mirror of
https://github.com/freebsd/freebsd-src
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107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2018-2024 Netflix
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* Author: Maksim Yevmenkin <maksim.yevmenkin@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#define ACCEPT_FILTER_MOD
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <sys/socketvar.h>
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static int sbfull(struct sockbuf *sb);
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static uint8_t sbmget8(struct mbuf *m, int offset);
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static int so_hastls(struct socket *so, void *arg, int waitflag);
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ACCEPT_FILTER_DEFINE(accf_tls, "tlsready", so_hastls, NULL, NULL, 1);
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static int
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sbfull(struct sockbuf *sb)
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{
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return (sbused(sb) >= sb->sb_hiwat || sb->sb_mbcnt >= sb->sb_mbmax);
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}
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static uint8_t
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sbmget8(struct mbuf *m, int offset)
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{
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struct mbuf *n = m->m_nextpkt;
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while (m != NULL && offset >= m->m_len) {
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offset -= m->m_len;
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m = m->m_next;
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if (m == NULL) {
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m = n;
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n = m->m_nextpkt;
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}
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}
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return *(mtod(m, uint8_t *) + offset);
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}
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static int
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so_hastls(struct socket *so, void *arg, int waitflag)
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{
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struct sockbuf *sb = &so->so_rcv;
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int avail;
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uint16_t reclen;
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if ((sb->sb_state & SBS_CANTRCVMORE) || sbfull(sb))
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return (SU_ISCONNECTED); /* can't wait any longer */
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/*
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* struct {
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* ContentType type; - 1 byte, 0x16 handshake
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* ProtocolVersion version; - 2 bytes (major, minor)
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* uint16 length; - 2 bytes, NBO, 2^14 max
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* opaque fragment[TLSPlaintext.length];
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* } TLSPlaintext;
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*/
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/* Did we get at least 5 bytes */
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avail = sbavail(sb);
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if (avail < 5)
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return (SU_OK); /* nope */
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/* Does this look like TLS handshake? */
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if (sbmget8(sb->sb_mb, 0) != 0x16)
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return (SU_ISCONNECTED); /* nope */
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/* Did we get a complete TLS record? */
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reclen = (uint16_t) sbmget8(sb->sb_mb, 3) << 8;
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reclen |= (uint16_t) sbmget8(sb->sb_mb, 4);
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if (reclen <= 16384 && avail < (int) 5 + reclen)
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return (SU_OK); /* nope */
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return (SU_ISCONNECTED);
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}
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