Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.141
1.141 ! stevesk 1: /* $OpenBSD: ssh-agent.c,v 1.140 2006/06/13 02:17:07 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:
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>
1.126 stevesk 44:
45: #include <paths.h>
1.129 stevesk 46: #include <signal.h>
1.47 markus 47:
48: #include <openssl/evp.h>
49: #include <openssl/md5.h>
1.1 deraadt 50:
51: #include "ssh.h"
52: #include "rsa.h"
53: #include "buffer.h"
54: #include "bufaux.h"
55: #include "xmalloc.h"
1.32 markus 56: #include "key.h"
57: #include "authfd.h"
1.37 markus 58: #include "compat.h"
1.47 markus 59: #include "log.h"
1.107 markus 60: #include "misc.h"
1.7 deraadt 61:
1.59 markus 62: #ifdef SMARTCARD
63: #include "scard.h"
1.71 jakob 64: #endif
1.59 markus 65:
1.73 stevesk 66: typedef enum {
67: AUTH_UNUSED,
68: AUTH_SOCKET,
69: AUTH_CONNECTION
70: } sock_type;
71:
1.21 markus 72: typedef struct {
73: int fd;
1.73 stevesk 74: sock_type type;
1.21 markus 75: Buffer input;
76: Buffer output;
1.87 markus 77: Buffer request;
1.1 deraadt 78: } SocketEntry;
79:
1.45 markus 80: u_int sockets_alloc = 0;
1.1 deraadt 81: SocketEntry *sockets = NULL;
82:
1.78 provos 83: typedef struct identity {
84: TAILQ_ENTRY(identity) next;
1.33 markus 85: Key *key;
1.21 markus 86: char *comment;
1.89 markus 87: u_int death;
1.107 markus 88: u_int confirm;
1.1 deraadt 89: } Identity;
90:
1.33 markus 91: typedef struct {
92: int nentries;
1.78 provos 93: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 94: } Idtab;
95:
96: /* private key table, one per protocol version */
97: Idtab idtable[3];
1.1 deraadt 98:
99: int max_fd = 0;
100:
1.11 markus 101: /* pid of shell == parent of agent */
1.29 deraadt 102: pid_t parent_pid = -1;
1.10 markus 103:
104: /* pathname and directory for AUTH_SOCKET */
1.132 djm 105: char socket_name[MAXPATHLEN];
106: char socket_dir[MAXPATHLEN];
1.10 markus 107:
1.88 markus 108: /* locking */
109: int locked = 0;
110: char *lock_passwd = NULL;
111:
1.20 markus 112: extern char *__progname;
113:
1.106 marc 114: /* Default lifetime (0 == forever) */
115: static int lifetime = 0;
116:
1.55 itojun 117: static void
1.101 stevesk 118: close_socket(SocketEntry *e)
119: {
120: close(e->fd);
121: e->fd = -1;
122: e->type = AUTH_UNUSED;
123: buffer_free(&e->input);
124: buffer_free(&e->output);
125: buffer_free(&e->request);
126: }
127:
128: static void
1.33 markus 129: idtab_init(void)
1.1 deraadt 130: {
1.33 markus 131: int i;
1.96 deraadt 132:
1.74 deraadt 133: for (i = 0; i <=2; i++) {
1.78 provos 134: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 135: idtable[i].nentries = 0;
136: }
137: }
138:
139: /* return private key table for requested protocol version */
1.55 itojun 140: static Idtab *
1.33 markus 141: idtab_lookup(int version)
142: {
143: if (version < 1 || version > 2)
144: fatal("internal error, bad protocol version %d", version);
145: return &idtable[version];
146: }
147:
1.89 markus 148: static void
149: free_identity(Identity *id)
150: {
151: key_free(id->key);
152: xfree(id->comment);
153: xfree(id);
154: }
155:
1.33 markus 156: /* return matching private key for given public key */
1.78 provos 157: static Identity *
158: lookup_identity(Key *key, int version)
1.33 markus 159: {
1.78 provos 160: Identity *id;
161:
1.33 markus 162: Idtab *tab = idtab_lookup(version);
1.78 provos 163: TAILQ_FOREACH(id, &tab->idlist, next) {
164: if (key_equal(key, id->key))
165: return (id);
1.33 markus 166: }
1.78 provos 167: return (NULL);
168: }
169:
1.107 markus 170: /* Check confirmation of keysign request */
171: static int
172: confirm_key(Identity *id)
173: {
1.122 djm 174: char *p;
1.107 markus 175: int ret = -1;
176:
177: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 178: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
179: id->comment, p))
180: ret = 0;
1.107 markus 181: xfree(p);
1.122 djm 182:
1.107 markus 183: return (ret);
184: }
185:
1.33 markus 186: /* send list of supported public keys to 'client' */
1.55 itojun 187: static void
1.33 markus 188: process_request_identities(SocketEntry *e, int version)
189: {
190: Idtab *tab = idtab_lookup(version);
1.96 deraadt 191: Identity *id;
1.21 markus 192: Buffer msg;
1.1 deraadt 193:
1.21 markus 194: buffer_init(&msg);
1.33 markus 195: buffer_put_char(&msg, (version == 1) ?
196: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
197: buffer_put_int(&msg, tab->nentries);
1.78 provos 198: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 199: if (id->key->type == KEY_RSA1) {
1.33 markus 200: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
201: buffer_put_bignum(&msg, id->key->rsa->e);
202: buffer_put_bignum(&msg, id->key->rsa->n);
203: } else {
1.45 markus 204: u_char *blob;
205: u_int blen;
1.39 markus 206: key_to_blob(id->key, &blob, &blen);
1.33 markus 207: buffer_put_string(&msg, blob, blen);
208: xfree(blob);
209: }
210: buffer_put_cstring(&msg, id->comment);
1.21 markus 211: }
212: buffer_put_int(&e->output, buffer_len(&msg));
213: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
214: buffer_free(&msg);
1.1 deraadt 215: }
216:
1.33 markus 217: /* ssh1 only */
1.55 itojun 218: static void
1.33 markus 219: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 220: {
1.96 deraadt 221: u_char buf[32], mdbuf[16], session_id[16];
222: u_int response_type;
223: BIGNUM *challenge;
1.78 provos 224: Identity *id;
1.33 markus 225: int i, len;
1.21 markus 226: Buffer msg;
227: MD5_CTX md;
1.96 deraadt 228: Key *key;
1.21 markus 229:
230: buffer_init(&msg);
1.39 markus 231: key = key_new(KEY_RSA1);
1.76 markus 232: if ((challenge = BN_new()) == NULL)
233: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 234:
1.97 markus 235: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 236: buffer_get_bignum(&e->request, key->rsa->e);
237: buffer_get_bignum(&e->request, key->rsa->n);
238: buffer_get_bignum(&e->request, challenge);
1.21 markus 239:
1.33 markus 240: /* Only protocol 1.1 is supported */
1.87 markus 241: if (buffer_len(&e->request) == 0)
1.33 markus 242: goto failure;
1.87 markus 243: buffer_get(&e->request, session_id, 16);
244: response_type = buffer_get_int(&e->request);
1.33 markus 245: if (response_type != 1)
246: goto failure;
247:
1.78 provos 248: id = lookup_identity(key, 1);
1.107 markus 249: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 250: Key *private = id->key;
1.33 markus 251: /* Decrypt the challenge using the private key. */
1.49 markus 252: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
253: goto failure;
1.33 markus 254:
255: /* The response is MD5 of decrypted challenge plus session id. */
256: len = BN_num_bytes(challenge);
257: if (len <= 0 || len > 32) {
1.109 itojun 258: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 259: goto failure;
260: }
261: memset(buf, 0, 32);
262: BN_bn2bin(challenge, buf + 32 - len);
263: MD5_Init(&md);
264: MD5_Update(&md, buf, 32);
265: MD5_Update(&md, session_id, 16);
266: MD5_Final(mdbuf, &md);
267:
268: /* Send the response. */
269: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
270: for (i = 0; i < 16; i++)
271: buffer_put_char(&msg, mdbuf[i]);
272: goto send;
273: }
1.21 markus 274:
1.33 markus 275: failure:
276: /* Unknown identity or protocol error. Send failure. */
1.21 markus 277: buffer_put_char(&msg, SSH_AGENT_FAILURE);
278: send:
279: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 280: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
281: key_free(key);
282: BN_clear_free(challenge);
283: buffer_free(&msg);
284: }
285:
286: /* ssh2 only */
1.55 itojun 287: static void
1.33 markus 288: process_sign_request2(SocketEntry *e)
289: {
1.45 markus 290: u_char *blob, *data, *signature = NULL;
291: u_int blen, dlen, slen = 0;
1.96 deraadt 292: extern int datafellows;
293: int ok = -1, flags;
1.33 markus 294: Buffer msg;
1.96 deraadt 295: Key *key;
1.33 markus 296:
297: datafellows = 0;
1.43 markus 298:
1.87 markus 299: blob = buffer_get_string(&e->request, &blen);
300: data = buffer_get_string(&e->request, &dlen);
1.37 markus 301:
1.87 markus 302: flags = buffer_get_int(&e->request);
1.37 markus 303: if (flags & SSH_AGENT_OLD_SIGNATURE)
304: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 305:
1.39 markus 306: key = key_from_blob(blob, blen);
1.33 markus 307: if (key != NULL) {
1.78 provos 308: Identity *id = lookup_identity(key, 2);
1.107 markus 309: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 310: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 311: key_free(key);
1.33 markus 312: }
313: buffer_init(&msg);
314: if (ok == 0) {
315: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
316: buffer_put_string(&msg, signature, slen);
317: } else {
318: buffer_put_char(&msg, SSH_AGENT_FAILURE);
319: }
320: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 321: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 322: buffer_len(&msg));
1.21 markus 323: buffer_free(&msg);
1.33 markus 324: xfree(data);
325: xfree(blob);
326: if (signature != NULL)
327: xfree(signature);
1.1 deraadt 328: }
329:
1.33 markus 330: /* shared */
1.55 itojun 331: static void
1.33 markus 332: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 333: {
1.96 deraadt 334: u_int blen, bits;
335: int success = 0;
1.78 provos 336: Key *key = NULL;
1.45 markus 337: u_char *blob;
1.21 markus 338:
1.74 deraadt 339: switch (version) {
1.33 markus 340: case 1:
1.39 markus 341: key = key_new(KEY_RSA1);
1.87 markus 342: bits = buffer_get_int(&e->request);
343: buffer_get_bignum(&e->request, key->rsa->e);
344: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 345:
346: if (bits != key_size(key))
1.109 itojun 347: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 348: key_size(key), bits);
1.33 markus 349: break;
350: case 2:
1.87 markus 351: blob = buffer_get_string(&e->request, &blen);
1.39 markus 352: key = key_from_blob(blob, blen);
1.33 markus 353: xfree(blob);
354: break;
355: }
356: if (key != NULL) {
1.78 provos 357: Identity *id = lookup_identity(key, version);
358: if (id != NULL) {
1.23 markus 359: /*
360: * We have this key. Free the old key. Since we
1.124 djm 361: * don't want to leave empty slots in the middle of
1.40 markus 362: * the array, we actually free the key there and move
363: * all the entries between the empty slot and the end
364: * of the array.
1.23 markus 365: */
1.33 markus 366: Idtab *tab = idtab_lookup(version);
1.38 markus 367: if (tab->nentries < 1)
368: fatal("process_remove_identity: "
369: "internal error: tab->nentries %d",
370: tab->nentries);
1.78 provos 371: TAILQ_REMOVE(&tab->idlist, id, next);
372: free_identity(id);
1.33 markus 373: tab->nentries--;
374: success = 1;
1.21 markus 375: }
1.33 markus 376: key_free(key);
377: }
1.1 deraadt 378: buffer_put_int(&e->output, 1);
1.33 markus 379: buffer_put_char(&e->output,
380: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 381: }
382:
1.55 itojun 383: static void
1.33 markus 384: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 385: {
1.33 markus 386: Idtab *tab = idtab_lookup(version);
1.78 provos 387: Identity *id;
1.21 markus 388:
389: /* Loop over all identities and clear the keys. */
1.78 provos 390: for (id = TAILQ_FIRST(&tab->idlist); id;
391: id = TAILQ_FIRST(&tab->idlist)) {
392: TAILQ_REMOVE(&tab->idlist, id, next);
393: free_identity(id);
1.21 markus 394: }
395:
396: /* Mark that there are no identities. */
1.33 markus 397: tab->nentries = 0;
1.21 markus 398:
399: /* Send success. */
400: buffer_put_int(&e->output, 1);
401: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 402: }
403:
1.55 itojun 404: static void
1.89 markus 405: reaper(void)
406: {
1.96 deraadt 407: u_int now = time(NULL);
1.89 markus 408: Identity *id, *nxt;
409: int version;
1.96 deraadt 410: Idtab *tab;
1.89 markus 411:
412: for (version = 1; version < 3; version++) {
413: tab = idtab_lookup(version);
414: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
415: nxt = TAILQ_NEXT(id, next);
416: if (id->death != 0 && now >= id->death) {
417: TAILQ_REMOVE(&tab->idlist, id, next);
418: free_identity(id);
419: tab->nentries--;
420: }
421: }
422: }
423: }
424:
425: static void
1.33 markus 426: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 427: {
1.96 deraadt 428: Idtab *tab = idtab_lookup(version);
1.107 markus 429: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 430: char *type_name, *comment;
1.33 markus 431: Key *k = NULL;
432:
433: switch (version) {
434: case 1:
1.39 markus 435: k = key_new_private(KEY_RSA1);
1.97 markus 436: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 437: buffer_get_bignum(&e->request, k->rsa->n);
438: buffer_get_bignum(&e->request, k->rsa->e);
439: buffer_get_bignum(&e->request, k->rsa->d);
440: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 441:
442: /* SSH and SSL have p and q swapped */
1.87 markus 443: buffer_get_bignum(&e->request, k->rsa->q); /* p */
444: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 445:
446: /* Generate additional parameters */
1.60 markus 447: rsa_generate_additional_parameters(k->rsa);
1.33 markus 448: break;
449: case 2:
1.87 markus 450: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 451: type = key_type_from_name(type_name);
1.39 markus 452: xfree(type_name);
1.74 deraadt 453: switch (type) {
1.39 markus 454: case KEY_DSA:
455: k = key_new_private(type);
1.87 markus 456: buffer_get_bignum2(&e->request, k->dsa->p);
457: buffer_get_bignum2(&e->request, k->dsa->q);
458: buffer_get_bignum2(&e->request, k->dsa->g);
459: buffer_get_bignum2(&e->request, k->dsa->pub_key);
460: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 461: break;
462: case KEY_RSA:
463: k = key_new_private(type);
1.87 markus 464: buffer_get_bignum2(&e->request, k->rsa->n);
465: buffer_get_bignum2(&e->request, k->rsa->e);
466: buffer_get_bignum2(&e->request, k->rsa->d);
467: buffer_get_bignum2(&e->request, k->rsa->iqmp);
468: buffer_get_bignum2(&e->request, k->rsa->p);
469: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 470:
471: /* Generate additional parameters */
1.60 markus 472: rsa_generate_additional_parameters(k->rsa);
1.39 markus 473: break;
474: default:
1.87 markus 475: buffer_clear(&e->request);
1.108 markus 476: goto send;
477: }
478: break;
479: }
480: /* enable blinding */
481: switch (k->type) {
482: case KEY_RSA:
483: case KEY_RSA1:
484: if (RSA_blinding_on(k->rsa, NULL) != 1) {
485: error("process_add_identity: RSA_blinding_on failed");
486: key_free(k);
1.33 markus 487: goto send;
1.21 markus 488: }
1.33 markus 489: break;
490: }
1.87 markus 491: comment = buffer_get_string(&e->request, NULL);
1.33 markus 492: if (k == NULL) {
493: xfree(comment);
494: goto send;
495: }
496: success = 1;
1.94 markus 497: while (buffer_len(&e->request)) {
498: switch (buffer_get_char(&e->request)) {
499: case SSH_AGENT_CONSTRAIN_LIFETIME:
500: death = time(NULL) + buffer_get_int(&e->request);
501: break;
1.107 markus 502: case SSH_AGENT_CONSTRAIN_CONFIRM:
503: confirm = 1;
504: break;
1.94 markus 505: default:
506: break;
507: }
508: }
1.106 marc 509: if (lifetime && !death)
510: death = time(NULL) + lifetime;
1.78 provos 511: if (lookup_identity(k, version) == NULL) {
512: Identity *id = xmalloc(sizeof(Identity));
513: id->key = k;
514: id->comment = comment;
1.94 markus 515: id->death = death;
1.107 markus 516: id->confirm = confirm;
1.78 provos 517: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 518: /* Increment the number of identities. */
519: tab->nentries++;
520: } else {
521: key_free(k);
522: xfree(comment);
523: }
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));
541: xfree(lock_passwd);
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));
550: xfree(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:
572: #ifdef SMARTCARD
573: static void
574: process_add_smartcard_key (SocketEntry *e)
575: {
1.96 deraadt 576: char *sc_reader_id = NULL, *pin;
1.110 djm 577: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 578: Key **keys, *k;
1.84 markus 579: Identity *id;
1.59 markus 580: Idtab *tab;
1.75 deraadt 581:
1.87 markus 582: sc_reader_id = buffer_get_string(&e->request, NULL);
583: pin = buffer_get_string(&e->request, NULL);
1.110 djm 584:
585: while (buffer_len(&e->request)) {
586: switch (buffer_get_char(&e->request)) {
587: case SSH_AGENT_CONSTRAIN_LIFETIME:
588: death = time(NULL) + buffer_get_int(&e->request);
589: break;
590: case SSH_AGENT_CONSTRAIN_CONFIRM:
591: confirm = 1;
592: break;
593: default:
594: break;
595: }
596: }
597: if (lifetime && !death)
598: death = time(NULL) + lifetime;
599:
1.84 markus 600: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 601: xfree(sc_reader_id);
1.83 rees 602: xfree(pin);
1.59 markus 603:
1.84 markus 604: if (keys == NULL || keys[0] == NULL) {
605: error("sc_get_keys failed");
1.59 markus 606: goto send;
607: }
1.84 markus 608: for (i = 0; keys[i] != NULL; i++) {
609: k = keys[i];
610: version = k->type == KEY_RSA1 ? 1 : 2;
611: tab = idtab_lookup(version);
612: if (lookup_identity(k, version) == NULL) {
613: id = xmalloc(sizeof(Identity));
614: id->key = k;
1.111 markus 615: id->comment = sc_get_key_label(k);
1.110 djm 616: id->death = death;
617: id->confirm = confirm;
1.84 markus 618: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
619: tab->nentries++;
620: success = 1;
621: } else {
622: key_free(k);
623: }
624: keys[i] = NULL;
1.59 markus 625: }
1.84 markus 626: xfree(keys);
1.59 markus 627: send:
628: buffer_put_int(&e->output, 1);
629: buffer_put_char(&e->output,
630: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
631: }
632:
633: static void
634: process_remove_smartcard_key(SocketEntry *e)
635: {
1.96 deraadt 636: char *sc_reader_id = NULL, *pin;
637: int i, version, success = 0;
638: Key **keys, *k = NULL;
1.84 markus 639: Identity *id;
640: Idtab *tab;
1.59 markus 641:
1.87 markus 642: sc_reader_id = buffer_get_string(&e->request, NULL);
643: pin = buffer_get_string(&e->request, NULL);
1.84 markus 644: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 645: xfree(sc_reader_id);
1.83 rees 646: xfree(pin);
1.59 markus 647:
1.84 markus 648: if (keys == NULL || keys[0] == NULL) {
649: error("sc_get_keys failed");
650: goto send;
651: }
652: for (i = 0; keys[i] != NULL; i++) {
653: k = keys[i];
654: version = k->type == KEY_RSA1 ? 1 : 2;
655: if ((id = lookup_identity(k, version)) != NULL) {
656: tab = idtab_lookup(version);
1.90 markus 657: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 658: tab->nentries--;
1.78 provos 659: free_identity(id);
1.59 markus 660: success = 1;
661: }
662: key_free(k);
1.84 markus 663: keys[i] = NULL;
1.59 markus 664: }
1.84 markus 665: xfree(keys);
666: send:
1.59 markus 667: buffer_put_int(&e->output, 1);
668: buffer_put_char(&e->output,
669: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
670: }
1.70 jakob 671: #endif /* SMARTCARD */
1.59 markus 672:
1.33 markus 673: /* dispatch incoming messages */
674:
1.55 itojun 675: static void
1.2 provos 676: process_message(SocketEntry *e)
1.1 deraadt 677: {
1.96 deraadt 678: u_int msg_len, type;
1.45 markus 679: u_char *cp;
1.89 markus 680:
681: /* kill dead keys */
682: reaper();
683:
1.21 markus 684: if (buffer_len(&e->input) < 5)
685: return; /* Incomplete message. */
1.77 stevesk 686: cp = buffer_ptr(&e->input);
1.137 djm 687: msg_len = get_u32(cp);
1.21 markus 688: if (msg_len > 256 * 1024) {
1.101 stevesk 689: close_socket(e);
1.21 markus 690: return;
691: }
692: if (buffer_len(&e->input) < msg_len + 4)
693: return;
1.87 markus 694:
695: /* move the current input to e->request */
1.21 markus 696: buffer_consume(&e->input, 4);
1.87 markus 697: buffer_clear(&e->request);
698: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
699: buffer_consume(&e->input, msg_len);
700: type = buffer_get_char(&e->request);
1.21 markus 701:
1.88 markus 702: /* check wheter agent is locked */
703: if (locked && type != SSH_AGENTC_UNLOCK) {
704: buffer_clear(&e->request);
705: switch (type) {
706: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
707: case SSH2_AGENTC_REQUEST_IDENTITIES:
708: /* send empty lists */
709: no_identities(e, type);
710: break;
711: default:
712: /* send a fail message for all other request types */
713: buffer_put_int(&e->output, 1);
714: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
715: }
716: return;
717: }
718:
1.59 markus 719: debug("type %d", type);
1.21 markus 720: switch (type) {
1.88 markus 721: case SSH_AGENTC_LOCK:
722: case SSH_AGENTC_UNLOCK:
723: process_lock_agent(e, type == SSH_AGENTC_LOCK);
724: break;
1.33 markus 725: /* ssh1 */
726: case SSH_AGENTC_RSA_CHALLENGE:
727: process_authentication_challenge1(e);
728: break;
1.21 markus 729: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 730: process_request_identities(e, 1);
1.21 markus 731: break;
732: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 733: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 734: process_add_identity(e, 1);
1.21 markus 735: break;
736: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 737: process_remove_identity(e, 1);
1.21 markus 738: break;
739: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 740: process_remove_all_identities(e, 1);
741: break;
742: /* ssh2 */
743: case SSH2_AGENTC_SIGN_REQUEST:
744: process_sign_request2(e);
745: break;
746: case SSH2_AGENTC_REQUEST_IDENTITIES:
747: process_request_identities(e, 2);
748: break;
749: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 750: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 751: process_add_identity(e, 2);
752: break;
753: case SSH2_AGENTC_REMOVE_IDENTITY:
754: process_remove_identity(e, 2);
755: break;
756: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
757: process_remove_all_identities(e, 2);
1.21 markus 758: break;
1.59 markus 759: #ifdef SMARTCARD
760: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 761: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 762: process_add_smartcard_key(e);
1.75 deraadt 763: break;
1.59 markus 764: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
765: process_remove_smartcard_key(e);
1.75 deraadt 766: break;
1.70 jakob 767: #endif /* SMARTCARD */
1.21 markus 768: default:
769: /* Unknown message. Respond with failure. */
770: error("Unknown message %d", type);
1.87 markus 771: buffer_clear(&e->request);
1.21 markus 772: buffer_put_int(&e->output, 1);
773: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
774: break;
775: }
1.1 deraadt 776: }
777:
1.55 itojun 778: static void
1.73 stevesk 779: new_socket(sock_type type, int fd)
1.1 deraadt 780: {
1.112 markus 781: u_int i, old_alloc, new_alloc;
1.96 deraadt 782:
1.119 djm 783: set_nonblock(fd);
1.21 markus 784:
785: if (fd > max_fd)
786: max_fd = fd;
787:
788: for (i = 0; i < sockets_alloc; i++)
789: if (sockets[i].type == AUTH_UNUSED) {
790: sockets[i].fd = fd;
791: buffer_init(&sockets[i].input);
792: buffer_init(&sockets[i].output);
1.87 markus 793: buffer_init(&sockets[i].request);
1.112 markus 794: sockets[i].type = type;
1.21 markus 795: return;
796: }
797: old_alloc = sockets_alloc;
1.112 markus 798: new_alloc = sockets_alloc + 10;
1.133 djm 799: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 800: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 801: sockets[i].type = AUTH_UNUSED;
1.112 markus 802: sockets_alloc = new_alloc;
1.21 markus 803: sockets[old_alloc].fd = fd;
804: buffer_init(&sockets[old_alloc].input);
805: buffer_init(&sockets[old_alloc].output);
1.87 markus 806: buffer_init(&sockets[old_alloc].request);
1.112 markus 807: sockets[old_alloc].type = type;
1.1 deraadt 808: }
809:
1.55 itojun 810: static int
1.120 avsm 811: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 812: {
1.46 markus 813: u_int i, sz;
814: int n = 0;
815:
816: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 817: switch (sockets[i].type) {
818: case AUTH_SOCKET:
819: case AUTH_CONNECTION:
1.46 markus 820: n = MAX(n, sockets[i].fd);
1.21 markus 821: break;
822: case AUTH_UNUSED:
823: break;
824: default:
825: fatal("Unknown socket type %d", sockets[i].type);
826: break;
827: }
1.46 markus 828: }
829:
830: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 831: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 832: if (*fdrp)
1.54 stevesk 833: xfree(*fdrp);
1.46 markus 834: if (*fdwp)
1.54 stevesk 835: xfree(*fdwp);
1.46 markus 836: *fdrp = xmalloc(sz);
837: *fdwp = xmalloc(sz);
1.66 markus 838: *nallocp = sz;
1.46 markus 839: }
1.66 markus 840: if (n < *fdl)
841: debug("XXX shrink: %d < %d", n, *fdl);
842: *fdl = n;
1.46 markus 843: memset(*fdrp, 0, sz);
844: memset(*fdwp, 0, sz);
845:
846: for (i = 0; i < sockets_alloc; i++) {
847: switch (sockets[i].type) {
848: case AUTH_SOCKET:
849: case AUTH_CONNECTION:
850: FD_SET(sockets[i].fd, *fdrp);
851: if (buffer_len(&sockets[i].output) > 0)
852: FD_SET(sockets[i].fd, *fdwp);
853: break;
854: default:
855: break;
856: }
857: }
858: return (1);
1.21 markus 859: }
860:
1.55 itojun 861: static void
1.21 markus 862: after_select(fd_set *readset, fd_set *writeset)
863: {
1.96 deraadt 864: struct sockaddr_un sunaddr;
1.26 markus 865: socklen_t slen;
1.21 markus 866: char buf[1024];
1.96 deraadt 867: int len, sock;
868: u_int i;
1.103 markus 869: uid_t euid;
870: gid_t egid;
1.21 markus 871:
872: for (i = 0; i < sockets_alloc; i++)
873: switch (sockets[i].type) {
874: case AUTH_UNUSED:
875: break;
876: case AUTH_SOCKET:
877: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 878: slen = sizeof(sunaddr);
1.46 markus 879: sock = accept(sockets[i].fd,
1.131 deraadt 880: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 881: if (sock < 0) {
1.81 stevesk 882: error("accept from AUTH_SOCKET: %s",
883: strerror(errno));
1.103 markus 884: break;
885: }
886: if (getpeereid(sock, &euid, &egid) < 0) {
887: error("getpeereid %d failed: %s",
888: sock, strerror(errno));
889: close(sock);
890: break;
891: }
1.105 markus 892: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 893: error("uid mismatch: "
1.104 stevesk 894: "peer euid %u != uid %u",
895: (u_int) euid, (u_int) getuid());
1.103 markus 896: close(sock);
1.21 markus 897: break;
898: }
899: new_socket(AUTH_CONNECTION, sock);
900: }
901: break;
902: case AUTH_CONNECTION:
903: if (buffer_len(&sockets[i].output) > 0 &&
904: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 905: do {
906: len = write(sockets[i].fd,
907: buffer_ptr(&sockets[i].output),
908: buffer_len(&sockets[i].output));
909: if (len == -1 && (errno == EAGAIN ||
910: errno == EINTR))
911: continue;
912: break;
913: } while (1);
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)) {
1.52 deraadt 921: do {
922: len = read(sockets[i].fd, buf, sizeof(buf));
923: if (len == -1 && (errno == EAGAIN ||
924: errno == EINTR))
925: continue;
926: break;
927: } while (1);
1.21 markus 928: if (len <= 0) {
1.101 stevesk 929: close_socket(&sockets[i]);
1.21 markus 930: break;
931: }
932: buffer_append(&sockets[i].input, buf, len);
933: process_message(&sockets[i]);
934: }
935: break;
936: default:
937: fatal("Unknown type %d", sockets[i].type);
938: }
1.1 deraadt 939: }
940:
1.55 itojun 941: static void
1.113 markus 942: cleanup_socket(void)
1.15 markus 943: {
1.48 deraadt 944: if (socket_name[0])
945: unlink(socket_name);
946: if (socket_dir[0])
947: rmdir(socket_dir);
1.10 markus 948: }
949:
1.114 markus 950: void
1.15 markus 951: cleanup_exit(int i)
952: {
1.113 markus 953: cleanup_socket();
954: _exit(i);
1.15 markus 955: }
956:
1.135 deraadt 957: /*ARGSUSED*/
1.55 itojun 958: static void
1.48 deraadt 959: cleanup_handler(int sig)
960: {
1.113 markus 961: cleanup_socket();
1.48 deraadt 962: _exit(2);
1.113 markus 963: }
964:
1.135 deraadt 965: /*ARGSUSED*/
1.68 markus 966: static void
967: check_parent_exists(int sig)
968: {
969: int save_errno = errno;
970:
971: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
972: /* printf("Parent has died - Authentication agent exiting.\n"); */
973: cleanup_handler(sig); /* safe */
974: }
975: signal(SIGALRM, check_parent_exists);
976: alarm(10);
977: errno = save_errno;
1.48 deraadt 978: }
979:
1.55 itojun 980: static void
1.50 itojun 981: usage(void)
1.15 markus 982: {
1.72 jakob 983: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 984: __progname);
1.72 jakob 985: fprintf(stderr, "Options:\n");
986: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
987: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
988: fprintf(stderr, " -k Kill the current agent.\n");
989: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 990: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 991: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 992: exit(1);
1.15 markus 993: }
994:
1.2 provos 995: int
996: main(int ac, char **av)
1.1 deraadt 997: {
1.107 markus 998: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.120 avsm 999: int sock, fd, ch;
1000: u_int nalloc;
1.96 deraadt 1001: char *shell, *format, *pidstr, *agentsocket = NULL;
1002: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1003: struct sockaddr_un sunaddr;
1.41 markus 1004: struct rlimit rlim;
1.96 deraadt 1005: extern int optind;
1.98 stevesk 1006: extern char *optarg;
1.21 markus 1007: pid_t pid;
1.96 deraadt 1008: char pidstrbuf[1 + 3 * sizeof pid];
1.123 djm 1009:
1010: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1011: sanitise_stdfd();
1.99 markus 1012:
1013: /* drop */
1014: setegid(getgid());
1015: setgid(getgid());
1.53 markus 1016:
1017: SSLeay_add_all_algorithms();
1.21 markus 1018:
1.106 marc 1019: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1020: switch (ch) {
1021: case 'c':
1022: if (s_flag)
1023: usage();
1024: c_flag++;
1025: break;
1026: case 'k':
1027: k_flag++;
1028: break;
1029: case 's':
1030: if (c_flag)
1031: usage();
1032: s_flag++;
1033: break;
1.57 markus 1034: case 'd':
1035: if (d_flag)
1036: usage();
1037: d_flag++;
1038: break;
1.86 markus 1039: case 'a':
1040: agentsocket = optarg;
1.106 marc 1041: break;
1042: case 't':
1043: if ((lifetime = convtime(optarg)) == -1) {
1044: fprintf(stderr, "Invalid lifetime\n");
1045: usage();
1046: }
1.86 markus 1047: break;
1.21 markus 1048: default:
1049: usage();
1050: }
1051: }
1052: ac -= optind;
1053: av += optind;
1054:
1.57 markus 1055: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1056: usage();
1057:
1.85 markus 1058: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1059: shell = getenv("SHELL");
1.136 deraadt 1060: if (shell != NULL &&
1061: strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1.21 markus 1062: c_flag = 1;
1063: }
1064: if (k_flag) {
1.136 deraadt 1065: const char *errstr = NULL;
1066:
1.21 markus 1067: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1068: if (pidstr == NULL) {
1069: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1070: SSH_AGENTPID_ENV_NAME);
1.21 markus 1071: exit(1);
1072: }
1.136 deraadt 1073: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1074: if (errstr) {
1075: fprintf(stderr,
1076: "%s=\"%s\", which is not a good PID: %s\n",
1077: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1078: exit(1);
1079: }
1080: if (kill(pid, SIGTERM) == -1) {
1081: perror("kill");
1082: exit(1);
1083: }
1084: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1085: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1086: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1087: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1088: exit(0);
1089: }
1090: parent_pid = getpid();
1091:
1.86 markus 1092: if (agentsocket == NULL) {
1093: /* Create private directory for agent socket */
1.115 markus 1094: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1095: if (mkdtemp(socket_dir) == NULL) {
1096: perror("mkdtemp: private socket dir");
1097: exit(1);
1098: }
1.91 mpech 1099: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1100: (long)parent_pid);
1.86 markus 1101: } else {
1102: /* Try to use specified agent socket */
1103: socket_dir[0] = '\0';
1104: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1105: }
1106:
1.23 markus 1107: /*
1108: * Create socket early so it will exist before command gets run from
1109: * the parent.
1110: */
1.21 markus 1111: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1112: if (sock < 0) {
1113: perror("socket");
1.121 djm 1114: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1115: cleanup_exit(1);
1116: }
1117: memset(&sunaddr, 0, sizeof(sunaddr));
1118: sunaddr.sun_family = AF_UNIX;
1119: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1120: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1121: perror("bind");
1.121 djm 1122: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1123: cleanup_exit(1);
1124: }
1.117 markus 1125: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1126: perror("listen");
1127: cleanup_exit(1);
1128: }
1.46 markus 1129:
1.23 markus 1130: /*
1131: * Fork, and have the parent execute the command, if any, or present
1132: * the socket data. The child continues as the authentication agent.
1133: */
1.57 markus 1134: if (d_flag) {
1135: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1136: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1137: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1138: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1139: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1140: goto skip;
1141: }
1.21 markus 1142: pid = fork();
1143: if (pid == -1) {
1144: perror("fork");
1.81 stevesk 1145: cleanup_exit(1);
1.21 markus 1146: }
1147: if (pid != 0) { /* Parent - execute the given command. */
1148: close(sock);
1.91 mpech 1149: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1150: if (ac == 0) {
1151: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1152: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1153: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1154: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1155: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1156: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1157: exit(0);
1158: }
1.36 deraadt 1159: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1160: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1161: perror("setenv");
1162: exit(1);
1163: }
1.21 markus 1164: execvp(av[0], av);
1165: perror(av[0]);
1166: exit(1);
1167: }
1.81 stevesk 1168: /* child */
1169: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1170:
1171: if (setsid() == -1) {
1.81 stevesk 1172: error("setsid: %s", strerror(errno));
1.67 stevesk 1173: cleanup_exit(1);
1174: }
1175:
1176: (void)chdir("/");
1.107 markus 1177: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1178: /* XXX might close listen socket */
1179: (void)dup2(fd, STDIN_FILENO);
1180: (void)dup2(fd, STDOUT_FILENO);
1181: (void)dup2(fd, STDERR_FILENO);
1182: if (fd > 2)
1183: close(fd);
1184: }
1.21 markus 1185:
1.41 markus 1186: /* deny core dumps, since memory contains unencrypted private keys */
1187: rlim.rlim_cur = rlim.rlim_max = 0;
1188: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1189: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1190: cleanup_exit(1);
1191: }
1.57 markus 1192:
1193: skip:
1.21 markus 1194: new_socket(AUTH_SOCKET, sock);
1195: if (ac > 0) {
1196: signal(SIGALRM, check_parent_exists);
1197: alarm(10);
1198: }
1.33 markus 1199: idtab_init();
1.61 markus 1200: if (!d_flag)
1.57 markus 1201: signal(SIGINT, SIG_IGN);
1.61 markus 1202: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1203: signal(SIGHUP, cleanup_handler);
1204: signal(SIGTERM, cleanup_handler);
1.66 markus 1205: nalloc = 0;
1206:
1.21 markus 1207: while (1) {
1.66 markus 1208: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1209: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1210: if (errno == EINTR)
1211: continue;
1.81 stevesk 1212: fatal("select: %s", strerror(errno));
1.21 markus 1213: }
1.46 markus 1214: after_select(readsetp, writesetp);
1.15 markus 1215: }
1.21 markus 1216: /* NOTREACHED */
1.1 deraadt 1217: }
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