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/*
* Copyright 2022 Greenfossil Pte Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.greenfossil.thorium
import com.typesafe.config.*
import org.slf4j.{Logger, LoggerFactory}
import java.nio.charset.StandardCharsets
import java.security.MessageDigest
import java.time
import java.time.Duration
import java.util.Base64
import scala.util.*
import scala.jdk.CollectionConverters.*
type SameSiteCookie = "Strict" | "Lax" | "None"
private[thorium] val configurationLogger: Logger = LoggerFactory.getLogger("com.greenfossil.thorium.configuration")
val APP_HTTP__CONTEXT = "app.http.context"
val APP_HTTP__PORT = "app.http.port"
val APP_HTTP__MAX_NUM_CONNECTION = "app.http.maxNumConnection"
val APP_HTTP__MAX_REQUEST_LENGHT = "app.http.maxRequestLength"
val APP_HTTP__REQUEST_TIMEOUT = "app.http.requestTimeout"
val APP_HTTP__SECRET_KEY = "app.http.secret.key"
val APP_HTTP__SECRET_PROVIDER = "app.http.secret.provider"
val APP_HTTP_COOKIES__SECURE = "app.http.cookies.secure"
val APP_HTTP_COOKIES__MAX_AGE = "app.http.cookies.maxAge"
val APP_HTTP_COOKIES__HTTP_ONLY = "app.http.cookies.httpOnly"
val APP_HTTP_COOKIES__DOMAIN = "app.http.cookies.domain"
val APP_HTTP_COOKIES__PATH = "app.http.cookies.path"
val APP_HTTP_COOKIES__SAMESITE = "app.http.cookies.sameSite"
val APP_HTTP_COOKIES__HOST_ONLY = "app.http.cookies.hostOnly"
val APP_HTTP_COOKIES__JWT = "app.http.cookies.jwt"
val APP_HTTP_SESSION__COOKIE_NAME = "app.http.session.cookieName"
val APP_HTTP_SESSION__SECURE = "app.http.session.secure"
val APP_HTTP_SESSION__MAX_AGE = "app.http.session.maxAge"
val APP_HTTP_SESSION__HTTP_ONLY = "app.http.session.httpOnly"
val APP_HTTP_SESSION__DOMAIN = "app.http.session.domain"
val APP_HTTP_SESSION__PATH = "app.http.session.path"
val APP_HTTP_SESSION__SAME_SITE = "app.http.session.sameSite"
val APP_HTTP_SESSION__JWT = "app.http.session.jwt"
val APP_HTTP_FLASH__COOKIE_NAME = "app.http.flash.cookieName"
val APP_HTTP_FLASH__SECURE = "app.http.flash.secure"
val APP_HTTP_FLASH__HTTP_ONLY = "app.http.flash.httpOnly"
val APP_HTTP_FLASH__DOMAIN = "app.http.flash.domain"
val APP_HTTP_FLASH__PATH = "app.http.flash.path"
val APP_HTTP_FLASH__SAME_SITE = "app.http.flash.sameSite"
val APP_HTTP_FLASH__JWT = "app.http.flash.jwt"
val APP_HTTP_CSRF__COOKIE_NAME = "app.http.csrf.cookieName"
val APP_HTTP_CSRF__SECURE = "app.http.csrf.secure"
val APP_HTTP_CSRF__HTTP_ONLY = "app.http.csrf.httpOnly"
val APP_HTTP_CSRF__DOMAIN = "app.http.csrf.domain"
val APP_HTTP_CSRF__PATH = "app.http.csrf.path"
val APP_HTTP_CSRF__SAME_SITE = "app.http.csrf.sameSite"
val APP_HTTP_CSRF__JWT = "app.http.csrf.jwt"
val APP_HTTP_CSRF__ALLOW_PATH_PREFIXES = "app.http.csrf.allowPathPrefixes"
val APP_HTTP_RECAPTCHA__SECRETKEY = "app.http.recaptcha.secretKey"
val APP_HTTP_RECAPTCHA__SITEKEY = "app.http.recaptcha.siteKey"
val APP_HTTP_RECAPTCHA__TOKENNAME = "app.http.recaptcha.tokenName"
val APP_HTTP_RECAPTCHA__TIMEOUT = "app.http.recaptcha.timeout"
object HttpConfiguration:
def from(config: Config, environment: Environment): HttpConfiguration =
HttpConfiguration(
context = config.getString(APP_HTTP__CONTEXT),
httpPort = config.getInt(APP_HTTP__PORT),
maxNumConnectionOpt = config.getIntOpt(APP_HTTP__MAX_NUM_CONNECTION),
maxRequestLength = config.getInt(APP_HTTP__MAX_REQUEST_LENGHT),
requestTimeout = config.getDuration(APP_HTTP__REQUEST_TIMEOUT),
cookieConfig = CookieConfiguration(
secure = config.getBoolean(APP_HTTP_COOKIES__SECURE),
maxAge = config.getDurationOpt(APP_HTTP_COOKIES__MAX_AGE),
httpOnly = config.getBoolean(APP_HTTP_COOKIES__HTTP_ONLY),
domain = config.getStringOpt(APP_HTTP_COOKIES__DOMAIN),
path = config.getString(APP_HTTP_COOKIES__PATH),
sameSite = config.getStringOpt(APP_HTTP_COOKIES__SAMESITE).map(_.asInstanceOf[SameSiteCookie]),
hostOnly = config.getBooleanOpt(APP_HTTP_COOKIES__HOST_ONLY),
jwt = JWTConfigurationParser(config, APP_HTTP_COOKIES__JWT)
),
sessionConfig = SessionConfiguration(
cookieName = config.getString(APP_HTTP_SESSION__COOKIE_NAME),
secure = config.getBoolean(APP_HTTP_SESSION__SECURE),
maxAge = config.getDurationOpt(APP_HTTP_SESSION__MAX_AGE),
httpOnly = config.getBoolean(APP_HTTP_SESSION__HTTP_ONLY),
domain = config.getStringOpt(APP_HTTP_SESSION__DOMAIN),
path = config.getString(APP_HTTP_SESSION__PATH),
sameSite = config.getStringOpt(APP_HTTP_SESSION__SAME_SITE).map(_.asInstanceOf[SameSiteCookie]),
jwt = JWTConfigurationParser(config, APP_HTTP_SESSION__JWT)
),
flashConfig = FlashConfiguration(
cookieName = config.getString(APP_HTTP_FLASH__COOKIE_NAME),
secure = config.getBoolean(APP_HTTP_FLASH__SECURE),
httpOnly = config.getBoolean(APP_HTTP_FLASH__HTTP_ONLY),
domain = config.getStringOpt(APP_HTTP_FLASH__DOMAIN),
path = config.getString(APP_HTTP_FLASH__PATH),
sameSite = config.getStringOpt(APP_HTTP_FLASH__SAME_SITE).map(_.asInstanceOf[SameSiteCookie]),
jwt = JWTConfigurationParser(config, APP_HTTP_FLASH__JWT)
),
csrfConfig = CSRFConfiguration(
cookieName = config.getString(APP_HTTP_CSRF__COOKIE_NAME),
secure = config.getBoolean(APP_HTTP_CSRF__SECURE),
httpOnly = config.getBoolean(APP_HTTP_CSRF__HTTP_ONLY),
domain = config.getStringOpt(APP_HTTP_CSRF__DOMAIN),
path = config.getString(APP_HTTP_CSRF__PATH),
sameSite = config.getStringOpt(APP_HTTP_CSRF__SAME_SITE).map(_.asInstanceOf[SameSiteCookie]),
jwt = JWTConfigurationParser(config, APP_HTTP_CSRF__JWT),
allowPathPrefixes = config.getStringList(APP_HTTP_CSRF__ALLOW_PATH_PREFIXES).asScala.toSeq
),
recaptchaConfig = RecaptchaConfiguration(
secretKey = config.getString(APP_HTTP_RECAPTCHA__SECRETKEY),
siteKey = config.getString(APP_HTTP_RECAPTCHA__SITEKEY),
tokenName = config.getString(APP_HTTP_RECAPTCHA__TOKENNAME),
timeout = config.getInt(APP_HTTP_RECAPTCHA__TIMEOUT)
),
secretConfig = getSecretConfiguration(config, environment),
environment = environment
)
/**
*
* @param context
* @param httpPort The HTTP port number
* @param maxConnectionOpt The maximum number of accepted HTTP connections
* @param maxRequestLength The maximum allowed length of HTTP content in bytes
* @param requestTimeout Number of seconds before HTTP request times out
* @param sessionConfig The session configuration
* @param flashConfig The flash configuration
* @param secretConfig The application secret
* @param environment The application environment
*/
case class HttpConfiguration(
context: String = "/",
httpPort: Int = 8080,
maxNumConnectionOpt: Option[Int] = None,
maxRequestLength: Int = 10485760,
requestTimeout: Duration = Duration.ofSeconds(10),
cookieConfig: CookieConfiguration = CookieConfiguration(),
sessionConfig: SessionConfiguration = SessionConfiguration(),
flashConfig: FlashConfiguration = FlashConfiguration(),
csrfConfig: CSRFConfiguration = CSRFConfiguration(),
recaptchaConfig: RecaptchaConfiguration = RecaptchaConfiguration("change-me","change-me", "g-recaptcha-response", 3000),
secretConfig: SecretConfiguration = SecretConfiguration(),
environment: Environment
)
trait CookieConfigurationLike:
val secure: Boolean
val maxAge: Option[Duration]
val httpOnly: Boolean
val domain: Option[String]
val path: String
val sameSite: Option[SameSiteCookie]
val hostOnly: Option[Boolean]
val jwt: JWTConfiguration
/**
* The cookie configuration
*
* @param secure Whether the session cookie should set the secure flag or not
* @param maxAge The max age of the session, none, use "session" sessions
* @param httpOnly Whether the HTTP only attribute of the cookie should be set
* @param domain The domain to set for the session cookie, if defined
* @param path The path for which this cookie is valid
* @param sameSite The cookie's SameSite attribute
* @param hostOnly The cookie's host-only attribute
* @param jwt The JWT specific information
*/
case class CookieConfiguration(
secure: Boolean = false,
maxAge: Option[Duration] = None,
httpOnly: Boolean = true,
domain: Option[String] = None,
path: String = "/",
sameSite: Option[SameSiteCookie] = Some("Lax"),
hostOnly: Option[Boolean] = Some(false),
jwt: JWTConfiguration = JWTConfiguration()
) extends CookieConfigurationLike
/**
* The session configuration
*
* @param cookieName The name of the cookie used to store the session
* @param secure Whether the session cookie should set the secure flag or not
* @param maxAge The max age of the session, none, use "session" sessions
* @param httpOnly Whether the HTTP only attribute of the cookie should be set
* @param domain The domain to set for the session cookie, if defined
* @param path The path for which this cookie is valid
* @param sameSite The cookie's SameSite attribute
* @param jwt The JWT specific information
*/
case class SessionConfiguration(
cookieName: String = "APP_SESSION",
secure: Boolean = false,
maxAge: Option[Duration] = None,
httpOnly: Boolean = true,
domain: Option[String] = None,
path: String = "/",
sameSite: Option[SameSiteCookie] = Some("Lax"),
hostOnly: Option[Boolean] = None,
jwt: JWTConfiguration = JWTConfiguration()
) extends CookieConfigurationLike
/**
* The flash configuration
*
* @param cookieName The name of the cookie used to store the session
* @param secure Whether the flash cookie should set the secure flag or not
* @param httpOnly Whether the HTTP only attribute of the cookie should be set
* @param domain The domain to set for the session cookie, if defined
* @param path The path for which this cookie is valid
* @param sameSite The cookie's SameSite attribute
* @param jwt The JWT specific information
*/
case class FlashConfiguration(
cookieName: String = "APP_FLASH",
secure: Boolean = false,
maxAge: Option[Duration] = None,
httpOnly: Boolean = true,
domain: Option[String] = None,
path: String = "/",
sameSite: Option[SameSiteCookie] = Some("Lax"),
hostOnly: Option[Boolean] = None,
jwt: JWTConfiguration = JWTConfiguration()
) extends CookieConfigurationLike
/**
* The csrf configuration
*
* @param cookieName The name of the cookie used to store the session
* @param secure Whether the csrf cookie should set the secure flag or not
* @param httpOnly Whether the HTTP only attribute of the cookie should be set
* @param domain The domain to set for the session cookie, if defined
* @param path The path for which this cookie is valid
* @param sameSite The cookie's SameSite attribute
* @param jwt The JWT specific information
*/
case class CSRFConfiguration(
cookieName: String = "APP_CSRF_TOKEN",
secure: Boolean = false,
maxAge: Option[Duration] = None,
httpOnly: Boolean = true,
domain: Option[String] = None,
path: String = "/",
sameSite: Option[SameSiteCookie] = Some("Strict"),
hostOnly: Option[Boolean] = None,
jwt: JWTConfiguration = JWTConfiguration(),
allowPathPrefixes: Seq[String] = Nil
) extends CookieConfigurationLike
case class RecaptchaConfiguration(
secretKey: String,
siteKey: String,
tokenName: String,
timeout: Int /*request timeout*/,
)
/**
* The application secret. Must be set. A value of "changeme" will cause the application to fail to start in
* production.
*
* 1. Encourage the practice of *not* using the same secret in dev and prod.
* 2. Make it obvious that the secret should be changed.
* 3. Ensure that in dev mode, the secret stays stable across restarts.
* 4. Ensure that in dev mode, sessions do not interfere with other applications that may be or have been running
* on localhost. Eg, if start App 1, and it stores a APP_SESSION cookie for localhost:8080, then stop
* it, and start App 2, when it reads the APP_SESSION cookie for localhost:8080, it should not see the
* session set by App 1. This can be achieved by using different secrets for the two, since if they are
* different, they will simply ignore the session cookie set by the other.
*
* To achieve 1 and 2, set the default secret to be "changeme". This should make
* it obvious that the secret needs to be changed and discourage using the same secret in dev and prod.
*
* For safety, if the secret is not set, or if it's changeme, and we are in prod mode, then we will fail fatally.
* This will further enforce both 1 and 2.
*
* To achieve 3, if in dev or test mode, if the secret is either changeme or not set, we will generate a secret
* based on the location of application.conf. This should be stable across restarts for a given application.
*
* To achieve 4, using the location of application.conf to generate the secret should ensure this.
*
* App secret is checked for a minimum length in production:
*
* 1. If the key is fifteen characters or fewer, a warning will be logged.
* 2. If the key is eight characters or fewer, then an error is thrown and the configuration is invalid.
*
* @param secret the application secret
* @param provider the JCE provider to use. If null, uses the platform default
*/
case class SecretConfiguration(secret: String = "changeme", provider: Option[String] = None)
object SecretConfiguration:
// https://crypto.stackexchange.com/a/34866 = 32 bytes (256 bits)
// https://security.stackexchange.com/a/11224 = (128 bits is more than enough)
// but if we have less than 8 bytes in production then it's not even 64 bits.
// which is almost certainly not from base64'ed /dev/urandom in any case, and is most
// probably a hardcoded text password.
// https://tools.ietf.org/html/rfc2898#section-4.1
val SHORTEST_SECRET_LENGTH = 9
// https://crypto.stackexchange.com/a/34866 = 32 bytes (256 bits)
// https://security.stackexchange.com/a/11224 = (128 bits is more than enough)
// 86 bits of random input is enough for a secret. This rounds up to 11 bytes.
// If we assume base64 encoded input, this comes out to at least 15 bytes, but
// it's highly likely to be a user inputted string, which has much, much lower
// entropy.
val SHORT_SECRET_LENGTH = 16
/**
* The JSON Web Token configuration
*
* @param signatureAlgorithm The signature algorithm used to sign the JWT
* @param expiresAfter The period of time after which the JWT expires, if any.
* @param clockSkew The amount of clock skew to permit for expiration / not before checks
* @param dataClaim The claim key corresponding to the data map passed in by the user
*/
case class JWTConfiguration(
signatureAlgorithm: String = "HS256",
expiresAfter: Option[Duration] = None,
clockSkew: Duration = Duration.ofSeconds(30),
dataClaim: String = "data"
)
object JWTConfigurationParser:
def apply(config: Config, parent: String): JWTConfiguration =
JWTConfiguration(
signatureAlgorithm = config.getString(s"${parent}.signatureAlgorithm"),
expiresAfter = config.getDurationOpt(s"${parent}.expiresAfter"),
clockSkew = config.getDuration(s"${parent}.clockSkew"),
dataClaim = config.getString(s"${parent}.dataClaim")
)
private def configError(
message: String,
origin: Option[ConfigOrigin] = None,
e: Option[Throwable] = None
): ExceptionSource = {
/*
The stable values here help us from putting a reference to a ConfigOrigin inside the anonymous ExceptionSource.
This is necessary to keep the Exception serializable, because ConfigOrigin is not serializable.
*/
val originLine = origin.map(_.lineNumber: java.lang.Integer).orNull
val originSourceName = origin.map(_.filename).orNull
val originUrlOpt = origin.flatMap(o => Option(o.url))
def readUrlAsString(url: java.net.URL): String =
Using.resource(url.openStream()){is =>
val buffer = Array.ofDim[Byte](is.available())
is.read(buffer)
new String(buffer)
}
new ExceptionSource:
val title = "Configuration error"
val description = message
val cause = e.orNull
val id = nextId
def line = originLine
def position = null
def input = originUrlOpt.map(readUrlAsString).orNull
def sourceName = originSourceName
override def toString = "Configuration error: " + message
}
/**
* Computes the MD5 digest for a byte array.
*
* @param bytes the data to hash
* @return the MD5 digest, encoded as a hex string
*/
private def md5(text: String): String =
val digest = MessageDigest.getInstance("MD5").digest(text.getBytes(StandardCharsets.UTF_8))
new String(Base64.getEncoder.encode(digest))
private def getSecretConfiguration(config: Config, environment: Environment): SecretConfiguration =
/**
* Creates a configuration error for a specific configuration key.
*
* For example:
* {{{
* val configuration = Configuration.load()
* throw configuration.reportError("engine.connectionUrl", "Cannot connect!")
* }}}
*
* @param path the configuration key, related to this error
* @param message the error message
* @param e the related exception
* @return a configuration exception
*/
def reportError(path: String, message: String, e: Option[Throwable] = None) =
val origin = Option(if (config.hasPath(path)) config.getValue(path).origin else config.root.origin)
configError(message, origin, e)
val Blank = """\s*""".r
val secret =
Option(config.getString(APP_HTTP__SECRET_KEY)) match {
case Some("changeme") | Some(Blank()) | None if environment.isProd =>
val message =
"""
|The application secret has not been set, and we are in prod mode. Your application is not secure.
""".stripMargin
throw reportError("app.http.secret", message)
case Some(s) if s.length < SecretConfiguration.SHORTEST_SECRET_LENGTH && environment.isProd =>
val message =
"""
|The application secret is too short and does not have the recommended amount of entropy. Your application is not secure.
""".stripMargin
throw reportError("app.http.secret", message)
case Some(s) if s.length < SecretConfiguration.SHORT_SECRET_LENGTH && environment.isProd =>
val message =
"""
|Your secret key is very short, and may be vulnerable to dictionary attacks. Your application may not be secure.
|The application secret should ideally be 32 bytes of completely random input, encoded in base64.
""".stripMargin
configurationLogger.warn(message)
s
case Some(s)
if s.length < SecretConfiguration.SHORTEST_SECRET_LENGTH && !s.equals("changeme") && s.trim.nonEmpty && environment.isDev =>
val message =
"""
|The application secret is too short and does not have the recommended amount of entropy. Your application is not secure
|and it will fail to start in production mode.
""".stripMargin
configurationLogger.warn(message)
s
case Some(s)
if s.length < SecretConfiguration.SHORT_SECRET_LENGTH && !s.equals("changeme") && s.trim.nonEmpty && environment.isDev =>
val message =
"""
|Your secret key is very short, and may be vulnerable to dictionary attacks. Your application may not be secure.
|The application secret should ideally be 32 bytes of completely random input, encoded in base64. While the application
|will be able to start in production mode, you will also see a warning when it is starting.
""".stripMargin
configurationLogger.warn(message)
s
case Some("changeme") | Some(Blank()) | None =>
val appConfLocation = environment.resource("application.conf")
// Try to generate a stable secret. Security is not the issue here, since this is just for tests and dev mode.
val secret = appConfLocation.fold(
// No application.conf? Oh well, just use something hard coded.
"she sells sea shells on the sea shore"
)(_.toString)
val md5Secret = md5(secret)
configurationLogger.debug(
s"Generated dev mode secret $md5Secret for app at ${appConfLocation.getOrElse("unknown location")}"
)
md5Secret
case Some(s) => s
}
val provider = config.getStringOpt(APP_HTTP__SECRET_PROVIDER)
SecretConfiguration(String.valueOf(secret), provider)
