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Most helpful customer reviews
56 of 61 people found the following review helpful.
Not for an expert, not for a beginner
By insomniac
TL;DR - go directly to the conclusion.
This book is really weird. It shows since the beginning its nature, as stated by the book itself: a cookbook. A set of recipes to do something effectively, one would expect. It is, instead, a series of examples of how replicating some pretty old attack in a pretty bad manner. The reasons why I say this?
- the code is bad:
- it looks like "the Python antipattern cookbook", that is "how not to code in Python" (too long list of examples here, but some: exception handling generally absent and when present it's a "catch-all", namespace pollution, old-style classes)
- it completely ignores best practices, code reuse, multithreading, isolation, synchronization, good design
- the attacks are very old:
- everything you learn in this book is pointless nowadays
- the rationale and explanations are generally absent:
- it doesn't explain why something is done in that way: it just goes "we do this, and this, and this, et voil�!". The consequence is that it's useless for a beginner since he can't learn anything new, and it's useless for an expert, since it's too basic to be useful
- there's no troubleshooting at all: what if something doesn't work out of the box? Users reported non-working scripts from the book
- it doesn't explain why we're choosing a library instead of another, a single statement "it's faster", "it's more reliable", "I like it" is better than nothing
- it doesn't explain how those libraries work, what can be really done, how to exploit their potential for our use
- every example is self-contained and can't be easily reused: it doesn't help building an arsenal
- it does poor use of the plethora of Python-based security tools out there
- attacks are not optimized for parallelism: the Python has the GIL, that renders pretty useless the threading module. But also, it has the multiprocessing approach that can circumvent this problem. Unfortunately the author never uses or mention it
Someone may say that "security people" shouldn't waste time with programming practices, but that's wrong. Security researchers have always been good programmers by need, and still are. If the code is bad and the attacks are less than practical, what's the point?
On the other hand, a good point: the Forensics Investigation chapter is pretty good. Also, if I understood correctly, it has been written by a different contributing author.
== Conclusion:
I wouldn't buy it again, and, no, I am not happy of the money I spent. It wasn't even cheap.
0 of 0 people found the following review helpful.
Not perfect, but still a must read.
By Kindle Customer
Not perfect, but still a "must read." The content is already a little dated and some examples are simplistic, but the majority of real-word hacks involve simple things and dumb stuff. This book is a great starting point. I'm hoping there will be a second edition.
179 of 192 people found the following review helpful.
Violent Python Libraries
By TurboBorland
Violent python is an introductory level book on python with a introductory look at security concepts in general. It is great for those who are new to the language and would like example use cases of simplistic security tools, but not for those who want to understand Python, deeply understand the security concepts covered, or using python for reliable tools.
Problems I had:
1.) This book is about python libraries and interacting with them and other programs. It is not about understanding the attack and implementing them in Python. Sure, some may be required for ease to the beginner when it comes to forensics, communicating with ssh, or integrating with other tools for complex protocols like SMB, but anything else is really not fair to those who may not be able to use the library, who have problems and need to understand why, or those who want to understand what is happening on a lower level. Examples:
1a.) Use ftplib for your ftp bruteforcer.
1b.) Use zipfile to crack zip archives.
1c.) Use os to send metasploit exploit code (your own 'conficker')/os to use msfpayload to bypass a/v.
1d.) Use smtplib to communicate with smtp (regardless of the functions being ironically similiar to the real commands).
The problem with this is it doesn't teach you how these libraries work. For example, one should show the person how to interact with FTP with the sockets library, what to send, what to look for, and then show them the easy libraries. As previosly stated, it also doesn't prepare them for issues (like programs that don't like complying with rfc standards).
2.) More exception handling. The socket code is not helpfully handled on all stages of attempted connection. Debugging why something isn't working for a beginner is going to be a nightmare especially later on for point 3. He talks about exception handling, but integrates it very loosely. This plays into many people's issues on other sites with the author's script quality. Good exception handling or even print statements should be covered if you're going to be teaching a new person and something breaks on them.
3.) Thread safety doesn't seem to be an issue that's handled. Because of the GIL (global interpreter lock) threads can not expand cores when using cython (the default python interpreter). This means that you have a thread limit on the process/core and this causes problems for speed and for thread handling when you start really using it. When doing a portscan or communicating to a server with threads, the host or port may go down, you may get blocked, etc. and the thread can die. It becomes a huge problem especially because it doesn't maintain state and doesn't resend a failed attempt. But violent python libraries strike again and you'll just integrate nmap scans for your portscans anyway.
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Well, with the issues out of the way, let's talk about what this book does well. I do believe that the forensics sections of this book are good. The descriptions are more in-depth and I've always seen forensics as "what do I have in my toolbag", which makes sense when bringing in all of the thirdparty libraries for the forensics sections. Then it gets down to using scapy. Once he starts using scapy, everything is much more informative due to the level and quality of information. No longer are you using a library for....logging into an ftp server, but you start crafting and analyzing packets raw packets. This allows a much needed understanding of what is happening in the script and with the packets/network at the same time.
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