forked from hashicorp/vault
/
backend.go
196 lines (161 loc) · 3.71 KB
/
backend.go
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package socket
import (
"bytes"
"fmt"
"net"
"strconv"
"sync"
"time"
multierror "github.com/hashicorp/go-multierror"
"github.com/hashicorp/vault/audit"
"github.com/hashicorp/vault/helper/duration"
"github.com/hashicorp/vault/logical"
)
func Factory(conf *audit.BackendConfig) (audit.Backend, error) {
if conf.Salt == nil {
return nil, fmt.Errorf("nil salt passed in")
}
address, ok := conf.Config["address"]
if !ok {
return nil, fmt.Errorf("address is required")
}
socketType, ok := conf.Config["socket_type"]
if !ok {
socketType = "tcp"
}
writeDeadline, ok := conf.Config["write_timeout"]
if !ok {
writeDeadline = "2s"
}
writeDuration, err := duration.ParseDurationSecond(writeDeadline)
if err != nil {
return nil, err
}
format, ok := conf.Config["format"]
if !ok {
format = "json"
}
switch format {
case "json", "jsonx":
default:
return nil, fmt.Errorf("unknown format type %s", format)
}
// Check if hashing of accessor is disabled
hmacAccessor := true
if hmacAccessorRaw, ok := conf.Config["hmac_accessor"]; ok {
value, err := strconv.ParseBool(hmacAccessorRaw)
if err != nil {
return nil, err
}
hmacAccessor = value
}
// Check if raw logging is enabled
logRaw := false
if raw, ok := conf.Config["log_raw"]; ok {
b, err := strconv.ParseBool(raw)
if err != nil {
return nil, err
}
logRaw = b
}
conn, err := net.Dial(socketType, address)
if err != nil {
return nil, err
}
b := &Backend{
connection: conn,
formatConfig: audit.FormatterConfig{
Raw: logRaw,
Salt: conf.Salt,
HMACAccessor: hmacAccessor,
},
writeDuration: writeDuration,
address: address,
socketType: socketType,
}
switch format {
case "json":
b.formatter.AuditFormatWriter = &audit.JSONFormatWriter{}
case "jsonx":
b.formatter.AuditFormatWriter = &audit.JSONxFormatWriter{}
}
return b, nil
}
// Backend is the audit backend for the socket audit transport.
type Backend struct {
connection net.Conn
formatter audit.AuditFormatter
formatConfig audit.FormatterConfig
writeDuration time.Duration
address string
socketType string
sync.Mutex
}
func (b *Backend) GetHash(data string) string {
return audit.HashString(b.formatConfig.Salt, data)
}
func (b *Backend) LogRequest(auth *logical.Auth, req *logical.Request, outerErr error) error {
var buf bytes.Buffer
if err := b.formatter.FormatRequest(&buf, b.formatConfig, auth, req, outerErr); err != nil {
return err
}
b.Lock()
defer b.Unlock()
err := b.write(buf.Bytes())
if err != nil {
rErr := b.reconnect()
if rErr != nil {
err = multierror.Append(err, rErr)
} else {
// Try once more after reconnecting
err = b.write(buf.Bytes())
}
}
return err
}
func (b *Backend) LogResponse(auth *logical.Auth, req *logical.Request,
resp *logical.Response, outerErr error) error {
var buf bytes.Buffer
if err := b.formatter.FormatResponse(&buf, b.formatConfig, auth, req, resp, outerErr); err != nil {
return err
}
b.Lock()
defer b.Unlock()
err := b.write(buf.Bytes())
if err != nil {
rErr := b.reconnect()
if rErr != nil {
err = multierror.Append(err, rErr)
} else {
// Try once more after reconnecting
err = b.write(buf.Bytes())
}
}
return err
}
func (b *Backend) write(buf []byte) error {
err := b.connection.SetWriteDeadline(time.Now().Add(b.writeDuration))
if err != nil {
return err
}
_, err = b.connection.Write(buf)
if err != nil {
return err
}
return err
}
func (b *Backend) reconnect() error {
conn, err := net.Dial(b.socketType, b.address)
if err != nil {
return err
}
b.connection.Close()
b.connection = conn
return nil
}
func (b *Backend) Reload() error {
b.Lock()
defer b.Unlock()
err := b.reconnect()
return err
}