kdc/string2key.c

   1 /*
   2  * Copyright (c) 1997-2003 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 #include <getarg.h>
  36
  37 RCSID("$Id$");
  38
  39 int version5;
  40 int version4;
  41 int afs;
  42 char *principal;
  43 char *cell;
  44 char *password;
  45 const char *keytype_str = "des3-cbc-sha1";
  46 int version;
  47 int help;
  48
  49 struct getargs args[] = {
  50     { "version5", '5', arg_flag,   &version5, "Output Kerberos v5 string-to-key" },
  51     { "version4", '4', arg_flag,   &version4, "Output Kerberos v4 string-to-key" },
  52     { "afs",      'a', arg_flag,   &afs, "Output AFS string-to-key" },
  53     { "cell",     'c', arg_string, &cell, "AFS cell to use", "cell" },
  54     { "password", 'w', arg_string, &password, "Password to use", "password" },
  55     { "principal",'p', arg_string, &principal, "Kerberos v5 principal to use", "principal" },
  56     { "keytype",  'k', arg_string, &keytype_str, "Keytype" },
  57     { "version",    0, arg_flag,   &version, "print version" },
  58     { "help",       0, arg_flag,   &help, NULL }
  59 };
  60
  61 int num_args = sizeof(args) / sizeof(args[0]);
  62
  63 static void
  64 usage(int status)
  65 {
  66     arg_printusage (args, num_args, NULL, "password");
  67     exit(status);
  68 }
  69
  70 static void
  71 tokey(krb5_context context,
  72       krb5_enctype enctype,
  73       const char *pw,
  74       krb5_salt salt,
  75       const char *label)
  76 {
  77     krb5_error_code ret;
  78     int i;
  79     krb5_keyblock key;
  80     char *e;
  81
  82     ret = krb5_string_to_key_salt(context, enctype, pw, salt, &key);
  83     if (ret)
  84         krb5_err(context, 1, ret, "krb5_string_to_key_salt");
  85     ret = krb5_enctype_to_string(context, enctype, &e);
  86     if (ret)
  87         krb5_err(context, 1, ret, "krb5_enctype_to_string");
  88     printf(label, e);
  89     printf(": ");
  90     for(i = 0; i < key.keyvalue.length; i++)
  91         printf("%02x", ((unsigned char*)key.keyvalue.data)[i]);
  92     printf("\n");
  93     krb5_free_keyblock_contents(context, &key);
  94     free(e);
  95 }
  96
  97 int
  98 main(int argc, char **argv)
  99 {
 100     krb5_context context;
 101     krb5_principal princ;
 102     krb5_salt salt;
 103     int optidx;
 104     char buf[1024];
 105     krb5_enctype etype;
 106     krb5_error_code ret;
 107
 108     optidx = krb5_program_setup(&context, argc, argv, args, num_args, NULL);
 109
 110     if(help)
 111         usage(0);
 112
 113     if(version){
 114         print_version (NULL);
 115         return 0;
 116     }
 117
 118     argc -= optidx;
 119     argv += optidx;
 120
 121     if (argc > 1)
 122         usage(1);
 123
 124     if(!version5 && !version4 && !afs)
 125         version5 = 1;
 126
 127     ret = krb5_string_to_enctype(context, keytype_str, &etype);
 128     if(ret) {
 129         krb5_keytype keytype;
 130         int *etypes;
 131         unsigned num;
 132         char *str;
 133         ret = krb5_string_to_keytype(context, keytype_str, &keytype);
 134         if(ret)
 135             krb5_err(context, 1, ret, "%s", keytype_str);
 136         ret = krb5_keytype_to_enctypes(context, keytype, &num, &etypes);
 137         if(ret)
 138             krb5_err(context, 1, ret, "%s", keytype_str);
 139         if(num == 0)
 140             krb5_errx(context, 1, "there are no encryption types for that keytype");
 141         etype = etypes[0];
 142         krb5_enctype_to_string(context, etype, &str);
 143         keytype_str = str;
 144         if(num > 1 && version5)
 145             krb5_warnx(context, "ambiguous keytype, using %s", keytype_str);
 146     }
 147
 148     if((etype != ETYPE_DES_CBC_CRC &&
 149         etype != ETYPE_DES_CBC_MD4 &&
 150         etype != ETYPE_DES_CBC_MD5) &&
 151        (afs || version4)) {
 152         if(!version5) {
 153             etype = ETYPE_DES_CBC_CRC;
 154         } else {
 155             krb5_errx(context, 1,
 156                       "DES is the only valid keytype for AFS and Kerberos 4");
 157         }
 158     }
 159
 160     if(version5 && principal == NULL){
 161         printf("Kerberos v5 principal: ");
 162         if(fgets(buf, sizeof(buf), stdin) == NULL)
 163             return 1;
 164         buf[strcspn(buf, "\r\n")] = '\0';
 165         principal = estrdup(buf);
 166     }
 167     if(afs && cell == NULL){
 168         printf("AFS cell: ");
 169         if(fgets(buf, sizeof(buf), stdin) == NULL)
 170             return 1;
 171         buf[strcspn(buf, "\r\n")] = '\0';
 172         cell = estrdup(buf);
 173     }
 174     if(argv[0])
 175         password = argv[0];
 176     if(password == NULL){
 177         if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Password: ", 0))
 178             return 1;
 179         password = buf;
 180     }
 181
 182     if(version5){
 183         krb5_parse_name(context, principal, &princ);
 184         krb5_get_pw_salt(context, princ, &salt);
 185         tokey(context, etype, password, salt, "Kerberos 5 (%s)");
 186         krb5_free_salt(context, salt);
 187     }
 188     if(version4){
 189         salt.salttype = KRB5_PW_SALT;
 190         salt.saltvalue.length = 0;
 191         salt.saltvalue.data = NULL;
 192         tokey(context, ETYPE_DES_CBC_MD5, password, salt, "Kerberos 4");
 193     }
 194     if(afs){
 195         salt.salttype = KRB5_AFS3_SALT;
 196         salt.saltvalue.length = strlen(cell);
 197         salt.saltvalue.data = cell;
 198         tokey(context, ETYPE_DES_CBC_MD5, password, salt, "AFS");
 199     }
 200     return 0;
 201 }