WebDAV protocol support

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Distributed authoring and versioning (WebDAV)

WebDAV features:

• Transfer data over HTTPS protocol instead of FTPS one.
• One connection instead of two in FTP.
• Easy to use behind NATs (just one port need to be opened). No incoming port!
• Reuse one connection for a set of transfers.

Setup

• Server requirements:
  • HTTP/HTTPS support.
  • WebDAV HTTP extension support (PUT, GET, DELETE, MKCOL, MOVE, PROPFIND methods) according to the specification (http://www.webdav.org/specs/rfc4918.html).
  • HTTP requests with length up to 64Mb support.
  • Basic authentication method support.
• Supported platform: Windows 2008 R2.
• Apache server configuration:
  • Modules need to be installed, enabled and configured:
    • mod_auth_basic (http://httpd.apache.org/docs/2.2/mod/mod_auth_basic.html);
    • mod_dav (http://httpd.apache.org/docs/2.2/mod/mod_dav.html);
    • mod_dav_lock (http://httpd.apache.org/docs/2.2/mod/mod_dav_lock.html);
    • mod_dav_fs (http://httpd.apache.org/docs/2.2/mod/mod_dav_fs.html);
    • mod_dbd (http://httpd.apache.org/docs/2.1/mod/mod_dbd.html);
    • mod_authn_dbd (http://httpd.apache.org/docs/2.2/mod/mod_authn_dbd.html);
    • mod_ssl (http://httpd.apache.org/docs/2.1/mod/mod_ssl.html).
• IIS server configuration:
  • Authentification methods:
    • Basic Authentication ( http://technet.microsoft.com/en-us/library/cc772009(WS.10).aspx )
  • Extensions:
    • WebDAV Publishing ( http://technet.microsoft.com/en-us/library/dd722682(WS.10).aspx ). Known options:
      • Request Filtering / Request Limits: ( http://weblogs.asp.net/jeffwids/archive/2009/09/24/from-iis6-maxrequestlength-to-iis7-maxallowedcontentlengthfile-specifying-maximum-file-upload-size.aspx ).
      • Max Allowed Content Length - must be > 64Mb:
        • IIS6.0 : maxRequestLength (default: 4Mb);
        • IIS7.x : maxAllowedContentLength (default: 28.6Mb).
      • WebDAV Settings:
        • Require SSL Access - must be True for HTTPS.
  • Links:
    • http://learn.iis.net/page.aspx/350/installing-and-configuring-webdav-on-iis-7/ (use Basic Authentication instead of Windows Authentication in this guide)
• IASO Backup setup.
  • config.ini for BackupFP.

Protocol=WEBDAV[:port=443]  ; using HTTP protocol (without SSL/TLS),
; or
Protocol=WEBDAVS[:port=443] ; using HTTPS protocol (with SSL/TLS)
 
Server=server_address[/path]
; server_address - HTTP server IP address or host name, e.g. iasobackup.com, 157.23.23.32
; path - path part, e.g. /storage

• Provisioning.
  • IIS: like for the FTP.
  • Apache: using MySQL database for the authentification.
• Apache configuration example:

# IASOBackup WebDAV server config sample.
<IfModule !dav_module>
  LoadModule dav_module modules/mod_dav.so
</IfModule>
<IfModule !dav_fs_module>
  LoadModule dav_fs_module modules/mod_dav_fs.so
</IfModule>
<IfModule !dav_lock_module>
  LoadModule dav_lock_module modules/mod_dav_lock.so
</IfModule>
<IfModule !auth_basic_module>
  LoadModule auth_basic_module modules/mod_auth_basic.so
</IfModule>
<IfModule !authz_owner_module>
  LoadModule authz_owner_module modules/mod_authz_owner.so
</IfModule>
<IfModule !dbd_module>
  LoadModule dbd_module modules/mod_dbd.so
  DBDriver mysql
  DBDParams host=localhost,port=8888,user=root,pass=root,dbname=users
</IfModule>
<IfModule !authn_dbd_module>
  LoadModule authn_dbd_module modules/mod_authn_dbd.so
</IfModule>
<IfModule !ssl_module>
  LoadModule ssl_module modules/mod_ssl.so
  SSLRandomSeed startup builtin
  SSLRandomSeed connect builtin
  SSLSessionCache "shmcb:D:/develop/storage/iaso/logs/ssl_scache(512000)"
  SSLSessionCacheTimeout 300
  SSLMutex default
</IfModule>
Listen 443
<VirtualHost _default_:443>
  DocumentRoot "D:/develop/storage/users"
# ServerName 
  SSLEngine on
  SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL
  SSLCertificateFile "D:/develop/storage/iaso/ssl/server.crt"
  SSLCertificateKeyFile "D:/develop/storage/iaso/ssl/server.key"
  DavLockDB "D:/develop/storage/iaso/var/davlock"
  ErrorLog "D:/develop/storage/iaso/logs/error.log"
  TransferLog "D:/develop/storage/iaso/logs/access.log"
  <Directory "D:/develop/storage/users">
    SSLRequireSSL
    Options FollowSymLinks -Indexes
    AllowOverride None
    Order Deny,Allow
    Deny from All
    AuthType Basic
    AuthName IASOBackup-User
#   AuthUserFile "D:/develop/storage/iaso/user.passwd"
    AuthBasicProvider dbd
    AuthDBDUserPWQuery "SELECT Password FROM User WHERE User = %s"
  </Directory>
  <Directory "D:/develop/storage/users/*">
    Dav on
    Order Allow,Deny
    Allow from all
    AllowOverride AuthConfig
  </Directory>
</VirtualHost>

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