Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.123
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"
1.78 provos 37: #include <sys/queue.h>
1.123 ! djm 38: RCSID("$OpenBSD: ssh-agent.c,v 1.122 2004/10/29 22:53:56 djm Exp $");
1.47 markus 39:
40: #include <openssl/evp.h>
41: #include <openssl/md5.h>
1.1 deraadt 42:
43: #include "ssh.h"
44: #include "rsa.h"
45: #include "buffer.h"
46: #include "bufaux.h"
47: #include "xmalloc.h"
48: #include "getput.h"
1.32 markus 49: #include "key.h"
50: #include "authfd.h"
1.37 markus 51: #include "compat.h"
1.47 markus 52: #include "log.h"
1.107 markus 53: #include "misc.h"
1.7 deraadt 54:
1.59 markus 55: #ifdef SMARTCARD
56: #include "scard.h"
1.71 jakob 57: #endif
1.59 markus 58:
1.73 stevesk 59: typedef enum {
60: AUTH_UNUSED,
61: AUTH_SOCKET,
62: AUTH_CONNECTION
63: } sock_type;
64:
1.21 markus 65: typedef struct {
66: int fd;
1.73 stevesk 67: sock_type type;
1.21 markus 68: Buffer input;
69: Buffer output;
1.87 markus 70: Buffer request;
1.1 deraadt 71: } SocketEntry;
72:
1.45 markus 73: u_int sockets_alloc = 0;
1.1 deraadt 74: SocketEntry *sockets = NULL;
75:
1.78 provos 76: typedef struct identity {
77: TAILQ_ENTRY(identity) next;
1.33 markus 78: Key *key;
1.21 markus 79: char *comment;
1.89 markus 80: u_int death;
1.107 markus 81: u_int confirm;
1.1 deraadt 82: } Identity;
83:
1.33 markus 84: typedef struct {
85: int nentries;
1.78 provos 86: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 87: } Idtab;
88:
89: /* private key table, one per protocol version */
90: Idtab idtable[3];
1.1 deraadt 91:
92: int max_fd = 0;
93:
1.11 markus 94: /* pid of shell == parent of agent */
1.29 deraadt 95: pid_t parent_pid = -1;
1.10 markus 96:
97: /* pathname and directory for AUTH_SOCKET */
98: char socket_name[1024];
99: char socket_dir[1024];
100:
1.88 markus 101: /* locking */
102: int locked = 0;
103: char *lock_passwd = NULL;
104:
1.20 markus 105: extern char *__progname;
106:
1.106 marc 107: /* Default lifetime (0 == forever) */
108: static int lifetime = 0;
109:
1.55 itojun 110: static void
1.101 stevesk 111: close_socket(SocketEntry *e)
112: {
113: close(e->fd);
114: e->fd = -1;
115: e->type = AUTH_UNUSED;
116: buffer_free(&e->input);
117: buffer_free(&e->output);
118: buffer_free(&e->request);
119: }
120:
121: static void
1.33 markus 122: idtab_init(void)
1.1 deraadt 123: {
1.33 markus 124: int i;
1.96 deraadt 125:
1.74 deraadt 126: for (i = 0; i <=2; i++) {
1.78 provos 127: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 128: idtable[i].nentries = 0;
129: }
130: }
131:
132: /* return private key table for requested protocol version */
1.55 itojun 133: static Idtab *
1.33 markus 134: idtab_lookup(int version)
135: {
136: if (version < 1 || version > 2)
137: fatal("internal error, bad protocol version %d", version);
138: return &idtable[version];
139: }
140:
1.89 markus 141: static void
142: free_identity(Identity *id)
143: {
144: key_free(id->key);
145: xfree(id->comment);
146: xfree(id);
147: }
148:
1.33 markus 149: /* return matching private key for given public key */
1.78 provos 150: static Identity *
151: lookup_identity(Key *key, int version)
1.33 markus 152: {
1.78 provos 153: Identity *id;
154:
1.33 markus 155: Idtab *tab = idtab_lookup(version);
1.78 provos 156: TAILQ_FOREACH(id, &tab->idlist, next) {
157: if (key_equal(key, id->key))
158: return (id);
1.33 markus 159: }
1.78 provos 160: return (NULL);
161: }
162:
1.107 markus 163: /* Check confirmation of keysign request */
164: static int
165: confirm_key(Identity *id)
166: {
1.122 djm 167: char *p;
1.107 markus 168: int ret = -1;
169:
170: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 171: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
172: id->comment, p))
173: ret = 0;
1.107 markus 174: xfree(p);
1.122 djm 175:
1.107 markus 176: return (ret);
177: }
178:
1.33 markus 179: /* send list of supported public keys to 'client' */
1.55 itojun 180: static void
1.33 markus 181: process_request_identities(SocketEntry *e, int version)
182: {
183: Idtab *tab = idtab_lookup(version);
1.96 deraadt 184: Identity *id;
1.21 markus 185: Buffer msg;
1.1 deraadt 186:
1.21 markus 187: buffer_init(&msg);
1.33 markus 188: buffer_put_char(&msg, (version == 1) ?
189: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
190: buffer_put_int(&msg, tab->nentries);
1.78 provos 191: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 192: if (id->key->type == KEY_RSA1) {
1.33 markus 193: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
194: buffer_put_bignum(&msg, id->key->rsa->e);
195: buffer_put_bignum(&msg, id->key->rsa->n);
196: } else {
1.45 markus 197: u_char *blob;
198: u_int blen;
1.39 markus 199: key_to_blob(id->key, &blob, &blen);
1.33 markus 200: buffer_put_string(&msg, blob, blen);
201: xfree(blob);
202: }
203: buffer_put_cstring(&msg, id->comment);
1.21 markus 204: }
205: buffer_put_int(&e->output, buffer_len(&msg));
206: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
207: buffer_free(&msg);
1.1 deraadt 208: }
209:
1.33 markus 210: /* ssh1 only */
1.55 itojun 211: static void
1.33 markus 212: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 213: {
1.96 deraadt 214: u_char buf[32], mdbuf[16], session_id[16];
215: u_int response_type;
216: BIGNUM *challenge;
1.78 provos 217: Identity *id;
1.33 markus 218: int i, len;
1.21 markus 219: Buffer msg;
220: MD5_CTX md;
1.96 deraadt 221: Key *key;
1.21 markus 222:
223: buffer_init(&msg);
1.39 markus 224: key = key_new(KEY_RSA1);
1.76 markus 225: if ((challenge = BN_new()) == NULL)
226: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 227:
1.97 markus 228: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 229: buffer_get_bignum(&e->request, key->rsa->e);
230: buffer_get_bignum(&e->request, key->rsa->n);
231: buffer_get_bignum(&e->request, challenge);
1.21 markus 232:
1.33 markus 233: /* Only protocol 1.1 is supported */
1.87 markus 234: if (buffer_len(&e->request) == 0)
1.33 markus 235: goto failure;
1.87 markus 236: buffer_get(&e->request, session_id, 16);
237: response_type = buffer_get_int(&e->request);
1.33 markus 238: if (response_type != 1)
239: goto failure;
240:
1.78 provos 241: id = lookup_identity(key, 1);
1.107 markus 242: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 243: Key *private = id->key;
1.33 markus 244: /* Decrypt the challenge using the private key. */
1.49 markus 245: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
246: goto failure;
1.33 markus 247:
248: /* The response is MD5 of decrypted challenge plus session id. */
249: len = BN_num_bytes(challenge);
250: if (len <= 0 || len > 32) {
1.109 itojun 251: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 252: goto failure;
253: }
254: memset(buf, 0, 32);
255: BN_bn2bin(challenge, buf + 32 - len);
256: MD5_Init(&md);
257: MD5_Update(&md, buf, 32);
258: MD5_Update(&md, session_id, 16);
259: MD5_Final(mdbuf, &md);
260:
261: /* Send the response. */
262: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
263: for (i = 0; i < 16; i++)
264: buffer_put_char(&msg, mdbuf[i]);
265: goto send;
266: }
1.21 markus 267:
1.33 markus 268: failure:
269: /* Unknown identity or protocol error. Send failure. */
1.21 markus 270: buffer_put_char(&msg, SSH_AGENT_FAILURE);
271: send:
272: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 273: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
274: key_free(key);
275: BN_clear_free(challenge);
276: buffer_free(&msg);
277: }
278:
279: /* ssh2 only */
1.55 itojun 280: static void
1.33 markus 281: process_sign_request2(SocketEntry *e)
282: {
1.45 markus 283: u_char *blob, *data, *signature = NULL;
284: u_int blen, dlen, slen = 0;
1.96 deraadt 285: extern int datafellows;
286: int ok = -1, flags;
1.33 markus 287: Buffer msg;
1.96 deraadt 288: Key *key;
1.33 markus 289:
290: datafellows = 0;
1.43 markus 291:
1.87 markus 292: blob = buffer_get_string(&e->request, &blen);
293: data = buffer_get_string(&e->request, &dlen);
1.37 markus 294:
1.87 markus 295: flags = buffer_get_int(&e->request);
1.37 markus 296: if (flags & SSH_AGENT_OLD_SIGNATURE)
297: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 298:
1.39 markus 299: key = key_from_blob(blob, blen);
1.33 markus 300: if (key != NULL) {
1.78 provos 301: Identity *id = lookup_identity(key, 2);
1.107 markus 302: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 303: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.33 markus 304: }
305: key_free(key);
306: buffer_init(&msg);
307: if (ok == 0) {
308: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
309: buffer_put_string(&msg, signature, slen);
310: } else {
311: buffer_put_char(&msg, SSH_AGENT_FAILURE);
312: }
313: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 314: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 315: buffer_len(&msg));
1.21 markus 316: buffer_free(&msg);
1.33 markus 317: xfree(data);
318: xfree(blob);
319: if (signature != NULL)
320: xfree(signature);
1.1 deraadt 321: }
322:
1.33 markus 323: /* shared */
1.55 itojun 324: static void
1.33 markus 325: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 326: {
1.96 deraadt 327: u_int blen, bits;
328: int success = 0;
1.78 provos 329: Key *key = NULL;
1.45 markus 330: u_char *blob;
1.21 markus 331:
1.74 deraadt 332: switch (version) {
1.33 markus 333: case 1:
1.39 markus 334: key = key_new(KEY_RSA1);
1.87 markus 335: bits = buffer_get_int(&e->request);
336: buffer_get_bignum(&e->request, key->rsa->e);
337: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 338:
339: if (bits != key_size(key))
1.109 itojun 340: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 341: key_size(key), bits);
1.33 markus 342: break;
343: case 2:
1.87 markus 344: blob = buffer_get_string(&e->request, &blen);
1.39 markus 345: key = key_from_blob(blob, blen);
1.33 markus 346: xfree(blob);
347: break;
348: }
349: if (key != NULL) {
1.78 provos 350: Identity *id = lookup_identity(key, version);
351: if (id != NULL) {
1.23 markus 352: /*
353: * We have this key. Free the old key. Since we
354: * don\'t want to leave empty slots in the middle of
1.40 markus 355: * the array, we actually free the key there and move
356: * all the entries between the empty slot and the end
357: * of the array.
1.23 markus 358: */
1.33 markus 359: Idtab *tab = idtab_lookup(version);
1.38 markus 360: if (tab->nentries < 1)
361: fatal("process_remove_identity: "
362: "internal error: tab->nentries %d",
363: tab->nentries);
1.78 provos 364: TAILQ_REMOVE(&tab->idlist, id, next);
365: free_identity(id);
1.33 markus 366: tab->nentries--;
367: success = 1;
1.21 markus 368: }
1.33 markus 369: key_free(key);
370: }
1.1 deraadt 371: buffer_put_int(&e->output, 1);
1.33 markus 372: buffer_put_char(&e->output,
373: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 374: }
375:
1.55 itojun 376: static void
1.33 markus 377: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 378: {
1.33 markus 379: Idtab *tab = idtab_lookup(version);
1.78 provos 380: Identity *id;
1.21 markus 381:
382: /* Loop over all identities and clear the keys. */
1.78 provos 383: for (id = TAILQ_FIRST(&tab->idlist); id;
384: id = TAILQ_FIRST(&tab->idlist)) {
385: TAILQ_REMOVE(&tab->idlist, id, next);
386: free_identity(id);
1.21 markus 387: }
388:
389: /* Mark that there are no identities. */
1.33 markus 390: tab->nentries = 0;
1.21 markus 391:
392: /* Send success. */
393: buffer_put_int(&e->output, 1);
394: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 395: }
396:
1.55 itojun 397: static void
1.89 markus 398: reaper(void)
399: {
1.96 deraadt 400: u_int now = time(NULL);
1.89 markus 401: Identity *id, *nxt;
402: int version;
1.96 deraadt 403: Idtab *tab;
1.89 markus 404:
405: for (version = 1; version < 3; version++) {
406: tab = idtab_lookup(version);
407: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
408: nxt = TAILQ_NEXT(id, next);
409: if (id->death != 0 && now >= id->death) {
410: TAILQ_REMOVE(&tab->idlist, id, next);
411: free_identity(id);
412: tab->nentries--;
413: }
414: }
415: }
416: }
417:
418: static void
1.33 markus 419: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 420: {
1.96 deraadt 421: Idtab *tab = idtab_lookup(version);
1.107 markus 422: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 423: char *type_name, *comment;
1.33 markus 424: Key *k = NULL;
425:
426: switch (version) {
427: case 1:
1.39 markus 428: k = key_new_private(KEY_RSA1);
1.97 markus 429: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 430: buffer_get_bignum(&e->request, k->rsa->n);
431: buffer_get_bignum(&e->request, k->rsa->e);
432: buffer_get_bignum(&e->request, k->rsa->d);
433: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 434:
435: /* SSH and SSL have p and q swapped */
1.87 markus 436: buffer_get_bignum(&e->request, k->rsa->q); /* p */
437: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 438:
439: /* Generate additional parameters */
1.60 markus 440: rsa_generate_additional_parameters(k->rsa);
1.33 markus 441: break;
442: case 2:
1.87 markus 443: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 444: type = key_type_from_name(type_name);
1.39 markus 445: xfree(type_name);
1.74 deraadt 446: switch (type) {
1.39 markus 447: case KEY_DSA:
448: k = key_new_private(type);
1.87 markus 449: buffer_get_bignum2(&e->request, k->dsa->p);
450: buffer_get_bignum2(&e->request, k->dsa->q);
451: buffer_get_bignum2(&e->request, k->dsa->g);
452: buffer_get_bignum2(&e->request, k->dsa->pub_key);
453: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 454: break;
455: case KEY_RSA:
456: k = key_new_private(type);
1.87 markus 457: buffer_get_bignum2(&e->request, k->rsa->n);
458: buffer_get_bignum2(&e->request, k->rsa->e);
459: buffer_get_bignum2(&e->request, k->rsa->d);
460: buffer_get_bignum2(&e->request, k->rsa->iqmp);
461: buffer_get_bignum2(&e->request, k->rsa->p);
462: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 463:
464: /* Generate additional parameters */
1.60 markus 465: rsa_generate_additional_parameters(k->rsa);
1.39 markus 466: break;
467: default:
1.87 markus 468: buffer_clear(&e->request);
1.108 markus 469: goto send;
470: }
471: break;
472: }
473: /* enable blinding */
474: switch (k->type) {
475: case KEY_RSA:
476: case KEY_RSA1:
477: if (RSA_blinding_on(k->rsa, NULL) != 1) {
478: error("process_add_identity: RSA_blinding_on failed");
479: key_free(k);
1.33 markus 480: goto send;
1.21 markus 481: }
1.33 markus 482: break;
483: }
1.87 markus 484: comment = buffer_get_string(&e->request, NULL);
1.33 markus 485: if (k == NULL) {
486: xfree(comment);
487: goto send;
488: }
489: success = 1;
1.94 markus 490: while (buffer_len(&e->request)) {
491: switch (buffer_get_char(&e->request)) {
492: case SSH_AGENT_CONSTRAIN_LIFETIME:
493: death = time(NULL) + buffer_get_int(&e->request);
494: break;
1.107 markus 495: case SSH_AGENT_CONSTRAIN_CONFIRM:
496: confirm = 1;
497: break;
1.94 markus 498: default:
499: break;
500: }
501: }
1.106 marc 502: if (lifetime && !death)
503: death = time(NULL) + lifetime;
1.78 provos 504: if (lookup_identity(k, version) == NULL) {
505: Identity *id = xmalloc(sizeof(Identity));
506: id->key = k;
507: id->comment = comment;
1.94 markus 508: id->death = death;
1.107 markus 509: id->confirm = confirm;
1.78 provos 510: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 511: /* Increment the number of identities. */
512: tab->nentries++;
513: } else {
514: key_free(k);
515: xfree(comment);
516: }
517: send:
1.1 deraadt 518: buffer_put_int(&e->output, 1);
1.33 markus 519: buffer_put_char(&e->output,
520: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 521: }
522:
1.88 markus 523: /* XXX todo: encrypt sensitive data with passphrase */
524: static void
525: process_lock_agent(SocketEntry *e, int lock)
526: {
1.96 deraadt 527: int success = 0;
1.88 markus 528: char *passwd;
529:
530: passwd = buffer_get_string(&e->request, NULL);
531: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
532: locked = 0;
533: memset(lock_passwd, 0, strlen(lock_passwd));
534: xfree(lock_passwd);
535: lock_passwd = NULL;
536: success = 1;
537: } else if (!locked && lock) {
538: locked = 1;
539: lock_passwd = xstrdup(passwd);
540: success = 1;
541: }
542: memset(passwd, 0, strlen(passwd));
543: xfree(passwd);
1.95 deraadt 544:
1.88 markus 545: buffer_put_int(&e->output, 1);
546: buffer_put_char(&e->output,
547: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
548: }
549:
550: static void
551: no_identities(SocketEntry *e, u_int type)
552: {
553: Buffer msg;
554:
555: buffer_init(&msg);
556: buffer_put_char(&msg,
557: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
558: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
559: buffer_put_int(&msg, 0);
560: buffer_put_int(&e->output, buffer_len(&msg));
561: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
562: buffer_free(&msg);
563: }
1.59 markus 564:
565: #ifdef SMARTCARD
566: static void
567: process_add_smartcard_key (SocketEntry *e)
568: {
1.96 deraadt 569: char *sc_reader_id = NULL, *pin;
1.110 djm 570: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 571: Key **keys, *k;
1.84 markus 572: Identity *id;
1.59 markus 573: Idtab *tab;
1.75 deraadt 574:
1.87 markus 575: sc_reader_id = buffer_get_string(&e->request, NULL);
576: pin = buffer_get_string(&e->request, NULL);
1.110 djm 577:
578: while (buffer_len(&e->request)) {
579: switch (buffer_get_char(&e->request)) {
580: case SSH_AGENT_CONSTRAIN_LIFETIME:
581: death = time(NULL) + buffer_get_int(&e->request);
582: break;
583: case SSH_AGENT_CONSTRAIN_CONFIRM:
584: confirm = 1;
585: break;
586: default:
587: break;
588: }
589: }
590: if (lifetime && !death)
591: death = time(NULL) + lifetime;
592:
1.84 markus 593: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 594: xfree(sc_reader_id);
1.83 rees 595: xfree(pin);
1.59 markus 596:
1.84 markus 597: if (keys == NULL || keys[0] == NULL) {
598: error("sc_get_keys failed");
1.59 markus 599: goto send;
600: }
1.84 markus 601: for (i = 0; keys[i] != NULL; i++) {
602: k = keys[i];
603: version = k->type == KEY_RSA1 ? 1 : 2;
604: tab = idtab_lookup(version);
605: if (lookup_identity(k, version) == NULL) {
606: id = xmalloc(sizeof(Identity));
607: id->key = k;
1.111 markus 608: id->comment = sc_get_key_label(k);
1.110 djm 609: id->death = death;
610: id->confirm = confirm;
1.84 markus 611: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
612: tab->nentries++;
613: success = 1;
614: } else {
615: key_free(k);
616: }
617: keys[i] = NULL;
1.59 markus 618: }
1.84 markus 619: xfree(keys);
1.59 markus 620: send:
621: buffer_put_int(&e->output, 1);
622: buffer_put_char(&e->output,
623: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
624: }
625:
626: static void
627: process_remove_smartcard_key(SocketEntry *e)
628: {
1.96 deraadt 629: char *sc_reader_id = NULL, *pin;
630: int i, version, success = 0;
631: Key **keys, *k = NULL;
1.84 markus 632: Identity *id;
633: Idtab *tab;
1.59 markus 634:
1.87 markus 635: sc_reader_id = buffer_get_string(&e->request, NULL);
636: pin = buffer_get_string(&e->request, NULL);
1.84 markus 637: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 638: xfree(sc_reader_id);
1.83 rees 639: xfree(pin);
1.59 markus 640:
1.84 markus 641: if (keys == NULL || keys[0] == NULL) {
642: error("sc_get_keys failed");
643: goto send;
644: }
645: for (i = 0; keys[i] != NULL; i++) {
646: k = keys[i];
647: version = k->type == KEY_RSA1 ? 1 : 2;
648: if ((id = lookup_identity(k, version)) != NULL) {
649: tab = idtab_lookup(version);
1.90 markus 650: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 651: tab->nentries--;
1.78 provos 652: free_identity(id);
1.59 markus 653: success = 1;
654: }
655: key_free(k);
1.84 markus 656: keys[i] = NULL;
1.59 markus 657: }
1.84 markus 658: xfree(keys);
659: send:
1.59 markus 660: buffer_put_int(&e->output, 1);
661: buffer_put_char(&e->output,
662: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
663: }
1.70 jakob 664: #endif /* SMARTCARD */
1.59 markus 665:
1.33 markus 666: /* dispatch incoming messages */
667:
1.55 itojun 668: static void
1.2 provos 669: process_message(SocketEntry *e)
1.1 deraadt 670: {
1.96 deraadt 671: u_int msg_len, type;
1.45 markus 672: u_char *cp;
1.89 markus 673:
674: /* kill dead keys */
675: reaper();
676:
1.21 markus 677: if (buffer_len(&e->input) < 5)
678: return; /* Incomplete message. */
1.77 stevesk 679: cp = buffer_ptr(&e->input);
1.21 markus 680: msg_len = GET_32BIT(cp);
681: if (msg_len > 256 * 1024) {
1.101 stevesk 682: close_socket(e);
1.21 markus 683: return;
684: }
685: if (buffer_len(&e->input) < msg_len + 4)
686: return;
1.87 markus 687:
688: /* move the current input to e->request */
1.21 markus 689: buffer_consume(&e->input, 4);
1.87 markus 690: buffer_clear(&e->request);
691: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
692: buffer_consume(&e->input, msg_len);
693: type = buffer_get_char(&e->request);
1.21 markus 694:
1.88 markus 695: /* check wheter agent is locked */
696: if (locked && type != SSH_AGENTC_UNLOCK) {
697: buffer_clear(&e->request);
698: switch (type) {
699: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
700: case SSH2_AGENTC_REQUEST_IDENTITIES:
701: /* send empty lists */
702: no_identities(e, type);
703: break;
704: default:
705: /* send a fail message for all other request types */
706: buffer_put_int(&e->output, 1);
707: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
708: }
709: return;
710: }
711:
1.59 markus 712: debug("type %d", type);
1.21 markus 713: switch (type) {
1.88 markus 714: case SSH_AGENTC_LOCK:
715: case SSH_AGENTC_UNLOCK:
716: process_lock_agent(e, type == SSH_AGENTC_LOCK);
717: break;
1.33 markus 718: /* ssh1 */
719: case SSH_AGENTC_RSA_CHALLENGE:
720: process_authentication_challenge1(e);
721: break;
1.21 markus 722: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 723: process_request_identities(e, 1);
1.21 markus 724: break;
725: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 726: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 727: process_add_identity(e, 1);
1.21 markus 728: break;
729: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 730: process_remove_identity(e, 1);
1.21 markus 731: break;
732: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 733: process_remove_all_identities(e, 1);
734: break;
735: /* ssh2 */
736: case SSH2_AGENTC_SIGN_REQUEST:
737: process_sign_request2(e);
738: break;
739: case SSH2_AGENTC_REQUEST_IDENTITIES:
740: process_request_identities(e, 2);
741: break;
742: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 743: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 744: process_add_identity(e, 2);
745: break;
746: case SSH2_AGENTC_REMOVE_IDENTITY:
747: process_remove_identity(e, 2);
748: break;
749: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
750: process_remove_all_identities(e, 2);
1.21 markus 751: break;
1.59 markus 752: #ifdef SMARTCARD
753: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 754: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 755: process_add_smartcard_key(e);
1.75 deraadt 756: break;
1.59 markus 757: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
758: process_remove_smartcard_key(e);
1.75 deraadt 759: break;
1.70 jakob 760: #endif /* SMARTCARD */
1.21 markus 761: default:
762: /* Unknown message. Respond with failure. */
763: error("Unknown message %d", type);
1.87 markus 764: buffer_clear(&e->request);
1.21 markus 765: buffer_put_int(&e->output, 1);
766: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
767: break;
768: }
1.1 deraadt 769: }
770:
1.55 itojun 771: static void
1.73 stevesk 772: new_socket(sock_type type, int fd)
1.1 deraadt 773: {
1.112 markus 774: u_int i, old_alloc, new_alloc;
1.96 deraadt 775:
1.119 djm 776: set_nonblock(fd);
1.21 markus 777:
778: if (fd > max_fd)
779: max_fd = fd;
780:
781: for (i = 0; i < sockets_alloc; i++)
782: if (sockets[i].type == AUTH_UNUSED) {
783: sockets[i].fd = fd;
784: buffer_init(&sockets[i].input);
785: buffer_init(&sockets[i].output);
1.87 markus 786: buffer_init(&sockets[i].request);
1.112 markus 787: sockets[i].type = type;
1.21 markus 788: return;
789: }
790: old_alloc = sockets_alloc;
1.112 markus 791: new_alloc = sockets_alloc + 10;
1.21 markus 792: if (sockets)
1.112 markus 793: sockets = xrealloc(sockets, new_alloc * sizeof(sockets[0]));
1.21 markus 794: else
1.112 markus 795: sockets = xmalloc(new_alloc * sizeof(sockets[0]));
796: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 797: sockets[i].type = AUTH_UNUSED;
1.112 markus 798: sockets_alloc = new_alloc;
1.21 markus 799: sockets[old_alloc].fd = fd;
800: buffer_init(&sockets[old_alloc].input);
801: buffer_init(&sockets[old_alloc].output);
1.87 markus 802: buffer_init(&sockets[old_alloc].request);
1.112 markus 803: sockets[old_alloc].type = type;
1.1 deraadt 804: }
805:
1.55 itojun 806: static int
1.120 avsm 807: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 808: {
1.46 markus 809: u_int i, sz;
810: int n = 0;
811:
812: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 813: switch (sockets[i].type) {
814: case AUTH_SOCKET:
815: case AUTH_CONNECTION:
1.46 markus 816: n = MAX(n, sockets[i].fd);
1.21 markus 817: break;
818: case AUTH_UNUSED:
819: break;
820: default:
821: fatal("Unknown socket type %d", sockets[i].type);
822: break;
823: }
1.46 markus 824: }
825:
826: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 827: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 828: if (*fdrp)
1.54 stevesk 829: xfree(*fdrp);
1.46 markus 830: if (*fdwp)
1.54 stevesk 831: xfree(*fdwp);
1.46 markus 832: *fdrp = xmalloc(sz);
833: *fdwp = xmalloc(sz);
1.66 markus 834: *nallocp = sz;
1.46 markus 835: }
1.66 markus 836: if (n < *fdl)
837: debug("XXX shrink: %d < %d", n, *fdl);
838: *fdl = n;
1.46 markus 839: memset(*fdrp, 0, sz);
840: memset(*fdwp, 0, sz);
841:
842: for (i = 0; i < sockets_alloc; i++) {
843: switch (sockets[i].type) {
844: case AUTH_SOCKET:
845: case AUTH_CONNECTION:
846: FD_SET(sockets[i].fd, *fdrp);
847: if (buffer_len(&sockets[i].output) > 0)
848: FD_SET(sockets[i].fd, *fdwp);
849: break;
850: default:
851: break;
852: }
853: }
854: return (1);
1.21 markus 855: }
856:
1.55 itojun 857: static void
1.21 markus 858: after_select(fd_set *readset, fd_set *writeset)
859: {
1.96 deraadt 860: struct sockaddr_un sunaddr;
1.26 markus 861: socklen_t slen;
1.21 markus 862: char buf[1024];
1.96 deraadt 863: int len, sock;
864: u_int i;
1.103 markus 865: uid_t euid;
866: gid_t egid;
1.21 markus 867:
868: for (i = 0; i < sockets_alloc; i++)
869: switch (sockets[i].type) {
870: case AUTH_UNUSED:
871: break;
872: case AUTH_SOCKET:
873: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 874: slen = sizeof(sunaddr);
1.46 markus 875: sock = accept(sockets[i].fd,
876: (struct sockaddr *) &sunaddr, &slen);
1.21 markus 877: if (sock < 0) {
1.81 stevesk 878: error("accept from AUTH_SOCKET: %s",
879: strerror(errno));
1.103 markus 880: break;
881: }
882: if (getpeereid(sock, &euid, &egid) < 0) {
883: error("getpeereid %d failed: %s",
884: sock, strerror(errno));
885: close(sock);
886: break;
887: }
1.105 markus 888: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 889: error("uid mismatch: "
1.104 stevesk 890: "peer euid %u != uid %u",
891: (u_int) euid, (u_int) getuid());
1.103 markus 892: close(sock);
1.21 markus 893: break;
894: }
895: new_socket(AUTH_CONNECTION, sock);
896: }
897: break;
898: case AUTH_CONNECTION:
899: if (buffer_len(&sockets[i].output) > 0 &&
900: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 901: do {
902: len = write(sockets[i].fd,
903: buffer_ptr(&sockets[i].output),
904: buffer_len(&sockets[i].output));
905: if (len == -1 && (errno == EAGAIN ||
906: errno == EINTR))
907: continue;
908: break;
909: } while (1);
1.21 markus 910: if (len <= 0) {
1.101 stevesk 911: close_socket(&sockets[i]);
1.21 markus 912: break;
913: }
914: buffer_consume(&sockets[i].output, len);
915: }
916: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 917: do {
918: len = read(sockets[i].fd, buf, sizeof(buf));
919: if (len == -1 && (errno == EAGAIN ||
920: errno == EINTR))
921: continue;
922: break;
923: } while (1);
1.21 markus 924: if (len <= 0) {
1.101 stevesk 925: close_socket(&sockets[i]);
1.21 markus 926: break;
927: }
928: buffer_append(&sockets[i].input, buf, len);
929: process_message(&sockets[i]);
930: }
931: break;
932: default:
933: fatal("Unknown type %d", sockets[i].type);
934: }
1.1 deraadt 935: }
936:
1.55 itojun 937: static void
1.113 markus 938: cleanup_socket(void)
1.15 markus 939: {
1.48 deraadt 940: if (socket_name[0])
941: unlink(socket_name);
942: if (socket_dir[0])
943: rmdir(socket_dir);
1.10 markus 944: }
945:
1.114 markus 946: void
1.15 markus 947: cleanup_exit(int i)
948: {
1.113 markus 949: cleanup_socket();
950: _exit(i);
1.15 markus 951: }
952:
1.55 itojun 953: static void
1.48 deraadt 954: cleanup_handler(int sig)
955: {
1.113 markus 956: cleanup_socket();
1.48 deraadt 957: _exit(2);
1.113 markus 958: }
959:
1.68 markus 960: static void
961: check_parent_exists(int sig)
962: {
963: int save_errno = errno;
964:
965: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
966: /* printf("Parent has died - Authentication agent exiting.\n"); */
967: cleanup_handler(sig); /* safe */
968: }
969: signal(SIGALRM, check_parent_exists);
970: alarm(10);
971: errno = save_errno;
1.48 deraadt 972: }
973:
1.55 itojun 974: static void
1.50 itojun 975: usage(void)
1.15 markus 976: {
1.72 jakob 977: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 978: __progname);
1.72 jakob 979: fprintf(stderr, "Options:\n");
980: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
981: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
982: fprintf(stderr, " -k Kill the current agent.\n");
983: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 984: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 985: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 986: exit(1);
1.15 markus 987: }
988:
1.2 provos 989: int
990: main(int ac, char **av)
1.1 deraadt 991: {
1.107 markus 992: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.120 avsm 993: int sock, fd, ch;
994: u_int nalloc;
1.96 deraadt 995: char *shell, *format, *pidstr, *agentsocket = NULL;
996: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 997: struct sockaddr_un sunaddr;
1.41 markus 998: struct rlimit rlim;
1.96 deraadt 999: extern int optind;
1.98 stevesk 1000: extern char *optarg;
1.21 markus 1001: pid_t pid;
1.96 deraadt 1002: char pidstrbuf[1 + 3 * sizeof pid];
1.123 ! djm 1003:
! 1004: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
! 1005: sanitise_stdfd();
1.99 markus 1006:
1007: /* drop */
1008: setegid(getgid());
1009: setgid(getgid());
1.53 markus 1010:
1011: SSLeay_add_all_algorithms();
1.21 markus 1012:
1.106 marc 1013: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1014: switch (ch) {
1015: case 'c':
1016: if (s_flag)
1017: usage();
1018: c_flag++;
1019: break;
1020: case 'k':
1021: k_flag++;
1022: break;
1023: case 's':
1024: if (c_flag)
1025: usage();
1026: s_flag++;
1027: break;
1.57 markus 1028: case 'd':
1029: if (d_flag)
1030: usage();
1031: d_flag++;
1032: break;
1.86 markus 1033: case 'a':
1034: agentsocket = optarg;
1.106 marc 1035: break;
1036: case 't':
1037: if ((lifetime = convtime(optarg)) == -1) {
1038: fprintf(stderr, "Invalid lifetime\n");
1039: usage();
1040: }
1.86 markus 1041: break;
1.21 markus 1042: default:
1043: usage();
1044: }
1045: }
1046: ac -= optind;
1047: av += optind;
1048:
1.57 markus 1049: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1050: usage();
1051:
1.85 markus 1052: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1053: shell = getenv("SHELL");
1054: if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1055: c_flag = 1;
1056: }
1057: if (k_flag) {
1058: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1059: if (pidstr == NULL) {
1060: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1061: SSH_AGENTPID_ENV_NAME);
1.21 markus 1062: exit(1);
1063: }
1064: pid = atoi(pidstr);
1.46 markus 1065: if (pid < 1) {
1.21 markus 1066: fprintf(stderr, "%s=\"%s\", which is not a good PID\n",
1.46 markus 1067: SSH_AGENTPID_ENV_NAME, pidstr);
1.21 markus 1068: exit(1);
1069: }
1070: if (kill(pid, SIGTERM) == -1) {
1071: perror("kill");
1072: exit(1);
1073: }
1074: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1075: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1076: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1077: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1078: exit(0);
1079: }
1080: parent_pid = getpid();
1081:
1.86 markus 1082: if (agentsocket == NULL) {
1083: /* Create private directory for agent socket */
1.115 markus 1084: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1085: if (mkdtemp(socket_dir) == NULL) {
1086: perror("mkdtemp: private socket dir");
1087: exit(1);
1088: }
1.91 mpech 1089: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1090: (long)parent_pid);
1.86 markus 1091: } else {
1092: /* Try to use specified agent socket */
1093: socket_dir[0] = '\0';
1094: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1095: }
1096:
1.23 markus 1097: /*
1098: * Create socket early so it will exist before command gets run from
1099: * the parent.
1100: */
1.21 markus 1101: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1102: if (sock < 0) {
1103: perror("socket");
1.121 djm 1104: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1105: cleanup_exit(1);
1106: }
1107: memset(&sunaddr, 0, sizeof(sunaddr));
1108: sunaddr.sun_family = AF_UNIX;
1109: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1110: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) {
1111: perror("bind");
1.121 djm 1112: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1113: cleanup_exit(1);
1114: }
1.117 markus 1115: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1116: perror("listen");
1117: cleanup_exit(1);
1118: }
1.46 markus 1119:
1.23 markus 1120: /*
1121: * Fork, and have the parent execute the command, if any, or present
1122: * the socket data. The child continues as the authentication agent.
1123: */
1.57 markus 1124: if (d_flag) {
1125: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1126: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1127: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1128: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1129: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1130: goto skip;
1131: }
1.21 markus 1132: pid = fork();
1133: if (pid == -1) {
1134: perror("fork");
1.81 stevesk 1135: cleanup_exit(1);
1.21 markus 1136: }
1137: if (pid != 0) { /* Parent - execute the given command. */
1138: close(sock);
1.91 mpech 1139: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1140: if (ac == 0) {
1141: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1142: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1143: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1144: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1145: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1146: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1147: exit(0);
1148: }
1.36 deraadt 1149: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1150: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1151: perror("setenv");
1152: exit(1);
1153: }
1.21 markus 1154: execvp(av[0], av);
1155: perror(av[0]);
1156: exit(1);
1157: }
1.81 stevesk 1158: /* child */
1159: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1160:
1161: if (setsid() == -1) {
1.81 stevesk 1162: error("setsid: %s", strerror(errno));
1.67 stevesk 1163: cleanup_exit(1);
1164: }
1165:
1166: (void)chdir("/");
1.107 markus 1167: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1168: /* XXX might close listen socket */
1169: (void)dup2(fd, STDIN_FILENO);
1170: (void)dup2(fd, STDOUT_FILENO);
1171: (void)dup2(fd, STDERR_FILENO);
1172: if (fd > 2)
1173: close(fd);
1174: }
1.21 markus 1175:
1.41 markus 1176: /* deny core dumps, since memory contains unencrypted private keys */
1177: rlim.rlim_cur = rlim.rlim_max = 0;
1178: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1179: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1180: cleanup_exit(1);
1181: }
1.57 markus 1182:
1183: skip:
1.21 markus 1184: new_socket(AUTH_SOCKET, sock);
1185: if (ac > 0) {
1186: signal(SIGALRM, check_parent_exists);
1187: alarm(10);
1188: }
1.33 markus 1189: idtab_init();
1.61 markus 1190: if (!d_flag)
1.57 markus 1191: signal(SIGINT, SIG_IGN);
1.61 markus 1192: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1193: signal(SIGHUP, cleanup_handler);
1194: signal(SIGTERM, cleanup_handler);
1.66 markus 1195: nalloc = 0;
1196:
1.21 markus 1197: while (1) {
1.66 markus 1198: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1199: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1200: if (errno == EINTR)
1201: continue;
1.81 stevesk 1202: fatal("select: %s", strerror(errno));
1.21 markus 1203: }
1.46 markus 1204: after_select(readsetp, writesetp);
1.15 markus 1205: }
1.21 markus 1206: /* NOTREACHED */
1.1 deraadt 1207: }
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