mirror of
https://github.com/Zeckmathederg/glfs.git
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329 lines
10 KiB
XML
329 lines
10 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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<!ENTITY vsftpd-download-http "https://security.appspot.com/downloads/vsftpd-&vsftpd-version;.tar.gz">
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<!ENTITY vsftpd-download-ftp " ">
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<!ENTITY vsftpd-md5sum "efbf362a65bec771bc15ad311f5a982e">
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<!ENTITY vsftpd-size "210 KB">
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<!ENTITY vsftpd-buildsize "1.9 MB">
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<!ENTITY vsftpd-time "less than 0.1 SBU">
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<!ENTITY vsftpd-empty "/usr/share/vsftpd/empty">
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]>
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<sect1 id="vsftpd" xreflabel="vsftpd-&vsftpd-version;">
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<?dbhtml filename="vsftpd.html"?>
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<title>vsftpd-&vsftpd-version;</title>
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<indexterm zone="vsftpd">
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<primary sortas="a-vsftpd">vsftpd</primary>
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</indexterm>
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<sect2 role="package">
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<title>Introduction to vsftpd</title>
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<para>
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The <application>vsftpd</application> package contains a very
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secure and very small FTP daemon. This is useful for serving files
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over a network.
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</para>
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&lfs120_checked;
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<bridgehead renderas="sect3">Package Information</bridgehead>
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<itemizedlist spacing="compact">
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<listitem>
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<para>
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Download (HTTP): <ulink url="&vsftpd-download-http;"/>
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</para>
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</listitem>
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<listitem>
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<para>
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Download (FTP): <ulink url="&vsftpd-download-ftp;"/>
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</para>
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</listitem>
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<listitem>
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<para>
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Download MD5 sum: &vsftpd-md5sum;
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</para>
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</listitem>
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<listitem>
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<para>
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Download size: &vsftpd-size;
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</para>
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</listitem>
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<listitem>
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<para>
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Estimated disk space required: &vsftpd-buildsize;
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</para>
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</listitem>
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<listitem>
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<para>
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Estimated build time: &vsftpd-time;
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</para>
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</listitem>
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</itemizedlist>
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<bridgehead renderas="sect3">vsftpd Dependencies</bridgehead>
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<bridgehead renderas="sect4">Required</bridgehead>
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<para role="required">
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<xref linkend="libnsl"/>
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</para>
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<bridgehead renderas="sect4">Recommended</bridgehead>
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<para role="recommended">
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<xref linkend="linux-pam"/>
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</para>
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<bridgehead renderas="sect4">Optional</bridgehead>
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<para role="optional">
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<xref linkend="libcap-pam"/>
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</para>
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</sect2>
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<sect2 role="installation">
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<title>Installation of vsftpd</title>
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<para>
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For security reasons, running <application>vsftpd</application>
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as an unprivileged user and group is encouraged. Also, a user should be
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created to map anonymous users. As the <systemitem
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class="username">root</systemitem> user, create the needed directories,
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users, and groups with the following commands:
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</para>
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<screen role="root"><userinput>install -v -d -m 0755 &vsftpd-empty; &&
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install -v -d -m 0755 /home/ftp &&
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groupadd -g 47 vsftpd &&
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groupadd -g 45 ftp &&
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useradd -c "vsftpd User" -d /dev/null -g vsftpd -s /bin/false -u 47 vsftpd &&
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useradd -c anonymous_user -d /home/ftp -g ftp -s /bin/false -u 45 ftp</userinput></screen>
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<para>
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Gcc-10 and later flags an error for an implicit type cast. Make it
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explicit:
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</para>
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<screen><userinput>sed -e "s/kVSFSysStrOpenUnknown;/(enum EVSFSysUtilOpenMode)&/" -i sysstr.c</userinput></screen>
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<para>
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Build <application>vsftpd</application> as an unprivileged user
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using the following command:
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</para>
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<screen><userinput>make</userinput></screen>
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<para>
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This package does not come with a test suite.
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</para>
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<para>
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Once again, become the <systemitem class="username">root</systemitem>
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user and install <application>vsftpd</application> with the following
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commands:
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</para>
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<screen role="root"><userinput>install -v -m 755 vsftpd /usr/sbin/vsftpd &&
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install -v -m 644 vsftpd.8 /usr/share/man/man8 &&
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install -v -m 644 vsftpd.conf.5 /usr/share/man/man5 &&
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install -v -m 644 vsftpd.conf /etc</userinput></screen>
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</sect2>
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<sect2 role="commands">
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<title>Command Explanations</title>
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<para>
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<command>install -v -d ...</command>: This creates the
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directory that anonymous users will use (<filename
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class='directory'>/home/ftp</filename>)
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and the directory the daemon will chroot into
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(<filename class='directory'>&vsftpd-empty;</filename>).
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</para>
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<note>
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<para>
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<filename class="directory">/home/ftp</filename> should not be
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owned by the user <systemitem class="username">vsftpd</systemitem>,
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or the user <systemitem class="username">ftp</systemitem>.
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</para>
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</note>
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<para>
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<command>echo "#define VSF_BUILD_TCPWRAPPERS" >>builddefs.h</command>:
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Use this prior to <command>make</command> to add support for
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<application>tcpwrappers</application>.
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</para>
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<para>
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<command>echo "#define VSF_BUILD_SSL" >>builddefs.h</command>:
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Use this prior to <command>make</command> to add support for SSL.
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</para>
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<para>
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<command>install -v -m ...</command>:
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The <filename>Makefile</filename> uses non-standard installation paths.
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These commands install the files in
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<filename class='directory'>/usr</filename> and
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<filename class='directory'>/etc</filename>.
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</para>
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</sect2>
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<sect2 role="configuration">
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<title>Configuring vsftpd</title>
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<sect3 id="vsftpd-config">
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<title>Config Files</title>
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<para>
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<filename>/etc/vsftpd.conf</filename>
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</para>
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<indexterm zone="vsftpd vsftpd-config">
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<primary sortas="e-etc-vsftpd.conf">/etc/vsftpd.conf</primary>
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</indexterm>
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</sect3>
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<sect3>
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<title>Configuration Information</title>
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<para>
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<application>vsftpd</application> comes with a basic
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anonymous-only configuration file that was copied to
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<filename class='directory'>/etc</filename> above. While still as
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<systemitem class="username">root</systemitem>, this file should be
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modified because it is now recommended to run <command>vsftpd</command>
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in standalone mode. Also, you
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should specify the privilege separation user created above. Finally,
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you should specify the <command>chroot</command> directory.
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<command>man vsftpd.conf</command> will give you all the details.
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</para>
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<screen role="root"><userinput>cat >> /etc/vsftpd.conf << "EOF"
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<literal>background=YES
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nopriv_user=vsftpd
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secure_chroot_dir=&vsftpd-empty;</literal>
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EOF</userinput></screen>
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<!-- recheck this issue when vsftpd is updated -->
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<!-- Aug'23: Cannot see any difference in behavior of vsftpd
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when that option is set or not
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<para>
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The vsftpd daemon uses seccomp to improve security by default.
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But it's known to cause vsftpd unable to handle ftp
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<literal>LIST</literal> command with recent kernel versions. Append
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a line to <filename>/etc/vsftpd.conf</filename> (as the
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<systemitem class="username">root</systemitem> user) to disable
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seccomp and workaround this issue:
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</para>
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<screen role="root"><userinput>cat >> /etc/vsftpd.conf << "EOF"
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<literal>seccomp_sandbox=NO</literal>
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EOF</userinput></screen>
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-->
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<para>
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To enable local logins, append the following to the
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<filename>/etc/vsftpd.conf</filename> file (as the
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<systemitem class="username">root</systemitem> user):
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</para>
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<screen role="root"><userinput>cat >> /etc/vsftpd.conf << "EOF"
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<literal>local_enable=YES</literal>
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EOF</userinput></screen>
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<para>
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In addition, if using <application>Linux-PAM</application> and
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<application>vsftpd</application> with local user logins, you will need
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a <application>Linux-PAM</application> configuration file. As the
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<systemitem class="username">root</systemitem> user, create the
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<filename>/etc/pam.d/vsftpd</filename> file, and add the needed
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configuration changes for <application>Linux-PAM</application> session
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support using the following commands:
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</para>
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<screen role="root"><userinput>cat > /etc/pam.d/vsftpd << "EOF" &&
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<literal># Begin /etc/pam.d/vsftpd
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auth required /lib/security/pam_listfile.so item=user sense=deny \
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file=/etc/ftpusers \
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onerr=succeed
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auth required pam_shells.so
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auth include system-auth
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account include system-account
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session include system-session</literal>
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EOF
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cat >> /etc/vsftpd.conf << "EOF"
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<literal>session_support=YES
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pam_service_name=vsftpd</literal>
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EOF</userinput></screen>
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</sect3>
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<sect3 id="vsftpd-init">
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<title><phrase revision="sysv">Boot Script</phrase>
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<phrase revision="systemd">Systemd Unit</phrase></title>
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<para>
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Install the
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<phrase revision="sysv"><filename>/etc/rc.d/init.d/vsftpd</filename>
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init script</phrase>
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<phrase revision="systemd"><filename>vsftpd.service</filename>
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unit</phrase> included in the
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<xref linkend="bootscripts" revision="sysv"/>
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<xref linkend="systemd-units" revision="systemd"/> package:
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</para>
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<screen role="root"><userinput>make install-vsftpd</userinput></screen>
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</sect3>
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</sect2>
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<sect2 role="content">
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<title>Contents</title>
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<segmentedlist>
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<segtitle>Installed Program</segtitle>
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<segtitle>Installed Libraries</segtitle>
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<segtitle>Installed Directories</segtitle>
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<seglistitem>
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<seg>vsftpd</seg>
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<seg>None</seg>
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<seg>/usr/share/vsftpd, /home/ftp</seg>
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</seglistitem>
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</segmentedlist>
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<variablelist>
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<bridgehead renderas="sect3">Short Descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<?dbhtml list-presentation="table"?>
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<varlistentry id="vsftpd-prog">
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<term><command>vsftpd</command></term>
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<listitem>
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<para>
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is the FTP daemon
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</para>
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<indexterm zone="vsftpd vsftpd-prog">
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<primary sortas="b-vsftpd">vsftpd</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect2>
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</sect1>
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