mirror of https://github.com/k3s-io/k3s
141 lines
4.1 KiB
Go
141 lines
4.1 KiB
Go
package seccomp
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
"strconv"
|
|
"strings"
|
|
|
|
rspec "github.com/opencontainers/runtime-spec/specs-go"
|
|
)
|
|
|
|
// Determine if a new syscall rule should be appended, overwrite an existing rule
|
|
// or if no action should be taken at all
|
|
func decideCourseOfAction(newSyscall *rspec.LinuxSyscall, syscalls []rspec.LinuxSyscall) (string, error) {
|
|
ruleForSyscallAlreadyExists := false
|
|
|
|
var sliceOfDeterminedActions []string
|
|
for i, syscall := range syscalls {
|
|
if sameName(&syscall, newSyscall) {
|
|
ruleForSyscallAlreadyExists = true
|
|
|
|
if identical(newSyscall, &syscall) {
|
|
sliceOfDeterminedActions = append(sliceOfDeterminedActions, nothing)
|
|
}
|
|
|
|
if sameAction(newSyscall, &syscall) {
|
|
if bothHaveArgs(newSyscall, &syscall) {
|
|
sliceOfDeterminedActions = append(sliceOfDeterminedActions, seccompAppend)
|
|
}
|
|
if onlyOneHasArgs(newSyscall, &syscall) {
|
|
if firstParamOnlyHasArgs(newSyscall, &syscall) {
|
|
sliceOfDeterminedActions = append(sliceOfDeterminedActions, "overwrite:"+strconv.Itoa(i))
|
|
} else {
|
|
sliceOfDeterminedActions = append(sliceOfDeterminedActions, nothing)
|
|
}
|
|
}
|
|
}
|
|
|
|
if !sameAction(newSyscall, &syscall) {
|
|
if bothHaveArgs(newSyscall, &syscall) {
|
|
if sameArgs(newSyscall, &syscall) {
|
|
sliceOfDeterminedActions = append(sliceOfDeterminedActions, "overwrite:"+strconv.Itoa(i))
|
|
}
|
|
if !sameArgs(newSyscall, &syscall) {
|
|
sliceOfDeterminedActions = append(sliceOfDeterminedActions, seccompAppend)
|
|
}
|
|
}
|
|
if onlyOneHasArgs(newSyscall, &syscall) {
|
|
sliceOfDeterminedActions = append(sliceOfDeterminedActions, seccompAppend)
|
|
}
|
|
if neitherHasArgs(newSyscall, &syscall) {
|
|
sliceOfDeterminedActions = append(sliceOfDeterminedActions, "overwrite:"+strconv.Itoa(i))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if !ruleForSyscallAlreadyExists {
|
|
sliceOfDeterminedActions = append(sliceOfDeterminedActions, seccompAppend)
|
|
}
|
|
|
|
// Nothing has highest priority
|
|
for _, determinedAction := range sliceOfDeterminedActions {
|
|
if determinedAction == nothing {
|
|
return determinedAction, nil
|
|
}
|
|
}
|
|
|
|
// Overwrite has second highest priority
|
|
for _, determinedAction := range sliceOfDeterminedActions {
|
|
if strings.Contains(determinedAction, seccompOverwrite) {
|
|
return determinedAction, nil
|
|
}
|
|
}
|
|
|
|
// Append has the lowest priority
|
|
for _, determinedAction := range sliceOfDeterminedActions {
|
|
if determinedAction == seccompAppend {
|
|
return determinedAction, nil
|
|
}
|
|
}
|
|
|
|
return "", fmt.Errorf("Trouble determining action: %s", sliceOfDeterminedActions)
|
|
}
|
|
|
|
func hasArguments(config *rspec.LinuxSyscall) bool {
|
|
nilSyscall := new(rspec.LinuxSyscall)
|
|
return !sameArgs(nilSyscall, config)
|
|
}
|
|
|
|
func identical(config1, config2 *rspec.LinuxSyscall) bool {
|
|
return reflect.DeepEqual(config1, config2)
|
|
}
|
|
|
|
func identicalExceptAction(config1, config2 *rspec.LinuxSyscall) bool {
|
|
samename := sameName(config1, config2)
|
|
sameAction := sameAction(config1, config2)
|
|
sameArgs := sameArgs(config1, config2)
|
|
|
|
return samename && !sameAction && sameArgs
|
|
}
|
|
|
|
func identicalExceptArgs(config1, config2 *rspec.LinuxSyscall) bool {
|
|
samename := sameName(config1, config2)
|
|
sameAction := sameAction(config1, config2)
|
|
sameArgs := sameArgs(config1, config2)
|
|
|
|
return samename && sameAction && !sameArgs
|
|
}
|
|
|
|
func sameName(config1, config2 *rspec.LinuxSyscall) bool {
|
|
return reflect.DeepEqual(config1.Names, config2.Names)
|
|
}
|
|
|
|
func sameAction(config1, config2 *rspec.LinuxSyscall) bool {
|
|
return config1.Action == config2.Action
|
|
}
|
|
|
|
func sameArgs(config1, config2 *rspec.LinuxSyscall) bool {
|
|
return reflect.DeepEqual(config1.Args, config2.Args)
|
|
}
|
|
|
|
func bothHaveArgs(config1, config2 *rspec.LinuxSyscall) bool {
|
|
return hasArguments(config1) && hasArguments(config2)
|
|
}
|
|
|
|
func onlyOneHasArgs(config1, config2 *rspec.LinuxSyscall) bool {
|
|
conf1 := hasArguments(config1)
|
|
conf2 := hasArguments(config2)
|
|
|
|
return (conf1 && !conf2) || (!conf1 && conf2)
|
|
}
|
|
|
|
func neitherHasArgs(config1, config2 *rspec.LinuxSyscall) bool {
|
|
return !hasArguments(config1) && !hasArguments(config2)
|
|
}
|
|
|
|
func firstParamOnlyHasArgs(config1, config2 *rspec.LinuxSyscall) bool {
|
|
return !hasArguments(config1) && hasArguments(config2)
|
|
}
|