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-rw-r--r--src/protocol_ec25519_fhmqvc.c45
1 files changed, 28 insertions, 17 deletions
diff --git a/src/protocol_ec25519_fhmqvc.c b/src/protocol_ec25519_fhmqvc.c
index 45a94f0..b020530 100644
--- a/src/protocol_ec25519_fhmqvc.c
+++ b/src/protocol_ec25519_fhmqvc.c
@@ -64,7 +64,11 @@ typedef struct handshake_key {
struct timespec preferred_till;
struct timespec valid_till;
- keypair_t key;
+ /* keypair used as initiator */
+ keypair_t key1;
+
+ /* keypair used as responder */
+ keypair_t key2;
} handshake_key_t;
struct fastd_protocol_state {
@@ -260,7 +264,8 @@ static void maintenance(fastd_context_t *ctx) {
ctx->protocol_state->handshake_key.serial++;
- new_handshake_key(ctx, &ctx->protocol_state->handshake_key.key);
+ new_handshake_key(ctx, &ctx->protocol_state->handshake_key.key1);
+ new_handshake_key(ctx, &ctx->protocol_state->handshake_key.key2);
ctx->protocol_state->handshake_key.preferred_till = ctx->now;
ctx->protocol_state->handshake_key.preferred_till.tv_sec += 15;
@@ -282,7 +287,7 @@ static void protocol_handshake_init(fastd_context_t *ctx, const fastd_socket_t *
else
pr_debug(ctx, "sending handshake to unknown peer %I", remote_addr);
- fastd_handshake_add(ctx, &buffer, RECORD_SENDER_HANDSHAKE_KEY, PUBLICKEYBYTES, ctx->protocol_state->handshake_key.key.public.p);
+ fastd_handshake_add(ctx, &buffer, RECORD_SENDER_HANDSHAKE_KEY, PUBLICKEYBYTES, ctx->protocol_state->handshake_key.key1.public.p);
fastd_send_handshake(ctx, sock, local_addr, remote_addr, buffer);
}
@@ -296,7 +301,7 @@ static bool update_shared_handshake_key(fastd_context_t *ctx, const fastd_peer_t
fastd_sha256_t hashbuf;
fastd_sha256_blocks(&hashbuf,
- handshake_key->key.public.p,
+ handshake_key->key2.public.p,
peer_handshake_key->p,
ctx->conf->protocol_config->key.public.p,
peer->protocol_config->public_key.p,
@@ -311,7 +316,7 @@ static bool update_shared_handshake_key(fastd_context_t *ctx, const fastd_peer_t
e.p[15] |= 0x80;
ecc_25519_gf_mult(&eb, &e, &ctx->conf->protocol_config->key.secret);
- ecc_25519_gf_add(&s, &eb, &handshake_key->key.secret);
+ ecc_25519_gf_add(&s, &eb, &handshake_key->key2.secret);
ecc_25519_work_t work, workX;
if (!ecc_25519_load_packed(&workX, peer_handshake_key))
@@ -334,7 +339,7 @@ static bool update_shared_handshake_key(fastd_context_t *ctx, const fastd_peer_t
ecc_25519_store_packed(&peer->protocol_state->sigma, &work);
fastd_sha256_blocks(&peer->protocol_state->shared_handshake_key,
- handshake_key->key.public.p,
+ handshake_key->key2.public.p,
peer_handshake_key->p,
ctx->conf->protocol_config->key.public.p,
peer->protocol_config->public_key.p,
@@ -363,13 +368,13 @@ static void respond_handshake(fastd_context_t *ctx, const fastd_socket_t *sock,
return;
fastd_sha256_t hmacbuf;
- fastd_hmacsha256_blocks(&hmacbuf, peer->protocol_state->shared_handshake_key.w, ctx->conf->protocol_config->key.public.p, handshake_key->key.public.p, NULL);
+ fastd_hmacsha256_blocks(&hmacbuf, peer->protocol_state->shared_handshake_key.w, ctx->conf->protocol_config->key.public.p, handshake_key->key2.public.p, NULL);
fastd_buffer_t buffer = fastd_handshake_new_reply(ctx, handshake, method, 4*(4+PUBLICKEYBYTES) + 4+HASHBYTES);
fastd_handshake_add(ctx, &buffer, RECORD_SENDER_KEY, PUBLICKEYBYTES, ctx->conf->protocol_config->key.public.p);
fastd_handshake_add(ctx, &buffer, RECORD_RECEIPIENT_KEY, PUBLICKEYBYTES, peer->protocol_config->public_key.p);
- fastd_handshake_add(ctx, &buffer, RECORD_SENDER_HANDSHAKE_KEY, PUBLICKEYBYTES, handshake_key->key.public.p);
+ fastd_handshake_add(ctx, &buffer, RECORD_SENDER_HANDSHAKE_KEY, PUBLICKEYBYTES, handshake_key->key2.public.p);
fastd_handshake_add(ctx, &buffer, RECORD_RECEIPIENT_HANDSHAKE_KEY, PUBLICKEYBYTES, peer_handshake_key->p);
fastd_handshake_add(ctx, &buffer, RECORD_T, HASHBYTES, hmacbuf.b);
@@ -440,7 +445,7 @@ static void finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock, const f
fastd_sha256_t hashbuf;
fastd_sha256_blocks(&hashbuf,
peer_handshake_key->p,
- handshake_key->key.public.p,
+ handshake_key->key1.public.p,
peer->protocol_config->public_key.p,
ctx->conf->protocol_config->key.public.p,
NULL);
@@ -454,7 +459,7 @@ static void finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock, const f
e.p[15] |= 0x80;
ecc_25519_gf_mult(&da, &d, &ctx->conf->protocol_config->key.secret);
- ecc_25519_gf_add(&s, &da, &handshake_key->key.secret);
+ ecc_25519_gf_add(&s, &da, &handshake_key->key1.secret);
ecc_25519_work_t work, workY;
if (!ecc_25519_load_packed(&workY, peer_handshake_key))
@@ -480,7 +485,7 @@ static void finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock, const f
fastd_sha256_t shared_handshake_key;
fastd_sha256_blocks(&shared_handshake_key,
peer_handshake_key->p,
- handshake_key->key.public.p,
+ handshake_key->key1.public.p,
peer->protocol_config->public_key.p,
ctx->conf->protocol_config->key.public.p,
sigma.p,
@@ -492,9 +497,9 @@ static void finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock, const f
}
fastd_sha256_t hmacbuf;
- fastd_hmacsha256_blocks(&hmacbuf, shared_handshake_key.w, ctx->conf->protocol_config->key.public.p, handshake_key->key.public.p, NULL);
+ fastd_hmacsha256_blocks(&hmacbuf, shared_handshake_key.w, ctx->conf->protocol_config->key.public.p, handshake_key->key1.public.p, NULL);
- if (!establish(ctx, peer, method, sock, local_addr, remote_addr, true, &handshake_key->key.public, peer_handshake_key, &ctx->conf->protocol_config->key.public,
+ if (!establish(ctx, peer, method, sock, local_addr, remote_addr, true, &handshake_key->key1.public, peer_handshake_key, &ctx->conf->protocol_config->key.public,
&peer->protocol_config->public_key, &sigma, handshake_key->serial))
return;
@@ -502,7 +507,7 @@ static void finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock, const f
fastd_handshake_add(ctx, &buffer, RECORD_SENDER_KEY, PUBLICKEYBYTES, ctx->conf->protocol_config->key.public.p);
fastd_handshake_add(ctx, &buffer, RECORD_RECEIPIENT_KEY, PUBLICKEYBYTES, peer->protocol_config->public_key.p);
- fastd_handshake_add(ctx, &buffer, RECORD_SENDER_HANDSHAKE_KEY, PUBLICKEYBYTES, handshake_key->key.public.p);
+ fastd_handshake_add(ctx, &buffer, RECORD_SENDER_HANDSHAKE_KEY, PUBLICKEYBYTES, handshake_key->key1.public.p);
fastd_handshake_add(ctx, &buffer, RECORD_RECEIPIENT_HANDSHAKE_KEY, PUBLICKEYBYTES, peer_handshake_key->p);
fastd_handshake_add(ctx, &buffer, RECORD_T, HASHBYTES, hmacbuf.b);
@@ -522,7 +527,7 @@ static void handle_finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock,
return;
}
- establish(ctx, peer, method, sock, local_addr, remote_addr, false, peer_handshake_key, &handshake_key->key.public, &peer->protocol_config->public_key,
+ establish(ctx, peer, method, sock, local_addr, remote_addr, false, peer_handshake_key, &handshake_key->key2.public, &peer->protocol_config->public_key,
&ctx->conf->protocol_config->key.public, &peer->protocol_state->sigma, handshake_key->serial);
clear_shared_handshake_key(ctx, peer);
@@ -612,6 +617,10 @@ static inline fastd_peer_t* add_temporary(fastd_context_t *ctx, const fastd_peer
return peer;
}
+static inline keypair_t* get_handshake_keypair(handshake_key_t *handshake_key, uint8_t type) {
+ return (type % 2) ? &handshake_key->key2 : &handshake_key->key1;
+}
+
static void protocol_handshake_handle(fastd_context_t *ctx, fastd_socket_t *sock, const fastd_peer_address_t *local_addr, const fastd_peer_address_t *remote_addr, fastd_peer_t *peer, const fastd_handshake_t *handshake, const fastd_method_t *method) {
char *peer_version_name = NULL;
bool temporary_added = false;
@@ -711,10 +720,12 @@ static void protocol_handshake_handle(fastd_context_t *ctx, fastd_socket_t *sock
}
handshake_key_t *handshake_key;
- if (is_handshake_key_valid(ctx, &ctx->protocol_state->handshake_key) && memcmp(ctx->protocol_state->handshake_key.key.public.p, handshake->records[RECORD_RECEIPIENT_HANDSHAKE_KEY].data, PUBLICKEYBYTES) == 0) {
+ if (is_handshake_key_valid(ctx, &ctx->protocol_state->handshake_key) &&
+ memcmp(get_handshake_keypair(&ctx->protocol_state->handshake_key, handshake->type)->public.p, handshake->records[RECORD_RECEIPIENT_HANDSHAKE_KEY].data, PUBLICKEYBYTES) == 0) {
handshake_key = &ctx->protocol_state->handshake_key;
}
- else if (is_handshake_key_valid(ctx, &ctx->protocol_state->prev_handshake_key) && memcmp(ctx->protocol_state->prev_handshake_key.key.public.p, handshake->records[RECORD_RECEIPIENT_HANDSHAKE_KEY].data, PUBLICKEYBYTES) == 0) {
+ else if (is_handshake_key_valid(ctx, &ctx->protocol_state->prev_handshake_key) &&
+ memcmp(get_handshake_keypair(&ctx->protocol_state->prev_handshake_key, handshake->type)->public.p, handshake->records[RECORD_RECEIPIENT_HANDSHAKE_KEY].data, PUBLICKEYBYTES) == 0) {
handshake_key = &ctx->protocol_state->prev_handshake_key;
}
else {
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-13 22:40:39 +0100