Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.222
1.222 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.221 2017/04/30 23:29:10 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"
1.194 markus 63: #include "sshbuf.h"
64: #include "sshkey.h"
1.32 markus 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"
1.194 markus 70: #include "ssherr.h"
1.215 djm 71: #include "match.h"
1.7 deraadt 72:
1.163 markus 73: #ifdef ENABLE_PKCS11
74: #include "ssh-pkcs11.h"
1.71 jakob 75: #endif
1.59 markus 76:
1.215 djm 77: #ifndef DEFAULT_PKCS11_WHITELIST
1.216 djm 78: # define DEFAULT_PKCS11_WHITELIST "/usr/lib*/*,/usr/local/lib*/*"
1.215 djm 79: #endif
80:
1.73 stevesk 81: typedef enum {
82: AUTH_UNUSED,
83: AUTH_SOCKET,
84: AUTH_CONNECTION
85: } sock_type;
86:
1.21 markus 87: typedef struct {
88: int fd;
1.73 stevesk 89: sock_type type;
1.194 markus 90: struct sshbuf *input;
91: struct sshbuf *output;
92: struct sshbuf *request;
1.1 deraadt 93: } SocketEntry;
94:
1.45 markus 95: u_int sockets_alloc = 0;
1.1 deraadt 96: SocketEntry *sockets = NULL;
97:
1.78 provos 98: typedef struct identity {
99: TAILQ_ENTRY(identity) next;
1.194 markus 100: struct sshkey *key;
1.21 markus 101: char *comment;
1.163 markus 102: char *provider;
1.174 dtucker 103: time_t death;
1.107 markus 104: u_int confirm;
1.1 deraadt 105: } Identity;
106:
1.221 djm 107: struct idtable {
1.33 markus 108: int nentries;
1.78 provos 109: TAILQ_HEAD(idqueue, identity) idlist;
1.221 djm 110: };
1.33 markus 111:
1.221 djm 112: /* private key table */
113: struct idtable *idtab;
1.1 deraadt 114:
115: int max_fd = 0;
116:
1.11 markus 117: /* pid of shell == parent of agent */
1.29 deraadt 118: pid_t parent_pid = -1;
1.176 dtucker 119: time_t parent_alive_interval = 0;
1.10 markus 120:
1.187 djm 121: /* pid of process for which cleanup_socket is applicable */
122: pid_t cleanup_pid = 0;
123:
1.10 markus 124: /* pathname and directory for AUTH_SOCKET */
1.196 deraadt 125: char socket_name[PATH_MAX];
126: char socket_dir[PATH_MAX];
1.10 markus 127:
1.215 djm 128: /* PKCS#11 path whitelist */
129: static char *pkcs11_whitelist;
130:
1.88 markus 131: /* locking */
1.203 dtucker 132: #define LOCK_SIZE 32
133: #define LOCK_SALT_SIZE 16
134: #define LOCK_ROUNDS 1
1.88 markus 135: int locked = 0;
1.213 djm 136: u_char lock_pwhash[LOCK_SIZE];
137: u_char lock_salt[LOCK_SALT_SIZE];
1.88 markus 138:
1.20 markus 139: extern char *__progname;
140:
1.174 dtucker 141: /* Default lifetime in seconds (0 == forever) */
142: static long lifetime = 0;
1.106 marc 143:
1.192 djm 144: static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
145:
1.55 itojun 146: static void
1.101 stevesk 147: close_socket(SocketEntry *e)
148: {
149: close(e->fd);
150: e->fd = -1;
151: e->type = AUTH_UNUSED;
1.194 markus 152: sshbuf_free(e->input);
153: sshbuf_free(e->output);
154: sshbuf_free(e->request);
1.101 stevesk 155: }
156:
157: static void
1.33 markus 158: idtab_init(void)
1.1 deraadt 159: {
1.221 djm 160: idtab = xcalloc(1, sizeof(*idtab));
161: TAILQ_INIT(&idtab->idlist);
162: idtab->nentries = 0;
1.33 markus 163: }
164:
1.89 markus 165: static void
166: free_identity(Identity *id)
167: {
1.194 markus 168: sshkey_free(id->key);
1.173 djm 169: free(id->provider);
170: free(id->comment);
171: free(id);
1.89 markus 172: }
173:
1.33 markus 174: /* return matching private key for given public key */
1.78 provos 175: static Identity *
1.221 djm 176: lookup_identity(struct sshkey *key)
1.33 markus 177: {
1.78 provos 178: Identity *id;
179:
1.221 djm 180: TAILQ_FOREACH(id, &idtab->idlist, next) {
1.194 markus 181: if (sshkey_equal(key, id->key))
1.78 provos 182: return (id);
1.33 markus 183: }
1.78 provos 184: return (NULL);
185: }
186:
1.107 markus 187: /* Check confirmation of keysign request */
188: static int
189: confirm_key(Identity *id)
190: {
1.122 djm 191: char *p;
1.107 markus 192: int ret = -1;
193:
1.194 markus 194: p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT);
1.197 djm 195: if (p != NULL &&
196: ask_permission("Allow use of key %s?\nKey fingerprint %s.",
1.122 djm 197: id->comment, p))
198: ret = 0;
1.173 djm 199: free(p);
1.122 djm 200:
1.107 markus 201: return (ret);
202: }
203:
1.194 markus 204: static void
205: send_status(SocketEntry *e, int success)
206: {
207: int r;
208:
209: if ((r = sshbuf_put_u32(e->output, 1)) != 0 ||
210: (r = sshbuf_put_u8(e->output, success ?
211: SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0)
212: fatal("%s: buffer error: %s", __func__, ssh_err(r));
213: }
214:
1.33 markus 215: /* send list of supported public keys to 'client' */
1.55 itojun 216: static void
1.221 djm 217: process_request_identities(SocketEntry *e)
1.33 markus 218: {
1.96 deraadt 219: Identity *id;
1.194 markus 220: struct sshbuf *msg;
221: int r;
1.1 deraadt 222:
1.194 markus 223: if ((msg = sshbuf_new()) == NULL)
224: fatal("%s: sshbuf_new failed", __func__);
1.221 djm 225: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
226: (r = sshbuf_put_u32(msg, idtab->nentries)) != 0)
227: fatal("%s: buffer error: %s", __func__, ssh_err(r));
228: TAILQ_FOREACH(id, &idtab->idlist, next) {
229: if ((r = sshkey_puts(id->key, msg)) != 0 ||
230: (r = sshbuf_put_cstring(msg, id->comment)) != 0) {
231: error("%s: put key/comment: %s", __func__,
1.220 djm 232: ssh_err(r));
233: continue;
1.33 markus 234: }
1.21 markus 235: }
1.194 markus 236: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
237: fatal("%s: buffer error: %s", __func__, ssh_err(r));
238: sshbuf_free(msg);
1.1 deraadt 239: }
240:
1.33 markus 241:
1.208 markus 242: static char *
243: agent_decode_alg(struct sshkey *key, u_int flags)
244: {
245: if (key->type == KEY_RSA) {
246: if (flags & SSH_AGENT_RSA_SHA2_256)
247: return "rsa-sha2-256";
248: else if (flags & SSH_AGENT_RSA_SHA2_512)
249: return "rsa-sha2-512";
250: }
251: return NULL;
252: }
253:
1.33 markus 254: /* ssh2 only */
1.55 itojun 255: static void
1.33 markus 256: process_sign_request2(SocketEntry *e)
257: {
1.221 djm 258: const u_char *data;
259: u_char *signature = NULL;
260: size_t dlen, slen = 0;
1.194 markus 261: u_int compat = 0, flags;
262: int r, ok = -1;
263: struct sshbuf *msg;
1.221 djm 264: struct sshkey *key = NULL;
1.195 djm 265: struct identity *id;
1.194 markus 266:
1.195 djm 267: if ((msg = sshbuf_new()) == NULL)
268: fatal("%s: sshbuf_new failed", __func__);
1.221 djm 269: if ((r = sshkey_froms(e->request, &key)) != 0 ||
270: (r = sshbuf_get_string_direct(e->request, &data, &dlen)) != 0 ||
1.194 markus 271: (r = sshbuf_get_u32(e->request, &flags)) != 0)
272: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.37 markus 273: if (flags & SSH_AGENT_OLD_SIGNATURE)
1.194 markus 274: compat = SSH_BUG_SIGBLOB;
1.221 djm 275: if ((id = lookup_identity(key)) == NULL) {
1.195 djm 276: verbose("%s: %s key not found", __func__, sshkey_type(key));
277: goto send;
278: }
279: if (id->confirm && confirm_key(id) != 0) {
280: verbose("%s: user refused key", __func__);
281: goto send;
282: }
283: if ((r = sshkey_sign(id->key, &signature, &slen,
1.208 markus 284: data, dlen, agent_decode_alg(key, flags), compat)) != 0) {
1.209 djm 285: error("%s: sshkey_sign: %s", __func__, ssh_err(r));
1.195 djm 286: goto send;
1.33 markus 287: }
1.195 djm 288: /* Success */
289: ok = 0;
290: send:
291: sshkey_free(key);
1.33 markus 292: if (ok == 0) {
1.194 markus 293: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
294: (r = sshbuf_put_string(msg, signature, slen)) != 0)
295: fatal("%s: buffer error: %s", __func__, ssh_err(r));
296: } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
297: fatal("%s: buffer error: %s", __func__, ssh_err(r));
298:
299: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
300: fatal("%s: buffer error: %s", __func__, ssh_err(r));
301:
302: sshbuf_free(msg);
1.173 djm 303: free(signature);
1.1 deraadt 304: }
305:
1.33 markus 306: /* shared */
1.55 itojun 307: static void
1.221 djm 308: process_remove_identity(SocketEntry *e)
1.1 deraadt 309: {
1.194 markus 310: int r, success = 0;
311: struct sshkey *key = NULL;
1.221 djm 312: Identity *id;
1.21 markus 313:
1.221 djm 314: if ((r = sshkey_froms(e->request, &key)) != 0) {
315: error("%s: get key: %s", __func__, ssh_err(r));
316: goto done;
317: }
318: if ((id = lookup_identity(key)) == NULL) {
319: debug("%s: key not found", __func__);
320: goto done;
321: }
322: /* We have this key, free it. */
323: if (idtab->nentries < 1)
324: fatal("%s: internal error: nentries %d",
325: __func__, idtab->nentries);
326: TAILQ_REMOVE(&idtab->idlist, id, next);
327: free_identity(id);
328: idtab->nentries--;
329: sshkey_free(key);
330: success = 1;
331: done:
1.194 markus 332: send_status(e, success);
1.1 deraadt 333: }
334:
1.55 itojun 335: static void
1.221 djm 336: process_remove_all_identities(SocketEntry *e)
1.1 deraadt 337: {
1.78 provos 338: Identity *id;
1.21 markus 339:
340: /* Loop over all identities and clear the keys. */
1.221 djm 341: for (id = TAILQ_FIRST(&idtab->idlist); id;
342: id = TAILQ_FIRST(&idtab->idlist)) {
343: TAILQ_REMOVE(&idtab->idlist, id, next);
1.78 provos 344: free_identity(id);
1.21 markus 345: }
346:
347: /* Mark that there are no identities. */
1.221 djm 348: idtab->nentries = 0;
1.21 markus 349:
350: /* Send success. */
1.194 markus 351: send_status(e, 1);
1.1 deraadt 352: }
353:
1.155 dtucker 354: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 355: static time_t
1.89 markus 356: reaper(void)
357: {
1.175 dtucker 358: time_t deadline = 0, now = monotime();
1.89 markus 359: Identity *id, *nxt;
360:
1.221 djm 361: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
362: nxt = TAILQ_NEXT(id, next);
363: if (id->death == 0)
364: continue;
365: if (now >= id->death) {
366: debug("expiring key '%s'", id->comment);
367: TAILQ_REMOVE(&idtab->idlist, id, next);
368: free_identity(id);
369: idtab->nentries--;
370: } else
371: deadline = (deadline == 0) ? id->death :
372: MINIMUM(deadline, id->death);
1.89 markus 373: }
1.155 dtucker 374: if (deadline == 0 || deadline <= now)
375: return 0;
376: else
377: return (deadline - now);
1.89 markus 378: }
379:
380: static void
1.221 djm 381: process_add_identity(SocketEntry *e)
1.1 deraadt 382: {
1.157 canacar 383: Identity *id;
1.194 markus 384: int success = 0, confirm = 0;
385: u_int seconds;
386: char *comment = NULL;
1.174 dtucker 387: time_t death = 0;
1.194 markus 388: struct sshkey *k = NULL;
389: u_char ctype;
390: int r = SSH_ERR_INTERNAL_ERROR;
1.33 markus 391:
1.221 djm 392: if ((r = sshkey_private_deserialize(e->request, &k)) != 0 ||
393: k == NULL ||
1.194 markus 394: (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
395: error("%s: decode private key: %s", __func__, ssh_err(r));
396: goto err;
397: }
1.186 djm 398:
1.194 markus 399: while (sshbuf_len(e->request)) {
400: if ((r = sshbuf_get_u8(e->request, &ctype)) != 0) {
401: error("%s: buffer error: %s", __func__, ssh_err(r));
402: goto err;
403: }
404: switch (ctype) {
1.94 markus 405: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.194 markus 406: if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) {
407: error("%s: bad lifetime constraint: %s",
408: __func__, ssh_err(r));
409: goto err;
410: }
411: death = monotime() + seconds;
1.94 markus 412: break;
1.107 markus 413: case SSH_AGENT_CONSTRAIN_CONFIRM:
414: confirm = 1;
415: break;
1.94 markus 416: default:
1.194 markus 417: error("%s: Unknown constraint %d", __func__, ctype);
418: err:
419: sshbuf_reset(e->request);
1.173 djm 420: free(comment);
1.194 markus 421: sshkey_free(k);
1.158 djm 422: goto send;
1.94 markus 423: }
424: }
1.194 markus 425:
1.158 djm 426: success = 1;
1.106 marc 427: if (lifetime && !death)
1.175 dtucker 428: death = monotime() + lifetime;
1.221 djm 429: if ((id = lookup_identity(k)) == NULL) {
1.163 markus 430: id = xcalloc(1, sizeof(Identity));
1.78 provos 431: id->key = k;
1.221 djm 432: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1.33 markus 433: /* Increment the number of identities. */
1.221 djm 434: idtab->nentries++;
1.33 markus 435: } else {
1.194 markus 436: sshkey_free(k);
1.173 djm 437: free(id->comment);
1.33 markus 438: }
1.157 canacar 439: id->comment = comment;
440: id->death = death;
441: id->confirm = confirm;
1.33 markus 442: send:
1.194 markus 443: send_status(e, success);
1.1 deraadt 444: }
445:
1.88 markus 446: /* XXX todo: encrypt sensitive data with passphrase */
447: static void
448: process_lock_agent(SocketEntry *e, int lock)
449: {
1.203 dtucker 450: int r, success = 0, delay;
1.213 djm 451: char *passwd;
452: u_char passwdhash[LOCK_SIZE];
1.203 dtucker 453: static u_int fail_count = 0;
454: size_t pwlen;
455:
456: if ((r = sshbuf_get_cstring(e->request, &passwd, &pwlen)) != 0)
457: fatal("%s: buffer error: %s", __func__, ssh_err(r));
458: if (pwlen == 0) {
459: debug("empty password not supported");
460: } else if (locked && !lock) {
461: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
462: passwdhash, sizeof(passwdhash), LOCK_ROUNDS) < 0)
463: fatal("bcrypt_pbkdf");
1.213 djm 464: if (timingsafe_bcmp(passwdhash, lock_pwhash, LOCK_SIZE) == 0) {
1.203 dtucker 465: debug("agent unlocked");
466: locked = 0;
467: fail_count = 0;
1.213 djm 468: explicit_bzero(lock_pwhash, sizeof(lock_pwhash));
1.203 dtucker 469: success = 1;
470: } else {
471: /* delay in 0.1s increments up to 10s */
472: if (fail_count < 100)
473: fail_count++;
474: delay = 100000 * fail_count;
475: debug("unlock failed, delaying %0.1lf seconds",
476: (double)delay/1000000);
477: usleep(delay);
478: }
479: explicit_bzero(passwdhash, sizeof(passwdhash));
1.88 markus 480: } else if (!locked && lock) {
1.203 dtucker 481: debug("agent locked");
1.88 markus 482: locked = 1;
1.203 dtucker 483: arc4random_buf(lock_salt, sizeof(lock_salt));
484: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1.213 djm 485: lock_pwhash, sizeof(lock_pwhash), LOCK_ROUNDS) < 0)
1.203 dtucker 486: fatal("bcrypt_pbkdf");
1.88 markus 487: success = 1;
488: }
1.203 dtucker 489: explicit_bzero(passwd, pwlen);
1.173 djm 490: free(passwd);
1.194 markus 491: send_status(e, success);
1.88 markus 492: }
493:
494: static void
1.221 djm 495: no_identities(SocketEntry *e)
1.88 markus 496: {
1.194 markus 497: struct sshbuf *msg;
498: int r;
1.88 markus 499:
1.194 markus 500: if ((msg = sshbuf_new()) == NULL)
501: fatal("%s: sshbuf_new failed", __func__);
1.221 djm 502: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
1.194 markus 503: (r = sshbuf_put_u32(msg, 0)) != 0 ||
504: (r = sshbuf_put_stringb(e->output, msg)) != 0)
505: fatal("%s: buffer error: %s", __func__, ssh_err(r));
506: sshbuf_free(msg);
1.88 markus 507: }
1.59 markus 508:
1.163 markus 509: #ifdef ENABLE_PKCS11
1.59 markus 510: static void
1.158 djm 511: process_add_smartcard_key(SocketEntry *e)
1.59 markus 512: {
1.215 djm 513: char *provider = NULL, *pin, canonical_provider[PATH_MAX];
1.221 djm 514: int r, i, count = 0, success = 0, confirm = 0;
1.194 markus 515: u_int seconds;
1.174 dtucker 516: time_t death = 0;
1.194 markus 517: u_char type;
518: struct sshkey **keys = NULL, *k;
1.84 markus 519: Identity *id;
1.75 deraadt 520:
1.194 markus 521: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
522: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
523: fatal("%s: buffer error: %s", __func__, ssh_err(r));
524:
525: while (sshbuf_len(e->request)) {
526: if ((r = sshbuf_get_u8(e->request, &type)) != 0)
527: fatal("%s: buffer error: %s", __func__, ssh_err(r));
528: switch (type) {
1.110 djm 529: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.194 markus 530: if ((r = sshbuf_get_u32(e->request, &seconds)) != 0)
531: fatal("%s: buffer error: %s",
532: __func__, ssh_err(r));
533: death = monotime() + seconds;
1.110 djm 534: break;
535: case SSH_AGENT_CONSTRAIN_CONFIRM:
536: confirm = 1;
537: break;
538: default:
1.221 djm 539: error("%s: Unknown constraint type %d", __func__, type);
1.158 djm 540: goto send;
1.110 djm 541: }
542: }
1.215 djm 543: if (realpath(provider, canonical_provider) == NULL) {
544: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
545: provider, strerror(errno));
546: goto send;
547: }
548: if (match_pattern_list(canonical_provider, pkcs11_whitelist, 0) != 1) {
549: verbose("refusing PKCS#11 add of \"%.100s\": "
550: "provider not whitelisted", canonical_provider);
551: goto send;
552: }
553: debug("%s: add %.100s", __func__, canonical_provider);
1.110 djm 554: if (lifetime && !death)
1.175 dtucker 555: death = monotime() + lifetime;
1.110 djm 556:
1.215 djm 557: count = pkcs11_add_provider(canonical_provider, pin, &keys);
1.163 markus 558: for (i = 0; i < count; i++) {
1.84 markus 559: k = keys[i];
1.221 djm 560: if (lookup_identity(k) == NULL) {
1.163 markus 561: id = xcalloc(1, sizeof(Identity));
1.84 markus 562: id->key = k;
1.215 djm 563: id->provider = xstrdup(canonical_provider);
564: id->comment = xstrdup(canonical_provider); /* XXX */
1.110 djm 565: id->death = death;
566: id->confirm = confirm;
1.221 djm 567: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
568: idtab->nentries++;
1.84 markus 569: success = 1;
570: } else {
1.194 markus 571: sshkey_free(k);
1.84 markus 572: }
573: keys[i] = NULL;
1.59 markus 574: }
575: send:
1.173 djm 576: free(pin);
577: free(provider);
578: free(keys);
1.194 markus 579: send_status(e, success);
1.59 markus 580: }
581:
582: static void
583: process_remove_smartcard_key(SocketEntry *e)
584: {
1.217 djm 585: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.221 djm 586: int r, success = 0;
1.163 markus 587: Identity *id, *nxt;
1.59 markus 588:
1.194 markus 589: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
590: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
591: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.173 djm 592: free(pin);
1.59 markus 593:
1.217 djm 594: if (realpath(provider, canonical_provider) == NULL) {
595: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
596: provider, strerror(errno));
597: goto send;
598: }
599:
600: debug("%s: remove %.100s", __func__, canonical_provider);
1.221 djm 601: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
602: nxt = TAILQ_NEXT(id, next);
603: /* Skip file--based keys */
604: if (id->provider == NULL)
605: continue;
606: if (!strcmp(canonical_provider, id->provider)) {
607: TAILQ_REMOVE(&idtab->idlist, id, next);
608: free_identity(id);
609: idtab->nentries--;
1.59 markus 610: }
611: }
1.217 djm 612: if (pkcs11_del_provider(canonical_provider) == 0)
1.163 markus 613: success = 1;
614: else
1.221 djm 615: error("%s: pkcs11_del_provider failed", __func__);
1.218 deraadt 616: send:
1.173 djm 617: free(provider);
1.194 markus 618: send_status(e, success);
1.59 markus 619: }
1.163 markus 620: #endif /* ENABLE_PKCS11 */
1.59 markus 621:
1.33 markus 622: /* dispatch incoming messages */
623:
1.55 itojun 624: static void
1.2 provos 625: process_message(SocketEntry *e)
1.1 deraadt 626: {
1.194 markus 627: u_int msg_len;
628: u_char type;
629: const u_char *cp;
630: int r;
1.89 markus 631:
1.194 markus 632: if (sshbuf_len(e->input) < 5)
1.21 markus 633: return; /* Incomplete message. */
1.194 markus 634: cp = sshbuf_ptr(e->input);
635: msg_len = PEEK_U32(cp);
1.21 markus 636: if (msg_len > 256 * 1024) {
1.101 stevesk 637: close_socket(e);
1.21 markus 638: return;
639: }
1.194 markus 640: if (sshbuf_len(e->input) < msg_len + 4)
1.21 markus 641: return;
1.87 markus 642:
643: /* move the current input to e->request */
1.194 markus 644: sshbuf_reset(e->request);
645: if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
646: (r = sshbuf_get_u8(e->request, &type)) != 0)
647: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 648:
1.88 markus 649: /* check wheter agent is locked */
650: if (locked && type != SSH_AGENTC_UNLOCK) {
1.194 markus 651: sshbuf_reset(e->request);
1.88 markus 652: switch (type) {
653: case SSH2_AGENTC_REQUEST_IDENTITIES:
654: /* send empty lists */
1.221 djm 655: no_identities(e);
1.88 markus 656: break;
657: default:
658: /* send a fail message for all other request types */
1.194 markus 659: send_status(e, 0);
1.88 markus 660: }
661: return;
662: }
663:
1.59 markus 664: debug("type %d", type);
1.21 markus 665: switch (type) {
1.88 markus 666: case SSH_AGENTC_LOCK:
667: case SSH_AGENTC_UNLOCK:
668: process_lock_agent(e, type == SSH_AGENTC_LOCK);
669: break;
1.21 markus 670: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.221 djm 671: process_remove_all_identities(e); /* safe for !WITH_SSH1 */
1.33 markus 672: break;
673: /* ssh2 */
674: case SSH2_AGENTC_SIGN_REQUEST:
675: process_sign_request2(e);
676: break;
677: case SSH2_AGENTC_REQUEST_IDENTITIES:
1.221 djm 678: process_request_identities(e);
1.33 markus 679: break;
680: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 681: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.221 djm 682: process_add_identity(e);
1.33 markus 683: break;
684: case SSH2_AGENTC_REMOVE_IDENTITY:
1.221 djm 685: process_remove_identity(e);
1.33 markus 686: break;
687: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
1.221 djm 688: process_remove_all_identities(e);
1.21 markus 689: break;
1.163 markus 690: #ifdef ENABLE_PKCS11
1.59 markus 691: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 692: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 693: process_add_smartcard_key(e);
1.75 deraadt 694: break;
1.59 markus 695: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
696: process_remove_smartcard_key(e);
1.75 deraadt 697: break;
1.163 markus 698: #endif /* ENABLE_PKCS11 */
1.21 markus 699: default:
700: /* Unknown message. Respond with failure. */
701: error("Unknown message %d", type);
1.194 markus 702: sshbuf_reset(e->request);
703: send_status(e, 0);
1.21 markus 704: break;
705: }
1.1 deraadt 706: }
707:
1.55 itojun 708: static void
1.73 stevesk 709: new_socket(sock_type type, int fd)
1.1 deraadt 710: {
1.112 markus 711: u_int i, old_alloc, new_alloc;
1.96 deraadt 712:
1.119 djm 713: set_nonblock(fd);
1.21 markus 714:
715: if (fd > max_fd)
716: max_fd = fd;
717:
718: for (i = 0; i < sockets_alloc; i++)
719: if (sockets[i].type == AUTH_UNUSED) {
720: sockets[i].fd = fd;
1.194 markus 721: if ((sockets[i].input = sshbuf_new()) == NULL)
722: fatal("%s: sshbuf_new failed", __func__);
723: if ((sockets[i].output = sshbuf_new()) == NULL)
724: fatal("%s: sshbuf_new failed", __func__);
725: if ((sockets[i].request = sshbuf_new()) == NULL)
726: fatal("%s: sshbuf_new failed", __func__);
1.112 markus 727: sockets[i].type = type;
1.21 markus 728: return;
729: }
730: old_alloc = sockets_alloc;
1.112 markus 731: new_alloc = sockets_alloc + 10;
1.200 deraadt 732: sockets = xreallocarray(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 733: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 734: sockets[i].type = AUTH_UNUSED;
1.112 markus 735: sockets_alloc = new_alloc;
1.21 markus 736: sockets[old_alloc].fd = fd;
1.194 markus 737: if ((sockets[old_alloc].input = sshbuf_new()) == NULL)
738: fatal("%s: sshbuf_new failed", __func__);
739: if ((sockets[old_alloc].output = sshbuf_new()) == NULL)
740: fatal("%s: sshbuf_new failed", __func__);
741: if ((sockets[old_alloc].request = sshbuf_new()) == NULL)
742: fatal("%s: sshbuf_new failed", __func__);
1.112 markus 743: sockets[old_alloc].type = type;
1.1 deraadt 744: }
745:
1.55 itojun 746: static int
1.155 dtucker 747: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
748: struct timeval **tvpp)
1.1 deraadt 749: {
1.174 dtucker 750: u_int i, sz;
1.46 markus 751: int n = 0;
1.155 dtucker 752: static struct timeval tv;
1.174 dtucker 753: time_t deadline;
1.46 markus 754:
755: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 756: switch (sockets[i].type) {
757: case AUTH_SOCKET:
758: case AUTH_CONNECTION:
1.214 deraadt 759: n = MAXIMUM(n, sockets[i].fd);
1.21 markus 760: break;
761: case AUTH_UNUSED:
762: break;
763: default:
764: fatal("Unknown socket type %d", sockets[i].type);
765: break;
766: }
1.46 markus 767: }
768:
769: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 770: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 771: free(*fdrp);
772: free(*fdwp);
1.46 markus 773: *fdrp = xmalloc(sz);
774: *fdwp = xmalloc(sz);
1.66 markus 775: *nallocp = sz;
1.46 markus 776: }
1.66 markus 777: if (n < *fdl)
778: debug("XXX shrink: %d < %d", n, *fdl);
779: *fdl = n;
1.46 markus 780: memset(*fdrp, 0, sz);
781: memset(*fdwp, 0, sz);
782:
783: for (i = 0; i < sockets_alloc; i++) {
784: switch (sockets[i].type) {
785: case AUTH_SOCKET:
786: case AUTH_CONNECTION:
787: FD_SET(sockets[i].fd, *fdrp);
1.194 markus 788: if (sshbuf_len(sockets[i].output) > 0)
1.46 markus 789: FD_SET(sockets[i].fd, *fdwp);
790: break;
791: default:
792: break;
793: }
794: }
1.155 dtucker 795: deadline = reaper();
796: if (parent_alive_interval != 0)
797: deadline = (deadline == 0) ? parent_alive_interval :
1.214 deraadt 798: MINIMUM(deadline, parent_alive_interval);
1.155 dtucker 799: if (deadline == 0) {
800: *tvpp = NULL;
801: } else {
802: tv.tv_sec = deadline;
803: tv.tv_usec = 0;
804: *tvpp = &tv;
805: }
1.46 markus 806: return (1);
1.21 markus 807: }
808:
1.55 itojun 809: static void
1.21 markus 810: after_select(fd_set *readset, fd_set *writeset)
811: {
1.96 deraadt 812: struct sockaddr_un sunaddr;
1.26 markus 813: socklen_t slen;
1.21 markus 814: char buf[1024];
1.194 markus 815: int len, sock, r;
1.162 djm 816: u_int i, orig_alloc;
1.103 markus 817: uid_t euid;
818: gid_t egid;
1.21 markus 819:
1.162 djm 820: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 821: switch (sockets[i].type) {
822: case AUTH_UNUSED:
823: break;
824: case AUTH_SOCKET:
825: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 826: slen = sizeof(sunaddr);
1.46 markus 827: sock = accept(sockets[i].fd,
1.131 deraadt 828: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 829: if (sock < 0) {
1.81 stevesk 830: error("accept from AUTH_SOCKET: %s",
831: strerror(errno));
1.103 markus 832: break;
833: }
834: if (getpeereid(sock, &euid, &egid) < 0) {
835: error("getpeereid %d failed: %s",
836: sock, strerror(errno));
837: close(sock);
838: break;
839: }
1.105 markus 840: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 841: error("uid mismatch: "
1.104 stevesk 842: "peer euid %u != uid %u",
843: (u_int) euid, (u_int) getuid());
1.103 markus 844: close(sock);
1.21 markus 845: break;
846: }
847: new_socket(AUTH_CONNECTION, sock);
848: }
849: break;
850: case AUTH_CONNECTION:
1.194 markus 851: if (sshbuf_len(sockets[i].output) > 0 &&
1.21 markus 852: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 853: len = write(sockets[i].fd,
1.194 markus 854: sshbuf_ptr(sockets[i].output),
855: sshbuf_len(sockets[i].output));
1.162 djm 856: if (len == -1 && (errno == EAGAIN ||
857: errno == EINTR))
858: continue;
1.21 markus 859: if (len <= 0) {
1.101 stevesk 860: close_socket(&sockets[i]);
1.21 markus 861: break;
862: }
1.194 markus 863: if ((r = sshbuf_consume(sockets[i].output,
864: len)) != 0)
865: fatal("%s: buffer error: %s",
866: __func__, ssh_err(r));
1.21 markus 867: }
868: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 869: len = read(sockets[i].fd, buf, sizeof(buf));
870: if (len == -1 && (errno == EAGAIN ||
871: errno == EINTR))
872: continue;
1.21 markus 873: if (len <= 0) {
1.101 stevesk 874: close_socket(&sockets[i]);
1.21 markus 875: break;
876: }
1.194 markus 877: if ((r = sshbuf_put(sockets[i].input,
878: buf, len)) != 0)
879: fatal("%s: buffer error: %s",
880: __func__, ssh_err(r));
1.190 dtucker 881: explicit_bzero(buf, sizeof(buf));
1.21 markus 882: process_message(&sockets[i]);
883: }
884: break;
885: default:
886: fatal("Unknown type %d", sockets[i].type);
887: }
1.1 deraadt 888: }
889:
1.55 itojun 890: static void
1.113 markus 891: cleanup_socket(void)
1.15 markus 892: {
1.187 djm 893: if (cleanup_pid != 0 && getpid() != cleanup_pid)
894: return;
895: debug("%s: cleanup", __func__);
1.48 deraadt 896: if (socket_name[0])
897: unlink(socket_name);
898: if (socket_dir[0])
899: rmdir(socket_dir);
1.10 markus 900: }
901:
1.114 markus 902: void
1.15 markus 903: cleanup_exit(int i)
904: {
1.113 markus 905: cleanup_socket();
906: _exit(i);
1.15 markus 907: }
908:
1.135 deraadt 909: /*ARGSUSED*/
1.55 itojun 910: static void
1.48 deraadt 911: cleanup_handler(int sig)
912: {
1.113 markus 913: cleanup_socket();
1.163 markus 914: #ifdef ENABLE_PKCS11
915: pkcs11_terminate();
916: #endif
1.48 deraadt 917: _exit(2);
1.113 markus 918: }
919:
1.68 markus 920: static void
1.155 dtucker 921: check_parent_exists(void)
1.68 markus 922: {
1.172 dtucker 923: /*
924: * If our parent has exited then getppid() will return (pid_t)1,
925: * so testing for that should be safe.
926: */
927: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 928: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 929: cleanup_socket();
930: _exit(2);
1.68 markus 931: }
1.48 deraadt 932: }
933:
1.55 itojun 934: static void
1.50 itojun 935: usage(void)
1.15 markus 936: {
1.184 deraadt 937: fprintf(stderr,
1.202 jmc 938: "usage: ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]\n"
1.215 djm 939: " [-P pkcs11_whitelist] [-t life] [command [arg ...]]\n"
1.184 deraadt 940: " ssh-agent [-c | -s] -k\n");
1.21 markus 941: exit(1);
1.15 markus 942: }
943:
1.2 provos 944: int
945: main(int ac, char **av)
1.1 deraadt 946: {
1.201 djm 947: int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 948: int sock, fd, ch, result, saved_errno;
1.120 avsm 949: u_int nalloc;
1.96 deraadt 950: char *shell, *format, *pidstr, *agentsocket = NULL;
951: fd_set *readsetp = NULL, *writesetp = NULL;
1.41 markus 952: struct rlimit rlim;
1.96 deraadt 953: extern int optind;
1.98 stevesk 954: extern char *optarg;
1.21 markus 955: pid_t pid;
1.96 deraadt 956: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 957: struct timeval *tvp = NULL;
1.161 tobias 958: size_t len;
1.189 djm 959: mode_t prev_mask;
1.123 djm 960:
1.212 dtucker 961: ssh_malloc_init(); /* must be called before any mallocs */
1.123 djm 962: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
963: sanitise_stdfd();
1.99 markus 964:
965: /* drop */
966: setegid(getgid());
967: setgid(getgid());
1.53 markus 968:
1.185 markus 969: #ifdef WITH_OPENSSL
1.170 djm 970: OpenSSL_add_all_algorithms();
1.185 markus 971: #endif
1.21 markus 972:
1.215 djm 973: while ((ch = getopt(ac, av, "cDdksE:a:P:t:")) != -1) {
1.21 markus 974: switch (ch) {
1.192 djm 975: case 'E':
976: fingerprint_hash = ssh_digest_alg_by_name(optarg);
977: if (fingerprint_hash == -1)
978: fatal("Invalid hash algorithm \"%s\"", optarg);
979: break;
1.21 markus 980: case 'c':
981: if (s_flag)
982: usage();
983: c_flag++;
984: break;
985: case 'k':
986: k_flag++;
987: break;
1.215 djm 988: case 'P':
989: if (pkcs11_whitelist != NULL)
990: fatal("-P option already specified");
991: pkcs11_whitelist = xstrdup(optarg);
992: break;
1.21 markus 993: case 's':
994: if (c_flag)
995: usage();
996: s_flag++;
997: break;
1.57 markus 998: case 'd':
1.201 djm 999: if (d_flag || D_flag)
1.57 markus 1000: usage();
1001: d_flag++;
1002: break;
1.201 djm 1003: case 'D':
1004: if (d_flag || D_flag)
1005: usage();
1006: D_flag++;
1007: break;
1.86 markus 1008: case 'a':
1009: agentsocket = optarg;
1.106 marc 1010: break;
1011: case 't':
1012: if ((lifetime = convtime(optarg)) == -1) {
1013: fprintf(stderr, "Invalid lifetime\n");
1014: usage();
1015: }
1.86 markus 1016: break;
1.21 markus 1017: default:
1018: usage();
1019: }
1020: }
1021: ac -= optind;
1022: av += optind;
1023:
1.201 djm 1024: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag || D_flag))
1.21 markus 1025: usage();
1026:
1.215 djm 1027: if (pkcs11_whitelist == NULL)
1028: pkcs11_whitelist = xstrdup(DEFAULT_PKCS11_WHITELIST);
1029:
1.85 markus 1030: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1031: shell = getenv("SHELL");
1.161 tobias 1032: if (shell != NULL && (len = strlen(shell)) > 2 &&
1033: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1034: c_flag = 1;
1035: }
1036: if (k_flag) {
1.136 deraadt 1037: const char *errstr = NULL;
1038:
1.21 markus 1039: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1040: if (pidstr == NULL) {
1041: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1042: SSH_AGENTPID_ENV_NAME);
1.21 markus 1043: exit(1);
1044: }
1.136 deraadt 1045: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1046: if (errstr) {
1047: fprintf(stderr,
1048: "%s=\"%s\", which is not a good PID: %s\n",
1049: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1050: exit(1);
1051: }
1052: if (kill(pid, SIGTERM) == -1) {
1053: perror("kill");
1054: exit(1);
1055: }
1056: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1057: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1058: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1059: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1060: exit(0);
1061: }
1062: parent_pid = getpid();
1063:
1.86 markus 1064: if (agentsocket == NULL) {
1065: /* Create private directory for agent socket */
1.171 djm 1066: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1067: if (mkdtemp(socket_dir) == NULL) {
1068: perror("mkdtemp: private socket dir");
1069: exit(1);
1070: }
1.91 mpech 1071: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1072: (long)parent_pid);
1.86 markus 1073: } else {
1074: /* Try to use specified agent socket */
1075: socket_dir[0] = '\0';
1076: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1077: }
1078:
1.23 markus 1079: /*
1080: * Create socket early so it will exist before command gets run from
1081: * the parent.
1082: */
1.189 djm 1083: prev_mask = umask(0177);
1.188 millert 1084: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 1085: if (sock < 0) {
1.188 millert 1086: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 1087: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1088: cleanup_exit(1);
1089: }
1.189 djm 1090: umask(prev_mask);
1.46 markus 1091:
1.23 markus 1092: /*
1093: * Fork, and have the parent execute the command, if any, or present
1094: * the socket data. The child continues as the authentication agent.
1095: */
1.201 djm 1096: if (D_flag || d_flag) {
1097: log_init(__progname,
1098: d_flag ? SYSLOG_LEVEL_DEBUG3 : SYSLOG_LEVEL_INFO,
1099: SYSLOG_FACILITY_AUTH, 1);
1.57 markus 1100: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1101: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1102: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1103: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.210 dtucker 1104: fflush(stdout);
1.57 markus 1105: goto skip;
1106: }
1.21 markus 1107: pid = fork();
1108: if (pid == -1) {
1109: perror("fork");
1.81 stevesk 1110: cleanup_exit(1);
1.21 markus 1111: }
1112: if (pid != 0) { /* Parent - execute the given command. */
1113: close(sock);
1.91 mpech 1114: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1115: if (ac == 0) {
1116: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1117: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1118: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1119: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1120: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1121: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1122: exit(0);
1123: }
1.36 deraadt 1124: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1125: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1126: perror("setenv");
1127: exit(1);
1128: }
1.21 markus 1129: execvp(av[0], av);
1130: perror(av[0]);
1131: exit(1);
1132: }
1.81 stevesk 1133: /* child */
1134: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1135:
1136: if (setsid() == -1) {
1.81 stevesk 1137: error("setsid: %s", strerror(errno));
1.67 stevesk 1138: cleanup_exit(1);
1139: }
1140:
1141: (void)chdir("/");
1.107 markus 1142: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1143: /* XXX might close listen socket */
1144: (void)dup2(fd, STDIN_FILENO);
1145: (void)dup2(fd, STDOUT_FILENO);
1146: (void)dup2(fd, STDERR_FILENO);
1147: if (fd > 2)
1148: close(fd);
1149: }
1.21 markus 1150:
1.41 markus 1151: /* deny core dumps, since memory contains unencrypted private keys */
1152: rlim.rlim_cur = rlim.rlim_max = 0;
1153: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1154: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1155: cleanup_exit(1);
1156: }
1.57 markus 1157:
1158: skip:
1.187 djm 1159:
1160: cleanup_pid = getpid();
1.163 markus 1161:
1162: #ifdef ENABLE_PKCS11
1163: pkcs11_init(0);
1164: #endif
1.21 markus 1165: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1166: if (ac > 0)
1167: parent_alive_interval = 10;
1.33 markus 1168: idtab_init();
1.61 markus 1169: signal(SIGPIPE, SIG_IGN);
1.201 djm 1170: signal(SIGINT, (d_flag | D_flag) ? cleanup_handler : SIG_IGN);
1.48 deraadt 1171: signal(SIGHUP, cleanup_handler);
1172: signal(SIGTERM, cleanup_handler);
1.66 markus 1173: nalloc = 0;
1.205 djm 1174:
1.215 djm 1175: if (pledge("stdio rpath cpath unix id proc exec", NULL) == -1)
1.205 djm 1176: fatal("%s: pledge: %s", __progname, strerror(errno));
1.66 markus 1177:
1.21 markus 1178: while (1) {
1.155 dtucker 1179: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1180: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1181: saved_errno = errno;
1.155 dtucker 1182: if (parent_alive_interval != 0)
1183: check_parent_exists();
1184: (void) reaper(); /* remove expired keys */
1.154 dtucker 1185: if (result < 0) {
1186: if (saved_errno == EINTR)
1.21 markus 1187: continue;
1.154 dtucker 1188: fatal("select: %s", strerror(saved_errno));
1189: } else if (result > 0)
1190: after_select(readsetp, writesetp);
1.15 markus 1191: }
1.21 markus 1192: /* NOTREACHED */
1.1 deraadt 1193: }
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