1 /*
2 * Copyright 2011 Tresys Technology, LLC. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 *
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY TRESYS TECHNOLOGY, LLC ``AS IS'' AND ANY EXPRESS
15 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
16 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
17 * EVENT SHALL TRESYS TECHNOLOGY, LLC OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
21 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
22 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * The views and conclusions contained in the software and documentation are those
26 * of the authors and should not be interpreted as representing official policies,
27 * either expressed or implied, of Tresys Technology, LLC.
28 */
29
30 #include <stdlib.h>
31 #include <stdio.h>
32 #include <stdint.h>
33 #include <string.h>
34 #include <getopt.h>
35 #include <sys/stat.h>
36
37 #ifdef ANDROID
38 #include <cil/cil.h>
39 #else
40 #include <sepol/cil/cil.h>
41 #endif
42 #include <sepol/policydb.h>
43
usage(const char * prog)44 static __attribute__((__noreturn__)) void usage(const char *prog)
45 {
46 printf("Usage: %s [OPTION]... FILE...\n", prog);
47 printf("\n");
48 printf("Options:\n");
49 printf(" -o, --output=<file> write binary policy to <file>\n");
50 printf(" (default: policy.<version>)\n");
51 printf(" -f, --filecontext=<file> write file contexts to <file>\n");
52 printf(" (default: file_contexts)\n");
53 printf(" -t, --target=<type> specify target architecture. may be selinux or\n");
54 printf(" xen. (default: selinux)\n");
55 printf(" -M, --mls true|false build an mls policy. Must be true or false.\n");
56 printf(" This will override the (mls boolean) statement\n");
57 printf(" if present in the policy\n");
58 printf(" -c, --policyvers=<version> build a binary policy with a given <version>\n");
59 printf(" (default: %i)\n", POLICYDB_VERSION_MAX);
60 printf(" -U, --handle-unknown=<action> how to handle unknown classes or permissions.\n");
61 printf(" may be deny, allow, or reject. (default: deny)\n");
62 printf(" This will override the (handleunknown action)\n");
63 printf(" statement if present in the policy\n");
64 printf(" -D, --disable-dontaudit do not add dontaudit rules to the binary policy\n");
65 printf(" -P, --preserve-tunables treat tunables as booleans\n");
66 printf(" -m, --multiple-decls allow some statements to be re-declared\n");
67 printf(" -N, --disable-neverallow do not check neverallow rules\n");
68 printf(" -G, --expand-generated Expand and remove auto-generated attributes\n");
69 printf(" -X, --expand-size <SIZE> Expand type attributes with fewer than <SIZE>\n");
70 printf(" members.\n");
71 printf(" -v, --verbose increment verbosity level\n");
72 printf(" -h, --help display usage information\n");
73 exit(1);
74 }
75
main(int argc,char * argv[])76 int main(int argc, char *argv[])
77 {
78 int rc = SEPOL_ERR;
79 sepol_policydb_t *pdb = NULL;
80 struct sepol_policy_file *pf = NULL;
81 FILE *binary = NULL;
82 FILE *file_contexts;
83 FILE *file = NULL;
84 char *buffer = NULL;
85 struct stat filedata;
86 uint32_t file_size;
87 char *output = NULL;
88 char *filecontexts = NULL;
89 struct cil_db *db = NULL;
90 int target = SEPOL_TARGET_SELINUX;
91 int mls = -1;
92 int disable_dontaudit = 0;
93 int multiple_decls = 0;
94 int disable_neverallow = 0;
95 int preserve_tunables = 0;
96 int handle_unknown = -1;
97 int policyvers = POLICYDB_VERSION_MAX;
98 int attrs_expand_generated = 0;
99 int attrs_expand_size = -1;
100 int opt_char;
101 int opt_index = 0;
102 char *fc_buf = NULL;
103 size_t fc_size;
104 enum cil_log_level log_level = CIL_ERR;
105 static struct option long_opts[] = {
106 {"help", no_argument, 0, 'h'},
107 {"verbose", no_argument, 0, 'v'},
108 {"target", required_argument, 0, 't'},
109 {"mls", required_argument, 0, 'M'},
110 {"policyversion", required_argument, 0, 'c'},
111 {"handle-unknown", required_argument, 0, 'U'},
112 {"disable-dontaudit", no_argument, 0, 'D'},
113 {"multiple-decls", no_argument, 0, 'm'},
114 {"disable-neverallow", no_argument, 0, 'N'},
115 {"preserve-tunables", no_argument, 0, 'P'},
116 {"output", required_argument, 0, 'o'},
117 {"filecontexts", required_argument, 0, 'f'},
118 {"expand-generated", no_argument, 0, 'G'},
119 {"expand-size", required_argument, 0, 'X'},
120 {0, 0, 0, 0}
121 };
122 int i;
123
124 while (1) {
125 opt_char = getopt_long(argc, argv, "o:f:U:hvt:M:PDmNc:GX:", long_opts, &opt_index);
126 if (opt_char == -1) {
127 break;
128 }
129 switch (opt_char) {
130 case 'v':
131 log_level++;
132 break;
133 case 't':
134 if (!strcmp(optarg, "selinux")) {
135 target = SEPOL_TARGET_SELINUX;
136 } else if (!strcmp(optarg, "xen")) {
137 target = SEPOL_TARGET_XEN;
138 } else {
139 fprintf(stderr, "Unknown target: %s\n", optarg);
140 usage(argv[0]);
141 }
142 break;
143 case 'M':
144 if (!strcasecmp(optarg, "true") || !strcasecmp(optarg, "1")) {
145 mls = 1;
146 } else if (!strcasecmp(optarg, "false") || !strcasecmp(optarg, "0")) {
147 mls = 0;
148 } else {
149 usage(argv[0]);
150 }
151 break;
152 case 'c': {
153 char *endptr = NULL;
154 errno = 0;
155 policyvers = strtol(optarg, &endptr, 10);
156 if (errno != 0 || endptr == optarg || *endptr != '\0') {
157 fprintf(stderr, "Bad policy version: %s\n", optarg);
158 usage(argv[0]);
159 }
160 if (policyvers > POLICYDB_VERSION_MAX || policyvers < POLICYDB_VERSION_MIN) {
161 fprintf(stderr, "Policy version must be between %d and %d\n",
162 POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
163 usage(argv[0]);
164 }
165 break;
166 }
167 case 'U':
168 if (!strcasecmp(optarg, "deny")) {
169 handle_unknown = SEPOL_DENY_UNKNOWN;
170 } else if (!strcasecmp(optarg, "allow")) {
171 handle_unknown = SEPOL_ALLOW_UNKNOWN;
172 } else if (!strcasecmp(optarg, "reject")) {
173 handle_unknown = SEPOL_REJECT_UNKNOWN;
174 } else {
175 usage(argv[0]);
176 }
177 break;
178 case 'D':
179 disable_dontaudit = 1;
180 break;
181 case 'm':
182 multiple_decls = 1;
183 break;
184 case 'N':
185 disable_neverallow = 1;
186 break;
187 case 'P':
188 preserve_tunables = 1;
189 break;
190 case 'o':
191 output = strdup(optarg);
192 break;
193 case 'f':
194 filecontexts = strdup(optarg);
195 break;
196 case 'G':
197 attrs_expand_generated = 1;
198 break;
199 case 'X': {
200 char *endptr = NULL;
201 errno = 0;
202 attrs_expand_size = strtol(optarg, &endptr, 10);
203 if (errno != 0 || endptr == optarg || *endptr != '\0') {
204 fprintf(stderr, "Bad attribute expand size: %s\n", optarg);
205 usage(argv[0]);
206 }
207
208 if (attrs_expand_size < 0) {
209 fprintf(stderr, "Attribute expand size must be > 0\n");
210 usage(argv[0]);
211 }
212 break;
213 }
214 case 'h':
215 usage(argv[0]);
216 case '?':
217 break;
218 default:
219 fprintf(stderr, "Unsupported option: %s\n", optarg);
220 usage(argv[0]);
221 }
222 }
223 if (optind >= argc) {
224 fprintf(stderr, "No cil files specified\n");
225 usage(argv[0]);
226 }
227
228 cil_set_log_level(log_level);
229
230 cil_db_init(&db);
231 cil_set_disable_dontaudit(db, disable_dontaudit);
232 cil_set_multiple_decls(db, multiple_decls);
233 cil_set_disable_neverallow(db, disable_neverallow);
234 cil_set_preserve_tunables(db, preserve_tunables);
235 if (handle_unknown != -1) {
236 rc = cil_set_handle_unknown(db, handle_unknown);
237 if (rc != SEPOL_OK) {
238 goto exit;
239 }
240 }
241
242 cil_set_mls(db, mls);
243 cil_set_target_platform(db, target);
244 cil_set_policy_version(db, policyvers);
245 cil_set_attrs_expand_generated(db, attrs_expand_generated);
246 if (attrs_expand_size >= 0) {
247 cil_set_attrs_expand_size(db, (unsigned)attrs_expand_size);
248 }
249
250 for (i = optind; i < argc; i++) {
251 file = fopen(argv[i], "r");
252 if (!file) {
253 fprintf(stderr, "Could not open file: %s\n", argv[i]);
254 rc = SEPOL_ERR;
255 goto exit;
256 }
257 rc = stat(argv[i], &filedata);
258 if (rc == -1) {
259 fprintf(stderr, "Could not stat file: %s\n", argv[i]);
260 goto exit;
261 }
262 file_size = filedata.st_size;
263
264 buffer = malloc(file_size);
265 rc = fread(buffer, file_size, 1, file);
266 if (rc != 1) {
267 fprintf(stderr, "Failure reading file: %s\n", argv[i]);
268 goto exit;
269 }
270 fclose(file);
271 file = NULL;
272
273 rc = cil_add_file(db, argv[i], buffer, file_size);
274 if (rc != SEPOL_OK) {
275 fprintf(stderr, "Failure adding %s\n", argv[i]);
276 goto exit;
277 }
278
279 free(buffer);
280 buffer = NULL;
281 }
282
283 rc = cil_compile(db);
284 if (rc != SEPOL_OK) {
285 fprintf(stderr, "Failed to compile cildb: %d\n", rc);
286 goto exit;
287 }
288
289 rc = cil_build_policydb(db, &pdb);
290 if (rc != SEPOL_OK) {
291 fprintf(stderr, "Failed to build policydb\n");
292 goto exit;
293 }
294
295 if (output == NULL) {
296 int size = snprintf(NULL, 0, "policy.%d", policyvers);
297 output = malloc((size + 1) * sizeof(char));
298 if (output == NULL) {
299 fprintf(stderr, "Failed to create output filename\n");
300 rc = SEPOL_ERR;
301 goto exit;
302 }
303 if (snprintf(output, size + 1, "policy.%d", policyvers) != size) {
304 fprintf(stderr, "Failed to create output filename\n");
305 rc = SEPOL_ERR;
306 goto exit;
307 }
308 }
309
310 binary = fopen(output, "w");
311 if (binary == NULL) {
312 fprintf(stderr, "Failure opening binary file for writing\n");
313 rc = SEPOL_ERR;
314 goto exit;
315 }
316
317 rc = sepol_policy_file_create(&pf);
318 if (rc != 0) {
319 fprintf(stderr, "Failed to create policy file: %d\n", rc);
320 goto exit;
321 }
322
323 sepol_policy_file_set_fp(pf, binary);
324
325 rc = sepol_policydb_write(pdb, pf);
326 if (rc != 0) {
327 fprintf(stderr, "Failed to write binary policy: %d\n", rc);
328 goto exit;
329 }
330
331 fclose(binary);
332 binary = NULL;
333
334 rc = cil_filecons_to_string(db, &fc_buf, &fc_size);
335 if (rc != SEPOL_OK) {
336 fprintf(stderr, "Failed to get file context data\n");
337 goto exit;
338 }
339
340 if (filecontexts == NULL) {
341 file_contexts = fopen("file_contexts", "w+");
342 } else {
343 file_contexts = fopen(filecontexts, "w+");
344 }
345
346 if (file_contexts == NULL) {
347 fprintf(stderr, "Failed to open file_contexts file\n");
348 goto exit;
349 }
350
351 if (fwrite(fc_buf, sizeof(char), fc_size, file_contexts) != fc_size) {
352 fprintf(stderr, "Failed to write file_contexts file\n");
353 goto exit;
354 }
355
356 fclose(file_contexts);
357 file_contexts = NULL;
358
359 rc = SEPOL_OK;
360
361 exit:
362 if (binary != NULL) {
363 fclose(binary);
364 }
365 if (file != NULL) {
366 fclose(file);
367 }
368 free(buffer);
369 free(output);
370 free(filecontexts);
371 cil_db_destroy(&db);
372 sepol_policydb_free(pdb);
373 sepol_policy_file_free(pf);
374 free(fc_buf);
375 return rc;
376 }
377