Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.130
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"
1.125 stevesk 37:
1.78 provos 38: #include <sys/queue.h>
1.127 stevesk 39: #include <sys/resource.h>
1.128 stevesk 40: #include <sys/types.h>
41: #include <sys/un.h>
1.126 stevesk 42:
43: #include <paths.h>
1.129 stevesk 44: #include <signal.h>
1.47 markus 45:
46: #include <openssl/evp.h>
47: #include <openssl/md5.h>
1.1 deraadt 48:
49: #include "ssh.h"
50: #include "rsa.h"
51: #include "buffer.h"
52: #include "bufaux.h"
53: #include "xmalloc.h"
54: #include "getput.h"
1.32 markus 55: #include "key.h"
56: #include "authfd.h"
1.37 markus 57: #include "compat.h"
1.47 markus 58: #include "log.h"
1.107 markus 59: #include "misc.h"
1.7 deraadt 60:
1.59 markus 61: #ifdef SMARTCARD
62: #include "scard.h"
1.71 jakob 63: #endif
1.59 markus 64:
1.73 stevesk 65: typedef enum {
66: AUTH_UNUSED,
67: AUTH_SOCKET,
68: AUTH_CONNECTION
69: } sock_type;
70:
1.21 markus 71: typedef struct {
72: int fd;
1.73 stevesk 73: sock_type type;
1.21 markus 74: Buffer input;
75: Buffer output;
1.87 markus 76: Buffer request;
1.1 deraadt 77: } SocketEntry;
78:
1.45 markus 79: u_int sockets_alloc = 0;
1.1 deraadt 80: SocketEntry *sockets = NULL;
81:
1.78 provos 82: typedef struct identity {
83: TAILQ_ENTRY(identity) next;
1.33 markus 84: Key *key;
1.21 markus 85: char *comment;
1.89 markus 86: u_int death;
1.107 markus 87: u_int confirm;
1.1 deraadt 88: } Identity;
89:
1.33 markus 90: typedef struct {
91: int nentries;
1.78 provos 92: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 93: } Idtab;
94:
95: /* private key table, one per protocol version */
96: Idtab idtable[3];
1.1 deraadt 97:
98: int max_fd = 0;
99:
1.11 markus 100: /* pid of shell == parent of agent */
1.29 deraadt 101: pid_t parent_pid = -1;
1.10 markus 102:
103: /* pathname and directory for AUTH_SOCKET */
104: char socket_name[1024];
105: char socket_dir[1024];
106:
1.88 markus 107: /* locking */
108: int locked = 0;
109: char *lock_passwd = NULL;
110:
1.20 markus 111: extern char *__progname;
112:
1.106 marc 113: /* Default lifetime (0 == forever) */
114: static int lifetime = 0;
115:
1.55 itojun 116: static void
1.101 stevesk 117: close_socket(SocketEntry *e)
118: {
119: close(e->fd);
120: e->fd = -1;
121: e->type = AUTH_UNUSED;
122: buffer_free(&e->input);
123: buffer_free(&e->output);
124: buffer_free(&e->request);
125: }
126:
127: static void
1.33 markus 128: idtab_init(void)
1.1 deraadt 129: {
1.33 markus 130: int i;
1.96 deraadt 131:
1.74 deraadt 132: for (i = 0; i <=2; i++) {
1.78 provos 133: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 134: idtable[i].nentries = 0;
135: }
136: }
137:
138: /* return private key table for requested protocol version */
1.55 itojun 139: static Idtab *
1.33 markus 140: idtab_lookup(int version)
141: {
142: if (version < 1 || version > 2)
143: fatal("internal error, bad protocol version %d", version);
144: return &idtable[version];
145: }
146:
1.89 markus 147: static void
148: free_identity(Identity *id)
149: {
150: key_free(id->key);
151: xfree(id->comment);
152: xfree(id);
153: }
154:
1.33 markus 155: /* return matching private key for given public key */
1.78 provos 156: static Identity *
157: lookup_identity(Key *key, int version)
1.33 markus 158: {
1.78 provos 159: Identity *id;
160:
1.33 markus 161: Idtab *tab = idtab_lookup(version);
1.78 provos 162: TAILQ_FOREACH(id, &tab->idlist, next) {
163: if (key_equal(key, id->key))
164: return (id);
1.33 markus 165: }
1.78 provos 166: return (NULL);
167: }
168:
1.107 markus 169: /* Check confirmation of keysign request */
170: static int
171: confirm_key(Identity *id)
172: {
1.122 djm 173: char *p;
1.107 markus 174: int ret = -1;
175:
176: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 177: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
178: id->comment, p))
179: ret = 0;
1.107 markus 180: xfree(p);
1.122 djm 181:
1.107 markus 182: return (ret);
183: }
184:
1.33 markus 185: /* send list of supported public keys to 'client' */
1.55 itojun 186: static void
1.33 markus 187: process_request_identities(SocketEntry *e, int version)
188: {
189: Idtab *tab = idtab_lookup(version);
1.96 deraadt 190: Identity *id;
1.21 markus 191: Buffer msg;
1.1 deraadt 192:
1.21 markus 193: buffer_init(&msg);
1.33 markus 194: buffer_put_char(&msg, (version == 1) ?
195: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
196: buffer_put_int(&msg, tab->nentries);
1.78 provos 197: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 198: if (id->key->type == KEY_RSA1) {
1.33 markus 199: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
200: buffer_put_bignum(&msg, id->key->rsa->e);
201: buffer_put_bignum(&msg, id->key->rsa->n);
202: } else {
1.45 markus 203: u_char *blob;
204: u_int blen;
1.39 markus 205: key_to_blob(id->key, &blob, &blen);
1.33 markus 206: buffer_put_string(&msg, blob, blen);
207: xfree(blob);
208: }
209: buffer_put_cstring(&msg, id->comment);
1.21 markus 210: }
211: buffer_put_int(&e->output, buffer_len(&msg));
212: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
213: buffer_free(&msg);
1.1 deraadt 214: }
215:
1.33 markus 216: /* ssh1 only */
1.55 itojun 217: static void
1.33 markus 218: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 219: {
1.96 deraadt 220: u_char buf[32], mdbuf[16], session_id[16];
221: u_int response_type;
222: BIGNUM *challenge;
1.78 provos 223: Identity *id;
1.33 markus 224: int i, len;
1.21 markus 225: Buffer msg;
226: MD5_CTX md;
1.96 deraadt 227: Key *key;
1.21 markus 228:
229: buffer_init(&msg);
1.39 markus 230: key = key_new(KEY_RSA1);
1.76 markus 231: if ((challenge = BN_new()) == NULL)
232: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 233:
1.97 markus 234: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 235: buffer_get_bignum(&e->request, key->rsa->e);
236: buffer_get_bignum(&e->request, key->rsa->n);
237: buffer_get_bignum(&e->request, challenge);
1.21 markus 238:
1.33 markus 239: /* Only protocol 1.1 is supported */
1.87 markus 240: if (buffer_len(&e->request) == 0)
1.33 markus 241: goto failure;
1.87 markus 242: buffer_get(&e->request, session_id, 16);
243: response_type = buffer_get_int(&e->request);
1.33 markus 244: if (response_type != 1)
245: goto failure;
246:
1.78 provos 247: id = lookup_identity(key, 1);
1.107 markus 248: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 249: Key *private = id->key;
1.33 markus 250: /* Decrypt the challenge using the private key. */
1.49 markus 251: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
252: goto failure;
1.33 markus 253:
254: /* The response is MD5 of decrypted challenge plus session id. */
255: len = BN_num_bytes(challenge);
256: if (len <= 0 || len > 32) {
1.109 itojun 257: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 258: goto failure;
259: }
260: memset(buf, 0, 32);
261: BN_bn2bin(challenge, buf + 32 - len);
262: MD5_Init(&md);
263: MD5_Update(&md, buf, 32);
264: MD5_Update(&md, session_id, 16);
265: MD5_Final(mdbuf, &md);
266:
267: /* Send the response. */
268: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
269: for (i = 0; i < 16; i++)
270: buffer_put_char(&msg, mdbuf[i]);
271: goto send;
272: }
1.21 markus 273:
1.33 markus 274: failure:
275: /* Unknown identity or protocol error. Send failure. */
1.21 markus 276: buffer_put_char(&msg, SSH_AGENT_FAILURE);
277: send:
278: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 279: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
280: key_free(key);
281: BN_clear_free(challenge);
282: buffer_free(&msg);
283: }
284:
285: /* ssh2 only */
1.55 itojun 286: static void
1.33 markus 287: process_sign_request2(SocketEntry *e)
288: {
1.45 markus 289: u_char *blob, *data, *signature = NULL;
290: u_int blen, dlen, slen = 0;
1.96 deraadt 291: extern int datafellows;
292: int ok = -1, flags;
1.33 markus 293: Buffer msg;
1.96 deraadt 294: Key *key;
1.33 markus 295:
296: datafellows = 0;
1.43 markus 297:
1.87 markus 298: blob = buffer_get_string(&e->request, &blen);
299: data = buffer_get_string(&e->request, &dlen);
1.37 markus 300:
1.87 markus 301: flags = buffer_get_int(&e->request);
1.37 markus 302: if (flags & SSH_AGENT_OLD_SIGNATURE)
303: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 304:
1.39 markus 305: key = key_from_blob(blob, blen);
1.33 markus 306: if (key != NULL) {
1.78 provos 307: Identity *id = lookup_identity(key, 2);
1.107 markus 308: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 309: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.33 markus 310: }
311: key_free(key);
312: buffer_init(&msg);
313: if (ok == 0) {
314: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
315: buffer_put_string(&msg, signature, slen);
316: } else {
317: buffer_put_char(&msg, SSH_AGENT_FAILURE);
318: }
319: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 320: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 321: buffer_len(&msg));
1.21 markus 322: buffer_free(&msg);
1.33 markus 323: xfree(data);
324: xfree(blob);
325: if (signature != NULL)
326: xfree(signature);
1.1 deraadt 327: }
328:
1.33 markus 329: /* shared */
1.55 itojun 330: static void
1.33 markus 331: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 332: {
1.96 deraadt 333: u_int blen, bits;
334: int success = 0;
1.78 provos 335: Key *key = NULL;
1.45 markus 336: u_char *blob;
1.21 markus 337:
1.74 deraadt 338: switch (version) {
1.33 markus 339: case 1:
1.39 markus 340: key = key_new(KEY_RSA1);
1.87 markus 341: bits = buffer_get_int(&e->request);
342: buffer_get_bignum(&e->request, key->rsa->e);
343: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 344:
345: if (bits != key_size(key))
1.109 itojun 346: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 347: key_size(key), bits);
1.33 markus 348: break;
349: case 2:
1.87 markus 350: blob = buffer_get_string(&e->request, &blen);
1.39 markus 351: key = key_from_blob(blob, blen);
1.33 markus 352: xfree(blob);
353: break;
354: }
355: if (key != NULL) {
1.78 provos 356: Identity *id = lookup_identity(key, version);
357: if (id != NULL) {
1.23 markus 358: /*
359: * We have this key. Free the old key. Since we
1.124 djm 360: * don't want to leave empty slots in the middle of
1.40 markus 361: * the array, we actually free the key there and move
362: * all the entries between the empty slot and the end
363: * of the array.
1.23 markus 364: */
1.33 markus 365: Idtab *tab = idtab_lookup(version);
1.38 markus 366: if (tab->nentries < 1)
367: fatal("process_remove_identity: "
368: "internal error: tab->nentries %d",
369: tab->nentries);
1.78 provos 370: TAILQ_REMOVE(&tab->idlist, id, next);
371: free_identity(id);
1.33 markus 372: tab->nentries--;
373: success = 1;
1.21 markus 374: }
1.33 markus 375: key_free(key);
376: }
1.1 deraadt 377: buffer_put_int(&e->output, 1);
1.33 markus 378: buffer_put_char(&e->output,
379: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 380: }
381:
1.55 itojun 382: static void
1.33 markus 383: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 384: {
1.33 markus 385: Idtab *tab = idtab_lookup(version);
1.78 provos 386: Identity *id;
1.21 markus 387:
388: /* Loop over all identities and clear the keys. */
1.78 provos 389: for (id = TAILQ_FIRST(&tab->idlist); id;
390: id = TAILQ_FIRST(&tab->idlist)) {
391: TAILQ_REMOVE(&tab->idlist, id, next);
392: free_identity(id);
1.21 markus 393: }
394:
395: /* Mark that there are no identities. */
1.33 markus 396: tab->nentries = 0;
1.21 markus 397:
398: /* Send success. */
399: buffer_put_int(&e->output, 1);
400: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 401: }
402:
1.55 itojun 403: static void
1.89 markus 404: reaper(void)
405: {
1.96 deraadt 406: u_int now = time(NULL);
1.89 markus 407: Identity *id, *nxt;
408: int version;
1.96 deraadt 409: Idtab *tab;
1.89 markus 410:
411: for (version = 1; version < 3; version++) {
412: tab = idtab_lookup(version);
413: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
414: nxt = TAILQ_NEXT(id, next);
415: if (id->death != 0 && now >= id->death) {
416: TAILQ_REMOVE(&tab->idlist, id, next);
417: free_identity(id);
418: tab->nentries--;
419: }
420: }
421: }
422: }
423:
424: static void
1.33 markus 425: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 426: {
1.96 deraadt 427: Idtab *tab = idtab_lookup(version);
1.107 markus 428: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 429: char *type_name, *comment;
1.33 markus 430: Key *k = NULL;
431:
432: switch (version) {
433: case 1:
1.39 markus 434: k = key_new_private(KEY_RSA1);
1.97 markus 435: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 436: buffer_get_bignum(&e->request, k->rsa->n);
437: buffer_get_bignum(&e->request, k->rsa->e);
438: buffer_get_bignum(&e->request, k->rsa->d);
439: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 440:
441: /* SSH and SSL have p and q swapped */
1.87 markus 442: buffer_get_bignum(&e->request, k->rsa->q); /* p */
443: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 444:
445: /* Generate additional parameters */
1.60 markus 446: rsa_generate_additional_parameters(k->rsa);
1.33 markus 447: break;
448: case 2:
1.87 markus 449: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 450: type = key_type_from_name(type_name);
1.39 markus 451: xfree(type_name);
1.74 deraadt 452: switch (type) {
1.39 markus 453: case KEY_DSA:
454: k = key_new_private(type);
1.87 markus 455: buffer_get_bignum2(&e->request, k->dsa->p);
456: buffer_get_bignum2(&e->request, k->dsa->q);
457: buffer_get_bignum2(&e->request, k->dsa->g);
458: buffer_get_bignum2(&e->request, k->dsa->pub_key);
459: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 460: break;
461: case KEY_RSA:
462: k = key_new_private(type);
1.87 markus 463: buffer_get_bignum2(&e->request, k->rsa->n);
464: buffer_get_bignum2(&e->request, k->rsa->e);
465: buffer_get_bignum2(&e->request, k->rsa->d);
466: buffer_get_bignum2(&e->request, k->rsa->iqmp);
467: buffer_get_bignum2(&e->request, k->rsa->p);
468: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 469:
470: /* Generate additional parameters */
1.60 markus 471: rsa_generate_additional_parameters(k->rsa);
1.39 markus 472: break;
473: default:
1.87 markus 474: buffer_clear(&e->request);
1.108 markus 475: goto send;
476: }
477: break;
478: }
479: /* enable blinding */
480: switch (k->type) {
481: case KEY_RSA:
482: case KEY_RSA1:
483: if (RSA_blinding_on(k->rsa, NULL) != 1) {
484: error("process_add_identity: RSA_blinding_on failed");
485: key_free(k);
1.33 markus 486: goto send;
1.21 markus 487: }
1.33 markus 488: break;
489: }
1.87 markus 490: comment = buffer_get_string(&e->request, NULL);
1.33 markus 491: if (k == NULL) {
492: xfree(comment);
493: goto send;
494: }
495: success = 1;
1.94 markus 496: while (buffer_len(&e->request)) {
497: switch (buffer_get_char(&e->request)) {
498: case SSH_AGENT_CONSTRAIN_LIFETIME:
499: death = time(NULL) + buffer_get_int(&e->request);
500: break;
1.107 markus 501: case SSH_AGENT_CONSTRAIN_CONFIRM:
502: confirm = 1;
503: break;
1.94 markus 504: default:
505: break;
506: }
507: }
1.106 marc 508: if (lifetime && !death)
509: death = time(NULL) + lifetime;
1.78 provos 510: if (lookup_identity(k, version) == NULL) {
511: Identity *id = xmalloc(sizeof(Identity));
512: id->key = k;
513: id->comment = comment;
1.94 markus 514: id->death = death;
1.107 markus 515: id->confirm = confirm;
1.78 provos 516: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 517: /* Increment the number of identities. */
518: tab->nentries++;
519: } else {
520: key_free(k);
521: xfree(comment);
522: }
523: send:
1.1 deraadt 524: buffer_put_int(&e->output, 1);
1.33 markus 525: buffer_put_char(&e->output,
526: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 527: }
528:
1.88 markus 529: /* XXX todo: encrypt sensitive data with passphrase */
530: static void
531: process_lock_agent(SocketEntry *e, int lock)
532: {
1.96 deraadt 533: int success = 0;
1.88 markus 534: char *passwd;
535:
536: passwd = buffer_get_string(&e->request, NULL);
537: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
538: locked = 0;
539: memset(lock_passwd, 0, strlen(lock_passwd));
540: xfree(lock_passwd);
541: lock_passwd = NULL;
542: success = 1;
543: } else if (!locked && lock) {
544: locked = 1;
545: lock_passwd = xstrdup(passwd);
546: success = 1;
547: }
548: memset(passwd, 0, strlen(passwd));
549: xfree(passwd);
1.95 deraadt 550:
1.88 markus 551: buffer_put_int(&e->output, 1);
552: buffer_put_char(&e->output,
553: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
554: }
555:
556: static void
557: no_identities(SocketEntry *e, u_int type)
558: {
559: Buffer msg;
560:
561: buffer_init(&msg);
562: buffer_put_char(&msg,
563: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
564: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
565: buffer_put_int(&msg, 0);
566: buffer_put_int(&e->output, buffer_len(&msg));
567: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
568: buffer_free(&msg);
569: }
1.59 markus 570:
571: #ifdef SMARTCARD
572: static void
573: process_add_smartcard_key (SocketEntry *e)
574: {
1.96 deraadt 575: char *sc_reader_id = NULL, *pin;
1.110 djm 576: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 577: Key **keys, *k;
1.84 markus 578: Identity *id;
1.59 markus 579: Idtab *tab;
1.75 deraadt 580:
1.87 markus 581: sc_reader_id = buffer_get_string(&e->request, NULL);
582: pin = buffer_get_string(&e->request, NULL);
1.110 djm 583:
584: while (buffer_len(&e->request)) {
585: switch (buffer_get_char(&e->request)) {
586: case SSH_AGENT_CONSTRAIN_LIFETIME:
587: death = time(NULL) + buffer_get_int(&e->request);
588: break;
589: case SSH_AGENT_CONSTRAIN_CONFIRM:
590: confirm = 1;
591: break;
592: default:
593: break;
594: }
595: }
596: if (lifetime && !death)
597: death = time(NULL) + lifetime;
598:
1.84 markus 599: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 600: xfree(sc_reader_id);
1.83 rees 601: xfree(pin);
1.59 markus 602:
1.84 markus 603: if (keys == NULL || keys[0] == NULL) {
604: error("sc_get_keys failed");
1.59 markus 605: goto send;
606: }
1.84 markus 607: for (i = 0; keys[i] != NULL; i++) {
608: k = keys[i];
609: version = k->type == KEY_RSA1 ? 1 : 2;
610: tab = idtab_lookup(version);
611: if (lookup_identity(k, version) == NULL) {
612: id = xmalloc(sizeof(Identity));
613: id->key = k;
1.111 markus 614: id->comment = sc_get_key_label(k);
1.110 djm 615: id->death = death;
616: id->confirm = confirm;
1.84 markus 617: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
618: tab->nentries++;
619: success = 1;
620: } else {
621: key_free(k);
622: }
623: keys[i] = NULL;
1.59 markus 624: }
1.84 markus 625: xfree(keys);
1.59 markus 626: send:
627: buffer_put_int(&e->output, 1);
628: buffer_put_char(&e->output,
629: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
630: }
631:
632: static void
633: process_remove_smartcard_key(SocketEntry *e)
634: {
1.96 deraadt 635: char *sc_reader_id = NULL, *pin;
636: int i, version, success = 0;
637: Key **keys, *k = NULL;
1.84 markus 638: Identity *id;
639: Idtab *tab;
1.59 markus 640:
1.87 markus 641: sc_reader_id = buffer_get_string(&e->request, NULL);
642: pin = buffer_get_string(&e->request, NULL);
1.84 markus 643: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 644: xfree(sc_reader_id);
1.83 rees 645: xfree(pin);
1.59 markus 646:
1.84 markus 647: if (keys == NULL || keys[0] == NULL) {
648: error("sc_get_keys failed");
649: goto send;
650: }
651: for (i = 0; keys[i] != NULL; i++) {
652: k = keys[i];
653: version = k->type == KEY_RSA1 ? 1 : 2;
654: if ((id = lookup_identity(k, version)) != NULL) {
655: tab = idtab_lookup(version);
1.90 markus 656: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 657: tab->nentries--;
1.78 provos 658: free_identity(id);
1.59 markus 659: success = 1;
660: }
661: key_free(k);
1.84 markus 662: keys[i] = NULL;
1.59 markus 663: }
1.84 markus 664: xfree(keys);
665: send:
1.59 markus 666: buffer_put_int(&e->output, 1);
667: buffer_put_char(&e->output,
668: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
669: }
1.70 jakob 670: #endif /* SMARTCARD */
1.59 markus 671:
1.33 markus 672: /* dispatch incoming messages */
673:
1.55 itojun 674: static void
1.2 provos 675: process_message(SocketEntry *e)
1.1 deraadt 676: {
1.96 deraadt 677: u_int msg_len, type;
1.45 markus 678: u_char *cp;
1.89 markus 679:
680: /* kill dead keys */
681: reaper();
682:
1.21 markus 683: if (buffer_len(&e->input) < 5)
684: return; /* Incomplete message. */
1.77 stevesk 685: cp = buffer_ptr(&e->input);
1.21 markus 686: msg_len = GET_32BIT(cp);
687: if (msg_len > 256 * 1024) {
1.101 stevesk 688: close_socket(e);
1.21 markus 689: return;
690: }
691: if (buffer_len(&e->input) < msg_len + 4)
692: return;
1.87 markus 693:
694: /* move the current input to e->request */
1.21 markus 695: buffer_consume(&e->input, 4);
1.87 markus 696: buffer_clear(&e->request);
697: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
698: buffer_consume(&e->input, msg_len);
699: type = buffer_get_char(&e->request);
1.21 markus 700:
1.88 markus 701: /* check wheter agent is locked */
702: if (locked && type != SSH_AGENTC_UNLOCK) {
703: buffer_clear(&e->request);
704: switch (type) {
705: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
706: case SSH2_AGENTC_REQUEST_IDENTITIES:
707: /* send empty lists */
708: no_identities(e, type);
709: break;
710: default:
711: /* send a fail message for all other request types */
712: buffer_put_int(&e->output, 1);
713: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
714: }
715: return;
716: }
717:
1.59 markus 718: debug("type %d", type);
1.21 markus 719: switch (type) {
1.88 markus 720: case SSH_AGENTC_LOCK:
721: case SSH_AGENTC_UNLOCK:
722: process_lock_agent(e, type == SSH_AGENTC_LOCK);
723: break;
1.33 markus 724: /* ssh1 */
725: case SSH_AGENTC_RSA_CHALLENGE:
726: process_authentication_challenge1(e);
727: break;
1.21 markus 728: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 729: process_request_identities(e, 1);
1.21 markus 730: break;
731: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 732: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 733: process_add_identity(e, 1);
1.21 markus 734: break;
735: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 736: process_remove_identity(e, 1);
1.21 markus 737: break;
738: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 739: process_remove_all_identities(e, 1);
740: break;
741: /* ssh2 */
742: case SSH2_AGENTC_SIGN_REQUEST:
743: process_sign_request2(e);
744: break;
745: case SSH2_AGENTC_REQUEST_IDENTITIES:
746: process_request_identities(e, 2);
747: break;
748: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 749: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 750: process_add_identity(e, 2);
751: break;
752: case SSH2_AGENTC_REMOVE_IDENTITY:
753: process_remove_identity(e, 2);
754: break;
755: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
756: process_remove_all_identities(e, 2);
1.21 markus 757: break;
1.59 markus 758: #ifdef SMARTCARD
759: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 760: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 761: process_add_smartcard_key(e);
1.75 deraadt 762: break;
1.59 markus 763: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
764: process_remove_smartcard_key(e);
1.75 deraadt 765: break;
1.70 jakob 766: #endif /* SMARTCARD */
1.21 markus 767: default:
768: /* Unknown message. Respond with failure. */
769: error("Unknown message %d", type);
1.87 markus 770: buffer_clear(&e->request);
1.21 markus 771: buffer_put_int(&e->output, 1);
772: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
773: break;
774: }
1.1 deraadt 775: }
776:
1.55 itojun 777: static void
1.73 stevesk 778: new_socket(sock_type type, int fd)
1.1 deraadt 779: {
1.112 markus 780: u_int i, old_alloc, new_alloc;
1.96 deraadt 781:
1.119 djm 782: set_nonblock(fd);
1.21 markus 783:
784: if (fd > max_fd)
785: max_fd = fd;
786:
787: for (i = 0; i < sockets_alloc; i++)
788: if (sockets[i].type == AUTH_UNUSED) {
789: sockets[i].fd = fd;
790: buffer_init(&sockets[i].input);
791: buffer_init(&sockets[i].output);
1.87 markus 792: buffer_init(&sockets[i].request);
1.112 markus 793: sockets[i].type = type;
1.21 markus 794: return;
795: }
796: old_alloc = sockets_alloc;
1.112 markus 797: new_alloc = sockets_alloc + 10;
1.21 markus 798: if (sockets)
1.112 markus 799: sockets = xrealloc(sockets, new_alloc * sizeof(sockets[0]));
1.21 markus 800: else
1.112 markus 801: sockets = xmalloc(new_alloc * sizeof(sockets[0]));
802: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 803: sockets[i].type = AUTH_UNUSED;
1.112 markus 804: sockets_alloc = new_alloc;
1.21 markus 805: sockets[old_alloc].fd = fd;
806: buffer_init(&sockets[old_alloc].input);
807: buffer_init(&sockets[old_alloc].output);
1.87 markus 808: buffer_init(&sockets[old_alloc].request);
1.112 markus 809: sockets[old_alloc].type = type;
1.1 deraadt 810: }
811:
1.55 itojun 812: static int
1.120 avsm 813: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 814: {
1.46 markus 815: u_int i, sz;
816: int n = 0;
817:
818: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 819: switch (sockets[i].type) {
820: case AUTH_SOCKET:
821: case AUTH_CONNECTION:
1.46 markus 822: n = MAX(n, sockets[i].fd);
1.21 markus 823: break;
824: case AUTH_UNUSED:
825: break;
826: default:
827: fatal("Unknown socket type %d", sockets[i].type);
828: break;
829: }
1.46 markus 830: }
831:
832: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 833: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 834: if (*fdrp)
1.54 stevesk 835: xfree(*fdrp);
1.46 markus 836: if (*fdwp)
1.54 stevesk 837: xfree(*fdwp);
1.46 markus 838: *fdrp = xmalloc(sz);
839: *fdwp = xmalloc(sz);
1.66 markus 840: *nallocp = sz;
1.46 markus 841: }
1.66 markus 842: if (n < *fdl)
843: debug("XXX shrink: %d < %d", n, *fdl);
844: *fdl = n;
1.46 markus 845: memset(*fdrp, 0, sz);
846: memset(*fdwp, 0, sz);
847:
848: for (i = 0; i < sockets_alloc; i++) {
849: switch (sockets[i].type) {
850: case AUTH_SOCKET:
851: case AUTH_CONNECTION:
852: FD_SET(sockets[i].fd, *fdrp);
853: if (buffer_len(&sockets[i].output) > 0)
854: FD_SET(sockets[i].fd, *fdwp);
855: break;
856: default:
857: break;
858: }
859: }
860: return (1);
1.21 markus 861: }
862:
1.55 itojun 863: static void
1.21 markus 864: after_select(fd_set *readset, fd_set *writeset)
865: {
1.96 deraadt 866: struct sockaddr_un sunaddr;
1.26 markus 867: socklen_t slen;
1.21 markus 868: char buf[1024];
1.96 deraadt 869: int len, sock;
870: u_int i;
1.103 markus 871: uid_t euid;
872: gid_t egid;
1.21 markus 873:
874: for (i = 0; i < sockets_alloc; i++)
875: switch (sockets[i].type) {
876: case AUTH_UNUSED:
877: break;
878: case AUTH_SOCKET:
879: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 880: slen = sizeof(sunaddr);
1.46 markus 881: sock = accept(sockets[i].fd,
882: (struct sockaddr *) &sunaddr, &slen);
1.21 markus 883: if (sock < 0) {
1.81 stevesk 884: error("accept from AUTH_SOCKET: %s",
885: strerror(errno));
1.103 markus 886: break;
887: }
888: if (getpeereid(sock, &euid, &egid) < 0) {
889: error("getpeereid %d failed: %s",
890: sock, strerror(errno));
891: close(sock);
892: break;
893: }
1.105 markus 894: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 895: error("uid mismatch: "
1.104 stevesk 896: "peer euid %u != uid %u",
897: (u_int) euid, (u_int) getuid());
1.103 markus 898: close(sock);
1.21 markus 899: break;
900: }
901: new_socket(AUTH_CONNECTION, sock);
902: }
903: break;
904: case AUTH_CONNECTION:
905: if (buffer_len(&sockets[i].output) > 0 &&
906: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 907: do {
908: len = write(sockets[i].fd,
909: buffer_ptr(&sockets[i].output),
910: buffer_len(&sockets[i].output));
911: if (len == -1 && (errno == EAGAIN ||
912: errno == EINTR))
913: continue;
914: break;
915: } while (1);
1.21 markus 916: if (len <= 0) {
1.101 stevesk 917: close_socket(&sockets[i]);
1.21 markus 918: break;
919: }
920: buffer_consume(&sockets[i].output, len);
921: }
922: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 923: do {
924: len = read(sockets[i].fd, buf, sizeof(buf));
925: if (len == -1 && (errno == EAGAIN ||
926: errno == EINTR))
927: continue;
928: break;
929: } while (1);
1.21 markus 930: if (len <= 0) {
1.101 stevesk 931: close_socket(&sockets[i]);
1.21 markus 932: break;
933: }
934: buffer_append(&sockets[i].input, buf, len);
935: process_message(&sockets[i]);
936: }
937: break;
938: default:
939: fatal("Unknown type %d", sockets[i].type);
940: }
1.1 deraadt 941: }
942:
1.55 itojun 943: static void
1.113 markus 944: cleanup_socket(void)
1.15 markus 945: {
1.48 deraadt 946: if (socket_name[0])
947: unlink(socket_name);
948: if (socket_dir[0])
949: rmdir(socket_dir);
1.10 markus 950: }
951:
1.114 markus 952: void
1.15 markus 953: cleanup_exit(int i)
954: {
1.113 markus 955: cleanup_socket();
956: _exit(i);
1.15 markus 957: }
958:
1.55 itojun 959: static void
1.48 deraadt 960: cleanup_handler(int sig)
961: {
1.113 markus 962: cleanup_socket();
1.48 deraadt 963: _exit(2);
1.113 markus 964: }
965:
1.68 markus 966: static void
967: check_parent_exists(int sig)
968: {
969: int save_errno = errno;
970:
971: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
972: /* printf("Parent has died - Authentication agent exiting.\n"); */
973: cleanup_handler(sig); /* safe */
974: }
975: signal(SIGALRM, check_parent_exists);
976: alarm(10);
977: errno = save_errno;
1.48 deraadt 978: }
979:
1.55 itojun 980: static void
1.50 itojun 981: usage(void)
1.15 markus 982: {
1.72 jakob 983: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 984: __progname);
1.72 jakob 985: fprintf(stderr, "Options:\n");
986: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
987: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
988: fprintf(stderr, " -k Kill the current agent.\n");
989: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 990: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 991: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 992: exit(1);
1.15 markus 993: }
994:
1.2 provos 995: int
996: main(int ac, char **av)
1.1 deraadt 997: {
1.107 markus 998: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.120 avsm 999: int sock, fd, ch;
1000: u_int nalloc;
1.96 deraadt 1001: char *shell, *format, *pidstr, *agentsocket = NULL;
1002: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1003: struct sockaddr_un sunaddr;
1.41 markus 1004: struct rlimit rlim;
1.96 deraadt 1005: extern int optind;
1.98 stevesk 1006: extern char *optarg;
1.21 markus 1007: pid_t pid;
1.96 deraadt 1008: char pidstrbuf[1 + 3 * sizeof pid];
1.123 djm 1009:
1010: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1011: sanitise_stdfd();
1.99 markus 1012:
1013: /* drop */
1014: setegid(getgid());
1015: setgid(getgid());
1.53 markus 1016:
1017: SSLeay_add_all_algorithms();
1.21 markus 1018:
1.106 marc 1019: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1020: switch (ch) {
1021: case 'c':
1022: if (s_flag)
1023: usage();
1024: c_flag++;
1025: break;
1026: case 'k':
1027: k_flag++;
1028: break;
1029: case 's':
1030: if (c_flag)
1031: usage();
1032: s_flag++;
1033: break;
1.57 markus 1034: case 'd':
1035: if (d_flag)
1036: usage();
1037: d_flag++;
1038: break;
1.86 markus 1039: case 'a':
1040: agentsocket = optarg;
1.106 marc 1041: break;
1042: case 't':
1043: if ((lifetime = convtime(optarg)) == -1) {
1044: fprintf(stderr, "Invalid lifetime\n");
1045: usage();
1046: }
1.86 markus 1047: break;
1.21 markus 1048: default:
1049: usage();
1050: }
1051: }
1052: ac -= optind;
1053: av += optind;
1054:
1.57 markus 1055: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1056: usage();
1057:
1.85 markus 1058: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1059: shell = getenv("SHELL");
1060: if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1061: c_flag = 1;
1062: }
1063: if (k_flag) {
1064: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1065: if (pidstr == NULL) {
1066: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1067: SSH_AGENTPID_ENV_NAME);
1.21 markus 1068: exit(1);
1069: }
1070: pid = atoi(pidstr);
1.46 markus 1071: if (pid < 1) {
1.21 markus 1072: fprintf(stderr, "%s=\"%s\", which is not a good PID\n",
1.46 markus 1073: SSH_AGENTPID_ENV_NAME, pidstr);
1.21 markus 1074: exit(1);
1075: }
1076: if (kill(pid, SIGTERM) == -1) {
1077: perror("kill");
1078: exit(1);
1079: }
1080: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1081: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1082: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1083: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1084: exit(0);
1085: }
1086: parent_pid = getpid();
1087:
1.86 markus 1088: if (agentsocket == NULL) {
1089: /* Create private directory for agent socket */
1.115 markus 1090: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1091: if (mkdtemp(socket_dir) == NULL) {
1092: perror("mkdtemp: private socket dir");
1093: exit(1);
1094: }
1.91 mpech 1095: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1096: (long)parent_pid);
1.86 markus 1097: } else {
1098: /* Try to use specified agent socket */
1099: socket_dir[0] = '\0';
1100: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1101: }
1102:
1.23 markus 1103: /*
1104: * Create socket early so it will exist before command gets run from
1105: * the parent.
1106: */
1.21 markus 1107: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1108: if (sock < 0) {
1109: perror("socket");
1.121 djm 1110: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1111: cleanup_exit(1);
1112: }
1113: memset(&sunaddr, 0, sizeof(sunaddr));
1114: sunaddr.sun_family = AF_UNIX;
1115: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1116: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) {
1117: perror("bind");
1.121 djm 1118: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1119: cleanup_exit(1);
1120: }
1.117 markus 1121: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1122: perror("listen");
1123: cleanup_exit(1);
1124: }
1.46 markus 1125:
1.23 markus 1126: /*
1127: * Fork, and have the parent execute the command, if any, or present
1128: * the socket data. The child continues as the authentication agent.
1129: */
1.57 markus 1130: if (d_flag) {
1131: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1132: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1133: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1134: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1135: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1136: goto skip;
1137: }
1.21 markus 1138: pid = fork();
1139: if (pid == -1) {
1140: perror("fork");
1.81 stevesk 1141: cleanup_exit(1);
1.21 markus 1142: }
1143: if (pid != 0) { /* Parent - execute the given command. */
1144: close(sock);
1.91 mpech 1145: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1146: if (ac == 0) {
1147: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1148: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1149: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1150: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1151: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1152: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1153: exit(0);
1154: }
1.36 deraadt 1155: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1156: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1157: perror("setenv");
1158: exit(1);
1159: }
1.21 markus 1160: execvp(av[0], av);
1161: perror(av[0]);
1162: exit(1);
1163: }
1.81 stevesk 1164: /* child */
1165: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1166:
1167: if (setsid() == -1) {
1.81 stevesk 1168: error("setsid: %s", strerror(errno));
1.67 stevesk 1169: cleanup_exit(1);
1170: }
1171:
1172: (void)chdir("/");
1.107 markus 1173: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1174: /* XXX might close listen socket */
1175: (void)dup2(fd, STDIN_FILENO);
1176: (void)dup2(fd, STDOUT_FILENO);
1177: (void)dup2(fd, STDERR_FILENO);
1178: if (fd > 2)
1179: close(fd);
1180: }
1.21 markus 1181:
1.41 markus 1182: /* deny core dumps, since memory contains unencrypted private keys */
1183: rlim.rlim_cur = rlim.rlim_max = 0;
1184: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1185: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1186: cleanup_exit(1);
1187: }
1.57 markus 1188:
1189: skip:
1.21 markus 1190: new_socket(AUTH_SOCKET, sock);
1191: if (ac > 0) {
1192: signal(SIGALRM, check_parent_exists);
1193: alarm(10);
1194: }
1.33 markus 1195: idtab_init();
1.61 markus 1196: if (!d_flag)
1.57 markus 1197: signal(SIGINT, SIG_IGN);
1.61 markus 1198: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1199: signal(SIGHUP, cleanup_handler);
1200: signal(SIGTERM, cleanup_handler);
1.66 markus 1201: nalloc = 0;
1202:
1.21 markus 1203: while (1) {
1.66 markus 1204: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1205: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1206: if (errno == EINTR)
1207: continue;
1.81 stevesk 1208: fatal("select: %s", strerror(errno));
1.21 markus 1209: }
1.46 markus 1210: after_select(readsetp, writesetp);
1.15 markus 1211: }
1.21 markus 1212: /* NOTREACHED */
1.1 deraadt 1213: }
![[BACK]](/icons/back.gif){kind=icon}
Return to ssh-agent.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh