705268414f
Currently we employ mostly system call blacklisting for our system services. Let's add a new system call filter group @system-service that helps turning this around into a whitelist by default. The new group is very similar to nspawn's default filter list, but in some ways more restricted (as sethostname() and suchlike shouldn't be available to most system services just like that) and in others more relaxed (for example @keyring is blocked in nspawn since it's not properly virtualized yet in the kernel, but is fine for regular system services).
99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <seccomp.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "set.h"
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const char* seccomp_arch_to_string(uint32_t c);
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int seccomp_arch_from_string(const char *n, uint32_t *ret);
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int seccomp_init_for_arch(scmp_filter_ctx *ret, uint32_t arch, uint32_t default_action);
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bool is_seccomp_available(void);
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typedef struct SyscallFilterSet {
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const char *name;
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const char *help;
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const char *value;
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} SyscallFilterSet;
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enum {
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/* Please leave DEFAULT first, but sort the rest alphabetically */
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SYSCALL_FILTER_SET_DEFAULT,
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SYSCALL_FILTER_SET_AIO,
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SYSCALL_FILTER_SET_BASIC_IO,
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SYSCALL_FILTER_SET_CHOWN,
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SYSCALL_FILTER_SET_CLOCK,
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SYSCALL_FILTER_SET_CPU_EMULATION,
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SYSCALL_FILTER_SET_DEBUG,
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SYSCALL_FILTER_SET_FILE_SYSTEM,
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SYSCALL_FILTER_SET_IO_EVENT,
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SYSCALL_FILTER_SET_IPC,
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SYSCALL_FILTER_SET_KEYRING,
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SYSCALL_FILTER_SET_MEMLOCK,
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SYSCALL_FILTER_SET_MODULE,
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SYSCALL_FILTER_SET_MOUNT,
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SYSCALL_FILTER_SET_NETWORK_IO,
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SYSCALL_FILTER_SET_OBSOLETE,
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SYSCALL_FILTER_SET_PRIVILEGED,
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SYSCALL_FILTER_SET_PROCESS,
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SYSCALL_FILTER_SET_RAW_IO,
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SYSCALL_FILTER_SET_REBOOT,
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SYSCALL_FILTER_SET_RESOURCES,
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SYSCALL_FILTER_SET_SETUID,
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SYSCALL_FILTER_SET_SIGNAL,
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SYSCALL_FILTER_SET_SWAP,
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SYSCALL_FILTER_SET_SYNC,
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SYSCALL_FILTER_SET_SYSTEM_SERVICE,
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SYSCALL_FILTER_SET_TIMER,
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_SYSCALL_FILTER_SET_MAX
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};
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extern const SyscallFilterSet syscall_filter_sets[];
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const SyscallFilterSet *syscall_filter_set_find(const char *name);
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int seccomp_filter_set_add(Hashmap *s, bool b, const SyscallFilterSet *set);
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int seccomp_add_syscall_filter_item(scmp_filter_ctx *ctx, const char *name, uint32_t action, char **exclude);
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int seccomp_load_syscall_filter_set(uint32_t default_action, const SyscallFilterSet *set, uint32_t action);
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int seccomp_load_syscall_filter_set_raw(uint32_t default_action, Hashmap* set, uint32_t action);
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typedef enum SeccompParseFlags {
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SECCOMP_PARSE_INVERT = 1 << 0,
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SECCOMP_PARSE_WHITELIST = 1 << 1,
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SECCOMP_PARSE_LOG = 1 << 2,
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SECCOMP_PARSE_PERMISSIVE = 1 << 3,
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} SeccompParseFlags;
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int seccomp_parse_syscall_filter_full(
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const char *name, int errno_num, Hashmap *filter, SeccompParseFlags flags,
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const char *unit, const char *filename, unsigned line);
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static inline int seccomp_parse_syscall_filter(const char *name, int errno_num, Hashmap *filter, SeccompParseFlags flags) {
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return seccomp_parse_syscall_filter_full(name, errno_num, filter, flags, NULL, NULL, 0);
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}
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int seccomp_restrict_archs(Set *archs);
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int seccomp_restrict_namespaces(unsigned long retain);
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int seccomp_protect_sysctl(void);
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int seccomp_restrict_address_families(Set *address_families, bool whitelist);
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int seccomp_restrict_realtime(void);
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int seccomp_memory_deny_write_execute(void);
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int seccomp_lock_personality(unsigned long personality);
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extern const uint32_t seccomp_local_archs[];
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#define SECCOMP_FOREACH_LOCAL_ARCH(arch) \
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for (unsigned _i = ({ (arch) = seccomp_local_archs[0]; 0; }); \
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seccomp_local_archs[_i] != (uint32_t) -1; \
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(arch) = seccomp_local_archs[++_i])
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DEFINE_TRIVIAL_CLEANUP_FUNC(scmp_filter_ctx, seccomp_release);
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int parse_syscall_archs(char **l, Set **archs);
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