1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
// Copyright (C) 2021-2023 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Kea Hooks Basic
// Commercial End User License Agreement v2.0. See COPYING file in the premium/
// directory.

#include <config.h>

#include <gss_tsig_context.h><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <gss_tsig_impl.h><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <gss_tsig_log.h><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <process/daemon.h>
#include <exceptions/exceptions.h>
#include <functional><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <sstream><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <string><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.

using namespace isc;
using namespace isc::asiolink;
using namespace isc::gss_tsig;
using namespace isc::d2;
using namespace isc::data;
using namespace isc::dns;
using namespace isc::hooks;
using namespace isc::log;
using namespace isc::process;
using namespace std;

namespace isc {
namespace gss_tsig {

/// @brief The GSS-TSIG hook implementation object.
GssTsigImplPtr impl;

} // end of namespace isc::gss_tsig
} // end of namespace isc

extern "C" {

/// @brief The gss-tsig-get command.
///
/// This command takes an argument id with a string value.
///
/// @param handle CalloutHandle.
/// @return always 0.
int get(CalloutHandle& handle) {
    impl->getHandler(handle);
    return (0);
}

/// @brief The gss-tsig-get-all command.
///
/// @param handle CalloutHandle.
/// @return always 0.
int get_all(CalloutHandle& handle) {
    impl->getAllHandler(handle);
    return (0);
}

/// @brief The gss-tsig-list command.
///
/// @param handle CalloutHandle.
/// @return always 0.
int lists(CalloutHandle& handle) {
    impl->listHandler(handle);
    return (0);
}

/// @brief The gss-tsig-key-get command.
///
/// This command takes an argument name with a string value.
///
/// @param handle CalloutHandle.
/// @return always 0.
int key_get(CalloutHandle& handle) {
    impl->keyGetHandler(handle);
    return (0);
}

/// @brief The gss-tsig-key-expire command.
///
/// This command takes an argument name with a string value.
///
/// @param handle CalloutHandle.
/// @return always 0.
int key_expire(CalloutHandle& handle) {
    impl->keyExpireHandler(handle);
    return (0);
}

/// @brief The gss-tsig-key-del command.
///
/// This command takes an argument name with a string value.
///
/// @param handle CalloutHandle.
/// @return always 0.
int key_del(CalloutHandle& handle) {
    impl->keyDelHandler(handle);
    return (0);
}

/// @brief The gss-tsig-purge command.
///
/// This command takes an argument id with a string value.
///
/// @param handle CalloutHandle.
/// @return always 0.
int purge(CalloutHandle& handle) {
    impl->purgeHandler(handle);
    return (0);
}

/// @brief The gss-tsig-purge-all command.
///
/// @param handle CalloutHandle.
/// @return always 0.
int purge_all(CalloutHandle& handle) {
    impl->purgeAllHandler(handle);
    return (0);
}

/// @brief The gss-tsig-rekey command.
///
/// This command takes an argument id with a string value.
///
/// @param handle CalloutHandle.
/// @return always 0.
int rekey(CalloutHandle& handle) {
    impl->rekeyHandler(handle);
    return (0);
}

/// @brief The gss-tsig-rekey-all command.
///
/// @param handle CalloutHandle.
/// @return always 0.
int rekey_all(CalloutHandle& handle) {
    impl->rekeyAllHandler(handle);
    return (0);
}

/// @brief This function is called when the library is loaded.
///
/// @return always 0.
int load(LibraryHandle& handle) {
    try {
        // Create the implementation object.
        impl.reset(new GssTsigImpl());

        // Make the hook library loadable only by d2.
        const std::string& proc_name = Daemon::getProcName();
        if (proc_name != "kea-dhcp-ddns") {
            isc_throw(Unexpected, "Bad process name: " << proc_name
                      << ", expected kea-dhcp-ddns");
        }

        // Load the configuration (syntax check).
        ConstElementPtr config = handle.getParameters();
        impl->configure(config);

        // Register commands.
        handle.registerCommandCallout("gss-tsig-get", get);
        handle.registerCommandCallout("gss-tsig-get-all", get_all);
        handle.registerCommandCallout("gss-tsig-key-del", key_del);
        handle.registerCommandCallout("gss-tsig-key-expire", key_expire);
        handle.registerCommandCallout("gss-tsig-key-get", key_get);
        handle.registerCommandCallout("gss-tsig-list", lists);
        handle.registerCommandCallout("gss-tsig-purge", purge);
        handle.registerCommandCallout("gss-tsig-purge-all", purge_all);
        handle.registerCommandCallout("gss-tsig-rekey", rekey);
        handle.registerCommandCallout("gss-tsig-rekey-all", rekey_all);
    } catch (const std::exception& ex) {
        LOG_ERROR(gss_tsig_logger, GSS_TSIG_LOAD_FAILED)
            .arg(ex.what());
        return (1);
    }

    LOG_INFO(gss_tsig_logger, GSS_TSIG_LOAD_OK);
    return (0);
}

/// @brief This function is called when the library is unloaded.
///
/// @return always 0.
int unload() {
    if (impl) {
        impl->stop();
    }
    impl.reset();
    LOG_INFO(gss_tsig_logger, GSS_TSIG_UNLOAD_OK);
    return (0);
}

/// @brief This function is called to retrieve the multi-threading compatibility.
///
/// @return 1 which means compatible with multi-threading.
int multi_threading_compatible() {
    return (1);
}

/// This function is called when the server finishes (re)configuration.
///
/// The server reverse map is built and an error is returned when a
/// configuration mismatch is detected.
///
/// @param handle CalloutHandle.
/// @return always 0.
/// @throw Unexpected when something went really wrong.
int d2_srv_configured(CalloutHandle& handle) {
    // First check the status.
    if (handle.getStatus() != CalloutHandle::NEXT_STEP_CONTINUE) {
        return (0);
    }
    // Get the parameters.
    IOServicePtr io_context;
    handle.getArgument("io_context", io_context);
    if (!io_context) {
        const string error("Error: gss_tsig d2_srv_configured: io_context is null");
        handle.setArgument("error", error);
        handle.setStatus(isc::hooks::CalloutHandle::NEXT_STEP_DROP);
        return (1);
    }
    impl->setIoContext(io_context);
    D2CfgContextPtr d2_config;
    handle.getArgument("server_config", d2_config);
    if (!d2_config) {
        const string error("Error: gss_tsig d2_srv_configured: server_config is null");
        handle.setArgument("error", error);
        handle.setStatus(isc::hooks::CalloutHandle::NEXT_STEP_DROP);
        return (1);
    }
    try {
        impl->finishConfigure(d2_config);
        io_context->post([]() { impl->start(); });
    } catch (const std::exception& ex) {
        ostringstream os;
        os << "gss_tsig config mismatch: " << ex.what();
        string error(os.str());
        handle.setArgument("error", error);
        handle.setStatus(CalloutHandle::NEXT_STEP_DROP);
        return (1);
    }
    return (0);
}

/// This function is called when the server selects a DNS server and
/// optionally a TSIG key.
///
/// An usable GSS-TSIG key for the DNS server is looked for:
///  - if GSS-TSIG is not enabled: just return with CONTINUE
///  - if a key was found: overwrite the selected key with it and
///    return with CONTINUE
///  - if no key was found but GSS-TSIG is enabled: return with SKIP
///    (i.e. implement this as GSS-TSIG is required)
///
/// @param handle CalloutHandle.
/// @return always 0.
int select_key(CalloutHandle& handle) {
    // First check the status.
    if (handle.getStatus() != CalloutHandle::NEXT_STEP_CONTINUE) {
        return (0);
    }
    // Get the parameters.
    DnsServerInfoPtr server_info;
    handle.getArgument("current_server", server_info);
    D2TsigKeyPtr tsig_key;
    handle.getArgument("tsig_key", tsig_key);
    // Get the DNS server.
    D2TsigKeyPtr key;
    bool useGssTsig = false;
    bool fallback = false;
    if (server_info) {
        key = impl->findKey(server_info, useGssTsig, fallback);
    }
    if (useGssTsig) {
        if (key) {
            handle.setArgument("tsig_key", key);
        } else if (!fallback) {
            handle.setStatus(CalloutHandle::NEXT_STEP_SKIP);
        }
    }
    return (0);
}

/// @brief This function is called when a command was processed.
///
/// Adds an entry to status-get answer.
///
/// @param handle CalloutHandle.
/// @return always 0.
int command_processed(CalloutHandle& handle) {
    try {
        impl->commandProcessed(handle);
    } catch (const std::exception& ex) {
        LOG_ERROR(gss_tsig_logger, GSS_TSIG_COMMAND_PROCESSED_FAILED)
            .arg(ex.what());
        return (1);
    }

    return (0);
}

} // end extern "C"