1container_selinux(8) SELinux Policy container container_selinux(8)
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6 container_selinux - Security Enhanced Linux Policy for the container
7 processes
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10 Security-Enhanced Linux secures the container processes via flexible
11 mandatory access control.
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13 The container processes execute with the container_t SELinux type. You
14 can check if you have these processes running by executing the ps com‐
15 mand with the -Z qualifier.
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17 For example:
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19 ps -eZ | grep container_t
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24 SELinux defines process types (domains) for each process running on the
25 system
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27 You can see the context of a process using the -Z option to ps
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29 Policy governs the access confined processes have to files. SELinux
30 container policy is very flexible allowing users to setup their con‐
31 tainer processes in as secure a method as possible.
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33 The following process types are defined for container:
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35 container_t
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37 Note: semanage permissive -a container_t can be used to make the
38 process type container_t permissive. SELinux does not deny access to
39 permissive process types, but the AVC (SELinux denials) messages are
40 still generated.
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44 The SELinux process type container_t is an MCS (Multi Category Secu‐
45 rity) constrained type. Sometimes this separation is referred to as
46 sVirt. These types are usually used for securing multi-tenant environ‐
47 ments, such as virtualization, containers or separation of users. The
48 tools used to launch MCS types, pick out a different MCS label for each
49 process group.
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51 For example one process might be launched with container_t:s0:c1,c2,
52 and another process launched with container_t:s0:c3,c4. The SELinux
53 kernel only allows these processes can only write to content with a
54 matching MCS label, or a MCS Label of s0. A process running with the
55 MCS level of s0:c1,c2 is not allowed to write to content with the MCS
56 label of s0:c3,c4
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60 SELinux policy is customizable based on least access required. con‐
61 tainer policy is extremely flexible and has several booleans that allow
62 you to manipulate the policy and run container with the tightest access
63 possible.
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67 If you want to deny any process from ptracing or debugging any other
68 processes, you must turn on the deny_ptrace boolean. Enabled by
69 default.
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71 setsebool -P deny_ptrace 1
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75 If you want to allow all domains to execute in fips_mode, you must turn
76 on the fips_mode boolean. Enabled by default.
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78 setsebool -P fips_mode 1
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83 The SELinux process type container_t can manage files labeled with the
84 following file types. The paths listed are the default paths for these
85 file types. Note the processes UID still need to have DAC permissions.
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87 cephfs_t
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90 cifs_t
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93 container_file_t
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95 /var/lib/rkt/cas(/.*)?
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97 fusefs_t
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99 /var/run/user/[^/]*/gvfs
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101 hugetlbfs_t
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103 /dev/hugepages
104 /usr/lib/udev/devices/hugepages
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106 nfs_t
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109 onload_fs_t
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114 SELinux requires files to have an extended attribute to define the file
115 type.
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117 You can see the context of a file using the -Z option to ls
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119 Policy governs the access confined processes have to these files.
120 SELinux container policy is very flexible allowing users to setup their
121 container processes in as secure a method as possible.
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123 STANDARD FILE CONTEXT
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125 SELinux defines the file context types for the container, if you wanted
126 to store files with these types in a diffent paths, you need to execute
127 the semanage command to sepecify alternate labeling and then use
128 restorecon to put the labels on disk.
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130 semanage fcontext -a -t container_ro_file_t '/srv/mycontainer_con‐
131 tent(/.*)?'
132 restorecon -R -v /srv/mycontainer_content
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134 Note: SELinux often uses regular expressions to specify labels that
135 match multiple files.
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137 The following file types are defined for container:
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141 container_file_t
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143 - Set files with the container_file_t type, if you want to treat the
144 files as container content.
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148 container_ro_file_t
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150 - Set files with the container_ro_file_t type, if you want to treat the
151 files as container ro content.
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155 Note: File context can be temporarily modified with the chcon command.
156 If you want to permanently change the file context you need to use the
157 semanage fcontext command. This will modify the SELinux labeling data‐
158 base. You will need to use restorecon to apply the labels.
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162 semanage fcontext can also be used to manipulate default file context
163 mappings.
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165 semanage permissive can also be used to manipulate whether or not a
166 process type is permissive.
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168 semanage module can also be used to enable/disable/install/remove pol‐
169 icy modules.
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171 semanage boolean can also be used to manipulate the booleans
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174 system-config-selinux is a GUI tool available to customize SELinux pol‐
175 icy settings.
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179 This manual page was auto-generated using sepolicy manpage .
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183 selinux(8), container(8), semanage(8), restorecon(8), chcon(1), sepol‐
184 icy(8), setsebool(8)
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188container 19-05-30 container_selinux(8)