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// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2016 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package cmd
import (
"context"
"fmt"
"net/http"
"net/url"
"os"
"os/exec"
"path/filepath"
"regexp"
"strconv"
"strings"
"time"
asymkey_model "code.gitea.io/gitea/models/asymkey"
git_model "code.gitea.io/gitea/models/git"
"code.gitea.io/gitea/models/perm"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/pprof"
"code.gitea.io/gitea/modules/private"
"code.gitea.io/gitea/modules/process"
repo_module "code.gitea.io/gitea/modules/repository"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/services/lfs"
"github.com/golang-jwt/jwt/v4"
"github.com/kballard/go-shellquote"
"github.com/urfave/cli"
)
const (
lfsAuthenticateVerb = "git-lfs-authenticate"
)
// CmdServ represents the available serv sub-command.
var CmdServ = cli.Command{
Name: "serv",
Usage: "This command should only be called by SSH shell",
Description: "Serv provides access auth for repositories",
Action: runServ,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "enable-pprof",
},
cli.BoolFlag{
Name: "debug",
},
},
}
func setup(logPath string, debug bool) {
_ = log.DelLogger("console")
if debug {
_ = log.NewLogger(1000, "console", "console", `{"level":"trace","stacktracelevel":"NONE","stderr":true}`)
} else {
_ = log.NewLogger(1000, "console", "console", `{"level":"fatal","stacktracelevel":"NONE","stderr":true}`)
}
setting.InitProviderFromExistingFile()
setting.LoadCommonSettings()
if debug {
setting.RunMode = "dev"
}
// Check if setting.RepoRootPath exists. It could be the case that it doesn't exist, this can happen when
// `[repository]` `ROOT` is a relative path and $GITEA_WORK_DIR isn't passed to the SSH connection.
if _, err := os.Stat(setting.RepoRootPath); err != nil {
if os.IsNotExist(err) {
_ = fail("Incorrect configuration, no repository directory.", "Directory `[repository].ROOT` %q was not found, please check if $GITEA_WORK_DIR is passed to the SSH connection or make `[repository].ROOT` an absolute value.", setting.RepoRootPath)
} else {
_ = fail("Incorrect configuration, repository directory is inaccessible", "Directory `[repository].ROOT` %q is inaccessible. err: %v", setting.RepoRootPath, err)
}
return
}
if err := git.InitSimple(context.Background()); err != nil {
_ = fail("Failed to init git", "Failed to init git, err: %v", err)
}
}
var (
allowedCommands = map[string]perm.AccessMode{
"git-upload-pack": perm.AccessModeRead,
"git-upload-archive": perm.AccessModeRead,
"git-receive-pack": perm.AccessModeWrite,
lfsAuthenticateVerb: perm.AccessModeNone,
}
alphaDashDotPattern = regexp.MustCompile(`[^\w-\.]`)
)
func fail(userMessage, logMessage string, args ...interface{}) error {
// There appears to be a chance to cause a zombie process and failure to read the Exit status
// if nothing is outputted on stdout.
_, _ = fmt.Fprintln(os.Stdout, "")
_, _ = fmt.Fprintln(os.Stderr, "Gitea:", userMessage)
if len(logMessage) > 0 {
if !setting.IsProd {
_, _ = fmt.Fprintf(os.Stderr, logMessage+"\n", args...)
}
}
ctx, cancel := installSignals()
defer cancel()
if len(logMessage) > 0 {
_ = private.SSHLog(ctx, true, fmt.Sprintf(logMessage+": ", args...))
}
return cli.NewExitError("", 1)
}
func runServ(c *cli.Context) error {
ctx, cancel := installSignals()
defer cancel()
// FIXME: This needs to internationalised
setup("serv.log", c.Bool("debug"))
if setting.SSH.Disabled {
println("Gitea: SSH has been disabled")
return nil
}
if len(c.Args()) < 1 {
if err := cli.ShowSubcommandHelp(c); err != nil {
fmt.Printf("error showing subcommand help: %v\n", err)
}
return nil
}
keys := strings.Split(c.Args()[0], "-")
if len(keys) != 2 || keys[0] != "key" {
return fail("Key ID format error", "Invalid key argument: %s", c.Args()[0])
}
keyID, err := strconv.ParseInt(keys[1], 10, 64)
if err != nil {
return fail("Key ID format error", "Invalid key argument: %s", c.Args()[1])
}
cmd := os.Getenv("SSH_ORIGINAL_COMMAND")
if len(cmd) == 0 {
key, user, err := private.ServNoCommand(ctx, keyID)
if err != nil {
return fail("Internal error", "Failed to check provided key: %v", err)
}
switch key.Type {
case asymkey_model.KeyTypeDeploy:
println("Hi there! You've successfully authenticated with the deploy key named " + key.Name + ", but Gitea does not provide shell access.")
case asymkey_model.KeyTypePrincipal:
println("Hi there! You've successfully authenticated with the principal " + key.Content + ", but Gitea does not provide shell access.")
default:
println("Hi there, " + user.Name + "! You've successfully authenticated with the key named " + key.Name + ", but Gitea does not provide shell access.")
}
println("If this is unexpected, please log in with password and setup Gitea under another user.")
return nil
} else if c.Bool("debug") {
log.Debug("SSH_ORIGINAL_COMMAND: %s", os.Getenv("SSH_ORIGINAL_COMMAND"))
}
words, err := shellquote.Split(cmd)
if err != nil {
return fail("Error parsing arguments", "Failed to parse arguments: %v", err)
}
if len(words) < 2 {
if git.CheckGitVersionAtLeast("2.29") == nil {
// for AGit Flow
if cmd == "ssh_info" {
fmt.Print(`{"type":"gitea","version":1}`)
return nil
}
}
return fail("Too few arguments", "Too few arguments in cmd: %s", cmd)
}
verb := words[0]
repoPath := words[1]
if repoPath[0] == '/' {
repoPath = repoPath[1:]
}
var lfsVerb string
if verb == lfsAuthenticateVerb {
if !setting.LFS.StartServer {
return fail("Unknown git command", "LFS authentication request over SSH denied, LFS support is disabled")
}
if len(words) > 2 {
lfsVerb = words[2]
}
}
// LowerCase and trim the repoPath as that's how they are stored.
repoPath = strings.ToLower(strings.TrimSpace(repoPath))
rr := strings.SplitN(repoPath, "/", 2)
if len(rr) != 2 {
return fail("Invalid repository path", "Invalid repository path: %v", repoPath)
}
username := strings.ToLower(rr[0])
reponame := strings.ToLower(strings.TrimSuffix(rr[1], ".git"))
if alphaDashDotPattern.MatchString(reponame) {
return fail("Invalid repo name", "Invalid repo name: %s", reponame)
}
if c.Bool("enable-pprof") {
if err := os.MkdirAll(setting.PprofDataPath, os.ModePerm); err != nil {
return fail("Error while trying to create PPROF_DATA_PATH", "Error while trying to create PPROF_DATA_PATH: %v", err)
}
stopCPUProfiler, err := pprof.DumpCPUProfileForUsername(setting.PprofDataPath, username)
if err != nil {
return fail("Internal Server Error", "Unable to start CPU profile: %v", err)
}
defer func() {
stopCPUProfiler()
err := pprof.DumpMemProfileForUsername(setting.PprofDataPath, username)
if err != nil {
_ = fail("Internal Server Error", "Unable to dump Mem Profile: %v", err)
}
}()
}
requestedMode, has := allowedCommands[verb]
if !has {
return fail("Unknown git command", "Unknown git command %s", verb)
}
if verb == lfsAuthenticateVerb {
if lfsVerb == "upload" {
requestedMode = perm.AccessModeWrite
} else if lfsVerb == "download" {
requestedMode = perm.AccessModeRead
} else {
return fail("Unknown LFS verb", "Unknown lfs verb %s", lfsVerb)
}
}
results, err := private.ServCommand(ctx, keyID, username, reponame, requestedMode, verb, lfsVerb)
if err != nil {
if private.IsErrServCommand(err) {
errServCommand := err.(private.ErrServCommand)
if errServCommand.StatusCode != http.StatusInternalServerError {
return fail("Unauthorized", "%s", errServCommand.Error())
}
return fail("Internal Server Error", "%s", errServCommand.Error())
}
return fail("Internal Server Error", "%s", err.Error())
}
// LFS token authentication
if verb == lfsAuthenticateVerb {
url := fmt.Sprintf("%s%s/%s.git/info/lfs", setting.AppURL, url.PathEscape(results.OwnerName), url.PathEscape(results.RepoName))
now := time.Now()
claims := lfs.Claims{
RegisteredClaims: jwt.RegisteredClaims{
ExpiresAt: jwt.NewNumericDate(now.Add(setting.LFS.HTTPAuthExpiry)),
NotBefore: jwt.NewNumericDate(now),
},
RepoID: results.RepoID,
Op: lfsVerb,
UserID: results.UserID,
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
// Sign and get the complete encoded token as a string using the secret
tokenString, err := token.SignedString(setting.LFS.JWTSecretBytes)
if err != nil {
return fail("Internal error", "Failed to sign JWT token: %v", err)
}
tokenAuthentication := &git_model.LFSTokenResponse{
Header: make(map[string]string),
Href: url,
}
tokenAuthentication.Header["Authorization"] = fmt.Sprintf("Bearer %s", tokenString)
enc := json.NewEncoder(os.Stdout)
err = enc.Encode(tokenAuthentication)
if err != nil {
return fail("Internal error", "Failed to encode LFS json response: %v", err)
}
return nil
}
var gitcmd *exec.Cmd
gitBinPath := filepath.Dir(git.GitExecutable) // e.g. /usr/bin
gitBinVerb := filepath.Join(gitBinPath, verb) // e.g. /usr/bin/git-upload-pack
if _, err := os.Stat(gitBinVerb); err != nil {
// if the command "git-upload-pack" doesn't exist, try to split "git-upload-pack" to use the sub-command with git
// ps: Windows only has "git.exe" in the bin path, so Windows always uses this way
verbFields := strings.SplitN(verb, "-", 2)
if len(verbFields) == 2 {
// use git binary with the sub-command part: "C:\...\bin\git.exe", "upload-pack", ...
gitcmd = exec.CommandContext(ctx, git.GitExecutable, verbFields[1], repoPath)
}
}
if gitcmd == nil {
// by default, use the verb (it has been checked above by allowedCommands)
gitcmd = exec.CommandContext(ctx, gitBinVerb, repoPath)
}
process.SetSysProcAttribute(gitcmd)
gitcmd.Dir = setting.RepoRootPath
gitcmd.Stdout = os.Stdout
gitcmd.Stdin = os.Stdin
gitcmd.Stderr = os.Stderr
gitcmd.Env = append(gitcmd.Env, os.Environ()...)
gitcmd.Env = append(gitcmd.Env,
repo_module.EnvRepoIsWiki+"="+strconv.FormatBool(results.IsWiki),
repo_module.EnvRepoName+"="+results.RepoName,
repo_module.EnvRepoUsername+"="+results.OwnerName,
repo_module.EnvPusherName+"="+results.UserName,
repo_module.EnvPusherEmail+"="+results.UserEmail,
repo_module.EnvPusherID+"="+strconv.FormatInt(results.UserID, 10),
repo_module.EnvRepoID+"="+strconv.FormatInt(results.RepoID, 10),
repo_module.EnvPRID+"="+fmt.Sprintf("%d", 0),
repo_module.EnvDeployKeyID+"="+fmt.Sprintf("%d", results.DeployKeyID),
repo_module.EnvKeyID+"="+fmt.Sprintf("%d", results.KeyID),
repo_module.EnvAppURL+"="+setting.AppURL,
)
// to avoid breaking, here only use the minimal environment variables for the "gitea serv" command.
// it could be re-considered whether to use the same git.CommonGitCmdEnvs() as "git" command later.
gitcmd.Env = append(gitcmd.Env, git.CommonCmdServEnvs()...)
if err = gitcmd.Run(); err != nil {
return fail("Internal error", "Failed to execute git command: %v", err)
}
// Update user key activity.
if results.KeyID > 0 {
if err = private.UpdatePublicKeyInRepo(ctx, results.KeyID, results.RepoID); err != nil {
return fail("Internal error", "UpdatePublicKeyInRepo: %v", err)
}
}
return nil
}
|