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/* $OpenBSD: ssl_packet.c,v 1.16 2024/06/28 13:37:49 jsing Exp $ */
/*
* Copyright (c) 2016, 2017 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "bytestring.h"
#include "ssl_local.h"
static int
ssl_is_sslv3_handshake(CBS *header)
{
uint16_t record_version;
uint8_t record_type;
CBS cbs;
CBS_dup(header, &cbs);
if (!CBS_get_u8(&cbs, &record_type) ||
!CBS_get_u16(&cbs, &record_version))
return 0;
if (record_type != SSL3_RT_HANDSHAKE)
return 0;
if ((record_version >> 8) != SSL3_VERSION_MAJOR)
return 0;
return 1;
}
/*
* Potentially do legacy processing on the first packet received by a TLS
* server. We return 1 if we want SSLv3/TLS record processing to continue
* normally, otherwise we must set an SSLerr and return -1.
*/
int
ssl_server_legacy_first_packet(SSL *s)
{
const char *data;
CBS header;
if (SSL_is_dtls(s))
return 1;
CBS_init(&header, s->packet, SSL3_RT_HEADER_LENGTH);
if (ssl_is_sslv3_handshake(&header) == 1)
return 1;
/* Only continue if this is not a version locked method. */
if (s->method->min_tls_version == s->method->max_tls_version)
return 1;
/* Ensure that we have SSL3_RT_HEADER_LENGTH (5 bytes) of the packet. */
if (CBS_len(&header) != SSL3_RT_HEADER_LENGTH) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
return -1;
}
data = (const char *)CBS_data(&header);
/* Is this a cleartext protocol? */
if (strncmp("GET ", data, 4) == 0 ||
strncmp("POST ", data, 5) == 0 ||
strncmp("HEAD ", data, 5) == 0 ||
strncmp("PUT ", data, 4) == 0) {
SSLerror(s, SSL_R_HTTP_REQUEST);
return -1;
}
if (strncmp("CONNE", data, 5) == 0) {
SSLerror(s, SSL_R_HTTPS_PROXY_REQUEST);
return -1;
}
SSLerror(s, SSL_R_UNKNOWN_PROTOCOL);
return -1;
}
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