OpenLDAP 和 SSL

Question

我在尝试连接到我设置的安全 OpenLDAP 服务器时遇到问题。在运行 LDAP 客户端代码时

java -Djavax.net.debug=ssl LDAPConnector

，我收到以下异常跟踪（java 版本 1.6.0_17）

trigger seeding of SecureRandom
done seeding SecureRandom
%% No cached client session
*** ClientHello, TLSv1
RandomCookie:  GMT: 1256110124 bytes = { 224, 19, 193, 148, 45, 205, 108, 37, 101, 247, 112, 24, 157, 39, 111, 177, 43, 53, 206, 224, 68, 165, 55, 185, 54, 203, 43, 91 }
Session ID:  {}
Cipher Suites: [SSL_RSA_WITH_RC4_128_MD5, SSL_RSA_WITH_RC4_128_SHA, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_DSS_WITH_AES_128_CBC_SHA, SSL_RSA_W
ITH_3DES_EDE_CBC_SHA, SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA, SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA, SSL_RSA_WITH_DES_CBC_SHA, SSL_DHE_RSA_WITH_DES_CBC_SHA, SSL_DHE_DSS_WITH_DES_CBC_SH
A, SSL_RSA_EXPORT_WITH_RC4_40_MD5, SSL_RSA_EXPORT_WITH_DES40_CBC_SHA, SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA, SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA]
Compression Methods:  { 0 }
***
Thread-0, WRITE: TLSv1 Handshake, length = 73
Thread-0, WRITE: SSLv2 client hello message, length = 98
Thread-0, received EOFException: error
Thread-0, handling exception: javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
Thread-0, SEND TLSv1 ALERT:  fatal, description = handshake_failure
Thread-0, WRITE: TLSv1 Alert, length = 2
Thread-0, called closeSocket()
main, handling exception: javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
javax.naming.CommunicationException: simple bind failed: ldap.natraj.com:636 [Root exception is javax.net.ssl.SSLHandshakeException: Remote host closed connection during hands
hake]
        at com.sun.jndi.ldap.LdapClient.authenticate(Unknown Source)
        at com.sun.jndi.ldap.LdapCtx.connect(Unknown Source)
        at com.sun.jndi.ldap.LdapCtx.<init>(Unknown Source)
        at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(Unknown Source)
        at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(Unknown Source)
        at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(Unknown Source)
        at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(Unknown Source)
        at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
        at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
        at javax.naming.InitialContext.init(Unknown Source)
        at javax.naming.InitialContext.<init>(Unknown Source)
        at javax.naming.directory.InitialDirContext.<init>(Unknown Source)
        at LDAPConnector.CallSecureLDAPServer(LDAPConnector.java:43)
        at LDAPConnector.main(LDAPConnector.java:237)
Caused by: javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(Unknown Source)
        at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown Source)
        at java.io.BufferedInputStream.fill(Unknown Source)
        at java.io.BufferedInputStream.read1(Unknown Source)
        at java.io.BufferedInputStream.read(Unknown Source)
        at com.sun.jndi.ldap.Connection.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.io.EOFException: SSL peer shut down incorrectly
        at com.sun.net.ssl.internal.ssl.InputRecord.read(Unknown Source)
        ... 9 more

，但是如果我使用另一个版本的 java (1.6 .0_14)

我已在两个 JRE 的 cacerts 中创建并安装了服务器证书，如本指南中所述 --> 使用 SSL 的 OpenLDAP

我在运行 openssl s_client -connect ldap.natraj.com:636 -showcerts 的服务器上运行 ldapsearch -x

# extended LDIF
#
# LDAPv3
# base <dc=localdomain> (default) with scope subtree
# filter: (objectclass=*)
# requesting: ALL
#

# localdomain
dn: dc=localdomain
objectClass: top
objectClass: dcObject
objectClass: organization
o: localdomain
dc: localdomain

# admin, localdomain
dn: cn=admin,dc=localdomain
objectClass: simpleSecurityObject
objectClass: organizationalRole
cn: admin
description: LDAP administrator

# search result
search: 2
result: 0 Success

# numResponses: 3
# numEntries: 2

，我获得了自签名证书。

我的 slapd.conf 文件如下

#######################################################################
# Global Directives:

# Features to permit
#allow bind_v2

# Schema and objectClass definitions
include         /etc/ldap/schema/core.schema
include         /etc/ldap/schema/cosine.schema
include         /etc/ldap/schema/nis.schema
include         /etc/ldap/schema/inetorgperson.schema

# Where the pid file is put. The init.d script
# will not stop the server if you change this.
pidfile         /var/run/slapd/slapd.pid

# List of arguments that were passed to the server
argsfile        /var/run/slapd/slapd.args

# Read slapd.conf(5) for possible values
loglevel        none

# Where the dynamically loaded modules are stored
modulepath      /usr/lib/ldap
moduleload      back_hdb

# The maximum number of entries that is returned for a search operation
sizelimit 500

# The tool-threads parameter sets the actual amount of cpu's that is used
# for indexing.
tool-threads 1

#######################################################################
# Specific Backend Directives for hdb:
# Backend specific directives apply to this backend until another
# 'backend' directive occurs
backend         hdb

#######################################################################
# Specific Backend Directives for 'other':
# Backend specific directives apply to this backend until another
# 'backend' directive occurs
#backend                <other>

#######################################################################
# Specific Directives for database #1, of type hdb:
# Database specific directives apply to this databasse until another
# 'database' directive occurs
database        hdb

# The base of your directory in database #1
suffix          "dc=localdomain"

# rootdn directive for specifying a superuser on the database. This is needed
# for syncrepl.
rootdn          "cn=admin,dc=localdomain"

# Where the database file are physically stored for database #1
directory       "/var/lib/ldap"

# The dbconfig settings are used to generate a DB_CONFIG file the first
# time slapd starts.  They do NOT override existing an existing DB_CONFIG
# file.  You should therefore change these settings in DB_CONFIG directly
# or remove DB_CONFIG and restart slapd for changes to take effect.

# For the Debian package we use 2MB as default but be sure to update this
# value if you have plenty of RAM
dbconfig set_cachesize 0 2097152 0

# Sven Hartge reported that he had to set this value incredibly high
# to get slapd running at all. See http://bugs.debian.org/303057 for more
# information.

# Number of objects that can be locked at the same time.
dbconfig set_lk_max_objects 1500
# Number of locks (both requested and granted)
dbconfig set_lk_max_locks 1500
# Number of lockers
dbconfig set_lk_max_lockers 1500

# Indexing options for database #1
index           objectClass eq

# Save the time that the entry gets modified, for database #1
lastmod         on

# Checkpoint the BerkeleyDB database periodically in case of system
# failure and to speed slapd shutdown.
checkpoint      512 30

# Where to store the replica logs for database #1
# replogfile    /var/lib/ldap/replog
# The userPassword by default can be changed
# by the entry owning it if they are authenticated.
# Others should not be able to see it, except the
# admin entry below
# These access lines apply to database #1 only
access to attrs=userPassword,shadowLastChange
        by dn="cn=admin,dc=localdomain" write
        by anonymous auth
        by self write
        by * none

# Ensure read access to the base for things like
# supportedSASLMechanisms.  Without this you may
# have problems with SASL not knowing what
# mechanisms are available and the like.
# Note that this is covered by the 'access to *'
# ACL below too but if you change that as people
# are wont to do you'll still need this if you
# want SASL (and possible other things) to work
# happily.
access to dn.base="" by * read

# The admin dn has full write access, everyone else
# can read everything.
access to *
        by dn="cn=admin,dc=localdomain" write
        by * read

# For Netscape Roaming support, each user gets a roaming
# profile for which they have write access to
#access to dn=".*,ou=Roaming,o=morsnet"
#        by dn="cn=admin,dc=localdomain" write
#        by dnattr=owner write
#######################################################################
# Specific Directives for database #2, of type 'other' (can be hdb too):
# Database specific directives apply to this databasse until another
# 'database' directive occurs
#database        <other>

# The base of your directory for database #2
#suffix         "dc=debian,dc=org"

#######################################################################
# SSL:
# Uncomment the following lines to enable SSL and use the default
# snakeoil certificates.
#TLSCertificateFile /etc/ssl/certs/ssl-cert-snakeoil.pem
#TLSCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key

TLSCipherSuite TLS_RSA_AES_256_CBC_SHA
TLSCACertificateFile /etc/ldap/ssl/server.pem
TLSCertificateFile /etc/ldap/ssl/server.pem
TLSCertificateKeyFile /etc/ldap/ssl/server.pem

我的 ldap.conf 文件是

#
# LDAP Defaults
#

# See ldap.conf(5) for details
# This file should be world readable but not world writable.

HOST ldap.natraj.com
PORT 636

BASE    dc=localdomain
URI     ldaps://ldap.natraj.com
TLS_CACERT    /etc/ldap/ssl/server.pem
TLS_REQCERT allow

#SIZELIMIT      12
#TIMELIMIT      15
#DEREF          never

为什么我可以使用一个版本的 JRE 连接到同一服务器，而不能使用另一个版本？

Answer 1

解决了这个问题。出现此问题的原因是 JRE（版本 1.6.0_17）发送的 CipherSuites 与服务器接受的 CipherSuites 不匹配。

服务器的 slapd.conf 包含该行

TLSCipherSuite TLS_RSA_AES_256_CBC_SHA

当这个特定的 Java 客户端发送一组包含 TLS_RSA_AES_128_CBC_SHA 的套件时， 。只需在 slapd.conf 中注释掉上述行即可解决该问题。造成混乱的原因是，当问题涉及 CipherSuites 时，服务器返回了 EOF 异常。

然而，JRE（版本 1.6.0_14）发送 TLS_RSA_AES_256_CBC_SHA 作为它接受的 CipherSuites 的一部分，因此相同的代码适用于此版本。

Answer 2

正如您在发送 SSLv2 ClientHello 后直接看到的那样，您应该尝试禁用 SSlv2ClientHello。请参阅 JSSE 参考指南。