Go to Flexlm product, and there is available an evaluation programmer's kit. Do you think flexlm programmer's kit is protected with flexlm :-DDDD??? NO, of course, not. Two of the files are provided encrypted, and of course you must begg for the key or start some reversing. A program is given to decrypt, and it nicely tells you if the code is wrong and what is the format of the code:. One of the features of the decryption program is to provide the key in a text file. Perfect, don't forget it.
Run ltrace, of course, and you'll see that when you introduce a number in the format above, the last number two or three ciphers is converted to long atol function and the error message is constructed. Dasm the file and you'll see that the value returned by the function atol is compared with 0x , and you're fired if the value is greater. Then when you introduce the right format and the last number is less than , you receive a different error message.
Looking at the new ltrace output, woowww, there's a call to sprintf that generates a string like xxxx-xxxx-xxxx-xxxx, hmmm, interesting.
Now if you put this number you got from sprintf and keep the last number untouched, you'll get a good decryption key, but not good for the specific files. Fortunately, that sprintf is the only one present in the whole log. The last task is to get the specific decryption key for flexlm files. I decided to use a funny approach and write a perl script that. Once you get the programmers kit evaluation available, let's start reading the manual, written in good html.
I'll not punish you with the gory details but the conclusion i got was, how could it be patented??? All the supposed security of the flexlm is based in keeping the methods secret.
That is absurd, anyone could get this kit and you'll see how vendors are giving away in their daemons or in their client programs the information needed to build a license generator.
The programmer's guide just gives you some clues of the encryption process, and some of the functions of Flexlm API the ones used in the source code examples provided. Now let's go to setup the whole thing and run an installation script.
Of course, i had not that vendor keys. The script starts to compile your new daemon, but at the end you receive a message that the vendor keys provided are invalid or so. If you now look at the Makefile and the software provided, this is a summary of what they supply in this kit:. The last one is really surprising at the first glance, but as the interesting routines are in the libraries it's not that easy.
Anyway it's impossible not to run lmcrypt just the second you see it. Run it and you'll get the stupid message about the vendor keys. Most of the compiled programs showed the same behaviour, so it is neccessary to:. May be any of you like the first option, i find it particularly boring.
Hey, hey, one moment, that's what Flexlm guys says about the security of their product:. No software is completely secure. FLEXlm is no exception. The following lists known points of vulnerability in FLEXlm in increasing order of difficulty to break. Globetrotter Software also maintains a list of techniques for making your implementation more secure - please contact technical support support globes. Running the debugger on the application code if it is released with unstripped executables on Unix or as a debug version on Windows.
Killing the daemons, since a majority of daemons must be up in order for anything to run, and a dead daemon is detected within the timer interval in a client. If, however, you do not use one of the built-in timers and you do not call HEARTBEAT , then your software protection could be bypassed by someone who kills the daemons each time that the application reaches the maximum license limit, as the applications would never detect that the daemon went down. Is a really great tools that allow everyone to generate a valid FlexLM license.
How can do it? Who can generate licenses? All skilled people that know something about crack and is able to hex edit some executables files. Anyone Interested, Post. I am interested in getting more information on this. Thanks abc I need this hot stuff. Would you please send it to my e-mail box given as follows?
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