CVE-2021-44141: s3: torture: Add a test samba3.blackbox.test_symlink_…

…rename.SMB1.posix that shows we still leak target info across a SMB1+POSIX rename.

Add a knownfail.d/posix_sylink_rename

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14911

Signed-off-by: Jeremy Allison <[email protected]>

selftest/knownfail.d/posix_sylink_rename

@@ -0,0 +1 @@
+^samba3.blackbox.test_symlink_rename.SMB1.posix.symlink_rename_SMB1_posix\(fileserver_smb1_done\)

source3/script/tests/test_symlink_rename_smb1_posix.sh

@@ -0,0 +1,186 @@
+#!/bin/sh
+
+if [ $# -lt 7 ]; then
+cat <<EOF
+Usage: test_symlink_rename_smb1_posix.sh SERVER SERVER_IP USERNAME PASSWORD LOCAL_PATH PREFIX SMBCLIENT
+EOF
+exit 1;
+fi
+
+SERVER="${1}"
+SERVER_IP="${2}"
+USERNAME="${3}"
+PASSWORD="${4}"
+LOCAL_PATH="${5}"
+PREFIX="${6}"
+SMBCLIENT="${7}"
+SMBCLIENT="$VALGRIND ${SMBCLIENT}"
+shift 6
+
+incdir=$(dirname "$0")/../../../testprogs/blackbox
+. "$incdir"/subunit.sh
+
+failed=0
+
+# Do not let deprecated option warnings muck this up
+SAMBA_DEPRECATED_SUPPRESS=1
+export SAMBA_DEPRECATED_SUPPRESS
+
+
+# Define the test environment/filenames.
+#
+share_test_dir="$LOCAL_PATH"
+#
+# These files/directories will be created.
+#
+file_outside_share="/tmp/symlink_rename_test_file.$$"
+dir_outside_share="/tmp/symlink_rename_test_dir.$$"
+file_outside_share_noperms="/tmp/symlink_rename_test_file_noperm.$$"
+dir_outside_share_noperms="/tmp/symlink_rename_test_dir_noperm.$$"
+#
+# These two objects do not exist.
+#
+file_outside_share_noexist="/tmp/symlink_rename_test_noexist.$$"
+dir_outside_share_noexist="/tmp/symlink_rename_test_dir_noexist.$$"
+
+#
+# Cleanup function.
+#
+do_cleanup()
+{
+(
+#subshell.
+cd "$share_test_dir" || return
+rm -f "file_exists"
+rm -f "symlink_noexist"
+rm -f "symlink_file_outside_share"
+rm -f "symlink_file_outside_share_noexist"
+rm -f "symlink_dir_outside_share"
+rm -f "symlink_dir_outside_share_noexist"
+rm -f "symlink_file_outside_share_noperms"
+rm -f "symlink_dir_outside_share_noperms"
+# Links inside share.
+rm -f "symlink_file_inside_share_noperms"
+rm -f "file_inside_share_noperms"
+rm -f "symlink_dir_inside_share_noperms"
+chmod 755 "dir_inside_share_noperms"
+rm -rf "dir_inside_share_noperms"
+)
+rm -f "$file_outside_share"
+rm -rf "$dir_outside_share"
+rm -f "$file_outside_share_noperms"
+rm -rf "$dir_outside_share_noperms"
+}
+
+#
+# Ensure we start from a clean slate.
+#
+do_cleanup
+
+#
+# Create the test files/directories/symlinks.
+#
+# File/directory explicitly outside share.
+touch "$file_outside_share"
+mkdir "$dir_outside_share"
+# File/directory explicitly outside share with permission denied.
+touch "$file_outside_share_noperms"
+chmod 0 "$file_outside_share_noperms"
+mkdir "$dir_outside_share_noperms"
+chmod 0 "$dir_outside_share_noperms"
+#
+# Create links to these objects inside the share definition.
+(
+#subshell.
+cd "$share_test_dir" || return
+# Source file for all renames. None of these should succeed.
+touch "file_exists"
+ln -s "noexist" "symlink_noexist"
+ln -s "$file_outside_share" "symlink_file_outside_share"
+ln -s "$file_outside_share_noexist" "symlink_file_outside_share_noexist"
+ln -s "$dir_outside_share" "symlink_dir_outside_share"
+ln -s "$dir_outside_share_noexist" "symlink_dir_outside_share_noexist"
+ln -s "$file_outside_share_noperms" "symlink_file_outside_share_noperms"
+ln -s "$dir_outside_share_noperms" "symlink_dir_outside_share_noperms"
+#
+# Create symlinks to access denied file and directory
+# objects within the share
+touch "file_inside_share_noperms"
+chmod 0 "file_inside_share_noperms"
+ln -s "file_inside_share_noperms" "symlink_file_inside_share_noperms"
+mkdir "dir_inside_share_noperms"
+touch "dir_inside_share_noperms/noperm_file_exists"
+chmod 0 "dir_inside_share_noperms"
+ln -s "dir_inside_share_noperms" "symlink_dir_inside_share_noperms"
+)
+
+#
+# smbclient function given command, path, expected error, and posix.
+#
+smbclient_expect_error()
+{
+    filecmd="$1"
+    filename1="$2"
+    filename2="$3"
+    expected_error="$4"
+    tmpfile=$PREFIX/smbclient_interactive_prompt_commands
+    cat > "$tmpfile" <<EOF
+posix
+$filecmd $filename1 $filename2
+quit
+EOF
+    cmd='CLI_FORCE_INTERACTIVE=yes $SMBCLIENT -U$USERNAME%$PASSWORD //$SERVER/local_symlinks -I$SERVER_IP -mNT1 < $tmpfile 2>&1'
+    eval echo "$cmd"
+    out=$(eval "$cmd")
+    ret=$?
+    rm -f "$tmpfile"
+
+    if [ $ret != 0 ] ; then
+	printf "%s\n" "$out"
+	printf "failed accessing local_symlinks with error %s\n" "$ret"
+	return 1
+    fi
+
+    if [ "$expected_error" = "NT_STATUS_OK" ] ; then
+        printf "%s" "$out" | grep -v "NT_STATUS_"
+    else
+        printf "%s" "$out" | grep "$expected_error"
+    fi
+    ret=$?
+    if [ $ret != 0 ] ; then
+	printf "%s\n" "$out"
+	printf "failed - should get %s doing posix \"%s %s %s\"\n" "$expected_error" "$filecmd" "$filename1" "$filename2"
+	return 1
+    fi
+}
+
+#
+# SMB1+posix tests.
+#
+test_symlink_rename_SMB1_posix()
+{
+#
+# rename commands.
+# As all the targets exist as symlinks, these should all fail.
+#
+    smbclient_expect_error "rename" "file_exists" "symlink_noexist" "NT_STATUS_OBJECT_NAME_COLLISION" || return 1
+    smbclient_expect_error "rename" "file_exists" "symlink_file_outside_share" "NT_STATUS_OBJECT_NAME_COLLISION" || return 1
+    smbclient_expect_error "rename" "file_exists" "symlink_file_outside_share_noexist" "NT_STATUS_OBJECT_NAME_COLLISION" || return 1
+    smbclient_expect_error "rename" "file_exists" "symlink_dir_outside_share" "NT_STATUS_OBJECT_NAME_COLLISION" || return 1
+    smbclient_expect_error "rename" "file_exists" "symlink_dir_outside_share_noexist" "NT_STATUS_OBJECT_NAME_COLLISION" || return 1
+    smbclient_expect_error "rename" "file_exists" "symlink_file_outside_share_noperms" "NT_STATUS_OBJECT_NAME_COLLISION" || return 1
+    smbclient_expect_error "rename" "file_exists" "symlink_dir_outside_share_noperms" "NT_STATUS_OBJECT_NAME_COLLISION" || return 1
+    smbclient_expect_error "rename" "file_exists" "symlink_file_inside_share_noperms" "NT_STATUS_OBJECT_NAME_COLLISION" || return 1
+    smbclient_expect_error "rename" "file_exists" "symlink_dir_inside_share_noperms" "NT_STATUS_OBJECT_NAME_COLLISION" || return 1
+    return 0
+}
+
+testit "symlink_rename_SMB1_posix" \
+	test_symlink_rename_SMB1_posix || \
+	failed=$((failed+1))
+
+#
+# Cleanup.
+do_cleanup
+
+testok "$0" "$failed"

source3/selftest/tests.py

@@ -594,6 +594,11 @@ def is_module_enabled(module):
                   '$SERVER', '$SERVER_IP', '$USERNAME', '$PASSWORD', '$LOCAL_PATH/local_symlinks',
                   '$PREFIX', smbclient3])
 
+    plantestsuite("samba3.blackbox.test_symlink_rename.SMB1.posix", env + "_smb1_done",
+                  [os.path.join(samba3srcdir, "script/tests/test_symlink_rename_smb1_posix.sh"),
+                  '$SERVER', '$SERVER_IP', '$USERNAME', '$PASSWORD', '$LOCAL_PATH/local_symlinks',
+                  '$PREFIX', smbclient3])
+
     #
     # tar command tests
     #