znc: run as user znc & use procd
Create & run znc as a specific user rather than nobody. Converted to use procd, removing dependencies on znc's 'droproot' module & 'su' Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
This commit is contained in:
Kevin Darbyshire-Bryant
parent
b791b2aa9c
commit
a6715c17ff
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@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
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PKG_NAME:=znc
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PKG_VERSION:=1.6.3
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PKG_RELEASE:=3
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PKG_RELEASE:=4
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PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
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PKG_SOURCE_URL:=http://znc.in/releases \
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@ -31,6 +31,7 @@ define Package/znc/default
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CATEGORY:=Network
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TITLE:=ZNC
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URL:=http://en.znc.in/
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USERID:=znc:znc
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endef
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define Package/znc
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@ -62,12 +63,11 @@ define Package/znc/install
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$(INSTALL_DIR) $(1)/etc/config
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$(INSTALL_DATA) ./files/znc.conf $(1)/etc/config/znc
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$(INSTALL_DIR) $(1)/usr/lib/znc/
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$(INSTALL_BIN) $(PKG_BUILD_DIR)/modules/droproot.so $(1)/usr/lib/znc/
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endef
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ZNC_MODULES :=
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ZNC_MODULE_TARGETS := droproot.so
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ZNC_MODULE_TARGETS :=
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define module
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define Package/znc-mod-$(strip $(1))
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@ -3,6 +3,8 @@
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START=60
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USE_PROCD=1
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ZNC_CONFIG_PATH=/tmp/etc/znc
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PID_FILE=${ZNC_CONFIG_PATH}/znc.pid
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ZNC_CONFIG=${ZNC_CONFIG_PATH}/configs/znc.conf
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@ -12,7 +14,6 @@ DISABLED=
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RUNAS_USER=
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RUNAS_GROUP=
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RUNAS_SHELL=
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add_param() {
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echo "$1 = $2" >> $ZNC_CONFIG
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@ -59,9 +60,8 @@ znc_global() {
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config_get znc_config_path "$znc" znc_config_path
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config_get RUNAS_USER "$znc" runas_user
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config_get RUNAS_GROUP "$znc" runas_group
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config_get RUNAS_SHELL "$znc" runas_shell
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config_get RUNAS_USER "$znc" runas_user znc
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config_get RUNAS_GROUP "$znc" runas_group znc
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if [ "${znc_config_path}" ]
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then
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@ -90,8 +90,6 @@ znc_global() {
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config_list_foreach "$znc" listener "add_param Listener"
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config_list_foreach "$znc" module "add_param LoadModule"
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add_param LoadModule "droproot ${RUNAS_USER:-nobody} ${RUNAS_GROUP:-nogroup}"
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fi
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}
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@ -156,45 +154,30 @@ add_user() {
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echo "</User>" >> $ZNC_CONFIG
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}
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start() {
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start_service() {
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config_load znc
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config_foreach znc_global znc
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if [ "$DISABLED" -eq 1 ]; then
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return 0
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fi
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[ "$DISABLED" -eq 0 ] || return 0
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if [ "$EXTERNAL_CONFIG" -eq 0 ]
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then
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config_foreach add_listener listener
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config_foreach add_user user
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chown -hR ${RUNAS_USER:-nobody}:${RUNAS_GROUP:-nogroup} ${ZNC_CONFIG_PATH}
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fi
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if [ "$EXTERNAL_CONFIG" -eq 1 -a "$RUNAS_USER" ]
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then
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local SU=$(which su)
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if [ "$SU" ]
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then
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chown -hR ${RUNAS_USER:-nobody}:${RUNAS_GROUP:-nogroup} ${ZNC_CONFIG_PATH}
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$SU ${RUNAS_SHELL:+s $RUNAS_SHELL} -c "/usr/bin/znc -d$ZNC_CONFIG_PATH >/dev/null &" $RUNAS_USER
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else
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logger -s -t ZNC -p daemon.err "Could not run ZNC as user $RUNAS_USER: su not found."
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exit 1
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fi
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else
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/usr/bin/znc -d$ZNC_CONFIG_PATH >/dev/null &
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fi
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chown -hR ${RUNAS_USER}:${RUNAS_GROUP} ${ZNC_CONFIG_PATH} || {
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logger -s -t ZNC -p daemon.err "Invalid UID/GID. Aborting startup"
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exit 1
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}
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procd_open_instance
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procd_set_param file /etc/config/znc
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[ "$EXTERNAL_CONFIG" -eq 1 ] && procd_set_param file "${ZNC_CONFIG}/configs/znc.conf"
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procd_set_param command /usr/bin/znc
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procd_append_param command -f -d$ZNC_CONFIG_PATH
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procd_set_param user ${RUNAS_USER}
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procd_set_param respawn
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procd_close_instance
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}
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stop() {
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if [ -f "$PID_FILE" ]
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then
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kill $(cat "$PID_FILE")
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else
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killall znc
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fi
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}
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@ -1,147 +0,0 @@
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--- /dev/null
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+++ b/modules/droproot.cpp
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@@ -0,0 +1,144 @@
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+/*
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+ * droproot.cpp
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+ *
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+ * Copyright (c) 2009 Vadtec (vadtec@vadtec.net)
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2004-2012 See the AUTHORS file for details.
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ */
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+
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+#include <znc/znc.h>
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+#include <znc/User.h>
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+#include <pwd.h>
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+#include <grp.h>
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+
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+class CDroproot : public CModule {
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+
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+public:
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+ MODCONSTRUCTOR(CDroproot) {
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+ }
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+
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+ virtual ~CDroproot() {
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+ }
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+
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+ uid_t GetUser(const CString& sUser, CString& sMessage) {
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+ uid_t ret = sUser.ToUInt();
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+
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+ if (ret != 0)
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+ return ret;
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+
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+ struct passwd *pUser = getpwnam(sUser.c_str());
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+
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+ if (!pUser) {
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+ sMessage = "User [" + sUser + "] not found!";
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+ return 0;
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+ }
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+
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+ return pUser->pw_uid;
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+ }
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+
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+ gid_t GetGroup(const CString& sGroup, CString& sMessage) {
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+ gid_t ret = sGroup.ToUInt();
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+
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+ if (ret != 0)
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+ return ret;
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+
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+ struct group *pGroup = getgrnam(sGroup.c_str());
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+
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+ if (!pGroup) {
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+ sMessage = "Group [" + sGroup + "] not found!";
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+ return 0;
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+ }
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+
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+ return pGroup->gr_gid;
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+ }
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+
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+ virtual bool OnLoad(const CString& sArgs, CString& sMessage) {
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+ CString sUser = sArgs.Token(0);
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+ CString sGroup = sArgs.Token(1, true);
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+
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+ if (sUser.empty() || sGroup.empty()) {
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+ sMessage = "Usage: LoadModule = Droproot <uid> <gid>";
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+ return false;
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+ }
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+
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+ m_user = GetUser(sUser, sMessage);
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+
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+ if (m_user == 0) {
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+ sMessage
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+ = "Error: Cannot run as root, check your config file | Usage: LoadModule = Droproot <uid> <gid>";
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+ return false;
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+ }
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+
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+ m_group = GetGroup(sGroup, sMessage);
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+
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+ if (m_group == 0) {
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+ sMessage
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+ = "Error: Cannot run as root, check your config file | Usage: LoadModule = Droproot <uid> <gid>";
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+ return false;
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+ }
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+
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+ return true;
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+ }
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+
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+ virtual bool OnBoot() {
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+ int u, eu, g, eg, sg;
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+
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+ if ((geteuid() == 0) || (getuid() == 0) || (getegid() == 0) || (getgid()
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+ == 0)) {
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+
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+ CUtils::PrintAction("Dropping root permissions");
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+
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+ // Clear all the supplementary groups
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+ sg = setgroups(0, NULL);
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+
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+ if (sg < 0) {
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+ CUtils::PrintStatus(false,
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+ "Could not remove supplementary groups! ["
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+ + CString(strerror(errno)) + "]");
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+
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+ return false;
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+ }
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+
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+ // Set the group (if we are root, this sets all three group IDs)
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+ g = setgid(m_group);
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+ eg = setegid(m_group);
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+
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+ if ((g < 0) || (eg < 0)) {
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+ CUtils::PrintStatus(false, "Could not switch group id! ["
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+ + CString(strerror(errno)) + "]");
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+
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+ return false;
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+ }
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+
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+ // and set the user (if we are root, this sets all three user IDs)
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+ u = setuid(m_user);
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+ eu = seteuid(m_user);
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+
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+ if ((u < 0) || (eu < 0)) {
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+ CUtils::PrintStatus(false, "Could not switch user id! ["
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+ + CString(strerror(errno)) + "]");
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+
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+ return false;
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+ }
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+
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+ CUtils::PrintStatus(true);
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+
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+ return true;
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+ }
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+
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+ return true;
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+ }
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+
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+protected:
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+ uid_t m_user;
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+ gid_t m_group;
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+};
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+
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+GLOBALMODULEDEFS(CDroproot, "Allows ZNC to drop root privileges and run as an un-privileged user.")
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