526 lines
13 KiB
C
526 lines
13 KiB
C
/*
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* Copyright (c) 2000 - 2002 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 "hdb_locl.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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RCSID("$Id: mkey.c,v 1.15 2003/03/28 02:01:33 lha Exp $");
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struct hdb_master_key_data {
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krb5_keytab_entry keytab;
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krb5_crypto crypto;
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struct hdb_master_key_data *next;
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};
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void
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hdb_free_master_key(krb5_context context, hdb_master_key mkey)
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{
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struct hdb_master_key_data *ptr;
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while(mkey) {
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krb5_kt_free_entry(context, &mkey->keytab);
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if (mkey->crypto)
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krb5_crypto_destroy(context, mkey->crypto);
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ptr = mkey;
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mkey = mkey->next;
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free(ptr);
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}
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}
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krb5_error_code
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hdb_process_master_key(krb5_context context,
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int kvno, krb5_keyblock *key, krb5_enctype etype,
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hdb_master_key *mkey)
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{
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krb5_error_code ret;
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*mkey = calloc(1, sizeof(**mkey));
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if(*mkey == 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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(*mkey)->keytab.vno = kvno;
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ret = krb5_parse_name(context, "K/M", &(*mkey)->keytab.principal);
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if(ret)
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goto fail;
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ret = krb5_copy_keyblock_contents(context, key, &(*mkey)->keytab.keyblock);
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if(ret)
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goto fail;
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if(etype != 0)
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(*mkey)->keytab.keyblock.keytype = etype;
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(*mkey)->keytab.timestamp = time(NULL);
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ret = krb5_crypto_init(context, key, etype, &(*mkey)->crypto);
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if(ret)
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goto fail;
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return 0;
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fail:
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hdb_free_master_key(context, *mkey);
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*mkey = NULL;
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return ret;
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}
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krb5_error_code
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hdb_add_master_key(krb5_context context, krb5_keyblock *key,
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hdb_master_key *inout)
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{
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int vno = 0;
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hdb_master_key p;
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krb5_error_code ret;
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for(p = *inout; p; p = p->next)
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vno = max(vno, p->keytab.vno);
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vno++;
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ret = hdb_process_master_key(context, vno, key, 0, &p);
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if(ret)
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return ret;
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p->next = *inout;
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*inout = p;
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return 0;
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}
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static krb5_error_code
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read_master_keytab(krb5_context context, const char *filename,
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hdb_master_key *mkey)
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{
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krb5_error_code ret;
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krb5_keytab id;
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krb5_kt_cursor cursor;
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krb5_keytab_entry entry;
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hdb_master_key p;
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ret = krb5_kt_resolve(context, filename, &id);
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if(ret)
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return ret;
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ret = krb5_kt_start_seq_get(context, id, &cursor);
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if(ret)
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goto out;
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*mkey = NULL;
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while(krb5_kt_next_entry(context, id, &entry, &cursor) == 0) {
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p = calloc(1, sizeof(*p));
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p->keytab = entry;
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ret = krb5_crypto_init(context, &p->keytab.keyblock, 0, &p->crypto);
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p->next = *mkey;
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*mkey = p;
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}
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krb5_kt_end_seq_get(context, id, &cursor);
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out:
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krb5_kt_close(context, id);
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return ret;
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}
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/* read a MIT master keyfile */
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static krb5_error_code
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read_master_mit(krb5_context context, const char *filename,
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hdb_master_key *mkey)
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{
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int fd;
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krb5_error_code ret;
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krb5_storage *sp;
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u_int16_t enctype;
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krb5_keyblock key;
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fd = open(filename, O_RDONLY | O_BINARY);
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if(fd < 0) {
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int save_errno = errno;
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krb5_set_error_string(context, "failed to open %s: %s", filename,
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strerror(save_errno));
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return save_errno;
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}
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sp = krb5_storage_from_fd(fd);
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if(sp == NULL) {
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close(fd);
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return errno;
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}
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krb5_storage_set_flags(sp, KRB5_STORAGE_HOST_BYTEORDER);
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#if 0
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/* could possibly use ret_keyblock here, but do it with more
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checks for now */
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ret = krb5_ret_keyblock(sp, &key);
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#else
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ret = krb5_ret_int16(sp, &enctype);
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if((htons(enctype) & 0xff00) == 0x3000) {
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krb5_set_error_string(context, "unknown keytype in %s: %#x, expected %#x",
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filename, htons(enctype), 0x3000);
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ret = HEIM_ERR_BAD_MKEY;
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goto out;
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}
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key.keytype = enctype;
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ret = krb5_ret_data(sp, &key.keyvalue);
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if(ret)
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goto out;
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#endif
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ret = hdb_process_master_key(context, 0, &key, 0, mkey);
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krb5_free_keyblock_contents(context, &key);
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out:
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krb5_storage_free(sp);
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close(fd);
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return ret;
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}
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/* read an old master key file */
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static krb5_error_code
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read_master_encryptionkey(krb5_context context, const char *filename,
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hdb_master_key *mkey)
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{
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int fd;
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krb5_keyblock key;
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krb5_error_code ret;
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unsigned char buf[256];
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ssize_t len;
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size_t ret_len;
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fd = open(filename, O_RDONLY | O_BINARY);
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if(fd < 0) {
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int save_errno = errno;
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krb5_set_error_string(context, "failed to open %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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len = read(fd, buf, sizeof(buf));
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close(fd);
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if(len < 0) {
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int save_errno = errno;
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krb5_set_error_string(context, "error reading %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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ret = decode_EncryptionKey(buf, len, &key, &ret_len);
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memset(buf, 0, sizeof(buf));
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if(ret)
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return ret;
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/* Originally, the keytype was just that, and later it got changed
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to des-cbc-md5, but we always used des in cfb64 mode. This
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should cover all cases, but will break if someone has hacked
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this code to really use des-cbc-md5 -- but then that's not my
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problem. */
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if(key.keytype == KEYTYPE_DES || key.keytype == ETYPE_DES_CBC_MD5)
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key.keytype = ETYPE_DES_CFB64_NONE;
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ret = hdb_process_master_key(context, 0, &key, 0, mkey);
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krb5_free_keyblock_contents(context, &key);
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return ret;
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}
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/* read a krb4 /.k style file */
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static krb5_error_code
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read_master_krb4(krb5_context context, const char *filename,
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hdb_master_key *mkey)
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{
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int fd;
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krb5_keyblock key;
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krb5_error_code ret;
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unsigned char buf[256];
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ssize_t len;
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fd = open(filename, O_RDONLY | O_BINARY);
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if(fd < 0) {
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int save_errno = errno;
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krb5_set_error_string(context, "failed to open %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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len = read(fd, buf, sizeof(buf));
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close(fd);
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if(len < 0) {
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int save_errno = errno;
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krb5_set_error_string(context, "error reading %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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if(len != 8) {
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krb5_set_error_string(context, "bad contents of %s", filename);
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return HEIM_ERR_EOF; /* XXX file might be too large */
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}
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memset(&key, 0, sizeof(key));
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key.keytype = ETYPE_DES_PCBC_NONE;
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ret = krb5_data_copy(&key.keyvalue, buf, len);
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memset(buf, 0, sizeof(buf));
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if(ret)
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return ret;
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ret = hdb_process_master_key(context, 0, &key, 0, mkey);
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krb5_free_keyblock_contents(context, &key);
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return ret;
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}
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krb5_error_code
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hdb_read_master_key(krb5_context context, const char *filename,
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hdb_master_key *mkey)
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{
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FILE *f;
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unsigned char buf[16];
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krb5_error_code ret;
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off_t len;
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*mkey = NULL;
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if(filename == NULL)
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filename = HDB_DB_DIR "/m-key";
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f = fopen(filename, "r");
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if(f == NULL) {
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int save_errno = errno;
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krb5_set_error_string(context, "failed to open %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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if(fread(buf, 1, 2, f) != 2) {
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krb5_set_error_string(context, "end of file reading %s", filename);
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fclose(f);
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return HEIM_ERR_EOF;
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}
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fseek(f, 0, SEEK_END);
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len = ftell(f);
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if(fclose(f) != 0)
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return errno;
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if(len < 0)
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return errno;
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if(len == 8) {
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ret = read_master_krb4(context, filename, mkey);
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} else if(buf[0] == 0x30 && len <= 127 && buf[1] == len - 2) {
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ret = read_master_encryptionkey(context, filename, mkey);
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} else if(buf[0] == 5 && buf[1] >= 1 && buf[1] <= 2) {
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ret = read_master_keytab(context, filename, mkey);
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} else {
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ret = read_master_mit(context, filename, mkey);
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}
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return ret;
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}
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krb5_error_code
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hdb_write_master_key(krb5_context context, const char *filename,
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hdb_master_key mkey)
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{
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krb5_error_code ret;
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hdb_master_key p;
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krb5_keytab kt;
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if(filename == NULL)
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filename = HDB_DB_DIR "/m-key";
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ret = krb5_kt_resolve(context, filename, &kt);
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if(ret)
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return ret;
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for(p = mkey; p; p = p->next) {
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ret = krb5_kt_add_entry(context, kt, &p->keytab);
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}
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krb5_kt_close(context, kt);
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return ret;
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}
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static hdb_master_key
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find_master_key(Key *key, hdb_master_key mkey)
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{
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hdb_master_key ret = NULL;
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while(mkey) {
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if(ret == NULL && mkey->keytab.vno == 0)
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ret = mkey;
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if(key->mkvno == NULL) {
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if(ret == NULL || mkey->keytab.vno > ret->keytab.vno)
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ret = mkey;
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} else if(mkey->keytab.vno == *key->mkvno)
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return mkey;
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mkey = mkey->next;
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}
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return ret;
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}
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krb5_error_code
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hdb_unseal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
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{
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int i;
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krb5_error_code ret;
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krb5_data res;
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size_t keysize;
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Key *k;
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for(i = 0; i < ent->keys.len; i++){
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hdb_master_key key;
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k = &ent->keys.val[i];
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if(k->mkvno == NULL)
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continue;
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key = find_master_key(&ent->keys.val[i], mkey);
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if (key == NULL)
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return HDB_ERR_NO_MKEY;
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ret = krb5_decrypt(context, key->crypto, HDB_KU_MKEY,
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k->key.keyvalue.data,
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k->key.keyvalue.length,
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&res);
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if (ret)
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return ret;
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/* fixup keylength if the key got padded when encrypting it */
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ret = krb5_enctype_keysize(context, k->key.keytype, &keysize);
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if (ret) {
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krb5_data_free(&res);
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return ret;
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}
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if (keysize > res.length) {
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krb5_data_free(&res);
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return KRB5_BAD_KEYSIZE;
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}
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memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
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free(k->key.keyvalue.data);
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k->key.keyvalue = res;
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k->key.keyvalue.length = keysize;
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free(k->mkvno);
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k->mkvno = NULL;
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}
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return 0;
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}
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krb5_error_code
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hdb_unseal_keys(krb5_context context, HDB *db, hdb_entry *ent)
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{
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if (db->master_key_set == 0)
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return 0;
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return hdb_unseal_keys_mkey(context, ent, db->master_key);
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}
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krb5_error_code
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hdb_seal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
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{
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int i;
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krb5_error_code ret;
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krb5_data res;
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for(i = 0; i < ent->keys.len; i++){
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Key *k = &ent->keys.val[i];
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hdb_master_key key;
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if(k->mkvno != NULL)
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continue;
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key = find_master_key(k, mkey);
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if (key == NULL)
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return HDB_ERR_NO_MKEY;
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ret = krb5_encrypt(context, key->crypto, HDB_KU_MKEY,
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k->key.keyvalue.data,
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k->key.keyvalue.length,
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&res);
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if (ret)
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return ret;
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memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
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free(k->key.keyvalue.data);
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k->key.keyvalue = res;
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k->mkvno = malloc(sizeof(*k->mkvno));
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if (k->mkvno == NULL)
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return ENOMEM;
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*k->mkvno = key->keytab.vno;
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}
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return 0;
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}
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krb5_error_code
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hdb_seal_keys(krb5_context context, HDB *db, hdb_entry *ent)
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{
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if (db->master_key_set == 0)
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return 0;
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return hdb_seal_keys_mkey(context, ent, db->master_key);
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}
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krb5_error_code
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hdb_set_master_key (krb5_context context,
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HDB *db,
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krb5_keyblock *key)
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{
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krb5_error_code ret;
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hdb_master_key mkey;
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ret = hdb_process_master_key(context, 0, key, 0, &mkey);
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if (ret)
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return ret;
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db->master_key = mkey;
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#if 0 /* XXX - why? */
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des_set_random_generator_seed(key.keyvalue.data);
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#endif
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db->master_key_set = 1;
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return 0;
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}
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krb5_error_code
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hdb_set_master_keyfile (krb5_context context,
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HDB *db,
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const char *keyfile)
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{
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hdb_master_key key;
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krb5_error_code ret;
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ret = hdb_read_master_key(context, keyfile, &key);
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if (ret) {
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if (ret != ENOENT)
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return ret;
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krb5_clear_error_string(context);
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return 0;
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}
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db->master_key = key;
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db->master_key_set = 1;
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code
|
|
hdb_clear_master_key (krb5_context context,
|
|
HDB *db)
|
|
{
|
|
if (db->master_key_set) {
|
|
hdb_free_master_key(context, db->master_key);
|
|
db->master_key_set = 0;
|
|
}
|
|
return 0;
|
|
}
|