forked from hashicorp/consul-template
/
vault_write.go
180 lines (152 loc) · 4.29 KB
/
vault_write.go
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package dependency
import (
"crypto/sha1"
"fmt"
"io"
"log"
"net/url"
"sort"
"strings"
"time"
"github.com/hashicorp/vault/api"
"github.com/pkg/errors"
)
var (
// Ensure implements
_ Dependency = (*VaultWriteQuery)(nil)
)
// VaultWriteQuery is the dependency to Vault for a secret
type VaultWriteQuery struct {
stopCh chan struct{}
path string
data map[string]interface{}
dataHash string
secret *Secret
// vaultSecret is the actual Vault secret which we are renewing
vaultSecret *api.Secret
}
// NewVaultWriteQuery creates a new datacenter dependency.
func NewVaultWriteQuery(s string, d map[string]interface{}) (*VaultWriteQuery, error) {
s = strings.TrimSpace(s)
s = strings.Trim(s, "/")
if s == "" {
return nil, fmt.Errorf("vault.write: invalid format: %q", s)
}
return &VaultWriteQuery{
stopCh: make(chan struct{}, 1),
path: s,
data: d,
dataHash: sha1Map(d),
}, nil
}
// Fetch queries the Vault API
func (d *VaultWriteQuery) Fetch(clients *ClientSet, opts *QueryOptions) (interface{}, *ResponseMetadata, error) {
select {
case <-d.stopCh:
return nil, nil, ErrStopped
default:
}
opts = opts.Merge(&QueryOptions{})
if d.secret != nil {
if vaultSecretRenewable(d.secret) {
log.Printf("[TRACE] %s: starting renewer", d)
renewer, err := clients.Vault().NewRenewer(&api.RenewerInput{
Grace: opts.VaultGrace,
Secret: d.vaultSecret,
})
if err != nil {
return nil, nil, errors.Wrap(err, d.String())
}
go renewer.Renew()
defer renewer.Stop()
RENEW:
for {
select {
case err := <-renewer.DoneCh():
if err != nil {
log.Printf("[WARN] %s: failed to renew: %s", d, err)
}
log.Printf("[WARN] %s: renewer returned (maybe the lease expired)", d)
break RENEW
case renewal := <-renewer.RenewCh():
log.Printf("[TRACE] %s: successfully renewed", d)
printVaultWarnings(d, renewal.Secret.Warnings)
updateSecret(d.secret, renewal.Secret)
case <-d.stopCh:
return nil, nil, ErrStopped
}
}
} else {
// The secret isn't renewable, probably the generic secret backend.
dur := vaultRenewDuration(d.secret)
log.Printf("[TRACE] %s: secret is not renewable, sleeping for %s", d, dur)
select {
case <-time.After(dur):
// The lease is almost expired, it's time to request a new one.
case <-d.stopCh:
return nil, nil, ErrStopped
}
}
}
// We don't have a secret, or the prior renewal failed
vaultSecret, err := d.writeSecret(clients, opts)
if err != nil {
return nil, nil, errors.Wrap(err, d.String())
}
// Print any warnings
printVaultWarnings(d, vaultSecret.Warnings)
// Create the cloned secret which will be exposed to the template.
d.vaultSecret = vaultSecret
d.secret = transformSecret(vaultSecret)
return respWithMetadata(d.secret)
}
// CanShare returns if this dependency is shareable.
func (d *VaultWriteQuery) CanShare() bool {
return false
}
// Stop halts the given dependency's fetch.
func (d *VaultWriteQuery) Stop() {
close(d.stopCh)
}
// String returns the human-friendly version of this dependency.
func (d *VaultWriteQuery) String() string {
return fmt.Sprintf("vault.write(%s -> %s)", d.path, d.dataHash)
}
// Type returns the type of this dependency.
func (d *VaultWriteQuery) Type() Type {
return TypeVault
}
// sha1Map returns the sha1 hash of the data in the map. The reason this data is
// hashed is because it appears in the output and could contain sensitive
// information.
func sha1Map(m map[string]interface{}) string {
keys := make([]string, 0, len(m))
for k, _ := range m {
keys = append(keys, k)
}
sort.Strings(keys)
h := sha1.New()
for _, k := range keys {
io.WriteString(h, fmt.Sprintf("%s=%q", k, m[k]))
}
return fmt.Sprintf("%.4x", h.Sum(nil))
}
func (d *VaultWriteQuery) printWarnings(warnings []string) {
for _, w := range warnings {
log.Printf("[WARN] %s: %s", d, w)
}
}
func (d *VaultWriteQuery) writeSecret(clients *ClientSet, opts *QueryOptions) (*api.Secret, error) {
log.Printf("[TRACE] %s: PUT %s", d, &url.URL{
Path: "/v1/" + d.path,
RawQuery: opts.String(),
})
vaultSecret, err := clients.Vault().Logical().Write(d.path, d.data)
if err != nil {
return nil, errors.Wrap(err, d.String())
}
if vaultSecret == nil {
return nil, fmt.Errorf("no secret exists at %s", d.path)
}
return vaultSecret, nil
}