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golang binary build code-obfuscator obfuscation

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Daniel Martí 4e79bfc01a warn when a public package imports a private package (#182 ) That is, a package that is built without obfuscation imports an obfuscated package. This will result in confusing compilation error messages, because the importer can't find the exported names from the imported package by their non-obfuscated names: > ! garble build ./importer [stderr] # test/main/importer importer/importer.go:5:9: undefined: imported.Name exit status 2 Instead, detect this bad input case and provide a nice error: public package "test/main/importer" can't depend on obfuscated package "test/main/imported" (matched via GOPRIVATE="test/main/imported") For now, this is by design. It also makes little sense for a public package to import an obfuscated package in general, because the public package would have to leak details about the private package's API and behavior. While at it, fix a quirk where we thought the unsafe package could be private. It can't be, because the runtime package is always public and it imports the runtime package: public package "internal/bytealg" can't depend on obfuscated package "unsafe" (matched via GOPRIVATE="*") Instead of trying to obfuscate "unsafe" and doing nothing, simply add it to the neverPrivate list, which is also a better name than "privateBlacklist" (for #169). Fixes #164. Co-authored-by: lu4p <lu4p@pm.me>		4 years ago
.github	CI: comment out test-gotip for now (#157 )	5 years ago
internal	Remove the `usesUnsafe` global variable as it's unused	4 years ago
scripts	set up an AUTHORS file to attribute copyright	5 years ago
testdata	warn when a public package imports a private package (#182 )	4 years ago
.gitattributes	start testing on GitHub Actions	5 years ago
.gitignore	skip literals used in constant expressions	5 years ago
AUTHORS	set up an AUTHORS file to attribute copyright	5 years ago
CONTRIBUTING.md	CONTRIBUTING: clarify that tests are required (#138 )	5 years ago
LICENSE	set up an AUTHORS file to attribute copyright	5 years ago
README.md	Allow struct fields to be garbled, fixes #48 (#159 )	5 years ago
bench_test.go	set up an AUTHORS file to attribute copyright	5 years ago
go.mod	Store obfuscated sources in object files (#158 )	5 years ago
go.sum	Store obfuscated sources in object files (#158 )	5 years ago
import_obfuscation.go	Hash identical package names from different package paths differently (#172 )	4 years ago
line_obfuscator.go	More correct comments transformation (#152 )	5 years ago
main.go	warn when a public package imports a private package (#182 )	4 years ago
main_test.go	Replaced asthelper.Ident with ast.NewIdent	4 years ago
runtime_strip.go	Replaced asthelper.Ident with ast.NewIdent	4 years ago

README.md

garble

GO111MODULE=on go get mvdan.cc/garble

Obfuscate Go code by wrapping the Go toolchain. Requires Go 1.15 or later, since Go 1.14 uses an entirely different object format.

garble build [build flags] [packages]

See garble -h for up to date usage information.

Purpose

Produce a binary that works as well as a regular build, but that has as little information about the original source code as possible.

The tool is designed to be:

Coupled with cmd/go, to support modules and build caching
Deterministic and reproducible, given the same initial source code
Reversible given the original source, to un-garble panic stack traces

Mechanism

The tool wraps calls to the Go compiler and linker to transform the Go build, in order to:

Replace as many useful identifiers as possible with short base64 hashes
Replace package paths with short base64 hashes
Remove all build and module information
Strip filenames and shuffle position information
Strip debugging information and symbol tables
Obfuscate literals, if the -literals flag is given
Removes extra information if the -tiny flag is given

Options

By default, the tool garbles the packages under the current module. If not running in module mode, then only the main package is garbled. To specify what packages to garble, set GOPRIVATE, documented at go help module-private.

Caveats

Most of these can improve with time and effort. The purpose of this section is to document the current shortcomings of this tool.

Exported methods are never garbled at the moment, since they could be required by interfaces and reflection. This area is a work in progress.
Functions implemented outside Go, such as assembly, aren't garbled since we currently only transform the input Go source.
Go plugins are not currently supported; see #87.

Tiny Mode

When the -tiny flag is passed, extra information is stripped from the resulting Go binary. This includes line numbers, filenames, and code in the runtime the prints panics, fatal errors, and trace/debug info. All in all this can make binaries 6-10% smaller in our testing.

Note: if -tiny is passed, no panics, fatal errors will ever be printed, but they can still be handled internally with recover as normal. In addition, the GODEBUG environmental variable will be ignored.