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A trust is used to establish forest-forest or domain-domain (intra-domain) authentication, which allows users to access resources in (or perform administrative tasks) another domain, outside of the main domain where their account resides. A trust creates a link between the authentication systems of two domains and may allow either one-way or two-way (bidirectional) communication. An organization can create various types of trusts:
Parent-child: Two or more domains within the same forest. The child domain has a two-way transitive trust with the parent domain, meaning that users in the child domain corp.inlanefreight.local could authenticate into the parent domain inlanefreight.local, and vice-versa.Cross-link: A trust between child domains to speed up authentication.External: A non-transitive trust between two separate domains in separate forests which are not already joined by a forest trust. This type of trust utilizes SID filtering or filters out authentication requests (by SID) not from the trusted domain.Tree-root: A two-way transitive trust between a forest root domain and a new tree root domain. They are created by design when you set up a new tree root domain within a forest.Forest: A transitive trust between two forest root domains.
⚒️Using Get-ADTrust
PS C:\htb> Import-Module activedirectory
PS C:\htb> Get-ADTrust -Filter *
Direction : BiDirectional
DisallowTransivity : False
DistinguishedName : CN=LOGISTICS.INLANEFREIGHT.LOCAL,CN=System,DC=INLANEFREIGHT,DC=LOCAL
ForestTransitive : False
IntraForest : True
IsTreeParent : False
IsTreeRoot : False
Name : LOGISTICS.INLANEFREIGHT.LOCAL
ObjectClass : trustedDomain
ObjectGUID : f48a1169-2e58-42c1-ba32-a6ccb10057ec
SelectiveAuthentication : False
SIDFilteringForestAware : False
SIDFilteringQuarantined : False
Source : DC=INLANEFREIGHT,DC=LOCAL
Target : LOGISTICS.INLANEFREIGHT.LOCAL
TGTDelegation : False
TrustAttributes : 32
TrustedPolicy :
TrustingPolicy :
TrustType : Uplevel
UplevelOnly : False
UsesAESKeys : False
UsesRC4Encryption : False
Direction : BiDirectional
DisallowTransivity : False
DistinguishedName : CN=FREIGHTLOGISTICS.LOCAL,CN=System,DC=INLANEFREIGHT,DC=LOCAL
ForestTransitive : True
IntraForest : False
IsTreeParent : False
IsTreeRoot : False
Name : FREIGHTLOGISTICS.LOCAL
ObjectClass : trustedDomain
ObjectGUID : 1597717f-89b7-49b8-9cd9-0801d52475ca
SelectiveAuthentication : False
SIDFilteringForestAware : False
SIDFilteringQuarantined : False
Source : DC=INLANEFREIGHT,DC=LOCAL
Target : FREIGHTLOGISTICS.LOCAL
TGTDelegation : False
TrustAttributes : 8
TrustedPolicy :
TrustingPolicy :
TrustType : Uplevel
UplevelOnly : False
UsesAESKeys : False
UsesRC4Encryption : False
Aside from using built-in AD tools such as the Active Directory PowerShell module, both PowerView and BloodHound can be utilized to enumerate trust relationships
⚒️Checking for Existing Trusts using Get-DomainTrust
PS C:\htb> Get-DomainTrust
SourceName : INLANEFREIGHT.LOCAL
TargetName : LOGISTICS.INLANEFREIGHT.LOCAL
TrustType : WINDOWS_ACTIVE_DIRECTORY
TrustAttributes : WITHIN_FOREST
TrustDirection : Bidirectional
WhenCreated : 11/1/2021 6:20:22 PM
WhenChanged : 2/26/2022 11:55:55 PM
SourceName : INLANEFREIGHT.LOCAL
TargetName : FREIGHTLOGISTICS.LOCAL
TrustType : WINDOWS_ACTIVE_DIRECTORY
TrustAttributes : FOREST_TRANSITIVE
TrustDirection : Bidirectional
WhenCreated : 11/1/2021 8:07:09 PM
WhenChanged : 2/27/2022 12:02:39 AM