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https://github.com/samba-team/samba.git
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6c55518d47
This is a small performance optimization. Instead of opening the tdb on every smb connection in the forked child process, we now open it in the parent and share the fd. This also reduces the total fd usage in the system.
404 lines
10 KiB
C
404 lines
10 KiB
C
/*
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* Unix SMB/Netbios implementation.
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* SEC_DESC handling functions
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* Copyright (C) Jeremy R. Allison 1995-2003.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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/*******************************************************************
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Create the share security tdb.
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********************************************************************/
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static struct db_context *share_db; /* used for share security descriptors */
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#define SHARE_DATABASE_VERSION_V1 1
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#define SHARE_DATABASE_VERSION_V2 2 /* version id in little endian. */
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/* Map generic permissions to file object specific permissions */
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extern const struct generic_mapping file_generic_mapping;
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static int delete_fn(struct db_record *rec, void *priv)
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{
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rec->delete_rec(rec);
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return 0;
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}
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bool share_info_db_init(void)
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{
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const char *vstring = "INFO/version";
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int32 vers_id;
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if (share_db != NULL) {
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return True;
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}
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share_db = db_open(NULL, state_path("share_info.tdb"), 0,
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TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
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if (share_db == NULL) {
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DEBUG(0,("Failed to open share info database %s (%s)\n",
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state_path("share_info.tdb"), strerror(errno) ));
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return False;
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}
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vers_id = dbwrap_fetch_int32(share_db, vstring);
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if (vers_id == SHARE_DATABASE_VERSION_V2) {
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return true;
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}
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if (share_db->transaction_start(share_db) != 0) {
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DEBUG(0, ("transaction_start failed\n"));
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TALLOC_FREE(share_db);
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return false;
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}
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vers_id = dbwrap_fetch_int32(share_db, vstring);
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if (vers_id == SHARE_DATABASE_VERSION_V2) {
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/*
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* Race condition
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*/
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if (share_db->transaction_cancel(share_db)) {
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smb_panic("transaction_cancel failed");
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}
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return true;
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}
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/* Cope with byte-reversed older versions of the db. */
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if ((vers_id == SHARE_DATABASE_VERSION_V1) || (IREV(vers_id) == SHARE_DATABASE_VERSION_V1)) {
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/* Written on a bigendian machine with old fetch_int code. Save as le. */
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if (dbwrap_store_int32(share_db, vstring,
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SHARE_DATABASE_VERSION_V2) != 0) {
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DEBUG(0, ("dbwrap_store_int32 failed\n"));
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goto cancel;
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}
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vers_id = SHARE_DATABASE_VERSION_V2;
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}
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if (vers_id != SHARE_DATABASE_VERSION_V2) {
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int ret;
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ret = share_db->traverse(share_db, delete_fn, NULL);
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if (ret < 0) {
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DEBUG(0, ("traverse failed\n"));
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goto cancel;
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}
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if (dbwrap_store_int32(share_db, vstring,
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SHARE_DATABASE_VERSION_V2) != 0) {
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DEBUG(0, ("dbwrap_store_int32 failed\n"));
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goto cancel;
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}
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}
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if (share_db->transaction_commit(share_db) != 0) {
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DEBUG(0, ("transaction_commit failed\n"));
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return false;
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}
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return true;
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cancel:
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if (share_db->transaction_cancel(share_db)) {
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smb_panic("transaction_cancel failed");
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}
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return false;
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}
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/*******************************************************************
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Fake up a Everyone, default access as a default.
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def_access is a GENERIC_XXX access mode.
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********************************************************************/
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SEC_DESC *get_share_security_default( TALLOC_CTX *ctx, size_t *psize, uint32 def_access)
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{
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uint32_t sa;
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SEC_ACE ace;
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SEC_ACL *psa = NULL;
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SEC_DESC *psd = NULL;
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uint32 spec_access = def_access;
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se_map_generic(&spec_access, &file_generic_mapping);
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sa = (def_access | spec_access );
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init_sec_ace(&ace, &global_sid_World, SEC_ACE_TYPE_ACCESS_ALLOWED, sa, 0);
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if ((psa = make_sec_acl(ctx, NT4_ACL_REVISION, 1, &ace)) != NULL) {
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psd = make_sec_desc(ctx, SECURITY_DESCRIPTOR_REVISION_1,
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SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL,
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psa, psize);
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}
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if (!psd) {
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DEBUG(0,("get_share_security: Failed to make SEC_DESC.\n"));
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return NULL;
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}
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return psd;
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}
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/*******************************************************************
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Pull a security descriptor from the share tdb.
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********************************************************************/
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SEC_DESC *get_share_security( TALLOC_CTX *ctx, const char *servicename,
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size_t *psize)
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{
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char *key;
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SEC_DESC *psd = NULL;
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TDB_DATA data;
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NTSTATUS status;
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if (!share_info_db_init()) {
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return NULL;
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}
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if (!(key = talloc_asprintf(ctx, "SECDESC/%s", servicename))) {
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DEBUG(0, ("talloc_asprintf failed\n"));
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return NULL;
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}
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data = dbwrap_fetch_bystring(share_db, talloc_tos(), key);
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TALLOC_FREE(key);
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if (data.dptr == NULL) {
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return get_share_security_default(ctx, psize,
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GENERIC_ALL_ACCESS);
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}
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status = unmarshall_sec_desc(ctx, data.dptr, data.dsize, &psd);
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TALLOC_FREE(data.dptr);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0, ("unmarshall_sec_desc failed: %s\n",
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nt_errstr(status)));
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return NULL;
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}
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if (psd)
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*psize = ndr_size_security_descriptor(psd, NULL, 0);
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return psd;
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}
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/*******************************************************************
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Store a security descriptor in the share db.
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********************************************************************/
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bool set_share_security(const char *share_name, SEC_DESC *psd)
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{
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TALLOC_CTX *frame;
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char *key;
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bool ret = False;
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TDB_DATA blob;
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NTSTATUS status;
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if (!share_info_db_init()) {
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return False;
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}
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frame = talloc_stackframe();
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status = marshall_sec_desc(frame, psd, &blob.dptr, &blob.dsize);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0, ("marshall_sec_desc failed: %s\n",
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nt_errstr(status)));
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goto out;
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}
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if (!(key = talloc_asprintf(frame, "SECDESC/%s", share_name))) {
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DEBUG(0, ("talloc_asprintf failed\n"));
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goto out;
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}
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status = dbwrap_trans_store(share_db, string_term_tdb_data(key), blob,
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TDB_REPLACE);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("set_share_security: Failed to store secdesc for "
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"%s: %s\n", share_name, nt_errstr(status)));
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goto out;
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}
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DEBUG(5,("set_share_security: stored secdesc for %s\n", share_name ));
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ret = True;
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out:
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TALLOC_FREE(frame);
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return ret;
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}
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/*******************************************************************
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Delete a security descriptor.
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********************************************************************/
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bool delete_share_security(const char *servicename)
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{
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TDB_DATA kbuf;
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char *key;
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NTSTATUS status;
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if (!share_info_db_init()) {
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return False;
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}
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if (!(key = talloc_asprintf(talloc_tos(), "SECDESC/%s",
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servicename))) {
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return False;
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}
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kbuf = string_term_tdb_data(key);
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status = dbwrap_trans_delete(share_db, kbuf);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0, ("delete_share_security: Failed to delete entry for "
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"share %s: %s\n", servicename, nt_errstr(status)));
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return False;
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}
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return True;
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}
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/*******************************************************************
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Can this user access with share with the required permissions ?
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********************************************************************/
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bool share_access_check(const NT_USER_TOKEN *token, const char *sharename,
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uint32 desired_access)
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{
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uint32 granted;
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NTSTATUS status;
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SEC_DESC *psd = NULL;
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size_t sd_size;
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psd = get_share_security(talloc_tos(), sharename, &sd_size);
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if (!psd) {
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return True;
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}
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status = se_access_check(psd, token, desired_access, &granted);
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TALLOC_FREE(psd);
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return NT_STATUS_IS_OK(status);
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}
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/***************************************************************************
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Parse the contents of an acl string from a usershare file.
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***************************************************************************/
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bool parse_usershare_acl(TALLOC_CTX *ctx, const char *acl_str, SEC_DESC **ppsd)
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{
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size_t s_size = 0;
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const char *pacl = acl_str;
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int num_aces = 0;
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SEC_ACE *ace_list = NULL;
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SEC_ACL *psa = NULL;
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SEC_DESC *psd = NULL;
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size_t sd_size = 0;
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int i;
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*ppsd = NULL;
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/* If the acl string is blank return "Everyone:R" */
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if (!*acl_str) {
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SEC_DESC *default_psd = get_share_security_default(ctx, &s_size, GENERIC_READ_ACCESS);
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if (!default_psd) {
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return False;
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}
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*ppsd = default_psd;
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return True;
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}
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num_aces = 1;
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/* Add the number of ',' characters to get the number of aces. */
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num_aces += count_chars(pacl,',');
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ace_list = TALLOC_ARRAY(ctx, SEC_ACE, num_aces);
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if (!ace_list) {
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return False;
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}
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for (i = 0; i < num_aces; i++) {
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uint32_t sa;
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uint32 g_access;
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uint32 s_access;
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DOM_SID sid;
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char *sidstr;
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enum security_ace_type type = SEC_ACE_TYPE_ACCESS_ALLOWED;
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if (!next_token_talloc(ctx, &pacl, &sidstr, ":")) {
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DEBUG(0,("parse_usershare_acl: malformed usershare acl looking "
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"for ':' in string '%s'\n", pacl));
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return False;
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}
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if (!string_to_sid(&sid, sidstr)) {
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DEBUG(0,("parse_usershare_acl: failed to convert %s to sid.\n",
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sidstr ));
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return False;
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}
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switch (*pacl) {
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case 'F': /* Full Control, ie. R+W */
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case 'f': /* Full Control, ie. R+W */
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s_access = g_access = GENERIC_ALL_ACCESS;
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break;
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case 'R': /* Read only. */
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case 'r': /* Read only. */
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s_access = g_access = GENERIC_READ_ACCESS;
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break;
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case 'D': /* Deny all to this SID. */
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case 'd': /* Deny all to this SID. */
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type = SEC_ACE_TYPE_ACCESS_DENIED;
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s_access = g_access = GENERIC_ALL_ACCESS;
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break;
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default:
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DEBUG(0,("parse_usershare_acl: unknown acl type at %s.\n",
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pacl ));
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return False;
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}
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pacl++;
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if (*pacl && *pacl != ',') {
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DEBUG(0,("parse_usershare_acl: bad acl string at %s.\n",
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pacl ));
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return False;
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}
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pacl++; /* Go past any ',' */
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se_map_generic(&s_access, &file_generic_mapping);
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sa = (g_access | s_access);
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init_sec_ace(&ace_list[i], &sid, type, sa, 0);
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}
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if ((psa = make_sec_acl(ctx, NT4_ACL_REVISION, num_aces, ace_list)) != NULL) {
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psd = make_sec_desc(ctx, SECURITY_DESCRIPTOR_REVISION_1,
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SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL,
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psa, &sd_size);
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}
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if (!psd) {
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DEBUG(0,("parse_usershare_acl: Failed to make SEC_DESC.\n"));
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return False;
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}
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*ppsd = psd;
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return True;
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}
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