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adfs.go
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adfs.go
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package adfs
import (
"crypto/tls"
"fmt"
"log"
"net/http"
"net/url"
"strings"
"github.com/PuerkitoBio/goquery"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/versent/saml2aws/pkg/cfg"
"github.com/versent/saml2aws/pkg/creds"
"github.com/versent/saml2aws/pkg/prompter"
"github.com/versent/saml2aws/pkg/provider"
)
var logger = logrus.WithField("provider", "adfs")
// Client wrapper around ADFS enabling authentication and retrieval of assertions
type Client struct {
client *provider.HTTPClient
idpAccount *cfg.IDPAccount
}
// New create a new ADFS client
func New(idpAccount *cfg.IDPAccount) (*Client, error) {
tr := &http.Transport{
Proxy: http.ProxyFromEnvironment,
TLSClientConfig: &tls.Config{InsecureSkipVerify: idpAccount.SkipVerify, Renegotiation: tls.RenegotiateFreelyAsClient},
}
client, err := provider.NewHTTPClient(tr)
if err != nil {
return nil, errors.Wrap(err, "error building http client")
}
return &Client{
client: client,
idpAccount: idpAccount,
}, nil
}
// Authenticate to ADFS and return the data from the body of the SAML assertion.
func (ac *Client) Authenticate(loginDetails *creds.LoginDetails) (string, error) {
var authSubmitURL string
var samlAssertion string
awsURN := url.QueryEscape(ac.idpAccount.AmazonWebservicesURN)
adfsURL := fmt.Sprintf("%s/adfs/ls/IdpInitiatedSignOn.aspx?loginToRp=%s", loginDetails.URL, awsURN)
res, err := ac.client.Get(adfsURL)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving form")
}
doc, err := goquery.NewDocumentFromResponse(res)
if err != nil {
return samlAssertion, errors.Wrap(err, "failed to build document from response")
}
authForm := url.Values{}
doc.Find("input").Each(func(i int, s *goquery.Selection) {
updateFormData(authForm, s, loginDetails)
})
doc.Find("form").Each(func(i int, s *goquery.Selection) {
action, ok := s.Attr("action")
if !ok {
return
}
authSubmitURL = action
})
if authSubmitURL == "" {
return samlAssertion, fmt.Errorf("unable to locate IDP authentication form submit URL")
}
//log.Printf("id authentication url: %s", authSubmitURL)
req, err := http.NewRequest("POST", authSubmitURL, strings.NewReader(authForm.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 = ac.client.Do(req)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving login form results")
}
switch ac.idpAccount.MFA {
case "VIP":
res, err = ac.vipMFA(authSubmitURL, loginDetails.MFAToken, res)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving mfa form results")
}
}
// just parse the response whether res is from the login form or MFA form
doc, err = goquery.NewDocumentFromResponse(res)
if err != nil {
return samlAssertion, errors.Wrap(err, "error retrieving login response body")
}
doc.Find("input").Each(func(i int, s *goquery.Selection) {
name, ok := s.Attr("name")
if !ok {
log.Fatalf("unable to locate IDP authentication form submit URL")
}
if name == "SAMLResponse" {
val, ok := s.Attr("value")
if !ok {
log.Fatalf("unable to locate saml assertion value")
}
samlAssertion = val
}
})
return samlAssertion, nil
}
// vipMFA when supplied with the the form response document attempt to extract the VIP mfa related field
// then use that to trigger a submit of the MFA security token
func (ac *Client) vipMFA(authSubmitURL string, mfaToken string, res *http.Response) (*http.Response, error) {
doc, err := goquery.NewDocumentFromResponse(res)
if err != nil {
return nil, errors.Wrap(err, "error retrieving saml response body")
}
otpForm := url.Values{}
vipIndex := doc.Find("input#authMethod[value=VIPAuthenticationProviderWindowsAccountName]").Index()
if vipIndex == -1 {
return res, nil // if we didn't find the MFA flag then just continue
}
if mfaToken == "" {
mfaToken = prompter.RequestSecurityCode("000000")
}
doc.Find("input").Each(func(i int, s *goquery.Selection) {
updateOTPFormData(otpForm, s, mfaToken)
})
doc.Find("form").Each(func(i int, s *goquery.Selection) {
action, ok := s.Attr("action")
if !ok {
return
}
authSubmitURL = action
})
if authSubmitURL == "" {
return nil, fmt.Errorf("unable to locate IDP MFA form submit URL")
}
req, err := http.NewRequest("POST", authSubmitURL, strings.NewReader(otpForm.Encode()))
if err != nil {
return nil, errors.Wrap(err, "error building MFA request")
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
res, err = ac.client.Do(req)
if err != nil {
return nil, errors.Wrap(err, "error retrieving content")
}
return res, nil
}
func updateFormData(authForm url.Values, s *goquery.Selection, user *creds.LoginDetails) {
name, ok := s.Attr("name")
// log.Printf("name = %s ok = %v", name, ok)
if !ok {
return
}
typeValue, typeFound := s.Attr("type")
hiddenAttr := typeFound && typeValue == "hidden"
lname := strings.ToLower(name)
if strings.Contains(lname, "user") {
if !hiddenAttr {
authForm.Add(name, user.Username)
}
} else if strings.Contains(lname, "email") {
if !hiddenAttr {
authForm.Add(name, user.Username)
}
} else if strings.Contains(lname, "pass") {
if !hiddenAttr {
authForm.Add(name, user.Password)
}
} else {
// pass through any hidden fields
val, ok := s.Attr("value")
if !ok {
return
}
authForm.Add(name, val)
}
}
func updateOTPFormData(otpForm url.Values, s *goquery.Selection, token string) {
name, ok := s.Attr("name")
// log.Printf("name = %s ok = %v", name, ok)
if !ok {
return
}
lname := strings.ToLower(name)
if strings.Contains(lname, "security_code") {
otpForm.Add(name, token)
} else {
// pass through any hidden fields
val, ok := s.Attr("value")
if !ok {
return
}
otpForm.Add(name, val)
}
}