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cifs: negotiates the highest SMB2+ version supported by default

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instead of hardcoding it to a potential outdated value.

For `smbclient` we only set max-protocol version and that could only
be smb2 or smb3 (no finer granularity) any how, so this was not
really correct.

Nowadays the kernel dropped SMB1 and tries to go for SMB2.1 or higher
by default, depending on what client and server supports. SMB2.1 is
Windows 7/2008R2 - both EOL since quite a bit, so ok as default lower
boundary.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Thomas Lamprecht 2021-09-14 16:23:23 +02:00
parent 9fff8c7aca
commit e1667a2253
1 changed files with 9 additions and 4 deletions
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13
PVE/Storage/CIFSPlugin.pm
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@ -78,7 +78,7 @@ sub cifs_mount {
push @$cmd, 'guest,username=guest';
}
push @$cmd, '-o', defined($smbver) ? "vers=$smbver" : "vers=3.0";
push @$cmd, '-o', defined($smbver) ? "vers=$smbver" : "vers=default";
run_command($cmd, errmsg => "mount error");
}
@ -115,8 +115,10 @@ sub properties {
maxLength => 256,
},
smbversion => {
description => "SMB protocol version",
description => "SMB protocol version. 'default' if not set, negotiates the highest SMB2+"
." version supported by both the client and server.",
type => 'string',
default => 'default',
enum => ['default', '2.0', '2.1', '3', '3.0', '3.11'],
optional => 1,
},
@ -255,9 +257,12 @@ sub check_connection {
my $servicename = '//'.$scfg->{server}.'/'.$scfg->{share};
my $cmd = ['/usr/bin/smbclient', $servicename, '-d', '0', '-m'];
my $cmd = ['/usr/bin/smbclient', $servicename, '-d', '0'];
push @$cmd, $scfg->{smbversion} ? "smb".int($scfg->{smbversion}) : 'smb3';
if (defined($scfg->{smbversion}) && $scfg->{smbversion} ne 'default') {
# max-protocol version, so basically only relevant for smb2 vs smb3
push @$cmd, '-m', "smb" . int($scfg->{smbversion});
}
if (my $cred_file = get_cred_file($storeid)) {
push @$cmd, '-U', $scfg->{username}, '-A', $cred_file;