Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.155
1.155 ! dtucker 1: /* $OpenBSD: ssh-agent.c,v 1.154 2007/02/28 00:55:30 dtucker 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:
1.151 deraadt 37: #include <sys/types.h>
1.153 djm 38: #include <sys/time.h>
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>
1.148 stevesk 44: #include <sys/param.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>
1.149 stevesk 53: #include <stdlib.h>
1.150 stevesk 54: #include <stdio.h>
1.146 stevesk 55: #include <string.h>
1.145 stevesk 56: #include <time.h>
1.144 stevesk 57: #include <unistd.h>
1.1 deraadt 58:
1.151 deraadt 59: #include "xmalloc.h"
1.1 deraadt 60: #include "ssh.h"
61: #include "rsa.h"
62: #include "buffer.h"
1.32 markus 63: #include "key.h"
64: #include "authfd.h"
1.37 markus 65: #include "compat.h"
1.47 markus 66: #include "log.h"
1.107 markus 67: #include "misc.h"
1.7 deraadt 68:
1.59 markus 69: #ifdef SMARTCARD
70: #include "scard.h"
1.71 jakob 71: #endif
1.59 markus 72:
1.73 stevesk 73: typedef enum {
74: AUTH_UNUSED,
75: AUTH_SOCKET,
76: AUTH_CONNECTION
77: } sock_type;
78:
1.21 markus 79: typedef struct {
80: int fd;
1.73 stevesk 81: sock_type type;
1.21 markus 82: Buffer input;
83: Buffer output;
1.87 markus 84: Buffer request;
1.1 deraadt 85: } SocketEntry;
86:
1.45 markus 87: u_int sockets_alloc = 0;
1.1 deraadt 88: SocketEntry *sockets = NULL;
89:
1.78 provos 90: typedef struct identity {
91: TAILQ_ENTRY(identity) next;
1.33 markus 92: Key *key;
1.21 markus 93: char *comment;
1.89 markus 94: u_int death;
1.107 markus 95: u_int confirm;
1.1 deraadt 96: } Identity;
97:
1.33 markus 98: typedef struct {
99: int nentries;
1.78 provos 100: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 101: } Idtab;
102:
103: /* private key table, one per protocol version */
104: Idtab idtable[3];
1.1 deraadt 105:
106: int max_fd = 0;
107:
1.11 markus 108: /* pid of shell == parent of agent */
1.29 deraadt 109: pid_t parent_pid = -1;
1.155 ! dtucker 110: u_int parent_alive_interval = 0;
1.10 markus 111:
112: /* pathname and directory for AUTH_SOCKET */
1.132 djm 113: char socket_name[MAXPATHLEN];
114: char socket_dir[MAXPATHLEN];
1.10 markus 115:
1.88 markus 116: /* locking */
117: int locked = 0;
118: char *lock_passwd = NULL;
119:
1.20 markus 120: extern char *__progname;
121:
1.106 marc 122: /* Default lifetime (0 == forever) */
123: static int lifetime = 0;
124:
1.55 itojun 125: static void
1.101 stevesk 126: close_socket(SocketEntry *e)
127: {
128: close(e->fd);
129: e->fd = -1;
130: e->type = AUTH_UNUSED;
131: buffer_free(&e->input);
132: buffer_free(&e->output);
133: buffer_free(&e->request);
134: }
135:
136: static void
1.33 markus 137: idtab_init(void)
1.1 deraadt 138: {
1.33 markus 139: int i;
1.96 deraadt 140:
1.74 deraadt 141: for (i = 0; i <=2; i++) {
1.78 provos 142: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 143: idtable[i].nentries = 0;
144: }
145: }
146:
147: /* return private key table for requested protocol version */
1.55 itojun 148: static Idtab *
1.33 markus 149: idtab_lookup(int version)
150: {
151: if (version < 1 || version > 2)
152: fatal("internal error, bad protocol version %d", version);
153: return &idtable[version];
154: }
155:
1.89 markus 156: static void
157: free_identity(Identity *id)
158: {
159: key_free(id->key);
160: xfree(id->comment);
161: xfree(id);
162: }
163:
1.33 markus 164: /* return matching private key for given public key */
1.78 provos 165: static Identity *
166: lookup_identity(Key *key, int version)
1.33 markus 167: {
1.78 provos 168: Identity *id;
169:
1.33 markus 170: Idtab *tab = idtab_lookup(version);
1.78 provos 171: TAILQ_FOREACH(id, &tab->idlist, next) {
172: if (key_equal(key, id->key))
173: return (id);
1.33 markus 174: }
1.78 provos 175: return (NULL);
176: }
177:
1.107 markus 178: /* Check confirmation of keysign request */
179: static int
180: confirm_key(Identity *id)
181: {
1.122 djm 182: char *p;
1.107 markus 183: int ret = -1;
184:
185: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 186: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
187: id->comment, p))
188: ret = 0;
1.107 markus 189: xfree(p);
1.122 djm 190:
1.107 markus 191: return (ret);
192: }
193:
1.33 markus 194: /* send list of supported public keys to 'client' */
1.55 itojun 195: static void
1.33 markus 196: process_request_identities(SocketEntry *e, int version)
197: {
198: Idtab *tab = idtab_lookup(version);
1.96 deraadt 199: Identity *id;
1.21 markus 200: Buffer msg;
1.1 deraadt 201:
1.21 markus 202: buffer_init(&msg);
1.33 markus 203: buffer_put_char(&msg, (version == 1) ?
204: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
205: buffer_put_int(&msg, tab->nentries);
1.78 provos 206: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 207: if (id->key->type == KEY_RSA1) {
1.33 markus 208: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
209: buffer_put_bignum(&msg, id->key->rsa->e);
210: buffer_put_bignum(&msg, id->key->rsa->n);
211: } else {
1.45 markus 212: u_char *blob;
213: u_int blen;
1.39 markus 214: key_to_blob(id->key, &blob, &blen);
1.33 markus 215: buffer_put_string(&msg, blob, blen);
216: xfree(blob);
217: }
218: buffer_put_cstring(&msg, id->comment);
1.21 markus 219: }
220: buffer_put_int(&e->output, buffer_len(&msg));
221: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
222: buffer_free(&msg);
1.1 deraadt 223: }
224:
1.33 markus 225: /* ssh1 only */
1.55 itojun 226: static void
1.33 markus 227: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 228: {
1.96 deraadt 229: u_char buf[32], mdbuf[16], session_id[16];
230: u_int response_type;
231: BIGNUM *challenge;
1.78 provos 232: Identity *id;
1.33 markus 233: int i, len;
1.21 markus 234: Buffer msg;
235: MD5_CTX md;
1.96 deraadt 236: Key *key;
1.21 markus 237:
238: buffer_init(&msg);
1.39 markus 239: key = key_new(KEY_RSA1);
1.76 markus 240: if ((challenge = BN_new()) == NULL)
241: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 242:
1.97 markus 243: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 244: buffer_get_bignum(&e->request, key->rsa->e);
245: buffer_get_bignum(&e->request, key->rsa->n);
246: buffer_get_bignum(&e->request, challenge);
1.21 markus 247:
1.33 markus 248: /* Only protocol 1.1 is supported */
1.87 markus 249: if (buffer_len(&e->request) == 0)
1.33 markus 250: goto failure;
1.87 markus 251: buffer_get(&e->request, session_id, 16);
252: response_type = buffer_get_int(&e->request);
1.33 markus 253: if (response_type != 1)
254: goto failure;
255:
1.78 provos 256: id = lookup_identity(key, 1);
1.107 markus 257: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 258: Key *private = id->key;
1.33 markus 259: /* Decrypt the challenge using the private key. */
1.49 markus 260: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
261: goto failure;
1.33 markus 262:
263: /* The response is MD5 of decrypted challenge plus session id. */
264: len = BN_num_bytes(challenge);
265: if (len <= 0 || len > 32) {
1.109 itojun 266: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 267: goto failure;
268: }
269: memset(buf, 0, 32);
270: BN_bn2bin(challenge, buf + 32 - len);
271: MD5_Init(&md);
272: MD5_Update(&md, buf, 32);
273: MD5_Update(&md, session_id, 16);
274: MD5_Final(mdbuf, &md);
275:
276: /* Send the response. */
277: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
278: for (i = 0; i < 16; i++)
279: buffer_put_char(&msg, mdbuf[i]);
280: goto send;
281: }
1.21 markus 282:
1.33 markus 283: failure:
284: /* Unknown identity or protocol error. Send failure. */
1.21 markus 285: buffer_put_char(&msg, SSH_AGENT_FAILURE);
286: send:
287: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 288: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
289: key_free(key);
290: BN_clear_free(challenge);
291: buffer_free(&msg);
292: }
293:
294: /* ssh2 only */
1.55 itojun 295: static void
1.33 markus 296: process_sign_request2(SocketEntry *e)
297: {
1.45 markus 298: u_char *blob, *data, *signature = NULL;
299: u_int blen, dlen, slen = 0;
1.96 deraadt 300: extern int datafellows;
301: int ok = -1, flags;
1.33 markus 302: Buffer msg;
1.96 deraadt 303: Key *key;
1.33 markus 304:
305: datafellows = 0;
1.43 markus 306:
1.87 markus 307: blob = buffer_get_string(&e->request, &blen);
308: data = buffer_get_string(&e->request, &dlen);
1.37 markus 309:
1.87 markus 310: flags = buffer_get_int(&e->request);
1.37 markus 311: if (flags & SSH_AGENT_OLD_SIGNATURE)
312: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 313:
1.39 markus 314: key = key_from_blob(blob, blen);
1.33 markus 315: if (key != NULL) {
1.78 provos 316: Identity *id = lookup_identity(key, 2);
1.107 markus 317: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 318: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 319: key_free(key);
1.33 markus 320: }
321: buffer_init(&msg);
322: if (ok == 0) {
323: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
324: buffer_put_string(&msg, signature, slen);
325: } else {
326: buffer_put_char(&msg, SSH_AGENT_FAILURE);
327: }
328: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 329: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 330: buffer_len(&msg));
1.21 markus 331: buffer_free(&msg);
1.33 markus 332: xfree(data);
333: xfree(blob);
334: if (signature != NULL)
335: xfree(signature);
1.1 deraadt 336: }
337:
1.33 markus 338: /* shared */
1.55 itojun 339: static void
1.33 markus 340: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 341: {
1.96 deraadt 342: u_int blen, bits;
343: int success = 0;
1.78 provos 344: Key *key = NULL;
1.45 markus 345: u_char *blob;
1.21 markus 346:
1.74 deraadt 347: switch (version) {
1.33 markus 348: case 1:
1.39 markus 349: key = key_new(KEY_RSA1);
1.87 markus 350: bits = buffer_get_int(&e->request);
351: buffer_get_bignum(&e->request, key->rsa->e);
352: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 353:
354: if (bits != key_size(key))
1.109 itojun 355: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 356: key_size(key), bits);
1.33 markus 357: break;
358: case 2:
1.87 markus 359: blob = buffer_get_string(&e->request, &blen);
1.39 markus 360: key = key_from_blob(blob, blen);
1.33 markus 361: xfree(blob);
362: break;
363: }
364: if (key != NULL) {
1.78 provos 365: Identity *id = lookup_identity(key, version);
366: if (id != NULL) {
1.23 markus 367: /*
368: * We have this key. Free the old key. Since we
1.124 djm 369: * don't want to leave empty slots in the middle of
1.40 markus 370: * the array, we actually free the key there and move
371: * all the entries between the empty slot and the end
372: * of the array.
1.23 markus 373: */
1.33 markus 374: Idtab *tab = idtab_lookup(version);
1.38 markus 375: if (tab->nentries < 1)
376: fatal("process_remove_identity: "
377: "internal error: tab->nentries %d",
378: tab->nentries);
1.78 provos 379: TAILQ_REMOVE(&tab->idlist, id, next);
380: free_identity(id);
1.33 markus 381: tab->nentries--;
382: success = 1;
1.21 markus 383: }
1.33 markus 384: key_free(key);
385: }
1.1 deraadt 386: buffer_put_int(&e->output, 1);
1.33 markus 387: buffer_put_char(&e->output,
388: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 389: }
390:
1.55 itojun 391: static void
1.33 markus 392: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 393: {
1.33 markus 394: Idtab *tab = idtab_lookup(version);
1.78 provos 395: Identity *id;
1.21 markus 396:
397: /* Loop over all identities and clear the keys. */
1.78 provos 398: for (id = TAILQ_FIRST(&tab->idlist); id;
399: id = TAILQ_FIRST(&tab->idlist)) {
400: TAILQ_REMOVE(&tab->idlist, id, next);
401: free_identity(id);
1.21 markus 402: }
403:
404: /* Mark that there are no identities. */
1.33 markus 405: tab->nentries = 0;
1.21 markus 406:
407: /* Send success. */
408: buffer_put_int(&e->output, 1);
409: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 410: }
411:
1.155 ! dtucker 412: /* removes expired keys and returns number of seconds until the next expiry */
! 413: static u_int
1.89 markus 414: reaper(void)
415: {
1.155 ! dtucker 416: u_int deadline = 0, now = time(NULL);
1.89 markus 417: Identity *id, *nxt;
418: int version;
1.96 deraadt 419: Idtab *tab;
1.89 markus 420:
421: for (version = 1; version < 3; version++) {
422: tab = idtab_lookup(version);
423: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
424: nxt = TAILQ_NEXT(id, next);
1.155 ! dtucker 425: if (id->death == 0)
! 426: continue;
! 427: if (now >= id->death) {
1.154 dtucker 428: debug("expiring key '%s'", id->comment);
1.89 markus 429: TAILQ_REMOVE(&tab->idlist, id, next);
430: free_identity(id);
431: tab->nentries--;
1.155 ! dtucker 432: } else
! 433: deadline = (deadline == 0) ? id->death :
! 434: MIN(deadline, id->death);
1.89 markus 435: }
436: }
1.155 ! dtucker 437: if (deadline == 0 || deadline <= now)
! 438: return 0;
! 439: else
! 440: return (deadline - now);
1.89 markus 441: }
442:
443: static void
1.33 markus 444: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 445: {
1.96 deraadt 446: Idtab *tab = idtab_lookup(version);
1.107 markus 447: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 448: char *type_name, *comment;
1.33 markus 449: Key *k = NULL;
450:
451: switch (version) {
452: case 1:
1.39 markus 453: k = key_new_private(KEY_RSA1);
1.97 markus 454: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 455: buffer_get_bignum(&e->request, k->rsa->n);
456: buffer_get_bignum(&e->request, k->rsa->e);
457: buffer_get_bignum(&e->request, k->rsa->d);
458: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 459:
460: /* SSH and SSL have p and q swapped */
1.87 markus 461: buffer_get_bignum(&e->request, k->rsa->q); /* p */
462: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 463:
464: /* Generate additional parameters */
1.60 markus 465: rsa_generate_additional_parameters(k->rsa);
1.33 markus 466: break;
467: case 2:
1.87 markus 468: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 469: type = key_type_from_name(type_name);
1.39 markus 470: xfree(type_name);
1.74 deraadt 471: switch (type) {
1.39 markus 472: case KEY_DSA:
473: k = key_new_private(type);
1.87 markus 474: buffer_get_bignum2(&e->request, k->dsa->p);
475: buffer_get_bignum2(&e->request, k->dsa->q);
476: buffer_get_bignum2(&e->request, k->dsa->g);
477: buffer_get_bignum2(&e->request, k->dsa->pub_key);
478: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 479: break;
480: case KEY_RSA:
481: k = key_new_private(type);
1.87 markus 482: buffer_get_bignum2(&e->request, k->rsa->n);
483: buffer_get_bignum2(&e->request, k->rsa->e);
484: buffer_get_bignum2(&e->request, k->rsa->d);
485: buffer_get_bignum2(&e->request, k->rsa->iqmp);
486: buffer_get_bignum2(&e->request, k->rsa->p);
487: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 488:
489: /* Generate additional parameters */
1.60 markus 490: rsa_generate_additional_parameters(k->rsa);
1.39 markus 491: break;
492: default:
1.87 markus 493: buffer_clear(&e->request);
1.108 markus 494: goto send;
495: }
496: break;
497: }
498: /* enable blinding */
499: switch (k->type) {
500: case KEY_RSA:
501: case KEY_RSA1:
502: if (RSA_blinding_on(k->rsa, NULL) != 1) {
503: error("process_add_identity: RSA_blinding_on failed");
504: key_free(k);
1.33 markus 505: goto send;
1.21 markus 506: }
1.33 markus 507: break;
508: }
1.87 markus 509: comment = buffer_get_string(&e->request, NULL);
1.33 markus 510: if (k == NULL) {
511: xfree(comment);
512: goto send;
513: }
514: success = 1;
1.94 markus 515: while (buffer_len(&e->request)) {
516: switch (buffer_get_char(&e->request)) {
517: case SSH_AGENT_CONSTRAIN_LIFETIME:
518: death = time(NULL) + buffer_get_int(&e->request);
519: break;
1.107 markus 520: case SSH_AGENT_CONSTRAIN_CONFIRM:
521: confirm = 1;
522: break;
1.94 markus 523: default:
524: break;
525: }
526: }
1.106 marc 527: if (lifetime && !death)
528: death = time(NULL) + lifetime;
1.78 provos 529: if (lookup_identity(k, version) == NULL) {
530: Identity *id = xmalloc(sizeof(Identity));
531: id->key = k;
532: id->comment = comment;
1.94 markus 533: id->death = death;
1.107 markus 534: id->confirm = confirm;
1.78 provos 535: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 536: /* Increment the number of identities. */
537: tab->nentries++;
538: } else {
539: key_free(k);
540: xfree(comment);
541: }
542: send:
1.1 deraadt 543: buffer_put_int(&e->output, 1);
1.33 markus 544: buffer_put_char(&e->output,
545: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 546: }
547:
1.88 markus 548: /* XXX todo: encrypt sensitive data with passphrase */
549: static void
550: process_lock_agent(SocketEntry *e, int lock)
551: {
1.96 deraadt 552: int success = 0;
1.88 markus 553: char *passwd;
554:
555: passwd = buffer_get_string(&e->request, NULL);
556: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
557: locked = 0;
558: memset(lock_passwd, 0, strlen(lock_passwd));
559: xfree(lock_passwd);
560: lock_passwd = NULL;
561: success = 1;
562: } else if (!locked && lock) {
563: locked = 1;
564: lock_passwd = xstrdup(passwd);
565: success = 1;
566: }
567: memset(passwd, 0, strlen(passwd));
568: xfree(passwd);
1.95 deraadt 569:
1.88 markus 570: buffer_put_int(&e->output, 1);
571: buffer_put_char(&e->output,
572: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
573: }
574:
575: static void
576: no_identities(SocketEntry *e, u_int type)
577: {
578: Buffer msg;
579:
580: buffer_init(&msg);
581: buffer_put_char(&msg,
582: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
583: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
584: buffer_put_int(&msg, 0);
585: buffer_put_int(&e->output, buffer_len(&msg));
586: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
587: buffer_free(&msg);
588: }
1.59 markus 589:
590: #ifdef SMARTCARD
591: static void
592: process_add_smartcard_key (SocketEntry *e)
593: {
1.96 deraadt 594: char *sc_reader_id = NULL, *pin;
1.110 djm 595: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 596: Key **keys, *k;
1.84 markus 597: Identity *id;
1.59 markus 598: Idtab *tab;
1.75 deraadt 599:
1.87 markus 600: sc_reader_id = buffer_get_string(&e->request, NULL);
601: pin = buffer_get_string(&e->request, NULL);
1.110 djm 602:
603: while (buffer_len(&e->request)) {
604: switch (buffer_get_char(&e->request)) {
605: case SSH_AGENT_CONSTRAIN_LIFETIME:
606: death = time(NULL) + buffer_get_int(&e->request);
607: break;
608: case SSH_AGENT_CONSTRAIN_CONFIRM:
609: confirm = 1;
610: break;
611: default:
612: break;
613: }
614: }
615: if (lifetime && !death)
616: death = time(NULL) + lifetime;
617:
1.84 markus 618: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 619: xfree(sc_reader_id);
1.83 rees 620: xfree(pin);
1.59 markus 621:
1.84 markus 622: if (keys == NULL || keys[0] == NULL) {
623: error("sc_get_keys failed");
1.59 markus 624: goto send;
625: }
1.84 markus 626: for (i = 0; keys[i] != NULL; i++) {
627: k = keys[i];
628: version = k->type == KEY_RSA1 ? 1 : 2;
629: tab = idtab_lookup(version);
630: if (lookup_identity(k, version) == NULL) {
631: id = xmalloc(sizeof(Identity));
632: id->key = k;
1.111 markus 633: id->comment = sc_get_key_label(k);
1.110 djm 634: id->death = death;
635: id->confirm = confirm;
1.84 markus 636: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
637: tab->nentries++;
638: success = 1;
639: } else {
640: key_free(k);
641: }
642: keys[i] = NULL;
1.59 markus 643: }
1.84 markus 644: xfree(keys);
1.59 markus 645: send:
646: buffer_put_int(&e->output, 1);
647: buffer_put_char(&e->output,
648: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
649: }
650:
651: static void
652: process_remove_smartcard_key(SocketEntry *e)
653: {
1.96 deraadt 654: char *sc_reader_id = NULL, *pin;
655: int i, version, success = 0;
656: Key **keys, *k = NULL;
1.84 markus 657: Identity *id;
658: Idtab *tab;
1.59 markus 659:
1.87 markus 660: sc_reader_id = buffer_get_string(&e->request, NULL);
661: pin = buffer_get_string(&e->request, NULL);
1.84 markus 662: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 663: xfree(sc_reader_id);
1.83 rees 664: xfree(pin);
1.59 markus 665:
1.84 markus 666: if (keys == NULL || keys[0] == NULL) {
667: error("sc_get_keys failed");
668: goto send;
669: }
670: for (i = 0; keys[i] != NULL; i++) {
671: k = keys[i];
672: version = k->type == KEY_RSA1 ? 1 : 2;
673: if ((id = lookup_identity(k, version)) != NULL) {
674: tab = idtab_lookup(version);
1.90 markus 675: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 676: tab->nentries--;
1.78 provos 677: free_identity(id);
1.59 markus 678: success = 1;
679: }
680: key_free(k);
1.84 markus 681: keys[i] = NULL;
1.59 markus 682: }
1.84 markus 683: xfree(keys);
684: send:
1.59 markus 685: buffer_put_int(&e->output, 1);
686: buffer_put_char(&e->output,
687: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
688: }
1.70 jakob 689: #endif /* SMARTCARD */
1.59 markus 690:
1.33 markus 691: /* dispatch incoming messages */
692:
1.55 itojun 693: static void
1.2 provos 694: process_message(SocketEntry *e)
1.1 deraadt 695: {
1.96 deraadt 696: u_int msg_len, type;
1.45 markus 697: u_char *cp;
1.89 markus 698:
1.21 markus 699: if (buffer_len(&e->input) < 5)
700: return; /* Incomplete message. */
1.77 stevesk 701: cp = buffer_ptr(&e->input);
1.137 djm 702: msg_len = get_u32(cp);
1.21 markus 703: if (msg_len > 256 * 1024) {
1.101 stevesk 704: close_socket(e);
1.21 markus 705: return;
706: }
707: if (buffer_len(&e->input) < msg_len + 4)
708: return;
1.87 markus 709:
710: /* move the current input to e->request */
1.21 markus 711: buffer_consume(&e->input, 4);
1.87 markus 712: buffer_clear(&e->request);
713: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
714: buffer_consume(&e->input, msg_len);
715: type = buffer_get_char(&e->request);
1.21 markus 716:
1.88 markus 717: /* check wheter agent is locked */
718: if (locked && type != SSH_AGENTC_UNLOCK) {
719: buffer_clear(&e->request);
720: switch (type) {
721: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
722: case SSH2_AGENTC_REQUEST_IDENTITIES:
723: /* send empty lists */
724: no_identities(e, type);
725: break;
726: default:
727: /* send a fail message for all other request types */
728: buffer_put_int(&e->output, 1);
729: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
730: }
731: return;
732: }
733:
1.59 markus 734: debug("type %d", type);
1.21 markus 735: switch (type) {
1.88 markus 736: case SSH_AGENTC_LOCK:
737: case SSH_AGENTC_UNLOCK:
738: process_lock_agent(e, type == SSH_AGENTC_LOCK);
739: break;
1.33 markus 740: /* ssh1 */
741: case SSH_AGENTC_RSA_CHALLENGE:
742: process_authentication_challenge1(e);
743: break;
1.21 markus 744: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 745: process_request_identities(e, 1);
1.21 markus 746: break;
747: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 748: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 749: process_add_identity(e, 1);
1.21 markus 750: break;
751: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 752: process_remove_identity(e, 1);
1.21 markus 753: break;
754: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 755: process_remove_all_identities(e, 1);
756: break;
757: /* ssh2 */
758: case SSH2_AGENTC_SIGN_REQUEST:
759: process_sign_request2(e);
760: break;
761: case SSH2_AGENTC_REQUEST_IDENTITIES:
762: process_request_identities(e, 2);
763: break;
764: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 765: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 766: process_add_identity(e, 2);
767: break;
768: case SSH2_AGENTC_REMOVE_IDENTITY:
769: process_remove_identity(e, 2);
770: break;
771: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
772: process_remove_all_identities(e, 2);
1.21 markus 773: break;
1.59 markus 774: #ifdef SMARTCARD
775: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 776: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 777: process_add_smartcard_key(e);
1.75 deraadt 778: break;
1.59 markus 779: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
780: process_remove_smartcard_key(e);
1.75 deraadt 781: break;
1.70 jakob 782: #endif /* SMARTCARD */
1.21 markus 783: default:
784: /* Unknown message. Respond with failure. */
785: error("Unknown message %d", type);
1.87 markus 786: buffer_clear(&e->request);
1.21 markus 787: buffer_put_int(&e->output, 1);
788: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
789: break;
790: }
1.1 deraadt 791: }
792:
1.55 itojun 793: static void
1.73 stevesk 794: new_socket(sock_type type, int fd)
1.1 deraadt 795: {
1.112 markus 796: u_int i, old_alloc, new_alloc;
1.96 deraadt 797:
1.119 djm 798: set_nonblock(fd);
1.21 markus 799:
800: if (fd > max_fd)
801: max_fd = fd;
802:
803: for (i = 0; i < sockets_alloc; i++)
804: if (sockets[i].type == AUTH_UNUSED) {
805: sockets[i].fd = fd;
806: buffer_init(&sockets[i].input);
807: buffer_init(&sockets[i].output);
1.87 markus 808: buffer_init(&sockets[i].request);
1.112 markus 809: sockets[i].type = type;
1.21 markus 810: return;
811: }
812: old_alloc = sockets_alloc;
1.112 markus 813: new_alloc = sockets_alloc + 10;
1.133 djm 814: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 815: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 816: sockets[i].type = AUTH_UNUSED;
1.112 markus 817: sockets_alloc = new_alloc;
1.21 markus 818: sockets[old_alloc].fd = fd;
819: buffer_init(&sockets[old_alloc].input);
820: buffer_init(&sockets[old_alloc].output);
1.87 markus 821: buffer_init(&sockets[old_alloc].request);
1.112 markus 822: sockets[old_alloc].type = type;
1.1 deraadt 823: }
824:
1.55 itojun 825: static int
1.155 ! dtucker 826: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
! 827: struct timeval **tvpp)
1.1 deraadt 828: {
1.155 ! dtucker 829: u_int i, sz, deadline;
1.46 markus 830: int n = 0;
1.155 ! dtucker 831: static struct timeval tv;
1.46 markus 832:
833: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 834: switch (sockets[i].type) {
835: case AUTH_SOCKET:
836: case AUTH_CONNECTION:
1.46 markus 837: n = MAX(n, sockets[i].fd);
1.21 markus 838: break;
839: case AUTH_UNUSED:
840: break;
841: default:
842: fatal("Unknown socket type %d", sockets[i].type);
843: break;
844: }
1.46 markus 845: }
846:
847: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 848: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 849: if (*fdrp)
1.54 stevesk 850: xfree(*fdrp);
1.46 markus 851: if (*fdwp)
1.54 stevesk 852: xfree(*fdwp);
1.46 markus 853: *fdrp = xmalloc(sz);
854: *fdwp = xmalloc(sz);
1.66 markus 855: *nallocp = sz;
1.46 markus 856: }
1.66 markus 857: if (n < *fdl)
858: debug("XXX shrink: %d < %d", n, *fdl);
859: *fdl = n;
1.46 markus 860: memset(*fdrp, 0, sz);
861: memset(*fdwp, 0, sz);
862:
863: for (i = 0; i < sockets_alloc; i++) {
864: switch (sockets[i].type) {
865: case AUTH_SOCKET:
866: case AUTH_CONNECTION:
867: FD_SET(sockets[i].fd, *fdrp);
868: if (buffer_len(&sockets[i].output) > 0)
869: FD_SET(sockets[i].fd, *fdwp);
870: break;
871: default:
872: break;
873: }
874: }
1.155 ! dtucker 875: deadline = reaper();
! 876: if (parent_alive_interval != 0)
! 877: deadline = (deadline == 0) ? parent_alive_interval :
! 878: MIN(deadline, parent_alive_interval);
! 879: if (deadline == 0) {
! 880: *tvpp = NULL;
! 881: } else {
! 882: tv.tv_sec = deadline;
! 883: tv.tv_usec = 0;
! 884: *tvpp = &tv;
! 885: }
1.46 markus 886: return (1);
1.21 markus 887: }
888:
1.55 itojun 889: static void
1.21 markus 890: after_select(fd_set *readset, fd_set *writeset)
891: {
1.96 deraadt 892: struct sockaddr_un sunaddr;
1.26 markus 893: socklen_t slen;
1.21 markus 894: char buf[1024];
1.96 deraadt 895: int len, sock;
896: u_int i;
1.103 markus 897: uid_t euid;
898: gid_t egid;
1.21 markus 899:
900: for (i = 0; i < sockets_alloc; i++)
901: switch (sockets[i].type) {
902: case AUTH_UNUSED:
903: break;
904: case AUTH_SOCKET:
905: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 906: slen = sizeof(sunaddr);
1.46 markus 907: sock = accept(sockets[i].fd,
1.131 deraadt 908: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 909: if (sock < 0) {
1.81 stevesk 910: error("accept from AUTH_SOCKET: %s",
911: strerror(errno));
1.103 markus 912: break;
913: }
914: if (getpeereid(sock, &euid, &egid) < 0) {
915: error("getpeereid %d failed: %s",
916: sock, strerror(errno));
917: close(sock);
918: break;
919: }
1.105 markus 920: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 921: error("uid mismatch: "
1.104 stevesk 922: "peer euid %u != uid %u",
923: (u_int) euid, (u_int) getuid());
1.103 markus 924: close(sock);
1.21 markus 925: break;
926: }
927: new_socket(AUTH_CONNECTION, sock);
928: }
929: break;
930: case AUTH_CONNECTION:
931: if (buffer_len(&sockets[i].output) > 0 &&
932: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 933: do {
934: len = write(sockets[i].fd,
935: buffer_ptr(&sockets[i].output),
936: buffer_len(&sockets[i].output));
937: if (len == -1 && (errno == EAGAIN ||
938: errno == EINTR))
939: continue;
940: break;
941: } while (1);
1.21 markus 942: if (len <= 0) {
1.101 stevesk 943: close_socket(&sockets[i]);
1.21 markus 944: break;
945: }
946: buffer_consume(&sockets[i].output, len);
947: }
948: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 949: do {
950: len = read(sockets[i].fd, buf, sizeof(buf));
951: if (len == -1 && (errno == EAGAIN ||
952: errno == EINTR))
953: continue;
954: break;
955: } while (1);
1.21 markus 956: if (len <= 0) {
1.101 stevesk 957: close_socket(&sockets[i]);
1.21 markus 958: break;
959: }
960: buffer_append(&sockets[i].input, buf, len);
961: process_message(&sockets[i]);
962: }
963: break;
964: default:
965: fatal("Unknown type %d", sockets[i].type);
966: }
1.1 deraadt 967: }
968:
1.55 itojun 969: static void
1.113 markus 970: cleanup_socket(void)
1.15 markus 971: {
1.48 deraadt 972: if (socket_name[0])
973: unlink(socket_name);
974: if (socket_dir[0])
975: rmdir(socket_dir);
1.10 markus 976: }
977:
1.114 markus 978: void
1.15 markus 979: cleanup_exit(int i)
980: {
1.113 markus 981: cleanup_socket();
982: _exit(i);
1.15 markus 983: }
984:
1.135 deraadt 985: /*ARGSUSED*/
1.55 itojun 986: static void
1.48 deraadt 987: cleanup_handler(int sig)
988: {
1.113 markus 989: cleanup_socket();
1.48 deraadt 990: _exit(2);
1.113 markus 991: }
992:
1.68 markus 993: static void
1.155 ! dtucker 994: check_parent_exists(void)
1.68 markus 995: {
996: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
997: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 ! dtucker 998: cleanup_socket();
! 999: _exit(2);
1.68 markus 1000: }
1.48 deraadt 1001: }
1002:
1.55 itojun 1003: static void
1.50 itojun 1004: usage(void)
1.15 markus 1005: {
1.72 jakob 1006: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 1007: __progname);
1.72 jakob 1008: fprintf(stderr, "Options:\n");
1009: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
1010: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
1011: fprintf(stderr, " -k Kill the current agent.\n");
1012: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 1013: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 1014: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 1015: exit(1);
1.15 markus 1016: }
1017:
1.2 provos 1018: int
1019: main(int ac, char **av)
1.1 deraadt 1020: {
1.107 markus 1021: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1022: int sock, fd, ch, result, saved_errno;
1.120 avsm 1023: u_int nalloc;
1.96 deraadt 1024: char *shell, *format, *pidstr, *agentsocket = NULL;
1025: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1026: struct sockaddr_un sunaddr;
1.41 markus 1027: struct rlimit rlim;
1.96 deraadt 1028: extern int optind;
1.98 stevesk 1029: extern char *optarg;
1.21 markus 1030: pid_t pid;
1.96 deraadt 1031: char pidstrbuf[1 + 3 * sizeof pid];
1.155 ! dtucker 1032: struct timeval *tvp = NULL;
1.123 djm 1033:
1034: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1035: sanitise_stdfd();
1.99 markus 1036:
1037: /* drop */
1038: setegid(getgid());
1039: setgid(getgid());
1.53 markus 1040:
1041: SSLeay_add_all_algorithms();
1.21 markus 1042:
1.106 marc 1043: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1044: switch (ch) {
1045: case 'c':
1046: if (s_flag)
1047: usage();
1048: c_flag++;
1049: break;
1050: case 'k':
1051: k_flag++;
1052: break;
1053: case 's':
1054: if (c_flag)
1055: usage();
1056: s_flag++;
1057: break;
1.57 markus 1058: case 'd':
1059: if (d_flag)
1060: usage();
1061: d_flag++;
1062: break;
1.86 markus 1063: case 'a':
1064: agentsocket = optarg;
1.106 marc 1065: break;
1066: case 't':
1067: if ((lifetime = convtime(optarg)) == -1) {
1068: fprintf(stderr, "Invalid lifetime\n");
1069: usage();
1070: }
1.86 markus 1071: break;
1.21 markus 1072: default:
1073: usage();
1074: }
1075: }
1076: ac -= optind;
1077: av += optind;
1078:
1.57 markus 1079: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1080: usage();
1081:
1.85 markus 1082: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1083: shell = getenv("SHELL");
1.136 deraadt 1084: if (shell != NULL &&
1085: strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1.21 markus 1086: c_flag = 1;
1087: }
1088: if (k_flag) {
1.136 deraadt 1089: const char *errstr = NULL;
1090:
1.21 markus 1091: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1092: if (pidstr == NULL) {
1093: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1094: SSH_AGENTPID_ENV_NAME);
1.21 markus 1095: exit(1);
1096: }
1.136 deraadt 1097: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1098: if (errstr) {
1099: fprintf(stderr,
1100: "%s=\"%s\", which is not a good PID: %s\n",
1101: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1102: exit(1);
1103: }
1104: if (kill(pid, SIGTERM) == -1) {
1105: perror("kill");
1106: exit(1);
1107: }
1108: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1109: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1110: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1111: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1112: exit(0);
1113: }
1114: parent_pid = getpid();
1115:
1.86 markus 1116: if (agentsocket == NULL) {
1117: /* Create private directory for agent socket */
1.115 markus 1118: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1119: if (mkdtemp(socket_dir) == NULL) {
1120: perror("mkdtemp: private socket dir");
1121: exit(1);
1122: }
1.91 mpech 1123: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1124: (long)parent_pid);
1.86 markus 1125: } else {
1126: /* Try to use specified agent socket */
1127: socket_dir[0] = '\0';
1128: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1129: }
1130:
1.23 markus 1131: /*
1132: * Create socket early so it will exist before command gets run from
1133: * the parent.
1134: */
1.21 markus 1135: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1136: if (sock < 0) {
1137: perror("socket");
1.121 djm 1138: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1139: cleanup_exit(1);
1140: }
1141: memset(&sunaddr, 0, sizeof(sunaddr));
1142: sunaddr.sun_family = AF_UNIX;
1143: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1144: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1145: perror("bind");
1.121 djm 1146: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1147: cleanup_exit(1);
1148: }
1.117 markus 1149: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1150: perror("listen");
1151: cleanup_exit(1);
1152: }
1.46 markus 1153:
1.23 markus 1154: /*
1155: * Fork, and have the parent execute the command, if any, or present
1156: * the socket data. The child continues as the authentication agent.
1157: */
1.57 markus 1158: if (d_flag) {
1159: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1160: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1161: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1162: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1163: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1164: goto skip;
1165: }
1.21 markus 1166: pid = fork();
1167: if (pid == -1) {
1168: perror("fork");
1.81 stevesk 1169: cleanup_exit(1);
1.21 markus 1170: }
1171: if (pid != 0) { /* Parent - execute the given command. */
1172: close(sock);
1.91 mpech 1173: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1174: if (ac == 0) {
1175: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1176: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1177: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1178: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1179: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1180: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1181: exit(0);
1182: }
1.36 deraadt 1183: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1184: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1185: perror("setenv");
1186: exit(1);
1187: }
1.21 markus 1188: execvp(av[0], av);
1189: perror(av[0]);
1190: exit(1);
1191: }
1.81 stevesk 1192: /* child */
1193: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1194:
1195: if (setsid() == -1) {
1.81 stevesk 1196: error("setsid: %s", strerror(errno));
1.67 stevesk 1197: cleanup_exit(1);
1198: }
1199:
1200: (void)chdir("/");
1.107 markus 1201: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1202: /* XXX might close listen socket */
1203: (void)dup2(fd, STDIN_FILENO);
1204: (void)dup2(fd, STDOUT_FILENO);
1205: (void)dup2(fd, STDERR_FILENO);
1206: if (fd > 2)
1207: close(fd);
1208: }
1.21 markus 1209:
1.41 markus 1210: /* deny core dumps, since memory contains unencrypted private keys */
1211: rlim.rlim_cur = rlim.rlim_max = 0;
1212: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1213: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1214: cleanup_exit(1);
1215: }
1.57 markus 1216:
1217: skip:
1.21 markus 1218: new_socket(AUTH_SOCKET, sock);
1.155 ! dtucker 1219: if (ac > 0)
! 1220: parent_alive_interval = 10;
1.33 markus 1221: idtab_init();
1.61 markus 1222: if (!d_flag)
1.57 markus 1223: signal(SIGINT, SIG_IGN);
1.61 markus 1224: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1225: signal(SIGHUP, cleanup_handler);
1226: signal(SIGTERM, cleanup_handler);
1.66 markus 1227: nalloc = 0;
1228:
1.21 markus 1229: while (1) {
1.155 ! dtucker 1230: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
! 1231: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1232: saved_errno = errno;
1.155 ! dtucker 1233: if (parent_alive_interval != 0)
! 1234: check_parent_exists();
! 1235: (void) reaper(); /* remove expired keys */
1.154 dtucker 1236: if (result < 0) {
1237: if (saved_errno == EINTR)
1.21 markus 1238: continue;
1.154 dtucker 1239: fatal("select: %s", strerror(saved_errno));
1240: } else if (result > 0)
1241: after_select(readsetp, writesetp);
1.15 markus 1242: }
1.21 markus 1243: /* NOTREACHED */
1.1 deraadt 1244: }
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