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okta.go
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okta.go
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package saml2aws
import (
"bytes"
"crypto/tls"
"fmt"
"html"
"io/ioutil"
"net/http"
"net/http/cookiejar"
"net/url"
"strings"
"time"
"github.com/PuerkitoBio/goquery"
"github.com/pkg/errors"
prompt "github.com/segmentio/go-prompt"
"github.com/tidwall/gjson"
"encoding/json"
"golang.org/x/net/publicsuffix"
)
// OktaClient is a wrapper representing a Okta SAML client
type OktaClient struct {
client *http.Client
}
// AuthRequest represents an mfa okta request
type AuthRequest struct {
Username string `json:"username"`
Password string `json:"password"`
}
// VerifyRequest represents an mfa verify request
type VerifyRequest struct {
StateToken string `json:"stateToken"`
}
// NewOktaClient creates a new Okta client
func NewOktaClient(skipVerify bool) (*OktaClient, error) {
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: skipVerify},
}
options := &cookiejar.Options{
PublicSuffixList: publicsuffix.List,
}
jar, err := cookiejar.New(options)
if err != nil {
return nil, err
}
client := &http.Client{Transport: tr, Jar: jar}
return &OktaClient{
client: client,
}, nil
}
// Authenticate logs into Okta and returns a SAML response
func (oc *OktaClient) Authenticate(loginDetails *LoginDetails) (string, error) {
var samlAssertion string
oktaEntryURL := fmt.Sprintf("https://%s", loginDetails.Hostname)
oktaURL, err := url.Parse(oktaEntryURL)
oktaOrgHost := oktaURL.Host
//authenticate via okta api
authReq := AuthRequest{Username: loginDetails.Username, Password: loginDetails.Password}
authBody := new(bytes.Buffer)
json.NewEncoder(authBody).Encode(authReq)
authSubmitURL := fmt.Sprintf("https://%s/api/v1/authn", oktaOrgHost)
req, err := http.NewRequest("POST", authSubmitURL, authBody)
if err != nil {
return samlAssertion, errors.Wrap(err, "error building authentication request")
}
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Accept", "application/json")
res, err := oc.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving auth response")
}
body, err := ioutil.ReadAll(res.Body)
resp := string(body)
stateToken := gjson.Get(resp, "stateToken").String()
authStatus := gjson.Get(resp, "status").String()
// mfa required
if authStatus == "MFA_REQUIRED" {
deviceID := gjson.Get(resp, "_embedded.factors.0.id").String()
oktaVerify := gjson.Get(resp, "_embedded.factors.0._links.verify.href").String()
mfaProvider := gjson.Get(resp, "_embedded.factors.0.provider").String()
if mfaProvider != "DUO" {
return samlAssertion, errors.Wrap(err, "unsupported mfa provider")
}
// get duo host, signature & callback
verifyReq := VerifyRequest{StateToken: stateToken}
verifyBody := new(bytes.Buffer)
json.NewEncoder(verifyBody).Encode(verifyReq)
req, err := http.NewRequest("POST", oktaVerify, verifyBody)
if err != nil {
return samlAssertion, errors.Wrap(err, "error building verify request")
}
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Accept", "application/json")
res, err := oc.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving verify response")
}
body, err = ioutil.ReadAll(res.Body)
resp = string(body)
duoHost := gjson.Get(resp, "_embedded.factor._embedded.verification.host").String()
duoSignature := gjson.Get(resp, "_embedded.factor._embedded.verification.signature").String()
duoSiguatres := strings.Split(duoSignature, ":")
//duoSignatures[0] = TX
//duoSignatures[1] = APP
duoCallback := gjson.Get(resp, "_embedded.factor._embedded.verification._links.complete.href").String()
// initiate duo mfa to get sid
duoSubmitURL := fmt.Sprintf("https://%s/frame/web/v1/auth", duoHost)
duoForm := url.Values{}
duoForm.Add("parent", fmt.Sprintf("https://%s/signin/verify/duo/web", oktaOrgHost))
duoForm.Add("java_version", "")
duoForm.Add("java_version", "")
duoForm.Add("flash_version", "")
duoForm.Add("screen_resolution_width", "3008")
duoForm.Add("screen_resolution_height", "1692")
duoForm.Add("color_depth", "24")
req, err = http.NewRequest("POST", duoSubmitURL, strings.NewReader(duoForm.Encode()))
if err != nil {
return samlAssertion, errors.Wrap(err, "error building authentication request")
}
q := req.URL.Query()
q.Add("tx", duoSiguatres[0])
req.URL.RawQuery = q.Encode()
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
res, err = oc.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving verify response")
}
//try to extract sid
doc, err := goquery.NewDocumentFromResponse(res)
if err != nil {
return samlAssertion, errors.Wrap(err, "error parsing document")
}
duoSID, ok := doc.Find("input[name=\"sid\"]").Attr("value")
if !ok {
return samlAssertion, errors.Wrap(err, "unable to locate saml response")
}
duoSID = html.UnescapeString(duoSID)
//prompt for mfa type
//only supporting push or passcode for now
var token string
var mfaOptions = []string{
"Passcode",
"Duo Push",
}
mfaOption := prompt.Choose("Select a DUO MFA Option", mfaOptions)
if mfaOptions[mfaOption] == "Passcode" {
//get users DUO MFA Token
token = prompt.StringRequired("Enter passcode")
}
// send mfa auth request
duoSubmitURL = fmt.Sprintf("https://%s/frame/prompt", duoHost)
duoForm = url.Values{}
duoForm.Add("sid", duoSID)
duoForm.Add("device", "phone1")
duoForm.Add("factor", mfaOptions[mfaOption])
duoForm.Add("out_of_date", "false")
if mfaOptions[mfaOption] == "Passcode" {
duoForm.Add("passcode", token)
}
req, err = http.NewRequest("POST", duoSubmitURL, strings.NewReader(duoForm.Encode()))
if err != nil {
return samlAssertion, errors.Wrap(err, "error building authentication request")
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
res, err = oc.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving verify response")
}
body, err = ioutil.ReadAll(res.Body)
resp = string(body)
duoTxStat := gjson.Get(resp, "stat").String()
duoTxID := gjson.Get(resp, "response.txid").String()
if duoTxStat != "OK" {
return samlAssertion, errors.Wrap(err, "error authenticating mfa device")
}
// get duo cookie
duoSubmitURL = fmt.Sprintf("https://%s/frame/status", duoHost)
duoForm = url.Values{}
duoForm.Add("sid", duoSID)
duoForm.Add("txid", duoTxID)
req, err = http.NewRequest("POST", duoSubmitURL, strings.NewReader(duoForm.Encode()))
if err != nil {
return samlAssertion, errors.Wrap(err, "error building authentication request")
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
res, err = oc.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving verify response")
}
body, err = ioutil.ReadAll(res.Body)
resp = string(body)
duoTxResult := gjson.Get(resp, "response.result").String()
duoTxCookie := gjson.Get(resp, "response.cookie").String()
fmt.Println(gjson.Get(resp, "response.status").String())
if duoTxResult != "SUCCESS" {
//poll as this is likely a push request
for {
time.Sleep(3 * time.Second)
req, err = http.NewRequest("POST", duoSubmitURL, strings.NewReader(duoForm.Encode()))
if err != nil {
return samlAssertion, errors.Wrap(err, "error building authentication request")
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
res, err = oc.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving verify response")
}
body, err = ioutil.ReadAll(res.Body)
resp := string(body)
duoTxResult = gjson.Get(resp, "response.result").String()
duoTxCookie = gjson.Get(resp, "response.cookie").String()
fmt.Println(gjson.Get(resp, "response.status").String())
if duoTxResult == "FAILURE" {
return samlAssertion, errors.Wrap(err, "failed to authenticate device")
}
if duoTxResult == "SUCCESS" {
break
}
}
}
// callback to okta with cookie
oktaForm := url.Values{}
oktaForm.Add("id", deviceID)
oktaForm.Add("stateToken", stateToken)
oktaForm.Add("sig_response", fmt.Sprintf("%s:%s", duoTxCookie, duoSiguatres[1]))
req, err = http.NewRequest("POST", duoCallback, strings.NewReader(oktaForm.Encode()))
if err != nil {
return samlAssertion, errors.Wrap(err, "error building authentication request")
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
res, err = oc.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving verify response")
}
// extract okta session token
verifyReq = VerifyRequest{StateToken: stateToken}
verifyBody = new(bytes.Buffer)
json.NewEncoder(verifyBody).Encode(verifyReq)
req, err = http.NewRequest("POST", oktaVerify, verifyBody)
if err != nil {
return samlAssertion, errors.Wrap(err, "error building verify request")
}
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Accept", "application/json")
req.Header.Add("X-Okta-XsrfToken", "")
res, err = oc.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving verify response")
}
body, err = ioutil.ReadAll(res.Body)
resp = string(body)
}
oktaSessionToken := gjson.Get(resp, "sessionToken").String()
//now call saml endpoint
oktaSessionRedirectURL := fmt.Sprintf("https://%s/login/sessionCookieRedirect", oktaOrgHost)
req, err = http.NewRequest("GET", oktaSessionRedirectURL, nil)
if err != nil {
return samlAssertion, errors.Wrap(err, "error building authentication request")
}
q := req.URL.Query()
q.Add("checkAccountSetupComplete", "true")
q.Add("token", oktaSessionToken)
q.Add("redirectUrl", oktaEntryURL)
req.URL.RawQuery = q.Encode()
res, err = oc.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving verify response")
}
//try to extract SAMLResponse
doc, err := goquery.NewDocumentFromResponse(res)
if err != nil {
return samlAssertion, errors.Wrap(err, "error parsing document")
}
samlAssertion, ok := doc.Find("input[name=\"SAMLResponse\"]").Attr("value")
if !ok {
return samlAssertion, errors.Wrap(err, "unable to locate saml response")
}
return samlAssertion, nil
}