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|
/*
Unix SMB/CIFS implementation.
Winbind cache backend functions
Copyright (C) Andrew Tridgell 2001
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "winbindd.h"
struct winbind_cache {
struct winbindd_methods *backend;
TDB_CONTEXT *tdb;
};
struct cache_entry {
NTSTATUS status;
uint32 sequence_number;
uint8 *data;
uint32 len, ofs;
};
#define WINBINDD_MAX_CACHE_SIZE (50*1024*1024)
static struct winbind_cache *wcache;
/* flush the cache */
void wcache_flush_cache(void)
{
extern BOOL opt_nocache;
if (!wcache) return;
if (wcache->tdb) {
tdb_close(wcache->tdb);
wcache->tdb = NULL;
}
if (opt_nocache) return;
wcache->tdb = tdb_open_log(lock_path("winbindd_cache.tdb"), 5000,
TDB_CLEAR_IF_FIRST, O_RDWR|O_CREAT, 0600);
if (!wcache->tdb) {
DEBUG(0,("Failed to open winbindd_cache.tdb!\n"));
}
}
void winbindd_check_cache_size(time_t t)
{
static time_t last_check_time;
struct stat st;
if (last_check_time == (time_t)0)
last_check_time = t;
if (t - last_check_time < 60 && t - last_check_time > 0)
return;
if (wcache == NULL || wcache->tdb == NULL) {
DEBUG(0, ("Unable to check size of tdb cache - cache not open !\n"));
return;
}
if (fstat(wcache->tdb->fd, &st) == -1) {
DEBUG(0, ("Unable to check size of tdb cache %s!\n", strerror(errno) ));
return;
}
if (st.st_size > WINBINDD_MAX_CACHE_SIZE) {
DEBUG(10,("flushing cache due to size (%lu) > (%lu)\n",
(unsigned long)st.st_size,
(unsigned long)WINBINDD_MAX_CACHE_SIZE));
wcache_flush_cache();
}
}
/* get the winbind_cache structure */
static struct winbind_cache *get_cache(struct winbindd_domain *domain)
{
extern struct winbindd_methods msrpc_methods;
struct winbind_cache *ret = wcache;
if (ret) return ret;
ret = smb_xmalloc(sizeof(*ret));
ZERO_STRUCTP(ret);
switch (lp_security()) {
#ifdef HAVE_ADS
case SEC_ADS: {
extern struct winbindd_methods ads_methods;
ret->backend = &ads_methods;
break;
}
#endif
default:
ret->backend = &msrpc_methods;
}
wcache = ret;
wcache_flush_cache();
return ret;
}
/*
free a centry structure
*/
static void centry_free(struct cache_entry *centry)
{
if (!centry) return;
SAFE_FREE(centry->data);
free(centry);
}
/*
pull a uint32 from a cache entry
*/
static uint32 centry_uint32(struct cache_entry *centry)
{
uint32 ret;
if (centry->len - centry->ofs < 4) {
DEBUG(0,("centry corruption? needed 4 bytes, have %d\n",
centry->len - centry->ofs));
smb_panic("centry_uint32");
}
ret = IVAL(centry->data, centry->ofs);
centry->ofs += 4;
return ret;
}
/*
pull a uint8 from a cache entry
*/
static uint8 centry_uint8(struct cache_entry *centry)
{
uint8 ret;
if (centry->len - centry->ofs < 1) {
DEBUG(0,("centry corruption? needed 1 bytes, have %d\n",
centry->len - centry->ofs));
smb_panic("centry_uint32");
}
ret = CVAL(centry->data, centry->ofs);
centry->ofs += 1;
return ret;
}
/* pull a string from a cache entry, using the supplied
talloc context
*/
static char *centry_string(struct cache_entry *centry, TALLOC_CTX *mem_ctx)
{
uint32 len;
char *ret;
len = centry_uint8(centry);
if (len == 0xFF) {
/* a deliberate NULL string */
return NULL;
}
if (centry->len - centry->ofs < len) {
DEBUG(0,("centry corruption? needed %d bytes, have %d\n",
len, centry->len - centry->ofs));
smb_panic("centry_string");
}
ret = talloc(mem_ctx, len+1);
if (!ret) {
smb_panic("centry_string out of memory\n");
}
memcpy(ret,centry->data + centry->ofs, len);
ret[len] = 0;
centry->ofs += len;
return ret;
}
/* the server is considered down if it can't give us a sequence number */
static BOOL wcache_server_down(struct winbindd_domain *domain)
{
if (!wcache->tdb) return False;
return (domain->sequence_number == DOM_SEQUENCE_NONE);
}
/*
refresh the domain sequence number. If force is True
then always refresh it, no matter how recently we fetched it
*/
static void refresh_sequence_number(struct winbindd_domain *domain, BOOL force)
{
NTSTATUS status;
unsigned time_diff;
unsigned cache_time = lp_winbind_cache_time();
/* trying to reconnect is expensive, don't do it too often */
if (domain->sequence_number == DOM_SEQUENCE_NONE) {
cache_time *= 8;
}
time_diff = time(NULL) - domain->last_seq_check;
/* see if we have to refetch the domain sequence number */
if (!force && (time_diff < cache_time)) {
return;
}
status = wcache->backend->sequence_number(domain, &domain->sequence_number);
if (!NT_STATUS_IS_OK(status)) {
domain->sequence_number = DOM_SEQUENCE_NONE;
}
domain->last_seq_check = time(NULL);
}
/*
decide if a cache entry has expired
*/
static BOOL centry_expired(struct winbindd_domain *domain, struct cache_entry *centry)
{
/* if the server is OK and our cache entry came from when it was down then
the entry is invalid */
if (domain->sequence_number != DOM_SEQUENCE_NONE &&
centry->sequence_number == DOM_SEQUENCE_NONE) {
return True;
}
/* if the server is down or the cache entry is not older than the
current sequence number then it is OK */
if (wcache_server_down(domain) ||
centry->sequence_number == domain->sequence_number) {
return False;
}
/* it's expired */
return True;
}
/*
fetch an entry from the cache, with a varargs key. auto-fetch the sequence
number and return status
*/
static struct cache_entry *wcache_fetch(struct winbind_cache *cache,
struct winbindd_domain *domain,
const char *format, ...)
{
va_list ap;
char *kstr;
TDB_DATA data;
struct cache_entry *centry;
TDB_DATA key;
refresh_sequence_number(domain, False);
va_start(ap, format);
smb_xvasprintf(&kstr, format, ap);
va_end(ap);
key.dptr = kstr;
key.dsize = strlen(kstr);
data = tdb_fetch(wcache->tdb, key);
free(kstr);
if (!data.dptr) {
/* a cache miss */
return NULL;
}
centry = smb_xmalloc(sizeof(*centry));
centry->data = data.dptr;
centry->len = data.dsize;
centry->ofs = 0;
if (centry->len < 8) {
/* huh? corrupt cache? */
centry_free(centry);
return NULL;
}
centry->status = NT_STATUS(centry_uint32(centry));
centry->sequence_number = centry_uint32(centry);
if (centry_expired(domain, centry)) {
extern BOOL opt_dual_daemon;
if (opt_dual_daemon) {
extern BOOL backgroud_process;
backgroud_process = True;
} else {
centry_free(centry);
return NULL;
}
}
return centry;
}
/*
make sure we have at least len bytes available in a centry
*/
static void centry_expand(struct cache_entry *centry, uint32 len)
{
uint8 *p;
if (centry->len - centry->ofs >= len) return;
centry->len *= 2;
p = realloc(centry->data, centry->len);
if (!p) {
DEBUG(0,("out of memory: needed %d bytes in centry_expand\n", centry->len));
smb_panic("out of memory in centry_expand");
}
centry->data = p;
}
/*
push a uint32 into a centry
*/
static void centry_put_uint32(struct cache_entry *centry, uint32 v)
{
centry_expand(centry, 4);
SIVAL(centry->data, centry->ofs, v);
centry->ofs += 4;
}
/*
push a uint8 into a centry
*/
static void centry_put_uint8(struct cache_entry *centry, uint8 v)
{
centry_expand(centry, 1);
SCVAL(centry->data, centry->ofs, v);
centry->ofs += 1;
}
/*
push a string into a centry
*/
static void centry_put_string(struct cache_entry *centry, const char *s)
{
int len;
if (!s) {
/* null strings are marked as len 0xFFFF */
centry_put_uint8(centry, 0xFF);
return;
}
len = strlen(s);
/* can't handle more than 254 char strings. Truncating is probably best */
if (len > 254) len = 254;
centry_put_uint8(centry, len);
centry_expand(centry, len);
memcpy(centry->data + centry->ofs, s, len);
centry->ofs += len;
}
/*
start a centry for output. When finished, call centry_end()
*/
struct cache_entry *centry_start(struct winbindd_domain *domain, NTSTATUS status)
{
struct cache_entry *centry;
if (!wcache->tdb) return NULL;
centry = smb_xmalloc(sizeof(*centry));
centry->len = 8192; /* reasonable default */
centry->data = smb_xmalloc(centry->len);
centry->ofs = 0;
centry->sequence_number = domain->sequence_number;
centry_put_uint32(centry, NT_STATUS_V(status));
centry_put_uint32(centry, centry->sequence_number);
return centry;
}
/*
finish a centry and write it to the tdb
*/
static void centry_end(struct cache_entry *centry, const char *format, ...)
{
va_list ap;
char *kstr;
TDB_DATA key, data;
va_start(ap, format);
smb_xvasprintf(&kstr, format, ap);
va_end(ap);
key.dptr = kstr;
key.dsize = strlen(kstr);
data.dptr = centry->data;
data.dsize = centry->ofs;
tdb_store(wcache->tdb, key, data, TDB_REPLACE);
free(kstr);
}
/* form a sid from the domain plus rid */
static DOM_SID *form_sid(struct winbindd_domain *domain, uint32 rid)
{
static DOM_SID sid;
sid_copy(&sid, &domain->sid);
sid_append_rid(&sid, rid);
return &sid;
}
static void wcache_save_name_to_sid(struct winbindd_domain *domain, NTSTATUS status,
const char *name, DOM_SID *sid, enum SID_NAME_USE type)
{
struct cache_entry *centry;
uint32 len;
fstring uname;
centry = centry_start(domain, status);
if (!centry) return;
len = sid_size(sid);
centry_expand(centry, len);
centry_put_uint32(centry, type);
sid_linearize(centry->data + centry->ofs, len, sid);
centry->ofs += len;
fstrcpy(uname, name);
strupper(uname);
centry_end(centry, "NS/%s/%s", domain->name, uname);
centry_free(centry);
}
static void wcache_save_sid_to_name(struct winbindd_domain *domain, NTSTATUS status,
DOM_SID *sid, const char *name, enum SID_NAME_USE type, uint32 rid)
{
struct cache_entry *centry;
centry = centry_start(domain, status);
if (!centry) return;
if (NT_STATUS_IS_OK(status)) {
centry_put_uint32(centry, type);
centry_put_string(centry, name);
}
centry_end(centry, "SN/%s/%d", domain->name, rid);
centry_free(centry);
}
static void wcache_save_user(struct winbindd_domain *domain, NTSTATUS status, WINBIND_USERINFO *info)
{
struct cache_entry *centry;
centry = centry_start(domain, status);
if (!centry) return;
centry_put_string(centry, info->acct_name);
centry_put_string(centry, info->full_name);
centry_put_uint32(centry, info->user_rid);
centry_put_uint32(centry, info->group_rid);
centry_end(centry, "U/%s/%x", domain->name, info->user_rid);
centry_free(centry);
}
/* Query display info. This is the basic user list fn */
static NTSTATUS query_user_list(struct winbindd_domain *domain,
TALLOC_CTX *mem_ctx,
uint32 *num_entries,
WINBIND_USERINFO **info)
{
struct winbind_cache *cache = get_cache(domain);
struct cache_entry *centry = NULL;
NTSTATUS status;
int i;
if (!cache->tdb) goto do_query;
centry = wcache_fetch(cache, domain, "UL/%s", domain->name);
if (!centry) goto do_query;
*num_entries = centry_uint32(centry);
if (*num_entries == 0) goto do_cached;
(*info) = talloc(mem_ctx, sizeof(**info) * (*num_entries));
if (! (*info)) smb_panic("query_user_list out of memory");
for (i=0; i<(*num_entries); i++) {
(*info)[i].acct_name = centry_string(centry, mem_ctx);
(*info)[i].full_name = centry_string(centry, mem_ctx);
(*info)[i].user_rid = centry_uint32(centry);
(*info)[i].group_rid = centry_uint32(centry);
}
do_cached:
status = centry->status;
centry_free(centry);
return status;
do_query:
*num_entries = 0;
*info = NULL;
if (wcache_server_down(domain)) {
return NT_STATUS_SERVER_DISABLED;
}
status = cache->backend->query_user_list(domain, mem_ctx, num_entries, info);
/* and save it */
refresh_sequence_number(domain, True);
centry = centry_start(domain, status);
if (!centry) goto skip_save;
centry_put_uint32(centry, *num_entries);
for (i=0; i<(*num_entries); i++) {
centry_put_string(centry, (*info)[i].acct_name);
centry_put_string(centry, (*info)[i].full_name);
centry_put_uint32(centry, (*info)[i].user_rid);
centry_put_uint32(centry, (*info)[i].group_rid);
if (cache->backend->consistent) {
/* when the backend is consistent we can pre-prime some mappings */
wcache_save_name_to_sid(domain, NT_STATUS_OK,
(*info)[i].acct_name,
form_sid(domain, (*info)[i].user_rid),
SID_NAME_USER);
wcache_save_sid_to_name(domain, NT_STATUS_OK,
form_sid(domain, (*info)[i].user_rid),
(*info)[i].acct_name,
SID_NAME_USER, (*info)[i].user_rid);
wcache_save_user(domain, NT_STATUS_OK, &(*info)[i]);
}
}
centry_end(centry, "UL/%s", domain->name);
centry_free(centry);
skip_save:
return status;
}
/* list all domain groups */
static NTSTATUS enum_dom_groups(struct winbindd_domain *domain,
TALLOC_CTX *mem_ctx,
uint32 *num_entries,
struct acct_info **info)
{
struct winbind_cache *cache = get_cache(domain);
struct cache_entry *centry = NULL;
NTSTATUS status;
int i;
if (!cache->tdb) goto do_query;
centry = wcache_fetch(cache, domain, "GL/%s", domain->name);
if (!centry) goto do_query;
*num_entries = centry_uint32(centry);
if (*num_entries == 0) goto do_cached;
(*info) = talloc(mem_ctx, sizeof(**info) * (*num_entries));
if (! (*info)) smb_panic("enum_dom_groups out of memory");
for (i=0; i<(*num_entries); i++) {
fstrcpy((*info)[i].acct_name, centry_string(centry, mem_ctx));
fstrcpy((*info)[i].acct_desc, centry_string(centry, mem_ctx));
(*info)[i].rid = centry_uint32(centry);
}
do_cached:
status = centry->status;
centry_free(centry);
return status;
do_query:
*num_entries = 0;
*info = NULL;
if (wcache_server_down(domain)) {
return NT_STATUS_SERVER_DISABLED;
}
status = cache->backend->enum_dom_groups(domain, mem_ctx, num_entries, info);
/* and save it */
refresh_sequence_number(domain, True);
centry = centry_start(domain, status);
if (!centry) goto skip_save;
centry_put_uint32(centry, *num_entries);
for (i=0; i<(*num_entries); i++) {
centry_put_string(centry, (*info)[i].acct_name);
centry_put_string(centry, (*info)[i].acct_desc);
centry_put_uint32(centry, (*info)[i].rid);
}
centry_end(centry, "GL/%s", domain->name);
centry_free(centry);
skip_save:
return status;
}
/* convert a single name to a sid in a domain */
static NTSTATUS name_to_sid(struct winbindd_domain *domain,
const char *name,
DOM_SID *sid,
enum SID_NAME_USE *type)
{
struct winbind_cache *cache = get_cache(domain);
struct cache_entry *centry = NULL;
NTSTATUS status;
fstring uname;
if (!cache->tdb) goto do_query;
fstrcpy(uname, name);
strupper(uname);
centry = wcache_fetch(cache, domain, "NS/%s/%s", domain->name, uname);
if (!centry) goto do_query;
*type = centry_uint32(centry);
sid_parse(centry->data + centry->ofs, centry->len - centry->ofs, sid);
status = centry->status;
centry_free(centry);
return status;
do_query:
ZERO_STRUCTP(sid);
if (wcache_server_down(domain)) {
return NT_STATUS_SERVER_DISABLED;
}
status = cache->backend->name_to_sid(domain, name, sid, type);
/* and save it */
wcache_save_name_to_sid(domain, status, name, sid, *type);
/* We can't save the sid to name mapping as we don't know the
correct case of the name without looking it up */
return status;
}
/* convert a sid to a user or group name. The sid is guaranteed to be in the domain
given */
static NTSTATUS sid_to_name(struct winbindd_domain *domain,
TALLOC_CTX *mem_ctx,
DOM_SID *sid,
char **name,
enum SID_NAME_USE *type)
{
struct winbind_cache *cache = get_cache(domain);
struct cache_entry *centry = NULL;
NTSTATUS status;
uint32 rid = 0;
sid_peek_rid(sid, &rid);
if (!cache->tdb) goto do_query;
centry = wcache_fetch(cache, domain, "SN/%s/%d", domain->name, rid);
if (!centry) goto do_query;
if (NT_STATUS_IS_OK(centry->status)) {
*type = centry_uint32(centry);
*name = centry_string(centry, mem_ctx);
}
status = centry->status;
centry_free(centry);
return status;
do_query:
*name = NULL;
if (wcache_server_down(domain)) {
return NT_STATUS_SERVER_DISABLED;
}
status = cache->backend->sid_to_name(domain, mem_ctx, sid, name, type);
/* and save it */
refresh_sequence_number(domain, True);
wcache_save_sid_to_name(domain, status, sid, *name, *type, rid);
wcache_save_name_to_sid(domain, status, *name, sid, *type);
return status;
}
/* Lookup user information from a rid */
static NTSTATUS query_user(struct winbindd_domain *domain,
TALLOC_CTX *mem_ctx,
uint32 user_rid,
WINBIND_USERINFO *info)
{
struct winbind_cache *cache = get_cache(domain);
struct cache_entry *centry = NULL;
NTSTATUS status;
if (!cache->tdb) goto do_query;
centry = wcache_fetch(cache, domain, "U/%s/%x", domain->name, user_rid);
if (!centry) goto do_query;
info->acct_name = centry_string(centry, mem_ctx);
info->full_name = centry_string(centry, mem_ctx);
info->user_rid = centry_uint32(centry);
info->group_rid = centry_uint32(centry);
status = centry->status;
centry_free(centry);
return status;
do_query:
ZERO_STRUCTP(info);
if (wcache_server_down(domain)) {
return NT_STATUS_SERVER_DISABLED;
}
status = cache->backend->query_user(domain, mem_ctx, user_rid, info);
/* and save it */
refresh_sequence_number(domain, True);
wcache_save_user(domain, status, info);
return status;
}
/* Lookup groups a user is a member of. */
static NTSTATUS lookup_usergroups(struct winbindd_domain *domain,
TALLOC_CTX *mem_ctx,
uint32 user_rid,
uint32 *num_groups, uint32 **user_gids)
{
struct winbind_cache *cache = get_cache(domain);
struct cache_entry *centry = NULL;
NTSTATUS status;
int i;
if (!cache->tdb) goto do_query;
centry = wcache_fetch(cache, domain, "UG/%s/%x", domain->name, user_rid);
if (!centry) goto do_query;
*num_groups = centry_uint32(centry);
if (*num_groups == 0) goto do_cached;
(*user_gids) = talloc(mem_ctx, sizeof(**user_gids) * (*num_groups));
if (! (*user_gids)) smb_panic("lookup_usergroups out of memory");
for (i=0; i<(*num_groups); i++) {
(*user_gids)[i] = centry_uint32(centry);
}
do_cached:
status = centry->status;
centry_free(centry);
return status;
do_query:
(*num_groups) = 0;
(*user_gids) = NULL;
if (wcache_server_down(domain)) {
return NT_STATUS_SERVER_DISABLED;
}
status = cache->backend->lookup_usergroups(domain, mem_ctx, user_rid, num_groups, user_gids);
/* and save it */
refresh_sequence_number(domain, True);
centry = centry_start(domain, status);
if (!centry) goto skip_save;
centry_put_uint32(centry, *num_groups);
for (i=0; i<(*num_groups); i++) {
centry_put_uint32(centry, (*user_gids)[i]);
}
centry_end(centry, "UG/%s/%x", domain->name, user_rid);
centry_free(centry);
skip_save:
return status;
}
static NTSTATUS lookup_groupmem(struct winbindd_domain *domain,
TALLOC_CTX *mem_ctx,
uint32 group_rid, uint32 *num_names,
uint32 **rid_mem, char ***names,
uint32 **name_types)
{
struct winbind_cache *cache = get_cache(domain);
struct cache_entry *centry = NULL;
NTSTATUS status;
int i;
if (!cache->tdb) goto do_query;
centry = wcache_fetch(cache, domain, "GM/%s/%x", domain->name, group_rid);
if (!centry) goto do_query;
*num_names = centry_uint32(centry);
if (*num_names == 0) goto do_cached;
(*rid_mem) = talloc(mem_ctx, sizeof(**rid_mem) * (*num_names));
(*names) = talloc(mem_ctx, sizeof(**names) * (*num_names));
(*name_types) = talloc(mem_ctx, sizeof(**name_types) * (*num_names));
if (! (*rid_mem) || ! (*names) || ! (*name_types)) {
smb_panic("lookup_groupmem out of memory");
}
for (i=0; i<(*num_names); i++) {
(*rid_mem)[i] = centry_uint32(centry);
(*names)[i] = centry_string(centry, mem_ctx);
(*name_types)[i] = centry_uint32(centry);
}
do_cached:
status = centry->status;
centry_free(centry);
return status;
do_query:
(*num_names) = 0;
(*rid_mem) = NULL;
(*names) = NULL;
(*name_types) = NULL;
if (wcache_server_down(domain)) {
return NT_STATUS_SERVER_DISABLED;
}
status = cache->backend->lookup_groupmem(domain, mem_ctx, group_rid, num_names,
rid_mem, names, name_types);
/* and save it */
refresh_sequence_number(domain, True);
centry = centry_start(domain, status);
if (!centry) goto skip_save;
centry_put_uint32(centry, *num_names);
for (i=0; i<(*num_names); i++) {
centry_put_uint32(centry, (*rid_mem)[i]);
centry_put_string(centry, (*names)[i]);
centry_put_uint32(centry, (*name_types)[i]);
}
centry_end(centry, "GM/%s/%x", domain->name, group_rid);
centry_free(centry);
skip_save:
return status;
}
/* find the sequence number for a domain */
static NTSTATUS sequence_number(struct winbindd_domain *domain, uint32 *seq)
{
refresh_sequence_number(domain, False);
*seq = domain->sequence_number;
return NT_STATUS_OK;
}
/* enumerate trusted domains */
static NTSTATUS trusted_domains(struct winbindd_domain *domain,
TALLOC_CTX *mem_ctx,
uint32 *num_domains,
char ***names,
DOM_SID **dom_sids)
{
struct winbind_cache *cache = get_cache(domain);
/* we don't cache this call */
return cache->backend->trusted_domains(domain, mem_ctx, num_domains,
names, dom_sids);
}
/* find the domain sid */
static NTSTATUS domain_sid(struct winbindd_domain *domain, DOM_SID *sid)
{
struct winbind_cache *cache = get_cache(domain);
/* we don't cache this call */
return cache->backend->domain_sid(domain, sid);
}
/* the ADS backend methods are exposed via this structure */
struct winbindd_methods cache_methods = {
True,
query_user_list,
enum_dom_groups,
name_to_sid,
sid_to_name,
query_user,
lookup_usergroups,
lookup_groupmem,
sequence_number,
trusted_domains,
domain_sid
};
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