer_init(&sockets[i].request);
1.112 markus 810: sockets[i].type = type;
1.21 markus 811: return;
812: }
813: old_alloc = sockets_alloc;
1.112 markus 814: new_alloc = sockets_alloc + 10;
1.133 djm 815: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 816: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 817: sockets[i].type = AUTH_UNUSED;
1.112 markus 818: sockets_alloc = new_alloc;
1.21 markus 819: sockets[old_alloc].fd = fd;
820: buffer_init(&sockets[old_alloc].input);
821: buffer_init(&sockets[old_alloc].output);
1.87 markus 822: buffer_init(&sockets[old_alloc].request);
1.112 markus 823: sockets[old_alloc].type = type;
1.1 deraadt 824: }
825:
1.55 itojun 826: static int
1.155 dtucker 827: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
828: struct timeval **tvpp)
1.1 deraadt 829: {
1.174 dtucker 830: u_int i, sz;
1.46 markus 831: int n = 0;
1.155 dtucker 832: static struct timeval tv;
1.174 dtucker 833: time_t deadline;
1.46 markus 834:
835: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 836: switch (sockets[i].type) {
837: case AUTH_SOCKET:
838: case AUTH_CONNECTION:
1.46 markus 839: n = MAX(n, sockets[i].fd);
1.21 markus 840: break;
841: case AUTH_UNUSED:
842: break;
843: default:
844: fatal("Unknown socket type %d", sockets[i].type);
845: break;
846: }
1.46 markus 847: }
848:
849: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 850: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 851: free(*fdrp);
852: free(*fdwp);
1.46 markus 853: *fdrp = xmalloc(sz);
854: *fdwp = xmalloc(sz);
1.66 markus 855: *nallocp = sz;
1.46 markus 856: }
1.66 markus 857: if (n < *fdl)
858: debug("XXX shrink: %d < %d", n, *fdl);
859: *fdl = n;
1.46 markus 860: memset(*fdrp, 0, sz);
861: memset(*fdwp, 0, sz);
862:
863: for (i = 0; i < sockets_alloc; i++) {
864: switch (sockets[i].type) {
865: case AUTH_SOCKET:
866: case AUTH_CONNECTION:
867: FD_SET(sockets[i].fd, *fdrp);
868: if (buffer_len(&sockets[i].output) > 0)
869: FD_SET(sockets[i].fd, *fdwp);
870: break;
871: default:
872: break;
873: }
874: }
1.155 dtucker 875: deadline = reaper();
876: if (parent_alive_interval != 0)
877: deadline = (deadline == 0) ? parent_alive_interval :
878: MIN(deadline, parent_alive_interval);
879: if (deadline == 0) {
880: *tvpp = NULL;
881: } else {
882: tv.tv_sec = deadline;
883: tv.tv_usec = 0;
884: *tvpp = &tv;
885: }
1.46 markus 886: return (1);
1.21 markus 887: }
888:
1.55 itojun 889: static void
1.21 markus 890: after_select(fd_set *readset, fd_set *writeset)
891: {
1.96 deraadt 892: struct sockaddr_un sunaddr;
1.26 markus 893: socklen_t slen;
1.21 markus 894: char buf[1024];
1.96 deraadt 895: int len, sock;
1.162 djm 896: u_int i, orig_alloc;
1.103 markus 897: uid_t euid;
898: gid_t egid;
1.21 markus 899:
1.162 djm 900: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 901: switch (sockets[i].type) {
902: case AUTH_UNUSED:
903: break;
904: case AUTH_SOCKET:
905: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 906: slen = sizeof(sunaddr);
1.46 markus 907: sock = accept(sockets[i].fd,
1.131 deraadt 908: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 909: if (sock < 0) {
1.81 stevesk 910: error("accept from AUTH_SOCKET: %s",
911: strerror(errno));
1.103 markus 912: break;
913: }
914: if (getpeereid(sock, &euid, &egid) < 0) {
915: error("getpeereid %d failed: %s",
916: sock, strerror(errno));
917: close(sock);
918: break;
919: }
1.105 markus 920: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 921: error("uid mismatch: "
1.104 stevesk 922: "peer euid %u != uid %u",
923: (u_int) euid, (u_int) getuid());
1.103 markus 924: close(sock);
1.21 markus 925: break;
926: }
927: new_socket(AUTH_CONNECTION, sock);
928: }
929: break;
930: case AUTH_CONNECTION:
931: if (buffer_len(&sockets[i].output) > 0 &&
932: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 933: len = write(sockets[i].fd,
934: buffer_ptr(&sockets[i].output),
935: buffer_len(&sockets[i].output));
936: if (len == -1 && (errno == EAGAIN ||
937: errno == EINTR))
938: continue;
1.21 markus 939: if (len <= 0) {
1.101 stevesk 940: close_socket(&sockets[i]);
1.21 markus 941: break;
942: }
943: buffer_consume(&sockets[i].output, len);
944: }
945: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 946: len = read(sockets[i].fd, buf, sizeof(buf));
947: if (len == -1 && (errno == EAGAIN ||
948: errno == EINTR))
949: continue;
1.21 markus 950: if (len <= 0) {
1.101 stevesk 951: close_socket(&sockets[i]);
1.21 markus 952: break;
953: }
954: buffer_append(&sockets[i].input, buf, len);
955: process_message(&sockets[i]);
956: }
957: break;
958: default:
959: fatal("Unknown type %d", sockets[i].type);
960: }
1.1 deraadt 961: }
962:
1.55 itojun 963: static void
1.113 markus 964: cleanup_socket(void)
1.15 markus 965: {
1.187 ! djm 966: if (cleanup_pid != 0 && getpid() != cleanup_pid)
! 967: return;
! 968: debug("%s: cleanup", __func__);
1.48 deraadt 969: if (socket_name[0])
970: unlink(socket_name);
971: if (socket_dir[0])
972: rmdir(socket_dir);
1.10 markus 973: }
974:
1.114 markus 975: void
1.15 markus 976: cleanup_exit(int i)
977: {
1.113 markus 978: cleanup_socket();
979: _exit(i);
1.15 markus 980: }
981:
1.135 deraadt 982: /*ARGSUSED*/
1.55 itojun 983: static void
1.48 deraadt 984: cleanup_handler(int sig)
985: {
1.113 markus 986: cleanup_socket();
1.163 markus 987: #ifdef ENABLE_PKCS11
988: pkcs11_terminate();
989: #endif
1.48 deraadt 990: _exit(2);
1.113 markus 991: }
992:
1.68 markus 993: static void
1.155 dtucker 994: check_parent_exists(void)
1.68 markus 995: {
1.172 dtucker 996: /*
997: * If our parent has exited then getppid() will return (pid_t)1,
998: * so testing for that should be safe.
999: */
1000: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1001: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1002: cleanup_socket();
1003: _exit(2);
1.68 markus 1004: }
1.48 deraadt 1005: }
1006:
1.55 itojun 1007: static void
1.50 itojun 1008: usage(void)
1.15 markus 1009: {
1.184 deraadt 1010: fprintf(stderr,
1011: "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-t life]\n"
1012: " [command [arg ...]]\n"
1013: " ssh-agent [-c | -s] -k\n");
1.21 markus 1014: exit(1);
1.15 markus 1015: }
1016:
1.2 provos 1017: int
1018: main(int ac, char **av)
1.1 deraadt 1019: {
1.107 markus 1020: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1021: int sock, fd, ch, result, saved_errno;
1.120 avsm 1022: u_int nalloc;
1.96 deraadt 1023: char *shell, *format, *pidstr, *agentsocket = NULL;
1024: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1025: struct sockaddr_un sunaddr;
1.41 markus 1026: struct rlimit rlim;
1.96 deraadt 1027: extern int optind;
1.98 stevesk 1028: extern char *optarg;
1.21 markus 1029: pid_t pid;
1.96 deraadt 1030: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1031: struct timeval *tvp = NULL;
1.161 tobias 1032: size_t len;
1.123 djm 1033:
1034: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1035: sanitise_stdfd();
1.99 markus 1036:
1037: /* drop */
1038: setegid(getgid());
1039: setgid(getgid());
1.53 markus 1040:
1.185 markus 1041: #ifdef WITH_OPENSSL
1.170 djm 1042: OpenSSL_add_all_algorithms();
1.185 markus 1043: #endif
1.21 markus 1044:
1.106 marc 1045: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1046: switch (ch) {
1047: case 'c':
1048: if (s_flag)
1049: usage();
1050: c_flag++;
1051: break;
1052: case 'k':
1053: k_flag++;
1054: break;
1055: case 's':
1056: if (c_flag)
1057: usage();
1058: s_flag++;
1059: break;
1.57 markus 1060: case 'd':
1061: if (d_flag)
1062: usage();
1063: d_flag++;
1064: break;
1.86 markus 1065: case 'a':
1066: agentsocket = optarg;
1.106 marc 1067: break;
1068: case 't':
1069: if ((lifetime = convtime(optarg)) == -1) {
1070: fprintf(stderr, "Invalid lifetime\n");
1071: usage();
1072: }
1.86 markus 1073: break;
1.21 markus 1074: default:
1075: usage();
1076: }
1077: }
1078: ac -= optind;
1079: av += optind;
1080:
1.57 markus 1081: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1082: usage();
1083:
1.85 markus 1084: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1085: shell = getenv("SHELL");
1.161 tobias 1086: if (shell != NULL && (len = strlen(shell)) > 2 &&
1087: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1088: c_flag = 1;
1089: }
1090: if (k_flag) {
1.136 deraadt 1091: const char *errstr = NULL;
1092:
1.21 markus 1093: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1094: if (pidstr == NULL) {
1095: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1096: SSH_AGENTPID_ENV_NAME);
1.21 markus 1097: exit(1);
1098: }
1.136 deraadt 1099: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1100: if (errstr) {
1101: fprintf(stderr,
1102: "%s=\"%s\", which is not a good PID: %s\n",
1103: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1104: exit(1);
1105: }
1106: if (kill(pid, SIGTERM) == -1) {
1107: perror("kill");
1108: exit(1);
1109: }
1110: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1111: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1112: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1113: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1114: exit(0);
1115: }
1116: parent_pid = getpid();
1117:
1.86 markus 1118: if (agentsocket == NULL) {
1119: /* Create private directory for agent socket */
1.171 djm 1120: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1121: if (mkdtemp(socket_dir) == NULL) {
1122: perror("mkdtemp: private socket dir");
1123: exit(1);
1124: }
1.91 mpech 1125: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1126: (long)parent_pid);
1.86 markus 1127: } else {
1128: /* Try to use specified agent socket */
1129: socket_dir[0] = '\0';
1130: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1131: }
1132:
1.23 markus 1133: /*
1134: * Create socket early so it will exist before command gets run from
1135: * the parent.
1136: */
1.21 markus 1137: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1138: if (sock < 0) {
1139: perror("socket");
1.121 djm 1140: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1141: cleanup_exit(1);
1142: }
1143: memset(&sunaddr, 0, sizeof(sunaddr));
1144: sunaddr.sun_family = AF_UNIX;
1145: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1146: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1147: perror("bind");
1.121 djm 1148: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1149: cleanup_exit(1);
1150: }
1.117 markus 1151: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1152: perror("listen");
1153: cleanup_exit(1);
1154: }
1.46 markus 1155:
1.23 markus 1156: /*
1157: * Fork, and have the parent execute the command, if any, or present
1158: * the socket data. The child continues as the authentication agent.
1159: */
1.57 markus 1160: if (d_flag) {
1161: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1162: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1163: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1164: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1165: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1166: goto skip;
1167: }
1.21 markus 1168: pid = fork();
1169: if (pid == -1) {
1170: perror("fork");
1.81 stevesk 1171: cleanup_exit(1);
1.21 markus 1172: }
1173: if (pid != 0) { /* Parent - execute the given command. */
1174: close(sock);
1.91 mpech 1175: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1176: if (ac == 0) {
1177: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1178: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1179: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1180: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1181: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1182: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1183: exit(0);
1184: }
1.36 deraadt 1185: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1186: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1187: perror("setenv");
1188: exit(1);
1189: }
1.21 markus 1190: execvp(av[0], av);
1191: perror(av[0]);
1192: exit(1);
1193: }
1.81 stevesk 1194: /* child */
1195: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1196:
1197: if (setsid() == -1) {
1.81 stevesk 1198: error("setsid: %s", strerror(errno));
1.67 stevesk 1199: cleanup_exit(1);
1200: }
1201:
1202: (void)chdir("/");
1.107 markus 1203: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1204: /* XXX might close listen socket */
1205: (void)dup2(fd, STDIN_FILENO);
1206: (void)dup2(fd, STDOUT_FILENO);
1207: (void)dup2(fd, STDERR_FILENO);
1208: if (fd > 2)
1209: close(fd);
1210: }
1.21 markus 1211:
1.41 markus 1212: /* deny core dumps, since memory contains unencrypted private keys */
1213: rlim.rlim_cur = rlim.rlim_max = 0;
1214: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1215: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1216: cleanup_exit(1);
1217: }
1.57 markus 1218:
1219: skip:
1.187 ! djm 1220:
! 1221: cleanup_pid = getpid();
1.163 markus 1222:
1223: #ifdef ENABLE_PKCS11
1224: pkcs11_init(0);
1225: #endif
1.21 markus 1226: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1227: if (ac > 0)
1228: parent_alive_interval = 10;
1.33 markus 1229: idtab_init();
1.61 markus 1230: signal(SIGPIPE, SIG_IGN);
1.177 djm 1231: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1232: signal(SIGHUP, cleanup_handler);
1233: signal(SIGTERM, cleanup_handler);
1.66 markus 1234: nalloc = 0;
1235:
1.21 markus 1236: while (1) {
1.155 dtucker 1237: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1238: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1239: saved_errno = errno;
1.155 dtucker 1240: if (parent_alive_interval != 0)
1241: check_parent_exists();
1242: (void) reaper(); /* remove expired keys */
1.154 dtucker 1243: if (result < 0) {
1244: if (saved_errno == EINTR)
1.21 markus 1245: continue;
1.154 dtucker 1246: fatal("select: %s", strerror(saved_errno));
1247: } else if (result > 0)
1248: after_select(readsetp, writesetp);
1.15 markus 1249: }
1.21 markus 1250: /* NOTREACHED */
1.1 deraadt 1251: }
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