[irc/freenode/solanum.git] / modules / m_chghost.c

/*
 * Copyright (c) 2005 William Pitcock <nenolod -at- nenolod.net>
 * and Jilles Tjoelker <jilles -at- stack.nl>
 * All rights reserved.
 *
 * Redistribution in both source and binary forms are permitted
 * provided that the above copyright notice remains unchanged.
 *
 * m_chghost.c: A module for handling spoofing dynamically.
 */

#include "stdinc.h"
#include "send.h"
#include "channel.h"
#include "client.h"
#include "defaults.h"
#include "ircd.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "s_serv.h"
#include "s_user.h"
#include "hash.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "whowas.h"
#include "monitor.h"

static const char chghost_desc[] = "Provides commands used to change and retrieve client hostnames";

static void me_realhost(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void ms_chghost(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void me_chghost(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void mo_chghost(struct MsgBuf *, struct Client *, struct Client *, int, const char **);

struct Message realhost_msgtab = {
	"REALHOST", 0, 0, 0, 0,
	{mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_realhost, 2}, mg_ignore}
};

struct Message chghost_msgtab = {
	"CHGHOST", 0, 0, 0, 0,
	{mg_ignore, mg_not_oper, {ms_chghost, 3}, {ms_chghost, 3}, {me_chghost, 3}, {mo_chghost, 3}}
};

mapi_clist_av1 chghost_clist[] = { &chghost_msgtab, &realhost_msgtab, NULL };

DECLARE_MODULE_AV2(chghost, NULL, NULL, chghost_clist, NULL, NULL, NULL, NULL, chghost_desc);

/* clean_host()
 *
 * input	- host to check
 * output	- false if erroneous, else true
 * side effects -
 */
static bool
clean_host(const char *host)
{
	int len = 0;
	const char *last_slash = 0;

	if (*host == '\0' || *host == ':')
		return false;

	for(; *host; host++)
	{
		len++;

		if(!IsHostChar(*host))
			return false;
		if(*host == '/')
			last_slash = host;
	}

	if(len > HOSTLEN)
		return false;

	if(last_slash && IsDigit(last_slash[1]))
		return false;

	return true;
}

/*
 * me_realhost
 * parv[1] = real host
 *
 * Yes this contains a little race condition if someone does a whois
 * in between the UID and REALHOST and use_whois_actually is enabled.
 * I don't think that's a big problem as the whole thing is a
 * race condition.
 */
static void
me_realhost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
	int parc, const char *parv[])
{
	if (!IsPerson(source_p))
		return;

	del_from_hostname_hash(source_p->orighost, source_p);
	rb_strlcpy(source_p->orighost, parv[1], sizeof source_p->orighost);
	if (irccmp(source_p->host, source_p->orighost))
		SetDynSpoof(source_p);
	else
		ClearDynSpoof(source_p);
	add_to_hostname_hash(source_p->orighost, source_p);
}

static bool
do_chghost(struct Client *source_p, struct Client *target_p,
		const char *newhost, int is_encap)
{
	if (!clean_host(newhost))
	{
		sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s attempted to change hostname for %s to %s (invalid)",
				IsServer(source_p) ? source_p->name : get_oper_name(source_p),
				target_p->name, newhost);
		/* sending this remotely may disclose important
		 * routing information -- jilles */
		if (is_encap ? MyClient(target_p) : !ConfigServerHide.flatten_links)
			sendto_one_notice(target_p, ":*** Notice -- %s attempted to change your hostname to %s (invalid)",
					source_p->name, newhost);
		return false;
	}
	change_nick_user_host(target_p, target_p->name, target_p->username, newhost, 0, "Changing host");
	if (irccmp(target_p->host, target_p->orighost))
	{
		SetDynSpoof(target_p);
		if (MyClient(target_p))
			sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :is now your hidden host (set by %s)", target_p->host, source_p->name);
	}
	else
	{
		ClearDynSpoof(target_p);
		if (MyClient(target_p))
			sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :hostname reset by %s", target_p->host, source_p->name);
	}
	if (MyClient(source_p))
		sendto_one_notice(source_p, ":Changed hostname for %s to %s", target_p->name, target_p->host);
	if (!IsServer(source_p) && !IsService(source_p))
		sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s changed hostname for %s to %s", get_oper_name(source_p), target_p->name, target_p->host);
	return true;
}

/*
 * ms_chghost
 * parv[1] = target
 * parv[2] = host
 */
static void
ms_chghost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
	int parc, const char *parv[])
{
	struct Client *target_p;

	if (!(target_p = find_person(parv[1])))
		return;

	if (do_chghost(source_p, target_p, parv[2], 0))
	{
		sendto_server(client_p, NULL,
			CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
			use_id(source_p), use_id(target_p), parv[2]);
		sendto_server(client_p, NULL,
			CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
			use_id(source_p), use_id(target_p), parv[2]);
	}

	return;
}

/*
 * me_chghost
 * parv[1] = target
 * parv[2] = host
 */
static void
me_chghost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
	int parc, const char *parv[])
{
	struct Client *target_p;

	if (!(target_p = find_person(parv[1])))
		return;

	do_chghost(source_p, target_p, parv[2], 1);
}

/*
 * mo_chghost
 * parv[1] = target
 * parv[2] = host
 */
/* Disable this because of the abuse potential -- jilles
 * No, make it toggleable via ./configure. --nenolod
 */
static void
mo_chghost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
	int parc, const char *parv[])
{
#ifdef ENABLE_OPER_CHGHOST
	struct Client *target_p;

	if(!IsOperAdmin(source_p))
	{
		sendto_one(source_p, form_str(ERR_NOPRIVS),
			   me.name, source_p->name, "admin");
		return;
	}

	if (!(target_p = find_named_person(parv[1])))
	{
		sendto_one_numeric(source_p, ERR_NOSUCHNICK,
				form_str(ERR_NOSUCHNICK), parv[1]);
		return;
	}

	if (!clean_host(parv[2]))
	{
		sendto_one_notice(source_p, ":Hostname %s is invalid", parv[2]);
		return;
	}

	do_chghost(source_p, target_p, parv[2], 0);

	sendto_server(NULL, NULL,
		CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
		use_id(source_p), use_id(target_p), parv[2]);
	sendto_server(NULL, NULL,
		CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
		use_id(source_p), use_id(target_p), parv[2]);
#else
	sendto_one_numeric(source_p, ERR_DISABLED, form_str(ERR_DISABLED),
			"CHGHOST");
#endif
}
Commit	Line	Data
212380e3 WP	1	/*
	2	* Copyright (c) 2005 William Pitcock <nenolod -at- nenolod.net>
	3	* and Jilles Tjoelker <jilles -at- stack.nl>
	4	* All rights reserved.
	5	*
	6	* Redistribution in both source and binary forms are permitted
	7	* provided that the above copyright notice remains unchanged.
	8	*
	9	* m_chghost.c: A module for handling spoofing dynamically.
	10	*/
	11
	12	#include "stdinc.h"
212380e3 WP	13	#include "send.h"
	14	#include "channel.h"
	15	#include "client.h"
9b8e9eb3	16	#include "defaults.h"
212380e3 WP	17	#include "ircd.h"
212380e3 WP	18	#include "numeric.h"
212380e3 WP	19	#include "s_conf.h"
	20	#include "s_newconf.h"
	21	#include "s_serv.h"
	22	#include "s_user.h"
	23	#include "hash.h"
	24	#include "msg.h"
	25	#include "parse.h"
	26	#include "modules.h"
212380e3 WP	27	#include "whowas.h"
	28	#include "monitor.h"
	29
eeabf33a EM	30	static const char chghost_desc[] = "Provides commands used to change and retrieve client hostnames";
eeabf33a EM	31
3c7d6fcc EM	32	static void me_realhost(struct MsgBuf , struct Client , struct Client , int, const char *);
	33	static void ms_chghost(struct MsgBuf , struct Client , struct Client , int, const char *);
	34	static void me_chghost(struct MsgBuf , struct Client , struct Client , int, const char *);
	35	static void mo_chghost(struct MsgBuf , struct Client , struct Client , int, const char *);
212380e3 WP	36
212380e3 WP	37	struct Message realhost_msgtab = {
7baa37a9	38	"REALHOST", 0, 0, 0, 0,
212380e3 WP	39	{mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_realhost, 2}, mg_ignore}
	40	};
	41
	42	struct Message chghost_msgtab = {
7baa37a9	43	"CHGHOST", 0, 0, 0, 0,
212380e3 WP	44	{mg_ignore, mg_not_oper, {ms_chghost, 3}, {ms_chghost, 3}, {me_chghost, 3}, {mo_chghost, 3}}
	45	};
	46
	47	mapi_clist_av1 chghost_clist[] = { &chghost_msgtab, &realhost_msgtab, NULL };
	48
5544da98	49	DECLARE_MODULE_AV2(chghost, NULL, NULL, chghost_clist, NULL, NULL, NULL, NULL, chghost_desc);
212380e3 WP	50
	51	/* clean_host()
	52	*
	53	* input - host to check
b8b72cbd	54	* output - false if erroneous, else true
212380e3 WP	55	* side effects -
212380e3 WP	56	*/
b8b72cbd	57	static bool
212380e3 WP	58	clean_host(const char *host)
	59	{
	60	int len = 0;
9a180ae3	61	const char *last_slash = 0;
55abcbb2	62
822a4a25	63	if (host == '\0' \|\| host == ':')
b8b72cbd	64	return false;
212380e3 WP	65
	66	for(; *host; host++)
	67	{
	68	len++;
	69
	70	if(!IsHostChar(*host))
b8b72cbd	71	return false;
9a180ae3 SB	72	if(*host == '/')
9a180ae3 SB	73	last_slash = host;
212380e3 WP	74	}
	75
	76	if(len > HOSTLEN)
b8b72cbd	77	return false;
212380e3	78
9a180ae3	79	if(last_slash && IsDigit(last_slash[1]))
b8b72cbd	80	return false;
9a180ae3	81
b8b72cbd	82	return true;
212380e3 WP	83	}
	84
	85	/*
	86	* me_realhost
212380e3 WP	87	* parv[1] = real host
	88	*
	89	* Yes this contains a little race condition if someone does a whois
	90	* in between the UID and REALHOST and use_whois_actually is enabled.
	91	* I don't think that's a big problem as the whole thing is a
	92	* race condition.
	93	*/
3c7d6fcc	94	static void
428ca87b	95	me_realhost(struct MsgBuf msgbuf_p, struct Client client_p, struct Client *source_p,
212380e3 WP	96	int parc, const char *parv[])
	97	{
	98	if (!IsPerson(source_p))
3c7d6fcc	99	return;
212380e3 WP	100
212380e3 WP	101	del_from_hostname_hash(source_p->orighost, source_p);
f427c8b0	102	rb_strlcpy(source_p->orighost, parv[1], sizeof source_p->orighost);
212380e3 WP	103	if (irccmp(source_p->host, source_p->orighost))
	104	SetDynSpoof(source_p);
	105	else
	106	ClearDynSpoof(source_p);
	107	add_to_hostname_hash(source_p->orighost, source_p);
212380e3 WP	108	}
212380e3 WP	109
b8b72cbd	110	static bool
212380e3 WP	111	do_chghost(struct Client source_p, struct Client target_p,
	112	const char *newhost, int is_encap)
	113	{
	114	if (!clean_host(newhost))
	115	{
a9227555	116	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s attempted to change hostname for %s to %s (invalid)",
212380e3 WP	117	IsServer(source_p) ? source_p->name : get_oper_name(source_p),
	118	target_p->name, newhost);
	119	/* sending this remotely may disclose important
	120	* routing information -- jilles */
	121	if (is_encap ? MyClient(target_p) : !ConfigServerHide.flatten_links)
	122	sendto_one_notice(target_p, ":*** Notice -- %s attempted to change your hostname to %s (invalid)",
	123	source_p->name, newhost);
b8b72cbd	124	return false;
212380e3 WP	125	}
	126	change_nick_user_host(target_p, target_p->name, target_p->username, newhost, 0, "Changing host");
	127	if (irccmp(target_p->host, target_p->orighost))
	128	{
	129	SetDynSpoof(target_p);
	130	if (MyClient(target_p))
	131	sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :is now your hidden host (set by %s)", target_p->host, source_p->name);
	132	}
	133	else
	134	{
	135	ClearDynSpoof(target_p);
	136	if (MyClient(target_p))
	137	sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :hostname reset by %s", target_p->host, source_p->name);
	138	}
	139	if (MyClient(source_p))
	140	sendto_one_notice(source_p, ":Changed hostname for %s to %s", target_p->name, target_p->host);
	141	if (!IsServer(source_p) && !IsService(source_p))
	142	sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s changed hostname for %s to %s", get_oper_name(source_p), target_p->name, target_p->host);
b8b72cbd	143	return true;
212380e3 WP	144	}
	145
	146	/*
	147	* ms_chghost
212380e3 WP	148	* parv[1] = target
	149	* parv[2] = host
	150	*/
3c7d6fcc	151	static void
428ca87b	152	ms_chghost(struct MsgBuf msgbuf_p, struct Client client_p, struct Client *source_p,
212380e3 WP	153	int parc, const char *parv[])
	154	{
	155	struct Client *target_p;
	156
	157	if (!(target_p = find_person(parv[1])))
3c7d6fcc	158	return;
212380e3 WP	159
	160	if (do_chghost(source_p, target_p, parv[2], 0))
	161	{
	162	sendto_server(client_p, NULL,
	163	CAP_EUID \| CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
	164	use_id(source_p), use_id(target_p), parv[2]);
	165	sendto_server(client_p, NULL,
	166	CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
	167	use_id(source_p), use_id(target_p), parv[2]);
212380e3 WP	168	}
212380e3 WP	169
3c7d6fcc	170	return;
212380e3 WP	171	}
	172
	173	/*
	174	* me_chghost
212380e3 WP	175	* parv[1] = target
	176	* parv[2] = host
	177	*/
3c7d6fcc	178	static void
428ca87b	179	me_chghost(struct MsgBuf msgbuf_p, struct Client client_p, struct Client *source_p,
212380e3 WP	180	int parc, const char *parv[])
	181	{
	182	struct Client *target_p;
	183
	184	if (!(target_p = find_person(parv[1])))
3c7d6fcc	185	return;
212380e3 WP	186
212380e3 WP	187	do_chghost(source_p, target_p, parv[2], 1);
212380e3 WP	188	}
	189
	190	/*
	191	* mo_chghost
212380e3 WP	192	* parv[1] = target
	193	* parv[2] = host
	194	*/
	195	/* Disable this because of the abuse potential -- jilles
	196	* No, make it toggleable via ./configure. --nenolod
	197	*/
3c7d6fcc	198	static void
428ca87b	199	mo_chghost(struct MsgBuf msgbuf_p, struct Client client_p, struct Client *source_p,
212380e3 WP	200	int parc, const char *parv[])
	201	{
	202	#ifdef ENABLE_OPER_CHGHOST
	203	struct Client *target_p;
	204
	205	if(!IsOperAdmin(source_p))
	206	{
	207	sendto_one(source_p, form_str(ERR_NOPRIVS),
	208	me.name, source_p->name, "admin");
3c7d6fcc	209	return;
212380e3 WP	210	}
	211
	212	if (!(target_p = find_named_person(parv[1])))
	213	{
	214	sendto_one_numeric(source_p, ERR_NOSUCHNICK,
	215	form_str(ERR_NOSUCHNICK), parv[1]);
3c7d6fcc	216	return;
212380e3 WP	217	}
	218
	219	if (!clean_host(parv[2]))
	220	{
	221	sendto_one_notice(source_p, ":Hostname %s is invalid", parv[2]);
3c7d6fcc	222	return;
212380e3 WP	223	}
	224
	225	do_chghost(source_p, target_p, parv[2], 0);
	226
	227	sendto_server(NULL, NULL,
	228	CAP_EUID \| CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
	229	use_id(source_p), use_id(target_p), parv[2]);
	230	sendto_server(NULL, NULL,
	231	CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
	232	use_id(source_p), use_id(target_p), parv[2]);
212380e3	233	#else
22f2f68a JT	234	sendto_one_numeric(source_p, ERR_DISABLED, form_str(ERR_DISABLED),
22f2f68a JT	235	"CHGHOST");
212380e3	236	#endif
212380e3 WP	237	}
212380e3 WP	238