263 lines
6.7 KiB
Go
263 lines
6.7 KiB
Go
package create
|
|
|
|
import (
|
|
"encoding/json"
|
|
"flag"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"strings"
|
|
|
|
"github.com/hashicorp/consul/api"
|
|
"github.com/hashicorp/consul/command/flags"
|
|
"github.com/hashicorp/consul/command/intention/finder"
|
|
"github.com/mitchellh/cli"
|
|
)
|
|
|
|
func New(ui cli.Ui) *cmd {
|
|
c := &cmd{UI: ui}
|
|
c.init()
|
|
return c
|
|
}
|
|
|
|
type cmd struct {
|
|
UI cli.Ui
|
|
flags *flag.FlagSet
|
|
http *flags.HTTPFlags
|
|
help string
|
|
|
|
// flags
|
|
flagAllow bool
|
|
flagDeny bool
|
|
flagFile bool
|
|
flagReplace bool
|
|
flagMeta map[string]string
|
|
|
|
// testStdin is the input for testing.
|
|
testStdin io.Reader
|
|
}
|
|
|
|
func (c *cmd) init() {
|
|
c.flags = flag.NewFlagSet("", flag.ContinueOnError)
|
|
c.flags.BoolVar(&c.flagAllow, "allow", false,
|
|
"Create an intention that allows when matched.")
|
|
c.flags.BoolVar(&c.flagDeny, "deny", false,
|
|
"Create an intention that denies when matched.")
|
|
c.flags.BoolVar(&c.flagFile, "file", false,
|
|
"Read intention data from one or more files.")
|
|
c.flags.BoolVar(&c.flagReplace, "replace", false,
|
|
"Replace matching intentions.")
|
|
c.flags.Var((*flags.FlagMapValue)(&c.flagMeta), "meta",
|
|
"Metadata to set on the intention, formatted as key=value. This flag "+
|
|
"may be specified multiple times to set multiple meta fields.")
|
|
|
|
c.http = &flags.HTTPFlags{}
|
|
flags.Merge(c.flags, c.http.ClientFlags())
|
|
flags.Merge(c.flags, c.http.ServerFlags())
|
|
c.help = flags.Usage(help, c.flags)
|
|
}
|
|
|
|
func (c *cmd) Run(args []string) int {
|
|
if err := c.flags.Parse(args); err != nil {
|
|
return 1
|
|
}
|
|
|
|
// Default to allow
|
|
if !c.flagAllow && !c.flagDeny {
|
|
c.flagAllow = true
|
|
}
|
|
|
|
// If both are specified it is an error
|
|
if c.flagAllow && c.flagDeny {
|
|
c.UI.Error("Only one of -allow or -deny may be specified.")
|
|
return 1
|
|
}
|
|
|
|
// Check for arg validation
|
|
args = c.flags.Args()
|
|
ixns, err := c.ixnsFromArgs(args)
|
|
if err != nil {
|
|
c.UI.Error(fmt.Sprintf("Error: %s", err))
|
|
return 1
|
|
}
|
|
|
|
// Create and test the HTTP client
|
|
client, err := c.http.APIClient()
|
|
if err != nil {
|
|
c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
|
|
return 1
|
|
}
|
|
|
|
// Create the finder in case we need it
|
|
find := &finder.Finder{Client: client}
|
|
|
|
// Go through and create each intention
|
|
for _, ixn := range ixns {
|
|
// If replace is set to true, then perform an update operation.
|
|
if c.flagReplace {
|
|
oldIxn, err := find.Find(ixn.SourceString(), ixn.DestinationString())
|
|
if err != nil {
|
|
c.UI.Error(fmt.Sprintf(
|
|
"Error looking up intention for replacement with source %q "+
|
|
"and destination %q: %s",
|
|
ixn.SourceString(),
|
|
ixn.DestinationString(),
|
|
err))
|
|
return 1
|
|
}
|
|
if oldIxn != nil {
|
|
// We set the ID of our intention so we overwrite it
|
|
ixn.ID = oldIxn.ID
|
|
|
|
if _, err := client.Connect().IntentionUpdate(ixn, nil); err != nil {
|
|
c.UI.Error(fmt.Sprintf(
|
|
"Error replacing intention with source %q "+
|
|
"and destination %q: %s",
|
|
ixn.SourceString(),
|
|
ixn.DestinationString(),
|
|
err))
|
|
return 1
|
|
}
|
|
|
|
// Continue since we don't want to try to insert a new intention
|
|
continue
|
|
}
|
|
}
|
|
|
|
_, _, err := client.Connect().IntentionCreate(ixn, nil)
|
|
if err != nil {
|
|
c.UI.Error(fmt.Sprintf("Error creating intention %q: %s", ixn, err))
|
|
return 1
|
|
}
|
|
|
|
c.UI.Output(fmt.Sprintf("Created: %s", ixn))
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
// parseIntentionTarget parses a target of the form <namespace>/<name> and returns
|
|
// the two distinct parts. In some cases the namespace may be elided and this function
|
|
// will return the empty string for the namespace then.
|
|
func parseIntentionTarget(input string) (name string, namespace string, err error) {
|
|
// Get the index to the '/'. If it doesn't exist, we have just a name
|
|
// so just set that and return.
|
|
idx := strings.IndexByte(input, '/')
|
|
if idx == -1 {
|
|
// let the agent do token based defaulting of the namespace
|
|
return input, "", nil
|
|
}
|
|
|
|
namespace = input[:idx]
|
|
name = input[idx+1:]
|
|
if strings.IndexByte(name, '/') != -1 {
|
|
return "", "", fmt.Errorf("target can contain at most one '/'")
|
|
}
|
|
|
|
return name, namespace, nil
|
|
}
|
|
|
|
// ixnsFromArgs returns the set of intentions to create based on the arguments
|
|
// given and the flags set. This will call ixnsFromFiles if the -file flag
|
|
// was set.
|
|
func (c *cmd) ixnsFromArgs(args []string) ([]*api.Intention, error) {
|
|
// If we're in file mode, load from files
|
|
if c.flagFile {
|
|
return c.ixnsFromFiles(args)
|
|
}
|
|
|
|
// From args we require exactly two
|
|
if len(args) != 2 {
|
|
return nil, fmt.Errorf("Must specify two arguments: source and destination")
|
|
}
|
|
|
|
srcName, srcNamespace, err := parseIntentionTarget(args[0])
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Invalid intention source: %v", err)
|
|
}
|
|
|
|
dstName, dstNamespace, err := parseIntentionTarget(args[1])
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Invalid intention destination: %v", err)
|
|
}
|
|
|
|
return []*api.Intention{&api.Intention{
|
|
SourceNS: srcNamespace,
|
|
SourceName: srcName,
|
|
DestinationNS: dstNamespace,
|
|
DestinationName: dstName,
|
|
SourceType: api.IntentionSourceConsul,
|
|
Action: c.ixnAction(),
|
|
Meta: c.flagMeta,
|
|
}}, nil
|
|
}
|
|
|
|
func (c *cmd) ixnsFromFiles(args []string) ([]*api.Intention, error) {
|
|
var result []*api.Intention
|
|
for _, path := range args {
|
|
f, err := os.Open(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var ixn api.Intention
|
|
err = json.NewDecoder(f).Decode(&ixn)
|
|
f.Close()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
result = append(result, &ixn)
|
|
}
|
|
|
|
return result, nil
|
|
}
|
|
|
|
// ixnAction returns the api.IntentionAction based on the flag set.
|
|
func (c *cmd) ixnAction() api.IntentionAction {
|
|
if c.flagAllow {
|
|
return api.IntentionActionAllow
|
|
}
|
|
|
|
return api.IntentionActionDeny
|
|
}
|
|
|
|
func (c *cmd) Synopsis() string {
|
|
return synopsis
|
|
}
|
|
|
|
func (c *cmd) Help() string {
|
|
return c.help
|
|
}
|
|
|
|
const synopsis = "Create intentions for service connections."
|
|
const help = `
|
|
Usage: consul intention create [options] SRC DST
|
|
Usage: consul intention create [options] -file FILE...
|
|
|
|
Create one or more intentions. The data can be specified as a single
|
|
source and destination pair or via a set of files when the "-file" flag
|
|
is specified.
|
|
|
|
$ consul intention create web db
|
|
|
|
To consume data from a set of files:
|
|
|
|
$ consul intention create -file one.json two.json
|
|
|
|
When specifying the "-file" flag, "-" may be used once to read from stdin:
|
|
|
|
$ echo "{ ... }" | consul intention create -file -
|
|
|
|
An "allow" intention is created by default (allowlist). To create a
|
|
"deny" intention, the "-deny" flag should be specified.
|
|
|
|
If a conflicting intention is found, creation will fail. To replace any
|
|
conflicting intentions, specify the "-replace" flag. This will replace any
|
|
conflicting intentions with the intention specified in this command.
|
|
Metadata and any other fields of the previous intention will not be
|
|
preserved.
|
|
|
|
Additional flags and more advanced use cases are detailed below.
|
|
`
|