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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 | ||
d38dd64a CB |
24 | #ifndef _GNU_SOURCE |
25 | #define _GNU_SOURCE 1 | |
26 | #endif | |
567b2049 | 27 | #include <errno.h> |
ccf8d128 | 28 | #include <seccomp.h> |
8f2c3a70 SH |
29 | #include <stdio.h> |
30 | #include <stdlib.h> | |
6166fa6d | 31 | #include <sys/mount.h> |
567b2049 | 32 | #include <sys/utsname.h> |
f2363e38 | 33 | |
e35b7bf8 | 34 | #include "af_unix.h" |
c3e3c21a | 35 | #include "commands.h" |
769872f9 | 36 | #include "config.h" |
8f2c3a70 | 37 | #include "log.h" |
cdb2a47f | 38 | #include "lxccontainer.h" |
567b2049 | 39 | #include "lxcseccomp.h" |
c3e3c21a | 40 | #include "mainloop.h" |
cdb2a47f | 41 | #include "memory_utils.h" |
eacebcc3 | 42 | #include "utils.h" |
8f2c3a70 | 43 | |
0b5c590d CB |
44 | #ifdef __MIPSEL__ |
45 | #define MIPS_ARCH_O32 lxc_seccomp_arch_mipsel | |
46 | #define MIPS_ARCH_N64 lxc_seccomp_arch_mipsel64 | |
47 | #else | |
48 | #define MIPS_ARCH_O32 lxc_seccomp_arch_mips | |
49 | #define MIPS_ARCH_N64 lxc_seccomp_arch_mips64 | |
50 | #endif | |
51 | ||
4a094eec WB |
52 | #ifndef SECCOMP_GET_NOTIF_SIZES |
53 | #define SECCOMP_GET_NOTIF_SIZES 3 | |
54 | #endif | |
55 | ||
ac2cecc4 | 56 | lxc_log_define(seccomp, lxc); |
8f2c3a70 | 57 | |
4a094eec WB |
58 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
59 | static inline int __seccomp(unsigned int operation, unsigned int flags, | |
60 | void *args) | |
61 | { | |
62 | #ifdef __NR_seccomp | |
63 | return syscall(__NR_seccomp, operation, flags, args); | |
64 | #else | |
65 | errno = ENOSYS; | |
66 | return -1; | |
67 | #endif | |
68 | } | |
69 | #endif | |
70 | ||
9dbd8ff3 | 71 | static int parse_config_v1(FILE *f, char *line, size_t *line_bufsz, struct lxc_conf *conf) |
50798138 | 72 | { |
ccf8d128 | 73 | int ret = 0; |
50798138 | 74 | |
9dbd8ff3 | 75 | while (getline(&line, line_bufsz, f) != -1) { |
50798138 | 76 | int nr; |
ccf8d128 | 77 | |
50798138 | 78 | ret = sscanf(line, "%d", &nr); |
97a9b258 WB |
79 | if (ret != 1) { |
80 | ret = -1; | |
81 | break; | |
82 | } | |
ccf8d128 | 83 | |
50798138 | 84 | #if HAVE_SCMP_FILTER_CTX |
c3e3c21a | 85 | ret = seccomp_rule_add(conf->seccomp.seccomp_ctx, SCMP_ACT_ALLOW, nr, 0); |
ccf8d128 CB |
86 | #else |
87 | ret = seccomp_rule_add(SCMP_ACT_ALLOW, nr, 0); | |
50798138 | 88 | #endif |
50798138 | 89 | if (ret < 0) { |
3ee26d19 | 90 | ERROR("Failed loading allow rule for %d", nr); |
ccf8d128 | 91 | break; |
50798138 SH |
92 | } |
93 | } | |
ccf8d128 CB |
94 | free(line); |
95 | ||
96 | return ret; | |
50798138 SH |
97 | } |
98 | ||
2b0ae718 | 99 | #if HAVE_DECL_SECCOMP_SYSCALL_RESOLVE_NAME_ARCH |
1ab6b4a1 CB |
100 | static const char *get_action_name(uint32_t action) |
101 | { | |
102 | /* The upper 16 bits indicate the type of the seccomp action. */ | |
103 | switch (action & 0xffff0000) { | |
104 | case SCMP_ACT_KILL: | |
105 | return "kill"; | |
106 | case SCMP_ACT_ALLOW: | |
107 | return "allow"; | |
108 | case SCMP_ACT_TRAP: | |
109 | return "trap"; | |
110 | case SCMP_ACT_ERRNO(0): | |
111 | return "errno"; | |
d7d2d2d9 | 112 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
02ca9d75 | 113 | case SCMP_ACT_NOTIFY: |
cdb2a47f CB |
114 | return "notify"; |
115 | #endif | |
1ab6b4a1 CB |
116 | } |
117 | ||
118 | return "invalid action"; | |
119 | } | |
120 | ||
50798138 SH |
121 | static uint32_t get_v2_default_action(char *line) |
122 | { | |
123 | uint32_t ret_action = -1; | |
124 | ||
f06c6207 CB |
125 | while (*line == ' ') |
126 | line++; | |
30448a13 | 127 | |
1a0e70ac | 128 | /* After 'whitelist' or 'blacklist' comes default behavior. */ |
30448a13 | 129 | if (strncmp(line, "kill", 4) == 0) { |
50798138 | 130 | ret_action = SCMP_ACT_KILL; |
30448a13 CB |
131 | } else if (strncmp(line, "errno", 5) == 0) { |
132 | int e, ret; | |
133 | ||
134 | ret = sscanf(line + 5, "%d", &e); | |
135 | if (ret != 1) { | |
136 | ERROR("Failed to parse errno value from %s", line); | |
50798138 SH |
137 | return -2; |
138 | } | |
30448a13 | 139 | |
50798138 | 140 | ret_action = SCMP_ACT_ERRNO(e); |
30448a13 | 141 | } else if (strncmp(line, "allow", 5) == 0) { |
50798138 | 142 | ret_action = SCMP_ACT_ALLOW; |
30448a13 | 143 | } else if (strncmp(line, "trap", 4) == 0) { |
50798138 | 144 | ret_action = SCMP_ACT_TRAP; |
d7d2d2d9 | 145 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
cdb2a47f | 146 | } else if (strncmp(line, "notify", 6) == 0) { |
02ca9d75 | 147 | ret_action = SCMP_ACT_NOTIFY; |
cdb2a47f | 148 | #endif |
7474b5b3 | 149 | } else if (line[0]) { |
54a051c1 | 150 | ERROR("Unrecognized seccomp action \"%s\"", line); |
7474b5b3 | 151 | return -2; |
30448a13 CB |
152 | } |
153 | ||
50798138 SH |
154 | return ret_action; |
155 | } | |
156 | ||
3ee26d19 | 157 | static uint32_t get_v2_action(char *line, uint32_t def_action) |
50798138 | 158 | { |
1ab6b4a1 | 159 | char *p; |
50798138 SH |
160 | uint32_t ret; |
161 | ||
1ab6b4a1 | 162 | p = strchr(line, ' '); |
50798138 SH |
163 | if (!p) |
164 | return def_action; | |
50798138 | 165 | p++; |
1ab6b4a1 | 166 | |
50798138 SH |
167 | while (*p == ' ') |
168 | p++; | |
1ab6b4a1 | 169 | |
50798138 SH |
170 | if (!*p || *p == '#') |
171 | return def_action; | |
1ab6b4a1 | 172 | |
50798138 | 173 | ret = get_v2_default_action(p); |
1ab6b4a1 CB |
174 | switch (ret) { |
175 | case -2: | |
176 | return -1; | |
177 | case -1: | |
178 | return def_action; | |
50798138 | 179 | } |
1ab6b4a1 CB |
180 | |
181 | return ret; | |
50798138 | 182 | } |
3ee26d19 | 183 | |
63a49b03 | 184 | struct seccomp_v2_rule_args { |
3ee26d19 L |
185 | uint32_t index; |
186 | uint64_t value; | |
187 | uint64_t mask; | |
188 | enum scmp_compare op; | |
189 | }; | |
190 | ||
191 | struct seccomp_v2_rule { | |
192 | uint32_t action; | |
193 | uint32_t args_num; | |
63a49b03 | 194 | struct seccomp_v2_rule_args args_value[6]; |
3ee26d19 L |
195 | }; |
196 | ||
197 | static enum scmp_compare parse_v2_rule_op(char *s) | |
198 | { | |
3ee26d19 | 199 | if (strcmp(s, "SCMP_CMP_NE") == 0 || strcmp(s, "!=") == 0) |
29cb2617 | 200 | return SCMP_CMP_NE; |
3ee26d19 | 201 | else if (strcmp(s, "SCMP_CMP_LT") == 0 || strcmp(s, "<") == 0) |
29cb2617 | 202 | return SCMP_CMP_LT; |
3ee26d19 | 203 | else if (strcmp(s, "SCMP_CMP_LE") == 0 || strcmp(s, "<=") == 0) |
29cb2617 | 204 | return SCMP_CMP_LE; |
3ee26d19 | 205 | else if (strcmp(s, "SCMP_CMP_EQ") == 0 || strcmp(s, "==") == 0) |
29cb2617 | 206 | return SCMP_CMP_EQ; |
3ee26d19 | 207 | else if (strcmp(s, "SCMP_CMP_GE") == 0 || strcmp(s, ">=") == 0) |
29cb2617 | 208 | return SCMP_CMP_GE; |
3ee26d19 | 209 | else if (strcmp(s, "SCMP_CMP_GT") == 0 || strcmp(s, ">") == 0) |
29cb2617 | 210 | return SCMP_CMP_GT; |
3ee26d19 | 211 | else if (strcmp(s, "SCMP_CMP_MASKED_EQ") == 0 || strcmp(s, "&=") == 0) |
29cb2617 | 212 | return SCMP_CMP_MASKED_EQ; |
3ee26d19 | 213 | |
29cb2617 | 214 | return _SCMP_CMP_MAX; |
3ee26d19 L |
215 | } |
216 | ||
63a49b03 CB |
217 | /* |
218 | * This function is used to parse the args string into the structure. | |
73e3cb9a | 219 | * args string format:[index,value,op,mask] or [index,value,op] |
3ee26d19 L |
220 | * index: the index for syscall arguments (type uint) |
221 | * value: the value for syscall arguments (type uint64) | |
222 | * op: the operator for syscall arguments(string), | |
223 | a valid list of constants as of libseccomp v2.3.2 is | |
224 | SCMP_CMP_NE,SCMP_CMP_LE,SCMP_CMP_LE, SCMP_CMP_EQ, SCMP_CMP_GE, | |
225 | SCMP_CMP_GT, SCMP_CMP_MASKED_EQ, or !=,<=,==,>=,>,&= | |
73e3cb9a | 226 | * mask: the mask to apply on "value" for SCMP_CMP_MASKED_EQ (type uint64, optional) |
3ee26d19 L |
227 | * Returns 0 on success, < 0 otherwise. |
228 | */ | |
63a49b03 | 229 | static int get_seccomp_arg_value(char *key, struct seccomp_v2_rule_args *rule_args) |
3ee26d19 L |
230 | { |
231 | int ret = 0; | |
3ee26d19 | 232 | uint32_t index = 0; |
63a49b03 CB |
233 | uint64_t mask = 0, value = 0; |
234 | enum scmp_compare op = 0; | |
3ee26d19 | 235 | char *tmp = NULL; |
f42183e6 | 236 | char s[31] = {0}, v[24] = {0}, m[24] = {'0'}; |
3ee26d19 | 237 | |
3ee26d19 L |
238 | tmp = strchr(key, '['); |
239 | if (!tmp) { | |
240 | ERROR("Failed to interpret args"); | |
241 | return -1; | |
242 | } | |
63a49b03 | 243 | |
eacebcc3 | 244 | ret = sscanf(tmp, "[%i,%23[^,],%30[^0-9^,],%23[^,]", &index, v, s, m); |
3ee26d19 L |
245 | if ((ret != 3 && ret != 4) || index >= 6) { |
246 | ERROR("Failed to interpret args value"); | |
247 | return -1; | |
248 | } | |
249 | ||
573ad77f | 250 | ret = lxc_safe_uint64(v, &value, 0); |
eacebcc3 FA |
251 | if (ret < 0) { |
252 | ERROR("Invalid argument value"); | |
253 | return -1; | |
254 | } | |
255 | ||
573ad77f | 256 | ret = lxc_safe_uint64(m, &mask, 0); |
eacebcc3 FA |
257 | if (ret < 0) { |
258 | ERROR("Invalid argument mask"); | |
259 | return -1; | |
260 | } | |
261 | ||
3ee26d19 L |
262 | op = parse_v2_rule_op(s); |
263 | if (op == _SCMP_CMP_MAX) { | |
264 | ERROR("Failed to interpret args operator value"); | |
265 | return -1; | |
266 | } | |
267 | ||
268 | rule_args->index = index; | |
269 | rule_args->value = value; | |
270 | rule_args->mask = mask; | |
271 | rule_args->op = op; | |
272 | return 0; | |
273 | } | |
274 | ||
275 | /* This function is used to parse the seccomp rule entry. | |
276 | * @line : seccomp rule entry string. | |
277 | * @def_action : default action used in the case if the 'line' contain non valid action. | |
278 | * @rules : output struct. | |
279 | * Returns 0 on success, < 0 otherwise. | |
280 | */ | |
f67c94d0 CB |
281 | static int parse_v2_rules(char *line, uint32_t def_action, |
282 | struct seccomp_v2_rule *rules) | |
3ee26d19 | 283 | { |
f67c94d0 CB |
284 | int i = 0, ret = -1; |
285 | char *key = NULL, *saveptr = NULL, *tmp = NULL; | |
3ee26d19 L |
286 | |
287 | tmp = strdup(line); | |
288 | if (!tmp) | |
289 | return -1; | |
290 | ||
291 | /* read optional action which follows the syscall */ | |
292 | rules->action = get_v2_action(tmp, def_action); | |
f858dd50 WB |
293 | if (rules->action == -1) { |
294 | ERROR("Failed to interpret action"); | |
295 | ret = -1; | |
54a051c1 | 296 | goto on_error; |
f858dd50 | 297 | } |
3ee26d19 | 298 | |
f67c94d0 | 299 | ret = 0; |
3ee26d19 | 300 | rules->args_num = 0; |
f67c94d0 | 301 | if (!strchr(tmp, '[')) |
54a051c1 | 302 | goto on_error; |
3ee26d19 | 303 | |
f67c94d0 CB |
304 | ret = -1; |
305 | for ((key = strtok_r(tmp, "]", &saveptr)), i = 0; key && i < 6; | |
306 | (key = strtok_r(NULL, "]", &saveptr)), i++) { | |
3ee26d19 | 307 | ret = get_seccomp_arg_value(key, &rules->args_value[i]); |
f67c94d0 | 308 | if (ret < 0) |
54a051c1 | 309 | goto on_error; |
f67c94d0 | 310 | |
3ee26d19 L |
311 | rules->args_num++; |
312 | } | |
313 | ||
314 | ret = 0; | |
f67c94d0 | 315 | |
54a051c1 | 316 | on_error: |
3ee26d19 | 317 | free(tmp); |
f67c94d0 | 318 | |
3ee26d19 L |
319 | return ret; |
320 | } | |
2b0ae718 | 321 | #endif |
50798138 | 322 | |
d58c6ad0 | 323 | #if HAVE_DECL_SECCOMP_SYSCALL_RESOLVE_NAME_ARCH |
3e9671a1 | 324 | enum lxc_hostarch_t { |
d58c6ad0 SH |
325 | lxc_seccomp_arch_all = 0, |
326 | lxc_seccomp_arch_native, | |
327 | lxc_seccomp_arch_i386, | |
11de80d6 | 328 | lxc_seccomp_arch_x32, |
d58c6ad0 SH |
329 | lxc_seccomp_arch_amd64, |
330 | lxc_seccomp_arch_arm, | |
9d291dd2 | 331 | lxc_seccomp_arch_arm64, |
b4067426 BP |
332 | lxc_seccomp_arch_ppc64, |
333 | lxc_seccomp_arch_ppc64le, | |
334 | lxc_seccomp_arch_ppc, | |
2ccd9eda JC |
335 | lxc_seccomp_arch_mips, |
336 | lxc_seccomp_arch_mips64, | |
337 | lxc_seccomp_arch_mips64n32, | |
338 | lxc_seccomp_arch_mipsel, | |
339 | lxc_seccomp_arch_mipsel64, | |
340 | lxc_seccomp_arch_mipsel64n32, | |
be038e49 | 341 | lxc_seccomp_arch_s390x, |
d58c6ad0 SH |
342 | lxc_seccomp_arch_unknown = 999, |
343 | }; | |
344 | ||
345 | int get_hostarch(void) | |
346 | { | |
347 | struct utsname uts; | |
348 | if (uname(&uts) < 0) { | |
3ee26d19 | 349 | SYSERROR("Failed to read host arch"); |
d58c6ad0 SH |
350 | return -1; |
351 | } | |
0197fe2e | 352 | |
d58c6ad0 SH |
353 | if (strcmp(uts.machine, "i686") == 0) |
354 | return lxc_seccomp_arch_i386; | |
1a0e70ac | 355 | /* no x32 kernels */ |
d58c6ad0 SH |
356 | else if (strcmp(uts.machine, "x86_64") == 0) |
357 | return lxc_seccomp_arch_amd64; | |
358 | else if (strncmp(uts.machine, "armv7", 5) == 0) | |
359 | return lxc_seccomp_arch_arm; | |
9d291dd2 BP |
360 | else if (strncmp(uts.machine, "aarch64", 7) == 0) |
361 | return lxc_seccomp_arch_arm64; | |
b4067426 BP |
362 | else if (strncmp(uts.machine, "ppc64le", 7) == 0) |
363 | return lxc_seccomp_arch_ppc64le; | |
364 | else if (strncmp(uts.machine, "ppc64", 5) == 0) | |
365 | return lxc_seccomp_arch_ppc64; | |
366 | else if (strncmp(uts.machine, "ppc", 3) == 0) | |
367 | return lxc_seccomp_arch_ppc; | |
2ccd9eda JC |
368 | else if (strncmp(uts.machine, "mips64", 6) == 0) |
369 | return MIPS_ARCH_N64; | |
370 | else if (strncmp(uts.machine, "mips", 4) == 0) | |
371 | return MIPS_ARCH_O32; | |
be038e49 CB |
372 | else if (strncmp(uts.machine, "s390x", 5) == 0) |
373 | return lxc_seccomp_arch_s390x; | |
0197fe2e | 374 | |
d58c6ad0 SH |
375 | return lxc_seccomp_arch_unknown; |
376 | } | |
377 | ||
3e9671a1 CB |
378 | scmp_filter_ctx get_new_ctx(enum lxc_hostarch_t n_arch, |
379 | uint32_t default_policy_action, bool *needs_merge) | |
d58c6ad0 | 380 | { |
d58c6ad0 SH |
381 | int ret; |
382 | uint32_t arch; | |
04263914 | 383 | scmp_filter_ctx ctx; |
d58c6ad0 | 384 | |
04263914 CB |
385 | switch (n_arch) { |
386 | case lxc_seccomp_arch_i386: | |
387 | arch = SCMP_ARCH_X86; | |
388 | break; | |
389 | case lxc_seccomp_arch_x32: | |
390 | arch = SCMP_ARCH_X32; | |
391 | break; | |
392 | case lxc_seccomp_arch_amd64: | |
393 | arch = SCMP_ARCH_X86_64; | |
394 | break; | |
395 | case lxc_seccomp_arch_arm: | |
396 | arch = SCMP_ARCH_ARM; | |
397 | break; | |
9d291dd2 | 398 | #ifdef SCMP_ARCH_AARCH64 |
04263914 CB |
399 | case lxc_seccomp_arch_arm64: |
400 | arch = SCMP_ARCH_AARCH64; | |
401 | break; | |
9d291dd2 | 402 | #endif |
b4067426 | 403 | #ifdef SCMP_ARCH_PPC64LE |
04263914 CB |
404 | case lxc_seccomp_arch_ppc64le: |
405 | arch = SCMP_ARCH_PPC64LE; | |
406 | break; | |
b4067426 BP |
407 | #endif |
408 | #ifdef SCMP_ARCH_PPC64 | |
04263914 CB |
409 | case lxc_seccomp_arch_ppc64: |
410 | arch = SCMP_ARCH_PPC64; | |
411 | break; | |
b4067426 BP |
412 | #endif |
413 | #ifdef SCMP_ARCH_PPC | |
04263914 CB |
414 | case lxc_seccomp_arch_ppc: |
415 | arch = SCMP_ARCH_PPC; | |
416 | break; | |
2ccd9eda JC |
417 | #endif |
418 | #ifdef SCMP_ARCH_MIPS | |
04263914 CB |
419 | case lxc_seccomp_arch_mips: |
420 | arch = SCMP_ARCH_MIPS; | |
421 | break; | |
422 | case lxc_seccomp_arch_mips64: | |
423 | arch = SCMP_ARCH_MIPS64; | |
424 | break; | |
425 | case lxc_seccomp_arch_mips64n32: | |
426 | arch = SCMP_ARCH_MIPS64N32; | |
427 | break; | |
428 | case lxc_seccomp_arch_mipsel: | |
429 | arch = SCMP_ARCH_MIPSEL; | |
430 | break; | |
431 | case lxc_seccomp_arch_mipsel64: | |
432 | arch = SCMP_ARCH_MIPSEL64; | |
433 | break; | |
434 | case lxc_seccomp_arch_mipsel64n32: | |
435 | arch = SCMP_ARCH_MIPSEL64N32; | |
436 | break; | |
be038e49 CB |
437 | #endif |
438 | #ifdef SCMP_ARCH_S390X | |
04263914 CB |
439 | case lxc_seccomp_arch_s390x: |
440 | arch = SCMP_ARCH_S390X; | |
441 | break; | |
b4067426 | 442 | #endif |
04263914 CB |
443 | default: |
444 | return NULL; | |
d58c6ad0 SH |
445 | } |
446 | ||
04263914 CB |
447 | ctx = seccomp_init(default_policy_action); |
448 | if (!ctx) { | |
3ee26d19 | 449 | ERROR("Error initializing seccomp context"); |
d58c6ad0 SH |
450 | return NULL; |
451 | } | |
04263914 CB |
452 | |
453 | ret = seccomp_attr_set(ctx, SCMP_FLTATR_CTL_NNP, 0); | |
454 | if (ret < 0) { | |
6d1400b5 | 455 | errno = -ret; |
456 | SYSERROR("Failed to turn off no-new-privs"); | |
d58c6ad0 SH |
457 | seccomp_release(ctx); |
458 | return NULL; | |
459 | } | |
04263914 | 460 | |
127c5293 | 461 | #ifdef SCMP_FLTATR_ATL_TSKIP |
04263914 | 462 | ret = seccomp_attr_set(ctx, SCMP_FLTATR_ATL_TSKIP, 1); |
a24c5678 | 463 | if (ret < 0) { |
464 | errno = -ret; | |
465 | SYSWARN("Failed to turn on seccomp nop-skip, continuing"); | |
466 | } | |
127c5293 | 467 | #endif |
b5ed021b | 468 | |
adfee3a8 CB |
469 | ret = seccomp_arch_exist(ctx, arch); |
470 | if (ret < 0) { | |
471 | if (ret != -EEXIST) { | |
6d1400b5 | 472 | errno = -ret; |
473 | SYSERROR("Failed to determine whether arch %d is " | |
474 | "already present in the main seccomp context", | |
475 | (int)n_arch); | |
adfee3a8 CB |
476 | seccomp_release(ctx); |
477 | return NULL; | |
478 | } | |
479 | ||
b5ed021b CB |
480 | ret = seccomp_arch_add(ctx, arch); |
481 | if (ret != 0) { | |
6d1400b5 | 482 | errno = -ret; |
483 | SYSERROR("Failed to add arch %d to main seccomp context", | |
484 | (int)n_arch); | |
b5ed021b CB |
485 | seccomp_release(ctx); |
486 | return NULL; | |
487 | } | |
adfee3a8 | 488 | TRACE("Added arch %d to main seccomp context", (int)n_arch); |
b5ed021b | 489 | |
adfee3a8 CB |
490 | ret = seccomp_arch_remove(ctx, SCMP_ARCH_NATIVE); |
491 | if (ret != 0) { | |
492 | ERROR("Failed to remove native arch from main seccomp context"); | |
b5ed021b CB |
493 | seccomp_release(ctx); |
494 | return NULL; | |
495 | } | |
adfee3a8 | 496 | TRACE("Removed native arch from main seccomp context"); |
3e9671a1 CB |
497 | |
498 | *needs_merge = true; | |
adfee3a8 | 499 | } else { |
3e9671a1 | 500 | *needs_merge = false; |
adfee3a8 | 501 | TRACE("Arch %d already present in main seccomp context", (int)n_arch); |
d58c6ad0 SH |
502 | } |
503 | ||
504 | return ctx; | |
505 | } | |
506 | ||
507 | bool do_resolve_add_rule(uint32_t arch, char *line, scmp_filter_ctx ctx, | |
ad9a5b72 | 508 | struct seccomp_v2_rule *rule) |
d58c6ad0 | 509 | { |
ad9a5b72 | 510 | int i, nr, ret; |
3ee26d19 L |
511 | struct scmp_arg_cmp arg_cmp[6]; |
512 | ||
f06c6207 CB |
513 | ret = seccomp_arch_exist(ctx, arch); |
514 | if (arch && ret != 0) { | |
6d1400b5 | 515 | errno = -ret; |
516 | SYSERROR("Seccomp: rule and context arch do not match (arch %d)", arch); | |
d58c6ad0 SH |
517 | return false; |
518 | } | |
6166fa6d | 519 | |
3ee26d19 L |
520 | /*get the syscall name*/ |
521 | char *p = strchr(line, ' '); | |
522 | if (p) | |
523 | *p = '\0'; | |
524 | ||
6166fa6d | 525 | if (strncmp(line, "reject_force_umount", 19) == 0) { |
ad9a5b72 CB |
526 | ret = seccomp_rule_add_exact(ctx, SCMP_ACT_ERRNO(EACCES), |
527 | SCMP_SYS(umount2), 1, | |
528 | SCMP_A1(SCMP_CMP_MASKED_EQ, MNT_FORCE, MNT_FORCE)); | |
6166fa6d | 529 | if (ret < 0) { |
6d1400b5 | 530 | errno = -ret; |
531 | SYSERROR("Failed loading rule to reject force umount"); | |
6166fa6d SH |
532 | return false; |
533 | } | |
ad9a5b72 CB |
534 | |
535 | INFO("Set seccomp rule to reject force umounts"); | |
6166fa6d SH |
536 | return true; |
537 | } | |
538 | ||
cd75548b | 539 | nr = seccomp_syscall_resolve_name(line); |
d58c6ad0 | 540 | if (nr == __NR_SCMP_ERROR) { |
ad9a5b72 | 541 | WARN("Failed to resolve syscall \"%s\"", line); |
8c26014b | 542 | WARN("This syscall will NOT be handled by seccomp"); |
24b9874f | 543 | return true; |
d58c6ad0 | 544 | } |
ad9a5b72 | 545 | |
d58c6ad0 | 546 | if (nr < 0) { |
ad9a5b72 | 547 | WARN("Got negative return value %d for syscall \"%s\"", nr, line); |
8c26014b | 548 | WARN("This syscall will NOT be handled by seccomp"); |
24b9874f | 549 | return true; |
d58c6ad0 | 550 | } |
3ee26d19 | 551 | |
ad9a5b72 | 552 | memset(&arg_cmp, 0, sizeof(arg_cmp)); |
3ee26d19 | 553 | for (i = 0; i < rule->args_num; i++) { |
ad9a5b72 CB |
554 | INFO("arg_cmp[%d]: SCMP_CMP(%u, %llu, %llu, %llu)", i, |
555 | rule->args_value[i].index, | |
556 | (long long unsigned int)rule->args_value[i].op, | |
557 | (long long unsigned int)rule->args_value[i].mask, | |
558 | (long long unsigned int)rule->args_value[i].value); | |
3ee26d19 L |
559 | |
560 | if (SCMP_CMP_MASKED_EQ == rule->args_value[i].op) | |
ad9a5b72 CB |
561 | arg_cmp[i] = SCMP_CMP(rule->args_value[i].index, |
562 | rule->args_value[i].op, | |
563 | rule->args_value[i].mask, | |
564 | rule->args_value[i].value); | |
3ee26d19 | 565 | else |
ad9a5b72 CB |
566 | arg_cmp[i] = SCMP_CMP(rule->args_value[i].index, |
567 | rule->args_value[i].op, | |
568 | rule->args_value[i].value); | |
3ee26d19 L |
569 | } |
570 | ||
ad9a5b72 CB |
571 | ret = seccomp_rule_add_exact_array(ctx, rule->action, nr, |
572 | rule->args_num, arg_cmp); | |
d58c6ad0 | 573 | if (ret < 0) { |
6d1400b5 | 574 | errno = -ret; |
575 | SYSERROR("Failed loading rule for %s (nr %d action %d (%s))", | |
576 | line, nr, rule->action, get_action_name(rule->action)); | |
d58c6ad0 SH |
577 | return false; |
578 | } | |
ad9a5b72 | 579 | |
d58c6ad0 SH |
580 | return true; |
581 | } | |
582 | ||
50798138 SH |
583 | /* |
584 | * v2 consists of | |
585 | * [x86] | |
586 | * open | |
587 | * read | |
588 | * write | |
589 | * close | |
590 | * # a comment | |
591 | * [x86_64] | |
592 | * open | |
593 | * read | |
594 | * write | |
595 | * close | |
596 | */ | |
9dbd8ff3 | 597 | static int parse_config_v2(FILE *f, char *line, size_t *line_bufsz, struct lxc_conf *conf) |
50798138 | 598 | { |
50798138 | 599 | int ret; |
9c3798eb | 600 | char *p; |
3e9671a1 | 601 | enum lxc_hostarch_t cur_rule_arch, native_arch; |
50798138 | 602 | bool blacklist = false; |
3ee26d19 | 603 | uint32_t default_policy_action = -1, default_rule_action = -1; |
3ee26d19 | 604 | struct seccomp_v2_rule rule; |
3e9671a1 CB |
605 | struct scmp_ctx_info { |
606 | uint32_t architectures[3]; | |
607 | scmp_filter_ctx contexts[3]; | |
608 | bool needs_merge[3]; | |
609 | } ctx; | |
50798138 SH |
610 | |
611 | if (strncmp(line, "blacklist", 9) == 0) | |
612 | blacklist = true; | |
613 | else if (strncmp(line, "whitelist", 9) != 0) { | |
9c3798eb | 614 | ERROR("Bad seccomp policy style \"%s\"", line); |
50798138 SH |
615 | return -1; |
616 | } | |
617 | ||
9c3798eb CB |
618 | p = strchr(line, ' '); |
619 | if (p) { | |
f06c6207 | 620 | default_policy_action = get_v2_default_action(p + 1); |
50798138 SH |
621 | if (default_policy_action == -2) |
622 | return -1; | |
623 | } | |
624 | ||
625 | /* for blacklist, allow any syscall which has no rule */ | |
626 | if (blacklist) { | |
627 | if (default_policy_action == -1) | |
628 | default_policy_action = SCMP_ACT_ALLOW; | |
9c3798eb | 629 | |
50798138 SH |
630 | if (default_rule_action == -1) |
631 | default_rule_action = SCMP_ACT_KILL; | |
632 | } else { | |
633 | if (default_policy_action == -1) | |
634 | default_policy_action = SCMP_ACT_KILL; | |
9c3798eb | 635 | |
50798138 SH |
636 | if (default_rule_action == -1) |
637 | default_rule_action = SCMP_ACT_ALLOW; | |
638 | } | |
639 | ||
eca6736e CB |
640 | memset(&ctx, 0, sizeof(ctx)); |
641 | ctx.architectures[0] = SCMP_ARCH_NATIVE; | |
642 | ctx.architectures[1] = SCMP_ARCH_NATIVE; | |
643 | ctx.architectures[2] = SCMP_ARCH_NATIVE; | |
9c3798eb CB |
644 | native_arch = get_hostarch(); |
645 | cur_rule_arch = native_arch; | |
d58c6ad0 SH |
646 | if (native_arch == lxc_seccomp_arch_amd64) { |
647 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
648 | |
649 | ctx.architectures[0] = SCMP_ARCH_X86; | |
650 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_i386, | |
3e9671a1 CB |
651 | default_policy_action, |
652 | &ctx.needs_merge[0]); | |
eca6736e CB |
653 | if (!ctx.contexts[0]) |
654 | goto bad; | |
655 | ||
656 | ctx.architectures[1] = SCMP_ARCH_X32; | |
657 | ctx.contexts[1] = get_new_ctx(lxc_seccomp_arch_x32, | |
3e9671a1 CB |
658 | default_policy_action, |
659 | &ctx.needs_merge[1]); | |
eca6736e CB |
660 | if (!ctx.contexts[1]) |
661 | goto bad; | |
662 | ||
663 | ctx.architectures[2] = SCMP_ARCH_X86_64; | |
664 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_amd64, | |
3e9671a1 CB |
665 | default_policy_action, |
666 | &ctx.needs_merge[2]); | |
eca6736e | 667 | if (!ctx.contexts[2]) |
ab5e52f6 | 668 | goto bad; |
ca399594 | 669 | #ifdef SCMP_ARCH_PPC |
7635139a SH |
670 | } else if (native_arch == lxc_seccomp_arch_ppc64) { |
671 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
672 | |
673 | ctx.architectures[0] = SCMP_ARCH_PPC; | |
674 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_ppc, | |
3e9671a1 CB |
675 | default_policy_action, |
676 | &ctx.needs_merge[0]); | |
eca6736e CB |
677 | if (!ctx.contexts[0]) |
678 | goto bad; | |
679 | ||
3e9671a1 CB |
680 | ctx.architectures[2] = SCMP_ARCH_PPC64; |
681 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_ppc64, | |
682 | default_policy_action, | |
683 | &ctx.needs_merge[2]); | |
684 | if (!ctx.contexts[2]) | |
7635139a | 685 | goto bad; |
ca399594 CB |
686 | #endif |
687 | #ifdef SCMP_ARCH_ARM | |
7635139a SH |
688 | } else if (native_arch == lxc_seccomp_arch_arm64) { |
689 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
690 | |
691 | ctx.architectures[0] = SCMP_ARCH_ARM; | |
9c3798eb | 692 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_arm, |
3e9671a1 CB |
693 | default_policy_action, |
694 | &ctx.needs_merge[0]); | |
eca6736e CB |
695 | if (!ctx.contexts[0]) |
696 | goto bad; | |
697 | ||
b1c428f9 | 698 | #ifdef SCMP_ARCH_AARCH64 |
3e9671a1 CB |
699 | ctx.architectures[2] = SCMP_ARCH_AARCH64; |
700 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_arm64, | |
701 | default_policy_action, | |
702 | &ctx.needs_merge[2]); | |
703 | if (!ctx.contexts[2]) | |
2ccd9eda JC |
704 | goto bad; |
705 | #endif | |
b1c428f9 | 706 | #endif |
2ccd9eda JC |
707 | #ifdef SCMP_ARCH_MIPS |
708 | } else if (native_arch == lxc_seccomp_arch_mips64) { | |
709 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
710 | |
711 | ctx.architectures[0] = SCMP_ARCH_MIPS; | |
712 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_mips, | |
3e9671a1 CB |
713 | default_policy_action, |
714 | &ctx.needs_merge[0]); | |
eca6736e CB |
715 | if (!ctx.contexts[0]) |
716 | goto bad; | |
717 | ||
718 | ctx.architectures[1] = SCMP_ARCH_MIPS64N32; | |
719 | ctx.contexts[1] = get_new_ctx(lxc_seccomp_arch_mips64n32, | |
3e9671a1 CB |
720 | default_policy_action, |
721 | &ctx.needs_merge[1]); | |
eca6736e CB |
722 | if (!ctx.contexts[1]) |
723 | goto bad; | |
724 | ||
725 | ctx.architectures[2] = SCMP_ARCH_MIPS64; | |
726 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_mips64, | |
3e9671a1 CB |
727 | default_policy_action, |
728 | &ctx.needs_merge[2]); | |
eca6736e | 729 | if (!ctx.contexts[2]) |
2ccd9eda JC |
730 | goto bad; |
731 | } else if (native_arch == lxc_seccomp_arch_mipsel64) { | |
732 | cur_rule_arch = lxc_seccomp_arch_all; | |
eca6736e CB |
733 | |
734 | ctx.architectures[0] = SCMP_ARCH_MIPSEL; | |
735 | ctx.contexts[0] = get_new_ctx(lxc_seccomp_arch_mipsel, | |
3e9671a1 CB |
736 | default_policy_action, |
737 | &ctx.needs_merge[0]); | |
eca6736e CB |
738 | if (!ctx.contexts[0]) |
739 | goto bad; | |
740 | ||
741 | ctx.architectures[1] = SCMP_ARCH_MIPSEL64N32; | |
742 | ctx.contexts[1] = get_new_ctx(lxc_seccomp_arch_mipsel64n32, | |
3e9671a1 CB |
743 | default_policy_action, |
744 | &ctx.needs_merge[1]); | |
eca6736e CB |
745 | if (!ctx.contexts[1]) |
746 | goto bad; | |
747 | ||
748 | ctx.architectures[2] = SCMP_ARCH_MIPSEL64; | |
749 | ctx.contexts[2] = get_new_ctx(lxc_seccomp_arch_mipsel64, | |
3e9671a1 CB |
750 | default_policy_action, |
751 | &ctx.needs_merge[2]); | |
eca6736e | 752 | if (!ctx.contexts[2]) |
7635139a | 753 | goto bad; |
be038e49 | 754 | #endif |
d58c6ad0 SH |
755 | } |
756 | ||
50798138 | 757 | if (default_policy_action != SCMP_ACT_KILL) { |
c3e3c21a | 758 | ret = seccomp_reset(conf->seccomp.seccomp_ctx, default_policy_action); |
50798138 | 759 | if (ret != 0) { |
3ee26d19 | 760 | ERROR("Error re-initializing Seccomp"); |
50798138 SH |
761 | return -1; |
762 | } | |
9c3798eb | 763 | |
c3e3c21a | 764 | ret = seccomp_attr_set(conf->seccomp.seccomp_ctx, SCMP_FLTATR_CTL_NNP, 0); |
9c3798eb | 765 | if (ret < 0) { |
6d1400b5 | 766 | errno = -ret; |
767 | SYSERROR("Failed to turn off no-new-privs"); | |
50798138 SH |
768 | return -1; |
769 | } | |
9c3798eb | 770 | |
127c5293 | 771 | #ifdef SCMP_FLTATR_ATL_TSKIP |
c3e3c21a | 772 | ret = seccomp_attr_set(conf->seccomp.seccomp_ctx, SCMP_FLTATR_ATL_TSKIP, 1); |
a24c5678 | 773 | if (ret < 0) { |
774 | errno = -ret; | |
775 | SYSWARN("Failed to turn on seccomp nop-skip, continuing"); | |
776 | } | |
127c5293 | 777 | #endif |
50798138 SH |
778 | } |
779 | ||
9dbd8ff3 | 780 | while (getline(&line, line_bufsz, f) != -1) { |
50798138 SH |
781 | if (line[0] == '#') |
782 | continue; | |
9c3798eb CB |
783 | |
784 | if (line[0] == '\0') | |
50798138 | 785 | continue; |
9c3798eb | 786 | |
50798138 | 787 | remove_trailing_newlines(line); |
9c3798eb CB |
788 | |
789 | INFO("Processing \"%s\"", line); | |
50798138 | 790 | if (line[0] == '[') { |
1a0e70ac | 791 | /* Read the architecture for next set of rules. */ |
50798138 | 792 | if (strcmp(line, "[x86]") == 0 || |
f06c6207 | 793 | strcmp(line, "[X86]") == 0) { |
d58c6ad0 | 794 | if (native_arch != lxc_seccomp_arch_i386 && |
7e84441e | 795 | native_arch != lxc_seccomp_arch_amd64) { |
d58c6ad0 SH |
796 | cur_rule_arch = lxc_seccomp_arch_unknown; |
797 | continue; | |
798 | } | |
9c3798eb | 799 | |
d58c6ad0 | 800 | cur_rule_arch = lxc_seccomp_arch_i386; |
11de80d6 AB |
801 | } else if (strcmp(line, "[x32]") == 0 || |
802 | strcmp(line, "[X32]") == 0) { | |
803 | if (native_arch != lxc_seccomp_arch_amd64) { | |
804 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
805 | continue; | |
806 | } | |
9c3798eb | 807 | |
11de80d6 | 808 | cur_rule_arch = lxc_seccomp_arch_x32; |
d58c6ad0 | 809 | } else if (strcmp(line, "[X86_64]") == 0 || |
f06c6207 | 810 | strcmp(line, "[x86_64]") == 0) { |
d58c6ad0 SH |
811 | if (native_arch != lxc_seccomp_arch_amd64) { |
812 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
813 | continue; | |
814 | } | |
9c3798eb | 815 | |
d58c6ad0 | 816 | cur_rule_arch = lxc_seccomp_arch_amd64; |
d58c6ad0 | 817 | } else if (strcmp(line, "[all]") == 0 || |
f06c6207 | 818 | strcmp(line, "[ALL]") == 0) { |
d58c6ad0 | 819 | cur_rule_arch = lxc_seccomp_arch_all; |
d58c6ad0 | 820 | } |
2b0ae718 | 821 | #ifdef SCMP_ARCH_ARM |
50798138 | 822 | else if (strcmp(line, "[arm]") == 0 || |
f06c6207 | 823 | strcmp(line, "[ARM]") == 0) { |
7635139a | 824 | if (native_arch != lxc_seccomp_arch_arm && |
7e84441e | 825 | native_arch != lxc_seccomp_arch_arm64) { |
d58c6ad0 SH |
826 | cur_rule_arch = lxc_seccomp_arch_unknown; |
827 | continue; | |
828 | } | |
9c3798eb | 829 | |
d58c6ad0 | 830 | cur_rule_arch = lxc_seccomp_arch_arm; |
d58c6ad0 | 831 | } |
b4067426 | 832 | #endif |
9d291dd2 BP |
833 | #ifdef SCMP_ARCH_AARCH64 |
834 | else if (strcmp(line, "[arm64]") == 0 || | |
f06c6207 | 835 | strcmp(line, "[ARM64]") == 0) { |
9d291dd2 BP |
836 | if (native_arch != lxc_seccomp_arch_arm64) { |
837 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
838 | continue; | |
839 | } | |
9c3798eb | 840 | |
9d291dd2 BP |
841 | cur_rule_arch = lxc_seccomp_arch_arm64; |
842 | } | |
843 | #endif | |
b4067426 BP |
844 | #ifdef SCMP_ARCH_PPC64LE |
845 | else if (strcmp(line, "[ppc64le]") == 0 || | |
f06c6207 | 846 | strcmp(line, "[PPC64LE]") == 0) { |
b4067426 BP |
847 | if (native_arch != lxc_seccomp_arch_ppc64le) { |
848 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
849 | continue; | |
850 | } | |
9c3798eb | 851 | |
b4067426 BP |
852 | cur_rule_arch = lxc_seccomp_arch_ppc64le; |
853 | } | |
854 | #endif | |
855 | #ifdef SCMP_ARCH_PPC64 | |
856 | else if (strcmp(line, "[ppc64]") == 0 || | |
f06c6207 | 857 | strcmp(line, "[PPC64]") == 0) { |
b4067426 BP |
858 | if (native_arch != lxc_seccomp_arch_ppc64) { |
859 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
860 | continue; | |
861 | } | |
9c3798eb | 862 | |
b4067426 BP |
863 | cur_rule_arch = lxc_seccomp_arch_ppc64; |
864 | } | |
865 | #endif | |
866 | #ifdef SCMP_ARCH_PPC | |
867 | else if (strcmp(line, "[ppc]") == 0 || | |
f06c6207 | 868 | strcmp(line, "[PPC]") == 0) { |
7635139a | 869 | if (native_arch != lxc_seccomp_arch_ppc && |
7e84441e | 870 | native_arch != lxc_seccomp_arch_ppc64) { |
b4067426 BP |
871 | cur_rule_arch = lxc_seccomp_arch_unknown; |
872 | continue; | |
873 | } | |
9c3798eb | 874 | |
b4067426 BP |
875 | cur_rule_arch = lxc_seccomp_arch_ppc; |
876 | } | |
2ccd9eda JC |
877 | #endif |
878 | #ifdef SCMP_ARCH_MIPS | |
879 | else if (strcmp(line, "[mips64]") == 0 || | |
f06c6207 | 880 | strcmp(line, "[MIPS64]") == 0) { |
2ccd9eda JC |
881 | if (native_arch != lxc_seccomp_arch_mips64) { |
882 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
883 | continue; | |
884 | } | |
9c3798eb | 885 | |
2ccd9eda JC |
886 | cur_rule_arch = lxc_seccomp_arch_mips64; |
887 | } else if (strcmp(line, "[mips64n32]") == 0 || | |
f06c6207 | 888 | strcmp(line, "[MIPS64N32]") == 0) { |
2ccd9eda JC |
889 | if (native_arch != lxc_seccomp_arch_mips64) { |
890 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
891 | continue; | |
892 | } | |
9c3798eb | 893 | |
2ccd9eda JC |
894 | cur_rule_arch = lxc_seccomp_arch_mips64n32; |
895 | } else if (strcmp(line, "[mips]") == 0 || | |
f06c6207 | 896 | strcmp(line, "[MIPS]") == 0) { |
2ccd9eda | 897 | if (native_arch != lxc_seccomp_arch_mips && |
7e84441e | 898 | native_arch != lxc_seccomp_arch_mips64) { |
2ccd9eda JC |
899 | cur_rule_arch = lxc_seccomp_arch_unknown; |
900 | continue; | |
901 | } | |
9c3798eb | 902 | |
2ccd9eda JC |
903 | cur_rule_arch = lxc_seccomp_arch_mips; |
904 | } else if (strcmp(line, "[mipsel64]") == 0 || | |
f06c6207 | 905 | strcmp(line, "[MIPSEL64]") == 0) { |
2ccd9eda JC |
906 | if (native_arch != lxc_seccomp_arch_mipsel64) { |
907 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
908 | continue; | |
909 | } | |
9c3798eb | 910 | |
2ccd9eda JC |
911 | cur_rule_arch = lxc_seccomp_arch_mipsel64; |
912 | } else if (strcmp(line, "[mipsel64n32]") == 0 || | |
f06c6207 | 913 | strcmp(line, "[MIPSEL64N32]") == 0) { |
2ccd9eda JC |
914 | if (native_arch != lxc_seccomp_arch_mipsel64) { |
915 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
916 | continue; | |
917 | } | |
9c3798eb | 918 | |
2ccd9eda JC |
919 | cur_rule_arch = lxc_seccomp_arch_mipsel64n32; |
920 | } else if (strcmp(line, "[mipsel]") == 0 || | |
f06c6207 | 921 | strcmp(line, "[MIPSEL]") == 0) { |
2ccd9eda | 922 | if (native_arch != lxc_seccomp_arch_mipsel && |
7e84441e | 923 | native_arch != lxc_seccomp_arch_mipsel64) { |
2ccd9eda JC |
924 | cur_rule_arch = lxc_seccomp_arch_unknown; |
925 | continue; | |
926 | } | |
9c3798eb | 927 | |
2ccd9eda JC |
928 | cur_rule_arch = lxc_seccomp_arch_mipsel; |
929 | } | |
be038e49 CB |
930 | #endif |
931 | #ifdef SCMP_ARCH_S390X | |
932 | else if (strcmp(line, "[s390x]") == 0 || | |
f06c6207 | 933 | strcmp(line, "[S390X]") == 0) { |
be038e49 CB |
934 | if (native_arch != lxc_seccomp_arch_s390x) { |
935 | cur_rule_arch = lxc_seccomp_arch_unknown; | |
936 | continue; | |
937 | } | |
9c3798eb | 938 | |
be038e49 | 939 | cur_rule_arch = lxc_seccomp_arch_s390x; |
b8bcbe9b | 940 | } |
2b0ae718 | 941 | #endif |
b8bcbe9b | 942 | else { |
50798138 | 943 | goto bad_arch; |
9c3798eb | 944 | } |
d58c6ad0 | 945 | |
50798138 SH |
946 | continue; |
947 | } | |
948 | ||
d58c6ad0 SH |
949 | /* irrelevant arch - i.e. arm on i386 */ |
950 | if (cur_rule_arch == lxc_seccomp_arch_unknown) | |
951 | continue; | |
952 | ||
3ee26d19 | 953 | memset(&rule, 0, sizeof(rule)); |
d58c6ad0 | 954 | /* read optional action which follows the syscall */ |
3ee26d19 L |
955 | ret = parse_v2_rules(line, default_rule_action, &rule); |
956 | if (ret != 0) { | |
957 | ERROR("Failed to interpret seccomp rule"); | |
50798138 SH |
958 | goto bad_rule; |
959 | } | |
d58c6ad0 | 960 | |
d7d2d2d9 | 961 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
02ca9d75 | 962 | if ((rule.action == SCMP_ACT_NOTIFY) && |
c3e3c21a | 963 | !conf->seccomp.notifier.wants_supervision) { |
c3e3c21a | 964 | conf->seccomp.notifier.wants_supervision = true; |
2e5bcac3 | 965 | TRACE("Set SECCOMP_FILTER_FLAG_NEW_LISTENER attribute"); |
cdb2a47f CB |
966 | } |
967 | #endif | |
968 | ||
3e9671a1 | 969 | if (!do_resolve_add_rule(SCMP_ARCH_NATIVE, line, |
c3e3c21a | 970 | conf->seccomp.seccomp_ctx, &rule)) |
3e9671a1 | 971 | goto bad_rule; |
9c3798eb | 972 | |
3e9671a1 CB |
973 | INFO("Added native rule for arch %d for %s action %d(%s)", |
974 | SCMP_ARCH_NATIVE, line, rule.action, | |
975 | get_action_name(rule.action)); | |
94d56054 | 976 | |
3e9671a1 CB |
977 | if (ctx.architectures[0] != SCMP_ARCH_NATIVE) { |
978 | if (!do_resolve_add_rule(ctx.architectures[0], line, | |
979 | ctx.contexts[0], &rule)) | |
d6417887 | 980 | goto bad_rule; |
9c3798eb | 981 | |
eca6736e | 982 | INFO("Added compat rule for arch %d for %s action %d(%s)", |
3e9671a1 | 983 | ctx.architectures[0], line, rule.action, |
3ee26d19 | 984 | get_action_name(rule.action)); |
3e9671a1 | 985 | } |
eca6736e | 986 | |
3e9671a1 CB |
987 | if (ctx.architectures[1] != SCMP_ARCH_NATIVE) { |
988 | if (!do_resolve_add_rule(ctx.architectures[1], line, | |
989 | ctx.contexts[1], &rule)) | |
990 | goto bad_rule; | |
9c3798eb | 991 | |
3e9671a1 CB |
992 | INFO("Added compat rule for arch %d for %s action %d(%s)", |
993 | ctx.architectures[1], line, rule.action, | |
994 | get_action_name(rule.action)); | |
995 | } | |
f1bcfc79 | 996 | |
3e9671a1 CB |
997 | if (ctx.architectures[2] != SCMP_ARCH_NATIVE) { |
998 | if (!do_resolve_add_rule(ctx.architectures[2], line, | |
999 | ctx.contexts[2], &rule)) | |
1000 | goto bad_rule; | |
f1bcfc79 | 1001 | |
3e9671a1 CB |
1002 | INFO("Added native rule for arch %d for %s action %d(%s)", |
1003 | ctx.architectures[2], line, rule.action, | |
1004 | get_action_name(rule.action)); | |
50798138 SH |
1005 | } |
1006 | } | |
d58c6ad0 | 1007 | |
d648e178 | 1008 | INFO("Merging compat seccomp contexts into main context"); |
eca6736e CB |
1009 | if (ctx.contexts[0]) { |
1010 | if (ctx.needs_merge[0]) { | |
c3e3c21a | 1011 | ret = seccomp_merge(conf->seccomp.seccomp_ctx, ctx.contexts[0]); |
b5ed021b | 1012 | if (ret < 0) { |
3e9671a1 CB |
1013 | ERROR("Failed to merge first compat seccomp " |
1014 | "context into main context"); | |
b5ed021b CB |
1015 | goto bad; |
1016 | } | |
9c3798eb | 1017 | |
b5ed021b | 1018 | TRACE("Merged first compat seccomp context into main context"); |
d648e178 | 1019 | } else { |
eca6736e CB |
1020 | seccomp_release(ctx.contexts[0]); |
1021 | ctx.contexts[0] = NULL; | |
b5ed021b | 1022 | } |
d648e178 | 1023 | } |
b5ed021b | 1024 | |
eca6736e CB |
1025 | if (ctx.contexts[1]) { |
1026 | if (ctx.needs_merge[1]) { | |
c3e3c21a | 1027 | ret = seccomp_merge(conf->seccomp.seccomp_ctx, ctx.contexts[1]); |
b5ed021b | 1028 | if (ret < 0) { |
3e9671a1 CB |
1029 | ERROR("Failed to merge first compat seccomp " |
1030 | "context into main context"); | |
b5ed021b CB |
1031 | goto bad; |
1032 | } | |
9c3798eb | 1033 | |
b5ed021b | 1034 | TRACE("Merged second compat seccomp context into main context"); |
d648e178 | 1035 | } else { |
eca6736e CB |
1036 | seccomp_release(ctx.contexts[1]); |
1037 | ctx.contexts[1] = NULL; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | if (ctx.contexts[2]) { | |
1042 | if (ctx.needs_merge[2]) { | |
c3e3c21a | 1043 | ret = seccomp_merge(conf->seccomp.seccomp_ctx, ctx.contexts[2]); |
eca6736e | 1044 | if (ret < 0) { |
3e9671a1 CB |
1045 | ERROR("Failed to merge third compat seccomp " |
1046 | "context into main context"); | |
eca6736e CB |
1047 | goto bad; |
1048 | } | |
9c3798eb | 1049 | |
eca6736e CB |
1050 | TRACE("Merged third compat seccomp context into main context"); |
1051 | } else { | |
1052 | seccomp_release(ctx.contexts[2]); | |
1053 | ctx.contexts[2] = NULL; | |
50798138 SH |
1054 | } |
1055 | } | |
6166fa6d | 1056 | |
9dbd8ff3 | 1057 | free(line); |
50798138 SH |
1058 | return 0; |
1059 | ||
1060 | bad_arch: | |
9c3798eb CB |
1061 | ERROR("Unsupported architecture \"%s\"", line); |
1062 | ||
50798138 | 1063 | bad_rule: |
d58c6ad0 | 1064 | bad: |
eca6736e CB |
1065 | if (ctx.contexts[0]) |
1066 | seccomp_release(ctx.contexts[0]); | |
9c3798eb | 1067 | |
eca6736e CB |
1068 | if (ctx.contexts[1]) |
1069 | seccomp_release(ctx.contexts[1]); | |
9c3798eb | 1070 | |
eca6736e CB |
1071 | if (ctx.contexts[2]) |
1072 | seccomp_release(ctx.contexts[2]); | |
1073 | ||
9dbd8ff3 | 1074 | free(line); |
9c3798eb | 1075 | |
50798138 | 1076 | return -1; |
d58c6ad0 SH |
1077 | } |
1078 | #else /* HAVE_DECL_SECCOMP_SYSCALL_RESOLVE_NAME_ARCH */ | |
1079 | static int parse_config_v2(FILE *f, char *line, struct lxc_conf *conf) | |
1080 | { | |
50798138 | 1081 | return -1; |
50798138 | 1082 | } |
d58c6ad0 | 1083 | #endif /* HAVE_DECL_SECCOMP_SYSCALL_RESOLVE_NAME_ARCH */ |
50798138 | 1084 | |
8f2c3a70 SH |
1085 | /* |
1086 | * The first line of the config file has a policy language version | |
1087 | * the second line has some directives | |
1088 | * then comes policy subject to the directives | |
998cd2f4 | 1089 | * right now version must be '1' or '2' |
1090 | * the directives must include 'whitelist'(version == 1 or 2) or 'blacklist' | |
1091 | * (version == 2) and can include 'debug' (though debug is not yet supported). | |
8f2c3a70 SH |
1092 | */ |
1093 | static int parse_config(FILE *f, struct lxc_conf *conf) | |
1094 | { | |
9dbd8ff3 WB |
1095 | char *line = NULL; |
1096 | size_t line_bufsz = 0; | |
8f2c3a70 SH |
1097 | int ret, version; |
1098 | ||
1099 | ret = fscanf(f, "%d\n", &version); | |
50798138 | 1100 | if (ret != 1 || (version != 1 && version != 2)) { |
3ee26d19 | 1101 | ERROR("Invalid version"); |
8f2c3a70 SH |
1102 | return -1; |
1103 | } | |
6ca8172d | 1104 | |
9dbd8ff3 | 1105 | if (getline(&line, &line_bufsz, f) == -1) { |
3ee26d19 | 1106 | ERROR("Invalid config file"); |
9dbd8ff3 | 1107 | goto bad_line; |
8f2c3a70 | 1108 | } |
6ca8172d | 1109 | |
50798138 | 1110 | if (version == 1 && !strstr(line, "whitelist")) { |
3ee26d19 | 1111 | ERROR("Only whitelist policy is supported"); |
9dbd8ff3 | 1112 | goto bad_line; |
8f2c3a70 | 1113 | } |
50798138 | 1114 | |
8f2c3a70 | 1115 | if (strstr(line, "debug")) { |
3ee26d19 | 1116 | ERROR("Debug not yet implemented"); |
9dbd8ff3 | 1117 | goto bad_line; |
8f2c3a70 | 1118 | } |
50798138 SH |
1119 | |
1120 | if (version == 1) | |
9dbd8ff3 | 1121 | return parse_config_v1(f, line, &line_bufsz, conf); |
6ca8172d | 1122 | |
9dbd8ff3 WB |
1123 | return parse_config_v2(f, line, &line_bufsz, conf); |
1124 | ||
1125 | bad_line: | |
1126 | free(line); | |
1127 | return -1; | |
8f2c3a70 SH |
1128 | } |
1129 | ||
cd75548b SH |
1130 | /* |
1131 | * use_seccomp: return true if we should try and apply a seccomp policy | |
1132 | * if defined for the container. | |
1133 | * This will return false if | |
1134 | * 1. seccomp is not enabled in the kernel | |
1135 | * 2. a seccomp policy is already enabled for this task | |
1136 | */ | |
50d86993 | 1137 | static bool use_seccomp(const struct lxc_conf *conf) |
d58c6ad0 | 1138 | { |
d58c6ad0 | 1139 | int ret, v; |
6ca8172d CB |
1140 | FILE *f; |
1141 | size_t line_bufsz = 0; | |
1142 | char *line = NULL; | |
1143 | bool already_enabled = false, found = false; | |
d58c6ad0 | 1144 | |
c3e3c21a | 1145 | if (conf->seccomp.allow_nesting > 0) |
50d86993 CB |
1146 | return true; |
1147 | ||
6ca8172d | 1148 | f = fopen("/proc/self/status", "r"); |
d58c6ad0 | 1149 | if (!f) |
cd75548b | 1150 | return true; |
d58c6ad0 | 1151 | |
6ca8172d | 1152 | while (getline(&line, &line_bufsz, f) != -1) { |
d58c6ad0 | 1153 | if (strncmp(line, "Seccomp:", 8) == 0) { |
cd75548b | 1154 | found = true; |
6ca8172d | 1155 | |
f06c6207 | 1156 | ret = sscanf(line + 8, "%d", &v); |
cd75548b SH |
1157 | if (ret == 1 && v != 0) |
1158 | already_enabled = true; | |
6ca8172d | 1159 | |
cd75548b | 1160 | break; |
d58c6ad0 SH |
1161 | } |
1162 | } | |
6ca8172d | 1163 | free(line); |
d58c6ad0 | 1164 | fclose(f); |
6ca8172d CB |
1165 | |
1166 | if (!found) { | |
3ee26d19 | 1167 | INFO("Seccomp is not enabled in the kernel"); |
cd75548b SH |
1168 | return false; |
1169 | } | |
6ca8172d CB |
1170 | |
1171 | if (already_enabled) { | |
3ee26d19 | 1172 | INFO("Already seccomp-confined, not loading new policy"); |
cd75548b SH |
1173 | return false; |
1174 | } | |
6ca8172d | 1175 | |
cd75548b | 1176 | return true; |
d58c6ad0 SH |
1177 | } |
1178 | ||
8f2c3a70 SH |
1179 | int lxc_read_seccomp_config(struct lxc_conf *conf) |
1180 | { | |
cf6624c1 | 1181 | int ret; |
8f2c3a70 | 1182 | FILE *f; |
8f2c3a70 | 1183 | |
c3e3c21a | 1184 | if (!conf->seccomp.seccomp) |
769872f9 SH |
1185 | return 0; |
1186 | ||
50d86993 | 1187 | if (!use_seccomp(conf)) |
d58c6ad0 | 1188 | return 0; |
47f6d547 | 1189 | |
769872f9 SH |
1190 | #if HAVE_SCMP_FILTER_CTX |
1191 | /* XXX for debug, pass in SCMP_ACT_TRAP */ | |
c3e3c21a CB |
1192 | conf->seccomp.seccomp_ctx = seccomp_init(SCMP_ACT_KILL); |
1193 | ret = !conf->seccomp.seccomp_ctx; | |
769872f9 | 1194 | #else |
50798138 | 1195 | ret = seccomp_init(SCMP_ACT_KILL) < 0; |
769872f9 SH |
1196 | #endif |
1197 | if (ret) { | |
3ee26d19 | 1198 | ERROR("Failed initializing seccomp"); |
8f2c3a70 SH |
1199 | return -1; |
1200 | } | |
8f2c3a70 | 1201 | |
47f6d547 | 1202 | /* turn off no-new-privs. We don't want it in lxc, and it breaks |
f06c6207 | 1203 | * with apparmor */ |
769872f9 | 1204 | #if HAVE_SCMP_FILTER_CTX |
c3e3c21a | 1205 | ret = seccomp_attr_set(conf->seccomp.seccomp_ctx, SCMP_FLTATR_CTL_NNP, 0); |
727c3073 | 1206 | #else |
cf6624c1 | 1207 | ret = seccomp_attr_set(SCMP_FLTATR_CTL_NNP, 0); |
769872f9 | 1208 | #endif |
cf6624c1 | 1209 | if (ret < 0) { |
6d1400b5 | 1210 | errno = -ret; |
1211 | SYSERROR("Failed to turn off no-new-privs"); | |
8f2c3a70 SH |
1212 | return -1; |
1213 | } | |
a24c5678 | 1214 | |
127c5293 | 1215 | #ifdef SCMP_FLTATR_ATL_TSKIP |
c3e3c21a | 1216 | ret = seccomp_attr_set(conf->seccomp.seccomp_ctx, SCMP_FLTATR_ATL_TSKIP, 1); |
a24c5678 | 1217 | if (ret < 0) { |
1218 | errno = -ret; | |
1219 | SYSWARN("Failed to turn on seccomp nop-skip, continuing"); | |
1220 | } | |
127c5293 | 1221 | #endif |
8f2c3a70 | 1222 | |
c3e3c21a | 1223 | f = fopen(conf->seccomp.seccomp, "r"); |
8f2c3a70 | 1224 | if (!f) { |
c3e3c21a | 1225 | SYSERROR("Failed to open seccomp policy file %s", conf->seccomp.seccomp); |
8f2c3a70 SH |
1226 | return -1; |
1227 | } | |
47f6d547 | 1228 | |
8f2c3a70 SH |
1229 | ret = parse_config(f, conf); |
1230 | fclose(f); | |
47f6d547 | 1231 | |
8f2c3a70 SH |
1232 | return ret; |
1233 | } | |
1234 | ||
1235 | int lxc_seccomp_load(struct lxc_conf *conf) | |
1236 | { | |
1237 | int ret; | |
47f6d547 | 1238 | |
c3e3c21a | 1239 | if (!conf->seccomp.seccomp) |
8f2c3a70 | 1240 | return 0; |
47f6d547 | 1241 | |
50d86993 | 1242 | if (!use_seccomp(conf)) |
d58c6ad0 | 1243 | return 0; |
47f6d547 | 1244 | |
769872f9 | 1245 | #if HAVE_SCMP_FILTER_CTX |
c3e3c21a | 1246 | ret = seccomp_load(conf->seccomp.seccomp_ctx); |
47f6d547 CB |
1247 | #else |
1248 | ret = seccomp_load(); | |
769872f9 | 1249 | #endif |
8f2c3a70 | 1250 | if (ret < 0) { |
6d1400b5 | 1251 | errno = -ret; |
1252 | SYSERROR("Error loading the seccomp policy"); | |
8f2c3a70 SH |
1253 | return -1; |
1254 | } | |
5107af32 | 1255 | |
1256 | /* After load seccomp filter into the kernel successfully, export the current seccomp | |
1257 | * filter to log file */ | |
1258 | #if HAVE_SCMP_FILTER_CTX | |
47f6d547 CB |
1259 | if ((lxc_log_get_level() <= LXC_LOG_LEVEL_TRACE || |
1260 | conf->loglevel <= LXC_LOG_LEVEL_TRACE) && | |
5107af32 | 1261 | lxc_log_fd >= 0) { |
c3e3c21a | 1262 | ret = seccomp_export_pfc(conf->seccomp.seccomp_ctx, lxc_log_fd); |
5107af32 | 1263 | /* Just give an warning when export error */ |
a24c5678 | 1264 | if (ret < 0) { |
1265 | errno = -ret; | |
1266 | SYSWARN("Failed to export seccomp filter to log file"); | |
1267 | } | |
5107af32 | 1268 | } |
1269 | #endif | |
47f6d547 | 1270 | |
d7d2d2d9 | 1271 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
c3e3c21a | 1272 | if (conf->seccomp.notifier.wants_supervision) { |
da9c8317 | 1273 | ret = seccomp_notify_fd(conf->seccomp.seccomp_ctx); |
cdb2a47f CB |
1274 | if (ret < 0) { |
1275 | errno = -ret; | |
1276 | return -1; | |
1277 | } | |
1278 | ||
c3e3c21a | 1279 | conf->seccomp.notifier.notify_fd = ret; |
cdb2a47f CB |
1280 | TRACE("Retrieved new seccomp listener fd %d", ret); |
1281 | } | |
1282 | #endif | |
1283 | ||
8f2c3a70 SH |
1284 | return 0; |
1285 | } | |
769872f9 | 1286 | |
c3e3c21a | 1287 | void lxc_seccomp_free(struct lxc_seccomp *seccomp) |
f06c6207 | 1288 | { |
c3e3c21a | 1289 | free_disarm(seccomp->seccomp); |
47f6d547 | 1290 | |
769872f9 | 1291 | #if HAVE_SCMP_FILTER_CTX |
c3e3c21a CB |
1292 | if (seccomp->seccomp_ctx) { |
1293 | seccomp_release(seccomp->seccomp_ctx); | |
1294 | seccomp->seccomp_ctx = NULL; | |
769872f9 SH |
1295 | } |
1296 | #endif | |
cdb2a47f | 1297 | |
d7d2d2d9 | 1298 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
c3e3c21a CB |
1299 | close_prot_errno_disarm(seccomp->notifier.notify_fd); |
1300 | close_prot_errno_disarm(seccomp->notifier.proxy_fd); | |
99656206 | 1301 | seccomp_notify_free(seccomp->notifier.req_buf, seccomp->notifier.rsp_buf); |
c3e3c21a CB |
1302 | seccomp->notifier.req_buf = NULL; |
1303 | seccomp->notifier.rsp_buf = NULL; | |
cdb2a47f CB |
1304 | #endif |
1305 | } | |
1306 | ||
d7d2d2d9 | 1307 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
e35b7bf8 CB |
1308 | static int seccomp_notify_reconnect(struct lxc_handler *handler) |
1309 | { | |
1310 | __do_close_prot_errno int notify_fd = -EBADF; | |
1311 | ||
c3e3c21a | 1312 | close_prot_errno_disarm(handler->conf->seccomp.notifier.proxy_fd); |
e35b7bf8 | 1313 | |
c3e3c21a | 1314 | notify_fd = lxc_unix_connect(&handler->conf->seccomp.notifier.proxy_addr); |
e35b7bf8 CB |
1315 | if (notify_fd < 0) { |
1316 | SYSERROR("Failed to reconnect to seccomp proxy"); | |
1317 | return -1; | |
1318 | } | |
1319 | ||
1320 | /* 30 second timeout */ | |
1321 | if (lxc_socket_set_timeout(notify_fd, 30, 30)) { | |
1322 | SYSERROR("Failed to set socket timeout"); | |
1323 | return -1; | |
1324 | } | |
c3e3c21a | 1325 | handler->conf->seccomp.notifier.proxy_fd = move_fd(notify_fd); |
e35b7bf8 CB |
1326 | return 0; |
1327 | } | |
1328 | #endif | |
1329 | ||
d7d2d2d9 | 1330 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
e35b7bf8 CB |
1331 | static int seccomp_notify_default_answer(int fd, struct seccomp_notif *req, |
1332 | struct seccomp_notif_resp *resp, | |
1333 | struct lxc_handler *handler) | |
1334 | { | |
1335 | resp->id = req->id; | |
1336 | resp->error = -ENOSYS; | |
1337 | ||
3c216fe2 | 1338 | if (seccomp_notify_respond(fd, resp)) |
e35b7bf8 CB |
1339 | SYSERROR("Failed to send default message to seccomp"); |
1340 | ||
1341 | return seccomp_notify_reconnect(handler); | |
1342 | } | |
1343 | #endif | |
1344 | ||
cdb2a47f CB |
1345 | int seccomp_notify_handler(int fd, uint32_t events, void *data, |
1346 | struct lxc_epoll_descr *descr) | |
1347 | { | |
1348 | ||
d7d2d2d9 | 1349 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
5ed06d3a | 1350 | __do_close_prot_errno int fd_mem = -EBADF; |
e35b7bf8 CB |
1351 | int reconnect_count, ret; |
1352 | ssize_t bytes; | |
4a094eec WB |
1353 | struct iovec iov[4]; |
1354 | size_t iov_len, msg_base_size, msg_full_size; | |
18847d37 CB |
1355 | char mem_path[6 /* /proc/ */ |
1356 | + INTTYPE_TO_STRLEN(int64_t) | |
1357 | + 3 /* mem */ | |
1358 | + 1 /* \0 */]; | |
cdb2a47f CB |
1359 | struct lxc_handler *hdlr = data; |
1360 | struct lxc_conf *conf = hdlr->conf; | |
c3e3c21a CB |
1361 | struct seccomp_notif *req = conf->seccomp.notifier.req_buf; |
1362 | struct seccomp_notif_resp *resp = conf->seccomp.notifier.rsp_buf; | |
1363 | int listener_proxy_fd = conf->seccomp.notifier.proxy_fd; | |
37046066 | 1364 | struct seccomp_notify_proxy_msg msg = {0}; |
4a094eec WB |
1365 | char *cookie = conf->seccomp.notifier.cookie; |
1366 | uint64_t req_id; | |
cdb2a47f | 1367 | |
e35b7bf8 CB |
1368 | if (listener_proxy_fd < 0) { |
1369 | ERROR("No seccomp proxy registered"); | |
cdb2a47f | 1370 | return minus_one_set_errno(EINVAL); |
e35b7bf8 | 1371 | } |
cdb2a47f | 1372 | |
e3998402 | 1373 | ret = seccomp_notify_receive(fd, req); |
e35b7bf8 CB |
1374 | if (ret) { |
1375 | SYSERROR("Failed to read seccomp notification"); | |
1376 | goto out; | |
1377 | } | |
cdb2a47f | 1378 | |
4a094eec WB |
1379 | /* remember the ID in case we receive garbage from the proxy */ |
1380 | resp->id = req_id = req->id; | |
1381 | ||
5ed06d3a CB |
1382 | snprintf(mem_path, sizeof(mem_path), "/proc/%d/mem", req->pid); |
1383 | fd_mem = open(mem_path, O_RDONLY | O_CLOEXEC); | |
1384 | if (fd_mem < 0) { | |
1385 | (void)seccomp_notify_default_answer(fd, req, resp, hdlr); | |
1386 | SYSERROR("Failed to open process memory for seccomp notify request"); | |
1387 | goto out; | |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * Make sure that the fd for /proc/<pid>/mem we just opened still | |
1392 | * refers to the correct process's memory. | |
1393 | */ | |
72b101ae | 1394 | ret = seccomp_notify_id_valid(fd, req->id); |
5ed06d3a CB |
1395 | if (ret < 0) { |
1396 | (void)seccomp_notify_default_answer(fd, req, resp, hdlr); | |
1397 | SYSERROR("Invalid seccomp notify request id"); | |
1398 | goto out; | |
1399 | } | |
1400 | ||
cdb2a47f CB |
1401 | msg.monitor_pid = hdlr->monitor_pid; |
1402 | msg.init_pid = hdlr->pid; | |
4a094eec WB |
1403 | memcpy(&msg.sizes, &conf->seccomp.notifier.sizes, sizeof(msg.sizes)); |
1404 | ||
1405 | msg_base_size = 0; | |
1406 | iov[0].iov_base = &msg; | |
1407 | msg_base_size += (iov[0].iov_len = sizeof(msg)); | |
1408 | iov[1].iov_base = req; | |
1409 | msg_base_size += (iov[1].iov_len = msg.sizes.seccomp_notif); | |
1410 | iov[2].iov_base = resp; | |
1411 | msg_base_size += (iov[2].iov_len = msg.sizes.seccomp_notif_resp); | |
1412 | msg_full_size = msg_base_size; | |
1413 | ||
1414 | if (cookie) { | |
1415 | size_t len = strlen(cookie); | |
1416 | ||
1417 | msg.cookie_len = (uint64_t)len; | |
1418 | ||
1419 | iov[3].iov_base = cookie; | |
1420 | msg_full_size += (iov[3].iov_len = len); | |
1421 | ||
1422 | iov_len = 4; | |
1423 | } else { | |
1424 | iov_len = 3; | |
1425 | } | |
cdb2a47f | 1426 | |
e35b7bf8 CB |
1427 | reconnect_count = 0; |
1428 | do { | |
4a094eec WB |
1429 | bytes = lxc_abstract_unix_send_fds_iov(listener_proxy_fd, |
1430 | &fd_mem, 1, iov, | |
1431 | iov_len); | |
1432 | if (bytes != (ssize_t)msg_full_size) { | |
e35b7bf8 CB |
1433 | SYSERROR("Failed to forward message to seccomp proxy"); |
1434 | if (seccomp_notify_default_answer(fd, req, resp, hdlr)) | |
1435 | goto out; | |
1436 | } | |
1437 | } while (reconnect_count++); | |
1438 | ||
5ed06d3a CB |
1439 | close_prot_errno_disarm(fd_mem); |
1440 | ||
f910c9e5 WB |
1441 | if (msg.__reserved != 0) { |
1442 | ERROR("Proxy filled reserved data in response"); | |
1443 | seccomp_notify_default_answer(fd, req, resp, hdlr); | |
1444 | goto out; | |
1445 | } | |
1446 | ||
4a094eec WB |
1447 | if (resp->id != req_id) { |
1448 | resp->id = req_id; | |
1449 | ERROR("Proxy returned response with illegal id"); | |
1450 | (void)seccomp_notify_default_answer(fd, req, resp, hdlr); | |
1451 | goto out; | |
1452 | } | |
1453 | ||
e35b7bf8 CB |
1454 | reconnect_count = 0; |
1455 | do { | |
4a094eec WB |
1456 | bytes = lxc_recvmsg_nointr_iov(listener_proxy_fd, iov,iov_len, |
1457 | 0); | |
1458 | if (bytes != (ssize_t)msg_base_size) { | |
e35b7bf8 CB |
1459 | SYSERROR("Failed to receive message from seccomp proxy"); |
1460 | if (seccomp_notify_default_answer(fd, req, resp, hdlr)) | |
1461 | goto out; | |
1462 | } | |
1463 | } while (reconnect_count++); | |
cdb2a47f | 1464 | |
3c216fe2 | 1465 | ret = seccomp_notify_respond(fd, resp); |
cdb2a47f | 1466 | if (ret) |
e35b7bf8 | 1467 | SYSERROR("Failed to send seccomp notification"); |
cdb2a47f | 1468 | |
e35b7bf8 | 1469 | out: |
cdb2a47f CB |
1470 | return 0; |
1471 | #else | |
1472 | return -ENOSYS; | |
1473 | #endif | |
769872f9 | 1474 | } |
c3e3c21a CB |
1475 | |
1476 | void seccomp_conf_init(struct lxc_conf *conf) | |
1477 | { | |
1478 | conf->seccomp.seccomp = NULL; | |
1479 | #if HAVE_SCMP_FILTER_CTX | |
1480 | conf->seccomp.allow_nesting = 0; | |
1481 | memset(&conf->seccomp.seccomp_ctx, 0, sizeof(conf->seccomp.seccomp_ctx)); | |
1482 | #endif /* HAVE_SCMP_FILTER_CTX */ | |
d7d2d2d9 | 1483 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
c3e3c21a CB |
1484 | conf->seccomp.notifier.wants_supervision = false; |
1485 | conf->seccomp.notifier.notify_fd = -EBADF; | |
1486 | conf->seccomp.notifier.proxy_fd = -EBADF; | |
1487 | memset(&conf->seccomp.notifier.proxy_addr, 0, | |
1488 | sizeof(conf->seccomp.notifier.proxy_addr)); | |
1489 | conf->seccomp.notifier.req_buf = NULL; | |
1490 | conf->seccomp.notifier.rsp_buf = NULL; | |
1491 | #endif | |
1492 | } | |
1493 | ||
2ac0f627 CB |
1494 | int lxc_seccomp_setup_proxy(struct lxc_seccomp *seccomp, |
1495 | struct lxc_epoll_descr *descr, | |
1496 | struct lxc_handler *handler) | |
c3e3c21a | 1497 | { |
d7d2d2d9 | 1498 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
c3e3c21a CB |
1499 | if (seccomp->notifier.wants_supervision && |
1500 | seccomp->notifier.proxy_addr.sun_path[1] != '\0') { | |
1501 | __do_close_prot_errno int notify_fd = -EBADF; | |
1502 | int ret; | |
1503 | ||
1504 | notify_fd = lxc_unix_connect(&seccomp->notifier.proxy_addr); | |
2ac0f627 CB |
1505 | if (notify_fd < 0) { |
1506 | SYSERROR("Failed to connect to seccomp proxy"); | |
c3e3c21a | 1507 | return -1; |
2ac0f627 | 1508 | } |
c3e3c21a CB |
1509 | |
1510 | /* 30 second timeout */ | |
1511 | ret = lxc_socket_set_timeout(notify_fd, 30, 30); | |
2ac0f627 CB |
1512 | if (ret) { |
1513 | SYSERROR("Failed to set timeouts for seccomp proxy"); | |
c3e3c21a | 1514 | return -1; |
2ac0f627 CB |
1515 | } |
1516 | ||
4a094eec WB |
1517 | ret = __seccomp(SECCOMP_GET_NOTIF_SIZES, 0, |
1518 | &seccomp->notifier.sizes); | |
1519 | if (ret) { | |
1520 | SYSERROR("Failed to query seccomp notify struct sizes"); | |
1521 | return -1; | |
1522 | } | |
1523 | ||
1f51fc70 | 1524 | ret = seccomp_notify_alloc(&seccomp->notifier.req_buf, |
2ac0f627 CB |
1525 | &seccomp->notifier.rsp_buf); |
1526 | if (ret) { | |
1527 | ERROR("Failed to allocate seccomp notify request and response buffers"); | |
1528 | errno = ret; | |
1529 | return -1; | |
1530 | } | |
c3e3c21a CB |
1531 | |
1532 | ret = lxc_mainloop_add_handler(descr, | |
1533 | seccomp->notifier.notify_fd, | |
1534 | seccomp_notify_handler, handler); | |
1535 | if (ret < 0) { | |
1536 | ERROR("Failed to add seccomp notify handler for %d to mainloop", | |
2ac0f627 | 1537 | notify_fd); |
c3e3c21a CB |
1538 | return -1; |
1539 | } | |
1540 | ||
1541 | seccomp->notifier.proxy_fd = move_fd(notify_fd); | |
1542 | } | |
1543 | #endif | |
1544 | return 0; | |
1545 | } | |
1546 | ||
1547 | int lxc_seccomp_send_notifier_fd(struct lxc_seccomp *seccomp, int socket_fd) | |
1548 | { | |
d7d2d2d9 | 1549 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
c3e3c21a CB |
1550 | if (seccomp->notifier.wants_supervision) { |
1551 | if (lxc_abstract_unix_send_fds(socket_fd, | |
1552 | &seccomp->notifier.notify_fd, 1, | |
1553 | NULL, 0) < 0) | |
1554 | return -1; | |
1555 | close_prot_errno_disarm(seccomp->notifier.notify_fd); | |
1556 | } | |
1557 | #endif | |
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | int lxc_seccomp_recv_notifier_fd(struct lxc_seccomp *seccomp, int socket_fd) | |
1562 | { | |
d7d2d2d9 | 1563 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
c3e3c21a CB |
1564 | if (seccomp->notifier.wants_supervision) { |
1565 | int ret; | |
1566 | ||
1567 | ret = lxc_abstract_unix_recv_fds(socket_fd, | |
1568 | &seccomp->notifier.notify_fd, | |
1569 | 1, NULL, 0); | |
1570 | if (ret < 0) | |
1571 | return -1; | |
c3e3c21a CB |
1572 | } |
1573 | #endif | |
1574 | return 0; | |
1575 | } | |
1576 | ||
1577 | int lxc_seccomp_add_notifier(const char *name, const char *lxcpath, | |
1578 | struct lxc_seccomp *seccomp) | |
1579 | { | |
1580 | ||
d7d2d2d9 | 1581 | #if HAVE_DECL_SECCOMP_NOTIFY_FD |
2ac0f627 | 1582 | if (seccomp->notifier.wants_supervision) { |
c3e3c21a CB |
1583 | int ret; |
1584 | ||
1585 | ret = lxc_cmd_seccomp_notify_add_listener(name, lxcpath, | |
2ac0f627 | 1586 | seccomp->notifier.notify_fd, |
c3e3c21a CB |
1587 | -1, 0); |
1588 | close_prot_errno_disarm(seccomp->notifier.notify_fd); | |
1589 | if (ret < 0) | |
1590 | return -1; | |
1591 | } | |
1592 | #endif | |
1593 | return 0; | |
1594 | } |