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feat(sec): Add SSH signing support for instances (#6897)
- Add support to set `gpg.format` in the Git config, via the new `[repository.signing].FORMAT` option. This is to tell Git that the instance would like to use SSH instead of OpenPGP to sign its commits. This is guarded behind a Git version check for v2.34.0 and a check that a `ssh-keygen` binary is present. - Add support to recognize the public SSH key that is given to `[repository.signing].SIGNING_KEY` as the signing key by the instance. - Thus this allows the instance to use SSH commit signing for commits that the instance creates (e.g. initial and squash commits) instead of using PGP. - Technically (although I have no clue how as this is not documented) you can have a different PGP signing key for different repositories; this is not implemented for SSH signing. - Add unit and integration testing. - `TestInstanceSigning` was reworked from `TestGPGGit`, now also includes testing for SHA256 repositories. Is the main integration test that actually signs commits and checks that they are marked as verified by Forgejo. - `TestParseCommitWithSSHSignature` is a unit test that makes sure that if a SSH instnace signing key is set, that it is used to possibly verify instance SSH signed commits. - `TestSyncConfigGPGFormat` is a unit test that makes sure the correct git config is set according to the signing format setting. Also checks that the guarded git version check and ssh-keygen binary presence check is done correctly. - `TestSSHInstanceKey` is a unit test that makes sure the parsing of a SSH signing key is done correctly. - `TestAPISSHSigningKey` is a integration test that makes sure the newly added API route `/api/v1/signing-key.ssh` responds correctly. Documentation PR: forgejo/docs#1122 Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6897 Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org> Co-authored-by: Gusted <postmaster@gusted.xyz> Co-committed-by: Gusted <postmaster@gusted.xyz>
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17 changed files with 687 additions and 306 deletions
59
modules/setting/repository_test.go
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59
modules/setting/repository_test.go
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// Copyright 2025 The Forgejo Authors. All rights reserved.
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// SPDX-License-Identifier: GPL-3.0-or-later
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package setting
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import (
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"fmt"
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"path/filepath"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"golang.org/x/crypto/ssh"
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)
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func TestSSHInstanceKey(t *testing.T) {
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sshSigningKeyPath, err := filepath.Abs("../../tests/integration/ssh-signing-key.pub")
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require.NoError(t, err)
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t.Run("None value", func(t *testing.T) {
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cfg, err := NewConfigProviderFromData(`
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[repository.signing]
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FORMAT = ssh
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SIGNING_KEY = none
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`)
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require.NoError(t, err)
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loadRepositoryFrom(cfg)
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assert.Nil(t, SSHInstanceKey)
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})
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t.Run("No value", func(t *testing.T) {
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cfg, err := NewConfigProviderFromData(`
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[repository.signing]
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FORMAT = ssh
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`)
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require.NoError(t, err)
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loadRepositoryFrom(cfg)
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assert.Nil(t, SSHInstanceKey)
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})
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t.Run("Normal", func(t *testing.T) {
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iniStr := fmt.Sprintf(`
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[repository.signing]
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FORMAT = ssh
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SIGNING_KEY = %s
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`, sshSigningKeyPath)
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cfg, err := NewConfigProviderFromData(iniStr)
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require.NoError(t, err)
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loadRepositoryFrom(cfg)
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assert.NotNil(t, SSHInstanceKey)
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assert.Equal(t, "ssh-ed25519", SSHInstanceKey.Type())
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assert.EqualValues(t, "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFeRC8GfFyXtiy0f1E7hLv77BXW7e68tFvIcs8/29YqH\n", ssh.MarshalAuthorizedKey(SSHInstanceKey))
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})
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}
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