Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.190
1.190 ! dtucker 1: /* $OpenBSD: ssh-agent.c,v 1.189 2014/07/18 02:46:01 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>
1.128 stevesk 41: #include <sys/types.h>
1.141 stevesk 42: #include <sys/socket.h>
1.189 djm 43: #include <sys/stat.h>
1.128 stevesk 44: #include <sys/un.h>
1.148 stevesk 45: #include <sys/param.h>
1.126 stevesk 46:
1.185 markus 47: #ifdef WITH_OPENSSL
1.146 stevesk 48: #include <openssl/evp.h>
1.185 markus 49: #endif
1.146 stevesk 50:
1.143 stevesk 51: #include <errno.h>
1.142 stevesk 52: #include <fcntl.h>
1.126 stevesk 53: #include <paths.h>
1.129 stevesk 54: #include <signal.h>
1.149 stevesk 55: #include <stdlib.h>
1.150 stevesk 56: #include <stdio.h>
1.146 stevesk 57: #include <string.h>
1.145 stevesk 58: #include <time.h>
1.144 stevesk 59: #include <unistd.h>
1.1 deraadt 60:
1.151 deraadt 61: #include "xmalloc.h"
1.1 deraadt 62: #include "ssh.h"
63: #include "rsa.h"
64: #include "buffer.h"
1.32 markus 65: #include "key.h"
66: #include "authfd.h"
1.37 markus 67: #include "compat.h"
1.47 markus 68: #include "log.h"
1.107 markus 69: #include "misc.h"
1.182 markus 70: #include "digest.h"
1.7 deraadt 71:
1.163 markus 72: #ifdef ENABLE_PKCS11
73: #include "ssh-pkcs11.h"
1.71 jakob 74: #endif
1.59 markus 75:
1.73 stevesk 76: typedef enum {
77: AUTH_UNUSED,
78: AUTH_SOCKET,
79: AUTH_CONNECTION
80: } sock_type;
81:
1.21 markus 82: typedef struct {
83: int fd;
1.73 stevesk 84: sock_type type;
1.21 markus 85: Buffer input;
86: Buffer output;
1.87 markus 87: Buffer request;
1.1 deraadt 88: } SocketEntry;
89:
1.45 markus 90: u_int sockets_alloc = 0;
1.1 deraadt 91: SocketEntry *sockets = NULL;
92:
1.78 provos 93: typedef struct identity {
94: TAILQ_ENTRY(identity) next;
1.33 markus 95: Key *key;
1.21 markus 96: char *comment;
1.163 markus 97: char *provider;
1.174 dtucker 98: time_t death;
1.107 markus 99: u_int confirm;
1.1 deraadt 100: } Identity;
101:
1.33 markus 102: typedef struct {
103: int nentries;
1.78 provos 104: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 105: } Idtab;
106:
107: /* private key table, one per protocol version */
108: Idtab idtable[3];
1.1 deraadt 109:
110: int max_fd = 0;
111:
1.11 markus 112: /* pid of shell == parent of agent */
1.29 deraadt 113: pid_t parent_pid = -1;
1.176 dtucker 114: time_t parent_alive_interval = 0;
1.10 markus 115:
1.187 djm 116: /* pid of process for which cleanup_socket is applicable */
117: pid_t cleanup_pid = 0;
118:
1.10 markus 119: /* pathname and directory for AUTH_SOCKET */
1.132 djm 120: char socket_name[MAXPATHLEN];
121: char socket_dir[MAXPATHLEN];
1.10 markus 122:
1.88 markus 123: /* locking */
124: int locked = 0;
125: char *lock_passwd = NULL;
126:
1.20 markus 127: extern char *__progname;
128:
1.174 dtucker 129: /* Default lifetime in seconds (0 == forever) */
130: static long lifetime = 0;
1.106 marc 131:
1.55 itojun 132: static void
1.101 stevesk 133: close_socket(SocketEntry *e)
134: {
135: close(e->fd);
136: e->fd = -1;
137: e->type = AUTH_UNUSED;
138: buffer_free(&e->input);
139: buffer_free(&e->output);
140: buffer_free(&e->request);
141: }
142:
143: static void
1.33 markus 144: idtab_init(void)
1.1 deraadt 145: {
1.33 markus 146: int i;
1.96 deraadt 147:
1.74 deraadt 148: for (i = 0; i <=2; i++) {
1.78 provos 149: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 150: idtable[i].nentries = 0;
151: }
152: }
153:
154: /* return private key table for requested protocol version */
1.55 itojun 155: static Idtab *
1.33 markus 156: idtab_lookup(int version)
157: {
158: if (version < 1 || version > 2)
159: fatal("internal error, bad protocol version %d", version);
160: return &idtable[version];
161: }
162:
1.89 markus 163: static void
164: free_identity(Identity *id)
165: {
166: key_free(id->key);
1.173 djm 167: free(id->provider);
168: free(id->comment);
169: free(id);
1.89 markus 170: }
171:
1.33 markus 172: /* return matching private key for given public key */
1.78 provos 173: static Identity *
174: lookup_identity(Key *key, int version)
1.33 markus 175: {
1.78 provos 176: Identity *id;
177:
1.33 markus 178: Idtab *tab = idtab_lookup(version);
1.78 provos 179: TAILQ_FOREACH(id, &tab->idlist, next) {
180: if (key_equal(key, id->key))
181: return (id);
1.33 markus 182: }
1.78 provos 183: return (NULL);
184: }
185:
1.107 markus 186: /* Check confirmation of keysign request */
187: static int
188: confirm_key(Identity *id)
189: {
1.122 djm 190: char *p;
1.107 markus 191: int ret = -1;
192:
193: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 194: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
195: id->comment, p))
196: ret = 0;
1.173 djm 197: free(p);
1.122 djm 198:
1.107 markus 199: return (ret);
200: }
201:
1.33 markus 202: /* send list of supported public keys to 'client' */
1.55 itojun 203: static void
1.33 markus 204: process_request_identities(SocketEntry *e, int version)
205: {
206: Idtab *tab = idtab_lookup(version);
1.96 deraadt 207: Identity *id;
1.21 markus 208: Buffer msg;
1.1 deraadt 209:
1.21 markus 210: buffer_init(&msg);
1.33 markus 211: buffer_put_char(&msg, (version == 1) ?
212: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
213: buffer_put_int(&msg, tab->nentries);
1.78 provos 214: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 215: if (id->key->type == KEY_RSA1) {
1.185 markus 216: #ifdef WITH_SSH1
1.33 markus 217: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
218: buffer_put_bignum(&msg, id->key->rsa->e);
219: buffer_put_bignum(&msg, id->key->rsa->n);
1.185 markus 220: #endif
1.33 markus 221: } else {
1.45 markus 222: u_char *blob;
223: u_int blen;
1.39 markus 224: key_to_blob(id->key, &blob, &blen);
1.33 markus 225: buffer_put_string(&msg, blob, blen);
1.173 djm 226: free(blob);
1.33 markus 227: }
228: buffer_put_cstring(&msg, id->comment);
1.21 markus 229: }
230: buffer_put_int(&e->output, buffer_len(&msg));
231: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
232: buffer_free(&msg);
1.1 deraadt 233: }
234:
1.185 markus 235: #ifdef WITH_SSH1
1.33 markus 236: /* ssh1 only */
1.55 itojun 237: static void
1.33 markus 238: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 239: {
1.96 deraadt 240: u_char buf[32], mdbuf[16], session_id[16];
241: u_int response_type;
242: BIGNUM *challenge;
1.78 provos 243: Identity *id;
1.33 markus 244: int i, len;
1.21 markus 245: Buffer msg;
1.182 markus 246: struct ssh_digest_ctx *md;
1.96 deraadt 247: Key *key;
1.21 markus 248:
249: buffer_init(&msg);
1.39 markus 250: key = key_new(KEY_RSA1);
1.76 markus 251: if ((challenge = BN_new()) == NULL)
252: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 253:
1.97 markus 254: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 255: buffer_get_bignum(&e->request, key->rsa->e);
256: buffer_get_bignum(&e->request, key->rsa->n);
257: buffer_get_bignum(&e->request, challenge);
1.21 markus 258:
1.33 markus 259: /* Only protocol 1.1 is supported */
1.87 markus 260: if (buffer_len(&e->request) == 0)
1.33 markus 261: goto failure;
1.87 markus 262: buffer_get(&e->request, session_id, 16);
263: response_type = buffer_get_int(&e->request);
1.33 markus 264: if (response_type != 1)
265: goto failure;
266:
1.78 provos 267: id = lookup_identity(key, 1);
1.107 markus 268: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 269: Key *private = id->key;
1.33 markus 270: /* Decrypt the challenge using the private key. */
1.186 djm 271: if (rsa_private_decrypt(challenge, challenge, private->rsa) != 0)
1.49 markus 272: goto failure;
1.33 markus 273:
274: /* The response is MD5 of decrypted challenge plus session id. */
275: len = BN_num_bytes(challenge);
276: if (len <= 0 || len > 32) {
1.109 itojun 277: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 278: goto failure;
279: }
280: memset(buf, 0, 32);
281: BN_bn2bin(challenge, buf + 32 - len);
1.182 markus 282: if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
283: ssh_digest_update(md, buf, 32) < 0 ||
284: ssh_digest_update(md, session_id, 16) < 0 ||
285: ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
286: fatal("%s: md5 failed", __func__);
287: ssh_digest_free(md);
1.33 markus 288:
289: /* Send the response. */
290: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
291: for (i = 0; i < 16; i++)
292: buffer_put_char(&msg, mdbuf[i]);
293: goto send;
294: }
1.21 markus 295:
1.33 markus 296: failure:
297: /* Unknown identity or protocol error. Send failure. */
1.21 markus 298: buffer_put_char(&msg, SSH_AGENT_FAILURE);
299: send:
300: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 301: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
302: key_free(key);
303: BN_clear_free(challenge);
304: buffer_free(&msg);
305: }
1.185 markus 306: #endif
1.33 markus 307:
308: /* ssh2 only */
1.55 itojun 309: static void
1.33 markus 310: process_sign_request2(SocketEntry *e)
311: {
1.45 markus 312: u_char *blob, *data, *signature = NULL;
313: u_int blen, dlen, slen = 0;
1.96 deraadt 314: extern int datafellows;
1.159 djm 315: int odatafellows;
1.96 deraadt 316: int ok = -1, flags;
1.33 markus 317: Buffer msg;
1.96 deraadt 318: Key *key;
1.33 markus 319:
320: datafellows = 0;
1.43 markus 321:
1.87 markus 322: blob = buffer_get_string(&e->request, &blen);
323: data = buffer_get_string(&e->request, &dlen);
1.37 markus 324:
1.87 markus 325: flags = buffer_get_int(&e->request);
1.159 djm 326: odatafellows = datafellows;
1.37 markus 327: if (flags & SSH_AGENT_OLD_SIGNATURE)
328: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 329:
1.39 markus 330: key = key_from_blob(blob, blen);
1.33 markus 331: if (key != NULL) {
1.78 provos 332: Identity *id = lookup_identity(key, 2);
1.107 markus 333: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 334: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 335: key_free(key);
1.33 markus 336: }
337: buffer_init(&msg);
338: if (ok == 0) {
339: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
340: buffer_put_string(&msg, signature, slen);
341: } else {
342: buffer_put_char(&msg, SSH_AGENT_FAILURE);
343: }
344: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 345: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 346: buffer_len(&msg));
1.21 markus 347: buffer_free(&msg);
1.173 djm 348: free(data);
349: free(blob);
350: free(signature);
1.159 djm 351: datafellows = odatafellows;
1.1 deraadt 352: }
353:
1.33 markus 354: /* shared */
1.55 itojun 355: static void
1.33 markus 356: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 357: {
1.186 djm 358: u_int blen;
1.96 deraadt 359: int success = 0;
1.78 provos 360: Key *key = NULL;
1.45 markus 361: u_char *blob;
1.186 djm 362: #ifdef WITH_SSH1
363: u_int bits;
364: #endif /* WITH_SSH1 */
1.21 markus 365:
1.74 deraadt 366: switch (version) {
1.186 djm 367: #ifdef WITH_SSH1
1.33 markus 368: case 1:
1.39 markus 369: key = key_new(KEY_RSA1);
1.87 markus 370: bits = buffer_get_int(&e->request);
371: buffer_get_bignum(&e->request, key->rsa->e);
372: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 373:
374: if (bits != key_size(key))
1.109 itojun 375: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 376: key_size(key), bits);
1.33 markus 377: break;
1.186 djm 378: #endif /* WITH_SSH1 */
1.33 markus 379: case 2:
1.87 markus 380: blob = buffer_get_string(&e->request, &blen);
1.39 markus 381: key = key_from_blob(blob, blen);
1.173 djm 382: free(blob);
1.33 markus 383: break;
384: }
385: if (key != NULL) {
1.78 provos 386: Identity *id = lookup_identity(key, version);
387: if (id != NULL) {
1.23 markus 388: /*
389: * We have this key. Free the old key. Since we
1.124 djm 390: * don't want to leave empty slots in the middle of
1.40 markus 391: * the array, we actually free the key there and move
392: * all the entries between the empty slot and the end
393: * of the array.
1.23 markus 394: */
1.33 markus 395: Idtab *tab = idtab_lookup(version);
1.38 markus 396: if (tab->nentries < 1)
397: fatal("process_remove_identity: "
398: "internal error: tab->nentries %d",
399: tab->nentries);
1.78 provos 400: TAILQ_REMOVE(&tab->idlist, id, next);
401: free_identity(id);
1.33 markus 402: tab->nentries--;
403: success = 1;
1.21 markus 404: }
1.33 markus 405: key_free(key);
406: }
1.1 deraadt 407: buffer_put_int(&e->output, 1);
1.33 markus 408: buffer_put_char(&e->output,
409: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 410: }
411:
1.55 itojun 412: static void
1.33 markus 413: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 414: {
1.33 markus 415: Idtab *tab = idtab_lookup(version);
1.78 provos 416: Identity *id;
1.21 markus 417:
418: /* Loop over all identities and clear the keys. */
1.78 provos 419: for (id = TAILQ_FIRST(&tab->idlist); id;
420: id = TAILQ_FIRST(&tab->idlist)) {
421: TAILQ_REMOVE(&tab->idlist, id, next);
422: free_identity(id);
1.21 markus 423: }
424:
425: /* Mark that there are no identities. */
1.33 markus 426: tab->nentries = 0;
1.21 markus 427:
428: /* Send success. */
429: buffer_put_int(&e->output, 1);
430: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 431: }
432:
1.155 dtucker 433: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 434: static time_t
1.89 markus 435: reaper(void)
436: {
1.175 dtucker 437: time_t deadline = 0, now = monotime();
1.89 markus 438: Identity *id, *nxt;
439: int version;
1.96 deraadt 440: Idtab *tab;
1.89 markus 441:
442: for (version = 1; version < 3; version++) {
443: tab = idtab_lookup(version);
444: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
445: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 446: if (id->death == 0)
447: continue;
448: if (now >= id->death) {
1.154 dtucker 449: debug("expiring key '%s'", id->comment);
1.89 markus 450: TAILQ_REMOVE(&tab->idlist, id, next);
451: free_identity(id);
452: tab->nentries--;
1.155 dtucker 453: } else
454: deadline = (deadline == 0) ? id->death :
455: MIN(deadline, id->death);
1.89 markus 456: }
457: }
1.155 dtucker 458: if (deadline == 0 || deadline <= now)
459: return 0;
460: else
461: return (deadline - now);
1.89 markus 462: }
463:
464: static void
1.33 markus 465: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 466: {
1.96 deraadt 467: Idtab *tab = idtab_lookup(version);
1.157 canacar 468: Identity *id;
1.174 dtucker 469: int type, success = 0, confirm = 0;
1.178 markus 470: char *comment;
1.174 dtucker 471: time_t death = 0;
1.33 markus 472: Key *k = NULL;
473:
474: switch (version) {
1.186 djm 475: #ifdef WITH_SSH1
1.33 markus 476: case 1:
1.39 markus 477: k = key_new_private(KEY_RSA1);
1.97 markus 478: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 479: buffer_get_bignum(&e->request, k->rsa->n);
480: buffer_get_bignum(&e->request, k->rsa->e);
481: buffer_get_bignum(&e->request, k->rsa->d);
482: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 483:
484: /* SSH and SSL have p and q swapped */
1.87 markus 485: buffer_get_bignum(&e->request, k->rsa->q); /* p */
486: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 487:
488: /* Generate additional parameters */
1.186 djm 489: if (rsa_generate_additional_parameters(k->rsa) != 0)
490: fatal("%s: rsa_generate_additional_parameters "
491: "error", __func__);
1.178 markus 492:
1.180 markus 493: /* enable blinding */
1.178 markus 494: if (RSA_blinding_on(k->rsa, NULL) != 1) {
495: error("process_add_identity: RSA_blinding_on failed");
496: key_free(k);
497: goto send;
498: }
1.33 markus 499: break;
1.186 djm 500: #endif /* WITH_SSH1 */
1.33 markus 501: case 2:
1.178 markus 502: k = key_private_deserialize(&e->request);
503: if (k == NULL) {
1.87 markus 504: buffer_clear(&e->request);
1.33 markus 505: goto send;
1.21 markus 506: }
1.33 markus 507: break;
508: }
1.186 djm 509: if (k == NULL)
510: goto send;
1.87 markus 511: comment = buffer_get_string(&e->request, NULL);
1.186 djm 512:
1.94 markus 513: while (buffer_len(&e->request)) {
1.158 djm 514: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 515: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 516: death = monotime() + buffer_get_int(&e->request);
1.94 markus 517: break;
1.107 markus 518: case SSH_AGENT_CONSTRAIN_CONFIRM:
519: confirm = 1;
520: break;
1.94 markus 521: default:
1.158 djm 522: error("process_add_identity: "
523: "Unknown constraint type %d", type);
1.173 djm 524: free(comment);
1.158 djm 525: key_free(k);
526: goto send;
1.94 markus 527: }
528: }
1.158 djm 529: success = 1;
1.106 marc 530: if (lifetime && !death)
1.175 dtucker 531: death = monotime() + lifetime;
1.157 canacar 532: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 533: id = xcalloc(1, sizeof(Identity));
1.78 provos 534: id->key = k;
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);
1.173 djm 540: free(id->comment);
1.33 markus 541: }
1.157 canacar 542: id->comment = comment;
543: id->death = death;
544: id->confirm = confirm;
1.33 markus 545: send:
1.1 deraadt 546: buffer_put_int(&e->output, 1);
1.33 markus 547: buffer_put_char(&e->output,
548: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 549: }
550:
1.88 markus 551: /* XXX todo: encrypt sensitive data with passphrase */
552: static void
553: process_lock_agent(SocketEntry *e, int lock)
554: {
1.96 deraadt 555: int success = 0;
1.88 markus 556: char *passwd;
557:
558: passwd = buffer_get_string(&e->request, NULL);
559: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
560: locked = 0;
1.183 djm 561: explicit_bzero(lock_passwd, strlen(lock_passwd));
1.173 djm 562: free(lock_passwd);
1.88 markus 563: lock_passwd = NULL;
564: success = 1;
565: } else if (!locked && lock) {
566: locked = 1;
567: lock_passwd = xstrdup(passwd);
568: success = 1;
569: }
1.183 djm 570: explicit_bzero(passwd, strlen(passwd));
1.173 djm 571: free(passwd);
1.95 deraadt 572:
1.88 markus 573: buffer_put_int(&e->output, 1);
574: buffer_put_char(&e->output,
575: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
576: }
577:
578: static void
579: no_identities(SocketEntry *e, u_int type)
580: {
581: Buffer msg;
582:
583: buffer_init(&msg);
584: buffer_put_char(&msg,
585: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
586: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
587: buffer_put_int(&msg, 0);
588: buffer_put_int(&e->output, buffer_len(&msg));
589: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
590: buffer_free(&msg);
591: }
1.59 markus 592:
1.163 markus 593: #ifdef ENABLE_PKCS11
1.59 markus 594: static void
1.158 djm 595: process_add_smartcard_key(SocketEntry *e)
1.59 markus 596: {
1.163 markus 597: char *provider = NULL, *pin;
1.174 dtucker 598: int i, type, version, count = 0, success = 0, confirm = 0;
599: time_t death = 0;
1.163 markus 600: Key **keys = NULL, *k;
1.84 markus 601: Identity *id;
1.59 markus 602: Idtab *tab;
1.75 deraadt 603:
1.163 markus 604: provider = buffer_get_string(&e->request, NULL);
1.87 markus 605: pin = buffer_get_string(&e->request, NULL);
1.110 djm 606:
607: while (buffer_len(&e->request)) {
1.158 djm 608: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 609: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 610: death = monotime() + buffer_get_int(&e->request);
1.110 djm 611: break;
612: case SSH_AGENT_CONSTRAIN_CONFIRM:
613: confirm = 1;
614: break;
615: default:
1.158 djm 616: error("process_add_smartcard_key: "
617: "Unknown constraint type %d", type);
618: goto send;
1.110 djm 619: }
620: }
621: if (lifetime && !death)
1.175 dtucker 622: death = monotime() + lifetime;
1.110 djm 623:
1.163 markus 624: count = pkcs11_add_provider(provider, pin, &keys);
625: for (i = 0; i < count; i++) {
1.84 markus 626: k = keys[i];
627: version = k->type == KEY_RSA1 ? 1 : 2;
628: tab = idtab_lookup(version);
629: if (lookup_identity(k, version) == NULL) {
1.163 markus 630: id = xcalloc(1, sizeof(Identity));
1.84 markus 631: id->key = k;
1.163 markus 632: id->provider = xstrdup(provider);
633: id->comment = xstrdup(provider); /* XXX */
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: }
644: send:
1.173 djm 645: free(pin);
646: free(provider);
647: free(keys);
1.59 markus 648: buffer_put_int(&e->output, 1);
649: buffer_put_char(&e->output,
650: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
651: }
652:
653: static void
654: process_remove_smartcard_key(SocketEntry *e)
655: {
1.163 markus 656: char *provider = NULL, *pin = NULL;
657: int version, success = 0;
658: Identity *id, *nxt;
1.84 markus 659: Idtab *tab;
1.59 markus 660:
1.163 markus 661: provider = buffer_get_string(&e->request, NULL);
1.87 markus 662: pin = buffer_get_string(&e->request, NULL);
1.173 djm 663: free(pin);
1.59 markus 664:
1.163 markus 665: for (version = 1; version < 3; version++) {
666: tab = idtab_lookup(version);
667: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
668: nxt = TAILQ_NEXT(id, next);
1.181 djm 669: /* Skip file--based keys */
670: if (id->provider == NULL)
671: continue;
1.163 markus 672: if (!strcmp(provider, id->provider)) {
673: TAILQ_REMOVE(&tab->idlist, id, next);
674: free_identity(id);
675: tab->nentries--;
676: }
1.59 markus 677: }
678: }
1.163 markus 679: if (pkcs11_del_provider(provider) == 0)
680: success = 1;
681: else
682: error("process_remove_smartcard_key:"
683: " pkcs11_del_provider failed");
1.173 djm 684: free(provider);
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: }
1.163 markus 689: #endif /* ENABLE_PKCS11 */
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;
1.185 markus 740: #ifdef WITH_SSH1
1.33 markus 741: /* ssh1 */
742: case SSH_AGENTC_RSA_CHALLENGE:
743: process_authentication_challenge1(e);
744: break;
1.21 markus 745: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 746: process_request_identities(e, 1);
1.21 markus 747: break;
748: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 749: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 750: process_add_identity(e, 1);
1.21 markus 751: break;
752: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 753: process_remove_identity(e, 1);
1.21 markus 754: break;
755: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 756: process_remove_all_identities(e, 1);
757: break;
1.185 markus 758: #endif
1.33 markus 759: /* ssh2 */
760: case SSH2_AGENTC_SIGN_REQUEST:
761: process_sign_request2(e);
762: break;
763: case SSH2_AGENTC_REQUEST_IDENTITIES:
764: process_request_identities(e, 2);
765: break;
766: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 767: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 768: process_add_identity(e, 2);
769: break;
770: case SSH2_AGENTC_REMOVE_IDENTITY:
771: process_remove_identity(e, 2);
772: break;
773: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
774: process_remove_all_identities(e, 2);
1.21 markus 775: break;
1.163 markus 776: #ifdef ENABLE_PKCS11
1.59 markus 777: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 778: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 779: process_add_smartcard_key(e);
1.75 deraadt 780: break;
1.59 markus 781: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
782: process_remove_smartcard_key(e);
1.75 deraadt 783: break;
1.163 markus 784: #endif /* ENABLE_PKCS11 */
1.21 markus 785: default:
786: /* Unknown message. Respond with failure. */
787: error("Unknown message %d", type);
1.87 markus 788: buffer_clear(&e->request);
1.21 markus 789: buffer_put_int(&e->output, 1);
790: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
791: break;
792: }
1.1 deraadt 793: }
794:
1.55 itojun 795: static void
1.73 stevesk 796: new_socket(sock_type type, int fd)
1.1 deraadt 797: {
1.112 markus 798: u_int i, old_alloc, new_alloc;
1.96 deraadt 799:
1.119 djm 800: set_nonblock(fd);
1.21 markus 801:
802: if (fd > max_fd)
803: max_fd = fd;
804:
805: for (i = 0; i < sockets_alloc; i++)
806: if (sockets[i].type == AUTH_UNUSED) {
807: sockets[i].fd = fd;
808: buffer_init(&sockets[i].input);
809: buffer_init(&sockets[i].output);
1.87 markus 810: buffer_init(&sockets[i].request);
1.112 markus 811: sockets[i].type = type;
1.21 markus 812: return;
813: }
814: old_alloc = sockets_alloc;
1.112 markus 815: new_alloc = sockets_alloc + 10;
1.133 djm 816: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 817: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 818: sockets[i].type = AUTH_UNUSED;
1.112 markus 819: sockets_alloc = new_alloc;
1.21 markus 820: sockets[old_alloc].fd = fd;
821: buffer_init(&sockets[old_alloc].input);
822: buffer_init(&sockets[old_alloc].output);
1.87 markus 823: buffer_init(&sockets[old_alloc].request);
1.112 markus 824: sockets[old_alloc].type = type;
1.1 deraadt 825: }
826:
1.55 itojun 827: static int
1.155 dtucker 828: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
829: struct timeval **tvpp)
1.1 deraadt 830: {
1.174 dtucker 831: u_int i, sz;
1.46 markus 832: int n = 0;
1.155 dtucker 833: static struct timeval tv;
1.174 dtucker 834: time_t deadline;
1.46 markus 835:
836: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 837: switch (sockets[i].type) {
838: case AUTH_SOCKET:
839: case AUTH_CONNECTION:
1.46 markus 840: n = MAX(n, sockets[i].fd);
1.21 markus 841: break;
842: case AUTH_UNUSED:
843: break;
844: default:
845: fatal("Unknown socket type %d", sockets[i].type);
846: break;
847: }
1.46 markus 848: }
849:
850: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 851: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 852: free(*fdrp);
853: free(*fdwp);
1.46 markus 854: *fdrp = xmalloc(sz);
855: *fdwp = xmalloc(sz);
1.66 markus 856: *nallocp = sz;
1.46 markus 857: }
1.66 markus 858: if (n < *fdl)
859: debug("XXX shrink: %d < %d", n, *fdl);
860: *fdl = n;
1.46 markus 861: memset(*fdrp, 0, sz);
862: memset(*fdwp, 0, sz);
863:
864: for (i = 0; i < sockets_alloc; i++) {
865: switch (sockets[i].type) {
866: case AUTH_SOCKET:
867: case AUTH_CONNECTION:
868: FD_SET(sockets[i].fd, *fdrp);
869: if (buffer_len(&sockets[i].output) > 0)
870: FD_SET(sockets[i].fd, *fdwp);
871: break;
872: default:
873: break;
874: }
875: }
1.155 dtucker 876: deadline = reaper();
877: if (parent_alive_interval != 0)
878: deadline = (deadline == 0) ? parent_alive_interval :
879: MIN(deadline, parent_alive_interval);
880: if (deadline == 0) {
881: *tvpp = NULL;
882: } else {
883: tv.tv_sec = deadline;
884: tv.tv_usec = 0;
885: *tvpp = &tv;
886: }
1.46 markus 887: return (1);
1.21 markus 888: }
889:
1.55 itojun 890: static void
1.21 markus 891: after_select(fd_set *readset, fd_set *writeset)
892: {
1.96 deraadt 893: struct sockaddr_un sunaddr;
1.26 markus 894: socklen_t slen;
1.21 markus 895: char buf[1024];
1.96 deraadt 896: int len, sock;
1.162 djm 897: u_int i, orig_alloc;
1.103 markus 898: uid_t euid;
899: gid_t egid;
1.21 markus 900:
1.162 djm 901: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 902: switch (sockets[i].type) {
903: case AUTH_UNUSED:
904: break;
905: case AUTH_SOCKET:
906: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 907: slen = sizeof(sunaddr);
1.46 markus 908: sock = accept(sockets[i].fd,
1.131 deraadt 909: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 910: if (sock < 0) {
1.81 stevesk 911: error("accept from AUTH_SOCKET: %s",
912: strerror(errno));
1.103 markus 913: break;
914: }
915: if (getpeereid(sock, &euid, &egid) < 0) {
916: error("getpeereid %d failed: %s",
917: sock, strerror(errno));
918: close(sock);
919: break;
920: }
1.105 markus 921: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 922: error("uid mismatch: "
1.104 stevesk 923: "peer euid %u != uid %u",
924: (u_int) euid, (u_int) getuid());
1.103 markus 925: close(sock);
1.21 markus 926: break;
927: }
928: new_socket(AUTH_CONNECTION, sock);
929: }
930: break;
931: case AUTH_CONNECTION:
932: if (buffer_len(&sockets[i].output) > 0 &&
933: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 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;
1.21 markus 940: if (len <= 0) {
1.101 stevesk 941: close_socket(&sockets[i]);
1.21 markus 942: break;
943: }
944: buffer_consume(&sockets[i].output, len);
945: }
946: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 947: len = read(sockets[i].fd, buf, sizeof(buf));
948: if (len == -1 && (errno == EAGAIN ||
949: errno == EINTR))
950: continue;
1.21 markus 951: if (len <= 0) {
1.101 stevesk 952: close_socket(&sockets[i]);
1.21 markus 953: break;
954: }
955: buffer_append(&sockets[i].input, buf, len);
1.190 ! dtucker 956: explicit_bzero(buf, sizeof(buf));
1.21 markus 957: process_message(&sockets[i]);
958: }
959: break;
960: default:
961: fatal("Unknown type %d", sockets[i].type);
962: }
1.1 deraadt 963: }
964:
1.55 itojun 965: static void
1.113 markus 966: cleanup_socket(void)
1.15 markus 967: {
1.187 djm 968: if (cleanup_pid != 0 && getpid() != cleanup_pid)
969: return;
970: debug("%s: cleanup", __func__);
1.48 deraadt 971: if (socket_name[0])
972: unlink(socket_name);
973: if (socket_dir[0])
974: rmdir(socket_dir);
1.10 markus 975: }
976:
1.114 markus 977: void
1.15 markus 978: cleanup_exit(int i)
979: {
1.113 markus 980: cleanup_socket();
981: _exit(i);
1.15 markus 982: }
983:
1.135 deraadt 984: /*ARGSUSED*/
1.55 itojun 985: static void
1.48 deraadt 986: cleanup_handler(int sig)
987: {
1.113 markus 988: cleanup_socket();
1.163 markus 989: #ifdef ENABLE_PKCS11
990: pkcs11_terminate();
991: #endif
1.48 deraadt 992: _exit(2);
1.113 markus 993: }
994:
1.68 markus 995: static void
1.155 dtucker 996: check_parent_exists(void)
1.68 markus 997: {
1.172 dtucker 998: /*
999: * If our parent has exited then getppid() will return (pid_t)1,
1000: * so testing for that should be safe.
1001: */
1002: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1003: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1004: cleanup_socket();
1005: _exit(2);
1.68 markus 1006: }
1.48 deraadt 1007: }
1008:
1.55 itojun 1009: static void
1.50 itojun 1010: usage(void)
1.15 markus 1011: {
1.184 deraadt 1012: fprintf(stderr,
1013: "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-t life]\n"
1014: " [command [arg ...]]\n"
1015: " ssh-agent [-c | -s] -k\n");
1.21 markus 1016: exit(1);
1.15 markus 1017: }
1018:
1.2 provos 1019: int
1020: main(int ac, char **av)
1.1 deraadt 1021: {
1.107 markus 1022: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1023: int sock, fd, ch, result, saved_errno;
1.120 avsm 1024: u_int nalloc;
1.96 deraadt 1025: char *shell, *format, *pidstr, *agentsocket = NULL;
1026: fd_set *readsetp = NULL, *writesetp = NULL;
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;
1.161 tobias 1033: size_t len;
1.189 djm 1034: mode_t prev_mask;
1.123 djm 1035:
1036: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1037: sanitise_stdfd();
1.99 markus 1038:
1039: /* drop */
1040: setegid(getgid());
1041: setgid(getgid());
1.53 markus 1042:
1.185 markus 1043: #ifdef WITH_OPENSSL
1.170 djm 1044: OpenSSL_add_all_algorithms();
1.185 markus 1045: #endif
1.21 markus 1046:
1.106 marc 1047: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1048: switch (ch) {
1049: case 'c':
1050: if (s_flag)
1051: usage();
1052: c_flag++;
1053: break;
1054: case 'k':
1055: k_flag++;
1056: break;
1057: case 's':
1058: if (c_flag)
1059: usage();
1060: s_flag++;
1061: break;
1.57 markus 1062: case 'd':
1063: if (d_flag)
1064: usage();
1065: d_flag++;
1066: break;
1.86 markus 1067: case 'a':
1068: agentsocket = optarg;
1.106 marc 1069: break;
1070: case 't':
1071: if ((lifetime = convtime(optarg)) == -1) {
1072: fprintf(stderr, "Invalid lifetime\n");
1073: usage();
1074: }
1.86 markus 1075: break;
1.21 markus 1076: default:
1077: usage();
1078: }
1079: }
1080: ac -= optind;
1081: av += optind;
1082:
1.57 markus 1083: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1084: usage();
1085:
1.85 markus 1086: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1087: shell = getenv("SHELL");
1.161 tobias 1088: if (shell != NULL && (len = strlen(shell)) > 2 &&
1089: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1090: c_flag = 1;
1091: }
1092: if (k_flag) {
1.136 deraadt 1093: const char *errstr = NULL;
1094:
1.21 markus 1095: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1096: if (pidstr == NULL) {
1097: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1098: SSH_AGENTPID_ENV_NAME);
1.21 markus 1099: exit(1);
1100: }
1.136 deraadt 1101: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1102: if (errstr) {
1103: fprintf(stderr,
1104: "%s=\"%s\", which is not a good PID: %s\n",
1105: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1106: exit(1);
1107: }
1108: if (kill(pid, SIGTERM) == -1) {
1109: perror("kill");
1110: exit(1);
1111: }
1112: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1113: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1114: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1115: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1116: exit(0);
1117: }
1118: parent_pid = getpid();
1119:
1.86 markus 1120: if (agentsocket == NULL) {
1121: /* Create private directory for agent socket */
1.171 djm 1122: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1123: if (mkdtemp(socket_dir) == NULL) {
1124: perror("mkdtemp: private socket dir");
1125: exit(1);
1126: }
1.91 mpech 1127: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1128: (long)parent_pid);
1.86 markus 1129: } else {
1130: /* Try to use specified agent socket */
1131: socket_dir[0] = '\0';
1132: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1133: }
1134:
1.23 markus 1135: /*
1136: * Create socket early so it will exist before command gets run from
1137: * the parent.
1138: */
1.189 djm 1139: prev_mask = umask(0177);
1.188 millert 1140: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 1141: if (sock < 0) {
1.188 millert 1142: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 1143: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1144: cleanup_exit(1);
1145: }
1.189 djm 1146: umask(prev_mask);
1.46 markus 1147:
1.23 markus 1148: /*
1149: * Fork, and have the parent execute the command, if any, or present
1150: * the socket data. The child continues as the authentication agent.
1151: */
1.57 markus 1152: if (d_flag) {
1153: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1154: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1155: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1156: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1157: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1158: goto skip;
1159: }
1.21 markus 1160: pid = fork();
1161: if (pid == -1) {
1162: perror("fork");
1.81 stevesk 1163: cleanup_exit(1);
1.21 markus 1164: }
1165: if (pid != 0) { /* Parent - execute the given command. */
1166: close(sock);
1.91 mpech 1167: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1168: if (ac == 0) {
1169: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1170: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1171: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1172: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1173: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1174: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1175: exit(0);
1176: }
1.36 deraadt 1177: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1178: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1179: perror("setenv");
1180: exit(1);
1181: }
1.21 markus 1182: execvp(av[0], av);
1183: perror(av[0]);
1184: exit(1);
1185: }
1.81 stevesk 1186: /* child */
1187: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1188:
1189: if (setsid() == -1) {
1.81 stevesk 1190: error("setsid: %s", strerror(errno));
1.67 stevesk 1191: cleanup_exit(1);
1192: }
1193:
1194: (void)chdir("/");
1.107 markus 1195: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1196: /* XXX might close listen socket */
1197: (void)dup2(fd, STDIN_FILENO);
1198: (void)dup2(fd, STDOUT_FILENO);
1199: (void)dup2(fd, STDERR_FILENO);
1200: if (fd > 2)
1201: close(fd);
1202: }
1.21 markus 1203:
1.41 markus 1204: /* deny core dumps, since memory contains unencrypted private keys */
1205: rlim.rlim_cur = rlim.rlim_max = 0;
1206: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1207: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1208: cleanup_exit(1);
1209: }
1.57 markus 1210:
1211: skip:
1.187 djm 1212:
1213: cleanup_pid = getpid();
1.163 markus 1214:
1215: #ifdef ENABLE_PKCS11
1216: pkcs11_init(0);
1217: #endif
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: signal(SIGPIPE, SIG_IGN);
1.177 djm 1223: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1224: signal(SIGHUP, cleanup_handler);
1225: signal(SIGTERM, cleanup_handler);
1.66 markus 1226: nalloc = 0;
1227:
1.21 markus 1228: while (1) {
1.155 dtucker 1229: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1230: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1231: saved_errno = errno;
1.155 dtucker 1232: if (parent_alive_interval != 0)
1233: check_parent_exists();
1234: (void) reaper(); /* remove expired keys */
1.154 dtucker 1235: if (result < 0) {
1236: if (saved_errno == EINTR)
1.21 markus 1237: continue;
1.154 dtucker 1238: fatal("select: %s", strerror(saved_errno));
1239: } else if (result > 0)
1240: after_select(readsetp, writesetp);
1.15 markus 1241: }
1.21 markus 1242: /* NOTREACHED */
1.1 deraadt 1243: }
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