1realmd_selinux(8) SELinux Policy realmd realmd_selinux(8)
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6 realmd_selinux - Security Enhanced Linux Policy for the realmd pro‐
7 cesses
8
10 Security-Enhanced Linux secures the realmd processes via flexible
11 mandatory access control.
12 The realmd processes execute with the realmd_t SELinux type. You can
14 check if you have these processes running by executing the ps command
15 with the -Z qualifier.
16 For example:
18 ps -eZ | grep realmd_t
20
24 The realmd_t SELinux type can be entered via the realmd_exec_t file
25 type.
26 The default entrypoint paths for the realmd_t domain are the following:
28 /usr/libexec/realmd, /usr/lib/realmd/realmd
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32 SELinux defines process types (domains) for each process running on the
33 system
34 You can see the context of a process using the -Z option to ps
36 Policy governs the access confined processes have to files. SELinux
38 realmd policy is very flexible allowing users to setup their realmd
39 processes in as secure a method as possible.
40 The following process types are defined for realmd:
42 realmd_t, realmd_consolehelper_t
44 Note: semanage permissive -a realmd_t can be used to make the process
46 type realmd_t permissive. SELinux does not deny access to permissive
47 process types, but the AVC (SELinux denials) messages are still gener‐
48 ated.
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52 SELinux policy is customizable based on least access required. realmd
53 policy is extremely flexible and has several booleans that allow you to
54 manipulate the policy and run realmd with the tightest access possible.
55 If you want to deny user domains applications to map a memory region as
59 both executable and writable, this is dangerous and the executable
60 should be reported in bugzilla, you must turn on the deny_execmem bool‐
61 ean. Enabled by default.
62 setsebool -P deny_execmem 1
64 If you want to control the ability to mmap a low area of the address
68 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
69 the mmap_low_allowed boolean. Disabled by default.
70 setsebool -P mmap_low_allowed 1
72 If you want to disable kernel module loading, you must turn on the se‐
76 cure_mode_insmod boolean. Enabled by default.
77 setsebool -P secure_mode_insmod 1
79 If you want to allow unconfined executables to make their heap memory
83 executable. Doing this is a really bad idea. Probably indicates a
84 badly coded executable, but could indicate an attack. This executable
85 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
86 echeap boolean. Disabled by default.
87 setsebool -P selinuxuser_execheap 1
89 If you want to allow unconfined executables to make their stack exe‐
93 cutable. This should never, ever be necessary. Probably indicates a
94 badly coded executable, but could indicate an attack. This executable
95 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
96 stack boolean. Enabled by default.
97 setsebool -P selinuxuser_execstack 1
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103 The SELinux process type realmd_t can manage files labeled with the
104 following file types. The paths listed are the default paths for these
105 file types. Note the processes UID still need to have DAC permissions.
106 file_type
108 all files on the system
110
113 SELinux requires files to have an extended attribute to define the file
114 type.
115 You can see the context of a file using the -Z option to ls
117 Policy governs the access confined processes have to these files.
119 SELinux realmd policy is very flexible allowing users to setup their
120 realmd processes in as secure a method as possible.
121 STANDARD FILE CONTEXT
123 SELinux defines the file context types for the realmd, if you wanted to
125 store files with these types in a diffent paths, you need to execute
126 the semanage command to specify alternate labeling and then use re‐
127 storecon to put the labels on disk.
128 semanage fcontext -a -t realmd_var_lib_t '/srv/myrealmd_content(/.*)?'
130 restorecon -R -v /srv/myrealmd_content
131 Note: SELinux often uses regular expressions to specify labels that
133 match multiple files.
134 The following file types are defined for realmd:
136 realmd_exec_t
140 - Set files with the realmd_exec_t type, if you want to transition an
142 executable to the realmd_t domain.
143 Paths:
146 /usr/libexec/realmd, /usr/lib/realmd/realmd
147 realmd_tmp_t
150 - Set files with the realmd_tmp_t type, if you want to store realmd
152 temporary files in the /tmp directories.
153 realmd_var_cache_t
157 - Set files with the realmd_var_cache_t type, if you want to store the
159 files under the /var/cache directory.
160 realmd_var_lib_t
164 - Set files with the realmd_var_lib_t type, if you want to store the
166 realmd files under the /var/lib directory.
167 Note: File context can be temporarily modified with the chcon command.
171 If you want to permanently change the file context you need to use the
172 semanage fcontext command. This will modify the SELinux labeling data‐
173 base. You will need to use restorecon to apply the labels.
174
177 semanage fcontext can also be used to manipulate default file context
178 mappings.
179 semanage permissive can also be used to manipulate whether or not a
181 process type is permissive.
182 semanage module can also be used to enable/disable/install/remove pol‐
184 icy modules.
185 semanage boolean can also be used to manipulate the booleans
187 system-config-selinux is a GUI tool available to customize SELinux pol‐
190 icy settings.
191
194 This manual page was auto-generated using sepolicy manpage .
195
198 selinux(8), realmd(8), semanage(8), restorecon(8), chcon(1), sepol‐
199 icy(8), setsebool(8), realmd_consolehelper_selinux(8)
200realmd 21-11-19 realmd_selinux(8)