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         // Reload the IPsec block chain
 178         safe_system("/usr/lib/firewall/ipsec-block >/dev/null");
 179 }
 180
 181 int main(int argc, char *argv[]) {
 182         char configtype[STRING_SIZE];
 183         char redtype[STRING_SIZE] = "";
 184         struct keyvalue *kv = NULL;
 185
 186         if (argc < 2) {
 187                 usage();
 188                 exit(1);
 189         }
 190         if (!(initsetuid()))
 191                 exit(1);
 192
 193  FILE *file = NULL;
 194
 195
 196         if (strcmp(argv[1], "I") == 0) {
 197                 safe_system("/usr/sbin/ipsec status");
 198                 exit(0);
 199         }
 200
 201         if (strcmp(argv[1], "R") == 0) {
 202                 ipsec_reload();
 203                 exit(0);
 204         }
 205
 206         /* FIXME: workaround for pclose() issue - still no real idea why
 207          * this is happening */
 208         signal(SIGCHLD, SIG_DFL);
 209
 210         /* handle operations that doesn't need start the ipsec system */
 211         if (argc == 2) {
 212                 if (strcmp(argv[1], "D") == 0) {
 213                         safe_system("/usr/sbin/ipsec stop >/dev/null 2>&1");
 214                         ipsec_norules();
 215                         exit(0);
 216                 }
 217         }
 218
 219         /* read vpn config */
 220         kv=initkeyvalues();
 221         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 222         {
 223                 fprintf(stderr, "Cannot read vpn settings\n");
 224                 exit(1);
 225         }
 226
 227         /* check is the vpn system is enabled */
 228         {
 229             char s[STRING_SIZE];
 230             findkey(kv, "ENABLED", s);
 231             freekeyvalues(kv);
 232             if (strcmp (s, "on") != 0)
 233                 exit(0);
 234         }
 235
 236         /* read interface settings */
 237         kv=initkeyvalues();
 238         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 239         {
 240                 fprintf(stderr, "Cannot read ethernet settings\n");
 241                 exit(1);
 242         }
 243         if (!findkey(kv, "CONFIG_TYPE", configtype))
 244         {
 245                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 246                 exit(1);
 247         }
 248         findkey(kv, "RED_TYPE", redtype);
 249
 250
 251         /* Loop through the config file to find physical interface that will accept IPSEC */
 252         int enable_red=0;       // states 0: not used
 253         int enable_green=0;     //        1: error condition
 254         int enable_orange=0;    //        2: good
 255         int enable_blue=0;
 256         char if_red[STRING_SIZE] = "";
 257         char if_green[STRING_SIZE] = "";
 258         char if_orange[STRING_SIZE] = "";
 259         char if_blue[STRING_SIZE] = "";
 260         char s[STRING_SIZE];
 261
 262         // when RED is up, find interface name in special file
 263         FILE *ifacefile = NULL;
 264         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 265                 if (fgets(if_red, STRING_SIZE, ifacefile)) {
 266                         if (if_red[strlen(if_red) - 1] == '\n')
 267                                 if_red[strlen(if_red) - 1] = '\0';
 268                 }
 269                 fclose (ifacefile);
 270
 271                 if (VALID_DEVICE(if_red))
 272                         enable_red++;
 273         }
 274
 275         // Check if GREEN is enabled.
 276         findkey(kv, "GREEN_DEV", if_green);
 277         if (VALID_DEVICE(if_green))
 278                 enable_green++;
 279
 280         // Check if ORANGE is enabled.
 281         findkey(kv, "ORANGE_DEV", if_orange);
 282         if (VALID_DEVICE(if_orange))
 283                 enable_orange++;
 284
 285         // Check if BLUE is enabled.
 286         findkey(kv, "BLUE_DEV", if_blue);
 287         if (VALID_DEVICE(if_blue))
 288                 enable_blue++;
 289
 290         freekeyvalues(kv);
 291
 292         // exit if nothing to do
 293         if ((enable_red+enable_green+enable_orange+enable_blue) == 0)
 294             exit(0);
 295
 296         // open needed ports
 297         if (enable_red > 0)
 298                 open_physical(if_red, 4500);
 299
 300         if (enable_green > 0)
 301                 open_physical(if_green, 4500);
 302
 303         if (enable_orange > 0)
 304                 open_physical(if_orange, 4500);
 305
 306         if (enable_blue > 0)
 307                 open_physical(if_blue, 4500);
 308
 309         // start the system
 310         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 311                 safe_system("/usr/lib/firewall/ipsec-block >/dev/null");
 312                 safe_system("/usr/sbin/ipsec restart >/dev/null");
 313                 exit(0);
 314         }
 315
 316         // it is a selective start or stop
 317         // second param is only a number 'key'
 318         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 319                 fprintf(stderr, "Bad arg: %s\n", argv[2]);
 320                 usage();
 321                 exit(1);
 322         }
 323
 324         // search the vpn pointed by 'key'
 325         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 326                 fprintf(stderr, "Couldn't open vpn settings file");
 327                 exit(1);
 328         }
 329         while (fgets(s, STRING_SIZE, file) != NULL) {
 330                 char *key;
 331                 char *name;
 332                 char *type;
 333                 if (!decode_line(s,&key,&name,&type))
 334                         continue;
 335
 336                 // is it the 'key' requested ?
 337                 if (strcmp(argv[2], key) != 0)
 338                         continue;
 339
 340                 // Start or Delete this Connection
 341                 if (strcmp(argv[1], "S") == 0)
 342                         turn_connection_on (name, type);
 343                 else if (strcmp(argv[1], "D") == 0)
 344                         turn_connection_off (name);
 345                 else {
 346                         fprintf(stderr, "Bad command\n");
 347                         exit(1);
 348                 }
 349         }
 350         fclose(file);
 351
 352         return 0;
 353 }