forked from Versent/saml2aws
-
Notifications
You must be signed in to change notification settings - Fork 0
/
keycloak.go
237 lines (186 loc) · 5.53 KB
/
keycloak.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
package keycloak
import (
"bytes"
"io/ioutil"
"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"
"fmt"
)
var logger = logrus.WithField("provider", "keycloak")
// Client wrapper around KeyCloak.
type Client struct {
client *provider.HTTPClient
}
// New create a new KeyCloakClient
func New(idpAccount *cfg.IDPAccount) (*Client, error) {
tr := provider.NewDefaultTransport(idpAccount.SkipVerify)
client, err := provider.NewHTTPClient(tr)
if err != nil {
return nil, errors.Wrap(err, "error building http client")
}
return &Client{
client: client,
}, nil
}
// Authenticate logs into KeyCloak and returns a SAML response
func (kc *Client) Authenticate(loginDetails *creds.LoginDetails) (string, error) {
authSubmitURL, authForm, err := kc.getLoginForm(loginDetails)
if err != nil {
return "", errors.Wrap(err, "error retrieving login form from idp")
}
data, err := kc.postLoginForm(authSubmitURL, authForm)
if err != nil {
return "", fmt.Errorf("error submitting login form")
}
if authSubmitURL == "" {
return "", fmt.Errorf("error submitting login form")
}
doc, err := goquery.NewDocumentFromReader(bytes.NewBuffer(data))
if err != nil {
return "", errors.Wrap(err, "error parsing document")
}
if containsTotpForm(doc) {
totpSubmitURL, err := extractSubmitURL(doc)
if err != nil {
return "", errors.Wrap(err, "unable to locate IDP totp form submit URL")
}
doc, err = kc.postTotpForm(totpSubmitURL, loginDetails.MFAToken, doc)
if err != nil {
return "", errors.Wrap(err, "error posting totp form")
}
}
var samlAssertion string
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
}
func (kc *Client) getLoginForm(loginDetails *creds.LoginDetails) (string, url.Values, error) {
res, err := kc.client.Get(loginDetails.URL)
if err != nil {
return "", nil, errors.Wrap(err, "error retrieving form")
}
doc, err := goquery.NewDocumentFromResponse(res)
if err != nil {
return "", nil, errors.Wrap(err, "failed to build document from response")
}
authForm := url.Values{}
doc.Find("input").Each(func(i int, s *goquery.Selection) {
updateKeyCloakFormData(authForm, s, loginDetails)
})
authSubmitURL, err := extractSubmitURL(doc)
if err != nil {
return "", nil, errors.Wrap(err, "unable to locate IDP authentication form submit URL")
}
return authSubmitURL, authForm, nil
}
func (kc *Client) postLoginForm(authSubmitURL string, authForm url.Values) ([]byte, error) {
req, err := http.NewRequest("POST", authSubmitURL, strings.NewReader(authForm.Encode()))
if err != nil {
return nil, errors.Wrap(err, "error building authentication request")
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
res, err := kc.client.Do(req)
if err != nil {
return nil, errors.Wrap(err, "error retrieving login form")
}
data, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, errors.Wrap(err, "error retrieving body")
}
return data, nil
}
func (kc *Client) postTotpForm(totpSubmitURL string, mfaToken string, doc *goquery.Document) (*goquery.Document, error) {
otpForm := url.Values{}
if mfaToken == "" {
mfaToken = prompter.RequestSecurityCode("000000")
}
doc.Find("input").Each(func(i int, s *goquery.Selection) {
updateOTPFormData(otpForm, s, mfaToken)
})
req, err := http.NewRequest("POST", totpSubmitURL, 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 := kc.client.Do(req)
if err != nil {
return nil, errors.Wrap(err, "error retrieving content")
}
doc, err = goquery.NewDocumentFromResponse(res)
if err != nil {
return nil, errors.Wrap(err, "error reading totp form response")
}
return doc, nil
}
func extractSubmitURL(doc *goquery.Document) (string, error) {
var submitURL string
doc.Find("form").Each(func(i int, s *goquery.Selection) {
action, ok := s.Attr("action")
if !ok {
return
}
submitURL = action
})
if submitURL == "" {
return "", fmt.Errorf("unable to locate form submit URL")
}
return submitURL, nil
}
func containsTotpForm(doc *goquery.Document) bool {
totpIndex := doc.Find("input#totp").Index()
if totpIndex != -1 {
return true
}
return false
}
func updateKeyCloakFormData(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
}
lname := strings.ToLower(name)
if strings.Contains(lname, "username") {
authForm.Add(name, user.Username)
} else if strings.Contains(lname, "password") {
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, "totp") {
otpForm.Add(name, token)
}
}