Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.179
1.179 ! markus 1: /* $OpenBSD: ssh-agent.c,v 1.178 2013/12/06 13:30:08 markus Exp $ */
1.1 deraadt 2: /*
1.22 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * The authentication agent program.
1.33 markus 7: *
1.35 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
1.56 markus 14: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.35 deraadt 15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.22 deraadt 35: */
1.1 deraadt 36:
1.151 deraadt 37: #include <sys/types.h>
1.153 djm 38: #include <sys/time.h>
1.78 provos 39: #include <sys/queue.h>
1.127 stevesk 40: #include <sys/resource.h>
1.128 stevesk 41: #include <sys/types.h>
1.141 stevesk 42: #include <sys/socket.h>
1.128 stevesk 43: #include <sys/un.h>
1.148 stevesk 44: #include <sys/param.h>
1.126 stevesk 45:
1.146 stevesk 46: #include <openssl/evp.h>
47: #include <openssl/md5.h>
48:
1.143 stevesk 49: #include <errno.h>
1.142 stevesk 50: #include <fcntl.h>
1.126 stevesk 51: #include <paths.h>
1.129 stevesk 52: #include <signal.h>
1.149 stevesk 53: #include <stdlib.h>
1.150 stevesk 54: #include <stdio.h>
1.146 stevesk 55: #include <string.h>
1.145 stevesk 56: #include <time.h>
1.144 stevesk 57: #include <unistd.h>
1.1 deraadt 58:
1.151 deraadt 59: #include "xmalloc.h"
1.1 deraadt 60: #include "ssh.h"
61: #include "rsa.h"
62: #include "buffer.h"
1.32 markus 63: #include "key.h"
64: #include "authfd.h"
1.37 markus 65: #include "compat.h"
1.47 markus 66: #include "log.h"
1.107 markus 67: #include "misc.h"
1.7 deraadt 68:
1.163 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;
237: MD5_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);
273: MD5_Init(&md);
274: MD5_Update(&md, buf, 32);
275: MD5_Update(&md, session_id, 16);
276: MD5_Final(mdbuf, &md);
277:
278: /* Send the response. */
279: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
280: for (i = 0; i < 16; i++)
281: buffer_put_char(&msg, mdbuf[i]);
282: goto send;
283: }
1.21 markus 284:
1.33 markus 285: failure:
286: /* Unknown identity or protocol error. Send failure. */
1.21 markus 287: buffer_put_char(&msg, SSH_AGENT_FAILURE);
288: send:
289: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 290: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
291: key_free(key);
292: BN_clear_free(challenge);
293: buffer_free(&msg);
294: }
295:
296: /* ssh2 only */
1.55 itojun 297: static void
1.33 markus 298: process_sign_request2(SocketEntry *e)
299: {
1.45 markus 300: u_char *blob, *data, *signature = NULL;
301: u_int blen, dlen, slen = 0;
1.96 deraadt 302: extern int datafellows;
1.159 djm 303: int odatafellows;
1.96 deraadt 304: int ok = -1, flags;
1.33 markus 305: Buffer msg;
1.96 deraadt 306: Key *key;
1.33 markus 307:
308: datafellows = 0;
1.43 markus 309:
1.87 markus 310: blob = buffer_get_string(&e->request, &blen);
311: data = buffer_get_string(&e->request, &dlen);
1.37 markus 312:
1.87 markus 313: flags = buffer_get_int(&e->request);
1.159 djm 314: odatafellows = datafellows;
1.37 markus 315: if (flags & SSH_AGENT_OLD_SIGNATURE)
316: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 317:
1.39 markus 318: key = key_from_blob(blob, blen);
1.33 markus 319: if (key != NULL) {
1.78 provos 320: Identity *id = lookup_identity(key, 2);
1.107 markus 321: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 322: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 323: key_free(key);
1.33 markus 324: }
325: buffer_init(&msg);
326: if (ok == 0) {
327: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
328: buffer_put_string(&msg, signature, slen);
329: } else {
330: buffer_put_char(&msg, SSH_AGENT_FAILURE);
331: }
332: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 333: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 334: buffer_len(&msg));
1.21 markus 335: buffer_free(&msg);
1.173 djm 336: free(data);
337: free(blob);
338: free(signature);
1.159 djm 339: datafellows = odatafellows;
1.1 deraadt 340: }
341:
1.33 markus 342: /* shared */
1.55 itojun 343: static void
1.33 markus 344: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 345: {
1.96 deraadt 346: u_int blen, bits;
347: int success = 0;
1.78 provos 348: Key *key = NULL;
1.45 markus 349: u_char *blob;
1.21 markus 350:
1.74 deraadt 351: switch (version) {
1.33 markus 352: case 1:
1.39 markus 353: key = key_new(KEY_RSA1);
1.87 markus 354: bits = buffer_get_int(&e->request);
355: buffer_get_bignum(&e->request, key->rsa->e);
356: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 357:
358: if (bits != key_size(key))
1.109 itojun 359: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 360: key_size(key), bits);
1.33 markus 361: break;
362: case 2:
1.87 markus 363: blob = buffer_get_string(&e->request, &blen);
1.39 markus 364: key = key_from_blob(blob, blen);
1.173 djm 365: free(blob);
1.33 markus 366: break;
367: }
368: if (key != NULL) {
1.78 provos 369: Identity *id = lookup_identity(key, version);
370: if (id != NULL) {
1.23 markus 371: /*
372: * We have this key. Free the old key. Since we
1.124 djm 373: * don't want to leave empty slots in the middle of
1.40 markus 374: * the array, we actually free the key there and move
375: * all the entries between the empty slot and the end
376: * of the array.
1.23 markus 377: */
1.33 markus 378: Idtab *tab = idtab_lookup(version);
1.38 markus 379: if (tab->nentries < 1)
380: fatal("process_remove_identity: "
381: "internal error: tab->nentries %d",
382: tab->nentries);
1.78 provos 383: TAILQ_REMOVE(&tab->idlist, id, next);
384: free_identity(id);
1.33 markus 385: tab->nentries--;
386: success = 1;
1.21 markus 387: }
1.33 markus 388: key_free(key);
389: }
1.1 deraadt 390: buffer_put_int(&e->output, 1);
1.33 markus 391: buffer_put_char(&e->output,
392: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 393: }
394:
1.55 itojun 395: static void
1.33 markus 396: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 397: {
1.33 markus 398: Idtab *tab = idtab_lookup(version);
1.78 provos 399: Identity *id;
1.21 markus 400:
401: /* Loop over all identities and clear the keys. */
1.78 provos 402: for (id = TAILQ_FIRST(&tab->idlist); id;
403: id = TAILQ_FIRST(&tab->idlist)) {
404: TAILQ_REMOVE(&tab->idlist, id, next);
405: free_identity(id);
1.21 markus 406: }
407:
408: /* Mark that there are no identities. */
1.33 markus 409: tab->nentries = 0;
1.21 markus 410:
411: /* Send success. */
412: buffer_put_int(&e->output, 1);
413: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 414: }
415:
1.155 dtucker 416: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 417: static time_t
1.89 markus 418: reaper(void)
419: {
1.175 dtucker 420: time_t deadline = 0, now = monotime();
1.89 markus 421: Identity *id, *nxt;
422: int version;
1.96 deraadt 423: Idtab *tab;
1.89 markus 424:
425: for (version = 1; version < 3; version++) {
426: tab = idtab_lookup(version);
427: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
428: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 429: if (id->death == 0)
430: continue;
431: if (now >= id->death) {
1.154 dtucker 432: debug("expiring key '%s'", id->comment);
1.89 markus 433: TAILQ_REMOVE(&tab->idlist, id, next);
434: free_identity(id);
435: tab->nentries--;
1.155 dtucker 436: } else
437: deadline = (deadline == 0) ? id->death :
438: MIN(deadline, id->death);
1.89 markus 439: }
440: }
1.155 dtucker 441: if (deadline == 0 || deadline <= now)
442: return 0;
443: else
444: return (deadline - now);
1.89 markus 445: }
446:
447: static void
1.33 markus 448: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 449: {
1.96 deraadt 450: Idtab *tab = idtab_lookup(version);
1.157 canacar 451: Identity *id;
1.174 dtucker 452: int type, success = 0, confirm = 0;
1.178 markus 453: char *comment;
1.174 dtucker 454: time_t death = 0;
1.33 markus 455: Key *k = NULL;
456:
457: switch (version) {
458: case 1:
1.39 markus 459: k = key_new_private(KEY_RSA1);
1.97 markus 460: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 461: buffer_get_bignum(&e->request, k->rsa->n);
462: buffer_get_bignum(&e->request, k->rsa->e);
463: buffer_get_bignum(&e->request, k->rsa->d);
464: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 465:
466: /* SSH and SSL have p and q swapped */
1.87 markus 467: buffer_get_bignum(&e->request, k->rsa->q); /* p */
468: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 469:
470: /* Generate additional parameters */
1.60 markus 471: rsa_generate_additional_parameters(k->rsa);
1.178 markus 472:
473: if (RSA_blinding_on(k->rsa, NULL) != 1) {
474: error("process_add_identity: RSA_blinding_on failed");
475: key_free(k);
476: goto send;
477: }
1.33 markus 478: break;
479: case 2:
1.178 markus 480: k = key_private_deserialize(&e->request);
481: if (k == NULL) {
1.87 markus 482: buffer_clear(&e->request);
1.33 markus 483: goto send;
1.21 markus 484: }
1.33 markus 485: break;
486: }
1.87 markus 487: comment = buffer_get_string(&e->request, NULL);
1.33 markus 488: if (k == NULL) {
1.173 djm 489: free(comment);
1.33 markus 490: goto send;
491: }
1.94 markus 492: while (buffer_len(&e->request)) {
1.158 djm 493: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 494: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 495: death = monotime() + buffer_get_int(&e->request);
1.94 markus 496: break;
1.107 markus 497: case SSH_AGENT_CONSTRAIN_CONFIRM:
498: confirm = 1;
499: break;
1.94 markus 500: default:
1.158 djm 501: error("process_add_identity: "
502: "Unknown constraint type %d", type);
1.173 djm 503: free(comment);
1.158 djm 504: key_free(k);
505: goto send;
1.94 markus 506: }
507: }
1.158 djm 508: success = 1;
1.106 marc 509: if (lifetime && !death)
1.175 dtucker 510: death = monotime() + lifetime;
1.157 canacar 511: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 512: id = xcalloc(1, sizeof(Identity));
1.78 provos 513: id->key = k;
514: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 515: /* Increment the number of identities. */
516: tab->nentries++;
517: } else {
518: key_free(k);
1.173 djm 519: free(id->comment);
1.33 markus 520: }
1.157 canacar 521: id->comment = comment;
522: id->death = death;
523: id->confirm = confirm;
1.33 markus 524: send:
1.1 deraadt 525: buffer_put_int(&e->output, 1);
1.33 markus 526: buffer_put_char(&e->output,
527: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 528: }
529:
1.88 markus 530: /* XXX todo: encrypt sensitive data with passphrase */
531: static void
532: process_lock_agent(SocketEntry *e, int lock)
533: {
1.96 deraadt 534: int success = 0;
1.88 markus 535: char *passwd;
536:
537: passwd = buffer_get_string(&e->request, NULL);
538: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
539: locked = 0;
540: memset(lock_passwd, 0, strlen(lock_passwd));
1.173 djm 541: free(lock_passwd);
1.88 markus 542: lock_passwd = NULL;
543: success = 1;
544: } else if (!locked && lock) {
545: locked = 1;
546: lock_passwd = xstrdup(passwd);
547: success = 1;
548: }
549: memset(passwd, 0, strlen(passwd));
1.173 djm 550: free(passwd);
1.95 deraadt 551:
1.88 markus 552: buffer_put_int(&e->output, 1);
553: buffer_put_char(&e->output,
554: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
555: }
556:
557: static void
558: no_identities(SocketEntry *e, u_int type)
559: {
560: Buffer msg;
561:
562: buffer_init(&msg);
563: buffer_put_char(&msg,
564: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
565: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
566: buffer_put_int(&msg, 0);
567: buffer_put_int(&e->output, buffer_len(&msg));
568: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
569: buffer_free(&msg);
570: }
1.59 markus 571:
1.163 markus 572: #ifdef ENABLE_PKCS11
1.59 markus 573: static void
1.158 djm 574: process_add_smartcard_key(SocketEntry *e)
1.59 markus 575: {
1.163 markus 576: char *provider = NULL, *pin;
1.174 dtucker 577: int i, type, version, count = 0, success = 0, confirm = 0;
578: time_t death = 0;
1.163 markus 579: Key **keys = NULL, *k;
1.84 markus 580: Identity *id;
1.59 markus 581: Idtab *tab;
1.75 deraadt 582:
1.163 markus 583: provider = buffer_get_string(&e->request, NULL);
1.87 markus 584: pin = buffer_get_string(&e->request, NULL);
1.110 djm 585:
586: while (buffer_len(&e->request)) {
1.158 djm 587: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 588: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 589: death = monotime() + buffer_get_int(&e->request);
1.110 djm 590: break;
591: case SSH_AGENT_CONSTRAIN_CONFIRM:
592: confirm = 1;
593: break;
594: default:
1.158 djm 595: error("process_add_smartcard_key: "
596: "Unknown constraint type %d", type);
597: goto send;
1.110 djm 598: }
599: }
600: if (lifetime && !death)
1.175 dtucker 601: death = monotime() + lifetime;
1.110 djm 602:
1.163 markus 603: count = pkcs11_add_provider(provider, pin, &keys);
604: for (i = 0; i < count; i++) {
1.84 markus 605: k = keys[i];
606: version = k->type == KEY_RSA1 ? 1 : 2;
607: tab = idtab_lookup(version);
608: if (lookup_identity(k, version) == NULL) {
1.163 markus 609: id = xcalloc(1, sizeof(Identity));
1.84 markus 610: id->key = k;
1.163 markus 611: id->provider = xstrdup(provider);
612: id->comment = xstrdup(provider); /* XXX */
1.110 djm 613: id->death = death;
614: id->confirm = confirm;
1.84 markus 615: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
616: tab->nentries++;
617: success = 1;
618: } else {
619: key_free(k);
620: }
621: keys[i] = NULL;
1.59 markus 622: }
623: send:
1.173 djm 624: free(pin);
625: free(provider);
626: free(keys);
1.59 markus 627: buffer_put_int(&e->output, 1);
628: buffer_put_char(&e->output,
629: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
630: }
631:
632: static void
633: process_remove_smartcard_key(SocketEntry *e)
634: {
1.163 markus 635: char *provider = NULL, *pin = NULL;
636: int version, success = 0;
637: Identity *id, *nxt;
1.84 markus 638: Idtab *tab;
1.59 markus 639:
1.163 markus 640: provider = buffer_get_string(&e->request, NULL);
1.87 markus 641: pin = buffer_get_string(&e->request, NULL);
1.173 djm 642: free(pin);
1.59 markus 643:
1.163 markus 644: for (version = 1; version < 3; version++) {
645: tab = idtab_lookup(version);
646: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
647: nxt = TAILQ_NEXT(id, next);
648: if (!strcmp(provider, id->provider)) {
649: TAILQ_REMOVE(&tab->idlist, id, next);
650: free_identity(id);
651: tab->nentries--;
652: }
1.59 markus 653: }
654: }
1.163 markus 655: if (pkcs11_del_provider(provider) == 0)
656: success = 1;
657: else
658: error("process_remove_smartcard_key:"
659: " pkcs11_del_provider failed");
1.173 djm 660: free(provider);
1.59 markus 661: buffer_put_int(&e->output, 1);
662: buffer_put_char(&e->output,
663: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
664: }
1.163 markus 665: #endif /* ENABLE_PKCS11 */
1.59 markus 666:
1.33 markus 667: /* dispatch incoming messages */
668:
1.55 itojun 669: static void
1.2 provos 670: process_message(SocketEntry *e)
1.1 deraadt 671: {
1.96 deraadt 672: u_int msg_len, type;
1.45 markus 673: u_char *cp;
1.89 markus 674:
1.21 markus 675: if (buffer_len(&e->input) < 5)
676: return; /* Incomplete message. */
1.77 stevesk 677: cp = buffer_ptr(&e->input);
1.137 djm 678: msg_len = get_u32(cp);
1.21 markus 679: if (msg_len > 256 * 1024) {
1.101 stevesk 680: close_socket(e);
1.21 markus 681: return;
682: }
683: if (buffer_len(&e->input) < msg_len + 4)
684: return;
1.87 markus 685:
686: /* move the current input to e->request */
1.21 markus 687: buffer_consume(&e->input, 4);
1.87 markus 688: buffer_clear(&e->request);
689: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
690: buffer_consume(&e->input, msg_len);
691: type = buffer_get_char(&e->request);
1.21 markus 692:
1.88 markus 693: /* check wheter agent is locked */
694: if (locked && type != SSH_AGENTC_UNLOCK) {
695: buffer_clear(&e->request);
696: switch (type) {
697: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
698: case SSH2_AGENTC_REQUEST_IDENTITIES:
699: /* send empty lists */
700: no_identities(e, type);
701: break;
702: default:
703: /* send a fail message for all other request types */
704: buffer_put_int(&e->output, 1);
705: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
706: }
707: return;
708: }
709:
1.59 markus 710: debug("type %d", type);
1.21 markus 711: switch (type) {
1.88 markus 712: case SSH_AGENTC_LOCK:
713: case SSH_AGENTC_UNLOCK:
714: process_lock_agent(e, type == SSH_AGENTC_LOCK);
715: break;
1.33 markus 716: /* ssh1 */
717: case SSH_AGENTC_RSA_CHALLENGE:
718: process_authentication_challenge1(e);
719: break;
1.21 markus 720: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 721: process_request_identities(e, 1);
1.21 markus 722: break;
723: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 724: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 725: process_add_identity(e, 1);
1.21 markus 726: break;
727: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 728: process_remove_identity(e, 1);
1.21 markus 729: break;
730: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 731: process_remove_all_identities(e, 1);
732: break;
733: /* ssh2 */
734: case SSH2_AGENTC_SIGN_REQUEST:
735: process_sign_request2(e);
736: break;
737: case SSH2_AGENTC_REQUEST_IDENTITIES:
738: process_request_identities(e, 2);
739: break;
740: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 741: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 742: process_add_identity(e, 2);
743: break;
744: case SSH2_AGENTC_REMOVE_IDENTITY:
745: process_remove_identity(e, 2);
746: break;
747: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
748: process_remove_all_identities(e, 2);
1.21 markus 749: break;
1.163 markus 750: #ifdef ENABLE_PKCS11
1.59 markus 751: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 752: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 753: process_add_smartcard_key(e);
1.75 deraadt 754: break;
1.59 markus 755: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
756: process_remove_smartcard_key(e);
1.75 deraadt 757: break;
1.163 markus 758: #endif /* ENABLE_PKCS11 */
1.21 markus 759: default:
760: /* Unknown message. Respond with failure. */
761: error("Unknown message %d", type);
1.87 markus 762: buffer_clear(&e->request);
1.21 markus 763: buffer_put_int(&e->output, 1);
764: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
765: break;
766: }
1.1 deraadt 767: }
768:
1.55 itojun 769: static void
1.73 stevesk 770: new_socket(sock_type type, int fd)
1.1 deraadt 771: {
1.112 markus 772: u_int i, old_alloc, new_alloc;
1.96 deraadt 773:
1.119 djm 774: set_nonblock(fd);
1.21 markus 775:
776: if (fd > max_fd)
777: max_fd = fd;
778:
779: for (i = 0; i < sockets_alloc; i++)
780: if (sockets[i].type == AUTH_UNUSED) {
781: sockets[i].fd = fd;
782: buffer_init(&sockets[i].input);
783: buffer_init(&sockets[i].output);
1.87 markus 784: buffer_init(&sockets[i].request);
1.112 markus 785: sockets[i].type = type;
1.21 markus 786: return;
787: }
788: old_alloc = sockets_alloc;
1.112 markus 789: new_alloc = sockets_alloc + 10;
1.133 djm 790: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 791: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 792: sockets[i].type = AUTH_UNUSED;
1.112 markus 793: sockets_alloc = new_alloc;
1.21 markus 794: sockets[old_alloc].fd = fd;
795: buffer_init(&sockets[old_alloc].input);
796: buffer_init(&sockets[old_alloc].output);
1.87 markus 797: buffer_init(&sockets[old_alloc].request);
1.112 markus 798: sockets[old_alloc].type = type;
1.1 deraadt 799: }
800:
1.55 itojun 801: static int
1.155 dtucker 802: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
803: struct timeval **tvpp)
1.1 deraadt 804: {
1.174 dtucker 805: u_int i, sz;
1.46 markus 806: int n = 0;
1.155 dtucker 807: static struct timeval tv;
1.174 dtucker 808: time_t deadline;
1.46 markus 809:
810: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 811: switch (sockets[i].type) {
812: case AUTH_SOCKET:
813: case AUTH_CONNECTION:
1.46 markus 814: n = MAX(n, sockets[i].fd);
1.21 markus 815: break;
816: case AUTH_UNUSED:
817: break;
818: default:
819: fatal("Unknown socket type %d", sockets[i].type);
820: break;
821: }
1.46 markus 822: }
823:
824: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 825: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 826: free(*fdrp);
827: free(*fdwp);
1.46 markus 828: *fdrp = xmalloc(sz);
829: *fdwp = xmalloc(sz);
1.66 markus 830: *nallocp = sz;
1.46 markus 831: }
1.66 markus 832: if (n < *fdl)
833: debug("XXX shrink: %d < %d", n, *fdl);
834: *fdl = n;
1.46 markus 835: memset(*fdrp, 0, sz);
836: memset(*fdwp, 0, sz);
837:
838: for (i = 0; i < sockets_alloc; i++) {
839: switch (sockets[i].type) {
840: case AUTH_SOCKET:
841: case AUTH_CONNECTION:
842: FD_SET(sockets[i].fd, *fdrp);
843: if (buffer_len(&sockets[i].output) > 0)
844: FD_SET(sockets[i].fd, *fdwp);
845: break;
846: default:
847: break;
848: }
849: }
1.155 dtucker 850: deadline = reaper();
851: if (parent_alive_interval != 0)
852: deadline = (deadline == 0) ? parent_alive_interval :
853: MIN(deadline, parent_alive_interval);
854: if (deadline == 0) {
855: *tvpp = NULL;
856: } else {
857: tv.tv_sec = deadline;
858: tv.tv_usec = 0;
859: *tvpp = &tv;
860: }
1.46 markus 861: return (1);
1.21 markus 862: }
863:
1.55 itojun 864: static void
1.21 markus 865: after_select(fd_set *readset, fd_set *writeset)
866: {
1.96 deraadt 867: struct sockaddr_un sunaddr;
1.26 markus 868: socklen_t slen;
1.21 markus 869: char buf[1024];
1.96 deraadt 870: int len, sock;
1.162 djm 871: u_int i, orig_alloc;
1.103 markus 872: uid_t euid;
873: gid_t egid;
1.21 markus 874:
1.162 djm 875: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 876: switch (sockets[i].type) {
877: case AUTH_UNUSED:
878: break;
879: case AUTH_SOCKET:
880: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 881: slen = sizeof(sunaddr);
1.46 markus 882: sock = accept(sockets[i].fd,
1.131 deraadt 883: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 884: if (sock < 0) {
1.81 stevesk 885: error("accept from AUTH_SOCKET: %s",
886: strerror(errno));
1.103 markus 887: break;
888: }
889: if (getpeereid(sock, &euid, &egid) < 0) {
890: error("getpeereid %d failed: %s",
891: sock, strerror(errno));
892: close(sock);
893: break;
894: }
1.105 markus 895: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 896: error("uid mismatch: "
1.104 stevesk 897: "peer euid %u != uid %u",
898: (u_int) euid, (u_int) getuid());
1.103 markus 899: close(sock);
1.21 markus 900: break;
901: }
902: new_socket(AUTH_CONNECTION, sock);
903: }
904: break;
905: case AUTH_CONNECTION:
906: if (buffer_len(&sockets[i].output) > 0 &&
907: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 908: len = write(sockets[i].fd,
909: buffer_ptr(&sockets[i].output),
910: buffer_len(&sockets[i].output));
911: if (len == -1 && (errno == EAGAIN ||
912: errno == EINTR))
913: continue;
1.21 markus 914: if (len <= 0) {
1.101 stevesk 915: close_socket(&sockets[i]);
1.21 markus 916: break;
917: }
918: buffer_consume(&sockets[i].output, len);
919: }
920: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 921: len = read(sockets[i].fd, buf, sizeof(buf));
922: if (len == -1 && (errno == EAGAIN ||
923: errno == EINTR))
924: continue;
1.21 markus 925: if (len <= 0) {
1.101 stevesk 926: close_socket(&sockets[i]);
1.21 markus 927: break;
928: }
929: buffer_append(&sockets[i].input, buf, len);
930: process_message(&sockets[i]);
931: }
932: break;
933: default:
934: fatal("Unknown type %d", sockets[i].type);
935: }
1.1 deraadt 936: }
937:
1.55 itojun 938: static void
1.113 markus 939: cleanup_socket(void)
1.15 markus 940: {
1.48 deraadt 941: if (socket_name[0])
942: unlink(socket_name);
943: if (socket_dir[0])
944: rmdir(socket_dir);
1.10 markus 945: }
946:
1.114 markus 947: void
1.15 markus 948: cleanup_exit(int i)
949: {
1.113 markus 950: cleanup_socket();
951: _exit(i);
1.15 markus 952: }
953:
1.135 deraadt 954: /*ARGSUSED*/
1.55 itojun 955: static void
1.48 deraadt 956: cleanup_handler(int sig)
957: {
1.113 markus 958: cleanup_socket();
1.163 markus 959: #ifdef ENABLE_PKCS11
960: pkcs11_terminate();
961: #endif
1.48 deraadt 962: _exit(2);
1.113 markus 963: }
964:
1.68 markus 965: static void
1.155 dtucker 966: check_parent_exists(void)
1.68 markus 967: {
1.172 dtucker 968: /*
969: * If our parent has exited then getppid() will return (pid_t)1,
970: * so testing for that should be safe.
971: */
972: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 973: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 974: cleanup_socket();
975: _exit(2);
1.68 markus 976: }
1.48 deraadt 977: }
978:
1.55 itojun 979: static void
1.50 itojun 980: usage(void)
1.15 markus 981: {
1.156 sobrado 982: fprintf(stderr, "usage: %s [options] [command [arg ...]]\n",
1.46 markus 983: __progname);
1.72 jakob 984: fprintf(stderr, "Options:\n");
985: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
986: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
987: fprintf(stderr, " -k Kill the current agent.\n");
988: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 989: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 990: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 991: exit(1);
1.15 markus 992: }
993:
1.2 provos 994: int
995: main(int ac, char **av)
1.1 deraadt 996: {
1.107 markus 997: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 998: int sock, fd, ch, result, saved_errno;
1.120 avsm 999: u_int nalloc;
1.96 deraadt 1000: char *shell, *format, *pidstr, *agentsocket = NULL;
1001: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1002: struct sockaddr_un sunaddr;
1.41 markus 1003: struct rlimit rlim;
1.96 deraadt 1004: extern int optind;
1.98 stevesk 1005: extern char *optarg;
1.21 markus 1006: pid_t pid;
1.96 deraadt 1007: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1008: struct timeval *tvp = NULL;
1.161 tobias 1009: size_t len;
1.123 djm 1010:
1011: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1012: sanitise_stdfd();
1.99 markus 1013:
1014: /* drop */
1015: setegid(getgid());
1016: setgid(getgid());
1.53 markus 1017:
1.170 djm 1018: OpenSSL_add_all_algorithms();
1.21 markus 1019:
1.106 marc 1020: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1021: switch (ch) {
1022: case 'c':
1023: if (s_flag)
1024: usage();
1025: c_flag++;
1026: break;
1027: case 'k':
1028: k_flag++;
1029: break;
1030: case 's':
1031: if (c_flag)
1032: usage();
1033: s_flag++;
1034: break;
1.57 markus 1035: case 'd':
1036: if (d_flag)
1037: usage();
1038: d_flag++;
1039: break;
1.86 markus 1040: case 'a':
1041: agentsocket = optarg;
1.106 marc 1042: break;
1043: case 't':
1044: if ((lifetime = convtime(optarg)) == -1) {
1045: fprintf(stderr, "Invalid lifetime\n");
1046: usage();
1047: }
1.86 markus 1048: break;
1.21 markus 1049: default:
1050: usage();
1051: }
1052: }
1053: ac -= optind;
1054: av += optind;
1055:
1.57 markus 1056: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1057: usage();
1058:
1.85 markus 1059: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1060: shell = getenv("SHELL");
1.161 tobias 1061: if (shell != NULL && (len = strlen(shell)) > 2 &&
1062: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1063: c_flag = 1;
1064: }
1065: if (k_flag) {
1.136 deraadt 1066: const char *errstr = NULL;
1067:
1.21 markus 1068: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1069: if (pidstr == NULL) {
1070: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1071: SSH_AGENTPID_ENV_NAME);
1.21 markus 1072: exit(1);
1073: }
1.136 deraadt 1074: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1075: if (errstr) {
1076: fprintf(stderr,
1077: "%s=\"%s\", which is not a good PID: %s\n",
1078: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1079: exit(1);
1080: }
1081: if (kill(pid, SIGTERM) == -1) {
1082: perror("kill");
1083: exit(1);
1084: }
1085: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1086: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1087: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1088: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1089: exit(0);
1090: }
1091: parent_pid = getpid();
1092:
1.86 markus 1093: if (agentsocket == NULL) {
1094: /* Create private directory for agent socket */
1.171 djm 1095: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1096: if (mkdtemp(socket_dir) == NULL) {
1097: perror("mkdtemp: private socket dir");
1098: exit(1);
1099: }
1.91 mpech 1100: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1101: (long)parent_pid);
1.86 markus 1102: } else {
1103: /* Try to use specified agent socket */
1104: socket_dir[0] = '\0';
1105: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1106: }
1107:
1.23 markus 1108: /*
1109: * Create socket early so it will exist before command gets run from
1110: * the parent.
1111: */
1.21 markus 1112: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1113: if (sock < 0) {
1114: perror("socket");
1.121 djm 1115: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1116: cleanup_exit(1);
1117: }
1118: memset(&sunaddr, 0, sizeof(sunaddr));
1119: sunaddr.sun_family = AF_UNIX;
1120: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1121: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1122: perror("bind");
1.121 djm 1123: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1124: cleanup_exit(1);
1125: }
1.117 markus 1126: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1127: perror("listen");
1128: cleanup_exit(1);
1129: }
1.46 markus 1130:
1.23 markus 1131: /*
1132: * Fork, and have the parent execute the command, if any, or present
1133: * the socket data. The child continues as the authentication agent.
1134: */
1.57 markus 1135: if (d_flag) {
1136: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1137: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1138: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1139: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1140: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1141: goto skip;
1142: }
1.21 markus 1143: pid = fork();
1144: if (pid == -1) {
1145: perror("fork");
1.81 stevesk 1146: cleanup_exit(1);
1.21 markus 1147: }
1148: if (pid != 0) { /* Parent - execute the given command. */
1149: close(sock);
1.91 mpech 1150: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1151: if (ac == 0) {
1152: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1153: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1154: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1155: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1156: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1157: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1158: exit(0);
1159: }
1.36 deraadt 1160: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1161: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1162: perror("setenv");
1163: exit(1);
1164: }
1.21 markus 1165: execvp(av[0], av);
1166: perror(av[0]);
1167: exit(1);
1168: }
1.81 stevesk 1169: /* child */
1170: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1171:
1172: if (setsid() == -1) {
1.81 stevesk 1173: error("setsid: %s", strerror(errno));
1.67 stevesk 1174: cleanup_exit(1);
1175: }
1176:
1177: (void)chdir("/");
1.107 markus 1178: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1179: /* XXX might close listen socket */
1180: (void)dup2(fd, STDIN_FILENO);
1181: (void)dup2(fd, STDOUT_FILENO);
1182: (void)dup2(fd, STDERR_FILENO);
1183: if (fd > 2)
1184: close(fd);
1185: }
1.21 markus 1186:
1.41 markus 1187: /* deny core dumps, since memory contains unencrypted private keys */
1188: rlim.rlim_cur = rlim.rlim_max = 0;
1189: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1190: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1191: cleanup_exit(1);
1192: }
1.57 markus 1193:
1194: skip:
1.163 markus 1195:
1196: #ifdef ENABLE_PKCS11
1197: pkcs11_init(0);
1198: #endif
1.21 markus 1199: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1200: if (ac > 0)
1201: parent_alive_interval = 10;
1.33 markus 1202: idtab_init();
1.61 markus 1203: signal(SIGPIPE, SIG_IGN);
1.177 djm 1204: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1205: signal(SIGHUP, cleanup_handler);
1206: signal(SIGTERM, cleanup_handler);
1.66 markus 1207: nalloc = 0;
1208:
1.21 markus 1209: while (1) {
1.155 dtucker 1210: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1211: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1212: saved_errno = errno;
1.155 dtucker 1213: if (parent_alive_interval != 0)
1214: check_parent_exists();
1215: (void) reaper(); /* remove expired keys */
1.154 dtucker 1216: if (result < 0) {
1217: if (saved_errno == EINTR)
1.21 markus 1218: continue;
1.154 dtucker 1219: fatal("select: %s", strerror(saved_errno));
1220: } else if (result > 0)
1221: after_select(readsetp, writesetp);
1.15 markus 1222: }
1.21 markus 1223: /* NOTREACHED */
1.1 deraadt 1224: }
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