diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/ssh/certs.go')
| -rw-r--r-- | vendor/golang.org/x/crypto/ssh/certs.go | 93 |
1 files changed, 57 insertions, 36 deletions
diff --git a/vendor/golang.org/x/crypto/ssh/certs.go b/vendor/golang.org/x/crypto/ssh/certs.go index 6605bf64..a69e2249 100644 --- a/vendor/golang.org/x/crypto/ssh/certs.go +++ b/vendor/golang.org/x/crypto/ssh/certs.go @@ -14,8 +14,10 @@ import ( "time" ) -// These constants from [PROTOCOL.certkeys] represent the key algorithm names -// for certificate types supported by this package. +// Certificate algorithm names from [PROTOCOL.certkeys]. These values can appear +// in Certificate.Type, PublicKey.Type, and ClientConfig.HostKeyAlgorithms. +// Unlike key algorithm names, these are not passed to AlgorithmSigner and don't +// appear in the Signature.Format field. const ( CertAlgoRSAv01 = "ssh-rsa-cert-v01@openssh.com" CertAlgoDSAv01 = "ssh-dss-cert-v01@openssh.com" @@ -25,14 +27,21 @@ const ( CertAlgoSKECDSA256v01 = "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" CertAlgoED25519v01 = "ssh-ed25519-cert-v01@openssh.com" CertAlgoSKED25519v01 = "sk-ssh-ed25519-cert-v01@openssh.com" + + // CertAlgoRSASHA256v01 and CertAlgoRSASHA512v01 can't appear as a + // Certificate.Type (or PublicKey.Type), but only in + // ClientConfig.HostKeyAlgorithms. + CertAlgoRSASHA256v01 = "rsa-sha2-256-cert-v01@openssh.com" + CertAlgoRSASHA512v01 = "rsa-sha2-512-cert-v01@openssh.com" ) -// These constants from [PROTOCOL.certkeys] represent additional signature -// algorithm names for certificate types supported by this package. const ( - CertSigAlgoRSAv01 = "ssh-rsa-cert-v01@openssh.com" - CertSigAlgoRSASHA2256v01 = "rsa-sha2-256-cert-v01@openssh.com" - CertSigAlgoRSASHA2512v01 = "rsa-sha2-512-cert-v01@openssh.com" + // Deprecated: use CertAlgoRSAv01. + CertSigAlgoRSAv01 = CertAlgoRSAv01 + // Deprecated: use CertAlgoRSASHA256v01. + CertSigAlgoRSASHA2256v01 = CertAlgoRSASHA256v01 + // Deprecated: use CertAlgoRSASHA512v01. + CertSigAlgoRSASHA2512v01 = CertAlgoRSASHA512v01 ) // Certificate types distinguish between host and user @@ -431,10 +440,14 @@ func (c *Certificate) SignCert(rand io.Reader, authority Signer) error { } c.SignatureKey = authority.PublicKey() - if v, ok := authority.(AlgorithmSigner); ok { - if v.PublicKey().Type() == KeyAlgoRSA { - authority = &rsaSigner{v, SigAlgoRSASHA2512} + // Default to KeyAlgoRSASHA512 for ssh-rsa signers. + if v, ok := authority.(AlgorithmSigner); ok && v.PublicKey().Type() == KeyAlgoRSA { + sig, err := v.SignWithAlgorithm(rand, c.bytesForSigning(), KeyAlgoRSASHA512) + if err != nil { + return err } + c.Signature = sig + return nil } sig, err := authority.Sign(rand, c.bytesForSigning()) @@ -445,32 +458,40 @@ func (c *Certificate) SignCert(rand io.Reader, authority Signer) error { return nil } -// certAlgoNames includes a mapping from signature algorithms to the -// corresponding certificate signature algorithm. When a key type (such -// as ED25516) is associated with only one algorithm, the KeyAlgo -// constant is used instead of the SigAlgo. -var certAlgoNames = map[string]string{ - SigAlgoRSA: CertSigAlgoRSAv01, - SigAlgoRSASHA2256: CertSigAlgoRSASHA2256v01, - SigAlgoRSASHA2512: CertSigAlgoRSASHA2512v01, - KeyAlgoDSA: CertAlgoDSAv01, - KeyAlgoECDSA256: CertAlgoECDSA256v01, - KeyAlgoECDSA384: CertAlgoECDSA384v01, - KeyAlgoECDSA521: CertAlgoECDSA521v01, - KeyAlgoSKECDSA256: CertAlgoSKECDSA256v01, - KeyAlgoED25519: CertAlgoED25519v01, - KeyAlgoSKED25519: CertAlgoSKED25519v01, +// certKeyAlgoNames is a mapping from known certificate algorithm names to the +// corresponding public key signature algorithm. +var certKeyAlgoNames = map[string]string{ + CertAlgoRSAv01: KeyAlgoRSA, + CertAlgoRSASHA256v01: KeyAlgoRSASHA256, + CertAlgoRSASHA512v01: KeyAlgoRSASHA512, + CertAlgoDSAv01: KeyAlgoDSA, + CertAlgoECDSA256v01: KeyAlgoECDSA256, + CertAlgoECDSA384v01: KeyAlgoECDSA384, + CertAlgoECDSA521v01: KeyAlgoECDSA521, + CertAlgoSKECDSA256v01: KeyAlgoSKECDSA256, + CertAlgoED25519v01: KeyAlgoED25519, + CertAlgoSKED25519v01: KeyAlgoSKED25519, +} + +// underlyingAlgo returns the signature algorithm associated with algo (which is +// an advertised or negotiated public key or host key algorithm). These are +// usually the same, except for certificate algorithms. +func underlyingAlgo(algo string) string { + if a, ok := certKeyAlgoNames[algo]; ok { + return a + } + return algo } -// certToPrivAlgo returns the underlying algorithm for a certificate algorithm. -// Panics if a non-certificate algorithm is passed. -func certToPrivAlgo(algo string) string { - for privAlgo, pubAlgo := range certAlgoNames { - if pubAlgo == algo { - return privAlgo +// certificateAlgo returns the certificate algorithms that uses the provided +// underlying signature algorithm. +func certificateAlgo(algo string) (certAlgo string, ok bool) { + for certName, algoName := range certKeyAlgoNames { + if algoName == algo { + return certName, true } } - panic("unknown cert algorithm") + return "", false } func (cert *Certificate) bytesForSigning() []byte { @@ -514,13 +535,13 @@ func (c *Certificate) Marshal() []byte { return result } -// Type returns the key name. It is part of the PublicKey interface. +// Type returns the certificate algorithm name. It is part of the PublicKey interface. func (c *Certificate) Type() string { - algo, ok := certAlgoNames[c.Key.Type()] + certName, ok := certificateAlgo(c.Key.Type()) if !ok { - panic("unknown cert key type " + c.Key.Type()) + panic("unknown certificate type for key type " + c.Key.Type()) } - return algo + return certName } // Verify verifies a signature against the certificate's public |