src/core/dbus-job.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include "log.h"
  23 #include "sd-bus.h"
  24 #include "selinux-access.h"
  25 #include "job.h"
  26 #include "dbus-job.h"
  27 #include "dbus.h"
  28
  29 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, job_type, JobType);
  30 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_state, job_state, JobState);
  31
  32 static int verify_sys_admin_or_owner_sync(sd_bus_message *message, Job *j, sd_bus_error *error) {
  33         _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
  34         int r;
  35
  36         if (sd_bus_track_contains(j->clients, sd_bus_message_get_sender(message)))
  37                 return 0; /* One of the job owners is calling us */
  38
  39         r = sd_bus_query_sender_privilege(message, CAP_SYS_ADMIN);
  40         if (r < 0)
  41                 return r;
  42         if (r == 0)
  43                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Access denied to perform action");
  44
  45         /* Root has called us */
  46         return 0;
  47 }
  48
  49 static int property_get_unit(
  50                 sd_bus *bus,
  51                 const char *path,
  52                 const char *interface,
  53                 const char *property,
  54                 sd_bus_message *reply,
  55                 void *userdata,
  56                 sd_bus_error *error) {
  57
  58         _cleanup_free_ char *p = NULL;
  59         Job *j = userdata;
  60
  61         assert(bus);
  62         assert(reply);
  63         assert(j);
  64
  65         p = unit_dbus_path(j->unit);
  66         if (!p)
  67                 return -ENOMEM;
  68
  69         return sd_bus_message_append(reply, "(so)", j->unit->id, p);
  70 }
  71
  72 int bus_job_method_cancel(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
  73         Job *j = userdata;
  74         int r;
  75
  76         assert(bus);
  77         assert(message);
  78         assert(j);
  79
  80         r = verify_sys_admin_or_owner_sync(message, j, error);
  81         if (r < 0)
  82                 return r;
  83
  84         r = selinux_unit_access_check(j->unit, message, "stop", error);
  85         if (r < 0)
  86                 return r;
  87
  88         job_finish_and_invalidate(j, JOB_CANCELED, true);
  89
  90         return sd_bus_reply_method_return(message, NULL);
  91 }
  92
  93 const sd_bus_vtable bus_job_vtable[] = {
  94         SD_BUS_VTABLE_START(0),
  95         SD_BUS_METHOD("Cancel", NULL, NULL, bus_job_method_cancel, SD_BUS_VTABLE_UNPRIVILEGED),
  96         SD_BUS_PROPERTY("Id", "u", NULL, offsetof(Job, id), SD_BUS_VTABLE_PROPERTY_CONST),
  97         SD_BUS_PROPERTY("Unit", "(so)", property_get_unit, 0, SD_BUS_VTABLE_PROPERTY_CONST),
  98         SD_BUS_PROPERTY("JobType", "s", property_get_type, offsetof(Job, type), SD_BUS_VTABLE_PROPERTY_CONST),
  99         SD_BUS_PROPERTY("State", "s", property_get_state, offsetof(Job, state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 100         SD_BUS_VTABLE_END
 101 };
 102
 103 static int send_new_signal(sd_bus *bus, void *userdata) {
 104         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 105         _cleanup_free_ char *p = NULL;
 106         Job *j = userdata;
 107         int r;
 108
 109         assert(bus);
 110         assert(j);
 111
 112         p = job_dbus_path(j);
 113         if (!p)
 114                 return -ENOMEM;
 115
 116         r = sd_bus_message_new_signal(
 117                         bus,
 118                         &m,
 119                         "/org/freedesktop/systemd1",
 120                         "org.freedesktop.systemd1.Manager",
 121                         "JobNew");
 122         if (r < 0)
 123                 return r;
 124
 125         r = sd_bus_message_append(m, "uos", j->id, p, j->unit->id);
 126         if (r < 0)
 127                 return r;
 128
 129         return sd_bus_send(bus, m, NULL);
 130 }
 131
 132 static int send_changed_signal(sd_bus *bus, void *userdata) {
 133         _cleanup_free_ char *p = NULL;
 134         Job *j = userdata;
 135
 136         assert(bus);
 137         assert(j);
 138
 139         p = job_dbus_path(j);
 140         if (!p)
 141                 return -ENOMEM;
 142
 143         return sd_bus_emit_properties_changed(bus, p, "org.freedesktop.systemd1.Job", "State", NULL);
 144 }
 145
 146 void bus_job_send_change_signal(Job *j) {
 147         int r;
 148
 149         assert(j);
 150
 151         if (j->in_dbus_queue) {
 152                 LIST_REMOVE(dbus_queue, j->manager->dbus_job_queue, j);
 153                 j->in_dbus_queue = false;
 154         }
 155
 156         r = bus_foreach_bus(j->manager, j->clients, j->sent_dbus_new_signal ? send_changed_signal : send_new_signal, j);
 157         if (r < 0)
 158                 log_debug("Failed to send job change signal for %u: %s", j->id, strerror(-r));
 159
 160         j->sent_dbus_new_signal = true;
 161 }
 162
 163 static int send_removed_signal(sd_bus *bus, void *userdata) {
 164         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 165         _cleanup_free_ char *p = NULL;
 166         Job *j = userdata;
 167         int r;
 168
 169         assert(bus);
 170         assert(j);
 171
 172         p = job_dbus_path(j);
 173         if (!p)
 174                 return -ENOMEM;
 175
 176         r = sd_bus_message_new_signal(
 177                         bus,
 178                         &m,
 179                         "/org/freedesktop/systemd1",
 180                         "org.freedesktop.systemd1.Manager",
 181                         "JobRemoved");
 182         if (r < 0)
 183                 return r;
 184
 185         r = sd_bus_message_append(m, "uoss", j->id, p, j->unit->id, job_result_to_string(j->result));
 186         if (r < 0)
 187                 return r;
 188
 189         return sd_bus_send(bus, m, NULL);
 190 }
 191
 192 void bus_job_send_removed_signal(Job *j) {
 193         int r;
 194
 195         assert(j);
 196
 197         if (!j->sent_dbus_new_signal)
 198                 bus_job_send_change_signal(j);
 199
 200         r = bus_foreach_bus(j->manager, j->clients, send_removed_signal, j);
 201         if (r < 0)
 202                 log_debug("Failed to send job remove signal for %u: %s", j->id, strerror(-r));
 203 }