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Truss and the FTP command

 
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# 1  
Old 02-01-2005
Truss and the FTP command
I have been trying to perform the following command without success

truss -feo truss.out ftp -nvd < ftpcmds.txt
The error I am getting is
"truss: cannot trace set_id or unreadable object file /usr/bin/ftp"

I have tested the file that contains the ftp commands and it works fine with
ftp -nvd < ftpcmds.txt

However, I do need to use this in conjuntion with the truss command.

Can anyone help?
# 2  
Old 02-01-2005
It looks like ftp has the setuid bit turned on. Probably to be able to read files.
Depending on how your system is set up, you may have to copy the ftp image to another directory, log in as root, clear the setuid bit, then run truss.

That's my best guess from what I see here.
# 3  
Old 02-01-2005
ftp may simply be unreadable. Do an "ls -l /usr/bin/ftp". If you run truss as root it should work without changing the permissions on ftp.
# 4  
Old 02-01-2005
I had a version of tusc (HPUX 10 version of truss) that would never run a file with the setuid bit on. My current version does not have that problem. Or feature.
# 5  
Old 02-01-2005
Quote:
Originally Posted by jim mcnamara
I had a version of tusc (HPUX 10 version of truss) that would never run a file with the setuid bit on. My current version does not have that problem. Or feature.
debuggers should refuse to run on programs when the effective uid is different than the real uid unless the real uid is root. They should also refuse to run on an unreadable text file. Failure to enforce these restrictions is a security problem. I thought that the ptrace system call itself enforced these restrictions but I only find:
Quote:
[EPERM] The specified process cannot be attached for tracing.
[EPERM] The process pid is already being traced or pid refers to the calling process itself.
with no precise definition of why a process might not be attachable.
# 6  
Old 02-02-2005
Truss and FTP
Hi,
Thanks for your assistance.
FTP is readable.
However, the command works fine only when I am logged on as Root.

I am looking into the SETUID now.
 
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