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-rw-r--r--src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c66
1 files changed, 33 insertions, 33 deletions
diff --git a/src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c b/src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c
index ff462ec..3b466a7 100644
--- a/src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c
+++ b/src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c
@@ -87,15 +87,18 @@ typedef struct _protocol_handshake {
uint8_t shared_handshake_key[HASHBYTES];
} protocol_handshake;
-struct _fastd_protocol_peer_state {
- bool old_session_key_valid;
- uint8_t old_session_key[HASHBYTES];
-
- bool session_key_valid;
- uint8_t session_key[HASHBYTES];
+typedef struct _protocol_session {
+ bool valid;
+ uint8_t key[HASHBYTES];
+ struct timespec since;
uint8_t send_nonce[NONCEBYTES];
uint8_t receive_nonce[NONCEBYTES];
+} protocol_session;
+
+struct _fastd_protocol_peer_state {
+ protocol_session old_session;
+ protocol_session session;
protocol_handshake *initiating_handshake;
protocol_handshake *accepting_handshake;
@@ -267,8 +270,8 @@ static char* protocol_peer_str(const fastd_context *ctx, const fastd_peer *peer)
static void create_peer_state(fastd_context *ctx, fastd_peer *peer) {
peer->protocol_state = malloc(sizeof(fastd_protocol_peer_state));
- peer->protocol_state->old_session_key_valid = false;
- peer->protocol_state->session_key_valid = false;
+ peer->protocol_state->old_session.valid = false;
+ peer->protocol_state->session.valid = false;
peer->protocol_state->initiating_handshake = NULL;
peer->protocol_state->accepting_handshake = NULL;
}
@@ -385,11 +388,14 @@ static void respond_handshake(fastd_context *ctx, fastd_peer *peer) {
static void establish(fastd_context *ctx, fastd_peer *peer, bool initiator) {
int i;
- peer->protocol_state->send_nonce[0] = initiator ? 3 : 2;
- peer->protocol_state->receive_nonce[0] = initiator ? 0 : 1;
+ peer->protocol_state->session.valid = true;
+ peer->protocol_state->session.since = ctx->now;
+
+ peer->protocol_state->session.send_nonce[0] = initiator ? 3 : 2;
+ peer->protocol_state->session.receive_nonce[0] = initiator ? 0 : 1;
for (i = 1; i < NONCEBYTES; i++) {
- peer->protocol_state->send_nonce[i] = 0;
- peer->protocol_state->receive_nonce[i] = 0;
+ peer->protocol_state->session.send_nonce[i] = 0;
+ peer->protocol_state->session.receive_nonce[i] = 0;
}
pr_info(ctx, "Connection with %P established.", peer);
@@ -457,18 +463,15 @@ static void finish_handshake(fastd_context *ctx, fastd_peer *peer, uint8_t t[HMA
fastd_task_put_send(ctx, peer, buffer);
- if (peer->protocol_state->session_key_valid) {
- memcpy(peer->protocol_state->old_session_key, peer->protocol_state->session_key, HASHBYTES);
- peer->protocol_state->old_session_key_valid = true;
- }
+ if (peer->protocol_state->session.valid)
+ peer->protocol_state->old_session = peer->protocol_state->session;
memcpy(hashinput, peer->protocol_state->initiating_handshake->public_key.p, PUBLICKEYBYTES);
memcpy(hashinput+PUBLICKEYBYTES, peer->protocol_state->initiating_handshake->peer_key.p, PUBLICKEYBYTES);
memcpy(hashinput+2*PUBLICKEYBYTES, ctx->conf->protocol_config->public_key.p, PUBLICKEYBYTES);
memcpy(hashinput+3*PUBLICKEYBYTES, peer->config->protocol_config->public_key.p, PUBLICKEYBYTES);
memcpy(hashinput+4*PUBLICKEYBYTES, peer->protocol_state->initiating_handshake->sigma.p, PUBLICKEYBYTES);
- crypto_hash_sha256(peer->protocol_state->session_key, hashinput, 5*PUBLICKEYBYTES);
- peer->protocol_state->session_key_valid = true;
+ crypto_hash_sha256(peer->protocol_state->session.key, hashinput, 5*PUBLICKEYBYTES);
establish(ctx, peer, true);
}
@@ -484,18 +487,15 @@ static void handle_finish_handshake(fastd_context *ctx, fastd_peer *peer, uint8_
return;
}
- if (peer->protocol_state->session_key_valid) {
- memcpy(peer->protocol_state->old_session_key, peer->protocol_state->session_key, HASHBYTES);
- peer->protocol_state->old_session_key_valid = true;
- }
+ if (peer->protocol_state->session.valid)
+ peer->protocol_state->old_session = peer->protocol_state->session;
memcpy(hashinput, peer->protocol_state->accepting_handshake->peer_key.p, PUBLICKEYBYTES);
memcpy(hashinput+PUBLICKEYBYTES, peer->protocol_state->accepting_handshake->public_key.p, PUBLICKEYBYTES);
memcpy(hashinput+2*PUBLICKEYBYTES, peer->config->protocol_config->public_key.p, PUBLICKEYBYTES);
memcpy(hashinput+3*PUBLICKEYBYTES, ctx->conf->protocol_config->public_key.p, PUBLICKEYBYTES);
memcpy(hashinput+4*PUBLICKEYBYTES, peer->protocol_state->accepting_handshake->sigma.p, PUBLICKEYBYTES);
- crypto_hash_sha256(peer->protocol_state->session_key, hashinput, 5*PUBLICKEYBYTES);
- peer->protocol_state->session_key_valid = true;
+ crypto_hash_sha256(peer->protocol_state->session.key, hashinput, 5*PUBLICKEYBYTES);
establish(ctx, peer, false);
}
@@ -605,12 +605,12 @@ static void protocol_handle_recv(fastd_context *ctx, fastd_peer *peer, fastd_buf
}
}
else {
- if (!peer->protocol_state || !peer->protocol_state->session_key_valid) {
+ if (!peer->protocol_state || !peer->protocol_state->session.valid) {
pr_debug(ctx, "received unexpected non-handshake packet from %P", peer);
goto end;
}
- if (!is_nonce_valid(buffer.data, peer->protocol_state->receive_nonce)) {
+ if (!is_nonce_valid(buffer.data, peer->protocol_state->session.receive_nonce)) {
pr_debug(ctx, "received packet with invalid nonce from %P", peer);
goto end;
}
@@ -624,7 +624,7 @@ static void protocol_handle_recv(fastd_context *ctx, fastd_peer *peer, fastd_buf
fastd_buffer recv_buffer = fastd_buffer_alloc(buffer.len, 0, 0);
- if (crypto_secretbox_xsalsa20poly1305_open(recv_buffer.data, buffer.data, buffer.len, nonce, peer->protocol_state->session_key) != 0) {
+ if (crypto_secretbox_xsalsa20poly1305_open(recv_buffer.data, buffer.data, buffer.len, nonce, peer->protocol_state->session.key) != 0) {
pr_debug(ctx, "verification failed for packet received from %P", peer);
goto end;
}
@@ -632,7 +632,7 @@ static void protocol_handle_recv(fastd_context *ctx, fastd_peer *peer, fastd_buf
fastd_buffer_push_head(&recv_buffer, crypto_secretbox_xsalsa20poly1305_ZEROBYTES);
fastd_task_put_handle_recv(ctx, peer, recv_buffer);
- memcpy(peer->protocol_state->receive_nonce, nonce, NONCEBYTES);
+ memcpy(peer->protocol_state->session.receive_nonce, nonce, NONCEBYTES);
}
end:
@@ -640,7 +640,7 @@ static void protocol_handle_recv(fastd_context *ctx, fastd_peer *peer, fastd_buf
}
static void protocol_send(fastd_context *ctx, fastd_peer *peer, fastd_buffer buffer) {
- if (!peer->protocol_state || !peer->protocol_state->session_key_valid) {
+ if (!peer->protocol_state || !peer->protocol_state->session.valid) {
fastd_buffer_free(buffer);
return;
}
@@ -651,19 +651,19 @@ static void protocol_send(fastd_context *ctx, fastd_peer *peer, fastd_buffer buf
fastd_buffer send_buffer = fastd_buffer_alloc(buffer.len, 0, 0);
uint8_t nonce[crypto_secretbox_xsalsa20poly1305_NONCEBYTES];
- memcpy(nonce, peer->protocol_state->send_nonce, NONCEBYTES);
+ memcpy(nonce, peer->protocol_state->session.send_nonce, NONCEBYTES);
memset(nonce+NONCEBYTES, 0, crypto_secretbox_xsalsa20poly1305_NONCEBYTES-NONCEBYTES);
- crypto_secretbox_xsalsa20poly1305(send_buffer.data, buffer.data, buffer.len, nonce, peer->protocol_state->session_key);
+ crypto_secretbox_xsalsa20poly1305(send_buffer.data, buffer.data, buffer.len, nonce, peer->protocol_state->session.key);
fastd_buffer_free(buffer);
fastd_buffer_push_head(&send_buffer, crypto_secretbox_xsalsa20poly1305_BOXZEROBYTES-NONCEBYTES);
- memcpy(send_buffer.data, peer->protocol_state->send_nonce, NONCEBYTES);
+ memcpy(send_buffer.data, peer->protocol_state->session.send_nonce, NONCEBYTES);
fastd_task_put_send(ctx, peer, send_buffer);
- increment_nonce(peer->protocol_state->send_nonce);
+ increment_nonce(peer->protocol_state->session.send_nonce);
}
static void protocol_free_peer_state(fastd_context *ctx, fastd_peer *peer) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 14:33:03 +0100