-#include <stdio.h>
+/* +------------------------------------+
+ * | Inspire Internet Relay Chat Daemon |
+ * +------------------------------------+
+ *
+ * InspIRCd: (C) 2002-2007 InspIRCd Development Team
+ * See: http://www.inspircd.org/wiki/index.php/Credits
+ *
+ * This program is free but copyrighted software; see
+ * the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+#include "inspircd_config.h"
+#include "configreader.h"
+#include "inspircd.h"
#include "users.h"
#include "channels.h"
#include "modules.h"
+#include "m_hash.h"
+
/* $ModDesc: Provides masking of user hostnames */
+/* $ModDep: m_hash.h */
+
+/* Used to vary the output a little more depending on the cloak keys */
+static const char* xtab[] = {"F92E45D871BCA630", "A1B9D80C72E653F4", "1ABC078934DEF562", "ABCDEF5678901234"};
+
+/** Handles user mode +x
+ */
+class CloakUser : public ModeHandler
+{
+
+ std::string prefix;
+ unsigned int key1;
+ unsigned int key2;
+ unsigned int key3;
+ unsigned int key4;
+ Module* Sender;
+ Module* HashProvider;
+
+ /** This function takes a domain name string and returns just the last two domain parts,
+ * or the last domain part if only two are available. Failing that it just returns what it was given.
+ *
+ * For example, if it is passed "svn.inspircd.org" it will return ".inspircd.org".
+ * If it is passed "brainbox.winbot.co.uk" it will return ".co.uk",
+ * and if it is passed "localhost.localdomain" it will return ".localdomain".
+ *
+ * This is used to ensure a significant part of the host is always cloaked (see Bug #216)
+ */
+ std::string LastTwoDomainParts(const std::string &host)
+ {
+ int dots = 0;
+ std::string::size_type splitdot = host.length();
+
+ for (std::string::size_type x = host.length() - 1; x; --x)
+ {
+ if (host[x] == '.')
+ {
+ splitdot = x;
+ dots++;
+ }
+ if (dots >= 3)
+ break;
+ }
+
+ if (splitdot == host.length())
+ return host;
+ else
+ return host.substr(splitdot);
+ }
+
+ public:
+ CloakUser(InspIRCd* Instance, Module* Source, Module* Hash) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false), Sender(Source), HashProvider(Hash)
+ {
+ }
+
+ ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string ¶meter, bool adding)
+ {
+ /* Only opers can change other users modes */
+ if ((source != dest) && (!*source->oper))
+ return MODEACTION_DENY;
+
+ /* For remote clients, we dont take any action, we just allow it.
+ * The local server where they are will set their cloak instead.
+ */
+ if (!IS_LOCAL(dest))
+ return MODEACTION_ALLOW;
+
+ if (adding)
+ {
+ if(!dest->IsModeSet('x'))
+ {
+ /* The mode is being turned on - so attempt to
+ * allocate the user a cloaked host using a non-reversible
+ * algorithm (its simple, but its non-reversible so the
+ * simplicity doesnt really matter). This algorithm
+ * will not work if the user has only one level of domain
+ * naming in their hostname (e.g. if they are on a lan or
+ * are connecting via localhost) -- this doesnt matter much.
+ */
+
+ char* n1 = strchr(dest->host,'.');
+ char* n2 = strchr(dest->host,':');
+
+ if (n1 || n2)
+ {
+ /* InspIRCd users have two hostnames; A displayed
+ * hostname which can be modified by modules (e.g.
+ * to create vhosts, implement chghost, etc) and a
+ * 'real' hostname which you shouldnt write to.
+ */
+
+ unsigned int iv[] = { key1, key2, key3, key4 };
+ std::string a = LastTwoDomainParts(dest->host);
+ std::string b;
+
+ /** Reset the Hash module, and send it our IV and hex table */
+ HashResetRequest(Sender, HashProvider).Send();
+ HashKeyRequest(Sender, HashProvider, iv).Send();
+ HashHexRequest(Sender, HashProvider, xtab[(*dest->host) % 4]);
+
+ /* Generate a cloak using specialized Hash */
+ std::string hostcloak = prefix + "-" + std::string(HashSumRequest(Sender, HashProvider, dest->host).Send()).substr(0,8) + a;
+
+ /* Fix by brain - if the cloaked host is > the max length of a host (64 bytes
+ * according to the DNS RFC) then tough titty, they get cloaked as an IP.
+ * Their ISP shouldnt go to town on subdomains, or they shouldnt have a kiddie
+ * vhost.
+ */
+#ifdef IPV6
+ in6_addr testaddr;
+ in_addr testaddr2;
+ if ((dest->GetProtocolFamily() == AF_INET6) && (inet_pton(AF_INET6,dest->host,&testaddr) < 1) && (hostcloak.length() <= 64))
+ /* Invalid ipv6 address, and ipv6 user (resolved host) */
+ b = hostcloak;
+ else if ((dest->GetProtocolFamily() == AF_INET) && (inet_aton(dest->host,&testaddr2) < 1) && (hostcloak.length() <= 64))
+ /* Invalid ipv4 address, and ipv4 user (resolved host) */
+ b = hostcloak;
+ else
+ /* Valid ipv6 or ipv4 address (not resolved) ipv4 or ipv6 user */
+ b = ((!strchr(dest->host,':')) ? Cloak4(dest->host) : Cloak6(dest->host));
+#else
+ in_addr testaddr;
+ if ((inet_aton(dest->host,&testaddr) < 1) && (hostcloak.length() <= 64))
+ /* Invalid ipv4 address, and ipv4 user (resolved host) */
+ b = hostcloak;
+ else
+ /* Valid ipv4 address (not resolved) ipv4 user */
+ b = Cloak4(dest->host);
+#endif
+
+ dest->ChangeDisplayedHost(b.c_str());
+ }
+
+ dest->SetMode('x',true);
+ return MODEACTION_ALLOW;
+ }
+ }
+ else
+ {
+ if (dest->IsModeSet('x'))
+ {
+ /* User is removing the mode, so just restore their real host
+ * and make it match the displayed one.
+ */
+ dest->ChangeDisplayedHost(dest->host);
+ dest->SetMode('x',false);
+ return MODEACTION_ALLOW;
+ }
+ }
+
+ return MODEACTION_DENY;
+ }
+
+ std::string Cloak4(const char* ip)
+ {
+ unsigned int iv[] = { key1, key2, key3, key4 };
+ irc::sepstream seps(ip, '.');
+ std::string ra[4];;
+ std::string octet[4];
+ int i[4];
+
+ for (int j = 0; j < 4; j++)
+ {
+ octet[j] = seps.GetToken();
+ i[j] = atoi(octet[j].c_str());
+ }
+
+ octet[3] = octet[0] + "." + octet[1] + "." + octet[2] + "." + octet[3];
+ octet[2] = octet[0] + "." + octet[1] + "." + octet[2];
+ octet[1] = octet[0] + "." + octet[1];
+
+ /* Reset the Hash module and send it our IV */
+ HashResetRequest(Sender, HashProvider).Send();
+ HashKeyRequest(Sender, HashProvider, iv).Send();
+
+ /* Send the Hash module a different hex table for each octet group's Hash sum */
+ for (int k = 0; k < 4; k++)
+ {
+ HashHexRequest(Sender, HashProvider, xtab[(iv[k]+i[k]) % 4]).Send();
+ ra[k] = std::string(HashSumRequest(Sender, HashProvider, octet[k]).Send()).substr(0,6);
+ }
+ /* Stick them all together */
+ return std::string().append(ra[0]).append(".").append(ra[1]).append(".").append(ra[2]).append(".").append(ra[3]);
+ }
+
+ std::string Cloak6(const char* ip)
+ {
+ /* Theyre using 4in6 (YUCK). Translate as ipv4 cloak */
+ if (!strncmp(ip, "0::ffff:", 8))
+ return Cloak4(ip + 8);
+
+ /* If we get here, yes it really is an ipv6 ip */
+ unsigned int iv[] = { key1, key2, key3, key4 };
+ std::vector<std::string> hashies;
+ std::string item = "";
+ int rounds = 0;
+
+ /* Reset the Hash module and send it our IV */
+ HashResetRequest(Sender, HashProvider).Send();
+ HashKeyRequest(Sender, HashProvider, iv).Send();
+
+ for (const char* input = ip; *input; input++)
+ {
+ item += *input;
+ if (item.length() > 5)
+ {
+ /* Send the Hash module a different hex table for each octet group's Hash sum */
+ HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send();
+ hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,10));
+ item = "";
+ }
+ rounds++;
+ }
+ if (!item.empty())
+ {
+ /* Send the Hash module a different hex table for each octet group's Hash sum */
+ HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send();
+ hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,10));
+ item = "";
+ }
+ /* Stick them all together */
+ return irc::stringjoiner(":", hashies, 0, hashies.size() - 1).GetJoined();
+ }
+
+ void DoRehash()
+ {
+ ConfigReader Conf(ServerInstance);
+ key1 = key2 = key3 = key4 = 0;
+ key1 = Conf.ReadInteger("cloak","key1",0,true);
+ key2 = Conf.ReadInteger("cloak","key2",0,true);
+ key3 = Conf.ReadInteger("cloak","key3",0,true);
+ key4 = Conf.ReadInteger("cloak","key4",0,true);
+ prefix = Conf.ReadValue("cloak","prefix",0);
+
+ if (prefix.empty())
+ prefix = ServerInstance->Config->Network;
+
+ if (!key1 && !key2 && !key3 && !key4)
+ throw ModuleException("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED!");
+ }
+};
+
class ModuleCloaking : public Module
{
private:
+
+ CloakUser* cu;
+ Module* HashModule;
- Server *Srv;
-
public:
- ModuleCloaking()
+ ModuleCloaking(InspIRCd* Me)
+ : Module::Module(Me)
{
- Srv = new Server;
+ ServerInstance->UseInterface("HashRequest");
+
+ /* Attempt to locate the md5 service provider, bail if we can't find it */
+ HashModule = ServerInstance->FindModule("m_md5.so");
+ if (!HashModule)
+ throw ModuleException("Can't find m_md5.so. Please load m_md5.so before m_cloaking.so.");
+
+ /* Create new mode handler object */
+ cu = new CloakUser(ServerInstance, this, HashModule);
+
+ /* Register it with the core */
+ if (!ServerInstance->AddMode(cu, 'x'))
+ throw ModuleException("Could not add new modes!");
+
+ OnRehash(NULL,"");
}
virtual ~ModuleCloaking()
{
- delete Srv;
+ ServerInstance->Modes->DelMode(cu);
+ DELETE(cu);
+ ServerInstance->DoneWithInterface("HashRequest");
}
virtual Version GetVersion()
{
- return Version(1,0,0,0);
+ // returns the version number of the module to be
+ // listed in /MODULES
+ return Version(1,1,0,2,VF_COMMON|VF_VENDOR,API_VERSION);
}
-
- virtual void OnUserConnect(userrec* user)
+
+ virtual void OnRehash(userrec* user, const std::string ¶meter)
{
- if (strstr(user->dhost,"."))
- {
- std::string a = strstr(user->dhost,".");
- char ra[64];
- long seed,s2;
- memcpy(&seed,user->dhost,sizeof(long));
- memcpy(&s2,a.c_str(),sizeof(long));
- sprintf(ra,"%.8X",seed*s2*strlen(user->host));
- std::string b = Srv->GetNetworkName() + "-" + ra + a;
- Srv->Log(DEBUG,"cloak: allocated "+b);
- strcpy(user->dhost,b.c_str());
- }
+ cu->DoRehash();
}
+ void Implements(char* List)
+ {
+ List[I_OnRehash] = 1;
+ }
};
+// stuff down here is the module-factory stuff. For basic modules you can ignore this.
class ModuleCloakingFactory : public ModuleFactory
{
{
}
- virtual Module * CreateModule()
+ virtual Module * CreateModule(InspIRCd* Me)
{
- return new ModuleCloaking;
+ return new ModuleCloaking(Me);
}
};
{
return new ModuleCloakingFactory;
}
-
projects / user / henk / code / inspircd.git / blobdiff