Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.149
1.149 ! stevesk 1: /* $OpenBSD: ssh-agent.c,v 1.148 2006/07/26 02:35:17 stevesk 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:
37: #include "includes.h"
1.125 stevesk 38:
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>
1.147 stevesk 44: #include <sys/time.h>
1.148 stevesk 45: #include <sys/param.h>
1.126 stevesk 46:
1.146 stevesk 47: #include <openssl/evp.h>
48: #include <openssl/md5.h>
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>
1.146 stevesk 55: #include <string.h>
1.145 stevesk 56: #include <time.h>
1.144 stevesk 57: #include <unistd.h>
1.1 deraadt 58:
59: #include "ssh.h"
60: #include "rsa.h"
61: #include "buffer.h"
62: #include "bufaux.h"
63: #include "xmalloc.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"
1.7 deraadt 69:
1.59 markus 70: #ifdef SMARTCARD
71: #include "scard.h"
1.71 jakob 72: #endif
1.59 markus 73:
1.73 stevesk 74: typedef enum {
75: AUTH_UNUSED,
76: AUTH_SOCKET,
77: AUTH_CONNECTION
78: } sock_type;
79:
1.21 markus 80: typedef struct {
81: int fd;
1.73 stevesk 82: sock_type type;
1.21 markus 83: Buffer input;
84: Buffer output;
1.87 markus 85: Buffer request;
1.1 deraadt 86: } SocketEntry;
87:
1.45 markus 88: u_int sockets_alloc = 0;
1.1 deraadt 89: SocketEntry *sockets = NULL;
90:
1.78 provos 91: typedef struct identity {
92: TAILQ_ENTRY(identity) next;
1.33 markus 93: Key *key;
1.21 markus 94: char *comment;
1.89 markus 95: u_int 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;
1.10 markus 111:
112: /* pathname and directory for AUTH_SOCKET */
1.132 djm 113: char socket_name[MAXPATHLEN];
114: char socket_dir[MAXPATHLEN];
1.10 markus 115:
1.88 markus 116: /* locking */
117: int locked = 0;
118: char *lock_passwd = NULL;
119:
1.20 markus 120: extern char *__progname;
121:
1.106 marc 122: /* Default lifetime (0 == forever) */
123: static int lifetime = 0;
124:
1.55 itojun 125: static void
1.101 stevesk 126: close_socket(SocketEntry *e)
127: {
128: close(e->fd);
129: e->fd = -1;
130: e->type = AUTH_UNUSED;
131: buffer_free(&e->input);
132: buffer_free(&e->output);
133: buffer_free(&e->request);
134: }
135:
136: static void
1.33 markus 137: idtab_init(void)
1.1 deraadt 138: {
1.33 markus 139: int i;
1.96 deraadt 140:
1.74 deraadt 141: for (i = 0; i <=2; i++) {
1.78 provos 142: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 143: idtable[i].nentries = 0;
144: }
145: }
146:
147: /* return private key table for requested protocol version */
1.55 itojun 148: static Idtab *
1.33 markus 149: idtab_lookup(int version)
150: {
151: if (version < 1 || version > 2)
152: fatal("internal error, bad protocol version %d", version);
153: return &idtable[version];
154: }
155:
1.89 markus 156: static void
157: free_identity(Identity *id)
158: {
159: key_free(id->key);
160: xfree(id->comment);
161: xfree(id);
162: }
163:
1.33 markus 164: /* return matching private key for given public key */
1.78 provos 165: static Identity *
166: lookup_identity(Key *key, int version)
1.33 markus 167: {
1.78 provos 168: Identity *id;
169:
1.33 markus 170: Idtab *tab = idtab_lookup(version);
1.78 provos 171: TAILQ_FOREACH(id, &tab->idlist, next) {
172: if (key_equal(key, id->key))
173: return (id);
1.33 markus 174: }
1.78 provos 175: return (NULL);
176: }
177:
1.107 markus 178: /* Check confirmation of keysign request */
179: static int
180: confirm_key(Identity *id)
181: {
1.122 djm 182: char *p;
1.107 markus 183: int ret = -1;
184:
185: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 186: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
187: id->comment, p))
188: ret = 0;
1.107 markus 189: xfree(p);
1.122 djm 190:
1.107 markus 191: return (ret);
192: }
193:
1.33 markus 194: /* send list of supported public keys to 'client' */
1.55 itojun 195: static void
1.33 markus 196: process_request_identities(SocketEntry *e, int version)
197: {
198: Idtab *tab = idtab_lookup(version);
1.96 deraadt 199: Identity *id;
1.21 markus 200: Buffer msg;
1.1 deraadt 201:
1.21 markus 202: buffer_init(&msg);
1.33 markus 203: buffer_put_char(&msg, (version == 1) ?
204: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
205: buffer_put_int(&msg, tab->nentries);
1.78 provos 206: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 207: if (id->key->type == KEY_RSA1) {
1.33 markus 208: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
209: buffer_put_bignum(&msg, id->key->rsa->e);
210: buffer_put_bignum(&msg, id->key->rsa->n);
211: } else {
1.45 markus 212: u_char *blob;
213: u_int blen;
1.39 markus 214: key_to_blob(id->key, &blob, &blen);
1.33 markus 215: buffer_put_string(&msg, blob, blen);
216: xfree(blob);
217: }
218: buffer_put_cstring(&msg, id->comment);
1.21 markus 219: }
220: buffer_put_int(&e->output, buffer_len(&msg));
221: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
222: buffer_free(&msg);
1.1 deraadt 223: }
224:
1.33 markus 225: /* ssh1 only */
1.55 itojun 226: static void
1.33 markus 227: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 228: {
1.96 deraadt 229: u_char buf[32], mdbuf[16], session_id[16];
230: u_int response_type;
231: BIGNUM *challenge;
1.78 provos 232: Identity *id;
1.33 markus 233: int i, len;
1.21 markus 234: Buffer msg;
235: MD5_CTX md;
1.96 deraadt 236: Key *key;
1.21 markus 237:
238: buffer_init(&msg);
1.39 markus 239: key = key_new(KEY_RSA1);
1.76 markus 240: if ((challenge = BN_new()) == NULL)
241: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 242:
1.97 markus 243: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 244: buffer_get_bignum(&e->request, key->rsa->e);
245: buffer_get_bignum(&e->request, key->rsa->n);
246: buffer_get_bignum(&e->request, challenge);
1.21 markus 247:
1.33 markus 248: /* Only protocol 1.1 is supported */
1.87 markus 249: if (buffer_len(&e->request) == 0)
1.33 markus 250: goto failure;
1.87 markus 251: buffer_get(&e->request, session_id, 16);
252: response_type = buffer_get_int(&e->request);
1.33 markus 253: if (response_type != 1)
254: goto failure;
255:
1.78 provos 256: id = lookup_identity(key, 1);
1.107 markus 257: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 258: Key *private = id->key;
1.33 markus 259: /* Decrypt the challenge using the private key. */
1.49 markus 260: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
261: goto failure;
1.33 markus 262:
263: /* The response is MD5 of decrypted challenge plus session id. */
264: len = BN_num_bytes(challenge);
265: if (len <= 0 || len > 32) {
1.109 itojun 266: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 267: goto failure;
268: }
269: memset(buf, 0, 32);
270: BN_bn2bin(challenge, buf + 32 - len);
271: MD5_Init(&md);
272: MD5_Update(&md, buf, 32);
273: MD5_Update(&md, session_id, 16);
274: MD5_Final(mdbuf, &md);
275:
276: /* Send the response. */
277: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
278: for (i = 0; i < 16; i++)
279: buffer_put_char(&msg, mdbuf[i]);
280: goto send;
281: }
1.21 markus 282:
1.33 markus 283: failure:
284: /* Unknown identity or protocol error. Send failure. */
1.21 markus 285: buffer_put_char(&msg, SSH_AGENT_FAILURE);
286: send:
287: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 288: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
289: key_free(key);
290: BN_clear_free(challenge);
291: buffer_free(&msg);
292: }
293:
294: /* ssh2 only */
1.55 itojun 295: static void
1.33 markus 296: process_sign_request2(SocketEntry *e)
297: {
1.45 markus 298: u_char *blob, *data, *signature = NULL;
299: u_int blen, dlen, slen = 0;
1.96 deraadt 300: extern int datafellows;
301: int ok = -1, flags;
1.33 markus 302: Buffer msg;
1.96 deraadt 303: Key *key;
1.33 markus 304:
305: datafellows = 0;
1.43 markus 306:
1.87 markus 307: blob = buffer_get_string(&e->request, &blen);
308: data = buffer_get_string(&e->request, &dlen);
1.37 markus 309:
1.87 markus 310: flags = buffer_get_int(&e->request);
1.37 markus 311: if (flags & SSH_AGENT_OLD_SIGNATURE)
312: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 313:
1.39 markus 314: key = key_from_blob(blob, blen);
1.33 markus 315: if (key != NULL) {
1.78 provos 316: Identity *id = lookup_identity(key, 2);
1.107 markus 317: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 318: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 319: key_free(key);
1.33 markus 320: }
321: buffer_init(&msg);
322: if (ok == 0) {
323: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
324: buffer_put_string(&msg, signature, slen);
325: } else {
326: buffer_put_char(&msg, SSH_AGENT_FAILURE);
327: }
328: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 329: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 330: buffer_len(&msg));
1.21 markus 331: buffer_free(&msg);
1.33 markus 332: xfree(data);
333: xfree(blob);
334: if (signature != NULL)
335: xfree(signature);
1.1 deraadt 336: }
337:
1.33 markus 338: /* shared */
1.55 itojun 339: static void
1.33 markus 340: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 341: {
1.96 deraadt 342: u_int blen, bits;
343: int success = 0;
1.78 provos 344: Key *key = NULL;
1.45 markus 345: u_char *blob;
1.21 markus 346:
1.74 deraadt 347: switch (version) {
1.33 markus 348: case 1:
1.39 markus 349: key = key_new(KEY_RSA1);
1.87 markus 350: bits = buffer_get_int(&e->request);
351: buffer_get_bignum(&e->request, key->rsa->e);
352: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 353:
354: if (bits != key_size(key))
1.109 itojun 355: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 356: key_size(key), bits);
1.33 markus 357: break;
358: case 2:
1.87 markus 359: blob = buffer_get_string(&e->request, &blen);
1.39 markus 360: key = key_from_blob(blob, blen);
1.33 markus 361: xfree(blob);
362: break;
363: }
364: if (key != NULL) {
1.78 provos 365: Identity *id = lookup_identity(key, version);
366: if (id != NULL) {
1.23 markus 367: /*
368: * We have this key. Free the old key. Since we
1.124 djm 369: * don't want to leave empty slots in the middle of
1.40 markus 370: * the array, we actually free the key there and move
371: * all the entries between the empty slot and the end
372: * of the array.
1.23 markus 373: */
1.33 markus 374: Idtab *tab = idtab_lookup(version);
1.38 markus 375: if (tab->nentries < 1)
376: fatal("process_remove_identity: "
377: "internal error: tab->nentries %d",
378: tab->nentries);
1.78 provos 379: TAILQ_REMOVE(&tab->idlist, id, next);
380: free_identity(id);
1.33 markus 381: tab->nentries--;
382: success = 1;
1.21 markus 383: }
1.33 markus 384: key_free(key);
385: }
1.1 deraadt 386: buffer_put_int(&e->output, 1);
1.33 markus 387: buffer_put_char(&e->output,
388: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 389: }
390:
1.55 itojun 391: static void
1.33 markus 392: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 393: {
1.33 markus 394: Idtab *tab = idtab_lookup(version);
1.78 provos 395: Identity *id;
1.21 markus 396:
397: /* Loop over all identities and clear the keys. */
1.78 provos 398: for (id = TAILQ_FIRST(&tab->idlist); id;
399: id = TAILQ_FIRST(&tab->idlist)) {
400: TAILQ_REMOVE(&tab->idlist, id, next);
401: free_identity(id);
1.21 markus 402: }
403:
404: /* Mark that there are no identities. */
1.33 markus 405: tab->nentries = 0;
1.21 markus 406:
407: /* Send success. */
408: buffer_put_int(&e->output, 1);
409: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 410: }
411:
1.55 itojun 412: static void
1.89 markus 413: reaper(void)
414: {
1.96 deraadt 415: u_int now = time(NULL);
1.89 markus 416: Identity *id, *nxt;
417: int version;
1.96 deraadt 418: Idtab *tab;
1.89 markus 419:
420: for (version = 1; version < 3; version++) {
421: tab = idtab_lookup(version);
422: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
423: nxt = TAILQ_NEXT(id, next);
424: if (id->death != 0 && now >= id->death) {
425: TAILQ_REMOVE(&tab->idlist, id, next);
426: free_identity(id);
427: tab->nentries--;
428: }
429: }
430: }
431: }
432:
433: static void
1.33 markus 434: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 435: {
1.96 deraadt 436: Idtab *tab = idtab_lookup(version);
1.107 markus 437: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 438: char *type_name, *comment;
1.33 markus 439: Key *k = NULL;
440:
441: switch (version) {
442: case 1:
1.39 markus 443: k = key_new_private(KEY_RSA1);
1.97 markus 444: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 445: buffer_get_bignum(&e->request, k->rsa->n);
446: buffer_get_bignum(&e->request, k->rsa->e);
447: buffer_get_bignum(&e->request, k->rsa->d);
448: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 449:
450: /* SSH and SSL have p and q swapped */
1.87 markus 451: buffer_get_bignum(&e->request, k->rsa->q); /* p */
452: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 453:
454: /* Generate additional parameters */
1.60 markus 455: rsa_generate_additional_parameters(k->rsa);
1.33 markus 456: break;
457: case 2:
1.87 markus 458: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 459: type = key_type_from_name(type_name);
1.39 markus 460: xfree(type_name);
1.74 deraadt 461: switch (type) {
1.39 markus 462: case KEY_DSA:
463: k = key_new_private(type);
1.87 markus 464: buffer_get_bignum2(&e->request, k->dsa->p);
465: buffer_get_bignum2(&e->request, k->dsa->q);
466: buffer_get_bignum2(&e->request, k->dsa->g);
467: buffer_get_bignum2(&e->request, k->dsa->pub_key);
468: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 469: break;
470: case KEY_RSA:
471: k = key_new_private(type);
1.87 markus 472: buffer_get_bignum2(&e->request, k->rsa->n);
473: buffer_get_bignum2(&e->request, k->rsa->e);
474: buffer_get_bignum2(&e->request, k->rsa->d);
475: buffer_get_bignum2(&e->request, k->rsa->iqmp);
476: buffer_get_bignum2(&e->request, k->rsa->p);
477: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 478:
479: /* Generate additional parameters */
1.60 markus 480: rsa_generate_additional_parameters(k->rsa);
1.39 markus 481: break;
482: default:
1.87 markus 483: buffer_clear(&e->request);
1.108 markus 484: goto send;
485: }
486: break;
487: }
488: /* enable blinding */
489: switch (k->type) {
490: case KEY_RSA:
491: case KEY_RSA1:
492: if (RSA_blinding_on(k->rsa, NULL) != 1) {
493: error("process_add_identity: RSA_blinding_on failed");
494: key_free(k);
1.33 markus 495: goto send;
1.21 markus 496: }
1.33 markus 497: break;
498: }
1.87 markus 499: comment = buffer_get_string(&e->request, NULL);
1.33 markus 500: if (k == NULL) {
501: xfree(comment);
502: goto send;
503: }
504: success = 1;
1.94 markus 505: while (buffer_len(&e->request)) {
506: switch (buffer_get_char(&e->request)) {
507: case SSH_AGENT_CONSTRAIN_LIFETIME:
508: death = time(NULL) + buffer_get_int(&e->request);
509: break;
1.107 markus 510: case SSH_AGENT_CONSTRAIN_CONFIRM:
511: confirm = 1;
512: break;
1.94 markus 513: default:
514: break;
515: }
516: }
1.106 marc 517: if (lifetime && !death)
518: death = time(NULL) + lifetime;
1.78 provos 519: if (lookup_identity(k, version) == NULL) {
520: Identity *id = xmalloc(sizeof(Identity));
521: id->key = k;
522: id->comment = comment;
1.94 markus 523: id->death = death;
1.107 markus 524: id->confirm = confirm;
1.78 provos 525: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 526: /* Increment the number of identities. */
527: tab->nentries++;
528: } else {
529: key_free(k);
530: xfree(comment);
531: }
532: send:
1.1 deraadt 533: buffer_put_int(&e->output, 1);
1.33 markus 534: buffer_put_char(&e->output,
535: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 536: }
537:
1.88 markus 538: /* XXX todo: encrypt sensitive data with passphrase */
539: static void
540: process_lock_agent(SocketEntry *e, int lock)
541: {
1.96 deraadt 542: int success = 0;
1.88 markus 543: char *passwd;
544:
545: passwd = buffer_get_string(&e->request, NULL);
546: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
547: locked = 0;
548: memset(lock_passwd, 0, strlen(lock_passwd));
549: xfree(lock_passwd);
550: lock_passwd = NULL;
551: success = 1;
552: } else if (!locked && lock) {
553: locked = 1;
554: lock_passwd = xstrdup(passwd);
555: success = 1;
556: }
557: memset(passwd, 0, strlen(passwd));
558: xfree(passwd);
1.95 deraadt 559:
1.88 markus 560: buffer_put_int(&e->output, 1);
561: buffer_put_char(&e->output,
562: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
563: }
564:
565: static void
566: no_identities(SocketEntry *e, u_int type)
567: {
568: Buffer msg;
569:
570: buffer_init(&msg);
571: buffer_put_char(&msg,
572: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
573: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
574: buffer_put_int(&msg, 0);
575: buffer_put_int(&e->output, buffer_len(&msg));
576: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
577: buffer_free(&msg);
578: }
1.59 markus 579:
580: #ifdef SMARTCARD
581: static void
582: process_add_smartcard_key (SocketEntry *e)
583: {
1.96 deraadt 584: char *sc_reader_id = NULL, *pin;
1.110 djm 585: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 586: Key **keys, *k;
1.84 markus 587: Identity *id;
1.59 markus 588: Idtab *tab;
1.75 deraadt 589:
1.87 markus 590: sc_reader_id = buffer_get_string(&e->request, NULL);
591: pin = buffer_get_string(&e->request, NULL);
1.110 djm 592:
593: while (buffer_len(&e->request)) {
594: switch (buffer_get_char(&e->request)) {
595: case SSH_AGENT_CONSTRAIN_LIFETIME:
596: death = time(NULL) + buffer_get_int(&e->request);
597: break;
598: case SSH_AGENT_CONSTRAIN_CONFIRM:
599: confirm = 1;
600: break;
601: default:
602: break;
603: }
604: }
605: if (lifetime && !death)
606: death = time(NULL) + lifetime;
607:
1.84 markus 608: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 609: xfree(sc_reader_id);
1.83 rees 610: xfree(pin);
1.59 markus 611:
1.84 markus 612: if (keys == NULL || keys[0] == NULL) {
613: error("sc_get_keys failed");
1.59 markus 614: goto send;
615: }
1.84 markus 616: for (i = 0; keys[i] != NULL; i++) {
617: k = keys[i];
618: version = k->type == KEY_RSA1 ? 1 : 2;
619: tab = idtab_lookup(version);
620: if (lookup_identity(k, version) == NULL) {
621: id = xmalloc(sizeof(Identity));
622: id->key = k;
1.111 markus 623: id->comment = sc_get_key_label(k);
1.110 djm 624: id->death = death;
625: id->confirm = confirm;
1.84 markus 626: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
627: tab->nentries++;
628: success = 1;
629: } else {
630: key_free(k);
631: }
632: keys[i] = NULL;
1.59 markus 633: }
1.84 markus 634: xfree(keys);
1.59 markus 635: send:
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: {
1.96 deraadt 644: char *sc_reader_id = NULL, *pin;
645: int i, version, success = 0;
646: Key **keys, *k = NULL;
1.84 markus 647: Identity *id;
648: Idtab *tab;
1.59 markus 649:
1.87 markus 650: sc_reader_id = buffer_get_string(&e->request, NULL);
651: pin = buffer_get_string(&e->request, NULL);
1.84 markus 652: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 653: xfree(sc_reader_id);
1.83 rees 654: xfree(pin);
1.59 markus 655:
1.84 markus 656: if (keys == NULL || keys[0] == NULL) {
657: error("sc_get_keys failed");
658: goto send;
659: }
660: for (i = 0; keys[i] != NULL; i++) {
661: k = keys[i];
662: version = k->type == KEY_RSA1 ? 1 : 2;
663: if ((id = lookup_identity(k, version)) != NULL) {
664: tab = idtab_lookup(version);
1.90 markus 665: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 666: tab->nentries--;
1.78 provos 667: free_identity(id);
1.59 markus 668: success = 1;
669: }
670: key_free(k);
1.84 markus 671: keys[i] = NULL;
1.59 markus 672: }
1.84 markus 673: xfree(keys);
674: send:
1.59 markus 675: buffer_put_int(&e->output, 1);
676: buffer_put_char(&e->output,
677: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
678: }
1.70 jakob 679: #endif /* SMARTCARD */
1.59 markus 680:
1.33 markus 681: /* dispatch incoming messages */
682:
1.55 itojun 683: static void
1.2 provos 684: process_message(SocketEntry *e)
1.1 deraadt 685: {
1.96 deraadt 686: u_int msg_len, type;
1.45 markus 687: u_char *cp;
1.89 markus 688:
689: /* kill dead keys */
690: reaper();
691:
1.21 markus 692: if (buffer_len(&e->input) < 5)
693: return; /* Incomplete message. */
1.77 stevesk 694: cp = buffer_ptr(&e->input);
1.137 djm 695: msg_len = get_u32(cp);
1.21 markus 696: if (msg_len > 256 * 1024) {
1.101 stevesk 697: close_socket(e);
1.21 markus 698: return;
699: }
700: if (buffer_len(&e->input) < msg_len + 4)
701: return;
1.87 markus 702:
703: /* move the current input to e->request */
1.21 markus 704: buffer_consume(&e->input, 4);
1.87 markus 705: buffer_clear(&e->request);
706: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
707: buffer_consume(&e->input, msg_len);
708: type = buffer_get_char(&e->request);
1.21 markus 709:
1.88 markus 710: /* check wheter agent is locked */
711: if (locked && type != SSH_AGENTC_UNLOCK) {
712: buffer_clear(&e->request);
713: switch (type) {
714: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
715: case SSH2_AGENTC_REQUEST_IDENTITIES:
716: /* send empty lists */
717: no_identities(e, type);
718: break;
719: default:
720: /* send a fail message for all other request types */
721: buffer_put_int(&e->output, 1);
722: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
723: }
724: return;
725: }
726:
1.59 markus 727: debug("type %d", type);
1.21 markus 728: switch (type) {
1.88 markus 729: case SSH_AGENTC_LOCK:
730: case SSH_AGENTC_UNLOCK:
731: process_lock_agent(e, type == SSH_AGENTC_LOCK);
732: break;
1.33 markus 733: /* ssh1 */
734: case SSH_AGENTC_RSA_CHALLENGE:
735: process_authentication_challenge1(e);
736: break;
1.21 markus 737: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 738: process_request_identities(e, 1);
1.21 markus 739: break;
740: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 741: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 742: process_add_identity(e, 1);
1.21 markus 743: break;
744: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 745: process_remove_identity(e, 1);
1.21 markus 746: break;
747: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 748: process_remove_all_identities(e, 1);
749: break;
750: /* ssh2 */
751: case SSH2_AGENTC_SIGN_REQUEST:
752: process_sign_request2(e);
753: break;
754: case SSH2_AGENTC_REQUEST_IDENTITIES:
755: process_request_identities(e, 2);
756: break;
757: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 758: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 759: process_add_identity(e, 2);
760: break;
761: case SSH2_AGENTC_REMOVE_IDENTITY:
762: process_remove_identity(e, 2);
763: break;
764: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
765: process_remove_all_identities(e, 2);
1.21 markus 766: break;
1.59 markus 767: #ifdef SMARTCARD
768: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 769: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 770: process_add_smartcard_key(e);
1.75 deraadt 771: break;
1.59 markus 772: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
773: process_remove_smartcard_key(e);
1.75 deraadt 774: break;
1.70 jakob 775: #endif /* SMARTCARD */
1.21 markus 776: default:
777: /* Unknown message. Respond with failure. */
778: error("Unknown message %d", type);
1.87 markus 779: buffer_clear(&e->request);
1.21 markus 780: buffer_put_int(&e->output, 1);
781: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
782: break;
783: }
1.1 deraadt 784: }
785:
1.55 itojun 786: static void
1.73 stevesk 787: new_socket(sock_type type, int fd)
1.1 deraadt 788: {
1.112 markus 789: u_int i, old_alloc, new_alloc;
1.96 deraadt 790:
1.119 djm 791: set_nonblock(fd);
1.21 markus 792:
793: if (fd > max_fd)
794: max_fd = fd;
795:
796: for (i = 0; i < sockets_alloc; i++)
797: if (sockets[i].type == AUTH_UNUSED) {
798: sockets[i].fd = fd;
799: buffer_init(&sockets[i].input);
800: buffer_init(&sockets[i].output);
1.87 markus 801: buffer_init(&sockets[i].request);
1.112 markus 802: sockets[i].type = type;
1.21 markus 803: return;
804: }
805: old_alloc = sockets_alloc;
1.112 markus 806: new_alloc = sockets_alloc + 10;
1.133 djm 807: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 808: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 809: sockets[i].type = AUTH_UNUSED;
1.112 markus 810: sockets_alloc = new_alloc;
1.21 markus 811: sockets[old_alloc].fd = fd;
812: buffer_init(&sockets[old_alloc].input);
813: buffer_init(&sockets[old_alloc].output);
1.87 markus 814: buffer_init(&sockets[old_alloc].request);
1.112 markus 815: sockets[old_alloc].type = type;
1.1 deraadt 816: }
817:
1.55 itojun 818: static int
1.120 avsm 819: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 820: {
1.46 markus 821: u_int i, sz;
822: int n = 0;
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) {
1.46 markus 840: if (*fdrp)
1.54 stevesk 841: xfree(*fdrp);
1.46 markus 842: if (*fdwp)
1.54 stevesk 843: xfree(*fdwp);
1.46 markus 844: *fdrp = xmalloc(sz);
845: *fdwp = xmalloc(sz);
1.66 markus 846: *nallocp = sz;
1.46 markus 847: }
1.66 markus 848: if (n < *fdl)
849: debug("XXX shrink: %d < %d", n, *fdl);
850: *fdl = n;
1.46 markus 851: memset(*fdrp, 0, sz);
852: memset(*fdwp, 0, sz);
853:
854: for (i = 0; i < sockets_alloc; i++) {
855: switch (sockets[i].type) {
856: case AUTH_SOCKET:
857: case AUTH_CONNECTION:
858: FD_SET(sockets[i].fd, *fdrp);
859: if (buffer_len(&sockets[i].output) > 0)
860: FD_SET(sockets[i].fd, *fdwp);
861: break;
862: default:
863: break;
864: }
865: }
866: return (1);
1.21 markus 867: }
868:
1.55 itojun 869: static void
1.21 markus 870: after_select(fd_set *readset, fd_set *writeset)
871: {
1.96 deraadt 872: struct sockaddr_un sunaddr;
1.26 markus 873: socklen_t slen;
1.21 markus 874: char buf[1024];
1.96 deraadt 875: int len, sock;
876: u_int i;
1.103 markus 877: uid_t euid;
878: gid_t egid;
1.21 markus 879:
880: for (i = 0; i < sockets_alloc; i++)
881: switch (sockets[i].type) {
882: case AUTH_UNUSED:
883: break;
884: case AUTH_SOCKET:
885: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 886: slen = sizeof(sunaddr);
1.46 markus 887: sock = accept(sockets[i].fd,
1.131 deraadt 888: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 889: if (sock < 0) {
1.81 stevesk 890: error("accept from AUTH_SOCKET: %s",
891: strerror(errno));
1.103 markus 892: break;
893: }
894: if (getpeereid(sock, &euid, &egid) < 0) {
895: error("getpeereid %d failed: %s",
896: sock, strerror(errno));
897: close(sock);
898: break;
899: }
1.105 markus 900: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 901: error("uid mismatch: "
1.104 stevesk 902: "peer euid %u != uid %u",
903: (u_int) euid, (u_int) getuid());
1.103 markus 904: close(sock);
1.21 markus 905: break;
906: }
907: new_socket(AUTH_CONNECTION, sock);
908: }
909: break;
910: case AUTH_CONNECTION:
911: if (buffer_len(&sockets[i].output) > 0 &&
912: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 913: do {
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;
920: break;
921: } while (1);
1.21 markus 922: if (len <= 0) {
1.101 stevesk 923: close_socket(&sockets[i]);
1.21 markus 924: break;
925: }
926: buffer_consume(&sockets[i].output, len);
927: }
928: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 929: do {
930: len = read(sockets[i].fd, buf, sizeof(buf));
931: if (len == -1 && (errno == EAGAIN ||
932: errno == EINTR))
933: continue;
934: break;
935: } while (1);
1.21 markus 936: if (len <= 0) {
1.101 stevesk 937: close_socket(&sockets[i]);
1.21 markus 938: break;
939: }
940: buffer_append(&sockets[i].input, buf, len);
941: process_message(&sockets[i]);
942: }
943: break;
944: default:
945: fatal("Unknown type %d", sockets[i].type);
946: }
1.1 deraadt 947: }
948:
1.55 itojun 949: static void
1.113 markus 950: cleanup_socket(void)
1.15 markus 951: {
1.48 deraadt 952: if (socket_name[0])
953: unlink(socket_name);
954: if (socket_dir[0])
955: rmdir(socket_dir);
1.10 markus 956: }
957:
1.114 markus 958: void
1.15 markus 959: cleanup_exit(int i)
960: {
1.113 markus 961: cleanup_socket();
962: _exit(i);
1.15 markus 963: }
964:
1.135 deraadt 965: /*ARGSUSED*/
1.55 itojun 966: static void
1.48 deraadt 967: cleanup_handler(int sig)
968: {
1.113 markus 969: cleanup_socket();
1.48 deraadt 970: _exit(2);
1.113 markus 971: }
972:
1.135 deraadt 973: /*ARGSUSED*/
1.68 markus 974: static void
975: check_parent_exists(int sig)
976: {
977: int save_errno = errno;
978:
979: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
980: /* printf("Parent has died - Authentication agent exiting.\n"); */
981: cleanup_handler(sig); /* safe */
982: }
983: signal(SIGALRM, check_parent_exists);
984: alarm(10);
985: errno = save_errno;
1.48 deraadt 986: }
987:
1.55 itojun 988: static void
1.50 itojun 989: usage(void)
1.15 markus 990: {
1.72 jakob 991: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 992: __progname);
1.72 jakob 993: fprintf(stderr, "Options:\n");
994: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
995: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
996: fprintf(stderr, " -k Kill the current agent.\n");
997: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 998: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 999: fprintf(stderr, " -t life Default identity lifetime (seconds).\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;
1.120 avsm 1007: int sock, fd, ch;
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];
1.123 djm 1017:
1018: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1019: sanitise_stdfd();
1.99 markus 1020:
1021: /* drop */
1022: setegid(getgid());
1023: setgid(getgid());
1.53 markus 1024:
1025: SSLeay_add_all_algorithms();
1.21 markus 1026:
1.106 marc 1027: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1028: switch (ch) {
1029: case 'c':
1030: if (s_flag)
1031: usage();
1032: c_flag++;
1033: break;
1034: case 'k':
1035: k_flag++;
1036: break;
1037: case 's':
1038: if (c_flag)
1039: usage();
1040: s_flag++;
1041: break;
1.57 markus 1042: case 'd':
1043: if (d_flag)
1044: usage();
1045: d_flag++;
1046: break;
1.86 markus 1047: case 'a':
1048: agentsocket = optarg;
1.106 marc 1049: break;
1050: case 't':
1051: if ((lifetime = convtime(optarg)) == -1) {
1052: fprintf(stderr, "Invalid lifetime\n");
1053: usage();
1054: }
1.86 markus 1055: break;
1.21 markus 1056: default:
1057: usage();
1058: }
1059: }
1060: ac -= optind;
1061: av += optind;
1062:
1.57 markus 1063: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1064: usage();
1065:
1.85 markus 1066: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1067: shell = getenv("SHELL");
1.136 deraadt 1068: if (shell != NULL &&
1069: strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1.21 markus 1070: c_flag = 1;
1071: }
1072: if (k_flag) {
1.136 deraadt 1073: const char *errstr = NULL;
1074:
1.21 markus 1075: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1076: if (pidstr == NULL) {
1077: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1078: SSH_AGENTPID_ENV_NAME);
1.21 markus 1079: exit(1);
1080: }
1.136 deraadt 1081: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1082: if (errstr) {
1083: fprintf(stderr,
1084: "%s=\"%s\", which is not a good PID: %s\n",
1085: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1086: exit(1);
1087: }
1088: if (kill(pid, SIGTERM) == -1) {
1089: perror("kill");
1090: exit(1);
1091: }
1092: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1093: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1094: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1095: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1096: exit(0);
1097: }
1098: parent_pid = getpid();
1099:
1.86 markus 1100: if (agentsocket == NULL) {
1101: /* Create private directory for agent socket */
1.115 markus 1102: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1103: if (mkdtemp(socket_dir) == NULL) {
1104: perror("mkdtemp: private socket dir");
1105: exit(1);
1106: }
1.91 mpech 1107: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1108: (long)parent_pid);
1.86 markus 1109: } else {
1110: /* Try to use specified agent socket */
1111: socket_dir[0] = '\0';
1112: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1113: }
1114:
1.23 markus 1115: /*
1116: * Create socket early so it will exist before command gets run from
1117: * the parent.
1118: */
1.21 markus 1119: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1120: if (sock < 0) {
1121: perror("socket");
1.121 djm 1122: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1123: cleanup_exit(1);
1124: }
1125: memset(&sunaddr, 0, sizeof(sunaddr));
1126: sunaddr.sun_family = AF_UNIX;
1127: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1128: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1129: perror("bind");
1.121 djm 1130: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1131: cleanup_exit(1);
1132: }
1.117 markus 1133: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1134: perror("listen");
1135: cleanup_exit(1);
1136: }
1.46 markus 1137:
1.23 markus 1138: /*
1139: * Fork, and have the parent execute the command, if any, or present
1140: * the socket data. The child continues as the authentication agent.
1141: */
1.57 markus 1142: if (d_flag) {
1143: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1144: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1145: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1146: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1147: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1148: goto skip;
1149: }
1.21 markus 1150: pid = fork();
1151: if (pid == -1) {
1152: perror("fork");
1.81 stevesk 1153: cleanup_exit(1);
1.21 markus 1154: }
1155: if (pid != 0) { /* Parent - execute the given command. */
1156: close(sock);
1.91 mpech 1157: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1158: if (ac == 0) {
1159: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1160: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1161: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1162: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1163: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1164: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1165: exit(0);
1166: }
1.36 deraadt 1167: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1168: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1169: perror("setenv");
1170: exit(1);
1171: }
1.21 markus 1172: execvp(av[0], av);
1173: perror(av[0]);
1174: exit(1);
1175: }
1.81 stevesk 1176: /* child */
1177: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1178:
1179: if (setsid() == -1) {
1.81 stevesk 1180: error("setsid: %s", strerror(errno));
1.67 stevesk 1181: cleanup_exit(1);
1182: }
1183:
1184: (void)chdir("/");
1.107 markus 1185: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1186: /* XXX might close listen socket */
1187: (void)dup2(fd, STDIN_FILENO);
1188: (void)dup2(fd, STDOUT_FILENO);
1189: (void)dup2(fd, STDERR_FILENO);
1190: if (fd > 2)
1191: close(fd);
1192: }
1.21 markus 1193:
1.41 markus 1194: /* deny core dumps, since memory contains unencrypted private keys */
1195: rlim.rlim_cur = rlim.rlim_max = 0;
1196: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1197: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1198: cleanup_exit(1);
1199: }
1.57 markus 1200:
1201: skip:
1.21 markus 1202: new_socket(AUTH_SOCKET, sock);
1203: if (ac > 0) {
1204: signal(SIGALRM, check_parent_exists);
1205: alarm(10);
1206: }
1.33 markus 1207: idtab_init();
1.61 markus 1208: if (!d_flag)
1.57 markus 1209: signal(SIGINT, SIG_IGN);
1.61 markus 1210: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1211: signal(SIGHUP, cleanup_handler);
1212: signal(SIGTERM, cleanup_handler);
1.66 markus 1213: nalloc = 0;
1214:
1.21 markus 1215: while (1) {
1.66 markus 1216: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1217: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1218: if (errno == EINTR)
1219: continue;
1.81 stevesk 1220: fatal("select: %s", strerror(errno));
1.21 markus 1221: }
1.46 markus 1222: after_select(readsetp, writesetp);
1.15 markus 1223: }
1.21 markus 1224: /* NOTREACHED */
1.1 deraadt 1225: }
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