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require 'rspec'
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RSpec.describe 'kerberos keytab' do
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  include_context 'Msf::UIDriver'
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  include_context 'Msf::DBManager'
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  include_context 'Msf::Simple::Framework#modules loading'
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  let(:subject) do
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    load_and_create_module(
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      module_type: 'auxiliary',
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      reference_name: 'admin/kerberos/keytab'
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    )
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  end
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=begin
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  Generated with heimdal ktutil; which has two additional bytes at the end for a 32-bit kvno and flags which are
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  not present in the mit format
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  rm -f heimdal.keytab
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  ktutil --keytab=./heimdal.keytab --verbose add --password=password [email protected] --enctype=aes256-cts-hmac-sha1-96 --kvno=1
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  ktutil --keytab=./heimdal.keytab --verbose add --password=password [email protected] --enctype=aes128-cts-hmac-sha1-96 --kvno=1
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  ktutil --keytab=./heimdal.keytab --verbose add --password=password [email protected] --enctype=arcfour-hmac-md5 --kvno=1
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  ktutil --keytab=./heimdal.keytab --verbose list
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  ruby -r 'active_support/core_ext/array' -e 'puts File.binread("./heimdal.keytab").bytes.map { |x| "\\x#{x.to_s(16).rjust(2, "0")}" }.in_groups_of(16).map { |row| "\"#{row.join("")}\"" }.join(" \\ \n")'
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=end
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  let(:valid_keytab) do
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    "\x05\x02\x00\x00\x00\x54\x00\x01\x00\x0c\x44\x4f\x4d\x41\x49\x4e" \
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    "\x2e\x4c\x4f\x43\x41\x4c\x00\x0d\x41\x64\x6d\x69\x6e\x69\x73\x74" \
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    "\x72\x61\x74\x6f\x72\x00\x00\x00\x01\x63\x38\x7e\x21\x01\x00\x12" \
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    "\x00\x20\xc4\xa3\xf3\x1d\x64\xaf\xa6\x48\xa6\xd0\x8d\x07\x76\x56" \
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    "\x3e\x12\x38\xb9\x76\xd0\xb9\x0f\x79\xea\x07\x21\x94\x36\x82\x94" \
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    "\xe9\x29\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x44\x00\x01" \
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    "\x00\x0c\x44\x4f\x4d\x41\x49\x4e\x2e\x4c\x4f\x43\x41\x4c\x00\x0d" \
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    "\x41\x64\x6d\x69\x6e\x69\x73\x74\x72\x61\x74\x6f\x72\x00\x00\x00" \
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    "\x01\x63\x38\x7e\x21\x01\x00\x11\x00\x10\xba\xba\x43\xa8\xb9\x7b" \
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    "\xac\xa1\x53\xbd\x54\xb2\xf0\x77\x4a\xd7\x00\x00\x00\x01\x00\x00" \
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    "\x00\x00\x00\x00\x00\x44\x00\x01\x00\x0c\x44\x4f\x4d\x41\x49\x4e" \
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    "\x2e\x4c\x4f\x43\x41\x4c\x00\x0d\x41\x64\x6d\x69\x6e\x69\x73\x74" \
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    "\x72\x61\x74\x6f\x72\x00\x00\x00\x01\x63\x38\x7e\x21\x01\x00\x17" \
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    "\x00\x10\x88\x46\xf7\xea\xee\x8f\xb1\x17\xad\x06\xbd\xd8\x30\xb7" \
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    "\x58\x6c\x00\x00\x00\x01\x00\x00\x00\x00"
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  end
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  let(:keytab_file) { Tempfile.new('keytab') }
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  before(:each) do
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    Timecop.freeze(Time.parse('Jul 15, 2022 12:33:40.000000000 GMT'))
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    subject.datastore['VERBOSE'] = false
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    allow(driver).to receive(:input).and_return(driver_input)
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    allow(driver).to receive(:output).and_return(driver_output)
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    subject.init_ui(driver_input, driver_output)
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  end
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  after(:each) do
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    Timecop.return
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  end
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  describe '#add_keytab_entry' do
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    context 'when the keytab file does not exist' do
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      before(:each) do
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        File.delete(keytab_file.path)
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        subject.datastore['KEYTAB_FILE'] = keytab_file.path
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      end
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      context 'when supplying a key with aes126 encryption type' do
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        it 'creates a new keytab' do
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          subject.datastore['PRINCIPAL'] = 'Administrator'
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          subject.datastore['REALM'] = 'DOMAIN.LOCAL'
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          subject.datastore['KVNO'] = 1
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          subject.datastore['ENCTYPE'] = 'AES256'
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          subject.datastore['KEY'] = 'c4a3f31d64afa648a6d08d0776563e1238b976d0b90f79ea072194368294e929'
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          subject.add_keytab_entry
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          subject.list_keytab_entries
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          expect(@combined_output.join("\n")).to match_table <<~TABLE
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          keytab saved to #{keytab_file.path}
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          Keytab entries
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          ==============
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           kvno  type         principal                   hash                                                              date
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           ----  ----         ---------                   ----                                                              ----
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           1     18 (AES256)  [email protected]  c4a3f31d64afa648a6d08d0776563e1238b976d0b90f79ea072194368294e929  #{Time.parse('1970-01-01 00:00:00 +0000').to_time}
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          TABLE
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        end
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      end
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      context 'when supplying a password with the ALL encryption type specified' do
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        it 'creates a new keytab' do
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          subject.datastore['PRINCIPAL'] = 'Administrator'
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          subject.datastore['REALM'] = 'DOMAIN.LOCAL'
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          subject.datastore['KVNO'] = 1
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          subject.datastore['ENCTYPE'] = 'ALL'
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          subject.datastore['PASSWORD'] = 'password'
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          subject.add_keytab_entry
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          subject.list_keytab_entries
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          expect(@combined_output.join("\n")).to match_table <<~TABLE
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          keytab saved to #{keytab_file.path}
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          Keytab entries
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          ==============
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           kvno  type                principal                   hash                                                              date
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           ----  ----                ---------                   ----                                                              ----
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           1     3  (DES_CBC_MD5)    [email protected]  89d3b923d6a7195e                                                  #{Time.parse('1970-01-01 00:00:00 +0000').to_time}
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           1     16 (DES3_CBC_SHA1)  [email protected]  341994e0ba5b1a20d640911cda23c137b637d51a6416d6cb                  #{Time.parse('1970-01-01 00:00:00 +0000').to_time}
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           1     23 (RC4_HMAC)       [email protected]  8846f7eaee8fb117ad06bdd830b7586c                                  #{Time.parse('1970-01-01 00:00:00 +0000').to_time}
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           1     17 (AES128)         [email protected]  baba43a8b97baca153bd54b2f0774ad7                                  #{Time.parse('1970-01-01 00:00:00 +0000').to_time}
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           1     18 (AES256)         [email protected]  c4a3f31d64afa648a6d08d0776563e1238b976d0b90f79ea072194368294e929  #{Time.parse('1970-01-01 00:00:00 +0000').to_time}
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          TABLE
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        end
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      end
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      context 'when supplying a password with aes256 encryption type' do
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        it 'creates a new keytab' do
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          subject.datastore['PRINCIPAL'] = 'Administrator'
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          subject.datastore['REALM'] = 'DOMAIN.LOCAL'
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          subject.datastore['KVNO'] = 1
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          subject.datastore['ENCTYPE'] = 'AES256'
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          subject.datastore['PASSWORD'] = 'password'
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          subject.add_keytab_entry
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          subject.list_keytab_entries
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          expect(@combined_output.join("\n")).to match_table <<~TABLE
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          keytab saved to #{keytab_file.path}
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          Keytab entries
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          ==============
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           kvno  type         principal                   hash                                                              date
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           ----  ----         ---------                   ----                                                              ----
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           1     18 (AES256)  [email protected]  c4a3f31d64afa648a6d08d0776563e1238b976d0b90f79ea072194368294e929  #{Time.parse('1970-01-01 00:00:00 +0000').to_time}
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          TABLE
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        end
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      end
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    end
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    context 'when the keytab file exists' do
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      before(:each) do
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        File.binwrite(keytab_file.path, valid_keytab)
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        subject.datastore['KEYTAB_FILE'] = keytab_file.path
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      end
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      context 'when supplying a password with aes256 encryption type' do
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        it 'updates the existing keytab' do
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          subject.datastore['PRINCIPAL'] = 'Administrator'
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          subject.datastore['REALM'] = 'DOMAIN.LOCAL'
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          subject.datastore['KVNO'] = 1
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          subject.datastore['ENCTYPE'] = 'AES256'
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          subject.datastore['PASSWORD'] = 'password'
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          subject.add_keytab_entry
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          subject.list_keytab_entries
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          expect(@combined_output.join("\n")).to match_table <<~TABLE
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            keytab saved to #{keytab_file.path}
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            Keytab entries
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            ==============
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             kvno  type           principal                   hash                                                              date
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             ----  ----           ---------                   ----                                                              ----
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             1     18 (AES256)    [email protected]  c4a3f31d64afa648a6d08d0776563e1238b976d0b90f79ea072194368294e929  #{Time.parse('2022-10-01 17:51:29 +0000').to_time}
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             1     17 (AES128)    [email protected]  baba43a8b97baca153bd54b2f0774ad7                                  #{Time.parse('2022-10-01 17:51:29 +0000').to_time}
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             1     23 (RC4_HMAC)  [email protected]  8846f7eaee8fb117ad06bdd830b7586c                                  #{Time.parse('2022-10-01 17:51:29 +0000').to_time}
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             1     18 (AES256)    [email protected]  c4a3f31d64afa648a6d08d0776563e1238b976d0b90f79ea072194368294e929  #{Time.parse('1970-01-01 00:00:00 +0000').to_time}
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          TABLE
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        end
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      end
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    end
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  end
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  describe '#list_keytab_entries' do
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    context 'when the keytab file does not exist' do
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      it 'raises a config error' do
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        expect { subject.list_keytab_entries }.to raise_error Msf::Auxiliary::Failed, /Invalid key tab file/
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      end
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    end
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    context 'when the keytab file exists' do
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      before(:each) do
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        File.binwrite(keytab_file.path, valid_keytab)
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        subject.datastore['KEYTAB_FILE'] = keytab_file.path
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      end
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      it 'lists the available keytab entries' do
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        subject.list_keytab_entries
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        expect(@combined_output.join("\n")).to match_table <<~TABLE
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          Keytab entries
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          ==============
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           kvno  type           principal                   hash                                                              date
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           ----  ----           ---------                   ----                                                              ----
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           1     18 (AES256)    [email protected]  c4a3f31d64afa648a6d08d0776563e1238b976d0b90f79ea072194368294e929  #{Time.parse('2022-10-01 17:51:29 +0000').to_time}
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           1     17 (AES128)    [email protected]  baba43a8b97baca153bd54b2f0774ad7                                  #{Time.parse('2022-10-01 17:51:29 +0000').to_time}
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           1     23 (RC4_HMAC)  [email protected]  8846f7eaee8fb117ad06bdd830b7586c                                  #{Time.parse('2022-10-01 17:51:29 +0000').to_time}
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        TABLE
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      end
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    end
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  end
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  describe '#export_keytab_entries' do
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    context 'when the keytab file does not exist' do
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      before(:each) do
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        File.delete(keytab_file.path)
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        subject.datastore['KEYTAB_FILE'] = keytab_file.path
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        framework.db.delete_credentials(ids: (framework.db.creds || []).map(&:id))
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      end
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      after(:each) do
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        framework.db.delete_credentials(ids: (framework.db.creds || []).map(&:id))
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      end
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      context 'when there is no database active' do
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        before(:each) do
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          allow(subject.framework.db).to receive(:active).and_return(false)
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        end
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        it 'notifies the user that there is no database active' do
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          subject.export_keytab_entries
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          expect(@combined_output.join("\n")).to match_table <<~TABLE
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            export not available, because the database is not active.
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          TABLE
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        end
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      end
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      context 'when there are no kerberos or ntlm creds present in the database' do
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        it 'notifies the user that there are no entries to export' do
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          subject.export_keytab_entries
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          expect(@combined_output.join("\n")).to match_table <<~TABLE
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            No entries to export
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            keytab saved to #{keytab_file.path} 
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          TABLE
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        end
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      end
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      context 'when there are kerberos and ntlm creds present in the database' do
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        def report_creds(
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          user, hash, type: :ntlm_hash, jtr_format: '', realm_key: nil, realm_value: nil,
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          rhost: '192.0.2.2', rport: '445', myworkspace_id: nil, module_fullname: nil
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        )
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          service_data = {
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            address: rhost,
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            port: rport,
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            service_name: 'smb',
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            protocol: 'tcp',
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            workspace_id: myworkspace_id
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          }
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          credential_data = {
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            module_fullname: module_fullname,
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            origin_type: :service,
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            private_data: hash,
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            private_type: type,
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            jtr_format: jtr_format,
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            username: user
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          }.merge(service_data)
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          credential_data[:realm_key] = realm_key if realm_key
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          credential_data[:realm_value] = realm_value if realm_value
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          cl = framework.db.create_credential_and_login(credential_data)
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          cl.respond_to?(:core_id) ? cl.core_id : nil
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        end
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        before(:each) do
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          report_creds(
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            'user_without_realm', 'aad3b435b51404eeaad3b435b51404ee:e02bc503339d51f71d913c245d35b50b',
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            type: :ntlm_hash, module_fullname: subject.fullname, myworkspace_id: framework.db.default_workspace.id
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          )
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          report_creds(
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            'user_with_realm', 'aad3b435b51404eeaad3b435b51404ee:32ede47af254546a82b1743953cc4950',
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            type: :ntlm_hash, module_fullname: subject.fullname, myworkspace_id: framework.db.default_workspace.id,
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            realm_key: Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN, realm_value: 'example.local'
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          )
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          krb_key = {
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            enctype: Rex::Proto::Kerberos::Crypto::Encryption::AES256,
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            salt: "DEMO.LOCALuser_with_krbkey".b,
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            key: 'c4a3f31d64afa648a6d08d0776563e1238b976d0b90f79ea072194368294e929'
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          }
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          report_creds(
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            'user_with_krbkey', Metasploit::Credential::KrbEncKey.build_data(**krb_key),
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            type: :krb_enc_key, module_fullname: subject.fullname, myworkspace_id: framework.db.default_workspace.id,
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            realm_key: Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN, realm_value: 'demo.local'
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          )
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        end
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        it 'exports the creds' do
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          subject.export_keytab_entries
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          subject.list_keytab_entries
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          expect(@combined_output.join("\n")).to match_table <<~TABLE
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            keytab saved to #{keytab_file.path}
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            Keytab entries
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            ==============
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             kvno  type           principal                      hash                                                                                                                              date
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             ----  ----           ---------                      ----                                                                                                                              ----
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             1     23 (RC4_HMAC)  user_without_realm@            e02bc503339d51f71d913c245d35b50b                                                                                                  #{Time.parse('1970-01-01 01:00:00 +0100').to_time}
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             1     23 (RC4_HMAC)  [email protected]  32ede47af254546a82b1743953cc4950                                                                                                  #{Time.parse('1970-01-01 01:00:00 +0100').to_time}
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             1     18 (AES256)    [email protected]    63346133663331643634616661363438613664303864303737363536336531323338623937366430623930663739656130373231393433363832393465393239  #{Time.parse('1970-01-01 01:00:00 +0100').to_time}
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          TABLE
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        end
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      end
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    end
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  end
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end
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