aboutsummaryrefslogtreecommitdiff
path: root/tests/sshserver.pl
blob: 79fcd995bc82d347c5dabb7e7f6eec86a1a29700 (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
#/usr/bin/env perl
# $Id$
# Starts sshd for use in the SCP, SFTP and SOCKS curl test harness tests.
# Also creates the ssh configuration files (this could be moved to a
# separate script).

# Options:
# -u user
# -v
# target_port

use strict;
use File::Spec;

my $verbose=0; # set to 1 for debugging

my $port = 8999;        # just our default, weird enough
my $listenaddr = "127.0.0.1"; # address on which to listen

my $path = `pwd`;
chomp $path;

my $exeext;
if ($^O eq 'MSWin32' || $^O eq 'cygwin' || $^O eq 'msys' || $^O eq 'dos' || $^O eq 'os2') {
    $exeext = '.exe';
}

# Where to look for sftp-server
my @sftppath = qw(
    /usr/lib/openssh
    /usr/libexec/openssh
    /usr/libexec
    /usr/local/libexec
    /opt/local/libexec
    /usr/lib/ssh
    /usr/libexec/ssh
    /usr/sbin
    /usr/lib
    /usr/lib/ssh/openssh
    /usr/lib64/ssh
    /usr/lib64/misc
    /usr/lib/misc
    /usr/local/sbin
    /usr/freeware/bin
    /opt/ssh/sbin
    /opt/ssh/libexec
    );

my $username = $ENV{USER};

# Find a file somewhere in the given path
sub searchpath {
  my $fn = $_[0] . $exeext;
  shift;
  my @path = @_;
  foreach (@path) {
      my $file = File::Spec->catfile($_, $fn);
      if (-e $file) {
          return $file;
      }
  }
}

# Parse options
do {
    if($ARGV[0] eq "-v") {
        $verbose=1;
    }
    elsif($ARGV[0] eq "-u") {
        $username=$ARGV[1];
        shift @ARGV;
    }
    elsif($ARGV[0] eq "-l") {
        $listenaddr=$ARGV[1];
        shift @ARGV;
    }
    elsif($ARGV[0] =~ /^(\d+)$/) {
        $port = $1;
    }
} while(shift @ARGV);

my $conffile="curl_sshd_config";    # sshd configuration data
my $conffile_ssh="curl_ssh_config";    # ssh configuration data
my $knownhostsfile="curl_client_knownhosts";    # ssh knownhosts file

# Searching for sshd and sftp-server will be done first
# in the PATH and afterwards in other common locations.
my @spath;
push(@spath, File::Spec->path()); 
push(@spath, @sftppath); 

# sshd insists on being called with an absolute path.
my $sshd = searchpath("sshd", @spath);
if (!$sshd) {
    print "sshd$exeext not found\n";
    exit 1;
}
if ($verbose) {
    print STDERR "SSH server found at $sshd\n";
}

my $sftp = searchpath("sftp-server", @spath);
if (!$sftp) {
    print "Could not find sftp-server$exeext plugin\n";
    exit 1;
}
if ($verbose) {
    print STDERR "SFTP server plugin found at $sftp\n";
}

if ($username eq "root") {
    print "Will not run ssh daemon as root to mitigate security risks\n";
    exit 1;
}

# Find out sshd version.
my $tmpstr;
my $ssh_daemon;
my $ssh_ver_major;
my $ssh_ver_minor;
my $ssh_ver_patch;
chomp($tmpstr = qx($sshd -V 2>&1 | grep OpenSSH));
if ($tmpstr =~ /OpenSSH[_-](\d+)\.(\d+)(\.(\d+))*/) {
    ($ssh_ver_major, $ssh_ver_minor, $ssh_ver_patch) = ($1, $2, $4);
    $ssh_daemon = 'OpenSSH';
}
if ($verbose) {
    print STDERR "ssh_daemon: $ssh_daemon\n";
    print STDERR "ssh_ver_major: $ssh_ver_major\n";
    print STDERR "ssh_ver_minor: $ssh_ver_minor\n";
    print STDERR "ssh_ver_patch: $ssh_ver_patch\n";
}

# Verify minimum OpenSSH version.
if (($ssh_daemon !~ /OpenSSH/) || (10 * $ssh_ver_major + $ssh_ver_minor < 37)) {
    if(!$ssh_daemon) {
        print "SSH server daemon found is not an OpenSSH daemon\n";
    }
    else {
        print "SSH server daemon found is OpenSSH $ssh_ver_major.$ssh_ver_minor\n";
    }
    print "SCP, SFTP and SOCKS tests require OpenSSH 3.7 or later\n";
    exit 1;
}

# Initialize sshd configuration file for curl's tests.
open(CONF, ">$conffile") || die "Could not write $conffile";
print CONF "# This is a generated file!  Do not edit!\n";
print CONF "# OpenSSH sshd configuration file for curl testing\n";
close CONF;

# Support for some options might have not been built into sshd.  On some
# platforms specifying an unsupported option prevents sshd from starting.
# Check here for possible unsupported options, avoiding its use in sshd.
sub sshd_supports_opt($) {
    my ($option) = @_;
    my $err = grep /Unsupported .* $option/, qx($sshd -t -f $conffile -o $option=no 2>&1);
    return !$err;
}

my $supports_UsePAM = sshd_supports_opt('UsePAM');
my $supports_UseDNS = sshd_supports_opt('UseDNS');
my $supports_ChReAu = sshd_supports_opt('ChallengeResponseAuthentication');
if ($verbose) {
    print STDERR "sshd supports UsePAM: ";
    print STDERR $supports_UsePAM ? "yes\n" : "no\n";
    print STDERR "sshd supports UseDNS: ";
    print STDERR $supports_UseDNS ? "yes\n" : "no\n";
    print STDERR "sshd supports ChallengeResponseAuthentication: ";
    print STDERR $supports_ChReAu ? "yes\n" : "no\n";
}

if (! -e "curl_client_key.pub") {
    if ($verbose) {
        print STDERR "Generating host and client keys...\n";
    }
    # Make sure all files are gone so ssh-keygen doesn't complain
    unlink("curl_host_dsa_key", "curl_client_key","curl_host_dsa_key.pub", "curl_client_key.pub"); 
    system "ssh-keygen -q -t dsa -f curl_host_dsa_key -C 'curl test server' -N ''" and die "Could not generate host key";
    system "ssh-keygen -q -t dsa -f curl_client_key -C 'curl test client' -N ''" and die "Could not generate client key";
}

open(FILE, ">>$conffile") || die "Could not write $conffile";
print FILE <<EOFSSHD
AllowUsers $username
DenyUsers
DenyGroups
AuthorizedKeysFile $path/curl_client_key.pub
HostKey $path/curl_host_dsa_key
PidFile $path/.ssh.pid
Port $port
ListenAddress $listenaddr
Protocol 2
AllowTcpForwarding yes
GatewayPorts no
HostbasedAuthentication no
IgnoreRhosts yes
IgnoreUserKnownHosts yes
KeepAlive no
PasswordAuthentication no
PermitEmptyPasswords no
PermitUserEnvironment no
PermitRootLogin no
PrintLastLog no
PrintMotd no
StrictModes no
Subsystem sftp $sftp
UseLogin no
PrintLastLog no
X11Forwarding no
UsePrivilegeSeparation no
# Newer OpenSSH options
EOFSSHD
;
close FILE ||  die "Could not close $conffile";

sub set_sshd_option {
    my ($string) = @_;
    if (open(FILE, ">>$conffile")) {
        print FILE "$string\n";
        close FILE;
    }
}

if ($supports_UsePAM) {
    set_sshd_option('UsePAM no');
}
if ($supports_UseDNS) {
    set_sshd_option('UseDNS no');
}
if ($supports_ChReAu) {
    set_sshd_option('ChallengeResponseAuthentication no');
}


# Now, set up some configuration files for the ssh client
open(DSAKEYFILE, "<curl_host_dsa_key.pub") || die 'Could not read curl_host_dsa_key.pub';
my @dsahostkey = do { local $/ = ' '; <DSAKEYFILE> };
close DSAKEYFILE || die "Could not close DSAKEYFILE";

open(KNOWNHOSTS, ">$knownhostsfile") || die "Could not write $knownhostsfile";
print KNOWNHOSTS "[$listenaddr]:$port ssh-dss $dsahostkey[1]\n" || die 'Could not write to KNOWNHOSTS';
close KNOWNHOSTS || die "Could not close KNOWNHOSTS";

open(SSHFILE, ">$conffile_ssh") || die "Could not write $conffile_ssh";
print SSHFILE <<EOFSSH
IdentityFile $path/curl_client_key
UserKnownHostsFile $path/$knownhostsfile
StrictHostKeyChecking no
Protocol 2
BatchMode yes
CheckHostIP no
Compression no
ConnectTimeout 20
ForwardX11 no
HostbasedAuthentication yes
NoHostAuthenticationForLocalhost no
# Newer OpenSSH options
#SetupTimeOut 20
EOFSSH
;
close SSHFILE ||  die "Could not close $conffile_ssh";


if (system "$sshd -t -q -f $conffile") {
    # This is likely due to missing support for UsePam
    print "$sshd is too old and is not supported\n";
    unlink $conffile;
    exit 1;
}

# Start the server
my $rc = system "$sshd -e -D -f $conffile > log/sshd.log 2>&1";
$rc >>= 8;
if($rc && $verbose) {
    print STDERR "$sshd exited with $rc!\n";
}

unlink $conffile;

exit $rc;