[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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[50d8a863] | 12 | <!ENTITY stunnel-md5sum "4246f65d556b9ec51e94f80744ce0eda">
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| 13 | <!ENTITY stunnel-size "864 KB">
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[2d63a2ea] | 14 | <!ENTITY stunnel-buildsize "6.9 MB">
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[4e3dc383] | 15 | <!ENTITY stunnel-time "less than 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 |
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[436c2f7e] | 22 | <title>stunnel-&stunnel-version;</title>
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[d3469f0] | 23 |
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| 24 | <indexterm zone="stunnel">
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[436c2f7e] | 25 | <primary sortas="a-stunnel">stunnel</primary>
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[d3469f0] | 26 | </indexterm>
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| 27 |
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| 28 | <sect2 role="package">
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[436c2f7e] | 29 | <title>Introduction to stunnel</title>
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[d3469f0] | 30 |
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[47274444] | 31 | <para>
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| 32 | The <application>stunnel</application> package contains a program
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| 33 | that allows you to encrypt arbitrary TCP connections inside SSL (Secure
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| 34 | Sockets Layer) so you can easily communicate with clients over secure
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[6b8f495] | 35 | channels. <!--<application>stunnel</application> can be used to add SSL
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[47274444] | 36 | functionality to commonly used <application>Inetd</application> daemons
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| 37 | such as POP-2, POP-3, and IMAP servers, along with standalone daemons
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[6b8f495] | 38 | such as NNTP, SMTP, and HTTP.--> <application>stunnel</application> can
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[47274444] | 39 | also be used to tunnel PPP over network sockets without changes to the
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| 40 | server package source code.
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| 41 | </para>
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[d3469f0] | 42 |
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[fbd04125] | 43 | &lfs120_checked;
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[ee792ef] | 44 |
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[d3469f0] | 45 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 46 | <itemizedlist spacing="compact">
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| 47 | <listitem>
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[47274444] | 48 | <para>
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| 49 | Download (HTTP): <ulink url="&stunnel-download-http;"/>
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| 50 | </para>
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[d3469f0] | 51 | </listitem>
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| 52 | <listitem>
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[47274444] | 53 | <para>
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| 54 | Download (FTP): <ulink url="&stunnel-download-ftp;"/>
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| 55 | </para>
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[d3469f0] | 56 | </listitem>
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| 57 | <listitem>
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[47274444] | 58 | <para>
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| 59 | Download MD5 sum: &stunnel-md5sum;
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| 60 | </para>
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[d3469f0] | 61 | </listitem>
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| 62 | <listitem>
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[47274444] | 63 | <para>
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| 64 | Download size: &stunnel-size;
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| 65 | </para>
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[d3469f0] | 66 | </listitem>
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| 67 | <listitem>
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[47274444] | 68 | <para>
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| 69 | Estimated disk space required: &stunnel-buildsize;
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| 70 | </para>
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[d3469f0] | 71 | </listitem>
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| 72 | <listitem>
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[47274444] | 73 | <para>
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| 74 | Estimated build time: &stunnel-time;
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| 75 | </para>
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[d3469f0] | 76 | </listitem>
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| 77 | </itemizedlist>
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| 78 |
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[436c2f7e] | 79 | <bridgehead renderas="sect3">stunnel Dependencies</bridgehead>
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[658b42d8] | 80 |
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[372898b] | 81 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 82 | <para role="optional">
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[6b8f495] | 83 | <xref linkend="libnsl"/>,
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[17aa21c] | 84 | <ulink url="https://netcat.sourceforge.net/">netcat</ulink>
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[47274444] | 85 | (required for tests),
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[6b7a631] | 86 | <ulink url="http://ftp.porcupine.org/pub/security/index.html">tcpwrappers</ulink>,
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[47274444] | 87 | and
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[15e49d1] | 88 | <ulink url="https://dist.torproject.org/">TOR</ulink>
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[372898b] | 89 | </para>
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[d3469f0] | 90 |
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| 91 | </sect2>
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| 92 |
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| 93 | <sect2 role="installation">
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[436c2f7e] | 94 | <title>Installation of stunnel</title>
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[d3469f0] | 95 |
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[47274444] | 96 | <para>
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| 97 | The <command>stunnel</command> daemon will be run in a
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| 98 | <command>chroot</command> jail by an unprivileged user. Create the
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| 99 | new user and group using the following commands as the
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| 100 | <systemitem class="username">root</systemitem> user:
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| 101 | </para>
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[d3469f0] | 102 |
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[b785ab29] | 103 | <screen role="root"><userinput>groupadd -g 51 stunnel &&
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[436c2f7e] | 104 | useradd -c "stunnel Daemon" -d /var/lib/stunnel \
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[1ae11c9] | 105 | -g stunnel -s /bin/false -u 51 stunnel</userinput></screen>
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[d3469f0] | 106 |
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| 107 | <note>
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[47274444] | 108 | <para>
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| 109 | A signed SSL Certificate and a Private Key is necessary to run the
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| 110 | <command>stunnel</command> daemon. After the package is installed,
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| 111 | there are instructions to generate them. However, if you own or have
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| 112 | already created a signed SSL Certificate you wish to use, copy it to
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| 113 | <filename>/etc/stunnel/stunnel.pem</filename> before starting the
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| 114 | build (ensure only <systemitem class="username">root</systemitem> has
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| 115 | read and write access). The <filename class="extension">.pem</filename>
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| 116 | file must be formatted as shown below:
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| 117 | </para>
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[d3469f0] | 118 |
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[30ca77d2] | 119 | <screen><literal>-----BEGIN PRIVATE KEY-----
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| 120 | <replaceable><many encrypted lines of private key></replaceable>
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| 121 | -----END PRIVATE KEY-----
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[2a7d6c3e] | 122 | -----BEGIN CERTIFICATE-----
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[3597eb6] | 123 | <replaceable><many encrypted lines of certificate></replaceable>
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[30ca77d2] | 124 | -----END CERTIFICATE-----
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| 125 | -----BEGIN DH PARAMETERS-----
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| 126 | <replaceable><encrypted lines of dh parms></replaceable>
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| 127 | -----END DH PARAMETERS-----</literal></screen>
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[47274444] | 128 |
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[d3469f0] | 129 | </note>
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[2a7d6c3e] | 130 |
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[47274444] | 131 | <para>
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| 132 | Install <application>stunnel</application> by running the following
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| 133 | commands:
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| 134 | </para>
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[4a496c3] | 135 |
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[0f870c5] | 136 | <!-- Not needed, we're 10+ versions ahead of this now
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[4efb652] | 137 | <note>
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[47274444] | 138 | <para>
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| 139 | For some systems with <application>binutils</application>
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| 140 | versions prior to 2.25, <command>configure</command> may fail. If
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| 141 | necessary, fix it either with:
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| 142 | </para>
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[4d5c31d] | 143 |
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| 144 | <screen><userinput>sed -i '/LDFLAGS.*static_flag/ s/^/#/' configure</userinput></screen>
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| 145 |
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[47274444] | 146 | <para>
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| 147 | or, if <xref linkend="llvm"/> with Clang is installed, you can
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| 148 | replace <command>./configure ...</command> with <command>CC=clang
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| 149 | ./configure ...</command> in the first command below.
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| 150 | </para>
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[4efb652] | 151 | </note>
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[0f870c5] | 152 | -->
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[d3469f0] | 153 |
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[3c7bd00] | 154 | <screen revision="sysv"><userinput>./configure --prefix=/usr \
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[06b565e] | 155 | --sysconfdir=/etc \
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| 156 | --localstatedir=/var \
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| 157 | --disable-systemd &&
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[d3469f0] | 158 | make</userinput></screen>
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| 159 |
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[3c7bd00] | 160 | <screen revision="systemd"><userinput>./configure --prefix=/usr \
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| 161 | --sysconfdir=/etc \
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| 162 | --localstatedir=/var &&
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| 163 | make</userinput></screen>
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| 164 |
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[47274444] | 165 | <para>
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| 166 | If you have installed the optional netcat application, the
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| 167 | regression tests can be run with <command>make check</command>.
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| 168 | </para>
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[50d61ed] | 169 |
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[47274444] | 170 | <para>
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| 171 | Now, as the <systemitem class="username">root</systemitem> user:
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| 172 | </para>
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[305e60de] | 173 |
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[1ae11c9] | 174 | <screen role="root"><userinput>make docdir=/usr/share/doc/stunnel-&stunnel-version; install</userinput></screen>
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[305e60de] | 175 |
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[f586237] | 176 | <para revision="systemd">
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| 177 | Install the included systemd unit by running the following command as the
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| 178 | <systemitem class="username">root</systemitem> user:
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| 179 | </para>
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| 180 |
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[6a054305] | 181 | <screen role="root" revision="systemd"><userinput>install -v -m644 tools/stunnel.service /usr/lib/systemd/system</userinput></screen>
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[f586237] | 182 |
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[47274444] | 183 | <para>
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| 184 | If you do not already have a signed SSL Certificate and Private Key,
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| 185 | create the <filename>stunnel.pem</filename> file in the
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| 186 | <filename class="directory">/etc/stunnel</filename> directory using the
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| 187 | command below. You will be prompted to enter the necessary
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| 188 | information. Ensure you reply to the
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| 189 | </para>
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[4efb652] | 190 |
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[372898b] | 191 | <screen><prompt>Common Name (FQDN of your server) [localhost]:</prompt></screen>
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| 192 |
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[47274444] | 193 | <para>
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| 194 | prompt with the name or IP address you will be using
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| 195 | to access the service(s).
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| 196 | </para>
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[372898b] | 197 |
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[47274444] | 198 | <para>
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| 199 | To generate a certificate, as the
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| 200 | <systemitem class="username">root</systemitem> user, issue:
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| 201 | </para>
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[372898b] | 202 |
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| 203 | <screen role="root"><userinput>make cert</userinput></screen>
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| 204 |
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[d3469f0] | 205 | </sect2>
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[2a7d6c3e] | 206 |
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[d3469f0] | 207 | <sect2 role="commands">
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| 208 | <title>Command Explanations</title>
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[2a7d6c3e] | 209 |
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[47274444] | 210 | <para revision="sysv">
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| 211 | <parameter>--disable-systemd</parameter>: This switch disables systemd
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| 212 | socket activation support which is not available in BLFS.
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| 213 | </para>
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[06b565e] | 214 |
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[47274444] | 215 | <para>
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| 216 | <command>make docdir=... install</command>: This command installs the
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| 217 | package and changes the documentation installation directory to standard
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| 218 | naming conventions.
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| 219 | </para>
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[2a7d6c3e] | 220 |
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[d3469f0] | 221 | </sect2>
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[2a7d6c3e] | 222 |
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[d3469f0] | 223 | <sect2 role="configuration">
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[436c2f7e] | 224 | <title>Configuring stunnel</title>
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[2a7d6c3e] | 225 |
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[d3469f0] | 226 | <sect3 id="stunnel-config">
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| 227 | <title>Config Files</title>
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[2a7d6c3e] | 228 |
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[47274444] | 229 | <para>
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| 230 | <filename>/etc/stunnel/stunnel.conf</filename>
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| 231 | </para>
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[2a7d6c3e] | 232 |
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[d3469f0] | 233 | <indexterm zone="stunnel stunnel-config">
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| 234 | <primary sortas="e-etc-stunnel-stunnel.conf">/etc/stunnel/stunnel.conf</primary>
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| 235 | </indexterm>
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[2a7d6c3e] | 236 |
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[d3469f0] | 237 | </sect3>
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[2a7d6c3e] | 238 |
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[d3469f0] | 239 | <sect3>
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| 240 | <title>Configuration Information</title>
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| 241 |
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[47274444] | 242 | <para>
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| 243 | As the <systemitem class="username">root</systemitem> user,
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| 244 | create the directory used for the
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| 245 | <filename class="extension">.pid</filename> file created
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| 246 | when the <application>stunnel</application> daemon starts:
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| 247 | </para>
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[1ae11c9] | 248 |
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[8ba08b56] | 249 | <screen role="root"><userinput>install -v -m750 -o stunnel -g stunnel -d /var/lib/stunnel/run &&
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| 250 | chown stunnel:stunnel /var/lib/stunnel</userinput></screen>
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[1ae11c9] | 251 |
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[47274444] | 252 | <para>
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| 253 | Next, create a basic <filename>/etc/stunnel/stunnel.conf</filename>
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| 254 | configuration file using the following commands as the
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| 255 | <systemitem class="username">root</systemitem> user:
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| 256 | </para>
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[d3469f0] | 257 |
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[8558044] | 258 | <screen role="root"><userinput>cat > /etc/stunnel/stunnel.conf << "EOF"
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[1ae11c9] | 259 | <literal>; File: /etc/stunnel/stunnel.conf
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[2a7d6c3e] | 260 |
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[372898b] | 261 | ; Note: The pid and output locations are relative to the chroot location.
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| 262 |
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[1ae11c9] | 263 | pid = /run/stunnel.pid
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[2a7d6c3e] | 264 | chroot = /var/lib/stunnel
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| 265 | client = no
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| 266 | setuid = stunnel
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[30ca77d2] | 267 | setgid = stunnel
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[372898b] | 268 | cert = /etc/stunnel/stunnel.pem
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| 269 |
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| 270 | ;debug = 7
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| 271 | ;output = stunnel.log
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| 272 |
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| 273 | ;[https]
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| 274 | ;accept = 443
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| 275 | ;connect = 80
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| 276 | ;; "TIMEOUTclose = 0" is a workaround for a design flaw in Microsoft SSL
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| 277 | ;; Microsoft implementations do not use SSL close-notify alert and thus
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| 278 | ;; they are vulnerable to truncation attacks
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| 279 | ;TIMEOUTclose = 0</literal>
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[2a7d6c3e] | 280 |
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[bfdd32ae] | 281 | EOF</userinput></screen>
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[2a7d6c3e] | 282 |
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[47274444] | 283 | <para>
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| 284 | Finally, add the service(s) you wish to encrypt to the
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| 285 | configuration file. The format is as follows:
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| 286 | </para>
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[2a7d6c3e] | 287 |
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[3597eb6] | 288 | <screen><literal>[<replaceable><service></replaceable>]
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| 289 | accept = <replaceable><hostname:portnumber></replaceable>
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| 290 | connect = <replaceable><hostname:portnumber></replaceable></literal></screen>
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[d3469f0] | 291 |
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[6b8f495] | 292 | <!--
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[47274444] | 293 | <para>
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| 294 | If you use <application>stunnel</application> to encrypt a daemon
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| 295 | started from <command>[x]inetd</command>, you may need to disable that
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| 296 | daemon in the <filename>/etc/[x]inetd.conf</filename> file and enable a
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| 297 | corresponding <replaceable><service></replaceable>_stunnel
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| 298 | service. You may have to add an appropriate entry in
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| 299 | <filename>/etc/services</filename> as well.
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| 300 | </para>
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[6b8f495] | 301 | -->
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[d3469f0] | 302 |
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[47274444] | 303 | <para>
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| 304 | For a full explanation of the commands and syntax used in the
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| 305 | configuration file, issue <command>man stunnel</command>.
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| 306 | </para>
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[d3469f0] | 307 |
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| 308 | </sect3>
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| 309 |
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| 310 | <sect3 id="stunnel-init">
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[f586237] | 311 | <title><phrase revision="sysv">Boot Script</phrase>
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| 312 | <phrase revision="systemd">Systemd Unit</phrase></title>
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[d3469f0] | 313 |
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[47274444] | 314 | <para revision="sysv">
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| 315 | To automatically start the <command>stunnel</command> daemon when the
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| 316 | system is booted, install the
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| 317 | <filename>/etc/rc.d/init.d/stunnel</filename> bootscript from the
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| 318 | <xref linkend="bootscripts"/> package.
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| 319 | </para>
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[f586237] | 320 |
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[47274444] | 321 | <para revision="systemd">
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| 322 | To start the <command>stunnel</command>
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| 323 | daemon at boot, enable the previously installed
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| 324 | <application>systemd</application> unit by running the following
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| 325 | command as the <systemitem class="username">root</systemitem> user:
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| 326 | </para>
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[d3469f0] | 327 |
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| 328 | <indexterm zone="stunnel stunnel-init">
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| 329 | <primary sortas="f-stunnel">stunnel</primary>
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| 330 | </indexterm>
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| 331 |
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[f586237] | 332 | <screen role="root" revision="sysv"><userinput>make install-stunnel</userinput></screen>
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| 333 |
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| 334 | <screen role="root" revision="systemd"><userinput>systemctl enable stunnel</userinput></screen>
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[d3469f0] | 335 |
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| 336 | </sect3>
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| 337 |
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| 338 | </sect2>
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| 339 |
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| 340 | <sect2 role="content">
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| 341 | <title>Contents</title>
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| 342 |
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| 343 | <segmentedlist>
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| 344 | <segtitle>Installed Programs</segtitle>
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| 345 | <segtitle>Installed Library</segtitle>
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| 346 | <segtitle>Installed Directories</segtitle>
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| 347 |
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| 348 | <seglistitem>
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[49ee8357] | 349 | <seg>
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| 350 | stunnel and stunnel3
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| 351 | </seg>
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| 352 | <seg>
|
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| 353 | libstunnel.so
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| 354 | </seg>
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| 355 | <seg>
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[6b8f495] | 356 | /{etc,lib,var/lib}/stunnel and
|
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[49ee8357] | 357 | /usr/share/doc/stunnel-&stunnel-version;
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| 358 | </seg>
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[d3469f0] | 359 | </seglistitem>
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| 360 | </segmentedlist>
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| 361 |
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| 362 | <variablelist>
|
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| 363 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
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| 364 | <?dbfo list-presentation="list"?>
|
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[869b15ae] | 365 | <?dbhtml list-presentation="table"?>
|
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[d3469f0] | 366 |
|
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| 367 | <varlistentry id="stunnel-prog">
|
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| 368 | <term><command>stunnel</command></term>
|
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| 369 | <listitem>
|
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[47274444] | 370 | <para>
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| 371 | is a program designed to work as an SSL
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| 372 | encryption wrapper between remote clients and local
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[6b8f495] | 373 | or remote servers
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[47274444] | 374 | </para>
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[d3469f0] | 375 | <indexterm zone="stunnel stunnel-prog">
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| 376 | <primary sortas="b-stunnel">stunnel</primary>
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| 377 | </indexterm>
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| 378 | </listitem>
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| 379 | </varlistentry>
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| 380 |
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| 381 | <varlistentry id="stunnel3">
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| 382 | <term><command>stunnel3</command></term>
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| 383 | <listitem>
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[47274444] | 384 | <para>
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| 385 | is a <application>Perl</application> wrapper script to use
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| 386 | <command>stunnel</command> 3.x syntax with
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[4c24eb0a] | 387 | <command>stunnel</command> 4.05 or later
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[47274444] | 388 | </para>
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[d3469f0] | 389 | <indexterm zone="stunnel stunnel3">
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| 390 | <primary sortas="b-stunnel3">stunnel3</primary>
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| 391 | </indexterm>
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| 392 | </listitem>
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| 393 | </varlistentry>
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| 394 |
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| 395 | <varlistentry id="libstunnel">
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[4c24eb0a] | 396 | <term><filename class="libraryfile">libstunnel.so</filename></term>
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[d3469f0] | 397 | <listitem>
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[47274444] | 398 | <para>
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| 399 | contains the API functions required by
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[4c24eb0a] | 400 | <application>stunnel</application>
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[47274444] | 401 | </para>
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[d3469f0] | 402 | <indexterm zone="stunnel libstunnel">
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| 403 | <primary sortas="c-libstunnel">libstunnel.so</primary>
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| 404 | </indexterm>
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| 405 | </listitem>
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| 406 | </varlistentry>
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| 407 |
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| 408 | </variablelist>
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| 409 |
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| 410 | </sect2>
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[2a7d6c3e] | 411 |
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| 412 | </sect1>
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