src/nspawn/nspawn-register.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2015 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "sd-bus.h"
  21
  22 #include "bus-error.h"
  23 #include "bus-util.h"
  24 #include "nspawn-register.h"
  25 #include "stat-util.h"
  26 #include "strv.h"
  27 #include "util.h"
  28
  29 int register_machine(
  30                 const char *machine_name,
  31                 pid_t pid,
  32                 const char *directory,
  33                 sd_id128_t uuid,
  34                 int local_ifindex,
  35                 const char *slice,
  36                 CustomMount *mounts,
  37                 unsigned n_mounts,
  38                 int kill_signal,
  39                 char **properties,
  40                 bool keep_unit,
  41                 const char *service) {
  42
  43         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  44         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
  45         int r;
  46
  47         r = sd_bus_default_system(&bus);
  48         if (r < 0)
  49                 return log_error_errno(r, "Failed to open system bus: %m");
  50
  51         if (keep_unit) {
  52                 r = sd_bus_call_method(
  53                                 bus,
  54                                 "org.freedesktop.machine1",
  55                                 "/org/freedesktop/machine1",
  56                                 "org.freedesktop.machine1.Manager",
  57                                 "RegisterMachineWithNetwork",
  58                                 &error,
  59                                 NULL,
  60                                 "sayssusai",
  61                                 machine_name,
  62                                 SD_BUS_MESSAGE_APPEND_ID128(uuid),
  63                                 service,
  64                                 "container",
  65                                 (uint32_t) pid,
  66                                 strempty(directory),
  67                                 local_ifindex > 0 ? 1 : 0, local_ifindex);
  68         } else {
  69                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
  70                 char **i;
  71                 unsigned j;
  72
  73                 r = sd_bus_message_new_method_call(
  74                                 bus,
  75                                 &m,
  76                                 "org.freedesktop.machine1",
  77                                 "/org/freedesktop/machine1",
  78                                 "org.freedesktop.machine1.Manager",
  79                                 "CreateMachineWithNetwork");
  80                 if (r < 0)
  81                         return bus_log_create_error(r);
  82
  83                 r = sd_bus_message_append(
  84                                 m,
  85                                 "sayssusai",
  86                                 machine_name,
  87                                 SD_BUS_MESSAGE_APPEND_ID128(uuid),
  88                                 service,
  89                                 "container",
  90                                 (uint32_t) pid,
  91                                 strempty(directory),
  92                                 local_ifindex > 0 ? 1 : 0, local_ifindex);
  93                 if (r < 0)
  94                         return bus_log_create_error(r);
  95
  96                 r = sd_bus_message_open_container(m, 'a', "(sv)");
  97                 if (r < 0)
  98                         return bus_log_create_error(r);
  99
 100                 if (!isempty(slice)) {
 101                         r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice);
 102                         if (r < 0)
 103                                 return bus_log_create_error(r);
 104                 }
 105
 106                 r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict");
 107                 if (r < 0)
 108                         return bus_log_create_error(r);
 109
 110                 /* If you make changes here, also make sure to update
 111                  * systemd-nspawn@.service, to keep the device
 112                  * policies in sync regardless if we are run with or
 113                  * without the --keep-unit switch. */
 114                 r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 9,
 115                                           /* Allow the container to
 116                                            * access and create the API
 117                                            * device nodes, so that
 118                                            * PrivateDevices= in the
 119                                            * container can work
 120                                            * fine */
 121                                           "/dev/null", "rwm",
 122                                           "/dev/zero", "rwm",
 123                                           "/dev/full", "rwm",
 124                                           "/dev/random", "rwm",
 125                                           "/dev/urandom", "rwm",
 126                                           "/dev/tty", "rwm",
 127                                           "/dev/net/tun", "rwm",
 128                                           /* Allow the container
 129                                            * access to ptys. However,
 130                                            * do not permit the
 131                                            * container to ever create
 132                                            * these device nodes. */
 133                                           "/dev/pts/ptmx", "rw",
 134                                           "char-pts", "rw");
 135                 if (r < 0)
 136                         return bus_log_create_error(r);
 137
 138                 for (j = 0; j < n_mounts; j++) {
 139                         CustomMount *cm = mounts + j;
 140
 141                         if (cm->type != CUSTOM_MOUNT_BIND)
 142                                 continue;
 143
 144                         r = is_device_node(cm->source);
 145                         if (r < 0)
 146                                 return log_error_errno(r, "Failed to stat %s: %m", cm->source);
 147
 148                         if (r) {
 149                                 r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 1,
 150                                         cm->source, cm->read_only ? "r" : "rw");
 151                                 if (r < 0)
 152                                         return log_error_errno(r, "Failed to append message arguments: %m");
 153                         }
 154                 }
 155
 156                 if (kill_signal != 0) {
 157                         r = sd_bus_message_append(m, "(sv)", "KillSignal", "i", kill_signal);
 158                         if (r < 0)
 159                                 return bus_log_create_error(r);
 160
 161                         r = sd_bus_message_append(m, "(sv)", "KillMode", "s", "mixed");
 162                         if (r < 0)
 163                                 return bus_log_create_error(r);
 164                 }
 165
 166                 STRV_FOREACH(i, properties) {
 167                         r = bus_append_unit_property_assignment(m, *i);
 168                         if (r < 0)
 169                                 return r;
 170                 }
 171
 172                 r = sd_bus_message_close_container(m);
 173                 if (r < 0)
 174                         return bus_log_create_error(r);
 175
 176                 r = sd_bus_call(bus, m, 0, &error, NULL);
 177         }
 178
 179         if (r < 0) {
 180                 log_error("Failed to register machine: %s", bus_error_message(&error, r));
 181                 return r;
 182         }
 183
 184         return 0;
 185 }
 186
 187 int terminate_machine(pid_t pid) {
 188         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 189         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 190         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 191         const char *path;
 192         int r;
 193
 194         r = sd_bus_default_system(&bus);
 195         if (r < 0)
 196                 return log_error_errno(r, "Failed to open system bus: %m");
 197
 198         r = sd_bus_call_method(
 199                         bus,
 200                         "org.freedesktop.machine1",
 201                         "/org/freedesktop/machine1",
 202                         "org.freedesktop.machine1.Manager",
 203                         "GetMachineByPID",
 204                         &error,
 205                         &reply,
 206                         "u",
 207                         (uint32_t) pid);
 208         if (r < 0) {
 209                 /* Note that the machine might already have been
 210                  * cleaned up automatically, hence don't consider it a
 211                  * failure if we cannot get the machine object. */
 212                 log_debug("Failed to get machine: %s", bus_error_message(&error, r));
 213                 return 0;
 214         }
 215
 216         r = sd_bus_message_read(reply, "o", &path);
 217         if (r < 0)
 218                 return bus_log_parse_error(r);
 219
 220         r = sd_bus_call_method(
 221                         bus,
 222                         "org.freedesktop.machine1",
 223                         path,
 224                         "org.freedesktop.machine1.Machine",
 225                         "Terminate",
 226                         &error,
 227                         NULL,
 228                         NULL);
 229         if (r < 0) {
 230                 log_debug("Failed to terminate machine: %s", bus_error_message(&error, r));
 231                 return 0;
 232         }
 233
 234         return 0;
 235 }