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-rw-r--r--src/modules/m_ldapauth.cpp391
1 files changed, 391 insertions, 0 deletions
diff --git a/src/modules/m_ldapauth.cpp b/src/modules/m_ldapauth.cpp
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+++ b/src/modules/m_ldapauth.cpp
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+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ * Copyright (C) 2013 Adam <Adam@anope.org>
+ * Copyright (C) 2011 Pierre Carrier <pierre@spotify.com>
+ * Copyright (C) 2009-2010 Robin Burchell <robin+git@viroteck.net>
+ * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
+ * Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
+ * Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
+ * Copyright (C) 2008 Dennis Friis <peavey@inspircd.org>
+ * Copyright (C) 2007 Carsten Valdemar Munk <carsten.munk+inspircd@gmail.com>
+ *
+ * This file is part of InspIRCd. InspIRCd is free software: you can
+ * redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "inspircd.h"
+#include "modules/ldap.h"
+
+namespace
+{
+ Module* me;
+ std::string killreason;
+ LocalIntExt* authed;
+ bool verbose;
+ std::string vhost;
+ LocalStringExt* vhosts;
+ std::vector<std::pair<std::string, std::string> > requiredattributes;
+}
+
+class BindInterface : public LDAPInterface
+{
+ const std::string provider;
+ const std::string uid;
+ std::string DN;
+ bool checkingAttributes;
+ bool passed;
+ int attrCount;
+
+ static std::string SafeReplace(const std::string& text, std::map<std::string, std::string>& replacements)
+ {
+ std::string result;
+ result.reserve(text.length());
+
+ for (unsigned int i = 0; i < text.length(); ++i)
+ {
+ char c = text[i];
+ if (c == '$')
+ {
+ // find the first nonalpha
+ i++;
+ unsigned int start = i;
+
+ while (i < text.length() - 1 && isalpha(text[i + 1]))
+ ++i;
+
+ std::string key = text.substr(start, (i - start) + 1);
+ result.append(replacements[key]);
+ }
+ else
+ result.push_back(c);
+ }
+
+ return result;
+ }
+
+ static void SetVHost(User* user, const std::string& DN)
+ {
+ if (!vhost.empty())
+ {
+ irc::commasepstream stream(DN);
+
+ // mashed map of key:value parts of the DN
+ std::map<std::string, std::string> dnParts;
+
+ std::string dnPart;
+ while (stream.GetToken(dnPart))
+ {
+ std::string::size_type pos = dnPart.find('=');
+ if (pos == std::string::npos) // malformed
+ continue;
+
+ std::string key = dnPart.substr(0, pos);
+ std::string value = dnPart.substr(pos + 1, dnPart.length() - pos + 1); // +1s to skip the = itself
+ dnParts[key] = value;
+ }
+
+ // change host according to config key
+ vhosts->set(user, SafeReplace(vhost, dnParts));
+ }
+ }
+
+ public:
+ BindInterface(Module* c, const std::string& p, const std::string& u, const std::string& dn)
+ : LDAPInterface(c)
+ , provider(p), uid(u), DN(dn), checkingAttributes(false), passed(false), attrCount(0)
+ {
+ }
+
+ void OnResult(const LDAPResult& r) CXX11_OVERRIDE
+ {
+ User* user = ServerInstance->FindUUID(uid);
+ dynamic_reference<LDAPProvider> LDAP(me, provider);
+
+ if (!user || !LDAP)
+ {
+ if (!checkingAttributes || !--attrCount)
+ delete this;
+ return;
+ }
+
+ if (!checkingAttributes && requiredattributes.empty())
+ {
+ // We're done, there are no attributes to check
+ SetVHost(user, DN);
+ authed->set(user, 1);
+
+ delete this;
+ return;
+ }
+
+ // Already checked attributes?
+ if (checkingAttributes)
+ {
+ if (!passed)
+ {
+ // Only one has to pass
+ passed = true;
+
+ SetVHost(user, DN);
+ authed->set(user, 1);
+ }
+
+ // Delete this if this is the last ref
+ if (!--attrCount)
+ delete this;
+
+ return;
+ }
+
+ // check required attributes
+ checkingAttributes = true;
+
+ for (std::vector<std::pair<std::string, std::string> >::const_iterator it = requiredattributes.begin(); it != requiredattributes.end(); ++it)
+ {
+ // Note that only one of these has to match for it to be success
+ const std::string& attr = it->first;
+ const std::string& val = it->second;
+
+ ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "LDAP compare: %s=%s", attr.c_str(), val.c_str());
+ try
+ {
+ LDAP->Compare(this, DN, attr, val);
+ ++attrCount;
+ }
+ catch (LDAPException &ex)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Unable to compare attributes %s=%s: %s", attr.c_str(), val.c_str(), ex.GetReason().c_str());
+ }
+ }
+
+ // Nothing done
+ if (!attrCount)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (unable to validate attributes)", user->GetFullRealHost().c_str());
+ ServerInstance->Users->QuitUser(user, killreason);
+ delete this;
+ }
+ }
+
+ void OnError(const LDAPResult& err) CXX11_OVERRIDE
+ {
+ if (checkingAttributes && --attrCount)
+ return;
+
+ if (passed)
+ {
+ delete this;
+ return;
+ }
+
+ User* user = ServerInstance->FindUUID(uid);
+ if (user)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (%s)", user->GetFullRealHost().c_str(), err.getError().c_str());
+ ServerInstance->Users->QuitUser(user, killreason);
+ }
+
+ delete this;
+ }
+};
+
+class SearchInterface : public LDAPInterface
+{
+ const std::string provider;
+ const std::string uid;
+
+ public:
+ SearchInterface(Module* c, const std::string& p, const std::string& u)
+ : LDAPInterface(c), provider(p), uid(u)
+ {
+ }
+
+ void OnResult(const LDAPResult& r) CXX11_OVERRIDE
+ {
+ LocalUser* user = static_cast<LocalUser*>(ServerInstance->FindUUID(uid));
+ dynamic_reference<LDAPProvider> LDAP(me, provider);
+ if (!LDAP || r.empty() || !user)
+ {
+ if (user)
+ ServerInstance->Users->QuitUser(user, killreason);
+ delete this;
+ return;
+ }
+
+ try
+ {
+ const LDAPAttributes& a = r.get(0);
+ std::string bindDn = a.get("dn");
+ if (bindDn.empty())
+ {
+ if (user)
+ ServerInstance->Users->QuitUser(user, killreason);
+ delete this;
+ return;
+ }
+
+ LDAP->Bind(new BindInterface(this->creator, provider, uid, bindDn), bindDn, user->password);
+ }
+ catch (LDAPException& ex)
+ {
+ ServerInstance->SNO->WriteToSnoMask('a', "Error searching LDAP server: " + ex.GetReason());
+ }
+ delete this;
+ }
+
+ void OnError(const LDAPResult& err) CXX11_OVERRIDE
+ {
+ ServerInstance->SNO->WriteToSnoMask('a', "Error searching LDAP server: %s", err.getError().c_str());
+ User* user = ServerInstance->FindUUID(uid);
+ if (user)
+ ServerInstance->Users->QuitUser(user, killreason);
+ delete this;
+ }
+};
+
+class ModuleLDAPAuth : public Module
+{
+ dynamic_reference<LDAPProvider> LDAP;
+ LocalIntExt ldapAuthed;
+ LocalStringExt ldapVhost;
+ std::string base;
+ std::string attribute;
+ std::string allowpattern;
+ std::vector<std::string> whitelistedcidrs;
+ bool useusername;
+
+public:
+ ModuleLDAPAuth()
+ : LDAP(this, "LDAP")
+ , ldapAuthed("ldapauth", this)
+ , ldapVhost("ldapauth_vhost", this)
+ {
+ me = this;
+ authed = &ldapAuthed;
+ vhosts = &ldapVhost;
+ }
+
+ void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
+ {
+ ConfigTag* tag = ServerInstance->Config->ConfValue("ldapauth");
+ whitelistedcidrs.clear();
+ requiredattributes.clear();
+
+ base = tag->getString("baserdn");
+ attribute = tag->getString("attribute");
+ allowpattern = tag->getString("allowpattern");
+ killreason = tag->getString("killreason");
+ vhost = tag->getString("host");
+ // Set to true if failed connects should be reported to operators
+ verbose = tag->getBool("verbose");
+ useusername = tag->getBool("userfield");
+
+ LDAP.SetProvider("LDAP/" + tag->getString("dbid"));
+
+ ConfigTagList whitelisttags = ServerInstance->Config->ConfTags("ldapwhitelist");
+
+ for (ConfigIter i = whitelisttags.first; i != whitelisttags.second; ++i)
+ {
+ std::string cidr = i->second->getString("cidr");
+ if (!cidr.empty()) {
+ whitelistedcidrs.push_back(cidr);
+ }
+ }
+
+ ConfigTagList attributetags = ServerInstance->Config->ConfTags("ldaprequire");
+
+ for (ConfigIter i = attributetags.first; i != attributetags.second; ++i)
+ {
+ const std::string attr = i->second->getString("attribute");
+ const std::string val = i->second->getString("value");
+
+ if (!attr.empty() && !val.empty())
+ requiredattributes.push_back(make_pair(attr, val));
+ }
+ }
+
+ void OnUserConnect(LocalUser *user) CXX11_OVERRIDE
+ {
+ std::string* cc = ldapVhost.get(user);
+ if (cc)
+ {
+ user->ChangeDisplayedHost(cc->c_str());
+ ldapVhost.unset(user);
+ }
+ }
+
+ ModResult OnUserRegister(LocalUser* user) CXX11_OVERRIDE
+ {
+ if ((!allowpattern.empty()) && (InspIRCd::Match(user->nick,allowpattern)))
+ {
+ ldapAuthed.set(user,1);
+ return MOD_RES_PASSTHRU;
+ }
+
+ for (std::vector<std::string>::iterator i = whitelistedcidrs.begin(); i != whitelistedcidrs.end(); i++)
+ {
+ if (InspIRCd::MatchCIDR(user->GetIPString(), *i, ascii_case_insensitive_map))
+ {
+ ldapAuthed.set(user,1);
+ return MOD_RES_PASSTHRU;
+ }
+ }
+
+ if (user->password.empty())
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (No password provided)", user->GetFullRealHost().c_str());
+ ServerInstance->Users->QuitUser(user, killreason);
+ return MOD_RES_DENY;
+ }
+
+ if (!LDAP)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (Unable to find LDAP provider)", user->GetFullRealHost().c_str());
+ ServerInstance->Users->QuitUser(user, killreason);
+ return MOD_RES_DENY;
+ }
+
+ try
+ {
+ LDAP->BindAsManager(NULL);
+
+ std::string what = attribute + "=" + (useusername ? user->ident : user->nick);
+ LDAP->Search(new SearchInterface(this, LDAP.GetProvider(), user->uuid), base, what);
+ }
+ catch (LDAPException &ex)
+ {
+ ServerInstance->SNO->WriteToSnoMask('a', "LDAP exception: " + ex.GetReason());
+ ServerInstance->Users->QuitUser(user, killreason);
+ }
+
+ return MOD_RES_DENY;
+ }
+
+ ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
+ {
+ return ldapAuthed.get(user) ? MOD_RES_PASSTHRU : MOD_RES_DENY;
+ }
+
+ Version GetVersion() CXX11_OVERRIDE
+ {
+ return Version("Allow/Deny connections based upon answer from LDAP server", VF_VENDOR);
+ }
+};
+
+MODULE_INIT(ModuleLDAPAuth)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 01:11:24 +0000