[ProFTPd] RELINQUISH PRIVS: unable to seteuid... - Usuários Desconectados

[mateus_zorba]

Bom dia,


Estou com um problema no meu servidor de FTP. Ao tentar enviar arquivos meus clientes são desconectados automaticamente do servidor, as vezes até mesmo com dificuldades para logar com o seguinte erro no FileZilla: 


Status:        Connection attempt failed with "ECONNREFUSED - Connection refused by server".
Error:          Could not connect to server


Não sei se isso tem alguma relação, ou pode ajudar, quando eu tento conectar via RDC para gerencia meu servidor, ele me retorna um erro para verificar a conexão com a internet do meu computador e a do servidor o qual estou tentando conectar. Após sucessivas tentativas de reconectar ao servidor ele loga normal, e após um tempo cai a conexão com o RDC também.


Segue os arquivos do proftpd.


proftpd.log:

Código Selecionar Expandir


2015-10-04 06:25:05,106 Server-Linux proftpd[21885] Server-Linux: ProFTPD 1.3.5rc3 (devel) (built Fri Dec 20 2013 18:05:41 UTC) standalone mode STARTUP
2015-10-05 00:00:17,252 Server-Linux proftpd[21885] Server-Linux: ProFTPD killed (signal 15)
2015-10-05 00:00:17,253 Server-Linux proftpd[21885] Server-Linux: ProFTPD 1.3.5rc3 standalone mode SHUTDOWN
2015-10-05 00:01:06,405 Server-Linux proftpd[1908] Server-Linux: ProFTPD 1.3.5rc3 (devel) (built Fri Dec 20 2013 18:05:41 UTC) standalone mode STARTUP
2015-10-05 08:50:07,555 Server-Linux proftpd[22974] Server-Linux (177.6.154.238[177.6.154.238]): FTP session opened.
2015-10-05 11:50:08,174 Server-Linux proftpd[22974] Server-Linux (177.6.154.238[177.6.154.238]): Preparing to chroot to directory '/srv/ftp/Thalyane Veiga'
2015-10-05 11:50:08,203 Server-Linux proftpd[22974] Server-Linux (177.6.154.238[177.6.154.238]): USER thalyaneveiga: Login successful.
2015-10-05 08:50:26,023 Server-Linux proftpd[23022] Server-Linux (177.6.154.238[177.6.154.238]): FTP session opened.
2015-10-05 11:50:26,405 Server-Linux proftpd[23022] Server-Linux (177.6.154.238[177.6.154.238]): Preparing to chroot to directory '/srv/ftp/Thalyane Veiga'
2015-10-05 11:50:26,405 Server-Linux proftpd[23022] Server-Linux (177.6.154.238[177.6.154.238]): USER thalyaneveiga: Login successful.
2015-10-05 11:52:01,291 Server-Linux proftpd[23022] Server-Linux (177.6.154.238[177.6.154.238]): RELINQUISH PRIVS: unable to seteuid(PR_ROOT_UID): Operation not permitted
2015-10-05 11:52:01,291 Server-Linux proftpd[23022] Server-Linux (177.6.154.238[177.6.154.238]): FTP session closed.
2015-10-05 12:00:09,304 Server-Linux proftpd[22974] Server-Linux (177.6.154.238[177.6.154.238]): FTP no transfer timeout, disconnected
2015-10-05 12:00:09,304 Server-Linux proftpd[22974] Server-Linux (177.6.154.238[177.6.154.238]): ROOT PRIVS: unable to seteuid(): Operation not permitted
2015-10-05 12:00:09,304 Server-Linux proftpd[22974] Server-Linux (177.6.154.238[177.6.154.238]): ROOT PRIVS: unable to setegid(): Operation not permitted
2015-10-05 12:00:09,305 Server-Linux proftpd[22974] Server-Linux (177.6.154.238[177.6.154.238]): RELINQUISH PRIVS: unable to seteuid(PR_ROOT_UID): Operation not permitted
2015-10-05 12:00:09,305 Server-Linux proftpd[22974] Server-Linux (177.6.154.238[177.6.154.238]): FTP session closed.



proftpd.conf:

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#
# /etc/proftpd/proftpd.conf -- This is a basic ProFTPD configuration file.
# To really apply changes, reload proftpd after modifications, if
# it runs in daemon mode. It is not required in inetd/xinetd mode.
#


# Includes DSO modules
Include /etc/proftpd/modules.conf


# Set off to disable IPv6 support which is annoying on IPv4 only boxes.
UseIPv6 off
# If set on you can experience a longer connection delay in many cases.
IdentLookups off


ServerName "Saggin FTP"
ServerType standalone
DeferWelcome off
ServerIdent off
AllowForeignAddress on


MultilineRFC2228 on
DefaultServer on
ShowSymlinks on


TimeoutNoTransfer 1500
TimeoutStalled 1500
TimeoutIdle 3000


DisplayLogin                    welcome.msg
DisplayChdir                .message true
ListOptions                "-l"


DenyFilter \*.*/


# Use this to jail all users in their homes
# DefaultRoot ~


# Users require a valid shell listed in /etc/shells to login.
# Use this directive to release that constrain.
# RequireValidShell off


# Port 21 is the standard FTP port.
Port 21


# In some cases you have to specify passive ports range to by-pass
# firewall limitations. Ephemeral ports can be used for that, but
# feel free to use a more narrow range.
PassivePorts                  52000 55000


# If your host was NATted, this option is useful in order to
# allow passive tranfers to work. You have to use your public
# address and opening the passive ports used on your firewall as well.
# MasqueradeAddress 1.2.3.4


# This is useful for masquerading address with dynamic IPs:
# refresh any configured MasqueradeAddress directives every 8 hours
<IfModule mod_dynmasq.c>
# DynMasqRefresh 28800
</IfModule>


# To prevent DoS attacks, set the maximum number of child processes
# to 30.  If you need to allow more than 30 concurrent connections
# at once, simply increase this value.  Note that this ONLY works
# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd)
MaxInstances 37


# Set the user and group that the server normally runs at.
User proftpd
Group nogroup


# Umask 022 is a good standard umask to prevent new files and dirs
# (second parm) from being group and world writable.
Umask 111  000
# Normally, we want files to be overwriteable.
AllowOverwrite on


# Uncomment this if you are using NIS or LDAP via NSS to retrieve passwords:
# PersistentPasswd off


# This is required to use both PAM-based authentication and local passwords
# AuthOrder mod_auth_pam.c* mod_auth_unix.c


# Be warned: use of this directive impacts CPU average load!
# Uncomment this if you like to see progress and transfer rate with ftpwho
# in downloads. That is not needed for uploads rates.
#
# UseSendFile off


TransferLog /var/log/proftpd/xferlog
SystemLog   /var/log/proftpd/proftpd.log


# Logging onto /var/log/lastlog is enabled but set to off by default
#UseLastlog on


# In order to keep log file dates consistent after chroot, use timezone info
# from /etc/localtime.  If this is not set, and proftpd is configured to
# chroot (e.g. DefaultRoot or <Anonymous>), it will use the non-daylight
# savings timezone regardless of whether DST is in effect.
#SetEnv TZ :/etc/localtime


<IfModule mod_quotatab.c>
QuotaEngine off
</IfModule>


<IfModule mod_ratio.c>
Ratios off
</IfModule>




# Delay engine reduces impact of the so-called Timing Attack described in
# http://www.securityfocus.com/bid/11430/discuss
# It is on by default.
<IfModule mod_delay.c>
DelayEngine on
</IfModule>


<IfModule mod_ctrls.c>
ControlsEngine        off
ControlsMaxClients    2
ControlsLog           /var/log/proftpd/controls.log
ControlsInterval      5
ControlsSocket        /var/run/proftpd/proftpd.sock
</IfModule>


<IfModule mod_ctrls_admin.c>
AdminControlsEngine off
</IfModule>


#
# Alternative authentication frameworks
#
#Include /etc/proftpd/ldap.conf
#Include /etc/proftpd/sql.conf


#
# This is used for FTPS connections
#
#Include /etc/proftpd/tls.conf


#
# Useful to keep VirtualHost/VirtualRoot directives separated
#
#Include /etc/proftpd/virtuals.conf


# A basic anonymous configuration, no upload directories.


# <Anonymous ~ftp>
#   User ftp
#   Group nogroup
#   # We want clients to be able to login with "anonymous" as well as "ftp"
#   UserAlias anonymous ftp
#   # Cosmetic changes, all files belongs to ftp user
#   DirFakeUser on ftp
#   DirFakeGroup on ftp
#
#   RequireValidShell off
#
#   # Limit the maximum number of anonymous logins
#   MaxClients 10
#
#   # We want 'welcome.msg' displayed at login, and '.message' displayed
#   # in each newly chdired directory.
#   DisplayLogin welcome.msg
#   DisplayChdir .message
#
#   # Limit WRITE everywhere in the anonymous chroot
#   <Directory *>
#     <Limit WRITE>
#       DenyAll
#     </Limit>
#   </Directory>
#
#   # Uncomment this if you're brave.
#   # <Directory incoming>
#   #   # Umask 022 is a good standard umask to prevent new files and dirs
#   #   # (second parm) from being group and world writable.
#   #   Umask 022  022
#   #            <Limit READ WRITE>
#   #            DenyAll
#   #            </Limit>
#   #            <Limit STOR>
#   #            AllowAll
#   #            </Limit>
#   # </Directory>
#
# </Anonymous>


# Include other custom configuration files
Include /etc/proftpd/conf.d/
<Global>
DefaultRoot ~
RequireValidShell off


</Global>


[zekkerj]

Preparing to chroot to directory '/srv/ftp/Thalyane Veiga'
(...)
ROOT PRIVS: unable to seteuid(): Operation not permitted

Teu problema me parece ser a combinação de tentar entrar em modo chroot, com o fato de não estar rodando como super-usuário antes.

[mateus_zorba]

Preparing to chroot to directory '/srv/ftp/Thalyane Veiga'
(...)
ROOT PRIVS: unable to seteuid(): Operation not permitted

Teu problema me parece ser a combinação de tentar entrar em modo chroot, com o fato de não estar rodando como super-usuário antes.

Boa tarde zekkerj,

Obrigado pela sua reposta. Será que você poderia me esclarecer um pouco melhor, ou como poderia resolver. Não sou expert na área, mas tenho um bom conehcimento e uma noção boa.

Obrigado,
Att.

[zekkerj]

Então... vc configurou seu proftpd para rodar em modo "Chroot Jail", ou seja, ele só consegue ver um pedaço da sua árvore de diretórios. Só que pra que esse modo de trabalho seja possível, o proftpd tem que estar rodando como super-usuário, e não com o usuário comum (ftp ou proftp, ou coisa parecida). Tem que ver no manual de configuração dele quais são as opções que devem ser ativadas pra que isso funcione.

[mateus_zorba]

Então... vc configurou seu proftpd para rodar em modo "Chroot Jail", ou seja, ele só consegue ver um pedaço da sua árvore de diretórios. Só que pra que esse modo de trabalho seja possível, o proftpd tem que estar rodando como super-usuário, e não com o usuário comum (ftp ou proftp, ou coisa parecida). Tem que ver no manual de configuração dele quais são as opções que devem ser ativadas pra que isso funcione.

Entendi, estou em viagem agora, mas assim que possível vou pegar o man do proftpd e dar uma olhada ver se resolvo isso. Se nao conseguir volto aqui para solicitar alguma ajudinha que apareça. De toda forma volto para postar a solução caso alguém precise. Obrigado pela ajuda zekkerj