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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
57183d11 | 2 | |
a8fbdf54 | 3 | #include <errno.h> |
3c27973b | 4 | #include <fcntl.h> |
469830d1 | 5 | #include <linux/seccomp.h> |
57183d11 | 6 | #include <seccomp.h> |
a8fbdf54 | 7 | #include <stddef.h> |
469830d1 | 8 | #include <sys/mman.h> |
d347d902 | 9 | #include <sys/prctl.h> |
469830d1 | 10 | #include <sys/shm.h> |
3c27973b | 11 | #include <sys/stat.h> |
57183d11 | 12 | |
469830d1 | 13 | #include "af-list.h" |
add00535 | 14 | #include "alloc-util.h" |
d8b4d14d | 15 | #include "errno-list.h" |
a8fbdf54 | 16 | #include "macro.h" |
add00535 | 17 | #include "nsflags.h" |
d8b4d14d | 18 | #include "nulstr-util.h" |
78e864e5 | 19 | #include "process-util.h" |
cf0fbc49 | 20 | #include "seccomp-util.h" |
b16bd535 | 21 | #include "set.h" |
07630cea | 22 | #include "string-util.h" |
b16bd535 | 23 | #include "strv.h" |
469830d1 LP |
24 | |
25 | const uint32_t seccomp_local_archs[] = { | |
26 | ||
6b000af4 | 27 | /* Note: always list the native arch we are compiled as last, so that users can deny-list seccomp(), but our own calls to it still succeed */ |
f2d9751c LP |
28 | |
29 | #if defined(__x86_64__) && defined(__ILP32__) | |
469830d1 LP |
30 | SCMP_ARCH_X86, |
31 | SCMP_ARCH_X86_64, | |
f2d9751c LP |
32 | SCMP_ARCH_X32, /* native */ |
33 | #elif defined(__x86_64__) && !defined(__ILP32__) | |
34 | SCMP_ARCH_X86, | |
469830d1 | 35 | SCMP_ARCH_X32, |
f2d9751c LP |
36 | SCMP_ARCH_X86_64, /* native */ |
37 | #elif defined(__i386__) | |
38 | SCMP_ARCH_X86, | |
39 | #elif defined(__aarch64__) | |
469830d1 | 40 | SCMP_ARCH_ARM, |
f2d9751c LP |
41 | SCMP_ARCH_AARCH64, /* native */ |
42 | #elif defined(__arm__) | |
43 | SCMP_ARCH_ARM, | |
44 | #elif defined(__mips__) && __BYTE_ORDER == __BIG_ENDIAN && _MIPS_SIM == _MIPS_SIM_ABI32 | |
45 | SCMP_ARCH_MIPSEL, | |
46 | SCMP_ARCH_MIPS, /* native */ | |
47 | #elif defined(__mips__) && __BYTE_ORDER == __LITTLE_ENDIAN && _MIPS_SIM == _MIPS_SIM_ABI32 | |
469830d1 | 48 | SCMP_ARCH_MIPS, |
f2d9751c LP |
49 | SCMP_ARCH_MIPSEL, /* native */ |
50 | #elif defined(__mips__) && __BYTE_ORDER == __BIG_ENDIAN && _MIPS_SIM == _MIPS_SIM_ABI64 | |
51 | SCMP_ARCH_MIPSEL, | |
52 | SCMP_ARCH_MIPS, | |
53 | SCMP_ARCH_MIPSEL64N32, | |
469830d1 | 54 | SCMP_ARCH_MIPS64N32, |
f2d9751c LP |
55 | SCMP_ARCH_MIPSEL64, |
56 | SCMP_ARCH_MIPS64, /* native */ | |
57 | #elif defined(__mips__) && __BYTE_ORDER == __LITTLE_ENDIAN && _MIPS_SIM == _MIPS_SIM_ABI64 | |
58 | SCMP_ARCH_MIPS, | |
469830d1 | 59 | SCMP_ARCH_MIPSEL, |
f2d9751c LP |
60 | SCMP_ARCH_MIPS64N32, |
61 | SCMP_ARCH_MIPSEL64N32, | |
62 | SCMP_ARCH_MIPS64, | |
63 | SCMP_ARCH_MIPSEL64, /* native */ | |
64 | #elif defined(__mips__) && __BYTE_ORDER == __BIG_ENDIAN && _MIPS_SIM == _MIPS_SIM_NABI32 | |
65 | SCMP_ARCH_MIPSEL, | |
66 | SCMP_ARCH_MIPS, | |
469830d1 | 67 | SCMP_ARCH_MIPSEL64, |
f2d9751c | 68 | SCMP_ARCH_MIPS64, |
469830d1 | 69 | SCMP_ARCH_MIPSEL64N32, |
f2d9751c LP |
70 | SCMP_ARCH_MIPS64N32, /* native */ |
71 | #elif defined(__mips__) && __BYTE_ORDER == __LITTLE_ENDIAN && _MIPS_SIM == _MIPS_SIM_NABI32 | |
72 | SCMP_ARCH_MIPS, | |
73 | SCMP_ARCH_MIPSEL, | |
74 | SCMP_ARCH_MIPS64, | |
75 | SCMP_ARCH_MIPSEL64, | |
76 | SCMP_ARCH_MIPS64N32, | |
77 | SCMP_ARCH_MIPSEL64N32, /* native */ | |
78 | #elif defined(__powerpc64__) && __BYTE_ORDER == __BIG_ENDIAN | |
469830d1 | 79 | SCMP_ARCH_PPC, |
469830d1 | 80 | SCMP_ARCH_PPC64LE, |
f2d9751c LP |
81 | SCMP_ARCH_PPC64, /* native */ |
82 | #elif defined(__powerpc64__) && __BYTE_ORDER == __LITTLE_ENDIAN | |
83 | SCMP_ARCH_PPC, | |
84 | SCMP_ARCH_PPC64, | |
85 | SCMP_ARCH_PPC64LE, /* native */ | |
86 | #elif defined(__powerpc__) | |
87 | SCMP_ARCH_PPC, | |
88 | #elif defined(__s390x__) | |
89 | SCMP_ARCH_S390, | |
90 | SCMP_ARCH_S390X, /* native */ | |
91 | #elif defined(__s390__) | |
469830d1 | 92 | SCMP_ARCH_S390, |
469830d1 LP |
93 | #endif |
94 | (uint32_t) -1 | |
95 | }; | |
57183d11 LP |
96 | |
97 | const char* seccomp_arch_to_string(uint32_t c) { | |
aa34055f ZJS |
98 | /* Maintain order used in <seccomp.h>. |
99 | * | |
100 | * Names used here should be the same as those used for ConditionArchitecture=, | |
101 | * except for "subarchitectures" like x32. */ | |
57183d11 | 102 | |
aa34055f ZJS |
103 | switch(c) { |
104 | case SCMP_ARCH_NATIVE: | |
57183d11 | 105 | return "native"; |
aa34055f | 106 | case SCMP_ARCH_X86: |
57183d11 | 107 | return "x86"; |
aa34055f | 108 | case SCMP_ARCH_X86_64: |
57183d11 | 109 | return "x86-64"; |
aa34055f | 110 | case SCMP_ARCH_X32: |
57183d11 | 111 | return "x32"; |
aa34055f | 112 | case SCMP_ARCH_ARM: |
57183d11 | 113 | return "arm"; |
aa34055f ZJS |
114 | case SCMP_ARCH_AARCH64: |
115 | return "arm64"; | |
116 | case SCMP_ARCH_MIPS: | |
117 | return "mips"; | |
118 | case SCMP_ARCH_MIPS64: | |
119 | return "mips64"; | |
120 | case SCMP_ARCH_MIPS64N32: | |
121 | return "mips64-n32"; | |
122 | case SCMP_ARCH_MIPSEL: | |
123 | return "mips-le"; | |
124 | case SCMP_ARCH_MIPSEL64: | |
125 | return "mips64-le"; | |
126 | case SCMP_ARCH_MIPSEL64N32: | |
127 | return "mips64-le-n32"; | |
128 | case SCMP_ARCH_PPC: | |
129 | return "ppc"; | |
130 | case SCMP_ARCH_PPC64: | |
131 | return "ppc64"; | |
132 | case SCMP_ARCH_PPC64LE: | |
133 | return "ppc64-le"; | |
134 | case SCMP_ARCH_S390: | |
6abfd303 | 135 | return "s390"; |
aa34055f | 136 | case SCMP_ARCH_S390X: |
6abfd303 | 137 | return "s390x"; |
aa34055f ZJS |
138 | default: |
139 | return NULL; | |
140 | } | |
57183d11 LP |
141 | } |
142 | ||
143 | int seccomp_arch_from_string(const char *n, uint32_t *ret) { | |
144 | if (!n) | |
145 | return -EINVAL; | |
146 | ||
147 | assert(ret); | |
148 | ||
149 | if (streq(n, "native")) | |
150 | *ret = SCMP_ARCH_NATIVE; | |
151 | else if (streq(n, "x86")) | |
152 | *ret = SCMP_ARCH_X86; | |
153 | else if (streq(n, "x86-64")) | |
154 | *ret = SCMP_ARCH_X86_64; | |
155 | else if (streq(n, "x32")) | |
156 | *ret = SCMP_ARCH_X32; | |
157 | else if (streq(n, "arm")) | |
158 | *ret = SCMP_ARCH_ARM; | |
aa34055f ZJS |
159 | else if (streq(n, "arm64")) |
160 | *ret = SCMP_ARCH_AARCH64; | |
161 | else if (streq(n, "mips")) | |
162 | *ret = SCMP_ARCH_MIPS; | |
163 | else if (streq(n, "mips64")) | |
164 | *ret = SCMP_ARCH_MIPS64; | |
165 | else if (streq(n, "mips64-n32")) | |
166 | *ret = SCMP_ARCH_MIPS64N32; | |
167 | else if (streq(n, "mips-le")) | |
168 | *ret = SCMP_ARCH_MIPSEL; | |
169 | else if (streq(n, "mips64-le")) | |
170 | *ret = SCMP_ARCH_MIPSEL64; | |
171 | else if (streq(n, "mips64-le-n32")) | |
172 | *ret = SCMP_ARCH_MIPSEL64N32; | |
173 | else if (streq(n, "ppc")) | |
174 | *ret = SCMP_ARCH_PPC; | |
175 | else if (streq(n, "ppc64")) | |
176 | *ret = SCMP_ARCH_PPC64; | |
177 | else if (streq(n, "ppc64-le")) | |
178 | *ret = SCMP_ARCH_PPC64LE; | |
6abfd303 HB |
179 | else if (streq(n, "s390")) |
180 | *ret = SCMP_ARCH_S390; | |
181 | else if (streq(n, "s390x")) | |
182 | *ret = SCMP_ARCH_S390X; | |
57183d11 LP |
183 | else |
184 | return -EINVAL; | |
185 | ||
186 | return 0; | |
187 | } | |
e9642be2 | 188 | |
469830d1 | 189 | int seccomp_init_for_arch(scmp_filter_ctx *ret, uint32_t arch, uint32_t default_action) { |
8d7b0c8f LP |
190 | scmp_filter_ctx seccomp; |
191 | int r; | |
192 | ||
469830d1 LP |
193 | /* Much like seccomp_init(), but initializes the filter for one specific architecture only, without affecting |
194 | * any others. Also, turns off the NNP fiddling. */ | |
8d7b0c8f LP |
195 | |
196 | seccomp = seccomp_init(default_action); | |
197 | if (!seccomp) | |
198 | return -ENOMEM; | |
199 | ||
469830d1 LP |
200 | if (arch != SCMP_ARCH_NATIVE && |
201 | arch != seccomp_arch_native()) { | |
202 | ||
1b52793d | 203 | r = seccomp_arch_remove(seccomp, seccomp_arch_native()); |
469830d1 LP |
204 | if (r < 0) |
205 | goto finish; | |
206 | ||
1b52793d | 207 | r = seccomp_arch_add(seccomp, arch); |
469830d1 LP |
208 | if (r < 0) |
209 | goto finish; | |
210 | ||
211 | assert(seccomp_arch_exist(seccomp, arch) >= 0); | |
212 | assert(seccomp_arch_exist(seccomp, SCMP_ARCH_NATIVE) == -EEXIST); | |
213 | assert(seccomp_arch_exist(seccomp, seccomp_arch_native()) == -EEXIST); | |
214 | } else { | |
215 | assert(seccomp_arch_exist(seccomp, SCMP_ARCH_NATIVE) >= 0); | |
216 | assert(seccomp_arch_exist(seccomp, seccomp_arch_native()) >= 0); | |
217 | } | |
218 | ||
219 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_ACT_BADARCH, SCMP_ACT_ALLOW); | |
8d7b0c8f LP |
220 | if (r < 0) |
221 | goto finish; | |
222 | ||
223 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
224 | if (r < 0) | |
225 | goto finish; | |
226 | ||
227 | *ret = seccomp; | |
228 | return 0; | |
229 | ||
230 | finish: | |
231 | seccomp_release(seccomp); | |
232 | return r; | |
233 | } | |
234 | ||
d347d902 | 235 | static bool is_basic_seccomp_available(void) { |
4d5bd50a | 236 | return prctl(PR_GET_SECCOMP, 0, 0, 0, 0) >= 0; |
d347d902 FS |
237 | } |
238 | ||
239 | static bool is_seccomp_filter_available(void) { | |
4d5bd50a LP |
240 | return prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, 0, 0) < 0 && |
241 | errno == EFAULT; | |
d347d902 FS |
242 | } |
243 | ||
83f12b27 | 244 | bool is_seccomp_available(void) { |
83f12b27 | 245 | static int cached_enabled = -1; |
4d5bd50a | 246 | |
83f12b27 | 247 | if (cached_enabled < 0) |
4d5bd50a LP |
248 | cached_enabled = |
249 | is_basic_seccomp_available() && | |
250 | is_seccomp_filter_available(); | |
251 | ||
83f12b27 FS |
252 | return cached_enabled; |
253 | } | |
254 | ||
8130926d | 255 | const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = { |
40eb6a80 | 256 | [SYSCALL_FILTER_SET_DEFAULT] = { |
40eb6a80 | 257 | .name = "@default", |
d5efc18b | 258 | .help = "System calls that are always permitted", |
40eb6a80 ZJS |
259 | .value = |
260 | "clock_getres\0" | |
6ca67710 | 261 | "clock_getres_time64\0" |
40eb6a80 | 262 | "clock_gettime\0" |
6ca67710 | 263 | "clock_gettime64\0" |
40eb6a80 | 264 | "clock_nanosleep\0" |
6ca67710 | 265 | "clock_nanosleep_time64\0" |
40eb6a80 ZJS |
266 | "execve\0" |
267 | "exit\0" | |
268 | "exit_group\0" | |
e41b0f42 | 269 | "futex\0" |
6ca67710 | 270 | "futex_time64\0" |
e41b0f42 LP |
271 | "get_robust_list\0" |
272 | "get_thread_area\0" | |
09d3020b DH |
273 | "getegid\0" |
274 | "getegid32\0" | |
275 | "geteuid\0" | |
276 | "geteuid32\0" | |
277 | "getgid\0" | |
278 | "getgid32\0" | |
279 | "getgroups\0" | |
280 | "getgroups32\0" | |
281 | "getpgid\0" | |
282 | "getpgrp\0" | |
283 | "getpid\0" | |
284 | "getppid\0" | |
285 | "getresgid\0" | |
286 | "getresgid32\0" | |
287 | "getresuid\0" | |
288 | "getresuid32\0" | |
40eb6a80 | 289 | "getrlimit\0" /* make sure processes can query stack size and such */ |
09d3020b DH |
290 | "getsid\0" |
291 | "gettid\0" | |
40eb6a80 | 292 | "gettimeofday\0" |
09d3020b DH |
293 | "getuid\0" |
294 | "getuid32\0" | |
e41b0f42 | 295 | "membarrier\0" |
40eb6a80 ZJS |
296 | "nanosleep\0" |
297 | "pause\0" | |
4c3a9176 | 298 | "prlimit64\0" |
e41b0f42 | 299 | "restart_syscall\0" |
6fee3be0 | 300 | "rseq\0" |
40eb6a80 | 301 | "rt_sigreturn\0" |
8f44de08 | 302 | "sched_yield\0" |
e41b0f42 LP |
303 | "set_robust_list\0" |
304 | "set_thread_area\0" | |
305 | "set_tid_address\0" | |
ce5faeac | 306 | "set_tls\0" |
40eb6a80 ZJS |
307 | "sigreturn\0" |
308 | "time\0" | |
4c3a9176 | 309 | "ugetrlimit\0" |
40eb6a80 | 310 | }, |
44898c53 LP |
311 | [SYSCALL_FILTER_SET_AIO] = { |
312 | .name = "@aio", | |
313 | .help = "Asynchronous IO", | |
314 | .value = | |
315 | "io_cancel\0" | |
316 | "io_destroy\0" | |
317 | "io_getevents\0" | |
a05cfe23 | 318 | "io_pgetevents\0" |
6ca67710 | 319 | "io_pgetevents_time64\0" |
44898c53 LP |
320 | "io_setup\0" |
321 | "io_submit\0" | |
9e486265 LP |
322 | "io_uring_enter\0" |
323 | "io_uring_register\0" | |
324 | "io_uring_setup\0" | |
44898c53 | 325 | }, |
133ddbbe | 326 | [SYSCALL_FILTER_SET_BASIC_IO] = { |
133ddbbe | 327 | .name = "@basic-io", |
d5efc18b | 328 | .help = "Basic IO", |
133ddbbe | 329 | .value = |
648a0ed0 | 330 | "_llseek\0" |
133ddbbe | 331 | "close\0" |
648a0ed0 | 332 | "dup\0" |
133ddbbe LP |
333 | "dup2\0" |
334 | "dup3\0" | |
133ddbbe LP |
335 | "lseek\0" |
336 | "pread64\0" | |
337 | "preadv\0" | |
44898c53 | 338 | "preadv2\0" |
133ddbbe LP |
339 | "pwrite64\0" |
340 | "pwritev\0" | |
44898c53 | 341 | "pwritev2\0" |
133ddbbe LP |
342 | "read\0" |
343 | "readv\0" | |
344 | "write\0" | |
345 | "writev\0" | |
346 | }, | |
44898c53 LP |
347 | [SYSCALL_FILTER_SET_CHOWN] = { |
348 | .name = "@chown", | |
349 | .help = "Change ownership of files and directories", | |
350 | .value = | |
351 | "chown\0" | |
352 | "chown32\0" | |
353 | "fchown\0" | |
354 | "fchown32\0" | |
355 | "fchownat\0" | |
356 | "lchown\0" | |
357 | "lchown32\0" | |
358 | }, | |
8130926d | 359 | [SYSCALL_FILTER_SET_CLOCK] = { |
8130926d | 360 | .name = "@clock", |
d5efc18b | 361 | .help = "Change the system time", |
201c1cc2 TM |
362 | .value = |
363 | "adjtimex\0" | |
1f9ac68b | 364 | "clock_adjtime\0" |
6ca67710 | 365 | "clock_adjtime64\0" |
1f9ac68b | 366 | "clock_settime\0" |
6ca67710 | 367 | "clock_settime64\0" |
201c1cc2 | 368 | "settimeofday\0" |
1f9ac68b | 369 | "stime\0" |
8130926d LP |
370 | }, |
371 | [SYSCALL_FILTER_SET_CPU_EMULATION] = { | |
8130926d | 372 | .name = "@cpu-emulation", |
d5efc18b | 373 | .help = "System calls for CPU emulation functionality", |
1f9ac68b LP |
374 | .value = |
375 | "modify_ldt\0" | |
376 | "subpage_prot\0" | |
377 | "switch_endian\0" | |
378 | "vm86\0" | |
379 | "vm86old\0" | |
8130926d LP |
380 | }, |
381 | [SYSCALL_FILTER_SET_DEBUG] = { | |
8130926d | 382 | .name = "@debug", |
d5efc18b | 383 | .help = "Debugging, performance monitoring and tracing functionality", |
1f9ac68b LP |
384 | .value = |
385 | "lookup_dcookie\0" | |
386 | "perf_event_open\0" | |
8270e3d8 | 387 | "pidfd_getfd\0" |
1f9ac68b LP |
388 | "ptrace\0" |
389 | "rtas\0" | |
8130926d | 390 | #ifdef __NR_s390_runtime_instr |
1f9ac68b | 391 | "s390_runtime_instr\0" |
8130926d | 392 | #endif |
1f9ac68b | 393 | "sys_debug_setcontext\0" |
8130926d | 394 | }, |
1a1b13c9 LP |
395 | [SYSCALL_FILTER_SET_FILE_SYSTEM] = { |
396 | .name = "@file-system", | |
397 | .help = "File system operations", | |
398 | .value = | |
399 | "access\0" | |
400 | "chdir\0" | |
401 | "chmod\0" | |
402 | "close\0" | |
403 | "creat\0" | |
404 | "faccessat\0" | |
405 | "fallocate\0" | |
406 | "fchdir\0" | |
407 | "fchmod\0" | |
408 | "fchmodat\0" | |
1a1b13c9 | 409 | "fcntl\0" |
ceaa6aa7 | 410 | "fcntl64\0" |
1a1b13c9 LP |
411 | "fgetxattr\0" |
412 | "flistxattr\0" | |
ceaa6aa7 | 413 | "fremovexattr\0" |
1a1b13c9 | 414 | "fsetxattr\0" |
1a1b13c9 | 415 | "fstat\0" |
ceaa6aa7 | 416 | "fstat64\0" |
1a1b13c9 | 417 | "fstatat64\0" |
1a1b13c9 | 418 | "fstatfs\0" |
ceaa6aa7 | 419 | "fstatfs64\0" |
1a1b13c9 | 420 | "ftruncate\0" |
ceaa6aa7 | 421 | "ftruncate64\0" |
1a1b13c9 LP |
422 | "futimesat\0" |
423 | "getcwd\0" | |
1a1b13c9 | 424 | "getdents\0" |
ceaa6aa7 | 425 | "getdents64\0" |
1a1b13c9 LP |
426 | "getxattr\0" |
427 | "inotify_add_watch\0" | |
ceaa6aa7 | 428 | "inotify_init\0" |
1a1b13c9 LP |
429 | "inotify_init1\0" |
430 | "inotify_rm_watch\0" | |
431 | "lgetxattr\0" | |
432 | "link\0" | |
433 | "linkat\0" | |
434 | "listxattr\0" | |
435 | "llistxattr\0" | |
436 | "lremovexattr\0" | |
437 | "lsetxattr\0" | |
1a1b13c9 | 438 | "lstat\0" |
ceaa6aa7 | 439 | "lstat64\0" |
1a1b13c9 LP |
440 | "mkdir\0" |
441 | "mkdirat\0" | |
442 | "mknod\0" | |
443 | "mknodat\0" | |
1a1b13c9 | 444 | "mmap\0" |
ceaa6aa7 | 445 | "mmap2\0" |
7961116e | 446 | "munmap\0" |
1a1b13c9 | 447 | "newfstatat\0" |
ceaa6aa7 LP |
448 | "oldfstat\0" |
449 | "oldlstat\0" | |
450 | "oldstat\0" | |
1a1b13c9 LP |
451 | "open\0" |
452 | "openat\0" | |
8270e3d8 | 453 | "openat2\0" |
1a1b13c9 LP |
454 | "readlink\0" |
455 | "readlinkat\0" | |
456 | "removexattr\0" | |
457 | "rename\0" | |
1a1b13c9 | 458 | "renameat\0" |
ceaa6aa7 | 459 | "renameat2\0" |
1a1b13c9 LP |
460 | "rmdir\0" |
461 | "setxattr\0" | |
1a1b13c9 | 462 | "stat\0" |
ceaa6aa7 | 463 | "stat64\0" |
1a1b13c9 | 464 | "statfs\0" |
ceaa6aa7 | 465 | "statfs64\0" |
8e6a7a8b | 466 | #ifdef __NR_statx |
a4135a74 | 467 | "statx\0" |
ceaa6aa7 | 468 | #endif |
1a1b13c9 LP |
469 | "symlink\0" |
470 | "symlinkat\0" | |
1a1b13c9 | 471 | "truncate\0" |
ceaa6aa7 | 472 | "truncate64\0" |
1a1b13c9 LP |
473 | "unlink\0" |
474 | "unlinkat\0" | |
ceaa6aa7 | 475 | "utime\0" |
1a1b13c9 | 476 | "utimensat\0" |
6ca67710 | 477 | "utimensat_time64\0" |
1a1b13c9 LP |
478 | "utimes\0" |
479 | }, | |
8130926d | 480 | [SYSCALL_FILTER_SET_IO_EVENT] = { |
8130926d | 481 | .name = "@io-event", |
d5efc18b | 482 | .help = "Event loop system calls", |
201c1cc2 TM |
483 | .value = |
484 | "_newselect\0" | |
201c1cc2 | 485 | "epoll_create\0" |
215728ff | 486 | "epoll_create1\0" |
201c1cc2 TM |
487 | "epoll_ctl\0" |
488 | "epoll_ctl_old\0" | |
489 | "epoll_pwait\0" | |
490 | "epoll_wait\0" | |
491 | "epoll_wait_old\0" | |
201c1cc2 | 492 | "eventfd\0" |
215728ff | 493 | "eventfd2\0" |
201c1cc2 TM |
494 | "poll\0" |
495 | "ppoll\0" | |
6ca67710 | 496 | "ppoll_time64\0" |
201c1cc2 | 497 | "pselect6\0" |
6ca67710 | 498 | "pselect6_time64\0" |
201c1cc2 | 499 | "select\0" |
8130926d LP |
500 | }, |
501 | [SYSCALL_FILTER_SET_IPC] = { | |
8130926d | 502 | .name = "@ipc", |
d5efc18b ZJS |
503 | .help = "SysV IPC, POSIX Message Queues or other IPC", |
504 | .value = | |
505 | "ipc\0" | |
cd5bfd7e | 506 | "memfd_create\0" |
201c1cc2 TM |
507 | "mq_getsetattr\0" |
508 | "mq_notify\0" | |
509 | "mq_open\0" | |
510 | "mq_timedreceive\0" | |
6ca67710 | 511 | "mq_timedreceive_time64\0" |
201c1cc2 | 512 | "mq_timedsend\0" |
6ca67710 | 513 | "mq_timedsend_time64\0" |
201c1cc2 TM |
514 | "mq_unlink\0" |
515 | "msgctl\0" | |
516 | "msgget\0" | |
517 | "msgrcv\0" | |
518 | "msgsnd\0" | |
cd5bfd7e | 519 | "pipe\0" |
215728ff | 520 | "pipe2\0" |
201c1cc2 TM |
521 | "process_vm_readv\0" |
522 | "process_vm_writev\0" | |
523 | "semctl\0" | |
524 | "semget\0" | |
525 | "semop\0" | |
526 | "semtimedop\0" | |
6ca67710 | 527 | "semtimedop_time64\0" |
201c1cc2 TM |
528 | "shmat\0" |
529 | "shmctl\0" | |
530 | "shmdt\0" | |
531 | "shmget\0" | |
8130926d LP |
532 | }, |
533 | [SYSCALL_FILTER_SET_KEYRING] = { | |
8130926d | 534 | .name = "@keyring", |
d5efc18b | 535 | .help = "Kernel keyring access", |
1f9ac68b LP |
536 | .value = |
537 | "add_key\0" | |
538 | "keyctl\0" | |
539 | "request_key\0" | |
8130926d | 540 | }, |
cd0ddf6f LP |
541 | [SYSCALL_FILTER_SET_MEMLOCK] = { |
542 | .name = "@memlock", | |
543 | .help = "Memory locking control", | |
544 | .value = | |
545 | "mlock\0" | |
546 | "mlock2\0" | |
547 | "mlockall\0" | |
548 | "munlock\0" | |
549 | "munlockall\0" | |
550 | }, | |
8130926d | 551 | [SYSCALL_FILTER_SET_MODULE] = { |
8130926d | 552 | .name = "@module", |
d5efc18b | 553 | .help = "Loading and unloading of kernel modules", |
201c1cc2 | 554 | .value = |
201c1cc2 TM |
555 | "delete_module\0" |
556 | "finit_module\0" | |
557 | "init_module\0" | |
8130926d LP |
558 | }, |
559 | [SYSCALL_FILTER_SET_MOUNT] = { | |
8130926d | 560 | .name = "@mount", |
d5efc18b | 561 | .help = "Mounting and unmounting of file systems", |
201c1cc2 TM |
562 | .value = |
563 | "chroot\0" | |
9e486265 LP |
564 | "fsconfig\0" |
565 | "fsmount\0" | |
566 | "fsopen\0" | |
567 | "fspick\0" | |
201c1cc2 | 568 | "mount\0" |
9e486265 LP |
569 | "move_mount\0" |
570 | "open_tree\0" | |
201c1cc2 | 571 | "pivot_root\0" |
201c1cc2 | 572 | "umount\0" |
215728ff | 573 | "umount2\0" |
8130926d LP |
574 | }, |
575 | [SYSCALL_FILTER_SET_NETWORK_IO] = { | |
8130926d | 576 | .name = "@network-io", |
d5efc18b | 577 | .help = "Network or Unix socket IO, should not be needed if not network facing", |
201c1cc2 | 578 | .value = |
201c1cc2 | 579 | "accept\0" |
215728ff | 580 | "accept4\0" |
201c1cc2 TM |
581 | "bind\0" |
582 | "connect\0" | |
583 | "getpeername\0" | |
584 | "getsockname\0" | |
585 | "getsockopt\0" | |
586 | "listen\0" | |
587 | "recv\0" | |
588 | "recvfrom\0" | |
589 | "recvmmsg\0" | |
6ca67710 | 590 | "recvmmsg_time64\0" |
201c1cc2 TM |
591 | "recvmsg\0" |
592 | "send\0" | |
593 | "sendmmsg\0" | |
594 | "sendmsg\0" | |
595 | "sendto\0" | |
596 | "setsockopt\0" | |
597 | "shutdown\0" | |
598 | "socket\0" | |
599 | "socketcall\0" | |
600 | "socketpair\0" | |
8130926d LP |
601 | }, |
602 | [SYSCALL_FILTER_SET_OBSOLETE] = { | |
d5efc18b | 603 | /* some unknown even to libseccomp */ |
8130926d | 604 | .name = "@obsolete", |
d5efc18b | 605 | .help = "Unusual, obsolete or unimplemented system calls", |
201c1cc2 TM |
606 | .value = |
607 | "_sysctl\0" | |
608 | "afs_syscall\0" | |
802fa07a | 609 | "bdflush\0" |
201c1cc2 | 610 | "break\0" |
1f9ac68b | 611 | "create_module\0" |
201c1cc2 TM |
612 | "ftime\0" |
613 | "get_kernel_syms\0" | |
201c1cc2 TM |
614 | "getpmsg\0" |
615 | "gtty\0" | |
7e0c3b8f | 616 | "idle\0" |
201c1cc2 | 617 | "lock\0" |
201c1cc2 | 618 | "mpx\0" |
201c1cc2 TM |
619 | "prof\0" |
620 | "profil\0" | |
201c1cc2 TM |
621 | "putpmsg\0" |
622 | "query_module\0" | |
201c1cc2 TM |
623 | "security\0" |
624 | "sgetmask\0" | |
625 | "ssetmask\0" | |
626 | "stty\0" | |
1f9ac68b | 627 | "sysfs\0" |
201c1cc2 TM |
628 | "tuxcall\0" |
629 | "ulimit\0" | |
630 | "uselib\0" | |
1f9ac68b | 631 | "ustat\0" |
201c1cc2 | 632 | "vserver\0" |
8130926d | 633 | }, |
9493b168 ZJS |
634 | [SYSCALL_FILTER_SET_PKEY] = { |
635 | .name = "@pkey", | |
636 | .help = "System calls used for memory protection keys", | |
637 | .value = | |
638 | "pkey_alloc\0" | |
639 | "pkey_free\0" | |
640 | "pkey_mprotect\0" | |
641 | }, | |
8130926d | 642 | [SYSCALL_FILTER_SET_PRIVILEGED] = { |
8130926d | 643 | .name = "@privileged", |
d5efc18b | 644 | .help = "All system calls which need super-user capabilities", |
201c1cc2 | 645 | .value = |
44898c53 | 646 | "@chown\0" |
201c1cc2 TM |
647 | "@clock\0" |
648 | "@module\0" | |
649 | "@raw-io\0" | |
af0f047b LP |
650 | "@reboot\0" |
651 | "@swap\0" | |
215728ff | 652 | "_sysctl\0" |
201c1cc2 | 653 | "acct\0" |
201c1cc2 | 654 | "bpf\0" |
1f9ac68b | 655 | "capset\0" |
201c1cc2 | 656 | "chroot\0" |
a05cfe23 | 657 | "fanotify_init\0" |
9e486265 | 658 | "fanotify_mark\0" |
201c1cc2 | 659 | "nfsservctl\0" |
a05cfe23 | 660 | "open_by_handle_at\0" |
201c1cc2 TM |
661 | "pivot_root\0" |
662 | "quotactl\0" | |
201c1cc2 | 663 | "setdomainname\0" |
201c1cc2 | 664 | "setfsuid\0" |
215728ff | 665 | "setfsuid32\0" |
201c1cc2 | 666 | "setgroups\0" |
215728ff | 667 | "setgroups32\0" |
201c1cc2 | 668 | "sethostname\0" |
201c1cc2 | 669 | "setresuid\0" |
215728ff | 670 | "setresuid32\0" |
201c1cc2 | 671 | "setreuid\0" |
215728ff | 672 | "setreuid32\0" |
e05ee49b | 673 | "setuid\0" /* We list the explicit system calls here, as @setuid also includes setgid() which is not necessarily privileged */ |
215728ff | 674 | "setuid32\0" |
201c1cc2 | 675 | "vhangup\0" |
8130926d LP |
676 | }, |
677 | [SYSCALL_FILTER_SET_PROCESS] = { | |
8130926d | 678 | .name = "@process", |
d5efc18b | 679 | .help = "Process control, execution, namespaceing operations", |
201c1cc2 TM |
680 | .value = |
681 | "arch_prctl\0" | |
09d3020b | 682 | "capget\0" /* Able to query arbitrary processes */ |
201c1cc2 | 683 | "clone\0" |
9e486265 | 684 | "clone3\0" |
201c1cc2 TM |
685 | "execveat\0" |
686 | "fork\0" | |
b887d2eb | 687 | "getrusage\0" |
201c1cc2 | 688 | "kill\0" |
9e486265 | 689 | "pidfd_open\0" |
46fcf95d | 690 | "pidfd_send_signal\0" |
201c1cc2 | 691 | "prctl\0" |
b887d2eb LP |
692 | "rt_sigqueueinfo\0" |
693 | "rt_tgsigqueueinfo\0" | |
201c1cc2 | 694 | "setns\0" |
a9518dc3 | 695 | "swapcontext\0" /* Some archs e.g. powerpc32 are using it to do userspace context switches */ |
201c1cc2 | 696 | "tgkill\0" |
b887d2eb | 697 | "times\0" |
201c1cc2 TM |
698 | "tkill\0" |
699 | "unshare\0" | |
700 | "vfork\0" | |
b887d2eb LP |
701 | "wait4\0" |
702 | "waitid\0" | |
703 | "waitpid\0" | |
8130926d LP |
704 | }, |
705 | [SYSCALL_FILTER_SET_RAW_IO] = { | |
8130926d | 706 | .name = "@raw-io", |
d5efc18b | 707 | .help = "Raw I/O port access", |
201c1cc2 TM |
708 | .value = |
709 | "ioperm\0" | |
710 | "iopl\0" | |
1f9ac68b | 711 | "pciconfig_iobase\0" |
201c1cc2 TM |
712 | "pciconfig_read\0" |
713 | "pciconfig_write\0" | |
8130926d | 714 | #ifdef __NR_s390_pci_mmio_read |
201c1cc2 | 715 | "s390_pci_mmio_read\0" |
8130926d LP |
716 | #endif |
717 | #ifdef __NR_s390_pci_mmio_write | |
201c1cc2 | 718 | "s390_pci_mmio_write\0" |
8130926d LP |
719 | #endif |
720 | }, | |
bd2ab3f4 LP |
721 | [SYSCALL_FILTER_SET_REBOOT] = { |
722 | .name = "@reboot", | |
723 | .help = "Reboot and reboot preparation/kexec", | |
724 | .value = | |
bd2ab3f4 | 725 | "kexec_file_load\0" |
e59608fa | 726 | "kexec_load\0" |
bd2ab3f4 LP |
727 | "reboot\0" |
728 | }, | |
133ddbbe | 729 | [SYSCALL_FILTER_SET_RESOURCES] = { |
133ddbbe | 730 | .name = "@resources", |
58a8f68b | 731 | .help = "Alter resource settings", |
133ddbbe | 732 | .value = |
0963c053 LP |
733 | "ioprio_set\0" |
734 | "mbind\0" | |
735 | "migrate_pages\0" | |
736 | "move_pages\0" | |
737 | "nice\0" | |
0963c053 LP |
738 | "sched_setaffinity\0" |
739 | "sched_setattr\0" | |
133ddbbe LP |
740 | "sched_setparam\0" |
741 | "sched_setscheduler\0" | |
0963c053 | 742 | "set_mempolicy\0" |
133ddbbe LP |
743 | "setpriority\0" |
744 | "setrlimit\0" | |
133ddbbe | 745 | }, |
6eaaeee9 LP |
746 | [SYSCALL_FILTER_SET_SETUID] = { |
747 | .name = "@setuid", | |
748 | .help = "Operations for changing user/group credentials", | |
749 | .value = | |
6eaaeee9 | 750 | "setgid\0" |
215728ff | 751 | "setgid32\0" |
6eaaeee9 | 752 | "setgroups\0" |
215728ff | 753 | "setgroups32\0" |
6eaaeee9 | 754 | "setregid\0" |
215728ff | 755 | "setregid32\0" |
6eaaeee9 | 756 | "setresgid\0" |
215728ff | 757 | "setresgid32\0" |
6eaaeee9 | 758 | "setresuid\0" |
215728ff | 759 | "setresuid32\0" |
6eaaeee9 | 760 | "setreuid\0" |
215728ff | 761 | "setreuid32\0" |
6eaaeee9 | 762 | "setuid\0" |
215728ff | 763 | "setuid32\0" |
6eaaeee9 | 764 | }, |
cd0ddf6f LP |
765 | [SYSCALL_FILTER_SET_SIGNAL] = { |
766 | .name = "@signal", | |
767 | .help = "Process signal handling", | |
768 | .value = | |
769 | "rt_sigaction\0" | |
770 | "rt_sigpending\0" | |
771 | "rt_sigprocmask\0" | |
772 | "rt_sigsuspend\0" | |
773 | "rt_sigtimedwait\0" | |
6ca67710 | 774 | "rt_sigtimedwait_time64\0" |
cd0ddf6f LP |
775 | "sigaction\0" |
776 | "sigaltstack\0" | |
777 | "signal\0" | |
778 | "signalfd\0" | |
779 | "signalfd4\0" | |
780 | "sigpending\0" | |
781 | "sigprocmask\0" | |
782 | "sigsuspend\0" | |
783 | }, | |
bd2ab3f4 LP |
784 | [SYSCALL_FILTER_SET_SWAP] = { |
785 | .name = "@swap", | |
786 | .help = "Enable/disable swap devices", | |
787 | .value = | |
788 | "swapoff\0" | |
789 | "swapon\0" | |
790 | }, | |
44898c53 LP |
791 | [SYSCALL_FILTER_SET_SYNC] = { |
792 | .name = "@sync", | |
793 | .help = "Synchronize files and memory to storage", | |
794 | .value = | |
795 | "fdatasync\0" | |
796 | "fsync\0" | |
797 | "msync\0" | |
798 | "sync\0" | |
799 | "sync_file_range\0" | |
a8fb09f5 | 800 | "sync_file_range2\0" |
44898c53 LP |
801 | "syncfs\0" |
802 | }, | |
70526841 LP |
803 | [SYSCALL_FILTER_SET_SYSTEM_SERVICE] = { |
804 | .name = "@system-service", | |
805 | .help = "General system service operations", | |
806 | .value = | |
807 | "@aio\0" | |
808 | "@basic-io\0" | |
809 | "@chown\0" | |
810 | "@default\0" | |
811 | "@file-system\0" | |
812 | "@io-event\0" | |
813 | "@ipc\0" | |
814 | "@keyring\0" | |
815 | "@memlock\0" | |
816 | "@network-io\0" | |
817 | "@process\0" | |
818 | "@resources\0" | |
819 | "@setuid\0" | |
820 | "@signal\0" | |
821 | "@sync\0" | |
822 | "@timer\0" | |
823 | "brk\0" | |
824 | "capget\0" | |
825 | "capset\0" | |
826 | "copy_file_range\0" | |
827 | "fadvise64\0" | |
828 | "fadvise64_64\0" | |
829 | "flock\0" | |
830 | "get_mempolicy\0" | |
831 | "getcpu\0" | |
832 | "getpriority\0" | |
833 | "getrandom\0" | |
834 | "ioctl\0" | |
835 | "ioprio_get\0" | |
836 | "kcmp\0" | |
837 | "madvise\0" | |
70526841 LP |
838 | "mprotect\0" |
839 | "mremap\0" | |
840 | "name_to_handle_at\0" | |
841 | "oldolduname\0" | |
842 | "olduname\0" | |
843 | "personality\0" | |
844 | "readahead\0" | |
845 | "readdir\0" | |
846 | "remap_file_pages\0" | |
847 | "sched_get_priority_max\0" | |
848 | "sched_get_priority_min\0" | |
849 | "sched_getaffinity\0" | |
850 | "sched_getattr\0" | |
851 | "sched_getparam\0" | |
852 | "sched_getscheduler\0" | |
853 | "sched_rr_get_interval\0" | |
6ca67710 | 854 | "sched_rr_get_interval_time64\0" |
70526841 LP |
855 | "sched_yield\0" |
856 | "sendfile\0" | |
857 | "sendfile64\0" | |
858 | "setfsgid\0" | |
859 | "setfsgid32\0" | |
860 | "setfsuid\0" | |
861 | "setfsuid32\0" | |
862 | "setpgid\0" | |
863 | "setsid\0" | |
864 | "splice\0" | |
865 | "sysinfo\0" | |
866 | "tee\0" | |
867 | "umask\0" | |
868 | "uname\0" | |
869 | "userfaultfd\0" | |
870 | "vmsplice\0" | |
871 | }, | |
cd0ddf6f LP |
872 | [SYSCALL_FILTER_SET_TIMER] = { |
873 | .name = "@timer", | |
874 | .help = "Schedule operations by time", | |
875 | .value = | |
876 | "alarm\0" | |
877 | "getitimer\0" | |
878 | "setitimer\0" | |
879 | "timer_create\0" | |
880 | "timer_delete\0" | |
881 | "timer_getoverrun\0" | |
882 | "timer_gettime\0" | |
6ca67710 | 883 | "timer_gettime64\0" |
cd0ddf6f | 884 | "timer_settime\0" |
6ca67710 | 885 | "timer_settime64\0" |
cd0ddf6f LP |
886 | "timerfd_create\0" |
887 | "timerfd_gettime\0" | |
6ca67710 | 888 | "timerfd_gettime64\0" |
cd0ddf6f | 889 | "timerfd_settime\0" |
6ca67710 | 890 | "timerfd_settime64\0" |
cd0ddf6f LP |
891 | "times\0" |
892 | }, | |
201c1cc2 | 893 | }; |
8130926d LP |
894 | |
895 | const SyscallFilterSet *syscall_filter_set_find(const char *name) { | |
896 | unsigned i; | |
897 | ||
898 | if (isempty(name) || name[0] != '@') | |
899 | return NULL; | |
900 | ||
901 | for (i = 0; i < _SYSCALL_FILTER_SET_MAX; i++) | |
902 | if (streq(syscall_filter_sets[i].name, name)) | |
903 | return syscall_filter_sets + i; | |
904 | ||
905 | return NULL; | |
906 | } | |
907 | ||
b54f36c6 | 908 | static int seccomp_add_syscall_filter_set(scmp_filter_ctx seccomp, const SyscallFilterSet *set, uint32_t action, char **exclude, bool log_missing); |
69b1b241 | 909 | |
b54f36c6 | 910 | int seccomp_add_syscall_filter_item(scmp_filter_ctx *seccomp, const char *name, uint32_t action, char **exclude, bool log_missing) { |
69b1b241 LP |
911 | assert(seccomp); |
912 | assert(name); | |
913 | ||
960e4569 LP |
914 | if (strv_contains(exclude, name)) |
915 | return 0; | |
916 | ||
69b1b241 LP |
917 | if (name[0] == '@') { |
918 | const SyscallFilterSet *other; | |
919 | ||
920 | other = syscall_filter_set_find(name); | |
baaa35ad ZJS |
921 | if (!other) |
922 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
923 | "Filter set %s is not known!", | |
924 | name); | |
69b1b241 | 925 | |
b54f36c6 ZJS |
926 | return seccomp_add_syscall_filter_set(seccomp, other, action, exclude, log_missing); |
927 | ||
69b1b241 | 928 | } else { |
b54f36c6 | 929 | int id, r; |
69b1b241 LP |
930 | |
931 | id = seccomp_syscall_resolve_name(name); | |
cff7bff8 | 932 | if (id == __NR_SCMP_ERROR) { |
b54f36c6 ZJS |
933 | if (log_missing) |
934 | log_debug("System call %s is not known, ignoring.", name); | |
ff217dc3 | 935 | return 0; |
cff7bff8 | 936 | } |
69b1b241 LP |
937 | |
938 | r = seccomp_rule_add_exact(seccomp, action, id, 0); | |
b54f36c6 | 939 | if (r < 0) { |
69b1b241 | 940 | /* If the system call is not known on this architecture, then that's fine, let's ignore it */ |
7e86bd73 ZJS |
941 | bool ignore = r == -EDOM; |
942 | ||
943 | if (!ignore || log_missing) | |
944 | log_debug_errno(r, "Failed to add rule for system call %s() / %d%s: %m", | |
945 | name, id, ignore ? ", ignoring" : ""); | |
946 | if (!ignore) | |
947 | return r; | |
b54f36c6 | 948 | } |
69b1b241 | 949 | |
b54f36c6 ZJS |
950 | return 0; |
951 | } | |
69b1b241 LP |
952 | } |
953 | ||
469830d1 LP |
954 | static int seccomp_add_syscall_filter_set( |
955 | scmp_filter_ctx seccomp, | |
469830d1 | 956 | const SyscallFilterSet *set, |
960e4569 | 957 | uint32_t action, |
b54f36c6 ZJS |
958 | char **exclude, |
959 | bool log_missing) { | |
469830d1 | 960 | |
8130926d LP |
961 | const char *sys; |
962 | int r; | |
963 | ||
964 | assert(seccomp); | |
965 | assert(set); | |
966 | ||
967 | NULSTR_FOREACH(sys, set->value) { | |
b54f36c6 | 968 | r = seccomp_add_syscall_filter_item(seccomp, sys, action, exclude, log_missing); |
69b1b241 LP |
969 | if (r < 0) |
970 | return r; | |
469830d1 LP |
971 | } |
972 | ||
973 | return 0; | |
974 | } | |
975 | ||
b54f36c6 | 976 | int seccomp_load_syscall_filter_set(uint32_t default_action, const SyscallFilterSet *set, uint32_t action, bool log_missing) { |
469830d1 LP |
977 | uint32_t arch; |
978 | int r; | |
979 | ||
980 | assert(set); | |
981 | ||
982 | /* The one-stop solution: allocate a seccomp object, add the specified filter to it, and apply it. Once for | |
a90db619 | 983 | * each local arch. */ |
469830d1 LP |
984 | |
985 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { | |
986 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
987 | ||
988 | log_debug("Operating on architecture: %s", seccomp_arch_to_string(arch)); | |
989 | ||
990 | r = seccomp_init_for_arch(&seccomp, arch, default_action); | |
8130926d LP |
991 | if (r < 0) |
992 | return r; | |
469830d1 | 993 | |
b54f36c6 | 994 | r = seccomp_add_syscall_filter_set(seccomp, set, action, NULL, log_missing); |
7e86bd73 ZJS |
995 | if (r < 0) |
996 | return log_debug_errno(r, "Failed to add filter set: %m"); | |
469830d1 LP |
997 | |
998 | r = seccomp_load(seccomp); | |
7bc5e0b1 | 999 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
469830d1 LP |
1000 | return r; |
1001 | if (r < 0) | |
1002 | log_debug_errno(r, "Failed to install filter set for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
8130926d LP |
1003 | } |
1004 | ||
1005 | return 0; | |
1006 | } | |
a3be2849 | 1007 | |
b54f36c6 | 1008 | int seccomp_load_syscall_filter_set_raw(uint32_t default_action, Hashmap* set, uint32_t action, bool log_missing) { |
469830d1 | 1009 | uint32_t arch; |
a3be2849 LP |
1010 | int r; |
1011 | ||
469830d1 LP |
1012 | /* Similar to seccomp_load_syscall_filter_set(), but takes a raw Set* of syscalls, instead of a |
1013 | * SyscallFilterSet* table. */ | |
a3be2849 | 1014 | |
8cfa775f | 1015 | if (hashmap_isempty(set) && default_action == SCMP_ACT_ALLOW) |
469830d1 | 1016 | return 0; |
a3be2849 | 1017 | |
469830d1 LP |
1018 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { |
1019 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
1020 | Iterator i; | |
b54f36c6 | 1021 | void *syscall_id, *val; |
a3be2849 | 1022 | |
469830d1 | 1023 | log_debug("Operating on architecture: %s", seccomp_arch_to_string(arch)); |
a3be2849 | 1024 | |
469830d1 LP |
1025 | r = seccomp_init_for_arch(&seccomp, arch, default_action); |
1026 | if (r < 0) | |
1027 | return r; | |
a3be2849 | 1028 | |
b54f36c6 | 1029 | HASHMAP_FOREACH_KEY(val, syscall_id, set, i) { |
8cfa775f | 1030 | uint32_t a = action; |
b54f36c6 ZJS |
1031 | int id = PTR_TO_INT(syscall_id) - 1; |
1032 | int error = PTR_TO_INT(val); | |
8cfa775f | 1033 | |
b54f36c6 ZJS |
1034 | if (action != SCMP_ACT_ALLOW && error >= 0) |
1035 | a = SCMP_ACT_ERRNO(error); | |
8cfa775f | 1036 | |
b54f36c6 | 1037 | r = seccomp_rule_add_exact(seccomp, a, id, 0); |
469830d1 LP |
1038 | if (r < 0) { |
1039 | /* If the system call is not known on this architecture, then that's fine, let's ignore it */ | |
1040 | _cleanup_free_ char *n = NULL; | |
7e86bd73 | 1041 | bool ignore; |
469830d1 | 1042 | |
b54f36c6 | 1043 | n = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, id); |
7e86bd73 ZJS |
1044 | ignore = r == -EDOM; |
1045 | if (!ignore || log_missing) | |
1046 | log_debug_errno(r, "Failed to add rule for system call %s() / %d%s: %m", | |
1047 | strna(n), id, ignore ? ", ignoring" : ""); | |
1048 | if (!ignore) | |
1049 | return r; | |
469830d1 LP |
1050 | } |
1051 | } | |
1052 | ||
1053 | r = seccomp_load(seccomp); | |
7bc5e0b1 | 1054 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
469830d1 LP |
1055 | return r; |
1056 | if (r < 0) | |
1057 | log_debug_errno(r, "Failed to install filter set for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1058 | } | |
1059 | ||
1060 | return 0; | |
add00535 LP |
1061 | } |
1062 | ||
58f6ab44 | 1063 | int seccomp_parse_syscall_filter( |
898748d8 YW |
1064 | const char *name, |
1065 | int errno_num, | |
1066 | Hashmap *filter, | |
13d92c63 | 1067 | SeccompParseFlags flags, |
898748d8 YW |
1068 | const char *unit, |
1069 | const char *filename, | |
1070 | unsigned line) { | |
1071 | ||
1072 | int r; | |
1073 | ||
1074 | assert(name); | |
1075 | assert(filter); | |
1076 | ||
1077 | if (name[0] == '@') { | |
1078 | const SyscallFilterSet *set; | |
1079 | const char *i; | |
1080 | ||
1081 | set = syscall_filter_set_find(name); | |
1082 | if (!set) { | |
13d92c63 | 1083 | if (!(flags & SECCOMP_PARSE_PERMISSIVE)) |
898748d8 | 1084 | return -EINVAL; |
13d92c63 LP |
1085 | |
1086 | log_syntax(unit, flags & SECCOMP_PARSE_LOG ? LOG_WARNING : LOG_DEBUG, filename, line, 0, | |
1087 | "Unknown system call group, ignoring: %s", name); | |
1088 | return 0; | |
898748d8 YW |
1089 | } |
1090 | ||
1091 | NULSTR_FOREACH(i, set->value) { | |
13d92c63 LP |
1092 | /* Call ourselves again, for the group to parse. Note that we downgrade logging here (i.e. take |
1093 | * away the SECCOMP_PARSE_LOG flag) since any issues in the group table are our own problem, | |
1094 | * not a problem in user configuration data and we shouldn't pretend otherwise by complaining | |
1095 | * about them. */ | |
58f6ab44 | 1096 | r = seccomp_parse_syscall_filter(i, errno_num, filter, flags &~ SECCOMP_PARSE_LOG, unit, filename, line); |
898748d8 YW |
1097 | if (r < 0) |
1098 | return r; | |
1099 | } | |
1100 | } else { | |
1101 | int id; | |
1102 | ||
1103 | id = seccomp_syscall_resolve_name(name); | |
1104 | if (id == __NR_SCMP_ERROR) { | |
13d92c63 | 1105 | if (!(flags & SECCOMP_PARSE_PERMISSIVE)) |
898748d8 | 1106 | return -EINVAL; |
13d92c63 LP |
1107 | |
1108 | log_syntax(unit, flags & SECCOMP_PARSE_LOG ? LOG_WARNING : LOG_DEBUG, filename, line, 0, | |
1109 | "Failed to parse system call, ignoring: %s", name); | |
1110 | return 0; | |
898748d8 YW |
1111 | } |
1112 | ||
1113 | /* If we previously wanted to forbid a syscall and now | |
1114 | * we want to allow it, then remove it from the list. */ | |
6b000af4 | 1115 | if (!(flags & SECCOMP_PARSE_INVERT) == !!(flags & SECCOMP_PARSE_ALLOW_LIST)) { |
898748d8 YW |
1116 | r = hashmap_put(filter, INT_TO_PTR(id + 1), INT_TO_PTR(errno_num)); |
1117 | if (r < 0) | |
851ee70a LW |
1118 | switch (r) { |
1119 | case -ENOMEM: | |
1120 | return flags & SECCOMP_PARSE_LOG ? log_oom() : -ENOMEM; | |
1121 | case -EEXIST: | |
9d7fe7c6 LW |
1122 | assert_se(hashmap_update(filter, INT_TO_PTR(id + 1), INT_TO_PTR(errno_num)) == 0); |
1123 | break; | |
851ee70a LW |
1124 | default: |
1125 | return r; | |
1126 | } | |
898748d8 YW |
1127 | } else |
1128 | (void) hashmap_remove(filter, INT_TO_PTR(id + 1)); | |
1129 | } | |
1130 | ||
1131 | return 0; | |
1132 | } | |
1133 | ||
add00535 | 1134 | int seccomp_restrict_namespaces(unsigned long retain) { |
469830d1 | 1135 | uint32_t arch; |
add00535 LP |
1136 | int r; |
1137 | ||
f1d34068 | 1138 | if (DEBUG_LOGGING) { |
add00535 LP |
1139 | _cleanup_free_ char *s = NULL; |
1140 | ||
86c2a9f1 | 1141 | (void) namespace_flags_to_string(retain, &s); |
add00535 LP |
1142 | log_debug("Restricting namespace to: %s.", strna(s)); |
1143 | } | |
1144 | ||
1145 | /* NOOP? */ | |
1146 | if ((retain & NAMESPACE_FLAGS_ALL) == NAMESPACE_FLAGS_ALL) | |
1147 | return 0; | |
1148 | ||
469830d1 LP |
1149 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { |
1150 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
1151 | unsigned i; | |
add00535 | 1152 | |
469830d1 LP |
1153 | log_debug("Operating on architecture: %s", seccomp_arch_to_string(arch)); |
1154 | ||
1155 | r = seccomp_init_for_arch(&seccomp, arch, SCMP_ACT_ALLOW); | |
1156 | if (r < 0) | |
1157 | return r; | |
1158 | ||
1159 | if ((retain & NAMESPACE_FLAGS_ALL) == 0) | |
1160 | /* If every single kind of namespace shall be prohibited, then let's block the whole setns() syscall | |
1161 | * altogether. */ | |
1162 | r = seccomp_rule_add_exact( | |
1163 | seccomp, | |
1164 | SCMP_ACT_ERRNO(EPERM), | |
1165 | SCMP_SYS(setns), | |
1166 | 0); | |
1167 | else | |
1168 | /* Otherwise, block only the invocations with the appropriate flags in the loop below, but also the | |
1169 | * special invocation with a zero flags argument, right here. */ | |
1170 | r = seccomp_rule_add_exact( | |
1171 | seccomp, | |
1172 | SCMP_ACT_ERRNO(EPERM), | |
1173 | SCMP_SYS(setns), | |
1174 | 1, | |
1175 | SCMP_A1(SCMP_CMP_EQ, 0)); | |
1176 | if (r < 0) { | |
1177 | log_debug_errno(r, "Failed to add setns() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1178 | continue; | |
1179 | } | |
1180 | ||
1181 | for (i = 0; namespace_flag_map[i].name; i++) { | |
1182 | unsigned long f; | |
1183 | ||
1184 | f = namespace_flag_map[i].flag; | |
1185 | if ((retain & f) == f) { | |
1186 | log_debug("Permitting %s.", namespace_flag_map[i].name); | |
1187 | continue; | |
1188 | } | |
1189 | ||
1190 | log_debug("Blocking %s.", namespace_flag_map[i].name); | |
1191 | ||
1192 | r = seccomp_rule_add_exact( | |
1193 | seccomp, | |
1194 | SCMP_ACT_ERRNO(EPERM), | |
1195 | SCMP_SYS(unshare), | |
1196 | 1, | |
1197 | SCMP_A0(SCMP_CMP_MASKED_EQ, f, f)); | |
1198 | if (r < 0) { | |
1199 | log_debug_errno(r, "Failed to add unshare() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1200 | break; | |
1201 | } | |
1202 | ||
511ceb1f ZJS |
1203 | /* On s390/s390x the first two parameters to clone are switched */ |
1204 | if (!IN_SET(arch, SCMP_ARCH_S390, SCMP_ARCH_S390X)) | |
ae9d60ce LP |
1205 | r = seccomp_rule_add_exact( |
1206 | seccomp, | |
1207 | SCMP_ACT_ERRNO(EPERM), | |
1208 | SCMP_SYS(clone), | |
1209 | 1, | |
1210 | SCMP_A0(SCMP_CMP_MASKED_EQ, f, f)); | |
1211 | else | |
1212 | r = seccomp_rule_add_exact( | |
1213 | seccomp, | |
1214 | SCMP_ACT_ERRNO(EPERM), | |
1215 | SCMP_SYS(clone), | |
1216 | 1, | |
1217 | SCMP_A1(SCMP_CMP_MASKED_EQ, f, f)); | |
469830d1 LP |
1218 | if (r < 0) { |
1219 | log_debug_errno(r, "Failed to add clone() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1220 | break; | |
1221 | } | |
1222 | ||
1223 | if ((retain & NAMESPACE_FLAGS_ALL) != 0) { | |
1224 | r = seccomp_rule_add_exact( | |
1225 | seccomp, | |
1226 | SCMP_ACT_ERRNO(EPERM), | |
1227 | SCMP_SYS(setns), | |
1228 | 1, | |
1229 | SCMP_A1(SCMP_CMP_MASKED_EQ, f, f)); | |
1230 | if (r < 0) { | |
1231 | log_debug_errno(r, "Failed to add setns() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1232 | break; | |
1233 | } | |
1234 | } | |
1235 | } | |
1236 | if (r < 0) | |
1237 | continue; | |
1238 | ||
1239 | r = seccomp_load(seccomp); | |
7bc5e0b1 | 1240 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
469830d1 LP |
1241 | return r; |
1242 | if (r < 0) | |
1243 | log_debug_errno(r, "Failed to install namespace restriction rules for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1244 | } | |
1245 | ||
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | int seccomp_protect_sysctl(void) { | |
1250 | uint32_t arch; | |
1251 | int r; | |
1252 | ||
1253 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { | |
1254 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
1255 | ||
1256 | log_debug("Operating on architecture: %s", seccomp_arch_to_string(arch)); | |
1257 | ||
2e64e8f4 ZJS |
1258 | if (IN_SET(arch, SCMP_ARCH_X32, SCMP_ARCH_AARCH64)) |
1259 | /* No _sysctl syscall */ | |
1260 | continue; | |
1261 | ||
469830d1 LP |
1262 | r = seccomp_init_for_arch(&seccomp, arch, SCMP_ACT_ALLOW); |
1263 | if (r < 0) | |
1264 | return r; | |
1265 | ||
1266 | r = seccomp_rule_add_exact( | |
add00535 LP |
1267 | seccomp, |
1268 | SCMP_ACT_ERRNO(EPERM), | |
469830d1 | 1269 | SCMP_SYS(_sysctl), |
add00535 | 1270 | 0); |
469830d1 LP |
1271 | if (r < 0) { |
1272 | log_debug_errno(r, "Failed to add _sysctl() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1273 | continue; | |
1274 | } | |
1275 | ||
1276 | r = seccomp_load(seccomp); | |
7bc5e0b1 | 1277 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
469830d1 LP |
1278 | return r; |
1279 | if (r < 0) | |
1280 | log_debug_errno(r, "Failed to install sysctl protection rules for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1281 | } | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
620dbdd2 KK |
1286 | int seccomp_protect_syslog(void) { |
1287 | uint32_t arch; | |
1288 | int r; | |
1289 | ||
1290 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { | |
1291 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
1292 | ||
1293 | r = seccomp_init_for_arch(&seccomp, arch, SCMP_ACT_ALLOW); | |
1294 | if (r < 0) | |
1295 | return r; | |
1296 | ||
1297 | r = seccomp_rule_add_exact( | |
1298 | seccomp, | |
1299 | SCMP_ACT_ERRNO(EPERM), | |
1300 | SCMP_SYS(syslog), | |
1301 | 0); | |
1302 | ||
1303 | if (r < 0) { | |
1304 | log_debug_errno(r, "Failed to add syslog() rule for architecture %s, skipping %m", seccomp_arch_to_string(arch)); | |
1305 | continue; | |
1306 | } | |
1307 | ||
1308 | r = seccomp_load(seccomp); | |
1309 | if (ERRNO_IS_SECCOMP_FATAL(r)) | |
1310 | return r; | |
1311 | if (r < 0) | |
1312 | log_debug_errno(r, "Failed to install syslog protection rules for architecture %s, skipping %m", seccomp_arch_to_string(arch)); | |
1313 | } | |
1314 | ||
1315 | return 0; | |
1316 | } | |
1317 | ||
6b000af4 | 1318 | int seccomp_restrict_address_families(Set *address_families, bool allow_list) { |
469830d1 LP |
1319 | uint32_t arch; |
1320 | int r; | |
1321 | ||
1322 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { | |
1323 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
9606bc4b | 1324 | bool supported; |
469830d1 LP |
1325 | Iterator i; |
1326 | ||
1327 | log_debug("Operating on architecture: %s", seccomp_arch_to_string(arch)); | |
1328 | ||
9606bc4b LP |
1329 | switch (arch) { |
1330 | ||
1331 | case SCMP_ARCH_X86_64: | |
1332 | case SCMP_ARCH_X32: | |
1333 | case SCMP_ARCH_ARM: | |
1334 | case SCMP_ARCH_AARCH64: | |
0d9fca76 | 1335 | case SCMP_ARCH_PPC: |
da1921a5 ZJS |
1336 | case SCMP_ARCH_PPC64: |
1337 | case SCMP_ARCH_PPC64LE: | |
f5aeac14 JC |
1338 | case SCMP_ARCH_MIPSEL64N32: |
1339 | case SCMP_ARCH_MIPS64N32: | |
1340 | case SCMP_ARCH_MIPSEL64: | |
1341 | case SCMP_ARCH_MIPS64: | |
9606bc4b LP |
1342 | /* These we know we support (i.e. are the ones that do not use socketcall()) */ |
1343 | supported = true; | |
1344 | break; | |
1345 | ||
9606bc4b LP |
1346 | case SCMP_ARCH_S390: |
1347 | case SCMP_ARCH_S390X: | |
da1921a5 | 1348 | case SCMP_ARCH_X86: |
f5aeac14 JC |
1349 | case SCMP_ARCH_MIPSEL: |
1350 | case SCMP_ARCH_MIPS: | |
9606bc4b LP |
1351 | default: |
1352 | /* These we either know we don't support (i.e. are the ones that do use socketcall()), or we | |
1353 | * don't know */ | |
1354 | supported = false; | |
1355 | break; | |
1356 | } | |
1357 | ||
1358 | if (!supported) | |
1359 | continue; | |
1360 | ||
469830d1 LP |
1361 | r = seccomp_init_for_arch(&seccomp, arch, SCMP_ACT_ALLOW); |
1362 | if (r < 0) | |
1363 | return r; | |
1364 | ||
6b000af4 | 1365 | if (allow_list) { |
469830d1 LP |
1366 | int af, first = 0, last = 0; |
1367 | void *afp; | |
1368 | ||
6b000af4 LP |
1369 | /* If this is an allow list, we first block the address families that are out of |
1370 | * range and then everything that is not in the set. First, we find the lowest and | |
1371 | * highest address family in the set. */ | |
469830d1 LP |
1372 | |
1373 | SET_FOREACH(afp, address_families, i) { | |
1374 | af = PTR_TO_INT(afp); | |
1375 | ||
1376 | if (af <= 0 || af >= af_max()) | |
1377 | continue; | |
1378 | ||
1379 | if (first == 0 || af < first) | |
1380 | first = af; | |
1381 | ||
1382 | if (last == 0 || af > last) | |
1383 | last = af; | |
1384 | } | |
1385 | ||
1386 | assert((first == 0) == (last == 0)); | |
1387 | ||
1388 | if (first == 0) { | |
1389 | ||
1390 | /* No entries in the valid range, block everything */ | |
1391 | r = seccomp_rule_add_exact( | |
1392 | seccomp, | |
1393 | SCMP_ACT_ERRNO(EAFNOSUPPORT), | |
1394 | SCMP_SYS(socket), | |
1395 | 0); | |
1396 | if (r < 0) { | |
1397 | log_debug_errno(r, "Failed to add socket() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1398 | continue; | |
1399 | } | |
1400 | ||
1401 | } else { | |
1402 | ||
1403 | /* Block everything below the first entry */ | |
1404 | r = seccomp_rule_add_exact( | |
1405 | seccomp, | |
1406 | SCMP_ACT_ERRNO(EAFNOSUPPORT), | |
1407 | SCMP_SYS(socket), | |
1408 | 1, | |
1409 | SCMP_A0(SCMP_CMP_LT, first)); | |
1410 | if (r < 0) { | |
1411 | log_debug_errno(r, "Failed to add socket() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1412 | continue; | |
1413 | } | |
1414 | ||
1415 | /* Block everything above the last entry */ | |
1416 | r = seccomp_rule_add_exact( | |
1417 | seccomp, | |
1418 | SCMP_ACT_ERRNO(EAFNOSUPPORT), | |
1419 | SCMP_SYS(socket), | |
1420 | 1, | |
1421 | SCMP_A0(SCMP_CMP_GT, last)); | |
1422 | if (r < 0) { | |
1423 | log_debug_errno(r, "Failed to add socket() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1424 | continue; | |
1425 | } | |
1426 | ||
1427 | /* Block everything between the first and last entry */ | |
1428 | for (af = 1; af < af_max(); af++) { | |
1429 | ||
1430 | if (set_contains(address_families, INT_TO_PTR(af))) | |
1431 | continue; | |
1432 | ||
1433 | r = seccomp_rule_add_exact( | |
1434 | seccomp, | |
1435 | SCMP_ACT_ERRNO(EAFNOSUPPORT), | |
1436 | SCMP_SYS(socket), | |
1437 | 1, | |
1438 | SCMP_A0(SCMP_CMP_EQ, af)); | |
1439 | if (r < 0) | |
1440 | break; | |
1441 | } | |
469830d1 LP |
1442 | if (r < 0) { |
1443 | log_debug_errno(r, "Failed to add socket() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1444 | continue; | |
1445 | } | |
1446 | } | |
1447 | ||
1448 | } else { | |
1449 | void *af; | |
1450 | ||
6b000af4 LP |
1451 | /* If this is a deny list, then generate one rule for each address family that are |
1452 | * then combined in OR checks. */ | |
469830d1 LP |
1453 | |
1454 | SET_FOREACH(af, address_families, i) { | |
1455 | ||
1456 | r = seccomp_rule_add_exact( | |
1457 | seccomp, | |
1458 | SCMP_ACT_ERRNO(EAFNOSUPPORT), | |
1459 | SCMP_SYS(socket), | |
1460 | 1, | |
1461 | SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af))); | |
1462 | if (r < 0) | |
1463 | break; | |
1464 | } | |
469830d1 LP |
1465 | if (r < 0) { |
1466 | log_debug_errno(r, "Failed to add socket() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1467 | continue; | |
1468 | } | |
1469 | } | |
1470 | ||
1471 | r = seccomp_load(seccomp); | |
7bc5e0b1 | 1472 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
469830d1 LP |
1473 | return r; |
1474 | if (r < 0) | |
1475 | log_debug_errno(r, "Failed to install socket family rules for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1476 | } | |
1477 | ||
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | int seccomp_restrict_realtime(void) { | |
1482 | static const int permitted_policies[] = { | |
1483 | SCHED_OTHER, | |
1484 | SCHED_BATCH, | |
1485 | SCHED_IDLE, | |
1486 | }; | |
1487 | ||
1488 | int r, max_policy = 0; | |
1489 | uint32_t arch; | |
1490 | unsigned i; | |
1491 | ||
1492 | /* Determine the highest policy constant we want to allow */ | |
1493 | for (i = 0; i < ELEMENTSOF(permitted_policies); i++) | |
1494 | if (permitted_policies[i] > max_policy) | |
1495 | max_policy = permitted_policies[i]; | |
1496 | ||
1497 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { | |
1498 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
1499 | int p; | |
1500 | ||
1501 | log_debug("Operating on architecture: %s", seccomp_arch_to_string(arch)); | |
1502 | ||
1503 | r = seccomp_init_for_arch(&seccomp, arch, SCMP_ACT_ALLOW); | |
1504 | if (r < 0) | |
1505 | return r; | |
1506 | ||
1507 | /* Go through all policies with lower values than that, and block them -- unless they appear in the | |
6b000af4 | 1508 | * allow list. */ |
469830d1 LP |
1509 | for (p = 0; p < max_policy; p++) { |
1510 | bool good = false; | |
1511 | ||
6b000af4 | 1512 | /* Check if this is in the allow list. */ |
469830d1 LP |
1513 | for (i = 0; i < ELEMENTSOF(permitted_policies); i++) |
1514 | if (permitted_policies[i] == p) { | |
1515 | good = true; | |
1516 | break; | |
1517 | } | |
1518 | ||
1519 | if (good) | |
1520 | continue; | |
1521 | ||
1522 | /* Deny this policy */ | |
1523 | r = seccomp_rule_add_exact( | |
1524 | seccomp, | |
1525 | SCMP_ACT_ERRNO(EPERM), | |
1526 | SCMP_SYS(sched_setscheduler), | |
1527 | 1, | |
1528 | SCMP_A1(SCMP_CMP_EQ, p)); | |
1529 | if (r < 0) { | |
1530 | log_debug_errno(r, "Failed to add scheduler rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1531 | continue; | |
1532 | } | |
1533 | } | |
1534 | ||
6b000af4 LP |
1535 | /* Deny-list all other policies, i.e. the ones with higher values. Note that all comparisons |
1536 | * are unsigned here, hence no need no check for < 0 values. */ | |
469830d1 | 1537 | r = seccomp_rule_add_exact( |
add00535 LP |
1538 | seccomp, |
1539 | SCMP_ACT_ERRNO(EPERM), | |
469830d1 | 1540 | SCMP_SYS(sched_setscheduler), |
add00535 | 1541 | 1, |
469830d1 LP |
1542 | SCMP_A1(SCMP_CMP_GT, max_policy)); |
1543 | if (r < 0) { | |
1544 | log_debug_errno(r, "Failed to add scheduler rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1545 | continue; | |
1546 | } | |
add00535 | 1547 | |
469830d1 | 1548 | r = seccomp_load(seccomp); |
7bc5e0b1 | 1549 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
469830d1 LP |
1550 | return r; |
1551 | if (r < 0) | |
1552 | log_debug_errno(r, "Failed to install realtime protection rules for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1553 | } | |
1554 | ||
1555 | return 0; | |
1556 | } | |
1557 | ||
6dc66688 ZJS |
1558 | static int add_seccomp_syscall_filter(scmp_filter_ctx seccomp, |
1559 | uint32_t arch, | |
1560 | int nr, | |
14cb109d | 1561 | unsigned arg_cnt, |
6dc66688 ZJS |
1562 | const struct scmp_arg_cmp arg) { |
1563 | int r; | |
1564 | ||
1565 | r = seccomp_rule_add_exact(seccomp, SCMP_ACT_ERRNO(EPERM), nr, arg_cnt, arg); | |
1566 | if (r < 0) { | |
1567 | _cleanup_free_ char *n = NULL; | |
1568 | ||
1569 | n = seccomp_syscall_resolve_num_arch(arch, nr); | |
1570 | log_debug_errno(r, "Failed to add %s() rule for architecture %s, skipping: %m", | |
1571 | strna(n), | |
1572 | seccomp_arch_to_string(arch)); | |
1573 | } | |
1574 | ||
1575 | return r; | |
1576 | } | |
1577 | ||
2a8d6e63 | 1578 | /* For known architectures, check that syscalls are indeed defined or not. */ |
303d6b4c | 1579 | #if defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) |
2a8d6e63 ZJS |
1580 | assert_cc(SCMP_SYS(shmget) > 0); |
1581 | assert_cc(SCMP_SYS(shmat) > 0); | |
1582 | assert_cc(SCMP_SYS(shmdt) > 0); | |
2a8d6e63 | 1583 | #endif |
6dc66688 | 1584 | |
469830d1 LP |
1585 | int seccomp_memory_deny_write_execute(void) { |
1586 | uint32_t arch; | |
b069c2a3 | 1587 | unsigned loaded = 0; |
469830d1 LP |
1588 | |
1589 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { | |
1590 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
b069c2a3 | 1591 | int filter_syscall = 0, block_syscall = 0, shmat_syscall = 0, r; |
add00535 | 1592 | |
469830d1 LP |
1593 | log_debug("Operating on architecture: %s", seccomp_arch_to_string(arch)); |
1594 | ||
8a50cf69 LP |
1595 | switch (arch) { |
1596 | ||
bed4668d CE |
1597 | /* Note that on some architectures shmat() isn't available, and the call is multiplexed through ipc(). |
1598 | * We ignore that here, which means there's still a way to get writable/executable | |
1599 | * memory, if an IPC key is mapped like this. That's a pity, but no total loss. */ | |
1600 | ||
8a50cf69 | 1601 | case SCMP_ARCH_X86: |
57311925 | 1602 | case SCMP_ARCH_S390: |
8a50cf69 LP |
1603 | filter_syscall = SCMP_SYS(mmap2); |
1604 | block_syscall = SCMP_SYS(mmap); | |
bed4668d | 1605 | /* shmat multiplexed, see above */ |
2a8d6e63 ZJS |
1606 | break; |
1607 | ||
63d00dfb | 1608 | case SCMP_ARCH_PPC: |
2a8d6e63 ZJS |
1609 | case SCMP_ARCH_PPC64: |
1610 | case SCMP_ARCH_PPC64LE: | |
bed4668d | 1611 | case SCMP_ARCH_S390X: |
2a8d6e63 | 1612 | filter_syscall = SCMP_SYS(mmap); |
bed4668d | 1613 | /* shmat multiplexed, see above */ |
8a50cf69 LP |
1614 | break; |
1615 | ||
4278d1f5 ZJS |
1616 | case SCMP_ARCH_ARM: |
1617 | filter_syscall = SCMP_SYS(mmap2); /* arm has only mmap2 */ | |
1618 | shmat_syscall = SCMP_SYS(shmat); | |
1619 | break; | |
1620 | ||
8a50cf69 LP |
1621 | case SCMP_ARCH_X86_64: |
1622 | case SCMP_ARCH_X32: | |
79873bc8 | 1623 | case SCMP_ARCH_AARCH64: |
bed4668d | 1624 | filter_syscall = SCMP_SYS(mmap); /* amd64, x32 and arm64 have only mmap */ |
8a50cf69 LP |
1625 | shmat_syscall = SCMP_SYS(shmat); |
1626 | break; | |
1627 | ||
1628 | /* Please add more definitions here, if you port systemd to other architectures! */ | |
1629 | ||
57311925 | 1630 | #if !defined(__i386__) && !defined(__x86_64__) && !defined(__powerpc__) && !defined(__powerpc64__) && !defined(__arm__) && !defined(__aarch64__) && !defined(__s390__) && !defined(__s390x__) |
8a50cf69 LP |
1631 | #warning "Consider adding the right mmap() syscall definitions here!" |
1632 | #endif | |
1633 | } | |
1634 | ||
1635 | /* Can't filter mmap() on this arch, then skip it */ | |
1636 | if (filter_syscall == 0) | |
1637 | continue; | |
1638 | ||
469830d1 LP |
1639 | r = seccomp_init_for_arch(&seccomp, arch, SCMP_ACT_ALLOW); |
1640 | if (r < 0) | |
1641 | return r; | |
1642 | ||
6dc66688 ZJS |
1643 | r = add_seccomp_syscall_filter(seccomp, arch, filter_syscall, |
1644 | 1, | |
1645 | SCMP_A2(SCMP_CMP_MASKED_EQ, PROT_EXEC|PROT_WRITE, PROT_EXEC|PROT_WRITE)); | |
1646 | if (r < 0) | |
1647 | continue; | |
8a50cf69 LP |
1648 | |
1649 | if (block_syscall != 0) { | |
6dc66688 ZJS |
1650 | r = add_seccomp_syscall_filter(seccomp, arch, block_syscall, 0, (const struct scmp_arg_cmp){} ); |
1651 | if (r < 0) | |
8a50cf69 | 1652 | continue; |
add00535 | 1653 | } |
a3be2849 | 1654 | |
6dc66688 ZJS |
1655 | r = add_seccomp_syscall_filter(seccomp, arch, SCMP_SYS(mprotect), |
1656 | 1, | |
b835eeb4 ZJS |
1657 | SCMP_A2(SCMP_CMP_MASKED_EQ, PROT_EXEC, PROT_EXEC)); |
1658 | if (r < 0) | |
1659 | continue; | |
1660 | ||
91691f1d | 1661 | #ifdef __NR_pkey_mprotect |
b835eeb4 ZJS |
1662 | r = add_seccomp_syscall_filter(seccomp, arch, SCMP_SYS(pkey_mprotect), |
1663 | 1, | |
6dc66688 ZJS |
1664 | SCMP_A2(SCMP_CMP_MASKED_EQ, PROT_EXEC, PROT_EXEC)); |
1665 | if (r < 0) | |
469830d1 | 1666 | continue; |
91691f1d | 1667 | #endif |
add00535 | 1668 | |
67fb5f33 | 1669 | if (shmat_syscall > 0) { |
5ef3ed97 | 1670 | r = add_seccomp_syscall_filter(seccomp, arch, shmat_syscall, |
6dc66688 ZJS |
1671 | 1, |
1672 | SCMP_A2(SCMP_CMP_MASKED_EQ, SHM_EXEC, SHM_EXEC)); | |
1673 | if (r < 0) | |
8a50cf69 | 1674 | continue; |
469830d1 LP |
1675 | } |
1676 | ||
1677 | r = seccomp_load(seccomp); | |
7bc5e0b1 | 1678 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
469830d1 | 1679 | return r; |
add00535 | 1680 | if (r < 0) |
b069c2a3 ZJS |
1681 | log_debug_errno(r, "Failed to install MemoryDenyWriteExecute= rule for architecture %s, skipping: %m", |
1682 | seccomp_arch_to_string(arch)); | |
903659e7 | 1683 | loaded++; |
469830d1 | 1684 | } |
add00535 | 1685 | |
903659e7 | 1686 | if (loaded == 0) |
b069c2a3 | 1687 | log_debug("Failed to install any seccomp rules for MemoryDenyWriteExecute=."); |
903659e7 CE |
1688 | |
1689 | return loaded; | |
469830d1 LP |
1690 | } |
1691 | ||
1692 | int seccomp_restrict_archs(Set *archs) { | |
1693 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
1694 | Iterator i; | |
1695 | void *id; | |
1696 | int r; | |
1697 | ||
1698 | /* This installs a filter with no rules, but that restricts the system call architectures to the specified | |
2428aaf8 AJ |
1699 | * list. |
1700 | * | |
1701 | * There are some qualifications. However the most important use is to stop processes from bypassing | |
1702 | * system call restrictions, in case they used a broader (multiplexing) syscall which is only available | |
1703 | * in a non-native architecture. There are no holes in this use case, at least so far. */ | |
469830d1 | 1704 | |
2428aaf8 AJ |
1705 | /* Note libseccomp includes our "native" (current) architecture in the filter by default. |
1706 | * We do not remove it. For example, our callers expect to be able to call execve() afterwards | |
1707 | * to run a program with the restrictions applied. */ | |
469830d1 LP |
1708 | seccomp = seccomp_init(SCMP_ACT_ALLOW); |
1709 | if (!seccomp) | |
1710 | return -ENOMEM; | |
1711 | ||
1712 | SET_FOREACH(id, archs, i) { | |
1713 | r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); | |
2428aaf8 AJ |
1714 | if (r < 0 && r != -EEXIST) |
1715 | return r; | |
1716 | } | |
1717 | ||
1718 | /* The vdso for x32 assumes that x86-64 syscalls are available. Let's allow them, since x32 | |
1719 | * x32 syscalls should basically match x86-64 for everything except the pointer type. | |
1720 | * The important thing is that you can block the old 32-bit x86 syscalls. | |
1721 | * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850047 */ | |
1722 | ||
1723 | if (seccomp_arch_native() == SCMP_ARCH_X32 || | |
1724 | set_contains(archs, UINT32_TO_PTR(SCMP_ARCH_X32 + 1))) { | |
1725 | ||
1726 | r = seccomp_arch_add(seccomp, SCMP_ARCH_X86_64); | |
1727 | if (r < 0 && r != -EEXIST) | |
469830d1 | 1728 | return r; |
add00535 LP |
1729 | } |
1730 | ||
469830d1 LP |
1731 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); |
1732 | if (r < 0) | |
1733 | return r; | |
add00535 | 1734 | |
1c6af69b | 1735 | r = seccomp_load(seccomp); |
7bc5e0b1 | 1736 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
1c6af69b LP |
1737 | return r; |
1738 | if (r < 0) | |
1739 | log_debug_errno(r, "Failed to restrict system call architectures, skipping: %m"); | |
1740 | ||
1741 | return 0; | |
a3be2849 | 1742 | } |
b16bd535 | 1743 | |
de7fef4b ZJS |
1744 | int parse_syscall_archs(char **l, Set **ret_archs) { |
1745 | _cleanup_set_free_ Set *archs = NULL; | |
b16bd535 YW |
1746 | char **s; |
1747 | int r; | |
1748 | ||
1749 | assert(l); | |
de7fef4b | 1750 | assert(ret_archs); |
b16bd535 YW |
1751 | |
1752 | STRV_FOREACH(s, l) { | |
1753 | uint32_t a; | |
1754 | ||
1755 | r = seccomp_arch_from_string(*s, &a); | |
1756 | if (r < 0) | |
1757 | return -EINVAL; | |
1758 | ||
de7fef4b | 1759 | r = set_ensure_put(&archs, NULL, UINT32_TO_PTR(a + 1)); |
b16bd535 YW |
1760 | if (r < 0) |
1761 | return -ENOMEM; | |
1762 | } | |
1763 | ||
de7fef4b | 1764 | *ret_archs = TAKE_PTR(archs); |
b16bd535 YW |
1765 | return 0; |
1766 | } | |
165a31c0 | 1767 | |
8cfa775f | 1768 | int seccomp_filter_set_add(Hashmap *filter, bool add, const SyscallFilterSet *set) { |
165a31c0 LP |
1769 | const char *i; |
1770 | int r; | |
1771 | ||
1772 | assert(set); | |
1773 | ||
1774 | NULSTR_FOREACH(i, set->value) { | |
1775 | ||
1776 | if (i[0] == '@') { | |
1777 | const SyscallFilterSet *more; | |
1778 | ||
1779 | more = syscall_filter_set_find(i); | |
1780 | if (!more) | |
1781 | return -ENXIO; | |
1782 | ||
165a31c0 LP |
1783 | r = seccomp_filter_set_add(filter, add, more); |
1784 | if (r < 0) | |
1785 | return r; | |
1786 | } else { | |
1787 | int id; | |
1788 | ||
1789 | id = seccomp_syscall_resolve_name(i); | |
ff217dc3 LP |
1790 | if (id == __NR_SCMP_ERROR) { |
1791 | log_debug("Couldn't resolve system call, ignoring: %s", i); | |
1792 | continue; | |
1793 | } | |
165a31c0 LP |
1794 | |
1795 | if (add) { | |
8cfa775f | 1796 | r = hashmap_put(filter, INT_TO_PTR(id + 1), INT_TO_PTR(-1)); |
165a31c0 LP |
1797 | if (r < 0) |
1798 | return r; | |
1799 | } else | |
8cfa775f | 1800 | (void) hashmap_remove(filter, INT_TO_PTR(id + 1)); |
165a31c0 LP |
1801 | } |
1802 | } | |
1803 | ||
1804 | return 0; | |
1805 | } | |
78e864e5 TM |
1806 | |
1807 | int seccomp_lock_personality(unsigned long personality) { | |
72eafe71 | 1808 | uint32_t arch; |
78e864e5 TM |
1809 | int r; |
1810 | ||
72eafe71 LP |
1811 | if (personality >= PERSONALITY_INVALID) |
1812 | return -EINVAL; | |
78e864e5 | 1813 | |
72eafe71 LP |
1814 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { |
1815 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
78e864e5 | 1816 | |
72eafe71 LP |
1817 | r = seccomp_init_for_arch(&seccomp, arch, SCMP_ACT_ALLOW); |
1818 | if (r < 0) | |
1819 | return r; | |
1820 | ||
1821 | r = seccomp_rule_add_exact( | |
1822 | seccomp, | |
1823 | SCMP_ACT_ERRNO(EPERM), | |
1824 | SCMP_SYS(personality), | |
1825 | 1, | |
1826 | SCMP_A0(SCMP_CMP_NE, personality)); | |
448ac526 LP |
1827 | if (r < 0) { |
1828 | log_debug_errno(r, "Failed to add scheduler rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1829 | continue; | |
1830 | } | |
72eafe71 LP |
1831 | |
1832 | r = seccomp_load(seccomp); | |
7bc5e0b1 | 1833 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
72eafe71 LP |
1834 | return r; |
1835 | if (r < 0) | |
1836 | log_debug_errno(r, "Failed to enable personality lock for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1837 | } | |
1838 | ||
1839 | return 0; | |
78e864e5 | 1840 | } |
aecd5ac6 TM |
1841 | |
1842 | int seccomp_protect_hostname(void) { | |
1843 | uint32_t arch; | |
1844 | int r; | |
1845 | ||
1846 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { | |
1847 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
1848 | ||
1849 | r = seccomp_init_for_arch(&seccomp, arch, SCMP_ACT_ALLOW); | |
1850 | if (r < 0) | |
1851 | return r; | |
1852 | ||
1853 | r = seccomp_rule_add_exact( | |
1854 | seccomp, | |
1855 | SCMP_ACT_ERRNO(EPERM), | |
1856 | SCMP_SYS(sethostname), | |
1857 | 0); | |
9e6e543c LP |
1858 | if (r < 0) { |
1859 | log_debug_errno(r, "Failed to add sethostname() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
aecd5ac6 | 1860 | continue; |
9e6e543c | 1861 | } |
aecd5ac6 TM |
1862 | |
1863 | r = seccomp_rule_add_exact( | |
1864 | seccomp, | |
1865 | SCMP_ACT_ERRNO(EPERM), | |
1866 | SCMP_SYS(setdomainname), | |
1867 | 0); | |
9e6e543c LP |
1868 | if (r < 0) { |
1869 | log_debug_errno(r, "Failed to add setdomainname() rule for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
aecd5ac6 | 1870 | continue; |
9e6e543c | 1871 | } |
aecd5ac6 TM |
1872 | |
1873 | r = seccomp_load(seccomp); | |
7bc5e0b1 | 1874 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
aecd5ac6 TM |
1875 | return r; |
1876 | if (r < 0) | |
1877 | log_debug_errno(r, "Failed to apply hostname restrictions for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
1878 | } | |
1879 | ||
1880 | return 0; | |
1881 | } | |
3c27973b | 1882 | |
da4dc9a6 ZJS |
1883 | static int seccomp_restrict_sxid(scmp_filter_ctx seccomp, mode_t m) { |
1884 | /* Checks the mode_t parameter of the following system calls: | |
1885 | * | |
1886 | * → chmod() + fchmod() + fchmodat() | |
1887 | * → open() + creat() + openat() | |
1888 | * → mkdir() + mkdirat() | |
1889 | * → mknod() + mknodat() | |
1890 | * | |
1891 | * Returns error if *everything* failed, and 0 otherwise. | |
1892 | */ | |
1893 | int r = 0; | |
1894 | bool any = false; | |
1895 | ||
1896 | r = seccomp_rule_add_exact( | |
1897 | seccomp, | |
1898 | SCMP_ACT_ERRNO(EPERM), | |
1899 | SCMP_SYS(chmod), | |
1900 | 1, | |
1901 | SCMP_A1(SCMP_CMP_MASKED_EQ, m, m)); | |
1902 | if (r < 0) | |
1903 | log_debug_errno(r, "Failed to add filter for chmod: %m"); | |
1904 | else | |
1905 | any = true; | |
1906 | ||
1907 | r = seccomp_rule_add_exact( | |
1908 | seccomp, | |
1909 | SCMP_ACT_ERRNO(EPERM), | |
1910 | SCMP_SYS(fchmod), | |
1911 | 1, | |
1912 | SCMP_A1(SCMP_CMP_MASKED_EQ, m, m)); | |
1913 | if (r < 0) | |
1914 | log_debug_errno(r, "Failed to add filter for fchmod: %m"); | |
1915 | else | |
1916 | any = true; | |
1917 | ||
1918 | r = seccomp_rule_add_exact( | |
1919 | seccomp, | |
1920 | SCMP_ACT_ERRNO(EPERM), | |
1921 | SCMP_SYS(fchmodat), | |
1922 | 1, | |
1923 | SCMP_A2(SCMP_CMP_MASKED_EQ, m, m)); | |
1924 | if (r < 0) | |
1925 | log_debug_errno(r, "Failed to add filter for fchmodat: %m"); | |
1926 | else | |
1927 | any = true; | |
1928 | ||
1929 | r = seccomp_rule_add_exact( | |
1930 | seccomp, | |
1931 | SCMP_ACT_ERRNO(EPERM), | |
1932 | SCMP_SYS(mkdir), | |
1933 | 1, | |
1934 | SCMP_A1(SCMP_CMP_MASKED_EQ, m, m)); | |
1935 | if (r < 0) | |
1936 | log_debug_errno(r, "Failed to add filter for mkdir: %m"); | |
1937 | else | |
1938 | any = true; | |
1939 | ||
1940 | r = seccomp_rule_add_exact( | |
1941 | seccomp, | |
1942 | SCMP_ACT_ERRNO(EPERM), | |
1943 | SCMP_SYS(mkdirat), | |
1944 | 1, | |
1945 | SCMP_A2(SCMP_CMP_MASKED_EQ, m, m)); | |
1946 | if (r < 0) | |
1947 | log_debug_errno(r, "Failed to add filter for mkdirat: %m"); | |
1948 | else | |
1949 | any = true; | |
1950 | ||
1951 | r = seccomp_rule_add_exact( | |
1952 | seccomp, | |
1953 | SCMP_ACT_ERRNO(EPERM), | |
1954 | SCMP_SYS(mknod), | |
1955 | 1, | |
1956 | SCMP_A1(SCMP_CMP_MASKED_EQ, m, m)); | |
1957 | if (r < 0) | |
1958 | log_debug_errno(r, "Failed to add filter for mknod: %m"); | |
1959 | else | |
1960 | any = true; | |
1961 | ||
1962 | r = seccomp_rule_add_exact( | |
1963 | seccomp, | |
1964 | SCMP_ACT_ERRNO(EPERM), | |
1965 | SCMP_SYS(mknodat), | |
1966 | 1, | |
1967 | SCMP_A2(SCMP_CMP_MASKED_EQ, m, m)); | |
1968 | if (r < 0) | |
1969 | log_debug_errno(r, "Failed to add filter for mknodat: %m"); | |
1970 | else | |
1971 | any = true; | |
1972 | ||
1973 | #if SCMP_SYS(open) > 0 | |
1974 | r = seccomp_rule_add_exact( | |
1975 | seccomp, | |
1976 | SCMP_ACT_ERRNO(EPERM), | |
1977 | SCMP_SYS(open), | |
1978 | 2, | |
1979 | SCMP_A1(SCMP_CMP_MASKED_EQ, O_CREAT, O_CREAT), | |
1980 | SCMP_A2(SCMP_CMP_MASKED_EQ, m, m)); | |
1981 | if (r < 0) | |
1982 | log_debug_errno(r, "Failed to add filter for open: %m"); | |
1983 | else | |
1984 | any = true; | |
1985 | #endif | |
1986 | ||
1987 | r = seccomp_rule_add_exact( | |
1988 | seccomp, | |
1989 | SCMP_ACT_ERRNO(EPERM), | |
1990 | SCMP_SYS(openat), | |
1991 | 2, | |
1992 | SCMP_A2(SCMP_CMP_MASKED_EQ, O_CREAT, O_CREAT), | |
1993 | SCMP_A3(SCMP_CMP_MASKED_EQ, m, m)); | |
1994 | if (r < 0) | |
1995 | log_debug_errno(r, "Failed to add filter for openat: %m"); | |
1996 | else | |
1997 | any = true; | |
1998 | ||
ecc04067 LP |
1999 | #if defined(__SNR_openat2) |
2000 | /* The new openat2() system call can't be filtered sensibly, since it moves the flags parameter into | |
2001 | * an indirect structure. Let's block it entirely for now. That should be a reasonably OK thing to do | |
2002 | * for now, since openat2() is very new and code generally needs fallback logic anyway to be | |
2003 | * compatible with kernels that are not absolutely recent. */ | |
2004 | r = seccomp_rule_add_exact( | |
2005 | seccomp, | |
2006 | SCMP_ACT_ERRNO(EPERM), | |
2007 | SCMP_SYS(openat2), | |
2008 | 0); | |
2009 | if (r < 0) | |
2010 | log_debug_errno(r, "Failed to add filter for openat2: %m"); | |
2011 | else | |
2012 | any = true; | |
2013 | #endif | |
2014 | ||
da4dc9a6 ZJS |
2015 | r = seccomp_rule_add_exact( |
2016 | seccomp, | |
2017 | SCMP_ACT_ERRNO(EPERM), | |
2018 | SCMP_SYS(creat), | |
2019 | 1, | |
2020 | SCMP_A1(SCMP_CMP_MASKED_EQ, m, m)); | |
2021 | if (r < 0) | |
2022 | log_debug_errno(r, "Failed to add filter for creat: %m"); | |
2023 | else | |
2024 | any = true; | |
2025 | ||
2026 | return any ? 0 : r; | |
2027 | } | |
2028 | ||
3c27973b LP |
2029 | int seccomp_restrict_suid_sgid(void) { |
2030 | uint32_t arch; | |
da4dc9a6 | 2031 | int r, k; |
3c27973b LP |
2032 | |
2033 | SECCOMP_FOREACH_LOCAL_ARCH(arch) { | |
2034 | _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL; | |
2035 | ||
2036 | r = seccomp_init_for_arch(&seccomp, arch, SCMP_ACT_ALLOW); | |
2037 | if (r < 0) | |
2038 | return r; | |
2039 | ||
da4dc9a6 ZJS |
2040 | r = seccomp_restrict_sxid(seccomp, S_ISUID); |
2041 | if (r < 0) | |
2042 | log_debug_errno(r, "Failed to add suid rule for architecture %s, ignoring: %m", seccomp_arch_to_string(arch)); | |
3c27973b | 2043 | |
da4dc9a6 ZJS |
2044 | k = seccomp_restrict_sxid(seccomp, S_ISGID); |
2045 | if (k < 0) | |
2046 | log_debug_errno(r, "Failed to add sgid rule for architecture %s, ignoring: %m", seccomp_arch_to_string(arch)); | |
3c27973b | 2047 | |
da4dc9a6 | 2048 | if (r < 0 && k < 0) |
3c27973b | 2049 | continue; |
3c27973b LP |
2050 | |
2051 | r = seccomp_load(seccomp); | |
7bc5e0b1 | 2052 | if (ERRNO_IS_SECCOMP_FATAL(r)) |
3c27973b LP |
2053 | return r; |
2054 | if (r < 0) | |
2055 | log_debug_errno(r, "Failed to apply suid/sgid restrictions for architecture %s, skipping: %m", seccomp_arch_to_string(arch)); | |
2056 | } | |
2057 | ||
2058 | return 0; | |
2059 | } | |
915fb324 LP |
2060 | |
2061 | uint32_t scmp_act_kill_process(void) { | |
2062 | ||
2063 | /* Returns SCMP_ACT_KILL_PROCESS if it's supported, and SCMP_ACT_KILL_THREAD otherwise. We never | |
2064 | * actually want to use SCMP_ACT_KILL_THREAD as its semantics are nuts (killing arbitrary threads of | |
2065 | * a program is just a bad idea), but on old kernels/old libseccomp it is all we have, and at least | |
2066 | * for single-threaded apps does the right thing. */ | |
2067 | ||
2068 | #ifdef SCMP_ACT_KILL_PROCESS | |
2069 | if (seccomp_api_get() >= 3) | |
2070 | return SCMP_ACT_KILL_PROCESS; | |
2071 | #endif | |
2072 | ||
2073 | return SCMP_ACT_KILL; /* same as SCMP_ACT_KILL_THREAD */ | |
2074 | } |