Documentation
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Overview ¶
Package sandbox defines the tenant sandbox capability: one view config, two enforcement mechanisms. Standard kind: sandbox/bwrap (runtime/sandbox).
The view is rendered per call from the tenant identity in ctx: tenant root (rw), global root (ro, secret files masked), neighbor tenants masked, minimal system binds. Consumers:
- Subprocess tools/agents (tool/shell-bwrap, agent/acp-remote) wrap their exec argv with WrapArgv (bwrap mount-namespace isolation);
- In-process tools (filesystem/sandbox decorator → tool/fs-workspace) call CheckRead/CheckWrite, since bwrap cannot confine Go code in the runner.
Note: in-process checks are best-effort — a symlink created between the check and the file operation (TOCTOU) can escape them. Strong isolation comes from the subprocess path (WrapArgv); CheckRead/CheckWrite exist to keep the common model-tool flow aligned with the same view, not to resist a deliberately malicious in-process actor.
Index ¶
Constants ¶
This section is empty.
Variables ¶
var ErrDenied = errors.New("sandbox: path denied")
ErrDenied is returned when a path is denied by the sandbox view (in-process enforcement). Callers may errors.Is(err, ErrDenied).
Functions ¶
This section is empty.
Types ¶
type Service ¶
type Service interface {
// Enabled reports whether sandboxing is active. When false, WrapArgv
// returns inner unchanged and CheckRead/CheckWrite allow everything
// (confinement falls back to the tool layer).
Enabled() bool
// WrapArgv wraps a subprocess command (e.g. ["bash","-lc",cmd] or an ACP
// agent command) with the sandbox view for the current tenant. workDir is
// the subprocess working directory (host absolute path).
WrapArgv(ctx context.Context, workDir string, inner []string) ([]string, error)
// CheckRead allows/denies in-process reads of a host absolute path. The
// model mirrors the subprocess view's allowlist: only the tenant root,
// global root and ro/rwBinds are visible; masked paths (hidePaths,
// secretFiles) and everything else on the host are denied.
CheckRead(ctx context.Context, path string) error
// CheckWrite allows/denies in-process writes of a host absolute path:
// only the tenant root and rwBinds are writable; everything else is denied
// (the in-process equivalent of the sandbox's read-only floor, EROFS).
CheckWrite(ctx context.Context, path string) error
}
Service is the tenant sandbox view. Implementations must be safe for concurrent use and must resolve tenant identity from ctx on every call.
func Disabled ¶ added in v0.3.48
func Disabled() Service
Disabled returns a no-op Service: Enabled reports false, WrapArgv passes inner through unchanged, CheckRead/CheckWrite allow everything (confinement falls back to the tool layer). Assembly code can inject it when no sandbox instance is configured, so consumers never nil-check.
Source Files