abstract class OpenSSL::SSL::Context

Overview

An SSL::Context represents a generic secure socket protocol configuration.

For both server and client applications exist more specialized subclassses SSL::Context::Server and SSL::Context::Client which need to be instantiated appropriately.

Direct Known Subclasses

Defined in:

openssl/ssl/context.cr
openssl/ssl/defaults.cr

Constant Summary

CIPHER_SUITES_INTERMEDIATE = "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256"

The list of secure ciphersuites on intermediate compatibility level as per Mozilla recommendations.

The oldest clients supported by this configuration are:

  • Firefox 27
  • Android 4.4.2
  • Chrome 31
  • Edge
  • IE 11 on Windows 7
  • Java 8u31
  • OpenSSL 1.0.1
  • Opera 20
  • Safari 9

This list represents version 5.7 of the intermediate configuration available at https://ssl-config.mozilla.org/guidelines/5.7.json.

See https://wiki.mozilla.org/Security/Server_Side_TLS for details.

CIPHER_SUITES_MODERN = "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256"

The list of secure ciphersuites on modern compatibility level as per Mozilla recommendations.

The oldest clients supported by this configuration are:

  • Firefox 63
  • Android 10.0
  • Chrome 70
  • Edge 75
  • Java 11
  • OpenSSL 1.1.1
  • Opera 57
  • Safari 12.1

This list represents version 5.7 of the modern configuration available at https://ssl-config.mozilla.org/guidelines/5.7.json.

See https://wiki.mozilla.org/Security/Server_Side_TLS for details.

CIPHER_SUITES_OLD = "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256"

The list of secure ciphersuites on old compatibility level as per Mozilla recommendations.

The oldest clients supported by this configuration are:

  • Firefox 1
  • Android 2.3
  • Chrome 1
  • Edge 12
  • IE8 on Windows XP
  • Java 6
  • OpenSSL 0.9.8
  • Opera 5
  • Safari 1

This list represents version 5.7 of the old configuration available at https://ssl-config.mozilla.org/guidelines/5.7.json.

See https://wiki.mozilla.org/Security/Server_Side_TLS for details.

CIPHERS_INTERMEDIATE = "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS"

The list of secure ciphers on intermediate compatibility level as per Mozilla recommendations.

The oldest clients supported by this configuration are:

  • Firefox 27
  • Android 4.4.2
  • Chrome 31
  • Edge
  • IE 11 on Windows 7
  • Java 8u31
  • OpenSSL 1.0.1
  • Opera 20
  • Safari 9

This list represents version 5.7 of the intermediate configuration available at https://ssl-config.mozilla.org/guidelines/5.7.json.

See https://wiki.mozilla.org/Security/Server_Side_TLS for details.

CIPHERS_MODERN = "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS"

The list of secure ciphers on modern compatibility level as per Mozilla recommendations.

The oldest clients supported by this configuration are:

  • Firefox 63
  • Android 10.0
  • Chrome 70
  • Edge 75
  • Java 11
  • OpenSSL 1.1.1
  • Opera 57
  • Safari 12.1

This list represents version 5.7 of the modern configuration available at https://ssl-config.mozilla.org/guidelines/5.7.json.

See https://wiki.mozilla.org/Security/Server_Side_TLS for details.

CIPHERS_OLD = "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS"

The list of secure ciphers on old compatibility level as per Mozilla recommendations.

The oldest clients supported by this configuration are:

  • Firefox 1
  • Android 2.3
  • Chrome 1
  • Edge 12
  • IE8 on Windows XP
  • Java 6
  • OpenSSL 0.9.8
  • Opera 5
  • Safari 1

This list represents version 5.7 of the old configuration available at https://ssl-config.mozilla.org/guidelines/5.7.json.

See https://wiki.mozilla.org/Security/Server_Side_TLS for details.

Instance Method Summary

Instance methods inherited from class Reference

==(other : self)
==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup, hash(hasher) hash, initialize initialize, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference) : Bool
same?(other : Nil) same?, to_s(io : IO) : Nil to_s

Constructor methods inherited from class Reference

new new

Instance methods inherited from class Object

! : Bool !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, as(type : Class) as, as?(type : Class) as?, class class, dup dup, hash(hasher)
hash hash, in?(collection : Object) : Bool
in?(*values : Object) : Bool in?, inspect(io : IO) : Nil
inspect : String inspect, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, not_nil!(message)
not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, responds_to?(name : Symbol) : Bool responds_to?, tap(&) tap, to_json(io : IO) : Nil
to_json : String to_json, to_pretty_json(indent : String = " ") : String
to_pretty_json(io : IO, indent : String = " ") : Nil to_pretty_json, to_s(io : IO) : Nil
to_s : String to_s, to_yaml(io : IO) : Nil
to_yaml : String to_yaml, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

Class methods inherited from class Object

from_json(string_or_io, root : String)
from_json(string_or_io) from_json, from_yaml(string_or_io : String | IO) from_yaml

Instance Method Detail

def add_modes(mode : OpenSSL::SSL::Modes) #

Adds modes to the TLS context.


[View source]
def add_options(options : OpenSSL::SSL::Options) #

Adds options to the TLS context.

Example:

context.add_options(
  OpenSSL::SSL::Options::ALL |       # various workarounds
  OpenSSL::SSL::Options::NO_SSL_V2 | # disable overly deprecated SSLv2
  OpenSSL::SSL::Options::NO_SSL_V3   # disable deprecated SSLv3
)

[View source]
def add_x509_verify_flags(flags : OpenSSL::SSL::X509VerifyFlags) #

Sets the given OpenSSL::SSL::X509VerifyFlags in this context, additionally to the already set ones.


[View source]
def alpn_protocol=(protocol : String) #

Specifies an ALPN protocol to negotiate with the remote endpoint. This is required to negotiate HTTP/2 with browsers, since browser vendors decided not to implement HTTP/2 over insecure connections.

Example:

context.alpn_protocol = "h2"

[View source]
def ca_certificates=(file_path : String) #

Sets the path to a file containing all CA certificates, in PEM format, used to validate the peers certificate.


[View source]
def ca_certificates_path=(dir_path : String) #

Sets the path to a directory containing all CA certificates used to validate the peers certificate. The certificates should be in PEM format and the c_rehash(1) utility must have been run in the directory.


[View source]
def certificate_chain=(file_path : String) #

Specify the path to the certificate chain file to use. In server mode this is presented to the client, in client mode this used as client certificate.


[View source]
def cipher_suites=(cipher_suites : String) #

Specify a list of TLS cipher suites to use or discard.

See #security_level= for some sensible system configuration.


[View source]
def ciphers=(ciphers : String) #

Specify a list of TLS ciphers to use or discard.

This affects only TLSv1.2 and below. See #security_level= for some sensible system configuration.


[View source]
def default_verify_param=(name : String) #

Sets this context verify param to the default one of the given name.

Depending on the OpenSSL version, the available defaults are default, pkcs7, smime_sign, ssl_client and ssl_server.


[View source]
def finalize #

[View source]
def modes : LibSSL::Modes #

Returns the current modes set on the TLS context.


[View source]
def options : LibSSL::Options #

Returns the current options set on the TLS context.


[View source]
def private_key=(file_path : String) #

Specify the path to the private key to use. The key must in PEM format. The key must correspond to the entity certificate set by #certificate_chain=.


[View source]
def remove_modes(mode : OpenSSL::SSL::Modes) #

Removes modes from the TLS context.


[View source]
def remove_options(options : OpenSSL::SSL::Options) #

Removes options from the TLS context.

Example:

context.remove_options(OpenSSL::SSL::Options::NO_SSL_V3)

[View source]
def security_level : Int32 #

Returns the security level used by this TLS context.


[View source]
def security_level=(value : Int32) #

Sets the security level used by this TLS context. The default system security level might disable some ciphers.

  • https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_security_level.html
  • https://wiki.debian.org/ContinuousIntegration/TriagingTips/openssl-1.1.1

[View source]
def set_default_verify_paths #

Sets the default paths for #ca_certificates= and #ca_certificates_path=.


[View source]
def set_intermediate_ciphers #

Sets the current ciphers and ciphers suites to intermediate compatibility level as per Mozilla recommendations. See CIPHERS_INTERMEDIATE and CIPHER_SUITES_INTERMEDIATE. See #security_level= for some sensible system configuration.


[View source]
def set_modern_ciphers #

Sets the current ciphers and ciphers suites to modern compatibility level as per Mozilla recommendations. See CIPHERS_MODERN and CIPHER_SUITES_MODERN. See #security_level= for some sensible system configuration.


[View source]
def set_old_ciphers #

Sets the current ciphers and ciphers suites to old compatibility level as per Mozilla recommendations. See CIPHERS_OLD and CIPHER_SUITES_OLD. See #security_level= for some sensible system configuration.


[View source]
def set_tmp_ecdh_key(curve = LibCrypto::NID_X9_62_prime256v1) : Nil #

Adds a temporary ECDH key curve to the TLS context. This is required to enable the EECDH cipher suites. By default the prime256 curve will be used.


[View source]
def to_unsafe : LibSSL::SSLContext #

[View source]
def verify_mode : LibSSL::VerifyMode #

Returns the current verify mode. See the SSL_CTX_set_verify(3) manpage for more details.


[View source]
def verify_mode=(mode : OpenSSL::SSL::VerifyMode) #

Sets the verify mode. See the SSL_CTX_set_verify(3) manpage for more details.


[View source]