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Remove replace directive for github.com/github/smimesign
This forks the changes made in github/smimesign#108 into this repo. This was done because the replace directive was preventing go install from functioning properly. Once the upstream PR is merged, we can revert this change.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| package signature | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto" | ||
| "crypto/x509" | ||
| "encoding/pem" | ||
|
|
||
| cms "github.com/github/smimesign/ietf-cms" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| type SignOptions struct { | ||
| // Make a detached signature | ||
| Detached bool | ||
| // URL of RFC3161 timestamp authority to use for timestamping | ||
| TimestampAuthority string | ||
| // Create ascii armored output | ||
| Armor bool | ||
| // IncludeCerts specifies what certs to include in the resulting signature. | ||
| // -3 is the same as -2, but ommits issuer when cert has Authority Information Access extension. | ||
| // -2 includes all certs except root. | ||
| // -1 includes all certs. | ||
| // 0 includes no certs. | ||
| // 1 includes leaf cert. | ||
| // >1 includes n from the leaf. | ||
| IncludeCerts int | ||
| } | ||
|
|
||
| // Identity is a copy of smimesign.Identity to allow for compatibility without | ||
| // needing a dependency on the whole package. This can be removed once | ||
| // https://github.com/github/smimesign/pull/108 is merged. | ||
| type Identity interface { | ||
| // Certificate gets the identity's certificate. | ||
| Certificate() (*x509.Certificate, error) | ||
| // CertificateChain attempts to get the identity's full certificate chain. | ||
| CertificateChain() ([]*x509.Certificate, error) | ||
| // Signer gets a crypto.Signer that uses the identity's private key. | ||
| Signer() (crypto.Signer, error) | ||
| // Delete deletes this identity from the system. | ||
| Delete() error | ||
| // Close any manually managed memory held by the Identity. | ||
| Close() | ||
| } | ||
|
|
||
| // Sign signs a given payload for the given identity. | ||
| // The resulting signature and cert used is returned. | ||
| func Sign(ident Identity, body []byte, opts SignOptions) ([]byte, *x509.Certificate, error) { | ||
| cert, err := ident.Certificate() | ||
| if err != nil { | ||
| return nil, nil, errors.Wrap(err, "failed to get idenity certificate") | ||
| } | ||
| signer, err := ident.Signer() | ||
| if err != nil { | ||
| return nil, nil, errors.Wrap(err, "failed to get idenity signer") | ||
| } | ||
|
|
||
| sd, err := cms.NewSignedData(body) | ||
| if err != nil { | ||
| return nil, nil, errors.Wrap(err, "failed to create signed data") | ||
| } | ||
|
|
||
| if err := sd.Sign([]*x509.Certificate{cert}, signer); err != nil { | ||
| return nil, nil, errors.Wrap(err, "failed to sign message") | ||
| } | ||
| if opts.Detached { | ||
| sd.Detached() | ||
| } | ||
|
|
||
| if len(opts.TimestampAuthority) > 0 { | ||
| if err = sd.AddTimestamps(opts.TimestampAuthority); err != nil { | ||
| return nil, nil, errors.Wrap(err, "failed to add timestamp") | ||
| } | ||
| } | ||
|
|
||
| chain, err := ident.CertificateChain() | ||
| if err != nil { | ||
| return nil, nil, errors.Wrap(err, "failed to get idenity certificate chain") | ||
| } | ||
| if chain, err = certsForSignature(chain, opts.IncludeCerts); err != nil { | ||
| return nil, nil, err | ||
| } | ||
| if err := sd.SetCertificates(chain); err != nil { | ||
| return nil, nil, errors.Wrap(err, "failed to set certificates") | ||
| } | ||
|
|
||
| der, err := sd.ToDER() | ||
| if err != nil { | ||
| return nil, nil, errors.Wrap(err, "failed to serialize signature") | ||
| } | ||
|
|
||
| if opts.Armor { | ||
| return pem.EncodeToMemory(&pem.Block{ | ||
| Type: "SIGNED MESSAGE", | ||
| Bytes: der, | ||
| }), cert, nil | ||
| } else { | ||
| return der, cert, nil | ||
| } | ||
| } | ||
|
|
||
| // certsForSignature determines which certificates to include in the signature | ||
| // based on the --include-certs option specified by the user. | ||
| func certsForSignature(chain []*x509.Certificate, include int) ([]*x509.Certificate, error) { | ||
| if include < -3 { | ||
| include = -2 // default | ||
| } | ||
| if include > len(chain) { | ||
| include = len(chain) | ||
| } | ||
|
|
||
| switch include { | ||
| case -3: | ||
| for i := len(chain) - 1; i > 0; i-- { | ||
| issuer, cert := chain[i], chain[i-1] | ||
|
|
||
| // remove issuer when cert has AIA extension | ||
| if bytes.Equal(issuer.RawSubject, cert.RawIssuer) && len(cert.IssuingCertificateURL) > 0 { | ||
| chain = chain[0:i] | ||
| } | ||
| } | ||
| return chainWithoutRoot(chain), nil | ||
| case -2: | ||
| return chainWithoutRoot(chain), nil | ||
| case -1: | ||
| return chain, nil | ||
| default: | ||
| return chain[0:include], nil | ||
| } | ||
| } | ||
|
|
||
| // Returns the provided chain, having removed the root certificate, if present. | ||
| // This includes removing the cert itself if the chain is a single self-signed | ||
| // cert. | ||
| func chainWithoutRoot(chain []*x509.Certificate) []*x509.Certificate { | ||
| if len(chain) == 0 { | ||
| return chain | ||
| } | ||
|
|
||
| lastIdx := len(chain) - 1 | ||
| last := chain[lastIdx] | ||
|
|
||
| if bytes.Equal(last.RawIssuer, last.RawSubject) { | ||
| return chain[0:lastIdx] | ||
| } | ||
|
|
||
| return chain | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| package signature | ||
|
|
||
| import ( | ||
| "crypto" | ||
| "crypto/x509" | ||
| "fmt" | ||
| "testing" | ||
|
|
||
| "github.com/github/smimesign/fakeca" | ||
| ) | ||
|
|
||
| type identity struct { | ||
| Identity | ||
| base *fakeca.Identity | ||
| } | ||
|
|
||
| func (i *identity) Certificate() (*x509.Certificate, error) { | ||
| return i.base.Certificate, nil | ||
| } | ||
|
|
||
| func (i *identity) CertificateChain() ([]*x509.Certificate, error) { | ||
| return i.base.Chain(), nil | ||
| } | ||
|
|
||
| func (i *identity) Signer() (crypto.Signer, error) { | ||
| return i.base.PrivateKey, nil | ||
| } | ||
|
|
||
| // TestSignVerify is a basic test to ensure that the Sign/Verify funcs can be | ||
| // used with each other. We're assuming that the actual signature format has | ||
| // been more thoroghly vetted in other packages (i.e. ietf-cms). | ||
| func TestSignVerify(t *testing.T) { | ||
| id := &identity{ | ||
| base: fakeca.New(), | ||
| } | ||
| data := []byte("tacocat") | ||
|
|
||
| sig, _, err := Sign(id, data, SignOptions{ | ||
| Detached: true, | ||
| Armor: true, | ||
| // Fake CA outputs self-signed certs, so we need to use -1 to make sure | ||
| // the self-signed cert itself is included in the chain, otherwise | ||
| // Verify cannot find a cert to use for verification. | ||
| IncludeCerts: -1, | ||
| }) | ||
| if err != nil { | ||
| t.Fatalf("Sign() = %v", err) | ||
| } | ||
|
|
||
| fmt.Println(id.base.Chain()) | ||
| if _, err := Verify(data, sig, true, x509.VerifyOptions{ | ||
| // Trust the fake CA | ||
| Roots: id.base.ChainPool(), | ||
| }); err != nil { | ||
| t.Fatalf("Verify() = %v", err) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| package signature | ||
|
|
||
| import ( | ||
| "crypto/x509" | ||
| "encoding/pem" | ||
|
|
||
| cms "github.com/github/smimesign/ietf-cms" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| // Verify verifies a signature for a given identity. | ||
| // | ||
| // WARNING: this function doesn't do any revocation checking. | ||
| func Verify(body, sig []byte, detached bool, opts x509.VerifyOptions) ([][][]*x509.Certificate, error) { | ||
| // Try decoding as PEM | ||
| var der []byte | ||
| if blk, _ := pem.Decode(sig); blk != nil { | ||
| der = blk.Bytes | ||
| } else { | ||
| der = sig | ||
| } | ||
|
|
||
| // Parse signature | ||
| sd, err := cms.ParseSignedData(der) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "failed to parse signature") | ||
| } | ||
|
|
||
| if detached { | ||
| return sd.VerifyDetached(body, opts) | ||
| } else { | ||
| return sd.Verify(opts) | ||
| } | ||
| } |