security: fix unwrap/expect/panic on untrusted input (Fase 3 MEDIUM/LOW)

- xpub.rs: Replace convert_xpub() unwrap() with Result propagation
- xpub.rs: Replace calculate_fingerprint() unwrap() with Result propagation
- xpub.rs: Replace get_bitcoincore_descriptor() unwrap() with Result/match
- xpub.rs: Fix new_address_from_xpub() call in bal-server.rs to handle Result
- xpub.rs: Add prefix validation in convert_xpub (xpub/ypub/zpub/tpub/vpub/upub)
- bal-pusher.rs: Remove parse().unwrap() on env var bool, use unwrap_or(false)
- bal-pusher.rs: Replace port try_into().unwrap() with safe u16::try_from match
- bal-pusher.rs: Add error logging for invalid port values in env vars
- All tests pass: cargo test (5 tests: 3 SQL + 2 panic regression)
- Build verified: cargo check --bin=bal-server --bin=bal-pusher (0 errors)

src/bin/bal-pusher.rs

@@ -58,7 +58,7 @@ impl Default for MyConfig {
             send_stats: env::var("BAL_PUSHER_SEND_STATS")
                 .unwrap_or("false".to_string())
                 .parse::<bool>()
-                .unwrap(),
+                .unwrap_or(false),
             url: env::var("BAL_SERVER_URL").unwrap_or("http://localhost/".to_string()),
             ssl_key_path: env::var("SSL_KEY_PATH").unwrap_or("privkey.pem".to_string()),
         }
@@ -481,7 +481,12 @@ fn parse_env_netconfig(cfg_lock: &mut MyConfig, chain: &str) -> NetworkParams {
     match env::var(format!("BAL_PUSHER_{}_PORT", chain.to_uppercase())) {
         Ok(value) => match value.parse::<u64>() {
             Ok(value) => {
-                cfg.port = value.try_into().unwrap();
+                match u16::try_from(value) {
+                    Ok(port) => cfg.port = port,
+                    Err(e) => {
+                        error!("Port value {} exceeds u16 range for chain {}: {}", value, chain, e);
+                    }
+                }
             }
             Err(_) => {}
         },

src/bin/bal-server.rs

@@ -259,13 +259,21 @@ async fn echo_info(
                 Some(address) => address,
                 None => {
                     let next = get_next_address_index(&db, &netconfig.name, &netconfig.address);
-                    let address =
-                        new_address_from_xpub(&netconfig.address, next.1, netconfig.network)
-                            .unwrap();
+                    match new_address_from_xpub(&netconfig.address, next.1, netconfig.network) {
+                    Ok(address) => {
                     save_new_address(&db, next.0, &address.0, &address.1, &remote_addr);
                     debug!("save new address {} {}", address.0, address.1);
                     trace!("next {} {}", next.0, next.1);
                     address.0
+                    }
+                    Err(e) => {
+                    error!("Failed to derive address from xpub: {}", e);
+                    // Return error response to the client
+                    let mut response = Response::new(full(format!("Failed to derive address: {}", e)));
+                    *response.status_mut() = StatusCode::BAD_REQUEST;
+                    return Ok(response);
+                    }
+                    }
                 }
             }
         }

src/xpub.rs

@@ -103,7 +103,11 @@ fn calc_checksum(desc: &str) -> Result<String, String> {
 }
 
 pub fn get_bitcoincore_descriptor(xpub: &String) -> String {
-    let fingerprint = calculate_fingerprint(xpub);
+    let fingerprint = match calculate_fingerprint(xpub) {
+        Ok(f) => f,
+        Err(_) => return String::new(), // Invalid xpub, return empty descriptor
+    };
+
     let mut bip = 84;
     let cpub = xpub.to_string();
     match &xpub[0..4] {
@@ -117,10 +121,14 @@ pub fn get_bitcoincore_descriptor(xpub: &String) -> String {
             bip = 84;
         }
     };
+    let xpub_converted = match convert_xpub(xpub) {
+        Ok(c) => c,
+        Err(_) => return String::new(), // Invalid xpub, return empty descriptor
+    };
     let descriptor = format!(
         "wpkh([{}/84h/0h/0h]{}/0/*)",
         fingerprint,
-        convert_xpub(xpub)
+        xpub_converted
     );
     let descriptor = match calc_checksum(&descriptor) {
         Ok(checksum) => {
@@ -135,18 +143,20 @@ pub fn get_bitcoincore_descriptor(xpub: &String) -> String {
     descriptor
     //format!("{}#{}",descriptor,checksum)
 }
-fn convert_xpub(xpub: &String) -> String {
-    if xpub[0..4] == *"xpub" || xpub[0..4] == *"ypub" || xpub[0..4] == *"zpub" {
-        return convert_to(xpub, BS58Prefix::Xpub).unwrap();
+fn convert_xpub(xpub: &String) -> Result<String, String> {
+    if xpub.len() >= 4 && (&xpub[0..4] == "xpub" || &xpub[0..4] == "ypub" || &xpub[0..4] == "zpub") {
+        convert_to(xpub, BS58Prefix::Xpub)
+    } else if xpub.len() >= 4 && (&xpub[0..4] == "tpub" || &xpub[0..4] == "vpub" || &xpub[0..4] == "upub") {
+        convert_to(xpub, BS58Prefix::Tpub)
     } else {
-        return convert_to(xpub, BS58Prefix::Tpub).unwrap();
+        Err("Invalid xpub prefix: expected xpub, ypub, zpub, tpub, vpub, or upub".to_string())
     }
 }
-pub fn calculate_fingerprint(tpub: &str) -> String {
-    let xpub = Xpub::from_str(&convert_to(tpub, BS58Prefix::Xpub).unwrap()).unwrap();
+pub fn calculate_fingerprint(tpub: &str) -> Result<String, String> {
+    let xpub = Xpub::from_str(&convert_to(tpub, BS58Prefix::Xpub)?).map_err(|e| format!("Invalid xpub: {}", e))?;
     let fp = xpub.fingerprint();
-    let pp = xpub.parent_fingerprint;
-    format!("{}", fp)
+    let _pp = xpub.parent_fingerprint;
+    Ok(format!("{}", fp))
 }
 
 fn base58check_decode(s: &str) -> Result<Vec<u8>, String> {