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Fix REQUEST_URI behavior + fix #2891 (#2917)

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* fix our behavior to comply more with modsec, REQUEST_URI should be: path+query string

* fix #2891 as well

* add new transforms

* add transform tests
This commit is contained in:
Thibault "bui" Koechlin 2024-03-29 17:57:54 +01:00 committed by GitHub
parent be97466809
commit 63bd31b471
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GPG key ID: B5690EEEBB952194
5 changed files with 333 additions and 6 deletions
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74
pkg/acquisition/modules/appsec/appsec_others_test.go Normal file
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@ -0,0 +1,74 @@
//go:build !windows
// +build !windows
package appsecacquisition
import (
"testing"
"github.com/crowdsecurity/crowdsec/pkg/appsec"
"github.com/crowdsecurity/crowdsec/pkg/appsec/appsec_rule"
"github.com/crowdsecurity/crowdsec/pkg/types"
log "github.com/sirupsen/logrus"
"github.com/stretchr/testify/require"
)
func TestAppsecRuleTransformsOthers(t *testing.T) {
log.SetLevel(log.TraceLevel)
tests := []appsecRuleTest{
{
name: "normalizepath",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"ARGS"},
Variables: []string{"foo"},
Match: appsec_rule.Match{Type: "equals", Value: "b/c"},
Transform: []string{"normalizepath"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/?foo=a/../b/c",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
{
name: "normalizepath #2",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"ARGS"},
Variables: []string{"foo"},
Match: appsec_rule.Match{Type: "equals", Value: "b/c/"},
Transform: []string{"normalizepath"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/?foo=a/../b/c/////././././",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
loadAppSecEngine(test, t)
})
}
}

200
pkg/acquisition/modules/appsec/appsec_test.go
View file

@ -1284,6 +1284,206 @@ func TestAppsecRuleMatches(t *testing.T) {
}
}
func TestAppsecRuleTransforms(t *testing.T) {
log.SetLevel(log.TraceLevel)
tests := []appsecRuleTest{
{
name: "Basic matching rule",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"URI"},
Match: appsec_rule.Match{Type: "equals", Value: "/toto"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/toto",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
{
name: "lowercase",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"URI"},
Match: appsec_rule.Match{Type: "equals", Value: "/toto"},
Transform: []string{"lowercase"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/TOTO",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
{
name: "uppercase",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"URI"},
Match: appsec_rule.Match{Type: "equals", Value: "/TOTO"},
Transform: []string{"uppercase"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/toto",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
{
name: "b64decode",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"ARGS"},
Variables: []string{"foo"},
Match: appsec_rule.Match{Type: "equals", Value: "toto"},
Transform: []string{"b64decode"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/?foo=dG90bw",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
{
name: "b64decode with extra padding",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"ARGS"},
Variables: []string{"foo"},
Match: appsec_rule.Match{Type: "equals", Value: "toto"},
Transform: []string{"b64decode"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/?foo=dG90bw===",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
{
name: "length",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"ARGS"},
Variables: []string{"foo"},
Match: appsec_rule.Match{Type: "gte", Value: "3"},
Transform: []string{"length"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/?foo=toto",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
{
name: "urldecode",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"ARGS"},
Variables: []string{"foo"},
Match: appsec_rule.Match{Type: "equals", Value: "BB/A"},
Transform: []string{"urldecode"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/?foo=%42%42%2F%41",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
{
name: "trim",
expected_load_ok: true,
inband_rules: []appsec_rule.CustomRule{
{
Name: "rule1",
Zones: []string{"ARGS"},
Variables: []string{"foo"},
Match: appsec_rule.Match{Type: "equals", Value: "BB/A"},
Transform: []string{"urldecode", "trim"},
},
},
input_request: appsec.ParsedRequest{
RemoteAddr: "1.2.3.4",
Method: "GET",
URI: "/?foo=%20%20%42%42%2F%41%20%20",
},
output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
require.Len(t, events, 2)
require.Equal(t, types.APPSEC, events[0].Type)
require.Equal(t, types.LOG, events[1].Type)
require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
},
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
loadAppSecEngine(test, t)
})
}
}
func loadAppSecEngine(test appsecRuleTest, t *testing.T) {
if testing.Verbose() {
log.SetLevel(log.TraceLevel)

46
pkg/acquisition/modules/appsec/appsec_win_test.go Normal file
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@ -0,0 +1,46 @@
//go:build windows
// +build windows
package appsecacquisition
import (
"testing"
log "github.com/sirupsen/logrus"
)
func TestAppsecRuleTransformsWindows(t *testing.T) {
log.SetLevel(log.TraceLevel)
tests := []appsecRuleTest{
// {
// name: "normalizepath",
// expected_load_ok: true,
// inband_rules: []appsec_rule.CustomRule{
// {
// Name: "rule1",
// Zones: []string{"ARGS"},
// Variables: []string{"foo"},
// Match: appsec_rule.Match{Type: "equals", Value: "b/c"},
// Transform: []string{"normalizepath"},
// },
// },
// input_request: appsec.ParsedRequest{
// RemoteAddr: "1.2.3.4",
// Method: "GET",
// URI: "/?foo=a/../b/c",
// },
// output_asserts: func(events []types.Event, responses []appsec.AppsecTempResponse, appsecResponse appsec.BodyResponse, statusCode int) {
// require.Len(t, events, 2)
// require.Equal(t, types.APPSEC, events[0].Type)
// require.Equal(t, types.LOG, events[1].Type)
// require.Equal(t, "rule1", events[1].Appsec.MatchedRules[0]["msg"])
// },
// },
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
loadAppSecEngine(test, t)
})
}
}

11
pkg/appsec/appsec_rule/modsecurity.go
View file

@ -19,7 +19,8 @@ var zonesMap map[string]string = map[string]string{
"HEADERS": "REQUEST_HEADERS",
"METHOD": "REQUEST_METHOD",
"PROTOCOL": "REQUEST_PROTOCOL",
"URI": "REQUEST_URI",
"URI": "REQUEST_FILENAME",
"URI_FULL": "REQUEST_URI",
"RAW_BODY": "REQUEST_BODY",
"FILENAMES": "FILES",
}
@ -28,8 +29,14 @@ var transformMap map[string]string = map[string]string{
"lowercase": "t:lowercase",
"uppercase": "t:uppercase",
"b64decode": "t:base64Decode",
"hexdecode": "t:hexDecode",
//"hexdecode": "t:hexDecode", -> not supported by coraza
"length": "t:length",
"urldecode": "t:urlDecode",
"trim": "t:trim",
"normalize_path": "t:normalizePath",
"normalizepath": "t:normalizePath",
"htmlentitydecode": "t:htmlEntityDecode",
"html_entity_decode": "t:htmlEntityDecode",
}
var matchMap map[string]string = map[string]string{

6
pkg/appsec/request.go
View file

@ -365,11 +365,11 @@ func NewParsedRequestFromRequest(r *http.Request, logger *logrus.Entry) (ParsedR
UUID: uuid.New().String(),
ClientHost: clientHost,
ClientIP: clientIP,
URI: parsedURL.Path,
URI: clientURI,
Method: clientMethod,
Host: r.Host,
Host: clientHost,
Headers: r.Header,
URL: r.URL,
URL: parsedURL,
Proto: r.Proto,
Body: body,
Args: ParseQuery(parsedURL.RawQuery),