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