Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.297.4.1
1.297.4.1! bluhm 1: /* $OpenBSD: ssh-agent.c,v 1.297 2023/03/09 21:06:24 jcs 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>
1.238 djm 44: #include <sys/wait.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>
1.223 djm 53: #include <poll.h>
1.129 stevesk 54: #include <signal.h>
1.149 stevesk 55: #include <stdlib.h>
1.150 stevesk 56: #include <stdio.h>
1.146 stevesk 57: #include <string.h>
1.248 naddy 58: #include <stdarg.h>
1.196 deraadt 59: #include <limits.h>
1.145 stevesk 60: #include <time.h>
1.144 stevesk 61: #include <unistd.h>
1.203 dtucker 62: #include <util.h>
1.194 markus 63:
1.151 deraadt 64: #include "xmalloc.h"
1.1 deraadt 65: #include "ssh.h"
1.258 djm 66: #include "ssh2.h"
1.194 markus 67: #include "sshbuf.h"
68: #include "sshkey.h"
1.32 markus 69: #include "authfd.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"
1.215 djm 74: #include "match.h"
1.238 djm 75: #include "msg.h"
76: #include "pathnames.h"
1.163 markus 77: #include "ssh-pkcs11.h"
1.251 djm 78: #include "sk-api.h"
1.281 djm 79: #include "myproposal.h"
1.59 markus 80:
1.262 djm 81: #ifndef DEFAULT_ALLOWED_PROVIDERS
82: # define DEFAULT_ALLOWED_PROVIDERS "/usr/lib*/*,/usr/local/lib*/*"
1.215 djm 83: #endif
84:
1.223 djm 85: /* Maximum accepted message length */
1.280 djm 86: #define AGENT_MAX_LEN (256*1024)
1.233 djm 87: /* Maximum bytes to read from client socket */
1.280 djm 88: #define AGENT_RBUF_LEN (4096)
89: /* Maximum number of recorded session IDs/hostkeys per connection */
90: #define AGENT_MAX_SESSION_IDS 16
91: /* Maximum size of session ID */
92: #define AGENT_MAX_SID_LEN 128
1.281 djm 93: /* Maximum number of destination constraints to accept on a key */
94: #define AGENT_MAX_DEST_CONSTRAINTS 1024
1.280 djm 95:
96: /* XXX store hostkey_sid in a refcounted tree */
1.223 djm 97:
1.73 stevesk 98: typedef enum {
1.275 djm 99: AUTH_UNUSED = 0,
100: AUTH_SOCKET = 1,
101: AUTH_CONNECTION = 2,
1.73 stevesk 102: } sock_type;
103:
1.280 djm 104: struct hostkey_sid {
105: struct sshkey *key;
106: struct sshbuf *sid;
107: int forwarded;
108: };
109:
1.274 djm 110: typedef struct socket_entry {
1.21 markus 111: int fd;
1.73 stevesk 112: sock_type type;
1.194 markus 113: struct sshbuf *input;
114: struct sshbuf *output;
115: struct sshbuf *request;
1.280 djm 116: size_t nsession_ids;
117: struct hostkey_sid *session_ids;
1.1 deraadt 118: } SocketEntry;
119:
1.45 markus 120: u_int sockets_alloc = 0;
1.1 deraadt 121: SocketEntry *sockets = NULL;
122:
1.78 provos 123: typedef struct identity {
124: TAILQ_ENTRY(identity) next;
1.194 markus 125: struct sshkey *key;
1.21 markus 126: char *comment;
1.163 markus 127: char *provider;
1.174 dtucker 128: time_t death;
1.107 markus 129: u_int confirm;
1.238 djm 130: char *sk_provider;
1.281 djm 131: struct dest_constraint *dest_constraints;
132: size_t ndest_constraints;
1.1 deraadt 133: } Identity;
134:
1.221 djm 135: struct idtable {
1.33 markus 136: int nentries;
1.78 provos 137: TAILQ_HEAD(idqueue, identity) idlist;
1.221 djm 138: };
1.33 markus 139:
1.221 djm 140: /* private key table */
141: struct idtable *idtab;
1.1 deraadt 142:
143: int max_fd = 0;
144:
1.11 markus 145: /* pid of shell == parent of agent */
1.29 deraadt 146: pid_t parent_pid = -1;
1.176 dtucker 147: time_t parent_alive_interval = 0;
1.10 markus 148:
1.187 djm 149: /* pid of process for which cleanup_socket is applicable */
150: pid_t cleanup_pid = 0;
151:
1.10 markus 152: /* pathname and directory for AUTH_SOCKET */
1.196 deraadt 153: char socket_name[PATH_MAX];
154: char socket_dir[PATH_MAX];
1.10 markus 155:
1.260 djm 156: /* Pattern-list of allowed PKCS#11/Security key paths */
157: static char *allowed_providers;
1.215 djm 158:
1.297.4.1! bluhm 159: /*
! 160: * Allows PKCS11 providers or SK keys that use non-internal providers to
! 161: * be added over a remote connection (identified by session-bind@openssh.com).
! 162: */
! 163: static int remote_add_provider;
! 164:
1.88 markus 165: /* locking */
1.203 dtucker 166: #define LOCK_SIZE 32
167: #define LOCK_SALT_SIZE 16
168: #define LOCK_ROUNDS 1
1.88 markus 169: int locked = 0;
1.213 djm 170: u_char lock_pwhash[LOCK_SIZE];
171: u_char lock_salt[LOCK_SALT_SIZE];
1.88 markus 172:
1.20 markus 173: extern char *__progname;
174:
1.174 dtucker 175: /* Default lifetime in seconds (0 == forever) */
1.268 dtucker 176: static int lifetime = 0;
1.106 marc 177:
1.192 djm 178: static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
179:
1.258 djm 180: /* Refuse signing of non-SSH messages for web-origin FIDO keys */
181: static int restrict_websafe = 1;
182:
1.55 itojun 183: static void
1.101 stevesk 184: close_socket(SocketEntry *e)
185: {
1.280 djm 186: size_t i;
187:
1.101 stevesk 188: close(e->fd);
1.194 markus 189: sshbuf_free(e->input);
190: sshbuf_free(e->output);
191: sshbuf_free(e->request);
1.280 djm 192: for (i = 0; i < e->nsession_ids; i++) {
193: sshkey_free(e->session_ids[i].key);
194: sshbuf_free(e->session_ids[i].sid);
195: }
196: free(e->session_ids);
1.269 djm 197: memset(e, '\0', sizeof(*e));
198: e->fd = -1;
199: e->type = AUTH_UNUSED;
1.101 stevesk 200: }
201:
202: static void
1.33 markus 203: idtab_init(void)
1.1 deraadt 204: {
1.221 djm 205: idtab = xcalloc(1, sizeof(*idtab));
206: TAILQ_INIT(&idtab->idlist);
207: idtab->nentries = 0;
1.33 markus 208: }
209:
1.89 markus 210: static void
1.281 djm 211: free_dest_constraint_hop(struct dest_constraint_hop *dch)
212: {
213: u_int i;
214:
215: if (dch == NULL)
216: return;
217: free(dch->user);
218: free(dch->hostname);
219: for (i = 0; i < dch->nkeys; i++)
220: sshkey_free(dch->keys[i]);
221: free(dch->keys);
222: free(dch->key_is_ca);
223: }
224:
225: static void
226: free_dest_constraints(struct dest_constraint *dcs, size_t ndcs)
227: {
228: size_t i;
229:
230: for (i = 0; i < ndcs; i++) {
231: free_dest_constraint_hop(&dcs[i].from);
232: free_dest_constraint_hop(&dcs[i].to);
233: }
234: free(dcs);
235: }
236:
237: static void
1.89 markus 238: free_identity(Identity *id)
239: {
1.194 markus 240: sshkey_free(id->key);
1.173 djm 241: free(id->provider);
242: free(id->comment);
1.238 djm 243: free(id->sk_provider);
1.281 djm 244: free_dest_constraints(id->dest_constraints, id->ndest_constraints);
1.173 djm 245: free(id);
1.89 markus 246: }
247:
1.281 djm 248: /*
249: * Match 'key' against the key/CA list in a destination constraint hop
250: * Returns 0 on success or -1 otherwise.
251: */
252: static int
253: match_key_hop(const char *tag, const struct sshkey *key,
254: const struct dest_constraint_hop *dch)
255: {
256: const char *reason = NULL;
1.286 dtucker 257: const char *hostname = dch->hostname ? dch->hostname : "(ORIGIN)";
1.281 djm 258: u_int i;
259: char *fp;
260:
261: if (key == NULL)
262: return -1;
263: /* XXX logspam */
264: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
265: SSH_FP_DEFAULT)) == NULL)
266: fatal_f("fingerprint failed");
267: debug3_f("%s: entering hostname %s, requested key %s %s, %u keys avail",
1.286 dtucker 268: tag, hostname, sshkey_type(key), fp, dch->nkeys);
1.281 djm 269: free(fp);
270: for (i = 0; i < dch->nkeys; i++) {
271: if (dch->keys[i] == NULL)
272: return -1;
273: /* XXX logspam */
274: if ((fp = sshkey_fingerprint(dch->keys[i], SSH_FP_HASH_DEFAULT,
275: SSH_FP_DEFAULT)) == NULL)
276: fatal_f("fingerprint failed");
277: debug3_f("%s: key %u: %s%s %s", tag, i,
278: dch->key_is_ca[i] ? "CA " : "",
279: sshkey_type(dch->keys[i]), fp);
280: free(fp);
281: if (!sshkey_is_cert(key)) {
282: /* plain key */
283: if (dch->key_is_ca[i] ||
284: !sshkey_equal(key, dch->keys[i]))
285: continue;
286: return 0;
287: }
288: /* certificate */
289: if (!dch->key_is_ca[i])
290: continue;
291: if (key->cert == NULL || key->cert->signature_key == NULL)
292: return -1; /* shouldn't happen */
293: if (!sshkey_equal(key->cert->signature_key, dch->keys[i]))
294: continue;
1.286 dtucker 295: if (sshkey_cert_check_host(key, hostname, 1,
1.281 djm 296: SSH_ALLOWED_CA_SIGALGS, &reason) != 0) {
297: debug_f("cert %s / hostname %s rejected: %s",
1.286 dtucker 298: key->cert->key_id, hostname, reason);
1.281 djm 299: continue;
300: }
301: return 0;
302: }
303: return -1;
304: }
305:
306: /* Check destination constraints on an identity against the hostkey/user */
307: static int
308: permitted_by_dest_constraints(const struct sshkey *fromkey,
309: const struct sshkey *tokey, Identity *id, const char *user,
310: const char **hostnamep)
311: {
312: size_t i;
313: struct dest_constraint *d;
314:
315: if (hostnamep != NULL)
316: *hostnamep = NULL;
317: for (i = 0; i < id->ndest_constraints; i++) {
318: d = id->dest_constraints + i;
319: /* XXX remove logspam */
320: debug2_f("constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)",
321: i, d->from.user ? d->from.user : "",
322: d->from.user ? "@" : "",
323: d->from.hostname ? d->from.hostname : "(ORIGIN)",
324: d->from.nkeys,
325: d->to.user ? d->to.user : "", d->to.user ? "@" : "",
326: d->to.hostname ? d->to.hostname : "(ANY)", d->to.nkeys);
327:
328: /* Match 'from' key */
329: if (fromkey == NULL) {
330: /* We are matching the first hop */
331: if (d->from.hostname != NULL || d->from.nkeys != 0)
332: continue;
333: } else if (match_key_hop("from", fromkey, &d->from) != 0)
334: continue;
335:
336: /* Match 'to' key */
337: if (tokey != NULL && match_key_hop("to", tokey, &d->to) != 0)
338: continue;
339:
340: /* Match user if specified */
341: if (d->to.user != NULL && user != NULL &&
342: !match_pattern(user, d->to.user))
343: continue;
344:
345: /* successfully matched this constraint */
346: if (hostnamep != NULL)
347: *hostnamep = d->to.hostname;
348: debug2_f("allowed for hostname %s",
349: d->to.hostname == NULL ? "*" : d->to.hostname);
350: return 0;
351: }
352: /* no match */
353: debug2_f("%s identity \"%s\" not permitted for this destination",
354: sshkey_type(id->key), id->comment);
355: return -1;
356: }
357:
358: /*
359: * Check whether hostkeys on a SocketEntry and the optionally specified user
360: * are permitted by the destination constraints on the Identity.
361: * Returns 0 on success or -1 otherwise.
362: */
363: static int
364: identity_permitted(Identity *id, SocketEntry *e, char *user,
365: const char **forward_hostnamep, const char **last_hostnamep)
366: {
367: size_t i;
368: const char **hp;
369: struct hostkey_sid *hks;
370: const struct sshkey *fromkey = NULL;
371: const char *test_user;
372: char *fp1, *fp2;
373:
374: /* XXX remove logspam */
375: debug3_f("entering: key %s comment \"%s\", %zu socket bindings, "
376: "%zu constraints", sshkey_type(id->key), id->comment,
377: e->nsession_ids, id->ndest_constraints);
378: if (id->ndest_constraints == 0)
379: return 0; /* unconstrained */
380: if (e->nsession_ids == 0)
381: return 0; /* local use */
382: /*
383: * Walk through the hops recorded by session_id and try to find a
384: * constraint that satisfies each.
385: */
386: for (i = 0; i < e->nsession_ids; i++) {
387: hks = e->session_ids + i;
388: if (hks->key == NULL)
389: fatal_f("internal error: no bound key");
390: /* XXX remove logspam */
391: fp1 = fp2 = NULL;
392: if (fromkey != NULL &&
393: (fp1 = sshkey_fingerprint(fromkey, SSH_FP_HASH_DEFAULT,
394: SSH_FP_DEFAULT)) == NULL)
395: fatal_f("fingerprint failed");
396: if ((fp2 = sshkey_fingerprint(hks->key, SSH_FP_HASH_DEFAULT,
397: SSH_FP_DEFAULT)) == NULL)
398: fatal_f("fingerprint failed");
399: debug3_f("socketentry fd=%d, entry %zu %s, "
400: "from hostkey %s %s to user %s hostkey %s %s",
401: e->fd, i, hks->forwarded ? "FORWARD" : "AUTH",
402: fromkey ? sshkey_type(fromkey) : "(ORIGIN)",
403: fromkey ? fp1 : "", user ? user : "(ANY)",
404: sshkey_type(hks->key), fp2);
405: free(fp1);
406: free(fp2);
407: /*
408: * Record the hostnames for the initial forwarding and
409: * the final destination.
410: */
411: hp = NULL;
412: if (i == e->nsession_ids - 1)
413: hp = last_hostnamep;
414: else if (i == 0)
415: hp = forward_hostnamep;
416: /* Special handling for final recorded binding */
417: test_user = NULL;
418: if (i == e->nsession_ids - 1) {
419: /* Can only check user at final hop */
420: test_user = user;
421: /*
422: * user is only presented for signature requests.
423: * If this is the case, make sure last binding is not
424: * for a forwarding.
425: */
426: if (hks->forwarded && user != NULL) {
427: error_f("tried to sign on forwarding hop");
428: return -1;
429: }
430: } else if (!hks->forwarded) {
431: error_f("tried to forward though signing bind");
432: return -1;
433: }
434: if (permitted_by_dest_constraints(fromkey, hks->key, id,
435: test_user, hp) != 0)
436: return -1;
437: fromkey = hks->key;
438: }
439: /*
440: * Another special case: if the last bound session ID was for a
441: * forwarding, and this function is not being called to check a sign
442: * request (i.e. no 'user' supplied), then only permit the key if
443: * there is a permission that would allow it to be used at another
444: * destination. This hides keys that are allowed to be used to
1.284 jsg 445: * authenticate *to* a host but not permitted for *use* beyond it.
1.281 djm 446: */
447: hks = &e->session_ids[e->nsession_ids - 1];
448: if (hks->forwarded && user == NULL &&
449: permitted_by_dest_constraints(hks->key, NULL, id,
450: NULL, NULL) != 0) {
451: debug3_f("key permitted at host but not after");
452: return -1;
453: }
454:
455: /* success */
456: return 0;
457: }
458:
1.33 markus 459: /* return matching private key for given public key */
1.78 provos 460: static Identity *
1.221 djm 461: lookup_identity(struct sshkey *key)
1.33 markus 462: {
1.78 provos 463: Identity *id;
464:
1.221 djm 465: TAILQ_FOREACH(id, &idtab->idlist, next) {
1.194 markus 466: if (sshkey_equal(key, id->key))
1.78 provos 467: return (id);
1.33 markus 468: }
1.78 provos 469: return (NULL);
470: }
471:
1.107 markus 472: /* Check confirmation of keysign request */
473: static int
1.270 djm 474: confirm_key(Identity *id, const char *extra)
1.107 markus 475: {
1.122 djm 476: char *p;
1.107 markus 477: int ret = -1;
478:
1.194 markus 479: p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT);
1.197 djm 480: if (p != NULL &&
1.270 djm 481: ask_permission("Allow use of key %s?\nKey fingerprint %s.%s%s",
482: id->comment, p,
483: extra == NULL ? "" : "\n", extra == NULL ? "" : extra))
1.122 djm 484: ret = 0;
1.173 djm 485: free(p);
1.122 djm 486:
1.107 markus 487: return (ret);
488: }
489:
1.194 markus 490: static void
491: send_status(SocketEntry *e, int success)
492: {
493: int r;
494:
495: if ((r = sshbuf_put_u32(e->output, 1)) != 0 ||
496: (r = sshbuf_put_u8(e->output, success ?
497: SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0)
1.266 djm 498: fatal_fr(r, "compose");
1.194 markus 499: }
500:
1.33 markus 501: /* send list of supported public keys to 'client' */
1.55 itojun 502: static void
1.221 djm 503: process_request_identities(SocketEntry *e)
1.33 markus 504: {
1.96 deraadt 505: Identity *id;
1.281 djm 506: struct sshbuf *msg, *keys;
1.194 markus 507: int r;
1.281 djm 508: u_int nentries = 0;
1.1 deraadt 509:
1.269 djm 510: debug2_f("entering");
511:
1.281 djm 512: if ((msg = sshbuf_new()) == NULL || (keys = sshbuf_new()) == NULL)
1.266 djm 513: fatal_f("sshbuf_new failed");
1.221 djm 514: TAILQ_FOREACH(id, &idtab->idlist, next) {
1.281 djm 515: /* identity not visible, don't include in response */
516: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
517: continue;
518: if ((r = sshkey_puts_opts(id->key, keys,
1.278 djm 519: SSHKEY_SERIALIZE_INFO)) != 0 ||
1.281 djm 520: (r = sshbuf_put_cstring(keys, id->comment)) != 0) {
1.266 djm 521: error_fr(r, "compose key/comment");
1.220 djm 522: continue;
1.33 markus 523: }
1.281 djm 524: nentries++;
1.21 markus 525: }
1.281 djm 526: debug2_f("replying with %u allowed of %u available keys",
527: nentries, idtab->nentries);
528: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
529: (r = sshbuf_put_u32(msg, nentries)) != 0 ||
530: (r = sshbuf_putb(msg, keys)) != 0)
531: fatal_fr(r, "compose");
1.194 markus 532: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 533: fatal_fr(r, "enqueue");
1.194 markus 534: sshbuf_free(msg);
1.281 djm 535: sshbuf_free(keys);
1.1 deraadt 536: }
537:
1.33 markus 538:
1.208 markus 539: static char *
540: agent_decode_alg(struct sshkey *key, u_int flags)
541: {
542: if (key->type == KEY_RSA) {
543: if (flags & SSH_AGENT_RSA_SHA2_256)
544: return "rsa-sha2-256";
545: else if (flags & SSH_AGENT_RSA_SHA2_512)
546: return "rsa-sha2-512";
1.235 djm 547: } else if (key->type == KEY_RSA_CERT) {
548: if (flags & SSH_AGENT_RSA_SHA2_256)
549: return "rsa-sha2-256-cert-v01@openssh.com";
550: else if (flags & SSH_AGENT_RSA_SHA2_512)
551: return "rsa-sha2-512-cert-v01@openssh.com";
1.208 markus 552: }
553: return NULL;
554: }
555:
1.258 djm 556: /*
1.270 djm 557: * Attempt to parse the contents of a buffer as a SSH publickey userauth
558: * request, checking its contents for consistency and matching the embedded
559: * key against the one that is being used for signing.
560: * Note: does not modify msg buffer.
1.282 djm 561: * Optionally extract the username, session ID and/or hostkey from the request.
1.258 djm 562: */
563: static int
1.270 djm 564: parse_userauth_request(struct sshbuf *msg, const struct sshkey *expected_key,
1.282 djm 565: char **userp, struct sshbuf **sess_idp, struct sshkey **hostkeyp)
1.258 djm 566: {
1.270 djm 567: struct sshbuf *b = NULL, *sess_id = NULL;
568: char *user = NULL, *service = NULL, *method = NULL, *pkalg = NULL;
1.258 djm 569: int r;
1.270 djm 570: u_char t, sig_follows;
1.282 djm 571: struct sshkey *mkey = NULL, *hostkey = NULL;
1.258 djm 572:
1.270 djm 573: if (userp != NULL)
574: *userp = NULL;
575: if (sess_idp != NULL)
576: *sess_idp = NULL;
1.282 djm 577: if (hostkeyp != NULL)
578: *hostkeyp = NULL;
1.270 djm 579: if ((b = sshbuf_fromb(msg)) == NULL)
580: fatal_f("sshbuf_fromb");
1.258 djm 581:
582: /* SSH userauth request */
1.270 djm 583: if ((r = sshbuf_froms(b, &sess_id)) != 0)
584: goto out;
585: if (sshbuf_len(sess_id) == 0) {
586: r = SSH_ERR_INVALID_FORMAT;
587: goto out;
588: }
589: if ((r = sshbuf_get_u8(b, &t)) != 0 || /* SSH2_MSG_USERAUTH_REQUEST */
590: (r = sshbuf_get_cstring(b, &user, NULL)) != 0 || /* server user */
591: (r = sshbuf_get_cstring(b, &service, NULL)) != 0 || /* service */
592: (r = sshbuf_get_cstring(b, &method, NULL)) != 0 || /* method */
593: (r = sshbuf_get_u8(b, &sig_follows)) != 0 || /* sig-follows */
594: (r = sshbuf_get_cstring(b, &pkalg, NULL)) != 0 || /* alg */
595: (r = sshkey_froms(b, &mkey)) != 0) /* key */
596: goto out;
597: if (t != SSH2_MSG_USERAUTH_REQUEST ||
598: sig_follows != 1 ||
599: strcmp(service, "ssh-connection") != 0 ||
600: !sshkey_equal(expected_key, mkey) ||
601: sshkey_type_from_name(pkalg) != expected_key->type) {
602: r = SSH_ERR_INVALID_FORMAT;
603: goto out;
604: }
1.282 djm 605: if (strcmp(method, "publickey-hostbound-v00@openssh.com") == 0) {
606: if ((r = sshkey_froms(b, &hostkey)) != 0)
607: goto out;
608: } else if (strcmp(method, "publickey") != 0) {
1.270 djm 609: r = SSH_ERR_INVALID_FORMAT;
610: goto out;
611: }
612: if (sshbuf_len(b) != 0) {
613: r = SSH_ERR_INVALID_FORMAT;
614: goto out;
615: }
616: /* success */
617: r = 0;
618: debug3_f("well formed userauth");
619: if (userp != NULL) {
620: *userp = user;
621: user = NULL;
622: }
623: if (sess_idp != NULL) {
624: *sess_idp = sess_id;
625: sess_id = NULL;
1.258 djm 626: }
1.282 djm 627: if (hostkeyp != NULL) {
628: *hostkeyp = hostkey;
629: hostkey = NULL;
630: }
1.270 djm 631: out:
632: sshbuf_free(b);
633: sshbuf_free(sess_id);
634: free(user);
635: free(service);
636: free(method);
637: free(pkalg);
1.258 djm 638: sshkey_free(mkey);
1.282 djm 639: sshkey_free(hostkey);
1.270 djm 640: return r;
641: }
642:
643: /*
644: * Attempt to parse the contents of a buffer as a SSHSIG signature request.
645: * Note: does not modify buffer.
646: */
647: static int
648: parse_sshsig_request(struct sshbuf *msg)
649: {
650: int r;
651: struct sshbuf *b;
652:
653: if ((b = sshbuf_fromb(msg)) == NULL)
654: fatal_f("sshbuf_fromb");
655:
656: if ((r = sshbuf_cmp(b, 0, "SSHSIG", 6)) != 0 ||
657: (r = sshbuf_consume(b, 6)) != 0 ||
658: (r = sshbuf_get_cstring(b, NULL, NULL)) != 0 || /* namespace */
659: (r = sshbuf_get_string_direct(b, NULL, NULL)) != 0 || /* reserved */
660: (r = sshbuf_get_cstring(b, NULL, NULL)) != 0 || /* hashalg */
661: (r = sshbuf_get_string_direct(b, NULL, NULL)) != 0) /* H(msg) */
662: goto out;
663: if (sshbuf_len(b) != 0) {
664: r = SSH_ERR_INVALID_FORMAT;
665: goto out;
666: }
667: /* success */
668: r = 0;
669: out:
1.258 djm 670: sshbuf_free(b);
1.270 djm 671: return r;
672: }
673:
674: /*
675: * This function inspects a message to be signed by a FIDO key that has a
676: * web-like application string (i.e. one that does not begin with "ssh:".
677: * It checks that the message is one of those expected for SSH operations
678: * (pubkey userauth, sshsig, CA key signing) to exclude signing challenges
679: * for the web.
680: */
681: static int
682: check_websafe_message_contents(struct sshkey *key, struct sshbuf *data)
683: {
1.282 djm 684: if (parse_userauth_request(data, key, NULL, NULL, NULL) == 0) {
1.270 djm 685: debug_f("signed data matches public key userauth request");
1.258 djm 686: return 1;
687: }
1.270 djm 688: if (parse_sshsig_request(data) == 0) {
689: debug_f("signed data matches SSHSIG signature request");
1.258 djm 690: return 1;
1.270 djm 691: }
1.258 djm 692:
1.270 djm 693: /* XXX check CA signature operation */
1.258 djm 694:
695: error("web-origin key attempting to sign non-SSH message");
696: return 0;
697: }
698:
1.280 djm 699: static int
700: buf_equal(const struct sshbuf *a, const struct sshbuf *b)
701: {
702: if (sshbuf_ptr(a) == NULL || sshbuf_ptr(b) == NULL)
703: return SSH_ERR_INVALID_ARGUMENT;
704: if (sshbuf_len(a) != sshbuf_len(b))
705: return SSH_ERR_INVALID_FORMAT;
706: if (timingsafe_bcmp(sshbuf_ptr(a), sshbuf_ptr(b), sshbuf_len(a)) != 0)
707: return SSH_ERR_INVALID_FORMAT;
708: return 0;
709: }
710:
1.33 markus 711: /* ssh2 only */
1.55 itojun 712: static void
1.33 markus 713: process_sign_request2(SocketEntry *e)
714: {
1.221 djm 715: u_char *signature = NULL;
1.281 djm 716: size_t slen = 0;
1.194 markus 717: u_int compat = 0, flags;
1.287 djm 718: int r, ok = -1, retried = 0;
719: char *fp = NULL, *pin = NULL, *prompt = NULL;
720: char *user = NULL, *sig_dest = NULL;
1.281 djm 721: const char *fwd_host = NULL, *dest_host = NULL;
1.280 djm 722: struct sshbuf *msg = NULL, *data = NULL, *sid = NULL;
1.283 djm 723: struct sshkey *key = NULL, *hostkey = NULL;
1.195 djm 724: struct identity *id;
1.251 djm 725: struct notifier_ctx *notifier = NULL;
1.194 markus 726:
1.270 djm 727: debug_f("entering");
728:
1.273 dtucker 729: if ((msg = sshbuf_new()) == NULL || (data = sshbuf_new()) == NULL)
1.266 djm 730: fatal_f("sshbuf_new failed");
1.221 djm 731: if ((r = sshkey_froms(e->request, &key)) != 0 ||
1.270 djm 732: (r = sshbuf_get_stringb(e->request, data)) != 0 ||
1.225 djm 733: (r = sshbuf_get_u32(e->request, &flags)) != 0) {
1.266 djm 734: error_fr(r, "parse");
1.225 djm 735: goto send;
736: }
737:
1.221 djm 738: if ((id = lookup_identity(key)) == NULL) {
1.266 djm 739: verbose_f("%s key not found", sshkey_type(key));
1.195 djm 740: goto send;
741: }
1.281 djm 742: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
743: SSH_FP_DEFAULT)) == NULL)
744: fatal_f("fingerprint failed");
745:
746: if (id->ndest_constraints != 0) {
747: if (e->nsession_ids == 0) {
748: logit_f("refusing use of destination-constrained key "
749: "to sign on unbound connection");
750: goto send;
751: }
1.283 djm 752: if (parse_userauth_request(data, key, &user, &sid,
753: &hostkey) != 0) {
1.281 djm 754: logit_f("refusing use of destination-constrained key "
755: "to sign an unidentified signature");
756: goto send;
757: }
758: /* XXX logspam */
759: debug_f("user=%s", user);
760: if (identity_permitted(id, e, user, &fwd_host, &dest_host) != 0)
761: goto send;
762: /* XXX display fwd_host/dest_host in askpass UI */
1.280 djm 763: /*
1.281 djm 764: * Ensure that the session ID is the most recent one
765: * registered on the socket - it should have been bound by
766: * ssh immediately before userauth.
1.280 djm 767: */
1.281 djm 768: if (buf_equal(sid,
769: e->session_ids[e->nsession_ids - 1].sid) != 0) {
770: error_f("unexpected session ID (%zu listed) on "
771: "signature request for target user %s with "
772: "key %s %s", e->nsession_ids, user,
773: sshkey_type(id->key), fp);
774: goto send;
1.280 djm 775: }
1.283 djm 776: /*
777: * Ensure that the hostkey embedded in the signature matches
778: * the one most recently bound to the socket. An exception is
779: * made for the initial forwarding hop.
780: */
781: if (e->nsession_ids > 1 && hostkey == NULL) {
782: error_f("refusing use of destination-constrained key: "
783: "no hostkey recorded in signature for forwarded "
784: "connection");
785: goto send;
786: }
787: if (hostkey != NULL && !sshkey_equal(hostkey,
788: e->session_ids[e->nsession_ids - 1].key)) {
789: error_f("refusing use of destination-constrained key: "
790: "mismatch between hostkey in request and most "
791: "recently bound session");
792: goto send;
793: }
1.281 djm 794: xasprintf(&sig_dest, "public key authentication request for "
795: "user \"%s\" to listed host", user);
1.280 djm 796: }
797: if (id->confirm && confirm_key(id, sig_dest) != 0) {
1.266 djm 798: verbose_f("user refused key");
1.195 djm 799: goto send;
800: }
1.258 djm 801: if (sshkey_is_sk(id->key)) {
1.292 djm 802: if (restrict_websafe &&
803: strncmp(id->key->sk_application, "ssh:", 4) != 0 &&
1.270 djm 804: !check_websafe_message_contents(key, data)) {
1.258 djm 805: /* error already logged */
806: goto send;
807: }
1.290 djm 808: if (id->key->sk_flags & SSH_SK_USER_PRESENCE_REQD) {
1.258 djm 809: notifier = notify_start(0,
1.280 djm 810: "Confirm user presence for key %s %s%s%s",
811: sshkey_type(id->key), fp,
812: sig_dest == NULL ? "" : "\n",
813: sig_dest == NULL ? "" : sig_dest);
1.258 djm 814: }
1.251 djm 815: }
1.287 djm 816: retry_pin:
1.251 djm 817: if ((r = sshkey_sign(id->key, &signature, &slen,
1.270 djm 818: sshbuf_ptr(data), sshbuf_len(data), agent_decode_alg(key, flags),
1.287 djm 819: id->sk_provider, pin, compat)) != 0) {
820: debug_fr(r, "sshkey_sign");
821: if (pin == NULL && !retried && sshkey_is_sk(id->key) &&
822: r == SSH_ERR_KEY_WRONG_PASSPHRASE) {
1.289 djm 823: notify_complete(notifier, NULL);
824: notifier = NULL;
1.287 djm 825: /* XXX include sig_dest */
826: xasprintf(&prompt, "Enter PIN%sfor %s key %s: ",
827: (id->key->sk_flags & SSH_SK_USER_PRESENCE_REQD) ?
828: " and confirm user presence " : " ",
829: sshkey_type(id->key), fp);
830: pin = read_passphrase(prompt, RP_USE_ASKPASS);
831: retried = 1;
832: goto retry_pin;
833: }
1.266 djm 834: error_fr(r, "sshkey_sign");
1.251 djm 835: goto send;
1.33 markus 836: }
1.195 djm 837: /* Success */
838: ok = 0;
839: send:
1.291 djm 840: debug_f("good signature");
1.267 djm 841: notify_complete(notifier, "User presence confirmed");
1.270 djm 842:
1.33 markus 843: if (ok == 0) {
1.194 markus 844: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
845: (r = sshbuf_put_string(msg, signature, slen)) != 0)
1.266 djm 846: fatal_fr(r, "compose");
1.194 markus 847: } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
1.266 djm 848: fatal_fr(r, "compose failure");
1.194 markus 849:
850: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 851: fatal_fr(r, "enqueue");
1.194 markus 852:
1.280 djm 853: sshbuf_free(sid);
1.270 djm 854: sshbuf_free(data);
1.194 markus 855: sshbuf_free(msg);
1.270 djm 856: sshkey_free(key);
1.283 djm 857: sshkey_free(hostkey);
1.270 djm 858: free(fp);
1.173 djm 859: free(signature);
1.280 djm 860: free(sig_dest);
861: free(user);
1.287 djm 862: free(prompt);
863: if (pin != NULL)
864: freezero(pin, strlen(pin));
1.1 deraadt 865: }
866:
1.33 markus 867: /* shared */
1.55 itojun 868: static void
1.221 djm 869: process_remove_identity(SocketEntry *e)
1.1 deraadt 870: {
1.194 markus 871: int r, success = 0;
872: struct sshkey *key = NULL;
1.221 djm 873: Identity *id;
1.21 markus 874:
1.269 djm 875: debug2_f("entering");
1.221 djm 876: if ((r = sshkey_froms(e->request, &key)) != 0) {
1.266 djm 877: error_fr(r, "parse key");
1.221 djm 878: goto done;
879: }
880: if ((id = lookup_identity(key)) == NULL) {
1.266 djm 881: debug_f("key not found");
1.221 djm 882: goto done;
883: }
1.281 djm 884: /* identity not visible, cannot be removed */
885: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
886: goto done; /* error already logged */
1.221 djm 887: /* We have this key, free it. */
888: if (idtab->nentries < 1)
1.266 djm 889: fatal_f("internal error: nentries %d", idtab->nentries);
1.221 djm 890: TAILQ_REMOVE(&idtab->idlist, id, next);
891: free_identity(id);
892: idtab->nentries--;
893: success = 1;
894: done:
1.276 djm 895: sshkey_free(key);
1.194 markus 896: send_status(e, success);
1.1 deraadt 897: }
898:
1.55 itojun 899: static void
1.221 djm 900: process_remove_all_identities(SocketEntry *e)
1.1 deraadt 901: {
1.78 provos 902: Identity *id;
1.21 markus 903:
1.269 djm 904: debug2_f("entering");
1.21 markus 905: /* Loop over all identities and clear the keys. */
1.221 djm 906: for (id = TAILQ_FIRST(&idtab->idlist); id;
907: id = TAILQ_FIRST(&idtab->idlist)) {
908: TAILQ_REMOVE(&idtab->idlist, id, next);
1.78 provos 909: free_identity(id);
1.21 markus 910: }
911:
912: /* Mark that there are no identities. */
1.221 djm 913: idtab->nentries = 0;
1.21 markus 914:
915: /* Send success. */
1.194 markus 916: send_status(e, 1);
1.1 deraadt 917: }
918:
1.155 dtucker 919: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 920: static time_t
1.89 markus 921: reaper(void)
922: {
1.175 dtucker 923: time_t deadline = 0, now = monotime();
1.89 markus 924: Identity *id, *nxt;
925:
1.221 djm 926: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
927: nxt = TAILQ_NEXT(id, next);
928: if (id->death == 0)
929: continue;
930: if (now >= id->death) {
931: debug("expiring key '%s'", id->comment);
932: TAILQ_REMOVE(&idtab->idlist, id, next);
933: free_identity(id);
934: idtab->nentries--;
935: } else
936: deadline = (deadline == 0) ? id->death :
937: MINIMUM(deadline, id->death);
1.89 markus 938: }
1.155 dtucker 939: if (deadline == 0 || deadline <= now)
940: return 0;
941: else
942: return (deadline - now);
1.89 markus 943: }
944:
1.271 djm 945: static int
1.281 djm 946: parse_dest_constraint_hop(struct sshbuf *b, struct dest_constraint_hop *dch)
947: {
948: u_char key_is_ca;
949: size_t elen = 0;
950: int r;
951: struct sshkey *k = NULL;
952: char *fp;
953:
954: memset(dch, '\0', sizeof(*dch));
955: if ((r = sshbuf_get_cstring(b, &dch->user, NULL)) != 0 ||
956: (r = sshbuf_get_cstring(b, &dch->hostname, NULL)) != 0 ||
957: (r = sshbuf_get_string_direct(b, NULL, &elen)) != 0) {
958: error_fr(r, "parse");
959: goto out;
960: }
961: if (elen != 0) {
962: error_f("unsupported extensions (len %zu)", elen);
963: r = SSH_ERR_FEATURE_UNSUPPORTED;
964: goto out;
965: }
966: if (*dch->hostname == '\0') {
967: free(dch->hostname);
968: dch->hostname = NULL;
969: }
970: if (*dch->user == '\0') {
971: free(dch->user);
972: dch->user = NULL;
973: }
974: while (sshbuf_len(b) != 0) {
975: dch->keys = xrecallocarray(dch->keys, dch->nkeys,
976: dch->nkeys + 1, sizeof(*dch->keys));
977: dch->key_is_ca = xrecallocarray(dch->key_is_ca, dch->nkeys,
978: dch->nkeys + 1, sizeof(*dch->key_is_ca));
979: if ((r = sshkey_froms(b, &k)) != 0 ||
980: (r = sshbuf_get_u8(b, &key_is_ca)) != 0)
981: goto out;
982: if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT,
983: SSH_FP_DEFAULT)) == NULL)
984: fatal_f("fingerprint failed");
985: debug3_f("%s%s%s: adding %skey %s %s",
986: dch->user == NULL ? "" : dch->user,
987: dch->user == NULL ? "" : "@",
988: dch->hostname, key_is_ca ? "CA " : "", sshkey_type(k), fp);
989: free(fp);
990: dch->keys[dch->nkeys] = k;
991: dch->key_is_ca[dch->nkeys] = key_is_ca != 0;
992: dch->nkeys++;
993: k = NULL; /* transferred */
994: }
995: /* success */
996: r = 0;
997: out:
998: sshkey_free(k);
999: return r;
1000: }
1001:
1002: static int
1003: parse_dest_constraint(struct sshbuf *m, struct dest_constraint *dc)
1004: {
1005: struct sshbuf *b = NULL, *frombuf = NULL, *tobuf = NULL;
1006: int r;
1007: size_t elen = 0;
1008:
1009: debug3_f("entering");
1010:
1011: memset(dc, '\0', sizeof(*dc));
1012: if ((r = sshbuf_froms(m, &b)) != 0 ||
1013: (r = sshbuf_froms(b, &frombuf)) != 0 ||
1014: (r = sshbuf_froms(b, &tobuf)) != 0 ||
1015: (r = sshbuf_get_string_direct(b, NULL, &elen)) != 0) {
1016: error_fr(r, "parse");
1017: goto out;
1018: }
1.297 jcs 1019: if ((r = parse_dest_constraint_hop(frombuf, &dc->from)) != 0 ||
1020: (r = parse_dest_constraint_hop(tobuf, &dc->to)) != 0)
1.281 djm 1021: goto out; /* already logged */
1022: if (elen != 0) {
1023: error_f("unsupported extensions (len %zu)", elen);
1024: r = SSH_ERR_FEATURE_UNSUPPORTED;
1025: goto out;
1026: }
1027: debug2_f("parsed %s (%u keys) > %s%s%s (%u keys)",
1028: dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc->from.nkeys,
1029: dc->to.user ? dc->to.user : "", dc->to.user ? "@" : "",
1030: dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys);
1031: /* check consistency */
1032: if ((dc->from.hostname == NULL) != (dc->from.nkeys == 0) ||
1033: dc->from.user != NULL) {
1034: error_f("inconsistent \"from\" specification");
1035: r = SSH_ERR_INVALID_FORMAT;
1036: goto out;
1037: }
1038: if (dc->to.hostname == NULL || dc->to.nkeys == 0) {
1039: error_f("incomplete \"to\" specification");
1040: r = SSH_ERR_INVALID_FORMAT;
1041: goto out;
1042: }
1043: /* success */
1044: r = 0;
1045: out:
1046: sshbuf_free(b);
1047: sshbuf_free(frombuf);
1048: sshbuf_free(tobuf);
1049: return r;
1050: }
1051:
1052: static int
1053: parse_key_constraint_extension(struct sshbuf *m, char **sk_providerp,
1054: struct dest_constraint **dcsp, size_t *ndcsp)
1.277 djm 1055: {
1056: char *ext_name = NULL;
1057: int r;
1.281 djm 1058: struct sshbuf *b = NULL;
1.277 djm 1059:
1060: if ((r = sshbuf_get_cstring(m, &ext_name, NULL)) != 0) {
1061: error_fr(r, "parse constraint extension");
1062: goto out;
1063: }
1064: debug_f("constraint ext %s", ext_name);
1065: if (strcmp(ext_name, "sk-provider@openssh.com") == 0) {
1066: if (sk_providerp == NULL) {
1067: error_f("%s not valid here", ext_name);
1068: r = SSH_ERR_INVALID_FORMAT;
1069: goto out;
1070: }
1071: if (*sk_providerp != NULL) {
1072: error_f("%s already set", ext_name);
1073: r = SSH_ERR_INVALID_FORMAT;
1074: goto out;
1075: }
1076: if ((r = sshbuf_get_cstring(m, sk_providerp, NULL)) != 0) {
1077: error_fr(r, "parse %s", ext_name);
1078: goto out;
1079: }
1.281 djm 1080: } else if (strcmp(ext_name,
1081: "restrict-destination-v00@openssh.com") == 0) {
1082: if (*dcsp != NULL) {
1083: error_f("%s already set", ext_name);
1084: goto out;
1085: }
1086: if ((r = sshbuf_froms(m, &b)) != 0) {
1087: error_fr(r, "parse %s outer", ext_name);
1088: goto out;
1089: }
1090: while (sshbuf_len(b) != 0) {
1091: if (*ndcsp >= AGENT_MAX_DEST_CONSTRAINTS) {
1092: error_f("too many %s constraints", ext_name);
1093: goto out;
1094: }
1095: *dcsp = xrecallocarray(*dcsp, *ndcsp, *ndcsp + 1,
1096: sizeof(**dcsp));
1097: if ((r = parse_dest_constraint(b,
1098: *dcsp + (*ndcsp)++)) != 0)
1099: goto out; /* error already logged */
1100: }
1.277 djm 1101: } else {
1102: error_f("unsupported constraint \"%s\"", ext_name);
1103: r = SSH_ERR_FEATURE_UNSUPPORTED;
1104: goto out;
1105: }
1106: /* success */
1107: r = 0;
1108: out:
1109: free(ext_name);
1.281 djm 1110: sshbuf_free(b);
1.277 djm 1111: return r;
1112: }
1113:
1114: static int
1.271 djm 1115: parse_key_constraints(struct sshbuf *m, struct sshkey *k, time_t *deathp,
1.281 djm 1116: u_int *secondsp, int *confirmp, char **sk_providerp,
1117: struct dest_constraint **dcsp, size_t *ndcsp)
1.1 deraadt 1118: {
1.194 markus 1119: u_char ctype;
1.271 djm 1120: int r;
1121: u_int seconds, maxsign = 0;
1.33 markus 1122:
1.271 djm 1123: while (sshbuf_len(m)) {
1124: if ((r = sshbuf_get_u8(m, &ctype)) != 0) {
1.266 djm 1125: error_fr(r, "parse constraint type");
1.277 djm 1126: goto out;
1.194 markus 1127: }
1128: switch (ctype) {
1.94 markus 1129: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.271 djm 1130: if (*deathp != 0) {
1131: error_f("lifetime already set");
1.277 djm 1132: r = SSH_ERR_INVALID_FORMAT;
1133: goto out;
1.271 djm 1134: }
1135: if ((r = sshbuf_get_u32(m, &seconds)) != 0) {
1.266 djm 1136: error_fr(r, "parse lifetime constraint");
1.277 djm 1137: goto out;
1.194 markus 1138: }
1.271 djm 1139: *deathp = monotime() + seconds;
1140: *secondsp = seconds;
1.94 markus 1141: break;
1.107 markus 1142: case SSH_AGENT_CONSTRAIN_CONFIRM:
1.271 djm 1143: if (*confirmp != 0) {
1144: error_f("confirm already set");
1.277 djm 1145: r = SSH_ERR_INVALID_FORMAT;
1146: goto out;
1.271 djm 1147: }
1148: *confirmp = 1;
1.107 markus 1149: break;
1.228 markus 1150: case SSH_AGENT_CONSTRAIN_MAXSIGN:
1.271 djm 1151: if (k == NULL) {
1152: error_f("maxsign not valid here");
1.277 djm 1153: r = SSH_ERR_INVALID_FORMAT;
1154: goto out;
1.271 djm 1155: }
1156: if (maxsign != 0) {
1157: error_f("maxsign already set");
1.277 djm 1158: r = SSH_ERR_INVALID_FORMAT;
1159: goto out;
1.271 djm 1160: }
1161: if ((r = sshbuf_get_u32(m, &maxsign)) != 0) {
1.266 djm 1162: error_fr(r, "parse maxsign constraint");
1.277 djm 1163: goto out;
1.228 markus 1164: }
1165: if ((r = sshkey_enable_maxsign(k, maxsign)) != 0) {
1.266 djm 1166: error_fr(r, "enable maxsign");
1.277 djm 1167: goto out;
1.228 markus 1168: }
1169: break;
1.238 djm 1170: case SSH_AGENT_CONSTRAIN_EXTENSION:
1.277 djm 1171: if ((r = parse_key_constraint_extension(m,
1.281 djm 1172: sk_providerp, dcsp, ndcsp)) != 0)
1.277 djm 1173: goto out; /* error already logged */
1.238 djm 1174: break;
1.94 markus 1175: default:
1.266 djm 1176: error_f("Unknown constraint %d", ctype);
1.277 djm 1177: r = SSH_ERR_FEATURE_UNSUPPORTED;
1178: goto out;
1.94 markus 1179: }
1180: }
1.271 djm 1181: /* success */
1.277 djm 1182: r = 0;
1183: out:
1184: return r;
1.271 djm 1185: }
1186:
1187: static void
1188: process_add_identity(SocketEntry *e)
1189: {
1190: Identity *id;
1191: int success = 0, confirm = 0;
1.272 dtucker 1192: char *fp, *comment = NULL, *sk_provider = NULL;
1.271 djm 1193: char canonical_provider[PATH_MAX];
1194: time_t death = 0;
1195: u_int seconds = 0;
1.281 djm 1196: struct dest_constraint *dest_constraints = NULL;
1197: size_t ndest_constraints = 0;
1.271 djm 1198: struct sshkey *k = NULL;
1199: int r = SSH_ERR_INTERNAL_ERROR;
1200:
1201: debug2_f("entering");
1202: if ((r = sshkey_private_deserialize(e->request, &k)) != 0 ||
1203: k == NULL ||
1204: (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
1205: error_fr(r, "parse");
1206: goto out;
1207: }
1208: if (parse_key_constraints(e->request, k, &death, &seconds, &confirm,
1.281 djm 1209: &sk_provider, &dest_constraints, &ndest_constraints) != 0) {
1.271 djm 1210: error_f("failed to parse constraints");
1211: sshbuf_reset(e->request);
1212: goto out;
1213: }
1214:
1.238 djm 1215: if (sk_provider != NULL) {
1.240 markus 1216: if (!sshkey_is_sk(k)) {
1.255 naddy 1217: error("Cannot add provider: %s is not an "
1218: "authenticator-hosted key", sshkey_type(k));
1.271 djm 1219: goto out;
1.238 djm 1220: }
1.254 djm 1221: if (strcasecmp(sk_provider, "internal") == 0) {
1.266 djm 1222: debug_f("internal provider");
1.254 djm 1223: } else {
1.297.4.1! bluhm 1224: if (e->nsession_ids != 0 && !remote_add_provider) {
! 1225: verbose("failed add of SK provider \"%.100s\": "
! 1226: "remote addition of providers is disabled",
! 1227: sk_provider);
! 1228: goto out;
! 1229: }
1.254 djm 1230: if (realpath(sk_provider, canonical_provider) == NULL) {
1231: verbose("failed provider \"%.100s\": "
1232: "realpath: %s", sk_provider,
1233: strerror(errno));
1.271 djm 1234: goto out;
1.254 djm 1235: }
1.238 djm 1236: free(sk_provider);
1.254 djm 1237: sk_provider = xstrdup(canonical_provider);
1238: if (match_pattern_list(sk_provider,
1.260 djm 1239: allowed_providers, 0) != 1) {
1.254 djm 1240: error("Refusing add key: "
1.260 djm 1241: "provider %s not allowed", sk_provider);
1.271 djm 1242: goto out;
1.254 djm 1243: }
1.238 djm 1244: }
1.242 markus 1245: }
1246: if ((r = sshkey_shield_private(k)) != 0) {
1.266 djm 1247: error_fr(r, "shield private");
1.271 djm 1248: goto out;
1.238 djm 1249: }
1.106 marc 1250: if (lifetime && !death)
1.175 dtucker 1251: death = monotime() + lifetime;
1.221 djm 1252: if ((id = lookup_identity(k)) == NULL) {
1.163 markus 1253: id = xcalloc(1, sizeof(Identity));
1.221 djm 1254: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1.33 markus 1255: /* Increment the number of identities. */
1.221 djm 1256: idtab->nentries++;
1.33 markus 1257: } else {
1.281 djm 1258: /* identity not visible, do not update */
1259: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
1260: goto out; /* error already logged */
1.228 markus 1261: /* key state might have been updated */
1262: sshkey_free(id->key);
1.173 djm 1263: free(id->comment);
1.238 djm 1264: free(id->sk_provider);
1.281 djm 1265: free_dest_constraints(id->dest_constraints,
1266: id->ndest_constraints);
1.33 markus 1267: }
1.271 djm 1268: /* success */
1.228 markus 1269: id->key = k;
1.157 canacar 1270: id->comment = comment;
1271: id->death = death;
1272: id->confirm = confirm;
1.238 djm 1273: id->sk_provider = sk_provider;
1.281 djm 1274: id->dest_constraints = dest_constraints;
1275: id->ndest_constraints = ndest_constraints;
1.238 djm 1276:
1277: if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT,
1278: SSH_FP_DEFAULT)) == NULL)
1.266 djm 1279: fatal_f("sshkey_fingerprint failed");
1280: debug_f("add %s %s \"%.100s\" (life: %u) (confirm: %u) "
1.281 djm 1281: "(provider: %s) (destination constraints: %zu)",
1282: sshkey_ssh_name(k), fp, comment, seconds, confirm,
1283: sk_provider == NULL ? "none" : sk_provider, ndest_constraints);
1.238 djm 1284: free(fp);
1.271 djm 1285: /* transferred */
1286: k = NULL;
1287: comment = NULL;
1288: sk_provider = NULL;
1.281 djm 1289: dest_constraints = NULL;
1290: ndest_constraints = 0;
1.271 djm 1291: success = 1;
1292: out:
1293: free(sk_provider);
1294: free(comment);
1295: sshkey_free(k);
1.281 djm 1296: free_dest_constraints(dest_constraints, ndest_constraints);
1.194 markus 1297: send_status(e, success);
1.1 deraadt 1298: }
1299:
1.88 markus 1300: /* XXX todo: encrypt sensitive data with passphrase */
1301: static void
1302: process_lock_agent(SocketEntry *e, int lock)
1303: {
1.203 dtucker 1304: int r, success = 0, delay;
1.213 djm 1305: char *passwd;
1306: u_char passwdhash[LOCK_SIZE];
1.203 dtucker 1307: static u_int fail_count = 0;
1308: size_t pwlen;
1309:
1.269 djm 1310: debug2_f("entering");
1.226 djm 1311: /*
1312: * This is deliberately fatal: the user has requested that we lock,
1313: * but we can't parse their request properly. The only safe thing to
1314: * do is abort.
1315: */
1.203 dtucker 1316: if ((r = sshbuf_get_cstring(e->request, &passwd, &pwlen)) != 0)
1.266 djm 1317: fatal_fr(r, "parse");
1.203 dtucker 1318: if (pwlen == 0) {
1319: debug("empty password not supported");
1320: } else if (locked && !lock) {
1321: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1322: passwdhash, sizeof(passwdhash), LOCK_ROUNDS) < 0)
1323: fatal("bcrypt_pbkdf");
1.213 djm 1324: if (timingsafe_bcmp(passwdhash, lock_pwhash, LOCK_SIZE) == 0) {
1.203 dtucker 1325: debug("agent unlocked");
1326: locked = 0;
1327: fail_count = 0;
1.213 djm 1328: explicit_bzero(lock_pwhash, sizeof(lock_pwhash));
1.203 dtucker 1329: success = 1;
1330: } else {
1331: /* delay in 0.1s increments up to 10s */
1332: if (fail_count < 100)
1333: fail_count++;
1334: delay = 100000 * fail_count;
1335: debug("unlock failed, delaying %0.1lf seconds",
1336: (double)delay/1000000);
1337: usleep(delay);
1338: }
1339: explicit_bzero(passwdhash, sizeof(passwdhash));
1.88 markus 1340: } else if (!locked && lock) {
1.203 dtucker 1341: debug("agent locked");
1.88 markus 1342: locked = 1;
1.203 dtucker 1343: arc4random_buf(lock_salt, sizeof(lock_salt));
1344: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1.213 djm 1345: lock_pwhash, sizeof(lock_pwhash), LOCK_ROUNDS) < 0)
1.203 dtucker 1346: fatal("bcrypt_pbkdf");
1.88 markus 1347: success = 1;
1348: }
1.256 jsg 1349: freezero(passwd, pwlen);
1.194 markus 1350: send_status(e, success);
1.88 markus 1351: }
1352:
1353: static void
1.221 djm 1354: no_identities(SocketEntry *e)
1.88 markus 1355: {
1.194 markus 1356: struct sshbuf *msg;
1357: int r;
1.88 markus 1358:
1.194 markus 1359: if ((msg = sshbuf_new()) == NULL)
1.266 djm 1360: fatal_f("sshbuf_new failed");
1.221 djm 1361: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
1.194 markus 1362: (r = sshbuf_put_u32(msg, 0)) != 0 ||
1363: (r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 1364: fatal_fr(r, "compose");
1.194 markus 1365: sshbuf_free(msg);
1.88 markus 1366: }
1.59 markus 1367:
1.163 markus 1368: #ifdef ENABLE_PKCS11
1.59 markus 1369: static void
1.158 djm 1370: process_add_smartcard_key(SocketEntry *e)
1.59 markus 1371: {
1.226 djm 1372: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.253 djm 1373: char **comments = NULL;
1.221 djm 1374: int r, i, count = 0, success = 0, confirm = 0;
1.271 djm 1375: u_int seconds = 0;
1.174 dtucker 1376: time_t death = 0;
1.194 markus 1377: struct sshkey **keys = NULL, *k;
1.84 markus 1378: Identity *id;
1.281 djm 1379: struct dest_constraint *dest_constraints = NULL;
1380: size_t ndest_constraints = 0;
1.75 deraadt 1381:
1.269 djm 1382: debug2_f("entering");
1.194 markus 1383: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
1.226 djm 1384: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) {
1.266 djm 1385: error_fr(r, "parse");
1.226 djm 1386: goto send;
1387: }
1.271 djm 1388: if (parse_key_constraints(e->request, NULL, &death, &seconds, &confirm,
1.281 djm 1389: NULL, &dest_constraints, &ndest_constraints) != 0) {
1.271 djm 1390: error_f("failed to parse constraints");
1391: goto send;
1.110 djm 1392: }
1.297.4.1! bluhm 1393: if (e->nsession_ids != 0 && !remote_add_provider) {
! 1394: verbose("failed PKCS#11 add of \"%.100s\": remote addition of "
! 1395: "providers is disabled", provider);
! 1396: goto send;
! 1397: }
1.215 djm 1398: if (realpath(provider, canonical_provider) == NULL) {
1399: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
1400: provider, strerror(errno));
1401: goto send;
1402: }
1.260 djm 1403: if (match_pattern_list(canonical_provider, allowed_providers, 0) != 1) {
1.215 djm 1404: verbose("refusing PKCS#11 add of \"%.100s\": "
1.260 djm 1405: "provider not allowed", canonical_provider);
1.215 djm 1406: goto send;
1407: }
1.266 djm 1408: debug_f("add %.100s", canonical_provider);
1.110 djm 1409: if (lifetime && !death)
1.175 dtucker 1410: death = monotime() + lifetime;
1.110 djm 1411:
1.253 djm 1412: count = pkcs11_add_provider(canonical_provider, pin, &keys, &comments);
1.163 markus 1413: for (i = 0; i < count; i++) {
1.84 markus 1414: k = keys[i];
1.221 djm 1415: if (lookup_identity(k) == NULL) {
1.163 markus 1416: id = xcalloc(1, sizeof(Identity));
1.84 markus 1417: id->key = k;
1.253 djm 1418: keys[i] = NULL; /* transferred */
1.215 djm 1419: id->provider = xstrdup(canonical_provider);
1.253 djm 1420: if (*comments[i] != '\0') {
1421: id->comment = comments[i];
1422: comments[i] = NULL; /* transferred */
1423: } else {
1424: id->comment = xstrdup(canonical_provider);
1425: }
1.110 djm 1426: id->death = death;
1427: id->confirm = confirm;
1.281 djm 1428: id->dest_constraints = dest_constraints;
1429: id->ndest_constraints = ndest_constraints;
1430: dest_constraints = NULL; /* transferred */
1431: ndest_constraints = 0;
1.221 djm 1432: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1433: idtab->nentries++;
1.84 markus 1434: success = 1;
1435: }
1.271 djm 1436: /* XXX update constraints for existing keys */
1.253 djm 1437: sshkey_free(keys[i]);
1438: free(comments[i]);
1.59 markus 1439: }
1440: send:
1.173 djm 1441: free(pin);
1442: free(provider);
1443: free(keys);
1.253 djm 1444: free(comments);
1.281 djm 1445: free_dest_constraints(dest_constraints, ndest_constraints);
1.194 markus 1446: send_status(e, success);
1.59 markus 1447: }
1448:
1449: static void
1450: process_remove_smartcard_key(SocketEntry *e)
1451: {
1.217 djm 1452: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.221 djm 1453: int r, success = 0;
1.163 markus 1454: Identity *id, *nxt;
1.59 markus 1455:
1.269 djm 1456: debug2_f("entering");
1.194 markus 1457: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
1.226 djm 1458: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) {
1.266 djm 1459: error_fr(r, "parse");
1.226 djm 1460: goto send;
1461: }
1.173 djm 1462: free(pin);
1.59 markus 1463:
1.217 djm 1464: if (realpath(provider, canonical_provider) == NULL) {
1465: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
1466: provider, strerror(errno));
1467: goto send;
1468: }
1469:
1.266 djm 1470: debug_f("remove %.100s", canonical_provider);
1.221 djm 1471: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
1472: nxt = TAILQ_NEXT(id, next);
1473: /* Skip file--based keys */
1474: if (id->provider == NULL)
1475: continue;
1476: if (!strcmp(canonical_provider, id->provider)) {
1477: TAILQ_REMOVE(&idtab->idlist, id, next);
1478: free_identity(id);
1479: idtab->nentries--;
1.59 markus 1480: }
1481: }
1.217 djm 1482: if (pkcs11_del_provider(canonical_provider) == 0)
1.163 markus 1483: success = 1;
1484: else
1.266 djm 1485: error_f("pkcs11_del_provider failed");
1.218 deraadt 1486: send:
1.173 djm 1487: free(provider);
1.194 markus 1488: send_status(e, success);
1.59 markus 1489: }
1.163 markus 1490: #endif /* ENABLE_PKCS11 */
1.59 markus 1491:
1.280 djm 1492: static int
1493: process_ext_session_bind(SocketEntry *e)
1494: {
1495: int r, sid_match, key_match;
1496: struct sshkey *key = NULL;
1497: struct sshbuf *sid = NULL, *sig = NULL;
1498: char *fp = NULL;
1499: size_t i;
1.281 djm 1500: u_char fwd = 0;
1.280 djm 1501:
1502: debug2_f("entering");
1503: if ((r = sshkey_froms(e->request, &key)) != 0 ||
1504: (r = sshbuf_froms(e->request, &sid)) != 0 ||
1505: (r = sshbuf_froms(e->request, &sig)) != 0 ||
1506: (r = sshbuf_get_u8(e->request, &fwd)) != 0) {
1507: error_fr(r, "parse");
1508: goto out;
1509: }
1510: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
1511: SSH_FP_DEFAULT)) == NULL)
1512: fatal_f("fingerprint failed");
1513: /* check signature with hostkey on session ID */
1514: if ((r = sshkey_verify(key, sshbuf_ptr(sig), sshbuf_len(sig),
1515: sshbuf_ptr(sid), sshbuf_len(sid), NULL, 0, NULL)) != 0) {
1516: error_fr(r, "sshkey_verify for %s %s", sshkey_type(key), fp);
1517: goto out;
1518: }
1519: /* check whether sid/key already recorded */
1520: for (i = 0; i < e->nsession_ids; i++) {
1.281 djm 1521: if (!e->session_ids[i].forwarded) {
1522: error_f("attempt to bind session ID to socket "
1523: "previously bound for authentication attempt");
1524: r = -1;
1525: goto out;
1526: }
1.280 djm 1527: sid_match = buf_equal(sid, e->session_ids[i].sid) == 0;
1528: key_match = sshkey_equal(key, e->session_ids[i].key);
1529: if (sid_match && key_match) {
1530: debug_f("session ID already recorded for %s %s",
1531: sshkey_type(key), fp);
1532: r = 0;
1533: goto out;
1534: } else if (sid_match) {
1535: error_f("session ID recorded against different key "
1536: "for %s %s", sshkey_type(key), fp);
1537: r = -1;
1538: goto out;
1539: }
1540: /*
1541: * new sid with previously-seen key can happen, e.g. multiple
1542: * connections to the same host.
1543: */
1544: }
1545: /* record new key/sid */
1546: if (e->nsession_ids >= AGENT_MAX_SESSION_IDS) {
1547: error_f("too many session IDs recorded");
1548: goto out;
1549: }
1550: e->session_ids = xrecallocarray(e->session_ids, e->nsession_ids,
1551: e->nsession_ids + 1, sizeof(*e->session_ids));
1552: i = e->nsession_ids++;
1553: debug_f("recorded %s %s (slot %zu of %d)", sshkey_type(key), fp, i,
1554: AGENT_MAX_SESSION_IDS);
1555: e->session_ids[i].key = key;
1556: e->session_ids[i].forwarded = fwd != 0;
1557: key = NULL; /* transferred */
1558: /* can't transfer sid; it's refcounted and scoped to request's life */
1559: if ((e->session_ids[i].sid = sshbuf_new()) == NULL)
1560: fatal_f("sshbuf_new");
1561: if ((r = sshbuf_putb(e->session_ids[i].sid, sid)) != 0)
1562: fatal_fr(r, "sshbuf_putb session ID");
1563: /* success */
1564: r = 0;
1565: out:
1.288 djm 1566: free(fp);
1.280 djm 1567: sshkey_free(key);
1568: sshbuf_free(sid);
1569: sshbuf_free(sig);
1570: return r == 0 ? 1 : 0;
1571: }
1572:
1573: static void
1574: process_extension(SocketEntry *e)
1575: {
1576: int r, success = 0;
1577: char *name;
1578:
1579: debug2_f("entering");
1580: if ((r = sshbuf_get_cstring(e->request, &name, NULL)) != 0) {
1581: error_fr(r, "parse");
1582: goto send;
1583: }
1584: if (strcmp(name, "session-bind@openssh.com") == 0)
1585: success = process_ext_session_bind(e);
1586: else
1587: debug_f("unsupported extension \"%s\"", name);
1.285 djm 1588: free(name);
1.280 djm 1589: send:
1590: send_status(e, success);
1591: }
1.264 djm 1592: /*
1593: * dispatch incoming message.
1594: * returns 1 on success, 0 for incomplete messages or -1 on error.
1595: */
1.223 djm 1596: static int
1597: process_message(u_int socknum)
1.1 deraadt 1598: {
1.194 markus 1599: u_int msg_len;
1600: u_char type;
1601: const u_char *cp;
1602: int r;
1.223 djm 1603: SocketEntry *e;
1604:
1.266 djm 1605: if (socknum >= sockets_alloc)
1606: fatal_f("sock %u >= allocated %u", socknum, sockets_alloc);
1.223 djm 1607: e = &sockets[socknum];
1.89 markus 1608:
1.194 markus 1609: if (sshbuf_len(e->input) < 5)
1.223 djm 1610: return 0; /* Incomplete message header. */
1.194 markus 1611: cp = sshbuf_ptr(e->input);
1612: msg_len = PEEK_U32(cp);
1.223 djm 1613: if (msg_len > AGENT_MAX_LEN) {
1.266 djm 1614: debug_f("socket %u (fd=%d) message too long %u > %u",
1615: socknum, e->fd, msg_len, AGENT_MAX_LEN);
1.223 djm 1616: return -1;
1.21 markus 1617: }
1.194 markus 1618: if (sshbuf_len(e->input) < msg_len + 4)
1.223 djm 1619: return 0; /* Incomplete message body. */
1.87 markus 1620:
1621: /* move the current input to e->request */
1.194 markus 1622: sshbuf_reset(e->request);
1623: if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
1.223 djm 1624: (r = sshbuf_get_u8(e->request, &type)) != 0) {
1625: if (r == SSH_ERR_MESSAGE_INCOMPLETE ||
1626: r == SSH_ERR_STRING_TOO_LARGE) {
1.266 djm 1627: error_fr(r, "parse");
1.223 djm 1628: return -1;
1629: }
1.266 djm 1630: fatal_fr(r, "parse");
1.223 djm 1631: }
1632:
1.266 djm 1633: debug_f("socket %u (fd=%d) type %d", socknum, e->fd, type);
1.21 markus 1634:
1.230 djm 1635: /* check whether agent is locked */
1.88 markus 1636: if (locked && type != SSH_AGENTC_UNLOCK) {
1.194 markus 1637: sshbuf_reset(e->request);
1.88 markus 1638: switch (type) {
1639: case SSH2_AGENTC_REQUEST_IDENTITIES:
1640: /* send empty lists */
1.221 djm 1641: no_identities(e);
1.88 markus 1642: break;
1643: default:
1644: /* send a fail message for all other request types */
1.194 markus 1645: send_status(e, 0);
1.88 markus 1646: }
1.264 djm 1647: return 1;
1.88 markus 1648: }
1649:
1.21 markus 1650: switch (type) {
1.88 markus 1651: case SSH_AGENTC_LOCK:
1652: case SSH_AGENTC_UNLOCK:
1653: process_lock_agent(e, type == SSH_AGENTC_LOCK);
1654: break;
1.21 markus 1655: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.221 djm 1656: process_remove_all_identities(e); /* safe for !WITH_SSH1 */
1.33 markus 1657: break;
1658: /* ssh2 */
1659: case SSH2_AGENTC_SIGN_REQUEST:
1660: process_sign_request2(e);
1661: break;
1662: case SSH2_AGENTC_REQUEST_IDENTITIES:
1.221 djm 1663: process_request_identities(e);
1.33 markus 1664: break;
1665: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 1666: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.221 djm 1667: process_add_identity(e);
1.33 markus 1668: break;
1669: case SSH2_AGENTC_REMOVE_IDENTITY:
1.221 djm 1670: process_remove_identity(e);
1.33 markus 1671: break;
1672: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
1.221 djm 1673: process_remove_all_identities(e);
1.21 markus 1674: break;
1.163 markus 1675: #ifdef ENABLE_PKCS11
1.59 markus 1676: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 1677: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 1678: process_add_smartcard_key(e);
1.75 deraadt 1679: break;
1.59 markus 1680: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
1681: process_remove_smartcard_key(e);
1.75 deraadt 1682: break;
1.163 markus 1683: #endif /* ENABLE_PKCS11 */
1.280 djm 1684: case SSH_AGENTC_EXTENSION:
1685: process_extension(e);
1686: break;
1.21 markus 1687: default:
1688: /* Unknown message. Respond with failure. */
1689: error("Unknown message %d", type);
1.194 markus 1690: sshbuf_reset(e->request);
1691: send_status(e, 0);
1.21 markus 1692: break;
1693: }
1.264 djm 1694: return 1;
1.1 deraadt 1695: }
1696:
1.55 itojun 1697: static void
1.73 stevesk 1698: new_socket(sock_type type, int fd)
1.1 deraadt 1699: {
1.112 markus 1700: u_int i, old_alloc, new_alloc;
1.96 deraadt 1701:
1.269 djm 1702: debug_f("type = %s", type == AUTH_CONNECTION ? "CONNECTION" :
1703: (type == AUTH_SOCKET ? "SOCKET" : "UNKNOWN"));
1.119 djm 1704: set_nonblock(fd);
1.21 markus 1705:
1706: if (fd > max_fd)
1707: max_fd = fd;
1708:
1709: for (i = 0; i < sockets_alloc; i++)
1710: if (sockets[i].type == AUTH_UNUSED) {
1711: sockets[i].fd = fd;
1.266 djm 1712: if ((sockets[i].input = sshbuf_new()) == NULL ||
1713: (sockets[i].output = sshbuf_new()) == NULL ||
1714: (sockets[i].request = sshbuf_new()) == NULL)
1715: fatal_f("sshbuf_new failed");
1.112 markus 1716: sockets[i].type = type;
1.21 markus 1717: return;
1718: }
1719: old_alloc = sockets_alloc;
1.112 markus 1720: new_alloc = sockets_alloc + 10;
1.269 djm 1721: sockets = xrecallocarray(sockets, old_alloc, new_alloc,
1722: sizeof(sockets[0]));
1.112 markus 1723: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 1724: sockets[i].type = AUTH_UNUSED;
1.112 markus 1725: sockets_alloc = new_alloc;
1.21 markus 1726: sockets[old_alloc].fd = fd;
1.266 djm 1727: if ((sockets[old_alloc].input = sshbuf_new()) == NULL ||
1728: (sockets[old_alloc].output = sshbuf_new()) == NULL ||
1729: (sockets[old_alloc].request = sshbuf_new()) == NULL)
1730: fatal_f("sshbuf_new failed");
1.112 markus 1731: sockets[old_alloc].type = type;
1.1 deraadt 1732: }
1733:
1.55 itojun 1734: static int
1.223 djm 1735: handle_socket_read(u_int socknum)
1.1 deraadt 1736: {
1.223 djm 1737: struct sockaddr_un sunaddr;
1738: socklen_t slen;
1739: uid_t euid;
1740: gid_t egid;
1741: int fd;
1742:
1743: slen = sizeof(sunaddr);
1744: fd = accept(sockets[socknum].fd, (struct sockaddr *)&sunaddr, &slen);
1.237 deraadt 1745: if (fd == -1) {
1.223 djm 1746: error("accept from AUTH_SOCKET: %s", strerror(errno));
1747: return -1;
1748: }
1.237 deraadt 1749: if (getpeereid(fd, &euid, &egid) == -1) {
1.223 djm 1750: error("getpeereid %d failed: %s", fd, strerror(errno));
1751: close(fd);
1752: return -1;
1753: }
1754: if ((euid != 0) && (getuid() != euid)) {
1755: error("uid mismatch: peer euid %u != uid %u",
1756: (u_int) euid, (u_int) getuid());
1757: close(fd);
1758: return -1;
1759: }
1760: new_socket(AUTH_CONNECTION, fd);
1761: return 0;
1762: }
1763:
1764: static int
1765: handle_conn_read(u_int socknum)
1766: {
1.233 djm 1767: char buf[AGENT_RBUF_LEN];
1.223 djm 1768: ssize_t len;
1769: int r;
1770:
1771: if ((len = read(sockets[socknum].fd, buf, sizeof(buf))) <= 0) {
1772: if (len == -1) {
1773: if (errno == EAGAIN || errno == EINTR)
1774: return 0;
1.266 djm 1775: error_f("read error on socket %u (fd %d): %s",
1776: socknum, sockets[socknum].fd, strerror(errno));
1.223 djm 1777: }
1778: return -1;
1779: }
1780: if ((r = sshbuf_put(sockets[socknum].input, buf, len)) != 0)
1.266 djm 1781: fatal_fr(r, "compose");
1.223 djm 1782: explicit_bzero(buf, sizeof(buf));
1.264 djm 1783: for (;;) {
1784: if ((r = process_message(socknum)) == -1)
1785: return -1;
1786: else if (r == 0)
1787: break;
1788: }
1.223 djm 1789: return 0;
1790: }
1791:
1792: static int
1793: handle_conn_write(u_int socknum)
1794: {
1795: ssize_t len;
1796: int r;
1797:
1798: if (sshbuf_len(sockets[socknum].output) == 0)
1799: return 0; /* shouldn't happen */
1800: if ((len = write(sockets[socknum].fd,
1801: sshbuf_ptr(sockets[socknum].output),
1802: sshbuf_len(sockets[socknum].output))) <= 0) {
1803: if (len == -1) {
1804: if (errno == EAGAIN || errno == EINTR)
1805: return 0;
1.266 djm 1806: error_f("read error on socket %u (fd %d): %s",
1807: socknum, sockets[socknum].fd, strerror(errno));
1.223 djm 1808: }
1809: return -1;
1810: }
1811: if ((r = sshbuf_consume(sockets[socknum].output, len)) != 0)
1.266 djm 1812: fatal_fr(r, "consume");
1.223 djm 1813: return 0;
1814: }
1815:
1816: static void
1.231 djm 1817: after_poll(struct pollfd *pfd, size_t npfd, u_int maxfds)
1.223 djm 1818: {
1819: size_t i;
1.231 djm 1820: u_int socknum, activefds = npfd;
1.223 djm 1821:
1822: for (i = 0; i < npfd; i++) {
1823: if (pfd[i].revents == 0)
1824: continue;
1825: /* Find sockets entry */
1826: for (socknum = 0; socknum < sockets_alloc; socknum++) {
1827: if (sockets[socknum].type != AUTH_SOCKET &&
1828: sockets[socknum].type != AUTH_CONNECTION)
1829: continue;
1830: if (pfd[i].fd == sockets[socknum].fd)
1831: break;
1832: }
1833: if (socknum >= sockets_alloc) {
1.266 djm 1834: error_f("no socket for fd %d", pfd[i].fd);
1.223 djm 1835: continue;
1836: }
1837: /* Process events */
1838: switch (sockets[socknum].type) {
1839: case AUTH_SOCKET:
1.231 djm 1840: if ((pfd[i].revents & (POLLIN|POLLERR)) == 0)
1841: break;
1842: if (npfd > maxfds) {
1843: debug3("out of fds (active %u >= limit %u); "
1844: "skipping accept", activefds, maxfds);
1845: break;
1846: }
1847: if (handle_socket_read(socknum) == 0)
1848: activefds++;
1.223 djm 1849: break;
1850: case AUTH_CONNECTION:
1.279 djm 1851: if ((pfd[i].revents & (POLLIN|POLLHUP|POLLERR)) != 0 &&
1852: handle_conn_read(socknum) != 0)
1.231 djm 1853: goto close_sock;
1854: if ((pfd[i].revents & (POLLOUT|POLLHUP)) != 0 &&
1855: handle_conn_write(socknum) != 0) {
1856: close_sock:
1857: if (activefds == 0)
1858: fatal("activefds == 0 at close_sock");
1.223 djm 1859: close_socket(&sockets[socknum]);
1.231 djm 1860: activefds--;
1.223 djm 1861: break;
1862: }
1863: break;
1864: default:
1865: break;
1866: }
1867: }
1868: }
1869:
1870: static int
1.231 djm 1871: prepare_poll(struct pollfd **pfdp, size_t *npfdp, int *timeoutp, u_int maxfds)
1.223 djm 1872: {
1873: struct pollfd *pfd = *pfdp;
1874: size_t i, j, npfd = 0;
1.174 dtucker 1875: time_t deadline;
1.233 djm 1876: int r;
1.46 markus 1877:
1.223 djm 1878: /* Count active sockets */
1.46 markus 1879: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 1880: switch (sockets[i].type) {
1881: case AUTH_SOCKET:
1882: case AUTH_CONNECTION:
1.223 djm 1883: npfd++;
1.21 markus 1884: break;
1885: case AUTH_UNUSED:
1886: break;
1887: default:
1888: fatal("Unknown socket type %d", sockets[i].type);
1889: break;
1890: }
1.46 markus 1891: }
1.223 djm 1892: if (npfd != *npfdp &&
1893: (pfd = recallocarray(pfd, *npfdp, npfd, sizeof(*pfd))) == NULL)
1.266 djm 1894: fatal_f("recallocarray failed");
1.223 djm 1895: *pfdp = pfd;
1896: *npfdp = npfd;
1.46 markus 1897:
1.223 djm 1898: for (i = j = 0; i < sockets_alloc; i++) {
1.46 markus 1899: switch (sockets[i].type) {
1900: case AUTH_SOCKET:
1.231 djm 1901: if (npfd > maxfds) {
1902: debug3("out of fds (active %zu >= limit %u); "
1903: "skipping arming listener", npfd, maxfds);
1904: break;
1905: }
1906: pfd[j].fd = sockets[i].fd;
1907: pfd[j].revents = 0;
1908: pfd[j].events = POLLIN;
1909: j++;
1910: break;
1.46 markus 1911: case AUTH_CONNECTION:
1.223 djm 1912: pfd[j].fd = sockets[i].fd;
1913: pfd[j].revents = 0;
1.233 djm 1914: /*
1915: * Only prepare to read if we can handle a full-size
1916: * input read buffer and enqueue a max size reply..
1917: */
1918: if ((r = sshbuf_check_reserve(sockets[i].input,
1919: AGENT_RBUF_LEN)) == 0 &&
1920: (r = sshbuf_check_reserve(sockets[i].output,
1.278 djm 1921: AGENT_MAX_LEN)) == 0)
1.233 djm 1922: pfd[j].events = POLLIN;
1.266 djm 1923: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1924: fatal_fr(r, "reserve");
1.194 markus 1925: if (sshbuf_len(sockets[i].output) > 0)
1.223 djm 1926: pfd[j].events |= POLLOUT;
1927: j++;
1.46 markus 1928: break;
1929: default:
1930: break;
1931: }
1932: }
1.155 dtucker 1933: deadline = reaper();
1934: if (parent_alive_interval != 0)
1935: deadline = (deadline == 0) ? parent_alive_interval :
1.214 deraadt 1936: MINIMUM(deadline, parent_alive_interval);
1.155 dtucker 1937: if (deadline == 0) {
1.224 djm 1938: *timeoutp = -1; /* INFTIM */
1.155 dtucker 1939: } else {
1.223 djm 1940: if (deadline > INT_MAX / 1000)
1941: *timeoutp = INT_MAX / 1000;
1942: else
1943: *timeoutp = deadline * 1000;
1.155 dtucker 1944: }
1.46 markus 1945: return (1);
1.21 markus 1946: }
1947:
1.55 itojun 1948: static void
1.113 markus 1949: cleanup_socket(void)
1.15 markus 1950: {
1.187 djm 1951: if (cleanup_pid != 0 && getpid() != cleanup_pid)
1952: return;
1.266 djm 1953: debug_f("cleanup");
1.48 deraadt 1954: if (socket_name[0])
1955: unlink(socket_name);
1956: if (socket_dir[0])
1957: rmdir(socket_dir);
1.10 markus 1958: }
1959:
1.114 markus 1960: void
1.15 markus 1961: cleanup_exit(int i)
1962: {
1.113 markus 1963: cleanup_socket();
1964: _exit(i);
1.15 markus 1965: }
1966:
1.55 itojun 1967: static void
1.48 deraadt 1968: cleanup_handler(int sig)
1969: {
1.113 markus 1970: cleanup_socket();
1.163 markus 1971: #ifdef ENABLE_PKCS11
1972: pkcs11_terminate();
1973: #endif
1.48 deraadt 1974: _exit(2);
1.113 markus 1975: }
1976:
1.68 markus 1977: static void
1.155 dtucker 1978: check_parent_exists(void)
1.68 markus 1979: {
1.172 dtucker 1980: /*
1981: * If our parent has exited then getppid() will return (pid_t)1,
1982: * so testing for that should be safe.
1983: */
1984: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1985: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1986: cleanup_socket();
1987: _exit(2);
1.68 markus 1988: }
1.48 deraadt 1989: }
1990:
1.55 itojun 1991: static void
1.50 itojun 1992: usage(void)
1.15 markus 1993: {
1.184 deraadt 1994: fprintf(stderr,
1.250 jmc 1995: "usage: ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]\n"
1.293 jmc 1996: " [-O option] [-P allowed_providers] [-t life]\n"
1997: " ssh-agent [-a bind_address] [-E fingerprint_hash] [-O option]\n"
1998: " [-P allowed_providers] [-t life] command [arg ...]\n"
1.250 jmc 1999: " ssh-agent [-c | -s] -k\n");
1.21 markus 2000: exit(1);
1.15 markus 2001: }
2002:
1.2 provos 2003: int
2004: main(int ac, char **av)
1.1 deraadt 2005: {
1.201 djm 2006: int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0;
1.265 djm 2007: int sock, ch, result, saved_errno;
1.96 deraadt 2008: char *shell, *format, *pidstr, *agentsocket = NULL;
1.41 markus 2009: struct rlimit rlim;
1.96 deraadt 2010: extern int optind;
1.98 stevesk 2011: extern char *optarg;
1.21 markus 2012: pid_t pid;
1.96 deraadt 2013: char pidstrbuf[1 + 3 * sizeof pid];
1.161 tobias 2014: size_t len;
1.189 djm 2015: mode_t prev_mask;
1.224 djm 2016: int timeout = -1; /* INFTIM */
1.223 djm 2017: struct pollfd *pfd = NULL;
2018: size_t npfd = 0;
1.231 djm 2019: u_int maxfds;
1.123 djm 2020:
2021: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
2022: sanitise_stdfd();
1.99 markus 2023:
2024: /* drop */
2025: setegid(getgid());
2026: setgid(getgid());
1.53 markus 2027:
1.231 djm 2028: if (getrlimit(RLIMIT_NOFILE, &rlim) == -1)
2029: fatal("%s: getrlimit: %s", __progname, strerror(errno));
2030:
1.185 markus 2031: #ifdef WITH_OPENSSL
1.170 djm 2032: OpenSSL_add_all_algorithms();
1.185 markus 2033: #endif
1.21 markus 2034:
1.258 djm 2035: while ((ch = getopt(ac, av, "cDdksE:a:O:P:t:")) != -1) {
1.21 markus 2036: switch (ch) {
1.192 djm 2037: case 'E':
2038: fingerprint_hash = ssh_digest_alg_by_name(optarg);
2039: if (fingerprint_hash == -1)
2040: fatal("Invalid hash algorithm \"%s\"", optarg);
2041: break;
1.21 markus 2042: case 'c':
2043: if (s_flag)
2044: usage();
2045: c_flag++;
2046: break;
2047: case 'k':
2048: k_flag++;
1.258 djm 2049: break;
2050: case 'O':
2051: if (strcmp(optarg, "no-restrict-websafe") == 0)
1.297.4.1! bluhm 2052: restrict_websafe = 0;
! 2053: else if (strcmp(optarg, "allow-remote-pkcs11") == 0)
! 2054: remote_add_provider = 1;
1.258 djm 2055: else
2056: fatal("Unknown -O option");
1.21 markus 2057: break;
1.215 djm 2058: case 'P':
1.260 djm 2059: if (allowed_providers != NULL)
1.215 djm 2060: fatal("-P option already specified");
1.260 djm 2061: allowed_providers = xstrdup(optarg);
1.215 djm 2062: break;
1.21 markus 2063: case 's':
2064: if (c_flag)
2065: usage();
2066: s_flag++;
2067: break;
1.57 markus 2068: case 'd':
1.201 djm 2069: if (d_flag || D_flag)
1.57 markus 2070: usage();
2071: d_flag++;
2072: break;
1.201 djm 2073: case 'D':
2074: if (d_flag || D_flag)
2075: usage();
2076: D_flag++;
2077: break;
1.86 markus 2078: case 'a':
2079: agentsocket = optarg;
1.106 marc 2080: break;
2081: case 't':
2082: if ((lifetime = convtime(optarg)) == -1) {
2083: fprintf(stderr, "Invalid lifetime\n");
2084: usage();
2085: }
1.86 markus 2086: break;
1.21 markus 2087: default:
2088: usage();
2089: }
2090: }
2091: ac -= optind;
2092: av += optind;
2093:
1.201 djm 2094: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag || D_flag))
1.21 markus 2095: usage();
2096:
1.260 djm 2097: if (allowed_providers == NULL)
1.262 djm 2098: allowed_providers = xstrdup(DEFAULT_ALLOWED_PROVIDERS);
1.215 djm 2099:
1.85 markus 2100: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 2101: shell = getenv("SHELL");
1.161 tobias 2102: if (shell != NULL && (len = strlen(shell)) > 2 &&
2103: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 2104: c_flag = 1;
2105: }
2106: if (k_flag) {
1.136 deraadt 2107: const char *errstr = NULL;
2108:
1.21 markus 2109: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
2110: if (pidstr == NULL) {
2111: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 2112: SSH_AGENTPID_ENV_NAME);
1.21 markus 2113: exit(1);
2114: }
1.136 deraadt 2115: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
2116: if (errstr) {
2117: fprintf(stderr,
2118: "%s=\"%s\", which is not a good PID: %s\n",
2119: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 2120: exit(1);
2121: }
2122: if (kill(pid, SIGTERM) == -1) {
2123: perror("kill");
2124: exit(1);
2125: }
2126: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 2127: printf(format, SSH_AUTHSOCKET_ENV_NAME);
2128: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 2129: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 2130: exit(0);
2131: }
1.231 djm 2132:
2133: /*
2134: * Minimum file descriptors:
2135: * stdio (3) + listener (1) + syslog (1 maybe) + connection (1) +
2136: * a few spare for libc / stack protectors / sanitisers, etc.
2137: */
2138: #define SSH_AGENT_MIN_FDS (3+1+1+1+4)
2139: if (rlim.rlim_cur < SSH_AGENT_MIN_FDS)
1.232 djm 2140: fatal("%s: file descriptor rlimit %lld too low (minimum %u)",
1.231 djm 2141: __progname, (long long)rlim.rlim_cur, SSH_AGENT_MIN_FDS);
2142: maxfds = rlim.rlim_cur - SSH_AGENT_MIN_FDS;
2143:
1.21 markus 2144: parent_pid = getpid();
2145:
1.86 markus 2146: if (agentsocket == NULL) {
2147: /* Create private directory for agent socket */
1.171 djm 2148: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 2149: if (mkdtemp(socket_dir) == NULL) {
2150: perror("mkdtemp: private socket dir");
2151: exit(1);
2152: }
1.91 mpech 2153: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
2154: (long)parent_pid);
1.86 markus 2155: } else {
2156: /* Try to use specified agent socket */
2157: socket_dir[0] = '\0';
2158: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 2159: }
2160:
1.23 markus 2161: /*
2162: * Create socket early so it will exist before command gets run from
2163: * the parent.
2164: */
1.189 djm 2165: prev_mask = umask(0177);
1.188 millert 2166: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 2167: if (sock < 0) {
1.188 millert 2168: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 2169: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 2170: cleanup_exit(1);
2171: }
1.189 djm 2172: umask(prev_mask);
1.46 markus 2173:
1.23 markus 2174: /*
2175: * Fork, and have the parent execute the command, if any, or present
2176: * the socket data. The child continues as the authentication agent.
2177: */
1.201 djm 2178: if (D_flag || d_flag) {
2179: log_init(__progname,
2180: d_flag ? SYSLOG_LEVEL_DEBUG3 : SYSLOG_LEVEL_INFO,
2181: SYSLOG_FACILITY_AUTH, 1);
1.57 markus 2182: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
2183: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
2184: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 2185: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.210 dtucker 2186: fflush(stdout);
1.57 markus 2187: goto skip;
2188: }
1.21 markus 2189: pid = fork();
2190: if (pid == -1) {
2191: perror("fork");
1.81 stevesk 2192: cleanup_exit(1);
1.21 markus 2193: }
2194: if (pid != 0) { /* Parent - execute the given command. */
2195: close(sock);
1.91 mpech 2196: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 2197: if (ac == 0) {
2198: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
2199: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 2200: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 2201: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 2202: SSH_AGENTPID_ENV_NAME);
1.91 mpech 2203: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 2204: exit(0);
2205: }
1.36 deraadt 2206: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
2207: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
2208: perror("setenv");
2209: exit(1);
2210: }
1.21 markus 2211: execvp(av[0], av);
2212: perror(av[0]);
2213: exit(1);
2214: }
1.81 stevesk 2215: /* child */
2216: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 2217:
2218: if (setsid() == -1) {
1.81 stevesk 2219: error("setsid: %s", strerror(errno));
1.67 stevesk 2220: cleanup_exit(1);
2221: }
2222:
2223: (void)chdir("/");
1.265 djm 2224: if (stdfd_devnull(1, 1, 1) == -1)
1.266 djm 2225: error_f("stdfd_devnull failed");
1.21 markus 2226:
1.41 markus 2227: /* deny core dumps, since memory contains unencrypted private keys */
2228: rlim.rlim_cur = rlim.rlim_max = 0;
1.237 deraadt 2229: if (setrlimit(RLIMIT_CORE, &rlim) == -1) {
1.81 stevesk 2230: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 2231: cleanup_exit(1);
2232: }
1.57 markus 2233:
2234: skip:
1.187 djm 2235:
2236: cleanup_pid = getpid();
1.163 markus 2237:
2238: #ifdef ENABLE_PKCS11
2239: pkcs11_init(0);
2240: #endif
1.21 markus 2241: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 2242: if (ac > 0)
2243: parent_alive_interval = 10;
1.33 markus 2244: idtab_init();
1.252 dtucker 2245: ssh_signal(SIGPIPE, SIG_IGN);
2246: ssh_signal(SIGINT, (d_flag | D_flag) ? cleanup_handler : SIG_IGN);
2247: ssh_signal(SIGHUP, cleanup_handler);
2248: ssh_signal(SIGTERM, cleanup_handler);
1.205 djm 2249:
1.215 djm 2250: if (pledge("stdio rpath cpath unix id proc exec", NULL) == -1)
1.205 djm 2251: fatal("%s: pledge: %s", __progname, strerror(errno));
1.66 markus 2252:
1.21 markus 2253: while (1) {
1.231 djm 2254: prepare_poll(&pfd, &npfd, &timeout, maxfds);
1.223 djm 2255: result = poll(pfd, npfd, timeout);
1.154 dtucker 2256: saved_errno = errno;
1.155 dtucker 2257: if (parent_alive_interval != 0)
2258: check_parent_exists();
2259: (void) reaper(); /* remove expired keys */
1.237 deraadt 2260: if (result == -1) {
1.154 dtucker 2261: if (saved_errno == EINTR)
1.21 markus 2262: continue;
1.223 djm 2263: fatal("poll: %s", strerror(saved_errno));
1.154 dtucker 2264: } else if (result > 0)
1.231 djm 2265: after_poll(pfd, npfd, maxfds);
1.15 markus 2266: }
1.21 markus 2267: /* NOTREACHED */
1.1 deraadt 2268: }
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