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samba-mirror/lib/krb5_wrap/keytab_util.c
2012-08-29 23:46:17 +02:00

259 lines
7.2 KiB
C

/*
* Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* Copyright (c) 2011 Andrew Bartlett
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "includes.h"
#include "krb5_samba.h"
static krb5_boolean
compare_keyblock(const krb5_keyblock *a, const krb5_keyblock *b)
{
if (KRB5_KEY_TYPE(a) != KRB5_KEY_TYPE(b) ||
KRB5_KEY_LENGTH(a) != KRB5_KEY_LENGTH(b) ||
memcmp(KRB5_KEY_DATA(a), KRB5_KEY_DATA(b), KRB5_KEY_LENGTH(a)) != 0)
return false;
return true;
}
static krb5_error_code copy_one_entry(krb5_context context,
krb5_keytab src_keytab,
krb5_keytab dst_keytab,
krb5_keytab_entry entry)
{
krb5_error_code ret;
krb5_keytab_entry dummy;
char *name_str;
char *etype_str;
ret = krb5_unparse_name (context, entry.principal, &name_str);
if(ret) {
krb5_set_error_message(context, ret, "krb5_unparse_name");
name_str = NULL; /* XXX */
return ret;
}
ret = smb_krb5_enctype_to_string(context,
KRB5_KEY_TYPE(KRB5_KT_KEY(&entry)),
&etype_str);
if(ret) {
krb5_set_error_message(context, ret, "krb5_enctype_to_string");
etype_str = NULL; /* XXX */
return ret;
}
ret = krb5_kt_get_entry(context, dst_keytab,
entry.principal,
entry.vno,
KRB5_KEY_TYPE(KRB5_KT_KEY(&entry)),
&dummy);
if(ret == 0) {
/* this entry is already in the new keytab, so no need to
copy it; if the keyblocks are not the same, something
is weird, so complain about that */
if (!compare_keyblock(KRB5_KT_KEY(&entry), KRB5_KT_KEY(&dummy))) {
DEBUG(2, ("copy_one_entry: entry with different keyvalue "
"already exists for %s, keytype %s, kvno %d",
name_str, etype_str, entry.vno));
}
krb5_kt_free_entry(context, &dummy);
krb5_kt_free_entry (context, &entry);
free(name_str);
free(etype_str);
return ret;
} else if(ret != KRB5_KT_NOTFOUND) {
krb5_set_error_message (context, ret, "fetching %s/%s/%u",
name_str, etype_str, entry.vno);
krb5_kt_free_entry (context, &entry);
free(name_str);
free(etype_str);
return ret;
}
ret = krb5_kt_add_entry (context, dst_keytab, &entry);
krb5_kt_free_entry (context, &entry);
if (ret) {
krb5_set_error_message (context, ret, "adding %s/%s/%u",
name_str, etype_str, entry.vno);
free(name_str);
free(etype_str);
return ret;
}
free(name_str);
free(etype_str);
return ret;
}
krb5_error_code kt_copy(krb5_context context, const char *from, const char *to)
{
krb5_error_code ret;
krb5_keytab src_keytab, dst_keytab;
krb5_kt_cursor cursor;
krb5_keytab_entry entry;
ret = krb5_kt_resolve (context, from, &src_keytab);
if (ret) {
krb5_set_error_message (context, ret, "resolving src keytab `%s'", from);
return ret;
}
ret = krb5_kt_resolve (context, to, &dst_keytab);
if (ret) {
krb5_kt_close (context, src_keytab);
krb5_set_error_message (context, ret, "resolving dst keytab `%s'", to);
return ret;
}
ret = krb5_kt_start_seq_get (context, src_keytab, &cursor);
if (ret) {
krb5_set_error_message (context, ret, "krb5_kt_start_seq_get %s", from);
goto out;
}
while((ret = krb5_kt_next_entry(context, src_keytab,
&entry, &cursor)) == 0) {
ret = copy_one_entry(context, src_keytab, dst_keytab, entry);
if (ret) {
break;
}
}
krb5_kt_end_seq_get (context, src_keytab, &cursor);
out:
krb5_kt_close (context, src_keytab);
krb5_kt_close (context, dst_keytab);
if (ret == KRB5_KT_END) {
return 0;
} else if (ret == 0) {
return EINVAL;
}
return ret;
}
krb5_error_code kt_copy_one_principal(krb5_context context,
const char *from,
const char *to,
const char *principal,
krb5_kvno kvno,
const krb5_enctype *enctypes)
{
krb5_error_code ret;
krb5_keytab src_keytab, dst_keytab;
krb5_keytab_entry entry;
krb5_principal princ;
int i;
bool found_one = false;
ret = krb5_parse_name (context, principal, &princ);
if(ret) {
krb5_set_error_message(context, ret, "krb5_unparse_name");
return ret;
}
ret = krb5_kt_resolve (context, from, &src_keytab);
if (ret) {
krb5_set_error_message(context, ret, "resolving src keytab `%s'", from);
return ret;
}
ret = krb5_kt_resolve (context, to, &dst_keytab);
if (ret) {
krb5_kt_close (context, src_keytab);
krb5_set_error_message(context, ret, "resolving dst keytab `%s'", to);
return ret;
}
for (i=0; enctypes[i]; i++) {
ret = krb5_kt_get_entry(context, src_keytab,
princ,
kvno,
enctypes[i],
&entry);
if (ret == KRB5_KT_NOTFOUND) {
continue;
} else if (ret) {
break;
}
found_one = true;
ret = copy_one_entry(context, src_keytab, dst_keytab, entry);
if (ret) {
break;
}
}
if (ret == KRB5_KT_NOTFOUND) {
if (!found_one) {
char *princ_string;
int ret2 = krb5_unparse_name (context, princ, &princ_string);
if (ret2) {
krb5_set_error_message(context, ret,
"failed to fetch principal %s",
princ_string);
}
} else {
/* Not finding an enc type is not an error,
* as long as we copied one for the principal */
ret = 0;
}
}
krb5_kt_close (context, src_keytab);
krb5_kt_close (context, dst_keytab);
return ret;
}
#if !defined(HAVE_KRB5_KT_COMPARE)
krb5_boolean smb_krb5_kt_compare(krb5_context context,
krb5_keytab_entry *entry,
krb5_const_principal principal,
krb5_kvno kvno,
krb5_enctype enctype)
{
if (principal) {
if (!krb5_principal_compare(context,
entry->principal, principal)) {
return false;
}
}
if (kvno) {
if (entry->vno != kvno) {
return false;
}
}
if (enctype) {
if (KRB5_KEY_TYPE(KRB5_KT_KEY(entry)) != enctype) {
return false;
}
}
return true;
}
#endif