programs/starter/klips.c

   1 /* strongSwan KLIPS starter
   2  * Copyright (C) 2001-2002 Mathieu Lafon - Arkoon Network Security
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * RCSID $Id: klips.c,v 1.8 2006/02/15 18:33:57 as Exp $
  15  */
  16
  17 #include <sys/types.h>
  18 #include <sys/stat.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21
  22 #include <freeswan.h>
  23
  24 #include "../pluto/constants.h"
  25 #include "../pluto/defs.h"
  26 #include "../pluto/log.h"
  27
  28 #include "confread.h"
  29 #include "klips.h"
  30 #include "files.h"
  31 #include "exec.h"
  32
  33 static int _klips_module_loaded = 0;
  34
  35 bool
  36 starter_klips_init(void)
  37 {
  38     struct stat stb;
  39
  40     if (stat(PROC_IPSECVERSION, &stb) != 0)
  41     {
  42         if (stat(PROC_MODULES, &stb) == 0)
  43         {
  44             unsetenv("MODPATH");
  45             unsetenv("MODULECONF");
  46             system("depmod -a >/dev/null 2>&1");
  47             system("modprobe -qv ipsec");
  48         }
  49         if (stat(PROC_IPSECVERSION, &stb) == 0)
  50         {
  51             _klips_module_loaded = 1;
  52         }
  53         else
  54         {
  55             DBG(DBG_CONTROL,
  56                 DBG_log("kernel appears to lack KLIPS")
  57             )
  58             return FALSE;
  59         }
  60     }
  61
  62     /* make sure that all available crypto algorithms are loaded */
  63     if (stat(PROC_MODULES, &stb) == 0)
  64     {
  65         system("modprobe -qv ipsec_aes");
  66         system("modprobe -qv ipsec_serpent");
  67         system("modprobe -qv ipsec_twofish");
  68         system("modprobe -qv ipsec_blowfish");
  69         system("modprobe -qv ipsec_sha2");
  70     }
  71
  72     starter_klips_clear();
  73
  74     DBG(DBG_CONTROL,
  75         DBG_log("Found KLIPS IPsec stack")
  76     )
  77     return TRUE;
  78 }
  79
  80 static void
  81 _sysflags (char *name, int value)
  82 {
  83     int res = starter_exec("echo %d >%s/%s 2>/dev/null"
  84                         , value? 1 : 0, PROC_SYSFLAGS, name);
  85
  86     if (res)
  87         plog("can't set sysflag %s to %d", name, value? 1 : 0);
  88 }
  89
  90 void
  91 starter_klips_set_config(starter_config_t *cfg)
  92 {
  93     char **l;
  94
  95     _sysflags("icmp", cfg->setup.fragicmp);
  96     _sysflags("inbound_policy_check", 1);
  97     /* _sysflags("no_eroute_pass", 0); */
  98     /* _sysflags("opportunistic", 0);  */
  99     _sysflags("tos", cfg->setup.hidetos);
 100
 101     starter_exec("%s/klipsdebug --none", IPSEC_EXECDIR);
 102     for (l = cfg->setup.klipsdebug; l && *l; l++)
 103     {
 104         if ((streq(*l, "none")) || (streq(*l, "all")))
 105             starter_exec("%s/klipsdebug --%s", IPSEC_EXECDIR, *l);
 106         else
 107             starter_exec("%s/klipsdebug --set %s", IPSEC_EXECDIR, *l);
 108     }
 109
 110     starter_exec("%s/eroute --del --eraf inet --src 0/0 --dst 0/0 2>/dev/null"
 111                 , IPSEC_EXECDIR);
 112     starter_exec("%s/eroute --label packetdefault --replace --eraf inet "
 113                  "--src 0/0 --dst 0/0 --said %%%s", IPSEC_EXECDIR
 114                 , cfg->setup.packetdefault ? cfg->setup.packetdefault : "drop");
 115 }
 116
 117 void
 118 starter_klips_clear(void)
 119 {
 120     system(IPSEC_EXECDIR"/eroute --clear");
 121     system(IPSEC_EXECDIR"/spi --clear");
 122     system(IPSEC_EXECDIR"/klipsdebug --none");
 123 }
 124
 125 void
 126 starter_klips_cleanup(void)
 127 {
 128     starter_klips_clear();
 129     if (_klips_module_loaded)
 130     {
 131         system("rmmod ipsec");
 132         _klips_module_loaded = 0;
 133     }
 134 }