int TMsg::setAuthInfoKey() {
#ifndef MOD_DISABLE_AUTH
// key = HMAC-SHA1 (AAA-key, {Key Generation Nonce || client identifier})
char *KeyGenNonce_ClientID;
char * AAAkey;
uint32_t AAAkeyLen;
if (!KeyGenNonce)
KeyGenNonceLen = 16;
/// @todo set proper size of Client ID (DUID?) (here and in hmac_sha())
KeyGenNonce_ClientID = new char[KeyGenNonceLen+128];
AAAkey = getAAAKey(AAASPI, &AAAkeyLen);
std::string fname = getAAAKeyFilename(AAASPI);
// error, no file?
if (!AAAkey) {
Log(Error) << "Auth: Unable to load key file for SPI " << std::hex << AAASPI <<": " << fname
<< " not found." << std::dec << LogEnd;
AuthInfoKey = NULL;
delete [] KeyGenNonce_ClientID;
return -1;
}
Log(Debug) << "Auth: AAA-key loaded from file " << fname << "." << LogEnd;
PrintHex("Auth: AAA-key: ", AAAkey, AAAkeyLen);
memset(KeyGenNonce_ClientID, 0, KeyGenNonceLen+128);
if (KeyGenNonce)
memcpy(KeyGenNonce_ClientID, KeyGenNonce, KeyGenNonceLen);
/// @todo fill also with ClientID (DUID?)
PrintHex("Auth: Infokey: using KeyGenNonce+CliendID: ", KeyGenNonce_ClientID, KeyGenNonceLen+128);
Log(Debug) << "Auth: AAAKeyLen: " << AAAkeyLen << ", KeyGenNonceLen: " << KeyGenNonceLen << LogEnd;
AuthInfoKey = new char[AUTHKEYLEN];
hmac_sha(KeyGenNonce_ClientID, KeyGenNonceLen+128, AAAkey, AAAkeyLen, (char *)AuthInfoKey, 1);
PrintHex("Auth: AuthInfoKey (calculated): ", AuthInfoKey, AUTHKEYLEN);
delete [] KeyGenNonce_ClientID;
#endif
return 0;
}
char * getAAAKey(uint32_t SPI, unsigned *len) {
char * filename = 0;
struct stat st;
char * retval;
int offset = 0;
int fd;
int ret;
filename = getAAAKeyFilename(SPI);
if (stat(filename, &st))
return NULL;
fd = open(filename, O_RDONLY);
if (0 > fd)
return NULL;
retval = malloc(st.st_size);
if (!retval) {
close(fd);
return NULL;
}
while (offset < st.st_size) {
ret = read(fd, retval + offset, st.st_size - offset);
if (!ret)
break;
if (ret < 0) {
free(retval);
close(fd);
return NULL;
}
offset += ret;
}
close(fd);
if (offset != st.st_size) {
free(retval);
return NULL;
}
*len = st.st_size;
return retval;
}