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Macide Celik 2019-10-29 13:03:20 +03:00 • committed by GitHub
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src/core/operations/ExtractFiles.mjs
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/**
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2018
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import Utils from "../Utils.mjs";
import {scanForFileTypes, extractFile} from "../lib/FileType.mjs";
import {FILE_SIGNATURES} from "../lib/FileSignatures.mjs";
/**
* Extract Files operation
*/
class ExtractFiles extends Operation {
/**
* ExtractFiles constructor
*/
constructor() {
super();
this.name = "Extract Files";
this.module = "Default";
this.description = "Performs file carving to attempt to extract files from the input.<br><br>This operation is currently capable of carving out the following formats:<ul><li>JPG</li><li>EXE</li><li>ZIP</li><li>PDF</li><li>PNG</li><li>BMP</li><li>FLV</li><li>RTF</li><li>DOCX, PPTX, XLSX</li><li>EPUB</li><li>GZIP</li><li>ZLIB</li><li>ELF, BIN, AXF, O, PRX, SO</li></ul>";
this.infoURL = "https://forensicswiki.org/wiki/File_Carving";
this.inputType = "ArrayBuffer";
this.outputType = "List<File>";
this.presentType = "html";
this.args = Object.keys(FILE_SIGNATURES).map(cat => {
return {
name: cat,
type: "boolean",
value: cat === "Miscellaneous" ? false : true
};
}).concat([
{
name: "Ignore failed extractions",
type: "boolean",
value: "true"
}
]);
}
/**
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {List<File>}
*/
run(input, args) {
const bytes = new Uint8Array(input),
categories = [],
ignoreFailedExtractions = args.pop(1);
args.forEach((cat, i) => {
if (cat) categories.push(Object.keys(FILE_SIGNATURES)[i]);
});
// Scan for embedded files
const detectedFiles = scanForFileTypes(bytes, categories);
// Extract each file that we support
const files = [];
const errors = [];
detectedFiles.forEach(detectedFile => {
try {
files.push(extractFile(bytes, detectedFile.fileDetails, detectedFile.offset));
} catch (err) {
if (!ignoreFailedExtractions && err.message.indexOf("No extraction algorithm available") < 0) {
errors.push(
`Error while attempting to extract ${detectedFile.fileDetails.name} ` +
`at offset ${detectedFile.offset}:\n` +
`${err.message}`
);
}
}
});
if (errors.length) {
throw new OperationError(errors.join("\n\n"));
}
return files;
}
/**
* Displays the files in HTML for web apps.
*
* @param {File[]} files
* @returns {html}
*/
async present(files) {
return await Utils.displayFilesAsHTML(files);
}
}
export default ExtractFiles;