2 * Copyright 2018-2022 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #if defined(OPENSSL_SYS_LINUX)
11 # ifndef OPENSSL_NO_KTLS
12 # include <linux/version.h>
13 # if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
14 # define OPENSSL_NO_KTLS
16 # warning "KTLS requires Kernel Headers >= 4.13.0"
17 # warning "Skipping Compilation of KTLS"
23 #ifndef HEADER_INTERNAL_KTLS
24 # define HEADER_INTERNAL_KTLS
27 # ifndef OPENSSL_NO_KTLS
29 # if defined(__FreeBSD__)
30 # include <sys/types.h>
31 # include <sys/socket.h>
32 # include <sys/ktls.h>
33 # include <netinet/in.h>
34 # include <netinet/tcp.h>
35 # include <openssl/ssl3.h>
37 # ifndef TCP_RXTLS_ENABLE
38 # define OPENSSL_NO_KTLS_RX
40 # define OPENSSL_KTLS_AES_GCM_128
41 # define OPENSSL_KTLS_AES_GCM_256
42 # define OPENSSL_KTLS_TLS13
43 # ifdef TLS_CHACHA20_IV_LEN
44 # ifndef OPENSSL_NO_CHACHA
45 # define OPENSSL_KTLS_CHACHA20_POLY1305
49 typedef struct tls_enable ktls_crypto_info_t;
52 * FreeBSD does not require any additional steps to enable KTLS before
55 static ossl_inline int ktls_enable(int fd)
61 * The TCP_TXTLS_ENABLE socket option marks the outgoing socket buffer
62 * as using TLS. If successful, then data sent using this socket will
63 * be encrypted and encapsulated in TLS records using the tls_en
66 * The TCP_RXTLS_ENABLE socket option marks the incoming socket buffer
67 * as using TLS. If successful, then data received for this socket will
68 * be authenticated and decrypted using the tls_en provided here.
70 static ossl_inline int ktls_start(int fd, ktls_crypto_info_t *tls_en, int is_tx)
73 return setsockopt(fd, IPPROTO_TCP, TCP_TXTLS_ENABLE,
74 tls_en, sizeof(*tls_en)) ? 0 : 1;
75 # ifndef OPENSSL_NO_KTLS_RX
76 return setsockopt(fd, IPPROTO_TCP, TCP_RXTLS_ENABLE, tls_en,
77 sizeof(*tls_en)) ? 0 : 1;
83 /* Not supported on FreeBSD */
84 static ossl_inline int ktls_enable_tx_zerocopy_sendfile(int fd)
90 * Send a TLS record using the tls_en provided in ktls_start and use
91 * record_type instead of the default SSL3_RT_APPLICATION_DATA.
92 * When the socket is non-blocking, then this call either returns EAGAIN or
93 * the entire record is pushed to TCP. It is impossible to send a partial
94 * record using this control message.
96 static ossl_inline int ktls_send_ctrl_message(int fd, unsigned char record_type,
97 const void *data, size_t length)
99 struct msghdr msg = { 0 };
100 int cmsg_len = sizeof(record_type);
101 struct cmsghdr *cmsg;
102 char buf[CMSG_SPACE(cmsg_len)];
103 struct iovec msg_iov; /* Vector of data to send/receive into */
105 msg.msg_control = buf;
106 msg.msg_controllen = sizeof(buf);
107 cmsg = CMSG_FIRSTHDR(&msg);
108 cmsg->cmsg_level = IPPROTO_TCP;
109 cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
110 cmsg->cmsg_len = CMSG_LEN(cmsg_len);
111 *((unsigned char *)CMSG_DATA(cmsg)) = record_type;
112 msg.msg_controllen = cmsg->cmsg_len;
114 msg_iov.iov_base = (void *)data;
115 msg_iov.iov_len = length;
116 msg.msg_iov = &msg_iov;
119 return sendmsg(fd, &msg, 0);
122 # ifdef OPENSSL_NO_KTLS_RX
124 static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
129 # else /* !defined(OPENSSL_NO_KTLS_RX) */
132 * Receive a TLS record using the tls_en provided in ktls_start. The
133 * kernel strips any explicit IV and authentication tag, but provides
134 * the TLS record header via a control message. If there is an error
135 * with the TLS record such as an invalid header, invalid padding, or
136 * authentication failure recvmsg() will fail with an error.
138 static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
140 struct msghdr msg = { 0 };
141 int cmsg_len = sizeof(struct tls_get_record);
142 struct tls_get_record *tgr;
143 struct cmsghdr *cmsg;
144 char buf[CMSG_SPACE(cmsg_len)];
145 struct iovec msg_iov; /* Vector of data to send/receive into */
147 unsigned char *p = data;
148 const size_t prepend_length = SSL3_RT_HEADER_LENGTH;
150 if (length <= prepend_length) {
155 msg.msg_control = buf;
156 msg.msg_controllen = sizeof(buf);
158 msg_iov.iov_base = p + prepend_length;
159 msg_iov.iov_len = length - prepend_length;
160 msg.msg_iov = &msg_iov;
163 ret = recvmsg(fd, &msg, 0);
167 if ((msg.msg_flags & (MSG_EOR | MSG_CTRUNC)) != MSG_EOR) {
172 if (msg.msg_controllen == 0) {
177 cmsg = CMSG_FIRSTHDR(&msg);
178 if (cmsg->cmsg_level != IPPROTO_TCP || cmsg->cmsg_type != TLS_GET_RECORD
179 || cmsg->cmsg_len != CMSG_LEN(cmsg_len)) {
184 tgr = (struct tls_get_record *)CMSG_DATA(cmsg);
185 p[0] = tgr->tls_type;
186 p[1] = tgr->tls_vmajor;
187 p[2] = tgr->tls_vminor;
188 *(uint16_t *)(p + 3) = htons(ret);
190 return ret + prepend_length;
193 # endif /* OPENSSL_NO_KTLS_RX */
196 * KTLS enables the sendfile system call to send data from a file over
199 static ossl_inline ossl_ssize_t ktls_sendfile(int s, int fd, off_t off,
200 size_t size, int flags)
205 ret = sendfile(fd, s, off, size, NULL, &sbytes, flags);
206 if (ret == -1 && sbytes == 0)
211 # endif /* __FreeBSD__ */
213 # if defined(OPENSSL_SYS_LINUX)
215 # include <linux/tls.h>
216 # if LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0)
217 # define OPENSSL_NO_KTLS_RX
219 # warning "KTLS requires Kernel Headers >= 4.17.0 for receiving"
220 # warning "Skipping Compilation of KTLS receive data path"
223 # if LINUX_VERSION_CODE < KERNEL_VERSION(5, 19, 0)
224 # define OPENSSL_NO_KTLS_ZC_TX
226 # warning "KTLS requires Kernel Headers >= 5.19.0 for zerocopy sendfile"
227 # warning "Skipping Compilation of KTLS zerocopy sendfile"
230 # define OPENSSL_KTLS_AES_GCM_128
231 # if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 1, 0)
232 # define OPENSSL_KTLS_AES_GCM_256
233 # define OPENSSL_KTLS_TLS13
234 # if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
235 # define OPENSSL_KTLS_AES_CCM_128
236 # if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 11, 0)
237 # ifndef OPENSSL_NO_CHACHA
238 # define OPENSSL_KTLS_CHACHA20_POLY1305
244 # include <sys/sendfile.h>
245 # include <netinet/tcp.h>
246 # include <linux/socket.h>
247 # include <openssl/ssl3.h>
248 # include <openssl/tls1.h>
249 # include <openssl/evp.h>
263 struct tls_crypto_info_all {
265 # ifdef OPENSSL_KTLS_AES_GCM_128
266 struct tls12_crypto_info_aes_gcm_128 gcm128;
268 # ifdef OPENSSL_KTLS_AES_GCM_256
269 struct tls12_crypto_info_aes_gcm_256 gcm256;
271 # ifdef OPENSSL_KTLS_AES_CCM_128
272 struct tls12_crypto_info_aes_ccm_128 ccm128;
274 # ifdef OPENSSL_KTLS_CHACHA20_POLY1305
275 struct tls12_crypto_info_chacha20_poly1305 chacha20poly1305;
278 size_t tls_crypto_info_len;
281 typedef struct tls_crypto_info_all ktls_crypto_info_t;
284 * When successful, this socket option doesn't change the behaviour of the
285 * TCP socket, except changing the TCP setsockopt handler to enable the
286 * processing of SOL_TLS socket options. All other functionality remains the
289 static ossl_inline int ktls_enable(int fd)
291 return setsockopt(fd, SOL_TCP, TCP_ULP, "tls", sizeof("tls")) ? 0 : 1;
295 * The TLS_TX socket option changes the send/sendmsg handlers of the TCP socket.
296 * If successful, then data sent using this socket will be encrypted and
297 * encapsulated in TLS records using the crypto_info provided here.
298 * The TLS_RX socket option changes the recv/recvmsg handlers of the TCP socket.
299 * If successful, then data received using this socket will be decrypted,
300 * authenticated and decapsulated using the crypto_info provided here.
302 static ossl_inline int ktls_start(int fd, ktls_crypto_info_t *crypto_info,
305 return setsockopt(fd, SOL_TLS, is_tx ? TLS_TX : TLS_RX,
306 crypto_info, crypto_info->tls_crypto_info_len) ? 0 : 1;
309 static ossl_inline int ktls_enable_tx_zerocopy_sendfile(int fd)
311 #ifndef OPENSSL_NO_KTLS_ZC_TX
314 return setsockopt(fd, SOL_TLS, TLS_TX_ZEROCOPY_RO,
315 &enable, sizeof(enable)) ? 0 : 1;
322 * Send a TLS record using the crypto_info provided in ktls_start and use
323 * record_type instead of the default SSL3_RT_APPLICATION_DATA.
324 * When the socket is non-blocking, then this call either returns EAGAIN or
325 * the entire record is pushed to TCP. It is impossible to send a partial
326 * record using this control message.
328 static ossl_inline int ktls_send_ctrl_message(int fd, unsigned char record_type,
329 const void *data, size_t length)
332 int cmsg_len = sizeof(record_type);
333 struct cmsghdr *cmsg;
336 char buf[CMSG_SPACE(sizeof(unsigned char))];
338 struct iovec msg_iov; /* Vector of data to send/receive into */
340 memset(&msg, 0, sizeof(msg));
341 msg.msg_control = cmsgbuf.buf;
342 msg.msg_controllen = sizeof(cmsgbuf.buf);
343 cmsg = CMSG_FIRSTHDR(&msg);
344 cmsg->cmsg_level = SOL_TLS;
345 cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
346 cmsg->cmsg_len = CMSG_LEN(cmsg_len);
347 *((unsigned char *)CMSG_DATA(cmsg)) = record_type;
348 msg.msg_controllen = cmsg->cmsg_len;
350 msg_iov.iov_base = (void *)data;
351 msg_iov.iov_len = length;
352 msg.msg_iov = &msg_iov;
355 return sendmsg(fd, &msg, 0);
359 * KTLS enables the sendfile system call to send data from a file over TLS.
360 * @flags are ignored on Linux. (placeholder for FreeBSD sendfile)
362 static ossl_inline ossl_ssize_t ktls_sendfile(int s, int fd, off_t off, size_t size, int flags)
364 return sendfile(s, fd, &off, size);
367 # ifdef OPENSSL_NO_KTLS_RX
370 static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
375 # else /* !defined(OPENSSL_NO_KTLS_RX) */
378 * Receive a TLS record using the crypto_info provided in ktls_start.
379 * The kernel strips the TLS record header, IV and authentication tag,
380 * returning only the plaintext data or an error on failure.
381 * We add the TLS record header here to satisfy routines in rec_layer_s3.c
383 static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
386 struct cmsghdr *cmsg;
389 char buf[CMSG_SPACE(sizeof(unsigned char))];
391 struct iovec msg_iov;
393 unsigned char *p = data;
394 const size_t prepend_length = SSL3_RT_HEADER_LENGTH;
396 if (length < prepend_length + EVP_GCM_TLS_TAG_LEN) {
401 memset(&msg, 0, sizeof(msg));
402 msg.msg_control = cmsgbuf.buf;
403 msg.msg_controllen = sizeof(cmsgbuf.buf);
405 msg_iov.iov_base = p + prepend_length;
406 msg_iov.iov_len = length - prepend_length - EVP_GCM_TLS_TAG_LEN;
407 msg.msg_iov = &msg_iov;
410 ret = recvmsg(fd, &msg, 0);
414 if (msg.msg_controllen > 0) {
415 cmsg = CMSG_FIRSTHDR(&msg);
416 if (cmsg->cmsg_type == TLS_GET_RECORD_TYPE) {
417 p[0] = *((unsigned char *)CMSG_DATA(cmsg));
418 p[1] = TLS1_2_VERSION_MAJOR;
419 p[2] = TLS1_2_VERSION_MINOR;
420 /* returned length is limited to msg_iov.iov_len above */
421 p[3] = (ret >> 8) & 0xff;
423 ret += prepend_length;
430 # endif /* OPENSSL_NO_KTLS_RX */
432 # endif /* OPENSSL_SYS_LINUX */
433 # endif /* OPENSSL_NO_KTLS */
434 #endif /* HEADER_INTERNAL_KTLS */