added feature assert_devices

Cargo.toml

@@ -1,13 +1,12 @@
 [package]
 name = "ctap_hmac"
 description = "A Rust implementation of the FIDO2 CTAP protocol, including the HMAC extension"
-version = "0.4.2"
+version = "0.3.0"
 license = "Apache-2.0/MIT"
-homepage = "https://github.com/shimunn/ctap"
+homepage = "https://github.com/ArdaXi/ctap/pull/2"
 repository = "https://github.com/shimunn/ctap"
 authors = ["Arda Xi <arda@ardaxi.com>", "shimun <shimun@shimun.net>"]
 edition = "2018"
-readme = "README.md"
 
 [dependencies]
 rand = "0.6"
@@ -28,4 +27,4 @@ crossbeam = "0.7.3"
 hex = "0.4.0"
 
 [features]
-request_multiple = ["crossbeam"]
+assert_devices = ["crossbeam"]

examples/hmac.rs

@@ -2,8 +2,8 @@ extern crate ctap_hmac as ctap;
 
 use crypto::digest::Digest;
 use crypto::sha2::Sha256;
-use ctap::extensions::{self, FidoExtensionResponseParserExt};
+use ctap::extensions::hmac::HmacExtension;
-use ctap::{FidoAssertionRequestBuilder, FidoCredential, FidoCredentialRequestBuilder};
+use ctap::{FidoCredential, FidoCredentialRequestBuilder, AuthenticatorOptions};
 use hex;
 use std::env::args;
 use std::io::prelude::*;
@@ -16,37 +16,24 @@ fn main() -> ctap::FidoResult<()> {
     let mut devices = ctap::get_devices()?;
     let device_info = &mut devices.next().expect("No authenticator found");
     let mut device = ctap::FidoDevice::new(device_info)?;
-    let credential = match args().nth(1).map(|h| FidoCredential {
+
+    let mut credential = match args().skip(1).next().map(|h| FidoCredential {
         id: hex::decode(&h).expect("Invalid credential"),
         public_key: None,
     }) {
         Some(cred) => cred,
         _ => {
-            let mut req = FidoCredentialRequestBuilder::default()
+            let req = FidoCredentialRequestBuilder::default().rp_id(RP_ID).rp_name("ctap_hmac crate").user_name("example").uv(false).build().unwrap();
-                .rp_id(RP_ID)
-                .rp_name("ctap_hmac crate")
-                .user_name("example")
-                .uv(false)
-                .build()
-                .unwrap();
 
-            assert!(
-                &device.supports_extension::<extensions::HmacSecret>(),
-                "Your device does not support the hmac extension"
-            );
-            let hmac = extensions::HmacSecret::new();
-            req.with_extension(&hmac)?;
-            dbg!(&req);
             println!("Authorize using your device");
-            let cred = req
+            let cred = device.make_hmac_credential(req).expect("Failed to request credential");
-                .make_credential(&mut device)
-                .expect("Failed to request credential");
             println!("Credential: {}\nNote: You can pass this credential as first argument in order to reproduce results", hex::encode(&cred.id));
             cred
         }
     };
+    let credential = credential;
     print!("Type in your message: ");
-    stdout().flush().unwrap();
+    stdout().flush();
     let mut message = String::new();
     stdin()
         .read_line(&mut message)
@@ -57,16 +44,7 @@ fn main() -> ctap::FidoResult<()> {
     let mut digest = Sha256::new();
     digest.input(&message.as_bytes());
     digest.result(&mut salt);
-    let credential = &&credential;
+    let (cred, (hash1, _hash2)) = device.get_hmac_assertion(RP_ID, &[&credential], &salt, None, None)?;
-    let hmac = extensions::HmacSecret::new().for_device(&mut device, &salt, None)?;
-    let mut request = FidoAssertionRequestBuilder::default()
-        .rp_id(RP_ID)
-        .credential(credential)
-        .build()
-        .unwrap();
-    request.with_extension(&hmac)?;
-    let (_cred, auth_data) = device.get_assertion(&request)?;
-    let (hash1, _hash2) = auth_data.parse_extension_data(&hmac)?;
     println!("Hash: {}", hex::encode(&hash1));
     Ok(())
 }

examples/multiple.rs

@@ -1,16 +1,24 @@
 extern crate ctap_hmac as ctap;
+
+use crossbeam::thread;
+use crypto::digest::Digest;
+use crypto::sha2::Sha256;
 use ctap::{
     FidoAssertionRequestBuilder, FidoCredential, FidoCredentialRequestBuilder, FidoDevice,
-    FidoResult,
+    FidoError, FidoResult,
 };
-
+use failure::_core::time::Duration;
 use hex;
 use std::env::args;
-use std::time::Duration;
+use std::io::prelude::*;
+use std::io::stdin;
+use std::io::stdout;
+use std::sync::mpsc::channel;
+use std::sync::Mutex;
 
 const RP_ID: &str = "ctap_demo";
 
-fn main() -> ctap::FidoResult<()> {
+fn run() -> ctap::FidoResult<()> {
     let mut credentials = args()
         .skip(1)
         .map(|id| FidoCredential {
@@ -40,9 +48,11 @@ fn main() -> ctap::FidoResult<()> {
     let mut devices = ctap::get_devices()?
         .map(|handle| FidoDevice::new(&handle))
         .collect::<FidoResult<Vec<_>>>()?;
-    // run with --features request_multiple
+    let (cred, _) = ctap::get_assertion_devices(&req, devices.iter_mut())?;
-    let (cred, _) =
-        ctap::get_assertion_devices(&req, devices.iter_mut(), Some(Duration::from_secs(10)))?;
     println!("Success, got assertion for: {}", hex::encode(&cred.id));
     Ok(())
 }
+
+fn main() {
+    dbg!(run());
+}

src/cbor.rs

@@ -274,12 +274,6 @@ pub struct GetInfoResponse {
     pub options: OptionsInfo,
     pub max_msg_size: u16,
     pub pin_protocols: Vec<u8>,
-    pub max_credential_count_in_list: Option<u32>,
-    pub max_credential_id_len: Option<u32>,
-    pub transports: Vec<String>,
-    pub algorithms: Vec<CoseKey>,
-    pub max_authenticator_config_len: Option<u32>,
-    pub default_cred_protect: Option<u8>,
 }
 
 impl GetInfoResponse {
@@ -288,49 +282,28 @@ impl GetInfoResponse {
         if status != 0 {
             Err(FidoErrorKind::CborError(CborErrorCode::from(status)))?
         }
-        let mut generic = GenericDecoder::new(Config::default(), reader);
+        let mut decoder = Decoder::new(Config::default(), reader);
         let mut response = GetInfoResponse::default();
-        for _ in 0..generic.borrow_mut().object()? {
+        for _ in 0..decoder.object()? {
-            match generic.borrow_mut().u8()? {
+            match decoder.u8()? {
                 0x01 => {
-                    let decoder = generic.borrow_mut();
                     for _ in 0..decoder.array()? {
                         response.versions.push(decoder.text()?);
                     }
                 }
                 0x02 => {
-                    let decoder = generic.borrow_mut();
                     for _ in 0..decoder.array()? {
                         response.extensions.push(decoder.text()?);
                     }
                 }
-                0x03 => response
+                0x03 => response.aaguid.copy_from_slice(&decoder.bytes()?[..]),
-                    .aaguid
+                0x04 => response.options = OptionsInfo::decode(&mut decoder)?,
-                    .copy_from_slice(&generic.borrow_mut().bytes()?[..]),
+                0x05 => response.max_msg_size = decoder.u16()?,
-                0x04 => response.options = OptionsInfo::decode(&mut generic.borrow_mut())?,
-                0x05 => response.max_msg_size = generic.borrow_mut().u16()?,
                 0x06 => {
-                    let decoder = generic.borrow_mut();
                     for _ in 0..decoder.array()? {
                         response.pin_protocols.push(decoder.u8()?);
                     }
                 }
-                0x07 => response.max_credential_count_in_list = Some(generic.borrow_mut().u32()?),
-                0x08 => response.max_credential_id_len = Some(generic.borrow_mut().u32()?),
-                0x09 => {
-                    let decoder = generic.borrow_mut();
-                    for _ in 0..decoder.array()? {
-                        response.transports.push(decoder.text()?);
-                    }
-                }
-                0x0A => {
-                    for _ in 0..generic.borrow_mut().array()? {
-                        response.algorithms.push(CoseKey::decode(&mut generic)?);
-                    }
-                }
-                0x0B => response.max_authenticator_config_len = Some(generic.borrow_mut().u32()?),
-
-                0x0C => response.default_cred_protect = Some(generic.borrow_mut().u8()?),
                 _ => continue,
             }
         }
@@ -450,9 +423,7 @@ impl OptionsInfo {
                 "clientPin" => options.client_pin = Some(decoder.bool()?),
                 "up" => options.up = decoder.bool()?,
                 "uv" => options.uv = Some(decoder.bool()?),
-                _ => {
+                _ => continue,
-                    decoder.bool()?;
-                }
             }
         }
         Ok(options)
@@ -592,7 +563,7 @@ impl P256Key {
     }
 }
 
-#[derive(Debug, Default, Clone)]
+#[derive(Debug, Default)]
 pub struct CoseKey {
     key_type: u16,
     algorithm: i32,

src/crypto.rs

@@ -15,7 +15,7 @@ use rust_crypto::buffer::{RefReadBuffer, RefWriteBuffer};
 use rust_crypto::symmetriccipher::{Decryptor, Encryptor};
 use untrusted::Input;
 
-#[derive(Debug, Clone)]
+#[derive(Debug)]
 pub struct SharedSecret {
     pub public_key: CoseKey,
     pub shared_secret: [u8; 32],

src/error.rs

@@ -23,8 +23,6 @@ pub struct CborErrorCode(u8);
 pub enum FidoErrorKind {
     #[fail(display = "Read/write error with device.")]
     Io,
-    #[fail(display = "Operation timed out")]
-    Timeout,
     #[fail(display = "Error while reading packet from device.")]
     ReadPacket,
     #[fail(display = "Error while writing packet to device.")]
@@ -49,7 +47,7 @@ pub enum FidoErrorKind {
     DecryptPin,
     #[fail(display = "Failed to verify response signature.")]
     VerifySignature,
-    #[fail(display = "Failed to verify response signature.")]
+    #[fail(display = "Supplied key has incorrect type.")]
     KeyType,
     #[fail(display = "Device returned error: {}", _0)]
     CborError(CborErrorCode),

src/extensions/cred_protect.rs

@@ -1,57 +0,0 @@
-use crate::extensions::FidoExtension;
-use crate::FidoResult;
-use crate::{FidoAssertionRequest, FidoCredentialRequest};
-use cbor_codec::value::Value;
-use num_traits::ToPrimitive;
-
-#[derive(Copy, Clone, Debug, FromPrimitive, ToPrimitive, PartialEq)]
-pub enum CredProtectLevel {
-    UvOptional = 0x01,
-    UvOptionalWithCredentialIDList = 0x02,
-    UvRequired = 0x03,
-}
-
-impl CredProtectLevel {
-    fn extension_input(self) -> Value {
-        Value::U8(self.to_u8().unwrap())
-    }
-}
-
-pub struct CredProtect(Value);
-
-impl CredProtect {
-    pub fn level(level: CredProtectLevel) -> Self {
-        Self(level.extension_input())
-    }
-
-    fn extension_name() -> &'static str {
-        "credProtect"
-    }
-
-    fn extension_input(&self) -> &Value {
-        &self.0
-    }
-}
-
-impl FidoExtension for CredProtect {
-    fn extension_name() -> &'static str {
-        CredProtect::extension_name()
-    }
-
-    fn patch_assertion_request<'a, 'b>(
-        &'b self,
-        _request: &mut FidoAssertionRequest<'a, 'b>,
-    ) -> FidoResult<()> {
-        Ok(())
-    }
-
-    fn patch_credential_request<'a>(
-        &'a self,
-        request: &mut FidoCredentialRequest<'a>,
-    ) -> FidoResult<()> {
-        request
-            .extension_data
-            .insert(CredProtect::extension_name(), self.extension_input());
-        Ok(())
-    }
-}

src/extensions/hmac.rs

@@ -1,14 +1,11 @@
-use crate::cbor::AuthenticatorData;
+use crate::{
-use crate::crypto::SharedSecret;
+    AuthenticatorOptions, FidoAssertionRequestBuilder,
-use crate::extensions::{
+    FidoCredentialRequest,
-    FidoExtension, FidoExtensionResponseParser, FidoExtensionResponseParserExt,
 };
-use crate::{FidoAssertionRequest, FidoAssertionRequestBuilder, FidoCredentialRequest};
 use crate::{FidoCredential, FidoDevice, FidoErrorKind, FidoResult};
 use cbor_codec::value::{Bytes, Int, Key, Text, Value};
 use cbor_codec::Encoder;
 use cbor_codec::{Config, GenericDecoder};
-use failure::ResultExt;
 use rust_crypto::buffer::{RefReadBuffer, RefWriteBuffer};
 use rust_crypto::digest::Digest;
 use rust_crypto::hmac::Hmac;
@@ -16,11 +13,8 @@ use rust_crypto::mac::Mac;
 use rust_crypto::sha2::Sha256;
 use std::collections::BTreeMap;
 use std::io::Cursor;
+use std::iter::FromIterator;
 
-#[deprecated(
-    since = "0.4.2",
-    note = "Please use FidoAssertionRequest::with_extension(HmacSecret) instead"
-)]
 pub trait HmacExtension {
     fn extension_name() -> &'static str {
         "hmac-secret"
@@ -46,10 +40,8 @@ pub trait HmacExtension {
 
     /// Convenience function to create an credential which includes extension specific data
     /// Use `FidoDevice::make_credential` if you need more control
-    fn make_hmac_credential(
+    fn make_hmac_credential(&mut self, request: FidoCredentialRequest) -> FidoResult<FidoCredential>;
-        &mut self,
+
-        request: &FidoCredentialRequest,
-    ) -> FidoResult<FidoCredential>;
 
     /// Request an assertion from the authenticator for a given credential and salt(s).
     /// at least one `salt` must be provided, consider using a hashing function like SHA256
@@ -61,11 +53,13 @@ pub trait HmacExtension {
     /// provided, and will fail if a PIN is required but not provided or if the
     /// device returns malformed data.
     ///
-    fn get_hmac_assertion<'a: 'b, 'b>(
+    fn get_hmac_assertion<'a>(
         &mut self,
-        assertion: &FidoAssertionRequest<'a, 'b>,
+        rp_id: &str,
+        credentials: &'a [&'a FidoCredential],
         salt: &[u8; 32],
         salt2: Option<&[u8; 32]>,
+        options: Option<AuthenticatorOptions>,
     ) -> FidoResult<(&'a FidoCredential, ([u8; 32], Option<[u8; 32]>))>;
 
     /// Convenience function for `get_hmac_assertion` that will accept arbitrary
@@ -81,87 +75,19 @@ pub trait HmacExtension {
         digest.input(input);
         digest.result(&mut salt);
         self.get_hmac_assertion(
-            &FidoAssertionRequestBuilder::default()
+            rp_id,
-                .rp_id(rp_id)
+            &[credential],
-                .credential(&credential)
-                .build()
-                .unwrap(),
             &salt,
             None,
+            Some(AuthenticatorOptions { uv: true, rk: true, up: false }),
         )
         .map(|(_cred, secret)| secret.0)
     }
 }
 
-#[allow(deprecated)]
 impl HmacExtension for FidoDevice {
     fn get_data(&mut self, salt: &[u8; 32], salt2: Option<&[u8; 32]>) -> FidoResult<Value> {
-        Ok(HmacSecret::extension_input(self, salt, salt2)?)
+        let shared_secret = self.shared_secret.as_ref().unwrap();
-    }
-
-    fn make_hmac_credential(
-        &mut self,
-        request: &FidoCredentialRequest,
-    ) -> FidoResult<FidoCredential> {
-        let mut request = request.clone();
-        request.rk = true;
-        request.extension_data.insert(
-            <Self as HmacExtension>::extension_name(),
-            <Self as HmacExtension>::extension_input(),
-        );
-        self.make_credential(&request)
-    }
-
-    fn get_hmac_assertion<'a: 'b, 'b>(
-        &mut self,
-        request: &FidoAssertionRequest<'a, 'b>,
-        salt: &[u8; 32],
-        salt2: Option<&[u8; 32]>,
-    ) -> FidoResult<(&'a FidoCredential, ([u8; 32], Option<[u8; 32]>))> {
-        while self.shared_secret.is_none() {
-            self.init_shared_secret()?;
-        }
-        let mut request = request.clone();
-        let ext = HmacSecret::new().for_device(self, salt, salt2)?;
-        request.with_extension(&ext)?;
-
-        let (cred, auth_data) = self.get_assertion(&request)?;
-
-        let cred = request
-            .credentials
-            .iter()
-            .find(|c| c.id == cred.id)
-            .unwrap();
-        Ok((cred, auth_data.parse_extension_data(&ext)?))
-    }
-}
-
-#[derive(Debug, Clone)]
-pub enum HmacSecret {
-    Assertion {
-        extension_data: Value,
-        shared_secret: SharedSecret,
-        salt2: bool,
-    },
-    Credential,
-}
-
-impl HmacSecret {
-    pub fn new() -> Self {
-        Self::Credential
-    }
-
-    fn extension_input(
-        device: &mut FidoDevice,
-        salt: &[u8; 32],
-        salt2: Option<&[u8; 32]>,
-    ) -> FidoResult<Value> {
-        let shared_secret = loop {
-            if let Some(ref secret) = device.shared_secret {
-                break secret;
-            }
-            device.init_shared_secret()?;
-        };
         let mut encryptor = shared_secret.encryptor();
         let mut salt_enc = [0u8; 64];
         let mut output = RefWriteBuffer::new(&mut salt_enc);
@@ -189,7 +115,7 @@ impl HmacSecret {
         let mut map = BTreeMap::new();
         map.insert(
             Key::Int(Int::from_i64(0x01)),
-            key_agreement().context(FidoErrorKind::Io)?,
+            key_agreement().map_err(|_| FidoErrorKind::Io)?,
         );
         map.insert(
             Key::Int(Int::from_i64(0x02)),
@@ -212,67 +138,50 @@ impl HmacSecret {
         Ok(Value::Map(map))
     }
 
-    pub fn for_device(
+    fn make_hmac_credential(&mut self, request: FidoCredentialRequest) -> FidoResult<FidoCredential> {
+        let mut request = request;
+        request.rk = true;
+        request.extension_data.insert(<Self as HmacExtension>::extension_name(), <Self as HmacExtension>::extension_input());
+        self.make_credential(&request)
+    }
+
+    fn get_hmac_assertion<'a>(
         &mut self,
-        device: &mut FidoDevice,
+        rp_id: &str,
+        credentials: &'a [&'a FidoCredential],
         salt: &[u8; 32],
         salt2: Option<&[u8; 32]>,
-    ) -> FidoResult<Self> {
+        options: Option<AuthenticatorOptions>,
-        Ok(Self::Assertion {
+    ) -> FidoResult<(&'a FidoCredential, ([u8; 32], Option<[u8; 32]>))> {
-            extension_data: Self::extension_input(device, salt, salt2)?,
+        while self.shared_secret.is_none() {
-            shared_secret: device.shared_secret.as_ref().unwrap().clone(),
+            self.init_shared_secret()?;
-            salt2: salt2.is_some(),
-        })
         }
-}
+        let ext_data: Value = self.get_data(salt, salt2)?;
 
-impl FidoExtension for HmacSecret {
+        let ext_data: BTreeMap<&str, &Value> = BTreeMap::from_iter(
-    fn extension_name() -> &'static str {
+            [(<Self as HmacExtension>::extension_name(), &ext_data)]
-        "hmac-secret"
+                .iter()
+                .cloned(),
+        );
+
+        let mut builder = FidoAssertionRequestBuilder::default()
+            .credentials(credentials)
+            .rp_id(rp_id)
+            .extension_data(ext_data);
+
+        if let Some(opts) = options {
+            builder = builder.uv(opts.uv).up(opts.up);
         }
 
-    fn patch_assertion_request<'a, 'b>(
+        let (cred, auth_data) =
-        &'b self,
+            self.get_assertion(&builder.build().unwrap())?;
-        request: &mut FidoAssertionRequest<'a, 'b>,
+        let shared_secret = self.shared_secret.as_ref().unwrap();
-    ) -> FidoResult<()> {
-        match self {
-            Self::Assertion { extension_data, .. } => request
-                .extension_data
-                .insert(Self::extension_name(), extension_data),
-            _ => return Err(FidoErrorKind::DeviceUnsupported.into()),
-        };
-        Ok(())
-    }
-
-    fn patch_credential_request<'a>(
-        &'a self,
-        request: &mut FidoCredentialRequest<'a>,
-    ) -> FidoResult<()> {
-        request
-            .extension_data
-            .insert(Self::extension_name(), &Value::Bool(true));
-        Ok(())
-    }
-}
-
-impl FidoExtensionResponseParser for HmacSecret {
-    type Output = ([u8; 32], Option<[u8; 32]>);
-
-    fn parse_response(&self, response: &AuthenticatorData) -> FidoResult<Self::Output> {
-        let (shared_secret, salt2) = match self {
-            Self::Assertion {
-                shared_secret,
-                salt2,
-                ..
-            } => (shared_secret, salt2),
-            _ => return Err(FidoErrorKind::DeviceUnsupported.into()),
-        };
         let mut decryptor = shared_secret.decryptor();
         let mut hmac_secret_combined = [0u8; 64];
         let _output = RefWriteBuffer::new(&mut hmac_secret_combined);
-        let hmac_secret_enc = match response
+        let hmac_secret_enc = match auth_data
             .extensions
-            .get(Self::extension_name())
+            .get(<Self as HmacExtension>::extension_name())
             .ok_or(FidoErrorKind::CborDecode)?
         {
             Value::Bytes(hmac_ciphered) => Ok(match hmac_ciphered {
@@ -297,6 +206,7 @@ impl FidoExtensionResponseParser for HmacSecret {
         let mut hmac_secret_1 = [0u8; 32];
         hmac_secret_0.copy_from_slice(&hmac_secret[0..32]);
         hmac_secret_1.copy_from_slice(&hmac_secret[32..]);
-        Ok((hmac_secret_0, Some(hmac_secret_1).filter(|_| *salt2)))
+        let cred = credentials.into_iter().find(|c| c.id == cred.id).unwrap();
+        Ok((cred, (hmac_secret_0, salt2.and(Some(hmac_secret_1)))))
     }
 }

src/extensions/mod.rs

@@ -1,36 +1,2 @@
 pub mod hmac;
 pub use hmac::*;
-mod cred_protect;
-use crate::cbor::AuthenticatorData;
-use crate::{FidoAssertionRequest, FidoCredentialRequest, FidoResult};
-pub use cred_protect::*;
-
-pub trait FidoExtension {
-    fn extension_name() -> &'static str;
-    fn patch_assertion_request<'a, 'b>(
-        &'b self,
-        request: &mut FidoAssertionRequest<'a, 'b>,
-    ) -> FidoResult<()>;
-    fn patch_credential_request<'a>(
-        &'a self,
-        request: &mut FidoCredentialRequest<'a>,
-    ) -> FidoResult<()>;
-}
-
-pub trait FidoExtensionResponseParser {
-    type Output;
-    fn parse_response(&self, response: &AuthenticatorData) -> FidoResult<Self::Output>;
-}
-
-pub trait FidoExtensionResponseParserExt<Ext: FidoExtensionResponseParser> {
-    fn parse_extension_data(&self, extension: &Ext) -> FidoResult<Ext::Output>;
-}
-
-impl<Ext: FidoExtensionResponseParser> FidoExtensionResponseParserExt<Ext> for AuthenticatorData {
-    fn parse_extension_data(
-        &self,
-        extension: &Ext,
-    ) -> FidoResult<<Ext as FidoExtensionResponseParser>::Output> {
-        extension.parse_response(self)
-    }
-}

src/lib.rs

@@ -74,9 +74,7 @@ pub use self::error::*;
 use self::hid_linux as hid;
 use self::packet::CtapCommand;
 pub use self::util::*;
-use crate::cbor::{AuthenticatorData, GetAssertionRequest, GetInfoResponse};
+use crate::cbor::{AuthenticatorData, GetAssertionRequest};
-use crate::packet::CtapStatus;
-use crate::extensions::FidoExtension;
 use failure::{Fail, ResultExt};
 use num_traits::FromPrimitive;
 use rand::prelude::*;
@@ -109,7 +107,6 @@ pub struct FidoDevice {
     shared_secret: Option<crypto::SharedSecret>,
     pin_token: Option<crypto::PinToken>,
     aaguid: [u8; 16],
-    info: GetInfoResponse,
 }
 
 pub struct FidoCancelHandle {
@@ -120,7 +117,7 @@ pub struct FidoCancelHandle {
 
 impl FidoCancelHandle {
     pub fn cancel(&mut self) -> FidoResult<()> {
-        let payload = &[];
+        let payload = &[1u8];
         let to_send = payload.len() as u16;
         let max_payload = (self.packet_size - 7) as usize;
         let (frame, payload) = payload.split_at(cmp::min(payload.len(), max_payload));
@@ -207,10 +204,6 @@ impl<'a> FidoCredentialRequest<'a> {
     pub fn make_credential(&self, device: &mut FidoDevice) -> FidoResult<FidoCredential> {
         device.make_credential(&self)
     }
-
-    pub fn with_extension<Ext: FidoExtension>(&mut self, extension: &'a Ext) -> FidoResult<()> {
-        extension.patch_credential_request(self)
-    }
 }
 
 /// Request an assertion from the authenticator for a given credential.
@@ -224,7 +217,7 @@ impl<'a> FidoCredentialRequest<'a> {
 #[derive(Clone, Debug, Builder)]
 #[builder(setter(into))]
 #[builder(pattern = "owned")]
-pub struct FidoAssertionRequest<'a, 'b> {
+pub struct FidoAssertionRequest<'a> {
     #[builder(default)]
     up: bool,
     #[builder(default)]
@@ -239,20 +232,16 @@ pub struct FidoAssertionRequest<'a, 'b> {
     #[builder(default = "&[0u8; 32]")]
     client_data_hash: &'a [u8],
     #[builder(default)]
-    extension_data: BTreeMap<&'b str, &'b cbor_codec::value::Value>,
+    extension_data: BTreeMap<&'a str, &'a cbor_codec::value::Value>,
 }
 
-impl<'a, 'b> FidoAssertionRequest<'a, 'b> {
+impl<'a> FidoAssertionRequest<'a> {
     pub fn get_assertion(&self, device: &mut FidoDevice) -> FidoResult<&'a FidoCredential> {
         device.get_assertion(self).map(|res| res.0)
     }
-
-    pub fn with_extension<Ext: FidoExtension>(&mut self, extension: &'b Ext) -> FidoResult<()> {
-        extension.patch_assertion_request(self)
-    }
 }
 
-impl<'a, 'b> FidoAssertionRequestBuilder<'a, 'b> {
+impl<'a> FidoAssertionRequestBuilder<'a> {
     pub fn credential(mut self, credential: &'a &'a FidoCredential) -> Self {
         self.credentials = Some(std::slice::from_ref(credential));
         self
@@ -277,7 +266,6 @@ impl FidoDevice {
             shared_secret: None,
             pin_token: None,
             aaguid: [0; 16],
-            info: GetInfoResponse::default(),
         };
         dev.init()?;
         Ok(dev)
@@ -312,7 +300,6 @@ impl FidoDevice {
         }
         self.needs_pin = response.options.client_pin == Some(true);
         self.aaguid = response.aaguid;
-        self.info = response;
         Ok(())
     }
 
@@ -382,10 +369,6 @@ impl FidoDevice {
             .context(FidoErrorKind::Io)?)
     }
 
-    pub fn supports_extension<Ext: FidoExtension>(&self) -> bool {
-        self.info.extensions.iter().any(|ext| ext == Ext::extension_name())
-    }
-
     pub fn make_credential(
         &mut self,
         request: &FidoCredentialRequest<'_>,
@@ -474,9 +457,10 @@ impl FidoDevice {
     ///
     /// This method will fail if a PIN is required but the device is not
     /// unlocked or if the device returns malformed data.
-    pub fn get_assertion<'a, 'b>(
+
+    pub fn get_assertion<'a>(
         &mut self,
-        assertion: &FidoAssertionRequest<'a, 'b>,
+        assertion: &FidoAssertionRequest<'a>,
     ) -> FidoResult<(&'a FidoCredential, AuthenticatorData)> {
         while self.shared_secret.is_none() {
             self.init_shared_secret()?;
@@ -555,26 +539,6 @@ impl FidoDevice {
             .map(|cred| (cred, response.auth_data))
     }
 
-    pub fn ping(&mut self, data: &[u8]) -> FidoResult<Vec<u8>> {
-        self.exchange(CtapCommand::Ping, data)
-    }
-
-    pub fn wink(&mut self) -> FidoResult<()> {
-        self.send(&CtapCommand::Wink, &[]).map(|_| ())
-    }
-
-    fn lock(&mut self, time_sec: u8) -> FidoResult<()> {
-        self.exchange(CtapCommand::Lock, &[time_sec]).map(|_| ())
-    }
-
-    fn keepalive(&mut self) -> FidoResult<CtapStatus> {
-        self.exchange(CtapCommand::Keepalive, &[])?
-            .first()
-            .cloned()
-            .and_then(CtapStatus::from_u8)
-            .ok_or(FidoError::from(FidoErrorKind::CborDecode))
-    }
-
     fn cbor(&mut self, request: cbor::Request) -> FidoResult<cbor::Response> {
         let mut buf = Cursor::new(Vec::new());
         request
@@ -593,7 +557,7 @@ impl FidoDevice {
     }
 
     fn send(&mut self, cmd: &CtapCommand, payload: &[u8]) -> FidoResult<()> {
-        if payload.len() > u16::MAX as usize {
+        if payload.is_empty() || payload.len() > u16::MAX as usize {
             Err(FidoErrorKind::WritePacket)?
         }
         let to_send = payload.len() as u16;

src/packet.rs

@@ -13,7 +13,7 @@ use std::io::{Read, Write};
 static FRAME_INIT: u8 = 0x80;
 
 #[repr(u8)]
-#[derive(Debug, FromPrimitive, ToPrimitive, PartialEq)]
+#[derive(FromPrimitive, ToPrimitive, PartialEq)]
 pub enum CtapCommand {
     Invalid = 0x00,
     Ping = 0x01,
@@ -36,13 +36,6 @@ impl CtapCommand {
     }
 }
 
-#[repr(u8)]
-#[derive(Debug, FromPrimitive, ToPrimitive, PartialEq)]
-pub enum CtapStatus {
-    Processing = 0x01,
-    AwaitingUserPresence = 0x02,
-}
-
 #[repr(u8)]
 #[derive(FromPrimitive, Fail, Debug)]
 pub enum CtapError {

src/util.rs

@@ -1,88 +1,44 @@
-#[cfg(feature = "request_multiple")]
+use crate::cbor::AuthenticatorData;
-use crate::{
+use crate::{FidoAssertionRequest, FidoCredential, FidoDevice, FidoErrorKind, FidoResult};
-    cbor::AuthenticatorData, FidoAssertionRequest, FidoCredential, FidoCredentialRequest,
-    FidoDevice, FidoErrorKind, FidoResult,
-};
-#[cfg(feature = "request_multiple")]
-use crossbeam::thread;
-#[cfg(feature = "request_multiple")]
 use std::sync::mpsc::channel;
-#[cfg(feature = "request_multiple")]
+#[cfg(feature = "assert_devices")]
-use std::time::Duration;
+use crossbeam::thread;
-#[cfg(feature = "request_multiple")]
+
-pub fn request_multiple_devices<
+/// Will send the `assertion` to all supplied `devices` and return either the first successful assertion or the last error
-    'a,
+#[cfg(feature = "assert_devices")]
-    T: Send + 'a,
+pub fn get_assertion_devices<'a>(
-    F: Fn(&mut FidoDevice) -> FidoResult<T> + 'a + Sync,
+    assertion: &'a FidoAssertionRequest,
->(
+    devices: impl Iterator<Item = &'a mut FidoDevice>,
-    devices: impl Iterator<Item = (&'a mut FidoDevice, &'a F)>,
+) -> FidoResult<(&'a FidoCredential, AuthenticatorData)> {
-    timeout: Option<Duration>,
+    thread::scope(
-) -> FidoResult<T> {
+        |scope| -> FidoResult<(&'a FidoCredential, AuthenticatorData)> {
-    thread::scope(|scope| -> FidoResult<T> {
             let (tx, rx) = channel();
             let handles = devices
-            .map(|(device, fn_)| {
+                .map(|device| {
                     let cancel = device.cancel_handle()?;
                     let tx = tx.clone();
-                let thread_handle = scope.spawn(move |_| tx.send(fn_(device)));
+                    let thread_handle =
+                        scope.spawn(move |_| tx.send(device.get_assertion(assertion)));
                     Ok((cancel, thread_handle))
                 })
                 .collect::<FidoResult<Vec<_>>>()?;
+
             let mut err = None;
-        let mut slept = Duration::from_millis(0);
+            for res in rx.iter().take(handles.len()) {
-        let interval = Duration::from_millis(10);
+                match res {
-        let mut received = 0usize;
+                    Ok(_) => {
-        let res = loop {
-            match timeout {
-                Some(t) if t < slept => {
-                    break if let Some(cause) = err {
-                        cause
-                    } else {
-                        Err(FidoErrorKind::Timeout.into())
-                    };
-                }
-                _ => (),
-            }
-            if timeout.map(|t| t < slept).unwrap_or(true) {}
-            if let Ok(msg) = rx.recv_timeout(interval) {
-                received += 1;
-                match msg {
-                    e @ Err(_) if received == handles.len() => break e,
-                    e @ Err(_) => err = Some(e),
-                    res @ Ok(_) => break res,
-                }
-            } else {
-                slept += interval;
-            }
-        };
                         for (mut cancel, join) in handles {
                             // Canceling out of courtesy don't care if it fails
                             let _ = cancel.cancel();
                             let _ = join.join();
                         }
-        res
+                        return res;
-    })
+                    }
+                    e => err = Some(e),
+                }
+            }
+            err.unwrap_or(Err(FidoErrorKind::DeviceUnsupported.into()))
+        },
+    )
     .unwrap()
 }
-
-/// Will send the `assertion_request` to all supplied `devices` and return either the first successful assertion or the last error
-#[cfg(feature = "request_multiple")]
-pub fn get_assertion_devices<'a>(
-    assertion_request: &'a FidoAssertionRequest,
-    devices: impl Iterator<Item = &'a mut FidoDevice>,
-    timeout: Option<Duration>,
-) -> FidoResult<(&'a FidoCredential, AuthenticatorData)> {
-    let get_assertion = |device: &mut FidoDevice| device.get_assertion(assertion_request);
-    request_multiple_devices(devices.map(|device| (device, &get_assertion)), timeout)
-}
-
-/// Will send the `credential_request` to all supplied `devices` and return either the first credential or the last error
-#[cfg(feature = "request_multiple")]
-pub fn make_credential_devices<'a>(
-    credential_request: &'a FidoCredentialRequest,
-    devices: impl Iterator<Item = &'a mut FidoDevice>,
-    timeout: Option<Duration>,
-) -> FidoResult<FidoCredential> {
-    let make_credential = |device: &mut FidoDevice| device.make_credential(credential_request);
-    request_multiple_devices(devices.map(|device| (device, &make_credential)), timeout)
-}