Hello,
I would like to use IPA server in heterogeneous environment with Linux servers and Windows workstations. IPA domain would be used as a primary source of users and groups. AD domain would be used for management of Widows hosts only (group policies etc.).
I have setup a test network with two-trust between AD and IPA domain and realized, that IPA domain sees AD users but AD domain doesn't see IPA users. Am I missing something or the two-way trust is not two-way in fact?
SW used: CentOS 7.5 - IPA server and IPA domain member Windows Server 2016 Standard - AD server Windows 10 Pro - AD domain member
Best regards
Michal
On to, 23 elo 2018, Michal Sladek via FreeIPA-users wrote:
Hello,
I would like to use IPA server in heterogeneous environment with Linux servers and Windows workstations. IPA domain would be used as a primary source of users and groups. AD domain would be used for management of Widows hosts only (group policies etc.).
I have setup a test network with two-trust between AD and IPA domain and realized, that IPA domain sees AD users but AD domain doesn't see IPA users. Am I missing something or the two-way trust is not two-way in fact?
It is two-way in principle. However, FreeIPA does not implement features required by AD DC to resolve IPA users on Windows workstations. It is on our long term roadmap.
Thanks a lot for your information! You saved me a lot of time...
Best regards
Michal
Hi all,
Refering to this bit of older post,
What now the difference between a One-way or Two-Way Trust anyway....? The docs are not too clear abut it:
" Two-way trust enables AD users and groups to access resources in IdM. However, the two-way trust in IdM does not give the users any additional rights compared to the one-way trust solution in AD. Both solutions are considered equally secure because of default cross-forest trust SID filtering settings"
What a use-case for using a Two-Way Trust? (since Windows cannot use IPA as a AD replacement)
Winfried -----Oorspronkelijk bericht----- Van: Alexander Bokovoy via FreeIPA-users freeipa-users@lists.fedorahosted.org Antwoord-naar: FreeIPA users list freeipa-users@lists.fedorahosted.org Aan: FreeIPA users list freeipa-users@lists.fedorahosted.org Cc: Michal Sladek michal@sladkovi.eu, Alexander Bokovoy abokovoy@redhat.com Onderwerp: [Freeipa-users] Re: Is IPA-AD two-way trust really two-way? Datum: Thu, 23 Aug 2018 12:08:17 +0300
On to, 23 elo 2018, Michal Sladek via FreeIPA-users wrote: Hello, I would like to use IPA server in heterogeneous environment with Linux servers and Windows workstations.IPA domain would be used as a primary source of users and groups.AD domain would be used for management of Widows hosts only (group policies etc.). I have setup a test network with two-trust between AD and IPA domainand realized, that IPA domain sees AD users but AD domain doesn't seeIPA users. Am I missing something or the two-way trust is not two-wayin fact?It is two-way in principle. However, FreeIPA does not implement featuresrequired by AD DC to resolve IPA users on Windows workstations. It is onour long term roadmap. -- / Alexander BokovoySr. Principal Software EngineerSecurity / Identity Management EngineeringRed Hat Limited, Finland_______________________________________________FreeIPA-users mailing list -- freeipa-users@lists.fedorahosted.orgTo unsubscribe send an email to freeipa-users-leave@lists.fedorahosted.orgFedora Code of Conduct: https://getfedora.org/code-of-conduct.htmlList Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelinesList Archives: https://lists.fedoraproject.org/archives/list/freeipa-users@lists.fedorahost...
On pe, 26 loka 2018, Winfried de Heiden wrote:
Hi all,
Refering to this bit of older post,
What now the difference between a One-way or Two-Way Trust anyway....? The docs are not too clear abut it:
" Two-way trust enables AD users and groups to access resources in IdM. However, the two-way trust in IdM does not give the users any additional rights compared to the one-way trust solution in AD. Both solutions are considered equally secure because of default cross-forest trust SID filtering settings"
What a use-case for using a Two-Way Trust? (since Windows cannot use IPA as a AD replacement)
Originally we implemented two-way trust first because it was easier to do than one-way trust from technical perspective. It allowed machines from IPA domain to directly query AD DCs about needed information using their own host/... Kerberos principals for authentication purposes.
However, a lot of customers were concerned with with AD trusting IPA because it wasn't how AD domain controllers resolved identities (and ran authentication proxying) over trust. We implemented one-way trust with a proper setup and actually moved to always use the credentials one-way-like in two-way trust too with FreeIPA 4.6/latest SSSD 1.15/1.16.
However, there is one missing part for a one-way trust: a one-way trust with a shared secret. If you are using a shared secret that is provided to you by AD admins (as opposed to be generated by 'ipa trust-add' automatically), one-way trust cannot be established. A long story short, both FreeIPA and SSSD lacked required logic to allow Windows to perform validation of the trust in this case from a Windows UI and we couldn't initiate the validation from IPA side as we didn't have administrative credentials to AD DCs.
So right now two-way trust with a shared secret is your solution for this case, although I'd rather suggest to establish a normal one-way trust with AD admin credentials to get a stronger trust secret generated for you by 'ipa trust-add'.
Winfried -----Oorspronkelijk bericht----- Van: Alexander Bokovoy via FreeIPA-users freeipa-users@lists.fedorahosted.org Antwoord-naar: FreeIPA users list freeipa-users@lists.fedorahosted.org Aan: FreeIPA users list freeipa-users@lists.fedorahosted.org Cc: Michal Sladek michal@sladkovi.eu, Alexander Bokovoy abokovoy@redhat.com Onderwerp: [Freeipa-users] Re: Is IPA-AD two-way trust really two-way? Datum: Thu, 23 Aug 2018 12:08:17 +0300
On to, 23 elo 2018, Michal Sladek via FreeIPA-users wrote: Hello, I would like to use IPA server in heterogeneous environment with Linux servers and Windows workstations.IPA domain would be used as a primary source of users and groups.AD domain would be used for management of Widows hosts only (group policies etc.). I have setup a test network with two-trust between AD and IPA domainand realized, that IPA domain sees AD users but AD domain doesn't seeIPA users. Am I missing something or the two-way trust is not two-wayin fact?It is two-way in principle. However, FreeIPA does not implement featuresrequired by AD DC to resolve IPA users on Windows workstations. It is onour long term roadmap. -- / Alexander BokovoySr. Principal Software EngineerSecurity / Identity Management EngineeringRed Hat Limited, Finland_______________________________________________FreeIPA-users mailing list -- freeipa-users@lists.fedorahosted.orgTo unsubscribe send an email to freeipa-users-leave@lists.fedorahosted.orgFedora Code of Conduct: https://getfedora.org/code-of-conduct.htmlList Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelinesList Archives: https://lists.fedoraproject.org/archives/list/freeipa-users@lists.fedorahost...
Hi all,
Thanks! This explains a lot, I'm happy :)
Winfried
Alexander Bokovoy via FreeIPA-users schreef op 26-10-2018 11:16:
On pe, 26 loka 2018, Winfried de Heiden wrote:
Hi all,
Refering to this bit of older post,
What now the difference between a One-way or Two-Way Trust anyway....? The docs are not too clear abut it:
" Two-way trust enables AD users and groups to access resources in IdM. However, the two-way trust in IdM does not give the users any additional rights compared to the one-way trust solution in AD. Both solutions are considered equally secure because of default cross-forest trust SID filtering settings"
What a use-case for using a Two-Way Trust? (since Windows cannot use IPA as a AD replacement)
Originally we implemented two-way trust first because it was easier to do than one-way trust from technical perspective. It allowed machines from IPA domain to directly query AD DCs about needed information using their own host/... Kerberos principals for authentication purposes.
However, a lot of customers were concerned with with AD trusting IPA because it wasn't how AD domain controllers resolved identities (and ran authentication proxying) over trust. We implemented one-way trust with a proper setup and actually moved to always use the credentials one-way-like in two-way trust too with FreeIPA 4.6/latest SSSD 1.15/1.16.
However, there is one missing part for a one-way trust: a one-way trust with a shared secret. If you are using a shared secret that is provided to you by AD admins (as opposed to be generated by 'ipa trust-add' automatically), one-way trust cannot be established. A long story short, both FreeIPA and SSSD lacked required logic to allow Windows to perform validation of the trust in this case from a Windows UI and we couldn't initiate the validation from IPA side as we didn't have administrative credentials to AD DCs.
So right now two-way trust with a shared secret is your solution for this case, although I'd rather suggest to establish a normal one-way trust with AD admin credentials to get a stronger trust secret generated for you by 'ipa trust-add'.
Winfried
-----Oorspronkelijk bericht----- Van: Alexander Bokovoy via FreeIPA-users freeipa-users@lists.fedorahosted.org Antwoord-naar: FreeIPA users list freeipa-users@lists.fedorahosted.org Aan: FreeIPA users list freeipa-users@lists.fedorahosted.org Cc: Michal Sladek michal@sladkovi.eu, Alexander Bokovoy abokovoy@redhat.com Onderwerp: [Freeipa-users] Re: Is IPA-AD two-way trust really two-way? Datum: Thu, 23 Aug 2018 12:08:17 +0300
On to, 23 elo 2018, Michal Sladek via FreeIPA-users wrote: Hello, I would like to use IPA server in heterogeneous environment with Linux servers and Windows workstations.IPA domain would be used as a primary source of users and groups.AD domain would be used for management of Widows hosts only (group policies etc.). I have setup a test network with two-trust between AD and IPA domainand realized, that IPA domain sees AD users but AD domain doesn't seeIPA users. Am I missing something or the two-way trust is not two-wayin fact?It is two-way in principle. However, FreeIPA does not implement featuresrequired by AD DC to resolve IPA users on Windows workstations. It is onour long term roadmap. -- / Alexander BokovoySr. Principal Software EngineerSecurity / Identity Management EngineeringRed Hat Limited, Finland_______________________________________________FreeIPA-users mailing list -- freeipa-users@lists.fedorahosted.orgTo unsubscribe send an email to freeipa-users-leave@lists.fedorahosted.orgFedora Code of Conduct: https://getfedora.org/code-of-conduct.htmlList Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelinesList Archives: https://lists.fedoraproject.org/archives/list/freeipa-users@lists.fedorahost...
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