1 /* 2 * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "headers.h" 35 36 krb5_context context; 37 38 static char *keyfile; 39 static int convert_flag; 40 static int help_flag; 41 static int version_flag; 42 43 static int master_key_fd = -1; 44 static int random_key_flag; 45 46 static const char *enctype_str = "des3-cbc-sha1"; 47 48 static struct getargs args[] = { 49 { "enctype", 'e', arg_string, rk_UNCONST(&enctype_str), "encryption type", 50 NULL }, 51 { "key-file", 'k', arg_string, &keyfile, "master key file", "file" }, 52 { "convert-file", 0, arg_flag, &convert_flag, 53 "just convert keyfile to new format", NULL }, 54 { "master-key-fd", 0, arg_integer, &master_key_fd, 55 "filedescriptor to read passphrase from", "fd" }, 56 { "random-key", 0, arg_flag, &random_key_flag, 57 "generate a random master key", NULL }, 58 { "help", 'h', arg_flag, &help_flag, NULL, NULL }, 59 { "version", 0, arg_flag, &version_flag, NULL, NULL } 60 }; 61 62 int num_args = sizeof(args) / sizeof(args[0]); 63 64 int 65 main(int argc, char **argv) 66 { 67 char buf[1024]; 68 krb5_error_code ret; 69 70 krb5_enctype enctype; 71 72 hdb_master_key mkey; 73 74 krb5_program_setup(&context, argc, argv, args, num_args, NULL); 75 76 if(help_flag) 77 krb5_std_usage(0, args, num_args); 78 if(version_flag){ 79 print_version(NULL); 80 exit(0); 81 } 82 83 if (master_key_fd != -1 && random_key_flag) 84 krb5_errx(context, 1, "random-key and master-key-fd " 85 "is mutual exclusive"); 86 87 if (keyfile == NULL) 88 asprintf(&keyfile, "%s/m-key", hdb_db_dir(context)); 89 90 ret = krb5_string_to_enctype(context, enctype_str, &enctype); 91 if(ret) 92 krb5_err(context, 1, ret, "krb5_string_to_enctype"); 93 94 ret = hdb_read_master_key(context, keyfile, &mkey); 95 if(ret && ret != ENOENT) 96 krb5_err(context, 1, ret, "reading master key from %s", keyfile); 97 98 if (convert_flag) { 99 if (ret) 100 krb5_err(context, 1, ret, "reading master key from %s", keyfile); 101 } else { 102 krb5_keyblock key; 103 krb5_salt salt; 104 salt.salttype = KRB5_PW_SALT; 105 /* XXX better value? */ 106 salt.saltvalue.data = NULL; 107 salt.saltvalue.length = 0; 108 if (random_key_flag) { 109 ret = krb5_generate_random_keyblock(context, enctype, &key); 110 if (ret) 111 krb5_err(context, 1, ret, "krb5_generate_random_keyblock"); 112 113 } else { 114 if(master_key_fd != -1) { 115 ssize_t n; 116 n = read(master_key_fd, buf, sizeof(buf)); 117 if(n <= 0) 118 krb5_err(context, 1, errno, "failed to read passphrase"); 119 buf[n] = '\0'; 120 buf[strcspn(buf, "\r\n")] = '\0'; 121 122 } else { 123 if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ", 1)) 124 exit(1); 125 } 126 krb5_string_to_key_salt(context, enctype, buf, salt, &key); 127 } 128 ret = hdb_add_master_key(context, &key, &mkey); 129 if (ret) 130 krb5_err(context, 1, ret, "hdb_add_master_key"); 131 132 krb5_free_keyblock_contents(context, &key); 133 134 } 135 136 { 137 char *new, *old; 138 asprintf(&old, "%s.old", keyfile); 139 asprintf(&new, "%s.new", keyfile); 140 if(unlink(new) < 0 && errno != ENOENT) { 141 ret = errno; 142 goto out; 143 } 144 krb5_warnx(context, "writing key to `%s'", keyfile); 145 ret = hdb_write_master_key(context, new, mkey); 146 if(ret) 147 unlink(new); 148 else { 149 #ifndef NO_POSIX_LINKS 150 unlink(old); 151 if(link(keyfile, old) < 0 && errno != ENOENT) { 152 ret = errno; 153 unlink(new); 154 } else { 155 #endif 156 if(rename(new, keyfile) < 0) { 157 ret = errno; 158 } 159 #ifndef NO_POSIX_LINKS 160 } 161 #endif 162 } 163 out: 164 free(old); 165 free(new); 166 if(ret) 167 krb5_warn(context, errno, "writing master key file"); 168 } 169 170 hdb_free_master_key(context, mkey); 171 172 exit(ret != 0); 173 } 174