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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
VYcgoc/lbQrISXwxmDNsIumH0DJaoroTghHtORedmTpyoeb6pNnVFzF1roV9Iq4/
AUaG9ih5yLHa5FcXxH4cDrC0kqZWs72yl+2qp/C3xag/lRbQ/6GW6whfGHdPAgMB
AAGjYzBhMA4GA1UdDwEB/wQEAwIBhjAPBgNVHRMBAf8EBTADAQH/MB0GA1UdDgQW
BBRF66Kv9JLLgjEtUYunpyGd823IDzAfBgNVHSMEGDAWgBRF66Kv9JLLgjEtUYun
pyGd823IDzANBgkqhkiG9w0BAQUFAAOCAQEAog683+Lt8ONyc3pklL/3cmbYMuRC
dWKuh+vy1dneVrOfzM4UKLkNl2BcEkxY5NM9g0lFWJc1aRqoR+pWxnmrEthngYTf
fwk8lOa4JiwgvT2zKIn3X/8i4peEH+ll74fg38FnSbNd67IJKusm7Xi+fT8r87cm
NW1fiQG2SVufAQWbqz0lwcy2f8Lxb4bG+mRo64EtlOtCt/qMHt1i8b5QZ7dsvfPx
H2sMNgcWfzd8qVttevESRmCD1ycEvkvOl77DZypoEd+A5wwzZr8TDRRu838fYxAe
+o0bJW1sj6W3YQGx0qMmoRBxna3iw/nDmVG3KwcIzi7mULKn+gpFL6Lw8g==
-----END CERTIFICATE-----
subject= /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Global Root CA
-----BEGIN CERTIFICATE-----
MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD
QTAeFw0wNjExMTAwMDAwMDBaFw0zMTExMTAwMDAwMDBaMGExCzAJBgNVBAYTAlVT
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b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IENBMIIBIjANBgkqhkiG
9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB
CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97
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gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO
BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR
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DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr
hMAtudXH/vTBH1jLuG2cenTnmCmrEbXjcKChzUyImZOMkXDiqw8cvpOp/2PV5Adg
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CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=
-----END CERTIFICATE-----
subject= /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA
-----BEGIN CERTIFICATE-----
MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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-----END CERTIFICATE-----
subject= /C=US/O=SecureTrust Corporation/CN=SecureTrust CA
-----BEGIN CERTIFICATE-----
MIIDuDCCAqCgAwIBAgIQDPCOXAgWpa1Cf/DrJxhZ0DANBgkqhkiG9w0BAQUFADBI
MQswCQYDVQQGEwJVUzEgMB4GA1UEChMXU2VjdXJlVHJ1c3QgQ29ycG9yYXRpb24x
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3ItHuuG51WLQoqD0ZwV4KWMabwTW+MZMo5qxN7SN5ShLHZ4swrhovO0C7jE=
-----END CERTIFICATE-----
subject= /C=US/O=SecureTrust Corporation/CN=Secure Global CA
-----BEGIN CERTIFICATE-----
MIIDvDCCAqSgAwIBAgIQB1YipOjUiolN9BPI8PjqpTANBgkqhkiG9w0BAQUFADBK
MQswCQYDVQQGEwJVUzEgMB4GA1UEChMXU2VjdXJlVHJ1c3QgQ29ycG9yYXRpb24x
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-----END CERTIFICATE-----`