1 /* 2 * Copyright (c) 2000 Markus Friedl. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 /* 25 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #include "includes.h" 30 RCSID("$OpenBSD: auth2-none.c,v 1.4 2002/06/27 10:35:47 deraadt Exp $"); 31 32 #pragma ident "%Z%%M% %I% %E% SMI" 33 34 #include "auth.h" 35 #include "xmalloc.h" 36 #include "packet.h" 37 #include "log.h" 38 #include "servconf.h" 39 #include "atomicio.h" 40 #include "compat.h" 41 #include "ssh2.h" 42 43 /* import */ 44 extern ServerOptions options; 45 46 /* "none" is allowed only one time */ 47 static int none_enabled = 1; 48 49 char * 50 auth2_read_banner(void) 51 { 52 struct stat st; 53 char *banner = NULL; 54 off_t len, n; 55 int fd; 56 57 if ((fd = open(options.banner, O_RDONLY)) == -1) 58 return (NULL); 59 if (fstat(fd, &st) == -1) { 60 close(fd); 61 return (NULL); 62 } 63 len = st.st_size; 64 banner = xmalloc(len + 1); 65 n = atomicio(read, fd, banner, len); 66 close(fd); 67 68 if (n != len) { 69 xfree(banner); 70 return (NULL); 71 } 72 banner[n] = '\0'; 73 74 return (banner); 75 } 76 77 static void 78 userauth_banner(void) 79 { 80 char *banner = NULL; 81 82 if (options.banner == NULL || (datafellows & SSH_BUG_BANNER)) 83 return; 84 85 if ((banner = auth2_read_banner()) == NULL) 86 goto done; 87 88 packet_start(SSH2_MSG_USERAUTH_BANNER); 89 packet_put_cstring(banner); 90 packet_put_cstring(""); /* language, unused */ 91 packet_send(); 92 debug("userauth_banner: sent"); 93 done: 94 if (banner) 95 xfree(banner); 96 } 97 98 static void 99 userauth_none(Authctxt *authctxt) 100 { 101 none_enabled = 0; 102 103 if (!authctxt || !authctxt->method) 104 fatal("%s: missing context", __func__); 105 106 packet_check_eom(); 107 userauth_banner(); 108 #ifdef HAVE_CYGWIN 109 if (check_nt_auth(1, authctxt->pw) == 0) 110 return(0); 111 #endif 112 authctxt->method->authenticated = auth_password(authctxt, ""); 113 } 114 115 Authmethod method_none = { 116 "none", 117 &none_enabled, 118 userauth_none, 119 NULL, /* no abandon function */ 120 NULL, NULL, /* method data and hist data */ 121 0, /* not really initial userauth */ 122 0, 0, 0, /* counters */ 123 0, 0, 0, 0, 0, 0 /* state */ 124 }; 125