X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fextra%2Fm_ldapauth.cpp;h=827179f84ebb0c225d39ff262cc1c5baf82968c5;hb=c202dea024542b9c6c6b771bb9a3a081d9eacdc5;hp=fb1eea70097dc2d8d5247715e48bf47e0db6eed9;hpb=3b6b61dd2625782b32686a3aa8fccd87b5bfd24d;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/extra/m_ldapauth.cpp b/src/modules/extra/m_ldapauth.cpp deleted file mode 120000 index fb1eea700..000000000 --- a/src/modules/extra/m_ldapauth.cpp +++ /dev/null @@ -1 +0,0 @@ -extra/m_ldapauth.cpp \ No newline at end of file diff --git a/src/modules/extra/m_ldapauth.cpp b/src/modules/extra/m_ldapauth.cpp new file mode 100644 index 000000000..827179f84 --- /dev/null +++ b/src/modules/extra/m_ldapauth.cpp @@ -0,0 +1,431 @@ +/* + * InspIRCd -- Internet Relay Chat Daemon + * + * Copyright (C) 2011 Pierre Carrier + * Copyright (C) 2009-2010 Robin Burchell + * Copyright (C) 2009 Daniel De Graaf + * Copyright (C) 2008 Pippijn van Steenhoven + * Copyright (C) 2008 Craig Edwards + * Copyright (C) 2008 Dennis Friis + * Copyright (C) 2007 Carsten Valdemar Munk + * + * 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 . + */ + + +#include "inspircd.h" +#include "users.h" +#include "channels.h" +#include "modules.h" + +#include + +#ifdef _WIN32 +# pragma comment(lib, "ldap.lib") +# pragma comment(lib, "lber.lib") +#endif + +/* $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 whitelistedcidrs; + std::vector > requiredattributes; + int searchscope; + bool verbose; + bool useusername; + LDAP *conn; + +public: + ModuleLDAPAuth() + : ldapAuthed("ldapauth", this) + , ldapVhost("ldapauth_vhost", this) + { + conn = NULL; + } + + void init() CXX11_OVERRIDE + { + ServerInstance->Modules->AddService(ldapAuthed); + ServerInstance->Modules->AddService(ldapVhost); + } + + ~ModuleLDAPAuth() + { + if (conn) + ldap_unbind_ext(conn, NULL, NULL); + } + + void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE + { + 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 &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; + } + + 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::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(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 : 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 >::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(val.c_str()); + attr_value.bv_len = val.length(); + + ServerInstance->Logs->Log(MODNAME, LOG_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 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) 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)