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/*
* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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 "krb5_locl.h"
RCSID("$Id: keytab_memory.c 16352 2005-12-05 18:39:46Z lha $");
/* memory operations -------------------------------------------- */
struct mkt_data {
krb5_keytab_entry *entries;
int num_entries;
char *name;
int refcount;
struct mkt_data *next;
};
/* this mutex protects mkt_head, ->refcount, and ->next
* content is not protected (name is static and need no protection)
*/
static HEIMDAL_MUTEX mkt_mutex = HEIMDAL_MUTEX_INITIALIZER;
static struct mkt_data *mkt_head;
static krb5_error_code
mkt_resolve(krb5_context context, const char *name, krb5_keytab id)
{
struct mkt_data *d;
HEIMDAL_MUTEX_lock(&mkt_mutex);
for (d = mkt_head; d != NULL; d = d->next)
if (strcmp(d->name, name) == 0)
break;
if (d) {
if (d->refcount < 1)
krb5_abortx(context, "Double close on memory keytab, "
"refcount < 1 %d", d->refcount);
d->refcount++;
id->data = d;
HEIMDAL_MUTEX_unlock(&mkt_mutex);
return 0;
}
d = calloc(1, sizeof(*d));
if(d == NULL) {
HEIMDAL_MUTEX_unlock(&mkt_mutex);
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
d->name = strdup(name);
if (d->name == NULL) {
HEIMDAL_MUTEX_unlock(&mkt_mutex);
free(d);
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
d->entries = NULL;
d->num_entries = 0;
d->refcount = 1;
d->next = mkt_head;
mkt_head = d;
HEIMDAL_MUTEX_unlock(&mkt_mutex);
id->data = d;
return 0;
}
static krb5_error_code
mkt_close(krb5_context context, krb5_keytab id)
{
struct mkt_data *d = id->data, **dp;
int i;
HEIMDAL_MUTEX_lock(&mkt_mutex);
if (d->refcount < 1)
krb5_abortx(context,
"krb5 internal error, memory keytab refcount < 1 on close");
if (--d->refcount > 0) {
HEIMDAL_MUTEX_unlock(&mkt_mutex);
return 0;
}
for (dp = &mkt_head; *dp != NULL; dp = &(*dp)->next) {
if (*dp == d) {
*dp = d->next;
break;
}
}
HEIMDAL_MUTEX_unlock(&mkt_mutex);
free(d->name);
for(i = 0; i < d->num_entries; i++)
krb5_kt_free_entry(context, &d->entries[i]);
free(d->entries);
free(d);
return 0;
}
static krb5_error_code
mkt_get_name(krb5_context context,
krb5_keytab id,
char *name,
size_t namesize)
{
struct mkt_data *d = id->data;
strlcpy(name, d->name, namesize);
return 0;
}
static krb5_error_code
mkt_start_seq_get(krb5_context context,
krb5_keytab id,
krb5_kt_cursor *c)
{
/* XXX */
c->fd = 0;
return 0;
}
static krb5_error_code
mkt_next_entry(krb5_context context,
krb5_keytab id,
krb5_keytab_entry *entry,
krb5_kt_cursor *c)
{
struct mkt_data *d = id->data;
if(c->fd >= d->num_entries)
return KRB5_KT_END;
return krb5_kt_copy_entry_contents(context, &d->entries[c->fd++], entry);
}
static krb5_error_code
mkt_end_seq_get(krb5_context context,
krb5_keytab id,
krb5_kt_cursor *cursor)
{
return 0;
}
static krb5_error_code
mkt_add_entry(krb5_context context,
krb5_keytab id,
krb5_keytab_entry *entry)
{
struct mkt_data *d = id->data;
krb5_keytab_entry *tmp;
tmp = realloc(d->entries, (d->num_entries + 1) * sizeof(*d->entries));
if(tmp == NULL) {
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
d->entries = tmp;
return krb5_kt_copy_entry_contents(context, entry,
&d->entries[d->num_entries++]);
}
static krb5_error_code
mkt_remove_entry(krb5_context context,
krb5_keytab id,
krb5_keytab_entry *entry)
{
struct mkt_data *d = id->data;
krb5_keytab_entry *e, *end;
int found = 0;
if (d->num_entries == 0) {
krb5_clear_error_string(context);
return KRB5_KT_NOTFOUND;
}
/* do this backwards to minimize copying */
for(end = d->entries + d->num_entries, e = end - 1; e >= d->entries; e--) {
if(krb5_kt_compare(context, e, entry->principal,
entry->vno, entry->keyblock.keytype)) {
krb5_kt_free_entry(context, e);
memmove(e, e + 1, (end - e - 1) * sizeof(*e));
memset(end - 1, 0, sizeof(*end));
d->num_entries--;
end--;
found = 1;
}
}
if (!found) {
krb5_clear_error_string (context);
return KRB5_KT_NOTFOUND;
}
e = realloc(d->entries, d->num_entries * sizeof(*d->entries));
if(e != NULL || d->num_entries == 0)
d->entries = e;
return 0;
}
const krb5_kt_ops krb5_mkt_ops = {
"MEMORY",
mkt_resolve,
mkt_get_name,
mkt_close,
NULL, /* get */
mkt_start_seq_get,
mkt_next_entry,
mkt_end_seq_get,
mkt_add_entry,
mkt_remove_entry
};
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