1crack_selinux(8) SELinux Policy crack crack_selinux(8)
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6 crack_selinux - Security Enhanced Linux Policy for the crack processes
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9 Security-Enhanced Linux secures the crack processes via flexible manda‐
10 tory access control.
11 The crack processes execute with the crack_t SELinux type. You can
13 check if you have these processes running by executing the ps command
14 with the -Z qualifier.
15 For example:
17 ps -eZ | grep crack_t
19
23 The crack_t SELinux type can be entered via the crack_exec_t file type.
24 The default entrypoint paths for the crack_t domain are the following:
26 /usr/sbin/crack_[a-z]*, /usr/sbin/cracklib-[a-z]*
28
30 SELinux defines process types (domains) for each process running on the
31 system
32 You can see the context of a process using the -Z option to ps
34 Policy governs the access confined processes have to files. SELinux
36 crack policy is very flexible allowing users to setup their crack pro‐
37 cesses in as secure a method as possible.
38 The following process types are defined for crack:
40 crack_t
42 Note: semanage permissive -a crack_t can be used to make the process
44 type crack_t permissive. SELinux does not deny access to permissive
45 process types, but the AVC (SELinux denials) messages are still gener‐
46 ated.
47
50 SELinux policy is customizable based on least access required. crack
51 policy is extremely flexible and has several booleans that allow you to
52 manipulate the policy and run crack with the tightest access possible.
53 If you want to deny any process from ptracing or debugging any other
57 processes, you must turn on the deny_ptrace boolean. Enabled by
58 default.
59 setsebool -P deny_ptrace 1
61 If you want to allow any process to mmap any file on system with
65 attribute file_type, you must turn on the domain_can_mmap_files bool‐
66 ean. Enabled by default.
67 setsebool -P domain_can_mmap_files 1
69 If you want to allow all domains write to kmsg_device, while kernel is
73 executed with systemd.log_target=kmsg parameter, you must turn on the
74 domain_can_write_kmsg boolean. Disabled by default.
75 setsebool -P domain_can_write_kmsg 1
77 If you want to allow all domains to use other domains file descriptors,
81 you must turn on the domain_fd_use boolean. Enabled by default.
82 setsebool -P domain_fd_use 1
84 If you want to allow all domains to have the kernel load modules, you
88 must turn on the domain_kernel_load_modules boolean. Disabled by
89 default.
90 setsebool -P domain_kernel_load_modules 1
92 If you want to allow all domains to execute in fips_mode, you must turn
96 on the fips_mode boolean. Enabled by default.
97 setsebool -P fips_mode 1
99 If you want to enable reading of urandom for all domains, you must turn
103 on the global_ssp boolean. Disabled by default.
104 setsebool -P global_ssp 1
106
110 The SELinux process type crack_t can manage files labeled with the fol‐
111 lowing file types. The paths listed are the default paths for these
112 file types. Note the processes UID still need to have DAC permissions.
113 crack_db_t
115 /usr/share/cracklib(/.*)?
117 /var/cache/cracklib(/.*)?
118 /usr/lib/cracklib_dict.*
119 crack_tmp_t
121
125 SELinux requires files to have an extended attribute to define the file
126 type.
127 You can see the context of a file using the -Z option to ls
129 Policy governs the access confined processes have to these files.
131 SELinux crack policy is very flexible allowing users to setup their
132 crack processes in as secure a method as possible.
133 STANDARD FILE CONTEXT
135 SELinux defines the file context types for the crack, if you wanted to
137 store files with these types in a diffent paths, you need to execute
138 the semanage command to sepecify alternate labeling and then use
139 restorecon to put the labels on disk.
140 semanage fcontext -a -t crack_tmp_t '/srv/mycrack_content(/.*)?'
142 restorecon -R -v /srv/mycrack_content
143 Note: SELinux often uses regular expressions to specify labels that
145 match multiple files.
146 The following file types are defined for crack:
148 crack_db_t
152 - Set files with the crack_db_t type, if you want to treat the files as
154 crack database content.
155 Paths:
158 /usr/share/cracklib(/.*)?, /var/cache/cracklib(/.*)?,
159 /usr/lib/cracklib_dict.*
160 crack_exec_t
163 - Set files with the crack_exec_t type, if you want to transition an
165 executable to the crack_t domain.
166 Paths:
169 /usr/sbin/crack_[a-z]*, /usr/sbin/cracklib-[a-z]*
170 crack_tmp_t
173 - Set files with the crack_tmp_t type, if you want to store crack tem‐
175 porary files in the /tmp directories.
176 Note: File context can be temporarily modified with the chcon command.
180 If you want to permanently change the file context you need to use the
181 semanage fcontext command. This will modify the SELinux labeling data‐
182 base. You will need to use restorecon to apply the labels.
183
186 semanage fcontext can also be used to manipulate default file context
187 mappings.
188 semanage permissive can also be used to manipulate whether or not a
190 process type is permissive.
191 semanage module can also be used to enable/disable/install/remove pol‐
193 icy modules.
194 semanage boolean can also be used to manipulate the booleans
196 system-config-selinux is a GUI tool available to customize SELinux pol‐
199 icy settings.
200
203 This manual page was auto-generated using sepolicy manpage .
204
207 selinux(8), crack(8), semanage(8), restorecon(8), chcon(1), sepolicy(8)
208 , setsebool(8)
209crack 19-04-25 crack_selinux(8)