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         /* give ipsec time to be ready */
 144         safe_system("/bin/sleep 2");
 145         snprintf(command, STRING_SIZE - 1,
 146                 "/usr/sbin/ipsec up %s >/dev/null", name);
 147         safe_system(command);
 148 }
 149 /*
 150     issue ipsec commmands to turn off connection 'name'
 151 */
 152 void turn_connection_off (char *name) {
 153         char command[STRING_SIZE];
 154         memset(command, 0, STRING_SIZE);
 155         snprintf(command, STRING_SIZE - 1,
 156                 "/usr/sbin/ipsec whack --delete --name %s >/dev/null", name);
 157         safe_system(command);
 158         safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 159 }
 160
 161
 162 int main(int argc, char *argv[]) {
 163
 164         char configtype[STRING_SIZE];
 165         char redtype[STRING_SIZE] = "";
 166         struct keyvalue *kv = NULL;
 167
 168         if (argc < 2) {
 169                 usage();
 170                 exit(1);
 171         }
 172         if (!(initsetuid()))
 173                 exit(1);
 174
 175  FILE *file = NULL;
 176
 177
 178         if (strcmp(argv[1], "I") == 0) {
 179                 safe_system("/usr/sbin/ipsec whack --status");
 180                 exit(0);
 181         }
 182
 183         if (strcmp(argv[1], "R") == 0) {
 184                 safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 185                 exit(0);
 186         }
 187
 188  /* Get vpnwatch pid */
 189
 190  if ( (argc == 2) && (file = fopen("/var/run/vpn-watch.pid", "r"))) {
 191  safe_system("kill -9 $(cat /var/run/vpn-watch.pid)");
 192  safe_system("unlink /var/run/vpn-watch.pid");
 193  close(file);
 194  }
 195
 196         /* FIXME: workaround for pclose() issue - still no real idea why
 197          * this is happening */
 198         signal(SIGCHLD, SIG_DFL);
 199
 200         /* handle operations that doesn't need start the ipsec system */
 201         if (argc == 2) {
 202                 if (strcmp(argv[1], "D") == 0) {
 203                         ipsec_norules();
 204                         /* Only shutdown pluto if it really is running */
 205                         /* Get pluto pid */
 206                         if (file = fopen("/var/run/pluto.pid", "r")) {
 207                                 safe_system("/etc/rc.d/init.d/ipsec stop 2> /dev/null >/dev/null");
 208                                 close(file);
 209                         }
 210                         exit(0);
 211                 }
 212
 213         }
 214
 215         /* clear iptables vpn rules */
 216         ipsec_norules();
 217
 218         /* read vpn config */
 219         kv=initkeyvalues();
 220         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 221         {
 222                 fprintf(stderr, "Cannot read vpn settings\n");
 223                 exit(1);
 224         }
 225
 226         /* check is the vpn system is enabled */
 227         {
 228             char s[STRING_SIZE];
 229             findkey(kv, "ENABLED", s);
 230             freekeyvalues(kv);
 231             if (strcmp (s, "on") != 0)
 232                 exit(0);
 233         }
 234
 235         /* read interface settings */
 236         kv=initkeyvalues();
 237         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 238         {
 239                 fprintf(stderr, "Cannot read ethernet settings\n");
 240                 exit(1);
 241         }
 242         if (!findkey(kv, "CONFIG_TYPE", configtype))
 243         {
 244                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 245                 exit(1);
 246         }
 247         findkey(kv, "RED_TYPE", redtype);
 248
 249
 250         /* Loop through the config file to find physical interface that will accept IPSEC */
 251         int enable_red=0;       // states 0: not used
 252         int enable_green=0;     //        1: error condition
 253         int enable_orange=0;    //        2: good
 254         int enable_blue=0;
 255         char if_red[STRING_SIZE] = "";
 256         char if_green[STRING_SIZE] = "";
 257         char if_orange[STRING_SIZE] = "";
 258         char if_blue[STRING_SIZE] = "";
 259         char s[STRING_SIZE];
 260
 261         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 262                 fprintf(stderr, "Couldn't open vpn settings file");
 263                 exit(1);
 264         }
 265         while (fgets(s, STRING_SIZE, file) != NULL) {
 266                 char *key;
 267                 char *name;
 268                 char *type;
 269                 char *interface;
 270                 if (!decode_line(s,&key,&name,&type,&interface))
 271                     continue;
 272                 /* search interface */
 273                 if (!enable_red && strcmp (interface, "RED") == 0) {
 274                         // when RED is up, find interface name in special file
 275                         FILE *ifacefile = NULL;
 276                         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 277                             if (fgets(if_red, STRING_SIZE, ifacefile)) {
 278                                 if (if_red[strlen(if_red) - 1] == '\n')
 279                                         if_red[strlen(if_red) - 1] = '\0';
 280                             }
 281                             fclose (ifacefile);
 282
 283                             if (VALID_DEVICE(if_red))
 284                                 enable_red+=2;                  // present and running
 285                         }
 286                 }
 287
 288                 if (!enable_green && strcmp (interface, "GREEN") == 0) {
 289                         enable_green = 1;
 290                         findkey(kv, "GREEN_DEV", if_green);
 291                         if (VALID_DEVICE(if_green))
 292                             enable_green++;
 293                         else
 294                             fprintf(stderr, "IPSec enabled on green but green interface is invalid or not found\n");
 295                 }
 296
 297                 if (!enable_orange && strcmp (interface, "ORANGE") == 0) {
 298                         enable_orange = 1;
 299                         findkey(kv, "ORANGE_DEV", if_orange);
 300                         if (VALID_DEVICE(if_orange))
 301                             enable_orange++;
 302                         else
 303                             fprintf(stderr, "IPSec enabled on orange but orange interface is invalid or not found\n");
 304                 }
 305
 306                 if (!enable_blue && strcmp (interface, "BLUE") == 0) {
 307                         enable_blue++;
 308                         findkey(kv, "BLUE_DEV", if_blue);
 309                         if (VALID_DEVICE(if_blue))
 310                             enable_blue++;
 311                         else
 312                             fprintf(stderr, "IPSec enabled on blue but blue interface is invalid or not found\n");
 313
 314                 }
 315         }
 316         fclose(file);
 317         freekeyvalues(kv);
 318
 319         // do nothing if something is in error condition
 320         if ((enable_red==1) || (enable_green==1) || (enable_orange==1) || (enable_blue==1) )
 321             exit(1);
 322
 323         // exit if nothing to do
 324         if ( (enable_red+enable_green+enable_orange+enable_blue) == 0 )
 325             exit(0);
 326
 327         // open needed ports
 328         // todo: read a nat_t indicator to allow or not openning UDP/4500
 329         if (enable_red==2)
 330                 open_physical(if_red, 4500);
 331
 332         if (enable_green==2)
 333                 open_physical(if_green, 4500);
 334
 335         if (enable_orange==2)
 336                 open_physical(if_orange, 4500);
 337
 338         if (enable_blue==2)
 339                 open_physical(if_blue, 4500);
 340
 341         // start the system
 342         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 343                 safe_system("/etc/rc.d/init.d/ipsec restart >/dev/null");
 344                 safe_system("/usr/local/bin/vpn-watch &");
 345                 exit(0);
 346         }
 347
 348         // it is a selective start or stop
 349         // second param is only a number 'key'
 350         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 351                 ipsec_norules();
 352                 fprintf(stderr, "Bad arg\n");
 353                 usage();
 354                 exit(1);
 355         }
 356
 357         // search the vpn pointed by 'key'
 358         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 359                 ipsec_norules();
 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                         ipsec_norules();
 390                         fprintf(stderr, "Bad command\n");
 391                         exit(1);
 392                 }
 393         }
 394         fclose(file);
 395         return 0;
 396 }