1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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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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7 |
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8 | <sect1 id="ch-system-libcap" role="wrap">
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9 | <?dbhtml filename="libcap.html"?>
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10 |
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11 | <sect1info condition="script">
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12 | <productname>libcap</productname>
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13 | <productnumber>&libcap-version;</productnumber>
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14 | <address>&libcap-url;</address>
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15 | </sect1info>
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16 |
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17 | <title>Libcap-&libcap-version;</title>
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18 |
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19 | <indexterm zone="ch-system-libcap">
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20 | <primary sortas="a-Libcap">Libcap</primary>
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21 | </indexterm>
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22 |
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23 | <sect2 role="package">
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24 | <title/>
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25 |
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26 | <para>The Libcap package implements the user-space interfaces to the POSIX
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27 | 1003.1e capabilities available in Linux kernels. These capabilities are a
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28 | partitioning of the all powerful root privilege into a set of distinct
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29 | privileges.</para>
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30 |
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31 | <segmentedlist>
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32 | <segtitle>&buildtime;</segtitle>
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33 | <segtitle>&diskspace;</segtitle>
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34 |
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35 | <seglistitem>
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36 | <seg>&libcap-ch6-sbu;</seg>
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37 | <seg>&libcap-ch6-du;</seg>
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38 | </seglistitem>
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39 | </segmentedlist>
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40 |
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41 | </sect2>
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42 |
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43 | <sect2 role="installation">
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44 | <title>Installation of Libcap</title>
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45 |
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46 | <para>Prevent a static library from being installed:</para>
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47 |
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48 | <screen><userinput remap="pre">sed -i '/install.*STALIBNAME/d' libcap/Makefile</userinput></screen>
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49 |
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50 | <para>Compile the package:</para>
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51 |
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52 | <screen><userinput remap="make">make</userinput></screen>
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53 |
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54 | <para>This package does not come with a test suite.</para>
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55 |
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56 | <para>Install the package:</para>
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57 |
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58 | <screen><userinput remap="install">make RAISE_SETFCAP=no lib=lib prefix=/usr install
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59 | chmod -v 755 /usr/lib/libcap.so.&libcap-version;</userinput></screen>
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60 |
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61 | <variablelist>
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62 | <title>The meaning of the make option:</title>
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63 |
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64 | <varlistentry>
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65 | <term><parameter>RAISE_SETFCAP=no</parameter></term>
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66 | <listitem>
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67 | <para>This parameter skips trying to use <command>setcap</command>
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68 | on itself. This avoids an installation error if the kernel or file
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69 | system does not support extended capabilities.</para>
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70 | </listitem>
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71 | </varlistentry>
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72 |
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73 | <varlistentry>
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74 | <term><parameter>lib=lib</parameter></term>
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75 | <listitem>
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76 | <para>This parameter installs the library in
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77 | <filename>$prefix/lib</filename> rather than
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78 | <filename>$prefix/lib64</filename> on x86_64. It has no effect on
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79 | x86.</para>
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80 | </listitem>
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81 | </varlistentry>
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82 |
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83 | </variablelist>
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84 |
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85 | <para>The shared library needs to be moved to
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86 | <filename class="directory">/lib</filename>, and as a result the
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87 | <filename class="extension">.so</filename> file in
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88 | <filename class="directory">/usr/lib</filename> will need to be recreated:</para>
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89 |
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90 | <screen><userinput remap="install">mv -v /usr/lib/libcap.so.* /lib
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91 | ln -sfv ../../lib/$(readlink /usr/lib/libcap.so) /usr/lib/libcap.so</userinput></screen>
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92 |
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93 | </sect2>
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94 |
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95 | <sect2 arch="ml_32,ml_all" role="installation">
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96 | <title>Installation of Libcap - 32-bit</title>
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97 |
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98 | <para>Clean previous build:</para>
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99 |
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100 | <screen><userinput remap="pre">make distclean</userinput></screen>
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101 |
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102 | <para>Compile the package:</para>
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103 |
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104 | <screen><userinput remap="make">make CC="gcc -m32 -march=i686"</userinput></screen>
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105 |
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106 | <para>Install the package:</para>
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107 |
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108 | <screen><userinput remap="install">make lib=lib32 prefix=$PWD/DESTDIR/usr -C libcap install
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109 | cp -Rv DESTDIR/usr/lib32/* /usr/lib32
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110 | rm -rf DESTDIR</userinput></screen>
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111 |
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112 | </sect2>
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113 |
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114 | <sect2 arch="ml_x32,ml_all" role="installation">
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115 | <title>Installation of Libcap - x32-bit</title>
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116 |
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117 | <para>Clean previous build:</para>
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118 |
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119 | <screen><userinput remap="pre">make distclean</userinput></screen>
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120 |
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121 | <para>Compile the package:</para>
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122 |
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123 | <screen><userinput remap="make">make CC="gcc -mx32"</userinput></screen>
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124 |
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125 | <para>Install the package:</para>
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126 |
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127 | <screen><userinput remap="install">make lib=libx32 prefix=$PWD/DESTDIR/usr -C libcap install
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128 | cp -Rv DESTDIR/usr/libx32/* /usr/libx32
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129 | rm -rf DESTDIR</userinput></screen>
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130 |
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131 | </sect2>
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132 |
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133 | <sect2 id="contents-libcap" role="content">
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134 | <title>Contents of Libcap</title>
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135 |
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136 | <segmentedlist>
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137 | <segtitle>Installed programs</segtitle>
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138 | <segtitle>Installed library</segtitle>
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139 |
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140 | <seglistitem>
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141 | <seg>capsh, getcap, getpcaps, and setcap</seg>
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142 | <seg>libcap.so</seg>
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143 | </seglistitem>
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144 | </segmentedlist>
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145 |
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146 | <variablelist>
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147 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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148 | <?dbfo list-presentation="list"?>
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149 | <?dbhtml list-presentation="table"?>
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150 |
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151 | <varlistentry id="capsh">
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152 | <term><command>capsh</command></term>
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153 | <listitem>
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154 | <para>A shell wrapper to explore and constrain capability support</para>
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155 | <indexterm zone="ch-system-libcap capsh">
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156 | <primary sortas="b-capsh">capsh</primary>
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157 | </indexterm>
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158 | </listitem>
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159 | </varlistentry>
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160 |
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161 | <varlistentry id="getcap">
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162 | <term><command>getcap</command></term>
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163 | <listitem>
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164 | <para>Examines file capabilities</para>
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165 | <indexterm zone="ch-system-libcap getcap">
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166 | <primary sortas="b-getcap">getcap</primary>
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167 | </indexterm>
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168 | </listitem>
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169 | </varlistentry>
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170 |
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171 | <varlistentry id="getpcaps">
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172 | <term><command>getpcaps</command></term>
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173 | <listitem>
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174 | <para>Displays the capabilities on the queried process(es)</para>
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175 | <indexterm zone="ch-system-libcap getpcaps">
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176 | <primary sortas="b-getpcaps">getpcaps</primary>
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177 | </indexterm>
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178 | </listitem>
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179 | </varlistentry>
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180 |
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181 | <varlistentry id="setcap">
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182 | <term><command>setcap</command></term>
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183 | <listitem>
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184 | <para>Sets file capabilities</para>
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185 | <indexterm zone="ch-system-libcap setcap">
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186 | <primary sortas="b-setcap">setcap</primary>
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187 | </indexterm>
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188 | </listitem>
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189 | </varlistentry>
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190 |
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191 | <varlistentry id="libcap">
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192 | <term><filename class="libraryfile">libcap</filename></term>
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193 | <listitem>
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194 | <para>Contains the library functions for manipulating POSIX 1003.1e
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195 | capabilities</para>
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196 | <indexterm zone="ch-system-libcap libcap">
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197 | <primary sortas="c-libcap">libcap</primary>
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198 | </indexterm>
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199 | </listitem>
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200 | </varlistentry>
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201 |
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202 | </variablelist>
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203 |
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204 | </sect2>
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205 |
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206 | </sect1>
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