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samba-mirror/source3/winbindd/idmap_tdb_common.c
Volker Lendecke fa9e6a50da idmap: Make pointer initialization explicit
Took me a few seconds to find this NULL initializer

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2018-07-26 22:44:24 +02:00

655 lines
16 KiB
C

/*
Unix SMB/CIFS implementation.
common functions for TDB based idmapping backends
Copyright (C) Christian Ambach 2012
These functions were initially copied over from idmap_tdb.c and idmap_tdb2.c
which are:
Copyright (C) Tim Potter 2000
Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
Copyright (C) Jeremy Allison 2006
Copyright (C) Simo Sorce 2003-2006
Copyright (C) Michael Adam 2009-2010
Copyright (C) Andrew Tridgell 2007
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 "includes.h"
#include "idmap_tdb_common.h"
#include "dbwrap/dbwrap.h"
#include "util_tdb.h"
#include "idmap_rw.h"
#include "../libcli/security/dom_sid.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP
struct idmap_tdb_common_allocate_id_context {
const char *hwmkey;
const char *hwmtype;
uint32_t high_hwm;
uint32_t hwm;
};
static NTSTATUS idmap_tdb_common_allocate_id_action(struct db_context *db,
void *private_data)
{
NTSTATUS ret;
struct idmap_tdb_common_allocate_id_context *state = private_data;
uint32_t hwm;
ret = dbwrap_fetch_uint32_bystring(db, state->hwmkey, &hwm);
if (!NT_STATUS_IS_OK(ret)) {
ret = NT_STATUS_INTERNAL_DB_ERROR;
goto done;
}
/* check it is in the range */
if (hwm > state->high_hwm) {
DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
state->hwmtype, (unsigned long)state->high_hwm));
ret = NT_STATUS_UNSUCCESSFUL;
goto done;
}
/* fetch a new id and increment it */
ret = dbwrap_change_uint32_atomic_bystring(db, state->hwmkey, &hwm, 1);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(1, ("Fatal error while fetching a new %s value\n!",
state->hwmtype));
goto done;
}
/* recheck it is in the range */
if (hwm > state->high_hwm) {
DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
state->hwmtype, (unsigned long)state->high_hwm));
ret = NT_STATUS_UNSUCCESSFUL;
goto done;
}
ret = NT_STATUS_OK;
state->hwm = hwm;
done:
return ret;
}
static NTSTATUS idmap_tdb_common_allocate_id(struct idmap_domain *dom,
struct unixid *xid)
{
const char *hwmkey;
const char *hwmtype;
uint32_t hwm = 0;
NTSTATUS status;
struct idmap_tdb_common_allocate_id_context state;
struct idmap_tdb_common_context *ctx;
ctx =
talloc_get_type_abort(dom->private_data,
struct idmap_tdb_common_context);
/* Get current high water mark */
switch (xid->type) {
case ID_TYPE_UID:
hwmkey = ctx->hwmkey_uid;
hwmtype = "UID";
break;
case ID_TYPE_GID:
hwmkey = ctx->hwmkey_gid;
hwmtype = "GID";
break;
default:
DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
return NT_STATUS_INVALID_PARAMETER;
}
state.hwm = hwm;
state.high_hwm = ctx->max_id;
state.hwmtype = hwmtype;
state.hwmkey = hwmkey;
status = dbwrap_trans_do(ctx->db, idmap_tdb_common_allocate_id_action,
&state);
if (NT_STATUS_IS_OK(status)) {
xid->id = state.hwm;
DEBUG(10, ("New %s = %d\n", hwmtype, state.hwm));
} else {
DEBUG(1, ("Error allocating a new %s\n", hwmtype));
}
return status;
}
/**
* Allocate a new unix-ID.
* For now this is for the default idmap domain only.
* Should be extended later on.
*/
NTSTATUS idmap_tdb_common_get_new_id(struct idmap_domain * dom,
struct unixid * id)
{
NTSTATUS ret;
if (!strequal(dom->name, "*")) {
DEBUG(3, ("idmap_tdb_common_get_new_id: "
"Refusing allocation of a new unixid for domain'%s'. "
"Currently only supported for the default "
"domain \"*\".\n", dom->name));
return NT_STATUS_NOT_IMPLEMENTED;
}
ret = idmap_tdb_common_allocate_id(dom, id);
return ret;
}
/**
* store a mapping in the database.
*/
struct idmap_tdb_common_set_mapping_context {
const char *ksidstr;
const char *kidstr;
};
static NTSTATUS idmap_tdb_common_set_mapping_action(struct db_context *db,
void *private_data)
{
TDB_DATA data;
NTSTATUS ret;
struct idmap_tdb_common_set_mapping_context *state = private_data;
TALLOC_CTX *tmp_ctx = talloc_stackframe();
DEBUG(10, ("Storing %s <-> %s map\n", state->ksidstr, state->kidstr));
/* check whether sid mapping is already present in db */
ret = dbwrap_fetch_bystring(db, tmp_ctx, state->ksidstr, &data);
if (NT_STATUS_IS_OK(ret)) {
ret = NT_STATUS_OBJECT_NAME_COLLISION;
goto done;
}
ret = dbwrap_store_bystring(db, state->ksidstr,
string_term_tdb_data(state->kidstr),
TDB_INSERT);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0, ("Error storing SID -> ID: %s\n", nt_errstr(ret)));
goto done;
}
ret = dbwrap_store_bystring(db, state->kidstr,
string_term_tdb_data(state->ksidstr),
TDB_INSERT);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0, ("Error storing ID -> SID: %s\n", nt_errstr(ret)));
/* try to remove the previous stored SID -> ID map */
dbwrap_delete_bystring(db, state->ksidstr);
goto done;
}
DEBUG(10, ("Stored %s <-> %s\n", state->ksidstr, state->kidstr));
done:
talloc_free(tmp_ctx);
return ret;
}
NTSTATUS idmap_tdb_common_set_mapping(struct idmap_domain * dom,
const struct id_map * map)
{
struct idmap_tdb_common_context *ctx;
struct idmap_tdb_common_set_mapping_context state;
NTSTATUS ret;
char *ksidstr = NULL;
char *kidstr = NULL;
if (!map || !map->sid) {
return NT_STATUS_INVALID_PARAMETER;
}
/* TODO: should we filter a set_mapping using low/high filters ? */
ctx =
talloc_get_type_abort(dom->private_data,
struct idmap_tdb_common_context);
switch (map->xid.type) {
case ID_TYPE_UID:
kidstr =
talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
break;
case ID_TYPE_GID:
kidstr =
talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
break;
default:
DEBUG(2, ("INVALID unix ID type: 0x%02x\n", map->xid.type));
return NT_STATUS_INVALID_PARAMETER;
}
if (kidstr == NULL) {
DEBUG(0, ("ERROR: Out of memory!\n"));
ret = NT_STATUS_NO_MEMORY;
goto done;
}
ksidstr = sid_string_talloc(ctx, map->sid);
if (ksidstr == NULL) {
DEBUG(0, ("Out of memory!\n"));
ret = NT_STATUS_NO_MEMORY;
goto done;
}
state.ksidstr = ksidstr;
state.kidstr = kidstr;
ret = dbwrap_trans_do(ctx->db, idmap_tdb_common_set_mapping_action,
&state);
done:
talloc_free(ksidstr);
talloc_free(kidstr);
return ret;
}
/*
* Create a new mapping for an unmapped SID, also allocating a new ID.
* This should be run inside a transaction.
*
* TODO:
* Properly integrate this with multi domain idmap config:
* Currently, the allocator is default-config only.
*/
NTSTATUS idmap_tdb_common_new_mapping(struct idmap_domain * dom,
struct id_map * map)
{
NTSTATUS ret;
struct idmap_tdb_common_context *ctx;
ctx =
talloc_get_type_abort(dom->private_data,
struct idmap_tdb_common_context);
ret = idmap_rw_new_mapping(dom, ctx->rw_ops, map);
return ret;
}
/*
lookup a set of unix ids
*/
NTSTATUS idmap_tdb_common_unixids_to_sids(struct idmap_domain * dom,
struct id_map ** ids)
{
NTSTATUS ret;
size_t i, num_mapped = 0;
struct idmap_tdb_common_context *ctx;
NTSTATUS(*unixid_to_sid_fn) (struct idmap_domain * dom,
struct id_map * map);
ctx =
talloc_get_type_abort(dom->private_data,
struct idmap_tdb_common_context);
if (ctx->unixid_to_sid_fn == NULL) {
unixid_to_sid_fn = idmap_tdb_common_unixid_to_sid;
} else {
unixid_to_sid_fn = ctx->unixid_to_sid_fn;
}
/* initialize the status to avoid surprise */
for (i = 0; ids[i]; i++) {
ids[i]->status = ID_UNKNOWN;
}
for (i = 0; ids[i]; i++) {
ret = unixid_to_sid_fn(dom, ids[i]);
if (!NT_STATUS_IS_OK(ret)) {
/* if it is just a failed mapping continue */
if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
/* make sure it is marked as unmapped */
ids[i]->status = ID_UNMAPPED;
continue;
}
/* some fatal error occurred, return immediately */
goto done;
}
/* all ok, id is mapped */
ids[i]->status = ID_MAPPED;
num_mapped += 1;
}
ret = NT_STATUS_OK;
done:
if (NT_STATUS_IS_OK(ret)) {
if (i == 0 || num_mapped == 0) {
ret = NT_STATUS_NONE_MAPPED;
} else if (num_mapped < i) {
ret = STATUS_SOME_UNMAPPED;
} else {
ret = NT_STATUS_OK;
}
}
return ret;
}
/*
default single id to sid lookup function
*/
NTSTATUS idmap_tdb_common_unixid_to_sid(struct idmap_domain * dom,
struct id_map * map)
{
NTSTATUS ret;
TDB_DATA data;
char *keystr;
struct idmap_tdb_common_context *ctx;
if (!dom || !map) {
return NT_STATUS_INVALID_PARAMETER;
}
ctx =
talloc_get_type_abort(dom->private_data,
struct idmap_tdb_common_context);
/* apply filters before checking */
if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
DEBUG(5,
("Requested id (%u) out of range (%u - %u). Filtered!\n",
map->xid.id, dom->low_id, dom->high_id));
return NT_STATUS_NONE_MAPPED;
}
switch (map->xid.type) {
case ID_TYPE_UID:
keystr =
talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
break;
case ID_TYPE_GID:
keystr =
talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
break;
default:
DEBUG(2, ("INVALID unix ID type: 0x%02x\n", map->xid.type));
return NT_STATUS_INVALID_PARAMETER;
}
if (keystr == NULL) {
DEBUG(0, ("Out of memory!\n"));
ret = NT_STATUS_NO_MEMORY;
goto done;
}
DEBUG(10, ("Fetching record %s\n", keystr));
/* Check if the mapping exists */
ret = dbwrap_fetch_bystring(ctx->db, keystr, keystr, &data);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(10, ("Record %s not found\n", keystr));
ret = NT_STATUS_NONE_MAPPED;
goto done;
}
if ((data.dsize == 0) || (data.dptr[data.dsize-1] != '\0')) {
DBG_DEBUG("Invalid record length %zu\n", data.dsize);
ret = NT_STATUS_INTERNAL_DB_ERROR;
goto done;
}
if (!string_to_sid(map->sid, (const char *)data.dptr)) {
DEBUG(10, ("INVALID SID (%s) in record %s\n",
(const char *)data.dptr, keystr));
ret = NT_STATUS_INTERNAL_DB_ERROR;
goto done;
}
DEBUG(10, ("Found record %s -> %s\n", keystr, (const char *)data.dptr));
ret = NT_STATUS_OK;
done:
talloc_free(keystr);
return ret;
}
/**********************************
Single sid to id lookup function.
**********************************/
NTSTATUS idmap_tdb_common_sid_to_unixid(struct idmap_domain * dom,
struct id_map * map)
{
NTSTATUS ret;
TDB_DATA data;
char *keystr;
unsigned long rec_id = 0;
struct idmap_tdb_common_context *ctx;
TALLOC_CTX *tmp_ctx = talloc_stackframe();
if (!dom || !map) {
talloc_free(tmp_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
ctx =
talloc_get_type_abort(dom->private_data,
struct idmap_tdb_common_context);
keystr = sid_string_talloc(tmp_ctx, map->sid);
if (keystr == NULL) {
DEBUG(0, ("Out of memory!\n"));
ret = NT_STATUS_NO_MEMORY;
goto done;
}
DEBUG(10, ("Fetching record %s\n", keystr));
/* Check if sid is present in database */
ret = dbwrap_fetch_bystring(ctx->db, tmp_ctx, keystr, &data);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(10, ("Record %s not found\n", keystr));
ret = NT_STATUS_NONE_MAPPED;
goto done;
}
/* What type of record is this ? */
if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) {
/* Try a UID record. */
map->xid.id = rec_id;
map->xid.type = ID_TYPE_UID;
DEBUG(10,
("Found uid record %s -> %s \n", keystr,
(const char *)data.dptr));
ret = NT_STATUS_OK;
} else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) {
/* Try a GID record. */
map->xid.id = rec_id;
map->xid.type = ID_TYPE_GID;
DEBUG(10,
("Found gid record %s -> %s \n", keystr,
(const char *)data.dptr));
ret = NT_STATUS_OK;
} else { /* Unknown record type ! */
DEBUG(2,
("Found INVALID record %s -> %s\n", keystr,
(const char *)data.dptr));
ret = NT_STATUS_INTERNAL_DB_ERROR;
goto done;
}
/* apply filters before returning result */
if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
DEBUG(5,
("Requested id (%u) out of range (%u - %u). Filtered!\n",
map->xid.id, dom->low_id, dom->high_id));
ret = NT_STATUS_NONE_MAPPED;
}
done:
talloc_free(tmp_ctx);
return ret;
}
/**********************************
lookup a set of sids
**********************************/
struct idmap_tdb_common_sids_to_unixids_context {
struct idmap_domain *dom;
struct id_map **ids;
bool allocate_unmapped;
NTSTATUS(*sid_to_unixid_fn) (struct idmap_domain * dom,
struct id_map * map);
};
static NTSTATUS idmap_tdb_common_sids_to_unixids_action(struct db_context *db,
void *private_data)
{
struct idmap_tdb_common_sids_to_unixids_context *state = private_data;
size_t i, num_mapped = 0;
NTSTATUS ret = NT_STATUS_OK;
DEBUG(10, ("idmap_tdb_common_sids_to_unixids: "
" domain: [%s], allocate: %s\n",
state->dom->name, state->allocate_unmapped ? "yes" : "no"));
for (i = 0; state->ids[i]; i++) {
if ((state->ids[i]->status == ID_UNKNOWN) ||
/* retry if we could not map in previous run: */
(state->ids[i]->status == ID_UNMAPPED)) {
NTSTATUS ret2;
ret2 = state->sid_to_unixid_fn(state->dom,
state->ids[i]);
if (!NT_STATUS_IS_OK(ret2)) {
/* if it is just a failed mapping, continue */
if (NT_STATUS_EQUAL
(ret2, NT_STATUS_NONE_MAPPED)) {
/* make sure it is marked as unmapped */
state->ids[i]->status = ID_UNMAPPED;
ret = STATUS_SOME_UNMAPPED;
} else {
/*
* some fatal error occurred,
* return immediately
*/
ret = ret2;
goto done;
}
} else {
/* all ok, id is mapped */
state->ids[i]->status = ID_MAPPED;
}
}
if (state->ids[i]->status == ID_MAPPED) {
num_mapped += 1;
}
if ((state->ids[i]->status == ID_UNMAPPED) &&
state->allocate_unmapped) {
ret =
idmap_tdb_common_new_mapping(state->dom,
state->ids[i]);
if (!NT_STATUS_IS_OK(ret)) {
goto done;
}
num_mapped += 1;
}
}
done:
if (NT_STATUS_IS_OK(ret) ||
NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED)) {
if (i == 0 || num_mapped == 0) {
ret = NT_STATUS_NONE_MAPPED;
} else if (num_mapped < i) {
ret = STATUS_SOME_UNMAPPED;
} else {
ret = NT_STATUS_OK;
}
}
return ret;
}
NTSTATUS idmap_tdb_common_sids_to_unixids(struct idmap_domain * dom,
struct id_map ** ids)
{
NTSTATUS ret;
int i;
struct idmap_tdb_common_sids_to_unixids_context state;
struct idmap_tdb_common_context *ctx;
ctx =
talloc_get_type_abort(dom->private_data,
struct idmap_tdb_common_context);
/* initialize the status to avoid surprise */
for (i = 0; ids[i]; i++) {
ids[i]->status = ID_UNKNOWN;
}
state.dom = dom;
state.ids = ids;
state.allocate_unmapped = false;
if (ctx->sid_to_unixid_fn == NULL) {
state.sid_to_unixid_fn = idmap_tdb_common_sid_to_unixid;
} else {
state.sid_to_unixid_fn = ctx->sid_to_unixid_fn;
}
ret = idmap_tdb_common_sids_to_unixids_action(ctx->db, &state);
if ( (NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED) ||
NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) &&
!dom->read_only) {
state.allocate_unmapped = true;
ret = dbwrap_trans_do(ctx->db,
idmap_tdb_common_sids_to_unixids_action,
&state);
}
return ret;
}