From 8daa83a594a2e98f39d764422bfbdbc62c9efd44 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 19:20:00 +0200
Subject: Adding upstream version 2:4.20.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 source3/passdb/account_pol.c | 494 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 494 insertions(+)
 create mode 100644 source3/passdb/account_pol.c

(limited to 'source3/passdb/account_pol.c')

diff --git a/source3/passdb/account_pol.c b/source3/passdb/account_pol.c
new file mode 100644
index 0000000..34c0d72
--- /dev/null
+++ b/source3/passdb/account_pol.c
@@ -0,0 +1,494 @@
+/*
+ *  Unix SMB/CIFS implementation.
+ *  account policy storage
+ *  Copyright (C) Jean François Micouleau      1998-2001
+ *  Copyright (C) Andrew Bartlett              2002
+ *  Copyright (C) Guenther Deschner            2004-2005
+ *
+ *  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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "passdb.h"
+#include "dbwrap/dbwrap.h"
+#include "dbwrap/dbwrap_open.h"
+#include "../libcli/security/security.h"
+#include "lib/privileges.h"
+#include "lib/gencache.h"
+#include "lib/util/smb_strtox.h"
+
+static struct db_context *db;
+
+/* cache all entries for 60 seconds for to save ldap-queries (cache is updated
+ * after this period if admins do not use pdbedit or usermanager but manipulate
+ * ldap directly) - gd */
+
+#define DATABASE_VERSION 	3
+#define AP_TTL			60
+
+
+struct ap_table {
+	enum pdb_policy_type type;
+	const char *string;
+	uint32_t default_val;
+	const char *description;
+	const char *ldap_attr;
+};
+
+static const struct ap_table account_policy_names[] = {
+	{PDB_POLICY_MIN_PASSWORD_LEN, "min password length", MINPASSWDLENGTH,
+		"Minimal password length (default: 5)",
+		"sambaMinPwdLength" },
+
+	{PDB_POLICY_PASSWORD_HISTORY, "password history", 0,
+		"Length of Password History Entries (default: 0 => off)",
+		"sambaPwdHistoryLength" },
+
+	{PDB_POLICY_USER_MUST_LOGON_TO_CHG_PASS, "user must logon to change password", 0,
+		"Force Users to logon for password change (default: 0 => off, 2 => on)",
+		"sambaLogonToChgPwd" },
+
+	{PDB_POLICY_MAX_PASSWORD_AGE, "maximum password age", (uint32_t) -1,
+		"Maximum password age, in seconds (default: -1 => never expire passwords)",
+		"sambaMaxPwdAge" },
+
+	{PDB_POLICY_MIN_PASSWORD_AGE,"minimum password age", 0,
+		"Minimal password age, in seconds (default: 0 => allow immediate password change)",
+		"sambaMinPwdAge" },
+
+	{PDB_POLICY_LOCK_ACCOUNT_DURATION, "lockout duration", 30,
+		"Lockout duration in minutes (default: 30, -1 => forever)",
+		"sambaLockoutDuration" },
+
+	{PDB_POLICY_RESET_COUNT_TIME, "reset count minutes", 30,
+		"Reset time after lockout in minutes (default: 30)",
+		"sambaLockoutObservationWindow" },
+
+	{PDB_POLICY_BAD_ATTEMPT_LOCKOUT, "bad lockout attempt", 0,
+		"Lockout users after bad logon attempts (default: 0 => off)",
+		"sambaLockoutThreshold" },
+
+	{PDB_POLICY_TIME_TO_LOGOUT, "disconnect time", (uint32_t) -1,
+		"Disconnect Users outside logon hours (default: -1 => off, 0 => on)",
+		"sambaForceLogoff" },
+
+	{PDB_POLICY_REFUSE_MACHINE_PW_CHANGE, "refuse machine password change", 0,
+		"Allow Machine Password changes (default: 0 => off)",
+		"sambaRefuseMachinePwdChange" },
+
+	{0, NULL, 0, "", NULL}
+};
+
+void account_policy_names_list(TALLOC_CTX *mem_ctx, const char ***names, int *num_names)
+{
+	const char **nl;
+	int i, count = ARRAY_SIZE(account_policy_names);
+
+	nl = talloc_array(mem_ctx, const char *, count);
+	if (!nl) {
+		*num_names = 0;
+		return;
+	}
+	for (i=0; i<count; i++) {
+		nl[i] = account_policy_names[i].string;
+	}
+	/* Do not return the last null entry */
+	*num_names = count-1;
+	*names = nl;
+	return;
+}
+
+/****************************************************************************
+Get the account policy name as a string from its #define'ed number
+****************************************************************************/
+
+const char *decode_account_policy_name(enum pdb_policy_type type)
+{
+	int i;
+	for (i=0; account_policy_names[i].string; i++) {
+		if (type == account_policy_names[i].type) {
+			return account_policy_names[i].string;
+		}
+	}
+	return NULL;
+}
+
+/****************************************************************************
+Get the account policy LDAP attribute as a string from its #define'ed number
+****************************************************************************/
+
+const char *get_account_policy_attr(enum pdb_policy_type type)
+{
+	int i;
+	for (i=0; account_policy_names[i].type; i++) {
+		if (type == account_policy_names[i].type) {
+			return account_policy_names[i].ldap_attr;
+		}
+	}
+	return NULL;
+}
+
+/****************************************************************************
+Get the account policy description as a string from its #define'ed number
+****************************************************************************/
+
+const char *account_policy_get_desc(enum pdb_policy_type type)
+{
+	int i;
+	for (i=0; account_policy_names[i].string; i++) {
+		if (type == account_policy_names[i].type) {
+			return account_policy_names[i].description;
+		}
+	}
+	return NULL;
+}
+
+/****************************************************************************
+Get the account policy name as a string from its #define'ed number
+****************************************************************************/
+
+enum pdb_policy_type account_policy_name_to_typenum(const char *name)
+{
+	int i;
+	for (i=0; account_policy_names[i].string; i++) {
+		if (strcmp(name, account_policy_names[i].string) == 0) {
+			return account_policy_names[i].type;
+		}
+	}
+	return 0;
+}
+
+/*****************************************************************************
+Get default value for account policy
+*****************************************************************************/
+
+bool account_policy_get_default(enum pdb_policy_type type, uint32_t *val)
+{
+	int i;
+	for (i=0; account_policy_names[i].type; i++) {
+		if (account_policy_names[i].type == type) {
+			*val = account_policy_names[i].default_val;
+			return True;
+		}
+	}
+	DEBUG(0,("no default for account_policy index %d found. This should never happen\n",
+		type));
+	return False;
+}
+
+/*****************************************************************************
+ Set default for a type if it is empty
+*****************************************************************************/
+
+static bool account_policy_set_default_on_empty(enum pdb_policy_type type)
+{
+
+	uint32_t value;
+
+	if (!account_policy_get(type, &value) &&
+	    !account_policy_get_default(type, &value)) {
+		return False;
+	}
+
+	return account_policy_set(type, value);
+}
+
+/*****************************************************************************
+ Open the account policy tdb.
+***`*************************************************************************/
+
+bool init_account_policy(void)
+{
+
+	const char *vstring = "INFO/version";
+	uint32_t version = 0;
+	int i;
+	NTSTATUS status;
+	char *db_path;
+
+	if (db != NULL) {
+		return True;
+	}
+
+	db_path = state_path(talloc_tos(), "account_policy.tdb");
+	if (db_path == NULL) {
+		return false;
+	}
+
+	db = db_open(NULL, db_path, 0, TDB_DEFAULT,
+		     O_RDWR, 0600, DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
+
+	if (db == NULL) { /* the account policies files does not exist or open
+			   * failed, try to create a new one */
+		db = db_open(NULL, db_path, 0,
+			     TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
+			     DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
+		if (db == NULL) {
+			DEBUG(0,("Failed to open account policy database\n"));
+			TALLOC_FREE(db_path);
+			return False;
+		}
+	}
+	TALLOC_FREE(db_path);
+
+	status = dbwrap_fetch_uint32_bystring(db, vstring, &version);
+	if (!NT_STATUS_IS_OK(status)) {
+		version = 0;
+	}
+
+	if (version == DATABASE_VERSION) {
+		return true;
+	}
+
+	/* handle a Samba upgrade */
+
+	if (dbwrap_transaction_start(db) != 0) {
+		DEBUG(0, ("transaction_start failed\n"));
+		TALLOC_FREE(db);
+		return false;
+	}
+
+	status = dbwrap_fetch_uint32_bystring(db, vstring, &version);
+	if (!NT_STATUS_IS_OK(status)) {
+		version = 0;
+	}
+
+	if (version == DATABASE_VERSION) {
+		/*
+		 * Race condition
+		 */
+		if (dbwrap_transaction_cancel(db)) {
+			smb_panic("transaction_cancel failed");
+		}
+		return true;
+	}
+
+	if (version != DATABASE_VERSION) {
+		status = dbwrap_store_uint32_bystring(db, vstring,
+						      DATABASE_VERSION);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(0, ("dbwrap_store_uint32_t failed: %s\n",
+				  nt_errstr(status)));
+			goto cancel;
+		}
+
+		for (i=0; account_policy_names[i].type; i++) {
+
+			if (!account_policy_set_default_on_empty(account_policy_names[i].type)) {
+				DEBUG(0,("failed to set default value in account policy tdb\n"));
+				goto cancel;
+			}
+		}
+	}
+
+	/* These exist by default on NT4 in [HKLM\SECURITY\Policy\Accounts] */
+
+	privilege_create_account( &global_sid_World );
+	privilege_create_account( &global_sid_Builtin_Account_Operators );
+	privilege_create_account( &global_sid_Builtin_Server_Operators );
+	privilege_create_account( &global_sid_Builtin_Print_Operators );
+	privilege_create_account( &global_sid_Builtin_Backup_Operators );
+
+	/* BUILTIN\Administrators get everything -- *always* */
+
+	if ( lp_enable_privileges() ) {
+		if ( !grant_all_privileges( &global_sid_Builtin_Administrators ) ) {
+			DEBUG(1,("init_account_policy: Failed to grant privileges "
+				"to BUILTIN\\Administrators!\n"));
+		}
+	}
+
+	if (dbwrap_transaction_commit(db) != 0) {
+		DEBUG(0, ("transaction_commit failed\n"));
+		TALLOC_FREE(db);
+		return false;
+	}
+
+	return True;
+
+ cancel:
+	if (dbwrap_transaction_cancel(db)) {
+		smb_panic("transaction_cancel failed");
+	}
+	TALLOC_FREE(db);
+
+	return false;
+}
+
+/*****************************************************************************
+Get an account policy (from tdb)
+*****************************************************************************/
+
+bool account_policy_get(enum pdb_policy_type type, uint32_t *value)
+{
+	const char *name;
+	uint32_t regval;
+	NTSTATUS status;
+
+	if (!init_account_policy()) {
+		return False;
+	}
+
+	if (value) {
+		*value = 0;
+	}
+
+	name = decode_account_policy_name(type);
+	if (name == NULL) {
+		DEBUG(1, ("account_policy_get: Field %d is not a valid account policy type!  Cannot get, returning 0.\n", type));
+		return False;
+	}
+
+	status = dbwrap_fetch_uint32_bystring(db, name, &regval);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(2, ("account_policy_get: tdb_fetch_uint32_t failed for type %d (%s), returning 0\n", type, name));
+		return False;
+	}
+
+	if (value) {
+		*value = regval;
+	}
+
+	DEBUG(10,("account_policy_get: name: %s, val: %d\n", name, regval));
+	return True;
+}
+
+
+/****************************************************************************
+Set an account policy (in tdb)
+****************************************************************************/
+
+bool account_policy_set(enum pdb_policy_type type, uint32_t value)
+{
+	const char *name;
+	NTSTATUS status;
+
+	if (!init_account_policy()) {
+		return False;
+	}
+
+	name = decode_account_policy_name(type);
+	if (name == NULL) {
+		DEBUG(1, ("Field %d is not a valid account policy type!  Cannot set.\n", type));
+		return False;
+	}
+
+	status = dbwrap_trans_store_uint32_bystring(db, name, value);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("store_uint32_t failed for type %d (%s) on value "
+			  "%u: %s\n", type, name, value, nt_errstr(status)));
+		return False;
+	}
+
+	DEBUG(10,("account_policy_set: name: %s, value: %d\n", name, value));
+
+	return True;
+}
+
+/****************************************************************************
+Set an account policy in the cache
+****************************************************************************/
+
+bool cache_account_policy_set(enum pdb_policy_type type, uint32_t value)
+{
+	const char *policy_name = NULL;
+	char *cache_key = NULL;
+	char *cache_value = NULL;
+	bool ret = False;
+
+	policy_name = decode_account_policy_name(type);
+	if (policy_name == NULL) {
+		DEBUG(0,("cache_account_policy_set: no policy found\n"));
+		return False;
+	}
+
+	if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
+		DEBUG(0, ("asprintf failed\n"));
+		goto done;
+	}
+
+	if (asprintf(&cache_value, "%lu\n", (unsigned long)value) < 0) {
+		DEBUG(0, ("asprintf failed\n"));
+		goto done;
+	}
+
+	DEBUG(10,("cache_account_policy_set: updating account pol cache\n"));
+
+	ret = gencache_set(cache_key, cache_value, time(NULL)+AP_TTL);
+
+ done:
+	SAFE_FREE(cache_key);
+	SAFE_FREE(cache_value);
+	return ret;
+}
+
+/*****************************************************************************
+Get an account policy from the cache
+*****************************************************************************/
+
+bool cache_account_policy_get(enum pdb_policy_type type, uint32_t *value)
+{
+	const char *policy_name = NULL;
+	char *cache_key = NULL;
+	char *cache_value = NULL;
+	bool ret = False;
+
+	policy_name = decode_account_policy_name(type);
+	if (policy_name == NULL) {
+		DEBUG(0,("cache_account_policy_set: no policy found\n"));
+		return False;
+	}
+
+	if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
+		DEBUG(0, ("asprintf failed\n"));
+		goto done;
+	}
+
+	if (gencache_get(cache_key, talloc_tos(), &cache_value, NULL)) {
+		int error = 0;
+		uint32_t tmp;
+
+		tmp = smb_strtoul(cache_value,
+				  NULL,
+				  10,
+				  &error,
+				  SMB_STR_STANDARD);
+		if (error != 0) {
+			goto done;
+		}
+		*value = tmp;
+		ret = True;
+	}
+
+ done:
+	SAFE_FREE(cache_key);
+	TALLOC_FREE(cache_value);
+	return ret;
+}
+
+/****************************************************************************
+****************************************************************************/
+
+struct db_context *get_account_pol_db( void )
+{
+
+	if ( db == NULL ) {
+		if ( !init_account_policy() ) {
+			return NULL;
+		}
+	}
+
+	return db;
+}
-- 
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