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core: expose SUID/SGID restriction as new unit setting RestrictSUIDSGID=

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This commit is contained in:
Lennart Poettering 2019-03-20 19:09:09 +01:00
parent 167fc10cb3
commit f69567cbe2
6 changed files with 36 additions and 6 deletions
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4
src/core/dbus-execute.c
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@ -771,6 +771,7 @@ const sd_bus_vtable bus_exec_vtable[] = {
SD_BUS_PROPERTY("ConfigurationDirectory", "as", NULL, offsetof(ExecContext, directories[EXEC_DIRECTORY_CONFIGURATION].paths), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("MemoryDenyWriteExecute", "b", bus_property_get_bool, offsetof(ExecContext, memory_deny_write_execute), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RestrictRealtime", "b", bus_property_get_bool, offsetof(ExecContext, restrict_realtime), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RestrictSUIDSGID", "b", bus_property_get_bool, offsetof(ExecContext, restrict_suid_sgid), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RestrictNamespaces", "t", bus_property_get_ulong, offsetof(ExecContext, restrict_namespaces), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("BindPaths", "a(ssbt)", property_get_bind_paths, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("BindReadOnlyPaths", "a(ssbt)", property_get_bind_paths, 0, SD_BUS_VTABLE_PROPERTY_CONST),
@ -1128,6 +1129,9 @@ int bus_exec_context_set_transient_property(
if (streq(name, "RestrictRealtime"))
return bus_set_transient_bool(u, name, &c->restrict_realtime, message, flags, error);
if (streq(name, "RestrictSUIDSGID"))
return bus_set_transient_bool(u, name, &c->restrict_suid_sgid, message, flags, error);
if (streq(name, "DynamicUser"))
return bus_set_transient_bool(u, name, &c->dynamic_user, message, flags, error);

22
src/core/execute.c
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@ -1404,6 +1404,7 @@ static bool context_has_no_new_privileges(const ExecContext *c) {
return context_has_address_families(c) ||
c->memory_deny_write_execute ||
c->restrict_realtime ||
c->restrict_suid_sgid ||
exec_context_restrict_namespaces_set(c) ||
c->protect_kernel_tunables ||
c->protect_kernel_modules ||
@ -1509,6 +1510,19 @@ static int apply_restrict_realtime(const Unit* u, const ExecContext *c) {
return seccomp_restrict_realtime();
}
static int apply_restrict_suid_sgid(const Unit* u, const ExecContext *c) {
assert(u);
assert(c);
if (!c->restrict_suid_sgid)
return 0;
if (skip_seccomp_unavailable(u, "RestrictSUIDSGID="))
return 0;
return seccomp_restrict_suid_sgid();
}
static int apply_protect_sysctl(const Unit *u, const ExecContext *c) {
assert(u);
assert(c);
@ -3567,6 +3581,12 @@ static int exec_child(
return log_unit_error_errno(unit, r, "Failed to apply realtime restrictions: %m");
}
r = apply_restrict_suid_sgid(unit, context);
if (r < 0) {
*exit_status = EXIT_SECCOMP;
return log_unit_error_errno(unit, r, "Failed to apply SUID/SGID restrictions: %m");
}
r = apply_restrict_namespaces(unit, context);
if (r < 0) {
*exit_status = EXIT_SECCOMP;
@ -4218,6 +4238,7 @@ void exec_context_dump(const ExecContext *c, FILE* f, const char *prefix) {
"%sIgnoreSIGPIPE: %s\n"
"%sMemoryDenyWriteExecute: %s\n"
"%sRestrictRealtime: %s\n"
"%sRestrictSUIDSGID: %s\n"
"%sKeyringMode: %s\n"
"%sProtectHostname: %s\n",
prefix, c->umask,
@ -4237,6 +4258,7 @@ void exec_context_dump(const ExecContext *c, FILE* f, const char *prefix) {
prefix, yes_no(c->ignore_sigpipe),
prefix, yes_no(c->memory_deny_write_execute),
prefix, yes_no(c->restrict_realtime),
prefix, yes_no(c->restrict_suid_sgid),
prefix, exec_keyring_mode_to_string(c->keyring_mode),
prefix, yes_no(c->protect_hostname));

1
src/core/execute.h
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@ -261,6 +261,7 @@ struct ExecContext {
bool memory_deny_write_execute;
bool restrict_realtime;
bool restrict_suid_sgid;
bool lock_personality;
unsigned long personality;

2
src/core/load-fragment-gperf.gperf.m4
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@ -74,6 +74,7 @@ $1.SystemCallErrorNumber, config_parse_syscall_errno, 0,
$1.MemoryDenyWriteExecute, config_parse_bool, 0, offsetof($1, exec_context.memory_deny_write_execute)
$1.RestrictNamespaces, config_parse_restrict_namespaces, 0, offsetof($1, exec_context)
$1.RestrictRealtime, config_parse_bool, 0, offsetof($1, exec_context.restrict_realtime)
$1.RestrictSUIDSGID, config_parse_bool, 0, offsetof($1, exec_context.restrict_suid_sgid)
$1.RestrictAddressFamilies, config_parse_address_families, 0, offsetof($1, exec_context)
$1.LockPersonality, config_parse_bool, 0, offsetof($1, exec_context.lock_personality)',
`$1.SystemCallFilter, config_parse_warn_compat, DISABLED_CONFIGURATION, 0
@ -82,6 +83,7 @@ $1.SystemCallErrorNumber, config_parse_warn_compat, DISABLED_CO
$1.MemoryDenyWriteExecute, config_parse_warn_compat, DISABLED_CONFIGURATION, 0
$1.RestrictNamespaces, config_parse_warn_compat, DISABLED_CONFIGURATION, 0
$1.RestrictRealtime, config_parse_warn_compat, DISABLED_CONFIGURATION, 0
$1.RestrictSUIDSGID, config_parse_warn_compat, DISABLED_CONFIGURATION 0
$1.RestrictAddressFamilies, config_parse_warn_compat, DISABLED_CONFIGURATION, 0
$1.LockPersonality, config_parse_warn_compat, DISABLED_CONFIGURATION, 0')
$1.LimitCPU, config_parse_rlimit, RLIMIT_CPU, offsetof($1, exec_context.rlimit)

12
src/shared/bus-unit-util.c
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@ -746,12 +746,12 @@ static int bus_append_execute_property(sd_bus_message *m, const char *field, con
return bus_append_string(m, field, eq);
if (STR_IN_SET(field,
"IgnoreSIGPIPE", "TTYVHangup", "TTYReset", "TTYVTDisallocate",
"PrivateTmp", "PrivateDevices", "PrivateNetwork", "PrivateUsers",
"PrivateMounts", "NoNewPrivileges", "SyslogLevelPrefix",
"MemoryDenyWriteExecute", "RestrictRealtime", "DynamicUser", "RemoveIPC",
"ProtectKernelTunables", "ProtectKernelModules", "ProtectControlGroups",
"MountAPIVFS", "CPUSchedulingResetOnFork", "LockPersonality", "ProtectHostname"))
"IgnoreSIGPIPE", "TTYVHangup", "TTYReset", "TTYVTDisallocate", "PrivateTmp",
"PrivateDevices", "PrivateNetwork", "PrivateUsers", "PrivateMounts",
"NoNewPrivileges", "SyslogLevelPrefix", "MemoryDenyWriteExecute", "RestrictRealtime",
"DynamicUser", "RemoveIPC", "ProtectKernelTunables", "ProtectKernelModules",
"ProtectControlGroups", "MountAPIVFS", "CPUSchedulingResetOnFork", "LockPersonality",
"ProtectHostname", "RestrictSUIDSGID"))
return bus_append_parse_boolean(m, field, eq);

1
test/fuzz/fuzz-unit-file/directives.service
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@ -851,6 +851,7 @@ ReserveVT=
RestrictAddressFamilies=
RestrictNamespaces=
RestrictRealtime=
RestrictSUIDSGID=
RuntimeDirectory=
RuntimeDirectoryMode=
RuntimeDirectoryPreserve=