1 /* $NetBSD: auth2-krb5.c,v 1.10 2022/02/23 19:07:20 christos Exp $ */ 2 /* 3 * Copyright (c) 2003 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 26 #include "includes.h" 27 __RCSID("$NetBSD: auth2-krb5.c,v 1.10 2022/02/23 19:07:20 christos Exp $"); 28 29 #include <krb5.h> 30 #include <stdio.h> 31 32 #include "ssh2.h" 33 #include "xmalloc.h" 34 #include "packet.h" 35 #include "log.h" 36 #include "hostfile.h" 37 #include "auth.h" 38 #ifdef GSSAPI 39 #include "ssh-gss.h" 40 #endif 41 #include "ssherr.h" 42 #include "monitor_wrap.h" 43 #include "misc.h" 44 #include "servconf.h" 45 46 /* import */ 47 extern ServerOptions options; 48 49 static int 50 userauth_kerberos(struct ssh *ssh, const char *method) 51 { 52 krb5_data tkt, reply; 53 size_t dlen; 54 char *passwd; 55 char *client = NULL; 56 int authenticated = 0, r; 57 58 if ((r = sshpkt_get_cstring(ssh, &passwd, &dlen)) != 0 || 59 (r = sshpkt_get_end(ssh)) != 0) 60 fatal("%s: %s", __func__, ssh_err(r)); 61 62 tkt.data = passwd; 63 tkt.length = dlen; 64 if (PRIVSEP(auth_krb5(ssh, &tkt, &client, &reply))) { 65 authenticated = 1; 66 if (reply.length) 67 free(reply.data); 68 } 69 if (client) 70 free(client); 71 free(tkt.data); 72 return (authenticated); 73 } 74 75 Authmethod method_kerberos = { 76 "kerberos-2@ssh.com", 77 NULL, 78 userauth_kerberos, 79 &options.kerberos_authentication 80 }; 81