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// Copyright 2023 Google LLC
//
// 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.
//
////////////////////////////////////////////////////////////////////////////////
/**
* Command for generating template fuzzers. This is a short-cut for rapid
* prototyping as well as an archive for inspiration.
*/
import * as vscode from 'vscode';
import {println} from '../logger';
export const cLangSimpleStringFuzzer = `#include <stdint.h>
#include <string.h>
#include <stdlib.h>
int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
char *new_str = (char *)malloc(size+1);
if (new_str == NULL){
return 0;
}
memcpy(new_str, data, size);
new_str[size] = '\\0';
// Insert fuzzer contents here
// fuzz data in new_str
// end of fuzzer contents
free(new_str);
return 0;
}`;
const cLangFileInputFuzzer = `int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
char filename[256];
sprintf(filename, "/tmp/libfuzzer.%d", getpid());
// Create a file on the filesystem with fuzzer data in it
FILE *fp = fopen(filename, "wb");
if (!fp) {
return 0;
}
fwrite(data, size, 1, fp);
fclose(fp);
// Fuzzer logic here. Use the file as a source of data.
// Fuzzer logic end
// Clean up the file.
unlink(filename);
return 0;
}`;
const cLangBareTemplateFuzzer = `int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
return 0;
}`;
const cppLangBareTemplateFuzzer = `extern "C" int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
return 0;
}`;
const cppLangStdStringTemplateFuzzer = `extern "C" int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
std::string input(reinterpret_cast<const char*>(data), size);
return 0;
}`;
export const cppLangFDPTemplateFuzzer = `#include <fuzzer/FuzzedDataProvider.h>
#include <string>
extern "C" int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
FuzzedDataProvider fdp(data, size);
// Extract higher level data types used for fuzzing, e.g.
// int ran_int = fdp.ConsumeIntegralInRange<int>(1, 1024);
// std::string s = fdp.ConsumeRandomLengthString();
return 0;
}`;
const cppLangFileInputFuzzer = `extern "C" int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
char filename[256];
sprintf(filename, "/tmp/libfuzzer.%d", getpid());
FILE *fp = fopen(filename, "wb");
if (!fp) {
return 0;
}
fwrite(data, size, 1, fp);
fclose(fp);
// Fuzzer logic here
// Fuzzer logic end
unlink(filename);
}`;
const pythonLangBareTemplate = `import sys
import atheris
def TestOneInput(fuzz_bytes):
return
def main():
atheris.Setup(sys.argv, TestOneInput)
atheris.Fuzz()
if __name__ == "__main__":
main()`;
export const pythonLangFileInputFuzzer = `import sys
import atheris
@atheris.instrument_func
def TestOneInput(data):
# Write fuzz data to a file
with open('/tmp/fuzz_input.b') as f:
f.write(data)
# Use '/tmp/fuzz_input.b' as input to file handling logic.
def main():
atheris.instrument_all()
atheris.Setup(sys.argv, TestOneInput)
atheris.Fuzz()
if __name__ == "__main__":
main()`;
const pythonLongFdpTemplate = `import sys
import atheris
def TestOneInput(fuzz_bytes):
fdp = atheris.FuzzedDataProvider(fuzz_bytes)
return
def main():
atheris.Setup(sys.argv, TestOneInput)
atheris.Fuzz()
if __name__ == "__main__":
main()`;
export const javaLangBareTemplate = `import com.code_intelligence.jazzer.api.FuzzedDataProvider;
public class SampleFuzzer {
public static void fuzzerTestOneInput(FuzzedDataProvider fdp) {
// Use fdp to create arbitrary types seeded with fuzz data
}
}
`;
/**
* C templates
*/
async function cTemplates() {
let template = '';
const result = await vscode.window.showQuickPick(
['Bare template', 'Null-terminated string input', 'File input'],
{
placeHolder: 'Pick which template',
}
);
vscode.window.showInformationMessage(`Got: ${result}`);
if (result === 'Null-terminated string input') {
template = cLangSimpleStringFuzzer;
} else if (result === 'File input') {
template = cLangFileInputFuzzer;
} else if (result === 'Bare template') {
template = cLangBareTemplateFuzzer;
} else {
template = 'empty';
}
const workspaceFolder = vscode.workspace.workspaceFolders;
if (!workspaceFolder) {
return;
}
const wsPath = workspaceFolder[0].uri.fsPath; // gets the path of the first workspace folder
const cifuzzYml = vscode.Uri.file(wsPath + '/oss-fuzz-template.c');
const wsedit = new vscode.WorkspaceEdit();
wsedit.createFile(cifuzzYml, {ignoreIfExists: true});
wsedit.insert(cifuzzYml, new vscode.Position(0, 0), template);
vscode.workspace.applyEdit(wsedit);
return;
}
/**
* CPP templates
*/
async function cppTemplates() {
let template = '';
const result = await vscode.window.showQuickPick(
[
'Bare template',
'Simple CPP string',
'File input fuzzer',
'Fuzzed data provider',
],
{
placeHolder: 'Pick which template',
}
);
vscode.window.showInformationMessage(`Got: ${result}`);
if (result === 'Bare template') {
template = cppLangBareTemplateFuzzer;
} else if (result === 'Simple CPP string') {
template = cppLangStdStringTemplateFuzzer;
} else if (result === 'File input fuzzer') {
template = cppLangFileInputFuzzer;
} else if (result === 'Fuzzed data provider') {
template = cppLangFDPTemplateFuzzer;
} else {
template = 'empty';
}
const workspaceFolder = vscode.workspace.workspaceFolders;
if (!workspaceFolder) {
return;
}
const wsPath = workspaceFolder[0].uri.fsPath; // gets the path of the first workspace folder
const cifuzzYml = vscode.Uri.file(wsPath + '/oss-fuzz-template.cpp');
const wsedit = new vscode.WorkspaceEdit();
wsedit.createFile(cifuzzYml, {ignoreIfExists: true});
wsedit.insert(cifuzzYml, new vscode.Position(0, 0), template);
vscode.workspace.applyEdit(wsedit);
return;
}
/**
* Python templates
*/
async function pythonTepmlates() {
let template = '';
const result = await vscode.window.showQuickPick(
['Bare template', 'Fuzzed Data Provider', 'File input fuzzer'],
{
placeHolder: 'Pick which template',
}
);
vscode.window.showInformationMessage(`Got: ${result}`);
if (result === 'Fuzzed Data Provider') {
template = pythonLongFdpTemplate;
} else if (result === 'Bare template') {
template = pythonLangBareTemplate;
} else if (result === 'File input fuzzer') {
template = pythonLangFileInputFuzzer;
} else {
template = 'empty';
}
const workspaceFolder = vscode.workspace.workspaceFolders;
if (!workspaceFolder) {
return;
}
const wsPath = workspaceFolder[0].uri.fsPath; // gets the path of the first workspace folder
const cifuzzYml = vscode.Uri.file(wsPath + '/oss-fuzz-template.py');
const wsedit = new vscode.WorkspaceEdit();
wsedit.createFile(cifuzzYml, {ignoreIfExists: true});
wsedit.insert(cifuzzYml, new vscode.Position(0, 0), template);
vscode.workspace.applyEdit(wsedit);
return;
}
/**
* Java templates
*/
async function javaTemplates() {
let template = '';
const result = await vscode.window.showQuickPick(['Bare template'], {
placeHolder: 'Pick which template',
});
vscode.window.showInformationMessage(`Got: ${result}`);
if (result === 'Bare template') {
template = javaLangBareTemplate;
} else {
template = 'empty';
}
const workspaceFolder = vscode.workspace.workspaceFolders;
if (!workspaceFolder) {
return;
}
const wsPath = workspaceFolder[0].uri.fsPath; // gets the path of the first workspace folder
const cifuzzYml = vscode.Uri.file(wsPath + '/oss-fuzz-template.java');
const wsedit = new vscode.WorkspaceEdit();
wsedit.createFile(cifuzzYml, {ignoreIfExists: true});
wsedit.insert(cifuzzYml, new vscode.Position(0, 0), template);
vscode.workspace.applyEdit(wsedit);
return;
}
export async function cmdDispatcherTemplate(context: vscode.ExtensionContext) {
println('Creating template');
const options: {
[key: string]: (context: vscode.ExtensionContext) => Promise<void>;
} = {
C: cTemplates,
CPP: cppTemplates,
Python: pythonTepmlates,
Java: javaTemplates,
};
const quickPick = vscode.window.createQuickPick();
quickPick.items = Object.keys(options).map(label => ({label}));
quickPick.onDidChangeSelection(selection => {
if (selection[0]) {
options[selection[0].label](context).catch(console.error);
}
});
quickPick.onDidHide(() => quickPick.dispose());
quickPick.placeholder = 'Pick language';
quickPick.show();
return;
}
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