Annotation of src/usr.bin/ssh/auth2-pubkey.c, Revision 1.37
1.37 ! djm 1: /* $OpenBSD: auth2-pubkey.c,v 1.36 2013/05/17 00:13:13 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24: */
25:
1.10 stevesk 26:
27: #include <sys/types.h>
28: #include <sys/stat.h>
1.31 djm 29: #include <sys/wait.h>
1.13 stevesk 30:
1.31 djm 31: #include <errno.h>
1.16 djm 32: #include <fcntl.h>
1.31 djm 33: #include <paths.h>
1.13 stevesk 34: #include <pwd.h>
1.31 djm 35: #include <signal.h>
1.14 stevesk 36: #include <stdio.h>
1.15 deraadt 37: #include <stdarg.h>
1.20 djm 38: #include <string.h>
39: #include <time.h>
1.17 dtucker 40: #include <unistd.h>
1.1 markus 41:
1.15 deraadt 42: #include "xmalloc.h"
1.8 dtucker 43: #include "ssh.h"
1.1 markus 44: #include "ssh2.h"
45: #include "packet.h"
46: #include "buffer.h"
47: #include "log.h"
48: #include "servconf.h"
49: #include "compat.h"
1.15 deraadt 50: #include "key.h"
51: #include "hostfile.h"
1.1 markus 52: #include "auth.h"
53: #include "pathnames.h"
54: #include "uidswap.h"
55: #include "auth-options.h"
56: #include "canohost.h"
1.15 deraadt 57: #ifdef GSSAPI
58: #include "ssh-gss.h"
59: #endif
1.1 markus 60: #include "monitor_wrap.h"
1.9 dtucker 61: #include "misc.h"
1.21 djm 62: #include "authfile.h"
1.24 djm 63: #include "match.h"
1.1 markus 64:
65: /* import */
66: extern ServerOptions options;
67: extern u_char *session_id2;
1.4 markus 68: extern u_int session_id2_len;
1.1 markus 69:
1.2 markus 70: static int
1.1 markus 71: userauth_pubkey(Authctxt *authctxt)
72: {
73: Buffer b;
74: Key *key = NULL;
1.35 djm 75: char *pkalg, *userstyle;
1.1 markus 76: u_char *pkblob, *sig;
77: u_int alen, blen, slen;
78: int have_sig, pktype;
79: int authenticated = 0;
80:
81: if (!authctxt->valid) {
82: debug2("userauth_pubkey: disabled because of invalid user");
83: return 0;
84: }
85: have_sig = packet_get_char();
86: if (datafellows & SSH_BUG_PKAUTH) {
87: debug2("userauth_pubkey: SSH_BUG_PKAUTH");
88: /* no explicit pkalg given */
89: pkblob = packet_get_string(&blen);
90: buffer_init(&b);
91: buffer_append(&b, pkblob, blen);
92: /* so we have to extract the pkalg from the pkblob */
93: pkalg = buffer_get_string(&b, &alen);
94: buffer_free(&b);
95: } else {
96: pkalg = packet_get_string(&alen);
97: pkblob = packet_get_string(&blen);
98: }
99: pktype = key_type_from_name(pkalg);
100: if (pktype == KEY_UNSPEC) {
101: /* this is perfectly legal */
1.3 itojun 102: logit("userauth_pubkey: unsupported public key algorithm: %s",
1.1 markus 103: pkalg);
104: goto done;
105: }
106: key = key_from_blob(pkblob, blen);
107: if (key == NULL) {
108: error("userauth_pubkey: cannot decode key: %s", pkalg);
109: goto done;
110: }
111: if (key->type != pktype) {
112: error("userauth_pubkey: type mismatch for decoded key "
113: "(received %d, expected %d)", key->type, pktype);
114: goto done;
115: }
116: if (have_sig) {
117: sig = packet_get_string(&slen);
118: packet_check_eom();
119: buffer_init(&b);
120: if (datafellows & SSH_OLD_SESSIONID) {
121: buffer_append(&b, session_id2, session_id2_len);
122: } else {
123: buffer_put_string(&b, session_id2, session_id2_len);
124: }
125: /* reconstruct packet */
126: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.35 djm 127: xasprintf(&userstyle, "%s%s%s", authctxt->user,
128: authctxt->style ? ":" : "",
129: authctxt->style ? authctxt->style : "");
130: buffer_put_cstring(&b, userstyle);
131: free(userstyle);
1.1 markus 132: buffer_put_cstring(&b,
133: datafellows & SSH_BUG_PKSERVICE ?
134: "ssh-userauth" :
135: authctxt->service);
136: if (datafellows & SSH_BUG_PKAUTH) {
137: buffer_put_char(&b, have_sig);
138: } else {
139: buffer_put_cstring(&b, "publickey");
140: buffer_put_char(&b, have_sig);
141: buffer_put_cstring(&b, pkalg);
142: }
143: buffer_put_string(&b, pkblob, blen);
144: #ifdef DEBUG_PK
145: buffer_dump(&b);
146: #endif
1.37 ! djm 147: pubkey_auth_info(authctxt, key);
! 148:
1.1 markus 149: /* test for correct signature */
150: authenticated = 0;
151: if (PRIVSEP(user_key_allowed(authctxt->pw, key)) &&
152: PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b),
1.6 markus 153: buffer_len(&b))) == 1)
1.1 markus 154: authenticated = 1;
1.6 markus 155: buffer_free(&b);
1.36 djm 156: free(sig);
1.1 markus 157: } else {
158: debug("test whether pkalg/pkblob are acceptable");
159: packet_check_eom();
160:
161: /* XXX fake reply and always send PK_OK ? */
162: /*
163: * XXX this allows testing whether a user is allowed
164: * to login: if you happen to have a valid pubkey this
165: * message is sent. the message is NEVER sent at all
166: * if a user is not allowed to login. is this an
167: * issue? -markus
168: */
169: if (PRIVSEP(user_key_allowed(authctxt->pw, key))) {
170: packet_start(SSH2_MSG_USERAUTH_PK_OK);
171: packet_put_string(pkalg, alen);
172: packet_put_string(pkblob, blen);
173: packet_send();
174: packet_write_wait();
175: authctxt->postponed = 1;
176: }
177: }
178: if (authenticated != 1)
179: auth_clear_options();
180: done:
181: debug2("userauth_pubkey: authenticated %d pkalg %s", authenticated, pkalg);
182: if (key != NULL)
183: key_free(key);
1.36 djm 184: free(pkalg);
185: free(pkblob);
1.1 markus 186: return authenticated;
187: }
188:
1.37 ! djm 189: void
! 190: pubkey_auth_info(Authctxt *authctxt, const Key *key)
! 191: {
! 192: char *fp;
! 193:
! 194: if (key_is_cert(key)) {
! 195: fp = key_fingerprint(key->cert->signature_key,
! 196: SSH_FP_MD5, SSH_FP_HEX);
! 197: auth_info(authctxt, "%s ID %s (serial %llu) CA %s %s",
! 198: key_type(key), key->cert->key_id,
! 199: (unsigned long long)key->cert->serial,
! 200: key_type(key->cert->signature_key), fp);
! 201: free(fp);
! 202: } else {
! 203: fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
! 204: auth_info(authctxt, "%s %s", key_type(key), fp);
! 205: free(fp);
! 206: }
! 207: }
! 208:
1.24 djm 209: static int
210: match_principals_option(const char *principal_list, struct KeyCert *cert)
211: {
212: char *result;
213: u_int i;
214:
215: /* XXX percent_expand() sequences for authorized_principals? */
216:
217: for (i = 0; i < cert->nprincipals; i++) {
218: if ((result = match_list(cert->principals[i],
219: principal_list, NULL)) != NULL) {
220: debug3("matched principal from key options \"%.100s\"",
221: result);
1.36 djm 222: free(result);
1.24 djm 223: return 1;
224: }
225: }
226: return 0;
227: }
228:
229: static int
1.26 djm 230: match_principals_file(char *file, struct passwd *pw, struct KeyCert *cert)
1.24 djm 231: {
232: FILE *f;
1.26 djm 233: char line[SSH_MAX_PUBKEY_BYTES], *cp, *ep, *line_opts;
1.24 djm 234: u_long linenum = 0;
235: u_int i;
236:
237: temporarily_use_uid(pw);
238: debug("trying authorized principals file %s", file);
239: if ((f = auth_openprincipals(file, pw, options.strict_modes)) == NULL) {
240: restore_uid();
241: return 0;
242: }
243: while (read_keyfile_line(f, file, line, sizeof(line), &linenum) != -1) {
1.26 djm 244: /* Skip leading whitespace. */
1.24 djm 245: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
246: ;
1.26 djm 247: /* Skip blank and comment lines. */
248: if ((ep = strchr(cp, '#')) != NULL)
249: *ep = '\0';
250: if (!*cp || *cp == '\n')
1.24 djm 251: continue;
1.26 djm 252: /* Trim trailing whitespace. */
253: ep = cp + strlen(cp) - 1;
254: while (ep > cp && (*ep == '\n' || *ep == ' ' || *ep == '\t'))
255: *ep-- = '\0';
256: /*
257: * If the line has internal whitespace then assume it has
258: * key options.
259: */
260: line_opts = NULL;
261: if ((ep = strrchr(cp, ' ')) != NULL ||
262: (ep = strrchr(cp, '\t')) != NULL) {
263: for (; *ep == ' ' || *ep == '\t'; ep++)
1.27 deraadt 264: ;
1.26 djm 265: line_opts = cp;
266: cp = ep;
267: }
1.24 djm 268: for (i = 0; i < cert->nprincipals; i++) {
269: if (strcmp(cp, cert->principals[i]) == 0) {
1.30 djm 270: debug3("matched principal \"%.100s\" "
271: "from file \"%s\" on line %lu",
1.31 djm 272: cert->principals[i], file, linenum);
1.26 djm 273: if (auth_parse_options(pw, line_opts,
274: file, linenum) != 1)
275: continue;
1.24 djm 276: fclose(f);
277: restore_uid();
278: return 1;
279: }
280: }
281: }
282: fclose(f);
283: restore_uid();
284: return 0;
1.31 djm 285: }
1.24 djm 286:
1.31 djm 287: /*
288: * Checks whether key is allowed in authorized_keys-format file,
289: * returns 1 if the key is allowed or 0 otherwise.
290: */
1.1 markus 291: static int
1.31 djm 292: check_authkeys_file(FILE *f, char *file, Key* key, struct passwd *pw)
1.1 markus 293: {
1.8 dtucker 294: char line[SSH_MAX_PUBKEY_BYTES];
1.20 djm 295: const char *reason;
1.18 dtucker 296: int found_key = 0;
1.1 markus 297: u_long linenum = 0;
298: Key *found;
299: char *fp;
300:
301: found_key = 0;
302:
1.37 ! djm 303: found = NULL;
1.8 dtucker 304: while (read_keyfile_line(f, file, line, sizeof(line), &linenum) != -1) {
1.7 avsm 305: char *cp, *key_options = NULL;
1.37 ! djm 306: if (found != NULL)
! 307: key_free(found);
! 308: found = key_new(key_is_cert(key) ? KEY_UNSPEC : key->type);
1.20 djm 309: auth_clear_options();
310:
1.1 markus 311: /* Skip leading whitespace, empty and comment lines. */
312: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
313: ;
314: if (!*cp || *cp == '\n' || *cp == '#')
315: continue;
316:
317: if (key_read(found, &cp) != 1) {
318: /* no key? check if there are options for this key */
319: int quoted = 0;
320: debug2("user_key_allowed: check options: '%s'", cp);
1.7 avsm 321: key_options = cp;
1.1 markus 322: for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) {
323: if (*cp == '\\' && cp[1] == '"')
324: cp++; /* Skip both */
325: else if (*cp == '"')
326: quoted = !quoted;
327: }
328: /* Skip remaining whitespace. */
329: for (; *cp == ' ' || *cp == '\t'; cp++)
330: ;
331: if (key_read(found, &cp) != 1) {
332: debug2("user_key_allowed: advance: '%s'", cp);
333: /* still no key? advance to next line*/
334: continue;
335: }
336: }
1.23 djm 337: if (key_is_cert(key)) {
1.25 djm 338: if (!key_equal(found, key->cert->signature_key))
339: continue;
340: if (auth_parse_options(pw, key_options, file,
341: linenum) != 1)
342: continue;
1.20 djm 343: if (!key_is_cert_authority)
344: continue;
345: fp = key_fingerprint(found, SSH_FP_MD5,
346: SSH_FP_HEX);
1.22 djm 347: debug("matching CA found: file %s, line %lu, %s %s",
348: file, linenum, key_type(found), fp);
1.24 djm 349: /*
350: * If the user has specified a list of principals as
351: * a key option, then prefer that list to matching
352: * their username in the certificate principals list.
353: */
354: if (authorized_principals != NULL &&
355: !match_principals_option(authorized_principals,
356: key->cert)) {
357: reason = "Certificate does not contain an "
358: "authorized principal";
359: fail_reason:
1.36 djm 360: free(fp);
1.20 djm 361: error("%s", reason);
362: auth_debug_add("%s", reason);
363: continue;
364: }
1.24 djm 365: if (key_cert_check_authority(key, 0, 0,
366: authorized_principals == NULL ? pw->pw_name : NULL,
367: &reason) != 0)
368: goto fail_reason;
1.23 djm 369: if (auth_cert_options(key, pw) != 0) {
1.36 djm 370: free(fp);
1.20 djm 371: continue;
1.22 djm 372: }
373: verbose("Accepted certificate ID \"%s\" "
374: "signed by %s CA %s via %s", key->cert->key_id,
375: key_type(found), fp, file);
1.36 djm 376: free(fp);
1.20 djm 377: found_key = 1;
378: break;
1.25 djm 379: } else if (key_equal(found, key)) {
380: if (auth_parse_options(pw, key_options, file,
381: linenum) != 1)
382: continue;
383: if (key_is_cert_authority)
384: continue;
1.1 markus 385: found_key = 1;
386: fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX);
1.37 ! djm 387: debug("matching key found: file %s, line %lu %s %s",
! 388: file, linenum, key_type(found), fp);
1.36 djm 389: free(fp);
1.1 markus 390: break;
391: }
392: }
1.37 ! djm 393: if (found != NULL)
! 394: key_free(found);
1.1 markus 395: if (!found_key)
396: debug2("key not found");
397: return found_key;
398: }
399:
1.21 djm 400: /* Authenticate a certificate key against TrustedUserCAKeys */
401: static int
402: user_cert_trusted_ca(struct passwd *pw, Key *key)
403: {
1.24 djm 404: char *ca_fp, *principals_file = NULL;
1.21 djm 405: const char *reason;
406: int ret = 0;
407:
408: if (!key_is_cert(key) || options.trusted_user_ca_keys == NULL)
409: return 0;
410:
1.22 djm 411: ca_fp = key_fingerprint(key->cert->signature_key,
412: SSH_FP_MD5, SSH_FP_HEX);
1.21 djm 413:
414: if (key_in_file(key->cert->signature_key,
415: options.trusted_user_ca_keys, 1) != 1) {
416: debug2("%s: CA %s %s is not listed in %s", __func__,
417: key_type(key->cert->signature_key), ca_fp,
418: options.trusted_user_ca_keys);
419: goto out;
420: }
1.24 djm 421: /*
422: * If AuthorizedPrincipals is in use, then compare the certificate
423: * principals against the names in that file rather than matching
424: * against the username.
425: */
426: if ((principals_file = authorized_principals_file(pw)) != NULL) {
427: if (!match_principals_file(principals_file, pw, key->cert)) {
428: reason = "Certificate does not contain an "
429: "authorized principal";
430: fail_reason:
431: error("%s", reason);
432: auth_debug_add("%s", reason);
433: goto out;
434: }
1.21 djm 435: }
1.24 djm 436: if (key_cert_check_authority(key, 0, 1,
437: principals_file == NULL ? pw->pw_name : NULL, &reason) != 0)
438: goto fail_reason;
1.23 djm 439: if (auth_cert_options(key, pw) != 0)
1.21 djm 440: goto out;
441:
1.22 djm 442: verbose("Accepted certificate ID \"%s\" signed by %s CA %s via %s",
443: key->cert->key_id, key_type(key->cert->signature_key), ca_fp,
444: options.trusted_user_ca_keys);
1.21 djm 445: ret = 1;
446:
447: out:
1.36 djm 448: free(principals_file);
449: free(ca_fp);
1.21 djm 450: return ret;
451: }
452:
1.31 djm 453: /*
454: * Checks whether key is allowed in file.
455: * returns 1 if the key is allowed or 0 otherwise.
456: */
457: static int
458: user_key_allowed2(struct passwd *pw, Key *key, char *file)
459: {
460: FILE *f;
461: int found_key = 0;
462:
463: /* Temporarily use the user's uid. */
464: temporarily_use_uid(pw);
465:
466: debug("trying public key file %s", file);
467: if ((f = auth_openkeyfile(file, pw, options.strict_modes)) != NULL) {
468: found_key = check_authkeys_file(f, file, key, pw);
469: fclose(f);
470: }
471:
472: restore_uid();
473: return found_key;
474: }
475:
476: /*
477: * Checks whether key is allowed in output of command.
478: * returns 1 if the key is allowed or 0 otherwise.
479: */
480: static int
481: user_key_command_allowed2(struct passwd *user_pw, Key *key)
482: {
483: FILE *f;
484: int ok, found_key = 0;
485: struct passwd *pw;
486: struct stat st;
487: int status, devnull, p[2], i;
488: pid_t pid;
1.32 djm 489: char *username, errmsg[512];
1.31 djm 490:
491: if (options.authorized_keys_command == NULL ||
492: options.authorized_keys_command[0] != '/')
493: return 0;
494:
1.32 djm 495: if (options.authorized_keys_command_user == NULL) {
496: error("No user for AuthorizedKeysCommand specified, skipping");
497: return 0;
498: }
499:
500: username = percent_expand(options.authorized_keys_command_user,
501: "u", user_pw->pw_name, (char *)NULL);
502: pw = getpwnam(username);
503: if (pw == NULL) {
1.34 djm 504: error("AuthorizedKeysCommandUser \"%s\" not found: %s",
505: username, strerror(errno));
1.32 djm 506: free(username);
507: return 0;
1.31 djm 508: }
1.32 djm 509: free(username);
1.31 djm 510:
511: temporarily_use_uid(pw);
512:
513: if (stat(options.authorized_keys_command, &st) < 0) {
514: error("Could not stat AuthorizedKeysCommand \"%s\": %s",
515: options.authorized_keys_command, strerror(errno));
516: goto out;
517: }
518: if (auth_secure_path(options.authorized_keys_command, &st, NULL, 0,
519: errmsg, sizeof(errmsg)) != 0) {
520: error("Unsafe AuthorizedKeysCommand: %s", errmsg);
521: goto out;
522: }
523:
524: if (pipe(p) != 0) {
525: error("%s: pipe: %s", __func__, strerror(errno));
526: goto out;
527: }
528:
1.33 djm 529: debug3("Running AuthorizedKeysCommand: \"%s %s\" as \"%s\"",
530: options.authorized_keys_command, user_pw->pw_name, pw->pw_name);
1.31 djm 531:
532: /*
533: * Don't want to call this in the child, where it can fatal() and
534: * run cleanup_exit() code.
535: */
536: restore_uid();
537:
538: switch ((pid = fork())) {
539: case -1: /* error */
540: error("%s: fork: %s", __func__, strerror(errno));
541: close(p[0]);
542: close(p[1]);
543: return 0;
544: case 0: /* child */
545: for (i = 0; i < NSIG; i++)
546: signal(i, SIG_DFL);
547:
1.33 djm 548: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
549: error("%s: open %s: %s", __func__, _PATH_DEVNULL,
550: strerror(errno));
551: _exit(1);
552: }
553: /* Keep stderr around a while longer to catch errors */
554: if (dup2(devnull, STDIN_FILENO) == -1 ||
555: dup2(p[1], STDOUT_FILENO) == -1) {
556: error("%s: dup2: %s", __func__, strerror(errno));
557: _exit(1);
558: }
1.32 djm 559: closefrom(STDERR_FILENO + 1);
1.33 djm 560:
1.31 djm 561: /* Don't use permanently_set_uid() here to avoid fatal() */
562: if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) {
563: error("setresgid %u: %s", (u_int)pw->pw_gid,
564: strerror(errno));
565: _exit(1);
566: }
567: if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) != 0) {
568: error("setresuid %u: %s", (u_int)pw->pw_uid,
569: strerror(errno));
570: _exit(1);
571: }
1.33 djm 572: /* stdin is pointed to /dev/null at this point */
573: if (dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
1.31 djm 574: error("%s: dup2: %s", __func__, strerror(errno));
575: _exit(1);
576: }
577:
578: execl(options.authorized_keys_command,
1.33 djm 579: options.authorized_keys_command, user_pw->pw_name, NULL);
1.31 djm 580:
581: error("AuthorizedKeysCommand %s exec failed: %s",
582: options.authorized_keys_command, strerror(errno));
583: _exit(127);
584: default: /* parent */
585: break;
586: }
587:
588: temporarily_use_uid(pw);
589:
590: close(p[1]);
591: if ((f = fdopen(p[0], "r")) == NULL) {
592: error("%s: fdopen: %s", __func__, strerror(errno));
593: close(p[0]);
594: /* Don't leave zombie child */
595: kill(pid, SIGTERM);
596: while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
597: ;
598: goto out;
599: }
600: ok = check_authkeys_file(f, options.authorized_keys_command, key, pw);
601: fclose(f);
602:
603: while (waitpid(pid, &status, 0) == -1) {
604: if (errno != EINTR) {
605: error("%s: waitpid: %s", __func__, strerror(errno));
606: goto out;
607: }
608: }
609: if (WIFSIGNALED(status)) {
610: error("AuthorizedKeysCommand %s exited on signal %d",
611: options.authorized_keys_command, WTERMSIG(status));
612: goto out;
613: } else if (WEXITSTATUS(status) != 0) {
614: error("AuthorizedKeysCommand %s returned status %d",
615: options.authorized_keys_command, WEXITSTATUS(status));
616: goto out;
617: }
618: found_key = ok;
619: out:
620: restore_uid();
621: return found_key;
622: }
623:
624: /*
625: * Check whether key authenticates and authorises the user.
626: */
1.1 markus 627: int
628: user_key_allowed(struct passwd *pw, Key *key)
629: {
1.29 djm 630: u_int success, i;
1.1 markus 631: char *file;
1.21 djm 632:
633: if (auth_key_is_revoked(key))
634: return 0;
635: if (key_is_cert(key) && auth_key_is_revoked(key->cert->signature_key))
636: return 0;
637:
638: success = user_cert_trusted_ca(pw, key);
639: if (success)
640: return success;
1.1 markus 641:
1.31 djm 642: success = user_key_command_allowed2(pw, key);
643: if (success > 0)
644: return success;
645:
1.29 djm 646: for (i = 0; !success && i < options.num_authkeys_files; i++) {
1.31 djm 647:
648: if (strcasecmp(options.authorized_keys_files[i], "none") == 0)
649: continue;
1.29 djm 650: file = expand_authorized_keys(
651: options.authorized_keys_files[i], pw);
1.31 djm 652:
1.29 djm 653: success = user_key_allowed2(pw, key, file);
1.36 djm 654: free(file);
1.29 djm 655: }
1.1 markus 656:
657: return success;
658: }
1.2 markus 659:
660: Authmethod method_pubkey = {
661: "publickey",
662: userauth_pubkey,
663: &options.pubkey_authentication
664: };
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