Portanto, tenho lutado muito nos últimos dias tentando obter uma instância chrooted do FTPES do vsftpd configurada no Red Hat 7.3.
O objetivo é fazer com que os usuários externos façam login apenas em seus respectivos diretórios para fazer o download apenas dos arquivos. Haverá cerca de 50 usuários de ftp.
vsftpd version 3.0.2, Red-Hat 7.3
Para começar, aqui está o meu vsftpd conf:
# The default compiled in settings are fairly paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
# Please see vsftpd.conf.5 for all compiled in defaults.
#
# READ THIS: This example file is NOT an exhaustive list of vsftpd options.
# Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
# capabilities.
#
# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
anonymous_enable=NO
#
# Uncomment this to allow local users to log in.
# When SELinux is enforcing check for SE bool ftp_home_dir
local_enable=YES
#
# Uncomment this to enable any form of FTP write command.
write_enable=NO
#
# Default umask for local users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
local_umask=022
#
# Uncomment this to allow the anonymous FTP user to upload files. This only
# has an effect if the above global write enable is activated. Also, you will
# obviously need to create a directory writable by the FTP user.
# When SELinux is enforcing check for SE bool allow_ftpd_anon_write, allow_ftpd_full_access
#anon_upload_enable=YES
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
#anon_mkdir_write_enable=YES
#
# Activate directory messages - messages given to remote users when they
# go into a certain directory.
dirmessage_enable=YES
# Activate logging of uploads/downloads.
xferlog_enable=YES
dual_log_enable=YES
vsftpd_log_file=/var/log/vsftpd/vsftpd.log
# Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=YES
#
# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user. Note! Using "root" for uploaded files is not
# recommended!
#chown_uploads=YES
#chown_username=whoever
#
# You may override where the log file goes if you like. The default is shown
# below.
xferlog_file=/var/log/vsftpd/xferlog.log
#
# If you want, you can have your log file in standard ftpd xferlog format.
# Note that the default log file location is /var/log/xferlog in this case.
xferlog_std_format=YES
#
# You may change the default value for timing out an idle session.
#idle_session_timeout=600
#
# You may change the default value for timing out a data connection.
#data_connection_timeout=120
#
# It is recommended that you define on your system a unique user which the
# ftp server can use as a totally isolated and unprivileged user.
#nopriv_user=ftpsecure
#
# Enable this and the server will recognise asynchronous ABOR requests. Not
# recommended for security (the code is non-trivial). Not enabling it,
# however, may confuse older FTP clients.
#async_abor_enable=YES
#
# By default the server will pretend to allow ASCII mode but in fact ignore
# the request. Turn on the below options to have the server actually do ASCII
# mangling on files when in ASCII mode.
# Beware that on some FTP servers, ASCII support allows a denial of service
# attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd
# predicted this attack and has always been safe, reporting the size of the
# raw file.
# ASCII mangling is a horrible feature of the protocol.
#ascii_upload_enable=YES
#ascii_download_enable=YES
#
# You may fully customise the login banner string:
ftpd_banner=TEST
#
# You may specify a file of disallowed anonymous e-mail addresses. Apparently
# useful for combatting certain DoS attacks.
#deny_email_enable=YES
# (default follows)
#banned_email_file=/etc/vsftpd/banned_emails
#
# You may specify an explicit list of local users to chroot() to their home
# directory. If chroot_local_user is YES, then this list becomes a list of
# users to NOT chroot().
# (Warning! chroot'ing can be very dangerous. If using chroot, make sure that
# the user does not have write access to the top level directory within the
# chroot)
chroot_local_user=YES
passwd_chroot_enable=YES
local_root=/data/ftp/pub/somedir
hide_ids=YES
# (default follows)
#chroot_list_file=/etc/vsftpd/chroot_list
#
# You may activate the "-R" option to the builtin ls. This is disabled by
# default to avoid remote users being able to cause excessive I/O on large
# sites. However, some broken FTP clients such as "ncftp" and "mirror" assume
# the presence of the "-R" option, so there is a strong case for enabling it.
#ls_recurse_enable=YES
#
# When "listen" directive is enabled, vsftpd runs in standalone mode and
# listens on IPv4 sockets. This directive cannot be used in conjunction
# with the listen_ipv6 directive.
listen=YES
#
# This directive enables listening on IPv6 sockets. By default, listening
# on the IPv6 "any" address (::) will accept connections from both IPv6
# and IPv4 clients. It is not necessary to listen on *both* IPv4 and IPv6
# sockets. If you want that (perhaps because you want to listen on specific
# addresses) then you must run two copies of vsftpd with two configuration
# files.
# Make sure, that one of the listen options is commented !!
#listen_ipv6=NO
pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
# Enable Passive Mode for ftp server.
pasv_enable=YES
pasv_min_port=10090
pasv_max_port=10100
# Enable TLS / SSL Connections
ssl_enable=YES
# To Allow anonymous users to use SSL
allow_anon_ssl=NO
# To force local users to use SSL
force_local_data_ssl=YES
force_local_logins_ssl=YES
# The following option depend on the authentication method you require.
ssl_ciphers=HIGH
ssl_tlsv1=YES
ssl_sslv2=NO
ssl_sslv3=NO
# These values must adjust according to your environemnt.
rsa_cert_file=/etc/pki/tls/certs/<removed_full_name>.pem
rsa_private_key_file=/etc/pki/tls/private/<removed_full_name>.key
require_ssl_reuse=NO
Atualmente, configuro os diretórios de usuários assim:
/data/ftp/pub/somedir/./ftpuser1
/data/ftp/pub/somedir/./ftpuser2
This works and chroots me into /ftpuser1 however I am unable to view any files or other directories & I am able to traverse down one directory into the /data/ftp/pub/SOMEDIR which I do not want, because users will be able to see how many other ftpuserxx there are.
Eu também tentei:
/data/ftp/pub/somedir/ftpuser3/./
<this fails with error code: Error: GnuTLS error -15: An unexpected TLS packet was received. Error:Could not connect to server>
As permissões nos diretórios ftp são as seguintes: dentro de / data / ftp / pub:
drwxr-xr-x. 5 root root 48 Jan 12 09:03 somedir
dentro de / data / ftp:
drwxr-xr-x. 3 root root 21 Jan 10 16:42 pub
dentro de / data:
drwxr-xr-x. 3 root root 17 Jan 10 16:42 ftp
dentro da pasta somedir:
drwx------. 3 ftpuser1 ftpuser 108 Jan 11 16:23 ftpuser1
drwx------. 2 ftpuser2 ftpuser 78 Jan 12 09:04 ftpuser2
drwx------. 3 ftpuser3 ftpuser 92 Jan 12 09:03 ftpuser3
dentro da pasta ftpuser1:
drwx------. 2 ftpuser1 ftpuser 23 Jan 11 16:23 test_instructions
-rwx------. 1 ftpuser1 ftpuser 0 Jan 11 16:23 test.txt