Strace Ltrace Retrace

Information

KringleCon - Kitchen

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Solution

Took a look at the files on the terminal, saw there was a bin named make_the_candy.

Tried running the binary, output indicated that a configuration file was missing.

Executed the binary through strace, and saw that quite a few different files weren't able to be accessed, but they were stuff like /etc/ld.so.preload and everything.

Ran the binary through ltrace, only output was a missing registration.json file.

Touched registration.json then ran the file again. It worked, but this time was told that the program was unregistered so it was exiting.

Using ltrace just showed the single line that was put out on the terminal.

Ran through strace again.

Still saying unregistered. I'll try making a json format entry in the file saying that I am registered.

Same unregistered error. I ran the binary via strace again, this time with the -v flag.

Nothing new really. Running ltrace with the valid file here shows a bit more. There's some getline stuff that's repeated, maybe it's looking to compare my string to the getline string?

Ah, wait, at the end of the string it read, it says "Registration" = nil, maybe it's looking for that line?

I echoed Registration into registration.json and yeah, that worked. It matched, then searched for the next string, ':'.

I added ': ' to the first line in the file, then ran ltrace again. I can see now that it's looking for the word 'True'.

That worked, and popped the achievement while running the program!

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