Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.154
1.154 ! dtucker 1: /* $OpenBSD: ssh-agent.c,v 1.153 2006/10/06 02:29:19 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: #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:
1.59 markus 69: #ifdef SMARTCARD
70: #include "scard.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;
1.89 markus 94: u_int death;
1.107 markus 95: u_int confirm;
1.1 deraadt 96: } Identity;
97:
1.33 markus 98: typedef struct {
99: int nentries;
1.78 provos 100: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 101: } Idtab;
102:
103: /* private key table, one per protocol version */
104: Idtab idtable[3];
1.1 deraadt 105:
106: int max_fd = 0;
107:
1.11 markus 108: /* pid of shell == parent of agent */
1.29 deraadt 109: pid_t parent_pid = -1;
1.10 markus 110:
111: /* pathname and directory for AUTH_SOCKET */
1.132 djm 112: char socket_name[MAXPATHLEN];
113: char socket_dir[MAXPATHLEN];
1.10 markus 114:
1.88 markus 115: /* locking */
116: int locked = 0;
117: char *lock_passwd = NULL;
118:
1.20 markus 119: extern char *__progname;
120:
1.106 marc 121: /* Default lifetime (0 == forever) */
122: static int lifetime = 0;
123:
1.55 itojun 124: static void
1.101 stevesk 125: close_socket(SocketEntry *e)
126: {
127: close(e->fd);
128: e->fd = -1;
129: e->type = AUTH_UNUSED;
130: buffer_free(&e->input);
131: buffer_free(&e->output);
132: buffer_free(&e->request);
133: }
134:
135: static void
1.33 markus 136: idtab_init(void)
1.1 deraadt 137: {
1.33 markus 138: int i;
1.96 deraadt 139:
1.74 deraadt 140: for (i = 0; i <=2; i++) {
1.78 provos 141: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 142: idtable[i].nentries = 0;
143: }
144: }
145:
146: /* return private key table for requested protocol version */
1.55 itojun 147: static Idtab *
1.33 markus 148: idtab_lookup(int version)
149: {
150: if (version < 1 || version > 2)
151: fatal("internal error, bad protocol version %d", version);
152: return &idtable[version];
153: }
154:
1.89 markus 155: static void
156: free_identity(Identity *id)
157: {
158: key_free(id->key);
159: xfree(id->comment);
160: xfree(id);
161: }
162:
1.33 markus 163: /* return matching private key for given public key */
1.78 provos 164: static Identity *
165: lookup_identity(Key *key, int version)
1.33 markus 166: {
1.78 provos 167: Identity *id;
168:
1.33 markus 169: Idtab *tab = idtab_lookup(version);
1.78 provos 170: TAILQ_FOREACH(id, &tab->idlist, next) {
171: if (key_equal(key, id->key))
172: return (id);
1.33 markus 173: }
1.78 provos 174: return (NULL);
175: }
176:
1.107 markus 177: /* Check confirmation of keysign request */
178: static int
179: confirm_key(Identity *id)
180: {
1.122 djm 181: char *p;
1.107 markus 182: int ret = -1;
183:
184: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 185: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
186: id->comment, p))
187: ret = 0;
1.107 markus 188: xfree(p);
1.122 djm 189:
1.107 markus 190: return (ret);
191: }
192:
1.33 markus 193: /* send list of supported public keys to 'client' */
1.55 itojun 194: static void
1.33 markus 195: process_request_identities(SocketEntry *e, int version)
196: {
197: Idtab *tab = idtab_lookup(version);
1.96 deraadt 198: Identity *id;
1.21 markus 199: Buffer msg;
1.1 deraadt 200:
1.21 markus 201: buffer_init(&msg);
1.33 markus 202: buffer_put_char(&msg, (version == 1) ?
203: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
204: buffer_put_int(&msg, tab->nentries);
1.78 provos 205: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 206: if (id->key->type == KEY_RSA1) {
1.33 markus 207: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
208: buffer_put_bignum(&msg, id->key->rsa->e);
209: buffer_put_bignum(&msg, id->key->rsa->n);
210: } else {
1.45 markus 211: u_char *blob;
212: u_int blen;
1.39 markus 213: key_to_blob(id->key, &blob, &blen);
1.33 markus 214: buffer_put_string(&msg, blob, blen);
215: xfree(blob);
216: }
217: buffer_put_cstring(&msg, id->comment);
1.21 markus 218: }
219: buffer_put_int(&e->output, buffer_len(&msg));
220: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
221: buffer_free(&msg);
1.1 deraadt 222: }
223:
1.33 markus 224: /* ssh1 only */
1.55 itojun 225: static void
1.33 markus 226: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 227: {
1.96 deraadt 228: u_char buf[32], mdbuf[16], session_id[16];
229: u_int response_type;
230: BIGNUM *challenge;
1.78 provos 231: Identity *id;
1.33 markus 232: int i, len;
1.21 markus 233: Buffer msg;
234: MD5_CTX md;
1.96 deraadt 235: Key *key;
1.21 markus 236:
237: buffer_init(&msg);
1.39 markus 238: key = key_new(KEY_RSA1);
1.76 markus 239: if ((challenge = BN_new()) == NULL)
240: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 241:
1.97 markus 242: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 243: buffer_get_bignum(&e->request, key->rsa->e);
244: buffer_get_bignum(&e->request, key->rsa->n);
245: buffer_get_bignum(&e->request, challenge);
1.21 markus 246:
1.33 markus 247: /* Only protocol 1.1 is supported */
1.87 markus 248: if (buffer_len(&e->request) == 0)
1.33 markus 249: goto failure;
1.87 markus 250: buffer_get(&e->request, session_id, 16);
251: response_type = buffer_get_int(&e->request);
1.33 markus 252: if (response_type != 1)
253: goto failure;
254:
1.78 provos 255: id = lookup_identity(key, 1);
1.107 markus 256: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 257: Key *private = id->key;
1.33 markus 258: /* Decrypt the challenge using the private key. */
1.49 markus 259: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
260: goto failure;
1.33 markus 261:
262: /* The response is MD5 of decrypted challenge plus session id. */
263: len = BN_num_bytes(challenge);
264: if (len <= 0 || len > 32) {
1.109 itojun 265: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 266: goto failure;
267: }
268: memset(buf, 0, 32);
269: BN_bn2bin(challenge, buf + 32 - len);
270: MD5_Init(&md);
271: MD5_Update(&md, buf, 32);
272: MD5_Update(&md, session_id, 16);
273: MD5_Final(mdbuf, &md);
274:
275: /* Send the response. */
276: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
277: for (i = 0; i < 16; i++)
278: buffer_put_char(&msg, mdbuf[i]);
279: goto send;
280: }
1.21 markus 281:
1.33 markus 282: failure:
283: /* Unknown identity or protocol error. Send failure. */
1.21 markus 284: buffer_put_char(&msg, SSH_AGENT_FAILURE);
285: send:
286: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 287: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
288: key_free(key);
289: BN_clear_free(challenge);
290: buffer_free(&msg);
291: }
292:
293: /* ssh2 only */
1.55 itojun 294: static void
1.33 markus 295: process_sign_request2(SocketEntry *e)
296: {
1.45 markus 297: u_char *blob, *data, *signature = NULL;
298: u_int blen, dlen, slen = 0;
1.96 deraadt 299: extern int datafellows;
300: int ok = -1, flags;
1.33 markus 301: Buffer msg;
1.96 deraadt 302: Key *key;
1.33 markus 303:
304: datafellows = 0;
1.43 markus 305:
1.87 markus 306: blob = buffer_get_string(&e->request, &blen);
307: data = buffer_get_string(&e->request, &dlen);
1.37 markus 308:
1.87 markus 309: flags = buffer_get_int(&e->request);
1.37 markus 310: if (flags & SSH_AGENT_OLD_SIGNATURE)
311: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 312:
1.39 markus 313: key = key_from_blob(blob, blen);
1.33 markus 314: if (key != NULL) {
1.78 provos 315: Identity *id = lookup_identity(key, 2);
1.107 markus 316: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 317: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 318: key_free(key);
1.33 markus 319: }
320: buffer_init(&msg);
321: if (ok == 0) {
322: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
323: buffer_put_string(&msg, signature, slen);
324: } else {
325: buffer_put_char(&msg, SSH_AGENT_FAILURE);
326: }
327: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 328: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 329: buffer_len(&msg));
1.21 markus 330: buffer_free(&msg);
1.33 markus 331: xfree(data);
332: xfree(blob);
333: if (signature != NULL)
334: xfree(signature);
1.1 deraadt 335: }
336:
1.33 markus 337: /* shared */
1.55 itojun 338: static void
1.33 markus 339: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 340: {
1.96 deraadt 341: u_int blen, bits;
342: int success = 0;
1.78 provos 343: Key *key = NULL;
1.45 markus 344: u_char *blob;
1.21 markus 345:
1.74 deraadt 346: switch (version) {
1.33 markus 347: case 1:
1.39 markus 348: key = key_new(KEY_RSA1);
1.87 markus 349: bits = buffer_get_int(&e->request);
350: buffer_get_bignum(&e->request, key->rsa->e);
351: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 352:
353: if (bits != key_size(key))
1.109 itojun 354: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 355: key_size(key), bits);
1.33 markus 356: break;
357: case 2:
1.87 markus 358: blob = buffer_get_string(&e->request, &blen);
1.39 markus 359: key = key_from_blob(blob, blen);
1.33 markus 360: xfree(blob);
361: break;
362: }
363: if (key != NULL) {
1.78 provos 364: Identity *id = lookup_identity(key, version);
365: if (id != NULL) {
1.23 markus 366: /*
367: * We have this key. Free the old key. Since we
1.124 djm 368: * don't want to leave empty slots in the middle of
1.40 markus 369: * the array, we actually free the key there and move
370: * all the entries between the empty slot and the end
371: * of the array.
1.23 markus 372: */
1.33 markus 373: Idtab *tab = idtab_lookup(version);
1.38 markus 374: if (tab->nentries < 1)
375: fatal("process_remove_identity: "
376: "internal error: tab->nentries %d",
377: tab->nentries);
1.78 provos 378: TAILQ_REMOVE(&tab->idlist, id, next);
379: free_identity(id);
1.33 markus 380: tab->nentries--;
381: success = 1;
1.21 markus 382: }
1.33 markus 383: key_free(key);
384: }
1.1 deraadt 385: buffer_put_int(&e->output, 1);
1.33 markus 386: buffer_put_char(&e->output,
387: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 388: }
389:
1.55 itojun 390: static void
1.33 markus 391: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 392: {
1.33 markus 393: Idtab *tab = idtab_lookup(version);
1.78 provos 394: Identity *id;
1.21 markus 395:
396: /* Loop over all identities and clear the keys. */
1.78 provos 397: for (id = TAILQ_FIRST(&tab->idlist); id;
398: id = TAILQ_FIRST(&tab->idlist)) {
399: TAILQ_REMOVE(&tab->idlist, id, next);
400: free_identity(id);
1.21 markus 401: }
402:
403: /* Mark that there are no identities. */
1.33 markus 404: tab->nentries = 0;
1.21 markus 405:
406: /* Send success. */
407: buffer_put_int(&e->output, 1);
408: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 409: }
410:
1.55 itojun 411: static void
1.89 markus 412: reaper(void)
413: {
1.96 deraadt 414: u_int now = time(NULL);
1.89 markus 415: Identity *id, *nxt;
416: int version;
1.96 deraadt 417: Idtab *tab;
1.89 markus 418:
419: for (version = 1; version < 3; version++) {
420: tab = idtab_lookup(version);
421: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
422: nxt = TAILQ_NEXT(id, next);
423: if (id->death != 0 && now >= id->death) {
1.154 ! dtucker 424: debug("expiring key '%s'", id->comment);
1.89 markus 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:
1.21 markus 689: if (buffer_len(&e->input) < 5)
690: return; /* Incomplete message. */
1.77 stevesk 691: cp = buffer_ptr(&e->input);
1.137 djm 692: msg_len = get_u32(cp);
1.21 markus 693: if (msg_len > 256 * 1024) {
1.101 stevesk 694: close_socket(e);
1.21 markus 695: return;
696: }
697: if (buffer_len(&e->input) < msg_len + 4)
698: return;
1.87 markus 699:
700: /* move the current input to e->request */
1.21 markus 701: buffer_consume(&e->input, 4);
1.87 markus 702: buffer_clear(&e->request);
703: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
704: buffer_consume(&e->input, msg_len);
705: type = buffer_get_char(&e->request);
1.21 markus 706:
1.88 markus 707: /* check wheter agent is locked */
708: if (locked && type != SSH_AGENTC_UNLOCK) {
709: buffer_clear(&e->request);
710: switch (type) {
711: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
712: case SSH2_AGENTC_REQUEST_IDENTITIES:
713: /* send empty lists */
714: no_identities(e, type);
715: break;
716: default:
717: /* send a fail message for all other request types */
718: buffer_put_int(&e->output, 1);
719: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
720: }
721: return;
722: }
723:
1.59 markus 724: debug("type %d", type);
1.21 markus 725: switch (type) {
1.88 markus 726: case SSH_AGENTC_LOCK:
727: case SSH_AGENTC_UNLOCK:
728: process_lock_agent(e, type == SSH_AGENTC_LOCK);
729: break;
1.33 markus 730: /* ssh1 */
731: case SSH_AGENTC_RSA_CHALLENGE:
732: process_authentication_challenge1(e);
733: break;
1.21 markus 734: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 735: process_request_identities(e, 1);
1.21 markus 736: break;
737: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 738: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 739: process_add_identity(e, 1);
1.21 markus 740: break;
741: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 742: process_remove_identity(e, 1);
1.21 markus 743: break;
744: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 745: process_remove_all_identities(e, 1);
746: break;
747: /* ssh2 */
748: case SSH2_AGENTC_SIGN_REQUEST:
749: process_sign_request2(e);
750: break;
751: case SSH2_AGENTC_REQUEST_IDENTITIES:
752: process_request_identities(e, 2);
753: break;
754: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 755: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 756: process_add_identity(e, 2);
757: break;
758: case SSH2_AGENTC_REMOVE_IDENTITY:
759: process_remove_identity(e, 2);
760: break;
761: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
762: process_remove_all_identities(e, 2);
1.21 markus 763: break;
1.59 markus 764: #ifdef SMARTCARD
765: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 766: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 767: process_add_smartcard_key(e);
1.75 deraadt 768: break;
1.59 markus 769: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
770: process_remove_smartcard_key(e);
1.75 deraadt 771: break;
1.70 jakob 772: #endif /* SMARTCARD */
1.21 markus 773: default:
774: /* Unknown message. Respond with failure. */
775: error("Unknown message %d", type);
1.87 markus 776: buffer_clear(&e->request);
1.21 markus 777: buffer_put_int(&e->output, 1);
778: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
779: break;
780: }
1.1 deraadt 781: }
782:
1.55 itojun 783: static void
1.73 stevesk 784: new_socket(sock_type type, int fd)
1.1 deraadt 785: {
1.112 markus 786: u_int i, old_alloc, new_alloc;
1.96 deraadt 787:
1.119 djm 788: set_nonblock(fd);
1.21 markus 789:
790: if (fd > max_fd)
791: max_fd = fd;
792:
793: for (i = 0; i < sockets_alloc; i++)
794: if (sockets[i].type == AUTH_UNUSED) {
795: sockets[i].fd = fd;
796: buffer_init(&sockets[i].input);
797: buffer_init(&sockets[i].output);
1.87 markus 798: buffer_init(&sockets[i].request);
1.112 markus 799: sockets[i].type = type;
1.21 markus 800: return;
801: }
802: old_alloc = sockets_alloc;
1.112 markus 803: new_alloc = sockets_alloc + 10;
1.133 djm 804: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 805: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 806: sockets[i].type = AUTH_UNUSED;
1.112 markus 807: sockets_alloc = new_alloc;
1.21 markus 808: sockets[old_alloc].fd = fd;
809: buffer_init(&sockets[old_alloc].input);
810: buffer_init(&sockets[old_alloc].output);
1.87 markus 811: buffer_init(&sockets[old_alloc].request);
1.112 markus 812: sockets[old_alloc].type = type;
1.1 deraadt 813: }
814:
1.55 itojun 815: static int
1.120 avsm 816: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 817: {
1.46 markus 818: u_int i, sz;
819: int n = 0;
820:
821: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 822: switch (sockets[i].type) {
823: case AUTH_SOCKET:
824: case AUTH_CONNECTION:
1.46 markus 825: n = MAX(n, sockets[i].fd);
1.21 markus 826: break;
827: case AUTH_UNUSED:
828: break;
829: default:
830: fatal("Unknown socket type %d", sockets[i].type);
831: break;
832: }
1.46 markus 833: }
834:
835: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 836: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 837: if (*fdrp)
1.54 stevesk 838: xfree(*fdrp);
1.46 markus 839: if (*fdwp)
1.54 stevesk 840: xfree(*fdwp);
1.46 markus 841: *fdrp = xmalloc(sz);
842: *fdwp = xmalloc(sz);
1.66 markus 843: *nallocp = sz;
1.46 markus 844: }
1.66 markus 845: if (n < *fdl)
846: debug("XXX shrink: %d < %d", n, *fdl);
847: *fdl = n;
1.46 markus 848: memset(*fdrp, 0, sz);
849: memset(*fdwp, 0, sz);
850:
851: for (i = 0; i < sockets_alloc; i++) {
852: switch (sockets[i].type) {
853: case AUTH_SOCKET:
854: case AUTH_CONNECTION:
855: FD_SET(sockets[i].fd, *fdrp);
856: if (buffer_len(&sockets[i].output) > 0)
857: FD_SET(sockets[i].fd, *fdwp);
858: break;
859: default:
860: break;
861: }
862: }
863: return (1);
1.21 markus 864: }
865:
1.55 itojun 866: static void
1.21 markus 867: after_select(fd_set *readset, fd_set *writeset)
868: {
1.96 deraadt 869: struct sockaddr_un sunaddr;
1.26 markus 870: socklen_t slen;
1.21 markus 871: char buf[1024];
1.96 deraadt 872: int len, sock;
873: u_int i;
1.103 markus 874: uid_t euid;
875: gid_t egid;
1.21 markus 876:
877: for (i = 0; i < sockets_alloc; i++)
878: switch (sockets[i].type) {
879: case AUTH_UNUSED:
880: break;
881: case AUTH_SOCKET:
882: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 883: slen = sizeof(sunaddr);
1.46 markus 884: sock = accept(sockets[i].fd,
1.131 deraadt 885: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 886: if (sock < 0) {
1.81 stevesk 887: error("accept from AUTH_SOCKET: %s",
888: strerror(errno));
1.103 markus 889: break;
890: }
891: if (getpeereid(sock, &euid, &egid) < 0) {
892: error("getpeereid %d failed: %s",
893: sock, strerror(errno));
894: close(sock);
895: break;
896: }
1.105 markus 897: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 898: error("uid mismatch: "
1.104 stevesk 899: "peer euid %u != uid %u",
900: (u_int) euid, (u_int) getuid());
1.103 markus 901: close(sock);
1.21 markus 902: break;
903: }
904: new_socket(AUTH_CONNECTION, sock);
905: }
906: break;
907: case AUTH_CONNECTION:
908: if (buffer_len(&sockets[i].output) > 0 &&
909: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 910: do {
911: len = write(sockets[i].fd,
912: buffer_ptr(&sockets[i].output),
913: buffer_len(&sockets[i].output));
914: if (len == -1 && (errno == EAGAIN ||
915: errno == EINTR))
916: continue;
917: break;
918: } while (1);
1.21 markus 919: if (len <= 0) {
1.101 stevesk 920: close_socket(&sockets[i]);
1.21 markus 921: break;
922: }
923: buffer_consume(&sockets[i].output, len);
924: }
925: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 926: do {
927: len = read(sockets[i].fd, buf, sizeof(buf));
928: if (len == -1 && (errno == EAGAIN ||
929: errno == EINTR))
930: continue;
931: break;
932: } while (1);
1.21 markus 933: if (len <= 0) {
1.101 stevesk 934: close_socket(&sockets[i]);
1.21 markus 935: break;
936: }
937: buffer_append(&sockets[i].input, buf, len);
938: process_message(&sockets[i]);
939: }
940: break;
941: default:
942: fatal("Unknown type %d", sockets[i].type);
943: }
1.1 deraadt 944: }
945:
1.55 itojun 946: static void
1.113 markus 947: cleanup_socket(void)
1.15 markus 948: {
1.48 deraadt 949: if (socket_name[0])
950: unlink(socket_name);
951: if (socket_dir[0])
952: rmdir(socket_dir);
1.10 markus 953: }
954:
1.114 markus 955: void
1.15 markus 956: cleanup_exit(int i)
957: {
1.113 markus 958: cleanup_socket();
959: _exit(i);
1.15 markus 960: }
961:
1.135 deraadt 962: /*ARGSUSED*/
1.55 itojun 963: static void
1.48 deraadt 964: cleanup_handler(int sig)
965: {
1.113 markus 966: cleanup_socket();
1.48 deraadt 967: _exit(2);
1.113 markus 968: }
969:
1.135 deraadt 970: /*ARGSUSED*/
1.68 markus 971: static void
972: check_parent_exists(int sig)
973: {
974: int save_errno = errno;
975:
976: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
977: /* printf("Parent has died - Authentication agent exiting.\n"); */
978: cleanup_handler(sig); /* safe */
979: }
980: signal(SIGALRM, check_parent_exists);
981: alarm(10);
982: errno = save_errno;
1.48 deraadt 983: }
984:
1.55 itojun 985: static void
1.50 itojun 986: usage(void)
1.15 markus 987: {
1.72 jakob 988: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 989: __progname);
1.72 jakob 990: fprintf(stderr, "Options:\n");
991: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
992: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
993: fprintf(stderr, " -k Kill the current agent.\n");
994: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 995: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 996: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 997: exit(1);
1.15 markus 998: }
999:
1.2 provos 1000: int
1001: main(int ac, char **av)
1.1 deraadt 1002: {
1.107 markus 1003: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 ! dtucker 1004: int sock, fd, ch, result, saved_errno;
1.120 avsm 1005: u_int nalloc;
1.96 deraadt 1006: char *shell, *format, *pidstr, *agentsocket = NULL;
1007: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1008: struct sockaddr_un sunaddr;
1.41 markus 1009: struct rlimit rlim;
1.96 deraadt 1010: extern int optind;
1.98 stevesk 1011: extern char *optarg;
1.21 markus 1012: pid_t pid;
1.96 deraadt 1013: char pidstrbuf[1 + 3 * sizeof pid];
1.154 ! dtucker 1014: struct timeval tv;
1.123 djm 1015:
1016: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1017: sanitise_stdfd();
1.99 markus 1018:
1019: /* drop */
1020: setegid(getgid());
1021: setgid(getgid());
1.53 markus 1022:
1023: SSLeay_add_all_algorithms();
1.21 markus 1024:
1.106 marc 1025: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1026: switch (ch) {
1027: case 'c':
1028: if (s_flag)
1029: usage();
1030: c_flag++;
1031: break;
1032: case 'k':
1033: k_flag++;
1034: break;
1035: case 's':
1036: if (c_flag)
1037: usage();
1038: s_flag++;
1039: break;
1.57 markus 1040: case 'd':
1041: if (d_flag)
1042: usage();
1043: d_flag++;
1044: break;
1.86 markus 1045: case 'a':
1046: agentsocket = optarg;
1.106 marc 1047: break;
1048: case 't':
1049: if ((lifetime = convtime(optarg)) == -1) {
1050: fprintf(stderr, "Invalid lifetime\n");
1051: usage();
1052: }
1.86 markus 1053: break;
1.21 markus 1054: default:
1055: usage();
1056: }
1057: }
1058: ac -= optind;
1059: av += optind;
1060:
1.57 markus 1061: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1062: usage();
1063:
1.85 markus 1064: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1065: shell = getenv("SHELL");
1.136 deraadt 1066: if (shell != NULL &&
1067: strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1.21 markus 1068: c_flag = 1;
1069: }
1070: if (k_flag) {
1.136 deraadt 1071: const char *errstr = NULL;
1072:
1.21 markus 1073: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1074: if (pidstr == NULL) {
1075: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1076: SSH_AGENTPID_ENV_NAME);
1.21 markus 1077: exit(1);
1078: }
1.136 deraadt 1079: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1080: if (errstr) {
1081: fprintf(stderr,
1082: "%s=\"%s\", which is not a good PID: %s\n",
1083: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1084: exit(1);
1085: }
1086: if (kill(pid, SIGTERM) == -1) {
1087: perror("kill");
1088: exit(1);
1089: }
1090: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1091: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1092: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1093: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1094: exit(0);
1095: }
1096: parent_pid = getpid();
1097:
1.86 markus 1098: if (agentsocket == NULL) {
1099: /* Create private directory for agent socket */
1.115 markus 1100: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1101: if (mkdtemp(socket_dir) == NULL) {
1102: perror("mkdtemp: private socket dir");
1103: exit(1);
1104: }
1.91 mpech 1105: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1106: (long)parent_pid);
1.86 markus 1107: } else {
1108: /* Try to use specified agent socket */
1109: socket_dir[0] = '\0';
1110: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1111: }
1112:
1.23 markus 1113: /*
1114: * Create socket early so it will exist before command gets run from
1115: * the parent.
1116: */
1.21 markus 1117: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1118: if (sock < 0) {
1119: perror("socket");
1.121 djm 1120: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1121: cleanup_exit(1);
1122: }
1123: memset(&sunaddr, 0, sizeof(sunaddr));
1124: sunaddr.sun_family = AF_UNIX;
1125: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1126: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1127: perror("bind");
1.121 djm 1128: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1129: cleanup_exit(1);
1130: }
1.117 markus 1131: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1132: perror("listen");
1133: cleanup_exit(1);
1134: }
1.46 markus 1135:
1.23 markus 1136: /*
1137: * Fork, and have the parent execute the command, if any, or present
1138: * the socket data. The child continues as the authentication agent.
1139: */
1.57 markus 1140: if (d_flag) {
1141: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1142: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1143: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1144: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1145: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1146: goto skip;
1147: }
1.21 markus 1148: pid = fork();
1149: if (pid == -1) {
1150: perror("fork");
1.81 stevesk 1151: cleanup_exit(1);
1.21 markus 1152: }
1153: if (pid != 0) { /* Parent - execute the given command. */
1154: close(sock);
1.91 mpech 1155: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1156: if (ac == 0) {
1157: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1158: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1159: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1160: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1161: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1162: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1163: exit(0);
1164: }
1.36 deraadt 1165: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1166: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1167: perror("setenv");
1168: exit(1);
1169: }
1.21 markus 1170: execvp(av[0], av);
1171: perror(av[0]);
1172: exit(1);
1173: }
1.81 stevesk 1174: /* child */
1175: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1176:
1177: if (setsid() == -1) {
1.81 stevesk 1178: error("setsid: %s", strerror(errno));
1.67 stevesk 1179: cleanup_exit(1);
1180: }
1181:
1182: (void)chdir("/");
1.107 markus 1183: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1184: /* XXX might close listen socket */
1185: (void)dup2(fd, STDIN_FILENO);
1186: (void)dup2(fd, STDOUT_FILENO);
1187: (void)dup2(fd, STDERR_FILENO);
1188: if (fd > 2)
1189: close(fd);
1190: }
1.21 markus 1191:
1.41 markus 1192: /* deny core dumps, since memory contains unencrypted private keys */
1193: rlim.rlim_cur = rlim.rlim_max = 0;
1194: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1195: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1196: cleanup_exit(1);
1197: }
1.57 markus 1198:
1199: skip:
1.21 markus 1200: new_socket(AUTH_SOCKET, sock);
1201: if (ac > 0) {
1202: signal(SIGALRM, check_parent_exists);
1203: alarm(10);
1204: }
1.33 markus 1205: idtab_init();
1.61 markus 1206: if (!d_flag)
1.57 markus 1207: signal(SIGINT, SIG_IGN);
1.61 markus 1208: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1209: signal(SIGHUP, cleanup_handler);
1210: signal(SIGTERM, cleanup_handler);
1.66 markus 1211: nalloc = 0;
1212:
1.21 markus 1213: while (1) {
1.154 ! dtucker 1214: tv.tv_sec = 10;
! 1215: tv.tv_usec = 0;
1.66 markus 1216: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.154 ! dtucker 1217: result = select(max_fd + 1, readsetp, writesetp, NULL, &tv);
! 1218: saved_errno = errno;
! 1219: reaper(); /* remove expired keys */
! 1220: if (result < 0) {
! 1221: if (saved_errno == EINTR)
1.21 markus 1222: continue;
1.154 ! dtucker 1223: fatal("select: %s", strerror(saved_errno));
! 1224: } else if (result > 0)
! 1225: after_select(readsetp, writesetp);
1.15 markus 1226: }
1.21 markus 1227: /* NOTREACHED */
1.1 deraadt 1228: }
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