mirror of
https://github.com/tailscale/tailscale.git
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122bd667dc
This makes a "modified externally" error turn into a "modified externally" warning. It means CI won't fail if someone does something manually in the admin console. Signed-off-by: Xe <xe@tailscale.com>
367 lines
8.9 KiB
Go
367 lines
8.9 KiB
Go
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Command gitops-pusher allows users to use a GitOps flow for managing Tailscale ACLs.
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//
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// See README.md for more details.
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package main
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import (
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"context"
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"crypto/sha256"
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"encoding/json"
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"flag"
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"fmt"
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"log"
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"net/http"
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"os"
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"regexp"
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"strings"
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"time"
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"github.com/peterbourgon/ff/v3/ffcli"
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"github.com/tailscale/hujson"
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)
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var (
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rootFlagSet = flag.NewFlagSet("gitops-pusher", flag.ExitOnError)
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policyFname = rootFlagSet.String("policy-file", "./policy.hujson", "filename for policy file")
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cacheFname = rootFlagSet.String("cache-file", "./version-cache.json", "filename for the previous known version hash")
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timeout = rootFlagSet.Duration("timeout", 5*time.Minute, "timeout for the entire CI run")
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githubSyntax = rootFlagSet.Bool("github-syntax", true, "use GitHub Action error syntax (https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-error-message)")
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)
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func modifiedExternallyError() {
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if *githubSyntax {
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fmt.Printf("::warning file=%s,line=1,col=1,title=Policy File Modified Externally::The policy file was modified externally in the admin console.\n", *policyFname)
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} else {
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fmt.Printf("The policy file was modified externally in the admin console.\n")
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}
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}
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func apply(cache *Cache, tailnet, apiKey string) func(context.Context, []string) error {
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return func(ctx context.Context, args []string) error {
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controlEtag, err := getACLETag(ctx, tailnet, apiKey)
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if err != nil {
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return err
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}
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localEtag, err := sumFile(*policyFname)
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if err != nil {
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return err
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}
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if cache.PrevETag == "" {
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log.Println("no previous etag found, assuming local file is correct and recording that")
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cache.PrevETag = localEtag
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}
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log.Printf("control: %s", controlEtag)
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log.Printf("local: %s", localEtag)
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log.Printf("cache: %s", cache.PrevETag)
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if cache.PrevETag != controlEtag {
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modifiedExternallyError()
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}
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if controlEtag == localEtag {
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cache.PrevETag = localEtag
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log.Println("no update needed, doing nothing")
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return nil
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}
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if err := applyNewACL(ctx, tailnet, apiKey, *policyFname, controlEtag); err != nil {
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return err
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}
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cache.PrevETag = localEtag
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return nil
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}
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}
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func test(cache *Cache, tailnet, apiKey string) func(context.Context, []string) error {
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return func(ctx context.Context, args []string) error {
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controlEtag, err := getACLETag(ctx, tailnet, apiKey)
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if err != nil {
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return err
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}
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localEtag, err := sumFile(*policyFname)
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if err != nil {
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return err
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}
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if cache.PrevETag == "" {
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log.Println("no previous etag found, assuming local file is correct and recording that")
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cache.PrevETag = localEtag
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}
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log.Printf("control: %s", controlEtag)
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log.Printf("local: %s", localEtag)
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log.Printf("cache: %s", cache.PrevETag)
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if cache.PrevETag != controlEtag {
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modifiedExternallyError()
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}
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if controlEtag == localEtag {
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log.Println("no updates found, doing nothing")
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return nil
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}
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if err := testNewACLs(ctx, tailnet, apiKey, *policyFname); err != nil {
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return err
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}
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return nil
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}
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}
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func getChecksums(cache *Cache, tailnet, apiKey string) func(context.Context, []string) error {
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return func(ctx context.Context, args []string) error {
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controlEtag, err := getACLETag(ctx, tailnet, apiKey)
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if err != nil {
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return err
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}
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localEtag, err := sumFile(*policyFname)
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if err != nil {
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return err
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}
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if cache.PrevETag == "" {
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log.Println("no previous etag found, assuming local file is correct and recording that")
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cache.PrevETag = Shuck(localEtag)
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}
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log.Printf("control: %s", controlEtag)
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log.Printf("local: %s", localEtag)
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log.Printf("cache: %s", cache.PrevETag)
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return nil
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}
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}
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func main() {
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tailnet, ok := os.LookupEnv("TS_TAILNET")
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if !ok {
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log.Fatal("set envvar TS_TAILNET to your tailnet's name")
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}
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apiKey, ok := os.LookupEnv("TS_API_KEY")
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if !ok {
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log.Fatal("set envvar TS_API_KEY to your Tailscale API key")
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}
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cache, err := LoadCache(*cacheFname)
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if err != nil {
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if os.IsNotExist(err) {
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cache = &Cache{}
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} else {
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log.Fatalf("error loading cache: %v", err)
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}
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}
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defer cache.Save(*cacheFname)
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applyCmd := &ffcli.Command{
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Name: "apply",
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ShortUsage: "gitops-pusher [options] apply",
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ShortHelp: "Pushes changes to CONTROL",
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LongHelp: `Pushes changes to CONTROL`,
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Exec: apply(cache, tailnet, apiKey),
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}
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testCmd := &ffcli.Command{
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Name: "test",
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ShortUsage: "gitops-pusher [options] test",
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ShortHelp: "Tests ACL changes",
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LongHelp: "Tests ACL changes",
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Exec: test(cache, tailnet, apiKey),
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}
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cksumCmd := &ffcli.Command{
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Name: "checksum",
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ShortUsage: "Shows checksums of ACL files",
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ShortHelp: "Fetch checksum of CONTROL's ACL and the local ACL for comparison",
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LongHelp: "Fetch checksum of CONTROL's ACL and the local ACL for comparison",
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Exec: getChecksums(cache, tailnet, apiKey),
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}
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root := &ffcli.Command{
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ShortUsage: "gitops-pusher [options] <command>",
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ShortHelp: "Push Tailscale ACLs to CONTROL using a GitOps workflow",
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Subcommands: []*ffcli.Command{applyCmd, cksumCmd, testCmd},
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FlagSet: rootFlagSet,
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}
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if err := root.Parse(os.Args[1:]); err != nil {
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log.Fatal(err)
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}
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ctx, cancel := context.WithTimeout(context.Background(), *timeout)
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defer cancel()
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if err := root.Run(ctx); err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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}
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func sumFile(fname string) (string, error) {
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data, err := os.ReadFile(fname)
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if err != nil {
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return "", err
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}
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formatted, err := hujson.Format(data)
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if err != nil {
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return "", err
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}
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h := sha256.New()
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_, err = h.Write(formatted)
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("%x", h.Sum(nil)), nil
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}
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func applyNewACL(ctx context.Context, tailnet, apiKey, policyFname, oldEtag string) error {
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fin, err := os.Open(policyFname)
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if err != nil {
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return err
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}
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defer fin.Close()
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("https://api.tailscale.com/api/v2/tailnet/%s/acl", tailnet), fin)
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if err != nil {
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return err
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}
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req.SetBasicAuth(apiKey, "")
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req.Header.Set("Content-Type", "application/hujson")
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req.Header.Set("If-Match", `"`+oldEtag+`"`)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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got := resp.StatusCode
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want := http.StatusOK
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if got != want {
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var ate ACLTestError
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err := json.NewDecoder(resp.Body).Decode(&ate)
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if err != nil {
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return err
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}
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return ate
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}
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return nil
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}
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func testNewACLs(ctx context.Context, tailnet, apiKey, policyFname string) error {
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fin, err := os.Open(policyFname)
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if err != nil {
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return err
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}
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defer fin.Close()
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("https://api.tailscale.com/api/v2/tailnet/%s/acl/validate", tailnet), fin)
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if err != nil {
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return err
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}
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req.SetBasicAuth(apiKey, "")
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req.Header.Set("Content-Type", "application/hujson")
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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var ate ACLTestError
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err = json.NewDecoder(resp.Body).Decode(&ate)
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if err != nil {
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return err
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}
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if len(ate.Message) != 0 || len(ate.Data) != 0 {
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return ate
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}
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got := resp.StatusCode
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want := http.StatusOK
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if got != want {
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return fmt.Errorf("wanted HTTP status code %d but got %d", want, got)
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}
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return nil
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}
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var lineColMessageSplit = regexp.MustCompile(`line ([0-9]+), column ([0-9]+): (.*)$`)
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type ACLTestError struct {
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Message string `json:"message"`
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Data []ACLTestErrorDetail `json:"data"`
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}
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func (ate ACLTestError) Error() string {
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var sb strings.Builder
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if *githubSyntax && lineColMessageSplit.MatchString(ate.Message) {
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sp := lineColMessageSplit.FindStringSubmatch(ate.Message)
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line := sp[1]
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col := sp[2]
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msg := sp[3]
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fmt.Fprintf(&sb, "::error file=%s,line=%s,col=%s::%s", *policyFname, line, col, msg)
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} else {
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fmt.Fprintln(&sb, ate.Message)
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}
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fmt.Fprintln(&sb)
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for _, data := range ate.Data {
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fmt.Fprintf(&sb, "For user %s:\n", data.User)
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for _, err := range data.Errors {
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fmt.Fprintf(&sb, "- %s\n", err)
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}
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}
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return sb.String()
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}
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type ACLTestErrorDetail struct {
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User string `json:"user"`
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Errors []string `json:"errors"`
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}
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func getACLETag(ctx context.Context, tailnet, apiKey string) (string, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, fmt.Sprintf("https://api.tailscale.com/api/v2/tailnet/%s/acl", tailnet), nil)
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if err != nil {
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return "", err
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}
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req.SetBasicAuth(apiKey, "")
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req.Header.Set("Accept", "application/hujson")
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return "", err
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}
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defer resp.Body.Close()
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got := resp.StatusCode
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want := http.StatusOK
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if got != want {
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return "", fmt.Errorf("wanted HTTP status code %d but got %d", want, got)
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}
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return Shuck(resp.Header.Get("ETag")), nil
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}
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