forked from cory/tildefriends
Cory McWilliams
d02751ee08
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4643 ed5197a5-7fde-0310-b194-c3ffbd925b24
429 lines
12 KiB
C
429 lines
12 KiB
C
/*
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* Copyright 2018-2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#if defined(OPENSSL_SYS_LINUX)
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# ifndef OPENSSL_NO_KTLS
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# include <linux/version.h>
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# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
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# define OPENSSL_NO_KTLS
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# ifndef PEDANTIC
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# warning "KTLS requires Kernel Headers >= 4.13.0"
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# warning "Skipping Compilation of KTLS"
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# endif
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# endif
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# endif
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#endif
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#ifndef HEADER_INTERNAL_KTLS
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# define HEADER_INTERNAL_KTLS
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# pragma once
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# ifndef OPENSSL_NO_KTLS
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# if defined(__FreeBSD__)
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# include <sys/types.h>
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# include <sys/socket.h>
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# include <sys/ktls.h>
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# include <netinet/in.h>
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# include <netinet/tcp.h>
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# include <openssl/ssl3.h>
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# ifndef TCP_RXTLS_ENABLE
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# define OPENSSL_NO_KTLS_RX
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# endif
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# define OPENSSL_KTLS_AES_GCM_128
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# define OPENSSL_KTLS_AES_GCM_256
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# define OPENSSL_KTLS_TLS13
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# ifdef TLS_CHACHA20_IV_LEN
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# ifndef OPENSSL_NO_CHACHA
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# define OPENSSL_KTLS_CHACHA20_POLY1305
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# endif
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# endif
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typedef struct tls_enable ktls_crypto_info_t;
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/*
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* FreeBSD does not require any additional steps to enable KTLS before
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* setting keys.
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*/
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static ossl_inline int ktls_enable(int fd)
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{
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return 1;
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}
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/*
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* The TCP_TXTLS_ENABLE socket option marks the outgoing socket buffer
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* as using TLS. If successful, then data sent using this socket will
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* be encrypted and encapsulated in TLS records using the tls_en
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* provided here.
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*
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* The TCP_RXTLS_ENABLE socket option marks the incoming socket buffer
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* as using TLS. If successful, then data received for this socket will
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* be authenticated and decrypted using the tls_en provided here.
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*/
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static ossl_inline int ktls_start(int fd, ktls_crypto_info_t *tls_en, int is_tx)
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{
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if (is_tx)
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return setsockopt(fd, IPPROTO_TCP, TCP_TXTLS_ENABLE,
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tls_en, sizeof(*tls_en)) ? 0 : 1;
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# ifndef OPENSSL_NO_KTLS_RX
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return setsockopt(fd, IPPROTO_TCP, TCP_RXTLS_ENABLE, tls_en,
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sizeof(*tls_en)) ? 0 : 1;
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# else
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return 0;
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# endif
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}
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/*
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* Send a TLS record using the tls_en provided in ktls_start and use
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* record_type instead of the default SSL3_RT_APPLICATION_DATA.
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* When the socket is non-blocking, then this call either returns EAGAIN or
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* the entire record is pushed to TCP. It is impossible to send a partial
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* record using this control message.
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*/
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static ossl_inline int ktls_send_ctrl_message(int fd, unsigned char record_type,
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const void *data, size_t length)
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{
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struct msghdr msg = { 0 };
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int cmsg_len = sizeof(record_type);
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struct cmsghdr *cmsg;
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char buf[CMSG_SPACE(cmsg_len)];
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struct iovec msg_iov; /* Vector of data to send/receive into */
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msg.msg_control = buf;
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msg.msg_controllen = sizeof(buf);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = IPPROTO_TCP;
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cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
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cmsg->cmsg_len = CMSG_LEN(cmsg_len);
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*((unsigned char *)CMSG_DATA(cmsg)) = record_type;
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msg.msg_controllen = cmsg->cmsg_len;
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msg_iov.iov_base = (void *)data;
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msg_iov.iov_len = length;
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msg.msg_iov = &msg_iov;
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msg.msg_iovlen = 1;
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return sendmsg(fd, &msg, 0);
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}
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# ifdef OPENSSL_NO_KTLS_RX
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static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
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{
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return -1;
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}
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# else /* !defined(OPENSSL_NO_KTLS_RX) */
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/*
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* Receive a TLS record using the tls_en provided in ktls_start. The
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* kernel strips any explicit IV and authentication tag, but provides
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* the TLS record header via a control message. If there is an error
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* with the TLS record such as an invalid header, invalid padding, or
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* authentication failure recvmsg() will fail with an error.
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*/
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static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
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{
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struct msghdr msg = { 0 };
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int cmsg_len = sizeof(struct tls_get_record);
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struct tls_get_record *tgr;
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struct cmsghdr *cmsg;
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char buf[CMSG_SPACE(cmsg_len)];
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struct iovec msg_iov; /* Vector of data to send/receive into */
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int ret;
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unsigned char *p = data;
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const size_t prepend_length = SSL3_RT_HEADER_LENGTH;
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if (length <= prepend_length) {
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errno = EINVAL;
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return -1;
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}
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msg.msg_control = buf;
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msg.msg_controllen = sizeof(buf);
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msg_iov.iov_base = p + prepend_length;
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msg_iov.iov_len = length - prepend_length;
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msg.msg_iov = &msg_iov;
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msg.msg_iovlen = 1;
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ret = recvmsg(fd, &msg, 0);
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if (ret <= 0)
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return ret;
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if ((msg.msg_flags & (MSG_EOR | MSG_CTRUNC)) != MSG_EOR) {
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errno = EMSGSIZE;
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return -1;
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}
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if (msg.msg_controllen == 0) {
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errno = EBADMSG;
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return -1;
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}
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cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg->cmsg_level != IPPROTO_TCP || cmsg->cmsg_type != TLS_GET_RECORD
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|| cmsg->cmsg_len != CMSG_LEN(cmsg_len)) {
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errno = EBADMSG;
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return -1;
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}
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tgr = (struct tls_get_record *)CMSG_DATA(cmsg);
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p[0] = tgr->tls_type;
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p[1] = tgr->tls_vmajor;
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p[2] = tgr->tls_vminor;
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*(uint16_t *)(p + 3) = htons(ret);
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return ret + prepend_length;
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}
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# endif /* OPENSSL_NO_KTLS_RX */
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/*
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* KTLS enables the sendfile system call to send data from a file over
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* TLS.
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*/
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static ossl_inline ossl_ssize_t ktls_sendfile(int s, int fd, off_t off,
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size_t size, int flags)
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{
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off_t sbytes = 0;
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int ret;
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ret = sendfile(fd, s, off, size, NULL, &sbytes, flags);
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if (ret == -1 && sbytes == 0)
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return -1;
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return sbytes;
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}
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# endif /* __FreeBSD__ */
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# if defined(OPENSSL_SYS_LINUX)
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# include <linux/tls.h>
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# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0)
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# define OPENSSL_NO_KTLS_RX
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# ifndef PEDANTIC
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# warning "KTLS requires Kernel Headers >= 4.17.0 for receiving"
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# warning "Skipping Compilation of KTLS receive data path"
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# endif
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# endif
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# if LINUX_VERSION_CODE < KERNEL_VERSION(5, 19, 0)
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# define OPENSSL_NO_KTLS_ZC_TX
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# ifndef PEDANTIC
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# warning "KTLS requires Kernel Headers >= 5.19.0 for zerocopy sendfile"
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# warning "Skipping Compilation of KTLS zerocopy sendfile"
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# endif
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# endif
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# define OPENSSL_KTLS_AES_GCM_128
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# if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 1, 0)
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# define OPENSSL_KTLS_AES_GCM_256
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# define OPENSSL_KTLS_TLS13
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# if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
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# define OPENSSL_KTLS_AES_CCM_128
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# if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 11, 0)
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# ifndef OPENSSL_NO_CHACHA
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# define OPENSSL_KTLS_CHACHA20_POLY1305
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# endif
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# endif
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# endif
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# endif
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# include <sys/sendfile.h>
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# include <netinet/tcp.h>
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# include <linux/socket.h>
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# include <openssl/ssl3.h>
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# include <openssl/tls1.h>
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# include <openssl/evp.h>
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# ifndef SOL_TLS
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# define SOL_TLS 282
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# endif
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# ifndef TCP_ULP
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# define TCP_ULP 31
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# endif
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# ifndef TLS_RX
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# define TLS_RX 2
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# endif
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struct tls_crypto_info_all {
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union {
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# ifdef OPENSSL_KTLS_AES_GCM_128
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struct tls12_crypto_info_aes_gcm_128 gcm128;
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# endif
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# ifdef OPENSSL_KTLS_AES_GCM_256
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struct tls12_crypto_info_aes_gcm_256 gcm256;
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# endif
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# ifdef OPENSSL_KTLS_AES_CCM_128
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struct tls12_crypto_info_aes_ccm_128 ccm128;
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# endif
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# ifdef OPENSSL_KTLS_CHACHA20_POLY1305
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struct tls12_crypto_info_chacha20_poly1305 chacha20poly1305;
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# endif
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};
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size_t tls_crypto_info_len;
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};
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typedef struct tls_crypto_info_all ktls_crypto_info_t;
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/*
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* When successful, this socket option doesn't change the behaviour of the
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* TCP socket, except changing the TCP setsockopt handler to enable the
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* processing of SOL_TLS socket options. All other functionality remains the
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* same.
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*/
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static ossl_inline int ktls_enable(int fd)
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{
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return setsockopt(fd, SOL_TCP, TCP_ULP, "tls", sizeof("tls")) ? 0 : 1;
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}
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/*
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* The TLS_TX socket option changes the send/sendmsg handlers of the TCP socket.
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* If successful, then data sent using this socket will be encrypted and
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* encapsulated in TLS records using the crypto_info provided here.
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* The TLS_RX socket option changes the recv/recvmsg handlers of the TCP socket.
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* If successful, then data received using this socket will be decrypted,
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* authenticated and decapsulated using the crypto_info provided here.
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*/
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static ossl_inline int ktls_start(int fd, ktls_crypto_info_t *crypto_info,
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int is_tx)
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{
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return setsockopt(fd, SOL_TLS, is_tx ? TLS_TX : TLS_RX,
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crypto_info, crypto_info->tls_crypto_info_len) ? 0 : 1;
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}
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static ossl_inline int ktls_enable_tx_zerocopy_sendfile(int fd)
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{
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#ifndef OPENSSL_NO_KTLS_ZC_TX
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int enable = 1;
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return setsockopt(fd, SOL_TLS, TLS_TX_ZEROCOPY_RO,
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&enable, sizeof(enable)) ? 0 : 1;
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#else
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return 0;
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#endif
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}
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/*
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* Send a TLS record using the crypto_info provided in ktls_start and use
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* record_type instead of the default SSL3_RT_APPLICATION_DATA.
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* When the socket is non-blocking, then this call either returns EAGAIN or
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* the entire record is pushed to TCP. It is impossible to send a partial
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* record using this control message.
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*/
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static ossl_inline int ktls_send_ctrl_message(int fd, unsigned char record_type,
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const void *data, size_t length)
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{
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struct msghdr msg;
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int cmsg_len = sizeof(record_type);
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struct cmsghdr *cmsg;
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union {
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struct cmsghdr hdr;
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char buf[CMSG_SPACE(sizeof(unsigned char))];
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} cmsgbuf;
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struct iovec msg_iov; /* Vector of data to send/receive into */
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memset(&msg, 0, sizeof(msg));
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msg.msg_control = cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_TLS;
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cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
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cmsg->cmsg_len = CMSG_LEN(cmsg_len);
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*((unsigned char *)CMSG_DATA(cmsg)) = record_type;
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msg.msg_controllen = cmsg->cmsg_len;
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msg_iov.iov_base = (void *)data;
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msg_iov.iov_len = length;
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msg.msg_iov = &msg_iov;
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msg.msg_iovlen = 1;
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return sendmsg(fd, &msg, 0);
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}
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/*
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* KTLS enables the sendfile system call to send data from a file over TLS.
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* @flags are ignored on Linux. (placeholder for FreeBSD sendfile)
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* */
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static ossl_inline ossl_ssize_t ktls_sendfile(int s, int fd, off_t off, size_t size, int flags)
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{
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return sendfile(s, fd, &off, size);
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}
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# ifdef OPENSSL_NO_KTLS_RX
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static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
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{
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return -1;
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}
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# else /* !defined(OPENSSL_NO_KTLS_RX) */
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/*
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* Receive a TLS record using the crypto_info provided in ktls_start.
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* The kernel strips the TLS record header, IV and authentication tag,
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* returning only the plaintext data or an error on failure.
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* We add the TLS record header here to satisfy routines in rec_layer_s3.c
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*/
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static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
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{
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struct msghdr msg;
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struct cmsghdr *cmsg;
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union {
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struct cmsghdr hdr;
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char buf[CMSG_SPACE(sizeof(unsigned char))];
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} cmsgbuf;
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struct iovec msg_iov;
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int ret;
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unsigned char *p = data;
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const size_t prepend_length = SSL3_RT_HEADER_LENGTH;
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if (length < prepend_length + EVP_GCM_TLS_TAG_LEN) {
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errno = EINVAL;
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return -1;
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}
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memset(&msg, 0, sizeof(msg));
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msg.msg_control = cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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msg_iov.iov_base = p + prepend_length;
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msg_iov.iov_len = length - prepend_length - EVP_GCM_TLS_TAG_LEN;
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msg.msg_iov = &msg_iov;
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msg.msg_iovlen = 1;
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ret = recvmsg(fd, &msg, 0);
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if (ret < 0)
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return ret;
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if (msg.msg_controllen > 0) {
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cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg->cmsg_type == TLS_GET_RECORD_TYPE) {
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p[0] = *((unsigned char *)CMSG_DATA(cmsg));
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p[1] = TLS1_2_VERSION_MAJOR;
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p[2] = TLS1_2_VERSION_MINOR;
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/* returned length is limited to msg_iov.iov_len above */
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p[3] = (ret >> 8) & 0xff;
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p[4] = ret & 0xff;
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ret += prepend_length;
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}
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}
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return ret;
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}
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# endif /* OPENSSL_NO_KTLS_RX */
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# endif /* OPENSSL_SYS_LINUX */
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# endif /* OPENSSL_NO_KTLS */
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#endif /* HEADER_INTERNAL_KTLS */
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