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Operating Systems Linux Red Hat Does vsftpd support user subcommand? Post 303002699 by bestard on Thursday 31st of August 2017 12:21:39 AM
Old 08-31-2017
Does vsftpd support user subcommand?

I'm wondering if vsftpd supports user subcommand?
I found I can't switch user after ftp login.
Maybe someone can give me a certain answer.

I always got the message as below,

Quote:
mastest.user1{~ }% ftp mastest
Connected to mastest (172.26.80.149).
220 (vsFTPd 2.2.2)
Name (mastest:user1): user1
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> user user2
530 Can't change to another user.
Login failed.
I enabled log_ftp_protocol=YES and checked the vsftpd.log,
it didn't help much actually. The log file only showed the following message.

Quote:
Thu Aug 31 12:10:03 2017 [pid 12581] FTP response: Client "172.26.80.149", "220 (vsFTPd 2.2.2)"
Thu Aug 31 12:10:05 2017 [pid 12581] FTP command: Client "172.26.80.149", "USER user1"
Thu Aug 31 12:10:05 2017 [pid 12581] [user1] FTP response: Client "172.26.80.149", "331 Please specify the password."
Thu Aug 31 12:10:07 2017 [pid 12581] [user1] FTP command: Client "172.26.80.149", "PASS <password>"
Thu Aug 31 12:10:07 2017 [pid 12580] [user1] OK LOGIN: Client "172.26.80.149"
Thu Aug 31 12:10:07 2017 [pid 12582] [user1] FTP response: Client "172.26.80.149", "230 Login successful."
Thu Aug 31 12:10:07 2017 [pid 12582] [user1] FTP command: Client "172.26.80.149", "SYST"
Thu Aug 31 12:10:07 2017 [pid 12582] [user1] FTP response: Client "172.26.80.149", "215 UNIX Type: L8"
Thu Aug 31 12:10:16 2017 [pid 12582] [user1] FTP command: Client "172.26.80.149", "USER user2"
Thu Aug 31 12:10:16 2017 [pid 12582] [user1] FTP response: Client "172.26.80.149", "530 Can't change to another user."
I didn't change many default settings of vsftpd.conf, however, it may be worth of taking a look.

Code:
anonymous_enable=YES
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YES
xferlog_std_format=NO
ascii_upload_enable=YES
ascii_download_enable=YES
listen=YES
pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
use_localtime=YES
log_ftp_protocol=YES

How can I do to switch users after ftp login using vsftpd?
Hope someone can gives me suggestions. Thanks.
 

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PAM_LOGINUID(8) 						 Linux-PAM Manual						   PAM_LOGINUID(8)

NAME
pam_loginuid - Record user's login uid to the process attribute SYNOPSIS
pam_loginuid.so [require_auditd] DESCRIPTION
The pam_loginuid module sets the loginuid process attribute for the process that was authenticated. This is necessary for applications to be correctly audited. This PAM module should only be used for entry point applications like: login, sshd, gdm, vsftpd, crond and atd. There are probably other entry point applications besides these. You should not use it for applications like sudo or su as that defeats the purpose by changing the loginuid to the account they just switched to. OPTIONS
require_auditd This option, when given, will cause this module to query the audit daemon status and deny logins if it is not running. MODULE TYPES PROVIDED
Only the session module type is provided. RETURN VALUES
PAM_SESSION_ERR An error occurred during session management. EXAMPLES
#%PAM-1.0 auth required pam_unix.so auth required pam_nologin.so account required pam_unix.so password required pam_unix.so session required pam_unix.so session required pam_loginuid.so SEE ALSO
pam.conf(5), pam.d(5), pam(7), auditctl(8), auditd(8) AUTHOR
pam_loginuid was written by Steve Grubb <sgrubb@redhat.com> Linux-PAM Manual 06/04/2011 PAM_LOGINUID(8)
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