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feat: provide more client PGP functions
This was a bit refactored for easier access. Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
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| // Package client provides utilities for handling client-side PGP keys. | ||
| package client |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
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| package client | ||
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| import ( | ||
| "github.com/siderolabs/go-api-signature/pkg/pgp" | ||
| ) | ||
|
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| // Key represents an OpenPGP client key pair associated with a context and an identity. | ||
| // It is stored on the filesystem. | ||
| type Key struct { | ||
| *pgp.Key | ||
| context string | ||
| identity string | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
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| package client | ||
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| import ( | ||
| "fmt" | ||
| "os" | ||
| "path/filepath" | ||
| "runtime" | ||
| "time" | ||
|
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| pgpcrypto "github.com/ProtonMail/gopenpgp/v2/crypto" | ||
| "github.com/adrg/xdg" | ||
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| "github.com/siderolabs/go-api-signature/pkg/pgp" | ||
| ) | ||
|
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| const ( | ||
| keyLifetime = 4 * time.Hour | ||
| ) | ||
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| // KeyProvider handles loading/saving client keys. | ||
| type KeyProvider struct { | ||
| dataFileDirectory string | ||
| keyLifetime time.Duration | ||
| } | ||
|
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| // NewKeyProvider creates a new KeyProvider. | ||
| func NewKeyProvider(dataFileDirectory string) *KeyProvider { | ||
| return &KeyProvider{ | ||
| dataFileDirectory: dataFileDirectory, | ||
| keyLifetime: keyLifetime, | ||
| } | ||
| } | ||
|
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| // ReadValidKey reads a PGP key from the filesystem. | ||
| // | ||
| // If the key is missing or invalid (e.g. expired, revoked), an error will be returned. | ||
| func (provider *KeyProvider) ReadValidKey(context, email string) (*Key, error) { | ||
| keyPath, err := provider.getKeyFilePath(context, email) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| keyF, err := os.Open(keyPath) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| defer keyF.Close() //nolint:errcheck | ||
|
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| key, err := pgpcrypto.NewKeyFromArmoredReader(keyF) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| pgpKey, err := pgp.NewKey(key) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| err = pgpKey.Validate() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| unlocked, err := pgpKey.IsUnlocked() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| if !unlocked { | ||
| return nil, fmt.Errorf("private key is locked") | ||
| } | ||
|
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| return &Key{ | ||
| Key: pgpKey, | ||
| context: context, | ||
| identity: email, | ||
| }, nil | ||
| } | ||
|
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| // GenerateKey generates a new PGP key pair. | ||
| func (provider *KeyProvider) GenerateKey(context, email, clientNameWithVersion string) (*Key, error) { | ||
| name := clientNameWithVersion | ||
| comment := fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH) | ||
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| key, err := pgp.GenerateKey(name, comment, email, provider.keyLifetime) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| return &Key{ | ||
| Key: key, | ||
| context: context, | ||
| identity: email, | ||
| }, nil | ||
| } | ||
|
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| // DeleteKey deletes the key pair from disk. | ||
| func (provider *KeyProvider) DeleteKey(context, email string) error { | ||
| keyPath, err := provider.getKeyFilePath(context, email) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| return os.Remove(keyPath) | ||
| } | ||
|
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| // WriteKey saves the key pair to disk and returns the save path. | ||
| func (provider *KeyProvider) WriteKey(c *Key) (string, error) { | ||
| armored, err := c.Armor() | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| keyPath, err := provider.getKeyFilePath(c.context, c.identity) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| err = os.WriteFile(keyPath, []byte(armored), 0o600) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| return keyPath, err | ||
| } | ||
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| func (provider *KeyProvider) getKeyFilePath(context, identity string) (string, error) { | ||
| keyName := fmt.Sprintf("%s-%s.pgp", context, identity) | ||
|
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| return xdg.DataFile(filepath.Join(provider.dataFileDirectory, keyName)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
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| package client_test | ||
|
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| import ( | ||
| "testing" | ||
|
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| "github.com/adrg/xdg" | ||
| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
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| "github.com/siderolabs/go-api-signature/pkg/pgp/client" | ||
| ) | ||
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| func TestKeyProvider(t *testing.T) { | ||
| t.Cleanup(xdg.Reload) | ||
|
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| // fake XDG paths | ||
| t.Setenv("HOME", t.TempDir()) | ||
| xdg.Reload() | ||
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| provider := client.NewKeyProvider("test/keys") | ||
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| key, err := provider.GenerateKey("testapp", "john@example.com", "Linux") | ||
| require.NoError(t, err) | ||
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| assert.True(t, key.IsPrivate()) | ||
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| path, err := provider.WriteKey(key) | ||
| require.NoError(t, err) | ||
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| t.Logf("saved key to %s", path) | ||
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| k, err := provider.ReadValidKey("testapp", "john@example.com") | ||
| require.NoError(t, err) | ||
|
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| assert.True(t, k.IsPrivate()) | ||
|
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| err = provider.DeleteKey("testapp", "john@example.com") | ||
| require.NoError(t, err) | ||
|
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| _, err = provider.ReadValidKey("testapp", "john@example.com") | ||
| require.Error(t, err) | ||
| } |
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