net-misc/openssh: add patch to prevent username enumeration

Link: http://seclists.org/oss-sec/2018/q3/124
Package-Manager: Portage-2.3.46, Repoman-2.3.10

2 files changed, 445 insertions, 0 deletions

diff --git a/net-misc/openssh/Manifest b/net-misc/openssh/Manifest
index 533bb4cbc5ce..7baaf9672f06 100644
--- a/net-misc/openssh/Manifest
+++ b/net-misc/openssh/Manifest
@@ -8,6 +8,7 @@ DIST openssh-7.6p1-hpnssh14v12-r1.tar.xz 15440 BLAKE2B e140852a3ce63e4f744ed4b18
 DIST openssh-7.6p1.tar.gz 1489788 BLAKE2B 938bfeeff0a0aaa2fc7e4c345f04561c6c071c526e354a7d344a08742cb70ab1f4a41d325b31720f2fba5c4afa4db11f3fc87055c8c9c8bea37b29cc11dc8f39 SHA512 de17fdcb8239401f76740c8d689a8761802f6df94e68d953f3c70b9f4f8bdb403617c48c1d01cc8c368d88e9d50aee540bf03d5a36687dfb39dfd28d73029d72
 DIST openssh-7.7p1-hpnssh14v15-gentoo2.patch.xz 22060 BLAKE2B 9ee654f689d4b90bd0fe4f71d57b4a8d9d957012be3a23ff2baa6c45ae99e2f1e4daf5de24479a6a3eb761ee6847deb3c6c3021d4cbabc9089f605d8d7270efc SHA512 856d28ac89c14d01c40c7d7e93cfaebd74b091188b5b469550eb62aa5445177aec1a5f47c1e2f7173013712e98e5f9f5e46bbb3dbd4ec7c5ee8256ef45cda0f8
 DIST openssh-7.7p1-patches-1.1.tar.xz 16476 BLAKE2B fca2885a9e29faec40700ece37a995ba83e40bd2a6875129a5327770d8ee43663a7c063de33b4653994ed7332adb03730f613c047550d874190b95c66e2e9efa SHA512 aa5e33ce4bb4be16abf27ac1bade1dc85c51d82002be546402e0b8b0685de3ec7029f0f56bf1295ec346eb3960a6bed7cfc882722e57957a19a732f3174b3039
+DIST openssh-7.7p1-patches-1.2.tar.xz 17584 BLAKE2B 192ec01906c911197abec4606cdf136cf26ac4ab4c405267cd98bafaea409d9d596b2b985eaeda6a1425d587d63b6f403b988f280aff989357586bf232d27712 SHA512 e646ec3674b5ef38abe823406d33c8a47c5f63fa962c41386709a7ad7115d968b70fbcf7a8f3efc67a3e80e0194e8e22a01c2342c830f99970fe02532cdee51b
 DIST openssh-7.7p1-sctp-1.1.patch.xz 7548 BLAKE2B 3b960c2377351955007005de560c2a3e8d0d059a0435e5beda14c63e444dad8b4357edaccd1cfe446c6268514f152b2bcfa7fa3612f1ae1324a31fecb0e85ac5 SHA512 093605865262a2b972db8c92990a49ed6178ed4567fb2626518c826c8472553d9be99a9e6052a6f5e545d81867b4118e9fd8a2c0c26a2739f1720b0f13282cba
 DIST openssh-7.7p1-x509-11.3.1.patch.xz 362672 BLAKE2B 55b8b0ef00dc4d962a0db1115406b7b1e84110870c74198e9e4cb081b2ffde8daca67cb281c69d73b4c5cbffde361429d62634be194b57e888a0b434a0f42a37 SHA512 f84744f6d2e5a15017bce37bfa65ebb47dbafeac07ea9aab46bdc780b4062ff70687512d9d512cab81e3b9c701adb6ce17c5474f35cb4b49f57db2e2d45ac9ac
 DIST openssh-7.7p1.tar.gz 1536900 BLAKE2B 7aee360f2cea5bfa3f8426fcbd66fde2568f05f9c8e623326b60f03b7c5f8abf223e178aa1d5958015b51627565bf5b1ace35b57f309638c908f5a7bf5500d21 SHA512 597252cb48209a0cb98ca1928a67e8d63e4275252f25bc37269204c108f034baade6ba0634e32ae63422fddd280f73096a6b31ad2f2e7a848dde75ca30e14261
diff --git a/net-misc/openssh/openssh-7.7_p1-r8.ebuild b/net-misc/openssh/openssh-7.7_p1-r8.ebuild
new file mode 100644
index 000000000000..e9af1d2b7827
--- /dev/null
+++ b/net-misc/openssh/openssh-7.7_p1-r8.ebuild
@@ -0,0 +1,444 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit user flag-o-matic multilib autotools pam systemd versionator
+
+# Make it more portable between straight releases
+# and _p? releases.
+PARCH=${P/_}
+
+HPN_VER="14v15-gentoo2" HPN_PATCH="${PARCH}-hpnssh${HPN_VER}.patch.xz"
+SCTP_VER="1.1" SCTP_PATCH="${PARCH}-sctp-${SCTP_VER}.patch.xz"
+X509_VER="11.3.1" X509_PATCH="${PARCH}-x509-${X509_VER}.patch.xz"
+
+PATCH_SET="openssh-7.7p1-patches-1.2"
+
+DESCRIPTION="Port of OpenBSD's free SSH release"
+HOMEPAGE="https://www.openssh.com/"
+SRC_URI="mirror://openbsd/OpenSSH/portable/${PARCH}.tar.gz
+	https://dev.gentoo.org/~whissi/dist/${PN}/${PATCH_SET}.tar.xz
+	${SCTP_PATCH:+sctp? ( https://dev.gentoo.org/~whissi/dist/openssh/${SCTP_PATCH} )}
+	${HPN_PATCH:+hpn? ( https://dev.gentoo.org/~whissi/dist/openssh/${HPN_PATCH} )}
+	${X509_PATCH:+X509? ( https://dev.gentoo.org/~whissi/dist/openssh/${X509_PATCH} )}
+	"
+
+LICENSE="BSD GPL-2"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~ppc-aix ~x64-cygwin ~amd64-fbsd ~x86-fbsd ~amd64-linux ~arm-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~m68k-mint ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+# Probably want to drop ssl defaulting to on in a future version.
+IUSE="abi_mips_n32 audit bindist debug hpn kerberos kernel_linux ldns libedit libressl livecd pam +pie sctp selinux skey +ssl static test X X509"
+RESTRICT="!test? ( test )"
+REQUIRED_USE="ldns? ( ssl )
+	pie? ( !static )
+	static? ( !kerberos !pam )
+	X509? ( !sctp ssl )
+	test? ( ssl )"
+
+LIB_DEPEND="
+	audit? ( sys-process/audit[static-libs(+)] )
+	ldns? (
+		net-libs/ldns[static-libs(+)]
+		!bindist? ( net-libs/ldns[ecdsa,ssl(+)] )
+		bindist? ( net-libs/ldns[-ecdsa,ssl(+)] )
+	)
+	libedit? ( dev-libs/libedit:=[static-libs(+)] )
+	sctp? ( net-misc/lksctp-tools[static-libs(+)] )
+	selinux? ( >=sys-libs/libselinux-1.28[static-libs(+)] )
+	skey? ( >=sys-auth/skey-1.1.5-r1[static-libs(+)] )
+	ssl? (
+		!libressl? (
+			>=dev-libs/openssl-1.0.1:0=[bindist=]
+			dev-libs/openssl:0=[static-libs(+)]
+		)
+		libressl? ( dev-libs/libressl:0=[static-libs(+)] )
+	)
+	>=sys-libs/zlib-1.2.3:=[static-libs(+)]"
+RDEPEND="
+	!static? ( ${LIB_DEPEND//\[static-libs(+)]} )
+	pam? ( virtual/pam )
+	kerberos? ( virtual/krb5 )"
+DEPEND="${RDEPEND}
+	static? ( ${LIB_DEPEND} )
+	virtual/pkgconfig
+	virtual/os-headers
+	sys-devel/autoconf"
+RDEPEND="${RDEPEND}
+	pam? ( >=sys-auth/pambase-20081028 )
+	userland_GNU? ( virtual/shadow )
+	X? ( x11-apps/xauth )"
+
+S="${WORKDIR}/${PARCH}"
+
+pkg_pretend() {
+	# this sucks, but i'd rather have people unable to `emerge -u openssh`
+	# than not be able to log in to their server any more
+	maybe_fail() { [[ -z ${!2} ]] && echo "$1" ; }
+	local fail="
+		$(use hpn && maybe_fail hpn HPN_PATCH)
+		$(use sctp && maybe_fail sctp SCTP_PATCH)
+		$(use X509 && maybe_fail X509 X509_PATCH)
+	"
+	fail=$(echo ${fail})
+	if [[ -n ${fail} ]] ; then
+		eerror "Sorry, but this version does not yet support features"
+		eerror "that you requested:	 ${fail}"
+		eerror "Please mask ${PF} for now and check back later:"
+		eerror " # echo '=${CATEGORY}/${PF}' >> /etc/portage/package.mask"
+		die "booooo"
+	fi
+
+	# Make sure people who are using tcp wrappers are notified of its removal. #531156
+	if grep -qs '^ *sshd *:' "${EROOT%/}"/etc/hosts.{allow,deny} ; then
+		ewarn "Sorry, but openssh no longer supports tcp-wrappers, and it seems like"
+		ewarn "you're trying to use it.  Update your ${EROOT}etc/hosts.{allow,deny} please."
+	fi
+}
+
+src_prepare() {
+	sed -i \
+		-e "/_PATH_XAUTH/s:/usr/X11R6/bin/xauth:${EPREFIX%/}/usr/bin/xauth:" \
+		pathnames.h || die
+
+	# don't break .ssh/authorized_keys2 for fun
+	sed -i '/^AuthorizedKeysFile/s:^:#:' sshd_config || die
+
+	eapply "${FILESDIR}"/${PN}-7.7_p1-GSSAPI-dns.patch #165444 integrated into gsskex
+	eapply "${FILESDIR}"/${PN}-6.7_p1-openssl-ignore-status.patch
+	eapply "${FILESDIR}"/${PN}-7.5_p1-disable-conch-interop-tests.patch
+
+	local PATCHSET_VERSION_MACROS=()
+
+	if use X509 ; then
+		eapply "${WORKDIR}"/${X509_PATCH%.*}
+
+		# We need to patch package version or any X.509 sshd will reject our ssh client
+		# with "userauth_pubkey: could not parse key: string is too large [preauth]"
+		# error
+		einfo "Patching package version for X.509 patch set ..."
+		sed -i \
+			-e "s/^AC_INIT(\[OpenSSH\], \[Portable\]/AC_INIT([OpenSSH], [${X509_VER}]/" \
+			"${S}"/configure.ac || die "Failed to patch package version for X.509 patch"
+
+		einfo "Patching version.h to expose X.509 patch set ..."
+		sed -i \
+			-e "/^#define SSH_PORTABLE.*/a #define SSH_X509               \"-PKIXSSH-${X509_VER}\"" \
+			"${S}"/version.h || die "Failed to sed-in X.509 patch version"
+		PATCHSET_VERSION_MACROS+=( 'SSH_X509' )
+
+		einfo "Disabling broken X.509 agent test ..."
+		sed -i \
+			-e "/^ agent$/d" \
+			"${S}"/tests/CA/config || die "Failed to disable broken X.509 agent test"
+
+		# The following patches don't apply on top of X509 patch
+		rm "${WORKDIR}"/patch/2002_all_openssh-7.7p1_upstream_bug2840.patch || die
+		rm "${WORKDIR}"/patch/2009_all_openssh-7.7p1_make-shell-tests-portable.patch || die
+		rm "${WORKDIR}"/patch/2016_all_openssh-7.7p1_implement-EMFILE-mitigation-for-ssh-agent.patch || die
+		rm "${WORKDIR}"/patch/2025_all_openssh-7.7p1_prefer-argv0-to-ssh-when-re-executing-ssh-for-proxyjump.patch || die
+	else
+		rm "${WORKDIR}"/patch/2016_all_openssh-7.7p1-X509_implement-EMFILE-mitigation-for-ssh-agent.patch || die
+		rm "${WORKDIR}"/patch/2025_all_openssh-7.7p1-X509_prefer-argv0-to-ssh-when-re-executing-ssh-for-proxyjump.patch || die
+	fi
+
+	if use sctp ; then
+		eapply "${WORKDIR}"/${SCTP_PATCH%.*}
+
+		einfo "Patching version.h to expose SCTP patch set ..."
+		sed -i \
+			-e "/^#define SSH_PORTABLE/a #define SSH_SCTP        \"-sctp-${SCTP_VER}\"" \
+			"${S}"/version.h || die "Failed to sed-in SCTP patch version"
+		PATCHSET_VERSION_MACROS+=( 'SSH_SCTP' )
+
+		einfo "Disabling know failing test (cfgparse) caused by SCTP patch ..."
+		sed -i \
+			-e "/\t\tcfgparse \\\/d" \
+			"${S}"/regress/Makefile || die "Failed to disable known failing test (cfgparse) caused by SCTP patch"
+	fi
+
+	if use hpn ; then
+		eapply "${WORKDIR}"/${HPN_PATCH%.*}
+
+		einfo "Patching Makefile.in for HPN patch set ..."
+		sed -i \
+			-e "/^LIBS=/ s/\$/ -lpthread/" \
+			"${S}"/Makefile.in || die "Failed to patch Makefile.in"
+
+		einfo "Patching version.h to expose HPN patch set ..."
+		sed -i \
+			-e "/^#define SSH_PORTABLE/a #define SSH_HPN         \"-hpn${HPN_VER}\"" \
+			"${S}"/version.h || die "Failed to sed-in HPN patch version"
+		PATCHSET_VERSION_MACROS+=( 'SSH_HPN' )
+
+		if [[ -n "${HPN_DISABLE_MTAES}" ]] ; then
+			einfo "Disabling known non-working MT AES cipher per default ..."
+
+			cat > "${T}"/disable_mtaes.conf <<- EOF
+
+			# HPN's Multi-Threaded AES CTR cipher is currently known to be broken
+			# and therefore disabled per default.
+			DisableMTAES yes
+			EOF
+			sed -i \
+				-e "/^#HPNDisabled.*/r ${T}/disable_mtaes.conf" \
+				"${S}"/sshd_config || die "Failed to disabled MT AES ciphers in sshd_config"
+
+			sed -i \
+				-e "/AcceptEnv.*_XXX_TEST$/a \\\tDisableMTAES\t\tyes" \
+				"${S}"/regress/test-exec.sh || die "Failed to disable MT AES ciphers in test config"
+		fi
+	fi
+
+	if use X509 || use hpn ; then
+		einfo "Patching packet.c for X509 and/or HPN patch set ..."
+		sed -i \
+			-e "s/const struct sshcipher/struct sshcipher/" \
+			"${S}"/packet.c || die "Failed to patch ssh_packet_set_connection() (packet.c)"
+	fi
+
+	if use X509 || use sctp || use hpn ; then
+		einfo "Patching sshconnect.c to use SSH_RELEASE in send_client_banner() ..."
+		sed -i \
+			-e "s/PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_VERSION/PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_RELEASE/" \
+			"${S}"/sshconnect.c || die "Failed to patch send_client_banner() to use SSH_RELEASE (sshconnect.c)"
+
+		einfo "Patching sshd.c to use SSH_RELEASE in sshd_exchange_identification() ..."
+		sed -i \
+			-e "s/PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_VERSION/PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_RELEASE/" \
+			"${S}"/sshd.c || die "Failed to patch sshd_exchange_identification() to use SSH_RELEASE (sshd.c)"
+
+		einfo "Patching version.h to add our patch sets to SSH_RELEASE ..."
+		sed -i \
+			-e "s/^#define SSH_RELEASE.*/#define SSH_RELEASE     SSH_VERSION SSH_PORTABLE ${PATCHSET_VERSION_MACROS[*]}/" \
+			"${S}"/version.h || die "Failed to patch SSH_RELEASE (version.h)"
+	fi
+
+	sed -i \
+		-e "/#UseLogin no/d" \
+		"${S}"/sshd_config || die "Failed to remove removed UseLogin option (sshd_config)"
+
+	eapply "${WORKDIR}"/patch/*.patch
+
+	eapply_user #473004
+
+	tc-export PKG_CONFIG
+	local sed_args=(
+		-e "s:-lcrypto:$(${PKG_CONFIG} --libs openssl):"
+		# Disable PATH reset, trust what portage gives us #254615
+		-e 's:^PATH=/:#PATH=/:'
+		# Disable fortify flags ... our gcc does this for us
+		-e 's:-D_FORTIFY_SOURCE=2::'
+	)
+
+	# The -ftrapv flag ICEs on hppa #505182
+	use hppa && sed_args+=(
+		-e '/CFLAGS/s:-ftrapv:-fdisable-this-test:'
+		-e '/OSSH_CHECK_CFLAG_LINK.*-ftrapv/d'
+	)
+	# _XOPEN_SOURCE causes header conflicts on Solaris
+	[[ ${CHOST} == *-solaris* ]] && sed_args+=(
+		-e 's/-D_XOPEN_SOURCE//'
+	)
+	sed -i "${sed_args[@]}" configure{.ac,} || die
+
+	eautoreconf
+}
+
+src_configure() {
+	addwrite /dev/ptmx
+
+	use debug && append-cppflags -DSANDBOX_SECCOMP_FILTER_DEBUG
+	use static && append-ldflags -static
+
+	local myconf=(
+		--with-ldflags="${LDFLAGS}"
+		--disable-strip
+		--with-pid-dir="${EPREFIX}"$(usex kernel_linux '' '/var')/run
+		--sysconfdir="${EPREFIX%/}"/etc/ssh
+		--libexecdir="${EPREFIX%/}"/usr/$(get_libdir)/misc
+		--datadir="${EPREFIX%/}"/usr/share/openssh
+		--with-privsep-path="${EPREFIX%/}"/var/empty
+		--with-privsep-user=sshd
+		$(use_with audit audit linux)
+		$(use_with kerberos kerberos5 "${EPREFIX%/}"/usr)
+		# We apply the sctp patch conditionally, so can't pass --without-sctp
+		# unconditionally else we get unknown flag warnings.
+		$(use sctp && use_with sctp)
+		$(use_with ldns)
+		$(use_with libedit)
+		$(use_with pam)
+		$(use_with pie)
+		$(use_with selinux)
+		$(use_with skey)
+		$(use_with ssl openssl)
+		$(use_with ssl md5-passwords)
+		$(use_with ssl ssl-engine)
+	)
+
+	# stackprotect is broken on musl x86
+	use elibc_musl && use x86 && myconf+=( --without-stackprotect )
+
+	# The seccomp sandbox is broken on x32, so use the older method for now. #553748
+	use amd64 && [[ ${ABI} == "x32" ]] && myconf+=( --with-sandbox=rlimit )
+
+	econf "${myconf[@]}"
+}
+
+src_test() {
+	local t skipped=() failed=() passed=()
+	local tests=( interop-tests compat-tests )
+
+	local shell=$(egetshell "${UID}")
+	if [[ ${shell} == */nologin ]] || [[ ${shell} == */false ]] ; then
+		elog "Running the full OpenSSH testsuite requires a usable shell for the 'portage'"
+		elog "user, so we will run a subset only."
+		skipped+=( tests )
+	else
+		tests+=( tests )
+	fi
+
+	# It will also attempt to write to the homedir .ssh.
+	local sshhome=${T}/homedir
+	mkdir -p "${sshhome}"/.ssh
+	for t in "${tests[@]}" ; do
+		# Some tests read from stdin ...
+		HOMEDIR="${sshhome}" HOME="${sshhome}" \
+		emake -k -j1 ${t} </dev/null \
+			&& passed+=( "${t}" ) \
+			|| failed+=( "${t}" )
+	done
+
+	einfo "Passed tests: ${passed[*]}"
+	[[ ${#skipped[@]} -gt 0 ]] && ewarn "Skipped tests: ${skipped[*]}"
+	[[ ${#failed[@]}  -gt 0 ]] && die "Some tests failed: ${failed[*]}"
+}
+
+# Gentoo tweaks to default config files.
+tweak_ssh_configs() {
+	local locale_vars=(
+		# These are language variables that POSIX defines.
+		# http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_02
+		LANG LC_ALL LC_COLLATE LC_CTYPE LC_MESSAGES LC_MONETARY LC_NUMERIC LC_TIME
+
+		# These are the GNU extensions.
+		# https://www.gnu.org/software/autoconf/manual/html_node/Special-Shell-Variables.html
+		LANGUAGE LC_ADDRESS LC_IDENTIFICATION LC_MEASUREMENT LC_NAME LC_PAPER LC_TELEPHONE
+	)
+
+	# First the server config.
+	cat <<-EOF >> "${ED%/}"/etc/ssh/sshd_config
+
+	# Allow client to pass locale environment variables. #367017
+	AcceptEnv ${locale_vars[*]}
+
+	# Allow client to pass COLORTERM to match TERM. #658540
+	AcceptEnv COLORTERM
+	EOF
+
+	# Then the client config.
+	cat <<-EOF >> "${ED%/}"/etc/ssh/ssh_config
+
+	# Send locale environment variables. #367017
+	SendEnv ${locale_vars[*]}
+
+	# Send COLORTERM to match TERM. #658540
+	SendEnv COLORTERM
+	EOF
+
+	if use pam ; then
+		sed -i \
+			-e "/^#UsePAM /s:.*:UsePAM yes:" \
+			-e "/^#PasswordAuthentication /s:.*:PasswordAuthentication no:" \
+			-e "/^#PrintMotd /s:.*:PrintMotd no:" \
+			-e "/^#PrintLastLog /s:.*:PrintLastLog no:" \
+			"${ED%/}"/etc/ssh/sshd_config || die
+	fi
+
+	if use livecd ; then
+		sed -i \
+			-e '/^#PermitRootLogin/c# Allow root login with password on livecds.\nPermitRootLogin Yes' \
+			"${ED%/}"/etc/ssh/sshd_config || die
+	fi
+}
+
+src_install() {
+	emake install-nokeys DESTDIR="${D}"
+	fperms 600 /etc/ssh/sshd_config
+	dobin contrib/ssh-copy-id
+	newinitd "${FILESDIR}"/sshd.rc6.5 sshd
+	newconfd "${FILESDIR}"/sshd-r1.confd sshd
+
+	newpamd "${FILESDIR}"/sshd.pam_include.2 sshd
+
+	tweak_ssh_configs
+
+	doman contrib/ssh-copy-id.1
+	dodoc CREDITS OVERVIEW README* TODO sshd_config
+	use hpn && dodoc HPN-README
+	use X509 || dodoc ChangeLog
+
+	diropts -m 0700
+	dodir /etc/skel/.ssh
+
+	keepdir /var/empty
+
+	systemd_dounit "${FILESDIR}"/sshd.{service,socket}
+	systemd_newunit "${FILESDIR}"/sshd_at.service 'sshd@.service'
+}
+
+pkg_preinst() {
+	enewgroup sshd 22
+	enewuser sshd 22 -1 /var/empty sshd
+}
+
+pkg_postinst() {
+	if has_version "<${CATEGORY}/${PN}-5.8_p1" ; then
+		elog "Starting with openssh-5.8p1, the server will default to a newer key"
+		elog "algorithm (ECDSA).  You are encouraged to manually update your stored"
+		elog "keys list as servers update theirs.  See ssh-keyscan(1) for more info."
+	fi
+	if has_version "<${CATEGORY}/${PN}-7.0_p1" ; then
+		elog "Starting with openssh-6.7, support for USE=tcpd has been dropped by upstream."
+		elog "Make sure to update any configs that you might have.  Note that xinetd might"
+		elog "be an alternative for you as it supports USE=tcpd."
+	fi
+	if has_version "<${CATEGORY}/${PN}-7.1_p1" ; then #557388 #555518
+		elog "Starting with openssh-7.0, support for ssh-dss keys were disabled due to their"
+		elog "weak sizes.  If you rely on these key types, you can re-enable the key types by"
+		elog "adding to your sshd_config or ~/.ssh/config files:"
+		elog "	PubkeyAcceptedKeyTypes=+ssh-dss"
+		elog "You should however generate new keys using rsa or ed25519."
+
+		elog "Starting with openssh-7.0, the default for PermitRootLogin changed from 'yes'"
+		elog "to 'prohibit-password'.  That means password auth for root users no longer works"
+		elog "out of the box.  If you need this, please update your sshd_config explicitly."
+	fi
+	if has_version "<${CATEGORY}/${PN}-7.6_p1" ; then
+		elog "Starting with openssh-7.6p1, openssh upstream has removed ssh1 support entirely."
+		elog "Furthermore, rsa keys with less than 1024 bits will be refused."
+	fi
+	if has_version "<${CATEGORY}/${PN}-7.7_p1" ; then
+		elog "Starting with openssh-7.7p1, we no longer patch openssh to provide LDAP functionality."
+		elog "Install sys-auth/ssh-ldap-pubkey and use OpenSSH's \"AuthorizedKeysCommand\" option"
+		elog "if you need to authenticate against LDAP."
+		elog "See https://wiki.gentoo.org/wiki/SSH/LDAP_migration for more details."
+	fi
+	if ! use ssl && has_version "${CATEGORY}/${PN}[ssl]" ; then
+		elog "Be aware that by disabling openssl support in openssh, the server and clients"
+		elog "no longer support dss/rsa/ecdsa keys.  You will need to generate ed25519 keys"
+		elog "and update all clients/servers that utilize them."
+	fi
+
+	if use hpn && [[ -n "${HPN_DISABLE_MTAES}" ]] ; then
+		elog ""
+		elog "HPN's multi-threaded AES CTR cipher is currently known to be broken"
+		elog "and therefore disabled at runtime per default."
+		elog "Make sure your sshd_config is up to date and contains"
+		elog ""
+		elog "  DisableMTAES yes"
+		elog ""
+		elog "Otherwise you maybe unable to connect to this sshd using any AES CTR cipher."
+		elog ""
+	fi
+}