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