Add Go SDK implementation

sdk/go/README.md

@@ -0,0 +1,61 @@
+# Go SDK
+
+The DStack SDK for Go.
+
+# Installation
+
+```bash
+go get github.com/Dstack-TEE/dstack/sdk/go
+```
+
+# Usage
+
+```go
+package main
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+
+	"github.com/Dstack-TEE/dstack/sdk/go/tappd"
+)
+
+func main() {
+	client := tappd.NewTappdClient(
+		// tappd.WithEndpoint("http://localhost"),
+		// tappd.WithLogger(slog.Default()),
+	)
+
+	deriveKeyResp, err := client.DeriveKey(context.Background(), "/", "test", nil)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	fmt.Println(deriveKeyResp) // &{-----BEGIN PRIVATE KEY--- ...
+
+	tdxQuoteResp, err := client.TdxQuote(context.Background(), []byte("test"))
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	fmt.Println(tdxQuoteResp) // &{0x0000000000000000000 ...
+
+	rtmrs, err := tdxQuoteResp.ReplayRTMRs()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	fmt.Println(rtmrs) // map[0:00000000000000000 ...
+}
+```
+
+# For Development
+
+Set up [Go](https://go.dev/doc/install).
+
+Running the unit tests with local simulator via `/tmp/tappd.sock`:
+
+```bash
+DSTACK_SIMULATOR_ENDPOINT=/tmp/tappd.sock go test ./...
+```

sdk/go/go.mod

@@ -0,0 +1,3 @@
+module github.com/Dstack-TEE/dstack/sdk/go
+
+go 1.21.6

sdk/go/tappd/client.go

@@ -0,0 +1,281 @@
+package tappd
+
+import (
+	"bytes"
+	"context"
+	"crypto/sha512"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log/slog"
+	"net"
+	"net/http"
+	"os"
+	"strings"
+)
+
+// Represents the hash algorithm used in TDX quote generation.
+type QuoteHashAlgorithm string
+
+const (
+	SHA256    QuoteHashAlgorithm = "sha256"
+	SHA384    QuoteHashAlgorithm = "sha384"
+	SHA512    QuoteHashAlgorithm = "sha512"
+	SHA3_256  QuoteHashAlgorithm = "sha3-256"
+	SHA3_384  QuoteHashAlgorithm = "sha3-384"
+	SHA3_512  QuoteHashAlgorithm = "sha3-512"
+	KECCAK256 QuoteHashAlgorithm = "keccak256"
+	KECCAK384 QuoteHashAlgorithm = "keccak384"
+	KECCAK512 QuoteHashAlgorithm = "keccak512"
+	RAW       QuoteHashAlgorithm = "raw"
+)
+
+// Represents the response from a key derivation request.
+type DeriveKeyResponse struct {
+	Key              string   `json:"key"`
+	CertificateChain []string `json:"certificate_chain"`
+}
+
+// Decodes the key to bytes, optionally truncating to maxLength. If maxLength
+// < 0, the key is not truncated.
+func (d *DeriveKeyResponse) ToBytes(maxLength int) ([]byte, error) {
+	content := d.Key
+
+	content = strings.Replace(content, "-----BEGIN PRIVATE KEY-----", "", 1)
+	content = strings.Replace(content, "-----END PRIVATE KEY-----", "", 1)
+	content = strings.Replace(content, "\n", "", -1)
+
+	binary, err := base64.StdEncoding.DecodeString(content)
+	if err != nil {
+		return nil, err
+	}
+
+	if maxLength >= 0 && len(binary) > maxLength {
+		return binary[:maxLength], nil
+	}
+	return binary, nil
+}
+
+// Represents the response from a TDX quote request.
+type TdxQuoteResponse struct {
+	Quote    string `json:"quote"`
+	EventLog string `json:"event_log"`
+}
+
+const INIT_MR = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+
+// Replays the RTMR history to calculate final RTMR values
+func replayRTMR(history []string) (string, error) {
+	if len(history) == 0 {
+		return INIT_MR, nil
+	}
+
+	mr := make([]byte, 48)
+
+	for _, content := range history {
+		contentBytes, err := hex.DecodeString(content)
+		if err != nil {
+			return "", err
+		}
+
+		if len(contentBytes) < 48 {
+			padding := make([]byte, 48-len(contentBytes))
+			contentBytes = append(contentBytes, padding...)
+		}
+
+		h := sha512.New384()
+		h.Write(append(mr, contentBytes...))
+		mr = h.Sum(nil)
+	}
+
+	return hex.EncodeToString(mr), nil
+}
+
+// Replays the RTMR history to calculate final RTMR values
+func (r *TdxQuoteResponse) ReplayRTMRs() (map[int]string, error) {
+	var eventLog []struct {
+		IMR    int    `json:"imr"`
+		Digest string `json:"digest"`
+	}
+	json.Unmarshal([]byte(r.EventLog), &eventLog)
+
+	rtmrs := make(map[int]string, 4)
+	for idx := 0; idx < 4; idx++ {
+		history := make([]string, 0)
+		for _, event := range eventLog {
+			if event.IMR == idx {
+				history = append(history, event.Digest)
+			}
+		}
+
+		rtmr, err := replayRTMR(history)
+		if err != nil {
+			return nil, err
+		}
+
+		rtmrs[idx] = rtmr
+	}
+
+	return rtmrs, nil
+}
+
+// Handles communication with the Tappd service.
+type TappdClient struct {
+	endpoint   string
+	baseURL    string
+	httpClient *http.Client
+	logger     *slog.Logger
+}
+
+// Functional option for configuring a TappdClient.
+type TappdClientOption func(*TappdClient)
+
+// Sets the endpoint for the TappdClient.
+func WithEndpoint(endpoint string) TappdClientOption {
+	return func(c *TappdClient) {
+		c.endpoint = endpoint
+	}
+}
+
+// Sets the logger for the TappdClient
+func WithLogger(logger *slog.Logger) TappdClientOption {
+	return func(c *TappdClient) {
+		c.logger = logger
+	}
+}
+
+// Creates a new TappdClient instance based on the provided endpoint.
+// If the endpoint is empty, it will use the simulator endpoint if it is
+// set in the environment through DSTACK_SIMULATOR_ENDPOINT. Otherwise, it
+// will use the default endpoint at /var/run/tappd.sock.
+func NewTappdClient(opts ...TappdClientOption) *TappdClient {
+	client := &TappdClient{
+		endpoint:   "",
+		baseURL:    "",
+		httpClient: &http.Client{},
+		logger:     slog.Default(),
+	}
+
+	for _, opt := range opts {
+		opt(client)
+	}
+
+	client.endpoint = client.getEndpoint()
+
+	if strings.HasPrefix(client.endpoint, "http://") || strings.HasPrefix(client.endpoint, "https://") {
+		client.baseURL = client.endpoint
+	} else {
+		client.baseURL = "http://localhost"
+		client.httpClient = &http.Client{
+			Transport: &http.Transport{
+				DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
+					return net.Dial("unix", client.endpoint)
+				},
+			},
+		}
+	}
+
+	return client
+}
+
+// Returns the appropriate endpoint based on environment and input. If the
+// endpoint is empty, it will use the simulator endpoint if it is set in the
+// environment through DSTACK_SIMULATOR_ENDPOINT. Otherwise, it will use the
+// default endpoint at /var/run/tappd.sock.
+func (c *TappdClient) getEndpoint() string {
+	if c.endpoint != "" {
+		return c.endpoint
+	}
+	if simEndpoint, exists := os.LookupEnv("DSTACK_SIMULATOR_ENDPOINT"); exists {
+		c.logger.Info("using simulator endpoint", "endpoint", simEndpoint)
+		return simEndpoint
+	}
+	return "/var/run/tappd.sock"
+}
+
+// Sends an RPC request to the Tappd service.
+func (c *TappdClient) sendRPCRequest(ctx context.Context, path string, payload interface{}) ([]byte, error) {
+	jsonData, err := json.Marshal(payload)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "POST", c.baseURL+path, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	return io.ReadAll(resp.Body)
+}
+
+// Derives a key from the Tappd service. If altNames is empty or nil, it will
+// not be included in the request.
+func (c *TappdClient) DeriveKey(ctx context.Context, path string, subject string, altNames []string) (*DeriveKeyResponse, error) {
+	payload := map[string]interface{}{
+		"path":    path,
+		"subject": subject,
+	}
+	if len(altNames) > 0 {
+		payload["alt_names"] = altNames
+	}
+
+	data, err := c.sendRPCRequest(ctx, "/prpc/Tappd.DeriveKey", payload)
+	if err != nil {
+		return nil, err
+	}
+
+	var response DeriveKeyResponse
+	if err := json.Unmarshal(data, &response); err != nil {
+		return nil, err
+	}
+	return &response, nil
+}
+
+// Sends a TDX quote request to the Tappd service using SHA512 as the report
+// data hash algorithm.
+func (c *TappdClient) TdxQuote(ctx context.Context, reportData []byte) (*TdxQuoteResponse, error) {
+	return c.TdxQuoteWithHashAlgorithm(ctx, reportData, SHA512)
+}
+
+// Sends a TDX quote request to the Tappd service with a specific hash
+// report data hash algorithm.
+func (c *TappdClient) TdxQuoteWithHashAlgorithm(ctx context.Context, reportData []byte, hashAlgorithm QuoteHashAlgorithm) (*TdxQuoteResponse, error) {
+	hexData := hex.EncodeToString(reportData)
+	if hashAlgorithm == RAW {
+		if len(hexData) > 128 {
+			return nil, fmt.Errorf("report data is too large, it should be at most 64 bytes when hashAlgorithm is RAW")
+		}
+		if len(hexData) < 128 {
+			hexData = strings.Repeat("0", 128-len(hexData)) + hexData
+		}
+	}
+
+	payload := map[string]interface{}{
+		"report_data":    hexData,
+		"hash_algorithm": string(hashAlgorithm),
+	}
+
+	data, err := c.sendRPCRequest(ctx, "/prpc/Tappd.TdxQuote", payload)
+	if err != nil {
+		return nil, err
+	}
+
+	var response TdxQuoteResponse
+	if err := json.Unmarshal(data, &response); err != nil {
+		return nil, err
+	}
+	return &response, nil
+}