transport: replace uses of deprecated io/ioutil

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

transport/example/maclient/client.go

@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	"github.com/cloudflare/cfssl/transport"
 	"github.com/cloudflare/cfssl/transport/core"
@@ -25,7 +25,7 @@ func main() {
 	flag.Parse()
 
 	var id = new(core.Identity)
-	data, err := ioutil.ReadFile(conf)
+	data, err := os.ReadFile(conf)
 	if err != nil {
 		exlib.Err(1, err, "reading config file")
 	}

transport/example/maserver/server.go

@@ -3,8 +3,8 @@ package main
 import (
 	"encoding/json"
 	"flag"
-	"io/ioutil"
 	"net"
+	"os"
 
 	"github.com/cloudflare/cfssl/log"
 	"github.com/cloudflare/cfssl/transport"
@@ -23,7 +23,7 @@ func main() {
 	flag.Parse()
 
 	var id = new(core.Identity)
-	data, err := ioutil.ReadFile(conf)
+	data, err := os.ReadFile(conf)
 	if err != nil {
 		exlib.Err(1, err, "reading config file")
 	}

transport/kp/key_provider.go

@@ -22,7 +22,7 @@ import (
 	"crypto/x509"
 	"encoding/pem"
 	"errors"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/cloudflare/cfssl/csr"
@@ -288,7 +288,7 @@ func (sp *StandardProvider) Load() (err error) {
 		}
 	}()
 
-	sp.internal.keyPEM, err = ioutil.ReadFile(sp.Paths.KeyFile)
+	sp.internal.keyPEM, err = os.ReadFile(sp.Paths.KeyFile)
 	if err != nil {
 		return
 	}
@@ -300,7 +300,7 @@ func (sp *StandardProvider) Load() (err error) {
 
 	clearKey = false
 
-	sp.internal.certPEM, err = ioutil.ReadFile(sp.Paths.CertFile)
+	sp.internal.certPEM, err = os.ReadFile(sp.Paths.CertFile)
 	if err != nil {
 		return ErrCertificateUnavailable
 	}
@@ -384,12 +384,12 @@ func (sp *StandardProvider) Store() error {
 		return errors.New("transport: provider does not have a key and certificate")
 	}
 
-	err := ioutil.WriteFile(sp.Paths.CertFile, sp.internal.certPEM, 0644)
+	err := os.WriteFile(sp.Paths.CertFile, sp.internal.certPEM, 0644)
 	if err != nil {
 		return err
 	}
 
-	return ioutil.WriteFile(sp.Paths.KeyFile, sp.internal.keyPEM, 0600)
+	return os.WriteFile(sp.Paths.KeyFile, sp.internal.keyPEM, 0600)
 }
 
 // X509KeyPair returns a tls.Certificate for the provider.

transport/roots/provider.go

@@ -4,7 +4,7 @@ import (
 	"crypto/sha256"
 	"crypto/x509"
 	"errors"
-	"io/ioutil"
+	"os"
 
 	"github.com/cloudflare/cfssl/helpers"
 	"github.com/cloudflare/cfssl/transport/core"
@@ -114,7 +114,7 @@ func TrustPEM(metadata map[string]string) ([]*x509.Certificate, error) {
 		return nil, errors.New("transport: PEM source requires a source file")
 	}
 
-	in, err := ioutil.ReadFile(sourceFile)
+	in, err := os.ReadFile(sourceFile)
 	if err != nil {
 		return nil, err
 	}

transport/roots/system/root_plan9.go

@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build plan9
 // +build plan9
 
 package system
 
 import (
 	"crypto/x509"
-	"io/ioutil"
 )
 
 // Possible certificate files; stop after finding one.
@@ -18,7 +18,7 @@ var certFiles = []string{
 
 func initSystemRoots() (roots []*x509.Certificate) {
 	for _, file := range certFiles {
-		data, err := ioutil.ReadFile(file)
+		data, err := os.ReadFile(file)
 		if err == nil {
 			roots, _ = appendPEM(roots, data)
 			return

transport/roots/system/root_unix.go

@@ -2,13 +2,14 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build dragonfly || freebsd || linux || nacl || netbsd || openbsd || solaris
 // +build dragonfly freebsd linux nacl netbsd openbsd solaris
 
 package system
 
 import (
 	"crypto/x509"
-	"io/ioutil"
+	"os"
 )
 
 // Possible directories with certificate files; stop after successfully
@@ -20,22 +21,22 @@ var certDirectories = []string{
 func initSystemRoots() []*x509.Certificate {
 	var roots []*x509.Certificate
 	for _, file := range certFiles {
-		data, err := ioutil.ReadFile(file)
+		data, err := os.ReadFile(file)
 		if err == nil {
 			roots, _ = appendPEM(roots, data)
 			return roots
 		}
 	}
 
 	for _, directory := range certDirectories {
-		fis, err := ioutil.ReadDir(directory)
+		fis, err := os.ReadDir(directory)
 		if err != nil {
 			continue
 		}
 		rootsAdded := false
 		for _, fi := range fis {
 			var ok bool
-			data, err := ioutil.ReadFile(directory + "/" + fi.Name())
+			data, err := os.ReadFile(directory + "/" + fi.Name())
 			if err == nil {
 				if roots, ok = appendPEM(roots, data); ok {
 					rootsAdded = true