mirror of
https://github.com/wneessen/go-mail.git
synced 2024-11-22 05:40:50 +01:00
feat: migrated resources from external repo to remove external dependency
This commit is contained in:
theexiile1305
parent
128b2bd32e
commit
efd8aa93b6
4 changed files with 576 additions and 4 deletions
3
go.mod
3
go.mod
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@ -7,7 +7,6 @@ module github.com/wneessen/go-mail
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go 1.16
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require (
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go.mozilla.org/pkcs7 v0.9.0
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golang.org/x/crypto v0.28.0
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golang.org/x/text v0.19.0
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)
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)
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2
go.sum
2
go.sum
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@ -20,8 +20,6 @@ golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
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golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
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golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
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golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
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go.mozilla.org/pkcs7 v0.9.0 h1:yM4/HS9dYv7ri2biPtxt8ikvB37a980dg69/pKmS+eI=
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go.mozilla.org/pkcs7 v0.9.0/go.mod h1:SNgMg+EgDFwmvSmLRTNKC5fegJjB7v23qTQ0XLGUNHk=
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golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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386
pkcs7.go
Normal file
386
pkcs7.go
Normal file
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@ -0,0 +1,386 @@
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// SPDX-FileCopyrightText: 2022-2023 The go-mail Authors
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//
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// SPDX-License-Identifier: MIT
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package mail
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import (
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"bytes"
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/asn1"
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"errors"
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"fmt"
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"math/big"
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"sort"
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"time"
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_ "crypto/sha1" // for crypto.SHA1
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)
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// PKCS7 Represents a PKCS7 structure
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type PKCS7 struct {
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Content []byte
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Certificates []*x509.Certificate
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CRLs []pkix.CertificateList
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Signers []signerInfo
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raw interface{}
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}
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type contentInfo struct {
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ContentType asn1.ObjectIdentifier
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Content asn1.RawValue `asn1:"explicit,optional,tag:0"`
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}
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var (
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oidData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 1}
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oidSignedData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 2}
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oidAttributeContentType = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 3}
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oidAttributeMessageDigest = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 4}
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oidAttributeSigningTime = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 5}
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)
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type signedData struct {
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Version int `asn1:"default:1"`
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DigestAlgorithmIdentifiers []pkix.AlgorithmIdentifier `asn1:"set"`
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ContentInfo contentInfo
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Certificates rawCertificates `asn1:"optional,tag:0"`
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CRLs []pkix.CertificateList `asn1:"optional,tag:1"`
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SignerInfos []signerInfo `asn1:"set"`
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}
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type rawCertificates struct {
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Raw asn1.RawContent
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}
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type attribute struct {
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Type asn1.ObjectIdentifier
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Value asn1.RawValue `asn1:"set"`
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}
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type issuerAndSerial struct {
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IssuerName asn1.RawValue
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SerialNumber *big.Int
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}
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// MessageDigestMismatchError is returned when the signer data digest does not
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// match the computed digest for the contained content
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type MessageDigestMismatchError struct {
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ExpectedDigest []byte
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ActualDigest []byte
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}
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func (err *MessageDigestMismatchError) Error() string {
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return fmt.Sprintf("pkcs7: Message digest mismatch\n\tExpected: %X\n\tActual : %X", err.ExpectedDigest, err.ActualDigest)
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}
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type signerInfo struct {
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Version int `asn1:"default:1"`
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IssuerAndSerialNumber issuerAndSerial
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DigestAlgorithm pkix.AlgorithmIdentifier
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AuthenticatedAttributes []attribute `asn1:"optional,tag:0"`
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DigestEncryptionAlgorithm pkix.AlgorithmIdentifier
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EncryptedDigest []byte
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UnauthenticatedAttributes []attribute `asn1:"optional,tag:1"`
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}
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func (raw rawCertificates) Parse() ([]*x509.Certificate, error) {
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if len(raw.Raw) == 0 {
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return nil, nil
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}
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var val asn1.RawValue
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if _, err := asn1.Unmarshal(raw.Raw, &val); err != nil {
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return nil, err
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}
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return x509.ParseCertificates(val.Bytes)
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}
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func marshalAttributes(attrs []attribute) ([]byte, error) {
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encodedAttributes, err := asn1.Marshal(struct {
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A []attribute `asn1:"set"`
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}{A: attrs})
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if err != nil {
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return nil, err
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}
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// Remove the leading sequence octets
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var raw asn1.RawValue
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asn1.Unmarshal(encodedAttributes, &raw)
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return raw.Bytes, nil
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}
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var (
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oidDigestAlgorithmSHA1 = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 26}
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oidSignatureSHA1WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 5}
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)
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func getCertFromCertsByIssuerAndSerial(certs []*x509.Certificate, ias issuerAndSerial) *x509.Certificate {
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for _, cert := range certs {
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if isCertMatchForIssuerAndSerial(cert, ias) {
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return cert
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}
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}
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return nil
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}
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// GetOnlySigner returns an x509.Certificate for the first signer of the signed
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// data payload. If there are more or less than one signer, nil is returned
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func (p7 *PKCS7) GetOnlySigner() *x509.Certificate {
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if len(p7.Signers) != 1 {
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return nil
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}
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signer := p7.Signers[0]
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return getCertFromCertsByIssuerAndSerial(p7.Certificates, signer.IssuerAndSerialNumber)
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}
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// ErrUnsupportedAlgorithm tells you when our quick dev assumptions have failed
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var ErrUnsupportedAlgorithm = errors.New("pkcs7: cannot decrypt data: only RSA, DES, DES-EDE3, AES-256-CBC and AES-128-GCM supported")
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func isCertMatchForIssuerAndSerial(cert *x509.Certificate, ias issuerAndSerial) bool {
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return cert.SerialNumber.Cmp(ias.SerialNumber) == 0 && bytes.Compare(cert.RawIssuer, ias.IssuerName.FullBytes) == 0
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}
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func unmarshalAttribute(attrs []attribute, attributeType asn1.ObjectIdentifier, out interface{}) error {
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for _, attr := range attrs {
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if attr.Type.Equal(attributeType) {
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_, err := asn1.Unmarshal(attr.Value.Bytes, out)
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return err
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}
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}
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return errors.New("pkcs7: attribute type not in attributes")
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}
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// UnmarshalSignedAttribute decodes a single attribute from the signer info
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func (p7 *PKCS7) UnmarshalSignedAttribute(attributeType asn1.ObjectIdentifier, out interface{}) error {
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sd, ok := p7.raw.(signedData)
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if !ok {
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return errors.New("pkcs7: payload is not signedData content")
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}
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if len(sd.SignerInfos) < 1 {
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return errors.New("pkcs7: payload has no signers")
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}
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attributes := sd.SignerInfos[0].AuthenticatedAttributes
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return unmarshalAttribute(attributes, attributeType, out)
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}
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// SignedData is an opaque data structure for creating signed data payloads
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type SignedData struct {
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sd signedData
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certs []*x509.Certificate
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messageDigest []byte
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}
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// Attribute represents a key value pair attribute. Value must be marshalable byte
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// `encoding/asn1`
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type Attribute struct {
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Type asn1.ObjectIdentifier
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Value interface{}
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}
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// SignerInfoConfig are optional values to include when adding a signer
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type SignerInfoConfig struct {
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ExtraSignedAttributes []Attribute
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}
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// newSignedData initializes a SignedData with content
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func newSignedData(data []byte) (*SignedData, error) {
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content, err := asn1.Marshal(data)
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if err != nil {
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return nil, err
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}
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ci := contentInfo{
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ContentType: oidData,
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Content: asn1.RawValue{Class: 2, Tag: 0, Bytes: content, IsCompound: true},
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}
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digAlg := pkix.AlgorithmIdentifier{
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Algorithm: oidDigestAlgorithmSHA1,
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}
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h := crypto.SHA1.New()
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h.Write(data)
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md := h.Sum(nil)
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sd := signedData{
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ContentInfo: ci,
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Version: 1,
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DigestAlgorithmIdentifiers: []pkix.AlgorithmIdentifier{digAlg},
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}
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return &SignedData{sd: sd, messageDigest: md}, nil
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}
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type attributes struct {
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types []asn1.ObjectIdentifier
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values []interface{}
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}
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// Add adds the attribute, maintaining insertion order
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func (attrs *attributes) Add(attrType asn1.ObjectIdentifier, value interface{}) {
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attrs.types = append(attrs.types, attrType)
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attrs.values = append(attrs.values, value)
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}
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type sortableAttribute struct {
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SortKey []byte
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Attribute attribute
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}
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type attributeSet []sortableAttribute
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func (sa attributeSet) Len() int {
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return len(sa)
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}
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func (sa attributeSet) Less(i, j int) bool {
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return bytes.Compare(sa[i].SortKey, sa[j].SortKey) < 0
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}
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func (sa attributeSet) Swap(i, j int) {
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sa[i], sa[j] = sa[j], sa[i]
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}
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func (sa attributeSet) attributes() []attribute {
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attrs := make([]attribute, len(sa))
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for i, attr := range sa {
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attrs[i] = attr.Attribute
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}
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return attrs
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}
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func (attrs *attributes) forMarshaling() ([]attribute, error) {
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sortables := make(attributeSet, len(attrs.types))
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for i := range sortables {
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attrType := attrs.types[i]
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attrValue := attrs.values[i]
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asn1Value, err := asn1.Marshal(attrValue)
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if err != nil {
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return nil, err
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}
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attr := attribute{
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Type: attrType,
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Value: asn1.RawValue{Tag: 17, IsCompound: true, Bytes: asn1Value}, // 17 == SET tag
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}
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encoded, err := asn1.Marshal(attr)
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if err != nil {
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return nil, err
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}
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sortables[i] = sortableAttribute{
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SortKey: encoded,
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Attribute: attr,
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}
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}
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sort.Sort(sortables)
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return sortables.attributes(), nil
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}
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// addSigner signs attributes about the content and adds certificate to payload
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func (sd *SignedData) addSigner(cert *x509.Certificate, pkey crypto.PrivateKey, config SignerInfoConfig) error {
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attrs := &attributes{}
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attrs.Add(oidAttributeContentType, sd.sd.ContentInfo.ContentType)
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attrs.Add(oidAttributeMessageDigest, sd.messageDigest)
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attrs.Add(oidAttributeSigningTime, time.Now())
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for _, attr := range config.ExtraSignedAttributes {
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attrs.Add(attr.Type, attr.Value)
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}
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finalAttrs, err := attrs.forMarshaling()
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if err != nil {
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return err
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}
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signature, err := signAttributes(finalAttrs, pkey, crypto.SHA1)
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if err != nil {
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return err
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}
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ias, err := cert2issuerAndSerial(cert)
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if err != nil {
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return err
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}
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signer := signerInfo{
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AuthenticatedAttributes: finalAttrs,
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DigestAlgorithm: pkix.AlgorithmIdentifier{Algorithm: oidDigestAlgorithmSHA1},
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DigestEncryptionAlgorithm: pkix.AlgorithmIdentifier{Algorithm: oidSignatureSHA1WithRSA},
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IssuerAndSerialNumber: ias,
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EncryptedDigest: signature,
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Version: 1,
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}
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// create signature of signed attributes
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sd.certs = append(sd.certs, cert)
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sd.sd.SignerInfos = append(sd.sd.SignerInfos, signer)
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return nil
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}
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// addCertificate adds the certificate to the payload. Useful for parent certificates
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func (sd *SignedData) addCertificate(cert *x509.Certificate) {
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sd.certs = append(sd.certs, cert)
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}
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// detach removes content from the signed data struct to make it a detached signature.
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// This must be called right before Finish()
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func (sd *SignedData) detach() {
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sd.sd.ContentInfo = contentInfo{ContentType: oidData}
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}
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// finish marshals the content and its signers
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func (sd *SignedData) finish() ([]byte, error) {
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sd.sd.Certificates = marshalCertificates(sd.certs)
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inner, err := asn1.Marshal(sd.sd)
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if err != nil {
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return nil, err
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}
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outer := contentInfo{
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ContentType: oidSignedData,
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Content: asn1.RawValue{Class: 2, Tag: 0, Bytes: inner, IsCompound: true},
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}
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return asn1.Marshal(outer)
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}
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func cert2issuerAndSerial(cert *x509.Certificate) (issuerAndSerial, error) {
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var ias issuerAndSerial
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// The issuer RDNSequence has to match exactly the sequence in the certificate
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// We cannot use cert.Issuer.ToRDNSequence() here since it mangles the sequence
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ias.IssuerName = asn1.RawValue{FullBytes: cert.RawIssuer}
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ias.SerialNumber = cert.SerialNumber
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return ias, nil
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}
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// signs the DER encoded form of the attributes with the private key
|
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func signAttributes(attrs []attribute, pkey crypto.PrivateKey, hash crypto.Hash) ([]byte, error) {
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attrBytes, err := marshalAttributes(attrs)
|
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if err != nil {
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return nil, err
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}
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h := hash.New()
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h.Write(attrBytes)
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hashed := h.Sum(nil)
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switch priv := pkey.(type) {
|
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case *rsa.PrivateKey:
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return rsa.SignPKCS1v15(rand.Reader, priv, crypto.SHA1, hashed)
|
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}
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return nil, ErrUnsupportedAlgorithm
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}
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|
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// concats and wraps the certificates in the RawValue structure
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func marshalCertificates(certs []*x509.Certificate) rawCertificates {
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var buf bytes.Buffer
|
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for _, cert := range certs {
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buf.Write(cert.Raw)
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}
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rawCerts, _ := marshalCertificateBytes(buf.Bytes())
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return rawCerts
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}
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// Even though, the tag & length are stripped out during marshalling the
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// RawContent, we have to encode it into the RawContent. If its missing,
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// then `asn1.Marshal()` will strip out the certificate wrapper instead.
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func marshalCertificateBytes(certs []byte) (rawCertificates, error) {
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var val = asn1.RawValue{Bytes: certs, Class: 2, Tag: 0, IsCompound: true}
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b, err := asn1.Marshal(val)
|
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if err != nil {
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return rawCertificates{}, err
|
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}
|
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return rawCertificates{Raw: b}, nil
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}
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189
pkcs7_test.go
Normal file
189
pkcs7_test.go
Normal file
|
|
@ -0,0 +1,189 @@
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// SPDX-FileCopyrightText: 2022-2023 The go-mail Authors
|
||||
//
|
||||
// SPDX-License-Identifier: MIT
|
||||
|
||||
package mail
|
||||
|
||||
import (
|
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"crypto"
|
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"crypto/rand"
|
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"crypto/rsa"
|
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"crypto/x509"
|
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"crypto/x509/pkix"
|
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"encoding/pem"
|
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"fmt"
|
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"io/ioutil"
|
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"math/big"
|
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"os"
|
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"os/exec"
|
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"testing"
|
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"time"
|
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)
|
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|
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// TestSign_E2E tests S/MIME singing as e2e
|
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func TestSign_E2E(t *testing.T) {
|
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cert, err := createTestCertificate()
|
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if err != nil {
|
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t.Fatal(err)
|
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}
|
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content := []byte("Hello World")
|
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for _, testDetach := range []bool{false, true} {
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toBeSigned, err := newSignedData(content)
|
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if err != nil {
|
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t.Fatalf("Cannot initialize signed data: %s", err)
|
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}
|
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if err := toBeSigned.addSigner(cert.Certificate, cert.PrivateKey, SignerInfoConfig{}); err != nil {
|
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t.Fatalf("Cannot add signer: %s", err)
|
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}
|
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if testDetach {
|
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t.Log("Testing detached signature")
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toBeSigned.detach()
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} else {
|
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t.Log("Testing attached signature")
|
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}
|
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signed, err := toBeSigned.finish()
|
||||
if err != nil {
|
||||
t.Fatalf("Cannot finish signing data: %s", err)
|
||||
}
|
||||
if err := pem.Encode(os.Stdout, &pem.Block{Type: "PKCS7", Bytes: signed}); err != nil {
|
||||
t.Fatalf("Cannot write signed data: %s", err)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestOpenSSLVerifyDetachedSignature(t *testing.T) {
|
||||
rootCert, err := createTestCertificateByIssuer("PKCS7 Test Root CA", nil)
|
||||
if err != nil {
|
||||
t.Fatalf("Cannot generate root cert: %s", err)
|
||||
}
|
||||
signerCert, err := createTestCertificateByIssuer("PKCS7 Test Signer Cert", rootCert)
|
||||
if err != nil {
|
||||
t.Fatalf("Cannot generate signer cert: %s", err)
|
||||
}
|
||||
content := []byte("Hello World")
|
||||
toBeSigned, err := newSignedData(content)
|
||||
if err != nil {
|
||||
t.Fatalf("Cannot initialize signed data: %s", err)
|
||||
}
|
||||
if err := toBeSigned.addSigner(signerCert.Certificate, signerCert.PrivateKey, SignerInfoConfig{}); err != nil {
|
||||
t.Fatalf("Cannot add signer: %s", err)
|
||||
}
|
||||
toBeSigned.detach()
|
||||
signed, err := toBeSigned.finish()
|
||||
if err != nil {
|
||||
t.Fatalf("Cannot finish signing data: %s", err)
|
||||
}
|
||||
|
||||
// write the root cert to a temp file
|
||||
tmpRootCertFile, err := ioutil.TempFile("", "pkcs7TestRootCA")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
defer os.Remove(tmpRootCertFile.Name()) // clean up
|
||||
fd, err := os.OpenFile(tmpRootCertFile.Name(), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
pem.Encode(fd, &pem.Block{Type: "CERTIFICATE", Bytes: rootCert.Certificate.Raw})
|
||||
fd.Close()
|
||||
|
||||
// write the signature to a temp file
|
||||
tmpSignatureFile, err := ioutil.TempFile("", "pkcs7Signature")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
defer os.Remove(tmpSignatureFile.Name()) // clean up
|
||||
ioutil.WriteFile(tmpSignatureFile.Name(), signed, 0755)
|
||||
|
||||
// write the content to a temp file
|
||||
tmpContentFile, err := ioutil.TempFile("", "pkcs7Content")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
defer os.Remove(tmpContentFile.Name()) // clean up
|
||||
ioutil.WriteFile(tmpContentFile.Name(), content, 0755)
|
||||
|
||||
// call openssl to verify the signature on the content using the root
|
||||
opensslCMD := exec.Command("openssl", "smime", "-verify",
|
||||
"-in", tmpSignatureFile.Name(), "-inform", "DER",
|
||||
"-content", tmpContentFile.Name(),
|
||||
"-CAfile", tmpRootCertFile.Name())
|
||||
out, err := opensslCMD.Output()
|
||||
t.Logf("%s", out)
|
||||
if err != nil {
|
||||
t.Fatalf("openssl command failed with %s", err)
|
||||
}
|
||||
}
|
||||
|
||||
type certKeyPair struct {
|
||||
Certificate *x509.Certificate
|
||||
PrivateKey *rsa.PrivateKey
|
||||
}
|
||||
|
||||
func createTestCertificate() (*certKeyPair, error) {
|
||||
signer, err := createTestCertificateByIssuer("Eddard Stark", nil)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
fmt.Println("Created root cert")
|
||||
if err := pem.Encode(os.Stdout, &pem.Block{Type: "CERTIFICATE", Bytes: signer.Certificate.Raw}); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
pair, err := createTestCertificateByIssuer("Jon Snow", signer)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
fmt.Println("Created signer cert")
|
||||
if err := pem.Encode(os.Stdout, &pem.Block{Type: "CERTIFICATE", Bytes: pair.Certificate.Raw}); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return pair, nil
|
||||
}
|
||||
|
||||
func createTestCertificateByIssuer(name string, issuer *certKeyPair) (*certKeyPair, error) {
|
||||
priv, err := rsa.GenerateKey(rand.Reader, 1024)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 32)
|
||||
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
template := x509.Certificate{
|
||||
SerialNumber: serialNumber,
|
||||
SignatureAlgorithm: x509.SHA256WithRSA,
|
||||
Subject: pkix.Name{
|
||||
CommonName: name,
|
||||
Organization: []string{"Acme Co"},
|
||||
},
|
||||
NotBefore: time.Now(),
|
||||
NotAfter: time.Now().AddDate(1, 0, 0),
|
||||
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
|
||||
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageEmailProtection},
|
||||
}
|
||||
var issuerCert *x509.Certificate
|
||||
var issuerKey crypto.PrivateKey
|
||||
if issuer != nil {
|
||||
issuerCert = issuer.Certificate
|
||||
issuerKey = issuer.PrivateKey
|
||||
} else {
|
||||
template.IsCA = true
|
||||
template.KeyUsage |= x509.KeyUsageCertSign
|
||||
issuerCert = &template
|
||||
issuerKey = priv
|
||||
}
|
||||
cert, err := x509.CreateCertificate(rand.Reader, &template, issuerCert, priv.Public(), issuerKey)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
leaf, err := x509.ParseCertificate(cert)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return &certKeyPair{
|
||||
Certificate: leaf,
|
||||
PrivateKey: priv,
|
||||
}, nil
|
||||
}
|
||||
Loading…
Reference in a new issue