[irc/rqf/shadowircd.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 "common.h"
#include "config.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 int me_realhost(struct Client *, struct Client *, int, const char **);
static int ms_chghost(struct Client *, struct Client *, int, const char **);
static int me_chghost(struct Client *, struct Client *, int, const char **);
static int mo_chghost(struct Client *, struct Client *, int, const char **);

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

struct Message chghost_msgtab = {
	"CHGHOST", 0, 0, 0, MFLG_SLOW,
	{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_AV1(chghost, NULL, NULL, chghost_clist, NULL, NULL, "$Revision: 3424 $");

/* clean_host()
 *
 * input	- host to check
 * output	- 0 if erroneous, else 0
 * side effects -
 */
static int
clean_host(const char *host)
{
	int len = 0;
	const char *last_slash = 0;
	
	if (*host == '\0' || *host == ':')
		return 0;

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

		if(!IsHostChar(*host))
			return 0;
		if(*host == '/')
			last_slash = host;
	}

	if(len > HOSTLEN)
		return 0;

	if(last_slash && IsDigit(last_slash[1]))
		return 0;

	return 1;
}

/*
 * 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 int
me_realhost(struct Client *client_p, struct Client *source_p,
	int parc, const char *parv[])
{
	if (!IsPerson(source_p))
		return 0;

	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);
	return 0;
}

static int
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, is_encap ? L_ALL : 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 0;
	}
	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 1;
}

/*
 * ms_chghost
 * parv[1] = target
 * parv[2] = host
 */
static int
ms_chghost(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 -1;

	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 0;
}

/*
 * me_chghost
 * parv[1] = target
 * parv[2] = host
 */
static int
me_chghost(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 -1;

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

	return 0;
}

/*
 * mo_chghost
 * parv[1] = target
 * parv[2] = host
 */
/* Disable this because of the abuse potential -- jilles
 * No, make it toggleable via ./configure. --nenolod
 */
static int
mo_chghost(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 0;
	}

	if (!(target_p = find_named_person(parv[1])))
	{
		sendto_one_numeric(source_p, ERR_NOSUCHNICK,
				form_str(ERR_NOSUCHNICK), parv[1]);
		return 0;
	}

	if (!clean_host(parv[2]))
	{
		sendto_one_notice(source_p, ":Hostname %s is invalid", parv[2]);
		return 0;
	}

	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

	return 0;
}
Commit	Line	Data
212380e3	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	13	#include "send.h"
	14	#include "channel.h"
	15	#include "client.h"
	16	#include "common.h"
	17	#include "config.h"
	18	#include "ircd.h"
	19	#include "numeric.h"
212380e3	20	#include "s_conf.h"
	21	#include "s_newconf.h"
	22	#include "s_serv.h"
	23	#include "s_user.h"
	24	#include "hash.h"
	25	#include "msg.h"
	26	#include "parse.h"
	27	#include "modules.h"
212380e3	28	#include "whowas.h"
	29	#include "monitor.h"
	30
	31	static int me_realhost(struct Client , struct Client , int, const char **);
	32	static int ms_chghost(struct Client , struct Client , int, const char **);
	33	static int me_chghost(struct Client , struct Client , int, const char **);
	34	static int mo_chghost(struct Client , struct Client , int, const char **);
	35
	36	struct Message realhost_msgtab = {
	37	"REALHOST", 0, 0, 0, MFLG_SLOW,
	38	{mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_realhost, 2}, mg_ignore}
	39	};
	40
	41	struct Message chghost_msgtab = {
	42	"CHGHOST", 0, 0, 0, MFLG_SLOW,
	43	{mg_ignore, mg_not_oper, {ms_chghost, 3}, {ms_chghost, 3}, {me_chghost, 3}, {mo_chghost, 3}}
	44	};
	45
	46	mapi_clist_av1 chghost_clist[] = { &chghost_msgtab, &realhost_msgtab, NULL };
	47
822a4a25	48	DECLARE_MODULE_AV1(chghost, NULL, NULL, chghost_clist, NULL, NULL, "$Revision: 3424 $");
212380e3	49
	50	/* clean_host()
	51	*
	52	* input - host to check
	53	* output - 0 if erroneous, else 0
	54	* side effects -
	55	*/
	56	static int
	57	clean_host(const char *host)
	58	{
	59	int len = 0;
59bb8093	60	const char *last_slash = 0;
822a4a25	61
	62	if (host == '\0' \|\| host == ':')
	63	return 0;
212380e3	64
	65	for(; *host; host++)
	66	{
	67	len++;
	68
	69	if(!IsHostChar(*host))
	70	return 0;
59bb8093 SB	71	if(*host == '/')
59bb8093 SB	72	last_slash = host;
212380e3	73	}
	74
	75	if(len > HOSTLEN)
	76	return 0;
	77
59bb8093 SB	78	if(last_slash && IsDigit(last_slash[1]))
	79	return 0;
	80
212380e3	81	return 1;
	82	}
	83
	84	/*
	85	* me_realhost
212380e3	86	* parv[1] = real host
	87	*
	88	* Yes this contains a little race condition if someone does a whois
	89	* in between the UID and REALHOST and use_whois_actually is enabled.
	90	* I don't think that's a big problem as the whole thing is a
	91	* race condition.
	92	*/
	93	static int
	94	me_realhost(struct Client client_p, struct Client source_p,
	95	int parc, const char *parv[])
	96	{
	97	if (!IsPerson(source_p))
	98	return 0;
	99
	100	del_from_hostname_hash(source_p->orighost, source_p);
907468c4	101	rb_strlcpy(source_p->orighost, parv[1], sizeof source_p->orighost);
212380e3	102	if (irccmp(source_p->host, source_p->orighost))
	103	SetDynSpoof(source_p);
	104	else
	105	ClearDynSpoof(source_p);
	106	add_to_hostname_hash(source_p->orighost, source_p);
	107	return 0;
	108	}
	109
	110	static int
	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	{
	116	sendto_realops_snomask(SNO_GENERAL, is_encap ? L_ALL : L_NETWIDE, "%s attempted to change hostname for %s to %s (invalid)",
	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);
	124	return 0;
	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);
	143	return 1;
	144	}
	145
	146	/*
	147	* ms_chghost
212380e3	148	* parv[1] = target
	149	* parv[2] = host
	150	*/
	151	static int
	152	ms_chghost(struct Client client_p, struct Client source_p,
	153	int parc, const char *parv[])
	154	{
	155	struct Client *target_p;
	156
	157	if (!(target_p = find_person(parv[1])))
	158	return -1;
	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	168	}
	169
	170	return 0;
	171	}
	172
	173	/*
	174	* me_chghost
212380e3	175	* parv[1] = target
	176	* parv[2] = host
	177	*/
	178	static int
	179	me_chghost(struct Client client_p, struct Client source_p,
	180	int parc, const char *parv[])
	181	{
	182	struct Client *target_p;
	183
	184	if (!(target_p = find_person(parv[1])))
	185	return -1;
	186
	187	do_chghost(source_p, target_p, parv[2], 1);
	188
	189	return 0;
	190	}
	191
	192	/*
	193	* mo_chghost
212380e3	194	* parv[1] = target
	195	* parv[2] = host
	196	*/
	197	/* Disable this because of the abuse potential -- jilles
	198	* No, make it toggleable via ./configure. --nenolod
	199	*/
	200	static int
	201	mo_chghost(struct Client client_p, struct Client source_p,
	202	int parc, const char *parv[])
	203	{
	204	#ifdef ENABLE_OPER_CHGHOST
	205	struct Client *target_p;
	206
	207	if(!IsOperAdmin(source_p))
	208	{
	209	sendto_one(source_p, form_str(ERR_NOPRIVS),
	210	me.name, source_p->name, "admin");
	211	return 0;
	212	}
	213
	214	if (!(target_p = find_named_person(parv[1])))
	215	{
	216	sendto_one_numeric(source_p, ERR_NOSUCHNICK,
	217	form_str(ERR_NOSUCHNICK), parv[1]);
	218	return 0;
	219	}
	220
	221	if (!clean_host(parv[2]))
	222	{
	223	sendto_one_notice(source_p, ":Hostname %s is invalid", parv[2]);
	224	return 0;
	225	}
	226
	227	do_chghost(source_p, target_p, parv[2], 0);
	228
	229	sendto_server(NULL, NULL,
	230	CAP_EUID \| CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
	231	use_id(source_p), use_id(target_p), parv[2]);
	232	sendto_server(NULL, NULL,
	233	CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
	234	use_id(source_p), use_id(target_p), parv[2]);
212380e3	235	#else
889b0321 JT	236	sendto_one_numeric(source_p, ERR_DISABLED, form_str(ERR_DISABLED),
889b0321 JT	237	"CHGHOST");
212380e3	238	#endif
	239
	240	return 0;
	241	}
	242