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<!DOCTYPE html> <html> <head> <title>ProFTPD module mod_log</title> </head> <body bgcolor=white> <hr> <center> <h2><b>ProFTPD module <code>mod_log</code></b></h2> </center> <hr><br> <p> This module is contained in the <code>mod_log.c</code> file for ProFTPD 1.3.<i>x</i>, and is compiled by default. <h2>Directives</h2> <ul> <li><a href="#AllowLogSymlinks">AllowLogSymlinks</a> <li><a href="#ExtendedLog">ExtendedLog</a> <li><a href="#LogFormat">LogFormat</a> <li><a href="#LogOptions">LogOptions</a> <li><a href="#ServerLog">ServerLog</a> <li><a href="#SystemLog">SystemLog</a> </ul> <hr> <h3><a name="AllowLogSymlinks">AllowLogSymlinks</a></h3> <strong>Syntax:</strong> AllowLogSymlinks <em>on|off</em><br> <strong>Default:</strong> None<br> <strong>Context:</strong> server config, <code><VirtualHost></code>, <code><Global></code><br> <strong>Module:</strong> mod_log<br> <strong>Compatibility:</strong> 1.2.2rc2 and later <p> By default, the server will the path of any configured <a href="#SystemLog"><code>SystemLog</code></a>, any configured <a href="mod_core.html#TransferLog"><code>TransferLog</code></a>s, and any configured <a href="#ExtendedLog"><code>ExtendedLog</code></a>s to see if they are symbolic links. If the paths <i>are</i> symbolic links, <code>proftpd</code> will refuse to log to that link unless explicitly configured to do so via this <code>AllowLogSymlinks</code> directive. <p> <b>Security Note</b>: This behaviour should not be allowed unless for a very good reason. By allowing the server to open symbolic links with its root privileges, you are allowing a potential symlink attack where the server could be tricked into overwriting arbitrary system files. <i>You have been warned.</i> <p> <hr> <h3><a name="ExtendedLog">ExtendedLog</a></h3> <strong>Syntax:</strong> ExtendedLog <em>path [cmd-classes [format-name]]</em><br> <strong>Default:</strong> None<br> <strong>Context:</strong> server config, <code><VirtualHost></code>, <code><Global></code>, <code><Anonymous></code><br> <strong>Module:</strong> mod_log<br> <strong>Compatibility:</strong> 1.1.6p11 and later <p> The <code>ExtendedLog</code> directive allows customizable logfiles to be generated, either globally or per <code><VirtualHost></code>. The <em>path</em> argument should contain an absolute pathname to a logfile which will be appended to when <code>proftpd</code> starts; the pathname should <b>not</b> be to a file in a nonexistent directory, to a world-writable directory, or be a symbolic link (unless <a href="#AllowLogSymlinks"><code>AllowLogSymlinks</code></a> is set to <em>on</em>). Multiple logfiles, potentially with different command classes and formats) can be created. Optionally, the <em>cmd-classes</em> parameter can be used to control which types of commands are logged. If no command classes are specified, <code>proftpd</code> logs all commands by default. <b>Note</b> that passwords are hidden. If used, the <em>cmd-classes</em> parameter is a comma-delimited (with <b>no whitespace</b>) list of which commands to log. <p> In <code>proftpd-1.2.8rc1</code> and later, the <em>path</em> argument can be of the form "syslog:<i>level</i>". The "syslog:" prefix configures <code>mod_log</code> to write the <code>ExtendedLog</code> data to syslog rather than to a file. The <i>level</i> configures the syslog level at which to log the data. For example: <pre> ExtendedLog syslog:info ALL default </pre> <p> This table shows the supported command classes: <p> <table border=1 summary="Command Classes"> <tr> <td><b>Command Class</b></td> <td><b>FTP Commands</b></td> </tr> <tr> <td><code>ALL</code></td> <td>All commands <i>except</i> the <code>EXIT</code> pseudo-command (<i>default</i>)</td> </tr> <tr> <td><code>NONE</code></td> <td>No commands</td> </tr> <tr> <td><code>AUTH</code></td> <td>Authentication commands: <code>ACCT</code>, <code>PASS</code>, <code>REIN</code>, <code>USER</code></td> </tr> <tr> <td><code>INFO</code></td> <td>Informational commands: <code>FEAT</code>, <code>HELP</code>, <code>MDTM</code>, <code>QUIT</code>, <code>PWD</code>, <code>STAT</code>, <code>SIZE</code>, <code>SYST</code>, <code>XPWD</code></td> </tr> <tr> <td><code>DIRS</code></td> <td>Directory commands: <code>CDUP</code>, <code>CWD</code>, <code>LIST</code>, <code>MKD</code>, <code>MLSD</code>, <code>MLST</code>, <code>NLST</code>, <code>RMD</code>, <code>XCWD</code>, <code>XCUP</code>, <code>XMKD</code>, <code>XRMD</code></td> </tr> <tr> <td><code>READ</code></td> <td>File reading: <code>RETR</code></td> </tr> <tr> <td><code>WRITE</code></td> <td>File/directory writing or creation: <code>APPE</code>, <code>MFF</code>, <code>MFMT</code>, <code>MKD</code>, <code>RMD</code>, <code>RNFR</code>, <code>RNTO</code>, <code>STOR</code>, <code>STOU</code>, <code>XMKD</code>, <code>XRMD</code></td> </tr> <tr> <td><code>MISC</code></td> <td>Miscellaneous commands: <code>ABOR</code>, <code>ALLO</code>, <code>EPRT</code>, <code>EPSV</code>, <code>MODE</code>, <code>NOOP</code>, <code>OPTS</code>, <code>PASV</code>, <code>PORT</code>, <code>REST</code>, <code>RNFR</code>, <code>RNTO</code>, <code>SITE</code>, <code>SMNT</code>, <code>STRU</code>, <code>TYPE</code></td> </tr> <tr> <td><code>SEC</code></td> <td>RFC2228-related security FTP commands: <code>AUTH</code>, <code>CCC</code>, <code>PBSZ</code>, <code>PROT</code></td> </tr> <tr> <td><code>EXIT</code></td> <td>Logs the configured <code>LogFormat</code> at session exit.<br> <b>NOTE</b>: <code>EXIT</code> is <b>not</b> part of the <code>ALL</code> command class, in order to preserve backward-compatible <code>ALL</code> behavior.</td> </tr> </table> <p> If a <em>format-name</em> parameter is used, <code>ExtendedLog</code> will use the named <a href="#LogFormat"><code>LogFormat</code></a>. Otherwise, the default format of "%h %l %u %t \"%r\" %s %b" is used. <p> For example, to log all read and write operations to <code>/var/log/ftp.log</code> using the default format, use: <pre> ExtendedLog /var/log/ftp.log READ,WRITE </pre> and to log all read and write operations to <code>/var/log/ftp.log</code> using your own <code>LogFormat</code> named "custom", use: <pre> LogFormat custom ... ExtendedLog /var/log/ftp.log READ,WRITE custom </pre> <p> See also: <a href="#AllowLogSymlinks"><code>AllowLogSymlinks</code></a>, <a href="#LogFormat"><code>LogFormat</code></a>, <a href="mod_core.html#TransferLog"><code>TransferLog</code></a> <p> <hr> <h3><a name="LogFormat">LogFormat</a></h3> <strong>Syntax:</strong> LogFormat <em>format-name format-string</em><br> <strong>Default:</strong> LogFormat default "%h %l %u %t \"%r\" %s %b"<br> <strong>Context:</strong> server config<br> <strong>Module:</strong> mod_log<br> <strong>Compatibility:</strong> 1.1.6p11 and later <p> The <code>LogFormat</code> directive can be used to create a custom logging format for use with the <a href="#ExtendedLog"><code>ExtendedLog</code></a> directive. Once created, the format can be referenced by the specified <em>format-name</em>. The <em>format-string</em> parameter can consist of any combination of letters, numbers and symbols. The special character '%' is used to start a meta sequence/variable (see below). To insert a literal '%' character, use "%%". <p> The default <code>LogFormat</code> is: <pre> "%h %l %u %t \"%r\" %s %b" </pre> which produces log entries in the <a href="http://www.w3.org/Daemon/User/Config/Logging.html#common-logfile-format">Common Log Format</a>. <p> The following meta sequences/variables are available and are replaced as indicated when logging. <p> <table border=1 summary="LogFormat Variables"> <tr> <td><b>Variable</b></td> <td><b>Value</b></td> </tr> <tr> <td> <code>%a</code> </td> <td>Remote client IP address</td> </tr> <tr> <td> <code>%A</code> </td> <td>Anonymous login password, or "UNKNOWN" for regular logins</td> </tr> <tr> <td> <code>%{basename}</code> </td> <td>Last component of path, <i>i.e.</i> just the file or directory name.</td> </tr> <tr> <td> <code>%b</code> </td> <td>Number of bytes sent for this command</td> </tr> <tr> <td> <code>%c</code> </td> <td>Client connection class, or "-" if undefined</td> </tr> <tr> <td> <code>%d</code> </td> <td>Directory name (<i>not</i> full path) for: <code>CDUP</code>, <code>CWD</code>, <code>LIST</code>, <code>MLSD</code>, <code>MKD</code>, <code>NLST</code>, <code>RMD</code>, <code>XCWD</code>, <code>XCUP</code>, <code>XMKD</code>, <code>XRMD</code></td> </tr> <tr> <td> <code>%D</code> </td> <td>Directory path (full path) for: <code>CDUP</code>, <code>CWD</code>, <code>LIST</code>, <code>MLSD</code>, <code>MKD</code>, <code>NLST</code>, <code>RMD</code>, <code>XCWD</code>, <code>XCUP</code>, <code>XMKD</code>, <code>XRMD</code></td> </tr> <tr> <td> <code>%E</code> </td> <td>End-of-session reason</td> </tr> <tr> <td> <code>%{epoch}</code> </td> <td>Unix epoch; seconds since January 1, 1970</td> </tr> <tr> <td> <code>%{<em>NAME</em>}e</code> </td> <td>Contents of environment variable <em>NAME</em></td> </tr> <tr> <td> <code>%f</code> </td> <td>Absolute path of the filename stored or retrieved (not chrooted)</td> </tr> <tr> <td> <code>%F</code> </td> <td>Filename stored or retrieved, as the client sees it</td> </tr> <tr> <td> <code>%{file-modified}</code> </td> <td>Indicates whether a file is modified (<i>i.e.</i> already exists): "true" or "false"</td> </tr> <tr> <td> <code>%{file-size}</code> </td> <td>Indicates the file size <b>after</b> data transfer, or "-" if not applicable</td> </tr> <tr> <td> <code>%{gid}</code> </td> <td>GID of authenticated user</td> </tr> <tr> <td> <code>%g</code> </td> <td>Primary group of authenticated user</td> </tr> <tr> <td> <code>%h</code> </td> <td>Remote client DNS name</td> </tr> <tr> <td> <code>%H</code> </td> <td>Local IP address of vhost/server hosting/handling the session</td> </tr> <tr> <td> <code>%I</code> </td> <td>Total number of "raw" bytes read in from network</td> </tr> <tr> <td> <code>%{iso8601}</code> </td> <td>shorthand form of <code>%{%Y-%m-%d %H:%M:%S}t,%{millisecs}</code>, <i>e.g.</i> "2013-01-30 20:14:05,670"</td> </tr> <tr> <td> <code>%J</code> </td> <td>Command arguments received from client, <i>e.g.</i> "file.txt"</td> </tr> <tr> <td> <code>%l</code> </td> <td>Remote username (from <code>identd</code>), or "UNKNOWN" if IdentLookup failed</td> </tr> <tr> <td> <code>%L</code> </td> <td>Local IP address contacted by client</td> </tr> <tr> <td> <code>%m</code> </td> <td>Command (method) name received from client, <i>e.g.</i> <code>RETR</code></td> </tr> <tr> <td> <code>%{microsecs}</code> </td> <td>6 digit value of the microseconds of the current time</td> </tr> <tr> <td> <code>%{millisecs}</code> </td> <td>3 digit value of the milliseconds of the current time</td> </tr> <tr> <td> <code>%O</code> </td> <td>Total number of "raw" bytes written out to network</td> </tr> <tr> <td> <code>%p</code> </td> <td>Local port</td> </tr> <tr> <td> <code>%P</code> </td> <td>Local server process ID (pid)</td> </tr> <tr> <td> <code>%{protocol}</code> </td> <td>Current protocol: "ftp", "ftps", "ssh2", "sftp", "scp"</td> </tr> <tr> <td> <code>%r</code> </td> <td>Full command received from client</td> </tr> <tr> <td> <code>%R</code> </td> <td>Response time, in milliseconds</td> </tr> <tr> <td> <code>%{remote-port}</code> </td> <td>Remote client port</td> </tr> <tr> <td> <code>%s</code> </td> <td>Numeric FTP response code (status); see <a href="http://www.faqs.org/rfcs/rfc959.html">RFC 959</a> Section 4.2.1</td> </tr> <tr> <td> <code>%S</code> </td> <td>Response message sent to client (available since 1.3.1rc1)</td> </tr> <tr> <td> <code>%t</code> </td> <td>Current local time</td> </tr> <tr> <td> <code>%{<em>format</em>}t</code> </td> <td>Current local time using <code>strftime(3)</code> <em>format</em></td> </tr> <tr> <td> <code>%T</code> </td> <td>Time taken to transfer file, in seconds</td> </tr> <tr> <td> <code>%{transfer-failure}</code> </td> <td>Reason for data transfer failure (if applicable), or "-"</td> </tr> <tr> <td> <code>%{transfer-millisecs}</code> </td> <td>Time taken to transfer file, in milliseconds</td> </tr> <tr> <td> <code>%{transfer-port}</code> </td> <td>Remote port used for data transfer</td> </tr> <tr> <td> <code>%{transfer-status}</code> </td> <td>Status of data transfer: "success", "failed", "cancelled", "timeout", or "-"</td> </tr> <tr> <td> <code>%{transfer-type}</code> </td> <td>Data transfer type: "binary" or "ASCII" (if applicable), or "-"</td> </tr> <tr> <td> <code>%u</code> </td> <td>Authenticated local username</td> </tr> <tr> <td> <code>%U</code> </td> <td><code>USER</code> name originally sent by client</td> </tr> <tr> <td> <code>%{uid}</code> </td> <td>UID of authenticated user</td> </tr> <tr> <td> <code>%v</code> </td> <td>Local server <code>ServerName</code></td> </tr> <tr> <td> <code>%V</code> </td> <td>Local server DNS name</td> </tr> <tr> <td> <code>%{version}</code> </td> <td>ProFTPD version</td> </tr> <tr> <td> <code>%w</code> </td> <td>Absolute path for the <code>RNFR</code> path ("whence" a rename comes)</td> </tr> </table> <p> See also: <a href="#ExtendedLog"><code>ExtendedLog</code></a>, <a href="mod_core.html#TransferLog"><code>TransferLog</code></a> <p> <hr> <h3><a name="LogOptions">LogOptions</a></h3> <strong>Syntax:</strong> LogOptions <em>opt1 ... optN</em><br> <strong>Default:</strong> None<br> <strong>Context:</strong> server config, <VirtualHost>, <Global><br> <strong>Module:</strong> mod_core<br> <strong>Compatibility:</strong> 1.3.7rc4 and later <p> The <code>LogOptions</code> directive can be used to change the format of the <a href="#SystemLog"><code>SystemLog</code></a> messages, <i>e.g.</i> adding/remove certain fields of data. These options <i>also</i> apply to all module logging; ProFTPD logging is centralized, and the <code>LogOptions</code> are applied to any/all logging. <p> The options supported by the <code>LogOptions</code> directive are: <ul> <li>Hostname <li>RoleBasedProcessLabels <li>Timestamp <li>VirtualHost </ul> All of these options are <em>enabled</em> by default, <i>except</i> for the <code>RoleBasedProcessLabels</code> option. <p> To enable an option, preface the option name with a '+' (plus) character; to disable the option, use a '-' (minus) character prefix. For example: <pre> # Log messages without timestamps or hostname LogOptions -Hostname -Timestamp </pre> <p> The <code>RoleBasedProcessLabels</code> option changes the <em>label</em> just for the PID, from <i>e.g.</i>: <pre> proftpd[1234] </pre> to one of the following, depending on whether the process is the master <em>daemon</em> process, or a forked <em>session</em> process: <pre> daemon[2345] session[34567] </pre> This is useful, for example, when relying on <code>systemd</code> logging: <pre> LogOptions -Timestamp -Hostname +RoleBasedProcessLabels </pre> <p> <hr> <h3><a name="ServerLog">ServerLog</a></h3> <strong>Syntax:</strong> ServerLog <em>path</em>|"none"<br> <strong>Default:</strong> None<br> <strong>Context:</strong> server config, <code><VirtualHost></code>, <code><Global></code><br> <strong>Module:</strong> mod_log<br> <strong>Compatibility:</strong> 1.2.8rc1 and later <p> The <code>ServerLog</code> directive is used to configure a <code><VirtualHost></code>-specific logfile at the given <em>path</em>, rather than a single <a href="#SystemLog"><code>SystemLog</code></a> for the entire configuration. <p> A <em>path</em> value of "none" will disable file logging for that vhost; this can be used to override a global <code>ServerLog</code> setting. <p> <hr> <h3><a name="SystemLog">SystemLog</a></h3> <strong>Syntax:</strong> SystemLog <em>path</em>|"none"<br> <strong>Default:</strong> None<br> <strong>Context:</strong> server config<br> <strong>Module:</strong> mod_log<br> <strong>Compatibility:</strong> 1.1.6p11 and later <p> The <code>SystemLog</code> directive disables <code>proftpd</code>'s use of the <code>syslog</code> mechanism and instead redirects all logging output to the specified <em>path</em>. The <em>path</em> should contain an absolute path, and should not be to a file in a nonexistent directory, in a world-writable directory, or be a symbolic link (unless <a href="#AllowLogSymlinks"><code>AllowLogSymlinks</code></a> is set to <em>on</em>). <p> Use of this directive overrides any facility set by the <a href="mod_core.html#SyslogFacility"><code>SyslogFacility</code></a> directive. <p> A <em>path</em> value of "none" will disable logging for the entire daemon. <p> <hr> <h2><a name="Installation">Installation</a></h2> The <code>mod_log</code> module is compiled by default. <p> <hr> <h2><a name="Usage">Usage</a></h2> <p> <p><a name="FAQ"> <b>Frequently Asked Questions</b><br> <p> <font color=red>Question</font>: Why are successful logins no longer being logged, after upgrading to ProFTPD 1.3.6, even though I am using the <code>SystemLog</code> directive?<br> <font color=blue>Answer</font>: The default log level was changed from <code>DEBUG</code> to <code>NOTICE</code> in ProFTPD 1.3.6; see <a href="http://bugs.proftpd.org/show_bug.cgi?id=3983">Bug#3983</a>. And the "Login successful" log message is logged at the <code>INFO</code> level, which means that it will <em>not</em> be logged by default. <p> Why not? The <code>INFO</code> log level is for "normal operating conditions" (see the <a href="../howto/LogLevels.html">log levels</a> howto), and successful logins are considered normal, and thus are not noteworthy or needed for logging. <em>Failed</em> logins, however, <em>are</em> logged at the <code>NOTICE</code> log level. <p> For having successful logins logged once more, use the following in your <code>proftpd.conf</code>: <pre> SyslogLevel INFO </pre> <p> <font color=red>Question</font>: I have configured ProFTPD to use DNS names in my <code>proftpd.conf</code> using: <pre> UseReverseDNS on </pre> But in my <code>ExtendedLog</code>, I still see IP addresses rather than the DNS names I expect to see. How can that happen?<br> <font color=blue>Answer</font>: The <a href="#LogFormat"><code>LogFormat</code></a> <code>%h</code> is what is used to log DNS names. The logged value might be an IP address if ProFTPD cannot properly verify that the client IP address resolves to a DNS name. <p> "Properly verifying" an IP address, in this case, means resolving the DNS name for an IP address <em>and then resolving that DNS name back to its IP addresses</em>: <pre> $ host 10.1.2.3 3.2.1.10.in-addr.arpa domain name pointer host.domain.example.com. $ host host.domain.example.com host.domain.example.com has address 10.4.5.6 </pre> In this example, the IP address 10.1.2.3 does not resolve back to itself via DNS, but rather to a <i>different</i> IP address. <p> If the DNS name does not resolve back to the original IP address, then that DNS name is <b>not used</b>, as that DNS name is considered "unreliable"; only <em>reliable</em> information is logged (and used elsewhere). Thus ProFTPD resorts to logging just the client IP address for the <code>%h</code> variable, rather than the DNS name, in these situations. <p> <font color=red>Question</font>: How can I get the reason a client was disconnected, for whatever reason, logged to my <code>ExtendedLog</code>?<br> <font color=blue>Answer</font>: You can use the <code>%E</code> <a href="#LogFormat"><code>LogFormat</code></a> variable for this, <b>in conjunction with</b> the <code>EXIT</code> log class. <p> For example, assume you have configured the following: <pre> MaxConnectionsPerUser 2 </pre> and you would like your <code>ExtendedLog</code> to record when this limit is reached. To do this, you would use something like the following: <pre> LogFormat eos "%a: user=%U disconnect_reason=\"%E\"" ExtendedLog /var/log/proftpd/ext.log EXIT eos </pre> Of course, you can include other logging classes than just <code>EXIT</code>; the above is just an example. <p> With the above, when the <code>MaxConnectionsPerUser</code> is reached, your log would have a line like: <pre> 127.0.0.1: user=tj disconnect_reason="Denied by MaxConnectionsPerUser" </pre> <p> <hr> <font size=2><b><i> © Copyright 2002-2020 The ProFTPD Project<br> All Rights Reserved<br> </i></b></font> <hr> </body> </html>