391 lines
11 KiB
Go
391 lines
11 KiB
Go
// Copyright 2021 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 asymkey
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import (
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"context"
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"fmt"
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"strings"
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asymkey_model "code.gitea.io/gitea/models/asymkey"
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"code.gitea.io/gitea/models/auth"
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"code.gitea.io/gitea/models/db"
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git_model "code.gitea.io/gitea/models/git"
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issues_model "code.gitea.io/gitea/models/issues"
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user_model "code.gitea.io/gitea/models/user"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/process"
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"code.gitea.io/gitea/modules/setting"
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)
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type signingMode string
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const (
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never signingMode = "never"
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always signingMode = "always"
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pubkey signingMode = "pubkey"
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twofa signingMode = "twofa"
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parentSigned signingMode = "parentsigned"
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baseSigned signingMode = "basesigned"
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headSigned signingMode = "headsigned"
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commitsSigned signingMode = "commitssigned"
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approved signingMode = "approved"
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noKey signingMode = "nokey"
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)
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func signingModeFromStrings(modeStrings []string) []signingMode {
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returnable := make([]signingMode, 0, len(modeStrings))
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for _, mode := range modeStrings {
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signMode := signingMode(strings.ToLower(strings.TrimSpace(mode)))
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switch signMode {
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case never:
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return []signingMode{never}
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case always:
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return []signingMode{always}
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case pubkey:
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fallthrough
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case twofa:
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fallthrough
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case parentSigned:
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fallthrough
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case baseSigned:
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fallthrough
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case headSigned:
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fallthrough
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case approved:
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fallthrough
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case commitsSigned:
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returnable = append(returnable, signMode)
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}
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}
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if len(returnable) == 0 {
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return []signingMode{never}
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}
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return returnable
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}
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// ErrWontSign explains the first reason why a commit would not be signed
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// There may be other reasons - this is just the first reason found
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type ErrWontSign struct {
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Reason signingMode
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}
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func (e *ErrWontSign) Error() string {
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return fmt.Sprintf("wont sign: %s", e.Reason)
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}
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// IsErrWontSign checks if an error is a ErrWontSign
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func IsErrWontSign(err error) bool {
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_, ok := err.(*ErrWontSign)
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return ok
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}
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// SigningKey returns the KeyID and git Signature for the repo
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func SigningKey(ctx context.Context, repoPath string) (string, *git.Signature) {
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if setting.Repository.Signing.SigningKey == "none" {
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return "", nil
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}
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if setting.Repository.Signing.SigningKey == "default" || setting.Repository.Signing.SigningKey == "" {
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// Can ignore the error here as it means that commit.gpgsign is not set
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value, _, _ := git.NewCommand(ctx, "config", "--get", "commit.gpgsign").RunStdString(&git.RunOpts{Dir: repoPath})
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sign, valid := git.ParseBool(strings.TrimSpace(value))
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if !sign || !valid {
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return "", nil
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}
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signingKey, _, _ := git.NewCommand(ctx, "config", "--get", "user.signingkey").RunStdString(&git.RunOpts{Dir: repoPath})
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signingName, _, _ := git.NewCommand(ctx, "config", "--get", "user.name").RunStdString(&git.RunOpts{Dir: repoPath})
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signingEmail, _, _ := git.NewCommand(ctx, "config", "--get", "user.email").RunStdString(&git.RunOpts{Dir: repoPath})
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return strings.TrimSpace(signingKey), &git.Signature{
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Name: strings.TrimSpace(signingName),
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Email: strings.TrimSpace(signingEmail),
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}
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}
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return setting.Repository.Signing.SigningKey, &git.Signature{
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Name: setting.Repository.Signing.SigningName,
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Email: setting.Repository.Signing.SigningEmail,
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}
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}
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// PublicSigningKey gets the public signing key within a provided repository directory
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func PublicSigningKey(ctx context.Context, repoPath string) (string, error) {
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signingKey, _ := SigningKey(ctx, repoPath)
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if signingKey == "" {
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return "", nil
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}
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content, stderr, err := process.GetManager().ExecDir(ctx, -1, repoPath,
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"gpg --export -a", "gpg", "--export", "-a", signingKey)
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if err != nil {
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log.Error("Unable to get default signing key in %s: %s, %s, %v", repoPath, signingKey, stderr, err)
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return "", err
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}
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return content, nil
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}
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// SignInitialCommit determines if we should sign the initial commit to this repository
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func SignInitialCommit(ctx context.Context, repoPath string, u *user_model.User) (bool, string, *git.Signature, error) {
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rules := signingModeFromStrings(setting.Repository.Signing.InitialCommit)
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signingKey, sig := SigningKey(ctx, repoPath)
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if signingKey == "" {
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return false, "", nil, &ErrWontSign{noKey}
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}
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Loop:
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for _, rule := range rules {
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switch rule {
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case never:
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return false, "", nil, &ErrWontSign{never}
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case always:
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break Loop
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case pubkey:
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keys, err := asymkey_model.ListGPGKeys(ctx, u.ID, db.ListOptions{})
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if err != nil {
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return false, "", nil, err
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}
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if len(keys) == 0 {
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return false, "", nil, &ErrWontSign{pubkey}
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}
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case twofa:
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twofaModel, err := auth.GetTwoFactorByUID(u.ID)
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if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
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return false, "", nil, err
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}
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if twofaModel == nil {
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return false, "", nil, &ErrWontSign{twofa}
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}
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}
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}
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return true, signingKey, sig, nil
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}
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// SignWikiCommit determines if we should sign the commits to this repository wiki
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func SignWikiCommit(ctx context.Context, repoWikiPath string, u *user_model.User) (bool, string, *git.Signature, error) {
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rules := signingModeFromStrings(setting.Repository.Signing.Wiki)
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signingKey, sig := SigningKey(ctx, repoWikiPath)
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if signingKey == "" {
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return false, "", nil, &ErrWontSign{noKey}
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}
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Loop:
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for _, rule := range rules {
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switch rule {
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case never:
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return false, "", nil, &ErrWontSign{never}
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case always:
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break Loop
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case pubkey:
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keys, err := asymkey_model.ListGPGKeys(ctx, u.ID, db.ListOptions{})
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if err != nil {
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return false, "", nil, err
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}
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if len(keys) == 0 {
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return false, "", nil, &ErrWontSign{pubkey}
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}
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case twofa:
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twofaModel, err := auth.GetTwoFactorByUID(u.ID)
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if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
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return false, "", nil, err
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}
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if twofaModel == nil {
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return false, "", nil, &ErrWontSign{twofa}
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}
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case parentSigned:
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gitRepo, err := git.OpenRepository(ctx, repoWikiPath)
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if err != nil {
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return false, "", nil, err
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}
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defer gitRepo.Close()
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commit, err := gitRepo.GetCommit("HEAD")
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if err != nil {
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return false, "", nil, err
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}
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if commit.Signature == nil {
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return false, "", nil, &ErrWontSign{parentSigned}
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}
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verification := asymkey_model.ParseCommitWithSignature(commit)
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if !verification.Verified {
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return false, "", nil, &ErrWontSign{parentSigned}
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}
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}
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}
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return true, signingKey, sig, nil
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}
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// SignCRUDAction determines if we should sign a CRUD commit to this repository
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func SignCRUDAction(ctx context.Context, repoPath string, u *user_model.User, tmpBasePath, parentCommit string) (bool, string, *git.Signature, error) {
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rules := signingModeFromStrings(setting.Repository.Signing.CRUDActions)
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signingKey, sig := SigningKey(ctx, repoPath)
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if signingKey == "" {
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return false, "", nil, &ErrWontSign{noKey}
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}
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Loop:
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for _, rule := range rules {
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switch rule {
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case never:
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return false, "", nil, &ErrWontSign{never}
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case always:
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break Loop
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case pubkey:
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keys, err := asymkey_model.ListGPGKeys(ctx, u.ID, db.ListOptions{})
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if err != nil {
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return false, "", nil, err
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}
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if len(keys) == 0 {
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return false, "", nil, &ErrWontSign{pubkey}
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}
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case twofa:
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twofaModel, err := auth.GetTwoFactorByUID(u.ID)
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if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
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return false, "", nil, err
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}
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if twofaModel == nil {
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return false, "", nil, &ErrWontSign{twofa}
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}
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case parentSigned:
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gitRepo, err := git.OpenRepository(ctx, tmpBasePath)
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if err != nil {
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return false, "", nil, err
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}
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defer gitRepo.Close()
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commit, err := gitRepo.GetCommit(parentCommit)
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if err != nil {
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return false, "", nil, err
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}
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if commit.Signature == nil {
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return false, "", nil, &ErrWontSign{parentSigned}
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}
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verification := asymkey_model.ParseCommitWithSignature(commit)
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if !verification.Verified {
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return false, "", nil, &ErrWontSign{parentSigned}
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}
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}
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}
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return true, signingKey, sig, nil
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}
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// SignMerge determines if we should sign a PR merge commit to the base repository
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func SignMerge(ctx context.Context, pr *issues_model.PullRequest, u *user_model.User, tmpBasePath, baseCommit, headCommit string) (bool, string, *git.Signature, error) {
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if err := pr.LoadBaseRepo(ctx); err != nil {
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log.Error("Unable to get Base Repo for pull request")
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return false, "", nil, err
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}
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repo := pr.BaseRepo
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signingKey, signer := SigningKey(ctx, repo.RepoPath())
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if signingKey == "" {
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return false, "", nil, &ErrWontSign{noKey}
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}
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rules := signingModeFromStrings(setting.Repository.Signing.Merges)
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var gitRepo *git.Repository
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var err error
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Loop:
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for _, rule := range rules {
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switch rule {
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case never:
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return false, "", nil, &ErrWontSign{never}
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case always:
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break Loop
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case pubkey:
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keys, err := asymkey_model.ListGPGKeys(ctx, u.ID, db.ListOptions{})
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if err != nil {
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return false, "", nil, err
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}
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if len(keys) == 0 {
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return false, "", nil, &ErrWontSign{pubkey}
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}
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case twofa:
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twofaModel, err := auth.GetTwoFactorByUID(u.ID)
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if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
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return false, "", nil, err
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}
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if twofaModel == nil {
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return false, "", nil, &ErrWontSign{twofa}
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}
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case approved:
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protectedBranch, err := git_model.GetProtectedBranchBy(ctx, repo.ID, pr.BaseBranch)
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if err != nil {
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return false, "", nil, err
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}
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if protectedBranch == nil {
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return false, "", nil, &ErrWontSign{approved}
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}
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if issues_model.GetGrantedApprovalsCount(ctx, protectedBranch, pr) < 1 {
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return false, "", nil, &ErrWontSign{approved}
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}
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case baseSigned:
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if gitRepo == nil {
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gitRepo, err = git.OpenRepository(ctx, tmpBasePath)
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if err != nil {
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return false, "", nil, err
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}
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defer gitRepo.Close()
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}
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commit, err := gitRepo.GetCommit(baseCommit)
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if err != nil {
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return false, "", nil, err
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}
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verification := asymkey_model.ParseCommitWithSignature(commit)
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if !verification.Verified {
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return false, "", nil, &ErrWontSign{baseSigned}
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}
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case headSigned:
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if gitRepo == nil {
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gitRepo, err = git.OpenRepository(ctx, tmpBasePath)
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if err != nil {
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return false, "", nil, err
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}
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defer gitRepo.Close()
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}
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commit, err := gitRepo.GetCommit(headCommit)
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if err != nil {
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return false, "", nil, err
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}
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verification := asymkey_model.ParseCommitWithSignature(commit)
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if !verification.Verified {
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return false, "", nil, &ErrWontSign{headSigned}
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}
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case commitsSigned:
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if gitRepo == nil {
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gitRepo, err = git.OpenRepository(ctx, tmpBasePath)
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if err != nil {
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return false, "", nil, err
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}
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defer gitRepo.Close()
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}
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commit, err := gitRepo.GetCommit(headCommit)
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if err != nil {
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return false, "", nil, err
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}
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verification := asymkey_model.ParseCommitWithSignature(commit)
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if !verification.Verified {
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return false, "", nil, &ErrWontSign{commitsSigned}
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}
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// need to work out merge-base
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mergeBaseCommit, _, err := gitRepo.GetMergeBase("", baseCommit, headCommit)
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if err != nil {
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return false, "", nil, err
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}
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commitList, err := commit.CommitsBeforeUntil(mergeBaseCommit)
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if err != nil {
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return false, "", nil, err
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}
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for _, commit := range commitList {
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verification := asymkey_model.ParseCommitWithSignature(commit)
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if !verification.Verified {
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return false, "", nil, &ErrWontSign{commitsSigned}
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}
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}
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}
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}
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return true, signingKey, signer, nil
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}
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