1 /* $OpenBSD: auth2-none.c,v 1.25 2023/03/05 05:34:09 dtucker Exp $ */ 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 26 #include "includes.h" 27 28 #include <sys/types.h> 29 #include <sys/stat.h> 30 #include <sys/uio.h> 31 32 #include <fcntl.h> 33 #include <string.h> 34 #include <unistd.h> 35 #include <stdarg.h> 36 #include <stdio.h> 37 38 #include "atomicio.h" 39 #include "xmalloc.h" 40 #include "sshkey.h" 41 #include "hostfile.h" 42 #include "auth.h" 43 #include "packet.h" 44 #include "log.h" 45 #include "misc.h" 46 #include "servconf.h" 47 #include "ssh2.h" 48 #include "ssherr.h" 49 #ifdef GSSAPI 50 #include "ssh-gss.h" 51 #endif 52 #include "monitor_wrap.h" 53 54 /* import */ 55 extern ServerOptions options; 56 57 /* "none" is allowed only one time */ 58 static int none_enabled = 1; 59 60 static int 61 userauth_none(struct ssh *ssh, const char *method) 62 { 63 int r; 64 65 none_enabled = 0; 66 if ((r = sshpkt_get_end(ssh)) != 0) 67 fatal_fr(r, "parse packet"); 68 if (options.permit_empty_passwd && options.password_authentication) 69 return (PRIVSEP(auth_password(ssh, ""))); 70 return (0); 71 } 72 73 Authmethod method_none = { 74 "none", 75 NULL, 76 userauth_none, 77 &none_enabled 78 }; 79