duoapi.go

package duoapi

import (
	"crypto/hmac"
	"crypto/sha1"
	"crypto/tls"
	"crypto/x509"
	"encoding/base64"
	"encoding/hex"
	"hash"
	"io"
	"io/ioutil"
	"math/rand"
	"net/http"
	"net/url"
	"sort"
	"strings"
	"time"
)

const (
	version           = "0.1.0"
	defaultUserAgent  = "duo_api_golang/" + version
	initialBackoffMS  = 1000
	maxBackoffMS      = 32000
	backoffFactor     = 2
	rateLimitHttpCode = 429
)

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,
	shaFunc shaNewFunc) string {
	canon := canonicalize(method, host, uri, params, date)
	mac := hmac.New(shaFunc, []byte(skey))
	mac.Write([]byte(canon))
	sig := hex.EncodeToString(mac.Sum(nil))
	auth := ikey + ":" + sig
	return "Basic " + base64.StdEncoding.EncodeToString([]byte(auth))
}

type shaNewFunc func() hash.Hash

type DuoApi struct {
	ikey       string
	skey       string
	host       string
	userAgent  string
	apiClient  httpClient
	authClient httpClient
	sleepSvc   sleepService
	shaFunc    shaNewFunc
}

type httpClient interface {
	Do(req *http.Request) (*http.Response, error)
}
type sleepService interface {
	Sleep(duration time.Duration)
}
type timeSleepService struct{}

func (svc timeSleepService) Sleep(duration time.Duration) {
	time.Sleep(duration + (time.Duration(rand.Intn(1000)) * time.Millisecond))
}

type apiOptions struct {
	timeout    time.Duration
	insecure   bool
	proxy      func(*http.Request) (*url.URL, error)
	transport  func(*http.Transport)
	shaNewFunc func() hash.Hash
}

func SetSHAType(shaFunc shaNewFunc) func(*apiOptions) {
	return func(opts *apiOptions) {
		opts.shaNewFunc = shaFunc
	}
}

// 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
	}
}

// SetTransport enables additional control over the HTTP transport used to connect to the Duo API.
func SetTransport(transport func(*http.Transport)) func(*apiOptions) {
	return func(opts *apiOptions) {
		opts.transport = transport
	}
}

// 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.  Information about the client will be
//           appended to the userAgent.
// 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,
		},
	}
	if opts.transport != nil {
		opts.transport(tr)
	}

	if userAgent != "" {
		userAgent += " "
	}
	userAgent += defaultUserAgent

	var shaFunc shaNewFunc
	if opts.shaNewFunc != nil {
		shaFunc = opts.shaNewFunc
	} else {
		shaFunc = sha1.New
	}

	return &DuoApi{
		ikey:      ikey,
		skey:      skey,
		host:      host,
		userAgent: userAgent,
		apiClient: &http.Client{
			Timeout:   opts.timeout,
			Transport: tr,
		},
		authClient: &http.Client{
			Transport: tr,
		},
		sleepSvc: timeSleepService{},
		shaFunc:  shaFunc,
	}
}

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) {

	url := url.URL{
		Scheme:   "https",
		Host:     duoapi.host,
		Path:     uri,
		RawQuery: params.Encode(),
	}
	headers := make(map[string]string)
	headers["User-Agent"] = duoapi.userAgent

	return duoapi.makeRetryableHttpCall(method, url, headers, nil, options...)
}

// 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) {

	now := time.Now().UTC().Format(time.RFC1123Z)
	auth_sig := sign(duoapi.ikey, duoapi.skey, method, duoapi.host, uri, now, params, duoapi.shaFunc)

	url := url.URL{
		Scheme: "https",
		Host:   duoapi.host,
		Path:   uri,
	}
	method = strings.ToUpper(method)

	if method == "GET" {
		url.RawQuery = params.Encode()
	}

	headers := make(map[string]string)
	headers["User-Agent"] = duoapi.userAgent
	headers["Authorization"] = auth_sig
	headers["Date"] = now
	var requestBody io.ReadCloser = nil
	if method == "POST" || method == "PUT" {
		headers["Content-Type"] = "application/x-www-form-urlencoded"
		requestBody = ioutil.NopCloser(strings.NewReader(params.Encode()))
	}

	return duoapi.makeRetryableHttpCall(method, url, headers, requestBody, options...)
}

func (duoapi *DuoApi) makeRetryableHttpCall(
	method string,
	url url.URL,
	headers map[string]string,
	body io.ReadCloser,
	options ...DuoApiOption) (*http.Response, []byte, error) {

	opts := duoapi.buildOptions(options...)

	client := duoapi.authClient
	if opts.timeout {
		client = duoapi.apiClient
	}

	backoffMs := initialBackoffMS
	for {
		request, err := http.NewRequest(method, url.String(), nil)
		if err != nil {
			return nil, nil, err
		}

		if headers != nil {
			for k, v := range headers {
				request.Header.Set(k, v)
			}
		}
		if body != nil {
			request.Body = body
		}

		resp, err := client.Do(request)
		var body []byte
		if err != nil {
			return resp, body, err
		}

		if backoffMs > maxBackoffMS || resp.StatusCode != rateLimitHttpCode {
			body, err = ioutil.ReadAll(resp.Body)
			resp.Body.Close()
			return resp, body, err
		}

		duoapi.sleepSvc.Sleep(time.Millisecond * time.Duration(backoffMs))
		backoffMs *= backoffFactor
	}
}

const duoPinnedCert string = `
subject= /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA
-----BEGIN CERTIFICATE-----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NW1fiQG2SVufAQWbqz0lwcy2f8Lxb4bG+mRo64EtlOtCt/qMHt1i8b5QZ7dsvfPx
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+o0bJW1sj6W3YQGx0qMmoRBxna3iw/nDmVG3KwcIzi7mULKn+gpFL6Lw8g==
-----END CERTIFICATE-----

subject= /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Global Root CA
-----BEGIN CERTIFICATE-----
MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh
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-----END CERTIFICATE-----

subject= /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA
-----BEGIN CERTIFICATE-----
MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs
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-----END CERTIFICATE-----

subject= /C=US/O=SecureTrust Corporation/CN=SecureTrust CA
-----BEGIN CERTIFICATE-----
MIIDuDCCAqCgAwIBAgIQDPCOXAgWpa1Cf/DrJxhZ0DANBgkqhkiG9w0BAQUFADBI
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-----END CERTIFICATE-----

subject= /C=US/O=SecureTrust Corporation/CN=Secure Global CA
-----BEGIN CERTIFICATE-----
MIIDvDCCAqSgAwIBAgIQB1YipOjUiolN9BPI8PjqpTANBgkqhkiG9w0BAQUFADBK
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-----END CERTIFICATE-----`