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/*
SSSD
NSS Responder
Copyright (C) Simo Sorce <ssorce@redhat.com> 2008
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "util/util.h"
#include <fcntl.h>
#include <time.h>
#include "tdb.h"
#define NC_USER_PREFIX "NCUSER"
#define NC_GROUP_PREFIX "NCGROUP"
#define NC_UID_PREFIX "NCUID"
#define NC_GID_PREFIX "NCGID"
struct nss_nc_ctx {
struct tdb_context *tdb;
};
static int string_to_tdb_data(char *str, TDB_DATA *ret)
{
if (!str || !ret) return EINVAL;
ret->dptr = (uint8_t *)str;
ret->dsize = strlen(str)+1;
return EOK;
}
int nss_ncache_init(TALLOC_CTX *memctx, struct nss_nc_ctx **_ctx)
{
struct nss_nc_ctx *ctx;
ctx = talloc_zero(memctx, struct nss_nc_ctx);
if (!ctx) return ENOMEM;
errno = 0;
/* open a memory only tdb with default hash size */
ctx->tdb = tdb_open("memcache", 0, TDB_INTERNAL, O_RDWR|O_CREAT, 0);
if (!ctx->tdb) return errno;
*_ctx = ctx;
return EOK;
};
static int nss_ncache_check_str(struct nss_nc_ctx *ctx, char *str, int ttl)
{
TDB_DATA key;
TDB_DATA data;
unsigned long long int timestamp;
bool expired = false;
char *ep;
int ret;
ret = string_to_tdb_data(str, &key);
if (ret != EOK) goto done;
data = tdb_fetch(ctx->tdb, key);
if (!data.dptr) {
ret = ENOENT;
goto done;
}
errno = 0;
timestamp = strtoull((const char *)data.dptr, &ep, 0);
if (errno != 0 || *ep != '\0') {
/* Malformed entry, remove it and return no entry */
expired = true;
goto done;
}
if (timestamp + ttl > time(NULL)) {
/* still valid */
ret = EEXIST;
goto done;
}
expired = true;
done:
if (expired) {
/* expired, remove and return no entry */
tdb_delete(ctx->tdb, key);
ret = ENOENT;
}
return ret;
}
static int nss_ncache_set_str(struct nss_nc_ctx *ctx, char *str)
{
TDB_DATA key;
TDB_DATA data;
char *timest;
int ret;
ret = string_to_tdb_data(str, &key);
if (ret != EOK) return ret;
timest = talloc_asprintf(ctx, "%llu", (unsigned long long int)time(NULL));
if (!timest) return ENOMEM;
ret = string_to_tdb_data(timest, &data);
if (ret != EOK) goto done;
ret = tdb_store(ctx->tdb, key, data, TDB_REPLACE);
if (ret != 0) {
DEBUG(1, ("Negative cache failed to set entry: [%s]",
tdb_errorstr(ctx->tdb)));
ret = EFAULT;
}
done:
talloc_free(timest);
return ret;
}
int nss_ncache_check_user(struct nss_nc_ctx *ctx, int ttl,
const char *domain, const char *name)
{
char *str;
int ret;
if (!name || !*name) return EINVAL;
str = talloc_asprintf(ctx, "%s/%s/%s", NC_USER_PREFIX, domain, name);
if (!str) return ENOMEM;
ret = nss_ncache_check_str(ctx, str, ttl);
talloc_free(str);
return ret;
}
int nss_ncache_check_group(struct nss_nc_ctx *ctx, int ttl,
const char *domain, const char *name)
{
char *str;
int ret;
if (!name || !*name) return EINVAL;
str = talloc_asprintf(ctx, "%s/%s/%s", NC_GROUP_PREFIX, domain, name);
if (!str) return ENOMEM;
ret = nss_ncache_check_str(ctx, str, ttl);
talloc_free(str);
return ret;
}
int nss_ncache_check_uid(struct nss_nc_ctx *ctx, int ttl, uid_t uid)
{
char *str;
int ret;
str = talloc_asprintf(ctx, "%s/%u", NC_UID_PREFIX, uid);
if (!str) return ENOMEM;
ret = nss_ncache_check_str(ctx, str, ttl);
talloc_free(str);
return ret;
}
int nss_ncache_check_gid(struct nss_nc_ctx *ctx, int ttl, gid_t gid)
{
char *str;
int ret;
str = talloc_asprintf(ctx, "%s/%u", NC_GID_PREFIX, gid);
if (!str) return ENOMEM;
ret = nss_ncache_check_str(ctx, str, ttl);
talloc_free(str);
return ret;
}
int nss_ncache_set_user(struct nss_nc_ctx *ctx,
const char *domain, const char *name)
{
char *str;
int ret;
if (!name || !*name) return EINVAL;
str = talloc_asprintf(ctx, "%s/%s/%s", NC_USER_PREFIX, domain, name);
if (!str) return ENOMEM;
ret = nss_ncache_set_str(ctx, str);
talloc_free(str);
return ret;
}
int nss_ncache_set_group(struct nss_nc_ctx *ctx,
const char *domain, const char *name)
{
char *str;
int ret;
if (!name || !*name) return EINVAL;
str = talloc_asprintf(ctx, "%s/%s/%s", NC_GROUP_PREFIX, domain, name);
if (!str) return ENOMEM;
ret = nss_ncache_set_str(ctx, str);
talloc_free(str);
return ret;
}
int nss_ncache_set_uid(struct nss_nc_ctx *ctx, uid_t uid)
{
char *str;
int ret;
str = talloc_asprintf(ctx, "%s/%u", NC_UID_PREFIX, uid);
if (!str) return ENOMEM;
ret = nss_ncache_set_str(ctx, str);
talloc_free(str);
return ret;
}
int nss_ncache_set_gid(struct nss_nc_ctx *ctx, gid_t gid)
{
char *str;
int ret;
str = talloc_asprintf(ctx, "%s/%u", NC_GID_PREFIX, gid);
if (!str) return ENOMEM;
ret = nss_ncache_set_str(ctx, str);
talloc_free(str);
return ret;
}
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