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 #include "setuid.h"
  17
  18 /*
  19     This module is responsible for start stop of the vpn system.
  20
  21     1) it allows AH & ESP to get in from interface where a vpn is mounted
  22         The NAT traversal is used on the udp 4500 port.
  23
  24     2) it starts the ipsec daemon
  25         The RED interface is a problem because it can be up or down a startup.
  26         Then, the state change and it must not affect other VPN mounted on
  27         other interface.
  28         Unfortunatly, openswan 1 cannot do that correctly. It cannot use an
  29         interface without restarting everything.
  30
  31 */
  32
  33 void usage() {
  34         fprintf (stderr, "Usage:\n");
  35         fprintf (stderr, "\tipsecctrl S [connectionkey]\n");
  36         fprintf (stderr, "\tipsecctrl D [connectionkey]\n");
  37         fprintf (stderr, "\tipsecctrl R\n");
  38         fprintf (stderr, "\tipsecctrl I\n");
  39         fprintf (stderr, "\t\tS : Start/Restart Connection\n");
  40         fprintf (stderr, "\t\tD : Stop Connection\n");
  41         fprintf (stderr, "\t\tR : Reload Certificates and Secrets\n");
  42         fprintf (stderr, "\t\tI : Print Statusinfo\n");
  43 }
  44
  45 /*
  46         ACCEPT the ipsec protocol ah, esp & udp (for nat traversal) on the specified interface
  47 */
  48 void open_physical (char *interface, int nat_traversal_port) {
  49         char str[STRING_SIZE];
  50
  51         // GRE ???
  52 //        sprintf(str, "/sbin/iptables -A " phystable " -p 47  -i %s -j ACCEPT", interface);
  53 //        safe_system(str);
  54         // ESP
  55 //        sprintf(str, "/sbin/iptables -A " phystable " -p 50  -i %s -j ACCEPT", interface);
  56 //        safe_system(str);
  57         // AH
  58 //        sprintf(str, "/sbin/iptables -A " phystable " -p 51  -i %s -j ACCEPT", interface);
  59 //        safe_system(str);
  60         // IKE
  61
  62         sprintf(str, "/sbin/iptables -D IPSECINPUT -p udp -i %s --sport 500 --dport 500 -j ACCEPT >/dev/null 2>&1", interface);
  63         safe_system(str);
  64         sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --sport 500 --dport 500 -j ACCEPT", interface);
  65         safe_system(str);
  66
  67         if (! nat_traversal_port)
  68             return;
  69
  70         sprintf(str, "/sbin/iptables -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 -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 -F IPSECINPUT");
  79         safe_system("/sbin/iptables -F IPSECFORWARD");
  80         safe_system("/sbin/iptables -F IPSECOUTPUT");
  81
  82 }
  83
  84 /*
  85  return values from the vpn config file or false if not 'on'
  86 */
  87 int decode_line (char *s,
  88                 char **key,
  89                 char **name,
  90                 char **type,
  91                 char **interface
  92                 ) {
  93         int count = 0;
  94         *key = NULL;
  95         *name = NULL;
  96         *type = NULL;
  97
  98         if (s[strlen(s) - 1] == '\n')
  99                 s[strlen(s) - 1] = '\0';
 100
 101         char *result = strsep(&s, ",");
 102         while (result) {
 103                 if (count == 0)
 104                         *key = result;
 105                 if ((count == 1) && strcmp(result, "on") != 0)
 106                         return 0;       // a disabled line
 107                 if (count == 2)
 108                         *name = result;
 109                 if (count == 4)
 110                         *type = result;
 111                 if (count == 27)
 112                         *interface = result;
 113                 count++;
 114                 result = strsep(&s, ",");
 115         }
 116
 117         // check other syntax
 118         if (! *name)
 119             return 0;
 120
 121         if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) {
 122                 fprintf(stderr, "Bad connection name: %s\n", *name);
 123                 return 0;
 124         }
 125
 126         if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) {
 127                 fprintf(stderr, "Bad connection type: %s\n", *type);
 128                 return 0;
 129         }
 130
 131         if (! (strcmp(*interface, "RED") == 0 || strcmp(*interface, "GREEN") == 0 ||
 132                 strcmp(*interface, "ORANGE") == 0 || strcmp(*interface, "BLUE") == 0)) {
 133                 fprintf(stderr, "Bad interface name: %s\n", *interface);
 134                 return 0;
 135         }
 136         //it's a valid & active line
 137         return 1;
 138 }
 139
 140 /*
 141     issue ipsec commmands to turn on connection 'name'
 142 */
 143 void turn_connection_on (char *name, char *type) {
 144         char command[STRING_SIZE];
 145
 146         safe_system("/usr/sbin/ipsec reload >/dev/null");
 147         memset(command, 0, STRING_SIZE);
 148         /* give ipsec time to be ready */
 149         safe_system("/bin/sleep 5");
 150         snprintf(command, STRING_SIZE - 1,
 151                 "/usr/sbin/ipsec up %s >/dev/null", name);
 152         safe_system(command);
 153 }
 154 /*
 155     issue ipsec commmands to turn off connection 'name'
 156 */
 157 void turn_connection_off (char *name) {
 158         char command[STRING_SIZE];
 159         memset(command, 0, STRING_SIZE);
 160         snprintf(command, STRING_SIZE - 1,
 161                 "/usr/sbin/ipsec whack --delete --name %s >/dev/null", name);
 162         safe_system(command);
 163         safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 164 }
 165
 166
 167 int main(int argc, char *argv[]) {
 168
 169         char configtype[STRING_SIZE];
 170         char redtype[STRING_SIZE] = "";
 171         struct keyvalue *kv = NULL;
 172
 173         if (argc < 2) {
 174                 usage();
 175                 exit(1);
 176         }
 177         if (!(initsetuid()))
 178                 exit(1);
 179
 180  FILE *file = NULL;
 181
 182
 183         if (strcmp(argv[1], "I") == 0) {
 184                 safe_system("/usr/sbin/ipsec whack --status");
 185                 exit(0);
 186         }
 187
 188         if (strcmp(argv[1], "R") == 0) {
 189                 safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 190                 exit(0);
 191         }
 192
 193  /* Get vpnwatch pid */
 194
 195  if ( (argc == 2) && (file = fopen("/var/run/vpn-watch.pid", "r"))) {
 196  safe_system("kill -9 $(cat /var/run/vpn-watch.pid)");
 197  safe_system("unlink /var/run/vpn-watch.pid");
 198  close(file);
 199  }
 200
 201         /* FIXME: workaround for pclose() issue - still no real idea why
 202          * this is happening */
 203         signal(SIGCHLD, SIG_DFL);
 204
 205         /* handle operations that doesn't need start the ipsec system */
 206         if (argc == 2) {
 207                 if (strcmp(argv[1], "D") == 0) {
 208                         /* Only shutdown pluto if it really is running */
 209                         /* Get pluto pid */
 210                         if (file = fopen("/var/run/pluto.pid", "r")) {
 211                                 safe_system("/etc/rc.d/init.d/ipsec stop 2> /dev/null >/dev/null");
 212                                 close(file);
 213                         }
 214                         ipsec_norules();
 215                         exit(0);
 216                 }
 217
 218         }
 219
 220         /* read vpn config */
 221         kv=initkeyvalues();
 222         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 223         {
 224                 fprintf(stderr, "Cannot read vpn settings\n");
 225                 exit(1);
 226         }
 227
 228         /* check is the vpn system is enabled */
 229         {
 230             char s[STRING_SIZE];
 231             findkey(kv, "ENABLED", s);
 232             freekeyvalues(kv);
 233             if (strcmp (s, "on") != 0)
 234                 exit(0);
 235         }
 236
 237         /* read interface settings */
 238         kv=initkeyvalues();
 239         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 240         {
 241                 fprintf(stderr, "Cannot read ethernet settings\n");
 242                 exit(1);
 243         }
 244         if (!findkey(kv, "CONFIG_TYPE", configtype))
 245         {
 246                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 247                 exit(1);
 248         }
 249         findkey(kv, "RED_TYPE", redtype);
 250
 251
 252         /* Loop through the config file to find physical interface that will accept IPSEC */
 253         int enable_red=0;       // states 0: not used
 254         int enable_green=0;     //        1: error condition
 255         int enable_orange=0;    //        2: good
 256         int enable_blue=0;
 257         char if_red[STRING_SIZE] = "";
 258         char if_green[STRING_SIZE] = "";
 259         char if_orange[STRING_SIZE] = "";
 260         char if_blue[STRING_SIZE] = "";
 261         char s[STRING_SIZE];
 262
 263         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 264                 fprintf(stderr, "Couldn't open vpn settings file");
 265                 exit(1);
 266         }
 267         while (fgets(s, STRING_SIZE, file) != NULL) {
 268                 char *key;
 269                 char *name;
 270                 char *type;
 271                 char *interface;
 272                 if (!decode_line(s,&key,&name,&type,&interface))
 273                     continue;
 274                 /* search interface */
 275                 if (!enable_red && strcmp (interface, "RED") == 0) {
 276                         // when RED is up, find interface name in special file
 277                         FILE *ifacefile = NULL;
 278                         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 279                             if (fgets(if_red, STRING_SIZE, ifacefile)) {
 280                                 if (if_red[strlen(if_red) - 1] == '\n')
 281                                         if_red[strlen(if_red) - 1] = '\0';
 282                             }
 283                             fclose (ifacefile);
 284
 285                             if (VALID_DEVICE(if_red))
 286                                 enable_red+=2;                  // present and running
 287                         }
 288                 }
 289
 290                 if (!enable_green && strcmp (interface, "GREEN") == 0) {
 291                         enable_green = 1;
 292                         findkey(kv, "GREEN_DEV", if_green);
 293                         if (VALID_DEVICE(if_green))
 294                             enable_green++;
 295                         else
 296                             fprintf(stderr, "IPSec enabled on green but green interface is invalid or not found\n");
 297                 }
 298
 299                 if (!enable_orange && strcmp (interface, "ORANGE") == 0) {
 300                         enable_orange = 1;
 301                         findkey(kv, "ORANGE_DEV", if_orange);
 302                         if (VALID_DEVICE(if_orange))
 303                             enable_orange++;
 304                         else
 305                             fprintf(stderr, "IPSec enabled on orange but orange interface is invalid or not found\n");
 306                 }
 307
 308                 if (!enable_blue && strcmp (interface, "BLUE") == 0) {
 309                         enable_blue++;
 310                         findkey(kv, "BLUE_DEV", if_blue);
 311                         if (VALID_DEVICE(if_blue))
 312                             enable_blue++;
 313                         else
 314                             fprintf(stderr, "IPSec enabled on blue but blue interface is invalid or not found\n");
 315
 316                 }
 317         }
 318         fclose(file);
 319         freekeyvalues(kv);
 320
 321         // do nothing if something is in error condition
 322         if ((enable_red==1) || (enable_green==1) || (enable_orange==1) || (enable_blue==1) )
 323             exit(1);
 324
 325         // exit if nothing to do
 326         if ( (enable_red+enable_green+enable_orange+enable_blue) == 0 )
 327             exit(0);
 328
 329         // open needed ports
 330         // todo: read a nat_t indicator to allow or not openning UDP/4500
 331         if (enable_red==2)
 332                 open_physical(if_red, 4500);
 333
 334         if (enable_green==2)
 335                 open_physical(if_green, 4500);
 336
 337         if (enable_orange==2)
 338                 open_physical(if_orange, 4500);
 339
 340         if (enable_blue==2)
 341                 open_physical(if_blue, 4500);
 342
 343         // start the system
 344         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 345                 safe_system("/etc/rc.d/init.d/ipsec restart >/dev/null");
 346                 safe_system("/usr/local/bin/vpn-watch &");
 347                 exit(0);
 348         }
 349
 350         // it is a selective start or stop
 351         // second param is only a number 'key'
 352         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 353                 fprintf(stderr, "Bad arg\n");
 354                 usage();
 355                 exit(1);
 356         }
 357
 358         // search the vpn pointed by 'key'
 359         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 360                 fprintf(stderr, "Couldn't open vpn settings file");
 361                 exit(1);
 362         }
 363         while (fgets(s, STRING_SIZE, file) != NULL) {
 364                 char *key;
 365                 char *name;
 366                 char *type;
 367                 char *interface;
 368                 if (!decode_line(s,&key,&name,&type,&interface))
 369                         continue;
 370
 371                 // start/stop a vpn if belonging to specified interface
 372                 if (strcmp(argv[1], interface) == 0 ) {
 373                             if (strcmp(argv[2], "0")==0)
 374                                 turn_connection_off (name);
 375                             else
 376                                 turn_connection_on (name, type);
 377                         continue;
 378                 }
 379                 // is it the 'key' requested ?
 380                 if (strcmp(argv[2], key) != 0)
 381                         continue;
 382                 // Start or Delete this Connection
 383                 if (strcmp(argv[1], "S") == 0)
 384                         turn_connection_on (name, type);
 385                 else
 386                 if (strcmp(argv[1], "D") == 0)
 387                         turn_connection_off (name);
 388                 else {
 389                         fprintf(stderr, "Bad command\n");
 390                         exit(1);
 391                 }
 392         }
 393         fclose(file);
 394         return 0;
 395 }