04-15-2009
10 More Discussions You Might Find Interesting
1. Programming
Hi.
I have a C program that is using the **environ pointer and I am trying to set up aliases for a system("/bin/ksh") call. This works for other environment variables but not for the aliases. Does anyone know if this can be done? Thanks ahead of time. (1 Reply)
Discussion started by: mluey61
1 Replies
2. UNIX for Dummies Questions & Answers
Is there a way to view what aliases are running on a given session? (1 Reply)
Discussion started by: BG_JrAdmin
1 Replies
3. Programming
hi,
i created some IP aliases, but the only way i can c the aliases is using ifconfgi.. is there any other system command i can use to access the aliased ip list? i tried gng to /proc/net/aliases.. but i don`t have aliases in /proc/net .
Also.. is there ayway i can retireve it using... (2 Replies)
Discussion started by: caltiger
2 Replies
4. UNIX for Dummies Questions & Answers
Can any one show me how to create an alias account that silently copies local emails to the administrator (root) using a linux cmd line or GUI?
The answer needs to be very simplly explained at this stage, as I am new to the command prompt...expecialy in linux.
thanks heaps guys
Pipa:)
I... (2 Replies)
Discussion started by: Pipa
2 Replies
5. Shell Programming and Scripting
Hello:
i have several server with own etc aliases. right now i want to combine it all into a general etc aliases in a new freebsd server. cause it consist hundred thousand of record user inside how to make a shell script to combine it or configure it.
all etc aliases record example: ... (0 Replies)
Discussion started by: peterLfs
0 Replies
6. UNIX for Dummies Questions & Answers
I work on a MAC. And i have the need to connect to various servers on a daily basis. So I use aliases in bash shell. The aliases work fine in bash shell. But they dont work with tcsh.
Can anybody clarify what might be wrong? (1 Reply)
Discussion started by: newprofile
1 Replies
7. HP-UX
Hi folks,
How can I make an alias in HP-UX? I've tried to add something just like this
bye='exit' (as example), the system accepted but when I write bye in the terminal its return with invalid command. When I make such alias in RedHat or Fedora the system accept it right there, what is the... (7 Replies)
Discussion started by: leo_ultra_leo
7 Replies
8. UNIX for Dummies Questions & Answers
Within a session we have created some aliases. How to unset all the aliases in the session or specific alias? (1 Reply)
Discussion started by: pandeesh
1 Replies
9. Solaris
Trying to figure out the best method of security for oracle user accounts. In Solaris 10 they are set as regular users but have nologin set forcing the dev's to login as themselves and then su to the oracle users.
In Solaris11 we have the option of making it a role because RBAC is enabled but... (1 Reply)
Discussion started by: os2mac
1 Replies
10. Shell Programming and Scripting
Hi,
I have set alias rm='rm -i' and i m able to see that in the list of aliases.
however, when i fire the rm command the '-i' interactive flag does not seem to kick in.
I login to a free online terminal and then i say bash to set the bash profile.
Join
Here is the output... (27 Replies)
Discussion started by: mohtashims
27 Replies
LEARN ABOUT REDHAT
filter::decrypt
decrypt(3) User Contributed Perl Documentation decrypt(3)
NAME
Filter::decrypt - template for a decrypt source filter
SYNOPSIS
use Filter::decrypt ;
DESCRIPTION
This is a sample decrypting source filter.
Although this is a fully functional source filter and it does implement a very simple decrypt algorithm, it is not intended to be used as
it is supplied. Consider it to be a template which you can combine with a proper decryption algorithm to develop your own decryption fil-
ter.
WARNING
It is important to note that a decryption filter can never provide complete security against attack. At some point the parser within Perl
needs to be able to scan the original decrypted source. That means that at some stage fragments of the source will exist in a memory buf-
fer.
Also, with the introduction of the Perl Compiler backend modules, and the B::Deparse module in particular, using a Source Filter to hide
source code is becoming an increasingly futile exercise.
The best you can hope to achieve by decrypting your Perl source using a source filter is to make it unavailable to the casual user.
Given that proviso, there are a number of things you can do to make life more difficult for the prospective cracker.
1. Strip the Perl binary to remove all symbols.
2. Build the decrypt extension using static linking. If the extension is provided as a dynamic module, there is nothing to stop someone
from linking it at run time with a modified Perl binary.
3. Do not build Perl with "-DDEBUGGING". If you do then your source can be retrieved with the "-Dp" command line option.
The sample filter contains logic to detect the "DEBUGGING" option.
4. Do not build Perl with C debugging support enabled.
5. Do not implement the decryption filter as a sub-process (like the cpp source filter). It is possible to peek into the pipe that con-
nects to the sub-process.
6. Check that the Perl Compiler isn't being used.
There is code in the BOOT: section of decrypt.xs that shows how to detect the presence of the Compiler. Make sure you include it in
your module.
Assuming you haven't taken any steps to spot when the compiler is in use and you have an encrypted Perl script called "myscript.pl",
you can get access the source code inside it using the perl Compiler backend, like this
perl -MO=Deparse myscript.pl
Note that even if you have included the BOOT: test, it is still possible to use the Deparse module to get the source code for individ-
ual subroutines.
7. Do not use the decrypt filter as-is. The algorithm used in this filter has been purposefully left simple.
If you feel that the source filtering mechanism is not secure enough you could try using the unexec/undump method. See the Perl FAQ for
further details.
AUTHOR
Paul Marquess
DATE
19th December 1995
perl v5.8.0 2003-01-27 decrypt(3)