/etc/ppp/options.pptp is in pptp-linux 1.9.0+ds-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# $Id: options.pptp,v 1.4 2012/08/30 21:34:13 quozl Exp $
#
# Sample PPTP PPP options file /etc/ppp/options.pptp
# Options used by PPP when a connection is made by a PPTP client.
# This file can be referred to by an /etc/ppp/peers file for the tunnel.
# Changes are effective on the next connection. See "man pppd".
#
# You are expected to change this file to suit your system. As
# packaged, it requires PPP 2.4.2 or later from http://ppp.samba.org/
# and the kernel MPPE module available from the CVS repository also on
# http://ppp.samba.org/, which is packaged for DKMS as kernel_ppp_mppe.
###############################################################################
# Lock the port
lock
# Authentication
# We don't need the tunnel server to authenticate itself
noauth
# We won't do PAP, EAP, CHAP, or MSCHAP, but we will accept MSCHAP-V2
# (you may need to remove these refusals if the server is not using MPPE)
refuse-pap
refuse-eap
refuse-chap
refuse-mschap
# Compression
# Turn off compression protocols we know won't be used
nobsdcomp
nodeflate
# Encryption
# (There have been multiple versions of PPP with encryption support,
# choose which of the following sections you will use. Note that MPPE
# requires the use of MSCHAP-V2 during authentication)
#
# Note that using PPTP with MPPE and MSCHAP-V2 should be considered
# insecure:
# http://marc.info/?l=pptpclient-devel&m=134372640219039&w=2
# https://github.com/moxie0/chapcrack/blob/master/README.md
# http://technet.microsoft.com/en-us/security/advisory/2743314
# http://ppp.samba.org/ the PPP project version of PPP by Paul Mackarras
# ppp-2.4.2 or later with MPPE only, kernel module ppp_mppe.o
# If the kernel is booted in FIPS mode (fips=1), the ppp_mppe.ko module
# is not allowed and PPTP-MPPE is not available.
# {{{
# Require MPPE 128-bit encryption
#require-mppe-128
# }}}
# http://mppe-mppc.alphacron.de/ fork from PPP project by Jan Dubiec
# ppp-2.4.2 or later with MPPE and MPPC, kernel module ppp_mppe_mppc.o
# {{{
# Require MPPE 128-bit encryption
#mppe required,stateless
# }}}
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