summaryrefslogtreecommitdiff
path: root/src/machine/machine-dbus.c
blob: 116e711a78f68403d22e758cd394225076c46fbb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2011 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/mount.h>

/* When we include libgen.h because we need dirname() we immediately
 * undefine basename() since libgen.h defines it as a macro to the XDG
 * version which is really broken. */
#include <libgen.h>
#undef basename

#include "bus-util.h"
#include "bus-label.h"
#include "strv.h"
#include "bus-common-errors.h"
#include "copy.h"
#include "fileio.h"
#include "in-addr-util.h"
#include "local-addresses.h"
#include "path-util.h"
#include "mkdir.h"
#include "bus-internal.h"
#include "machine.h"
#include "machine-dbus.h"

static int property_get_id(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Machine *m = userdata;
        int r;

        assert(bus);
        assert(reply);
        assert(m);

        r = sd_bus_message_append_array(reply, 'y', &m->id, 16);
        if (r < 0)
                return r;

        return 1;
}

static int property_get_state(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Machine *m = userdata;
        const char *state;
        int r;

        assert(bus);
        assert(reply);
        assert(m);

        state = machine_state_to_string(machine_get_state(m));

        r = sd_bus_message_append_basic(reply, 's', state);
        if (r < 0)
                return r;

        return 1;
}

static int property_get_netif(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Machine *m = userdata;
        int r;

        assert(bus);
        assert(reply);
        assert(m);

        assert_cc(sizeof(int) == sizeof(int32_t));

        r = sd_bus_message_append_array(reply, 'i', m->netif, m->n_netif * sizeof(int));
        if (r < 0)
                return r;

        return 1;
}

static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_class, machine_class, MachineClass);

int bus_machine_method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Machine *m = userdata;
        int r;

        assert(bus);
        assert(message);
        assert(m);

        r = bus_verify_polkit_async(
                        message,
                        CAP_KILL,
                        "org.freedesktop.machine1.manage-machines",
                        false,
                        UID_INVALID,
                        &m->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Will call us back */

        r = machine_stop(m);
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

int bus_machine_method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Machine *m = userdata;
        const char *swho;
        int32_t signo;
        KillWho who;
        int r;

        assert(bus);
        assert(message);
        assert(m);

        r = sd_bus_message_read(message, "si", &swho, &signo);
        if (r < 0)
                return r;

        if (isempty(swho))
                who = KILL_ALL;
        else {
                who = kill_who_from_string(swho);
                if (who < 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid kill parameter '%s'", swho);
        }

        if (signo <= 0 || signo >= _NSIG)
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);

        r = bus_verify_polkit_async(
                        message,
                        CAP_KILL,
                        "org.freedesktop.machine1.manage-machines",
                        false,
                        UID_INVALID,
                        &m->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Will call us back */

        r = machine_kill(m, who, signo);
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

int bus_machine_method_get_addresses(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
        _cleanup_close_pair_ int pair[2] = { -1, -1 };
        _cleanup_free_ char *us = NULL, *them = NULL;
        _cleanup_close_ int netns_fd = -1;
        Machine *m = userdata;
        const char *p;
        siginfo_t si;
        pid_t child;
        int r;

        assert(bus);
        assert(message);
        assert(m);

        if (m->class != MACHINE_CONTAINER)
                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting IP address data is only supported on container machines.");

        r = readlink_malloc("/proc/self/ns/net", &us);
        if (r < 0)
                return r;

        p = procfs_file_alloca(m->leader, "ns/net");
        r = readlink_malloc(p, &them);
        if (r < 0)
                return r;

        if (streq(us, them))
                return sd_bus_error_setf(error, BUS_ERROR_NO_PRIVATE_NETWORKING, "Machine %s does not use private networking", m->name);

        r = namespace_open(m->leader, NULL, NULL, &netns_fd, NULL);
        if (r < 0)
                return r;

        if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0)
                return -errno;

        child = fork();
        if (child < 0)
                return sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");

        if (child == 0) {
                _cleanup_free_ struct local_address *addresses = NULL;
                struct local_address *a;
                int i, n;

                pair[0] = safe_close(pair[0]);

                r = namespace_enter(-1, -1, netns_fd, -1);
                if (r < 0)
                        _exit(EXIT_FAILURE);

                n = local_addresses(NULL, 0, AF_UNSPEC, &addresses);
                if (n < 0)
                        _exit(EXIT_FAILURE);

                for (a = addresses, i = 0; i < n; a++, i++) {
                        struct iovec iov[2] = {
                                { .iov_base = &a->family, .iov_len = sizeof(a->family) },
                                { .iov_base = &a->address, .iov_len = FAMILY_ADDRESS_SIZE(a->family) },
                        };

                        r = writev(pair[1], iov, 2);
                        if (r < 0)
                                _exit(EXIT_FAILURE);
                }

                pair[1] = safe_close(pair[1]);

                _exit(EXIT_SUCCESS);
        }

        pair[1] = safe_close(pair[1]);

        r = sd_bus_message_new_method_return(message, &reply);
        if (r < 0)
                return r;

        r = sd_bus_message_open_container(reply, 'a', "(iay)");
        if (r < 0)
                return r;

        for (;;) {
                int family;
                ssize_t n;
                union in_addr_union in_addr;
                struct iovec iov[2];
                struct msghdr mh = {
                        .msg_iov = iov,
                        .msg_iovlen = 2,
                };

                iov[0] = (struct iovec) { .iov_base = &family, .iov_len = sizeof(family) };
                iov[1] = (struct iovec) { .iov_base = &in_addr, .iov_len = sizeof(in_addr) };

                n = recvmsg(pair[0], &mh, 0);
                if (n < 0)
                        return -errno;
                if ((size_t) n < sizeof(family))
                        break;

                r = sd_bus_message_open_container(reply, 'r', "iay");
                if (r < 0)
                        return r;

                r = sd_bus_message_append(reply, "i", family);
                if (r < 0)
                        return r;

                switch (family) {

                case AF_INET:
                        if (n != sizeof(struct in_addr) + sizeof(family))
                                return -EIO;

                        r = sd_bus_message_append_array(reply, 'y', &in_addr.in, sizeof(in_addr.in));
                        break;

                case AF_INET6:
                        if (n != sizeof(struct in6_addr) + sizeof(family))
                                return -EIO;

                        r = sd_bus_message_append_array(reply, 'y', &in_addr.in6, sizeof(in_addr.in6));
                        break;
                }
                if (r < 0)
                        return r;

                r = sd_bus_message_close_container(reply);
                if (r < 0)
                        return r;
        }

        r = wait_for_terminate(child, &si);
        if (r < 0)
                return sd_bus_error_set_errnof(error, r, "Failed to wait for client: %m");
        if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
                return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Client died abnormally.");

        r = sd_bus_message_close_container(reply);
        if (r < 0)
                return r;

        return sd_bus_send(bus, reply, NULL);
}

int bus_machine_method_get_os_release(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
        _cleanup_close_ int mntns_fd = -1, root_fd = -1;
        _cleanup_close_pair_ int pair[2] = { -1, -1 };
        _cleanup_strv_free_ char **l = NULL;
        _cleanup_fclose_ FILE *f = NULL;
        Machine *m = userdata;
        char **k, **v;
        siginfo_t si;
        pid_t child;
        int r;

        assert(bus);
        assert(message);
        assert(m);

        if (m->class != MACHINE_CONTAINER)
                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting OS release data is only supported on container machines.");

        r = namespace_open(m->leader, NULL, &mntns_fd, NULL, &root_fd);
        if (r < 0)
                return r;

        if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0)
                return -errno;

        child = fork();
        if (child < 0)
                return sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");

        if (child == 0) {
                _cleanup_close_ int fd = -1;

                pair[0] = safe_close(pair[0]);

                r = namespace_enter(-1, mntns_fd, -1, root_fd);
                if (r < 0)
                        _exit(EXIT_FAILURE);

                fd = open("/etc/os-release", O_RDONLY|O_CLOEXEC);
                if (fd < 0) {
                        fd = open("/usr/lib/os-release", O_RDONLY|O_CLOEXEC);
                        if (fd < 0)
                                _exit(EXIT_FAILURE);
                }

                r = copy_bytes(fd, pair[1], (off_t) -1, false);
                if (r < 0)
                        _exit(EXIT_FAILURE);

                _exit(EXIT_SUCCESS);
        }

        pair[1] = safe_close(pair[1]);

        f = fdopen(pair[0], "re");
        if (!f)
                return -errno;

        pair[0] = -1;

        r = load_env_file_pairs(f, "/etc/os-release", NULL, &l);
        if (r < 0)
                return r;

        r = wait_for_terminate(child, &si);
        if (r < 0)
                return sd_bus_error_set_errnof(error, r, "Failed to wait for client: %m");
        if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
                return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Client died abnormally.");

        r = sd_bus_message_new_method_return(message, &reply);
        if (r < 0)
                return r;

        r = sd_bus_message_open_container(reply, 'a', "{ss}");
        if (r < 0)
                return r;

        STRV_FOREACH_PAIR(k, v, l) {
                r = sd_bus_message_append(reply, "{ss}", *k, *v);
                if (r < 0)
                        return r;
        }

        r = sd_bus_message_close_container(reply);
        if (r < 0)
                return r;

        return sd_bus_send(bus, reply, NULL);
}

int bus_machine_method_open_pty(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
        _cleanup_free_ char *pty_name = NULL;
        _cleanup_close_ int master = -1;
        Machine *m = userdata;
        int r;

        assert(bus);
        assert(message);
        assert(m);

        if (m->class != MACHINE_CONTAINER)
                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Opening pseudo TTYs is only supported on container machines.");

        master = openpt_in_namespace(m->leader, O_RDWR|O_NOCTTY|O_CLOEXEC);
        if (master < 0)
                return master;

        r = ptsname_malloc(master, &pty_name);
        if (r < 0)
                return r;

        r = sd_bus_message_new_method_return(message, &reply);
        if (r < 0)
                return r;

        r = sd_bus_message_append(reply, "hs", master, pty_name);
        if (r < 0)
                return r;

        return sd_bus_send(bus, reply, NULL);
}

int bus_machine_method_open_login(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
        _cleanup_free_ char *pty_name = NULL, *getty = NULL;
        _cleanup_bus_unref_ sd_bus *container_bus = NULL;
        _cleanup_close_ int master = -1;
        Machine *m = userdata;
        const char *p;
        int r;

        if (m->class != MACHINE_CONTAINER)
                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Opening logins is only supported on container machines.");

        r = bus_verify_polkit_async(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.machine1.login",
                        false,
                        UID_INVALID,
                        &m->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Will call us back */

        master = openpt_in_namespace(m->leader, O_RDWR|O_NOCTTY|O_CLOEXEC);
        if (master < 0)
                return master;

        r = ptsname_malloc(master, &pty_name);
        if (r < 0)
                return r;

        p = path_startswith(pty_name, "/dev/pts/");
        if (!p)
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "PTS name %s is invalid", pty_name);

        if (unlockpt(master) < 0)
                return -errno;

        r = sd_bus_new(&container_bus);
        if (r < 0)
                return r;

#ifdef ENABLE_KDBUS
        asprintf(&container_bus->address, "x-machine-kernel:pid=" PID_FMT ";x-machine-unix:pid=" PID_FMT, m->leader, m->leader);
#else
        asprintf(&container_bus->address, "x-machine-kernel:pid=" PID_FMT, m->leader);
#endif
        if (!container_bus->address)
                return log_oom();

        container_bus->bus_client = true;
        container_bus->trusted = false;
        container_bus->is_system = true;

        r = sd_bus_start(container_bus);
        if (r < 0)
                return r;

        getty = strjoin("container-getty@", p, ".service", NULL);
        if (!getty)
                return log_oom();

        r = sd_bus_call_method(
                        container_bus,
                        "org.freedesktop.systemd1",
                        "/org/freedesktop/systemd1",
                        "org.freedesktop.systemd1.Manager",
                        "StartUnit",
                        error, NULL,
                        "ss", getty, "replace");
        if (r < 0)
                return r;

        container_bus = sd_bus_unref(container_bus);

        r = sd_bus_message_new_method_return(message, &reply);
        if (r < 0)
                return r;

        r = sd_bus_message_append(reply, "hs", master, pty_name);
        if (r < 0)
                return r;

        return sd_bus_send(bus, reply, NULL);
}

int bus_machine_method_bind_mount(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_close_pair_ int errno_pipe_fd[2] = { -1, -1 };
        char mount_slave[] = "/tmp/propagate.XXXXXX", *mount_tmp, *mount_outside, *p;
        bool mount_slave_created = false, mount_slave_mounted = false,
                mount_tmp_created = false, mount_tmp_mounted = false,
                mount_outside_created = false, mount_outside_mounted = false;
        const char *dest, *src;
        Machine *m = userdata;
        int read_only, make_directory;
        pid_t child;
        siginfo_t si;
        int r;

        if (m->class != MACHINE_CONTAINER)
                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Bind mounting is only supported on container machines.");

        r = sd_bus_message_read(message, "ssbb", &src, &dest, &read_only, &make_directory);
        if (r < 0)
                return r;

        if (!path_is_absolute(src) || !path_is_safe(src))
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Source path must be absolute and not contain ../.");

        if (isempty(dest))
                dest = src;
        else if (!path_is_absolute(dest) || !path_is_safe(dest))
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Destination path must be absolute and not contain ../.");

        r = bus_verify_polkit_async(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.machine1.manage-machines",
                        false,
                        UID_INVALID,
                        &m->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Will call us back */

        /* One day, when bind mounting /proc/self/fd/n works across
         * namespace boundaries we should rework this logic to make
         * use of it... */

        p = strjoina("/run/systemd/nspawn/propagate/", m->name, "/");
        if (laccess(p, F_OK) < 0)
                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Container does not allow propagation of mount points.");

        /* Our goal is to install a new bind mount into the container,
           possibly read-only. This is irritatingly complex
           unfortunately, currently.

           First, we start by creating a private playground in /tmp,
           that we can mount MS_SLAVE. (Which is necessary, since
           MS_MOUNT cannot be applied to mounts with MS_SHARED parent
           mounts.) */

        if (!mkdtemp(mount_slave))
                return sd_bus_error_set_errnof(error, errno, "Failed to create playground %s: %m", mount_slave);

        mount_slave_created = true;

        if (mount(mount_slave, mount_slave, NULL, MS_BIND, NULL) < 0) {
                r = sd_bus_error_set_errnof(error, errno, "Failed to make bind mount %s: %m", mount_slave);
                goto finish;
        }

        mount_slave_mounted = true;

        if (mount(NULL, mount_slave, NULL, MS_SLAVE, NULL) < 0) {
                r = sd_bus_error_set_errnof(error, errno, "Failed to remount slave %s: %m", mount_slave);
                goto finish;
        }

        /* Second, we mount the source directory to a directory inside
           of our MS_SLAVE playground. */
        mount_tmp = strjoina(mount_slave, "/mount");
        if (mkdir(mount_tmp, 0700) < 0) {
                r = sd_bus_error_set_errnof(error, errno, "Failed to create temporary mount point %s: %m", mount_tmp);
                goto finish;
        }

        mount_tmp_created = true;

        if (mount(src, mount_tmp, NULL, MS_BIND, NULL) < 0) {
                r = sd_bus_error_set_errnof(error, errno, "Failed to overmount %s: %m", mount_tmp);
                goto finish;
        }

        mount_tmp_mounted = true;

        /* Third, we remount the new bind mount read-only if requested. */
        if (read_only)
                if (mount(NULL, mount_tmp, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL) < 0) {
                        r = sd_bus_error_set_errnof(error, errno, "Failed to remount read-only %s: %m", mount_tmp);
                        goto finish;
                }

        /* Fourth, we move the new bind mount into the propagation
         * directory. This way it will appear there read-only
         * right-away. */

        mount_outside = strjoina("/run/systemd/nspawn/propagate/", m->name, "/XXXXXX");
        if (!mkdtemp(mount_outside)) {
                r = sd_bus_error_set_errnof(error, errno, "Cannot create propagation directory %s: %m", mount_outside);
                goto finish;
        }

        mount_outside_created = true;

        if (mount(mount_tmp, mount_outside, NULL, MS_MOVE, NULL) < 0) {
                r = sd_bus_error_set_errnof(error, errno, "Failed to move %s to %s: %m", mount_tmp, mount_outside);
                goto finish;
        }

        mount_outside_mounted = true;
        mount_tmp_mounted = false;

        (void) rmdir(mount_tmp);
        mount_tmp_created = false;

        (void) umount(mount_slave);
        mount_slave_mounted = false;

        (void) rmdir(mount_slave);
        mount_slave_created = false;

        if (pipe2(errno_pipe_fd, O_CLOEXEC|O_NONBLOCK) < 0) {
                r = sd_bus_error_set_errnof(error, errno, "Failed to create pipe: %m");
                goto finish;
        }

        child = fork();
        if (child < 0) {
                r = sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");
                goto finish;
        }

        if (child == 0) {
                const char *mount_inside;
                int mntfd;
                const char *q;

                errno_pipe_fd[0] = safe_close(errno_pipe_fd[0]);

                q = procfs_file_alloca(m->leader, "ns/mnt");
                mntfd = open(q, O_RDONLY|O_NOCTTY|O_CLOEXEC);
                if (mntfd < 0) {
                        r = log_error_errno(errno, "Failed to open mount namespace of leader: %m");
                        goto child_fail;
                }

                if (setns(mntfd, CLONE_NEWNS) < 0) {
                        r = log_error_errno(errno, "Failed to join namespace of leader: %m");
                        goto child_fail;
                }

                if (make_directory)
                        (void) mkdir_p(dest, 0755);

                /* Fifth, move the mount to the right place inside */
                mount_inside = strjoina("/run/systemd/nspawn/incoming/", basename(mount_outside));
                if (mount(mount_inside, dest, NULL, MS_MOVE, NULL) < 0) {
                        r = log_error_errno(errno, "Failed to mount: %m");
                        goto child_fail;
                }

                _exit(EXIT_SUCCESS);

        child_fail:
                (void) write(errno_pipe_fd[1], &r, sizeof(r));
                errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]);

                _exit(EXIT_FAILURE);
        }

        errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]);

        r = wait_for_terminate(child, &si);
        if (r < 0) {
                r = sd_bus_error_set_errnof(error, r, "Failed to wait for client: %m");
                goto finish;
        }
        if (si.si_code != CLD_EXITED) {
                r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Client died abnormally.");
                goto finish;
        }
        if (si.si_status != EXIT_SUCCESS) {

                if (read(errno_pipe_fd[0], &r, sizeof(r)) == sizeof(r))
                        r = sd_bus_error_set_errnof(error, r, "Failed to mount: %m");
                else
                        r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Client failed.");
                goto finish;
        }

        r = sd_bus_reply_method_return(message, NULL);

finish:
        if (mount_outside_mounted)
                umount(mount_outside);
        if (mount_outside_created)
                rmdir(mount_outside);

        if (mount_tmp_mounted)
                umount(mount_tmp);
        if (mount_tmp_created)
                rmdir(mount_tmp);

        if (mount_slave_mounted)
                umount(mount_slave);
        if (mount_slave_created)
                rmdir(mount_slave);

        return r;
}

static int machine_operation_done(sd_event_source *s, const siginfo_t *si, void *userdata) {
        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
        MachineOperation *o = userdata;
        int r;

        assert(o);
        assert(si);

        o->pid = 0;

        if (si->si_code != CLD_EXITED) {
                r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Client died abnormally.");
                goto fail;
        }

        if (si->si_status != EXIT_SUCCESS) {
                if (read(o->errno_fd, &r, sizeof(r)) == sizeof(r))
                        r = sd_bus_error_set_errnof(&error, r, "%m");
                else
                        r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Client failed.");

                goto fail;
        }

        r = sd_bus_reply_method_return(o->message, NULL);
        if (r < 0)
                log_error_errno(r, "Failed to reply to message: %m");

        machine_operation_unref(o);
        return 0;

fail:
        r = sd_bus_reply_method_error(o->message, &error);
        if (r < 0)
                log_error_errno(r, "Failed to reply to message: %m");

        machine_operation_unref(o);
        return 0;
}

int bus_machine_method_copy(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
        const char *src, *dest, *host_path, *container_path, *host_basename, *host_dirname, *container_basename, *container_dirname;
        _cleanup_close_pair_ int errno_pipe_fd[2] = { -1, -1 };
        _cleanup_close_ int hostfd = -1;
        Machine *m = userdata;
        MachineOperation *o;
        bool copy_from;
        pid_t child;
        char *t;
        int r;

        if (m->n_operations >= MACHINE_OPERATIONS_MAX)
                return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Too many ongoing copies.");

        if (m->class != MACHINE_CONTAINER)
                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Copying files is only supported on container machines.");

        r = sd_bus_message_read(message, "ss", &src, &dest);
        if (r < 0)
                return r;

        if (!path_is_absolute(src) || !path_is_safe(src))
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Source path must be absolute and not contain ../.");

        if (isempty(dest))
                dest = src;
        else if (!path_is_absolute(dest) || !path_is_safe(dest))
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Destination path must be absolute and not contain ../.");

        r = bus_verify_polkit_async(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.machine1.manage-machines",
                        false,
                        UID_INVALID,
                        &m->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Will call us back */

        copy_from = strstr(sd_bus_message_get_member(message), "CopyFrom");

        if (copy_from) {
                container_path = src;
                host_path = dest;
        } else {
                host_path = src;
                container_path = dest;
        }

        host_basename = basename(host_path);
        t = strdupa(host_path);
        host_dirname = dirname(t);

        container_basename = basename(container_path);
        t = strdupa(container_path);
        container_dirname = dirname(t);

        hostfd = open(host_dirname, O_CLOEXEC|O_RDONLY|O_NOCTTY|O_DIRECTORY);
        if (r < 0)
                return sd_bus_error_set_errnof(error, errno, "Failed to open host directory %s: %m", host_dirname);

        if (pipe2(errno_pipe_fd, O_CLOEXEC|O_NONBLOCK) < 0)
                return sd_bus_error_set_errnof(error, errno, "Failed to create pipe: %m");

        child = fork();
        if (child < 0)
                return sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");

        if (child == 0) {
                int containerfd;
                const char *q;
                int mntfd;

                errno_pipe_fd[0] = safe_close(errno_pipe_fd[0]);

                q = procfs_file_alloca(m->leader, "ns/mnt");
                mntfd = open(q, O_RDONLY|O_NOCTTY|O_CLOEXEC);
                if (mntfd < 0) {
                        r = log_error_errno(errno, "Failed to open mount namespace of leader: %m");
                        goto child_fail;
                }

                if (setns(mntfd, CLONE_NEWNS) < 0) {
                        r = log_error_errno(errno, "Failed to join namespace of leader: %m");
                        goto child_fail;
                }

                containerfd = open(container_dirname, O_CLOEXEC|O_RDONLY|O_NOCTTY|O_DIRECTORY);
                if (containerfd < 0) {
                        r = log_error_errno(errno, "Failed top open destination directory: %m");
                        goto child_fail;
                }

                if (copy_from)
                        r = copy_tree_at(containerfd, container_basename, hostfd, host_basename, true);
                else
                        r = copy_tree_at(hostfd, host_basename, containerfd, container_basename, true);

                hostfd = safe_close(hostfd);
                containerfd = safe_close(containerfd);

                if (r < 0) {
                        r = log_error_errno(r, "Failed to copy tree: %m");
                        goto child_fail;
                }

                _exit(EXIT_SUCCESS);

        child_fail:
                (void) write(errno_pipe_fd[1], &r, sizeof(r));
                errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]);

                _exit(EXIT_FAILURE);
        }

        errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]);

        /* Copying might take a while, hence install a watch the
         * child, and return */

        o = new0(MachineOperation, 1);
        if (!o)
                return log_oom();

        o->pid = child;
        o->message = sd_bus_message_ref(message);
        o->errno_fd = errno_pipe_fd[0];
        errno_pipe_fd[0] = -1;

        r = sd_event_add_child(m->manager->event, &o->event_source, child, WEXITED, machine_operation_done, o);
        if (r < 0) {
                machine_operation_unref(o);
                return log_oom();
        }

        LIST_PREPEND(operations, m->operations, o);
        m->n_operations++;
        o->machine = m;

        return 1;
}

const sd_bus_vtable machine_vtable[] = {
        SD_BUS_VTABLE_START(0),
        SD_BUS_PROPERTY("Name", "s", NULL, offsetof(Machine, name), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("Id", "ay", property_get_id, 0, SD_BUS_VTABLE_PROPERTY_CONST),
        BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(Machine, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("Service", "s", NULL, offsetof(Machine, service), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("Unit", "s", NULL, offsetof(Machine, unit), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Machine, unit), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
        SD_BUS_PROPERTY("Leader", "u", NULL, offsetof(Machine, leader), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("Class", "s", property_get_class, offsetof(Machine, class), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("RootDirectory", "s", NULL, offsetof(Machine, root_directory), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("NetworkInterfaces", "ai", property_get_netif, 0, SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
        SD_BUS_METHOD("Terminate", NULL, NULL, bus_machine_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("Kill", "si", NULL, bus_machine_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("GetAddresses", NULL, "a(iay)", bus_machine_method_get_addresses, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("GetOSRelease", NULL, "a{ss}", bus_machine_method_get_os_release, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("OpenPTY", NULL, "hs", bus_machine_method_open_pty, 0),
        SD_BUS_METHOD("OpenLogin", NULL, "hs", bus_machine_method_open_login, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("BindMount", "ssbb", NULL, bus_machine_method_bind_mount, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("CopyFrom", "ss", NULL, bus_machine_method_copy, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("CopyTo", "ss", NULL, bus_machine_method_copy, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_VTABLE_END
};

int machine_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
        Manager *m = userdata;
        Machine *machine;
        int r;

        assert(bus);
        assert(path);
        assert(interface);
        assert(found);
        assert(m);

        if (streq(path, "/org/freedesktop/machine1/machine/self")) {
                _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
                sd_bus_message *message;
                pid_t pid;

                message = sd_bus_get_current_message(bus);
                if (!message)
                        return 0;

                r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
                if (r < 0)
                        return r;

                r = sd_bus_creds_get_pid(creds, &pid);
                if (r < 0)
                        return r;

                r = manager_get_machine_by_pid(m, pid, &machine);
                if (r <= 0)
                        return 0;
        } else {
                _cleanup_free_ char *e = NULL;
                const char *p;

                p = startswith(path, "/org/freedesktop/machine1/machine/");
                if (!p)
                        return 0;

                e = bus_label_unescape(p);
                if (!e)
                        return -ENOMEM;

                machine = hashmap_get(m->machines, e);
                if (!machine)
                        return 0;
        }

        *found = machine;
        return 1;
}

char *machine_bus_path(Machine *m) {
        _cleanup_free_ char *e = NULL;

        assert(m);

        e = bus_label_escape(m->name);
        if (!e)
                return NULL;

        return strappend("/org/freedesktop/machine1/machine/", e);
}

int machine_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
        _cleanup_strv_free_ char **l = NULL;
        Machine *machine = NULL;
        Manager *m = userdata;
        Iterator i;
        int r;

        assert(bus);
        assert(path);
        assert(nodes);

        HASHMAP_FOREACH(machine, m->machines, i) {
                char *p;

                p = machine_bus_path(machine);
                if (!p)
                        return -ENOMEM;

                r = strv_consume(&l, p);
                if (r < 0)
                        return r;
        }

        *nodes = l;
        l = NULL;

        return 1;
}

int machine_send_signal(Machine *m, bool new_machine) {
        _cleanup_free_ char *p = NULL;

        assert(m);

        p = machine_bus_path(m);
        if (!p)
                return -ENOMEM;

        return sd_bus_emit_signal(
                        m->manager->bus,
                        "/org/freedesktop/machine1",
                        "org.freedesktop.machine1.Manager",
                        new_machine ? "MachineNew" : "MachineRemoved",
                        "so", m->name, p);
}

int machine_send_create_reply(Machine *m, sd_bus_error *error) {
        _cleanup_bus_message_unref_ sd_bus_message *c = NULL;
        _cleanup_free_ char *p = NULL;

        assert(m);

        if (!m->create_message)
                return 0;

        c = m->create_message;
        m->create_message = NULL;

        if (error)
                return sd_bus_reply_method_error(c, error);

        /* Update the machine state file before we notify the client
         * about the result. */
        machine_save(m);

        p = machine_bus_path(m);
        if (!p)
                return -ENOMEM;

        return sd_bus_reply_method_return(c, "o", p);
}