56 lines
1.8 KiB
Go
56 lines
1.8 KiB
Go
//go:build !remote
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package abi
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import (
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"fmt"
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"os"
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"strings"
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"github.com/containers/podman/v5/libpod/define"
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"golang.org/x/sys/unix"
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)
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// getSdNotifyMode returns the `sdNotifyAnnotation/$name` for the specified
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// name. If name is empty, it'll only look for `sdNotifyAnnotation`.
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func getSdNotifyMode(annotations map[string]string, name string) (string, error) {
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var mode string
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switch len(name) {
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case 0:
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mode = annotations[sdNotifyAnnotation]
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default:
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mode = annotations[sdNotifyAnnotation+"/"+name]
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}
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return mode, define.ValidateSdNotifyMode(mode)
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}
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// openPathSafely opens the given name under the trusted root path, the unsafeName
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// must be a single path component and not contain "/".
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// The resulting path will be opened or created if it does not exists.
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// Following of symlink is done within staying under root, escapes outsides
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// of root are not allowed and prevent.
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//
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// This custom function is needed because securejoin.SecureJoin() is not race safe
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// and the volume might be mounted in another container that could swap in a symlink
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// after the function ahs run. securejoin.OpenInRoot() doesn't work either because
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// it cannot create files and doesn't work on freebsd.
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func openPathSafely(root, unsafeName string) (*os.File, error) {
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if strings.Contains(unsafeName, "/") {
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return nil, fmt.Errorf("name %q must not contain path separator", unsafeName)
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}
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fdDir, err := os.OpenFile(root, unix.O_RDONLY, 0)
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if err != nil {
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return nil, err
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}
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defer fdDir.Close()
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flags := unix.O_CREAT | unix.O_WRONLY | unix.O_TRUNC | unix.O_CLOEXEC
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fd, err := unix.Openat(int(fdDir.Fd()), unsafeName, flags|unix.O_NOFOLLOW, 0o644)
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if err == nil {
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return os.NewFile(uintptr(fd), unsafeName), nil
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}
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if err == unix.ELOOP {
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return openSymlinkPath(fdDir, unsafeName, flags)
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}
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return nil, &os.PathError{Op: "openat", Path: unsafeName, Err: err}
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}
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