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
|
package apparmor
import (
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
"slices"
"strings"
deviceConfig "github.com/lxc/incus/v6/internal/server/device/config"
"github.com/lxc/incus/v6/internal/server/project"
"github.com/lxc/incus/v6/internal/server/sys"
localUtil "github.com/lxc/incus/v6/internal/server/util"
internalUtil "github.com/lxc/incus/v6/internal/util"
"github.com/lxc/incus/v6/shared/util"
)
// Internal copy of the device interface.
type device interface {
Config() deviceConfig.Device
Name() string
}
// forkproxyProfile generates the AppArmor profile template from the given network.
func forkproxyProfile(sysOS *sys.OS, inst instance, dev device) (string, error) {
// Add any socket used by forkproxy.
sockets := []string{}
fields := strings.SplitN(dev.Config()["listen"], ":", 2)
if fields[0] == "unix" && !strings.HasPrefix(fields[1], "@") {
sockets = append(sockets, fields[1])
}
fields = strings.SplitN(dev.Config()["connect"], ":", 2)
if fields[0] == "unix" && !strings.HasPrefix(fields[1], "@") {
sockets = append(sockets, fields[1])
}
// AppArmor requires deref of all paths.
for k := range sockets {
// Skip non-existing because of the additional entry for the host side.
if !util.PathExists(sockets[k]) {
continue
}
v, err := filepath.EvalSymlinks(sockets[k])
if err != nil {
return "", err
}
if !slices.Contains(sockets, v) {
sockets = append(sockets, v)
}
}
execPath := localUtil.GetExecPath()
execPathFull, err := filepath.EvalSymlinks(execPath)
if err == nil {
execPath = execPathFull
}
// Render the profile.
var sb *strings.Builder = &strings.Builder{}
err = forkproxyProfileTpl.Execute(sb, map[string]any{
"name": ForkproxyProfileName(inst, dev),
"varPath": internalUtil.VarPath(""),
"exePath": execPath,
"logPath": inst.LogPath(),
"libraryPath": strings.Split(os.Getenv("LD_LIBRARY_PATH"), ":"),
"sockets": sockets,
})
if err != nil {
return "", err
}
return sb.String(), nil
}
// ForkproxyProfileName returns the AppArmor profile name.
func ForkproxyProfileName(inst instance, dev device) string {
path := internalUtil.VarPath("")
name := fmt.Sprintf("%s_%s_<%s>", dev.Name(), project.Instance(inst.Project().Name, inst.Name()), path)
return profileName("forkproxy", name)
}
// forkproxyProfileFilename returns the name of the on-disk profile name.
func forkproxyProfileFilename(inst instance, dev device) string {
name := fmt.Sprintf("%s_%s", dev.Name(), project.Instance(inst.Project().Name, inst.Name()))
return profileName("forkproxy", name)
}
// ForkproxyLoad ensures that the instances's policy is loaded into the kernel so the it can boot.
func ForkproxyLoad(sysOS *sys.OS, inst instance, dev device) error {
/* In order to avoid forcing a profile parse (potentially slow) on
* every container start, let's use AppArmor's binary policy cache,
* which checks mtime of the files to figure out if the policy needs to
* be regenerated.
*
* Since it uses mtimes, we shouldn't just always write out our local
* AppArmor template; instead we should check to see whether the
* template is the same as ours. If it isn't we should write our
* version out so that the new changes are reflected and we definitely
* force a recompile.
*/
profile := filepath.Join(aaPath, "profiles", forkproxyProfileFilename(inst, dev))
content, err := os.ReadFile(profile)
if err != nil && !errors.Is(err, fs.ErrNotExist) {
return err
}
updated, err := forkproxyProfile(sysOS, inst, dev)
if err != nil {
return err
}
if string(content) != string(updated) {
err = os.WriteFile(profile, []byte(updated), 0o600)
if err != nil {
return err
}
}
err = loadProfile(sysOS, forkproxyProfileFilename(inst, dev))
if err != nil {
return err
}
return nil
}
// ForkproxyUnload ensures that the instances's policy namespace is unloaded to free kernel memory.
// This does not delete the policy from disk or cache.
func ForkproxyUnload(sysOS *sys.OS, inst instance, dev device) error {
return unloadProfile(sysOS, ForkproxyProfileName(inst, dev), forkproxyProfileFilename(inst, dev))
}
// ForkproxyDelete removes the policy from cache/disk.
func ForkproxyDelete(sysOS *sys.OS, inst instance, dev device) error {
return deleteProfile(sysOS, ForkproxyProfileName(inst, dev), forkproxyProfileFilename(inst, dev))
}
|
