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2 * Copyright (C) 2005-2020 by the Quassel Project *
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13 * GNU General Public License for more details. *
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19 ***************************************************************************/
21 /* This file contains an implementation of an LDAP Authenticator, as an example
22 * of what a custom external auth provider could do.
24 * It's based off of this pull request for quassel by abustany:
25 * https://github.com/quassel/quassel/pull/4/
29 #include "ldapauthenticator.h"
34 /* We should use openldap on windows if at all possible, rather than trying to
35 * write some kind of compatiblity routine.
43 LdapAuthenticator::LdapAuthenticator(QObject* parent)
44 : Authenticator(parent)
45 , _connection(nullptr)
48 LdapAuthenticator::~LdapAuthenticator()
50 if (_connection != nullptr) {
51 ldap_unbind_ext(_connection, nullptr, nullptr);
55 bool LdapAuthenticator::isAvailable() const
57 // FIXME: probably this should test if we can speak to the LDAP server.
61 QString LdapAuthenticator::backendId() const
63 // We identify the backend to use for the monolithic core by this identifier.
64 // so only change this string if you _really_ have to and make sure the core
65 // setup for the mono client still works ;)
66 return QString("LDAP");
69 QString LdapAuthenticator::displayName() const
74 QString LdapAuthenticator::description() const
76 return tr("Authenticate users using an LDAP server.");
79 QVariantList LdapAuthenticator::setupData() const
81 // The parameters needed for LDAP.
83 data << "Hostname" << tr("Hostname") << QString{"ldap://localhost"} << "Port" << tr("Port") << DEFAULT_LDAP_PORT << "BindDN"
84 << tr("Bind DN") << QString{} << "BindPassword" << tr("Bind Password") << QString{} << "BaseDN" << tr("Base DN") << QString{}
85 << "Filter" << tr("Filter") << QString{} << "UidAttribute" << tr("UID Attribute") << QString{"uid"};
89 void LdapAuthenticator::setAuthProperties(const QVariantMap& properties, const QProcessEnvironment& environment, bool loadFromEnvironment)
91 if (loadFromEnvironment) {
92 _hostName = environment.value("AUTH_LDAP_HOSTNAME");
93 _port = environment.value("AUTH_LDAP_PORT").toInt();
94 _bindDN = environment.value("AUTH_LDAP_BIND_DN");
95 _bindPassword = environment.value("AUTH_LDAP_BIND_PASSWORD");
96 _baseDN = environment.value("AUTH_LDAP_BASE_DN");
97 _filter = environment.value("AUTH_LDAP_FILTER");
98 _uidAttribute = environment.value("AUTH_LDAP_UID_ATTRIBUTE");
101 _hostName = properties["Hostname"].toString();
102 _port = properties["Port"].toInt();
103 _bindDN = properties["BindDN"].toString();
104 _bindPassword = properties["BindPassword"].toString();
105 _baseDN = properties["BaseDN"].toString();
106 _filter = properties["Filter"].toString();
107 _uidAttribute = properties["UidAttribute"].toString();
111 // TODO: this code is sufficiently general that in the future, perhaps an abstract
112 // class should be created implementing it.
113 // i.e. a provider that does its own thing and then pokes at the current storage
114 // through the default core method.
115 UserId LdapAuthenticator::validateUser(const QString& username, const QString& password)
117 bool result = ldapAuth(username, password);
122 // LDAP is case-insensitive, thus we will lowercase the username, in spite of
123 // a better solution :(
124 const QString lUsername = username.toLower();
126 // If auth succeeds, but the user has not logged into quassel previously, make
127 // a new user for them and return that ID.
128 // Users created via LDAP have empty passwords, but authenticator column = LDAP.
129 // On the other hand, if auth succeeds and the user already exists, do a final
130 // cross-check to confirm we're using the right auth provider.
131 UserId quasselId = Core::getUserId(lUsername);
132 if (!quasselId.isValid()) {
133 return Core::addUser(lUsername, QString(), backendId());
135 else if (!(Core::checkAuthProvider(quasselId, backendId()))) {
141 bool LdapAuthenticator::setup(const QVariantMap& settings, const QProcessEnvironment& environment, bool loadFromEnvironment)
143 setAuthProperties(settings, environment, loadFromEnvironment);
144 bool status = ldapConnect();
148 Authenticator::State LdapAuthenticator::init(const QVariantMap& settings, const QProcessEnvironment& environment, bool loadFromEnvironment)
150 setAuthProperties(settings, environment, loadFromEnvironment);
152 bool status = ldapConnect();
154 qInfo() << qPrintable(backendId()) << "authenticator cannot connect.";
158 qInfo() << qPrintable(backendId()) << "authenticator is ready.";
162 // Method based on abustany LDAP quassel patch.
163 bool LdapAuthenticator::ldapConnect()
165 if (_connection != nullptr) {
169 int res, v = LDAP_VERSION3;
172 QByteArray serverURIArray;
174 // Convert info to hostname:port.
175 serverURI = _hostName + ":" + QString::number(_port);
176 serverURIArray = serverURI.toLocal8Bit();
177 res = ldap_initialize(&_connection, serverURIArray);
179 qInfo() << "LDAP: Connecting to" << serverURI;
181 if (res != LDAP_SUCCESS) {
182 qWarning() << "Could not connect to LDAP server:" << ldap_err2string(res);
186 res = ldap_set_option(_connection, LDAP_OPT_PROTOCOL_VERSION, (void*)&v);
188 if (res != LDAP_SUCCESS) {
189 qWarning() << "Could not set LDAP protocol version to v3:" << ldap_err2string(res);
190 ldap_unbind_ext(_connection, nullptr, nullptr);
191 _connection = nullptr;
198 void LdapAuthenticator::ldapDisconnect()
200 if (_connection == nullptr) {
204 ldap_unbind_ext(_connection, nullptr, nullptr);
205 _connection = nullptr;
208 bool LdapAuthenticator::ldapAuth(const QString& username, const QString& password)
210 if (password.isEmpty()) {
216 // Attempt to establish a connection.
217 if (_connection == nullptr) {
218 if (!ldapConnect()) {
225 // Convert some things to byte arrays as needed.
226 QByteArray bindPassword = _bindPassword.toLocal8Bit();
227 QByteArray bindDN = _bindDN.toLocal8Bit();
228 QByteArray baseDN = _baseDN.toLocal8Bit();
229 QByteArray uidAttribute = _uidAttribute.toLocal8Bit();
231 cred.bv_val = (bindPassword.size() > 0 ? bindPassword.data() : nullptr);
232 cred.bv_len = bindPassword.size();
234 res = ldap_sasl_bind_s(_connection, bindDN.size() > 0 ? bindDN.constData() : nullptr, LDAP_SASL_SIMPLE, &cred, nullptr, nullptr, nullptr);
236 if (res != LDAP_SUCCESS) {
237 qWarning() << "Refusing connection from" << username << "(LDAP bind failed:" << ldap_err2string(res) << ")";
242 LDAPMessage *msg = nullptr, *entry = nullptr;
244 const QByteArray ldapQuery = "(&(" + uidAttribute + '=' + username.toLocal8Bit() + ")" + _filter.toLocal8Bit() + ")";
246 res = ldap_search_ext_s(_connection,
249 ldapQuery.constData(),
258 if (res != LDAP_SUCCESS) {
259 qWarning() << "Refusing connection from" << username << "(LDAP search failed:" << ldap_err2string(res) << ")";
263 if (ldap_count_entries(_connection, msg) > 1) {
264 qWarning() << "Refusing connection from" << username << "(LDAP search returned more than one result)";
269 entry = ldap_first_entry(_connection, msg);
271 if (entry == nullptr) {
272 qWarning() << "Refusing connection from" << username << "(LDAP search returned no results)";
277 QByteArray passwordArray = password.toLocal8Bit();
278 cred.bv_val = passwordArray.data();
279 cred.bv_len = password.size();
281 char* userDN = ldap_get_dn(_connection, entry);
283 res = ldap_sasl_bind_s(_connection, userDN, LDAP_SASL_SIMPLE, &cred, nullptr, nullptr, nullptr);
285 if (res != LDAP_SUCCESS) {
286 qWarning() << "Refusing connection from" << username << "(LDAP authentication failed)";
287 ldap_memfree(userDN);
292 // The original implementation had requiredAttributes. I have not included this code
293 // but it would be easy to re-add if someone wants this feature.
294 // Ben Rosser <bjr@acm.jhu.edu> (12/23/15).
296 ldap_memfree(userDN);