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// Copyright 2024 OpenPubkey
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package providers
import (
"context"
"fmt"
"github.com/awnumar/memguard"
"github.com/openpubkey/openpubkey/discover"
simpleoidc "github.com/openpubkey/openpubkey/oidc"
"github.com/openpubkey/openpubkey/pktoken/clientinstance"
)
const gitlabIssuer = "https://gitlab.com"
type GitlabCiOp struct {
issuer string // Change issuer to point this to a test issuer
publicKeyFinder discover.PublicKeyFinder
tokenEnvVar string
requestTokensOverrideFunc func(string) (*simpleoidc.Tokens, error)
}
func NewGitlabCiOpFromEnvironmentDefault() *GitlabCiOp {
return NewGitlabCiOpFromEnvironment("OPENPUBKEY_JWT")
}
func NewGitlabCiOpFromEnvironment(tokenEnvVar string) *GitlabCiOp {
return NewGitlabCiOp(gitlabIssuer, tokenEnvVar)
}
func NewGitlabCiOp(issuer string, tokenEnvVar string) *GitlabCiOp {
op := &GitlabCiOp{
issuer: issuer,
publicKeyFinder: *discover.DefaultPubkeyFinder(),
tokenEnvVar: tokenEnvVar,
requestTokensOverrideFunc: nil,
}
return op
}
func (g *GitlabCiOp) PublicKeyByToken(ctx context.Context, token []byte) (*discover.PublicKeyRecord, error) {
return g.publicKeyFinder.ByToken(ctx, g.issuer, token)
}
func (g *GitlabCiOp) PublicKeyByKeyId(ctx context.Context, keyID string) (*discover.PublicKeyRecord, error) {
return g.publicKeyFinder.ByKeyID(ctx, g.issuer, keyID)
}
func (g *GitlabCiOp) RequestTokens(ctx context.Context, cic *clientinstance.Claims) (*simpleoidc.Tokens, error) {
// Define our commitment as the hash of the client instance claims
cicHash, err := cic.Hash()
if err != nil {
return nil, fmt.Errorf("error calculating client instance claim commitment: %w", err)
}
var idToken []byte
if g.requestTokensOverrideFunc != nil {
noCicHashInIDToken := ""
if tokens, err := g.requestTokensOverrideFunc(noCicHashInIDToken); err != nil {
return nil, fmt.Errorf("error requesting ID Token: %w", err)
} else {
idToken = tokens.IDToken
}
} else {
idTokenStr, err := getEnvVar(g.tokenEnvVar)
if err != nil {
return nil, fmt.Errorf("error requesting ID Token: %w", err)
}
idToken = []byte(idTokenStr)
}
// idTokenLB is the ID Token in a memguard LockedBuffer, this is done
// because the ID Token contains the OPs RSA signature which is a secret
// in GQ signatures. For non-GQ signatures OPs RSA signature is considered
// a public value.
idTokenLB := memguard.NewBufferFromBytes([]byte(idToken))
defer idTokenLB.Destroy()
gqToken, err := CreateGQBoundToken(ctx, idTokenLB.Bytes(), g, string(cicHash))
if err != nil {
return nil, err
}
return &simpleoidc.Tokens{IDToken: []byte(gqToken)}, nil
}
func (g *GitlabCiOp) Issuer() string {
return g.issuer
}
func (g *GitlabCiOp) VerifyIDToken(ctx context.Context, idt []byte, cic *clientinstance.Claims) error {
vp := NewProviderVerifier(g.issuer,
ProviderVerifierOpts{CommitType: CommitTypesEnum.GQ_BOUND, GQOnly: true, SkipClientIDCheck: true},
)
return vp.VerifyIDToken(ctx, idt, cic)
}
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