Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.127
1.1 deraadt 1: /*
1.22 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * The authentication agent program.
1.33 markus 6: *
1.35 deraadt 7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
12: *
1.56 markus 13: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.35 deraadt 14: *
15: * Redistribution and use in source and binary forms, with or without
16: * modification, are permitted provided that the following conditions
17: * are met:
18: * 1. Redistributions of source code must retain the above copyright
19: * notice, this list of conditions and the following disclaimer.
20: * 2. Redistributions in binary form must reproduce the above copyright
21: * notice, this list of conditions and the following disclaimer in the
22: * documentation and/or other materials provided with the distribution.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.22 deraadt 34: */
1.1 deraadt 35:
36: #include "includes.h"
1.127 ! stevesk 37: RCSID("$OpenBSD: ssh-agent.c,v 1.126 2006/02/08 12:15:27 stevesk Exp $");
1.125 stevesk 38:
1.78 provos 39: #include <sys/queue.h>
1.127 ! stevesk 40: #include <sys/resource.h>
1.126 stevesk 41:
42: #include <paths.h>
1.47 markus 43:
44: #include <openssl/evp.h>
45: #include <openssl/md5.h>
1.1 deraadt 46:
47: #include "ssh.h"
48: #include "rsa.h"
49: #include "buffer.h"
50: #include "bufaux.h"
51: #include "xmalloc.h"
52: #include "getput.h"
1.32 markus 53: #include "key.h"
54: #include "authfd.h"
1.37 markus 55: #include "compat.h"
1.47 markus 56: #include "log.h"
1.107 markus 57: #include "misc.h"
1.7 deraadt 58:
1.59 markus 59: #ifdef SMARTCARD
60: #include "scard.h"
1.71 jakob 61: #endif
1.59 markus 62:
1.73 stevesk 63: typedef enum {
64: AUTH_UNUSED,
65: AUTH_SOCKET,
66: AUTH_CONNECTION
67: } sock_type;
68:
1.21 markus 69: typedef struct {
70: int fd;
1.73 stevesk 71: sock_type type;
1.21 markus 72: Buffer input;
73: Buffer output;
1.87 markus 74: Buffer request;
1.1 deraadt 75: } SocketEntry;
76:
1.45 markus 77: u_int sockets_alloc = 0;
1.1 deraadt 78: SocketEntry *sockets = NULL;
79:
1.78 provos 80: typedef struct identity {
81: TAILQ_ENTRY(identity) next;
1.33 markus 82: Key *key;
1.21 markus 83: char *comment;
1.89 markus 84: u_int death;
1.107 markus 85: u_int confirm;
1.1 deraadt 86: } Identity;
87:
1.33 markus 88: typedef struct {
89: int nentries;
1.78 provos 90: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 91: } Idtab;
92:
93: /* private key table, one per protocol version */
94: Idtab idtable[3];
1.1 deraadt 95:
96: int max_fd = 0;
97:
1.11 markus 98: /* pid of shell == parent of agent */
1.29 deraadt 99: pid_t parent_pid = -1;
1.10 markus 100:
101: /* pathname and directory for AUTH_SOCKET */
102: char socket_name[1024];
103: char socket_dir[1024];
104:
1.88 markus 105: /* locking */
106: int locked = 0;
107: char *lock_passwd = NULL;
108:
1.20 markus 109: extern char *__progname;
110:
1.106 marc 111: /* Default lifetime (0 == forever) */
112: static int lifetime = 0;
113:
1.55 itojun 114: static void
1.101 stevesk 115: close_socket(SocketEntry *e)
116: {
117: close(e->fd);
118: e->fd = -1;
119: e->type = AUTH_UNUSED;
120: buffer_free(&e->input);
121: buffer_free(&e->output);
122: buffer_free(&e->request);
123: }
124:
125: static void
1.33 markus 126: idtab_init(void)
1.1 deraadt 127: {
1.33 markus 128: int i;
1.96 deraadt 129:
1.74 deraadt 130: for (i = 0; i <=2; i++) {
1.78 provos 131: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 132: idtable[i].nentries = 0;
133: }
134: }
135:
136: /* return private key table for requested protocol version */
1.55 itojun 137: static Idtab *
1.33 markus 138: idtab_lookup(int version)
139: {
140: if (version < 1 || version > 2)
141: fatal("internal error, bad protocol version %d", version);
142: return &idtable[version];
143: }
144:
1.89 markus 145: static void
146: free_identity(Identity *id)
147: {
148: key_free(id->key);
149: xfree(id->comment);
150: xfree(id);
151: }
152:
1.33 markus 153: /* return matching private key for given public key */
1.78 provos 154: static Identity *
155: lookup_identity(Key *key, int version)
1.33 markus 156: {
1.78 provos 157: Identity *id;
158:
1.33 markus 159: Idtab *tab = idtab_lookup(version);
1.78 provos 160: TAILQ_FOREACH(id, &tab->idlist, next) {
161: if (key_equal(key, id->key))
162: return (id);
1.33 markus 163: }
1.78 provos 164: return (NULL);
165: }
166:
1.107 markus 167: /* Check confirmation of keysign request */
168: static int
169: confirm_key(Identity *id)
170: {
1.122 djm 171: char *p;
1.107 markus 172: int ret = -1;
173:
174: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 175: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
176: id->comment, p))
177: ret = 0;
1.107 markus 178: xfree(p);
1.122 djm 179:
1.107 markus 180: return (ret);
181: }
182:
1.33 markus 183: /* send list of supported public keys to 'client' */
1.55 itojun 184: static void
1.33 markus 185: process_request_identities(SocketEntry *e, int version)
186: {
187: Idtab *tab = idtab_lookup(version);
1.96 deraadt 188: Identity *id;
1.21 markus 189: Buffer msg;
1.1 deraadt 190:
1.21 markus 191: buffer_init(&msg);
1.33 markus 192: buffer_put_char(&msg, (version == 1) ?
193: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
194: buffer_put_int(&msg, tab->nentries);
1.78 provos 195: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 196: if (id->key->type == KEY_RSA1) {
1.33 markus 197: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
198: buffer_put_bignum(&msg, id->key->rsa->e);
199: buffer_put_bignum(&msg, id->key->rsa->n);
200: } else {
1.45 markus 201: u_char *blob;
202: u_int blen;
1.39 markus 203: key_to_blob(id->key, &blob, &blen);
1.33 markus 204: buffer_put_string(&msg, blob, blen);
205: xfree(blob);
206: }
207: buffer_put_cstring(&msg, id->comment);
1.21 markus 208: }
209: buffer_put_int(&e->output, buffer_len(&msg));
210: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
211: buffer_free(&msg);
1.1 deraadt 212: }
213:
1.33 markus 214: /* ssh1 only */
1.55 itojun 215: static void
1.33 markus 216: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 217: {
1.96 deraadt 218: u_char buf[32], mdbuf[16], session_id[16];
219: u_int response_type;
220: BIGNUM *challenge;
1.78 provos 221: Identity *id;
1.33 markus 222: int i, len;
1.21 markus 223: Buffer msg;
224: MD5_CTX md;
1.96 deraadt 225: Key *key;
1.21 markus 226:
227: buffer_init(&msg);
1.39 markus 228: key = key_new(KEY_RSA1);
1.76 markus 229: if ((challenge = BN_new()) == NULL)
230: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 231:
1.97 markus 232: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 233: buffer_get_bignum(&e->request, key->rsa->e);
234: buffer_get_bignum(&e->request, key->rsa->n);
235: buffer_get_bignum(&e->request, challenge);
1.21 markus 236:
1.33 markus 237: /* Only protocol 1.1 is supported */
1.87 markus 238: if (buffer_len(&e->request) == 0)
1.33 markus 239: goto failure;
1.87 markus 240: buffer_get(&e->request, session_id, 16);
241: response_type = buffer_get_int(&e->request);
1.33 markus 242: if (response_type != 1)
243: goto failure;
244:
1.78 provos 245: id = lookup_identity(key, 1);
1.107 markus 246: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 247: Key *private = id->key;
1.33 markus 248: /* Decrypt the challenge using the private key. */
1.49 markus 249: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
250: goto failure;
1.33 markus 251:
252: /* The response is MD5 of decrypted challenge plus session id. */
253: len = BN_num_bytes(challenge);
254: if (len <= 0 || len > 32) {
1.109 itojun 255: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 256: goto failure;
257: }
258: memset(buf, 0, 32);
259: BN_bn2bin(challenge, buf + 32 - len);
260: MD5_Init(&md);
261: MD5_Update(&md, buf, 32);
262: MD5_Update(&md, session_id, 16);
263: MD5_Final(mdbuf, &md);
264:
265: /* Send the response. */
266: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
267: for (i = 0; i < 16; i++)
268: buffer_put_char(&msg, mdbuf[i]);
269: goto send;
270: }
1.21 markus 271:
1.33 markus 272: failure:
273: /* Unknown identity or protocol error. Send failure. */
1.21 markus 274: buffer_put_char(&msg, SSH_AGENT_FAILURE);
275: send:
276: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 277: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
278: key_free(key);
279: BN_clear_free(challenge);
280: buffer_free(&msg);
281: }
282:
283: /* ssh2 only */
1.55 itojun 284: static void
1.33 markus 285: process_sign_request2(SocketEntry *e)
286: {
1.45 markus 287: u_char *blob, *data, *signature = NULL;
288: u_int blen, dlen, slen = 0;
1.96 deraadt 289: extern int datafellows;
290: int ok = -1, flags;
1.33 markus 291: Buffer msg;
1.96 deraadt 292: Key *key;
1.33 markus 293:
294: datafellows = 0;
1.43 markus 295:
1.87 markus 296: blob = buffer_get_string(&e->request, &blen);
297: data = buffer_get_string(&e->request, &dlen);
1.37 markus 298:
1.87 markus 299: flags = buffer_get_int(&e->request);
1.37 markus 300: if (flags & SSH_AGENT_OLD_SIGNATURE)
301: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 302:
1.39 markus 303: key = key_from_blob(blob, blen);
1.33 markus 304: if (key != NULL) {
1.78 provos 305: Identity *id = lookup_identity(key, 2);
1.107 markus 306: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 307: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.33 markus 308: }
309: key_free(key);
310: buffer_init(&msg);
311: if (ok == 0) {
312: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
313: buffer_put_string(&msg, signature, slen);
314: } else {
315: buffer_put_char(&msg, SSH_AGENT_FAILURE);
316: }
317: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 318: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 319: buffer_len(&msg));
1.21 markus 320: buffer_free(&msg);
1.33 markus 321: xfree(data);
322: xfree(blob);
323: if (signature != NULL)
324: xfree(signature);
1.1 deraadt 325: }
326:
1.33 markus 327: /* shared */
1.55 itojun 328: static void
1.33 markus 329: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 330: {
1.96 deraadt 331: u_int blen, bits;
332: int success = 0;
1.78 provos 333: Key *key = NULL;
1.45 markus 334: u_char *blob;
1.21 markus 335:
1.74 deraadt 336: switch (version) {
1.33 markus 337: case 1:
1.39 markus 338: key = key_new(KEY_RSA1);
1.87 markus 339: bits = buffer_get_int(&e->request);
340: buffer_get_bignum(&e->request, key->rsa->e);
341: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 342:
343: if (bits != key_size(key))
1.109 itojun 344: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 345: key_size(key), bits);
1.33 markus 346: break;
347: case 2:
1.87 markus 348: blob = buffer_get_string(&e->request, &blen);
1.39 markus 349: key = key_from_blob(blob, blen);
1.33 markus 350: xfree(blob);
351: break;
352: }
353: if (key != NULL) {
1.78 provos 354: Identity *id = lookup_identity(key, version);
355: if (id != NULL) {
1.23 markus 356: /*
357: * We have this key. Free the old key. Since we
1.124 djm 358: * don't want to leave empty slots in the middle of
1.40 markus 359: * the array, we actually free the key there and move
360: * all the entries between the empty slot and the end
361: * of the array.
1.23 markus 362: */
1.33 markus 363: Idtab *tab = idtab_lookup(version);
1.38 markus 364: if (tab->nentries < 1)
365: fatal("process_remove_identity: "
366: "internal error: tab->nentries %d",
367: tab->nentries);
1.78 provos 368: TAILQ_REMOVE(&tab->idlist, id, next);
369: free_identity(id);
1.33 markus 370: tab->nentries--;
371: success = 1;
1.21 markus 372: }
1.33 markus 373: key_free(key);
374: }
1.1 deraadt 375: buffer_put_int(&e->output, 1);
1.33 markus 376: buffer_put_char(&e->output,
377: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 378: }
379:
1.55 itojun 380: static void
1.33 markus 381: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 382: {
1.33 markus 383: Idtab *tab = idtab_lookup(version);
1.78 provos 384: Identity *id;
1.21 markus 385:
386: /* Loop over all identities and clear the keys. */
1.78 provos 387: for (id = TAILQ_FIRST(&tab->idlist); id;
388: id = TAILQ_FIRST(&tab->idlist)) {
389: TAILQ_REMOVE(&tab->idlist, id, next);
390: free_identity(id);
1.21 markus 391: }
392:
393: /* Mark that there are no identities. */
1.33 markus 394: tab->nentries = 0;
1.21 markus 395:
396: /* Send success. */
397: buffer_put_int(&e->output, 1);
398: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 399: }
400:
1.55 itojun 401: static void
1.89 markus 402: reaper(void)
403: {
1.96 deraadt 404: u_int now = time(NULL);
1.89 markus 405: Identity *id, *nxt;
406: int version;
1.96 deraadt 407: Idtab *tab;
1.89 markus 408:
409: for (version = 1; version < 3; version++) {
410: tab = idtab_lookup(version);
411: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
412: nxt = TAILQ_NEXT(id, next);
413: if (id->death != 0 && now >= id->death) {
414: TAILQ_REMOVE(&tab->idlist, id, next);
415: free_identity(id);
416: tab->nentries--;
417: }
418: }
419: }
420: }
421:
422: static void
1.33 markus 423: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 424: {
1.96 deraadt 425: Idtab *tab = idtab_lookup(version);
1.107 markus 426: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 427: char *type_name, *comment;
1.33 markus 428: Key *k = NULL;
429:
430: switch (version) {
431: case 1:
1.39 markus 432: k = key_new_private(KEY_RSA1);
1.97 markus 433: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 434: buffer_get_bignum(&e->request, k->rsa->n);
435: buffer_get_bignum(&e->request, k->rsa->e);
436: buffer_get_bignum(&e->request, k->rsa->d);
437: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 438:
439: /* SSH and SSL have p and q swapped */
1.87 markus 440: buffer_get_bignum(&e->request, k->rsa->q); /* p */
441: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 442:
443: /* Generate additional parameters */
1.60 markus 444: rsa_generate_additional_parameters(k->rsa);
1.33 markus 445: break;
446: case 2:
1.87 markus 447: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 448: type = key_type_from_name(type_name);
1.39 markus 449: xfree(type_name);
1.74 deraadt 450: switch (type) {
1.39 markus 451: case KEY_DSA:
452: k = key_new_private(type);
1.87 markus 453: buffer_get_bignum2(&e->request, k->dsa->p);
454: buffer_get_bignum2(&e->request, k->dsa->q);
455: buffer_get_bignum2(&e->request, k->dsa->g);
456: buffer_get_bignum2(&e->request, k->dsa->pub_key);
457: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 458: break;
459: case KEY_RSA:
460: k = key_new_private(type);
1.87 markus 461: buffer_get_bignum2(&e->request, k->rsa->n);
462: buffer_get_bignum2(&e->request, k->rsa->e);
463: buffer_get_bignum2(&e->request, k->rsa->d);
464: buffer_get_bignum2(&e->request, k->rsa->iqmp);
465: buffer_get_bignum2(&e->request, k->rsa->p);
466: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 467:
468: /* Generate additional parameters */
1.60 markus 469: rsa_generate_additional_parameters(k->rsa);
1.39 markus 470: break;
471: default:
1.87 markus 472: buffer_clear(&e->request);
1.108 markus 473: goto send;
474: }
475: break;
476: }
477: /* enable blinding */
478: switch (k->type) {
479: case KEY_RSA:
480: case KEY_RSA1:
481: if (RSA_blinding_on(k->rsa, NULL) != 1) {
482: error("process_add_identity: RSA_blinding_on failed");
483: key_free(k);
1.33 markus 484: goto send;
1.21 markus 485: }
1.33 markus 486: break;
487: }
1.87 markus 488: comment = buffer_get_string(&e->request, NULL);
1.33 markus 489: if (k == NULL) {
490: xfree(comment);
491: goto send;
492: }
493: success = 1;
1.94 markus 494: while (buffer_len(&e->request)) {
495: switch (buffer_get_char(&e->request)) {
496: case SSH_AGENT_CONSTRAIN_LIFETIME:
497: death = time(NULL) + buffer_get_int(&e->request);
498: break;
1.107 markus 499: case SSH_AGENT_CONSTRAIN_CONFIRM:
500: confirm = 1;
501: break;
1.94 markus 502: default:
503: break;
504: }
505: }
1.106 marc 506: if (lifetime && !death)
507: death = time(NULL) + lifetime;
1.78 provos 508: if (lookup_identity(k, version) == NULL) {
509: Identity *id = xmalloc(sizeof(Identity));
510: id->key = k;
511: id->comment = comment;
1.94 markus 512: id->death = death;
1.107 markus 513: id->confirm = confirm;
1.78 provos 514: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 515: /* Increment the number of identities. */
516: tab->nentries++;
517: } else {
518: key_free(k);
519: xfree(comment);
520: }
521: send:
1.1 deraadt 522: buffer_put_int(&e->output, 1);
1.33 markus 523: buffer_put_char(&e->output,
524: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 525: }
526:
1.88 markus 527: /* XXX todo: encrypt sensitive data with passphrase */
528: static void
529: process_lock_agent(SocketEntry *e, int lock)
530: {
1.96 deraadt 531: int success = 0;
1.88 markus 532: char *passwd;
533:
534: passwd = buffer_get_string(&e->request, NULL);
535: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
536: locked = 0;
537: memset(lock_passwd, 0, strlen(lock_passwd));
538: xfree(lock_passwd);
539: lock_passwd = NULL;
540: success = 1;
541: } else if (!locked && lock) {
542: locked = 1;
543: lock_passwd = xstrdup(passwd);
544: success = 1;
545: }
546: memset(passwd, 0, strlen(passwd));
547: xfree(passwd);
1.95 deraadt 548:
1.88 markus 549: buffer_put_int(&e->output, 1);
550: buffer_put_char(&e->output,
551: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
552: }
553:
554: static void
555: no_identities(SocketEntry *e, u_int type)
556: {
557: Buffer msg;
558:
559: buffer_init(&msg);
560: buffer_put_char(&msg,
561: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
562: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
563: buffer_put_int(&msg, 0);
564: buffer_put_int(&e->output, buffer_len(&msg));
565: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
566: buffer_free(&msg);
567: }
1.59 markus 568:
569: #ifdef SMARTCARD
570: static void
571: process_add_smartcard_key (SocketEntry *e)
572: {
1.96 deraadt 573: char *sc_reader_id = NULL, *pin;
1.110 djm 574: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 575: Key **keys, *k;
1.84 markus 576: Identity *id;
1.59 markus 577: Idtab *tab;
1.75 deraadt 578:
1.87 markus 579: sc_reader_id = buffer_get_string(&e->request, NULL);
580: pin = buffer_get_string(&e->request, NULL);
1.110 djm 581:
582: while (buffer_len(&e->request)) {
583: switch (buffer_get_char(&e->request)) {
584: case SSH_AGENT_CONSTRAIN_LIFETIME:
585: death = time(NULL) + buffer_get_int(&e->request);
586: break;
587: case SSH_AGENT_CONSTRAIN_CONFIRM:
588: confirm = 1;
589: break;
590: default:
591: break;
592: }
593: }
594: if (lifetime && !death)
595: death = time(NULL) + lifetime;
596:
1.84 markus 597: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 598: xfree(sc_reader_id);
1.83 rees 599: xfree(pin);
1.59 markus 600:
1.84 markus 601: if (keys == NULL || keys[0] == NULL) {
602: error("sc_get_keys failed");
1.59 markus 603: goto send;
604: }
1.84 markus 605: for (i = 0; keys[i] != NULL; i++) {
606: k = keys[i];
607: version = k->type == KEY_RSA1 ? 1 : 2;
608: tab = idtab_lookup(version);
609: if (lookup_identity(k, version) == NULL) {
610: id = xmalloc(sizeof(Identity));
611: id->key = k;
1.111 markus 612: id->comment = sc_get_key_label(k);
1.110 djm 613: id->death = death;
614: id->confirm = confirm;
1.84 markus 615: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
616: tab->nentries++;
617: success = 1;
618: } else {
619: key_free(k);
620: }
621: keys[i] = NULL;
1.59 markus 622: }
1.84 markus 623: xfree(keys);
1.59 markus 624: send:
625: buffer_put_int(&e->output, 1);
626: buffer_put_char(&e->output,
627: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
628: }
629:
630: static void
631: process_remove_smartcard_key(SocketEntry *e)
632: {
1.96 deraadt 633: char *sc_reader_id = NULL, *pin;
634: int i, version, success = 0;
635: Key **keys, *k = NULL;
1.84 markus 636: Identity *id;
637: Idtab *tab;
1.59 markus 638:
1.87 markus 639: sc_reader_id = buffer_get_string(&e->request, NULL);
640: pin = buffer_get_string(&e->request, NULL);
1.84 markus 641: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 642: xfree(sc_reader_id);
1.83 rees 643: xfree(pin);
1.59 markus 644:
1.84 markus 645: if (keys == NULL || keys[0] == NULL) {
646: error("sc_get_keys failed");
647: goto send;
648: }
649: for (i = 0; keys[i] != NULL; i++) {
650: k = keys[i];
651: version = k->type == KEY_RSA1 ? 1 : 2;
652: if ((id = lookup_identity(k, version)) != NULL) {
653: tab = idtab_lookup(version);
1.90 markus 654: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 655: tab->nentries--;
1.78 provos 656: free_identity(id);
1.59 markus 657: success = 1;
658: }
659: key_free(k);
1.84 markus 660: keys[i] = NULL;
1.59 markus 661: }
1.84 markus 662: xfree(keys);
663: send:
1.59 markus 664: buffer_put_int(&e->output, 1);
665: buffer_put_char(&e->output,
666: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
667: }
1.70 jakob 668: #endif /* SMARTCARD */
1.59 markus 669:
1.33 markus 670: /* dispatch incoming messages */
671:
1.55 itojun 672: static void
1.2 provos 673: process_message(SocketEntry *e)
1.1 deraadt 674: {
1.96 deraadt 675: u_int msg_len, type;
1.45 markus 676: u_char *cp;
1.89 markus 677:
678: /* kill dead keys */
679: reaper();
680:
1.21 markus 681: if (buffer_len(&e->input) < 5)
682: return; /* Incomplete message. */
1.77 stevesk 683: cp = buffer_ptr(&e->input);
1.21 markus 684: msg_len = GET_32BIT(cp);
685: if (msg_len > 256 * 1024) {
1.101 stevesk 686: close_socket(e);
1.21 markus 687: return;
688: }
689: if (buffer_len(&e->input) < msg_len + 4)
690: return;
1.87 markus 691:
692: /* move the current input to e->request */
1.21 markus 693: buffer_consume(&e->input, 4);
1.87 markus 694: buffer_clear(&e->request);
695: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
696: buffer_consume(&e->input, msg_len);
697: type = buffer_get_char(&e->request);
1.21 markus 698:
1.88 markus 699: /* check wheter agent is locked */
700: if (locked && type != SSH_AGENTC_UNLOCK) {
701: buffer_clear(&e->request);
702: switch (type) {
703: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
704: case SSH2_AGENTC_REQUEST_IDENTITIES:
705: /* send empty lists */
706: no_identities(e, type);
707: break;
708: default:
709: /* send a fail message for all other request types */
710: buffer_put_int(&e->output, 1);
711: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
712: }
713: return;
714: }
715:
1.59 markus 716: debug("type %d", type);
1.21 markus 717: switch (type) {
1.88 markus 718: case SSH_AGENTC_LOCK:
719: case SSH_AGENTC_UNLOCK:
720: process_lock_agent(e, type == SSH_AGENTC_LOCK);
721: break;
1.33 markus 722: /* ssh1 */
723: case SSH_AGENTC_RSA_CHALLENGE:
724: process_authentication_challenge1(e);
725: break;
1.21 markus 726: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 727: process_request_identities(e, 1);
1.21 markus 728: break;
729: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 730: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 731: process_add_identity(e, 1);
1.21 markus 732: break;
733: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 734: process_remove_identity(e, 1);
1.21 markus 735: break;
736: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 737: process_remove_all_identities(e, 1);
738: break;
739: /* ssh2 */
740: case SSH2_AGENTC_SIGN_REQUEST:
741: process_sign_request2(e);
742: break;
743: case SSH2_AGENTC_REQUEST_IDENTITIES:
744: process_request_identities(e, 2);
745: break;
746: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 747: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 748: process_add_identity(e, 2);
749: break;
750: case SSH2_AGENTC_REMOVE_IDENTITY:
751: process_remove_identity(e, 2);
752: break;
753: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
754: process_remove_all_identities(e, 2);
1.21 markus 755: break;
1.59 markus 756: #ifdef SMARTCARD
757: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 758: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 759: process_add_smartcard_key(e);
1.75 deraadt 760: break;
1.59 markus 761: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
762: process_remove_smartcard_key(e);
1.75 deraadt 763: break;
1.70 jakob 764: #endif /* SMARTCARD */
1.21 markus 765: default:
766: /* Unknown message. Respond with failure. */
767: error("Unknown message %d", type);
1.87 markus 768: buffer_clear(&e->request);
1.21 markus 769: buffer_put_int(&e->output, 1);
770: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
771: break;
772: }
1.1 deraadt 773: }
774:
1.55 itojun 775: static void
1.73 stevesk 776: new_socket(sock_type type, int fd)
1.1 deraadt 777: {
1.112 markus 778: u_int i, old_alloc, new_alloc;
1.96 deraadt 779:
1.119 djm 780: set_nonblock(fd);
1.21 markus 781:
782: if (fd > max_fd)
783: max_fd = fd;
784:
785: for (i = 0; i < sockets_alloc; i++)
786: if (sockets[i].type == AUTH_UNUSED) {
787: sockets[i].fd = fd;
788: buffer_init(&sockets[i].input);
789: buffer_init(&sockets[i].output);
1.87 markus 790: buffer_init(&sockets[i].request);
1.112 markus 791: sockets[i].type = type;
1.21 markus 792: return;
793: }
794: old_alloc = sockets_alloc;
1.112 markus 795: new_alloc = sockets_alloc + 10;
1.21 markus 796: if (sockets)
1.112 markus 797: sockets = xrealloc(sockets, new_alloc * sizeof(sockets[0]));
1.21 markus 798: else
1.112 markus 799: sockets = xmalloc(new_alloc * sizeof(sockets[0]));
800: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 801: sockets[i].type = AUTH_UNUSED;
1.112 markus 802: sockets_alloc = new_alloc;
1.21 markus 803: sockets[old_alloc].fd = fd;
804: buffer_init(&sockets[old_alloc].input);
805: buffer_init(&sockets[old_alloc].output);
1.87 markus 806: buffer_init(&sockets[old_alloc].request);
1.112 markus 807: sockets[old_alloc].type = type;
1.1 deraadt 808: }
809:
1.55 itojun 810: static int
1.120 avsm 811: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 812: {
1.46 markus 813: u_int i, sz;
814: int n = 0;
815:
816: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 817: switch (sockets[i].type) {
818: case AUTH_SOCKET:
819: case AUTH_CONNECTION:
1.46 markus 820: n = MAX(n, sockets[i].fd);
1.21 markus 821: break;
822: case AUTH_UNUSED:
823: break;
824: default:
825: fatal("Unknown socket type %d", sockets[i].type);
826: break;
827: }
1.46 markus 828: }
829:
830: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 831: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 832: if (*fdrp)
1.54 stevesk 833: xfree(*fdrp);
1.46 markus 834: if (*fdwp)
1.54 stevesk 835: xfree(*fdwp);
1.46 markus 836: *fdrp = xmalloc(sz);
837: *fdwp = xmalloc(sz);
1.66 markus 838: *nallocp = sz;
1.46 markus 839: }
1.66 markus 840: if (n < *fdl)
841: debug("XXX shrink: %d < %d", n, *fdl);
842: *fdl = n;
1.46 markus 843: memset(*fdrp, 0, sz);
844: memset(*fdwp, 0, sz);
845:
846: for (i = 0; i < sockets_alloc; i++) {
847: switch (sockets[i].type) {
848: case AUTH_SOCKET:
849: case AUTH_CONNECTION:
850: FD_SET(sockets[i].fd, *fdrp);
851: if (buffer_len(&sockets[i].output) > 0)
852: FD_SET(sockets[i].fd, *fdwp);
853: break;
854: default:
855: break;
856: }
857: }
858: return (1);
1.21 markus 859: }
860:
1.55 itojun 861: static void
1.21 markus 862: after_select(fd_set *readset, fd_set *writeset)
863: {
1.96 deraadt 864: struct sockaddr_un sunaddr;
1.26 markus 865: socklen_t slen;
1.21 markus 866: char buf[1024];
1.96 deraadt 867: int len, sock;
868: u_int i;
1.103 markus 869: uid_t euid;
870: gid_t egid;
1.21 markus 871:
872: for (i = 0; i < sockets_alloc; i++)
873: switch (sockets[i].type) {
874: case AUTH_UNUSED:
875: break;
876: case AUTH_SOCKET:
877: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 878: slen = sizeof(sunaddr);
1.46 markus 879: sock = accept(sockets[i].fd,
880: (struct sockaddr *) &sunaddr, &slen);
1.21 markus 881: if (sock < 0) {
1.81 stevesk 882: error("accept from AUTH_SOCKET: %s",
883: strerror(errno));
1.103 markus 884: break;
885: }
886: if (getpeereid(sock, &euid, &egid) < 0) {
887: error("getpeereid %d failed: %s",
888: sock, strerror(errno));
889: close(sock);
890: break;
891: }
1.105 markus 892: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 893: error("uid mismatch: "
1.104 stevesk 894: "peer euid %u != uid %u",
895: (u_int) euid, (u_int) getuid());
1.103 markus 896: close(sock);
1.21 markus 897: break;
898: }
899: new_socket(AUTH_CONNECTION, sock);
900: }
901: break;
902: case AUTH_CONNECTION:
903: if (buffer_len(&sockets[i].output) > 0 &&
904: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 905: do {
906: len = write(sockets[i].fd,
907: buffer_ptr(&sockets[i].output),
908: buffer_len(&sockets[i].output));
909: if (len == -1 && (errno == EAGAIN ||
910: errno == EINTR))
911: continue;
912: break;
913: } while (1);
1.21 markus 914: if (len <= 0) {
1.101 stevesk 915: close_socket(&sockets[i]);
1.21 markus 916: break;
917: }
918: buffer_consume(&sockets[i].output, len);
919: }
920: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 921: do {
922: len = read(sockets[i].fd, buf, sizeof(buf));
923: if (len == -1 && (errno == EAGAIN ||
924: errno == EINTR))
925: continue;
926: break;
927: } while (1);
1.21 markus 928: if (len <= 0) {
1.101 stevesk 929: close_socket(&sockets[i]);
1.21 markus 930: break;
931: }
932: buffer_append(&sockets[i].input, buf, len);
933: process_message(&sockets[i]);
934: }
935: break;
936: default:
937: fatal("Unknown type %d", sockets[i].type);
938: }
1.1 deraadt 939: }
940:
1.55 itojun 941: static void
1.113 markus 942: cleanup_socket(void)
1.15 markus 943: {
1.48 deraadt 944: if (socket_name[0])
945: unlink(socket_name);
946: if (socket_dir[0])
947: rmdir(socket_dir);
1.10 markus 948: }
949:
1.114 markus 950: void
1.15 markus 951: cleanup_exit(int i)
952: {
1.113 markus 953: cleanup_socket();
954: _exit(i);
1.15 markus 955: }
956:
1.55 itojun 957: static void
1.48 deraadt 958: cleanup_handler(int sig)
959: {
1.113 markus 960: cleanup_socket();
1.48 deraadt 961: _exit(2);
1.113 markus 962: }
963:
1.68 markus 964: static void
965: check_parent_exists(int sig)
966: {
967: int save_errno = errno;
968:
969: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
970: /* printf("Parent has died - Authentication agent exiting.\n"); */
971: cleanup_handler(sig); /* safe */
972: }
973: signal(SIGALRM, check_parent_exists);
974: alarm(10);
975: errno = save_errno;
1.48 deraadt 976: }
977:
1.55 itojun 978: static void
1.50 itojun 979: usage(void)
1.15 markus 980: {
1.72 jakob 981: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 982: __progname);
1.72 jakob 983: fprintf(stderr, "Options:\n");
984: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
985: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
986: fprintf(stderr, " -k Kill the current agent.\n");
987: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 988: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 989: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 990: exit(1);
1.15 markus 991: }
992:
1.2 provos 993: int
994: main(int ac, char **av)
1.1 deraadt 995: {
1.107 markus 996: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.120 avsm 997: int sock, fd, ch;
998: u_int nalloc;
1.96 deraadt 999: char *shell, *format, *pidstr, *agentsocket = NULL;
1000: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1001: struct sockaddr_un sunaddr;
1.41 markus 1002: struct rlimit rlim;
1.96 deraadt 1003: extern int optind;
1.98 stevesk 1004: extern char *optarg;
1.21 markus 1005: pid_t pid;
1.96 deraadt 1006: char pidstrbuf[1 + 3 * sizeof pid];
1.123 djm 1007:
1008: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1009: sanitise_stdfd();
1.99 markus 1010:
1011: /* drop */
1012: setegid(getgid());
1013: setgid(getgid());
1.53 markus 1014:
1015: SSLeay_add_all_algorithms();
1.21 markus 1016:
1.106 marc 1017: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1018: switch (ch) {
1019: case 'c':
1020: if (s_flag)
1021: usage();
1022: c_flag++;
1023: break;
1024: case 'k':
1025: k_flag++;
1026: break;
1027: case 's':
1028: if (c_flag)
1029: usage();
1030: s_flag++;
1031: break;
1.57 markus 1032: case 'd':
1033: if (d_flag)
1034: usage();
1035: d_flag++;
1036: break;
1.86 markus 1037: case 'a':
1038: agentsocket = optarg;
1.106 marc 1039: break;
1040: case 't':
1041: if ((lifetime = convtime(optarg)) == -1) {
1042: fprintf(stderr, "Invalid lifetime\n");
1043: usage();
1044: }
1.86 markus 1045: break;
1.21 markus 1046: default:
1047: usage();
1048: }
1049: }
1050: ac -= optind;
1051: av += optind;
1052:
1.57 markus 1053: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1054: usage();
1055:
1.85 markus 1056: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1057: shell = getenv("SHELL");
1058: if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1059: c_flag = 1;
1060: }
1061: if (k_flag) {
1062: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1063: if (pidstr == NULL) {
1064: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1065: SSH_AGENTPID_ENV_NAME);
1.21 markus 1066: exit(1);
1067: }
1068: pid = atoi(pidstr);
1.46 markus 1069: if (pid < 1) {
1.21 markus 1070: fprintf(stderr, "%s=\"%s\", which is not a good PID\n",
1.46 markus 1071: SSH_AGENTPID_ENV_NAME, pidstr);
1.21 markus 1072: exit(1);
1073: }
1074: if (kill(pid, SIGTERM) == -1) {
1075: perror("kill");
1076: exit(1);
1077: }
1078: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1079: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1080: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1081: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1082: exit(0);
1083: }
1084: parent_pid = getpid();
1085:
1.86 markus 1086: if (agentsocket == NULL) {
1087: /* Create private directory for agent socket */
1.115 markus 1088: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1089: if (mkdtemp(socket_dir) == NULL) {
1090: perror("mkdtemp: private socket dir");
1091: exit(1);
1092: }
1.91 mpech 1093: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1094: (long)parent_pid);
1.86 markus 1095: } else {
1096: /* Try to use specified agent socket */
1097: socket_dir[0] = '\0';
1098: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1099: }
1100:
1.23 markus 1101: /*
1102: * Create socket early so it will exist before command gets run from
1103: * the parent.
1104: */
1.21 markus 1105: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1106: if (sock < 0) {
1107: perror("socket");
1.121 djm 1108: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1109: cleanup_exit(1);
1110: }
1111: memset(&sunaddr, 0, sizeof(sunaddr));
1112: sunaddr.sun_family = AF_UNIX;
1113: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1114: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) {
1115: perror("bind");
1.121 djm 1116: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1117: cleanup_exit(1);
1118: }
1.117 markus 1119: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1120: perror("listen");
1121: cleanup_exit(1);
1122: }
1.46 markus 1123:
1.23 markus 1124: /*
1125: * Fork, and have the parent execute the command, if any, or present
1126: * the socket data. The child continues as the authentication agent.
1127: */
1.57 markus 1128: if (d_flag) {
1129: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1130: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1131: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1132: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1133: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1134: goto skip;
1135: }
1.21 markus 1136: pid = fork();
1137: if (pid == -1) {
1138: perror("fork");
1.81 stevesk 1139: cleanup_exit(1);
1.21 markus 1140: }
1141: if (pid != 0) { /* Parent - execute the given command. */
1142: close(sock);
1.91 mpech 1143: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1144: if (ac == 0) {
1145: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1146: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1147: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1148: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1149: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1150: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1151: exit(0);
1152: }
1.36 deraadt 1153: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1154: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1155: perror("setenv");
1156: exit(1);
1157: }
1.21 markus 1158: execvp(av[0], av);
1159: perror(av[0]);
1160: exit(1);
1161: }
1.81 stevesk 1162: /* child */
1163: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1164:
1165: if (setsid() == -1) {
1.81 stevesk 1166: error("setsid: %s", strerror(errno));
1.67 stevesk 1167: cleanup_exit(1);
1168: }
1169:
1170: (void)chdir("/");
1.107 markus 1171: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1172: /* XXX might close listen socket */
1173: (void)dup2(fd, STDIN_FILENO);
1174: (void)dup2(fd, STDOUT_FILENO);
1175: (void)dup2(fd, STDERR_FILENO);
1176: if (fd > 2)
1177: close(fd);
1178: }
1.21 markus 1179:
1.41 markus 1180: /* deny core dumps, since memory contains unencrypted private keys */
1181: rlim.rlim_cur = rlim.rlim_max = 0;
1182: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1183: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1184: cleanup_exit(1);
1185: }
1.57 markus 1186:
1187: skip:
1.21 markus 1188: new_socket(AUTH_SOCKET, sock);
1189: if (ac > 0) {
1190: signal(SIGALRM, check_parent_exists);
1191: alarm(10);
1192: }
1.33 markus 1193: idtab_init();
1.61 markus 1194: if (!d_flag)
1.57 markus 1195: signal(SIGINT, SIG_IGN);
1.61 markus 1196: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1197: signal(SIGHUP, cleanup_handler);
1198: signal(SIGTERM, cleanup_handler);
1.66 markus 1199: nalloc = 0;
1200:
1.21 markus 1201: while (1) {
1.66 markus 1202: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1203: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1204: if (errno == EINTR)
1205: continue;
1.81 stevesk 1206: fatal("select: %s", strerror(errno));
1.21 markus 1207: }
1.46 markus 1208: after_select(readsetp, writesetp);
1.15 markus 1209: }
1.21 markus 1210: /* NOTREACHED */
1.1 deraadt 1211: }
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