Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.186
1.186 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.185 2014/04/29 18:01:49 markus 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:
115: /* pathname and directory for AUTH_SOCKET */
1.132 djm 116: char socket_name[MAXPATHLEN];
117: char socket_dir[MAXPATHLEN];
1.10 markus 118:
1.88 markus 119: /* locking */
120: int locked = 0;
121: char *lock_passwd = NULL;
122:
1.20 markus 123: extern char *__progname;
124:
1.174 dtucker 125: /* Default lifetime in seconds (0 == forever) */
126: static long lifetime = 0;
1.106 marc 127:
1.55 itojun 128: static void
1.101 stevesk 129: close_socket(SocketEntry *e)
130: {
131: close(e->fd);
132: e->fd = -1;
133: e->type = AUTH_UNUSED;
134: buffer_free(&e->input);
135: buffer_free(&e->output);
136: buffer_free(&e->request);
137: }
138:
139: static void
1.33 markus 140: idtab_init(void)
1.1 deraadt 141: {
1.33 markus 142: int i;
1.96 deraadt 143:
1.74 deraadt 144: for (i = 0; i <=2; i++) {
1.78 provos 145: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 146: idtable[i].nentries = 0;
147: }
148: }
149:
150: /* return private key table for requested protocol version */
1.55 itojun 151: static Idtab *
1.33 markus 152: idtab_lookup(int version)
153: {
154: if (version < 1 || version > 2)
155: fatal("internal error, bad protocol version %d", version);
156: return &idtable[version];
157: }
158:
1.89 markus 159: static void
160: free_identity(Identity *id)
161: {
162: key_free(id->key);
1.173 djm 163: free(id->provider);
164: free(id->comment);
165: free(id);
1.89 markus 166: }
167:
1.33 markus 168: /* return matching private key for given public key */
1.78 provos 169: static Identity *
170: lookup_identity(Key *key, int version)
1.33 markus 171: {
1.78 provos 172: Identity *id;
173:
1.33 markus 174: Idtab *tab = idtab_lookup(version);
1.78 provos 175: TAILQ_FOREACH(id, &tab->idlist, next) {
176: if (key_equal(key, id->key))
177: return (id);
1.33 markus 178: }
1.78 provos 179: return (NULL);
180: }
181:
1.107 markus 182: /* Check confirmation of keysign request */
183: static int
184: confirm_key(Identity *id)
185: {
1.122 djm 186: char *p;
1.107 markus 187: int ret = -1;
188:
189: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 190: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
191: id->comment, p))
192: ret = 0;
1.173 djm 193: free(p);
1.122 djm 194:
1.107 markus 195: return (ret);
196: }
197:
1.33 markus 198: /* send list of supported public keys to 'client' */
1.55 itojun 199: static void
1.33 markus 200: process_request_identities(SocketEntry *e, int version)
201: {
202: Idtab *tab = idtab_lookup(version);
1.96 deraadt 203: Identity *id;
1.21 markus 204: Buffer msg;
1.1 deraadt 205:
1.21 markus 206: buffer_init(&msg);
1.33 markus 207: buffer_put_char(&msg, (version == 1) ?
208: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
209: buffer_put_int(&msg, tab->nentries);
1.78 provos 210: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 211: if (id->key->type == KEY_RSA1) {
1.185 markus 212: #ifdef WITH_SSH1
1.33 markus 213: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
214: buffer_put_bignum(&msg, id->key->rsa->e);
215: buffer_put_bignum(&msg, id->key->rsa->n);
1.185 markus 216: #endif
1.33 markus 217: } else {
1.45 markus 218: u_char *blob;
219: u_int blen;
1.39 markus 220: key_to_blob(id->key, &blob, &blen);
1.33 markus 221: buffer_put_string(&msg, blob, blen);
1.173 djm 222: free(blob);
1.33 markus 223: }
224: buffer_put_cstring(&msg, id->comment);
1.21 markus 225: }
226: buffer_put_int(&e->output, buffer_len(&msg));
227: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
228: buffer_free(&msg);
1.1 deraadt 229: }
230:
1.185 markus 231: #ifdef WITH_SSH1
1.33 markus 232: /* ssh1 only */
1.55 itojun 233: static void
1.33 markus 234: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 235: {
1.96 deraadt 236: u_char buf[32], mdbuf[16], session_id[16];
237: u_int response_type;
238: BIGNUM *challenge;
1.78 provos 239: Identity *id;
1.33 markus 240: int i, len;
1.21 markus 241: Buffer msg;
1.182 markus 242: struct ssh_digest_ctx *md;
1.96 deraadt 243: Key *key;
1.21 markus 244:
245: buffer_init(&msg);
1.39 markus 246: key = key_new(KEY_RSA1);
1.76 markus 247: if ((challenge = BN_new()) == NULL)
248: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 249:
1.97 markus 250: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 251: buffer_get_bignum(&e->request, key->rsa->e);
252: buffer_get_bignum(&e->request, key->rsa->n);
253: buffer_get_bignum(&e->request, challenge);
1.21 markus 254:
1.33 markus 255: /* Only protocol 1.1 is supported */
1.87 markus 256: if (buffer_len(&e->request) == 0)
1.33 markus 257: goto failure;
1.87 markus 258: buffer_get(&e->request, session_id, 16);
259: response_type = buffer_get_int(&e->request);
1.33 markus 260: if (response_type != 1)
261: goto failure;
262:
1.78 provos 263: id = lookup_identity(key, 1);
1.107 markus 264: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 265: Key *private = id->key;
1.33 markus 266: /* Decrypt the challenge using the private key. */
1.186 ! djm 267: if (rsa_private_decrypt(challenge, challenge, private->rsa) != 0)
1.49 markus 268: goto failure;
1.33 markus 269:
270: /* The response is MD5 of decrypted challenge plus session id. */
271: len = BN_num_bytes(challenge);
272: if (len <= 0 || len > 32) {
1.109 itojun 273: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 274: goto failure;
275: }
276: memset(buf, 0, 32);
277: BN_bn2bin(challenge, buf + 32 - len);
1.182 markus 278: if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
279: ssh_digest_update(md, buf, 32) < 0 ||
280: ssh_digest_update(md, session_id, 16) < 0 ||
281: ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
282: fatal("%s: md5 failed", __func__);
283: ssh_digest_free(md);
1.33 markus 284:
285: /* Send the response. */
286: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
287: for (i = 0; i < 16; i++)
288: buffer_put_char(&msg, mdbuf[i]);
289: goto send;
290: }
1.21 markus 291:
1.33 markus 292: failure:
293: /* Unknown identity or protocol error. Send failure. */
1.21 markus 294: buffer_put_char(&msg, SSH_AGENT_FAILURE);
295: send:
296: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 297: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
298: key_free(key);
299: BN_clear_free(challenge);
300: buffer_free(&msg);
301: }
1.185 markus 302: #endif
1.33 markus 303:
304: /* ssh2 only */
1.55 itojun 305: static void
1.33 markus 306: process_sign_request2(SocketEntry *e)
307: {
1.45 markus 308: u_char *blob, *data, *signature = NULL;
309: u_int blen, dlen, slen = 0;
1.96 deraadt 310: extern int datafellows;
1.159 djm 311: int odatafellows;
1.96 deraadt 312: int ok = -1, flags;
1.33 markus 313: Buffer msg;
1.96 deraadt 314: Key *key;
1.33 markus 315:
316: datafellows = 0;
1.43 markus 317:
1.87 markus 318: blob = buffer_get_string(&e->request, &blen);
319: data = buffer_get_string(&e->request, &dlen);
1.37 markus 320:
1.87 markus 321: flags = buffer_get_int(&e->request);
1.159 djm 322: odatafellows = datafellows;
1.37 markus 323: if (flags & SSH_AGENT_OLD_SIGNATURE)
324: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 325:
1.39 markus 326: key = key_from_blob(blob, blen);
1.33 markus 327: if (key != NULL) {
1.78 provos 328: Identity *id = lookup_identity(key, 2);
1.107 markus 329: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 330: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 331: key_free(key);
1.33 markus 332: }
333: buffer_init(&msg);
334: if (ok == 0) {
335: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
336: buffer_put_string(&msg, signature, slen);
337: } else {
338: buffer_put_char(&msg, SSH_AGENT_FAILURE);
339: }
340: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 341: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 342: buffer_len(&msg));
1.21 markus 343: buffer_free(&msg);
1.173 djm 344: free(data);
345: free(blob);
346: free(signature);
1.159 djm 347: datafellows = odatafellows;
1.1 deraadt 348: }
349:
1.33 markus 350: /* shared */
1.55 itojun 351: static void
1.33 markus 352: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 353: {
1.186 ! djm 354: u_int blen;
1.96 deraadt 355: int success = 0;
1.78 provos 356: Key *key = NULL;
1.45 markus 357: u_char *blob;
1.186 ! djm 358: #ifdef WITH_SSH1
! 359: u_int bits;
! 360: #endif /* WITH_SSH1 */
1.21 markus 361:
1.74 deraadt 362: switch (version) {
1.186 ! djm 363: #ifdef WITH_SSH1
1.33 markus 364: case 1:
1.39 markus 365: key = key_new(KEY_RSA1);
1.87 markus 366: bits = buffer_get_int(&e->request);
367: buffer_get_bignum(&e->request, key->rsa->e);
368: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 369:
370: if (bits != key_size(key))
1.109 itojun 371: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 372: key_size(key), bits);
1.33 markus 373: break;
1.186 ! djm 374: #endif /* WITH_SSH1 */
1.33 markus 375: case 2:
1.87 markus 376: blob = buffer_get_string(&e->request, &blen);
1.39 markus 377: key = key_from_blob(blob, blen);
1.173 djm 378: free(blob);
1.33 markus 379: break;
380: }
381: if (key != NULL) {
1.78 provos 382: Identity *id = lookup_identity(key, version);
383: if (id != NULL) {
1.23 markus 384: /*
385: * We have this key. Free the old key. Since we
1.124 djm 386: * don't want to leave empty slots in the middle of
1.40 markus 387: * the array, we actually free the key there and move
388: * all the entries between the empty slot and the end
389: * of the array.
1.23 markus 390: */
1.33 markus 391: Idtab *tab = idtab_lookup(version);
1.38 markus 392: if (tab->nentries < 1)
393: fatal("process_remove_identity: "
394: "internal error: tab->nentries %d",
395: tab->nentries);
1.78 provos 396: TAILQ_REMOVE(&tab->idlist, id, next);
397: free_identity(id);
1.33 markus 398: tab->nentries--;
399: success = 1;
1.21 markus 400: }
1.33 markus 401: key_free(key);
402: }
1.1 deraadt 403: buffer_put_int(&e->output, 1);
1.33 markus 404: buffer_put_char(&e->output,
405: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 406: }
407:
1.55 itojun 408: static void
1.33 markus 409: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 410: {
1.33 markus 411: Idtab *tab = idtab_lookup(version);
1.78 provos 412: Identity *id;
1.21 markus 413:
414: /* Loop over all identities and clear the keys. */
1.78 provos 415: for (id = TAILQ_FIRST(&tab->idlist); id;
416: id = TAILQ_FIRST(&tab->idlist)) {
417: TAILQ_REMOVE(&tab->idlist, id, next);
418: free_identity(id);
1.21 markus 419: }
420:
421: /* Mark that there are no identities. */
1.33 markus 422: tab->nentries = 0;
1.21 markus 423:
424: /* Send success. */
425: buffer_put_int(&e->output, 1);
426: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 427: }
428:
1.155 dtucker 429: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 430: static time_t
1.89 markus 431: reaper(void)
432: {
1.175 dtucker 433: time_t deadline = 0, now = monotime();
1.89 markus 434: Identity *id, *nxt;
435: int version;
1.96 deraadt 436: Idtab *tab;
1.89 markus 437:
438: for (version = 1; version < 3; version++) {
439: tab = idtab_lookup(version);
440: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
441: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 442: if (id->death == 0)
443: continue;
444: if (now >= id->death) {
1.154 dtucker 445: debug("expiring key '%s'", id->comment);
1.89 markus 446: TAILQ_REMOVE(&tab->idlist, id, next);
447: free_identity(id);
448: tab->nentries--;
1.155 dtucker 449: } else
450: deadline = (deadline == 0) ? id->death :
451: MIN(deadline, id->death);
1.89 markus 452: }
453: }
1.155 dtucker 454: if (deadline == 0 || deadline <= now)
455: return 0;
456: else
457: return (deadline - now);
1.89 markus 458: }
459:
460: static void
1.33 markus 461: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 462: {
1.96 deraadt 463: Idtab *tab = idtab_lookup(version);
1.157 canacar 464: Identity *id;
1.174 dtucker 465: int type, success = 0, confirm = 0;
1.178 markus 466: char *comment;
1.174 dtucker 467: time_t death = 0;
1.33 markus 468: Key *k = NULL;
469:
470: switch (version) {
1.186 ! djm 471: #ifdef WITH_SSH1
1.33 markus 472: case 1:
1.39 markus 473: k = key_new_private(KEY_RSA1);
1.97 markus 474: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 475: buffer_get_bignum(&e->request, k->rsa->n);
476: buffer_get_bignum(&e->request, k->rsa->e);
477: buffer_get_bignum(&e->request, k->rsa->d);
478: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 479:
480: /* SSH and SSL have p and q swapped */
1.87 markus 481: buffer_get_bignum(&e->request, k->rsa->q); /* p */
482: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 483:
484: /* Generate additional parameters */
1.186 ! djm 485: if (rsa_generate_additional_parameters(k->rsa) != 0)
! 486: fatal("%s: rsa_generate_additional_parameters "
! 487: "error", __func__);
1.178 markus 488:
1.180 markus 489: /* enable blinding */
1.178 markus 490: if (RSA_blinding_on(k->rsa, NULL) != 1) {
491: error("process_add_identity: RSA_blinding_on failed");
492: key_free(k);
493: goto send;
494: }
1.33 markus 495: break;
1.186 ! djm 496: #endif /* WITH_SSH1 */
1.33 markus 497: case 2:
1.178 markus 498: k = key_private_deserialize(&e->request);
499: if (k == NULL) {
1.87 markus 500: buffer_clear(&e->request);
1.33 markus 501: goto send;
1.21 markus 502: }
1.33 markus 503: break;
504: }
1.186 ! djm 505: if (k == NULL)
! 506: goto send;
1.87 markus 507: comment = buffer_get_string(&e->request, NULL);
1.186 ! djm 508:
1.94 markus 509: while (buffer_len(&e->request)) {
1.158 djm 510: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 511: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 512: death = monotime() + buffer_get_int(&e->request);
1.94 markus 513: break;
1.107 markus 514: case SSH_AGENT_CONSTRAIN_CONFIRM:
515: confirm = 1;
516: break;
1.94 markus 517: default:
1.158 djm 518: error("process_add_identity: "
519: "Unknown constraint type %d", type);
1.173 djm 520: free(comment);
1.158 djm 521: key_free(k);
522: goto send;
1.94 markus 523: }
524: }
1.158 djm 525: success = 1;
1.106 marc 526: if (lifetime && !death)
1.175 dtucker 527: death = monotime() + lifetime;
1.157 canacar 528: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 529: id = xcalloc(1, sizeof(Identity));
1.78 provos 530: id->key = k;
531: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 532: /* Increment the number of identities. */
533: tab->nentries++;
534: } else {
535: key_free(k);
1.173 djm 536: free(id->comment);
1.33 markus 537: }
1.157 canacar 538: id->comment = comment;
539: id->death = death;
540: id->confirm = confirm;
1.33 markus 541: send:
1.1 deraadt 542: buffer_put_int(&e->output, 1);
1.33 markus 543: buffer_put_char(&e->output,
544: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 545: }
546:
1.88 markus 547: /* XXX todo: encrypt sensitive data with passphrase */
548: static void
549: process_lock_agent(SocketEntry *e, int lock)
550: {
1.96 deraadt 551: int success = 0;
1.88 markus 552: char *passwd;
553:
554: passwd = buffer_get_string(&e->request, NULL);
555: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
556: locked = 0;
1.183 djm 557: explicit_bzero(lock_passwd, strlen(lock_passwd));
1.173 djm 558: free(lock_passwd);
1.88 markus 559: lock_passwd = NULL;
560: success = 1;
561: } else if (!locked && lock) {
562: locked = 1;
563: lock_passwd = xstrdup(passwd);
564: success = 1;
565: }
1.183 djm 566: explicit_bzero(passwd, strlen(passwd));
1.173 djm 567: free(passwd);
1.95 deraadt 568:
1.88 markus 569: buffer_put_int(&e->output, 1);
570: buffer_put_char(&e->output,
571: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
572: }
573:
574: static void
575: no_identities(SocketEntry *e, u_int type)
576: {
577: Buffer msg;
578:
579: buffer_init(&msg);
580: buffer_put_char(&msg,
581: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
582: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
583: buffer_put_int(&msg, 0);
584: buffer_put_int(&e->output, buffer_len(&msg));
585: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
586: buffer_free(&msg);
587: }
1.59 markus 588:
1.163 markus 589: #ifdef ENABLE_PKCS11
1.59 markus 590: static void
1.158 djm 591: process_add_smartcard_key(SocketEntry *e)
1.59 markus 592: {
1.163 markus 593: char *provider = NULL, *pin;
1.174 dtucker 594: int i, type, version, count = 0, success = 0, confirm = 0;
595: time_t death = 0;
1.163 markus 596: Key **keys = NULL, *k;
1.84 markus 597: Identity *id;
1.59 markus 598: Idtab *tab;
1.75 deraadt 599:
1.163 markus 600: provider = buffer_get_string(&e->request, NULL);
1.87 markus 601: pin = buffer_get_string(&e->request, NULL);
1.110 djm 602:
603: while (buffer_len(&e->request)) {
1.158 djm 604: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 605: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 606: death = monotime() + buffer_get_int(&e->request);
1.110 djm 607: break;
608: case SSH_AGENT_CONSTRAIN_CONFIRM:
609: confirm = 1;
610: break;
611: default:
1.158 djm 612: error("process_add_smartcard_key: "
613: "Unknown constraint type %d", type);
614: goto send;
1.110 djm 615: }
616: }
617: if (lifetime && !death)
1.175 dtucker 618: death = monotime() + lifetime;
1.110 djm 619:
1.163 markus 620: count = pkcs11_add_provider(provider, pin, &keys);
621: for (i = 0; i < count; i++) {
1.84 markus 622: k = keys[i];
623: version = k->type == KEY_RSA1 ? 1 : 2;
624: tab = idtab_lookup(version);
625: if (lookup_identity(k, version) == NULL) {
1.163 markus 626: id = xcalloc(1, sizeof(Identity));
1.84 markus 627: id->key = k;
1.163 markus 628: id->provider = xstrdup(provider);
629: id->comment = xstrdup(provider); /* XXX */
1.110 djm 630: id->death = death;
631: id->confirm = confirm;
1.84 markus 632: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
633: tab->nentries++;
634: success = 1;
635: } else {
636: key_free(k);
637: }
638: keys[i] = NULL;
1.59 markus 639: }
640: send:
1.173 djm 641: free(pin);
642: free(provider);
643: free(keys);
1.59 markus 644: buffer_put_int(&e->output, 1);
645: buffer_put_char(&e->output,
646: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
647: }
648:
649: static void
650: process_remove_smartcard_key(SocketEntry *e)
651: {
1.163 markus 652: char *provider = NULL, *pin = NULL;
653: int version, success = 0;
654: Identity *id, *nxt;
1.84 markus 655: Idtab *tab;
1.59 markus 656:
1.163 markus 657: provider = buffer_get_string(&e->request, NULL);
1.87 markus 658: pin = buffer_get_string(&e->request, NULL);
1.173 djm 659: free(pin);
1.59 markus 660:
1.163 markus 661: for (version = 1; version < 3; version++) {
662: tab = idtab_lookup(version);
663: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
664: nxt = TAILQ_NEXT(id, next);
1.181 djm 665: /* Skip file--based keys */
666: if (id->provider == NULL)
667: continue;
1.163 markus 668: if (!strcmp(provider, id->provider)) {
669: TAILQ_REMOVE(&tab->idlist, id, next);
670: free_identity(id);
671: tab->nentries--;
672: }
1.59 markus 673: }
674: }
1.163 markus 675: if (pkcs11_del_provider(provider) == 0)
676: success = 1;
677: else
678: error("process_remove_smartcard_key:"
679: " pkcs11_del_provider failed");
1.173 djm 680: free(provider);
1.59 markus 681: buffer_put_int(&e->output, 1);
682: buffer_put_char(&e->output,
683: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
684: }
1.163 markus 685: #endif /* ENABLE_PKCS11 */
1.59 markus 686:
1.33 markus 687: /* dispatch incoming messages */
688:
1.55 itojun 689: static void
1.2 provos 690: process_message(SocketEntry *e)
1.1 deraadt 691: {
1.96 deraadt 692: u_int msg_len, type;
1.45 markus 693: u_char *cp;
1.89 markus 694:
1.21 markus 695: if (buffer_len(&e->input) < 5)
696: return; /* Incomplete message. */
1.77 stevesk 697: cp = buffer_ptr(&e->input);
1.137 djm 698: msg_len = get_u32(cp);
1.21 markus 699: if (msg_len > 256 * 1024) {
1.101 stevesk 700: close_socket(e);
1.21 markus 701: return;
702: }
703: if (buffer_len(&e->input) < msg_len + 4)
704: return;
1.87 markus 705:
706: /* move the current input to e->request */
1.21 markus 707: buffer_consume(&e->input, 4);
1.87 markus 708: buffer_clear(&e->request);
709: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
710: buffer_consume(&e->input, msg_len);
711: type = buffer_get_char(&e->request);
1.21 markus 712:
1.88 markus 713: /* check wheter agent is locked */
714: if (locked && type != SSH_AGENTC_UNLOCK) {
715: buffer_clear(&e->request);
716: switch (type) {
717: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
718: case SSH2_AGENTC_REQUEST_IDENTITIES:
719: /* send empty lists */
720: no_identities(e, type);
721: break;
722: default:
723: /* send a fail message for all other request types */
724: buffer_put_int(&e->output, 1);
725: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
726: }
727: return;
728: }
729:
1.59 markus 730: debug("type %d", type);
1.21 markus 731: switch (type) {
1.88 markus 732: case SSH_AGENTC_LOCK:
733: case SSH_AGENTC_UNLOCK:
734: process_lock_agent(e, type == SSH_AGENTC_LOCK);
735: break;
1.185 markus 736: #ifdef WITH_SSH1
1.33 markus 737: /* ssh1 */
738: case SSH_AGENTC_RSA_CHALLENGE:
739: process_authentication_challenge1(e);
740: break;
1.21 markus 741: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 742: process_request_identities(e, 1);
1.21 markus 743: break;
744: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 745: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 746: process_add_identity(e, 1);
1.21 markus 747: break;
748: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 749: process_remove_identity(e, 1);
1.21 markus 750: break;
751: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 752: process_remove_all_identities(e, 1);
753: break;
1.185 markus 754: #endif
1.33 markus 755: /* ssh2 */
756: case SSH2_AGENTC_SIGN_REQUEST:
757: process_sign_request2(e);
758: break;
759: case SSH2_AGENTC_REQUEST_IDENTITIES:
760: process_request_identities(e, 2);
761: break;
762: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 763: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 764: process_add_identity(e, 2);
765: break;
766: case SSH2_AGENTC_REMOVE_IDENTITY:
767: process_remove_identity(e, 2);
768: break;
769: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
770: process_remove_all_identities(e, 2);
1.21 markus 771: break;
1.163 markus 772: #ifdef ENABLE_PKCS11
1.59 markus 773: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 774: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 775: process_add_smartcard_key(e);
1.75 deraadt 776: break;
1.59 markus 777: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
778: process_remove_smartcard_key(e);
1.75 deraadt 779: break;
1.163 markus 780: #endif /* ENABLE_PKCS11 */
1.21 markus 781: default:
782: /* Unknown message. Respond with failure. */
783: error("Unknown message %d", type);
1.87 markus 784: buffer_clear(&e->request);
1.21 markus 785: buffer_put_int(&e->output, 1);
786: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
787: break;
788: }
1.1 deraadt 789: }
790:
1.55 itojun 791: static void
1.73 stevesk 792: new_socket(sock_type type, int fd)
1.1 deraadt 793: {
1.112 markus 794: u_int i, old_alloc, new_alloc;
1.96 deraadt 795:
1.119 djm 796: set_nonblock(fd);
1.21 markus 797:
798: if (fd > max_fd)
799: max_fd = fd;
800:
801: for (i = 0; i < sockets_alloc; i++)
802: if (sockets[i].type == AUTH_UNUSED) {
803: sockets[i].fd = fd;
804: buffer_init(&sockets[i].input);
805: buffer_init(&sockets[i].output);
1.87 markus 806: buffer_init(&sockets[i].request);
1.112 markus 807: sockets[i].type = type;
1.21 markus 808: return;
809: }
810: old_alloc = sockets_alloc;
1.112 markus 811: new_alloc = sockets_alloc + 10;
1.133 djm 812: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 813: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 814: sockets[i].type = AUTH_UNUSED;
1.112 markus 815: sockets_alloc = new_alloc;
1.21 markus 816: sockets[old_alloc].fd = fd;
817: buffer_init(&sockets[old_alloc].input);
818: buffer_init(&sockets[old_alloc].output);
1.87 markus 819: buffer_init(&sockets[old_alloc].request);
1.112 markus 820: sockets[old_alloc].type = type;
1.1 deraadt 821: }
822:
1.55 itojun 823: static int
1.155 dtucker 824: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
825: struct timeval **tvpp)
1.1 deraadt 826: {
1.174 dtucker 827: u_int i, sz;
1.46 markus 828: int n = 0;
1.155 dtucker 829: static struct timeval tv;
1.174 dtucker 830: time_t deadline;
1.46 markus 831:
832: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 833: switch (sockets[i].type) {
834: case AUTH_SOCKET:
835: case AUTH_CONNECTION:
1.46 markus 836: n = MAX(n, sockets[i].fd);
1.21 markus 837: break;
838: case AUTH_UNUSED:
839: break;
840: default:
841: fatal("Unknown socket type %d", sockets[i].type);
842: break;
843: }
1.46 markus 844: }
845:
846: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 847: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 848: free(*fdrp);
849: free(*fdwp);
1.46 markus 850: *fdrp = xmalloc(sz);
851: *fdwp = xmalloc(sz);
1.66 markus 852: *nallocp = sz;
1.46 markus 853: }
1.66 markus 854: if (n < *fdl)
855: debug("XXX shrink: %d < %d", n, *fdl);
856: *fdl = n;
1.46 markus 857: memset(*fdrp, 0, sz);
858: memset(*fdwp, 0, sz);
859:
860: for (i = 0; i < sockets_alloc; i++) {
861: switch (sockets[i].type) {
862: case AUTH_SOCKET:
863: case AUTH_CONNECTION:
864: FD_SET(sockets[i].fd, *fdrp);
865: if (buffer_len(&sockets[i].output) > 0)
866: FD_SET(sockets[i].fd, *fdwp);
867: break;
868: default:
869: break;
870: }
871: }
1.155 dtucker 872: deadline = reaper();
873: if (parent_alive_interval != 0)
874: deadline = (deadline == 0) ? parent_alive_interval :
875: MIN(deadline, parent_alive_interval);
876: if (deadline == 0) {
877: *tvpp = NULL;
878: } else {
879: tv.tv_sec = deadline;
880: tv.tv_usec = 0;
881: *tvpp = &tv;
882: }
1.46 markus 883: return (1);
1.21 markus 884: }
885:
1.55 itojun 886: static void
1.21 markus 887: after_select(fd_set *readset, fd_set *writeset)
888: {
1.96 deraadt 889: struct sockaddr_un sunaddr;
1.26 markus 890: socklen_t slen;
1.21 markus 891: char buf[1024];
1.96 deraadt 892: int len, sock;
1.162 djm 893: u_int i, orig_alloc;
1.103 markus 894: uid_t euid;
895: gid_t egid;
1.21 markus 896:
1.162 djm 897: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 898: switch (sockets[i].type) {
899: case AUTH_UNUSED:
900: break;
901: case AUTH_SOCKET:
902: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 903: slen = sizeof(sunaddr);
1.46 markus 904: sock = accept(sockets[i].fd,
1.131 deraadt 905: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 906: if (sock < 0) {
1.81 stevesk 907: error("accept from AUTH_SOCKET: %s",
908: strerror(errno));
1.103 markus 909: break;
910: }
911: if (getpeereid(sock, &euid, &egid) < 0) {
912: error("getpeereid %d failed: %s",
913: sock, strerror(errno));
914: close(sock);
915: break;
916: }
1.105 markus 917: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 918: error("uid mismatch: "
1.104 stevesk 919: "peer euid %u != uid %u",
920: (u_int) euid, (u_int) getuid());
1.103 markus 921: close(sock);
1.21 markus 922: break;
923: }
924: new_socket(AUTH_CONNECTION, sock);
925: }
926: break;
927: case AUTH_CONNECTION:
928: if (buffer_len(&sockets[i].output) > 0 &&
929: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 930: len = write(sockets[i].fd,
931: buffer_ptr(&sockets[i].output),
932: buffer_len(&sockets[i].output));
933: if (len == -1 && (errno == EAGAIN ||
934: errno == EINTR))
935: continue;
1.21 markus 936: if (len <= 0) {
1.101 stevesk 937: close_socket(&sockets[i]);
1.21 markus 938: break;
939: }
940: buffer_consume(&sockets[i].output, len);
941: }
942: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 943: len = read(sockets[i].fd, buf, sizeof(buf));
944: if (len == -1 && (errno == EAGAIN ||
945: errno == EINTR))
946: continue;
1.21 markus 947: if (len <= 0) {
1.101 stevesk 948: close_socket(&sockets[i]);
1.21 markus 949: break;
950: }
951: buffer_append(&sockets[i].input, buf, len);
952: process_message(&sockets[i]);
953: }
954: break;
955: default:
956: fatal("Unknown type %d", sockets[i].type);
957: }
1.1 deraadt 958: }
959:
1.55 itojun 960: static void
1.113 markus 961: cleanup_socket(void)
1.15 markus 962: {
1.48 deraadt 963: if (socket_name[0])
964: unlink(socket_name);
965: if (socket_dir[0])
966: rmdir(socket_dir);
1.10 markus 967: }
968:
1.114 markus 969: void
1.15 markus 970: cleanup_exit(int i)
971: {
1.113 markus 972: cleanup_socket();
973: _exit(i);
1.15 markus 974: }
975:
1.135 deraadt 976: /*ARGSUSED*/
1.55 itojun 977: static void
1.48 deraadt 978: cleanup_handler(int sig)
979: {
1.113 markus 980: cleanup_socket();
1.163 markus 981: #ifdef ENABLE_PKCS11
982: pkcs11_terminate();
983: #endif
1.48 deraadt 984: _exit(2);
1.113 markus 985: }
986:
1.68 markus 987: static void
1.155 dtucker 988: check_parent_exists(void)
1.68 markus 989: {
1.172 dtucker 990: /*
991: * If our parent has exited then getppid() will return (pid_t)1,
992: * so testing for that should be safe.
993: */
994: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 995: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 996: cleanup_socket();
997: _exit(2);
1.68 markus 998: }
1.48 deraadt 999: }
1000:
1.55 itojun 1001: static void
1.50 itojun 1002: usage(void)
1.15 markus 1003: {
1.184 deraadt 1004: fprintf(stderr,
1005: "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-t life]\n"
1006: " [command [arg ...]]\n"
1007: " ssh-agent [-c | -s] -k\n");
1.21 markus 1008: exit(1);
1.15 markus 1009: }
1010:
1.2 provos 1011: int
1012: main(int ac, char **av)
1.1 deraadt 1013: {
1.107 markus 1014: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1015: int sock, fd, ch, result, saved_errno;
1.120 avsm 1016: u_int nalloc;
1.96 deraadt 1017: char *shell, *format, *pidstr, *agentsocket = NULL;
1018: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1019: struct sockaddr_un sunaddr;
1.41 markus 1020: struct rlimit rlim;
1.96 deraadt 1021: extern int optind;
1.98 stevesk 1022: extern char *optarg;
1.21 markus 1023: pid_t pid;
1.96 deraadt 1024: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1025: struct timeval *tvp = NULL;
1.161 tobias 1026: size_t len;
1.123 djm 1027:
1028: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1029: sanitise_stdfd();
1.99 markus 1030:
1031: /* drop */
1032: setegid(getgid());
1033: setgid(getgid());
1.53 markus 1034:
1.185 markus 1035: #ifdef WITH_OPENSSL
1.170 djm 1036: OpenSSL_add_all_algorithms();
1.185 markus 1037: #endif
1.21 markus 1038:
1.106 marc 1039: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1040: switch (ch) {
1041: case 'c':
1042: if (s_flag)
1043: usage();
1044: c_flag++;
1045: break;
1046: case 'k':
1047: k_flag++;
1048: break;
1049: case 's':
1050: if (c_flag)
1051: usage();
1052: s_flag++;
1053: break;
1.57 markus 1054: case 'd':
1055: if (d_flag)
1056: usage();
1057: d_flag++;
1058: break;
1.86 markus 1059: case 'a':
1060: agentsocket = optarg;
1.106 marc 1061: break;
1062: case 't':
1063: if ((lifetime = convtime(optarg)) == -1) {
1064: fprintf(stderr, "Invalid lifetime\n");
1065: usage();
1066: }
1.86 markus 1067: break;
1.21 markus 1068: default:
1069: usage();
1070: }
1071: }
1072: ac -= optind;
1073: av += optind;
1074:
1.57 markus 1075: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1076: usage();
1077:
1.85 markus 1078: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1079: shell = getenv("SHELL");
1.161 tobias 1080: if (shell != NULL && (len = strlen(shell)) > 2 &&
1081: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1082: c_flag = 1;
1083: }
1084: if (k_flag) {
1.136 deraadt 1085: const char *errstr = NULL;
1086:
1.21 markus 1087: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1088: if (pidstr == NULL) {
1089: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1090: SSH_AGENTPID_ENV_NAME);
1.21 markus 1091: exit(1);
1092: }
1.136 deraadt 1093: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1094: if (errstr) {
1095: fprintf(stderr,
1096: "%s=\"%s\", which is not a good PID: %s\n",
1097: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1098: exit(1);
1099: }
1100: if (kill(pid, SIGTERM) == -1) {
1101: perror("kill");
1102: exit(1);
1103: }
1104: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1105: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1106: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1107: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1108: exit(0);
1109: }
1110: parent_pid = getpid();
1111:
1.86 markus 1112: if (agentsocket == NULL) {
1113: /* Create private directory for agent socket */
1.171 djm 1114: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1115: if (mkdtemp(socket_dir) == NULL) {
1116: perror("mkdtemp: private socket dir");
1117: exit(1);
1118: }
1.91 mpech 1119: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1120: (long)parent_pid);
1.86 markus 1121: } else {
1122: /* Try to use specified agent socket */
1123: socket_dir[0] = '\0';
1124: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1125: }
1126:
1.23 markus 1127: /*
1128: * Create socket early so it will exist before command gets run from
1129: * the parent.
1130: */
1.21 markus 1131: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1132: if (sock < 0) {
1133: perror("socket");
1.121 djm 1134: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1135: cleanup_exit(1);
1136: }
1137: memset(&sunaddr, 0, sizeof(sunaddr));
1138: sunaddr.sun_family = AF_UNIX;
1139: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1140: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1141: perror("bind");
1.121 djm 1142: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1143: cleanup_exit(1);
1144: }
1.117 markus 1145: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1146: perror("listen");
1147: cleanup_exit(1);
1148: }
1.46 markus 1149:
1.23 markus 1150: /*
1151: * Fork, and have the parent execute the command, if any, or present
1152: * the socket data. The child continues as the authentication agent.
1153: */
1.57 markus 1154: if (d_flag) {
1155: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1156: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1157: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1158: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1159: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1160: goto skip;
1161: }
1.21 markus 1162: pid = fork();
1163: if (pid == -1) {
1164: perror("fork");
1.81 stevesk 1165: cleanup_exit(1);
1.21 markus 1166: }
1167: if (pid != 0) { /* Parent - execute the given command. */
1168: close(sock);
1.91 mpech 1169: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1170: if (ac == 0) {
1171: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1172: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1173: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1174: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1175: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1176: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1177: exit(0);
1178: }
1.36 deraadt 1179: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1180: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1181: perror("setenv");
1182: exit(1);
1183: }
1.21 markus 1184: execvp(av[0], av);
1185: perror(av[0]);
1186: exit(1);
1187: }
1.81 stevesk 1188: /* child */
1189: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1190:
1191: if (setsid() == -1) {
1.81 stevesk 1192: error("setsid: %s", strerror(errno));
1.67 stevesk 1193: cleanup_exit(1);
1194: }
1195:
1196: (void)chdir("/");
1.107 markus 1197: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1198: /* XXX might close listen socket */
1199: (void)dup2(fd, STDIN_FILENO);
1200: (void)dup2(fd, STDOUT_FILENO);
1201: (void)dup2(fd, STDERR_FILENO);
1202: if (fd > 2)
1203: close(fd);
1204: }
1.21 markus 1205:
1.41 markus 1206: /* deny core dumps, since memory contains unencrypted private keys */
1207: rlim.rlim_cur = rlim.rlim_max = 0;
1208: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1209: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1210: cleanup_exit(1);
1211: }
1.57 markus 1212:
1213: skip:
1.163 markus 1214:
1215: #ifdef ENABLE_PKCS11
1216: pkcs11_init(0);
1217: #endif
1.21 markus 1218: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1219: if (ac > 0)
1220: parent_alive_interval = 10;
1.33 markus 1221: idtab_init();
1.61 markus 1222: signal(SIGPIPE, SIG_IGN);
1.177 djm 1223: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1224: signal(SIGHUP, cleanup_handler);
1225: signal(SIGTERM, cleanup_handler);
1.66 markus 1226: nalloc = 0;
1227:
1.21 markus 1228: while (1) {
1.155 dtucker 1229: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1230: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1231: saved_errno = errno;
1.155 dtucker 1232: if (parent_alive_interval != 0)
1233: check_parent_exists();
1234: (void) reaper(); /* remove expired keys */
1.154 dtucker 1235: if (result < 0) {
1236: if (saved_errno == EINTR)
1.21 markus 1237: continue;
1.154 dtucker 1238: fatal("select: %s", strerror(saved_errno));
1239: } else if (result > 0)
1240: after_select(readsetp, writesetp);
1.15 markus 1241: }
1.21 markus 1242: /* NOTREACHED */
1.1 deraadt 1243: }
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