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server.go
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server.go
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package command
import (
"encoding/hex"
"fmt"
"log"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"runtime"
"sort"
"strconv"
"strings"
"syscall"
"time"
"github.com/armon/go-metrics"
"github.com/armon/go-metrics/circonus"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/go-multierror"
"github.com/hashicorp/logutils"
"github.com/hashicorp/vault/audit"
"github.com/hashicorp/vault/command/server"
"github.com/hashicorp/vault/helper/flag-slice"
"github.com/hashicorp/vault/helper/gated-writer"
"github.com/hashicorp/vault/helper/mlock"
vaulthttp "github.com/hashicorp/vault/http"
"github.com/hashicorp/vault/logical"
"github.com/hashicorp/vault/meta"
"github.com/hashicorp/vault/physical"
"github.com/hashicorp/vault/vault"
"github.com/hashicorp/vault/version"
)
// ServerCommand is a Command that starts the Vault server.
type ServerCommand struct {
AuditBackends map[string]audit.Factory
CredentialBackends map[string]logical.Factory
LogicalBackends map[string]logical.Factory
ShutdownCh chan struct{}
SighupCh chan struct{}
meta.Meta
logger *log.Logger
ReloadFuncs map[string][]server.ReloadFunc
}
func (c *ServerCommand) Run(args []string) int {
var dev, verifyOnly bool
var configPath []string
var logLevel, devRootTokenID, devListenAddress string
flags := c.Meta.FlagSet("server", meta.FlagSetDefault)
flags.BoolVar(&dev, "dev", false, "")
flags.StringVar(&devRootTokenID, "dev-root-token-id", "", "")
flags.StringVar(&devListenAddress, "dev-listen-address", "", "")
flags.StringVar(&logLevel, "log-level", "info", "")
flags.BoolVar(&verifyOnly, "verify-only", false, "")
flags.Usage = func() { c.Ui.Error(c.Help()) }
flags.Var((*sliceflag.StringFlag)(&configPath), "config", "config")
if err := flags.Parse(args); err != nil {
return 1
}
if os.Getenv("VAULT_DEV_ROOT_TOKEN_ID") != "" && devRootTokenID == "" {
devRootTokenID = os.Getenv("VAULT_DEV_ROOT_TOKEN_ID")
}
if os.Getenv("VAULT_DEV_LISTEN_ADDRESS") != "" && devListenAddress == "" {
devListenAddress = os.Getenv("VAULT_DEV_LISTEN_ADDRESS")
}
// Validation
if !dev {
switch {
case len(configPath) == 0:
c.Ui.Error("At least one config path must be specified with -config")
flags.Usage()
return 1
case devRootTokenID != "":
c.Ui.Error("Root token ID can only be specified with -dev")
flags.Usage()
return 1
case devListenAddress != "":
c.Ui.Error("Development address can only be specified with -dev")
flags.Usage()
return 1
}
}
// Load the configuration
var config *server.Config
if dev {
config = server.DevConfig()
if devListenAddress != "" {
config.Listeners[0].Config["address"] = devListenAddress
}
}
for _, path := range configPath {
current, err := server.LoadConfig(path)
if err != nil {
c.Ui.Error(fmt.Sprintf(
"Error loading configuration from %s: %s", path, err))
return 1
}
if config == nil {
config = current
} else {
config = config.Merge(current)
}
}
// Ensure at least one config was found.
if config == nil {
c.Ui.Error("No configuration files found.")
return 1
}
// Ensure that a backend is provided
if config.Backend == nil {
c.Ui.Error("A physical backend must be specified")
return 1
}
// If mlockall(2) isn't supported, show a warning. We disable this
// in dev because it is quite scary to see when first using Vault.
if !dev && !mlock.Supported() {
c.Ui.Output("==> WARNING: mlock not supported on this system!\n")
c.Ui.Output(" An `mlockall(2)`-like syscall to prevent memory from being")
c.Ui.Output(" swapped to disk is not supported on this system. Running")
c.Ui.Output(" Vault on an mlockall(2) enabled system is much more secure.\n")
}
// Create a logger. We wrap it in a gated writer so that it doesn't
// start logging too early.
logGate := &gatedwriter.Writer{Writer: os.Stderr}
c.logger = log.New(&logutils.LevelFilter{
Levels: []logutils.LogLevel{
"TRACE", "DEBUG", "INFO", "WARN", "ERR"},
MinLevel: logutils.LogLevel(strings.ToUpper(logLevel)),
Writer: logGate,
}, "", log.LstdFlags)
if err := c.setupTelemetry(config); err != nil {
c.Ui.Error(fmt.Sprintf("Error initializing telemetry: %s", err))
return 1
}
// Initialize the backend
backend, err := physical.NewBackend(
config.Backend.Type, c.logger, config.Backend.Config)
if err != nil {
c.Ui.Error(fmt.Sprintf(
"Error initializing backend of type %s: %s",
config.Backend.Type, err))
return 1
}
infoKeys := make([]string, 0, 10)
info := make(map[string]string)
var seal vault.Seal = &vault.DefaultSeal{}
// Ensure that the seal finalizer is called, even if using verify-only
defer func() {
err = seal.Finalize()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error finalizing seals: %v", err))
}
}()
coreConfig := &vault.CoreConfig{
Physical: backend,
AdvertiseAddr: config.Backend.AdvertiseAddr,
HAPhysical: nil,
Seal: seal,
AuditBackends: c.AuditBackends,
CredentialBackends: c.CredentialBackends,
LogicalBackends: c.LogicalBackends,
Logger: c.logger,
DisableCache: config.DisableCache,
DisableMlock: config.DisableMlock,
MaxLeaseTTL: config.MaxLeaseTTL,
DefaultLeaseTTL: config.DefaultLeaseTTL,
ClusterName: config.ClusterName,
}
// Initialize the separate HA physical backend, if it exists
var ok bool
if config.HABackend != nil {
habackend, err := physical.NewBackend(
config.HABackend.Type, c.logger, config.HABackend.Config)
if err != nil {
c.Ui.Error(fmt.Sprintf(
"Error initializing backend of type %s: %s",
config.HABackend.Type, err))
return 1
}
if coreConfig.HAPhysical, ok = habackend.(physical.HABackend); !ok {
c.Ui.Error("Specified HA backend does not support HA")
return 1
}
if !coreConfig.HAPhysical.HAEnabled() {
c.Ui.Error("Specified HA backend has HA support disabled; please consult documentation")
return 1
}
coreConfig.AdvertiseAddr = config.HABackend.AdvertiseAddr
} else {
if coreConfig.HAPhysical, ok = backend.(physical.HABackend); ok {
coreConfig.AdvertiseAddr = config.Backend.AdvertiseAddr
}
}
if envAA := os.Getenv("VAULT_ADVERTISE_ADDR"); envAA != "" {
coreConfig.AdvertiseAddr = envAA
}
// Attempt to detect the advertise address, if possible
var detect physical.AdvertiseDetect
if coreConfig.HAPhysical != nil && coreConfig.HAPhysical.HAEnabled() {
detect, ok = coreConfig.HAPhysical.(physical.AdvertiseDetect)
} else {
detect, ok = coreConfig.Physical.(physical.AdvertiseDetect)
}
if ok && coreConfig.AdvertiseAddr == "" {
advertise, err := c.detectAdvertise(detect, config)
if err != nil {
c.Ui.Error(fmt.Sprintf("Error detecting advertise address: %s", err))
} else if advertise == "" {
c.Ui.Error("Failed to detect advertise address.")
} else {
coreConfig.AdvertiseAddr = advertise
}
}
// Initialize the core
core, newCoreError := vault.NewCore(coreConfig)
if newCoreError != nil {
if !errwrap.ContainsType(newCoreError, new(vault.NonFatalError)) {
c.Ui.Error(fmt.Sprintf("Error initializing core: %s", newCoreError))
return 1
}
}
// If we're in dev mode, then initialize the core
if dev {
init, err := c.enableDev(core, devRootTokenID)
if err != nil {
c.Ui.Error(fmt.Sprintf(
"Error initializing dev mode: %s", err))
return 1
}
export := "export"
quote := "'"
if runtime.GOOS == "windows" {
export = "set"
quote = ""
}
c.Ui.Output(fmt.Sprintf(
"==> WARNING: Dev mode is enabled!\n\n"+
"In this mode, Vault is completely in-memory and unsealed.\n"+
"Vault is configured to only have a single unseal key. The root\n"+
"token has already been authenticated with the CLI, so you can\n"+
"immediately begin using the Vault CLI.\n\n"+
"The only step you need to take is to set the following\n"+
"environment variables:\n\n"+
" "+export+" VAULT_ADDR="+quote+"http://"+config.Listeners[0].Config["address"]+quote+"\n\n"+
"The unseal key and root token are reproduced below in case you\n"+
"want to seal/unseal the Vault or play with authentication.\n\n"+
"Unseal Key: %s\nRoot Token: %s\n",
hex.EncodeToString(init.SecretShares[0]),
init.RootToken,
))
}
// Compile server information for output later
info["backend"] = config.Backend.Type
info["log level"] = logLevel
info["mlock"] = fmt.Sprintf(
"supported: %v, enabled: %v",
mlock.Supported(), !config.DisableMlock)
infoKeys = append(infoKeys, "log level", "mlock", "backend")
if config.HABackend != nil {
info["HA backend"] = config.HABackend.Type
info["advertise address"] = coreConfig.AdvertiseAddr
infoKeys = append(infoKeys, "HA backend", "advertise address")
} else {
// If the backend supports HA, then note it
if coreConfig.HAPhysical != nil {
if coreConfig.HAPhysical.HAEnabled() {
info["backend"] += " (HA available)"
info["advertise address"] = coreConfig.AdvertiseAddr
infoKeys = append(infoKeys, "advertise address")
} else {
info["backend"] += " (HA disabled)"
}
}
}
// If the backend supports service discovery, run service discovery
if coreConfig.HAPhysical != nil && coreConfig.HAPhysical.HAEnabled() {
sd, ok := coreConfig.HAPhysical.(physical.ServiceDiscovery)
if ok {
activeFunc := func() bool {
if isLeader, _, err := core.Leader(); err == nil {
return isLeader
}
return false
}
sealedFunc := func() bool {
if sealed, err := core.Sealed(); err == nil {
return sealed
}
return true
}
if err := sd.RunServiceDiscovery(c.ShutdownCh, coreConfig.AdvertiseAddr, activeFunc, sealedFunc); err != nil {
c.Ui.Error(fmt.Sprintf("Error initializing service discovery: %v", err))
return 1
}
}
}
// Initialize the listeners
lns := make([]net.Listener, 0, len(config.Listeners))
for i, lnConfig := range config.Listeners {
ln, props, reloadFunc, err := server.NewListener(lnConfig.Type, lnConfig.Config, logGate)
if err != nil {
c.Ui.Error(fmt.Sprintf(
"Error initializing listener of type %s: %s",
lnConfig.Type, err))
return 1
}
// Store the listener props for output later
key := fmt.Sprintf("listener %d", i+1)
propsList := make([]string, 0, len(props))
for k, v := range props {
propsList = append(propsList, fmt.Sprintf(
"%s: %q", k, v))
}
sort.Strings(propsList)
infoKeys = append(infoKeys, key)
info[key] = fmt.Sprintf(
"%s (%s)", lnConfig.Type, strings.Join(propsList, ", "))
lns = append(lns, ln)
if reloadFunc != nil {
relSlice := c.ReloadFuncs["listener|"+lnConfig.Type]
relSlice = append(relSlice, reloadFunc)
c.ReloadFuncs["listener|"+lnConfig.Type] = relSlice
}
}
// Make sure we close all listeners from this point on
defer func() {
for _, ln := range lns {
ln.Close()
}
}()
infoKeys = append(infoKeys, "version")
info["version"] = version.GetVersion().String()
// Server configuration output
padding := 24
sort.Strings(infoKeys)
c.Ui.Output("==> Vault server configuration:\n")
for _, k := range infoKeys {
c.Ui.Output(fmt.Sprintf(
"%s%s: %s",
strings.Repeat(" ", padding-len(k)),
strings.Title(k),
info[k]))
}
c.Ui.Output("")
if verifyOnly {
return 0
}
// Initialize the HTTP server
server := &http.Server{}
server.Handler = vaulthttp.Handler(core)
for _, ln := range lns {
go server.Serve(ln)
}
if newCoreError != nil {
c.Ui.Output("==> Warning:\n\nNon-fatal error during initialization; check the logs for more information.")
c.Ui.Output("")
}
// Output the header that the server has started
c.Ui.Output("==> Vault server started! Log data will stream in below:\n")
// Release the log gate.
logGate.Flush()
// Wait for shutdown
shutdownTriggered := false
for !shutdownTriggered {
select {
case <-c.ShutdownCh:
c.Ui.Output("==> Vault shutdown triggered")
if err := core.Shutdown(); err != nil {
c.Ui.Error(fmt.Sprintf("Error with core shutdown: %s", err))
}
shutdownTriggered = true
case <-c.SighupCh:
c.Ui.Output("==> Vault reload triggered")
if err := c.Reload(configPath); err != nil {
c.Ui.Error(fmt.Sprintf("Error(s) were encountered during reload: %s", err))
}
}
}
return 0
}
func (c *ServerCommand) enableDev(core *vault.Core, rootTokenID string) (*vault.InitResult, error) {
// Initialize it with a basic single key
init, err := core.Initialize(&vault.SealConfig{
SecretShares: 1,
SecretThreshold: 1,
}, nil)
if err != nil {
return nil, err
}
// Copy the key so that it can be zeroed
key := make([]byte, len(init.SecretShares[0]))
copy(key, init.SecretShares[0])
// Unseal the core
unsealed, err := core.Unseal(key)
if err != nil {
return nil, err
}
if !unsealed {
return nil, fmt.Errorf("failed to unseal Vault for dev mode")
}
if rootTokenID != "" {
req := &logical.Request{
Operation: logical.UpdateOperation,
ClientToken: init.RootToken,
Path: "auth/token/create",
Data: map[string]interface{}{
"id": rootTokenID,
"policies": []string{"root"},
"no_parent": true,
"no_default_policy": true,
},
}
resp, err := core.HandleRequest(req)
if err != nil {
return nil, fmt.Errorf("failed to create root token with ID %s: %s", rootTokenID, err)
}
if resp == nil {
return nil, fmt.Errorf("nil response when creating root token with ID %s", rootTokenID)
}
if resp.Auth == nil {
return nil, fmt.Errorf("nil auth when creating root token with ID %s", rootTokenID)
}
init.RootToken = resp.Auth.ClientToken
req.Path = "auth/token/revoke-self"
req.Data = nil
resp, err = core.HandleRequest(req)
if err != nil {
return nil, fmt.Errorf("failed to revoke initial root token: %s", err)
}
}
// Set the token
tokenHelper, err := c.TokenHelper()
if err != nil {
return nil, err
}
if err := tokenHelper.Store(init.RootToken); err != nil {
return nil, err
}
return init, nil
}
// detectAdvertise is used to attempt advertise address detection
func (c *ServerCommand) detectAdvertise(detect physical.AdvertiseDetect,
config *server.Config) (string, error) {
// Get the hostname
host, err := detect.DetectHostAddr()
if err != nil {
return "", err
}
// set [] for ipv6 addresses
if strings.Contains(host, ":") && !strings.Contains(host, "]") {
host = "[" + host + "]"
}
// Default the port and scheme
scheme := "https"
port := 8200
// Attempt to detect overrides
for _, list := range config.Listeners {
// Only attempt TCP
if list.Type != "tcp" {
continue
}
// Check if TLS is disabled
if val, ok := list.Config["tls_disable"]; ok {
disable, err := strconv.ParseBool(val)
if err != nil {
return "", fmt.Errorf("tls_disable: %s", err)
}
if disable {
scheme = "http"
}
}
// Check for address override
addr, ok := list.Config["address"]
if !ok {
addr = "127.0.0.1:8200"
}
// Check for localhost
hostStr, portStr, err := net.SplitHostPort(addr)
if err != nil {
continue
}
if hostStr == "127.0.0.1" {
host = hostStr
}
// Check for custom port
listPort, err := strconv.Atoi(portStr)
if err != nil {
continue
}
port = listPort
}
// Build a URL
url := &url.URL{
Scheme: scheme,
Host: fmt.Sprintf("%s:%d", host, port),
}
// Return the URL string
return url.String(), nil
}
// setupTelemetry is used to setup the telemetry sub-systems
func (c *ServerCommand) setupTelemetry(config *server.Config) error {
/* Setup telemetry
Aggregate on 10 second intervals for 1 minute. Expose the
metrics over stderr when there is a SIGUSR1 received.
*/
inm := metrics.NewInmemSink(10*time.Second, time.Minute)
metrics.DefaultInmemSignal(inm)
var telConfig *server.Telemetry
if config.Telemetry == nil {
telConfig = &server.Telemetry{}
} else {
telConfig = config.Telemetry
}
metricsConf := metrics.DefaultConfig("vault")
metricsConf.EnableHostname = !telConfig.DisableHostname
// Configure the statsite sink
var fanout metrics.FanoutSink
if telConfig.StatsiteAddr != "" {
sink, err := metrics.NewStatsiteSink(telConfig.StatsiteAddr)
if err != nil {
return err
}
fanout = append(fanout, sink)
}
// Configure the statsd sink
if telConfig.StatsdAddr != "" {
sink, err := metrics.NewStatsdSink(telConfig.StatsdAddr)
if err != nil {
return err
}
fanout = append(fanout, sink)
}
// Configure the Circonus sink
if telConfig.CirconusAPIToken != "" || telConfig.CirconusCheckSubmissionURL != "" {
cfg := &circonus.Config{}
cfg.Interval = telConfig.CirconusSubmissionInterval
cfg.CheckManager.API.TokenKey = telConfig.CirconusAPIToken
cfg.CheckManager.API.TokenApp = telConfig.CirconusAPIApp
cfg.CheckManager.API.URL = telConfig.CirconusAPIURL
cfg.CheckManager.Check.SubmissionURL = telConfig.CirconusCheckSubmissionURL
cfg.CheckManager.Check.ID = telConfig.CirconusCheckID
cfg.CheckManager.Check.ForceMetricActivation = telConfig.CirconusCheckForceMetricActivation
cfg.CheckManager.Check.InstanceID = telConfig.CirconusCheckInstanceID
cfg.CheckManager.Check.SearchTag = telConfig.CirconusCheckSearchTag
cfg.CheckManager.Broker.ID = telConfig.CirconusBrokerID
cfg.CheckManager.Broker.SelectTag = telConfig.CirconusBrokerSelectTag
if cfg.CheckManager.API.TokenApp == "" {
cfg.CheckManager.API.TokenApp = "vault"
}
if cfg.CheckManager.Check.SearchTag == "" {
cfg.CheckManager.Check.SearchTag = "service:vault"
}
sink, err := circonus.NewCirconusSink(cfg)
if err != nil {
return err
}
sink.Start()
fanout = append(fanout, sink)
}
// Initialize the global sink
if len(fanout) > 0 {
fanout = append(fanout, inm)
metrics.NewGlobal(metricsConf, fanout)
} else {
metricsConf.EnableHostname = false
metrics.NewGlobal(metricsConf, inm)
}
return nil
}
func (c *ServerCommand) Reload(configPath []string) error {
// Read the new config
var config *server.Config
for _, path := range configPath {
current, err := server.LoadConfig(path)
if err != nil {
retErr := fmt.Errorf("Error loading configuration from %s: %s", path, err)
c.Ui.Error(retErr.Error())
return retErr
}
if config == nil {
config = current
} else {
config = config.Merge(current)
}
}
// Ensure at least one config was found.
if config == nil {
retErr := fmt.Errorf("No configuration files found")
c.Ui.Error(retErr.Error())
return retErr
}
var reloadErrors *multierror.Error
// Call reload on the listeners. This will call each listener with each
// config block, but they verify the address.
for _, lnConfig := range config.Listeners {
for _, relFunc := range c.ReloadFuncs["listener|"+lnConfig.Type] {
if err := relFunc(lnConfig.Config); err != nil {
retErr := fmt.Errorf("Error encountered reloading configuration: %s", err)
reloadErrors = multierror.Append(retErr)
}
}
}
return reloadErrors.ErrorOrNil()
}
func (c *ServerCommand) Synopsis() string {
return "Start a Vault server"
}
func (c *ServerCommand) Help() string {
helpText := `
Usage: vault server [options]
Start a Vault server.
This command starts a Vault server that responds to API requests.
Vault will start in a "sealed" state. The Vault must be unsealed
with "vault unseal" or the API before this server can respond to requests.
This must be done for every server.
If the server is being started against a storage backend that has
brand new (no existing Vault data in it), it must be initialized with
"vault init" or the API first.
General Options:
-config=<path> Path to the configuration file or directory. This can
be specified multiple times. If it is a directory,
all files with a ".hcl" or ".json" suffix will be
loaded.
-dev Enables Dev mode. In this mode, Vault is completely
in-memory and unsealed. Do not run the Dev server in
production!
-dev-root-token-id="" If set, the root token returned in Dev mode will have
the given ID. This *only* has an effect when running
in Dev mode. Can also be specified with the
VAULT_DEV_ROOT_TOKEN_ID environment variable.
-dev-listen-address="" If set, this overrides the normal Dev mode listen
address of "127.0.0.1:8200". Can also be specified
with the VAULT_DEV_LISTEN_ADDRESS environment
variable.
-log-level=info Log verbosity. Defaults to "info", will be output to
stderr. Supported values: "trace", "debug", "info",
"warn", "err"
`
return strings.TrimSpace(helpText)
}
// MakeShutdownCh returns a channel that can be used for shutdown
// notifications for commands. This channel will send a message for every
// SIGINT or SIGTERM received.
func MakeShutdownCh() chan struct{} {
resultCh := make(chan struct{})
shutdownCh := make(chan os.Signal, 4)
signal.Notify(shutdownCh, os.Interrupt, syscall.SIGTERM)
go func() {
for {
<-shutdownCh
resultCh <- struct{}{}
}
}()
return resultCh
}
// MakeSighupCh returns a channel that can be used for SIGHUP
// reloading. This channel will send a message for every
// SIGHUP received.
func MakeSighupCh() chan struct{} {
resultCh := make(chan struct{})
signalCh := make(chan os.Signal, 4)
signal.Notify(signalCh, syscall.SIGHUP)
go func() {
for {
<-signalCh
resultCh <- struct{}{}
}
}()
return resultCh
}