void buffer_copy_string_hex(buffer *b, const char *in, size_t in_len) {
/* overflow protection */
force_assert(in_len * 2 > in_len);
buffer_string_set_length(b, 2 * in_len);
li_tohex(b->ptr, in, in_len);
}
static void CvtHex(const HASH Bin, char (*Hex)[33]) {
li_tohex(*Hex, sizeof(*Hex), (const char*) Bin, 16);
}
static int secdl_verify_mac(server *srv, plugin_config *config, const char* protected_path, const char* mac, size_t maclen) {
UNUSED(srv);
if (0 == maclen || secdl_algorithm_mac_length(config->algorithm) != maclen) return 0;
switch (config->algorithm) {
case SECDL_INVALID:
break;
case SECDL_MD5:
{
li_MD5_CTX Md5Ctx;
HASH HA1;
char hexmd5[33];
const char *ts_str;
const char *rel_uri;
/* legacy message:
* protected_path := '/' <timestamp-hex> <rel-path>
* timestamp-hex := [0-9a-f]{8}
* rel-path := '/' any*
* (the protected path was already verified)
* message = <secret><rel-path><timestamp-hex>
*/
ts_str = protected_path + 1;
rel_uri = ts_str + 8;
li_MD5_Init(&Md5Ctx);
li_MD5_Update(&Md5Ctx, CONST_BUF_LEN(config->secret));
li_MD5_Update(&Md5Ctx, rel_uri, strlen(rel_uri));
li_MD5_Update(&Md5Ctx, ts_str, 8);
li_MD5_Final(HA1, &Md5Ctx);
li_tohex(hexmd5, sizeof(hexmd5), (const char *)HA1, 16);
return (32 == maclen) && const_time_memeq(mac, hexmd5, 32);
}
case SECDL_HMAC_SHA1:
#ifdef USE_OPENSSL_CRYPTO
{
unsigned char digest[20];
char base64_digest[27];
if (NULL == HMAC(
EVP_sha1(),
(unsigned char const*) CONST_BUF_LEN(config->secret),
(unsigned char const*) protected_path, strlen(protected_path),
digest, NULL)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"hmac-sha1: HMAC() failed");
return 0;
}
li_to_base64_no_padding(base64_digest, 27, digest, 20, BASE64_URL);
return (27 == maclen) && const_time_memeq(mac, base64_digest, 27);
}
#endif
break;
case SECDL_HMAC_SHA256:
#ifdef USE_OPENSSL_CRYPTO
{
unsigned char digest[32];
char base64_digest[43];
if (NULL == HMAC(
EVP_sha256(),
(unsigned char const*) CONST_BUF_LEN(config->secret),
(unsigned char const*) protected_path, strlen(protected_path),
digest, NULL)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"hmac-sha256: HMAC() failed");
return 0;
}
li_to_base64_no_padding(base64_digest, 43, digest, 32, BASE64_URL);
return (43 == maclen) && const_time_memeq(mac, base64_digest, 43);
}
#endif
break;
}
return 0;
}
