wbrawner/openssl
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Linux ktls Rx infrastructure

Browse source 
Introduce the infrastructure for supproting receive side Linux Kernel TLS
data-path.

Change-Id: I71864d8f9d74a701cc8b0ad5536005f3c1716c1c
Signed-off-by: Boris Pismenny <borisp@mellanox.com>

Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7848)
This commit is contained in:
Boris Pismenny 2018-03-11 16:16:16 +02:00 committed by Matt Caswell
parent 31b6ed76df
commit f851a68932
1 changed files with 94 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

107
include/internal/ktls.h
View file

@ -21,10 +21,11 @@
# ifndef PEDANTIC
# warning "KTLS requires Kernel Headers >= 4.13.0"
# warning "Skipping Compilation of KTLS data path"
# warning "Skipping Compilation of KTLS"
# endif
# define TLS_TX 1
# define TLS_RX 2
# define TLS_CIPHER_AES_GCM_128 51
# define TLS_CIPHER_AES_GCM_128_IV_SIZE 8
@ -67,11 +68,19 @@ static ossl_inline int ktls_send_ctrl_message(int fd, unsigned char record_type,
return -1;
}
static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
{
return -1;
}
# else /* KERNEL_VERSION */
# include <netinet/tcp.h>
# include <linux/tls.h>
# include <linux/socket.h>
# include "openssl/ssl3.h"
# include "openssl/tls1.h"
# include "openssl/evp.h"
# ifndef SOL_TLS
# define SOL_TLS 282
@ -96,16 +105,16 @@ static ossl_inline int ktls_enable(int fd)
* The TLS_TX socket option changes the send/sendmsg handlers of the TCP socket.
* If successful, then data sent using this socket will be encrypted and
* encapsulated in TLS records using the crypto_info provided here.
* The TLS_RX socket option changes the recv/recvmsg handlers of the TCP socket.
* If successful, then data received using this socket will be decrypted,
* authenticated and decapsulated using the crypto_info provided here.
*/
static ossl_inline int ktls_start(int fd,
struct tls12_crypto_info_aes_gcm_128
*crypto_info, size_t len, int is_tx)
{
if (is_tx)
return setsockopt(fd, SOL_TLS, TLS_TX, crypto_info,
sizeof(*crypto_info)) ? 0 : 1;
else
return 0;
return setsockopt(fd, SOL_TLS, is_tx ? TLS_TX : TLS_RX,
crypto_info, sizeof(*crypto_info)) ? 0 : 1;
}
/*
@ -121,12 +130,15 @@ static ossl_inline int ktls_send_ctrl_message(int fd, unsigned char record_type,
struct msghdr msg;
int cmsg_len = sizeof(record_type);
struct cmsghdr *cmsg;
char buf[CMSG_SPACE(cmsg_len)];
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(unsigned char))];
} cmsgbuf;
struct iovec msg_iov; /* Vector of data to send/receive into */
memset(&msg, 0, sizeof(msg));
msg.msg_control = buf;
msg.msg_controllen = sizeof(buf);
msg.msg_control = cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_TLS;
cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
@ -142,7 +154,76 @@ static ossl_inline int ktls_send_ctrl_message(int fd, unsigned char record_type,
return sendmsg(fd, &msg, 0);
}
# endif /* KERNEL_VERSION */
# endif /* OPENSSL_SYS_LINUX */
# endif /* HEADER_INTERNAL_KTLS */
#endif /* OPENSSL_NO_KTLS */
# define K_MIN1_RX 17
# if LINUX_VERSION_CODE < KERNEL_VERSION(K_MAJ, K_MIN1_RX, K_MIN2)
# ifndef PEDANTIC
# warning "KTLS requires Kernel Headers >= 4.17.0 for receiving"
# warning "Skipping Compilation of KTLS receive data path"
# endif
static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
{
return -1;
}
# else
/*
* Receive a TLS record using the crypto_info provided in ktls_start.
* The kernel strips the TLS record header, IV and authentication tag,
* returning only the plaintext data or an error on failure.
* We add the TLS record header here to satisfy routines in rec_layer_s3.c
*/
static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
{
struct msghdr msg;
struct cmsghdr *cmsg;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(unsigned char))];
} cmsgbuf;
struct iovec msg_iov;
int ret;
unsigned char *p = data;
const size_t prepend_length = SSL3_RT_HEADER_LENGTH;
if (length < prepend_length + EVP_GCM_TLS_TAG_LEN) {
errno = EINVAL;
return -1;
}
memset(&msg, 0, sizeof(msg));
msg.msg_control = cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
msg_iov.iov_base = p + prepend_length;
msg_iov.iov_len = length - prepend_length - EVP_GCM_TLS_TAG_LEN;
msg.msg_iov = &msg_iov;
msg.msg_iovlen = 1;
ret = recvmsg(fd, &msg, 0);
if (ret < 0)
return ret;
if (msg.msg_controllen > 0) {
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg->cmsg_type == TLS_GET_RECORD_TYPE) {
p[0] = *((unsigned char *)CMSG_DATA(cmsg));
p[1] = TLS1_2_VERSION_MAJOR;
p[2] = TLS1_2_VERSION_MINOR;
/* returned length is limited to msg_iov.iov_len above */
p[3] = (ret >> 8) & 0xff;
p[4] = ret & 0xff;
ret += prepend_length;
}
}
return ret;
}
# endif
# endif
# endif
# endif
#endif