Date: Fri, 19 Feb 2010 11:11:02 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: freebsd-stable@freebsd.org Subject: RELENG_8 -- NFSv3 credentials/permissions issue Message-ID: <20100219191102.GA1045@icarus.home.lan>
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I'm willing to bet this is something simple I've overlooked, but I'm out of ideas. Client is 8.0-RELEASE i386, server is 8.0-STABLE amd64 (kernel/world 2010/01/16). NFS version used is v3. Server filesystem is UFS2. Client configuration is off-kilter: it's a PXE booted machine. Initial PXE booting uses TFTP, then switches to NFS to load the kernel and kernel modules. The TFTP part works, with a caveat[1], but the NFS portion fails. With NFS, I'm forced to change permissions on all the exported files/directories to be 0644/0755 (specifically, setting other/global read/write access) otherwise the client gets back "Permission denied". The nfsd(8) man page implies that this shouldn't be necessary; adding -mapall=nobody:nobody or -maproot=nobody doesn't fix things either. In the absence of -maproot and -mapall options, remote accesses by root will result in using a credential of -2:-2. All other users will be mapped to their remote credential. If a -maproot option is given, remote access by root will be mapped to that credential instead of -2:-2. If a -mapall option is given, all users (including root) will be mapped to that credential in place of their own. Configuration data, tcpdump validation (client=192.168.1.140, server=192.168.1.51), and syslog data is below. Ideas? [1]: TFTP works as long as the file its trying to request (in this case /usr/local/freebsd8/boot/pxeboot) has its other/global read bit set, otherwise EACCESS is returned; I had to look in the tftpd source to figure this out. I'm not sure what the justification is there, given that use of -s and/or -u switches credentials to user/group nobody... -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | Relevant server configuration bits: /etc/rc.conf ============== rpcbind_enable="yes" rpcbind_flags="-l" mountd_enable="yes" mountd_flags="-r -l" nfs_server_enable="yes" /etc/exports ============== /usr/local/freebsd8 -network 192.168.1 -mask 255.255.255.0 Permissions ============= drwxr-xr-x 22 root wheel 512 Feb 6 12:25 / drwxr-xr-x 17 root wheel 512 Feb 12 03:38 /usr drwxr-xr-x 15 root wheel 512 Feb 19 10:41 /usr/local drwx------ 5 nobody nobody 512 Feb 19 10:42 /usr/local/freebsd8 drwx------ 7 nobody nobody 1024 Nov 21 08:11 /usr/local/freebsd8/boot drwx------ 2 nobody nobody 12800 Nov 21 08:11 /usr/local/freebsd8/boot/kernel -r-------- 1 nobody nobody 11492703 Nov 21 07:48 /usr/local/freebsd8/boot/kernel/kernel tcpdump ========= {...snipping TFTP portion...} 10:57:20.601313 IP 192.168.1.140.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:30:48:71:60:6b, length 548 10:57:20.601442 IP 192.168.1.51.67 > 192.168.1.140.68: BOOTP/DHCP, Reply, length 323 10:57:20.601688 IP 192.168.1.140.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:30:48:71:60:6b, length 548 10:57:20.601782 IP 192.168.1.51.67 > 192.168.1.140.68: BOOTP/DHCP, Reply, length 323 10:57:20.613056 IP 192.168.1.140.1023 > 192.168.1.51.111: UDP, length 76 10:57:20.613369 IP 192.168.1.51.111 > 192.168.1.140.1023: UDP, length 28 10:57:20.613556 IP 192.168.1.140.1023 > 192.168.1.51.947: UDP, length 84 10:57:20.613921 IP 192.168.1.51.947 > 192.168.1.140.1023: UDP, length 60 10:57:20.614055 IP 192.168.1.140.1023 > 192.168.1.51.111: UDP, length 76 10:57:20.614291 IP 192.168.1.51.111 > 192.168.1.140.1023: UDP, length 28 10:57:20.614432 IP 192.168.1.140.4 > 192.168.1.51.2049: 100 lookup fh 1197,150310/6618112 "boot" 10:57:20.614458 IP 192.168.1.51.2049 > 192.168.1.140.4: reply ok 28 lookup ERROR: Permission denied 10:57:20.615436 IP 192.168.1.140.1022 > 192.168.1.51.947: UDP, length 84 10:57:20.615677 IP 192.168.1.51.947 > 192.168.1.140.1022: UDP, length 60 10:57:20.615806 IP 192.168.1.140.6 > 192.168.1.51.2049: 100 lookup fh 1197,150310/6618112 "boot" 10:57:20.615824 IP 192.168.1.51.2049 > 192.168.1.140.6: reply ok 28 lookup ERROR: Permission denied 10:57:20.615929 IP 192.168.1.140.1021 > 192.168.1.51.947: UDP, length 84 10:57:20.616164 IP 192.168.1.51.947 > 192.168.1.140.1021: UDP, length 60 10:57:20.616308 IP 192.168.1.140.8 > 192.168.1.51.2049: 100 lookup fh 1197,150310/6618112 "boot" 10:57:20.616327 IP 192.168.1.51.2049 > 192.168.1.140.8: reply ok 28 lookup ERROR: Permission denied 10:57:20.616428 IP 192.168.1.140.1020 > 192.168.1.51.947: UDP, length 84 10:57:20.616660 IP 192.168.1.51.947 > 192.168.1.140.1020: UDP, length 60 {...repeat until client gives up...} Feb 19 10:57:20 icarus dhcpd: DHCPDISCOVER from 00:30:48:71:60:6b via em0 Feb 19 10:57:20 icarus dhcpd: DHCPOFFER on 192.168.1.140 to 00:30:48:71:60:6b via em0 Feb 19 10:57:20 icarus dhcpd: DHCPREQUEST for 192.168.1.140 (192.168.1.51) from 00:30:48:71:60:6b via em0 Feb 19 10:57:20 icarus dhcpd: DHCPACK on 192.168.1.140 to 00:30:48:71:60:6b via em0 Feb 19 10:57:20 icarus rpcbind: connect from 192.168.1.140 to getport/addr(mountd) Feb 19 10:57:20 icarus mountd[1474]: mount request succeeded from 192.168.1.140 for /usr/local/freebsd8 Feb 19 10:57:20 icarus rpcbind: connect from 192.168.1.140 to getport/addr(nfs) Feb 19 10:57:20 icarus mountd[1474]: mount request succeeded from 192.168.1.140 for /usr/local/freebsd8 Feb 19 10:57:21 icarus last message repeated 34 times
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