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When using the Client FS APIs, we check to ensure that reads don't traverse into the allocation's secret dir and private dir. But this check can be bypassed on case-insensitive file systems (ex. Windows, macOS, and Linux with obscure ext4 options enabled). This allows a user with `read-fs` permissions but not `alloc-exec` permissions to read from the secrets dir. This changeset updates the check so that it's case-insensitive. This risks false positives for escape (see linked Go issue), but only if a task without filesystem isolation deliberately writes into the task working directory to do so, which is a fail-safe failure mode. Ref: https://github.com/golang/go/issues/18358 Co-authored-by: dduzgun-security <deniz.duzgun@hashicorp.com>
61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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//go:build !linux
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// +build !linux
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package allocdir
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import (
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"os"
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"path/filepath"
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"testing"
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"github.com/hashicorp/nomad/ci"
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"github.com/hashicorp/nomad/helper/testlog"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/hashicorp/nomad/plugins/drivers/fsisolation"
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"github.com/shoenig/test/must"
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)
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func TestAllocDir_ReadAt_CaseInsensitiveSecretDir(t *testing.T) {
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ci.Parallel(t)
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// On macOS, os.TempDir returns a symlinked path under /var which
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// is outside of the directories shared into the VM used for Docker.
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// Expand the symlink to get the real path in /private, which is ok.
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tmp, err := filepath.EvalSymlinks(t.TempDir())
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must.NoError(t, err)
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d := NewAllocDir(testlog.HCLogger(t), tmp, tmp, "test")
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must.NoError(t, d.Build())
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defer func() { _ = d.Destroy() }()
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td := d.NewTaskDir(t1Windows)
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must.NoError(t, td.Build(fsisolation.None, nil, "nobody"))
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target := filepath.Join(t1Windows.Name, TaskSecrets, "test_file")
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full := filepath.Join(d.AllocDir, target)
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must.NoError(t, os.WriteFile(full, []byte("hi"), 0o600))
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targetCaseInsensitive := filepath.Join(t1Windows.Name, "sEcReTs", "test_file")
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_, err = d.ReadAt(targetCaseInsensitive, 0)
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must.EqError(t, err, "Reading secret file prohibited: "+targetCaseInsensitive)
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}
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var (
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t1Windows = &structs.Task{
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Name: "web",
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Driver: "exec",
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Config: map[string]interface{}{
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"command": "/bin/date",
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"args": "+%s",
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},
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Resources: &structs.Resources{
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DiskMB: 1,
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},
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}
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)
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