Hi Jeff, On Пан, 31 сак 2025, Jeff McCashland (He/him) wrote: > Hi Alexander and Julian, > > You may have noticed that this issue was also addressed in the verification I > sent last Thursday: > > 2.2.3 PA-PK-AS-REQ > PKAuthenticator in [RFC4556] is extended to add the following PAChecksum2. If > SHA-1 is disabled as a checksum algorithm PAChecksum2 SHOULD be present; if > this field is present, it will always be validated even if it is SHA-1.<11> > <11> Section 2.2.3: The extension of PKAuthenticator in PA-PK-AS-REQ is > applies to Windows Server 2022, 23H2 operating system. and later versions. > Windows Server 2022, 23H2 and later DCs will send back > TD-CMS-DIGEST-ALGORITHMS-DATA as described in [RFC8636] section 4, CMS Digest > > On supported versions of Windows, PAChecksum2 is validated if any one of the > following conditions is true: > 1. The field is present > 2. If an EC algorithm is not allowed and the signedAuthPack algorithm is > not SHA-1 > 3. SHA-1 is disabled > > Let us know if you find anything else.
Thank you! I think we are good with this update. > > > Best regards, > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft Corporation > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: (UTC-08:00) > Pacific Time (US and Canada) > > Local country phone number found here: > http://support.microsoft.com/globalenglish | Extension 1138300 > > > > ________________________________ > From: Jeff McCashland (He/him) <[email protected]> > Sent: Friday, March 14, 2025 12:58 PM > To: Alexander Bokovoy <[email protected]> > Cc: Julien Rische <[email protected]>; [email protected] > <[email protected]>; Microsoft Support <[email protected]> > Subject: [MS-PKCA] 2.2.3 PA-PK-AS-REQ: Message must be present clarification > - TrackingID#2503140040011974 > > Hi Alexander, > > I noticed that was in the original text, so we created a new SR > 2503140040011974 to track this issue. I will file a request to correct the > spec and follow up. I think you're correct that it should be 'field' instead > of 'message'. > > Thank you for pointing this out. Let us know what else you find. > > > Best regards, > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft Corporation > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: (UTC-08:00) > Pacific Time (US and Canada) > > Local country phone number found here: > http://support.microsoft.com/globalenglish | Extension 1138300 > > > > ________________________________ > From: Jeff McCashland (He/him) <[email protected]> > Sent: Friday, March 14, 2025 10:45 AM > To: Alexander Bokovoy <[email protected]> > Cc: Julien Rische <[email protected]>; [email protected] > <[email protected]>; Microsoft Support <[email protected]> > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT regression > - TrackingID#2412190040009154 > > Good catch, let me check on that. > > ________________________________ > From: Alexander Bokovoy <[email protected]> > Sent: Friday, March 14, 2025 5:26 AM > To: Jeff McCashland (He/him) <[email protected]> > Cc: Julien Rische <[email protected]>; [email protected] > <[email protected]>; Microsoft Support <[email protected]> > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT regression > - TrackingID#2412190040009154 > > Hi Jeff, > > On Чцв, 13 сак 2025, Jeff McCashland (He/him) wrote: > > Hi Alexander, > > > > We have updated [MS-PKCA] for the next release to address this issue: > > 2.2.3 PA-PK-AS-REQ > > PKAuthenticator in [RFC4556] is extended to add the following > > PAChecksum2<11>. If a checksum algorithm other than SHA-1 is used, this > > message MUST be present. If this field is present, it will always be > > validated even if it is SHA-1. > > [...] > > PAChecksum2 follows the freshness token octet string added in > > [RFC8070]<https://go.microsoft.com/fwlink/?linkid=842519>. > > Please let us know if you find anything else. > > I am confused: 'this message MUST be present' should probably read 'this > field MUST be present'. Right? > > > > > > > > Best regards, > > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft > > Corporation > > > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: (UTC-08:00) > > Pacific Time (US and Canada) > > > > Local country phone number found here: > > https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201447644%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=FAzNVAqdWtUxNGhMPR%2Fn8sX5eVPiuXQapgTrMez8DKk%3D&reserved=0<http://support.microsoft.com/globalenglish> > > | Extension 1138300 > > > > > > > > ________________________________ > > From: Jeff McCashland (He/him) <[email protected]> > > Sent: Monday, January 13, 2025 11:39 AM > > To: Alexander Bokovoy <[email protected]> > > Cc: Julien Rische <[email protected]>; [email protected] > > <[email protected]>; Microsoft Support > > <[email protected]> > > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > regression - TrackingID#2412190040009154 > > > > Hi Alexander, > > > > Excellent observation. The paChecksum2 value follows the freshness token. > > > > typedef struct PKAuthenticator { > > union { > > ASN1uint16_t bit_mask; > > ASN1octet_t o[1]; > > }; > > ASN1uint32_t cusec; > > KERB_TIME client_time; > > ASN1uint32_t nonce; > > # define paChecksum_present 0x80 > > ASN1octetstring_t paChecksum; > > # define freshnessToken_present 0x40 > > ASN1octetstring_t freshnessToken; > > # define paChecksum2_present 0x20 > > PAChecksum2 paChecksum2; > > } PKAuthenticator; > > > > I will follow up and request any needed documentation updates. > > > > > > Best regards, > > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft > > Corporation > > > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: (UTC-08:00) > > Pacific Time (US and Canada) > > > > Local country phone number found here: > > https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201463385%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=QZ%2FBGA4lram%2FXxSExR4mD32dfS%2FKyKG9nW7%2BCnrDO2I%3D&reserved=0<http://support.microsoft.com/globalenglish> > > | Extension 1138300 > > > > > > > > ________________________________ > > From: Alexander Bokovoy <[email protected]> > > Sent: Monday, January 13, 2025 11:33 AM > > To: Jeff McCashland (He/him) <[email protected]> > > Cc: Julien Rische <[email protected]>; [email protected] > > <[email protected]>; Microsoft Support > > <[email protected]> > > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > regression - TrackingID#2412190040009154 > > > > Hi Jeff, > > > > On Пан, 13 сту 2025, Jeff McCashland (He/him) wrote: > > > Hi Julien and Alexander, > > > > > > What I found in the trace is that the server is finding a paChecksum, but > > > no paChecksum2, which is required when using anything other than SHA-1: > > > > > > [MS-PKCA] 2.2.3 PA-PK-AS-REQ > > > The PA-PK-AS-REQ message format is specified in [RFC4556] section > > > 3.2.1.<10> PKAuthenticator in [RFC4556] is extended to add the > > > following PAChecksum2<11>. If a checksum algorithm other than SHA-1 is > > > used, this message MUST be present. If this field is present, it will > > > always be validated even if it is SHA-1. > > > PAChecksum2 ::= SEQUENCE { > > > checksum [0] OCTET STRING, > > > algorithmIdentifier [1] KERB-ALGORITHM-IDENTIFIER > > > } > > > <11> Section 2.2.3: The extension of PKAuthenticator in PA-PK-AS-REQ > > > is only applicable to Windows Server 2022, 23H2 operating system. > > > Windows Server 2022, 23H2 DCs will send back > > > TD-CMS-DIGEST-ALGORITHMS-DATA as described in [RFC8636] section 4. CMS > > > Digest Algorithm Agility. > > > > > > I believe the solution is to add a paChecksum2 to the PA-PK-AS-REQ. Let > > > me know if you have any questions. > > > > Thank you for pointing this out. > > > > There is one problem, though. RFC 8070 extends PKAuthenticator as well, > > by adding freshnessToken right after paChecksum: > > https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8070%23section-4&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201471635%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=5B51o0aWCo0CbwYQjKpdmuPeH2wkZw0eVJGo0RTHUUM%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8070%23section-4&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201480344%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=KxHFqtioenrnkMqBOTcIY0S9r9lzt04qtgS0BnPWglQ%3D&reserved=0><https://datatracker.ietf.org/doc/html/rfc8070#section-4> > > > > PKAuthenticator ::= SEQUENCE { > > cusec [0] INTEGER (0..999999), > > ctime [1] KerberosTime, > > -- cusec and ctime are used as in [RFC4120], for > > -- replay prevention. > > nonce [2] INTEGER (0..4294967295), > > -- Chosen randomly; this nonce does not need to > > -- match with the nonce in the KDC-REQ-BODY. > > paChecksum [3] OCTET STRING OPTIONAL, > > -- MUST be present. > > -- Contains the SHA1 checksum, performed over > > -- KDC-REQ-BODY. > > ..., > > freshnessToken [4] OCTET STRING OPTIONAL, > > -- PA_AS_FRESHNESS padata value as received from the > > -- KDC. MUST be present if sent by KDC > > ... > > } > > > > Can you please expand on whether paChecksum2 is added after or before > > the freshnessToken? e.g. does paChecksum2 has index [5] or [4]? > > > > If it is indeed paChecksum2 [5], then a reference to RFC 8070 is missing > > in the MS-PKCA 2.2.3. > > > > I think MS-PKCA would need an update about this detail as MS-PKCA 3.1.5 > > explicitly states: > > > > PKCA SHOULD<14> support the PKINIT Freshness Extension [RFC8070]. > > > > so MS-PKCA 2.2.3 would need to refer to RFC8070, not just to RFC4556. > > > > > > > > > > > > > Best regards, > > > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft > > > Corporation > > > > > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: (UTC-08:00) > > > Pacific Time (US and Canada) > > > > > > Local country phone number found here: > > > https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201488920%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=SavrR48GZLJMc%2Fv20dycTO4XiPv0iFAdlFyUx8d%2FZzg%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201499298%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=c%2FrpZgvEnZ9ZpxFIvwwsuW%2B3zpogVbYvExPpvEyKhU0%3D&reserved=0><http://support.microsoft.com/globalenglish> > > > | Extension 1138300 > > > > > > > > > > > > ________________________________ > > > From: Jeff McCashland (He/him) <[email protected]> > > > Sent: Tuesday, January 7, 2025 1:16 PM > > > To: Julien Rische <[email protected]> > > > Cc: Alexander Bokovoy <[email protected]>; [email protected] > > > <[email protected]>; Microsoft Support > > > <[email protected]> > > > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > > regression - TrackingID#2412190040009154 > > > > > > Thank you for the rapid response and for uploading the additional traces. > > > I will dig into these and let you know what I find. > > > > > > > > > Best regards, > > > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft > > > Corporation > > > > > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: (UTC-08:00) > > > Pacific Time (US and Canada) > > > > > > Local country phone number found here: > > > https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201509258%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=mtL73Gw7oFG4cc4nWdSVm%2BG0fq2ukkQQnOT23LhDSSI%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201517831%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=FPosCwkQUaIPOi8CU1P3IQBoYK5TfBL0QGtkoihs194%3D&reserved=0><http://support.microsoft.com/globalenglish> > > > | Extension 1138300 > > > > > > > > > > > > ________________________________ > > > From: Julien Rische <[email protected]> > > > Sent: Tuesday, January 7, 2025 11:33 AM > > > To: Jeff McCashland (He/him) <[email protected]> > > > Cc: Alexander Bokovoy <[email protected]>; [email protected] > > > <[email protected]>; Microsoft Support > > > <[email protected]> > > > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > > regression - TrackingID#2412190040009154 > > > > > > Hello Jeff, > > > > > > I uploaded 5 additional files, including the LSASS traces obtained > > > following the procedure described in your previous message: > > > > > > [02_lsass_pkinit_ffdh_modp14.zip] Compressed LSASS trace of a failing > > > pre-authentication process for FFDH with MODP group 14 (2046-bit) and > > > RSA/SHA-256 signature. > > > [02_pkinit_ffdh_modp14.pcap] Network trace of a failing > > > pre-authentication process for FFDH with MODP group 14 (2046-bit) and > > > RSA/SHA-256 signature. > > > [02_lsass_pkinit_ecdh_p256.zip] Compressed LSASS trace of a successful > > > pre-authentication process for ECDH with curve P-256 and RSA/SHA-256 > > > signature. > > > [02_pkinit_ecdh_p256.pcap] Network trace of a successful > > > pre-authentication process for ECDH with curve P-256 and RSA/SHA-256 > > > signature. > > > [02_ad2025.keytab] All Kerberos keys in the AD domain. > > > > > > -- > > > Julien Rische > > > > > > On Mon, Jan 6, 2025 at 9:03 PM Jeff McCashland (He/him) > > > <[email protected]> wrote: > > > > > > > > Hi Julien, > > > > > > > > Thank you for uploading the net traces and information. Please follow > > > > the instructions below to collect an LSASS trace of the scenario where > > > > you get the KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED error ('unknown' error > > > > code 79 from Alexander's original description). > > > > > > > > The LSASS traces can be quite large, but are highly compressible, so > > > > please add them to a .zip archive before uploading (file transfer > > > > workspace link is below). Please log into the workspace and find > > > > PartnerTTDRecorder_x86_x64.zip available for download. The x64 tool can > > > > be staged onto the Windows server in any location (instructions below > > > > assume C:\TTD). > > > > > > > > To collect the needed traces: > > > > 1. From a PowerShell prompt, execute: > > > > C:\TTD\tttracer.exe -Attach ([int](Get-Process -NAME lsass | > > > > Format-Wide -Property > > > > ID).formatEntryInfo.formatPropertyField.propertyValue) > > > > 2. Wait for a little window to pop up in top left corner of your > > > > screen, titled “lsass01.run” > > > > 3. start a network trace using netsh or WireShark, etc. > > > > 4. Repro the attempted operation > > > > 5. Stop the network trace and save it > > > > 6. CAREFULLY: uncheck the checkbox next to “Tracing” in the small > > > > “lsass01.run” window. Do not close or exit the small window or you will > > > > need to reboot. > > > > 7. The TTTracer.exe process will generate a trace file, then print out > > > > the name and location of the file. > > > > Compress the *.run file into a .zip archive before uploading with the > > > > matching network trace. It is a good idea to reboot the machine at the > > > > next opportunity to restart the lsass process. > > > > > > > > Best regards, > > > > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft > > > > Corporation > > > > > > > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: > > > > (UTC-08:00) Pacific Time (US and Canada) > > > > > > > > Local country phone number found here: > > > > https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201525864%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=2P%2BFFEoo8inbYyMXH36rtY5h8W0Rz%2BIn%2FiyLeixYGWw%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201533850%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=MDTEgc5K4ki%2F8Vt6HdCn%2FO2zaRH0H1qUnqAlTKnlbZ4%3D&reserved=0><https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201542079%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=11cVgxTUlrejmLdN4mn18EGkTM1njm%2B3KgdR4Bb8oUA%3D&reserved=0><http://support.microsoft.com/globalenglish> > > > > | Extension 1138300 > > > > > > > > > > > > > > > > ________________________________ > > > > From: Julien Rische <[email protected]> > > > > Sent: Monday, January 6, 2025 2:27 AM > > > > To: Jeff McCashland (He/him) <[email protected]> > > > > Cc: Alexander Bokovoy <[email protected]>; [email protected] > > > > <[email protected]>; Microsoft Support > > > > <[email protected]> > > > > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > > > regression - TrackingID#2412190040009154 > > > > > > > > Hello Jeff, > > > > > > > > I uploaded the network traces to the file transfer link you provided: > > > > > > > > [00_ad2025.pcap] Network trace of a failing pre-authentication process > > > > with RSA/SHA-256 and RSA/SHA-512 as supportedCMSTypes. > > > > [00_ad2025_sha1.pcap] Network trace of a failing pre-authentication > > > > process with RSA/SHA-256, RSA/SHA-512, and RSA/SHA-1 as > > > > supportedCMSTypes. > > > > [00_ad2025.keytab] All Kerberos keys in the AD domain. > > > > > > > > [01_gp_pkinit_digest.png] Screenshot of the "Computer > > > > Configuration\Policies\Administrative Templates\System\KDC\Configure > > > > hash algorithms for certificate logon" global policy settings. > > > > [01_pkinit_ffdh_modp14.pcap] Network trace of a failing > > > > pre-authentication process for FFDH with MODP group 14 (2046-bit) and > > > > RSA/SHA-256 signature. > > > > [01_pkinit_ecdh_p256.pcap] Network trace for a successful > > > > pre-authentication process for ECDH with curve P-256 and RSA/SHA-256 > > > > signature. > > > > [01_ad2025.keytab] All Kerberos keys in the AD domain. > > > > > > > > My Microsoft account uses the present email address: [email protected] > > > > > > > > -- > > > > Julien Rische > > > > > > > > On Fri, Jan 3, 2025 at 9:12 PM Jeff McCashland (He/him) > > > > <[email protected]> wrote: > > > > > > > > > > Hello Julien and Alexander, > > > > > > > > > > Actually, what we need to troubleshoot this issue is to collect a TTD > > > > > trace of the LSASS process. In order to download the tool needed to > > > > > collect the trace, you will need a Microsoft account. These can be > > > > > created free at live.com. > > > > > > > > > > Please send me the Microsoft account email address you will use to > > > > > download the tools, and I will send the link. > > > > > > > > > > Best regards, > > > > > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft > > > > > Corporation > > > > > > > > > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: > > > > > (UTC-08:00) Pacific Time (US and Canada) > > > > > > > > > > Local country phone number found here: > > > > > https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201550045%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=n9E8bNFTPdx0AjqWFecQNtaWm5VKmozgoLBj1V12KdU%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201558233%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=QwL1a8aDSx41FtpVv6aginn3ImXJSo8sK4pMBB8m4ZQ%3D&reserved=0><https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201566706%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=RGbjIhl%2FIObIk6qrBDpCn8cmGeD8BynruOyqWQu8Yuw%3D&reserved=0><http://support.microsoft.com/globalenglish> > > > > > | Extension 1138300 > > > > > > > > > > > > > > > > > > > > > > > > > ________________________________ > > > > > From: Jeff McCashland (He/him) <[email protected]> > > > > > Sent: Friday, December 27, 2024 11:30 AM > > > > > To: Julien Rische <[email protected]>; Alexander Bokovoy > > > > > <[email protected]> > > > > > Cc: [email protected] <[email protected]>; > > > > > Microsoft Support <[email protected]> > > > > > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > > > > regression - TrackingID#2412190040009154 > > > > > > > > > > Hi Julien and Alexander, > > > > > > > > > > Alexander mentioned ad2025.pcap and ad2025_sha1.pcap, and Julien > > > > > mentioned 2 additional unnamed captures. > > > > > > > > > > Please upload any relevant traces to the link below, as we are not > > > > > allowed to accept files by email. Also, it would help if you could > > > > > specify which traces and frames relate to which aspects of your > > > > > question, that would save time. > > > > > > > > > > Also, it's not clear to me (yet), if the additional information from > > > > > Julien modifies or answers any part of Alexander's original question. > > > > > > > > > > Secure file link: > > > > > 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> > > > > > > > > > Best regards, > > > > > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft > > > > > Corporation > > > > > > > > > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: > > > > > (UTC-08:00) Pacific Time (US and Canada) > > > > > > > > > > Local country phone number found here: > > > > > https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201601445%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=sm6ZwJ8%2FMSUVUqKr2Et6Fr7RlMCqLyaLuNDhwAEh06o%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201609740%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=FADUAluqsPVJirbN7o0cSPSz8Gs5aXRtOm6onAod%2F7U%3D&reserved=0><https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201618673%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=dOZTspzmBzm4nt9L8pXhhR0ng7FfecOvpjRhDJniUWQ%3D&reserved=0><http://support.microsoft.com/globalenglish> > > > > > | Extension 1138300 > > > > > > > > > > > > > > > > > > > > ________________________________ > > > > > From: Jeff McCashland (He/him) <[email protected]> > > > > > Sent: Monday, December 23, 2024 8:29 PM > > > > > To: Julien Rische <[email protected]> > > > > > Cc: [email protected] <[email protected]>; > > > > > Alexander Bokovoy <[email protected]>; Microsoft Support > > > > > <[email protected]> > > > > > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > > > > regression - TrackingID#2412190040009154 > > > > > > > > > > [Kristian to BCC] > > > > > > > > > > Hi Julien, > > > > > > > > > > I will investigate your question, and get back to you. I am out the > > > > > next 2 days for holiday, back on Thursday. > > > > > > > > > > > > > > > Best regards, > > > > > Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft > > > > > Corporation > > > > > > > > > > Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: > > > > > (UTC-08:00) Pacific Time (US and Canada) > > > > > > > > > > Local country phone number found here: > > > > > https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201626712%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=yLqHXQti33Ik%2FxFhHED8ACnYTwEtM%2BRnGDFU9qVhh7c%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201634640%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=b296PocZIzJPVi7NPlARWIEz3lDgEKHgdXUHrTmsl2s%3D&reserved=0><https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsupport.microsoft.com%2Fglobalenglish&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201642822%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=L2G6V0MGgJc4iiIjoQ0nklCymPZr%2Fjioxtn5pfytIVc%3D&reserved=0><http://support.microsoft.com/globalenglish> > > > > > | Extension 1138300 > > > > > > > > > > > > > > > > > > > > ________________________________ > > > > > From: Kristian Smith <[email protected]> > > > > > Sent: Monday, December 23, 2024 1:31 PM > > > > > To: Julien Rische <[email protected]>; Jeff McCashland (He/him) > > > > > <[email protected]> > > > > > Cc: [email protected] <[email protected]>; > > > > > Alexander Bokovoy <[email protected]>; Microsoft Support > > > > > <[email protected]> > > > > > Subject: RE: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > > > > regression - TrackingID#2412190040009154 > > > > > > > > > > [Mike to Bcc, adding Jeff]] > > > > > Hi Julien, > > > > > > > > > > Thanks for the information. Also, after some workload adjustments, > > > > > @Jeff McCashland will be working on your case moving forward. > > > > > > > > > > Apologies for the confusion. > > > > > > > > > > Regards, > > > > > Kristian Smith > > > > > Support Escalation Engineer | Microsoft® Corporation > > > > > Email: [email protected] > > > > > > > > > > -----Original Message----- > > > > > From: Michael Bowen <[email protected]> > > > > > Sent: Monday, December 23, 2024 10:05 AM > > > > > To: Julien Rische <[email protected]>; Kristian Smith > > > > > <[email protected]> > > > > > Cc: Alexander Bokovoy <[email protected]>; > > > > > [email protected]; Microsoft Support > > > > > <[email protected]> > > > > > Subject: RE: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > > > > regression - TrackingID#2412190040009154 > > > > > > > > > > Hi Julien, > > > > > > > > > > Thanks for the update. @Kristian Smith is handling your case, so I'm > > > > > forwarding this to him to help him with your issue. Happy Holidays! > > > > > > > > > > - Michael > > > > > > > > > > -----Original Message----- > > > > > From: Julien Rische <[email protected]> > > > > > Sent: Monday, December 23, 2024 5:32 AM > > > > > To: Michael Bowen <[email protected]> > > > > > Cc: Alexander Bokovoy <[email protected]>; > > > > > [email protected]; Microsoft Support > > > > > <[email protected]> > > > > > Subject: Re: [cifs-protocol] [EXTERNAL] Windows Server 2025 PKINIT > > > > > regression - TrackingID#2412190040009154 > > > > > > > > > > [You don't often get email from [email protected]. Learn why this is > > > > > important at https://aka.ms/LearnAboutSenderIdentification ] > > > > > > > > > > Hello Michael, > > > > > > > > > > It has come to our attention that Windows Server 2025 now has support > > > > > for allowing and disallowing digest algorithms in PKINIT. We made > > > > > some tests by modifying the "Computer > > > > > Configuration\Policies\Administrative > > > > > Templates\System\KDC\Configure hash algorithms for certificate logon". > > > > > > > > > > This configuration seems to take effect, because disallowing SHA-256 > > > > > causes elliptic curve Diffie-Hellman to fail. However, allowing all > > > > > SHA versions does not fix the problem when using finite field > > > > > Diffie-Hellman. > > > > > > > > > > In attachment, you will find 2 network traces showing a successful > > > > > pre-authentication process for ECDH with curve P-256 and RSA/SHA-256 > > > > > signature, and a failing one for FFDH with MODP group 14 (2046-bit) > > > > > and RSA/SHA-256 signature. In both cases all SHA versions are allowed > > > > > in the above group policy. > > > > > > > > > > -- > > > > > Julien Rische > > > > > > > > > > > > > > > On Thu, Dec 19, 2024 at 5:33 PM Michael Bowen via cifs-protocol > > > > > <[email protected]> wrote: > > > > > > > > > > > > [DocHelp to bcc] > > > > > > > > > > > > Hi Alexander, > > > > > > > > > > > > Thanks for your question about Windows Server 2025 and Kerberos. > > > > > > I've created case number 2412190040009154 to track this issue, > > > > > > please leave the number in the subject line when communicating with > > > > > > our team. One of our engineers will contact you soon. > > > > > > > > > > > > Best regards, > > > > > > Michael Bowen > > > > > > Sr. Escalation Engineer - Microsoft® Corporation > > > > > > > > > > > > -----Original Message----- > > > > > > From: Alexander Bokovoy <[email protected]> > > > > > > Sent: Thursday, December 19, 2024 4:26 AM > > > > > > To: Interoperability Documentation Help <[email protected]> > > > > > > Cc: [email protected] > > > > > > Subject: [EXTERNAL] Windows Server 2025 PKINIT regression > > > > > > > > > > > > [Some people who received this message don't often get email from > > > > > > [email protected]. Learn why this is important at > > > > > > https://aka.ms/LearnAboutSenderIdentification ] > > > > > > > > > > > > Hi Dochelp, > > > > > > > > > > > > I believe we are seeing a regression in how Windows Server 2025 > > > > > > handles Kerberos PKINIT, probably due to algorithm agility rewrite. > > > > > > > > > > > > Sometime ago we have updated MIT Kerberos implementation of PKINIT > > > > > > to use sha256WithRSAEncryption in supported CMS types and removed > > > > > > sha1WithRSAEncryption to be able compliant with FIPS 140-3. > > > > > > > > > > > > The commit > > > > > > https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgith%2F&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201650872%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=1KKkHd01dhfeyPnuGhastrJVuc7tx4m4PKKoykKk3hw%3D&reserved=0<https://gith/><https://gith/><https://gith/> > > > > > > %2F&data=05%7C02%7CKristian.Smith%40microsoft.com%7Ccc530a51018e45fbf1 > > > > > > b108dd237c4865%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C6387057388 > > > > > > 76787487%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuM > > > > > > DAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&s > > > > > > data=vvBUg7U6QcAQSKEUYyCOQ1A78VoSp5eDylGA9lRz0zI%3D&reserved=0 > > > > > > ub.com%2Fkrb5%2Fkrb5%2Fcommit%2Fcbfe46ce20f3e9265baa9c648390148c739ab8 > > > > > > 30&data=05%7C02%7Cmike.bowen%40microsoft.com%7C6c48431e145e4de8500c08d > > > > > > d23562d38%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638705575372721 > > > > > > 071%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMC > > > > > > IsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata= > > > > > > BKt0Ke6K6mn1ONoQTBrHhhybs8HASTsXpFQC4qPKjKo%3D&reserved=0 > > > > > > is part of MIT Kerberos 1.20 or later releases. > > > > > > > > > > > > This change worked well for Windows Server versions prior to > > > > > > Windows Server 2025 release. With Windows Server 2025, the request > > > > > > is rejected (packet 8 from ad2025.pcap in attached archive): > > > > > > > > > > > > Kerberos > > > > > > Record Mark: 106 bytes > > > > > > 0... .... .... .... .... .... .... .... = Reserved: Not set > > > > > > .000 0000 0000 0000 0000 0000 0110 1010 = Record Length: 106 > > > > > > krb-error > > > > > > pvno: 5 > > > > > > msg-type: krb-error (30) > > > > > > stime: Dec 18, 2024 15:22:36.000000000 CET > > > > > > susec: 926640 > > > > > > error-code: Unknown (79) > > > > > > realm: WIN2025-UO83.TEST > > > > > > sname > > > > > > name-type: kRB5-NT-SRV-INST (2) > > > > > > sname-string: 2 items > > > > > > SNameString: krbtgt > > > > > > SNameString: WIN2025-UO83.TEST > > > > > > > > > > > > > > > > > > We built a custom version of MIT Kerberos which adds both > > > > > > sha256WithRSAEncryption and sha1WithRSAEncryption to the list of > > > > > > supported CMS types and still signed with sha256WithRSAEncryption, > > > > > > it failed again. The corresponding packet exchange can be seen in > > > > > > ad2025_sha1.pcap in the attached archive. > > > > > > > > > > > > Both variants work against Windows Server 2019, so to us this looks > > > > > > like a regression in Windows Server 2025 implementation. > > > > > > > > > > > > If this is not a regression and instead it is an intentional > > > > > > change, could you please make sure MS-PKCA and other corresponding > > > > > > documents get updated with a proper logic of the changes. > > > > > > > > > > > > -- > > > > > > / Alexander Bokovoy > > > > > > > > > > > > _______________________________________________ > > > > > > cifs-protocol mailing list > > > > > > [email protected] > > > > > > https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist%2F&data=05%7C02%7Cjeffm%40microsoft.com%7C862b2d176ab644e792c408dd62f37f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638775520201661964%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=7xGNol4wfLL%2BSQMUdoXkGyoUkgicAn84d5wJrDNBjvI%3D&reserved=0<https://list/><https://list/><https://list/> > > > > > > %2F&data=05%7C02%7CKristian.Smith%40microsoft.com%7Ccc530a51018e45fbf1 > > > > > > b108dd237c4865%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C6387057388 > > > > > > 76806372%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuM > > > > > > DAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&s > > > > > > data=0Qe6AszCxK%2BkbB47AYraNMeMmtEj88GZtfXvR5jNs1I%3D&reserved=0 > > > > > > s.samba.org%2Fmailman%2Flistinfo%2Fcifs-protocol&data=05%7C02%7Cmike.b > > > > > > owen%40microsoft.com%7C6c48431e145e4de8500c08dd23562d38%7C72f988bf86f1 > > > > > > 41af91ab2d7cd011db47%7C1%7C0%7C638705575372737510%7CUnknown%7CTWFpbGZs > > > > > > b3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIj > > > > > > oiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=JoGoaTxJzMm7ljVciNww4Tdd > > > > > > UpV9bcqS3whR%2F8JTLVA%3D&reserved=0 > > > > > > > > > > > > > > > > > > > -- > > / Alexander Bokovoy > > > -- > / Alexander Bokovoy -- / Alexander Bokovoy _______________________________________________ cifs-protocol mailing list [email protected] https://lists.samba.org/mailman/listinfo/cifs-protocol
