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
|
// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"fmt"
specs "github.com/opencontainers/runtime-spec/specs-go"
"github.com/syndtr/gocapability/capability"
"gvisor.googlesource.com/gvisor/pkg/log"
)
var allCapTypes = []capability.CapType{
capability.BOUNDS,
capability.EFFECTIVE,
capability.PERMITTED,
capability.INHERITABLE,
capability.AMBIENT,
}
// applyCaps applies the capabilities in the spec to the current thread.
//
// Note that it must be called with current thread locked.
func applyCaps(caps *specs.LinuxCapabilities) error {
// Load current capabilities to trim the ones not permitted.
curCaps, err := capability.NewPid2(0)
if err != nil {
return err
}
if err := curCaps.Load(); err != nil {
return err
}
// Create an empty capability set to populate.
newCaps, err := capability.NewPid2(0)
if err != nil {
return err
}
for _, c := range allCapTypes {
if !newCaps.Empty(c) {
panic("unloaded capabilities must be empty")
}
set, err := trimCaps(getCaps(c, caps), curCaps)
if err != nil {
return err
}
newCaps.Set(c, set...)
}
if err := newCaps.Apply(capability.CAPS | capability.BOUNDS | capability.AMBS); err != nil {
return err
}
log.Infof("Capabilities applied: %+v", newCaps)
return nil
}
func getCaps(which capability.CapType, caps *specs.LinuxCapabilities) []string {
switch which {
case capability.BOUNDS:
return caps.Bounding
case capability.EFFECTIVE:
return caps.Effective
case capability.PERMITTED:
return caps.Permitted
case capability.INHERITABLE:
return caps.Inheritable
case capability.AMBIENT:
return caps.Ambient
}
panic(fmt.Sprint("invalid capability type:", which))
}
func trimCaps(names []string, setter capability.Capabilities) ([]capability.Cap, error) {
wantedCaps, err := capsFromNames(names)
if err != nil {
return nil, err
}
// Trim down capabilities that aren't possible to acquire.
var caps []capability.Cap
for _, c := range wantedCaps {
// Capability rules are more complicated than this, but this catches most
// problems with tests running with non-privileged user.
if setter.Get(capability.PERMITTED, c) {
caps = append(caps, c)
} else {
log.Warningf("Capability %q is not permitted, dropping it.", c)
}
}
return caps, nil
}
func capsFromNames(names []string) ([]capability.Cap, error) {
var caps []capability.Cap
for _, name := range names {
cap, ok := capFromName[name]
if !ok {
return nil, fmt.Errorf("invalid capability %q", name)
}
caps = append(caps, cap)
}
return caps, nil
}
var capFromName = map[string]capability.Cap{
"CAP_CHOWN": capability.CAP_CHOWN,
"CAP_DAC_OVERRIDE": capability.CAP_DAC_OVERRIDE,
"CAP_DAC_READ_SEARCH": capability.CAP_DAC_READ_SEARCH,
"CAP_FOWNER": capability.CAP_FOWNER,
"CAP_FSETID": capability.CAP_FSETID,
"CAP_KILL": capability.CAP_KILL,
"CAP_SETGID": capability.CAP_SETGID,
"CAP_SETUID": capability.CAP_SETUID,
"CAP_SETPCAP": capability.CAP_SETPCAP,
"CAP_LINUX_IMMUTABLE": capability.CAP_LINUX_IMMUTABLE,
"CAP_NET_BIND_SERVICE": capability.CAP_NET_BIND_SERVICE,
"CAP_NET_BROADCAST": capability.CAP_NET_BROADCAST,
"CAP_NET_ADMIN": capability.CAP_NET_ADMIN,
"CAP_NET_RAW": capability.CAP_NET_RAW,
"CAP_IPC_LOCK": capability.CAP_IPC_LOCK,
"CAP_IPC_OWNER": capability.CAP_IPC_OWNER,
"CAP_SYS_MODULE": capability.CAP_SYS_MODULE,
"CAP_SYS_RAWIO": capability.CAP_SYS_RAWIO,
"CAP_SYS_CHROOT": capability.CAP_SYS_CHROOT,
"CAP_SYS_PTRACE": capability.CAP_SYS_PTRACE,
"CAP_SYS_PACCT": capability.CAP_SYS_PACCT,
"CAP_SYS_ADMIN": capability.CAP_SYS_ADMIN,
"CAP_SYS_BOOT": capability.CAP_SYS_BOOT,
"CAP_SYS_NICE": capability.CAP_SYS_NICE,
"CAP_SYS_RESOURCE": capability.CAP_SYS_RESOURCE,
"CAP_SYS_TIME": capability.CAP_SYS_TIME,
"CAP_SYS_TTY_CONFIG": capability.CAP_SYS_TTY_CONFIG,
"CAP_MKNOD": capability.CAP_MKNOD,
"CAP_LEASE": capability.CAP_LEASE,
"CAP_AUDIT_WRITE": capability.CAP_AUDIT_WRITE,
"CAP_AUDIT_CONTROL": capability.CAP_AUDIT_CONTROL,
"CAP_SETFCAP": capability.CAP_SETFCAP,
"CAP_MAC_OVERRIDE": capability.CAP_MAC_OVERRIDE,
"CAP_MAC_ADMIN": capability.CAP_MAC_ADMIN,
"CAP_SYSLOG": capability.CAP_SYSLOG,
"CAP_WAKE_ALARM": capability.CAP_WAKE_ALARM,
"CAP_BLOCK_SUSPEND": capability.CAP_BLOCK_SUSPEND,
"CAP_AUDIT_READ": capability.CAP_AUDIT_READ,
}
|
