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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package apparmor_test
import (
"os"
"path/filepath"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/sandbox/apparmor"
"github.com/snapcore/snapd/snap"
)
func (s *apparmorSuite) TestDecodeLabel(c *C) {
label := snap.AppSecurityTag("snap_name", "my-app")
snapName, appName, hookName, err := apparmor.DecodeLabel(label)
c.Assert(err, IsNil)
c.Check(snapName, Equals, "snap_name")
c.Check(appName, Equals, "my-app")
c.Check(hookName, Equals, "")
label = snap.HookSecurityTag("snap_name", "my-hook")
snapName, appName, hookName, err = apparmor.DecodeLabel(label)
c.Assert(err, IsNil)
c.Check(snapName, Equals, "snap_name")
c.Check(appName, Equals, "")
c.Check(hookName, Equals, "my-hook")
_, _, _, err = apparmor.DecodeLabel("unconfined")
c.Assert(err, ErrorMatches, `security label "unconfined" does not belong to a snap`)
_, _, _, err = apparmor.DecodeLabel("/usr/bin/ntpd")
c.Assert(err, ErrorMatches, `security label "/usr/bin/ntpd" does not belong to a snap`)
}
func (s *apparmorSuite) TestDecodeLabelUnrecognisedSnapLabel(c *C) {
_, _, _, err := apparmor.DecodeLabel("snap.weird")
c.Assert(err, ErrorMatches, `unknown snap related security label "snap.weird"`)
}
func (s *apparmorSuite) TestSnapAppFromPidNewKernelPath(c *C) {
d := c.MkDir()
restore := apparmor.MockFsRootPath(d)
defer restore()
// when the new file exists we use that one
newProcFile := filepath.Join(d, "proc/42/attr/apparmor/current")
c.Assert(os.MkdirAll(filepath.Dir(newProcFile), 0755), IsNil)
c.Assert(os.WriteFile(newProcFile, []byte("snap.foo.app"), 0644), IsNil)
oldProcFile := filepath.Join(d, "proc/42/attr/current")
c.Assert(os.MkdirAll(filepath.Dir(oldProcFile), 0755), IsNil)
c.Assert(os.WriteFile(oldProcFile, []byte("random-other-unread-data"), 0644), IsNil)
name, app, hook, err := apparmor.SnapAppFromPid(42)
c.Assert(err, IsNil)
c.Assert(name, Equals, "foo")
c.Assert(app, Equals, "app")
c.Assert(hook, Equals, "")
}
func (s *apparmorSuite) TestSnapAppFromPid(c *C) {
d := c.MkDir()
restore := apparmor.MockFsRootPath(d)
defer restore()
// When no /proc/$pid/attr/current exists, assume unconfined
_, _, _, err := apparmor.SnapAppFromPid(42)
c.Check(err, ErrorMatches, `security label "unconfined" does not belong to a snap`)
procFile := filepath.Join(d, "proc/42/attr/current")
c.Assert(os.MkdirAll(filepath.Dir(procFile), 0755), IsNil)
c.Assert(os.WriteFile(procFile, []byte("not-read"), 0000), IsNil)
_, _, _, err = apparmor.SnapAppFromPid(42)
c.Check(err, ErrorMatches, `open .*/proc/42/attr/current: permission denied`)
c.Assert(os.Remove(procFile), IsNil)
for _, t := range []struct {
contents string
name, app, hook string
err string
}{{
contents: "unconfined\n",
err: `security label "unconfined" does not belong to a snap`,
}, {
contents: "/usr/sbin/cupsd (enforce)\n",
err: `security label "/usr/sbin/cupsd" does not belong to a snap`,
}, {
contents: "snap.foo.app (complain)\n",
name: "foo",
app: "app",
}, {
contents: "snap.foo.hook.snap-hook (complain)\n",
name: "foo",
hook: "snap-hook",
}, {
contents: "snap.foo.app.garbage\n",
err: `unknown snap related security label "snap.foo.app.garbage"`,
}, {
contents: "snap.foo.hook.app.garbage\n",
err: `unknown snap related security label "snap.foo.hook.app.garbage"`,
}} {
c.Assert(os.WriteFile(procFile, []byte(t.contents), 0644), IsNil)
name, app, hook, err := apparmor.SnapAppFromPid(42)
if t.err != "" {
c.Check(err, ErrorMatches, t.err)
} else {
c.Check(err, IsNil)
c.Check(name, Equals, t.name)
c.Check(app, Equals, t.app)
c.Check(hook, Equals, t.hook)
}
}
}
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