mirror of
https://github.com/wneessen/go-mail.git
synced 2024-12-22 18:50:37 +01:00
feat: using sha256 instead of sha1
This commit is contained in:
theexiile1305
parent
e56a563286
commit
7e0511407b
1 changed files with 228 additions and 164 deletions
392
pkcs7.go
392
pkcs7.go
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@ -7,6 +7,7 @@ package mail
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import (
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"bytes"
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"crypto"
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"crypto/ecdsa"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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@ -18,9 +19,25 @@ import (
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"sort"
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"time"
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_ "crypto/sha1" // for crypto.SHA1
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_ "crypto/sha256" // for crypto.SHA256
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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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OIDDigestAlgorithmSHA256 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 1}
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OIDDigestAlgorithmECDSASHA256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 2}
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OIDEncryptionAlgorithmRSASHA256 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 11}
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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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// PKCS7 Represents a PKCS7 structure
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type PKCS7 struct {
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Content []byte
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@ -30,19 +47,34 @@ type PKCS7 struct {
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raw interface{}
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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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// 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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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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@ -56,6 +88,19 @@ type rawCertificates struct {
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Raw asn1.RawContent
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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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type attribute struct {
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Type asn1.ObjectIdentifier
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Value asn1.RawValue `asn1:"set"`
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@ -87,96 +132,6 @@ type signerInfo struct {
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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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if _, err := asn1.Unmarshal(encodedAttributes, &raw); err != nil {
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return nil, err
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}
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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.Equal(cert.RawIssuer, ias.IssuerName.FullBytes)
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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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@ -186,31 +141,8 @@ type Attribute struct {
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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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ExtraSignedAttributes []Attribute
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ExtraUnsignedAttributes []Attribute
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}
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type attributes struct {
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@ -219,9 +151,9 @@ type attributes struct {
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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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func (as *attributes) Add(attrType asn1.ObjectIdentifier, value interface{}) {
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as.types = append(as.types, attrType)
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as.values = append(as.values, value)
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}
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type sortableAttribute struct {
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@ -231,31 +163,31 @@ type sortableAttribute struct {
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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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func (as attributeSet) Len() int {
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return len(as)
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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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func (as attributeSet) Less(i, j int) bool {
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return bytes.Compare(as[i].SortKey, as[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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func (as attributeSet) Swap(i, j int) {
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as[i], as[j] = as[j], as[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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func (as attributeSet) attributes() []attribute {
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attrs := make([]attribute, len(as))
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for i, attr := range as {
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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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func (as *attributes) forMarshaling() ([]attribute, error) {
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sortables := make(attributeSet, len(as.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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attrType := as.types[i]
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attrValue := as.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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@ -277,12 +209,78 @@ func (attrs *attributes) forMarshaling() ([]attribute, error) {
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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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// 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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data []byte
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messageDigest []byte
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digestOid asn1.ObjectIdentifier
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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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sd := signedData{
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ContentInfo: ci,
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Version: 1,
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}
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return &SignedData{sd: sd, data: data, digestOid: OIDDigestAlgorithmSHA256}, nil
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}
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// addSigner is a wrapper around AddSignerChain() that adds a signer without any parent.
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func (sd *SignedData) addSigner(cert *x509.Certificate, pkey crypto.PrivateKey, config SignerInfoConfig) error {
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var parents []*x509.Certificate
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return sd.addSignerChain(cert, pkey, parents, config)
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}
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// addSignerChain signs attributes about the content and adds certificates
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// and signers infos to the Signed Data. The certificate and private key
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// of the end-entity signer are used to issue the signature, and any
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// parent of that end-entity that need to be added to the list of
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// certifications can be specified in the parents slice.
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//
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// The signature algorithm used to hash the data is the one of the end-entity
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// certificate.
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func (sd *SignedData) addSignerChain(ee *x509.Certificate, pkey crypto.PrivateKey, parents []*x509.Certificate, config SignerInfoConfig) error {
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// Following RFC 2315, 9.2 SignerInfo type, the distinguished name of
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// the issuer of the end-entity signer is stored in the issuerAndSerialNumber
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// section of the SignedData.SignerInfo, alongside the serial number of
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// the end-entity.
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var ias issuerAndSerial
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ias.SerialNumber = ee.SerialNumber
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if len(parents) == 0 {
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// no parent, the issuer is the end-entity cert itself
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ias.IssuerName = asn1.RawValue{FullBytes: ee.RawIssuer}
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} else {
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err := verifyPartialChain(ee, parents)
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if err != nil {
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return err
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}
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// the first parent is the issuer
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ias.IssuerName = asn1.RawValue{FullBytes: parents[0].RawSubject}
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}
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sd.sd.DigestAlgorithmIdentifiers = append(sd.sd.DigestAlgorithmIdentifiers,
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pkix.AlgorithmIdentifier{Algorithm: sd.digestOid},
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)
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h := crypto.SHA256.New()
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h.Write(sd.data)
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sd.messageDigest = h.Sum(nil)
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encryptionOid, err := getOIDForEncryptionAlgorithm(pkey, sd.digestOid)
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if err != nil {
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return err
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}
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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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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().UTC())
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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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@ -290,26 +288,32 @@ func (sd *SignedData) addSigner(cert *x509.Certificate, pkey crypto.PrivateKey,
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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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unsignedAttrs := &attributes{}
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for _, attr := range config.ExtraUnsignedAttributes {
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unsignedAttrs.Add(attr.Type, attr.Value)
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}
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finalUnsignedAttrs, err := unsignedAttrs.forMarshaling()
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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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// create signature of signed attributes
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signature, err := signAttributes(finalAttrs, pkey, crypto.SHA256)
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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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UnauthenticatedAttributes: finalUnsignedAttrs,
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DigestAlgorithm: pkix.AlgorithmIdentifier{Algorithm: sd.digestOid},
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DigestEncryptionAlgorithm: pkix.AlgorithmIdentifier{Algorithm: encryptionOid},
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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.certs = append(sd.certs, ee)
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if len(parents) > 0 {
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sd.certs = append(sd.certs, parents...)
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}
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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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@ -322,7 +326,7 @@ func (sd *SignedData) addCertificate(cert *x509.Certificate) {
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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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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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@ -333,20 +337,41 @@ func (sd *SignedData) finish() ([]byte, error) {
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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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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
|
||||
ias.IssuerName = asn1.RawValue{FullBytes: cert.RawIssuer}
|
||||
ias.SerialNumber = cert.SerialNumber
|
||||
// verifyPartialChain checks that a given cert is issued by the first parent in the list,
|
||||
// then continue down the path. It doesn't require the last parent to be a root CA,
|
||||
// or to be trusted in any truststore. It simply verifies that the chain provided, albeit
|
||||
// partial, makes sense.
|
||||
func verifyPartialChain(cert *x509.Certificate, parents []*x509.Certificate) error {
|
||||
if len(parents) == 0 {
|
||||
return fmt.Errorf("pkcs7: zero parents provided to verify the signature of certificate %q", cert.Subject.CommonName)
|
||||
}
|
||||
err := cert.CheckSignatureFrom(parents[0])
|
||||
if err != nil {
|
||||
return fmt.Errorf("pkcs7: certificate signature from parent is invalid: %w", err)
|
||||
}
|
||||
if len(parents) == 1 {
|
||||
// there is no more parent to check, return
|
||||
return nil
|
||||
}
|
||||
return verifyPartialChain(parents[0], parents[1:])
|
||||
}
|
||||
|
||||
return ias, nil
|
||||
// getOIDForEncryptionAlgorithm takes the private key type of the signer and
|
||||
// the OID of a digest algorithm to return the appropriate signerInfo.DigestEncryptionAlgorithm
|
||||
func getOIDForEncryptionAlgorithm(pkey crypto.PrivateKey, OIDDigestAlg asn1.ObjectIdentifier) (asn1.ObjectIdentifier, error) {
|
||||
switch pkey.(type) {
|
||||
case *rsa.PrivateKey:
|
||||
return OIDEncryptionAlgorithmRSASHA256, nil
|
||||
case *ecdsa.PrivateKey:
|
||||
return OIDDigestAlgorithmECDSASHA256, nil
|
||||
}
|
||||
return nil, fmt.Errorf("pkcs7: cannot convert encryption algorithm to oid, unknown private key type %T", pkey)
|
||||
}
|
||||
|
||||
// signs the DER encoded form of the attributes with the private key
|
||||
|
|
@ -360,12 +385,12 @@ func signAttributes(attrs []attribute, pkey crypto.PrivateKey, hash crypto.Hash)
|
|||
hashed := h.Sum(nil)
|
||||
switch priv := pkey.(type) {
|
||||
case *rsa.PrivateKey:
|
||||
return rsa.SignPKCS1v15(rand.Reader, priv, crypto.SHA1, hashed)
|
||||
return rsa.SignPKCS1v15(rand.Reader, priv, crypto.SHA256, hashed)
|
||||
}
|
||||
return nil, ErrUnsupportedAlgorithm
|
||||
}
|
||||
|
||||
// concats and wraps the certificates in the RawValue structure
|
||||
// concat and wraps the certificates in the RawValue structure
|
||||
func marshalCertificates(certs []*x509.Certificate) rawCertificates {
|
||||
var buf bytes.Buffer
|
||||
for _, cert := range certs {
|
||||
|
|
@ -376,7 +401,7 @@ func marshalCertificates(certs []*x509.Certificate) rawCertificates {
|
|||
}
|
||||
|
||||
// Even though, the tag & length are stripped out during marshalling the
|
||||
// RawContent, we have to encode it into the RawContent. If its missing,
|
||||
// RawContent, we have to encode it into the RawContent. If It's missing,
|
||||
// then `asn1.Marshal()` will strip out the certificate wrapper instead.
|
||||
func marshalCertificateBytes(certs []byte) (rawCertificates, error) {
|
||||
val := asn1.RawValue{Bytes: certs, Class: 2, Tag: 0, IsCompound: true}
|
||||
|
|
@ -386,3 +411,42 @@ func marshalCertificateBytes(certs []byte) (rawCertificates, error) {
|
|||
}
|
||||
return rawCertificates{Raw: b}, nil
|
||||
}
|
||||
|
||||
func marshalAttributes(attrs []attribute) ([]byte, error) {
|
||||
encodedAttributes, err := asn1.Marshal(struct {
|
||||
A []attribute `asn1:"set"`
|
||||
}{A: attrs})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Remove the leading sequence octets
|
||||
var raw asn1.RawValue
|
||||
if _, err := asn1.Unmarshal(encodedAttributes, &raw); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return raw.Bytes, nil
|
||||
}
|
||||
|
||||
func getCertFromCertsByIssuerAndSerial(certs []*x509.Certificate, ias issuerAndSerial) *x509.Certificate {
|
||||
for _, cert := range certs {
|
||||
if isCertMatchForIssuerAndSerial(cert, ias) {
|
||||
return cert
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func isCertMatchForIssuerAndSerial(cert *x509.Certificate, ias issuerAndSerial) bool {
|
||||
return cert.SerialNumber.Cmp(ias.SerialNumber) == 0 && bytes.Equal(cert.RawIssuer, ias.IssuerName.FullBytes)
|
||||
}
|
||||
|
||||
func unmarshalAttribute(attrs []attribute, attributeType asn1.ObjectIdentifier, out interface{}) error {
|
||||
for _, attr := range attrs {
|
||||
if attr.Type.Equal(attributeType) {
|
||||
_, err := asn1.Unmarshal(attr.Value.Bytes, out)
|
||||
return err
|
||||
}
|
||||
}
|
||||
return errors.New("pkcs7: attribute type not in attributes")
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue