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Android Secure Coding Standard
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Java Coding Language

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Applicable to Android (Java Rules/Recomendations)

Created by Barbara White, last updated by Sandy Shrum on May 07, 2015 1 minute read

Rules

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DCL00-J. Prevent class initialization cycles
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DCL01-J. Do not reuse public identifiers from the Java Standard Library
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DCL02-J. Do not modify the collection's elements during an enhanced for statement
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ERR00-J. Do not suppress or ignore checked exceptions
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ERR01-J. Do not allow exceptions to expose sensitive information
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ERR02-J. Prevent exceptions while logging data
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ERR03-J. Restore prior object state on method failure
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ERR04-J. Do not complete abruptly from a finally block
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ERR05-J. Do not let checked exceptions escape from a finally block
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ERR06-J. Do not throw undeclared checked exceptions
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ERR07-J. Do not throw RuntimeException, Exception, or Throwable
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ERR08-J. Do not catch NullPointerException or any of its ancestors
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EXP00-J. Do not ignore values returned by methods
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EXP02-J. Do not use the Object.equals() method to compare two arrays
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FIO02-J. Detect and handle file-related errors
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FIO03-J. Remove temporary files before termination
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FIO05-J. Do not expose buffers or their backing arrays methods to untrusted code
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FIO07-J. Do not let external processes block on IO buffers
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FIO09-J. Do not rely on the write() method to output integers outside the range 0 to 255
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FIO10-J. Ensure the array is filled when using read() to fill an array
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FIO12-J. Provide methods to read and write little-endian data
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IDS03-J. Do not log unsanitized user input
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IDS06-J. Exclude unsanitized user input from format strings
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IDS08-J. Sanitize untrusted data included in a regular expression
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IDS11-J. Perform any string modifications before validation
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JNI00-J. Define wrappers around native methods
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JNI02-J. Do not assume object references are constant or unique
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JNI04-J. Do not assume that Java strings are null-terminated
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LCK01-J. Do not synchronize on objects that may be reused
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LCK02-J. Do not synchronize on the class object returned by getClass()
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LCK03-J. Do not synchronize on the intrinsic locks of high-level concurrency objects
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LCK04-J. Do not synchronize on a collection view if the backing collection is accessible
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LCK06-J. Do not use an instance lock to protect shared static data
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LCK07-J. Avoid deadlock by requesting and releasing locks in the same order
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LCK08-J. Ensure actively held locks are released on exceptional conditions
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LCK09-J. Do not perform operations that can block while holding a lock
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LCK10-J. Use a correct form of the double-checked locking idiom
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MET00-J. Validate method arguments
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MET04-J. Do not increase the accessibility of overridden or hidden methods
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MET05-J. Ensure that constructors do not call overridable methods
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MET06-J. Do not invoke overridable methods in clone()
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MET07-J. Never declare a class method that hides a method declared in a superclass or superinterface
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MET08-J. Preserve the equality contract when overriding the equals() method
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MET09-J. Classes that define an equals() method must also define a hashCode() method
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MET10-J. Follow the general contract when implementing the compareTo() method
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MET11-J. Ensure that keys used in comparison operations are immutable
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MET12-J. Do not use finalizers
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MSC00-J. Use SSLSocket rather than Socket for secure data exchange
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MSC01-J. Do not use an empty infinite loop
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MSC02-J. Generate strong random numbers
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MSC04-J. Do not leak memory
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MSC05-J. Do not exhaust heap space
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MSC06-J. Do not modify the underlying collection when an iteration is in progress
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MSC07-J. Prevent multiple instantiations of singleton objects
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NUM01-J. Do not perform bitwise and arithmetic operations on the same data
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NUM02-J. Ensure that division and remainder operations do not result in divide-by-zero errors
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NUM03-J. Use integer types that can fully represent the possible range of unsigned data
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NUM07-J. Do not attempt comparisons with NaN
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NUM08-J. Check floating-point inputs for exceptional values
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NUM09-J. Do not use floating-point variables as loop counters
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NUM10-J. Do not construct BigDecimal objects from floating-point literals
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NUM12-J. Ensure conversions of numeric types to narrower types do not result in lost or misinterpreted data
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NUM13-J. Avoid loss of precision when converting primitive integers to floating-point
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OBJ01-J. Limit accessibility of fields
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OBJ02-J. Preserve dependencies in subclasses when changing superclasses
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OBJ04-J. Provide mutable classes with copy functionality to safely allow passing instances to untrusted code
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OBJ05-J. Do not return references to private mutable class members
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OBJ06-J. Defensively copy mutable inputs and mutable internal components
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OBJ07-J. Sensitive classes must not let themselves be copied
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OBJ08-J. Do not expose private members of an outer class from within a nested class
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OBJ09-J. Compare classes and not class names
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OBJ10-J. Do not use public static nonfinal fields
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OBJ11-J. Be wary of letting constructors throw exceptions
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SER00-J. Enable serialization compatibility during class evolution
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SER01-J. Do not deviate from the proper signatures of serialization methods
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SER02-J. Sign then seal objects before sending them outside a trust boundary
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SER03-J. Do not serialize unencrypted sensitive data
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SER05-J. Do not serialize instances of inner classes
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SER06-J. Make defensive copies of private mutable components during deserialization
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SER07-J. Do not use the default serialized form for classes with implementation-defined invariants
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SER08-J. Minimize privileges before deserializing from a privileged context
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SER09-J. Do not invoke overridable methods from the readObject() method
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SER10-J. Avoid memory and resource leaks during serialization
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SER11-J. Prevent overwriting of externalizable objects
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STR03-J. Do not encode noncharacter data as a string
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THI01-J. Do not invoke ThreadGroup methods
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TSM03-J. Do not publish partially initialized objects
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VNA00-J. Ensure visibility when accessing shared primitive variables
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VNA01-J. Ensure visibility of shared references to immutable objects
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VNA02-J. Ensure that compound operations on shared variables are atomic
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VNA03-J. Do not assume that a group of calls to independently atomic methods is atomic
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VNA04-J. Ensure that calls to chained methods are atomic
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VNA05-J. Ensure atomicity when reading and writing 64-bit values

Recommendations

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CON50-J. Do not assume that declaring a reference volatile guarantees safe publication of the members of the referenced object
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CON51-J. Do not assume that the sleep(), yield(), or getState() methods provide synchronization semantics
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CON52-J. Document thread-safety and use annotations where applicable
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DCL50-J. Use visually distinct identifiers
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DCL51-J. Do not shadow or obscure identifiers in subscopes
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DCL52-J. Do not declare more than one variable per declaration
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DCL53-J. Minimize the scope of variables
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DCL54-J. Use meaningful symbolic constants to represent literal values in program logic
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DCL55-J. Properly encode relationships in constant definitions
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DCL56-J. Do not attach significance to the ordinal associated with an enum
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DCL57-J. Avoid ambiguous overloading of variable arity methods
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DCL58-J. Enable compile-time type checking of variable arity parameter types
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DCL59-J. Do not apply public final to constants whose value might change in later releases
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DCL60-J. Avoid cyclic dependencies between packages
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ERR50-J. Use exceptions only for exceptional conditions
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ERR51-J. Prefer user-defined exceptions over more general exception types
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ERR52-J. Avoid in-band error indicators
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ERR53-J. Try to gracefully recover from system errors
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EXP50-J. Do not confuse abstract object equality with reference equality
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EXP51-J. Do not perform assignments in conditional expressions
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EXP52-J. Use braces for the body of an if, for, or while statement
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EXP53-J. Use parentheses for precedence of operation
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EXP54-J. Understand the differences between bitwise and logical operators
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EXP55-J. Use the same type for the second and third operands in conditional expressions
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FIO52-J. Do not store unencrypted sensitive information on the client side
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FIO53-J. Use the serialization methods writeUnshared() and readUnshared() with care
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IDS53-J. Prevent XPath Injection
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IDS55-J. Understand how escape characters are interpreted when strings are loaded
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MET50-J. Avoid ambiguous or confusing uses of overloading
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MET51-J. Do not use overloaded methods to differentiate between runtime types
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MET52-J. Do not use the clone() method to copy untrusted method parameters
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MET53-J. Ensure that the clone() method calls super.clone()
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MET54-J. Always provide feedback about the resulting value of a method
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MET55-J. Return an empty array or collection instead of a null value for methods that return an array or collection
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MET56-J. Do not use Object.equals() to compare cryptographic keys
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MSC50-J. Minimize the scope of the @SuppressWarnings annotation
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MSC51-J. Do not place a semicolon immediately following an if, for, or while condition
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MSC52-J. Finish every set of statements associated with a case label with a break statement
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MSC53-J. Carefully design interfaces before releasing them
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MSC54-J. Avoid inadvertent wrapping of loop counters
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MSC55-J. Use comments consistently and in a readable fashion
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MSC56-J. Detect and remove superfluous code and values
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MSC57-J. Strive for logical completeness
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MSC58-J. Prefer using iterators over enumerations
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MSC61-J. Do not use insecure or weak cryptographic algorithms
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MSC62-J. Store passwords using a hash function
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MSC63-J. Ensure that SecureRandom is properly seeded
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NUM50-J. Convert integers to floating point for floating-point operations
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NUM51-J. Do not assume that the remainder operator always returns a nonnegative result for integral operands
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NUM52-J. Be aware of numeric promotion behavior
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NUM54-J. Do not use denormalized numbers
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OBJ50-J. Never confuse the immutability of a reference with that of the referenced object
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OBJ51-J. Minimize the accessibility of classes and their members
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OBJ52-J. Write garbage-collection-friendly code
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OBJ53-J. Do not use direct buffers for short-lived, infrequently used objects
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OBJ54-J. Do not attempt to help the garbage collector by setting local reference variables to null
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OBJ55-J. Remove short-lived objects from long-lived container objects
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OBJ57-J. Do not rely on methods that can be overridden by untrusted code
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OBJ58-J. Limit the extensibility of classes and methods with invariants
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SEC56-J. Do not serialize direct handles to system resources

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