hscloud/cluster/prodvider/crdb.go
Serge Bazanski 02e1598eb3 cluster/prodvider: emit crdb certs
This emits short-lived user credentials for a `dev-user` in crdb-waw1
any time someone prodaccesses.

Change-Id: I0266a05c1f02225d762cfd2ca61976af0658639d
2021-05-19 22:13:22 +00:00

107 lines
2.7 KiB
Go

package main
import (
"context"
"encoding/pem"
"fmt"
"time"
"github.com/cloudflare/cfssl/config"
"github.com/cloudflare/cfssl/csr"
"github.com/cloudflare/cfssl/helpers"
"github.com/cloudflare/cfssl/signer"
"github.com/cloudflare/cfssl/signer/local"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
pb "code.hackerspace.pl/hscloud/cluster/prodvider/proto"
)
// crdbSigner returns a cfssl signer (CA) for a crdb cluster, by loading the CA
// cert/key from Kubernetes.
func (p *prodvider) crdbSigner(ctx context.Context, cluster string) (*local.Signer, error) {
policy := &config.Signing{
Profiles: map[string]*config.SigningProfile{
"client": &config.SigningProfile{
Usage: []string{"signing", "key encipherment"},
ExpiryString: "30d",
},
},
Default: config.DefaultConfig(),
}
namespace := fmt.Sprintf("crdb-%s", cluster)
secret, err := p.k8s.CoreV1().Secrets(namespace).Get(ctx, "cluster-ca", metav1.GetOptions{})
if err != nil {
return nil, fmt.Errorf("hspki secret get failed: %w", err)
}
parsedCa, err := helpers.ParseCertificatePEM(secret.Data["tls.crt"])
if err != nil {
return nil, fmt.Errorf("when parsing tls.crt: %w", err)
}
priv, err := helpers.ParsePrivateKeyPEMWithPassword(secret.Data["tls.key"], nil)
if err != nil {
return nil, fmt.Errorf("when parsing tls.key: %w", err)
}
return local.NewSigner(priv, parsedCa, signer.DefaultSigAlgo(priv), policy)
}
// crdbCreds returns a crdb certificate/key for an SSO useron a given cluster.
// The returned certificate is valid for connecting to crdb.
func (p *prodvider) crdbCreds(ctx context.Context, username, cluster string) (*pb.CockroachDBKeys_Cluster, error) {
username = fmt.Sprintf("dev-%s", username)
s, err := p.crdbSigner(ctx, cluster)
if err != nil {
return nil, fmt.Errorf("hspkiSigner: %w", err)
}
signerCert, _ := s.Certificate("", "")
req := &csr.CertificateRequest{
CN: username,
KeyRequest: &csr.BasicKeyRequest{
A: "rsa",
S: 4096,
},
Names: []csr.Name{
{
O: "prodvider",
},
},
Hosts: []string{username},
}
g := &csr.Generator{
Validator: func(req *csr.CertificateRequest) error { return nil },
}
csrPEM, keyPEM, err := g.ProcessRequest(req)
if err != nil {
return nil, fmt.Errorf("when making CSR: %w", err)
}
signReq := signer.SignRequest{
Hosts: []string{username},
Request: string(csrPEM),
Profile: "client",
NotAfter: time.Now().Add(9 * time.Hour),
}
certPEM, err := s.Sign(signReq)
if err != nil {
return nil, fmt.Errorf("when issuing certificate: %w", err)
}
caPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: signerCert.Raw})
return &pb.CockroachDBKeys_Cluster{
Name: cluster,
Ca: caPEM,
Cert: certPEM,
Key: keyPEM,
Username: username,
}, nil
}