-
Notifications
You must be signed in to change notification settings - Fork 9
/
authorization.go
152 lines (127 loc) · 3.42 KB
/
authorization.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
package authorization
import (
"fmt"
"github.com/casbin/casbin"
"github.com/madappgang/identifo/model"
strCasbin "github.com/qiangmzsx/string-adapter"
)
// NewAuthorizer creates a new Authorizer.
func NewAuthorizer() *Authorizer {
return &Authorizer{
internalAuthorizers: make(map[string]*casbin.Enforcer),
}
}
// Authorizer is an entity that authorizes users to an app.
type Authorizer struct {
internalAuthorizers map[string]*casbin.Enforcer
}
const anonymousRole = "anonymous"
// AuthzInfo holds all the data to perform authorization.
type AuthzInfo struct {
App model.AppData
UserRole string
ResourceURI string
Method string
}
// Authorize performs authorization.
func (az *Authorizer) Authorize(azi AuthzInfo) error {
if az == nil {
return nil
}
switch azi.App.AuthzWay {
case model.NoAuthz, "":
return nil
case model.RolesWhitelist:
return az.authorizeWhitelist(azi)
case model.RolesBlacklist:
return az.authorizeBlacklist(azi)
case model.Internal:
return az.authorizeInternal(azi)
case model.External:
return model.ErrorNotImplemented
}
return nil
}
func (az *Authorizer) authorizeWhitelist(azi AuthzInfo) error {
whitelist := azi.App.RolesWhitelist
if whitelist == nil {
err := fmt.Errorf("Access denied")
return err
}
role := azi.UserRole
if role == "" {
role = anonymousRole
}
if accessGranted := contains(whitelist, role); !accessGranted {
err := fmt.Errorf("Access denied")
return err
}
return nil
}
func (az *Authorizer) authorizeBlacklist(azi AuthzInfo) error {
blacklist := azi.App.RolesBlacklist
if blacklist == nil {
return nil
}
role := azi.UserRole
if role == "" {
role = anonymousRole
}
if accessDenied := contains(blacklist, role); accessDenied {
err := fmt.Errorf("Access denied")
return err
}
return nil
}
// authorizeInternal performs authorization based on the model and policy rules,
// which are stored in the application entity as strings.
/* Example model:
`[request_definition]
r = sub, obj, act
[policy_definition]
p = sub, obj, act
[policy_effect]
e = some(where (p.eft == allow))
[matchers]
m = r.sub == p.sub && r.obj == p.obj && r.act == p.act`
*/
/* Example policy:
`p, admin, /auth/login, POST
p, manager, /auth/phone_login, POST
p, manager, /auth/federated, POST
p, anonymous, /auth/register, POST`
*/
func (az *Authorizer) authorizeInternal(azi AuthzInfo) error {
authorizer, err := az.initInternalAuthorizer(azi.App)
if err != nil {
err = fmt.Errorf("Cannot init internal authorizer for app %s: %s", azi.App.ID, err)
return err
}
sub := azi.UserRole
if sub == "" {
sub = anonymousRole
}
obj := azi.ResourceURI
act := azi.Method
if accessGranted := authorizer.Enforce(sub, obj, act); !accessGranted {
err := fmt.Errorf("Access denied")
return err
}
return nil
}
func (az *Authorizer) initInternalAuthorizer(app model.AppData) (*casbin.Enforcer, error) {
authorizer, ok := az.internalAuthorizers[app.ID]
if ok {
return authorizer, nil
}
// If authorizer has not been initialized already, try initializing it.
modelStr, policyStr := app.AuthzModel, app.AuthzPolicy
if len(modelStr) == 0 || len(policyStr) == 0 {
return nil, fmt.Errorf("Either authz model or policy is empty for app %s, or both", app.ID)
}
strAdapter := strCasbin.NewAdapter(policyStr)
authorizer = casbin.NewEnforcer(casbin.NewModel(modelStr), strAdapter)
az.internalAuthorizers[app.ID] = authorizer
authorizer.EnableLog(true)
return authorizer, nil
}