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  /* Get vpnwatch pid */
 176
 177  if ( (argc == 2) && (file = fopen("/var/run/vpn-watch.pid", "r"))) {
 178  safe_system("kill -9 $(cat /var/run/vpn-watch.pid)");
 179  safe_system("unlink /var/run/vpn-watch.pid");
 180  close(file);
 181  }
 182
 183         /* FIXME: workaround for pclose() issue - still no real idea why
 184          * this is happening */
 185         signal(SIGCHLD, SIG_DFL);
 186
 187         /* handle operations that doesn't need start the ipsec system */
 188         if (argc == 2) {
 189                 if (strcmp(argv[1], "D") == 0) {
 190                         ipsec_norules();
 191                         /* Only shutdown pluto if it really is running */
 192                         /* Get pluto pid */
 193                         if (file = fopen("/var/run/pluto.pid", "r")) {
 194                                 safe_system("/etc/rc.d/init.d/ipsec stop 2> /dev/null >/dev/null");
 195                                 close(file);
 196                         }
 197                         exit(0);
 198                 }
 199
 200                 if (strcmp(argv[1], "R") == 0) {
 201                         safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 202                         exit(0);
 203                 }
 204
 205                 if (strcmp(argv[1], "I") == 0) {
 206                         safe_system("/usr/sbin/ipsec whack --status");
 207                         exit(0);
 208                 }
 209
 210         }
 211
 212         /* clear iptables vpn rules */
 213         ipsec_norules();
 214
 215         /* read vpn config */
 216         kv=initkeyvalues();
 217         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 218         {
 219                 fprintf(stderr, "Cannot read vpn settings\n");
 220                 exit(1);
 221         }
 222
 223         /* check is the vpn system is enabled */
 224         {
 225             char s[STRING_SIZE];
 226             findkey(kv, "ENABLED", s);
 227             freekeyvalues(kv);
 228             if (strcmp (s, "on") != 0)
 229                 exit(0);
 230         }
 231
 232         /* read interface settings */
 233         kv=initkeyvalues();
 234         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 235         {
 236                 fprintf(stderr, "Cannot read ethernet settings\n");
 237                 exit(1);
 238         }
 239         if (!findkey(kv, "CONFIG_TYPE", configtype))
 240         {
 241                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 242                 exit(1);
 243         }
 244         findkey(kv, "RED_TYPE", redtype);
 245
 246
 247         /* Loop through the config file to find physical interface that will accept IPSEC */
 248         int enable_red=0;       // states 0: not used
 249         int enable_green=0;     //        1: error condition
 250         int enable_orange=0;    //        2: good
 251         int enable_blue=0;
 252         char if_red[STRING_SIZE] = "";
 253         char if_green[STRING_SIZE] = "";
 254         char if_orange[STRING_SIZE] = "";
 255         char if_blue[STRING_SIZE] = "";
 256         char s[STRING_SIZE];
 257
 258         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 259                 fprintf(stderr, "Couldn't open vpn settings file");
 260                 exit(1);
 261         }
 262         while (fgets(s, STRING_SIZE, file) != NULL) {
 263                 char *key;
 264                 char *name;
 265                 char *type;
 266                 char *interface;
 267                 if (!decode_line(s,&key,&name,&type,&interface))
 268                     continue;
 269                 /* search interface */
 270                 if (!enable_red && strcmp (interface, "RED") == 0) {
 271                         // when RED is up, find interface name in special file
 272                         FILE *ifacefile = NULL;
 273                         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 274                             if (fgets(if_red, STRING_SIZE, ifacefile)) {
 275                                 if (if_red[strlen(if_red) - 1] == '\n')
 276                                         if_red[strlen(if_red) - 1] = '\0';
 277                             }
 278                             fclose (ifacefile);
 279
 280                             if (VALID_DEVICE(if_red))
 281                                 enable_red+=2;                  // present and running
 282                         }
 283                 }
 284
 285                 if (!enable_green && strcmp (interface, "GREEN") == 0) {
 286                         enable_green = 1;
 287                         findkey(kv, "GREEN_DEV", if_green);
 288                         if (VALID_DEVICE(if_green))
 289                             enable_green++;
 290                         else
 291                             fprintf(stderr, "IPSec enabled on green but green interface is invalid or not found\n");
 292                 }
 293
 294                 if (!enable_orange && strcmp (interface, "ORANGE") == 0) {
 295                         enable_orange = 1;
 296                         findkey(kv, "ORANGE_DEV", if_orange);
 297                         if (VALID_DEVICE(if_orange))
 298                             enable_orange++;
 299                         else
 300                             fprintf(stderr, "IPSec enabled on orange but orange interface is invalid or not found\n");
 301                 }
 302
 303                 if (!enable_blue && strcmp (interface, "BLUE") == 0) {
 304                         enable_blue++;
 305                         findkey(kv, "BLUE_DEV", if_blue);
 306                         if (VALID_DEVICE(if_blue))
 307                             enable_blue++;
 308                         else
 309                             fprintf(stderr, "IPSec enabled on blue but blue interface is invalid or not found\n");
 310
 311                 }
 312         }
 313         fclose(file);
 314         freekeyvalues(kv);
 315
 316         // do nothing if something is in error condition
 317         if ((enable_red==1) || (enable_green==1) || (enable_orange==1) || (enable_blue==1) )
 318             exit(1);
 319
 320         // exit if nothing to do
 321         if ( (enable_red+enable_green+enable_orange+enable_blue) == 0 )
 322             exit(0);
 323
 324         // open needed ports
 325         // todo: read a nat_t indicator to allow or not openning UDP/4500
 326         if (enable_red==2)
 327                 open_physical(if_red, 4500);
 328
 329         if (enable_green==2)
 330                 open_physical(if_green, 4500);
 331
 332         if (enable_orange==2)
 333                 open_physical(if_orange, 4500);
 334
 335         if (enable_blue==2)
 336                 open_physical(if_blue, 4500);
 337
 338         // start the system
 339         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 340                 safe_system("/etc/rc.d/init.d/ipsec restart >/dev/null");
 341                 safe_system("/usr/local/bin/vpn-watch &");
 342                 exit(0);
 343         }
 344
 345         // it is a selective start or stop
 346         // second param is only a number 'key'
 347         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 348                 ipsec_norules();
 349                 fprintf(stderr, "Bad arg\n");
 350                 usage();
 351                 exit(1);
 352         }
 353
 354         // search the vpn pointed by 'key'
 355         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 356                 ipsec_norules();
 357                 fprintf(stderr, "Couldn't open vpn settings file");
 358                 exit(1);
 359         }
 360         while (fgets(s, STRING_SIZE, file) != NULL) {
 361                 char *key;
 362                 char *name;
 363                 char *type;
 364                 char *interface;
 365                 if (!decode_line(s,&key,&name,&type,&interface))
 366                         continue;
 367
 368                 // start/stop a vpn if belonging to specified interface
 369                 if (strcmp(argv[1], interface) == 0 ) {
 370                             if (strcmp(argv[2], "0")==0)
 371                                 turn_connection_off (name);
 372                             else
 373                                 turn_connection_on (name, type);
 374                         continue;
 375                 }
 376                 // is it the 'key' requested ?
 377                 if (strcmp(argv[2], key) != 0)
 378                         continue;
 379                 // Start or Delete this Connection
 380                 if (strcmp(argv[1], "S") == 0)
 381                         turn_connection_on (name, type);
 382                 else
 383                 if (strcmp(argv[1], "D") == 0)
 384                         turn_connection_off (name);
 385                 else {
 386                         ipsec_norules();
 387                         fprintf(stderr, "Bad command\n");
 388                         exit(1);
 389                 }
 390         }
 391         fclose(file);
 392         return 0;
 393 }