Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.147
1.147 ! stevesk 1: /* $OpenBSD: ssh-agent.c,v 1.146 2006/07/22 20:48:23 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>
1.147 ! stevesk 44: #include <sys/time.h>
1.126 stevesk 45:
1.146 stevesk 46: #include <openssl/evp.h>
47: #include <openssl/md5.h>
48:
1.143 stevesk 49: #include <errno.h>
1.142 stevesk 50: #include <fcntl.h>
1.126 stevesk 51: #include <paths.h>
1.129 stevesk 52: #include <signal.h>
1.146 stevesk 53: #include <string.h>
1.145 stevesk 54: #include <time.h>
1.144 stevesk 55: #include <unistd.h>
1.1 deraadt 56:
57: #include "ssh.h"
58: #include "rsa.h"
59: #include "buffer.h"
60: #include "bufaux.h"
61: #include "xmalloc.h"
1.32 markus 62: #include "key.h"
63: #include "authfd.h"
1.37 markus 64: #include "compat.h"
1.47 markus 65: #include "log.h"
1.107 markus 66: #include "misc.h"
1.7 deraadt 67:
1.59 markus 68: #ifdef SMARTCARD
69: #include "scard.h"
1.71 jakob 70: #endif
1.59 markus 71:
1.73 stevesk 72: typedef enum {
73: AUTH_UNUSED,
74: AUTH_SOCKET,
75: AUTH_CONNECTION
76: } sock_type;
77:
1.21 markus 78: typedef struct {
79: int fd;
1.73 stevesk 80: sock_type type;
1.21 markus 81: Buffer input;
82: Buffer output;
1.87 markus 83: Buffer request;
1.1 deraadt 84: } SocketEntry;
85:
1.45 markus 86: u_int sockets_alloc = 0;
1.1 deraadt 87: SocketEntry *sockets = NULL;
88:
1.78 provos 89: typedef struct identity {
90: TAILQ_ENTRY(identity) next;
1.33 markus 91: Key *key;
1.21 markus 92: char *comment;
1.89 markus 93: u_int death;
1.107 markus 94: u_int confirm;
1.1 deraadt 95: } Identity;
96:
1.33 markus 97: typedef struct {
98: int nentries;
1.78 provos 99: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 100: } Idtab;
101:
102: /* private key table, one per protocol version */
103: Idtab idtable[3];
1.1 deraadt 104:
105: int max_fd = 0;
106:
1.11 markus 107: /* pid of shell == parent of agent */
1.29 deraadt 108: pid_t parent_pid = -1;
1.10 markus 109:
110: /* pathname and directory for AUTH_SOCKET */
1.132 djm 111: char socket_name[MAXPATHLEN];
112: char socket_dir[MAXPATHLEN];
1.10 markus 113:
1.88 markus 114: /* locking */
115: int locked = 0;
116: char *lock_passwd = NULL;
117:
1.20 markus 118: extern char *__progname;
119:
1.106 marc 120: /* Default lifetime (0 == forever) */
121: static int lifetime = 0;
122:
1.55 itojun 123: static void
1.101 stevesk 124: close_socket(SocketEntry *e)
125: {
126: close(e->fd);
127: e->fd = -1;
128: e->type = AUTH_UNUSED;
129: buffer_free(&e->input);
130: buffer_free(&e->output);
131: buffer_free(&e->request);
132: }
133:
134: static void
1.33 markus 135: idtab_init(void)
1.1 deraadt 136: {
1.33 markus 137: int i;
1.96 deraadt 138:
1.74 deraadt 139: for (i = 0; i <=2; i++) {
1.78 provos 140: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 141: idtable[i].nentries = 0;
142: }
143: }
144:
145: /* return private key table for requested protocol version */
1.55 itojun 146: static Idtab *
1.33 markus 147: idtab_lookup(int version)
148: {
149: if (version < 1 || version > 2)
150: fatal("internal error, bad protocol version %d", version);
151: return &idtable[version];
152: }
153:
1.89 markus 154: static void
155: free_identity(Identity *id)
156: {
157: key_free(id->key);
158: xfree(id->comment);
159: xfree(id);
160: }
161:
1.33 markus 162: /* return matching private key for given public key */
1.78 provos 163: static Identity *
164: lookup_identity(Key *key, int version)
1.33 markus 165: {
1.78 provos 166: Identity *id;
167:
1.33 markus 168: Idtab *tab = idtab_lookup(version);
1.78 provos 169: TAILQ_FOREACH(id, &tab->idlist, next) {
170: if (key_equal(key, id->key))
171: return (id);
1.33 markus 172: }
1.78 provos 173: return (NULL);
174: }
175:
1.107 markus 176: /* Check confirmation of keysign request */
177: static int
178: confirm_key(Identity *id)
179: {
1.122 djm 180: char *p;
1.107 markus 181: int ret = -1;
182:
183: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 184: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
185: id->comment, p))
186: ret = 0;
1.107 markus 187: xfree(p);
1.122 djm 188:
1.107 markus 189: return (ret);
190: }
191:
1.33 markus 192: /* send list of supported public keys to 'client' */
1.55 itojun 193: static void
1.33 markus 194: process_request_identities(SocketEntry *e, int version)
195: {
196: Idtab *tab = idtab_lookup(version);
1.96 deraadt 197: Identity *id;
1.21 markus 198: Buffer msg;
1.1 deraadt 199:
1.21 markus 200: buffer_init(&msg);
1.33 markus 201: buffer_put_char(&msg, (version == 1) ?
202: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
203: buffer_put_int(&msg, tab->nentries);
1.78 provos 204: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 205: if (id->key->type == KEY_RSA1) {
1.33 markus 206: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
207: buffer_put_bignum(&msg, id->key->rsa->e);
208: buffer_put_bignum(&msg, id->key->rsa->n);
209: } else {
1.45 markus 210: u_char *blob;
211: u_int blen;
1.39 markus 212: key_to_blob(id->key, &blob, &blen);
1.33 markus 213: buffer_put_string(&msg, blob, blen);
214: xfree(blob);
215: }
216: buffer_put_cstring(&msg, id->comment);
1.21 markus 217: }
218: buffer_put_int(&e->output, buffer_len(&msg));
219: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
220: buffer_free(&msg);
1.1 deraadt 221: }
222:
1.33 markus 223: /* ssh1 only */
1.55 itojun 224: static void
1.33 markus 225: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 226: {
1.96 deraadt 227: u_char buf[32], mdbuf[16], session_id[16];
228: u_int response_type;
229: BIGNUM *challenge;
1.78 provos 230: Identity *id;
1.33 markus 231: int i, len;
1.21 markus 232: Buffer msg;
233: MD5_CTX md;
1.96 deraadt 234: Key *key;
1.21 markus 235:
236: buffer_init(&msg);
1.39 markus 237: key = key_new(KEY_RSA1);
1.76 markus 238: if ((challenge = BN_new()) == NULL)
239: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 240:
1.97 markus 241: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 242: buffer_get_bignum(&e->request, key->rsa->e);
243: buffer_get_bignum(&e->request, key->rsa->n);
244: buffer_get_bignum(&e->request, challenge);
1.21 markus 245:
1.33 markus 246: /* Only protocol 1.1 is supported */
1.87 markus 247: if (buffer_len(&e->request) == 0)
1.33 markus 248: goto failure;
1.87 markus 249: buffer_get(&e->request, session_id, 16);
250: response_type = buffer_get_int(&e->request);
1.33 markus 251: if (response_type != 1)
252: goto failure;
253:
1.78 provos 254: id = lookup_identity(key, 1);
1.107 markus 255: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 256: Key *private = id->key;
1.33 markus 257: /* Decrypt the challenge using the private key. */
1.49 markus 258: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
259: goto failure;
1.33 markus 260:
261: /* The response is MD5 of decrypted challenge plus session id. */
262: len = BN_num_bytes(challenge);
263: if (len <= 0 || len > 32) {
1.109 itojun 264: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 265: goto failure;
266: }
267: memset(buf, 0, 32);
268: BN_bn2bin(challenge, buf + 32 - len);
269: MD5_Init(&md);
270: MD5_Update(&md, buf, 32);
271: MD5_Update(&md, session_id, 16);
272: MD5_Final(mdbuf, &md);
273:
274: /* Send the response. */
275: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
276: for (i = 0; i < 16; i++)
277: buffer_put_char(&msg, mdbuf[i]);
278: goto send;
279: }
1.21 markus 280:
1.33 markus 281: failure:
282: /* Unknown identity or protocol error. Send failure. */
1.21 markus 283: buffer_put_char(&msg, SSH_AGENT_FAILURE);
284: send:
285: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 286: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
287: key_free(key);
288: BN_clear_free(challenge);
289: buffer_free(&msg);
290: }
291:
292: /* ssh2 only */
1.55 itojun 293: static void
1.33 markus 294: process_sign_request2(SocketEntry *e)
295: {
1.45 markus 296: u_char *blob, *data, *signature = NULL;
297: u_int blen, dlen, slen = 0;
1.96 deraadt 298: extern int datafellows;
299: int ok = -1, flags;
1.33 markus 300: Buffer msg;
1.96 deraadt 301: Key *key;
1.33 markus 302:
303: datafellows = 0;
1.43 markus 304:
1.87 markus 305: blob = buffer_get_string(&e->request, &blen);
306: data = buffer_get_string(&e->request, &dlen);
1.37 markus 307:
1.87 markus 308: flags = buffer_get_int(&e->request);
1.37 markus 309: if (flags & SSH_AGENT_OLD_SIGNATURE)
310: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 311:
1.39 markus 312: key = key_from_blob(blob, blen);
1.33 markus 313: if (key != NULL) {
1.78 provos 314: Identity *id = lookup_identity(key, 2);
1.107 markus 315: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 316: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 317: key_free(key);
1.33 markus 318: }
319: buffer_init(&msg);
320: if (ok == 0) {
321: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
322: buffer_put_string(&msg, signature, slen);
323: } else {
324: buffer_put_char(&msg, SSH_AGENT_FAILURE);
325: }
326: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 327: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 328: buffer_len(&msg));
1.21 markus 329: buffer_free(&msg);
1.33 markus 330: xfree(data);
331: xfree(blob);
332: if (signature != NULL)
333: xfree(signature);
1.1 deraadt 334: }
335:
1.33 markus 336: /* shared */
1.55 itojun 337: static void
1.33 markus 338: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 339: {
1.96 deraadt 340: u_int blen, bits;
341: int success = 0;
1.78 provos 342: Key *key = NULL;
1.45 markus 343: u_char *blob;
1.21 markus 344:
1.74 deraadt 345: switch (version) {
1.33 markus 346: case 1:
1.39 markus 347: key = key_new(KEY_RSA1);
1.87 markus 348: bits = buffer_get_int(&e->request);
349: buffer_get_bignum(&e->request, key->rsa->e);
350: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 351:
352: if (bits != key_size(key))
1.109 itojun 353: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 354: key_size(key), bits);
1.33 markus 355: break;
356: case 2:
1.87 markus 357: blob = buffer_get_string(&e->request, &blen);
1.39 markus 358: key = key_from_blob(blob, blen);
1.33 markus 359: xfree(blob);
360: break;
361: }
362: if (key != NULL) {
1.78 provos 363: Identity *id = lookup_identity(key, version);
364: if (id != NULL) {
1.23 markus 365: /*
366: * We have this key. Free the old key. Since we
1.124 djm 367: * don't want to leave empty slots in the middle of
1.40 markus 368: * the array, we actually free the key there and move
369: * all the entries between the empty slot and the end
370: * of the array.
1.23 markus 371: */
1.33 markus 372: Idtab *tab = idtab_lookup(version);
1.38 markus 373: if (tab->nentries < 1)
374: fatal("process_remove_identity: "
375: "internal error: tab->nentries %d",
376: tab->nentries);
1.78 provos 377: TAILQ_REMOVE(&tab->idlist, id, next);
378: free_identity(id);
1.33 markus 379: tab->nentries--;
380: success = 1;
1.21 markus 381: }
1.33 markus 382: key_free(key);
383: }
1.1 deraadt 384: buffer_put_int(&e->output, 1);
1.33 markus 385: buffer_put_char(&e->output,
386: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 387: }
388:
1.55 itojun 389: static void
1.33 markus 390: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 391: {
1.33 markus 392: Idtab *tab = idtab_lookup(version);
1.78 provos 393: Identity *id;
1.21 markus 394:
395: /* Loop over all identities and clear the keys. */
1.78 provos 396: for (id = TAILQ_FIRST(&tab->idlist); id;
397: id = TAILQ_FIRST(&tab->idlist)) {
398: TAILQ_REMOVE(&tab->idlist, id, next);
399: free_identity(id);
1.21 markus 400: }
401:
402: /* Mark that there are no identities. */
1.33 markus 403: tab->nentries = 0;
1.21 markus 404:
405: /* Send success. */
406: buffer_put_int(&e->output, 1);
407: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 408: }
409:
1.55 itojun 410: static void
1.89 markus 411: reaper(void)
412: {
1.96 deraadt 413: u_int now = time(NULL);
1.89 markus 414: Identity *id, *nxt;
415: int version;
1.96 deraadt 416: Idtab *tab;
1.89 markus 417:
418: for (version = 1; version < 3; version++) {
419: tab = idtab_lookup(version);
420: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
421: nxt = TAILQ_NEXT(id, next);
422: if (id->death != 0 && now >= id->death) {
423: TAILQ_REMOVE(&tab->idlist, id, next);
424: free_identity(id);
425: tab->nentries--;
426: }
427: }
428: }
429: }
430:
431: static void
1.33 markus 432: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 433: {
1.96 deraadt 434: Idtab *tab = idtab_lookup(version);
1.107 markus 435: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 436: char *type_name, *comment;
1.33 markus 437: Key *k = NULL;
438:
439: switch (version) {
440: case 1:
1.39 markus 441: k = key_new_private(KEY_RSA1);
1.97 markus 442: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 443: buffer_get_bignum(&e->request, k->rsa->n);
444: buffer_get_bignum(&e->request, k->rsa->e);
445: buffer_get_bignum(&e->request, k->rsa->d);
446: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 447:
448: /* SSH and SSL have p and q swapped */
1.87 markus 449: buffer_get_bignum(&e->request, k->rsa->q); /* p */
450: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 451:
452: /* Generate additional parameters */
1.60 markus 453: rsa_generate_additional_parameters(k->rsa);
1.33 markus 454: break;
455: case 2:
1.87 markus 456: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 457: type = key_type_from_name(type_name);
1.39 markus 458: xfree(type_name);
1.74 deraadt 459: switch (type) {
1.39 markus 460: case KEY_DSA:
461: k = key_new_private(type);
1.87 markus 462: buffer_get_bignum2(&e->request, k->dsa->p);
463: buffer_get_bignum2(&e->request, k->dsa->q);
464: buffer_get_bignum2(&e->request, k->dsa->g);
465: buffer_get_bignum2(&e->request, k->dsa->pub_key);
466: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 467: break;
468: case KEY_RSA:
469: k = key_new_private(type);
1.87 markus 470: buffer_get_bignum2(&e->request, k->rsa->n);
471: buffer_get_bignum2(&e->request, k->rsa->e);
472: buffer_get_bignum2(&e->request, k->rsa->d);
473: buffer_get_bignum2(&e->request, k->rsa->iqmp);
474: buffer_get_bignum2(&e->request, k->rsa->p);
475: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 476:
477: /* Generate additional parameters */
1.60 markus 478: rsa_generate_additional_parameters(k->rsa);
1.39 markus 479: break;
480: default:
1.87 markus 481: buffer_clear(&e->request);
1.108 markus 482: goto send;
483: }
484: break;
485: }
486: /* enable blinding */
487: switch (k->type) {
488: case KEY_RSA:
489: case KEY_RSA1:
490: if (RSA_blinding_on(k->rsa, NULL) != 1) {
491: error("process_add_identity: RSA_blinding_on failed");
492: key_free(k);
1.33 markus 493: goto send;
1.21 markus 494: }
1.33 markus 495: break;
496: }
1.87 markus 497: comment = buffer_get_string(&e->request, NULL);
1.33 markus 498: if (k == NULL) {
499: xfree(comment);
500: goto send;
501: }
502: success = 1;
1.94 markus 503: while (buffer_len(&e->request)) {
504: switch (buffer_get_char(&e->request)) {
505: case SSH_AGENT_CONSTRAIN_LIFETIME:
506: death = time(NULL) + buffer_get_int(&e->request);
507: break;
1.107 markus 508: case SSH_AGENT_CONSTRAIN_CONFIRM:
509: confirm = 1;
510: break;
1.94 markus 511: default:
512: break;
513: }
514: }
1.106 marc 515: if (lifetime && !death)
516: death = time(NULL) + lifetime;
1.78 provos 517: if (lookup_identity(k, version) == NULL) {
518: Identity *id = xmalloc(sizeof(Identity));
519: id->key = k;
520: id->comment = comment;
1.94 markus 521: id->death = death;
1.107 markus 522: id->confirm = confirm;
1.78 provos 523: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 524: /* Increment the number of identities. */
525: tab->nentries++;
526: } else {
527: key_free(k);
528: xfree(comment);
529: }
530: send:
1.1 deraadt 531: buffer_put_int(&e->output, 1);
1.33 markus 532: buffer_put_char(&e->output,
533: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 534: }
535:
1.88 markus 536: /* XXX todo: encrypt sensitive data with passphrase */
537: static void
538: process_lock_agent(SocketEntry *e, int lock)
539: {
1.96 deraadt 540: int success = 0;
1.88 markus 541: char *passwd;
542:
543: passwd = buffer_get_string(&e->request, NULL);
544: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
545: locked = 0;
546: memset(lock_passwd, 0, strlen(lock_passwd));
547: xfree(lock_passwd);
548: lock_passwd = NULL;
549: success = 1;
550: } else if (!locked && lock) {
551: locked = 1;
552: lock_passwd = xstrdup(passwd);
553: success = 1;
554: }
555: memset(passwd, 0, strlen(passwd));
556: xfree(passwd);
1.95 deraadt 557:
1.88 markus 558: buffer_put_int(&e->output, 1);
559: buffer_put_char(&e->output,
560: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
561: }
562:
563: static void
564: no_identities(SocketEntry *e, u_int type)
565: {
566: Buffer msg;
567:
568: buffer_init(&msg);
569: buffer_put_char(&msg,
570: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
571: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
572: buffer_put_int(&msg, 0);
573: buffer_put_int(&e->output, buffer_len(&msg));
574: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
575: buffer_free(&msg);
576: }
1.59 markus 577:
578: #ifdef SMARTCARD
579: static void
580: process_add_smartcard_key (SocketEntry *e)
581: {
1.96 deraadt 582: char *sc_reader_id = NULL, *pin;
1.110 djm 583: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 584: Key **keys, *k;
1.84 markus 585: Identity *id;
1.59 markus 586: Idtab *tab;
1.75 deraadt 587:
1.87 markus 588: sc_reader_id = buffer_get_string(&e->request, NULL);
589: pin = buffer_get_string(&e->request, NULL);
1.110 djm 590:
591: while (buffer_len(&e->request)) {
592: switch (buffer_get_char(&e->request)) {
593: case SSH_AGENT_CONSTRAIN_LIFETIME:
594: death = time(NULL) + buffer_get_int(&e->request);
595: break;
596: case SSH_AGENT_CONSTRAIN_CONFIRM:
597: confirm = 1;
598: break;
599: default:
600: break;
601: }
602: }
603: if (lifetime && !death)
604: death = time(NULL) + lifetime;
605:
1.84 markus 606: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 607: xfree(sc_reader_id);
1.83 rees 608: xfree(pin);
1.59 markus 609:
1.84 markus 610: if (keys == NULL || keys[0] == NULL) {
611: error("sc_get_keys failed");
1.59 markus 612: goto send;
613: }
1.84 markus 614: for (i = 0; keys[i] != NULL; i++) {
615: k = keys[i];
616: version = k->type == KEY_RSA1 ? 1 : 2;
617: tab = idtab_lookup(version);
618: if (lookup_identity(k, version) == NULL) {
619: id = xmalloc(sizeof(Identity));
620: id->key = k;
1.111 markus 621: id->comment = sc_get_key_label(k);
1.110 djm 622: id->death = death;
623: id->confirm = confirm;
1.84 markus 624: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
625: tab->nentries++;
626: success = 1;
627: } else {
628: key_free(k);
629: }
630: keys[i] = NULL;
1.59 markus 631: }
1.84 markus 632: xfree(keys);
1.59 markus 633: send:
634: buffer_put_int(&e->output, 1);
635: buffer_put_char(&e->output,
636: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
637: }
638:
639: static void
640: process_remove_smartcard_key(SocketEntry *e)
641: {
1.96 deraadt 642: char *sc_reader_id = NULL, *pin;
643: int i, version, success = 0;
644: Key **keys, *k = NULL;
1.84 markus 645: Identity *id;
646: Idtab *tab;
1.59 markus 647:
1.87 markus 648: sc_reader_id = buffer_get_string(&e->request, NULL);
649: pin = buffer_get_string(&e->request, NULL);
1.84 markus 650: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 651: xfree(sc_reader_id);
1.83 rees 652: xfree(pin);
1.59 markus 653:
1.84 markus 654: if (keys == NULL || keys[0] == NULL) {
655: error("sc_get_keys failed");
656: goto send;
657: }
658: for (i = 0; keys[i] != NULL; i++) {
659: k = keys[i];
660: version = k->type == KEY_RSA1 ? 1 : 2;
661: if ((id = lookup_identity(k, version)) != NULL) {
662: tab = idtab_lookup(version);
1.90 markus 663: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 664: tab->nentries--;
1.78 provos 665: free_identity(id);
1.59 markus 666: success = 1;
667: }
668: key_free(k);
1.84 markus 669: keys[i] = NULL;
1.59 markus 670: }
1.84 markus 671: xfree(keys);
672: send:
1.59 markus 673: buffer_put_int(&e->output, 1);
674: buffer_put_char(&e->output,
675: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
676: }
1.70 jakob 677: #endif /* SMARTCARD */
1.59 markus 678:
1.33 markus 679: /* dispatch incoming messages */
680:
1.55 itojun 681: static void
1.2 provos 682: process_message(SocketEntry *e)
1.1 deraadt 683: {
1.96 deraadt 684: u_int msg_len, type;
1.45 markus 685: u_char *cp;
1.89 markus 686:
687: /* kill dead keys */
688: reaper();
689:
1.21 markus 690: if (buffer_len(&e->input) < 5)
691: return; /* Incomplete message. */
1.77 stevesk 692: cp = buffer_ptr(&e->input);
1.137 djm 693: msg_len = get_u32(cp);
1.21 markus 694: if (msg_len > 256 * 1024) {
1.101 stevesk 695: close_socket(e);
1.21 markus 696: return;
697: }
698: if (buffer_len(&e->input) < msg_len + 4)
699: return;
1.87 markus 700:
701: /* move the current input to e->request */
1.21 markus 702: buffer_consume(&e->input, 4);
1.87 markus 703: buffer_clear(&e->request);
704: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
705: buffer_consume(&e->input, msg_len);
706: type = buffer_get_char(&e->request);
1.21 markus 707:
1.88 markus 708: /* check wheter agent is locked */
709: if (locked && type != SSH_AGENTC_UNLOCK) {
710: buffer_clear(&e->request);
711: switch (type) {
712: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
713: case SSH2_AGENTC_REQUEST_IDENTITIES:
714: /* send empty lists */
715: no_identities(e, type);
716: break;
717: default:
718: /* send a fail message for all other request types */
719: buffer_put_int(&e->output, 1);
720: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
721: }
722: return;
723: }
724:
1.59 markus 725: debug("type %d", type);
1.21 markus 726: switch (type) {
1.88 markus 727: case SSH_AGENTC_LOCK:
728: case SSH_AGENTC_UNLOCK:
729: process_lock_agent(e, type == SSH_AGENTC_LOCK);
730: break;
1.33 markus 731: /* ssh1 */
732: case SSH_AGENTC_RSA_CHALLENGE:
733: process_authentication_challenge1(e);
734: break;
1.21 markus 735: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 736: process_request_identities(e, 1);
1.21 markus 737: break;
738: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 739: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 740: process_add_identity(e, 1);
1.21 markus 741: break;
742: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 743: process_remove_identity(e, 1);
1.21 markus 744: break;
745: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 746: process_remove_all_identities(e, 1);
747: break;
748: /* ssh2 */
749: case SSH2_AGENTC_SIGN_REQUEST:
750: process_sign_request2(e);
751: break;
752: case SSH2_AGENTC_REQUEST_IDENTITIES:
753: process_request_identities(e, 2);
754: break;
755: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 756: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 757: process_add_identity(e, 2);
758: break;
759: case SSH2_AGENTC_REMOVE_IDENTITY:
760: process_remove_identity(e, 2);
761: break;
762: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
763: process_remove_all_identities(e, 2);
1.21 markus 764: break;
1.59 markus 765: #ifdef SMARTCARD
766: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 767: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 768: process_add_smartcard_key(e);
1.75 deraadt 769: break;
1.59 markus 770: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
771: process_remove_smartcard_key(e);
1.75 deraadt 772: break;
1.70 jakob 773: #endif /* SMARTCARD */
1.21 markus 774: default:
775: /* Unknown message. Respond with failure. */
776: error("Unknown message %d", type);
1.87 markus 777: buffer_clear(&e->request);
1.21 markus 778: buffer_put_int(&e->output, 1);
779: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
780: break;
781: }
1.1 deraadt 782: }
783:
1.55 itojun 784: static void
1.73 stevesk 785: new_socket(sock_type type, int fd)
1.1 deraadt 786: {
1.112 markus 787: u_int i, old_alloc, new_alloc;
1.96 deraadt 788:
1.119 djm 789: set_nonblock(fd);
1.21 markus 790:
791: if (fd > max_fd)
792: max_fd = fd;
793:
794: for (i = 0; i < sockets_alloc; i++)
795: if (sockets[i].type == AUTH_UNUSED) {
796: sockets[i].fd = fd;
797: buffer_init(&sockets[i].input);
798: buffer_init(&sockets[i].output);
1.87 markus 799: buffer_init(&sockets[i].request);
1.112 markus 800: sockets[i].type = type;
1.21 markus 801: return;
802: }
803: old_alloc = sockets_alloc;
1.112 markus 804: new_alloc = sockets_alloc + 10;
1.133 djm 805: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 806: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 807: sockets[i].type = AUTH_UNUSED;
1.112 markus 808: sockets_alloc = new_alloc;
1.21 markus 809: sockets[old_alloc].fd = fd;
810: buffer_init(&sockets[old_alloc].input);
811: buffer_init(&sockets[old_alloc].output);
1.87 markus 812: buffer_init(&sockets[old_alloc].request);
1.112 markus 813: sockets[old_alloc].type = type;
1.1 deraadt 814: }
815:
1.55 itojun 816: static int
1.120 avsm 817: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 818: {
1.46 markus 819: u_int i, sz;
820: int n = 0;
821:
822: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 823: switch (sockets[i].type) {
824: case AUTH_SOCKET:
825: case AUTH_CONNECTION:
1.46 markus 826: n = MAX(n, sockets[i].fd);
1.21 markus 827: break;
828: case AUTH_UNUSED:
829: break;
830: default:
831: fatal("Unknown socket type %d", sockets[i].type);
832: break;
833: }
1.46 markus 834: }
835:
836: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 837: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 838: if (*fdrp)
1.54 stevesk 839: xfree(*fdrp);
1.46 markus 840: if (*fdwp)
1.54 stevesk 841: xfree(*fdwp);
1.46 markus 842: *fdrp = xmalloc(sz);
843: *fdwp = xmalloc(sz);
1.66 markus 844: *nallocp = sz;
1.46 markus 845: }
1.66 markus 846: if (n < *fdl)
847: debug("XXX shrink: %d < %d", n, *fdl);
848: *fdl = n;
1.46 markus 849: memset(*fdrp, 0, sz);
850: memset(*fdwp, 0, sz);
851:
852: for (i = 0; i < sockets_alloc; i++) {
853: switch (sockets[i].type) {
854: case AUTH_SOCKET:
855: case AUTH_CONNECTION:
856: FD_SET(sockets[i].fd, *fdrp);
857: if (buffer_len(&sockets[i].output) > 0)
858: FD_SET(sockets[i].fd, *fdwp);
859: break;
860: default:
861: break;
862: }
863: }
864: return (1);
1.21 markus 865: }
866:
1.55 itojun 867: static void
1.21 markus 868: after_select(fd_set *readset, fd_set *writeset)
869: {
1.96 deraadt 870: struct sockaddr_un sunaddr;
1.26 markus 871: socklen_t slen;
1.21 markus 872: char buf[1024];
1.96 deraadt 873: int len, sock;
874: u_int i;
1.103 markus 875: uid_t euid;
876: gid_t egid;
1.21 markus 877:
878: for (i = 0; i < sockets_alloc; i++)
879: switch (sockets[i].type) {
880: case AUTH_UNUSED:
881: break;
882: case AUTH_SOCKET:
883: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 884: slen = sizeof(sunaddr);
1.46 markus 885: sock = accept(sockets[i].fd,
1.131 deraadt 886: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 887: if (sock < 0) {
1.81 stevesk 888: error("accept from AUTH_SOCKET: %s",
889: strerror(errno));
1.103 markus 890: break;
891: }
892: if (getpeereid(sock, &euid, &egid) < 0) {
893: error("getpeereid %d failed: %s",
894: sock, strerror(errno));
895: close(sock);
896: break;
897: }
1.105 markus 898: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 899: error("uid mismatch: "
1.104 stevesk 900: "peer euid %u != uid %u",
901: (u_int) euid, (u_int) getuid());
1.103 markus 902: close(sock);
1.21 markus 903: break;
904: }
905: new_socket(AUTH_CONNECTION, sock);
906: }
907: break;
908: case AUTH_CONNECTION:
909: if (buffer_len(&sockets[i].output) > 0 &&
910: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 911: do {
912: len = write(sockets[i].fd,
913: buffer_ptr(&sockets[i].output),
914: buffer_len(&sockets[i].output));
915: if (len == -1 && (errno == EAGAIN ||
916: errno == EINTR))
917: continue;
918: break;
919: } while (1);
1.21 markus 920: if (len <= 0) {
1.101 stevesk 921: close_socket(&sockets[i]);
1.21 markus 922: break;
923: }
924: buffer_consume(&sockets[i].output, len);
925: }
926: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 927: do {
928: len = read(sockets[i].fd, buf, sizeof(buf));
929: if (len == -1 && (errno == EAGAIN ||
930: errno == EINTR))
931: continue;
932: break;
933: } while (1);
1.21 markus 934: if (len <= 0) {
1.101 stevesk 935: close_socket(&sockets[i]);
1.21 markus 936: break;
937: }
938: buffer_append(&sockets[i].input, buf, len);
939: process_message(&sockets[i]);
940: }
941: break;
942: default:
943: fatal("Unknown type %d", sockets[i].type);
944: }
1.1 deraadt 945: }
946:
1.55 itojun 947: static void
1.113 markus 948: cleanup_socket(void)
1.15 markus 949: {
1.48 deraadt 950: if (socket_name[0])
951: unlink(socket_name);
952: if (socket_dir[0])
953: rmdir(socket_dir);
1.10 markus 954: }
955:
1.114 markus 956: void
1.15 markus 957: cleanup_exit(int i)
958: {
1.113 markus 959: cleanup_socket();
960: _exit(i);
1.15 markus 961: }
962:
1.135 deraadt 963: /*ARGSUSED*/
1.55 itojun 964: static void
1.48 deraadt 965: cleanup_handler(int sig)
966: {
1.113 markus 967: cleanup_socket();
1.48 deraadt 968: _exit(2);
1.113 markus 969: }
970:
1.135 deraadt 971: /*ARGSUSED*/
1.68 markus 972: static void
973: check_parent_exists(int sig)
974: {
975: int save_errno = errno;
976:
977: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
978: /* printf("Parent has died - Authentication agent exiting.\n"); */
979: cleanup_handler(sig); /* safe */
980: }
981: signal(SIGALRM, check_parent_exists);
982: alarm(10);
983: errno = save_errno;
1.48 deraadt 984: }
985:
1.55 itojun 986: static void
1.50 itojun 987: usage(void)
1.15 markus 988: {
1.72 jakob 989: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 990: __progname);
1.72 jakob 991: fprintf(stderr, "Options:\n");
992: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
993: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
994: fprintf(stderr, " -k Kill the current agent.\n");
995: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 996: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 997: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 998: exit(1);
1.15 markus 999: }
1000:
1.2 provos 1001: int
1002: main(int ac, char **av)
1.1 deraadt 1003: {
1.107 markus 1004: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.120 avsm 1005: int sock, fd, ch;
1006: u_int nalloc;
1.96 deraadt 1007: char *shell, *format, *pidstr, *agentsocket = NULL;
1008: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1009: struct sockaddr_un sunaddr;
1.41 markus 1010: struct rlimit rlim;
1.96 deraadt 1011: extern int optind;
1.98 stevesk 1012: extern char *optarg;
1.21 markus 1013: pid_t pid;
1.96 deraadt 1014: char pidstrbuf[1 + 3 * sizeof pid];
1.123 djm 1015:
1016: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1017: sanitise_stdfd();
1.99 markus 1018:
1019: /* drop */
1020: setegid(getgid());
1021: setgid(getgid());
1.53 markus 1022:
1023: SSLeay_add_all_algorithms();
1.21 markus 1024:
1.106 marc 1025: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1026: switch (ch) {
1027: case 'c':
1028: if (s_flag)
1029: usage();
1030: c_flag++;
1031: break;
1032: case 'k':
1033: k_flag++;
1034: break;
1035: case 's':
1036: if (c_flag)
1037: usage();
1038: s_flag++;
1039: break;
1.57 markus 1040: case 'd':
1041: if (d_flag)
1042: usage();
1043: d_flag++;
1044: break;
1.86 markus 1045: case 'a':
1046: agentsocket = optarg;
1.106 marc 1047: break;
1048: case 't':
1049: if ((lifetime = convtime(optarg)) == -1) {
1050: fprintf(stderr, "Invalid lifetime\n");
1051: usage();
1052: }
1.86 markus 1053: break;
1.21 markus 1054: default:
1055: usage();
1056: }
1057: }
1058: ac -= optind;
1059: av += optind;
1060:
1.57 markus 1061: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1062: usage();
1063:
1.85 markus 1064: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1065: shell = getenv("SHELL");
1.136 deraadt 1066: if (shell != NULL &&
1067: strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1.21 markus 1068: c_flag = 1;
1069: }
1070: if (k_flag) {
1.136 deraadt 1071: const char *errstr = NULL;
1072:
1.21 markus 1073: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1074: if (pidstr == NULL) {
1075: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1076: SSH_AGENTPID_ENV_NAME);
1.21 markus 1077: exit(1);
1078: }
1.136 deraadt 1079: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1080: if (errstr) {
1081: fprintf(stderr,
1082: "%s=\"%s\", which is not a good PID: %s\n",
1083: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1084: exit(1);
1085: }
1086: if (kill(pid, SIGTERM) == -1) {
1087: perror("kill");
1088: exit(1);
1089: }
1090: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1091: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1092: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1093: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1094: exit(0);
1095: }
1096: parent_pid = getpid();
1097:
1.86 markus 1098: if (agentsocket == NULL) {
1099: /* Create private directory for agent socket */
1.115 markus 1100: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1101: if (mkdtemp(socket_dir) == NULL) {
1102: perror("mkdtemp: private socket dir");
1103: exit(1);
1104: }
1.91 mpech 1105: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1106: (long)parent_pid);
1.86 markus 1107: } else {
1108: /* Try to use specified agent socket */
1109: socket_dir[0] = '\0';
1110: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1111: }
1112:
1.23 markus 1113: /*
1114: * Create socket early so it will exist before command gets run from
1115: * the parent.
1116: */
1.21 markus 1117: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1118: if (sock < 0) {
1119: perror("socket");
1.121 djm 1120: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1121: cleanup_exit(1);
1122: }
1123: memset(&sunaddr, 0, sizeof(sunaddr));
1124: sunaddr.sun_family = AF_UNIX;
1125: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1126: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1127: perror("bind");
1.121 djm 1128: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1129: cleanup_exit(1);
1130: }
1.117 markus 1131: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1132: perror("listen");
1133: cleanup_exit(1);
1134: }
1.46 markus 1135:
1.23 markus 1136: /*
1137: * Fork, and have the parent execute the command, if any, or present
1138: * the socket data. The child continues as the authentication agent.
1139: */
1.57 markus 1140: if (d_flag) {
1141: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1142: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1143: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1144: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1145: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1146: goto skip;
1147: }
1.21 markus 1148: pid = fork();
1149: if (pid == -1) {
1150: perror("fork");
1.81 stevesk 1151: cleanup_exit(1);
1.21 markus 1152: }
1153: if (pid != 0) { /* Parent - execute the given command. */
1154: close(sock);
1.91 mpech 1155: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1156: if (ac == 0) {
1157: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1158: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1159: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1160: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1161: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1162: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1163: exit(0);
1164: }
1.36 deraadt 1165: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1166: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1167: perror("setenv");
1168: exit(1);
1169: }
1.21 markus 1170: execvp(av[0], av);
1171: perror(av[0]);
1172: exit(1);
1173: }
1.81 stevesk 1174: /* child */
1175: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1176:
1177: if (setsid() == -1) {
1.81 stevesk 1178: error("setsid: %s", strerror(errno));
1.67 stevesk 1179: cleanup_exit(1);
1180: }
1181:
1182: (void)chdir("/");
1.107 markus 1183: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1184: /* XXX might close listen socket */
1185: (void)dup2(fd, STDIN_FILENO);
1186: (void)dup2(fd, STDOUT_FILENO);
1187: (void)dup2(fd, STDERR_FILENO);
1188: if (fd > 2)
1189: close(fd);
1190: }
1.21 markus 1191:
1.41 markus 1192: /* deny core dumps, since memory contains unencrypted private keys */
1193: rlim.rlim_cur = rlim.rlim_max = 0;
1194: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1195: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1196: cleanup_exit(1);
1197: }
1.57 markus 1198:
1199: skip:
1.21 markus 1200: new_socket(AUTH_SOCKET, sock);
1201: if (ac > 0) {
1202: signal(SIGALRM, check_parent_exists);
1203: alarm(10);
1204: }
1.33 markus 1205: idtab_init();
1.61 markus 1206: if (!d_flag)
1.57 markus 1207: signal(SIGINT, SIG_IGN);
1.61 markus 1208: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1209: signal(SIGHUP, cleanup_handler);
1210: signal(SIGTERM, cleanup_handler);
1.66 markus 1211: nalloc = 0;
1212:
1.21 markus 1213: while (1) {
1.66 markus 1214: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1215: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1216: if (errno == EINTR)
1217: continue;
1.81 stevesk 1218: fatal("select: %s", strerror(errno));
1.21 markus 1219: }
1.46 markus 1220: after_select(readsetp, writesetp);
1.15 markus 1221: }
1.21 markus 1222: /* NOTREACHED */
1.1 deraadt 1223: }
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