Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.146
1.146 ! stevesk 1: /* $OpenBSD: ssh-agent.c,v 1.145 2006/07/22 19:08:54 stevesk Exp $ */
1.1 deraadt 2: /*
1.22 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * The authentication agent program.
1.33 markus 7: *
1.35 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
1.56 markus 14: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.35 deraadt 15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.22 deraadt 35: */
1.1 deraadt 36:
37: #include "includes.h"
1.125 stevesk 38:
1.78 provos 39: #include <sys/queue.h>
1.127 stevesk 40: #include <sys/resource.h>
1.128 stevesk 41: #include <sys/types.h>
1.141 stevesk 42: #include <sys/socket.h>
1.128 stevesk 43: #include <sys/un.h>
1.126 stevesk 44:
1.146 ! stevesk 45: #include <openssl/evp.h>
! 46: #include <openssl/md5.h>
! 47:
1.143 stevesk 48: #include <errno.h>
1.142 stevesk 49: #include <fcntl.h>
1.126 stevesk 50: #include <paths.h>
1.129 stevesk 51: #include <signal.h>
1.146 ! stevesk 52: #include <string.h>
1.145 stevesk 53: #include <time.h>
1.144 stevesk 54: #include <unistd.h>
1.1 deraadt 55:
56: #include "ssh.h"
57: #include "rsa.h"
58: #include "buffer.h"
59: #include "bufaux.h"
60: #include "xmalloc.h"
1.32 markus 61: #include "key.h"
62: #include "authfd.h"
1.37 markus 63: #include "compat.h"
1.47 markus 64: #include "log.h"
1.107 markus 65: #include "misc.h"
1.7 deraadt 66:
1.59 markus 67: #ifdef SMARTCARD
68: #include "scard.h"
1.71 jakob 69: #endif
1.59 markus 70:
1.73 stevesk 71: typedef enum {
72: AUTH_UNUSED,
73: AUTH_SOCKET,
74: AUTH_CONNECTION
75: } sock_type;
76:
1.21 markus 77: typedef struct {
78: int fd;
1.73 stevesk 79: sock_type type;
1.21 markus 80: Buffer input;
81: Buffer output;
1.87 markus 82: Buffer request;
1.1 deraadt 83: } SocketEntry;
84:
1.45 markus 85: u_int sockets_alloc = 0;
1.1 deraadt 86: SocketEntry *sockets = NULL;
87:
1.78 provos 88: typedef struct identity {
89: TAILQ_ENTRY(identity) next;
1.33 markus 90: Key *key;
1.21 markus 91: char *comment;
1.89 markus 92: u_int death;
1.107 markus 93: u_int confirm;
1.1 deraadt 94: } Identity;
95:
1.33 markus 96: typedef struct {
97: int nentries;
1.78 provos 98: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 99: } Idtab;
100:
101: /* private key table, one per protocol version */
102: Idtab idtable[3];
1.1 deraadt 103:
104: int max_fd = 0;
105:
1.11 markus 106: /* pid of shell == parent of agent */
1.29 deraadt 107: pid_t parent_pid = -1;
1.10 markus 108:
109: /* pathname and directory for AUTH_SOCKET */
1.132 djm 110: char socket_name[MAXPATHLEN];
111: char socket_dir[MAXPATHLEN];
1.10 markus 112:
1.88 markus 113: /* locking */
114: int locked = 0;
115: char *lock_passwd = NULL;
116:
1.20 markus 117: extern char *__progname;
118:
1.106 marc 119: /* Default lifetime (0 == forever) */
120: static int lifetime = 0;
121:
1.55 itojun 122: static void
1.101 stevesk 123: close_socket(SocketEntry *e)
124: {
125: close(e->fd);
126: e->fd = -1;
127: e->type = AUTH_UNUSED;
128: buffer_free(&e->input);
129: buffer_free(&e->output);
130: buffer_free(&e->request);
131: }
132:
133: static void
1.33 markus 134: idtab_init(void)
1.1 deraadt 135: {
1.33 markus 136: int i;
1.96 deraadt 137:
1.74 deraadt 138: for (i = 0; i <=2; i++) {
1.78 provos 139: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 140: idtable[i].nentries = 0;
141: }
142: }
143:
144: /* return private key table for requested protocol version */
1.55 itojun 145: static Idtab *
1.33 markus 146: idtab_lookup(int version)
147: {
148: if (version < 1 || version > 2)
149: fatal("internal error, bad protocol version %d", version);
150: return &idtable[version];
151: }
152:
1.89 markus 153: static void
154: free_identity(Identity *id)
155: {
156: key_free(id->key);
157: xfree(id->comment);
158: xfree(id);
159: }
160:
1.33 markus 161: /* return matching private key for given public key */
1.78 provos 162: static Identity *
163: lookup_identity(Key *key, int version)
1.33 markus 164: {
1.78 provos 165: Identity *id;
166:
1.33 markus 167: Idtab *tab = idtab_lookup(version);
1.78 provos 168: TAILQ_FOREACH(id, &tab->idlist, next) {
169: if (key_equal(key, id->key))
170: return (id);
1.33 markus 171: }
1.78 provos 172: return (NULL);
173: }
174:
1.107 markus 175: /* Check confirmation of keysign request */
176: static int
177: confirm_key(Identity *id)
178: {
1.122 djm 179: char *p;
1.107 markus 180: int ret = -1;
181:
182: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 183: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
184: id->comment, p))
185: ret = 0;
1.107 markus 186: xfree(p);
1.122 djm 187:
1.107 markus 188: return (ret);
189: }
190:
1.33 markus 191: /* send list of supported public keys to 'client' */
1.55 itojun 192: static void
1.33 markus 193: process_request_identities(SocketEntry *e, int version)
194: {
195: Idtab *tab = idtab_lookup(version);
1.96 deraadt 196: Identity *id;
1.21 markus 197: Buffer msg;
1.1 deraadt 198:
1.21 markus 199: buffer_init(&msg);
1.33 markus 200: buffer_put_char(&msg, (version == 1) ?
201: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
202: buffer_put_int(&msg, tab->nentries);
1.78 provos 203: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 204: if (id->key->type == KEY_RSA1) {
1.33 markus 205: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
206: buffer_put_bignum(&msg, id->key->rsa->e);
207: buffer_put_bignum(&msg, id->key->rsa->n);
208: } else {
1.45 markus 209: u_char *blob;
210: u_int blen;
1.39 markus 211: key_to_blob(id->key, &blob, &blen);
1.33 markus 212: buffer_put_string(&msg, blob, blen);
213: xfree(blob);
214: }
215: buffer_put_cstring(&msg, id->comment);
1.21 markus 216: }
217: buffer_put_int(&e->output, buffer_len(&msg));
218: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
219: buffer_free(&msg);
1.1 deraadt 220: }
221:
1.33 markus 222: /* ssh1 only */
1.55 itojun 223: static void
1.33 markus 224: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 225: {
1.96 deraadt 226: u_char buf[32], mdbuf[16], session_id[16];
227: u_int response_type;
228: BIGNUM *challenge;
1.78 provos 229: Identity *id;
1.33 markus 230: int i, len;
1.21 markus 231: Buffer msg;
232: MD5_CTX md;
1.96 deraadt 233: Key *key;
1.21 markus 234:
235: buffer_init(&msg);
1.39 markus 236: key = key_new(KEY_RSA1);
1.76 markus 237: if ((challenge = BN_new()) == NULL)
238: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 239:
1.97 markus 240: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 241: buffer_get_bignum(&e->request, key->rsa->e);
242: buffer_get_bignum(&e->request, key->rsa->n);
243: buffer_get_bignum(&e->request, challenge);
1.21 markus 244:
1.33 markus 245: /* Only protocol 1.1 is supported */
1.87 markus 246: if (buffer_len(&e->request) == 0)
1.33 markus 247: goto failure;
1.87 markus 248: buffer_get(&e->request, session_id, 16);
249: response_type = buffer_get_int(&e->request);
1.33 markus 250: if (response_type != 1)
251: goto failure;
252:
1.78 provos 253: id = lookup_identity(key, 1);
1.107 markus 254: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 255: Key *private = id->key;
1.33 markus 256: /* Decrypt the challenge using the private key. */
1.49 markus 257: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
258: goto failure;
1.33 markus 259:
260: /* The response is MD5 of decrypted challenge plus session id. */
261: len = BN_num_bytes(challenge);
262: if (len <= 0 || len > 32) {
1.109 itojun 263: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 264: goto failure;
265: }
266: memset(buf, 0, 32);
267: BN_bn2bin(challenge, buf + 32 - len);
268: MD5_Init(&md);
269: MD5_Update(&md, buf, 32);
270: MD5_Update(&md, session_id, 16);
271: MD5_Final(mdbuf, &md);
272:
273: /* Send the response. */
274: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
275: for (i = 0; i < 16; i++)
276: buffer_put_char(&msg, mdbuf[i]);
277: goto send;
278: }
1.21 markus 279:
1.33 markus 280: failure:
281: /* Unknown identity or protocol error. Send failure. */
1.21 markus 282: buffer_put_char(&msg, SSH_AGENT_FAILURE);
283: send:
284: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 285: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
286: key_free(key);
287: BN_clear_free(challenge);
288: buffer_free(&msg);
289: }
290:
291: /* ssh2 only */
1.55 itojun 292: static void
1.33 markus 293: process_sign_request2(SocketEntry *e)
294: {
1.45 markus 295: u_char *blob, *data, *signature = NULL;
296: u_int blen, dlen, slen = 0;
1.96 deraadt 297: extern int datafellows;
298: int ok = -1, flags;
1.33 markus 299: Buffer msg;
1.96 deraadt 300: Key *key;
1.33 markus 301:
302: datafellows = 0;
1.43 markus 303:
1.87 markus 304: blob = buffer_get_string(&e->request, &blen);
305: data = buffer_get_string(&e->request, &dlen);
1.37 markus 306:
1.87 markus 307: flags = buffer_get_int(&e->request);
1.37 markus 308: if (flags & SSH_AGENT_OLD_SIGNATURE)
309: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 310:
1.39 markus 311: key = key_from_blob(blob, blen);
1.33 markus 312: if (key != NULL) {
1.78 provos 313: Identity *id = lookup_identity(key, 2);
1.107 markus 314: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 315: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 316: key_free(key);
1.33 markus 317: }
318: buffer_init(&msg);
319: if (ok == 0) {
320: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
321: buffer_put_string(&msg, signature, slen);
322: } else {
323: buffer_put_char(&msg, SSH_AGENT_FAILURE);
324: }
325: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 326: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 327: buffer_len(&msg));
1.21 markus 328: buffer_free(&msg);
1.33 markus 329: xfree(data);
330: xfree(blob);
331: if (signature != NULL)
332: xfree(signature);
1.1 deraadt 333: }
334:
1.33 markus 335: /* shared */
1.55 itojun 336: static void
1.33 markus 337: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 338: {
1.96 deraadt 339: u_int blen, bits;
340: int success = 0;
1.78 provos 341: Key *key = NULL;
1.45 markus 342: u_char *blob;
1.21 markus 343:
1.74 deraadt 344: switch (version) {
1.33 markus 345: case 1:
1.39 markus 346: key = key_new(KEY_RSA1);
1.87 markus 347: bits = buffer_get_int(&e->request);
348: buffer_get_bignum(&e->request, key->rsa->e);
349: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 350:
351: if (bits != key_size(key))
1.109 itojun 352: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 353: key_size(key), bits);
1.33 markus 354: break;
355: case 2:
1.87 markus 356: blob = buffer_get_string(&e->request, &blen);
1.39 markus 357: key = key_from_blob(blob, blen);
1.33 markus 358: xfree(blob);
359: break;
360: }
361: if (key != NULL) {
1.78 provos 362: Identity *id = lookup_identity(key, version);
363: if (id != NULL) {
1.23 markus 364: /*
365: * We have this key. Free the old key. Since we
1.124 djm 366: * don't want to leave empty slots in the middle of
1.40 markus 367: * the array, we actually free the key there and move
368: * all the entries between the empty slot and the end
369: * of the array.
1.23 markus 370: */
1.33 markus 371: Idtab *tab = idtab_lookup(version);
1.38 markus 372: if (tab->nentries < 1)
373: fatal("process_remove_identity: "
374: "internal error: tab->nentries %d",
375: tab->nentries);
1.78 provos 376: TAILQ_REMOVE(&tab->idlist, id, next);
377: free_identity(id);
1.33 markus 378: tab->nentries--;
379: success = 1;
1.21 markus 380: }
1.33 markus 381: key_free(key);
382: }
1.1 deraadt 383: buffer_put_int(&e->output, 1);
1.33 markus 384: buffer_put_char(&e->output,
385: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 386: }
387:
1.55 itojun 388: static void
1.33 markus 389: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 390: {
1.33 markus 391: Idtab *tab = idtab_lookup(version);
1.78 provos 392: Identity *id;
1.21 markus 393:
394: /* Loop over all identities and clear the keys. */
1.78 provos 395: for (id = TAILQ_FIRST(&tab->idlist); id;
396: id = TAILQ_FIRST(&tab->idlist)) {
397: TAILQ_REMOVE(&tab->idlist, id, next);
398: free_identity(id);
1.21 markus 399: }
400:
401: /* Mark that there are no identities. */
1.33 markus 402: tab->nentries = 0;
1.21 markus 403:
404: /* Send success. */
405: buffer_put_int(&e->output, 1);
406: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 407: }
408:
1.55 itojun 409: static void
1.89 markus 410: reaper(void)
411: {
1.96 deraadt 412: u_int now = time(NULL);
1.89 markus 413: Identity *id, *nxt;
414: int version;
1.96 deraadt 415: Idtab *tab;
1.89 markus 416:
417: for (version = 1; version < 3; version++) {
418: tab = idtab_lookup(version);
419: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
420: nxt = TAILQ_NEXT(id, next);
421: if (id->death != 0 && now >= id->death) {
422: TAILQ_REMOVE(&tab->idlist, id, next);
423: free_identity(id);
424: tab->nentries--;
425: }
426: }
427: }
428: }
429:
430: static void
1.33 markus 431: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 432: {
1.96 deraadt 433: Idtab *tab = idtab_lookup(version);
1.107 markus 434: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 435: char *type_name, *comment;
1.33 markus 436: Key *k = NULL;
437:
438: switch (version) {
439: case 1:
1.39 markus 440: k = key_new_private(KEY_RSA1);
1.97 markus 441: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 442: buffer_get_bignum(&e->request, k->rsa->n);
443: buffer_get_bignum(&e->request, k->rsa->e);
444: buffer_get_bignum(&e->request, k->rsa->d);
445: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 446:
447: /* SSH and SSL have p and q swapped */
1.87 markus 448: buffer_get_bignum(&e->request, k->rsa->q); /* p */
449: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 450:
451: /* Generate additional parameters */
1.60 markus 452: rsa_generate_additional_parameters(k->rsa);
1.33 markus 453: break;
454: case 2:
1.87 markus 455: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 456: type = key_type_from_name(type_name);
1.39 markus 457: xfree(type_name);
1.74 deraadt 458: switch (type) {
1.39 markus 459: case KEY_DSA:
460: k = key_new_private(type);
1.87 markus 461: buffer_get_bignum2(&e->request, k->dsa->p);
462: buffer_get_bignum2(&e->request, k->dsa->q);
463: buffer_get_bignum2(&e->request, k->dsa->g);
464: buffer_get_bignum2(&e->request, k->dsa->pub_key);
465: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 466: break;
467: case KEY_RSA:
468: k = key_new_private(type);
1.87 markus 469: buffer_get_bignum2(&e->request, k->rsa->n);
470: buffer_get_bignum2(&e->request, k->rsa->e);
471: buffer_get_bignum2(&e->request, k->rsa->d);
472: buffer_get_bignum2(&e->request, k->rsa->iqmp);
473: buffer_get_bignum2(&e->request, k->rsa->p);
474: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 475:
476: /* Generate additional parameters */
1.60 markus 477: rsa_generate_additional_parameters(k->rsa);
1.39 markus 478: break;
479: default:
1.87 markus 480: buffer_clear(&e->request);
1.108 markus 481: goto send;
482: }
483: break;
484: }
485: /* enable blinding */
486: switch (k->type) {
487: case KEY_RSA:
488: case KEY_RSA1:
489: if (RSA_blinding_on(k->rsa, NULL) != 1) {
490: error("process_add_identity: RSA_blinding_on failed");
491: key_free(k);
1.33 markus 492: goto send;
1.21 markus 493: }
1.33 markus 494: break;
495: }
1.87 markus 496: comment = buffer_get_string(&e->request, NULL);
1.33 markus 497: if (k == NULL) {
498: xfree(comment);
499: goto send;
500: }
501: success = 1;
1.94 markus 502: while (buffer_len(&e->request)) {
503: switch (buffer_get_char(&e->request)) {
504: case SSH_AGENT_CONSTRAIN_LIFETIME:
505: death = time(NULL) + buffer_get_int(&e->request);
506: break;
1.107 markus 507: case SSH_AGENT_CONSTRAIN_CONFIRM:
508: confirm = 1;
509: break;
1.94 markus 510: default:
511: break;
512: }
513: }
1.106 marc 514: if (lifetime && !death)
515: death = time(NULL) + lifetime;
1.78 provos 516: if (lookup_identity(k, version) == NULL) {
517: Identity *id = xmalloc(sizeof(Identity));
518: id->key = k;
519: id->comment = comment;
1.94 markus 520: id->death = death;
1.107 markus 521: id->confirm = confirm;
1.78 provos 522: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 523: /* Increment the number of identities. */
524: tab->nentries++;
525: } else {
526: key_free(k);
527: xfree(comment);
528: }
529: send:
1.1 deraadt 530: buffer_put_int(&e->output, 1);
1.33 markus 531: buffer_put_char(&e->output,
532: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 533: }
534:
1.88 markus 535: /* XXX todo: encrypt sensitive data with passphrase */
536: static void
537: process_lock_agent(SocketEntry *e, int lock)
538: {
1.96 deraadt 539: int success = 0;
1.88 markus 540: char *passwd;
541:
542: passwd = buffer_get_string(&e->request, NULL);
543: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
544: locked = 0;
545: memset(lock_passwd, 0, strlen(lock_passwd));
546: xfree(lock_passwd);
547: lock_passwd = NULL;
548: success = 1;
549: } else if (!locked && lock) {
550: locked = 1;
551: lock_passwd = xstrdup(passwd);
552: success = 1;
553: }
554: memset(passwd, 0, strlen(passwd));
555: xfree(passwd);
1.95 deraadt 556:
1.88 markus 557: buffer_put_int(&e->output, 1);
558: buffer_put_char(&e->output,
559: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
560: }
561:
562: static void
563: no_identities(SocketEntry *e, u_int type)
564: {
565: Buffer msg;
566:
567: buffer_init(&msg);
568: buffer_put_char(&msg,
569: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
570: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
571: buffer_put_int(&msg, 0);
572: buffer_put_int(&e->output, buffer_len(&msg));
573: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
574: buffer_free(&msg);
575: }
1.59 markus 576:
577: #ifdef SMARTCARD
578: static void
579: process_add_smartcard_key (SocketEntry *e)
580: {
1.96 deraadt 581: char *sc_reader_id = NULL, *pin;
1.110 djm 582: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 583: Key **keys, *k;
1.84 markus 584: Identity *id;
1.59 markus 585: Idtab *tab;
1.75 deraadt 586:
1.87 markus 587: sc_reader_id = buffer_get_string(&e->request, NULL);
588: pin = buffer_get_string(&e->request, NULL);
1.110 djm 589:
590: while (buffer_len(&e->request)) {
591: switch (buffer_get_char(&e->request)) {
592: case SSH_AGENT_CONSTRAIN_LIFETIME:
593: death = time(NULL) + buffer_get_int(&e->request);
594: break;
595: case SSH_AGENT_CONSTRAIN_CONFIRM:
596: confirm = 1;
597: break;
598: default:
599: break;
600: }
601: }
602: if (lifetime && !death)
603: death = time(NULL) + lifetime;
604:
1.84 markus 605: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 606: xfree(sc_reader_id);
1.83 rees 607: xfree(pin);
1.59 markus 608:
1.84 markus 609: if (keys == NULL || keys[0] == NULL) {
610: error("sc_get_keys failed");
1.59 markus 611: goto send;
612: }
1.84 markus 613: for (i = 0; keys[i] != NULL; i++) {
614: k = keys[i];
615: version = k->type == KEY_RSA1 ? 1 : 2;
616: tab = idtab_lookup(version);
617: if (lookup_identity(k, version) == NULL) {
618: id = xmalloc(sizeof(Identity));
619: id->key = k;
1.111 markus 620: id->comment = sc_get_key_label(k);
1.110 djm 621: id->death = death;
622: id->confirm = confirm;
1.84 markus 623: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
624: tab->nentries++;
625: success = 1;
626: } else {
627: key_free(k);
628: }
629: keys[i] = NULL;
1.59 markus 630: }
1.84 markus 631: xfree(keys);
1.59 markus 632: send:
633: buffer_put_int(&e->output, 1);
634: buffer_put_char(&e->output,
635: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
636: }
637:
638: static void
639: process_remove_smartcard_key(SocketEntry *e)
640: {
1.96 deraadt 641: char *sc_reader_id = NULL, *pin;
642: int i, version, success = 0;
643: Key **keys, *k = NULL;
1.84 markus 644: Identity *id;
645: Idtab *tab;
1.59 markus 646:
1.87 markus 647: sc_reader_id = buffer_get_string(&e->request, NULL);
648: pin = buffer_get_string(&e->request, NULL);
1.84 markus 649: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 650: xfree(sc_reader_id);
1.83 rees 651: xfree(pin);
1.59 markus 652:
1.84 markus 653: if (keys == NULL || keys[0] == NULL) {
654: error("sc_get_keys failed");
655: goto send;
656: }
657: for (i = 0; keys[i] != NULL; i++) {
658: k = keys[i];
659: version = k->type == KEY_RSA1 ? 1 : 2;
660: if ((id = lookup_identity(k, version)) != NULL) {
661: tab = idtab_lookup(version);
1.90 markus 662: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 663: tab->nentries--;
1.78 provos 664: free_identity(id);
1.59 markus 665: success = 1;
666: }
667: key_free(k);
1.84 markus 668: keys[i] = NULL;
1.59 markus 669: }
1.84 markus 670: xfree(keys);
671: send:
1.59 markus 672: buffer_put_int(&e->output, 1);
673: buffer_put_char(&e->output,
674: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
675: }
1.70 jakob 676: #endif /* SMARTCARD */
1.59 markus 677:
1.33 markus 678: /* dispatch incoming messages */
679:
1.55 itojun 680: static void
1.2 provos 681: process_message(SocketEntry *e)
1.1 deraadt 682: {
1.96 deraadt 683: u_int msg_len, type;
1.45 markus 684: u_char *cp;
1.89 markus 685:
686: /* kill dead keys */
687: reaper();
688:
1.21 markus 689: if (buffer_len(&e->input) < 5)
690: return; /* Incomplete message. */
1.77 stevesk 691: cp = buffer_ptr(&e->input);
1.137 djm 692: msg_len = get_u32(cp);
1.21 markus 693: if (msg_len > 256 * 1024) {
1.101 stevesk 694: close_socket(e);
1.21 markus 695: return;
696: }
697: if (buffer_len(&e->input) < msg_len + 4)
698: return;
1.87 markus 699:
700: /* move the current input to e->request */
1.21 markus 701: buffer_consume(&e->input, 4);
1.87 markus 702: buffer_clear(&e->request);
703: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
704: buffer_consume(&e->input, msg_len);
705: type = buffer_get_char(&e->request);
1.21 markus 706:
1.88 markus 707: /* check wheter agent is locked */
708: if (locked && type != SSH_AGENTC_UNLOCK) {
709: buffer_clear(&e->request);
710: switch (type) {
711: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
712: case SSH2_AGENTC_REQUEST_IDENTITIES:
713: /* send empty lists */
714: no_identities(e, type);
715: break;
716: default:
717: /* send a fail message for all other request types */
718: buffer_put_int(&e->output, 1);
719: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
720: }
721: return;
722: }
723:
1.59 markus 724: debug("type %d", type);
1.21 markus 725: switch (type) {
1.88 markus 726: case SSH_AGENTC_LOCK:
727: case SSH_AGENTC_UNLOCK:
728: process_lock_agent(e, type == SSH_AGENTC_LOCK);
729: break;
1.33 markus 730: /* ssh1 */
731: case SSH_AGENTC_RSA_CHALLENGE:
732: process_authentication_challenge1(e);
733: break;
1.21 markus 734: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 735: process_request_identities(e, 1);
1.21 markus 736: break;
737: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 738: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 739: process_add_identity(e, 1);
1.21 markus 740: break;
741: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 742: process_remove_identity(e, 1);
1.21 markus 743: break;
744: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 745: process_remove_all_identities(e, 1);
746: break;
747: /* ssh2 */
748: case SSH2_AGENTC_SIGN_REQUEST:
749: process_sign_request2(e);
750: break;
751: case SSH2_AGENTC_REQUEST_IDENTITIES:
752: process_request_identities(e, 2);
753: break;
754: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 755: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 756: process_add_identity(e, 2);
757: break;
758: case SSH2_AGENTC_REMOVE_IDENTITY:
759: process_remove_identity(e, 2);
760: break;
761: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
762: process_remove_all_identities(e, 2);
1.21 markus 763: break;
1.59 markus 764: #ifdef SMARTCARD
765: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 766: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 767: process_add_smartcard_key(e);
1.75 deraadt 768: break;
1.59 markus 769: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
770: process_remove_smartcard_key(e);
1.75 deraadt 771: break;
1.70 jakob 772: #endif /* SMARTCARD */
1.21 markus 773: default:
774: /* Unknown message. Respond with failure. */
775: error("Unknown message %d", type);
1.87 markus 776: buffer_clear(&e->request);
1.21 markus 777: buffer_put_int(&e->output, 1);
778: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
779: break;
780: }
1.1 deraadt 781: }
782:
1.55 itojun 783: static void
1.73 stevesk 784: new_socket(sock_type type, int fd)
1.1 deraadt 785: {
1.112 markus 786: u_int i, old_alloc, new_alloc;
1.96 deraadt 787:
1.119 djm 788: set_nonblock(fd);
1.21 markus 789:
790: if (fd > max_fd)
791: max_fd = fd;
792:
793: for (i = 0; i < sockets_alloc; i++)
794: if (sockets[i].type == AUTH_UNUSED) {
795: sockets[i].fd = fd;
796: buffer_init(&sockets[i].input);
797: buffer_init(&sockets[i].output);
1.87 markus 798: buffer_init(&sockets[i].request);
1.112 markus 799: sockets[i].type = type;
1.21 markus 800: return;
801: }
802: old_alloc = sockets_alloc;
1.112 markus 803: new_alloc = sockets_alloc + 10;
1.133 djm 804: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 805: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 806: sockets[i].type = AUTH_UNUSED;
1.112 markus 807: sockets_alloc = new_alloc;
1.21 markus 808: sockets[old_alloc].fd = fd;
809: buffer_init(&sockets[old_alloc].input);
810: buffer_init(&sockets[old_alloc].output);
1.87 markus 811: buffer_init(&sockets[old_alloc].request);
1.112 markus 812: sockets[old_alloc].type = type;
1.1 deraadt 813: }
814:
1.55 itojun 815: static int
1.120 avsm 816: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 817: {
1.46 markus 818: u_int i, sz;
819: int n = 0;
820:
821: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 822: switch (sockets[i].type) {
823: case AUTH_SOCKET:
824: case AUTH_CONNECTION:
1.46 markus 825: n = MAX(n, sockets[i].fd);
1.21 markus 826: break;
827: case AUTH_UNUSED:
828: break;
829: default:
830: fatal("Unknown socket type %d", sockets[i].type);
831: break;
832: }
1.46 markus 833: }
834:
835: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 836: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 837: if (*fdrp)
1.54 stevesk 838: xfree(*fdrp);
1.46 markus 839: if (*fdwp)
1.54 stevesk 840: xfree(*fdwp);
1.46 markus 841: *fdrp = xmalloc(sz);
842: *fdwp = xmalloc(sz);
1.66 markus 843: *nallocp = sz;
1.46 markus 844: }
1.66 markus 845: if (n < *fdl)
846: debug("XXX shrink: %d < %d", n, *fdl);
847: *fdl = n;
1.46 markus 848: memset(*fdrp, 0, sz);
849: memset(*fdwp, 0, sz);
850:
851: for (i = 0; i < sockets_alloc; i++) {
852: switch (sockets[i].type) {
853: case AUTH_SOCKET:
854: case AUTH_CONNECTION:
855: FD_SET(sockets[i].fd, *fdrp);
856: if (buffer_len(&sockets[i].output) > 0)
857: FD_SET(sockets[i].fd, *fdwp);
858: break;
859: default:
860: break;
861: }
862: }
863: return (1);
1.21 markus 864: }
865:
1.55 itojun 866: static void
1.21 markus 867: after_select(fd_set *readset, fd_set *writeset)
868: {
1.96 deraadt 869: struct sockaddr_un sunaddr;
1.26 markus 870: socklen_t slen;
1.21 markus 871: char buf[1024];
1.96 deraadt 872: int len, sock;
873: u_int i;
1.103 markus 874: uid_t euid;
875: gid_t egid;
1.21 markus 876:
877: for (i = 0; i < sockets_alloc; i++)
878: switch (sockets[i].type) {
879: case AUTH_UNUSED:
880: break;
881: case AUTH_SOCKET:
882: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 883: slen = sizeof(sunaddr);
1.46 markus 884: sock = accept(sockets[i].fd,
1.131 deraadt 885: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 886: if (sock < 0) {
1.81 stevesk 887: error("accept from AUTH_SOCKET: %s",
888: strerror(errno));
1.103 markus 889: break;
890: }
891: if (getpeereid(sock, &euid, &egid) < 0) {
892: error("getpeereid %d failed: %s",
893: sock, strerror(errno));
894: close(sock);
895: break;
896: }
1.105 markus 897: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 898: error("uid mismatch: "
1.104 stevesk 899: "peer euid %u != uid %u",
900: (u_int) euid, (u_int) getuid());
1.103 markus 901: close(sock);
1.21 markus 902: break;
903: }
904: new_socket(AUTH_CONNECTION, sock);
905: }
906: break;
907: case AUTH_CONNECTION:
908: if (buffer_len(&sockets[i].output) > 0 &&
909: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 910: do {
911: len = write(sockets[i].fd,
912: buffer_ptr(&sockets[i].output),
913: buffer_len(&sockets[i].output));
914: if (len == -1 && (errno == EAGAIN ||
915: errno == EINTR))
916: continue;
917: break;
918: } while (1);
1.21 markus 919: if (len <= 0) {
1.101 stevesk 920: close_socket(&sockets[i]);
1.21 markus 921: break;
922: }
923: buffer_consume(&sockets[i].output, len);
924: }
925: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 926: do {
927: len = read(sockets[i].fd, buf, sizeof(buf));
928: if (len == -1 && (errno == EAGAIN ||
929: errno == EINTR))
930: continue;
931: break;
932: } while (1);
1.21 markus 933: if (len <= 0) {
1.101 stevesk 934: close_socket(&sockets[i]);
1.21 markus 935: break;
936: }
937: buffer_append(&sockets[i].input, buf, len);
938: process_message(&sockets[i]);
939: }
940: break;
941: default:
942: fatal("Unknown type %d", sockets[i].type);
943: }
1.1 deraadt 944: }
945:
1.55 itojun 946: static void
1.113 markus 947: cleanup_socket(void)
1.15 markus 948: {
1.48 deraadt 949: if (socket_name[0])
950: unlink(socket_name);
951: if (socket_dir[0])
952: rmdir(socket_dir);
1.10 markus 953: }
954:
1.114 markus 955: void
1.15 markus 956: cleanup_exit(int i)
957: {
1.113 markus 958: cleanup_socket();
959: _exit(i);
1.15 markus 960: }
961:
1.135 deraadt 962: /*ARGSUSED*/
1.55 itojun 963: static void
1.48 deraadt 964: cleanup_handler(int sig)
965: {
1.113 markus 966: cleanup_socket();
1.48 deraadt 967: _exit(2);
1.113 markus 968: }
969:
1.135 deraadt 970: /*ARGSUSED*/
1.68 markus 971: static void
972: check_parent_exists(int sig)
973: {
974: int save_errno = errno;
975:
976: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
977: /* printf("Parent has died - Authentication agent exiting.\n"); */
978: cleanup_handler(sig); /* safe */
979: }
980: signal(SIGALRM, check_parent_exists);
981: alarm(10);
982: errno = save_errno;
1.48 deraadt 983: }
984:
1.55 itojun 985: static void
1.50 itojun 986: usage(void)
1.15 markus 987: {
1.72 jakob 988: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 989: __progname);
1.72 jakob 990: fprintf(stderr, "Options:\n");
991: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
992: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
993: fprintf(stderr, " -k Kill the current agent.\n");
994: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 995: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 996: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 997: exit(1);
1.15 markus 998: }
999:
1.2 provos 1000: int
1001: main(int ac, char **av)
1.1 deraadt 1002: {
1.107 markus 1003: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.120 avsm 1004: int sock, fd, ch;
1005: u_int nalloc;
1.96 deraadt 1006: char *shell, *format, *pidstr, *agentsocket = NULL;
1007: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1008: struct sockaddr_un sunaddr;
1.41 markus 1009: struct rlimit rlim;
1.96 deraadt 1010: extern int optind;
1.98 stevesk 1011: extern char *optarg;
1.21 markus 1012: pid_t pid;
1.96 deraadt 1013: char pidstrbuf[1 + 3 * sizeof pid];
1.123 djm 1014:
1015: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1016: sanitise_stdfd();
1.99 markus 1017:
1018: /* drop */
1019: setegid(getgid());
1020: setgid(getgid());
1.53 markus 1021:
1022: SSLeay_add_all_algorithms();
1.21 markus 1023:
1.106 marc 1024: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1025: switch (ch) {
1026: case 'c':
1027: if (s_flag)
1028: usage();
1029: c_flag++;
1030: break;
1031: case 'k':
1032: k_flag++;
1033: break;
1034: case 's':
1035: if (c_flag)
1036: usage();
1037: s_flag++;
1038: break;
1.57 markus 1039: case 'd':
1040: if (d_flag)
1041: usage();
1042: d_flag++;
1043: break;
1.86 markus 1044: case 'a':
1045: agentsocket = optarg;
1.106 marc 1046: break;
1047: case 't':
1048: if ((lifetime = convtime(optarg)) == -1) {
1049: fprintf(stderr, "Invalid lifetime\n");
1050: usage();
1051: }
1.86 markus 1052: break;
1.21 markus 1053: default:
1054: usage();
1055: }
1056: }
1057: ac -= optind;
1058: av += optind;
1059:
1.57 markus 1060: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1061: usage();
1062:
1.85 markus 1063: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1064: shell = getenv("SHELL");
1.136 deraadt 1065: if (shell != NULL &&
1066: strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1.21 markus 1067: c_flag = 1;
1068: }
1069: if (k_flag) {
1.136 deraadt 1070: const char *errstr = NULL;
1071:
1.21 markus 1072: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1073: if (pidstr == NULL) {
1074: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1075: SSH_AGENTPID_ENV_NAME);
1.21 markus 1076: exit(1);
1077: }
1.136 deraadt 1078: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1079: if (errstr) {
1080: fprintf(stderr,
1081: "%s=\"%s\", which is not a good PID: %s\n",
1082: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1083: exit(1);
1084: }
1085: if (kill(pid, SIGTERM) == -1) {
1086: perror("kill");
1087: exit(1);
1088: }
1089: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1090: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1091: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1092: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1093: exit(0);
1094: }
1095: parent_pid = getpid();
1096:
1.86 markus 1097: if (agentsocket == NULL) {
1098: /* Create private directory for agent socket */
1.115 markus 1099: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1100: if (mkdtemp(socket_dir) == NULL) {
1101: perror("mkdtemp: private socket dir");
1102: exit(1);
1103: }
1.91 mpech 1104: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1105: (long)parent_pid);
1.86 markus 1106: } else {
1107: /* Try to use specified agent socket */
1108: socket_dir[0] = '\0';
1109: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1110: }
1111:
1.23 markus 1112: /*
1113: * Create socket early so it will exist before command gets run from
1114: * the parent.
1115: */
1.21 markus 1116: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1117: if (sock < 0) {
1118: perror("socket");
1.121 djm 1119: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1120: cleanup_exit(1);
1121: }
1122: memset(&sunaddr, 0, sizeof(sunaddr));
1123: sunaddr.sun_family = AF_UNIX;
1124: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1125: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1126: perror("bind");
1.121 djm 1127: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1128: cleanup_exit(1);
1129: }
1.117 markus 1130: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1131: perror("listen");
1132: cleanup_exit(1);
1133: }
1.46 markus 1134:
1.23 markus 1135: /*
1136: * Fork, and have the parent execute the command, if any, or present
1137: * the socket data. The child continues as the authentication agent.
1138: */
1.57 markus 1139: if (d_flag) {
1140: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1141: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1142: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1143: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1144: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1145: goto skip;
1146: }
1.21 markus 1147: pid = fork();
1148: if (pid == -1) {
1149: perror("fork");
1.81 stevesk 1150: cleanup_exit(1);
1.21 markus 1151: }
1152: if (pid != 0) { /* Parent - execute the given command. */
1153: close(sock);
1.91 mpech 1154: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1155: if (ac == 0) {
1156: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1157: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1158: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1159: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1160: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1161: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1162: exit(0);
1163: }
1.36 deraadt 1164: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1165: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1166: perror("setenv");
1167: exit(1);
1168: }
1.21 markus 1169: execvp(av[0], av);
1170: perror(av[0]);
1171: exit(1);
1172: }
1.81 stevesk 1173: /* child */
1174: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1175:
1176: if (setsid() == -1) {
1.81 stevesk 1177: error("setsid: %s", strerror(errno));
1.67 stevesk 1178: cleanup_exit(1);
1179: }
1180:
1181: (void)chdir("/");
1.107 markus 1182: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1183: /* XXX might close listen socket */
1184: (void)dup2(fd, STDIN_FILENO);
1185: (void)dup2(fd, STDOUT_FILENO);
1186: (void)dup2(fd, STDERR_FILENO);
1187: if (fd > 2)
1188: close(fd);
1189: }
1.21 markus 1190:
1.41 markus 1191: /* deny core dumps, since memory contains unencrypted private keys */
1192: rlim.rlim_cur = rlim.rlim_max = 0;
1193: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1194: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1195: cleanup_exit(1);
1196: }
1.57 markus 1197:
1198: skip:
1.21 markus 1199: new_socket(AUTH_SOCKET, sock);
1200: if (ac > 0) {
1201: signal(SIGALRM, check_parent_exists);
1202: alarm(10);
1203: }
1.33 markus 1204: idtab_init();
1.61 markus 1205: if (!d_flag)
1.57 markus 1206: signal(SIGINT, SIG_IGN);
1.61 markus 1207: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1208: signal(SIGHUP, cleanup_handler);
1209: signal(SIGTERM, cleanup_handler);
1.66 markus 1210: nalloc = 0;
1211:
1.21 markus 1212: while (1) {
1.66 markus 1213: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1214: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1215: if (errno == EINTR)
1216: continue;
1.81 stevesk 1217: fatal("select: %s", strerror(errno));
1.21 markus 1218: }
1.46 markus 1219: after_select(readsetp, writesetp);
1.15 markus 1220: }
1.21 markus 1221: /* NOTREACHED */
1.1 deraadt 1222: }
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