/*
   Unix SMB/CIFS mplementation.
   LDAP protocol helper functions for SAMBA
   Copyright (C) Jean François Micouleau	1998
   Copyright (C) Gerald Carter			2001-2003
   Copyright (C) Shahms King			2001
   Copyright (C) Andrew Bartlett		2002-2003
   Copyright (C) Stefan (metze) Metzmacher	2002-2003

   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 "smbldap.h"
#include "passdb.h"
#include "passdb/pdb_ldap_util.h"
#include "passdb/pdb_ldap_schema.h"
#include "libcli/security/dom_sid.h"

/**********************************************************************
 Add the account-policies below the sambaDomain object to LDAP,
*********************************************************************/

static NTSTATUS add_new_domain_account_policies(struct smbldap_state *ldap_state,
						const char *domain_name)
{
	NTSTATUS ntstatus = NT_STATUS_UNSUCCESSFUL;
	int i, rc;
	uint32_t policy_default;
	const char *policy_attr = NULL;
	char *dn = NULL;
	LDAPMod **mods = NULL;
	char *escape_domain_name;

	DEBUG(3,("add_new_domain_account_policies: Adding new account policies for domain\n"));

	escape_domain_name = escape_rdn_val_string_alloc(domain_name);
	if (!escape_domain_name) {
		DEBUG(0, ("Out of memory!\n"));
		return NT_STATUS_NO_MEMORY;
	}

	if (asprintf(&dn, "%s=%s,%s",
		get_attr_key2string(dominfo_attr_list, LDAP_ATTR_DOMAIN),
		escape_domain_name, lp_ldap_suffix(talloc_tos())) < 0) {
		SAFE_FREE(escape_domain_name);
		return NT_STATUS_NO_MEMORY;
	}

	SAFE_FREE(escape_domain_name);

	for (i=1; decode_account_policy_name(i) != NULL; i++) {
		char *val = NULL;

		policy_attr = get_account_policy_attr(i);
		if (!policy_attr) {
			DEBUG(0,("add_new_domain_account_policies: ops. no policy!\n"));
			continue;
		}

		if (!account_policy_get_default(i, &policy_default)) {
			DEBUG(0,("add_new_domain_account_policies: failed to get default account policy\n"));
			SAFE_FREE(dn);
			return ntstatus;
		}

		DEBUG(10,("add_new_domain_account_policies: adding \"%s\" with value: %d\n", policy_attr, policy_default));

		if (asprintf(&val, "%d", policy_default) < 0) {
			SAFE_FREE(dn);
			return NT_STATUS_NO_MEMORY;
		}

		smbldap_set_mod( &mods, LDAP_MOD_REPLACE, policy_attr, val);

		rc = smbldap_modify(ldap_state, dn, mods);

		SAFE_FREE(val);

		if (rc!=LDAP_SUCCESS) {
			char *ld_error = NULL;
			ldap_get_option(smbldap_get_ldap(ldap_state),
					LDAP_OPT_ERROR_STRING, &ld_error);
			DEBUG(1,("add_new_domain_account_policies: failed to add account policies to dn= %s with: %s\n\t%s\n",
				dn, ldap_err2string(rc),
				ld_error ? ld_error : "unknown"));
			SAFE_FREE(ld_error);
			SAFE_FREE(dn);
			ldap_mods_free(mods, True);
			return ntstatus;
		}
	}

	SAFE_FREE(dn);
	ldap_mods_free(mods, True);

	return NT_STATUS_OK;
}

/**********************************************************************
 Add the sambaDomain to LDAP, so we don't have to search for this stuff
 again.  This is a once-add operation for now.

 TODO:  Add other attributes, and allow modification.
*********************************************************************/

static NTSTATUS add_new_domain_info(struct smbldap_state *ldap_state,
                                    const char *domain_name)
{
	struct dom_sid_buf sid_string;
	fstring algorithmic_rid_base_string;
	char *filter = NULL;
	char *dn = NULL;
	LDAPMod **mods = NULL;
	int rc;
	LDAPMessage *result = NULL;
	int num_result;
	const char **attr_list;
	char *escape_domain_name;

	/* escape for filter */
	escape_domain_name = escape_ldap_string(talloc_tos(), domain_name);
	if (!escape_domain_name) {
		DEBUG(0, ("Out of memory!\n"));
		return NT_STATUS_NO_MEMORY;
	}

	if (asprintf(&filter, "(&(%s=%s)(objectclass=%s))",
		get_attr_key2string(dominfo_attr_list, LDAP_ATTR_DOMAIN),
			escape_domain_name, LDAP_OBJ_DOMINFO) < 0) {
		TALLOC_FREE(escape_domain_name);
		return NT_STATUS_NO_MEMORY;
	}

	TALLOC_FREE(escape_domain_name);

	attr_list = get_attr_list(NULL, dominfo_attr_list );
	rc = smbldap_search_suffix(ldap_state, filter, attr_list, &result);
	TALLOC_FREE( attr_list );
	SAFE_FREE(filter);

	if (rc != LDAP_SUCCESS) {
		return NT_STATUS_UNSUCCESSFUL;
	}

	num_result = ldap_count_entries(smbldap_get_ldap(ldap_state), result);

	if (num_result > 1) {
		DEBUG (0, ("add_new_domain_info: More than domain with that name exists: bailing "
			   "out!\n"));
		ldap_msgfree(result);
		return NT_STATUS_UNSUCCESSFUL;
	}

	/* Check if we need to add an entry */
	DEBUG(3,("add_new_domain_info: Adding new domain\n"));

	/* this time escape for DN */
	escape_domain_name = escape_rdn_val_string_alloc(domain_name);
	if (!escape_domain_name) {
		DEBUG(0, ("Out of memory!\n"));
		return NT_STATUS_NO_MEMORY;
	}

	if (asprintf(&dn, "%s=%s,%s",
		     get_attr_key2string(dominfo_attr_list, LDAP_ATTR_DOMAIN),
		     escape_domain_name, lp_ldap_suffix(talloc_tos())) < 0) {
		SAFE_FREE(escape_domain_name);
		return NT_STATUS_NO_MEMORY;
	}

	SAFE_FREE(escape_domain_name);

	/* Free original search */
	ldap_msgfree(result);

	/* make the changes - the entry *must* not already have samba
	 * attributes */

	smbldap_set_mod(&mods, LDAP_MOD_ADD,
			get_attr_key2string(dominfo_attr_list,
					    LDAP_ATTR_DOMAIN),
			domain_name);

	/* If we don't have an entry, then ask secrets.tdb for what it thinks.
	   It may choose to make it up */

	smbldap_set_mod(&mods, LDAP_MOD_ADD,
			get_attr_key2string(dominfo_attr_list,
					    LDAP_ATTR_DOM_SID),
			dom_sid_str_buf(get_global_sam_sid(), &sid_string));

	slprintf(algorithmic_rid_base_string,
		 sizeof(algorithmic_rid_base_string) - 1, "%i",
		 algorithmic_rid_base());
	smbldap_set_mod(&mods, LDAP_MOD_ADD,
			get_attr_key2string(dominfo_attr_list,
					    LDAP_ATTR_ALGORITHMIC_RID_BASE),
			algorithmic_rid_base_string);
	smbldap_set_mod(&mods, LDAP_MOD_ADD, "objectclass", LDAP_OBJ_DOMINFO);

	/* add the sambaNextUserRid attributes. */

	{
		uint32_t rid = BASE_RID;
		fstring rid_str;

		fstr_sprintf( rid_str, "%i", rid );
		DEBUG(10,("add_new_domain_info: setting next available user rid [%s]\n", rid_str));
		smbldap_set_mod(&mods, LDAP_MOD_ADD,
			get_attr_key2string(dominfo_attr_list,
					    LDAP_ATTR_NEXT_USERRID),
			rid_str);
        }


	rc = smbldap_add(ldap_state, dn, mods);

	if (rc!=LDAP_SUCCESS) {
		char *ld_error = NULL;
		ldap_get_option(smbldap_get_ldap(ldap_state),
				LDAP_OPT_ERROR_STRING, &ld_error);
		DEBUG(1,("add_new_domain_info: failed to add domain dn= %s with: %s\n\t%s\n",
			 dn, ldap_err2string(rc),
			 ld_error?ld_error:"unknown"));
		SAFE_FREE(ld_error);
		SAFE_FREE(dn);
		ldap_mods_free(mods, True);
		return NT_STATUS_UNSUCCESSFUL;
	}

	DEBUG(2,("add_new_domain_info: added: domain = %s in the LDAP database\n", domain_name));
	ldap_mods_free(mods, True);
	SAFE_FREE(dn);
	return NT_STATUS_OK;
}

/**********************************************************************
Search for the domain info entry
*********************************************************************/

NTSTATUS smbldap_search_domain_info(struct smbldap_state *ldap_state,
                                    LDAPMessage ** result, const char *domain_name,
                                    bool try_add)
{
	NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
	char *filter = NULL;
	int rc;
	const char **attr_list;
	int count;
	char *escape_domain_name;

	escape_domain_name = escape_ldap_string(talloc_tos(), domain_name);
	if (!escape_domain_name) {
		DEBUG(0, ("Out of memory!\n"));
		return NT_STATUS_NO_MEMORY;
	}

	if (asprintf(&filter, "(&(objectClass=%s)(%s=%s))",
		LDAP_OBJ_DOMINFO,
		get_attr_key2string(dominfo_attr_list, LDAP_ATTR_DOMAIN),
		escape_domain_name) < 0) {
		TALLOC_FREE(escape_domain_name);
		return NT_STATUS_NO_MEMORY;
	}

	TALLOC_FREE(escape_domain_name);

	DEBUG(2, ("smbldap_search_domain_info: Searching for:[%s]\n", filter));

	attr_list = get_attr_list( NULL, dominfo_attr_list );
	rc = smbldap_search_suffix(ldap_state, filter, attr_list , result);
	TALLOC_FREE( attr_list );

	if (rc != LDAP_SUCCESS) {
		DEBUG(2,("smbldap_search_domain_info: Problem during LDAPsearch: %s\n", ldap_err2string (rc)));
		DEBUG(2,("smbldap_search_domain_info: Query was: %s, %s\n", lp_ldap_suffix(talloc_tos()), filter));
		goto failed;
	}

	SAFE_FREE(filter);

	count = ldap_count_entries(smbldap_get_ldap(ldap_state), *result);

	if (count == 1) {
		return NT_STATUS_OK;
	}

	ldap_msgfree(*result);
	*result = NULL;

	if (count < 1) {

		DEBUG(3, ("smbldap_search_domain_info: Got no domain info entries for domain\n"));

		if (!try_add)
			goto failed;

		status = add_new_domain_info(ldap_state, domain_name);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0, ("smbldap_search_domain_info: Adding domain info for %s failed with %s\n",
				domain_name, nt_errstr(status)));
			goto failed;
		}

		status = add_new_domain_account_policies(ldap_state, domain_name);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0, ("smbldap_search_domain_info: Adding domain account policies for %s failed with %s\n",
				domain_name, nt_errstr(status)));
			goto failed;
		}

		return smbldap_search_domain_info(ldap_state, result, domain_name, False);

	}

	if (count > 1 ) {

		DEBUG(0, ("smbldap_search_domain_info: Got too many (%d) domain info entries for domain %s\n",
			  count, domain_name));
		goto failed;
	}

failed:
	return status;
}