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Commit | Line | Data |
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8f2c3a70 SH |
1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright Canonical, Inc. 2012 | |
5 | * | |
6 | * Authors: | |
7 | * Serge Hallyn <serge.hallyn@canonical.com> | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
8f2c3a70 SH |
22 | */ |
23 | ||
24 | #define _GNU_SOURCE | |
567b2049 | 25 | #include <errno.h> |
ccf8d128 | 26 | #include <seccomp.h> |
8f2c3a70 SH |
27 | #include <stdio.h> |
28 | #include <stdlib.h> | |
6166fa6d | 29 | #include <sys/mount.h> |
567b2049 | 30 | #include <sys/utsname.h> |
f2363e38 | 31 | |
769872f9 | 32 | #include "config.h" |
8f2c3a70 | 33 | #include "log.h" |
567b2049 | 34 | #include "lxcseccomp.h" |
eacebcc3 | 35 | #include "utils.h" |
8f2c3a70 | 36 | |
0b5c590d CB |
37 | #ifdef __MIPSEL__ |
38 | #define MIPS_ARCH_O32 lxc_seccomp_arch_mipsel | |
39 | #define MIPS_ARCH_N64 lxc_seccomp_arch_mipsel64 | |
40 | #else | |
41 | #define MIPS_ARCH_O32 lxc_seccomp_arch_mips | |
42 | #define MIPS_ARCH_N64 lxc_seccomp_arch_mips64 | |
43 | #endif | |
44 | ||
8f2c3a70 SH |
45 | lxc_log_define(lxc_seccomp, lxc); |
46 | ||
50798138 SH |
47 | static int parse_config_v1(FILE *f, struct lxc_conf *conf) |
48 | { | |
ccf8d128 CB |
49 | int ret = 0; |
50 | size_t line_bufsz = 0; | |
51 | char *line = NULL; | |
50798138 | 52 | |
ccf8d128 | 53 | while (getline(&line, &line_bufsz, f) != -1) { |
50798138 | 54 | int nr; |
ccf8d128 | 55 | |
50798138 | 56 | ret = sscanf(line, "%d", &nr); |
97a9b258 WB |
57 | if (ret != 1) { |
58 | ret = -1; | |
59 | break; | |
60 | } | |
ccf8d128 | 61 | |
50798138 | 62 | #if HAVE_SCMP_FILTER_CTX |
ccf8d128 CB |
63 | ret = seccomp_rule_add(conf->seccomp_ctx, SCMP_ACT_ALLOW, nr, 0); |
64 | #else | |
65 | ret = seccomp_rule_add(SCMP_ACT_ALLOW, nr, 0); | |
50798138 | 66 | #endif |
50798138 | 67 | if (ret < 0) { |
3ee26d19 | 68 | ERROR("Failed loading allow rule for %d", nr); |
ccf8d128 | 69 | break; |
50798138 SH |
70 | } |
71 | } | |
ccf8d128 CB |
72 | free(line); |
73 | ||
74 | return ret; | |
50798138 SH |
75 | } |
76 | ||
2b0ae718 | 77 | #if HAVE_DECL_SECCOMP_SYSCALL_RESOLVE_NAME_ARCH |
1ab6b4a1 CB |
78 | static const char *get_action_name(uint32_t action) |
79 | { | |
80 | /* The upper 16 bits indicate the type of the seccomp action. */ | |
81 | switch (action & 0xffff0000) { | |
82 | case SCMP_ACT_KILL: | |
83 | return "kill"; | |
84 | case SCMP_ACT_ALLOW: | |
85 | return "allow"; | |
86 | case SCMP_ACT_TRAP: | |
87 | return "trap"; | |
88 | case SCMP_ACT_ERRNO(0): | |
89 | return "errno"; | |
90 | } | |
91 | ||
92 | return "invalid action"; | |
93 | } | |
94 | ||
50798138 SH |
95 | static uint32_t get_v2_default_action(char *line) |
96 | { | |
97 | uint32_t ret_action = -1; | |
98 | ||
f06c6207 CB |
99 | while (*line == ' ') |
100 | line++; | |
30448a13 | 101 | |
1a0e70ac | 102 | /* After 'whitelist' or 'blacklist' comes default behavior. */ |
30448a13 | 103 | if (strncmp(line, "kill", 4) == 0) { |
50798138 | 104 | ret_action = SCMP_ACT_KILL; |
30448a13 CB |
105 | } else if (strncmp(line, "errno", 5) == 0) { |
106 | int e, ret; | |
107 | ||
108 | ret = sscanf(line + 5, "%d", &e); | |
109 | if (ret != 1) { | |
110 | ERROR("Failed to parse errno value from %s", line); | |
50798138 SH |
111 | return -2; |
112 | } | |
30448a13 | 113 | |
50798138 | 114 | ret_action = SCMP_ACT_ERRNO(e); |
30448a13 | 115 | } else if (strncmp(line, "allow", 5) == 0) { |
50798138 | 116 | ret_action = SCMP_ACT_ALLOW; |
30448a13 | 117 | } else if (strncmp(line, "trap", 4) == 0) { |
50798138 | 118 | ret_action = SCMP_ACT_TRAP; |
30448a13 CB |
119 | } |
120 | ||
50798138 SH |
121 | return ret_action; |
122 | } | |
123 | ||
3ee26d19 | 124 | static uint32_t get_v2_action(char *line, uint32_t def_action) |
50798138 | 125 | { |
1ab6b4a1 | 126 | char *p; |
50798138 SH |
127 | uint32_t ret; |
128 | ||
1ab6b4a1 | 129 | p = strchr(line, ' '); |
50798138 SH |
130 | if (!p) |
131 | return def_action; | |
50798138 | 132 | p++; |
1ab6b4a1 | 133 | |
50798138 SH |
134 | while (*p == ' ') |
135 | p++; | |
1ab6b4a1 | 136 | |
50798138 SH |
137 | if (!*p || *p == '#') |
138 | return def_action; | |
1ab6b4a1 | 139 | |
50798138 | 140 | ret = get_v2_default_action(p); |
1ab6b4a1 CB |
141 | switch (ret) { |
142 | case -2: | |
143 | return -1; | |
144 | case -1: | |
145 | return def_action; | |
50798138 | 146 | } |
1ab6b4a1 CB |
147 | |
148 | return ret; | |
50798138 | 149 | } |
3ee26d19 | 150 | |
63a49b03 | 151 | struct seccomp_v2_rule_args { |
3ee26d19 L |
152 | uint32_t index; |
153 | uint64_t value; | |
154 | uint64_t mask; | |
155 | enum scmp_compare op; | |
156 | }; | |
157 | ||
158 | struct seccomp_v2_rule { | |
159 | uint32_t action; | |
160 | uint32_t args_num; | |
63a49b03 | 161 | struct seccomp_v2_rule_args args_value[6]; |
3ee26d19 L |
162 | }; |
163 | ||
164 | static enum scmp_compare parse_v2_rule_op(char *s) | |
165 | { | |
3ee26d19 | 166 | if (strcmp(s, "SCMP_CMP_NE") == 0 || strcmp(s, "!=") == 0) |
29cb2617 | 167 | return SCMP_CMP_NE; |
3ee26d19 | 168 | else if (strcmp(s, "SCMP_CMP_LT") == 0 || strcmp(s, "<") == 0) |
29cb2617 | 169 | return SCMP_CMP_LT; |
3ee26d19 | 170 | else if (strcmp(s, "SCMP_CMP_LE") == 0 || strcmp(s, "<=") == 0) |
29cb2617 | 171 | return SCMP_CMP_LE; |
3ee26d19 | 172 | else if (strcmp(s, "SCMP_CMP_EQ") == 0 || strcmp(s, "==") == 0) |
29cb2617 | 173 | return SCMP_CMP_EQ; |
3ee26d19 | 174 | else if (strcmp(s, "SCMP_CMP_GE") == 0 || strcmp(s, ">=") == 0) |
29cb2617 | 175 | return SCMP_CMP_GE; |
3ee26d19 | 176 | else if (strcmp(s, "SCMP_CMP_GT") == 0 || strcmp(s, ">") == 0) |
29cb2617 | 177 | return SCMP_CMP_GT; |
3ee26d19 | 178 | else if (strcmp(s, "SCMP_CMP_MASKED_EQ") == 0 || strcmp(s, "&=") == 0) |
29cb2617 | 179 | return SCMP_CMP_MASKED_EQ; |
3ee26d19 | 180 | |
29cb2617 | 181 | return _SCMP_CMP_MAX; |
3ee26d19 L |
182 | } |
183 | ||
63a49b03 CB |
184 | /* |
185 | * This function is used to parse the args string into the structure. | |
3ee26d19 | 186 | * args string format:[index,value,op,valueTwo] or [index,value,op] |
3ee26d19 L |
187 | * index: the index for syscall arguments (type uint) |
188 | * value: the value for syscall arguments (type uint64) | |
189 | * op: the operator for syscall arguments(string), | |
190 | a valid list of constants as of libseccomp v2.3.2 is | |
191 | SCMP_CMP_NE,SCMP_CMP_LE,SCMP_CMP_LE, SCMP_CMP_EQ, SCMP_CMP_GE, | |
192 | SCMP_CMP_GT, SCMP_CMP_MASKED_EQ, or !=,<=,==,>=,>,&= | |
193 | * valueTwo: the value for syscall arguments only used for mask eq (type uint64, optional) | |
194 | * Returns 0 on success, < 0 otherwise. | |
195 | */ | |
63a49b03 | 196 | static int get_seccomp_arg_value(char *key, struct seccomp_v2_rule_args *rule_args) |
3ee26d19 L |
197 | { |
198 | int ret = 0; | |
3ee26d19 | 199 | uint32_t index = 0; |
63a49b03 CB |
200 | uint64_t mask = 0, value = 0; |
201 | enum scmp_compare op = 0; | |
3ee26d19 | 202 | char *tmp = NULL; |
63a49b03 | 203 | char s[31] = {0}, v[24] = {0}, m[24] = {0}; |
3ee26d19 | 204 | |
3ee26d19 L |
205 | tmp = strchr(key, '['); |
206 | if (!tmp) { | |
207 | ERROR("Failed to interpret args"); | |
208 | return -1; | |
209 | } | |
63a49b03 | 210 | |
eacebcc3 | 211 | ret = sscanf(tmp, "[%i,%23[^,],%30[^0-9^,],%23[^,]", &index, v, s, m); |
3ee26d19 L |
212 | if ((ret != 3 && ret != 4) || index >= 6) { |
213 | ERROR("Failed to interpret args value"); | |
214 | return -1; | |
215 | } | |
216 | ||
eacebcc3 FA |
217 | ret = lxc_safe_uint64(v, &value); |
218 | if (ret < 0) { | |
219 | ERROR("Invalid argument value"); | |
220 | return -1; | |
221 | } | |
222 | ||
63a49b03 | 223 | ret = lxc_safe_uint64(m, &mask); |
eacebcc3 FA |
224 | if (ret < 0) { |
225 | ERROR("Invalid argument mask"); | |
226 | return -1; | |
227 | } | |
228 | ||
3ee26d19 L |
229 | op = parse_v2_rule_op(s); |
230 | if (op == _SCMP_CMP_MAX) { | |
231 | ERROR("Failed to interpret args operator value"); | |
232 | return -1; | |
233 | } | |
234 | ||
235 | rule_args->index = index; | |
236 | rule_args->value = value; | |
237 | rule_args->mask = mask; | |
238 | rule_args->op = op; | |
239 | return 0; | |
240 | } | |
241 | ||
242 | /* This function is used to parse the seccomp rule entry. | |
243 | * @line : seccomp rule entry string. | |
244 | * @def_action : default action used in the case if the 'line' contain non valid action. | |
245 | * @rules : output struct. | |
246 | * Returns 0 on success, < 0 otherwise. | |
247 | */ | |
f67c94d0 CB |
248 | static int parse_v2_rules(char *line, uint32_t def_action, |
249 | struct seccomp_v2_rule *rules) | |
3ee26d19 | 250 | { |
f67c94d0 CB |
251 | int i = 0, ret = -1; |
252 | char *key = NULL, *saveptr = NULL, *tmp = NULL; | |
3ee26d19 L |
253 | |
254 | tmp = strdup(line); | |
255 | if (!tmp) | |
256 | return -1; | |
257 | ||
258 | /* read optional action which follows the syscall */ | |
259 | rules->action = get_v2_action(tmp, def_action); | |
3ee26d19 | 260 | |
f67c94d0 | 261 | ret = 0; |
3ee26d19 | 262 | rules->args_num = 0; |
f67c94d0 | 263 | if (!strchr(tmp, '[')) |
3ee26d19 | 264 | goto out; |
3ee26d19 | 265 | |
f67c94d0 CB |
266 | ret = -1; |
267 | for ((key = strtok_r(tmp, "]", &saveptr)), i = 0; key && i < 6; | |
268 | (key = strtok_r(NULL, "]", &saveptr)), i++) { | |
3ee26d19 | 269 | ret = get_seccomp_arg_value(key, &rules->args_value[i]); |
f67c94d0 | 270 | if (ret < 0) |
3ee26d19 | 271 | goto out; |
f67c94d0 | 272 | |
3ee26d19 L |
273 | rules->args_num++; |
274 | } | |
275 | ||
276 | ret = 0; | |
f67c94d0 | 277 | |
3ee26d19 L |
278 | out: |
279 | free(tmp); | |
f67c94d0 | 280 | |
3ee26d19 L |
281 | return ret; |
282 | } | |
2b0ae718 | 283 | #endif |
50798138 | 284 | |
d58c6ad0 SH |
285 | #if HAVE_DECL_SECCOMP_SYSCALL_RESOLVE_NAME_ARCH |
286 | enum lxc_hostarch_t { | |
287 | lxc_seccomp_arch_all = 0, | |
288 | lxc_seccomp_arch_native, | |
289 | lxc_seccomp_arch_i386, | |
11de80d6 | 290 | lxc_seccomp_arch_x32, |
d58c6ad0 SH |
291 | lxc_seccomp_arch_amd64, |
292 | lxc_seccomp_arch_arm, | |
9d291dd2 | 293 | lxc_seccomp_arch_arm64, |
b4067426 BP |
294 | lxc_seccomp_arch_ppc64, |
295 | lxc_seccomp_arch_ppc64le, | |
296 | lxc_seccomp_arch_ppc, | |
2ccd9eda JC |
297 | lxc_seccomp_arch_mips, |
298 | lxc_seccomp_arch_mips64, | |
299 | lxc_seccomp_arch_mips64n32, | |
300 | lxc_seccomp_arch_mipsel, | |
301 | lxc_seccomp_arch_mipsel64, | |
302 | lxc_seccomp_arch_mipsel64n32, | |
be038e49 | 303 | lxc_seccomp_arch_s390x, |
d58c6ad0 SH |
304 | lxc_seccomp_arch_unknown = 999, |
305 | }; | |
306 | ||
307 | int get_hostarch(void) | |
308 | { | |
309 | struct utsname uts; | |
310 | if (uname(&uts) < 0) { | |
3ee26d19 | 311 | SYSERROR("Failed to read host arch"); |
d58c6ad0 SH |
312 | return -1; |
313 | } | |
0197fe2e | 314 | |
d58c6ad0 SH |
315 | if (strcmp(uts.machine, "i686") == 0) |
316 | return lxc_seccomp_arch_i386; | |
1a0e70ac | 317 | /* no x32 kernels */ |
d58c6ad0 SH |
318 | else if (strcmp(uts.machine, "x86_64") == 0) |
319 | return lxc_seccomp_arch_amd64; | |
320 | else if (strncmp(uts.machine, "armv7", 5) == 0) | |
321 | return lxc_seccomp_arch_arm; | |
9d291dd2 BP |
322 | else if (strncmp(uts.machine, "aarch64", 7) == 0) |
323 | return lxc_seccomp_arch_arm64; | |
b4067426 BP |
324 | else if (strncmp(uts.machine, "ppc64le", 7) == 0) |
325 | return lxc_seccomp_arch_ppc64le; | |
326 | else if (strncmp(uts.machine, "ppc64", 5) == 0) | |
327 | return lxc_seccomp_arch_ppc64; | |
328 | else if (strncmp(uts.machine, "ppc", 3) == 0) | |
329 | return lxc_seccomp_arch_ppc; | |
2ccd9eda JC |
330 | else if (strncmp(uts.machine, "mips64", 6) == 0) |
331 | return MIPS_ARCH_N64; | |
332 | else if (strncmp(uts.machine, "mips", 4) == 0) | |
333 | return MIPS_ARCH_O32; | |
be038e49 CB |
334 | else if (strncmp(uts.machine, "s390x", 5) == 0) |
335 | return lxc_seccomp_arch_s390x; | |
0197fe2e | 336 | |
d58c6ad0 SH |
337 | return lxc_seccomp_arch_unknown; |
338 | } | |
339 | ||
04263914 CB |
340 | scmp_filter_ctx get_new_ctx(enum lxc_hostarch_t n_arch, |
341 | uint32_t default_policy_action, bool *needs_merge) | |
d58c6ad0 | 342 | { |
d58c6ad0 SH |
343 | int ret; |
344 | uint32_t arch; | |
04263914 | 345 | scmp_filter_ctx ctx; |
d58c6ad0 | 346 | |
04263914 CB |
347 | switch (n_arch) { |
348 | case lxc_seccomp_arch_i386: | |
349 | arch = SCMP_ARCH_X86; | |
350 | break; | |
351 | case lxc_seccomp_arch_x32: | |
352 | arch = SCMP_ARCH_X32; | |
353 | break; | |
354 | case lxc_seccomp_arch_amd64: | |
355 | arch = SCMP_ARCH_X86_64; | |
356 | break; | |
357 | case lxc_seccomp_arch_arm: | |
358 | arch = SCMP_ARCH_ARM; | |
359 | break; | |
9d291dd2 | 360 | #ifdef SCMP_ARCH_AARCH64 |
04263914 CB |
361 | case lxc_seccomp_arch_arm64: |
362 | arch = SCMP_ARCH_AARCH64; | |
363 | break; | |
9d291dd2 | 364 | #endif |
b4067426 | 365 | #ifdef SCMP_ARCH_PPC64LE |
04263914 CB |
366 | case lxc_seccomp_arch_ppc64le: |
367 | arch = SCMP_ARCH_PPC64LE; | |
368 | break; | |
b4067426 BP |
369 | #endif |
370 | #ifdef SCMP_ARCH_PPC64 | |
04263914 CB |
371 | case lxc_seccomp_arch_ppc64: |
372 | arch = SCMP_ARCH_PPC64; | |
373 | break; | |
b4067426 BP |
374 | #endif |
375 | #ifdef SCMP_ARCH_PPC | |
04263914 CB |
376 | case lxc_seccomp_arch_ppc: |
377 | arch = SCMP_ARCH_PPC; | |
378 | break; | |
2ccd9eda JC |
379 | #endif |
380 | #ifdef SCMP_ARCH_MIPS | |
04263914 CB |
381 | case lxc_seccomp_arch_mips: |
382 | arch = SCMP_ARCH_MIPS; | |
383 | break; | |
384 | case lxc_seccomp_arch_mips64: | |
385 | arch = SCMP_ARCH_MIPS64; | |
386 | break; | |
387 | case lxc_seccomp_arch_mips64n32: | |
388 | arch = SCMP_ARCH_MIPS64N32; | |
389 | break; | |
390 | case lxc_seccomp_arch_mipsel: | |
391 | arch = SCMP_ARCH_MIPSEL; | |
392 | break; | |
393 | case lxc_seccomp_arch_mipsel64: | |
394 | arch = SCMP_ARCH_MIPSEL64; | |
395 | break; | |
396 | case lxc_seccomp_arch_mipsel64n32: | |
397 | arch = SCMP_ARCH_MIPSEL64N32; | |
398 | break; | |
be038e49 CB |
399 | #endif |
400 | #ifdef SCMP_ARCH_S390X | |
04263914 CB |
401 | case lxc_seccomp_arch_s390x: |
402 | arch = SCMP_ARCH_S390X; | |
403 | break; | |
b4067426 | 404 | #endif |
04263914 CB |
405 | default: |
406 | return NULL; | |
d58c6ad0 SH |
407 | } |
408 | ||
04263914 CB |
409 | ctx = seccomp_init(default_policy_action); |
410 | if (!ctx) { | |
3ee26d19 | 411 | ERROR("Error initializing seccomp context"); |
d58c6ad0 SH |
412 | return NULL; |
413 | } | |
04263914 CB |
414 | |
415 | ret = seccomp_attr_set(ctx, SCMP_FLTATR_CTL_NNP, 0); | |
416 | if (ret < 0) { | |
417 | ERROR("%s - Failed to turn off no-new-privs", strerror(-ret)); | |
d58c6ad0 SH |
418 | seccomp_release(ctx); |
419 | return NULL; | |
420 | } | |
04263914 | 421 | |
127c5293 | 422 | #ifdef SCMP_FLTATR_ATL_TSKIP |
04263914 CB |
423 | ret = seccomp_attr_set(ctx, SCMP_FLTATR_ATL_TSKIP, 1); |
424 | if (ret < 0) | |
425 | WARN("%s - Failed to turn on seccomp nop-skip, continuing", strerror(-ret)); | |
127c5293 | 426 | #endif |
b5ed021b | 427 | |
adfee3a8 CB |
428 | ret = seccomp_arch_exist(ctx, arch); |
429 | if (ret < 0) { | |
430 | if (ret != -EEXIST) { | |
431 | ERROR("%s - Failed to determine whether arch %d is " | |
432 | "already present in the main seccomp context", | |
04263914 | 433 | strerror(-ret), (int)n_arch); |
adfee3a8 CB |
434 | seccomp_release(ctx); |
435 | return NULL; | |
436 | } | |
437 | ||
b5ed021b CB |
438 | ret = seccomp_arch_add(ctx, arch); |
439 | if (ret != 0) { | |
adfee3a8 CB |
440 | ERROR("%s - Failed to add arch %d to main seccomp context", |
441 | strerror(-ret), (int)n_arch); | |
b5ed021b CB |
442 | seccomp_release(ctx); |
443 | return NULL; | |
444 | } | |
adfee3a8 | 445 | TRACE("Added arch %d to main seccomp context", (int)n_arch); |
b5ed021b | 446 | |
adfee3a8 CB |
447 | ret = seccomp_arch_remove(ctx, SCMP_ARCH_NATIVE); |
448 | if (ret != 0) { | |
449 | ERROR("Failed to remove native arch from main seccomp context"); | |
b5ed021b CB |
450 | seccomp_release(ctx); |
451 | return NULL; | |
452 | } | |
adfee3a8 | 453 | TRACE("Removed native arch from main seccomp context"); |
eca6736e CB |
454 | |
455 | *needs_merge = true; | |
adfee3a8 | 456 | } else { |
eca6736e | 457 | *needs_merge = false; |
adfee3a8 | 458 | TRACE("Arch %d already present in main seccomp context", (int)n_arch); |
d58c6ad0 SH |
459 | } |
460 | ||
461 | return ctx; | |
462 | } | |
463 | ||
464 | bool do_resolve_add_rule(uint32_t arch, char *line, scmp_filter_ctx ctx, | |
ad9a5b72 | 465 | struct seccomp_v2_rule *rule) |
d58c6ad0 | 466 | { |
ad9a5b72 | 467 | int i, nr, ret; |
3ee26d19 L |
468 | struct scmp_arg_cmp arg_cmp[6]; |
469 | ||
f06c6207 CB |
470 | ret = seccomp_arch_exist(ctx, arch); |
471 | if (arch && ret != 0) { | |
ad9a5b72 | 472 | ERROR("%s - Seccomp: rule and context arch do not match (arch %d)", strerror(-ret), arch); |
d58c6ad0 SH |
473 | return false; |
474 | } | |
6166fa6d | 475 | |
3ee26d19 L |
476 | /*get the syscall name*/ |
477 | char *p = strchr(line, ' '); | |
478 | if (p) | |
479 | *p = '\0'; | |
480 | ||
6166fa6d | 481 | if (strncmp(line, "reject_force_umount", 19) == 0) { |
ad9a5b72 CB |
482 | ret = seccomp_rule_add_exact(ctx, SCMP_ACT_ERRNO(EACCES), |
483 | SCMP_SYS(umount2), 1, | |
484 | SCMP_A1(SCMP_CMP_MASKED_EQ, MNT_FORCE, MNT_FORCE)); | |
6166fa6d | 485 | if (ret < 0) { |
ad9a5b72 | 486 | ERROR("%s - Failed loading rule to reject force umount", strerror(-ret)); |
6166fa6d SH |
487 | return false; |
488 | } | |
ad9a5b72 CB |
489 | |
490 | INFO("Set seccomp rule to reject force umounts"); | |
6166fa6d SH |
491 | return true; |
492 | } | |
493 | ||
cd75548b | 494 | nr = seccomp_syscall_resolve_name(line); |
d58c6ad0 | 495 | if (nr == __NR_SCMP_ERROR) { |
ad9a5b72 | 496 | WARN("Failed to resolve syscall \"%s\"", line); |
3ee26d19 | 497 | WARN("This syscall will NOT be blacklisted"); |
d58c6ad0 SH |
498 | return true; |
499 | } | |
ad9a5b72 | 500 | |
d58c6ad0 | 501 | if (nr < 0) { |
ad9a5b72 | 502 | WARN("Got negative return value %d for syscall \"%s\"", nr, line); |
3ee26d19 | 503 | WARN("This syscall will NOT be blacklisted"); |
d58c6ad0 SH |
504 | return true; |
505 | } | |
3ee26d19 | 506 | |
ad9a5b72 | 507 | memset(&arg_cmp, 0, sizeof(arg_cmp)); |
3ee26d19 | 508 | for (i = 0; i < rule->args_num; i++) { |
ad9a5b72 CB |
509 | INFO("arg_cmp[%d]: SCMP_CMP(%u, %llu, %llu, %llu)", i, |
510 | rule->args_value[i].index, | |
511 | (long long unsigned int)rule->args_value[i].op, | |
512 | (long long unsigned int)rule->args_value[i].mask, | |
513 | (long long unsigned int)rule->args_value[i].value); | |
3ee26d19 L |
514 | |
515 | if (SCMP_CMP_MASKED_EQ == rule->args_value[i].op) | |
ad9a5b72 CB |
516 | arg_cmp[i] = SCMP_CMP(rule->args_value[i].index, |
517 | rule->args_value[i].op, | |
518 | rule->args_value[i].mask, | |
519 | rule->args_value[i].value); | |
3ee26d19 | 520 | else |
ad9a5b72 CB |
521 | arg_cmp[i] = SCMP_CMP(rule->args_value[i].index, |
522 | rule->args_value[i].op, | |
523 | rule->args_value[i].value); | |
3ee26d19 L |
524 | } |
525 | ||
ad9a5b72 CB |
526 | ret = seccomp_rule_add_exact_array(ctx, rule->action, nr, |
527 | rule->args_num, arg_cmp); | |
d58c6ad0 | 528 | if (ret < 0) { |
ad9a5b72 CB |
529 | ERROR("%s - Failed loading rule for %s (nr %d action %d (%s))", |
530 | strerror(-ret), line, nr, rule->action, | |
531 | get_action_name(rule->action)); | |
d58c6ad0 SH |
532 | return false; |
533 | } | |
ad9a5b72 | 534 | |
d58c6ad0 SH |
535 | return true; |
536 | } | |
537 | ||
50798138 SH |
538 | /* |
539 | * v2 consists of | |
540 | * [x86] | |
541 | * open | |
542 | * read | |
543 | * write | |
544 | * close | |
545 | * # a comment | |
546 | * [x86_64] | |
547 | * open | |
548 | * read | |
549 | * write | |
550 | * close | |
551 | */ | |
552 | static int parse_config_v2(FILE *f, char *line, struct lxc_conf *conf) | |
553 | { | |
50798138 | 554 | int ret; |
9c3798eb CB |
555 | char *p; |
556 | enum lxc_hostarch_t cur_rule_arch, native_arch; | |
557 | size_t line_bufsz = 0; | |
50798138 | 558 | bool blacklist = false; |
9c3798eb | 559 | char *rule_line = NULL; |
3ee26d19 | 560 | uint32_t default_policy_action = -1, default_rule_action = -1; |
3ee26d19 | 561 | struct seccomp_v2_rule rule; |
eca6736e CB |
562 | struct scmp_ctx_info { |
563 | uint32_t architectures[3]; | |
564 | scmp_filter_ctx contexts[3]; | |
565 | bool needs_merge[3]; | |
566 | } ctx; | |
50798138 SH |
567 | |
568 | if (strncmp(line, "blacklist", 9) == 0) | |
569 | blacklist = true; | |
570 | else if (strncmp(line, "whitelist", 9) != 0) { | |
9c3798eb | 571 | ERROR("Bad seccomp policy style \"%s\"", line); |
50798138 SH |
572 | return -1; |
573 | } | |
574 | ||
9c3798eb CB |
575 | p = strchr(line, ' '); |
576 | if (p) { | |
f06c6207 | 577 | default_policy_action = get_v2_default_action(p + 1); |
50798138 SH |
578 | if (default_policy_action == -2) |
579 | return -1; | |
580 | } | |
581 | ||
582 | /* for blacklist, allow any syscall which has no rule */ | |
583 | if (blacklist) { | |
584 | if (default_policy_action == -1) | |
585 | default_policy_action = SCMP_ACT_ALLOW; | |
9c3798eb | 586 | |
50798138 SH |
587 | if (default_rule_action == -1) |
588 | default_rule_action = SCMP_ACT_KILL; | |
589 | } else { | |
590 | if (default_policy_action == -1) | |
591 | default_policy_action = SCMP_ACT_KILL; | |
9c3798eb | 592 | |
50798138 SH |
593 | if (default_rule_action == -1) |
594 | default_rule_action = SCMP_ACT_ALLOW; | |
595 | } | |
596 | ||
eca6736e CB |
597 | memset(&ctx, 0, sizeof(ctx)); |
598 | ctx.architectures[0] = SCMP_ARCH_NATIVE; | |
599 | ctx.architectures[1] = SCMP_ARCH_NATIVE; | |
600 | ctx.architectures[2] = SCMP_ARCH_NATIVE; | |
9c3798eb CB |
601 | native_arch = get_hostarch(); |
602 | cur_rule_arch = native_arch; | |
d58c6ad0 SH |
603 | if (native_arch == lxc_seccomp_arch_amd64) { |
604 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
605 | |
606 | ctx.architectures[0] = SCMP_ARCH_X86; | |
607 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_i386, | |
608 | default_policy_action, | |
609 | &ctx.needs_merge[0]); | |
610 | if (!ctx.contexts[0]) | |
611 | goto bad; | |
612 | ||
613 | ctx.architectures[1] = SCMP_ARCH_X32; | |
614 | ctx.contexts[1] = get_new_ctx(lxc_seccomp_arch_x32, | |
615 | default_policy_action, | |
616 | &ctx.needs_merge[1]); | |
617 | if (!ctx.contexts[1]) | |
618 | goto bad; | |
619 | ||
620 | ctx.architectures[2] = SCMP_ARCH_X86_64; | |
621 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_amd64, | |
622 | default_policy_action, | |
623 | &ctx.needs_merge[2]); | |
624 | if (!ctx.contexts[2]) | |
ab5e52f6 | 625 | goto bad; |
ca399594 | 626 | #ifdef SCMP_ARCH_PPC |
7635139a SH |
627 | } else if (native_arch == lxc_seccomp_arch_ppc64) { |
628 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
629 | |
630 | ctx.architectures[0] = SCMP_ARCH_PPC; | |
631 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_ppc, | |
632 | default_policy_action, | |
633 | &ctx.needs_merge[0]); | |
634 | if (!ctx.contexts[0]) | |
635 | goto bad; | |
636 | ||
637 | ctx.architectures[2] = SCMP_ARCH_PPC64; | |
638 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_ppc64, | |
639 | default_policy_action, | |
640 | &ctx.needs_merge[2]); | |
641 | if (!ctx.contexts[2]) | |
7635139a | 642 | goto bad; |
ca399594 CB |
643 | #endif |
644 | #ifdef SCMP_ARCH_ARM | |
7635139a SH |
645 | } else if (native_arch == lxc_seccomp_arch_arm64) { |
646 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
647 | |
648 | ctx.architectures[0] = SCMP_ARCH_ARM; | |
9c3798eb CB |
649 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_arm, |
650 | default_policy_action, | |
651 | &ctx.needs_merge[0]); | |
eca6736e CB |
652 | if (!ctx.contexts[0]) |
653 | goto bad; | |
654 | ||
b1c428f9 | 655 | #ifdef SCMP_ARCH_AARCH64 |
eca6736e | 656 | ctx.architectures[2] = SCMP_ARCH_AARCH64; |
9c3798eb CB |
657 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_arm64, |
658 | default_policy_action, | |
659 | &ctx.needs_merge[2]); | |
eca6736e | 660 | if (!ctx.contexts[2]) |
2ccd9eda JC |
661 | goto bad; |
662 | #endif | |
b1c428f9 | 663 | #endif |
2ccd9eda JC |
664 | #ifdef SCMP_ARCH_MIPS |
665 | } else if (native_arch == lxc_seccomp_arch_mips64) { | |
666 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
667 | |
668 | ctx.architectures[0] = SCMP_ARCH_MIPS; | |
669 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_mips, | |
670 | default_policy_action, | |
671 | &ctx.needs_merge[0]); | |
672 | if (!ctx.contexts[0]) | |
673 | goto bad; | |
674 | ||
675 | ctx.architectures[1] = SCMP_ARCH_MIPS64N32; | |
676 | ctx.contexts[1] = get_new_ctx(lxc_seccomp_arch_mips64n32, | |
677 | default_policy_action, | |
678 | &ctx.needs_merge[1]); | |
679 | if (!ctx.contexts[1]) | |
680 | goto bad; | |
681 | ||
682 | ctx.architectures[2] = SCMP_ARCH_MIPS64; | |
683 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_mips64, | |
684 | default_policy_action, | |
685 | &ctx.needs_merge[2]); | |
686 | if (!ctx.contexts[2]) | |
2ccd9eda JC |
687 | goto bad; |
688 | } else if (native_arch == lxc_seccomp_arch_mipsel64) { | |
689 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
690 | |
691 | ctx.architectures[0] = SCMP_ARCH_MIPSEL; | |
692 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_mipsel, | |
693 | default_policy_action, | |
694 | &ctx.needs_merge[0]); | |
695 | if (!ctx.contexts[0]) | |
696 | goto bad; | |
697 | ||
698 | ctx.architectures[1] = SCMP_ARCH_MIPSEL64N32; | |
699 | ctx.contexts[1] = get_new_ctx(lxc_seccomp_arch_mipsel64n32, | |
700 | default_policy_action, | |
701 | &ctx.needs_merge[1]); | |
702 | if (!ctx.contexts[1]) | |
703 | goto bad; | |
704 | ||
705 | ctx.architectures[2] = SCMP_ARCH_MIPSEL64; | |
706 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_mipsel64, | |
707 | default_policy_action, | |
708 | &ctx.needs_merge[2]); | |
709 | if (!ctx.contexts[2]) | |
7635139a | 710 | goto bad; |
be038e49 | 711 | #endif |
d58c6ad0 SH |
712 | } |
713 | ||
50798138 SH |
714 | if (default_policy_action != SCMP_ACT_KILL) { |
715 | ret = seccomp_reset(conf->seccomp_ctx, default_policy_action); | |
716 | if (ret != 0) { | |
3ee26d19 | 717 | ERROR("Error re-initializing Seccomp"); |
50798138 SH |
718 | return -1; |
719 | } | |
9c3798eb CB |
720 | |
721 | ret = seccomp_attr_set(conf->seccomp_ctx, SCMP_FLTATR_CTL_NNP, 0); | |
722 | if (ret < 0) { | |
723 | ERROR("%s - Failed to turn off no-new-privs", strerror(-ret)); | |
50798138 SH |
724 | return -1; |
725 | } | |
9c3798eb | 726 | |
127c5293 | 727 | #ifdef SCMP_FLTATR_ATL_TSKIP |
9c3798eb CB |
728 | ret = seccomp_attr_set(conf->seccomp_ctx, SCMP_FLTATR_ATL_TSKIP, 1); |
729 | if (ret < 0) | |
730 | WARN("%s - Failed to turn on seccomp nop-skip, continuing", strerror(-ret)); | |
127c5293 | 731 | #endif |
50798138 SH |
732 | } |
733 | ||
9c3798eb | 734 | while (getline(&rule_line, &line_bufsz, f) != -1) { |
50798138 SH |
735 | if (line[0] == '#') |
736 | continue; | |
9c3798eb CB |
737 | |
738 | if (line[0] == '\0') | |
50798138 | 739 | continue; |
9c3798eb | 740 | |
50798138 | 741 | remove_trailing_newlines(line); |
9c3798eb CB |
742 | |
743 | INFO("Processing \"%s\"", line); | |
50798138 | 744 | if (line[0] == '[') { |
1a0e70ac | 745 | /* Read the architecture for next set of rules. */ |
50798138 | 746 | if (strcmp(line, "[x86]") == 0 || |
f06c6207 | 747 | strcmp(line, "[X86]") == 0) { |
d58c6ad0 | 748 | if (native_arch != lxc_seccomp_arch_i386 && |
7e84441e | 749 | native_arch != lxc_seccomp_arch_amd64) { |
d58c6ad0 SH |
750 | cur_rule_arch = lxc_seccomp_arch_unknown; |
751 | continue; | |
752 | } | |
9c3798eb | 753 | |
d58c6ad0 | 754 | cur_rule_arch = lxc_seccomp_arch_i386; |
11de80d6 AB |
755 | } else if (strcmp(line, "[x32]") == 0 || |
756 | strcmp(line, "[X32]") == 0) { | |
757 | if (native_arch != lxc_seccomp_arch_amd64) { | |
758 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
759 | continue; | |
760 | } | |
9c3798eb | 761 | |
11de80d6 | 762 | cur_rule_arch = lxc_seccomp_arch_x32; |
d58c6ad0 | 763 | } else if (strcmp(line, "[X86_64]") == 0 || |
f06c6207 | 764 | strcmp(line, "[x86_64]") == 0) { |
d58c6ad0 SH |
765 | if (native_arch != lxc_seccomp_arch_amd64) { |
766 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
767 | continue; | |
768 | } | |
9c3798eb | 769 | |
d58c6ad0 | 770 | cur_rule_arch = lxc_seccomp_arch_amd64; |
d58c6ad0 | 771 | } else if (strcmp(line, "[all]") == 0 || |
f06c6207 | 772 | strcmp(line, "[ALL]") == 0) { |
d58c6ad0 | 773 | cur_rule_arch = lxc_seccomp_arch_all; |
d58c6ad0 | 774 | } |
2b0ae718 | 775 | #ifdef SCMP_ARCH_ARM |
50798138 | 776 | else if (strcmp(line, "[arm]") == 0 || |
f06c6207 | 777 | strcmp(line, "[ARM]") == 0) { |
7635139a | 778 | if (native_arch != lxc_seccomp_arch_arm && |
7e84441e | 779 | native_arch != lxc_seccomp_arch_arm64) { |
d58c6ad0 SH |
780 | cur_rule_arch = lxc_seccomp_arch_unknown; |
781 | continue; | |
782 | } | |
9c3798eb | 783 | |
d58c6ad0 | 784 | cur_rule_arch = lxc_seccomp_arch_arm; |
d58c6ad0 | 785 | } |
b4067426 | 786 | #endif |
9d291dd2 BP |
787 | #ifdef SCMP_ARCH_AARCH64 |
788 | else if (strcmp(line, "[arm64]") == 0 || | |
f06c6207 | 789 | strcmp(line, "[ARM64]") == 0) { |
9d291dd2 BP |
790 | if (native_arch != lxc_seccomp_arch_arm64) { |
791 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
792 | continue; | |
793 | } | |
9c3798eb | 794 | |
9d291dd2 BP |
795 | cur_rule_arch = lxc_seccomp_arch_arm64; |
796 | } | |
797 | #endif | |
b4067426 BP |
798 | #ifdef SCMP_ARCH_PPC64LE |
799 | else if (strcmp(line, "[ppc64le]") == 0 || | |
f06c6207 | 800 | strcmp(line, "[PPC64LE]") == 0) { |
b4067426 BP |
801 | if (native_arch != lxc_seccomp_arch_ppc64le) { |
802 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
803 | continue; | |
804 | } | |
9c3798eb | 805 | |
b4067426 BP |
806 | cur_rule_arch = lxc_seccomp_arch_ppc64le; |
807 | } | |
808 | #endif | |
809 | #ifdef SCMP_ARCH_PPC64 | |
810 | else if (strcmp(line, "[ppc64]") == 0 || | |
f06c6207 | 811 | strcmp(line, "[PPC64]") == 0) { |
b4067426 BP |
812 | if (native_arch != lxc_seccomp_arch_ppc64) { |
813 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
814 | continue; | |
815 | } | |
9c3798eb | 816 | |
b4067426 BP |
817 | cur_rule_arch = lxc_seccomp_arch_ppc64; |
818 | } | |
819 | #endif | |
820 | #ifdef SCMP_ARCH_PPC | |
821 | else if (strcmp(line, "[ppc]") == 0 || | |
f06c6207 | 822 | strcmp(line, "[PPC]") == 0) { |
7635139a | 823 | if (native_arch != lxc_seccomp_arch_ppc && |
7e84441e | 824 | native_arch != lxc_seccomp_arch_ppc64) { |
b4067426 BP |
825 | cur_rule_arch = lxc_seccomp_arch_unknown; |
826 | continue; | |
827 | } | |
9c3798eb | 828 | |
b4067426 BP |
829 | cur_rule_arch = lxc_seccomp_arch_ppc; |
830 | } | |
2ccd9eda JC |
831 | #endif |
832 | #ifdef SCMP_ARCH_MIPS | |
833 | else if (strcmp(line, "[mips64]") == 0 || | |
f06c6207 | 834 | strcmp(line, "[MIPS64]") == 0) { |
2ccd9eda JC |
835 | if (native_arch != lxc_seccomp_arch_mips64) { |
836 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
837 | continue; | |
838 | } | |
9c3798eb | 839 | |
2ccd9eda JC |
840 | cur_rule_arch = lxc_seccomp_arch_mips64; |
841 | } else if (strcmp(line, "[mips64n32]") == 0 || | |
f06c6207 | 842 | strcmp(line, "[MIPS64N32]") == 0) { |
2ccd9eda JC |
843 | if (native_arch != lxc_seccomp_arch_mips64) { |
844 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
845 | continue; | |
846 | } | |
9c3798eb | 847 | |
2ccd9eda JC |
848 | cur_rule_arch = lxc_seccomp_arch_mips64n32; |
849 | } else if (strcmp(line, "[mips]") == 0 || | |
f06c6207 | 850 | strcmp(line, "[MIPS]") == 0) { |
2ccd9eda | 851 | if (native_arch != lxc_seccomp_arch_mips && |
7e84441e | 852 | native_arch != lxc_seccomp_arch_mips64) { |
2ccd9eda JC |
853 | cur_rule_arch = lxc_seccomp_arch_unknown; |
854 | continue; | |
855 | } | |
9c3798eb | 856 | |
2ccd9eda JC |
857 | cur_rule_arch = lxc_seccomp_arch_mips; |
858 | } else if (strcmp(line, "[mipsel64]") == 0 || | |
f06c6207 | 859 | strcmp(line, "[MIPSEL64]") == 0) { |
2ccd9eda JC |
860 | if (native_arch != lxc_seccomp_arch_mipsel64) { |
861 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
862 | continue; | |
863 | } | |
9c3798eb | 864 | |
2ccd9eda JC |
865 | cur_rule_arch = lxc_seccomp_arch_mipsel64; |
866 | } else if (strcmp(line, "[mipsel64n32]") == 0 || | |
f06c6207 | 867 | strcmp(line, "[MIPSEL64N32]") == 0) { |
2ccd9eda JC |
868 | if (native_arch != lxc_seccomp_arch_mipsel64) { |
869 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
870 | continue; | |
871 | } | |
9c3798eb | 872 | |
2ccd9eda JC |
873 | cur_rule_arch = lxc_seccomp_arch_mipsel64n32; |
874 | } else if (strcmp(line, "[mipsel]") == 0 || | |
f06c6207 | 875 | strcmp(line, "[MIPSEL]") == 0) { |
2ccd9eda | 876 | if (native_arch != lxc_seccomp_arch_mipsel && |
7e84441e | 877 | native_arch != lxc_seccomp_arch_mipsel64) { |
2ccd9eda JC |
878 | cur_rule_arch = lxc_seccomp_arch_unknown; |
879 | continue; | |
880 | } | |
9c3798eb | 881 | |
2ccd9eda JC |
882 | cur_rule_arch = lxc_seccomp_arch_mipsel; |
883 | } | |
be038e49 CB |
884 | #endif |
885 | #ifdef SCMP_ARCH_S390X | |
886 | else if (strcmp(line, "[s390x]") == 0 || | |
f06c6207 | 887 | strcmp(line, "[S390X]") == 0) { |
be038e49 CB |
888 | if (native_arch != lxc_seccomp_arch_s390x) { |
889 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
890 | continue; | |
891 | } | |
9c3798eb | 892 | |
be038e49 | 893 | cur_rule_arch = lxc_seccomp_arch_s390x; |
2b0ae718 | 894 | #endif |
9c3798eb | 895 | } else { |
50798138 | 896 | goto bad_arch; |
9c3798eb | 897 | } |
d58c6ad0 | 898 | |
50798138 SH |
899 | continue; |
900 | } | |
901 | ||
d58c6ad0 SH |
902 | /* irrelevant arch - i.e. arm on i386 */ |
903 | if (cur_rule_arch == lxc_seccomp_arch_unknown) | |
904 | continue; | |
905 | ||
3ee26d19 | 906 | memset(&rule, 0, sizeof(rule)); |
d58c6ad0 | 907 | /* read optional action which follows the syscall */ |
3ee26d19 L |
908 | ret = parse_v2_rules(line, default_rule_action, &rule); |
909 | if (ret != 0) { | |
910 | ERROR("Failed to interpret seccomp rule"); | |
50798138 SH |
911 | goto bad_rule; |
912 | } | |
d58c6ad0 | 913 | |
eca6736e CB |
914 | if (!do_resolve_add_rule(SCMP_ARCH_NATIVE, line, |
915 | conf->seccomp_ctx, &rule)) | |
916 | goto bad_rule; | |
9c3798eb | 917 | |
eca6736e CB |
918 | INFO("Added native rule for arch %d for %s action %d(%s)", |
919 | SCMP_ARCH_NATIVE, line, rule.action, | |
920 | get_action_name(rule.action)); | |
921 | ||
922 | if (ctx.architectures[0] != SCMP_ARCH_NATIVE) { | |
923 | if (!do_resolve_add_rule(ctx.architectures[0], line, | |
924 | ctx.contexts[0], &rule)) | |
d58c6ad0 | 925 | goto bad_rule; |
9c3798eb | 926 | |
eca6736e CB |
927 | INFO("Added compat rule for arch %d for %s action %d(%s)", |
928 | ctx.architectures[0], line, rule.action, | |
3ee26d19 | 929 | get_action_name(rule.action)); |
eca6736e | 930 | } |
94d56054 | 931 | |
eca6736e CB |
932 | if (ctx.architectures[1] != SCMP_ARCH_NATIVE) { |
933 | if (!do_resolve_add_rule(ctx.architectures[1], line, | |
934 | ctx.contexts[1], &rule)) | |
d6417887 | 935 | goto bad_rule; |
9c3798eb | 936 | |
eca6736e CB |
937 | INFO("Added compat rule for arch %d for %s action %d(%s)", |
938 | ctx.architectures[1], line, rule.action, | |
3ee26d19 | 939 | get_action_name(rule.action)); |
eca6736e CB |
940 | } |
941 | ||
942 | if (ctx.architectures[2] != SCMP_ARCH_NATIVE) { | |
943 | if (!do_resolve_add_rule(ctx.architectures[2], line, | |
944 | ctx.contexts[2], &rule)) | |
d6417887 | 945 | goto bad_rule; |
9c3798eb | 946 | |
94d56054 | 947 | INFO("Added native rule for arch %d for %s action %d(%s)", |
eca6736e | 948 | ctx.architectures[2], line, rule.action, |
3ee26d19 | 949 | get_action_name(rule.action)); |
50798138 SH |
950 | } |
951 | } | |
d58c6ad0 | 952 | |
d648e178 | 953 | INFO("Merging compat seccomp contexts into main context"); |
eca6736e CB |
954 | if (ctx.contexts[0]) { |
955 | if (ctx.needs_merge[0]) { | |
956 | ret = seccomp_merge(conf->seccomp_ctx, ctx.contexts[0]); | |
b5ed021b | 957 | if (ret < 0) { |
d648e178 CB |
958 | ERROR("Failed to merge first compat seccomp " |
959 | "context into main context"); | |
b5ed021b CB |
960 | goto bad; |
961 | } | |
9c3798eb | 962 | |
b5ed021b | 963 | TRACE("Merged first compat seccomp context into main context"); |
d648e178 | 964 | } else { |
eca6736e CB |
965 | seccomp_release(ctx.contexts[0]); |
966 | ctx.contexts[0] = NULL; | |
b5ed021b | 967 | } |
d648e178 | 968 | } |
b5ed021b | 969 | |
eca6736e CB |
970 | if (ctx.contexts[1]) { |
971 | if (ctx.needs_merge[1]) { | |
972 | ret = seccomp_merge(conf->seccomp_ctx, ctx.contexts[1]); | |
b5ed021b | 973 | if (ret < 0) { |
d648e178 CB |
974 | ERROR("Failed to merge first compat seccomp " |
975 | "context into main context"); | |
b5ed021b CB |
976 | goto bad; |
977 | } | |
9c3798eb | 978 | |
b5ed021b | 979 | TRACE("Merged second compat seccomp context into main context"); |
d648e178 | 980 | } else { |
eca6736e CB |
981 | seccomp_release(ctx.contexts[1]); |
982 | ctx.contexts[1] = NULL; | |
983 | } | |
984 | } | |
985 | ||
986 | if (ctx.contexts[2]) { | |
987 | if (ctx.needs_merge[2]) { | |
988 | ret = seccomp_merge(conf->seccomp_ctx, ctx.contexts[2]); | |
989 | if (ret < 0) { | |
990 | ERROR("Failed to merge third compat seccomp " | |
991 | "context into main context"); | |
992 | goto bad; | |
993 | } | |
9c3798eb | 994 | |
eca6736e CB |
995 | TRACE("Merged third compat seccomp context into main context"); |
996 | } else { | |
997 | seccomp_release(ctx.contexts[2]); | |
998 | ctx.contexts[2] = NULL; | |
50798138 SH |
999 | } |
1000 | } | |
6166fa6d | 1001 | |
9c3798eb | 1002 | free(rule_line); |
50798138 SH |
1003 | return 0; |
1004 | ||
1005 | bad_arch: | |
9c3798eb CB |
1006 | ERROR("Unsupported architecture \"%s\"", line); |
1007 | ||
50798138 | 1008 | bad_rule: |
d58c6ad0 | 1009 | bad: |
eca6736e CB |
1010 | if (ctx.contexts[0]) |
1011 | seccomp_release(ctx.contexts[0]); | |
9c3798eb | 1012 | |
eca6736e CB |
1013 | if (ctx.contexts[1]) |
1014 | seccomp_release(ctx.contexts[1]); | |
9c3798eb | 1015 | |
eca6736e CB |
1016 | if (ctx.contexts[2]) |
1017 | seccomp_release(ctx.contexts[2]); | |
1018 | ||
9c3798eb CB |
1019 | free(rule_line); |
1020 | ||
50798138 | 1021 | return -1; |
d58c6ad0 SH |
1022 | } |
1023 | #else /* HAVE_DECL_SECCOMP_SYSCALL_RESOLVE_NAME_ARCH */ | |
1024 | static int parse_config_v2(FILE *f, char *line, struct lxc_conf *conf) | |
1025 | { | |
50798138 | 1026 | return -1; |
50798138 | 1027 | } |
d58c6ad0 | 1028 | #endif /* HAVE_DECL_SECCOMP_SYSCALL_RESOLVE_NAME_ARCH */ |
50798138 | 1029 | |
8f2c3a70 SH |
1030 | /* |
1031 | * The first line of the config file has a policy language version | |
1032 | * the second line has some directives | |
1033 | * then comes policy subject to the directives | |
998cd2f4 | 1034 | * right now version must be '1' or '2' |
1035 | * the directives must include 'whitelist'(version == 1 or 2) or 'blacklist' | |
1036 | * (version == 2) and can include 'debug' (though debug is not yet supported). | |
8f2c3a70 SH |
1037 | */ |
1038 | static int parse_config(FILE *f, struct lxc_conf *conf) | |
1039 | { | |
6ca8172d | 1040 | char line[MAXPATHLEN]; |
8f2c3a70 SH |
1041 | int ret, version; |
1042 | ||
1043 | ret = fscanf(f, "%d\n", &version); | |
50798138 | 1044 | if (ret != 1 || (version != 1 && version != 2)) { |
3ee26d19 | 1045 | ERROR("Invalid version"); |
8f2c3a70 SH |
1046 | return -1; |
1047 | } | |
6ca8172d CB |
1048 | |
1049 | if (!fgets(line, MAXPATHLEN, f)) { | |
3ee26d19 | 1050 | ERROR("Invalid config file"); |
8f2c3a70 SH |
1051 | return -1; |
1052 | } | |
6ca8172d | 1053 | |
50798138 | 1054 | if (version == 1 && !strstr(line, "whitelist")) { |
3ee26d19 | 1055 | ERROR("Only whitelist policy is supported"); |
8f2c3a70 SH |
1056 | return -1; |
1057 | } | |
50798138 | 1058 | |
8f2c3a70 | 1059 | if (strstr(line, "debug")) { |
3ee26d19 | 1060 | ERROR("Debug not yet implemented"); |
8f2c3a70 SH |
1061 | return -1; |
1062 | } | |
50798138 SH |
1063 | |
1064 | if (version == 1) | |
1065 | return parse_config_v1(f, conf); | |
6ca8172d | 1066 | |
50798138 | 1067 | return parse_config_v2(f, line, conf); |
8f2c3a70 SH |
1068 | } |
1069 | ||
cd75548b SH |
1070 | /* |
1071 | * use_seccomp: return true if we should try and apply a seccomp policy | |
1072 | * if defined for the container. | |
1073 | * This will return false if | |
1074 | * 1. seccomp is not enabled in the kernel | |
1075 | * 2. a seccomp policy is already enabled for this task | |
1076 | */ | |
1077 | static bool use_seccomp(void) | |
d58c6ad0 | 1078 | { |
d58c6ad0 | 1079 | int ret, v; |
6ca8172d CB |
1080 | FILE *f; |
1081 | size_t line_bufsz = 0; | |
1082 | char *line = NULL; | |
1083 | bool already_enabled = false, found = false; | |
d58c6ad0 | 1084 | |
6ca8172d | 1085 | f = fopen("/proc/self/status", "r"); |
d58c6ad0 | 1086 | if (!f) |
cd75548b | 1087 | return true; |
d58c6ad0 | 1088 | |
6ca8172d | 1089 | while (getline(&line, &line_bufsz, f) != -1) { |
d58c6ad0 | 1090 | if (strncmp(line, "Seccomp:", 8) == 0) { |
cd75548b | 1091 | found = true; |
6ca8172d | 1092 | |
f06c6207 | 1093 | ret = sscanf(line + 8, "%d", &v); |
cd75548b SH |
1094 | if (ret == 1 && v != 0) |
1095 | already_enabled = true; | |
6ca8172d | 1096 | |
cd75548b | 1097 | break; |
d58c6ad0 SH |
1098 | } |
1099 | } | |
6ca8172d | 1100 | free(line); |
d58c6ad0 | 1101 | fclose(f); |
6ca8172d CB |
1102 | |
1103 | if (!found) { | |
3ee26d19 | 1104 | INFO("Seccomp is not enabled in the kernel"); |
cd75548b SH |
1105 | return false; |
1106 | } | |
6ca8172d CB |
1107 | |
1108 | if (already_enabled) { | |
3ee26d19 | 1109 | INFO("Already seccomp-confined, not loading new policy"); |
cd75548b SH |
1110 | return false; |
1111 | } | |
6ca8172d | 1112 | |
cd75548b | 1113 | return true; |
d58c6ad0 SH |
1114 | } |
1115 | ||
8f2c3a70 SH |
1116 | int lxc_read_seccomp_config(struct lxc_conf *conf) |
1117 | { | |
47f6d547 | 1118 | int check_seccomp_attr_set, ret; |
8f2c3a70 | 1119 | FILE *f; |
8f2c3a70 | 1120 | |
769872f9 SH |
1121 | if (!conf->seccomp) |
1122 | return 0; | |
1123 | ||
cd75548b | 1124 | if (!use_seccomp()) |
d58c6ad0 | 1125 | return 0; |
47f6d547 | 1126 | |
769872f9 SH |
1127 | #if HAVE_SCMP_FILTER_CTX |
1128 | /* XXX for debug, pass in SCMP_ACT_TRAP */ | |
50798138 | 1129 | conf->seccomp_ctx = seccomp_init(SCMP_ACT_KILL); |
769872f9 SH |
1130 | ret = !conf->seccomp_ctx; |
1131 | #else | |
50798138 | 1132 | ret = seccomp_init(SCMP_ACT_KILL) < 0; |
769872f9 SH |
1133 | #endif |
1134 | if (ret) { | |
3ee26d19 | 1135 | ERROR("Failed initializing seccomp"); |
8f2c3a70 SH |
1136 | return -1; |
1137 | } | |
8f2c3a70 | 1138 | |
47f6d547 | 1139 | /* turn off no-new-privs. We don't want it in lxc, and it breaks |
f06c6207 | 1140 | * with apparmor */ |
769872f9 | 1141 | #if HAVE_SCMP_FILTER_CTX |
f06c6207 | 1142 | check_seccomp_attr_set = seccomp_attr_set(conf->seccomp_ctx, SCMP_FLTATR_CTL_NNP, 0); |
727c3073 | 1143 | #else |
f06c6207 | 1144 | check_seccomp_attr_set = seccomp_attr_set(SCMP_FLTATR_CTL_NNP, 0); |
769872f9 | 1145 | #endif |
727c3073 | 1146 | if (check_seccomp_attr_set) { |
47f6d547 | 1147 | ERROR("%s - Failed to turn off no-new-privs", strerror(-check_seccomp_attr_set)); |
8f2c3a70 SH |
1148 | return -1; |
1149 | } | |
127c5293 | 1150 | #ifdef SCMP_FLTATR_ATL_TSKIP |
47f6d547 CB |
1151 | check_seccomp_attr_set = seccomp_attr_set(conf->seccomp_ctx, SCMP_FLTATR_ATL_TSKIP, 1); |
1152 | if (check_seccomp_attr_set < 0) | |
1153 | WARN("%s - Failed to turn on seccomp nop-skip, continuing", | |
1154 | strerror(-check_seccomp_attr_set)); | |
127c5293 | 1155 | #endif |
8f2c3a70 SH |
1156 | |
1157 | f = fopen(conf->seccomp, "r"); | |
1158 | if (!f) { | |
3ee26d19 | 1159 | SYSERROR("Failed to open seccomp policy file %s", conf->seccomp); |
8f2c3a70 SH |
1160 | return -1; |
1161 | } | |
47f6d547 | 1162 | |
8f2c3a70 SH |
1163 | ret = parse_config(f, conf); |
1164 | fclose(f); | |
47f6d547 | 1165 | |
8f2c3a70 SH |
1166 | return ret; |
1167 | } | |
1168 | ||
1169 | int lxc_seccomp_load(struct lxc_conf *conf) | |
1170 | { | |
1171 | int ret; | |
47f6d547 | 1172 | |
8f2c3a70 SH |
1173 | if (!conf->seccomp) |
1174 | return 0; | |
47f6d547 | 1175 | |
cd75548b | 1176 | if (!use_seccomp()) |
d58c6ad0 | 1177 | return 0; |
47f6d547 | 1178 | |
769872f9 | 1179 | #if HAVE_SCMP_FILTER_CTX |
47f6d547 CB |
1180 | ret = seccomp_load(conf->seccomp_ctx); |
1181 | #else | |
1182 | ret = seccomp_load(); | |
769872f9 | 1183 | #endif |
8f2c3a70 | 1184 | if (ret < 0) { |
47f6d547 | 1185 | ERROR("%s- Error loading the seccomp policy", strerror(-ret)); |
8f2c3a70 SH |
1186 | return -1; |
1187 | } | |
5107af32 | 1188 | |
1189 | /* After load seccomp filter into the kernel successfully, export the current seccomp | |
1190 | * filter to log file */ | |
1191 | #if HAVE_SCMP_FILTER_CTX | |
47f6d547 CB |
1192 | if ((lxc_log_get_level() <= LXC_LOG_LEVEL_TRACE || |
1193 | conf->loglevel <= LXC_LOG_LEVEL_TRACE) && | |
5107af32 | 1194 | lxc_log_fd >= 0) { |
1195 | ret = seccomp_export_pfc(conf->seccomp_ctx, lxc_log_fd); | |
1196 | /* Just give an warning when export error */ | |
1197 | if (ret < 0) | |
47f6d547 | 1198 | WARN("%s - Failed to export seccomp filter to log file", strerror(-ret)); |
5107af32 | 1199 | } |
1200 | #endif | |
47f6d547 | 1201 | |
8f2c3a70 SH |
1202 | return 0; |
1203 | } | |
769872f9 | 1204 | |
f06c6207 CB |
1205 | void lxc_seccomp_free(struct lxc_conf *conf) |
1206 | { | |
f10fad2f ME |
1207 | free(conf->seccomp); |
1208 | conf->seccomp = NULL; | |
47f6d547 | 1209 | |
769872f9 SH |
1210 | #if HAVE_SCMP_FILTER_CTX |
1211 | if (conf->seccomp_ctx) { | |
1212 | seccomp_release(conf->seccomp_ctx); | |
1213 | conf->seccomp_ctx = NULL; | |
1214 | } | |
1215 | #endif | |
1216 | } |