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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| package liboidcagent | ||
|
|
||
| import ( | ||
| "crypto/rand" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "golang.org/x/crypto/nacl/box" | ||
| ) | ||
|
|
||
| func communicateWithSock(c net.Conn, request string) (response []byte, err error) { | ||
| _, err = c.Write([]byte(request)) | ||
| if err != nil { | ||
| err = fmt.Errorf("Writing to socket: %s", err) | ||
| return | ||
| } | ||
| for { | ||
| buffer := make([]byte, 4096) | ||
| n, e := c.Read(buffer) | ||
| response = append(response, buffer[:n]...) | ||
| if n < 4096 || e != nil { | ||
| err = e | ||
| break | ||
| } | ||
| } | ||
| if err != nil { | ||
| err = fmt.Errorf("Reading from socket: %s", err) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func initCommunication(remote bool) (c net.Conn, err error) { | ||
| envVar := "OIDC_SOCK" | ||
| sockType := "unix" | ||
| if remote { | ||
| envVar = "OIDC_REMOTE_SOCK" | ||
| sockType = "tcp" | ||
| } | ||
| socketValue, socketSet := os.LookupEnv(envVar) | ||
| if !socketSet { | ||
| err = fmt.Errorf("$%s not set", envVar) | ||
| return | ||
| } | ||
|
|
||
| if remote { | ||
| if _, port, _ := net.SplitHostPort(socketValue); port == "" { | ||
| socketValue = fmt.Sprintf("%s:%d", socketValue, 42424) | ||
| } | ||
| } | ||
|
|
||
| c, err = net.Dial(sockType, socketValue) | ||
| if err != nil { | ||
| err = fmt.Errorf("Dialing socket: %s", err) | ||
| return | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func communicatePlain(remote bool, request string) (response string, err error) { | ||
| c, err := initCommunication(remote) | ||
| if err != nil { | ||
| return | ||
| } | ||
| defer c.Close() | ||
|
|
||
| res, err := communicateWithSock(c, request) | ||
| response = string(res) | ||
| return | ||
| } | ||
|
|
||
| func communicateEncrypted(remote bool, request string) (response string, err error) { | ||
| c, err := initCommunication(remote) | ||
| if err != nil { | ||
| return | ||
| } | ||
| defer c.Close() | ||
|
|
||
| clientPrivateKey, _, serverPublicKey, err := initKeys(c) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| encryptedMsg, err := encryptMessage(request, serverPublicKey, clientPrivateKey) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| encryptedResponse, err := communicateWithSock(c, encryptedMsg) | ||
| if err != nil { | ||
| return | ||
| } | ||
| encryptedResponseStr := string(encryptedResponse) | ||
| if isJSON(encryptedResponseStr) { | ||
| // response not encrypted | ||
| response = encryptedResponseStr | ||
| return | ||
| } | ||
|
|
||
| response, err = decryptMessage(encryptedResponseStr, serverPublicKey, clientPrivateKey) | ||
| return | ||
| } | ||
|
|
||
| func initKeys(c net.Conn) (clientPrivateKey, clientPublicKey, serverPublicKey *[32]byte, err error) { | ||
| clientPublicKey, clientPrivateKey, err = box.GenerateKey(rand.Reader) | ||
| if err != nil { | ||
| return | ||
| } | ||
| clientPubKeyBase64 := base64.StdEncoding.EncodeToString(clientPublicKey[:]) | ||
| serverPubKeyBase64, err := communicateWithSock(c, clientPubKeyBase64) | ||
| if err != nil { | ||
| return | ||
| } | ||
| serverPubKeyB, err := decodeBytes(serverPubKeyBase64) | ||
| if err != nil { | ||
| return | ||
| } | ||
| serverPublicKey = sliceToArray32(serverPubKeyB) | ||
| return | ||
| } | ||
|
|
||
| func encryptMessage(message string, serverPublicKey, clientPrivateKey *[32]byte) (string, error) { | ||
| var nonce [24]byte | ||
| if _, err := io.ReadFull(rand.Reader, nonce[:]); err != nil { | ||
| return "", err | ||
| } | ||
| encrypted := box.Seal([]byte{}, []byte(message), &nonce, serverPublicKey, clientPrivateKey) | ||
| encryptedBase64 := base64.StdEncoding.EncodeToString(encrypted) | ||
| nonceBase64 := base64.StdEncoding.EncodeToString(nonce[:]) | ||
| msgLen := len(message) | ||
| encryptedMsg := fmt.Sprintf("%d:%s:%s", msgLen, nonceBase64, encryptedBase64) | ||
| return encryptedMsg, nil | ||
| } | ||
|
|
||
| func decryptMessage(message string, serverPublicKey, clientPrivateKey *[32]byte) (decrypted string, err error) { | ||
| split := strings.Split(message, ":") | ||
| nonce, err := base64.StdEncoding.DecodeString(split[1]) | ||
| if err != nil { | ||
| return | ||
| } | ||
| encryptedRes, err := base64.StdEncoding.DecodeString(split[2]) | ||
| if err != nil { | ||
| return | ||
| } | ||
| res, ok := box.Open([]byte{}, encryptedRes, sliceToArray24(nonce), serverPublicKey, clientPrivateKey) | ||
| decrypted = string(res) | ||
| if !ok { | ||
| err = fmt.Errorf("Decryption error") | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func sliceToArray32(slice []byte) *[32]byte { | ||
| arr := [32]byte{} | ||
| copy(arr[:], slice) | ||
| return &arr | ||
| } | ||
|
|
||
| func sliceToArray24(slice []byte) *[24]byte { | ||
| arr := [24]byte{} | ||
| copy(arr[:], slice) | ||
| return &arr | ||
| } | ||
|
|
||
| func decodeBytes(src []byte) ([]byte, error) { | ||
| out := make([]byte, base64.StdEncoding.DecodedLen(len(src))) | ||
| n, err := base64.StdEncoding.Decode(out, src) | ||
| return out[:n], err | ||
| } | ||
|
|
||
| func isJSON(s string) bool { | ||
| var js map[string]interface{} | ||
| return json.Unmarshal([]byte(s), &js) == nil | ||
| } |
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