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diff -Nur src/protocol_auth.c src/protocol_auth.c
--- src/protocol_auth.c Fri May 27 14:28:54 2005
+++ src/protocol_auth.c Fri May 27 14:28:30 2005
@@ -118,7 +118,7 @@
bool send_metakey(connection_t *c)
{
- char buffer[MAX_STRING_SIZE];
+ char *buffer;
int len;
bool x;
@@ -129,10 +129,11 @@
/* Allocate buffers for the meta key */
if(!c->outkey)
- c->outkey = xmalloc(len);
+ c->outkey = xmalloc_and_zero(len);
if(!c->outctx)
c->outctx = xmalloc_and_zero(sizeof(*c->outctx));
+ buffer = xmalloc_and_zero(2 * len + 1);
cp();
/* Copy random data to the buffer */
@@ -167,6 +168,7 @@
if(RSA_public_encrypt(len, c->outkey, buffer, c->rsa_key, RSA_NO_PADDING) != len) {
logger(LOG_ERR, _("Error during encryption of meta key for %s (%s)"),
c->name, c->hostname);
+ free(buffer);
return false;
}
@@ -191,35 +193,45 @@
c->outcipher->iv_len)) {
logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+ free(buffer);
return false;
}
c->status.encryptout = true;
}
+ free(buffer);
return x;
}
bool metakey_h(connection_t *c)
{
- char buffer[MAX_STRING_SIZE];
+ char *buffer, fmt[513];
int cipher, digest, maclength, compression;
int len;
cp();
- if(sscanf(c->buffer, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, buffer) != 5) {
+ len = RSA_size(myself->connection->rsa_key);
+ buffer = xmalloc(2 * len + 1);
+ memset(buffer, 0, 2 * len + 1);
+
+ memset(fmt, 0, 513);
+ snprintf(fmt, 512, "%%*d %%d %%d %%d %%d %%%ds", 2 * len);
+
+ if(sscanf(c->buffer, fmt, &cipher, &digest, &maclength, &compression, buffer) != 5) {
logger(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name,
c->hostname);
+ free(buffer);
return false;
}
- len = RSA_size(myself->connection->rsa_key);
/* Check if the length of the meta key is all right */
if(strlen(buffer) != len * 2) {
logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength");
+ free(buffer);
return false;
}
@@ -240,6 +252,7 @@
if(RSA_private_decrypt(len, buffer, c->inkey, myself->connection->rsa_key, RSA_NO_PADDING) != len) { /* See challenge() */
logger(LOG_ERR, _("Error during encryption of meta key for %s (%s)"),
c->name, c->hostname);
+ free(buffer);
return false;
}
@@ -258,6 +271,7 @@
if(!c->incipher) {
logger(LOG_ERR, _("%s (%s) uses unknown cipher!"), c->name, c->hostname);
+ free(buffer);
return false;
}
@@ -267,6 +281,7 @@
c->incipher->iv_len)) {
logger(LOG_ERR, _("Error during initialisation of cipher from %s (%s): %s"),
c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+ free(buffer);
return false;
}
@@ -282,11 +297,13 @@
if(!c->indigest) {
logger(LOG_ERR, _("Node %s (%s) uses unknown digest!"), c->name, c->hostname);
+ free(buffer);
return false;
}
if(c->inmaclength > c->indigest->md_size || c->inmaclength < 0) {
logger(LOG_ERR, _("%s (%s) uses bogus MAC length!"), c->name, c->hostname);
+ free(buffer);
return false;
}
} else {
@@ -297,19 +314,22 @@
c->allow_request = CHALLENGE;
+ free(buffer);
return send_challenge(c);
}
bool send_challenge(connection_t *c)
{
- char buffer[MAX_STRING_SIZE];
+ char *buffer;
int len;
+ bool ret;
cp();
/* CHECKME: what is most reasonable value for len? */
len = RSA_size(c->rsa_key);
+ buffer = xmalloc_and_zero(2 * len + 1);
/* Allocate buffers for the challenge */
@@ -327,29 +347,37 @@
/* Send the challenge */
- return send_request(c, "%d %s", CHALLENGE, buffer);
+ ret = send_request(c, "%d %s", CHALLENGE, buffer);
+
+ free(buffer);
+
+ return ret;
}
bool challenge_h(connection_t *c)
{
- char buffer[MAX_STRING_SIZE];
- int len;
+ char *buffer, fmt[513];
+ int len = RSA_size(myself->connection->rsa_key);
cp();
- if(sscanf(c->buffer, "%*d " MAX_STRING, buffer) != 1) {
+ buffer = xmalloc(2 * len + 1);
+ memset(fmt, 0, 513);
+ snprintf(fmt, 512, "%%*d %%%ds", 2*len);
+
+ if(sscanf(c->buffer, fmt, buffer) != 1) {
logger(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name,
c->hostname);
+ free(buffer);
return false;
}
- len = RSA_size(myself->connection->rsa_key);
-
/* Check if the length of the challenge is all right */
if(strlen(buffer) != len * 2) {
logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
c->hostname, "wrong challenge length");
+ free(buffer);
return false;
}
@@ -366,6 +394,7 @@
/* Rest is done by send_chal_reply() */
+ free(buffer);
return send_chal_reply(c);
}
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