1svirt_tcg_selinux(8) SELinux Policy svirt_tcg svirt_tcg_selinux(8)
2
6 svirt_tcg_selinux - Security Enhanced Linux Policy for the svirt_tcg
7 processes
8
10 Security-Enhanced Linux secures the svirt_tcg processes via flexible
11 mandatory access control.
12 The svirt_tcg processes execute with the svirt_tcg_t SELinux type. You
14 can check if you have these processes running by executing the ps com‐
15 mand with the -Z qualifier.
16 For example:
18 ps -eZ | grep svirt_tcg_t
20
24 The svirt_tcg_t SELinux type can be entered via the qemu_exec_t file
25 type.
26 The default entrypoint paths for the svirt_tcg_t domain are the follow‐
28 ing:
29 /usr/libexec/qemu.*, /usr/bin/qemu-system-.*, /usr/bin/qemu,
31 /usr/bin/qemu-kvm
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 svirt_tcg policy is very flexible allowing users to setup their
41 svirt_tcg processes in as secure a method as possible.
42 The following process types are defined for svirt_tcg:
44 svirt_tcg_t
46 Note: semanage permissive -a svirt_tcg_t can be used to make the
48 process type svirt_tcg_t permissive. SELinux does not deny access to
49 permissive process types, but the AVC (SELinux denials) messages are
50 still generated.
51
54 The SELinux process type svirt_tcg_t is an MCS (Multi Category Secu‐
55 rity) constrained type. Sometimes this separation is referred to as
56 sVirt. These types are usually used for securing multi-tenant environ‐
57 ments, such as virtualization, containers or separation of users. The
58 tools used to launch MCS types, pick out a different MCS label for each
59 process group.
60 For example one process might be launched with svirt_tcg_t:s0:c1,c2,
62 and another process launched with svirt_tcg_t:s0:c3,c4. The SELinux
63 kernel only allows these processes can only write to content with a
64 matching MCS label, or a MCS Label of s0. A process running with the
65 MCS level of s0:c1,c2 is not allowed to write to content with the MCS
66 label of s0:c3,c4
67
70 SELinux policy is customizable based on least access required.
71 svirt_tcg policy is extremely flexible and has several booleans that
72 allow you to manipulate the policy and run svirt_tcg with the tightest
73 access possible.
74 If you want to deny any process from ptracing or debugging any other
78 processes, you must turn on the deny_ptrace boolean. Enabled by
79 default.
80 setsebool -P deny_ptrace 1
82 If you want to allow any process to mmap any file on system with
86 attribute file_type, you must turn on the domain_can_mmap_files bool‐
87 ean. Enabled by default.
88 setsebool -P domain_can_mmap_files 1
90 If you want to allow all domains write to kmsg_device, while kernel is
94 executed with systemd.log_target=kmsg parameter, you must turn on the
95 domain_can_write_kmsg boolean. Disabled by default.
96 setsebool -P domain_can_write_kmsg 1
98 If you want to allow all domains to use other domains file descriptors,
102 you must turn on the domain_fd_use boolean. Enabled by default.
103 setsebool -P domain_fd_use 1
105 If you want to allow all domains to have the kernel load modules, you
109 must turn on the domain_kernel_load_modules boolean. Disabled by
110 default.
111 setsebool -P domain_kernel_load_modules 1
113 If you want to allow all domains to execute in fips_mode, you must turn
117 on the fips_mode boolean. Enabled by default.
118 setsebool -P fips_mode 1
120 If you want to enable reading of urandom for all domains, you must turn
124 on the global_ssp boolean. Disabled by default.
125 setsebool -P global_ssp 1
127 If you want to allow confined virtual guests to use serial/parallel
131 communication ports, you must turn on the virt_use_comm boolean. Dis‐
132 abled by default.
133 setsebool -P virt_use_comm 1
135 If you want to allow confined virtual guests to use executable memory
139 and executable stack, you must turn on the virt_use_execmem boolean.
140 Disabled by default.
141 setsebool -P virt_use_execmem 1
143 If you want to allow confined virtual guests to read fuse files, you
147 must turn on the virt_use_fusefs boolean. Disabled by default.
148 setsebool -P virt_use_fusefs 1
150 If you want to allow confined virtual guests to use glusterd, you must
154 turn on the virt_use_glusterd boolean. Disabled by default.
155 setsebool -P virt_use_glusterd 1
157 If you want to allow confined virtual guests to manage nfs files, you
161 must turn on the virt_use_nfs boolean. Disabled by default.
162 setsebool -P virt_use_nfs 1
164 If you want to allow confined virtual guests to interact with rawip
168 sockets, you must turn on the virt_use_rawip boolean. Disabled by
169 default.
170 setsebool -P virt_use_rawip 1
172 If you want to allow confined virtual guests to manage cifs files, you
176 must turn on the virt_use_samba boolean. Disabled by default.
177 setsebool -P virt_use_samba 1
179 If you want to allow confined virtual guests to interact with the san‐
183 lock, you must turn on the virt_use_sanlock boolean. Disabled by
184 default.
185 setsebool -P virt_use_sanlock 1
187 If you want to allow confined virtual guests to use usb devices, you
191 must turn on the virt_use_usb boolean. Enabled by default.
192 setsebool -P virt_use_usb 1
194 If you want to allow confined virtual guests to interact with the
198 xserver, you must turn on the virt_use_xserver boolean. Disabled by
199 default.
200 setsebool -P virt_use_xserver 1
202
206 The SELinux process type svirt_tcg_t can manage files labeled with the
207 following file types. The paths listed are the default paths for these
208 file types. Note the processes UID still need to have DAC permissions.
209 anon_inodefs_t
211 cifs_t
214 dosfs_t
217 fusefs_t
220 /var/run/user/[^/]*/gvfs
222 glusterd_var_run_t
224 /var/run/gluster(/.*)?
226 /var/run/glusterd.*
227 /var/run/glusterd.*
228 /var/run/glusterd(/.*)?
229 nfs_t
231 qemu_var_run_t
234 /var/lib/libvirt/qemu(/.*)?
236 /var/run/libvirt/qemu(/.*)?
237 svirt_home_t
239 /home/[^/]+/.libvirt/qemu(/.*)?
241 /home/[^/]+/.cache/libvirt/qemu(/.*)?
242 /home/[^/]+/.config/libvirt/qemu(/.*)?
243 /home/[^/]+/.local/share/libvirt/boot(/.*)?
244 /home/[^/]+/.local/share/libvirt/images(/.*)?
245 /home/[^/]+/.local/share/gnome-boxes/images(/.*)?
246 svirt_image_t
248 svirt_tmp_t
251 svirt_tmpfs_t
254 usbfs_t
257 virt_cache_t
260 /var/cache/oz(/.*)?
262 /var/cache/libvirt(/.*)?
263
266 semanage fcontext can also be used to manipulate default file context
267 mappings.
268 semanage permissive can also be used to manipulate whether or not a
270 process type is permissive.
271 semanage module can also be used to enable/disable/install/remove pol‐
273 icy modules.
274 semanage boolean can also be used to manipulate the booleans
276 system-config-selinux is a GUI tool available to customize SELinux pol‐
279 icy settings.
280
283 This manual page was auto-generated using sepolicy manpage .
284
287 selinux(8), svirt_tcg(8), semanage(8), restorecon(8), chcon(1), sepol‐
288 icy(8) , setsebool(8)
289svirt_tcg 19-04-25 svirt_tcg_selinux(8)