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Remove .unwrap() in SCRAM code.

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This commit is contained in:
Emmanuel Gil Peyrot 2019-01-18 00:26:41 +01:00
parent 16b416a6d0
commit 0fddc9c717
3 changed files with 23 additions and 17 deletions
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8
sasl/src/client/mechanisms/scram.rs
View file

@ -118,8 +118,8 @@ impl<S: ScramProvider> Mechanism for Scram<S> {
client_final_message_bare.extend(b",r="); client_final_message_bare.extend(b",r=");
client_final_message_bare.extend(server_nonce.bytes()); client_final_message_bare.extend(server_nonce.bytes());
let salted_password = S::derive(&self.password, &salt, iterations)?; let salted_password = S::derive(&self.password, &salt, iterations)?;
let client_key = S::hmac(b"Client Key", &salted_password); let client_key = S::hmac(b"Client Key", &salted_password)?;
let server_key = S::hmac(b"Server Key", &salted_password); let server_key = S::hmac(b"Server Key", &salted_password)?;
let mut auth_message = Vec::new(); let mut auth_message = Vec::new();
auth_message.extend(initial_message); auth_message.extend(initial_message);
auth_message.push(b','); auth_message.push(b',');
@ -127,9 +127,9 @@ impl<S: ScramProvider> Mechanism for Scram<S> {
auth_message.push(b','); auth_message.push(b',');
auth_message.extend(&client_final_message_bare); auth_message.extend(&client_final_message_bare);
let stored_key = S::hash(&client_key); let stored_key = S::hash(&client_key);
let client_signature = S::hmac(&auth_message, &stored_key); let client_signature = S::hmac(&auth_message, &stored_key)?;
let client_proof = xor(&client_key, &client_signature); let client_proof = xor(&client_key, &client_signature);
let server_signature = S::hmac(&auth_message, &server_key); let server_signature = S::hmac(&auth_message, &server_key)?;
let mut client_final_message = Vec::new(); let mut client_final_message = Vec::new();
client_final_message.extend(&client_final_message_bare); client_final_message.extend(&client_final_message_bare);
client_final_message.extend(b",p="); client_final_message.extend(b",p=");

24
sasl/src/common/scram.rs
View file

@ -30,7 +30,7 @@ pub trait ScramProvider {
fn hash(data: &[u8]) -> Vec<u8>; fn hash(data: &[u8]) -> Vec<u8>;
/// A function which performs an HMAC using the hash function. /// A function which performs an HMAC using the hash function.
fn hmac(data: &[u8], key: &[u8]) -> Vec<u8>; fn hmac(data: &[u8], key: &[u8]) -> Result<Vec<u8>, String>;
/// A function which does PBKDF2 key derivation using the hash function. /// A function which does PBKDF2 key derivation using the hash function.
fn derive(data: &Password, salt: &[u8], iterations: usize) -> Result<Vec<u8>, String>; fn derive(data: &Password, salt: &[u8], iterations: usize) -> Result<Vec<u8>, String>;
@ -39,7 +39,7 @@ pub trait ScramProvider {
/// A `ScramProvider` which provides SCRAM-SHA-1 and SCRAM-SHA-1-PLUS /// A `ScramProvider` which provides SCRAM-SHA-1 and SCRAM-SHA-1-PLUS
pub struct Sha1; pub struct Sha1;
impl ScramProvider for Sha1 { // TODO: look at all these unwraps impl ScramProvider for Sha1 {
type Secret = secret::Pbkdf2Sha1; type Secret = secret::Pbkdf2Sha1;
fn name() -> &'static str { "SHA-1" } fn name() -> &'static str { "SHA-1" }
@ -51,14 +51,17 @@ impl ScramProvider for Sha1 { // TODO: look at all these unwraps
vec vec
} }
fn hmac(data: &[u8], key: &[u8]) -> Vec<u8> { fn hmac(data: &[u8], key: &[u8]) -> Result<Vec<u8>, String> {
type HmacSha1 = Hmac<Sha1_hash>; type HmacSha1 = Hmac<Sha1_hash>;
let mut mac = HmacSha1::new_varkey(key).unwrap(); let mut mac = match HmacSha1::new_varkey(key) {
Ok(mac) => mac,
Err(err) => return Err(format!("{}", err)),
};
mac.input(data); mac.input(data);
let result = mac.result(); let result = mac.result();
let mut vec = Vec::with_capacity(Sha1_hash::output_size()); let mut vec = Vec::with_capacity(Sha1_hash::output_size());
vec.extend_from_slice(result.code().as_slice()); vec.extend_from_slice(result.code().as_slice());
vec Ok(vec)
} }
fn derive(password: &Password, salt: &[u8], iterations: usize) -> Result<Vec<u8>, String> { fn derive(password: &Password, salt: &[u8], iterations: usize) -> Result<Vec<u8>, String> {
@ -89,7 +92,7 @@ impl ScramProvider for Sha1 { // TODO: look at all these unwraps
/// A `ScramProvider` which provides SCRAM-SHA-256 and SCRAM-SHA-256-PLUS /// A `ScramProvider` which provides SCRAM-SHA-256 and SCRAM-SHA-256-PLUS
pub struct Sha256; pub struct Sha256;
impl ScramProvider for Sha256 { // TODO: look at all these unwraps impl ScramProvider for Sha256 {
type Secret = secret::Pbkdf2Sha256; type Secret = secret::Pbkdf2Sha256;
fn name() -> &'static str { "SHA-256" } fn name() -> &'static str { "SHA-256" }
@ -101,14 +104,17 @@ impl ScramProvider for Sha256 { // TODO: look at all these unwraps
vec vec
} }
fn hmac(data: &[u8], key: &[u8]) -> Vec<u8> { fn hmac(data: &[u8], key: &[u8]) -> Result<Vec<u8>, String> {
type HmacSha256 = Hmac<Sha256_hash>; type HmacSha256 = Hmac<Sha256_hash>;
let mut mac = HmacSha256::new_varkey(key).unwrap(); let mut mac = match HmacSha256::new_varkey(key) {
Ok(mac) => mac,
Err(err) => return Err(format!("{}", err)),
};
mac.input(data); mac.input(data);
let result = mac.result(); let result = mac.result();
let mut vec = Vec::with_capacity(Sha256_hash::output_size()); let mut vec = Vec::with_capacity(Sha256_hash::output_size());
vec.extend_from_slice(result.code().as_slice()); vec.extend_from_slice(result.code().as_slice());
vec Ok(vec)
} }
fn derive(password: &Password, salt: &[u8], iterations: usize) -> Result<Vec<u8>, String> { fn derive(password: &Password, salt: &[u8], iterations: usize) -> Result<Vec<u8>, String> {

8
sasl/src/server/mechanisms/scram.rs
View file

@ -134,8 +134,8 @@ impl<S, P> Mechanism for Scram<S, P>
client_final_message_bare.extend(base64::encode(&cb_data).bytes()); client_final_message_bare.extend(base64::encode(&cb_data).bytes());
client_final_message_bare.extend(b",r="); client_final_message_bare.extend(b",r=");
client_final_message_bare.extend(server_nonce.bytes()); client_final_message_bare.extend(server_nonce.bytes());
let client_key = S::hmac(b"Client Key", &salted_password); let client_key = S::hmac(b"Client Key", &salted_password)?;
let server_key = S::hmac(b"Server Key", &salted_password); let server_key = S::hmac(b"Server Key", &salted_password)?;
let mut auth_message = Vec::new(); let mut auth_message = Vec::new();
auth_message.extend(initial_client_message); auth_message.extend(initial_client_message);
auth_message.extend(b","); auth_message.extend(b",");
@ -143,14 +143,14 @@ impl<S, P> Mechanism for Scram<S, P>
auth_message.extend(b","); auth_message.extend(b",");
auth_message.extend(client_final_message_bare.clone()); auth_message.extend(client_final_message_bare.clone());
let stored_key = S::hash(&client_key); let stored_key = S::hash(&client_key);
let client_signature = S::hmac(&auth_message, &stored_key); let client_signature = S::hmac(&auth_message, &stored_key)?;
let client_proof = xor(&client_key, &client_signature); let client_proof = xor(&client_key, &client_signature);
let sent_proof = frame.get("p").ok_or_else(|| "no proof".to_owned())?; let sent_proof = frame.get("p").ok_or_else(|| "no proof".to_owned())?;
let sent_proof = base64::decode(sent_proof).map_err(|_| "can't decode proof".to_owned())?; let sent_proof = base64::decode(sent_proof).map_err(|_| "can't decode proof".to_owned())?;
if client_proof != sent_proof { if client_proof != sent_proof {
return Err("authentication failed".to_owned()); return Err("authentication failed".to_owned());
} }
let server_signature = S::hmac(&auth_message, &server_key); let server_signature = S::hmac(&auth_message, &server_key)?;
let mut buf = Vec::new(); let mut buf = Vec::new();
buf.extend(b"v="); buf.extend(b"v=");
buf.extend(base64::encode(&server_signature).bytes()); buf.extend(base64::encode(&server_signature).bytes());