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         sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --sport 500 --dport 500 -j ACCEPT", interface);
  62         safe_system(str);
  63
  64         if (! nat_traversal_port)
  65             return;
  66
  67         sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --dport %i -j ACCEPT", interface, nat_traversal_port);
  68         safe_system(str);
  69 }
  70
  71 void ipsec_norules() {
  72         /* clear input rules */
  73         safe_system("/sbin/iptables -F IPSECINPUT");
  74         safe_system("/sbin/iptables -F IPSECFORWARD");
  75         safe_system("/sbin/iptables -F IPSECOUTPUT");
  76
  77 }
  78
  79 /*
  80  return values from the vpn config file or false if not 'on'
  81 */
  82 int decode_line (char *s,
  83                 char **key,
  84                 char **name,
  85                 char **type,
  86                 char **interface
  87                 ) {
  88         int count = 0;
  89         *key = NULL;
  90         *name = NULL;
  91         *type = NULL;
  92
  93         if (s[strlen(s) - 1] == '\n')
  94                 s[strlen(s) - 1] = '\0';
  95
  96         char *result = strsep(&s, ",");
  97         while (result) {
  98                 if (count == 0)
  99                         *key = result;
 100                 if ((count == 1) && strcmp(result, "on") != 0)
 101                         return 0;       // a disabled line
 102                 if (count == 2)
 103                         *name = result;
 104                 if (count == 4)
 105                         *type = result;
 106                 if (count == 27)
 107                         *interface = result;
 108                 count++;
 109                 result = strsep(&s, ",");
 110         }
 111
 112         // check other syntax
 113         if (! *name)
 114             return 0;
 115
 116         if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) {
 117                 fprintf(stderr, "Bad connection name: %s\n", *name);
 118                 return 0;
 119         }
 120
 121         if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) {
 122                 fprintf(stderr, "Bad connection type: %s\n", *type);
 123                 return 0;
 124         }
 125
 126         if (! (strcmp(*interface, "RED") == 0 || strcmp(*interface, "GREEN") == 0 ||
 127                 strcmp(*interface, "ORANGE") == 0 || strcmp(*interface, "BLUE") == 0)) {
 128                 fprintf(stderr, "Bad interface name: %s\n", *interface);
 129                 return 0;
 130         }
 131         //it's a valid & active line
 132         return 1;
 133 }
 134
 135 /*
 136     issue ipsec commmands to turn on connection 'name'
 137 */
 138 void turn_connection_on (char *name, char *type) {
 139         char command[STRING_SIZE];
 140
 141         safe_system("/usr/sbin/ipsec reload >/dev/null");
 142         memset(command, 0, STRING_SIZE);
 143         snprintf(command, STRING_SIZE - 1,
 144                 "/usr/sbin/ipsec up %s >/dev/null", name);
 145         safe_system(command);
 146 }
 147 /*
 148     issue ipsec commmands to turn off connection 'name'
 149 */
 150 void turn_connection_off (char *name) {
 151         char command[STRING_SIZE];
 152         memset(command, 0, STRING_SIZE);
 153         snprintf(command, STRING_SIZE - 1,
 154                 "/usr/sbin/ipsec whack --delete --name %s >/dev/null", name);
 155         safe_system(command);
 156         safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 157 }
 158
 159
 160 int main(int argc, char *argv[]) {
 161
 162         char configtype[STRING_SIZE];
 163         char redtype[STRING_SIZE] = "";
 164         struct keyvalue *kv = NULL;
 165
 166         if (argc < 2) {
 167                 usage();
 168                 exit(1);
 169         }
 170         if (!(initsetuid()))
 171                 exit(1);
 172
 173  FILE *file = NULL;
 174
 175
 176         if (strcmp(argv[1], "I") == 0) {
 177                 safe_system("/usr/sbin/ipsec whack --status");
 178                 exit(0);
 179         }
 180
 181         if (strcmp(argv[1], "R") == 0) {
 182                 safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 183                 exit(0);
 184         }
 185
 186  /* Get vpnwatch pid */
 187
 188  if ( (argc == 2) && (file = fopen("/var/run/vpn-watch.pid", "r"))) {
 189  safe_system("kill -9 $(cat /var/run/vpn-watch.pid)");
 190  safe_system("unlink /var/run/vpn-watch.pid");
 191  close(file);
 192  }
 193
 194         /* FIXME: workaround for pclose() issue - still no real idea why
 195          * this is happening */
 196         signal(SIGCHLD, SIG_DFL);
 197
 198         /* handle operations that doesn't need start the ipsec system */
 199         if (argc == 2) {
 200                 if (strcmp(argv[1], "D") == 0) {
 201                         ipsec_norules();
 202                         /* Only shutdown pluto if it really is running */
 203                         /* Get pluto pid */
 204                         if (file = fopen("/var/run/pluto.pid", "r")) {
 205                                 safe_system("/etc/rc.d/init.d/ipsec stop 2> /dev/null >/dev/null");
 206                                 close(file);
 207                         }
 208                         exit(0);
 209                 }
 210
 211         }
 212
 213         /* clear iptables vpn rules */
 214         ipsec_norules();
 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         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 260                 fprintf(stderr, "Couldn't open vpn settings file");
 261                 exit(1);
 262         }
 263         while (fgets(s, STRING_SIZE, file) != NULL) {
 264                 char *key;
 265                 char *name;
 266                 char *type;
 267                 char *interface;
 268                 if (!decode_line(s,&key,&name,&type,&interface))
 269                     continue;
 270                 /* search interface */
 271                 if (!enable_red && strcmp (interface, "RED") == 0) {
 272                         // when RED is up, find interface name in special file
 273                         FILE *ifacefile = NULL;
 274                         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 275                             if (fgets(if_red, STRING_SIZE, ifacefile)) {
 276                                 if (if_red[strlen(if_red) - 1] == '\n')
 277                                         if_red[strlen(if_red) - 1] = '\0';
 278                             }
 279                             fclose (ifacefile);
 280
 281                             if (VALID_DEVICE(if_red))
 282                                 enable_red+=2;                  // present and running
 283                         }
 284                 }
 285
 286                 if (!enable_green && strcmp (interface, "GREEN") == 0) {
 287                         enable_green = 1;
 288                         findkey(kv, "GREEN_DEV", if_green);
 289                         if (VALID_DEVICE(if_green))
 290                             enable_green++;
 291                         else
 292                             fprintf(stderr, "IPSec enabled on green but green interface is invalid or not found\n");
 293                 }
 294
 295                 if (!enable_orange && strcmp (interface, "ORANGE") == 0) {
 296                         enable_orange = 1;
 297                         findkey(kv, "ORANGE_DEV", if_orange);
 298                         if (VALID_DEVICE(if_orange))
 299                             enable_orange++;
 300                         else
 301                             fprintf(stderr, "IPSec enabled on orange but orange interface is invalid or not found\n");
 302                 }
 303
 304                 if (!enable_blue && strcmp (interface, "BLUE") == 0) {
 305                         enable_blue++;
 306                         findkey(kv, "BLUE_DEV", if_blue);
 307                         if (VALID_DEVICE(if_blue))
 308                             enable_blue++;
 309                         else
 310                             fprintf(stderr, "IPSec enabled on blue but blue interface is invalid or not found\n");
 311
 312                 }
 313         }
 314         fclose(file);
 315         freekeyvalues(kv);
 316
 317         // do nothing if something is in error condition
 318         if ((enable_red==1) || (enable_green==1) || (enable_orange==1) || (enable_blue==1) )
 319             exit(1);
 320
 321         // exit if nothing to do
 322         if ( (enable_red+enable_green+enable_orange+enable_blue) == 0 )
 323             exit(0);
 324
 325         // open needed ports
 326         // todo: read a nat_t indicator to allow or not openning UDP/4500
 327         if (enable_red==2)
 328                 open_physical(if_red, 4500);
 329
 330         if (enable_green==2)
 331                 open_physical(if_green, 4500);
 332
 333         if (enable_orange==2)
 334                 open_physical(if_orange, 4500);
 335
 336         if (enable_blue==2)
 337                 open_physical(if_blue, 4500);
 338
 339         // start the system
 340         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 341                 safe_system("/etc/rc.d/init.d/ipsec restart >/dev/null");
 342                 safe_system("/usr/local/bin/vpn-watch &");
 343                 exit(0);
 344         }
 345
 346         // it is a selective start or stop
 347         // second param is only a number 'key'
 348         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 349                 ipsec_norules();
 350                 fprintf(stderr, "Bad arg\n");
 351                 usage();
 352                 exit(1);
 353         }
 354
 355         // search the vpn pointed by 'key'
 356         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 357                 ipsec_norules();
 358                 fprintf(stderr, "Couldn't open vpn settings file");
 359                 exit(1);
 360         }
 361         while (fgets(s, STRING_SIZE, file) != NULL) {
 362                 char *key;
 363                 char *name;
 364                 char *type;
 365                 char *interface;
 366                 if (!decode_line(s,&key,&name,&type,&interface))
 367                         continue;
 368
 369                 // start/stop a vpn if belonging to specified interface
 370                 if (strcmp(argv[1], interface) == 0 ) {
 371                             if (strcmp(argv[2], "0")==0)
 372                                 turn_connection_off (name);
 373                             else
 374                                 turn_connection_on (name, type);
 375                         continue;
 376                 }
 377                 // is it the 'key' requested ?
 378                 if (strcmp(argv[2], key) != 0)
 379                         continue;
 380                 // Start or Delete this Connection
 381                 if (strcmp(argv[1], "S") == 0)
 382                         turn_connection_on (name, type);
 383                 else
 384                 if (strcmp(argv[1], "D") == 0)
 385                         turn_connection_off (name);
 386                 else {
 387                         ipsec_norules();
 388                         fprintf(stderr, "Bad command\n");
 389                         exit(1);
 390                 }
 391         }
 392         fclose(file);
 393         return 0;
 394 }