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Merge pull request #41471 from thaJeztah/seccomp_rewrite

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seccomp: refactor to use runtime-spec types where possible
This commit is contained in:
Sebastiaan van Stijn 2020-09-25 10:56:44 +02:00 committed by GitHub
commit 2b7824b3a5
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 163 additions and 242 deletions
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94
api/types/seccomp.go
View file

@ -1,94 +0,0 @@
package types // import "github.com/docker/docker/api/types"
// Seccomp represents the config for a seccomp profile for syscall restriction.
type Seccomp struct {
DefaultAction Action `json:"defaultAction"`
// Architectures is kept to maintain backward compatibility with the old
// seccomp profile.
Architectures []Arch `json:"architectures,omitempty"`
ArchMap []Architecture `json:"archMap,omitempty"`
Syscalls []*Syscall `json:"syscalls"`
}
// Architecture is used to represent a specific architecture
// and its sub-architectures
type Architecture struct {
Arch Arch `json:"architecture"`
SubArches []Arch `json:"subArchitectures"`
}
// Arch used for architectures
type Arch string
// Additional architectures permitted to be used for system calls
// By default only the native architecture of the kernel is permitted
const (
ArchX86 Arch = "SCMP_ARCH_X86"
ArchX86_64 Arch = "SCMP_ARCH_X86_64"
ArchX32 Arch = "SCMP_ARCH_X32"
ArchARM Arch = "SCMP_ARCH_ARM"
ArchAARCH64 Arch = "SCMP_ARCH_AARCH64"
ArchMIPS Arch = "SCMP_ARCH_MIPS"
ArchMIPS64 Arch = "SCMP_ARCH_MIPS64"
ArchMIPS64N32 Arch = "SCMP_ARCH_MIPS64N32"
ArchMIPSEL Arch = "SCMP_ARCH_MIPSEL"
ArchMIPSEL64 Arch = "SCMP_ARCH_MIPSEL64"
ArchMIPSEL64N32 Arch = "SCMP_ARCH_MIPSEL64N32"
ArchPPC Arch = "SCMP_ARCH_PPC"
ArchPPC64 Arch = "SCMP_ARCH_PPC64"
ArchPPC64LE Arch = "SCMP_ARCH_PPC64LE"
ArchS390 Arch = "SCMP_ARCH_S390"
ArchS390X Arch = "SCMP_ARCH_S390X"
)
// Action taken upon Seccomp rule match
type Action string
// Define actions for Seccomp rules
const (
ActKill Action = "SCMP_ACT_KILL"
ActTrap Action = "SCMP_ACT_TRAP"
ActErrno Action = "SCMP_ACT_ERRNO"
ActTrace Action = "SCMP_ACT_TRACE"
ActAllow Action = "SCMP_ACT_ALLOW"
)
// Operator used to match syscall arguments in Seccomp
type Operator string
// Define operators for syscall arguments in Seccomp
const (
OpNotEqual Operator = "SCMP_CMP_NE"
OpLessThan Operator = "SCMP_CMP_LT"
OpLessEqual Operator = "SCMP_CMP_LE"
OpEqualTo Operator = "SCMP_CMP_EQ"
OpGreaterEqual Operator = "SCMP_CMP_GE"
OpGreaterThan Operator = "SCMP_CMP_GT"
OpMaskedEqual Operator = "SCMP_CMP_MASKED_EQ"
)
// Arg used for matching specific syscall arguments in Seccomp
type Arg struct {
Index uint `json:"index"`
Value uint64 `json:"value"`
ValueTwo uint64 `json:"valueTwo"`
Op Operator `json:"op"`
}
// Filter is used to conditionally apply Seccomp rules
type Filter struct {
Caps []string `json:"caps,omitempty"`
Arches []string `json:"arches,omitempty"`
MinKernel string `json:"minKernel,omitempty"`
}
// Syscall is used to match a group of syscalls in Seccomp
type Syscall struct {
Name string `json:"name,omitempty"`
Names []string `json:"names,omitempty"`
Action Action `json:"action"`
Args []*Arg `json:"args"`
Comment string `json:"comment"`
Includes Filter `json:"includes"`
Excludes Filter `json:"excludes"`
}

7
profiles/seccomp/default.json
View file

@ -416,7 +416,6 @@
{
"index": 0,
"value": 0,
"valueTwo": 0,
"op": "SCMP_CMP_EQ"
}
],
@ -433,7 +432,6 @@
{
"index": 0,
"value": 8,
"valueTwo": 0,
"op": "SCMP_CMP_EQ"
}
],
@ -450,7 +448,6 @@
{
"index": 0,
"value": 131072,
"valueTwo": 0,
"op": "SCMP_CMP_EQ"
}
],
@ -467,7 +464,6 @@
{
"index": 0,
"value": 131080,
"valueTwo": 0,
"op": "SCMP_CMP_EQ"
}
],
@ -484,7 +480,6 @@
{
"index": 0,
"value": 4294967295,
"valueTwo": 0,
"op": "SCMP_CMP_EQ"
}
],
@ -625,7 +620,6 @@
{
"index": 0,
"value": 2114060288,
"valueTwo": 0,
"op": "SCMP_CMP_MASKED_EQ"
}
],
@ -650,7 +644,6 @@
{
"index": 1,
"value": 2114060288,
"valueTwo": 0,
"op": "SCMP_CMP_MASKED_EQ"
}
],

200
profiles/seccomp/default_linux.go
View file

@ -3,46 +3,46 @@
package seccomp // import "github.com/docker/docker/profiles/seccomp"
import (
"github.com/docker/docker/api/types"
"github.com/opencontainers/runtime-spec/specs-go"
"golang.org/x/sys/unix"
)
func arches() []types.Architecture {
return []types.Architecture{
func arches() []Architecture {
return []Architecture{
{
Arch: types.ArchX86_64,
SubArches: []types.Arch{types.ArchX86, types.ArchX32},
Arch: specs.ArchX86_64,
SubArches: []specs.Arch{specs.ArchX86, specs.ArchX32},
},
{
Arch: types.ArchAARCH64,
SubArches: []types.Arch{types.ArchARM},
Arch: specs.ArchAARCH64,
SubArches: []specs.Arch{specs.ArchARM},
},
{
Arch: types.ArchMIPS64,
SubArches: []types.Arch{types.ArchMIPS, types.ArchMIPS64N32},
Arch: specs.ArchMIPS64,
SubArches: []specs.Arch{specs.ArchMIPS, specs.ArchMIPS64N32},
},
{
Arch: types.ArchMIPS64N32,
SubArches: []types.Arch{types.ArchMIPS, types.ArchMIPS64},
Arch: specs.ArchMIPS64N32,
SubArches: []specs.Arch{specs.ArchMIPS, specs.ArchMIPS64},
},
{
Arch: types.ArchMIPSEL64,
SubArches: []types.Arch{types.ArchMIPSEL, types.ArchMIPSEL64N32},
Arch: specs.ArchMIPSEL64,
SubArches: []specs.Arch{specs.ArchMIPSEL, specs.ArchMIPSEL64N32},
},
{
Arch: types.ArchMIPSEL64N32,
SubArches: []types.Arch{types.ArchMIPSEL, types.ArchMIPSEL64},
Arch: specs.ArchMIPSEL64N32,
SubArches: []specs.Arch{specs.ArchMIPSEL, specs.ArchMIPSEL64},
},
{
Arch: types.ArchS390X,
SubArches: []types.Arch{types.ArchS390},
Arch: specs.ArchS390X,
SubArches: []specs.Arch{specs.ArchS390},
},
}
}
// DefaultProfile defines the allowed syscalls for the default seccomp profile.
func DefaultProfile() *types.Seccomp {
syscalls := []*types.Syscall{
func DefaultProfile() *Seccomp {
syscalls := []*Syscall{
{
Names: []string{
"accept",
@ -382,68 +382,68 @@ func DefaultProfile() *types.Seccomp {
"write",
"writev",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
},
{
Names: []string{"ptrace"},
Action: types.ActAllow,
Includes: types.Filter{
Action: specs.ActAllow,
Includes: Filter{
MinKernel: "4.8",
},
},
{
Names: []string{"personality"},
Action: types.ActAllow,
Args: []*types.Arg{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{
{
Index: 0,
Value: 0x0,
Op: types.OpEqualTo,
Op: specs.OpEqualTo,
},
},
},
{
Names: []string{"personality"},
Action: types.ActAllow,
Args: []*types.Arg{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{
{
Index: 0,
Value: 0x0008,
Op: types.OpEqualTo,
Op: specs.OpEqualTo,
},
},
},
{
Names: []string{"personality"},
Action: types.ActAllow,
Args: []*types.Arg{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{
{
Index: 0,
Value: 0x20000,
Op: types.OpEqualTo,
Op: specs.OpEqualTo,
},
},
},
{
Names: []string{"personality"},
Action: types.ActAllow,
Args: []*types.Arg{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{
{
Index: 0,
Value: 0x20008,
Op: types.OpEqualTo,
Op: specs.OpEqualTo,
},
},
},
{
Names: []string{"personality"},
Action: types.ActAllow,
Args: []*types.Arg{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{
{
Index: 0,
Value: 0xffffffff,
Op: types.OpEqualTo,
Op: specs.OpEqualTo,
},
},
},
@ -451,9 +451,9 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"sync_file_range2",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Arches: []string{"ppc64le"},
},
},
@ -466,9 +466,9 @@ func DefaultProfile() *types.Seccomp {
"cacheflush",
"set_tls",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Arches: []string{"arm", "arm64"},
},
},
@ -476,9 +476,9 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"arch_prctl",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Arches: []string{"amd64", "x32"},
},
},
@ -486,9 +486,9 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"modify_ldt",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Arches: []string{"amd64", "x32", "x86"},
},
},
@ -498,9 +498,9 @@ func DefaultProfile() *types.Seccomp {
"s390_pci_mmio_write",
"s390_runtime_instr",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Arches: []string{"s390", "s390x"},
},
},
@ -508,9 +508,9 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"open_by_handle_at",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_DAC_READ_SEARCH"},
},
},
@ -532,9 +532,9 @@ func DefaultProfile() *types.Seccomp {
"umount2",
"unshare",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_ADMIN"},
},
},
@ -542,16 +542,16 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"clone",
},
Action: types.ActAllow,
Args: []*types.Arg{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{
{
Index: 0,
Value: unix.CLONE_NEWNS | unix.CLONE_NEWUTS | unix.CLONE_NEWIPC | unix.CLONE_NEWUSER | unix.CLONE_NEWPID | unix.CLONE_NEWNET | unix.CLONE_NEWCGROUP,
ValueTwo: 0,
Op: types.OpMaskedEqual,
Op: specs.OpMaskedEqual,
},
},
Excludes: types.Filter{
Excludes: Filter{
Caps: []string{"CAP_SYS_ADMIN"},
Arches: []string{"s390", "s390x"},
},
@ -560,20 +560,20 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"clone",
},
Action: types.ActAllow,
Args: []*types.Arg{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{
{
Index: 1,
Value: unix.CLONE_NEWNS | unix.CLONE_NEWUTS | unix.CLONE_NEWIPC | unix.CLONE_NEWUSER | unix.CLONE_NEWPID | unix.CLONE_NEWNET | unix.CLONE_NEWCGROUP,
ValueTwo: 0,
Op: types.OpMaskedEqual,
Op: specs.OpMaskedEqual,
},
},
Comment: "s390 parameter ordering for clone is different",
Includes: types.Filter{
Includes: Filter{
Arches: []string{"s390", "s390x"},
},
Excludes: types.Filter{
Excludes: Filter{
Caps: []string{"CAP_SYS_ADMIN"},
},
},
@ -581,9 +581,9 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"reboot",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_BOOT"},
},
},
@ -591,9 +591,9 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"chroot",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_CHROOT"},
},
},
@ -603,9 +603,9 @@ func DefaultProfile() *types.Seccomp {
"init_module",
"finit_module",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_MODULE"},
},
},
@ -613,9 +613,9 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"acct",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_PACCT"},
},
},
@ -626,9 +626,9 @@ func DefaultProfile() *types.Seccomp {
"process_vm_writev",
"ptrace",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_PTRACE"},
},
},
@ -637,9 +637,9 @@ func DefaultProfile() *types.Seccomp {
"iopl",
"ioperm",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_RAWIO"},
},
},
@ -649,9 +649,9 @@ func DefaultProfile() *types.Seccomp {
"stime",
"clock_settime",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_TIME"},
},
},
@ -659,9 +659,9 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"vhangup",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_TTY_CONFIG"},
},
},
@ -671,9 +671,9 @@ func DefaultProfile() *types.Seccomp {
"mbind",
"set_mempolicy",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYS_NICE"},
},
},
@ -681,16 +681,16 @@ func DefaultProfile() *types.Seccomp {
Names: []string{
"syslog",
},
Action: types.ActAllow,
Args: []*types.Arg{},
Includes: types.Filter{
Action: specs.ActAllow,
Args: []*specs.LinuxSeccompArg{},
Includes: Filter{
Caps: []string{"CAP_SYSLOG"},
},
},
}
return &types.Seccomp{
DefaultAction: types.ActErrno,
return &Seccomp{
DefaultAction: specs.ActErrno,
ArchMap: arches(),
Syscalls: syscalls,
}

38
profiles/seccomp/seccomp.go Normal file
View file

@ -0,0 +1,38 @@
package seccomp // import "github.com/docker/docker/profiles/seccomp"
import "github.com/opencontainers/runtime-spec/specs-go"
// Seccomp represents the config for a seccomp profile for syscall restriction.
type Seccomp struct {
DefaultAction specs.LinuxSeccompAction `json:"defaultAction"`
// Architectures is kept to maintain backward compatibility with the old
// seccomp profile.
Architectures []specs.Arch `json:"architectures,omitempty"`
ArchMap []Architecture `json:"archMap,omitempty"`
Syscalls []*Syscall `json:"syscalls"`
}
// Architecture is used to represent a specific architecture
// and its sub-architectures
type Architecture struct {
Arch specs.Arch `json:"architecture"`
SubArches []specs.Arch `json:"subArchitectures"`
}
// Filter is used to conditionally apply Seccomp rules
type Filter struct {
Caps []string `json:"caps,omitempty"`
Arches []string `json:"arches,omitempty"`
MinKernel string `json:"minKernel,omitempty"`
}
// Syscall is used to match a group of syscalls in Seccomp
type Syscall struct {
Name string `json:"name,omitempty"`
Names []string `json:"names,omitempty"`
Action specs.LinuxSeccompAction `json:"action"`
Args []*specs.LinuxSeccompArg `json:"args"`
Comment string `json:"comment"`
Includes Filter `json:"includes"`
Excludes Filter `json:"excludes"`
}

60
profiles/seccomp/seccomp_linux.go
View file

@ -8,7 +8,6 @@ import (
"fmt"
"runtime"
"github.com/docker/docker/api/types"
"github.com/docker/docker/pkg/parsers/kernel"
specs "github.com/opencontainers/runtime-spec/specs-go"
)
@ -20,7 +19,7 @@ func GetDefaultProfile(rs *specs.Spec) (*specs.LinuxSeccomp, error) {
// LoadProfile takes a json string and decodes the seccomp profile.
func LoadProfile(body string, rs *specs.Spec) (*specs.LinuxSeccomp, error) {
var config types.Seccomp
var config Seccomp
if err := json.Unmarshal([]byte(body), &config); err != nil {
return nil, fmt.Errorf("Decoding seccomp profile failed: %v", err)
}
@ -28,21 +27,21 @@ func LoadProfile(body string, rs *specs.Spec) (*specs.LinuxSeccomp, error) {
}
// libseccomp string => seccomp arch
var nativeToSeccomp = map[string]types.Arch{
"x86": types.ArchX86,
"amd64": types.ArchX86_64,
"arm": types.ArchARM,
"arm64": types.ArchAARCH64,
"mips64": types.ArchMIPS64,
"mips64n32": types.ArchMIPS64N32,
"mipsel64": types.ArchMIPSEL64,
"mips3l64n32": types.ArchMIPSEL64N32,
"mipsle": types.ArchMIPSEL,
"ppc": types.ArchPPC,
"ppc64": types.ArchPPC64,
"ppc64le": types.ArchPPC64LE,
"s390": types.ArchS390,
"s390x": types.ArchS390X,
var nativeToSeccomp = map[string]specs.Arch{
"x86": specs.ArchX86,
"amd64": specs.ArchX86_64,
"arm": specs.ArchARM,
"arm64": specs.ArchAARCH64,
"mips64": specs.ArchMIPS64,
"mips64n32": specs.ArchMIPS64N32,
"mipsel64": specs.ArchMIPSEL64,
"mips3l64n32": specs.ArchMIPSEL64N32,
"mipsle": specs.ArchMIPSEL,
"ppc": specs.ArchPPC,
"ppc64": specs.ArchPPC64,
"ppc64le": specs.ArchPPC64LE,
"s390": specs.ArchS390,
"s390x": specs.ArchS390X,
}
// GOARCH => libseccomp string
@ -74,7 +73,7 @@ func inSlice(slice []string, s string) bool {
return false
}
func setupSeccomp(config *types.Seccomp, rs *specs.Spec) (*specs.LinuxSeccomp, error) {
func setupSeccomp(config *Seccomp, rs *specs.Spec) (*specs.LinuxSeccomp, error) {
if config == nil {
return nil, nil
}
@ -92,9 +91,7 @@ func setupSeccomp(config *types.Seccomp, rs *specs.Spec) (*specs.LinuxSeccomp, e
// if config.Architectures == 0 then libseccomp will figure out the architecture to use
if len(config.Architectures) != 0 {
for _, a := range config.Architectures {
newConfig.Architectures = append(newConfig.Architectures, specs.Arch(a))
}
newConfig.Architectures = config.Architectures
}
arch := goToNative[runtime.GOARCH]
@ -103,16 +100,14 @@ func setupSeccomp(config *types.Seccomp, rs *specs.Spec) (*specs.LinuxSeccomp, e
if len(config.ArchMap) != 0 && archExists {
for _, a := range config.ArchMap {
if a.Arch == seccompArch {
newConfig.Architectures = append(newConfig.Architectures, specs.Arch(a.Arch))
for _, sa := range a.SubArches {
newConfig.Architectures = append(newConfig.Architectures, specs.Arch(sa))
}
newConfig.Architectures = append(newConfig.Architectures, a.Arch)
newConfig.Architectures = append(newConfig.Architectures, a.SubArches...)
break
}
}
}
newConfig.DefaultAction = specs.LinuxSeccompAction(config.DefaultAction)
newConfig.DefaultAction = config.DefaultAction
Loop:
// Loop through all syscall blocks and convert them to libcontainer format after filtering them
@ -170,22 +165,15 @@ Loop:
return newConfig, nil
}
func createSpecsSyscall(names []string, action types.Action, args []*types.Arg) specs.LinuxSyscall {
func createSpecsSyscall(names []string, action specs.LinuxSeccompAction, args []*specs.LinuxSeccompArg) specs.LinuxSyscall {
newCall := specs.LinuxSyscall{
Names: names,
Action: specs.LinuxSeccompAction(action),
Action: action,
}
// Loop through all the arguments of the syscall and convert them
for _, arg := range args {
newArg := specs.LinuxSeccompArg{
Index: arg.Index,
Value: arg.Value,
ValueTwo: arg.ValueTwo,
Op: specs.LinuxSeccompOperator(arg.Op),
}
newCall.Args = append(newCall.Args, newArg)
newCall.Args = append(newCall.Args, *arg)
}
return newCall
}

6
profiles/seccomp/seccomp_unsupported.go
View file

@ -2,11 +2,7 @@
package seccomp // import "github.com/docker/docker/profiles/seccomp"
import (
"github.com/docker/docker/api/types"
)
// DefaultProfile returns a nil pointer on unsupported systems.
func DefaultProfile() *types.Seccomp {
func DefaultProfile() *Seccomp {
return nil
}