- Updated authentication scheme.
- Removed all trailing spaces from all lines. - Added things to add_ and del_subnet_h.
This commit is contained in:
Guus Sliepen
parent
84f210edd9
commit
5d0b3516d5
1 changed files with 199 additions and 101 deletions
300
src/protocol.c
300
src/protocol.c
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@ -17,7 +17,7 @@
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: protocol.c,v 1.28.4.32 2000/09/15 12:58:40 zarq Exp $
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$Id: protocol.c,v 1.28.4.33 2000/09/17 21:42:05 guus Exp $
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*/
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#include "config.h"
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@ -53,9 +53,9 @@ int check_id(char *id)
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for (i = 0; i < strlen(id); i++)
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{
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if(!isalpha(id[i]) && id[i] != '_')
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{
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return 0;
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}
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{
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return 0;
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}
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}
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return 1;
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@ -66,26 +66,29 @@ int check_id(char *id)
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int send_request(conn_list_t *cl, const char *format, int request, /*args*/ ...)
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{
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va_list args;
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char *buffer = NULL;
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char buffer[MAXBUFSIZE+1];
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int len;
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cp
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if(debug_lvl >= DEBUG_PROTOCOL)
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syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
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/* Use vsnprintf instead of vasprintf: faster, no memory fragmentation, cleanup is automatic,
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and there is a limit on the input buffer anyway */
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va_start(args, request);
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len = vasprintf(&buffer, format, args);
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len = vsnprintf(buffer, MAXBUFSIZE+1, format, args);
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va_end(args);
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if(len < 0 || !buffer)
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if(len < 0 || len > MAXBUFSIZE)
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{
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syslog(LOG_ERR, _("Error during vasprintf(): %m"));
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syslog(LOG_ERR, _("Output buffer overflow while sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
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return -1;
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}
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if(debug_lvl >= DEBUG_META)
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syslog(LOG_DEBUG, _("Sending meta data to %s (%s): %s"),
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cl->name, cl->hostname, buffer);
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syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request],
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cl->name, cl->hostname, buffer);
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else if(debug_lvl >= DEBUG_PROTOCOL)
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syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
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if(cl->status.encryptin)
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{
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@ -97,7 +100,7 @@ cp
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syslog(LOG_ERR, _("Sending meta data failed: %m"));
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return -1;
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}
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cp
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cp
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}
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/* Connection protocol:
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@ -105,27 +108,34 @@ cp
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Client Server
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send_id(u)
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send_challenge(R)
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send_chal_reply(BH)
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send_id(B)
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send_challenge(BR)
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send_chal_reply(BH)
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send_ack(B)
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send_ack(B)
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send_chal_reply(H)
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send_id(u)
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send_challenge(R)
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send_chal_reply(H)
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---------------------------------------
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Any negotations about the meta protocol
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encryption go here(u).
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---------------------------------------
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send_ack(u)
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send_ack(u)
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---------------------------------------
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Other requests(E)...
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(u) Unencrypted,
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(R) RSA,
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(H) SHA1,
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(B) Blowfish.
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(E) Encrypted with symmetric cipher.
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Part of the challenge is directly used to set the blowfish key and the initial vector.
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(Twee vliegen in één klap!)
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*/
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Part of the challenge is directly used to set the symmetric cipher key and the initial vector.
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Since a man-in-the-middle cannot decrypt the RSA challenges, this means that he cannot get or
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forge the key for the symmetric cipher.
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*/
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int send_id(conn_list_t *cl)
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{
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cp
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return send_request(cl, "%d %s %d %s", ID,
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myself->name, myself->protocol_version, opt2str(myself->options));
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myself->name, myself->protocol_version, opt2str(myself->options));
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}
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int id_h(conn_list_t *cl)
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@ -138,34 +148,34 @@ cp
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syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname);
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return -1;
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}
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/* Check if version matches */
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if(cl->protocol_version != myself->protocol_version)
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{
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syslog(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"),
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cl->name, cl->hostname, cl->protocol_version);
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cl->name, cl->hostname, cl->protocol_version);
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return -1;
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}
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/* Check if option string is valid */
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if((cl->options = str2opt(options)) == -1)
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{
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syslog(LOG_ERR, _("Peer %s uses invalid option string"), cl->hostname);
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return -1;
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}
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/* Check if identity is a valid name */
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if(!check_id(cl->name))
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{
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syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname);
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return -1;
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}
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/* Load information about peer */
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if(!read_id(cl))
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{
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syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->name);
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@ -206,20 +216,20 @@ int send_challenge(conn_list_t *cl)
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cp
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if(cl->chal_answer)
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free(cl->chal_answer);
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/* Allocate buffers for the challenge and the hash */
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cl->chal_answer = xmalloc(SHA_DIGEST_LENGTH);
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keylength = BN_num_bytes(cl->rsakey->length);
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buffer = xmalloc(keylength*2);
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/* Copy random data and the public key to the buffer */
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RAND_bytes(buffer, keylength);
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BN_bn2bin(cl->rsakey->length, buffer+keylength);
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/* If we don't have a blowfish key set yet, use the random data from the challenge to do so. */
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if(!cl->status.encryptin)
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{
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set_metakey(cl, buffer, keylength);
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@ -235,7 +245,7 @@ cp
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buffer[keylength*2] = '\0';
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/* Send the challenge */
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cl->allow_request = CHAL_REPLY;
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x = send_request(cl, "%d %s", CHALLENGE, buffer);
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free(buffer);
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@ -248,7 +258,7 @@ int challenge_h(conn_list_t *cl)
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{
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char *challenge;
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int x;
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cp
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if(sscanf(cl->buffer, "%*d %as", &cl->name, &challenge) != 1)
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{
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@ -257,7 +267,7 @@ cp
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}
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/* Rest is done by send_chal_reply() */
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x = send_chal_reply(cl, challenge);
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free(challenge);
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cp
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@ -270,7 +280,7 @@ int send_chal_reply(conn_list_t *cl, char *challenge)
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int keylength;
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char *hash;
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int x;
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cp
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keylength = BN_num_bytes(myself->rsakey->length);
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@ -283,21 +293,21 @@ cp
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}
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/* Allocate buffers for the challenge and the hash */
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buffer = xmalloc(keylength*2);
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hash = xmalloc(SHA_DIGEST_LENGTH*2+1);
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/* Copy the incoming random data and our public key to the buffer */
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hex2bin(challenge, buffer, keylength);
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hex2bin(challenge, buffer, keylength);
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BN_bn2bin(myself->rsakey->length, buffer+keylength);
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/* Calculate the hash from that */
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SHA1(buffer, keylength*2, hash);
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/* If we don't have a blowfish key set yet, use the random data from the challenge to do so. */
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if(!cl->status.encrypted)
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{
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set_metakey(cl, buffer, keylength);
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@ -322,7 +332,7 @@ cp
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free(hash);
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cp
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return x;
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}
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}
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int chal_reply_h(conn_list_t *cl)
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{
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@ -335,19 +345,19 @@ cp
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}
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/* Check if the length of the hash is all right */
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if(strlen(hash) != SHA_DIGEST_LENGTH*2)
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{
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syslog(LOG_ERR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->name, cl->hostname);
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return -1;
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}
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/* Convert the hash to binary format */
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hex2bin(hash, hash, SHA_DIGEST_LENGTH);
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/* Verify the incoming hash with the calculated hash */
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if(!memcmp(hash, cl->chal_answer, SHA_DIGEST_LENGTH))
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{
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syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname);
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@ -358,7 +368,7 @@ cp
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If we are accepting this new connection, then send our identity,
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if we are making this connecting, acknowledge.
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*/
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free(hash);
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free(cl->chal_answer);
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@ -384,14 +394,14 @@ cp
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int ack_h(conn_list_t *cl)
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{
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conn_list_t *old;
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cp
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/* Okay, before we active the connection, we check if there is another entry
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in the connection list with the same vpn_ip. If so, it presumably is an
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old connection that has timed out but we don't know it yet.
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*/
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while((old = lookup_id(cl->name)))
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while((old = lookup_id(cl->name)))
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{
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if(debug_lvl > DEBUG_CONNECTIONS)
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syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
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@ -427,14 +437,58 @@ cp
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int send_add_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
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{
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cp
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/* return send_request(cl, "%d %s %d %s", ADD_SUBNET,
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other->name, subnet->type, net2str(subnet)); */
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return send_request(cl, "%d %s %s", ADD_SUBNET,
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other->name, net2str(subnet));
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other->name, net2str(subnet));
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}
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int add_subnet_h(conn_list_t *cl)
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{
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char *subnetstr;
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char *name;
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conn_list_t *owner;
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subnet_t *subnet, *old;
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cp
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if(sscanf(cl->buffer, "%*d %as %as", &name, &subnetstr) != 3)
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{
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syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s)"), cl->name, cl->hostname);
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return -1;
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}
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/* Check if owner name is a valid */
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if(!check_id(name))
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{
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syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
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return -1;
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}
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/* Check if subnet string is valid */
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if((subnet = str2net(subnetstr)) == -1)
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{
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syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
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return -1;
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}
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/* Check if somebody tries to add a subnet of ourself */
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if(!strcmp(name, myself->name))
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{
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syslog(LOG_ERR, _("Warning: got ADD_SUBNET from %s (%s) for ourself, restarting"),
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cl->name, cl->hostname);
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sighup = 1;
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return 0;
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}
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/* Check if the owner of the new subnet is in the connection list */
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if(!(owner = lookup_id(name))
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{
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syslog(LOG_NOTICE, _("Got ADD_SUBNET for %s from %s (%s) which is not in our connection list"),
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name, cl->name, cl->hostname);
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}
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}
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int send_del_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
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@ -445,6 +499,50 @@ cp
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int del_subnet_h(conn_list_t *cl)
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{
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char *subnetstr;
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char *name;
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conn_list_t *owner;
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subnet_t *subnet, *old;
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cp
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if(sscanf(cl->buffer, "%*d %as %as", &name, &subnetstr) != 3)
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{
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syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s)"), cl->name, cl->hostname);
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return -1;
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}
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/* Check if owner name is a valid */
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if(!check_id(name))
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{
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syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
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return -1;
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}
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/* Check if subnet string is valid */
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if((subnet = str2net(subnetstr)) == -1)
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{
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syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
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return -1;
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}
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/* Check if somebody tries to delete a subnet of ourself */
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if(!strcmp(name, myself->name))
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{
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syslog(LOG_ERR, _("Warning: got DEL_SUBNET from %s (%s) for ourself, restarting"),
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cl->name, cl->hostname);
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sighup = 1;
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return 0;
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}
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/* Check if the owner of the new subnet is in the connection list */
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if(!(owner = lookup_id(name))
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{
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syslog(LOG_NOTICE, _("Got DEL_SUBNET for %s from %s (%s) which is not in our connection list"),
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name, cl->name, cl->hostname);
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}
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}
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/* New and closed connections notification */
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@ -466,10 +564,10 @@ cp
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{
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syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s)"), cl->name, cl->hostname);
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return -1;
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}
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}
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/* Check if option string is valid */
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if((new->options = str2opt(options)) == -1)
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{
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syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid option string"), cl->name, cl->hostname);
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@ -477,15 +575,15 @@ cp
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}
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/* Check if identity is a valid name */
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if(!check_id(new->name))
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{
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syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
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return -1;
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}
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/* Check if somebody tries to add ourself */
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if(!strcmp(new->name, myself->name))
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{
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syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"), cl->name, cl->hostname);
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@ -496,7 +594,7 @@ cp
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/* Fill in more of the new conn_list structure */
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new->hostname = hostlookup(htonl(new->real_ip));
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/* Check if the new host already exists in the connnection list */
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if((old = lookup_id(new->name)))
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@ -505,14 +603,14 @@ cp
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{
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if(debug_lvl > DEBUG_CONNECTIONS)
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syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"),
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old->name, old->hostname, new->name, new->hostname);
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return 0;
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old->name, old->hostname, new->name, new->hostname);
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return 0;
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}
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else
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{
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if(debug_lvl > DEBUG_CONNECTIONS)
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syslog(LOG_NOTICE, _("Removing old entry for %s (%s)"),
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old->name, old->hostname);
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old->name, old->hostname);
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old->status.active = 0;
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terminate_connection(old);
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}
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@ -522,15 +620,15 @@ cp
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new->nexthop = cl;
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new->status.active = 1;
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/* Hook it up into the conn_list */
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conn_list_add(conn_list, new);
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/* Tell the rest about the new host */
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notify_others(new, cl, send_add_host);
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cp
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return 0;
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}
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|
|
@ -539,7 +637,7 @@ int send_del_host(conn_list_t *cl, conn_list_t *other)
|
|||
{
|
||||
cp
|
||||
return send_request(cl, "%d %s %lx:%d", DEL_HOST,
|
||||
other->name, other->real_ip, other->port);
|
||||
other->name, other->real_ip, other->port);
|
||||
}
|
||||
|
||||
int del_host_h(conn_list_t *cl)
|
||||
|
|
@ -548,21 +646,21 @@ int del_host_h(conn_list_t *cl)
|
|||
ip_t address;
|
||||
port_t port;
|
||||
conn_list_t *old;
|
||||
|
||||
|
||||
cp
|
||||
if(sscanf(cl->buffer, "%*d %as %lx:%d", &id, &address, &port) != 3)
|
||||
{
|
||||
syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"),
|
||||
cl->name, cl->hostname);
|
||||
cl->name, cl->hostname);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
/* Check if somebody tries to delete ourself */
|
||||
|
||||
|
||||
if(!strcmp(id, myself->name))
|
||||
{
|
||||
syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"),
|
||||
cl->name, cl->hostname);
|
||||
cl->name, cl->hostname);
|
||||
sighup = 1;
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -587,7 +685,7 @@ cp
|
|||
if(debug_lvl > DEBUG_CONNECTIONS)
|
||||
{
|
||||
syslog(LOG_NOTICE, _("Got DEL_HOST for %s from %s (%s) which is not in our connection list"),
|
||||
id, cl->name, cl->hostname);
|
||||
id, cl->name, cl->hostname);
|
||||
}
|
||||
cp
|
||||
return 0;
|
||||
|
|
@ -612,14 +710,14 @@ cp
|
|||
if(sscanf(cl->buffer, "%*d %d %as", &statusno, &statusstring) != 2)
|
||||
{
|
||||
syslog(LOG_ERR, _("Got bad STATUS from %s (%s)"),
|
||||
cl->name, cl->hostname);
|
||||
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);
|
||||
cl->name, cl->hostname, status_text[statusno], statusstring);
|
||||
}
|
||||
|
||||
cp
|
||||
|
|
@ -643,14 +741,14 @@ cp
|
|||
if(sscanf(cl->buffer, "%*d %d %as", &errno, &errorstring) != 2)
|
||||
{
|
||||
syslog(LOG_ERR, _("Got bad error from %s (%s)"),
|
||||
cl->name, cl->hostname);
|
||||
cl->name, cl->hostname);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if(debug_lvl > DEBUG_error)
|
||||
{
|
||||
syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"),
|
||||
cl->name, cl->hostname, strerror(errno), errorstring);
|
||||
cl->name, cl->hostname, strerror(errno), errorstring);
|
||||
}
|
||||
|
||||
free(errorstring);
|
||||
|
|
@ -714,7 +812,7 @@ cp
|
|||
{
|
||||
if(p!=cl && p->status.meta && p->status.active)
|
||||
send_request(p, "%d %s", KEY_CHANGED,
|
||||
from->name);
|
||||
from->name);
|
||||
}
|
||||
cp
|
||||
return 0;
|
||||
|
|
@ -728,33 +826,33 @@ cp
|
|||
if(sscanf(cl->buffer, "%*d %as", &from_id) != 1)
|
||||
{
|
||||
syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"),
|
||||
cl->name, cl->hostname);
|
||||
cl->name, cl->hostname);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
if(!(from = lookup_id(from_id)))
|
||||
{
|
||||
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);
|
||||
cl->name, cl->hostname, from_id);
|
||||
free(from_id);
|
||||
return -1;
|
||||
}
|
||||
|
||||
free(from_id);
|
||||
|
||||
|
||||
from->status.validkey = 0;
|
||||
from->status.waitingforkey = 0;
|
||||
|
||||
|
||||
send_key_changed(from, cl);
|
||||
cp
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int send_req_key(conn_list_t *from, conn_list_t *to)
|
||||
{
|
||||
cp
|
||||
return send_request(to->nexthop, "%d %s %s", REQ_KEY,
|
||||
from->name, to->name);
|
||||
from->name, to->name);
|
||||
}
|
||||
|
||||
int req_key_h(conn_list_t *cl)
|
||||
|
|
@ -765,14 +863,14 @@ cp
|
|||
if(sscanf(cl->buffer, "%*d %as %as", &from_id, &to_id) != 2)
|
||||
{
|
||||
syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"),
|
||||
cl->name, cl->hostname);
|
||||
cl->name, cl->hostname);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
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);
|
||||
cl->name, cl->hostname, from_id);
|
||||
free(from_id); free(to_id);
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -788,7 +886,7 @@ cp
|
|||
if(!(to = lookup_id(to_id)))
|
||||
{
|
||||
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);
|
||||
cl->name, cl->hostname, to_id);
|
||||
free(from_id); free(to_id);
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -804,7 +902,7 @@ int send_ans_key(conn_list_t *from, conn_list_t *to, char *datakey)
|
|||
{
|
||||
cp
|
||||
return send_request(to->nexthop, "%d %s %s %s", ANS_KEY,
|
||||
from->name, to->name, datakey);
|
||||
from->name, to->name, datakey);
|
||||
}
|
||||
|
||||
int ans_key_h(conn_list_t *cl)
|
||||
|
|
@ -816,14 +914,14 @@ cp
|
|||
if(sscanf(cl->buffer, "%*d %as %as %as", &from_id, &to_id, &datakey) != 3)
|
||||
{
|
||||
syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"),
|
||||
cl->name, cl->hostname);
|
||||
cl->name, cl->hostname);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
if(!(from = lookup_id(from_id)))
|
||||
{
|
||||
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);
|
||||
cl->name, cl->hostname, from_id);
|
||||
free(from_id); free(to_id); free(datakey);
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -833,13 +931,13 @@ cp
|
|||
if(!strcmp(to_id, myself->name))
|
||||
{
|
||||
/* It is for us, convert it to binary and set the key with it. */
|
||||
|
||||
|
||||
keylength = strlen(datakey);
|
||||
|
||||
|
||||
if((keylength%2) || (keylength <= 0))
|
||||
{
|
||||
syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key"),
|
||||
cl->name, cl->hostname, from->name);
|
||||
cl->name, cl->hostname, from->name);
|
||||
free(from_id); free(to_id); free(datakey);
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -852,7 +950,7 @@ cp
|
|||
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);
|
||||
cl->name, cl->hostname, to_id);
|
||||
free(from_id); free(to_id); free(datakey);
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -873,7 +971,7 @@ cp
|
|||
*/
|
||||
|
||||
int notify_others(conn_list_t *new, conn_list_t *source,
|
||||
int (*function)(conn_list_t*, conn_list_t*))
|
||||
int (*function)(conn_list_t*, conn_list_t*))
|
||||
{
|
||||
conn_list_t *p;
|
||||
cp
|
||||
|
|
|
|||
Loading…
Reference in a new issue