1d9072f026
lib/krb5/crypto.c was a large, monolithic block of code which made it very difficult to selectively enable and disable particular alogrithms. Reorganise crypto.c into individual files for each encryption and salt time, and place the structures which tie everything together into their own file (crypto-algs.c) Add a non-installed library (librfc3961) and test program (test_rfc3961) which builds a minimal rfc3961 crypto library, and checks that it is usable.
305 lines
8.9 KiB
C
305 lines
8.9 KiB
C
/*
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* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_salttype_to_string (krb5_context context,
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krb5_enctype etype,
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krb5_salttype stype,
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char **string)
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{
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struct encryption_type *e;
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struct salt_type *st;
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e = _krb5_find_enctype (etype);
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if (e == NULL) {
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krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
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"encryption type %d not supported",
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etype);
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return KRB5_PROG_ETYPE_NOSUPP;
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}
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for (st = e->keytype->string_to_key; st && st->type; st++) {
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if (st->type == stype) {
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*string = strdup (st->name);
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if (*string == NULL) {
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krb5_set_error_message (context, ENOMEM,
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N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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return 0;
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}
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}
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krb5_set_error_message (context, HEIM_ERR_SALTTYPE_NOSUPP,
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"salttype %d not supported", stype);
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return HEIM_ERR_SALTTYPE_NOSUPP;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_string_to_salttype (krb5_context context,
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krb5_enctype etype,
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const char *string,
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krb5_salttype *salttype)
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{
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struct encryption_type *e;
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struct salt_type *st;
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e = _krb5_find_enctype (etype);
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if (e == NULL) {
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krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
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N_("encryption type %d not supported", ""),
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etype);
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return KRB5_PROG_ETYPE_NOSUPP;
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}
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for (st = e->keytype->string_to_key; st && st->type; st++) {
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if (strcasecmp (st->name, string) == 0) {
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*salttype = st->type;
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return 0;
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}
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}
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krb5_set_error_message(context, HEIM_ERR_SALTTYPE_NOSUPP,
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N_("salttype %s not supported", ""), string);
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return HEIM_ERR_SALTTYPE_NOSUPP;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_get_pw_salt(krb5_context context,
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krb5_const_principal principal,
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krb5_salt *salt)
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{
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size_t len;
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int i;
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krb5_error_code ret;
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char *p;
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salt->salttype = KRB5_PW_SALT;
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len = strlen(principal->realm);
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for (i = 0; i < principal->name.name_string.len; ++i)
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len += strlen(principal->name.name_string.val[i]);
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ret = krb5_data_alloc (&salt->saltvalue, len);
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if (ret)
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return ret;
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p = salt->saltvalue.data;
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memcpy (p, principal->realm, strlen(principal->realm));
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p += strlen(principal->realm);
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for (i = 0; i < principal->name.name_string.len; ++i) {
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memcpy (p,
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principal->name.name_string.val[i],
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strlen(principal->name.name_string.val[i]));
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p += strlen(principal->name.name_string.val[i]);
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}
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_free_salt(krb5_context context,
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krb5_salt salt)
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{
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krb5_data_free(&salt.saltvalue);
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_string_to_key_data (krb5_context context,
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krb5_enctype enctype,
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krb5_data password,
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krb5_principal principal,
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krb5_keyblock *key)
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{
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krb5_error_code ret;
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krb5_salt salt;
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ret = krb5_get_pw_salt(context, principal, &salt);
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if(ret)
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return ret;
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ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
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krb5_free_salt(context, salt);
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return ret;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_string_to_key (krb5_context context,
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krb5_enctype enctype,
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const char *password,
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krb5_principal principal,
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krb5_keyblock *key)
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{
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krb5_data pw;
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pw.data = rk_UNCONST(password);
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pw.length = strlen(password);
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return krb5_string_to_key_data(context, enctype, pw, principal, key);
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_string_to_key_data_salt (krb5_context context,
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krb5_enctype enctype,
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krb5_data password,
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krb5_salt salt,
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krb5_keyblock *key)
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{
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krb5_data opaque;
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krb5_data_zero(&opaque);
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return krb5_string_to_key_data_salt_opaque(context, enctype, password,
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salt, opaque, key);
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}
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/*
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* Do a string -> key for encryption type `enctype' operation on
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* `password' (with salt `salt' and the enctype specific data string
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* `opaque'), returning the resulting key in `key'
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*/
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_string_to_key_data_salt_opaque (krb5_context context,
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krb5_enctype enctype,
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krb5_data password,
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krb5_salt salt,
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krb5_data opaque,
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krb5_keyblock *key)
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{
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struct encryption_type *et =_krb5_find_enctype(enctype);
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struct salt_type *st;
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if(et == NULL) {
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krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
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N_("encryption type %d not supported", ""),
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enctype);
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return KRB5_PROG_ETYPE_NOSUPP;
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}
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for(st = et->keytype->string_to_key; st && st->type; st++)
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if(st->type == salt.salttype)
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return (*st->string_to_key)(context, enctype, password,
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salt, opaque, key);
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krb5_set_error_message(context, HEIM_ERR_SALTTYPE_NOSUPP,
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N_("salt type %d not supported", ""),
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salt.salttype);
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return HEIM_ERR_SALTTYPE_NOSUPP;
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}
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/*
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* Do a string -> key for encryption type `enctype' operation on the
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* string `password' (with salt `salt'), returning the resulting key
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* in `key'
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*/
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_string_to_key_salt (krb5_context context,
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krb5_enctype enctype,
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const char *password,
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krb5_salt salt,
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krb5_keyblock *key)
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{
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krb5_data pw;
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pw.data = rk_UNCONST(password);
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pw.length = strlen(password);
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return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_string_to_key_salt_opaque (krb5_context context,
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krb5_enctype enctype,
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const char *password,
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krb5_salt salt,
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krb5_data opaque,
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krb5_keyblock *key)
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{
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krb5_data pw;
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pw.data = rk_UNCONST(password);
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pw.length = strlen(password);
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return krb5_string_to_key_data_salt_opaque(context, enctype,
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pw, salt, opaque, key);
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_string_to_key_derived(krb5_context context,
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const void *str,
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size_t len,
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krb5_enctype etype,
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krb5_keyblock *key)
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{
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struct encryption_type *et = _krb5_find_enctype(etype);
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krb5_error_code ret;
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struct key_data kd;
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size_t keylen;
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u_char *tmp;
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if(et == NULL) {
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krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
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N_("encryption type %d not supported", ""),
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etype);
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return KRB5_PROG_ETYPE_NOSUPP;
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}
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keylen = et->keytype->bits / 8;
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ALLOC(kd.key, 1);
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if(kd.key == NULL) {
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krb5_set_error_message (context, ENOMEM,
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N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
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if(ret) {
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free(kd.key);
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return ret;
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}
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kd.key->keytype = etype;
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tmp = malloc (keylen);
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if(tmp == NULL) {
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krb5_free_keyblock(context, kd.key);
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krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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ret = _krb5_n_fold(str, len, tmp, keylen);
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if (ret) {
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free(tmp);
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krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
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return ret;
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}
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kd.schedule = NULL;
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_krb5_DES3_random_to_key(context, kd.key, tmp, keylen);
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memset(tmp, 0, keylen);
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free(tmp);
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ret = _krb5_derive_key(context,
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et,
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&kd,
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"kerberos", /* XXX well known constant */
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strlen("kerberos"));
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if (ret) {
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_krb5_free_key_data(context, &kd, et);
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return ret;
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}
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ret = krb5_copy_keyblock_contents(context, kd.key, key);
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_krb5_free_key_data(context, &kd, et);
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return ret;
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}
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