src/misc-progs/ipsecctrl.c

   1 /*
   2  *
   3  * File originally from the Smoothwall project
   4  * (c) 2001 Smoothwall Team
   5  *
   6  */
   7
   8 #include "libsmooth.h"
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15 #include <signal.h>
  16
  17 #include "setuid.h"
  18 #include "netutil.h"
  19
  20 /*
  21     This module is responsible for start stop of the vpn system.
  22
  23     1) it allows AH & ESP to get in from interface where a vpn is mounted
  24         The NAT traversal is used on the udp 4500 port.
  25
  26     2) it starts the ipsec daemon
  27         The RED interface is a problem because it can be up or down a startup.
  28         Then, the state change and it must not affect other VPN mounted on
  29         other interface.
  30         Unfortunatly, openswan 1 cannot do that correctly. It cannot use an
  31         interface without restarting everything.
  32
  33 */
  34
  35 void usage() {
  36         fprintf (stderr, "Usage:\n");
  37         fprintf (stderr, "\tipsecctrl S [connectionkey]\n");
  38         fprintf (stderr, "\tipsecctrl D [connectionkey]\n");
  39         fprintf (stderr, "\tipsecctrl R\n");
  40         fprintf (stderr, "\tipsecctrl I\n");
  41         fprintf (stderr, "\t\tS : Start/Restart Connection\n");
  42         fprintf (stderr, "\t\tD : Stop Connection\n");
  43         fprintf (stderr, "\t\tR : Reload Certificates and Secrets\n");
  44         fprintf (stderr, "\t\tI : Print Statusinfo\n");
  45 }
  46
  47 static void ipsec_reload() {
  48         /* Re-read all configuration files and secrets and
  49          * reload the daemon (#10339).
  50          */
  51         safe_system("/usr/sbin/ipsec rereadall >/dev/null 2>&1");
  52         safe_system("/usr/sbin/ipsec reload >/dev/null 2>&1");
  53 }
  54
  55 /*
  56         ACCEPT the ipsec protocol ah, esp & udp (for nat traversal) on the specified interface
  57 */
  58 void open_physical (char *interface, int nat_traversal_port) {
  59         char str[STRING_SIZE];
  60
  61         // IKE
  62         sprintf(str, "/sbin/iptables --wait -D IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT >/dev/null 2>&1", interface);
  63         safe_system(str);
  64         sprintf(str, "/sbin/iptables --wait -A IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT", interface);
  65         safe_system(str);
  66
  67         if (! nat_traversal_port)
  68             return;
  69
  70         sprintf(str, "/sbin/iptables --wait -D IPSECINPUT -p udp -i %s --dport %i -j ACCEPT >/dev/null 2>&1", interface, nat_traversal_port);
  71         safe_system(str);
  72         sprintf(str, "/sbin/iptables --wait -A IPSECINPUT -p udp -i %s --dport %i -j ACCEPT", interface, nat_traversal_port);
  73         safe_system(str);
  74 }
  75
  76 void ipsec_norules() {
  77         /* clear input rules */
  78         safe_system("/sbin/iptables --wait -F IPSECINPUT");
  79         safe_system("/sbin/iptables --wait -F IPSECFORWARD");
  80         safe_system("/sbin/iptables --wait -F IPSECOUTPUT");
  81 }
  82
  83 /*
  84  return values from the vpn config file or false if not 'on'
  85 */
  86 int decode_line (char *s,
  87                 char **key,
  88                 char **name,
  89                 char **type
  90                 ) {
  91         int count = 0;
  92         *key = NULL;
  93         *name = NULL;
  94         *type = NULL;
  95
  96         if (s[strlen(s) - 1] == '\n')
  97                 s[strlen(s) - 1] = '\0';
  98
  99         char *result = strsep(&s, ",");
 100         while (result) {
 101                 if (count == 0)
 102                         *key = result;
 103                 if ((count == 1) && strcmp(result, "on") != 0)
 104                         return 0;       // a disabled line
 105                 if (count == 2)
 106                         *name = result;
 107                 if (count == 4)
 108                         *type = result;
 109                 count++;
 110                 result = strsep(&s, ",");
 111         }
 112
 113         // check other syntax
 114         if (! *name)
 115             return 0;
 116
 117         if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) {
 118                 fprintf(stderr, "Bad connection name: %s\n", *name);
 119                 return 0;
 120         }
 121
 122         if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) {
 123                 fprintf(stderr, "Bad connection type: %s\n", *type);
 124                 return 0;
 125         }
 126
 127         //it's a valid & active line
 128         return 1;
 129 }
 130
 131 /*
 132     issue ipsec commmands to turn on connection 'name'
 133 */
 134 void turn_connection_on(char *name, char *type) {
 135         /*
 136          * To bring up a connection, we need to reload the configuration
 137          * and issue ipsec up afterwards. To make sure the connection
 138          * is not established from the start, we bring it down in advance.
 139          */
 140         char command[STRING_SIZE];
 141
 142         // Bring down the connection (if established).
 143         snprintf(command, STRING_SIZE - 1,
 144                 "/usr/sbin/ipsec down %s >/dev/null", name);
 145         safe_system(command);
 146
 147         // Reload the IPsec block chain
 148         safe_system("/usr/lib/firewall/ipsec-block >/dev/null");
 149
 150         // Reload the configuration into the daemon (#10339).
 151         ipsec_reload();
 152
 153         // Bring the connection up again.
 154         snprintf(command, STRING_SIZE - 1,
 155                 "/usr/sbin/ipsec up %s >/dev/null", name);
 156         safe_system(command);
 157 }
 158
 159 /*
 160     issue ipsec commmands to turn off connection 'name'
 161 */
 162 void turn_connection_off (char *name) {
 163         /*
 164          * To turn off a connection, all SAs must be turned down.
 165          * After that, the configuration must be reloaded.
 166          */
 167         char command[STRING_SIZE];
 168
 169         // Bring down the connection.
 170         snprintf(command, STRING_SIZE - 1,
 171                 "/usr/sbin/ipsec down %s >/dev/null", name);
 172         safe_system(command);
 173
 174         // Reload, so the connection is dropped.
 175         ipsec_reload();
 176 }
 177
 178 int main(int argc, char *argv[]) {
 179         char configtype[STRING_SIZE];
 180         char redtype[STRING_SIZE] = "";
 181         struct keyvalue *kv = NULL;
 182
 183         if (argc < 2) {
 184                 usage();
 185                 exit(1);
 186         }
 187         if (!(initsetuid()))
 188                 exit(1);
 189
 190  FILE *file = NULL;
 191
 192
 193         if (strcmp(argv[1], "I") == 0) {
 194                 safe_system("/usr/sbin/ipsec status");
 195                 exit(0);
 196         }
 197
 198         if (strcmp(argv[1], "R") == 0) {
 199                 ipsec_reload();
 200                 exit(0);
 201         }
 202
 203         /* FIXME: workaround for pclose() issue - still no real idea why
 204          * this is happening */
 205         signal(SIGCHLD, SIG_DFL);
 206
 207         /* handle operations that doesn't need start the ipsec system */
 208         if (argc == 2) {
 209                 if (strcmp(argv[1], "D") == 0) {
 210                         safe_system("/usr/sbin/ipsec stop >/dev/null 2>&1");
 211                         ipsec_norules();
 212                         exit(0);
 213                 }
 214         }
 215
 216         /* read vpn config */
 217         kv=initkeyvalues();
 218         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 219         {
 220                 fprintf(stderr, "Cannot read vpn settings\n");
 221                 exit(1);
 222         }
 223
 224         /* check is the vpn system is enabled */
 225         {
 226             char s[STRING_SIZE];
 227             findkey(kv, "ENABLED", s);
 228             freekeyvalues(kv);
 229             if (strcmp (s, "on") != 0)
 230                 exit(0);
 231         }
 232
 233         /* read interface settings */
 234         kv=initkeyvalues();
 235         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 236         {
 237                 fprintf(stderr, "Cannot read ethernet settings\n");
 238                 exit(1);
 239         }
 240         if (!findkey(kv, "CONFIG_TYPE", configtype))
 241         {
 242                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 243                 exit(1);
 244         }
 245         findkey(kv, "RED_TYPE", redtype);
 246
 247
 248         /* Loop through the config file to find physical interface that will accept IPSEC */
 249         int enable_red=0;       // states 0: not used
 250         int enable_green=0;     //        1: error condition
 251         int enable_orange=0;    //        2: good
 252         int enable_blue=0;
 253         char if_red[STRING_SIZE] = "";
 254         char if_green[STRING_SIZE] = "";
 255         char if_orange[STRING_SIZE] = "";
 256         char if_blue[STRING_SIZE] = "";
 257         char s[STRING_SIZE];
 258
 259         // when RED is up, find interface name in special file
 260         FILE *ifacefile = NULL;
 261         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 262                 if (fgets(if_red, STRING_SIZE, ifacefile)) {
 263                         if (if_red[strlen(if_red) - 1] == '\n')
 264                                 if_red[strlen(if_red) - 1] = '\0';
 265                 }
 266                 fclose (ifacefile);
 267
 268                 if (VALID_DEVICE(if_red))
 269                         enable_red++;
 270         }
 271
 272         // Check if GREEN is enabled.
 273         findkey(kv, "GREEN_DEV", if_green);
 274         if (VALID_DEVICE(if_green))
 275                 enable_green++;
 276
 277         // Check if ORANGE is enabled.
 278         findkey(kv, "ORANGE_DEV", if_orange);
 279         if (VALID_DEVICE(if_orange))
 280                 enable_orange++;
 281
 282         // Check if BLUE is enabled.
 283         findkey(kv, "BLUE_DEV", if_blue);
 284         if (VALID_DEVICE(if_blue))
 285                 enable_blue++;
 286
 287         freekeyvalues(kv);
 288
 289         // exit if nothing to do
 290         if ((enable_red+enable_green+enable_orange+enable_blue) == 0)
 291             exit(0);
 292
 293         // open needed ports
 294         if (enable_red > 0)
 295                 open_physical(if_red, 4500);
 296
 297         if (enable_green > 0)
 298                 open_physical(if_green, 4500);
 299
 300         if (enable_orange > 0)
 301                 open_physical(if_orange, 4500);
 302
 303         if (enable_blue > 0)
 304                 open_physical(if_blue, 4500);
 305
 306         // start the system
 307         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 308                 safe_system("/usr/lib/firewall/ipsec-block >/dev/null");
 309                 safe_system("/usr/sbin/ipsec restart >/dev/null");
 310                 exit(0);
 311         }
 312
 313         // it is a selective start or stop
 314         // second param is only a number 'key'
 315         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 316                 fprintf(stderr, "Bad arg: %s\n", argv[2]);
 317                 usage();
 318                 exit(1);
 319         }
 320
 321         // search the vpn pointed by 'key'
 322         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 323                 fprintf(stderr, "Couldn't open vpn settings file");
 324                 exit(1);
 325         }
 326         while (fgets(s, STRING_SIZE, file) != NULL) {
 327                 char *key;
 328                 char *name;
 329                 char *type;
 330                 if (!decode_line(s,&key,&name,&type))
 331                         continue;
 332
 333                 // is it the 'key' requested ?
 334                 if (strcmp(argv[2], key) != 0)
 335                         continue;
 336
 337                 // Start or Delete this Connection
 338                 if (strcmp(argv[1], "S") == 0)
 339                         turn_connection_on (name, type);
 340                 else if (strcmp(argv[1], "D") == 0)
 341                         turn_connection_off (name);
 342                 else {
 343                         fprintf(stderr, "Bad command\n");
 344                         exit(1);
 345                 }
 346         }
 347         fclose(file);
 348
 349         return 0;
 350 }