/*
  *   Unreal Internet Relay Chat Daemon, src/modules/oper.c
  *   (C) 2000-2001 Carsten V. Munk and the UnrealIRCd Team
  *   Moved to modules by Fish (Justin Hammond)
  *
  *   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 1, 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 "unrealircd.h"
 
 #define MSG_OPER        "OPER"  /* OPER */
 
 ModuleHeader MOD_HEADER
   = {
 	"oper",	/* Name of module */
 	"5.0", /* Version */
 	"command /oper", /* Short description of module */
 	"UnrealIRCd Team",
 	"unrealircd-6",
     };
 
 /* Forward declarations */
 CMD_FUNC(cmd_oper);
 int _make_oper(Client *client, const char *operblock_name, const char *operclass, ConfigItem_class *clientclass, long modes, const char *snomask, const char *vhost, const char *autojoin_channels);
 int oper_connect(Client *client);
 
 MOD_TEST()
 {
 	MARK_AS_OFFICIAL_MODULE(modinfo);
 	EfunctionAdd(modinfo->handle, EFUNC_MAKE_OPER, _make_oper);
 	return MOD_SUCCESS;
 }
 
 MOD_INIT()
 {
 	MARK_AS_OFFICIAL_MODULE(modinfo);
 	CommandAdd(modinfo->handle, MSG_OPER, cmd_oper, MAXPARA, CMD_USER);
 	HookAdd(modinfo->handle, HOOKTYPE_LOCAL_CONNECT, 0, oper_connect);
 	return MOD_SUCCESS;
 }
 
 MOD_LOAD()
 {
 	return MOD_SUCCESS;
 }
 
 MOD_UNLOAD()
 {
 	return MOD_SUCCESS;
 }
 
 void set_oper_host(Client *client, const char *host)
 {
 	char uhost[HOSTLEN + USERLEN + 1];
 	char *p;
 	char newhost[HOSTLEN+1];
 
 	*newhost = '\0';
 	unreal_expand_string(host, newhost, sizeof(newhost), NULL, 0, client);
 	if (!valid_vhost(newhost))
 	{
 		sendnotice(client, "*** Unable to set vhost");
 		unreal_log(ULOG_WARNING, "oper", "OPER_VHOST_FAILED", client,
 		           "Unable to set vhost on oper $client.details. "
 		           "Vhost '$vhost_format' expanded to '$newhost' but is invalid.",
 		           log_data_string("vhost_format", host),
 		           log_data_string("newhost", newhost));
 		return;
 	}
 	host = newhost; /* Shadow... */
 
 	strlcpy(uhost, host, sizeof(uhost));
 
 	if ((p = strchr(uhost, '@')))
 	{
 		*p++ = '\0';
 		strlcpy(client->user->username, uhost, sizeof(client->user->username));
 		sendto_server(NULL, 0, 0, NULL, ":%s SETIDENT %s",
 		              client->id, client->user->username);
 		host = p;
 	}
 	safe_strdup(client->user->virthost, host);
 	if (MyConnect(client))
 		sendto_server(NULL, 0, 0, NULL, ":%s SETHOST :%s", client->id, client->user->virthost);
 	client->umodes |= UMODE_SETHOST|UMODE_HIDE;
 }
 
 int _make_oper(Client *client, const char *operblock_name, const char *operclass, ConfigItem_class *clientclass, long modes, const char *snomask, const char *vhost, const char *autojoin_channels)
 {
 	long old_umodes = client->umodes & ALL_UMODES;
 
 	if (!autojoin_channels)
 		autojoin_channels = OPER_AUTO_JOIN_CHANS;
 
 	userhost_save_current(client);
 
 	/* Put in the right class (if any) */
 	if (clientclass)
 	{
 		if (client->local->class)
 			client->local->class->clients--;
 		client->local->class = clientclass;
 		client->local->class->clients++;
 	}
 
 	/* set oper user modes */
 	client->umodes |= UMODE_OPER;
 	if (modes)
 		client->umodes |= modes; /* oper::modes */
 	else
 		client->umodes |= OPER_MODES; /* set::modes-on-oper */
 
 	/* oper::vhost */
 	if (vhost)
 	{
 		set_oper_host(client, vhost);
 	} else
 	if (iConf.oper_vhost)
 	{
 		set_oper_host(client, iConf.oper_vhost);
 	} else
 	if (IsHidden(client) && !client->user->virthost)
 	{
 		/* +x has just been set by modes-on-oper and no vhost. cloak the oper! */
 		safe_strdup(client->user->virthost, client->user->cloakedhost);
 	}
 
 	userhost_changed(client);
 
 	unreal_log(ULOG_INFO, "oper", "OPER_SUCCESS", client,
 		   "$client.details is now an IRC Operator [oper-block: $oper_block] [operclass: $operclass]",
 		   log_data_string("oper_block", operblock_name),
 		   log_data_string("operclass", operclass));
 
 	/* set oper snomasks */
 	if (snomask)
 		set_snomask(client, snomask); /* oper::snomask */
 	else
 		set_snomask(client, OPER_SNOMASK); /* set::snomask-on-oper */
 
 	send_umode_out(client, 1, old_umodes);
 	if (client->user->snomask)
 		sendnumeric(client, RPL_SNOMASK, client->user->snomask);
 
 	list_add(&client->special_node, &oper_list);
 
 	RunHook(HOOKTYPE_LOCAL_OPER, client, 1, operblock_name, operclass);
 
 	sendnumeric(client, RPL_YOUREOPER);
 
 	/* Update statistics */
 	if (IsInvisible(client) && !(old_umodes & UMODE_INVISIBLE))
 		irccounts.invisible++;
 	if (IsOper(client) && !IsHideOper(client))
 		irccounts.operators++;
 
 	if (SHOWOPERMOTD == 1)
 	{
 		const char *args[1] = { NULL };
 		do_cmd(client, NULL, "OPERMOTD", 1, args);
 	}
 
 	if (!BadPtr(autojoin_channels) && strcmp(autojoin_channels, "0"))
 	{
 		char *chans = strdup(autojoin_channels);
 		const char *args[3] = {
 			client->name,
 			chans,
 			NULL
 		};
 		do_cmd(client, NULL, "JOIN", 3, args);
 		safe_free(chans);
 		/* Theoretically the oper may be killed on join. Would be fun, though */
 		if (IsDead(client))
 			return 0;
 	}
 
 	return 1;
 }
 
 /*
 ** cmd_oper
 **	parv[1] = oper name
 **	parv[2] = oper password
 */
 CMD_FUNC(cmd_oper)
 {
 	ConfigItem_oper *operblock;
 	const char *operblock_name, *password;
 
 	if (!MyUser(client))
 		return;
 
 	if ((parc < 2) || BadPtr(parv[1]))
 	{
 		sendnumeric(client, ERR_NEEDMOREPARAMS, "OPER");
 		return;
 	}
 
 	if (SVSNOOP)
 	{
 		sendnotice(client,
 		    "*** This server is in NOOP mode, you cannot /oper");
 		return;
 	}
 
 	if (IsOper(client))
 	{
 		sendnotice(client, "You are already an IRC Operator. If you want to re-oper then de-oper first via /MODE yournick -o");
 		return;
 	}
 
 	operblock_name = parv[1];
 	password = (parc > 2) ? parv[2] : "";
 
 	/* set::plaintext-policy::oper 'deny' */
 	if (!IsSecure(client) && !IsLocalhost(client) && (iConf.plaintext_policy_oper == POLICY_DENY))
 	{
 		sendnotice_multiline(client, iConf.plaintext_policy_oper_message);
 		unreal_log(ULOG_WARNING, "oper", "OPER_FAILED", client,
 		           "Failed OPER attempt by $client.details [reason: $reason] [oper-block: $oper_block]",
 		           log_data_string("reason", "Not using TLS"),
 		           log_data_string("fail_type", "NO_TLS"),
 		           log_data_string("oper_block", parv[1]));
 		add_fake_lag(client, 7000);
 		return;
 	}
 
 	/* set::outdated-tls-policy::oper 'deny' */
 	if (IsSecure(client) && (iConf.outdated_tls_policy_oper == POLICY_DENY) && outdated_tls_client(client))
 	{
 		sendnotice(client, "%s", outdated_tls_client_build_string(iConf.outdated_tls_policy_oper_message, client));
 		unreal_log(ULOG_WARNING, "oper", "OPER_FAILED", client,
 		           "Failed OPER attempt by $client.details [reason: $reason] [oper-block: $oper_block]",
 		           log_data_string("reason", "Outdated TLS protocol or cipher"),
 		           log_data_string("fail_type", "OUTDATED_TLS_PROTOCOL_OR_CIPHER"),
 		           log_data_string("oper_block", parv[1]));
 		add_fake_lag(client, 7000);
 		return;
 	}
 
 	if (!(operblock = find_oper(operblock_name)))
 	{
 		sendnumeric(client, ERR_NOOPERHOST);
 		unreal_log(ULOG_WARNING, "oper", "OPER_FAILED", client,
 		           "Failed OPER attempt by $client.details [reason: $reason] [oper-block: $oper_block]",
 		           log_data_string("reason", "Unknown oper name"),
 		           log_data_string("fail_type", "UNKNOWN_OPER_NAME"),
 		           log_data_string("oper_block", parv[1]));
 		add_fake_lag(client, 7000);
 		return;
 	}
 
 	/* Below here, the oper block exists, any errors here we take (even)
 	 * more seriously, they are logged as errors instead of warnings.
 	 */
 
 	if (!user_allowed_by_security_group(client, operblock->match))
 	{
 		sendnumeric(client, ERR_NOOPERHOST);
 		unreal_log(ULOG_ERROR, "oper", "OPER_FAILED", client,
 		           "Failed OPER attempt by $client.details [reason: $reason] [oper-block: $oper_block]",
 		           log_data_string("reason", "Host does not match"),
 		           log_data_string("fail_type", "NO_HOST_MATCH"),
 		           log_data_string("oper_block", parv[1]));
 		add_fake_lag(client, 7000);
 		return;
 	}
 
 	if (operblock->auth && !Auth_Check(client, operblock->auth, password))
 	{
 		sendnumeric(client, ERR_PASSWDMISMATCH);
 		if (FAILOPER_WARN)
 			sendnotice(client,
 			    "*** Your attempt has been logged.");
 		unreal_log(ULOG_ERROR, "oper", "OPER_FAILED", client,
 		           "Failed OPER attempt by $client.details [reason: $reason] [oper-block: $oper_block]",
 		           log_data_string("reason", "Authentication failed"),
 		           log_data_string("fail_type", "AUTHENTICATION_FAILED"),
 		           log_data_string("oper_block", parv[1]));
 		add_fake_lag(client, 7000);
 		return;
 	}
 
 	/* Authentication of the oper succeeded (like, password, ssl cert),
 	 * but we still have some other restrictions to check below as well,
 	 * like 'require-modes' and 'maxlogins'...
 	 */
 
 	/* Check oper::require_modes */
 	if (operblock->require_modes & ~client->umodes)
 	{
 		sendnumericfmt(client, ERR_NOOPERHOST, ":You are missing user modes required to OPER");
 		unreal_log(ULOG_WARNING, "oper", "OPER_FAILED", client,
 		           "Failed OPER attempt by $client.details [reason: $reason] [oper-block: $oper_block]",
 		           log_data_string("reason", "Not matching oper::require-modes"),
 		           log_data_string("fail_type", "REQUIRE_MODES_NOT_SATISFIED"),
 		           log_data_string("oper_block", parv[1]));
 		add_fake_lag(client, 7000);
 		return;
 	}
 
 	if (!find_operclass(operblock->operclass))
 	{
 		sendnotice(client, "ERROR: There is a non-existant oper::operclass specified for your oper block");
 		unreal_log(ULOG_WARNING, "oper", "OPER_FAILED", client,
 		           "Failed OPER attempt by $client.details [reason: $reason] [oper-block: $oper_block]",
 		           log_data_string("reason", "Config error: invalid oper::operclass"),
 		           log_data_string("fail_type", "OPER_OPERCLASS_INVALID"),
 		           log_data_string("oper_block", parv[1]));
 		return;
 	}
 
 	if (operblock->maxlogins && (count_oper_sessions(operblock->name) >= operblock->maxlogins))
 	{
 		sendnumeric(client, ERR_NOOPERHOST);
 		sendnotice(client, "Your maximum number of concurrent oper logins has been reached (%d)",
 			operblock->maxlogins);
 		unreal_log(ULOG_WARNING, "oper", "OPER_FAILED", client,
 		           "Failed OPER attempt by $client.details [reason: $reason] [oper-block: $oper_block]",
 		           log_data_string("reason", "oper::maxlogins limit reached"),
 		           log_data_string("fail_type", "OPER_MAXLOGINS_LIMIT"),
 		           log_data_string("oper_block", parv[1]));
 		add_fake_lag(client, 4000);
 		return;
 	}
 
 	/* /OPER really succeeded now. Start processing it. */
 
 	/* Store which oper block was used to become IRCOp (for maxlogins and whois) */
 	safe_strdup(client->user->operlogin, operblock->name);
 
 	/* oper::swhois */
 	if (operblock->swhois)
 	{
 		SWhois *s;
 		for (s = operblock->swhois; s; s = s->next)
 			swhois_add(client, "oper", -100, s->line, &me, NULL);
 	}
 
 	make_oper(client, operblock->name, operblock->operclass, operblock->class, operblock->modes, operblock->snomask, operblock->vhost, operblock->auto_join);
 
 	/* set::plaintext-policy::oper 'warn' */
 	if (!IsSecure(client) && !IsLocalhost(client) && (iConf.plaintext_policy_oper == POLICY_WARN))
 	{
 		sendnotice_multiline(client, iConf.plaintext_policy_oper_message);
 		unreal_log(ULOG_WARNING, "oper", "OPER_UNSAFE", client,
 			   "Insecure (non-TLS) connection used to OPER up by $client.details [oper-block: $oper_block]",
 			   log_data_string("oper_block", parv[1]),
 		           log_data_string("warn_type", "NO_TLS"));
 	}
 
 	/* set::outdated-tls-policy::oper 'warn' */
 	if (IsSecure(client) && (iConf.outdated_tls_policy_oper == POLICY_WARN) && outdated_tls_client(client))
 	{
 		sendnotice(client, "%s", outdated_tls_client_build_string(iConf.outdated_tls_policy_oper_message, client));
 		unreal_log(ULOG_WARNING, "oper", "OPER_UNSAFE", client,
 			   "Outdated TLS protocol/cipher used to OPER up by $client.details [oper-block: $oper_block]",
 			   log_data_string("oper_block", parv[1]),
 		           log_data_string("warn_type", "OUTDATED_TLS_PROTOCOL_OR_CIPHER"));
 	}
 }
 
 int oper_connect(Client *client)
 {
 	ConfigItem_oper *e;
 
 	if (IsOper(client))
 		return 0;
 
 	for (e = conf_oper; e; e = e->next)
 	{
 		if (e->auto_login && user_allowed_by_security_group(client, e->match))
 		{
 			/* Ideally we would check all the criteria that cmd_oper does.
 			 * I'm taking a shortcut for now that is not ideal...
 			 */
 			const char *parx[3];
 			parx[0] = NULL;
 			parx[1] = e->name;
 			parx[2] = NULL;
 			do_cmd(client, NULL, "OPER", 3, parx);
 			return 0;
 		}
 	}
 
 	return 0;
 }

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