forked from Nerzal/gocloak-echo
-
Notifications
You must be signed in to change notification settings - Fork 0
/
directgrantflow.go
207 lines (173 loc) · 5.29 KB
/
directgrantflow.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
package gocloakecho
import (
"context"
"net/http"
"strings"
"github.com/Nerzal/gocloak/v8"
"github.com/Nerzal/gocloak/v8/pkg/jwx"
"github.com/dgrijalva/jwt-go/v4"
"github.com/AndreasWolny/echo/v4"
)
// NewDirectGrantMiddleware instantiates a new AuthenticationMiddleWare when using the Keycloak Direct Grant aka
// Resource Owner Password Credentials Flow
//
// see https://www.keycloak.org/docs/latest/securing_apps/index.html#_resource_owner_password_credentials_flow and
// https://tools.ietf.org/html/rfc6749#section-4.3 for more information about this flow
//noinspection GoUnusedExportedFunction
func NewDirectGrantMiddleware(ctx context.Context, gocloak gocloak.GoCloak, realm, clientID, clientSecret, allowedScope string, customHeaderName *string) AuthenticationMiddleWare {
return &directGrantMiddleware{
gocloak: gocloak,
realm: realm,
allowedScope: allowedScope,
customHeaderName: customHeaderName,
clientID: clientID,
clientSecret: clientSecret,
ctx: ctx,
}
}
type directGrantMiddleware struct {
gocloak gocloak.GoCloak
realm string
clientID string
clientSecret string
allowedScope string
customHeaderName *string
ctx context.Context
}
// CheckTokenCustomHeader used to verify authorization tokens
func (auth *directGrantMiddleware) CheckTokenCustomHeader(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
token := ""
if auth.customHeaderName != nil {
token = c.Request().Header.Get(*auth.customHeaderName)
}
realm := auth.realm
if realm == "" {
value, ok := c.Get(KeyRealm).(string)
if ok {
realm = value
}
}
if token == "" {
token = c.Request().Header.Get("Authorization")
}
if token == "" {
return c.JSON(http.StatusUnauthorized, gocloak.APIError{
Code: 403,
Message: "Authorization header missing",
})
}
decodedToken, err := auth.stripBearerAndCheckToken(token, realm)
if err != nil {
return c.JSON(http.StatusUnauthorized, gocloak.APIError{
Code: 403,
Message: "Invalid or malformed token: " + err.Error(),
})
}
if !decodedToken.Valid {
return c.JSON(http.StatusForbidden, gocloak.APIError{
Code: http.StatusForbidden,
Message: "Invalid Token",
})
}
return next(c)
}
}
func (auth *directGrantMiddleware) stripBearerAndCheckToken(accessToken string, realm string) (*jwt.Token, error) {
accessToken = extractBearerToken(accessToken)
decodedToken, _, err := auth.gocloak.DecodeAccessToken(auth.ctx, accessToken, realm, "")
return decodedToken, err
}
func (auth *directGrantMiddleware) DecodeAndValidateToken(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
token := ""
if auth.customHeaderName != nil {
token = c.Request().Header.Get(*auth.customHeaderName)
}
if token == "" {
token = c.Request().Header.Get("Authorization")
}
if token == "" {
return c.JSON(http.StatusUnauthorized, gocloak.APIError{
Code: 403,
Message: "Authorization header missing",
})
}
return next(c)
}
}
// CheckToken used to verify authorization tokens
func (auth *directGrantMiddleware) CheckToken(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
token := ""
if auth.customHeaderName != nil {
token = c.Request().Header.Get(*auth.customHeaderName)
}
if token == "" {
token = c.Request().Header.Get("Authorization")
}
if token == "" {
return c.JSON(http.StatusUnauthorized, gocloak.APIError{
Code: 403,
Message: "Authorization header missing",
})
}
token = extractBearerToken(token)
if token == "" {
return c.JSON(http.StatusUnauthorized, gocloak.APIError{
Code: 403,
Message: "Bearer Token missing",
})
}
result, err := auth.gocloak.RetrospectToken(auth.ctx, token, auth.clientID, auth.clientSecret, auth.realm)
if err != nil {
return c.JSON(http.StatusUnauthorized, gocloak.APIError{
Code: 403,
Message: "Invalid or malformed token:" + err.Error(),
})
}
if !*result.Active {
return c.JSON(http.StatusUnauthorized, gocloak.APIError{
Code: 403,
Message: "Invalid or expired Token",
})
}
return next(c)
}
}
func extractBearerToken(token string) string {
return strings.Replace(token, "Bearer ", "", 1)
}
func (auth *directGrantMiddleware) CheckScope(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
token := ""
if auth.customHeaderName != nil {
token = c.Request().Header.Get(*auth.customHeaderName)
}
if token == "" {
token = c.Request().Header.Get("Authorization")
}
if token == "" {
return c.JSON(http.StatusUnauthorized, gocloak.APIError{
Code: 403,
Message: "Authorization header missing",
})
}
token = extractBearerToken(token)
claims := &jwx.Claims{}
_, err := auth.gocloak.DecodeAccessTokenCustomClaims(auth.ctx, token, auth.realm, "", claims)
if err != nil {
return c.JSON(http.StatusUnauthorized, gocloak.APIError{
Code: 403,
Message: "Invalid or malformed token",
})
}
if !strings.Contains(claims.Scope, auth.allowedScope) {
return c.JSON(http.StatusForbidden, gocloak.APIError{
Code: http.StatusForbidden,
Message: "Insufficient permissions to access the requested resource",
})
}
return next(c)
}
}