Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.184
1.184 ! deraadt 1: /* $OpenBSD: ssh-agent.c,v 1.183 2014/02/02 03:44:31 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>
1.128 stevesk 43: #include <sys/un.h>
1.148 stevesk 44: #include <sys/param.h>
1.126 stevesk 45:
1.146 stevesk 46: #include <openssl/evp.h>
47:
1.143 stevesk 48: #include <errno.h>
1.142 stevesk 49: #include <fcntl.h>
1.126 stevesk 50: #include <paths.h>
1.129 stevesk 51: #include <signal.h>
1.149 stevesk 52: #include <stdlib.h>
1.150 stevesk 53: #include <stdio.h>
1.146 stevesk 54: #include <string.h>
1.145 stevesk 55: #include <time.h>
1.144 stevesk 56: #include <unistd.h>
1.1 deraadt 57:
1.151 deraadt 58: #include "xmalloc.h"
1.1 deraadt 59: #include "ssh.h"
60: #include "rsa.h"
61: #include "buffer.h"
1.32 markus 62: #include "key.h"
63: #include "authfd.h"
1.37 markus 64: #include "compat.h"
1.47 markus 65: #include "log.h"
1.107 markus 66: #include "misc.h"
1.182 markus 67: #include "digest.h"
1.7 deraadt 68:
1.163 markus 69: #ifdef ENABLE_PKCS11
70: #include "ssh-pkcs11.h"
1.71 jakob 71: #endif
1.59 markus 72:
1.73 stevesk 73: typedef enum {
74: AUTH_UNUSED,
75: AUTH_SOCKET,
76: AUTH_CONNECTION
77: } sock_type;
78:
1.21 markus 79: typedef struct {
80: int fd;
1.73 stevesk 81: sock_type type;
1.21 markus 82: Buffer input;
83: Buffer output;
1.87 markus 84: Buffer request;
1.1 deraadt 85: } SocketEntry;
86:
1.45 markus 87: u_int sockets_alloc = 0;
1.1 deraadt 88: SocketEntry *sockets = NULL;
89:
1.78 provos 90: typedef struct identity {
91: TAILQ_ENTRY(identity) next;
1.33 markus 92: Key *key;
1.21 markus 93: char *comment;
1.163 markus 94: char *provider;
1.174 dtucker 95: time_t death;
1.107 markus 96: u_int confirm;
1.1 deraadt 97: } Identity;
98:
1.33 markus 99: typedef struct {
100: int nentries;
1.78 provos 101: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 102: } Idtab;
103:
104: /* private key table, one per protocol version */
105: Idtab idtable[3];
1.1 deraadt 106:
107: int max_fd = 0;
108:
1.11 markus 109: /* pid of shell == parent of agent */
1.29 deraadt 110: pid_t parent_pid = -1;
1.176 dtucker 111: time_t parent_alive_interval = 0;
1.10 markus 112:
113: /* pathname and directory for AUTH_SOCKET */
1.132 djm 114: char socket_name[MAXPATHLEN];
115: char socket_dir[MAXPATHLEN];
1.10 markus 116:
1.88 markus 117: /* locking */
118: int locked = 0;
119: char *lock_passwd = NULL;
120:
1.20 markus 121: extern char *__progname;
122:
1.174 dtucker 123: /* Default lifetime in seconds (0 == forever) */
124: static long lifetime = 0;
1.106 marc 125:
1.55 itojun 126: static void
1.101 stevesk 127: close_socket(SocketEntry *e)
128: {
129: close(e->fd);
130: e->fd = -1;
131: e->type = AUTH_UNUSED;
132: buffer_free(&e->input);
133: buffer_free(&e->output);
134: buffer_free(&e->request);
135: }
136:
137: static void
1.33 markus 138: idtab_init(void)
1.1 deraadt 139: {
1.33 markus 140: int i;
1.96 deraadt 141:
1.74 deraadt 142: for (i = 0; i <=2; i++) {
1.78 provos 143: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 144: idtable[i].nentries = 0;
145: }
146: }
147:
148: /* return private key table for requested protocol version */
1.55 itojun 149: static Idtab *
1.33 markus 150: idtab_lookup(int version)
151: {
152: if (version < 1 || version > 2)
153: fatal("internal error, bad protocol version %d", version);
154: return &idtable[version];
155: }
156:
1.89 markus 157: static void
158: free_identity(Identity *id)
159: {
160: key_free(id->key);
1.173 djm 161: free(id->provider);
162: free(id->comment);
163: free(id);
1.89 markus 164: }
165:
1.33 markus 166: /* return matching private key for given public key */
1.78 provos 167: static Identity *
168: lookup_identity(Key *key, int version)
1.33 markus 169: {
1.78 provos 170: Identity *id;
171:
1.33 markus 172: Idtab *tab = idtab_lookup(version);
1.78 provos 173: TAILQ_FOREACH(id, &tab->idlist, next) {
174: if (key_equal(key, id->key))
175: return (id);
1.33 markus 176: }
1.78 provos 177: return (NULL);
178: }
179:
1.107 markus 180: /* Check confirmation of keysign request */
181: static int
182: confirm_key(Identity *id)
183: {
1.122 djm 184: char *p;
1.107 markus 185: int ret = -1;
186:
187: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 188: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
189: id->comment, p))
190: ret = 0;
1.173 djm 191: free(p);
1.122 djm 192:
1.107 markus 193: return (ret);
194: }
195:
1.33 markus 196: /* send list of supported public keys to 'client' */
1.55 itojun 197: static void
1.33 markus 198: process_request_identities(SocketEntry *e, int version)
199: {
200: Idtab *tab = idtab_lookup(version);
1.96 deraadt 201: Identity *id;
1.21 markus 202: Buffer msg;
1.1 deraadt 203:
1.21 markus 204: buffer_init(&msg);
1.33 markus 205: buffer_put_char(&msg, (version == 1) ?
206: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
207: buffer_put_int(&msg, tab->nentries);
1.78 provos 208: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 209: if (id->key->type == KEY_RSA1) {
1.33 markus 210: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
211: buffer_put_bignum(&msg, id->key->rsa->e);
212: buffer_put_bignum(&msg, id->key->rsa->n);
213: } else {
1.45 markus 214: u_char *blob;
215: u_int blen;
1.39 markus 216: key_to_blob(id->key, &blob, &blen);
1.33 markus 217: buffer_put_string(&msg, blob, blen);
1.173 djm 218: free(blob);
1.33 markus 219: }
220: buffer_put_cstring(&msg, id->comment);
1.21 markus 221: }
222: buffer_put_int(&e->output, buffer_len(&msg));
223: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
224: buffer_free(&msg);
1.1 deraadt 225: }
226:
1.33 markus 227: /* ssh1 only */
1.55 itojun 228: static void
1.33 markus 229: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 230: {
1.96 deraadt 231: u_char buf[32], mdbuf[16], session_id[16];
232: u_int response_type;
233: BIGNUM *challenge;
1.78 provos 234: Identity *id;
1.33 markus 235: int i, len;
1.21 markus 236: Buffer msg;
1.182 markus 237: struct ssh_digest_ctx *md;
1.96 deraadt 238: Key *key;
1.21 markus 239:
240: buffer_init(&msg);
1.39 markus 241: key = key_new(KEY_RSA1);
1.76 markus 242: if ((challenge = BN_new()) == NULL)
243: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 244:
1.97 markus 245: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 246: buffer_get_bignum(&e->request, key->rsa->e);
247: buffer_get_bignum(&e->request, key->rsa->n);
248: buffer_get_bignum(&e->request, challenge);
1.21 markus 249:
1.33 markus 250: /* Only protocol 1.1 is supported */
1.87 markus 251: if (buffer_len(&e->request) == 0)
1.33 markus 252: goto failure;
1.87 markus 253: buffer_get(&e->request, session_id, 16);
254: response_type = buffer_get_int(&e->request);
1.33 markus 255: if (response_type != 1)
256: goto failure;
257:
1.78 provos 258: id = lookup_identity(key, 1);
1.107 markus 259: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 260: Key *private = id->key;
1.33 markus 261: /* Decrypt the challenge using the private key. */
1.49 markus 262: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
263: goto failure;
1.33 markus 264:
265: /* The response is MD5 of decrypted challenge plus session id. */
266: len = BN_num_bytes(challenge);
267: if (len <= 0 || len > 32) {
1.109 itojun 268: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 269: goto failure;
270: }
271: memset(buf, 0, 32);
272: BN_bn2bin(challenge, buf + 32 - len);
1.182 markus 273: if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
274: ssh_digest_update(md, buf, 32) < 0 ||
275: ssh_digest_update(md, session_id, 16) < 0 ||
276: ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
277: fatal("%s: md5 failed", __func__);
278: ssh_digest_free(md);
1.33 markus 279:
280: /* Send the response. */
281: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
282: for (i = 0; i < 16; i++)
283: buffer_put_char(&msg, mdbuf[i]);
284: goto send;
285: }
1.21 markus 286:
1.33 markus 287: failure:
288: /* Unknown identity or protocol error. Send failure. */
1.21 markus 289: buffer_put_char(&msg, SSH_AGENT_FAILURE);
290: send:
291: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 292: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
293: key_free(key);
294: BN_clear_free(challenge);
295: buffer_free(&msg);
296: }
297:
298: /* ssh2 only */
1.55 itojun 299: static void
1.33 markus 300: process_sign_request2(SocketEntry *e)
301: {
1.45 markus 302: u_char *blob, *data, *signature = NULL;
303: u_int blen, dlen, slen = 0;
1.96 deraadt 304: extern int datafellows;
1.159 djm 305: int odatafellows;
1.96 deraadt 306: int ok = -1, flags;
1.33 markus 307: Buffer msg;
1.96 deraadt 308: Key *key;
1.33 markus 309:
310: datafellows = 0;
1.43 markus 311:
1.87 markus 312: blob = buffer_get_string(&e->request, &blen);
313: data = buffer_get_string(&e->request, &dlen);
1.37 markus 314:
1.87 markus 315: flags = buffer_get_int(&e->request);
1.159 djm 316: odatafellows = datafellows;
1.37 markus 317: if (flags & SSH_AGENT_OLD_SIGNATURE)
318: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 319:
1.39 markus 320: key = key_from_blob(blob, blen);
1.33 markus 321: if (key != NULL) {
1.78 provos 322: Identity *id = lookup_identity(key, 2);
1.107 markus 323: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 324: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 325: key_free(key);
1.33 markus 326: }
327: buffer_init(&msg);
328: if (ok == 0) {
329: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
330: buffer_put_string(&msg, signature, slen);
331: } else {
332: buffer_put_char(&msg, SSH_AGENT_FAILURE);
333: }
334: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 335: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 336: buffer_len(&msg));
1.21 markus 337: buffer_free(&msg);
1.173 djm 338: free(data);
339: free(blob);
340: free(signature);
1.159 djm 341: datafellows = odatafellows;
1.1 deraadt 342: }
343:
1.33 markus 344: /* shared */
1.55 itojun 345: static void
1.33 markus 346: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 347: {
1.96 deraadt 348: u_int blen, bits;
349: int success = 0;
1.78 provos 350: Key *key = NULL;
1.45 markus 351: u_char *blob;
1.21 markus 352:
1.74 deraadt 353: switch (version) {
1.33 markus 354: case 1:
1.39 markus 355: key = key_new(KEY_RSA1);
1.87 markus 356: bits = buffer_get_int(&e->request);
357: buffer_get_bignum(&e->request, key->rsa->e);
358: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 359:
360: if (bits != key_size(key))
1.109 itojun 361: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 362: key_size(key), bits);
1.33 markus 363: break;
364: case 2:
1.87 markus 365: blob = buffer_get_string(&e->request, &blen);
1.39 markus 366: key = key_from_blob(blob, blen);
1.173 djm 367: free(blob);
1.33 markus 368: break;
369: }
370: if (key != NULL) {
1.78 provos 371: Identity *id = lookup_identity(key, version);
372: if (id != NULL) {
1.23 markus 373: /*
374: * We have this key. Free the old key. Since we
1.124 djm 375: * don't want to leave empty slots in the middle of
1.40 markus 376: * the array, we actually free the key there and move
377: * all the entries between the empty slot and the end
378: * of the array.
1.23 markus 379: */
1.33 markus 380: Idtab *tab = idtab_lookup(version);
1.38 markus 381: if (tab->nentries < 1)
382: fatal("process_remove_identity: "
383: "internal error: tab->nentries %d",
384: tab->nentries);
1.78 provos 385: TAILQ_REMOVE(&tab->idlist, id, next);
386: free_identity(id);
1.33 markus 387: tab->nentries--;
388: success = 1;
1.21 markus 389: }
1.33 markus 390: key_free(key);
391: }
1.1 deraadt 392: buffer_put_int(&e->output, 1);
1.33 markus 393: buffer_put_char(&e->output,
394: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 395: }
396:
1.55 itojun 397: static void
1.33 markus 398: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 399: {
1.33 markus 400: Idtab *tab = idtab_lookup(version);
1.78 provos 401: Identity *id;
1.21 markus 402:
403: /* Loop over all identities and clear the keys. */
1.78 provos 404: for (id = TAILQ_FIRST(&tab->idlist); id;
405: id = TAILQ_FIRST(&tab->idlist)) {
406: TAILQ_REMOVE(&tab->idlist, id, next);
407: free_identity(id);
1.21 markus 408: }
409:
410: /* Mark that there are no identities. */
1.33 markus 411: tab->nentries = 0;
1.21 markus 412:
413: /* Send success. */
414: buffer_put_int(&e->output, 1);
415: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 416: }
417:
1.155 dtucker 418: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 419: static time_t
1.89 markus 420: reaper(void)
421: {
1.175 dtucker 422: time_t deadline = 0, now = monotime();
1.89 markus 423: Identity *id, *nxt;
424: int version;
1.96 deraadt 425: Idtab *tab;
1.89 markus 426:
427: for (version = 1; version < 3; version++) {
428: tab = idtab_lookup(version);
429: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
430: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 431: if (id->death == 0)
432: continue;
433: if (now >= id->death) {
1.154 dtucker 434: debug("expiring key '%s'", id->comment);
1.89 markus 435: TAILQ_REMOVE(&tab->idlist, id, next);
436: free_identity(id);
437: tab->nentries--;
1.155 dtucker 438: } else
439: deadline = (deadline == 0) ? id->death :
440: MIN(deadline, id->death);
1.89 markus 441: }
442: }
1.155 dtucker 443: if (deadline == 0 || deadline <= now)
444: return 0;
445: else
446: return (deadline - now);
1.89 markus 447: }
448:
449: static void
1.33 markus 450: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 451: {
1.96 deraadt 452: Idtab *tab = idtab_lookup(version);
1.157 canacar 453: Identity *id;
1.174 dtucker 454: int type, success = 0, confirm = 0;
1.178 markus 455: char *comment;
1.174 dtucker 456: time_t death = 0;
1.33 markus 457: Key *k = NULL;
458:
459: switch (version) {
460: case 1:
1.39 markus 461: k = key_new_private(KEY_RSA1);
1.97 markus 462: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 463: buffer_get_bignum(&e->request, k->rsa->n);
464: buffer_get_bignum(&e->request, k->rsa->e);
465: buffer_get_bignum(&e->request, k->rsa->d);
466: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 467:
468: /* SSH and SSL have p and q swapped */
1.87 markus 469: buffer_get_bignum(&e->request, k->rsa->q); /* p */
470: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 471:
472: /* Generate additional parameters */
1.60 markus 473: rsa_generate_additional_parameters(k->rsa);
1.178 markus 474:
1.180 markus 475: /* enable blinding */
1.178 markus 476: if (RSA_blinding_on(k->rsa, NULL) != 1) {
477: error("process_add_identity: RSA_blinding_on failed");
478: key_free(k);
479: goto send;
480: }
1.33 markus 481: break;
482: case 2:
1.178 markus 483: k = key_private_deserialize(&e->request);
484: if (k == NULL) {
1.87 markus 485: buffer_clear(&e->request);
1.33 markus 486: goto send;
1.21 markus 487: }
1.33 markus 488: break;
489: }
1.87 markus 490: comment = buffer_get_string(&e->request, NULL);
1.33 markus 491: if (k == NULL) {
1.173 djm 492: free(comment);
1.33 markus 493: goto send;
494: }
1.94 markus 495: while (buffer_len(&e->request)) {
1.158 djm 496: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 497: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 498: death = monotime() + buffer_get_int(&e->request);
1.94 markus 499: break;
1.107 markus 500: case SSH_AGENT_CONSTRAIN_CONFIRM:
501: confirm = 1;
502: break;
1.94 markus 503: default:
1.158 djm 504: error("process_add_identity: "
505: "Unknown constraint type %d", type);
1.173 djm 506: free(comment);
1.158 djm 507: key_free(k);
508: goto send;
1.94 markus 509: }
510: }
1.158 djm 511: success = 1;
1.106 marc 512: if (lifetime && !death)
1.175 dtucker 513: death = monotime() + lifetime;
1.157 canacar 514: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 515: id = xcalloc(1, sizeof(Identity));
1.78 provos 516: id->key = k;
517: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 518: /* Increment the number of identities. */
519: tab->nentries++;
520: } else {
521: key_free(k);
1.173 djm 522: free(id->comment);
1.33 markus 523: }
1.157 canacar 524: id->comment = comment;
525: id->death = death;
526: id->confirm = confirm;
1.33 markus 527: send:
1.1 deraadt 528: buffer_put_int(&e->output, 1);
1.33 markus 529: buffer_put_char(&e->output,
530: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 531: }
532:
1.88 markus 533: /* XXX todo: encrypt sensitive data with passphrase */
534: static void
535: process_lock_agent(SocketEntry *e, int lock)
536: {
1.96 deraadt 537: int success = 0;
1.88 markus 538: char *passwd;
539:
540: passwd = buffer_get_string(&e->request, NULL);
541: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
542: locked = 0;
1.183 djm 543: explicit_bzero(lock_passwd, strlen(lock_passwd));
1.173 djm 544: free(lock_passwd);
1.88 markus 545: lock_passwd = NULL;
546: success = 1;
547: } else if (!locked && lock) {
548: locked = 1;
549: lock_passwd = xstrdup(passwd);
550: success = 1;
551: }
1.183 djm 552: explicit_bzero(passwd, strlen(passwd));
1.173 djm 553: free(passwd);
1.95 deraadt 554:
1.88 markus 555: buffer_put_int(&e->output, 1);
556: buffer_put_char(&e->output,
557: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
558: }
559:
560: static void
561: no_identities(SocketEntry *e, u_int type)
562: {
563: Buffer msg;
564:
565: buffer_init(&msg);
566: buffer_put_char(&msg,
567: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
568: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
569: buffer_put_int(&msg, 0);
570: buffer_put_int(&e->output, buffer_len(&msg));
571: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
572: buffer_free(&msg);
573: }
1.59 markus 574:
1.163 markus 575: #ifdef ENABLE_PKCS11
1.59 markus 576: static void
1.158 djm 577: process_add_smartcard_key(SocketEntry *e)
1.59 markus 578: {
1.163 markus 579: char *provider = NULL, *pin;
1.174 dtucker 580: int i, type, version, count = 0, success = 0, confirm = 0;
581: time_t death = 0;
1.163 markus 582: Key **keys = NULL, *k;
1.84 markus 583: Identity *id;
1.59 markus 584: Idtab *tab;
1.75 deraadt 585:
1.163 markus 586: provider = buffer_get_string(&e->request, NULL);
1.87 markus 587: pin = buffer_get_string(&e->request, NULL);
1.110 djm 588:
589: while (buffer_len(&e->request)) {
1.158 djm 590: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 591: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 592: death = monotime() + buffer_get_int(&e->request);
1.110 djm 593: break;
594: case SSH_AGENT_CONSTRAIN_CONFIRM:
595: confirm = 1;
596: break;
597: default:
1.158 djm 598: error("process_add_smartcard_key: "
599: "Unknown constraint type %d", type);
600: goto send;
1.110 djm 601: }
602: }
603: if (lifetime && !death)
1.175 dtucker 604: death = monotime() + lifetime;
1.110 djm 605:
1.163 markus 606: count = pkcs11_add_provider(provider, pin, &keys);
607: for (i = 0; i < count; i++) {
1.84 markus 608: k = keys[i];
609: version = k->type == KEY_RSA1 ? 1 : 2;
610: tab = idtab_lookup(version);
611: if (lookup_identity(k, version) == NULL) {
1.163 markus 612: id = xcalloc(1, sizeof(Identity));
1.84 markus 613: id->key = k;
1.163 markus 614: id->provider = xstrdup(provider);
615: id->comment = xstrdup(provider); /* XXX */
1.110 djm 616: id->death = death;
617: id->confirm = confirm;
1.84 markus 618: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
619: tab->nentries++;
620: success = 1;
621: } else {
622: key_free(k);
623: }
624: keys[i] = NULL;
1.59 markus 625: }
626: send:
1.173 djm 627: free(pin);
628: free(provider);
629: free(keys);
1.59 markus 630: buffer_put_int(&e->output, 1);
631: buffer_put_char(&e->output,
632: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
633: }
634:
635: static void
636: process_remove_smartcard_key(SocketEntry *e)
637: {
1.163 markus 638: char *provider = NULL, *pin = NULL;
639: int version, success = 0;
640: Identity *id, *nxt;
1.84 markus 641: Idtab *tab;
1.59 markus 642:
1.163 markus 643: provider = buffer_get_string(&e->request, NULL);
1.87 markus 644: pin = buffer_get_string(&e->request, NULL);
1.173 djm 645: free(pin);
1.59 markus 646:
1.163 markus 647: for (version = 1; version < 3; version++) {
648: tab = idtab_lookup(version);
649: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
650: nxt = TAILQ_NEXT(id, next);
1.181 djm 651: /* Skip file--based keys */
652: if (id->provider == NULL)
653: continue;
1.163 markus 654: if (!strcmp(provider, id->provider)) {
655: TAILQ_REMOVE(&tab->idlist, id, next);
656: free_identity(id);
657: tab->nentries--;
658: }
1.59 markus 659: }
660: }
1.163 markus 661: if (pkcs11_del_provider(provider) == 0)
662: success = 1;
663: else
664: error("process_remove_smartcard_key:"
665: " pkcs11_del_provider failed");
1.173 djm 666: free(provider);
1.59 markus 667: buffer_put_int(&e->output, 1);
668: buffer_put_char(&e->output,
669: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
670: }
1.163 markus 671: #endif /* ENABLE_PKCS11 */
1.59 markus 672:
1.33 markus 673: /* dispatch incoming messages */
674:
1.55 itojun 675: static void
1.2 provos 676: process_message(SocketEntry *e)
1.1 deraadt 677: {
1.96 deraadt 678: u_int msg_len, type;
1.45 markus 679: u_char *cp;
1.89 markus 680:
1.21 markus 681: if (buffer_len(&e->input) < 5)
682: return; /* Incomplete message. */
1.77 stevesk 683: cp = buffer_ptr(&e->input);
1.137 djm 684: msg_len = get_u32(cp);
1.21 markus 685: if (msg_len > 256 * 1024) {
1.101 stevesk 686: close_socket(e);
1.21 markus 687: return;
688: }
689: if (buffer_len(&e->input) < msg_len + 4)
690: return;
1.87 markus 691:
692: /* move the current input to e->request */
1.21 markus 693: buffer_consume(&e->input, 4);
1.87 markus 694: buffer_clear(&e->request);
695: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
696: buffer_consume(&e->input, msg_len);
697: type = buffer_get_char(&e->request);
1.21 markus 698:
1.88 markus 699: /* check wheter agent is locked */
700: if (locked && type != SSH_AGENTC_UNLOCK) {
701: buffer_clear(&e->request);
702: switch (type) {
703: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
704: case SSH2_AGENTC_REQUEST_IDENTITIES:
705: /* send empty lists */
706: no_identities(e, type);
707: break;
708: default:
709: /* send a fail message for all other request types */
710: buffer_put_int(&e->output, 1);
711: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
712: }
713: return;
714: }
715:
1.59 markus 716: debug("type %d", type);
1.21 markus 717: switch (type) {
1.88 markus 718: case SSH_AGENTC_LOCK:
719: case SSH_AGENTC_UNLOCK:
720: process_lock_agent(e, type == SSH_AGENTC_LOCK);
721: break;
1.33 markus 722: /* ssh1 */
723: case SSH_AGENTC_RSA_CHALLENGE:
724: process_authentication_challenge1(e);
725: break;
1.21 markus 726: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 727: process_request_identities(e, 1);
1.21 markus 728: break;
729: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 730: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 731: process_add_identity(e, 1);
1.21 markus 732: break;
733: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 734: process_remove_identity(e, 1);
1.21 markus 735: break;
736: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 737: process_remove_all_identities(e, 1);
738: break;
739: /* ssh2 */
740: case SSH2_AGENTC_SIGN_REQUEST:
741: process_sign_request2(e);
742: break;
743: case SSH2_AGENTC_REQUEST_IDENTITIES:
744: process_request_identities(e, 2);
745: break;
746: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 747: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 748: process_add_identity(e, 2);
749: break;
750: case SSH2_AGENTC_REMOVE_IDENTITY:
751: process_remove_identity(e, 2);
752: break;
753: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
754: process_remove_all_identities(e, 2);
1.21 markus 755: break;
1.163 markus 756: #ifdef ENABLE_PKCS11
1.59 markus 757: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 758: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 759: process_add_smartcard_key(e);
1.75 deraadt 760: break;
1.59 markus 761: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
762: process_remove_smartcard_key(e);
1.75 deraadt 763: break;
1.163 markus 764: #endif /* ENABLE_PKCS11 */
1.21 markus 765: default:
766: /* Unknown message. Respond with failure. */
767: error("Unknown message %d", type);
1.87 markus 768: buffer_clear(&e->request);
1.21 markus 769: buffer_put_int(&e->output, 1);
770: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
771: break;
772: }
1.1 deraadt 773: }
774:
1.55 itojun 775: static void
1.73 stevesk 776: new_socket(sock_type type, int fd)
1.1 deraadt 777: {
1.112 markus 778: u_int i, old_alloc, new_alloc;
1.96 deraadt 779:
1.119 djm 780: set_nonblock(fd);
1.21 markus 781:
782: if (fd > max_fd)
783: max_fd = fd;
784:
785: for (i = 0; i < sockets_alloc; i++)
786: if (sockets[i].type == AUTH_UNUSED) {
787: sockets[i].fd = fd;
788: buffer_init(&sockets[i].input);
789: buffer_init(&sockets[i].output);
1.87 markus 790: buffer_init(&sockets[i].request);
1.112 markus 791: sockets[i].type = type;
1.21 markus 792: return;
793: }
794: old_alloc = sockets_alloc;
1.112 markus 795: new_alloc = sockets_alloc + 10;
1.133 djm 796: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 797: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 798: sockets[i].type = AUTH_UNUSED;
1.112 markus 799: sockets_alloc = new_alloc;
1.21 markus 800: sockets[old_alloc].fd = fd;
801: buffer_init(&sockets[old_alloc].input);
802: buffer_init(&sockets[old_alloc].output);
1.87 markus 803: buffer_init(&sockets[old_alloc].request);
1.112 markus 804: sockets[old_alloc].type = type;
1.1 deraadt 805: }
806:
1.55 itojun 807: static int
1.155 dtucker 808: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
809: struct timeval **tvpp)
1.1 deraadt 810: {
1.174 dtucker 811: u_int i, sz;
1.46 markus 812: int n = 0;
1.155 dtucker 813: static struct timeval tv;
1.174 dtucker 814: time_t deadline;
1.46 markus 815:
816: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 817: switch (sockets[i].type) {
818: case AUTH_SOCKET:
819: case AUTH_CONNECTION:
1.46 markus 820: n = MAX(n, sockets[i].fd);
1.21 markus 821: break;
822: case AUTH_UNUSED:
823: break;
824: default:
825: fatal("Unknown socket type %d", sockets[i].type);
826: break;
827: }
1.46 markus 828: }
829:
830: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 831: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 832: free(*fdrp);
833: free(*fdwp);
1.46 markus 834: *fdrp = xmalloc(sz);
835: *fdwp = xmalloc(sz);
1.66 markus 836: *nallocp = sz;
1.46 markus 837: }
1.66 markus 838: if (n < *fdl)
839: debug("XXX shrink: %d < %d", n, *fdl);
840: *fdl = n;
1.46 markus 841: memset(*fdrp, 0, sz);
842: memset(*fdwp, 0, sz);
843:
844: for (i = 0; i < sockets_alloc; i++) {
845: switch (sockets[i].type) {
846: case AUTH_SOCKET:
847: case AUTH_CONNECTION:
848: FD_SET(sockets[i].fd, *fdrp);
849: if (buffer_len(&sockets[i].output) > 0)
850: FD_SET(sockets[i].fd, *fdwp);
851: break;
852: default:
853: break;
854: }
855: }
1.155 dtucker 856: deadline = reaper();
857: if (parent_alive_interval != 0)
858: deadline = (deadline == 0) ? parent_alive_interval :
859: MIN(deadline, parent_alive_interval);
860: if (deadline == 0) {
861: *tvpp = NULL;
862: } else {
863: tv.tv_sec = deadline;
864: tv.tv_usec = 0;
865: *tvpp = &tv;
866: }
1.46 markus 867: return (1);
1.21 markus 868: }
869:
1.55 itojun 870: static void
1.21 markus 871: after_select(fd_set *readset, fd_set *writeset)
872: {
1.96 deraadt 873: struct sockaddr_un sunaddr;
1.26 markus 874: socklen_t slen;
1.21 markus 875: char buf[1024];
1.96 deraadt 876: int len, sock;
1.162 djm 877: u_int i, orig_alloc;
1.103 markus 878: uid_t euid;
879: gid_t egid;
1.21 markus 880:
1.162 djm 881: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 882: switch (sockets[i].type) {
883: case AUTH_UNUSED:
884: break;
885: case AUTH_SOCKET:
886: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 887: slen = sizeof(sunaddr);
1.46 markus 888: sock = accept(sockets[i].fd,
1.131 deraadt 889: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 890: if (sock < 0) {
1.81 stevesk 891: error("accept from AUTH_SOCKET: %s",
892: strerror(errno));
1.103 markus 893: break;
894: }
895: if (getpeereid(sock, &euid, &egid) < 0) {
896: error("getpeereid %d failed: %s",
897: sock, strerror(errno));
898: close(sock);
899: break;
900: }
1.105 markus 901: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 902: error("uid mismatch: "
1.104 stevesk 903: "peer euid %u != uid %u",
904: (u_int) euid, (u_int) getuid());
1.103 markus 905: close(sock);
1.21 markus 906: break;
907: }
908: new_socket(AUTH_CONNECTION, sock);
909: }
910: break;
911: case AUTH_CONNECTION:
912: if (buffer_len(&sockets[i].output) > 0 &&
913: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 914: len = write(sockets[i].fd,
915: buffer_ptr(&sockets[i].output),
916: buffer_len(&sockets[i].output));
917: if (len == -1 && (errno == EAGAIN ||
918: errno == EINTR))
919: continue;
1.21 markus 920: if (len <= 0) {
1.101 stevesk 921: close_socket(&sockets[i]);
1.21 markus 922: break;
923: }
924: buffer_consume(&sockets[i].output, len);
925: }
926: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 927: len = read(sockets[i].fd, buf, sizeof(buf));
928: if (len == -1 && (errno == EAGAIN ||
929: errno == EINTR))
930: continue;
1.21 markus 931: if (len <= 0) {
1.101 stevesk 932: close_socket(&sockets[i]);
1.21 markus 933: break;
934: }
935: buffer_append(&sockets[i].input, buf, len);
936: process_message(&sockets[i]);
937: }
938: break;
939: default:
940: fatal("Unknown type %d", sockets[i].type);
941: }
1.1 deraadt 942: }
943:
1.55 itojun 944: static void
1.113 markus 945: cleanup_socket(void)
1.15 markus 946: {
1.48 deraadt 947: if (socket_name[0])
948: unlink(socket_name);
949: if (socket_dir[0])
950: rmdir(socket_dir);
1.10 markus 951: }
952:
1.114 markus 953: void
1.15 markus 954: cleanup_exit(int i)
955: {
1.113 markus 956: cleanup_socket();
957: _exit(i);
1.15 markus 958: }
959:
1.135 deraadt 960: /*ARGSUSED*/
1.55 itojun 961: static void
1.48 deraadt 962: cleanup_handler(int sig)
963: {
1.113 markus 964: cleanup_socket();
1.163 markus 965: #ifdef ENABLE_PKCS11
966: pkcs11_terminate();
967: #endif
1.48 deraadt 968: _exit(2);
1.113 markus 969: }
970:
1.68 markus 971: static void
1.155 dtucker 972: check_parent_exists(void)
1.68 markus 973: {
1.172 dtucker 974: /*
975: * If our parent has exited then getppid() will return (pid_t)1,
976: * so testing for that should be safe.
977: */
978: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 979: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 980: cleanup_socket();
981: _exit(2);
1.68 markus 982: }
1.48 deraadt 983: }
984:
1.55 itojun 985: static void
1.50 itojun 986: usage(void)
1.15 markus 987: {
1.184 ! deraadt 988: fprintf(stderr,
! 989: "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-t life]\n"
! 990: " [command [arg ...]]\n"
! 991: " ssh-agent [-c | -s] -k\n");
1.21 markus 992: exit(1);
1.15 markus 993: }
994:
1.2 provos 995: int
996: main(int ac, char **av)
1.1 deraadt 997: {
1.107 markus 998: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 999: int sock, fd, ch, result, saved_errno;
1.120 avsm 1000: u_int nalloc;
1.96 deraadt 1001: char *shell, *format, *pidstr, *agentsocket = NULL;
1002: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1003: struct sockaddr_un sunaddr;
1.41 markus 1004: struct rlimit rlim;
1.96 deraadt 1005: extern int optind;
1.98 stevesk 1006: extern char *optarg;
1.21 markus 1007: pid_t pid;
1.96 deraadt 1008: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1009: struct timeval *tvp = NULL;
1.161 tobias 1010: size_t len;
1.123 djm 1011:
1012: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1013: sanitise_stdfd();
1.99 markus 1014:
1015: /* drop */
1016: setegid(getgid());
1017: setgid(getgid());
1.53 markus 1018:
1.170 djm 1019: OpenSSL_add_all_algorithms();
1.21 markus 1020:
1.106 marc 1021: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1022: switch (ch) {
1023: case 'c':
1024: if (s_flag)
1025: usage();
1026: c_flag++;
1027: break;
1028: case 'k':
1029: k_flag++;
1030: break;
1031: case 's':
1032: if (c_flag)
1033: usage();
1034: s_flag++;
1035: break;
1.57 markus 1036: case 'd':
1037: if (d_flag)
1038: usage();
1039: d_flag++;
1040: break;
1.86 markus 1041: case 'a':
1042: agentsocket = optarg;
1.106 marc 1043: break;
1044: case 't':
1045: if ((lifetime = convtime(optarg)) == -1) {
1046: fprintf(stderr, "Invalid lifetime\n");
1047: usage();
1048: }
1.86 markus 1049: break;
1.21 markus 1050: default:
1051: usage();
1052: }
1053: }
1054: ac -= optind;
1055: av += optind;
1056:
1.57 markus 1057: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1058: usage();
1059:
1.85 markus 1060: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1061: shell = getenv("SHELL");
1.161 tobias 1062: if (shell != NULL && (len = strlen(shell)) > 2 &&
1063: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1064: c_flag = 1;
1065: }
1066: if (k_flag) {
1.136 deraadt 1067: const char *errstr = NULL;
1068:
1.21 markus 1069: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1070: if (pidstr == NULL) {
1071: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1072: SSH_AGENTPID_ENV_NAME);
1.21 markus 1073: exit(1);
1074: }
1.136 deraadt 1075: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1076: if (errstr) {
1077: fprintf(stderr,
1078: "%s=\"%s\", which is not a good PID: %s\n",
1079: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1080: exit(1);
1081: }
1082: if (kill(pid, SIGTERM) == -1) {
1083: perror("kill");
1084: exit(1);
1085: }
1086: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1087: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1088: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1089: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1090: exit(0);
1091: }
1092: parent_pid = getpid();
1093:
1.86 markus 1094: if (agentsocket == NULL) {
1095: /* Create private directory for agent socket */
1.171 djm 1096: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1097: if (mkdtemp(socket_dir) == NULL) {
1098: perror("mkdtemp: private socket dir");
1099: exit(1);
1100: }
1.91 mpech 1101: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1102: (long)parent_pid);
1.86 markus 1103: } else {
1104: /* Try to use specified agent socket */
1105: socket_dir[0] = '\0';
1106: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1107: }
1108:
1.23 markus 1109: /*
1110: * Create socket early so it will exist before command gets run from
1111: * the parent.
1112: */
1.21 markus 1113: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1114: if (sock < 0) {
1115: perror("socket");
1.121 djm 1116: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1117: cleanup_exit(1);
1118: }
1119: memset(&sunaddr, 0, sizeof(sunaddr));
1120: sunaddr.sun_family = AF_UNIX;
1121: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1122: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1123: perror("bind");
1.121 djm 1124: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1125: cleanup_exit(1);
1126: }
1.117 markus 1127: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1128: perror("listen");
1129: cleanup_exit(1);
1130: }
1.46 markus 1131:
1.23 markus 1132: /*
1133: * Fork, and have the parent execute the command, if any, or present
1134: * the socket data. The child continues as the authentication agent.
1135: */
1.57 markus 1136: if (d_flag) {
1137: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1138: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1139: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1140: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1141: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1142: goto skip;
1143: }
1.21 markus 1144: pid = fork();
1145: if (pid == -1) {
1146: perror("fork");
1.81 stevesk 1147: cleanup_exit(1);
1.21 markus 1148: }
1149: if (pid != 0) { /* Parent - execute the given command. */
1150: close(sock);
1.91 mpech 1151: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1152: if (ac == 0) {
1153: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1154: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1155: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1156: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1157: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1158: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1159: exit(0);
1160: }
1.36 deraadt 1161: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1162: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1163: perror("setenv");
1164: exit(1);
1165: }
1.21 markus 1166: execvp(av[0], av);
1167: perror(av[0]);
1168: exit(1);
1169: }
1.81 stevesk 1170: /* child */
1171: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1172:
1173: if (setsid() == -1) {
1.81 stevesk 1174: error("setsid: %s", strerror(errno));
1.67 stevesk 1175: cleanup_exit(1);
1176: }
1177:
1178: (void)chdir("/");
1.107 markus 1179: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1180: /* XXX might close listen socket */
1181: (void)dup2(fd, STDIN_FILENO);
1182: (void)dup2(fd, STDOUT_FILENO);
1183: (void)dup2(fd, STDERR_FILENO);
1184: if (fd > 2)
1185: close(fd);
1186: }
1.21 markus 1187:
1.41 markus 1188: /* deny core dumps, since memory contains unencrypted private keys */
1189: rlim.rlim_cur = rlim.rlim_max = 0;
1190: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1191: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1192: cleanup_exit(1);
1193: }
1.57 markus 1194:
1195: skip:
1.163 markus 1196:
1197: #ifdef ENABLE_PKCS11
1198: pkcs11_init(0);
1199: #endif
1.21 markus 1200: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1201: if (ac > 0)
1202: parent_alive_interval = 10;
1.33 markus 1203: idtab_init();
1.61 markus 1204: signal(SIGPIPE, SIG_IGN);
1.177 djm 1205: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1206: signal(SIGHUP, cleanup_handler);
1207: signal(SIGTERM, cleanup_handler);
1.66 markus 1208: nalloc = 0;
1209:
1.21 markus 1210: while (1) {
1.155 dtucker 1211: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1212: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1213: saved_errno = errno;
1.155 dtucker 1214: if (parent_alive_interval != 0)
1215: check_parent_exists();
1216: (void) reaper(); /* remove expired keys */
1.154 dtucker 1217: if (result < 0) {
1218: if (saved_errno == EINTR)
1.21 markus 1219: continue;
1.154 dtucker 1220: fatal("select: %s", strerror(saved_errno));
1221: } else if (result > 0)
1222: after_select(readsetp, writesetp);
1.15 markus 1223: }
1.21 markus 1224: /* NOTREACHED */
1.1 deraadt 1225: }
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