697 lines
16 KiB
C
697 lines
16 KiB
C
/*
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* Copyright (c) 1997 - 2005 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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RCSID("$Id: keytab_file.c 17457 2006-05-05 12:36:57Z lha $");
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#define KRB5_KT_VNO_1 1
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#define KRB5_KT_VNO_2 2
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#define KRB5_KT_VNO KRB5_KT_VNO_2
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#define KRB5_KT_FL_JAVA 1
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/* file operations -------------------------------------------- */
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struct fkt_data {
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char *filename;
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int flags;
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};
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static krb5_error_code
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krb5_kt_ret_data(krb5_context context,
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krb5_storage *sp,
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krb5_data *data)
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{
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int ret;
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int16_t size;
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ret = krb5_ret_int16(sp, &size);
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if(ret)
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return ret;
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data->length = size;
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data->data = malloc(size);
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if (data->data == NULL) {
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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ret = krb5_storage_read(sp, data->data, size);
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if(ret != size)
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return (ret < 0)? errno : KRB5_KT_END;
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return 0;
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}
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static krb5_error_code
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krb5_kt_ret_string(krb5_context context,
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krb5_storage *sp,
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heim_general_string *data)
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{
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int ret;
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int16_t size;
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ret = krb5_ret_int16(sp, &size);
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if(ret)
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return ret;
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*data = malloc(size + 1);
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if (*data == NULL) {
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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ret = krb5_storage_read(sp, *data, size);
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(*data)[size] = '\0';
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if(ret != size)
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return (ret < 0)? errno : KRB5_KT_END;
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return 0;
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}
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static krb5_error_code
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krb5_kt_store_data(krb5_context context,
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krb5_storage *sp,
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krb5_data data)
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{
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int ret;
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ret = krb5_store_int16(sp, data.length);
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if(ret < 0)
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return ret;
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ret = krb5_storage_write(sp, data.data, data.length);
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if(ret != data.length){
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if(ret < 0)
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return errno;
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return KRB5_KT_END;
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}
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return 0;
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}
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static krb5_error_code
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krb5_kt_store_string(krb5_storage *sp,
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heim_general_string data)
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{
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int ret;
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size_t len = strlen(data);
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ret = krb5_store_int16(sp, len);
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if(ret < 0)
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return ret;
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ret = krb5_storage_write(sp, data, len);
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if(ret != len){
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if(ret < 0)
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return errno;
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return KRB5_KT_END;
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}
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return 0;
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}
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static krb5_error_code
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krb5_kt_ret_keyblock(krb5_context context, krb5_storage *sp, krb5_keyblock *p)
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{
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int ret;
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int16_t tmp;
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ret = krb5_ret_int16(sp, &tmp); /* keytype + etype */
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if(ret) return ret;
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p->keytype = tmp;
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ret = krb5_kt_ret_data(context, sp, &p->keyvalue);
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return ret;
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}
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static krb5_error_code
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krb5_kt_store_keyblock(krb5_context context,
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krb5_storage *sp,
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krb5_keyblock *p)
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{
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int ret;
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ret = krb5_store_int16(sp, p->keytype); /* keytype + etype */
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if(ret) return ret;
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ret = krb5_kt_store_data(context, sp, p->keyvalue);
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return ret;
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}
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static krb5_error_code
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krb5_kt_ret_principal(krb5_context context,
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krb5_storage *sp,
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krb5_principal *princ)
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{
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int i;
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int ret;
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krb5_principal p;
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int16_t len;
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ALLOC(p, 1);
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if(p == NULL) {
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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ret = krb5_ret_int16(sp, &len);
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if(ret) {
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krb5_set_error_string(context,
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"Failed decoding length of keytab principal");
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goto out;
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}
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if(krb5_storage_is_flags(sp, KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS))
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len--;
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if (len < 0) {
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krb5_set_error_string(context,
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"Keytab principal contains invalid length");
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ret = KRB5_KT_END;
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goto out;
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}
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ret = krb5_kt_ret_string(context, sp, &p->realm);
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if(ret)
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goto out;
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p->name.name_string.val = calloc(len, sizeof(*p->name.name_string.val));
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if(p->name.name_string.val == NULL) {
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krb5_set_error_string (context, "malloc: out of memory");
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ret = ENOMEM;
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goto out;
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}
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p->name.name_string.len = len;
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for(i = 0; i < p->name.name_string.len; i++){
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ret = krb5_kt_ret_string(context, sp, p->name.name_string.val + i);
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if(ret)
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goto out;
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}
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if (krb5_storage_is_flags(sp, KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE))
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p->name.name_type = KRB5_NT_UNKNOWN;
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else {
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int32_t tmp32;
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ret = krb5_ret_int32(sp, &tmp32);
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p->name.name_type = tmp32;
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if (ret)
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goto out;
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}
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*princ = p;
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return 0;
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out:
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krb5_free_principal(context, p);
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return ret;
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}
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static krb5_error_code
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krb5_kt_store_principal(krb5_context context,
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krb5_storage *sp,
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krb5_principal p)
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{
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int i;
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int ret;
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if(krb5_storage_is_flags(sp, KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS))
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ret = krb5_store_int16(sp, p->name.name_string.len + 1);
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else
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ret = krb5_store_int16(sp, p->name.name_string.len);
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if(ret) return ret;
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ret = krb5_kt_store_string(sp, p->realm);
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if(ret) return ret;
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for(i = 0; i < p->name.name_string.len; i++){
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ret = krb5_kt_store_string(sp, p->name.name_string.val[i]);
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if(ret)
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return ret;
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}
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if(!krb5_storage_is_flags(sp, KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE)) {
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ret = krb5_store_int32(sp, p->name.name_type);
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if(ret)
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return ret;
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}
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return 0;
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}
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static krb5_error_code
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fkt_resolve(krb5_context context, const char *name, krb5_keytab id)
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{
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struct fkt_data *d;
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d = malloc(sizeof(*d));
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if(d == NULL) {
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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d->filename = strdup(name);
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if(d->filename == NULL) {
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free(d);
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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d->flags = 0;
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id->data = d;
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return 0;
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}
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static krb5_error_code
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fkt_resolve_java14(krb5_context context, const char *name, krb5_keytab id)
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{
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krb5_error_code ret;
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ret = fkt_resolve(context, name, id);
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if (ret == 0) {
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struct fkt_data *d = id->data;
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d->flags |= KRB5_KT_FL_JAVA;
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}
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return ret;
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}
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static krb5_error_code
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fkt_close(krb5_context context, krb5_keytab id)
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{
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struct fkt_data *d = id->data;
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free(d->filename);
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free(d);
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return 0;
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}
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static krb5_error_code
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fkt_get_name(krb5_context context,
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krb5_keytab id,
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char *name,
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size_t namesize)
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{
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/* This function is XXX */
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struct fkt_data *d = id->data;
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strlcpy(name, d->filename, namesize);
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return 0;
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}
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static void
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storage_set_flags(krb5_context context, krb5_storage *sp, int vno)
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{
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int flags = 0;
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switch(vno) {
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case KRB5_KT_VNO_1:
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flags |= KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS;
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flags |= KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE;
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flags |= KRB5_STORAGE_HOST_BYTEORDER;
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break;
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case KRB5_KT_VNO_2:
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break;
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default:
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krb5_warnx(context,
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"storage_set_flags called with bad vno (%d)", vno);
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}
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krb5_storage_set_flags(sp, flags);
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}
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static krb5_error_code
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fkt_start_seq_get_int(krb5_context context,
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krb5_keytab id,
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int flags,
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int exclusive,
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krb5_kt_cursor *c)
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{
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int8_t pvno, tag;
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krb5_error_code ret;
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struct fkt_data *d = id->data;
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c->fd = open (d->filename, flags);
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if (c->fd < 0) {
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ret = errno;
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krb5_set_error_string(context, "%s: %s", d->filename,
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strerror(ret));
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return ret;
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}
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ret = _krb5_xlock(context, c->fd, exclusive, d->filename);
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if (ret) {
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close(c->fd);
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return ret;
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}
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c->sp = krb5_storage_from_fd(c->fd);
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if (c->sp == NULL) {
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_krb5_xunlock(context, c->fd);
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close(c->fd);
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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krb5_storage_set_eof_code(c->sp, KRB5_KT_END);
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ret = krb5_ret_int8(c->sp, &pvno);
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if(ret) {
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krb5_storage_free(c->sp);
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_krb5_xunlock(context, c->fd);
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close(c->fd);
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krb5_clear_error_string(context);
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return ret;
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}
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if(pvno != 5) {
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krb5_storage_free(c->sp);
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_krb5_xunlock(context, c->fd);
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close(c->fd);
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krb5_clear_error_string (context);
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return KRB5_KEYTAB_BADVNO;
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}
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ret = krb5_ret_int8(c->sp, &tag);
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if (ret) {
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krb5_storage_free(c->sp);
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_krb5_xunlock(context, c->fd);
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close(c->fd);
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krb5_clear_error_string(context);
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return ret;
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}
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id->version = tag;
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storage_set_flags(context, c->sp, id->version);
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return 0;
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}
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static krb5_error_code
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fkt_start_seq_get(krb5_context context,
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krb5_keytab id,
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krb5_kt_cursor *c)
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{
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return fkt_start_seq_get_int(context, id, O_RDONLY | O_BINARY, 0, c);
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}
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static krb5_error_code
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fkt_next_entry_int(krb5_context context,
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krb5_keytab id,
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krb5_keytab_entry *entry,
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krb5_kt_cursor *cursor,
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off_t *start,
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off_t *end)
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{
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int32_t len;
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int ret;
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int8_t tmp8;
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int32_t tmp32;
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off_t pos, curpos;
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pos = krb5_storage_seek(cursor->sp, 0, SEEK_CUR);
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loop:
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ret = krb5_ret_int32(cursor->sp, &len);
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if (ret)
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return ret;
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if(len < 0) {
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pos = krb5_storage_seek(cursor->sp, -len, SEEK_CUR);
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goto loop;
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}
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ret = krb5_kt_ret_principal (context, cursor->sp, &entry->principal);
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if (ret)
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goto out;
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ret = krb5_ret_int32(cursor->sp, &tmp32);
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entry->timestamp = tmp32;
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if (ret)
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goto out;
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ret = krb5_ret_int8(cursor->sp, &tmp8);
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if (ret)
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goto out;
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entry->vno = tmp8;
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ret = krb5_kt_ret_keyblock (context, cursor->sp, &entry->keyblock);
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if (ret)
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goto out;
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/* there might be a 32 bit kvno here
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* if it's zero, assume that the 8bit one was right,
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* otherwise trust the new value */
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curpos = krb5_storage_seek(cursor->sp, 0, SEEK_CUR);
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if(len + 4 + pos - curpos >= 4) {
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ret = krb5_ret_int32(cursor->sp, &tmp32);
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if (ret == 0 && tmp32 != 0) {
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entry->vno = tmp32;
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}
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}
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if(start) *start = pos;
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if(end) *end = pos + 4 + len;
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out:
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krb5_storage_seek(cursor->sp, pos + 4 + len, SEEK_SET);
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return ret;
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}
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static krb5_error_code
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fkt_next_entry(krb5_context context,
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krb5_keytab id,
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krb5_keytab_entry *entry,
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krb5_kt_cursor *cursor)
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{
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return fkt_next_entry_int(context, id, entry, cursor, NULL, NULL);
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}
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static krb5_error_code
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fkt_end_seq_get(krb5_context context,
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krb5_keytab id,
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krb5_kt_cursor *cursor)
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{
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krb5_storage_free(cursor->sp);
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_krb5_xunlock(context, cursor->fd);
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close(cursor->fd);
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return 0;
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}
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static krb5_error_code
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fkt_setup_keytab(krb5_context context,
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krb5_keytab id,
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krb5_storage *sp)
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{
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krb5_error_code ret;
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ret = krb5_store_int8(sp, 5);
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if(ret)
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return ret;
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if(id->version == 0)
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id->version = KRB5_KT_VNO;
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return krb5_store_int8 (sp, id->version);
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}
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static krb5_error_code
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fkt_add_entry(krb5_context context,
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krb5_keytab id,
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krb5_keytab_entry *entry)
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{
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int ret;
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int fd;
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krb5_storage *sp;
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struct fkt_data *d = id->data;
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krb5_data keytab;
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int32_t len;
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fd = open (d->filename, O_RDWR | O_BINARY);
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if (fd < 0) {
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fd = open (d->filename, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0600);
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if (fd < 0) {
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ret = errno;
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krb5_set_error_string(context, "open(%s): %s", d->filename,
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strerror(ret));
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return ret;
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}
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ret = _krb5_xlock(context, fd, 1, d->filename);
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if (ret) {
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close(fd);
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return ret;
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}
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sp = krb5_storage_from_fd(fd);
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krb5_storage_set_eof_code(sp, KRB5_KT_END);
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ret = fkt_setup_keytab(context, id, sp);
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if(ret) {
|
|
goto out;
|
|
}
|
|
storage_set_flags(context, sp, id->version);
|
|
} else {
|
|
int8_t pvno, tag;
|
|
ret = _krb5_xlock(context, fd, 1, d->filename);
|
|
if (ret) {
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
sp = krb5_storage_from_fd(fd);
|
|
krb5_storage_set_eof_code(sp, KRB5_KT_END);
|
|
ret = krb5_ret_int8(sp, &pvno);
|
|
if(ret) {
|
|
/* we probably have a zero byte file, so try to set it up
|
|
properly */
|
|
ret = fkt_setup_keytab(context, id, sp);
|
|
if(ret) {
|
|
krb5_set_error_string(context, "%s: keytab is corrupted: %s",
|
|
d->filename, strerror(ret));
|
|
goto out;
|
|
}
|
|
storage_set_flags(context, sp, id->version);
|
|
} else {
|
|
if(pvno != 5) {
|
|
ret = KRB5_KEYTAB_BADVNO;
|
|
krb5_set_error_string(context, "%s: %s",
|
|
d->filename, strerror(ret));
|
|
goto out;
|
|
}
|
|
ret = krb5_ret_int8 (sp, &tag);
|
|
if (ret) {
|
|
krb5_set_error_string(context, "%s: reading tag: %s",
|
|
d->filename, strerror(ret));
|
|
goto out;
|
|
}
|
|
id->version = tag;
|
|
storage_set_flags(context, sp, id->version);
|
|
}
|
|
}
|
|
|
|
{
|
|
krb5_storage *emem;
|
|
emem = krb5_storage_emem();
|
|
if(emem == NULL) {
|
|
ret = ENOMEM;
|
|
krb5_set_error_string (context, "malloc: out of memory");
|
|
goto out;
|
|
}
|
|
ret = krb5_kt_store_principal(context, emem, entry->principal);
|
|
if(ret) {
|
|
krb5_storage_free(emem);
|
|
goto out;
|
|
}
|
|
ret = krb5_store_int32 (emem, entry->timestamp);
|
|
if(ret) {
|
|
krb5_storage_free(emem);
|
|
goto out;
|
|
}
|
|
ret = krb5_store_int8 (emem, entry->vno % 256);
|
|
if(ret) {
|
|
krb5_storage_free(emem);
|
|
goto out;
|
|
}
|
|
ret = krb5_kt_store_keyblock (context, emem, &entry->keyblock);
|
|
if(ret) {
|
|
krb5_storage_free(emem);
|
|
goto out;
|
|
}
|
|
if ((d->flags & KRB5_KT_FL_JAVA) == 0) {
|
|
ret = krb5_store_int32 (emem, entry->vno);
|
|
if (ret) {
|
|
krb5_storage_free(emem);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = krb5_storage_to_data(emem, &keytab);
|
|
krb5_storage_free(emem);
|
|
if(ret)
|
|
goto out;
|
|
}
|
|
|
|
while(1) {
|
|
ret = krb5_ret_int32(sp, &len);
|
|
if(ret == KRB5_KT_END) {
|
|
len = keytab.length;
|
|
break;
|
|
}
|
|
if(len < 0) {
|
|
len = -len;
|
|
if(len >= keytab.length) {
|
|
krb5_storage_seek(sp, -4, SEEK_CUR);
|
|
break;
|
|
}
|
|
}
|
|
krb5_storage_seek(sp, len, SEEK_CUR);
|
|
}
|
|
ret = krb5_store_int32(sp, len);
|
|
if(krb5_storage_write(sp, keytab.data, keytab.length) < 0)
|
|
ret = errno;
|
|
memset(keytab.data, 0, keytab.length);
|
|
krb5_data_free(&keytab);
|
|
out:
|
|
krb5_storage_free(sp);
|
|
_krb5_xunlock(context, fd);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
fkt_remove_entry(krb5_context context,
|
|
krb5_keytab id,
|
|
krb5_keytab_entry *entry)
|
|
{
|
|
krb5_keytab_entry e;
|
|
krb5_kt_cursor cursor;
|
|
off_t pos_start, pos_end;
|
|
int found = 0;
|
|
krb5_error_code ret;
|
|
|
|
ret = fkt_start_seq_get_int(context, id, O_RDWR | O_BINARY, 1, &cursor);
|
|
if(ret != 0)
|
|
goto out; /* return other error here? */
|
|
while(fkt_next_entry_int(context, id, &e, &cursor,
|
|
&pos_start, &pos_end) == 0) {
|
|
if(krb5_kt_compare(context, &e, entry->principal,
|
|
entry->vno, entry->keyblock.keytype)) {
|
|
int32_t len;
|
|
unsigned char buf[128];
|
|
found = 1;
|
|
krb5_storage_seek(cursor.sp, pos_start, SEEK_SET);
|
|
len = pos_end - pos_start - 4;
|
|
krb5_store_int32(cursor.sp, -len);
|
|
memset(buf, 0, sizeof(buf));
|
|
while(len > 0) {
|
|
krb5_storage_write(cursor.sp, buf, min(len, sizeof(buf)));
|
|
len -= min(len, sizeof(buf));
|
|
}
|
|
}
|
|
krb5_kt_free_entry(context, &e);
|
|
}
|
|
krb5_kt_end_seq_get(context, id, &cursor);
|
|
out:
|
|
if (!found) {
|
|
krb5_clear_error_string (context);
|
|
return KRB5_KT_NOTFOUND;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
const krb5_kt_ops krb5_fkt_ops = {
|
|
"FILE",
|
|
fkt_resolve,
|
|
fkt_get_name,
|
|
fkt_close,
|
|
NULL, /* get */
|
|
fkt_start_seq_get,
|
|
fkt_next_entry,
|
|
fkt_end_seq_get,
|
|
fkt_add_entry,
|
|
fkt_remove_entry
|
|
};
|
|
|
|
const krb5_kt_ops krb5_wrfkt_ops = {
|
|
"WRFILE",
|
|
fkt_resolve,
|
|
fkt_get_name,
|
|
fkt_close,
|
|
NULL, /* get */
|
|
fkt_start_seq_get,
|
|
fkt_next_entry,
|
|
fkt_end_seq_get,
|
|
fkt_add_entry,
|
|
fkt_remove_entry
|
|
};
|
|
|
|
const krb5_kt_ops krb5_javakt_ops = {
|
|
"JAVA14",
|
|
fkt_resolve_java14,
|
|
fkt_get_name,
|
|
fkt_close,
|
|
NULL, /* get */
|
|
fkt_start_seq_get,
|
|
fkt_next_entry,
|
|
fkt_end_seq_get,
|
|
fkt_add_entry,
|
|
fkt_remove_entry
|
|
};
|