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Operating Systems Linux Red Hat Does vsftpd support user subcommand? Post 303002861 by bestard on Monday 4th of September 2017 12:04:41 AM
Old 09-04-2017
Quote:
Originally Posted by Corona688
Do not mess with PAM unless you are in easy driving distance of the system, have a rescue CD and the technical know-how to fix it by hand. Even then, give it a couple of second thoughts. The risks of altering PAM are very high. You can easily render your system unbootable, un-login-able, or open security holes you could only discover by accident (or intentional intrusion).

Why do you need to change users after an FTP login? Why not login as the user you wanted to login as in the first place?

Why do you need to use FTP at all?

Explain your problem in more detail and we can probably find better solutions.
Thank you for reminding.
I don't have intention to alter or replace PAM actually,
I'm just thinking if any variables can be added/adjusted into vsftpd PAM file to solve USER command issue. Altering the PAM file is not necessary for me.
If there are other ways to solve the issue, that would be fine.

We have some in-house utilities worked among different domains.
Those utilities are served to users.
A user can run programs and upload data to a partially public account.

The program generates a ftp script including changing the user's account
to the public account "design" and then run the script to upload data.
The program designer uses .netrc to avoid inputing passwords
It's a little bit complicated to explain the designer's needs in detail.
I got a part of the designer's codes as below,

Code:
# upload database to the "design" account
# the "design" account is an public account with 755 permission.
if(!(-e $HOME/.netrc)) then
        echo machine host login design password password >> $HOME/.netrc
        chmod 600 $HOME/.netrc
else if("`grep design $HOME/.netrc`" == "") then
        echo machine host login design password password >> $HOME/.netrc
endif

echo ftp host \> ftp.log \<\<\! > cts.ftp
echo user design password >> cts.ftp
echo mkdir $argv[1] >> cts.ftp
echo cd $argv[1] >> cts.ftp
echo bi >> cts.ftp
echo put ${cid}_cts.zip >> cts.ftp
echo bye >> cts.ftp
echo \! >> cts.ftp

chmod 700 cts.ftp
cts.ftp
rm -f cts.ftp

I know it's an outdated coding style since using .netrc is risky and unsafe. There are some history backgrounds out there.
We just focus on solving the issue.

Any suggestion would be appreciated. Thanks.

Last edited by bestard; 09-04-2017 at 03:02 AM..
 

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netrc(4)							   File Formats 							  netrc(4)

NAME
netrc - file for ftp remote login data DESCRIPTION
The .netrc file contains data for logging in to a remote host over the network for file transfers by ftp(1). This file resides in the user's home directory on the machine initiating the file transfer. Its permissions should be set to disallow read access by group and oth- ers. See chmod(1). Tokens can be separated by SPACE, TAB, or NEWLINE characters. The following tokens are supported: account string Supply an additional account password. If this token is present, the auto-login process supplies the specified string if the remote server requires an additional account password. If the remote server does not require an additional account password, the auto-login process initiates an ACCT command. default Same as machine name, except that default matches any name. There can be only one default token, and it must be after all machine tokens. The default token is normally used as follows: default login anonymous password user@site Such an entry gives the user automatic anonymous ftp login to machines not specified in .netrc. login name Identify a user on the remote machine. If this token is present, the auto-login process initiates a login using the specified name. machine name Identify a remote machine name. The auto-login process searches the .netrc file for a machine token that matches the remote machine specified on the ftp command line or as an open command argument. Once a match is made, the subsequent .netrc tokens are processed, stopping when the EOF is reached or another machine token is encountered. macdef name Define a macro. This token functions the same as ftp macdef. A macro is defined with the specified name; its contents begin with the next .netrc line and continue until a null line (consecutive NEWLINE characters) is encountered. If a macro named init is defined, it is automatically executed as the last step in the auto-login process. password string Supply a password. If this token is present, the auto-login process supplies the specified string if the remote server requires a password as part of the login process. If this token is present in the .netrc file, ftp aborts the auto-login process if the .netrc is readable by anyone besides the user. skipsyst Skip the SYST command that is sent by default to all remote servers upon connection. The system command is what enables the automatic use of binary mode rather than the protocol default ascii mode. As some older servers cannot handle the ftp command, this directive is provided to allow inter-operability with these servers. EXAMPLES
Example 1 A Sample .netrc File A .netrc file containing the following line: machine ray login demo password mypassword allows an autologin to the machine ray using the login name demo with password mypassword. FILES
~/.netrc SEE ALSO
chmod(1), ftp(1), in.ftpd(1M) SunOS 5.11 25 Aug 2006 netrc(4)
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