[OE-core] [PATCH] openssh: Fix key generation with systemd
Joshua Watt
jpewhacker at gmail.com
Thu Jun 29 12:30:22 UTC 2017
106b59d9 broke SSH host key generation when systemd and a read-only root file
system are in use because there isn't a way for systemd to get the optional
weak assigment of SYSCONFDIR from /etc/default/sshd and still provide a default
value if it is not specified. Instead, move the logic for determining if keys
need to be created to a helper script that both the SysV init script and the
systemd unit file can reference.
This does mean that the systemd unit file can't check for file existence to
know if it should start the service, but it wasn't able to do that correctly
anyway anymore. This should be a problem since the serivce is only run once per
power cycle by systemd, and should exit quickly if the keys already exist
Signed-off-by: Joshua Watt <JPEWhacker at gmail.com>
---
meta/recipes-connectivity/openssh/openssh/init | 69 +---------------------
.../openssh/openssh/sshd_check_keys | 64 ++++++++++++++++++++
.../openssh/openssh/sshdgenkeys.service | 16 +----
meta/recipes-connectivity/openssh/openssh_7.5p1.bb | 7 +++
4 files changed, 75 insertions(+), 81 deletions(-)
create mode 100644 meta/recipes-connectivity/openssh/openssh/sshd_check_keys
diff --git a/meta/recipes-connectivity/openssh/openssh/init b/meta/recipes-connectivity/openssh/openssh/init
index 386628a..34ba0f8 100644
--- a/meta/recipes-connectivity/openssh/openssh/init
+++ b/meta/recipes-connectivity/openssh/openssh/init
@@ -19,25 +19,6 @@ fi
[ -z "$SYSCONFDIR" ] && SYSCONFDIR=/etc/ssh
mkdir -p $SYSCONFDIR
-parse_sshd_opts() {
- set -- ${SSHD_OPTS} --
- sshd_config=/etc/ssh/sshd_config
- while true ; do
- case "$1" in
- -f*) if [ "$1" = "-f" ] ; then
- sshd_config="$2"
- shift
- else
- sshd_config="${1#-f}"
- fi
- shift
- ;;
- --) shift; break;;
- *) shift;;
- esac
- done
-}
-
check_for_no_start() {
# forget it if we're trying to start, and /etc/ssh/sshd_not_to_be_run exists
if [ -e $SYSCONFDIR/sshd_not_to_be_run ]; then
@@ -58,57 +39,13 @@ check_config() {
/usr/sbin/sshd -t $SSHD_OPTS || exit 1
}
-check_keys() {
- # parse location of keys
- local HOST_KEY_RSA
- local HOST_KEY_DSA
- local HOST_KEY_ECDSA
- local HOST_KEY_ED25519
-
- parse_sshd_opts
- HOST_KEY_RSA=$(grep ^HostKey "${sshd_config}" | grep _rsa_ | tail -1 | awk ' { print $2 } ')
- [ -z "${HOST_KEY_RSA}" ] && HOST_KEY_RSA=$(grep HostKey "${sshd_config}" | grep _rsa_ | tail -1 | awk ' { print $2 } ')
- [ -z "${HOST_KEY_RSA}" ] && HOST_KEY_RSA=$SYSCONFDIR/ssh_host_rsa_key
- HOST_KEY_DSA=$(grep ^HostKey "${sshd_config}" | grep _dsa_ | tail -1 | awk ' { print $2 } ')
- [ -z "${HOST_KEY_DSA}" ] && HOST_KEY_DSA=$(grep HostKey "${sshd_config}" | grep _dsa_ | tail -1 | awk ' { print $2 } ')
- [ -z "${HOST_KEY_DSA}" ] && HOST_KEY_DSA=$SYSCONFDIR/ssh_host_dsa_key
- HOST_KEY_ECDSA=$(grep ^HostKey "${sshd_config}" | grep _ecdsa_ | tail -1 | awk ' { print $2 } ')
- [ -z "${HOST_KEY_ECDSA}" ] && HOST_KEY_ECDSA=$(grep HostKey "${sshd_config}" | grep _ecdsa_ | tail -1 | awk ' { print $2 } ')
- [ -z "${HOST_KEY_ECDSA}" ] && HOST_KEY_ECDSA=$SYSCONFDIR/ssh_host_ecdsa_key
- HOST_KEY_ED25519=$(grep ^HostKey "${sshd_config}" | grep _ed25519_ | tail -1 | awk ' { print $2 } ')
- [ -z "${HOST_KEY_ED25519}" ] && HOST_KEY_ED25519=$(grep HostKey "${sshd_config}" | grep _ed25519_ | tail -1 | awk ' { print $2 } ')
- [ -z "${HOST_KEY_ED25519}" ] && HOST_KEY_ED25519=$SYSCONFDIR/ssh_host_ed25519_key
-
- # create keys if necessary
- if [ ! -f $HOST_KEY_RSA ]; then
- echo " generating ssh RSA key..."
- mkdir -p $(dirname $HOST_KEY_RSA)
- ssh-keygen -q -f $HOST_KEY_RSA -N '' -t rsa
- fi
- if [ ! -f $HOST_KEY_ECDSA ]; then
- echo " generating ssh ECDSA key..."
- mkdir -p $(dirname $HOST_KEY_ECDSA)
- ssh-keygen -q -f $HOST_KEY_ECDSA -N '' -t ecdsa
- fi
- if [ ! -f $HOST_KEY_DSA ]; then
- echo " generating ssh DSA key..."
- mkdir -p $(dirname $HOST_KEY_DSA)
- ssh-keygen -q -f $HOST_KEY_DSA -N '' -t dsa
- fi
- if [ ! -f $HOST_KEY_ED25519 ]; then
- echo " generating ssh ED25519 key..."
- mkdir -p $(dirname $HOST_KEY_ED25519)
- ssh-keygen -q -f $HOST_KEY_ED25519 -N '' -t ed25519
- fi
-}
-
export PATH="${PATH:+$PATH:}/usr/sbin:/sbin"
case "$1" in
start)
check_for_no_start
echo "Starting OpenBSD Secure Shell server: sshd"
- check_keys
+ @LIBEXECDIR@/sshd_check_keys
check_privsep_dir
start-stop-daemon -S -p $PIDFILE -x /usr/sbin/sshd -- $SSHD_OPTS
echo "done."
@@ -121,7 +58,7 @@ case "$1" in
reload|force-reload)
check_for_no_start
- check_keys
+ @LIBEXECDIR@/sshd_check_keys
check_config
echo -n "Reloading OpenBSD Secure Shell server's configuration"
start-stop-daemon -K -p $PIDFILE -s 1 -x /usr/sbin/sshd
@@ -129,7 +66,7 @@ case "$1" in
;;
restart)
- check_keys
+ @LIBEXECDIR@/sshd_check_keys
check_config
echo -n "Restarting OpenBSD Secure Shell server: sshd"
start-stop-daemon -K -p $PIDFILE --oknodo -x /usr/sbin/sshd
diff --git a/meta/recipes-connectivity/openssh/openssh/sshd_check_keys b/meta/recipes-connectivity/openssh/openssh/sshd_check_keys
new file mode 100644
index 0000000..f5bba53
--- /dev/null
+++ b/meta/recipes-connectivity/openssh/openssh/sshd_check_keys
@@ -0,0 +1,64 @@
+#! /bin/sh
+
+# /etc/default/ssh may set SYSCONFDIR and SSHD_OPTS
+if test -f /etc/default/ssh; then
+ . /etc/default/ssh
+fi
+
+[ -z "$SYSCONFDIR" ] && SYSCONFDIR=/etc/ssh
+mkdir -p $SYSCONFDIR
+
+# parse sshd options
+set -- ${SSHD_OPTS} --
+sshd_config=/etc/ssh/sshd_config
+while true ; do
+ case "$1" in
+ -f*) if [ "$1" = "-f" ] ; then
+ sshd_config="$2"
+ shift
+ else
+ sshd_config="${1#-f}"
+ fi
+ shift
+ ;;
+ --) shift; break;;
+ *) shift;;
+ esac
+done
+
+# parse location of keys
+HOST_KEY_RSA=$(grep ^HostKey "${sshd_config}" | grep _rsa_ | tail -1 | awk ' { print $2 } ')
+[ -z "${HOST_KEY_RSA}" ] && HOST_KEY_RSA=$(grep HostKey "${sshd_config}" | grep _rsa_ | tail -1 | awk ' { print $2 } ')
+[ -z "${HOST_KEY_RSA}" ] && HOST_KEY_RSA=$SYSCONFDIR/ssh_host_rsa_key
+HOST_KEY_DSA=$(grep ^HostKey "${sshd_config}" | grep _dsa_ | tail -1 | awk ' { print $2 } ')
+[ -z "${HOST_KEY_DSA}" ] && HOST_KEY_DSA=$(grep HostKey "${sshd_config}" | grep _dsa_ | tail -1 | awk ' { print $2 } ')
+[ -z "${HOST_KEY_DSA}" ] && HOST_KEY_DSA=$SYSCONFDIR/ssh_host_dsa_key
+HOST_KEY_ECDSA=$(grep ^HostKey "${sshd_config}" | grep _ecdsa_ | tail -1 | awk ' { print $2 } ')
+[ -z "${HOST_KEY_ECDSA}" ] && HOST_KEY_ECDSA=$(grep HostKey "${sshd_config}" | grep _ecdsa_ | tail -1 | awk ' { print $2 } ')
+[ -z "${HOST_KEY_ECDSA}" ] && HOST_KEY_ECDSA=$SYSCONFDIR/ssh_host_ecdsa_key
+HOST_KEY_ED25519=$(grep ^HostKey "${sshd_config}" | grep _ed25519_ | tail -1 | awk ' { print $2 } ')
+[ -z "${HOST_KEY_ED25519}" ] && HOST_KEY_ED25519=$(grep HostKey "${sshd_config}" | grep _ed25519_ | tail -1 | awk ' { print $2 } ')
+[ -z "${HOST_KEY_ED25519}" ] && HOST_KEY_ED25519=$SYSCONFDIR/ssh_host_ed25519_key
+
+# create keys if necessary
+if [ ! -f $HOST_KEY_RSA ]; then
+ echo " generating ssh RSA key..."
+ mkdir -p $(dirname $HOST_KEY_RSA)
+ ssh-keygen -q -f $HOST_KEY_RSA -N '' -t rsa
+fi
+if [ ! -f $HOST_KEY_ECDSA ]; then
+ echo " generating ssh ECDSA key..."
+ mkdir -p $(dirname $HOST_KEY_ECDSA)
+ ssh-keygen -q -f $HOST_KEY_ECDSA -N '' -t ecdsa
+fi
+if [ ! -f $HOST_KEY_DSA ]; then
+ echo " generating ssh DSA key..."
+ mkdir -p $(dirname $HOST_KEY_DSA)
+ ssh-keygen -q -f $HOST_KEY_DSA -N '' -t dsa
+fi
+if [ ! -f $HOST_KEY_ED25519 ]; then
+ echo " generating ssh ED25519 key..."
+ mkdir -p $(dirname $HOST_KEY_ED25519)
+ ssh-keygen -q -f $HOST_KEY_ED25519 -N '' -t ed25519
+fi
+
diff --git a/meta/recipes-connectivity/openssh/openssh/sshdgenkeys.service b/meta/recipes-connectivity/openssh/openssh/sshdgenkeys.service
index 148e6ad..603c337 100644
--- a/meta/recipes-connectivity/openssh/openssh/sshdgenkeys.service
+++ b/meta/recipes-connectivity/openssh/openssh/sshdgenkeys.service
@@ -1,22 +1,8 @@
[Unit]
Description=OpenSSH Key Generation
RequiresMountsFor=/var /run
-ConditionPathExists=!/var/run/ssh/ssh_host_rsa_key
-ConditionPathExists=!/var/run/ssh/ssh_host_dsa_key
-ConditionPathExists=!/var/run/ssh/ssh_host_ecdsa_key
-ConditionPathExists=!/var/run/ssh/ssh_host_ed25519_key
-ConditionPathExists=!/etc/ssh/ssh_host_rsa_key
-ConditionPathExists=!/etc/ssh/ssh_host_dsa_key
-ConditionPathExists=!/etc/ssh/ssh_host_ecdsa_key
-ConditionPathExists=!/etc/ssh/ssh_host_ed25519_key
[Service]
-Environment="SYSCONFDIR=/etc/ssh"
-EnvironmentFile=-/etc/default/ssh
-ExecStart=@BASE_BINDIR@/mkdir -p $SYSCONFDIR
-ExecStart=@BINDIR@/ssh-keygen -q -f ${SYSCONFDIR}/ssh_host_rsa_key -N '' -t rsa
-ExecStart=@BINDIR@/ssh-keygen -q -f ${SYSCONFDIR}/ssh_host_dsa_key -N '' -t dsa
-ExecStart=@BINDIR@/ssh-keygen -q -f ${SYSCONFDIR}/ssh_host_ecdsa_key -N '' -t ecdsa
-ExecStart=@BINDIR@/ssh-keygen -q -f ${SYSCONFDIR}/ssh_host_ed25519_key -N '' -t ed25519
+ExecStart=@LIBEXECDIR@/sshd_check_keys
Type=oneshot
RemainAfterExit=yes
diff --git a/meta/recipes-connectivity/openssh/openssh_7.5p1.bb b/meta/recipes-connectivity/openssh/openssh_7.5p1.bb
index 7bd313b..dd65642 100644
--- a/meta/recipes-connectivity/openssh/openssh_7.5p1.bb
+++ b/meta/recipes-connectivity/openssh/openssh_7.5p1.bb
@@ -25,6 +25,7 @@ SRC_URI = "http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-${PV}.tar
file://openssh-7.1p1-conditional-compile-des-in-cipher.patch \
file://openssh-7.1p1-conditional-compile-des-in-pkcs11.patch \
file://fix-potential-signed-overflow-in-pointer-arithmatic.patch \
+ file://sshd_check_keys \
"
PAM_SRC_URI = "file://sshd"
@@ -118,7 +119,13 @@ do_install_append () {
sed -i -e 's, at BASE_BINDIR@,${base_bindir},g' \
-e 's, at SBINDIR@,${sbindir},g' \
-e 's, at BINDIR@,${bindir},g' \
+ -e 's, at LIBEXECDIR@,${libexecdir}/${BPN},g' \
${D}${systemd_unitdir}/system/sshd.socket ${D}${systemd_unitdir}/system/*.service
+
+ sed -i -e 's, at LIBEXECDIR@,${libexecdir}/${BPN},g' \
+ ${D}${sysconfdir}/init.d/sshd
+
+ install -D -m 0755 ${WORKDIR}/sshd_check_keys ${D}${libexecdir}/${BPN}/sshd_check_keys
}
do_install_ptest () {
--
2.9.4
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