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