Merge branch 'duo'

src/api/core/two_factor.rs

@@ -1,4 +1,4 @@
-use data_encoding::BASE32;
+use data_encoding::{BASE32, BASE64};
 use rocket_contrib::json::Json;
 use serde_json;
 use serde_json::Value;
@@ -31,6 +31,9 @@ pub fn routes() -> Vec<Route> {
         generate_yubikey,
         activate_yubikey,
         activate_yubikey_put,
+        get_duo,
+        activate_duo,
+        activate_duo_put,
     ]
 }
 
@@ -231,7 +234,6 @@ pub fn validate_totp_code_str(totp_code: &str, secret: &str) -> EmptyResult {
 }
 
 pub fn validate_totp_code(totp_code: u64, secret: &str) -> EmptyResult {
-    use data_encoding::BASE32;
     use oath::{totp_raw_now, HashType};
 
     let decoded_secret = match BASE32.decode(secret.as_bytes()) {
@@ -714,3 +716,328 @@ pub fn validate_yubikey_login(response: &str, twofactor_data: &str) -> EmptyResu
         Err(_e) => err!("Failed to verify Yubikey against OTP server"),
     }
 }
+
+#[derive(Serialize, Deserialize)]
+struct DuoData {
+    host: String,
+    ik: String,
+    sk: String,
+}
+
+impl DuoData {
+    fn global() -> Option<Self> {
+        match CONFIG.duo_host() {
+            Some(host) => Some(Self {
+                host,
+                ik: CONFIG.duo_ikey().unwrap(),
+                sk: CONFIG.duo_skey().unwrap(),
+            }),
+            None => None,
+        }
+
+    }
+    fn msg(s: &str) -> Self {
+        Self {
+            host: s.into(),
+            ik: s.into(),
+            sk: s.into(),
+        }
+    }
+    fn secret() -> Self {
+        Self::msg("<global_secret>")
+    }
+    fn obscure(self) -> Self {
+        let mut host = self.host;
+        let mut ik = self.ik;
+        let mut sk = self.sk;
+
+        let digits = 4;
+        let replaced = "************";
+
+        host.replace_range(digits.., replaced);
+        ik.replace_range(digits.., replaced);
+        sk.replace_range(digits.., replaced);
+
+        Self { host, ik, sk }
+    }
+}
+
+
+enum DuoStatus {
+    Global(DuoData), // Using the global duo config
+    User(DuoData),   // Using the user's config
+    Disabled(bool),  // True if there is a global setting
+}
+
+impl DuoStatus {
+    fn data(self) -> Option<DuoData> {
+        match self {
+            DuoStatus::Global(data) => Some(data),
+            DuoStatus::User(data) => Some(data),
+            DuoStatus::Disabled(_) => None,
+        }
+    }
+}
+const DISABLED_MESSAGE_DEFAULT: &str = "<To use the global Duo keys, please leave these fields untouched>";
+
+#[post("/two-factor/get-duo", data = "<data>")]
+fn get_duo(data: JsonUpcase<PasswordData>, headers: Headers, conn: DbConn) -> JsonResult {
+    let data: PasswordData = data.into_inner().data;
+
+    if !headers.user.check_valid_password(&data.MasterPasswordHash) {
+        err!("Invalid password");
+    }
+
+    let data = get_user_duo_data(&headers.user.uuid, &conn);
+
+    let (enabled, data) = match data {
+        DuoStatus::Global(_) => (true, Some(DuoData::secret())),
+        DuoStatus::User(data) => (true, Some(data.obscure())),
+        DuoStatus::Disabled(true) => (false, Some(DuoData::msg(DISABLED_MESSAGE_DEFAULT))),
+        DuoStatus::Disabled(false) => (false, None),
+    };
+
+    let json = if let Some(data) = data {
+        json!({
+            "Enabled": enabled,
+            "Host": data.host,
+            "SecretKey": data.sk,
+            "IntegrationKey": data.ik,
+            "Object": "twoFactorDuo"
+        })
+    } else {
+        json!({
+            "Enabled": enabled,
+            "Object": "twoFactorDuo"
+        })
+    };
+
+    Ok(Json(json))
+}
+
+#[derive(Deserialize)]
+#[allow(non_snake_case, dead_code)]
+struct EnableDuoData {
+    MasterPasswordHash: String,
+    Host: String,
+    SecretKey: String,
+    IntegrationKey: String,
+}
+
+impl From<EnableDuoData> for DuoData {
+    fn from(d: EnableDuoData) -> Self {
+        Self {
+            host: d.Host,
+            ik: d.IntegrationKey,
+            sk: d.SecretKey,
+        }
+    }
+}
+
+fn check_duo_fields_custom(data: &EnableDuoData) -> bool {
+    fn empty_or_default(s: &str) -> bool {
+        let st = s.trim();
+        st.is_empty() || s == DISABLED_MESSAGE_DEFAULT
+    }
+
+    !empty_or_default(&data.Host) && !empty_or_default(&data.SecretKey) && !empty_or_default(&data.IntegrationKey)
+}
+
+#[post("/two-factor/duo", data = "<data>")]
+fn activate_duo(data: JsonUpcase<EnableDuoData>, headers: Headers, conn: DbConn) -> JsonResult {
+    let data: EnableDuoData = data.into_inner().data;
+
+    if !headers.user.check_valid_password(&data.MasterPasswordHash) {
+        err!("Invalid password");
+    }
+
+    let (data, data_str) = if check_duo_fields_custom(&data) {
+        let data_req: DuoData = data.into();
+        let data_str = serde_json::to_string(&data_req)?;
+        //duo_api_request("GET", "/auth/v2/check", "", &data_req).map_res("Failed to validate Duo credentials")?;
+        (data_req.obscure(), data_str)
+    } else {
+        (DuoData::secret(), String::new())
+    };
+
+    let type_ = TwoFactorType::Duo;
+    let twofactor = TwoFactor::new(headers.user.uuid.clone(), type_, data_str);
+    twofactor.save(&conn)?;
+
+    Ok(Json(json!({
+        "Enabled": true,
+        "Host": data.host,
+        "SecretKey": data.sk,
+        "IntegrationKey": data.ik,
+        "Object": "twoFactorDuo"
+    })))
+}
+
+#[put("/two-factor/duo", data = "<data>")]
+fn activate_duo_put(data: JsonUpcase<EnableDuoData>, headers: Headers, conn: DbConn) -> JsonResult {
+    activate_duo(data, headers, conn)
+}
+
+fn duo_api_request(method: &str, path: &str, params: &str, data: &DuoData) -> EmptyResult {
+    const AGENT: &str = "bitwarden_rs:Duo/1.0 (Rust)";
+
+    use reqwest::{header::*, Client, Method};
+    use std::str::FromStr;
+
+    let url = format!("https://{}{}", &data.host, path);
+    let date = Utc::now().to_rfc2822();
+    let username = &data.ik;
+    let fields = [&date, method, &data.host, path, params];
+    let password = crypto::hmac_sign(&data.sk, &fields.join("\n"));
+
+    let m = Method::from_str(method).unwrap_or_default();
+
+    Client::new()
+        .request(m, &url)
+        .basic_auth(username, Some(password))
+        .header(USER_AGENT, AGENT)
+        .header(DATE, date)
+        .send()?
+        .error_for_status()?;
+
+    Ok(())
+}
+
+const DUO_EXPIRE: i64 = 300;
+const APP_EXPIRE: i64 = 3600;
+
+const AUTH_PREFIX: &str = "AUTH";
+const DUO_PREFIX: &str = "TX";
+const APP_PREFIX: &str = "APP";
+
+use chrono::Utc;
+
+
+fn get_user_duo_data(uuid: &str, conn: &DbConn) -> DuoStatus {
+    let type_ = TwoFactorType::Duo as i32;
+
+    // If the user doesn't have an entry, disabled
+    let twofactor = match TwoFactor::find_by_user_and_type(uuid, type_, &conn) {
+        Some(t) => t,
+        None => return DuoStatus::Disabled(DuoData::global().is_some()),
+    };
+
+    // If the user has the required values, we use those
+    if let Ok(data) = serde_json::from_str(&twofactor.data) {
+        return DuoStatus::User(data);
+    }
+
+    // Otherwise, we try to use the globals
+    if let Some(global) = DuoData::global() {
+        return DuoStatus::Global(global);
+    }
+
+    // If there are no globals configured, just disable it
+    DuoStatus::Disabled(false)
+}
+
+// let (ik, sk, ak) = get_duo_keys();
+fn get_duo_keys_email(email: &str, conn: &DbConn) -> ApiResult<(String, String, String)> {
+    let data = User::find_by_mail(email, &conn)
+        .and_then(|u| get_user_duo_data(&u.uuid, &conn).data())
+        .or_else(|| DuoData::global())
+        .map_res("Can't fetch Duo keys")?;
+
+    Ok((data.ik, data.sk, CONFIG.get_duo_akey()))
+}
+
+pub fn generate_duo_signature(email: &str, conn: &DbConn) -> ApiResult<String> {
+    let now = Utc::now().timestamp();
+
+    let (ik, sk, ak) = get_duo_keys_email(email, conn)?;
+
+    let duo_sign = sign_duo_values(&sk, email, &ik, DUO_PREFIX, now + DUO_EXPIRE);
+    let app_sign = sign_duo_values(&ak, email, &ik, APP_PREFIX, now + APP_EXPIRE);
+
+    Ok(format!("{}:{}", duo_sign, app_sign))
+}
+
+fn sign_duo_values(key: &str, email: &str, ikey: &str, prefix: &str, expire: i64) -> String {
+    let val = format!("{}|{}|{}", email, ikey, expire);
+    let cookie = format!("{}|{}", prefix, BASE64.encode(val.as_bytes()));
+
+    format!("{}|{}", cookie, crypto::hmac_sign(key, &cookie))
+}
+
+pub fn validate_duo_login(email: &str, response: &str, conn: &DbConn) -> EmptyResult {
+    let split: Vec<&str> = response.split(':').collect();
+    if split.len() != 2 {
+        err!("Invalid response length");
+    }
+
+    let auth_sig = split[0];
+    let app_sig = split[1];
+
+    let now = Utc::now().timestamp();
+
+    let (ik, sk, ak) = get_duo_keys_email(email, conn)?;
+
+    let auth_user = parse_duo_values(&sk, auth_sig, &ik, AUTH_PREFIX, now)?;
+    let app_user = parse_duo_values(&ak, app_sig, &ik, APP_PREFIX, now)?;
+
+    if !crypto::ct_eq(&auth_user, app_user) || !crypto::ct_eq(&auth_user, email) {
+        err!("Error validating duo authentication")
+    }
+
+    Ok(())
+}
+
+fn parse_duo_values(key: &str, val: &str, ikey: &str, prefix: &str, time: i64) -> ApiResult<String> {
+    let split: Vec<&str> = val.split('|').collect();
+    if split.len() != 3 {
+        err!("Invalid value length")
+    }
+
+    let u_prefix = split[0];
+    let u_b64 = split[1];
+    let u_sig = split[2];
+
+    let sig = crypto::hmac_sign(key, &format!("{}|{}", u_prefix, u_b64));
+
+    if !crypto::ct_eq(crypto::hmac_sign(key, &sig), crypto::hmac_sign(key, u_sig)) {
+        err!("Duo signatures don't match")
+    }
+
+    if u_prefix != prefix {
+        err!("Prefixes don't match")
+    }
+
+    let cookie_vec = match BASE64.decode(u_b64.as_bytes()) {
+        Ok(c) => c,
+        Err(_) => err!("Invalid Duo cookie encoding"),
+    };
+
+    let cookie = match String::from_utf8(cookie_vec) {
+        Ok(c) => c,
+        Err(_) => err!("Invalid Duo cookie encoding"),
+    };
+
+    let cookie_split: Vec<&str> = cookie.split('|').collect();
+    if cookie_split.len() != 3 {
+        err!("Invalid cookie length")
+    }
+
+    let username = cookie_split[0];
+    let u_ikey = cookie_split[1];
+    let expire = cookie_split[2];
+
+    if !crypto::ct_eq(ikey, u_ikey) {
+        err!("Invalid ikey")
+    }
+
+    let expire = match expire.parse() {
+        Ok(e) => e,
+        Err(_) => err!("Invalid expire time"),
+    };
+
+    if time >= expire {
+        err!("Expired authorization")
+    }
+
+    Ok(username.into())
+}

src/api/identity.rs

@@ -9,7 +9,7 @@ use num_traits::FromPrimitive;
 use crate::db::models::*;
 use crate::db::DbConn;
 
-use crate::util::{self, JsonMap};
+use crate::util;
 
 use crate::api::{ApiResult, EmptyResult, JsonResult};
 
@@ -178,6 +178,7 @@ fn twofactor_auth(
         Some(TwoFactorType::Authenticator) => _tf::validate_totp_code_str(twofactor_code, &selected_data?)?,
         Some(TwoFactorType::U2f) => _tf::validate_u2f_login(user_uuid, twofactor_code, conn)?,
         Some(TwoFactorType::YubiKey) => _tf::validate_yubikey_login(twofactor_code, &selected_data?)?,
+        Some(TwoFactorType::Duo) => _tf::validate_duo_login(data.username.as_ref().unwrap(), twofactor_code, conn)?,
 
         Some(TwoFactorType::Remember) => {
             match device.twofactor_remember {
@@ -226,22 +227,33 @@ fn _json_err_twofactor(providers: &[i32], user_uuid: &str, conn: &DbConn) -> Api
                 let mut challenge_list = Vec::new();
 
                 for key in request.registered_keys {
-                    let mut challenge_map = JsonMap::new();
-
-                    challenge_map.insert("appId".into(), Value::String(request.app_id.clone()));
-                    challenge_map.insert("challenge".into(), Value::String(request.challenge.clone()));
-                    challenge_map.insert("version".into(), Value::String(key.version));
-                    challenge_map.insert("keyHandle".into(), Value::String(key.key_handle.unwrap_or_default()));
-
-                    challenge_list.push(Value::Object(challenge_map));
+                    challenge_list.push(json!({
+                        "appId": request.app_id,
+                        "challenge": request.challenge,
+                        "version": key.version,
+                        "keyHandle": key.key_handle,
+                    }));
                 }
 
-                let mut map = JsonMap::new();
-                use serde_json;
                 let challenge_list_str = serde_json::to_string(&challenge_list).unwrap();
 
-                map.insert("Challenges".into(), Value::String(challenge_list_str));
-                result["TwoFactorProviders2"][provider.to_string()] = Value::Object(map);
+                result["TwoFactorProviders2"][provider.to_string()] = json!({
+                    "Challenges": challenge_list_str,
+                });
+            }
+
+            Some(TwoFactorType::Duo) => {
+                let email = match User::find_by_uuid(user_uuid, &conn) {
+                    Some(u) => u.email,
+                    None => err!("User does not exist"),
+                };
+
+                let signature = two_factor::generate_duo_signature(&email, conn)?;
+
+                result["TwoFactorProviders2"][provider.to_string()] = json!({
+                    "Host": CONFIG.duo_host(),
+                    "Signature": signature,
+                });
             }
 
             Some(tf_type @ TwoFactorType::YubiKey) => {
@@ -250,12 +262,11 @@ fn _json_err_twofactor(providers: &[i32], user_uuid: &str, conn: &DbConn) -> Api
                     None => err!("No YubiKey devices registered"),
                 };
 
-                let yubikey_metadata: two_factor::YubikeyMetadata =
-                    serde_json::from_str(&twofactor.data).expect("Can't parse Yubikey Metadata");
+                let yubikey_metadata: two_factor::YubikeyMetadata = serde_json::from_str(&twofactor.data)?;
 
-                let mut map = JsonMap::new();
-                map.insert("Nfc".into(), Value::Bool(yubikey_metadata.Nfc));
-                result["TwoFactorProviders2"][provider.to_string()] = Value::Object(map);
+                result["TwoFactorProviders2"][provider.to_string()] = json!({
+                    "Nfc": yubikey_metadata.Nfc,
+                })
             }
 
             _ => {}

src/config.rs

@@ -9,7 +9,10 @@ lazy_static! {
         println!("Error loading config:\n\t{:?}\n", e);
         exit(12)
     });
-    pub static ref CONFIG_FILE: String = get_env("CONFIG_FILE").unwrap_or_else(|| "data/config.json".into());
+    pub static ref CONFIG_FILE: String = {
+        let data_folder = get_env("DATA_FOLDER").unwrap_or_else(|| String::from("data"));
+        get_env("CONFIG_FILE").unwrap_or_else(|| format!("{}/config.json", data_folder))
+    };
 }
 
 pub type Pass = String;
@@ -61,7 +64,7 @@ macro_rules! make_config {
 
             /// Merges the values of both builders into a new builder.
             /// If both have the same element, `other` wins.
-            fn merge(&self, other: &Self) -> Self {
+            fn merge(&self, other: &Self, show_overrides: bool) -> Self {
                 let mut overrides = Vec::new();
                 let mut builder = self.clone();
                 $($(
@@ -74,7 +77,7 @@ macro_rules! make_config {
                     }
                 )+)+
 
-                if !overrides.is_empty() {
+                if show_overrides && !overrides.is_empty() {
                     // We can't use warn! here because logging isn't setup yet.
                     println!("[WARNING] The following environment variables are being overriden by the config file,");
                     println!("[WARNING] please use the admin panel to make changes to them:");
@@ -302,6 +305,20 @@ make_config! {
         yubico_server:          String, true,   option;
     },
 
+    /// Global Duo settings (Note that users can override them)
+    duo: _enable_duo {
+        /// Enabled
+        _enable_duo:            bool,   true,   def,     false;
+        /// Integration Key
+        duo_ikey:               String, true,   option;
+        /// Secret Key
+        duo_skey:               Pass,   true,   option;
+        /// Host
+        duo_host:               String, true,   option;
+        /// Application Key (generated automatically)
+        _duo_akey:              Pass,   false,  option;
+    },
+
     /// SMTP Email Settings
     smtp: _enable_smtp {
         /// Enabled
@@ -332,6 +349,12 @@ fn validate_config(cfg: &ConfigItems) -> Result<(), Error> {
         }
     }
 
+    if (cfg.duo_host.is_some() || cfg.duo_ikey.is_some() || cfg.duo_skey.is_some())
+        && !(cfg.duo_host.is_some() && cfg.duo_ikey.is_some() && cfg.duo_skey.is_some())
+    {
+        err!("All Duo options need to be set for global Duo support")
+    }
+
     if cfg.yubico_client_id.is_some() != cfg.yubico_secret_key.is_some() {
         err!("Both `YUBICO_CLIENT_ID` and `YUBICO_SECRET_KEY` need to be set for Yubikey OTP support")
     }
@@ -354,7 +377,7 @@ impl Config {
         let _usr = ConfigBuilder::from_file(&CONFIG_FILE).unwrap_or_default();
 
         // Create merged config, config file overwrites env
-        let builder = _env.merge(&_usr);
+        let builder = _env.merge(&_usr, true);
 
         // Fill any missing with defaults
         let config = builder.build();
@@ -383,7 +406,7 @@ impl Config {
         // Prepare the combined config
         let config = {
             let env = &self.inner.read().unwrap()._env;
-            env.merge(&builder).build()
+            env.merge(&builder, false).build()
         };
         validate_config(&config)?;
 
@@ -402,6 +425,14 @@ impl Config {
         Ok(())
     }
 
+    pub fn update_config_partial(&self, other: ConfigBuilder) -> Result<(), Error> {
+        let builder = {
+            let usr = &self.inner.read().unwrap()._usr;
+            usr.merge(&other, false)
+        };
+        self.update_config(builder)
+    }
+
     pub fn delete_user_config(&self) -> Result<(), Error> {
         crate::util::delete_file(&CONFIG_FILE)?;
 
@@ -437,9 +468,21 @@ impl Config {
         let inner = &self.inner.read().unwrap().config;
         inner._enable_smtp && inner.smtp_host.is_some()
     }
-    pub fn yubico_enabled(&self) -> bool {
-        let inner = &self.inner.read().unwrap().config;
-        inner._enable_yubico && inner.yubico_client_id.is_some() && inner.yubico_secret_key.is_some()
+
+    pub fn get_duo_akey(&self) -> String {
+        if let Some(akey) = self._duo_akey() {
+            akey
+        } else {
+            let akey = crate::crypto::get_random_64();
+            let akey_s = data_encoding::BASE64.encode(&akey);
+
+            // Save the new value
+            let mut builder = ConfigBuilder::default();
+            builder._duo_akey = Some(akey_s.clone());
+            self.update_config_partial(builder).ok();
+
+            akey_s
+        }
     }
 
     pub fn render_template<T: serde::ser::Serialize>(

src/crypto.rs

@@ -2,7 +2,7 @@
 // PBKDF2 derivation
 //
 
-use ring::{digest, pbkdf2};
+use ring::{digest, pbkdf2, hmac};
 
 static DIGEST_ALG: &digest::Algorithm = &digest::SHA256;
 const OUTPUT_LEN: usize = digest::SHA256_OUTPUT_LEN;
@@ -19,6 +19,18 @@ pub fn verify_password_hash(secret: &[u8], salt: &[u8], previous: &[u8], iterati
     pbkdf2::verify(DIGEST_ALG, iterations, salt, secret, previous).is_ok()
 }
 
+//
+// HMAC
+//
+pub fn hmac_sign(key: &str, data:&str) -> String {
+    use data_encoding::HEXLOWER;
+
+    let key = hmac::SigningKey::new(&digest::SHA1, key.as_bytes());
+    let signature = hmac::sign(&key, data.as_bytes());
+
+    HEXLOWER.encode(signature.as_ref())
+}
+
 //
 // Random values
 //

src/db/models/cipher.rs

@@ -72,9 +72,7 @@ use crate::error::MapResult;
 /// Database methods
 impl Cipher {
     pub fn to_json(&self, host: &str, user_uuid: &str, conn: &DbConn) -> Value {
-        use super::Attachment;
         use crate::util::format_date;
-        use serde_json;
 
         let attachments = Attachment::find_by_cipher(&self.uuid, conn);
         let attachments_json: Vec<Value> = attachments.iter().map(|c| c.to_json(host)).collect();

src/db/models/user.rs

@@ -119,8 +119,6 @@ use crate::error::MapResult;
 /// Database methods
 impl User {
     pub fn to_json(&self, conn: &DbConn) -> Value {
-        use super::{TwoFactor, UserOrganization};
-
         let orgs = UserOrganization::find_by_user(&self.uuid, conn);
         let orgs_json: Vec<Value> = orgs.iter().map(|c| c.to_json(&conn)).collect();
         let twofactor_enabled = !TwoFactor::find_by_user(&self.uuid, conn).is_empty();

src/error.rs

@@ -41,6 +41,8 @@ use regex::Error as RegexErr;
 use reqwest::Error as ReqErr;
 use serde_json::{Error as SerdeErr, Value};
 use std::io::Error as IOErr;
+
+use std::option::NoneError as NoneErr;
 use std::time::SystemTimeError as TimeErr;
 use u2f::u2ferror::U2fError as U2fErr;
 use yubico::yubicoerror::YubicoError as YubiErr;
@@ -73,6 +75,13 @@ make_error! {
     YubiError(YubiErr):   _has_source, _api_error,
 }
 
+// This is implemented by hand because NoneError doesn't implement neither Display nor Error
+impl From<NoneErr> for Error {
+    fn from(_: NoneErr) -> Self {
+        Error::from(("NoneError", String::new()))
+    }
+}
+
 impl std::fmt::Debug for Error {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         match self.source() {
@@ -118,6 +127,12 @@ impl<E: Into<Error>> MapResult<()> for Result<usize, E> {
     }
 }
 
+impl<S> MapResult<S> for Option<S> {
+    fn map_res(self, msg: &str) -> Result<S, Error> {
+        self.ok_or_else(|| Error::new(msg, ""))
+    }
+}
+
 fn _has_source<T>(e: T) -> Option<T> {
     Some(e)
 }