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Fri, 29 Aug 2025 13:05:33 -0700 (PDT) List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@FreeBSD.org MIME-Version: 1.0 References: <56dd78c6-a53a-4c4c-989a-335cc5fed405@FreeBSD.org> <1578a4eac5402d0496d8989e5258bc78@Leidinger.net> In-Reply-To: From: Rick Macklem Date: Fri, 29 Aug 2025 13:05:20 -0700 X-Gm-Features: Ac12FXy5WWMiDD-okAO7MW5Zb4OJTGrR08twxf5ljfrHlv4yz2uWXhZrE0Uiyag Message-ID: Subject: Re: heimdal -> MIT kdc migration To: Gleb Smirnoff Cc: Cy Schubert , freebsd-current@freebsd.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spamd-Bar: --- X-Spamd-Result: default: False [-4.00 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36:c]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20230601]; MIME_GOOD(-0.10)[text/plain]; FREEMAIL_ENVFROM(0.00)[gmail.com]; RCVD_TLS_LAST(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TAGGED_FROM(0.00)[]; TO_DN_SOME(0.00)[]; FROM_HAS_DN(0.00)[]; MISSING_XM_UA(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; MID_RHS_MATCH_FROMTLD(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; MLMMJ_DEST(0.00)[freebsd-current@freebsd.org]; RCVD_COUNT_ONE(0.00)[1]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::535:from]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim] X-Rspamd-Queue-Id: 4cD8QX4wpsz3dd1 On Fri, Aug 29, 2025 at 7:43=E2=80=AFAM Rick Macklem wrote: > > On Wed, Aug 27, 2025 at 8:39=E2=80=AFPM Rick Macklem wrote: > > > > On Wed, Aug 27, 2025 at 7:43=E2=80=AFPM Rick Macklem wrote: > > > > > > On Tue, Aug 26, 2025 at 9:35=E2=80=AFAM Gleb Smirnoff wrote: > > > > > > > > On Tue, Aug 26, 2025 at 08:31:13AM -0700, Gleb Smirnoff wrote: > > > > T> On Tue, Aug 26, 2025 at 08:13:26AM -0700, Rick Macklem wrote: > > > > T> R> Ok. If you install FreeBSD-13.5 and then "pkg install heimdal= ", you get a > > > > T> R> working Heimdal-7.8 in ports. > > > > T> R> > > > > T> R> Now, I have another challenge. Fixing the master passwords. > > > > T> R> I'll work on it later to-day. > > > > T> > > > > T> I have applied two commits from Heimdal from 2012 that add 'kadm= in dump -f MIT' > > > > T> feature to our base heimdal and polished them to compile. So fa= r it doesn't > > > > T> work yet, either create an empty dump or create a core dump, ins= tead of > > > > T> database dump :) I'll see how difficult it is going to further r= esolve that to > > > > T> a working condition. If I succeed, then having 'dump -f MIT' in = base without > > > > T> any ports would be the best solution. Can also be merged to Fre= eBSD 14.4. > > > > > > > > Good news. In the above paragraph I was testing my change incorrec= tly - threw > > > > the new binary on a system running unpatched libraries. When run c= orrectly, > > > > it successfully produced something that looks like a correct dump i= n MIT format. > > > > I haven't yet tried to load it into MIT kdc yet, though. > > Oh, and one more thing... > > - If there are keys for old encryption types like des.. or arcfour.. > > in the MIT dump, > > those will screw up the load. (You can check and delete them in the > > Heimdal-1.5.2 > > kdc system via.. > > # kadmin -l > > get > > - if old keys are listed in Keytypes: > > del_enctype > > exit > > > > Ideally the conversion code would skip over these and not put them in = the dump. > > > > rick > > ps: If you don't do this, when you "get_principal" in kadmin.local on > > the MIT KDC > > system, it will give you a "Database record is incomplete or corr= upted..". > > > > > > > > > > I will finalize the branch promptly and share it. The above experi= ence also > > > > indicated that I need to do a library version bump. > > > I don't know if you are enthusiastic about pursuing this, but hopeful= ly this > > > works and gets the principals in (although I doubt the passwords will > > > work without changing them). > > > > > > To get the passwords to work, I think the following *might* do it: > > > - If you look in the Heimdal sources, when "--decrypt" is specified, > > > I think it finds its way down into a function called hdb_unseal_key= _mkey() > > > which decrypts the key using the master key by calling _hdb_mkey_de= crypt(). > > > To get the passwords to work, I think the call to _hdb_mkey_decrypt= () would > > > need to be followed by a call to _hdb_mkey_encrypt() with the "key" > > > argument being the master key for the MIT database. (It it a keytab > > > entry called /var/db/krb5kdc/.k5.YOUR.REALM created when you do a > > > "kdb5_util create -s" on the system that will be the MIT KDC.) > > > - Just to make it even more fun, there is a flag called HDB_KU_MKEY > > > which is set to the Heimdal way and not for the MIT way (whatever > > > that really means?). > > > - There is also some stuff about padding in hdb_unseal_key_mkey(), > > > but hopefully that won't be a problem? > > > > > > I think hdb_read_master_key() can be used to read in the MIT master > > > key from the file you provide as an argument to it. > > > > > > This all is just a hunch, based on what I've seen so far. > > > > > > I'll admit since the hardware I have takes forever to "make buildworl= d" > > > and I don't know a quick way to build/test these changes, I'm not > > > inspired to try it. > Although not inspired, I have taken a stab at it. > I am still trying to figure out how to build/test it, but I have forked > glebius@'s github and added some code to... > - Not dump the weak encryption keys (they just cause MIT's kadmin.local > to complain that the principal's database entry is corrupted. > - If the argument to "kadmin -l dump" is "-f " inste= ad > of "-f MIT" it re-encrypts the keys in MIT's master key. (I hope that w= ill > make the passwords work. > (Basically, someone will "kdb5_util create -s" on the MIT KDC system > and then copy the /var/db/krbkdc/.k5.YOUR.REALM file over to the > Heimdal KDC system and do "kadmin -l dump -f <.k5-filename> mit.dump" > then copy "mit.dump" over to the MIT KDC system and > "kdb5_util load -update mit.dump". Then, hopefully, the principals wil= l > work??) > > Anyhow, it is currently sitting here: > github.com/rmacklem/FreeBSD in the kadmin-dump-MIT branch. > (I'm as unconversant with git and github as anyone, so if you have > trouble finding it, just let me know.) Actually, it hasn't made it there yet. For some reason (I think it is glebius@s large # of branches) it takes a very long time to "git push" a patch involving 4 files. It failed after over an hour with an unexpected TCP disconnect. I am running it again. I will stick the patch here, in case the push fails again. (It needs to be applied on top of glebius@'s kadmin-dump-MIT branch. https://people.freebsd.org/~rmacklem/kadmin.patch Meanwhile I've given up trying to build it on a universe system and an now trying the "make buildworld" locally. This will take days, so I guess I'll go do something else.;-) rick > > I'll keep updating this github fork as I get to test it, but if others > know how to build it, feel free to test, rick > > > > > > > rick > > > > > > > > > > > -- > > > > Gleb Smirnoff