Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.193
1.193 ! jmc 1: /* $OpenBSD: ssh-agent.c,v 1.192 2014/12/21 22:27:56 djm 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>
1.141 stevesk 41: #include <sys/socket.h>
1.189 djm 42: #include <sys/stat.h>
1.128 stevesk 43: #include <sys/un.h>
1.148 stevesk 44: #include <sys/param.h>
1.126 stevesk 45:
1.185 markus 46: #ifdef WITH_OPENSSL
1.146 stevesk 47: #include <openssl/evp.h>
1.185 markus 48: #endif
1.146 stevesk 49:
1.143 stevesk 50: #include <errno.h>
1.142 stevesk 51: #include <fcntl.h>
1.126 stevesk 52: #include <paths.h>
1.129 stevesk 53: #include <signal.h>
1.149 stevesk 54: #include <stdlib.h>
1.150 stevesk 55: #include <stdio.h>
1.146 stevesk 56: #include <string.h>
1.145 stevesk 57: #include <time.h>
1.144 stevesk 58: #include <unistd.h>
1.1 deraadt 59:
1.151 deraadt 60: #include "xmalloc.h"
1.1 deraadt 61: #include "ssh.h"
62: #include "rsa.h"
63: #include "buffer.h"
1.32 markus 64: #include "key.h"
65: #include "authfd.h"
1.37 markus 66: #include "compat.h"
1.47 markus 67: #include "log.h"
1.107 markus 68: #include "misc.h"
1.182 markus 69: #include "digest.h"
1.7 deraadt 70:
1.163 markus 71: #ifdef ENABLE_PKCS11
72: #include "ssh-pkcs11.h"
1.71 jakob 73: #endif
1.59 markus 74:
1.73 stevesk 75: typedef enum {
76: AUTH_UNUSED,
77: AUTH_SOCKET,
78: AUTH_CONNECTION
79: } sock_type;
80:
1.21 markus 81: typedef struct {
82: int fd;
1.73 stevesk 83: sock_type type;
1.21 markus 84: Buffer input;
85: Buffer output;
1.87 markus 86: Buffer request;
1.1 deraadt 87: } SocketEntry;
88:
1.45 markus 89: u_int sockets_alloc = 0;
1.1 deraadt 90: SocketEntry *sockets = NULL;
91:
1.78 provos 92: typedef struct identity {
93: TAILQ_ENTRY(identity) next;
1.33 markus 94: Key *key;
1.21 markus 95: char *comment;
1.163 markus 96: char *provider;
1.174 dtucker 97: time_t death;
1.107 markus 98: u_int confirm;
1.1 deraadt 99: } Identity;
100:
1.33 markus 101: typedef struct {
102: int nentries;
1.78 provos 103: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 104: } Idtab;
105:
106: /* private key table, one per protocol version */
107: Idtab idtable[3];
1.1 deraadt 108:
109: int max_fd = 0;
110:
1.11 markus 111: /* pid of shell == parent of agent */
1.29 deraadt 112: pid_t parent_pid = -1;
1.176 dtucker 113: time_t parent_alive_interval = 0;
1.10 markus 114:
1.187 djm 115: /* pid of process for which cleanup_socket is applicable */
116: pid_t cleanup_pid = 0;
117:
1.10 markus 118: /* pathname and directory for AUTH_SOCKET */
1.132 djm 119: char socket_name[MAXPATHLEN];
120: char socket_dir[MAXPATHLEN];
1.10 markus 121:
1.88 markus 122: /* locking */
123: int locked = 0;
124: char *lock_passwd = NULL;
125:
1.20 markus 126: extern char *__progname;
127:
1.174 dtucker 128: /* Default lifetime in seconds (0 == forever) */
129: static long lifetime = 0;
1.106 marc 130:
1.192 djm 131: static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
132:
1.55 itojun 133: static void
1.101 stevesk 134: close_socket(SocketEntry *e)
135: {
136: close(e->fd);
137: e->fd = -1;
138: e->type = AUTH_UNUSED;
139: buffer_free(&e->input);
140: buffer_free(&e->output);
141: buffer_free(&e->request);
142: }
143:
144: static void
1.33 markus 145: idtab_init(void)
1.1 deraadt 146: {
1.33 markus 147: int i;
1.96 deraadt 148:
1.74 deraadt 149: for (i = 0; i <=2; i++) {
1.78 provos 150: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 151: idtable[i].nentries = 0;
152: }
153: }
154:
155: /* return private key table for requested protocol version */
1.55 itojun 156: static Idtab *
1.33 markus 157: idtab_lookup(int version)
158: {
159: if (version < 1 || version > 2)
160: fatal("internal error, bad protocol version %d", version);
161: return &idtable[version];
162: }
163:
1.89 markus 164: static void
165: free_identity(Identity *id)
166: {
167: key_free(id->key);
1.173 djm 168: free(id->provider);
169: free(id->comment);
170: free(id);
1.89 markus 171: }
172:
1.33 markus 173: /* return matching private key for given public key */
1.78 provos 174: static Identity *
175: lookup_identity(Key *key, int version)
1.33 markus 176: {
1.78 provos 177: Identity *id;
178:
1.33 markus 179: Idtab *tab = idtab_lookup(version);
1.78 provos 180: TAILQ_FOREACH(id, &tab->idlist, next) {
181: if (key_equal(key, id->key))
182: return (id);
1.33 markus 183: }
1.78 provos 184: return (NULL);
185: }
186:
1.107 markus 187: /* Check confirmation of keysign request */
188: static int
189: confirm_key(Identity *id)
190: {
1.122 djm 191: char *p;
1.107 markus 192: int ret = -1;
193:
1.192 djm 194: p = key_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT);
1.122 djm 195: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
196: id->comment, p))
197: ret = 0;
1.173 djm 198: free(p);
1.122 djm 199:
1.107 markus 200: return (ret);
201: }
202:
1.33 markus 203: /* send list of supported public keys to 'client' */
1.55 itojun 204: static void
1.33 markus 205: process_request_identities(SocketEntry *e, int version)
206: {
207: Idtab *tab = idtab_lookup(version);
1.96 deraadt 208: Identity *id;
1.21 markus 209: Buffer msg;
1.1 deraadt 210:
1.21 markus 211: buffer_init(&msg);
1.33 markus 212: buffer_put_char(&msg, (version == 1) ?
213: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
214: buffer_put_int(&msg, tab->nentries);
1.78 provos 215: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 216: if (id->key->type == KEY_RSA1) {
1.185 markus 217: #ifdef WITH_SSH1
1.33 markus 218: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
219: buffer_put_bignum(&msg, id->key->rsa->e);
220: buffer_put_bignum(&msg, id->key->rsa->n);
1.185 markus 221: #endif
1.33 markus 222: } else {
1.45 markus 223: u_char *blob;
224: u_int blen;
1.39 markus 225: key_to_blob(id->key, &blob, &blen);
1.33 markus 226: buffer_put_string(&msg, blob, blen);
1.173 djm 227: free(blob);
1.33 markus 228: }
229: buffer_put_cstring(&msg, id->comment);
1.21 markus 230: }
231: buffer_put_int(&e->output, buffer_len(&msg));
232: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
233: buffer_free(&msg);
1.1 deraadt 234: }
235:
1.185 markus 236: #ifdef WITH_SSH1
1.33 markus 237: /* ssh1 only */
1.55 itojun 238: static void
1.33 markus 239: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 240: {
1.96 deraadt 241: u_char buf[32], mdbuf[16], session_id[16];
242: u_int response_type;
243: BIGNUM *challenge;
1.78 provos 244: Identity *id;
1.33 markus 245: int i, len;
1.21 markus 246: Buffer msg;
1.182 markus 247: struct ssh_digest_ctx *md;
1.96 deraadt 248: Key *key;
1.21 markus 249:
250: buffer_init(&msg);
1.39 markus 251: key = key_new(KEY_RSA1);
1.76 markus 252: if ((challenge = BN_new()) == NULL)
253: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 254:
1.97 markus 255: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 256: buffer_get_bignum(&e->request, key->rsa->e);
257: buffer_get_bignum(&e->request, key->rsa->n);
258: buffer_get_bignum(&e->request, challenge);
1.21 markus 259:
1.33 markus 260: /* Only protocol 1.1 is supported */
1.87 markus 261: if (buffer_len(&e->request) == 0)
1.33 markus 262: goto failure;
1.87 markus 263: buffer_get(&e->request, session_id, 16);
264: response_type = buffer_get_int(&e->request);
1.33 markus 265: if (response_type != 1)
266: goto failure;
267:
1.78 provos 268: id = lookup_identity(key, 1);
1.107 markus 269: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 270: Key *private = id->key;
1.33 markus 271: /* Decrypt the challenge using the private key. */
1.186 djm 272: if (rsa_private_decrypt(challenge, challenge, private->rsa) != 0)
1.49 markus 273: goto failure;
1.33 markus 274:
275: /* The response is MD5 of decrypted challenge plus session id. */
276: len = BN_num_bytes(challenge);
277: if (len <= 0 || len > 32) {
1.109 itojun 278: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 279: goto failure;
280: }
281: memset(buf, 0, 32);
282: BN_bn2bin(challenge, buf + 32 - len);
1.182 markus 283: if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
284: ssh_digest_update(md, buf, 32) < 0 ||
285: ssh_digest_update(md, session_id, 16) < 0 ||
286: ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
287: fatal("%s: md5 failed", __func__);
288: ssh_digest_free(md);
1.33 markus 289:
290: /* Send the response. */
291: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
292: for (i = 0; i < 16; i++)
293: buffer_put_char(&msg, mdbuf[i]);
294: goto send;
295: }
1.21 markus 296:
1.33 markus 297: failure:
298: /* Unknown identity or protocol error. Send failure. */
1.21 markus 299: buffer_put_char(&msg, SSH_AGENT_FAILURE);
300: send:
301: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 302: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
303: key_free(key);
304: BN_clear_free(challenge);
305: buffer_free(&msg);
306: }
1.185 markus 307: #endif
1.33 markus 308:
309: /* ssh2 only */
1.55 itojun 310: static void
1.33 markus 311: process_sign_request2(SocketEntry *e)
312: {
1.45 markus 313: u_char *blob, *data, *signature = NULL;
314: u_int blen, dlen, slen = 0;
1.96 deraadt 315: extern int datafellows;
1.159 djm 316: int odatafellows;
1.96 deraadt 317: int ok = -1, flags;
1.33 markus 318: Buffer msg;
1.96 deraadt 319: Key *key;
1.33 markus 320:
321: datafellows = 0;
1.43 markus 322:
1.87 markus 323: blob = buffer_get_string(&e->request, &blen);
324: data = buffer_get_string(&e->request, &dlen);
1.37 markus 325:
1.87 markus 326: flags = buffer_get_int(&e->request);
1.159 djm 327: odatafellows = datafellows;
1.37 markus 328: if (flags & SSH_AGENT_OLD_SIGNATURE)
329: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 330:
1.39 markus 331: key = key_from_blob(blob, blen);
1.33 markus 332: if (key != NULL) {
1.78 provos 333: Identity *id = lookup_identity(key, 2);
1.107 markus 334: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 335: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 336: key_free(key);
1.33 markus 337: }
338: buffer_init(&msg);
339: if (ok == 0) {
340: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
341: buffer_put_string(&msg, signature, slen);
342: } else {
343: buffer_put_char(&msg, SSH_AGENT_FAILURE);
344: }
345: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 346: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 347: buffer_len(&msg));
1.21 markus 348: buffer_free(&msg);
1.173 djm 349: free(data);
350: free(blob);
351: free(signature);
1.159 djm 352: datafellows = odatafellows;
1.1 deraadt 353: }
354:
1.33 markus 355: /* shared */
1.55 itojun 356: static void
1.33 markus 357: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 358: {
1.186 djm 359: u_int blen;
1.96 deraadt 360: int success = 0;
1.78 provos 361: Key *key = NULL;
1.45 markus 362: u_char *blob;
1.186 djm 363: #ifdef WITH_SSH1
364: u_int bits;
365: #endif /* WITH_SSH1 */
1.21 markus 366:
1.74 deraadt 367: switch (version) {
1.186 djm 368: #ifdef WITH_SSH1
1.33 markus 369: case 1:
1.39 markus 370: key = key_new(KEY_RSA1);
1.87 markus 371: bits = buffer_get_int(&e->request);
372: buffer_get_bignum(&e->request, key->rsa->e);
373: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 374:
375: if (bits != key_size(key))
1.109 itojun 376: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 377: key_size(key), bits);
1.33 markus 378: break;
1.186 djm 379: #endif /* WITH_SSH1 */
1.33 markus 380: case 2:
1.87 markus 381: blob = buffer_get_string(&e->request, &blen);
1.39 markus 382: key = key_from_blob(blob, blen);
1.173 djm 383: free(blob);
1.33 markus 384: break;
385: }
386: if (key != NULL) {
1.78 provos 387: Identity *id = lookup_identity(key, version);
388: if (id != NULL) {
1.23 markus 389: /*
390: * We have this key. Free the old key. Since we
1.124 djm 391: * don't want to leave empty slots in the middle of
1.40 markus 392: * the array, we actually free the key there and move
393: * all the entries between the empty slot and the end
394: * of the array.
1.23 markus 395: */
1.33 markus 396: Idtab *tab = idtab_lookup(version);
1.38 markus 397: if (tab->nentries < 1)
398: fatal("process_remove_identity: "
399: "internal error: tab->nentries %d",
400: tab->nentries);
1.78 provos 401: TAILQ_REMOVE(&tab->idlist, id, next);
402: free_identity(id);
1.33 markus 403: tab->nentries--;
404: success = 1;
1.21 markus 405: }
1.33 markus 406: key_free(key);
407: }
1.1 deraadt 408: buffer_put_int(&e->output, 1);
1.33 markus 409: buffer_put_char(&e->output,
410: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 411: }
412:
1.55 itojun 413: static void
1.33 markus 414: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 415: {
1.33 markus 416: Idtab *tab = idtab_lookup(version);
1.78 provos 417: Identity *id;
1.21 markus 418:
419: /* Loop over all identities and clear the keys. */
1.78 provos 420: for (id = TAILQ_FIRST(&tab->idlist); id;
421: id = TAILQ_FIRST(&tab->idlist)) {
422: TAILQ_REMOVE(&tab->idlist, id, next);
423: free_identity(id);
1.21 markus 424: }
425:
426: /* Mark that there are no identities. */
1.33 markus 427: tab->nentries = 0;
1.21 markus 428:
429: /* Send success. */
430: buffer_put_int(&e->output, 1);
431: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 432: }
433:
1.155 dtucker 434: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 435: static time_t
1.89 markus 436: reaper(void)
437: {
1.175 dtucker 438: time_t deadline = 0, now = monotime();
1.89 markus 439: Identity *id, *nxt;
440: int version;
1.96 deraadt 441: Idtab *tab;
1.89 markus 442:
443: for (version = 1; version < 3; version++) {
444: tab = idtab_lookup(version);
445: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
446: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 447: if (id->death == 0)
448: continue;
449: if (now >= id->death) {
1.154 dtucker 450: debug("expiring key '%s'", id->comment);
1.89 markus 451: TAILQ_REMOVE(&tab->idlist, id, next);
452: free_identity(id);
453: tab->nentries--;
1.155 dtucker 454: } else
455: deadline = (deadline == 0) ? id->death :
456: MIN(deadline, id->death);
1.89 markus 457: }
458: }
1.155 dtucker 459: if (deadline == 0 || deadline <= now)
460: return 0;
461: else
462: return (deadline - now);
1.89 markus 463: }
464:
465: static void
1.33 markus 466: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 467: {
1.96 deraadt 468: Idtab *tab = idtab_lookup(version);
1.157 canacar 469: Identity *id;
1.174 dtucker 470: int type, success = 0, confirm = 0;
1.178 markus 471: char *comment;
1.174 dtucker 472: time_t death = 0;
1.33 markus 473: Key *k = NULL;
474:
475: switch (version) {
1.186 djm 476: #ifdef WITH_SSH1
1.33 markus 477: case 1:
1.39 markus 478: k = key_new_private(KEY_RSA1);
1.97 markus 479: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 480: buffer_get_bignum(&e->request, k->rsa->n);
481: buffer_get_bignum(&e->request, k->rsa->e);
482: buffer_get_bignum(&e->request, k->rsa->d);
483: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 484:
485: /* SSH and SSL have p and q swapped */
1.87 markus 486: buffer_get_bignum(&e->request, k->rsa->q); /* p */
487: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 488:
489: /* Generate additional parameters */
1.186 djm 490: if (rsa_generate_additional_parameters(k->rsa) != 0)
491: fatal("%s: rsa_generate_additional_parameters "
492: "error", __func__);
1.178 markus 493:
1.180 markus 494: /* enable blinding */
1.178 markus 495: if (RSA_blinding_on(k->rsa, NULL) != 1) {
496: error("process_add_identity: RSA_blinding_on failed");
497: key_free(k);
498: goto send;
499: }
1.33 markus 500: break;
1.186 djm 501: #endif /* WITH_SSH1 */
1.33 markus 502: case 2:
1.178 markus 503: k = key_private_deserialize(&e->request);
504: if (k == NULL) {
1.87 markus 505: buffer_clear(&e->request);
1.33 markus 506: goto send;
1.21 markus 507: }
1.33 markus 508: break;
509: }
1.186 djm 510: if (k == NULL)
511: goto send;
1.87 markus 512: comment = buffer_get_string(&e->request, NULL);
1.186 djm 513:
1.94 markus 514: while (buffer_len(&e->request)) {
1.158 djm 515: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 516: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 517: death = monotime() + buffer_get_int(&e->request);
1.94 markus 518: break;
1.107 markus 519: case SSH_AGENT_CONSTRAIN_CONFIRM:
520: confirm = 1;
521: break;
1.94 markus 522: default:
1.158 djm 523: error("process_add_identity: "
524: "Unknown constraint type %d", type);
1.173 djm 525: free(comment);
1.158 djm 526: key_free(k);
527: goto send;
1.94 markus 528: }
529: }
1.158 djm 530: success = 1;
1.106 marc 531: if (lifetime && !death)
1.175 dtucker 532: death = monotime() + lifetime;
1.157 canacar 533: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 534: id = xcalloc(1, sizeof(Identity));
1.78 provos 535: id->key = k;
536: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 537: /* Increment the number of identities. */
538: tab->nentries++;
539: } else {
540: key_free(k);
1.173 djm 541: free(id->comment);
1.33 markus 542: }
1.157 canacar 543: id->comment = comment;
544: id->death = death;
545: id->confirm = confirm;
1.33 markus 546: send:
1.1 deraadt 547: buffer_put_int(&e->output, 1);
1.33 markus 548: buffer_put_char(&e->output,
549: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 550: }
551:
1.88 markus 552: /* XXX todo: encrypt sensitive data with passphrase */
553: static void
554: process_lock_agent(SocketEntry *e, int lock)
555: {
1.96 deraadt 556: int success = 0;
1.88 markus 557: char *passwd;
558:
559: passwd = buffer_get_string(&e->request, NULL);
560: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
561: locked = 0;
1.183 djm 562: explicit_bzero(lock_passwd, strlen(lock_passwd));
1.173 djm 563: free(lock_passwd);
1.88 markus 564: lock_passwd = NULL;
565: success = 1;
566: } else if (!locked && lock) {
567: locked = 1;
568: lock_passwd = xstrdup(passwd);
569: success = 1;
570: }
1.183 djm 571: explicit_bzero(passwd, strlen(passwd));
1.173 djm 572: free(passwd);
1.95 deraadt 573:
1.88 markus 574: buffer_put_int(&e->output, 1);
575: buffer_put_char(&e->output,
576: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
577: }
578:
579: static void
580: no_identities(SocketEntry *e, u_int type)
581: {
582: Buffer msg;
583:
584: buffer_init(&msg);
585: buffer_put_char(&msg,
586: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
587: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
588: buffer_put_int(&msg, 0);
589: buffer_put_int(&e->output, buffer_len(&msg));
590: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
591: buffer_free(&msg);
592: }
1.59 markus 593:
1.163 markus 594: #ifdef ENABLE_PKCS11
1.59 markus 595: static void
1.158 djm 596: process_add_smartcard_key(SocketEntry *e)
1.59 markus 597: {
1.163 markus 598: char *provider = NULL, *pin;
1.174 dtucker 599: int i, type, version, count = 0, success = 0, confirm = 0;
600: time_t death = 0;
1.163 markus 601: Key **keys = NULL, *k;
1.84 markus 602: Identity *id;
1.59 markus 603: Idtab *tab;
1.75 deraadt 604:
1.163 markus 605: provider = buffer_get_string(&e->request, NULL);
1.87 markus 606: pin = buffer_get_string(&e->request, NULL);
1.110 djm 607:
608: while (buffer_len(&e->request)) {
1.158 djm 609: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 610: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 611: death = monotime() + buffer_get_int(&e->request);
1.110 djm 612: break;
613: case SSH_AGENT_CONSTRAIN_CONFIRM:
614: confirm = 1;
615: break;
616: default:
1.158 djm 617: error("process_add_smartcard_key: "
618: "Unknown constraint type %d", type);
619: goto send;
1.110 djm 620: }
621: }
622: if (lifetime && !death)
1.175 dtucker 623: death = monotime() + lifetime;
1.110 djm 624:
1.163 markus 625: count = pkcs11_add_provider(provider, pin, &keys);
626: for (i = 0; i < count; i++) {
1.84 markus 627: k = keys[i];
628: version = k->type == KEY_RSA1 ? 1 : 2;
629: tab = idtab_lookup(version);
630: if (lookup_identity(k, version) == NULL) {
1.163 markus 631: id = xcalloc(1, sizeof(Identity));
1.84 markus 632: id->key = k;
1.163 markus 633: id->provider = xstrdup(provider);
634: id->comment = xstrdup(provider); /* XXX */
1.110 djm 635: id->death = death;
636: id->confirm = confirm;
1.84 markus 637: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
638: tab->nentries++;
639: success = 1;
640: } else {
641: key_free(k);
642: }
643: keys[i] = NULL;
1.59 markus 644: }
645: send:
1.173 djm 646: free(pin);
647: free(provider);
648: free(keys);
1.59 markus 649: buffer_put_int(&e->output, 1);
650: buffer_put_char(&e->output,
651: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
652: }
653:
654: static void
655: process_remove_smartcard_key(SocketEntry *e)
656: {
1.163 markus 657: char *provider = NULL, *pin = NULL;
658: int version, success = 0;
659: Identity *id, *nxt;
1.84 markus 660: Idtab *tab;
1.59 markus 661:
1.163 markus 662: provider = buffer_get_string(&e->request, NULL);
1.87 markus 663: pin = buffer_get_string(&e->request, NULL);
1.173 djm 664: free(pin);
1.59 markus 665:
1.163 markus 666: for (version = 1; version < 3; version++) {
667: tab = idtab_lookup(version);
668: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
669: nxt = TAILQ_NEXT(id, next);
1.181 djm 670: /* Skip file--based keys */
671: if (id->provider == NULL)
672: continue;
1.163 markus 673: if (!strcmp(provider, id->provider)) {
674: TAILQ_REMOVE(&tab->idlist, id, next);
675: free_identity(id);
676: tab->nentries--;
677: }
1.59 markus 678: }
679: }
1.163 markus 680: if (pkcs11_del_provider(provider) == 0)
681: success = 1;
682: else
683: error("process_remove_smartcard_key:"
684: " pkcs11_del_provider failed");
1.173 djm 685: free(provider);
1.59 markus 686: buffer_put_int(&e->output, 1);
687: buffer_put_char(&e->output,
688: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
689: }
1.163 markus 690: #endif /* ENABLE_PKCS11 */
1.59 markus 691:
1.33 markus 692: /* dispatch incoming messages */
693:
1.55 itojun 694: static void
1.2 provos 695: process_message(SocketEntry *e)
1.1 deraadt 696: {
1.96 deraadt 697: u_int msg_len, type;
1.45 markus 698: u_char *cp;
1.89 markus 699:
1.21 markus 700: if (buffer_len(&e->input) < 5)
701: return; /* Incomplete message. */
1.77 stevesk 702: cp = buffer_ptr(&e->input);
1.137 djm 703: msg_len = get_u32(cp);
1.21 markus 704: if (msg_len > 256 * 1024) {
1.101 stevesk 705: close_socket(e);
1.21 markus 706: return;
707: }
708: if (buffer_len(&e->input) < msg_len + 4)
709: return;
1.87 markus 710:
711: /* move the current input to e->request */
1.21 markus 712: buffer_consume(&e->input, 4);
1.87 markus 713: buffer_clear(&e->request);
714: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
715: buffer_consume(&e->input, msg_len);
716: type = buffer_get_char(&e->request);
1.21 markus 717:
1.88 markus 718: /* check wheter agent is locked */
719: if (locked && type != SSH_AGENTC_UNLOCK) {
720: buffer_clear(&e->request);
721: switch (type) {
722: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
723: case SSH2_AGENTC_REQUEST_IDENTITIES:
724: /* send empty lists */
725: no_identities(e, type);
726: break;
727: default:
728: /* send a fail message for all other request types */
729: buffer_put_int(&e->output, 1);
730: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
731: }
732: return;
733: }
734:
1.59 markus 735: debug("type %d", type);
1.21 markus 736: switch (type) {
1.88 markus 737: case SSH_AGENTC_LOCK:
738: case SSH_AGENTC_UNLOCK:
739: process_lock_agent(e, type == SSH_AGENTC_LOCK);
740: break;
1.185 markus 741: #ifdef WITH_SSH1
1.33 markus 742: /* ssh1 */
743: case SSH_AGENTC_RSA_CHALLENGE:
744: process_authentication_challenge1(e);
745: break;
1.21 markus 746: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 747: process_request_identities(e, 1);
1.21 markus 748: break;
749: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 750: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 751: process_add_identity(e, 1);
1.21 markus 752: break;
753: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 754: process_remove_identity(e, 1);
1.21 markus 755: break;
756: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 757: process_remove_all_identities(e, 1);
758: break;
1.185 markus 759: #endif
1.33 markus 760: /* ssh2 */
761: case SSH2_AGENTC_SIGN_REQUEST:
762: process_sign_request2(e);
763: break;
764: case SSH2_AGENTC_REQUEST_IDENTITIES:
765: process_request_identities(e, 2);
766: break;
767: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 768: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 769: process_add_identity(e, 2);
770: break;
771: case SSH2_AGENTC_REMOVE_IDENTITY:
772: process_remove_identity(e, 2);
773: break;
774: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
775: process_remove_all_identities(e, 2);
1.21 markus 776: break;
1.163 markus 777: #ifdef ENABLE_PKCS11
1.59 markus 778: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 779: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 780: process_add_smartcard_key(e);
1.75 deraadt 781: break;
1.59 markus 782: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
783: process_remove_smartcard_key(e);
1.75 deraadt 784: break;
1.163 markus 785: #endif /* ENABLE_PKCS11 */
1.21 markus 786: default:
787: /* Unknown message. Respond with failure. */
788: error("Unknown message %d", type);
1.87 markus 789: buffer_clear(&e->request);
1.21 markus 790: buffer_put_int(&e->output, 1);
791: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
792: break;
793: }
1.1 deraadt 794: }
795:
1.55 itojun 796: static void
1.73 stevesk 797: new_socket(sock_type type, int fd)
1.1 deraadt 798: {
1.112 markus 799: u_int i, old_alloc, new_alloc;
1.96 deraadt 800:
1.119 djm 801: set_nonblock(fd);
1.21 markus 802:
803: if (fd > max_fd)
804: max_fd = fd;
805:
806: for (i = 0; i < sockets_alloc; i++)
807: if (sockets[i].type == AUTH_UNUSED) {
808: sockets[i].fd = fd;
809: buffer_init(&sockets[i].input);
810: buffer_init(&sockets[i].output);
1.87 markus 811: buffer_init(&sockets[i].request);
1.112 markus 812: sockets[i].type = type;
1.21 markus 813: return;
814: }
815: old_alloc = sockets_alloc;
1.112 markus 816: new_alloc = sockets_alloc + 10;
1.133 djm 817: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 818: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 819: sockets[i].type = AUTH_UNUSED;
1.112 markus 820: sockets_alloc = new_alloc;
1.21 markus 821: sockets[old_alloc].fd = fd;
822: buffer_init(&sockets[old_alloc].input);
823: buffer_init(&sockets[old_alloc].output);
1.87 markus 824: buffer_init(&sockets[old_alloc].request);
1.112 markus 825: sockets[old_alloc].type = type;
1.1 deraadt 826: }
827:
1.55 itojun 828: static int
1.155 dtucker 829: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
830: struct timeval **tvpp)
1.1 deraadt 831: {
1.174 dtucker 832: u_int i, sz;
1.46 markus 833: int n = 0;
1.155 dtucker 834: static struct timeval tv;
1.174 dtucker 835: time_t deadline;
1.46 markus 836:
837: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 838: switch (sockets[i].type) {
839: case AUTH_SOCKET:
840: case AUTH_CONNECTION:
1.46 markus 841: n = MAX(n, sockets[i].fd);
1.21 markus 842: break;
843: case AUTH_UNUSED:
844: break;
845: default:
846: fatal("Unknown socket type %d", sockets[i].type);
847: break;
848: }
1.46 markus 849: }
850:
851: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 852: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 853: free(*fdrp);
854: free(*fdwp);
1.46 markus 855: *fdrp = xmalloc(sz);
856: *fdwp = xmalloc(sz);
1.66 markus 857: *nallocp = sz;
1.46 markus 858: }
1.66 markus 859: if (n < *fdl)
860: debug("XXX shrink: %d < %d", n, *fdl);
861: *fdl = n;
1.46 markus 862: memset(*fdrp, 0, sz);
863: memset(*fdwp, 0, sz);
864:
865: for (i = 0; i < sockets_alloc; i++) {
866: switch (sockets[i].type) {
867: case AUTH_SOCKET:
868: case AUTH_CONNECTION:
869: FD_SET(sockets[i].fd, *fdrp);
870: if (buffer_len(&sockets[i].output) > 0)
871: FD_SET(sockets[i].fd, *fdwp);
872: break;
873: default:
874: break;
875: }
876: }
1.155 dtucker 877: deadline = reaper();
878: if (parent_alive_interval != 0)
879: deadline = (deadline == 0) ? parent_alive_interval :
880: MIN(deadline, parent_alive_interval);
881: if (deadline == 0) {
882: *tvpp = NULL;
883: } else {
884: tv.tv_sec = deadline;
885: tv.tv_usec = 0;
886: *tvpp = &tv;
887: }
1.46 markus 888: return (1);
1.21 markus 889: }
890:
1.55 itojun 891: static void
1.21 markus 892: after_select(fd_set *readset, fd_set *writeset)
893: {
1.96 deraadt 894: struct sockaddr_un sunaddr;
1.26 markus 895: socklen_t slen;
1.21 markus 896: char buf[1024];
1.96 deraadt 897: int len, sock;
1.162 djm 898: u_int i, orig_alloc;
1.103 markus 899: uid_t euid;
900: gid_t egid;
1.21 markus 901:
1.162 djm 902: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 903: switch (sockets[i].type) {
904: case AUTH_UNUSED:
905: break;
906: case AUTH_SOCKET:
907: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 908: slen = sizeof(sunaddr);
1.46 markus 909: sock = accept(sockets[i].fd,
1.131 deraadt 910: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 911: if (sock < 0) {
1.81 stevesk 912: error("accept from AUTH_SOCKET: %s",
913: strerror(errno));
1.103 markus 914: break;
915: }
916: if (getpeereid(sock, &euid, &egid) < 0) {
917: error("getpeereid %d failed: %s",
918: sock, strerror(errno));
919: close(sock);
920: break;
921: }
1.105 markus 922: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 923: error("uid mismatch: "
1.104 stevesk 924: "peer euid %u != uid %u",
925: (u_int) euid, (u_int) getuid());
1.103 markus 926: close(sock);
1.21 markus 927: break;
928: }
929: new_socket(AUTH_CONNECTION, sock);
930: }
931: break;
932: case AUTH_CONNECTION:
933: if (buffer_len(&sockets[i].output) > 0 &&
934: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 935: len = write(sockets[i].fd,
936: buffer_ptr(&sockets[i].output),
937: buffer_len(&sockets[i].output));
938: if (len == -1 && (errno == EAGAIN ||
939: errno == EINTR))
940: continue;
1.21 markus 941: if (len <= 0) {
1.101 stevesk 942: close_socket(&sockets[i]);
1.21 markus 943: break;
944: }
945: buffer_consume(&sockets[i].output, len);
946: }
947: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 948: len = read(sockets[i].fd, buf, sizeof(buf));
949: if (len == -1 && (errno == EAGAIN ||
950: errno == EINTR))
951: continue;
1.21 markus 952: if (len <= 0) {
1.101 stevesk 953: close_socket(&sockets[i]);
1.21 markus 954: break;
955: }
956: buffer_append(&sockets[i].input, buf, len);
1.190 dtucker 957: explicit_bzero(buf, sizeof(buf));
1.21 markus 958: process_message(&sockets[i]);
959: }
960: break;
961: default:
962: fatal("Unknown type %d", sockets[i].type);
963: }
1.1 deraadt 964: }
965:
1.55 itojun 966: static void
1.113 markus 967: cleanup_socket(void)
1.15 markus 968: {
1.187 djm 969: if (cleanup_pid != 0 && getpid() != cleanup_pid)
970: return;
971: debug("%s: cleanup", __func__);
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();
1.163 markus 990: #ifdef ENABLE_PKCS11
991: pkcs11_terminate();
992: #endif
1.48 deraadt 993: _exit(2);
1.113 markus 994: }
995:
1.68 markus 996: static void
1.155 dtucker 997: check_parent_exists(void)
1.68 markus 998: {
1.172 dtucker 999: /*
1000: * If our parent has exited then getppid() will return (pid_t)1,
1001: * so testing for that should be safe.
1002: */
1003: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1004: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1005: cleanup_socket();
1006: _exit(2);
1.68 markus 1007: }
1.48 deraadt 1008: }
1009:
1.55 itojun 1010: static void
1.50 itojun 1011: usage(void)
1.15 markus 1012: {
1.184 deraadt 1013: fprintf(stderr,
1.193 ! jmc 1014: "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-E fingerprint_hash]\n"
! 1015: " [-t life] [command [arg ...]]\n"
1.184 deraadt 1016: " ssh-agent [-c | -s] -k\n");
1.21 markus 1017: exit(1);
1.15 markus 1018: }
1019:
1.2 provos 1020: int
1021: main(int ac, char **av)
1.1 deraadt 1022: {
1.107 markus 1023: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1024: int sock, fd, ch, result, saved_errno;
1.120 avsm 1025: u_int nalloc;
1.96 deraadt 1026: char *shell, *format, *pidstr, *agentsocket = NULL;
1027: fd_set *readsetp = NULL, *writesetp = NULL;
1.41 markus 1028: struct rlimit rlim;
1.96 deraadt 1029: extern int optind;
1.98 stevesk 1030: extern char *optarg;
1.21 markus 1031: pid_t pid;
1.96 deraadt 1032: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1033: struct timeval *tvp = NULL;
1.161 tobias 1034: size_t len;
1.189 djm 1035: mode_t prev_mask;
1.123 djm 1036:
1037: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1038: sanitise_stdfd();
1.99 markus 1039:
1040: /* drop */
1041: setegid(getgid());
1042: setgid(getgid());
1.53 markus 1043:
1.185 markus 1044: #ifdef WITH_OPENSSL
1.170 djm 1045: OpenSSL_add_all_algorithms();
1.185 markus 1046: #endif
1.21 markus 1047:
1.192 djm 1048: while ((ch = getopt(ac, av, "cdksE:a:t:")) != -1) {
1.21 markus 1049: switch (ch) {
1.192 djm 1050: case 'E':
1051: fingerprint_hash = ssh_digest_alg_by_name(optarg);
1052: if (fingerprint_hash == -1)
1053: fatal("Invalid hash algorithm \"%s\"", optarg);
1054: break;
1.21 markus 1055: case 'c':
1056: if (s_flag)
1057: usage();
1058: c_flag++;
1059: break;
1060: case 'k':
1061: k_flag++;
1062: break;
1063: case 's':
1064: if (c_flag)
1065: usage();
1066: s_flag++;
1067: break;
1.57 markus 1068: case 'd':
1069: if (d_flag)
1070: usage();
1071: d_flag++;
1072: break;
1.86 markus 1073: case 'a':
1074: agentsocket = optarg;
1.106 marc 1075: break;
1076: case 't':
1077: if ((lifetime = convtime(optarg)) == -1) {
1078: fprintf(stderr, "Invalid lifetime\n");
1079: usage();
1080: }
1.86 markus 1081: break;
1.21 markus 1082: default:
1083: usage();
1084: }
1085: }
1086: ac -= optind;
1087: av += optind;
1088:
1.57 markus 1089: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1090: usage();
1091:
1.85 markus 1092: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1093: shell = getenv("SHELL");
1.161 tobias 1094: if (shell != NULL && (len = strlen(shell)) > 2 &&
1095: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1096: c_flag = 1;
1097: }
1098: if (k_flag) {
1.136 deraadt 1099: const char *errstr = NULL;
1100:
1.21 markus 1101: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1102: if (pidstr == NULL) {
1103: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1104: SSH_AGENTPID_ENV_NAME);
1.21 markus 1105: exit(1);
1106: }
1.136 deraadt 1107: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1108: if (errstr) {
1109: fprintf(stderr,
1110: "%s=\"%s\", which is not a good PID: %s\n",
1111: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1112: exit(1);
1113: }
1114: if (kill(pid, SIGTERM) == -1) {
1115: perror("kill");
1116: exit(1);
1117: }
1118: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1119: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1120: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1121: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1122: exit(0);
1123: }
1124: parent_pid = getpid();
1125:
1.86 markus 1126: if (agentsocket == NULL) {
1127: /* Create private directory for agent socket */
1.171 djm 1128: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1129: if (mkdtemp(socket_dir) == NULL) {
1130: perror("mkdtemp: private socket dir");
1131: exit(1);
1132: }
1.91 mpech 1133: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1134: (long)parent_pid);
1.86 markus 1135: } else {
1136: /* Try to use specified agent socket */
1137: socket_dir[0] = '\0';
1138: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1139: }
1140:
1.23 markus 1141: /*
1142: * Create socket early so it will exist before command gets run from
1143: * the parent.
1144: */
1.189 djm 1145: prev_mask = umask(0177);
1.188 millert 1146: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 1147: if (sock < 0) {
1.188 millert 1148: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 1149: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1150: cleanup_exit(1);
1151: }
1.189 djm 1152: umask(prev_mask);
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:
1.187 djm 1218:
1219: cleanup_pid = getpid();
1.163 markus 1220:
1221: #ifdef ENABLE_PKCS11
1222: pkcs11_init(0);
1223: #endif
1.21 markus 1224: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1225: if (ac > 0)
1226: parent_alive_interval = 10;
1.33 markus 1227: idtab_init();
1.61 markus 1228: signal(SIGPIPE, SIG_IGN);
1.177 djm 1229: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1230: signal(SIGHUP, cleanup_handler);
1231: signal(SIGTERM, cleanup_handler);
1.66 markus 1232: nalloc = 0;
1233:
1.21 markus 1234: while (1) {
1.155 dtucker 1235: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1236: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1237: saved_errno = errno;
1.155 dtucker 1238: if (parent_alive_interval != 0)
1239: check_parent_exists();
1240: (void) reaper(); /* remove expired keys */
1.154 dtucker 1241: if (result < 0) {
1242: if (saved_errno == EINTR)
1.21 markus 1243: continue;
1.154 dtucker 1244: fatal("select: %s", strerror(saved_errno));
1245: } else if (result > 0)
1246: after_select(readsetp, writesetp);
1.15 markus 1247: }
1.21 markus 1248: /* NOTREACHED */
1.1 deraadt 1249: }
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