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