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 /*
 145     if you find a way to start a single connection without changing all add it
 146     here. Change also vpn-watch.
 147 */
 148         safe_system("/etc/rc.d/init.d/ipsec restart >/dev/null");
 149 }
 150 /*
 151     issue ipsec commmands to turn off connection 'name'
 152 */
 153 void turn_connection_off (char *name) {
 154         char command[STRING_SIZE];
 155         memset(command, 0, STRING_SIZE);
 156         snprintf(command, STRING_SIZE - 1,
 157                 "/usr/sbin/ipsec whack --delete --name %s >/dev/null", name);
 158         safe_system(command);
 159         safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 160 }
 161
 162
 163 int main(int argc, char *argv[]) {
 164
 165         char configtype[STRING_SIZE];
 166         char redtype[STRING_SIZE] = "";
 167         struct keyvalue *kv = NULL;
 168
 169         if (argc < 2) {
 170                 usage();
 171                 exit(1);
 172         }
 173         if (!(initsetuid()))
 174                 exit(1);
 175
 176  FILE *file = NULL;
 177
 178
 179         if (strcmp(argv[1], "I") == 0) {
 180                 safe_system("/usr/sbin/ipsec whack --status");
 181                 exit(0);
 182         }
 183
 184         if (strcmp(argv[1], "R") == 0) {
 185                 safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null");
 186                 exit(0);
 187         }
 188
 189  /* Get vpnwatch pid */
 190
 191
 192         if ((argc == 2) && (file = fopen("/var/run/vpn-watch.pid", "r"))) {
 193             safe_system("kill -9 $(cat /var/run/vpn-watch.pid)");
 194             safe_system("unlink /var/run/vpn-watch.pid");
 195             close(file);
 196         }
 197
 198         /* FIXME: workaround for pclose() issue - still no real idea why
 199          * this is happening */
 200         signal(SIGCHLD, SIG_DFL);
 201
 202         /* handle operations that doesn't need start the ipsec system */
 203         if (argc == 2) {
 204                 if (strcmp(argv[1], "D") == 0) {
 205                         /* Only shutdown pluto if it really is running */
 206                         /* Get pluto pid */
 207                         if (file = fopen("/var/run/pluto.pid", "r")) {
 208                                 safe_system("/etc/rc.d/init.d/ipsec stop 2> /dev/null >/dev/null");
 209                                 close(file);
 210                         }
 211                         ipsec_norules();
 212                         exit(0);
 213                 }
 214
 215         }
 216
 217         /* read vpn config */
 218         kv=initkeyvalues();
 219         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 220         {
 221                 fprintf(stderr, "Cannot read vpn settings\n");
 222                 exit(1);
 223         }
 224
 225         /* check is the vpn system is enabled */
 226         {
 227             char s[STRING_SIZE];
 228             findkey(kv, "ENABLED", s);
 229             freekeyvalues(kv);
 230             if (strcmp (s, "on") != 0)
 231                 exit(0);
 232         }
 233
 234         /* read interface settings */
 235         kv=initkeyvalues();
 236         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 237         {
 238                 fprintf(stderr, "Cannot read ethernet settings\n");
 239                 exit(1);
 240         }
 241         if (!findkey(kv, "CONFIG_TYPE", configtype))
 242         {
 243                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 244                 exit(1);
 245         }
 246         findkey(kv, "RED_TYPE", redtype);
 247
 248
 249         /* Loop through the config file to find physical interface that will accept IPSEC */
 250         int enable_red=0;       // states 0: not used
 251         int enable_green=0;     //        1: error condition
 252         int enable_orange=0;    //        2: good
 253         int enable_blue=0;
 254         char if_red[STRING_SIZE] = "";
 255         char if_green[STRING_SIZE] = "";
 256         char if_orange[STRING_SIZE] = "";
 257         char if_blue[STRING_SIZE] = "";
 258         char s[STRING_SIZE];
 259
 260         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 261                 fprintf(stderr, "Couldn't open vpn settings file");
 262                 exit(1);
 263         }
 264         while (fgets(s, STRING_SIZE, file) != NULL) {
 265                 char *key;
 266                 char *name;
 267                 char *type;
 268                 char *interface;
 269                 if (!decode_line(s,&key,&name,&type,&interface))
 270                     continue;
 271                 /* search interface */
 272                 if (!enable_red && strcmp (interface, "RED") == 0) {
 273                         // when RED is up, find interface name in special file
 274                         FILE *ifacefile = NULL;
 275                         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 276                             if (fgets(if_red, STRING_SIZE, ifacefile)) {
 277                                 if (if_red[strlen(if_red) - 1] == '\n')
 278                                         if_red[strlen(if_red) - 1] = '\0';
 279                             }
 280                             fclose (ifacefile);
 281
 282                             if (VALID_DEVICE(if_red))
 283                                 enable_red+=2;                  // present and running
 284                         }
 285                 }
 286
 287                 if (!enable_green && strcmp (interface, "GREEN") == 0) {
 288                         enable_green = 1;
 289                         findkey(kv, "GREEN_DEV", if_green);
 290                         if (VALID_DEVICE(if_green))
 291                             enable_green++;
 292                         else
 293                             fprintf(stderr, "IPSec enabled on green but green interface is invalid or not found\n");
 294                 }
 295
 296                 if (!enable_orange && strcmp (interface, "ORANGE") == 0) {
 297                         enable_orange = 1;
 298                         findkey(kv, "ORANGE_DEV", if_orange);
 299                         if (VALID_DEVICE(if_orange))
 300                             enable_orange++;
 301                         else
 302                             fprintf(stderr, "IPSec enabled on orange but orange interface is invalid or not found\n");
 303                 }
 304
 305                 if (!enable_blue && strcmp (interface, "BLUE") == 0) {
 306                         enable_blue++;
 307                         findkey(kv, "BLUE_DEV", if_blue);
 308                         if (VALID_DEVICE(if_blue))
 309                             enable_blue++;
 310                         else
 311                             fprintf(stderr, "IPSec enabled on blue but blue interface is invalid or not found\n");
 312
 313                 }
 314         }
 315         fclose(file);
 316         freekeyvalues(kv);
 317
 318         // do nothing if something is in error condition
 319         if ((enable_red==1) || (enable_green==1) || (enable_orange==1) || (enable_blue==1) )
 320             exit(1);
 321
 322         // exit if nothing to do
 323         if ( (enable_red+enable_green+enable_orange+enable_blue) == 0 )
 324             exit(0);
 325
 326         // open needed ports
 327         // todo: read a nat_t indicator to allow or not openning UDP/4500
 328         if (enable_red==2)
 329                 open_physical(if_red, 4500);
 330
 331         if (enable_green==2)
 332                 open_physical(if_green, 4500);
 333
 334         if (enable_orange==2)
 335                 open_physical(if_orange, 4500);
 336
 337         if (enable_blue==2)
 338                 open_physical(if_blue, 4500);
 339
 340         // start the system
 341         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 342                 safe_system("/etc/rc.d/init.d/ipsec restart >/dev/null");
 343                 safe_system("/usr/local/bin/vpn-watch &");
 344                 exit(0);
 345         }
 346
 347         // it is a selective start or stop
 348         // second param is only a number 'key'
 349         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 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                 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                         fprintf(stderr, "Bad command\n");
 387                         exit(1);
 388                 }
 389         }
 390         fclose(file);
 391         return 0;
 392 }