Date: Wed, 13 Apr 2022 14:11:22 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Ronald Klop <ronald-lists@klop.ws>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: Sanity limit for length of user/group names? Message-ID: <YT2PR01MB9730DEB55A48C0029FF4082BDDEC9@YT2PR01MB9730.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <YT2PR01MB973032842BD187D08DD0D1B6DDEC9@YT2PR01MB9730.CANPRD01.PROD.OUTLOOK.COM> References: <YT2PR01MB97304F4066E62581CF01DC00DDEC9@YT2PR01MB9730.CANPRD01.PROD.OUTLOOK.COM> <837488522.1046.1649831759547@localhost> <YT2PR01MB973032842BD187D08DD0D1B6DDEC9@YT2PR01MB9730.CANPRD01.PROD.OUTLOOK.COM>
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Rick Macklem <rmacklem@uoguelph.ca> wrote: > Ronald Klop <ronald-lists@klop.ws> wrote: > > Hi, > > > > A google search gives me this page: https://forums.freebsd.org/threads/username-length-16.28189/ . > > It talks about MAXLOGNAME and limits in utmp. > Yep, I had forgotten about that one. > However, it is very small (and can be increased for a build) and I think it only applies > to user names and not group names. > > When I look in getgrent.c, the only limit I see is for the entire "struct group", which is > GRP_STORAGE_MAX, set to 1Mbyte. (1Mbyte seems larger than I would want to set > the sanity limit to.) > I'll experiment with a long group name and see what happens, at least for the local > /etc/group file case. I just tried a group with a name > 1K and it worked, so it does appear that the only limit is the 1Mbyte for the entire "struct group", at least for the local /etc/group file case. My current patch for the NFSv4 server uses 10K as a sanity limit and maybe I'll just stick with that. Thanks, rick Regards, Ronald Van: Rick Macklem <rmacklem@uoguelph.ca> Datum: 13 april 2022 03:08 Aan: freebsd-current <freebsd-current@freebsd.org> Onderwerp: Sanity limit for length of user/group names? Hi, The NFSv4 RFCs do not specify an upper limit for the length of a user or group (called Owner/Owner_group in NFSv4) string. However, PR#260546 notes that a sanity upper limit for their length is needed. Is there any constant in FreeBSD that defines the upper limit for the length of a user or group name? (I can find the maximum length of a hostname and I think that can be used as a safe upper limit for a domain name, as well. The Owner/ Owner_group names include "@domain" on them.) Thanks for any help with this, rick ________________________________help
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