cmd: add ca-signed tool.

Verify certificates are signed by a CA.
This commit is contained in:
2025-11-14 14:39:29 -08:00
parent beccb551e2
commit 83c95d9db8
6 changed files with 390 additions and 0 deletions

40
cmd/ca-signed/README.txt Normal file
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ca-signed
---------
Description
ca-signed verifies whether one or more certificates are signed by a given
Certificate Authority (CA). It prints a concise status per input certificate
along with the certificates expiration date when validation succeeds.
Usage
ca-signed CA.pem cert1.pem [cert2.pem ...]
- CA.pem: A file containing one or more CA certificates in PEM, DER, or PKCS#7/PKCS#12 formats.
- certN.pem: A file containing the end-entity (leaf) certificate to verify. If the file contains a chain,
the first certificate is treated as the leaf and the remaining ones are used as intermediates.
Output format
For each input certificate file, one line is printed:
<filename>: OK (expires YYYY-MM-DD)
<filename>: INVALID
Special self-test mode
ca-signed selftest
Runs a built-in test suite using embedded certificates. This mode requires no
external files or network access. The program exits with code 0 if all tests
pass, or a non-zero exit code if any test fails. Example output lines include
whether validation succeeds and the leafs expiration when applicable.
Examples
# Verify a server certificate against a root CA
ca-signed isrg-root-x1.pem le-e7.pem
# Run the embedded self-test suite
ca-signed selftest
Notes
- The tool attempts to parse certificates in PEM first, then falls back to
DER/PKCS#7/PKCS#12 (with an empty password) where applicable.
- Expiration is shown for the leaf certificate only.
- In selftest mode, test certificates are compiled into the binary using go:embed.

233
cmd/ca-signed/main.go Normal file
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package main
import (
"crypto/x509"
"embed"
"fmt"
"os"
"path/filepath"
"time"
"git.wntrmute.dev/kyle/goutils/certlib"
)
// loadCertsFromFile attempts to parse certificates from a file that may be in
// PEM or DER/PKCS#7 format. Returns the parsed certificates or an error.
func loadCertsFromFile(path string) ([]*x509.Certificate, error) {
data, err := os.ReadFile(path)
if err != nil {
return nil, err
}
// Try PEM first
if certs, err := certlib.ParseCertificatesPEM(data); err == nil {
return certs, nil
}
// Try DER/PKCS7/PKCS12 (with no password)
if certs, _, err := certlib.ParseCertificatesDER(data, ""); err == nil {
return certs, nil
} else {
return nil, err
}
}
func makePoolFromFile(path string) (*x509.CertPool, error) {
// Try PEM via helper (it builds a pool)
if pool, err := certlib.LoadPEMCertPool(path); err == nil && pool != nil {
return pool, nil
}
// Fallback: read as DER(s), add to a new pool
certs, err := loadCertsFromFile(path)
if err != nil || len(certs) == 0 {
return nil, fmt.Errorf("failed to load CA certificates from %s", path)
}
pool := x509.NewCertPool()
for _, c := range certs {
pool.AddCert(c)
}
return pool, nil
}
//go:embed testdata/*.pem
var embeddedTestdata embed.FS
// loadCertsFromBytes attempts to parse certificates from bytes that may be in
// PEM or DER/PKCS#7 format.
func loadCertsFromBytes(data []byte) ([]*x509.Certificate, error) {
// Try PEM first
if certs, err := certlib.ParseCertificatesPEM(data); err == nil {
return certs, nil
}
// Try DER/PKCS7/PKCS12 (with no password)
if certs, _, err := certlib.ParseCertificatesDER(data, ""); err == nil {
return certs, nil
} else {
return nil, err
}
}
func makePoolFromBytes(data []byte) (*x509.CertPool, error) {
certs, err := loadCertsFromBytes(data)
if err != nil || len(certs) == 0 {
return nil, fmt.Errorf("failed to load CA certificates from embedded bytes")
}
pool := x509.NewCertPool()
for _, c := range certs {
pool.AddCert(c)
}
return pool, nil
}
func verifyAgainstCA(caPool *x509.CertPool, path string) (ok bool, expiry string) {
certs, err := loadCertsFromFile(path)
if err != nil || len(certs) == 0 {
return false, ""
}
leaf := certs[0]
ints := x509.NewCertPool()
if len(certs) > 1 {
for _, ic := range certs[1:] {
ints.AddCert(ic)
}
}
opts := x509.VerifyOptions{
Roots: caPool,
Intermediates: ints,
KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageAny},
}
if _, err := leaf.Verify(opts); err != nil {
return false, ""
}
return true, leaf.NotAfter.Format("2006-01-02")
}
func verifyAgainstCABytes(caPool *x509.CertPool, certData []byte) (ok bool, expiry string) {
certs, err := loadCertsFromBytes(certData)
if err != nil || len(certs) == 0 {
return false, ""
}
leaf := certs[0]
ints := x509.NewCertPool()
if len(certs) > 1 {
for _, ic := range certs[1:] {
ints.AddCert(ic)
}
}
opts := x509.VerifyOptions{
Roots: caPool,
Intermediates: ints,
KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageAny},
}
if _, err := leaf.Verify(opts); err != nil {
return false, ""
}
return true, leaf.NotAfter.Format("2006-01-02")
}
// selftest runs built-in validation using embedded certificates.
func selftest() int {
type testCase struct {
name string
caFile string
certFile string
expectOK bool
}
cases := []testCase{
{name: "ISRG Root X1 validates LE E7", caFile: "testdata/isrg-root-x1.pem", certFile: "testdata/le-e7.pem", expectOK: true},
{name: "ISRG Root X1 does NOT validate Google WR2", caFile: "testdata/isrg-root-x1.pem", certFile: "testdata/goog-wr2.pem", expectOK: false},
{name: "GTS R1 validates Google WR2", caFile: "testdata/gts-r1.pem", certFile: "testdata/goog-wr2.pem", expectOK: true},
{name: "GTS R1 does NOT validate LE E7", caFile: "testdata/gts-r1.pem", certFile: "testdata/le-e7.pem", expectOK: false},
}
failures := 0
for _, tc := range cases {
caBytes, err := embeddedTestdata.ReadFile(tc.caFile)
if err != nil {
fmt.Fprintf(os.Stderr, "selftest: failed to read embedded %s: %v\n", tc.caFile, err)
failures++
continue
}
certBytes, err := embeddedTestdata.ReadFile(tc.certFile)
if err != nil {
fmt.Fprintf(os.Stderr, "selftest: failed to read embedded %s: %v\n", tc.certFile, err)
failures++
continue
}
pool, err := makePoolFromBytes(caBytes)
if err != nil || pool == nil {
fmt.Fprintf(os.Stderr, "selftest: failed to build CA pool for %s: %v\n", tc.caFile, err)
failures++
continue
}
ok, exp := verifyAgainstCABytes(pool, certBytes)
if ok != tc.expectOK {
fmt.Printf("%s: unexpected result: got %v, want %v\n", tc.name, ok, tc.expectOK)
failures++
} else {
if ok {
fmt.Printf("%s: OK (expires %s)\n", tc.name, exp)
} else {
fmt.Printf("%s: INVALID (as expected)\n", tc.name)
}
}
}
if failures == 0 {
fmt.Println("selftest: PASS")
return 0
}
fmt.Fprintf(os.Stderr, "selftest: FAIL (%d failure(s))\n", failures)
return 1
}
func main() {
// Special selftest mode: single argument "selftest"
if len(os.Args) == 2 && os.Args[1] == "selftest" {
os.Exit(selftest())
}
if len(os.Args) < 3 {
prog := filepath.Base(os.Args[0])
fmt.Fprintf(os.Stderr, "Usage:\n %s ca.pem cert1.pem cert2.pem ...\n %s selftest\n", prog, prog)
os.Exit(2)
}
caPath := os.Args[1]
caPool, err := makePoolFromFile(caPath)
if err != nil || caPool == nil {
fmt.Fprintf(os.Stderr, "failed to load CA certificate(s): %v\n", err)
os.Exit(1)
}
for _, certPath := range os.Args[2:] {
ok, exp := verifyAgainstCA(caPool, certPath)
name := filepath.Base(certPath)
if ok {
// Display with the requested format
// Example: file: OK (expires 2031-01-01)
// Ensure deterministic date formatting
// Note: no timezone displayed; date only as per example
// If exp ended up empty for some reason, recompute safely
if exp == "" {
if certs, err := loadCertsFromFile(certPath); err == nil && len(certs) > 0 {
exp = certs[0].NotAfter.Format("2006-01-02")
} else {
// fallback to the current date to avoid empty; though shouldn't happen
exp = time.Now().Format("2006-01-02")
}
}
fmt.Printf("%s: OK (expires %s)\n", name, exp)
} else {
fmt.Printf("%s: INVALID\n", name)
}
}
}

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cmd/ca-signed/testdata/goog-wr2.pem vendored Normal file
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-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

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cmd/ca-signed/testdata/gts-r1.pem vendored Normal file
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-----END CERTIFICATE-----

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cmd/ca-signed/testdata/isrg-root-x1.pem vendored Normal file
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@@ -0,0 +1,31 @@
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-----END CERTIFICATE-----

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cmd/ca-signed/testdata/le-e7.pem vendored Normal file
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-----END CERTIFICATE-----