【问题标题】:Obsolete cryptography warning from Browser来自浏览器的过时加密警告
【发布时间】:2015-07-28 01:03:47
【问题描述】:

我已经使用 Apache 2.4 和 SSL 启动了一个 Windows Server。当我与https://www.example.com 连接并单击绿色锁时,我有消息:

您与网站的连接使用过时的加密技术进行加密

有什么建议吗?

下面是ssl.conf

    #
    # This is the Apache server configuration file providing SSL support.
    # It contains the configuration directives to instruct the server how to
    # serve pages over an https connection. For detailed information about these 
    # directives see <URL:http://httpd.apache.org/docs/2.4/mod/mod_ssl.html>
    # 
    # Do NOT simply read the instructions in here without understanding
    # what they do.  They're here only as hints or reminders.  If you are unsure
    # consult the online docs. You have been warned.  
    #
    # Required modules: mod_log_config, mod_setenvif, mod_ssl,
    #          socache_shmcb_module (for default value of SSLSessionCache)

    #
    # Pseudo Random Number Generator (PRNG):
    # Configure one or more sources to seed the PRNG of the SSL library.
    # The seed data should be of good random quality.
    # WARNING! On some platforms /dev/random blocks if not enough entropy
    # is available. This means you then cannot use the /dev/random device
    # because it would lead to very long connection times (as long as
    # it requires to make more entropy available). But usually those
    # platforms additionally provide a /dev/urandom device which doesn't
    # block. So, if available, use this one instead. Read the mod_ssl User
    # Manual for more details.
    #
    #SSLRandomSeed startup file:/dev/random  512
    #SSLRandomSeed startup file:/dev/urandom 512

    #
    # When we also provide SSL we have to listen to the 
    # standard HTTP port (see above) and to the HTTPS port
    #
    Listen 443

    ##
    ##  SSL Global Context
    ##
    ##  All SSL configuration in this context applies both to
    ##  the main server and all SSL-enabled virtual hosts.
    ##

    #   SSL Cipher Suite:
    #   List the ciphers that the client is permitted to negotiate.
    #   See the mod_ssl documentation for a complete list.
    #SSLCipherSuite HIGH:MEDIUM:!aNULL:!MD5


    #   Speed-optimized SSL Cipher configuration:
    #   If speed is your main concern (on busy HTTPS servers e.g.),
    #   you might want to force clients to specific, performance
    #   optimized ciphers. In this case, prepend those ciphers
    #   to the SSLCipherSuite list, and enable SSLHonorCipherOrder.
    #   Caveat: by giving precedence to RC4-SHA and AES128-SHA
    #   (as in the example below), most connections will no longer
    #   have perfect forward secrecy - if the server's key is
    #   compromised, captures of past or future traffic must be
    #   considered compromised, too.
    SSLCipherSuite RC4-SHA:AES128-SHA:HIGH:MEDIUM:!aNULL:!MD5
    #SSLHonorCipherOrder on 

    #   Pass Phrase Dialog:
    #   Configure the pass phrase gathering process.
    #   The filtering dialog program (`builtin' is an internal
    #   terminal dialog) has to provide the pass phrase on stdout.
    SSLPassPhraseDialog  builtin

    #   Inter-Process Session Cache:
    #   Configure the SSL Session Cache: First the mechanism 
    #   to use and second the expiring timeout (in seconds).
    #SSLSessionCache         "dbm:c:/Apache24/logs/ssl_scache"

    # Estes 2 estavam ativos
    #SSLSessionCache        "shmcb:c:/Apache24/logs/ssl_scache(512000)"
    #SSLSessionCacheTimeout  300

    #   OCSP Stapling (requires OpenSSL 0.9.8h or later)
    #
    #   This feature is disabled by default and requires at least
    #   the two directives SSLUseStapling and SSLStaplingCache.
    #   Refer to the documentation on OCSP Stapling in the SSL/TLS
    #   How-To for more information.
    #
    #   Enable stapling for all SSL-enabled servers:
    #SSLUseStapling On

    #   Define a relatively small cache for OCSP Stapling using
    #   the same mechanism that is used for the SSL session cache
    #   above.  If stapling is used with more than a few certificates,
    #   the size may need to be increased.  (AH01929 will be logged.)
    #SSLStaplingCache "shmcb:c:/Apache24/logs/ssl_stapling(32768)"

    #   Seconds before valid OCSP responses are expired from the cache
    #SSLStaplingStandardCacheTimeout 3600

    #   Seconds before invalid OCSP responses are expired from the cache
    #SSLStaplingErrorCacheTimeout 600

    ##
    ## SSL Virtual Host Context
    ##

    <VirtualHost *:443>

    #   General setup for the virtual host
    DocumentRoot "c:/Apache24/htdocs"
    ServerName www.xxx.com:443
    ServerAdmin webmaster@xxx.com
    ErrorLog "c:/Apache24/logs/error.log"
    TransferLog "c:/Apache24/logs/access.log"

    #   SSL Engine Switch:
    #   Enable/Disable SSL for this virtual host.
    SSLEngine on


    #   Server Certificate:
    #   Point SSLCertificateFile at a PEM encoded certificate.  If
    #   the certificate is encrypted, then you will be prompted for a
    #   pass phrase.  Note that a kill -HUP will prompt again.  Keep
    #   in mind that if you have both an RSA and a DSA certificate you
    #   can configure both in parallel (to also allow the use of DSA
    #   ciphers, etc.)
    #   Some ECC cipher suites (http://www.ietf.org/rfc/rfc4492.txt)
    #   require an ECC certificate which can also be configured in
    #   parallel.
    SSLCertificateFile "c:/Apache24/conf/aws-101.crt"
    #SSLCertificateFile "c:/Apache24/conf/server-dsa.crt"
    #SSLCertificateFile "c:/Apache24/conf/server-ecc.crt"

    #   Server Private Key:
    #   If the key is not combined with the certificate, use this
    #   directive to point at the key file.  Keep in mind that if
    #   you've both a RSA and a DSA private key you can configure
    #   both in parallel (to also allow the use of DSA ciphers, etc.)
    #   ECC keys, when in use, can also be configured in parallel
    SSLCertificateKeyFile "c:/Apache24/conf/aws-101.key"

    #   Server Certificate Chain:
    #   Point SSLCertificateChainFile at a file containing the
    #   concatenation of PEM encoded CA certificates which form the
    #   certificate chain for the server certificate. Alternatively
    #   the referenced file can be the same as SSLCertificateFile
    #   when the CA certificates are directly appended to the server
    #   certificate for convenience.
    SSLCertificateChainFile "c:/Apache24/conf/aws-101_ca_bundle.crt"

    #   Certificate Authority (CA):
    #   Set the CA certificate verification path where to find CA
    #   certificates for client authentication or alternatively one
    #   huge file containing all of them (file must be PEM encoded)
    #   Note: Inside SSLCACertificatePath you need hash symlinks
    #         to point to the certificate files. Use the provided
    #         Makefile to update the hash symlinks after changes.
    #SSLCACertificatePath "c:/Apache24/conf/aws-101_ca_bundle.crt"
    #SSLCACertificateFile "c:/Apache24/conf/aws-101_ca_bundle.crt"

    #   Certificate Revocation Lists (CRL):
    #   Set the CA revocation path where to find CA CRLs for client
    #   authentication or alternatively one huge file containing all
    #   of them (file must be PEM encoded).
    #   The CRL checking mode needs to be configured explicitly
    #   through SSLCARevocationCheck (defaults to "none" otherwise).
    #   Note: Inside SSLCARevocationPath you need hash symlinks
    #         to point to the certificate files. Use the provided
    #         Makefile to update the hash symlinks after changes.
    #SSLCARevocationPath "c:/Apache24/conf/ssl.crl"
    #SSLCARevocationFile "c:/Apache24/conf/ssl.crl/ca-bundle.crl"
    #SSLCARevocationCheck chain

    #   Client Authentication (Type):
    #   Client certificate verification type and depth.  Types are
    #   none, optional, require and optional_no_ca.  Depth is a
    #   number which specifies how deeply to verify the certificate
    #   issuer chain before deciding the certificate is not valid.
    #SSLVerifyClient require
    #SSLVerifyDepth  10

    #   TLS-SRP mutual authentication:
    #   Enable TLS-SRP and set the path to the OpenSSL SRP verifier
    #   file (containing login information for SRP user accounts). 
    #   Requires OpenSSL 1.0.1 or newer. See the mod_ssl FAQ for
    #   detailed instructions on creating this file. Example:
    #   "openssl srp -srpvfile c:/Apache24/conf/passwd.srpv -add username"
    #SSLSRPVerifierFile "c:/Apache24/conf/passwd.srpv"

    #   Access Control:
    #   With SSLRequire you can do per-directory access control based
    #   on arbitrary complex boolean expressions containing server
    #   variable checks and other lookup directives.  The syntax is a
    #   mixture between C and Perl.  See the mod_ssl documentation
    #   for more details.
    #<Location />
    #SSLRequire (    %{SSL_CIPHER} !~ m/^(EXP|NULL)/ \
    #            and %{SSL_CLIENT_S_DN_O} eq "Snake Oil, Ltd." \
    #            and %{SSL_CLIENT_S_DN_OU} in {"Staff", "CA", "Dev"} \
    #            and %{TIME_WDAY} >= 1 and %{TIME_WDAY} <= 5 \
    #            and %{TIME_HOUR} >= 8 and %{TIME_HOUR} <= 20       ) \
    #           or %{REMOTE_ADDR} =~ m/^192\.76\.162\.[0-9]+$/
    #</Location>

    #   SSL Engine Options:
    #   Set various options for the SSL engine.
    #   o FakeBasicAuth:
    #     Translate the client X.509 into a Basic Authorisation.  This means that
    #     the standard Auth/DBMAuth methods can be used for access control.  The
    #     user name is the `one line' version of the client's X.509 certificate.
    #     Note that no password is obtained from the user. Every entry in the user
    #     file needs this password: `xxj31ZMTZzkVA'.
    #   o ExportCertData:
    #     This exports two additional environment variables: SSL_CLIENT_CERT and
    #     SSL_SERVER_CERT. These contain the PEM-encoded certificates of the
    #     server (always existing) and the client (only existing when client
    #     authentication is used). This can be used to import the certificates
    #     into CGI scripts.
    #   o StdEnvVars:
    #     This exports the standard SSL/TLS related `SSL_*' environment variables.
    #     Per default this exportation is switched off for performance reasons,
    #     because the extraction step is an expensive operation and is usually
    #     useless for serving static content. So one usually enables the
    #     exportation for CGI and SSI requests only.
    #   o StrictRequire:
    #     This denies access when "SSLRequireSSL" or "SSLRequire" applied even
    #     under a "Satisfy any" situation, i.e. when it applies access is denied
    #     and no other module can change it.
    #   o OptRenegotiate:
    #     This enables optimized SSL connection renegotiation handling when SSL
    #     directives are used in per-directory context. 
    #SSLOptions +FakeBasicAuth +ExportCertData +StrictRequire
    <FilesMatch "\.(cgi|shtml|phtml|php)$">
        SSLOptions +StdEnvVars
    </FilesMatch>
    <Directory "c:/Apache24/cgi-bin">
        SSLOptions +StdEnvVars
    </Directory>

    #   SSL Protocol Adjustments:
    #   The safe and default but still SSL/TLS standard compliant shutdown
    #   approach is that mod_ssl sends the close notify alert but doesn't wait for
    #   the close notify alert from client. When you need a different shutdown
    #   approach you can use one of the following variables:
    #   o ssl-unclean-shutdown:
    #     This forces an unclean shutdown when the connection is closed, i.e. no
    #     SSL close notify alert is sent or allowed to be received.  This violates
    #     the SSL/TLS standard but is needed for some brain-dead browsers. Use
    #     this when you receive I/O errors because of the standard approach where
    #     mod_ssl sends the close notify alert.
    #   o ssl-accurate-shutdown:
    #     This forces an accurate shutdown when the connection is closed, i.e. a
    #     SSL close notify alert is send and mod_ssl waits for the close notify
    #     alert of the client. This is 100% SSL/TLS standard compliant, but in
    #     practice often causes hanging connections with brain-dead browsers. Use
    #     this only for browsers where you know that their SSL implementation
    #     works correctly. 
    #   Notice: Most problems of broken clients are also related to the HTTP
    #   keep-alive facility, so you usually additionally want to disable
    #   keep-alive for those clients, too. Use variable "nokeepalive" for this.
    #   Similarly, one has to force some clients to use HTTP/1.0 to workaround
    #   their broken HTTP/1.1 implementation. Use variables "downgrade-1.0" and
    #   "force-response-1.0" for this.
    BrowserMatch "MSIE [2-5]" \
             nokeepalive ssl-unclean-shutdown \
             downgrade-1.0 force-response-1.0

    #   Per-Server Logging:
    #   The home of a custom SSL log file. Use this when you want a
    #   compact non-error SSL logfile on a virtual host basis.
    CustomLog "c:/Apache24/logs/ssl_request.log" \
              "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"

    </VirtualHost>                                  

【问题讨论】:

标签: apache ssl openssl


【解决方案1】:

来自https://www.chromium.org/Home/chromium-security/education/tls#TOC-Deprecation-of-TLS-Features-Algorithms-in-Chrome

过时的密码套件

你可能会看到:

“您与 example.com 的连接已使用过时加密 密码学。”

这意味着与当前网站的连接正在使用 过时的密码套件(如果服务器坚持,Chrome 仍然允许使用 就可以了)。

为了让消息表明“现代密码学”, 连接应使用前向保密和 AES-GCM 或 CHACHA20_POLY1305。众所周知,其他密码套件存在弱点。 大多数服务器都希望协商 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256。

所有这一切都归结为您的配置中的以下几行,它们决定了哪些密码套件受支持并优先考虑与客户端的连接。

SSLProtocol
SSLCipherSuite
SSLHonorCipherOrder

根据https://certsimple.com/blog/chrome-outdated-cryptographyhttps://mozilla.github.io/server-side-tls/ssl-config-generator/,您可能想尝试一下:

SSLProtocol             all -SSLv2 -SSLv3
SSLCipherSuite          ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
SSLHonorCipherOrder     on

另见:

[1] https://mozilla.github.io/server-side-tls/ssl-config-generator/ - 建议安全配置

[2] https://www.ssllabs.com/ssltest/index.html -- 测试服务器的 SSL 配置

【讨论】:

    【解决方案2】:

    您与网站的连接使用过时的加密技术进行加密...
    有什么建议吗?

    HIGH:MEDIUM:!aNULL:!MD5SSLCipherSuite 还不错。您应该将其更改为 HIGH:!aNULL:!MD5:!RC4,因为 MEDIUM 很弱,而 RC4 很弱/受伤。

    浏览器正在转向标记/警告 RC4 的使用。例如,请参阅Connection information claims RC4 is "high grade"


    如果您只想使用临时或临时 Diffie-Hellman 密钥(您应该这样做),那么您也应该删除 RSA 密钥传输:

    SSLCipherSuite  HIGH:!aNULL:!kRSA:!MD5:!RC4
    

    正如 Anand 指出的,您应该禁用 SSLv2 和 SSLv3:

    SSLProtocol all -SSLv2 -SSLv3
    

    相关,您可以使用openssl ciphers 命令根据您使用的字符串获取启用的密码套件列表。因为您没有使用 DSS、SRP 或 PSK,您甚至可以在字符串中包含 !DSS:!DSA:!SRP:!PSK

    $ openssl ciphers -v 'HIGH:!aNULL:!kRSA:!MD5:!RC4:!DSS:!DSA:!SRP:!PSK'
    ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AESGCM(256) Mac=AEAD
    ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=AESGCM(256) Mac=AEAD
    ECDHE-RSA-AES256-SHA384 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AES(256)  Mac=SHA384
    ECDHE-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=AES(256)  Mac=SHA384
    ECDHE-RSA-AES256-SHA    SSLv3 Kx=ECDH     Au=RSA  Enc=AES(256)  Mac=SHA1
    ECDHE-ECDSA-AES256-SHA  SSLv3 Kx=ECDH     Au=ECDSA Enc=AES(256)  Mac=SHA1
    DHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=DH       Au=RSA  Enc=AESGCM(256) Mac=AEAD
    DHE-RSA-AES256-SHA256   TLSv1.2 Kx=DH       Au=RSA  Enc=AES(256)  Mac=SHA256
    DHE-RSA-AES256-SHA      SSLv3 Kx=DH       Au=RSA  Enc=AES(256)  Mac=SHA1
    DHE-RSA-CAMELLIA256-SHA SSLv3 Kx=DH       Au=RSA  Enc=Camellia(256) Mac=SHA1
    ECDH-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AESGCM(256) Mac=AEAD
    ECDH-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AESGCM(256) Mac=AEAD
    ECDH-RSA-AES256-SHA384  TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AES(256)  Mac=SHA384
    ECDH-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AES(256)  Mac=SHA384
    ECDH-RSA-AES256-SHA     SSLv3 Kx=ECDH/RSA Au=ECDH Enc=AES(256)  Mac=SHA1
    ECDH-ECDSA-AES256-SHA   SSLv3 Kx=ECDH/ECDSA Au=ECDH Enc=AES(256)  Mac=SHA1
    ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AESGCM(128) Mac=AEAD
    ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=AESGCM(128) Mac=AEAD
    ECDHE-RSA-AES128-SHA256 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AES(128)  Mac=SHA256
    ECDHE-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=AES(128)  Mac=SHA256
    ECDHE-RSA-AES128-SHA    SSLv3 Kx=ECDH     Au=RSA  Enc=AES(128)  Mac=SHA1
    ECDHE-ECDSA-AES128-SHA  SSLv3 Kx=ECDH     Au=ECDSA Enc=AES(128)  Mac=SHA1
    DHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=DH       Au=RSA  Enc=AESGCM(128) Mac=AEAD
    DHE-RSA-AES128-SHA256   TLSv1.2 Kx=DH       Au=RSA  Enc=AES(128)  Mac=SHA256
    DHE-RSA-AES128-SHA      SSLv3 Kx=DH       Au=RSA  Enc=AES(128)  Mac=SHA1
    DHE-RSA-CAMELLIA128-SHA SSLv3 Kx=DH       Au=RSA  Enc=Camellia(128) Mac=SHA1
    ECDH-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AESGCM(128) Mac=AEAD
    ECDH-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AESGCM(128) Mac=AEAD
    ECDH-RSA-AES128-SHA256  TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AES(128)  Mac=SHA256
    ECDH-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AES(128)  Mac=SHA256
    ECDH-RSA-AES128-SHA     SSLv3 Kx=ECDH/RSA Au=ECDH Enc=AES(128)  Mac=SHA1
    ECDH-ECDSA-AES128-SHA   SSLv3 Kx=ECDH/ECDSA Au=ECDH Enc=AES(128)  Mac=SHA1
    ECDHE-RSA-DES-CBC3-SHA  SSLv3 Kx=ECDH     Au=RSA  Enc=3DES(168) Mac=SHA1
    ECDHE-ECDSA-DES-CBC3-SHA SSLv3 Kx=ECDH     Au=ECDSA Enc=3DES(168) Mac=SHA1
    EDH-RSA-DES-CBC3-SHA    SSLv3 Kx=DH       Au=RSA  Enc=3DES(168) Mac=SHA1
    ECDH-RSA-DES-CBC3-SHA   SSLv3 Kx=ECDH/RSA Au=ECDH Enc=3DES(168) Mac=SHA1
    ECDH-ECDSA-DES-CBC3-SHA SSLv3 Kx=ECDH/ECDSA Au=ECDH Enc=3DES(168) Mac=SHA1
    

    【讨论】:

    • +1 因为它很有用,但 SSLCipherSuite HIGH:!aNULL:!kRSA:!MD5:!RC4 在浏览器中会出错。也许是具有不同“HIGH”标准的旧服务器?
    • HIGH:!aNULL:!MD5:!RC4 适用于所有浏览器,然后 chrome 使用 RSA 进行密钥传输。也许我的服务器 openssl 不支持正确的非 RSA 密钥传输。
    【解决方案3】:

    访问http://ssllabs.com 并按照说明验证您的网站。然后他们会告诉你哪里出了问题以及如何解决它。几乎可以肯定,您将不得不删除 RC4 套件,但该网站会告诉您,不要依赖我。

    【讨论】:

    • 相关,请注意 SSL Labs 报告。有时,它会产生虚假的发现。您最终可能会尝试解决不存在的问题。
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