Node Js Php Serialize Format
PHP Serialize() & Unserialize() Issues. To database is converted to some other way format. Since the serialize data store. Have the actual format read by PHP. Several days ago I noticed a blog post on the opsecx blog talking about exploiting a RCE (Remote Code Execution) bug in a nodejs module called node-serialize. The blog post explains pretty clearly what's wrong with the module in question but one thing that strikes me is how complex the exploitation process was with Burp. No offence to Burp - it is. Here, Node.js will parse the content to a particular JSON object and assign the same to the variable placed on the left hand side. Adding a New Element to an existing JSON Object For instance, you already have a JSON object and you're interested in modifying it by adding a new key/value pair(). The value to be serialized. Serialize() handles all types, except the resource-type.You can even serialize() arrays that contain references to itself. Circular references inside the array/object you are serializing will also be stored.
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Binser uses its own binary protocol to serialize nested objectstructures to binary stream. Some features:
How do I send a JSON file from Node.js to PHP? How can I convert a normal text file to a JSON format in Node.js? Why do you think Node.js is better than PHP?
- Primitives such as
Int8,UInt8..Int32,UInt32; - CompactNumber minimizes size of numbers;
- String type that takes care of string transmission by pre-pending string size;
- Custom object type for your own objects;
- Arrays;
- Unlimited mixing and nesting of all available type combinations;
- Documented protocol: look at /doc.
Stable usage is documented bellow.
Serialize/deserialize simple object using ObjectType
Require this:
Create your type serializer:
Serialize your hash to buffer using your type serializer:
Deserialize it back:
Serialize/deserialize built-in object
Any built-in type serializer can be used the same way as ObjectType.For example, serializing and deserializing a string:
Serialize/deserialize an array of objects using ArrayType
ArrayType can be used for serializing arrays of any type ofobjects, here is an example of string array:
ObjectType can also be used:
And any other nested combination.
The list of built-in serializers so far:
| Value | Size |
|---|---|
| types.Int8 | 8-bit signed integer. |
| types.UInt8 | 8-bit unsigned integer. |
| types.Int16 | 16-bit signed integer. |
| types.UInt16 | 16-bit unsigned integer. |
| types.Int32 | 32-bit signed integer. |
| types.UInt32 | 32-bit unsigned integer. |
| types.CompactNumber | Integer takes from 1 to 5 bytes, depending on value size. |
| types.String | Variable - length string. |
| ObjectType(config) | A sequence of other objects. |
| ArrayType() | A varied sequence of other objects. |
No floating point numbers (yet).
Pass serialized objects over streams similar to TCP
Included Reader helper can help deserializing data transmittedover protocol such as TCP. It will automatically call onReadcallback only when full object is available.
Writing to stream is easy:
Reading is a bit more involved:
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I am having problems with transactions using node.js and mysql. The problem is that my transactions do not run in isolation, even if I set the isolation level to 'serializable'.
I set up the following minimal example to exemplify my problem. I am using a single table with two collumns (id, val):
Note that I am unsing InnoDB table type because it supports transactions.
My node.js program just reads the value from the single row in table A, and increments it using an update statement. The select statement uses the FOR UPDATE modifier to obtain a lock on the row. The two sql statement are wrapped into a transaction, and I execute 10 of these transactions in a for loop:
I would expect that after running this code, the value stored in the table A is incremented by 10. However, it is just incremented by 1.
To understand what's going on I added printouts to the code. I would expect to see printouts
However I get the printouts
Node Js Php Serialize Formato
One way to fix the problem is to establish a new db connection for each transaction, but I'd prefer not to do that for performance reasons.
Can someone explain what is going on, and how I can change the above into a working example for transactions in node.js?
1 Answer
Ok, we found a solution using the node-mysql-transaction package (see code below).