238 lines
6.2 KiB
C
238 lines
6.2 KiB
C
/*
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* Copyright (c) 2005 William Pitcock <nenolod -at- nenolod.net>
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* and Jilles Tjoelker <jilles -at- stack.nl>
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* All rights reserved.
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*
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* Redistribution in both source and binary forms are permitted
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* provided that the above copyright notice remains unchanged.
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*
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* m_chghost.c: A module for handling spoofing dynamically.
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*/
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#include "stdinc.h"
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#include "send.h"
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#include "channel.h"
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#include "client.h"
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#include "defaults.h"
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#include "ircd.h"
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#include "numeric.h"
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#include "s_conf.h"
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#include "s_newconf.h"
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#include "s_serv.h"
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#include "s_user.h"
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#include "hash.h"
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#include "msg.h"
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#include "parse.h"
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#include "modules.h"
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#include "whowas.h"
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#include "monitor.h"
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static const char chghost_desc[] = "Provides commands used to change and retrieve client hostnames";
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static void me_realhost(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void ms_chghost(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void me_chghost(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void mo_chghost(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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struct Message realhost_msgtab = {
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"REALHOST", 0, 0, 0, 0,
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{mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_realhost, 2}, mg_ignore}
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};
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struct Message chghost_msgtab = {
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"CHGHOST", 0, 0, 0, 0,
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{mg_ignore, mg_not_oper, {ms_chghost, 3}, {ms_chghost, 3}, {me_chghost, 3}, {mo_chghost, 3}}
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};
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mapi_clist_av1 chghost_clist[] = { &chghost_msgtab, &realhost_msgtab, NULL };
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DECLARE_MODULE_AV2(chghost, NULL, NULL, chghost_clist, NULL, NULL, NULL, NULL, chghost_desc);
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/* clean_host()
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*
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* input - host to check
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* output - false if erroneous, else true
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* side effects -
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*/
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static bool
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clean_host(const char *host)
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{
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int len = 0;
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const char *last_slash = 0;
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if (*host == '\0' || *host == ':')
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return false;
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for(; *host; host++)
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{
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len++;
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if(!IsHostChar(*host))
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return false;
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if(*host == '/')
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last_slash = host;
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}
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if(len > HOSTLEN)
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return false;
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if(last_slash && IsDigit(last_slash[1]))
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return false;
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return true;
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}
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/*
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* me_realhost
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* parv[1] = real host
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*
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* Yes this contains a little race condition if someone does a whois
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* in between the UID and REALHOST and use_whois_actually is enabled.
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* I don't think that's a big problem as the whole thing is a
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* race condition.
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*/
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static void
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me_realhost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
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int parc, const char *parv[])
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{
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if (!IsPerson(source_p))
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return;
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del_from_hostname_hash(source_p->orighost, source_p);
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rb_strlcpy(source_p->orighost, parv[1], sizeof source_p->orighost);
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if (irccmp(source_p->host, source_p->orighost))
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SetDynSpoof(source_p);
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else
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ClearDynSpoof(source_p);
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add_to_hostname_hash(source_p->orighost, source_p);
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}
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static bool
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do_chghost(struct Client *source_p, struct Client *target_p,
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const char *newhost, int is_encap)
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{
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if (!clean_host(newhost))
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{
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s attempted to change hostname for %s to %s (invalid)",
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IsServer(source_p) ? source_p->name : get_oper_name(source_p),
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target_p->name, newhost);
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/* sending this remotely may disclose important
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* routing information -- jilles */
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if (is_encap ? MyClient(target_p) : !ConfigServerHide.flatten_links)
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sendto_one_notice(target_p, ":*** Notice -- %s attempted to change your hostname to %s (invalid)",
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source_p->name, newhost);
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return false;
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}
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change_nick_user_host(target_p, target_p->name, target_p->username, newhost, 0, "Changing host");
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if (irccmp(target_p->host, target_p->orighost))
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{
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SetDynSpoof(target_p);
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if (MyClient(target_p))
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sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :is now your hidden host (set by %s)", target_p->host, source_p->name);
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}
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else
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{
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ClearDynSpoof(target_p);
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if (MyClient(target_p))
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sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :hostname reset by %s", target_p->host, source_p->name);
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}
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if (MyClient(source_p))
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sendto_one_notice(source_p, ":Changed hostname for %s to %s", target_p->name, target_p->host);
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if (!IsServer(source_p) && !IsService(source_p))
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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);
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return true;
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}
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/*
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* ms_chghost
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* parv[1] = target
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* parv[2] = host
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*/
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static void
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ms_chghost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
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int parc, const char *parv[])
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{
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struct Client *target_p;
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if (!(target_p = find_person(parv[1])))
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return;
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if (do_chghost(source_p, target_p, parv[2], 0))
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{
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sendto_server(client_p, NULL,
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CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
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use_id(source_p), use_id(target_p), parv[2]);
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sendto_server(client_p, NULL,
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CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
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use_id(source_p), use_id(target_p), parv[2]);
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}
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return;
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}
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/*
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* me_chghost
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* parv[1] = target
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* parv[2] = host
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*/
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static void
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me_chghost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
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int parc, const char *parv[])
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{
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struct Client *target_p;
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if (!(target_p = find_person(parv[1])))
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return;
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do_chghost(source_p, target_p, parv[2], 1);
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}
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/*
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* mo_chghost
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* parv[1] = target
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* parv[2] = host
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*/
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/* Disable this because of the abuse potential -- jilles
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* No, make it toggleable via ./configure. --nenolod
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*/
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static void
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mo_chghost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
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int parc, const char *parv[])
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{
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#ifdef ENABLE_OPER_CHGHOST
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struct Client *target_p;
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if(!IsOperAdmin(source_p))
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{
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sendto_one(source_p, form_str(ERR_NOPRIVS),
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me.name, source_p->name, "admin");
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return;
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}
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if (!(target_p = find_named_person(parv[1])))
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{
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sendto_one_numeric(source_p, ERR_NOSUCHNICK,
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form_str(ERR_NOSUCHNICK), parv[1]);
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return;
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}
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if (!clean_host(parv[2]))
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{
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sendto_one_notice(source_p, ":Hostname %s is invalid", parv[2]);
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return;
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}
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do_chghost(source_p, target_p, parv[2], 0);
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sendto_server(NULL, NULL,
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CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
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use_id(source_p), use_id(target_p), parv[2]);
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sendto_server(NULL, NULL,
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CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
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use_id(source_p), use_id(target_p), parv[2]);
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#else
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sendto_one_numeric(source_p, ERR_DISABLED, form_str(ERR_DISABLED),
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"CHGHOST");
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#endif
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}
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