Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.185
1.185 ! markus 1: /* $OpenBSD: ssh-agent.c,v 1.184 2014/03/15 17:28:26 deraadt 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:
1.185 ! 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:
115: /* pathname and directory for AUTH_SOCKET */
1.132 djm 116: char socket_name[MAXPATHLEN];
117: char socket_dir[MAXPATHLEN];
1.10 markus 118:
1.88 markus 119: /* locking */
120: int locked = 0;
121: char *lock_passwd = NULL;
122:
1.20 markus 123: extern char *__progname;
124:
1.174 dtucker 125: /* Default lifetime in seconds (0 == forever) */
126: static long lifetime = 0;
1.106 marc 127:
1.55 itojun 128: static void
1.101 stevesk 129: close_socket(SocketEntry *e)
130: {
131: close(e->fd);
132: e->fd = -1;
133: e->type = AUTH_UNUSED;
134: buffer_free(&e->input);
135: buffer_free(&e->output);
136: buffer_free(&e->request);
137: }
138:
139: static void
1.33 markus 140: idtab_init(void)
1.1 deraadt 141: {
1.33 markus 142: int i;
1.96 deraadt 143:
1.74 deraadt 144: for (i = 0; i <=2; i++) {
1.78 provos 145: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 146: idtable[i].nentries = 0;
147: }
148: }
149:
150: /* return private key table for requested protocol version */
1.55 itojun 151: static Idtab *
1.33 markus 152: idtab_lookup(int version)
153: {
154: if (version < 1 || version > 2)
155: fatal("internal error, bad protocol version %d", version);
156: return &idtable[version];
157: }
158:
1.89 markus 159: static void
160: free_identity(Identity *id)
161: {
162: key_free(id->key);
1.173 djm 163: free(id->provider);
164: free(id->comment);
165: free(id);
1.89 markus 166: }
167:
1.33 markus 168: /* return matching private key for given public key */
1.78 provos 169: static Identity *
170: lookup_identity(Key *key, int version)
1.33 markus 171: {
1.78 provos 172: Identity *id;
173:
1.33 markus 174: Idtab *tab = idtab_lookup(version);
1.78 provos 175: TAILQ_FOREACH(id, &tab->idlist, next) {
176: if (key_equal(key, id->key))
177: return (id);
1.33 markus 178: }
1.78 provos 179: return (NULL);
180: }
181:
1.107 markus 182: /* Check confirmation of keysign request */
183: static int
184: confirm_key(Identity *id)
185: {
1.122 djm 186: char *p;
1.107 markus 187: int ret = -1;
188:
189: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 190: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
191: id->comment, p))
192: ret = 0;
1.173 djm 193: free(p);
1.122 djm 194:
1.107 markus 195: return (ret);
196: }
197:
1.33 markus 198: /* send list of supported public keys to 'client' */
1.55 itojun 199: static void
1.33 markus 200: process_request_identities(SocketEntry *e, int version)
201: {
202: Idtab *tab = idtab_lookup(version);
1.96 deraadt 203: Identity *id;
1.21 markus 204: Buffer msg;
1.1 deraadt 205:
1.21 markus 206: buffer_init(&msg);
1.33 markus 207: buffer_put_char(&msg, (version == 1) ?
208: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
209: buffer_put_int(&msg, tab->nentries);
1.78 provos 210: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 211: if (id->key->type == KEY_RSA1) {
1.185 ! markus 212: #ifdef WITH_SSH1
1.33 markus 213: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
214: buffer_put_bignum(&msg, id->key->rsa->e);
215: buffer_put_bignum(&msg, id->key->rsa->n);
1.185 ! markus 216: #endif
1.33 markus 217: } else {
1.45 markus 218: u_char *blob;
219: u_int blen;
1.39 markus 220: key_to_blob(id->key, &blob, &blen);
1.33 markus 221: buffer_put_string(&msg, blob, blen);
1.173 djm 222: free(blob);
1.33 markus 223: }
224: buffer_put_cstring(&msg, id->comment);
1.21 markus 225: }
226: buffer_put_int(&e->output, buffer_len(&msg));
227: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
228: buffer_free(&msg);
1.1 deraadt 229: }
230:
1.185 ! markus 231: #ifdef WITH_SSH1
1.33 markus 232: /* ssh1 only */
1.55 itojun 233: static void
1.33 markus 234: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 235: {
1.96 deraadt 236: u_char buf[32], mdbuf[16], session_id[16];
237: u_int response_type;
238: BIGNUM *challenge;
1.78 provos 239: Identity *id;
1.33 markus 240: int i, len;
1.21 markus 241: Buffer msg;
1.182 markus 242: struct ssh_digest_ctx *md;
1.96 deraadt 243: Key *key;
1.21 markus 244:
245: buffer_init(&msg);
1.39 markus 246: key = key_new(KEY_RSA1);
1.76 markus 247: if ((challenge = BN_new()) == NULL)
248: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 249:
1.97 markus 250: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 251: buffer_get_bignum(&e->request, key->rsa->e);
252: buffer_get_bignum(&e->request, key->rsa->n);
253: buffer_get_bignum(&e->request, challenge);
1.21 markus 254:
1.33 markus 255: /* Only protocol 1.1 is supported */
1.87 markus 256: if (buffer_len(&e->request) == 0)
1.33 markus 257: goto failure;
1.87 markus 258: buffer_get(&e->request, session_id, 16);
259: response_type = buffer_get_int(&e->request);
1.33 markus 260: if (response_type != 1)
261: goto failure;
262:
1.78 provos 263: id = lookup_identity(key, 1);
1.107 markus 264: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 265: Key *private = id->key;
1.33 markus 266: /* Decrypt the challenge using the private key. */
1.49 markus 267: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
268: goto failure;
1.33 markus 269:
270: /* The response is MD5 of decrypted challenge plus session id. */
271: len = BN_num_bytes(challenge);
272: if (len <= 0 || len > 32) {
1.109 itojun 273: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 274: goto failure;
275: }
276: memset(buf, 0, 32);
277: BN_bn2bin(challenge, buf + 32 - len);
1.182 markus 278: if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
279: ssh_digest_update(md, buf, 32) < 0 ||
280: ssh_digest_update(md, session_id, 16) < 0 ||
281: ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
282: fatal("%s: md5 failed", __func__);
283: ssh_digest_free(md);
1.33 markus 284:
285: /* Send the response. */
286: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
287: for (i = 0; i < 16; i++)
288: buffer_put_char(&msg, mdbuf[i]);
289: goto send;
290: }
1.21 markus 291:
1.33 markus 292: failure:
293: /* Unknown identity or protocol error. Send failure. */
1.21 markus 294: buffer_put_char(&msg, SSH_AGENT_FAILURE);
295: send:
296: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 297: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
298: key_free(key);
299: BN_clear_free(challenge);
300: buffer_free(&msg);
301: }
1.185 ! markus 302: #endif
1.33 markus 303:
304: /* ssh2 only */
1.55 itojun 305: static void
1.33 markus 306: process_sign_request2(SocketEntry *e)
307: {
1.45 markus 308: u_char *blob, *data, *signature = NULL;
309: u_int blen, dlen, slen = 0;
1.96 deraadt 310: extern int datafellows;
1.159 djm 311: int odatafellows;
1.96 deraadt 312: int ok = -1, flags;
1.33 markus 313: Buffer msg;
1.96 deraadt 314: Key *key;
1.33 markus 315:
316: datafellows = 0;
1.43 markus 317:
1.87 markus 318: blob = buffer_get_string(&e->request, &blen);
319: data = buffer_get_string(&e->request, &dlen);
1.37 markus 320:
1.87 markus 321: flags = buffer_get_int(&e->request);
1.159 djm 322: odatafellows = datafellows;
1.37 markus 323: if (flags & SSH_AGENT_OLD_SIGNATURE)
324: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 325:
1.39 markus 326: key = key_from_blob(blob, blen);
1.33 markus 327: if (key != NULL) {
1.78 provos 328: Identity *id = lookup_identity(key, 2);
1.107 markus 329: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 330: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 331: key_free(key);
1.33 markus 332: }
333: buffer_init(&msg);
334: if (ok == 0) {
335: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
336: buffer_put_string(&msg, signature, slen);
337: } else {
338: buffer_put_char(&msg, SSH_AGENT_FAILURE);
339: }
340: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 341: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 342: buffer_len(&msg));
1.21 markus 343: buffer_free(&msg);
1.173 djm 344: free(data);
345: free(blob);
346: free(signature);
1.159 djm 347: datafellows = odatafellows;
1.1 deraadt 348: }
349:
1.33 markus 350: /* shared */
1.55 itojun 351: static void
1.33 markus 352: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 353: {
1.96 deraadt 354: u_int blen, bits;
355: int success = 0;
1.78 provos 356: Key *key = NULL;
1.45 markus 357: u_char *blob;
1.21 markus 358:
1.74 deraadt 359: switch (version) {
1.33 markus 360: case 1:
1.39 markus 361: key = key_new(KEY_RSA1);
1.87 markus 362: bits = buffer_get_int(&e->request);
363: buffer_get_bignum(&e->request, key->rsa->e);
364: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 365:
366: if (bits != key_size(key))
1.109 itojun 367: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 368: key_size(key), bits);
1.33 markus 369: break;
370: case 2:
1.87 markus 371: blob = buffer_get_string(&e->request, &blen);
1.39 markus 372: key = key_from_blob(blob, blen);
1.173 djm 373: free(blob);
1.33 markus 374: break;
375: }
376: if (key != NULL) {
1.78 provos 377: Identity *id = lookup_identity(key, version);
378: if (id != NULL) {
1.23 markus 379: /*
380: * We have this key. Free the old key. Since we
1.124 djm 381: * don't want to leave empty slots in the middle of
1.40 markus 382: * the array, we actually free the key there and move
383: * all the entries between the empty slot and the end
384: * of the array.
1.23 markus 385: */
1.33 markus 386: Idtab *tab = idtab_lookup(version);
1.38 markus 387: if (tab->nentries < 1)
388: fatal("process_remove_identity: "
389: "internal error: tab->nentries %d",
390: tab->nentries);
1.78 provos 391: TAILQ_REMOVE(&tab->idlist, id, next);
392: free_identity(id);
1.33 markus 393: tab->nentries--;
394: success = 1;
1.21 markus 395: }
1.33 markus 396: key_free(key);
397: }
1.1 deraadt 398: buffer_put_int(&e->output, 1);
1.33 markus 399: buffer_put_char(&e->output,
400: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 401: }
402:
1.55 itojun 403: static void
1.33 markus 404: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 405: {
1.33 markus 406: Idtab *tab = idtab_lookup(version);
1.78 provos 407: Identity *id;
1.21 markus 408:
409: /* Loop over all identities and clear the keys. */
1.78 provos 410: for (id = TAILQ_FIRST(&tab->idlist); id;
411: id = TAILQ_FIRST(&tab->idlist)) {
412: TAILQ_REMOVE(&tab->idlist, id, next);
413: free_identity(id);
1.21 markus 414: }
415:
416: /* Mark that there are no identities. */
1.33 markus 417: tab->nentries = 0;
1.21 markus 418:
419: /* Send success. */
420: buffer_put_int(&e->output, 1);
421: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 422: }
423:
1.155 dtucker 424: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 425: static time_t
1.89 markus 426: reaper(void)
427: {
1.175 dtucker 428: time_t deadline = 0, now = monotime();
1.89 markus 429: Identity *id, *nxt;
430: int version;
1.96 deraadt 431: Idtab *tab;
1.89 markus 432:
433: for (version = 1; version < 3; version++) {
434: tab = idtab_lookup(version);
435: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
436: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 437: if (id->death == 0)
438: continue;
439: if (now >= id->death) {
1.154 dtucker 440: debug("expiring key '%s'", id->comment);
1.89 markus 441: TAILQ_REMOVE(&tab->idlist, id, next);
442: free_identity(id);
443: tab->nentries--;
1.155 dtucker 444: } else
445: deadline = (deadline == 0) ? id->death :
446: MIN(deadline, id->death);
1.89 markus 447: }
448: }
1.155 dtucker 449: if (deadline == 0 || deadline <= now)
450: return 0;
451: else
452: return (deadline - now);
1.89 markus 453: }
454:
455: static void
1.33 markus 456: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 457: {
1.96 deraadt 458: Idtab *tab = idtab_lookup(version);
1.157 canacar 459: Identity *id;
1.174 dtucker 460: int type, success = 0, confirm = 0;
1.178 markus 461: char *comment;
1.174 dtucker 462: time_t death = 0;
1.33 markus 463: Key *k = NULL;
464:
465: switch (version) {
466: case 1:
1.39 markus 467: k = key_new_private(KEY_RSA1);
1.97 markus 468: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 469: buffer_get_bignum(&e->request, k->rsa->n);
470: buffer_get_bignum(&e->request, k->rsa->e);
471: buffer_get_bignum(&e->request, k->rsa->d);
472: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 473:
474: /* SSH and SSL have p and q swapped */
1.87 markus 475: buffer_get_bignum(&e->request, k->rsa->q); /* p */
476: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 477:
478: /* Generate additional parameters */
1.60 markus 479: rsa_generate_additional_parameters(k->rsa);
1.178 markus 480:
1.180 markus 481: /* enable blinding */
1.178 markus 482: if (RSA_blinding_on(k->rsa, NULL) != 1) {
483: error("process_add_identity: RSA_blinding_on failed");
484: key_free(k);
485: goto send;
486: }
1.33 markus 487: break;
488: case 2:
1.178 markus 489: k = key_private_deserialize(&e->request);
490: if (k == NULL) {
1.87 markus 491: buffer_clear(&e->request);
1.33 markus 492: goto send;
1.21 markus 493: }
1.33 markus 494: break;
495: }
1.87 markus 496: comment = buffer_get_string(&e->request, NULL);
1.33 markus 497: if (k == NULL) {
1.173 djm 498: free(comment);
1.33 markus 499: goto send;
500: }
1.94 markus 501: while (buffer_len(&e->request)) {
1.158 djm 502: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 503: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 504: death = monotime() + buffer_get_int(&e->request);
1.94 markus 505: break;
1.107 markus 506: case SSH_AGENT_CONSTRAIN_CONFIRM:
507: confirm = 1;
508: break;
1.94 markus 509: default:
1.158 djm 510: error("process_add_identity: "
511: "Unknown constraint type %d", type);
1.173 djm 512: free(comment);
1.158 djm 513: key_free(k);
514: goto send;
1.94 markus 515: }
516: }
1.158 djm 517: success = 1;
1.106 marc 518: if (lifetime && !death)
1.175 dtucker 519: death = monotime() + lifetime;
1.157 canacar 520: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 521: id = xcalloc(1, sizeof(Identity));
1.78 provos 522: id->key = k;
523: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 524: /* Increment the number of identities. */
525: tab->nentries++;
526: } else {
527: key_free(k);
1.173 djm 528: free(id->comment);
1.33 markus 529: }
1.157 canacar 530: id->comment = comment;
531: id->death = death;
532: id->confirm = confirm;
1.33 markus 533: send:
1.1 deraadt 534: buffer_put_int(&e->output, 1);
1.33 markus 535: buffer_put_char(&e->output,
536: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 537: }
538:
1.88 markus 539: /* XXX todo: encrypt sensitive data with passphrase */
540: static void
541: process_lock_agent(SocketEntry *e, int lock)
542: {
1.96 deraadt 543: int success = 0;
1.88 markus 544: char *passwd;
545:
546: passwd = buffer_get_string(&e->request, NULL);
547: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
548: locked = 0;
1.183 djm 549: explicit_bzero(lock_passwd, strlen(lock_passwd));
1.173 djm 550: free(lock_passwd);
1.88 markus 551: lock_passwd = NULL;
552: success = 1;
553: } else if (!locked && lock) {
554: locked = 1;
555: lock_passwd = xstrdup(passwd);
556: success = 1;
557: }
1.183 djm 558: explicit_bzero(passwd, strlen(passwd));
1.173 djm 559: free(passwd);
1.95 deraadt 560:
1.88 markus 561: buffer_put_int(&e->output, 1);
562: buffer_put_char(&e->output,
563: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
564: }
565:
566: static void
567: no_identities(SocketEntry *e, u_int type)
568: {
569: Buffer msg;
570:
571: buffer_init(&msg);
572: buffer_put_char(&msg,
573: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
574: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
575: buffer_put_int(&msg, 0);
576: buffer_put_int(&e->output, buffer_len(&msg));
577: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
578: buffer_free(&msg);
579: }
1.59 markus 580:
1.163 markus 581: #ifdef ENABLE_PKCS11
1.59 markus 582: static void
1.158 djm 583: process_add_smartcard_key(SocketEntry *e)
1.59 markus 584: {
1.163 markus 585: char *provider = NULL, *pin;
1.174 dtucker 586: int i, type, version, count = 0, success = 0, confirm = 0;
587: time_t death = 0;
1.163 markus 588: Key **keys = NULL, *k;
1.84 markus 589: Identity *id;
1.59 markus 590: Idtab *tab;
1.75 deraadt 591:
1.163 markus 592: provider = buffer_get_string(&e->request, NULL);
1.87 markus 593: pin = buffer_get_string(&e->request, NULL);
1.110 djm 594:
595: while (buffer_len(&e->request)) {
1.158 djm 596: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 597: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 598: death = monotime() + buffer_get_int(&e->request);
1.110 djm 599: break;
600: case SSH_AGENT_CONSTRAIN_CONFIRM:
601: confirm = 1;
602: break;
603: default:
1.158 djm 604: error("process_add_smartcard_key: "
605: "Unknown constraint type %d", type);
606: goto send;
1.110 djm 607: }
608: }
609: if (lifetime && !death)
1.175 dtucker 610: death = monotime() + lifetime;
1.110 djm 611:
1.163 markus 612: count = pkcs11_add_provider(provider, pin, &keys);
613: for (i = 0; i < count; i++) {
1.84 markus 614: k = keys[i];
615: version = k->type == KEY_RSA1 ? 1 : 2;
616: tab = idtab_lookup(version);
617: if (lookup_identity(k, version) == NULL) {
1.163 markus 618: id = xcalloc(1, sizeof(Identity));
1.84 markus 619: id->key = k;
1.163 markus 620: id->provider = xstrdup(provider);
621: id->comment = xstrdup(provider); /* XXX */
1.110 djm 622: id->death = death;
623: id->confirm = confirm;
1.84 markus 624: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
625: tab->nentries++;
626: success = 1;
627: } else {
628: key_free(k);
629: }
630: keys[i] = NULL;
1.59 markus 631: }
632: send:
1.173 djm 633: free(pin);
634: free(provider);
635: free(keys);
1.59 markus 636: buffer_put_int(&e->output, 1);
637: buffer_put_char(&e->output,
638: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
639: }
640:
641: static void
642: process_remove_smartcard_key(SocketEntry *e)
643: {
1.163 markus 644: char *provider = NULL, *pin = NULL;
645: int version, success = 0;
646: Identity *id, *nxt;
1.84 markus 647: Idtab *tab;
1.59 markus 648:
1.163 markus 649: provider = buffer_get_string(&e->request, NULL);
1.87 markus 650: pin = buffer_get_string(&e->request, NULL);
1.173 djm 651: free(pin);
1.59 markus 652:
1.163 markus 653: for (version = 1; version < 3; version++) {
654: tab = idtab_lookup(version);
655: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
656: nxt = TAILQ_NEXT(id, next);
1.181 djm 657: /* Skip file--based keys */
658: if (id->provider == NULL)
659: continue;
1.163 markus 660: if (!strcmp(provider, id->provider)) {
661: TAILQ_REMOVE(&tab->idlist, id, next);
662: free_identity(id);
663: tab->nentries--;
664: }
1.59 markus 665: }
666: }
1.163 markus 667: if (pkcs11_del_provider(provider) == 0)
668: success = 1;
669: else
670: error("process_remove_smartcard_key:"
671: " pkcs11_del_provider failed");
1.173 djm 672: free(provider);
1.59 markus 673: buffer_put_int(&e->output, 1);
674: buffer_put_char(&e->output,
675: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
676: }
1.163 markus 677: #endif /* ENABLE_PKCS11 */
1.59 markus 678:
1.33 markus 679: /* dispatch incoming messages */
680:
1.55 itojun 681: static void
1.2 provos 682: process_message(SocketEntry *e)
1.1 deraadt 683: {
1.96 deraadt 684: u_int msg_len, type;
1.45 markus 685: u_char *cp;
1.89 markus 686:
1.21 markus 687: if (buffer_len(&e->input) < 5)
688: return; /* Incomplete message. */
1.77 stevesk 689: cp = buffer_ptr(&e->input);
1.137 djm 690: msg_len = get_u32(cp);
1.21 markus 691: if (msg_len > 256 * 1024) {
1.101 stevesk 692: close_socket(e);
1.21 markus 693: return;
694: }
695: if (buffer_len(&e->input) < msg_len + 4)
696: return;
1.87 markus 697:
698: /* move the current input to e->request */
1.21 markus 699: buffer_consume(&e->input, 4);
1.87 markus 700: buffer_clear(&e->request);
701: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
702: buffer_consume(&e->input, msg_len);
703: type = buffer_get_char(&e->request);
1.21 markus 704:
1.88 markus 705: /* check wheter agent is locked */
706: if (locked && type != SSH_AGENTC_UNLOCK) {
707: buffer_clear(&e->request);
708: switch (type) {
709: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
710: case SSH2_AGENTC_REQUEST_IDENTITIES:
711: /* send empty lists */
712: no_identities(e, type);
713: break;
714: default:
715: /* send a fail message for all other request types */
716: buffer_put_int(&e->output, 1);
717: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
718: }
719: return;
720: }
721:
1.59 markus 722: debug("type %d", type);
1.21 markus 723: switch (type) {
1.88 markus 724: case SSH_AGENTC_LOCK:
725: case SSH_AGENTC_UNLOCK:
726: process_lock_agent(e, type == SSH_AGENTC_LOCK);
727: break;
1.185 ! markus 728: #ifdef WITH_SSH1
1.33 markus 729: /* ssh1 */
730: case SSH_AGENTC_RSA_CHALLENGE:
731: process_authentication_challenge1(e);
732: break;
1.21 markus 733: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 734: process_request_identities(e, 1);
1.21 markus 735: break;
736: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 737: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 738: process_add_identity(e, 1);
1.21 markus 739: break;
740: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 741: process_remove_identity(e, 1);
1.21 markus 742: break;
743: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 744: process_remove_all_identities(e, 1);
745: break;
1.185 ! markus 746: #endif
1.33 markus 747: /* ssh2 */
748: case SSH2_AGENTC_SIGN_REQUEST:
749: process_sign_request2(e);
750: break;
751: case SSH2_AGENTC_REQUEST_IDENTITIES:
752: process_request_identities(e, 2);
753: break;
754: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 755: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 756: process_add_identity(e, 2);
757: break;
758: case SSH2_AGENTC_REMOVE_IDENTITY:
759: process_remove_identity(e, 2);
760: break;
761: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
762: process_remove_all_identities(e, 2);
1.21 markus 763: break;
1.163 markus 764: #ifdef ENABLE_PKCS11
1.59 markus 765: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 766: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 767: process_add_smartcard_key(e);
1.75 deraadt 768: break;
1.59 markus 769: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
770: process_remove_smartcard_key(e);
1.75 deraadt 771: break;
1.163 markus 772: #endif /* ENABLE_PKCS11 */
1.21 markus 773: default:
774: /* Unknown message. Respond with failure. */
775: error("Unknown message %d", type);
1.87 markus 776: buffer_clear(&e->request);
1.21 markus 777: buffer_put_int(&e->output, 1);
778: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
779: break;
780: }
1.1 deraadt 781: }
782:
1.55 itojun 783: static void
1.73 stevesk 784: new_socket(sock_type type, int fd)
1.1 deraadt 785: {
1.112 markus 786: u_int i, old_alloc, new_alloc;
1.96 deraadt 787:
1.119 djm 788: set_nonblock(fd);
1.21 markus 789:
790: if (fd > max_fd)
791: max_fd = fd;
792:
793: for (i = 0; i < sockets_alloc; i++)
794: if (sockets[i].type == AUTH_UNUSED) {
795: sockets[i].fd = fd;
796: buffer_init(&sockets[i].input);
797: buffer_init(&sockets[i].output);
1.87 markus 798: buffer_init(&sockets[i].request);
1.112 markus 799: sockets[i].type = type;
1.21 markus 800: return;
801: }
802: old_alloc = sockets_alloc;
1.112 markus 803: new_alloc = sockets_alloc + 10;
1.133 djm 804: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 805: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 806: sockets[i].type = AUTH_UNUSED;
1.112 markus 807: sockets_alloc = new_alloc;
1.21 markus 808: sockets[old_alloc].fd = fd;
809: buffer_init(&sockets[old_alloc].input);
810: buffer_init(&sockets[old_alloc].output);
1.87 markus 811: buffer_init(&sockets[old_alloc].request);
1.112 markus 812: sockets[old_alloc].type = type;
1.1 deraadt 813: }
814:
1.55 itojun 815: static int
1.155 dtucker 816: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
817: struct timeval **tvpp)
1.1 deraadt 818: {
1.174 dtucker 819: u_int i, sz;
1.46 markus 820: int n = 0;
1.155 dtucker 821: static struct timeval tv;
1.174 dtucker 822: time_t deadline;
1.46 markus 823:
824: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 825: switch (sockets[i].type) {
826: case AUTH_SOCKET:
827: case AUTH_CONNECTION:
1.46 markus 828: n = MAX(n, sockets[i].fd);
1.21 markus 829: break;
830: case AUTH_UNUSED:
831: break;
832: default:
833: fatal("Unknown socket type %d", sockets[i].type);
834: break;
835: }
1.46 markus 836: }
837:
838: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 839: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 840: free(*fdrp);
841: free(*fdwp);
1.46 markus 842: *fdrp = xmalloc(sz);
843: *fdwp = xmalloc(sz);
1.66 markus 844: *nallocp = sz;
1.46 markus 845: }
1.66 markus 846: if (n < *fdl)
847: debug("XXX shrink: %d < %d", n, *fdl);
848: *fdl = n;
1.46 markus 849: memset(*fdrp, 0, sz);
850: memset(*fdwp, 0, sz);
851:
852: for (i = 0; i < sockets_alloc; i++) {
853: switch (sockets[i].type) {
854: case AUTH_SOCKET:
855: case AUTH_CONNECTION:
856: FD_SET(sockets[i].fd, *fdrp);
857: if (buffer_len(&sockets[i].output) > 0)
858: FD_SET(sockets[i].fd, *fdwp);
859: break;
860: default:
861: break;
862: }
863: }
1.155 dtucker 864: deadline = reaper();
865: if (parent_alive_interval != 0)
866: deadline = (deadline == 0) ? parent_alive_interval :
867: MIN(deadline, parent_alive_interval);
868: if (deadline == 0) {
869: *tvpp = NULL;
870: } else {
871: tv.tv_sec = deadline;
872: tv.tv_usec = 0;
873: *tvpp = &tv;
874: }
1.46 markus 875: return (1);
1.21 markus 876: }
877:
1.55 itojun 878: static void
1.21 markus 879: after_select(fd_set *readset, fd_set *writeset)
880: {
1.96 deraadt 881: struct sockaddr_un sunaddr;
1.26 markus 882: socklen_t slen;
1.21 markus 883: char buf[1024];
1.96 deraadt 884: int len, sock;
1.162 djm 885: u_int i, orig_alloc;
1.103 markus 886: uid_t euid;
887: gid_t egid;
1.21 markus 888:
1.162 djm 889: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 890: switch (sockets[i].type) {
891: case AUTH_UNUSED:
892: break;
893: case AUTH_SOCKET:
894: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 895: slen = sizeof(sunaddr);
1.46 markus 896: sock = accept(sockets[i].fd,
1.131 deraadt 897: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 898: if (sock < 0) {
1.81 stevesk 899: error("accept from AUTH_SOCKET: %s",
900: strerror(errno));
1.103 markus 901: break;
902: }
903: if (getpeereid(sock, &euid, &egid) < 0) {
904: error("getpeereid %d failed: %s",
905: sock, strerror(errno));
906: close(sock);
907: break;
908: }
1.105 markus 909: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 910: error("uid mismatch: "
1.104 stevesk 911: "peer euid %u != uid %u",
912: (u_int) euid, (u_int) getuid());
1.103 markus 913: close(sock);
1.21 markus 914: break;
915: }
916: new_socket(AUTH_CONNECTION, sock);
917: }
918: break;
919: case AUTH_CONNECTION:
920: if (buffer_len(&sockets[i].output) > 0 &&
921: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 922: len = write(sockets[i].fd,
923: buffer_ptr(&sockets[i].output),
924: buffer_len(&sockets[i].output));
925: if (len == -1 && (errno == EAGAIN ||
926: errno == EINTR))
927: continue;
1.21 markus 928: if (len <= 0) {
1.101 stevesk 929: close_socket(&sockets[i]);
1.21 markus 930: break;
931: }
932: buffer_consume(&sockets[i].output, len);
933: }
934: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 935: len = read(sockets[i].fd, buf, sizeof(buf));
936: if (len == -1 && (errno == EAGAIN ||
937: errno == EINTR))
938: continue;
1.21 markus 939: if (len <= 0) {
1.101 stevesk 940: close_socket(&sockets[i]);
1.21 markus 941: break;
942: }
943: buffer_append(&sockets[i].input, buf, len);
944: process_message(&sockets[i]);
945: }
946: break;
947: default:
948: fatal("Unknown type %d", sockets[i].type);
949: }
1.1 deraadt 950: }
951:
1.55 itojun 952: static void
1.113 markus 953: cleanup_socket(void)
1.15 markus 954: {
1.48 deraadt 955: if (socket_name[0])
956: unlink(socket_name);
957: if (socket_dir[0])
958: rmdir(socket_dir);
1.10 markus 959: }
960:
1.114 markus 961: void
1.15 markus 962: cleanup_exit(int i)
963: {
1.113 markus 964: cleanup_socket();
965: _exit(i);
1.15 markus 966: }
967:
1.135 deraadt 968: /*ARGSUSED*/
1.55 itojun 969: static void
1.48 deraadt 970: cleanup_handler(int sig)
971: {
1.113 markus 972: cleanup_socket();
1.163 markus 973: #ifdef ENABLE_PKCS11
974: pkcs11_terminate();
975: #endif
1.48 deraadt 976: _exit(2);
1.113 markus 977: }
978:
1.68 markus 979: static void
1.155 dtucker 980: check_parent_exists(void)
1.68 markus 981: {
1.172 dtucker 982: /*
983: * If our parent has exited then getppid() will return (pid_t)1,
984: * so testing for that should be safe.
985: */
986: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 987: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 988: cleanup_socket();
989: _exit(2);
1.68 markus 990: }
1.48 deraadt 991: }
992:
1.55 itojun 993: static void
1.50 itojun 994: usage(void)
1.15 markus 995: {
1.184 deraadt 996: fprintf(stderr,
997: "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-t life]\n"
998: " [command [arg ...]]\n"
999: " ssh-agent [-c | -s] -k\n");
1.21 markus 1000: exit(1);
1.15 markus 1001: }
1002:
1.2 provos 1003: int
1004: main(int ac, char **av)
1.1 deraadt 1005: {
1.107 markus 1006: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1007: int sock, fd, ch, result, saved_errno;
1.120 avsm 1008: u_int nalloc;
1.96 deraadt 1009: char *shell, *format, *pidstr, *agentsocket = NULL;
1010: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1011: struct sockaddr_un sunaddr;
1.41 markus 1012: struct rlimit rlim;
1.96 deraadt 1013: extern int optind;
1.98 stevesk 1014: extern char *optarg;
1.21 markus 1015: pid_t pid;
1.96 deraadt 1016: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1017: struct timeval *tvp = NULL;
1.161 tobias 1018: size_t len;
1.123 djm 1019:
1020: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1021: sanitise_stdfd();
1.99 markus 1022:
1023: /* drop */
1024: setegid(getgid());
1025: setgid(getgid());
1.53 markus 1026:
1.185 ! markus 1027: #ifdef WITH_OPENSSL
1.170 djm 1028: OpenSSL_add_all_algorithms();
1.185 ! markus 1029: #endif
1.21 markus 1030:
1.106 marc 1031: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1032: switch (ch) {
1033: case 'c':
1034: if (s_flag)
1035: usage();
1036: c_flag++;
1037: break;
1038: case 'k':
1039: k_flag++;
1040: break;
1041: case 's':
1042: if (c_flag)
1043: usage();
1044: s_flag++;
1045: break;
1.57 markus 1046: case 'd':
1047: if (d_flag)
1048: usage();
1049: d_flag++;
1050: break;
1.86 markus 1051: case 'a':
1052: agentsocket = optarg;
1.106 marc 1053: break;
1054: case 't':
1055: if ((lifetime = convtime(optarg)) == -1) {
1056: fprintf(stderr, "Invalid lifetime\n");
1057: usage();
1058: }
1.86 markus 1059: break;
1.21 markus 1060: default:
1061: usage();
1062: }
1063: }
1064: ac -= optind;
1065: av += optind;
1066:
1.57 markus 1067: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1068: usage();
1069:
1.85 markus 1070: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1071: shell = getenv("SHELL");
1.161 tobias 1072: if (shell != NULL && (len = strlen(shell)) > 2 &&
1073: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1074: c_flag = 1;
1075: }
1076: if (k_flag) {
1.136 deraadt 1077: const char *errstr = NULL;
1078:
1.21 markus 1079: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1080: if (pidstr == NULL) {
1081: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1082: SSH_AGENTPID_ENV_NAME);
1.21 markus 1083: exit(1);
1084: }
1.136 deraadt 1085: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1086: if (errstr) {
1087: fprintf(stderr,
1088: "%s=\"%s\", which is not a good PID: %s\n",
1089: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1090: exit(1);
1091: }
1092: if (kill(pid, SIGTERM) == -1) {
1093: perror("kill");
1094: exit(1);
1095: }
1096: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1097: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1098: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1099: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1100: exit(0);
1101: }
1102: parent_pid = getpid();
1103:
1.86 markus 1104: if (agentsocket == NULL) {
1105: /* Create private directory for agent socket */
1.171 djm 1106: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1107: if (mkdtemp(socket_dir) == NULL) {
1108: perror("mkdtemp: private socket dir");
1109: exit(1);
1110: }
1.91 mpech 1111: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1112: (long)parent_pid);
1.86 markus 1113: } else {
1114: /* Try to use specified agent socket */
1115: socket_dir[0] = '\0';
1116: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1117: }
1118:
1.23 markus 1119: /*
1120: * Create socket early so it will exist before command gets run from
1121: * the parent.
1122: */
1.21 markus 1123: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1124: if (sock < 0) {
1125: perror("socket");
1.121 djm 1126: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1127: cleanup_exit(1);
1128: }
1129: memset(&sunaddr, 0, sizeof(sunaddr));
1130: sunaddr.sun_family = AF_UNIX;
1131: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1132: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1133: perror("bind");
1.121 djm 1134: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1135: cleanup_exit(1);
1136: }
1.117 markus 1137: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1138: perror("listen");
1139: cleanup_exit(1);
1140: }
1.46 markus 1141:
1.23 markus 1142: /*
1143: * Fork, and have the parent execute the command, if any, or present
1144: * the socket data. The child continues as the authentication agent.
1145: */
1.57 markus 1146: if (d_flag) {
1147: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1148: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1149: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1150: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1151: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1152: goto skip;
1153: }
1.21 markus 1154: pid = fork();
1155: if (pid == -1) {
1156: perror("fork");
1.81 stevesk 1157: cleanup_exit(1);
1.21 markus 1158: }
1159: if (pid != 0) { /* Parent - execute the given command. */
1160: close(sock);
1.91 mpech 1161: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1162: if (ac == 0) {
1163: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1164: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1165: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1166: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1167: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1168: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1169: exit(0);
1170: }
1.36 deraadt 1171: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1172: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1173: perror("setenv");
1174: exit(1);
1175: }
1.21 markus 1176: execvp(av[0], av);
1177: perror(av[0]);
1178: exit(1);
1179: }
1.81 stevesk 1180: /* child */
1181: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1182:
1183: if (setsid() == -1) {
1.81 stevesk 1184: error("setsid: %s", strerror(errno));
1.67 stevesk 1185: cleanup_exit(1);
1186: }
1187:
1188: (void)chdir("/");
1.107 markus 1189: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1190: /* XXX might close listen socket */
1191: (void)dup2(fd, STDIN_FILENO);
1192: (void)dup2(fd, STDOUT_FILENO);
1193: (void)dup2(fd, STDERR_FILENO);
1194: if (fd > 2)
1195: close(fd);
1196: }
1.21 markus 1197:
1.41 markus 1198: /* deny core dumps, since memory contains unencrypted private keys */
1199: rlim.rlim_cur = rlim.rlim_max = 0;
1200: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1201: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1202: cleanup_exit(1);
1203: }
1.57 markus 1204:
1205: skip:
1.163 markus 1206:
1207: #ifdef ENABLE_PKCS11
1208: pkcs11_init(0);
1209: #endif
1.21 markus 1210: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1211: if (ac > 0)
1212: parent_alive_interval = 10;
1.33 markus 1213: idtab_init();
1.61 markus 1214: signal(SIGPIPE, SIG_IGN);
1.177 djm 1215: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1216: signal(SIGHUP, cleanup_handler);
1217: signal(SIGTERM, cleanup_handler);
1.66 markus 1218: nalloc = 0;
1219:
1.21 markus 1220: while (1) {
1.155 dtucker 1221: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1222: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1223: saved_errno = errno;
1.155 dtucker 1224: if (parent_alive_interval != 0)
1225: check_parent_exists();
1226: (void) reaper(); /* remove expired keys */
1.154 dtucker 1227: if (result < 0) {
1228: if (saved_errno == EINTR)
1.21 markus 1229: continue;
1.154 dtucker 1230: fatal("select: %s", strerror(saved_errno));
1231: } else if (result > 0)
1232: after_select(readsetp, writesetp);
1.15 markus 1233: }
1.21 markus 1234: /* NOTREACHED */
1.1 deraadt 1235: }
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