forked from mirror/codeberg-forgejo
135 lines
4.0 KiB
Go
135 lines
4.0 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package asymkey
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"time"
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"code.gitea.io/gitea/models/db"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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)
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// _____ __ .__ .__ .___
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// / _ \ __ ___/ |_| |__ ___________|__|_______ ____ __| _/
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// / /_\ \| | \ __\ | \ / _ \_ __ \ \___ // __ \ / __ |
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// / | \ | /| | | Y ( <_> ) | \/ |/ /\ ___// /_/ |
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// \____|__ /____/ |__| |___| /\____/|__| |__/_____ \\___ >____ |
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// \/ \/ \/ \/ \/
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// __________ .__ .__ .__
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// \______ _______|__| ____ ____ |_____________ | | ______
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// | ___\_ __ | |/ \_/ ___\| \____ \__ \ | | / ___/
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// | | | | \| | | \ \___| | |_> / __ \| |__\___ \
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// |____| |__| |__|___| /\___ |__| __(____ |____/____ >
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// \/ \/ |__| \/ \/
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//
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// This file contains functions for creating authorized_principals files
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//
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// There is a dependence on the database within RewriteAllPrincipalKeys & RegeneratePrincipalKeys
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// The sshOpLocker is used from ssh_key_authorized_keys.go
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const authorizedPrincipalsFile = "authorized_principals"
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// RewriteAllPrincipalKeys removes any authorized principal and rewrite all keys from database again.
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// Note: db.GetEngine(db.DefaultContext).Iterate does not get latest data after insert/delete, so we have to call this function
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// outside any session scope independently.
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func RewriteAllPrincipalKeys(ctx context.Context) error {
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// Don't rewrite key if internal server
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if setting.SSH.StartBuiltinServer || !setting.SSH.CreateAuthorizedPrincipalsFile {
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return nil
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}
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sshOpLocker.Lock()
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defer sshOpLocker.Unlock()
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if setting.SSH.RootPath != "" {
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// First of ensure that the RootPath is present, and if not make it with 0700 permissions
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// This of course doesn't guarantee that this is the right directory for authorized_keys
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// but at least if it's supposed to be this directory and it doesn't exist and we're the
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// right user it will at least be created properly.
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err := os.MkdirAll(setting.SSH.RootPath, 0o700)
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if err != nil {
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log.Error("Unable to MkdirAll(%s): %v", setting.SSH.RootPath, err)
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return err
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}
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}
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fPath := filepath.Join(setting.SSH.RootPath, authorizedPrincipalsFile)
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tmpPath := fPath + ".tmp"
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t, err := os.OpenFile(tmpPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o600)
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if err != nil {
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return err
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}
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defer func() {
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t.Close()
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os.Remove(tmpPath)
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}()
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if setting.SSH.AuthorizedPrincipalsBackup {
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isExist, err := util.IsExist(fPath)
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if err != nil {
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log.Error("Unable to check if %s exists. Error: %v", fPath, err)
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return err
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}
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if isExist {
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bakPath := fmt.Sprintf("%s_%d.gitea_bak", fPath, time.Now().Unix())
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if err = util.CopyFile(fPath, bakPath); err != nil {
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return err
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}
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}
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}
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if err := regeneratePrincipalKeys(ctx, t); err != nil {
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return err
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}
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t.Close()
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return util.Rename(tmpPath, fPath)
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}
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func regeneratePrincipalKeys(ctx context.Context, t io.StringWriter) error {
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if err := db.GetEngine(ctx).Where("type = ?", KeyTypePrincipal).Iterate(new(PublicKey), func(idx int, bean any) (err error) {
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_, err = t.WriteString((bean.(*PublicKey)).AuthorizedString())
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return err
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}); err != nil {
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return err
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}
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fPath := filepath.Join(setting.SSH.RootPath, authorizedPrincipalsFile)
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isExist, err := util.IsExist(fPath)
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if err != nil {
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log.Error("Unable to check if %s exists. Error: %v", fPath, err)
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return err
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}
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if isExist {
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f, err := os.Open(fPath)
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if err != nil {
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return err
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}
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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line := scanner.Text()
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if strings.HasPrefix(line, tplCommentPrefix) {
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scanner.Scan()
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continue
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}
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_, err = t.WriteString(line + "\n")
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if err != nil {
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f.Close()
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return err
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}
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}
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f.Close()
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}
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return nil
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}
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