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/*
* System Security Services Daemon. NSS client interface
*
* Copyright (C) Simo Sorce 2011
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* GROUP database NSS interface using mmap cache */
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <time.h>
#include "nss_mc.h"
struct sss_cli_mc_ctx gr_mc_ctx = { false, -1, 0, NULL, 0, NULL, 0, NULL, 0 };
static errno_t sss_nss_mc_parse_result(struct sss_mc_rec *rec,
struct group *result,
char *buffer, size_t buflen)
{
struct sss_mc_grp_data *data;
time_t expire;
void *cookie;
char *membuf;
size_t memsize;
int ret;
int i;
/* additional checks before filling result*/
expire = rec->expire;
if (expire < time(NULL)) {
/* entry is now invalid */
return EINVAL;
}
data = (struct sss_mc_grp_data *)rec->data;
memsize = (data->members + 1) * sizeof(char *);
if (data->strs_len + memsize > buflen) {
return ERANGE;
}
/* fill in glibc provided structs */
/* copy in buffer */
membuf = buffer + memsize;
memcpy(membuf, data->strs, data->strs_len);
/* fill in group */
result->gr_gid = data->gid;
result->gr_mem = (char **)buffer;
result->gr_mem[data->members] = NULL;
cookie = NULL;
ret = sss_nss_str_ptr_from_buffer(&result->gr_name, &cookie,
membuf, data->strs_len);
if (ret) {
return ret;
}
ret = sss_nss_str_ptr_from_buffer(&result->gr_passwd, &cookie,
membuf, data->strs_len);
if (ret) {
return ret;
}
for (i = 0; i < data->members; i++) {
ret = sss_nss_str_ptr_from_buffer(&result->gr_mem[i], &cookie,
membuf, data->strs_len);
if (ret) {
return ret;
}
}
if (cookie != NULL) {
return EINVAL;
}
return 0;
}
errno_t sss_nss_mc_getgrnam(const char *name, size_t name_len,
struct group *result,
char *buffer, size_t buflen)
{
struct sss_mc_rec *rec = NULL;
struct sss_mc_grp_data *data;
char *rec_name;
uint32_t hash;
uint32_t slot;
int ret;
ret = sss_nss_mc_get_ctx("group", &gr_mc_ctx);
if (ret) {
return ret;
}
/* hashes are calculated including the NULL terminator */
hash = sss_nss_mc_hash(&gr_mc_ctx, name, name_len + 1);
slot = gr_mc_ctx.hash_table[hash];
if (slot > MC_SIZE_TO_SLOTS(gr_mc_ctx.dt_size)) {
return ENOENT;
}
while (slot != MC_INVALID_VAL) {
ret = sss_nss_mc_get_record(&gr_mc_ctx, slot, &rec);
if (ret) {
goto done;
}
/* check record matches what we are searching for */
if (hash != rec->hash1) {
/* if name hash does not match we can skip this immediately */
slot = rec->next;
continue;
}
data = (struct sss_mc_grp_data *)rec->data;
rec_name = (char *)data + data->name;
if (strcmp(name, rec_name) == 0) {
break;
}
slot = rec->next;
}
if (slot == MC_INVALID_VAL) {
ret = ENOENT;
goto done;
}
ret = sss_nss_mc_parse_result(rec, result, buffer, buflen);
done:
free(rec);
return ret;
}
errno_t sss_nss_mc_getgrgid(gid_t gid,
struct group *result,
char *buffer, size_t buflen)
{
struct sss_mc_rec *rec = NULL;
struct sss_mc_grp_data *data;
char gidstr[11];
uint32_t hash;
uint32_t slot;
int len;
int ret;
ret = sss_nss_mc_get_ctx("group", &gr_mc_ctx);
if (ret) {
return ret;
}
len = snprintf(gidstr, 11, "%ld", (long)gid);
if (len > 10) {
return EINVAL;
}
/* hashes are calculated including the NULL terminator */
hash = sss_nss_mc_hash(&gr_mc_ctx, gidstr, len+1);
slot = gr_mc_ctx.hash_table[hash];
if (slot > MC_SIZE_TO_SLOTS(gr_mc_ctx.dt_size)) {
return ENOENT;
}
while (slot != MC_INVALID_VAL) {
ret = sss_nss_mc_get_record(&gr_mc_ctx, slot, &rec);
if (ret) {
goto done;
}
/* check record matches what we are searching for */
if (hash != rec->hash2) {
/* if uid hash does not match we can skip this immediately */
slot = rec->next;
continue;
}
data = (struct sss_mc_grp_data *)rec->data;
if (gid == data->gid) {
break;
}
slot = rec->next;
}
if (slot == MC_INVALID_VAL) {
ret = ENOENT;
goto done;
}
ret = sss_nss_mc_parse_result(rec, result, buffer, buflen);
done:
free(rec);
return ret;
}
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