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-rw-r--r--plumbing/hash/hash.go6
-rw-r--r--plumbing/object/signature.go101
-rw-r--r--plumbing/object/signature_test.go180
-rw-r--r--plumbing/object/tag.go37
-rw-r--r--plumbing/object/tag_test.go21
5 files changed, 309 insertions, 36 deletions
diff --git a/plumbing/hash/hash.go b/plumbing/hash/hash.go
index fe3bf76..80e4b5f 100644
--- a/plumbing/hash/hash.go
+++ b/plumbing/hash/hash.go
@@ -7,7 +7,7 @@ import (
"fmt"
"hash"
- "github.com/pjbgf/sha1cd/cgo"
+ "github.com/pjbgf/sha1cd"
)
// algos is a map of hash algorithms.
@@ -20,9 +20,7 @@ func init() {
// reset resets the default algos value. Can be used after running tests
// that registers new algorithms to avoid side effects.
func reset() {
- // For performance reasons the cgo version of the collision
- // detection algorithm is being used.
- algos[crypto.SHA1] = cgo.New
+ algos[crypto.SHA1] = sha1cd.New
}
// RegisterHash allows for the hash algorithm used to be overriden.
diff --git a/plumbing/object/signature.go b/plumbing/object/signature.go
new file mode 100644
index 0000000..91cf371
--- /dev/null
+++ b/plumbing/object/signature.go
@@ -0,0 +1,101 @@
+package object
+
+import "bytes"
+
+const (
+ signatureTypeUnknown signatureType = iota
+ signatureTypeOpenPGP
+ signatureTypeX509
+ signatureTypeSSH
+)
+
+var (
+ // openPGPSignatureFormat is the format of an OpenPGP signature.
+ openPGPSignatureFormat = signatureFormat{
+ []byte("-----BEGIN PGP SIGNATURE-----"),
+ []byte("-----BEGIN PGP MESSAGE-----"),
+ }
+ // x509SignatureFormat is the format of an X509 signature, which is
+ // a PKCS#7 (S/MIME) signature.
+ x509SignatureFormat = signatureFormat{
+ []byte("-----BEGIN CERTIFICATE-----"),
+ }
+
+ // sshSignatureFormat is the format of an SSH signature.
+ sshSignatureFormat = signatureFormat{
+ []byte("-----BEGIN SSH SIGNATURE-----"),
+ }
+)
+
+var (
+ // knownSignatureFormats is a map of known signature formats, indexed by
+ // their signatureType.
+ knownSignatureFormats = map[signatureType]signatureFormat{
+ signatureTypeOpenPGP: openPGPSignatureFormat,
+ signatureTypeX509: x509SignatureFormat,
+ signatureTypeSSH: sshSignatureFormat,
+ }
+)
+
+// signatureType represents the type of the signature.
+type signatureType int8
+
+// signatureFormat represents the beginning of a signature.
+type signatureFormat [][]byte
+
+// typeForSignature returns the type of the signature based on its format.
+func typeForSignature(b []byte) signatureType {
+ for t, i := range knownSignatureFormats {
+ for _, begin := range i {
+ if bytes.HasPrefix(b, begin) {
+ return t
+ }
+ }
+ }
+ return signatureTypeUnknown
+}
+
+// parseSignedBytes returns the position of the last signature block found in
+// the given bytes. If no signature block is found, it returns -1.
+//
+// When multiple signature blocks are found, the position of the last one is
+// returned. Any tailing bytes after this signature block start should be
+// considered part of the signature.
+//
+// Given this, it would be safe to use the returned position to split the bytes
+// into two parts: the first part containing the message, the second part
+// containing the signature.
+//
+// Example:
+//
+// message := []byte(`Message with signature
+//
+// -----BEGIN SSH SIGNATURE-----
+// ...`)
+//
+// var signature string
+// if pos, _ := parseSignedBytes(message); pos != -1 {
+// signature = string(message[pos:])
+// message = message[:pos]
+// }
+//
+// This logic is on par with git's gpg-interface.c:parse_signed_buffer().
+// https://github.com/git/git/blob/7c2ef319c52c4997256f5807564523dfd4acdfc7/gpg-interface.c#L668
+func parseSignedBytes(b []byte) (int, signatureType) {
+ var n, match = 0, -1
+ var t signatureType
+ for n < len(b) {
+ var i = b[n:]
+ if st := typeForSignature(i); st != signatureTypeUnknown {
+ match = n
+ t = st
+ }
+ if eol := bytes.IndexByte(i, '\n'); eol >= 0 {
+ n += eol + 1
+ continue
+ }
+ // If we reach this point, we've reached the end.
+ break
+ }
+ return match, t
+}
diff --git a/plumbing/object/signature_test.go b/plumbing/object/signature_test.go
new file mode 100644
index 0000000..1bdb1d1
--- /dev/null
+++ b/plumbing/object/signature_test.go
@@ -0,0 +1,180 @@
+package object
+
+import (
+ "bytes"
+ "testing"
+)
+
+func Test_typeForSignature(t *testing.T) {
+ tests := []struct {
+ name string
+ b []byte
+ want signatureType
+ }{
+ {
+ name: "known signature format (PGP)",
+ b: []byte(`-----BEGIN PGP SIGNATURE-----
+
+iHUEABYKAB0WIQTMqU0ycQ3f6g3PMoWMmmmF4LuV8QUCYGebVwAKCRCMmmmF4LuV
+8VtyAP9LbuXAhtK6FQqOjKybBwlV70rLcXVP24ubDuz88VVwSgD+LuObsasWq6/U
+TssDKHUR2taa53bQYjkZQBpvvwOrLgc=
+=YQUf
+-----END PGP SIGNATURE-----`),
+ want: signatureTypeOpenPGP,
+ },
+ {
+ name: "known signature format (SSH)",
+ b: []byte(`-----BEGIN SSH SIGNATURE-----
+U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgij/EfHS8tCjolj5uEANXgKzFfp
+0D7wOhjWVbYZH6KugAAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5
+AAAAQIYHMhSVV9L2xwJuV8eWMLjThya8yXgCHDzw3p01D19KirrabW0veiichPB5m+Ihtr
+MKEQruIQWJb+8HVXwssA4=
+-----END SSH SIGNATURE-----`),
+ want: signatureTypeSSH,
+ },
+ {
+ name: "known signature format (X509)",
+ b: []byte(`-----BEGIN CERTIFICATE-----
+MIIDZjCCAk6gAwIBAgIJALZ9Z3Z9Z3Z9MA0GCSqGSIb3DQEBCwUAMIGIMQswCQYD
+VQQGEwJTRTEOMAwGA1UECAwFVGV4YXMxDjAMBgNVBAcMBVRleGFzMQ4wDAYDVQQK
+DAVUZXhhczEOMAwGA1UECwwFVGV4YXMxGDAWBgNVBAMMD1RleGFzIENlcnRpZmlj
+YXRlMB4XDTE3MDUyNjE3MjY0MloXDTI3MDUyNDE3MjY0MlowgYgxCzAJBgNVBAYT
+AlNFMQ4wDAYDVQQIDAVUZXhhczEOMAwGA1UEBwwFVGV4YXMxDjAMBgNVBAoMBVRl
+eGFzMQ4wDAYDVQQLDAVUZXhhczEYMBYGA1UEAwwPVGV4YXMgQ2VydGlmaWNhdGUw
+ggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDQZ9Z3Z9Z3Z9Z3Z9Z3Z9Z3
+-----END CERTIFICATE-----`),
+ want: signatureTypeX509,
+ },
+ {
+ name: "unknown signature format",
+ b: []byte(`-----BEGIN ARBITRARY SIGNATURE-----
+U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgij/EfHS8tCjolj5uEANXgKzFfp
+-----END UNKNOWN SIGNATURE-----`),
+ want: signatureTypeUnknown,
+ },
+ }
+ for _, tt := range tests {
+ t.Run(tt.name, func(t *testing.T) {
+ if got := typeForSignature(tt.b); got != tt.want {
+ t.Errorf("typeForSignature() = %v, want %v", got, tt.want)
+ }
+ })
+ }
+}
+
+func Test_parseSignedBytes(t *testing.T) {
+ tests := []struct {
+ name string
+ b []byte
+ wantSignature []byte
+ wantType signatureType
+ }{
+ {
+ name: "detects signature and type",
+ b: []byte(`signed tag
+-----BEGIN PGP SIGNATURE-----
+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+=VhHy
+-----END PGP SIGNATURE-----`),
+ wantSignature: []byte(`-----BEGIN PGP SIGNATURE-----
+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+=VhHy
+-----END PGP SIGNATURE-----`),
+ wantType: signatureTypeOpenPGP,
+ },
+ {
+ name: "last signature for multiple signatures",
+ b: []byte(`signed tag
+-----BEGIN PGP SIGNATURE-----
+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+=VhHy
+-----END PGP SIGNATURE-----
+-----BEGIN SSH SIGNATURE-----
+U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgij/EfHS8tCjolj5uEANXgKzFfp
+0D7wOhjWVbYZH6KugAAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5
+AAAAQIYHMhSVV9L2xwJuV8eWMLjThya8yXgCHDzw3p01D19KirrabW0veiichPB5m+Ihtr
+MKEQruIQWJb+8HVXwssA4=
+-----END SSH SIGNATURE-----`),
+ wantSignature: []byte(`-----BEGIN SSH SIGNATURE-----
+U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgij/EfHS8tCjolj5uEANXgKzFfp
+0D7wOhjWVbYZH6KugAAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5
+AAAAQIYHMhSVV9L2xwJuV8eWMLjThya8yXgCHDzw3p01D19KirrabW0veiichPB5m+Ihtr
+MKEQruIQWJb+8HVXwssA4=
+-----END SSH SIGNATURE-----`),
+ wantType: signatureTypeSSH,
+ },
+ {
+ name: "signature with trailing data",
+ b: []byte(`An invalid
+
+-----BEGIN SSH SIGNATURE-----
+U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgij/EfHS8tCjolj5uEANXgKzFfp
+0D7wOhjWVbYZH6KugAAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5
+AAAAQIYHMhSVV9L2xwJuV8eWMLjThya8yXgCHDzw3p01D19KirrabW0veiichPB5m+Ihtr
+MKEQruIQWJb+8HVXwssA4=
+-----END SSH SIGNATURE-----
+
+signed tag`),
+ wantSignature: []byte(`-----BEGIN SSH SIGNATURE-----
+U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgij/EfHS8tCjolj5uEANXgKzFfp
+0D7wOhjWVbYZH6KugAAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5
+AAAAQIYHMhSVV9L2xwJuV8eWMLjThya8yXgCHDzw3p01D19KirrabW0veiichPB5m+Ihtr
+MKEQruIQWJb+8HVXwssA4=
+-----END SSH SIGNATURE-----
+
+signed tag`),
+ wantType: signatureTypeSSH,
+ },
+ {
+ name: "data without signature",
+ b: []byte(`Some message`),
+ wantSignature: []byte(``),
+ wantType: signatureTypeUnknown,
+ },
+ }
+ for _, tt := range tests {
+ t.Run(tt.name, func(t *testing.T) {
+ pos, st := parseSignedBytes(tt.b)
+ var signature []byte
+ if pos >= 0 {
+ signature = tt.b[pos:]
+ }
+ if !bytes.Equal(signature, tt.wantSignature) {
+ t.Errorf("parseSignedBytes() got = %s for pos = %v, want %s", signature, pos, tt.wantSignature)
+ }
+ if st != tt.wantType {
+ t.Errorf("parseSignedBytes() got1 = %v, want %v", st, tt.wantType)
+ }
+ })
+ }
+}
diff --git a/plumbing/object/tag.go b/plumbing/object/tag.go
index 84066f7..cf46c08 100644
--- a/plumbing/object/tag.go
+++ b/plumbing/object/tag.go
@@ -4,11 +4,9 @@ import (
"bytes"
"fmt"
"io"
- stdioutil "io/ioutil"
"strings"
"github.com/ProtonMail/go-crypto/openpgp"
-
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/storer"
"github.com/go-git/go-git/v5/utils/ioutil"
@@ -128,40 +126,15 @@ func (t *Tag) Decode(o plumbing.EncodedObject) (err error) {
}
}
- data, err := stdioutil.ReadAll(r)
+ data, err := io.ReadAll(r)
if err != nil {
return err
}
-
- var pgpsig bool
- // Check if data contains PGP signature.
- if bytes.Contains(data, []byte(beginpgp)) {
- // Split the lines at newline.
- messageAndSig := bytes.Split(data, []byte("\n"))
-
- for _, l := range messageAndSig {
- if pgpsig {
- if bytes.Contains(l, []byte(endpgp)) {
- t.PGPSignature += endpgp + "\n"
- break
- } else {
- t.PGPSignature += string(l) + "\n"
- }
- continue
- }
-
- // Check if it's the beginning of a PGP signature.
- if bytes.Contains(l, []byte(beginpgp)) {
- t.PGPSignature += beginpgp + "\n"
- pgpsig = true
- continue
- }
-
- t.Message += string(l) + "\n"
- }
- } else {
- t.Message = string(data)
+ if sm, _ := parseSignedBytes(data); sm >= 0 {
+ t.PGPSignature = string(data[sm:])
+ data = data[:sm]
}
+ t.Message = string(data)
return nil
}
diff --git a/plumbing/object/tag_test.go b/plumbing/object/tag_test.go
index cd1d15d..15b943e 100644
--- a/plumbing/object/tag_test.go
+++ b/plumbing/object/tag_test.go
@@ -312,6 +312,27 @@ RUysgqjcpT8+iQM1PblGfHR4XAhuOqN5Fx06PSaFZhqvWFezJ28/CLyX5q+oIVk=
c.Assert(decoded.PGPSignature, Equals, pgpsignature)
}
+func (s *TagSuite) TestSSHSignatureSerialization(c *C) {
+ encoded := &plumbing.MemoryObject{}
+ decoded := &Tag{}
+ tag := s.tag(c, plumbing.NewHash("b742a2a9fa0afcfa9a6fad080980fbc26b007c69"))
+
+ signature := `-----BEGIN SSH SIGNATURE-----
+U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgij/EfHS8tCjolj5uEANXgKzFfp
+0D7wOhjWVbYZH6KugAAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5
+AAAAQIYHMhSVV9L2xwJuV8eWMLjThya8yXgCHDzw3p01D19KirrabW0veiichPB5m+Ihtr
+MKEQruIQWJb+8HVXwssA4=
+-----END SSH SIGNATURE-----`
+ tag.PGPSignature = signature
+
+ err := tag.Encode(encoded)
+ c.Assert(err, IsNil)
+
+ err = decoded.Decode(encoded)
+ c.Assert(err, IsNil)
+ c.Assert(decoded.PGPSignature, Equals, signature)
+}
+
func (s *TagSuite) TestVerify(c *C) {
ts := time.Unix(1617403017, 0)
loc, _ := time.LoadLocation("UTC")
generated by cgit (git 2.34.1) at 2024-09-21 18:07:41 +0000