john-dev - Trying to build john without *_fmt

Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Sat, 5 Jan 2013 11:48:38 +0100
From: Frank Dittrich <frank_dittrich@...mail.com>
To: john-dev@...ts.openwall.com
Subject: Trying to build john without *_fmt_plug.c

I wanted to test whether building a binary without support for any
unnecessary formats would result in better performance.
So I first got the latest git changes (including 018ddb99).
Then I uncommented HAVE_KRB5, HAVE_NSS and HAVE_GMP in Makefile.
Then I did

(unstable-jumbo)src $ make clean > /dev/null
(unstable-jumbo)src $ mkdir plugins
(unstable-jumbo)src $ mv *_fmt_plug.c plugins/
(unstable-jumbo)src $ make linux-x86-native > /dev/null
make[1]: *** No rule to make target `*_fmt_plug.c', needed by
`fmt_externs.h'.  Stop.
make: *** [linux-x86-native] Error 2

(I removed the irrelevant rawSHA1_ng_fmt.c warning about not using
sse4.1 from the output.)

So, I need to provide at least some *_fmt_plug.c.

(unstable-jumbo)src $ touch empty_fmt_plug.c
(unstable-jumbo)src $ make clean > /dev/null
(unstable-jumbo)src $ make linux-x86-native > /dev/null
[...]
x86-sse.o: In function `nt_crypt_all_sse2':
(.text+0xb758): undefined reference to `nt_buffer1x'
x86-sse.o: In function `nt_crypt_all_sse2':
(.text+0xb7a9): undefined reference to `nt_buffer4x'
[...]
x86-sse.o: In function `nt_crypt_all_sse2':
(.text+0xbf82): undefined reference to `output4x'
x86-sse.o: In function `nt_crypt_all_sse2':
(.text+0xbf87): undefined reference to `output1x'
[...]
collect2: ld returned 1 exit status
make[1]: *** [../run/john] Error 1

All these variables are defined in NT_fmt_plug.c

Next attempt:
(unstable-jumbo)src $ mv plugins/NT_fmt_plug.c .
(unstable-jumbo)src $ make clean > /dev/null
(unstable-jumbo)src $ make linux-x86-native > /dev/null
cracker.o: In function `crk_process_guess':
cracker.c:(.text+0x6db): undefined reference to `mediawiki_fix_salt'
inc.o: In function `do_incremental_crack':
inc.c:(.text+0x2c36): undefined reference to `fmt_NETLM'
inc.c:(.text+0x2c41): undefined reference to `fmt_NETHALFLM'
loader.o: In function `ldr_load_pot_line':
loader.c:(.text+0x171f): undefined reference to `mediawiki_fix_salt'
collect2: ld returned 1 exit status
make[1]: *** [../run/john] Error 1
make: *** [linux-x86-native] Error 2

So, cracker.c and loader.c need mediawiki_fix_salt, and inc.c needs
fmt_NETLM and fmt_NETHALFLM.

(unstable-jumbo)src $ cd plugins/
(unstable-jumbo)plugins $ mv mediawiki_fmt_plug.c NETLM_fmt_plug.c
NETSPLITLM_fmt_plug.c ..
(unstable-jumbo)plugins $ cd ..
(unstable-jumbo)src $ make clean > /dev/null
(unstable-jumbo)src $ make linux-x86-native > /dev/null

This finally worked.

I managed to get rid of more than 100 plugin formats.
But currently, 4 plugin formats are required to build john:

(unstable-jumbo)src $ ls plugins/|wc -l
102
(unstable-jumbo)src $ cat fmt_registers.h
john_register_one(&fmt_NETHALFLM);
john_register_one(&fmt_NETLM);
john_register_one(&fmt_NT);
john_register_one(&fmt_mediawiki);

It would be nice if you could build john without any plugin format.
But I don't thin I'll find time for any fixes over the weekend.

Frank
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.