99 lines
2.3 KiB
Go
99 lines
2.3 KiB
Go
package sandbox
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import (
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"fmt"
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"os"
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"sort"
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)
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// pathEntry holds a path with its permission type
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type pathEntry struct {
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path string
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flag string // --ro, --rox, --rw, --rwx
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}
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// isAvailableFn is overridable for testing.
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var (
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isAvailableFn = isAvailable
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)
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// ErrNotAvailable is returned when landrun is not found on the system.
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var ErrNotAvailable = fmt.Errorf("SANDBOX FAILURE: landrun is not installed or not in PATH — shell CANNOT run without it")
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// WrapCommand wraps a command with landrun based on the configuration.
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// Returns an error if landrun is not available.
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func WrapCommand(cfg *Config, originalCmd []string, cwd string, getenv EnvFunc) ([]string, error) {
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if !isAvailableFn() {
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return nil, ErrNotAvailable
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}
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args := []string{"landrun"}
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if cfg.General.LogLevel != "" {
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args = append(args, "--log-level", cfg.General.LogLevel)
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}
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if cfg.General.BestEffort {
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args = append(args, "--best-effort")
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}
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if cfg.Advanced.LDD {
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args = append(args, "--ldd")
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}
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if cfg.Advanced.AddExec {
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args = append(args, "--add-exec")
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}
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var entries []pathEntry
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addPaths := func(paths []string, flag string) {
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for _, path := range paths {
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p := expandPath(path, cwd, getenv)
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if p != "" && pathExists(p) {
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entries = append(entries, pathEntry{p, flag})
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}
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}
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}
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addPaths(cfg.Filesystem.RO, "--ro")
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addPaths(cfg.Filesystem.ROX, "--rox")
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addPaths(cfg.Filesystem.RW, "--rw")
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addPaths(cfg.Filesystem.RWX, "--rwx")
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// Sort so parents come before children
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sort.Slice(entries, func(i, j int) bool {
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if len(entries[i].path) != len(entries[j].path) {
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return len(entries[i].path) < len(entries[j].path)
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}
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return entries[i].path < entries[j].path
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})
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for _, e := range entries {
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args = append(args, e.flag, e.path)
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}
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if cfg.Network.Unrestricted {
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args = append(args, "--unrestricted-network")
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} else if cfg.Network.Enabled {
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for _, port := range cfg.Network.BindTCP {
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args = append(args, "--bind-tcp", port)
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}
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for _, port := range cfg.Network.ConnectTCP {
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args = append(args, "--connect-tcp", port)
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}
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}
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for _, name := range cfg.Env {
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args = append(args, "--env", name)
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}
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args = append(args, "--")
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args = append(args, originalCmd...)
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return args, nil
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}
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// pathExists checks if a file or directory exists
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func pathExists(path string) bool {
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_, err := os.Stat(path)
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return err == nil
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}
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