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rsyncd.conf(5)							rsyncd.conf(5)

NAME
       rsyncd.conf - configuration file	for rsync in daemon mode

SYNOPSIS
       rsyncd.conf

DESCRIPTION
       The  rsyncd.conf	 file is the runtime configuration file	for rsync when
       run as an rsync daemon.

       The rsyncd.conf	file  controls	authentication,	 access,  logging  and
       available modules.

FILE FORMAT
       The  file  consists of modules and parameters. A	module begins with the
       name of the module in square brackets and continues until the next mod-
       ule begins. Modules contain parameters of the form "name	= value".

       The  file is line-based -- that is, each	newline-terminated line	repre-
       sents either a comment, a module	name or	a parameter.

       Only the	first equals sign in a parameter  is  significant.  Whitespace
       before  or  after the first equals sign is discarded. Leading, trailing
       and internal whitespace in module and parameter	names  is  irrelevant.
       Leading	and trailing whitespace	in a parameter value is	discarded. In-
       ternal whitespace within	a parameter value is retained verbatim.

       Any line	beginning with a hash (#) is ignored, as are lines  containing
       only  whitespace.  (If  a hash occurs after anything other than leading
       whitespace, it is considered a part of the line's content.)

       Any line	ending in a \ is "continued" on	the next line in the customary
       UNIX fashion.

       The  values  following  the  equals sign	in parameters are all either a
       string (no quotes needed) or a boolean, which may be given  as  yes/no,
       0/1  or	true/false.  Case is not significant in	boolean	values,	but is
       preserved in string values.

LAUNCHING THE RSYNC DAEMON
       The rsync daemon	is launched  by	 specifying  the  --daemon  option  to
       rsync.

       The  daemon must	run with root privileges if you	wish to	use chroot, to
       bind to a port numbered under 1024 (as is the default 873), or  to  set
       file  ownership.	  Otherwise,  it must just have	permission to read and
       write the appropriate data, log,	and lock files.

       You can launch it either	via inetd, as a	stand-alone daemon, or from an
       rsync  client  via a remote shell.  If run as a stand-alone daemon then
       just run	the command "rsync --daemon" from a suitable startup script.

       When run	via inetd  you	should	add  a	line  like  this  to  /usr/lo-
       cal/etc/rsync/services:

	 rsync		 873/tcp

       and  a  single  line  something	like  this to /usr/local/etc/rsync/in-
       etd.conf:

	 rsync	 stream	 tcp	 nowait	 root	/usr/bin/rsync rsyncd --daemon

       Replace "/usr/bin/rsync"	with the path to  where	 you  have  rsync  in-
       stalled	on your	system.	 You will then need to send inetd a HUP	signal
       to tell it to reread its	config file.

       Note that you should not	send the rsync daemon a	HUP signal to force it
       to reread the rsyncd.conf file. The file	is re-read on each client con-
       nection.

GLOBAL PARAMETERS
       The first parameters in the file	(before	a  [module]  header)  are  the
       global  parameters.  Rsync also allows for the use of a "[global]" mod-
       ule name	to indicate the	start of one or	more global-parameter sections
       (the name must be lower case).

       You  may	 also  include any module parameters in	the global part	of the
       config file in which case the supplied value will override the  default
       for that	parameter.

       You may use references to environment variables in the values of	param-
       eters.  String parameters will have %VAR% references expanded  as  late
       as  possible (when the string is	used in	the program), allowing for the
       use  of	variables  that	 rsync	sets  at  connection  time,  such   as
       RSYNC_USER_NAME.	  Non-string  parameters (such as true/false settings)
       are expanded when read from the config file.  If	a  variable  does  not
       exist in	the environment, or if a sequence of characters	is not a valid
       reference (such as an un-paired percent sign), the raw  characters  are
       passed  through	unchanged.  This helps with backward compatibility and
       safety (e.g. expanding a	non-existent %VAR% to an  empty	 string	 in  a
       path  could  result in a	very unsafe path).  The	safest way to insert a
       literal % into a	value is to use	%%.

       motd file
	      This parameter allows you	to specify a "message of the  day"  to
	      display  to  clients on each connect. This usually contains site
	      information and any legal	notices. The default is	no motd	 file.
	      This  can	 be  overridden	 by  the  --dparam=motdfile=FILE  com-
	      mand-line	option when starting the daemon.

       pid file
	      This parameter tells the rsync daemon to write its process ID to
	      that  file.   If	the file already exists, the rsync daemon will
	      abort rather than	overwrite the file.  This can be overridden by
	      the  --dparam=pidfile=FILE command-line option when starting the
	      daemon.

       port   You can override the default port	the daemon will	listen	on  by
	      specifying this value (defaults to 873).	This is	ignored	if the
	      daemon is	being run by inetd, and	is superseded  by  the	--port
	      command-line option.

       address
	      You  can	override the default IP	address	the daemon will	listen
	      on by specifying this value.  This is ignored if the  daemon  is
	      being  run  by  inetd,  and  is superseded by the	--address com-
	      mand-line	option.

       socket options
	      This parameter can provide endless fun for people	 who  like  to
	      tune  their  systems to the utmost degree. You can set all sorts
	      of socket	options	which may make transfers faster	(or  slower!).
	      Read  the	 man page for the setsockopt() system call for details
	      on some of the options you may be	able to	 set.  By  default  no
	      special  socket  options	are  set.   These settings can also be
	      specified	via the	--sockopts command-line	option.

       listen backlog
	      You can override the default backlog value when the daemon  lis-
	      tens for connections.  It	defaults to 5.

MODULE PARAMETERS
       After the global	parameters you should define a number of modules, each
       module exports a	directory tree as a symbolic  name.  Modules  are  ex-
       ported by specifying a module name in square brackets [module] followed
       by the parameters for that module.  The module name  cannot  contain  a
       slash  or  a  closing square bracket.  If the name contains whitespace,
       each internal sequence of whitespace will  be  changed  into  a	single
       space,  while  leading or trailing whitespace will be discarded.	 Also,
       the name	cannot be "global" as that exact name  indicates  that	global
       parameters follow (see above).

       As  with	GLOBAL PARAMETERS, you may use references to environment vari-
       ables in	the values of parameters.  See the GLOBAL  PARAMETERS  section
       for more	details.

       comment
	      This  parameter specifies	a description string that is displayed
	      next to the module name when clients obtain a list of  available
	      modules. The default is no comment.

       path   This  parameter specifies	the directory in the daemon's filesys-
	      tem to make available in this module.  You must specify this pa-
	      rameter for each module in rsyncd.conf.

	      You  may base the	path's value off of an environment variable by
	      surrounding the variable name with percent signs.	 You can  even
	      reference	 a  variable  that  is set by rsync when the user con-
	      nects.  For example, this	would use the authorizing user's  name
	      in the path:

		  path = /home/%RSYNC_USER_NAME%

	      It  is fine if the path includes internal	spaces -- they will be
	      retained verbatim	(which means that you shouldn't	try to	escape
	      them).   If  your	final directory	has a trailing space (and this
	      is somehow not something you wish	to  fix),  append  a  trailing
	      slash to the path	to avoid losing	the trailing whitespace.

       use chroot
	      If  "use	chroot"	 is  true, the rsync daemon will chroot	to the
	      "path" before starting the file transfer with the	client.	  This
	      has the advantage	of extra protection against possible implemen-
	      tation security holes, but it has	the disadvantages of requiring
	      super-user  privileges,  of  not	being  able to follow symbolic
	      links that are either absolute or	outside	of the new root	 path,
	      and of complicating the preservation of users and	groups by name
	      (see below).

	      As an additional safety feature, you can specify	a  dot-dir  in
	      the  module's  "path"  to	 indicate  the	point where the	chroot
	      should occur.  This allows rsync to  run	in  a  chroot  with  a
	      non-"/"  path for	the top	of the transfer	hierarchy.  Doing this
	      guards against unintended	library	loading	(since those  absolute
	      paths  will not be inside	the transfer hierarchy unless you have
	      used an unwise pathname),	and lets you setup libraries  for  the
	      chroot  that are outside of the transfer.	 For example, specify-
	      ing "/var/rsync/./module1" will chroot to	the  "/var/rsync"  di-
	      rectory  and  set	 the inside-chroot path	to "/module1".	If you
	      had omitted the dot-dir, the chroot would	have  used  the	 whole
	      path, and	the inside-chroot path would have been "/".

	      When "use	chroot"	is false or the	inside-chroot path is not "/",
	      rsync will: (1) munge symlinks by	default	for  security  reasons
	      (see  "munge  symlinks"  for a way to turn this off, but only if
	      you trust	your users), (2) substitute leading slashes  in	 abso-
	      lute  paths  with	 the  module's	path  (so that options such as
	      --backup-dir, --compare-dest, etc. interpret an absolute path as
	      rooted  in the module's "path" dir), and (3) trim	".." path ele-
	      ments from args if rsync believes	they would escape  the	module
	      hierarchy.   The	default	 for  "use chroot" is true, and	is the
	      safer choice (especially if the module is	not read-only).

	      When this	parameter is enabled, the  "numeric-ids"  option  will
	      also default to being enabled (disabling name lookups).  See be-
	      low for what a chroot needs in order for name  lookups  to  suc-
	      ceed.

	      If you copy library resources into the module's chroot area, you
	      should protect them through your OS's normal user/group  or  ACL
	      settings	(to prevent the	rsync module's user from being able to
	      change them), and	then hide them from the	user's view  via  "ex-
	      clude"  (see  how	in the discussion of that parameter).  At that
	      point it will be safe to enable the mapping of users and	groups
	      by name using this "numeric ids" daemon parameter.

	      Note  also that you are free to setup custom user/group informa-
	      tion in the chroot area that is different	from your normal  sys-
	      tem.   For  example,  you	could abbreviate the list of users and
	      groups.

       numeric ids
	      Enabling this parameter disables the mapping of users and	groups
	      by name for the current daemon module.  This prevents the	daemon
	      from trying to load any user/group-related files	or  libraries.
	      This  enabling  makes  the  transfer behave as if	the client had
	      passed the --numeric-ids command-line option.  By	default,  this
	      parameter	is enabled for chroot modules and disabled for non-ch-
	      root modules.  Also keep in mind that uid/gid  preservation  re-
	      quires the module	to be running as root (see "uid") or for "fake
	      super" to	be configured.

	      A	chroot-enabled module should not have this  parameter  enabled
	      unless you've taken steps	to ensure that the module has the nec-
	      essary resources it needs	to translate names, and	that it	is not
	      possible	for  a	user to	change those resources.	 That includes
	      being the	code being able	to call	functions  like	 getpwuid()  ,
	      getgrgid()  ,  getpwname()  , and	getgrnam() ).  You should test
	      what libraries and config	files are required for your OS and get
	      those setup before starting to test name mapping in rsync.

       munge symlinks
	      This  parameter  tells  rsync to modify all symlinks in the same
	      way as the (non-daemon-affecting)	--munge-links command-line op-
	      tion (using a method described below).  This should help protect
	      your files  from	user  trickery	when  your  daemon  module  is
	      writable.	  The  default is disabled when	"use chroot" is	on and
	      the inside-chroot	path is	"/", otherwise it is enabled.

	      If you disable this parameter on a daemon	that is	not read-only,
	      there  are tricks	that a user can	play with uploaded symlinks to
	      access daemon-excluded items (if your module has any),  and,  if
	      "use  chroot"  is	off, rsync can even be tricked into showing or
	      changing data that is outside the	module's path (as  access-per-
	      missions allow).

	      The way rsync disables the use of	symlinks is to prefix each one
	      with the string "/rsyncd-munged/".  This prevents	the links from
	      being  used as long as that directory does not exist.  When this
	      parameter	is enabled, rsync will refuse to run if	that path is a
	      directory	 or  a	symlink	to a directory.	 When using the	"munge
	      symlinks"	parameter in a chroot area that	has  an	 inside-chroot
	      path  of	"/",  you  should add "/rsyncd-munged/"	to the exclude
	      setting for the module so	that a user can't try to create	it.

	      Note:  rsync makes no attempt to verify  that  any  pre-existing
	      symlinks	in the module's	hierarchy are as safe as you want them
	      to be (unless, of	course,	it just	copied in  the	whole  hierar-
	      chy).  If	you setup an rsync daemon on a new area	or locally add
	      symlinks,	you can	manually  protect  your	 symlinks  from	 being
	      abused by	prefixing "/rsyncd-munged/" to the start of every sym-
	      link's value.  There is a	perl script in the  support  directory
	      of  the  source  code named "munge-symlinks" that	can be used to
	      add or remove this prefix	from your symlinks.

	      When this	parameter is disabled on a writable  module  and  "use
	      chroot"  is off (or the inside-chroot path is not	"/"), incoming
	      symlinks will be modified	to drop	a leading slash	and to	remove
	      ".."  path  elements that	rsync believes will allow a symlink to
	      escape the module's hierarchy.  There are	tricky	ways  to  work
	      around  this,  though, so	you had	better trust your users	if you
	      choose this combination of parameters.

       charset
	      This specifies the name of the character set in which  the  mod-
	      ule's  filenames	are stored.  If	the client uses	an --iconv op-
	      tion, the	daemon will use	the value of the  "charset"  parameter
	      regardless  of  the  character  set  the client actually passed.
	      This allows the daemon to	support	charset	conversion in a	chroot
	      module  without extra files in the chroot	area, and also ensures
	      that name-translation is done in a consistent  manner.   If  the
	      "charset"	 parameter  is not set,	the --iconv option is refused,
	      just as if "iconv" had been specified via	"refuse	options".

	      If you wish to force users to always use --iconv for a  particu-
	      lar  module,  add	 "no-iconv" to the "refuse options" parameter.
	      Keep in mind that	this will restrict access to  your  module  to
	      very new rsync clients.

       max connections
	      This  parameter  allows you to specify the maximum number	of si-
	      multaneous connections you will allow.  Any  clients  connecting
	      when the maximum has been	reached	will receive a message telling
	      them to try later.  The default is 0, which means	no  limit.   A
	      negative	value  disables	 the module.  See also the "lock file"
	      parameter.

       log file
	      When the "log file" parameter is set to a	non-empty string,  the
	      rsync daemon will	log messages to	the indicated file rather than
	      using syslog. This is particularly useful	on  systems  (such  as
	      AIX)  where  syslog()  doesn't  work for chrooted	programs.  The
	      file is opened before chroot() is	 called,  allowing  it	to  be
	      placed outside the transfer.  If this value is set on a per-mod-
	      ule basis	instead	of globally, the global	log will still contain
	      any authorization	failures or config-file	error messages.

	      If  the  daemon  fails  to open the specified file, it will fall
	      back to using syslog and output  an  error  about	 the  failure.
	      (Note that the failure to	open the specified log file used to be
	      a	fatal error.)

	      This setting can be overridden by	using the  --log-file=FILE  or
	      --dparam=logfile=FILE  command-line  options.   The former over-
	      rides all	the log-file parameters	of the daemon and  all	module
	      settings.	 The latter sets the daemon's log file and the default
	      for all the modules, which still allows modules to override  the
	      default setting.

       syslog facility
	      This parameter allows you	to specify the syslog facility name to
	      use when logging messages	from the rsync daemon. You may use any
	      standard	syslog	facility name which is defined on your system.
	      Common names are auth, authpriv, cron, daemon, ftp,  kern,  lpr,
	      mail,  news,  security,  syslog, user, uucp, local0, local1, lo-
	      cal2, local3, local4, local5, local6 and local7. The default  is
	      daemon.  This setting has	no effect if the "log file" setting is
	      a	non-empty string (either set in	the per-modules	 settings,  or
	      inherited	from the global	settings).

       max verbosity
	      This  parameter allows you to control the	maximum	amount of ver-
	      bose information that you'll allow the daemon to generate	(since
	      the information goes into	the log	file). The default is 1, which
	      allows the client	to request one level of	verbosity.

	      This also	affects	the user's ability to request higher levels of
	      --info and --debug logging.  If the max value is 2, then no info
	      and/or debug value that is higher	than what would	be set by  -vv
	      will  be	honored	by the daemon in its logging.  To see how high
	      of a verbosity  level  you  need	to  accept  for	 a  particular
	      info/debug  level, refer to "rsync --info=help" and "rsync --de-
	      bug=help".  For instance,	it takes max-verbosity 4 to be able to
	      output debug TIME2 and FLIST3.

       lock file
	      This  parameter  specifies  the  file to use to support the "max
	      connections" parameter. The rsync	daemon uses record locking  on
	      this  file  to  ensure that the max connections limit is not ex-
	      ceeded for the modules sharing the lock file.   The  default  is
	      /var/run/rsyncd.lock.

       read only
	      This parameter determines	whether	clients	will be	able to	upload
	      files or not. If "read only" is true then	any attempted  uploads
	      will fail. If "read only"	is false then uploads will be possible
	      if file permissions on the daemon	side allow them.  The  default
	      is for all modules to be read only.

	      Note  that  "auth	users" can override this setting on a per-user
	      basis.

       write only
	      This parameter determines	whether	clients	will be	able to	 down-
	      load  files  or  not. If "write only" is true then any attempted
	      downloads	will fail. If "write only"  is	false  then  downloads
	      will  be	possible  if file permissions on the daemon side allow
	      them.  The default is for	this parameter to be disabled.

       list   This parameter determines	whether	this module is listed when the
	      client asks for a	listing	of available modules.  In addition, if
	      this is false, the daemon	will pretend the module	does not exist
	      when  a  client denied by	"hosts allow" or "hosts	deny" attempts
	      to access	it.  Realize that  if  "reverse	 lookup"  is  disabled
	      globally	but  enabled  for  the	module,	 the resulting reverse
	      lookup to	a potentially client-controlled	DNS server  may	 still
	      reveal  to  the  client that it hit an existing module.  The de-
	      fault is for modules to be listable.

       uid    This parameter specifies the user	name  or  user	ID  that  file
	      transfers	 to and	from that module should	take place as when the
	      daemon was run as	root. In combination with the "gid"  parameter
	      this determines what file	permissions are	available. The default
	      when run by a super-user is to switch to the  system's  "nobody"
	      user.   The default for a	non-super-user is to not try to	change
	      the user.	 See also the "gid" parameter.

	      The RSYNC_USER_NAME environment variable may be used to  request
	      that  rsync  run	as  the	authorizing user.  For example,	if you
	      want a rsync to run as the same user that	was received  for  the
	      rsync authentication, this setup is useful:

		  uid =	%RSYNC_USER_NAME%
		  gid =	*

       gid    This  parameter  specifies one or	more group names/IDs that will
	      be used when accessing the module.  The first one	 will  be  the
	      default group, and any extra ones	be set as supplemental groups.
	      You may also specify a "*" as the	first gid in the  list,	 which
	      will  be	replaced  by  all the normal groups for	the transfer's
	      user (see	"uid").	 The default when run by a  super-user	is  to
	      switch  to  your OS's "nobody" (or perhaps "nogroup") group with
	      no other supplementary groups.  The default for a	non-super-user
	      is  to  not change any group attributes (and indeed, your	OS may
	      not allow	a non-super-user to try	to  change  their  group  set-
	      tings).

       fake super
	      Setting  "fake  super = yes" for a module	causes the daemon side
	      to behave	as if the --fake-super command-line  option  had  been
	      specified.   This	 allows	 the  full  attributes of a file to be
	      stored without having to have the	 daemon	 actually  running  as
	      root.

       filter The  daemon  has its own filter chain that determines what files
	      it will let the client access.  This chain is not	 sent  to  the
	      client  and  is  independent  of any filters the client may have
	      specified.  Files	excluded by  the  daemon  filter  chain	 (dae-
	      mon-excluded  files)  are	 treated as non-existent if the	client
	      tries to pull them, are skipped with an  error  message  if  the
	      client  tries  to	 push  them (triggering	exit code 23), and are
	      never deleted from the module.  You can use  daemon  filters  to
	      prevent  clients	from downloading or tampering with private ad-
	      ministrative files, such as files	you may	add to support uid/gid
	      name translations.

	      The  daemon  filter  chain  is built from	the "filter", "include
	      from", "include",	"exclude from",	and "exclude"  parameters,  in
	      that  order  of priority.	 Anchored patterns are anchored	at the
	      root of the module.  To prevent access to	an entire subtree, for
	      example,	"/secret", you must exclude everything in the subtree;
	      the easiest way to do this is with a  triple-star	 pattern  like
	      "/secret/***".

	      The  "filter"  parameter	takes a	space-separated	list of	daemon
	      filter rules, though it is smart enough to know not to  split  a
	      token  at	 an internal space in a	rule (e.g. "- /foo  - /bar" is
	      parsed as	two rules).  You may specify one  or  more  merge-file
	      rules  using the normal syntax.  Only one	"filter" parameter can
	      apply to a given module in the config file, so put all the rules
	      you  want	 in  a	single	parameter.   Note  that	 per-directory
	      merge-file rules do not provide as  much	protection  as	global
	      rules,  but they can be used to make --delete work better	during
	      a	client download	operation if the per-dir merge files  are  in-
	      cluded  in  the  transfer	 and  the client requests that they be
	      used.

       exclude
	      This parameter takes a space-separated list  of  daemon  exclude
	      patterns.	  As with the client --exclude option, patterns	can be
	      qualified	with "-	" or "+	" to explicitly	 indicate  exclude/in-
	      clude.   Only  one "exclude" parameter can apply to a given mod-
	      ule.  See	the "filter" parameter for a description  of  how  ex-
	      cluded files affect the daemon.

       include
	      Use an "include" to override the effects of the "exclude"	param-
	      eter.  Only one "include"	parameter can apply to a given module.
	      See  the	"filter"  parameter  for a description of how excluded
	      files affect the daemon.

       exclude from
	      This parameter specifies the name	of a file on the  daemon  that
	      contains	daemon	exclude	patterns, one per line.	 Only one "ex-
	      clude from" parameter can	apply to a given module; if  you  have
	      multiple	exclude-from  files,  you  can specify them as a merge
	      file in the "filter" parameter.  See the "filter"	parameter  for
	      a	description of how excluded files affect the daemon.

       include from
	      Analogue	of  "exclude  from"  for a file	of daemon include pat-
	      terns.  Only one "include	from" parameter	can apply to  a	 given
	      module.  See the "filter"	parameter for a	description of how ex-
	      cluded files affect the daemon.

       incoming	chmod
	      This parameter allows you	to specify a  set  of  comma-separated
	      chmod  strings  that will	affect the permissions of all incoming
	      files (files that	are being  received  by	 the  daemon).	 These
	      changes happen after all other permission	calculations, and this
	      will even	override destination-default and/or  existing  permis-
	      sions  when  the	client	does not specify --perms.  See the de-
	      scription	of the --chmod rsync option and	the  chmod(1)  manpage
	      for information on the format of this string.

       outgoing	chmod
	      This  parameter  allows  you to specify a	set of comma-separated
	      chmod strings that will affect the permissions of	 all  outgoing
	      files  (files  that  are being sent out from the daemon).	 These
	      changes happen first, making the sent permissions	appear	to  be
	      different	 than  those stored in the filesystem itself.  For in-
	      stance, you could	disable	group write permissions	on the	server
	      while  having  it	 appear	 to be on to the clients.  See the de-
	      scription	of the --chmod rsync option and	the  chmod(1)  manpage
	      for information on the format of this string.

       auth users
	      This  parameter specifies	a comma	and/or space-separated list of
	      authorization rules.  In its simplest form, you list  the	 user-
	      names  that will be allowed to connect to	this module. The user-
	      names do not need	to exist on the	local system.  The  rules  may
	      contain  shell  wildcard characters that will be matched against
	      the username provided by the client for authentication. If "auth
	      users"  is  set  then  the client	will be	challenged to supply a
	      username and password to connect to the module. A	challenge  re-
	      sponse  authentication  protocol	is used	for this exchange. The
	      plain text usernames and passwords are stored in the file	speci-
	      fied  by	the  "secrets  file" parameter.	The default is for all
	      users to be able to connect without a password (this  is	called
	      "anonymous rsync").

	      In  addition  to	username  matching,  you can specify groupname
	      matching via a '@' prefix.  When using groupname	matching,  the
	      authenticating username must be a	real user on the system, or it
	      will be assumed to be a member of	no groups.  For	example, spec-
	      ifying  "@rsync" will match the authenticating user if the named
	      user is a	member of the rsync group.

	      Finally, options may be specified	after a	colon  (:).   The  op-
	      tions  allow  you	to "deny" a user or a group, set the access to
	      "ro" (read-only),	or set the access to "rw" (read/write).	  Set-
	      ting  an auth-rule-specific ro/rw	setting	overrides the module's
	      "read only" setting.

	      Be sure to put the rules in  the	order  you  want  them	to  be
	      matched,	because	 the checking stops at the first matching user
	      or group,	and that is the	only auth that is checked.  For	 exam-
	      ple:

		auth users = joe:deny @guest:deny admin:rw @rsync:ro susan joe sam

	      In  the  above  rule,  user  joe will be denied access no	matter
	      what.  Any user that is in the group "guest" is also denied  ac-
	      cess.  The user "admin" gets access in read/write	mode, but only
	      if the admin user	is not in group	 "guest"  (because  the	 admin
	      user-matching  rule  would  never	 be  reached if	the user is in
	      group "guest").  Any other user who is in	group "rsync" will get
	      read-only	 access.   Finally,  users susan, joe, and sam get the
	      ro/rw setting of the module, but only if the user	 didn't	 match
	      an earlier group-matching	rule.

	      See  the	description  of	 the secrets file for how you can have
	      per-user passwords as well as per-group passwords.  It also  ex-
	      plains  how a user can authenticate using	their user password or
	      (when applicable)	a group	password, depending on	what  rule  is
	      being authenticated.

	      See also the section entitled "USING RSYNC-DAEMON	FEATURES VIA A
	      REMOTE SHELL CONNECTION" in rsync(1) for information on how han-
	      dle  an  rsyncd.conf-level  username  that  differs from the re-
	      mote-shell-level username	when using a remote shell  to  connect
	      to an rsync daemon.

       secrets file
	      This  parameter  specifies  the name of a	file that contains the
	      username:password	and/or @groupname:password pairs used for  au-
	      thenticating  this  module.  This	 file is only consulted	if the
	      "auth users" parameter is	specified.  The	file is	line-based and
	      contains	one  name:password pair	per line.  Any line has	a hash
	      (#) as the very first character on the line is considered	a com-
	      ment  and	 is skipped.  The passwords can	contain	any characters
	      but be warned that many operating	systems	limit  the  length  of
	      passwords	 that  can be typed at the client end, so you may find
	      that passwords longer than 8 characters don't work.

	      The use of group-specific	lines are only relevant	when the  mod-
	      ule  is  being  authorized  using	 a matching "@groupname" rule.
	      When that	happens, the user can be authorized via	 either	 their
	      "username:password"  line	 or the	"@groupname:password" line for
	      the group	that triggered the authentication.

	      It is up to you what kind	of password entries you	 want  to  in-
	      clude, either users, groups, or both.  The use of	group rules in
	      "auth users" does	not require that you specify a group  password
	      if you do	not want to use	shared passwords.

	      There  is	 no default for	the "secrets file" parameter, you must
	      choose a	name  (such  as	 /usr/local/etc/rsync/rsyncd.secrets).
	      The  file	 must normally not be readable by "other"; see "strict
	      modes".  If the file is not found	or is rejected,	no logins  for
	      a	"user auth" module will	be possible.

       strict modes
	      This  parameter determines whether or not	the permissions	on the
	      secrets file will	be checked.  If	"strict	modes" is  true,  then
	      the  secrets file	must not be readable by	any user ID other than
	      the one that the rsync daemon  is	 running  under.   If  "strict
	      modes"  is  false,  the  check is	not performed.	The default is
	      true.  This parameter was	added to accommodate rsync running  on
	      the Windows operating system.

       hosts allow
	      This parameter allows you	to specify a list of patterns that are
	      matched against a	connecting clients hostname and	IP address. If
	      none of the patterns match then the connection is	rejected.

	      Each pattern can be in one of five forms:

	      o	     a	dotted decimal IPv4 address of the form	a.b.c.d, or an
		     IPv6 address of the form a:b:c::d:e:f. In this  case  the
		     incoming machine's	IP address must	match exactly.

	      o	     an	 address/mask in the form ipaddr/n where ipaddr	is the
		     IP	address	and n is the number of one bits	 in  the  net-
		     mask.  All	IP addresses which match the masked IP address
		     will be allowed in.

	      o	     an	address/mask in	the form ipaddr/maskaddr where	ipaddr
		     is	 the  IP address and maskaddr is the netmask in	dotted
		     decimal notation for IPv4,	 or  similar  for  IPv6,  e.g.
		     ffff:ffff:ffff:ffff::  instead  of	 /64. All IP addresses
		     which match the masked IP address will be allowed in.

	      o	     a hostname	pattern	using wildcards. If  the  hostname  of
		     the  connecting  IP  (as  determined by a reverse lookup)
		     matches the wildcarded name (using	the same rules as nor-
		     mal  unix	filename  matching), the client	is allowed in.
		     This only works if	"reverse lookup" is enabled  (the  de-
		     fault).

	      o	     a	hostname.  A plain hostname is matched against the re-
		     verse DNS of the connecting IP (if	 "reverse  lookup"  is
		     enabled),	and/or the IP of the given hostname is matched
		     against the connecting IP (if  "forward  lookup"  is  en-
		     abled,  as	 it is by default).  Any match will be allowed
		     in.

	      Note IPv6	link-local addresses can have a	scope in  the  address
	      specification:

		  fe80::1%link1
		  fe80::%link1/64
		  fe80::%link1/ffff:ffff:ffff:ffff::

	      You  can also combine "hosts allow" with a separate "hosts deny"
	      parameter. If both parameters are	specified then the "hosts  al-
	      low"  parameter  is  checked  first  and	a match	results	in the
	      client being able	to connect. The	"hosts deny" parameter is then
	      checked and a match means	that the host is rejected. If the host
	      does not match either the	"hosts allow" or the "hosts deny" pat-
	      terns then it is allowed to connect.

	      The default is no	"hosts allow" parameter, which means all hosts
	      can connect.

       hosts deny
	      This parameter allows you	to specify a list of patterns that are
	      matched against a	connecting clients hostname and	IP address. If
	      the pattern matches then the connection  is  rejected.  See  the
	      "hosts allow" parameter for more information.

	      The  default is no "hosts	deny" parameter, which means all hosts
	      can connect.

       reverse lookup
	      Controls whether the daemon performs a  reverse  lookup  on  the
	      client's IP address to determine its hostname, which is used for
	      "hosts allow"/"hosts deny" checks	and the	"%h" log escape.  This
	      is  enabled  by  default,	but you	may wish to disable it to save
	      time if you know the lookup will not return a useful result,  in
	      which case the daemon will use the name "UNDETERMINED" instead.

	      If  this	parameter is enabled globally (even by default), rsync
	      performs the lookup as soon as a client connects,	 so  disabling
	      it  for  a module	will not avoid the lookup.  Thus, you probably
	      want to disable it globally and then enable it for modules  that
	      need the information.

       forward lookup
	      Controls	whether	 the  daemon  performs a forward lookup	on any
	      hostname specified in an hosts allow/deny	setting.   By  default
	      this  is	enabled, allowing the use of an	explicit hostname that
	      would not	be returned by reverse DNS of the connecting IP.

       ignore errors
	      This parameter tells rsyncd to ignore I/O	errors on  the	daemon
	      when  deciding  whether to run the delete	phase of the transfer.
	      Normally rsync skips the --delete	step if	any  I/O  errors  have
	      occurred in order	to prevent disastrous deletion due to a	tempo-
	      rary resource shortage or	other I/O error. In  some  cases  this
	      test is counter productive so you	can use	this parameter to turn
	      off this behavior.

       ignore nonreadable
	      This tells the rsync daemon to completely	ignore files that  are
	      not  readable  by	 the  user. This is useful for public archives
	      that may have some non-readable files among the directories, and
	      the sysadmin doesn't want	those files to be seen at all.

       transfer	logging
	      This parameter enables per-file logging of downloads and uploads
	      in a format somewhat similar to that used	by ftp	daemons.   The
	      daemon  always logs the transfer at the end, so if a transfer is
	      aborted, no mention will be made in the log file.

	      If you want to customize the log lines, see the "log format" pa-
	      rameter.

       log format
	      This parameter allows you	to specify the format used for logging
	      file transfers when transfer logging is enabled.	The format  is
	      a	 text  string  containing embedded single-character escape se-
	      quences prefixed with a percent (%) character.  An optional  nu-
	      meric  field width may also be specified between the percent and
	      the escape letter	(e.g. "%-50n %8l %07p").  In addition, one  or
	      more apostrophes may be specified	prior to a numerical escape to
	      indicate that the	 numerical  value  should  be  made  more  hu-
	      man-readable.   The  3  supported	levels are the same as for the
	      --human-readable command-line option, though the default is  for
	      human-readability	 to  be	 off.  Each added apostrophe increases
	      the level	(e.g. "%''l %'b	%f").

	      The default log format is	"%o %h [%a] %m (%u) %f %l", and	a  "%t
	      [%p]  "  is always prefixed when using the "log file" parameter.
	      (A perl script that will summarize this default  log  format  is
	      included	in the rsync source code distribution in the "support"
	      subdirectory: rsyncstats.)

	      The single-character escapes that	are understood are as follows:

	      o	     %a	the remote IP address (only available for a daemon)

	      o	     %b	the number of bytes actually transferred

	      o	     %B	the permission bits of the file	(e.g. rwxrwxrwt)

	      o	     %c	the total size of the block checksums received for the
		     basis file	(only when sending)

	      o	     %C	the full-file MD5 checksum if --checksum is enabled or
		     a file was	transferred (only for protocol 30 or above).

	      o	     %f	the filename (long form	on sender; no trailing "/")

	      o	     %G	the gid	of the file (decimal) or "DEFAULT"

	      o	     %h	the remote host	name (only available for a daemon)

	      o	     %i	an itemized list of what is being updated

	      o	     %l	the length of the file in bytes

	      o	     %L	the string " ->	SYMLINK", " => HARDLINK", or ""	(where
		     SYMLINK or	HARDLINK is a filename)

	      o	     %m	the module name

	      o	     %M	the last-modified time of the file

	      o	     %n	the filename (short form; trailing "/" on dir)

	      o	     %o	the operation, which is	"send",	"recv",	or "del." (the
		     latter includes the trailing period)

	      o	     %p	the process ID of this rsync session

	      o	     %P	the module path

	      o	     %t	the current date time

	      o	     %u	the authenticated username or an empty string

	      o	     %U	the uid	of the file (decimal)

	      For a list of what the characters	mean that are output by	 "%i",
	      see the --itemize-changes	option in the rsync manpage.

	      Note  that  some	of the logged output changes when talking with
	      older rsync versions.  For instance,  deleted  files  were  only
	      output as	verbose	messages prior to rsync	2.6.4.

       timeout
	      This parameter allows you	to override the	clients	choice for I/O
	      timeout for this module. Using this  parameter  you  can	ensure
	      that  rsync  won't wait on a dead	client forever.	The timeout is
	      specified	in seconds. A value of zero means no  timeout  and  is
	      the  default.  A	good choice for	anonymous rsync	daemons	may be
	      600 (giving a 10 minute timeout).

       refuse options
	      This parameter allows you	to specify a space-separated  list  of
	      rsync  command  line  options that will be refused by your rsync
	      daemon.  You may specify the full	option	name,  its  one-letter
	      abbreviation,  or	 a  wild-card string that matches multiple op-
	      tions.  For example, this	would refuse --checksum	(-c)  and  all
	      the various delete options:

		  refuse options = c delete

	      The  reason the above refuses all	delete options is that the op-
	      tions imply --delete, and	implied	options	are refused just  like
	      explicit	options.  As an	additional safety feature, the refusal
	      of "delete" also refuses remove-source-files when	the daemon  is
	      the  sender;  if you want	the latter without the former, instead
	      refuse "delete-*"	-- that	refuses	all the	delete	modes  without
	      affecting	--remove-source-files.

	      When  an	option	is refused, the	daemon prints an error message
	      and exits.  To prevent all compression when serving  files,  you
	      can  use	"dont compress = *" (see below)	instead	of "refuse op-
	      tions = compress"	to avoid returning an error to a  client  that
	      requests compression.

       dont compress
	      This  parameter allows you to select filenames based on wildcard
	      patterns that should not be compressed when pulling  files  from
	      the  daemon (no analogous	parameter exists to govern the pushing
	      of files to a daemon).  Compression is expensive in terms	of CPU
	      usage,  so  it is	usually	good to	not try	to compress files that
	      won't compress well, such	as already compressed files.

	      The "dont	compress" parameter takes a  space-separated  list  of
	      case-insensitive wildcard	patterns. Any source filename matching
	      one of the patterns will not be compressed during	transfer.

	      See the --skip-compress parameter	in the	rsync(1)  manpage  for
	      the  list	 of  file suffixes that	are not	compressed by default.
	      Specifying a value for the "dont compress" parameter changes the
	      default when the daemon is the sender.

       pre-xfer	exec, post-xfer	exec
	      You  may	specify	 a  command  to	be run before and/or after the
	      transfer.	 If the	pre-xfer exec command fails, the  transfer  is
	      aborted  before it begins.  Any output from the script on	stdout
	      (up to several KB) will be displayed to the user when  aborting,
	      but  is NOT displayed if the script returns success.  Any	output
	      from the script on stderr	goes to	the daemon's stderr, which  is
	      typically	discarded (though see --no-detatch option for a	way to
	      see the stderr output, which can assist with debugging).

	      The following environment	variables will be set, though some are
	      specific to the pre-xfer or the post-xfer	environment:

	      o	     RSYNC_MODULE_NAME:	The name of the	module being accessed.

	      o	     RSYNC_MODULE_PATH:	The path configured for	the module.

	      o	     RSYNC_HOST_ADDR: The accessing host's IP address.

	      o	     RSYNC_HOST_NAME: The accessing host's name.

	      o	     RSYNC_USER_NAME:  The  accessing user's name (empty if no
		     user).

	      o	     RSYNC_PID:	A unique number	for this transfer.

	      o	     RSYNC_REQUEST: (pre-xfer only) The	module/path info spec-
		     ified by the user.	 Note that the user can	specify	multi-
		     ple source	files, so the request can  be  something  like
		     "mod/path1	mod/path2", etc.

	      o	     RSYNC_ARG#: (pre-xfer only) The pre-request arguments are
		     set  in  these  numbered  values.	RSYNC_ARG0  is	always
		     "rsyncd",	followed  by  the  options  that  were used in
		     RSYNC_ARG1, and so	on.  There will	be a value of "."  in-
		     dicating  that the	options	are done and the path args are
		     beginning	--  these  contain  similar   information   to
		     RSYNC_REQUEST,  but  with values separated	and the	module
		     name stripped off.

	      o	     RSYNC_EXIT_STATUS:	(post-xfer  only)  the	server	side's
		     exit value.  This will be 0 for a successful run, a posi-
		     tive value	for an error that the server generated,	 or  a
		     -1	 if rsync failed to exit properly.  Note that an error
		     that occurs on the	client side  does  not	currently  get
		     sent  to  the  server side, so this is not	the final exit
		     status for	the whole transfer.

	      o	     RSYNC_RAW_STATUS: (post-xfer only)	 the  raw  exit	 value
		     from waitpid() .

	      Even  though  the	 commands  can be associated with a particular
	      module, they are run using the  permissions  of  the  user  that
	      started  the  daemon  (not the module's uid/gid setting) without
	      any chroot restrictions.

CONFIG DIRECTIVES
       There are currently two config directives available that	allow a	config
       file  to	incorporate the	contents of other files:  &include and &merge.
       Both allow a reference to either	a file or a directory.	They differ in
       how segregated the file's contents are considered to be.

       The &include directive treats each file as more distinct, with each one
       inheriting the defaults of the  parent  file,  starting	the  parameter
       parsing as globals/defaults, and	leaving	the defaults unchanged for the
       parsing of the rest of the parent file.

       The &merge directive, on	the other hand,	treats the file's contents  as
       if  it  were simply inserted in place of	the directive, and thus	it can
       set parameters in a module started in another file, can affect the  de-
       faults for other	files, etc.

       When  an	 &include  or  &merge directive	refers to a directory, it will
       read in all the *.conf or *.inc files (respectively) that are contained
       inside  that directory (without any recursive scanning),	with the files
       sorted into alpha order.	 So, if	you have a directory named  "rsyncd.d"
       with  the  files	"foo.conf", "bar.conf",	and "baz.conf" inside it, this
       directive:

	   &include /path/rsyncd.d

       would be	the same as this set of	directives:

	   &include /path/rsyncd.d/bar.conf
	   &include /path/rsyncd.d/baz.conf
	   &include /path/rsyncd.d/foo.conf

       except that it adjusts as files are added and removed from  the	direc-
       tory.

       The  advantage  of the &include directive is that you can define	one or
       more modules in a  separate  file  without  worrying  about  unintended
       side-effects between the	self-contained module files.

       The advantage of	the &merge directive is	that you can load config snip-
       pets that can be	included into multiple module definitions, and you can
       also  set  global  values  that	will  affect connections (such as motd
       file), or globals that will affect other	include	files.

       For example, this is a useful /usr/local/etc/rsync/rsyncd.conf file:

	   port	= 873
	   log file = /var/log/rsync.log
	   pid file = /var/lock/rsync.lock

	   &merge /usr/local/etc/rsync/rsyncd.d
	   &include /usr/local/etc/rsync/rsyncd.d

       This would merge	 any  /usr/local/etc/rsync/rsyncd.d/*.inc  files  (for
       global  values  that  should  stay  in  effect),	 and  then include any
       /usr/local/etc/rsync/rsyncd.d/*.conf files  (defining  modules  without
       any global-value	cross-talk).

AUTHENTICATION STRENGTH
       The  authentication protocol used in rsync is a 128 bit MD4 based chal-
       lenge response system. This is fairly weak protection, though (with  at
       least one brute-force hash-finding algorithm publicly available), so if
       you want	really top-quality security, then I  recommend	that  you  run
       rsync  over ssh.	 (Yes, a future	version	of rsync will switch over to a
       stronger	hashing	method.)

       Also note that the rsync	daemon protocol	does not currently provide any
       encryption  of  the  data that is transferred over the connection. Only
       authentication is provided. Use ssh as the transport if	you  want  en-
       cryption.

       Future  versions	of rsync may support SSL for better authentication and
       encryption, but that is still being investigated.

EXAMPLES
       A simple	rsyncd.conf file that allow anonymous rsync to a ftp  area  at
       /home/ftp would be:

       [ftp]
	       path = /home/ftp
	       comment = ftp export area

       A more sophisticated example would be:

       uid = nobody
       gid = nobody
       use chroot = yes
       max connections = 4
       syslog facility = local5
       pid file	= /var/run/rsyncd.pid

       [ftp]
	       path = /var/ftp/./pub
	       comment = whole ftp area	(approx	6.1 GB)

       [sambaftp]
	       path = /var/ftp/./pub/samba
	       comment = Samba ftp area	(approx	300 MB)

       [rsyncftp]
	       path = /var/ftp/./pub/rsync
	       comment = rsync ftp area	(approx	6 MB)

       [sambawww]
	       path = /public_html/samba
	       comment = Samba WWW pages (approx 240 MB)

       [cvs]
	       path = /data/cvs
	       comment = CVS repository	(requires authentication)
	       auth users = tridge, susan
	       secrets file = /usr/local/etc/rsync/rsyncd.secrets

       The  /usr/local/etc/rsync/rsyncd.secrets	file would look	something like
       this:

	      tridge:mypass
	      susan:herpass

FILES
       /usr/local/etc/rsync/rsyncd.conf	or rsyncd.conf

SEE ALSO
       rsync(1)

DIAGNOSTICS
BUGS
       Please report  bugs!  The  rsync	 bug  tracking	system	is  online  at
       http://rsync.samba.org/

VERSION
       This man	page is	current	for version 3.1.2 of rsync.

CREDITS
       rsync  is  distributed  under  the GNU General Public License.  See the
       file COPYING for	details.

       The primary ftp site for	rsync is ftp://rsync.samba.org/pub/rsync.

       A WEB site is available at http://rsync.samba.org/

       We would	be delighted to	hear from you if you like this program.

       This program uses the zlib compression  library	written	 by  Jean-loup
       Gailly and Mark Adler.

THANKS
       Thanks  to Warren Stanley for his original idea and patch for the rsync
       daemon. Thanks to Karsten Thygesen for his many suggestions  and	 docu-
       mentation!

AUTHOR
       rsync  was  written by Andrew Tridgell and Paul Mackerras.  Many	people
       have later contributed to it.

       Mailing	lists  for  support   and   development	  are	available   at
       http://lists.samba.org

				  21 Dec 2015			rsyncd.conf(5)

NAME | SYNOPSIS | DESCRIPTION | FILE FORMAT | LAUNCHING THE RSYNC DAEMON | GLOBAL PARAMETERS | MODULE PARAMETERS | CONFIG DIRECTIVES | AUTHENTICATION STRENGTH | EXAMPLES | FILES | SEE ALSO | DIAGNOSTICS | BUGS | VERSION | CREDITS | THANKS | AUTHOR

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