49 lines
1.4 KiB
Go
49 lines
1.4 KiB
Go
package rules
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import (
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"go/ast"
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"go/token"
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"strings"
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)
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// The web/mw CORS convention: mw.CORS uses exact-origin matching and rejects "*"
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// at construction (panic). Passing "*" is the trap this rule catches before runtime —
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// allow-all is done with mw.CORSAllowAll(), gated by env in application code.
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func init() {
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registered = append(registered,
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Rule{
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ID: "cors.wildcard-noop",
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Severity: SeverityError,
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Module: "web",
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Check: checkCORSWildcard,
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},
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)
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}
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// checkCORSWildcard flags any call to <pkg>.CORS(...) whose arguments contain a
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// "*" string literal — which mw.CORS rejects (panics) at boot.
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func checkCORSWildcard(c *Context) []Finding {
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var hits []Finding
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ast.Inspect(c.File, func(n ast.Node) bool {
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call, ok := n.(*ast.CallExpr)
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if !ok || !strings.HasSuffix(exprName(call.Fun), ".CORS") {
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return true
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}
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for _, arg := range call.Args {
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ast.Inspect(arg, func(m ast.Node) bool {
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lit, ok := m.(*ast.BasicLit)
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if ok && lit.Kind == token.STRING && strings.Trim(lit.Value, `"`) == "*" {
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hits = append(hits, Finding{
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Message: `mw.CORS with "*" panics at construction — "*" matches no real origin (exact-match only)`,
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Hint: "Use mw.CORSAllowAll() for local development, or list explicit origins.",
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Line: c.Fset.Position(call.Pos()).Line,
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})
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}
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return true
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})
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}
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return true
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})
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return hits
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}
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