1 /* 2 * Copyright (c) 2003 Ben Lindstrom. 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 27 #include <sys/types.h> 28 #include <string.h> 29 #include <unistd.h> 30 #include <pwd.h> 31 32 # if defined(HAVE_CRYPT_H) && !defined(HAVE_SECUREWARE) 33 # include <crypt.h> 34 # endif 35 36 # if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 37 # include <shadow.h> 38 # endif 39 40 # if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 41 # include <sys/label.h> 42 # include <sys/audit.h> 43 # include <pwdadj.h> 44 # endif 45 46 # if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) 47 # include "md5crypt.h" 48 # endif 49 50 # if defined(WITH_OPENSSL) && !defined(HAVE_CRYPT) && defined(HAVE_DES_CRYPT) 51 # include <openssl/des.h> 52 # define crypt DES_crypt 53 # endif 54 55 /* 56 * Pick an appropriate password encryption type and salt for the running 57 * system by searching through accounts until we find one that has a valid 58 * salt. Usually this will be root unless the root account is locked out. 59 * If we don't find one we return a traditional DES-based salt. 60 */ 61 static const char * 62 pick_salt(void) 63 { 64 struct passwd *pw; 65 char *passwd, *p; 66 size_t typelen; 67 static char salt[32]; 68 69 if (salt[0] != '\0') 70 return salt; 71 strlcpy(salt, "xx", sizeof(salt)); 72 setpwent(); 73 while ((pw = getpwent()) != NULL) { 74 if ((passwd = shadow_pw(pw)) == NULL) 75 continue; 76 if (passwd[0] == '$' && (p = strrchr(passwd+1, '$')) != NULL) { 77 typelen = p - passwd + 1; 78 strlcpy(salt, passwd, MIN(typelen, sizeof(salt))); 79 explicit_bzero(passwd, strlen(passwd)); 80 goto out; 81 } 82 } 83 out: 84 endpwent(); 85 return salt; 86 } 87 88 char * 89 xcrypt(const char *password, const char *salt) 90 { 91 char *crypted; 92 93 /* 94 * If we don't have a salt we are encrypting a fake password for 95 * for timing purposes. Pick an appropriate salt. 96 */ 97 if (salt == NULL) 98 salt = pick_salt(); 99 100 # ifdef HAVE_MD5_PASSWORDS 101 if (is_md5_salt(salt)) 102 crypted = md5_crypt(password, salt); 103 else 104 crypted = crypt(password, salt); 105 # else 106 crypted = crypt(password, salt); 107 # endif 108 109 return crypted; 110 } 111 112 /* 113 * Handle shadowed password systems in a cleaner way for portable 114 * version. 115 */ 116 117 char * 118 shadow_pw(struct passwd *pw) 119 { 120 char *pw_password = pw->pw_passwd; 121 122 # if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 123 struct spwd *spw = getspnam(pw->pw_name); 124 125 if (spw != NULL) 126 pw_password = spw->sp_pwdp; 127 # endif 128 129 # if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 130 struct passwd_adjunct *spw; 131 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) 132 pw_password = spw->pwa_passwd; 133 # endif 134 135 return pw_password; 136 } 137