cluster/clustercfg: rewrite it in Go
This replaces the old clustercfg script with a brand spanking new
mostly-equivalent Go reimplementation. But it's not exactly the same,
here are the differences:
1. No cluster deployment logic anymore - we expect everyone to use ops/
machine at this point.
2. All certs/keys are Ed25519 and do not expire by default - but
support for short-lived certificates is there, and is actually more
generic and reusable. Currently it's only used for admincreds.
3. Speaking of admincreds: the new admincreds automatically figure out
your username.
4. admincreds also doesn't shell out to kubectl anymore, and doesn't
override your default context. The generated creds can live
peacefully alongside your normal prodaccess creds.
5. gencerts (the new nodestrap without deployment support) now
automatically generates certs for all nodes, based on local Nix
modules in ops/.
6. No secretstore support. This will be changed once we rebuild
secretstore in Go. For now users are expected to manually run
secretstore sync on cluster/secrets.
Change-Id: Ida935f44e04fd933df125905eee10121ac078495
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1498
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/cluster/clustercfg/certs/x509.go b/cluster/clustercfg/certs/x509.go
new file mode 100644
index 0000000..a64ec1a
--- /dev/null
+++ b/cluster/clustercfg/certs/x509.go
@@ -0,0 +1,98 @@
+package certs
+
+import (
+ "bytes"
+ "crypto/x509"
+ "crypto/x509/pkix"
+ "fmt"
+ "strings"
+ "time"
+)
+
+var (
+ // From RFC 5280 Section 4.1.2.5
+ unknownNotAfter = time.Unix(253402300799, 0)
+)
+
+// compareCertData returns an error if any of the 'important' bits of the two
+// certificates differ. Those are the bits that we template ourselves, and that
+// are not issue-dependent (ie. not time or serial or kid or ...).
+func compareCertData(template, cert *x509.Certificate) error {
+ if want, got := template.Subject.String(), cert.Subject.String(); want != got {
+ return fmt.Errorf("issued for different subject, wanted %s, got %s", want, got)
+ }
+ if want, got := strings.Join(template.DNSNames, ","), strings.Join(cert.DNSNames, ","); want != got {
+ return fmt.Errorf("issued for different DNS names, wanted %s, got %s", want, got)
+ }
+ if want, got := len(template.IPAddresses), len(cert.IPAddresses); want != got {
+ return fmt.Errorf("issued for different IP addresses, wanted %v, got %v", want, got)
+ } else {
+ for i := 0; i < len(template.IPAddresses); i++ {
+ if want, got := template.IPAddresses[i], cert.IPAddresses[i]; !bytes.Equal(want, got) {
+ return fmt.Errorf("issued for different IP addresses, wanted %v, got %v", want, got)
+ }
+ }
+ }
+ if want, got := template.KeyUsage, cert.KeyUsage; want != got {
+ return fmt.Errorf("issued for different key usage, wanted %d, got %d", want, got)
+ }
+ if want, got := len(template.ExtKeyUsage), len(cert.ExtKeyUsage); want != got {
+ return fmt.Errorf("issued for different ext key usage, wanted %v, got %v", want, got)
+ } else {
+ for i := 0; i < len(template.ExtKeyUsage); i++ {
+ if want, got := template.ExtKeyUsage[i], cert.ExtKeyUsage[i]; want != got {
+ return fmt.Errorf("issued for different ext key usage, wanted %v, got %v", want, got)
+ }
+ }
+ }
+ if want, got := template.IsCA, cert.IsCA; want != got {
+ return fmt.Errorf("issued for different IsCA, wanted %v, got %v", want, got)
+ }
+ if want, got := template.BasicConstraintsValid, cert.BasicConstraintsValid; want != got {
+ return fmt.Errorf("issued for different basic constraints valid, wanted %v, got %v", want, got)
+ }
+ return nil
+}
+
+// template builds an x509 'template' certificate, ie. makes an
+// x509.Certificate with all the fields built up from the data contained in
+// Certificate, but without any per-issue fields like times, serial number,
+// etc.
+func (c *Certificate) template() *x509.Certificate {
+ template := &x509.Certificate{
+ Subject: pkix.Name{
+ CommonName: c.cn,
+ },
+ DNSNames: c.san,
+ IPAddresses: c.ips,
+ }
+ if c.o != "" {
+ template.Subject.Organization = []string{c.o}
+ }
+ switch c.kind {
+ case kindServer:
+ template.KeyUsage = x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
+ template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}
+ template.DNSNames = c.san
+ case kindClient:
+ template.KeyUsage = x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
+ template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth}
+ template.DNSNames = c.san
+ case kindClientServer:
+ template.KeyUsage = x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
+ template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}
+ case kindCA:
+ template.IsCA = true
+ template.BasicConstraintsValid = true
+ template.KeyUsage = x509.KeyUsageCertSign | x509.KeyUsageCRLSign | x509.KeyUsageDigitalSignature
+ template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageOCSPSigning}
+ template.AuthorityKeyId = template.SubjectKeyId
+ case kindProdvider:
+ template.IsCA = true
+ template.BasicConstraintsValid = true
+ template.KeyUsage = x509.KeyUsageCertSign | x509.KeyUsageCRLSign | x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
+ template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageOCSPSigning}
+ template.AuthorityKeyId = template.SubjectKeyId
+ }
+ return template
+}