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[GUIA] Correção de assinatura BIOS Insyde H2O

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[GUIA] Correção de assinatura BIOS Insyde H2O

 

Recentemente comprei um notebook Lenovo L440 pra instalar o macOS Mojave e fui substituir a placa wireless pela DW1560 porque a atual não é compatível. Descobri que existia uma whitelist de placas permitidas que as fabricantes estão adotando recentemente (no meu caso utiliza uma bios Phoenix Insyde BIOS H2O).

 

Procurei em fórums de BIOS MODDING e encontrei pessoas que fizeram o patch pra mim. Só que após substituir a BIOS notei que o computador ficava apitando 5 vezes todas vez que ligava e fui me aprofundar no caso. E foi aí que descobri como resolver isso e por isso criei esse guia baseado nas informações que achei em alguns fóruns russos.

 

 

Prefácio

 

Quando a BIOS falha no teste te integridade, algumas funcionalidades Intel AMT param de funcionar e é emitido uma sequência de 5 apitos duas vezes no boot.

Após modificar para remover whitelist (habilitar placas WI-FI não autorizadas), destravar MSR 0xe2 (hackintosh), habilitar menu avançado, etc. a BIOS não vai passar no teste de integridade causando esse problema.

Essa verificação de integridade é feita através da assinatura RSA do bloco da BIOS chamado TCPABIOS (mais informações abaixo) com a chave pública no formato modulus 3 também armazenada na BIOS.

Esse bloco TCPABIOS armazena os checksums de cada volume da BIOS.

 

O que faremos é gerar novos checkums para esses volumes que foram modificados, gerar um para de chaves RSA (privada e pública), assinar esse bloco com a chave privada e substituir a chave pública.

 

 

Ferramentas necessárias

 

- EFITool NE alpha 54: https://github.com/LongSoft/UEFITool/releases

- HxD 2.1.0: https://mh-nexus.de/en/hxd/

- OpenSSL: http://gnuwin32.sourceforge.net/packages/openssl.htm (Download -> Binaries)

- Microsoft File Checksum Integrity Verifier (FCIV.exe): https://www.microsoft.com/en-us/download/details.aspx?id=11533

 

Passo a passo

 

Vamos abrir a BIOS modificada, localizar o bloco TCPABIOS e entender sua anatomia.

 

1. Abra a BIOS no HxD

 

image.png.9bd20639628631149f820fde57e42233.png

(Vamos utilizar nesse guia a BIOS modificada no fórum MyDigitalLife.com pelo usuário Serg008 para o notebook Lenovo B590)

 

2. Busque a palavra TCPABIOS:

 

image.png.931aa98e383f2b3b9273b3956d6a0236.png

image.png.8cef4f91211ce1eafafcb7af51297583.png

 

3. O bloco começa com TCPABIOS e termina com antes de TCPACPUH

 

image.png.51262f4653917f3ed1ab1ee74d45006e.png

 

4. Anatomia:

 

54 43 50 41 42 49 4F 53 48 31 38 34 61 31 31 2F

32 36 2F 31 33 49 42 4D 53 45 43 55 52 00 FD 27

34 2A 35 AB 41 26 39 E3 32 E5 B6 8A D6 49 5B 0B

77 F9 82 58 48 00 00 00 CE 18 1F 00 00 00 03 00

00 00 00 00 00 00 27 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 FF FF 83 04 D4

52 52 95 C5 D7 21 55 78 0E 5C AD 47 EE C4 3D 1D

C1 EC 69 03 2B 51 A5 42 61 96 22 F9 7B 88 57 B7

A8 9D D0 20 DB 5B 11 10 55 07 84 6C 62 DF FA 2F

6A A8 43 0C 8A 40 AF 79 0D 31 DB 5A 5D C8 2F EB

F8 7C 87 B0 A6 3D 2A 88 AE 91 9D 88 E3 AA 85 E3

5A B3 91 7F 28 68 1F BA 92 C4 7E 10 F5 1A 7E 75

A9 6F CE C0 4F BA FA 79 A5 98 2B 50 60 BA 09 73

7B 03 D1 0C 3E A2 9C 44 DF E9 F2 92 34 7B

 

Cinza: Nome e informações do bloco

Vermelho: Informações dos volumes (Checksum e Cabeçalho)

Azul: Separação da lista de volumes para a assinatura do bloco

Verde: Assinatura do bloco TCPABIOS são os últimos 128 bytes

 

Lista de Volumes:

 

Cada volume tem o formato: 00 FD 27 34 2A 35 AB 41 26 39 E3 32 E5 B6 8A D6 49 5B 0B 77 F9 82 58 48 00 00 00 CE 18 1F 00 00 00 03 00 00 00 00 00

                                                (prefixo 3 bytes + checksum 20 bytes + offset 4 bytes + tamanho do volume 6 bytes + separador do fim 6 bytes)

 

Os volumes são enumerados e utilizam o primeiro byte no prefixo para isso (00 FD 27), começando do 0.

A BIOS utilizada nesse exemplo possui somente um volume, mas no caso de mais de um volume, seria: 00 FD 27 .., 01 FD 27 ..., 02 FD 27 ...

- Checksum é o cálculo SHA1 do volume.

- Offset é a posição do volume dentro da BIOS. Os bytes ficam invertidos, nesse caso seria 00 00 00 48 ou seja: 48h

- Tamanho do volume também está com os bytes invertidos, então: 1F18CEh

 

Então é isso. Precisamos corrigir essas informações (checksum, offset e tamanho)

 

5. Para extrair os volumes abra a BIOS com o UEFITool e veja como identificar os volumes (nosso exemplo há somente um volume, se houvessem outros estariam também dentro de EfiFirmwareFileSystemGuid):

 

image.thumb.png.ccbcc129e633036cbcbcec60deae5771.png

 

Na BIOS original, circulado em vermelho podemos ver o nosso volume.

Observe que em azul temos Offset e verde o tamanho. Exatamente como verificamos acima no HxD. Já na BIOS modificada vemos que está diferente o tamanho:

Oridinal: 1F18CEh

Modificada: 1F12D5h (vamos precisar disso mais tarde)

 

6. Vamos extrair esse volume escolhendo a opção “Extract as is...”

 

image.png.4f6c6b44f33f610326329f01a22db1a8.pngimage.png.69537d20c3a7e5adc3194e404d65ce3c.png 

 

7. Utilize esse comando para obter o checkum desse volume: fciv.exe -sha1 File_Volume_image_FvMainCompact.ffs

 

image.png.cbc530b6859dad3b6b46d1bfbbc9e6d8.png

 

Agora temos o checksum que é 396e0dc987219b4369b1b9e010166302ce635202

 

8. Substitua as informações no bloco TCPABIOS:

 

image.png.fce7e2fe4f5b9861cfcfe8b0aece8459.png

 

Observe que o tamanho do volume precisa ter os bytes invertidos, então se o total são 6 bytes e é 1F12D5h, fica D5 12 1F 00 00 00 no lugar de CE 18 1F 00 00 00.

Se o offset for diferente, também realizar o mesmo procedimento invertendo os bytes.

Checksum alterar de 34 2A 35 AB 41 26 39 E3 32 E5 B6 8A D6 49 5B 0B 77 F9 82 58 para 39 6E 0D C9 87 21 9B 43 69 B1 B9 E0 10 16 63 02 CE 63 52 02

 

Faça esse procedimento para cada volume na BIOS.

 

9. Agora precisamos gerar o checksum de todo o bloco TCPABIOS mas sem considerar os últimos 131 bytes, ou seja desconsiderar de FF FF 83 + 80 bytes da assinatura anterior.

 

Copie para um novo arquivo no HxD e salve como tcpabios

 

image.png.fe2cb4ed07464785c8469c30b32541bf.png

 

Utilize o comando para gerar o checksum desse bloco: fciv.exe -sha1 tcpabios

 

image.png.5325dcc1c6b630c0ff1423adc4c723d4.png

 

Checksum do bloco TCPABIOS: 0da6715509839a376b0a52e81fdf9683a8e70e52

 

Crie um novo arquivo no HxD e adicione 108 bytes com 00 e cole o checksum no final e salve como tcpabios_sha, ficando assim:

 

image.png.3abfadf19cea0a41a461661fa7cb3fc7.png

 

10. Agora vamos gerar a chave privada RSA com modulus 3: openssl genrsa -3 -out my_key.pem 1024

 

image.png.1aa571bb1c48113d1630cfb1e676bbe5.png

 

Assinar o arquivo tcpabios_sha: openssl rsautl -inkey my_key.pem -sign -in tcpabios_hash -raw > tcpabios_sign

 

image.png.f6aa958f87b2a012aaa679c32cc44c12.png

 

Agora aproveite para gerar a chave publica: openssl rsa -in my_key.pem -outform der -pubout -out my_key_pub.der

 

image.png.0b46c643e8aa32dc899f20e080c7b982.png

 

E gerar modulus 3 da chave pública: openssl rsa -pubin -inform der -in my_key_pub.der -text -noout

 

image.png.de85889394db5266570e9f4e84420dc8.png

 

Copie e cole a chave em um arquivo de texto para utilizar daqui a pouco. Remova todos os “:” e coloque tudo em uma única linha, ficando assim:

 

image.png.e319dc1c7338214857a669eb52f44036.png

 

11.   Abra o arquivo tcpabios_sign no HxD, copie o conteúdo e substitua a assinatura no final do bloco TCPABIOS:

 

 image.png.b4d270f8674000ee94ea2d538f0d8ac0.pngimage.png.3e3bf21863474216a6464d9918f86013.png

 

12. Agora vamos localizar na BIOS o local da chave pública e substituir. Essa chave começa com 12 04 e termina com 01 03 FF e fica após o bloco TCPABBLK.

 

A chave fica assim: 12 04 + 81 bytes + 01 03 FF. Faça uma busca por 01 03 FF para localizar mais facilmente. Verifique se antes dos 81 bytes tem os bytes 12 04 para ter certeza que achou.

 

image.png.7c068048eb8c61f246a1a4a6ab5249a3.png

 

image.png.f5e676b7c1ddf88d85cd3f3428f3e60a.png

 

Agora substitua pela chave pública que ficou anotado no arquivo de texto anteriormente, ficando assim:

 

image.png.0c27ad6e4301b03208ca8cd57f77e44b.png

 

 

Salve e está pronto. Sua BIOS está assinada e pronta.

 

Edited by ludufre

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      I would appreciate comments and suggestions!!
       
      Status:
      Speakers : OK Headphones : OK HDMI Audio : OK (Intel HD4K Tested) LineIn : N/A (Model Without LineIn) MicInt : OK MicIntNoiseReduction : OK MicExt : N/A (Model Without MicExt) AutoDetectLineIn : N/A (Model Without LineIn) Sleep : OK WakeUp : OK AutoSleep : OK Hibernate : OK Siri : OK   Tested Laptops:
       
      - HP Pavillion 15-D002SS
       
      Coming Soon:
       
      - Unified installer for the different supported operating systems.
      - Support model with LineIn jack.
       
      Modified Verbs:
      01271C20 01271D00 01271EA0 01271F90 01471C10 01471D00 01471E17 01471F90 01871CF0 01871D00 01871E00 01871F40 01E71CF0 01E71D00 01E71E00 01E71F40 02171C30 02171D10 02171E21 02171F00 01470C02   DSDT:
       
      Patch to apply with MaciASL in your DSDT
      ######################################### HDEF v1.00######################################## into method label _DSM parent_label HDEF remove_entry;into device label HDEF insertbeginMethod (_DSM, 4, NotSerialized)\n{\n If (LEqual (Arg2, Zero)) { Return (Buffer() { 0x03 } ) }\n Return (Package()\n {\n "layout-id", Buffer() { 0x01, 0x00, 0x00, 0x00 },\n //"layout-id", Buffer() { 0x03, 0x00, 0x00, 0x00 },\n "hda-gfx", Buffer() { "onboard-1" },\n "PinConfigurations", Buffer() { },\n })\n}\nend;  
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