mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-29 16:02:10 +00:00
71 lines
2.1 KiB
Go
71 lines
2.1 KiB
Go
/*
|
|
# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
*/
|
|
|
|
package oci
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"regexp"
|
|
"strings"
|
|
"syscall"
|
|
)
|
|
|
|
// shellMetachars represents a set of shell metacharacters that are commonly
|
|
// used for shell scripting and may lead to security vulnerabilities if not
|
|
// properly handled.
|
|
//
|
|
// These metacharacters include: | & ; ( ) < > \t \n $ \ `
|
|
const shellMetachars = "|&;()<> \t\n$\\`"
|
|
|
|
type syscallExec struct{}
|
|
|
|
var _ Runtime = (*syscallExec)(nil)
|
|
|
|
// Escape1 escapes shell metacharacters in a single command-line argument.
|
|
func Escape1(arg string) string {
|
|
if strings.ContainsAny(arg, shellMetachars) {
|
|
// Argument contains shell metacharacters. Double quote the
|
|
// argument, and backslash-escape any characters that still have
|
|
// meaning inside of double quotes.
|
|
e := regexp.MustCompile("([$`\"\\\\])").ReplaceAllString(arg, `\$1`)
|
|
return fmt.Sprintf(`"%s"`, e)
|
|
}
|
|
return arg
|
|
}
|
|
|
|
// Escape escapes shell metacharacters in a slice of command-line arguments
|
|
// and returns a new slice containing the escaped arguments.
|
|
func Escape(args []string) []string {
|
|
escaped := make([]string, len(args))
|
|
for i := range args {
|
|
escaped[i] = Escape1(args[i])
|
|
}
|
|
return escaped
|
|
}
|
|
|
|
func (r syscallExec) Exec(args []string) error {
|
|
args = Escape(args)
|
|
err := syscall.Exec(args[0], args, os.Environ()) //nolint:gosec
|
|
if err != nil {
|
|
return fmt.Errorf("could not exec '%v': %v", args[0], err)
|
|
}
|
|
|
|
// syscall.Exec is not expected to return. This is an error state regardless of whether
|
|
// err is nil or not.
|
|
return fmt.Errorf("unexpected return from exec '%v'", args[0])
|
|
}
|