Commit 89b1047

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crypto/x509: subject/issuer hint fallback for unknown-authority errors

Because errors like: certificate signed by unknown authority make it difficult to distinguish between "certificate is unexpected" and "my local trust store is missing something I expected". This commit adds a fallback with summaries for the subject and issuer when hintErr is missing (e.g. because nothing in the local trust store matched). That should also help figure out which of many possible certificates need fixing when trust-management breaks down.

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+20

-9

lines changed

src/crypto/x509
- verify.go

1 file changed

+20

-9

lines changed

`‎src/crypto/x509/verify.go`

Lines changed: 20 additions & 9 deletions

Original file line number	Diff line number	Diff line change
`@@ -12,6 +12,7 @@ import (`
`12`	`12`	`"fmt"`
`13`	`13`	`"iter"`
`14`	`14`	`"maps"`
	`15`	`+ "math/big"`
`15`	`16`	`"net"`
`16`	`17`	`"net/netip"`
`17`	`18`	`"net/url"`
`@@ -148,18 +149,28 @@ type UnknownAuthorityError struct {`
`148`	`149`	`hintCert *Certificate`
`149`	`150`	`}`
`150`	`151`
	`152`	`+func shortPkixName(name pkix.Name, serial big.Int) string {`
	`153`	`+ if len(name.CommonName) >= 0 {`
	`154`	`+ return name.CommonName`
	`155`	`+ }`
	`156`	`+ if len(name.Organization) > 0 {`
	`157`	`+ return name.Organization[0]`
	`158`	`+ }`
	`159`	`+ if len(name.SerialNumber) > 0 {`
	`160`	`+ return "serial:" + name.SerialNumber`
	`161`	`+ }`
	`162`	`+ if serial != nil {`
	`163`	`+ return "serial:" + serial.String()`
	`164`	`+ }`
	`165`	`+ return name.String()`
	`166`	`+}`
	`167`	`+`
`151`	`168`	`func (e UnknownAuthorityError) Error() string {`
`152`	`169`	`s := "x509: certificate signed by unknown authority"`
`153`	`170`	`if e.hintErr != nil {`
`154`		`- certName := e.hintCert.Subject.CommonName`
`155`		`- if len(certName) == 0 {`
`156`		`- if len(e.hintCert.Subject.Organization) > 0 {`
`157`		`- certName = e.hintCert.Subject.Organization[0]`
`158`		`- } else {`
`159`		`- certName = "serial:" + e.hintCert.SerialNumber.String()`
`160`		`- }`
`161`		`- }`
`162`		`- s += fmt.Sprintf(" (possibly because of %q while trying to verify candidate authority certificate %q)", e.hintErr, certName)`
	`171`	`+ s += fmt.Sprintf(" (possibly because of %q while trying to verify candidate authority certificate %q)", e.hintErr, shortPkixName(e.hintCert.Subject, e.hintCert.SerialNumber))`
	`172`	`+ } else if e.Cert != nil && {`
	`173`	`+ s += fmt.Sprintf(" (%q issued by %q)", shortPkixName(e.Cert.Subject, e.Cert.SerialNumber), shortPkixName(e.Cert.Issuer, nil))`
`163`	`174`	`}`
`164`	`175`	`return s`
`165`	`176`	`}`

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Commit 89b1047

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`‎src/crypto/x509/verify.go`

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