Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.292.4.1
1.292.4.1! bluhm 1: /* $OpenBSD: ssh-agent.c,v 1.292 2022/09/17 10:11:29 djm Exp $ */
1.1 deraadt 2: /*
1.22 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * The authentication agent program.
1.33 markus 7: *
1.35 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
1.56 markus 14: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.35 deraadt 15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.22 deraadt 35: */
1.1 deraadt 36:
1.151 deraadt 37: #include <sys/types.h>
1.153 djm 38: #include <sys/time.h>
1.78 provos 39: #include <sys/queue.h>
1.127 stevesk 40: #include <sys/resource.h>
1.141 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"
1.37 markus 70: #include "compat.h"
1.47 markus 71: #include "log.h"
1.107 markus 72: #include "misc.h"
1.182 markus 73: #include "digest.h"
1.194 markus 74: #include "ssherr.h"
1.215 djm 75: #include "match.h"
1.238 djm 76: #include "msg.h"
1.244 djm 77: #include "ssherr.h"
1.238 djm 78: #include "pathnames.h"
1.163 markus 79: #include "ssh-pkcs11.h"
1.251 djm 80: #include "sk-api.h"
1.281 djm 81: #include "myproposal.h"
1.59 markus 82:
1.262 djm 83: #ifndef DEFAULT_ALLOWED_PROVIDERS
84: # define DEFAULT_ALLOWED_PROVIDERS "/usr/lib*/*,/usr/local/lib*/*"
1.215 djm 85: #endif
86:
1.223 djm 87: /* Maximum accepted message length */
1.280 djm 88: #define AGENT_MAX_LEN (256*1024)
1.233 djm 89: /* Maximum bytes to read from client socket */
1.280 djm 90: #define AGENT_RBUF_LEN (4096)
91: /* Maximum number of recorded session IDs/hostkeys per connection */
92: #define AGENT_MAX_SESSION_IDS 16
93: /* Maximum size of session ID */
94: #define AGENT_MAX_SID_LEN 128
1.281 djm 95: /* Maximum number of destination constraints to accept on a key */
96: #define AGENT_MAX_DEST_CONSTRAINTS 1024
1.280 djm 97:
98: /* XXX store hostkey_sid in a refcounted tree */
1.223 djm 99:
1.73 stevesk 100: typedef enum {
1.275 djm 101: AUTH_UNUSED = 0,
102: AUTH_SOCKET = 1,
103: AUTH_CONNECTION = 2,
1.73 stevesk 104: } sock_type;
105:
1.280 djm 106: struct hostkey_sid {
107: struct sshkey *key;
108: struct sshbuf *sid;
109: int forwarded;
110: };
111:
1.274 djm 112: typedef struct socket_entry {
1.21 markus 113: int fd;
1.73 stevesk 114: sock_type type;
1.194 markus 115: struct sshbuf *input;
116: struct sshbuf *output;
117: struct sshbuf *request;
1.280 djm 118: size_t nsession_ids;
119: struct hostkey_sid *session_ids;
1.1 deraadt 120: } SocketEntry;
121:
1.45 markus 122: u_int sockets_alloc = 0;
1.1 deraadt 123: SocketEntry *sockets = NULL;
124:
1.78 provos 125: typedef struct identity {
126: TAILQ_ENTRY(identity) next;
1.194 markus 127: struct sshkey *key;
1.21 markus 128: char *comment;
1.163 markus 129: char *provider;
1.174 dtucker 130: time_t death;
1.107 markus 131: u_int confirm;
1.238 djm 132: char *sk_provider;
1.281 djm 133: struct dest_constraint *dest_constraints;
134: size_t ndest_constraints;
1.1 deraadt 135: } Identity;
136:
1.221 djm 137: struct idtable {
1.33 markus 138: int nentries;
1.78 provos 139: TAILQ_HEAD(idqueue, identity) idlist;
1.221 djm 140: };
1.33 markus 141:
1.221 djm 142: /* private key table */
143: struct idtable *idtab;
1.1 deraadt 144:
145: int max_fd = 0;
146:
1.11 markus 147: /* pid of shell == parent of agent */
1.29 deraadt 148: pid_t parent_pid = -1;
1.176 dtucker 149: time_t parent_alive_interval = 0;
1.10 markus 150:
1.187 djm 151: /* pid of process for which cleanup_socket is applicable */
152: pid_t cleanup_pid = 0;
153:
1.10 markus 154: /* pathname and directory for AUTH_SOCKET */
1.196 deraadt 155: char socket_name[PATH_MAX];
156: char socket_dir[PATH_MAX];
1.10 markus 157:
1.260 djm 158: /* Pattern-list of allowed PKCS#11/Security key paths */
159: static char *allowed_providers;
1.215 djm 160:
1.292.4.1! bluhm 161: /*
! 162: * Allows PKCS11 providers or SK keys that use non-internal providers to
! 163: * be added over a remote connection (identified by session-bind@openssh.com).
! 164: */
! 165: static int remote_add_provider;
! 166:
1.88 markus 167: /* locking */
1.203 dtucker 168: #define LOCK_SIZE 32
169: #define LOCK_SALT_SIZE 16
170: #define LOCK_ROUNDS 1
1.88 markus 171: int locked = 0;
1.213 djm 172: u_char lock_pwhash[LOCK_SIZE];
173: u_char lock_salt[LOCK_SALT_SIZE];
1.88 markus 174:
1.20 markus 175: extern char *__progname;
176:
1.174 dtucker 177: /* Default lifetime in seconds (0 == forever) */
1.268 dtucker 178: static int lifetime = 0;
1.106 marc 179:
1.192 djm 180: static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
181:
1.258 djm 182: /* Refuse signing of non-SSH messages for web-origin FIDO keys */
183: static int restrict_websafe = 1;
184:
1.55 itojun 185: static void
1.101 stevesk 186: close_socket(SocketEntry *e)
187: {
1.280 djm 188: size_t i;
189:
1.101 stevesk 190: close(e->fd);
1.194 markus 191: sshbuf_free(e->input);
192: sshbuf_free(e->output);
193: sshbuf_free(e->request);
1.280 djm 194: for (i = 0; i < e->nsession_ids; i++) {
195: sshkey_free(e->session_ids[i].key);
196: sshbuf_free(e->session_ids[i].sid);
197: }
198: free(e->session_ids);
1.269 djm 199: memset(e, '\0', sizeof(*e));
200: e->fd = -1;
201: e->type = AUTH_UNUSED;
1.101 stevesk 202: }
203:
204: static void
1.33 markus 205: idtab_init(void)
1.1 deraadt 206: {
1.221 djm 207: idtab = xcalloc(1, sizeof(*idtab));
208: TAILQ_INIT(&idtab->idlist);
209: idtab->nentries = 0;
1.33 markus 210: }
211:
1.89 markus 212: static void
1.281 djm 213: free_dest_constraint_hop(struct dest_constraint_hop *dch)
214: {
215: u_int i;
216:
217: if (dch == NULL)
218: return;
219: free(dch->user);
220: free(dch->hostname);
221: for (i = 0; i < dch->nkeys; i++)
222: sshkey_free(dch->keys[i]);
223: free(dch->keys);
224: free(dch->key_is_ca);
225: }
226:
227: static void
228: free_dest_constraints(struct dest_constraint *dcs, size_t ndcs)
229: {
230: size_t i;
231:
232: for (i = 0; i < ndcs; i++) {
233: free_dest_constraint_hop(&dcs[i].from);
234: free_dest_constraint_hop(&dcs[i].to);
235: }
236: free(dcs);
237: }
238:
239: static void
1.89 markus 240: free_identity(Identity *id)
241: {
1.194 markus 242: sshkey_free(id->key);
1.173 djm 243: free(id->provider);
244: free(id->comment);
1.238 djm 245: free(id->sk_provider);
1.281 djm 246: free_dest_constraints(id->dest_constraints, id->ndest_constraints);
1.173 djm 247: free(id);
1.89 markus 248: }
249:
1.281 djm 250: /*
251: * Match 'key' against the key/CA list in a destination constraint hop
252: * Returns 0 on success or -1 otherwise.
253: */
254: static int
255: match_key_hop(const char *tag, const struct sshkey *key,
256: const struct dest_constraint_hop *dch)
257: {
258: const char *reason = NULL;
1.286 dtucker 259: const char *hostname = dch->hostname ? dch->hostname : "(ORIGIN)";
1.281 djm 260: u_int i;
261: char *fp;
262:
263: if (key == NULL)
264: return -1;
265: /* XXX logspam */
266: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
267: SSH_FP_DEFAULT)) == NULL)
268: fatal_f("fingerprint failed");
269: debug3_f("%s: entering hostname %s, requested key %s %s, %u keys avail",
1.286 dtucker 270: tag, hostname, sshkey_type(key), fp, dch->nkeys);
1.281 djm 271: free(fp);
272: for (i = 0; i < dch->nkeys; i++) {
273: if (dch->keys[i] == NULL)
274: return -1;
275: /* XXX logspam */
276: if ((fp = sshkey_fingerprint(dch->keys[i], SSH_FP_HASH_DEFAULT,
277: SSH_FP_DEFAULT)) == NULL)
278: fatal_f("fingerprint failed");
279: debug3_f("%s: key %u: %s%s %s", tag, i,
280: dch->key_is_ca[i] ? "CA " : "",
281: sshkey_type(dch->keys[i]), fp);
282: free(fp);
283: if (!sshkey_is_cert(key)) {
284: /* plain key */
285: if (dch->key_is_ca[i] ||
286: !sshkey_equal(key, dch->keys[i]))
287: continue;
288: return 0;
289: }
290: /* certificate */
291: if (!dch->key_is_ca[i])
292: continue;
293: if (key->cert == NULL || key->cert->signature_key == NULL)
294: return -1; /* shouldn't happen */
295: if (!sshkey_equal(key->cert->signature_key, dch->keys[i]))
296: continue;
1.286 dtucker 297: if (sshkey_cert_check_host(key, hostname, 1,
1.281 djm 298: SSH_ALLOWED_CA_SIGALGS, &reason) != 0) {
299: debug_f("cert %s / hostname %s rejected: %s",
1.286 dtucker 300: key->cert->key_id, hostname, reason);
1.281 djm 301: continue;
302: }
303: return 0;
304: }
305: return -1;
306: }
307:
308: /* Check destination constraints on an identity against the hostkey/user */
309: static int
310: permitted_by_dest_constraints(const struct sshkey *fromkey,
311: const struct sshkey *tokey, Identity *id, const char *user,
312: const char **hostnamep)
313: {
314: size_t i;
315: struct dest_constraint *d;
316:
317: if (hostnamep != NULL)
318: *hostnamep = NULL;
319: for (i = 0; i < id->ndest_constraints; i++) {
320: d = id->dest_constraints + i;
321: /* XXX remove logspam */
322: debug2_f("constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)",
323: i, d->from.user ? d->from.user : "",
324: d->from.user ? "@" : "",
325: d->from.hostname ? d->from.hostname : "(ORIGIN)",
326: d->from.nkeys,
327: d->to.user ? d->to.user : "", d->to.user ? "@" : "",
328: d->to.hostname ? d->to.hostname : "(ANY)", d->to.nkeys);
329:
330: /* Match 'from' key */
331: if (fromkey == NULL) {
332: /* We are matching the first hop */
333: if (d->from.hostname != NULL || d->from.nkeys != 0)
334: continue;
335: } else if (match_key_hop("from", fromkey, &d->from) != 0)
336: continue;
337:
338: /* Match 'to' key */
339: if (tokey != NULL && match_key_hop("to", tokey, &d->to) != 0)
340: continue;
341:
342: /* Match user if specified */
343: if (d->to.user != NULL && user != NULL &&
344: !match_pattern(user, d->to.user))
345: continue;
346:
347: /* successfully matched this constraint */
348: if (hostnamep != NULL)
349: *hostnamep = d->to.hostname;
350: debug2_f("allowed for hostname %s",
351: d->to.hostname == NULL ? "*" : d->to.hostname);
352: return 0;
353: }
354: /* no match */
355: debug2_f("%s identity \"%s\" not permitted for this destination",
356: sshkey_type(id->key), id->comment);
357: return -1;
358: }
359:
360: /*
361: * Check whether hostkeys on a SocketEntry and the optionally specified user
362: * are permitted by the destination constraints on the Identity.
363: * Returns 0 on success or -1 otherwise.
364: */
365: static int
366: identity_permitted(Identity *id, SocketEntry *e, char *user,
367: const char **forward_hostnamep, const char **last_hostnamep)
368: {
369: size_t i;
370: const char **hp;
371: struct hostkey_sid *hks;
372: const struct sshkey *fromkey = NULL;
373: const char *test_user;
374: char *fp1, *fp2;
375:
376: /* XXX remove logspam */
377: debug3_f("entering: key %s comment \"%s\", %zu socket bindings, "
378: "%zu constraints", sshkey_type(id->key), id->comment,
379: e->nsession_ids, id->ndest_constraints);
380: if (id->ndest_constraints == 0)
381: return 0; /* unconstrained */
382: if (e->nsession_ids == 0)
383: return 0; /* local use */
384: /*
385: * Walk through the hops recorded by session_id and try to find a
386: * constraint that satisfies each.
387: */
388: for (i = 0; i < e->nsession_ids; i++) {
389: hks = e->session_ids + i;
390: if (hks->key == NULL)
391: fatal_f("internal error: no bound key");
392: /* XXX remove logspam */
393: fp1 = fp2 = NULL;
394: if (fromkey != NULL &&
395: (fp1 = sshkey_fingerprint(fromkey, SSH_FP_HASH_DEFAULT,
396: SSH_FP_DEFAULT)) == NULL)
397: fatal_f("fingerprint failed");
398: if ((fp2 = sshkey_fingerprint(hks->key, SSH_FP_HASH_DEFAULT,
399: SSH_FP_DEFAULT)) == NULL)
400: fatal_f("fingerprint failed");
401: debug3_f("socketentry fd=%d, entry %zu %s, "
402: "from hostkey %s %s to user %s hostkey %s %s",
403: e->fd, i, hks->forwarded ? "FORWARD" : "AUTH",
404: fromkey ? sshkey_type(fromkey) : "(ORIGIN)",
405: fromkey ? fp1 : "", user ? user : "(ANY)",
406: sshkey_type(hks->key), fp2);
407: free(fp1);
408: free(fp2);
409: /*
410: * Record the hostnames for the initial forwarding and
411: * the final destination.
412: */
413: hp = NULL;
414: if (i == e->nsession_ids - 1)
415: hp = last_hostnamep;
416: else if (i == 0)
417: hp = forward_hostnamep;
418: /* Special handling for final recorded binding */
419: test_user = NULL;
420: if (i == e->nsession_ids - 1) {
421: /* Can only check user at final hop */
422: test_user = user;
423: /*
424: * user is only presented for signature requests.
425: * If this is the case, make sure last binding is not
426: * for a forwarding.
427: */
428: if (hks->forwarded && user != NULL) {
429: error_f("tried to sign on forwarding hop");
430: return -1;
431: }
432: } else if (!hks->forwarded) {
433: error_f("tried to forward though signing bind");
434: return -1;
435: }
436: if (permitted_by_dest_constraints(fromkey, hks->key, id,
437: test_user, hp) != 0)
438: return -1;
439: fromkey = hks->key;
440: }
441: /*
442: * Another special case: if the last bound session ID was for a
443: * forwarding, and this function is not being called to check a sign
444: * request (i.e. no 'user' supplied), then only permit the key if
445: * there is a permission that would allow it to be used at another
446: * destination. This hides keys that are allowed to be used to
1.284 jsg 447: * authenticate *to* a host but not permitted for *use* beyond it.
1.281 djm 448: */
449: hks = &e->session_ids[e->nsession_ids - 1];
450: if (hks->forwarded && user == NULL &&
451: permitted_by_dest_constraints(hks->key, NULL, id,
452: NULL, NULL) != 0) {
453: debug3_f("key permitted at host but not after");
454: return -1;
455: }
456:
457: /* success */
458: return 0;
459: }
460:
1.33 markus 461: /* return matching private key for given public key */
1.78 provos 462: static Identity *
1.221 djm 463: lookup_identity(struct sshkey *key)
1.33 markus 464: {
1.78 provos 465: Identity *id;
466:
1.221 djm 467: TAILQ_FOREACH(id, &idtab->idlist, next) {
1.194 markus 468: if (sshkey_equal(key, id->key))
1.78 provos 469: return (id);
1.33 markus 470: }
1.78 provos 471: return (NULL);
472: }
473:
1.107 markus 474: /* Check confirmation of keysign request */
475: static int
1.270 djm 476: confirm_key(Identity *id, const char *extra)
1.107 markus 477: {
1.122 djm 478: char *p;
1.107 markus 479: int ret = -1;
480:
1.194 markus 481: p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT);
1.197 djm 482: if (p != NULL &&
1.270 djm 483: ask_permission("Allow use of key %s?\nKey fingerprint %s.%s%s",
484: id->comment, p,
485: extra == NULL ? "" : "\n", extra == NULL ? "" : extra))
1.122 djm 486: ret = 0;
1.173 djm 487: free(p);
1.122 djm 488:
1.107 markus 489: return (ret);
490: }
491:
1.194 markus 492: static void
493: send_status(SocketEntry *e, int success)
494: {
495: int r;
496:
497: if ((r = sshbuf_put_u32(e->output, 1)) != 0 ||
498: (r = sshbuf_put_u8(e->output, success ?
499: SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0)
1.266 djm 500: fatal_fr(r, "compose");
1.194 markus 501: }
502:
1.33 markus 503: /* send list of supported public keys to 'client' */
1.55 itojun 504: static void
1.221 djm 505: process_request_identities(SocketEntry *e)
1.33 markus 506: {
1.96 deraadt 507: Identity *id;
1.281 djm 508: struct sshbuf *msg, *keys;
1.194 markus 509: int r;
1.281 djm 510: u_int nentries = 0;
1.1 deraadt 511:
1.269 djm 512: debug2_f("entering");
513:
1.281 djm 514: if ((msg = sshbuf_new()) == NULL || (keys = sshbuf_new()) == NULL)
1.266 djm 515: fatal_f("sshbuf_new failed");
1.221 djm 516: TAILQ_FOREACH(id, &idtab->idlist, next) {
1.281 djm 517: /* identity not visible, don't include in response */
518: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
519: continue;
520: if ((r = sshkey_puts_opts(id->key, keys,
1.278 djm 521: SSHKEY_SERIALIZE_INFO)) != 0 ||
1.281 djm 522: (r = sshbuf_put_cstring(keys, id->comment)) != 0) {
1.266 djm 523: error_fr(r, "compose key/comment");
1.220 djm 524: continue;
1.33 markus 525: }
1.281 djm 526: nentries++;
1.21 markus 527: }
1.281 djm 528: debug2_f("replying with %u allowed of %u available keys",
529: nentries, idtab->nentries);
530: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
531: (r = sshbuf_put_u32(msg, nentries)) != 0 ||
532: (r = sshbuf_putb(msg, keys)) != 0)
533: fatal_fr(r, "compose");
1.194 markus 534: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 535: fatal_fr(r, "enqueue");
1.194 markus 536: sshbuf_free(msg);
1.281 djm 537: sshbuf_free(keys);
1.1 deraadt 538: }
539:
1.33 markus 540:
1.208 markus 541: static char *
542: agent_decode_alg(struct sshkey *key, u_int flags)
543: {
544: if (key->type == KEY_RSA) {
545: if (flags & SSH_AGENT_RSA_SHA2_256)
546: return "rsa-sha2-256";
547: else if (flags & SSH_AGENT_RSA_SHA2_512)
548: return "rsa-sha2-512";
1.235 djm 549: } else if (key->type == KEY_RSA_CERT) {
550: if (flags & SSH_AGENT_RSA_SHA2_256)
551: return "rsa-sha2-256-cert-v01@openssh.com";
552: else if (flags & SSH_AGENT_RSA_SHA2_512)
553: return "rsa-sha2-512-cert-v01@openssh.com";
1.208 markus 554: }
555: return NULL;
556: }
557:
1.258 djm 558: /*
1.270 djm 559: * Attempt to parse the contents of a buffer as a SSH publickey userauth
560: * request, checking its contents for consistency and matching the embedded
561: * key against the one that is being used for signing.
562: * Note: does not modify msg buffer.
1.282 djm 563: * Optionally extract the username, session ID and/or hostkey from the request.
1.258 djm 564: */
565: static int
1.270 djm 566: parse_userauth_request(struct sshbuf *msg, const struct sshkey *expected_key,
1.282 djm 567: char **userp, struct sshbuf **sess_idp, struct sshkey **hostkeyp)
1.258 djm 568: {
1.270 djm 569: struct sshbuf *b = NULL, *sess_id = NULL;
570: char *user = NULL, *service = NULL, *method = NULL, *pkalg = NULL;
1.258 djm 571: int r;
1.270 djm 572: u_char t, sig_follows;
1.282 djm 573: struct sshkey *mkey = NULL, *hostkey = NULL;
1.258 djm 574:
1.270 djm 575: if (userp != NULL)
576: *userp = NULL;
577: if (sess_idp != NULL)
578: *sess_idp = NULL;
1.282 djm 579: if (hostkeyp != NULL)
580: *hostkeyp = NULL;
1.270 djm 581: if ((b = sshbuf_fromb(msg)) == NULL)
582: fatal_f("sshbuf_fromb");
1.258 djm 583:
584: /* SSH userauth request */
1.270 djm 585: if ((r = sshbuf_froms(b, &sess_id)) != 0)
586: goto out;
587: if (sshbuf_len(sess_id) == 0) {
588: r = SSH_ERR_INVALID_FORMAT;
589: goto out;
590: }
591: if ((r = sshbuf_get_u8(b, &t)) != 0 || /* SSH2_MSG_USERAUTH_REQUEST */
592: (r = sshbuf_get_cstring(b, &user, NULL)) != 0 || /* server user */
593: (r = sshbuf_get_cstring(b, &service, NULL)) != 0 || /* service */
594: (r = sshbuf_get_cstring(b, &method, NULL)) != 0 || /* method */
595: (r = sshbuf_get_u8(b, &sig_follows)) != 0 || /* sig-follows */
596: (r = sshbuf_get_cstring(b, &pkalg, NULL)) != 0 || /* alg */
597: (r = sshkey_froms(b, &mkey)) != 0) /* key */
598: goto out;
599: if (t != SSH2_MSG_USERAUTH_REQUEST ||
600: sig_follows != 1 ||
601: strcmp(service, "ssh-connection") != 0 ||
602: !sshkey_equal(expected_key, mkey) ||
603: sshkey_type_from_name(pkalg) != expected_key->type) {
604: r = SSH_ERR_INVALID_FORMAT;
605: goto out;
606: }
1.282 djm 607: if (strcmp(method, "publickey-hostbound-v00@openssh.com") == 0) {
608: if ((r = sshkey_froms(b, &hostkey)) != 0)
609: goto out;
610: } else if (strcmp(method, "publickey") != 0) {
1.270 djm 611: r = SSH_ERR_INVALID_FORMAT;
612: goto out;
613: }
614: if (sshbuf_len(b) != 0) {
615: r = SSH_ERR_INVALID_FORMAT;
616: goto out;
617: }
618: /* success */
619: r = 0;
620: debug3_f("well formed userauth");
621: if (userp != NULL) {
622: *userp = user;
623: user = NULL;
624: }
625: if (sess_idp != NULL) {
626: *sess_idp = sess_id;
627: sess_id = NULL;
1.258 djm 628: }
1.282 djm 629: if (hostkeyp != NULL) {
630: *hostkeyp = hostkey;
631: hostkey = NULL;
632: }
1.270 djm 633: out:
634: sshbuf_free(b);
635: sshbuf_free(sess_id);
636: free(user);
637: free(service);
638: free(method);
639: free(pkalg);
1.258 djm 640: sshkey_free(mkey);
1.282 djm 641: sshkey_free(hostkey);
1.270 djm 642: return r;
643: }
644:
645: /*
646: * Attempt to parse the contents of a buffer as a SSHSIG signature request.
647: * Note: does not modify buffer.
648: */
649: static int
650: parse_sshsig_request(struct sshbuf *msg)
651: {
652: int r;
653: struct sshbuf *b;
654:
655: if ((b = sshbuf_fromb(msg)) == NULL)
656: fatal_f("sshbuf_fromb");
657:
658: if ((r = sshbuf_cmp(b, 0, "SSHSIG", 6)) != 0 ||
659: (r = sshbuf_consume(b, 6)) != 0 ||
660: (r = sshbuf_get_cstring(b, NULL, NULL)) != 0 || /* namespace */
661: (r = sshbuf_get_string_direct(b, NULL, NULL)) != 0 || /* reserved */
662: (r = sshbuf_get_cstring(b, NULL, NULL)) != 0 || /* hashalg */
663: (r = sshbuf_get_string_direct(b, NULL, NULL)) != 0) /* H(msg) */
664: goto out;
665: if (sshbuf_len(b) != 0) {
666: r = SSH_ERR_INVALID_FORMAT;
667: goto out;
668: }
669: /* success */
670: r = 0;
671: out:
1.258 djm 672: sshbuf_free(b);
1.270 djm 673: return r;
674: }
675:
676: /*
677: * This function inspects a message to be signed by a FIDO key that has a
678: * web-like application string (i.e. one that does not begin with "ssh:".
679: * It checks that the message is one of those expected for SSH operations
680: * (pubkey userauth, sshsig, CA key signing) to exclude signing challenges
681: * for the web.
682: */
683: static int
684: check_websafe_message_contents(struct sshkey *key, struct sshbuf *data)
685: {
1.282 djm 686: if (parse_userauth_request(data, key, NULL, NULL, NULL) == 0) {
1.270 djm 687: debug_f("signed data matches public key userauth request");
1.258 djm 688: return 1;
689: }
1.270 djm 690: if (parse_sshsig_request(data) == 0) {
691: debug_f("signed data matches SSHSIG signature request");
1.258 djm 692: return 1;
1.270 djm 693: }
1.258 djm 694:
1.270 djm 695: /* XXX check CA signature operation */
1.258 djm 696:
697: error("web-origin key attempting to sign non-SSH message");
698: return 0;
699: }
700:
1.280 djm 701: static int
702: buf_equal(const struct sshbuf *a, const struct sshbuf *b)
703: {
704: if (sshbuf_ptr(a) == NULL || sshbuf_ptr(b) == NULL)
705: return SSH_ERR_INVALID_ARGUMENT;
706: if (sshbuf_len(a) != sshbuf_len(b))
707: return SSH_ERR_INVALID_FORMAT;
708: if (timingsafe_bcmp(sshbuf_ptr(a), sshbuf_ptr(b), sshbuf_len(a)) != 0)
709: return SSH_ERR_INVALID_FORMAT;
710: return 0;
711: }
712:
1.33 markus 713: /* ssh2 only */
1.55 itojun 714: static void
1.33 markus 715: process_sign_request2(SocketEntry *e)
716: {
1.221 djm 717: u_char *signature = NULL;
1.281 djm 718: size_t slen = 0;
1.194 markus 719: u_int compat = 0, flags;
1.287 djm 720: int r, ok = -1, retried = 0;
721: char *fp = NULL, *pin = NULL, *prompt = NULL;
722: char *user = NULL, *sig_dest = NULL;
1.281 djm 723: const char *fwd_host = NULL, *dest_host = NULL;
1.280 djm 724: struct sshbuf *msg = NULL, *data = NULL, *sid = NULL;
1.283 djm 725: struct sshkey *key = NULL, *hostkey = NULL;
1.195 djm 726: struct identity *id;
1.251 djm 727: struct notifier_ctx *notifier = NULL;
1.194 markus 728:
1.270 djm 729: debug_f("entering");
730:
1.273 dtucker 731: if ((msg = sshbuf_new()) == NULL || (data = sshbuf_new()) == NULL)
1.266 djm 732: fatal_f("sshbuf_new failed");
1.221 djm 733: if ((r = sshkey_froms(e->request, &key)) != 0 ||
1.270 djm 734: (r = sshbuf_get_stringb(e->request, data)) != 0 ||
1.225 djm 735: (r = sshbuf_get_u32(e->request, &flags)) != 0) {
1.266 djm 736: error_fr(r, "parse");
1.225 djm 737: goto send;
738: }
739:
1.221 djm 740: if ((id = lookup_identity(key)) == NULL) {
1.266 djm 741: verbose_f("%s key not found", sshkey_type(key));
1.195 djm 742: goto send;
743: }
1.281 djm 744: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
745: SSH_FP_DEFAULT)) == NULL)
746: fatal_f("fingerprint failed");
747:
748: if (id->ndest_constraints != 0) {
749: if (e->nsession_ids == 0) {
750: logit_f("refusing use of destination-constrained key "
751: "to sign on unbound connection");
752: goto send;
753: }
1.283 djm 754: if (parse_userauth_request(data, key, &user, &sid,
755: &hostkey) != 0) {
1.281 djm 756: logit_f("refusing use of destination-constrained key "
757: "to sign an unidentified signature");
758: goto send;
759: }
760: /* XXX logspam */
761: debug_f("user=%s", user);
762: if (identity_permitted(id, e, user, &fwd_host, &dest_host) != 0)
763: goto send;
764: /* XXX display fwd_host/dest_host in askpass UI */
1.280 djm 765: /*
1.281 djm 766: * Ensure that the session ID is the most recent one
767: * registered on the socket - it should have been bound by
768: * ssh immediately before userauth.
1.280 djm 769: */
1.281 djm 770: if (buf_equal(sid,
771: e->session_ids[e->nsession_ids - 1].sid) != 0) {
772: error_f("unexpected session ID (%zu listed) on "
773: "signature request for target user %s with "
774: "key %s %s", e->nsession_ids, user,
775: sshkey_type(id->key), fp);
776: goto send;
1.280 djm 777: }
1.283 djm 778: /*
779: * Ensure that the hostkey embedded in the signature matches
780: * the one most recently bound to the socket. An exception is
781: * made for the initial forwarding hop.
782: */
783: if (e->nsession_ids > 1 && hostkey == NULL) {
784: error_f("refusing use of destination-constrained key: "
785: "no hostkey recorded in signature for forwarded "
786: "connection");
787: goto send;
788: }
789: if (hostkey != NULL && !sshkey_equal(hostkey,
790: e->session_ids[e->nsession_ids - 1].key)) {
791: error_f("refusing use of destination-constrained key: "
792: "mismatch between hostkey in request and most "
793: "recently bound session");
794: goto send;
795: }
1.281 djm 796: xasprintf(&sig_dest, "public key authentication request for "
797: "user \"%s\" to listed host", user);
1.280 djm 798: }
799: if (id->confirm && confirm_key(id, sig_dest) != 0) {
1.266 djm 800: verbose_f("user refused key");
1.195 djm 801: goto send;
802: }
1.258 djm 803: if (sshkey_is_sk(id->key)) {
1.292 djm 804: if (restrict_websafe &&
805: strncmp(id->key->sk_application, "ssh:", 4) != 0 &&
1.270 djm 806: !check_websafe_message_contents(key, data)) {
1.258 djm 807: /* error already logged */
808: goto send;
809: }
1.290 djm 810: if (id->key->sk_flags & SSH_SK_USER_PRESENCE_REQD) {
1.258 djm 811: notifier = notify_start(0,
1.280 djm 812: "Confirm user presence for key %s %s%s%s",
813: sshkey_type(id->key), fp,
814: sig_dest == NULL ? "" : "\n",
815: sig_dest == NULL ? "" : sig_dest);
1.258 djm 816: }
1.251 djm 817: }
1.287 djm 818: retry_pin:
1.251 djm 819: if ((r = sshkey_sign(id->key, &signature, &slen,
1.270 djm 820: sshbuf_ptr(data), sshbuf_len(data), agent_decode_alg(key, flags),
1.287 djm 821: id->sk_provider, pin, compat)) != 0) {
822: debug_fr(r, "sshkey_sign");
823: if (pin == NULL && !retried && sshkey_is_sk(id->key) &&
824: r == SSH_ERR_KEY_WRONG_PASSPHRASE) {
1.289 djm 825: notify_complete(notifier, NULL);
826: notifier = NULL;
1.287 djm 827: /* XXX include sig_dest */
828: xasprintf(&prompt, "Enter PIN%sfor %s key %s: ",
829: (id->key->sk_flags & SSH_SK_USER_PRESENCE_REQD) ?
830: " and confirm user presence " : " ",
831: sshkey_type(id->key), fp);
832: pin = read_passphrase(prompt, RP_USE_ASKPASS);
833: retried = 1;
834: goto retry_pin;
835: }
1.266 djm 836: error_fr(r, "sshkey_sign");
1.251 djm 837: goto send;
1.33 markus 838: }
1.195 djm 839: /* Success */
840: ok = 0;
841: send:
1.291 djm 842: debug_f("good signature");
1.267 djm 843: notify_complete(notifier, "User presence confirmed");
1.270 djm 844:
1.33 markus 845: if (ok == 0) {
1.194 markus 846: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
847: (r = sshbuf_put_string(msg, signature, slen)) != 0)
1.266 djm 848: fatal_fr(r, "compose");
1.194 markus 849: } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
1.266 djm 850: fatal_fr(r, "compose failure");
1.194 markus 851:
852: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 853: fatal_fr(r, "enqueue");
1.194 markus 854:
1.280 djm 855: sshbuf_free(sid);
1.270 djm 856: sshbuf_free(data);
1.194 markus 857: sshbuf_free(msg);
1.270 djm 858: sshkey_free(key);
1.283 djm 859: sshkey_free(hostkey);
1.270 djm 860: free(fp);
1.173 djm 861: free(signature);
1.280 djm 862: free(sig_dest);
863: free(user);
1.287 djm 864: free(prompt);
865: if (pin != NULL)
866: freezero(pin, strlen(pin));
1.1 deraadt 867: }
868:
1.33 markus 869: /* shared */
1.55 itojun 870: static void
1.221 djm 871: process_remove_identity(SocketEntry *e)
1.1 deraadt 872: {
1.194 markus 873: int r, success = 0;
874: struct sshkey *key = NULL;
1.221 djm 875: Identity *id;
1.21 markus 876:
1.269 djm 877: debug2_f("entering");
1.221 djm 878: if ((r = sshkey_froms(e->request, &key)) != 0) {
1.266 djm 879: error_fr(r, "parse key");
1.221 djm 880: goto done;
881: }
882: if ((id = lookup_identity(key)) == NULL) {
1.266 djm 883: debug_f("key not found");
1.221 djm 884: goto done;
885: }
1.281 djm 886: /* identity not visible, cannot be removed */
887: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
888: goto done; /* error already logged */
1.221 djm 889: /* We have this key, free it. */
890: if (idtab->nentries < 1)
1.266 djm 891: fatal_f("internal error: nentries %d", idtab->nentries);
1.221 djm 892: TAILQ_REMOVE(&idtab->idlist, id, next);
893: free_identity(id);
894: idtab->nentries--;
895: success = 1;
896: done:
1.276 djm 897: sshkey_free(key);
1.194 markus 898: send_status(e, success);
1.1 deraadt 899: }
900:
1.55 itojun 901: static void
1.221 djm 902: process_remove_all_identities(SocketEntry *e)
1.1 deraadt 903: {
1.78 provos 904: Identity *id;
1.21 markus 905:
1.269 djm 906: debug2_f("entering");
1.21 markus 907: /* Loop over all identities and clear the keys. */
1.221 djm 908: for (id = TAILQ_FIRST(&idtab->idlist); id;
909: id = TAILQ_FIRST(&idtab->idlist)) {
910: TAILQ_REMOVE(&idtab->idlist, id, next);
1.78 provos 911: free_identity(id);
1.21 markus 912: }
913:
914: /* Mark that there are no identities. */
1.221 djm 915: idtab->nentries = 0;
1.21 markus 916:
917: /* Send success. */
1.194 markus 918: send_status(e, 1);
1.1 deraadt 919: }
920:
1.155 dtucker 921: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 922: static time_t
1.89 markus 923: reaper(void)
924: {
1.175 dtucker 925: time_t deadline = 0, now = monotime();
1.89 markus 926: Identity *id, *nxt;
927:
1.221 djm 928: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
929: nxt = TAILQ_NEXT(id, next);
930: if (id->death == 0)
931: continue;
932: if (now >= id->death) {
933: debug("expiring key '%s'", id->comment);
934: TAILQ_REMOVE(&idtab->idlist, id, next);
935: free_identity(id);
936: idtab->nentries--;
937: } else
938: deadline = (deadline == 0) ? id->death :
939: MINIMUM(deadline, id->death);
1.89 markus 940: }
1.155 dtucker 941: if (deadline == 0 || deadline <= now)
942: return 0;
943: else
944: return (deadline - now);
1.89 markus 945: }
946:
1.271 djm 947: static int
1.281 djm 948: parse_dest_constraint_hop(struct sshbuf *b, struct dest_constraint_hop *dch)
949: {
950: u_char key_is_ca;
951: size_t elen = 0;
952: int r;
953: struct sshkey *k = NULL;
954: char *fp;
955:
956: memset(dch, '\0', sizeof(*dch));
957: if ((r = sshbuf_get_cstring(b, &dch->user, NULL)) != 0 ||
958: (r = sshbuf_get_cstring(b, &dch->hostname, NULL)) != 0 ||
959: (r = sshbuf_get_string_direct(b, NULL, &elen)) != 0) {
960: error_fr(r, "parse");
961: goto out;
962: }
963: if (elen != 0) {
964: error_f("unsupported extensions (len %zu)", elen);
965: r = SSH_ERR_FEATURE_UNSUPPORTED;
966: goto out;
967: }
968: if (*dch->hostname == '\0') {
969: free(dch->hostname);
970: dch->hostname = NULL;
971: }
972: if (*dch->user == '\0') {
973: free(dch->user);
974: dch->user = NULL;
975: }
976: while (sshbuf_len(b) != 0) {
977: dch->keys = xrecallocarray(dch->keys, dch->nkeys,
978: dch->nkeys + 1, sizeof(*dch->keys));
979: dch->key_is_ca = xrecallocarray(dch->key_is_ca, dch->nkeys,
980: dch->nkeys + 1, sizeof(*dch->key_is_ca));
981: if ((r = sshkey_froms(b, &k)) != 0 ||
982: (r = sshbuf_get_u8(b, &key_is_ca)) != 0)
983: goto out;
984: if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT,
985: SSH_FP_DEFAULT)) == NULL)
986: fatal_f("fingerprint failed");
987: debug3_f("%s%s%s: adding %skey %s %s",
988: dch->user == NULL ? "" : dch->user,
989: dch->user == NULL ? "" : "@",
990: dch->hostname, key_is_ca ? "CA " : "", sshkey_type(k), fp);
991: free(fp);
992: dch->keys[dch->nkeys] = k;
993: dch->key_is_ca[dch->nkeys] = key_is_ca != 0;
994: dch->nkeys++;
995: k = NULL; /* transferred */
996: }
997: /* success */
998: r = 0;
999: out:
1000: sshkey_free(k);
1001: return r;
1002: }
1003:
1004: static int
1005: parse_dest_constraint(struct sshbuf *m, struct dest_constraint *dc)
1006: {
1007: struct sshbuf *b = NULL, *frombuf = NULL, *tobuf = NULL;
1008: int r;
1009: size_t elen = 0;
1010:
1011: debug3_f("entering");
1012:
1013: memset(dc, '\0', sizeof(*dc));
1014: if ((r = sshbuf_froms(m, &b)) != 0 ||
1015: (r = sshbuf_froms(b, &frombuf)) != 0 ||
1016: (r = sshbuf_froms(b, &tobuf)) != 0 ||
1017: (r = sshbuf_get_string_direct(b, NULL, &elen)) != 0) {
1018: error_fr(r, "parse");
1019: goto out;
1020: }
1021: if ((r = parse_dest_constraint_hop(frombuf, &dc->from) != 0) ||
1022: (r = parse_dest_constraint_hop(tobuf, &dc->to) != 0))
1023: goto out; /* already logged */
1024: if (elen != 0) {
1025: error_f("unsupported extensions (len %zu)", elen);
1026: r = SSH_ERR_FEATURE_UNSUPPORTED;
1027: goto out;
1028: }
1029: debug2_f("parsed %s (%u keys) > %s%s%s (%u keys)",
1030: dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc->from.nkeys,
1031: dc->to.user ? dc->to.user : "", dc->to.user ? "@" : "",
1032: dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys);
1033: /* check consistency */
1034: if ((dc->from.hostname == NULL) != (dc->from.nkeys == 0) ||
1035: dc->from.user != NULL) {
1036: error_f("inconsistent \"from\" specification");
1037: r = SSH_ERR_INVALID_FORMAT;
1038: goto out;
1039: }
1040: if (dc->to.hostname == NULL || dc->to.nkeys == 0) {
1041: error_f("incomplete \"to\" specification");
1042: r = SSH_ERR_INVALID_FORMAT;
1043: goto out;
1044: }
1045: /* success */
1046: r = 0;
1047: out:
1048: sshbuf_free(b);
1049: sshbuf_free(frombuf);
1050: sshbuf_free(tobuf);
1051: return r;
1052: }
1053:
1054: static int
1055: parse_key_constraint_extension(struct sshbuf *m, char **sk_providerp,
1056: struct dest_constraint **dcsp, size_t *ndcsp)
1.277 djm 1057: {
1058: char *ext_name = NULL;
1059: int r;
1.281 djm 1060: struct sshbuf *b = NULL;
1.277 djm 1061:
1062: if ((r = sshbuf_get_cstring(m, &ext_name, NULL)) != 0) {
1063: error_fr(r, "parse constraint extension");
1064: goto out;
1065: }
1066: debug_f("constraint ext %s", ext_name);
1067: if (strcmp(ext_name, "sk-provider@openssh.com") == 0) {
1068: if (sk_providerp == NULL) {
1069: error_f("%s not valid here", ext_name);
1070: r = SSH_ERR_INVALID_FORMAT;
1071: goto out;
1072: }
1073: if (*sk_providerp != NULL) {
1074: error_f("%s already set", ext_name);
1075: r = SSH_ERR_INVALID_FORMAT;
1076: goto out;
1077: }
1078: if ((r = sshbuf_get_cstring(m, sk_providerp, NULL)) != 0) {
1079: error_fr(r, "parse %s", ext_name);
1080: goto out;
1081: }
1.281 djm 1082: } else if (strcmp(ext_name,
1083: "restrict-destination-v00@openssh.com") == 0) {
1084: if (*dcsp != NULL) {
1085: error_f("%s already set", ext_name);
1086: goto out;
1087: }
1088: if ((r = sshbuf_froms(m, &b)) != 0) {
1089: error_fr(r, "parse %s outer", ext_name);
1090: goto out;
1091: }
1092: while (sshbuf_len(b) != 0) {
1093: if (*ndcsp >= AGENT_MAX_DEST_CONSTRAINTS) {
1094: error_f("too many %s constraints", ext_name);
1095: goto out;
1096: }
1097: *dcsp = xrecallocarray(*dcsp, *ndcsp, *ndcsp + 1,
1098: sizeof(**dcsp));
1099: if ((r = parse_dest_constraint(b,
1100: *dcsp + (*ndcsp)++)) != 0)
1101: goto out; /* error already logged */
1102: }
1.277 djm 1103: } else {
1104: error_f("unsupported constraint \"%s\"", ext_name);
1105: r = SSH_ERR_FEATURE_UNSUPPORTED;
1106: goto out;
1107: }
1108: /* success */
1109: r = 0;
1110: out:
1111: free(ext_name);
1.281 djm 1112: sshbuf_free(b);
1.277 djm 1113: return r;
1114: }
1115:
1116: static int
1.271 djm 1117: parse_key_constraints(struct sshbuf *m, struct sshkey *k, time_t *deathp,
1.281 djm 1118: u_int *secondsp, int *confirmp, char **sk_providerp,
1119: struct dest_constraint **dcsp, size_t *ndcsp)
1.1 deraadt 1120: {
1.194 markus 1121: u_char ctype;
1.271 djm 1122: int r;
1123: u_int seconds, maxsign = 0;
1.33 markus 1124:
1.271 djm 1125: while (sshbuf_len(m)) {
1126: if ((r = sshbuf_get_u8(m, &ctype)) != 0) {
1.266 djm 1127: error_fr(r, "parse constraint type");
1.277 djm 1128: goto out;
1.194 markus 1129: }
1130: switch (ctype) {
1.94 markus 1131: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.271 djm 1132: if (*deathp != 0) {
1133: error_f("lifetime already set");
1.277 djm 1134: r = SSH_ERR_INVALID_FORMAT;
1135: goto out;
1.271 djm 1136: }
1137: if ((r = sshbuf_get_u32(m, &seconds)) != 0) {
1.266 djm 1138: error_fr(r, "parse lifetime constraint");
1.277 djm 1139: goto out;
1.194 markus 1140: }
1.271 djm 1141: *deathp = monotime() + seconds;
1142: *secondsp = seconds;
1.94 markus 1143: break;
1.107 markus 1144: case SSH_AGENT_CONSTRAIN_CONFIRM:
1.271 djm 1145: if (*confirmp != 0) {
1146: error_f("confirm already set");
1.277 djm 1147: r = SSH_ERR_INVALID_FORMAT;
1148: goto out;
1.271 djm 1149: }
1150: *confirmp = 1;
1.107 markus 1151: break;
1.228 markus 1152: case SSH_AGENT_CONSTRAIN_MAXSIGN:
1.271 djm 1153: if (k == NULL) {
1154: error_f("maxsign not valid here");
1.277 djm 1155: r = SSH_ERR_INVALID_FORMAT;
1156: goto out;
1.271 djm 1157: }
1158: if (maxsign != 0) {
1159: error_f("maxsign already set");
1.277 djm 1160: r = SSH_ERR_INVALID_FORMAT;
1161: goto out;
1.271 djm 1162: }
1163: if ((r = sshbuf_get_u32(m, &maxsign)) != 0) {
1.266 djm 1164: error_fr(r, "parse maxsign constraint");
1.277 djm 1165: goto out;
1.228 markus 1166: }
1167: if ((r = sshkey_enable_maxsign(k, maxsign)) != 0) {
1.266 djm 1168: error_fr(r, "enable maxsign");
1.277 djm 1169: goto out;
1.228 markus 1170: }
1171: break;
1.238 djm 1172: case SSH_AGENT_CONSTRAIN_EXTENSION:
1.277 djm 1173: if ((r = parse_key_constraint_extension(m,
1.281 djm 1174: sk_providerp, dcsp, ndcsp)) != 0)
1.277 djm 1175: goto out; /* error already logged */
1.238 djm 1176: break;
1.94 markus 1177: default:
1.266 djm 1178: error_f("Unknown constraint %d", ctype);
1.277 djm 1179: r = SSH_ERR_FEATURE_UNSUPPORTED;
1180: goto out;
1.94 markus 1181: }
1182: }
1.271 djm 1183: /* success */
1.277 djm 1184: r = 0;
1185: out:
1186: return r;
1.271 djm 1187: }
1188:
1189: static void
1190: process_add_identity(SocketEntry *e)
1191: {
1192: Identity *id;
1193: int success = 0, confirm = 0;
1.272 dtucker 1194: char *fp, *comment = NULL, *sk_provider = NULL;
1.271 djm 1195: char canonical_provider[PATH_MAX];
1196: time_t death = 0;
1197: u_int seconds = 0;
1.281 djm 1198: struct dest_constraint *dest_constraints = NULL;
1199: size_t ndest_constraints = 0;
1.271 djm 1200: struct sshkey *k = NULL;
1201: int r = SSH_ERR_INTERNAL_ERROR;
1202:
1203: debug2_f("entering");
1204: if ((r = sshkey_private_deserialize(e->request, &k)) != 0 ||
1205: k == NULL ||
1206: (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
1207: error_fr(r, "parse");
1208: goto out;
1209: }
1210: if (parse_key_constraints(e->request, k, &death, &seconds, &confirm,
1.281 djm 1211: &sk_provider, &dest_constraints, &ndest_constraints) != 0) {
1.271 djm 1212: error_f("failed to parse constraints");
1213: sshbuf_reset(e->request);
1214: goto out;
1215: }
1216:
1.238 djm 1217: if (sk_provider != NULL) {
1.240 markus 1218: if (!sshkey_is_sk(k)) {
1.255 naddy 1219: error("Cannot add provider: %s is not an "
1220: "authenticator-hosted key", sshkey_type(k));
1.271 djm 1221: goto out;
1.238 djm 1222: }
1.254 djm 1223: if (strcasecmp(sk_provider, "internal") == 0) {
1.266 djm 1224: debug_f("internal provider");
1.254 djm 1225: } else {
1.292.4.1! bluhm 1226: if (e->nsession_ids != 0 && !remote_add_provider) {
! 1227: verbose("failed add of SK provider \"%.100s\": "
! 1228: "remote addition of providers is disabled",
! 1229: sk_provider);
! 1230: goto out;
! 1231: }
1.254 djm 1232: if (realpath(sk_provider, canonical_provider) == NULL) {
1233: verbose("failed provider \"%.100s\": "
1234: "realpath: %s", sk_provider,
1235: strerror(errno));
1.271 djm 1236: goto out;
1.254 djm 1237: }
1.238 djm 1238: free(sk_provider);
1.254 djm 1239: sk_provider = xstrdup(canonical_provider);
1240: if (match_pattern_list(sk_provider,
1.260 djm 1241: allowed_providers, 0) != 1) {
1.254 djm 1242: error("Refusing add key: "
1.260 djm 1243: "provider %s not allowed", sk_provider);
1.271 djm 1244: goto out;
1.254 djm 1245: }
1.238 djm 1246: }
1.242 markus 1247: }
1248: if ((r = sshkey_shield_private(k)) != 0) {
1.266 djm 1249: error_fr(r, "shield private");
1.271 djm 1250: goto out;
1.238 djm 1251: }
1.106 marc 1252: if (lifetime && !death)
1.175 dtucker 1253: death = monotime() + lifetime;
1.221 djm 1254: if ((id = lookup_identity(k)) == NULL) {
1.163 markus 1255: id = xcalloc(1, sizeof(Identity));
1.221 djm 1256: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1.33 markus 1257: /* Increment the number of identities. */
1.221 djm 1258: idtab->nentries++;
1.33 markus 1259: } else {
1.281 djm 1260: /* identity not visible, do not update */
1261: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
1262: goto out; /* error already logged */
1.228 markus 1263: /* key state might have been updated */
1264: sshkey_free(id->key);
1.173 djm 1265: free(id->comment);
1.238 djm 1266: free(id->sk_provider);
1.281 djm 1267: free_dest_constraints(id->dest_constraints,
1268: id->ndest_constraints);
1.33 markus 1269: }
1.271 djm 1270: /* success */
1.228 markus 1271: id->key = k;
1.157 canacar 1272: id->comment = comment;
1273: id->death = death;
1274: id->confirm = confirm;
1.238 djm 1275: id->sk_provider = sk_provider;
1.281 djm 1276: id->dest_constraints = dest_constraints;
1277: id->ndest_constraints = ndest_constraints;
1.238 djm 1278:
1279: if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT,
1280: SSH_FP_DEFAULT)) == NULL)
1.266 djm 1281: fatal_f("sshkey_fingerprint failed");
1282: debug_f("add %s %s \"%.100s\" (life: %u) (confirm: %u) "
1.281 djm 1283: "(provider: %s) (destination constraints: %zu)",
1284: sshkey_ssh_name(k), fp, comment, seconds, confirm,
1285: sk_provider == NULL ? "none" : sk_provider, ndest_constraints);
1.238 djm 1286: free(fp);
1.271 djm 1287: /* transferred */
1288: k = NULL;
1289: comment = NULL;
1290: sk_provider = NULL;
1.281 djm 1291: dest_constraints = NULL;
1292: ndest_constraints = 0;
1.271 djm 1293: success = 1;
1294: out:
1295: free(sk_provider);
1296: free(comment);
1297: sshkey_free(k);
1.281 djm 1298: free_dest_constraints(dest_constraints, ndest_constraints);
1.194 markus 1299: send_status(e, success);
1.1 deraadt 1300: }
1301:
1.88 markus 1302: /* XXX todo: encrypt sensitive data with passphrase */
1303: static void
1304: process_lock_agent(SocketEntry *e, int lock)
1305: {
1.203 dtucker 1306: int r, success = 0, delay;
1.213 djm 1307: char *passwd;
1308: u_char passwdhash[LOCK_SIZE];
1.203 dtucker 1309: static u_int fail_count = 0;
1310: size_t pwlen;
1311:
1.269 djm 1312: debug2_f("entering");
1.226 djm 1313: /*
1314: * This is deliberately fatal: the user has requested that we lock,
1315: * but we can't parse their request properly. The only safe thing to
1316: * do is abort.
1317: */
1.203 dtucker 1318: if ((r = sshbuf_get_cstring(e->request, &passwd, &pwlen)) != 0)
1.266 djm 1319: fatal_fr(r, "parse");
1.203 dtucker 1320: if (pwlen == 0) {
1321: debug("empty password not supported");
1322: } else if (locked && !lock) {
1323: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1324: passwdhash, sizeof(passwdhash), LOCK_ROUNDS) < 0)
1325: fatal("bcrypt_pbkdf");
1.213 djm 1326: if (timingsafe_bcmp(passwdhash, lock_pwhash, LOCK_SIZE) == 0) {
1.203 dtucker 1327: debug("agent unlocked");
1328: locked = 0;
1329: fail_count = 0;
1.213 djm 1330: explicit_bzero(lock_pwhash, sizeof(lock_pwhash));
1.203 dtucker 1331: success = 1;
1332: } else {
1333: /* delay in 0.1s increments up to 10s */
1334: if (fail_count < 100)
1335: fail_count++;
1336: delay = 100000 * fail_count;
1337: debug("unlock failed, delaying %0.1lf seconds",
1338: (double)delay/1000000);
1339: usleep(delay);
1340: }
1341: explicit_bzero(passwdhash, sizeof(passwdhash));
1.88 markus 1342: } else if (!locked && lock) {
1.203 dtucker 1343: debug("agent locked");
1.88 markus 1344: locked = 1;
1.203 dtucker 1345: arc4random_buf(lock_salt, sizeof(lock_salt));
1346: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1.213 djm 1347: lock_pwhash, sizeof(lock_pwhash), LOCK_ROUNDS) < 0)
1.203 dtucker 1348: fatal("bcrypt_pbkdf");
1.88 markus 1349: success = 1;
1350: }
1.256 jsg 1351: freezero(passwd, pwlen);
1.194 markus 1352: send_status(e, success);
1.88 markus 1353: }
1354:
1355: static void
1.221 djm 1356: no_identities(SocketEntry *e)
1.88 markus 1357: {
1.194 markus 1358: struct sshbuf *msg;
1359: int r;
1.88 markus 1360:
1.194 markus 1361: if ((msg = sshbuf_new()) == NULL)
1.266 djm 1362: fatal_f("sshbuf_new failed");
1.221 djm 1363: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
1.194 markus 1364: (r = sshbuf_put_u32(msg, 0)) != 0 ||
1365: (r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 1366: fatal_fr(r, "compose");
1.194 markus 1367: sshbuf_free(msg);
1.88 markus 1368: }
1.59 markus 1369:
1.163 markus 1370: #ifdef ENABLE_PKCS11
1.59 markus 1371: static void
1.158 djm 1372: process_add_smartcard_key(SocketEntry *e)
1.59 markus 1373: {
1.226 djm 1374: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.253 djm 1375: char **comments = NULL;
1.221 djm 1376: int r, i, count = 0, success = 0, confirm = 0;
1.271 djm 1377: u_int seconds = 0;
1.174 dtucker 1378: time_t death = 0;
1.194 markus 1379: struct sshkey **keys = NULL, *k;
1.84 markus 1380: Identity *id;
1.281 djm 1381: struct dest_constraint *dest_constraints = NULL;
1382: size_t ndest_constraints = 0;
1.75 deraadt 1383:
1.269 djm 1384: debug2_f("entering");
1.194 markus 1385: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
1.226 djm 1386: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) {
1.266 djm 1387: error_fr(r, "parse");
1.226 djm 1388: goto send;
1389: }
1.271 djm 1390: if (parse_key_constraints(e->request, NULL, &death, &seconds, &confirm,
1.281 djm 1391: NULL, &dest_constraints, &ndest_constraints) != 0) {
1.271 djm 1392: error_f("failed to parse constraints");
1393: goto send;
1.110 djm 1394: }
1.292.4.1! bluhm 1395: if (e->nsession_ids != 0 && !remote_add_provider) {
! 1396: verbose("failed PKCS#11 add of \"%.100s\": remote addition of "
! 1397: "providers is disabled", provider);
! 1398: goto send;
! 1399: }
1.215 djm 1400: if (realpath(provider, canonical_provider) == NULL) {
1401: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
1402: provider, strerror(errno));
1403: goto send;
1404: }
1.260 djm 1405: if (match_pattern_list(canonical_provider, allowed_providers, 0) != 1) {
1.215 djm 1406: verbose("refusing PKCS#11 add of \"%.100s\": "
1.260 djm 1407: "provider not allowed", canonical_provider);
1.215 djm 1408: goto send;
1409: }
1.266 djm 1410: debug_f("add %.100s", canonical_provider);
1.110 djm 1411: if (lifetime && !death)
1.175 dtucker 1412: death = monotime() + lifetime;
1.110 djm 1413:
1.253 djm 1414: count = pkcs11_add_provider(canonical_provider, pin, &keys, &comments);
1.163 markus 1415: for (i = 0; i < count; i++) {
1.84 markus 1416: k = keys[i];
1.221 djm 1417: if (lookup_identity(k) == NULL) {
1.163 markus 1418: id = xcalloc(1, sizeof(Identity));
1.84 markus 1419: id->key = k;
1.253 djm 1420: keys[i] = NULL; /* transferred */
1.215 djm 1421: id->provider = xstrdup(canonical_provider);
1.253 djm 1422: if (*comments[i] != '\0') {
1423: id->comment = comments[i];
1424: comments[i] = NULL; /* transferred */
1425: } else {
1426: id->comment = xstrdup(canonical_provider);
1427: }
1.110 djm 1428: id->death = death;
1429: id->confirm = confirm;
1.281 djm 1430: id->dest_constraints = dest_constraints;
1431: id->ndest_constraints = ndest_constraints;
1432: dest_constraints = NULL; /* transferred */
1433: ndest_constraints = 0;
1.221 djm 1434: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1435: idtab->nentries++;
1.84 markus 1436: success = 1;
1437: }
1.271 djm 1438: /* XXX update constraints for existing keys */
1.253 djm 1439: sshkey_free(keys[i]);
1440: free(comments[i]);
1.59 markus 1441: }
1442: send:
1.173 djm 1443: free(pin);
1444: free(provider);
1445: free(keys);
1.253 djm 1446: free(comments);
1.281 djm 1447: free_dest_constraints(dest_constraints, ndest_constraints);
1.194 markus 1448: send_status(e, success);
1.59 markus 1449: }
1450:
1451: static void
1452: process_remove_smartcard_key(SocketEntry *e)
1453: {
1.217 djm 1454: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.221 djm 1455: int r, success = 0;
1.163 markus 1456: Identity *id, *nxt;
1.59 markus 1457:
1.269 djm 1458: debug2_f("entering");
1.194 markus 1459: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
1.226 djm 1460: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) {
1.266 djm 1461: error_fr(r, "parse");
1.226 djm 1462: goto send;
1463: }
1.173 djm 1464: free(pin);
1.59 markus 1465:
1.217 djm 1466: if (realpath(provider, canonical_provider) == NULL) {
1467: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
1468: provider, strerror(errno));
1469: goto send;
1470: }
1471:
1.266 djm 1472: debug_f("remove %.100s", canonical_provider);
1.221 djm 1473: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
1474: nxt = TAILQ_NEXT(id, next);
1475: /* Skip file--based keys */
1476: if (id->provider == NULL)
1477: continue;
1478: if (!strcmp(canonical_provider, id->provider)) {
1479: TAILQ_REMOVE(&idtab->idlist, id, next);
1480: free_identity(id);
1481: idtab->nentries--;
1.59 markus 1482: }
1483: }
1.217 djm 1484: if (pkcs11_del_provider(canonical_provider) == 0)
1.163 markus 1485: success = 1;
1486: else
1.266 djm 1487: error_f("pkcs11_del_provider failed");
1.218 deraadt 1488: send:
1.173 djm 1489: free(provider);
1.194 markus 1490: send_status(e, success);
1.59 markus 1491: }
1.163 markus 1492: #endif /* ENABLE_PKCS11 */
1.59 markus 1493:
1.280 djm 1494: static int
1495: process_ext_session_bind(SocketEntry *e)
1496: {
1497: int r, sid_match, key_match;
1498: struct sshkey *key = NULL;
1499: struct sshbuf *sid = NULL, *sig = NULL;
1500: char *fp = NULL;
1501: size_t i;
1.281 djm 1502: u_char fwd = 0;
1.280 djm 1503:
1504: debug2_f("entering");
1505: if ((r = sshkey_froms(e->request, &key)) != 0 ||
1506: (r = sshbuf_froms(e->request, &sid)) != 0 ||
1507: (r = sshbuf_froms(e->request, &sig)) != 0 ||
1508: (r = sshbuf_get_u8(e->request, &fwd)) != 0) {
1509: error_fr(r, "parse");
1510: goto out;
1511: }
1512: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
1513: SSH_FP_DEFAULT)) == NULL)
1514: fatal_f("fingerprint failed");
1515: /* check signature with hostkey on session ID */
1516: if ((r = sshkey_verify(key, sshbuf_ptr(sig), sshbuf_len(sig),
1517: sshbuf_ptr(sid), sshbuf_len(sid), NULL, 0, NULL)) != 0) {
1518: error_fr(r, "sshkey_verify for %s %s", sshkey_type(key), fp);
1519: goto out;
1520: }
1521: /* check whether sid/key already recorded */
1522: for (i = 0; i < e->nsession_ids; i++) {
1.281 djm 1523: if (!e->session_ids[i].forwarded) {
1524: error_f("attempt to bind session ID to socket "
1525: "previously bound for authentication attempt");
1526: r = -1;
1527: goto out;
1528: }
1.280 djm 1529: sid_match = buf_equal(sid, e->session_ids[i].sid) == 0;
1530: key_match = sshkey_equal(key, e->session_ids[i].key);
1531: if (sid_match && key_match) {
1532: debug_f("session ID already recorded for %s %s",
1533: sshkey_type(key), fp);
1534: r = 0;
1535: goto out;
1536: } else if (sid_match) {
1537: error_f("session ID recorded against different key "
1538: "for %s %s", sshkey_type(key), fp);
1539: r = -1;
1540: goto out;
1541: }
1542: /*
1543: * new sid with previously-seen key can happen, e.g. multiple
1544: * connections to the same host.
1545: */
1546: }
1547: /* record new key/sid */
1548: if (e->nsession_ids >= AGENT_MAX_SESSION_IDS) {
1549: error_f("too many session IDs recorded");
1550: goto out;
1551: }
1552: e->session_ids = xrecallocarray(e->session_ids, e->nsession_ids,
1553: e->nsession_ids + 1, sizeof(*e->session_ids));
1554: i = e->nsession_ids++;
1555: debug_f("recorded %s %s (slot %zu of %d)", sshkey_type(key), fp, i,
1556: AGENT_MAX_SESSION_IDS);
1557: e->session_ids[i].key = key;
1558: e->session_ids[i].forwarded = fwd != 0;
1559: key = NULL; /* transferred */
1560: /* can't transfer sid; it's refcounted and scoped to request's life */
1561: if ((e->session_ids[i].sid = sshbuf_new()) == NULL)
1562: fatal_f("sshbuf_new");
1563: if ((r = sshbuf_putb(e->session_ids[i].sid, sid)) != 0)
1564: fatal_fr(r, "sshbuf_putb session ID");
1565: /* success */
1566: r = 0;
1567: out:
1.288 djm 1568: free(fp);
1.280 djm 1569: sshkey_free(key);
1570: sshbuf_free(sid);
1571: sshbuf_free(sig);
1572: return r == 0 ? 1 : 0;
1573: }
1574:
1575: static void
1576: process_extension(SocketEntry *e)
1577: {
1578: int r, success = 0;
1579: char *name;
1580:
1581: debug2_f("entering");
1582: if ((r = sshbuf_get_cstring(e->request, &name, NULL)) != 0) {
1583: error_fr(r, "parse");
1584: goto send;
1585: }
1586: if (strcmp(name, "session-bind@openssh.com") == 0)
1587: success = process_ext_session_bind(e);
1588: else
1589: debug_f("unsupported extension \"%s\"", name);
1.285 djm 1590: free(name);
1.280 djm 1591: send:
1592: send_status(e, success);
1593: }
1.264 djm 1594: /*
1595: * dispatch incoming message.
1596: * returns 1 on success, 0 for incomplete messages or -1 on error.
1597: */
1.223 djm 1598: static int
1599: process_message(u_int socknum)
1.1 deraadt 1600: {
1.194 markus 1601: u_int msg_len;
1602: u_char type;
1603: const u_char *cp;
1604: int r;
1.223 djm 1605: SocketEntry *e;
1606:
1.266 djm 1607: if (socknum >= sockets_alloc)
1608: fatal_f("sock %u >= allocated %u", socknum, sockets_alloc);
1.223 djm 1609: e = &sockets[socknum];
1.89 markus 1610:
1.194 markus 1611: if (sshbuf_len(e->input) < 5)
1.223 djm 1612: return 0; /* Incomplete message header. */
1.194 markus 1613: cp = sshbuf_ptr(e->input);
1614: msg_len = PEEK_U32(cp);
1.223 djm 1615: if (msg_len > AGENT_MAX_LEN) {
1.266 djm 1616: debug_f("socket %u (fd=%d) message too long %u > %u",
1617: socknum, e->fd, msg_len, AGENT_MAX_LEN);
1.223 djm 1618: return -1;
1.21 markus 1619: }
1.194 markus 1620: if (sshbuf_len(e->input) < msg_len + 4)
1.223 djm 1621: return 0; /* Incomplete message body. */
1.87 markus 1622:
1623: /* move the current input to e->request */
1.194 markus 1624: sshbuf_reset(e->request);
1625: if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
1.223 djm 1626: (r = sshbuf_get_u8(e->request, &type)) != 0) {
1627: if (r == SSH_ERR_MESSAGE_INCOMPLETE ||
1628: r == SSH_ERR_STRING_TOO_LARGE) {
1.266 djm 1629: error_fr(r, "parse");
1.223 djm 1630: return -1;
1631: }
1.266 djm 1632: fatal_fr(r, "parse");
1.223 djm 1633: }
1634:
1.266 djm 1635: debug_f("socket %u (fd=%d) type %d", socknum, e->fd, type);
1.21 markus 1636:
1.230 djm 1637: /* check whether agent is locked */
1.88 markus 1638: if (locked && type != SSH_AGENTC_UNLOCK) {
1.194 markus 1639: sshbuf_reset(e->request);
1.88 markus 1640: switch (type) {
1641: case SSH2_AGENTC_REQUEST_IDENTITIES:
1642: /* send empty lists */
1.221 djm 1643: no_identities(e);
1.88 markus 1644: break;
1645: default:
1646: /* send a fail message for all other request types */
1.194 markus 1647: send_status(e, 0);
1.88 markus 1648: }
1.264 djm 1649: return 1;
1.88 markus 1650: }
1651:
1.21 markus 1652: switch (type) {
1.88 markus 1653: case SSH_AGENTC_LOCK:
1654: case SSH_AGENTC_UNLOCK:
1655: process_lock_agent(e, type == SSH_AGENTC_LOCK);
1656: break;
1.21 markus 1657: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.221 djm 1658: process_remove_all_identities(e); /* safe for !WITH_SSH1 */
1.33 markus 1659: break;
1660: /* ssh2 */
1661: case SSH2_AGENTC_SIGN_REQUEST:
1662: process_sign_request2(e);
1663: break;
1664: case SSH2_AGENTC_REQUEST_IDENTITIES:
1.221 djm 1665: process_request_identities(e);
1.33 markus 1666: break;
1667: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 1668: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.221 djm 1669: process_add_identity(e);
1.33 markus 1670: break;
1671: case SSH2_AGENTC_REMOVE_IDENTITY:
1.221 djm 1672: process_remove_identity(e);
1.33 markus 1673: break;
1674: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
1.221 djm 1675: process_remove_all_identities(e);
1.21 markus 1676: break;
1.163 markus 1677: #ifdef ENABLE_PKCS11
1.59 markus 1678: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 1679: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 1680: process_add_smartcard_key(e);
1.75 deraadt 1681: break;
1.59 markus 1682: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
1683: process_remove_smartcard_key(e);
1.75 deraadt 1684: break;
1.163 markus 1685: #endif /* ENABLE_PKCS11 */
1.280 djm 1686: case SSH_AGENTC_EXTENSION:
1687: process_extension(e);
1688: break;
1.21 markus 1689: default:
1690: /* Unknown message. Respond with failure. */
1691: error("Unknown message %d", type);
1.194 markus 1692: sshbuf_reset(e->request);
1693: send_status(e, 0);
1.21 markus 1694: break;
1695: }
1.264 djm 1696: return 1;
1.1 deraadt 1697: }
1698:
1.55 itojun 1699: static void
1.73 stevesk 1700: new_socket(sock_type type, int fd)
1.1 deraadt 1701: {
1.112 markus 1702: u_int i, old_alloc, new_alloc;
1.96 deraadt 1703:
1.269 djm 1704: debug_f("type = %s", type == AUTH_CONNECTION ? "CONNECTION" :
1705: (type == AUTH_SOCKET ? "SOCKET" : "UNKNOWN"));
1.119 djm 1706: set_nonblock(fd);
1.21 markus 1707:
1708: if (fd > max_fd)
1709: max_fd = fd;
1710:
1711: for (i = 0; i < sockets_alloc; i++)
1712: if (sockets[i].type == AUTH_UNUSED) {
1713: sockets[i].fd = fd;
1.266 djm 1714: if ((sockets[i].input = sshbuf_new()) == NULL ||
1715: (sockets[i].output = sshbuf_new()) == NULL ||
1716: (sockets[i].request = sshbuf_new()) == NULL)
1717: fatal_f("sshbuf_new failed");
1.112 markus 1718: sockets[i].type = type;
1.21 markus 1719: return;
1720: }
1721: old_alloc = sockets_alloc;
1.112 markus 1722: new_alloc = sockets_alloc + 10;
1.269 djm 1723: sockets = xrecallocarray(sockets, old_alloc, new_alloc,
1724: sizeof(sockets[0]));
1.112 markus 1725: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 1726: sockets[i].type = AUTH_UNUSED;
1.112 markus 1727: sockets_alloc = new_alloc;
1.21 markus 1728: sockets[old_alloc].fd = fd;
1.266 djm 1729: if ((sockets[old_alloc].input = sshbuf_new()) == NULL ||
1730: (sockets[old_alloc].output = sshbuf_new()) == NULL ||
1731: (sockets[old_alloc].request = sshbuf_new()) == NULL)
1732: fatal_f("sshbuf_new failed");
1.112 markus 1733: sockets[old_alloc].type = type;
1.1 deraadt 1734: }
1735:
1.55 itojun 1736: static int
1.223 djm 1737: handle_socket_read(u_int socknum)
1.1 deraadt 1738: {
1.223 djm 1739: struct sockaddr_un sunaddr;
1740: socklen_t slen;
1741: uid_t euid;
1742: gid_t egid;
1743: int fd;
1744:
1745: slen = sizeof(sunaddr);
1746: fd = accept(sockets[socknum].fd, (struct sockaddr *)&sunaddr, &slen);
1.237 deraadt 1747: if (fd == -1) {
1.223 djm 1748: error("accept from AUTH_SOCKET: %s", strerror(errno));
1749: return -1;
1750: }
1.237 deraadt 1751: if (getpeereid(fd, &euid, &egid) == -1) {
1.223 djm 1752: error("getpeereid %d failed: %s", fd, strerror(errno));
1753: close(fd);
1754: return -1;
1755: }
1756: if ((euid != 0) && (getuid() != euid)) {
1757: error("uid mismatch: peer euid %u != uid %u",
1758: (u_int) euid, (u_int) getuid());
1759: close(fd);
1760: return -1;
1761: }
1762: new_socket(AUTH_CONNECTION, fd);
1763: return 0;
1764: }
1765:
1766: static int
1767: handle_conn_read(u_int socknum)
1768: {
1.233 djm 1769: char buf[AGENT_RBUF_LEN];
1.223 djm 1770: ssize_t len;
1771: int r;
1772:
1773: if ((len = read(sockets[socknum].fd, buf, sizeof(buf))) <= 0) {
1774: if (len == -1) {
1775: if (errno == EAGAIN || errno == EINTR)
1776: return 0;
1.266 djm 1777: error_f("read error on socket %u (fd %d): %s",
1778: socknum, sockets[socknum].fd, strerror(errno));
1.223 djm 1779: }
1780: return -1;
1781: }
1782: if ((r = sshbuf_put(sockets[socknum].input, buf, len)) != 0)
1.266 djm 1783: fatal_fr(r, "compose");
1.223 djm 1784: explicit_bzero(buf, sizeof(buf));
1.264 djm 1785: for (;;) {
1786: if ((r = process_message(socknum)) == -1)
1787: return -1;
1788: else if (r == 0)
1789: break;
1790: }
1.223 djm 1791: return 0;
1792: }
1793:
1794: static int
1795: handle_conn_write(u_int socknum)
1796: {
1797: ssize_t len;
1798: int r;
1799:
1800: if (sshbuf_len(sockets[socknum].output) == 0)
1801: return 0; /* shouldn't happen */
1802: if ((len = write(sockets[socknum].fd,
1803: sshbuf_ptr(sockets[socknum].output),
1804: sshbuf_len(sockets[socknum].output))) <= 0) {
1805: if (len == -1) {
1806: if (errno == EAGAIN || errno == EINTR)
1807: return 0;
1.266 djm 1808: error_f("read error on socket %u (fd %d): %s",
1809: socknum, sockets[socknum].fd, strerror(errno));
1.223 djm 1810: }
1811: return -1;
1812: }
1813: if ((r = sshbuf_consume(sockets[socknum].output, len)) != 0)
1.266 djm 1814: fatal_fr(r, "consume");
1.223 djm 1815: return 0;
1816: }
1817:
1818: static void
1.231 djm 1819: after_poll(struct pollfd *pfd, size_t npfd, u_int maxfds)
1.223 djm 1820: {
1821: size_t i;
1.231 djm 1822: u_int socknum, activefds = npfd;
1.223 djm 1823:
1824: for (i = 0; i < npfd; i++) {
1825: if (pfd[i].revents == 0)
1826: continue;
1827: /* Find sockets entry */
1828: for (socknum = 0; socknum < sockets_alloc; socknum++) {
1829: if (sockets[socknum].type != AUTH_SOCKET &&
1830: sockets[socknum].type != AUTH_CONNECTION)
1831: continue;
1832: if (pfd[i].fd == sockets[socknum].fd)
1833: break;
1834: }
1835: if (socknum >= sockets_alloc) {
1.266 djm 1836: error_f("no socket for fd %d", pfd[i].fd);
1.223 djm 1837: continue;
1838: }
1839: /* Process events */
1840: switch (sockets[socknum].type) {
1841: case AUTH_SOCKET:
1.231 djm 1842: if ((pfd[i].revents & (POLLIN|POLLERR)) == 0)
1843: break;
1844: if (npfd > maxfds) {
1845: debug3("out of fds (active %u >= limit %u); "
1846: "skipping accept", activefds, maxfds);
1847: break;
1848: }
1849: if (handle_socket_read(socknum) == 0)
1850: activefds++;
1.223 djm 1851: break;
1852: case AUTH_CONNECTION:
1.279 djm 1853: if ((pfd[i].revents & (POLLIN|POLLHUP|POLLERR)) != 0 &&
1854: handle_conn_read(socknum) != 0)
1.231 djm 1855: goto close_sock;
1856: if ((pfd[i].revents & (POLLOUT|POLLHUP)) != 0 &&
1857: handle_conn_write(socknum) != 0) {
1858: close_sock:
1859: if (activefds == 0)
1860: fatal("activefds == 0 at close_sock");
1.223 djm 1861: close_socket(&sockets[socknum]);
1.231 djm 1862: activefds--;
1.223 djm 1863: break;
1864: }
1865: break;
1866: default:
1867: break;
1868: }
1869: }
1870: }
1871:
1872: static int
1.231 djm 1873: prepare_poll(struct pollfd **pfdp, size_t *npfdp, int *timeoutp, u_int maxfds)
1.223 djm 1874: {
1875: struct pollfd *pfd = *pfdp;
1876: size_t i, j, npfd = 0;
1.174 dtucker 1877: time_t deadline;
1.233 djm 1878: int r;
1.46 markus 1879:
1.223 djm 1880: /* Count active sockets */
1.46 markus 1881: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 1882: switch (sockets[i].type) {
1883: case AUTH_SOCKET:
1884: case AUTH_CONNECTION:
1.223 djm 1885: npfd++;
1.21 markus 1886: break;
1887: case AUTH_UNUSED:
1888: break;
1889: default:
1890: fatal("Unknown socket type %d", sockets[i].type);
1891: break;
1892: }
1.46 markus 1893: }
1.223 djm 1894: if (npfd != *npfdp &&
1895: (pfd = recallocarray(pfd, *npfdp, npfd, sizeof(*pfd))) == NULL)
1.266 djm 1896: fatal_f("recallocarray failed");
1.223 djm 1897: *pfdp = pfd;
1898: *npfdp = npfd;
1.46 markus 1899:
1.223 djm 1900: for (i = j = 0; i < sockets_alloc; i++) {
1.46 markus 1901: switch (sockets[i].type) {
1902: case AUTH_SOCKET:
1.231 djm 1903: if (npfd > maxfds) {
1904: debug3("out of fds (active %zu >= limit %u); "
1905: "skipping arming listener", npfd, maxfds);
1906: break;
1907: }
1908: pfd[j].fd = sockets[i].fd;
1909: pfd[j].revents = 0;
1910: pfd[j].events = POLLIN;
1911: j++;
1912: break;
1.46 markus 1913: case AUTH_CONNECTION:
1.223 djm 1914: pfd[j].fd = sockets[i].fd;
1915: pfd[j].revents = 0;
1.233 djm 1916: /*
1917: * Only prepare to read if we can handle a full-size
1918: * input read buffer and enqueue a max size reply..
1919: */
1920: if ((r = sshbuf_check_reserve(sockets[i].input,
1921: AGENT_RBUF_LEN)) == 0 &&
1922: (r = sshbuf_check_reserve(sockets[i].output,
1.278 djm 1923: AGENT_MAX_LEN)) == 0)
1.233 djm 1924: pfd[j].events = POLLIN;
1.266 djm 1925: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1926: fatal_fr(r, "reserve");
1.194 markus 1927: if (sshbuf_len(sockets[i].output) > 0)
1.223 djm 1928: pfd[j].events |= POLLOUT;
1929: j++;
1.46 markus 1930: break;
1931: default:
1932: break;
1933: }
1934: }
1.155 dtucker 1935: deadline = reaper();
1936: if (parent_alive_interval != 0)
1937: deadline = (deadline == 0) ? parent_alive_interval :
1.214 deraadt 1938: MINIMUM(deadline, parent_alive_interval);
1.155 dtucker 1939: if (deadline == 0) {
1.224 djm 1940: *timeoutp = -1; /* INFTIM */
1.155 dtucker 1941: } else {
1.223 djm 1942: if (deadline > INT_MAX / 1000)
1943: *timeoutp = INT_MAX / 1000;
1944: else
1945: *timeoutp = deadline * 1000;
1.155 dtucker 1946: }
1.46 markus 1947: return (1);
1.21 markus 1948: }
1949:
1.55 itojun 1950: static void
1.113 markus 1951: cleanup_socket(void)
1.15 markus 1952: {
1.187 djm 1953: if (cleanup_pid != 0 && getpid() != cleanup_pid)
1954: return;
1.266 djm 1955: debug_f("cleanup");
1.48 deraadt 1956: if (socket_name[0])
1957: unlink(socket_name);
1958: if (socket_dir[0])
1959: rmdir(socket_dir);
1.10 markus 1960: }
1961:
1.114 markus 1962: void
1.15 markus 1963: cleanup_exit(int i)
1964: {
1.113 markus 1965: cleanup_socket();
1966: _exit(i);
1.15 markus 1967: }
1968:
1.135 deraadt 1969: /*ARGSUSED*/
1.55 itojun 1970: static void
1.48 deraadt 1971: cleanup_handler(int sig)
1972: {
1.113 markus 1973: cleanup_socket();
1.163 markus 1974: #ifdef ENABLE_PKCS11
1975: pkcs11_terminate();
1976: #endif
1.48 deraadt 1977: _exit(2);
1.113 markus 1978: }
1979:
1.68 markus 1980: static void
1.155 dtucker 1981: check_parent_exists(void)
1.68 markus 1982: {
1.172 dtucker 1983: /*
1984: * If our parent has exited then getppid() will return (pid_t)1,
1985: * so testing for that should be safe.
1986: */
1987: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1988: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1989: cleanup_socket();
1990: _exit(2);
1.68 markus 1991: }
1.48 deraadt 1992: }
1993:
1.55 itojun 1994: static void
1.50 itojun 1995: usage(void)
1.15 markus 1996: {
1.184 deraadt 1997: fprintf(stderr,
1.250 jmc 1998: "usage: ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]\n"
1.261 jmc 1999: " [-P allowed_providers] [-t life]\n"
1.260 djm 2000: " ssh-agent [-a bind_address] [-E fingerprint_hash] [-P allowed_providers]\n"
1.259 dtucker 2001: " [-t life] command [arg ...]\n"
1.250 jmc 2002: " ssh-agent [-c | -s] -k\n");
1.21 markus 2003: exit(1);
1.15 markus 2004: }
2005:
1.2 provos 2006: int
2007: main(int ac, char **av)
1.1 deraadt 2008: {
1.201 djm 2009: int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0;
1.265 djm 2010: int sock, ch, result, saved_errno;
1.96 deraadt 2011: char *shell, *format, *pidstr, *agentsocket = NULL;
1.41 markus 2012: struct rlimit rlim;
1.96 deraadt 2013: extern int optind;
1.98 stevesk 2014: extern char *optarg;
1.21 markus 2015: pid_t pid;
1.96 deraadt 2016: char pidstrbuf[1 + 3 * sizeof pid];
1.161 tobias 2017: size_t len;
1.189 djm 2018: mode_t prev_mask;
1.224 djm 2019: int timeout = -1; /* INFTIM */
1.223 djm 2020: struct pollfd *pfd = NULL;
2021: size_t npfd = 0;
1.231 djm 2022: u_int maxfds;
1.123 djm 2023:
2024: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
2025: sanitise_stdfd();
1.99 markus 2026:
2027: /* drop */
2028: setegid(getgid());
2029: setgid(getgid());
1.53 markus 2030:
1.231 djm 2031: if (getrlimit(RLIMIT_NOFILE, &rlim) == -1)
2032: fatal("%s: getrlimit: %s", __progname, strerror(errno));
2033:
1.185 markus 2034: #ifdef WITH_OPENSSL
1.170 djm 2035: OpenSSL_add_all_algorithms();
1.185 markus 2036: #endif
1.21 markus 2037:
1.258 djm 2038: while ((ch = getopt(ac, av, "cDdksE:a:O:P:t:")) != -1) {
1.21 markus 2039: switch (ch) {
1.192 djm 2040: case 'E':
2041: fingerprint_hash = ssh_digest_alg_by_name(optarg);
2042: if (fingerprint_hash == -1)
2043: fatal("Invalid hash algorithm \"%s\"", optarg);
2044: break;
1.21 markus 2045: case 'c':
2046: if (s_flag)
2047: usage();
2048: c_flag++;
2049: break;
2050: case 'k':
2051: k_flag++;
1.258 djm 2052: break;
2053: case 'O':
2054: if (strcmp(optarg, "no-restrict-websafe") == 0)
1.292.4.1! bluhm 2055: restrict_websafe = 0;
! 2056: else if (strcmp(optarg, "allow-remote-pkcs11") == 0)
! 2057: remote_add_provider = 1;
1.258 djm 2058: else
2059: fatal("Unknown -O option");
1.21 markus 2060: break;
1.215 djm 2061: case 'P':
1.260 djm 2062: if (allowed_providers != NULL)
1.215 djm 2063: fatal("-P option already specified");
1.260 djm 2064: allowed_providers = xstrdup(optarg);
1.215 djm 2065: break;
1.21 markus 2066: case 's':
2067: if (c_flag)
2068: usage();
2069: s_flag++;
2070: break;
1.57 markus 2071: case 'd':
1.201 djm 2072: if (d_flag || D_flag)
1.57 markus 2073: usage();
2074: d_flag++;
2075: break;
1.201 djm 2076: case 'D':
2077: if (d_flag || D_flag)
2078: usage();
2079: D_flag++;
2080: break;
1.86 markus 2081: case 'a':
2082: agentsocket = optarg;
1.106 marc 2083: break;
2084: case 't':
2085: if ((lifetime = convtime(optarg)) == -1) {
2086: fprintf(stderr, "Invalid lifetime\n");
2087: usage();
2088: }
1.86 markus 2089: break;
1.21 markus 2090: default:
2091: usage();
2092: }
2093: }
2094: ac -= optind;
2095: av += optind;
2096:
1.201 djm 2097: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag || D_flag))
1.21 markus 2098: usage();
2099:
1.260 djm 2100: if (allowed_providers == NULL)
1.262 djm 2101: allowed_providers = xstrdup(DEFAULT_ALLOWED_PROVIDERS);
1.215 djm 2102:
1.85 markus 2103: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 2104: shell = getenv("SHELL");
1.161 tobias 2105: if (shell != NULL && (len = strlen(shell)) > 2 &&
2106: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 2107: c_flag = 1;
2108: }
2109: if (k_flag) {
1.136 deraadt 2110: const char *errstr = NULL;
2111:
1.21 markus 2112: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
2113: if (pidstr == NULL) {
2114: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 2115: SSH_AGENTPID_ENV_NAME);
1.21 markus 2116: exit(1);
2117: }
1.136 deraadt 2118: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
2119: if (errstr) {
2120: fprintf(stderr,
2121: "%s=\"%s\", which is not a good PID: %s\n",
2122: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 2123: exit(1);
2124: }
2125: if (kill(pid, SIGTERM) == -1) {
2126: perror("kill");
2127: exit(1);
2128: }
2129: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 2130: printf(format, SSH_AUTHSOCKET_ENV_NAME);
2131: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 2132: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 2133: exit(0);
2134: }
1.231 djm 2135:
2136: /*
2137: * Minimum file descriptors:
2138: * stdio (3) + listener (1) + syslog (1 maybe) + connection (1) +
2139: * a few spare for libc / stack protectors / sanitisers, etc.
2140: */
2141: #define SSH_AGENT_MIN_FDS (3+1+1+1+4)
2142: if (rlim.rlim_cur < SSH_AGENT_MIN_FDS)
1.232 djm 2143: fatal("%s: file descriptor rlimit %lld too low (minimum %u)",
1.231 djm 2144: __progname, (long long)rlim.rlim_cur, SSH_AGENT_MIN_FDS);
2145: maxfds = rlim.rlim_cur - SSH_AGENT_MIN_FDS;
2146:
1.21 markus 2147: parent_pid = getpid();
2148:
1.86 markus 2149: if (agentsocket == NULL) {
2150: /* Create private directory for agent socket */
1.171 djm 2151: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 2152: if (mkdtemp(socket_dir) == NULL) {
2153: perror("mkdtemp: private socket dir");
2154: exit(1);
2155: }
1.91 mpech 2156: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
2157: (long)parent_pid);
1.86 markus 2158: } else {
2159: /* Try to use specified agent socket */
2160: socket_dir[0] = '\0';
2161: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 2162: }
2163:
1.23 markus 2164: /*
2165: * Create socket early so it will exist before command gets run from
2166: * the parent.
2167: */
1.189 djm 2168: prev_mask = umask(0177);
1.188 millert 2169: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 2170: if (sock < 0) {
1.188 millert 2171: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 2172: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 2173: cleanup_exit(1);
2174: }
1.189 djm 2175: umask(prev_mask);
1.46 markus 2176:
1.23 markus 2177: /*
2178: * Fork, and have the parent execute the command, if any, or present
2179: * the socket data. The child continues as the authentication agent.
2180: */
1.201 djm 2181: if (D_flag || d_flag) {
2182: log_init(__progname,
2183: d_flag ? SYSLOG_LEVEL_DEBUG3 : SYSLOG_LEVEL_INFO,
2184: SYSLOG_FACILITY_AUTH, 1);
1.57 markus 2185: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
2186: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
2187: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 2188: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.210 dtucker 2189: fflush(stdout);
1.57 markus 2190: goto skip;
2191: }
1.21 markus 2192: pid = fork();
2193: if (pid == -1) {
2194: perror("fork");
1.81 stevesk 2195: cleanup_exit(1);
1.21 markus 2196: }
2197: if (pid != 0) { /* Parent - execute the given command. */
2198: close(sock);
1.91 mpech 2199: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 2200: if (ac == 0) {
2201: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
2202: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 2203: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 2204: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 2205: SSH_AGENTPID_ENV_NAME);
1.91 mpech 2206: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 2207: exit(0);
2208: }
1.36 deraadt 2209: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
2210: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
2211: perror("setenv");
2212: exit(1);
2213: }
1.21 markus 2214: execvp(av[0], av);
2215: perror(av[0]);
2216: exit(1);
2217: }
1.81 stevesk 2218: /* child */
2219: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 2220:
2221: if (setsid() == -1) {
1.81 stevesk 2222: error("setsid: %s", strerror(errno));
1.67 stevesk 2223: cleanup_exit(1);
2224: }
2225:
2226: (void)chdir("/");
1.265 djm 2227: if (stdfd_devnull(1, 1, 1) == -1)
1.266 djm 2228: error_f("stdfd_devnull failed");
1.21 markus 2229:
1.41 markus 2230: /* deny core dumps, since memory contains unencrypted private keys */
2231: rlim.rlim_cur = rlim.rlim_max = 0;
1.237 deraadt 2232: if (setrlimit(RLIMIT_CORE, &rlim) == -1) {
1.81 stevesk 2233: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 2234: cleanup_exit(1);
2235: }
1.57 markus 2236:
2237: skip:
1.187 djm 2238:
2239: cleanup_pid = getpid();
1.163 markus 2240:
2241: #ifdef ENABLE_PKCS11
2242: pkcs11_init(0);
2243: #endif
1.21 markus 2244: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 2245: if (ac > 0)
2246: parent_alive_interval = 10;
1.33 markus 2247: idtab_init();
1.252 dtucker 2248: ssh_signal(SIGPIPE, SIG_IGN);
2249: ssh_signal(SIGINT, (d_flag | D_flag) ? cleanup_handler : SIG_IGN);
2250: ssh_signal(SIGHUP, cleanup_handler);
2251: ssh_signal(SIGTERM, cleanup_handler);
1.205 djm 2252:
1.215 djm 2253: if (pledge("stdio rpath cpath unix id proc exec", NULL) == -1)
1.205 djm 2254: fatal("%s: pledge: %s", __progname, strerror(errno));
1.66 markus 2255:
1.21 markus 2256: while (1) {
1.231 djm 2257: prepare_poll(&pfd, &npfd, &timeout, maxfds);
1.223 djm 2258: result = poll(pfd, npfd, timeout);
1.154 dtucker 2259: saved_errno = errno;
1.155 dtucker 2260: if (parent_alive_interval != 0)
2261: check_parent_exists();
2262: (void) reaper(); /* remove expired keys */
1.237 deraadt 2263: if (result == -1) {
1.154 dtucker 2264: if (saved_errno == EINTR)
1.21 markus 2265: continue;
1.223 djm 2266: fatal("poll: %s", strerror(saved_errno));
1.154 dtucker 2267: } else if (result > 0)
1.231 djm 2268: after_poll(pfd, npfd, maxfds);
1.15 markus 2269: }
1.21 markus 2270: /* NOTREACHED */
1.1 deraadt 2271: }
![[BACK]](/icons/back.gif){kind=icon}
Return to ssh-agent.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh