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

Mateus A. Saggin · 8 de outubro de 2015

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:

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 STARTUP2015-10-05 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 SHUTDOWN2015-10-05 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 STARTUP2015-10-05 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 permitted2015-10-05 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, disconnected2015-10-05 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 permitted2015-10-05 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 permitted2015-10-05 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 permitted2015-10-05 12:00:09,305 Server-Linux proftpd[22974] Server-Linux (177.6.154.238[177.6.154.238]): FTP session closed.

proftpd.conf:

## /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 modulesInclude /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   offServerName   "Saggin FTP"ServerType   standaloneDeferWelcome   offServerIdent   offAllowForeignAddress  onMultilineRFC2228  onDefaultServer   onShowSymlinks   onTimeoutNoTransfer  1500TimeoutStalled   1500TimeoutIdle   3000DisplayLogin                    welcome.msgDisplayChdir                .message trueListOptions                 "-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    proftpdGroup    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   offTransferLog /var/log/proftpd/xferlogSystemLog   /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        offControlsMaxClients    2ControlsLog           /var/log/proftpd/controls.logControlsInterval      5ControlsSocket        /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 filesInclude /etc/proftpd/conf.d/<Global>DefaultRoot ~RequireValidShell off</Global>

Édnei Rodrigues · 8 de outubro de 2015

Estamos falando de uma rede particular ou conexão de um servidor na web ?

Mateus A. Saggin · 9 de outubro de 2015

Estamos falando de uma rede particular ou conexão de um servidor na web ?

É um servidor de arquivos local, com acesso externo ao ftp!

Édnei Rodrigues · 9 de outubro de 2015

Hum, então tu tens um Ip dinâmico publicado na internet, isso ? Olha, existe uma boa chance da operadora de telefonia estar fechando as tuas conexões FTP, já que ele utiliza a 21 e outras portas a partir da 52000 e 55000.

Aliás, esse teu servidor local possui uma conexão direta a internet ou passa por um roteador ? Quando há um roteador no meio, é preciso configurar um NAT, senão, realmente irá ocorrer essas tentativas frustradas de conexão FTP: http://www.proftpd.org/docs/howto/NAT.html

EDIT:

Esqueci de comentar, esse erro "Unable to seteuid" é normal SE você configurou o FTP Server com um usuário non-root, ou seja, subiu a aplicação com um usuário com privilégios normais no linux.