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// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package doctor
import (
"bufio"
"bytes"
"context"
"fmt"
"os"
"path/filepath"
"strings"
asymkey_model "code.gitea.io/gitea/models/asymkey"
"code.gitea.io/gitea/modules/container"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
)
const tplCommentPrefix = `# gitea public key`
func checkAuthorizedKeys(ctx context.Context, logger log.Logger, autofix bool) error {
if setting.SSH.StartBuiltinServer || !setting.SSH.CreateAuthorizedKeysFile {
return nil
}
fPath := filepath.Join(setting.SSH.RootPath, "authorized_keys")
f, err := os.Open(fPath)
if err != nil {
if !autofix {
logger.Critical("Unable to open authorized_keys file. ERROR: %v", err)
return fmt.Errorf("Unable to open authorized_keys file. ERROR: %w", err)
}
logger.Warn("Unable to open authorized_keys. (ERROR: %v). Attempting to rewrite...", err)
if err = asymkey_model.RewriteAllPublicKeys(ctx); err != nil {
logger.Critical("Unable to rewrite authorized_keys file. ERROR: %v", err)
return fmt.Errorf("Unable to rewrite authorized_keys file. ERROR: %w", err)
}
}
defer f.Close()
linesInAuthorizedKeys := make(container.Set[string])
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, tplCommentPrefix) {
continue
}
linesInAuthorizedKeys.Add(line)
}
if err = scanner.Err(); err != nil {
return fmt.Errorf("scan: %w", err)
}
// although there is a "defer close" above, here close explicitly before the generating, because it needs to open the file for writing again
_ = f.Close()
// now we regenerate and check if there are any lines missing
regenerated := &bytes.Buffer{}
if err := asymkey_model.RegeneratePublicKeys(ctx, regenerated); err != nil {
logger.Critical("Unable to regenerate authorized_keys file. ERROR: %v", err)
return fmt.Errorf("Unable to regenerate authorized_keys file. ERROR: %w", err)
}
scanner = bufio.NewScanner(regenerated)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, tplCommentPrefix) {
continue
}
if linesInAuthorizedKeys.Contains(line) {
continue
}
if !autofix {
logger.Critical(
"authorized_keys file %q is out of date.\nRegenerate it with:\n\t\"%s\"\nor\n\t\"%s\"",
fPath,
"forgejo admin regenerate keys",
"forgejo doctor check --run authorized-keys --fix")
return fmt.Errorf(`authorized_keys is out of date and should be regenerated with "forgejo admin regenerate keys" or "forgejo doctor check --run authorized-keys --fix"`)
}
logger.Warn("authorized_keys is out of date. Attempting rewrite...")
err = asymkey_model.RewriteAllPublicKeys(ctx)
if err != nil {
logger.Critical("Unable to rewrite authorized_keys file. ERROR: %v", err)
return fmt.Errorf("Unable to rewrite authorized_keys file. ERROR: %w", err)
}
}
return nil
}
func init() {
Register(&Check{
Title: "Check if OpenSSH authorized_keys file is up-to-date",
Name: "authorized-keys",
IsDefault: true,
Run: checkAuthorizedKeys,
Priority: 4,
})
}
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