--- /dev/null
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ * 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 "users.h"
+#include "channels.h"
+#include "modules.h"
+
+#include <ldap.h>
+
+#ifdef _WIN32
+# pragma comment(lib, "ldap.lib")
+# pragma comment(lib, "lber.lib")
+#endif
+
+/* $ModDesc: Allow/Deny connections based upon answer from LDAP server */
+/* $LinkerFlags: -lldap */
+
+struct RAIILDAPString
+{
+ char *str;
+
+ RAIILDAPString(char *Str)
+ : str(Str)
+ {
+ }
+
+ ~RAIILDAPString()
+ {
+ ldap_memfree(str);
+ }
+
+ operator char*()
+ {
+ return str;
+ }
+
+ operator std::string()
+ {
+ return str;
+ }
+};
+
+struct RAIILDAPMessage
+{
+ RAIILDAPMessage()
+ {
+ }
+
+ ~RAIILDAPMessage()
+ {
+ dealloc();
+ }
+
+ void dealloc()
+ {
+ ldap_msgfree(msg);
+ }
+
+ operator LDAPMessage*()
+ {
+ return msg;
+ }
+
+ LDAPMessage **operator &()
+ {
+ return &msg;
+ }
+
+ LDAPMessage *msg;
+};
+
+class ModuleLDAPAuth : public Module
+{
+ LocalIntExt ldapAuthed;
+ LocalStringExt ldapVhost;
+ std::string base;
+ std::string attribute;
+ std::string ldapserver;
+ std::string allowpattern;
+ std::string killreason;
+ std::string username;
+ std::string password;
+ std::string vhost;
+ std::vector<std::string> whitelistedcidrs;
+ std::vector<std::pair<std::string, std::string> > requiredattributes;
+ int searchscope;
+ bool verbose;
+ bool useusername;
+ LDAP *conn;
+
+public:
+ ModuleLDAPAuth()
+ : ldapAuthed("ldapauth", this)
+ , ldapVhost("ldapauth_vhost", this)
+ {
+ conn = NULL;
+ }
+
+ void init()
+ {
+ ServerInstance->Modules->AddService(ldapAuthed);
+ ServerInstance->Modules->AddService(ldapVhost);
+ Implementation eventlist[] = { I_OnCheckReady, I_OnRehash,I_OnUserRegister, I_OnUserConnect };
+ ServerInstance->Modules->Attach(eventlist, this, 4);
+ OnRehash(NULL);
+ }
+
+ ~ModuleLDAPAuth()
+ {
+ if (conn)
+ ldap_unbind_ext(conn, NULL, NULL);
+ }
+
+ void OnRehash(User* user)
+ {
+ ConfigTag* tag = ServerInstance->Config->ConfValue("ldapauth");
+ whitelistedcidrs.clear();
+ requiredattributes.clear();
+
+ base = tag->getString("baserdn");
+ attribute = tag->getString("attribute");
+ ldapserver = tag->getString("server");
+ allowpattern = tag->getString("allowpattern");
+ killreason = tag->getString("killreason");
+ std::string scope = tag->getString("searchscope");
+ username = tag->getString("binddn");
+ password = tag->getString("bindauth");
+ vhost = tag->getString("host");
+ verbose = tag->getBool("verbose"); /* Set to true if failed connects should be reported to operators */
+ useusername = tag->getBool("userfield");
+
+ 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));
+ }
+
+ if (scope == "base")
+ searchscope = LDAP_SCOPE_BASE;
+ else if (scope == "onelevel")
+ searchscope = LDAP_SCOPE_ONELEVEL;
+ else searchscope = LDAP_SCOPE_SUBTREE;
+
+ Connect();
+ }
+
+ bool Connect()
+ {
+ if (conn != NULL)
+ ldap_unbind_ext(conn, NULL, NULL);
+ int res, v = LDAP_VERSION3;
+ res = ldap_initialize(&conn, ldapserver.c_str());
+ if (res != LDAP_SUCCESS)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "LDAP connection failed: %s", ldap_err2string(res));
+ conn = NULL;
+ return false;
+ }
+
+ res = ldap_set_option(conn, LDAP_OPT_PROTOCOL_VERSION, (void *)&v);
+ if (res != LDAP_SUCCESS)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "LDAP set protocol to v3 failed: %s", ldap_err2string(res));
+ ldap_unbind_ext(conn, NULL, NULL);
+ conn = NULL;
+ return false;
+ }
+ return true;
+ }
+
+ std::string SafeReplace(const std::string &text, std::map<std::string,
+ std::string> &replacements)
+ {
+ std::string result;
+ result.reserve(MAXBUF);
+
+ 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;
+ }
+
+ virtual void OnUserConnect(LocalUser *user)
+ {
+ std::string* cc = ldapVhost.get(user);
+ if (cc)
+ {
+ user->ChangeDisplayedHost(cc->c_str());
+ ldapVhost.unset(user);
+ }
+ }
+
+ ModResult OnUserRegister(LocalUser* user)
+ {
+ 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 (!CheckCredentials(user))
+ {
+ ServerInstance->Users->QuitUser(user, killreason);
+ return MOD_RES_DENY;
+ }
+ return MOD_RES_PASSTHRU;
+ }
+
+ bool CheckCredentials(LocalUser* user)
+ {
+ if (conn == NULL)
+ if (!Connect())
+ return false;
+
+ if (user->password.empty())
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (No password provided)", user->GetFullRealHost().c_str());
+ return false;
+ }
+
+ int res;
+ // bind anonymously if no bind DN and authentication are given in the config
+ struct berval cred;
+ cred.bv_val = const_cast<char*>(password.c_str());
+ cred.bv_len = password.length();
+
+ if ((res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) != LDAP_SUCCESS)
+ {
+ if (res == LDAP_SERVER_DOWN)
+ {
+ // Attempt to reconnect if the connection dropped
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('a', "LDAP server has gone away - reconnecting...");
+ Connect();
+ res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL);
+ }
+
+ if (res != LDAP_SUCCESS)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (LDAP bind failed: %s)", user->GetFullRealHost().c_str(), ldap_err2string(res));
+ ldap_unbind_ext(conn, NULL, NULL);
+ conn = NULL;
+ return false;
+ }
+ }
+
+ RAIILDAPMessage msg;
+ std::string what = (attribute + "=" + (useusername ? user->ident : user->nick));
+ if ((res = ldap_search_ext_s(conn, base.c_str(), searchscope, what.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg)) != LDAP_SUCCESS)
+ {
+ // Do a second search, based on password, if it contains a :
+ // That is, PASS <user>:<password> will work.
+ size_t pos = user->password.find(":");
+ if (pos != std::string::npos)
+ {
+ // manpage says we must deallocate regardless of success or failure
+ // since we're about to do another query (and reset msg), first
+ // free the old one.
+ msg.dealloc();
+
+ std::string cutpassword = user->password.substr(0, pos);
+ res = ldap_search_ext_s(conn, base.c_str(), searchscope, cutpassword.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg);
+
+ if (res == LDAP_SUCCESS)
+ {
+ // Trim the user: prefix, leaving just 'pass' for later password check
+ user->password = user->password.substr(pos + 1);
+ }
+ }
+
+ // It may have found based on user:pass check above.
+ if (res != LDAP_SUCCESS)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (LDAP search failed: %s)", user->GetFullRealHost().c_str(), ldap_err2string(res));
+ return false;
+ }
+ }
+ if (ldap_count_entries(conn, msg) > 1)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (LDAP search returned more than one result: %s)", user->GetFullRealHost().c_str(), ldap_err2string(res));
+ return false;
+ }
+
+ LDAPMessage *entry;
+ if ((entry = ldap_first_entry(conn, msg)) == NULL)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (LDAP search returned no results: %s)", user->GetFullRealHost().c_str(), ldap_err2string(res));
+ return false;
+ }
+ cred.bv_val = (char*)user->password.data();
+ cred.bv_len = user->password.length();
+ RAIILDAPString DN(ldap_get_dn(conn, entry));
+ if ((res = ldap_sasl_bind_s(conn, DN, LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) != LDAP_SUCCESS)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (%s)", user->GetFullRealHost().c_str(), ldap_err2string(res));
+ return false;
+ }
+
+ if (!requiredattributes.empty())
+ {
+ bool authed = false;
+
+ for (std::vector<std::pair<std::string, std::string> >::const_iterator it = requiredattributes.begin(); it != requiredattributes.end(); ++it)
+ {
+ const std::string &attr = it->first;
+ const std::string &val = it->second;
+
+ struct berval attr_value;
+ attr_value.bv_val = const_cast<char*>(val.c_str());
+ attr_value.bv_len = val.length();
+
+ ServerInstance->Logs->Log("m_ldapauth", DEBUG, "LDAP compare: %s=%s", attr.c_str(), val.c_str());
+
+ authed = (ldap_compare_ext_s(conn, DN, attr.c_str(), &attr_value, NULL, NULL) == LDAP_COMPARE_TRUE);
+
+ if (authed)
+ break;
+ }
+
+ if (!authed)
+ {
+ if (verbose)
+ ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s (Lacks required LDAP attributes)", user->GetFullRealHost().c_str());
+ return false;
+ }
+ }
+
+ 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
+ ldapVhost.set(user, SafeReplace(vhost, dnParts));
+ }
+
+ ldapAuthed.set(user,1);
+ return true;
+ }
+
+ ModResult OnCheckReady(LocalUser* user)
+ {
+ return ldapAuthed.get(user) ? MOD_RES_PASSTHRU : MOD_RES_DENY;
+ }
+
+ Version GetVersion()
+ {
+ return Version("Allow/Deny connections based upon answer from LDAP server", VF_VENDOR);
+ }
+
+};
+
+MODULE_INIT(ModuleLDAPAuth)
projects / user / henk / code / inspircd.git / blobdiff