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crypto: handle exceptions in hmac/hash.digest

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Forced conversion of the encoding parameter to a string within
crypto.js, fixing segmentation faults in node_crypto.cc.

Fixes: https://github.com/nodejs/node/issues/9819
PR-URL: https://github.com/nodejs/node/pull/12164
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
This commit is contained in:
Tobias Nießen 2017-04-02 15:00:32 +02:00 committed by Anna Henningsen
parent cecdf7c118
commit 88351a22ed
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GPG Key ID: D8B9F5AEAE84E4CF
4 changed files with 35 additions and 14 deletions
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3
lib/crypto.js
View File

@ -100,7 +100,8 @@ Hash.prototype.update = function update(data, encoding) {
Hash.prototype.digest = function digest(outputEncoding) {
outputEncoding = outputEncoding || exports.DEFAULT_ENCODING;
return this._handle.digest(outputEncoding);
// Explicit conversion for backward compatibility.
return this._handle.digest(`${outputEncoding}`);
};

2
src/node.cc
View File

@ -1483,6 +1483,8 @@ enum encoding ParseEncoding(const char* encoding,
enum encoding ParseEncoding(Isolate* isolate,
Local<Value> encoding_v,
enum encoding default_encoding) {
CHECK(!encoding_v.IsEmpty());
if (!encoding_v->IsString())
return default_encoding;

20
src/node_crypto.cc
View File

@ -3797,9 +3797,8 @@ void Hmac::HmacDigest(const FunctionCallbackInfo<Value>& args) {
enum encoding encoding = BUFFER;
if (args.Length() >= 1) {
encoding = ParseEncoding(env->isolate(),
args[0]->ToString(env->isolate()),
BUFFER);
CHECK(args[0]->IsString());
encoding = ParseEncoding(env->isolate(), args[0], BUFFER);
}
unsigned char* md_value = nullptr;
@ -3921,9 +3920,8 @@ void Hash::HashDigest(const FunctionCallbackInfo<Value>& args) {
enum encoding encoding = BUFFER;
if (args.Length() >= 1) {
encoding = ParseEncoding(env->isolate(),
args[0]->ToString(env->isolate()),
BUFFER);
CHECK(args[0]->IsString());
encoding = ParseEncoding(env->isolate(), args[0], BUFFER);
}
unsigned char md_value[EVP_MAX_MD_SIZE];
@ -4201,10 +4199,8 @@ void Sign::SignFinal(const FunctionCallbackInfo<Value>& args) {
unsigned int len = args.Length();
enum encoding encoding = BUFFER;
if (len >= 2 && args[1]->IsString()) {
encoding = ParseEncoding(env->isolate(),
args[1]->ToString(env->isolate()),
BUFFER);
if (len >= 2) {
encoding = ParseEncoding(env->isolate(), args[1], BUFFER);
}
node::Utf8Value passphrase(env->isolate(), args[2]);
@ -4452,9 +4448,7 @@ void Verify::VerifyFinal(const FunctionCallbackInfo<Value>& args) {
enum encoding encoding = UTF8;
if (args.Length() >= 3) {
encoding = ParseEncoding(env->isolate(),
args[2]->ToString(env->isolate()),
UTF8);
encoding = ParseEncoding(env->isolate(), args[2], UTF8);
}
ssize_t hlen = StringBytes::Size(env->isolate(), args[1], encoding);

24
test/parallel/test-regress-GH-9819.js Normal file
View File

@ -0,0 +1,24 @@
'use strict';
const common = require('../common');
const assert = require('assert');
const execFile = require('child_process').execFile;
if (!common.hasCrypto) {
common.skip('missing crypto');
return;
}
const setup = 'const enc = { toString: () => { throw new Error("xyz"); } };';
const scripts = [
'crypto.createHash("sha256").digest(enc)',
'crypto.createHmac("sha256", "msg").digest(enc)'
];
scripts.forEach((script) => {
const node = process.execPath;
const code = setup + ';' + script;
execFile(node, [ '-e', code ], common.mustCall((err, stdout, stderr) => {
assert(stderr.includes('Error: xyz'), 'digest crashes');
}));
});