net-dialup/ppp: backport MPPE sstpc fix

Big thanks to Eivind for reaching out and pointing out we need
this with the sstpc bump that's also being pushed (sstpc-client
and networkmanager-sstpc).

Thanks-to: Eivind Næss <eivnaes@yahoo.com>
Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 279 insertions, 0 deletions

diff --git a/net-dialup/ppp/files/ppp-2.4.9-fix-MPPE-sstpc.patch b/net-dialup/ppp/files/ppp-2.4.9-fix-MPPE-sstpc.patch
new file mode 100644
index 000000000000..15a1298ce303
--- /dev/null
+++ b/net-dialup/ppp/files/ppp-2.4.9-fix-MPPE-sstpc.patch
@@ -0,0 +1,25 @@
+https://github.com/ppp-project/ppp/commit/d7e62a8499c4032d79e05afbd8fd3efd51c5b148
+https://bugs.launchpad.net/ubuntu/+source/ppp/+bug/1958196
+
+From: =?UTF-8?q?Eivind=20N=C3=A6ss?= <eivnaes@yahoo.com>
+Date: Thu, 3 Feb 2022 14:28:22 -0800
+Subject: [PATCH] pppd/eap: Fix bug causing incorrect response length (#334)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Need to update the esp->ea_client.ea_namelen variable. A plugin can override the
+name of the user, and the variable is passed onto the eap_chap2_response generating
+the wrong response length.
+
+Signed-off-by: Eivind Næss <eivnaes@yahoo.com>
+--- a/pppd/eap.c
++++ b/pppd/eap.c
+@@ -2182,6 +2182,7 @@ eap_request(eap_state *esp, u_char *inp, int id, int len)
+ 		    eap_send_nak(esp, id, EAPT_SRP);
+ 		    break;
+ 		}
++		esp->es_client.ea_namelen = strlen(esp->es_client.ea_name);
+ 
+ 		/* Create the MSCHAPv2 response (and add to cache) */
+ 		unsigned char response[MS_CHAP2_RESPONSE_LEN+1]; // VLEN + VALUE
diff --git a/net-dialup/ppp/ppp-2.4.9-r7.ebuild b/net-dialup/ppp/ppp-2.4.9-r7.ebuild
new file mode 100644
index 000000000000..560d483d8dc4
--- /dev/null
+++ b/net-dialup/ppp/ppp-2.4.9-r7.ebuild
@@ -0,0 +1,254 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit linux-info pam toolchain-funcs
+
+PATCH_TARBALL_NAME="${PN}-2.4.9-patches-03"
+DESCRIPTION="Point-to-Point Protocol (PPP)"
+HOMEPAGE="https://ppp.samba.org/"
+SRC_URI="https://github.com/paulusmack/ppp/archive/${P}.tar.gz
+	https://dev.gentoo.org/~polynomial-c/${PATCH_TARBALL_NAME}.tar.xz
+	http://www.netservers.net.uk/gpl/ppp-dhcpc.tgz"
+
+LICENSE="BSD GPL-2"
+SLOT="0/${PV}"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
+IUSE="activefilter atm dhcp +eap-tls gtk ipv6 pam radius systemd"
+
+DEPEND="
+	dev-libs/openssl:0=
+	virtual/libcrypt:=
+	activefilter? ( net-libs/libpcap )
+	atm? ( net-dialup/linux-atm )
+	gtk? ( x11-libs/gtk+:2 )
+	pam? ( sys-libs/pam )
+	systemd? ( sys-apps/systemd )
+"
+RDEPEND="${DEPEND}
+	!<net-misc/netifrc-0.7.1-r2"
+BDEPEND="virtual/pkgconfig"
+PDEPEND="net-dialup/ppp-scripts"
+
+S="${WORKDIR}/${PN}-${P}"
+
+src_prepare() {
+	mv "${WORKDIR}/dhcp" "${S}/pppd/plugins" || die
+
+	eapply "${WORKDIR}"/patches
+	eapply "${FILESDIR}"/${P}-fix-MPPE-sstpc.patch
+
+	#IPX Support is removed in kernel >= 5.15
+	sed -i 's/-DIPX_CHANGE //' pppd/Makefile.linux || die
+
+	if use atm ; then
+		einfo "Enabling PPPoATM support"
+		sed -i '/^#HAVE_LIBATM=yes/s:#::' \
+			pppd/plugins/pppoatm/Makefile.linux || die
+	fi
+
+	if ! use activefilter ; then
+		einfo "Disabling active filter"
+		sed -i '/^FILTER=y/s:^:#:' pppd/Makefile.linux || die
+	fi
+
+	if use pam ; then
+		einfo "Enabling PAM"
+		sed -i '/^#USE_PAM=y/s:^#::' pppd/Makefile.linux || die
+	fi
+
+	if ! use ipv6 ; then
+		einfo "Disabling IPv6"
+		sed -i '/^HAVE_INET6/s:^:#:' pppd/Makefile.linux || die
+	else
+		echo "+ipv6" >> etc.ppp/options || die
+	fi
+
+	einfo "Enabling CBCP"
+	sed -i '/^#CBCP=y/s:#::' pppd/Makefile.linux || die
+
+	if use dhcp ; then
+		einfo "Adding ppp-dhcp plugin files"
+		sed \
+			-e '/^SUBDIRS :=/s:$: dhcp:' \
+			-i pppd/plugins/Makefile.linux || die
+	fi
+
+	if ! use eap-tls ; then
+		einfo "Disabling EAP-TLS pppd auth support"
+		sed -i '/^USE_EAPTLS=y/s:^:#:' pppd/Makefile.linux || die
+		einfo "Disabling EAP-TLS plugin support"
+		sed -i '/^CFLAGS += -DUSE_EAPTLS=1/s:^:#:' \
+			pppd/plugins/Makefile.linux || die
+	fi
+
+	# Set correct libdir
+	sed -i -e "s:/lib/pppd:/$(get_libdir)/pppd:" \
+		pppd/{pathnames.h,pppd.8} || die
+
+	if use radius ; then
+		# Set the right paths in radiusclient.conf
+		sed -e "s:/usr/local/etc:/etc:" \
+			-e "s:/usr/local/sbin:/usr/sbin:" \
+			-i pppd/plugins/radius/etc/radiusclient.conf || die
+		# Set config dir to /etc/ppp/radius
+		sed -i -e "s:/etc/radiusclient:/etc/ppp/radius:g" \
+			pppd/plugins/radius/{*.8,*.c,*.h} \
+			pppd/plugins/radius/etc/* || die
+	else
+		einfo "Disabling radius"
+		sed -i -e '/+= radius/s:^:#:' pppd/plugins/Makefile.linux || die
+	fi
+
+	if use systemd ; then
+		einfo "Enabling systemd notification"
+		sed '/SYSTEMD=/s@^#@@' -i pppd/Makefile.linux || die
+	fi
+
+	# Respect our pkg-config settings.
+	sed -i \
+		-e 's:pkg-config:$(PKG_CONFIG):' \
+		contrib/pppgetpass/Makefile.linux || die
+	sed -i \
+		-e '/^LIBS/{s:-L/usr/local/ssl/lib::;s:-lcrypto:`$(PKG_CONFIG) --libs libcrypto`:}' \
+		pppd/Makefile.linux || die
+
+	eapply_user #549588
+}
+
+src_compile() {
+	tc-export AR CC PKG_CONFIG
+	emake CC="${CC}" COPTS="${CFLAGS} -D_GNU_SOURCE"
+
+	# build pppgetpass
+	cd contrib/pppgetpass || die
+	if use gtk ; then
+		emake -f Makefile.linux
+	else
+		emake pppgetpass.vt
+	fi
+}
+
+src_install() {
+	local i
+	for i in chat pppd pppdump pppstats ; do
+		doman ${i}/${i}.8
+		dosbin ${i}/${i}
+	done
+	fperms u+s-w /usr/sbin/pppd
+
+	# Install pppd header files
+	emake -C pppd INSTROOT="${D}" install-devel
+
+	dosbin pppd/plugins/pppoe/pppoe-discovery
+
+	dodir /etc/ppp/peers
+	insinto /etc/ppp
+	insopts -m0600
+	newins etc.ppp/pap-secrets pap-secrets.example
+	newins etc.ppp/chap-secrets chap-secrets.example
+
+	insopts -m0644
+	doins etc.ppp/options
+
+	if use pam; then
+		pamd_mimic_system ppp auth account session
+	fi
+
+	local PLUGINS_DIR="/usr/$(get_libdir)/pppd/${PV}"
+	insinto "${PLUGINS_DIR}"
+	insopts -m0755
+	doins pppd/plugins/minconn.so
+	doins pppd/plugins/passprompt.so
+	doins pppd/plugins/passwordfd.so
+	doins pppd/plugins/winbind.so
+	doins pppd/plugins/pppoe/pppoe.so
+	doins pppd/plugins/pppol2tp/openl2tp.so
+	doins pppd/plugins/pppol2tp/pppol2tp.so
+	if use atm ; then
+		doins pppd/plugins/pppoatm/pppoatm.so
+	fi
+	if use dhcp ; then
+		doins pppd/plugins/dhcp/dhcpc.so
+	fi
+	if use radius ; then
+		doins pppd/plugins/radius/rad{ius,attr,realms}.so
+
+		#Copy radiusclient configuration files (#92878)
+		insinto /etc/ppp/radius
+		insopts -m0644
+		doins pppd/plugins/radius/etc/{dictionary*,issue,port-id-map,radiusclient.conf,realms,servers}
+
+		doman pppd/plugins/radius/pppd-rad{ius,attr}.8
+	fi
+
+	insinto /etc/modprobe.d
+	insopts -m0644
+	newins "${FILESDIR}/modules.ppp" ppp.conf
+
+	dodoc PLUGINS README* SETUP Changes-2.3 FAQ
+	dodoc "${FILESDIR}/README.mpls"
+
+	dosbin scripts/p{on,off,log}
+	doman scripts/pon.1
+
+	# Adding misc. specialized scripts to doc dir
+	dodoc -r scripts
+	docinto scripts
+	dodoc -r scripts/chatchat
+
+	if use gtk ; then
+		dosbin contrib/pppgetpass/{pppgetpass.vt,pppgetpass.gtk}
+		newsbin contrib/pppgetpass/pppgetpass.sh pppgetpass
+	else
+		newsbin contrib/pppgetpass/pppgetpass.vt pppgetpass
+	fi
+	doman contrib/pppgetpass/pppgetpass.8
+}
+
+pkg_postinst() {
+	if linux-info_get_any_version && linux_config_src_exists ; then
+		echo
+		ewarn "If the following test report contains a missing kernel configuration option that you need,"
+		ewarn "you should reconfigure and rebuild your kernel before running pppd."
+		CONFIG_CHECK="~PPP ~PPP_ASYNC ~PPP_SYNC_TTY"
+		local ERROR_PPP="CONFIG_PPP:\t missing PPP support (REQUIRED)"
+		local ERROR_PPP_ASYNC="CONFIG_PPP_ASYNC:\t missing asynchronous serial line discipline (optional, but highly recommended)"
+		local WARNING_PPP_SYNC_TTY="CONFIG_PPP_SYNC_TTY:\t missing synchronous serial line discipline (optional; used by 'sync' pppd option)"
+		if use activefilter ; then
+			CONFIG_CHECK="${CONFIG_CHECK} ~PPP_FILTER"
+			local ERROR_PPP_FILTER="CONFIG_PPP_FILTER:\t missing PPP filtering support (REQUIRED)"
+		fi
+		CONFIG_CHECK="${CONFIG_CHECK} ~PPP_DEFLATE ~PPP_BSDCOMP ~PPP_MPPE"
+		local ERROR_PPP_DEFLATE="CONFIG_PPP_DEFLATE:\t missing Deflate compression (optional, but highly recommended)"
+		local ERROR_PPP_BSDCOMP="CONFIG_PPP_BSDCOMP:\t missing BSD-Compress compression (optional, but highly recommended)"
+		local WARNING_PPP_MPPE="CONFIG_PPP_MPPE:\t missing MPPE encryption (optional, mostly used by PPTP links)"
+		CONFIG_CHECK="${CONFIG_CHECK} ~PPPOE ~PACKET"
+		local WARNING_PPPOE="CONFIG_PPPOE:\t missing PPPoE support (optional, needed by pppoe plugin)"
+		local WARNING_PACKET="CONFIG_PACKET:\t missing AF_PACKET support (optional, used by pppoe and dhcpc plugins)"
+		if use atm ; then
+			CONFIG_CHECK="${CONFIG_CHECK} ~PPPOATM"
+			local WARNING_PPPOATM="CONFIG_PPPOATM:\t missing PPPoA support (optional, needed by pppoatm plugin)"
+		fi
+		check_extra_config
+	fi
+
+	# create *-secrets files if not exists
+	[[ -f "${EROOT}/etc/ppp/pap-secrets" ]] || \
+		cp -pP "${EROOT}/etc/ppp/pap-secrets.example" "${EROOT}/etc/ppp/pap-secrets"
+	[[ -f "${EROOT}/etc/ppp/chap-secrets" ]] || \
+		cp -pP "${EROOT}/etc/ppp/chap-secrets.example" "${EROOT}/etc/ppp/chap-secrets"
+
+	# lib name has changed
+	sed -i -e "s:^rp-\(pppoe.so\):\1:" "${EROOT}/etc/ppp/options" || die
+
+	echo
+	elog "Pon, poff and plog scripts have been supplied for experienced users."
+	elog "Users needing particular scripts (ssh,rsh,etc.) should check out the"
+	elog "/usr/share/doc/${PF}/scripts directory."
+
+	if [[ -n ${REPLACING_VERSIONS} ]] ; then
+		ewarn '"rp-pppoe.so" plugin has been renamed to "pppoe.so"'
+	fi
+}