mirror of https://github.com/OISF/suricata
Philippe Antoine
2 years ago
committed by
Victor Julien
parent
0e5b49d20f
commit
f0414570d2
@ -0,0 +1,179 @@
|
|||||||
|
/* Copyright (C) 2024 Open Information Security Foundation
|
||||||
|
*
|
||||||
|
* You can copy, redistribute or modify this Program under the terms of
|
||||||
|
* the GNU General Public License version 2 as published by the Free
|
||||||
|
* Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful,
|
||||||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
* GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License
|
||||||
|
* version 2 along with this program; if not, write to the Free Software
|
||||||
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
||||||
|
* 02110-1301, USA.
|
||||||
|
*/
|
||||||
|
|
||||||
|
use super::{
|
||||||
|
DetectHelperTransformRegister, DetectSignatureAddTransform, InspectionBufferCheckAndExpand,
|
||||||
|
InspectionBufferLength, InspectionBufferPtr, InspectionBufferTruncate, SCTransformTableElmt,
|
||||||
|
};
|
||||||
|
use crate::detect::SIGMATCH_NOOPT;
|
||||||
|
|
||||||
|
use std::os::raw::{c_int, c_void};
|
||||||
|
use std::ptr;
|
||||||
|
|
||||||
|
static mut G_TRANSFORM_TOLOWER_ID: c_int = 0;
|
||||||
|
static mut G_TRANSFORM_TOUPPER_ID: c_int = 0;
|
||||||
|
|
||||||
|
#[no_mangle]
|
||||||
|
unsafe extern "C" fn tolower_setup(
|
||||||
|
_de: *mut c_void, s: *mut c_void, _raw: *const std::os::raw::c_char,
|
||||||
|
) -> c_int {
|
||||||
|
return DetectSignatureAddTransform(s, G_TRANSFORM_TOLOWER_ID, ptr::null_mut());
|
||||||
|
}
|
||||||
|
|
||||||
|
fn tolower_transform_do(input: &[u8], output: &mut [u8]) {
|
||||||
|
for (i, o) in input.iter().zip(output.iter_mut()) {
|
||||||
|
*o = (*i).to_ascii_lowercase();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[no_mangle]
|
||||||
|
unsafe extern "C" fn tolower_transform(buffer: *mut c_void, _ctx: *mut c_void) {
|
||||||
|
let input = InspectionBufferPtr(buffer);
|
||||||
|
let input_len = InspectionBufferLength(buffer);
|
||||||
|
if input.is_null() || input_len == 0 {
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
let input = build_slice!(input, input_len as usize);
|
||||||
|
|
||||||
|
let output = InspectionBufferCheckAndExpand(buffer, input_len);
|
||||||
|
if output.is_null() {
|
||||||
|
// allocation failure
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
let output = std::slice::from_raw_parts_mut(output, input_len as usize);
|
||||||
|
|
||||||
|
tolower_transform_do(input, output);
|
||||||
|
|
||||||
|
InspectionBufferTruncate(buffer, input_len);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[no_mangle]
|
||||||
|
unsafe extern "C" fn tolower_validate(content: *const u8, len: u16, _ctx: *mut c_void) -> bool {
|
||||||
|
let input = build_slice!(content, len as usize);
|
||||||
|
for &c in input {
|
||||||
|
if c.is_ascii_uppercase() {
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
#[no_mangle]
|
||||||
|
pub unsafe extern "C" fn DetectTransformToLowerRegister() {
|
||||||
|
let kw = SCTransformTableElmt {
|
||||||
|
name: b"to_lowercase\0".as_ptr() as *const libc::c_char,
|
||||||
|
desc: b"convert buffer to lowercase\0".as_ptr() as *const libc::c_char,
|
||||||
|
url: b"/rules/transforms.html#to_lowercase\0".as_ptr() as *const libc::c_char,
|
||||||
|
Setup: tolower_setup,
|
||||||
|
flags: SIGMATCH_NOOPT,
|
||||||
|
Transform: tolower_transform,
|
||||||
|
Free: None,
|
||||||
|
TransformValidate: Some(tolower_validate),
|
||||||
|
};
|
||||||
|
unsafe {
|
||||||
|
G_TRANSFORM_TOLOWER_ID = DetectHelperTransformRegister(&kw);
|
||||||
|
if G_TRANSFORM_TOLOWER_ID < 0 {
|
||||||
|
SCLogWarning!("Failed registering transform tolower");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[no_mangle]
|
||||||
|
unsafe extern "C" fn toupper_setup(
|
||||||
|
_de: *mut c_void, s: *mut c_void, _raw: *const std::os::raw::c_char,
|
||||||
|
) -> c_int {
|
||||||
|
return DetectSignatureAddTransform(s, G_TRANSFORM_TOUPPER_ID, ptr::null_mut());
|
||||||
|
}
|
||||||
|
|
||||||
|
fn toupper_transform_do(input: &[u8], output: &mut [u8]) {
|
||||||
|
for (i, o) in input.iter().zip(output.iter_mut()) {
|
||||||
|
*o = (*i).to_ascii_uppercase();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[no_mangle]
|
||||||
|
unsafe extern "C" fn toupper_transform(buffer: *mut c_void, _ctx: *mut c_void) {
|
||||||
|
let input = InspectionBufferPtr(buffer);
|
||||||
|
let input_len = InspectionBufferLength(buffer);
|
||||||
|
if input.is_null() || input_len == 0 {
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
let input = build_slice!(input, input_len as usize);
|
||||||
|
|
||||||
|
let output = InspectionBufferCheckAndExpand(buffer, input_len);
|
||||||
|
if output.is_null() {
|
||||||
|
// allocation failure
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
let output = std::slice::from_raw_parts_mut(output, input_len as usize);
|
||||||
|
|
||||||
|
toupper_transform_do(input, output);
|
||||||
|
|
||||||
|
InspectionBufferTruncate(buffer, input_len);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[no_mangle]
|
||||||
|
unsafe extern "C" fn toupper_validate(content: *const u8, len: u16, _ctx: *mut c_void) -> bool {
|
||||||
|
let input = build_slice!(content, len as usize);
|
||||||
|
for &c in input {
|
||||||
|
if c.is_ascii_lowercase() {
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
#[no_mangle]
|
||||||
|
pub unsafe extern "C" fn DetectTransformToUpperRegister() {
|
||||||
|
let kw = SCTransformTableElmt {
|
||||||
|
name: b"to_uppercase\0".as_ptr() as *const libc::c_char,
|
||||||
|
desc: b"convert buffer to uppercase\0".as_ptr() as *const libc::c_char,
|
||||||
|
url: b"/rules/transforms.html#to_uppercase\0".as_ptr() as *const libc::c_char,
|
||||||
|
Setup: toupper_setup,
|
||||||
|
flags: SIGMATCH_NOOPT,
|
||||||
|
Transform: toupper_transform,
|
||||||
|
Free: None,
|
||||||
|
TransformValidate: Some(toupper_validate),
|
||||||
|
};
|
||||||
|
unsafe {
|
||||||
|
G_TRANSFORM_TOUPPER_ID = DetectHelperTransformRegister(&kw);
|
||||||
|
if G_TRANSFORM_TOUPPER_ID < 0 {
|
||||||
|
SCLogWarning!("Failed registering transform toupper");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use super::*;
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_tolower_transform() {
|
||||||
|
let buf = b" A b C D ";
|
||||||
|
let mut out = vec![0; buf.len()];
|
||||||
|
tolower_transform_do(buf, &mut out);
|
||||||
|
assert_eq!(out, b" a b c d ");
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_toupper_transform() {
|
||||||
|
let buf = b" A b C D ";
|
||||||
|
let mut out = vec![0; buf.len()];
|
||||||
|
toupper_transform_do(buf, &mut out);
|
||||||
|
assert_eq!(out, b" A B C D ");
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -1,169 +0,0 @@
|
|||||||
/* Copyright (C) 2023 Open Information Security Foundation
|
|
||||||
*
|
|
||||||
* You can copy, redistribute or modify this Program under the terms of
|
|
||||||
* the GNU General Public License version 2 as published by the Free
|
|
||||||
* Software Foundation.
|
|
||||||
*
|
|
||||||
* This program is distributed in the hope that it will be useful,
|
|
||||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
||||||
* GNU General Public License for more details.
|
|
||||||
*
|
|
||||||
* You should have received a copy of the GNU General Public License
|
|
||||||
* version 2 along with this program; if not, write to the Free Software
|
|
||||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
||||||
* 02110-1301, USA.
|
|
||||||
*/
|
|
||||||
|
|
||||||
/**
|
|
||||||
* \file
|
|
||||||
*
|
|
||||||
* \author Jeff Lucovsky <jlucovsky@oisf.net>
|
|
||||||
*
|
|
||||||
* Implements case changing transforms
|
|
||||||
*/
|
|
||||||
|
|
||||||
#include "suricata-common.h"
|
|
||||||
#include "detect.h"
|
|
||||||
#include "detect-engine.h"
|
|
||||||
#include "detect-parse.h"
|
|
||||||
#include "detect-transform-casechange.h"
|
|
||||||
|
|
||||||
/**
|
|
||||||
* \internal
|
|
||||||
* \brief Register the to_lowercase transform
|
|
||||||
* \param det_ctx detection engine ctx
|
|
||||||
* \param s signature
|
|
||||||
* \param optstr options string
|
|
||||||
* \retval 0 ok
|
|
||||||
* \retval -1 failure
|
|
||||||
*/
|
|
||||||
static int DetectTransformToLowerSetup(DetectEngineCtx *de_ctx, Signature *s, const char *optstr)
|
|
||||||
{
|
|
||||||
SCEnter();
|
|
||||||
|
|
||||||
int r = DetectSignatureAddTransform(s, DETECT_TRANSFORM_TOLOWER, NULL);
|
|
||||||
|
|
||||||
SCReturnInt(r);
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* \internal
|
|
||||||
* \brief Apply the to_lowercase keyword to the last pattern match
|
|
||||||
* \param buffer Inspection buffer
|
|
||||||
* \param optstr options string
|
|
||||||
*/
|
|
||||||
static void DetectTransformToLower(InspectionBuffer *buffer, void *options)
|
|
||||||
{
|
|
||||||
const uint8_t *input = buffer->inspect;
|
|
||||||
const uint32_t input_len = buffer->inspect_len;
|
|
||||||
|
|
||||||
if (input_len == 0) {
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
|
|
||||||
uint8_t output[input_len];
|
|
||||||
for (uint32_t i = 0; i < input_len; i++) {
|
|
||||||
output[i] = u8_tolower(input[i]);
|
|
||||||
}
|
|
||||||
|
|
||||||
InspectionBufferCopy(buffer, output, input_len);
|
|
||||||
}
|
|
||||||
/**
|
|
||||||
* \internal
|
|
||||||
* \brief Register the to_upperrcase transform
|
|
||||||
* \param det_ctx detection engine ctx
|
|
||||||
* \param s signature
|
|
||||||
* \param optstr options string
|
|
||||||
* \retval 0 ok
|
|
||||||
* \retval -1 failure
|
|
||||||
*/
|
|
||||||
static int DetectTransformToUpperSetup(DetectEngineCtx *de_ctx, Signature *s, const char *optstr)
|
|
||||||
{
|
|
||||||
SCEnter();
|
|
||||||
|
|
||||||
int r = DetectSignatureAddTransform(s, DETECT_TRANSFORM_TOUPPER, NULL);
|
|
||||||
|
|
||||||
SCReturnInt(r);
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* \internal
|
|
||||||
* \brief Apply the to_uppercase keyword to the last pattern match
|
|
||||||
* \param buffer Inspection buffer
|
|
||||||
* \param optstr options string
|
|
||||||
*/
|
|
||||||
static void DetectTransformToUpper(InspectionBuffer *buffer, void *options)
|
|
||||||
{
|
|
||||||
const uint8_t *input = buffer->inspect;
|
|
||||||
const uint32_t input_len = buffer->inspect_len;
|
|
||||||
|
|
||||||
if (input_len == 0) {
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
|
|
||||||
uint8_t output[input_len];
|
|
||||||
for (uint32_t i = 0; i < input_len; i++) {
|
|
||||||
output[i] = u8_toupper(input[i]);
|
|
||||||
}
|
|
||||||
|
|
||||||
InspectionBufferCopy(buffer, output, input_len);
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
|
||||||
* \internal
|
|
||||||
* \brief Check if content is compatible with transform
|
|
||||||
*
|
|
||||||
* If the content contains any lowercase characters, than it is not compatible.
|
|
||||||
*/
|
|
||||||
static bool TransformToUpperValidate(const uint8_t *content, uint16_t content_len, void *options)
|
|
||||||
{
|
|
||||||
if (content) {
|
|
||||||
for (uint32_t i = 0; i < content_len; i++) {
|
|
||||||
if (islower(*content++)) {
|
|
||||||
return false;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
return true;
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
|
||||||
* \internal
|
|
||||||
* \brief Check if content is compatible with transform
|
|
||||||
*
|
|
||||||
* If the content contains any uppercase characters, than it is not compatible.
|
|
||||||
*/
|
|
||||||
static bool TransformToLowerValidate(const uint8_t *content, uint16_t content_len, void *options)
|
|
||||||
{
|
|
||||||
if (content) {
|
|
||||||
for (uint32_t i = 0; i < content_len; i++) {
|
|
||||||
if (isupper(*content++)) {
|
|
||||||
return false;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
return true;
|
|
||||||
}
|
|
||||||
|
|
||||||
void DetectTransformToUpperRegister(void)
|
|
||||||
{
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOUPPER].name = "to_uppercase";
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOUPPER].desc = "convert buffer to uppercase";
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOUPPER].url = "/rules/transforms.html#to_uppercase";
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOUPPER].Transform = DetectTransformToUpper;
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOUPPER].TransformValidate = TransformToUpperValidate;
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOUPPER].Setup = DetectTransformToUpperSetup;
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOUPPER].flags |= SIGMATCH_NOOPT;
|
|
||||||
}
|
|
||||||
|
|
||||||
void DetectTransformToLowerRegister(void)
|
|
||||||
{
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOLOWER].name = "to_lowercase";
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOLOWER].desc = "convert buffer to lowercase";
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOLOWER].url = "/rules/transforms.html#to_lowercase";
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOLOWER].Transform = DetectTransformToLower;
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOLOWER].TransformValidate = TransformToLowerValidate;
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOLOWER].Setup = DetectTransformToLowerSetup;
|
|
||||||
sigmatch_table[DETECT_TRANSFORM_TOLOWER].flags |= SIGMATCH_NOOPT;
|
|
||||||
}
|
|
||||||
@ -1,31 +0,0 @@
|
|||||||
/* Copyright (C) 2023 Open Information Security Foundation
|
|
||||||
*
|
|
||||||
* You can copy, redistribute or modify this Program under the terms of
|
|
||||||
* the GNU General Public License version 2 as published by the Free
|
|
||||||
* Software Foundation.
|
|
||||||
*
|
|
||||||
* This program is distributed in the hope that it will be useful,
|
|
||||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
||||||
* GNU General Public License for more details.
|
|
||||||
*
|
|
||||||
* You should have received a copy of the GNU General Public License
|
|
||||||
* version 2 along with this program; if not, write to the Free Software
|
|
||||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
||||||
* 02110-1301, USA.
|
|
||||||
*/
|
|
||||||
|
|
||||||
/**
|
|
||||||
* \file
|
|
||||||
*
|
|
||||||
* \author Jeff Lucovsky <jlucovsky@oisf.net>
|
|
||||||
*/
|
|
||||||
|
|
||||||
#ifndef SURICATA_DETECT_TRANSFORM_CASECHANGE_H
|
|
||||||
#define SURICATA_DETECT_TRANSFORM_CASECHANGE_H
|
|
||||||
|
|
||||||
/* prototypes */
|
|
||||||
void DetectTransformToLowerRegister(void);
|
|
||||||
void DetectTransformToUpperRegister(void);
|
|
||||||
|
|
||||||
#endif /* SURICATA_DETECT_TRANSFORM_CASECHANGE_H */
|
|
||||||
Loading…
Reference in New Issue