package duoapi import ( "crypto/hmac" "crypto/sha1" "crypto/tls" "crypto/x509" "encoding/base64" "encoding/hex" "io/ioutil" "net/http" "net/url" "sort" "strings" "time" ) var spaceReplacer *strings.Replacer = strings.NewReplacer("+", "%20") func canonParams(params url.Values) string { // Values must be in sorted order for key, val := range params { sort.Strings(val) params[key] = val } // Encode will place Keys in sorted order ordered_params := params.Encode() // Encoder turns spaces into +, but we need %XX escaping return spaceReplacer.Replace(ordered_params) } func canonicalize(method string, host string, uri string, params url.Values, date string) string { var canon [5]string canon[0] = date canon[1] = strings.ToUpper(method) canon[2] = strings.ToLower(host) canon[3] = uri canon[4] = canonParams(params) return strings.Join(canon[:], "\n") } func sign(ikey string, skey string, method string, host string, uri string, date string, params url.Values) string { canon := canonicalize(method, host, uri, params, date) mac := hmac.New(sha1.New, []byte(skey)) mac.Write([]byte(canon)) sig := hex.EncodeToString(mac.Sum(nil)) auth := ikey + ":" + sig return "Basic " + base64.StdEncoding.EncodeToString([]byte(auth)) } type DuoApi struct { ikey string skey string host string userAgent string apiClient *http.Client authClient *http.Client } type apiOptions struct { timeout time.Duration insecure bool proxy func(*http.Request) (*url.URL, error) } // Optional parameter for NewDuoApi, used to configure timeouts on API calls. func SetTimeout(timeout time.Duration) func(*apiOptions) { return func(opts *apiOptions) { opts.timeout = timeout return } } // Optional parameter for testing only. Bypasses all TLS certificate validation. func SetInsecure() func(*apiOptions) { return func(opts *apiOptions) { opts.insecure = true } } // Optional parameter for NewDuoApi, used to configure an HTTP Connect proxy // server for all outbound communications. func SetProxy(proxy func(*http.Request) (*url.URL, error)) func(*apiOptions) { return func(opts *apiOptions) { opts.proxy = proxy } } // Build an return a DuoApi struct. // ikey is your Duo integration key // skey is your Duo integration secret key // host is your Duo host // userAgent allows you to specify the user agent string used when making // the web request to Duo. // options are optional parameters. Use SetTimeout() to specify a timeout value // for Rest API calls. Use SetProxy() to specify proxy settings for Duo API calls. // // Example: duoapi.NewDuoApi(ikey,skey,host,userAgent,duoapi.SetTimeout(10*time.Second)) func NewDuoApi(ikey string, skey string, host string, userAgent string, options ...func(*apiOptions)) *DuoApi { opts := apiOptions{proxy: http.ProxyFromEnvironment} for _, o := range options { o(&opts) } // Certificate pinning certPool := x509.NewCertPool() certPool.AppendCertsFromPEM([]byte(duoPinnedCert)) tr := &http.Transport{ Proxy: opts.proxy, TLSClientConfig: &tls.Config{ RootCAs: certPool, InsecureSkipVerify: opts.insecure, }, } return &DuoApi{ ikey: ikey, skey: skey, host: host, userAgent: userAgent, apiClient: &http.Client{ Timeout: opts.timeout, Transport: tr, }, authClient: &http.Client{ Transport: tr, }, } } type requestOptions struct { timeout bool } type DuoApiOption func(*requestOptions) // Pass to Request or SignedRequest to configure a timeout on the request func UseTimeout(opts *requestOptions) { opts.timeout = true } func (duoapi *DuoApi) buildOptions(options ...DuoApiOption) *requestOptions { opts := &requestOptions{} for _, o := range options { o(opts) } return opts } // API calls will return a StatResult object. On success, Stat is 'OK'. // On error, Stat is 'FAIL', and Code, Message, and Message_Detail // contain error information. type StatResult struct { Stat string Code *int32 Message *string Message_Detail *string } // Make an unsigned Duo Rest API call. See Duo's online documentation // for the available REST API's. // method is POST or GET // uri is the URI of the Duo Rest call // params HTTP query parameters to include in the call. // options Optional parameters. Use UseTimeout to toggle whether the // Duo Rest API call should timeout or not. // // Example: duo.Call("GET", "/auth/v2/ping", nil, duoapi.UseTimeout) func (duoapi *DuoApi) Call(method string, uri string, params url.Values, options ...DuoApiOption) (*http.Response, []byte, error) { opts := duoapi.buildOptions(options...) client := duoapi.authClient if opts.timeout { client = duoapi.apiClient } url := url.URL{ Scheme: "https", Host: duoapi.host, Path: uri, RawQuery: params.Encode(), } request, err := http.NewRequest(method, url.String(), nil) if err != nil { return nil, nil, err } resp, err := client.Do(request) var body []byte if err == nil { body, err = ioutil.ReadAll(resp.Body) resp.Body.Close() } return resp, body, err } // Make a signed Duo Rest API call. See Duo's online documentation // for the available REST API's. // method is POST or GET // uri is the URI of the Duo Rest call // params HTTP query parameters to include in the call. // options Optional parameters. Use UseTimeout to toggle whether the // Duo Rest API call should timeout or not. // // Example: duo.SignedCall("GET", "/auth/v2/check", nil, duoapi.UseTimeout) func (duoapi *DuoApi) SignedCall(method string, uri string, params url.Values, options ...DuoApiOption) (*http.Response, []byte, error) { opts := duoapi.buildOptions(options...) now := time.Now().UTC().Format(time.RFC1123Z) auth_sig := sign(duoapi.ikey, duoapi.skey, method, duoapi.host, uri, now, params) url := url.URL{ Scheme: "https", Host: duoapi.host, Path: uri, } method = strings.ToUpper(method) if method == "GET" { url.RawQuery = params.Encode() } request, err := http.NewRequest(method, url.String(), nil) if err != nil { return nil, nil, err } request.Header.Set("Authorization", auth_sig) request.Header.Set("Date", now) if method == "POST" || method == "PUT" { request.Body = ioutil.NopCloser(strings.NewReader(params.Encode())) request.Header.Set("Content-type", "application/x-www-form-urlencoded") } client := duoapi.authClient if opts.timeout { client = duoapi.apiClient } resp, err := client.Do(request) var body []byte if err == nil { body, err = ioutil.ReadAll(resp.Body) resp.Body.Close() } return resp, body, err } const duoPinnedCert string = ` subject= /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA -----BEGIN CERTIFICATE----- MIIDtzCCAp+gAwIBAgIQDOfg5RfYRv6P5WD8G/AwOTANBgkqhkiG9w0BAQUFADBl MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJv b3QgQ0EwHhcNMDYxMTEwMDAwMDAwWhcNMzExMTEwMDAwMDAwWjBlMQswCQYDVQQG EwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3d3cuZGlnaWNl cnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJvb3QgQ0EwggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCtDhXO5EOAXLGH87dg+XESpa7c JpSIqvTO9SA5KFhgDPiA2qkVlTJhPLWxKISKityfCgyDF3qPkKyK53lTXDGEKvYP mDI2dsze3Tyoou9q+yHyUmHfnyDXH+Kx2f4YZNISW1/5WBg1vEfNoTb5a3/UsDg+ wRvDjDPZ2C8Y/igPs6eD1sNuRMBhNZYW/lmci3Zt1/GiSw0r/wty2p5g0I6QNcZ4 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