Advertencia de criptografía obsoleta desde el navegador

He iniciado un servidor de Windows con Apache 2.4 y SSL. Cuando me conecto con https://www.example.com y hago clic en el candado verde, aparece un mensaje:

Su conexión al sitio web está encriptada con criptografía obsoleta

Algún consejo, por favor?

A continuación se muestra 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  # # 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 eg), # 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 ##  # 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. # #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} = 8 and %{TIME_HOUR} <= 20 ) \ # or %{REMOTE_ADDR} =~ m/^192\.76\.162\.[0-9]+$/ # # 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, ie 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  SSLOptions +StdEnvVars   SSLOptions +StdEnvVars  # 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, ie 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, ie 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"  

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

Suites de cifrado obsoletas

Usted puede ver:

“Su conexión con example.com está encriptada con criptografía obsoleta”.

Esto significa que la conexión al sitio web actual está usando un conjunto de cifrado obsoleto (que Chrome todavía permite si el servidor insiste en él).

Para que el mensaje indique “criptografía moderna”, la conexión debe usar el secreto de avance y AES-GCM o CHACHA20_POLY1305. Se sabe que otras suites de cifrado tienen puntos débiles. La mayoría de los servidores desearán negociar TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256.

Todo esto se reduce a las siguientes líneas en su configuración, que determinan qué suites de cifrado son compatibles y priorizadas para las conexiones con los clientes.

 SSLProtocol SSLCipherSuite SSLHonorCipherOrder 

Según https://certsimple.com/blog/chrome-outdated-cryptography y https://mozilla.github.io/server-side-tls/ssl-config-generator/ , puede probar esto:

 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 

Ver también:

[1] https://mozilla.github.io/server-side-tls/ssl-config-generator/ – Sugiere configuraciones de seguridad

[2] https://www.ssllabs.com/ssltest/index.html – Prueba la configuración SSL de tu servidor

Visite http://ssllabs.com y verifique su sitio según las instrucciones. Luego le dirán lo que está mal y también cómo solucionarlo. Es casi seguro que tendrá que eliminar las suites RC4, pero el sitio le dirá que no confíe en mí.

Su conexión al sitio web está encriptada con criptografía obsoleta …
Algún consejo, por favor?

El SSLCipherSuite de HIGH:MEDIUM:!aNULL:!MD5 no está mal. Debería cambiarlo a HIGH:!aNULL:!MD5:!RC4 porque MEDIUM es débil y RC4 está débil / herido.

Los navegadores se están moviendo para marcar / advertir sobre el uso de RC4. Ver, por ejemplo, las afirmaciones de información de conexión RC4 es “de alto grado”


Si solo desea utilizar claves efímeras o temporales de Diffie-Hellman (que debería), también debe eliminar el transporte de clave RSA:

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

Y como señaló Anand, debe deshabilitar SSLv2 y SSLv3:

 SSLProtocol all -SSLv2 -SSLv3 

Relacionado, puede obtener una lista de las suites de cifrado habilitadas en función de la cadena que está utilizando con el comando de openssl ciphers . Como no está utilizando DSS, SRP o PSK, puede incluso incluir !DSS:!DSA:!SRP:!PSK en la cadena.

 $ 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