solana/token_bridge: prevent self attestations

Change-Id: Iac42e8dcc9f04c1035334ec021c7d4ab11857227

solana/modules/token_bridge/program/src/api/attest.rs

@@ -26,6 +26,7 @@ use bridge::{
     },
     types::ConsistencyLevel,
     vaa::SerializePayload,
+    CHAIN_ID_SOLANA,
 };
 use primitive_types::U256;
 use solana_program::{
@@ -141,7 +142,7 @@ pub fn attest_token(
     // Create Asset Metadata
     let mut payload = PayloadAssetMeta {
         token_address: accs.mint.info().key.to_bytes(),
-        token_chain: 1,
+        token_chain: CHAIN_ID_SOLANA,
         decimals: accs.mint.decimals,
         symbol: "".to_string(),
         name: "".to_string(),

solana/modules/token_bridge/program/src/api/create_wrapped.rs

@@ -13,8 +13,12 @@ use crate::{
     },
     messages::PayloadAssetMeta,
     types::*,
+    TokenBridgeError::InvalidChain,
+};
+use bridge::{
+    vaa::ClaimableVAA,
+    CHAIN_ID_SOLANA,
 };
-use bridge::vaa::ClaimableVAA;
 use solana_program::{
     account_info::AccountInfo,
     program::invoke_signed,
@@ -101,6 +105,11 @@ pub fn create_wrapped(
 ) -> Result<()> {
     use bstr::ByteSlice;
 
+    // Do not process attestations sourced from the current chain.
+    if accs.vaa.token_chain == CHAIN_ID_SOLANA {
+        return Err(InvalidChain.into());
+    }
+
     let derivation_data: WrappedDerivationData = (&*accs).into();
     accs.mint
         .verify_derivation(ctx.program_id, &derivation_data)?;

solana/modules/token_bridge/program/src/api/transfer.rs

@@ -29,6 +29,7 @@ use bridge::{
     },
     types::ConsistencyLevel,
     vaa::SerializePayload,
+    CHAIN_ID_SOLANA,
 };
 use primitive_types::U256;
 use solana_program::{
@@ -192,7 +193,7 @@ pub fn transfer_native(
     let payload = PayloadTransfer {
         amount: U256::from(amount),
         token_address: accs.mint.info().key.to_bytes(),
-        token_chain: 1,
+        token_chain: CHAIN_ID_SOLANA,
         to: data.target_address,
         to_chain: data.target_chain,
         fee: U256::from(fee),