2 1a49166d 2021-01-23 op * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
4 e29dbd72 2021-01-23 op * Permission to use, copy, modify, and distribute this software for any
5 e29dbd72 2021-01-23 op * purpose with or without fee is hereby granted, provided that the above
6 e29dbd72 2021-01-23 op * copyright notice and this permission notice appear in all copies.
8 e29dbd72 2021-01-23 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 e29dbd72 2021-01-23 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 e29dbd72 2021-01-23 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 e29dbd72 2021-01-23 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 e29dbd72 2021-01-23 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 e29dbd72 2021-01-23 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 e29dbd72 2021-01-23 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 dafb57b8 2021-01-15 op #include "gmid.h"
19 8bb8cf2a 2021-07-02 op #if DISABLE_SANDBOX
21 8bb8cf2a 2021-07-02 op #warning "Sandbox disabled! Please report issues upstream instead of disabling the sandbox."
24 8bb8cf2a 2021-07-02 op sandbox_server_process(void)
30 8bb8cf2a 2021-07-02 op sandbox_executor_process(void)
32 8bb8cf2a 2021-07-02 op log_notice(NULL, "Sandbox disabled! "
33 8bb8cf2a 2021-07-02 op "Please report issues upstream instead of disabling the sandbox.");
37 8bb8cf2a 2021-07-02 op sandbox_logger_process(void)
42 8bb8cf2a 2021-07-02 op #elif defined(__FreeBSD__)
44 dafb57b8 2021-01-15 op #include <sys/capsicum.h>
47 62e001b0 2021-03-20 op sandbox_server_process(void)
49 dafb57b8 2021-01-15 op if (cap_enter() == -1)
50 8e56d6ad 2021-02-11 op fatal("cap_enter");
54 62e001b0 2021-03-20 op sandbox_executor_process(void)
57 a8a1f439 2021-07-07 op * We cannot capsicum the executor process because it needs to
58 a8a1f439 2021-07-07 op * fork(2)+execve(2) cgi scripts
64 62e001b0 2021-03-20 op sandbox_logger_process(void)
66 62e001b0 2021-03-20 op if (cap_enter() == -1)
67 62e001b0 2021-03-20 op fatal("cap_enter");
70 dafb57b8 2021-01-15 op #elif defined(__linux__)
72 71b7eb2f 2021-01-17 op #include <sys/prctl.h>
73 71b7eb2f 2021-01-17 op #include <sys/syscall.h>
74 71b7eb2f 2021-01-17 op #include <sys/syscall.h>
75 71b7eb2f 2021-01-17 op #include <sys/types.h>
77 71b7eb2f 2021-01-17 op #include <linux/audit.h>
78 71b7eb2f 2021-01-17 op #include <linux/filter.h>
79 71b7eb2f 2021-01-17 op #include <linux/seccomp.h>
81 71b7eb2f 2021-01-17 op #include <errno.h>
82 3c0375e4 2021-01-20 op #include <fcntl.h>
83 71b7eb2f 2021-01-17 op #include <stddef.h>
84 71b7eb2f 2021-01-17 op #include <stdio.h>
85 71b7eb2f 2021-01-17 op #include <string.h>
87 137def5f 2021-07-02 op /* uncomment to enable debugging. ONLY FOR DEVELOPMENT */
88 137def5f 2021-07-02 op /* #define SC_DEBUG */
90 137def5f 2021-07-02 op #ifdef SC_DEBUG
91 137def5f 2021-07-02 op # define SC_FAIL SECCOMP_RET_TRAP
93 137def5f 2021-07-02 op # define SC_FAIL SECCOMP_RET_KILL
96 137def5f 2021-07-02 op #if (BYTE_ORDER == LITTLE_ENDIAN)
97 137def5f 2021-07-02 op # define SC_ARG_LO 0
98 137def5f 2021-07-02 op # define SC_ARG_HI sizeof(uint32_t)
99 137def5f 2021-07-02 op #elif (BYTE_ORDER == BIG_ENDIAN)
100 137def5f 2021-07-02 op # define SC_ARG_LO sizeof(uint32_t)
101 137def5f 2021-07-02 op # define SC_ARG_HI 0
103 137def5f 2021-07-02 op # error "Uknown endian"
106 137def5f 2021-07-02 op /* make the filter more readable */
107 137def5f 2021-07-02 op #define SC_ALLOW(nr) \
108 137def5f 2021-07-02 op BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, __NR_##nr, 0, 1), \
109 137def5f 2021-07-02 op BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW)
112 137def5f 2021-07-02 op * SC_ALLOW_ARG and the SECCOMP_AUDIT_ARCH below are courtesy of
113 137def5f 2021-07-02 op * https://roy.marples.name/git/dhcpcd/blob/HEAD:/src/privsep-linux.c
115 137def5f 2021-07-02 op #define SC_ALLOW_ARG(_nr, _arg, _val) \
116 137def5f 2021-07-02 op BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, (_nr), 0, 6), \
117 137def5f 2021-07-02 op BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \
118 137def5f 2021-07-02 op offsetof(struct seccomp_data, args[(_arg)]) + SC_ARG_LO), \
119 137def5f 2021-07-02 op BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, \
120 137def5f 2021-07-02 op ((_val) & 0xffffffff), 0, 3), \
121 137def5f 2021-07-02 op BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \
122 137def5f 2021-07-02 op offsetof(struct seccomp_data, args[(_arg)]) + SC_ARG_HI), \
123 137def5f 2021-07-02 op BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, \
124 137def5f 2021-07-02 op (((uint32_t)((uint64_t)(_val) >> 32)) & 0xffffffff), 0, 1), \
125 137def5f 2021-07-02 op BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ALLOW), \
126 137def5f 2021-07-02 op BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \
127 137def5f 2021-07-02 op offsetof(struct seccomp_data, nr))
130 137def5f 2021-07-02 op * I personally find this quite nutty. Why can a system header not
131 137def5f 2021-07-02 op * define a default for this?
133 71b7eb2f 2021-01-17 op #if defined(__i386__)
134 71b7eb2f 2021-01-17 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_I386
135 71b7eb2f 2021-01-17 op #elif defined(__x86_64__)
136 71b7eb2f 2021-01-17 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_X86_64
137 137def5f 2021-07-02 op #elif defined(__arc__)
138 137def5f 2021-07-02 op # if defined(__A7__)
139 137def5f 2021-07-02 op # if (BYTE_ORDER == LITTLE_ENDIAN)
140 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCOMPACT
142 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCOMPACTBE
144 137def5f 2021-07-02 op # elif defined(__HS__)
145 137def5f 2021-07-02 op # if (BYTE_ORDER == LITTLE_ENDIAN)
146 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCV2
148 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCV2BE
151 137def5f 2021-07-02 op # error "Platform does not support seccomp filter yet"
153 71b7eb2f 2021-01-17 op #elif defined(__arm__)
154 137def5f 2021-07-02 op # ifndef EM_ARM
155 137def5f 2021-07-02 op # define EM_ARM 40
157 137def5f 2021-07-02 op # if (BYTE_ORDER == LITTLE_ENDIAN)
158 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARM
160 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARMEB
162 71b7eb2f 2021-01-17 op #elif defined(__aarch64__)
163 71b7eb2f 2021-01-17 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_AARCH64
164 137def5f 2021-07-02 op #elif defined(__alpha__)
165 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ALPHA
166 137def5f 2021-07-02 op #elif defined(__hppa__)
167 137def5f 2021-07-02 op # if defined(__LP64__)
168 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PARISC64
170 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PARISC
172 137def5f 2021-07-02 op #elif defined(__ia64__)
173 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_IA64
174 137def5f 2021-07-02 op #elif defined(__microblaze__)
175 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MICROBLAZE
176 137def5f 2021-07-02 op #elif defined(__m68k__)
177 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_M68K
178 71b7eb2f 2021-01-17 op #elif defined(__mips__)
179 137def5f 2021-07-02 op # if defined(__MIPSEL__)
180 137def5f 2021-07-02 op # if defined(__LP64__)
181 71b7eb2f 2021-01-17 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPSEL64
183 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPSEL
185 137def5f 2021-07-02 op # elif defined(__LP64__)
186 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPS64
188 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPS
190 137def5f 2021-07-02 op #elif defined(__nds32__)
191 137def5f 2021-07-02 op # if (BYTE_ORDER == LITTLE_ENDIAN)
192 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_NDS32
194 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_NDS32BE
196 137def5f 2021-07-02 op #elif defined(__nios2__)
197 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_NIOS2
198 137def5f 2021-07-02 op #elif defined(__or1k__)
199 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_OPENRISC
200 137def5f 2021-07-02 op #elif defined(__powerpc64__)
201 b24021d4 2021-07-03 op # if (BYTE_ORDER == LITTLE_ENDIAN)
202 b24021d4 2021-07-03 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC64LE
204 b24021d4 2021-07-03 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC64
206 137def5f 2021-07-02 op #elif defined(__powerpc__)
207 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC
208 137def5f 2021-07-02 op #elif defined(__riscv)
209 137def5f 2021-07-02 op # if defined(__LP64__)
210 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_RISCV64
212 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_RISCV32
214 137def5f 2021-07-02 op #elif defined(__s390x__)
215 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_S390X
216 137def5f 2021-07-02 op #elif defined(__s390__)
217 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_S390
218 137def5f 2021-07-02 op #elif defined(__sh__)
219 137def5f 2021-07-02 op # if defined(__LP64__)
220 137def5f 2021-07-02 op # if (BYTE_ORDER == LITTLE_ENDIAN)
221 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SHEL64
223 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SH64
226 137def5f 2021-07-02 op # if (BYTE_ORDER == LITTLE_ENDIAN)
227 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SHEL
229 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SH
232 137def5f 2021-07-02 op #elif defined(__sparc__)
233 137def5f 2021-07-02 op # if defined(__arch64__)
234 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SPARC64
236 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SPARC
238 137def5f 2021-07-02 op #elif defined(__xtensa__)
239 137def5f 2021-07-02 op # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_XTENSA
241 71b7eb2f 2021-01-17 op # error "Platform does not support seccomp filter yet"
244 137def5f 2021-07-02 op static struct sock_filter filter[] = {
245 137def5f 2021-07-02 op /* load the *current* architecture */
246 137def5f 2021-07-02 op BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
247 137def5f 2021-07-02 op (offsetof(struct seccomp_data, arch))),
248 137def5f 2021-07-02 op /* ensure it's the same that we've been compiled on */
249 137def5f 2021-07-02 op BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K,
250 137def5f 2021-07-02 op SECCOMP_AUDIT_ARCH, 1, 0),
251 137def5f 2021-07-02 op /* if not, kill the program */
252 137def5f 2021-07-02 op BPF_STMT(BPF_RET | BPF_K, SC_FAIL),
254 137def5f 2021-07-02 op /* load the syscall number */
255 137def5f 2021-07-02 op BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
256 137def5f 2021-07-02 op (offsetof(struct seccomp_data, nr))),
258 137def5f 2021-07-02 op #ifdef __NR_accept
259 137def5f 2021-07-02 op SC_ALLOW(accept),
261 137def5f 2021-07-02 op #ifdef __NR_accept4
262 137def5f 2021-07-02 op SC_ALLOW(accept4),
264 137def5f 2021-07-02 op #ifdef __NR_brk
265 137def5f 2021-07-02 op SC_ALLOW(brk),
267 137def5f 2021-07-02 op #ifdef __NR_clock_gettime
268 137def5f 2021-07-02 op SC_ALLOW(clock_gettime),
270 137def5f 2021-07-02 op #if defined(__x86_64__) && defined(__ILP32__) && defined(__X32_SYSCALL_BIT)
271 137def5f 2021-07-02 op SECCOMP_ALLOW(__NR_clock_gettime & ~__X32_SYSCALL_BIT),
273 137def5f 2021-07-02 op #ifdef __NR_clock_gettime64
274 137def5f 2021-07-02 op SC_ALLOW(clock_gettime64),
276 137def5f 2021-07-02 op #ifdef __NR_close
277 137def5f 2021-07-02 op SC_ALLOW(close),
279 137def5f 2021-07-02 op #ifdef __NR_epoll_ctl
280 137def5f 2021-07-02 op SC_ALLOW(epoll_ctl),
282 137def5f 2021-07-02 op #ifdef __NR_epoll_pwait
283 137def5f 2021-07-02 op SC_ALLOW(epoll_pwait),
285 137def5f 2021-07-02 op #ifdef __NR_epoll_wait
286 137def5f 2021-07-02 op SC_ALLOW(epoll_wait),
288 137def5f 2021-07-02 op #ifdef __NR_exit
289 137def5f 2021-07-02 op SC_ALLOW(exit),
291 137def5f 2021-07-02 op #ifdef __NR_exit_group
292 137def5f 2021-07-02 op SC_ALLOW(exit_group),
294 137def5f 2021-07-02 op #ifdef __NR_fcntl
295 137def5f 2021-07-02 op SC_ALLOW(fcntl),
297 137def5f 2021-07-02 op #ifdef __NR_fcntl64
298 137def5f 2021-07-02 op SC_ALLOW(fcntl64),
300 137def5f 2021-07-02 op #ifdef __NR_fstat
301 137def5f 2021-07-02 op SC_ALLOW(fstat),
303 137def5f 2021-07-02 op #ifdef __NR_getdents64
304 137def5f 2021-07-02 op SC_ALLOW(getdents64),
306 137def5f 2021-07-02 op #ifdef __NR_getpid
307 137def5f 2021-07-02 op SC_ALLOW(getpid),
309 137def5f 2021-07-02 op #ifdef __NR_getrandom
310 137def5f 2021-07-02 op SC_ALLOW(getrandom),
312 137def5f 2021-07-02 op #ifdef __NR_gettimeofday
313 137def5f 2021-07-02 op SC_ALLOW(gettimeofday),
315 137def5f 2021-07-02 op #ifdef __NR_ioctl
316 137def5f 2021-07-02 op /* allow ioctl only on fd 1, glibc doing stuff? */
317 137def5f 2021-07-02 op SC_ALLOW_ARG(__NR_ioctl, 0, 1),
319 137def5f 2021-07-02 op #ifdef __NR_lseek
320 137def5f 2021-07-02 op SC_ALLOW(lseek),
322 137def5f 2021-07-02 op #ifdef __NR_madvise
323 137def5f 2021-07-02 op SC_ALLOW(madvise),
325 137def5f 2021-07-02 op #ifdef __NR_mmap
326 137def5f 2021-07-02 op SC_ALLOW(mmap),
328 137def5f 2021-07-02 op #ifdef __NR_mmap2
329 137def5f 2021-07-02 op SC_ALLOW(mmap2),
331 137def5f 2021-07-02 op #ifdef __NR_munmap
332 137def5f 2021-07-02 op SC_ALLOW(munmap),
334 137def5f 2021-07-02 op #ifdef __NR_newfstatat
335 137def5f 2021-07-02 op SC_ALLOW(newfstatat),
337 137def5f 2021-07-02 op #ifdef __NR_oldfstat
338 137def5f 2021-07-02 op SC_ALLOW(oldfstat),
340 137def5f 2021-07-02 op #ifdef __NR_openat
341 137def5f 2021-07-02 op SC_ALLOW(openat),
343 137def5f 2021-07-02 op #ifdef __NR_prlimit64
344 137def5f 2021-07-02 op SC_ALLOW(prlimit64),
346 137def5f 2021-07-02 op #ifdef __NR_read
347 137def5f 2021-07-02 op SC_ALLOW(read),
349 137def5f 2021-07-02 op #ifdef __NR_recvmsg
350 137def5f 2021-07-02 op SC_ALLOW(recvmsg),
352 137def5f 2021-07-02 op #ifdef __NR_redav
353 137def5f 2021-07-02 op SC_ALLOW(redav),
355 137def5f 2021-07-02 op #ifdef __NR_rt_sigaction
356 137def5f 2021-07-02 op SC_ALLOW(rt_sigaction),
358 137def5f 2021-07-02 op #ifdef __NR_rt_sigreturn
359 137def5f 2021-07-02 op SC_ALLOW(rt_sigreturn),
361 137def5f 2021-07-02 op #ifdef __NR_sendmsg
362 137def5f 2021-07-02 op SC_ALLOW(sendmsg),
364 137def5f 2021-07-02 op #ifdef __NR_statx
365 137def5f 2021-07-02 op SC_ALLOW(statx),
367 137def5f 2021-07-02 op #ifdef __NR_write
368 137def5f 2021-07-02 op SC_ALLOW(write),
370 137def5f 2021-07-02 op #ifdef __NR_writev
371 137def5f 2021-07-02 op SC_ALLOW(writev),
374 4aa1dd55 2021-07-03 op /* disallow everything else */
375 137def5f 2021-07-02 op BPF_STMT(BPF_RET | BPF_K, SC_FAIL),
378 71b7eb2f 2021-01-17 op #ifdef SC_DEBUG
380 71b7eb2f 2021-01-17 op #include <signal.h>
381 71b7eb2f 2021-01-17 op #include <unistd.h>
384 71b7eb2f 2021-01-17 op sandbox_seccomp_violation(int signum, siginfo_t *info, void *ctx)
386 71b7eb2f 2021-01-17 op (void)signum;
389 71b7eb2f 2021-01-17 op fprintf(stderr, "%s: unexpected system call (arch:0x%x,syscall:%d @ %p)\n",
390 71b7eb2f 2021-01-17 op __func__, info->si_arch, info->si_syscall, info->si_call_addr);
395 71b7eb2f 2021-01-17 op sandbox_seccomp_catch_sigsys(void)
397 71b7eb2f 2021-01-17 op struct sigaction act;
398 71b7eb2f 2021-01-17 op sigset_t mask;
400 71b7eb2f 2021-01-17 op memset(&act, 0, sizeof(act));
401 71b7eb2f 2021-01-17 op sigemptyset(&mask);
402 71b7eb2f 2021-01-17 op sigaddset(&mask, SIGSYS);
404 71b7eb2f 2021-01-17 op act.sa_sigaction = &sandbox_seccomp_violation;
405 71b7eb2f 2021-01-17 op act.sa_flags = SA_SIGINFO;
406 8e56d6ad 2021-02-11 op if (sigaction(SIGSYS, &act, NULL) == -1)
407 8e56d6ad 2021-02-11 op fatal("%s: sigaction(SIGSYS): %s",
408 71b7eb2f 2021-01-17 op __func__, strerror(errno));
410 8e56d6ad 2021-02-11 op if (sigprocmask(SIG_UNBLOCK, &mask, NULL) == -1)
411 8e56d6ad 2021-02-11 op fatal("%s: sigprocmask(SIGSYS): %s\n",
412 71b7eb2f 2021-01-17 op __func__, strerror(errno));
414 71b7eb2f 2021-01-17 op #endif /* SC_DEBUG */
417 62e001b0 2021-03-20 op sandbox_server_process(void)
419 71b7eb2f 2021-01-17 op struct sock_fprog prog = {
420 71b7eb2f 2021-01-17 op .len = (unsigned short) (sizeof(filter) / sizeof(filter[0])),
421 71b7eb2f 2021-01-17 op .filter = filter,
424 71b7eb2f 2021-01-17 op #ifdef SC_DEBUG
425 71b7eb2f 2021-01-17 op sandbox_seccomp_catch_sigsys();
428 8e56d6ad 2021-02-11 op if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1)
429 8e56d6ad 2021-02-11 op fatal("%s: prctl(PR_SET_NO_NEW_PRIVS): %s",
430 71b7eb2f 2021-01-17 op __func__, strerror(errno));
432 8e56d6ad 2021-02-11 op if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog) == -1)
433 8e56d6ad 2021-02-11 op fatal("%s: prctl(PR_SET_SECCOMP): %s\n",
434 71b7eb2f 2021-01-17 op __func__, strerror(errno));
438 62e001b0 2021-03-20 op sandbox_executor_process(void)
441 a8a1f439 2021-07-07 op * We cannot use seccomp for the executor process because we
442 62e001b0 2021-03-20 op * don't know what the child will do. Also, our filter will
443 62e001b0 2021-03-20 op * be inherited so the child cannot set its own seccomp
450 62e001b0 2021-03-20 op sandbox_logger_process(void)
453 a8a1f439 2021-07-07 op * To be honest, here we could use a seccomp policy to only
454 a8a1f439 2021-07-07 op * allow writev(2) and memory allocations.
459 dafb57b8 2021-01-15 op #elif defined(__OpenBSD__)
461 dafb57b8 2021-01-15 op #include <unistd.h>
464 62e001b0 2021-03-20 op sandbox_server_process(void)
466 fdea6aa0 2021-04-30 op struct vhost *h;
467 fdea6aa0 2021-04-30 op struct location *l;
469 b8e64ccd 2021-03-31 op TAILQ_FOREACH(h, &hosts, vhosts) {
470 fdea6aa0 2021-04-30 op TAILQ_FOREACH(l, &h->locations, locations) {
471 fdea6aa0 2021-04-30 op if (l->dir == NULL)
474 fdea6aa0 2021-04-30 op if (unveil(l->dir, "r") == -1)
475 fdea6aa0 2021-04-30 op fatal("unveil %s for domain %s",
481 881a9dd9 2021-01-16 op if (pledge("stdio recvfd rpath inet", NULL) == -1)
482 8e56d6ad 2021-02-11 op fatal("pledge");
486 62e001b0 2021-03-20 op sandbox_executor_process(void)
488 b8e64ccd 2021-03-31 op struct vhost *h;
489 fdea6aa0 2021-04-30 op struct location *l;
490 8ad1c570 2021-05-09 op struct fcgi *f;
493 b8e64ccd 2021-03-31 op TAILQ_FOREACH(h, &hosts, vhosts) {
494 fdea6aa0 2021-04-30 op TAILQ_FOREACH(l, &h->locations, locations) {
495 fdea6aa0 2021-04-30 op if (l->dir == NULL)
498 a5d822e5 2021-07-09 op /* r so we can chdir into the directory */
499 fdea6aa0 2021-04-30 op if (unveil(l->dir, "rx") == -1)
500 fdea6aa0 2021-04-30 op fatal("unveil %s for domain %s",
501 fdea6aa0 2021-04-30 op l->dir, h->domain);
505 8ad1c570 2021-05-09 op for (i = 0; i < FCGI_MAX; i++) {
506 8ad1c570 2021-05-09 op f = &fcgi[i];
507 8ad1c570 2021-05-09 op if (f->path != NULL) {
508 8ad1c570 2021-05-09 op if (unveil(f->path, "rw") == -1)
509 8ad1c570 2021-05-09 op fatal("unveil %s", f->path);
512 8ad1c570 2021-05-09 op if (f->prog != NULL) {
513 8ad1c570 2021-05-09 op if (unveil(f->prog, "rx") == -1)
514 8ad1c570 2021-05-09 op fatal("unveil %s", f->prog);
519 8ad1c570 2021-05-09 op * rpath: to chdir into the correct directory
520 8ad1c570 2021-05-09 op * proc exec: CGI
521 8ad1c570 2021-05-09 op * dns inet unix: FastCGI
523 8ad1c570 2021-05-09 op if (pledge("stdio rpath sendfd proc exec dns inet unix", NULL))
524 62e001b0 2021-03-20 op err(1, "pledge");
528 62e001b0 2021-03-20 op sandbox_logger_process(void)
530 e952c505 2021-06-15 op if (pledge("stdio recvfd", NULL) == -1)
531 62e001b0 2021-03-20 op err(1, "pledge");
536 62e001b0 2021-03-20 op #warning "No sandbox method known for this OS"
539 62e001b0 2021-03-20 op sandbox_server_process(void)
545 62e001b0 2021-03-20 op sandbox_executor_process(void)
547 2a911637 2021-02-11 op log_notice(NULL, "no sandbox method known for this OS");
551 62e001b0 2021-03-20 op sandbox_logger_process(void)