rsyncd.conf(5) - phpMan

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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  mod-
       ules.


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 module begins. Modules  con-
       tain parameters of the form "name = value".

       The file is line-based -- that is, each newline-terminated line represents 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.  Internal  whitespace  within a parameter value is
       retained verbatim.

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

       Any line ending in a \ is "continued" on the next line in the customary UNIX  fash-
       ion.

       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.  Other-
       wise, 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 com-
       mand "rsync --daemon" from a suitable startup script.

       When run via inetd you should add a line like this to /etc/services:

         rsync           873/tcp


       and a single line something like this to /etc/inetd.conf:

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


       Replace "/usr/bin/rsync" with the path to where you have rsync  installed  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 connection.


GLOBAL PARAMETERS
       The  first parameters in the file (before a [module] header) are the global parame-
       ters.

       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 parameters.
       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. expand-
       ing 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 command-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  over-
              write  the  file.   This can be overridden by the --dparam=pidfile=FILE com-
              mand-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  speci-
              fying  this value.  This is ignored if the daemon is being run by inetd, and
              is superseded by the --address command-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  setsock-
              opt() 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 listens for con-
              nections.  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 exported 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.

       As  with  GLOBAL PARAMETERS, you may use references to environment variables 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  filesystem  to  make
              available  in  this module.  You must specify this parameter 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 connects.  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  implementation security holes, but it has the
              disadvantages of requiring super-user privileges, of not being able to  fol-
              low 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,   specifying
              "/var/rsync/./module1" will chroot to the "/var/rsync" directory 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 absolute 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  elements  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,  rsync will not attempt to map users and
              groups by name (by default), but instead copy IDs  as  though  --numeric-ids
              had been specified.  In order to enable name-mapping, rsync needs to be able
              to use the standard library functions for looking up  names  and  IDs  (i.e.
              getpwuid()  ,  getgrgid()  , getpwname() , and getgrnam() ).  This means the
              rsync process in the chroot hierarchy  will  need  to  have  access  to  the
              resources  used  by  these  library functions (traditionally /etc/passwd and
              /etc/group, but perhaps additional dynamic libraries as well).

              If you copy the necessary 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 "exclude" (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  the "numeric ids" daemon parameter (see
              below).

              Note also that you are free to setup custom user/group  information  in  the
              chroot  area  that  is  different from your normal system.  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-chroot modules.

              A chroot-enabled module should not have this parameter enabled unless you've
              taken steps to ensure that the module has the necessary resources  it  needs
              to  translate  names, and that it is not possible for a user to change those
              resources.


       munge symlinks
              This parameter tells rsync to modify all symlinks in the  same  way  as  the
              (non-daemon-affecting)  --munge-links  command-line  option  (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-permissions 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 hierarchy).  If you setup an rsync  dae-
              mon  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  symlink'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 module's filenames
              are  stored.   If the client uses an --iconv option, 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 spec-
              ified via "refuse options".

              If  you  wish  to force users to always use --iconv for a particular 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 simultaneous con-
              nections 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-module
              basis instead of globally, the global log will still contain any  authoriza-
              tion 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=log-
              file=FILE command-line options.   The  former  overrides  all  the  log-file
              parameters  of the daemon and all module settings.  The latter sets the dae-
              mon's log file and the default for all the modules, which still allows  mod-
              ules 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, auth-
              priv, cron, daemon, ftp, kern, lpr,  mail,  news,  security,  syslog,  user,
              uucp, local0, local1, local2, 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).


       db config
              This parameter specifies a config file to read that holds connection details
              for a database of checksum information.

              The  config  file  will be read-in prior to any chroot restrictions, but the
              connection occurs from inside the chroot.  This means that you should use  a
              socket  connection (e.g. 127.0.0.1 rather than localhost) for a MySQL config
              from inside a chroot.  For SQLite, the DB file must  be  placed  inside  the
              chroot  (though  it can be placed outside the transfer dir if you configured
              an inside-chroot path).

              See the --db=CONFIG_FILE option for full details.


       db lax This parameter specifies that a "db config" setup should use lax (no  ctime)
              lookups.   See  the  rsync  manpage's  section -n --db-lax for some warnings
              about using this setting.


       max verbosity
              This parameter allows you to control the maximum amount of verbose  informa-
              tion  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
              --debug=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 exceeded 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 dae-
              mon 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 download 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  dis-
              abled.


       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 dae-
              mon  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 default 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 sys-
              tem'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 use-
              ful:

                  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 sup-
              plementary 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 settings).


       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 (daemon-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 administrative 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 prior-
              ity.   Anchored patterns are anchored at the root of the module.  To prevent
              access to an entire subtree, for example, "/secret", you must exclude every-
              thing  in the subtree; the easiest way to do this is with a triple-star pat-
              tern 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 included 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/include.  Only one "exclude" parameter can
              apply to a given module.  See the "filter" parameter for  a  description  of
              how excluded files affect the daemon.


       include
              Use  an  "include" to override the effects of the "exclude" parameter.  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 dae-
              mon exclude patterns, one per line.  Only one "exclude 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 patterns.  Only one
              "include from" parameter can apply to a  given  module.   See  the  "filter"
              parameter for a description of how excluded 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  exist-
              ing  permissions when the client does not specify --perms.  See the descrip-
              tion 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 per-
              missions appear to be different than those stored in the filesystem  itself.
              For  instance, you could disable group write permissions on the server while
              having it appear to be on to  the  clients.   See  the  description  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  authoriza-
              tion  rules.   In  its  simplest  form,  you list the usernames that will be
              allowed to connect to this module. The usernames 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  response  authentication
              protocol  is  used for this exchange. The plain text usernames and passwords
              are stored in the file  specified  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, specifying "@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 options allow  you
              to  "deny" a user or a group, set the access to "ro" (read-only), or set the
              access to "rw" (read/write).  Setting 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 example:

                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 access.  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  pass-
              words  as  well  as  per-group  passwords.   It also explains how a user can
              authenticate using their user password or (when applicable)  a  group  pass-
              word, 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   handle   an
              rsyncd.conf-level username that differs from the remote-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:pass-
              word  and/or  @groupname:password pairs used for authenticating 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 module  is  being
              authorized  using a matching "@groupname" rule.  When that happens, the user
              can be authorized via either their "username:password" line or the  "@group-
              name:password" line for the group that triggered the authentication.

              It  is  up  to you what kind of password entries you want to include, 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  /etc/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 run-
              ning 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 pat-
              terns 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 netmask.  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 normal unix filename matching),  the  client
                     is  allowed  in.  This only works if "reverse lookup" is enabled (the
                     default).

              o      a hostname. A plain hostname is matched against the  reverse  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 enabled, as it is by default).  Any match will be allowed
                     in.


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

                  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 allow" 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  con-
              nect.


       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 speci-
              fied 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 temporary 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-read-
              able  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" parameter.


       log format
              This parameter allows you to specify the format used for logging file trans-
              fers when transfer logging is enabled.  The format is a text string contain-
              ing  embedded  single-character escape sequences prefixed with a percent (%)
              character.  An optional numeric 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 human-readable.  The 3 sup-
              ported levels are the same as for the --human-readable command-line  option,
              though  the default is for human-readability to be off.  Each added apostro-
              phe 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 dae-
              mons 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  options.   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  options  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 options = 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 analo-
              gous parameter exists to govern the pushing of files to a daemon).  Compres-
              sion 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-insensi-
              tive  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 specified by  the
                     user.   Note  that the user can specify multiple 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  "." indicating 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 positive 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 refer-
       ence  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  glob-
       als/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 mod-
       ule started in another file, can affect the defaults 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 directory.

       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 snippets 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 /etc/rsyncd.conf file:

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

           &merge /etc/rsyncd.d
           &include /etc/rsyncd.d


       This would merge any /etc/rsyncd.d/*.inc files (for global values that should  stay
       in effect), and then include any /etc/rsyncd.d/*.conf files (defining modules with-
       out any global-value cross-talk).


AUTHENTICATION STRENGTH
       The authentication protocol used in rsync is a 128 bit MD4 based challenge 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 secu-
       rity,  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 pro-
       vided. Use ssh as the transport if you want encryption.

       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 = /etc/rsyncd.secrets



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

              tridge:mypass
              susan:herpass



FILES
       /etc/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 3.1.1 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 documentation!


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



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