121 lines
4.1 KiB
Go
121 lines
4.1 KiB
Go
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// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package boot
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import (
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"fmt"
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"os"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/syndtr/gocapability/capability"
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)
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// ApplyCaps applies the capabilities in the spec to the current thread.
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//
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// Note that it must be called with current thread locked.
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func ApplyCaps(conf *Config, caps *specs.LinuxCapabilities) error {
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setter, err := capability.NewPid2(os.Getpid())
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if err != nil {
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return err
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}
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bounding, err := capsFromNames(caps.Bounding)
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if err != nil {
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return err
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}
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effective, err := capsFromNames(caps.Effective)
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if err != nil {
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return err
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}
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permitted, err := capsFromNames(caps.Permitted)
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if err != nil {
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return err
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}
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inheritable, err := capsFromNames(caps.Inheritable)
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if err != nil {
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return err
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}
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ambient, err := capsFromNames(caps.Ambient)
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if err != nil {
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return err
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}
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// Ptrace platform requires extra capabilities.
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if conf.Platform == PlatformPtrace {
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bounding = append(bounding, capability.CAP_SYS_PTRACE)
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effective = append(effective, capability.CAP_SYS_PTRACE)
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permitted = append(permitted, capability.CAP_SYS_PTRACE)
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}
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setter.Set(capability.BOUNDS, bounding...)
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setter.Set(capability.PERMITTED, permitted...)
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setter.Set(capability.INHERITABLE, inheritable...)
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setter.Set(capability.EFFECTIVE, effective...)
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setter.Set(capability.AMBIENT, ambient...)
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return setter.Apply(capability.CAPS | capability.BOUNDS | capability.AMBS)
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}
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func capsFromNames(names []string) ([]capability.Cap, error) {
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var caps []capability.Cap
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for _, name := range names {
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cap, ok := capFromName[name]
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if !ok {
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return nil, fmt.Errorf("invalid capability %q", name)
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}
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caps = append(caps, cap)
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}
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return caps, nil
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}
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var capFromName = map[string]capability.Cap{
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"CAP_CHOWN": capability.CAP_CHOWN,
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"CAP_DAC_OVERRIDE": capability.CAP_DAC_OVERRIDE,
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"CAP_DAC_READ_SEARCH": capability.CAP_DAC_READ_SEARCH,
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"CAP_FOWNER": capability.CAP_FOWNER,
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"CAP_FSETID": capability.CAP_FSETID,
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"CAP_KILL": capability.CAP_KILL,
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"CAP_SETGID": capability.CAP_SETGID,
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"CAP_SETUID": capability.CAP_SETUID,
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"CAP_SETPCAP": capability.CAP_SETPCAP,
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"CAP_LINUX_IMMUTABLE": capability.CAP_LINUX_IMMUTABLE,
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"CAP_NET_BIND_SERVICE": capability.CAP_NET_BIND_SERVICE,
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"CAP_NET_BROAD_CAST": capability.CAP_NET_BROADCAST,
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"CAP_NET_ADMIN": capability.CAP_NET_ADMIN,
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"CAP_NET_RAW": capability.CAP_NET_RAW,
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"CAP_IPC_LOCK": capability.CAP_IPC_LOCK,
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"CAP_IPC_OWNER": capability.CAP_IPC_OWNER,
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"CAP_SYS_MODULE": capability.CAP_SYS_MODULE,
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"CAP_SYS_RAWIO": capability.CAP_SYS_RAWIO,
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"CAP_SYS_CHROOT": capability.CAP_SYS_CHROOT,
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"CAP_SYS_PTRACE": capability.CAP_SYS_PTRACE,
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"CAP_SYS_PACCT": capability.CAP_SYS_PACCT,
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"CAP_SYS_ADMIN": capability.CAP_SYS_ADMIN,
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"CAP_SYS_BOOT": capability.CAP_SYS_BOOT,
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"CAP_SYS_NICE": capability.CAP_SYS_NICE,
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"CAP_SYS_RESOURCE": capability.CAP_SYS_RESOURCE,
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"CAP_SYS_TIME": capability.CAP_SYS_TIME,
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"CAP_SYS_TTY_CONFIG": capability.CAP_SYS_TTY_CONFIG,
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"CAP_MKNOD": capability.CAP_MKNOD,
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"CAP_LEASE": capability.CAP_LEASE,
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"CAP_AUDIT_WRITE": capability.CAP_AUDIT_WRITE,
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"CAP_AUDIT_CONTROL": capability.CAP_AUDIT_CONTROL,
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"CAP_SETFCAP": capability.CAP_SETFCAP,
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"CAP_MAC_OVERRIDE": capability.CAP_MAC_OVERRIDE,
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"CAP_MAC_ADMIN": capability.CAP_MAC_ADMIN,
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"CAP_SYSLOG": capability.CAP_SYSLOG,
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"CAP_WAKE_ALARM": capability.CAP_WAKE_ALARM,
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"CAP_BLOCK_SUSPEND": capability.CAP_BLOCK_SUSPEND,
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}
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