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Fix Arbitary Code Execution using execFile and spawn #7

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Fix Arbitary Code Execution using execFile and spawn #7

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53 changes: 46 additions & 7 deletions openjtalk.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
var exec = require('child_process').exec
var execFile = require('child_process').execFile
, spawn = require('child_process').spawn
, path = require('path')
, uuid = require('uuid-v4')
;
Expand Down Expand Up @@ -59,8 +60,8 @@ OpenJTalk.prototype = {
case 'linux' : player = 'aplay'; break;
default : player = 'play'; break;
}
var cmd = player+ ' ' + wavFileName + '&& rm ' + wavFileName;
exec(cmd, function(err, stdout, stderr) {
execFile(player, [wavFileName], function(err, stdout, stderr) {
execFile('rm', [wavFileName]);
if (callback) callback(err, stdout, stderr);
});
},
Expand All @@ -69,7 +70,7 @@ OpenJTalk.prototype = {
_makeWav : function (str, pitch, callback) {
var wavFileName = uuid() + '.wav';

var ojtCmd = this.openjtalk_bin;
var ojtCmd = [this.openjtalk_bin];
var options = {
m : this.htsvoice,
x : this.dic_dir,
Expand All @@ -86,19 +87,57 @@ OpenJTalk.prototype = {
for (var option in options) {
var value = options[option];
if (value) {
ojtCmd += ' -' + option + ' ' + value;
ojtCmd.push('-' + option);
ojtCmd.push(value);
}
}

var cmd = 'echo "' + str + '" | ' + ojtCmd;
exec(cmd, function(err, stdout, stderr) {
this._securePipeExec('echo', [str], ojtCmd[0], ojtCmd.slice(1), function(err, stdout, stderr) {
var result = {
stdout : stdout,
stderr : stderr,
wav : wavFileName
};
if (callback) callback(err, result);
});
},

// Securely execute piped commands
_securePipeExec : function (cmd1, cmd1Args, cmd2, cmd2Args, callback) {
let stdout = '';
let stderr = '';
const spCmd1 = spawn(cmd1, cmd1Args);
const spCmd2 = spawn(cmd2, cmd2Args);

spCmd1.stdout.on('data', (data) => {
spCmd2.stdin.write(data);
});

spCmd1.stderr.on('data', (data) => {
stderr += data;
});

spCmd1.on('close', (code) => {
if (code !== 0) {
console.error(`${cmd1} process exited with code ${code}`);
}
spCmd2.stdin.end();
});

spCmd2.stdout.on('data', (data) => {
stdout += data.toString();
});

spCmd2.stderr.on('data', (data) => {
stderr+= data;
});

spCmd2.on('close', (code) => {
if (code !== 0) {
console.error(`${cmd2} process exited with code ${code}`);
}
if (callback) callback(code, stdout, stderr);
});
}
};

Expand Down