forked from hashicorp/vault
-
Notifications
You must be signed in to change notification settings - Fork 0
/
backend.go
181 lines (148 loc) · 4.07 KB
/
backend.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
package database
import (
"fmt"
"net/rpc"
"strings"
"sync"
log "github.com/mgutz/logxi/v1"
"github.com/hashicorp/vault/builtin/logical/database/dbplugin"
"github.com/hashicorp/vault/logical"
"github.com/hashicorp/vault/logical/framework"
)
const databaseConfigPath = "database/config/"
func Factory(conf *logical.BackendConfig) (logical.Backend, error) {
b := Backend(conf)
if err := b.Setup(conf); err != nil {
return nil, err
}
return b, nil
}
func Backend(conf *logical.BackendConfig) *databaseBackend {
var b databaseBackend
b.Backend = &framework.Backend{
Help: strings.TrimSpace(backendHelp),
Paths: []*framework.Path{
pathListPluginConnection(&b),
pathConfigurePluginConnection(&b),
pathListRoles(&b),
pathRoles(&b),
pathCredsCreate(&b),
pathResetConnection(&b),
},
Secrets: []*framework.Secret{
secretCreds(&b),
},
Clean: b.closeAllDBs,
Invalidate: b.invalidate,
BackendType: logical.TypeLogical,
}
b.logger = conf.Logger
b.connections = make(map[string]dbplugin.Database)
return &b
}
type databaseBackend struct {
connections map[string]dbplugin.Database
logger log.Logger
*framework.Backend
sync.RWMutex
}
// closeAllDBs closes all connections from all database types
func (b *databaseBackend) closeAllDBs() {
b.Lock()
defer b.Unlock()
for _, db := range b.connections {
db.Close()
}
b.connections = make(map[string]dbplugin.Database)
}
// This function is used to retrieve a database object either from the cached
// connection map. The caller of this function needs to hold the backend's read
// lock.
func (b *databaseBackend) getDBObj(name string) (dbplugin.Database, bool) {
db, ok := b.connections[name]
return db, ok
}
// This function creates a new db object from the stored configuration and
// caches it in the connections map. The caller of this function needs to hold
// the backend's write lock
func (b *databaseBackend) createDBObj(s logical.Storage, name string) (dbplugin.Database, error) {
db, ok := b.connections[name]
if ok {
return db, nil
}
config, err := b.DatabaseConfig(s, name)
if err != nil {
return nil, err
}
db, err = dbplugin.PluginFactory(config.PluginName, b.System(), b.logger)
if err != nil {
return nil, err
}
err = db.Initialize(config.ConnectionDetails, true)
if err != nil {
return nil, err
}
b.connections[name] = db
return db, nil
}
func (b *databaseBackend) DatabaseConfig(s logical.Storage, name string) (*DatabaseConfig, error) {
entry, err := s.Get(fmt.Sprintf("config/%s", name))
if err != nil {
return nil, fmt.Errorf("failed to read connection configuration: %s", err)
}
if entry == nil {
return nil, fmt.Errorf("failed to find entry for connection with name: %s", name)
}
var config DatabaseConfig
if err := entry.DecodeJSON(&config); err != nil {
return nil, err
}
return &config, nil
}
func (b *databaseBackend) Role(s logical.Storage, roleName string) (*roleEntry, error) {
entry, err := s.Get("role/" + roleName)
if err != nil {
return nil, err
}
if entry == nil {
return nil, nil
}
var result roleEntry
if err := entry.DecodeJSON(&result); err != nil {
return nil, err
}
return &result, nil
}
func (b *databaseBackend) invalidate(key string) {
b.Lock()
defer b.Unlock()
switch {
case strings.HasPrefix(key, databaseConfigPath):
name := strings.TrimPrefix(key, databaseConfigPath)
b.clearConnection(name)
}
}
// clearConnection closes the database connection and
// removes it from the b.connections map.
func (b *databaseBackend) clearConnection(name string) {
db, ok := b.connections[name]
if ok {
db.Close()
delete(b.connections, name)
}
}
func (b *databaseBackend) closeIfShutdown(name string, err error) {
// Plugin has shutdown, close it so next call can reconnect.
if err == rpc.ErrShutdown {
b.Lock()
b.clearConnection(name)
b.Unlock()
}
}
const backendHelp = `
The database backend supports using many different databases
as secret backends, including but not limited to:
cassandra, mssql, mysql, postgres
After mounting this backend, configure it using the endpoints within
the "database/config/" path.
`