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 --dport 500 -j ACCEPT >/dev/null 2>&1", interface);
  63         safe_system(str);
  64         sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --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  return values from the vpn config file or false if not 'on'
  85 */
  86 int decode_line (char *s,
  87                 char **key,
  88                 char **name,
  89                 char **type
  90                 ) {
  91         int count = 0;
  92         *key = NULL;
  93         *name = NULL;
  94         *type = NULL;
  95
  96         if (s[strlen(s) - 1] == '\n')
  97                 s[strlen(s) - 1] = '\0';
  98
  99         char *result = strsep(&s, ",");
 100         while (result) {
 101                 if (count == 0)
 102                         *key = result;
 103                 if ((count == 1) && strcmp(result, "on") != 0)
 104                         return 0;       // a disabled line
 105                 if (count == 2)
 106                         *name = result;
 107                 if (count == 4)
 108                         *type = result;
 109                 count++;
 110                 result = strsep(&s, ",");
 111         }
 112
 113         // check other syntax
 114         if (! *name)
 115             return 0;
 116
 117         if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) {
 118                 fprintf(stderr, "Bad connection name: %s\n", *name);
 119                 return 0;
 120         }
 121
 122         if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) {
 123                 fprintf(stderr, "Bad connection type: %s\n", *type);
 124                 return 0;
 125         }
 126
 127         //it's a valid & active line
 128         return 1;
 129 }
 130
 131 /*
 132     issue ipsec commmands to turn on connection 'name'
 133 */
 134 void turn_connection_on(char *name, char *type) {
 135         /*
 136          * To bring up a connection, we need to reload the configuration
 137          * and issue ipsec up afterwards. To make sure the connection
 138          * is not established from the start, we bring it down in advance.
 139          */
 140         char command[STRING_SIZE];
 141
 142         // Bring down the connection (if established).
 143         snprintf(command, STRING_SIZE - 1,
 144                 "/usr/sbin/ipsec down %s >/dev/null", name);
 145         safe_system(command);
 146
 147         // Reload the configuration into the daemon.
 148         safe_system("/usr/sbin/ipsec reload >/dev/null 2>&1");
 149
 150         // Bring the connection up again.
 151         snprintf(command, STRING_SIZE - 1,
 152                 "/usr/sbin/ipsec up %s >/dev/null", name);
 153         safe_system(command);
 154 }
 155
 156 /*
 157     issue ipsec commmands to turn off connection 'name'
 158 */
 159 void turn_connection_off (char *name) {
 160         /*
 161          * To turn off a connection, all SAs must be turned down.
 162          * After that, the configuration must be reloaded.
 163          */
 164         char command[STRING_SIZE];
 165
 166         // Bring down the connection.
 167         snprintf(command, STRING_SIZE - 1,
 168                 "/usr/sbin/ipsec down %s >/dev/null", name);
 169         safe_system(command);
 170
 171         // Reload, so the connection is dropped.
 172         safe_system("/usr/sbin/ipsec reload >/dev/null 2>&1");
 173 }
 174
 175 int main(int argc, char *argv[]) {
 176         char configtype[STRING_SIZE];
 177         char redtype[STRING_SIZE] = "";
 178         struct keyvalue *kv = NULL;
 179
 180         if (argc < 2) {
 181                 usage();
 182                 exit(1);
 183         }
 184         if (!(initsetuid()))
 185                 exit(1);
 186
 187  FILE *file = NULL;
 188
 189
 190         if (strcmp(argv[1], "I") == 0) {
 191                 safe_system("/usr/sbin/ipsec status");
 192                 exit(0);
 193         }
 194
 195         if (strcmp(argv[1], "R") == 0) {
 196                 safe_system("/usr/sbin/ipsec reload >/dev/null 2>&1");
 197                 exit(0);
 198         }
 199
 200         /* FIXME: workaround for pclose() issue - still no real idea why
 201          * this is happening */
 202         signal(SIGCHLD, SIG_DFL);
 203
 204         /* handle operations that doesn't need start the ipsec system */
 205         if (argc == 2) {
 206                 if (strcmp(argv[1], "D") == 0) {
 207                         safe_system("/usr/sbin/ipsec stop >/dev/null 2>&1");
 208                         ipsec_norules();
 209                         exit(0);
 210                 }
 211         }
 212
 213         /* read vpn config */
 214         kv=initkeyvalues();
 215         if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
 216         {
 217                 fprintf(stderr, "Cannot read vpn settings\n");
 218                 exit(1);
 219         }
 220
 221         /* check is the vpn system is enabled */
 222         {
 223             char s[STRING_SIZE];
 224             findkey(kv, "ENABLED", s);
 225             freekeyvalues(kv);
 226             if (strcmp (s, "on") != 0)
 227                 exit(0);
 228         }
 229
 230         /* read interface settings */
 231         kv=initkeyvalues();
 232         if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
 233         {
 234                 fprintf(stderr, "Cannot read ethernet settings\n");
 235                 exit(1);
 236         }
 237         if (!findkey(kv, "CONFIG_TYPE", configtype))
 238         {
 239                 fprintf(stderr, "Cannot read CONFIG_TYPE\n");
 240                 exit(1);
 241         }
 242         findkey(kv, "RED_TYPE", redtype);
 243
 244
 245         /* Loop through the config file to find physical interface that will accept IPSEC */
 246         int enable_red=0;       // states 0: not used
 247         int enable_green=0;     //        1: error condition
 248         int enable_orange=0;    //        2: good
 249         int enable_blue=0;
 250         char if_red[STRING_SIZE] = "";
 251         char if_green[STRING_SIZE] = "";
 252         char if_orange[STRING_SIZE] = "";
 253         char if_blue[STRING_SIZE] = "";
 254         char s[STRING_SIZE];
 255
 256         // when RED is up, find interface name in special file
 257         FILE *ifacefile = NULL;
 258         if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
 259                 if (fgets(if_red, STRING_SIZE, ifacefile)) {
 260                         if (if_red[strlen(if_red) - 1] == '\n')
 261                                 if_red[strlen(if_red) - 1] = '\0';
 262                 }
 263                 fclose (ifacefile);
 264
 265                 if (VALID_DEVICE(if_red))
 266                         enable_red++;
 267         }
 268
 269         // Check if GREEN is enabled.
 270         findkey(kv, "GREEN_DEV", if_green);
 271         if (VALID_DEVICE(if_green))
 272                 enable_green++;
 273
 274         // Check if ORANGE is enabled.
 275         findkey(kv, "ORANGE_DEV", if_orange);
 276         if (VALID_DEVICE(if_orange))
 277                 enable_orange++;
 278
 279         // Check if BLUE is enabled.
 280         findkey(kv, "BLUE_DEV", if_blue);
 281         if (VALID_DEVICE(if_blue))
 282                 enable_blue++;
 283
 284         freekeyvalues(kv);
 285
 286         // exit if nothing to do
 287         if ((enable_red+enable_green+enable_orange+enable_blue) == 0)
 288             exit(0);
 289
 290         // open needed ports
 291         if (enable_red > 0)
 292                 open_physical(if_red, 4500);
 293
 294         if (enable_green > 0)
 295                 open_physical(if_green, 4500);
 296
 297         if (enable_orange > 0)
 298                 open_physical(if_orange, 4500);
 299
 300         if (enable_blue > 0)
 301                 open_physical(if_blue, 4500);
 302
 303         // start the system
 304         if ((argc == 2) && strcmp(argv[1], "S") == 0) {
 305                 safe_system("/usr/sbin/ipsec restart >/dev/null");
 306                 exit(0);
 307         }
 308
 309         // it is a selective start or stop
 310         // second param is only a number 'key'
 311         if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
 312                 fprintf(stderr, "Bad arg: %s\n", argv[2]);
 313                 usage();
 314                 exit(1);
 315         }
 316
 317         // search the vpn pointed by 'key'
 318         if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
 319                 fprintf(stderr, "Couldn't open vpn settings file");
 320                 exit(1);
 321         }
 322         while (fgets(s, STRING_SIZE, file) != NULL) {
 323                 char *key;
 324                 char *name;
 325                 char *type;
 326                 if (!decode_line(s,&key,&name,&type))
 327                         continue;
 328
 329                 // is it the 'key' requested ?
 330                 if (strcmp(argv[2], key) != 0)
 331                         continue;
 332
 333                 // Start or Delete this Connection
 334                 if (strcmp(argv[1], "S") == 0)
 335                         turn_connection_on (name, type);
 336                 else if (strcmp(argv[1], "D") == 0)
 337                         turn_connection_off (name);
 338                 else {
 339                         fprintf(stderr, "Bad command\n");
 340                         exit(1);
 341                 }
 342         }
 343         fclose(file);
 344
 345         return 0;
 346 }