is the
Internet File Transfer Protocol
server process. The server uses the
protocol
and listens at the port specified in the
service specification; see
Available options:
Select the level of authentication required. Kerberised login can not
be turned off. The default is to only allow kerberised login. Other
possibilities can be turned on by giving a string of comma separated
flags as argument to
Recognised flags are:
Allow logging in with plaintext password. The password can be a(n) OTP
or an ordinary password.
Same as
but only OTP is allowed.
Allow anonymous login.
The following combination modes exists for backwards compatibility:
Same as
Same as
Ignored.
Debugging information is written to the syslog using LOG_FTP.
Anonymous users will get a umask of
Open a socket and wait for a connection. This is mainly used for
debugging when ftpd isn't started by inetd.
Each successful and failed
session is logged using syslog with a facility of LOG_FTP.
If this option is specified twice, the retrieve (get), store (put), append,
delete, make directory, remove directory and rename operations and
their filename arguments are also logged.
Use
(a service name or number) instead of the default
A client may also request a different timeout period;
the maximum period allowed may be set to
seconds with the
option.
The default limit is 2 hours.
The inactivity timeout period is set to
seconds (the default is 15 minutes).
Set the initial umask to something else than the default 027.
In previous versions of
when a passive mode client requested a data connection to the server, the
server would use data ports in the range 1024..4999. Now, by default,
if the system supports the IP_PORTRANGE socket option, the server will
use data ports in the range 49152..65535. Specifying this option will
revert to the old behavior.
Verbose mode.
use built-in ls to list files
allowed anonymous upload filename chars
The file
can be used to disable ftp access.
If the file exists,
displays it and exits.
If the file
exists,
prints it before issuing the
message.
If the file
exists,
prints it after a successful login.
The ftp server currently supports the following ftp requests.
The case of the requests is ignored.
The following commands are specified by RFC2228.
The following non-standard or
specific commands are supported
by the
SITE request.
The following Kerberos related site commands are understood.
The remaining ftp requests specified in Internet RFC 959
are
recognized, but not implemented.
MDTM and SIZE are not specified in RFC 959, but will appear in the
next updated FTP RFC.
The ftp server will abort an active file transfer only when the
ABOR
command is preceded by a Telnet "Interrupt Process" (IP)
signal and a Telnet "Synch" signal in the command Telnet stream,
as described in Internet RFC 959.
If a
STAT
command is received during a data transfer, preceded by a Telnet IP
and Synch, transfer status will be returned.
interprets file names according to the
conventions used by
This allows users to utilize the metacharacters
authenticates users according to these rules.
If Kerberos authentication is used, the user must pass valid tickets
and the principal must be allowed to login as the remote user.
The login name must be in the password data base, and not have a null
password (if kerberos is used the password field is not checked). In
this case a password must be provided by the client before any file
operations may be performed. If the user has an OTP key, the response
from a successful USER command will include an OTP challenge. The
client may choose to respond with a PASS command giving either a
standard password or an OTP one-time password. The server will
automatically determine which type of password it has been given and
attempt to authenticate accordingly. See
for more information on OTP authentication.
The login name must not appear in the file
The user must have a standard shell returned by
If the user name appears in the file
the session's root will be changed to the user's login directory by
as for an
or
account (see next item). However, the user must still supply a password.
This feature is intended as a compromise between a fully anonymous account
and a fully privileged account. The account should also be set up as for an
anonymous account.
If the user name is
or
an
anonymous ftp account must be present in the password
file (user
In this case the user is allowed
to log in by specifying any password (by convention an email address for
the user should be used as the password).
In the last case,
takes special measures to restrict the client's access privileges.
The server performs a
to the home directory of the
user.
In order that system security is not breached, it is recommended
that the
subtree be constructed with care, consider following these guidelines
for anonymous ftp.
In general all files should be owned by
and have non-write permissions (644 or 755 depending on the kind of
file). No files should be owned or writable by
(possibly with exception for the
as specified below).
The
homedirectory should be owned by root.
The directory for external programs (such as
These programs must either be statically linked, or you must setup an
environment for dynamic linking when running chrooted.
These programs will be used if present:
Used when listing files.
When retrieving a filename that ends in
and that file isn't present,
will try to find the filename without
and compress it on the fly.
Same as compress, just with files ending in
Enables retrieval of whole directories as files ending in
Can also be combined with compression. You must use GNU Tar (or some
other that supports the
and
flags).
Will enable ``fast find'' with the
command. You must also create a
file in
If you put copies of the
and
files here, ls will be able to produce owner names rather than
numbers. Remember to remove any passwords from these files.
The file
if present, will be printed after a successful login.
Put a copy of
here.
Traditional place to put whatever you want to make public.
If you want guests to be able to upload files, create a
directory owned by
and group
with mode 730 (make sure
is member of group
The following restrictions apply to anonymous users:
Directories created will have mode 700.
Uploaded files will be created with an umask of 777, if not changed
with the
option.
These command are not accessible:
and
Filenames must start with an alpha-numeric character, and consist of
alpha-numeric characters or any of the following:
(plus),
(minus),
(equal),
(underscore),
(period), and
(comma).
FILES
Access list for users.
List of normal users who should be chroot'd.
Welcome notice.
Welcome notice after login.
Displayed and access refused.
Login access for Kerberos.
The server must run as the super-user
to create sockets with privileged port numbers. It maintains
an effective user id of the logged in user, reverting to
the super-user only when binding addresses to sockets. The
possible security holes have been extensively
scrutinized, but are possibly incomplete.
