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 #ifdef ME
 115         DESTROY_IF(this->public.connect_manager);
 116         DESTROY_IF(this->public.mediation_manager);
 117 #endif /* ME */
 118         /* make sure the cache is clear before unloading plugins */
 119         lib->credmgr->flush_cache(lib->credmgr, CERT_ANY);
 120         /* unload plugins to release threads */
 121         lib->plugins->unload(lib->plugins);
 122 #ifdef CAPABILITIES_LIBCAP
 123         cap_free(this->caps);
 124 #endif /* CAPABILITIES_LIBCAP */
 125         DESTROY_IF(this->kernel_handler);
 126         DESTROY_IF(this->public.traps);
 127         DESTROY_IF(this->public.shunts);
 128         DESTROY_IF(this->public.ike_sa_manager);
 129         DESTROY_IF(this->public.controller);
 130         DESTROY_IF(this->public.eap);
 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 METHOD(daemon_t, initialize, bool,
 205         private_daemon_t *this)
 206 {
 207         DBG1(DBG_DMN, "Starting IKEv2 charon daemon (strongSwan "VERSION")");
 208
 209         if (lib->integrity)
 210         {
 211                 DBG1(DBG_DMN, "integrity tests enabled:");
 212                 DBG1(DBG_DMN, "lib    'libstrongswan': passed file and segment integrity tests");
 213                 DBG1(DBG_DMN, "lib    'libhydra': passed file and segment integrity tests");
 214                 DBG1(DBG_DMN, "lib    'libcharon': passed file and segment integrity tests");
 215                 DBG1(DBG_DMN, "daemon 'charon': passed file integrity test");
 216         }
 217
 218         /* load plugins, further infrastructure may need it */
 219         if (!lib->plugins->load(lib->plugins, NULL,
 220                         lib->settings->get_str(lib->settings, "charon.load", PLUGINS)))
 221         {
 222                 return FALSE;
 223         }
 224         DBG1(DBG_DMN, "loaded plugins: %s",
 225                  lib->plugins->loaded_plugins(lib->plugins));
 226
 227         this->public.ike_sa_manager = ike_sa_manager_create();
 228         if (this->public.ike_sa_manager == NULL)
 229         {
 230                 return FALSE;
 231         }
 232         this->public.sender = sender_create();
 233         this->public.receiver = receiver_create();
 234         if (this->public.receiver == NULL)
 235         {
 236                 return FALSE;
 237         }
 238
 239         /* Queue start_action job */
 240         lib->processor->queue_job(lib->processor, (job_t*)start_action_job_create());
 241
 242 #ifdef ME
 243         this->public.connect_manager = connect_manager_create();
 244         if (this->public.connect_manager == NULL)
 245         {
 246                 return FALSE;
 247         }
 248         this->public.mediation_manager = mediation_manager_create();
 249 #endif /* ME */
 250
 251         return TRUE;
 252 }
 253
 254 /**
 255  * Create the daemon.
 256  */
 257 private_daemon_t *daemon_create()
 258 {
 259         private_daemon_t *this;
 260
 261         INIT(this,
 262                 .public = {
 263                         .keep_cap = _keep_cap,
 264                         .drop_capabilities = _drop_capabilities,
 265                         .initialize = _initialize,
 266                         .start = _start,
 267                         .bus = bus_create(),
 268                         .file_loggers = linked_list_create(),
 269                         .sys_loggers = linked_list_create(),
 270                 },
 271         );
 272         charon = &this->public;
 273         this->public.controller = controller_create();
 274         this->public.eap = eap_manager_create();
 275         this->public.backends = backend_manager_create();
 276         this->public.socket = socket_manager_create();
 277         this->public.traps = trap_manager_create();
 278         this->public.shunts = shunt_manager_create();
 279         this->kernel_handler = kernel_handler_create();
 280
 281 #ifdef CAPABILITIES
 282 #ifdef CAPABILITIES_LIBCAP
 283         this->caps = cap_init();
 284 #endif /* CAPABILITIES_LIBCAP */
 285         keep_cap(this, CAP_NET_ADMIN);
 286         if (lib->leak_detective)
 287         {
 288                 keep_cap(this, CAP_SYS_NICE);
 289         }
 290 #endif /* CAPABILITIES */
 291
 292         return this;
 293 }
 294
 295 /**
 296  * Described in header.
 297  */
 298 void libcharon_deinit()
 299 {
 300         destroy((private_daemon_t*)charon);
 301         charon = NULL;
 302 }
 303
 304 /**
 305  * Described in header.
 306  */
 307 bool libcharon_init()
 308 {
 309         daemon_create();
 310
 311         /* for uncritical pseudo random numbers */
 312         srandom(time(NULL) + getpid());
 313
 314         /* set up hook to log dbg message in library via charons message bus */
 315         dbg_old = dbg;
 316         dbg = dbg_bus;
 317
 318         lib->printf_hook->add_handler(lib->printf_hook, 'P',
 319                                                                   proposal_printf_hook,
 320                                                                   PRINTF_HOOK_ARGTYPE_POINTER,
 321                                                                   PRINTF_HOOK_ARGTYPE_END);
 322
 323         if (lib->integrity &&
 324                 !lib->integrity->check(lib->integrity, "libcharon", libcharon_init))
 325         {
 326                 dbg(DBG_DMN, 1, "integrity check of libcharon failed");
 327                 return FALSE;
 328         }
 329
 330         return TRUE;
 331 }