name: go
description: Sandbox policy for the Go module ecosystem (go command)
package_managers:
  - go

# go run executes the built program in the foreground and may need a TTY.
allow_pty: true

# Localhost-only listening (same as npx/uvx/pipx): go test commonly binds
# httptest servers, and go run workloads often serve locally. Non-localhost
# binds and outbound traffic are unaffected.
allow_network_bind: true

# All non-loopback outbound traffic is denied: only the PMG proxy's port is
# reachable, plus loopback-to-loopback connects since this profile sets
# allow_network_bind. Per-host control happens at the proxy; direct DNS is
# disabled (the proxy resolves). Requires the proxy flow; pmg fails closed
# if the proxy is not running.
network_via_proxy_only: true

# .git/config stays blocked (default). go build embeds VCS info by default
# (-buildvcs=auto) which invokes git; if git fails on the blocked config, build
# with -buildvcs=false or set allow_git_config: true in a custom profile.

filesystem:
  allow_read:
    # Root read is required for toolchain discovery: GOROOT can live anywhere
    # (/usr/local/go, Homebrew, distro packages, asdf, golang.org/dl SDKs).
    # This is safe because deny rules have higher precedence and dangerous
    # files (.env, .ssh, .aws, .gnupg, etc.) are blocked by mandatory deny
    # patterns.
    - /
    - ${CWD}/**
    - ${HOME}/go/**
    - ${HOME}/.config/go/**
    - ${HOME}/Library/Caches/go-build/**
    - ${HOME}/.cache/go-build/**

  allow_write:
    # Note: ${TMPDIR} is automatically allowed when write restrictions are enabled (macOS)
    # Note: On macOS, /tmp is a symlink to /private/tmp, so we need both
    - /tmp/**
    - /private/tmp/**
    - /var/tmp/**
    # go build/test write output binaries and generated files anywhere in the
    # project (e.g. go build -o bin/app). Unlike npm/PyPI, the Go ecosystem has
    # no install-time script execution: module code only runs via go run /
    # go test / go generate, and credential files inside the project stay
    # blocked by the mandatory deny patterns.
    - ${CWD}/**
    # Default GOPATH: module cache and sumdb cache (pkg/mod), go install
    # target (bin).
    - ${HOME}/go/**
    # Default GOCACHE build cache (macOS, Linux)
    - ${HOME}/Library/Caches/go-build/**
    - ${HOME}/.cache/go-build/**
    # Local telemetry counters written by the go tool on every invocation
    - ${HOME}/Library/Application Support/go/telemetry/**
    - ${HOME}/.config/go/telemetry/**

  deny_read: []

  deny_write:
    # Additional system directories to protect
    - /etc/**
    - /usr/**

network:
  # These hosts are documentation of the default Go module endpoints and the
  # future input to proxy-level per-host policy. They are NOT kernel-enforced:
  # with network_via_proxy_only, the sandbox denies all non-loopback outbound
  # traffic, and the proxy (with fail-closed GOPROXY rewrite) controls module
  # traffic.
  allow_outbound:
    - proxy.golang.org:443
    - sum.golang.org:443
    - index.golang.org:443

  deny_outbound:
    - "*:*"

environment:
  # Go toolchain variables (GOPROXY, GOFLAGS, CGO_*, CC, CXX) and the
  # PMG-injected proxy/cert variables are not on the DANGEROUS_ENV_VARS scrub
  # list, so they pass through without an allow entry. Deliberately no GO*
  # re-allow here: that glob would also re-allow GOOGLE_* cloud credentials,
  # which must stay scrubbed.
  allow: []

process:
  allow_exec:
    # Go toolchain: official installer, distro packages, Homebrew
    - /usr/local/go/**
    - /usr/local/bin/go
    - /usr/bin/go
    - /usr/lib/go*/**
    - /opt/homebrew/bin/go
    - /opt/homebrew/Cellar/go/**
    # golang.org/dl SDKs and version manager shims
    - ${HOME}/sdk/go*/**
    - ${HOME}/.asdf/shims/go
    # Toolchains downloaded via GOTOOLCHAIN are exec'd from the module cache
    - ${HOME}/go/pkg/mod/golang.org/toolchain@*/**
    # go run / go test execute freshly built binaries from the build cache and
    # the per-build temp work directory
    - ${HOME}/Library/Caches/go-build/**
    - ${HOME}/.cache/go-build/**
    - /tmp/**
    - ${TMPDIR}/**
    # cgo toolchain and VCS stamping (-buildvcs)
    - /usr/bin/gcc
    - /usr/bin/clang
    - /usr/bin/cc
    - /usr/bin/git
    - /usr/local/bin/git
    # Required for shims (e.g., asdf) that use #!/usr/bin/env bash
    - /bin/bash
    - /bin/sh
    - /usr/bin/env

  deny_exec:
    - /usr/bin/curl
    - /usr/bin/wget