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[84.114.45.16]) by smtp.gmail.com with ESMTPSA id e8sm6030838edk.42.2020.06.05.15.59.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Jun 2020 15:59:43 -0700 (PDT) From: Norbert Lange To: buildroot@buildroot.org Date: Sat, 6 Jun 2020 00:59:02 +0200 Message-Id: <20200605225905.14082-2-nolange79@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200605225905.14082-1-nolange79@gmail.com> References: <20200605225905.14082-1-nolange79@gmail.com> MIME-Version: 1.0 Subject: [Buildroot] [PATCH 2/4] package/openssh: improve integration for systemd X-BeenThere: buildroot@busybox.net X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion and development of buildroot List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Norbert Lange Errors-To: buildroot-bounces@busybox.net Sender: "buildroot" the openssh daemon is not suited for systemd's simple service type. dependend services should only start when sshd is ready to accept connections. A patch is added from debian to allow openssh to communicate this state. Restarts are prevented if the reason is a faulty config file (errocode 255). The "user confinement directory" is changed to '/run/sshd' which is automatically managed by systemd. Signed-off-by: Norbert Lange --- package/openssh/00-systemd-readiness.patch | 84 ++++++++++++++++++++++ package/openssh/openssh.mk | 14 +++- package/openssh/sshd-sysusers.conf | 2 +- package/openssh/sshd.service | 13 +++- 4 files changed, 109 insertions(+), 4 deletions(-) create mode 100644 package/openssh/00-systemd-readiness.patch diff --git a/package/openssh/00-systemd-readiness.patch b/package/openssh/00-systemd-readiness.patch new file mode 100644 index 0000000000..be3b6b0074 --- /dev/null +++ b/package/openssh/00-systemd-readiness.patch @@ -0,0 +1,84 @@ +From ab765b2bd55062a704f09da8f8c1c4ad1d6630a7 Mon Sep 17 00:00:00 2001 +From: Michael Biebl +Date: Mon, 21 Dec 2015 16:08:47 +0000 +Subject: Add systemd readiness notification support + +Bug-Debian: https://bugs.debian.org/778913 +Forwarded: no +Last-Update: 2017-08-22 + +Patch-Name: systemd-readiness.patch +--- + configure.ac | 24 ++++++++++++++++++++++++ + sshd.c | 9 +++++++++ + 2 files changed, 33 insertions(+) + +diff --git a/configure.ac b/configure.ac +index e894db9fc..c119d6fd1 100644 +--- a/configure.ac ++++ b/configure.ac +@@ -4499,6 +4499,29 @@ AC_ARG_WITH([kerberos5], + AC_SUBST([GSSLIBS]) + AC_SUBST([K5LIBS]) + ++# Check whether user wants systemd support ++SYSTEMD_MSG="no" ++AC_ARG_WITH(systemd, ++ [ --with-systemd Enable systemd support], ++ [ if test "x$withval" != "xno" ; then ++ AC_PATH_TOOL([PKGCONFIG], [pkg-config], [no]) ++ if test "$PKGCONFIG" != "no"; then ++ AC_MSG_CHECKING([for libsystemd]) ++ if $PKGCONFIG --exists libsystemd; then ++ SYSTEMD_CFLAGS=`$PKGCONFIG --cflags libsystemd` ++ SYSTEMD_LIBS=`$PKGCONFIG --libs libsystemd` ++ CPPFLAGS="$CPPFLAGS $SYSTEMD_CFLAGS" ++ SSHDLIBS="$SSHDLIBS $SYSTEMD_LIBS" ++ AC_MSG_RESULT([yes]) ++ AC_DEFINE(HAVE_SYSTEMD, 1, [Define if you want systemd support.]) ++ SYSTEMD_MSG="yes" ++ else ++ AC_MSG_RESULT([no]) ++ fi ++ fi ++ fi ] ++) ++ + # Looking for programs, paths and files + + PRIVSEP_PATH=/var/empty +@@ -5305,6 +5328,7 @@ echo " libldns support: $LDNS_MSG" + echo " Solaris process contract support: $SPC_MSG" + echo " Solaris project support: $SP_MSG" + echo " Solaris privilege support: $SPP_MSG" ++echo " systemd support: $SYSTEMD_MSG" + echo " IP address in \$DISPLAY hack: $DISPLAY_HACK_MSG" + echo " Translate v4 in v6 hack: $IPV4_IN6_HACK_MSG" + echo " BSD Auth support: $BSD_AUTH_MSG" +diff --git a/sshd.c b/sshd.c +index 4e8ff0662..5e7679a33 100644 +--- a/sshd.c ++++ b/sshd.c +@@ -85,6 +85,10 @@ + #include + #endif + ++#ifdef HAVE_SYSTEMD ++#include ++#endif ++ + #include "xmalloc.h" + #include "ssh.h" + #include "ssh2.h" +@@ -1951,6 +1955,11 @@ main(int ac, char **av) + } + } + ++#ifdef HAVE_SYSTEMD ++ /* Signal systemd that we are ready to accept connections */ ++ sd_notify(0, "READY=1"); ++#endif ++ + /* Accept a connection and return in a forked child */ + server_accept_loop(&sock_in, &sock_out, + &newsock, config_s); diff --git a/package/openssh/openssh.mk b/package/openssh/openssh.mk index 55b917e20a..d425db1428 100644 --- a/package/openssh/openssh.mk +++ b/package/openssh/openssh.mk @@ -12,6 +12,7 @@ OPENSSH_CONF_ENV = \ LD="$(TARGET_CC)" \ LDFLAGS="$(TARGET_CFLAGS)" \ LIBS=`$(PKG_CONFIG_HOST_BINARY) --libs openssl` +OPENSSH_AUTORECONF = YES OPENSSH_CONF_OPTS = \ --sysconfdir=/etc/ssh \ --with-default-path=$(BR2_SYSTEM_DEFAULT_PATH) \ @@ -22,9 +23,20 @@ OPENSSH_CONF_OPTS = \ --disable-wtmpx \ --disable-strip +ifeq ($(BR2_PACKAGE_SYSTEMD),y) +OPENSSH_DEPENDENCIES = systemd + +OPENSSH_CONF_OPTS += \ + --with-privsep-path=/run/sshd \ + --with-pid-dir=/run \ + --with-systemd + +else + define OPENSSH_PERMISSIONS /var/empty d 755 root root - - - - - endef +endif ifeq ($(BR2_TOOLCHAIN_SUPPORTS_PIE),) OPENSSH_CONF_OPTS += --without-pie @@ -72,7 +84,7 @@ define OPENSSH_INSTALL_SYSTEMD_SYSUSERS endef else define OPENSSH_USERS - sshd -1 sshd -1 * /var/empty - - SSH drop priv user + sshd -1 sshd -1 * $(if $(BR2_PACKAGE_SYSTEMD),/run/sshd,/var/empty) - - SSH drop priv user endef endif diff --git a/package/openssh/sshd-sysusers.conf b/package/openssh/sshd-sysusers.conf index ac77aec065..303d0dbb63 100644 --- a/package/openssh/sshd-sysusers.conf +++ b/package/openssh/sshd-sysusers.conf @@ -1 +1 @@ -u sshd - "SSH drop priv user" /var/empty +u sshd - "SSH drop priv user" /run/sshd diff --git a/package/openssh/sshd.service b/package/openssh/sshd.service index b5e96b3a25..715bd3f7eb 100644 --- a/package/openssh/sshd.service +++ b/package/openssh/sshd.service @@ -1,11 +1,20 @@ [Unit] Description=OpenSSH server daemon -After=syslog.target network.target auditd.service +Documentation=man:sshd(8) man:sshd_config(5) +After=network.target auditd.service [Service] ExecStartPre=/usr/bin/ssh-keygen -A -ExecStart=/usr/sbin/sshd -D -e +ExecStartPre=/usr/sbin/sshd -t +ExecStart=/usr/sbin/sshd -D +ExecReload=/usr/sbin/sshd -t ExecReload=/bin/kill -HUP $MAINPID +KillMode=process +Restart=on-failure +RestartPreventExitStatus=255 +Type=notify +RuntimeDirectory=sshd +RuntimeDirectoryMode=0755 [Install] WantedBy=multi-user.target