# Go Security
# Detects shell command execution via exec.Command(..., "-c"|"/c", ...).
id: go-command-injection
name: Command Injection Sink
severity: error
category: security
defect_class: injection
inline_tier: blocking
language: go

message: "Potential command injection sink — avoid shell command composition with user input"

description: |
  Using exec.Command with a shell (`sh -c`, `bash -c`, `cmd /c`) executes command strings.

  ✅ FIX: invoke binaries directly with explicit argument arrays and strict allowlists.

query: |
  (call_expression
    function: (selector_expression
      operand: (identifier) @PKG
      field: (field_identifier) @FN)
    arguments: (argument_list
      (interpreted_string_literal) @SHELL
      (interpreted_string_literal) @FLAG
      (_) @CMD)
    (#eq? @PKG "exec")
    (#match? @FN "^(Command|CommandContext)$")
    (#match? @SHELL "^\"(sh|bash|zsh|cmd|powershell|pwsh)\"$")
    (#match? @FLAG "^\"(-c|/c)\"$"))

metavars:
  - PKG
  - FN
  - SHELL
  - FLAG
  - CMD

post_filter: go_command_injection_sink

has_fix: false

tags:
  - go
  - security
  - command-injection
  - cwe-78
  - owasp-a03

examples:
  bad: |
    exec.Command("sh", "-c", userInput)

  good: |
    exec.Command("git", "status")