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deserializers.go
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deserializers.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-present Datadog, Inc.
//go:build linux
package serializers
import (
json "encoding/json"
"fmt"
"os"
"github.com/DataDog/datadog-agent/pkg/security/secl/model"
)
func getPointerValue[T uint32 | uint64 | bool](p *T) T {
if p != nil {
return *p
}
var def T
return def
}
func newFileEvent(fs *FileSerializer) model.FileEvent {
file := model.FileEvent{
PathnameStr: fs.Path,
BasenameStr: fs.Name,
Filesystem: fs.Filesystem,
FileFields: model.FileFields{
UID: uint32(fs.UID),
User: fs.User,
GID: uint32(fs.GID),
Group: fs.Group,
InUpperLayer: getPointerValue(fs.InUpperLayer),
Mode: uint16(getPointerValue(fs.Mode)),
MTime: uint64(fs.Mtime.GetInnerTime().UnixMicro()),
CTime: uint64(fs.Ctime.GetInnerTime().UnixMicro()),
PathKey: model.PathKey{
Inode: getPointerValue(fs.Inode),
MountID: getPointerValue(fs.MountID),
},
},
PkgName: fs.PackageName,
PkgVersion: fs.PackageVersion,
IsPathnameStrResolved: true,
IsBasenameStrResolved: true,
HashState: model.NoHash,
}
return file
}
func newProcess(ps *ProcessSerializer) model.Process {
p := model.Process{
PPid: getPointerValue(ps.PPid),
Comm: ps.Comm,
TTYName: ps.TTY,
FileEvent: newFileEvent(ps.Executable),
Argv0: ps.Argv0,
Argv: ps.Args,
ArgsTruncated: ps.ArgsTruncated,
Envs: ps.Envs,
EnvsTruncated: ps.EnvsTruncated,
IsThread: ps.IsThread,
IsExecExec: ps.IsExecExec,
PIDContext: model.PIDContext{
Pid: ps.Pid,
Tid: ps.Tid,
IsKworker: ps.IsKworker,
},
}
if ps.ForkTime != nil {
p.ForkTime = ps.ForkTime.GetInnerTime()
}
if ps.ExecTime != nil {
p.ExecTime = ps.ExecTime.GetInnerTime()
}
if ps.ExitTime != nil {
p.ExitTime = ps.ExitTime.GetInnerTime()
}
if ps.Container != nil {
p.ContainerID = ps.Container.ID
}
// TODO: credentials
return p
}
// UnmarshalEvent unmarshal an model.Event (only exec one for now)
func UnmarshalEvent(raw []byte) (*model.Event, error) {
rawEvent := EventSerializer{}
err := json.Unmarshal(raw, &rawEvent)
if err != nil {
return nil, err
}
if rawEvent.EventContextSerializer.Name != "exec" {
return nil, fmt.Errorf("Unmarshalling of event %v is not yet supported", rawEvent.EventContextSerializer.Name)
}
parent := newProcess(rawEvent.ProcessContextSerializer.Parent)
process := newProcess(rawEvent.ProcessContextSerializer.ProcessSerializer)
event := model.Event{
BaseEvent: model.BaseEvent{
Type: uint32(model.ExecEventType),
FieldHandlers: &model.FakeFieldHandlers{},
ContainerContext: &model.ContainerContext{},
ProcessContext: &model.ProcessContext{
Process: process,
Parent: &parent,
Ancestor: nil,
},
},
}
event.BaseEvent.ProcessCacheEntry = &model.ProcessCacheEntry{
ProcessContext: *event.BaseEvent.ProcessContext,
}
// Fill ancestors
prevProcessContext := event.BaseEvent.ProcessContext
prevProcess := &process
for _, ancestor := range rawEvent.ProcessContextSerializer.Ancestors {
currentPocess := newProcess(ancestor)
prevProcessContext.Ancestor = &model.ProcessCacheEntry{
ProcessContext: model.ProcessContext{
Parent: prevProcess,
Process: currentPocess,
},
}
prevProcessContext = &prevProcessContext.Ancestor.ProcessContext
prevProcess = ¤tPocess
}
event.BaseEvent.ProcessCacheEntry = &model.ProcessCacheEntry{
ProcessContext: *event.BaseEvent.ProcessContext,
}
return &event, nil
}
// DecodeEvent will read a JSON file, and unmarshal its content to an model.Event
func DecodeEvent(file string) (*model.Event, error) {
raw, err := os.ReadFile(file)
if err != nil {
return nil, err
}
return UnmarshalEvent(raw)
}