Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.194
1.194 ! markus 1: /* $OpenBSD: ssh-agent.c,v 1.193 2014/12/21 23:35:14 jmc 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>
1.141 stevesk 41: #include <sys/socket.h>
1.189 djm 42: #include <sys/stat.h>
1.128 stevesk 43: #include <sys/un.h>
1.148 stevesk 44: #include <sys/param.h>
1.126 stevesk 45:
1.185 markus 46: #ifdef WITH_OPENSSL
1.146 stevesk 47: #include <openssl/evp.h>
1.185 markus 48: #endif
1.146 stevesk 49:
1.143 stevesk 50: #include <errno.h>
1.142 stevesk 51: #include <fcntl.h>
1.126 stevesk 52: #include <paths.h>
1.129 stevesk 53: #include <signal.h>
1.149 stevesk 54: #include <stdlib.h>
1.150 stevesk 55: #include <stdio.h>
1.146 stevesk 56: #include <string.h>
1.145 stevesk 57: #include <time.h>
1.144 stevesk 58: #include <unistd.h>
1.1 deraadt 59:
1.194 ! markus 60: #include "key.h" /* XXX for typedef */
! 61: #include "buffer.h" /* XXX for typedef */
! 62:
1.151 deraadt 63: #include "xmalloc.h"
1.1 deraadt 64: #include "ssh.h"
65: #include "rsa.h"
1.194 ! markus 66: #include "sshbuf.h"
! 67: #include "sshkey.h"
1.32 markus 68: #include "authfd.h"
1.37 markus 69: #include "compat.h"
1.47 markus 70: #include "log.h"
1.107 markus 71: #include "misc.h"
1.182 markus 72: #include "digest.h"
1.194 ! markus 73: #include "ssherr.h"
1.7 deraadt 74:
1.163 markus 75: #ifdef ENABLE_PKCS11
76: #include "ssh-pkcs11.h"
1.71 jakob 77: #endif
1.59 markus 78:
1.73 stevesk 79: typedef enum {
80: AUTH_UNUSED,
81: AUTH_SOCKET,
82: AUTH_CONNECTION
83: } sock_type;
84:
1.21 markus 85: typedef struct {
86: int fd;
1.73 stevesk 87: sock_type type;
1.194 ! markus 88: struct sshbuf *input;
! 89: struct sshbuf *output;
! 90: struct sshbuf *request;
1.1 deraadt 91: } SocketEntry;
92:
1.45 markus 93: u_int sockets_alloc = 0;
1.1 deraadt 94: SocketEntry *sockets = NULL;
95:
1.78 provos 96: typedef struct identity {
97: TAILQ_ENTRY(identity) next;
1.194 ! markus 98: struct sshkey *key;
1.21 markus 99: char *comment;
1.163 markus 100: char *provider;
1.174 dtucker 101: time_t death;
1.107 markus 102: u_int confirm;
1.1 deraadt 103: } Identity;
104:
1.33 markus 105: typedef struct {
106: int nentries;
1.78 provos 107: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 108: } Idtab;
109:
110: /* private key table, one per protocol version */
111: Idtab idtable[3];
1.1 deraadt 112:
113: int max_fd = 0;
114:
1.11 markus 115: /* pid of shell == parent of agent */
1.29 deraadt 116: pid_t parent_pid = -1;
1.176 dtucker 117: time_t parent_alive_interval = 0;
1.10 markus 118:
1.187 djm 119: /* pid of process for which cleanup_socket is applicable */
120: pid_t cleanup_pid = 0;
121:
1.10 markus 122: /* pathname and directory for AUTH_SOCKET */
1.132 djm 123: char socket_name[MAXPATHLEN];
124: char socket_dir[MAXPATHLEN];
1.10 markus 125:
1.88 markus 126: /* locking */
127: int locked = 0;
128: char *lock_passwd = NULL;
129:
1.20 markus 130: extern char *__progname;
131:
1.174 dtucker 132: /* Default lifetime in seconds (0 == forever) */
133: static long lifetime = 0;
1.106 marc 134:
1.192 djm 135: static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
136:
1.55 itojun 137: static void
1.101 stevesk 138: close_socket(SocketEntry *e)
139: {
140: close(e->fd);
141: e->fd = -1;
142: e->type = AUTH_UNUSED;
1.194 ! markus 143: sshbuf_free(e->input);
! 144: sshbuf_free(e->output);
! 145: sshbuf_free(e->request);
1.101 stevesk 146: }
147:
148: static void
1.33 markus 149: idtab_init(void)
1.1 deraadt 150: {
1.33 markus 151: int i;
1.96 deraadt 152:
1.74 deraadt 153: for (i = 0; i <=2; i++) {
1.78 provos 154: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 155: idtable[i].nentries = 0;
156: }
157: }
158:
159: /* return private key table for requested protocol version */
1.55 itojun 160: static Idtab *
1.33 markus 161: idtab_lookup(int version)
162: {
163: if (version < 1 || version > 2)
164: fatal("internal error, bad protocol version %d", version);
165: return &idtable[version];
166: }
167:
1.89 markus 168: static void
169: free_identity(Identity *id)
170: {
1.194 ! markus 171: sshkey_free(id->key);
1.173 djm 172: free(id->provider);
173: free(id->comment);
174: free(id);
1.89 markus 175: }
176:
1.33 markus 177: /* return matching private key for given public key */
1.78 provos 178: static Identity *
1.194 ! markus 179: lookup_identity(struct sshkey *key, int version)
1.33 markus 180: {
1.78 provos 181: Identity *id;
182:
1.33 markus 183: Idtab *tab = idtab_lookup(version);
1.78 provos 184: TAILQ_FOREACH(id, &tab->idlist, next) {
1.194 ! markus 185: if (sshkey_equal(key, id->key))
1.78 provos 186: return (id);
1.33 markus 187: }
1.78 provos 188: return (NULL);
189: }
190:
1.107 markus 191: /* Check confirmation of keysign request */
192: static int
193: confirm_key(Identity *id)
194: {
1.122 djm 195: char *p;
1.107 markus 196: int ret = -1;
197:
1.194 ! markus 198: p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT);
1.122 djm 199: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
200: id->comment, p))
201: ret = 0;
1.173 djm 202: free(p);
1.122 djm 203:
1.107 markus 204: return (ret);
205: }
206:
1.194 ! markus 207: static void
! 208: send_status(SocketEntry *e, int success)
! 209: {
! 210: int r;
! 211:
! 212: if ((r = sshbuf_put_u32(e->output, 1)) != 0 ||
! 213: (r = sshbuf_put_u8(e->output, success ?
! 214: SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0)
! 215: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 216: }
! 217:
1.33 markus 218: /* send list of supported public keys to 'client' */
1.55 itojun 219: static void
1.33 markus 220: process_request_identities(SocketEntry *e, int version)
221: {
222: Idtab *tab = idtab_lookup(version);
1.96 deraadt 223: Identity *id;
1.194 ! markus 224: struct sshbuf *msg;
! 225: int r;
1.1 deraadt 226:
1.194 ! markus 227: if ((msg = sshbuf_new()) == NULL)
! 228: fatal("%s: sshbuf_new failed", __func__);
! 229: if ((r = sshbuf_put_u8(msg, (version == 1) ?
! 230: SSH_AGENT_RSA_IDENTITIES_ANSWER :
! 231: SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
! 232: (r = sshbuf_put_u32(msg, tab->nentries)) != 0)
! 233: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.78 provos 234: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 235: if (id->key->type == KEY_RSA1) {
1.185 markus 236: #ifdef WITH_SSH1
1.194 ! markus 237: if ((r = sshbuf_put_u32(msg,
! 238: BN_num_bits(id->key->rsa->n))) != 0 ||
! 239: (r = sshbuf_put_bignum1(msg,
! 240: id->key->rsa->e)) != 0 ||
! 241: (r = sshbuf_put_bignum1(msg,
! 242: id->key->rsa->n)) != 0)
! 243: fatal("%s: buffer error: %s",
! 244: __func__, ssh_err(r));
1.185 markus 245: #endif
1.33 markus 246: } else {
1.45 markus 247: u_char *blob;
1.194 ! markus 248: size_t blen;
! 249:
! 250: if ((r = sshkey_to_blob(id->key, &blob, &blen)) != 0) {
! 251: error("%s: sshkey_to_blob: %s", __func__,
! 252: ssh_err(r));
! 253: continue;
! 254: }
! 255: if ((r = sshbuf_put_string(msg, blob, blen)) != 0)
! 256: fatal("%s: buffer error: %s",
! 257: __func__, ssh_err(r));
1.173 djm 258: free(blob);
1.33 markus 259: }
1.194 ! markus 260: if ((r = sshbuf_put_cstring(msg, id->comment)) != 0)
! 261: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 262: }
1.194 ! markus 263: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
! 264: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 265: sshbuf_free(msg);
1.1 deraadt 266: }
267:
1.185 markus 268: #ifdef WITH_SSH1
1.33 markus 269: /* ssh1 only */
1.55 itojun 270: static void
1.33 markus 271: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 272: {
1.96 deraadt 273: u_char buf[32], mdbuf[16], session_id[16];
274: u_int response_type;
275: BIGNUM *challenge;
1.78 provos 276: Identity *id;
1.194 ! markus 277: int r, len;
! 278: struct sshbuf *msg;
1.182 markus 279: struct ssh_digest_ctx *md;
1.194 ! markus 280: struct sshkey *key;
1.21 markus 281:
1.194 ! markus 282: if ((msg = sshbuf_new()) == NULL)
! 283: fatal("%s: sshbuf_new failed", __func__);
! 284: if ((key = sshkey_new(KEY_RSA1)) == NULL)
! 285: fatal("%s: sshkey_new failed", __func__);
1.76 markus 286: if ((challenge = BN_new()) == NULL)
1.194 ! markus 287: fatal("%s: BN_new failed", __func__);
1.33 markus 288:
1.194 ! markus 289: if ((r = sshbuf_get_u32(e->request, NULL)) != 0 || /* ignored */
! 290: (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 ||
! 291: (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0 ||
! 292: (r = sshbuf_get_bignum1(e->request, challenge)))
! 293: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 294:
1.33 markus 295: /* Only protocol 1.1 is supported */
1.194 ! markus 296: if (sshbuf_len(e->request) == 0)
1.33 markus 297: goto failure;
1.194 ! markus 298: if ((r = sshbuf_get(e->request, session_id, sizeof(session_id))) != 0 ||
! 299: (r = sshbuf_get_u32(e->request, &response_type)) != 0)
! 300: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.33 markus 301: if (response_type != 1)
302: goto failure;
303:
1.78 provos 304: id = lookup_identity(key, 1);
1.107 markus 305: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.194 ! markus 306: struct sshkey *private = id->key;
1.33 markus 307: /* Decrypt the challenge using the private key. */
1.194 ! markus 308: if ((r = rsa_private_decrypt(challenge, challenge,
! 309: private->rsa) != 0)) {
! 310: fatal("%s: rsa_public_encrypt: %s", __func__,
! 311: ssh_err(r));
! 312: goto failure; /* XXX ? */
! 313: }
1.33 markus 314:
1.194 ! markus 315: /* The response is MD5 of decrypted challenge plus session id */
1.33 markus 316: len = BN_num_bytes(challenge);
317: if (len <= 0 || len > 32) {
1.194 ! markus 318: logit("%s: bad challenge length %d", __func__, len);
1.33 markus 319: goto failure;
320: }
321: memset(buf, 0, 32);
322: BN_bn2bin(challenge, buf + 32 - len);
1.182 markus 323: if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
324: ssh_digest_update(md, buf, 32) < 0 ||
325: ssh_digest_update(md, session_id, 16) < 0 ||
326: ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
327: fatal("%s: md5 failed", __func__);
328: ssh_digest_free(md);
1.33 markus 329:
330: /* Send the response. */
1.194 ! markus 331: if ((r = sshbuf_put_u8(msg, SSH_AGENT_RSA_RESPONSE)) != 0 ||
! 332: (r = sshbuf_put(msg, mdbuf, sizeof(mdbuf))) != 0)
! 333: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.33 markus 334: goto send;
335: }
1.21 markus 336:
1.194 ! markus 337: failure:
1.33 markus 338: /* Unknown identity or protocol error. Send failure. */
1.194 ! markus 339: if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
! 340: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 341: send:
! 342: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
! 343: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 344: sshkey_free(key);
1.33 markus 345: BN_clear_free(challenge);
1.194 ! markus 346: sshbuf_free(msg);
1.33 markus 347: }
1.185 markus 348: #endif
1.33 markus 349:
350: /* ssh2 only */
1.55 itojun 351: static void
1.33 markus 352: process_sign_request2(SocketEntry *e)
353: {
1.45 markus 354: u_char *blob, *data, *signature = NULL;
1.194 ! markus 355: size_t blen, dlen, slen = 0;
! 356: u_int compat = 0, flags;
! 357: int r, ok = -1;
! 358: struct sshbuf *msg;
! 359: struct sshkey *key;
! 360:
! 361: if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0 ||
! 362: (r = sshbuf_get_string(e->request, &data, &dlen)) != 0 ||
! 363: (r = sshbuf_get_u32(e->request, &flags)) != 0)
! 364: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.37 markus 365: if (flags & SSH_AGENT_OLD_SIGNATURE)
1.194 ! markus 366: compat = SSH_BUG_SIGBLOB;
1.33 markus 367:
1.194 ! markus 368: if ((ok = sshkey_from_blob(blob, blen, &key)) != 0)
! 369: error("%s: cannot parse key blob: %s", __func__, ssh_err(ok));
! 370: else {
1.78 provos 371: Identity *id = lookup_identity(key, 2);
1.194 ! markus 372: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
! 373: if ((ok = sshkey_sign(id->key, &signature, &slen,
! 374: data, dlen, compat)) != 0)
! 375: error("%s: sshkey_sign: %s",
! 376: __func__, ssh_err(ok));
! 377: }
! 378: sshkey_free(key);
1.33 markus 379: }
1.194 ! markus 380: if ((msg = sshbuf_new()) == NULL)
! 381: fatal("%s: sshbuf_new failed", __func__);
1.33 markus 382: if (ok == 0) {
1.194 ! markus 383: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
! 384: (r = sshbuf_put_string(msg, signature, slen)) != 0)
! 385: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 386: } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
! 387: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 388:
! 389: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
! 390: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 391:
! 392: sshbuf_free(msg);
1.173 djm 393: free(data);
394: free(blob);
395: free(signature);
1.1 deraadt 396: }
397:
1.33 markus 398: /* shared */
1.55 itojun 399: static void
1.33 markus 400: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 401: {
1.194 ! markus 402: size_t blen;
! 403: int r, success = 0;
! 404: struct sshkey *key = NULL;
1.45 markus 405: u_char *blob;
1.186 djm 406: #ifdef WITH_SSH1
407: u_int bits;
408: #endif /* WITH_SSH1 */
1.21 markus 409:
1.74 deraadt 410: switch (version) {
1.186 djm 411: #ifdef WITH_SSH1
1.33 markus 412: case 1:
1.194 ! markus 413: if ((key = sshkey_new(KEY_RSA1)) == NULL) {
! 414: error("%s: sshkey_new failed", __func__);
! 415: return;
! 416: }
! 417: if ((r = sshbuf_get_u32(e->request, &bits)) != 0 ||
! 418: (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 ||
! 419: (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0)
! 420: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 421:
! 422: if (bits != sshkey_size(key))
! 423: logit("Warning: identity keysize mismatch: "
! 424: "actual %u, announced %u",
! 425: sshkey_size(key), bits);
1.33 markus 426: break;
1.186 djm 427: #endif /* WITH_SSH1 */
1.33 markus 428: case 2:
1.194 ! markus 429: if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0)
! 430: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 431: if ((r = sshkey_from_blob(blob, blen, &key)) != 0)
! 432: error("%s: sshkey_from_blob failed: %s",
! 433: __func__, ssh_err(r));
1.173 djm 434: free(blob);
1.33 markus 435: break;
436: }
437: if (key != NULL) {
1.78 provos 438: Identity *id = lookup_identity(key, version);
439: if (id != NULL) {
1.23 markus 440: /*
441: * We have this key. Free the old key. Since we
1.124 djm 442: * don't want to leave empty slots in the middle of
1.40 markus 443: * the array, we actually free the key there and move
444: * all the entries between the empty slot and the end
445: * of the array.
1.23 markus 446: */
1.33 markus 447: Idtab *tab = idtab_lookup(version);
1.38 markus 448: if (tab->nentries < 1)
449: fatal("process_remove_identity: "
450: "internal error: tab->nentries %d",
451: tab->nentries);
1.78 provos 452: TAILQ_REMOVE(&tab->idlist, id, next);
453: free_identity(id);
1.33 markus 454: tab->nentries--;
455: success = 1;
1.21 markus 456: }
1.194 ! markus 457: sshkey_free(key);
1.33 markus 458: }
1.194 ! markus 459: send_status(e, success);
1.1 deraadt 460: }
461:
1.55 itojun 462: static void
1.33 markus 463: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 464: {
1.33 markus 465: Idtab *tab = idtab_lookup(version);
1.78 provos 466: Identity *id;
1.21 markus 467:
468: /* Loop over all identities and clear the keys. */
1.78 provos 469: for (id = TAILQ_FIRST(&tab->idlist); id;
470: id = TAILQ_FIRST(&tab->idlist)) {
471: TAILQ_REMOVE(&tab->idlist, id, next);
472: free_identity(id);
1.21 markus 473: }
474:
475: /* Mark that there are no identities. */
1.33 markus 476: tab->nentries = 0;
1.21 markus 477:
478: /* Send success. */
1.194 ! markus 479: send_status(e, 1);
1.1 deraadt 480: }
481:
1.155 dtucker 482: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 483: static time_t
1.89 markus 484: reaper(void)
485: {
1.175 dtucker 486: time_t deadline = 0, now = monotime();
1.89 markus 487: Identity *id, *nxt;
488: int version;
1.96 deraadt 489: Idtab *tab;
1.89 markus 490:
491: for (version = 1; version < 3; version++) {
492: tab = idtab_lookup(version);
493: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
494: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 495: if (id->death == 0)
496: continue;
497: if (now >= id->death) {
1.154 dtucker 498: debug("expiring key '%s'", id->comment);
1.89 markus 499: TAILQ_REMOVE(&tab->idlist, id, next);
500: free_identity(id);
501: tab->nentries--;
1.155 dtucker 502: } else
503: deadline = (deadline == 0) ? id->death :
504: MIN(deadline, id->death);
1.89 markus 505: }
506: }
1.155 dtucker 507: if (deadline == 0 || deadline <= now)
508: return 0;
509: else
510: return (deadline - now);
1.89 markus 511: }
512:
1.194 ! markus 513: /*
! 514: * XXX this and the corresponding serialisation function probably belongs
! 515: * in key.c
! 516: */
! 517: static int
! 518: agent_decode_rsa1(struct sshbuf *m, struct sshkey **kp)
! 519: {
! 520: struct sshkey *k = NULL;
! 521: int r = SSH_ERR_INTERNAL_ERROR;
! 522:
! 523: *kp = NULL;
! 524: if ((k = sshkey_new_private(KEY_RSA1)) == NULL)
! 525: return SSH_ERR_ALLOC_FAIL;
! 526:
! 527: if ((r = sshbuf_get_u32(m, NULL)) != 0 || /* ignored */
! 528: (r = sshbuf_get_bignum1(m, k->rsa->n)) != 0 ||
! 529: (r = sshbuf_get_bignum1(m, k->rsa->e)) != 0 ||
! 530: (r = sshbuf_get_bignum1(m, k->rsa->d)) != 0 ||
! 531: (r = sshbuf_get_bignum1(m, k->rsa->iqmp)) != 0 ||
! 532: /* SSH1 and SSL have p and q swapped */
! 533: (r = sshbuf_get_bignum1(m, k->rsa->q)) != 0 || /* p */
! 534: (r = sshbuf_get_bignum1(m, k->rsa->p)) != 0) /* q */
! 535: goto out;
! 536:
! 537: /* Generate additional parameters */
! 538: if ((r = rsa_generate_additional_parameters(k->rsa)) != 0)
! 539: goto out;
! 540: /* enable blinding */
! 541: if (RSA_blinding_on(k->rsa, NULL) != 1) {
! 542: r = SSH_ERR_LIBCRYPTO_ERROR;
! 543: goto out;
! 544: }
! 545:
! 546: r = 0; /* success */
! 547: out:
! 548: if (r == 0)
! 549: *kp = k;
! 550: else
! 551: sshkey_free(k);
! 552: return r;
! 553: }
! 554:
1.89 markus 555: static void
1.33 markus 556: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 557: {
1.96 deraadt 558: Idtab *tab = idtab_lookup(version);
1.157 canacar 559: Identity *id;
1.194 ! markus 560: int success = 0, confirm = 0;
! 561: u_int seconds;
! 562: char *comment = NULL;
1.174 dtucker 563: time_t death = 0;
1.194 ! markus 564: struct sshkey *k = NULL;
! 565: u_char ctype;
! 566: int r = SSH_ERR_INTERNAL_ERROR;
1.33 markus 567:
568: switch (version) {
1.186 djm 569: #ifdef WITH_SSH1
1.33 markus 570: case 1:
1.194 ! markus 571: r = agent_decode_rsa1(e->request, &k);
1.33 markus 572: break;
1.186 djm 573: #endif /* WITH_SSH1 */
1.33 markus 574: case 2:
1.194 ! markus 575: r = sshkey_private_deserialize(e->request, &k);
1.33 markus 576: break;
577: }
1.194 ! markus 578: if (r != 0 || k == NULL ||
! 579: (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
! 580: error("%s: decode private key: %s", __func__, ssh_err(r));
! 581: goto err;
! 582: }
1.186 djm 583:
1.194 ! markus 584: while (sshbuf_len(e->request)) {
! 585: if ((r = sshbuf_get_u8(e->request, &ctype)) != 0) {
! 586: error("%s: buffer error: %s", __func__, ssh_err(r));
! 587: goto err;
! 588: }
! 589: switch (ctype) {
1.94 markus 590: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.194 ! markus 591: if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) {
! 592: error("%s: bad lifetime constraint: %s",
! 593: __func__, ssh_err(r));
! 594: goto err;
! 595: }
! 596: death = monotime() + seconds;
1.94 markus 597: break;
1.107 markus 598: case SSH_AGENT_CONSTRAIN_CONFIRM:
599: confirm = 1;
600: break;
1.94 markus 601: default:
1.194 ! markus 602: error("%s: Unknown constraint %d", __func__, ctype);
! 603: err:
! 604: sshbuf_reset(e->request);
1.173 djm 605: free(comment);
1.194 ! markus 606: sshkey_free(k);
1.158 djm 607: goto send;
1.94 markus 608: }
609: }
1.194 ! markus 610:
1.158 djm 611: success = 1;
1.106 marc 612: if (lifetime && !death)
1.175 dtucker 613: death = monotime() + lifetime;
1.157 canacar 614: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 615: id = xcalloc(1, sizeof(Identity));
1.78 provos 616: id->key = k;
617: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 618: /* Increment the number of identities. */
619: tab->nentries++;
620: } else {
1.194 ! markus 621: sshkey_free(k);
1.173 djm 622: free(id->comment);
1.33 markus 623: }
1.157 canacar 624: id->comment = comment;
625: id->death = death;
626: id->confirm = confirm;
1.33 markus 627: send:
1.194 ! markus 628: send_status(e, success);
1.1 deraadt 629: }
630:
1.88 markus 631: /* XXX todo: encrypt sensitive data with passphrase */
632: static void
633: process_lock_agent(SocketEntry *e, int lock)
634: {
1.194 ! markus 635: int r, success = 0;
1.88 markus 636: char *passwd;
637:
1.194 ! markus 638: if ((r = sshbuf_get_cstring(e->request, &passwd, NULL)) != 0)
! 639: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.88 markus 640: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
641: locked = 0;
1.183 djm 642: explicit_bzero(lock_passwd, strlen(lock_passwd));
1.173 djm 643: free(lock_passwd);
1.88 markus 644: lock_passwd = NULL;
645: success = 1;
646: } else if (!locked && lock) {
647: locked = 1;
648: lock_passwd = xstrdup(passwd);
649: success = 1;
650: }
1.183 djm 651: explicit_bzero(passwd, strlen(passwd));
1.173 djm 652: free(passwd);
1.194 ! markus 653: send_status(e, success);
1.88 markus 654: }
655:
656: static void
657: no_identities(SocketEntry *e, u_int type)
658: {
1.194 ! markus 659: struct sshbuf *msg;
! 660: int r;
1.88 markus 661:
1.194 ! markus 662: if ((msg = sshbuf_new()) == NULL)
! 663: fatal("%s: sshbuf_new failed", __func__);
! 664: if ((r = sshbuf_put_u8(msg,
1.88 markus 665: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
1.194 ! markus 666: SSH_AGENT_RSA_IDENTITIES_ANSWER :
! 667: SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
! 668: (r = sshbuf_put_u32(msg, 0)) != 0 ||
! 669: (r = sshbuf_put_stringb(e->output, msg)) != 0)
! 670: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 671: sshbuf_free(msg);
1.88 markus 672: }
1.59 markus 673:
1.163 markus 674: #ifdef ENABLE_PKCS11
1.59 markus 675: static void
1.158 djm 676: process_add_smartcard_key(SocketEntry *e)
1.59 markus 677: {
1.163 markus 678: char *provider = NULL, *pin;
1.194 ! markus 679: int r, i, version, count = 0, success = 0, confirm = 0;
! 680: u_int seconds;
1.174 dtucker 681: time_t death = 0;
1.194 ! markus 682: u_char type;
! 683: struct sshkey **keys = NULL, *k;
1.84 markus 684: Identity *id;
1.59 markus 685: Idtab *tab;
1.75 deraadt 686:
1.194 ! markus 687: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
! 688: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
! 689: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 690:
! 691: while (sshbuf_len(e->request)) {
! 692: if ((r = sshbuf_get_u8(e->request, &type)) != 0)
! 693: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 694: switch (type) {
1.110 djm 695: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.194 ! markus 696: if ((r = sshbuf_get_u32(e->request, &seconds)) != 0)
! 697: fatal("%s: buffer error: %s",
! 698: __func__, ssh_err(r));
! 699: death = monotime() + seconds;
1.110 djm 700: break;
701: case SSH_AGENT_CONSTRAIN_CONFIRM:
702: confirm = 1;
703: break;
704: default:
1.158 djm 705: error("process_add_smartcard_key: "
706: "Unknown constraint type %d", type);
707: goto send;
1.110 djm 708: }
709: }
710: if (lifetime && !death)
1.175 dtucker 711: death = monotime() + lifetime;
1.110 djm 712:
1.163 markus 713: count = pkcs11_add_provider(provider, pin, &keys);
714: for (i = 0; i < count; i++) {
1.84 markus 715: k = keys[i];
716: version = k->type == KEY_RSA1 ? 1 : 2;
717: tab = idtab_lookup(version);
718: if (lookup_identity(k, version) == NULL) {
1.163 markus 719: id = xcalloc(1, sizeof(Identity));
1.84 markus 720: id->key = k;
1.163 markus 721: id->provider = xstrdup(provider);
722: id->comment = xstrdup(provider); /* XXX */
1.110 djm 723: id->death = death;
724: id->confirm = confirm;
1.84 markus 725: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
726: tab->nentries++;
727: success = 1;
728: } else {
1.194 ! markus 729: sshkey_free(k);
1.84 markus 730: }
731: keys[i] = NULL;
1.59 markus 732: }
733: send:
1.173 djm 734: free(pin);
735: free(provider);
736: free(keys);
1.194 ! markus 737: send_status(e, success);
1.59 markus 738: }
739:
740: static void
741: process_remove_smartcard_key(SocketEntry *e)
742: {
1.163 markus 743: char *provider = NULL, *pin = NULL;
1.194 ! markus 744: int r, version, success = 0;
1.163 markus 745: Identity *id, *nxt;
1.84 markus 746: Idtab *tab;
1.59 markus 747:
1.194 ! markus 748: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
! 749: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
! 750: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.173 djm 751: free(pin);
1.59 markus 752:
1.163 markus 753: for (version = 1; version < 3; version++) {
754: tab = idtab_lookup(version);
755: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
756: nxt = TAILQ_NEXT(id, next);
1.181 djm 757: /* Skip file--based keys */
758: if (id->provider == NULL)
759: continue;
1.163 markus 760: if (!strcmp(provider, id->provider)) {
761: TAILQ_REMOVE(&tab->idlist, id, next);
762: free_identity(id);
763: tab->nentries--;
764: }
1.59 markus 765: }
766: }
1.163 markus 767: if (pkcs11_del_provider(provider) == 0)
768: success = 1;
769: else
770: error("process_remove_smartcard_key:"
771: " pkcs11_del_provider failed");
1.173 djm 772: free(provider);
1.194 ! markus 773: send_status(e, success);
1.59 markus 774: }
1.163 markus 775: #endif /* ENABLE_PKCS11 */
1.59 markus 776:
1.33 markus 777: /* dispatch incoming messages */
778:
1.55 itojun 779: static void
1.2 provos 780: process_message(SocketEntry *e)
1.1 deraadt 781: {
1.194 ! markus 782: u_int msg_len;
! 783: u_char type;
! 784: const u_char *cp;
! 785: int r;
1.89 markus 786:
1.194 ! markus 787: if (sshbuf_len(e->input) < 5)
1.21 markus 788: return; /* Incomplete message. */
1.194 ! markus 789: cp = sshbuf_ptr(e->input);
! 790: msg_len = PEEK_U32(cp);
1.21 markus 791: if (msg_len > 256 * 1024) {
1.101 stevesk 792: close_socket(e);
1.21 markus 793: return;
794: }
1.194 ! markus 795: if (sshbuf_len(e->input) < msg_len + 4)
1.21 markus 796: return;
1.87 markus 797:
798: /* move the current input to e->request */
1.194 ! markus 799: sshbuf_reset(e->request);
! 800: if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
! 801: (r = sshbuf_get_u8(e->request, &type)) != 0)
! 802: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 803:
1.88 markus 804: /* check wheter agent is locked */
805: if (locked && type != SSH_AGENTC_UNLOCK) {
1.194 ! markus 806: sshbuf_reset(e->request);
1.88 markus 807: switch (type) {
808: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
809: case SSH2_AGENTC_REQUEST_IDENTITIES:
810: /* send empty lists */
811: no_identities(e, type);
812: break;
813: default:
814: /* send a fail message for all other request types */
1.194 ! markus 815: send_status(e, 0);
1.88 markus 816: }
817: return;
818: }
819:
1.59 markus 820: debug("type %d", type);
1.21 markus 821: switch (type) {
1.88 markus 822: case SSH_AGENTC_LOCK:
823: case SSH_AGENTC_UNLOCK:
824: process_lock_agent(e, type == SSH_AGENTC_LOCK);
825: break;
1.185 markus 826: #ifdef WITH_SSH1
1.33 markus 827: /* ssh1 */
828: case SSH_AGENTC_RSA_CHALLENGE:
829: process_authentication_challenge1(e);
830: break;
1.21 markus 831: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 832: process_request_identities(e, 1);
1.21 markus 833: break;
834: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 835: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 836: process_add_identity(e, 1);
1.21 markus 837: break;
838: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 839: process_remove_identity(e, 1);
1.21 markus 840: break;
841: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 842: process_remove_all_identities(e, 1);
843: break;
1.185 markus 844: #endif
1.33 markus 845: /* ssh2 */
846: case SSH2_AGENTC_SIGN_REQUEST:
847: process_sign_request2(e);
848: break;
849: case SSH2_AGENTC_REQUEST_IDENTITIES:
850: process_request_identities(e, 2);
851: break;
852: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 853: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 854: process_add_identity(e, 2);
855: break;
856: case SSH2_AGENTC_REMOVE_IDENTITY:
857: process_remove_identity(e, 2);
858: break;
859: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
860: process_remove_all_identities(e, 2);
1.21 markus 861: break;
1.163 markus 862: #ifdef ENABLE_PKCS11
1.59 markus 863: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 864: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 865: process_add_smartcard_key(e);
1.75 deraadt 866: break;
1.59 markus 867: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
868: process_remove_smartcard_key(e);
1.75 deraadt 869: break;
1.163 markus 870: #endif /* ENABLE_PKCS11 */
1.21 markus 871: default:
872: /* Unknown message. Respond with failure. */
873: error("Unknown message %d", type);
1.194 ! markus 874: sshbuf_reset(e->request);
! 875: send_status(e, 0);
1.21 markus 876: break;
877: }
1.1 deraadt 878: }
879:
1.55 itojun 880: static void
1.73 stevesk 881: new_socket(sock_type type, int fd)
1.1 deraadt 882: {
1.112 markus 883: u_int i, old_alloc, new_alloc;
1.96 deraadt 884:
1.119 djm 885: set_nonblock(fd);
1.21 markus 886:
887: if (fd > max_fd)
888: max_fd = fd;
889:
890: for (i = 0; i < sockets_alloc; i++)
891: if (sockets[i].type == AUTH_UNUSED) {
892: sockets[i].fd = fd;
1.194 ! markus 893: if ((sockets[i].input = sshbuf_new()) == NULL)
! 894: fatal("%s: sshbuf_new failed", __func__);
! 895: if ((sockets[i].output = sshbuf_new()) == NULL)
! 896: fatal("%s: sshbuf_new failed", __func__);
! 897: if ((sockets[i].request = sshbuf_new()) == NULL)
! 898: fatal("%s: sshbuf_new failed", __func__);
1.112 markus 899: sockets[i].type = type;
1.21 markus 900: return;
901: }
902: old_alloc = sockets_alloc;
1.112 markus 903: new_alloc = sockets_alloc + 10;
1.133 djm 904: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 905: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 906: sockets[i].type = AUTH_UNUSED;
1.112 markus 907: sockets_alloc = new_alloc;
1.21 markus 908: sockets[old_alloc].fd = fd;
1.194 ! markus 909: if ((sockets[old_alloc].input = sshbuf_new()) == NULL)
! 910: fatal("%s: sshbuf_new failed", __func__);
! 911: if ((sockets[old_alloc].output = sshbuf_new()) == NULL)
! 912: fatal("%s: sshbuf_new failed", __func__);
! 913: if ((sockets[old_alloc].request = sshbuf_new()) == NULL)
! 914: fatal("%s: sshbuf_new failed", __func__);
1.112 markus 915: sockets[old_alloc].type = type;
1.1 deraadt 916: }
917:
1.55 itojun 918: static int
1.155 dtucker 919: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
920: struct timeval **tvpp)
1.1 deraadt 921: {
1.174 dtucker 922: u_int i, sz;
1.46 markus 923: int n = 0;
1.155 dtucker 924: static struct timeval tv;
1.174 dtucker 925: time_t deadline;
1.46 markus 926:
927: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 928: switch (sockets[i].type) {
929: case AUTH_SOCKET:
930: case AUTH_CONNECTION:
1.46 markus 931: n = MAX(n, sockets[i].fd);
1.21 markus 932: break;
933: case AUTH_UNUSED:
934: break;
935: default:
936: fatal("Unknown socket type %d", sockets[i].type);
937: break;
938: }
1.46 markus 939: }
940:
941: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 942: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 943: free(*fdrp);
944: free(*fdwp);
1.46 markus 945: *fdrp = xmalloc(sz);
946: *fdwp = xmalloc(sz);
1.66 markus 947: *nallocp = sz;
1.46 markus 948: }
1.66 markus 949: if (n < *fdl)
950: debug("XXX shrink: %d < %d", n, *fdl);
951: *fdl = n;
1.46 markus 952: memset(*fdrp, 0, sz);
953: memset(*fdwp, 0, sz);
954:
955: for (i = 0; i < sockets_alloc; i++) {
956: switch (sockets[i].type) {
957: case AUTH_SOCKET:
958: case AUTH_CONNECTION:
959: FD_SET(sockets[i].fd, *fdrp);
1.194 ! markus 960: if (sshbuf_len(sockets[i].output) > 0)
1.46 markus 961: FD_SET(sockets[i].fd, *fdwp);
962: break;
963: default:
964: break;
965: }
966: }
1.155 dtucker 967: deadline = reaper();
968: if (parent_alive_interval != 0)
969: deadline = (deadline == 0) ? parent_alive_interval :
970: MIN(deadline, parent_alive_interval);
971: if (deadline == 0) {
972: *tvpp = NULL;
973: } else {
974: tv.tv_sec = deadline;
975: tv.tv_usec = 0;
976: *tvpp = &tv;
977: }
1.46 markus 978: return (1);
1.21 markus 979: }
980:
1.55 itojun 981: static void
1.21 markus 982: after_select(fd_set *readset, fd_set *writeset)
983: {
1.96 deraadt 984: struct sockaddr_un sunaddr;
1.26 markus 985: socklen_t slen;
1.21 markus 986: char buf[1024];
1.194 ! markus 987: int len, sock, r;
1.162 djm 988: u_int i, orig_alloc;
1.103 markus 989: uid_t euid;
990: gid_t egid;
1.21 markus 991:
1.162 djm 992: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 993: switch (sockets[i].type) {
994: case AUTH_UNUSED:
995: break;
996: case AUTH_SOCKET:
997: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 998: slen = sizeof(sunaddr);
1.46 markus 999: sock = accept(sockets[i].fd,
1.131 deraadt 1000: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 1001: if (sock < 0) {
1.81 stevesk 1002: error("accept from AUTH_SOCKET: %s",
1003: strerror(errno));
1.103 markus 1004: break;
1005: }
1006: if (getpeereid(sock, &euid, &egid) < 0) {
1007: error("getpeereid %d failed: %s",
1008: sock, strerror(errno));
1009: close(sock);
1010: break;
1011: }
1.105 markus 1012: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 1013: error("uid mismatch: "
1.104 stevesk 1014: "peer euid %u != uid %u",
1015: (u_int) euid, (u_int) getuid());
1.103 markus 1016: close(sock);
1.21 markus 1017: break;
1018: }
1019: new_socket(AUTH_CONNECTION, sock);
1020: }
1021: break;
1022: case AUTH_CONNECTION:
1.194 ! markus 1023: if (sshbuf_len(sockets[i].output) > 0 &&
1.21 markus 1024: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 1025: len = write(sockets[i].fd,
1.194 ! markus 1026: sshbuf_ptr(sockets[i].output),
! 1027: sshbuf_len(sockets[i].output));
1.162 djm 1028: if (len == -1 && (errno == EAGAIN ||
1029: errno == EINTR))
1030: continue;
1.21 markus 1031: if (len <= 0) {
1.101 stevesk 1032: close_socket(&sockets[i]);
1.21 markus 1033: break;
1034: }
1.194 ! markus 1035: if ((r = sshbuf_consume(sockets[i].output,
! 1036: len)) != 0)
! 1037: fatal("%s: buffer error: %s",
! 1038: __func__, ssh_err(r));
1.21 markus 1039: }
1040: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 1041: len = read(sockets[i].fd, buf, sizeof(buf));
1042: if (len == -1 && (errno == EAGAIN ||
1043: errno == EINTR))
1044: continue;
1.21 markus 1045: if (len <= 0) {
1.101 stevesk 1046: close_socket(&sockets[i]);
1.21 markus 1047: break;
1048: }
1.194 ! markus 1049: if ((r = sshbuf_put(sockets[i].input,
! 1050: buf, len)) != 0)
! 1051: fatal("%s: buffer error: %s",
! 1052: __func__, ssh_err(r));
1.190 dtucker 1053: explicit_bzero(buf, sizeof(buf));
1.21 markus 1054: process_message(&sockets[i]);
1055: }
1056: break;
1057: default:
1058: fatal("Unknown type %d", sockets[i].type);
1059: }
1.1 deraadt 1060: }
1061:
1.55 itojun 1062: static void
1.113 markus 1063: cleanup_socket(void)
1.15 markus 1064: {
1.187 djm 1065: if (cleanup_pid != 0 && getpid() != cleanup_pid)
1066: return;
1067: debug("%s: cleanup", __func__);
1.48 deraadt 1068: if (socket_name[0])
1069: unlink(socket_name);
1070: if (socket_dir[0])
1071: rmdir(socket_dir);
1.10 markus 1072: }
1073:
1.114 markus 1074: void
1.15 markus 1075: cleanup_exit(int i)
1076: {
1.113 markus 1077: cleanup_socket();
1078: _exit(i);
1.15 markus 1079: }
1080:
1.135 deraadt 1081: /*ARGSUSED*/
1.55 itojun 1082: static void
1.48 deraadt 1083: cleanup_handler(int sig)
1084: {
1.113 markus 1085: cleanup_socket();
1.163 markus 1086: #ifdef ENABLE_PKCS11
1087: pkcs11_terminate();
1088: #endif
1.48 deraadt 1089: _exit(2);
1.113 markus 1090: }
1091:
1.68 markus 1092: static void
1.155 dtucker 1093: check_parent_exists(void)
1.68 markus 1094: {
1.172 dtucker 1095: /*
1096: * If our parent has exited then getppid() will return (pid_t)1,
1097: * so testing for that should be safe.
1098: */
1099: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1100: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1101: cleanup_socket();
1102: _exit(2);
1.68 markus 1103: }
1.48 deraadt 1104: }
1105:
1.55 itojun 1106: static void
1.50 itojun 1107: usage(void)
1.15 markus 1108: {
1.184 deraadt 1109: fprintf(stderr,
1.193 jmc 1110: "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-E fingerprint_hash]\n"
1111: " [-t life] [command [arg ...]]\n"
1.184 deraadt 1112: " ssh-agent [-c | -s] -k\n");
1.21 markus 1113: exit(1);
1.15 markus 1114: }
1115:
1.2 provos 1116: int
1117: main(int ac, char **av)
1.1 deraadt 1118: {
1.107 markus 1119: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1120: int sock, fd, ch, result, saved_errno;
1.120 avsm 1121: u_int nalloc;
1.96 deraadt 1122: char *shell, *format, *pidstr, *agentsocket = NULL;
1123: fd_set *readsetp = NULL, *writesetp = NULL;
1.41 markus 1124: struct rlimit rlim;
1.96 deraadt 1125: extern int optind;
1.98 stevesk 1126: extern char *optarg;
1.21 markus 1127: pid_t pid;
1.96 deraadt 1128: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1129: struct timeval *tvp = NULL;
1.161 tobias 1130: size_t len;
1.189 djm 1131: mode_t prev_mask;
1.123 djm 1132:
1133: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1134: sanitise_stdfd();
1.99 markus 1135:
1136: /* drop */
1137: setegid(getgid());
1138: setgid(getgid());
1.53 markus 1139:
1.185 markus 1140: #ifdef WITH_OPENSSL
1.170 djm 1141: OpenSSL_add_all_algorithms();
1.185 markus 1142: #endif
1.21 markus 1143:
1.192 djm 1144: while ((ch = getopt(ac, av, "cdksE:a:t:")) != -1) {
1.21 markus 1145: switch (ch) {
1.192 djm 1146: case 'E':
1147: fingerprint_hash = ssh_digest_alg_by_name(optarg);
1148: if (fingerprint_hash == -1)
1149: fatal("Invalid hash algorithm \"%s\"", optarg);
1150: break;
1.21 markus 1151: case 'c':
1152: if (s_flag)
1153: usage();
1154: c_flag++;
1155: break;
1156: case 'k':
1157: k_flag++;
1158: break;
1159: case 's':
1160: if (c_flag)
1161: usage();
1162: s_flag++;
1163: break;
1.57 markus 1164: case 'd':
1165: if (d_flag)
1166: usage();
1167: d_flag++;
1168: break;
1.86 markus 1169: case 'a':
1170: agentsocket = optarg;
1.106 marc 1171: break;
1172: case 't':
1173: if ((lifetime = convtime(optarg)) == -1) {
1174: fprintf(stderr, "Invalid lifetime\n");
1175: usage();
1176: }
1.86 markus 1177: break;
1.21 markus 1178: default:
1179: usage();
1180: }
1181: }
1182: ac -= optind;
1183: av += optind;
1184:
1.57 markus 1185: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1186: usage();
1187:
1.85 markus 1188: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1189: shell = getenv("SHELL");
1.161 tobias 1190: if (shell != NULL && (len = strlen(shell)) > 2 &&
1191: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1192: c_flag = 1;
1193: }
1194: if (k_flag) {
1.136 deraadt 1195: const char *errstr = NULL;
1196:
1.21 markus 1197: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1198: if (pidstr == NULL) {
1199: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1200: SSH_AGENTPID_ENV_NAME);
1.21 markus 1201: exit(1);
1202: }
1.136 deraadt 1203: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1204: if (errstr) {
1205: fprintf(stderr,
1206: "%s=\"%s\", which is not a good PID: %s\n",
1207: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1208: exit(1);
1209: }
1210: if (kill(pid, SIGTERM) == -1) {
1211: perror("kill");
1212: exit(1);
1213: }
1214: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1215: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1216: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1217: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1218: exit(0);
1219: }
1220: parent_pid = getpid();
1221:
1.86 markus 1222: if (agentsocket == NULL) {
1223: /* Create private directory for agent socket */
1.171 djm 1224: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1225: if (mkdtemp(socket_dir) == NULL) {
1226: perror("mkdtemp: private socket dir");
1227: exit(1);
1228: }
1.91 mpech 1229: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1230: (long)parent_pid);
1.86 markus 1231: } else {
1232: /* Try to use specified agent socket */
1233: socket_dir[0] = '\0';
1234: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1235: }
1236:
1.23 markus 1237: /*
1238: * Create socket early so it will exist before command gets run from
1239: * the parent.
1240: */
1.189 djm 1241: prev_mask = umask(0177);
1.188 millert 1242: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 1243: if (sock < 0) {
1.188 millert 1244: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 1245: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1246: cleanup_exit(1);
1247: }
1.189 djm 1248: umask(prev_mask);
1.46 markus 1249:
1.23 markus 1250: /*
1251: * Fork, and have the parent execute the command, if any, or present
1252: * the socket data. The child continues as the authentication agent.
1253: */
1.57 markus 1254: if (d_flag) {
1255: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1256: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1257: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1258: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1259: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1260: goto skip;
1261: }
1.21 markus 1262: pid = fork();
1263: if (pid == -1) {
1264: perror("fork");
1.81 stevesk 1265: cleanup_exit(1);
1.21 markus 1266: }
1267: if (pid != 0) { /* Parent - execute the given command. */
1268: close(sock);
1.91 mpech 1269: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1270: if (ac == 0) {
1271: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1272: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1273: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1274: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1275: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1276: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1277: exit(0);
1278: }
1.36 deraadt 1279: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1280: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1281: perror("setenv");
1282: exit(1);
1283: }
1.21 markus 1284: execvp(av[0], av);
1285: perror(av[0]);
1286: exit(1);
1287: }
1.81 stevesk 1288: /* child */
1289: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1290:
1291: if (setsid() == -1) {
1.81 stevesk 1292: error("setsid: %s", strerror(errno));
1.67 stevesk 1293: cleanup_exit(1);
1294: }
1295:
1296: (void)chdir("/");
1.107 markus 1297: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1298: /* XXX might close listen socket */
1299: (void)dup2(fd, STDIN_FILENO);
1300: (void)dup2(fd, STDOUT_FILENO);
1301: (void)dup2(fd, STDERR_FILENO);
1302: if (fd > 2)
1303: close(fd);
1304: }
1.21 markus 1305:
1.41 markus 1306: /* deny core dumps, since memory contains unencrypted private keys */
1307: rlim.rlim_cur = rlim.rlim_max = 0;
1308: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1309: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1310: cleanup_exit(1);
1311: }
1.57 markus 1312:
1313: skip:
1.187 djm 1314:
1315: cleanup_pid = getpid();
1.163 markus 1316:
1317: #ifdef ENABLE_PKCS11
1318: pkcs11_init(0);
1319: #endif
1.21 markus 1320: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1321: if (ac > 0)
1322: parent_alive_interval = 10;
1.33 markus 1323: idtab_init();
1.61 markus 1324: signal(SIGPIPE, SIG_IGN);
1.177 djm 1325: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1326: signal(SIGHUP, cleanup_handler);
1327: signal(SIGTERM, cleanup_handler);
1.66 markus 1328: nalloc = 0;
1329:
1.21 markus 1330: while (1) {
1.155 dtucker 1331: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1332: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1333: saved_errno = errno;
1.155 dtucker 1334: if (parent_alive_interval != 0)
1335: check_parent_exists();
1336: (void) reaper(); /* remove expired keys */
1.154 dtucker 1337: if (result < 0) {
1338: if (saved_errno == EINTR)
1.21 markus 1339: continue;
1.154 dtucker 1340: fatal("select: %s", strerror(saved_errno));
1341: } else if (result > 0)
1342: after_select(readsetp, writesetp);
1.15 markus 1343: }
1.21 markus 1344: /* NOTREACHED */
1.1 deraadt 1345: }
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