Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.221
1.221 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.220 2017/04/30 23:18:44 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>
1.141 stevesk 41: #include <sys/socket.h>
1.189 djm 42: #include <sys/stat.h>
1.128 stevesk 43: #include <sys/un.h>
1.126 stevesk 44:
1.185 markus 45: #ifdef WITH_OPENSSL
1.146 stevesk 46: #include <openssl/evp.h>
1.185 markus 47: #endif
1.146 stevesk 48:
1.143 stevesk 49: #include <errno.h>
1.142 stevesk 50: #include <fcntl.h>
1.126 stevesk 51: #include <paths.h>
1.129 stevesk 52: #include <signal.h>
1.149 stevesk 53: #include <stdlib.h>
1.150 stevesk 54: #include <stdio.h>
1.146 stevesk 55: #include <string.h>
1.196 deraadt 56: #include <limits.h>
1.145 stevesk 57: #include <time.h>
1.144 stevesk 58: #include <unistd.h>
1.203 dtucker 59: #include <util.h>
1.194 markus 60:
1.151 deraadt 61: #include "xmalloc.h"
1.1 deraadt 62: #include "ssh.h"
63: #include "rsa.h"
1.194 markus 64: #include "sshbuf.h"
65: #include "sshkey.h"
1.32 markus 66: #include "authfd.h"
1.37 markus 67: #include "compat.h"
1.47 markus 68: #include "log.h"
1.107 markus 69: #include "misc.h"
1.182 markus 70: #include "digest.h"
1.194 markus 71: #include "ssherr.h"
1.215 djm 72: #include "match.h"
1.7 deraadt 73:
1.163 markus 74: #ifdef ENABLE_PKCS11
75: #include "ssh-pkcs11.h"
1.71 jakob 76: #endif
1.59 markus 77:
1.215 djm 78: #ifndef DEFAULT_PKCS11_WHITELIST
1.216 djm 79: # define DEFAULT_PKCS11_WHITELIST "/usr/lib*/*,/usr/local/lib*/*"
1.215 djm 80: #endif
81:
1.73 stevesk 82: typedef enum {
83: AUTH_UNUSED,
84: AUTH_SOCKET,
85: AUTH_CONNECTION
86: } sock_type;
87:
1.21 markus 88: typedef struct {
89: int fd;
1.73 stevesk 90: sock_type type;
1.194 markus 91: struct sshbuf *input;
92: struct sshbuf *output;
93: struct sshbuf *request;
1.1 deraadt 94: } SocketEntry;
95:
1.45 markus 96: u_int sockets_alloc = 0;
1.1 deraadt 97: SocketEntry *sockets = NULL;
98:
1.78 provos 99: typedef struct identity {
100: TAILQ_ENTRY(identity) next;
1.194 markus 101: struct sshkey *key;
1.21 markus 102: char *comment;
1.163 markus 103: char *provider;
1.174 dtucker 104: time_t death;
1.107 markus 105: u_int confirm;
1.1 deraadt 106: } Identity;
107:
1.221 ! djm 108: struct idtable {
1.33 markus 109: int nentries;
1.78 provos 110: TAILQ_HEAD(idqueue, identity) idlist;
1.221 ! djm 111: };
1.33 markus 112:
1.221 ! djm 113: /* private key table */
! 114: struct idtable *idtab;
1.1 deraadt 115:
116: int max_fd = 0;
117:
1.11 markus 118: /* pid of shell == parent of agent */
1.29 deraadt 119: pid_t parent_pid = -1;
1.176 dtucker 120: time_t parent_alive_interval = 0;
1.10 markus 121:
1.187 djm 122: /* pid of process for which cleanup_socket is applicable */
123: pid_t cleanup_pid = 0;
124:
1.10 markus 125: /* pathname and directory for AUTH_SOCKET */
1.196 deraadt 126: char socket_name[PATH_MAX];
127: char socket_dir[PATH_MAX];
1.10 markus 128:
1.215 djm 129: /* PKCS#11 path whitelist */
130: static char *pkcs11_whitelist;
131:
1.88 markus 132: /* locking */
1.203 dtucker 133: #define LOCK_SIZE 32
134: #define LOCK_SALT_SIZE 16
135: #define LOCK_ROUNDS 1
1.88 markus 136: int locked = 0;
1.213 djm 137: u_char lock_pwhash[LOCK_SIZE];
138: u_char lock_salt[LOCK_SALT_SIZE];
1.88 markus 139:
1.20 markus 140: extern char *__progname;
141:
1.174 dtucker 142: /* Default lifetime in seconds (0 == forever) */
143: static long lifetime = 0;
1.106 marc 144:
1.192 djm 145: static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
146:
1.55 itojun 147: static void
1.101 stevesk 148: close_socket(SocketEntry *e)
149: {
150: close(e->fd);
151: e->fd = -1;
152: e->type = AUTH_UNUSED;
1.194 markus 153: sshbuf_free(e->input);
154: sshbuf_free(e->output);
155: sshbuf_free(e->request);
1.101 stevesk 156: }
157:
158: static void
1.33 markus 159: idtab_init(void)
1.1 deraadt 160: {
1.221 ! djm 161: idtab = xcalloc(1, sizeof(*idtab));
! 162: TAILQ_INIT(&idtab->idlist);
! 163: idtab->nentries = 0;
1.33 markus 164: }
165:
1.89 markus 166: static void
167: free_identity(Identity *id)
168: {
1.194 markus 169: sshkey_free(id->key);
1.173 djm 170: free(id->provider);
171: free(id->comment);
172: free(id);
1.89 markus 173: }
174:
1.33 markus 175: /* return matching private key for given public key */
1.78 provos 176: static Identity *
1.221 ! djm 177: lookup_identity(struct sshkey *key)
1.33 markus 178: {
1.78 provos 179: Identity *id;
180:
1.221 ! djm 181: TAILQ_FOREACH(id, &idtab->idlist, next) {
1.194 markus 182: if (sshkey_equal(key, id->key))
1.78 provos 183: return (id);
1.33 markus 184: }
1.78 provos 185: return (NULL);
186: }
187:
1.107 markus 188: /* Check confirmation of keysign request */
189: static int
190: confirm_key(Identity *id)
191: {
1.122 djm 192: char *p;
1.107 markus 193: int ret = -1;
194:
1.194 markus 195: p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT);
1.197 djm 196: if (p != NULL &&
197: ask_permission("Allow use of key %s?\nKey fingerprint %s.",
1.122 djm 198: id->comment, p))
199: ret = 0;
1.173 djm 200: free(p);
1.122 djm 201:
1.107 markus 202: return (ret);
203: }
204:
1.194 markus 205: static void
206: send_status(SocketEntry *e, int success)
207: {
208: int r;
209:
210: if ((r = sshbuf_put_u32(e->output, 1)) != 0 ||
211: (r = sshbuf_put_u8(e->output, success ?
212: SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0)
213: fatal("%s: buffer error: %s", __func__, ssh_err(r));
214: }
215:
1.33 markus 216: /* send list of supported public keys to 'client' */
1.55 itojun 217: static void
1.221 ! djm 218: process_request_identities(SocketEntry *e)
1.33 markus 219: {
1.96 deraadt 220: Identity *id;
1.194 markus 221: struct sshbuf *msg;
222: int r;
1.1 deraadt 223:
1.194 markus 224: if ((msg = sshbuf_new()) == NULL)
225: fatal("%s: sshbuf_new failed", __func__);
1.221 ! djm 226: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
! 227: (r = sshbuf_put_u32(msg, idtab->nentries)) != 0)
! 228: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 229: TAILQ_FOREACH(id, &idtab->idlist, next) {
! 230: if ((r = sshkey_puts(id->key, msg)) != 0 ||
! 231: (r = sshbuf_put_cstring(msg, id->comment)) != 0) {
! 232: error("%s: put key/comment: %s", __func__,
1.220 djm 233: ssh_err(r));
234: continue;
1.33 markus 235: }
1.21 markus 236: }
1.194 markus 237: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
238: fatal("%s: buffer error: %s", __func__, ssh_err(r));
239: sshbuf_free(msg);
1.1 deraadt 240: }
241:
1.33 markus 242:
1.208 markus 243: static char *
244: agent_decode_alg(struct sshkey *key, u_int flags)
245: {
246: if (key->type == KEY_RSA) {
247: if (flags & SSH_AGENT_RSA_SHA2_256)
248: return "rsa-sha2-256";
249: else if (flags & SSH_AGENT_RSA_SHA2_512)
250: return "rsa-sha2-512";
251: }
252: return NULL;
253: }
254:
1.33 markus 255: /* ssh2 only */
1.55 itojun 256: static void
1.33 markus 257: process_sign_request2(SocketEntry *e)
258: {
1.221 ! djm 259: const u_char *data;
! 260: u_char *signature = NULL;
! 261: size_t dlen, slen = 0;
1.194 markus 262: u_int compat = 0, flags;
263: int r, ok = -1;
264: struct sshbuf *msg;
1.221 ! djm 265: struct sshkey *key = NULL;
1.195 djm 266: struct identity *id;
1.194 markus 267:
1.195 djm 268: if ((msg = sshbuf_new()) == NULL)
269: fatal("%s: sshbuf_new failed", __func__);
1.221 ! djm 270: if ((r = sshkey_froms(e->request, &key)) != 0 ||
! 271: (r = sshbuf_get_string_direct(e->request, &data, &dlen)) != 0 ||
1.194 markus 272: (r = sshbuf_get_u32(e->request, &flags)) != 0)
273: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.37 markus 274: if (flags & SSH_AGENT_OLD_SIGNATURE)
1.194 markus 275: compat = SSH_BUG_SIGBLOB;
1.221 ! djm 276: if ((id = lookup_identity(key)) == NULL) {
1.195 djm 277: verbose("%s: %s key not found", __func__, sshkey_type(key));
278: goto send;
279: }
280: if (id->confirm && confirm_key(id) != 0) {
281: verbose("%s: user refused key", __func__);
282: goto send;
283: }
284: if ((r = sshkey_sign(id->key, &signature, &slen,
1.208 markus 285: data, dlen, agent_decode_alg(key, flags), compat)) != 0) {
1.209 djm 286: error("%s: sshkey_sign: %s", __func__, ssh_err(r));
1.195 djm 287: goto send;
1.33 markus 288: }
1.195 djm 289: /* Success */
290: ok = 0;
291: send:
292: sshkey_free(key);
1.33 markus 293: if (ok == 0) {
1.194 markus 294: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
295: (r = sshbuf_put_string(msg, signature, slen)) != 0)
296: fatal("%s: buffer error: %s", __func__, ssh_err(r));
297: } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
298: fatal("%s: buffer error: %s", __func__, ssh_err(r));
299:
300: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
301: fatal("%s: buffer error: %s", __func__, ssh_err(r));
302:
303: sshbuf_free(msg);
1.173 djm 304: free(signature);
1.1 deraadt 305: }
306:
1.33 markus 307: /* shared */
1.55 itojun 308: static void
1.221 ! djm 309: process_remove_identity(SocketEntry *e)
1.1 deraadt 310: {
1.194 markus 311: int r, success = 0;
312: struct sshkey *key = NULL;
1.221 ! djm 313: Identity *id;
1.21 markus 314:
1.221 ! djm 315: if ((r = sshkey_froms(e->request, &key)) != 0) {
! 316: error("%s: get key: %s", __func__, ssh_err(r));
! 317: goto done;
! 318: }
! 319: if ((id = lookup_identity(key)) == NULL) {
! 320: debug("%s: key not found", __func__);
! 321: goto done;
! 322: }
! 323: /* We have this key, free it. */
! 324: if (idtab->nentries < 1)
! 325: fatal("%s: internal error: nentries %d",
! 326: __func__, idtab->nentries);
! 327: TAILQ_REMOVE(&idtab->idlist, id, next);
! 328: free_identity(id);
! 329: idtab->nentries--;
! 330: sshkey_free(key);
! 331: success = 1;
! 332: done:
1.194 markus 333: send_status(e, success);
1.1 deraadt 334: }
335:
1.55 itojun 336: static void
1.221 ! djm 337: process_remove_all_identities(SocketEntry *e)
1.1 deraadt 338: {
1.78 provos 339: Identity *id;
1.21 markus 340:
341: /* Loop over all identities and clear the keys. */
1.221 ! djm 342: for (id = TAILQ_FIRST(&idtab->idlist); id;
! 343: id = TAILQ_FIRST(&idtab->idlist)) {
! 344: TAILQ_REMOVE(&idtab->idlist, id, next);
1.78 provos 345: free_identity(id);
1.21 markus 346: }
347:
348: /* Mark that there are no identities. */
1.221 ! djm 349: idtab->nentries = 0;
1.21 markus 350:
351: /* Send success. */
1.194 markus 352: send_status(e, 1);
1.1 deraadt 353: }
354:
1.155 dtucker 355: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 356: static time_t
1.89 markus 357: reaper(void)
358: {
1.175 dtucker 359: time_t deadline = 0, now = monotime();
1.89 markus 360: Identity *id, *nxt;
361:
1.221 ! djm 362: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
! 363: nxt = TAILQ_NEXT(id, next);
! 364: if (id->death == 0)
! 365: continue;
! 366: if (now >= id->death) {
! 367: debug("expiring key '%s'", id->comment);
! 368: TAILQ_REMOVE(&idtab->idlist, id, next);
! 369: free_identity(id);
! 370: idtab->nentries--;
! 371: } else
! 372: deadline = (deadline == 0) ? id->death :
! 373: MINIMUM(deadline, id->death);
1.89 markus 374: }
1.155 dtucker 375: if (deadline == 0 || deadline <= now)
376: return 0;
377: else
378: return (deadline - now);
1.89 markus 379: }
380:
381: static void
1.221 ! djm 382: process_add_identity(SocketEntry *e)
1.1 deraadt 383: {
1.157 canacar 384: Identity *id;
1.194 markus 385: int success = 0, confirm = 0;
386: u_int seconds;
387: char *comment = NULL;
1.174 dtucker 388: time_t death = 0;
1.194 markus 389: struct sshkey *k = NULL;
390: u_char ctype;
391: int r = SSH_ERR_INTERNAL_ERROR;
1.33 markus 392:
1.221 ! djm 393: if ((r = sshkey_private_deserialize(e->request, &k)) != 0 ||
! 394: k == NULL ||
1.194 markus 395: (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
396: error("%s: decode private key: %s", __func__, ssh_err(r));
397: goto err;
398: }
1.186 djm 399:
1.194 markus 400: while (sshbuf_len(e->request)) {
401: if ((r = sshbuf_get_u8(e->request, &ctype)) != 0) {
402: error("%s: buffer error: %s", __func__, ssh_err(r));
403: goto err;
404: }
405: switch (ctype) {
1.94 markus 406: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.194 markus 407: if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) {
408: error("%s: bad lifetime constraint: %s",
409: __func__, ssh_err(r));
410: goto err;
411: }
412: death = monotime() + seconds;
1.94 markus 413: break;
1.107 markus 414: case SSH_AGENT_CONSTRAIN_CONFIRM:
415: confirm = 1;
416: break;
1.94 markus 417: default:
1.194 markus 418: error("%s: Unknown constraint %d", __func__, ctype);
419: err:
420: sshbuf_reset(e->request);
1.173 djm 421: free(comment);
1.194 markus 422: sshkey_free(k);
1.158 djm 423: goto send;
1.94 markus 424: }
425: }
1.194 markus 426:
1.158 djm 427: success = 1;
1.106 marc 428: if (lifetime && !death)
1.175 dtucker 429: death = monotime() + lifetime;
1.221 ! djm 430: if ((id = lookup_identity(k)) == NULL) {
1.163 markus 431: id = xcalloc(1, sizeof(Identity));
1.78 provos 432: id->key = k;
1.221 ! djm 433: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1.33 markus 434: /* Increment the number of identities. */
1.221 ! djm 435: idtab->nentries++;
1.33 markus 436: } else {
1.194 markus 437: sshkey_free(k);
1.173 djm 438: free(id->comment);
1.33 markus 439: }
1.157 canacar 440: id->comment = comment;
441: id->death = death;
442: id->confirm = confirm;
1.33 markus 443: send:
1.194 markus 444: send_status(e, success);
1.1 deraadt 445: }
446:
1.88 markus 447: /* XXX todo: encrypt sensitive data with passphrase */
448: static void
449: process_lock_agent(SocketEntry *e, int lock)
450: {
1.203 dtucker 451: int r, success = 0, delay;
1.213 djm 452: char *passwd;
453: u_char passwdhash[LOCK_SIZE];
1.203 dtucker 454: static u_int fail_count = 0;
455: size_t pwlen;
456:
457: if ((r = sshbuf_get_cstring(e->request, &passwd, &pwlen)) != 0)
458: fatal("%s: buffer error: %s", __func__, ssh_err(r));
459: if (pwlen == 0) {
460: debug("empty password not supported");
461: } else if (locked && !lock) {
462: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
463: passwdhash, sizeof(passwdhash), LOCK_ROUNDS) < 0)
464: fatal("bcrypt_pbkdf");
1.213 djm 465: if (timingsafe_bcmp(passwdhash, lock_pwhash, LOCK_SIZE) == 0) {
1.203 dtucker 466: debug("agent unlocked");
467: locked = 0;
468: fail_count = 0;
1.213 djm 469: explicit_bzero(lock_pwhash, sizeof(lock_pwhash));
1.203 dtucker 470: success = 1;
471: } else {
472: /* delay in 0.1s increments up to 10s */
473: if (fail_count < 100)
474: fail_count++;
475: delay = 100000 * fail_count;
476: debug("unlock failed, delaying %0.1lf seconds",
477: (double)delay/1000000);
478: usleep(delay);
479: }
480: explicit_bzero(passwdhash, sizeof(passwdhash));
1.88 markus 481: } else if (!locked && lock) {
1.203 dtucker 482: debug("agent locked");
1.88 markus 483: locked = 1;
1.203 dtucker 484: arc4random_buf(lock_salt, sizeof(lock_salt));
485: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1.213 djm 486: lock_pwhash, sizeof(lock_pwhash), LOCK_ROUNDS) < 0)
1.203 dtucker 487: fatal("bcrypt_pbkdf");
1.88 markus 488: success = 1;
489: }
1.203 dtucker 490: explicit_bzero(passwd, pwlen);
1.173 djm 491: free(passwd);
1.194 markus 492: send_status(e, success);
1.88 markus 493: }
494:
495: static void
1.221 ! djm 496: no_identities(SocketEntry *e)
1.88 markus 497: {
1.194 markus 498: struct sshbuf *msg;
499: int r;
1.88 markus 500:
1.194 markus 501: if ((msg = sshbuf_new()) == NULL)
502: fatal("%s: sshbuf_new failed", __func__);
1.221 ! djm 503: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
1.194 markus 504: (r = sshbuf_put_u32(msg, 0)) != 0 ||
505: (r = sshbuf_put_stringb(e->output, msg)) != 0)
506: fatal("%s: buffer error: %s", __func__, ssh_err(r));
507: sshbuf_free(msg);
1.88 markus 508: }
1.59 markus 509:
1.163 markus 510: #ifdef ENABLE_PKCS11
1.59 markus 511: static void
1.158 djm 512: process_add_smartcard_key(SocketEntry *e)
1.59 markus 513: {
1.215 djm 514: char *provider = NULL, *pin, canonical_provider[PATH_MAX];
1.221 ! djm 515: int r, i, count = 0, success = 0, confirm = 0;
1.194 markus 516: u_int seconds;
1.174 dtucker 517: time_t death = 0;
1.194 markus 518: u_char type;
519: struct sshkey **keys = NULL, *k;
1.84 markus 520: Identity *id;
1.75 deraadt 521:
1.194 markus 522: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
523: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
524: fatal("%s: buffer error: %s", __func__, ssh_err(r));
525:
526: while (sshbuf_len(e->request)) {
527: if ((r = sshbuf_get_u8(e->request, &type)) != 0)
528: fatal("%s: buffer error: %s", __func__, ssh_err(r));
529: switch (type) {
1.110 djm 530: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.194 markus 531: if ((r = sshbuf_get_u32(e->request, &seconds)) != 0)
532: fatal("%s: buffer error: %s",
533: __func__, ssh_err(r));
534: death = monotime() + seconds;
1.110 djm 535: break;
536: case SSH_AGENT_CONSTRAIN_CONFIRM:
537: confirm = 1;
538: break;
539: default:
1.221 ! djm 540: error("%s: Unknown constraint type %d", __func__, type);
1.158 djm 541: goto send;
1.110 djm 542: }
543: }
1.215 djm 544: if (realpath(provider, canonical_provider) == NULL) {
545: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
546: provider, strerror(errno));
547: goto send;
548: }
549: if (match_pattern_list(canonical_provider, pkcs11_whitelist, 0) != 1) {
550: verbose("refusing PKCS#11 add of \"%.100s\": "
551: "provider not whitelisted", canonical_provider);
552: goto send;
553: }
554: debug("%s: add %.100s", __func__, canonical_provider);
1.110 djm 555: if (lifetime && !death)
1.175 dtucker 556: death = monotime() + lifetime;
1.110 djm 557:
1.215 djm 558: count = pkcs11_add_provider(canonical_provider, pin, &keys);
1.163 markus 559: for (i = 0; i < count; i++) {
1.84 markus 560: k = keys[i];
1.221 ! djm 561: if (lookup_identity(k) == NULL) {
1.163 markus 562: id = xcalloc(1, sizeof(Identity));
1.84 markus 563: id->key = k;
1.215 djm 564: id->provider = xstrdup(canonical_provider);
565: id->comment = xstrdup(canonical_provider); /* XXX */
1.110 djm 566: id->death = death;
567: id->confirm = confirm;
1.221 ! djm 568: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
! 569: idtab->nentries++;
1.84 markus 570: success = 1;
571: } else {
1.194 markus 572: sshkey_free(k);
1.84 markus 573: }
574: keys[i] = NULL;
1.59 markus 575: }
576: send:
1.173 djm 577: free(pin);
578: free(provider);
579: free(keys);
1.194 markus 580: send_status(e, success);
1.59 markus 581: }
582:
583: static void
584: process_remove_smartcard_key(SocketEntry *e)
585: {
1.217 djm 586: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.221 ! djm 587: int r, success = 0;
1.163 markus 588: Identity *id, *nxt;
1.59 markus 589:
1.194 markus 590: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
591: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
592: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.173 djm 593: free(pin);
1.59 markus 594:
1.217 djm 595: if (realpath(provider, canonical_provider) == NULL) {
596: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
597: provider, strerror(errno));
598: goto send;
599: }
600:
601: debug("%s: remove %.100s", __func__, canonical_provider);
1.221 ! djm 602: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
! 603: nxt = TAILQ_NEXT(id, next);
! 604: /* Skip file--based keys */
! 605: if (id->provider == NULL)
! 606: continue;
! 607: if (!strcmp(canonical_provider, id->provider)) {
! 608: TAILQ_REMOVE(&idtab->idlist, id, next);
! 609: free_identity(id);
! 610: idtab->nentries--;
1.59 markus 611: }
612: }
1.217 djm 613: if (pkcs11_del_provider(canonical_provider) == 0)
1.163 markus 614: success = 1;
615: else
1.221 ! djm 616: error("%s: pkcs11_del_provider failed", __func__);
1.218 deraadt 617: send:
1.173 djm 618: free(provider);
1.194 markus 619: send_status(e, success);
1.59 markus 620: }
1.163 markus 621: #endif /* ENABLE_PKCS11 */
1.59 markus 622:
1.33 markus 623: /* dispatch incoming messages */
624:
1.55 itojun 625: static void
1.2 provos 626: process_message(SocketEntry *e)
1.1 deraadt 627: {
1.194 markus 628: u_int msg_len;
629: u_char type;
630: const u_char *cp;
631: int r;
1.89 markus 632:
1.194 markus 633: if (sshbuf_len(e->input) < 5)
1.21 markus 634: return; /* Incomplete message. */
1.194 markus 635: cp = sshbuf_ptr(e->input);
636: msg_len = PEEK_U32(cp);
1.21 markus 637: if (msg_len > 256 * 1024) {
1.101 stevesk 638: close_socket(e);
1.21 markus 639: return;
640: }
1.194 markus 641: if (sshbuf_len(e->input) < msg_len + 4)
1.21 markus 642: return;
1.87 markus 643:
644: /* move the current input to e->request */
1.194 markus 645: sshbuf_reset(e->request);
646: if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
647: (r = sshbuf_get_u8(e->request, &type)) != 0)
648: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 649:
1.88 markus 650: /* check wheter agent is locked */
651: if (locked && type != SSH_AGENTC_UNLOCK) {
1.194 markus 652: sshbuf_reset(e->request);
1.88 markus 653: switch (type) {
654: case SSH2_AGENTC_REQUEST_IDENTITIES:
655: /* send empty lists */
1.221 ! djm 656: no_identities(e);
1.88 markus 657: break;
658: default:
659: /* send a fail message for all other request types */
1.194 markus 660: send_status(e, 0);
1.88 markus 661: }
662: return;
663: }
664:
1.59 markus 665: debug("type %d", type);
1.21 markus 666: switch (type) {
1.88 markus 667: case SSH_AGENTC_LOCK:
668: case SSH_AGENTC_UNLOCK:
669: process_lock_agent(e, type == SSH_AGENTC_LOCK);
670: break;
1.21 markus 671: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.221 ! djm 672: process_remove_all_identities(e); /* safe for !WITH_SSH1 */
1.33 markus 673: break;
674: /* ssh2 */
675: case SSH2_AGENTC_SIGN_REQUEST:
676: process_sign_request2(e);
677: break;
678: case SSH2_AGENTC_REQUEST_IDENTITIES:
1.221 ! djm 679: process_request_identities(e);
1.33 markus 680: break;
681: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 682: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.221 ! djm 683: process_add_identity(e);
1.33 markus 684: break;
685: case SSH2_AGENTC_REMOVE_IDENTITY:
1.221 ! djm 686: process_remove_identity(e);
1.33 markus 687: break;
688: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
1.221 ! djm 689: process_remove_all_identities(e);
1.21 markus 690: break;
1.163 markus 691: #ifdef ENABLE_PKCS11
1.59 markus 692: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 693: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 694: process_add_smartcard_key(e);
1.75 deraadt 695: break;
1.59 markus 696: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
697: process_remove_smartcard_key(e);
1.75 deraadt 698: break;
1.163 markus 699: #endif /* ENABLE_PKCS11 */
1.21 markus 700: default:
701: /* Unknown message. Respond with failure. */
702: error("Unknown message %d", type);
1.194 markus 703: sshbuf_reset(e->request);
704: send_status(e, 0);
1.21 markus 705: break;
706: }
1.1 deraadt 707: }
708:
1.55 itojun 709: static void
1.73 stevesk 710: new_socket(sock_type type, int fd)
1.1 deraadt 711: {
1.112 markus 712: u_int i, old_alloc, new_alloc;
1.96 deraadt 713:
1.119 djm 714: set_nonblock(fd);
1.21 markus 715:
716: if (fd > max_fd)
717: max_fd = fd;
718:
719: for (i = 0; i < sockets_alloc; i++)
720: if (sockets[i].type == AUTH_UNUSED) {
721: sockets[i].fd = fd;
1.194 markus 722: if ((sockets[i].input = sshbuf_new()) == NULL)
723: fatal("%s: sshbuf_new failed", __func__);
724: if ((sockets[i].output = sshbuf_new()) == NULL)
725: fatal("%s: sshbuf_new failed", __func__);
726: if ((sockets[i].request = sshbuf_new()) == NULL)
727: fatal("%s: sshbuf_new failed", __func__);
1.112 markus 728: sockets[i].type = type;
1.21 markus 729: return;
730: }
731: old_alloc = sockets_alloc;
1.112 markus 732: new_alloc = sockets_alloc + 10;
1.200 deraadt 733: sockets = xreallocarray(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 734: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 735: sockets[i].type = AUTH_UNUSED;
1.112 markus 736: sockets_alloc = new_alloc;
1.21 markus 737: sockets[old_alloc].fd = fd;
1.194 markus 738: if ((sockets[old_alloc].input = sshbuf_new()) == NULL)
739: fatal("%s: sshbuf_new failed", __func__);
740: if ((sockets[old_alloc].output = sshbuf_new()) == NULL)
741: fatal("%s: sshbuf_new failed", __func__);
742: if ((sockets[old_alloc].request = sshbuf_new()) == NULL)
743: fatal("%s: sshbuf_new failed", __func__);
1.112 markus 744: sockets[old_alloc].type = type;
1.1 deraadt 745: }
746:
1.55 itojun 747: static int
1.155 dtucker 748: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
749: struct timeval **tvpp)
1.1 deraadt 750: {
1.174 dtucker 751: u_int i, sz;
1.46 markus 752: int n = 0;
1.155 dtucker 753: static struct timeval tv;
1.174 dtucker 754: time_t deadline;
1.46 markus 755:
756: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 757: switch (sockets[i].type) {
758: case AUTH_SOCKET:
759: case AUTH_CONNECTION:
1.214 deraadt 760: n = MAXIMUM(n, sockets[i].fd);
1.21 markus 761: break;
762: case AUTH_UNUSED:
763: break;
764: default:
765: fatal("Unknown socket type %d", sockets[i].type);
766: break;
767: }
1.46 markus 768: }
769:
770: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 771: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 772: free(*fdrp);
773: free(*fdwp);
1.46 markus 774: *fdrp = xmalloc(sz);
775: *fdwp = xmalloc(sz);
1.66 markus 776: *nallocp = sz;
1.46 markus 777: }
1.66 markus 778: if (n < *fdl)
779: debug("XXX shrink: %d < %d", n, *fdl);
780: *fdl = n;
1.46 markus 781: memset(*fdrp, 0, sz);
782: memset(*fdwp, 0, sz);
783:
784: for (i = 0; i < sockets_alloc; i++) {
785: switch (sockets[i].type) {
786: case AUTH_SOCKET:
787: case AUTH_CONNECTION:
788: FD_SET(sockets[i].fd, *fdrp);
1.194 markus 789: if (sshbuf_len(sockets[i].output) > 0)
1.46 markus 790: FD_SET(sockets[i].fd, *fdwp);
791: break;
792: default:
793: break;
794: }
795: }
1.155 dtucker 796: deadline = reaper();
797: if (parent_alive_interval != 0)
798: deadline = (deadline == 0) ? parent_alive_interval :
1.214 deraadt 799: MINIMUM(deadline, parent_alive_interval);
1.155 dtucker 800: if (deadline == 0) {
801: *tvpp = NULL;
802: } else {
803: tv.tv_sec = deadline;
804: tv.tv_usec = 0;
805: *tvpp = &tv;
806: }
1.46 markus 807: return (1);
1.21 markus 808: }
809:
1.55 itojun 810: static void
1.21 markus 811: after_select(fd_set *readset, fd_set *writeset)
812: {
1.96 deraadt 813: struct sockaddr_un sunaddr;
1.26 markus 814: socklen_t slen;
1.21 markus 815: char buf[1024];
1.194 markus 816: int len, sock, r;
1.162 djm 817: u_int i, orig_alloc;
1.103 markus 818: uid_t euid;
819: gid_t egid;
1.21 markus 820:
1.162 djm 821: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 822: switch (sockets[i].type) {
823: case AUTH_UNUSED:
824: break;
825: case AUTH_SOCKET:
826: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 827: slen = sizeof(sunaddr);
1.46 markus 828: sock = accept(sockets[i].fd,
1.131 deraadt 829: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 830: if (sock < 0) {
1.81 stevesk 831: error("accept from AUTH_SOCKET: %s",
832: strerror(errno));
1.103 markus 833: break;
834: }
835: if (getpeereid(sock, &euid, &egid) < 0) {
836: error("getpeereid %d failed: %s",
837: sock, strerror(errno));
838: close(sock);
839: break;
840: }
1.105 markus 841: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 842: error("uid mismatch: "
1.104 stevesk 843: "peer euid %u != uid %u",
844: (u_int) euid, (u_int) getuid());
1.103 markus 845: close(sock);
1.21 markus 846: break;
847: }
848: new_socket(AUTH_CONNECTION, sock);
849: }
850: break;
851: case AUTH_CONNECTION:
1.194 markus 852: if (sshbuf_len(sockets[i].output) > 0 &&
1.21 markus 853: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 854: len = write(sockets[i].fd,
1.194 markus 855: sshbuf_ptr(sockets[i].output),
856: sshbuf_len(sockets[i].output));
1.162 djm 857: if (len == -1 && (errno == EAGAIN ||
858: errno == EINTR))
859: continue;
1.21 markus 860: if (len <= 0) {
1.101 stevesk 861: close_socket(&sockets[i]);
1.21 markus 862: break;
863: }
1.194 markus 864: if ((r = sshbuf_consume(sockets[i].output,
865: len)) != 0)
866: fatal("%s: buffer error: %s",
867: __func__, ssh_err(r));
1.21 markus 868: }
869: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 870: len = read(sockets[i].fd, buf, sizeof(buf));
871: if (len == -1 && (errno == EAGAIN ||
872: errno == EINTR))
873: continue;
1.21 markus 874: if (len <= 0) {
1.101 stevesk 875: close_socket(&sockets[i]);
1.21 markus 876: break;
877: }
1.194 markus 878: if ((r = sshbuf_put(sockets[i].input,
879: buf, len)) != 0)
880: fatal("%s: buffer error: %s",
881: __func__, ssh_err(r));
1.190 dtucker 882: explicit_bzero(buf, sizeof(buf));
1.21 markus 883: process_message(&sockets[i]);
884: }
885: break;
886: default:
887: fatal("Unknown type %d", sockets[i].type);
888: }
1.1 deraadt 889: }
890:
1.55 itojun 891: static void
1.113 markus 892: cleanup_socket(void)
1.15 markus 893: {
1.187 djm 894: if (cleanup_pid != 0 && getpid() != cleanup_pid)
895: return;
896: debug("%s: cleanup", __func__);
1.48 deraadt 897: if (socket_name[0])
898: unlink(socket_name);
899: if (socket_dir[0])
900: rmdir(socket_dir);
1.10 markus 901: }
902:
1.114 markus 903: void
1.15 markus 904: cleanup_exit(int i)
905: {
1.113 markus 906: cleanup_socket();
907: _exit(i);
1.15 markus 908: }
909:
1.135 deraadt 910: /*ARGSUSED*/
1.55 itojun 911: static void
1.48 deraadt 912: cleanup_handler(int sig)
913: {
1.113 markus 914: cleanup_socket();
1.163 markus 915: #ifdef ENABLE_PKCS11
916: pkcs11_terminate();
917: #endif
1.48 deraadt 918: _exit(2);
1.113 markus 919: }
920:
1.68 markus 921: static void
1.155 dtucker 922: check_parent_exists(void)
1.68 markus 923: {
1.172 dtucker 924: /*
925: * If our parent has exited then getppid() will return (pid_t)1,
926: * so testing for that should be safe.
927: */
928: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 929: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 930: cleanup_socket();
931: _exit(2);
1.68 markus 932: }
1.48 deraadt 933: }
934:
1.55 itojun 935: static void
1.50 itojun 936: usage(void)
1.15 markus 937: {
1.184 deraadt 938: fprintf(stderr,
1.202 jmc 939: "usage: ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]\n"
1.215 djm 940: " [-P pkcs11_whitelist] [-t life] [command [arg ...]]\n"
1.184 deraadt 941: " ssh-agent [-c | -s] -k\n");
1.21 markus 942: exit(1);
1.15 markus 943: }
944:
1.2 provos 945: int
946: main(int ac, char **av)
1.1 deraadt 947: {
1.201 djm 948: int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 949: int sock, fd, ch, result, saved_errno;
1.120 avsm 950: u_int nalloc;
1.96 deraadt 951: char *shell, *format, *pidstr, *agentsocket = NULL;
952: fd_set *readsetp = NULL, *writesetp = NULL;
1.41 markus 953: struct rlimit rlim;
1.96 deraadt 954: extern int optind;
1.98 stevesk 955: extern char *optarg;
1.21 markus 956: pid_t pid;
1.96 deraadt 957: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 958: struct timeval *tvp = NULL;
1.161 tobias 959: size_t len;
1.189 djm 960: mode_t prev_mask;
1.123 djm 961:
1.212 dtucker 962: ssh_malloc_init(); /* must be called before any mallocs */
1.123 djm 963: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
964: sanitise_stdfd();
1.99 markus 965:
966: /* drop */
967: setegid(getgid());
968: setgid(getgid());
1.53 markus 969:
1.185 markus 970: #ifdef WITH_OPENSSL
1.170 djm 971: OpenSSL_add_all_algorithms();
1.185 markus 972: #endif
1.21 markus 973:
1.215 djm 974: while ((ch = getopt(ac, av, "cDdksE:a:P:t:")) != -1) {
1.21 markus 975: switch (ch) {
1.192 djm 976: case 'E':
977: fingerprint_hash = ssh_digest_alg_by_name(optarg);
978: if (fingerprint_hash == -1)
979: fatal("Invalid hash algorithm \"%s\"", optarg);
980: break;
1.21 markus 981: case 'c':
982: if (s_flag)
983: usage();
984: c_flag++;
985: break;
986: case 'k':
987: k_flag++;
988: break;
1.215 djm 989: case 'P':
990: if (pkcs11_whitelist != NULL)
991: fatal("-P option already specified");
992: pkcs11_whitelist = xstrdup(optarg);
993: break;
1.21 markus 994: case 's':
995: if (c_flag)
996: usage();
997: s_flag++;
998: break;
1.57 markus 999: case 'd':
1.201 djm 1000: if (d_flag || D_flag)
1.57 markus 1001: usage();
1002: d_flag++;
1003: break;
1.201 djm 1004: case 'D':
1005: if (d_flag || D_flag)
1006: usage();
1007: D_flag++;
1008: break;
1.86 markus 1009: case 'a':
1010: agentsocket = optarg;
1.106 marc 1011: break;
1012: case 't':
1013: if ((lifetime = convtime(optarg)) == -1) {
1014: fprintf(stderr, "Invalid lifetime\n");
1015: usage();
1016: }
1.86 markus 1017: break;
1.21 markus 1018: default:
1019: usage();
1020: }
1021: }
1022: ac -= optind;
1023: av += optind;
1024:
1.201 djm 1025: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag || D_flag))
1.21 markus 1026: usage();
1027:
1.215 djm 1028: if (pkcs11_whitelist == NULL)
1029: pkcs11_whitelist = xstrdup(DEFAULT_PKCS11_WHITELIST);
1030:
1.85 markus 1031: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1032: shell = getenv("SHELL");
1.161 tobias 1033: if (shell != NULL && (len = strlen(shell)) > 2 &&
1034: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1035: c_flag = 1;
1036: }
1037: if (k_flag) {
1.136 deraadt 1038: const char *errstr = NULL;
1039:
1.21 markus 1040: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1041: if (pidstr == NULL) {
1042: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1043: SSH_AGENTPID_ENV_NAME);
1.21 markus 1044: exit(1);
1045: }
1.136 deraadt 1046: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1047: if (errstr) {
1048: fprintf(stderr,
1049: "%s=\"%s\", which is not a good PID: %s\n",
1050: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1051: exit(1);
1052: }
1053: if (kill(pid, SIGTERM) == -1) {
1054: perror("kill");
1055: exit(1);
1056: }
1057: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1058: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1059: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1060: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1061: exit(0);
1062: }
1063: parent_pid = getpid();
1064:
1.86 markus 1065: if (agentsocket == NULL) {
1066: /* Create private directory for agent socket */
1.171 djm 1067: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1068: if (mkdtemp(socket_dir) == NULL) {
1069: perror("mkdtemp: private socket dir");
1070: exit(1);
1071: }
1.91 mpech 1072: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1073: (long)parent_pid);
1.86 markus 1074: } else {
1075: /* Try to use specified agent socket */
1076: socket_dir[0] = '\0';
1077: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1078: }
1079:
1.23 markus 1080: /*
1081: * Create socket early so it will exist before command gets run from
1082: * the parent.
1083: */
1.189 djm 1084: prev_mask = umask(0177);
1.188 millert 1085: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 1086: if (sock < 0) {
1.188 millert 1087: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 1088: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1089: cleanup_exit(1);
1090: }
1.189 djm 1091: umask(prev_mask);
1.46 markus 1092:
1.23 markus 1093: /*
1094: * Fork, and have the parent execute the command, if any, or present
1095: * the socket data. The child continues as the authentication agent.
1096: */
1.201 djm 1097: if (D_flag || d_flag) {
1098: log_init(__progname,
1099: d_flag ? SYSLOG_LEVEL_DEBUG3 : SYSLOG_LEVEL_INFO,
1100: SYSLOG_FACILITY_AUTH, 1);
1.57 markus 1101: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1102: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1103: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1104: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.210 dtucker 1105: fflush(stdout);
1.57 markus 1106: goto skip;
1107: }
1.21 markus 1108: pid = fork();
1109: if (pid == -1) {
1110: perror("fork");
1.81 stevesk 1111: cleanup_exit(1);
1.21 markus 1112: }
1113: if (pid != 0) { /* Parent - execute the given command. */
1114: close(sock);
1.91 mpech 1115: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1116: if (ac == 0) {
1117: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1118: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1119: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1120: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1121: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1122: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1123: exit(0);
1124: }
1.36 deraadt 1125: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1126: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1127: perror("setenv");
1128: exit(1);
1129: }
1.21 markus 1130: execvp(av[0], av);
1131: perror(av[0]);
1132: exit(1);
1133: }
1.81 stevesk 1134: /* child */
1135: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1136:
1137: if (setsid() == -1) {
1.81 stevesk 1138: error("setsid: %s", strerror(errno));
1.67 stevesk 1139: cleanup_exit(1);
1140: }
1141:
1142: (void)chdir("/");
1.107 markus 1143: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1144: /* XXX might close listen socket */
1145: (void)dup2(fd, STDIN_FILENO);
1146: (void)dup2(fd, STDOUT_FILENO);
1147: (void)dup2(fd, STDERR_FILENO);
1148: if (fd > 2)
1149: close(fd);
1150: }
1.21 markus 1151:
1.41 markus 1152: /* deny core dumps, since memory contains unencrypted private keys */
1153: rlim.rlim_cur = rlim.rlim_max = 0;
1154: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1155: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1156: cleanup_exit(1);
1157: }
1.57 markus 1158:
1159: skip:
1.187 djm 1160:
1161: cleanup_pid = getpid();
1.163 markus 1162:
1163: #ifdef ENABLE_PKCS11
1164: pkcs11_init(0);
1165: #endif
1.21 markus 1166: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1167: if (ac > 0)
1168: parent_alive_interval = 10;
1.33 markus 1169: idtab_init();
1.61 markus 1170: signal(SIGPIPE, SIG_IGN);
1.201 djm 1171: signal(SIGINT, (d_flag | D_flag) ? cleanup_handler : SIG_IGN);
1.48 deraadt 1172: signal(SIGHUP, cleanup_handler);
1173: signal(SIGTERM, cleanup_handler);
1.66 markus 1174: nalloc = 0;
1.205 djm 1175:
1.215 djm 1176: if (pledge("stdio rpath cpath unix id proc exec", NULL) == -1)
1.205 djm 1177: fatal("%s: pledge: %s", __progname, strerror(errno));
1.66 markus 1178:
1.21 markus 1179: while (1) {
1.155 dtucker 1180: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1181: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1182: saved_errno = errno;
1.155 dtucker 1183: if (parent_alive_interval != 0)
1184: check_parent_exists();
1185: (void) reaper(); /* remove expired keys */
1.154 dtucker 1186: if (result < 0) {
1187: if (saved_errno == EINTR)
1.21 markus 1188: continue;
1.154 dtucker 1189: fatal("select: %s", strerror(saved_errno));
1190: } else if (result > 0)
1191: after_select(readsetp, writesetp);
1.15 markus 1192: }
1.21 markus 1193: /* NOTREACHED */
1.1 deraadt 1194: }
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