forked from canonical/snapd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
spec.go
633 lines (579 loc) · 23.4 KB
/
spec.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017-2018 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
import (
"bytes"
"fmt"
"path/filepath"
"sort"
"strings"
"github.com/snapcore/snapd/interfaces"
"github.com/snapcore/snapd/snap"
"github.com/snapcore/snapd/strutil"
)
// Specification assists in collecting apparmor entries associated with an interface.
type Specification struct {
// scope for various Add{...}Snippet functions
securityTags []string
// snippets are indexed by security tag and describe parts of apparmor policy
// for snap application and hook processes. The security tag encodes the identity
// of the application or hook.
snippets map[string][]string
// dedupSnippets are just like snippets but are added only once to the
// resulting policy in an effort to avoid certain expensive to de-duplicate
// rules by apparmor_parser.
dedupSnippets map[string]*strutil.OrderedSet
// parametricSnippets are like snippets but are further parametrized where
// one template is instantiated with multiple values that end up producing
// a single apparmor rule that is computationally cheaper than naive
// repetition of the template alone. The first map index is the security
// tag, the second map index is the template. The final map value is the
// set of strings that the template is instantiated with across all the
// interfaces.
//
// As a simple example, it can be used to craft rules like
// "/sys/**/foo{1,2,3}/** r,", which do not triggering the exponential
// cost of parsing "/sys/**/foo1/** r,", followed by two similar rules for
// "2" and "3".
parametricSnippets map[string]map[string]*strutil.OrderedSet
// updateNS describe parts of apparmor policy for snap-update-ns executing
// on behalf of a given snap.
updateNS strutil.OrderedSet
// AppArmor deny rules cannot be undone by allow rules which makes
// deny rules difficult to work with arbitrary combinations of
// interfaces. Sometimes it is useful to suppress noisy denials and
// because that can currently only be done with explicit deny rules,
// adding explicit deny rules unconditionally makes it difficult for
// interfaces to be used in combination. Define the suppressPtraceTrace
// to allow an interface to request suppression and define
// usesPtraceTrace to omit the explicit deny rules such that:
// if suppressPtraceTrace && !usesPtraceTrace {
// add 'deny ptrace (trace),'
// }
suppressPtraceTrace bool
usesPtraceTrace bool
// The home interface typically should have 'ix' as part of its rules,
// but specifying certain change_profile rules with these rules cases
// a 'conflicting x modifiers' parser error. Allow interfaces that
// require this type of change_profile rule to suppress 'ix' so that
// the calling interface can be used with the home interface. Ideally,
// we would not need this, but we currently do (LP: #1797786)
suppressHomeIx bool
}
// setScope sets the scope of subsequent AddSnippet family functions.
// The returned function resets the scope to an empty scope.
func (spec *Specification) setScope(securityTags []string) (restore func()) {
spec.securityTags = securityTags
return func() {
spec.securityTags = nil
}
}
// AddSnippet adds a new apparmor snippet to all applications and hooks using the interface.
func (spec *Specification) AddSnippet(snippet string) {
if len(spec.securityTags) == 0 {
return
}
if spec.snippets == nil {
spec.snippets = make(map[string][]string)
}
for _, tag := range spec.securityTags {
spec.snippets[tag] = append(spec.snippets[tag], snippet)
sort.Strings(spec.snippets[tag])
}
}
// AddDeduplicatedSnippet adds a new apparmor snippet to all applications and hooks using the interface.
//
// Certain combinations of snippets may be computationally expensive for
// apparmor_parser in its de-duplication step. This function lets snapd
// perform de-duplication of identical rules at the potential cost of a
// somewhat more complex auditing process of the text of generated
// apparmor profile. Identical mount rules should typically use this, but
// this function can also be used to avoid repeated rules that inhibit
// auditability.
func (spec *Specification) AddDeduplicatedSnippet(snippet string) {
if len(spec.securityTags) == 0 {
return
}
if spec.dedupSnippets == nil {
spec.dedupSnippets = make(map[string]*strutil.OrderedSet)
}
for _, tag := range spec.securityTags {
bag := spec.dedupSnippets[tag]
if bag == nil {
bag = &strutil.OrderedSet{}
spec.dedupSnippets[tag] = bag
}
bag.Put(snippet)
}
}
// AddParametricSnippet adds a new apparmor snippet both de-duplicated and optimized for the parser.
//
// Conceptually the function takes a parametric template and a single value to
// remember. The resulting snippet text is a single entry resulting from the
// expanding the template and all the unique values observed, in the order they
// were observed.
//
// The template is expressed as a slice of strings, with the parameter
// automatically injected between any two of them, or in the special case of
// only one fragment, after that fragment.
//
// The resulting expansion depends on the number of values seen. If only one
// value is seen the resulting snippet is just the plain string one would
// expect if no parametric optimization had taken place. If more than one
// distinct value was seen then the resulting apparmor rule uses alternation
// syntax {param1,param2,...,paramN} which has better compilation time and
// memory complexity as compared to a set of naive expansions of the full
// snippet one after another.
//
// For example the code:
//
// AddParametricSnippet([]string{"/dev/", "rw,"}, "sda1")
// AddParametricSnippet([]string{"/dev/", "rw,"}, "sda3")
// AddParametricSnippet([]string{"/dev/", "rw,"}, "sdb2")
//
// Results in a single apparmor rule:
//
// "/dev/{sda1,sda3,sdb2} rw,"
//
// This function should be used whenever the apparmor template features more
// than one use of "**" syntax (which represent arbitrary many directories or
// files) and a variable component, like a device name or similar. Repeated
// instances of this pattern require exponential memory when compiled with
// apparmor_parser -O no-expr-simplify.
func (spec *Specification) AddParametricSnippet(templateFragment []string, value string) {
if len(spec.securityTags) == 0 {
return
}
// We need to build a template string from the templateFragment.
//
// If only a single fragment is given we just append our "###PARM###":
// []string{"prefix"} becomes -> "prefix###PARAM###"
//
// Otherwise we join the strings:
// []string{"pre","post"} becomes -> "pre###PARAM###post"
//
// This seems to be the most natural way of doing this.
var template string
switch len(templateFragment) {
case 0:
return
case 1:
template = templateFragment[0] + "###PARAM###"
default:
template = strings.Join(templateFragment, "###PARAM###")
}
// Expand the spec's parametric snippets, initializing each
// part of the map as needed
if spec.parametricSnippets == nil {
spec.parametricSnippets = make(map[string]map[string]*strutil.OrderedSet)
}
for _, tag := range spec.securityTags {
expansions := spec.parametricSnippets[tag]
if expansions == nil {
expansions = make(map[string]*strutil.OrderedSet)
spec.parametricSnippets[tag] = expansions
}
values := expansions[template]
if values == nil {
values = &strutil.OrderedSet{}
expansions[template] = values
}
// Now that everything is initialized, insert value into the
// spec.parametricSnippets[<tag>][<template>]'s OrderedSet.
values.Put(value)
}
}
// AddUpdateNS adds a new apparmor snippet for the snap-update-ns program.
func (spec *Specification) AddUpdateNS(snippet string) {
spec.updateNS.Put(snippet)
}
// AddUpdateNSf formats and adds a new apparmor snippet for the snap-update-ns program.
func (spec *Specification) AddUpdateNSf(f string, args ...interface{}) {
spec.AddUpdateNS(fmt.Sprintf(f, args...))
}
// UpdateNSIndexOf returns the index of a previously added snippet.
func (spec *Specification) UpdateNSIndexOf(snippet string) (idx int, ok bool) {
return spec.updateNS.IndexOf(snippet)
}
// AddLayout adds apparmor snippets based on the layout of the snap.
//
// The per-snap snap-update-ns profiles are composed via a template and
// snippets for the snap. The snippets may allow (depending on the snippet):
// - mount profiles via the content interface
// - creating missing mount point directories under $SNAP* (the 'tree'
// of permissions is needed for SecureMkDirAll that uses
// open(..., O_NOFOLLOW) and mkdirat() using the resulting file descriptor)
// - creating a placeholder directory in /tmp/.snap/ in the per-snap mount
// namespace to support writable mimic which uses tmpfs and bind mount to
// poke holes in arbitrary read-only locations
// - mounting/unmounting any part of $SNAP into placeholder directory
// - mounting/unmounting tmpfs over the original $SNAP/** location
// - mounting/unmounting from placeholder back to $SNAP/** (for reconstructing
// the data)
// Importantly, the above mount operations are happening within the per-snap
// mount namespace.
func (spec *Specification) AddLayout(si *snap.Info) {
if len(si.Layout) == 0 {
return
}
// Walk the layout elements in deterministic order, by mount point name.
paths := make([]string, 0, len(si.Layout))
for path := range si.Layout {
paths = append(paths, path)
}
sort.Strings(paths)
// Get tags describing all apps and hooks.
tags := make([]string, 0, len(si.Apps)+len(si.Hooks))
for _, app := range si.Apps {
tags = append(tags, app.SecurityTag())
}
for _, hook := range si.Hooks {
tags = append(tags, hook.SecurityTag())
}
// Append layout snippets to all tags; the layout applies equally to the
// entire snap as the entire snap uses one mount namespace.
if spec.snippets == nil {
spec.snippets = make(map[string][]string)
}
for _, tag := range tags {
for _, path := range paths {
snippet := snippetFromLayout(si.Layout[path])
spec.snippets[tag] = append(spec.snippets[tag], snippet)
}
sort.Strings(spec.snippets[tag])
}
emit := spec.AddUpdateNSf
// Append update-ns snippets that allow constructing the layout.
for _, path := range paths {
l := si.Layout[path]
emit(" # Layout %s\n", l.String())
path := si.ExpandSnapVariables(l.Path)
switch {
case l.Bind != "":
bind := si.ExpandSnapVariables(l.Bind)
// Allow bind mounting the layout element.
emit(" mount options=(rbind, rw) %s/ -> %s/,\n", bind, path)
emit(" mount options=(rprivate) -> %s/,\n", path)
emit(" umount %s/,\n", path)
// Allow constructing writable mimic in both bind-mount source and mount point.
GenWritableProfile(emit, path, 2) // At least / and /some-top-level-directory
GenWritableProfile(emit, bind, 4) // At least /, /snap/, /snap/$SNAP_NAME and /snap/$SNAP_NAME/$SNAP_REVISION
case l.BindFile != "":
bindFile := si.ExpandSnapVariables(l.BindFile)
// Allow bind mounting the layout element.
emit(" mount options=(bind, rw) %s -> %s,\n", bindFile, path)
emit(" mount options=(rprivate) -> %s,\n", path)
emit(" umount %s,\n", path)
// Allow constructing writable mimic in both bind-mount source and mount point.
GenWritableFileProfile(emit, path, 2) // At least / and /some-top-level-directory
GenWritableFileProfile(emit, bindFile, 4) // At least /, /snap/, /snap/$SNAP_NAME and /snap/$SNAP_NAME/$SNAP_REVISION
case l.Type == "tmpfs":
emit(" mount fstype=tmpfs tmpfs -> %s/,\n", path)
emit(" mount options=(rprivate) -> %s/,\n", path)
emit(" umount %s/,\n", path)
// Allow constructing writable mimic to mount point.
GenWritableProfile(emit, path, 2) // At least / and /some-top-level-directory
case l.Symlink != "":
// Allow constructing writable mimic to symlink parent directory.
emit(" %s rw,\n", path)
GenWritableProfile(emit, path, 2) // At least / and /some-top-level-directory
}
}
}
// AddOvername adds AppArmor snippets allowing remapping of snap
// directories for parallel installed snaps
//
// Specifically snap-update-ns will apply the following bind mounts
// - /snap/foo_bar -> /snap/foo
// - /var/snap/foo_bar -> /var/snap/foo
// - /home/joe/snap/foo_bar -> /home/joe/snap/foo
func (spec *Specification) AddOvername(si *snap.Info) {
if si.InstanceKey == "" {
return
}
var buf bytes.Buffer
// /snap/foo_bar -> /snap/foo
fmt.Fprintf(&buf, " # Allow parallel instance snap mount namespace adjustments\n")
fmt.Fprintf(&buf, " mount options=(rw rbind) /snap/%s/ -> /snap/%s/,\n", si.InstanceName(), si.SnapName())
// /var/snap/foo_bar -> /var/snap/foo
fmt.Fprintf(&buf, " mount options=(rw rbind) /var/snap/%s/ -> /var/snap/%s/,\n", si.InstanceName(), si.SnapName())
spec.AddUpdateNS(buf.String())
}
// isProbably writable returns true if the path is probably representing writable area.
func isProbablyWritable(path string) bool {
return strings.HasPrefix(path, "/var/snap/") || strings.HasPrefix(path, "/home/") || strings.HasPrefix(path, "/root/")
}
// isProbablyPresent returns true if the path is probably already present.
//
// This is used as a simple hint to not inject writable path rules for things
// that we don't expect to create as they are already present in the skeleton
// file-system tree.
func isProbablyPresent(path string) bool {
return path == "/" || path == "/snap" || path == "/var" || path == "/var/snap" || path == "/tmp" || path == "/usr" || path == "/etc"
}
// GenWritableMimicProfile generates apparmor rules for a writable mimic at the given path.
func GenWritableMimicProfile(emit func(f string, args ...interface{}), path string, assumedPrefixDepth int) {
emit(" # Writable mimic %s\n", path)
iter, err := strutil.NewPathIterator(path)
if err != nil {
panic(err)
}
// Handle the prefix that is assumed to exist first.
emit(" # .. permissions for traversing the prefix that is assumed to exist\n")
for iter.Next() {
if iter.Depth() < assumedPrefixDepth {
emit(" %s r,\n", iter.CurrentPath())
}
}
// Rewind the iterator and handle the part that needs to be created.
iter.Rewind()
for iter.Next() {
if iter.Depth() < assumedPrefixDepth {
continue
}
// Assume that the mimic needs to be created at the given prefix of the
// full mimic path. This is called a mimic "variant". Both of the paths
// must end with a slash as this is important for apparmor file vs
// directory path semantics.
mimicPath := filepath.Join(iter.CurrentBase(), iter.CurrentCleanName()) + "/"
mimicAuxPath := filepath.Join("/tmp/.snap", iter.CurrentPath()) + "/"
emit(" # .. variant with mimic at %s\n", mimicPath)
emit(" # Allow reading the mimic directory, it must exist in the first place.\n")
emit(" %s r,\n", mimicPath)
emit(" # Allow setting the read-only directory aside via a bind mount.\n")
emit(" %s rw,\n", mimicAuxPath)
emit(" mount options=(rbind, rw) %s -> %s,\n", mimicPath, mimicAuxPath)
emit(" # Allow mounting tmpfs over the read-only directory.\n")
emit(" mount fstype=tmpfs options=(rw) tmpfs -> %s,\n", mimicPath)
emit(" # Allow creating empty files and directories for bind mounting things\n" +
" # to reconstruct the now-writable parent directory.\n")
emit(" %s*/ rw,\n", mimicAuxPath)
emit(" %s*/ rw,\n", mimicPath)
emit(" mount options=(rbind, rw) %s*/ -> %s*/,\n", mimicAuxPath, mimicPath)
emit(" %s* rw,\n", mimicAuxPath)
emit(" %s* rw,\n", mimicPath)
emit(" mount options=(bind, rw) %s* -> %s*,\n", mimicAuxPath, mimicPath)
emit(" # Allow unmounting the auxiliary directory.\n" +
" # TODO: use fstype=tmpfs here for more strictness (LP: #1613403)\n")
emit(" mount options=(rprivate) -> %s,\n", mimicAuxPath)
emit(" umount %s,\n", mimicAuxPath)
emit(" # Allow unmounting the destination directory as well as anything\n" +
" # inside. This lets us perform the undo plan in case the writable\n" +
" # mimic fails.\n")
emit(" mount options=(rprivate) -> %s,\n", mimicPath)
emit(" mount options=(rprivate) -> %s*,\n", mimicPath)
emit(" mount options=(rprivate) -> %s*/,\n", mimicPath)
emit(" umount %s,\n", mimicPath)
emit(" umount %s*,\n", mimicPath)
emit(" umount %s*/,\n", mimicPath)
}
}
// GenWritableFileProfile writes a profile for snap-update-ns for making given file writable.
func GenWritableFileProfile(emit func(f string, args ...interface{}), path string, assumedPrefixDepth int) {
if path == "/" {
return
}
if isProbablyWritable(path) {
emit(" # Writable file %s\n", path)
emit(" %s rw,\n", path)
for p := parent(path); !isProbablyPresent(p); p = parent(p) {
emit(" %s/ rw,\n", p)
}
} else {
parentPath := parent(path)
GenWritableMimicProfile(emit, parentPath, assumedPrefixDepth)
}
}
// GenWritableProfile generates a profile for snap-update-ns for making given directory writable.
func GenWritableProfile(emit func(f string, args ...interface{}), path string, assumedPrefixDepth int) {
if path == "/" {
return
}
if isProbablyWritable(path) {
emit(" # Writable directory %s\n", path)
for p := path; !isProbablyPresent(p); p = parent(p) {
emit(" %s/ rw,\n", p)
}
} else {
parentPath := parent(path)
GenWritableMimicProfile(emit, parentPath, assumedPrefixDepth)
}
}
// parent returns the parent directory of a given path.
func parent(path string) string {
result, _ := filepath.Split(path)
result = filepath.Clean(result)
return result
}
// Snippets returns a deep copy of all the added application snippets.
func (spec *Specification) Snippets() map[string][]string {
tags := spec.SecurityTags()
snippets := make(map[string][]string, len(tags))
for _, tag := range tags {
snippets[tag] = spec.snippetsForTag(tag)
}
return snippets
}
// SnippetForTag returns a combined snippet for given security tag with
// individual snippets joined with the newline character. Empty string is
// returned for non-existing security tag.
func (spec *Specification) SnippetForTag(tag string) string {
return strings.Join(spec.snippetsForTag(tag), "\n")
}
// SecurityTags returns a list of security tags which have a snippet.
func (spec *Specification) SecurityTags() []string {
var tags []string
seen := make(map[string]bool, len(spec.snippets))
for t := range spec.snippets {
tags = append(tags, t)
seen[t] = true
}
for t := range spec.dedupSnippets {
if !seen[t] {
tags = append(tags, t)
}
}
for t := range spec.parametricSnippets {
if !seen[t] {
tags = append(tags, t)
}
}
sort.Strings(tags)
return tags
}
func (spec *Specification) snippetsForTag(tag string) []string {
snippets := append([]string(nil), spec.snippets[tag]...)
// First add any deduplicated snippets
if bag := spec.dedupSnippets[tag]; bag != nil {
snippets = append(snippets, bag.Items()...)
}
templates := make([]string, 0, len(spec.parametricSnippets[tag]))
// Then add any parametric snippets
for template := range spec.parametricSnippets[tag] {
templates = append(templates, template)
}
sort.Strings(templates)
for _, template := range templates {
bag := spec.parametricSnippets[tag][template]
if bag != nil {
values := bag.Items()
switch len(values) {
case 0:
/* no values, nothing to do */
case 1:
snippet := strings.Replace(template, "###PARAM###", values[0], -1)
snippets = append(snippets, snippet)
default:
snippet := strings.Replace(template, "###PARAM###",
fmt.Sprintf("{%s}", strings.Join(values, ",")), -1)
snippets = append(snippets, snippet)
}
}
}
return snippets
}
// UpdateNS returns a deep copy of all the added snap-update-ns snippets.
func (spec *Specification) UpdateNS() []string {
return spec.updateNS.Items()
}
func snippetFromLayout(layout *snap.Layout) string {
mountPoint := layout.Snap.ExpandSnapVariables(layout.Path)
if layout.Bind != "" || layout.Type == "tmpfs" {
return fmt.Sprintf("# Layout path: %s\n%s{,/**} mrwklix,", mountPoint, mountPoint)
} else if layout.BindFile != "" {
return fmt.Sprintf("# Layout path: %s\n%s mrwklix,", mountPoint, mountPoint)
}
return fmt.Sprintf("# Layout path: %s\n# (no extra permissions required for symlink)", mountPoint)
}
// Implementation of methods required by interfaces.Specification
// AddConnectedPlug records apparmor-specific side-effects of having a connected plug.
func (spec *Specification) AddConnectedPlug(iface interfaces.Interface, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
type definer interface {
AppArmorConnectedPlug(spec *Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error
}
if iface, ok := iface.(definer); ok {
restore := spec.setScope(plug.SecurityTags())
defer restore()
return iface.AppArmorConnectedPlug(spec, plug, slot)
}
return nil
}
// AddConnectedSlot records apparmor-specific side-effects of having a connected slot.
func (spec *Specification) AddConnectedSlot(iface interfaces.Interface, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
type definer interface {
AppArmorConnectedSlot(spec *Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error
}
if iface, ok := iface.(definer); ok {
restore := spec.setScope(slot.SecurityTags())
defer restore()
return iface.AppArmorConnectedSlot(spec, plug, slot)
}
return nil
}
// AddPermanentPlug records apparmor-specific side-effects of having a plug.
func (spec *Specification) AddPermanentPlug(iface interfaces.Interface, plug *snap.PlugInfo) error {
type definer interface {
AppArmorPermanentPlug(spec *Specification, plug *snap.PlugInfo) error
}
if iface, ok := iface.(definer); ok {
restore := spec.setScope(plug.SecurityTags())
defer restore()
return iface.AppArmorPermanentPlug(spec, plug)
}
return nil
}
// AddPermanentSlot records apparmor-specific side-effects of having a slot.
func (spec *Specification) AddPermanentSlot(iface interfaces.Interface, slot *snap.SlotInfo) error {
type definer interface {
AppArmorPermanentSlot(spec *Specification, slot *snap.SlotInfo) error
}
if iface, ok := iface.(definer); ok {
restore := spec.setScope(slot.SecurityTags())
defer restore()
return iface.AppArmorPermanentSlot(spec, slot)
}
return nil
}
// SetUsesPtraceTrace records when to omit explicit ptrace deny rules.
func (spec *Specification) SetUsesPtraceTrace() {
spec.usesPtraceTrace = true
}
// UsesPtraceTrace returns whether ptrace is being used by any of the interfaces
// in the spec.
func (spec *Specification) UsesPtraceTrace() bool {
return spec.usesPtraceTrace
}
// SetSuppressPtraceTrace to request explicit ptrace deny rules
func (spec *Specification) SetSuppressPtraceTrace() {
spec.suppressPtraceTrace = true
}
// SuppressPtraceTrace returns whether ptrace should be suppressed as dictated
// by any of the interfaces in the spec.
func (spec *Specification) SuppressPtraceTrace() bool {
return spec.suppressPtraceTrace
}
// SetSuppressHomeIx records suppression of the ix rules for the home
// interface.
func (spec *Specification) SetSuppressHomeIx() {
spec.suppressHomeIx = true
}
// SuppressHomeIx returns whether the ix rules of the home interface should be
// suppressed.
func (spec *Specification) SuppressHomeIx() bool {
return spec.suppressHomeIx
}