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feat(launcher): Add checking of files with expired authenticode sigs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| package umbra | ||
|
|
||
| import ( | ||
| "crypto/x509" | ||
| _ "embed" | ||
| "encoding/pem" | ||
| "fmt" | ||
| "os" | ||
| "sync" | ||
|
|
||
| "github.com/saferwall/pe" | ||
| "go.mozilla.org/pkcs7" | ||
| ) | ||
|
|
||
| //go:embed certs.pem | ||
| var certs []byte | ||
|
|
||
| var certPoolOnce = sync.OnceValue(func() *x509.CertPool { | ||
| cp := x509.NewCertPool() | ||
|
|
||
| var pemBlock *pem.Block | ||
| rest := certs | ||
|
|
||
| for { | ||
| pemBlock, rest = pem.Decode(rest) | ||
| if pemBlock == nil { | ||
| break | ||
| } | ||
| cert, err := x509.ParseCertificate(pemBlock.Bytes) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| cp.AddCert(cert) | ||
| } | ||
|
|
||
| return cp | ||
| }) | ||
|
|
||
| func verifyAuthenticode(bytes []byte) error { | ||
| // Need to enable SHA1 signatures for compatibility | ||
| // Obviously not good, but it's better than the alternative of verifying nothing | ||
| if err := os.Setenv("GODEBUG", "x509sha1=1"); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Would be preferable to use p.New where it mmaps the given file path | ||
| // but building the full path wouldn't be necessarily confined to the afero.Fs | ||
| pe, err := pe.NewBytes(bytes, &pe.Options{ | ||
| DisableCertValidation: true, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if err := pe.Parse(); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if len(pe.Certificates.Certificates) == 0 { | ||
| return fmt.Errorf("no certificates found") | ||
| } | ||
|
|
||
| pkcs7, err := pkcs7.Parse(pe.Certificates.Raw) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if err := pkcs7.VerifyWithChainAtTime(certPoolOnce(), pe.Certificates.Certificates[0].Info.NotAfter); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if !pe.Certificates.Certificates[0].SignatureValid { | ||
| return fmt.Errorf("signature invalid") | ||
| } | ||
|
|
||
| return nil | ||
| } |
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