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# SMB Perl library, Copyright (C) 2014-2018 Mikhael Goikhman, migo@cpan.org |
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# |
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# This program is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see . |
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package SMB::v2::Command::Negotiate; |
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use strict; |
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use warnings; |
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use parent 'SMB::v2::Command'; |
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use SMB::Time; |
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sub new_from_v1 ($$) { |
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my $class = shift; |
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my $command1 = shift; |
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my $header1 = $command1->header; |
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my $flags = $header1->{flags} & SMB::v1::Header::FLAGS_RESPONSE ? SMB::v2::Header::FLAGS_RESPONSE : 0; |
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my $security_mode = |
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($header1->{flags2} & SMB::v1::Header::FLAGS2_SECURITY_SIGNATURE ? 1 : 0) | |
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($header1->{flags2} & SMB::v1::Header::FLAGS2_SECURITY_SIGNATURE_REQUIRED ? 2 : 0); |
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my $header = SMB::v2::Header->new( |
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code => 0, |
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mid => 0, |
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flags => $flags, |
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status => $command1->status, |
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); |
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my $self = $class->SUPER::new($header); |
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$self->set( |
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security_mode => $security_mode, |
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dialects => [ 0x0202, 0x02ff ], |
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); |
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return $self; |
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} |
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sub get_system_boot_time () { |
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chomp(my $boot_str = `uptime -s 2>/dev/null` || ''); |
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chomp(my $boot_time = `date +%s -d "$boot_str" 2>/dev/null`); |
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return $boot_time =~ /^(\d{9,10})$/ ? $1 : time; |
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} |
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sub init ($) { |
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$_[0]->set( |
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dialects => [ 0x0202, 0x0210, 0x02ff ], |
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dialect => 0x0210, |
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security_mode => 0, |
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capabilities => 0x7, |
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guid => "\5" x 16, |
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max_transact_size => 1 << 20, |
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max_read_size => 1 << 16, |
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max_write_size => 1 << 16, |
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current_time => 0, |
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boot_time => 0, |
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security_buffer => undef, |
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) |
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} |
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sub parse ($$%) { |
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my $self = shift; |
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my $parser = shift; |
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if ($self->is_response) { |
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$self->security_mode($parser->uint16); |
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$self->dialect($parser->uint16); |
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$parser->uint16; # reserved |
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$self->guid($parser->bytes(16)); |
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$self->capabilities($parser->uint32); |
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$self->max_transact_size($parser->uint32); |
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$self->max_read_size($parser->uint32); |
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$self->max_write_size($parser->uint32); |
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$self->current_time($parser->uint64); |
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$self->boot_time($parser->uint64); |
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my $offset = $parser->uint16; |
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my $length = $parser->uint16; |
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$parser->uint32; # reserved2 |
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$self->security_buffer($parser->bytes($length)); |
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} else { |
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my $num_dialects = $parser->uint16; |
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$self->security_mode($parser->uint16); |
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$parser->uint16; # reserved |
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$self->capabilities($parser->uint32); |
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$self->guid($parser->bytes(16)); |
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$self->boot_time($parser->uint64); |
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$self->dialects([ map { $parser->uint16 } 1 .. $num_dialects ]); |
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} |
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return $self; |
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} |
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sub pack ($$) { |
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my $self = shift; |
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my $packer = shift; |
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$self->boot_time(to_nttime(get_system_boot_time())); |
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if ($self->is_response) { |
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my $security_buffer = $self->security_buffer // die 'No security_buffer'; |
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$self->current_time(to_nttime(time())); |
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$packer |
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->uint16($self->security_mode) |
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->uint16($self->dialects->[1] || $self->dialect) |
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->uint16(0) # reserved |
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->bytes ($self->guid) |
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->uint32($self->capabilities) |
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->uint32($self->max_transact_size) |
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->uint32($self->max_read_size) |
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->uint32($self->max_write_size) |
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->uint64($self->current_time) |
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->uint64($self->boot_time) |
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->uint16($packer->diff('smb-header') + 8) |
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->uint16(length $security_buffer) |
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->uint32(0) # reserved2 |
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->bytes ($security_buffer) |
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; |
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} else { |
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my $dialects = $self->dialects; |
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$packer |
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->uint16(scalar @$dialects) |
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->uint16($self->security_mode) |
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->uint16(0) # reserved |
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->uint32($self->capabilities) |
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->bytes ($self->guid) |
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->uint64($self->boot_time) |
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; |
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$packer->uint16($_) for @$dialects; |
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} |
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} |
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sub supports_smb_dialect ($$) { |
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my $self = shift; |
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my $dialect0 = shift || die; |
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for my $dialect (@{$self->dialects}) { |
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return 1 if $dialect > $dialect0; |
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} |
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return 0; |
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} |
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1; |