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# File 'lib/rules/dangerous_triggers.rb', line 7
def check(workflow)
findings = []
triggers = workflow.triggers
has_prt = case triggers
when Hash then triggers.key?("pull_request_target")
when Array then triggers.include?("pull_request_target")
when String then triggers == "pull_request_target"
else false
end
return findings unless has_prt
workflow.jobs.each do |_job_id, job|
workflow.steps(job).each do |step|
next unless step["uses"]&.include?("checkout")
with = step["with"] || {}
ref = with["ref"]&.to_s || ""
if ref.match?(/\bgithub\.event\.pull_request\.head\b|\.head_ref\b|pull_request\.head\.sha/i) ||
ref.match?(/\$\{\{\s*github\.head_ref\s*\}\}/)
line = workflow.line_of(/ref:.*head/i) || workflow.line_of(/checkout/)
findings << finding(workflow,
line: line || 0,
code: "ref: #{ref}",
message: "pull_request_target + checkout of PR head — fork code runs with base repo secrets",
fix: "Use pull_request trigger instead, or don't checkout PR head code"
)
end
end
end
findings
end
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