static int bus_get_audit_data(
DBusConnection *connection,
const char *name,
struct auditstruct *audit,
DBusError *error) {
pid_t pid;
int r;
pid = bus_get_unix_process_id(connection, name, error);
if (pid <= 0)
return -EIO;
r = audit_loginuid_from_pid(pid, &audit->loginuid);
if (r < 0)
return r;
r = get_process_uid(pid, &audit->uid);
if (r < 0)
return r;
r = get_process_gid(pid, &audit->gid);
if (r < 0)
return r;
r = get_process_cmdline(pid, LINE_MAX, true, &audit->cmdline);
if (r < 0)
return r;
return 0;
}
static int bus_get_selinux_security_context(
DBusConnection *connection,
const char *name,
char **scon,
DBusError *error) {
_cleanup_dbus_message_unref_ DBusMessage *m = NULL, *reply = NULL;
DBusMessageIter iter, sub;
const char *bytes;
char *b;
int nbytes;
m = dbus_message_new_method_call(
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"GetConnectionSELinuxSecurityContext");
if (!m) {
dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
return -ENOMEM;
}
if (!dbus_message_append_args(
m,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_INVALID)) {
dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
return -ENOMEM;
}
reply = dbus_connection_send_with_reply_and_block(connection, m, -1, error);
if (!reply)
return -EIO;
if (dbus_set_error_from_message(error, reply))
return -EIO;
if (!dbus_message_iter_init(reply, &iter))
return -EIO;
if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY)
return -EIO;
dbus_message_iter_recurse(&iter, &sub);
dbus_message_iter_get_fixed_array(&sub, &bytes, &nbytes);
b = strndup(bytes, nbytes);
if (!b)
return -ENOMEM;
*scon = b;
log_debug("GetConnectionSELinuxSecurityContext %s (pid %ld)", *scon, (long) bus_get_unix_process_id(connection, name, error));
return 0;
}
int verify_polkit(
DBusConnection *c,
DBusMessage *request,
const char *action,
bool interactive,
bool *_challenge,
DBusError *error) {
#ifdef ENABLE_POLKIT
DBusMessage *m = NULL, *reply = NULL;
const char *unix_process = "unix-process", *pid = "pid", *starttime = "start-time", *cancel_id = "";
uint32_t flags = interactive ? 1 : 0;
pid_t pid_raw;
uint32_t pid_u32;
unsigned long long starttime_raw;
uint64_t starttime_u64;
DBusMessageIter iter_msg, iter_struct, iter_array, iter_dict, iter_variant;
int r;
dbus_bool_t authorized = FALSE, challenge = FALSE;
#endif
const char *sender;
unsigned long ul;
assert(c);
assert(request);
sender = dbus_message_get_sender(request);
if (!sender)
return -EINVAL;
ul = dbus_bus_get_unix_user(c, sender, error);
if (ul == (unsigned long) -1)
return -EINVAL;
/* Shortcut things for root, to avoid the PK roundtrip and dependency */
if (ul == 0)
return 1;
#ifdef ENABLE_POLKIT
pid_raw = bus_get_unix_process_id(c, sender, error);
if (pid_raw == 0)
return -EINVAL;
r = get_starttime_of_pid(pid_raw, &starttime_raw);
if (r < 0)
return r;
m = dbus_message_new_method_call(
"org.freedesktop.PolicyKit1",
"/org/freedesktop/PolicyKit1/Authority",
"org.freedesktop.PolicyKit1.Authority",
"CheckAuthorization");
if (!m)
return -ENOMEM;
dbus_message_iter_init_append(m, &iter_msg);
pid_u32 = (uint32_t) pid_raw;
starttime_u64 = (uint64_t) starttime_raw;
if (!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_STRUCT, NULL, &iter_struct) ||
!dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &unix_process) ||
!dbus_message_iter_open_container(&iter_struct, DBUS_TYPE_ARRAY, "{sv}", &iter_array) ||
!dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
!dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &pid) ||
!dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "u", &iter_variant) ||
!dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT32, &pid_u32) ||
!dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
!dbus_message_iter_close_container(&iter_array, &iter_dict) ||
!dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
!dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &starttime) ||
!dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "t", &iter_variant) ||
!dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT64, &starttime_u64) ||
!dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
!dbus_message_iter_close_container(&iter_array, &iter_dict) ||
!dbus_message_iter_close_container(&iter_struct, &iter_array) ||
!dbus_message_iter_close_container(&iter_msg, &iter_struct) ||
!dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &action) ||
!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_ARRAY, "{ss}", &iter_array) ||
!dbus_message_iter_close_container(&iter_msg, &iter_array) ||
!dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_UINT32, &flags) ||
!dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &cancel_id)) {
r = -ENOMEM;
goto finish;
}
reply = dbus_connection_send_with_reply_and_block(c, m, -1, error);
if (!reply) {
/* Treat no PK available as access denied */
if (dbus_error_has_name(error, DBUS_ERROR_SERVICE_UNKNOWN)) {
r = -EACCES;
dbus_error_free(error);
goto finish;
}
r = -EIO;
goto finish;
}
if (!dbus_message_iter_init(reply, &iter_msg) ||
dbus_message_iter_get_arg_type(&iter_msg) != DBUS_TYPE_STRUCT) {
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&iter_msg, &iter_struct);
if (dbus_message_iter_get_arg_type(&iter_struct) != DBUS_TYPE_BOOLEAN) {
r = -EIO;
goto finish;
}
dbus_message_iter_get_basic(&iter_struct, &authorized);
if (!dbus_message_iter_next(&iter_struct) ||
dbus_message_iter_get_arg_type(&iter_struct) != DBUS_TYPE_BOOLEAN) {
r = -EIO;
goto finish;
}
dbus_message_iter_get_basic(&iter_struct, &challenge);
if (authorized)
r = 1;
else if (_challenge) {
*_challenge = !!challenge;
r = 0;
} else
r = -EPERM;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
return r;
#else
return -EPERM;
#endif
}
