jwt

package module
v0.0.0-...-d42ca00 Latest Latest
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 Go to latest Published: Feb 5, 2023 License: MIT Imports: 21 Imported by: 0

Documentation

Overview

Package jwt is a Go implementation of JSON Web Tokens: http://self-issued.info/docs/draft-jones-json-web-token.html

See README.md for more info.

Index

Constants

View Source 
const (
	ValidationErrorMalformed        uint32 = 1 << iota // Token is malformed
	ValidationErrorUnverifiable                        // Token could not be verified because of signing problems
	ValidationErrorSignatureInvalid                    // Signature validation failed

	// Standard Claim validation errors
	ValidationErrorAudience      // AUD validation failed
	ValidationErrorExpired       // EXP validation failed
	ValidationErrorIssuedAt      // IAT validation failed
	ValidationErrorIssuer        // ISS validation failed
	ValidationErrorNotValidYet   // NBF validation failed
	ValidationErrorId            // JTI validation failed
	ValidationErrorClaimsInvalid // Generic claims validation error
)

The errors that might occur when parsing and validating a token

View Source 
const UnsafeAllowNoneSignatureType unsafeNoneMagicConstant = "none signing method allowed"

Variables

View Source 
var (
	ErrNotECPublicKey  = errors.New("key is not a valid ECDSA public key")
	ErrNotECPrivateKey = errors.New("key is not a valid ECDSA private key")
)
View Source 
var (
	ErrNotEdPrivateKey = errors.New("key is not a valid Ed25519 private key")
	ErrNotEdPublicKey  = errors.New("key is not a valid Ed25519 public key")
)
View Source 
var (
	ErrInvalidKey      = errors.New("key is invalid")
	ErrInvalidKeyType  = errors.New("key is of invalid type")
	ErrHashUnavailable = errors.New("the requested hash function is unavailable")

	ErrTokenMalformed        = errors.New("token is malformed")
	ErrTokenUnverifiable     = errors.New("token is unverifiable")
	ErrTokenSignatureInvalid = errors.New("token signature is invalid")

	ErrTokenInvalidAudience  = errors.New("token has invalid audience")
	ErrTokenExpired          = errors.New("token is expired")
	ErrTokenUsedBeforeIssued = errors.New("token used before issued")
	ErrTokenInvalidIssuer    = errors.New("token has invalid issuer")
	ErrTokenNotValidYet      = errors.New("token is not valid yet")
	ErrTokenInvalidId        = errors.New("token has invalid id")
	ErrTokenInvalidClaims    = errors.New("token has invalid claims")
)

Error constants

View Source 
var (
	ErrKeyMustBePEMEncoded = errors.New("invalid key: Key must be a PEM encoded PKCS1 or PKCS8 key")
	ErrNotRSAPrivateKey    = errors.New("key is not a valid RSA private key")
	ErrNotRSAPublicKey     = errors.New("key is not a valid RSA public key")
)
View Source 
var (
	// Sadly this is missing from crypto/ecdsa compared to crypto/rsa
	ErrECDSAVerification = errors.New("crypto/ecdsa: verification error")
)
View Source 
var (
	ErrEd25519Verification = errors.New("ed25519: verification error")
)
View Source 
var MarshalSingleStringAsArray = true

MarshalSingleStringAsArray modifies the behaviour of the ClaimStrings type, especially its MarshalJSON function.

If it is set to true (the default), it will always serialize the type as an array of strings, even if it just contains one element, defaulting to the behaviour of the underlying []string. If it is set to false, it will serialize to a single string, if it contains one element. Otherwise, it will serialize to an array of strings.

View Source 
var NoneSignatureTypeDisallowedError error
View Source 
var SigningMethodNone *signingMethodNone

SigningMethodNone implements the none signing method. This is required by the spec, but you probably should never use it.

View Source 
var TimeFunc = time.Now

TimeFunc provides the current time when parsing token to validate "exp" claim (expiration time). You can override it to use another time value. This is useful for testing or if your server uses a different time zone than your tokens.

View Source 
var TimePrecision = time.Second

TimePrecision sets the precision of times and dates within this library. This has an influence on the precision of times when comparing expiry or other related time fields. Furthermore, it is also the precision of times when serializing.

For backwards compatibility the default precision is set to seconds, so that no fractional timestamps are generated.

Functions

func GetAlgorithms 

func GetAlgorithms() (algs []string)

GetAlgorithms returns a list of registered "alg" names

func ParseECPrivateKeyFromPEM 

func ParseECPrivateKeyFromPEM(key []byte) (*ecdsa.PrivateKey, error)

ParseECPrivateKeyFromPEM parses a PEM encoded Elliptic Curve Private Key Structure

func ParseECPublicKeyFromPEM 

func ParseECPublicKeyFromPEM(key []byte) (*ecdsa.PublicKey, error)

ParseECPublicKeyFromPEM parses a PEM encoded PKCS1 or PKCS8 public key

func ParseEdPrivateKeyFromPEM 

func ParseEdPrivateKeyFromPEM(key []byte) (crypto.PrivateKey, error)

ParseEdPrivateKeyFromPEM parses a PEM-encoded Edwards curve private key

func ParseEdPublicKeyFromPEM 

func ParseEdPublicKeyFromPEM(key []byte) (crypto.PublicKey, error)

ParseEdPublicKeyFromPEM parses a PEM-encoded Edwards curve public key

func ParseRSAPrivateKeyFromPEM 

func ParseRSAPrivateKeyFromPEM(key []byte) (*rsa.PrivateKey, error)

ParseRSAPrivateKeyFromPEM parses a PEM encoded PKCS1 or PKCS8 private key

func ParseRSAPrivateKeyFromPEMWithPassword deprecated 

func ParseRSAPrivateKeyFromPEMWithPassword(key []byte, password string) (*rsa.PrivateKey, error)

ParseRSAPrivateKeyFromPEMWithPassword parses a PEM encoded PKCS1 or PKCS8 private key protected with password

Deprecated: This function is deprecated and should not be used anymore. It uses the deprecated x509.DecryptPEMBlock function, which has deprecated since RFC 1423 is regarded as insecure by design. Unfortunately, there is no alternative in the Go standard library for now.

func ParseRSAPublicKeyFromPEM 

func ParseRSAPublicKeyFromPEM(key []byte) (*rsa.PublicKey, error)

ParseRSAPublicKeyFromPEM parses a PEM encoded PKCS1 or PKCS8 public key

func RegisterSigningMethod 

func RegisterSigningMethod(alg string, f func() SigningMethod)

RegisterSigningMethod registers the "alg" name and a factory function for signing method. This is typically done during init() in the method's implementation

Types

type ClaimStrings 

type ClaimStrings []string

ClaimStrings is basically just a slice of strings, but it can be either serialized from a string array or just a string. This type is necessary, since the "aud" claim can either be a single string or an array.

func (ClaimStrings) MarshalJSON 

func (s ClaimStrings) MarshalJSON() (b []byte, err error)

func (*ClaimStrings) UnmarshalJSON 

func (s *ClaimStrings) UnmarshalJSON(data []byte) (err error)

type Claims 

type Claims interface {
	Valid() error
}

Claims must just have a Valid method that determines if the token is invalid for any supported reason

type Keyfunc 

type Keyfunc func(*Token) (interface{}, error)

Keyfunc will be used by the Parse methods as a callback function to supply the key for verification. The function receives the parsed, but unverified Token. This allows you to use properties in the Header of the token (such as `kid`) to identify which key to use.

type MapClaims 

type MapClaims map[string]interface{}

MapClaims is a claim type that uses the map[string]interface{} for JSON decoding. This is the default claims type if you don't supply one

func (MapClaims) Valid 

func (m MapClaims) Valid() error

Valid validates time-based claims "exp, iat, nbf". There is no accounting for clock skew. As well, if any of the above claims are not in the token, it will still be considered a valid claim.

func (MapClaims) VerifyAudience 

func (m MapClaims) VerifyAudience(cmp string, req bool) bool

VerifyAudience Compares the aud claim against cmp. If required is false, this method will return true if the value matches or is unset

func (MapClaims) VerifyExpiresAt 

func (m MapClaims) VerifyExpiresAt(cmp int64, req bool) bool

VerifyExpiresAt compares the exp claim against cmp (cmp <= exp). If req is false, it will return true, if exp is unset.

func (MapClaims) VerifyIssuedAt 

func (m MapClaims) VerifyIssuedAt(cmp int64, req bool) bool

VerifyIssuedAt compares the exp claim against cmp (cmp >= iat). If req is false, it will return true if iat is unset.

func (MapClaims) VerifyIssuer 

func (m MapClaims) VerifyIssuer(cmp string, req bool) bool

VerifyIssuer compares the iss claim against cmp. If required is false, this method will return true if the value matches or is unset

func (MapClaims) VerifyNotBefore 

func (m MapClaims) VerifyNotBefore(cmp int64, req bool) bool

VerifyNotBefore compares the nbf claim against cmp (cmp >= nbf). If req is false, it will return true if nbf is unset.

type NumericDate 

type NumericDate struct {
	time.Time
}

NumericDate represents a JSON numeric date value, as referenced at https://datatracker.ietf.org/doc/html/rfc7519#section-2.

func NewNumericDate 

func NewNumericDate(t time.Time) *NumericDate

NewNumericDate constructs a new *NumericDate from a standard library time.Time struct. It will truncate the timestamp according to the precision specified in TimePrecision.

func (NumericDate) MarshalJSON 

func (date NumericDate) MarshalJSON() (b []byte, err error)

MarshalJSON is an implementation of the json.RawMessage interface and serializes the UNIX epoch represented in NumericDate to a byte array, using the precision specified in TimePrecision.

func (*NumericDate) UnmarshalJSON 

func (date *NumericDate) UnmarshalJSON(b []byte) (err error)

UnmarshalJSON is an implementation of the json.RawMessage interface and deserializses a NumericDate from a JSON representation, i.e. a json.Number. This number represents an UNIX epoch with either integer or non-integer seconds.

type Parser 

type Parser struct {
	// contains filtered or unexported fields
}

func NewParser 

func NewParser(options ...ParserOption) *Parser

NewParser creates a new Parser with the specified options

func (*Parser) Parse 

func (p *Parser) Parse(tokenString string, keyFunc Keyfunc) (*Token, error)

Parse parses, validates, verifies the signature and returns the parsed token. keyFunc will receive the parsed token and should return the key for validating.

func (*Parser) ParseUnverified 

func (p *Parser) ParseUnverified(tokenString string, claims Claims) (token *Token, parts []string, err error)

ParseUnverified parses the token but doesn't validate the signature.

WARNING: Don't use this method unless you know what you're doing.

It's only ever useful in cases where you know the signature is valid (because it has been checked previously in the stack) and you want to extract values from it.

func (*Parser) ParseWithClaims 

func (p *Parser) ParseWithClaims(tokenString string, claims Claims, keyFunc Keyfunc) (*Token, error)

ParseWithClaims parses, validates, and verifies like Parse, but supplies a default object implementing the Claims interface. This provides default values which can be overridden and allows a caller to use their own type, rather than the default MapClaims implementation of Claims.

type ParserOption 

type ParserOption func(*Parser)

ParserOption is used to implement functional-style options that modify the behavior of the parser. To add new options, just create a function (ideally beginning with With or Without) that returns an anonymous function that takes a *Parser type as input and manipulates its configuration accordingly.

func WithJSONNumber 

func WithJSONNumber() ParserOption

WithJSONNumber is an option to configure the underlying JSON parser with UseNumber

func WithValidMethods 

func WithValidMethods(methods []string) ParserOption

WithValidMethods is an option to supply algorithm methods that the parser will check. Only those methods will be considered valid. It is heavily encouraged to use this option in order to prevent attacks such as https://auth0.com/blog/critical-vulnerabilities-in-json-web-token-libraries/.

func WithoutClaimsValidation 

func WithoutClaimsValidation() ParserOption

WithoutClaimsValidation is an option to disable claims validation. This option should only be used if you exactly know what you are doing.

type RegisteredClaims 

type RegisteredClaims struct {
	// the `iss` (Issuer) claim. See https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.1
	Issuer string `json:"iss,omitempty"`

	// the `sub` (Subject) claim. See https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.2
	Subject string `json:"sub,omitempty"`

	// the `aud` (Audience) claim. See https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.3
	Audience ClaimStrings `json:"aud,omitempty"`

	// the `exp` (Expiration Time) claim. See https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.4
	ExpiresAt *NumericDate `json:"exp,omitempty"`

	// the `nbf` (Not Before) claim. See https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.5
	NotBefore *NumericDate `json:"nbf,omitempty"`

	// the `iat` (Issued At) claim. See https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.6
	IssuedAt *NumericDate `json:"iat,omitempty"`

	// the `jti` (JWT ID) claim. See https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.7
	ID string `json:"jti,omitempty"`
}

RegisteredClaims are a structured version of the JWT Claims Set, restricted to Registered Claim Names, as referenced at https://datatracker.ietf.org/doc/html/rfc7519#section-4.1

This type can be used on its own, but then additional private and public claims embedded in the JWT will not be parsed. The typical usecase therefore is to embed this in a user-defined claim type.

See examples of how to use this with your own claim types.

func (RegisteredClaims) Valid 

func (c RegisteredClaims) Valid() error

Valid validates time-based claims "exp, iat, nbf". There is no accounting for clock skew. As well, if any of the above claims are not in the token, it will still be considered a valid claim.

func (*RegisteredClaims) VerifyAudience 

func (c *RegisteredClaims) VerifyAudience(cmp string, req bool) bool

VerifyAudience compares the aud claim against cmp. If required is false, this method will return true if the value matches or is unset

func (*RegisteredClaims) VerifyExpiresAt 

func (c *RegisteredClaims) VerifyExpiresAt(cmp time.Time, req bool) bool

VerifyExpiresAt compares the exp claim against cmp (cmp < exp). If req is false, it will return true if exp is unset.

func (*RegisteredClaims) VerifyIssuedAt 

func (c *RegisteredClaims) VerifyIssuedAt(cmp time.Time, req bool) bool

VerifyIssuedAt compares the iat claim against cmp (cmp >= iat). If req is false, it will return true if iat is unset.

func (*RegisteredClaims) VerifyIssuer 

func (c *RegisteredClaims) VerifyIssuer(cmp string, req bool) bool

VerifyIssuer compares the iss claim against cmp. If required is false, this method will return true if the value matches or is unset

func (*RegisteredClaims) VerifyNotBefore 

func (c *RegisteredClaims) VerifyNotBefore(cmp time.Time, req bool) bool

VerifyNotBefore compares the nbf claim against cmp (cmp >= nbf). If req is false, it will return true if nbf is unset.

type SigningMethod 

type SigningMethod interface {
	Verify(signingString, signature string, key interface{}) error // Returns nil if signature is valid
	Sign(signingString string, key interface{}) (string, error)    // Returns encoded signature or error
	Alg() string                                                   // returns the alg identifier for this method (example: 'HS256')
}

SigningMethod can be used add new methods for signing or verifying tokens.

func GetSigningMethod 

func GetSigningMethod(alg string) (method SigningMethod)

GetSigningMethod retrieves a signing method from an "alg" string

type SigningMethodECDSA 

type SigningMethodECDSA struct {
	Name      string
	Hash      crypto.Hash
	KeySize   int
	CurveBits int
}

SigningMethodECDSA implements the ECDSA family of signing methods. Expects *ecdsa.PrivateKey for signing and *ecdsa.PublicKey for verification 

var (
	SigningMethodES256 *SigningMethodECDSA
	SigningMethodES384 *SigningMethodECDSA
	SigningMethodES512 *SigningMethodECDSA
)

Specific instances for EC256 and company

func (*SigningMethodECDSA) Alg 

func (m *SigningMethodECDSA) Alg() string

func (*SigningMethodECDSA) Sign 

func (m *SigningMethodECDSA) Sign(signingString string, key interface{}) (string, error)

Sign implements token signing for the SigningMethod. For this signing method, key must be an ecdsa.PrivateKey struct

func (*SigningMethodECDSA) Verify 

func (m *SigningMethodECDSA) Verify(signingString, signature string, key interface{}) error

Verify implements token verification for the SigningMethod. For this verified method, key must be an ecdsa.PublicKey struct

type SigningMethodEd25519 

type SigningMethodEd25519 struct{}

SigningMethodEd25519 implements the EdDSA family. Expects ed25519.PrivateKey for signing and ed25519.PublicKey for verification 

var (
	SigningMethodEdDSA *SigningMethodEd25519
)

Specific instance for EdDSA

func (*SigningMethodEd25519) Alg 

func (m *SigningMethodEd25519) Alg() string

func (*SigningMethodEd25519) Sign 

func (m *SigningMethodEd25519) Sign(signingString string, key interface{}) (string, error)

Sign implements token signing for the SigningMethod. For this signing method, key must be an ed25519.PrivateKey

func (*SigningMethodEd25519) Verify 

func (m *SigningMethodEd25519) Verify(signingString, signature string, key interface{}) error

Verify implements token verification for the SigningMethod. For this verify method, key must be an ed25519.PublicKey

type SigningMethodHMAC 

type SigningMethodHMAC struct {
	Name string
	Hash crypto.Hash
}

SigningMethodHMAC implements the HMAC-SHA family of signing methods. Expects a key type of []byte for both signing and validation 

var (
	SigningMethodHS256  *SigningMethodHMAC
	SigningMethodHS384  *SigningMethodHMAC
	SigningMethodHS512  *SigningMethodHMAC
	ErrSignatureInvalid = errors.New("signature is invalid")
)

Specific instances for HS256 and company

func (*SigningMethodHMAC) Alg 

func (m *SigningMethodHMAC) Alg() string

func (*SigningMethodHMAC) Sign 

func (m *SigningMethodHMAC) Sign(signingString string, key interface{}) (string, error)

Sign implements token signing for the SigningMethod. Key must be []byte

func (*SigningMethodHMAC) Verify 

func (m *SigningMethodHMAC) Verify(signingString, signature string, key interface{}) error

Verify implements token verification for the SigningMethod. Returns nil if the signature is valid.

type SigningMethodRSA 

type SigningMethodRSA struct {
	Name string
	Hash crypto.Hash
}

SigningMethodRSA implements the RSA family of signing methods. Expects *rsa.PrivateKey for signing and *rsa.PublicKey for validation 

var (
	SigningMethodRS256 *SigningMethodRSA
	SigningMethodRS384 *SigningMethodRSA
	SigningMethodRS512 *SigningMethodRSA
)

Specific instances for RS256 and company

func (*SigningMethodRSA) Alg 

func (m *SigningMethodRSA) Alg() string

func (*SigningMethodRSA) Sign 

func (m *SigningMethodRSA) Sign(signingString string, key interface{}) (string, error)

Sign implements token signing for the SigningMethod For this signing method, must be an *rsa.PrivateKey structure.

func (*SigningMethodRSA) Verify 

func (m *SigningMethodRSA) Verify(signingString, signature string, key interface{}) error

Verify implements token verification for the SigningMethod For this signing method, must be an *rsa.PublicKey structure.

type SigningMethodRSAPSS 

type SigningMethodRSAPSS struct {
	*SigningMethodRSA
	Options *rsa.PSSOptions
	// VerifyOptions is optional. If set overrides Options for rsa.VerifyPPS.
	// Used to accept tokens signed with rsa.PSSSaltLengthAuto, what doesn't follow
	// https://tools.ietf.org/html/rfc7518#section-3.5 but was used previously.
	VerifyOptions *rsa.PSSOptions
}

SigningMethodRSAPSS implements the RSAPSS family of signing methods 

var (
	SigningMethodPS256 *SigningMethodRSAPSS
	SigningMethodPS384 *SigningMethodRSAPSS
	SigningMethodPS512 *SigningMethodRSAPSS
)

Specific instances for RS/PS and company.

func (*SigningMethodRSAPSS) Sign 

func (m *SigningMethodRSAPSS) Sign(signingString string, key interface{}) (string, error)

Sign implements token signing for the SigningMethod. For this signing method, key must be a rsa.PrivateKey struct

func (*SigningMethodRSAPSS) Verify 

func (m *SigningMethodRSAPSS) Verify(signingString, signature string, key interface{}) error

Verify implements token verification for the SigningMethod. For this verify method, key must be an rsa.PublicKey struct

type Token 

type Token struct {
	Raw       string                 // The raw token.  Populated when you Parse a token
	Method    SigningMethod          // The signing method used or to be used
	Header    map[string]interface{} // The first segment of the token
	Claims    Claims                 // The second segment of the token
	Signature string                 // The third segment of the token.  Populated when you Parse a token
	Valid     bool                   // Is the token valid?  Populated when you Parse/Verify a token
}

Token represents a JWT Token. Different fields will be used depending on whether you're creating or parsing/verifying a token.

func New 

func New(method SigningMethod) *Token

New creates a new Token with the specified signing method and an empty map of claims.

func NewWithClaims 

func NewWithClaims(method SigningMethod, claims Claims) *Token

NewWithClaims creates a new Token with the specified signing method and claims.

func Parse 

func Parse(tokenString string, keyFunc Keyfunc, options ...ParserOption) (*Token, error)

Parse parses, validates, verifies the signature and returns the parsed token. keyFunc will receive the parsed token and should return the cryptographic key for verifying the signature. The caller is strongly encouraged to set the WithValidMethods option to validate the 'alg' claim in the token matches the expected algorithm. For more details about the importance of validating the 'alg' claim, see https://auth0.com/blog/critical-vulnerabilities-in-json-web-token-libraries/

func ParseWithClaims 

func ParseWithClaims(tokenString string, claims Claims, keyFunc Keyfunc, options ...ParserOption) (*Token, error)

func (*Token) SignedString 

func (t *Token) SignedString(key interface{}) (string, error)

SignedString creates and returns a complete, signed JWT. The token is signed using the SigningMethod specified in the token.

func (*Token) SigningString 

func (t *Token) SigningString() (string, error)

SigningString generates the signing string. This is the most expensive part of the whole deal. Unless you need this for something special, just go straight for the SignedString.

type ValidationError 

type ValidationError struct {
	Inner  error  // stores the error returned by external dependencies, i.e.: KeyFunc
	Errors uint32 // bitfield.  see ValidationError... constants
	// contains filtered or unexported fields
}

ValidationError represents an error from Parse if token is not valid

func NewValidationError 

func NewValidationError(errorText string, errorFlags uint32) *ValidationError

NewValidationError is a helper for constructing a ValidationError with a string error message

func (ValidationError) Error 

func (e ValidationError) Error() string

Error is the implementation of the err interface.

func (*ValidationError) Is 

func (e *ValidationError) Is(err error) bool

Is checks if this ValidationError is of the supplied error. We are first checking for the exact error message by comparing the inner error message. If that fails, we compare using the error flags. This way we can use custom error messages (mainly for backwards compatability) and still leverage errors.Is using the global error variables.

func (*ValidationError) Unwrap 

func (e *ValidationError) Unwrap() error

Unwrap gives errors.Is and errors.As access to the inner error.

Source Files

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