Implement OPAQUE password provisioning on Iota
This commit is contained in:
Alex-Emmet
parent
9c3aa0cb34
commit
d23ad21f88
16 changed files with 1636 additions and 16 deletions
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@ -1,3 +1,4 @@
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pub mod password;
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mod principal_auth;
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mod session;
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336
iota-auth/src/password.rs
Normal file
336
iota-auth/src/password.rs
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@ -0,0 +1,336 @@
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use mtp::crypto::PublicKeyBundle;
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use opaque_ke::{
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CipherSuite, CredentialFinalization, CredentialRequest, Identifiers, RegistrationRequest,
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RegistrationUpload, Ristretto255, ServerLogin, ServerLoginParameters, ServerRegistration,
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ServerSetup, TripleDh,
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};
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use rand_core::OsRng;
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use sha2::{Digest, Sha256};
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pub struct TensaminOpaque;
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impl CipherSuite for TensaminOpaque {
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type OprfCs = Ristretto255;
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type KeyExchange = TripleDh<Ristretto255, sha2::Sha512>;
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type Ksf = argon2::Argon2<'static>;
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}
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pub type PasswordServerSetup = ServerSetup<TensaminOpaque>;
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#[derive(Debug, thiserror::Error)]
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pub enum PasswordAuthError {
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#[error("invalid OPAQUE exchange: {0}")]
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Opaque(String),
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#[error("invalid Contact public key: {0}")]
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ContactKey(String),
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#[error("OPAQUE context field is too large")]
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FieldTooLarge,
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}
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pub fn generate_server_setup() -> PasswordServerSetup {
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ServerSetup::new(&mut OsRng)
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}
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pub fn serialize_server_setup(setup: &PasswordServerSetup) -> Vec<u8> {
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setup.serialize().to_vec()
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}
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pub fn deserialize_server_setup(bytes: &[u8]) -> Result<PasswordServerSetup, PasswordAuthError> {
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ServerSetup::deserialize(bytes).map_err(|error| PasswordAuthError::Opaque(error.to_string()))
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}
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pub fn registration_start(
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setup: &PasswordServerSetup,
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request: &[u8],
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identifier: &[u8],
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) -> Result<Vec<u8>, PasswordAuthError> {
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let message = RegistrationRequest::<TensaminOpaque>::deserialize(request)
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.map_err(|error| PasswordAuthError::Opaque(error.to_string()))?;
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let result = ServerRegistration::<TensaminOpaque>::start(setup, message, identifier)
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.map_err(|error| PasswordAuthError::Opaque(error.to_string()))?;
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Ok(result.message.serialize().to_vec())
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}
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pub fn registration_finish(upload: &[u8]) -> Result<Vec<u8>, PasswordAuthError> {
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let message = RegistrationUpload::<TensaminOpaque>::deserialize(upload)
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.map_err(|error| PasswordAuthError::Opaque(error.to_string()))?;
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Ok(ServerRegistration::<TensaminOpaque>::finish(message)
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.serialize()
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.to_vec())
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}
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pub fn server_identifier(iota_id: i64) -> Vec<u8> {
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let mut result = b"tensamin:iota-password:v1\0".to_vec();
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result.extend_from_slice(&iota_id.to_be_bytes());
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result
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}
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pub fn login_context(
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principal: &str,
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iota_id: i64,
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session_id: uuid::Uuid,
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contact_key: &PublicKeyBundle,
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) -> Result<Vec<u8>, PasswordAuthError> {
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let mut result = b"tensamin:password-provisioning:v1\0".to_vec();
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let principal_len =
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u32::try_from(principal.len()).map_err(|_| PasswordAuthError::FieldTooLarge)?;
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result.extend_from_slice(&principal_len.to_be_bytes());
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result.extend_from_slice(principal.as_bytes());
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result.extend_from_slice(&iota_id.to_be_bytes());
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result.extend_from_slice(session_id.as_bytes());
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let key = contact_key
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.try_as_bytes()
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.map_err(|error| PasswordAuthError::ContactKey(error.to_string()))?;
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result.extend_from_slice(&Sha256::digest(key));
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Ok(result)
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}
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pub struct LoginStartResult {
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pub response: Vec<u8>,
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pub state: Vec<u8>,
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}
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pub fn login_start(
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setup: &PasswordServerSetup,
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record: Option<&[u8]>,
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request: &[u8],
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principal: &[u8],
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server_id: &[u8],
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context: &[u8],
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) -> Result<LoginStartResult, PasswordAuthError> {
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let message = CredentialRequest::<TensaminOpaque>::deserialize(request)
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.map_err(|error| PasswordAuthError::Opaque(error.to_string()))?;
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let registration = record
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.map(ServerRegistration::<TensaminOpaque>::deserialize)
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.transpose()
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.map_err(|error| PasswordAuthError::Opaque(error.to_string()))?;
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let result = ServerLogin::<TensaminOpaque>::start(
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&mut OsRng,
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setup,
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registration,
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message,
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principal,
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ServerLoginParameters {
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context: Some(context),
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identifiers: Identifiers {
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client: Some(principal),
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server: Some(server_id),
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},
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},
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)
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.map_err(|error| PasswordAuthError::Opaque(error.to_string()))?;
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Ok(LoginStartResult {
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response: result.message.serialize().to_vec(),
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state: result.state.serialize().to_vec(),
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})
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}
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pub fn login_finish(
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serialized_state: &[u8],
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finalization: &[u8],
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principal: &[u8],
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server_id: &[u8],
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context: &[u8],
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) -> Result<(), PasswordAuthError> {
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let state = ServerLogin::<TensaminOpaque>::deserialize(serialized_state)
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.map_err(|error| PasswordAuthError::Opaque(error.to_string()))?;
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let message = CredentialFinalization::<TensaminOpaque>::deserialize(finalization)
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.map_err(|error| PasswordAuthError::Opaque(error.to_string()))?;
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state
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.finish(
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message,
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ServerLoginParameters {
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context: Some(context),
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identifiers: Identifiers {
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client: Some(principal),
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server: Some(server_id),
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},
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},
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)
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.map_err(|error| PasswordAuthError::Opaque(error.to_string()))?;
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use mtp::crypto::Keyring;
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use opaque_ke::{
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ClientLogin, ClientLoginFinishParameters, ClientRegistration,
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ClientRegistrationFinishParameters, CredentialResponse, RegistrationResponse,
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};
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use uuid::Uuid;
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#[test]
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fn registration_and_login_bind_context_identifiers_and_persisted_setup() {
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let setup = generate_server_setup();
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let restored = deserialize_server_setup(&serialize_server_setup(&setup)).unwrap();
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let principal = b"omega-key:example#7";
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let server = server_identifier(11);
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let identifiers = Identifiers {
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client: Some(principal),
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server: Some(&server),
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};
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let registration =
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ClientRegistration::<TensaminOpaque>::start(&mut OsRng, b"correct horse").unwrap();
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let response =
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registration_start(&restored, ®istration.message.serialize(), principal).unwrap();
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let upload = registration
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.state
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.finish(
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&mut OsRng,
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b"correct horse",
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RegistrationResponse::<TensaminOpaque>::deserialize(&response).unwrap(),
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ClientRegistrationFinishParameters::new(identifiers, None),
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)
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.unwrap();
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let record = registration_finish(&upload.message.serialize()).unwrap();
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let key = Keyring::generate().public_key_bundle();
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let context = login_context("omega-key:example#7", 11, Uuid::new_v4(), &key).unwrap();
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let client = ClientLogin::<TensaminOpaque>::start(&mut OsRng, b"correct horse").unwrap();
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let result = login_start(
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&restored,
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Some(&record),
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&client.message.serialize(),
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principal,
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&server,
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&context,
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)
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.unwrap();
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let ke2 = CredentialResponse::<TensaminOpaque>::deserialize(&result.response).unwrap();
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let finish = client
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.state
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.finish(
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&mut OsRng,
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b"correct horse",
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ke2,
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ClientLoginFinishParameters::new(Some(&context), identifiers, None),
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)
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.unwrap();
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assert!(
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login_finish(
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&result.state,
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&finish.message.serialize(),
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principal,
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&server,
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&context
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)
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.is_ok()
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);
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let client = ClientLogin::<TensaminOpaque>::start(&mut OsRng, b"correct horse").unwrap();
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let mismatched = login_start(
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&restored,
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Some(&record),
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&client.message.serialize(),
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principal,
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&server,
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b"wrong context",
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)
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.unwrap();
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assert!(
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client
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.state
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.finish(
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&mut OsRng,
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b"correct horse",
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CredentialResponse::<TensaminOpaque>::deserialize(&mismatched.response)
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.unwrap(),
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ClientLoginFinishParameters::new(Some(&context), identifiers, None)
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)
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.is_err()
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);
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let wrong_server = server_identifier(12);
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for (login_principal, login_server, password) in [
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(
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b"omega-key:example#8".as_slice(),
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server.as_slice(),
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b"correct horse".as_slice(),
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),
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(
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principal.as_slice(),
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wrong_server.as_slice(),
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b"correct horse".as_slice(),
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),
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(
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principal.as_slice(),
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server.as_slice(),
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b"wrong horse".as_slice(),
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),
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] {
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let client = ClientLogin::<TensaminOpaque>::start(&mut OsRng, password).unwrap();
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let result = login_start(
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&restored,
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Some(&record),
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&client.message.serialize(),
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login_principal,
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login_server,
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&context,
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)
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.unwrap();
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assert!(
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client
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.state
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.finish(
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&mut OsRng,
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password,
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CredentialResponse::<TensaminOpaque>::deserialize(&result.response)
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.unwrap(),
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ClientLoginFinishParameters::new(Some(&context), identifiers, None)
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)
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.is_err()
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);
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}
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let client = ClientLogin::<TensaminOpaque>::start(&mut OsRng, b"correct horse").unwrap();
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let dummy = login_start(
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&restored,
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None,
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&client.message.serialize(),
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principal,
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&server,
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&context,
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)
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.unwrap();
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assert!(CredentialResponse::<TensaminOpaque>::deserialize(&dummy.response).is_ok());
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let unrelated = generate_server_setup();
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let client = ClientLogin::<TensaminOpaque>::start(&mut OsRng, b"correct horse").unwrap();
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let response = login_start(
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&unrelated,
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Some(&record),
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&client.message.serialize(),
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principal,
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&server,
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&context,
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)
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.unwrap();
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assert!(
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client
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.state
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.finish(
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&mut OsRng,
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b"correct horse",
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CredentialResponse::<TensaminOpaque>::deserialize(&response.response).unwrap(),
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ClientLoginFinishParameters::new(Some(&context), identifiers, None)
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)
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.is_err()
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);
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}
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#[test]
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fn login_context_binds_account_iota_session_and_contact_key() {
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let first = Keyring::generate().public_key_bundle();
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let second = Keyring::generate().public_key_bundle();
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let session = Uuid::new_v4();
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let original = login_context("omega-key:example#7", 11, session, &first).unwrap();
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for changed in [
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login_context("omega-key:example#8", 11, session, &first).unwrap(),
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login_context("omega-key:example#7", 12, session, &first).unwrap(),
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login_context("omega-key:example#7", 11, Uuid::new_v4(), &first).unwrap(),
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login_context("omega-key:example#7", 11, session, &second).unwrap(),
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] {
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assert_ne!(original, changed);
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}
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}
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}
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