[ab4fdfc] | 1 | <?xml version="1.0" encoding="UTF-8"?>
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[e79ed72] | 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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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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[8dfc5c3] | 7 | <!ENTITY libcap-download-http "&kernel-dl;/linux/libs/security/linux-privs/libcap2/libcap-&libcap-version;.tar.xz">
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[faa68e4a] | 8 | <!ENTITY libcap-download-ftp " ">
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[313e38a] | 9 | <!ENTITY libcap-md5sum "df0e20c6eeca849347b87d5d6a8870c0">
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[7d90b1b] | 10 | <!ENTITY libcap-size "188 KB">
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| 11 | <!ENTITY libcap-buildsize "2.2 MB">
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[3fa31b47] | 12 | <!ENTITY libcap-time "less than 0.1 SBU">
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[e79ed72] | 13 | ]>
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| 14 |
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[56605b9] | 15 | <sect1 id="libcap-pam" xreflabel="libcap-&libcap-version; with PAM">
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[68876b7] | 16 | <?dbhtml filename="libcap.html"?>
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[e79ed72] | 17 |
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| 18 |
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[56605b9] | 19 | <title>libcap-&libcap-version; with PAM</title>
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[e79ed72] | 20 |
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[56605b9] | 21 | <indexterm zone="libcap-pam">
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| 22 | <primary sortas="a-libcap-pam">libcap</primary>
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[e79ed72] | 23 | </indexterm>
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| 24 |
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| 25 | <sect2 role="package">
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[56605b9] | 26 | <title>Introduction to libcap with PAM</title>
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[e79ed72] | 27 |
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[47274444] | 28 | <para>
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[8558044] | 29 | The <application>libcap</application> package was installed in
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[47274444] | 30 | LFS, but if <application>Linux-PAM</application> support is desired,
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| 31 | the PAM module must be built (after installation of
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| 32 | <application>Linux-PAM</application>).
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| 33 | </para>
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[33c9d33] | 34 |
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[4c0efc3c] | 35 | &lfs122_checked;
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[e79ed72] | 36 |
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| 37 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 38 | <itemizedlist spacing="compact">
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| 39 | <listitem>
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[47274444] | 40 | <para>
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| 41 | Download (HTTP): <ulink url="&libcap-download-http;"/>
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| 42 | </para>
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[e79ed72] | 43 | </listitem>
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| 44 | <listitem>
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[47274444] | 45 | <para>
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| 46 | Download (FTP): <ulink url="&libcap-download-ftp;"/>
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| 47 | </para>
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[e79ed72] | 48 | </listitem>
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| 49 | <listitem>
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[47274444] | 50 | <para>
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| 51 | Download MD5 sum: &libcap-md5sum;
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| 52 | </para>
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[e79ed72] | 53 | </listitem>
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| 54 | <listitem>
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[47274444] | 55 | <para>
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| 56 | Download size: &libcap-size;
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| 57 | </para>
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[e79ed72] | 58 | </listitem>
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| 59 | <listitem>
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[47274444] | 60 | <para>
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| 61 | Estimated disk space required: &libcap-buildsize;
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| 62 | </para>
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[e79ed72] | 63 | </listitem>
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| 64 | <listitem>
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[47274444] | 65 | <para>
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| 66 | Estimated build time: &libcap-time;
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| 67 | </para>
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[e79ed72] | 68 | </listitem>
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| 69 | </itemizedlist>
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| 70 |
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[68876b7] | 71 | <bridgehead renderas="sect3">libcap Dependencies</bridgehead>
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[e79ed72] | 72 |
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| 73 | <bridgehead renderas="sect4">Required</bridgehead>
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[f586237] | 74 | <para role="required">
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| 75 | <xref linkend="linux-pam"/>
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| 76 | </para>
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[03f32bb] | 77 |
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[e79ed72] | 78 |
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| 79 | </sect2>
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| 80 |
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| 81 | <sect2 role="installation">
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[68876b7] | 82 | <title>Installation of libcap</title>
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[e79ed72] | 83 |
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[57b3c45] | 84 | <note>
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[47274444] | 85 | <para>
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| 86 | If you are upgrading libcap from a previous version, use the
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| 87 | instructions in
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[c84d9975] | 88 | <ulink url="&lfs-root;/chapter08/libcap.html">
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[47274444] | 89 | LFS libcap page
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| 90 | </ulink> to upgrade libcap. If <xref linkend="linux-pam"/> has been
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| 91 | built, the PAM module will automatically be built too.
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| 92 | </para>
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[57b3c45] | 93 | </note>
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| 94 |
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[47274444] | 95 | <para>
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| 96 | Install <application>libcap</application> by running the following
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| 97 | commands:
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| 98 | </para>
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[e79ed72] | 99 |
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[f586237] | 100 | <screen><userinput>make -C pam_cap</userinput></screen>
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[e79ed72] | 101 |
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[47274444] | 102 | <para>
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| 103 | This package does not come with a test suite.
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| 104 | </para>
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[5ec4f2b4] | 105 |
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[47274444] | 106 | <para>
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| 107 | Now, as the <systemitem class="username">root</systemitem> user:
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| 108 | </para>
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[e79ed72] | 109 |
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[26a5c21] | 110 | <screen role="root"><userinput>install -v -m755 pam_cap/pam_cap.so /usr/lib/security &&
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[f586237] | 111 | install -v -m644 pam_cap/capability.conf /etc/security</userinput></screen>
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[e79ed72] | 112 |
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| 113 | </sect2>
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| 114 |
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[3706c7fe] | 115 | <sect2 role="configuration">
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| 116 | <title>Configuring Libcap</title>
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| 117 |
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[47274444] | 118 | <para>
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| 119 | In order to allow <application>Linux-PAM</application> to grant
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[2c87187] | 120 | privileges based on POSIX capabilities, you need to add the libcap module
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| 121 | to the beginning of the <filename>/etc/pam.d/system-auth</filename> file.
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[47274444] | 122 | Make the required edits with the following commands:
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| 123 | </para>
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[3706c7fe] | 124 |
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| 125 | <screen role="root"><userinput>mv -v /etc/pam.d/system-auth{,.bak} &&
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| 126 | cat > /etc/pam.d/system-auth << "EOF" &&
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[51dfb3e] | 127 | <literal># Begin /etc/pam.d/system-auth
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[3706c7fe] | 128 |
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[51dfb3e] | 129 | auth optional pam_cap.so</literal>
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[3706c7fe] | 130 | EOF
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[77554c93] | 131 | tail -n +3 /etc/pam.d/system-auth.bak >> /etc/pam.d/system-auth</userinput></screen>
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[3706c7fe] | 132 |
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[47274444] | 133 | <para>
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[2c87187] | 134 | Additionally, you'll need to modify the
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[47274444] | 135 | <filename>/etc/security/capability.conf</filename> file to grant
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| 136 | necessary privileges to users, and utilize the <command>setcap</command>
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| 137 | utility to set capabilities on specific utilities as needed. See
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| 138 | <command>man 8 setcap</command> and
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| 139 | <command>man 3 cap_from_text</command> for additional information.
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| 140 | </para>
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[8558044] | 141 |
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[3706c7fe] | 142 | </sect2>
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| 143 |
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[e79ed72] | 144 | <sect2 role="content">
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| 145 | <title>Contents</title>
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| 146 |
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| 147 | <segmentedlist>
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| 148 | <segtitle>Installed Programs</segtitle>
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[f586237] | 149 | <segtitle>Installed Library</segtitle>
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[e79ed72] | 150 | <segtitle>Installed Directories</segtitle>
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| 151 |
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| 152 | <seglistitem>
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[f586237] | 153 | <seg>None</seg>
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| 154 | <seg>pam_cap.so</seg>
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[e79ed72] | 155 | <seg>None</seg>
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| 156 | </seglistitem>
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| 157 | </segmentedlist>
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| 158 |
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| 159 | </sect2>
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| 160 |
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| 161 | </sect1>
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