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bol-van
2024-10-28 09:32:24 +03:00
commit 2aaa2f7cf3
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133
docs/wireguard/010-wg-mod.patch Normal file
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@@ -0,0 +1,133 @@
Index: WireGuard-0.0.20190123/src/cookie.c
===================================================================
--- WireGuard-0.0.20190123.orig/src/cookie.c
+++ WireGuard-0.0.20190123/src/cookie.c
@@ -193,6 +193,8 @@ void wg_cookie_message_create(struct mes
xchacha20poly1305_encrypt(dst->encrypted_cookie, cookie, COOKIE_LEN,
macs->mac1, COOKIE_LEN, dst->nonce,
checker->cookie_encryption_key);
+ // MOD : randomize trash
+ dst->header.trash = gen_trash();
}
void wg_cookie_message_consume(struct message_handshake_cookie *src,
Index: WireGuard-0.0.20190123/src/messages.h
===================================================================
--- WireGuard-0.0.20190123.orig/src/messages.h
+++ WireGuard-0.0.20190123/src/messages.h
@@ -53,23 +53,41 @@ enum limits {
MAX_QUEUED_PACKETS = 1024 /* TODO: replace this with DQL */
};
+/*
enum message_type {
- MESSAGE_INVALID = 0,
- MESSAGE_HANDSHAKE_INITIATION = 1,
- MESSAGE_HANDSHAKE_RESPONSE = 2,
- MESSAGE_HANDSHAKE_COOKIE = 3,
- MESSAGE_DATA = 4
+ MESSAGE_INVALID = 0,
+ MESSAGE_HANDSHAKE_INITIATION = 1,
+ MESSAGE_HANDSHAKE_RESPONSE = 2,
+ MESSAGE_HANDSHAKE_COOKIE = 3,
+ MESSAGE_DATA = 4
};
+*/
+
+// MOD : message type
+enum message_type {
+ MESSAGE_INVALID = 0xE319CCD0,
+ MESSAGE_HANDSHAKE_INITIATION = 0x48ADE198,
+ MESSAGE_HANDSHAKE_RESPONSE = 0xFCA6A8F3,
+ MESSAGE_HANDSHAKE_COOKIE = 0x64A3BB18,
+ MESSAGE_DATA = 0x391820AA
+};
+
+// MOD : generate fast trash without true RNG
+__le32 gen_trash(void);
struct message_header {
- /* The actual layout of this that we want is:
- * u8 type
- * u8 reserved_zero[3]
- *
- * But it turns out that by encoding this as little endian,
- * we achieve the same thing, and it makes checking faster.
- */
- __le32 type;
+ /* The actual layout of this that we want is:
+ * u8 type
+ * u8 reserved_zero[3]
+ *
+ * But it turns out that by encoding this as little endian,
+ * we achieve the same thing, and it makes checking faster.
+ */
+
+ // MOD : trash field to change message size and add 4 byte offset to all fields
+ __le32 trash;
+
+ __le32 type;
};
struct message_macs {
Index: WireGuard-0.0.20190123/src/noise.c
===================================================================
--- WireGuard-0.0.20190123.orig/src/noise.c
+++ WireGuard-0.0.20190123/src/noise.c
@@ -17,6 +17,24 @@
#include <linux/highmem.h>
#include <crypto/algapi.h>
+
+// MOD : trash generator
+__le32 gtrash = 0;
+__le32 gen_trash(void)
+{
+ if (gtrash)
+ gtrash = gtrash*1103515243 + 12345;
+ else
+ // first value is true random
+ get_random_bytes_wait(&gtrash, sizeof(gtrash));
+ return gtrash;
+}
+
/* This implements Noise_IKpsk2:
*
* <- s
@@ -515,6 +533,10 @@ wg_noise_handshake_create_initiation(str
&handshake->entry);
handshake->state = HANDSHAKE_CREATED_INITIATION;
+
+ // MOD : randomize trash
+ dst->header.trash = gen_trash();
+
ret = true;
out:
@@ -655,6 +677,10 @@ bool wg_noise_handshake_create_response(
&handshake->entry);
handshake->state = HANDSHAKE_CREATED_RESPONSE;
+
+ // MOD : randomize trash
+ dst->header.trash = gen_trash();
+
ret = true;
out:
Index: WireGuard-0.0.20190123/src/send.c
===================================================================
--- WireGuard-0.0.20190123.orig/src/send.c
+++ WireGuard-0.0.20190123/src/send.c
@@ -200,6 +200,10 @@ static bool encrypt_packet(struct sk_buf
header->header.type = cpu_to_le32(MESSAGE_DATA);
header->key_idx = keypair->remote_index;
header->counter = cpu_to_le64(PACKET_CB(skb)->nonce);
+
+ // MOD : randomize trash
+ header->header.trash = gen_trash();
+
pskb_put(skb, trailer, trailer_len);
/* Now we can encrypt the scattergather segments */