Add sturctured get assertion and client pin fuzzers (#482)

fuzz/Cargo.toml

@@ -36,12 +36,24 @@ path = "fuzz_targets/fuzz_target_process_ctap2_client_pin.rs"
 test = false
 doc = false
 
+[[bin]]
+name = "fuzz_target_process_ctap2_client_pin_structured"
+path = "fuzz_targets/fuzz_target_process_ctap2_client_pin_structured.rs"
+test = false
+doc = false
+
 [[bin]]
 name = "fuzz_target_process_ctap2_get_assertion"
 path = "fuzz_targets/fuzz_target_process_ctap2_get_assertion.rs"
 test = false
 doc = false
 
+[[bin]]
+name = "fuzz_target_process_ctap2_get_assertion_structured"
+path = "fuzz_targets/fuzz_target_process_ctap2_get_assertion_structured.rs"
+test = false
+doc = false
+
 [[bin]]
 name = "fuzz_target_process_ctap2_make_credential"
 path = "fuzz_targets/fuzz_target_process_ctap2_make_credential.rs"

fuzz/fuzz_helper/src/lib.rs

@@ -239,12 +239,12 @@ pub fn process_ctap_structured(data: &[u8], input_type: InputType) -> FuzzResult
         InputType::CborMakeCredentialParameter => Command::AuthenticatorMakeCredential(
             AuthenticatorMakeCredentialParameters::arbitrary(unstructured)?,
         ),
-        InputType::CborGetAssertionParameter => {
-            unimplemented!()
-        }
-        InputType::CborClientPinParameter => {
-            unimplemented!()
-        }
+        InputType::CborGetAssertionParameter => Command::AuthenticatorGetAssertion(
+            AuthenticatorGetAssertionParameters::arbitrary(unstructured)?,
+        ),
+        InputType::CborClientPinParameter => Command::AuthenticatorClientPin(
+            AuthenticatorClientPinParameters::arbitrary(unstructured)?,
+        ),
         InputType::Ctap1 => {
             unimplemented!()
         }

fuzz/fuzz_targets/fuzz_target_process_ctap2_client_pin_structured.rs

@@ -0,0 +1,10 @@
+#![no_main]
+
+use fuzz_helper::{process_ctap_structured, InputType};
+use libfuzzer_sys::fuzz_target;
+
+// Fuzz inputs as CTAP2 client pin command parameters.
+// The inputs will used to construct arbitrary client pin parameters.
+fuzz_target!(|data: &[u8]| {
+    process_ctap_structured(data, InputType::CborClientPinParameter).ok();
+});

fuzz/fuzz_targets/fuzz_target_process_ctap2_get_assertion_structured.rs

@@ -0,0 +1,10 @@
+#![no_main]
+
+use fuzz_helper::{process_ctap_structured, InputType};
+use libfuzzer_sys::fuzz_target;
+
+// Fuzz inputs as CTAP2 get assertion command parameters.
+// The inputs will used to construct arbitrary get assertion parameters.
+fuzz_target!(|data: &[u8]| {
+    process_ctap_structured(data, InputType::CborGetAssertionParameter).ok();
+});