aboutsummaryrefslogtreecommitdiff
path: root/tests/sshserver.pl
blob: 24c98d630c3c865375f0a3230e2730e52df6b09f (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
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
#!/usr/bin/env perl
#***************************************************************************
#                                  _   _ ____  _
#  Project                     ___| | | |  _ \| |
#                             / __| | | | |_) | |
#                            | (__| |_| |  _ <| |___
#                             \___|\___/|_| \_\_____|
#
# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.haxx.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
#***************************************************************************

# Starts sshd for use in the SCP and SFTP curl test harness tests.
# Also creates the ssh configuration files needed for these tests.

use strict;
use warnings;
use Cwd;
use Cwd 'abs_path';
use Digest::MD5;
use Digest::MD5 'md5_hex';
use MIME::Base64;

#***************************************************************************
# Variables and subs imported from sshhelp module
#
use sshhelp qw(
    $sshdexe
    $sshexe
    $sftpsrvexe
    $sftpexe
    $sshkeygenexe
    $sshdconfig
    $sshconfig
    $sftpconfig
    $knownhosts
    $sshdlog
    $sshlog
    $sftplog
    $sftpcmds
    $hstprvkeyf
    $hstpubkeyf
    $hstpubmd5f
    $cliprvkeyf
    $clipubkeyf
    display_sshdconfig
    display_sshconfig
    display_sftpconfig
    display_sshdlog
    display_sshlog
    display_sftplog
    dump_array
    find_sshd
    find_ssh
    find_sftpsrv
    find_sftp
    find_sshkeygen
    logmsg
    sshversioninfo
    );

#***************************************************************************
# Subs imported from serverhelp module
#
use serverhelp qw(
    server_pidfilename
    server_logfilename
    );

use pathhelp;

#***************************************************************************

my $verbose = 0;              # set to 1 for debugging
my $debugprotocol = 0;        # set to 1 for protocol debugging
my $port = 8999;              # our default SCP/SFTP server port
my $listenaddr = '127.0.0.1'; # default address on which to listen
my $ipvnum = 4;               # default IP version of listener address
my $idnum = 1;                # default ssh daemon instance number
my $proto = 'ssh';            # protocol the ssh daemon speaks
my $path = getcwd();          # current working directory
my $logdir = $path .'/log';   # directory for log files
my $username = $ENV{USER};    # default user
my $pidfile;                  # ssh daemon pid file
my $identity = 'curl_client_key'; # default identity file

my $error;
my @cfgarr;


#***************************************************************************
# Parse command line options
#
while(@ARGV) {
    if($ARGV[0] eq '--verbose') {
        $verbose = 1;
    }
    elsif($ARGV[0] eq '--debugprotocol') {
        $verbose = 1;
        $debugprotocol = 1;
    }
    elsif($ARGV[0] eq '--user') {
        if($ARGV[1]) {
            $username = $ARGV[1];
            shift @ARGV;
        }
    }
    elsif($ARGV[0] eq '--id') {
        if($ARGV[1]) {
            if($ARGV[1] =~ /^(\d+)$/) {
                $idnum = $1 if($1 > 0);
                shift @ARGV;
            }
        }
    }
    elsif($ARGV[0] eq '--ipv4') {
        $ipvnum = 4;
        $listenaddr = '127.0.0.1' if($listenaddr eq '::1');
    }
    elsif($ARGV[0] eq '--ipv6') {
        $ipvnum = 6;
        $listenaddr = '::1' if($listenaddr eq '127.0.0.1');
    }
    elsif($ARGV[0] eq '--addr') {
        if($ARGV[1]) {
            my $tmpstr = $ARGV[1];
            if($tmpstr =~ /^(\d\d?\d?)\.(\d\d?\d?)\.(\d\d?\d?)\.(\d\d?\d?)$/) {
                $listenaddr = "$1.$2.$3.$4" if($ipvnum == 4);
                shift @ARGV;
            }
            elsif($ipvnum == 6) {
                $listenaddr = $tmpstr;
                $listenaddr =~ s/^\[(.*)\]$/$1/;
                shift @ARGV;
            }
        }
    }
    elsif($ARGV[0] eq '--pidfile') {
        if($ARGV[1]) {
            $pidfile = "$path/". $ARGV[1];
            shift @ARGV;
        }
    }
    elsif($ARGV[0] eq '--sshport') {
        if($ARGV[1]) {
            if($ARGV[1] =~ /^(\d+)$/) {
                $port = $1;
                shift @ARGV;
            }
        }
    }
    else {
        print STDERR "\nWarning: sshserver.pl unknown parameter: $ARGV[0]\n";
    }
    shift @ARGV;
}


#***************************************************************************
# Default ssh daemon pid file name
#
if(!$pidfile) {
    $pidfile = "$path/". server_pidfilename($proto, $ipvnum, $idnum);
}


#***************************************************************************
# ssh and sftp server log file names
#
$sshdlog = server_logfilename($logdir, 'ssh', $ipvnum, $idnum);
$sftplog = server_logfilename($logdir, 'sftp', $ipvnum, $idnum);


#***************************************************************************
# Logging level for ssh server and client
#
my $loglevel = $debugprotocol?'DEBUG3':'DEBUG2';


#***************************************************************************
# Validate username
#
if(!$username) {
    $error = 'Will not run ssh server without a user name';
}
elsif($username eq 'root') {
    $error = 'Will not run ssh server as root to mitigate security risks';
}
if($error) {
    logmsg $error;
    exit 1;
}


#***************************************************************************
# Find out ssh daemon canonical file name
#
my $sshd = find_sshd();
if(!$sshd) {
    logmsg "cannot find $sshdexe";
    exit 1;
}


#***************************************************************************
# Find out ssh daemon version info
#
my ($sshdid, $sshdvernum, $sshdverstr, $sshderror) = sshversioninfo($sshd);
if(!$sshdid) {
    # Not an OpenSSH or SunSSH ssh daemon
    logmsg $sshderror if($verbose);
    logmsg 'SCP and SFTP tests require OpenSSH 2.9.9 or later';
    exit 1;
}
logmsg "ssh server found $sshd is $sshdverstr" if($verbose);


#***************************************************************************
#  ssh daemon command line options we might use and version support
#
#  -e:  log stderr           : OpenSSH 2.9.0 and later
#  -f:  sshd config file     : OpenSSH 1.2.1 and later
#  -D:  no daemon forking    : OpenSSH 2.5.0 and later
#  -o:  command-line option  : OpenSSH 3.1.0 and later
#  -t:  test config file     : OpenSSH 2.9.9 and later
#  -?:  sshd version info    : OpenSSH 1.2.1 and later
#
#  -e:  log stderr           : SunSSH 1.0.0 and later
#  -f:  sshd config file     : SunSSH 1.0.0 and later
#  -D:  no daemon forking    : SunSSH 1.0.0 and later
#  -o:  command-line option  : SunSSH 1.0.0 and later
#  -t:  test config file     : SunSSH 1.0.0 and later
#  -?:  sshd version info    : SunSSH 1.0.0 and later


#***************************************************************************
# Verify minimum ssh daemon version
#
if((($sshdid =~ /OpenSSH/) && ($sshdvernum < 299)) ||
   (($sshdid =~ /SunSSH/)  && ($sshdvernum < 100))) {
    logmsg 'SCP and SFTP tests require OpenSSH 2.9.9 or later';
    exit 1;
}


#***************************************************************************
# Find out sftp server plugin canonical file name
#
my $sftpsrv = find_sftpsrv();
if(!$sftpsrv) {
    logmsg "cannot find $sftpsrvexe";
    exit 1;
}
logmsg "sftp server plugin found $sftpsrv" if($verbose);


#***************************************************************************
# Find out sftp client canonical file name
#
my $sftp = find_sftp();
if(!$sftp) {
    logmsg "cannot find $sftpexe";
    exit 1;
}
logmsg "sftp client found $sftp" if($verbose);


#***************************************************************************
# Find out ssh keygen canonical file name
#
my $sshkeygen = find_sshkeygen();
if(!$sshkeygen) {
    logmsg "cannot find $sshkeygenexe";
    exit 1;
}
logmsg "ssh keygen found $sshkeygen" if($verbose);


#***************************************************************************
# Find out ssh client canonical file name
#
my $ssh = find_ssh();
if(!$ssh) {
    logmsg "cannot find $sshexe";
    exit 1;
}


#***************************************************************************
# Find out ssh client version info
#
my ($sshid, $sshvernum, $sshverstr, $ssherror) = sshversioninfo($ssh);
if(!$sshid) {
    # Not an OpenSSH or SunSSH ssh client
    logmsg $ssherror if($verbose);
    logmsg 'SCP and SFTP tests require OpenSSH 2.9.9 or later';
    exit 1;
}
logmsg "ssh client found $ssh is $sshverstr" if($verbose);


#***************************************************************************
#  ssh client command line options we might use and version support
#
#  -D:  dynamic app port forwarding  : OpenSSH 2.9.9 and later
#  -F:  ssh config file              : OpenSSH 2.9.9 and later
#  -N:  no shell/command             : OpenSSH 2.1.0 and later
#  -p:  connection port              : OpenSSH 1.2.1 and later
#  -v:  verbose messages             : OpenSSH 1.2.1 and later
# -vv:  increase verbosity           : OpenSSH 2.3.0 and later
#  -V:  ssh version info             : OpenSSH 1.2.1 and later
#
#  -D:  dynamic app port forwarding  : SunSSH 1.0.0 and later
#  -F:  ssh config file              : SunSSH 1.0.0 and later
#  -N:  no shell/command             : SunSSH 1.0.0 and later
#  -p:  connection port              : SunSSH 1.0.0 and later
#  -v:  verbose messages             : SunSSH 1.0.0 and later
# -vv:  increase verbosity           : SunSSH 1.0.0 and later
#  -V:  ssh version info             : SunSSH 1.0.0 and later


#***************************************************************************
# Verify minimum ssh client version
#
if((($sshid =~ /OpenSSH/) && ($sshvernum < 299)) ||
   (($sshid =~ /SunSSH/)  && ($sshvernum < 100))) {
    logmsg 'SCP and SFTP tests require OpenSSH 2.9.9 or later';
    exit 1;
}


#***************************************************************************
#  ssh keygen command line options we actually use and version support
#
#  -C:  identity comment : OpenSSH 1.2.1 and later
#  -f:  key filename     : OpenSSH 1.2.1 and later
#  -N:  new passphrase   : OpenSSH 1.2.1 and later
#  -q:  quiet keygen     : OpenSSH 1.2.1 and later
#  -t:  key type         : OpenSSH 2.5.0 and later
#
#  -C:  identity comment : SunSSH 1.0.0 and later
#  -f:  key filename     : SunSSH 1.0.0 and later
#  -N:  new passphrase   : SunSSH 1.0.0 and later
#  -q:  quiet keygen     : SunSSH 1.0.0 and later
#  -t:  key type         : SunSSH 1.0.0 and later


#***************************************************************************
# Generate host and client key files for curl's tests
#
if((! -e $hstprvkeyf) || (! -s $hstprvkeyf) ||
   (! -e $hstpubkeyf) || (! -s $hstpubkeyf) ||
   (! -e $hstpubmd5f) || (! -s $hstpubmd5f) ||
   (! -e $cliprvkeyf) || (! -s $cliprvkeyf) ||
   (! -e $clipubkeyf) || (! -s $clipubkeyf)) {
    # Make sure all files are gone so ssh-keygen doesn't complain
    unlink($hstprvkeyf, $hstpubkeyf, $hstpubmd5f, $cliprvkeyf, $clipubkeyf);
    logmsg 'generating host keys...' if($verbose);
    if(system "\"$sshkeygen\" -q -t rsa -f $hstprvkeyf -C 'curl test server' -N ''") {
        logmsg 'Could not generate host key';
        exit 1;
    }
    logmsg 'generating client keys...' if($verbose);
    if(system "\"$sshkeygen\" -q -t rsa -f $cliprvkeyf -C 'curl test client' -N ''") {
        logmsg 'Could not generate client key';
        exit 1;
    }
    # Make sure that permissions are restricted so openssh doesn't complain
    system "chmod 600 $hstprvkeyf";
    system "chmod 600 $cliprvkeyf";
    # Save md5 hash of public host key
    open(RSAKEYFILE, "<$hstpubkeyf");
    my @rsahostkey = do { local $/ = ' '; <RSAKEYFILE> };
    close(RSAKEYFILE);
    if(!$rsahostkey[1]) {
        logmsg 'Failed parsing base64 encoded RSA host key';
        exit 1;
    }
    open(PUBMD5FILE, ">$hstpubmd5f");
    print PUBMD5FILE md5_hex(decode_base64($rsahostkey[1]));
    close(PUBMD5FILE);
    if((! -e $hstpubmd5f) || (! -s $hstpubmd5f)) {
        logmsg 'Failed writing md5 hash of RSA host key';
        exit 1;
    }
}


#***************************************************************************
# Convert paths for curl's tests running on Windows with Cygwin/Msys OpenSSH
#
my $clipubkeyf_config = abs_path("$path/$clipubkeyf");
my $hstprvkeyf_config = abs_path("$path/$hstprvkeyf");
my $pidfile_config = $pidfile;
my $sftpsrv_config = $sftpsrv;

if (pathhelp::os_is_win()) {
    # Ensure to use MinGW/Cygwin paths
    $clipubkeyf_config = pathhelp::build_sys_abs_path($clipubkeyf_config);
    $hstprvkeyf_config = pathhelp::build_sys_abs_path($hstprvkeyf_config);
    $pidfile_config = pathhelp::build_sys_abs_path($pidfile_config);
    $sftpsrv_config = "internal-sftp";
}
if ($sshdid =~ /OpenSSH-Windows/) {
    # Ensure to use native Windows paths with OpenSSH for Windows
    $clipubkeyf_config = pathhelp::sys_native_abs_path($clipubkeyf);
    $hstprvkeyf_config = pathhelp::sys_native_abs_path($hstprvkeyf);
    $pidfile_config = pathhelp::sys_native_abs_path($pidfile);
    $sftpsrv_config = pathhelp::sys_native_abs_path($sftpsrv);

    $sshdconfig = pathhelp::sys_native_abs_path($sshdconfig);
    $sshconfig = pathhelp::sys_native_abs_path($sshconfig);
    $sftpconfig = pathhelp::sys_native_abs_path($sftpconfig);
}

#***************************************************************************
#  ssh daemon configuration file options we might use and version support
#
#  AFSTokenPassing                  : OpenSSH 1.2.1 and later [1]
#  AcceptEnv                        : OpenSSH 3.9.0 and later
#  AddressFamily                    : OpenSSH 4.0.0 and later
#  AllowGroups                      : OpenSSH 1.2.1 and later
#  AllowTcpForwarding               : OpenSSH 2.3.0 and later
#  AllowUsers                       : OpenSSH 1.2.1 and later
#  AuthorizedKeysFile               : OpenSSH 2.9.9 and later
#  AuthorizedKeysFile2              : OpenSSH 2.9.9 and later
#  Banner                           : OpenSSH 2.5.0 and later
#  ChallengeResponseAuthentication  : OpenSSH 2.5.0 and later
#  Ciphers                          : OpenSSH 2.1.0 and later [3]
#  ClientAliveCountMax              : OpenSSH 2.9.0 and later
#  ClientAliveInterval              : OpenSSH 2.9.0 and later
#  Compression                      : OpenSSH 3.3.0 and later
#  DenyGroups                       : OpenSSH 1.2.1 and later
#  DenyUsers                        : OpenSSH 1.2.1 and later
#  ForceCommand                     : OpenSSH 4.4.0 and later [3]
#  GatewayPorts                     : OpenSSH 2.1.0 and later
#  GSSAPIAuthentication             : OpenSSH 3.7.0 and later [1]
#  GSSAPICleanupCredentials         : OpenSSH 3.8.0 and later [1]
#  GSSAPIKeyExchange                :  SunSSH 1.0.0 and later [1]
#  GSSAPIStoreDelegatedCredentials  :  SunSSH 1.0.0 and later [1]
#  GSSCleanupCreds                  :  SunSSH 1.0.0 and later [1]
#  GSSUseSessionCredCache           :  SunSSH 1.0.0 and later [1]
#  HostbasedAuthentication          : OpenSSH 2.9.0 and later
#  HostbasedUsesNameFromPacketOnly  : OpenSSH 2.9.0 and later
#  HostKey                          : OpenSSH 1.2.1 and later
#  IgnoreRhosts                     : OpenSSH 1.2.1 and later
#  IgnoreUserKnownHosts             : OpenSSH 1.2.1 and later
#  KbdInteractiveAuthentication     : OpenSSH 2.3.0 and later
#  KeepAlive                        : OpenSSH 1.2.1 and later
#  KerberosAuthentication           : OpenSSH 1.2.1 and later [1]
#  KerberosGetAFSToken              : OpenSSH 3.8.0 and later [1]
#  KerberosOrLocalPasswd            : OpenSSH 1.2.1 and later [1]
#  KerberosTgtPassing               : OpenSSH 1.2.1 and later [1]
#  KerberosTicketCleanup            : OpenSSH 1.2.1 and later [1]
#  KeyRegenerationInterval          : OpenSSH 1.2.1 and later
#  ListenAddress                    : OpenSSH 1.2.1 and later
#  LoginGraceTime                   : OpenSSH 1.2.1 and later
#  LogLevel                         : OpenSSH 1.2.1 and later
#  LookupClientHostnames            :  SunSSH 1.0.0 and later
#  MACs                             : OpenSSH 2.5.0 and later [3]
#  Match                            : OpenSSH 4.4.0 and later [3]
#  MaxAuthTries                     : OpenSSH 3.9.0 and later
#  MaxStartups                      : OpenSSH 2.2.0 and later
#  PAMAuthenticationViaKbdInt       : OpenSSH 2.9.0 and later [2]
#  PasswordAuthentication           : OpenSSH 1.2.1 and later
#  PermitEmptyPasswords             : OpenSSH 1.2.1 and later
#  PermitOpen                       : OpenSSH 4.4.0 and later [3]
#  PermitRootLogin                  : OpenSSH 1.2.1 and later
#  PermitTunnel                     : OpenSSH 4.3.0 and later
#  PermitUserEnvironment            : OpenSSH 3.5.0 and later
#  PidFile                          : OpenSSH 2.1.0 and later
#  Port                             : OpenSSH 1.2.1 and later
#  PrintLastLog                     : OpenSSH 2.9.0 and later
#  PrintMotd                        : OpenSSH 1.2.1 and later
#  Protocol                         : OpenSSH 2.1.0 and later
#  PubkeyAuthentication             : OpenSSH 2.5.0 and later
#  RhostsAuthentication             : OpenSSH 1.2.1 and later
#  RhostsRSAAuthentication          : OpenSSH 1.2.1 and later
#  RSAAuthentication                : OpenSSH 1.2.1 and later
#  ServerKeyBits                    : OpenSSH 1.2.1 and later
#  SkeyAuthentication               : OpenSSH 1.2.1 and later [1]
#  StrictModes                      : OpenSSH 1.2.1 and later
#  Subsystem                        : OpenSSH 2.2.0 and later
#  SyslogFacility                   : OpenSSH 1.2.1 and later
#  TCPKeepAlive                     : OpenSSH 3.8.0 and later
#  UseDNS                           : OpenSSH 3.7.0 and later
#  UseLogin                         : OpenSSH 1.2.1 and later
#  UsePAM                           : OpenSSH 3.7.0 and later [1][2]
#  UsePrivilegeSeparation           : OpenSSH 3.2.2 and later
#  VerifyReverseMapping             : OpenSSH 3.1.0 and later
#  X11DisplayOffset                 : OpenSSH 1.2.1 and later [3]
#  X11Forwarding                    : OpenSSH 1.2.1 and later
#  X11UseLocalhost                  : OpenSSH 3.1.0 and later
#  XAuthLocation                    : OpenSSH 2.1.1 and later [3]
#
#  [1] Option only available if activated at compile time
#  [2] Option specific for portable versions
#  [3] Option not used in our ssh server config file


#***************************************************************************
# Initialize sshd config with options actually supported in OpenSSH 2.9.9
#
logmsg 'generating ssh server config file...' if($verbose);
@cfgarr = ();
push @cfgarr, '# This is a generated file.  Do not edit.';
push @cfgarr, "# $sshdverstr sshd configuration file for curl testing";
push @cfgarr, '#';

# AllowUsers and DenyUsers options should use lowercase on Windows
# and do not support quotes around values for some unknown reason.
if ($sshdid =~ /OpenSSH-Windows/) {
    my $username_lc = lc $username;
    push @cfgarr, "DenyUsers !$username_lc";
    push @cfgarr, "AllowUsers $username_lc";
} else {
    push @cfgarr, "DenyUsers !$username";
    push @cfgarr, "AllowUsers $username";
}

push @cfgarr, 'DenyGroups';
push @cfgarr, 'AllowGroups';
push @cfgarr, '#';
push @cfgarr, "AuthorizedKeysFile $clipubkeyf_config";
push @cfgarr, "AuthorizedKeysFile2 $clipubkeyf_config";
push @cfgarr, "HostKey $hstprvkeyf_config";
if ($sshdid !~ /OpenSSH-Windows/) {
    push @cfgarr, "PidFile $pidfile_config";
}
push @cfgarr, '#';
push @cfgarr, "Port $port";
push @cfgarr, "ListenAddress $listenaddr";
push @cfgarr, 'Protocol 2';
push @cfgarr, '#';
push @cfgarr, 'AllowTcpForwarding yes';
push @cfgarr, 'Banner none';
push @cfgarr, 'ChallengeResponseAuthentication no';
push @cfgarr, 'ClientAliveCountMax 3';
push @cfgarr, 'ClientAliveInterval 0';
push @cfgarr, 'GatewayPorts no';
push @cfgarr, 'HostbasedAuthentication no';
push @cfgarr, 'HostbasedUsesNameFromPacketOnly no';
push @cfgarr, 'IgnoreRhosts yes';
push @cfgarr, 'IgnoreUserKnownHosts yes';
push @cfgarr, 'KeyRegenerationInterval 0';
push @cfgarr, 'LoginGraceTime 30';
push @cfgarr, "LogLevel $loglevel";
push @cfgarr, 'MaxStartups 5';
push @cfgarr, 'PasswordAuthentication no';
push @cfgarr, 'PermitEmptyPasswords no';
push @cfgarr, 'PermitRootLogin no';
push @cfgarr, 'PrintLastLog no';
push @cfgarr, 'PrintMotd no';
push @cfgarr, 'PubkeyAuthentication yes';
push @cfgarr, 'RhostsRSAAuthentication no';
push @cfgarr, 'RSAAuthentication no';
push @cfgarr, 'ServerKeyBits 768';
push @cfgarr, 'StrictModes no';
push @cfgarr, "Subsystem sftp \"$sftpsrv_config\"";
push @cfgarr, 'SyslogFacility AUTH';
push @cfgarr, 'UseLogin no';
push @cfgarr, 'X11Forwarding no';
push @cfgarr, '#';


#***************************************************************************
# Write out initial sshd configuration file for curl's tests
#
$error = dump_array($sshdconfig, @cfgarr);
if($error) {
    logmsg $error;
    exit 1;
}


#***************************************************************************
# Verifies at run time if sshd supports a given configuration file option
#
sub sshd_supports_opt {
    my ($option, $value) = @_;
    my $err;
    #
    if((($sshdid =~ /OpenSSH/) && ($sshdvernum >= 310)) ||
        ($sshdid =~ /SunSSH/)) {
        # ssh daemon supports command line options -t -f and -o
        $err = grep /((Unsupported)|(Bad configuration)|(Deprecated)) option.*$option/,
                    qx("$sshd" -t -f $sshdconfig -o "$option=$value" 2>&1);
        return !$err;
    }
    if(($sshdid =~ /OpenSSH/) && ($sshdvernum >= 299)) {
        # ssh daemon supports command line options -t and -f
        $err = dump_array($sshdconfig, (@cfgarr, "$option $value"));
        if($err) {
            logmsg $err;
            return 0;
        }
        $err = grep /((Unsupported)|(Bad configuration)|(Deprecated)) option.*$option/,
                    qx("$sshd" -t -f $sshdconfig 2>&1);
        unlink $sshdconfig;
        return !$err;
    }
    return 0;
}


#***************************************************************************
# Kerberos Authentication support may have not been built into sshd
#
if(sshd_supports_opt('KerberosAuthentication','no')) {
    push @cfgarr, 'KerberosAuthentication no';
}
if(sshd_supports_opt('KerberosGetAFSToken','no')) {
    push @cfgarr, 'KerberosGetAFSToken no';
}
if(sshd_supports_opt('KerberosOrLocalPasswd','no')) {
    push @cfgarr, 'KerberosOrLocalPasswd no';
}
if(sshd_supports_opt('KerberosTgtPassing','no')) {
    push @cfgarr, 'KerberosTgtPassing no';
}
if(sshd_supports_opt('KerberosTicketCleanup','yes')) {
    push @cfgarr, 'KerberosTicketCleanup yes';
}


#***************************************************************************
# Andrew File System support may have not been built into sshd
#
if(sshd_supports_opt('AFSTokenPassing','no')) {
    push @cfgarr, 'AFSTokenPassing no';
}


#***************************************************************************
# S/Key authentication support may have not been built into sshd
#
if(sshd_supports_opt('SkeyAuthentication','no')) {
    push @cfgarr, 'SkeyAuthentication no';
}


#***************************************************************************
# GSSAPI Authentication support may have not been built into sshd
#
my $sshd_builtwith_GSSAPI;
if(sshd_supports_opt('GSSAPIAuthentication','no')) {
    push @cfgarr, 'GSSAPIAuthentication no';
    $sshd_builtwith_GSSAPI = 1;
}
if(sshd_supports_opt('GSSAPICleanupCredentials','yes')) {
    push @cfgarr, 'GSSAPICleanupCredentials yes';
}
if(sshd_supports_opt('GSSAPIKeyExchange','no')) {
    push @cfgarr, 'GSSAPIKeyExchange no';
}
if(sshd_supports_opt('GSSAPIStoreDelegatedCredentials','no')) {
    push @cfgarr, 'GSSAPIStoreDelegatedCredentials no';
}
if(sshd_supports_opt('GSSCleanupCreds','yes')) {
    push @cfgarr, 'GSSCleanupCreds yes';
}
if(sshd_supports_opt('GSSUseSessionCredCache','no')) {
    push @cfgarr, 'GSSUseSessionCredCache no';
}
push @cfgarr, '#';


#***************************************************************************
# Options that might be supported or not in sshd OpenSSH 2.9.9 and later
#
if(sshd_supports_opt('AcceptEnv','')) {
    push @cfgarr, 'AcceptEnv';
}
if(sshd_supports_opt('AddressFamily','any')) {
    # Address family must be specified before ListenAddress
    splice @cfgarr, 14, 0, 'AddressFamily any';
}
if(sshd_supports_opt('Compression','no')) {
    push @cfgarr, 'Compression no';
}
if(sshd_supports_opt('KbdInteractiveAuthentication','no')) {
    push @cfgarr, 'KbdInteractiveAuthentication no';
}
if(sshd_supports_opt('KeepAlive','no')) {
    push @cfgarr, 'KeepAlive no';
}
if(sshd_supports_opt('LookupClientHostnames','no')) {
    push @cfgarr, 'LookupClientHostnames no';
}
if(sshd_supports_opt('MaxAuthTries','10')) {
    push @cfgarr, 'MaxAuthTries 10';
}
if(sshd_supports_opt('PAMAuthenticationViaKbdInt','no')) {
    push @cfgarr, 'PAMAuthenticationViaKbdInt no';
}
if(sshd_supports_opt('PermitTunnel','no')) {
    push @cfgarr, 'PermitTunnel no';
}
if(sshd_supports_opt('PermitUserEnvironment','no')) {
    push @cfgarr, 'PermitUserEnvironment no';
}
if(sshd_supports_opt('RhostsAuthentication','no')) {
    push @cfgarr, 'RhostsAuthentication no';
}
if(sshd_supports_opt('TCPKeepAlive','no')) {
    push @cfgarr, 'TCPKeepAlive no';
}
if(sshd_supports_opt('UseDNS','no')) {
    push @cfgarr, 'UseDNS no';
}
if(sshd_supports_opt('UsePAM','no')) {
    push @cfgarr, 'UsePAM no';
}

if($sshdid =~ /OpenSSH/) {
    # http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6492415
    if(sshd_supports_opt('UsePrivilegeSeparation','no')) {
        push @cfgarr, 'UsePrivilegeSeparation no';
    }
}

if(sshd_supports_opt('VerifyReverseMapping','no')) {
    push @cfgarr, 'VerifyReverseMapping no';
}
if(sshd_supports_opt('X11UseLocalhost','yes')) {
    push @cfgarr, 'X11UseLocalhost yes';
}
push @cfgarr, '#';


#***************************************************************************
# Write out resulting sshd configuration file for curl's tests
#
$error = dump_array($sshdconfig, @cfgarr);
if($error) {
    logmsg $error;
    exit 1;
}


#***************************************************************************
# Verify that sshd actually supports our generated configuration file
#
if(system "\"$sshd\" -t -f $sshdconfig > $sshdlog 2>&1") {
    logmsg "sshd configuration file $sshdconfig failed verification";
    display_sshdlog();
    display_sshdconfig();
    exit 1;
}


#***************************************************************************
# Generate ssh client host key database file for curl's tests
#
if((! -e $knownhosts) || (! -s $knownhosts)) {
    logmsg 'generating ssh client known hosts file...' if($verbose);
    unlink($knownhosts);
    if(open(RSAKEYFILE, "<$hstpubkeyf")) {
        my @rsahostkey = do { local $/ = ' '; <RSAKEYFILE> };
        if(close(RSAKEYFILE)) {
            if(open(KNOWNHOSTS, ">$knownhosts")) {
                print KNOWNHOSTS "$listenaddr ssh-rsa $rsahostkey[1]\n";
                if(!close(KNOWNHOSTS)) {
                    $error = "Error: cannot close file $knownhosts";
                }
            }
            else {
                $error = "Error: cannot write file $knownhosts";
            }
        }
        else {
            $error = "Error: cannot close file $hstpubkeyf";
        }
    }
    else {
        $error = "Error: cannot read file $hstpubkeyf";
    }
    if($error) {
        logmsg $error;
        exit 1;
    }
}


#***************************************************************************
# Convert paths for curl's tests running on Windows using Cygwin OpenSSH
#
my $identity_config = abs_path("$path/$identity");
my $knownhosts_config = abs_path("$path/$knownhosts");

if (pathhelp::os_is_win()) {
    # Ensure to use MinGW/Cygwin paths
    $identity_config = pathhelp::build_sys_abs_path($identity_config);
    $knownhosts_config = pathhelp::build_sys_abs_path($knownhosts_config);
}
if ($sshdid =~ /OpenSSH-Windows/) {
    # Ensure to use native Windows paths with OpenSSH for Windows
    $identity_config = pathhelp::sys_native_abs_path($identity);
    $knownhosts_config = pathhelp::sys_native_abs_path($knownhosts);
}

#***************************************************************************
#  ssh client configuration file options we might use and version support
#
#  AddressFamily                     : OpenSSH 3.7.0 and later
#  BatchMode                         : OpenSSH 1.2.1 and later
#  BindAddress                       : OpenSSH 2.9.9 and later
#  ChallengeResponseAuthentication   : OpenSSH 2.5.0 and later
#  CheckHostIP                       : OpenSSH 1.2.1 and later
#  Cipher                            : OpenSSH 1.2.1 and later [3]
#  Ciphers                           : OpenSSH 2.1.0 and later [3]
#  ClearAllForwardings               : OpenSSH 2.9.9 and later
#  Compression                       : OpenSSH 1.2.1 and later
#  CompressionLevel                  : OpenSSH 1.2.1 and later [3]
#  ConnectionAttempts                : OpenSSH 1.2.1 and later
#  ConnectTimeout                    : OpenSSH 3.7.0 and later
#  ControlMaster                     : OpenSSH 3.9.0 and later
#  ControlPath                       : OpenSSH 3.9.0 and later
#  DisableBanner                     :  SunSSH 1.2.0 and later
#  DynamicForward                    : OpenSSH 2.9.0 and later
#  EnableSSHKeysign                  : OpenSSH 3.6.0 and later
#  EscapeChar                        : OpenSSH 1.2.1 and later [3]
#  ExitOnForwardFailure              : OpenSSH 4.4.0 and later
#  ForwardAgent                      : OpenSSH 1.2.1 and later
#  ForwardX11                        : OpenSSH 1.2.1 and later
#  ForwardX11Trusted                 : OpenSSH 3.8.0 and later
#  GatewayPorts                      : OpenSSH 1.2.1 and later
#  GlobalKnownHostsFile              : OpenSSH 1.2.1 and later
#  GSSAPIAuthentication              : OpenSSH 3.7.0 and later [1]
#  GSSAPIDelegateCredentials         : OpenSSH 3.7.0 and later [1]
#  HashKnownHosts                    : OpenSSH 4.0.0 and later
#  Host                              : OpenSSH 1.2.1 and later
#  HostbasedAuthentication           : OpenSSH 2.9.0 and later
#  HostKeyAlgorithms                 : OpenSSH 2.9.0 and later [3]
#  HostKeyAlias                      : OpenSSH 2.5.0 and later [3]
#  HostName                          : OpenSSH 1.2.1 and later
#  IdentitiesOnly                    : OpenSSH 3.9.0 and later
#  IdentityFile                      : OpenSSH 1.2.1 and later
#  IgnoreIfUnknown                   :  SunSSH 1.2.0 and later
#  KeepAlive                         : OpenSSH 1.2.1 and later
#  KbdInteractiveAuthentication      : OpenSSH 2.3.0 and later
#  KbdInteractiveDevices             : OpenSSH 2.3.0 and later [3]
#  LocalCommand                      : OpenSSH 4.3.0 and later [3]
#  LocalForward                      : OpenSSH 1.2.1 and later [3]
#  LogLevel                          : OpenSSH 1.2.1 and later
#  MACs                              : OpenSSH 2.5.0 and later [3]
#  NoHostAuthenticationForLocalhost  : OpenSSH 3.0.0 and later
#  NumberOfPasswordPrompts           : OpenSSH 1.2.1 and later
#  PasswordAuthentication            : OpenSSH 1.2.1 and later
#  PermitLocalCommand                : OpenSSH 4.3.0 and later
#  Port                              : OpenSSH 1.2.1 and later
#  PreferredAuthentications          : OpenSSH 2.5.2 and later
#  Protocol                          : OpenSSH 2.1.0 and later
#  ProxyCommand                      : OpenSSH 1.2.1 and later [3]
#  PubkeyAuthentication              : OpenSSH 2.5.0 and later
#  RekeyLimit                        : OpenSSH 3.7.0 and later
#  RemoteForward                     : OpenSSH 1.2.1 and later [3]
#  RhostsRSAAuthentication           : OpenSSH 1.2.1 and later
#  RSAAuthentication                 : OpenSSH 1.2.1 and later
#  SendEnv                           : OpenSSH 3.9.0 and later
#  ServerAliveCountMax               : OpenSSH 3.8.0 and later
#  ServerAliveInterval               : OpenSSH 3.8.0 and later
#  SmartcardDevice                   : OpenSSH 2.9.9 and later [1][3]
#  StrictHostKeyChecking             : OpenSSH 1.2.1 and later
#  TCPKeepAlive                      : OpenSSH 3.8.0 and later
#  Tunnel                            : OpenSSH 4.3.0 and later
#  TunnelDevice                      : OpenSSH 4.3.0 and later [3]
#  UsePAM                            : OpenSSH 3.7.0 and later [1][2][3]
#  UsePrivilegedPort                 : OpenSSH 1.2.1 and later
#  User                              : OpenSSH 1.2.1 and later
#  UserKnownHostsFile                : OpenSSH 1.2.1 and later
#  VerifyHostKeyDNS                  : OpenSSH 3.8.0 and later
#  XAuthLocation                     : OpenSSH 2.1.1 and later [3]
#
#  [1] Option only available if activated at compile time
#  [2] Option specific for portable versions
#  [3] Option not used in our ssh client config file


#***************************************************************************
# Initialize ssh config with options actually supported in OpenSSH 2.9.9
#
logmsg 'generating ssh client config file...' if($verbose);
@cfgarr = ();
push @cfgarr, '# This is a generated file.  Do not edit.';
push @cfgarr, "# $sshverstr ssh client configuration file for curl testing";
push @cfgarr, '#';
push @cfgarr, 'Host *';
push @cfgarr, '#';
push @cfgarr, "Port $port";
push @cfgarr, "HostName $listenaddr";
push @cfgarr, "User $username";
push @cfgarr, 'Protocol 2';
push @cfgarr, '#';

# BindAddress option is not supported by OpenSSH for Windows
if (!($sshdid =~ /OpenSSH-Windows/)) {
    push @cfgarr, "BindAddress $listenaddr";
}

push @cfgarr, '#';
push @cfgarr, "IdentityFile $identity_config";
push @cfgarr, "UserKnownHostsFile $knownhosts_config";
push @cfgarr, '#';
push @cfgarr, 'BatchMode yes';
push @cfgarr, 'ChallengeResponseAuthentication no';
push @cfgarr, 'CheckHostIP no';
push @cfgarr, 'ClearAllForwardings no';
push @cfgarr, 'Compression no';
push @cfgarr, 'ConnectionAttempts 3';
push @cfgarr, 'ForwardAgent no';
push @cfgarr, 'ForwardX11 no';
push @cfgarr, 'GatewayPorts no';
push @cfgarr, 'GlobalKnownHostsFile /dev/null';
push @cfgarr, 'HostbasedAuthentication no';
push @cfgarr, 'KbdInteractiveAuthentication no';
push @cfgarr, "LogLevel $loglevel";
push @cfgarr, 'NumberOfPasswordPrompts 0';
push @cfgarr, 'PasswordAuthentication no';
push @cfgarr, 'PreferredAuthentications publickey';
push @cfgarr, 'PubkeyAuthentication yes';

# RSA authentication options are not supported by OpenSSH for Windows
if (!($sshdid =~ /OpenSSH-Windows/)) {
    push @cfgarr, 'RhostsRSAAuthentication no';
    push @cfgarr, 'RSAAuthentication no';
}

# Disabled StrictHostKeyChecking since it makes the tests fail on my
# OpenSSH_6.0p1 on Debian Linux / Daniel
push @cfgarr, 'StrictHostKeyChecking no';
push @cfgarr, 'UsePrivilegedPort no';
push @cfgarr, '#';


#***************************************************************************
# Options supported in ssh client newer than OpenSSH 2.9.9
#

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 370)) {
    push @cfgarr, 'AddressFamily any';
}

if((($sshid =~ /OpenSSH/) && ($sshvernum >= 370)) ||
   (($sshid =~ /SunSSH/) && ($sshvernum >= 120))) {
    push @cfgarr, 'ConnectTimeout 30';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 390)) {
    push @cfgarr, 'ControlMaster no';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 420)) {
    push @cfgarr, 'ControlPath none';
}

if(($sshid =~ /SunSSH/) && ($sshvernum >= 120)) {
    push @cfgarr, 'DisableBanner yes';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 360)) {
    push @cfgarr, 'EnableSSHKeysign no';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 440)) {
    push @cfgarr, 'ExitOnForwardFailure yes';
}

if((($sshid =~ /OpenSSH/) && ($sshvernum >= 380)) ||
   (($sshid =~ /SunSSH/) && ($sshvernum >= 120))) {
    push @cfgarr, 'ForwardX11Trusted no';
}

if(($sshd_builtwith_GSSAPI) && ($sshdid eq $sshid) &&
   ($sshdvernum == $sshvernum)) {
    push @cfgarr, 'GSSAPIAuthentication no';
    push @cfgarr, 'GSSAPIDelegateCredentials no';
    if($sshid =~ /SunSSH/) {
        push @cfgarr, 'GSSAPIKeyExchange no';
    }
}

if((($sshid =~ /OpenSSH/) && ($sshvernum >= 400)) ||
   (($sshid =~ /SunSSH/) && ($sshvernum >= 120))) {
    push @cfgarr, 'HashKnownHosts no';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 390)) {
    push @cfgarr, 'IdentitiesOnly yes';
}

if(($sshid =~ /SunSSH/) && ($sshvernum >= 120)) {
    push @cfgarr, 'IgnoreIfUnknown no';
}

if((($sshid =~ /OpenSSH/) && ($sshvernum < 380)) ||
    ($sshid =~ /SunSSH/)) {
    push @cfgarr, 'KeepAlive no';
}

if((($sshid =~ /OpenSSH/) && ($sshvernum >= 300)) ||
    ($sshid =~ /SunSSH/)) {
    push @cfgarr, 'NoHostAuthenticationForLocalhost no';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 430)) {
    push @cfgarr, 'PermitLocalCommand no';
}

if((($sshid =~ /OpenSSH/) && ($sshvernum >= 370)) ||
   (($sshid =~ /SunSSH/) && ($sshvernum >= 120))) {
    push @cfgarr, 'RekeyLimit 1G';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 390)) {
    push @cfgarr, 'SendEnv';
}

if((($sshid =~ /OpenSSH/) && ($sshvernum >= 380)) ||
   (($sshid =~ /SunSSH/) && ($sshvernum >= 120))) {
    push @cfgarr, 'ServerAliveCountMax 3';
    push @cfgarr, 'ServerAliveInterval 0';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 380)) {
    push @cfgarr, 'TCPKeepAlive no';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 430)) {
    push @cfgarr, 'Tunnel no';
}

if(($sshid =~ /OpenSSH/) && ($sshvernum >= 380)) {
    push @cfgarr, 'VerifyHostKeyDNS no';
}

push @cfgarr, '#';


#***************************************************************************
# Write out resulting ssh client configuration file for curl's tests
#
$error = dump_array($sshconfig, @cfgarr);
if($error) {
    logmsg $error;
    exit 1;
}


#***************************************************************************
# Initialize client sftp config with options actually supported.
#
logmsg 'generating sftp client config file...' if($verbose);
splice @cfgarr, 1, 1, "# $sshverstr sftp client configuration file for curl testing";
#
for(my $i = scalar(@cfgarr) - 1; $i > 0; $i--) {
    if($cfgarr[$i] =~ /^DynamicForward/) {
        splice @cfgarr, $i, 1;
        next;
    }
    if($cfgarr[$i] =~ /^ClearAllForwardings/) {
        splice @cfgarr, $i, 1, "ClearAllForwardings yes";
        next;
    }
}


#***************************************************************************
# Write out resulting sftp client configuration file for curl's tests
#
$error = dump_array($sftpconfig, @cfgarr);
if($error) {
    logmsg $error;
    exit 1;
}
@cfgarr = ();


#***************************************************************************
# Generate client sftp commands batch file for sftp server verification
#
logmsg 'generating sftp client commands file...' if($verbose);
push @cfgarr, 'pwd';
push @cfgarr, 'quit';
$error = dump_array($sftpcmds, @cfgarr);
if($error) {
    logmsg $error;
    exit 1;
}
@cfgarr = ();

#***************************************************************************
# Prepare command line of ssh server daemon
#
my $cmd = "\"$sshd\" -e -D -f $sshdconfig > $sshdlog 2>&1";
logmsg "SCP/SFTP server listening on port $port" if($verbose);
logmsg "RUN: $cmd" if($verbose);

#***************************************************************************
# Start the ssh server daemon on Windows without forking it
#
if ($sshdid =~ /OpenSSH-Windows/) {
    # Fake pidfile for ssh server on Windows.
    if(open(OUT, ">$pidfile")) {
        print OUT $$ . "\n";
        close(OUT);
    }

    # Put an "exec" in front of the command so that the child process
    # keeps this child's process ID by being tied to the spawned shell.
    exec("exec $cmd") || die "Can't exec() $cmd: $!";
    # exec() will create a new process, but ties the existence of the
    # new process to the parent waiting perl.exe and sh.exe processes.

    # exec() should never return back here to this process. We protect
    # ourselves by calling die() just in case something goes really bad.
    die "error: exec() has returned";
}

#***************************************************************************
# Start the ssh server daemon without forking it
#
my $rc = system($cmd);
if($rc == -1) {
    logmsg "\"$sshd\" failed with: $!";
}
elsif($rc & 127) {
    logmsg sprintf("\"$sshd\" died with signal %d, and %s coredump",
                   ($rc & 127), ($rc & 128)?'a':'no');
}
elsif($verbose && ($rc >> 8)) {
    logmsg sprintf("\"$sshd\" exited with %d", $rc >> 8);
}


#***************************************************************************
# Clean up once the server has stopped
#
unlink($hstprvkeyf, $hstpubkeyf, $hstpubmd5f,
       $cliprvkeyf, $clipubkeyf, $knownhosts,
       $sshdconfig, $sshconfig, $sftpconfig);

exit 0;