ledger: remove wasm downloader

.changelog/unreleased/improvements/3598-remove-wasm-loader.md

@@ -0,0 +1,2 @@
+- Do not try to download wasms artifacts from an untrusted source.
+  ([\#3598](https://github.com/anoma/namada/pull/3598))

crates/apps_lib/src/cli.rs

@@ -3267,7 +3267,6 @@ pub mod args {
         arg("destination-validator");
     pub const DISCORD_OPT: ArgOpt<String> = arg_opt("discord-handle");
     pub const DO_IT: ArgFlag = flag("do-it");
-    pub const DONT_PREFETCH_WASM: ArgFlag = flag("dont-prefetch-wasm");
     pub const DRY_RUN_TX: ArgFlag = flag("dry-run");
     pub const DRY_RUN_WRAPPER_TX: ArgFlag = flag("dry-run-wrapper");
     pub const DUMP_TX: ArgFlag = flag("dump-tx");
@@ -7767,7 +7766,6 @@ pub mod args {
         pub chain_id: ChainId,
         pub genesis_validator: Option<String>,
         pub pre_genesis_path: Option<PathBuf>,
-        pub dont_prefetch_wasm: bool,
         pub allow_duplicate_ip: bool,
         pub add_persistent_peers: bool,
     }
@@ -7777,14 +7775,12 @@ pub mod args {
             let chain_id = CHAIN_ID.parse(matches);
             let genesis_validator = GENESIS_VALIDATOR.parse(matches);
             let pre_genesis_path = PRE_GENESIS_PATH.parse(matches);
-            let dont_prefetch_wasm = DONT_PREFETCH_WASM.parse(matches);
             let allow_duplicate_ip = ALLOW_DUPLICATE_IP.parse(matches);
             let add_persistent_peers = ADD_PERSISTENT_PEERS.parse(matches);
             Self {
                 chain_id,
                 genesis_validator,
                 pre_genesis_path,
-                dont_prefetch_wasm,
                 allow_duplicate_ip,
                 add_persistent_peers,
             }
@@ -7795,9 +7791,6 @@ pub mod args {
                                           https://github.com/heliaxdev/anoma-network-config")))
                 .arg(GENESIS_VALIDATOR.def().help(wrap!("The alias of the genesis validator that you want to set up as, if any.")))
                 .arg(PRE_GENESIS_PATH.def().help(wrap!("The path to the pre-genesis directory for genesis validator, if any. Defaults to \"{base-dir}/pre-genesis/{genesis-validator}\".")))
-            .arg(DONT_PREFETCH_WASM.def().help(wrap!(
-                "Do not pre-fetch WASM.")
-            ))
             .arg(ALLOW_DUPLICATE_IP.def().help(wrap!(
                 "Toggle to disable guard against peers connecting from the \
                  same IP. This option shouldn't be used in mainnet.")

crates/apps_lib/src/client/utils.rs

@@ -54,7 +54,6 @@ pub async fn join_network(
         chain_id,
         genesis_validator,
         pre_genesis_path,
-        dont_prefetch_wasm,
         allow_duplicate_ip,
         add_persistent_peers,
     }: args::JoinNetwork,
@@ -250,9 +249,8 @@ pub async fn join_network(
         config.wasm_dir = wasm_dir_full;
     }
 
-    if !dont_prefetch_wasm {
-        fetch_wasms_aux(&chain_id, &config.wasm_dir).await;
-    }
+    // Validate the wasm artifacts checksums
+    validate_wasm_artifacts_aux(&chain_id, &config.wasm_dir).await;
 
     // Save the config and the wallet
     config.write(&base_dir, &chain_id, true).unwrap();
@@ -261,9 +259,9 @@ pub async fn join_network(
     println!("Successfully configured for chain ID {chain_id}");
 }
 
-async fn fetch_wasms_aux(chain_id: &ChainId, wasm_dir: &Path) {
-    println!("Fetching missing wasms for chain ID {chain_id}...");
-    wasm_loader::pre_fetch_wasm(wasm_dir).await;
+async fn validate_wasm_artifacts_aux(chain_id: &ChainId, wasm_dir: &Path) {
+    println!("Validating wasms artifacts for chain ID {chain_id}...");
+    wasm_loader::validate_wasm_artifacts(wasm_dir).await;
 }
 
 pub fn validate_wasm(args::ValidateWasm { code_path }: args::ValidateWasm) {

crates/apps_lib/src/wasm_loader/mod.rs

@@ -1,5 +1,4 @@
 //! A module for loading WASM files and downloading pre-built WASMs.
-use core::borrow::Borrow;
 use std::fs;
 use std::path::Path;
 
@@ -35,10 +34,6 @@ pub enum Error {
 #[serde(transparent)]
 pub struct Checksums(pub HashMap<String, String>);
 
-/// Github URL prefix of released Namada network configs
-pub const ENV_VAR_WASM_SERVER: &str = "NAMADA_NETWORK_WASM_SERVER";
-const DEFAULT_WASM_SERVER: &str = "https://artifacts.heliax.click/namada-wasm";
-
 impl Checksums {
     /// Read WASM checksums from the given path
     pub fn read_checksums_file(
@@ -115,12 +110,6 @@ impl Checksums {
     }
 }
 
-fn wasm_url(wasm_name: &str) -> String {
-    let prefix_url = std::env::var(ENV_VAR_WASM_SERVER)
-        .unwrap_or_else(|_| DEFAULT_WASM_SERVER.to_string());
-    format!("{}/{}", prefix_url, wasm_name)
-}
-
 fn valid_wasm_checksum(
     wasm_payload: &[u8],
     name: &str,
@@ -141,9 +130,8 @@ fn valid_wasm_checksum(
     }
 }
 
-/// Download all the pre-built wasms, or if they're already downloaded, verify
-/// their checksums.
-pub async fn pre_fetch_wasm(wasm_directory: impl AsRef<Path>) {
+/// Validate wasm artifacts
+pub async fn validate_wasm_artifacts(wasm_directory: impl AsRef<Path>) {
     // load json with wasm hashes
     let checksums = Checksums::read_checksums_async(&wasm_directory).await;
 
@@ -154,69 +142,29 @@ pub async fn pre_fetch_wasm(wasm_directory: impl AsRef<Path>) {
         tokio::spawn(async move {
             let wasm_path = wasm_directory.join(&full_name);
             match tokio::fs::read(&wasm_path).await {
-                // if the file exist, first check the hash. If not matching
-                // download it again.
+                // if the file exist, check the hash
                 Ok(bytes) => {
                     if let Err(derived_name) =
                         valid_wasm_checksum(&bytes, &name, &full_name)
                     {
                         tracing::info!(
                             "WASM checksum mismatch: Got {}, expected {}. \
-                             Fetching new version...",
+                             Check your wasms artifacts.",
                             derived_name,
                             full_name
                         );
-                    } else {
-                        return;
-                    }
-
-                    match download_wasm(&name, &full_name).await {
-                        Ok(bytes) => {
-                            if let Err(e) =
-                                tokio::fs::write(wasm_path, &bytes).await
-                            {
-                                eprintln!(
-                                    "Error while creating file for {}: {}",
-                                    &name, e
-                                );
-                                safe_exit(1);
-                            }
-                        }
-                        Err(e) => {
-                            eprintln!("Error downloading wasm: {}", e);
-                            safe_exit(1);
-                        }
+                        safe_exit(1);
                     }
                 }
                 // if the doesn't file exist, download it.
-                Err(err) => match err.kind() {
-                    std::io::ErrorKind::NotFound => {
-                        match download_wasm(&name, &full_name).await {
-                            Ok(bytes) => {
-                                if let Err(e) =
-                                    tokio::fs::write(wasm_path, &bytes).await
-                                {
-                                    eprintln!(
-                                        "Error while creating file for {}: {}",
-                                        &name, e
-                                    );
-                                    safe_exit(1);
-                                }
-                            }
-                            Err(e) => {
-                                eprintln!("Error downloading wasm: {}", e);
-                                safe_exit(1);
-                            }
-                        }
-                    }
-                    _ => {
-                        eprintln!(
-                            "Can't read {}.",
-                            wasm_path.as_os_str().to_string_lossy()
-                        );
-                        safe_exit(1);
-                    }
-                },
+                Err(err) => {
+                    eprintln!(
+                        "Can't read {}: {}",
+                        wasm_path.as_os_str().to_string_lossy(),
+                        err
+                    );
+                    safe_exit(1);
+                }
             }
         })
     }))
@@ -270,33 +218,3 @@ pub fn read_wasm_or_exit(
         }
     }
 }
-
-async fn download_wasm(name: &str, full_name: &str) -> Result<Vec<u8>, Error> {
-    let url = wasm_url(full_name);
-
-    tracing::info!("Downloading WASM {url}...");
-
-    let response = reqwest::get(&url).await;
-
-    match response {
-        Ok(body) => {
-            let status = body.status();
-            if status.is_success() {
-                let bytes = body.bytes().await.unwrap();
-                let bytes: &[u8] = bytes.borrow();
-
-                valid_wasm_checksum(bytes, name, full_name)
-                    .map_err(Error::ChecksumMismatch)?;
-
-                let bytes: Vec<u8> = bytes.to_owned();
-
-                Ok(bytes)
-            } else if status.is_server_error() {
-                Err(Error::WasmNotFound(url))
-            } else {
-                Err(Error::ServerError(url, status.to_string()))
-            }
-        }
-        Err(e) => Err(Error::Download(url, e)),
-    }
-}

crates/node/src/lib.rs

@@ -522,8 +522,7 @@ async fn run_aux_setup(
     wasm_dir: &PathBuf,
     scheduled_migration: Option<ScheduledMigration>,
 ) -> RunAuxSetup {
-    // Prefetch needed wasm artifacts
-    wasm_loader::pre_fetch_wasm(wasm_dir).await;
+    wasm_loader::validate_wasm_artifacts(wasm_dir).await;
 
     // Find the system available memory
     let available_memory_bytes = Lazy::new(|| {

crates/tests/src/e2e/ledger_tests.rs

@@ -2143,13 +2143,7 @@ fn test_sync_chain() -> Result<()> {
     // Setup the chain
     let mut join_network = setup::run_cmd(
         Bin::Client,
-        [
-            "utils",
-            "join-network",
-            "--chain-id",
-            chain_id_raw.as_str(),
-            "--dont-prefetch-wasm",
-        ],
+        ["utils", "join-network", "--chain-id", chain_id_raw.as_str()],
         Some(60),
         &test.working_dir,
         base_dir,

crates/tests/src/e2e/setup.rs

@@ -530,7 +530,6 @@ pub fn network(
                 net.chain_id.as_str(),
                 "--genesis-validator",
                 &alias,
-                "--dont-prefetch-wasm",
             ],
             Some(5),
             &working_dir,
@@ -561,7 +560,6 @@ pub fn network(
                 "--add-persistent-peers",
                 "--chain-id",
                 net.chain_id.as_str(),
-                "--dont-prefetch-wasm",
             ],
             Some(5),
             &working_dir,

scripts/gen_localnet.py

@@ -160,7 +160,6 @@ def join_network(
         genesis_validator,
         "--pre-genesis-path",
         genesis_validator_path,
-        "--dont-prefetch-wasm",
     )
 
     info(f"Validator {genesis_validator} joined {chain_id}")