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 #include "includes.h" 26 RCSID("$OpenBSD: auth2-none.c,v 1.6 2003/08/26 09:58:43 markus Exp $"); 27 28 #include "auth.h" 29 #include "xmalloc.h" 30 #include "packet.h" 31 #include "log.h" 32 #include "servconf.h" 33 #include "atomicio.h" 34 #include "compat.h" 35 #include "ssh2.h" 36 #include "monitor_wrap.h" 37 38 /* import */ 39 extern ServerOptions options; 40 41 /* "none" is allowed only one time */ 42 static int none_enabled = 1; 43 44 char * 45 auth2_read_banner(void) 46 { 47 struct stat st; 48 char *banner = NULL; 49 off_t len, n; 50 int fd; 51 52 if ((fd = open(options.banner, O_RDONLY)) == -1) 53 return (NULL); 54 if (fstat(fd, &st) == -1) { 55 close(fd); 56 return (NULL); 57 } 58 len = st.st_size; 59 banner = xmalloc(len + 1); 60 n = atomicio(read, fd, banner, len); 61 close(fd); 62 63 if (n != len) { 64 xfree(banner); 65 return (NULL); 66 } 67 banner[n] = '\0'; 68 69 return (banner); 70 } 71 72 static void 73 userauth_banner(void) 74 { 75 char *banner = NULL; 76 77 if (options.banner == NULL || (datafellows & SSH_BUG_BANNER)) 78 return; 79 80 if ((banner = PRIVSEP(auth2_read_banner())) == NULL) 81 goto done; 82 83 packet_start(SSH2_MSG_USERAUTH_BANNER); 84 packet_put_cstring(banner); 85 packet_put_cstring(""); /* language, unused */ 86 packet_send(); 87 debug("userauth_banner: sent"); 88 done: 89 if (banner) 90 xfree(banner); 91 } 92 93 static int 94 userauth_none(Authctxt *authctxt) 95 { 96 none_enabled = 0; 97 packet_check_eom(); 98 userauth_banner(); 99 #ifdef HAVE_CYGWIN 100 if (check_nt_auth(1, authctxt->pw) == 0) 101 return(0); 102 #endif 103 if (options.password_authentication) 104 return (PRIVSEP(auth_password(authctxt, ""))); 105 return (0); 106 } 107 108 Authmethod method_none = { 109 "none", 110 userauth_none, 111 &none_enabled 112 }; 113