| 1 | <?xml version="1.0" encoding="iso-8859-1"?>
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| 2 | <!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
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| 3 | <refentry id="vfs_scannedonly.8">
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| 4 |
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| 5 | <refmeta>
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| 6 | <refentrytitle>vfs_scannedonly</refentrytitle>
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| 7 | <manvolnum>8</manvolnum>
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| 8 | <refmiscinfo class="source">Samba</refmiscinfo>
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| 9 | <refmiscinfo class="manual">System Administration tools</refmiscinfo>
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| 10 | <refmiscinfo class="version">3.6</refmiscinfo>
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| 11 | </refmeta>
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| 12 |
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| 13 |
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| 14 | <refnamediv>
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| 15 | <refname>vfs_scannedonly</refname>
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| 16 | <refpurpose>Ensures that only files that have been scanned for viruses are
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| 17 | visible and accessible to the end user.</refpurpose>
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| 18 | </refnamediv>
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| 19 |
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| 20 | <refsynopsisdiv>
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| 21 | <cmdsynopsis>
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| 22 | <command>vfs objects = scannedonly</command>
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| 23 | </cmdsynopsis>
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| 24 | </refsynopsisdiv>
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| 25 |
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| 26 | <refsect1>
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| 27 | <title>DESCRIPTION</title>
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| 28 |
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| 29 | <para>This VFS module is part of the
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| 30 | <citerefentry><refentrytitle>samba</refentrytitle>
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| 31 | <manvolnum>8</manvolnum></citerefentry> suite.</para>
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| 32 |
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| 33 | <para>The <command>vfs_scannedonly</command> VFS module ensures that
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| 34 | only files that have been scanned for viruses are visible and accessible
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| 35 | to the end user. If non-scanned files are found an anti-virus scanning
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| 36 | daemon is notified. The anti-virus scanning daemon is not part of the
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| 37 | Samba suite.
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| 38 | </para>
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| 39 |
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| 40 | <para>Scannedonly comes in two parts: a samba vfs module and (one or
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| 41 | more) daemons. The daemon scans files. If a certain file is clean,
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| 42 | a second file is created with prefix <filename>.scanned:</filename>.
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| 43 | The Samba module simply looks if such a <filename>.scanned:</filename>
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| 44 | file exists, and is newer than the pertinent file. If this is the case,
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| 45 | the file is shown to the user. If this is not the case, the file is not
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| 46 | returned in a directory listing (configurable), and cannot be opened
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| 47 | (configurable). The Samba vfs module will notify the daemon to scan
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| 48 | this file.
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| 49 | </para>
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| 50 |
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| 51 | <para>So what happens for the user in the default configuration. The
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| 52 | first time a directory is listed, it shows files as 'file is being
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| 53 | scanned for viruses, but after the first time all files are shown.
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| 54 | There is a utility scannedonly_prescan that can help you to prescan
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| 55 | all directories. When new files are written the daemon is notified
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| 56 | immediately after the file is complete.
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| 57 | </para>
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| 58 |
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| 59 | <para>If a virus is found by the daemon, a file with a warning message
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| 60 | is created in the directory of the user, a warning is sent to the logs,
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| 61 | and the file is renamed to have prefix <filename>.virus:</filename>.
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| 62 | Files with the <filename>.virus:</filename> prefix are never shown to
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| 63 | the user and all access is denied.
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| 64 | </para>
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| 65 |
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| 66 | <para>This module is stackable.</para>
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| 67 |
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| 68 | </refsect1>
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| 69 |
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| 70 | <refsect1>
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| 71 | <title>CONFIGURATION</title>
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| 72 |
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| 73 | <para><command>vfs_scannedonly</command> relies on a anti-virus scanning
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| 74 | daemon that listens on the scannedonly socket (unix domain socket or UDP
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| 75 | socket).
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| 76 | </para>
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| 77 | </refsect1>
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| 78 |
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| 79 | <refsect1>
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| 80 | <title>OPTIONS</title>
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| 81 |
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| 82 | <variablelist>
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| 83 | <varlistentry>
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| 84 | <term>scannedonly:domain_socket = True </term>
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| 85 | <listitem>
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| 86 | <para>Whether to use a unix domain socket or not (false reverts
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| 87 | to use udp)
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| 88 | </para>
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| 89 | </listitem>
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| 90 | </varlistentry>
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| 91 |
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| 92 | <varlistentry>
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| 93 | <term>scannedonly:socketname = /var/lib/scannedonly/scan</term>
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| 94 | <listitem>
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| 95 | <para>The location of the unix domain socket to connect to</para>
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| 96 | </listitem>
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| 97 | </varlistentry>
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| 98 |
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| 99 | <varlistentry>
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| 100 | <term>scannedonly:portnum = 2020</term>
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| 101 | <listitem>
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| 102 | <para>The udp port number to connect to
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| 103 | </para>
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| 104 | </listitem>
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| 105 | </varlistentry>
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| 106 | <varlistentry><term>scannedonly:scanhost = localhost</term>
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| 107 | <listitem>
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| 108 | <para>
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| 109 | When using UDP the host that runs the scanning daemon (this host
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| 110 | needs access to the files!)
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| 111 | </para>
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| 112 | </listitem>
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| 113 | </varlistentry>
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| 114 | <varlistentry><term>scannedonly:show_special_files = True</term>
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| 115 | <listitem>
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| 116 | <para>
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| 117 | Whether sockets, devices and fifo's (all not scanned for
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| 118 | viruses) should be visible to the user
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| 119 | </para>
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| 120 | </listitem>
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| 121 | </varlistentry>
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| 122 | <varlistentry><term>scannedonly:rm_hidden_files_on_rmdir = True</term>
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| 123 | <listitem>
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| 124 | <para>
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| 125 | Whether files that are not visible (<filename>.scanned:</filename>
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| 126 | files, <filename>.failed:</filename> files and <filename>.virus:
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| 127 | </filename> files) should be deleted if the user tries to remove
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| 128 | the directory. If false, the user will get the "directory is not
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| 129 | empty" error.
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| 130 | </para>
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| 131 | </listitem>
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| 132 | </varlistentry>
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| 133 | <varlistentry><term>scannedonly:hide_nonscanned_files = True</term>
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| 134 | <listitem>
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| 135 | <para>
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| 136 | If false, all non-scanned files are visible in directory listings.
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| 137 | If such files are found in a directory listing the scanning daemon
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| 138 | is notified that scanning is required. Access to non-scanned files
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| 139 | is still denied (see scannedonly:allow_nonscanned_files).
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| 140 | </para>
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| 141 | </listitem>
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| 142 | </varlistentry>
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| 143 | <varlistentry><term>scannedonly:scanning_message = is being scanned for
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| 144 | viruses</term>
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| 145 | <listitem>
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| 146 | <para>
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| 147 | If non-scanned files are hidden
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| 148 | (if scannedonly:hide_nonscanned_files = True), a fake 0 byte file
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| 149 | is shown. The filename is the original filename with the message
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| 150 | as suffix.
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| 151 | </para>
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| 152 | </listitem>
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| 153 | </varlistentry>
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| 154 | <varlistentry><term>scannedonly:recheck_time_open = 50</term>
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| 155 | <listitem>
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| 156 | <para>
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| 157 | If a non-scanned file is opened, the vfs module will wait
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| 158 | recheck_tries_open times for recheck_time_open milliseconds for
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| 159 | the scanning daemon to create a <filename>.scanned:</filename>
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| 160 | file. For small files that are scanned by the daemon within the
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| 161 | time (tries * time) the behavior will be just like on-access
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| 162 | scanning.
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| 163 | </para>
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| 164 | </listitem>
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| 165 | </varlistentry>
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| 166 | <varlistentry><term>scannedonly:recheck_tries_open = 100</term>
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| 167 | <listitem>
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| 168 | <para>
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| 169 | See recheck_time_open.
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| 170 | </para>
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| 171 | </listitem>
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| 172 | </varlistentry>
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| 173 | <varlistentry><term>scannedonly:recheck_time_readdir = 50</term>
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| 174 | <listitem>
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| 175 | <para>
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| 176 | If a non-scanned file is in a directory listing the vfs module
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| 177 | notifies the daemon (once for all files that need scanning in
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| 178 | that directory), and waits recheck_tries_readdir times for
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| 179 | recheck_time_readdir milliseconds. Only used when
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| 180 | hide_nonscanned_files is false.
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| 181 | </para>
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| 182 | </listitem>
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| 183 | </varlistentry>
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| 184 | <varlistentry><term>scannedonly:recheck_tries_readdir = 20</term>
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| 185 | <listitem>
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| 186 | <para>
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| 187 | See recheck_time_readdir.
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| 188 | </para>
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| 189 | </listitem>
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| 190 | </varlistentry>
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| 191 | <varlistentry><term>scannedonly:allow_nonscanned_files = False</term>
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| 192 | <listitem>
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| 193 | <para>
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| 194 | Allow access to non-scanned files. The daemon is notified,
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| 195 | however, and special files such as <filename>.scanned:</filename>
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| 196 | files. <filename>.virus:</filename> files and
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| 197 | <filename>.failed:</filename> files are not listed.
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| 198 | </para>
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| 199 | </listitem>
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| 200 | </varlistentry>
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| 201 |
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| 202 | </variablelist>
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| 203 | </refsect1>
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| 204 |
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| 205 | <refsect1>
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| 206 | <title>EXAMPLES</title>
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| 207 |
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| 208 | <para>Enable anti-virus scanning:</para>
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| 209 | <programlisting>
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| 210 | <smbconfsection name="[homes]"/>
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| 211 | <smbconfoption name="vfs objects">scannedonly</smbconfoption>
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| 212 | <smbconfoption name="scannedonly:hide_nonscanned_files">False</smbconfoption>
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| 213 | </programlisting>
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| 214 |
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| 215 | </refsect1>
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| 216 |
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| 217 | <refsect1>
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| 218 | <title>CAVEATS</title>
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| 219 |
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| 220 | <para>This is not true on-access scanning. However, it is very fast
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| 221 | for files that have been scanned already.
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| 222 | </para>
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| 223 | </refsect1>
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| 224 |
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| 225 | <refsect1>
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| 226 | <title>VERSION</title>
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| 227 |
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| 228 | <para>This man page is correct for version 3.6.0 of the Samba suite.
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| 229 | </para>
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| 230 | </refsect1>
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| 231 |
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| 232 | <refsect1>
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| 233 | <title>AUTHOR</title>
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| 234 |
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| 235 | <para>The original Samba software and related utilities
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| 236 | were created by Andrew Tridgell. Scannedonly was
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| 237 | developed for Samba by Olivier Sessink. Samba is now developed
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| 238 | by the Samba Team as an Open Source project similar
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| 239 | to the way the Linux kernel is developed.</para>
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| 240 |
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| 241 | </refsect1>
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| 242 |
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| 243 | </refentry>
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