# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

# Remember to check the upstream release/stable branches for patches
# to backport! See https://marc.info/?l=openssh-unix-dev&m=172723798122122&w=2.

VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/openssh.org.asc
inherit user-info flag-o-matic autotools optfeature pam systemd toolchain-funcs verify-sig eapi9-ver

MY_PN=${PN/-legacy}
MY_P=${MY_PN}-${PV}
# Make it more portable between straight releases
# and _p? releases.
PARCH=${MY_P/_}

DESCRIPTION="Old versions of OpenSSH installed separately for legacy machines"
HOMEPAGE="https://www.openssh.com/"
SRC_URI="
	mirror://openbsd/OpenSSH/portable/${PARCH}.tar.gz
	verify-sig? ( mirror://openbsd/OpenSSH/portable/${PARCH}.tar.gz.asc )
	https://dev.gentoo.org/~floppym/dist/${MY_P}-backports.tar.gz
"
S="${WORKDIR}/${PARCH}"

LICENSE="BSD GPL-2"
SLOT="0"
KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc x86 ~arm64-macos ~x64-macos ~x64-solaris"
# Probably want to drop ssl defaulting to on in a future version.
IUSE="abi_mips_n32 audit debug kerberos ldns +legacy-ciphers libedit livecd pam +pie security-key selinux +ssl static test xmss"

RESTRICT="!test? ( test )"

REQUIRED_USE="
	ldns? ( ssl )
	pie? ( !static )
	static? ( !kerberos !pam )
	xmss? ( ssl  )
	test? ( ssl )
"

# tests currently fail with XMSS
REQUIRED_USE+="test? ( !xmss )"

LIB_DEPEND="
	audit? ( sys-process/audit[static-libs(+)] )
	ldns? (
		net-libs/ldns[static-libs(+)]
		net-libs/ldns[ecdsa(+),ssl(+)]
	)
	libedit? ( dev-libs/libedit:=[static-libs(+)] )
	security-key? ( >=dev-libs/libfido2-1.5.0:=[static-libs(+)] )
	selinux? ( >=sys-libs/libselinux-1.28[static-libs(+)] )
	ssl? ( >=dev-libs/openssl-1.1.1l-r1:0=[static-libs(+)] )
	virtual/libcrypt:=[static-libs(+)]
	>=virtual/zlib-1.2.3:=[static-libs(+)]
"
RDEPEND="
	acct-group/sshd
	acct-user/sshd
	!static? ( ${LIB_DEPEND//\[static-libs(+)]} )
	pam? ( sys-libs/pam )
	kerberos? ( virtual/krb5 )
"
DEPEND="
	${RDEPEND}
	virtual/os-headers
	kernel_linux? ( !prefix-guest? ( >=sys-kernel/linux-headers-5.1 ) )
	static? ( ${LIB_DEPEND} )
"
RDEPEND="
	${RDEPEND}
	!net-misc/openssh-contrib
	pam? ( >=sys-auth/pambase-20081028 )
	!prefix? ( sys-apps/shadow )
"
BDEPEND="
	dev-build/autoconf
	virtual/pkgconfig
	verify-sig? ( sec-keys/openpgp-keys-openssh )
"

PATCHES=(
	"${FILESDIR}/${MY_PN}-9.4_p1-Allow-MAP_NORESERVE-in-sandbox-seccomp-filter-maps.patch"
	"${FILESDIR}/${MY_PN}-9.6_p1-fix-xmss-c99.patch"
	"${FILESDIR}/${MY_PN}-9.7_p1-config-tweaks.patch"
	# Backports from upstream release branch
	"${WORKDIR}/${MY_P}-backports"
	# Our own backports
	"${FILESDIR}/${MY_PN}-9.9_p1-x-forwarding-slow.patch"
	"${FILESDIR}/0001-Accept-OpenSSL-4.0.0-dev-versions.patch"
	"${FILESDIR}/0001-upstream-pkcs11_fetch_ecdsa_pubkey-use-ASN1_STRING-a.patch"
)

pkg_pretend() {
	local i enabled_eol_flags disabled_eol_flags
	for i in hpn sctp X509; do
		if has_version "net-misc/openssh[${i}]"; then
			enabled_eol_flags+="${i},"
			disabled_eol_flags+="-${i},"
		fi
	done

	if [[ -n ${enabled_eol_flags} && ${OPENSSH_EOL_USE_FLAGS_I_KNOW_WHAT_I_AM_DOING} != yes ]]; then
		# Skip for binary packages entirely because of environment saving, bug #907892
		[[ ${MERGE_TYPE} == binary ]] && return

		ewarn "net-misc/openssh does not support USE='${enabled_eol_flags%,}' anymore."
		ewarn "The Base system team *STRONGLY* recommends you not rely on this functionality,"
		ewarn "since these USE flags required third-party patches that often trigger bugs"
		ewarn "and are of questionable provenance."
		ewarn
		ewarn "If you must continue relying on this functionality, switch to"
		ewarn "net-misc/openssh-contrib. You will have to remove net-misc/openssh from your"
		ewarn "world file first: 'emerge --deselect net-misc/openssh'"
		ewarn
		ewarn "In order to prevent loss of SSH remote login access, we will abort the build."
		ewarn "Whether you proceed with disabling the USE flags or switch to the -contrib"
		ewarn "variant, when re-emerging you will have to set"
		ewarn
		ewarn "  OPENSSH_EOL_USE_FLAGS_I_KNOW_WHAT_I_AM_DOING=yes"

		die "Building net-misc/openssh[${disabled_eol_flags%,}] without OPENSSH_EOL_USE_FLAGS_I_KNOW_WHAT_I_AM_DOING=yes"
	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_unpack() {
	if use verify-sig ; then
		verify-sig_verify_detached "${DISTDIR}"/${PARCH}.tar.gz{,.asc}
	fi

	default
}

src_prepare() {
	# don't break .ssh/authorized_keys2 for fun
	sed -i '/^AuthorizedKeysFile/s:^:#:' sshd_config || die

	[[ -d ${WORKDIR}/patches ]] && PATCHES+=( "${WORKDIR}"/patches )

	default

	# These tests are currently incompatible with PORTAGE_TMPDIR/sandbox
	sed -e '/\t\tpercent \\/ d' \
		-i regress/Makefile || die

	tc-export PKG_CONFIG
	local sed_args=(
		-e "s:-lcrypto:$(${PKG_CONFIG} --libs openssl):"
		# Disable fortify flags ... our gcc does this for us
		-e 's:-D_FORTIFY_SOURCE=2::'
	)

	# _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
	use xmss && append-cflags -DWITH_XMSS

	if [[ ${CHOST} == *-solaris* ]] ; then
		# Solaris' glob.h doesn't have things like GLOB_TILDE, configure
		# doesn't check for this, so force the replacement to be put in
		# place
		append-cppflags -DBROKEN_GLOB
	fi

	# use replacement, RPF_ECHO_ON doesn't exist here
	[[ ${CHOST} == *-darwin* ]] && export ac_cv_func_readpassphrase=no

	local myconf=(
		--with-ldflags="${LDFLAGS}"
		--disable-strip
		--with-pid-dir="${EPREFIX}"$(usex kernel_linux '' '/var')/run
		--prefix="${EPREFIX}"/usr/lib/${PN}
		--sysconfdir="${EPREFIX}"/usr/lib/${PN}/etc/ssh
		--datadir="${EPREFIX}"/usr/lib/${PN}/share/${MY_PN}
		--libexecdir="${EPREFIX}"/usr/lib/${PN}/$(get_libdir)/misc
		--mandir="${EPREFIX}"/usr/lib/${PN}/man
		--with-privsep-path="${EPREFIX}"/var/empty
		--with-privsep-user=sshd
		# optional at runtime; guarantee a known path
		--with-xauth="${EPREFIX}"/usr/bin/xauth

		# --with-hardening adds the following in addition to flags we
		# already set in our toolchain:
		# * -ftrapv (which is broken with GCC anyway),
		# * -ftrivial-auto-var-init=zero (which is nice, but not the end of
		#    the world to not have)
		# * -fzero-call-used-regs=used (history of miscompilations with
		#    Clang (bug #872548), ICEs on m68k (bug #920350, gcc PR113086,
		#    gcc PR104820, gcc PR104817, gcc PR110934)).
		#
		# Furthermore, OSSH_CHECK_CFLAG_COMPILE does not use AC_CACHE_CHECK,
		# so we cannot just disable -fzero-call-used-regs=used.
		#
		# Therefore, just pass --without-hardening, given it doesn't negate
		# our already hardened toolchain defaults, and avoids adding flags
		# which are known-broken in both Clang and GCC and haven't been
		# proven reliable.
		--without-hardening

		$(use_with audit audit linux)
		$(use_with kerberos kerberos5 "${EPREFIX}"/usr)
		$(use_with ldns)
		$(use_enable legacy-ciphers dsa-keys)
		$(use_with libedit)
		$(use_with pam)
		$(use_with pie)
		$(use_with selinux)
		$(use_with security-key security-key-builtin)
		$(use_with ssl openssl)
	)

	if has_version "<dev-libs/openssl-4" ; then
		# bug #973058
		myconf+=( $(use_with ssl ssl-engine) )
	fi

	if use elibc_musl; then
		# musl defines bogus values for UTMP_FILE and WTMP_FILE (bug #753230)
		myconf+=( --disable-utmp --disable-wtmp )
	fi

	# Workaround for Clang 15 miscompilation with -fzero-call-used-regs=all
	# bug #869839 (https://github.com/llvm/llvm-project/issues/57692)
	tc-is-clang && myconf+=( --without-hardening )

	econf "${myconf[@]}"
}

create_config_dropins() {
	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
	)

	mkdir -p "${WORKDIR}"/etc/ssh/ssh{,d}_config.d || die

	cat <<-EOF > "${WORKDIR}"/etc/ssh/ssh_config.d/9999999gentoo.conf || die
	# Send locale environment variables (bug #367017)
	SendEnv ${locale_vars[*]}

	# Send COLORTERM to match TERM (bug #658540)
	SendEnv COLORTERM
	EOF

	cat <<-EOF > "${WORKDIR}"/etc/ssh/ssh_config.d/9999999gentoo-security.conf || die
	RevokedHostKeys "${EPREFIX}/etc/ssh/ssh_revoked_hosts"
	EOF

	cat <<-EOF > "${WORKDIR}"/etc/ssh/ssh_revoked_hosts || die
	# https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/
	ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==
	EOF

	cat <<-EOF > "${WORKDIR}"/etc/ssh/sshd_config.d/9999999gentoo.conf || die
	# Allow client to pass locale environment variables (bug #367017)
	AcceptEnv ${locale_vars[*]}

	# Allow client to pass COLORTERM to match TERM (bug #658540)
	AcceptEnv COLORTERM
	EOF

	cat <<-EOF > "${WORKDIR}"/etc/ssh/sshd_config.d/9999999gentoo-subsystem.conf || die
	# override default of no subsystems
	Subsystem	sftp	${EPREFIX}/usr/$(get_libdir)/misc/sftp-server
	EOF

	if use pam ; then
		cat <<-EOF > "${WORKDIR}"/etc/ssh/sshd_config.d/9999999gentoo-pam.conf || die
		UsePAM yes
		# This interferes with PAM.
		PasswordAuthentication no
		# PAM can do its own handling of MOTD.
		PrintMotd no
		PrintLastLog no
		EOF
	fi

	if use livecd ; then
		cat <<-EOF > "${WORKDIR}"/etc/ssh/sshd_config.d/9999999gentoo-livecd.conf || die
		# Allow root login with password on livecds.
		PermitRootLogin Yes
		EOF
	fi
}

src_compile() {
	default
	create_config_dropins
}

src_test() {
	local tests=( compat-tests )
	local shell=$(egetshell "${UID}")
	if [[ ${shell} == */nologin ]] || [[ ${shell} == */false ]] ; then
		ewarn "Running the full OpenSSH testsuite requires a usable shell for the 'portage'"
		ewarn "user, so we will run a subset only."
		tests+=( interop-tests )
	else
		tests+=( tests )
	fi

	local -x SUDO= SSH_SK_PROVIDER= TEST_SSH_UNSAFE_PERMISSIONS=1
	mkdir -p "${HOME}"/.ssh || die
	emake -j1 "${tests[@]}" </dev/null
}

src_install() {
	emake install-nokeys DESTDIR="${D}"
	fperms 600 /usr/lib/${PN}/etc/ssh/sshd_config
	newbin contrib/ssh-copy-id ssh-copy-id-legacy
	newinitd "${FILESDIR}"/sshd-r1.initd sshd-legacy
	newconfd "${FILESDIR}"/sshd-r1.confd sshd-legacy
	exeinto /etc/user/init.d
	newexe "${FILESDIR}"/ssh-agent.initd ssh-agent-legacy

	if use pam; then
		newpamd "${FILESDIR}"/sshd.pam_include.2 sshd-legacy
	fi

	newman contrib/ssh-copy-id.1 ssh-copy-id-legacy.1
	dodoc ChangeLog CREDITS OVERVIEW README* TODO sshd_config

	rmdir "${ED}"/var/empty || die

	systemd_newunit "${FILESDIR}"/sshd.socket sshd-legacy.socket
	systemd_newunit "${FILESDIR}"/sshd.service.2 sshd-legacy.service
	systemd_newunit "${FILESDIR}"/sshd_at.service.1 'sshd-legacy@.service'

	# Install dropins with explicit mode, bug 906638, 915840
	diropts -m0755
	insopts -m0644
	insinto /usr/lib/${PN}/etc/ssh
	doins -r "${WORKDIR}"/etc/ssh/ssh_config.d
	doins "${WORKDIR}"/etc/ssh/ssh_revoked_hosts
	diropts -m0700
	insopts -m0600
	doins -r "${WORKDIR}"/etc/ssh/sshd_config.d
}

pkg_preinst() {
	if ! use ssl && has_version "${CATEGORY}/${MY_PN}[ssl]"; then
		show_ssl_warning=1
	fi
}

pkg_postinst() {
	# bug #139235
	optfeature "x11 forwarding" x11-apps/xauth

	if ver_replacing -lt "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 ver_replacing -lt "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 [[ -n ${show_ssl_warning} ]]; 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

	openssh_maybe_restart
}

openssh_maybe_restart() {
	local ver
	declare -a versions
	read -ra versions <<<"${REPLACING_VERSIONS}"
	for ver in "${versions[@]}"; do
		# Exclude 9.8_p1 because it didn't have the safety check
		[[ ${ver} == 9.8_p1 ]] && break

		if [[ ${ver%_*} == "${PV%_*}" ]]; then
			# No major version change has occurred
			return
		fi
	done

	if [[ ${ROOT} ]]; then
		return
	elif [[ -d /run/systemd/system ]] && sshd -t >/dev/null 2>&1; then
		ewarn "The ebuild will now attempt to restart OpenSSH to avoid"
		ewarn "bricking the running instance. See bug #709748."
		ebegin "Attempting to restart openssh via 'systemctl try-restart sshd'"
		systemctl try-restart sshd
		eend $?
	elif [[ -d /run/openrc ]]; then
		# We don't check for sshd -t here because the OpenRC init script
		# has a stop_pre() which does checkconfig, i.e. we defer to it
		# to give nicer output for a failed sanity check.
		ewarn "The ebuild will now attempt to restart OpenSSH to avoid"
		ewarn "bricking the running instance. See bug #709748."
		ebegin "Attempting to restart openssh via 'rc-service -q --ifstarted --nodeps sshd restart'"
		rc-service -q --ifstarted --nodeps sshd restart
		eend $?
	fi
}