316 lines
8.5 KiB
Go
316 lines
8.5 KiB
Go
package command
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import (
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"context"
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/hashicorp/vault/api"
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"github.com/mitchellh/cli"
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"github.com/posener/complete"
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)
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var (
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_ cli.Command = (*KVPatchCommand)(nil)
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_ cli.CommandAutocomplete = (*KVPatchCommand)(nil)
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)
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type KVPatchCommand struct {
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*BaseCommand
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flagCAS int
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flagMethod string
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testStdin io.Reader // for tests
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}
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func (c *KVPatchCommand) Synopsis() string {
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return "Sets or updates data in the KV store without overwriting"
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}
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func (c *KVPatchCommand) Help() string {
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helpText := `
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Usage: vault kv patch [options] KEY [DATA]
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*NOTE*: This is only supported for KV v2 engine mounts.
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Writes the data to the given path in the key-value store. The data can be of
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any type.
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$ vault kv patch secret/foo bar=baz
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The data can also be consumed from a file on disk by prefixing with the "@"
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symbol. For example:
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$ vault kv patch secret/foo @data.json
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Or it can be read from stdin using the "-" symbol:
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$ echo "abcd1234" | vault kv patch secret/foo bar=-
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To perform a Check-And-Set operation, specify the -cas flag with the
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appropriate version number corresponding to the key you want to perform
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the CAS operation on:
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$ vault kv patch -cas=1 secret/foo bar=baz
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By default, this operation will attempt an HTTP PATCH operation. If your
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policy does not allow that, it will fall back to a read/local update/write approach.
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If you wish to specify which method this command should use, you may do so
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with the -method flag. When -method=patch is specified, only an HTTP PATCH
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operation will be tried. If it fails, the entire command will fail.
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$ vault kv patch -method=patch secret/foo bar=baz
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When -method=rw is specified, only a read/local update/write approach will be tried.
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This was the default behavior previous to Vault 1.9.
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$ vault kv patch -method=rw secret/foo bar=baz
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Additional flags and more advanced use cases are detailed below.
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` + c.Flags().Help()
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return strings.TrimSpace(helpText)
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}
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func (c *KVPatchCommand) Flags() *FlagSets {
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set := c.flagSet(FlagSetHTTP | FlagSetOutputField | FlagSetOutputFormat)
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// Patch specific options
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f := set.NewFlagSet("Common Options")
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f.IntVar(&IntVar{
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Name: "cas",
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Target: &c.flagCAS,
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Default: 0,
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Usage: `Specifies to use a Check-And-Set operation. If set to 0 or not
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set, the patch will be allowed. If the index is non-zero the patch will
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only be allowed if the key’s current version matches the version
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specified in the cas parameter.`,
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})
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f.StringVar(&StringVar{
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Name: "method",
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Target: &c.flagMethod,
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Usage: `Specifies which method of patching to use. If set to "patch", then
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an HTTP PATCH request will be issued. If set to "rw", then a read will be
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performed, then a local update, followed by a remote update.`,
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})
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return set
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}
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func (c *KVPatchCommand) AutocompleteArgs() complete.Predictor {
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return nil
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}
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func (c *KVPatchCommand) AutocompleteFlags() complete.Flags {
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return c.Flags().Completions()
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}
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func (c *KVPatchCommand) Run(args []string) int {
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f := c.Flags()
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if err := f.Parse(args); err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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args = f.Args()
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// Pull our fake stdin if needed
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stdin := (io.Reader)(os.Stdin)
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if c.testStdin != nil {
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stdin = c.testStdin
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}
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switch {
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case len(args) < 1:
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c.UI.Error(fmt.Sprintf("Not enough arguments (expected >1, got %d)", len(args)))
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return 1
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case len(args) == 1:
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c.UI.Error("Must supply data")
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return 1
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}
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var err error
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path := sanitizePath(args[0])
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client, err := c.Client()
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if err != nil {
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c.UI.Error(err.Error())
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return 2
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}
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newData, err := parseArgsData(stdin, args[1:])
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if err != nil {
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c.UI.Error(fmt.Sprintf("Failed to parse K=V data: %s", err))
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return 1
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}
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mountPath, v2, err := isKVv2(path, client)
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if err != nil {
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c.UI.Error(err.Error())
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return 2
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}
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if !v2 {
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c.UI.Error("K/V engine mount must be version 2 for patch support")
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return 2
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}
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path = addPrefixToKVPath(path, mountPath, "data")
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if err != nil {
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c.UI.Error(err.Error())
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return 2
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}
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// Check the method and behave accordingly
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var secret *api.Secret
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var code int
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switch c.flagMethod {
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case "rw":
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secret, code = c.readThenWrite(client, path, newData)
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case "patch":
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secret, code = c.mergePatch(client, path, newData, false)
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case "":
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secret, code = c.mergePatch(client, path, newData, true)
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default:
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c.UI.Error(fmt.Sprintf("Unsupported method provided to -method flag: %s", c.flagMethod))
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return 2
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}
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if code != 0 {
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return code
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}
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return OutputSecret(c.UI, secret)
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}
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func (c *KVPatchCommand) readThenWrite(client *api.Client, path string, newData map[string]interface{}) (*api.Secret, int) {
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// First, do a read.
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// Note that we don't want to see curl output for the read request.
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curOutputCurl := client.OutputCurlString()
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client.SetOutputCurlString(false)
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secret, err := kvReadRequest(client, path, nil)
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client.SetOutputCurlString(curOutputCurl)
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error doing pre-read at %s: %s", path, err))
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return nil, 2
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}
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// Make sure a value already exists
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if secret == nil || secret.Data == nil {
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c.UI.Error(fmt.Sprintf("No value found at %s", path))
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return nil, 2
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}
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// Verify metadata found
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rawMeta, ok := secret.Data["metadata"]
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if !ok || rawMeta == nil {
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c.UI.Error(fmt.Sprintf("No metadata found at %s; patch only works on existing data", path))
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return nil, 2
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}
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meta, ok := rawMeta.(map[string]interface{})
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if !ok {
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c.UI.Error(fmt.Sprintf("Metadata found at %s is not the expected type (JSON object)", path))
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return nil, 2
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}
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if meta == nil {
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c.UI.Error(fmt.Sprintf("No metadata found at %s; patch only works on existing data", path))
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return nil, 2
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}
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// Verify old data found
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rawData, ok := secret.Data["data"]
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if !ok || rawData == nil {
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c.UI.Error(fmt.Sprintf("No data found at %s; patch only works on existing data", path))
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return nil, 2
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}
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data, ok := rawData.(map[string]interface{})
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if !ok {
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c.UI.Error(fmt.Sprintf("Data found at %s is not the expected type (JSON object)", path))
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return nil, 2
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}
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if data == nil {
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c.UI.Error(fmt.Sprintf("No data found at %s; patch only works on existing data", path))
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return nil, 2
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}
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// Copy new data over
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for k, v := range newData {
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data[k] = v
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}
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secret, err = client.Logical().Write(path, map[string]interface{}{
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"data": data,
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"options": map[string]interface{}{
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"cas": meta["version"],
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},
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})
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error writing data to %s: %s", path, err))
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return nil, 2
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}
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if secret == nil {
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// Don't output anything unless using the "table" format
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if Format(c.UI) == "table" {
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c.UI.Info(fmt.Sprintf("Success! Data written to: %s", path))
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}
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return nil, 0
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}
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if c.flagField != "" {
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return nil, PrintRawField(c.UI, secret, c.flagField)
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}
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return secret, 0
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}
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func (c *KVPatchCommand) mergePatch(client *api.Client, path string, newData map[string]interface{}, rwFallback bool) (*api.Secret, int) {
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data := map[string]interface{}{
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"data": newData,
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"options": map[string]interface{}{},
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}
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if c.flagCAS > 0 {
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data["options"].(map[string]interface{})["cas"] = c.flagCAS
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}
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secret, err := client.Logical().JSONMergePatch(context.Background(), path, data)
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if err != nil {
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// If it's a 405, that probably means the server is running a pre-1.9
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// Vault version that doesn't support the HTTP PATCH method.
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// Fall back to the old way of doing it if the user didn't specify a -method.
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// If they did, and it was "patch", then just error.
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if re, ok := err.(*api.ResponseError); ok && re.StatusCode == 405 && rwFallback {
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return c.readThenWrite(client, path, newData)
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}
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// If it's a 403, that probably means they don't have the patch capability in their policy. Fall back to
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// the old way of doing it if the user didn't specify a -method. If they did, and it was "patch", then just error.
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if re, ok := err.(*api.ResponseError); ok && re.StatusCode == 403 && rwFallback {
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c.UI.Warn(fmt.Sprintf("Data was written to %s but we recommend that you add the \"patch\" capability to your ACL policy in order to use HTTP PATCH in the future.", path))
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return c.readThenWrite(client, path, newData)
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}
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c.UI.Error(fmt.Sprintf("Error writing data to %s: %s", path, err))
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return nil, 2
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}
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if secret == nil {
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// Don't output anything unless using the "table" format
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if Format(c.UI) == "table" {
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c.UI.Info(fmt.Sprintf("Success! Data written to: %s", path))
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}
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return nil, 0
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}
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if c.flagField != "" {
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return nil, PrintRawField(c.UI, secret, c.flagField)
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}
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return secret, 0
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}
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