gPass/chrome_addon/lib/main.js

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/*
Copyright (C) 2013-2017 Grégory Soutadé
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This file is part of gPass.
gPass is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
gPass 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
along with gPass. If not, see <http://www.gnu.org/licenses/>.
*/
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var DEBUG = false;
var protocol_version = 4;
var account_url = null;
var crypto_v2_logins_size = 0;
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SERVER = {OK : 0, FAILED : 1, RESTART_REQUEST : 2};
// http://stackoverflow.com/questions/3745666/how-to-convert-from-hex-to-ascii-in-javascript
function hex2a(hex) {
var str = '';
for (var i = 0; i < hex.length; i += 2)
str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
return str;
}
function a2hex(_str_) {
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var hex = '';
for (var i = 0; i < _str_.length; i++)
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{
var c = _str_.charCodeAt(i).toString(16);
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if (c.length == 1) c = "0" + c;
hex += c;
}
return hex;
}
function debug(s)
{
if (DEBUG)
console.log(s);
}
async function generate_request(domain, login, mkey, iv, old)
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{
if (old)
{
var v = "@@" + domain + ";" + login;
debug("will encrypt " + v);
enc = encrypt_ecb(mkey, v);
}
else
{
var v = domain + ";" + login;
debug("will encrypt " + v);
while ((v.length % 16))
v += "\0";
hash = await digest(v);
v += hash.slice(8, 24);
enc = encrypt_cbc(mkey, iv, v);
}
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return enc;
}
async function ask_server(form, field, logins, domain, wdomain, mkey, submit)
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{
account_url = await getPref("account_url");
var salt = parseURI.parseUri(account_url);
salt = salt["host"] + salt["path"];
debug("salt " + salt);
pbkdf2_level = await getPref("pbkdf2_level");
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global_iv = await simple_pbkdf2(salt, mkey, pbkdf2_level);
global_iv = global_iv.slice(0, 16);
mkey = crypto_pbkdf2(mkey, salt, pbkdf2_level);
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debug("global_iv " + a2hex(global_iv));
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keys = "";
for(key_index=0, a=0; a<logins.length; a++, key_index++)
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{
enc = await generate_request(domain, logins[a], mkey, global_iv, 0);
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keys += (keys.length != 0) ? "&" : "";
keys += "k" + key_index + "=" + a2hex(enc);
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if (wdomain != "")
{
enc = await generate_request(wdomain, logins[a], mkey, global_iv, 0);
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keys += (keys.length != 0) ? "&" : "";
keys += "k" + (++key_index) + "=" + a2hex(enc);
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}
}
crypto_v2_logins_size = key_index;
if (await getPref("crypto_v1_compatible"))
{
for(a=0; a<logins.length; a++, key_index++)
{
enc = await generate_request(domain, logins[a], mkey, global_iv, 1);
keys += (keys.length != 0) ? "&" : "";
keys += "k" + key_index + "=" + a2hex(enc);
if (wdomain != "")
{
enc = await generate_request(wdomain, logins[a], mkey, global_iv, 1);
keys += (keys.length != 0) ? "&" : "";
keys += "k" + (++key_index) + "=" + a2hex(enc);
}
}
}
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debug("Keys " + keys);
var gPassRequest = new XMLHttpRequest();
var ret = SERVER.OK;
// gPassRequest.addEventListener("progress", function(evt) { ; }, false);
gPassRequest.addEventListener("load", async function(evt) {
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var ciphered_password = "";
var server_pbkdf2_level = 0;
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var server_version = 0;
var matched_key = 0;
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var r = this.responseText.split("\n");
debug("resp " + r);
for(var a=0; a<r.length; a++)
{
debug("Analyse " + r[a]);
params = r[a].split("=");
if (params.length != 2 && params[0] != "<end>")
{
notify("Error : It seems that it's not a gPass server",
this.responseText);
ret = SERVER.FAILED;
break;
}
switch(params[0])
{
case "protocol":
debug("protocol : " + params[1]);
if (params[1].indexOf("gpass-") != 0)
{
notify("Error : It seems that it's not a gPass server",
this.responseText);
ret = SERVER.FAILED;
break;
}
server_protocol_version = params[1].match(/\d+/)[0];
if (server_protocol_version > protocol_version)
{
notify("Protocol version not supported, please upgrade your addon",
"Protocol version not supported, please upgrade your addon");
ret = SERVER.FAILED;
}
else
{
switch (server_protocol_version)
{
case 2:
server_pbkdf2_level = 1000;
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break;
case 3:
// Version 3 : nothing special to do
case 4:
// Version 4 : nothing special to do
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break;
}
}
break;
case "matched_key":
matched_key = params[1];
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case "pass":
ciphered_password = params[1];
break;
case "pkdbf2_level":
case "pbkdf2_level":
server_pbkdf2_level = parseInt(params[1].match(/\d+/)[0], 10);
if (server_pbkdf2_level != NaN &&
server_pbkdf2_level != pbkdf2_level &&
server_pbkdf2_level >= 1000) // Minimum level for PBKDF2 !
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{
debug("New pbkdf2 level " + server_pbkdf2_level);
pbkdf2_level = server_pbkdf2_level;
setPref("pbkdf2_level", pbkdf2_level);
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ret = SERVER.RESTART_REQUEST;
}
break;
case "<end>":
break;
default:
debug("Unknown command " + params[0]);
notify("Error : It seems that it's not a gPass server",
this.responseText);
ret = SERVER.FAILED;
break;
}
}
if (ret != SERVER.OK)
{
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return;
}
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if (ciphered_password != "")
{
debug("Ciphered password : " + ciphered_password);
if (matched_key >= crypto_v2_logins_size)
// Crypto v1
{
clear_password = await decrypt_ecb(mkey, hex2a(ciphered_password));
// Remove trailing \0 and salt
clear_password = clear_password.replace(/\0*$/, "");
clear_password = clear_password.substr(0, clear_password.length-3);
}
else
{
clear_password = await decrypt_cbc(mkey, global_iv, hex2a(ciphered_password));
clear_password = clear_password.replace(/\0*$/, "");
clear_password = clear_password.substr(3, clear_password.length);
}
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debug("Clear password " + clear_password);
field.value = clear_password;
// Remove gPass event listener and submit again with clear password
if (submit)
{
form.removeEventListener("submit", on_sumbit, true);
// Propagate change
change_cb = field.onchange;
if (change_cb)
change_cb();
// Try to type "enter"
var evt = new KeyboardEvent("keydown");
delete evt.which;
evt.which = 13;
field.dispatchEvent(evt);
// Submit form
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form.submit();
}
else
{
notify("Password successfully replaced",
"Password successfully replaced");
}
}
else
{
debug("No password found");
ret = SERVER.FAILED;
notify("No password found in database",
"No password found in database");
}
}, false);
gPassRequest.addEventListener("error", function(evt) {
debug("error");
ret = false;
notify("Error",
"Error");
}, false);
debug("connect to " + account_url);
gPassRequest.open("POST", account_url, true);
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gPassRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
gPassRequest.send(keys);
return ret;
}
function wildcard_domain(domain)
{
var parts = domain.split(".");
// Standard root domain (zzz.xxx.com) or more
if (parts.length > 2)
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{
res = "*.";
for (i=1; i<parts.length; i++)
res += parts[i];
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}
// Simple xxx.com
else if (parts.length == 2)
return "*." + domain;
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return "";
}
function _add_name(logins, name)
{
for(var i=0; i<logins.length; i++)
if (logins[i] == name) return ;
logins.push(name);
}
function try_get_name(fields, type_filters, match)
{
var user = null;
var all_logins = new Array();
for (var i=0; i<fields.length; i++)
{
var field = fields[i];
for (var a=0; a<type_filters.length; a++)
{
if ((match && field.getAttribute("type") == type_filters[a]) ||
(!match && field.getAttribute("type") != type_filters[a]))
{
if (field.hasAttribute("name") && field.value != "")
{
name = field.getAttribute("name");
// Subset of common user field
if (name == "user") user = field.value;
else if (name == "usr") user = field.value;
else if (name == "username") user = field.value;
else if (name == "login") user = field.value;
_add_name(all_logins, field.value);
}
}
}
}
if (user != null)
return new Array(user);
else
return all_logins;
}
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function on_sumbit(e)
{
var form = this;
var fields = form.getElementsByTagName("input");
var domain = parseURI.parseUri(form.ownerDocument.baseURI);
domain = domain["host"];
var wdomain = wildcard_domain(domain);
type_filters = new Array();
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// Get all <input type="text"> && <input type="email">
type_filters.push("text");
type_filters.push("email");
logins = try_get_name(fields, type_filters, true);
// Get all other fields except text, email and password
if (!logins.length)
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{
type_filters.push("password");
logins = try_get_name(fields, type_filters, false);
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}
// Look for <input type="password" value="@@...">
for (var i=0; i<fields.length; i++)
{
var field = fields[i];
if (field.getAttribute("type") == "password")
{
debug(field.value);
password = field.value;
if (password.indexOf("@@") != 0 && password.indexOf("@_") != 0)
continue;
// Remove current value to limit master key stealing
field.value = "";
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mkey = password.substring(2);
e.preventDefault();
var ret = ask_server(form, field, logins, domain, wdomain, mkey, (password.indexOf("@@") == 0));
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ret.then(function(ret){
switch(ret)
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{
case SERVER.OK:
break;
case SERVER.FAILED:
if (logins !== all_logins)
{
ask_server(form, field, all_logins, domain, wdomain, mkey, (password.indexOf("@@") == 0));
}
break;
case SERVER.RESTART_REQUEST:
i = -1; // Restart loop
break;
}
});
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}
}
return false;
}
function document_loaded(doc)
{
var has_login_form = false;
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// If there is a password in the form, add a "submit" listener
for(var i=0; i<doc.forms.length; i++)
{
var form = doc.forms[i];
var fields = form.getElementsByTagName("input");
for (a=0; a<fields.length; a++)
{
var field = fields[a];
if (field.getAttribute("type") == "password")
{
block_url(form.action);
old_cb = form.onsubmit;
if (old_cb)
form.removeEventListener("submit", old_cb);
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form.addEventListener("submit", on_sumbit);
if (old_cb)
form.addEventListener("submit", old_cb);
has_login_form = true;
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break;
}
}
}
/* Request can be sent to another URL... */
if (has_login_form)
block_url("<all_urls>");
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}
document_loaded(document);
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async function self_test()
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{
mkey = crypto_pbkdf2("password", "salt", 4096);
res = await encrypt_ecb(mkey, "DDDDDDDDDDDDDDDD");
reference = new Uint8Array([0xc4, 0x76, 0x01, 0x07, 0xa1, 0xc0, 0x2f, 0x22, 0xee, 0xbe, 0x60,
0xff, 0x65, 0x33, 0x5b, 0x9e]);
if (res != ab2str(reference))
{
console.log("Self test ERROR !");
}
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else
console.log("Self test OK !");
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}
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console.log("Welcome to gPass web extension v0.8.1 !");
console.log("Privacy Policy can be found at http://indefero.soutade.fr/p/gpass/source/tree/master/PrivacyPolicy.md");
console.log("");
//self_test();