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geoffw0geoffw0
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Swift: Split encryption queries into three parts (trivial re-organization of existing code).
1 parent f5a2853 commit e62a6a0

24 files changed

Lines changed: 498 additions & 383 deletions

‎swift/ql/lib/codeql/swift/security/ConstantPasswordExtensions.qll‎

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/**
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* Provides classes and predicates for reasoning about constant password
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* vulnerabilities.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow

‎swift/ql/lib/codeql/swift/security/ConstantPasswordQuery.qll‎

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/**
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* Provides a taint tracking configuration to find constant password
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* vulnerabilities.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow
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import codeql.swift.dataflow.TaintTracking
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import codeql.swift.dataflow.FlowSteps
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import codeql.swift.security.ConstantPasswordExtensions
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/**
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* A constant password is created through either a byte array or string literals.
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*/
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class ConstantPasswordSource extends Expr {
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ConstantPasswordSource() {
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this = any(ArrayExpr arr | arr.getType().getName() = "Array<UInt8>") or
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this instanceof StringLiteralExpr
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}
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}
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/**
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* A class for all ways to use a constant password.
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*/
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class ConstantPasswordSink extends Expr {
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ConstantPasswordSink() {
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// `password` arg in `init` is a sink
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exists(ClassOrStructDecl c, ConstructorDecl f, CallExpr call |
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c.getName() = ["HKDF", "PBKDF1", "PBKDF2", "Scrypt"] and
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c.getAMember() = f and
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call.getStaticTarget() = f and
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call.getArgumentWithLabel("password").getExpr() = this
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)
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or
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// RNCryptor (labelled arguments)
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exists(ClassOrStructDecl c, MethodDecl f, CallExpr call |
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c.getName() = ["RNCryptor", "RNEncryptor", "RNDecryptor"] and
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c.getAMember() = f and
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call.getStaticTarget() = f and
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call.getArgumentWithLabel(["password", "withPassword", "forPassword"]).getExpr() = this
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)
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or
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// RNCryptor (unlabelled arguments)
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exists(MethodDecl f, CallExpr call |
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f.hasQualifiedName("RNCryptor", "keyForPassword(_:salt:settings:)") and
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call.getStaticTarget() = f and
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call.getArgument(0).getExpr() = this
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)
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}
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}
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/**
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* A taint configuration from the source of constants passwords to expressions that use
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* them to initialize password-based encryption keys.
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*/
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module ConstantPasswordConfig implements DataFlow::ConfigSig {
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predicate isSource(DataFlow::Node node) { node.asExpr() instanceof ConstantPasswordSource }
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predicate isSink(DataFlow::Node node) { node.asExpr() instanceof ConstantPasswordSink }
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}
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module ConstantPasswordFlow = TaintTracking::Global<ConstantPasswordConfig>;

‎swift/ql/lib/codeql/swift/security/ConstantSaltExtensions.qll‎

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/**
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* Provides classes and predicates for reasoning about use of constant salts
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* for password hashing.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow

‎swift/ql/lib/codeql/swift/security/ConstantSaltQuery.qll‎

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/**
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* Provides a taint tracking configuration to find use of constant salts
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* for password hashing.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow
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import codeql.swift.dataflow.TaintTracking
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import codeql.swift.dataflow.FlowSteps
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import codeql.swift.security.ConstantSaltExtensions
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/**
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* A constant salt is created through either a byte array or string literals.
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*/
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class ConstantSaltSource extends Expr {
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ConstantSaltSource() {
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this = any(ArrayExpr arr | arr.getType().getName() = "Array<UInt8>") or
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this instanceof StringLiteralExpr or
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this instanceof NumberLiteralExpr
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}
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}
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/**
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* A class for all ways to use a constant salt.
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*/
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class ConstantSaltSink extends Expr {
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ConstantSaltSink() {
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// `salt` arg in `init` is a sink
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exists(ClassOrStructDecl c, ConstructorDecl f, CallExpr call |
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c.getName() = ["HKDF", "PBKDF1", "PBKDF2", "Scrypt"] and
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c.getAMember() = f and
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call.getStaticTarget() = f and
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call.getArgumentWithLabel("salt").getExpr() = this
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)
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or
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// RNCryptor
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exists(ClassOrStructDecl c, MethodDecl f, CallExpr call |
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c.getName() = ["RNCryptor", "RNEncryptor", "RNDecryptor"] and
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c.getAMember() = f and
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call.getStaticTarget() = f and
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call.getArgumentWithLabel(["salt", "encryptionSalt", "hmacSalt", "HMACSalt"]).getExpr() = this
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)
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}
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}
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/**
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* A taint configuration from the source of constants salts to expressions that use
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* them to initialize password-based encryption keys.
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*/
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module ConstantSaltConfig implements DataFlow::ConfigSig {
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predicate isSource(DataFlow::Node node) { node.asExpr() instanceof ConstantSaltSource }
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predicate isSink(DataFlow::Node node) { node.asExpr() instanceof ConstantSaltSink }
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}
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module ConstantSaltFlow = TaintTracking::Global<ConstantSaltConfig>;

‎swift/ql/lib/codeql/swift/security/ECBEncryptionExtensions.qll‎

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/**
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* Provides classes and predicates for reasoning about encryption using the
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* ECB encrpytion mode.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow

‎swift/ql/lib/codeql/swift/security/ECBEncryptionQuery.qll‎

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/**
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* Provides a taint tracking configuration to find encryption using the
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* ECB encrpytion mode.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow
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import codeql.swift.dataflow.TaintTracking
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import codeql.swift.security.ECBEncryptionExtensions
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/**
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* An `Expr` that is used to initialize the block mode of a cipher.
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*/
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abstract class BlockMode extends Expr { }
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/**
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* An `Expr` that is used to form an `AES` cipher.
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*/
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class AES extends BlockMode {
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AES() {
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// `blockMode` arg in `AES.init` is a sink
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exists(CallExpr call |
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call.getStaticTarget()
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.(MethodDecl)
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.hasQualifiedName("AES", ["init(key:blockMode:)", "init(key:blockMode:padding:)"]) and
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call.getArgument(1).getExpr() = this
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)
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}
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}
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/**
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* An `Expr` that is used to form a `Blowfish` cipher.
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*/
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class Blowfish extends BlockMode {
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Blowfish() {
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// `blockMode` arg in `Blowfish.init` is a sink
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exists(CallExpr call |
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call.getStaticTarget()
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.(MethodDecl)
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.hasQualifiedName("Blowfish", "init(key:blockMode:padding:)") and
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call.getArgument(1).getExpr() = this
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)
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}
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}
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/**
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* A taint configuration from the constructor of ECB mode to expressions that use
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* it to initialize a cipher.
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*/
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module EcbEncryptionConfig implements DataFlow::ConfigSig {
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predicate isSource(DataFlow::Node node) {
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exists(CallExpr call |
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call.getStaticTarget().(MethodDecl).hasQualifiedName("ECB", "init()") and
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node.asExpr() = call
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)
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}
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predicate isSink(DataFlow::Node node) { node.asExpr() instanceof BlockMode }
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}
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module EcbEncryptionFlow = DataFlow::Global<EcbEncryptionConfig>;

‎swift/ql/lib/codeql/swift/security/HardcodedEncryptionKeyExtensions.qll‎

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/**
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* Provides classes and predicates for reasoning about hard-coded encryption
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* key vulnerabilities.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow

‎swift/ql/lib/codeql/swift/security/HardcodedEncryptionKeyQuery.qll‎

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/**
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* Provides a taint tracking configuration to find hard-coded encryption
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* key vulnerabilities.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow
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import codeql.swift.dataflow.TaintTracking
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import codeql.swift.security.HardcodedEncryptionKeyExtensions
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/**
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* An `Expr` that is used to initialize a key.
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*/
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abstract class KeySource extends Expr { }
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/**
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* A literal byte array is a key source.
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*/
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class ByteArrayLiteralSource extends KeySource {
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ByteArrayLiteralSource() { this = any(ArrayExpr arr | arr.getType().getName() = "Array<UInt8>") }
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}
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/**
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* A string literal is a key source.
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*/
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class StringLiteralSource extends KeySource instanceof StringLiteralExpr { }
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/**
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* A class for all ways to set a key.
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*/
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class EncryptionKeySink extends Expr {
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EncryptionKeySink() {
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// `key` arg in `init` is a sink
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exists(CallExpr call, string fName |
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call.getStaticTarget()
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.(MethodDecl)
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.hasQualifiedName([
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"AES", "HMAC", "ChaCha20", "CBCMAC", "CMAC", "Poly1305", "Blowfish", "Rabbit"
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], fName) and
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fName.matches("init(key:%") and
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call.getArgument(0).getExpr() = this
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)
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or
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// RNCryptor
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exists(ClassOrStructDecl c, MethodDecl f, CallExpr call |
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c.getFullName() = ["RNCryptor", "RNEncryptor", "RNDecryptor"] and
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c.getAMember() = f and
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call.getStaticTarget() = f and
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call.getArgumentWithLabel(["encryptionKey", "withEncryptionKey"]).getExpr() = this
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)
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}
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}
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/**
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* A taint configuration from the key source to expressions that use
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* it to initialize a cipher.
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*/
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module HardcodedKeyConfig implements DataFlow::ConfigSig {
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predicate isSource(DataFlow::Node node) { node.asExpr() instanceof KeySource }
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predicate isSink(DataFlow::Node node) { node.asExpr() instanceof EncryptionKeySink }
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}
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module HardcodedKeyFlow = TaintTracking::Global<HardcodedKeyConfig>;

‎swift/ql/lib/codeql/swift/security/InsecureTLSExtensions.qll‎

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/**
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* Provides classes and predicates for reasoning about insecure TLS
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* configurations.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow

‎swift/ql/lib/codeql/swift/security/InsecureTLSQuery.qll‎

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/**
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* Provides a taint tracking configuration to find insecure TLS
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* configurations.
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*/
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import swift
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import codeql.swift.dataflow.DataFlow
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import codeql.swift.dataflow.TaintTracking
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import codeql.swift.dataflow.FlowSources
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import codeql.swift.security.InsecureTLSExtensions
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/**
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* A taint config to detect insecure configuration of `NSURLSessionConfiguration`
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*/
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module InsecureTlsConfig implements DataFlow::ConfigSig {
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/**
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* Holds for enum values that represent an insecure version of TLS
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*/
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predicate isSource(DataFlow::Node node) {
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node.asExpr().(MethodLookupExpr).getMember().(EnumElementDecl).getName() =
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["TLSv10", "TLSv11", "tlsProtocol10", "tlsProtocol11"]
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}
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/**
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* Holds for assignment of TLS-related properties of `NSURLSessionConfiguration`
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*/
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predicate isSink(DataFlow::Node node) {
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exists(AssignExpr assign |
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assign.getSource() = node.asExpr() and
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assign.getDest().(MemberRefExpr).getMember().(ConcreteVarDecl).getName() =
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[
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"tlsMinimumSupportedProtocolVersion", "tlsMinimumSupportedProtocol",
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"tlsMaximumSupportedProtocolVersion", "tlsMaximumSupportedProtocol"
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]
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)
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}
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}
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module InsecureTlsFlow = TaintTracking::Global<InsecureTlsConfig>;

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