/*
protocol.c -- handle the meta-protocol
- Copyright (C) 1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 1999-2001 Ivo Timmermans <itimmermans@bigfoot.com>,
+ 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: protocol.c,v 1.28 2000/05/30 21:36:16 zarq Exp $
+ $Id: protocol.c,v 1.28.4.77 2001/02/06 10:12:51 guus Exp $
*/
#include "config.h"
#include <sys/socket.h>
#include <unistd.h>
#include <stdio.h>
+#include <stdarg.h>
#include <utils.h>
#include <xalloc.h>
+#include <avl_tree.h>
+#include <list.h>
+
+#include <netinet/in.h>
+
+#ifdef HAVE_OPENSSL_SHA_H
+# include <openssl/sha.h>
+#else
+# include <sha.h>
+#endif
+
+#ifdef HAVE_OPENSSL_RAND_H
+# include <openssl/rand.h>
+#else
+# include <rand.h>
+#endif
+
+#ifdef HAVE_OPENSSL_EVP_H
+# include <openssl/evp.h>
+#else
+# include <evp.h>
+#endif
+
#include "conf.h"
-#include "encr.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
+#include "meta.h"
+#include "connection.h"
#include "system.h"
-char buffer[MAXBUFSIZE+1];
-int buflen;
+int check_id(char *id)
+{
+ int i;
-/* Outgoing request routines */
+ for (i = 0; i < strlen(id); i++)
+ if(!isalnum(id[i]) && id[i] != '_')
+ return -1;
+
+ return 0;
+}
-int send_ack(conn_list_t *cl)
+/* Generic request routines - takes care of logging and error
+ detection as well */
+
+int send_request(connection_t *cl, const char *format, ...)
{
+ va_list args;
+ char buffer[MAXBUFSIZE];
+ int len, request;
+
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send ACK to %s"), cl->hostname);
+ /* Use vsnprintf instead of vasprintf: faster, no memory
+ fragmentation, cleanup is automatic, and there is a limit on the
+ input buffer anyway */
- buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", ACK);
+ va_start(args, format);
+ len = vsnprintf(buffer, MAXBUFSIZE, format, args);
+ request = va_arg(args, int);
+ va_end(args);
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(len < 0 || len > MAXBUFSIZE-1)
{
- syslog(LOG_ERR, _("send failed: %d:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Output buffer overflow while sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
return -1;
}
- syslog(LOG_NOTICE, _("Connection with %s activated."), cl->hostname);
+ len++;
+
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
+
cp
- return 0;
+ return send_meta(cl, buffer, len);
}
-int send_termreq(conn_list_t *cl)
+int receive_request(connection_t *cl)
{
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send TERMREQ to " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
+ int request;
+cp
+ if(sscanf(cl->buffer, "%d", &request) == 1)
+ {
+ if((request < 0) || (request > 255) || (request_handlers[request] == NULL))
+ {
+ syslog(LOG_ERR, _("Unknown request from %s (%s)"),
+ cl->name, cl->hostname);
+ return -1;
+ }
+ else
+ {
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
+ request_name[request], cl->name, cl->hostname);
+ }
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", TERMREQ, myself->vpn_ip);
+ if((cl->allow_request != ALL) && (cl->allow_request != request))
+ {
+ syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
- if(write(cl->meta_socket, buffer, buflen) < 0)
+ if(request_handlers[request](cl))
+ /* Something went wrong. Probably scriptkiddies. Terminate. */
+ {
+ syslog(LOG_ERR, _("Error while processing %s from %s (%s)"),
+ request_name[request], cl->name, cl->hostname);
+ return -1;
+ }
+ }
+ else
{
- if(debug_lvl > 1)
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
+ cl->name, cl->hostname);
return -1;
}
cp
return 0;
}
-int send_timeout(conn_list_t *cl)
+/* Connection protocol:
+
+ Client Server
+ send_id(u)
+ send_challenge(R)
+ send_chal_reply(H)
+ send_id(u)
+ send_challenge(R)
+ send_chal_reply(H)
+ ---------------------------------------
+ send_metakey(R)
+ send_metakey(R)
+ ---------------------------------------
+ send_ack(u)
+ send_ack(u)
+ ---------------------------------------
+ Other requests(E)...
+
+ (u) Unencrypted,
+ (R) RSA,
+ (H) SHA1,
+ (E) Encrypted with symmetric cipher.
+
+ Part of the challenge is directly used to set the symmetric cipher
+ key and the initial vector. Since a man-in-the-middle cannot
+ decrypt the RSA challenges, this means that he cannot get or forge
+ the key for the symmetric cipher.
+*/
+
+int send_id(connection_t *cl)
+{
+cp
+ cl->allow_request = CHALLENGE;
+cp
+ return send_request(cl, "%d %s %d %lx %hd", ID, myself->name, myself->protocol_version, myself->options, myself->port);
+}
+
+int id_h(connection_t *cl)
{
+ connection_t *old;
+ unsigned short int port;
+ char name[MAX_STRING_SIZE];
+ avl_node_t *node;
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send TIMEOUT to " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
+ if(sscanf(cl->buffer, "%*d "MAX_STRING" %d %lx %hd", name, &cl->protocol_version, &cl->options, &port) != 4)
+ {
+ syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname);
+ return -1;
+ }
+
+ /* Check if version matches */
+
+ if(cl->protocol_version != myself->protocol_version)
+ {
+ syslog(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"),
+ cl->name, cl->hostname, cl->protocol_version);
+ return -1;
+ }
+
+ /* Check if identity is a valid name */
+
+ if(check_id(name))
+ {
+ syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname);
+ return -1;
+ }
+
+ /* Copy string to cl */
+
+ cl->name = xstrdup(name);
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", PINGTIMEOUT, myself->vpn_ip);
+ /* Load information about peer */
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(read_host_config(cl))
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->name);
return -1;
}
+
+ /* First check if the host we connected to is already in our
+ connection list. If so, we are probably making a loop, which
+ is not desirable.
+ */
+
+ if(cl->status.outgoing)
+ {
+ if((old = lookup_id(cl->name)))
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"), cl->name, cl->hostname);
+ cl->status.outgoing = 0;
+ old->status.outgoing = 1;
+ terminate_connection(cl);
+ return 0;
+ }
+ }
+
+ /* Now we can add the name to the id tree */
+
+ id_add(cl);
+
+ /* And uhr... cl->port just changed so we have to unlink it from the connection tree and re-insert... */
+
+ node = avl_unlink(connection_tree, cl);
+ cl->port = port;
+ avl_insert_node(connection_tree, node);
+
+ /* Read in the public key, so that we can send a challenge */
+
+ if(read_rsa_public_key(cl))
+ return -1;
+
cp
- return 0;
+ return send_challenge(cl);
}
-int send_del_host(conn_list_t *cl, conn_list_t *new_host)
+int send_challenge(connection_t *cl)
{
+ char *buffer;
+ int len, x;
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending delete host " IP_ADDR_S " to " IP_ADDR_S),
- IP_ADDR_V(new_host->vpn_ip), IP_ADDR_V(cl->vpn_ip));
+ len = RSA_size(cl->rsa_key);
+
+ /* Allocate buffers for the challenge */
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", DEL_HOST, new_host->vpn_ip);
+ buffer = xmalloc(len*2+1);
+
+ if(cl->hischallenge)
+ free(cl->hischallenge);
+
+ cl->hischallenge = xmalloc(len);
+cp
+ /* Copy random data to the buffer */
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ RAND_bytes(cl->hischallenge, len);
+
+ cl->hischallenge[0] &= 0x7F; /* Somehow if the first byte is more than 0xD0 or something like that, decryption fails... */
+cp
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ bin2hex(cl->hischallenge, buffer, len);
+ buffer[len*2] = '\0';
+ syslog(LOG_DEBUG, _("Generated random challenge (unencrypted): %s"), buffer);
+ }
+
+ /* Encrypt the random data */
+
+ if(RSA_public_encrypt(len, cl->hischallenge, buffer, cl->rsa_key, RSA_NO_PADDING) != len) /* NO_PADDING because the message size equals the RSA key size and it is totally random */
+ {
+ syslog(LOG_ERR, _("Error during encryption of challenge for %s (%s)"), cl->name, cl->hostname);
+ free(buffer);
return -1;
}
cp
- return 0;
+ /* Convert the encrypted random data to a hexadecimal formatted string */
+
+ bin2hex(buffer, buffer, len);
+ buffer[len*2] = '\0';
+cp
+ /* Send the challenge */
+
+ cl->allow_request = CHAL_REPLY;
+ x = send_request(cl, "%d %s", CHALLENGE, buffer);
+ free(buffer);
+cp
+ return x;
}
-int send_ping(conn_list_t *cl)
+int challenge_h(connection_t *cl)
{
+ char buffer[MAX_STRING_SIZE];
+ int len;
cp
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("pinging " IP_ADDR_S), IP_ADDR_V(cl->vpn_ip));
+ if(sscanf(cl->buffer, "%*d "MAX_STRING, buffer) != 1)
+ {
+ syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
- buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PING);
+ len = RSA_size(myself->rsa_key);
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ /* Check if the length of the challenge is all right */
+
+ if(strlen(buffer) != len*2)
+ {
+ syslog(LOG_ERR, _("Intruder: wrong challenge length from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
+
+ /* Allocate buffers for the challenge */
+
+ if(!cl->mychallenge)
+ cl->mychallenge = xmalloc(len);
+
+ /* Convert the challenge from hexadecimal back to binary */
+
+ hex2bin(buffer,buffer,len);
+
+ /* Decrypt the challenge */
+
+ if(RSA_private_decrypt(len, buffer, cl->mychallenge, myself->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Error during encryption of challenge for %s (%s)"), cl->name, cl->hostname);
return -1;
}
+
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ {
+ bin2hex(cl->mychallenge, buffer, len);
+ buffer[len*2] = '\0';
+ syslog(LOG_DEBUG, _("Received random challenge (unencrypted): %s"), buffer);
+ }
+
+ /* Rest is done by send_chal_reply() */
cp
- return 0;
+ return send_chal_reply(cl);
}
-int send_pong(conn_list_t *cl)
+int send_chal_reply(connection_t *cl)
{
+ char hash[SHA_DIGEST_LENGTH*2+1];
cp
- buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PONG);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(!cl->mychallenge)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Trying to send CHAL_REPLY to %s (%s) without a valid CHALLENGE"), cl->name, cl->hostname);
return -1;
}
+
+ /* Calculate the hash from the challenge we received */
+
+ SHA1(cl->mychallenge, RSA_size(myself->rsa_key), hash);
+
+ /* Convert the hash to a hexadecimal formatted string */
+
+ bin2hex(hash,hash,SHA_DIGEST_LENGTH);
+ hash[SHA_DIGEST_LENGTH*2] = '\0';
+
+ /* Send the reply */
+
+ if(cl->status.outgoing)
+ cl->allow_request = ID;
+ else
+ cl->allow_request = METAKEY;
+
cp
- return 0;
+ return send_request(cl, "%d %s", CHAL_REPLY, hash);
}
-int send_add_host(conn_list_t *cl, conn_list_t *new_host)
+int chal_reply_h(connection_t *cl)
{
+ char hishash[MAX_STRING_SIZE];
+ char myhash[SHA_DIGEST_LENGTH];
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending add host to " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
+ if(sscanf(cl->buffer, "%*d "MAX_STRING, hishash) != 1)
+ {
+ syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx/%lx:%x\n", ADD_HOST, new_host->real_ip, new_host->vpn_ip, new_host->vpn_mask, new_host->port);
+ /* Check if the length of the hash is all right */
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(strlen(hishash) != SHA_DIGEST_LENGTH*2)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->name, cl->hostname);
return -1;
}
-cp
- return 0;
-}
-int send_key_changed(conn_list_t *cl, conn_list_t *src)
-{
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending KEY_CHANGED to " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
+ /* Convert the hash to binary format */
+
+ hex2bin(hishash, hishash, SHA_DIGEST_LENGTH);
+
+ /* Calculate the hash from the challenge we sent */
+
+ SHA1(cl->hischallenge, RSA_size(cl->rsa_key), myhash);
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", KEY_CHANGED, src->vpn_ip);
+ /* Verify the incoming hash with the calculated hash */
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(memcmp(hishash, myhash, SHA_DIGEST_LENGTH))
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname);
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ {
+ bin2hex(myhash, hishash, SHA_DIGEST_LENGTH);
+ hishash[SHA_DIGEST_LENGTH*2] = '\0';
+ syslog(LOG_DEBUG, _("Expected challenge reply: %s"), hishash);
+ }
return -1;
}
+
+
+ /* Identity has now been positively verified.
+ If we are accepting this new connection, then send our identity,
+ if we are making this connecting, acknowledge.
+ */
cp
- return 0;
+ if(cl->status.outgoing)
+ return send_metakey(cl);
+ else
+ return send_id(cl);
}
-void send_key_changed_all(void)
+int send_metakey(connection_t *cl)
{
- conn_list_t *p;
+ char *buffer;
+ int len, x;
cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p->status.meta && p->status.active)
- send_key_changed(p, myself);
-cp
-}
+ len = RSA_size(cl->rsa_key);
-int send_basic_info(conn_list_t *cl)
-{
+ /* Allocate buffers for the meta key */
+
+ buffer = xmalloc(len*2+1);
+
+ if(!cl->cipher_outkey)
+ cl->cipher_outkey = xmalloc(len);
+
+ if(!cl->cipher_outctx)
+ cl->cipher_outctx = xmalloc(sizeof(*cl->cipher_outctx));
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send BASIC_INFO to " IP_ADDR_S),
- IP_ADDR_V(cl->real_ip));
+ /* Copy random data to the buffer */
+
+ RAND_bytes(cl->cipher_outkey, len);
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %d %lx/%lx:%x\n", BASIC_INFO, PROT_CURRENT, myself->vpn_ip, myself->vpn_mask, myself->port);
+ cl->cipher_outkey[0] &= 0x7F; /* FIXME: Somehow if the first byte is more than 0xD0 or something like that, decryption fails... */
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ bin2hex(cl->cipher_outkey, buffer, len);
+ buffer[len*2] = '\0';
+ syslog(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"), buffer);
+ }
+
+ /* Encrypt the random data */
+
+ if(RSA_public_encrypt(len, cl->cipher_outkey, buffer, cl->rsa_key, RSA_NO_PADDING) != len) /* NO_PADDING because the message size equals the RSA key size and it is totally random */
+ {
+ syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), cl->name, cl->hostname);
+ free(buffer);
return -1;
}
cp
- return 0;
+ /* Convert the encrypted random data to a hexadecimal formatted string */
+
+ bin2hex(buffer, buffer, len);
+ buffer[len*2] = '\0';
+
+ /* Send the meta key */
+
+ if(cl->status.outgoing)
+ cl->allow_request = METAKEY;
+ else
+ cl->allow_request = ACK;
+
+ x = send_request(cl, "%d %s", METAKEY, buffer);
+ free(buffer);
+
+ EVP_EncryptInit(cl->cipher_outctx, EVP_bf_cfb(), cl->cipher_outkey, cl->cipher_outkey + EVP_bf_cfb()->key_len);
+cp
+ return x;
}
-int send_passphrase(conn_list_t *cl)
+int metakey_h(connection_t *cl)
{
- passphrase_t tmp;
+ char buffer[MAX_STRING_SIZE];
+ int len;
cp
- encrypt_passphrase(&tmp);
+ if(sscanf(cl->buffer, "%*d "MAX_STRING, buffer) != 1)
+ {
+ syslog(LOG_ERR, _("Got bad METAKEY from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send PASSPHRASE %s to " IP_ADDR_S),
- tmp.phrase, IP_ADDR_V(cl->vpn_ip));
+ len = RSA_size(myself->rsa_key);
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PASSPHRASE, tmp.phrase);
+ /* Check if the length of the meta key is all right */
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(strlen(buffer) != len*2)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Intruder: wrong meta key length from %s (%s)"), cl->name, cl->hostname);
return -1;
}
-cp
- return 0;
-}
-int send_public_key(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send PUBLIC_KEY %s to " IP_ADDR_S),
- my_public_key_base36, IP_ADDR_V(cl->vpn_ip));
+ /* Allocate buffers for the meta key */
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PUBLIC_KEY, my_public_key_base36);
+ if(!cl->cipher_inkey)
+ cl->cipher_inkey = xmalloc(len);
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(!cl->cipher_inctx)
+ cl->cipher_inctx = xmalloc(sizeof(*cl->cipher_inctx));
+
+ /* Convert the challenge from hexadecimal back to binary */
+
+ hex2bin(buffer,buffer,len);
+
+ /* Decrypt the meta key */
+
+ if(RSA_private_decrypt(len, buffer, cl->cipher_inkey, myself->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), cl->name, cl->hostname);
return -1;
}
+
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ {
+ bin2hex(cl->cipher_inkey, buffer, len);
+ buffer[len*2] = '\0';
+ syslog(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), buffer);
+ }
+
+ EVP_DecryptInit(cl->cipher_inctx, EVP_bf_cfb(), cl->cipher_inkey, cl->cipher_inkey + EVP_bf_cfb()->key_len);
+
cp
- return 0;
+ if(cl->status.outgoing)
+ return send_ack(cl);
+ else
+ return send_metakey(cl);
}
-int send_calculate(conn_list_t *cl, char *k)
+int send_ack(connection_t *cl)
{
+ int x;
cp
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", CALCULATE, k);
+ if(cl->status.outgoing)
+ cl->allow_request = ACK;
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
+ x = send_request(cl, "%d", ACK);
+ cl->status.encryptout = 1;
cp
- return 0;
+ return x;
}
-int send_key_request(ip_t to)
+int ack_h(connection_t *cl)
{
- conn_list_t *fw;
+ config_t const *cfg;
+ connection_t *old, *p;
+ subnet_t *subnet;
+ avl_node_t *node, *node2;
cp
- fw = lookup_conn(to);
- if(!fw)
+ /* Okay, before we active the connection, we check if there is another entry
+ in the connection list with the same name. If so, it presumably is an
+ old connection that has timed out but we don't know it yet.
+ */
+
+ while((old = lookup_id(cl->name)))
{
- syslog(LOG_ERR, _("Attempting to send key request to " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(to));
- return -1;
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
+ cl->name, old->hostname, cl->hostname);
+
+ terminate_connection(old);
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending out request for public key to " IP_ADDR_S),
- IP_ADDR_V(fw->nexthop->vpn_ip));
+ /* Activate this connection */
+
+ cl->allow_request = ALL;
+ cl->status.active = 1;
+ cl->status.decryptin = 1;
+ cl->nexthop = cl;
+ cl->cipher_pkttype = EVP_bf_cfb();
+ cl->cipher_pktkeylength = cl->cipher_pkttype->key_len + cl->cipher_pkttype->iv_len;
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx\n", REQ_KEY, to, myself->vpn_ip);
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
- if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0)
+cp
+ if(!cl->status.outgoing)
+ send_ack(cl);
+
+ /* Check some options */
+
+ if((cfg = get_config_val(cl->config, config_indirectdata)))
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
+ if(cfg->data.val == stupid_true)
+ cl->options |= OPTION_INDIRECT;
+ }
+
+ if((cfg = get_config_val(cl->config, config_tcponly)))
+ {
+ if(cfg->data.val == stupid_true)
+ cl->options |= OPTION_TCPONLY;
}
- fw->status.waitingforkey = 1;
+
+ /* Send him our subnets */
+
+ for(node = myself->subnet_tree->head; node; node = node->next)
+ {
+ subnet = (subnet_t *)node->data;
+ send_add_subnet(cl, subnet);
+ }
+ /* And send him all the hosts and their subnets we know... */
+
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ p = (connection_t *)node->data;
+
+ if(p != cl && p->status.active)
+ {
+ /* Notify others of this connection */
+
+ if(p->status.meta)
+ send_add_host(p, cl);
+
+ /* Notify new connection of everything we know */
+
+ send_add_host(cl, p);
+
+ for(node2 = p->subnet_tree->head; node2; node2 = node2->next)
+ {
+ subnet = (subnet_t *)node2->data;
+ send_add_subnet(cl, subnet);
+ }
+ }
+ }
cp
return 0;
}
-int send_key_answer(conn_list_t *cl, ip_t to)
+/* Address and subnet information exchange */
+
+int send_add_subnet(connection_t *cl, subnet_t *subnet)
{
- conn_list_t *fw;
+ int x;
+ char *netstr;
+ char *owner;
cp
+ if(cl->options & OPTION_INDIRECT)
+ owner = myself->name;
+ else
+ owner = subnet->owner->name;
- fw = lookup_conn(to);
-
- if(!fw)
+ x = send_request(cl, "%d %s %s", ADD_SUBNET,
+ owner, netstr = net2str(subnet));
+ free(netstr);
+cp
+ return x;
+}
+
+int add_subnet_h(connection_t *cl)
+{
+ char subnetstr[MAX_STRING_SIZE];
+ char name[MAX_STRING_SIZE];
+ connection_t *owner, *p;
+ subnet_t *subnet;
+ avl_node_t *node;
+cp
+ if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2)
+ {
+ syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
+
+ /* Check if owner name is a valid */
+
+ if(check_id(name))
+ {
+ syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
+ return -1;
+ }
+
+ /* Check if subnet string is valid */
+
+ if(!(subnet = str2net(subnetstr)))
{
- syslog(LOG_ERR, _("Attempting to send key answer to " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(to));
+ syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
return -1;
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending public key to " IP_ADDR_S),
- IP_ADDR_V(fw->nexthop->vpn_ip));
+ /* Check if somebody tries to add a subnet of ourself */
+
+ if(!strcmp(name, myself->name))
+ {
+ syslog(LOG_ERR, _("Warning: got ADD_SUBNET from %s (%s) for ourself, restarting"),
+ cl->name, cl->hostname);
+ sighup = 1;
+ return 0;
+ }
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx %d %s\n", ANS_KEY, to, myself->vpn_ip, my_key_expiry, my_public_key_base36);
+ /* Check if the owner of the new subnet is in the connection list */
- if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0)
+ if(!(owner = lookup_id(name)))
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Got ADD_SUBNET for %s from %s (%s) which is not in our connection list"),
+ name, cl->name, cl->hostname);
return -1;
}
+
+ /* If everything is correct, add the subnet to the list of the owner */
+
+ subnet_add(owner, subnet);
+
+ /* Tell the rest */
+
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ p = (connection_t *)node->data;
+ if(p->status.meta && p->status.active && p!= cl)
+ send_add_subnet(p, subnet);
+ }
cp
return 0;
}
-/*
- notify all my direct connections of a new host
- that was added to the vpn, with the exception
- of the source of the announcement.
-*/
-int notify_others(conn_list_t *new, conn_list_t *source,
- int (*function)(conn_list_t*, conn_list_t*))
+int send_del_subnet(connection_t *cl, subnet_t *subnet)
{
- conn_list_t *p;
+ int x;
+ char *netstr;
+ char *owner;
cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p != new && p != source && p->status.meta && p->status.active)
- function(p, new);
+ if(cl->options & OPTION_INDIRECT)
+ owner = myself->name;
+ else
+ owner = subnet->owner->name;
+
+ x = send_request(cl, "%d %s %s", DEL_SUBNET, owner, netstr = net2str(subnet));
+ free(netstr);
cp
- return 0;
+ return x;
}
-/*
- notify one connection of everything
- i have connected
-*/
-int notify_one(conn_list_t *new)
+int del_subnet_h(connection_t *cl)
{
- conn_list_t *p;
+ char subnetstr[MAX_STRING_SIZE];
+ char name[MAX_STRING_SIZE];
+ connection_t *owner, *p;
+ subnet_t *subnet;
+ avl_node_t *node;
cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p != new && p->status.active)
- send_add_host(new, p);
-cp
- return 0;
-}
+ if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 3)
+ {
+ syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
-/*
- The incoming request handlers
-*/
+ /* Check if owner name is a valid */
-int basic_info_h(conn_list_t *cl)
-{
-cp
- if(sscanf(cl->buffer, "%*d %d %lx/%lx:%hx", &cl->protocol_version, &cl->vpn_ip, &cl->vpn_mask, &cl->port) != 4)
+ if(check_id(name))
{
- syslog(LOG_ERR, _("got bad BASIC_INFO request: %s"), cl->buffer);
- return -1;
- }
+ syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
+ return -1;
+ }
+
+ /* Check if subnet string is valid */
- if(cl->protocol_version != PROT_CURRENT)
+ if(!(subnet = str2net(subnetstr)))
{
- syslog(LOG_ERR, _("Peer uses incompatible protocol version %d."),
- cl->protocol_version);
+ syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
return -1;
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got BASIC_INFO(%hd," IP_ADDR_S "," IP_ADDR_S ")"), cl->port,
- IP_ADDR_V(cl->vpn_ip), IP_ADDR_V(cl->vpn_mask));
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Peer uses protocol version %d"),
- cl->protocol_version);
+ free(subnetstr);
+
+ /* Check if somebody tries to add a subnet of ourself */
- if(cl->status.outgoing)
+ if(!strcmp(name, myself->name))
{
- if(setup_vpn_connection(cl) < 0)
- return -1;
- send_basic_info(cl);
+ syslog(LOG_ERR, _("Warning: got DEL_SUBNET from %s (%s) for ourself, restarting"),
+ cl->name, cl->hostname);
+ sighup = 1;
+ return 0;
}
- else
+
+ /* Check if the owner of the new subnet is in the connection list */
+
+ if(!(owner = lookup_id(name)))
{
- if(setup_vpn_connection(cl) < 0)
- return -1;
- send_passphrase(cl);
+ syslog(LOG_ERR, _("Got DEL_SUBNET for %s from %s (%s) which is not in our connection list"),
+ name, cl->name, cl->hostname);
+ return -1;
+ }
+
+ /* If everything is correct, delete the subnet from the list of the owner */
+
+ subnet_del(subnet);
+
+ /* Tell the rest */
+
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ p = (connection_t *)node->data;
+ if(p->status.meta && p->status.active && p!= cl)
+ send_del_subnet(p, subnet);
}
cp
return 0;
}
-int passphrase_h(conn_list_t *cl)
+/* New and closed connections notification */
+
+int send_add_host(connection_t *cl, connection_t *other)
+{
+cp
+ if(!(cl->options & OPTION_INDIRECT))
+ return send_request(cl, "%d %s %lx:%d %lx", ADD_HOST,
+ other->name, other->address, other->port, other->options);
+}
+
+int add_host_h(connection_t *cl)
{
+ connection_t *old, *new, *p;
+ char name[MAX_STRING_SIZE];
+ avl_node_t *node;
cp
- cl->pp = xmalloc(sizeof(*(cl->pp)));
+ new = new_connection();
+
+ if(sscanf(cl->buffer, "%*d "MAX_STRING" %lx:%d %lx", name, &new->address, &new->port, &new->options) != 4)
+ {
+ syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
- if(sscanf(cl->buffer, "%*d %as", &(cl->pp->phrase)) != 1)
+ /* Check if identity is a valid name */
+
+ if(check_id(name))
{
- syslog(LOG_ERR, _("got bad PASSPHRASE request: %s"), cl->buffer);
+ syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
+ free_connection(new);
return -1;
}
- cl->pp->len = strlen(cl->pp->phrase);
+
+ /* Check if somebody tries to add ourself */
+
+ if(!strcmp(name, myself->name))
+ {
+ syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"), cl->name, cl->hostname);
+ sighup = 1;
+ free_connection(new);
+ return 0;
+ }
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got PASSPHRASE"));
+ /* Fill in more of the new connection structure */
- if(cl->status.outgoing)
- send_passphrase(cl);
- else
- send_public_key(cl);
+ new->hostname = hostlookup(htonl(new->address));
+
+ /* Check if the new host already exists in the connnection list */
+
+ if((old = lookup_id(name)))
+ {
+ if((new->address == old->address) && (new->port == old->port))
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"),
+ old->name, old->hostname, name, new->hostname);
+ free_connection(new);
+ return 0;
+ }
+ else
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Removing old entry for %s (%s) in favour of new connection"),
+ old->name, old->hostname);
+
+ terminate_connection(old);
+ }
+ }
+
+ /* Hook it up into the connection */
+
+ new->name = xstrdup(name);
+ connection_add(new);
+ id_add(new);
+
+ /* Tell the rest about the new host */
+
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ p = (connection_t *)node->data;
+ if(p->status.meta && p->status.active && p!=cl)
+ send_add_host(p, new);
+ }
+
+ /* Fill in rest of connection structure */
+
+ new->nexthop = cl;
+ new->status.active = 1;
+ new->cipher_pkttype = EVP_bf_cfb();
+ new->cipher_pktkeylength = cl->cipher_pkttype->key_len + cl->cipher_pkttype->iv_len;
cp
return 0;
}
-int public_key_h(conn_list_t *cl)
+int send_del_host(connection_t *cl, connection_t *other)
{
- char *g_n;
- conn_list_t *old;
cp
- if(sscanf(cl->buffer, "%*d %as", &g_n) != 1)
+ if(!(cl->options & OPTION_INDIRECT))
+ return send_request(cl, "%d %s %lx:%d %lx", DEL_HOST,
+ other->name, other->address, other->port, other->options);
+}
+
+int del_host_h(connection_t *cl)
+{
+ char name[MAX_STRING_SIZE];
+ ip_t address;
+ port_t port;
+ long int options;
+ connection_t *old, *p;
+ avl_node_t *node;
+cp
+ if(sscanf(cl->buffer, "%*d "MAX_STRING" %lx:%d %lx", name, &address, &port, &options) != 4)
{
- syslog(LOG_ERR, _("got bad PUBLIC_KEY request: %s"), cl->buffer);
- return -1;
- }
+ syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"),
+ cl->name, cl->hostname);
+ return -1;
+ }
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got PUBLIC_KEY %s"), g_n);
+ /* Check if identity is a valid name */
- if(verify_passphrase(cl, g_n))
+ if(check_id(name))
{
- /* intruder! */
- syslog(LOG_ERR, _("Intruder: passphrase does not match."));
+ syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
return -1;
}
- if(debug_lvl > 2)
- syslog(LOG_INFO, _("Passphrase OK"));
+ /* Check if somebody tries to delete ourself */
- if(cl->status.outgoing)
- send_public_key(cl);
- else
+ if(!strcmp(name, myself->name))
{
- send_ack(cl);
+ syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"),
+ cl->name, cl->hostname);
+ sighup = 1;
+ return 0;
+ }
- /* Okay, before we active the connection, we check if there is another entry
- in the connection list with the same vpn_ip. If so, it presumably is an
- old connection that has timed out but we don't know it yet. Because our
- conn_list entry is not active, lookup_conn will skip ourself. */
+ /* Check if the new host already exists in the connnection list */
- while(old=lookup_conn(cl->vpn_ip))
- terminate_connection(old);
+ if(!(old = lookup_id(name)))
+ {
+ syslog(LOG_ERR, _("Got DEL_HOST from %s (%s) for %s which is not in our connection list"),
+ name, cl->name, cl->hostname);
+ return -1;
+ }
+
+ /* Check if the rest matches */
+
+ if(address!=old->address || port!=old->port || options!=old->options || cl!=old->nexthop)
+ {
+ syslog(LOG_WARNING, _("Got DEL_HOST from %s (%s) for %s which doesn't match"), cl->name, cl->hostname, old->name);
+ return 0;
+ }
+
+ /* Ok, since EVERYTHING seems to check out all right, delete it */
- cl->status.active = 1;
- notify_others(cl, NULL, send_add_host);
- notify_one(cl);
+ old->status.active = 0;
+ terminate_connection(old);
+
+ /* Tell the rest about the new host */
+
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ p = (connection_t *)node->data;
+ if(p->status.meta && p->status.active && p!=cl)
+ send_del_host(p, old);
}
cp
return 0;
}
-int ack_h(conn_list_t *cl)
+/* Status and error notification routines */
+
+int send_status(connection_t *cl, int statusno, char *statusstring)
{
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got ACK"));
-
- cl->status.active = 1;
- syslog(LOG_NOTICE, _("Connection with %s activated."), cl->hostname);
+ if(!statusstring)
+ statusstring = status_text[statusno];
cp
- return 0;
+ return send_request(cl, "%d %d %s", STATUS, statusno, statusstring);
}
-int termreq_h(conn_list_t *cl)
+int status_h(connection_t *cl)
{
+ int statusno;
+ char statusstring[MAX_STRING_SIZE];
cp
- syslog(LOG_NOTICE, _(IP_ADDR_S " wants to quit"), IP_ADDR_V(cl->vpn_ip));
- cl->status.termreq = 1;
- terminate_connection(cl);
+ if(sscanf(cl->buffer, "%*d %d "MAX_STRING, &statusno, statusstring) != 2)
+ {
+ syslog(LOG_ERR, _("Got bad STATUS from %s (%s)"),
+ cl->name, cl->hostname);
+ return -1;
+ }
+
+ if(debug_lvl >= DEBUG_STATUS)
+ {
+ syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"),
+ cl->name, cl->hostname, status_text[statusno], statusstring);
+ }
- notify_others(cl, NULL, send_del_host);
cp
return 0;
}
-int timeout_h(conn_list_t *cl)
+int send_error(connection_t *cl, int err, char *errstring)
{
cp
- if(!cl->status.active) return -1;
- syslog(LOG_NOTICE, _(IP_ADDR_S " says it's gotten a timeout from us"), IP_ADDR_V(cl->vpn_ip));
- cl->status.termreq = 1;
- terminate_connection(cl);
-cp
- return 0;
+ if(!errstring)
+ errstring = strerror(err);
+ return send_request(cl, "%d %d %s", ERROR, err, errstring);
}
-int del_host_h(conn_list_t *cl)
+int error_h(connection_t *cl)
{
- ip_t vpn_ip;
- conn_list_t *fw;
+ int errno;
+ char errorstring[MAX_STRING_SIZE];
cp
- if(!cl->status.active) return -1;
-
- if(sscanf(cl->buffer, "%*d %lx", &vpn_ip) != 1)
+ if(sscanf(cl->buffer, "%*d %d "MAX_STRING, &errno, errorstring) != 2)
{
- syslog(LOG_ERR, _("got bad DEL_HOST request: %s"), cl->buffer);
+ syslog(LOG_ERR, _("Got bad ERROR from %s (%s)"),
+ cl->name, cl->hostname);
return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got DEL_HOST for " IP_ADDR_S),
- IP_ADDR_V(vpn_ip));
+ }
- if(!(fw = lookup_conn(vpn_ip)))
+ if(debug_lvl >= DEBUG_ERROR)
{
- syslog(LOG_ERR, _("Somebody wanted to delete " IP_ADDR_S " which does not exist?"),
- IP_ADDR_V(vpn_ip));
- return 0;
+ syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"),
+ cl->name, cl->hostname, strerror(errno), errorstring);
}
- notify_others(cl, fw, send_del_host);
-
- fw->status.termreq = 1;
- terminate_connection(fw);
+ terminate_connection(cl);
cp
return 0;
}
-int ping_h(conn_list_t *cl)
+int send_termreq(connection_t *cl)
{
cp
- if(!cl->status.active) return -1;
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("responding to ping from " IP_ADDR_S), IP_ADDR_V(cl->vpn_ip));
- cl->status.pinged = 0;
- cl->status.got_pong = 1;
+ return send_request(cl, "%d", TERMREQ);
+}
- send_pong(cl);
+int termreq_h(connection_t *cl)
+{
+cp
+ terminate_connection(cl);
cp
return 0;
}
-int pong_h(conn_list_t *cl)
+int send_ping(connection_t *cl)
{
cp
- if(!cl->status.active) return -1;
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("ok, got pong from " IP_ADDR_S), IP_ADDR_V(cl->vpn_ip));
- cl->status.got_pong = 1;
+ cl->status.pinged = 1;
+ cl->last_ping_time = time(NULL);
cp
- return 0;
+ return send_request(cl, "%d", PING);
}
-int add_host_h(conn_list_t *cl)
+int ping_h(connection_t *cl)
{
- ip_t real_ip;
- ip_t vpn_ip;
- ip_t vpn_mask;
- unsigned short port;
- conn_list_t *ncn, *fw;
cp
- if(!cl->status.active)
- return -1;
- if(sscanf(cl->buffer, "%*d %lx %lx/%lx:%hx", &real_ip, &vpn_ip, &vpn_mask, &port) != 4)
- {
- syslog(LOG_ERR, _("got bad ADD_HOST request: %s"), cl->buffer);
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Add host request from " IP_ADDR_S), IP_ADDR_V(cl->vpn_ip));
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("got ADD_HOST(" IP_ADDR_S "," IP_ADDR_S ",%hd)"),
- IP_ADDR_V(vpn_ip), IP_ADDR_V(vpn_mask), port);
+ return send_pong(cl);
+}
- /*
- Suggestion of Hans Bayle
- */
- if((fw = lookup_conn(vpn_ip)))
- {
- if(fw->nexthop == cl)
- notify_others(fw, cl, send_add_host);
- else
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Invalid add_host request from " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
- return 0;
- }
+int send_pong(connection_t *cl)
+{
+cp
+ return send_request(cl, "%d", PONG);
+}
- ncn = new_conn_list();
- ncn->real_ip = real_ip;
- ncn->vpn_ip = vpn_ip;
- ncn->vpn_mask = vpn_mask;
- ncn->port = port;
- ncn->hostname = hostlookup(real_ip);
- ncn->nexthop = cl;
- ncn->next = conn_list;
- conn_list = ncn;
- ncn->status.active = 1;
- notify_others(ncn, cl, send_add_host);
+int pong_h(connection_t *cl)
+{
+cp
+ cl->status.pinged = 0;
cp
return 0;
}
-int req_key_h(conn_list_t *cl)
+/* Key exchange */
+
+int send_key_changed(connection_t *from, connection_t *cl)
{
- ip_t to;
- ip_t from;
- conn_list_t *fw;
+ connection_t *p;
+ avl_node_t *node;
cp
- if(!cl->status.active) return -1;
- if(sscanf(cl->buffer, "%*d %lx %lx", &to, &from) != 2)
+ for(node = connection_tree->head; node; node = node->next)
{
- syslog(LOG_ERR, _("got bad request: %s"), cl->buffer);
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got REQ_KEY from " IP_ADDR_S " for " IP_ADDR_S),
- IP_ADDR_V(from), IP_ADDR_V(to));
-
- if((to & myself->vpn_mask) == (myself->vpn_ip & myself->vpn_mask))
- { /* hey! they want something from ME! :) */
- send_key_answer(cl, from);
- return 0;
+ p = (connection_t *)node->data;
+ if(p != cl && p->status.meta && p->status.active)
+ if(!(p->options & OPTION_INDIRECT) || from == myself)
+ send_request(p, "%d %s", KEY_CHANGED, from->name);
}
+cp
+ return 0;
+}
- fw = lookup_conn(to);
-
- if(!fw)
+int key_changed_h(connection_t *cl)
+{
+ char from_id[MAX_STRING_SIZE];
+ connection_t *from;
+cp
+ if(sscanf(cl->buffer, "%*d "MAX_STRING, from_id) != 1)
{
- syslog(LOG_ERR, _("Attempting to forward key request to " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(to));
+ syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"),
+ cl->name, cl->hostname);
return -1;
}
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("Forwarding request for public key to " IP_ADDR_S),
- IP_ADDR_V(fw->nexthop->vpn_ip));
-
- cl->buffer[cl->reqlen-1] = '\n';
-
- if(write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen) < 0)
+ if(!(from = lookup_id(from_id)))
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Got KEY_CHANGED from %s (%s) origin %s which does not exist in our connection list"),
+ cl->name, cl->hostname, from_id);
return -1;
}
+
+ from->status.validkey = 0;
+ from->status.waitingforkey = 0;
+
+ send_key_changed(from, cl);
cp
return 0;
}
-void set_keys(conn_list_t *cl, int expiry, char *key)
+int send_req_key(connection_t *from, connection_t *to)
{
- char *ek;
-cp
- if(!cl->public_key)
- {
- cl->public_key = xmalloc(sizeof(*cl->key));
- cl->public_key->key = NULL;
- }
-
- if(cl->public_key->key)
- free(cl->public_key->key);
- cl->public_key->length = strlen(key);
- cl->public_key->expiry = expiry;
- cl->public_key->key = xmalloc(cl->public_key->length + 1);
- strcpy(cl->public_key->key, key);
-
- ek = make_shared_key(key);
-
- if(!cl->key)
- {
- cl->key = xmalloc(sizeof(*cl->key));
- cl->key->key = NULL;
- }
-
- if(cl->key->key)
- free(cl->key->key);
-
- cl->key->length = strlen(ek);
- cl->key->expiry = expiry;
- cl->key->key = xmalloc(cl->key->length + 1);
- strcpy(cl->key->key, ek);
cp
+ return send_request(to->nexthop, "%d %s %s", REQ_KEY,
+ from->name, to->name);
}
-int ans_key_h(conn_list_t *cl)
+int req_key_h(connection_t *cl)
{
- ip_t to;
- ip_t from;
- int expiry;
- char *key;
- conn_list_t *fw, *gk;
+ char from_id[MAX_STRING_SIZE];
+ char to_id[MAX_STRING_SIZE];
+ connection_t *from, *to;
+ char pktkey[129];
cp
- if(!cl->status.active) return -1;
- if(sscanf(cl->buffer, "%*d %lx %lx %d %as", &to, &from, &expiry, &key) != 4)
+ if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, from_id, to_id) != 2)
{
- syslog(LOG_ERR, _("got bad ANS_KEY request: %s"), cl->buffer);
+ syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"),
+ cl->name, cl->hostname);
return -1;
- }
+ }
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("got ANS_KEY from " IP_ADDR_S " for " IP_ADDR_S),
- IP_ADDR_V(from), IP_ADDR_V(to));
+ if(!(from = lookup_id(from_id)))
+ {
+ syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) origin %s which does not exist in our connection list"),
+ cl->name, cl->hostname, from_id);
+ return -1;
+ }
- if(to == myself->vpn_ip)
- { /* hey! that key's for ME! :) */
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Yeah! key arrived. Now do something with it."));
- gk = lookup_conn(from);
+ /* Check if this key request is for us */
- if(!gk)
+ if(!strcmp(to_id, myself->name))
+ {
+ bin2hex(myself->cipher_pktkey, pktkey, myself->cipher_pktkeylength);
+ pktkey[myself->cipher_pktkeylength*2] = '\0';
+ send_ans_key(myself, from, pktkey);
+ }
+ else
+ {
+ if(!(to = lookup_id(to_id)))
{
- syslog(LOG_ERR, _("Receiving key from " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(from));
+ syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) destination %s which does not exist in our connection list"),
+ cl->name, cl->hostname, to_id);
return -1;
}
+
+ if(to->status.validkey) /* Proxy keys */
+ {
+ bin2hex(to->cipher_pktkey, pktkey, to->cipher_pktkeylength);
+ pktkey[to->cipher_pktkeylength*2] = '\0';
+ send_ans_key(to, from, pktkey);
+ }
+ else
+ send_req_key(from, to);
+ }
- set_keys(gk, expiry, key);
- gk->status.validkey = 1;
- gk->status.waitingforkey = 0;
- flush_queues(gk);
- return 0;
+cp
+ return 0;
+}
+
+int send_ans_key(connection_t *from, connection_t *to, char *pktkey)
+{
+cp
+ return send_request(to->nexthop, "%d %s %s %s", ANS_KEY,
+ from->name, to->name, pktkey);
+}
+
+int ans_key_h(connection_t *cl)
+{
+ char from_id[MAX_STRING_SIZE];
+ char to_id[MAX_STRING_SIZE];
+ char pktkey[MAX_STRING_SIZE];
+ int keylength;
+ connection_t *from, *to;
+cp
+ if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING, from_id, to_id, pktkey) != 3)
+ {
+ syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"),
+ cl->name, cl->hostname);
+ return -1;
}
- fw = lookup_conn(to);
-
- if(!fw)
+ if(!(from = lookup_id(from_id)))
{
- syslog(LOG_ERR, _("Attempting to forward key to " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(to));
+ syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) origin %s which does not exist in our connection list"),
+ cl->name, cl->hostname, from_id);
return -1;
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Forwarding public key to " IP_ADDR_S),
- IP_ADDR_V(fw->nexthop->vpn_ip));
+ /* Check correctness of packet key */
- cl->buffer[cl->reqlen-1] = '\n';
+ keylength = strlen(pktkey);
- if((write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen)) < 0)
+ if(keylength != from->cipher_pktkeylength*2)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key length"),
+ cl->name, cl->hostname, from->name);
return -1;
}
+
+ /* Forward it if necessary */
+
+ if(strcmp(to_id, myself->name))
+ {
+ if(!(to = lookup_id(to_id)))
+ {
+ syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) destination %s which does not exist in our connection list"),
+ cl->name, cl->hostname, to_id);
+ return -1;
+ }
+ send_ans_key(from, to, pktkey);
+ }
+
+ /* Update our copy of the origin's packet key */
+
+ if(from->cipher_pktkey)
+ free(from->cipher_pktkey);
+
+ from->cipher_pktkey = xstrdup(pktkey);
+ keylength /= 2;
+ hex2bin(from->cipher_pktkey, from->cipher_pktkey, keylength);
+ from->cipher_pktkey[keylength] = '\0';
+
+ from->status.validkey = 1;
+ from->status.waitingforkey = 0;
+
+ flush_queue(from);
cp
return 0;
}
-int key_changed_h(conn_list_t *cl)
+int send_tcppacket(connection_t *cl, vpn_packet_t *packet)
{
- ip_t from;
- conn_list_t *ik;
-cp
- if(!cl->status.active) return -1;
- if(sscanf(cl->buffer, "%*d %lx", &from) != 1)
- {
- syslog(LOG_ERR, _("got bad ANS_KEY request: %s"), cl->buffer);
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got KEY_CHANGED from " IP_ADDR_S),
- IP_ADDR_V(from));
+ int x;
+
+ x = send_request(cl->nexthop, "%d %hd", PACKET, packet->len);
- ik = lookup_conn(from);
+ if(x)
+ return x;
+
+ return send_meta(cl->nexthop, packet->data, packet->len);
+}
- if(!ik)
+int tcppacket_h(connection_t *cl)
+{
+ vpn_packet_t packet;
+ char *p;
+ int todo, x;
+
+ if(sscanf(cl->buffer, "%*d %hd", packet.len) != 1)
{
- syslog(LOG_ERR, _("Got changed key from " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(from));
+ syslog(LOG_ERR, _("Got bad PACKET from %s (%s)"), cl->name, cl->hostname);
return -1;
}
- ik->status.validkey = 0;
- ik->status.waitingforkey = 0;
+ /* Evil hack. */
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("Forwarding key invalidation request"));
+ p = packet.data;
+ todo = packet.len;
+
+ while(todo)
+ {
+ x = read(cl->meta_socket, p, todo);
+ if(x<0)
+ {
+ syslog(LOG_ERR, _("Error during reception of PACKET from %s (%s): %m"), cl->name, cl->hostname);
+ return -1;
+ }
+
+ todo -= x;
+ p += x;
+ }
- notify_others(cl, ik, send_key_changed);
-cp
- return 0;
+ return receive_packet(cl, &packet);
}
-int (*request_handlers[256])(conn_list_t*) = {
- 0, ack_h, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- termreq_h, timeout_h, del_host_h, 0, 0, 0, 0, 0, 0, 0,
- ping_h, pong_h, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- add_host_h, basic_info_h, passphrase_h, public_key_h, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- req_key_h, ans_key_h, key_changed_h, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+/* Jumptable for the request handlers */
+
+int (*request_handlers[])(connection_t*) = {
+ id_h, challenge_h, chal_reply_h, metakey_h, ack_h,
+ status_h, error_h, termreq_h,
+ ping_h, pong_h,
+ add_host_h, del_host_h,
+ add_subnet_h, del_subnet_h,
+ key_changed_h, req_key_h, ans_key_h,
+ tcppacket_h,
+};
+
+/* Request names */
+
+char (*request_name[]) = {
+ "ID", "CHALLENGE", "CHAL_REPLY", "METAKEY", "ACK",
+ "STATUS", "ERROR", "TERMREQ",
+ "PING", "PONG",
+ "ADD_HOST", "DEL_HOST",
+ "ADD_SUBNET", "DEL_SUBNET",
+ "KEY_CHANGED", "REQ_KEY", "ANS_KEY",
+ "PACKET",
+};
+
+/* Status strings */
+
+char (*status_text[]) = {
+ "Warning",
+};
+
+/* Error strings */
+
+char (*error_text[]) = {
+ "Error",
};
projects / tinc / blobdiff