Annotation of src/usr.bin/ssh/auth2-pubkey.c, Revision 1.43
1.43 ! djm 1: /* $OpenBSD: auth2-pubkey.c,v 1.42 2014/12/04 02:24:32 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"
1.41 millert 48: #include "misc.h"
1.1 markus 49: #include "servconf.h"
50: #include "compat.h"
1.15 deraadt 51: #include "key.h"
52: #include "hostfile.h"
1.1 markus 53: #include "auth.h"
54: #include "pathnames.h"
55: #include "uidswap.h"
56: #include "auth-options.h"
57: #include "canohost.h"
1.15 deraadt 58: #ifdef GSSAPI
59: #include "ssh-gss.h"
60: #endif
1.1 markus 61: #include "monitor_wrap.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);
1.39 djm 114: goto done;
115: }
116: if (key_type_plain(key->type) == KEY_RSA &&
117: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
118: logit("Refusing RSA key because client uses unsafe "
119: "signature scheme");
1.1 markus 120: goto done;
121: }
122: if (have_sig) {
123: sig = packet_get_string(&slen);
124: packet_check_eom();
125: buffer_init(&b);
126: if (datafellows & SSH_OLD_SESSIONID) {
127: buffer_append(&b, session_id2, session_id2_len);
128: } else {
129: buffer_put_string(&b, session_id2, session_id2_len);
130: }
131: /* reconstruct packet */
132: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.35 djm 133: xasprintf(&userstyle, "%s%s%s", authctxt->user,
134: authctxt->style ? ":" : "",
135: authctxt->style ? authctxt->style : "");
136: buffer_put_cstring(&b, userstyle);
137: free(userstyle);
1.1 markus 138: buffer_put_cstring(&b,
139: datafellows & SSH_BUG_PKSERVICE ?
140: "ssh-userauth" :
141: authctxt->service);
142: if (datafellows & SSH_BUG_PKAUTH) {
143: buffer_put_char(&b, have_sig);
144: } else {
145: buffer_put_cstring(&b, "publickey");
146: buffer_put_char(&b, have_sig);
147: buffer_put_cstring(&b, pkalg);
148: }
149: buffer_put_string(&b, pkblob, blen);
150: #ifdef DEBUG_PK
151: buffer_dump(&b);
152: #endif
1.38 djm 153: pubkey_auth_info(authctxt, key, NULL);
1.37 djm 154:
1.1 markus 155: /* test for correct signature */
156: authenticated = 0;
157: if (PRIVSEP(user_key_allowed(authctxt->pw, key)) &&
158: PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b),
1.6 markus 159: buffer_len(&b))) == 1)
1.1 markus 160: authenticated = 1;
1.6 markus 161: buffer_free(&b);
1.36 djm 162: free(sig);
1.1 markus 163: } else {
164: debug("test whether pkalg/pkblob are acceptable");
165: packet_check_eom();
166:
167: /* XXX fake reply and always send PK_OK ? */
168: /*
169: * XXX this allows testing whether a user is allowed
170: * to login: if you happen to have a valid pubkey this
171: * message is sent. the message is NEVER sent at all
172: * if a user is not allowed to login. is this an
173: * issue? -markus
174: */
175: if (PRIVSEP(user_key_allowed(authctxt->pw, key))) {
176: packet_start(SSH2_MSG_USERAUTH_PK_OK);
177: packet_put_string(pkalg, alen);
178: packet_put_string(pkblob, blen);
179: packet_send();
180: packet_write_wait();
181: authctxt->postponed = 1;
182: }
183: }
184: if (authenticated != 1)
185: auth_clear_options();
186: done:
187: debug2("userauth_pubkey: authenticated %d pkalg %s", authenticated, pkalg);
188: if (key != NULL)
189: key_free(key);
1.36 djm 190: free(pkalg);
191: free(pkblob);
1.1 markus 192: return authenticated;
193: }
194:
1.37 djm 195: void
1.38 djm 196: pubkey_auth_info(Authctxt *authctxt, const Key *key, const char *fmt, ...)
1.37 djm 197: {
1.38 djm 198: char *fp, *extra;
199: va_list ap;
200: int i;
201:
202: extra = NULL;
203: if (fmt != NULL) {
204: va_start(ap, fmt);
205: i = vasprintf(&extra, fmt, ap);
206: va_end(ap);
207: if (i < 0 || extra == NULL)
208: fatal("%s: vasprintf failed", __func__);
209: }
1.37 djm 210:
211: if (key_is_cert(key)) {
212: fp = key_fingerprint(key->cert->signature_key,
1.43 ! djm 213: options.fingerprint_hash, SSH_FP_DEFAULT);
1.38 djm 214: auth_info(authctxt, "%s ID %s (serial %llu) CA %s %s%s%s",
1.37 djm 215: key_type(key), key->cert->key_id,
216: (unsigned long long)key->cert->serial,
1.38 djm 217: key_type(key->cert->signature_key), fp,
218: extra == NULL ? "" : ", ", extra == NULL ? "" : extra);
1.37 djm 219: free(fp);
220: } else {
1.43 ! djm 221: fp = key_fingerprint(key, options.fingerprint_hash,
! 222: SSH_FP_DEFAULT);
1.38 djm 223: auth_info(authctxt, "%s %s%s%s", key_type(key), fp,
224: extra == NULL ? "" : ", ", extra == NULL ? "" : extra);
1.37 djm 225: free(fp);
226: }
1.38 djm 227: free(extra);
1.37 djm 228: }
229:
1.24 djm 230: static int
1.40 djm 231: match_principals_option(const char *principal_list, struct sshkey_cert *cert)
1.24 djm 232: {
233: char *result;
234: u_int i;
235:
236: /* XXX percent_expand() sequences for authorized_principals? */
237:
238: for (i = 0; i < cert->nprincipals; i++) {
239: if ((result = match_list(cert->principals[i],
240: principal_list, NULL)) != NULL) {
241: debug3("matched principal from key options \"%.100s\"",
242: result);
1.36 djm 243: free(result);
1.24 djm 244: return 1;
245: }
246: }
247: return 0;
248: }
249:
250: static int
1.40 djm 251: match_principals_file(char *file, struct passwd *pw, struct sshkey_cert *cert)
1.24 djm 252: {
253: FILE *f;
1.26 djm 254: char line[SSH_MAX_PUBKEY_BYTES], *cp, *ep, *line_opts;
1.24 djm 255: u_long linenum = 0;
256: u_int i;
257:
258: temporarily_use_uid(pw);
259: debug("trying authorized principals file %s", file);
260: if ((f = auth_openprincipals(file, pw, options.strict_modes)) == NULL) {
261: restore_uid();
262: return 0;
263: }
264: while (read_keyfile_line(f, file, line, sizeof(line), &linenum) != -1) {
1.26 djm 265: /* Skip leading whitespace. */
1.24 djm 266: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
267: ;
1.26 djm 268: /* Skip blank and comment lines. */
269: if ((ep = strchr(cp, '#')) != NULL)
270: *ep = '\0';
271: if (!*cp || *cp == '\n')
1.24 djm 272: continue;
1.26 djm 273: /* Trim trailing whitespace. */
274: ep = cp + strlen(cp) - 1;
275: while (ep > cp && (*ep == '\n' || *ep == ' ' || *ep == '\t'))
276: *ep-- = '\0';
277: /*
278: * If the line has internal whitespace then assume it has
279: * key options.
280: */
281: line_opts = NULL;
282: if ((ep = strrchr(cp, ' ')) != NULL ||
283: (ep = strrchr(cp, '\t')) != NULL) {
284: for (; *ep == ' ' || *ep == '\t'; ep++)
1.27 deraadt 285: ;
1.26 djm 286: line_opts = cp;
287: cp = ep;
288: }
1.24 djm 289: for (i = 0; i < cert->nprincipals; i++) {
290: if (strcmp(cp, cert->principals[i]) == 0) {
1.30 djm 291: debug3("matched principal \"%.100s\" "
292: "from file \"%s\" on line %lu",
1.31 djm 293: cert->principals[i], file, linenum);
1.26 djm 294: if (auth_parse_options(pw, line_opts,
295: file, linenum) != 1)
296: continue;
1.24 djm 297: fclose(f);
298: restore_uid();
299: return 1;
300: }
301: }
302: }
303: fclose(f);
304: restore_uid();
305: return 0;
1.31 djm 306: }
1.24 djm 307:
1.31 djm 308: /*
309: * Checks whether key is allowed in authorized_keys-format file,
310: * returns 1 if the key is allowed or 0 otherwise.
311: */
1.1 markus 312: static int
1.31 djm 313: check_authkeys_file(FILE *f, char *file, Key* key, struct passwd *pw)
1.1 markus 314: {
1.8 dtucker 315: char line[SSH_MAX_PUBKEY_BYTES];
1.20 djm 316: const char *reason;
1.18 dtucker 317: int found_key = 0;
1.1 markus 318: u_long linenum = 0;
319: Key *found;
320: char *fp;
321:
322: found_key = 0;
323:
1.37 djm 324: found = NULL;
1.8 dtucker 325: while (read_keyfile_line(f, file, line, sizeof(line), &linenum) != -1) {
1.7 avsm 326: char *cp, *key_options = NULL;
1.37 djm 327: if (found != NULL)
328: key_free(found);
329: found = key_new(key_is_cert(key) ? KEY_UNSPEC : key->type);
1.20 djm 330: auth_clear_options();
331:
1.1 markus 332: /* Skip leading whitespace, empty and comment lines. */
333: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
334: ;
335: if (!*cp || *cp == '\n' || *cp == '#')
336: continue;
337:
338: if (key_read(found, &cp) != 1) {
339: /* no key? check if there are options for this key */
340: int quoted = 0;
341: debug2("user_key_allowed: check options: '%s'", cp);
1.7 avsm 342: key_options = cp;
1.1 markus 343: for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) {
344: if (*cp == '\\' && cp[1] == '"')
345: cp++; /* Skip both */
346: else if (*cp == '"')
347: quoted = !quoted;
348: }
349: /* Skip remaining whitespace. */
350: for (; *cp == ' ' || *cp == '\t'; cp++)
351: ;
352: if (key_read(found, &cp) != 1) {
353: debug2("user_key_allowed: advance: '%s'", cp);
354: /* still no key? advance to next line*/
355: continue;
356: }
357: }
1.23 djm 358: if (key_is_cert(key)) {
1.25 djm 359: if (!key_equal(found, key->cert->signature_key))
360: continue;
361: if (auth_parse_options(pw, key_options, file,
362: linenum) != 1)
363: continue;
1.20 djm 364: if (!key_is_cert_authority)
365: continue;
1.43 ! djm 366: fp = key_fingerprint(found, options.fingerprint_hash,
! 367: SSH_FP_DEFAULT);
1.22 djm 368: debug("matching CA found: file %s, line %lu, %s %s",
369: file, linenum, key_type(found), fp);
1.24 djm 370: /*
371: * If the user has specified a list of principals as
372: * a key option, then prefer that list to matching
373: * their username in the certificate principals list.
374: */
375: if (authorized_principals != NULL &&
376: !match_principals_option(authorized_principals,
377: key->cert)) {
378: reason = "Certificate does not contain an "
379: "authorized principal";
380: fail_reason:
1.36 djm 381: free(fp);
1.20 djm 382: error("%s", reason);
383: auth_debug_add("%s", reason);
384: continue;
385: }
1.24 djm 386: if (key_cert_check_authority(key, 0, 0,
387: authorized_principals == NULL ? pw->pw_name : NULL,
388: &reason) != 0)
389: goto fail_reason;
1.23 djm 390: if (auth_cert_options(key, pw) != 0) {
1.36 djm 391: free(fp);
1.20 djm 392: continue;
1.22 djm 393: }
394: verbose("Accepted certificate ID \"%s\" "
395: "signed by %s CA %s via %s", key->cert->key_id,
396: key_type(found), fp, file);
1.36 djm 397: free(fp);
1.20 djm 398: found_key = 1;
399: break;
1.25 djm 400: } else if (key_equal(found, key)) {
401: if (auth_parse_options(pw, key_options, file,
402: linenum) != 1)
403: continue;
404: if (key_is_cert_authority)
405: continue;
1.1 markus 406: found_key = 1;
1.43 ! djm 407: fp = key_fingerprint(found, options.fingerprint_hash,
! 408: SSH_FP_DEFAULT);
1.37 djm 409: debug("matching key found: file %s, line %lu %s %s",
410: file, linenum, key_type(found), fp);
1.36 djm 411: free(fp);
1.1 markus 412: break;
413: }
414: }
1.37 djm 415: if (found != NULL)
416: key_free(found);
1.1 markus 417: if (!found_key)
418: debug2("key not found");
419: return found_key;
420: }
421:
1.21 djm 422: /* Authenticate a certificate key against TrustedUserCAKeys */
423: static int
424: user_cert_trusted_ca(struct passwd *pw, Key *key)
425: {
1.24 djm 426: char *ca_fp, *principals_file = NULL;
1.21 djm 427: const char *reason;
428: int ret = 0;
429:
430: if (!key_is_cert(key) || options.trusted_user_ca_keys == NULL)
431: return 0;
432:
1.22 djm 433: ca_fp = key_fingerprint(key->cert->signature_key,
1.43 ! djm 434: options.fingerprint_hash, SSH_FP_DEFAULT);
1.21 djm 435:
1.42 djm 436: if (sshkey_in_file(key->cert->signature_key,
437: options.trusted_user_ca_keys, 1, 0) != 0) {
1.21 djm 438: debug2("%s: CA %s %s is not listed in %s", __func__,
439: key_type(key->cert->signature_key), ca_fp,
440: options.trusted_user_ca_keys);
441: goto out;
442: }
1.24 djm 443: /*
444: * If AuthorizedPrincipals is in use, then compare the certificate
445: * principals against the names in that file rather than matching
446: * against the username.
447: */
448: if ((principals_file = authorized_principals_file(pw)) != NULL) {
449: if (!match_principals_file(principals_file, pw, key->cert)) {
450: reason = "Certificate does not contain an "
451: "authorized principal";
452: fail_reason:
453: error("%s", reason);
454: auth_debug_add("%s", reason);
455: goto out;
456: }
1.21 djm 457: }
1.24 djm 458: if (key_cert_check_authority(key, 0, 1,
459: principals_file == NULL ? pw->pw_name : NULL, &reason) != 0)
460: goto fail_reason;
1.23 djm 461: if (auth_cert_options(key, pw) != 0)
1.21 djm 462: goto out;
463:
1.22 djm 464: verbose("Accepted certificate ID \"%s\" signed by %s CA %s via %s",
465: key->cert->key_id, key_type(key->cert->signature_key), ca_fp,
466: options.trusted_user_ca_keys);
1.21 djm 467: ret = 1;
468:
469: out:
1.36 djm 470: free(principals_file);
471: free(ca_fp);
1.21 djm 472: return ret;
473: }
474:
1.31 djm 475: /*
476: * Checks whether key is allowed in file.
477: * returns 1 if the key is allowed or 0 otherwise.
478: */
479: static int
480: user_key_allowed2(struct passwd *pw, Key *key, char *file)
481: {
482: FILE *f;
483: int found_key = 0;
484:
485: /* Temporarily use the user's uid. */
486: temporarily_use_uid(pw);
487:
488: debug("trying public key file %s", file);
489: if ((f = auth_openkeyfile(file, pw, options.strict_modes)) != NULL) {
490: found_key = check_authkeys_file(f, file, key, pw);
491: fclose(f);
492: }
493:
494: restore_uid();
495: return found_key;
496: }
497:
498: /*
499: * Checks whether key is allowed in output of command.
500: * returns 1 if the key is allowed or 0 otherwise.
501: */
502: static int
503: user_key_command_allowed2(struct passwd *user_pw, Key *key)
504: {
505: FILE *f;
506: int ok, found_key = 0;
507: struct passwd *pw;
508: struct stat st;
509: int status, devnull, p[2], i;
510: pid_t pid;
1.32 djm 511: char *username, errmsg[512];
1.31 djm 512:
513: if (options.authorized_keys_command == NULL ||
514: options.authorized_keys_command[0] != '/')
515: return 0;
516:
1.32 djm 517: if (options.authorized_keys_command_user == NULL) {
518: error("No user for AuthorizedKeysCommand specified, skipping");
519: return 0;
520: }
521:
522: username = percent_expand(options.authorized_keys_command_user,
523: "u", user_pw->pw_name, (char *)NULL);
524: pw = getpwnam(username);
525: if (pw == NULL) {
1.34 djm 526: error("AuthorizedKeysCommandUser \"%s\" not found: %s",
527: username, strerror(errno));
1.32 djm 528: free(username);
529: return 0;
1.31 djm 530: }
1.32 djm 531: free(username);
1.31 djm 532:
533: temporarily_use_uid(pw);
534:
535: if (stat(options.authorized_keys_command, &st) < 0) {
536: error("Could not stat AuthorizedKeysCommand \"%s\": %s",
537: options.authorized_keys_command, strerror(errno));
538: goto out;
539: }
540: if (auth_secure_path(options.authorized_keys_command, &st, NULL, 0,
541: errmsg, sizeof(errmsg)) != 0) {
542: error("Unsafe AuthorizedKeysCommand: %s", errmsg);
543: goto out;
544: }
545:
546: if (pipe(p) != 0) {
547: error("%s: pipe: %s", __func__, strerror(errno));
548: goto out;
549: }
550:
1.33 djm 551: debug3("Running AuthorizedKeysCommand: \"%s %s\" as \"%s\"",
552: options.authorized_keys_command, user_pw->pw_name, pw->pw_name);
1.31 djm 553:
554: /*
555: * Don't want to call this in the child, where it can fatal() and
556: * run cleanup_exit() code.
557: */
558: restore_uid();
559:
560: switch ((pid = fork())) {
561: case -1: /* error */
562: error("%s: fork: %s", __func__, strerror(errno));
563: close(p[0]);
564: close(p[1]);
565: return 0;
566: case 0: /* child */
567: for (i = 0; i < NSIG; i++)
568: signal(i, SIG_DFL);
569:
1.33 djm 570: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
571: error("%s: open %s: %s", __func__, _PATH_DEVNULL,
572: strerror(errno));
573: _exit(1);
574: }
575: /* Keep stderr around a while longer to catch errors */
576: if (dup2(devnull, STDIN_FILENO) == -1 ||
577: dup2(p[1], STDOUT_FILENO) == -1) {
578: error("%s: dup2: %s", __func__, strerror(errno));
579: _exit(1);
580: }
1.32 djm 581: closefrom(STDERR_FILENO + 1);
1.33 djm 582:
1.31 djm 583: /* Don't use permanently_set_uid() here to avoid fatal() */
584: if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) {
585: error("setresgid %u: %s", (u_int)pw->pw_gid,
586: strerror(errno));
587: _exit(1);
588: }
589: if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) != 0) {
590: error("setresuid %u: %s", (u_int)pw->pw_uid,
591: strerror(errno));
592: _exit(1);
593: }
1.33 djm 594: /* stdin is pointed to /dev/null at this point */
595: if (dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
1.31 djm 596: error("%s: dup2: %s", __func__, strerror(errno));
597: _exit(1);
598: }
599:
600: execl(options.authorized_keys_command,
1.33 djm 601: options.authorized_keys_command, user_pw->pw_name, NULL);
1.31 djm 602:
603: error("AuthorizedKeysCommand %s exec failed: %s",
604: options.authorized_keys_command, strerror(errno));
605: _exit(127);
606: default: /* parent */
607: break;
608: }
609:
610: temporarily_use_uid(pw);
611:
612: close(p[1]);
613: if ((f = fdopen(p[0], "r")) == NULL) {
614: error("%s: fdopen: %s", __func__, strerror(errno));
615: close(p[0]);
616: /* Don't leave zombie child */
617: kill(pid, SIGTERM);
618: while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
619: ;
620: goto out;
621: }
622: ok = check_authkeys_file(f, options.authorized_keys_command, key, pw);
623: fclose(f);
624:
625: while (waitpid(pid, &status, 0) == -1) {
626: if (errno != EINTR) {
627: error("%s: waitpid: %s", __func__, strerror(errno));
628: goto out;
629: }
630: }
631: if (WIFSIGNALED(status)) {
632: error("AuthorizedKeysCommand %s exited on signal %d",
633: options.authorized_keys_command, WTERMSIG(status));
634: goto out;
635: } else if (WEXITSTATUS(status) != 0) {
636: error("AuthorizedKeysCommand %s returned status %d",
637: options.authorized_keys_command, WEXITSTATUS(status));
638: goto out;
639: }
640: found_key = ok;
641: out:
642: restore_uid();
643: return found_key;
644: }
645:
646: /*
647: * Check whether key authenticates and authorises the user.
648: */
1.1 markus 649: int
650: user_key_allowed(struct passwd *pw, Key *key)
651: {
1.29 djm 652: u_int success, i;
1.1 markus 653: char *file;
1.21 djm 654:
655: if (auth_key_is_revoked(key))
656: return 0;
657: if (key_is_cert(key) && auth_key_is_revoked(key->cert->signature_key))
658: return 0;
659:
660: success = user_cert_trusted_ca(pw, key);
661: if (success)
662: return success;
1.1 markus 663:
1.31 djm 664: success = user_key_command_allowed2(pw, key);
665: if (success > 0)
666: return success;
667:
1.29 djm 668: for (i = 0; !success && i < options.num_authkeys_files; i++) {
1.31 djm 669:
670: if (strcasecmp(options.authorized_keys_files[i], "none") == 0)
671: continue;
1.29 djm 672: file = expand_authorized_keys(
673: options.authorized_keys_files[i], pw);
1.31 djm 674:
1.29 djm 675: success = user_key_allowed2(pw, key, file);
1.36 djm 676: free(file);
1.29 djm 677: }
1.1 markus 678:
679: return success;
680: }
1.2 markus 681:
682: Authmethod method_pubkey = {
683: "publickey",
684: userauth_pubkey,
685: &options.pubkey_authentication
686: };
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