151 lines
5.1 KiB
C
151 lines
5.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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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 "errno-list.h"
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#include "parse-util.h"
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#include "set.h"
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#include "string-util.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 and KNOWN last, 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_PKEY,
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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_KNOWN,
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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(
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scmp_filter_ctx *ctx,
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const char *name,
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uint32_t action,
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char **exclude,
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bool log_missing,
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char ***added);
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int seccomp_load_syscall_filter_set(uint32_t default_action, const SyscallFilterSet *set, uint32_t action, bool log_missing);
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int seccomp_load_syscall_filter_set_raw(uint32_t default_action, Hashmap* set, uint32_t action, bool log_missing);
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typedef enum SeccompParseFlags {
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SECCOMP_PARSE_INVERT = 1 << 0,
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SECCOMP_PARSE_ALLOW_LIST = 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(
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const char *name,
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int errno_num,
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Hashmap *filter,
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SeccompParseFlags flags,
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const char *unit,
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const char *filename, unsigned line);
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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_protect_syslog(void);
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int seccomp_restrict_address_families(Set *address_families, bool allow_list);
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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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int seccomp_protect_hostname(void);
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int seccomp_restrict_suid_sgid(void);
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extern uint32_t seccomp_local_archs[];
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#define SECCOMP_LOCAL_ARCH_END UINT32_MAX
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/* Note: 0 is safe to use here because although SCMP_ARCH_NATIVE is 0, it would
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* never be in the seccomp_local_archs array anyway so we can use it as a
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* marker. */
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#define SECCOMP_LOCAL_ARCH_BLOCKED 0
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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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(arch) != SECCOMP_LOCAL_ARCH_END; \
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(arch) = seccomp_local_archs[++_i]) \
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if ((arch) != SECCOMP_LOCAL_ARCH_BLOCKED)
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/* EACCES: does not have the CAP_SYS_ADMIN or no_new_privs == 1
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* ENOMEM: out of memory, failed to allocate space for a libseccomp structure, or would exceed a defined constant
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* EFAULT: addresses passed as args (by libseccomp) are invalid */
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#define ERRNO_IS_SECCOMP_FATAL(r) \
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IN_SET(abs(r), EPERM, EACCES, ENOMEM, EFAULT)
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DEFINE_TRIVIAL_CLEANUP_FUNC(scmp_filter_ctx, seccomp_release);
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int parse_syscall_archs(char **l, Set **ret_archs);
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uint32_t scmp_act_kill_process(void);
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/* This is a special value to be used where syscall filters otherwise expect errno numbers, will be
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replaced with real seccomp action. */
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enum {
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SECCOMP_ERROR_NUMBER_KILL = INT_MAX - 1,
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};
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static inline bool seccomp_errno_or_action_is_valid(int n) {
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return n == SECCOMP_ERROR_NUMBER_KILL || errno_is_valid(n);
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}
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static inline int seccomp_parse_errno_or_action(const char *p) {
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if (streq_ptr(p, "kill"))
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return SECCOMP_ERROR_NUMBER_KILL;
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return parse_errno(p);
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}
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static inline const char *seccomp_errno_or_action_to_string(int num) {
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if (num == SECCOMP_ERROR_NUMBER_KILL)
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return "kill";
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return errno_to_name(num);
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}
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