mirror of
https://github.com/go-gitea/gitea
synced 2024-11-01 15:54:25 +00:00
307 lines
9.1 KiB
Go
307 lines
9.1 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Copyright 2016 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package cmd
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import (
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"fmt"
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"net/http"
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"net/url"
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"os"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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"time"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/pprof"
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"code.gitea.io/gitea/modules/private"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/services/lfs"
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"github.com/golang-jwt/jwt"
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jsoniter "github.com/json-iterator/go"
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"github.com/kballard/go-shellquote"
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"github.com/urfave/cli"
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)
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const (
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lfsAuthenticateVerb = "git-lfs-authenticate"
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)
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// CmdServ represents the available serv sub-command.
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var CmdServ = cli.Command{
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Name: "serv",
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Usage: "This command should only be called by SSH shell",
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Description: `Serv provide access auth for repositories`,
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Action: runServ,
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Flags: []cli.Flag{
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cli.BoolFlag{
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Name: "enable-pprof",
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},
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cli.BoolFlag{
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Name: "debug",
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},
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},
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}
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func setup(logPath string, debug bool) {
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_ = log.DelLogger("console")
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if debug {
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_ = log.NewLogger(1000, "console", "console", `{"level":"trace","stacktracelevel":"NONE","stderr":true}`)
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} else {
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_ = log.NewLogger(1000, "console", "console", `{"level":"fatal","stacktracelevel":"NONE","stderr":true}`)
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}
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setting.NewContext()
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if debug {
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setting.RunMode = "dev"
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}
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}
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var (
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allowedCommands = map[string]models.AccessMode{
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"git-upload-pack": models.AccessModeRead,
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"git-upload-archive": models.AccessModeRead,
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"git-receive-pack": models.AccessModeWrite,
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lfsAuthenticateVerb: models.AccessModeNone,
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}
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alphaDashDotPattern = regexp.MustCompile(`[^\w-\.]`)
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)
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func fail(userMessage, logMessage string, args ...interface{}) error {
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// There appears to be a chance to cause a zombie process and failure to read the Exit status
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// if nothing is outputted on stdout.
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fmt.Fprintln(os.Stdout, "")
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fmt.Fprintln(os.Stderr, "Gitea:", userMessage)
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if len(logMessage) > 0 {
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if !setting.IsProd() {
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fmt.Fprintf(os.Stderr, logMessage+"\n", args...)
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}
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}
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ctx, cancel := installSignals()
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defer cancel()
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if len(logMessage) > 0 {
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_ = private.SSHLog(ctx, true, fmt.Sprintf(logMessage+": ", args...))
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}
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return cli.NewExitError(fmt.Sprintf("Gitea: %s", userMessage), 1)
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}
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func runServ(c *cli.Context) error {
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ctx, cancel := installSignals()
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defer cancel()
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// FIXME: This needs to internationalised
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setup("serv.log", c.Bool("debug"))
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if setting.SSH.Disabled {
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println("Gitea: SSH has been disabled")
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return nil
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}
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if len(c.Args()) < 1 {
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if err := cli.ShowSubcommandHelp(c); err != nil {
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fmt.Printf("error showing subcommand help: %v\n", err)
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}
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return nil
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}
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keys := strings.Split(c.Args()[0], "-")
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if len(keys) != 2 || keys[0] != "key" {
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return fail("Key ID format error", "Invalid key argument: %s", c.Args()[0])
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}
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keyID, err := strconv.ParseInt(keys[1], 10, 64)
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if err != nil {
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return fail("Key ID format error", "Invalid key argument: %s", c.Args()[1])
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}
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cmd := os.Getenv("SSH_ORIGINAL_COMMAND")
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if len(cmd) == 0 {
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key, user, err := private.ServNoCommand(ctx, keyID)
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if err != nil {
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return fail("Internal error", "Failed to check provided key: %v", err)
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}
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switch key.Type {
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case models.KeyTypeDeploy:
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println("Hi there! You've successfully authenticated with the deploy key named " + key.Name + ", but Gitea does not provide shell access.")
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case models.KeyTypePrincipal:
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println("Hi there! You've successfully authenticated with the principal " + key.Content + ", but Gitea does not provide shell access.")
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default:
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println("Hi there, " + user.Name + "! You've successfully authenticated with the key named " + key.Name + ", but Gitea does not provide shell access.")
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}
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println("If this is unexpected, please log in with password and setup Gitea under another user.")
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return nil
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} else if c.Bool("debug") {
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log.Debug("SSH_ORIGINAL_COMMAND: %s", os.Getenv("SSH_ORIGINAL_COMMAND"))
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}
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words, err := shellquote.Split(cmd)
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if err != nil {
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return fail("Error parsing arguments", "Failed to parse arguments: %v", err)
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}
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if len(words) < 2 {
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return fail("Too few arguments", "Too few arguments in cmd: %s", cmd)
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}
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verb := words[0]
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repoPath := words[1]
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if repoPath[0] == '/' {
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repoPath = repoPath[1:]
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}
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var lfsVerb string
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if verb == lfsAuthenticateVerb {
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if !setting.LFS.StartServer {
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return fail("Unknown git command", "LFS authentication request over SSH denied, LFS support is disabled")
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}
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if len(words) > 2 {
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lfsVerb = words[2]
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}
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}
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// LowerCase and trim the repoPath as that's how they are stored.
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repoPath = strings.ToLower(strings.TrimSpace(repoPath))
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rr := strings.SplitN(repoPath, "/", 2)
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if len(rr) != 2 {
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return fail("Invalid repository path", "Invalid repository path: %v", repoPath)
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}
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username := strings.ToLower(rr[0])
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reponame := strings.ToLower(strings.TrimSuffix(rr[1], ".git"))
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if alphaDashDotPattern.MatchString(reponame) {
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return fail("Invalid repo name", "Invalid repo name: %s", reponame)
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}
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if setting.EnablePprof || c.Bool("enable-pprof") {
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if err := os.MkdirAll(setting.PprofDataPath, os.ModePerm); err != nil {
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return fail("Error while trying to create PPROF_DATA_PATH", "Error while trying to create PPROF_DATA_PATH: %v", err)
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}
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stopCPUProfiler, err := pprof.DumpCPUProfileForUsername(setting.PprofDataPath, username)
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if err != nil {
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return fail("Internal Server Error", "Unable to start CPU profile: %v", err)
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}
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defer func() {
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stopCPUProfiler()
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err := pprof.DumpMemProfileForUsername(setting.PprofDataPath, username)
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if err != nil {
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_ = fail("Internal Server Error", "Unable to dump Mem Profile: %v", err)
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}
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}()
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}
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requestedMode, has := allowedCommands[verb]
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if !has {
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return fail("Unknown git command", "Unknown git command %s", verb)
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}
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if verb == lfsAuthenticateVerb {
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if lfsVerb == "upload" {
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requestedMode = models.AccessModeWrite
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} else if lfsVerb == "download" {
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requestedMode = models.AccessModeRead
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} else {
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return fail("Unknown LFS verb", "Unknown lfs verb %s", lfsVerb)
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}
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}
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results, err := private.ServCommand(ctx, keyID, username, reponame, requestedMode, verb, lfsVerb)
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if err != nil {
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if private.IsErrServCommand(err) {
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errServCommand := err.(private.ErrServCommand)
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if errServCommand.StatusCode != http.StatusInternalServerError {
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return fail("Unauthorized", "%s", errServCommand.Error())
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}
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return fail("Internal Server Error", "%s", errServCommand.Error())
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}
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return fail("Internal Server Error", "%s", err.Error())
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}
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os.Setenv(models.EnvRepoIsWiki, strconv.FormatBool(results.IsWiki))
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os.Setenv(models.EnvRepoName, results.RepoName)
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os.Setenv(models.EnvRepoUsername, results.OwnerName)
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os.Setenv(models.EnvPusherName, results.UserName)
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os.Setenv(models.EnvPusherEmail, results.UserEmail)
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os.Setenv(models.EnvPusherID, strconv.FormatInt(results.UserID, 10))
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os.Setenv(models.EnvRepoID, strconv.FormatInt(results.RepoID, 10))
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os.Setenv(models.EnvPRID, fmt.Sprintf("%d", 0))
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os.Setenv(models.EnvIsDeployKey, fmt.Sprintf("%t", results.IsDeployKey))
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os.Setenv(models.EnvKeyID, fmt.Sprintf("%d", results.KeyID))
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os.Setenv(models.EnvAppURL, setting.AppURL)
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//LFS token authentication
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if verb == lfsAuthenticateVerb {
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url := fmt.Sprintf("%s%s/%s.git/info/lfs", setting.AppURL, url.PathEscape(results.OwnerName), url.PathEscape(results.RepoName))
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now := time.Now()
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claims := lfs.Claims{
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StandardClaims: jwt.StandardClaims{
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ExpiresAt: now.Add(setting.LFS.HTTPAuthExpiry).Unix(),
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NotBefore: now.Unix(),
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},
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RepoID: results.RepoID,
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Op: lfsVerb,
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UserID: results.UserID,
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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// Sign and get the complete encoded token as a string using the secret
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tokenString, err := token.SignedString(setting.LFS.JWTSecretBytes)
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if err != nil {
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return fail("Internal error", "Failed to sign JWT token: %v", err)
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}
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tokenAuthentication := &models.LFSTokenResponse{
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Header: make(map[string]string),
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Href: url,
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}
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tokenAuthentication.Header["Authorization"] = fmt.Sprintf("Bearer %s", tokenString)
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json := jsoniter.ConfigCompatibleWithStandardLibrary
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enc := json.NewEncoder(os.Stdout)
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err = enc.Encode(tokenAuthentication)
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if err != nil {
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return fail("Internal error", "Failed to encode LFS json response: %v", err)
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}
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return nil
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}
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// Special handle for Windows.
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if setting.IsWindows {
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verb = strings.Replace(verb, "-", " ", 1)
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}
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var gitcmd *exec.Cmd
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verbs := strings.Split(verb, " ")
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if len(verbs) == 2 {
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gitcmd = exec.CommandContext(ctx, verbs[0], verbs[1], repoPath)
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} else {
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gitcmd = exec.CommandContext(ctx, verb, repoPath)
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}
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gitcmd.Dir = setting.RepoRootPath
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gitcmd.Stdout = os.Stdout
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gitcmd.Stdin = os.Stdin
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gitcmd.Stderr = os.Stderr
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if err = gitcmd.Run(); err != nil {
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return fail("Internal error", "Failed to execute git command: %v", err)
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}
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// Update user key activity.
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if results.KeyID > 0 {
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if err = private.UpdatePublicKeyInRepo(ctx, results.KeyID, results.RepoID); err != nil {
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return fail("Internal error", "UpdatePublicKeyInRepo: %v", err)
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}
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}
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return nil
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}
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