1cloud_init_selinux(8) SELinux Policy cloud_init cloud_init_selinux(8)
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6 cloud_init_selinux - Security Enhanced Linux Policy for the cloud_init
7 processes
8
10 Security-Enhanced Linux secures the cloud_init processes via flexible
11 mandatory access control.
12 The cloud_init processes execute with the cloud_init_t SELinux type.
14 You can check if you have these processes running by executing the ps
15 command with the -Z qualifier.
16 For example:
18 ps -eZ | grep cloud_init_t
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24 The cloud_init_t SELinux type can be entered via the cloud_init_exec_t
25 file type.
26 The default entrypoint paths for the cloud_init_t domain are the fol‐
28 lowing:
29 /usr/lib/systemd/system-generators/cloud-init.*, /usr/bin/cloud-init,
31 /usr/libexec/min-cloud-agent, /usr/libexec/min-metadata-service
32
34 SELinux defines process types (domains) for each process running on the
35 system
36 You can see the context of a process using the -Z option to ps
38 Policy governs the access confined processes have to files. SELinux
40 cloud_init policy is very flexible allowing users to setup their
41 cloud_init processes in as secure a method as possible.
42 The following process types are defined for cloud_init:
44 cloud_init_t
46 Note: semanage permissive -a cloud_init_t can be used to make the
48 process type cloud_init_t permissive. SELinux does not deny access to
49 permissive process types, but the AVC (SELinux denials) messages are
50 still generated.
51
54 SELinux policy is customizable based on least access required.
55 cloud_init policy is extremely flexible and has several booleans that
56 allow you to manipulate the policy and run cloud_init with the tightest
57 access possible.
58 If you want to deny user domains applications to map a memory region as
62 both executable and writable, this is dangerous and the executable
63 should be reported in bugzilla, you must turn on the deny_execmem bool‐
64 ean. Enabled by default.
65 setsebool -P deny_execmem 1
67 If you want to control the ability to mmap a low area of the address
71 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
72 the mmap_low_allowed boolean. Disabled by default.
73 setsebool -P mmap_low_allowed 1
75 If you want to disable kernel module loading, you must turn on the se‐
79 cure_mode_insmod boolean. Enabled by default.
80 setsebool -P secure_mode_insmod 1
82 If you want to allow unconfined executables to make their heap memory
86 executable. Doing this is a really bad idea. Probably indicates a
87 badly coded executable, but could indicate an attack. This executable
88 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
89 echeap boolean. Disabled by default.
90 setsebool -P selinuxuser_execheap 1
92 If you want to allow unconfined executables to make their stack exe‐
96 cutable. This should never, ever be necessary. Probably indicates a
97 badly coded executable, but could indicate an attack. This executable
98 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
99 stack boolean. Enabled by default.
100 setsebool -P selinuxuser_execstack 1
102
106 The SELinux process type cloud_init_t can manage files labeled with the
107 following file types. The paths listed are the default paths for these
108 file types. Note the processes UID still need to have DAC permissions.
109 file_type
111 all files on the system
113
116 SELinux requires files to have an extended attribute to define the file
117 type.
118 You can see the context of a file using the -Z option to ls
120 Policy governs the access confined processes have to these files.
122 SELinux cloud_init policy is very flexible allowing users to setup
123 their cloud_init processes in as secure a method as possible.
124 STANDARD FILE CONTEXT
126 SELinux defines the file context types for the cloud_init, if you
128 wanted to store files with these types in a diffent paths, you need to
129 execute the semanage command to specify alternate labeling and then use
130 restorecon to put the labels on disk.
131 semanage fcontext -a -t cloud_init_unit_file_t '/srv/mycloud_init_con‐
133 tent(/.*)?'
134 restorecon -R -v /srv/mycloud_init_content
135 Note: SELinux often uses regular expressions to specify labels that
137 match multiple files.
138 The following file types are defined for cloud_init:
140 cloud_init_exec_t
144 - Set files with the cloud_init_exec_t type, if you want to transition
146 an executable to the cloud_init_t domain.
147 Paths:
150 /usr/lib/systemd/system-generators/cloud-init.*, /usr/bin/cloud-
151 init, /usr/libexec/min-cloud-agent, /usr/libexec/min-metadata-ser‐
152 vice
153 cloud_init_tmp_t
156 - Set files with the cloud_init_tmp_t type, if you want to store cloud
158 init temporary files in the /tmp directories.
159 cloud_init_unit_file_t
163 - Set files with the cloud_init_unit_file_t type, if you want to treat
165 the files as cloud init unit content.
166 Paths:
169 /usr/lib/systemd/system/cloud-init.*, /usr/lib/systemd/sys‐
170 tem/cloud-config.*
171 Note: File context can be temporarily modified with the chcon command.
174 If you want to permanently change the file context you need to use the
175 semanage fcontext command. This will modify the SELinux labeling data‐
176 base. You will need to use restorecon to apply the labels.
177
180 semanage fcontext can also be used to manipulate default file context
181 mappings.
182 semanage permissive can also be used to manipulate whether or not a
184 process type is permissive.
185 semanage module can also be used to enable/disable/install/remove pol‐
187 icy modules.
188 semanage boolean can also be used to manipulate the booleans
190 system-config-selinux is a GUI tool available to customize SELinux pol‐
193 icy settings.
194
197 This manual page was auto-generated using sepolicy manpage .
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201 selinux(8), cloud_init(8), semanage(8), restorecon(8), chcon(1), sepol‐
202 icy(8), setsebool(8)
203cloud_init 21-11-19 cloud_init_selinux(8)