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x509.go
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x509.go
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// Copyright (c) Contributors to the Apptainer project, established as
// Apptainer a Series of LF Projects LLC.
// For website terms of use, trademark policy, privacy policy and other
// project policies see https://lfprojects.org/policies
// Copyright (c) 2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package cli
import (
"bytes"
"crypto/x509"
"encoding/pem"
"errors"
"os"
)
var errFailedToDecodePEM = errors.New("failed to decode PEM")
// loadCertificate returns the certificate read from path.
func loadCertificate(path string) (*x509.Certificate, error) {
b, err := os.ReadFile(path)
if err != nil {
return nil, err
}
p, _ := pem.Decode(b)
if p == nil {
return nil, errFailedToDecodePEM
}
return x509.ParseCertificate(p.Bytes)
}
// loadCertificatePool returns the pool of certificates read from path.
func loadCertificatePool(path string) (*x509.CertPool, error) {
b, err := os.ReadFile(path)
if err != nil {
return nil, err
}
pool := x509.NewCertPool()
for rest := bytes.TrimSpace(b); len(rest) > 0; {
var p *pem.Block
if p, rest = pem.Decode(rest); p == nil {
return nil, errFailedToDecodePEM
}
c, err := x509.ParseCertificate(p.Bytes)
if err != nil {
return nil, err
}
pool.AddCert(c)
}
return pool, nil
}