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Are you sure you haven't just exceeded this limit? rick ________________________________________ From: owner-freebsd-current@freebsd.org = on behalf of Yasuhiro Kimura Sent: Tuesday, March 15, 2022 12:48 PM To: freebsd-current@freebsd.org Subject: getnetgrent(3) fails to parse long netgroup entry if it is stored = in NIS CAUTION: This email originated from outside of the University of Guelph. Do= not click links or open attachments unless you recognize the sender and kn= ow the content is safe. If in doubt, forward suspicious emails to IThelp@uo= guelph.ca Hello, I use netgroup stored in NIS database to control access to NFS server. Recently I added some hosts to netgroup that access to NFS server is permitted. And after that mountd(8) writes such messages as following to syslog. Mar 15 17:16:59 server mountd[4276]: can't get address info for host host34= .nfs. Mar 15 17:16:59 server mountd[4276]: bad host host34.nfs. in netgroup permi= tted_nfs_clients, skipping The netgroup entry used to control access to NFS server includes a lot of host such as following ---------------------------------------------------------------------- yasu@server[1002]% ypmatch -k permitted_nfs_clients netgroup permitted_nfs_clients: (host01.nfs.example.com,,) (ho= st02.nfs.example.com,,) (host03.nfs.example.com,,) = (host04.nfs.example.com,,) (host05.nf= s.example.com,,) (host06.nfs.example.com,,) = (host07.nfs.example.com,,) (host08.nfs.example= .com,,) (host09.nfs.example.com,,) = (host10.nfs.example.com,,) (host11.nfs.example.com,,= ) (host12.nfs.example.com,,) (host1= 3.nfs.example.com,,) (host14.nfs.example.com,,) = (host15.nfs.example.com,,) (host16.nfs.= example.com,,) (host17.nfs.example.com,,) = (host18.nfs.example.com,,) (host19.nfs.example= .com,,) (host20.nfs.example.com,,) = (host21.nfs.example.com,,) (host22.nfs.example.com,,)= (host23.nfs.example.com,,) (host2= 4.nfs.example.com,,) (host25.nfs.example.com,,) = (host26.nfs.example.com,,) (host27.nfs.e= xample.com,,) (host28.nfs.example.com,,) = (host29.nfs.example.com,,) (host30.nfs.example.= com,,) (host31.nfs.example.com,,) = (host32.nfs.example.com,,) (host33.nfs.example.com,,) = (host34.nfs.example.com,,) (host35= .nfs.example.com,,) (host36.nfs.example.com,,) = (host37.nfs.example.com,,) (host38.nfs.exam= ple.com,,) (host39.nfs.example.com,,) = (host40.nfs.example.com,,) (host41.nfs.example.co= m,,) (host42.nfs.example.com,,) (ho= st43.nfs.example.com,,) (host44.nfs.example.com,,) = (host45.nfs.example.com,,) (host46.n= fs.example.com,,) (host47.nfs.example.com,,) = (host48.nfs.example.com,,) (host49.nfs.exam= ple.com,,) (host50.nfs.example.com,,) yasu@server[1054]% ---------------------------------------------------------------------- And if I remove host34.nfs.example.com from permitted_nfs_clients, then syslog messages of mountd(1) changes as following. Mar 15 17:16:59 server mountd[4276]: can't get address info for host host35= .nfs. Mar 15 17:16:59 server mountd[4276]: bad host host35.nfs. in netgroup permi= tted_nfs_clients, skipping It seems to stop parsing the value of the netgroup entry in its middle if the length is longer than a certain value. I checked usr.sbin/mountd/mountd.c and found it uses getnetgrent(3) to parse the value of netgroup entry. So I wrote following program to check its behavior. ---------------------------------------------------------------------- yasu@server[1152]% cat list_netgroup_entry.c #include #include #include int main(int argc, char **argv) { if (argc !=3D 2) { fprintf(stderr, "Usage: %s NameOfNetgroup\n", basename(argv[0])); return 1; } setnetgrent(argv[1]); printf("netgroup: %s\n", argv[1]); char *host, *user, *domain; while (getnetgrent(&host, &user, &domain)) printf("\thost: %s, user: %s, domain: %s\n", host, user, domain); endnetgrent(); return 0; } yasu@server[1152]% ---------------------------------------------------------------------- If netgroup entry is stored in /etc/netgroup, then the value is parsed properly. ---------------------------------------------------------------------- yasu@server[1061]% cat /etc/netgroup very_long_file_entry (host1.long.long.long.example.com,,) \ (host2.long.long.long.example.com,,) \ (host3.long.long.long.example.com,,) \ (host4.long.long.long.example.com,,) \ (host5.long.long.long.example.com,,) \ (host6.long.long.long.example.com,,) \ (host7.long.long.long.example.com,,) \ (host8.long.long.long.example.com,,) \ (host9.long.long.long.example.com,,) \ (host10.long.long.long.example.com,,) \ (host11.long.long.long.example.com,,) \ (host12.long.long.long.example.com,,) \ (host13.long.long.long.example.com,,) \ (host14.long.long.long.example.com,,) \ (host15.long.long.long.example.com,,) \ (host16.long.long.long.example.com,,) \ (host17.long.long.long.example.com,,) \ (host18.long.long.long.example.com,,) \ (host19.long.long.long.example.com,,) \ (host20.long.long.long.example.com,,) \ (host21.long.long.long.example.com,,) \ (host22.long.long.long.example.com,,) \ (host23.long.long.long.example.com,,) \ (host24.long.long.long.example.com,,) \ (host25.long.long.long.example.com,,) \ (host26.long.long.long.example.com,,) \ (host27.long.long.long.example.com,,) \ (host28.long.long.long.example.com,,) \ (host29.long.long.long.example.com,,) \ (host30.long.long.long.example.com,,) + yasu@server[1062]% ./list_netgroup_entry very_long_file_entry netgroup: very_long_file_entry host: host30.long.long.long.example.com, user: , domain: host: host29.long.long.long.example.com, user: , domain: host: host28.long.long.long.example.com, user: , domain: host: host27.long.long.long.example.com, user: , domain: host: host26.long.long.long.example.com, user: , domain: host: host25.long.long.long.example.com, user: , domain: host: host24.long.long.long.example.com, user: , domain: host: host23.long.long.long.example.com, user: , domain: host: host22.long.long.long.example.com, user: , domain: host: host21.long.long.long.example.com, user: , domain: host: host20.long.long.long.example.com, user: , domain: host: host19.long.long.long.example.com, user: , domain: host: host18.long.long.long.example.com, user: , domain: host: host17.long.long.long.example.com, user: , domain: host: host16.long.long.long.example.com, user: , domain: host: host15.long.long.long.example.com, user: , domain: host: host14.long.long.long.example.com, user: , domain: host: host13.long.long.long.example.com, user: , domain: host: host12.long.long.long.example.com, user: , domain: host: host11.long.long.long.example.com, user: , domain: host: host10.long.long.long.example.com, user: , domain: host: host9.long.long.long.example.com, user: , domain: host: host8.long.long.long.example.com, user: , domain: host: host7.long.long.long.example.com, user: , domain: host: host6.long.long.long.example.com, user: , domain: host: host5.long.long.long.example.com, user: , domain: host: host4.long.long.long.example.com, user: , domain: host: host3.long.long.long.example.com, user: , domain: host: host2.long.long.long.example.com, user: , domain: host: host1.long.long.long.example.com, user: , domain: yasu@server[1063]% ---------------------------------------------------------------------- But if it is stored in NIS database, then parsing stops at the middle of it. ---------------------------------------------------------------------- yasu@server[1063]% ypmatch -k very_long_nis_entry netgroup very_long_nis_entry: (host1.long.long.long.example.com,,) = (host2.long.long.long.example.com,,) (host3.long.long.long.example.co= m,,) (host4.long.long.long.example.com,,) = (host5.long.long.long.example.com,,) (host6.long.lo= ng.long.example.com,,) (host7.long.long.long.example.com= ,,) (host8.long.long.long.example.com,,) = (host9.long.long.long.example.com,,) (host10.long.long= .long.example.com,,) (host11.long.long.long.example.com,,= ) (host12.long.long.long.example.com,,) = (host13.long.long.long.example.com,,) (host14.long.long.long.example.com,,)= (host15.long.long.long.example.com,,) = (host16.long.long.long.example.com,,) (host17.long.long.l= ong.example.com,,) (host18.long.long.long.example.com,,) = (host19.long.long.long.example.com,,) (h= ost20.long.long.long.example.com,,) (host21.long.long.long= .example.com,,) (host22.long.long.long.example.com,,) = (host23.long.long.long.example.com,,) (host= 24.long.long.long.example.com,,) (host25.long.long.long.example.com,,) = (host26.long.long.long.example.com,,) (hos= t27.long.long.long.example.com,,) (host28.long.long.long.e= xample.com,,) (host29.long.long.long.example.com,,) = (host30.long.long.long.example.com,,) yasu@server[1064]% ./list_netgroup_entry very_long_nis_entry netgroup: very_long_nis_entry host: host25.long.long.long.examp, user: , domain: host: host24.long.long.long.example.com, user: , domain: host: host23.long.long.long.example.com, user: , domain: host: host22.long.long.long.example.com, user: , domain: host: host21.long.long.long.example.com, user: , domain: host: host20.long.long.long.example.com, user: , domain: host: host19.long.long.long.example.com, user: , domain: host: host18.long.long.long.example.com, user: , domain: host: host17.long.long.long.example.com, user: , domain: host: host16.long.long.long.example.com, user: , domain: host: host15.long.long.long.example.com, user: , domain: host: host14.long.long.long.example.com, user: , domain: host: host13.long.long.long.example.com, user: , domain: host: host12.long.long.long.example.com, user: , domain: host: host11.long.long.long.example.com, user: , domain: host: host10.long.long.long.example.com, user: , domain: host: host9.long.long.long.example.com, user: , domain: host: host8.long.long.long.example.com, user: , domain: host: host7.long.long.long.example.com, user: , domain: host: host6.long.long.long.example.com, user: , domain: host: host5.long.long.long.example.com, user: , domain: host: host4.long.long.long.example.com, user: , domain: host: host3.long.long.long.example.com, user: , domain: host: host2.long.long.long.example.com, user: , domain: host: host1.long.long.long.example.com, user: , domain: yasu@server[1065]% ---------------------------------------------------------------------- So it seems getnetgrent(3) fails to parse long netgroup entry if it is stored in NIS. --- Yasuhiro Kimura