Updated authenticator TOTP

- Added security check for previouse used codes
- Allow TOTP codes with 1 step back and forward when there is a time
drift. This means in total 3 codes could be valid. But only newer codes
then the previouse used codes are excepted after that.
This commit is contained in:
BlackDex 2019-10-10 17:32:20 +02:00
parent 45d9d8db94
commit ebf40099f2
12 changed files with 60 additions and 10 deletions

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@ -0,0 +1 @@
ALTER TABLE twofactor ADD COLUMN last_used INTEGER NOT NULL DEFAULT 0;

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@ -0,0 +1 @@
ALTER TABLE twofactor ADD COLUMN last_used INTEGER NOT NULL DEFAULT 0;

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@ -0,0 +1 @@
ALTER TABLE twofactor ADD COLUMN last_used INTEGER NOT NULL DEFAULT 0;

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@ -77,7 +77,7 @@ fn activate_authenticator(data: JsonUpcase<EnableAuthenticatorData>, headers: He
let twofactor = TwoFactor::new(user.uuid.clone(), type_, key.to_uppercase());
// Validate the token provided with the key
validate_totp_code(token, &twofactor.data)?;
validate_totp_code(&user.uuid, token, &twofactor.data, &conn)?;
_generate_recover_code(&mut user, &conn);
twofactor.save(&conn)?;
@ -94,27 +94,69 @@ fn activate_authenticator_put(data: JsonUpcase<EnableAuthenticatorData>, headers
activate_authenticator(data, headers, conn)
}
pub fn validate_totp_code_str(totp_code: &str, secret: &str) -> EmptyResult {
pub fn validate_totp_code_str(user_uuid: &str, totp_code: &str, secret: &str, conn: &DbConn) -> EmptyResult {
let totp_code: u64 = match totp_code.parse() {
Ok(code) => code,
_ => err!("TOTP code is not a number"),
};
validate_totp_code(totp_code, secret)
validate_totp_code(user_uuid, totp_code, secret, &conn)
}
pub fn validate_totp_code(totp_code: u64, secret: &str) -> EmptyResult {
use oath::{totp_raw_now, HashType};
pub fn validate_totp_code(user_uuid: &str, totp_code: u64, secret: &str, conn: &DbConn) -> EmptyResult {
use oath::{totp_raw_custom_time, HashType};
use std::time::{UNIX_EPOCH, SystemTime};
let decoded_secret = match BASE32.decode(secret.as_bytes()) {
Ok(s) => s,
Err(_) => err!("Invalid TOTP secret"),
};
let generated = totp_raw_now(&decoded_secret, 6, 0, 30, &HashType::SHA1);
if generated != totp_code {
err!("Invalid TOTP code");
let mut twofactor = TwoFactor::find_by_user_and_type(&user_uuid, TwoFactorType::Authenticator as i32, &conn)?;
// Get the current system time in UNIX Epoch (UTC)
let current_time: u64 = SystemTime::now().duration_since(UNIX_EPOCH)
.expect("Earlier than 1970-01-01 00:00:00 UTC").as_secs();
// First check the current time for a valid token.
let time_step_now = (current_time / 30) as i32;
let generated_now = totp_raw_custom_time(&decoded_secret, 6, 0, 30, current_time, &HashType::SHA1);
if generated_now == totp_code && time_step_now > twofactor.last_used {
twofactor.last_used = time_step_now;
twofactor.save(&conn)?;
return Ok(());
} else if generated_now == totp_code && time_step_now <= twofactor.last_used {
warn!("This or a future TOTP code has already been used!");
err!("Invalid TOTP code!");
}
Ok(())
// Check for time drifted codes
// First check the previous TOTP code
let time_step_prev = ((current_time - 30) / 30) as i32;
let generated_prev = totp_raw_custom_time(&decoded_secret, 6, 0, 30, current_time - 30, &HashType::SHA1);
if generated_prev == totp_code && time_step_prev > twofactor.last_used {
info!("TOTP Time drift detected. Token is valide for one step on the past.");
twofactor.last_used = time_step_prev;
twofactor.save(&conn)?;
return Ok(());
} else if generated_prev == totp_code && time_step_prev <= twofactor.last_used {
warn!("This or a future TOTP code has already been used!");
err!("Invalid TOTP code!");
}
// Second check the next TOTP code
let time_step_next = ((current_time + 30) / 30) as i32;
let generated_next = totp_raw_custom_time(&decoded_secret, 6, 0, 30, current_time + 30, &HashType::SHA1);
if generated_next == totp_code && time_step_next > twofactor.last_used {
info!("TOTP Time drift detected. Token is valide for one step on the future.");
twofactor.last_used = time_step_next;
twofactor.save(&conn)?;
return Ok(());
} else if generated_next == totp_code && time_step_next <= twofactor.last_used {
warn!("This or a previous TOTP code has already been used!");
err!("Invalid TOTP code!");
}
// Else no valide code received, deny access
err!("Invalid TOTP code!");
}

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@ -197,7 +197,7 @@ fn twofactor_auth(
let mut remember = data.two_factor_remember.unwrap_or(0);
match TwoFactorType::from_i32(selected_id) {
Some(TwoFactorType::Authenticator) => _tf::authenticator::validate_totp_code_str(twofactor_code, &selected_data?)?,
Some(TwoFactorType::Authenticator) => _tf::authenticator::validate_totp_code_str(user_uuid, twofactor_code, &selected_data?, conn)?,
Some(TwoFactorType::U2f) => _tf::u2f::validate_u2f_login(user_uuid, twofactor_code, conn)?,
Some(TwoFactorType::YubiKey) => _tf::yubikey::validate_yubikey_login(twofactor_code, &selected_data?)?,
Some(TwoFactorType::Duo) => _tf::duo::validate_duo_login(data.username.as_ref().unwrap(), twofactor_code, conn)?,

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@ -19,6 +19,7 @@ pub struct TwoFactor {
pub atype: i32,
pub enabled: bool,
pub data: String,
pub last_used: i32,
}
#[allow(dead_code)]
@ -47,6 +48,7 @@ impl TwoFactor {
atype: atype as i32,
enabled: true,
data,
last_used: 0,
}
}

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@ -92,6 +92,7 @@ table! {
atype -> Integer,
enabled -> Bool,
data -> Text,
last_used -> Integer,
}
}

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@ -92,6 +92,7 @@ table! {
atype -> Integer,
enabled -> Bool,
data -> Text,
last_used -> Integer,
}
}

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@ -92,6 +92,7 @@ table! {
atype -> Integer,
enabled -> Bool,
data -> Text,
last_used -> Integer,
}
}