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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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* 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 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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/*******************************************************************
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Create the share security tdb.
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********************************************************************/
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static TDB_CONTEXT *share_tdb; /* 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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static struct generic_mapping file_generic_mapping = {
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BOOL share_info_db_init(void)
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const char *vstring = "INFO/version";
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share_tdb = tdb_open_log(lock_path("share_info.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
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DEBUG(0,("Failed to open share info database %s (%s)\n",
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lock_path("share_info.tdb"), strerror(errno) ));
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/* handle a Samba upgrade */
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tdb_lock_bystring(share_tdb, vstring);
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/* Cope with byte-reversed older versions of the db. */
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vers_id = tdb_fetch_int32(share_tdb, vstring);
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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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tdb_store_int32(share_tdb, vstring, SHARE_DATABASE_VERSION_V2);
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vers_id = SHARE_DATABASE_VERSION_V2;
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if (vers_id != SHARE_DATABASE_VERSION_V2) {
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tdb_traverse(share_tdb, tdb_traverse_delete_fn, NULL);
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tdb_store_int32(share_tdb, vstring, SHARE_DATABASE_VERSION_V2);
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tdb_unlock_bystring(share_tdb, vstring);
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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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uint32 spec_access = def_access;
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se_map_generic(&spec_access, &file_generic_mapping);
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init_sec_access(&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, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL, psa, psize);
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DEBUG(0,("get_share_security: Failed to make SEC_DESC.\n"));
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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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SEC_DESC *psd = NULL;
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if (!share_info_db_init()) {
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/* Fetch security descriptor from tdb */
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slprintf(key, sizeof(key)-1, "SECDESC/%s", servicename);
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if (tdb_prs_fetch(share_tdb, key, &ps, ctx)!=0 ||
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!sec_io_desc("get_share_security", &psd, &ps, 1)) {
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DEBUG(4, ("get_share_security: using default secdesc for %s\n",
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return get_share_security_default(ctx, psize, GENERIC_ALL_ACCESS);
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*psize = sec_desc_size(psd);
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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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TALLOC_CTX *mem_ctx = NULL;
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if (!share_info_db_init()) {
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mem_ctx = talloc_init("set_share_security");
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prs_init(&ps, (uint32)sec_desc_size(psd), mem_ctx, MARSHALL);
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if (!sec_io_desc("share_security", &psd, &ps, 1))
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slprintf(key, sizeof(key)-1, "SECDESC/%s", share_name);
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if (tdb_prs_store(share_tdb, key, &ps)==0) {
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DEBUG(5,("set_share_security: stored secdesc for %s\n", share_name ));
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DEBUG(1,("set_share_security: Failed to store secdesc for %s\n", share_name ));
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/* Free malloc'ed memory */
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talloc_destroy(mem_ctx);
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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 struct share_params *params)
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slprintf(key, sizeof(key)-1, "SECDESC/%s",
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lp_servicename(params->service));
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kbuf.dsize = strlen(key)+1;
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if (tdb_trans_delete(share_tdb, kbuf) != 0) {
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DEBUG(0,("delete_share_security: Failed to delete entry for share %s\n",
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lp_servicename(params->service) ));
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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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TALLOC_CTX *mem_ctx = NULL;
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SEC_DESC *psd = NULL;
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if (!(mem_ctx = talloc_init("share_access_check"))) {
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psd = get_share_security(mem_ctx, sharename, &sd_size);
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TALLOC_FREE(mem_ctx);
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ret = se_access_check(psd, token, desired_access, &granted, &status);
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talloc_destroy(mem_ctx);
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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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const char *pacl = acl_str;
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SEC_ACE *ace_list = NULL;
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SEC_DESC *psd = NULL;
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/* If the acl string is blank return "Everyone:R" */
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SEC_DESC *default_psd = get_share_security_default(ctx, &s_size, GENERIC_READ_ACCESS);
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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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for (i = 0; i < num_aces; i++) {
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uint8 type = SEC_ACE_TYPE_ACCESS_ALLOWED;
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if (!next_token(&pacl, sidstr, ":", sizeof(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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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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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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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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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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DEBUG(0,("parse_usershare_acl: unknown acl type at %s.\n",
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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++; /* Go past any ',' */
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se_map_generic(&s_access, &file_generic_mapping);
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init_sec_access(&sa, g_access | s_access );
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init_sec_ace(&ace_list[i], &sid, type, sa, 0);
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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, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL, psa, &sd_size);
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DEBUG(0,("parse_usershare_acl: Failed to make SEC_DESC.\n"));