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/*
* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/evp.h>
#include "../../ssl_local.h"
#include "../record_local.h"
#include "recmethod_local.h"
static int tls_any_set_crypto_state(OSSL_RECORD_LAYER *rl, int level,
unsigned char *key, size_t keylen,
unsigned char *iv, size_t ivlen,
unsigned char *mackey, size_t mackeylen,
const EVP_CIPHER *ciph,
size_t taglen,
int mactype,
const EVP_MD *md,
COMP_METHOD *comp)
{
if (level != OSSL_RECORD_PROTECTION_LEVEL_NONE) {
ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
return OSSL_RECORD_RETURN_FATAL;
}
/* No crypto protection at the "NONE" level so nothing to be done */
return OSSL_RECORD_RETURN_SUCCESS;
}
static int tls_any_cipher(OSSL_RECORD_LAYER *rl, SSL3_RECORD *recs,
size_t n_recs, int sending, SSL_MAC_BUF *macs,
size_t macsize)
{
return 1;
}
static int tls_validate_record_header(OSSL_RECORD_LAYER *rl, SSL3_RECORD *rec)
{
if (rec->rec_version == SSL2_VERSION) {
/* SSLv2 format ClientHello */
if (!ossl_assert(rl->version == TLS_ANY_VERSION)) {
RLAYERfatal(rl, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
if (rec->length < MIN_SSL2_RECORD_LEN) {
RLAYERfatal(rl, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_TOO_SHORT);
return 0;
}
} else {
if (rl->version == TLS_ANY_VERSION) {
if ((rec->rec_version >> 8) != SSL3_VERSION_MAJOR) {
if (rl->is_first_record) {
unsigned char *p;
/*
* Go back to start of packet, look at the five bytes that
* we have.
*/
p = rl->packet;
if (HAS_PREFIX((char *)p, "GET ") ||
HAS_PREFIX((char *)p, "POST ") ||
HAS_PREFIX((char *)p, "HEAD ") ||
HAS_PREFIX((char *)p, "PUT ")) {
RLAYERfatal(rl, SSL_AD_NO_ALERT, SSL_R_HTTP_REQUEST);
return 0;
} else if (HAS_PREFIX((char *)p, "CONNE")) {
RLAYERfatal(rl, SSL_AD_NO_ALERT,
SSL_R_HTTPS_PROXY_REQUEST);
return 0;
}
/* Doesn't look like TLS - don't send an alert */
RLAYERfatal(rl, SSL_AD_NO_ALERT,
SSL_R_WRONG_VERSION_NUMBER);
return 0;
} else {
RLAYERfatal(rl, SSL_AD_PROTOCOL_VERSION,
SSL_R_WRONG_VERSION_NUMBER);
return 0;
}
}
} else if (rl->version == TLS1_3_VERSION) {
/*
* In this case we know we are going to negotiate TLSv1.3, but we've
* had an HRR, so we haven't actually done so yet. In TLSv1.3 we
* must ignore the legacy record version in plaintext records.
*/
} else if (rec->rec_version != rl->version) {
if ((rl->version & 0xFF00) == (rec->rec_version & 0xFF00)) {
if (rec->type == SSL3_RT_ALERT) {
/*
* The record is using an incorrect version number,
* but what we've got appears to be an alert. We
* haven't read the body yet to check whether its a
* fatal or not - but chances are it is. We probably
* shouldn't send a fatal alert back. We'll just
* end.
*/
RLAYERfatal(rl, SSL_AD_NO_ALERT,
SSL_R_WRONG_VERSION_NUMBER);
return 0;
}
/* Send back error using their minor version number */
rl->version = (unsigned short)rec->rec_version;
}
RLAYERfatal(rl, SSL_AD_PROTOCOL_VERSION,
SSL_R_WRONG_VERSION_NUMBER);
return 0;
}
}
if (rec->length > SSL3_RT_MAX_PLAIN_LENGTH) {
/*
* We use SSL_R_DATA_LENGTH_TOO_LONG instead of
* SSL_R_ENCRYPTED_LENGTH_TOO_LONG here because we are the "any" method
* and we know that we are dealing with plaintext data
*/
RLAYERfatal(rl, SSL_AD_RECORD_OVERFLOW, SSL_R_DATA_LENGTH_TOO_LONG);
return 0;
}
return 1;
}
static int tls_any_set_protocol_version(OSSL_RECORD_LAYER *rl, int vers)
{
if (rl->version != TLS_ANY_VERSION && rl->version != vers)
return 0;
rl->version = vers;
return 1;
}
struct record_functions_st tls_any_funcs = {
tls_any_set_crypto_state,
tls_any_cipher,
NULL,
tls_any_set_protocol_version,
tls_default_read_n,
tls_get_more_records,
tls_validate_record_header,
tls_default_post_process_record,
tls_get_max_records_default,
tls_write_records_default,
tls_allocate_write_buffers_default,
tls_initialise_write_packets_default,
NULL,
tls_prepare_record_header_default,
NULL
};
static int dtls_any_set_protocol_version(OSSL_RECORD_LAYER *rl, int vers)
{
if (rl->version != DTLS_ANY_VERSION && rl->version != vers)
return 0;
rl->version = vers;
return 1;
}
struct record_functions_st dtls_any_funcs = {
tls_any_set_crypto_state,
tls_any_cipher,
NULL,
dtls_any_set_protocol_version,
tls_default_read_n,
dtls_get_more_records,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};
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