forked from DataDog/datadog-agent
/
capabilities.go
137 lines (117 loc) · 4.02 KB
/
capabilities.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
// +build linux
package probe
import (
"path"
"strings"
"github.com/StackVista/stackstate-agent/pkg/security/secl/compiler/eval"
"github.com/StackVista/stackstate-agent/pkg/security/secl/rules"
)
// allCapabilities hold all the supported filtering capabilities
var allCapabilities = make(map[eval.EventType]Capabilities)
// Capability represents the type of values we are able to filter kernel side
type Capability struct {
PolicyFlags PolicyFlag
FieldValueTypes eval.FieldValueType
ValidateFnc func(value rules.FilterValue) bool
}
// Capabilities represents the filtering capabilities for a set of fields
type Capabilities map[eval.Field]Capability
// GetFlags returns the policy flags for the set of capabilities
func (caps Capabilities) GetFlags() PolicyFlag {
var flags PolicyFlag
for _, cap := range caps {
flags |= cap.PolicyFlags
}
return flags
}
// GetFields returns the fields associated with a set of capabilities
func (caps Capabilities) GetFields() []eval.Field {
var fields []eval.Field
for field := range caps {
fields = append(fields, field)
}
return fields
}
// GetFieldCapabilities returns the field capabilities for a set of capabilities
func (caps Capabilities) GetFieldCapabilities() rules.FieldCapabilities {
var fcs rules.FieldCapabilities
for field, cap := range caps {
fcs = append(fcs, rules.FieldCapability{
Field: field,
Types: cap.FieldValueTypes,
ValidateFnc: cap.ValidateFnc,
})
}
return fcs
}
func validateBasenameFilter(value rules.FilterValue) bool {
switch value.Type {
case eval.ScalarValueType:
return true
case eval.PatternValueType:
basename := path.Base(value.Value.(string))
if !strings.Contains(basename, "*") {
return true
}
}
return false
}
func oneBasenameCapabilities(event string) Capabilities {
return Capabilities{
event + ".file.path": {
PolicyFlags: PolicyFlagBasename,
FieldValueTypes: eval.ScalarValueType | eval.PatternValueType,
ValidateFnc: validateBasenameFilter,
},
event + ".file.name": {
PolicyFlags: PolicyFlagBasename,
FieldValueTypes: eval.ScalarValueType,
},
}
}
func twoBasenameCapabilities(event string, field1, field2 string) Capabilities {
return Capabilities{
event + "." + field1 + ".path": {
PolicyFlags: PolicyFlagBasename,
FieldValueTypes: eval.ScalarValueType | eval.PatternValueType,
ValidateFnc: validateBasenameFilter,
},
event + "." + field1 + ".name": {
PolicyFlags: PolicyFlagBasename,
FieldValueTypes: eval.ScalarValueType,
},
event + "." + field2 + ".path": {
PolicyFlags: PolicyFlagBasename,
FieldValueTypes: eval.ScalarValueType | eval.PatternValueType,
ValidateFnc: validateBasenameFilter,
},
event + "." + field2 + ".name": {
PolicyFlags: PolicyFlagBasename,
FieldValueTypes: eval.ScalarValueType,
},
}
}
// GetCapababilities returns all the filtering capabilities
func GetCapababilities() map[eval.EventType]rules.FieldCapabilities {
capabilities := make(map[eval.EventType]rules.FieldCapabilities)
for eventType, eventCapabilities := range allCapabilities {
capabilities[eventType] = eventCapabilities.GetFieldCapabilities()
}
return capabilities
}
func init() {
allCapabilities["chmod"] = oneBasenameCapabilities("chmod")
allCapabilities["chown"] = oneBasenameCapabilities("chown")
allCapabilities["link"] = twoBasenameCapabilities("link", "file", "file.destination")
allCapabilities["mkdir"] = oneBasenameCapabilities("mkdir")
allCapabilities["open"] = openCapabilities
allCapabilities["rename"] = twoBasenameCapabilities("rename", "file", "file.destination")
allCapabilities["rmdir"] = oneBasenameCapabilities("rmdir")
allCapabilities["unlink"] = oneBasenameCapabilities("unlink")
allCapabilities["utimes"] = oneBasenameCapabilities("utimes")
}