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// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package asymkey
import (
"bytes"
"context"
"fmt"
"strings"
"code.gitea.io/gitea/models/db"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"github.com/42wim/sshsig"
)
// ParseCommitWithSSHSignature check if signature is good against keystore.
func ParseCommitWithSSHSignature(ctx context.Context, c *git.Commit, committer *user_model.User) *CommitVerification {
// Now try to associate the signature with the committer, if present
if committer.ID != 0 {
keys, err := ListPublicKeys(ctx, committer.ID, db.ListOptions{})
if err != nil { // Skipping failed to get ssh keys of user
log.Error("ListPublicKeys: %v", err)
return &CommitVerification{
CommittingUser: committer,
Verified: false,
Reason: "gpg.error.failed_retrieval_gpg_keys",
}
}
committerEmailAddresses, err := user_model.GetEmailAddresses(ctx, committer.ID)
if err != nil {
log.Error("GetEmailAddresses: %v", err)
}
activated := false
for _, e := range committerEmailAddresses {
if e.IsActivated && strings.EqualFold(e.Email, c.Committer.Email) {
activated = true
break
}
}
for _, k := range keys {
if k.Verified && activated {
commitVerification := verifySSHCommitVerification(c.Signature.Signature, c.Signature.Payload, k, committer, committer, c.Committer.Email)
if commitVerification != nil {
return commitVerification
}
}
}
}
return &CommitVerification{
CommittingUser: committer,
Verified: false,
Reason: NoKeyFound,
}
}
func verifySSHCommitVerification(sig, payload string, k *PublicKey, committer, signer *user_model.User, email string) *CommitVerification {
if err := sshsig.Verify(bytes.NewBuffer([]byte(payload)), []byte(sig), []byte(k.Content), "git"); err != nil {
return nil
}
return &CommitVerification{ // Everything is ok
CommittingUser: committer,
Verified: true,
Reason: fmt.Sprintf("%s / %s", signer.Name, k.Fingerprint),
SigningUser: signer,
SigningSSHKey: k,
SigningEmail: email,
}
}
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