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Old 12-02-2009, 02:38 AM   #1
bcw
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safest command-line (not GUI) program to view apache logs?


The Apache 2.2 docs say

Quote:
[...] log files may contain information supplied directly by the client, without escaping. Therefore, it is possible for malicious clients to insert control-characters in the log files, so care must be taken in dealing with raw logs.
However, from Googling around, there seem to be no command-line (non-GUI) programs specifically for viewing possibly-malicious apache logs. Or am I wrong? Until now, I have been using less. Is that ok from a security standpoint?
 
Old 12-02-2009, 03:35 AM   #2
business_kid
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yes
 
Old 12-02-2009, 04:21 AM   #3
18Googol2
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'tail -f' seems to be better.
 
Old 12-02-2009, 04:50 AM   #4
zhjim
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tail -f will only show you the last 10 lines and all new lines coming in. But what if the information you are looking for is above the 10 lines?

(And don't be a smarass and answer with tail -n 20 -f )
 
Old 12-02-2009, 05:36 AM   #5
Web31337
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UNsafe:
Code:
php -r "include('/var/log/httpd/access.log');"
i guess all standard CLI tools would be OK.

Code:
tail -n 500 | less
is for viewing 500 last lines in a console with ability to scroll up and down.

Last edited by Web31337; 12-02-2009 at 05:39 AM.
 
Old 12-02-2009, 07:00 AM   #6
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Quote:
Originally Posted by zhjim View Post
tail -f will only show you the last 10 lines and all new lines coming in. But what if the information you are looking for is above the 10 lines?

(And don't be a smarass and answer with tail -n 20 -f )
The man pages are your friend.

I use tail as such:

tail -f -n 100 /var/log/httpd/access_log

Quote:
-f The -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the input. The -f option is ignored if the standard input is a pipe, but not if it is a FIFO.
Quote:
-n number The location is number lines.
Quote:
The default starting location is "-n 10", or the last 10 lines of the input.
 
Old 12-03-2009, 11:35 PM   #7
bcw
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thanks + a couple questions

thanks for the help, everyone.

Quote:
Originally Posted by Web31337 View Post
UNsafe:
Code:
php -r "include('/var/log/httpd/access.log');"
i guess all standard CLI tools would be OK.
yeah, i can see how that could be a problem. so basically, don't feed the logs into any executable context, right?

i was actually worried more about someone using shell control characters to trick the shell itself into executing another (arbitrary) command. but now that i think about it, unredirected output from programs the shell executes are just sent to the shell's own stdout/stderr, and have no chance to influence the shell's commands (stdin). isn't that right?
 
  


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