systemd: fix policy for systemd-ssh-generator

Fixes:
avc:  denied  { getattr } for  pid=121 comm="systemd-ssh-gen"
path="/usr/sbin/sshd" dev="vda" ino=7787
scontext=system_u:system_r:systemd_generator_t
tcontext=system_u:object_r:sshd_exec_t tclass=file permissive=1

avc:  denied  { execute } for  pid=121 comm="systemd-ssh-gen"
name="sshd" dev="vda" ino=7787
scontext=system_u:system_r:systemd_generator_t
tcontext=system_u:object_r:sshd_exec_t tclass=file permissive=1

avc:  denied  { create } for  pid=121 comm="systemd-ssh-gen"
scontext=system_u:system_r:systemd_generator_t
tcontext=system_u:system_r:systemd_generator_t tclass=vsock_socket
permissive=1

avc:  denied  { read } for  pid=121 comm="systemd-ssh-gen" name="vsock"
dev="devtmpfs" ino=152 scontext=system_u:system_r:systemd_generator_t
tcontext=system_u:object_r:device_t tclass=chr_file permissive=1

avc:  denied  { open } for  pid=121 comm="systemd-ssh-gen"
path="/dev/vsock" dev="devtmpfs" ino=152
scontext=system_u:system_r:systemd_generator_t
tcontext=system_u:object_r:device_t tclass=chr_file permissive=1

avc:  denied  { ioctl } for  pid=121 comm="systemd-ssh-gen"
path="/dev/vsock" dev="devtmpfs" ino=152 ioctlcmd=0x7b9
scontext=system_u:system_r:systemd_generator_t
tcontext=system_u:object_r:device_t tclass=chr_file permissive=1

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>

policy/modules/system/systemd.te

@@ -538,6 +538,8 @@ seutil_search_default_contexts(systemd_coredump_t)
 allow systemd_generator_t self:fifo_file rw_fifo_file_perms;
 allow systemd_generator_t self:capability { dac_override sys_admin sys_resource };
 allow systemd_generator_t self:process { getcap getsched setfscreate signal };
+# for systemd-ssh-generator
+allow systemd_generator_t self:vsock_socket create;
 
 corecmd_exec_shell(systemd_generator_t)
 corecmd_exec_bin(systemd_generator_t)
@@ -548,6 +550,8 @@ dev_write_sysfs_dirs(systemd_generator_t)
 dev_read_urand(systemd_generator_t)
 dev_create_sysfs_files(systemd_generator_t)
 dev_write_sysfs(systemd_generator_t)
+# for systemd-ssh-generator
+dev_read_generic_chr_files(systemd_generator_t)
 
 files_read_etc_files(systemd_generator_t)
 files_read_etc_runtime_files(systemd_generator_t)
@@ -635,6 +639,11 @@ optional_policy(`
 	rpc_read_exports(systemd_generator_t)
 ')
 
+optional_policy(`
+	# needed by systemd-ssh-generator
+	ssh_exec_sshd(systemd_generator_t)
+')
+
 optional_policy(`
 	# needed by zfs-mount-generator
 	zfs_read_config(systemd_generator_t)