feat(filter): Intersects operator

The intersects operator and its case-insensitive
variant, operate on strings slices. If all elements
in the RHS slice are present in the slice given by
LHS, the operator evaluates to true. Otherwise, it
evaluates to false.

Author: rabbitstack

pkg/filter/filter_test.go

@@ -153,6 +153,7 @@ func TestProcFilter(t *testing.T) {
 			Username: "SYSTEM",
 			Domain:   "NT AUTHORITY",
 			SID:      "S-1-5-18",
+			Args:     []string{"-k", "DcomLaunch", "-p", "-s", "LSM"},
 			Envs:     map[string]string{"ALLUSERSPROFILE": "C:\\ProgramData", "OS": "Windows_NT", "ProgramFiles(x86)": "C:\\Program Files (x86)"},
 			Modules: []pstypes.Module{
 				{Name: "C:\\Windows\\System32\\kernel32.dll", Size: 12354, Checksum: 23123343, BaseAddress: va.Address(4294066175), DefaultBaseAddress: va.Address(4293993725)},
@@ -245,6 +246,11 @@ func TestProcFilter(t *testing.T) {
 		{`ps.ancestor[any].name contains ('Sys')`, true},
 		{`ps.ancestor[any].name icontains ('sys')`, true},
 		{`ps.ancestor[any].pid in (2034, 343)`, true},
+
+		{`ps.args intersects ('-k', 'DcomLaunch')`, true},
+		{`ps.args intersects ('-w', 'DcomLaunch')`, false},
+		{`ps.args iintersects ('-K', 'DComLaunch')`, true},
+		{`ps.args iintersects ('-W', 'DcomLaunch')`, false},
 	}
 
 	psnap := new(ps.SnapshotterMock)

pkg/filter/ql/ast.go

@@ -22,6 +22,7 @@ package ql
 
 import (
 	fuzzysearch "github.com/lithammer/fuzzysearch/fuzzy"
+	"github.com/rabbitstack/fibratus/pkg/util/sets"
 	"github.com/rabbitstack/fibratus/pkg/util/wildcard"
 	"net"
 	"strconv"
@@ -1152,6 +1153,18 @@ func (v *ValuerEval) evalBinaryExpr(expr *BinaryExpr) interface{} {
 				}
 			}
 			return false
+		case Intersects:
+			rhs, ok := rhs.([]string)
+			if !ok {
+				return false
+			}
+			return len(sets.IntersectionStrings(lhs, rhs, false)) == len(rhs)
+		case IIntersects:
+			rhs, ok := rhs.([]string)
+			if !ok {
+				return false
+			}
+			return len(sets.IntersectionStrings(lhs, rhs, true)) == len(rhs)
 		}
 	}
 

pkg/filter/ql/token.go

@@ -63,6 +63,8 @@ const (
 	IFuzzy      // ifuzzy
 	Fuzzynorm   // fuzzynorm
 	IFuzzynorm  // ifuzzynorm
+	Intersects  // intersects
+	IIntersects // iintersects
 	Eq          // =
 	IEq         // ~=
 	Neq         // !=
@@ -91,7 +93,7 @@ func init() {
 	for _, tok := range []token{And, Or, Contains, IContains, In,
 		IIn, Not, Startswith, IStartswith, Endswith, IEndswith,
 		Matches, IMatches, Fuzzy, IFuzzy, Fuzzynorm, IFuzzynorm,
-		Seq, MaxSpan, By, As} {
+		Intersects, IIntersects, Seq, MaxSpan, By, As} {
 		keywords[strings.ToLower(tokens[tok])] = tok
 	}
 	keywords["true"] = True
@@ -134,6 +136,8 @@ var tokens = [...]string{
 	IFuzzy:      "IFUZZY",
 	Fuzzynorm:   "FUZZYNORM",
 	IFuzzynorm:  "IFUZZYNORM",
+	Intersects:  "INTERSECTS",
+	IIntersects: "IINTERSECTS",
 
 	Eq:  "=",
 	IEq: "~=",
@@ -178,7 +182,7 @@ func (tok token) precedence() int {
 	case Eq, IEq, Neq, Lt, Lte, Gt, Gte:
 		return 4
 	case In, IIn, Contains, IContains, Startswith, IStartswith, Endswith, IEndswith,
-		Matches, IMatches, Fuzzy, IFuzzy, Fuzzynorm, IFuzzynorm:
+		Matches, IMatches, Fuzzy, IFuzzy, Fuzzynorm, IFuzzynorm, Intersects, IIntersects:
 		return 5
 	}
 	return 0

pkg/util/sets/intersection.go

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2021-2022 by Nedim Sabic Sabic
+ * https://www.fibratus.io
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sets
+
+import "strings"
+
+// IntersectionStrings computes the intersection of two
+// string slices. The boolean argument specifies if the
+// string comparison is case-sensitive or not.
+func IntersectionStrings(s1, s2 []string, ignoreCase bool) []string {
+	inter := make([]string, 0)
+	bucket := map[string]bool{}
+
+	for _, i := range s1 {
+		for _, j := range s2 {
+			var eq bool
+			if ignoreCase {
+				eq = strings.EqualFold(i, j) && !bucket[i]
+			} else {
+				eq = i == j && !bucket[i]
+			}
+			if eq {
+				inter = append(inter, i)
+				bucket[i] = true
+			}
+		}
+	}
+
+	return inter
+}

pkg/util/sets/intersection_test.go

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2021-2022 by Nedim Sabic Sabic
+ * https://www.fibratus.io
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sets
+
+import (
+	"github.com/stretchr/testify/assert"
+	"strings"
+	"testing"
+)
+
+func TestIntersectionStrings(t *testing.T) {
+	var tests = []struct {
+		s1         []string
+		s2         []string
+		ignoreCase bool
+		in         []string
+	}{
+		{
+			[]string{"-k", "DcomLaunch", "-p", "-s", "LSM"}, []string{"DcomLaunch", "-s"}, true, []string{"DcomLaunch", "-s"},
+		},
+		{
+			[]string{"-k", "DcomLaunch", "-p", "-s", "LSM"}, []string{"DComLaunch", "-s"}, false, []string{"-s"},
+		},
+		{
+			[]string{"-k", "DcomLaunch", "-p", "-s", "LSM"}, []string{"LocalSystemNetworkRestricted"}, true, []string{},
+		},
+		{
+			[]string{"LSM", "-s"}, []string{"-S", "lsm"}, true, []string{"LSM", "-s"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(strings.Join(tt.in, ","), func(t *testing.T) {
+			assert.Equal(t, tt.in, IntersectionStrings(tt.s1, tt.s2, tt.ignoreCase))
+		})
+	}
+}