src/starter/starterstroke.c

   1 /* Stroke for charon is the counterpart to whack from pluto
   2  * Copyright (C) 2006 Martin Willi
   3  * Hochschule fuer Technik Rapperswil
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  *
  15  * RCSID $Id$
  16  */
  17
  18 #include <sys/types.h>
  19 #include <sys/socket.h>
  20 #include <sys/un.h>
  21 #include <stddef.h>
  22 #include <unistd.h>
  23 #include <stdlib.h>
  24 #include <errno.h>
  25 #include <netinet/in.h>
  26 #include <arpa/inet.h>
  27
  28 #include <freeswan.h>
  29
  30 #include <constants.h>
  31 #include <defs.h>
  32 #include <log.h>
  33
  34 #include <stroke_msg.h>
  35
  36 #include "starterstroke.h"
  37 #include "confread.h"
  38 #include "files.h"
  39
  40 /**
  41  * Authentication methods, must be the same as in charons authenticator.h
  42  */
  43 enum auth_method_t {
  44         AUTH_PUBKEY =   1,
  45         AUTH_PSK =              2,
  46         AUTH_EAP =              3
  47 };
  48
  49 static char* push_string(stroke_msg_t *msg, char *string)
  50 {
  51         unsigned long string_start = msg->length;
  52
  53         if (string == NULL || msg->length + strlen(string) >= sizeof(stroke_msg_t))
  54         {
  55                 return NULL;
  56         }
  57         else
  58         {
  59                 msg->length += strlen(string) + 1;
  60                 strcpy((char*)msg + string_start, string);
  61                 return (char*)string_start;
  62         }
  63 }
  64
  65 static int send_stroke_msg (stroke_msg_t *msg)
  66 {
  67         struct sockaddr_un ctl_addr = { AF_UNIX, CHARON_CTL_FILE };
  68         int byte_count;
  69         char buffer[64];
  70
  71         /* starter is not called from commandline, and therefore absolutely silent */
  72         msg->output_verbosity = -1;
  73
  74         int sock = socket(AF_UNIX, SOCK_STREAM, 0);
  75
  76         if (sock < 0)
  77         {
  78                 plog("socket() failed: %s", strerror(errno));
  79                 return -1;
  80         }
  81         if (connect(sock, (struct sockaddr *)&ctl_addr, offsetof(struct sockaddr_un, sun_path) + strlen(ctl_addr.sun_path)) < 0)
  82         {
  83                 plog("connect(charon_ctl) failed: %s", strerror(errno));
  84                 close(sock);
  85                 return -1;
  86         }
  87
  88         /* send message */
  89         if (write(sock, msg, msg->length) != msg->length)
  90         {
  91                 plog("write(charon_ctl) failed: %s", strerror(errno));
  92                 close(sock);
  93                 return -1;
  94         }
  95         while ((byte_count = read(sock, buffer, sizeof(buffer)-1)) > 0)
  96         {
  97                 buffer[byte_count] = '\0';
  98                 plog("%s", buffer);
  99         }
 100         if (byte_count < 0)
 101         {
 102                 plog("read() failed: %s", strerror(errno));
 103         }
 104
 105         close(sock);
 106         return 0;
 107 }
 108
 109 static char* connection_name(starter_conn_t *conn)
 110 {
 111          /* if connection name is '%auto', create a new name like conn_xxxxx */
 112         static char buf[32];
 113
 114         if (streq(conn->name, "%auto"))
 115         {
 116                 sprintf(buf, "conn_%ld", conn->id);
 117                 return buf;
 118         }
 119         return conn->name;
 120 }
 121
 122 static void ip_address2string(ip_address *addr, char *buffer, size_t len)
 123 {
 124         switch (((struct sockaddr*)addr)->sa_family)
 125         {
 126                 case AF_INET:
 127                 {
 128                         struct sockaddr_in* sin = (struct sockaddr_in*)addr;
 129                         if (inet_ntop(AF_INET, &sin->sin_addr, buffer, len))
 130                         {
 131                                 return;
 132                         }
 133                         break;
 134                 }
 135                 case AF_INET6:
 136                 {
 137                         struct sockaddr_in6* sin6 = (struct sockaddr_in6*)addr;
 138                         if (inet_ntop(AF_INET6, &sin6->sin6_addr, buffer, len))
 139                         {
 140                                 return;
 141                         }
 142                         break;
 143                 }
 144                 default:
 145                         break;
 146         }
 147         /* failed */
 148         snprintf(buffer, len, "0.0.0.0");
 149 }
 150
 151
 152 static void starter_stroke_add_end(stroke_msg_t *msg, stroke_end_t *msg_end, starter_end_t *conn_end)
 153 {
 154         char buffer[INET6_ADDRSTRLEN];
 155
 156         msg_end->id = push_string(msg, conn_end->id);
 157         msg_end->cert = push_string(msg, conn_end->cert);
 158         msg_end->ca = push_string(msg, conn_end->ca);
 159         msg_end->groups = push_string(msg, conn_end->groups);
 160         msg_end->updown = push_string(msg, conn_end->updown);
 161         ip_address2string(&conn_end->addr, buffer, sizeof(buffer));
 162         msg_end->address = push_string(msg, buffer);
 163         msg_end->subnets = push_string(msg, conn_end->subnet);
 164         msg_end->sendcert = conn_end->sendcert;
 165         msg_end->hostaccess = conn_end->hostaccess;
 166         msg_end->tohost = !conn_end->has_client;
 167         msg_end->protocol = conn_end->protocol;
 168         msg_end->port = conn_end->port;
 169         if (conn_end->srcip)
 170         {
 171                 if (conn_end->srcip[0] == '%')
 172                 {       /* %poolname, strip % */
 173                         msg_end->sourceip_size = 0;
 174                         msg_end->sourceip = push_string(msg, conn_end->srcip + 1);
 175                 }
 176                 else
 177                 {
 178                         char *pos = strchr(conn_end->srcip, '/');
 179                         if (pos)
 180                         {       /* CIDR subnet definition */
 181                                 snprintf(buffer, pos - conn_end->srcip + 1, "%s", conn_end->srcip);
 182                                 msg_end->sourceip = push_string(msg, buffer);
 183                                 msg_end->sourceip_size = atoi(pos + 1);
 184                         }
 185                         else
 186                         {       /* a single address */
 187                                 msg_end->sourceip = push_string(msg, conn_end->srcip);
 188                                 if (strchr(conn_end->srcip, ':'))
 189                                 {       /* IPv6 */
 190                                         msg_end->sourceip_size = 128;
 191                                 }
 192                                 else
 193                                 {       /* IPv4 */
 194                                         msg_end->sourceip_size = 32;
 195                                 }
 196                         }
 197                 }
 198         }
 199         else if (conn_end->modecfg)
 200         {
 201                 msg_end->sourceip_size = 1;
 202         }
 203 }
 204
 205 int starter_stroke_add_conn(starter_config_t *cfg, starter_conn_t *conn)
 206 {
 207         stroke_msg_t msg;
 208
 209         memset(&msg, 0, sizeof(msg));
 210         msg.type = STR_ADD_CONN;
 211         msg.length = offsetof(stroke_msg_t, buffer);
 212         msg.add_conn.ikev2 = conn->keyexchange == KEY_EXCHANGE_IKEV2;
 213         msg.add_conn.name = push_string(&msg, connection_name(conn));
 214
 215         /* PUBKEY is preferred to PSK and EAP */
 216         if (conn->policy & POLICY_RSASIG || conn->policy & POLICY_ECDSASIG)
 217         {
 218                 msg.add_conn.auth_method = AUTH_PUBKEY;
 219         }
 220         else if (conn->policy & POLICY_PSK)
 221         {
 222                 msg.add_conn.auth_method = AUTH_PSK;
 223         }
 224         else
 225         {
 226                 msg.add_conn.auth_method = AUTH_EAP;
 227         }
 228         msg.add_conn.eap_type = conn->eap_type;
 229         msg.add_conn.eap_vendor = conn->eap_vendor;
 230
 231         if (conn->policy & POLICY_TUNNEL)
 232         {
 233                 msg.add_conn.mode = 1; /* XFRM_MODE_TRANSPORT */
 234         }
 235         else if (conn->policy & POLICY_BEET)
 236         {
 237                 msg.add_conn.mode = 4; /* XFRM_MODE_BEET */
 238         }
 239         else
 240         {
 241                 msg.add_conn.mode = 0; /* XFRM_MODE_TUNNEL */
 242         }
 243
 244         if (!(conn->policy & POLICY_DONT_REKEY))
 245         {
 246                 msg.add_conn.rekey.reauth = (conn->policy & POLICY_DONT_REAUTH) == LEMPTY;
 247                 msg.add_conn.rekey.ipsec_lifetime = conn->sa_ipsec_life_seconds;
 248                 msg.add_conn.rekey.ike_lifetime = conn->sa_ike_life_seconds;
 249                 msg.add_conn.rekey.margin = conn->sa_rekey_margin;
 250                 msg.add_conn.rekey.tries = conn->sa_keying_tries;
 251                 msg.add_conn.rekey.fuzz = conn->sa_rekey_fuzz;
 252         }
 253         msg.add_conn.mobike = conn->policy & POLICY_MOBIKE;
 254         msg.add_conn.force_encap = conn->policy & POLICY_FORCE_ENCAP;
 255         msg.add_conn.ipcomp = conn->policy & POLICY_COMPRESS;
 256         msg.add_conn.crl_policy = cfg->setup.strictcrlpolicy;
 257         msg.add_conn.unique = cfg->setup.uniqueids;
 258         msg.add_conn.algorithms.ike = push_string(&msg, conn->ike);
 259         msg.add_conn.algorithms.esp = push_string(&msg, conn->esp);
 260         msg.add_conn.dpd.delay = conn->dpd_delay;
 261         msg.add_conn.dpd.action = conn->dpd_action;
 262         msg.add_conn.ikeme.mediation = conn->me_mediation;
 263         msg.add_conn.ikeme.mediated_by = push_string(&msg, conn->me_mediated_by);
 264         msg.add_conn.ikeme.peerid = push_string(&msg, conn->me_peerid);
 265
 266         starter_stroke_add_end(&msg, &msg.add_conn.me, &conn->left);
 267         starter_stroke_add_end(&msg, &msg.add_conn.other, &conn->right);
 268
 269         return send_stroke_msg(&msg);
 270 }
 271
 272 int starter_stroke_del_conn(starter_conn_t *conn)
 273 {
 274         stroke_msg_t msg;
 275
 276         msg.type = STR_DEL_CONN;
 277         msg.length = offsetof(stroke_msg_t, buffer);
 278         msg.del_conn.name = push_string(&msg, connection_name(conn));
 279         return send_stroke_msg(&msg);
 280 }
 281
 282 int starter_stroke_route_conn(starter_conn_t *conn)
 283 {
 284         stroke_msg_t msg;
 285
 286         msg.type = STR_ROUTE;
 287         msg.length = offsetof(stroke_msg_t, buffer);
 288         msg.route.name = push_string(&msg, connection_name(conn));
 289         return send_stroke_msg(&msg);
 290 }
 291
 292 int starter_stroke_initiate_conn(starter_conn_t *conn)
 293 {
 294         stroke_msg_t msg;
 295
 296         msg.type = STR_INITIATE;
 297         msg.length = offsetof(stroke_msg_t, buffer);
 298         msg.initiate.name = push_string(&msg, connection_name(conn));
 299         return send_stroke_msg(&msg);
 300 }
 301
 302 int starter_stroke_add_ca(starter_ca_t *ca)
 303 {
 304         stroke_msg_t msg;
 305
 306         msg.type = STR_ADD_CA;
 307         msg.length = offsetof(stroke_msg_t, buffer);
 308         msg.add_ca.name =        push_string(&msg, ca->name);
 309         msg.add_ca.cacert =      push_string(&msg, ca->cacert);
 310         msg.add_ca.crluri =      push_string(&msg, ca->crluri);
 311         msg.add_ca.crluri2 =     push_string(&msg, ca->crluri2);
 312         msg.add_ca.ocspuri =     push_string(&msg, ca->ocspuri);
 313         msg.add_ca.ocspuri2 =    push_string(&msg, ca->ocspuri2);
 314         msg.add_ca.certuribase = push_string(&msg, ca->certuribase);
 315         return send_stroke_msg(&msg);
 316 }
 317
 318 int starter_stroke_del_ca(starter_ca_t *ca)
 319 {
 320         stroke_msg_t msg;
 321
 322         msg.type = STR_DEL_CA;
 323         msg.length = offsetof(stroke_msg_t, buffer);
 324         msg.del_ca.name = push_string(&msg, ca->name);
 325         return send_stroke_msg(&msg);
 326 }
 327
 328 int starter_stroke_configure(starter_config_t *cfg)
 329 {
 330         stroke_msg_t msg;
 331
 332         if (cfg->setup.cachecrls)
 333         {
 334                 msg.type = STR_CONFIG;
 335                 msg.length = offsetof(stroke_msg_t, buffer);
 336                 msg.config.cachecrl = 1;
 337                 return send_stroke_msg(&msg);
 338         }
 339         return 0;
 340 }
 341