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     IPCop should control vpn this way:
  32
  33     rc.netaddrsesup.up
  34             call ipsecctrl once to start vpns on all interface
  35             RED based vpn won't start because "auto=ignore" instead off "auto=start"
  36
  37     rc.updatered
  38             call ipsectrl to turn on or off vpn based on RED
  39
  40     but now it is only:
  41
  42     rc.updatered
  43             call ipsectrl S at every event on RED.
  44             Consequence: BLUE vpn is not started until RED goes up.
  45
  46
  47 */
  48
  49 #define phystable       "IPSECPHYSICAL"
  50 #define virtualtable    "IPSECVIRTUAL"
  51
  52 void usage() {
  53         fprintf (stderr, "Usage:\n");
  54         fprintf (stderr, "\tipsecctrl S [connectionkey]\n");
  55         fprintf (stderr, "\tipsecctrl D [connectionkey]\n");
  56         fprintf (stderr, "\tipsecctrl R\n");
  57         fprintf (stderr, "\t\tS : Start/Restart Connection\n");
  58         fprintf (stderr, "\t\tD : Stop Connection\n");
  59         fprintf (stderr, "\t\tR : Reload Certificates and Secrets\n");
  60 }
  61
  62 void load_modules() {
  63         safe_system("/sbin/modprobe ipsec");
  64 }
  65
  66 /*
  67         ACCEPT the ipsec protocol ah, esp & udp (for nat traversal) on the specified interface
  68 */
  69 void open_physical (char *interface, int nat_traversal_port) {
  70         char str[STRING_SIZE];
  71
  72         // GRE ???
  73         sprintf(str, "/sbin/iptables -A " phystable " -p 47  -i %s -j ACCEPT", interface);
  74         safe_system(str);
  75         // ESP
  76         sprintf(str, "/sbin/iptables -A " phystable " -p 50  -i %s -j ACCEPT", interface);
  77         safe_system(str);
  78         // AH
  79         sprintf(str, "/sbin/iptables -A " phystable " -p 51  -i %s -j ACCEPT", interface);
  80         safe_system(str);
  81         // IKE
  82         sprintf(str, "/sbin/iptables -A " phystable " -p udp -i %s --sport 500 --dport 500 -j ACCEPT", interface);
  83         safe_system(str);
  84
  85         if (! nat_traversal_port)
  86             return;
  87
  88         sprintf(str, "/sbin/iptables -A " phystable " -p udp -i %s --dport %i -j ACCEPT", interface, nat_traversal_port);
  89         safe_system(str);
  90 }
  91
  92 /*
  93     Basic control for what can flow from/to ipsecX interfaces.
  94
  95     rc.firewall call this chain just before ACCEPTing everything
  96     from green (-i DEV_GREEN -j ACCEPT).
  97 */
  98 void open_virtual (void) {
  99         // allow anything from any ipsec to go on all interface, including other ipsec
 100         safe_system("/sbin/iptables -A " virtualtable " -i ipsec+ -j ACCEPT");
 101         //todo: BOT extension?; allowing ipsec0<<==port-list-filter==>>GREEN ?
 102 }
 103
 104 void ipsec_norules() {
 105         /* clear input rules */
 106         safe_system("/sbin/iptables -F " phystable);
 107         safe_system("/sbin/iptables -F " virtualtable);
 108
 109         // unmap red alias ????
 110 }
 111
 112
 113 void add_alias_interfaces(char *configtype,
 114                           char *redtype,
 115                           char *redif,
 116                           int offset)           //reserve room for ipsec0=red, ipsec1=green, ipsec2=orange,ipsec3=blue
 117 {
 118         FILE *file = NULL;
 119         char s[STRING_SIZE];
 120         int alias=0;
 121
 122         /* Check for CONFIG_TYPE=2 or 3 i.e. RED ethernet present. If not,
 123         * exit gracefully.  This is not an error... */
 124         if (!((strcmp(configtype, "2")==0) || (strcmp(configtype, "3")==0) || (strcmp(configtype, "6")==0) || (strcmp(configtype, "7")==0)))
 125                 return;
 126
 127         /* Now check the RED_TYPE - aliases only work with STATIC. */
 128         if (!(strcmp(redtype, "STATIC")==0))
 129                 return;
 130
 131         /* Now set up the new aliases from the config file */
 132         if (!(file = fopen(CONFIG_ROOT "/ethernet/aliases", "r")))
 133         {
 134                 fprintf(stderr, "Unable to open aliases configuration file\n");
 135                 return;
 136         }
 137         while (fgets(s, STRING_SIZE, file) != NULL && (offset+alias) < 16 )
 138         {
 139                 if (s[strlen(s) - 1] == '\n')
 140                         s[strlen(s) - 1] = '\0';
 141                 int count = 0;
 142                 char *aliasip=NULL;
 143                 char *enabled=NULL;
 144                 char *comment=NULL;
 145                 char *sptr = strtok(s, ",");
 146                 while (sptr)
 147                 {
 148                         if (count == 0)
 149                                 aliasip = sptr;
 150                         if (count == 1)
 151                                 enabled = sptr;
 152                         else
 153                                 comment = sptr;
 154                         count++;
 155                         sptr = strtok(NULL, ",");
 156                 }
 157
 158                 if (!(aliasip && enabled))
 159                         continue;
 160
 161                 if (!VALID_IP(aliasip))
 162                 {
 163                         fprintf(stderr, "Bad alias : %s\n", aliasip);
 164                         return;
 165                 }
 166
 167                 if (strcmp(enabled, "on") == 0)
 168                 {
 169                         memset(s, 0, STRING_SIZE);
 170                         snprintf(s, STRING_SIZE-1, "/usr/sbin/ipsec tncfg --attach --virtual ipsec%d --physical %s:%d >/dev/null", offset+alias, redif, alias);
 171                         safe_system(s);
 172                         alias++;
 173                 }
 174         }
 175 }
 176
 177 /*
 178  return values from the vpn config file or false if not 'on'
 179 */
 180 int decode_line (char *s,
 181                 char **key,
 182                 char **name,
 183                 char **type,
 184                 char **interface
 185                 ) {
 186         int count = 0;
 187         *key = NULL;
 188         *name = NULL;
 189         *type = NULL;
 190
 191         if (s[strlen(s) - 1] == '\n')
 192                 s[strlen(s) - 1] = '\0';
 193
 194         char *result = strsep(&s, ",");
 195         while (result) {
 196                 if (count == 0)
 197                         *key = result;
 198                 if ((count == 1) && strcmp(result, "on") != 0)
 199                         return 0;       // a disabled line
 200                 if (count == 2)
 201                         *name = result;
 202                 if (count == 4)
 203                         *type = result;
 204                 if (count == 27)
 205                         *interface = result;
 206                 count++;
 207                 result = strsep(&s, ",");
 208         }
 209
 210         // check other syntax
 211         if (! *name)
 212             return 0;
 213
 214         if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) {
 215                 fprintf(stderr, "Bad connection name: %s\n", *name);
 216                 return 0;
 217         }
 218
 219         if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) {
 220                 fprintf(stderr, "Bad connection type: %s\n", *type);
 221                 return 0;
 222         }
 223
 224         if (! (strcmp(*interface, "RED") == 0 || strcmp(*interface, "GREEN") == 0 ||
 225                 strcmp(*interface, "ORANGE") == 0 || strcmp(*interface, "BLUE") == 0)) {
 226                 fprintf(stderr, "Bad interface name: %s\n", *interface);
 227                 return 0;
 228         }
 229         //it's a valid & active line
 230         return 1;
 231 }
 232
 233 /*
 234     issue ipsec commmands to turn on connection 'name'
 235 */
 236 void turn_connection_on (char *name, char *type) {
 237         char command[STRING_SIZE];
 238
 239         safe_system("/usr/sbin/ipsec auto --rereadsecrets >/dev/null");
 240         memset(command, 0, STRING_SIZE);
 241         snprintf(command, STRING_SIZE - 1,
 242                 "/usr/sbin/ipsec auto --replace %s >/dev/null", name);
 243         safe_system(command);
 244         if (strcmp(type, "net") == 0) {
 245                 memset(command, 0, STRING_SIZE);
 246                 snprintf(command, STRING_SIZE - 1,
 247                 "/usr/sbin/ipsec auto --asynchronous --up %s >/dev/null", name);
 248                 safe_system(command);
 249         }
 250 }
 251 /*
 252     issue ipsec commmands to turn off connection 'name'
 253 */
 254 void turn_connection_off (char *name) {
 255         char command[STRING_SIZE];
 256
 257         memset(command, 0, STRING_SIZE);
 258         snprintf(command, STRING_SIZE - 1,
 259                 "/usr/sbin/ipsec auto --down %s >/dev/null", name);
 260         safe_system(command);
 261         memset(command, 0, STRING_SIZE);
 262         snprintf(command, STRING_SIZE - 1,
 263                 "/usr/sbin/ipsec auto --delete %s >/dev/null", name);
 264         safe_system(command);
 265         safe_system("/usr/sbin/ipsec auto --rereadsecrets >/dev/null");
 266 }
 267
 268
 269 int main(int argc, char *argv[]) {
 270
 271         char configtype[STRING_SIZE];
 272         char redtype[STRING_SIZE] = "";
 273         struct keyvalue *kv = NULL;
 274
 275         if (argc < 2) {
 276                 usage();
 277                 exit(1);
 278         }
 279         if (!(initsetuid()))
 280                 exit(1);
 281
 282         /* FIXME: workaround for pclose() issue - still no real idea why
 283          * this is happening */
 284         signal(SIGCHLD, SIG_DFL);
 285
 286         /* handle operations that doesn't need start the ipsec system */
 287         if (argc == 2) {
 288                 if (strcmp(argv[1], "D") == 0) {
 289                         safe_system("/usr/local/bin/vpn-watch --stop");
 290                         ipsec_norules();
 291                         /* Only shutdown pluto if it really is running */
 292                         int fd;
 293                         /* Get pluto pid */
 294                         if ((fd = open("/var/run/pluto.pid", O_RDONLY)) != -1) {
 295                                 safe_system("/etc/rc.d/ipsec stop 2> /dev/null >/dev/null");
 296                                 close(fd);
 297                         }
 298                         exit(0);
 299                 }
 300
 301                 if (strcmp(argv[1], "R") == 0) {
 302                         safe_system("/usr/sbin/ipsec auto --rereadall");
 303                         exit(0);
 304                 }
 305         }
 306
 307         /* stop the watch script as soon as possible */
 308         safe_system("/usr/local/bin/vpn-watch --stop");
 309
 310         /* clear iptables vpn rules */
 311         ipsec_norules();
 312
 313         /* read vpn config */
 314         kv=initkeyvalues();
 315         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 316         {
 317                 fprintf(stderr, "Cannot read vpn settings\n");
 318                 exit(1);
 319         }
 320
 321         /* check is the vpn system is enabled */
 322         {
 323             char s[STRING_SIZE];
 324             findkey(kv, "ENABLED", s);
 325             freekeyvalues(kv);
 326             if (strcmp (s, "on") != 0)
 327                 exit(0);
 328         }
 329
 330         /* read interface settings */
 331         kv=initkeyvalues();
 332         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 333         {
 334                 fprintf(stderr, "Cannot read ethernet settings\n");
 335                 exit(1);
 336         }
 337         if (!findkey(kv, "CONFIG_TYPE", configtype))
 338         {
 339                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 340                 exit(1);
 341         }
 342         findkey(kv, "RED_TYPE", redtype);
 343
 344
 345         /* Loop through the config file to find physical interface that will accept IPSEC */
 346         int enable_red=0;       // states 0: not used
 347         int enable_green=0;     //        1: error condition
 348         int enable_orange=0;    //        2: good
 349         int enable_blue=0;
 350         char if_red[STRING_SIZE] = "";
 351         char if_green[STRING_SIZE] = "";
 352         char if_orange[STRING_SIZE] = "";
 353         char if_blue[STRING_SIZE] = "";
 354         char s[STRING_SIZE];
 355         FILE *file = NULL;
 356
 357         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 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                 /* search interface */
 369                 if (!enable_red && strcmp (interface, "RED") == 0) {
 370                         // when RED is up, find interface name in special file
 371                         FILE *ifacefile = NULL;
 372                         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 373                             if (fgets(if_red, STRING_SIZE, ifacefile)) {
 374                                 if (if_red[strlen(if_red) - 1] == '\n')
 375                                         if_red[strlen(if_red) - 1] = '\0';
 376                             }
 377                             fclose (ifacefile);
 378
 379                             if (VALID_DEVICE(if_red))
 380                                 enable_red+=2;                  // present and running
 381                         }
 382                 }
 383
 384                 if (!enable_green && strcmp (interface, "GREEN") == 0) {
 385                         enable_green = 1;
 386                         findkey(kv, "GREEN_DEV", if_green);
 387                         if (VALID_DEVICE(if_green))
 388                             enable_green++;
 389                         else
 390                             fprintf(stderr, "IPSec enabled on green but green interface is invalid or not found\n");
 391                 }
 392
 393                 if (!enable_orange && strcmp (interface, "ORANGE") == 0) {
 394                         enable_orange = 1;
 395                         findkey(kv, "ORANGE_DEV", if_orange);
 396                         if (VALID_DEVICE(if_orange))
 397                             enable_orange++;
 398                         else
 399                             fprintf(stderr, "IPSec enabled on orange but orange interface is invalid or not found\n");
 400                 }
 401
 402                 if (!enable_blue && strcmp (interface, "BLUE") == 0) {
 403                         enable_blue++;
 404                         findkey(kv, "BLUE_DEV", if_blue);
 405                         if (VALID_DEVICE(if_blue))
 406                             enable_blue++;
 407                         else
 408                             fprintf(stderr, "IPSec enabled on blue but blue interface is invalid or not found\n");
 409
 410                 }
 411         }
 412         fclose(file);
 413         freekeyvalues(kv);
 414
 415         // do nothing if something is in error condition
 416         if ((enable_red==1) || (enable_green==1) || (enable_orange==1) || (enable_blue==1) )
 417             exit(1);
 418
 419         // exit if nothing to do
 420         if ( (enable_red+enable_green+enable_orange+enable_blue) == 0 )
 421             exit(0);
 422
 423         // open needed ports
 424         // todo: read a nat_t indicator to allow or not openning UDP/4500
 425         if (enable_red==2)
 426                 open_physical(if_red, 4500);
 427
 428         if (enable_green==2)
 429                 open_physical(if_green, 4500);
 430
 431         if (enable_orange==2)
 432                 open_physical(if_orange, 4500);
 433
 434         if (enable_blue==2)
 435                 open_physical(if_blue, 4500);
 436
 437         // then open the ipsecX
 438         open_virtual();
 439
 440         // start the system
 441         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 442                 load_modules();
 443                 safe_system("/usr/sbin/ipsec tncfg --clear >/dev/null");
 444                 safe_system("/etc/rc.d/ipsec restart >/dev/null");
 445                 add_alias_interfaces(configtype, redtype, if_red, (enable_red+enable_green+enable_orange+enable_blue) >>1 );
 446                 safe_system("/usr/local/bin/vpn-watch --start");
 447                 exit(0);
 448         }
 449
 450         // it is a selective start or stop
 451         // second param is only a number 'key'
 452         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 453                 ipsec_norules();
 454                 fprintf(stderr, "Bad arg\n");
 455                 usage();
 456                 exit(1);
 457         }
 458
 459         // search the vpn pointed by 'key'
 460         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 461                 ipsec_norules();
 462                 fprintf(stderr, "Couldn't open vpn settings file");
 463                 exit(1);
 464         }
 465         while (fgets(s, STRING_SIZE, file) != NULL) {
 466                 char *key;
 467                 char *name;
 468                 char *type;
 469                 char *interface;
 470                 if (!decode_line(s,&key,&name,&type,&interface))
 471                         continue;
 472
 473                 // start/stop a vpn if belonging to specified interface
 474                 if (strcmp(argv[1], interface) == 0 ) {
 475                             if (strcmp(argv[2], "0")==0)
 476                                 turn_connection_off (name);
 477                             else
 478                                 turn_connection_on (name, type);
 479                         continue;
 480                 }
 481                 // is it the 'key' requested ?
 482                 if (strcmp(argv[2], key) != 0)
 483                         continue;
 484                 // Start or Delete this Connection
 485                 if (strcmp(argv[1], "S") == 0)
 486                         turn_connection_on (name, type);
 487                 else
 488                 if (strcmp(argv[1], "D") == 0)
 489                         turn_connection_off (name);
 490                 else {
 491                         ipsec_norules();
 492                         fprintf(stderr, "Bad command\n");
 493                         exit(1);
 494                 }
 495         }
 496         fclose(file);
 497         safe_system("/usr/local/bin/vpn-watch --start");
 498         return 0;
 499 }