我在使用 CentOS 8 的主机上有一个运行 spring boot 应用程序的 tomcat 服务器，该服务器使用 SMTP 连接到邮件客户端。问题是它在使用 STARTTLS 选项进行 TLS 握手之前突然关闭连接。它可以与运行 CentOS 7 和 Oracle Linux 服务器的其他节点正常工作。问题不可能出在应用程序上，否则它在任何节点上都无法工作。我使用 Wireshark 检查发现是我们的应用程序节点终止了连接。这是我使用 tcpdump 记录的 TCP 通信记录。
220 mta1.***.local ESMTP Postfix
EHLO ****
250-mta1.***.local
250-PIPELINING
250-SIZE 69730304
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
STARTTLS
220 2.0.0 Ready to start TLS
之后就什么都没有了。连接突然终止，没有超时或类似情况。我还检查了 server.xml 文件中是否存在任何设置，其中没有以任何方式提及邮件或 smtp。
我尝试使用 openssl 进行同样的操作，成功通过 smtp 连接启动 TLS，因此这不是服务器不支持该选项的问题。有人知道为什么会发生这种情况吗？
openssl s_client -connect smtp.****.gov.**:587 -starttls smtp
我的 catalina.sh 文件
#!/bin/sh
cygwin=false
darwin=false
os400=false
hpux=false
case "`uname`" in
CYGWIN*) cygwin=true;;
Darwin*) darwin=true;;
OS400*) os400=true;;
HP-UX*) hpux=true;;
esac
# resolve links - $0 may be a softlink
PRG="$0"
while [ -h "$PRG" ]; do
ls=`ls -ld "$PRG"`
link=`expr "$ls" : '.*-> \(.*\)$'`
if expr "$link" : '/.*' > /dev/null; then
PRG="$link"
else
PRG=`dirname "$PRG"`/"$link"
fi
done
# Get standard environment variables
PRGDIR=`dirname "$PRG"`
# Only set CATALINA_HOME if not already set
[ -z "$CATALINA_HOME" ] && CATALINA_HOME=`cd "$PRGDIR/.." >/dev/null; pwd`
# Copy CATALINA_BASE from CATALINA_HOME if not already set
[ -z "$CATALINA_BASE" ] && CATALINA_BASE="$CATALINA_HOME"
# Ensure that any user defined CLASSPATH variables are not used on startup,
# but allow them to be specified in setenv.sh, in rare case when it is needed.
CLASSPATH=
if [ -r "$CATALINA_BASE/bin/setenv.sh" ]; then
. "$CATALINA_BASE/bin/setenv.sh"
elif [ -r "$CATALINA_HOME/bin/setenv.sh" ]; then
. "$CATALINA_HOME/bin/setenv.sh"
fi
# For Cygwin, ensure paths are in UNIX format before anything is touched
if $cygwin; then
[ -n "$JAVA_HOME" ] && JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
[ -n "$JRE_HOME" ] && JRE_HOME=`cygpath --unix "$JRE_HOME"`
[ -n "$CATALINA_HOME" ] && CATALINA_HOME=`cygpath --unix "$CATALINA_HOME"`
[ -n "$CATALINA_BASE" ] && CATALINA_BASE=`cygpath --unix "$CATALINA_BASE"`
[ -n "$CLASSPATH" ] && CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
fi
# Ensure that neither CATALINA_HOME nor CATALINA_BASE contains a colon
# as this is used as the separator in the classpath and Java provides no
# mechanism for escaping if the same character appears in the path.
case $CATALINA_HOME in
*:*) echo "Using CATALINA_HOME: $CATALINA_HOME";
echo "Unable to start as CATALINA_HOME contains a colon (:) character";
exit 1;
esac
case $CATALINA_BASE in
*:*) echo "Using CATALINA_BASE: $CATALINA_BASE";
echo "Unable to start as CATALINA_BASE contains a colon (:) character";
exit 1;
esac
# For OS400
if $os400; then
# Set job priority to standard for interactive (interactive - 6) by using
# the interactive priority - 6, the helper threads that respond to requests
# will be running at the same priority as interactive jobs.
COMMAND='chgjob job('$JOBNAME') runpty(6)'
system $COMMAND
# Enable multi threading
export QIBM_MULTI_THREADED=Y
fi
# Get standard Java environment variables
if $os400; then
# -r will Only work on the os400 if the files are:
# 1. owned by the user
# 2. owned by the PRIMARY group of the user
# this will not work if the user belongs in secondary groups
. "$CATALINA_HOME"/bin/setclasspath.sh
else
if [ -r "$CATALINA_HOME"/bin/setclasspath.sh ]; then
. "$CATALINA_HOME"/bin/setclasspath.sh
else
echo "Cannot find $CATALINA_HOME/bin/setclasspath.sh"
echo "This file is needed to run this program"
exit 1
fi
fi
# Add on extra jar files to CLASSPATH
if [ ! -z "$CLASSPATH" ] ; then
CLASSPATH="$CLASSPATH":
fi
CLASSPATH="$CLASSPATH""$CATALINA_HOME"/bin/bootstrap.jar
if [ -z "$CATALINA_OUT" ] ; then
CATALINA_OUT=/home/******/logs/catalinalogs/catalina.out
fi
if [ -z "$CATALINA_TMPDIR" ] ; then
# Define the java.io.tmpdir to use for Catalina
CATALINA_TMPDIR="$CATALINA_BASE"/temp
fi
# Add tomcat-juli.jar to classpath
# tomcat-juli.jar can be over-ridden per instance
if [ -r "$CATALINA_BASE/bin/tomcat-juli.jar" ] ; then
CLASSPATH=$CLASSPATH:$CATALINA_BASE/bin/tomcat-juli.jar
else
CLASSPATH=$CLASSPATH:$CATALINA_HOME/bin/tomcat-juli.jar
fi
# Bugzilla 37848: When no TTY is available, don't output to console
have_tty=0
if [ -t 0 ]; then
have_tty=1
fi
# For Cygwin, switch paths to Windows format before running java
if $cygwin; then
JAVA_HOME=`cygpath --absolute --windows "$JAVA_HOME"`
JRE_HOME=`cygpath --absolute --windows "$JRE_HOME"`
CATALINA_HOME=`cygpath --absolute --windows "$CATALINA_HOME"`
CATALINA_BASE=`cygpath --absolute --windows "$CATALINA_BASE"`
CATALINA_TMPDIR=`cygpath --absolute --windows "$CATALINA_TMPDIR"`
CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
[ -n "$JAVA_ENDORSED_DIRS" ] && JAVA_ENDORSED_DIRS=`cygpath --path --windows "$JAVA_ENDORSED_DIRS"`
fi
if [ -z "$JSSE_OPTS" ] ; then
JSSE_OPTS="-Djdk.tls.ephemeralDHKeySize=2048"
fi
JAVA_OPTS="$JAVA_OPTS $JSSE_OPTS"
# Register custom URL handlers
# Do this here so custom URL handles (specifically 'war:...') can be used in the security policy
JAVA_OPTS="$JAVA_OPTS -Djava.protocol.handler.pkgs=org.apache.catalina.webresources"
# Set juli LogManager config file if it is present and an override has not been issued
if [ -z "$LOGGING_CONFIG" ]; then
if [ -r "$CATALINA_BASE"/conf/logging.properties ]; then
LOGGING_CONFIG="-Djava.util.logging.config.file=$CATALINA_BASE/conf/logging.properties"
else
# Bugzilla 45585
LOGGING_CONFIG="-Dnop"
fi
fi
if [ -z "$LOGGING_MANAGER" ]; then
LOGGING_MANAGER="-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager"
fi
# Set UMASK unless it has been overridden
if [ -z "$UMASK" ]; then
UMASK="0027"
fi
umask $UMASK
# Java 9 no longer supports the java.endorsed.dirs
# system property. Only try to use it if
# JAVA_ENDORSED_DIRS was explicitly set
# or CATALINA_HOME/endorsed exists.
ENDORSED_PROP=ignore.endorsed.dirs
if [ -n "$JAVA_ENDORSED_DIRS" ]; then
ENDORSED_PROP=java.endorsed.dirs
fi
if [ -d "$CATALINA_HOME/endorsed" ]; then
ENDORSED_PROP=java.endorsed.dirs
fi
# Make the umask available when using the org.apache.catalina.security.SecurityListener
JAVA_OPTS="$JAVA_OPTS -Dorg.apache.catalina.security.SecurityListener.UMASK=`umask`"
if [ -z "$USE_NOHUP" ]; then
if $hpux; then
USE_NOHUP="true"
else
USE_NOHUP="false"
fi
fi
unset _NOHUP
if [ "$USE_NOHUP" = "true" ]; then
_NOHUP="nohup"
fi
# Add the JAVA 9 specific start-up parameters required by Tomcat
JDK_JAVA_OPTIONS="$JDK_JAVA_OPTIONS --add-opens=java.base/java.lang=ALL-UNNAMED"
JDK_JAVA_OPTIONS="$JDK_JAVA_OPTIONS --add-opens=java.base/java.io=ALL-UNNAMED"
JDK_JAVA_OPTIONS="$JDK_JAVA_OPTIONS --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED"
export JDK_JAVA_OPTIONS
# ----- Execute The Requested Command -----------------------------------------
# Bugzilla 37848: only output this if we have a TTY
if [ $have_tty -eq 1 ]; then
echo "Using CATALINA_BASE: $CATALINA_BASE"
echo "Using CATALINA_HOME: $CATALINA_HOME"
echo "Using CATALINA_TMPDIR: $CATALINA_TMPDIR"
if [ "$1" = "debug" ] ; then
echo "Using JAVA_HOME: $JAVA_HOME"
else
echo "Using JRE_HOME: $JRE_HOME"
fi
echo "Using CLASSPATH: $CLASSPATH"
if [ ! -z "$CATALINA_PID" ]; then
echo "Using CATALINA_PID: $CATALINA_PID"
fi
fi
if [ "$1" = "jpda" ] ; then
if [ -z "$JPDA_TRANSPORT" ]; then
JPDA_TRANSPORT="dt_socket"
fi
if [ -z "$JPDA_ADDRESS" ]; then
JPDA_ADDRESS="localhost:8000"
fi
if [ -z "$JPDA_SUSPEND" ]; then
JPDA_SUSPEND="n"
fi
if [ -z "$JPDA_OPTS" ]; then
JPDA_OPTS="-agentlib:jdwp=transport=$JPDA_TRANSPORT,address=$JPDA_ADDRESS,server=y,suspend=$JPDA_SUSPEND"
fi
CATALINA_OPTS="$JPDA_OPTS $CATALINA_OPTS"
shift
fi
# TODO: Bugzilla 63815
# This doesn't currently work (and can't be made to work) if values used in
# CATALINA_OPTS and/or JAVA_OPTS require quoting. See:
# https://bugs.openjdk.java.net/browse/JDK-8234808
if [ "$1" = "debug" ] ; then
if $os400; then
echo "Debug command not available on OS400"
exit 1
else
shift
if [ "$1" = "-security" ] ; then
if [ $have_tty -eq 1 ]; then
echo "Using Security Manager"
fi
shift
exec "$_RUNJDB" "$LOGGING_CONFIG" $LOGGING_MANAGER $JAVA_OPTS $CATALINA_OPTS \
-D$ENDORSED_PROP="$JAVA_ENDORSED_DIRS" \
-classpath "$CLASSPATH" \
-sourcepath "$CATALINA_HOME"/../../java \
-Djava.security.manager \
-Djava.security.policy=="$CATALINA_BASE"/conf/catalina.policy \
-Dcatalina.base="$CATALINA_BASE" \
-Dcatalina.home="$CATALINA_HOME" \
-Djava.io.tmpdir="$CATALINA_TMPDIR" \
org.apache.catalina.startup.Bootstrap "$@" start
else
exec "$_RUNJDB" "$LOGGING_CONFIG" $LOGGING_MANAGER $JAVA_OPTS $CATALINA_OPTS \
-D$ENDORSED_PROP="$JAVA_ENDORSED_DIRS" \
-classpath "$CLASSPATH" \
-sourcepath "$CATALINA_HOME"/../../java \
-Dcatalina.base="$CATALINA_BASE" \
-Dcatalina.home="$CATALINA_HOME" \
-Djava.io.tmpdir="$CATALINA_TMPDIR" \
org.apache.catalina.startup.Bootstrap "$@" start
fi
fi
elif [ "$1" = "run" ]; then
shift
if [ "$1" = "-security" ] ; then
if [ $have_tty -eq 1 ]; then
echo "Using Security Manager"
fi
shift
eval exec "\"$_RUNJAVA\"" "\"$LOGGING_CONFIG\"" $LOGGING_MANAGER "$JAVA_OPTS" "$CATALINA_OPTS" \
-D$ENDORSED_PROP="\"$JAVA_ENDORSED_DIRS\"" \
-classpath "\"$CLASSPATH\"" \
-Djava.security.manager \
-Djava.security.policy=="\"$CATALINA_BASE/conf/catalina.policy\"" \
-Dcatalina.base="\"$CATALINA_BASE\"" \
-Dcatalina.home="\"$CATALINA_HOME\"" \
-Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \
org.apache.catalina.startup.Bootstrap "$@" start
else
eval exec "\"$_RUNJAVA\"" "\"$LOGGING_CONFIG\"" $LOGGING_MANAGER "$JAVA_OPTS" "$CATALINA_OPTS" \
-D$ENDORSED_PROP="\"$JAVA_ENDORSED_DIRS\"" \
-classpath "\"$CLASSPATH\"" \
-Dcatalina.base="\"$CATALINA_BASE\"" \
-Dcatalina.home="\"$CATALINA_HOME\"" \
-Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \
org.apache.catalina.startup.Bootstrap "$@" start
fi
elif [ "$1" = "start" ] ; then
if [ ! -z "$CATALINA_PID" ]; then
if [ -f "$CATALINA_PID" ]; then
if [ -s "$CATALINA_PID" ]; then
echo "Existing PID file found during start."
if [ -r "$CATALINA_PID" ]; then
PID=`cat "$CATALINA_PID"`
ps -p $PID >/dev/null 2>&1
if [ $? -eq 0 ] ; then
echo "Tomcat appears to still be running with PID $PID. Start aborted."
echo "If the following process is not a Tomcat process, remove the PID file and try again:"
ps -f -p $PID
exit 1
else
echo "Removing/clearing stale PID file."
rm -f "$CATALINA_PID" >/dev/null 2>&1
if [ $? != 0 ]; then
if [ -w "$CATALINA_PID" ]; then
cat /dev/null > "$CATALINA_PID"
else
echo "Unable to remove or clear stale PID file. Start aborted."
exit 1
fi
fi
fi
else
echo "Unable to read PID file. Start aborted."
exit 1
fi
else
rm -f "$CATALINA_PID" >/dev/null 2>&1
if [ $? != 0 ]; then
if [ ! -w "$CATALINA_PID" ]; then
echo "Unable to remove or write to empty PID file. Start aborted."
exit 1
fi
fi
fi
fi
fi
shift
touch "$CATALINA_OUT"
if [ "$1" = "-security" ] ; then
if [ $have_tty -eq 1 ]; then
echo "Using Security Manager"
fi
shift
eval $_NOHUP "\"$_RUNJAVA\"" "\"$LOGGING_CONFIG\"" $LOGGING_MANAGER "$JAVA_OPTS" "$CATALINA_OPTS" \
-D$ENDORSED_PROP="\"$JAVA_ENDORSED_DIRS\"" \
-classpath "\"$CLASSPATH\"" \
-Djava.security.manager \
-Djava.security.policy=="\"$CATALINA_BASE/conf/catalina.policy\"" \
-Dcatalina.base="\"$CATALINA_BASE\"" \
-Dcatalina.home="\"$CATALINA_HOME\"" \
-Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \
org.apache.catalina.startup.Bootstrap "$@" start \
>> "$CATALINA_OUT" 2>&1 "&"
else
eval $_NOHUP "\"$_RUNJAVA\"" "\"$LOGGING_CONFIG\"" $LOGGING_MANAGER "$JAVA_OPTS" "$CATALINA_OPTS" \
-D$ENDORSED_PROP="\"$JAVA_ENDORSED_DIRS\"" \
-classpath "\"$CLASSPATH\"" \
-Dcatalina.base="\"$CATALINA_BASE\"" \
-Dcatalina.home="\"$CATALINA_HOME\"" \
-Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \
org.apache.catalina.startup.Bootstrap "$@" start \
>> "$CATALINA_OUT" 2>&1 "&"
fi
if [ ! -z "$CATALINA_PID" ]; then
echo $! > "$CATALINA_PID"
fi
echo "Tomcat started."
elif [ "$1" = "stop" ] ; then
shift
SLEEP=5
if [ ! -z "$1" ]; then
echo $1 | grep "[^0-9]" >/dev/null 2>&1
if [ $? -gt 0 ]; then
SLEEP=$1
shift
fi
fi
FORCE=0
if [ "$1" = "-force" ]; then
shift
FORCE=1
fi
if [ ! -z "$CATALINA_PID" ]; then
if [ -f "$CATALINA_PID" ]; then
if [ -s "$CATALINA_PID" ]; then
kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1
if [ $? -gt 0 ]; then
echo "PID file found but either no matching process was found or the current user does not have permission to stop the process. Stop aborted."
exit 1
fi
else
echo "PID file is empty and has been ignored."
fi
else
echo "\$CATALINA_PID was set but the specified file does not exist. Is Tomcat running? Stop aborted."
exit 1
fi
fi
eval "\"$_RUNJAVA\"" $LOGGING_MANAGER "$JAVA_OPTS" \
-D$ENDORSED_PROP="\"$JAVA_ENDORSED_DIRS\"" \
-classpath "\"$CLASSPATH\"" \
-Dcatalina.base="\"$CATALINA_BASE\"" \
-Dcatalina.home="\"$CATALINA_HOME\"" \
-Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \
org.apache.catalina.startup.Bootstrap "$@" stop
# stop failed. Shutdown port disabled? Try a normal kill.
if [ $? != 0 ]; then
if [ ! -z "$CATALINA_PID" ]; then
echo "The stop command failed. Attempting to signal the process to stop through OS signal."
kill -15 `cat "$CATALINA_PID"` >/dev/null 2>&1
fi
fi
if [ ! -z "$CATALINA_PID" ]; then
if [ -f "$CATALINA_PID" ]; then
while [ $SLEEP -ge 0 ]; do
kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1
if [ $? -gt 0 ]; then
rm -f "$CATALINA_PID" >/dev/null 2>&1
if [ $? != 0 ]; then
if [ -w "$CATALINA_PID" ]; then
cat /dev/null > "$CATALINA_PID"
# If Tomcat has stopped don't try and force a stop with an empty PID file
FORCE=0
else
echo "The PID file could not be removed or cleared."
fi
fi
echo "Tomcat stopped."
break
fi
if [ $SLEEP -gt 0 ]; then
sleep 1
fi
if [ $SLEEP -eq 0 ]; then
echo "Tomcat did not stop in time."
if [ $FORCE -eq 0 ]; then
echo "PID file was not removed."
fi
echo "To aid diagnostics a thread dump has been written to standard out."
kill -3 `cat "$CATALINA_PID"`
fi
SLEEP=`expr $SLEEP - 1 `
done
fi
fi
KILL_SLEEP_INTERVAL=5
if [ $FORCE -eq 1 ]; then
if [ -z "$CATALINA_PID" ]; then
echo "Kill failed: \$CATALINA_PID not set"
else
if [ -f "$CATALINA_PID" ]; then
PID=`cat "$CATALINA_PID"`
echo "Killing Tomcat with the PID: $PID"
kill -9 $PID
while [ $KILL_SLEEP_INTERVAL -ge 0 ]; do
kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1
if [ $? -gt 0 ]; then
rm -f "$CATALINA_PID" >/dev/null 2>&1
if [ $? != 0 ]; then
if [ -w "$CATALINA_PID" ]; then
cat /dev/null > "$CATALINA_PID"
else
echo "The PID file could not be removed."
fi
fi
echo "The Tomcat process has been killed."
break
fi
if [ $KILL_SLEEP_INTERVAL -gt 0 ]; then
sleep 1
fi
KILL_SLEEP_INTERVAL=`expr $KILL_SLEEP_INTERVAL - 1 `
done
if [ $KILL_SLEEP_INTERVAL -lt 0 ]; then
echo "Tomcat has not been killed completely yet. The process might be waiting on some system call or might be UNINTERRUPTIBLE."
fi
fi
fi
fi
elif [ "$1" = "configtest" ] ; then
eval "\"$_RUNJAVA\"" $LOGGING_MANAGER "$JAVA_OPTS" \
-D$ENDORSED_PROP="\"$JAVA_ENDORSED_DIRS\"" \
-classpath "\"$CLASSPATH\"" \
-Dcatalina.base="\"$CATALINA_BASE\"" \
-Dcatalina.home="\"$CATALINA_HOME\"" \
-Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \
org.apache.catalina.startup.Bootstrap configtest
result=$?
if [ $result -ne 0 ]; then
echo "Configuration error detected!"
fi
exit $result
elif [ "$1" = "version" ] ; then
"$_RUNJAVA" \
-classpath "$CATALINA_HOME/lib/catalina.jar" \
org.apache.catalina.util.ServerInfo
else
echo "Usage: catalina.sh ( commands ... )"
echo "commands:"
if $os400; then
echo " debug Start Catalina in a debugger (not available on OS400)"
echo " debug -security Debug Catalina with a security manager (not available on OS400)"
else
echo " debug Start Catalina in a debugger"
echo " debug -security Debug Catalina with a security manager"
fi
echo " jpda start Start Catalina under JPDA debugger"
echo " run Start Catalina in the current window"
echo " run -security Start in the current window with security manager"
echo " start Start Catalina in a separate window"
echo " start -security Start in a separate window with security manager"
echo " stop Stop Catalina, waiting up to 5 seconds for the process to end"
echo " stop n Stop Catalina, waiting up to n seconds for the process to end"
echo " stop -force Stop Catalina, wait up to 5 seconds and then use kill -KILL if still running"
echo " stop n -force Stop Catalina, wait up to n seconds and then use kill -KILL if still running"
echo " configtest Run a basic syntax check on server.xml - check exit code for result"
echo " version What version of tomcat are you running?"
echo "Note: Waiting for the process to end and use of the -force option require that \$CATALINA_PID is defined"
exit 1
fi
我的 setenv.sh 文件
# -Xms/Xmx
# Xms Sets the initial size of the Heap
# Xmx sets the Maximum size of the Heap.
# http://stackoverflow.com/questions/16087153/what-happens-when-we-set-xmx-and-xms-equal-size
# http://crunchify.com/jvm-tuning-heapsize-stacksize-garbage-collection-fundamental/
export JAVA_OPTS="$JAVA_OPTS -Xms3072m -Xmx3072m"