[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 "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 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	- 0 if erroneous, else 1
 * 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 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);
	return;
}

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 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);

	return;
}

/*
 * 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

	return;
}
Commit	Line	Data
212380e3 AC	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 AC	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 AC	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 AC	28	#include "whowas.h"
	29	#include "monitor.h"
	30
eeabf33a EM	31	static const char chghost_desc[] = "Provides commands used to change and retrieve client hostnames";
eeabf33a EM	32
3c7d6fcc EM	33	static void me_realhost(struct MsgBuf , struct Client , struct Client , int, const char *);
	34	static void ms_chghost(struct MsgBuf , struct Client , struct Client , int, const char *);
	35	static void me_chghost(struct MsgBuf , struct Client , struct Client , int, const char *);
	36	static void mo_chghost(struct MsgBuf , struct Client , struct Client , int, const char *);
212380e3 AC	37
212380e3 AC	38	struct Message realhost_msgtab = {
7baa37a9	39	"REALHOST", 0, 0, 0, 0,
212380e3 AC	40	{mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_realhost, 2}, mg_ignore}
	41	};
	42
	43	struct Message chghost_msgtab = {
7baa37a9	44	"CHGHOST", 0, 0, 0, 0,
212380e3 AC	45	{mg_ignore, mg_not_oper, {ms_chghost, 3}, {ms_chghost, 3}, {me_chghost, 3}, {mo_chghost, 3}}
	46	};
	47
	48	mapi_clist_av1 chghost_clist[] = { &chghost_msgtab, &realhost_msgtab, NULL };
	49
5544da98	50	DECLARE_MODULE_AV2(chghost, NULL, NULL, chghost_clist, NULL, NULL, NULL, NULL, chghost_desc);
212380e3 AC	51
	52	/* clean_host()
	53	*
	54	* input - host to check
5499771f	55	* output - 0 if erroneous, else 1
212380e3 AC	56	* side effects -
	57	*/
	58	static int
	59	clean_host(const char *host)
	60	{
	61	int len = 0;
9a180ae3	62	const char *last_slash = 0;
55abcbb2	63
822a4a25 JT	64	if (host == '\0' \|\| host == ':')
822a4a25 JT	65	return 0;
212380e3 AC	66
	67	for(; *host; host++)
	68	{
	69	len++;
	70
	71	if(!IsHostChar(*host))
	72	return 0;
9a180ae3 SB	73	if(*host == '/')
9a180ae3 SB	74	last_slash = host;
212380e3 AC	75	}
	76
	77	if(len > HOSTLEN)
	78	return 0;
	79
9a180ae3 SB	80	if(last_slash && IsDigit(last_slash[1]))
	81	return 0;
	82
212380e3 AC	83	return 1;
	84	}
	85
	86	/*
	87	* me_realhost
212380e3 AC	88	* parv[1] = real host
	89	*
	90	* Yes this contains a little race condition if someone does a whois
	91	* in between the UID and REALHOST and use_whois_actually is enabled.
	92	* I don't think that's a big problem as the whole thing is a
	93	* race condition.
	94	*/
3c7d6fcc	95	static void
428ca87b	96	me_realhost(struct MsgBuf msgbuf_p, struct Client client_p, struct Client *source_p,
212380e3 AC	97	int parc, const char *parv[])
	98	{
	99	if (!IsPerson(source_p))
3c7d6fcc	100	return;
212380e3 AC	101
212380e3 AC	102	del_from_hostname_hash(source_p->orighost, source_p);
f427c8b0	103	rb_strlcpy(source_p->orighost, parv[1], sizeof source_p->orighost);
212380e3 AC	104	if (irccmp(source_p->host, source_p->orighost))
	105	SetDynSpoof(source_p);
	106	else
	107	ClearDynSpoof(source_p);
	108	add_to_hostname_hash(source_p->orighost, source_p);
3c7d6fcc	109	return;
212380e3 AC	110	}
	111
	112	static int
	113	do_chghost(struct Client source_p, struct Client target_p,
	114	const char *newhost, int is_encap)
	115	{
	116	if (!clean_host(newhost))
	117	{
	118	sendto_realops_snomask(SNO_GENERAL, is_encap ? L_ALL : L_NETWIDE, "%s attempted to change hostname for %s to %s (invalid)",
	119	IsServer(source_p) ? source_p->name : get_oper_name(source_p),
	120	target_p->name, newhost);
	121	/* sending this remotely may disclose important
	122	* routing information -- jilles */
	123	if (is_encap ? MyClient(target_p) : !ConfigServerHide.flatten_links)
	124	sendto_one_notice(target_p, ":*** Notice -- %s attempted to change your hostname to %s (invalid)",
	125	source_p->name, newhost);
	126	return 0;
	127	}
	128	change_nick_user_host(target_p, target_p->name, target_p->username, newhost, 0, "Changing host");
	129	if (irccmp(target_p->host, target_p->orighost))
	130	{
	131	SetDynSpoof(target_p);
	132	if (MyClient(target_p))
	133	sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :is now your hidden host (set by %s)", target_p->host, source_p->name);
	134	}
	135	else
	136	{
	137	ClearDynSpoof(target_p);
	138	if (MyClient(target_p))
	139	sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :hostname reset by %s", target_p->host, source_p->name);
	140	}
	141	if (MyClient(source_p))
	142	sendto_one_notice(source_p, ":Changed hostname for %s to %s", target_p->name, target_p->host);
	143	if (!IsServer(source_p) && !IsService(source_p))
	144	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);
	145	return 1;
	146	}
	147
	148	/*
	149	* ms_chghost
212380e3 AC	150	* parv[1] = target
	151	* parv[2] = host
	152	*/
3c7d6fcc	153	static void
428ca87b	154	ms_chghost(struct MsgBuf msgbuf_p, struct Client client_p, struct Client *source_p,
212380e3 AC	155	int parc, const char *parv[])
	156	{
	157	struct Client *target_p;
	158
	159	if (!(target_p = find_person(parv[1])))
3c7d6fcc	160	return;
212380e3 AC	161
	162	if (do_chghost(source_p, target_p, parv[2], 0))
	163	{
	164	sendto_server(client_p, NULL,
	165	CAP_EUID \| CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
	166	use_id(source_p), use_id(target_p), parv[2]);
	167	sendto_server(client_p, NULL,
	168	CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
	169	use_id(source_p), use_id(target_p), parv[2]);
212380e3 AC	170	}
212380e3 AC	171
3c7d6fcc	172	return;
212380e3 AC	173	}
	174
	175	/*
	176	* me_chghost
212380e3 AC	177	* parv[1] = target
	178	* parv[2] = host
	179	*/
3c7d6fcc	180	static void
428ca87b	181	me_chghost(struct MsgBuf msgbuf_p, struct Client client_p, struct Client *source_p,
212380e3 AC	182	int parc, const char *parv[])
	183	{
	184	struct Client *target_p;
	185
	186	if (!(target_p = find_person(parv[1])))
3c7d6fcc	187	return;
212380e3 AC	188
	189	do_chghost(source_p, target_p, parv[2], 1);
	190
3c7d6fcc	191	return;
212380e3 AC	192	}
	193
	194	/*
	195	* mo_chghost
212380e3 AC	196	* parv[1] = target
	197	* parv[2] = host
	198	*/
	199	/* Disable this because of the abuse potential -- jilles
	200	* No, make it toggleable via ./configure. --nenolod
	201	*/
3c7d6fcc	202	static void
428ca87b	203	mo_chghost(struct MsgBuf msgbuf_p, struct Client client_p, struct Client *source_p,
212380e3 AC	204	int parc, const char *parv[])
	205	{
	206	#ifdef ENABLE_OPER_CHGHOST
	207	struct Client *target_p;
	208
	209	if(!IsOperAdmin(source_p))
	210	{
	211	sendto_one(source_p, form_str(ERR_NOPRIVS),
	212	me.name, source_p->name, "admin");
3c7d6fcc	213	return;
212380e3 AC	214	}
	215
	216	if (!(target_p = find_named_person(parv[1])))
	217	{
	218	sendto_one_numeric(source_p, ERR_NOSUCHNICK,
	219	form_str(ERR_NOSUCHNICK), parv[1]);
3c7d6fcc	220	return;
212380e3 AC	221	}
	222
	223	if (!clean_host(parv[2]))
	224	{
	225	sendto_one_notice(source_p, ":Hostname %s is invalid", parv[2]);
3c7d6fcc	226	return;
212380e3 AC	227	}
	228
	229	do_chghost(source_p, target_p, parv[2], 0);
	230
	231	sendto_server(NULL, NULL,
	232	CAP_EUID \| CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
	233	use_id(source_p), use_id(target_p), parv[2]);
	234	sendto_server(NULL, NULL,
	235	CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
	236	use_id(source_p), use_id(target_p), parv[2]);
212380e3	237	#else
22f2f68a JT	238	sendto_one_numeric(source_p, ERR_DISABLED, form_str(ERR_DISABLED),
22f2f68a JT	239	"CHGHOST");
212380e3 AC	240	#endif
212380e3 AC	241
3c7d6fcc	242	return;
212380e3 AC	243	}
212380e3 AC	244