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-rw-r--r--src/CMakeLists.txt1
-rw-r--r--src/fastd.c5
-rw-r--r--src/fastd.h2
-rw-r--r--src/linux_alg.c114
-rw-r--r--src/linux_alg.h39
-rw-r--r--src/method_aes128_gcm.c24
6 files changed, 182 insertions, 3 deletions
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 29e3ba5..61dcbc6 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -17,6 +17,7 @@ add_executable(fastd
fastd.c
config.c
handshake.c
+ linux_alg.c
peer.c
printf.c
queue.c
diff --git a/src/fastd.c b/src/fastd.c
index 3bbf30f..ec70c6c 100644
--- a/src/fastd.c
+++ b/src/fastd.c
@@ -28,6 +28,7 @@
#include "fastd.h"
#include "handshake.h"
+#include "linux_alg.h"
#include "peer.h"
#include "task.h"
@@ -784,6 +785,8 @@ int main(int argc, char *argv[]) {
init_log(&ctx);
+ fastd_linux_alg_init(&ctx);
+
if (conf.generate_key) {
conf.protocol->generate_key(&ctx);
exit(0);
@@ -857,6 +860,8 @@ int main(int argc, char *argv[]) {
free(ctx.protocol_state);
free(ctx.eth_addr);
+ fastd_linux_alg_close(&ctx);
+
close_log(&ctx);
fastd_config_release(&ctx, &conf);
diff --git a/src/fastd.h b/src/fastd.h
index e1c531b..80ec0d2 100644
--- a/src/fastd.h
+++ b/src/fastd.h
@@ -215,6 +215,8 @@ struct _fastd_context {
int sockfd;
int sock6fd;
+ int algfd_ghash;
+
size_t eth_addr_size;
size_t n_eth_addr;
fastd_peer_eth_addr *eth_addr;
diff --git a/src/linux_alg.c b/src/linux_alg.c
new file mode 100644
index 0000000..70f4752
--- /dev/null
+++ b/src/linux_alg.c
@@ -0,0 +1,114 @@
+/*
+ Copyright (c) 2012, Matthias Schiffer <mschiffer@universe-factory.net>
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include "linux_alg.h"
+
+#include <linux/if_alg.h>
+#include <unistd.h>
+
+
+#ifndef SOL_ALG
+#define SOL_ALG 279
+#endif
+
+
+void fastd_linux_alg_init(fastd_context *ctx) {
+ ctx->algfd_ghash = socket(AF_ALG, SOCK_SEQPACKET, 0);
+ if (ctx->algfd_ghash < 0)
+ goto error_ghash;
+
+ struct sockaddr_alg sa_ghash = {};
+ sa_ghash.salg_family = AF_ALG;
+ strcpy((char*)sa_ghash.salg_type, "hash");
+ strcpy((char*)sa_ghash.salg_name, "ghash");
+ if (bind(ctx->algfd_ghash, (struct sockaddr*)&sa_ghash, sizeof(sa_ghash)) < 0) {
+ close(ctx->algfd_ghash);
+ goto error_ghash;
+ }
+
+ return;
+
+ error_ghash:
+ pr_info(ctx, "no kernel support for GHASH was found, falling back to userspace implementation");
+ ctx->algfd_ghash = -1;
+}
+
+void fastd_linux_alg_close(fastd_context *ctx) {
+ if (ctx->algfd_ghash >= 0)
+ close(ctx->algfd_ghash);
+}
+
+
+int fastd_linux_alg_ghash_init(fastd_context *ctx, uint8_t key[16]) {
+ if (ctx->algfd_ghash < 0)
+ return -1;
+
+ if (setsockopt(ctx->algfd_ghash, SOL_ALG, ALG_SET_KEY, key, 16) < 0) {
+ pr_error_errno(ctx, "fastd_linux_alg_ghash_init: setsockopt");
+ return -1;
+ }
+
+ int ret = accept(ctx->algfd_ghash, NULL, NULL);
+
+ if (ret < 0) {
+ pr_error_errno(ctx, "fastd_linux_alg_ghash_init: accept");
+ return -1;
+ }
+
+ return ret;
+}
+
+bool fastd_linux_alg_ghash(fastd_context *ctx, int fd, uint8_t out[16], const void *data, size_t len) {
+ if (!len)
+ return false;
+
+ const uint8_t *in = data;
+ const uint8_t *end = in+len;
+
+ while (in < end) {
+ int bytes = write(fd, in, end-in);
+ if (bytes < 0) {
+ pr_error_errno(ctx, "fastd_linux_alg_ghash: write");
+ return false;
+ }
+
+ in += bytes;
+ }
+
+ end = out+16;
+
+ while (out < end) {
+ int bytes = read(fd, out, end-out);
+ if (bytes < 0) {
+ pr_error_errno(ctx, "fastd_linux_alg_ghash: read");
+ return false;
+ }
+
+ out += bytes;
+ }
+
+ return true;
+}
diff --git a/src/linux_alg.h b/src/linux_alg.h
new file mode 100644
index 0000000..e10f23a
--- /dev/null
+++ b/src/linux_alg.h
@@ -0,0 +1,39 @@
+/*
+ Copyright (c) 2012, Matthias Schiffer <mschiffer@universe-factory.net>
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef _FASTD_LINUX_ALG_H_
+#define _FASTD_LINUX_ALG_H_
+
+#include "fastd.h"
+
+
+void fastd_linux_alg_init(fastd_context *ctx);
+void fastd_linux_alg_close(fastd_context *ctx);
+
+int fastd_linux_alg_ghash_init(fastd_context *ctx, uint8_t key[16]);
+bool fastd_linux_alg_ghash(fastd_context *ctx, int fd, uint8_t out[16], const void *data, size_t len);
+
+#endif /* _FASTD_LINUX_ALG_H_ */
diff --git a/src/method_aes128_gcm.c b/src/method_aes128_gcm.c
index 9f2d6b4..86203a2 100644
--- a/src/method_aes128_gcm.c
+++ b/src/method_aes128_gcm.c
@@ -25,7 +25,10 @@
#include "fastd.h"
+#include "linux_alg.h"
+
#include <crypto_stream_aes128ctr.h>
+#include <unistd.h>
#define NONCEBYTES 7
@@ -50,6 +53,8 @@ struct _fastd_method_session_state {
struct timespec receive_last;
uint64_t receive_reorder_seen;
+
+ int algfd_ghash;
};
@@ -179,6 +184,8 @@ static fastd_method_session_state* method_session_init(fastd_context *ctx, uint8
}
}
+ session->algfd_ghash = fastd_linux_alg_ghash_init(ctx, Hbase[0].b);
+
session->send_nonce[0] = initiator ? 3 : 2;
session->receive_nonce[0] = initiator ? 0 : 1;
@@ -204,6 +211,8 @@ static bool method_session_want_refresh(fastd_context *ctx, fastd_method_session
static void method_session_free(fastd_context *ctx, fastd_method_session_state *session) {
if(session) {
+ close(session->algfd_ghash);
+
memset(session, 0, sizeof(fastd_method_session_state));
free(session);
}
@@ -236,7 +245,16 @@ static inline void put_size(block_t *out, size_t len) {
out->b[BLOCKBYTES-1] = len << 3;
}
-static inline void ghash(block_t *out, const block_t *blocks, size_t n_blocks, fastd_method_session_state *session) {
+static inline void ghash(fastd_context *ctx, block_t *out, const block_t *blocks, size_t n_blocks, fastd_method_session_state *session) {
+ if (session->algfd_ghash >= 0) {
+ if (fastd_linux_alg_ghash(ctx, session->algfd_ghash, out->b, blocks, n_blocks*BLOCKBYTES))
+ return;
+
+ /* on error */
+ close(session->algfd_ghash);
+ session->algfd_ghash = -1;
+ }
+
memset(out, 0, sizeof(block_t));
int i;
@@ -274,7 +292,7 @@ static bool method_encrypt(fastd_context *ctx, fastd_peer *peer, fastd_method_se
put_size(&outblocks[n_blocks], in.len);
block_t *sig = outblocks-1;
- ghash(sig, outblocks, n_blocks+1, session);
+ ghash(ctx, sig, outblocks, n_blocks+1, session);
xor_a(sig, &stream[0]);
fastd_buffer_free(in);
@@ -329,7 +347,7 @@ static bool method_decrypt(fastd_context *ctx, fastd_peer *peer, fastd_method_se
put_size(&inblocks[n_blocks], in.len);
block_t sig;
- ghash(&sig, inblocks, n_blocks+1, session);
+ ghash(ctx, &sig, inblocks, n_blocks+1, session);
xor_a(&sig, &stream[0]);
if (memcmp(&sig, inblocks-1, BLOCKBYTES) != 0) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 19:28:57 +0100