auth-passwd.c revision 65674
1/* 2 * Author: Tatu Ylonen <ylo@cs.hut.fi> 3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4 * All rights reserved 5 * Password authentication. This file contains the functions to check whether 6 * the password is valid for the user. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 * 14 * 15 * Copyright (c) 1999 Dug Song. All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * 38 * Copyright (c) 2000 Markus Friedl. All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 50 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 51 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 52 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 53 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 54 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 55 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 56 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 57 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 58 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 59 */ 60 61#include "includes.h" 62RCSID("$OpenBSD: auth-passwd.c,v 1.17 2000/09/07 20:27:49 deraadt Exp $"); 63RCSID("$FreeBSD: head/crypto/openssh/auth-passwd.c 65674 2000-09-10 09:35:38Z kris $"); 64 65#include "packet.h" 66#include "ssh.h" 67#include "servconf.h" 68#include "xmalloc.h" 69 70/* 71 * Tries to authenticate the user using password. Returns true if 72 * authentication succeeds. 73 */ 74int 75auth_password(struct passwd * pw, const char *password) 76{ 77 extern ServerOptions options; 78 char *encrypted_password; 79 80 /* deny if no user. */ 81 if (pw == NULL) 82 return 0; 83 if (pw->pw_uid == 0 && options.permit_root_login == 2) 84 return 0; 85 if (*password == '\0' && options.permit_empty_passwd == 0) 86 return 0; 87 88#ifdef SKEY 89 if (options.skey_authentication == 1) { 90 int ret = auth_skey_password(pw, password); 91 if (ret == 1 || ret == 0) 92 return ret; 93 /* Fall back to ordinary passwd authentication. */ 94 } 95#endif 96#ifdef KRB5 97 if (options.krb5_authentication == 1) { 98 if (auth_krb5_password(pw, password)) 99 return 1; 100 /* Fall back to ordinary passwd authentication. */ 101 } 102 103#endif /* KRB5 */ 104#ifdef KRB4 105 if (options.krb4_authentication == 1) { 106 int ret = auth_krb4_password(pw, password); 107 if (ret == 1 || ret == 0) 108 return ret; 109 /* Fall back to ordinary passwd authentication. */ 110 } 111#endif 112 113 /* Check for users with no password. */ 114 if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0) 115 return 1; 116 /* Encrypt the candidate password using the proper salt. */ 117 encrypted_password = crypt(password, 118 (pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx"); 119 120 /* Authentication is accepted if the encrypted passwords are identical. */ 121 return (strcmp(encrypted_password, pw->pw_passwd) == 0); 122} 123