Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.173
1.173 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.172 2011/06/03 01:37:40 dtucker 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);
1.173 ! djm 161: free(id->provider);
! 162: free(id->comment);
! 163: free(id);
1.89 markus 164: }
165:
1.33 markus 166: /* return matching private key for given public key */
1.78 provos 167: static Identity *
168: lookup_identity(Key *key, int version)
1.33 markus 169: {
1.78 provos 170: Identity *id;
171:
1.33 markus 172: Idtab *tab = idtab_lookup(version);
1.78 provos 173: TAILQ_FOREACH(id, &tab->idlist, next) {
174: if (key_equal(key, id->key))
175: return (id);
1.33 markus 176: }
1.78 provos 177: return (NULL);
178: }
179:
1.107 markus 180: /* Check confirmation of keysign request */
181: static int
182: confirm_key(Identity *id)
183: {
1.122 djm 184: char *p;
1.107 markus 185: int ret = -1;
186:
187: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 188: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
189: id->comment, p))
190: ret = 0;
1.173 ! djm 191: free(p);
1.122 djm 192:
1.107 markus 193: return (ret);
194: }
195:
1.33 markus 196: /* send list of supported public keys to 'client' */
1.55 itojun 197: static void
1.33 markus 198: process_request_identities(SocketEntry *e, int version)
199: {
200: Idtab *tab = idtab_lookup(version);
1.96 deraadt 201: Identity *id;
1.21 markus 202: Buffer msg;
1.1 deraadt 203:
1.21 markus 204: buffer_init(&msg);
1.33 markus 205: buffer_put_char(&msg, (version == 1) ?
206: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
207: buffer_put_int(&msg, tab->nentries);
1.78 provos 208: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 209: if (id->key->type == KEY_RSA1) {
1.33 markus 210: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
211: buffer_put_bignum(&msg, id->key->rsa->e);
212: buffer_put_bignum(&msg, id->key->rsa->n);
213: } else {
1.45 markus 214: u_char *blob;
215: u_int blen;
1.39 markus 216: key_to_blob(id->key, &blob, &blen);
1.33 markus 217: buffer_put_string(&msg, blob, blen);
1.173 ! djm 218: free(blob);
1.33 markus 219: }
220: buffer_put_cstring(&msg, id->comment);
1.21 markus 221: }
222: buffer_put_int(&e->output, buffer_len(&msg));
223: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
224: buffer_free(&msg);
1.1 deraadt 225: }
226:
1.33 markus 227: /* ssh1 only */
1.55 itojun 228: static void
1.33 markus 229: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 230: {
1.96 deraadt 231: u_char buf[32], mdbuf[16], session_id[16];
232: u_int response_type;
233: BIGNUM *challenge;
1.78 provos 234: Identity *id;
1.33 markus 235: int i, len;
1.21 markus 236: Buffer msg;
237: MD5_CTX md;
1.96 deraadt 238: Key *key;
1.21 markus 239:
240: buffer_init(&msg);
1.39 markus 241: key = key_new(KEY_RSA1);
1.76 markus 242: if ((challenge = BN_new()) == NULL)
243: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 244:
1.97 markus 245: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 246: buffer_get_bignum(&e->request, key->rsa->e);
247: buffer_get_bignum(&e->request, key->rsa->n);
248: buffer_get_bignum(&e->request, challenge);
1.21 markus 249:
1.33 markus 250: /* Only protocol 1.1 is supported */
1.87 markus 251: if (buffer_len(&e->request) == 0)
1.33 markus 252: goto failure;
1.87 markus 253: buffer_get(&e->request, session_id, 16);
254: response_type = buffer_get_int(&e->request);
1.33 markus 255: if (response_type != 1)
256: goto failure;
257:
1.78 provos 258: id = lookup_identity(key, 1);
1.107 markus 259: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 260: Key *private = id->key;
1.33 markus 261: /* Decrypt the challenge using the private key. */
1.49 markus 262: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
263: goto failure;
1.33 markus 264:
265: /* The response is MD5 of decrypted challenge plus session id. */
266: len = BN_num_bytes(challenge);
267: if (len <= 0 || len > 32) {
1.109 itojun 268: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 269: goto failure;
270: }
271: memset(buf, 0, 32);
272: BN_bn2bin(challenge, buf + 32 - len);
273: MD5_Init(&md);
274: MD5_Update(&md, buf, 32);
275: MD5_Update(&md, session_id, 16);
276: MD5_Final(mdbuf, &md);
277:
278: /* Send the response. */
279: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
280: for (i = 0; i < 16; i++)
281: buffer_put_char(&msg, mdbuf[i]);
282: goto send;
283: }
1.21 markus 284:
1.33 markus 285: failure:
286: /* Unknown identity or protocol error. Send failure. */
1.21 markus 287: buffer_put_char(&msg, SSH_AGENT_FAILURE);
288: send:
289: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 290: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
291: key_free(key);
292: BN_clear_free(challenge);
293: buffer_free(&msg);
294: }
295:
296: /* ssh2 only */
1.55 itojun 297: static void
1.33 markus 298: process_sign_request2(SocketEntry *e)
299: {
1.45 markus 300: u_char *blob, *data, *signature = NULL;
301: u_int blen, dlen, slen = 0;
1.96 deraadt 302: extern int datafellows;
1.159 djm 303: int odatafellows;
1.96 deraadt 304: int ok = -1, flags;
1.33 markus 305: Buffer msg;
1.96 deraadt 306: Key *key;
1.33 markus 307:
308: datafellows = 0;
1.43 markus 309:
1.87 markus 310: blob = buffer_get_string(&e->request, &blen);
311: data = buffer_get_string(&e->request, &dlen);
1.37 markus 312:
1.87 markus 313: flags = buffer_get_int(&e->request);
1.159 djm 314: odatafellows = datafellows;
1.37 markus 315: if (flags & SSH_AGENT_OLD_SIGNATURE)
316: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 317:
1.39 markus 318: key = key_from_blob(blob, blen);
1.33 markus 319: if (key != NULL) {
1.78 provos 320: Identity *id = lookup_identity(key, 2);
1.107 markus 321: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 322: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 323: key_free(key);
1.33 markus 324: }
325: buffer_init(&msg);
326: if (ok == 0) {
327: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
328: buffer_put_string(&msg, signature, slen);
329: } else {
330: buffer_put_char(&msg, SSH_AGENT_FAILURE);
331: }
332: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 333: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 334: buffer_len(&msg));
1.21 markus 335: buffer_free(&msg);
1.173 ! djm 336: free(data);
! 337: free(blob);
! 338: free(signature);
1.159 djm 339: datafellows = odatafellows;
1.1 deraadt 340: }
341:
1.33 markus 342: /* shared */
1.55 itojun 343: static void
1.33 markus 344: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 345: {
1.96 deraadt 346: u_int blen, bits;
347: int success = 0;
1.78 provos 348: Key *key = NULL;
1.45 markus 349: u_char *blob;
1.21 markus 350:
1.74 deraadt 351: switch (version) {
1.33 markus 352: case 1:
1.39 markus 353: key = key_new(KEY_RSA1);
1.87 markus 354: bits = buffer_get_int(&e->request);
355: buffer_get_bignum(&e->request, key->rsa->e);
356: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 357:
358: if (bits != key_size(key))
1.109 itojun 359: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 360: key_size(key), bits);
1.33 markus 361: break;
362: case 2:
1.87 markus 363: blob = buffer_get_string(&e->request, &blen);
1.39 markus 364: key = key_from_blob(blob, blen);
1.173 ! djm 365: free(blob);
1.33 markus 366: break;
367: }
368: if (key != NULL) {
1.78 provos 369: Identity *id = lookup_identity(key, version);
370: if (id != NULL) {
1.23 markus 371: /*
372: * We have this key. Free the old key. Since we
1.124 djm 373: * don't want to leave empty slots in the middle of
1.40 markus 374: * the array, we actually free the key there and move
375: * all the entries between the empty slot and the end
376: * of the array.
1.23 markus 377: */
1.33 markus 378: Idtab *tab = idtab_lookup(version);
1.38 markus 379: if (tab->nentries < 1)
380: fatal("process_remove_identity: "
381: "internal error: tab->nentries %d",
382: tab->nentries);
1.78 provos 383: TAILQ_REMOVE(&tab->idlist, id, next);
384: free_identity(id);
1.33 markus 385: tab->nentries--;
386: success = 1;
1.21 markus 387: }
1.33 markus 388: key_free(key);
389: }
1.1 deraadt 390: buffer_put_int(&e->output, 1);
1.33 markus 391: buffer_put_char(&e->output,
392: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 393: }
394:
1.55 itojun 395: static void
1.33 markus 396: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 397: {
1.33 markus 398: Idtab *tab = idtab_lookup(version);
1.78 provos 399: Identity *id;
1.21 markus 400:
401: /* Loop over all identities and clear the keys. */
1.78 provos 402: for (id = TAILQ_FIRST(&tab->idlist); id;
403: id = TAILQ_FIRST(&tab->idlist)) {
404: TAILQ_REMOVE(&tab->idlist, id, next);
405: free_identity(id);
1.21 markus 406: }
407:
408: /* Mark that there are no identities. */
1.33 markus 409: tab->nentries = 0;
1.21 markus 410:
411: /* Send success. */
412: buffer_put_int(&e->output, 1);
413: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 414: }
415:
1.155 dtucker 416: /* removes expired keys and returns number of seconds until the next expiry */
417: static u_int
1.89 markus 418: reaper(void)
419: {
1.155 dtucker 420: u_int deadline = 0, now = time(NULL);
1.89 markus 421: Identity *id, *nxt;
422: int version;
1.96 deraadt 423: Idtab *tab;
1.89 markus 424:
425: for (version = 1; version < 3; version++) {
426: tab = idtab_lookup(version);
427: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
428: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 429: if (id->death == 0)
430: continue;
431: if (now >= id->death) {
1.154 dtucker 432: debug("expiring key '%s'", id->comment);
1.89 markus 433: TAILQ_REMOVE(&tab->idlist, id, next);
434: free_identity(id);
435: tab->nentries--;
1.155 dtucker 436: } else
437: deadline = (deadline == 0) ? id->death :
438: MIN(deadline, id->death);
1.89 markus 439: }
440: }
1.155 dtucker 441: if (deadline == 0 || deadline <= now)
442: return 0;
443: else
444: return (deadline - now);
1.89 markus 445: }
446:
447: static void
1.33 markus 448: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 449: {
1.96 deraadt 450: Idtab *tab = idtab_lookup(version);
1.157 canacar 451: Identity *id;
1.107 markus 452: int type, success = 0, death = 0, confirm = 0;
1.169 djm 453: char *type_name, *comment, *curve;
1.33 markus 454: Key *k = NULL;
1.169 djm 455: BIGNUM *exponent;
456: EC_POINT *q;
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);
1.74 deraadt 479: switch (type) {
1.39 markus 480: case KEY_DSA:
481: k = key_new_private(type);
1.87 markus 482: buffer_get_bignum2(&e->request, k->dsa->p);
483: buffer_get_bignum2(&e->request, k->dsa->q);
484: buffer_get_bignum2(&e->request, k->dsa->g);
485: buffer_get_bignum2(&e->request, k->dsa->pub_key);
486: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 487: break;
1.166 djm 488: case KEY_DSA_CERT_V00:
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");
1.173 ! djm 493: free(cert);
1.165 djm 494: key_add_private(k);
495: buffer_get_bignum2(&e->request, k->dsa->priv_key);
496: break;
1.169 djm 497: case KEY_ECDSA:
498: k = key_new_private(type);
499: k->ecdsa_nid = key_ecdsa_nid_from_name(type_name);
500: curve = buffer_get_string(&e->request, NULL);
501: if (k->ecdsa_nid != key_curve_name_to_nid(curve))
502: fatal("%s: curve names mismatch", __func__);
1.173 ! djm 503: free(curve);
1.169 djm 504: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
505: if (k->ecdsa == NULL)
506: fatal("%s: EC_KEY_new_by_curve_name failed",
507: __func__);
508: q = EC_POINT_new(EC_KEY_get0_group(k->ecdsa));
509: if (q == NULL)
510: fatal("%s: BN_new failed", __func__);
511: if ((exponent = BN_new()) == NULL)
512: fatal("%s: BN_new failed", __func__);
513: buffer_get_ecpoint(&e->request,
514: EC_KEY_get0_group(k->ecdsa), q);
515: buffer_get_bignum2(&e->request, exponent);
516: if (EC_KEY_set_public_key(k->ecdsa, q) != 1)
517: fatal("%s: EC_KEY_set_public_key failed",
518: __func__);
519: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
520: fatal("%s: EC_KEY_set_private_key failed",
521: __func__);
522: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
523: EC_KEY_get0_public_key(k->ecdsa)) != 0)
524: fatal("%s: bad ECDSA public key", __func__);
525: if (key_ec_validate_private(k->ecdsa) != 0)
526: fatal("%s: bad ECDSA private key", __func__);
527: BN_clear_free(exponent);
528: EC_POINT_free(q);
529: break;
530: case KEY_ECDSA_CERT:
531: cert = buffer_get_string(&e->request, &len);
532: if ((k = key_from_blob(cert, len)) == NULL)
533: fatal("Certificate parse failed");
1.173 ! djm 534: free(cert);
1.169 djm 535: key_add_private(k);
536: if ((exponent = BN_new()) == NULL)
537: fatal("%s: BN_new failed", __func__);
538: buffer_get_bignum2(&e->request, exponent);
539: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
540: fatal("%s: EC_KEY_set_private_key failed",
541: __func__);
542: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
543: EC_KEY_get0_public_key(k->ecdsa)) != 0 ||
544: key_ec_validate_private(k->ecdsa) != 0)
545: fatal("%s: bad ECDSA key", __func__);
546: BN_clear_free(exponent);
547: break;
1.39 markus 548: case KEY_RSA:
549: k = key_new_private(type);
1.87 markus 550: buffer_get_bignum2(&e->request, k->rsa->n);
551: buffer_get_bignum2(&e->request, k->rsa->e);
552: buffer_get_bignum2(&e->request, k->rsa->d);
553: buffer_get_bignum2(&e->request, k->rsa->iqmp);
554: buffer_get_bignum2(&e->request, k->rsa->p);
555: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 556:
557: /* Generate additional parameters */
1.60 markus 558: rsa_generate_additional_parameters(k->rsa);
1.39 markus 559: break;
1.166 djm 560: case KEY_RSA_CERT_V00:
1.165 djm 561: case KEY_RSA_CERT:
562: cert = buffer_get_string(&e->request, &len);
563: if ((k = key_from_blob(cert, len)) == NULL)
564: fatal("Certificate parse failed");
1.173 ! djm 565: free(cert);
1.165 djm 566: key_add_private(k);
567: buffer_get_bignum2(&e->request, k->rsa->d);
568: buffer_get_bignum2(&e->request, k->rsa->iqmp);
569: buffer_get_bignum2(&e->request, k->rsa->p);
570: buffer_get_bignum2(&e->request, k->rsa->q);
571: break;
1.39 markus 572: default:
1.173 ! djm 573: free(type_name);
1.87 markus 574: buffer_clear(&e->request);
1.108 markus 575: goto send;
576: }
1.173 ! djm 577: free(type_name);
1.108 markus 578: break;
579: }
580: /* enable blinding */
581: switch (k->type) {
582: case KEY_RSA:
1.166 djm 583: case KEY_RSA_CERT_V00:
1.165 djm 584: case KEY_RSA_CERT:
1.108 markus 585: case KEY_RSA1:
586: if (RSA_blinding_on(k->rsa, NULL) != 1) {
587: error("process_add_identity: RSA_blinding_on failed");
588: key_free(k);
1.33 markus 589: goto send;
1.21 markus 590: }
1.33 markus 591: break;
592: }
1.87 markus 593: comment = buffer_get_string(&e->request, NULL);
1.33 markus 594: if (k == NULL) {
1.173 ! djm 595: free(comment);
1.33 markus 596: goto send;
597: }
1.94 markus 598: while (buffer_len(&e->request)) {
1.158 djm 599: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 600: case SSH_AGENT_CONSTRAIN_LIFETIME:
601: death = time(NULL) + buffer_get_int(&e->request);
602: break;
1.107 markus 603: case SSH_AGENT_CONSTRAIN_CONFIRM:
604: confirm = 1;
605: break;
1.94 markus 606: default:
1.158 djm 607: error("process_add_identity: "
608: "Unknown constraint type %d", type);
1.173 ! djm 609: free(comment);
1.158 djm 610: key_free(k);
611: goto send;
1.94 markus 612: }
613: }
1.158 djm 614: success = 1;
1.106 marc 615: if (lifetime && !death)
616: death = time(NULL) + lifetime;
1.157 canacar 617: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 618: id = xcalloc(1, sizeof(Identity));
1.78 provos 619: id->key = k;
620: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 621: /* Increment the number of identities. */
622: tab->nentries++;
623: } else {
624: key_free(k);
1.173 ! djm 625: free(id->comment);
1.33 markus 626: }
1.157 canacar 627: id->comment = comment;
628: id->death = death;
629: id->confirm = confirm;
1.33 markus 630: send:
1.1 deraadt 631: buffer_put_int(&e->output, 1);
1.33 markus 632: buffer_put_char(&e->output,
633: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 634: }
635:
1.88 markus 636: /* XXX todo: encrypt sensitive data with passphrase */
637: static void
638: process_lock_agent(SocketEntry *e, int lock)
639: {
1.96 deraadt 640: int success = 0;
1.88 markus 641: char *passwd;
642:
643: passwd = buffer_get_string(&e->request, NULL);
644: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
645: locked = 0;
646: memset(lock_passwd, 0, strlen(lock_passwd));
1.173 ! djm 647: free(lock_passwd);
1.88 markus 648: lock_passwd = NULL;
649: success = 1;
650: } else if (!locked && lock) {
651: locked = 1;
652: lock_passwd = xstrdup(passwd);
653: success = 1;
654: }
655: memset(passwd, 0, strlen(passwd));
1.173 ! djm 656: free(passwd);
1.95 deraadt 657:
1.88 markus 658: buffer_put_int(&e->output, 1);
659: buffer_put_char(&e->output,
660: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
661: }
662:
663: static void
664: no_identities(SocketEntry *e, u_int type)
665: {
666: Buffer msg;
667:
668: buffer_init(&msg);
669: buffer_put_char(&msg,
670: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
671: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
672: buffer_put_int(&msg, 0);
673: buffer_put_int(&e->output, buffer_len(&msg));
674: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
675: buffer_free(&msg);
676: }
1.59 markus 677:
1.163 markus 678: #ifdef ENABLE_PKCS11
1.59 markus 679: static void
1.158 djm 680: process_add_smartcard_key(SocketEntry *e)
1.59 markus 681: {
1.163 markus 682: char *provider = NULL, *pin;
683: int i, type, version, count = 0, success = 0, death = 0, confirm = 0;
684: Key **keys = NULL, *k;
1.84 markus 685: Identity *id;
1.59 markus 686: Idtab *tab;
1.75 deraadt 687:
1.163 markus 688: provider = buffer_get_string(&e->request, NULL);
1.87 markus 689: pin = buffer_get_string(&e->request, NULL);
1.110 djm 690:
691: while (buffer_len(&e->request)) {
1.158 djm 692: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 693: case SSH_AGENT_CONSTRAIN_LIFETIME:
694: death = time(NULL) + buffer_get_int(&e->request);
695: break;
696: case SSH_AGENT_CONSTRAIN_CONFIRM:
697: confirm = 1;
698: break;
699: default:
1.158 djm 700: error("process_add_smartcard_key: "
701: "Unknown constraint type %d", type);
702: goto send;
1.110 djm 703: }
704: }
705: if (lifetime && !death)
706: death = time(NULL) + lifetime;
707:
1.163 markus 708: count = pkcs11_add_provider(provider, pin, &keys);
709: for (i = 0; i < count; i++) {
1.84 markus 710: k = keys[i];
711: version = k->type == KEY_RSA1 ? 1 : 2;
712: tab = idtab_lookup(version);
713: if (lookup_identity(k, version) == NULL) {
1.163 markus 714: id = xcalloc(1, sizeof(Identity));
1.84 markus 715: id->key = k;
1.163 markus 716: id->provider = xstrdup(provider);
717: id->comment = xstrdup(provider); /* XXX */
1.110 djm 718: id->death = death;
719: id->confirm = confirm;
1.84 markus 720: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
721: tab->nentries++;
722: success = 1;
723: } else {
724: key_free(k);
725: }
726: keys[i] = NULL;
1.59 markus 727: }
728: send:
1.173 ! djm 729: free(pin);
! 730: free(provider);
! 731: free(keys);
1.59 markus 732: buffer_put_int(&e->output, 1);
733: buffer_put_char(&e->output,
734: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
735: }
736:
737: static void
738: process_remove_smartcard_key(SocketEntry *e)
739: {
1.163 markus 740: char *provider = NULL, *pin = NULL;
741: int version, success = 0;
742: Identity *id, *nxt;
1.84 markus 743: Idtab *tab;
1.59 markus 744:
1.163 markus 745: provider = buffer_get_string(&e->request, NULL);
1.87 markus 746: pin = buffer_get_string(&e->request, NULL);
1.173 ! djm 747: free(pin);
1.59 markus 748:
1.163 markus 749: for (version = 1; version < 3; version++) {
750: tab = idtab_lookup(version);
751: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
752: nxt = TAILQ_NEXT(id, next);
753: if (!strcmp(provider, id->provider)) {
754: TAILQ_REMOVE(&tab->idlist, id, next);
755: free_identity(id);
756: tab->nentries--;
757: }
1.59 markus 758: }
759: }
1.163 markus 760: if (pkcs11_del_provider(provider) == 0)
761: success = 1;
762: else
763: error("process_remove_smartcard_key:"
764: " pkcs11_del_provider failed");
1.173 ! djm 765: free(provider);
1.59 markus 766: buffer_put_int(&e->output, 1);
767: buffer_put_char(&e->output,
768: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
769: }
1.163 markus 770: #endif /* ENABLE_PKCS11 */
1.59 markus 771:
1.33 markus 772: /* dispatch incoming messages */
773:
1.55 itojun 774: static void
1.2 provos 775: process_message(SocketEntry *e)
1.1 deraadt 776: {
1.96 deraadt 777: u_int msg_len, type;
1.45 markus 778: u_char *cp;
1.89 markus 779:
1.21 markus 780: if (buffer_len(&e->input) < 5)
781: return; /* Incomplete message. */
1.77 stevesk 782: cp = buffer_ptr(&e->input);
1.137 djm 783: msg_len = get_u32(cp);
1.21 markus 784: if (msg_len > 256 * 1024) {
1.101 stevesk 785: close_socket(e);
1.21 markus 786: return;
787: }
788: if (buffer_len(&e->input) < msg_len + 4)
789: return;
1.87 markus 790:
791: /* move the current input to e->request */
1.21 markus 792: buffer_consume(&e->input, 4);
1.87 markus 793: buffer_clear(&e->request);
794: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
795: buffer_consume(&e->input, msg_len);
796: type = buffer_get_char(&e->request);
1.21 markus 797:
1.88 markus 798: /* check wheter agent is locked */
799: if (locked && type != SSH_AGENTC_UNLOCK) {
800: buffer_clear(&e->request);
801: switch (type) {
802: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
803: case SSH2_AGENTC_REQUEST_IDENTITIES:
804: /* send empty lists */
805: no_identities(e, type);
806: break;
807: default:
808: /* send a fail message for all other request types */
809: buffer_put_int(&e->output, 1);
810: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
811: }
812: return;
813: }
814:
1.59 markus 815: debug("type %d", type);
1.21 markus 816: switch (type) {
1.88 markus 817: case SSH_AGENTC_LOCK:
818: case SSH_AGENTC_UNLOCK:
819: process_lock_agent(e, type == SSH_AGENTC_LOCK);
820: break;
1.33 markus 821: /* ssh1 */
822: case SSH_AGENTC_RSA_CHALLENGE:
823: process_authentication_challenge1(e);
824: break;
1.21 markus 825: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 826: process_request_identities(e, 1);
1.21 markus 827: break;
828: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 829: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 830: process_add_identity(e, 1);
1.21 markus 831: break;
832: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 833: process_remove_identity(e, 1);
1.21 markus 834: break;
835: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 836: process_remove_all_identities(e, 1);
837: break;
838: /* ssh2 */
839: case SSH2_AGENTC_SIGN_REQUEST:
840: process_sign_request2(e);
841: break;
842: case SSH2_AGENTC_REQUEST_IDENTITIES:
843: process_request_identities(e, 2);
844: break;
845: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 846: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 847: process_add_identity(e, 2);
848: break;
849: case SSH2_AGENTC_REMOVE_IDENTITY:
850: process_remove_identity(e, 2);
851: break;
852: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
853: process_remove_all_identities(e, 2);
1.21 markus 854: break;
1.163 markus 855: #ifdef ENABLE_PKCS11
1.59 markus 856: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 857: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 858: process_add_smartcard_key(e);
1.75 deraadt 859: break;
1.59 markus 860: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
861: process_remove_smartcard_key(e);
1.75 deraadt 862: break;
1.163 markus 863: #endif /* ENABLE_PKCS11 */
1.21 markus 864: default:
865: /* Unknown message. Respond with failure. */
866: error("Unknown message %d", type);
1.87 markus 867: buffer_clear(&e->request);
1.21 markus 868: buffer_put_int(&e->output, 1);
869: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
870: break;
871: }
1.1 deraadt 872: }
873:
1.55 itojun 874: static void
1.73 stevesk 875: new_socket(sock_type type, int fd)
1.1 deraadt 876: {
1.112 markus 877: u_int i, old_alloc, new_alloc;
1.96 deraadt 878:
1.119 djm 879: set_nonblock(fd);
1.21 markus 880:
881: if (fd > max_fd)
882: max_fd = fd;
883:
884: for (i = 0; i < sockets_alloc; i++)
885: if (sockets[i].type == AUTH_UNUSED) {
886: sockets[i].fd = fd;
887: buffer_init(&sockets[i].input);
888: buffer_init(&sockets[i].output);
1.87 markus 889: buffer_init(&sockets[i].request);
1.112 markus 890: sockets[i].type = type;
1.21 markus 891: return;
892: }
893: old_alloc = sockets_alloc;
1.112 markus 894: new_alloc = sockets_alloc + 10;
1.133 djm 895: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 896: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 897: sockets[i].type = AUTH_UNUSED;
1.112 markus 898: sockets_alloc = new_alloc;
1.21 markus 899: sockets[old_alloc].fd = fd;
900: buffer_init(&sockets[old_alloc].input);
901: buffer_init(&sockets[old_alloc].output);
1.87 markus 902: buffer_init(&sockets[old_alloc].request);
1.112 markus 903: sockets[old_alloc].type = type;
1.1 deraadt 904: }
905:
1.55 itojun 906: static int
1.155 dtucker 907: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
908: struct timeval **tvpp)
1.1 deraadt 909: {
1.155 dtucker 910: u_int i, sz, deadline;
1.46 markus 911: int n = 0;
1.155 dtucker 912: static struct timeval tv;
1.46 markus 913:
914: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 915: switch (sockets[i].type) {
916: case AUTH_SOCKET:
917: case AUTH_CONNECTION:
1.46 markus 918: n = MAX(n, sockets[i].fd);
1.21 markus 919: break;
920: case AUTH_UNUSED:
921: break;
922: default:
923: fatal("Unknown socket type %d", sockets[i].type);
924: break;
925: }
1.46 markus 926: }
927:
928: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 929: if (*fdrp == NULL || sz > *nallocp) {
1.173 ! djm 930: free(*fdrp);
! 931: free(*fdwp);
1.46 markus 932: *fdrp = xmalloc(sz);
933: *fdwp = xmalloc(sz);
1.66 markus 934: *nallocp = sz;
1.46 markus 935: }
1.66 markus 936: if (n < *fdl)
937: debug("XXX shrink: %d < %d", n, *fdl);
938: *fdl = n;
1.46 markus 939: memset(*fdrp, 0, sz);
940: memset(*fdwp, 0, sz);
941:
942: for (i = 0; i < sockets_alloc; i++) {
943: switch (sockets[i].type) {
944: case AUTH_SOCKET:
945: case AUTH_CONNECTION:
946: FD_SET(sockets[i].fd, *fdrp);
947: if (buffer_len(&sockets[i].output) > 0)
948: FD_SET(sockets[i].fd, *fdwp);
949: break;
950: default:
951: break;
952: }
953: }
1.155 dtucker 954: deadline = reaper();
955: if (parent_alive_interval != 0)
956: deadline = (deadline == 0) ? parent_alive_interval :
957: MIN(deadline, parent_alive_interval);
958: if (deadline == 0) {
959: *tvpp = NULL;
960: } else {
961: tv.tv_sec = deadline;
962: tv.tv_usec = 0;
963: *tvpp = &tv;
964: }
1.46 markus 965: return (1);
1.21 markus 966: }
967:
1.55 itojun 968: static void
1.21 markus 969: after_select(fd_set *readset, fd_set *writeset)
970: {
1.96 deraadt 971: struct sockaddr_un sunaddr;
1.26 markus 972: socklen_t slen;
1.21 markus 973: char buf[1024];
1.96 deraadt 974: int len, sock;
1.162 djm 975: u_int i, orig_alloc;
1.103 markus 976: uid_t euid;
977: gid_t egid;
1.21 markus 978:
1.162 djm 979: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 980: switch (sockets[i].type) {
981: case AUTH_UNUSED:
982: break;
983: case AUTH_SOCKET:
984: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 985: slen = sizeof(sunaddr);
1.46 markus 986: sock = accept(sockets[i].fd,
1.131 deraadt 987: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 988: if (sock < 0) {
1.81 stevesk 989: error("accept from AUTH_SOCKET: %s",
990: strerror(errno));
1.103 markus 991: break;
992: }
993: if (getpeereid(sock, &euid, &egid) < 0) {
994: error("getpeereid %d failed: %s",
995: sock, strerror(errno));
996: close(sock);
997: break;
998: }
1.105 markus 999: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 1000: error("uid mismatch: "
1.104 stevesk 1001: "peer euid %u != uid %u",
1002: (u_int) euid, (u_int) getuid());
1.103 markus 1003: close(sock);
1.21 markus 1004: break;
1005: }
1006: new_socket(AUTH_CONNECTION, sock);
1007: }
1008: break;
1009: case AUTH_CONNECTION:
1010: if (buffer_len(&sockets[i].output) > 0 &&
1011: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 1012: len = write(sockets[i].fd,
1013: buffer_ptr(&sockets[i].output),
1014: buffer_len(&sockets[i].output));
1015: if (len == -1 && (errno == EAGAIN ||
1016: errno == EINTR))
1017: continue;
1.21 markus 1018: if (len <= 0) {
1.101 stevesk 1019: close_socket(&sockets[i]);
1.21 markus 1020: break;
1021: }
1022: buffer_consume(&sockets[i].output, len);
1023: }
1024: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 1025: len = read(sockets[i].fd, buf, sizeof(buf));
1026: if (len == -1 && (errno == EAGAIN ||
1027: errno == EINTR))
1028: continue;
1.21 markus 1029: if (len <= 0) {
1.101 stevesk 1030: close_socket(&sockets[i]);
1.21 markus 1031: break;
1032: }
1033: buffer_append(&sockets[i].input, buf, len);
1034: process_message(&sockets[i]);
1035: }
1036: break;
1037: default:
1038: fatal("Unknown type %d", sockets[i].type);
1039: }
1.1 deraadt 1040: }
1041:
1.55 itojun 1042: static void
1.113 markus 1043: cleanup_socket(void)
1.15 markus 1044: {
1.48 deraadt 1045: if (socket_name[0])
1046: unlink(socket_name);
1047: if (socket_dir[0])
1048: rmdir(socket_dir);
1.10 markus 1049: }
1050:
1.114 markus 1051: void
1.15 markus 1052: cleanup_exit(int i)
1053: {
1.113 markus 1054: cleanup_socket();
1055: _exit(i);
1.15 markus 1056: }
1057:
1.135 deraadt 1058: /*ARGSUSED*/
1.55 itojun 1059: static void
1.48 deraadt 1060: cleanup_handler(int sig)
1061: {
1.113 markus 1062: cleanup_socket();
1.163 markus 1063: #ifdef ENABLE_PKCS11
1064: pkcs11_terminate();
1065: #endif
1.48 deraadt 1066: _exit(2);
1.113 markus 1067: }
1068:
1.68 markus 1069: static void
1.155 dtucker 1070: check_parent_exists(void)
1.68 markus 1071: {
1.172 dtucker 1072: /*
1073: * If our parent has exited then getppid() will return (pid_t)1,
1074: * so testing for that should be safe.
1075: */
1076: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1077: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1078: cleanup_socket();
1079: _exit(2);
1.68 markus 1080: }
1.48 deraadt 1081: }
1082:
1.55 itojun 1083: static void
1.50 itojun 1084: usage(void)
1.15 markus 1085: {
1.156 sobrado 1086: fprintf(stderr, "usage: %s [options] [command [arg ...]]\n",
1.46 markus 1087: __progname);
1.72 jakob 1088: fprintf(stderr, "Options:\n");
1089: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
1090: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
1091: fprintf(stderr, " -k Kill the current agent.\n");
1092: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 1093: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 1094: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 1095: exit(1);
1.15 markus 1096: }
1097:
1.2 provos 1098: int
1099: main(int ac, char **av)
1.1 deraadt 1100: {
1.107 markus 1101: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1102: int sock, fd, ch, result, saved_errno;
1.120 avsm 1103: u_int nalloc;
1.96 deraadt 1104: char *shell, *format, *pidstr, *agentsocket = NULL;
1105: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1106: struct sockaddr_un sunaddr;
1.41 markus 1107: struct rlimit rlim;
1.96 deraadt 1108: extern int optind;
1.98 stevesk 1109: extern char *optarg;
1.21 markus 1110: pid_t pid;
1.96 deraadt 1111: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1112: struct timeval *tvp = NULL;
1.161 tobias 1113: size_t len;
1.123 djm 1114:
1115: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1116: sanitise_stdfd();
1.99 markus 1117:
1118: /* drop */
1119: setegid(getgid());
1120: setgid(getgid());
1.53 markus 1121:
1.170 djm 1122: OpenSSL_add_all_algorithms();
1.21 markus 1123:
1.106 marc 1124: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1125: switch (ch) {
1126: case 'c':
1127: if (s_flag)
1128: usage();
1129: c_flag++;
1130: break;
1131: case 'k':
1132: k_flag++;
1133: break;
1134: case 's':
1135: if (c_flag)
1136: usage();
1137: s_flag++;
1138: break;
1.57 markus 1139: case 'd':
1140: if (d_flag)
1141: usage();
1142: d_flag++;
1143: break;
1.86 markus 1144: case 'a':
1145: agentsocket = optarg;
1.106 marc 1146: break;
1147: case 't':
1148: if ((lifetime = convtime(optarg)) == -1) {
1149: fprintf(stderr, "Invalid lifetime\n");
1150: usage();
1151: }
1.86 markus 1152: break;
1.21 markus 1153: default:
1154: usage();
1155: }
1156: }
1157: ac -= optind;
1158: av += optind;
1159:
1.57 markus 1160: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1161: usage();
1162:
1.85 markus 1163: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1164: shell = getenv("SHELL");
1.161 tobias 1165: if (shell != NULL && (len = strlen(shell)) > 2 &&
1166: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1167: c_flag = 1;
1168: }
1169: if (k_flag) {
1.136 deraadt 1170: const char *errstr = NULL;
1171:
1.21 markus 1172: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1173: if (pidstr == NULL) {
1174: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1175: SSH_AGENTPID_ENV_NAME);
1.21 markus 1176: exit(1);
1177: }
1.136 deraadt 1178: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1179: if (errstr) {
1180: fprintf(stderr,
1181: "%s=\"%s\", which is not a good PID: %s\n",
1182: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1183: exit(1);
1184: }
1185: if (kill(pid, SIGTERM) == -1) {
1186: perror("kill");
1187: exit(1);
1188: }
1189: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1190: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1191: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1192: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1193: exit(0);
1194: }
1195: parent_pid = getpid();
1196:
1.86 markus 1197: if (agentsocket == NULL) {
1198: /* Create private directory for agent socket */
1.171 djm 1199: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1200: if (mkdtemp(socket_dir) == NULL) {
1201: perror("mkdtemp: private socket dir");
1202: exit(1);
1203: }
1.91 mpech 1204: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1205: (long)parent_pid);
1.86 markus 1206: } else {
1207: /* Try to use specified agent socket */
1208: socket_dir[0] = '\0';
1209: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1210: }
1211:
1.23 markus 1212: /*
1213: * Create socket early so it will exist before command gets run from
1214: * the parent.
1215: */
1.21 markus 1216: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1217: if (sock < 0) {
1218: perror("socket");
1.121 djm 1219: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1220: cleanup_exit(1);
1221: }
1222: memset(&sunaddr, 0, sizeof(sunaddr));
1223: sunaddr.sun_family = AF_UNIX;
1224: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1225: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1226: perror("bind");
1.121 djm 1227: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1228: cleanup_exit(1);
1229: }
1.117 markus 1230: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1231: perror("listen");
1232: cleanup_exit(1);
1233: }
1.46 markus 1234:
1.23 markus 1235: /*
1236: * Fork, and have the parent execute the command, if any, or present
1237: * the socket data. The child continues as the authentication agent.
1238: */
1.57 markus 1239: if (d_flag) {
1240: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1241: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1242: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1243: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1244: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1245: goto skip;
1246: }
1.21 markus 1247: pid = fork();
1248: if (pid == -1) {
1249: perror("fork");
1.81 stevesk 1250: cleanup_exit(1);
1.21 markus 1251: }
1252: if (pid != 0) { /* Parent - execute the given command. */
1253: close(sock);
1.91 mpech 1254: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1255: if (ac == 0) {
1256: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1257: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1258: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1259: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1260: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1261: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1262: exit(0);
1263: }
1.36 deraadt 1264: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1265: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1266: perror("setenv");
1267: exit(1);
1268: }
1.21 markus 1269: execvp(av[0], av);
1270: perror(av[0]);
1271: exit(1);
1272: }
1.81 stevesk 1273: /* child */
1274: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1275:
1276: if (setsid() == -1) {
1.81 stevesk 1277: error("setsid: %s", strerror(errno));
1.67 stevesk 1278: cleanup_exit(1);
1279: }
1280:
1281: (void)chdir("/");
1.107 markus 1282: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1283: /* XXX might close listen socket */
1284: (void)dup2(fd, STDIN_FILENO);
1285: (void)dup2(fd, STDOUT_FILENO);
1286: (void)dup2(fd, STDERR_FILENO);
1287: if (fd > 2)
1288: close(fd);
1289: }
1.21 markus 1290:
1.41 markus 1291: /* deny core dumps, since memory contains unencrypted private keys */
1292: rlim.rlim_cur = rlim.rlim_max = 0;
1293: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1294: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1295: cleanup_exit(1);
1296: }
1.57 markus 1297:
1298: skip:
1.163 markus 1299:
1300: #ifdef ENABLE_PKCS11
1301: pkcs11_init(0);
1302: #endif
1.21 markus 1303: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1304: if (ac > 0)
1305: parent_alive_interval = 10;
1.33 markus 1306: idtab_init();
1.61 markus 1307: if (!d_flag)
1.57 markus 1308: signal(SIGINT, SIG_IGN);
1.61 markus 1309: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1310: signal(SIGHUP, cleanup_handler);
1311: signal(SIGTERM, cleanup_handler);
1.66 markus 1312: nalloc = 0;
1313:
1.21 markus 1314: while (1) {
1.155 dtucker 1315: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1316: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1317: saved_errno = errno;
1.155 dtucker 1318: if (parent_alive_interval != 0)
1319: check_parent_exists();
1320: (void) reaper(); /* remove expired keys */
1.154 dtucker 1321: if (result < 0) {
1322: if (saved_errno == EINTR)
1.21 markus 1323: continue;
1.154 dtucker 1324: fatal("select: %s", strerror(saved_errno));
1325: } else if (result > 0)
1326: after_select(readsetp, writesetp);
1.15 markus 1327: }
1.21 markus 1328: /* NOTREACHED */
1.1 deraadt 1329: }
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