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         if (file = fopen("/var/run/vpn-watch.pid", "r")) {
 146             safe_system("kill -9 $(cat /var/run/vpn-watch.pid)");
 147             safe_system("unlink /var/run/vpn-watch.pid");
 148             close(file);
 149         }
 150         safe_system("/etc/rc.d/init.d/ipsec restart >/dev/null");
 151         safe_system("/usr/local/bin/vpn-watch &");
 152 }
 153 /*
 154     issue ipsec commmands to turn off connection 'name'
 155 */
 156 void turn_connection_off (char *name) {
 157         char command[STRING_SIZE];
 158         memset(command, 0, STRING_SIZE);
 159         snprintf(command, STRING_SIZE - 1,
 160                 "/usr/sbin/ipsec whack --delete --name %s >/dev/null", name);
 161         safe_system(command);
 162         safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 163 }
 164
 165
 166 int main(int argc, char *argv[]) {
 167
 168         char configtype[STRING_SIZE];
 169         char redtype[STRING_SIZE] = "";
 170         struct keyvalue *kv = NULL;
 171
 172         if (argc < 2) {
 173                 usage();
 174                 exit(1);
 175         }
 176         if (!(initsetuid()))
 177                 exit(1);
 178
 179  FILE *file = NULL;
 180
 181
 182         if (strcmp(argv[1], "I") == 0) {
 183                 safe_system("/usr/sbin/ipsec whack --status");
 184                 exit(0);
 185         }
 186
 187         if (strcmp(argv[1], "R") == 0) {
 188                 safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 189                 exit(0);
 190         }
 191
 192  /* Get vpnwatch pid */
 193
 194
 195         /* FIXME: workaround for pclose() issue - still no real idea why
 196          * this is happening */
 197         signal(SIGCHLD, SIG_DFL);
 198
 199         /* handle operations that doesn't need start the ipsec system */
 200         if (argc == 2) {
 201                 if (strcmp(argv[1], "D") == 0) {
 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                         ipsec_norules();
 209                         exit(0);
 210                 }
 211
 212         }
 213
 214         /* read vpn config */
 215         kv=initkeyvalues();
 216         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 217         {
 218                 fprintf(stderr, "Cannot read vpn settings\n");
 219                 exit(1);
 220         }
 221
 222         /* check is the vpn system is enabled */
 223         {
 224             char s[STRING_SIZE];
 225             findkey(kv, "ENABLED", s);
 226             freekeyvalues(kv);
 227             if (strcmp (s, "on") != 0)
 228                 exit(0);
 229         }
 230
 231         /* read interface settings */
 232         kv=initkeyvalues();
 233         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 234         {
 235                 fprintf(stderr, "Cannot read ethernet settings\n");
 236                 exit(1);
 237         }
 238         if (!findkey(kv, "CONFIG_TYPE", configtype))
 239         {
 240                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 241                 exit(1);
 242         }
 243         findkey(kv, "RED_TYPE", redtype);
 244
 245
 246         /* Loop through the config file to find physical interface that will accept IPSEC */
 247         int enable_red=0;       // states 0: not used
 248         int enable_green=0;     //        1: error condition
 249         int enable_orange=0;    //        2: good
 250         int enable_blue=0;
 251         char if_red[STRING_SIZE] = "";
 252         char if_green[STRING_SIZE] = "";
 253         char if_orange[STRING_SIZE] = "";
 254         char if_blue[STRING_SIZE] = "";
 255         char s[STRING_SIZE];
 256
 257         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 258                 fprintf(stderr, "Couldn't open vpn settings file");
 259                 exit(1);
 260         }
 261         while (fgets(s, STRING_SIZE, file) != NULL) {
 262                 char *key;
 263                 char *name;
 264                 char *type;
 265                 char *interface;
 266                 if (!decode_line(s,&key,&name,&type,&interface))
 267                     continue;
 268                 /* search interface */
 269                 if (!enable_red && strcmp (interface, "RED") == 0) {
 270                         // when RED is up, find interface name in special file
 271                         FILE *ifacefile = NULL;
 272                         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 273                             if (fgets(if_red, STRING_SIZE, ifacefile)) {
 274                                 if (if_red[strlen(if_red) - 1] == '\n')
 275                                         if_red[strlen(if_red) - 1] = '\0';
 276                             }
 277                             fclose (ifacefile);
 278
 279                             if (VALID_DEVICE(if_red))
 280                                 enable_red+=2;                  // present and running
 281                         }
 282                 }
 283
 284                 if (!enable_green && strcmp (interface, "GREEN") == 0) {
 285                         enable_green = 1;
 286                         findkey(kv, "GREEN_DEV", if_green);
 287                         if (VALID_DEVICE(if_green))
 288                             enable_green++;
 289                         else
 290                             fprintf(stderr, "IPSec enabled on green but green interface is invalid or not found\n");
 291                 }
 292
 293                 if (!enable_orange && strcmp (interface, "ORANGE") == 0) {
 294                         enable_orange = 1;
 295                         findkey(kv, "ORANGE_DEV", if_orange);
 296                         if (VALID_DEVICE(if_orange))
 297                             enable_orange++;
 298                         else
 299                             fprintf(stderr, "IPSec enabled on orange but orange interface is invalid or not found\n");
 300                 }
 301
 302                 if (!enable_blue && strcmp (interface, "BLUE") == 0) {
 303                         enable_blue++;
 304                         findkey(kv, "BLUE_DEV", if_blue);
 305                         if (VALID_DEVICE(if_blue))
 306                             enable_blue++;
 307                         else
 308                             fprintf(stderr, "IPSec enabled on blue but blue interface is invalid or not found\n");
 309
 310                 }
 311         }
 312         fclose(file);
 313         freekeyvalues(kv);
 314
 315         // do nothing if something is in error condition
 316         if ((enable_red==1) || (enable_green==1) || (enable_orange==1) || (enable_blue==1) )
 317             exit(1);
 318
 319         // exit if nothing to do
 320         if ( (enable_red+enable_green+enable_orange+enable_blue) == 0 )
 321             exit(0);
 322
 323         // open needed ports
 324         // todo: read a nat_t indicator to allow or not openning UDP/4500
 325         if (enable_red==2)
 326                 open_physical(if_red, 4500);
 327
 328         if (enable_green==2)
 329                 open_physical(if_green, 4500);
 330
 331         if (enable_orange==2)
 332                 open_physical(if_orange, 4500);
 333
 334         if (enable_blue==2)
 335                 open_physical(if_blue, 4500);
 336
 337         // start the system
 338         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 339                 exit(0);
 340         }
 341
 342         // it is a selective start or stop
 343         // second param is only a number 'key'
 344         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 345                 fprintf(stderr, "Bad arg\n");
 346                 usage();
 347                 exit(1);
 348         }
 349
 350         // search the vpn pointed by 'key'
 351         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 352                 fprintf(stderr, "Couldn't open vpn settings file");
 353                 exit(1);
 354         }
 355         while (fgets(s, STRING_SIZE, file) != NULL) {
 356                 char *key;
 357                 char *name;
 358                 char *type;
 359                 char *interface;
 360                 if (!decode_line(s,&key,&name,&type,&interface))
 361                         continue;
 362
 363                 // start/stop a vpn if belonging to specified interface
 364                 if (strcmp(argv[1], interface) == 0 ) {
 365                             if (strcmp(argv[2], "0")==0)
 366                                 turn_connection_off (name);
 367                             else
 368                                 turn_connection_on (name, type);
 369                         continue;
 370                 }
 371                 // is it the 'key' requested ?
 372                 if (strcmp(argv[2], key) != 0)
 373                         continue;
 374                 // Start or Delete this Connection
 375                 if (strcmp(argv[1], "S") == 0)
 376                         turn_connection_on (name, type);
 377                 else
 378                 if (strcmp(argv[1], "D") == 0)
 379                         turn_connection_off (name);
 380                 else {
 381                         fprintf(stderr, "Bad command\n");
 382                         exit(1);
 383                 }
 384         }
 385         fclose(file);
 386         return 0;
 387 }