semgrep-scalafix

The goal of semgrep-scalafix is to provide scalafix rules for checks that exist as semgrep rules.

Usage

These scalafix rules are cross-published for Scala versions 2.12 and 2.13.

To use the latest version, include the following in your build.sbt:

ThisBuild / scalafixDependencies += 
  "com.banno" %% "semgrep-scalafix" % "0.3.0"

Once enabled, configure which rules scalafix will run by adding them to your .scalafix.conf file like so:

//.scalafix.conf
rules = [
  NoRsaWithoutPadding
]

Available Rules

NoRsaWithoutPadding

Relevant semgrep rule: scala.lang.security.audit.rsa-padding-set.rsa-padding-set.

This scalafix rule will raise an error if a javax.crypto.Cipher is instantiated using RSA, any mode, with no padding. For example:

import javax.crypto.Cipher

val badCipher = Cipher.getInstance("RSA/None/NoPadding") // will raise scalafix error
val alsoBad   = Cipher.getInstance("RSA/ECB/NoPadding") // will raise scalafix error

val goodCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding")