Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.165
1.165 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.164 2010/02/09 00:50:36 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:
1.163 markus 69: #ifdef ENABLE_PKCS11
70: #include "ssh-pkcs11.h"
1.71 jakob 71: #endif
1.59 markus 72:
1.73 stevesk 73: typedef enum {
74: AUTH_UNUSED,
75: AUTH_SOCKET,
76: AUTH_CONNECTION
77: } sock_type;
78:
1.21 markus 79: typedef struct {
80: int fd;
1.73 stevesk 81: sock_type type;
1.21 markus 82: Buffer input;
83: Buffer output;
1.87 markus 84: Buffer request;
1.1 deraadt 85: } SocketEntry;
86:
1.45 markus 87: u_int sockets_alloc = 0;
1.1 deraadt 88: SocketEntry *sockets = NULL;
89:
1.78 provos 90: typedef struct identity {
91: TAILQ_ENTRY(identity) next;
1.33 markus 92: Key *key;
1.21 markus 93: char *comment;
1.163 markus 94: char *provider;
1.89 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;
1.155 dtucker 111: u_int parent_alive_interval = 0;
1.10 markus 112:
113: /* pathname and directory for AUTH_SOCKET */
1.132 djm 114: char socket_name[MAXPATHLEN];
115: char socket_dir[MAXPATHLEN];
1.10 markus 116:
1.88 markus 117: /* locking */
118: int locked = 0;
119: char *lock_passwd = NULL;
120:
1.20 markus 121: extern char *__progname;
122:
1.106 marc 123: /* Default lifetime (0 == forever) */
124: static int lifetime = 0;
125:
1.55 itojun 126: static void
1.101 stevesk 127: close_socket(SocketEntry *e)
128: {
129: close(e->fd);
130: e->fd = -1;
131: e->type = AUTH_UNUSED;
132: buffer_free(&e->input);
133: buffer_free(&e->output);
134: buffer_free(&e->request);
135: }
136:
137: static void
1.33 markus 138: idtab_init(void)
1.1 deraadt 139: {
1.33 markus 140: int i;
1.96 deraadt 141:
1.74 deraadt 142: for (i = 0; i <=2; i++) {
1.78 provos 143: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 144: idtable[i].nentries = 0;
145: }
146: }
147:
148: /* return private key table for requested protocol version */
1.55 itojun 149: static Idtab *
1.33 markus 150: idtab_lookup(int version)
151: {
152: if (version < 1 || version > 2)
153: fatal("internal error, bad protocol version %d", version);
154: return &idtable[version];
155: }
156:
1.89 markus 157: static void
158: free_identity(Identity *id)
159: {
160: key_free(id->key);
1.164 djm 161: if (id->provider != NULL)
162: xfree(id->provider);
1.89 markus 163: xfree(id->comment);
164: xfree(id);
165: }
166:
1.33 markus 167: /* return matching private key for given public key */
1.78 provos 168: static Identity *
169: lookup_identity(Key *key, int version)
1.33 markus 170: {
1.78 provos 171: Identity *id;
172:
1.33 markus 173: Idtab *tab = idtab_lookup(version);
1.78 provos 174: TAILQ_FOREACH(id, &tab->idlist, next) {
175: if (key_equal(key, id->key))
176: return (id);
1.33 markus 177: }
1.78 provos 178: return (NULL);
179: }
180:
1.107 markus 181: /* Check confirmation of keysign request */
182: static int
183: confirm_key(Identity *id)
184: {
1.122 djm 185: char *p;
1.107 markus 186: int ret = -1;
187:
188: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 189: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
190: id->comment, p))
191: ret = 0;
1.107 markus 192: xfree(p);
1.122 djm 193:
1.107 markus 194: return (ret);
195: }
196:
1.33 markus 197: /* send list of supported public keys to 'client' */
1.55 itojun 198: static void
1.33 markus 199: process_request_identities(SocketEntry *e, int version)
200: {
201: Idtab *tab = idtab_lookup(version);
1.96 deraadt 202: Identity *id;
1.21 markus 203: Buffer msg;
1.1 deraadt 204:
1.21 markus 205: buffer_init(&msg);
1.33 markus 206: buffer_put_char(&msg, (version == 1) ?
207: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
208: buffer_put_int(&msg, tab->nentries);
1.78 provos 209: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 210: if (id->key->type == KEY_RSA1) {
1.33 markus 211: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
212: buffer_put_bignum(&msg, id->key->rsa->e);
213: buffer_put_bignum(&msg, id->key->rsa->n);
214: } else {
1.45 markus 215: u_char *blob;
216: u_int blen;
1.39 markus 217: key_to_blob(id->key, &blob, &blen);
1.33 markus 218: buffer_put_string(&msg, blob, blen);
219: xfree(blob);
220: }
221: buffer_put_cstring(&msg, id->comment);
1.21 markus 222: }
223: buffer_put_int(&e->output, buffer_len(&msg));
224: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
225: buffer_free(&msg);
1.1 deraadt 226: }
227:
1.33 markus 228: /* ssh1 only */
1.55 itojun 229: static void
1.33 markus 230: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 231: {
1.96 deraadt 232: u_char buf[32], mdbuf[16], session_id[16];
233: u_int response_type;
234: BIGNUM *challenge;
1.78 provos 235: Identity *id;
1.33 markus 236: int i, len;
1.21 markus 237: Buffer msg;
238: MD5_CTX md;
1.96 deraadt 239: Key *key;
1.21 markus 240:
241: buffer_init(&msg);
1.39 markus 242: key = key_new(KEY_RSA1);
1.76 markus 243: if ((challenge = BN_new()) == NULL)
244: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 245:
1.97 markus 246: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 247: buffer_get_bignum(&e->request, key->rsa->e);
248: buffer_get_bignum(&e->request, key->rsa->n);
249: buffer_get_bignum(&e->request, challenge);
1.21 markus 250:
1.33 markus 251: /* Only protocol 1.1 is supported */
1.87 markus 252: if (buffer_len(&e->request) == 0)
1.33 markus 253: goto failure;
1.87 markus 254: buffer_get(&e->request, session_id, 16);
255: response_type = buffer_get_int(&e->request);
1.33 markus 256: if (response_type != 1)
257: goto failure;
258:
1.78 provos 259: id = lookup_identity(key, 1);
1.107 markus 260: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 261: Key *private = id->key;
1.33 markus 262: /* Decrypt the challenge using the private key. */
1.49 markus 263: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
264: goto failure;
1.33 markus 265:
266: /* The response is MD5 of decrypted challenge plus session id. */
267: len = BN_num_bytes(challenge);
268: if (len <= 0 || len > 32) {
1.109 itojun 269: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 270: goto failure;
271: }
272: memset(buf, 0, 32);
273: BN_bn2bin(challenge, buf + 32 - len);
274: MD5_Init(&md);
275: MD5_Update(&md, buf, 32);
276: MD5_Update(&md, session_id, 16);
277: MD5_Final(mdbuf, &md);
278:
279: /* Send the response. */
280: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
281: for (i = 0; i < 16; i++)
282: buffer_put_char(&msg, mdbuf[i]);
283: goto send;
284: }
1.21 markus 285:
1.33 markus 286: failure:
287: /* Unknown identity or protocol error. Send failure. */
1.21 markus 288: buffer_put_char(&msg, SSH_AGENT_FAILURE);
289: send:
290: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 291: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
292: key_free(key);
293: BN_clear_free(challenge);
294: buffer_free(&msg);
295: }
296:
297: /* ssh2 only */
1.55 itojun 298: static void
1.33 markus 299: process_sign_request2(SocketEntry *e)
300: {
1.45 markus 301: u_char *blob, *data, *signature = NULL;
302: u_int blen, dlen, slen = 0;
1.96 deraadt 303: extern int datafellows;
1.159 djm 304: int odatafellows;
1.96 deraadt 305: int ok = -1, flags;
1.33 markus 306: Buffer msg;
1.96 deraadt 307: Key *key;
1.33 markus 308:
309: datafellows = 0;
1.43 markus 310:
1.87 markus 311: blob = buffer_get_string(&e->request, &blen);
312: data = buffer_get_string(&e->request, &dlen);
1.37 markus 313:
1.87 markus 314: flags = buffer_get_int(&e->request);
1.159 djm 315: odatafellows = datafellows;
1.37 markus 316: if (flags & SSH_AGENT_OLD_SIGNATURE)
317: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 318:
1.39 markus 319: key = key_from_blob(blob, blen);
1.33 markus 320: if (key != NULL) {
1.78 provos 321: Identity *id = lookup_identity(key, 2);
1.107 markus 322: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 323: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 324: key_free(key);
1.33 markus 325: }
326: buffer_init(&msg);
327: if (ok == 0) {
328: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
329: buffer_put_string(&msg, signature, slen);
330: } else {
331: buffer_put_char(&msg, SSH_AGENT_FAILURE);
332: }
333: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 334: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 335: buffer_len(&msg));
1.21 markus 336: buffer_free(&msg);
1.33 markus 337: xfree(data);
338: xfree(blob);
339: if (signature != NULL)
340: xfree(signature);
1.159 djm 341: datafellows = odatafellows;
1.1 deraadt 342: }
343:
1.33 markus 344: /* shared */
1.55 itojun 345: static void
1.33 markus 346: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 347: {
1.96 deraadt 348: u_int blen, bits;
349: int success = 0;
1.78 provos 350: Key *key = NULL;
1.45 markus 351: u_char *blob;
1.21 markus 352:
1.74 deraadt 353: switch (version) {
1.33 markus 354: case 1:
1.39 markus 355: key = key_new(KEY_RSA1);
1.87 markus 356: bits = buffer_get_int(&e->request);
357: buffer_get_bignum(&e->request, key->rsa->e);
358: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 359:
360: if (bits != key_size(key))
1.109 itojun 361: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 362: key_size(key), bits);
1.33 markus 363: break;
364: case 2:
1.87 markus 365: blob = buffer_get_string(&e->request, &blen);
1.39 markus 366: key = key_from_blob(blob, blen);
1.33 markus 367: xfree(blob);
368: break;
369: }
370: if (key != NULL) {
1.78 provos 371: Identity *id = lookup_identity(key, version);
372: if (id != NULL) {
1.23 markus 373: /*
374: * We have this key. Free the old key. Since we
1.124 djm 375: * don't want to leave empty slots in the middle of
1.40 markus 376: * the array, we actually free the key there and move
377: * all the entries between the empty slot and the end
378: * of the array.
1.23 markus 379: */
1.33 markus 380: Idtab *tab = idtab_lookup(version);
1.38 markus 381: if (tab->nentries < 1)
382: fatal("process_remove_identity: "
383: "internal error: tab->nentries %d",
384: tab->nentries);
1.78 provos 385: TAILQ_REMOVE(&tab->idlist, id, next);
386: free_identity(id);
1.33 markus 387: tab->nentries--;
388: success = 1;
1.21 markus 389: }
1.33 markus 390: key_free(key);
391: }
1.1 deraadt 392: buffer_put_int(&e->output, 1);
1.33 markus 393: buffer_put_char(&e->output,
394: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 395: }
396:
1.55 itojun 397: static void
1.33 markus 398: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 399: {
1.33 markus 400: Idtab *tab = idtab_lookup(version);
1.78 provos 401: Identity *id;
1.21 markus 402:
403: /* Loop over all identities and clear the keys. */
1.78 provos 404: for (id = TAILQ_FIRST(&tab->idlist); id;
405: id = TAILQ_FIRST(&tab->idlist)) {
406: TAILQ_REMOVE(&tab->idlist, id, next);
407: free_identity(id);
1.21 markus 408: }
409:
410: /* Mark that there are no identities. */
1.33 markus 411: tab->nentries = 0;
1.21 markus 412:
413: /* Send success. */
414: buffer_put_int(&e->output, 1);
415: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 416: }
417:
1.155 dtucker 418: /* removes expired keys and returns number of seconds until the next expiry */
419: static u_int
1.89 markus 420: reaper(void)
421: {
1.155 dtucker 422: u_int deadline = 0, now = time(NULL);
1.89 markus 423: Identity *id, *nxt;
424: int version;
1.96 deraadt 425: Idtab *tab;
1.89 markus 426:
427: for (version = 1; version < 3; version++) {
428: tab = idtab_lookup(version);
429: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
430: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 431: if (id->death == 0)
432: continue;
433: if (now >= id->death) {
1.154 dtucker 434: debug("expiring key '%s'", id->comment);
1.89 markus 435: TAILQ_REMOVE(&tab->idlist, id, next);
436: free_identity(id);
437: tab->nentries--;
1.155 dtucker 438: } else
439: deadline = (deadline == 0) ? id->death :
440: MIN(deadline, id->death);
1.89 markus 441: }
442: }
1.155 dtucker 443: if (deadline == 0 || deadline <= now)
444: return 0;
445: else
446: return (deadline - now);
1.89 markus 447: }
448:
449: static void
1.33 markus 450: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 451: {
1.96 deraadt 452: Idtab *tab = idtab_lookup(version);
1.157 canacar 453: Identity *id;
1.107 markus 454: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 455: char *type_name, *comment;
1.33 markus 456: Key *k = NULL;
1.165 ! djm 457: u_char *cert;
! 458: u_int len;
1.33 markus 459:
460: switch (version) {
461: case 1:
1.39 markus 462: k = key_new_private(KEY_RSA1);
1.97 markus 463: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 464: buffer_get_bignum(&e->request, k->rsa->n);
465: buffer_get_bignum(&e->request, k->rsa->e);
466: buffer_get_bignum(&e->request, k->rsa->d);
467: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 468:
469: /* SSH and SSL have p and q swapped */
1.87 markus 470: buffer_get_bignum(&e->request, k->rsa->q); /* p */
471: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 472:
473: /* Generate additional parameters */
1.60 markus 474: rsa_generate_additional_parameters(k->rsa);
1.33 markus 475: break;
476: case 2:
1.87 markus 477: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 478: type = key_type_from_name(type_name);
1.39 markus 479: xfree(type_name);
1.74 deraadt 480: switch (type) {
1.39 markus 481: case KEY_DSA:
482: k = key_new_private(type);
1.87 markus 483: buffer_get_bignum2(&e->request, k->dsa->p);
484: buffer_get_bignum2(&e->request, k->dsa->q);
485: buffer_get_bignum2(&e->request, k->dsa->g);
486: buffer_get_bignum2(&e->request, k->dsa->pub_key);
487: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 488: break;
1.165 ! djm 489: case KEY_DSA_CERT:
! 490: cert = buffer_get_string(&e->request, &len);
! 491: if ((k = key_from_blob(cert, len)) == NULL)
! 492: fatal("Certificate parse failed");
! 493: xfree(cert);
! 494: key_add_private(k);
! 495: buffer_get_bignum2(&e->request, k->dsa->priv_key);
! 496: break;
1.39 markus 497: case KEY_RSA:
498: k = key_new_private(type);
1.87 markus 499: buffer_get_bignum2(&e->request, k->rsa->n);
500: buffer_get_bignum2(&e->request, k->rsa->e);
501: buffer_get_bignum2(&e->request, k->rsa->d);
502: buffer_get_bignum2(&e->request, k->rsa->iqmp);
503: buffer_get_bignum2(&e->request, k->rsa->p);
504: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 505:
506: /* Generate additional parameters */
1.60 markus 507: rsa_generate_additional_parameters(k->rsa);
1.39 markus 508: break;
1.165 ! djm 509: case KEY_RSA_CERT:
! 510: cert = buffer_get_string(&e->request, &len);
! 511: if ((k = key_from_blob(cert, len)) == NULL)
! 512: fatal("Certificate parse failed");
! 513: xfree(cert);
! 514: key_add_private(k);
! 515: buffer_get_bignum2(&e->request, k->rsa->d);
! 516: buffer_get_bignum2(&e->request, k->rsa->iqmp);
! 517: buffer_get_bignum2(&e->request, k->rsa->p);
! 518: buffer_get_bignum2(&e->request, k->rsa->q);
! 519: break;
1.39 markus 520: default:
1.87 markus 521: buffer_clear(&e->request);
1.108 markus 522: goto send;
523: }
524: break;
525: }
526: /* enable blinding */
527: switch (k->type) {
528: case KEY_RSA:
1.165 ! djm 529: case KEY_RSA_CERT:
1.108 markus 530: case KEY_RSA1:
531: if (RSA_blinding_on(k->rsa, NULL) != 1) {
532: error("process_add_identity: RSA_blinding_on failed");
533: key_free(k);
1.33 markus 534: goto send;
1.21 markus 535: }
1.33 markus 536: break;
537: }
1.87 markus 538: comment = buffer_get_string(&e->request, NULL);
1.33 markus 539: if (k == NULL) {
540: xfree(comment);
541: goto send;
542: }
1.94 markus 543: while (buffer_len(&e->request)) {
1.158 djm 544: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 545: case SSH_AGENT_CONSTRAIN_LIFETIME:
546: death = time(NULL) + buffer_get_int(&e->request);
547: break;
1.107 markus 548: case SSH_AGENT_CONSTRAIN_CONFIRM:
549: confirm = 1;
550: break;
1.94 markus 551: default:
1.158 djm 552: error("process_add_identity: "
553: "Unknown constraint type %d", type);
554: xfree(comment);
555: key_free(k);
556: goto send;
1.94 markus 557: }
558: }
1.158 djm 559: success = 1;
1.106 marc 560: if (lifetime && !death)
561: death = time(NULL) + lifetime;
1.157 canacar 562: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 563: id = xcalloc(1, sizeof(Identity));
1.78 provos 564: id->key = k;
565: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 566: /* Increment the number of identities. */
567: tab->nentries++;
568: } else {
569: key_free(k);
1.157 canacar 570: xfree(id->comment);
1.33 markus 571: }
1.157 canacar 572: id->comment = comment;
573: id->death = death;
574: id->confirm = confirm;
1.33 markus 575: send:
1.1 deraadt 576: buffer_put_int(&e->output, 1);
1.33 markus 577: buffer_put_char(&e->output,
578: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 579: }
580:
1.88 markus 581: /* XXX todo: encrypt sensitive data with passphrase */
582: static void
583: process_lock_agent(SocketEntry *e, int lock)
584: {
1.96 deraadt 585: int success = 0;
1.88 markus 586: char *passwd;
587:
588: passwd = buffer_get_string(&e->request, NULL);
589: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
590: locked = 0;
591: memset(lock_passwd, 0, strlen(lock_passwd));
592: xfree(lock_passwd);
593: lock_passwd = NULL;
594: success = 1;
595: } else if (!locked && lock) {
596: locked = 1;
597: lock_passwd = xstrdup(passwd);
598: success = 1;
599: }
600: memset(passwd, 0, strlen(passwd));
601: xfree(passwd);
1.95 deraadt 602:
1.88 markus 603: buffer_put_int(&e->output, 1);
604: buffer_put_char(&e->output,
605: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
606: }
607:
608: static void
609: no_identities(SocketEntry *e, u_int type)
610: {
611: Buffer msg;
612:
613: buffer_init(&msg);
614: buffer_put_char(&msg,
615: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
616: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
617: buffer_put_int(&msg, 0);
618: buffer_put_int(&e->output, buffer_len(&msg));
619: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
620: buffer_free(&msg);
621: }
1.59 markus 622:
1.163 markus 623: #ifdef ENABLE_PKCS11
1.59 markus 624: static void
1.158 djm 625: process_add_smartcard_key(SocketEntry *e)
1.59 markus 626: {
1.163 markus 627: char *provider = NULL, *pin;
628: int i, type, version, count = 0, success = 0, death = 0, confirm = 0;
629: Key **keys = NULL, *k;
1.84 markus 630: Identity *id;
1.59 markus 631: Idtab *tab;
1.75 deraadt 632:
1.163 markus 633: provider = buffer_get_string(&e->request, NULL);
1.87 markus 634: pin = buffer_get_string(&e->request, NULL);
1.110 djm 635:
636: while (buffer_len(&e->request)) {
1.158 djm 637: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 638: case SSH_AGENT_CONSTRAIN_LIFETIME:
639: death = time(NULL) + buffer_get_int(&e->request);
640: break;
641: case SSH_AGENT_CONSTRAIN_CONFIRM:
642: confirm = 1;
643: break;
644: default:
1.158 djm 645: error("process_add_smartcard_key: "
646: "Unknown constraint type %d", type);
647: goto send;
1.110 djm 648: }
649: }
650: if (lifetime && !death)
651: death = time(NULL) + lifetime;
652:
1.163 markus 653: count = pkcs11_add_provider(provider, pin, &keys);
654: for (i = 0; i < count; i++) {
1.84 markus 655: k = keys[i];
656: version = k->type == KEY_RSA1 ? 1 : 2;
657: tab = idtab_lookup(version);
658: if (lookup_identity(k, version) == NULL) {
1.163 markus 659: id = xcalloc(1, sizeof(Identity));
1.84 markus 660: id->key = k;
1.163 markus 661: id->provider = xstrdup(provider);
662: id->comment = xstrdup(provider); /* XXX */
1.110 djm 663: id->death = death;
664: id->confirm = confirm;
1.84 markus 665: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
666: tab->nentries++;
667: success = 1;
668: } else {
669: key_free(k);
670: }
671: keys[i] = NULL;
1.59 markus 672: }
673: send:
1.163 markus 674: if (pin)
675: xfree(pin);
676: if (provider)
677: xfree(provider);
678: if (keys)
679: xfree(keys);
1.59 markus 680: buffer_put_int(&e->output, 1);
681: buffer_put_char(&e->output,
682: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
683: }
684:
685: static void
686: process_remove_smartcard_key(SocketEntry *e)
687: {
1.163 markus 688: char *provider = NULL, *pin = NULL;
689: int version, success = 0;
690: Identity *id, *nxt;
1.84 markus 691: Idtab *tab;
1.59 markus 692:
1.163 markus 693: provider = buffer_get_string(&e->request, NULL);
1.87 markus 694: pin = buffer_get_string(&e->request, NULL);
1.83 rees 695: xfree(pin);
1.59 markus 696:
1.163 markus 697: for (version = 1; version < 3; version++) {
698: tab = idtab_lookup(version);
699: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
700: nxt = TAILQ_NEXT(id, next);
701: if (!strcmp(provider, id->provider)) {
702: TAILQ_REMOVE(&tab->idlist, id, next);
703: free_identity(id);
704: tab->nentries--;
705: }
1.59 markus 706: }
707: }
1.163 markus 708: if (pkcs11_del_provider(provider) == 0)
709: success = 1;
710: else
711: error("process_remove_smartcard_key:"
712: " pkcs11_del_provider failed");
713: xfree(provider);
1.59 markus 714: buffer_put_int(&e->output, 1);
715: buffer_put_char(&e->output,
716: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
717: }
1.163 markus 718: #endif /* ENABLE_PKCS11 */
1.59 markus 719:
1.33 markus 720: /* dispatch incoming messages */
721:
1.55 itojun 722: static void
1.2 provos 723: process_message(SocketEntry *e)
1.1 deraadt 724: {
1.96 deraadt 725: u_int msg_len, type;
1.45 markus 726: u_char *cp;
1.89 markus 727:
1.21 markus 728: if (buffer_len(&e->input) < 5)
729: return; /* Incomplete message. */
1.77 stevesk 730: cp = buffer_ptr(&e->input);
1.137 djm 731: msg_len = get_u32(cp);
1.21 markus 732: if (msg_len > 256 * 1024) {
1.101 stevesk 733: close_socket(e);
1.21 markus 734: return;
735: }
736: if (buffer_len(&e->input) < msg_len + 4)
737: return;
1.87 markus 738:
739: /* move the current input to e->request */
1.21 markus 740: buffer_consume(&e->input, 4);
1.87 markus 741: buffer_clear(&e->request);
742: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
743: buffer_consume(&e->input, msg_len);
744: type = buffer_get_char(&e->request);
1.21 markus 745:
1.88 markus 746: /* check wheter agent is locked */
747: if (locked && type != SSH_AGENTC_UNLOCK) {
748: buffer_clear(&e->request);
749: switch (type) {
750: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
751: case SSH2_AGENTC_REQUEST_IDENTITIES:
752: /* send empty lists */
753: no_identities(e, type);
754: break;
755: default:
756: /* send a fail message for all other request types */
757: buffer_put_int(&e->output, 1);
758: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
759: }
760: return;
761: }
762:
1.59 markus 763: debug("type %d", type);
1.21 markus 764: switch (type) {
1.88 markus 765: case SSH_AGENTC_LOCK:
766: case SSH_AGENTC_UNLOCK:
767: process_lock_agent(e, type == SSH_AGENTC_LOCK);
768: break;
1.33 markus 769: /* ssh1 */
770: case SSH_AGENTC_RSA_CHALLENGE:
771: process_authentication_challenge1(e);
772: break;
1.21 markus 773: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 774: process_request_identities(e, 1);
1.21 markus 775: break;
776: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 777: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 778: process_add_identity(e, 1);
1.21 markus 779: break;
780: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 781: process_remove_identity(e, 1);
1.21 markus 782: break;
783: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 784: process_remove_all_identities(e, 1);
785: break;
786: /* ssh2 */
787: case SSH2_AGENTC_SIGN_REQUEST:
788: process_sign_request2(e);
789: break;
790: case SSH2_AGENTC_REQUEST_IDENTITIES:
791: process_request_identities(e, 2);
792: break;
793: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 794: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 795: process_add_identity(e, 2);
796: break;
797: case SSH2_AGENTC_REMOVE_IDENTITY:
798: process_remove_identity(e, 2);
799: break;
800: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
801: process_remove_all_identities(e, 2);
1.21 markus 802: break;
1.163 markus 803: #ifdef ENABLE_PKCS11
1.59 markus 804: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 805: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 806: process_add_smartcard_key(e);
1.75 deraadt 807: break;
1.59 markus 808: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
809: process_remove_smartcard_key(e);
1.75 deraadt 810: break;
1.163 markus 811: #endif /* ENABLE_PKCS11 */
1.21 markus 812: default:
813: /* Unknown message. Respond with failure. */
814: error("Unknown message %d", type);
1.87 markus 815: buffer_clear(&e->request);
1.21 markus 816: buffer_put_int(&e->output, 1);
817: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
818: break;
819: }
1.1 deraadt 820: }
821:
1.55 itojun 822: static void
1.73 stevesk 823: new_socket(sock_type type, int fd)
1.1 deraadt 824: {
1.112 markus 825: u_int i, old_alloc, new_alloc;
1.96 deraadt 826:
1.119 djm 827: set_nonblock(fd);
1.21 markus 828:
829: if (fd > max_fd)
830: max_fd = fd;
831:
832: for (i = 0; i < sockets_alloc; i++)
833: if (sockets[i].type == AUTH_UNUSED) {
834: sockets[i].fd = fd;
835: buffer_init(&sockets[i].input);
836: buffer_init(&sockets[i].output);
1.87 markus 837: buffer_init(&sockets[i].request);
1.112 markus 838: sockets[i].type = type;
1.21 markus 839: return;
840: }
841: old_alloc = sockets_alloc;
1.112 markus 842: new_alloc = sockets_alloc + 10;
1.133 djm 843: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 844: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 845: sockets[i].type = AUTH_UNUSED;
1.112 markus 846: sockets_alloc = new_alloc;
1.21 markus 847: sockets[old_alloc].fd = fd;
848: buffer_init(&sockets[old_alloc].input);
849: buffer_init(&sockets[old_alloc].output);
1.87 markus 850: buffer_init(&sockets[old_alloc].request);
1.112 markus 851: sockets[old_alloc].type = type;
1.1 deraadt 852: }
853:
1.55 itojun 854: static int
1.155 dtucker 855: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
856: struct timeval **tvpp)
1.1 deraadt 857: {
1.155 dtucker 858: u_int i, sz, deadline;
1.46 markus 859: int n = 0;
1.155 dtucker 860: static struct timeval tv;
1.46 markus 861:
862: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 863: switch (sockets[i].type) {
864: case AUTH_SOCKET:
865: case AUTH_CONNECTION:
1.46 markus 866: n = MAX(n, sockets[i].fd);
1.21 markus 867: break;
868: case AUTH_UNUSED:
869: break;
870: default:
871: fatal("Unknown socket type %d", sockets[i].type);
872: break;
873: }
1.46 markus 874: }
875:
876: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 877: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 878: if (*fdrp)
1.54 stevesk 879: xfree(*fdrp);
1.46 markus 880: if (*fdwp)
1.54 stevesk 881: xfree(*fdwp);
1.46 markus 882: *fdrp = xmalloc(sz);
883: *fdwp = xmalloc(sz);
1.66 markus 884: *nallocp = sz;
1.46 markus 885: }
1.66 markus 886: if (n < *fdl)
887: debug("XXX shrink: %d < %d", n, *fdl);
888: *fdl = n;
1.46 markus 889: memset(*fdrp, 0, sz);
890: memset(*fdwp, 0, sz);
891:
892: for (i = 0; i < sockets_alloc; i++) {
893: switch (sockets[i].type) {
894: case AUTH_SOCKET:
895: case AUTH_CONNECTION:
896: FD_SET(sockets[i].fd, *fdrp);
897: if (buffer_len(&sockets[i].output) > 0)
898: FD_SET(sockets[i].fd, *fdwp);
899: break;
900: default:
901: break;
902: }
903: }
1.155 dtucker 904: deadline = reaper();
905: if (parent_alive_interval != 0)
906: deadline = (deadline == 0) ? parent_alive_interval :
907: MIN(deadline, parent_alive_interval);
908: if (deadline == 0) {
909: *tvpp = NULL;
910: } else {
911: tv.tv_sec = deadline;
912: tv.tv_usec = 0;
913: *tvpp = &tv;
914: }
1.46 markus 915: return (1);
1.21 markus 916: }
917:
1.55 itojun 918: static void
1.21 markus 919: after_select(fd_set *readset, fd_set *writeset)
920: {
1.96 deraadt 921: struct sockaddr_un sunaddr;
1.26 markus 922: socklen_t slen;
1.21 markus 923: char buf[1024];
1.96 deraadt 924: int len, sock;
1.162 djm 925: u_int i, orig_alloc;
1.103 markus 926: uid_t euid;
927: gid_t egid;
1.21 markus 928:
1.162 djm 929: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 930: switch (sockets[i].type) {
931: case AUTH_UNUSED:
932: break;
933: case AUTH_SOCKET:
934: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 935: slen = sizeof(sunaddr);
1.46 markus 936: sock = accept(sockets[i].fd,
1.131 deraadt 937: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 938: if (sock < 0) {
1.81 stevesk 939: error("accept from AUTH_SOCKET: %s",
940: strerror(errno));
1.103 markus 941: break;
942: }
943: if (getpeereid(sock, &euid, &egid) < 0) {
944: error("getpeereid %d failed: %s",
945: sock, strerror(errno));
946: close(sock);
947: break;
948: }
1.105 markus 949: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 950: error("uid mismatch: "
1.104 stevesk 951: "peer euid %u != uid %u",
952: (u_int) euid, (u_int) getuid());
1.103 markus 953: close(sock);
1.21 markus 954: break;
955: }
956: new_socket(AUTH_CONNECTION, sock);
957: }
958: break;
959: case AUTH_CONNECTION:
960: if (buffer_len(&sockets[i].output) > 0 &&
961: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 962: len = write(sockets[i].fd,
963: buffer_ptr(&sockets[i].output),
964: buffer_len(&sockets[i].output));
965: if (len == -1 && (errno == EAGAIN ||
966: errno == EINTR))
967: continue;
1.21 markus 968: if (len <= 0) {
1.101 stevesk 969: close_socket(&sockets[i]);
1.21 markus 970: break;
971: }
972: buffer_consume(&sockets[i].output, len);
973: }
974: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 975: len = read(sockets[i].fd, buf, sizeof(buf));
976: if (len == -1 && (errno == EAGAIN ||
977: errno == EINTR))
978: continue;
1.21 markus 979: if (len <= 0) {
1.101 stevesk 980: close_socket(&sockets[i]);
1.21 markus 981: break;
982: }
983: buffer_append(&sockets[i].input, buf, len);
984: process_message(&sockets[i]);
985: }
986: break;
987: default:
988: fatal("Unknown type %d", sockets[i].type);
989: }
1.1 deraadt 990: }
991:
1.55 itojun 992: static void
1.113 markus 993: cleanup_socket(void)
1.15 markus 994: {
1.48 deraadt 995: if (socket_name[0])
996: unlink(socket_name);
997: if (socket_dir[0])
998: rmdir(socket_dir);
1.10 markus 999: }
1000:
1.114 markus 1001: void
1.15 markus 1002: cleanup_exit(int i)
1003: {
1.113 markus 1004: cleanup_socket();
1005: _exit(i);
1.15 markus 1006: }
1007:
1.135 deraadt 1008: /*ARGSUSED*/
1.55 itojun 1009: static void
1.48 deraadt 1010: cleanup_handler(int sig)
1011: {
1.113 markus 1012: cleanup_socket();
1.163 markus 1013: #ifdef ENABLE_PKCS11
1014: pkcs11_terminate();
1015: #endif
1.48 deraadt 1016: _exit(2);
1.113 markus 1017: }
1018:
1.68 markus 1019: static void
1.155 dtucker 1020: check_parent_exists(void)
1.68 markus 1021: {
1022: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
1023: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1024: cleanup_socket();
1025: _exit(2);
1.68 markus 1026: }
1.48 deraadt 1027: }
1028:
1.55 itojun 1029: static void
1.50 itojun 1030: usage(void)
1.15 markus 1031: {
1.156 sobrado 1032: fprintf(stderr, "usage: %s [options] [command [arg ...]]\n",
1.46 markus 1033: __progname);
1.72 jakob 1034: fprintf(stderr, "Options:\n");
1035: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
1036: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
1037: fprintf(stderr, " -k Kill the current agent.\n");
1038: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 1039: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 1040: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 1041: exit(1);
1.15 markus 1042: }
1043:
1.2 provos 1044: int
1045: main(int ac, char **av)
1.1 deraadt 1046: {
1.107 markus 1047: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1048: int sock, fd, ch, result, saved_errno;
1.120 avsm 1049: u_int nalloc;
1.96 deraadt 1050: char *shell, *format, *pidstr, *agentsocket = NULL;
1051: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1052: struct sockaddr_un sunaddr;
1.41 markus 1053: struct rlimit rlim;
1.96 deraadt 1054: extern int optind;
1.98 stevesk 1055: extern char *optarg;
1.21 markus 1056: pid_t pid;
1.96 deraadt 1057: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1058: struct timeval *tvp = NULL;
1.161 tobias 1059: size_t len;
1.123 djm 1060:
1061: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1062: sanitise_stdfd();
1.99 markus 1063:
1064: /* drop */
1065: setegid(getgid());
1066: setgid(getgid());
1.53 markus 1067:
1068: SSLeay_add_all_algorithms();
1.21 markus 1069:
1.106 marc 1070: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1071: switch (ch) {
1072: case 'c':
1073: if (s_flag)
1074: usage();
1075: c_flag++;
1076: break;
1077: case 'k':
1078: k_flag++;
1079: break;
1080: case 's':
1081: if (c_flag)
1082: usage();
1083: s_flag++;
1084: break;
1.57 markus 1085: case 'd':
1086: if (d_flag)
1087: usage();
1088: d_flag++;
1089: break;
1.86 markus 1090: case 'a':
1091: agentsocket = optarg;
1.106 marc 1092: break;
1093: case 't':
1094: if ((lifetime = convtime(optarg)) == -1) {
1095: fprintf(stderr, "Invalid lifetime\n");
1096: usage();
1097: }
1.86 markus 1098: break;
1.21 markus 1099: default:
1100: usage();
1101: }
1102: }
1103: ac -= optind;
1104: av += optind;
1105:
1.57 markus 1106: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1107: usage();
1108:
1.85 markus 1109: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1110: shell = getenv("SHELL");
1.161 tobias 1111: if (shell != NULL && (len = strlen(shell)) > 2 &&
1112: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1113: c_flag = 1;
1114: }
1115: if (k_flag) {
1.136 deraadt 1116: const char *errstr = NULL;
1117:
1.21 markus 1118: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1119: if (pidstr == NULL) {
1120: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1121: SSH_AGENTPID_ENV_NAME);
1.21 markus 1122: exit(1);
1123: }
1.136 deraadt 1124: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1125: if (errstr) {
1126: fprintf(stderr,
1127: "%s=\"%s\", which is not a good PID: %s\n",
1128: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1129: exit(1);
1130: }
1131: if (kill(pid, SIGTERM) == -1) {
1132: perror("kill");
1133: exit(1);
1134: }
1135: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1136: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1137: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1138: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1139: exit(0);
1140: }
1141: parent_pid = getpid();
1142:
1.86 markus 1143: if (agentsocket == NULL) {
1144: /* Create private directory for agent socket */
1.115 markus 1145: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1146: if (mkdtemp(socket_dir) == NULL) {
1147: perror("mkdtemp: private socket dir");
1148: exit(1);
1149: }
1.91 mpech 1150: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1151: (long)parent_pid);
1.86 markus 1152: } else {
1153: /* Try to use specified agent socket */
1154: socket_dir[0] = '\0';
1155: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1156: }
1157:
1.23 markus 1158: /*
1159: * Create socket early so it will exist before command gets run from
1160: * the parent.
1161: */
1.21 markus 1162: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1163: if (sock < 0) {
1164: perror("socket");
1.121 djm 1165: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1166: cleanup_exit(1);
1167: }
1168: memset(&sunaddr, 0, sizeof(sunaddr));
1169: sunaddr.sun_family = AF_UNIX;
1170: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1171: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1172: perror("bind");
1.121 djm 1173: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1174: cleanup_exit(1);
1175: }
1.117 markus 1176: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1177: perror("listen");
1178: cleanup_exit(1);
1179: }
1.46 markus 1180:
1.23 markus 1181: /*
1182: * Fork, and have the parent execute the command, if any, or present
1183: * the socket data. The child continues as the authentication agent.
1184: */
1.57 markus 1185: if (d_flag) {
1186: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1187: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1188: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1189: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1190: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1191: goto skip;
1192: }
1.21 markus 1193: pid = fork();
1194: if (pid == -1) {
1195: perror("fork");
1.81 stevesk 1196: cleanup_exit(1);
1.21 markus 1197: }
1198: if (pid != 0) { /* Parent - execute the given command. */
1199: close(sock);
1.91 mpech 1200: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1201: if (ac == 0) {
1202: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1203: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1204: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1205: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1206: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1207: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1208: exit(0);
1209: }
1.36 deraadt 1210: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1211: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1212: perror("setenv");
1213: exit(1);
1214: }
1.21 markus 1215: execvp(av[0], av);
1216: perror(av[0]);
1217: exit(1);
1218: }
1.81 stevesk 1219: /* child */
1220: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1221:
1222: if (setsid() == -1) {
1.81 stevesk 1223: error("setsid: %s", strerror(errno));
1.67 stevesk 1224: cleanup_exit(1);
1225: }
1226:
1227: (void)chdir("/");
1.107 markus 1228: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1229: /* XXX might close listen socket */
1230: (void)dup2(fd, STDIN_FILENO);
1231: (void)dup2(fd, STDOUT_FILENO);
1232: (void)dup2(fd, STDERR_FILENO);
1233: if (fd > 2)
1234: close(fd);
1235: }
1.21 markus 1236:
1.41 markus 1237: /* deny core dumps, since memory contains unencrypted private keys */
1238: rlim.rlim_cur = rlim.rlim_max = 0;
1239: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1240: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1241: cleanup_exit(1);
1242: }
1.57 markus 1243:
1244: skip:
1.163 markus 1245:
1246: #ifdef ENABLE_PKCS11
1247: pkcs11_init(0);
1248: #endif
1.21 markus 1249: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1250: if (ac > 0)
1251: parent_alive_interval = 10;
1.33 markus 1252: idtab_init();
1.61 markus 1253: if (!d_flag)
1.57 markus 1254: signal(SIGINT, SIG_IGN);
1.61 markus 1255: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1256: signal(SIGHUP, cleanup_handler);
1257: signal(SIGTERM, cleanup_handler);
1.66 markus 1258: nalloc = 0;
1259:
1.21 markus 1260: while (1) {
1.155 dtucker 1261: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1262: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1263: saved_errno = errno;
1.155 dtucker 1264: if (parent_alive_interval != 0)
1265: check_parent_exists();
1266: (void) reaper(); /* remove expired keys */
1.154 dtucker 1267: if (result < 0) {
1268: if (saved_errno == EINTR)
1.21 markus 1269: continue;
1.154 dtucker 1270: fatal("select: %s", strerror(saved_errno));
1271: } else if (result > 0)
1272: after_select(readsetp, writesetp);
1.15 markus 1273: }
1.21 markus 1274: /* NOTREACHED */
1.1 deraadt 1275: }