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         // GRE ???
  62 //        sprintf(str, "/sbin/iptables -A " phystable " -p 47  -i %s -j ACCEPT", interface);
  63 //        safe_system(str);
  64         // ESP
  65 //        sprintf(str, "/sbin/iptables -A " phystable " -p 50  -i %s -j ACCEPT", interface);
  66 //        safe_system(str);
  67         // AH
  68 //        sprintf(str, "/sbin/iptables -A " phystable " -p 51  -i %s -j ACCEPT", interface);
  69 //        safe_system(str);
  70         // IKE
  71
  72         sprintf(str, "/sbin/iptables -D IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT >/dev/null 2>&1", interface);
  73         safe_system(str);
  74         sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT", interface);
  75         safe_system(str);
  76
  77         if (! nat_traversal_port)
  78             return;
  79
  80         sprintf(str, "/sbin/iptables -D IPSECINPUT -p udp -i %s --dport %i -j ACCEPT >/dev/null 2>&1", interface, nat_traversal_port);
  81         safe_system(str);
  82         sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --dport %i -j ACCEPT", interface, nat_traversal_port);
  83         safe_system(str);
  84 }
  85
  86 void ipsec_norules() {
  87         /* clear input rules */
  88         safe_system("/sbin/iptables -F IPSECINPUT");
  89         safe_system("/sbin/iptables -F IPSECFORWARD");
  90         safe_system("/sbin/iptables -F IPSECOUTPUT");
  91 }
  92
  93 /*
  94  return values from the vpn config file or false if not 'on'
  95 */
  96 int decode_line (char *s,
  97                 char **key,
  98                 char **name,
  99                 char **type
 100                 ) {
 101         int count = 0;
 102         *key = NULL;
 103         *name = NULL;
 104         *type = NULL;
 105
 106         if (s[strlen(s) - 1] == '\n')
 107                 s[strlen(s) - 1] = '\0';
 108
 109         char *result = strsep(&s, ",");
 110         while (result) {
 111                 if (count == 0)
 112                         *key = result;
 113                 if ((count == 1) && strcmp(result, "on") != 0)
 114                         return 0;       // a disabled line
 115                 if (count == 2)
 116                         *name = result;
 117                 if (count == 4)
 118                         *type = result;
 119                 count++;
 120                 result = strsep(&s, ",");
 121         }
 122
 123         // check other syntax
 124         if (! *name)
 125             return 0;
 126
 127         if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) {
 128                 fprintf(stderr, "Bad connection name: %s\n", *name);
 129                 return 0;
 130         }
 131
 132         if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) {
 133                 fprintf(stderr, "Bad connection type: %s\n", *type);
 134                 return 0;
 135         }
 136
 137         //it's a valid & active line
 138         return 1;
 139 }
 140
 141 /*
 142     issue ipsec commmands to turn on connection 'name'
 143 */
 144 void turn_connection_on(char *name, char *type) {
 145         /*
 146          * To bring up a connection, we need to reload the configuration
 147          * and issue ipsec up afterwards. To make sure the connection
 148          * is not established from the start, we bring it down in advance.
 149          */
 150         char command[STRING_SIZE];
 151
 152         // Bring down the connection (if established).
 153         snprintf(command, STRING_SIZE - 1,
 154                 "/usr/sbin/ipsec down %s >/dev/null", name);
 155         safe_system(command);
 156
 157         // Reload the configuration into the daemon (#10339).
 158         ipsec_reload();
 159
 160         // Bring the connection up again.
 161         snprintf(command, STRING_SIZE - 1,
 162                 "/usr/sbin/ipsec up %s >/dev/null", name);
 163         safe_system(command);
 164 }
 165
 166 /*
 167     issue ipsec commmands to turn off connection 'name'
 168 */
 169 void turn_connection_off (char *name) {
 170         /*
 171          * To turn off a connection, all SAs must be turned down.
 172          * After that, the configuration must be reloaded.
 173          */
 174         char command[STRING_SIZE];
 175
 176         // Bring down the connection.
 177         snprintf(command, STRING_SIZE - 1,
 178                 "/usr/sbin/ipsec down %s >/dev/null", name);
 179         safe_system(command);
 180
 181         // Reload, so the connection is dropped.
 182         ipsec_reload();
 183 }
 184
 185 int main(int argc, char *argv[]) {
 186         char configtype[STRING_SIZE];
 187         char redtype[STRING_SIZE] = "";
 188         struct keyvalue *kv = NULL;
 189
 190         if (argc < 2) {
 191                 usage();
 192                 exit(1);
 193         }
 194         if (!(initsetuid()))
 195                 exit(1);
 196
 197  FILE *file = NULL;
 198
 199
 200         if (strcmp(argv[1], "I") == 0) {
 201                 safe_system("/usr/sbin/ipsec status");
 202                 exit(0);
 203         }
 204
 205         if (strcmp(argv[1], "R") == 0) {
 206                 ipsec_reload();
 207                 exit(0);
 208         }
 209
 210         /* FIXME: workaround for pclose() issue - still no real idea why
 211          * this is happening */
 212         signal(SIGCHLD, SIG_DFL);
 213
 214         /* handle operations that doesn't need start the ipsec system */
 215         if (argc == 2) {
 216                 if (strcmp(argv[1], "D") == 0) {
 217                         safe_system("/usr/sbin/ipsec stop >/dev/null 2>&1");
 218                         ipsec_norules();
 219                         exit(0);
 220                 }
 221         }
 222
 223         /* read vpn config */
 224         kv=initkeyvalues();
 225         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 226         {
 227                 fprintf(stderr, "Cannot read vpn settings\n");
 228                 exit(1);
 229         }
 230
 231         /* check is the vpn system is enabled */
 232         {
 233             char s[STRING_SIZE];
 234             findkey(kv, "ENABLED", s);
 235             freekeyvalues(kv);
 236             if (strcmp (s, "on") != 0)
 237                 exit(0);
 238         }
 239
 240         /* read interface settings */
 241         kv=initkeyvalues();
 242         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 243         {
 244                 fprintf(stderr, "Cannot read ethernet settings\n");
 245                 exit(1);
 246         }
 247         if (!findkey(kv, "CONFIG_TYPE", configtype))
 248         {
 249                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 250                 exit(1);
 251         }
 252         findkey(kv, "RED_TYPE", redtype);
 253
 254
 255         /* Loop through the config file to find physical interface that will accept IPSEC */
 256         int enable_red=0;       // states 0: not used
 257         int enable_green=0;     //        1: error condition
 258         int enable_orange=0;    //        2: good
 259         int enable_blue=0;
 260         char if_red[STRING_SIZE] = "";
 261         char if_green[STRING_SIZE] = "";
 262         char if_orange[STRING_SIZE] = "";
 263         char if_blue[STRING_SIZE] = "";
 264         char s[STRING_SIZE];
 265
 266         // when RED is up, find interface name in special file
 267         FILE *ifacefile = NULL;
 268         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 269                 if (fgets(if_red, STRING_SIZE, ifacefile)) {
 270                         if (if_red[strlen(if_red) - 1] == '\n')
 271                                 if_red[strlen(if_red) - 1] = '\0';
 272                 }
 273                 fclose (ifacefile);
 274
 275                 if (VALID_DEVICE(if_red))
 276                         enable_red++;
 277         }
 278
 279         // Check if GREEN is enabled.
 280         findkey(kv, "GREEN_DEV", if_green);
 281         if (VALID_DEVICE(if_green))
 282                 enable_green++;
 283
 284         // Check if ORANGE is enabled.
 285         findkey(kv, "ORANGE_DEV", if_orange);
 286         if (VALID_DEVICE(if_orange))
 287                 enable_orange++;
 288
 289         // Check if BLUE is enabled.
 290         findkey(kv, "BLUE_DEV", if_blue);
 291         if (VALID_DEVICE(if_blue))
 292                 enable_blue++;
 293
 294         freekeyvalues(kv);
 295
 296         // exit if nothing to do
 297         if ((enable_red+enable_green+enable_orange+enable_blue) == 0)
 298             exit(0);
 299
 300         // open needed ports
 301         if (enable_red > 0)
 302                 open_physical(if_red, 4500);
 303
 304         if (enable_green > 0)
 305                 open_physical(if_green, 4500);
 306
 307         if (enable_orange > 0)
 308                 open_physical(if_orange, 4500);
 309
 310         if (enable_blue > 0)
 311                 open_physical(if_blue, 4500);
 312
 313         // start the system
 314         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 315                 safe_system("/usr/sbin/ipsec restart >/dev/null");
 316                 exit(0);
 317         }
 318
 319         // it is a selective start or stop
 320         // second param is only a number 'key'
 321         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 322                 fprintf(stderr, "Bad arg: %s\n", argv[2]);
 323                 usage();
 324                 exit(1);
 325         }
 326
 327         // search the vpn pointed by 'key'
 328         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 329                 fprintf(stderr, "Couldn't open vpn settings file");
 330                 exit(1);
 331         }
 332         while (fgets(s, STRING_SIZE, file) != NULL) {
 333                 char *key;
 334                 char *name;
 335                 char *type;
 336                 if (!decode_line(s,&key,&name,&type))
 337                         continue;
 338
 339                 // is it the 'key' requested ?
 340                 if (strcmp(argv[2], key) != 0)
 341                         continue;
 342
 343                 // Start or Delete this Connection
 344                 if (strcmp(argv[1], "S") == 0)
 345                         turn_connection_on (name, type);
 346                 else if (strcmp(argv[1], "D") == 0)
 347                         turn_connection_off (name);
 348                 else {
 349                         fprintf(stderr, "Bad command\n");
 350                         exit(1);
 351                 }
 352         }
 353         fclose(file);
 354
 355         return 0;
 356 }