435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
package jwt
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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)
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// Implements the RSA family of signing methods signing methods
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// Expects *rsa.PrivateKey for signing and *rsa.PublicKey for validation
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type SigningMethodRSA struct {
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Name string
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Hash crypto.Hash
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}
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// Specific instances for RS256 and company
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var (
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SigningMethodRS256 *SigningMethodRSA
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SigningMethodRS384 *SigningMethodRSA
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SigningMethodRS512 *SigningMethodRSA
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)
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func init() {
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// RS256
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SigningMethodRS256 = &SigningMethodRSA{"RS256", crypto.SHA256}
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RegisterSigningMethod(SigningMethodRS256.Alg(), func() SigningMethod {
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return SigningMethodRS256
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})
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// RS384
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SigningMethodRS384 = &SigningMethodRSA{"RS384", crypto.SHA384}
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RegisterSigningMethod(SigningMethodRS384.Alg(), func() SigningMethod {
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return SigningMethodRS384
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})
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// RS512
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SigningMethodRS512 = &SigningMethodRSA{"RS512", crypto.SHA512}
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RegisterSigningMethod(SigningMethodRS512.Alg(), func() SigningMethod {
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return SigningMethodRS512
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})
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}
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func (m *SigningMethodRSA) Alg() string {
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return m.Name
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}
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// Implements the Verify method from SigningMethod
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// For this signing method, must be an *rsa.PublicKey structure.
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func (m *SigningMethodRSA) Verify(signingString, signature string, key interface{}) error {
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var err error
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// Decode the signature
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var sig []byte
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if sig, err = DecodeSegment(signature); err != nil {
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return err
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}
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var rsaKey *rsa.PublicKey
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var ok bool
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if rsaKey, ok = key.(*rsa.PublicKey); !ok {
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return ErrInvalidKeyType
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}
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// Create hasher
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if !m.Hash.Available() {
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return ErrHashUnavailable
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}
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hasher := m.Hash.New()
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hasher.Write([]byte(signingString))
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// Verify the signature
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return rsa.VerifyPKCS1v15(rsaKey, m.Hash, hasher.Sum(nil), sig)
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}
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// Implements the Sign method from SigningMethod
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// For this signing method, must be an *rsa.PrivateKey structure.
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func (m *SigningMethodRSA) Sign(signingString string, key interface{}) (string, error) {
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var rsaKey *rsa.PrivateKey
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var ok bool
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// Validate type of key
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if rsaKey, ok = key.(*rsa.PrivateKey); !ok {
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return "", ErrInvalidKey
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}
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// Create the hasher
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if !m.Hash.Available() {
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return "", ErrHashUnavailable
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}
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hasher := m.Hash.New()
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hasher.Write([]byte(signingString))
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// Sign the string and return the encoded bytes
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if sigBytes, err := rsa.SignPKCS1v15(rand.Reader, rsaKey, m.Hash, hasher.Sum(nil)); err == nil {
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return EncodeSegment(sigBytes), nil
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} else {
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return "", err
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}
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}
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