Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.72.2.3
1.1 deraadt 1: /*
1.22 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * The authentication agent program.
1.33 markus 6: *
1.35 deraadt 7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
12: *
1.56 markus 13: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.35 deraadt 14: *
15: * Redistribution and use in source and binary forms, with or without
16: * modification, are permitted provided that the following conditions
17: * are met:
18: * 1. Redistributions of source code must retain the above copyright
19: * notice, this list of conditions and the following disclaimer.
20: * 2. Redistributions in binary form must reproduce the above copyright
21: * notice, this list of conditions and the following disclaimer in the
22: * documentation and/or other materials provided with the distribution.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.22 deraadt 34: */
1.1 deraadt 35:
36: #include "includes.h"
1.72.2.1 jason 37: #include <sys/queue.h>
1.72.2.3! miod 38: RCSID("$OpenBSD: ssh-agent.c,v 1.72.2.2 2002/05/17 00:03:24 miod Exp $");
1.47 markus 39:
40: #include <openssl/evp.h>
41: #include <openssl/md5.h>
1.1 deraadt 42:
43: #include "ssh.h"
44: #include "rsa.h"
45: #include "buffer.h"
46: #include "bufaux.h"
47: #include "xmalloc.h"
48: #include "getput.h"
1.32 markus 49: #include "key.h"
50: #include "authfd.h"
1.37 markus 51: #include "compat.h"
1.47 markus 52: #include "log.h"
1.7 deraadt 53:
1.59 markus 54: #ifdef SMARTCARD
55: #include "scard.h"
1.71 jakob 56: #endif
1.59 markus 57:
1.72.2.1 jason 58: typedef enum {
59: AUTH_UNUSED,
60: AUTH_SOCKET,
61: AUTH_CONNECTION
62: } sock_type;
63:
1.21 markus 64: typedef struct {
65: int fd;
1.72.2.1 jason 66: sock_type type;
1.21 markus 67: Buffer input;
68: Buffer output;
1.72.2.3! miod 69: Buffer request;
1.1 deraadt 70: } SocketEntry;
71:
1.45 markus 72: u_int sockets_alloc = 0;
1.1 deraadt 73: SocketEntry *sockets = NULL;
74:
1.72.2.1 jason 75: typedef struct identity {
76: TAILQ_ENTRY(identity) next;
1.33 markus 77: Key *key;
1.21 markus 78: char *comment;
1.72.2.3! miod 79: u_int death;
1.1 deraadt 80: } Identity;
81:
1.33 markus 82: typedef struct {
83: int nentries;
1.72.2.1 jason 84: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 85: } Idtab;
86:
87: /* private key table, one per protocol version */
88: Idtab idtable[3];
1.1 deraadt 89:
90: int max_fd = 0;
91:
1.11 markus 92: /* pid of shell == parent of agent */
1.29 deraadt 93: pid_t parent_pid = -1;
1.10 markus 94:
95: /* pathname and directory for AUTH_SOCKET */
96: char socket_name[1024];
97: char socket_dir[1024];
98:
1.72.2.3! miod 99: /* locking */
! 100: int locked = 0;
! 101: char *lock_passwd = NULL;
! 102:
1.20 markus 103: extern char *__progname;
104:
1.55 itojun 105: static void
1.33 markus 106: idtab_init(void)
1.1 deraadt 107: {
1.33 markus 108: int i;
1.72.2.1 jason 109: for (i = 0; i <=2; i++) {
110: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 111: idtable[i].nentries = 0;
112: }
113: }
114:
115: /* return private key table for requested protocol version */
1.55 itojun 116: static Idtab *
1.33 markus 117: idtab_lookup(int version)
118: {
119: if (version < 1 || version > 2)
120: fatal("internal error, bad protocol version %d", version);
121: return &idtable[version];
122: }
123:
1.72.2.3! miod 124: static void
! 125: free_identity(Identity *id)
! 126: {
! 127: key_free(id->key);
! 128: xfree(id->comment);
! 129: xfree(id);
! 130: }
! 131:
1.33 markus 132: /* return matching private key for given public key */
1.72.2.1 jason 133: static Identity *
134: lookup_identity(Key *key, int version)
1.33 markus 135: {
1.72.2.1 jason 136: Identity *id;
137:
1.33 markus 138: Idtab *tab = idtab_lookup(version);
1.72.2.1 jason 139: TAILQ_FOREACH(id, &tab->idlist, next) {
140: if (key_equal(key, id->key))
141: return (id);
1.33 markus 142: }
1.72.2.1 jason 143: return (NULL);
144: }
145:
1.33 markus 146: /* send list of supported public keys to 'client' */
1.55 itojun 147: static void
1.33 markus 148: process_request_identities(SocketEntry *e, int version)
149: {
150: Idtab *tab = idtab_lookup(version);
1.21 markus 151: Buffer msg;
1.72.2.1 jason 152: Identity *id;
1.1 deraadt 153:
1.21 markus 154: buffer_init(&msg);
1.33 markus 155: buffer_put_char(&msg, (version == 1) ?
156: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
157: buffer_put_int(&msg, tab->nentries);
1.72.2.1 jason 158: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 159: if (id->key->type == KEY_RSA1) {
1.33 markus 160: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
161: buffer_put_bignum(&msg, id->key->rsa->e);
162: buffer_put_bignum(&msg, id->key->rsa->n);
163: } else {
1.45 markus 164: u_char *blob;
165: u_int blen;
1.39 markus 166: key_to_blob(id->key, &blob, &blen);
1.33 markus 167: buffer_put_string(&msg, blob, blen);
168: xfree(blob);
169: }
170: buffer_put_cstring(&msg, id->comment);
1.21 markus 171: }
172: buffer_put_int(&e->output, buffer_len(&msg));
173: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
174: buffer_free(&msg);
1.1 deraadt 175: }
176:
1.33 markus 177: /* ssh1 only */
1.55 itojun 178: static void
1.33 markus 179: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 180: {
1.72.2.1 jason 181: Identity *id;
182: Key *key;
1.33 markus 183: BIGNUM *challenge;
184: int i, len;
1.21 markus 185: Buffer msg;
186: MD5_CTX md;
1.45 markus 187: u_char buf[32], mdbuf[16], session_id[16];
188: u_int response_type;
1.21 markus 189:
190: buffer_init(&msg);
1.39 markus 191: key = key_new(KEY_RSA1);
1.72.2.1 jason 192: if ((challenge = BN_new()) == NULL)
193: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 194:
1.72.2.3! miod 195: buffer_get_int(&e->request); /* ignored */
! 196: buffer_get_bignum(&e->request, key->rsa->e);
! 197: buffer_get_bignum(&e->request, key->rsa->n);
! 198: buffer_get_bignum(&e->request, challenge);
1.21 markus 199:
1.33 markus 200: /* Only protocol 1.1 is supported */
1.72.2.3! miod 201: if (buffer_len(&e->request) == 0)
1.33 markus 202: goto failure;
1.72.2.3! miod 203: buffer_get(&e->request, session_id, 16);
! 204: response_type = buffer_get_int(&e->request);
1.33 markus 205: if (response_type != 1)
206: goto failure;
207:
1.72.2.1 jason 208: id = lookup_identity(key, 1);
209: if (id != NULL) {
210: Key *private = id->key;
1.33 markus 211: /* Decrypt the challenge using the private key. */
1.49 markus 212: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
213: goto failure;
1.33 markus 214:
215: /* The response is MD5 of decrypted challenge plus session id. */
216: len = BN_num_bytes(challenge);
217: if (len <= 0 || len > 32) {
218: log("process_authentication_challenge: bad challenge length %d", len);
219: goto failure;
220: }
221: memset(buf, 0, 32);
222: BN_bn2bin(challenge, buf + 32 - len);
223: MD5_Init(&md);
224: MD5_Update(&md, buf, 32);
225: MD5_Update(&md, session_id, 16);
226: MD5_Final(mdbuf, &md);
227:
228: /* Send the response. */
229: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
230: for (i = 0; i < 16; i++)
231: buffer_put_char(&msg, mdbuf[i]);
232: goto send;
233: }
1.21 markus 234:
1.33 markus 235: failure:
236: /* Unknown identity or protocol error. Send failure. */
1.21 markus 237: buffer_put_char(&msg, SSH_AGENT_FAILURE);
238: send:
239: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 240: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
241: key_free(key);
242: BN_clear_free(challenge);
243: buffer_free(&msg);
244: }
245:
246: /* ssh2 only */
1.55 itojun 247: static void
1.33 markus 248: process_sign_request2(SocketEntry *e)
249: {
250: extern int datafellows;
1.72.2.1 jason 251: Key *key;
1.45 markus 252: u_char *blob, *data, *signature = NULL;
253: u_int blen, dlen, slen = 0;
1.37 markus 254: int flags;
1.33 markus 255: Buffer msg;
256: int ok = -1;
257:
258: datafellows = 0;
1.43 markus 259:
1.72.2.3! miod 260: blob = buffer_get_string(&e->request, &blen);
! 261: data = buffer_get_string(&e->request, &dlen);
1.37 markus 262:
1.72.2.3! miod 263: flags = buffer_get_int(&e->request);
1.37 markus 264: if (flags & SSH_AGENT_OLD_SIGNATURE)
265: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 266:
1.39 markus 267: key = key_from_blob(blob, blen);
1.33 markus 268: if (key != NULL) {
1.72.2.1 jason 269: Identity *id = lookup_identity(key, 2);
270: if (id != NULL)
271: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.33 markus 272: }
273: key_free(key);
274: buffer_init(&msg);
275: if (ok == 0) {
276: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
277: buffer_put_string(&msg, signature, slen);
278: } else {
279: buffer_put_char(&msg, SSH_AGENT_FAILURE);
280: }
281: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 282: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 283: buffer_len(&msg));
1.21 markus 284: buffer_free(&msg);
1.33 markus 285: xfree(data);
286: xfree(blob);
287: if (signature != NULL)
288: xfree(signature);
1.1 deraadt 289: }
290:
1.33 markus 291: /* shared */
1.55 itojun 292: static void
1.33 markus 293: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 294: {
1.72.2.1 jason 295: Key *key = NULL;
1.45 markus 296: u_char *blob;
297: u_int blen;
298: u_int bits;
1.33 markus 299: int success = 0;
1.21 markus 300:
1.72.2.1 jason 301: switch (version) {
1.33 markus 302: case 1:
1.39 markus 303: key = key_new(KEY_RSA1);
1.72.2.3! miod 304: bits = buffer_get_int(&e->request);
! 305: buffer_get_bignum(&e->request, key->rsa->e);
! 306: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 307:
308: if (bits != key_size(key))
309: log("Warning: identity keysize mismatch: actual %d, announced %d",
1.46 markus 310: key_size(key), bits);
1.33 markus 311: break;
312: case 2:
1.72.2.3! miod 313: blob = buffer_get_string(&e->request, &blen);
1.39 markus 314: key = key_from_blob(blob, blen);
1.33 markus 315: xfree(blob);
316: break;
317: }
318: if (key != NULL) {
1.72.2.1 jason 319: Identity *id = lookup_identity(key, version);
320: if (id != NULL) {
1.23 markus 321: /*
322: * We have this key. Free the old key. Since we
323: * don\'t want to leave empty slots in the middle of
1.40 markus 324: * the array, we actually free the key there and move
325: * all the entries between the empty slot and the end
326: * of the array.
1.23 markus 327: */
1.33 markus 328: Idtab *tab = idtab_lookup(version);
1.38 markus 329: if (tab->nentries < 1)
330: fatal("process_remove_identity: "
331: "internal error: tab->nentries %d",
332: tab->nentries);
1.72.2.1 jason 333: TAILQ_REMOVE(&tab->idlist, id, next);
334: free_identity(id);
1.33 markus 335: tab->nentries--;
336: success = 1;
1.21 markus 337: }
1.33 markus 338: key_free(key);
339: }
1.1 deraadt 340: buffer_put_int(&e->output, 1);
1.33 markus 341: buffer_put_char(&e->output,
342: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 343: }
344:
1.55 itojun 345: static void
1.33 markus 346: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 347: {
1.33 markus 348: Idtab *tab = idtab_lookup(version);
1.72.2.1 jason 349: Identity *id;
1.21 markus 350:
351: /* Loop over all identities and clear the keys. */
1.72.2.1 jason 352: for (id = TAILQ_FIRST(&tab->idlist); id;
353: id = TAILQ_FIRST(&tab->idlist)) {
354: TAILQ_REMOVE(&tab->idlist, id, next);
355: free_identity(id);
1.21 markus 356: }
357:
358: /* Mark that there are no identities. */
1.33 markus 359: tab->nentries = 0;
1.21 markus 360:
361: /* Send success. */
362: buffer_put_int(&e->output, 1);
363: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.72.2.3! miod 364: }
! 365:
! 366: static void
! 367: reaper(void)
! 368: {
! 369: Idtab *tab;
! 370: Identity *id, *nxt;
! 371: int version;
! 372: u_int now = time(NULL);
! 373:
! 374: for (version = 1; version < 3; version++) {
! 375: tab = idtab_lookup(version);
! 376: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
! 377: nxt = TAILQ_NEXT(id, next);
! 378: if (id->death != 0 && now >= id->death) {
! 379: TAILQ_REMOVE(&tab->idlist, id, next);
! 380: free_identity(id);
! 381: tab->nentries--;
! 382: }
! 383: }
! 384: }
1.1 deraadt 385: }
386:
1.55 itojun 387: static void
1.33 markus 388: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 389: {
1.33 markus 390: Key *k = NULL;
1.39 markus 391: char *type_name;
1.33 markus 392: char *comment;
1.72.2.3! miod 393: int type, success = 0, death = 0;
1.33 markus 394: Idtab *tab = idtab_lookup(version);
395:
396: switch (version) {
397: case 1:
1.39 markus 398: k = key_new_private(KEY_RSA1);
1.72.2.3! miod 399: buffer_get_int(&e->request); /* ignored */
! 400: buffer_get_bignum(&e->request, k->rsa->n);
! 401: buffer_get_bignum(&e->request, k->rsa->e);
! 402: buffer_get_bignum(&e->request, k->rsa->d);
! 403: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 404:
405: /* SSH and SSL have p and q swapped */
1.72.2.3! miod 406: buffer_get_bignum(&e->request, k->rsa->q); /* p */
! 407: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 408:
409: /* Generate additional parameters */
1.60 markus 410: rsa_generate_additional_parameters(k->rsa);
1.33 markus 411: break;
412: case 2:
1.72.2.3! miod 413: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 414: type = key_type_from_name(type_name);
1.39 markus 415: xfree(type_name);
1.72.2.1 jason 416: switch (type) {
1.39 markus 417: case KEY_DSA:
418: k = key_new_private(type);
1.72.2.3! miod 419: buffer_get_bignum2(&e->request, k->dsa->p);
! 420: buffer_get_bignum2(&e->request, k->dsa->q);
! 421: buffer_get_bignum2(&e->request, k->dsa->g);
! 422: buffer_get_bignum2(&e->request, k->dsa->pub_key);
! 423: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 424: break;
425: case KEY_RSA:
426: k = key_new_private(type);
1.72.2.3! miod 427: buffer_get_bignum2(&e->request, k->rsa->n);
! 428: buffer_get_bignum2(&e->request, k->rsa->e);
! 429: buffer_get_bignum2(&e->request, k->rsa->d);
! 430: buffer_get_bignum2(&e->request, k->rsa->iqmp);
! 431: buffer_get_bignum2(&e->request, k->rsa->p);
! 432: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 433:
434: /* Generate additional parameters */
1.60 markus 435: rsa_generate_additional_parameters(k->rsa);
1.39 markus 436: break;
437: default:
1.72.2.3! miod 438: buffer_clear(&e->request);
1.33 markus 439: goto send;
1.21 markus 440: }
1.33 markus 441: break;
442: }
1.72.2.3! miod 443: comment = buffer_get_string(&e->request, NULL);
1.33 markus 444: if (k == NULL) {
445: xfree(comment);
446: goto send;
447: }
448: success = 1;
1.72.2.3! miod 449: while (buffer_len(&e->request)) {
! 450: switch (buffer_get_char(&e->request)) {
! 451: case SSH_AGENT_CONSTRAIN_LIFETIME:
! 452: death = time(NULL) + buffer_get_int(&e->request);
! 453: break;
! 454: default:
! 455: break;
! 456: }
! 457: }
1.72.2.1 jason 458: if (lookup_identity(k, version) == NULL) {
459: Identity *id = xmalloc(sizeof(Identity));
460: id->key = k;
461: id->comment = comment;
1.72.2.3! miod 462: id->death = death;
1.72.2.1 jason 463: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 464: /* Increment the number of identities. */
465: tab->nentries++;
466: } else {
467: key_free(k);
468: xfree(comment);
469: }
470: send:
1.1 deraadt 471: buffer_put_int(&e->output, 1);
1.33 markus 472: buffer_put_char(&e->output,
473: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 474: }
475:
1.72.2.3! miod 476: /* XXX todo: encrypt sensitive data with passphrase */
! 477: static void
! 478: process_lock_agent(SocketEntry *e, int lock)
! 479: {
! 480: char *passwd;
! 481: int success = 0;
! 482:
! 483: passwd = buffer_get_string(&e->request, NULL);
! 484: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
! 485: locked = 0;
! 486: memset(lock_passwd, 0, strlen(lock_passwd));
! 487: xfree(lock_passwd);
! 488: lock_passwd = NULL;
! 489: success = 1;
! 490: } else if (!locked && lock) {
! 491: locked = 1;
! 492: lock_passwd = xstrdup(passwd);
! 493: success = 1;
! 494: }
! 495: memset(passwd, 0, strlen(passwd));
! 496: xfree(passwd);
! 497:
! 498: buffer_put_int(&e->output, 1);
! 499: buffer_put_char(&e->output,
! 500: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
! 501: }
! 502:
! 503: static void
! 504: no_identities(SocketEntry *e, u_int type)
! 505: {
! 506: Buffer msg;
! 507:
! 508: buffer_init(&msg);
! 509: buffer_put_char(&msg,
! 510: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
! 511: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
! 512: buffer_put_int(&msg, 0);
! 513: buffer_put_int(&e->output, buffer_len(&msg));
! 514: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
! 515: buffer_free(&msg);
! 516: }
1.59 markus 517:
518: #ifdef SMARTCARD
519: static void
520: process_add_smartcard_key (SocketEntry *e)
521: {
1.72.2.2 miod 522: Identity *id;
1.59 markus 523: Idtab *tab;
1.72.2.2 miod 524: Key **keys, *k;
525: char *sc_reader_id = NULL, *pin;
526: int i, version, success = 0;
1.72.2.1 jason 527:
1.72.2.3! miod 528: sc_reader_id = buffer_get_string(&e->request, NULL);
! 529: pin = buffer_get_string(&e->request, NULL);
1.72.2.2 miod 530: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 531: xfree(sc_reader_id);
1.72.2.2 miod 532: xfree(pin);
1.59 markus 533:
1.72.2.2 miod 534: if (keys == NULL || keys[0] == NULL) {
535: error("sc_get_keys failed");
1.59 markus 536: goto send;
537: }
1.72.2.2 miod 538: for (i = 0; keys[i] != NULL; i++) {
539: k = keys[i];
540: version = k->type == KEY_RSA1 ? 1 : 2;
541: tab = idtab_lookup(version);
542: if (lookup_identity(k, version) == NULL) {
543: id = xmalloc(sizeof(Identity));
544: id->key = k;
545: id->comment = xstrdup("smartcard key");
1.72.2.3! miod 546: id->death = 0;
1.72.2.2 miod 547: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
548: tab->nentries++;
549: success = 1;
550: } else {
551: key_free(k);
552: }
553: keys[i] = NULL;
1.59 markus 554: }
1.72.2.2 miod 555: xfree(keys);
1.59 markus 556: send:
557: buffer_put_int(&e->output, 1);
558: buffer_put_char(&e->output,
559: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
560: }
561:
562: static void
563: process_remove_smartcard_key(SocketEntry *e)
564: {
1.72.2.2 miod 565: Identity *id;
566: Idtab *tab;
567: Key **keys, *k = NULL;
568: char *sc_reader_id = NULL, *pin;
569: int i, version, success = 0;
1.59 markus 570:
1.72.2.3! miod 571: sc_reader_id = buffer_get_string(&e->request, NULL);
! 572: pin = buffer_get_string(&e->request, NULL);
1.72.2.2 miod 573: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 574: xfree(sc_reader_id);
1.72.2.2 miod 575: xfree(pin);
1.59 markus 576:
1.72.2.2 miod 577: if (keys == NULL || keys[0] == NULL) {
578: error("sc_get_keys failed");
579: goto send;
580: }
581: for (i = 0; keys[i] != NULL; i++) {
582: k = keys[i];
583: version = k->type == KEY_RSA1 ? 1 : 2;
584: if ((id = lookup_identity(k, version)) != NULL) {
585: tab = idtab_lookup(version);
1.72.2.3! miod 586: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 587: tab->nentries--;
1.72.2.1 jason 588: free_identity(id);
1.59 markus 589: success = 1;
590: }
591: key_free(k);
1.72.2.2 miod 592: keys[i] = NULL;
1.59 markus 593: }
1.72.2.2 miod 594: xfree(keys);
595: send:
1.59 markus 596: buffer_put_int(&e->output, 1);
597: buffer_put_char(&e->output,
598: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
599: }
1.70 jakob 600: #endif /* SMARTCARD */
1.59 markus 601:
1.33 markus 602: /* dispatch incoming messages */
603:
1.55 itojun 604: static void
1.2 provos 605: process_message(SocketEntry *e)
1.1 deraadt 606: {
1.45 markus 607: u_int msg_len;
608: u_int type;
609: u_char *cp;
1.72.2.3! miod 610:
! 611: /* kill dead keys */
! 612: reaper();
! 613:
1.21 markus 614: if (buffer_len(&e->input) < 5)
615: return; /* Incomplete message. */
1.72.2.1 jason 616: cp = buffer_ptr(&e->input);
1.21 markus 617: msg_len = GET_32BIT(cp);
618: if (msg_len > 256 * 1024) {
619: shutdown(e->fd, SHUT_RDWR);
620: close(e->fd);
621: e->type = AUTH_UNUSED;
1.72.2.3! miod 622: buffer_free(&e->input);
! 623: buffer_free(&e->output);
! 624: buffer_free(&e->request);
1.21 markus 625: return;
626: }
627: if (buffer_len(&e->input) < msg_len + 4)
628: return;
1.72.2.3! miod 629:
! 630: /* move the current input to e->request */
1.21 markus 631: buffer_consume(&e->input, 4);
1.72.2.3! miod 632: buffer_clear(&e->request);
! 633: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
! 634: buffer_consume(&e->input, msg_len);
! 635: type = buffer_get_char(&e->request);
! 636:
! 637: /* check wheter agent is locked */
! 638: if (locked && type != SSH_AGENTC_UNLOCK) {
! 639: buffer_clear(&e->request);
! 640: switch (type) {
! 641: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
! 642: case SSH2_AGENTC_REQUEST_IDENTITIES:
! 643: /* send empty lists */
! 644: no_identities(e, type);
! 645: break;
! 646: default:
! 647: /* send a fail message for all other request types */
! 648: buffer_put_int(&e->output, 1);
! 649: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
! 650: }
! 651: return;
! 652: }
1.21 markus 653:
1.59 markus 654: debug("type %d", type);
1.21 markus 655: switch (type) {
1.72.2.3! miod 656: case SSH_AGENTC_LOCK:
! 657: case SSH_AGENTC_UNLOCK:
! 658: process_lock_agent(e, type == SSH_AGENTC_LOCK);
! 659: break;
1.33 markus 660: /* ssh1 */
661: case SSH_AGENTC_RSA_CHALLENGE:
662: process_authentication_challenge1(e);
663: break;
1.21 markus 664: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 665: process_request_identities(e, 1);
1.21 markus 666: break;
667: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.72.2.3! miod 668: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 669: process_add_identity(e, 1);
1.21 markus 670: break;
671: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 672: process_remove_identity(e, 1);
1.21 markus 673: break;
674: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 675: process_remove_all_identities(e, 1);
676: break;
677: /* ssh2 */
678: case SSH2_AGENTC_SIGN_REQUEST:
679: process_sign_request2(e);
680: break;
681: case SSH2_AGENTC_REQUEST_IDENTITIES:
682: process_request_identities(e, 2);
683: break;
684: case SSH2_AGENTC_ADD_IDENTITY:
1.72.2.3! miod 685: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 686: process_add_identity(e, 2);
687: break;
688: case SSH2_AGENTC_REMOVE_IDENTITY:
689: process_remove_identity(e, 2);
690: break;
691: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
692: process_remove_all_identities(e, 2);
1.21 markus 693: break;
1.59 markus 694: #ifdef SMARTCARD
695: case SSH_AGENTC_ADD_SMARTCARD_KEY:
696: process_add_smartcard_key(e);
1.72.2.1 jason 697: break;
1.59 markus 698: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
699: process_remove_smartcard_key(e);
1.72.2.1 jason 700: break;
1.70 jakob 701: #endif /* SMARTCARD */
1.21 markus 702: default:
703: /* Unknown message. Respond with failure. */
704: error("Unknown message %d", type);
1.72.2.3! miod 705: buffer_clear(&e->request);
1.21 markus 706: buffer_put_int(&e->output, 1);
707: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
708: break;
709: }
1.1 deraadt 710: }
711:
1.55 itojun 712: static void
1.72.2.1 jason 713: new_socket(sock_type type, int fd)
1.1 deraadt 714: {
1.45 markus 715: u_int i, old_alloc;
1.21 markus 716: if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
717: error("fcntl O_NONBLOCK: %s", strerror(errno));
718:
719: if (fd > max_fd)
720: max_fd = fd;
721:
722: for (i = 0; i < sockets_alloc; i++)
723: if (sockets[i].type == AUTH_UNUSED) {
724: sockets[i].fd = fd;
725: sockets[i].type = type;
726: buffer_init(&sockets[i].input);
727: buffer_init(&sockets[i].output);
1.72.2.3! miod 728: buffer_init(&sockets[i].request);
1.21 markus 729: return;
730: }
731: old_alloc = sockets_alloc;
732: sockets_alloc += 10;
733: if (sockets)
734: sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0]));
735: else
736: sockets = xmalloc(sockets_alloc * sizeof(sockets[0]));
737: for (i = old_alloc; i < sockets_alloc; i++)
738: sockets[i].type = AUTH_UNUSED;
739: sockets[old_alloc].type = type;
740: sockets[old_alloc].fd = fd;
741: buffer_init(&sockets[old_alloc].input);
742: buffer_init(&sockets[old_alloc].output);
1.72.2.3! miod 743: buffer_init(&sockets[old_alloc].request);
1.1 deraadt 744: }
745:
1.55 itojun 746: static int
1.66 markus 747: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, int *nallocp)
1.1 deraadt 748: {
1.46 markus 749: u_int i, sz;
750: int n = 0;
751:
752: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 753: switch (sockets[i].type) {
754: case AUTH_SOCKET:
755: case AUTH_CONNECTION:
1.46 markus 756: n = MAX(n, sockets[i].fd);
1.21 markus 757: break;
758: case AUTH_UNUSED:
759: break;
760: default:
761: fatal("Unknown socket type %d", sockets[i].type);
762: break;
763: }
1.46 markus 764: }
765:
766: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 767: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 768: if (*fdrp)
1.54 stevesk 769: xfree(*fdrp);
1.46 markus 770: if (*fdwp)
1.54 stevesk 771: xfree(*fdwp);
1.46 markus 772: *fdrp = xmalloc(sz);
773: *fdwp = xmalloc(sz);
1.66 markus 774: *nallocp = sz;
1.46 markus 775: }
1.66 markus 776: if (n < *fdl)
777: debug("XXX shrink: %d < %d", n, *fdl);
778: *fdl = n;
1.46 markus 779: memset(*fdrp, 0, sz);
780: memset(*fdwp, 0, sz);
781:
782: for (i = 0; i < sockets_alloc; i++) {
783: switch (sockets[i].type) {
784: case AUTH_SOCKET:
785: case AUTH_CONNECTION:
786: FD_SET(sockets[i].fd, *fdrp);
787: if (buffer_len(&sockets[i].output) > 0)
788: FD_SET(sockets[i].fd, *fdwp);
789: break;
790: default:
791: break;
792: }
793: }
794: return (1);
1.21 markus 795: }
796:
1.55 itojun 797: static void
1.21 markus 798: after_select(fd_set *readset, fd_set *writeset)
799: {
1.45 markus 800: u_int i;
1.21 markus 801: int len, sock;
1.26 markus 802: socklen_t slen;
1.21 markus 803: char buf[1024];
804: struct sockaddr_un sunaddr;
805:
806: for (i = 0; i < sockets_alloc; i++)
807: switch (sockets[i].type) {
808: case AUTH_UNUSED:
809: break;
810: case AUTH_SOCKET:
811: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 812: slen = sizeof(sunaddr);
1.46 markus 813: sock = accept(sockets[i].fd,
814: (struct sockaddr *) &sunaddr, &slen);
1.21 markus 815: if (sock < 0) {
1.72.2.1 jason 816: error("accept from AUTH_SOCKET: %s",
817: strerror(errno));
1.21 markus 818: break;
819: }
820: new_socket(AUTH_CONNECTION, sock);
821: }
822: break;
823: case AUTH_CONNECTION:
824: if (buffer_len(&sockets[i].output) > 0 &&
825: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 826: do {
827: len = write(sockets[i].fd,
828: buffer_ptr(&sockets[i].output),
829: buffer_len(&sockets[i].output));
830: if (len == -1 && (errno == EAGAIN ||
831: errno == EINTR))
832: continue;
833: break;
834: } while (1);
1.21 markus 835: if (len <= 0) {
836: shutdown(sockets[i].fd, SHUT_RDWR);
837: close(sockets[i].fd);
838: sockets[i].type = AUTH_UNUSED;
1.30 djm 839: buffer_free(&sockets[i].input);
840: buffer_free(&sockets[i].output);
1.72.2.3! miod 841: buffer_free(&sockets[i].request);
1.21 markus 842: break;
843: }
844: buffer_consume(&sockets[i].output, len);
845: }
846: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 847: do {
848: len = read(sockets[i].fd, buf, sizeof(buf));
849: if (len == -1 && (errno == EAGAIN ||
850: errno == EINTR))
851: continue;
852: break;
853: } while (1);
1.21 markus 854: if (len <= 0) {
855: shutdown(sockets[i].fd, SHUT_RDWR);
856: close(sockets[i].fd);
857: sockets[i].type = AUTH_UNUSED;
1.30 djm 858: buffer_free(&sockets[i].input);
859: buffer_free(&sockets[i].output);
1.72.2.3! miod 860: buffer_free(&sockets[i].request);
1.21 markus 861: break;
862: }
863: buffer_append(&sockets[i].input, buf, len);
864: process_message(&sockets[i]);
865: }
866: break;
867: default:
868: fatal("Unknown type %d", sockets[i].type);
869: }
1.1 deraadt 870: }
871:
1.55 itojun 872: static void
1.72.2.1 jason 873: cleanup_socket(void *p)
1.15 markus 874: {
1.48 deraadt 875: if (socket_name[0])
876: unlink(socket_name);
877: if (socket_dir[0])
878: rmdir(socket_dir);
1.10 markus 879: }
880:
1.55 itojun 881: static void
1.15 markus 882: cleanup_exit(int i)
883: {
1.72.2.1 jason 884: cleanup_socket(NULL);
1.21 markus 885: exit(i);
1.15 markus 886: }
887:
1.55 itojun 888: static void
1.48 deraadt 889: cleanup_handler(int sig)
890: {
1.72.2.1 jason 891: cleanup_socket(NULL);
1.48 deraadt 892: _exit(2);
1.68 markus 893: }
894:
895: static void
896: check_parent_exists(int sig)
897: {
898: int save_errno = errno;
899:
900: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
901: /* printf("Parent has died - Authentication agent exiting.\n"); */
902: cleanup_handler(sig); /* safe */
903: }
904: signal(SIGALRM, check_parent_exists);
905: alarm(10);
906: errno = save_errno;
1.48 deraadt 907: }
908:
1.55 itojun 909: static void
1.50 itojun 910: usage(void)
1.15 markus 911: {
1.72 jakob 912: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 913: __progname);
1.72 jakob 914: fprintf(stderr, "Options:\n");
915: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
916: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
917: fprintf(stderr, " -k Kill the current agent.\n");
918: fprintf(stderr, " -d Debug mode.\n");
1.72.2.3! miod 919: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.21 markus 920: exit(1);
1.15 markus 921: }
922:
1.2 provos 923: int
924: main(int ac, char **av)
1.1 deraadt 925: {
1.66 markus 926: int sock, c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0, ch, nalloc;
1.21 markus 927: struct sockaddr_un sunaddr;
1.41 markus 928: struct rlimit rlim;
1.21 markus 929: pid_t pid;
930: char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid];
1.72.2.3! miod 931: char *agentsocket = NULL;
1.43 markus 932: extern int optind;
1.46 markus 933: fd_set *readsetp = NULL, *writesetp = NULL;
1.53 markus 934:
935: SSLeay_add_all_algorithms();
1.21 markus 936:
1.72.2.3! miod 937: while ((ch = getopt(ac, av, "cdksa:")) != -1) {
1.21 markus 938: switch (ch) {
939: case 'c':
940: if (s_flag)
941: usage();
942: c_flag++;
943: break;
944: case 'k':
945: k_flag++;
946: break;
947: case 's':
948: if (c_flag)
949: usage();
950: s_flag++;
951: break;
1.57 markus 952: case 'd':
953: if (d_flag)
954: usage();
955: d_flag++;
956: break;
1.72.2.3! miod 957: case 'a':
! 958: agentsocket = optarg;
! 959: break;
1.21 markus 960: default:
961: usage();
962: }
963: }
964: ac -= optind;
965: av += optind;
966:
1.57 markus 967: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 968: usage();
969:
1.72.2.2 miod 970: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 971: shell = getenv("SHELL");
972: if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
973: c_flag = 1;
974: }
975: if (k_flag) {
976: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
977: if (pidstr == NULL) {
978: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 979: SSH_AGENTPID_ENV_NAME);
1.21 markus 980: exit(1);
981: }
982: pid = atoi(pidstr);
1.46 markus 983: if (pid < 1) {
1.21 markus 984: fprintf(stderr, "%s=\"%s\", which is not a good PID\n",
1.46 markus 985: SSH_AGENTPID_ENV_NAME, pidstr);
1.21 markus 986: exit(1);
987: }
988: if (kill(pid, SIGTERM) == -1) {
989: perror("kill");
990: exit(1);
991: }
992: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
993: printf(format, SSH_AUTHSOCKET_ENV_NAME);
994: printf(format, SSH_AGENTPID_ENV_NAME);
1.72.2.3! miod 995: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 996: exit(0);
997: }
998: parent_pid = getpid();
999:
1.72.2.3! miod 1000: if (agentsocket == NULL) {
! 1001: /* Create private directory for agent socket */
! 1002: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir);
! 1003: if (mkdtemp(socket_dir) == NULL) {
! 1004: perror("mkdtemp: private socket dir");
! 1005: exit(1);
! 1006: }
! 1007: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
! 1008: (long)parent_pid);
! 1009: } else {
! 1010: /* Try to use specified agent socket */
! 1011: socket_dir[0] = '\0';
! 1012: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1013: }
1014:
1.23 markus 1015: /*
1016: * Create socket early so it will exist before command gets run from
1017: * the parent.
1018: */
1.21 markus 1019: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1020: if (sock < 0) {
1021: perror("socket");
1022: cleanup_exit(1);
1023: }
1024: memset(&sunaddr, 0, sizeof(sunaddr));
1025: sunaddr.sun_family = AF_UNIX;
1026: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1027: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) {
1028: perror("bind");
1029: cleanup_exit(1);
1030: }
1031: if (listen(sock, 5) < 0) {
1032: perror("listen");
1033: cleanup_exit(1);
1034: }
1.46 markus 1035:
1.23 markus 1036: /*
1037: * Fork, and have the parent execute the command, if any, or present
1038: * the socket data. The child continues as the authentication agent.
1039: */
1.57 markus 1040: if (d_flag) {
1041: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1042: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1043: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1044: SSH_AUTHSOCKET_ENV_NAME);
1.72.2.3! miod 1045: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1046: goto skip;
1047: }
1.21 markus 1048: pid = fork();
1049: if (pid == -1) {
1050: perror("fork");
1.72.2.1 jason 1051: cleanup_exit(1);
1.21 markus 1052: }
1053: if (pid != 0) { /* Parent - execute the given command. */
1054: close(sock);
1.72.2.3! miod 1055: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1056: if (ac == 0) {
1057: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1058: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1059: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1060: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1061: SSH_AGENTPID_ENV_NAME);
1.72.2.3! miod 1062: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1063: exit(0);
1064: }
1.36 deraadt 1065: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1066: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1067: perror("setenv");
1068: exit(1);
1069: }
1.21 markus 1070: execvp(av[0], av);
1071: perror(av[0]);
1072: exit(1);
1073: }
1.72.2.1 jason 1074: /* child */
1075: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1076:
1077: if (setsid() == -1) {
1.72.2.1 jason 1078: error("setsid: %s", strerror(errno));
1.67 stevesk 1079: cleanup_exit(1);
1080: }
1081:
1082: (void)chdir("/");
1.21 markus 1083: close(0);
1084: close(1);
1085: close(2);
1086:
1.41 markus 1087: /* deny core dumps, since memory contains unencrypted private keys */
1088: rlim.rlim_cur = rlim.rlim_max = 0;
1089: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.72.2.1 jason 1090: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1091: cleanup_exit(1);
1092: }
1.57 markus 1093:
1094: skip:
1.72.2.1 jason 1095: fatal_add_cleanup(cleanup_socket, NULL);
1.21 markus 1096: new_socket(AUTH_SOCKET, sock);
1097: if (ac > 0) {
1098: signal(SIGALRM, check_parent_exists);
1099: alarm(10);
1100: }
1.33 markus 1101: idtab_init();
1.61 markus 1102: if (!d_flag)
1.57 markus 1103: signal(SIGINT, SIG_IGN);
1.61 markus 1104: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1105: signal(SIGHUP, cleanup_handler);
1106: signal(SIGTERM, cleanup_handler);
1.66 markus 1107: nalloc = 0;
1108:
1.21 markus 1109: while (1) {
1.66 markus 1110: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1111: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1112: if (errno == EINTR)
1113: continue;
1.72.2.1 jason 1114: fatal("select: %s", strerror(errno));
1.21 markus 1115: }
1.46 markus 1116: after_select(readsetp, writesetp);
1.15 markus 1117: }
1.21 markus 1118: /* NOTREACHED */
1.1 deraadt 1119: }
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