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
|
package secretsengine
import (
"context"
"errors"
"fmt"
"time"
"git.tardisproject.uk/tcmal/vault-plugin-kerberos-secrets/config"
"github.com/hashicorp/vault/sdk/framework"
"github.com/hashicorp/vault/sdk/logical"
)
const (
configStoragePath = "config"
defaultCtxTimeout = 1 * time.Minute
)
// ConfigPaths extends the Vault API with a `/config` endpoint for the backend.
func pathConfig(b *krbBackend) []*framework.Path {
return []*framework.Path{&framework.Path{
Pattern: "config",
Fields: configSchema(),
Operations: map[logical.Operation]framework.OperationHandler{
logical.ReadOperation: &framework.PathOperation{
Callback: b.pathConfigRead,
},
logical.CreateOperation: &framework.PathOperation{
Callback: b.pathConfigWrite,
},
logical.UpdateOperation: &framework.PathOperation{
Callback: b.pathConfigWrite,
},
logical.DeleteOperation: &framework.PathOperation{
Callback: b.pathConfigDelete,
},
},
ExistenceCheck: b.pathConfigExistenceCheck,
HelpSynopsis: pathConfigHelpSynopsis,
HelpDescription: pathConfigHelpDescription,
},
}
}
func configSchema() map[string]*framework.FieldSchema {
return map[string]*framework.FieldSchema{
"realm": {
Type: framework.TypeString,
Description: "The realm to authenticate against",
Required: true,
DisplayAttrs: &framework.DisplayAttributes{
Name: "Realm",
Sensitive: false,
},
},
"username": {
Type: framework.TypeString,
Description: "The username to access kadmin with",
Required: true,
DisplayAttrs: &framework.DisplayAttributes{
Name: "Username",
Sensitive: false,
},
},
"password": {
Type: framework.TypeString,
Description: "The user's password to access kadmin with",
Required: true,
DisplayAttrs: &framework.DisplayAttributes{
Name: "Password",
Sensitive: true,
},
},
"kadmin_server": {
Type: framework.TypeString,
Description: "KAdmin server for the realm",
Required: true,
DisplayAttrs: &framework.DisplayAttributes{
Name: "KAdmin Server",
Sensitive: false,
},
},
}
}
// pathConfigExistenceCheck verifies if the configuration exists.
func (b *krbBackend) pathConfigExistenceCheck(ctx context.Context, req *logical.Request, data *framework.FieldData) (bool, error) {
out, err := req.Storage.Get(ctx, req.Path)
if err != nil {
return false, fmt.Errorf("existence check failed: %w", err)
}
return out != nil, nil
}
// pathConfigRead reads the configuration and outputs non-sensitive information.
func (b *krbBackend) pathConfigRead(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
config, err := getConfig(ctx, req.Storage)
if err != nil {
return nil, err
}
if config == nil {
return nil, fmt.Errorf("config not yet created")
}
return &logical.Response{
Data: map[string]interface{}{
"realm": config.Realm,
"kadmin_server": config.KAdminServer,
"username": config.Username,
},
}, nil
}
// pathConfigWrite updates the configuration for the backend
func (b *krbBackend) pathConfigWrite(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
c, err := getConfig(ctx, req.Storage)
if err != nil {
return nil, err
}
createOperation := (req.Operation == logical.CreateOperation)
if c == nil {
if !createOperation {
return nil, errors.New("config not found during update operation")
}
c = new(config.Config)
}
if realm, ok := data.GetOk("realm"); ok {
c.Realm = realm.(string)
} else if !ok && createOperation {
return nil, fmt.Errorf("missing realm in configuration")
}
if kpasswd_server, ok := data.GetOk("kadmin_server"); ok {
c.KAdminServer = kpasswd_server.(string)
} else if !ok && createOperation {
return nil, fmt.Errorf("missing kadmin server in configuration")
}
if username, ok := data.GetOk("username"); ok {
c.Username = username.(string)
} else if !ok && createOperation {
return nil, fmt.Errorf("missing username in configuration")
}
if password, ok := data.GetOk("password"); ok {
c.Password = password.(string)
} else if !ok && createOperation {
return nil, fmt.Errorf("missing password in configuration")
}
entry, err := logical.StorageEntryJSON(configStoragePath, c)
if err != nil {
return nil, err
}
if err := req.Storage.Put(ctx, entry); err != nil {
return nil, err
}
b.reset()
return nil, nil
}
// pathConfigDelete removes the configuration for the backend
func (b *krbBackend) pathConfigDelete(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
err := req.Storage.Delete(ctx, configStoragePath)
if err == nil {
b.reset()
}
return nil, err
}
func getConfig(ctx context.Context, s logical.Storage) (*config.Config, error) {
entry, err := s.Get(ctx, configStoragePath)
if err != nil {
return nil, err
}
if entry == nil {
return nil, nil
}
c := new(config.Config)
if err := entry.DecodeJSON(&c); err != nil {
return nil, fmt.Errorf("error reading root configuration: %w", err)
}
// return the config, we are done
return c, nil
}
// pathConfigHelpSynopsis summarizes the help text for the configuration
const pathConfigHelpSynopsis = `Configure the Kerberos backend.`
// pathConfigHelpDescription describes the help text for the configuration
const pathConfigHelpDescription = `
The Kerberos secret backend requires credentials and
connection details for the Kerberos servers.
The user provided must be able to create & modify principals
in order for this backend to work correctly.
`
|
