[2a7d6c3e] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[2a7d6c3e] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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[43aa464d] | 7 | <!ENTITY stunnel-download-http " ">
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[49ee8357] | 8 | <!-- Following ftp also has older releases -->
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| 9 | <!ENTITY stunnel-download-ftp "ftp://ftp.stunnel.org/stunnel/archive/5.x/stunnel-&stunnel-version;.tar.gz">
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| 10 | <!-- Following ftp only has later release -->
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[a8f943ff] | 11 | <!-- "ftp://ftp.stunnel.org/stunnel/stunnel-&stunnel-version;.tar.gz"> -->
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[e024fe4] | 12 | <!ENTITY stunnel-md5sum "47697dee496c80c8e352b2b705c4a571">
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[72d3b9c] | 13 | <!ENTITY stunnel-size "684 KB">
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| 14 | <!ENTITY stunnel-buildsize "6.2 MB">
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[0bc13d1] | 15 | <!ENTITY stunnel-time "0.1 SBU">
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[2a7d6c3e] | 16 | ]>
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| 17 |
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[436c2f7e] | 18 | <sect1 id="stunnel" xreflabel="stunnel-&stunnel-version;">
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[d3469f0] | 19 | <?dbhtml filename="stunnel.html"?>
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| 20 |
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| 21 | <sect1info>
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| 22 | <othername>$LastChangedBy$</othername>
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| 23 | <date>$Date$</date>
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| 24 | </sect1info>
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| 25 |
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[436c2f7e] | 26 | <title>stunnel-&stunnel-version;</title>
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[d3469f0] | 27 |
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| 28 | <indexterm zone="stunnel">
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[436c2f7e] | 29 | <primary sortas="a-stunnel">stunnel</primary>
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[d3469f0] | 30 | </indexterm>
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| 31 |
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| 32 | <sect2 role="package">
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[436c2f7e] | 33 | <title>Introduction to stunnel</title>
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[d3469f0] | 34 |
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[436c2f7e] | 35 | <para>The <application>stunnel</application> package contains a program
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[d3469f0] | 36 | that allows you to encrypt arbitrary TCP connections inside SSL (Secure
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| 37 | Sockets Layer) so you can easily communicate with clients over secure
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[436c2f7e] | 38 | channels. <application>stunnel</application> can be used to add SSL
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[d3469f0] | 39 | functionality to commonly used <application>Inetd</application> daemons
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[4efb652] | 40 | such as POP-2, POP-3, and IMAP servers, along with standalone daemons such
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| 41 | as NNTP, SMTP, and HTTP. <application>stunnel</application> can also be
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| 42 | used to tunnel PPP over network sockets without changes to the server
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| 43 | package source code.</para>
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[d3469f0] | 44 |
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[ad09e9f5] | 45 | &lfs81_checked;
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[ee792ef] | 46 |
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[d3469f0] | 47 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 48 | <itemizedlist spacing="compact">
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| 49 | <listitem>
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| 50 | <para>Download (HTTP): <ulink url="&stunnel-download-http;"/></para>
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| 51 | </listitem>
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| 52 | <listitem>
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| 53 | <para>Download (FTP): <ulink url="&stunnel-download-ftp;"/></para>
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| 54 | </listitem>
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| 55 | <listitem>
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| 56 | <para>Download MD5 sum: &stunnel-md5sum;</para>
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| 57 | </listitem>
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| 58 | <listitem>
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| 59 | <para>Download size: &stunnel-size;</para>
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| 60 | </listitem>
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| 61 | <listitem>
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| 62 | <para>Estimated disk space required: &stunnel-buildsize;</para>
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| 63 | </listitem>
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| 64 | <listitem>
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| 65 | <para>Estimated build time: &stunnel-time;</para>
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| 66 | </listitem>
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| 67 | </itemizedlist>
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| 68 |
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[436c2f7e] | 69 | <bridgehead renderas="sect3">stunnel Dependencies</bridgehead>
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[94b42903] | 70 | <!--
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[d3469f0] | 71 | <bridgehead renderas="sect4">Required</bridgehead>
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[372898b] | 72 | <para role="required">
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| 73 | <xref linkend="openssl"/>
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| 74 | </para>
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[94b42903] | 75 | -->
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[372898b] | 76 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 77 | <para role="optional">
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[e024fe4] | 78 | <ulink url="http://netcat.sourceforge.net/">netcat</ulink>,
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[15e49d1] | 79 | <ulink url="ftp://ftp.porcupine.org/pub/security/">tcpwrappers</ulink> and
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| 80 | <ulink url="https://dist.torproject.org/">TOR</ulink>
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[372898b] | 81 | </para>
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[d3469f0] | 82 |
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[3597eb6] | 83 | <para condition="html" role="usernotes">User Notes:
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| 84 | <ulink url="&blfs-wiki;/stunnel"/></para>
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| 85 |
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[d3469f0] | 86 | </sect2>
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| 87 |
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| 88 | <sect2 role="installation">
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[436c2f7e] | 89 | <title>Installation of stunnel</title>
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[d3469f0] | 90 |
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| 91 | <para>The <command>stunnel</command> daemon will be run in a
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| 92 | <command>chroot</command> jail by an unprivileged user. Create the
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[1ae11c9] | 93 | new user and group using the following commands as the
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[50d61ed] | 94 | <systemitem class="username">root</systemitem> user:</para>
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[d3469f0] | 95 |
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[b785ab29] | 96 | <screen role="root"><userinput>groupadd -g 51 stunnel &&
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[436c2f7e] | 97 | useradd -c "stunnel Daemon" -d /var/lib/stunnel \
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[1ae11c9] | 98 | -g stunnel -s /bin/false -u 51 stunnel</userinput></screen>
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[d3469f0] | 99 |
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| 100 | <note>
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[372898b] | 101 | <para>A signed SSL Certificate and a Private Key is necessary to run the
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[4efb652] | 102 | <command>stunnel</command> daemon. After the package is installed, there
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| 103 | are instructions to generate them. However, if you own or have already
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| 104 | created a signed SSL Certificate you wish to use, copy it to
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[50d61ed] | 105 | <filename>/etc/stunnel/stunnel.pem</filename> before starting the build
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[8ba08b56] | 106 | (ensure only <systemitem class="username">root</systemitem> has read and
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[372898b] | 107 | write access). The <filename class="extension">.pem</filename> file must
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| 108 | be formatted as shown below:</para>
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[d3469f0] | 109 |
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[30ca77d2] | 110 | <screen><literal>-----BEGIN PRIVATE KEY-----
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| 111 | <replaceable><many encrypted lines of private key></replaceable>
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| 112 | -----END PRIVATE KEY-----
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[2a7d6c3e] | 113 | -----BEGIN CERTIFICATE-----
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[3597eb6] | 114 | <replaceable><many encrypted lines of certificate></replaceable>
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[30ca77d2] | 115 | -----END CERTIFICATE-----
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| 116 | -----BEGIN DH PARAMETERS-----
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| 117 | <replaceable><encrypted lines of dh parms></replaceable>
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| 118 | -----END DH PARAMETERS-----</literal></screen>
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[d3469f0] | 119 | </note>
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[2a7d6c3e] | 120 |
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[4a496c3] | 121 | <para>Install <application>stunnel</application> by running the following
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| 122 | commands:</para>
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| 123 |
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[4efb652] | 124 | <note>
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| 125 | <para>For some systems with <application>binutils</application>
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| 126 | versions prior to 2.25, <command>configure</command> may fail. If
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| 127 | necessary, fix it either with:</para>
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[4d5c31d] | 128 |
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| 129 | <screen><userinput>sed -i '/LDFLAGS.*static_flag/ s/^/#/' configure</userinput></screen>
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| 130 |
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[4efb652] | 131 | <para>or, if <xref linkend="llvm"/> with Clang is installed, you can
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| 132 | replace <command>./configure ...</command> with <command>CC=clang
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| 133 | ./configure ...</command> in the first command below.</para>
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| 134 | </note>
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[d3469f0] | 135 |
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[3c7bd00] | 136 | <screen revision="sysv"><userinput>./configure --prefix=/usr \
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[06b565e] | 137 | --sysconfdir=/etc \
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| 138 | --localstatedir=/var \
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| 139 | --disable-systemd &&
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[d3469f0] | 140 | make</userinput></screen>
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| 141 |
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[3c7bd00] | 142 | <screen revision="systemd"><userinput>./configure --prefix=/usr \
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| 143 | --sysconfdir=/etc \
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| 144 | --localstatedir=/var &&
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| 145 | make</userinput></screen>
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| 146 |
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[e024fe4] | 147 | <para>If you have installed the optional netcat application, the
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| 148 | regression tests can be run with <command>make check</command>.</para>
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[50d61ed] | 149 |
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[d3469f0] | 150 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[305e60de] | 151 |
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[1ae11c9] | 152 | <screen role="root"><userinput>make docdir=/usr/share/doc/stunnel-&stunnel-version; install</userinput></screen>
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[305e60de] | 153 |
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[f586237] | 154 | <para revision="systemd">
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| 155 | Install the included systemd unit by running the following command as the
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| 156 | <systemitem class="username">root</systemitem> user:
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| 157 | </para>
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| 158 |
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| 159 | <screen role="root" revision="systemd"><userinput>install -v -m644 tools/stunnel.service /lib/systemd/system</userinput></screen>
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| 160 |
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[4efb652] | 161 | <para>If you do not already have a signed SSL Certificate and Private Key,
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| 162 | create the <filename>stunnel.pem</filename> file in the
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| 163 | <filename class="directory">/etc/stunnel</filename> directory using the
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| 164 | command below. You will be prompted to enter the necessary
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| 165 | information. Ensure you reply to the</para>
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| 166 |
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[372898b] | 167 | <screen><prompt>Common Name (FQDN of your server) [localhost]:</prompt></screen>
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| 168 |
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| 169 | <para>prompt with the name or IP address you will be using
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| 170 | to access the service(s).</para>
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| 171 |
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[4efb652] | 172 | <para>To generate a certificate, as the
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| 173 | <systemitem class="username">root</systemitem> user, issue:</para>
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[372898b] | 174 |
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| 175 | <screen role="root"><userinput>make cert</userinput></screen>
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| 176 |
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[d3469f0] | 177 | </sect2>
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[2a7d6c3e] | 178 |
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[d3469f0] | 179 | <sect2 role="commands">
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| 180 | <title>Command Explanations</title>
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[2a7d6c3e] | 181 |
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[3c7bd00] | 182 | <para revision="sysv"><parameter>--disable-systemd</parameter>: This switch
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| 183 | disables systemd socket activation support which is not available in
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| 184 | BLFS.</para>
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[06b565e] | 185 |
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[1ae11c9] | 186 | <para><command>make docdir=... install</command>: This command installs the
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[4efb652] | 187 | package and changes the documentation installation directory to standard
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[372898b] | 188 | naming conventions.</para>
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[2a7d6c3e] | 189 |
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[d3469f0] | 190 | </sect2>
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[2a7d6c3e] | 191 |
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[d3469f0] | 192 | <sect2 role="configuration">
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[436c2f7e] | 193 | <title>Configuring stunnel</title>
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[2a7d6c3e] | 194 |
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[d3469f0] | 195 | <sect3 id="stunnel-config">
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| 196 | <title>Config Files</title>
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[2a7d6c3e] | 197 |
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[d3469f0] | 198 | <para><filename>/etc/stunnel/stunnel.conf</filename></para>
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[2a7d6c3e] | 199 |
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[d3469f0] | 200 | <indexterm zone="stunnel stunnel-config">
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| 201 | <primary sortas="e-etc-stunnel-stunnel.conf">/etc/stunnel/stunnel.conf</primary>
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| 202 | </indexterm>
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[2a7d6c3e] | 203 |
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[d3469f0] | 204 | </sect3>
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[2a7d6c3e] | 205 |
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[d3469f0] | 206 | <sect3>
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| 207 | <title>Configuration Information</title>
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| 208 |
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[1ae11c9] | 209 | <para>As the <systemitem class="username">root</systemitem> user,
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| 210 | create the directory used for the
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[4efb652] | 211 | <filename class="extension">.pid</filename> file created
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[436c2f7e] | 212 | when the <application>stunnel</application> daemon starts:</para>
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[1ae11c9] | 213 |
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[8ba08b56] | 214 | <screen role="root"><userinput>install -v -m750 -o stunnel -g stunnel -d /var/lib/stunnel/run &&
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| 215 | chown stunnel:stunnel /var/lib/stunnel</userinput></screen>
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[1ae11c9] | 216 |
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| 217 | <para>Next, create a basic <filename>/etc/stunnel/stunnel.conf</filename>
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| 218 | configuration file using the following commands as the
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| 219 | <systemitem class="username">root</systemitem> user:</para>
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[d3469f0] | 220 |
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[e7670a4] | 221 | <screen role="root"><userinput>cat >/etc/stunnel/stunnel.conf << "EOF"
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[1ae11c9] | 222 | <literal>; File: /etc/stunnel/stunnel.conf
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[2a7d6c3e] | 223 |
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[372898b] | 224 | ; Note: The pid and output locations are relative to the chroot location.
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| 225 |
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[1ae11c9] | 226 | pid = /run/stunnel.pid
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[2a7d6c3e] | 227 | chroot = /var/lib/stunnel
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| 228 | client = no
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| 229 | setuid = stunnel
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[30ca77d2] | 230 | setgid = stunnel
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[372898b] | 231 | cert = /etc/stunnel/stunnel.pem
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| 232 |
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| 233 | ;debug = 7
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| 234 | ;output = stunnel.log
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| 235 |
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| 236 | ;[https]
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| 237 | ;accept = 443
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| 238 | ;connect = 80
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| 239 | ;; "TIMEOUTclose = 0" is a workaround for a design flaw in Microsoft SSL
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| 240 | ;; Microsoft implementations do not use SSL close-notify alert and thus
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| 241 | ;; they are vulnerable to truncation attacks
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| 242 | ;TIMEOUTclose = 0</literal>
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[2a7d6c3e] | 243 |
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[bfdd32ae] | 244 | EOF</userinput></screen>
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[2a7d6c3e] | 245 |
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[4efb652] | 246 | <para>Finally, add the service(s) you wish to encrypt to the
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[1ae11c9] | 247 | configuration file. The format is as follows:</para>
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[2a7d6c3e] | 248 |
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[3597eb6] | 249 | <screen><literal>[<replaceable><service></replaceable>]
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| 250 | accept = <replaceable><hostname:portnumber></replaceable>
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| 251 | connect = <replaceable><hostname:portnumber></replaceable></literal></screen>
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[d3469f0] | 252 |
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[436c2f7e] | 253 | <para>If you use <application>stunnel</application> to encrypt a daemon
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[d3469f0] | 254 | started from <command>[x]inetd</command>, you may need to disable that
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| 255 | daemon in the <filename>/etc/[x]inetd.conf</filename> file and enable a
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[3597eb6] | 256 | corresponding <replaceable><service></replaceable>_stunnel service. You
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[d3469f0] | 257 | may have to add an appropriate entry in <filename>/etc/services</filename>
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| 258 | as well.</para>
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| 259 |
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| 260 | <para>For a full explanation of the commands and syntax used in the
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[4efb652] | 261 | configuration file, issue <command>man stunnel</command>.</para>
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[d3469f0] | 262 |
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| 263 | </sect3>
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| 264 |
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| 265 | <sect3 id="stunnel-init">
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[f586237] | 266 | <title><phrase revision="sysv">Boot Script</phrase>
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| 267 | <phrase revision="systemd">Systemd Unit</phrase></title>
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[d3469f0] | 268 |
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[f586237] | 269 | <para revision="sysv">To automatically start the
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| 270 | <command>stunnel</command> daemon when the system is booted, install the
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[d3469f0] | 271 | <filename>/etc/rc.d/init.d/stunnel</filename> bootscript from the
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[f586237] | 272 | <xref linkend="bootscripts"/> package.</para>
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| 273 |
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| 274 | <para revision="systemd">To start the <command>stunnel</command>
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[45db70f] | 275 | daemon at boot, enable the previously installed
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[f586237] | 276 | <application>systemd</application> unit by running the following command
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| 277 | as the <systemitem class="username">root</systemitem> user:</para>
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[d3469f0] | 278 |
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| 279 | <indexterm zone="stunnel stunnel-init">
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| 280 | <primary sortas="f-stunnel">stunnel</primary>
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| 281 | </indexterm>
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| 282 |
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[f586237] | 283 | <screen role="root" revision="sysv"><userinput>make install-stunnel</userinput></screen>
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| 284 |
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| 285 | <screen role="root" revision="systemd"><userinput>systemctl enable stunnel</userinput></screen>
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[d3469f0] | 286 |
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| 287 | </sect3>
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| 288 |
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| 289 | </sect2>
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| 290 |
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| 291 | <sect2 role="content">
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| 292 | <title>Contents</title>
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| 293 |
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| 294 | <segmentedlist>
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| 295 | <segtitle>Installed Programs</segtitle>
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| 296 | <segtitle>Installed Library</segtitle>
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| 297 | <segtitle>Installed Directories</segtitle>
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| 298 |
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| 299 | <seglistitem>
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[49ee8357] | 300 | <seg>
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| 301 | stunnel and stunnel3
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| 302 | </seg>
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| 303 | <seg>
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| 304 | libstunnel.so
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| 305 | </seg>
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| 306 | <seg>
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[96598583] | 307 | /{etc,usr/lib,var/lib}/stunnel and
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[49ee8357] | 308 | /usr/share/doc/stunnel-&stunnel-version;
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| 309 | </seg>
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[d3469f0] | 310 | </seglistitem>
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| 311 | </segmentedlist>
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| 312 |
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| 313 | <variablelist>
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| 314 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
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| 315 | <?dbfo list-presentation="list"?>
|
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[869b15ae] | 316 | <?dbhtml list-presentation="table"?>
|
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[d3469f0] | 317 |
|
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| 318 | <varlistentry id="stunnel-prog">
|
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| 319 | <term><command>stunnel</command></term>
|
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| 320 | <listitem>
|
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| 321 | <para> is a program designed to work as an SSL
|
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| 322 | encryption wrapper between remote clients and local
|
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[3597eb6] | 323 | (<command>{x}inetd</command>-startable) or remote servers.</para>
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[d3469f0] | 324 | <indexterm zone="stunnel stunnel-prog">
|
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| 325 | <primary sortas="b-stunnel">stunnel</primary>
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| 326 | </indexterm>
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| 327 | </listitem>
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| 328 | </varlistentry>
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| 329 |
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| 330 | <varlistentry id="stunnel3">
|
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| 331 | <term><command>stunnel3</command></term>
|
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| 332 | <listitem>
|
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| 333 | <para>is a <application>Perl</application> wrapper script to use
|
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| 334 | <command>stunnel</command> 3.x syntax with <command>stunnel</command>
|
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| 335 | >=4.05.</para>
|
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| 336 | <indexterm zone="stunnel stunnel3">
|
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| 337 | <primary sortas="b-stunnel3">stunnel3</primary>
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| 338 | </indexterm>
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| 339 | </listitem>
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| 340 | </varlistentry>
|
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| 341 |
|
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| 342 | <varlistentry id="libstunnel">
|
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| 343 | <term><filename class='libraryfile'>libstunnel.so</filename></term>
|
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| 344 | <listitem>
|
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| 345 | <para> contains the API functions required by
|
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[436c2f7e] | 346 | <application>stunnel</application>.</para>
|
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[d3469f0] | 347 | <indexterm zone="stunnel libstunnel">
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| 348 | <primary sortas="c-libstunnel">libstunnel.so</primary>
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| 349 | </indexterm>
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| 350 | </listitem>
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| 351 | </varlistentry>
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| 352 |
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| 353 | </variablelist>
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| 354 |
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| 355 | </sect2>
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[2a7d6c3e] | 356 |
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| 357 | </sect1>
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