src/libcharon/daemon.c

   1 /*
   2  * Copyright (C) 2006-2010 Tobias Brunner
   3  * Copyright (C) 2005-2009 Martin Willi
   4  * Copyright (C) 2006 Daniel Roethlisberger
   5  * Copyright (C) 2005 Jan Hutter
   6  * Hochschule fuer Technik Rapperswil
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2 of the License, or (at your
  11  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  */
  18
  19 #include <stdio.h>
  20 #include <sys/types.h>
  21 #include <unistd.h>
  22 #include <time.h>
  23
  24 #ifdef CAPABILITIES
  25 # ifdef HAVE_SYS_CAPABILITY_H
  26 #  include <sys/capability.h>
  27 # elif defined(CAPABILITIES_NATIVE)
  28 #  include <linux/capability.h>
  29 # endif /* CAPABILITIES_NATIVE */
  30 #endif /* CAPABILITIES */
  31
  32 #define USE_TNC /* for tnccs_manager */
  33
  34 #include "daemon.h"
  35
  36 #include <library.h>
  37 #include <config/proposal.h>
  38 #include <kernel/kernel_handler.h>
  39 #include <processing/jobs/start_action_job.h>
  40
  41 typedef struct private_daemon_t private_daemon_t;
  42
  43 /**
  44  * Private additions to daemon_t, contains threads and internal functions.
  45  */
  46 struct private_daemon_t {
  47         /**
  48          * Public members of daemon_t.
  49          */
  50         daemon_t public;
  51
  52         /**
  53          * Handler for kernel events
  54          */
  55         kernel_handler_t *kernel_handler;
  56
  57         /**
  58          * capabilities to keep
  59          */
  60 #ifdef CAPABILITIES_LIBCAP
  61         cap_t caps;
  62 #endif /* CAPABILITIES_LIBCAP */
  63 #ifdef CAPABILITIES_NATIVE
  64         struct __user_cap_data_struct caps[2];
  65 #endif /* CAPABILITIES_NATIVE */
  66
  67 };
  68
  69 /**
  70  * One and only instance of the daemon.
  71  */
  72 daemon_t *charon;
  73
  74 /**
  75  * hook in library for debugging messages
  76  */
  77 extern void (*dbg) (debug_t group, level_t level, char *fmt, ...);
  78
  79 /**
  80  * we store the previous debug function so we can reset it
  81  */
  82 static void (*dbg_old) (debug_t group, level_t level, char *fmt, ...);
  83
  84 /**
  85  * Logging hook for library logs, spreads debug message over bus
  86  */
  87 static void dbg_bus(debug_t group, level_t level, char *fmt, ...)
  88 {
  89         va_list args;
  90
  91         va_start(args, fmt);
  92         charon->bus->vlog(charon->bus, group, level, fmt, args);
  93         va_end(args);
  94 }
  95
  96 /**
  97  * Clean up all daemon resources
  98  */
  99 static void destroy(private_daemon_t *this)
 100 {
 101         /* terminate all idle threads */
 102         lib->processor->set_threads(lib->processor, 0);
 103
 104         /* close all IKE_SAs */
 105         if (this->public.ike_sa_manager)
 106         {
 107                 this->public.ike_sa_manager->flush(this->public.ike_sa_manager);
 108         }
 109         if (this->public.traps)
 110         {
 111                 this->public.traps->flush(this->public.traps);
 112         }
 113         DESTROY_IF(this->public.receiver);
 114         DESTROY_IF(this->public.sender);
 115         /* unload plugins to release threads */
 116         lib->plugins->unload(lib->plugins);
 117 #ifdef CAPABILITIES_LIBCAP
 118         cap_free(this->caps);
 119 #endif /* CAPABILITIES_LIBCAP */
 120         DESTROY_IF(this->kernel_handler);
 121         DESTROY_IF(this->public.traps);
 122         DESTROY_IF(this->public.shunts);
 123         DESTROY_IF(this->public.ike_sa_manager);
 124         DESTROY_IF(this->public.controller);
 125         DESTROY_IF(this->public.eap);
 126         DESTROY_IF(this->public.tnccs);
 127 #ifdef ME
 128         DESTROY_IF(this->public.connect_manager);
 129         DESTROY_IF(this->public.mediation_manager);
 130 #endif /* ME */
 131         DESTROY_IF(this->public.backends);
 132         DESTROY_IF(this->public.socket);
 133
 134         /* rehook library logging, shutdown logging */
 135         dbg = dbg_old;
 136         DESTROY_IF(this->public.bus);
 137         this->public.file_loggers->destroy_offset(this->public.file_loggers,
 138                                                                                         offsetof(file_logger_t, destroy));
 139         this->public.sys_loggers->destroy_offset(this->public.sys_loggers,
 140                                                                                         offsetof(sys_logger_t, destroy));
 141         free(this);
 142 }
 143
 144 METHOD(daemon_t, keep_cap, void,
 145            private_daemon_t *this, u_int cap)
 146 {
 147 #ifdef CAPABILITIES_LIBCAP
 148         cap_set_flag(this->caps, CAP_EFFECTIVE, 1, &cap, CAP_SET);
 149         cap_set_flag(this->caps, CAP_INHERITABLE, 1, &cap, CAP_SET);
 150         cap_set_flag(this->caps, CAP_PERMITTED, 1, &cap, CAP_SET);
 151 #endif /* CAPABILITIES_LIBCAP */
 152 #ifdef CAPABILITIES_NATIVE
 153         int i = 0;
 154
 155         if (cap >= 32)
 156         {
 157                 i++;
 158                 cap -= 32;
 159         }
 160         this->caps[i].effective |= 1 << cap;
 161         this->caps[i].permitted |= 1 << cap;
 162         this->caps[i].inheritable |= 1 << cap;
 163 #endif /* CAPABILITIES_NATIVE */
 164 }
 165
 166 METHOD(daemon_t, drop_capabilities, bool,
 167            private_daemon_t *this)
 168 {
 169 #ifdef CAPABILITIES_LIBCAP
 170         if (cap_set_proc(this->caps) != 0)
 171         {
 172                 return FALSE;
 173         }
 174 #endif /* CAPABILITIES_LIBCAP */
 175 #ifdef CAPABILITIES_NATIVE
 176         struct __user_cap_header_struct header = {
 177 #if defined(_LINUX_CAPABILITY_VERSION_3)
 178                 .version = _LINUX_CAPABILITY_VERSION_3,
 179 #elif defined(_LINUX_CAPABILITY_VERSION_2)
 180                 .version = _LINUX_CAPABILITY_VERSION_2,
 181 #elif defined(_LINUX_CAPABILITY_VERSION_1)
 182                 .version = _LINUX_CAPABILITY_VERSION_1,
 183 #else
 184                 .version = _LINUX_CAPABILITY_VERSION,
 185 #endif
 186         };
 187         if (capset(&header, this->caps) != 0)
 188         {
 189                 return FALSE;
 190         }
 191 #endif /* CAPABILITIES_NATIVE */
 192         return TRUE;
 193 }
 194
 195 METHOD(daemon_t, start, void,
 196            private_daemon_t *this)
 197 {
 198         /* start the engine, go multithreaded */
 199         lib->processor->set_threads(lib->processor,
 200                                                 lib->settings->get_int(lib->settings, "charon.threads",
 201                                                                                            DEFAULT_THREADS));
 202 }
 203
 204 /**
 205  * Log loaded plugins
 206  */
 207 static void print_plugins()
 208 {
 209         char buf[512];
 210         int len = 0;
 211         enumerator_t *enumerator;
 212         plugin_t *plugin;
 213
 214         buf[0] = '\0';
 215         enumerator = lib->plugins->create_plugin_enumerator(lib->plugins);
 216         while (len < sizeof(buf) && enumerator->enumerate(enumerator, &plugin))
 217         {
 218                 len += snprintf(&buf[len], sizeof(buf)-len, "%s ",
 219                                                 plugin->get_name(plugin));
 220         }
 221         enumerator->destroy(enumerator);
 222         DBG1(DBG_DMN, "loaded plugins: %s", buf);
 223 }
 224
 225 METHOD(daemon_t, initialize, bool,
 226         private_daemon_t *this)
 227 {
 228         DBG1(DBG_DMN, "Starting IKEv2 charon daemon (strongSwan "VERSION")");
 229
 230         if (lib->integrity)
 231         {
 232                 DBG1(DBG_DMN, "integrity tests enabled:");
 233                 DBG1(DBG_DMN, "lib    'libstrongswan': passed file and segment integrity tests");
 234                 DBG1(DBG_DMN, "lib    'libhydra': passed file and segment integrity tests");
 235                 DBG1(DBG_DMN, "lib    'libcharon': passed file and segment integrity tests");
 236                 DBG1(DBG_DMN, "daemon 'charon': passed file integrity test");
 237         }
 238
 239         /* load plugins, further infrastructure may need it */
 240         if (!lib->plugins->load(lib->plugins, NULL,
 241                         lib->settings->get_str(lib->settings, "charon.load", PLUGINS)))
 242         {
 243                 return FALSE;
 244         }
 245
 246         print_plugins();
 247
 248         this->public.ike_sa_manager = ike_sa_manager_create();
 249         if (this->public.ike_sa_manager == NULL)
 250         {
 251                 return FALSE;
 252         }
 253         this->public.sender = sender_create();
 254         this->public.receiver = receiver_create();
 255         if (this->public.receiver == NULL)
 256         {
 257                 return FALSE;
 258         }
 259
 260         /* Queue start_action job */
 261         lib->processor->queue_job(lib->processor, (job_t*)start_action_job_create());
 262
 263 #ifdef ME
 264         this->public.connect_manager = connect_manager_create();
 265         if (this->public.connect_manager == NULL)
 266         {
 267                 return FALSE;
 268         }
 269         this->public.mediation_manager = mediation_manager_create();
 270 #endif /* ME */
 271
 272         return TRUE;
 273 }
 274
 275 /**
 276  * Create the daemon.
 277  */
 278 private_daemon_t *daemon_create()
 279 {
 280         private_daemon_t *this;
 281
 282         INIT(this,
 283                 .public = {
 284                         .keep_cap = _keep_cap,
 285                         .drop_capabilities = _drop_capabilities,
 286                         .initialize = _initialize,
 287                         .start = _start,
 288                         .bus = bus_create(),
 289                         .file_loggers = linked_list_create(),
 290                         .sys_loggers = linked_list_create(),
 291                 },
 292         );
 293         charon = &this->public;
 294         this->public.controller = controller_create();
 295         this->public.eap = eap_manager_create();
 296         this->public.tnccs = tnccs_manager_create();
 297         this->public.backends = backend_manager_create();
 298         this->public.socket = socket_manager_create();
 299         this->public.traps = trap_manager_create();
 300         this->public.shunts = shunt_manager_create();
 301         this->kernel_handler = kernel_handler_create();
 302
 303 #ifdef CAPABILITIES
 304 #ifdef CAPABILITIES_LIBCAP
 305         this->caps = cap_init();
 306 #endif /* CAPABILITIES_LIBCAP */
 307         keep_cap(this, CAP_NET_ADMIN);
 308         if (lib->leak_detective)
 309         {
 310                 keep_cap(this, CAP_SYS_NICE);
 311         }
 312 #endif /* CAPABILITIES */
 313
 314         return this;
 315 }
 316
 317 /**
 318  * Described in header.
 319  */
 320 void libcharon_deinit()
 321 {
 322         destroy((private_daemon_t*)charon);
 323         charon = NULL;
 324 }
 325
 326 /**
 327  * Described in header.
 328  */
 329 bool libcharon_init()
 330 {
 331         daemon_create();
 332
 333         /* for uncritical pseudo random numbers */
 334         srandom(time(NULL) + getpid());
 335
 336         /* set up hook to log dbg message in library via charons message bus */
 337         dbg_old = dbg;
 338         dbg = dbg_bus;
 339
 340         lib->printf_hook->add_handler(lib->printf_hook, 'P',
 341                                                                   proposal_printf_hook,
 342                                                                   PRINTF_HOOK_ARGTYPE_POINTER,
 343                                                                   PRINTF_HOOK_ARGTYPE_END);
 344
 345         if (lib->integrity &&
 346                 !lib->integrity->check(lib->integrity, "libcharon", libcharon_init))
 347         {
 348                 dbg(DBG_DMN, 1, "integrity check of libcharon failed");
 349                 return FALSE;
 350         }
 351
 352         return TRUE;
 353 }