* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
- * InspIRCd: (C) 2002-2007 InspIRCd Development Team
- * See: http://www.inspircd.org/wiki/index.php/Credits
+ * InspIRCd: (C) 2002-2009 InspIRCd Development Team
+ * See: http://wiki.inspircd.org/Credits
*
* This program is free but copyrighted software; see
- * the file COPYING for details.
+ * 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"};
+enum CloakMode
+{
+ /** 1.2-compatible host-based cloak */
+ MODE_COMPAT_HOST,
+ /** 1.2-compatible IP-only cloak */
+ MODE_COMPAT_IPONLY,
+ /** 2.0 cloak of "half" of the hostname plus the full IP hash */
+ MODE_HALF_CLOAK,
+ /** 2.0 cloak of IP hash, split at 2 common CIDR range points */
+ MODE_OPAQUE
+};
+
+// lowercase-only encoding similar to base64, used for hash output
+static const char base32[] = "0123456789abcdefghijklmnopqrstuv";
/** 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)
+ LocalStringExt ext;
+
+ CloakUser(Module* source)
+ : ModeHandler(source, "cloak", 'x', PARAM_NONE, MODETYPE_USER),
+ ext("cloaked_host", source)
{
}
- ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string ¶meter, bool adding)
+ ModeAction OnModeChange(User* source, User* dest, Channel* 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.
+ /* For remote clients, we don't take any action, we just allow it.
* The local server where they are will set their cloak instead.
+ * This is fine, as we will receive it later.
*/
if (!IS_LOCAL(dest))
+ {
+ dest->SetMode('x',adding);
return MODEACTION_ALLOW;
+ }
+
+ /* don't allow this user to spam modechanges */
+ dest->IncreasePenalty(5);
if (adding)
{
* 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;
+ std::string* cloak = ext.get(dest);
- /** 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());
+ if (!cloak)
+ {
+ /* Force creation of missing cloak */
+ creator->OnUserConnect(dest);
+ cloak = ext.get(dest);
+ }
+ if (cloak)
+ {
+ dest->ChangeDisplayedHost(cloak->c_str());
+ dest->SetMode('x',true);
+ return MODEACTION_ALLOW;
}
-
- 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.
+ /* User is removing the mode, so just restore their real host
+ * and make it match the displayed one.
*/
- dest->ChangeDisplayedHost(dest->host);
+ dest->ChangeDisplayedHost(dest->host.c_str());
dest->SetMode('x',false);
return MODEACTION_ALLOW;
}
return MODEACTION_DENY;
}
- std::string Cloak4(const char* ip)
+};
+
+
+class ModuleCloaking : public Module
+{
+ private:
+ CloakUser cu;
+ CloakMode mode;
+ std::string prefix;
+ std::string key;
+ unsigned int compatkey[4];
+ const char* xtab[4];
+ Module* HashProvider;
+
+ public:
+ ModuleCloaking() : cu(this)
+ {
+ /* Attempt to locate the md5 service provider, bail if we can't find it */
+ HashProvider = ServerInstance->Modules->Find("m_md5.so");
+ if (!HashProvider)
+ throw ModuleException("Can't find m_md5.so. Please load m_md5.so before m_cloaking.so.");
+
+ OnRehash(NULL);
+
+ /* Register it with the core */
+ if (!ServerInstance->Modes->AddMode(&cu))
+ throw ModuleException("Could not add new modes!");
+
+ ServerInstance->Modules->UseInterface("HashRequest");
+ ServerInstance->Extensions.Register(&cu.ext);
+
+ Implementation eventlist[] = { I_OnRehash, I_OnCheckBan, I_OnUserConnect };
+ ServerInstance->Modules->Attach(eventlist, this, 3);
+
+ CloakExistingUsers();
+ }
+
+ /** 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);
+ }
+
+ std::string CompatCloak4(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();
+ seps.GetToken(octet[j]);
i[j] = atoi(octet[j].c_str());
}
octet[1] = octet[0] + "." + octet[1];
/* Reset the Hash module and send it our IV */
- HashResetRequest(Sender, HashProvider).Send();
- HashKeyRequest(Sender, HashProvider, iv).Send();
+
+ std::string rv;
/* 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);
+ HashRequestIV hash(this, HashProvider, compatkey, xtab[(compatkey[k]+i[k]) % 4], octet[k]);
+ rv.append(hash.result.substr(0,6));
+ if (k < 3)
+ rv.append(".");
}
/* Stick them all together */
- return std::string().append(ra[0]).append(".").append(ra[1]).append(".").append(ra[2]).append(".").append(ra[3]);
+ return rv;
}
- std::string Cloak6(const char* ip)
+ std::string CompatCloak6(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 = "";
+ 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)
+ if (item.length() > 7)
{
- /* 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 = "";
+ HashRequestIV hash(this, HashProvider, compatkey, xtab[(compatkey[1]+rounds) % 4], item);
+ hashies.push_back(hash.result.substr(0,8));
+ item.clear();
}
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 = "";
+ HashRequestIV hash(this, HashProvider, compatkey, xtab[(compatkey[1]+rounds) % 4], item);
+ hashies.push_back(hash.result.substr(0,8));
}
/* 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!");
+ std::string ReversePartialIP(const irc::sockets::sockaddrs& ip)
+ {
+ char rv[50];
+ if (ip.sa.sa_family == AF_INET6)
+ {
+ snprintf(rv, 50, ".%02x%02x.%02x%02x.%02x%02x.IP",
+ ip.in6.sin6_addr.s6_addr[4], ip.in6.sin6_addr.s6_addr[5],
+ ip.in6.sin6_addr.s6_addr[2], ip.in6.sin6_addr.s6_addr[3],
+ ip.in6.sin6_addr.s6_addr[0], ip.in6.sin6_addr.s6_addr[1]);
+ }
+ else
+ {
+ const unsigned char* ip4 = (const unsigned char*)&ip.in4.sin_addr;
+ snprintf(rv, 50, ".%d.%d.IP", ip4[1], ip4[0]);
+ }
+ return rv;
}
-};
-
-
-class ModuleCloaking : public Module
-{
- private:
-
- CloakUser* cu;
- Module* HashModule;
- public:
- ModuleCloaking(InspIRCd* Me)
- : Module::Module(Me)
+ std::string SegmentIP(const irc::sockets::sockaddrs& ip)
{
- 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!");
+ std::string bindata;
+ int hop1, hop2;
+ if (ip.sa.sa_family == AF_INET6)
+ {
+ bindata = std::string((const char*)ip.in6.sin6_addr.s6_addr, 16);
+ hop1 = 8;
+ hop2 = 6;
+ }
+ else
+ {
+ bindata = std::string((const char*)&ip.in4.sin_addr, 4);
+ hop1 = 3;
+ hop2 = 2;
+ }
- OnRehash(NULL,"");
+ std::string rv;
+ rv.reserve(prefix.length() + 30);
+ rv.append(prefix);
+ rv.append(SegmentCloak(bindata, 2));
+ rv.append(1, '.');
+ bindata.erase(hop1);
+ rv.append(SegmentCloak(bindata, 3));
+ rv.append(1, '.');
+ bindata.erase(hop2);
+ rv.append(SegmentCloak(bindata, 4));
+ rv.append(".IP");
+ return rv;
}
-
- virtual ~ModuleCloaking()
+
+ std::string SegmentCloak(const std::string& item, char id)
{
- ServerInstance->Modes->DelMode(cu);
- DELETE(cu);
- ServerInstance->DoneWithInterface("HashRequest");
+ std::string input;
+ input.reserve(key.length() + 3 + item.length());
+ input.append(1, id);
+ input.append(key);
+ input.append(1, 0); // null does not terminate a C++ string
+ input.append(item);
+
+ HashRequest hash(this, HashProvider, input);
+ std::string rv = hash.binresult.substr(0,6);
+ for(int i=0; i < 6; i++)
+ {
+ // this discards 3 bits per byte. We have an
+ // overabundance of bits in the hash output, doesn't
+ // matter which ones we are discarding.
+ rv[i] = base32[rv[i] & 0x1F];
+ }
+ return rv;
}
-
- virtual Version GetVersion()
+
+ void CloakExistingUsers()
{
- // returns the version number of the module to be
- // listed in /MODULES
- return Version(1,1,0,2,VF_COMMON|VF_VENDOR,API_VERSION);
+ std::string* cloak;
+ for (std::vector<User*>::iterator u = ServerInstance->Users->local_users.begin(); u != ServerInstance->Users->local_users.end(); u++)
+ {
+ cloak = cu.ext.get(*u);
+ if (!cloak)
+ {
+ OnUserConnect(*u);
+ }
+ }
}
- virtual void OnRehash(userrec* user, const std::string ¶meter)
+ ModResult OnCheckBan(User* user, Channel* chan, const std::string& mask)
{
- cu->DoRehash();
+ char cmask[MAXBUF];
+ std::string* cloak = cu.ext.get(user);
+ /* Check if they have a cloaked host, but are not using it */
+ if (cloak && *cloak != user->dhost)
+ {
+ snprintf(cmask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), cloak->c_str());
+ if (InspIRCd::Match(cmask,mask))
+ return MOD_RES_DENY;
+ }
+ return MOD_RES_PASSTHRU;
}
- void Implements(char* List)
+ void Prioritize()
{
- List[I_OnRehash] = 1;
+ /* Needs to be after m_banexception etc. */
+ ServerInstance->Modules->SetPriority(this, I_OnCheckBan, PRIORITY_LAST);
}
-};
-// stuff down here is the module-factory stuff. For basic modules you can ignore this.
+ ~ModuleCloaking()
+ {
+ ServerInstance->Modules->DoneWithInterface("HashRequest");
+ }
-class ModuleCloakingFactory : public ModuleFactory
-{
- public:
- ModuleCloakingFactory()
+ Version GetVersion()
{
+ // returns the version number of the module to be
+ // listed in /MODULES
+ return Version("Provides masking of user hostnames", VF_COMMON|VF_VENDOR,API_VERSION);
}
-
- ~ModuleCloakingFactory()
+
+ void OnRehash(User* user)
{
+ ConfigReader Conf;
+ prefix = Conf.ReadValue("cloak","prefix",0);
+
+ std::string modestr = Conf.ReadValue("cloak", "mode", 0);
+ if (modestr == "compat-host")
+ mode = MODE_COMPAT_HOST;
+ else if (modestr == "compat-ip")
+ mode = MODE_COMPAT_IPONLY;
+ else if (modestr == "half")
+ mode = MODE_HALF_CLOAK;
+ else if (modestr == "full")
+ mode = MODE_OPAQUE;
+ else
+ throw ModuleException("Bad value for <cloak:mode>; must be one of compat-host, compat-ip, half, full");
+
+ if (mode == MODE_COMPAT_HOST || mode == MODE_COMPAT_IPONLY)
+ {
+ bool lowercase = Conf.ReadFlag("cloak", "lowercase", 0);
+
+ /* These are *not* using the need_positive parameter of ReadInteger -
+ * that will limit the valid values to only the positive values in a
+ * signed int. Instead, accept any value that fits into an int and
+ * cast it to an unsigned int. That will, a bit oddly, give us the full
+ * spectrum of an unsigned integer. - Special
+ *
+ * We must limit the keys or else we get different results on
+ * amd64/x86 boxes. - psychon */
+ const unsigned int limit = 0x80000000;
+ compatkey[1] = (unsigned int) Conf.ReadInteger("cloak","key1",0,false);
+ compatkey[2] = (unsigned int) Conf.ReadInteger("cloak","key2",0,false);
+ compatkey[3] = (unsigned int) Conf.ReadInteger("cloak","key3",0,false);
+ compatkey[4] = (unsigned int) Conf.ReadInteger("cloak","key4",0,false);
+
+ if (!lowercase)
+ {
+ xtab[0] = "F92E45D871BCA630";
+ xtab[1] = "A1B9D80C72E653F4";
+ xtab[2] = "1ABC078934DEF562";
+ xtab[3] = "ABCDEF5678901234";
+ }
+ else
+ {
+ xtab[0] = "f92e45d871bca630";
+ xtab[1] = "a1b9d80c72e653f4";
+ xtab[2] = "1abc078934def562";
+ xtab[3] = "abcdef5678901234";
+ }
+
+ if (prefix.empty())
+ prefix = ServerInstance->Config->Network;
+
+ if (!compatkey[1] || !compatkey[2] || !compatkey[3] || !compatkey[4] ||
+ compatkey[1] >= limit || compatkey[2] >= limit || compatkey[3] >= limit || compatkey[4] >= limit)
+ {
+ std::string detail;
+ if (!compatkey[1] || compatkey[1] >= limit)
+ detail = "<cloak:key1> is not valid, it may be set to a too high/low value, or it may not exist.";
+ else if (!compatkey[2] || compatkey[2] >= limit)
+ detail = "<cloak:key2> is not valid, it may be set to a too high/low value, or it may not exist.";
+ else if (!compatkey[3] || compatkey[3] >= limit)
+ detail = "<cloak:key3> is not valid, it may be set to a too high/low value, or it may not exist.";
+ else if (!compatkey[4] || compatkey[4] >= limit)
+ detail = "<cloak:key4> is not valid, it may be set to a too high/low value, or it may not exist.";
+
+ throw ModuleException("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED! - " + detail);
+ }
+ }
+ else
+ {
+ key = Conf.ReadFlag("cloak", "key", 0);
+ if (key.empty() || key == "secret")
+ throw ModuleException("You have not defined cloak keys for m_cloaking. Define <cloak:key> as a network-wide secret.");
+ }
}
-
- virtual Module * CreateModule(InspIRCd* Me)
+
+ void OnUserConnect(User* dest)
{
- return new ModuleCloaking(Me);
+ std::string* cloak = cu.ext.get(dest);
+ if (cloak)
+ return;
+
+ if (dest->host.find('.') == std::string::npos && dest->host.find(':') == std::string::npos)
+ return;
+
+ std::string ipstr = dest->GetIPString();
+ std::string chost;
+
+ switch (mode)
+ {
+ case MODE_COMPAT_HOST:
+ {
+ if (ipstr != dest->host)
+ {
+ std::string tail = LastTwoDomainParts(dest->host);
+
+ /** Reset the Hash module, and send it our IV and hex table */
+ HashRequestIV hash(this, HashProvider, compatkey, xtab[(dest->host[0]) % 4], dest->host);
+
+ /* Generate a cloak using specialized Hash */
+ chost = prefix + "-" + hash.result.substr(0,8) + tail;
+
+ /* Fix by brain - if the cloaked host is > the max length of a host (64 bytes
+ * according to the DNS RFC) then they get cloaked as an IP.
+ */
+ if (chost.length() <= 64)
+ break;
+ }
+ // fall through to IP cloak
+ }
+ case MODE_COMPAT_IPONLY:
+ if (dest->client_sa.sa.sa_family == AF_INET6)
+ chost = CompatCloak6(ipstr.c_str());
+ else
+ chost = CompatCloak4(ipstr.c_str());
+ break;
+ case MODE_HALF_CLOAK:
+ {
+ std::string tail;
+ if (ipstr != dest->host)
+ tail = LastTwoDomainParts(dest->host);
+ if (tail.empty() || tail.length() > 50)
+ tail = ReversePartialIP(dest->client_sa);
+ chost = prefix + SegmentCloak(dest->host, 1) + tail;
+ break;
+ }
+ case MODE_OPAQUE:
+ default:
+ chost = prefix + SegmentIP(dest->client_sa);
+ }
+ cu.ext.set(dest,chost);
}
-
-};
+};
-extern "C" void * init_module( void )
-{
- return new ModuleCloakingFactory;
-}
+MODULE_INIT(ModuleCloaking)