fuse: add "resolve-gids" mount option to overcome 32-groups limit

Add a --resolve-gids commandline option to the glusterfs binary. This
option gets set when executing "mount -t glusterfs -o resolve-gids ...".

This option is most useful in combination with the "acl" mount option.
POSIX ACL permission checking is done on the FUSE-client side to improve
performance (in addition to the checking on the bricks).

The fuse-bridge reads /proc/$PID/status by default, and this file
contains maximum 32 groups. Any local (client-side) permission checking
that requires more than the first 32 groups will fail.

By enabling the "resolve-gids" option, the fuse-bridge will call
getgrouplist() to retrieve all the groups from the user accessing the
mountpoint. This is comparable to how "nfs.server-aux-gids" works.

Note that when a user belongs to more than ~93 groups, the volume option
server.manage-gids needs to be enabled too. Without this option, the
RPC-layer will need to reduce the number of groups to make them fit in
the RPC-header.

Cherry picked from commit 64a5bf3749c67fcc00773a2716d0c7b61b0b4417:
> Change-Id: I7ede90d0e41bcf55755cced5747fa0fb1699edb2
> BUG: 1246275
> Signed-off-by: Niels de Vos <ndevos@redhat.com>
> Reviewed-on: http://review.gluster.org/11732
> Tested-by: NetBSD Build System <jenkins@build.gluster.org>
> Reviewed-by: Ravishankar N <ravishankar@redhat.com>
> Tested-by: Gluster Build System <jenkins@build.gluster.com>
> Reviewed-by: jiffin tony Thottan <jthottan@redhat.com>
> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>

Change-Id: I7ede90d0e41bcf55755cced5747fa0fb1699edb2
BUG: 1246397
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/11875
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

1 files changed, 113 insertions, 0 deletions

diff --git a/tests/bugs/fuse/many-groups-for-acl.t b/tests/bugs/fuse/many-groups-for-acl.t
new file mode 100755
index 00000000000..d83fe12644a
--- /dev/null
+++ b/tests/bugs/fuse/many-groups-for-acl.t
@@ -0,0 +1,113 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+. $(dirname $0)/../../nfs.rc
+
+cleanup
+
+# prepare the users and groups
+NEW_USER=bug1246275
+NEW_UID=1246275
+NEW_GID=1246275
+LAST_GID=1246403
+NEW_GIDS=${NEW_GID}
+
+# OS-specific overrides
+case $OSTYPE in
+NetBSD|Darwin)
+        # no ACLs, and only NGROUPS_MAX=16 secondary groups are supported
+        SKIP_TESTS
+        exit 0
+        ;;
+FreeBSD)
+        # NGROUPS_MAX=1023 (FreeBSD>=8.0), we can afford 200 groups
+        ;;
+Linux)
+        # NGROUPS_MAX=65536, we can afford 200 groups
+        ;;
+*)
+        ;;
+esac
+
+# create a user that belongs to many groups
+for GID in $(seq  -f '%6.0f' ${NEW_GID} ${LAST_GID})
+do
+        groupadd -o -g ${GID} ${NEW_USER}-${GID}
+        NEW_GIDS="${NEW_GIDS},${NEW_USER}-${GID}"
+done
+TEST useradd -o -M -u ${NEW_UID} -g ${NEW_GID} -G ${NEW_USER}-${NEW_GIDS} ${NEW_USER}
+
+# preparation done, start the tests
+
+TEST glusterd
+TEST pidof glusterd
+TEST $CLI volume create ${V0} ${H0}:${B0}/${V0}1
+# disable manage-gids on the server-side for now, gets enabled later
+TEST $CLI volume set ${V0} server.manage-gids off
+TEST $CLI volume start ${V0}
+
+EXPECT_WITHIN ${NFS_EXPORT_TIMEOUT} "1" is_nfs_export_available
+
+# mount the volume with POSIX ACL support, without --resolve-gids
+TEST glusterfs --acl --volfile-id=/${V0} --volfile-server=${H0} ${M0}
+
+# create some directories for testing
+TEST mkdir ${M0}/first-32-gids-1
+TEST setfacl -m g:${NEW_UID}:rwx ${M0}/first-32-gids-1
+TEST mkdir ${M0}/first-32-gids-2
+TEST setfacl -m g:$[NEW_UID+16]:rwx ${M0}/first-32-gids-2
+TEST mkdir ${M0}/gid-64
+TEST setfacl -m g:$[NEW_UID+64]:rwx ${M0}/gid-64
+TEST mkdir ${M0}/gid-120
+TEST setfacl -m g:$[NEW_UID+120]:rwx ${M0}/gid-120
+
+su -m ${NEW_USER} -c "touch ${M0}/first-32-gids-1/success > /dev/null"
+TEST [ $? -eq 0 ]
+
+su -m ${NEW_USER} -c "touch ${M0}/first-32-gids-2/success > /dev/null"
+TEST [ $? -eq 0 ]
+
+su -m ${NEW_USER} -c "touch ${M0}/gid-64/failure > /dev/null"
+TEST [ $? -ne 0 ]
+
+su -m ${NEW_USER} -c "touch ${M0}/gid-120/failure > /dev/null"
+TEST [ $? -ne 0 ]
+
+# unmount and remount with --resolve-gids
+EXPECT_WITHIN ${UMOUNT_TIMEOUT} "Y" force_umount ${M0}
+TEST glusterfs --acl --resolve-gids --volfile-id=/${V0} --volfile-server=${H0} ${M0}
+
+su -m ${NEW_USER} -c "touch ${M0}/gid-64/success > /dev/null"
+TEST [ $? -eq 0 ]
+
+su -m ${NEW_USER} -c "touch ${M0}/gid-120/failure > /dev/null"
+TEST [ $? -ne 0 ]
+
+# enable server-side resolving of the groups
+# stopping and starting is not really needed, but it prevents races
+TEST $CLI volume stop ${V0}
+TEST $CLI volume set ${V0} server.manage-gids on
+TEST $CLI volume start ${V0}
+EXPECT_WITHIN ${NFS_EXPORT_TIMEOUT} "1" is_nfs_export_available
+
+# unmount and remount to prevent more race conditions on test systems
+EXPECT_WITHIN ${UMOUNT_TIMEOUT} "Y" force_umount ${M0}
+TEST glusterfs --acl --resolve-gids --volfile-id=/${V0} --volfile-server=${H0} ${M0}
+
+su -m ${NEW_USER} -c "touch ${M0}/gid-120/success > /dev/null"
+TEST [ $? -eq 0 ]
+
+# cleanup
+userdel --force ${NEW_USER}
+for GID in $(seq  -f '%6.0f' ${NEW_GID} ${LAST_GID})
+do
+        groupdel ${NEW_USER}-${GID}
+done
+
+EXPECT_WITHIN ${UMOUNT_TIMEOUT} "Y" force_umount ${M0}
+
+TEST ${CLI} volume stop ${V0}
+TEST ${CLI} volume delete ${V0}
+
+cleanup