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1/*
2 *
3 * mdp - make dummy policy
4 *
5 * When pointed at a kernel tree, builds a dummy policy for that kernel
6 * with exactly one type with full rights to itself.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 * Copyright (C) IBM Corporation, 2006
23 *
24 * Authors: Serge E. Hallyn <serue@us.ibm.com>
25 */
26
27#include <stdio.h>
28#include <stdlib.h>
29#include <unistd.h>
30#include <string.h>
31
32static void usage(char *name)
33{
34 printf("usage: %s [-m] policy_file context_file\n", name);
35 exit(1);
36}
37
38/* Class/perm mapping support */
39struct security_class_mapping {
40 const char *name;
41 const char *perms[sizeof(unsigned) * 8 + 1];
42};
43
44#include "classmap.h"
45#include "initial_sid_to_string.h"
46
47int main(int argc, char *argv[])
48{
49 int i, j, mls = 0;
50 int initial_sid_to_string_len;
51 char **arg, *polout, *ctxout;
52
53 FILE *fout;
54
55 if (argc < 3)
56 usage(argv[0]);
57 arg = argv+1;
58 if (argc==4 && strcmp(argv[1], "-m") == 0) {
59 mls = 1;
60 arg++;
61 }
62 polout = *arg++;
63 ctxout = *arg;
64
65 fout = fopen(polout, "w");
66 if (!fout) {
67 printf("Could not open %s for writing\n", polout);
68 usage(argv[0]);
69 }
70
71 /* print out the classes */
72 for (i = 0; secclass_map[i].name; i++)
73 fprintf(fout, "class %s\n", secclass_map[i].name);
74 fprintf(fout, "\n");
75
76 initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
77 /* print out the sids */
78 for (i = 1; i < initial_sid_to_string_len; i++)
79 fprintf(fout, "sid %s\n", initial_sid_to_string[i]);
80 fprintf(fout, "\n");
81
82 /* print out the class permissions */
83 for (i = 0; secclass_map[i].name; i++) {
84 struct security_class_mapping *map = &secclass_map[i];
85 fprintf(fout, "class %s\n", map->name);
86 fprintf(fout, "{\n");
87 for (j = 0; map->perms[j]; j++)
88 fprintf(fout, "\t%s\n", map->perms[j]);
89 fprintf(fout, "}\n\n");
90 }
91 fprintf(fout, "\n");
92
93 /* NOW PRINT OUT MLS STUFF */
94 if (mls) {
95 printf("MLS not yet implemented\n");
96 exit(1);
97 }
98
99 /* types, roles, and allows */
100 fprintf(fout, "type base_t;\n");
101 fprintf(fout, "role base_r;\n");
102 fprintf(fout, "role base_r types { base_t };\n");
103 for (i = 0; secclass_map[i].name; i++)
104 fprintf(fout, "allow base_t base_t:%s *;\n",
105 secclass_map[i].name);
106 fprintf(fout, "user user_u roles { base_r };\n");
107 fprintf(fout, "\n");
108
109 /* default sids */
110 for (i = 1; i < initial_sid_to_string_len; i++)
111 fprintf(fout, "sid %s user_u:base_r:base_t\n", initial_sid_to_string[i]);
112 fprintf(fout, "\n");
113
114 fprintf(fout, "fs_use_xattr ext2 user_u:base_r:base_t;\n");
115 fprintf(fout, "fs_use_xattr ext3 user_u:base_r:base_t;\n");
116 fprintf(fout, "fs_use_xattr ext4 user_u:base_r:base_t;\n");
117 fprintf(fout, "fs_use_xattr jfs user_u:base_r:base_t;\n");
118 fprintf(fout, "fs_use_xattr xfs user_u:base_r:base_t;\n");
119 fprintf(fout, "fs_use_xattr reiserfs user_u:base_r:base_t;\n");
120 fprintf(fout, "fs_use_xattr jffs2 user_u:base_r:base_t;\n");
121 fprintf(fout, "fs_use_xattr gfs2 user_u:base_r:base_t;\n");
122 fprintf(fout, "fs_use_xattr lustre user_u:base_r:base_t;\n");
123
124 fprintf(fout, "fs_use_task eventpollfs user_u:base_r:base_t;\n");
125 fprintf(fout, "fs_use_task pipefs user_u:base_r:base_t;\n");
126 fprintf(fout, "fs_use_task sockfs user_u:base_r:base_t;\n");
127
128 fprintf(fout, "fs_use_trans mqueue user_u:base_r:base_t;\n");
129 fprintf(fout, "fs_use_trans devpts user_u:base_r:base_t;\n");
130 fprintf(fout, "fs_use_trans hugetlbfs user_u:base_r:base_t;\n");
131 fprintf(fout, "fs_use_trans tmpfs user_u:base_r:base_t;\n");
132 fprintf(fout, "fs_use_trans shm user_u:base_r:base_t;\n");
133
134 fprintf(fout, "genfscon proc / user_u:base_r:base_t\n");
135
136 fclose(fout);
137
138 fout = fopen(ctxout, "w");
139 if (!fout) {
140 printf("Wrote policy, but cannot open %s for writing\n", ctxout);
141 usage(argv[0]);
142 }
143 fprintf(fout, "/ user_u:base_r:base_t\n");
144 fprintf(fout, "/.* user_u:base_r:base_t\n");
145 fclose(fout);
146
147 return 0;
148}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * mdp - make dummy policy
5 *
6 * When pointed at a kernel tree, builds a dummy policy for that kernel
7 * with exactly one type with full rights to itself.
8 *
9 * Copyright (C) IBM Corporation, 2006
10 *
11 * Authors: Serge E. Hallyn <serue@us.ibm.com>
12 */
13
14#include <stdio.h>
15#include <stdlib.h>
16#include <unistd.h>
17#include <string.h>
18#include <linux/kconfig.h>
19
20static void usage(char *name)
21{
22 printf("usage: %s [-m] policy_file context_file\n", name);
23 exit(1);
24}
25
26/* Class/perm mapping support */
27struct security_class_mapping {
28 const char *name;
29 const char *perms[sizeof(unsigned) * 8 + 1];
30};
31
32#include "classmap.h"
33#include "initial_sid_to_string.h"
34#include "policycap_names.h"
35
36#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
37
38int main(int argc, char *argv[])
39{
40 int i, j, mls = 0;
41 int initial_sid_to_string_len;
42 char **arg, *polout, *ctxout;
43
44 FILE *fout;
45
46 if (argc < 3)
47 usage(argv[0]);
48 arg = argv+1;
49 if (argc==4 && strcmp(argv[1], "-m") == 0) {
50 mls = 1;
51 arg++;
52 }
53 polout = *arg++;
54 ctxout = *arg;
55
56 fout = fopen(polout, "w");
57 if (!fout) {
58 printf("Could not open %s for writing\n", polout);
59 usage(argv[0]);
60 }
61
62 /* print out the classes */
63 for (i = 0; secclass_map[i].name; i++)
64 fprintf(fout, "class %s\n", secclass_map[i].name);
65 fprintf(fout, "\n");
66
67 initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
68 /* print out the sids */
69 for (i = 1; i < initial_sid_to_string_len; i++) {
70 const char *name = initial_sid_to_string[i];
71
72 if (name)
73 fprintf(fout, "sid %s\n", name);
74 else
75 fprintf(fout, "sid unused%d\n", i);
76 }
77 fprintf(fout, "\n");
78
79 /* print out the class permissions */
80 for (i = 0; secclass_map[i].name; i++) {
81 const struct security_class_mapping *map = &secclass_map[i];
82 fprintf(fout, "class %s\n", map->name);
83 fprintf(fout, "{\n");
84 for (j = 0; map->perms[j]; j++)
85 fprintf(fout, "\t%s\n", map->perms[j]);
86 fprintf(fout, "}\n\n");
87 }
88 fprintf(fout, "\n");
89
90 /* print out mls declarations and constraints */
91 if (mls) {
92 fprintf(fout, "sensitivity s0;\n");
93 fprintf(fout, "sensitivity s1;\n");
94 fprintf(fout, "dominance { s0 s1 }\n");
95 fprintf(fout, "category c0;\n");
96 fprintf(fout, "category c1;\n");
97 fprintf(fout, "level s0:c0.c1;\n");
98 fprintf(fout, "level s1:c0.c1;\n");
99#define SYSTEMLOW "s0"
100#define SYSTEMHIGH "s1:c0.c1"
101 for (i = 0; secclass_map[i].name; i++) {
102 const struct security_class_mapping *map = &secclass_map[i];
103
104 fprintf(fout, "mlsconstrain %s {\n", map->name);
105 for (j = 0; map->perms[j]; j++)
106 fprintf(fout, "\t%s\n", map->perms[j]);
107 /*
108 * This requires all subjects and objects to be
109 * single-level (l2 eq h2), and that the subject
110 * level dominate the object level (h1 dom h2)
111 * in order to have any permissions to it.
112 */
113 fprintf(fout, "} (l2 eq h2 and h1 dom h2);\n\n");
114 }
115 }
116
117 /* enable all policy capabilities */
118 for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++)
119 fprintf(fout, "policycap %s;\n", selinux_policycap_names[i]);
120
121 /* types, roles, and allows */
122 fprintf(fout, "type base_t;\n");
123 fprintf(fout, "role base_r;\n");
124 fprintf(fout, "role base_r types { base_t };\n");
125 for (i = 0; secclass_map[i].name; i++)
126 fprintf(fout, "allow base_t base_t:%s *;\n",
127 secclass_map[i].name);
128 fprintf(fout, "user user_u roles { base_r }");
129 if (mls)
130 fprintf(fout, " level %s range %s - %s", SYSTEMLOW,
131 SYSTEMLOW, SYSTEMHIGH);
132 fprintf(fout, ";\n");
133
134#define SUBJUSERROLETYPE "user_u:base_r:base_t"
135#define OBJUSERROLETYPE "user_u:object_r:base_t"
136
137 /* default sids */
138 for (i = 1; i < initial_sid_to_string_len; i++) {
139 const char *name = initial_sid_to_string[i];
140
141 if (name)
142 fprintf(fout, "sid %s ", name);
143 else
144 fprintf(fout, "sid unused%d\n", i);
145 fprintf(fout, SUBJUSERROLETYPE "%s\n",
146 mls ? ":" SYSTEMLOW : "");
147 }
148 fprintf(fout, "\n");
149
150#define FS_USE(behavior, fstype) \
151 fprintf(fout, "fs_use_%s %s " OBJUSERROLETYPE "%s;\n", \
152 behavior, fstype, mls ? ":" SYSTEMLOW : "")
153
154 /*
155 * Filesystems whose inode labels can be fetched via getxattr.
156 */
157#ifdef CONFIG_EXT2_FS_SECURITY
158 FS_USE("xattr", "ext2");
159#endif
160#ifdef CONFIG_EXT4_FS_SECURITY
161#ifdef CONFIG_EXT4_USE_FOR_EXT2
162 FS_USE("xattr", "ext2");
163#endif
164 FS_USE("xattr", "ext3");
165 FS_USE("xattr", "ext4");
166#endif
167#ifdef CONFIG_JFS_SECURITY
168 FS_USE("xattr", "jfs");
169#endif
170#ifdef CONFIG_JFFS2_FS_SECURITY
171 FS_USE("xattr", "jffs2");
172#endif
173#ifdef CONFIG_XFS_FS
174 FS_USE("xattr", "xfs");
175#endif
176#ifdef CONFIG_GFS2_FS
177 FS_USE("xattr", "gfs2");
178#endif
179#ifdef CONFIG_BTRFS_FS
180 FS_USE("xattr", "btrfs");
181#endif
182#ifdef CONFIG_F2FS_FS_SECURITY
183 FS_USE("xattr", "f2fs");
184#endif
185#ifdef CONFIG_OCFS2_FS
186 FS_USE("xattr", "ocsfs2");
187#endif
188#ifdef CONFIG_OVERLAY_FS
189 FS_USE("xattr", "overlay");
190#endif
191#ifdef CONFIG_SQUASHFS_XATTR
192 FS_USE("xattr", "squashfs");
193#endif
194
195 /*
196 * Filesystems whose inodes are labeled from allocating task.
197 */
198 FS_USE("task", "pipefs");
199 FS_USE("task", "sockfs");
200
201 /*
202 * Filesystems whose inode labels are computed from both
203 * the allocating task and the superblock label.
204 */
205#ifdef CONFIG_UNIX98_PTYS
206 FS_USE("trans", "devpts");
207#endif
208#ifdef CONFIG_HUGETLBFS
209 FS_USE("trans", "hugetlbfs");
210#endif
211#ifdef CONFIG_TMPFS
212 FS_USE("trans", "tmpfs");
213#endif
214#ifdef CONFIG_DEVTMPFS
215 FS_USE("trans", "devtmpfs");
216#endif
217#ifdef CONFIG_POSIX_MQUEUE
218 FS_USE("trans", "mqueue");
219#endif
220
221#define GENFSCON(fstype, prefix) \
222 fprintf(fout, "genfscon %s %s " OBJUSERROLETYPE "%s\n", \
223 fstype, prefix, mls ? ":" SYSTEMLOW : "")
224
225 /*
226 * Filesystems whose inodes are labeled from path prefix match
227 * relative to the filesystem root. Depending on the filesystem,
228 * only a single label for all inodes may be supported. Here
229 * we list the filesystem types for which per-file labeling is
230 * supported using genfscon; any other filesystem type can also
231 * be added by only with a single entry for all of its inodes.
232 */
233#ifdef CONFIG_PROC_FS
234 GENFSCON("proc", "/");
235#endif
236#ifdef CONFIG_SECURITY_SELINUX
237 GENFSCON("selinuxfs", "/");
238#endif
239#ifdef CONFIG_SYSFS
240 GENFSCON("sysfs", "/");
241#endif
242#ifdef CONFIG_DEBUG_FS
243 GENFSCON("debugfs", "/");
244#endif
245#ifdef CONFIG_TRACING
246 GENFSCON("tracefs", "/");
247#endif
248#ifdef CONFIG_PSTORE
249 GENFSCON("pstore", "/");
250#endif
251 GENFSCON("cgroup", "/");
252 GENFSCON("cgroup2", "/");
253
254 fclose(fout);
255
256 fout = fopen(ctxout, "w");
257 if (!fout) {
258 printf("Wrote policy, but cannot open %s for writing\n", ctxout);
259 usage(argv[0]);
260 }
261 fprintf(fout, "/ " OBJUSERROLETYPE "%s\n", mls ? ":" SYSTEMLOW : "");
262 fprintf(fout, "/.* " OBJUSERROLETYPE "%s\n", mls ? ":" SYSTEMLOW : "");
263 fclose(fout);
264
265 return 0;
266}