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appcreds.go
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appcreds.go
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// Copyright 2019 Aporeto Inc.
// 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.
package appcreds
import (
"context"
"encoding/base64"
"encoding/pem"
"fmt"
"go.aporeto.io/gaia"
"go.aporeto.io/manipulate"
"go.aporeto.io/tg/tglib"
)
// New creates a new *gaia.AppCredential.
func New(ctx context.Context, m manipulate.Manipulator, namespace string, name string, roles []string, subnets []string) (*gaia.AppCredential, error) {
creds := gaia.NewAppCredential()
creds.Name = name
creds.Roles = roles
creds.AuthorizedSubnets = subnets
if err := Create(ctx, m, namespace, creds); err != nil {
return nil, err
}
return creds, nil
}
// Create generates a new CSR for the provided app credential and calls the upstream service using the supplied
// manipulator to provision the app credential. The returned credential will have the private key used to generate the CSR
// added back as an attribute. An error and a nil app cred reference is returned if CSR generation or the API call to the
// upstream service failed.
func Create(ctx context.Context, m manipulate.Manipulator, namespace string, ac *gaia.AppCredential) error {
csr, pk, err := makeCSR()
if err != nil {
return err
}
ac.CSR = string(csr)
if err := m.Create(manipulate.NewContext(ctx, manipulate.ContextOptionNamespace(namespace)), ac); err != nil {
return err
}
ac.Credentials.CertificateKey = base64.StdEncoding.EncodeToString(pk)
return nil
}
// NewWithAppCredential creates a new *gaia.AppCredential from an *AppCredential
// Deprecated: use Create instead
func NewWithAppCredential(ctx context.Context, m manipulate.Manipulator, template *gaia.AppCredential) (*gaia.AppCredential, error) {
fmt.Println("DEPRECATED: NewWithAppCredential is deprecated in favor of Create instead")
csr, pk, err := makeCSR()
if err != nil {
return nil, err
}
creds := gaia.NewAppCredential()
creds.Name = template.Name
creds.Description = template.Description
creds.Roles = template.Roles
creds.Protected = template.Protected
creds.Metadata = template.Metadata
creds.AuthorizedSubnets = template.AuthorizedSubnets
creds.CSR = string(csr)
if err := m.Create(
manipulate.NewContext(
ctx,
manipulate.ContextOptionNamespace(template.Namespace),
),
creds,
); err != nil {
return nil, err
}
creds.Credentials.CertificateKey = base64.StdEncoding.EncodeToString(pk)
return creds, nil
}
// Renew renews the given appcred.
func Renew(ctx context.Context, m manipulate.Manipulator, creds *gaia.AppCredential) (*gaia.AppCredential, error) {
// Then we generate a private key and a CSR from the appcred info.
csr, pk, err := makeCSR()
if err != nil {
return nil, err
}
// And we update the appcred with the csr
creds.CSR = string(csr)
if err = m.Update(
manipulate.NewContext(
ctx,
manipulate.ContextOptionNamespace(creds.Namespace),
),
creds,
); err != nil {
return nil, err
}
// And we write the private key in the appcred.
creds.Credentials.CertificateKey = base64.StdEncoding.EncodeToString(pk)
return creds, nil
}
func makeCSR() (csr []byte, key []byte, err error) {
pk, err := tglib.ECPrivateKeyGenerator()
if err != nil {
return nil, nil, err
}
csr, err = tglib.GenerateSimpleCSR(nil, nil, "", nil, pk)
if err != nil {
return nil, nil, err
}
keyBlock, err := tglib.KeyToPEM(pk)
if err != nil {
return nil, nil, err
}
return csr, pem.EncodeToMemory(keyBlock), nil
}