s3: selftest: Add regression test to show the $cwd cache is misbehaving when we connect as a different user on a share.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14682

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>

selftest/knownfail.d/chdir-cache

@@ -0,0 +1 @@
+^samba3.blackbox.chdir-cache.*

source3/script/tests/test_chdir_cache.sh

@@ -0,0 +1,102 @@
+#!/bin/bash
+#
+# Ensure we get a chdir_current_service error if CHDIR fails with EACCESS
+# for an SMB2 request.
+#
+# BUG:https://bugzilla.samba.org/show_bug.cgi?id=14682
+#
+# Copyright (C) 2021 Jeremy Allison
+
+if [ $# -lt 5 ]; then
+    echo Usage: test_chdir_user.sh \
+	 --configfile=SERVERCONFFILE SMBCLIENT SMBCONTROL SERVER SHARE
+exit 1
+fi
+
+CONF=$1; shift 1
+SMBCLIENT=$1; shift 1
+SMBCONTROL=$1; shift 1
+SERVER=$1; shift 1
+SHARE=$1; shift 1
+
+# Do not let deprecated option warnings muck this up
+SAMBA_DEPRECATED_SUPPRESS=1
+export SAMBA_DEPRECATED_SUPPRESS
+
+conf_dir=$(dirname ${SERVERCONFFILE})
+
+log_file=${conf_dir}/../smbd_test.log
+
+error_inject_conf=${conf_dir}/error_inject.conf
+> ${error_inject_conf}
+
+incdir=$(dirname $0)/../../../testprogs/blackbox
+. $incdir/subunit.sh
+
+failed=0
+
+cd $SELFTEST_TMPDIR || exit 1
+
+rm -f smbclient-stdin smbclient-stdout smbclient-stderr
+mkfifo smbclient-stdin smbclient-stdout smbclient-stderr
+
+CLI_FORCE_INTERACTIVE=1; export CLI_FORCE_INTERACTIVE
+
+${SMBCLIENT} //${SERVER}/${SHARE} ${CONF} -U${USER}%${PASSWORD} \
+	     < smbclient-stdin > smbclient-stdout 2>smbclient-stderr &
+CLIENT_PID=$!
+
+# Count the number of chdir_current_service: vfs_ChDir.*failed: Permission denied
+# errors that are already in the log (should be zero).
+num_errs=`grep "chdir_current_service: vfs_ChDir.*failed: Permission denied" ${log_file} | wc -l`
+
+sleep 1
+
+exec 100>smbclient-stdin 101<smbclient-stdout 102<smbclient-stderr
+
+# consume the smbclient startup messages
+head -n 1 <&101
+
+# Do an 'ls' as ${USER} to make sure we've done a CHDIR into
+# the share directory.
+echo "ls" >&100
+
+# consume the smbclient output
+head -n 4 <&101
+
+# Now change user to user2, and connect to the share.
+# This should leave us in the same share directory.
+echo "logon user2 ${PASSWORD}" >&100
+echo "tcon ${SHARE}" >&100
+
+# consume the smbclient output
+head -n 4 <&101
+
+# Ensure any chdir will give EACCESS.
+echo "error_inject:chdir = EACCES" > ${error_inject_conf}
+${SMBCONTROL} ${CONF} 0 reload-config
+
+sleep 1
+
+# Do an 'ls' as user2. Changing users should have
+# deleted the CHDIR cache, so we should now see
+# a chdir_current_service: vfs_ChDir.*failed: Permission denied
+# error message in the log.
+echo 'ls' >&100
+
+kill ${CLIENT_PID}
+rm -f smbclient-stdin smbclient-stdout smbclient-stderr
+
+# Remove the chdir inject.
+> ${error_inject_conf}
+${SMBCONTROL} ${CONF} 0 reload-config
+
+# Now look for chdir_current_service: vfs_ChDir.*failed: Permission denied
+# in the smb log. There should be one more than before.
+
+num_errs1=`grep "chdir_current_service: vfs_ChDir.*failed: Permission denied" ${log_file} | wc -l`
+
+testit "Verify we got at least one chdir error" \
+       test $num_errs1 -gt $num_errs || failed=$(expr $failed + 1)
+
+testok $0 $failed

source3/selftest/tests.py

@@ -1078,6 +1078,15 @@ plantestsuite("samba3.blackbox.open-eintr", "simpleserver:local",
                '$SERVER_IP',
                "error_inject"])
 
+plantestsuite("samba3.blackbox.chdir-cache", "simpleserver:local",
+              [os.path.join(samba3srcdir,
+                            "script/tests/test_chdir_cache.sh"),
+               configuration,
+               os.path.join(bindir(), "smbclient"),
+               os.path.join(bindir(), "smbcontrol"),
+               '$SERVER_IP',
+               "error_inject"])
+
 plantestsuite("samba3.blackbox.netfileenum", "simpleserver:local",
               [os.path.join(samba3srcdir,
                             "script/tests/test_netfileenum.sh"),