sys-apps/shadow: Security revbump to fix CVE-2017-2616 (bug #610804).

Package-Manager: Portage-2.3.3, Repoman-2.3.1

2 files changed, 277 insertions, 0 deletions

diff --git a/sys-apps/shadow/files/shadow-4.4-CVE-2017-2616.patch b/sys-apps/shadow/files/shadow-4.4-CVE-2017-2616.patch
new file mode 100644
index 000000000000..b788ec35342f
--- /dev/null
+++ b/sys-apps/shadow/files/shadow-4.4-CVE-2017-2616.patch
@@ -0,0 +1,62 @@
+From 08fd4b69e84364677a10e519ccb25b71710ee686 Mon Sep 17 00:00:00 2001
+From: Tobias Stoeckmann <tobias@stoeckmann.org>
+Date: Thu, 23 Feb 2017 09:47:29 -0600
+Subject: [PATCH] su: properly clear child PID
+
+If su is compiled with PAM support, it is possible for any local user
+to send SIGKILL to other processes with root privileges. There are
+only two conditions. First, the user must be able to perform su with
+a successful login. This does NOT have to be the root user, even using
+su with the same id is enough, e.g. "su $(whoami)". Second, SIGKILL
+can only be sent to processes which were executed after the su process.
+It is not possible to send SIGKILL to processes which were already
+running. I consider this as a security vulnerability, because I was
+able to write a proof of concept which unlocked a screen saver of
+another user this way.
+---
+ src/su.c | 19 +++++++++++++++++--
+ 1 file changed, 17 insertions(+), 2 deletions(-)
+
+diff --git a/src/su.c b/src/su.c
+index f20d230..d86aa86 100644
+--- a/src/su.c
++++ b/src/su.c
+@@ -379,11 +379,13 @@ static void prepare_pam_close_session (void)
+ 				/* wake child when resumed */
+ 				kill (pid, SIGCONT);
+ 				stop = false;
++			} else {
++				pid_child = 0;
+ 			}
+ 		} while (!stop);
+ 	}
+ 
+-	if (0 != caught) {
++	if (0 != caught && 0 != pid_child) {
+ 		(void) fputs ("\n", stderr);
+ 		(void) fputs (_("Session terminated, terminating shell..."),
+ 		              stderr);
+@@ -393,9 +395,22 @@ static void prepare_pam_close_session (void)
+ 		snprintf (wait_msg, sizeof wait_msg, _(" ...waiting for child to terminate.\n"));
+ 
+ 		(void) signal (SIGALRM, kill_child);
++		(void) signal (SIGCHLD, catch_signals);
+ 		(void) alarm (2);
+ 
+-		(void) wait (&status);
++		sigemptyset (&ourset);
++		if ((sigaddset (&ourset, SIGALRM) != 0)
++		    || (sigprocmask (SIG_BLOCK, &ourset, NULL) != 0)) {
++			fprintf (stderr, _("%s: signal masking malfunction\n"), Prog);
++			kill_child (0);
++		} else {
++			while (0 == waitpid (pid_child, &status, WNOHANG)) {
++				sigsuspend (&ourset);
++			}
++			pid_child = 0;
++			(void) sigprocmask (SIG_UNBLOCK, &ourset, NULL);
++		}
++
+ 		(void) fputs (_(" ...terminated.\n"), stderr);
+ 	}
+ 
diff --git a/sys-apps/shadow/shadow-4.4-r2.ebuild b/sys-apps/shadow/shadow-4.4-r2.ebuild
new file mode 100644
index 000000000000..b28554f17f17
--- /dev/null
+++ b/sys-apps/shadow/shadow-4.4-r2.ebuild
@@ -0,0 +1,215 @@
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI="5"
+
+inherit eutils libtool pam multilib
+
+DESCRIPTION="Utilities to deal with user accounts"
+HOMEPAGE="https://github.com/shadow-maint/shadow http://pkg-shadow.alioth.debian.org/"
+SRC_URI="https://github.com/shadow-maint/shadow/releases/download/${PV}/${P}.tar.gz"
+
+LICENSE="BSD GPL-2"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86"
+IUSE="acl audit cracklib nls pam selinux skey xattr"
+# Taken from the man/Makefile.am file.
+LANGS=( cs da de es fi fr hu id it ja ko pl pt_BR ru sv tr zh_CN zh_TW )
+IUSE+=" $(printf 'linguas_%s ' ${LANGS[*]})"
+
+RDEPEND="acl? ( sys-apps/acl:0= )
+	audit? ( >=sys-process/audit-2.6:0= )
+	cracklib? ( >=sys-libs/cracklib-2.7-r3:0= )
+	pam? ( virtual/pam:0= )
+	skey? ( sys-auth/skey:0= )
+	selinux? (
+		>=sys-libs/libselinux-1.28:0=
+		sys-libs/libsemanage:0=
+	)
+	nls? ( virtual/libintl )
+	xattr? ( sys-apps/attr:0= )"
+DEPEND="${RDEPEND}
+	app-arch/xz-utils
+	nls? ( sys-devel/gettext )"
+RDEPEND="${RDEPEND}
+	pam? ( >=sys-auth/pambase-20150213 )"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-4.1.3-dots-in-usernames.patch
+	"${FILESDIR}"/${P}-su-snprintf.patch
+	"${FILESDIR}"/${P}-prototypes.patch
+	"${FILESDIR}"/${P}-load_defaults.patch
+	"${FILESDIR}"/${P}-CVE-2017-2616.patch #610804
+)
+
+src_prepare() {
+	epatch "${PATCHES[@]}"
+	epatch_user
+	#eautoreconf
+	elibtoolize
+}
+
+src_configure() {
+	econf \
+		--without-group-name-max-length \
+		--without-tcb \
+		--enable-shared=no \
+		--enable-static=yes \
+		$(use_with acl) \
+		$(use_with audit) \
+		$(use_with cracklib libcrack) \
+		$(use_with pam libpam) \
+		$(use_with skey) \
+		$(use_with selinux) \
+		$(use_enable nls) \
+		$(use_with elibc_glibc nscd) \
+		$(use_with xattr attr)
+	has_version 'sys-libs/uclibc[-rpc]' && sed -i '/RLOGIN/d' config.h #425052
+
+	if use nls ; then
+		local l langs="po" # These are the pot files.
+		for l in ${LANGS[*]} ; do
+			use linguas_${l} && langs+=" ${l}"
+		done
+		sed -i "/^SUBDIRS = /s:=.*:= ${langs}:" man/Makefile || die
+	fi
+}
+
+set_login_opt() {
+	local comment="" opt=$1 val=$2
+	if [[ -z ${val} ]]; then
+		comment="#"
+		sed -i \
+			-e "/^${opt}\>/s:^:#:" \
+			"${ED}"/etc/login.defs || die
+	else
+		sed -i -r \
+			-e "/^#?${opt}\>/s:.*:${opt} ${val}:" \
+			"${ED}"/etc/login.defs
+	fi
+	local res=$(grep "^${comment}${opt}\>" "${ED}"/etc/login.defs)
+	einfo "${res:-Unable to find ${opt} in /etc/login.defs}"
+}
+
+src_install() {
+	emake DESTDIR="${D}" suidperms=4711 install
+
+	# Remove libshadow and libmisc; see bug 37725 and the following
+	# comment from shadow's README.linux:
+	#   Currently, libshadow.a is for internal use only, so if you see
+	#   -lshadow in a Makefile of some other package, it is safe to
+	#   remove it.
+	rm -f "${ED}"/{,usr/}$(get_libdir)/lib{misc,shadow}.{a,la}
+
+	insinto /etc
+	if ! use pam ; then
+		insopts -m0600
+		doins etc/login.access etc/limits
+	fi
+
+	# needed for 'useradd -D'
+	insinto /etc/default
+	insopts -m0600
+	doins "${FILESDIR}"/default/useradd
+
+	# move passwd to / to help recover broke systems #64441
+	mv "${ED}"/usr/bin/passwd "${ED}"/bin/ || die
+	dosym /bin/passwd /usr/bin/passwd
+
+	cd "${S}"
+	insinto /etc
+	insopts -m0644
+	newins etc/login.defs login.defs
+
+	set_login_opt CREATE_HOME yes
+	if ! use pam ; then
+		set_login_opt MAIL_CHECK_ENAB no
+		set_login_opt SU_WHEEL_ONLY yes
+		set_login_opt CRACKLIB_DICTPATH /usr/$(get_libdir)/cracklib_dict
+		set_login_opt LOGIN_RETRIES 3
+		set_login_opt ENCRYPT_METHOD SHA512
+		set_login_opt CONSOLE
+	else
+		dopamd "${FILESDIR}"/pam.d-include/shadow
+
+		for x in chpasswd chgpasswd newusers; do
+			newpamd "${FILESDIR}"/pam.d-include/passwd ${x}
+		done
+
+		for x in chage chsh chfn \
+				 user{add,del,mod} group{add,del,mod} ; do
+			newpamd "${FILESDIR}"/pam.d-include/shadow ${x}
+		done
+
+		# comment out login.defs options that pam hates
+		local opt sed_args=()
+		for opt in \
+			CHFN_AUTH \
+			CONSOLE \
+			CRACKLIB_DICTPATH \
+			ENV_HZ \
+			ENVIRON_FILE \
+			FAILLOG_ENAB \
+			FTMP_FILE \
+			LASTLOG_ENAB \
+			MAIL_CHECK_ENAB \
+			MOTD_FILE \
+			NOLOGINS_FILE \
+			OBSCURE_CHECKS_ENAB \
+			PASS_ALWAYS_WARN \
+			PASS_CHANGE_TRIES \
+			PASS_MIN_LEN \
+			PORTTIME_CHECKS_ENAB \
+			QUOTAS_ENAB \
+			SU_WHEEL_ONLY
+		do
+			set_login_opt ${opt}
+			sed_args+=( -e "/^#${opt}\>/b pamnote" )
+		done
+		sed -i "${sed_args[@]}" \
+			-e 'b exit' \
+			-e ': pamnote; i# NOTE: This setting should be configured via /etc/pam.d/ and not in this file.' \
+			-e ': exit' \
+			"${ED}"/etc/login.defs || die
+
+		# remove manpages that pam will install for us
+		# and/or don't apply when using pam
+		find "${ED}"/usr/share/man \
+			'(' -name 'limits.5*' -o -name 'suauth.5*' ')' \
+			-delete
+
+		# Remove pam.d files provided by pambase.
+		rm "${ED}"/etc/pam.d/{login,passwd,su} || die
+	fi
+
+	# Remove manpages that are handled by other packages
+	find "${ED}"/usr/share/man \
+		'(' -name id.1 -o -name passwd.5 -o -name getspnam.3 ')' \
+		-delete
+
+	cd "${S}"
+	dodoc ChangeLog NEWS TODO
+	newdoc README README.download
+	cd doc
+	dodoc HOWTO README* WISHLIST *.txt
+}
+
+pkg_preinst() {
+	rm -f "${EROOT}"/etc/pam.d/system-auth.new \
+		"${EROOT}/etc/login.defs.new"
+}
+
+pkg_postinst() {
+	# Enable shadow groups.
+	if [ ! -f "${EROOT}"/etc/gshadow ] ; then
+		if grpck -r -R "${EROOT}" 2>/dev/null ; then
+			grpconv -R "${EROOT}"
+		else
+			ewarn "Running 'grpck' returned errors.  Please run it by hand, and then"
+			ewarn "run 'grpconv' afterwards!"
+		fi
+	fi
+
+	einfo "The 'adduser' symlink to 'useradd' has been dropped."
+}