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 de‐
69 fault.
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71 setsebool -P deny_ptrace 1
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76 The SELinux process type container_t can manage files labeled with the
77 following file types. The paths listed are the default paths for these
78 file types. Note the processes UID still need to have DAC permissions.
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80 container_file_t
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82 /var/lib/rkt/cas(/.*)?
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84 fs_t
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87 fusefs_t
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89 /var/run/user/[0-9]+/gvfs
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91 hugetlbfs_t
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93 /dev/hugepages
94 /usr/lib/udev/devices/hugepages
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96 onload_fs_t
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101 SELinux requires files to have an extended attribute to define the file
102 type.
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104 You can see the context of a file using the -Z option to ls
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106 Policy governs the access confined processes have to these files.
107 SELinux container policy is very flexible allowing users to setup their
108 container processes in as secure a method as possible.
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110 STANDARD FILE CONTEXT
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112 SELinux defines the file context types for the container, if you wanted
113 to store files with these types in a diffent paths, you need to execute
114 the semanage command to specify alternate labeling and then use re‐
115 storecon to put the labels on disk.
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117 semanage fcontext -a -t container_ro_file_t '/srv/mycontainer_con‐
118 tent(/.*)?'
119 restorecon -R -v /srv/mycontainer_content
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121 Note: SELinux often uses regular expressions to specify labels that
122 match multiple files.
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124 The following file types are defined for container:
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128 container_file_t
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130 - Set files with the container_file_t type, if you want to treat the
131 files as container content.
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135 container_ro_file_t
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137 - Set files with the container_ro_file_t type, if you want to treat the
138 files as container ro content.
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142 Note: File context can be temporarily modified with the chcon command.
143 If you want to permanently change the file context you need to use the
144 semanage fcontext command. This will modify the SELinux labeling data‐
145 base. You will need to use restorecon to apply the labels.
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149 semanage fcontext can also be used to manipulate default file context
150 mappings.
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152 semanage permissive can also be used to manipulate whether or not a
153 process type is permissive.
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155 semanage module can also be used to enable/disable/install/remove pol‐
156 icy modules.
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158 semanage boolean can also be used to manipulate the booleans
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161 system-config-selinux is a GUI tool available to customize SELinux pol‐
162 icy settings.
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166 This manual page was auto-generated using sepolicy manpage .
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170 selinux(8), container(8), semanage(8), restorecon(8), chcon(1), sepol‐
171 icy(8), setsebool(8)
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175container 23-02-03 container_selinux(8)