dsig

package module
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 Go to latest Published: Apr 30, 2018 License: Apache-2.0 Imports: 19 Imported by: 0

README

goxmldsig

Build Status GoDoc

XML Digital Signatures implemented in pure Go.

Installation

Install goxmldsig into your $GOPATH using go get:

$ go get github.com/russellhaering/goxmldsig

Usage

Signing
package main

import (
    "github.com/beevik/etree"
    "github.com/russellhaering/goxmldsig"
)

func main() {
    // Generate a key and self-signed certificate for signing
    randomKeyStore := dsig.RandomKeyStoreForTest()
    ctx := dsig.NewDefaultSigningContext(randomKeyStore)
    elementToSign := &etree.Element{
        Tag: "ExampleElement",
    }
    elementToSign.CreateAttr("ID", "id1234")

    // Sign the element
    signedElement, err := ctx.SignEnveloped(elementToSign)
    if err != nil {
        panic(err)
    }

    // Serialize the signed element. It is important not to modify the element
    // after it has been signed - even pretty-printing the XML will invalidate
    // the signature.
    doc := etree.NewDocument()
    doc.SetRoot(signedElement)
    str, err := doc.WriteToString()
    if err != nil {
        panic(err)
    }

    println(str)
}
Signature Validation
// Validate an element against a root certificate
func validate(root *x509.Certificate, el *etree.Element) {
    // Construct a signing context with one or more roots of trust.
    ctx := dsig.NewDefaultValidationContext(&dsig.MemoryX509CertificateStore{
        Roots: []*x509.Certificate{root},
    })

    // It is important to only use the returned validated element.
    // See: https://www.w3.org/TR/xmldsig-bestpractices/#check-what-is-signed
    validated, err := ctx.Validate(el)
    if err != nil {
        panic(err)
    }

    doc := etree.NewDocument()
    doc.SetRoot(validated)
    str, err := doc.WriteToString()
    if err != nil {
        panic(err)
    }

    println(str)
}

Limitations

This library was created in order to implement SAML 2.0 without needing to execute a command line tool to create and validate signatures. It currently only implements the subset of relevant standards needed to support that implementation, but I hope to make it more complete over time. Contributions are welcome.

Documentation

Index

Constants

View Source 
const (
	DefaultPrefix = "ds"
	Namespace     = "http://www.w3.org/2000/09/xmldsig#"
)
View Source 
const (
	SignatureTag              = "Signature"
	SignedInfoTag             = "SignedInfo"
	CanonicalizationMethodTag = "CanonicalizationMethod"
	SignatureMethodTag        = "SignatureMethod"
	ReferenceTag              = "Reference"
	TransformsTag             = "Transforms"
	TransformTag              = "Transform"
	DigestMethodTag           = "DigestMethod"
	DigestValueTag            = "DigestValue"
	SignatureValueTag         = "SignatureValue"
	KeyInfoTag                = "KeyInfo"
	X509DataTag               = "X509Data"
	X509CertificateTag        = "X509Certificate"
	InclusiveNamespacesTag    = "InclusiveNamespaces"
)

Tags

View Source 
const (
	AlgorithmAttr  = "Algorithm"
	URIAttr        = "URI"
	DefaultIdAttr  = "ID"
	PrefixListAttr = "PrefixList"
)
View Source 
const (
	RSASHA1SignatureMethod   = "http://www.w3.org/2000/09/xmldsig#rsa-sha1"
	RSASHA256SignatureMethod = "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"
	RSASHA512SignatureMethod = "http://www.w3.org/2001/04/xmldsig-more#rsa-sha512"
)

Variables

View Source 
var (
	ErrNonRSAKey           = fmt.Errorf("Private key was not RSA")
	ErrMissingCertificates = fmt.Errorf("No public certificates provided")
)

Well-known errors

View Source 
var (
	// ErrMissingSignature indicates that no enveloped signature was found referencing
	// the top level element passed for signature verification.
	ErrMissingSignature = errors.New("Missing signature referencing the top-level element")
)

Functions

This section is empty.

Types

type AlgorithmID 

type AlgorithmID string
const (
	// Supported canonicalization algorithms
	CanonicalXML10ExclusiveAlgorithmId AlgorithmID = "http://www.w3.org/2001/10/xml-exc-c14n#"
	CanonicalXML11AlgorithmId          AlgorithmID = "http://www.w3.org/2006/12/xml-c14n11"

	CanonicalXML10RecAlgorithmId     AlgorithmID = "http://www.w3.org/TR/2001/REC-xml-c14n-20010315"
	CanonicalXML10CommentAlgorithmId AlgorithmID = "http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments"

	EnvelopedSignatureAltorithmId AlgorithmID = "http://www.w3.org/2000/09/xmldsig#enveloped-signature"
)

Well-known signature algorithms

func (AlgorithmID) String 

func (id AlgorithmID) String() string

type Canonicalizer 

type Canonicalizer interface {
	Canonicalize(el *etree.Element) ([]byte, error)
	Algorithm() AlgorithmID
}

Canonicalizer is an implementation of a canonicalization algorithm.

func MakeC14N10CommentCanonicalizer 

func MakeC14N10CommentCanonicalizer() Canonicalizer

MakeC14N10CommentCanonicalizer constructs an inclusive canonicalizer.

func MakeC14N10ExclusiveCanonicalizerWithPrefixList 

func MakeC14N10ExclusiveCanonicalizerWithPrefixList(prefixList string) Canonicalizer

MakeC14N10ExclusiveCanonicalizerWithPrefixList constructs an exclusive Canonicalizer from a PrefixList in NMTOKENS format (a white space separated list).

func MakeC14N10RecCanonicalizer 

func MakeC14N10RecCanonicalizer() Canonicalizer

MakeC14N10RecCanonicalizer constructs an inclusive canonicalizer.

func MakeC14N11Canonicalizer 

func MakeC14N11Canonicalizer() Canonicalizer

MakeC14N11Canonicalizer constructs an inclusive canonicalizer.

type Clock 

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

Clock wraps a clockwork.Clock (which could be real or fake) in order to default to a real clock when a nil *Clock is used. In other words, if you attempt to use a nil *Clock it will defer to the real system clock. This allows Clock to be easily added to structs with methods that currently reference the time package, without requiring every instantiation of that struct to be updated.

func NewFakeClock 

func NewFakeClock(wrapped clockwork.Clock) *Clock

func NewFakeClockAt 

func NewFakeClockAt(t time.Time) *Clock

func NewRealClock 

func NewRealClock() *Clock

func (*Clock) After 

func (c *Clock) After(d time.Duration) <-chan time.Time

func (*Clock) Now 

func (c *Clock) Now() time.Time

func (*Clock) Sleep 

func (c *Clock) Sleep(d time.Duration)

type MemoryX509CertificateStore 

type MemoryX509CertificateStore struct {
	Roots []*x509.Certificate
}

func (*MemoryX509CertificateStore) Certificates 

func (mX509cs *MemoryX509CertificateStore) Certificates() ([]*x509.Certificate, error)

type MemoryX509KeyStore 

type MemoryX509KeyStore struct {
	// contains filtered or unexported fields
}

func (*MemoryX509KeyStore) GetKeyPair 

func (ks *MemoryX509KeyStore) GetKeyPair() (*rsa.PrivateKey, []byte, error)

type SigningContext 

type SigningContext struct {
	Hash          crypto.Hash
	KeyStore      X509KeyStore
	IdAttribute   string
	Prefix        string
	Canonicalizer Canonicalizer
}

func NewDefaultSigningContext 

func NewDefaultSigningContext(ks X509KeyStore) *SigningContext

func (*SigningContext) ConstructSignature 

func (ctx *SigningContext) ConstructSignature(el *etree.Element, enveloped bool) (*etree.Element, error)

func (*SigningContext) GetDigestAlgorithmIdentifier 

func (ctx *SigningContext) GetDigestAlgorithmIdentifier() string

func (*SigningContext) GetSignatureMethodIdentifier 

func (ctx *SigningContext) GetSignatureMethodIdentifier() string

func (*SigningContext) SetSignatureMethod 

func (ctx *SigningContext) SetSignatureMethod(algorithmID string) error

func (*SigningContext) SignEnveloped 

func (ctx *SigningContext) SignEnveloped(el *etree.Element) (*etree.Element, error)

func (*SigningContext) SignString 

func (ctx *SigningContext) SignString(content string) ([]byte, error)

Useful for signing query string (including DEFLATED AuthnRequest) when using HTTP-Redirect to make a signed request. See 3.4.4.1 DEFLATE Encoding of https://docs.oasis-open.org/security/saml/v2.0/saml-bindings-2.0-os.pdf

type TLSCertKeyStore 

type TLSCertKeyStore tls.Certificate

TLSCertKeyStore wraps the stdlib tls.Certificate to return its contained key and certs.

func (TLSCertKeyStore) GetChain 

func (d TLSCertKeyStore) GetChain() ([][]byte, error)

GetChain impliments X509ChainStore using the underlying tls.Certificate

func (TLSCertKeyStore) GetKeyPair 

func (d TLSCertKeyStore) GetKeyPair() (*rsa.PrivateKey, []byte, error)

GetKeyPair implements X509KeyStore using the underlying tls.Certificate

type ValidationContext 

type ValidationContext struct {
	CertificateStore X509CertificateStore
	IdAttribute      string
	Clock            *Clock
}

func NewDefaultValidationContext 

func NewDefaultValidationContext(certificateStore X509CertificateStore) *ValidationContext

func (*ValidationContext) Validate 

func (ctx *ValidationContext) Validate(el *etree.Element) (*etree.Element, error)

Validate verifies that the passed element contains a valid enveloped signature matching a currently-valid certificate in the context's CertificateStore.

type X509CertificateStore 

type X509CertificateStore interface {
	Certificates() (roots []*x509.Certificate, err error)
}

type X509ChainStore 

type X509ChainStore interface {
	GetChain() (certs [][]byte, err error)
}

type X509KeyStore 

type X509KeyStore interface {
	GetKeyPair() (privateKey *rsa.PrivateKey, cert []byte, err error)
}

func RandomKeyStoreForTest 

func RandomKeyStoreForTest() X509KeyStore

Source Files

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