ftpd(8) 						      System Manager's Manual							   ftpd(8)

NAME

       ftpd - Describes File Transfer Protocol server daemon, including anonymous service

SYNOPSIS

       ftpd [-dl] [-ttimeout] [-Tmaxtimeout]

FLAGS

       Debugging  information  is  sent  to the syslogd daemon (see syslogd(8)).  Each FTP session, as well as additional information, such as the
       file name retrieved or stored, the number of bytes, and the attempted logins that failed, is sent to the syslogd daemon	(see  syslogd(8)).
       The inactivity time-out period will be set to time-out seconds.	The maximum timeout period allowed may be set to timeout seconds with this
       option.

SECURITY NOTE

       This security-sensitive command uses the SIA (Security Integration Architecture) routine as an interface to the	security  mechanisms.  See
       matrix.conf(4) for more information.

DESCRIPTION

       The  ftpd command is the DARPA (Defense Advanced Research Projects Agency) Internet File Transfer Protocol server process.  The server uses
       the TCP protocol and listens at the port specified in the FTP service specification; see services(4).

       The ftpd command includes two flags to control the information logged for the ftpd daemon.  If the -d flag is specified, debugging informa-
       tion  is  logged.  If the -l flag is specified, each ftp session, along with data for login failures and file operations, is logged.  Refer
       to the syslogd(8) reference page for information on system log files.

       The FTP server will time out an inactive session after 15 minutes.  If the -t flag is specified, the inactivity time-out period will be set
       to time-out seconds.  A client may also request a different time-out period; the maximum period allowed may be set to time-out seconds with
       the -T flag. The default limit is 2 hours.

       If you want to use a customized banner, create an /etc/banner file.  The ftpd daemon reads the file, if it exists, and writes its  contents
       over a new FTP connection prior to starting the login dialog.

       The FTP server currently supports the following ftp requests; case is not distinguished: Description Abort previous command Specify account
       (ignored) Allocate storage (vacuously) Append to a file Change to parent of current working directory Change  working  directory  Delete  a
       file  Prepare for proxy transfer (default) and server-to-server transfer Specify data connection port Give help information Give list files
       in a directory (ls -lgA) Specify data connection port (IPv6 addresses only) Prepare for server-to-server  transfer  (IPv6  addresses  only)
       Make  a	directory  Show  last modification time of file Specify data transfer mode Give name list of files in directory Do nothing Specify
       password Prepare for server-to-server transfer (IPv4 addresses only) Specify data connection port (IPv4 addresses only) Print  the  current
       working	directory  Terminate  session Restart incomplete transfer Retrieve a file Remove a directory Specify rename-from file name Specify
       rename-to file name Nonstandard commands (see next section) Return size of file Return status of server Store a file Store a  file  with  a
       unique  name Specify data transfer structure Show operating system type of server system Specify data transfer type Specify username Change
       to parent of current working directory (deprecated) Change working directory (deprecated) Make a directory (deprecated) Print  the  current
       working directory (deprecated) Remove a directory (deprecated)

       The  following nonstandard or UNIX compatible commands are supported by the SITE request: Description Change umask (for example, SITE UMASK
       002) Set idle timer (for example, SITE IDLE 60) Change mode of a file (for example, SITE CHMOD 755 filename)  Give  help  information  (for
       example, SITE HELP)

       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.

       The ftpd command interprets file names according to the ``globbing'' conventions used by the C shell  (see  csh(1)).   This  interpretation
       allows users to utilize the metacharacters ``*?[]{}~''.

       The  ftpd  command  authenticates users according to four rules: The username must be in the password database, /etc/passwd, and not have a
       null password.  In this case, a password must be provided by the client before any file operations may be performed.  The username must not
       appear  in  the /etc/ftpusers file.  The user must have a standard shell returned by the getusershell() call (see getusershell(3)).  If the
       username is anonymous or ftp, an anonymous ftp account must be present in the password file (user ftp).	In this case, the user is  allowed
       to log in by specifying any password (by convention this is given as the client host's name).

       The ftp command uses the default Type-of-Service values recommended by RFC1060, which are as follows: Low delay High throughput

   Anonymous FTP Configuration
       If you are creating an anonymous FTP account, ftpd takes special measures to restrict the client's access privileges when the user logs in.
       The server executes a chroot call (see chroot(2)) to the home directory of the ftp user.  In order that system security is not breached, it
       is recommended that you adhere to the following rules when creating directories and files in the ftp subtree: Make the home directory owned
       by the superuser (root) and unwritable by anyone.  Make this directory owned by the superuser and unwritable by	anyone.   The  ls  program
       (see ls(1)) must be present to support the list command.  This program should have mode 111.

	      Copy  the  ls  program from /sbin/ls. This is the statically linked version of the ls command, which does not require shared library
	      support.	Be sure to copy the static version of ls from the /sbin directory, not the shared version  from  the  /usr/bin	directory.
	      Make  this directory owned by the superuser and unwritable by anyone.  The passwd and group files (see passwd(4) and group(4) ) must
	      be present for the ls command to be able to produce owner names rather than numbers.  The password field in the passwd file  is  not
	      used, and should not contain real encrypted passwords.  These files should be mode 444.

	      In  this	environment, the sia subdirectory (which you can copy from /etc/sia) must also be present for the ls command to be able to
	      produce owner names rather than numbers.	Make this directory mode 777 and owned by ftp.	Users should then place files that are	to
	      be accessible via the anonymous account in this directory.

       You can configure these values by specifying them in the /etc/iptos file. For more information, see iptos(4).

FILES

       Specifies the command path.  Contains the list of unauthorized users.  Specifies the path name for the banner file.

CAUTIONS

       The anonymous account is inherently dangerous and should be avoided when possible.

       The  server  must  run as the superuser to create sockets with privileged port numbers.	It maintains an effective user ID of the logged in
       user, reverting to the superuser only when binding addresses to sockets.  The possible security holes have  been  extensively  scrutinized,
       but are possibly incomplete.

RELATED INFORMATION

       Commands: ftp(1), syslogd(8)

       Functions: getusershell(3)

       Files: iptos(4)

       delim off

																	   ftpd(8)