Class: HTTPClient::SSLConfig

Inherits:
Object
  • Object
show all
Includes:
OpenSSL
Defined in:
lib/httpclient/ssl_config.rb

Overview

Represents SSL configuration for HTTPClient instance. The implementation depends on OpenSSL.

Trust Anchor Control

SSLConfig loads 'httpclient/cacert.p7s' as a trust anchor (trusted certificate(s)) with add_trust_ca in initialization time. This means that HTTPClient instance trusts some CA certificates by default, like Web browsers. 'httpclient/cacert.p7s' is created by the author and included in released package.

'cacert.p7s' is automatically generated from JDK 1.6. Regardless its filename extension (p7s), HTTPClient doesn't verify the signature in it.

You may want to change trust anchor by yourself. Call clear_cert_store then add_trust_ca for that purpose.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(client) ⇒ SSLConfig

Creates a SSLConfig.


82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
# File 'lib/httpclient/ssl_config.rb', line 82

def initialize(client)
  return unless SSLEnabled
  @client = client
  @cert_store = X509::Store.new
  @client_cert = @client_key = @client_ca = nil
  @verify_mode = SSL::VERIFY_PEER | SSL::VERIFY_FAIL_IF_NO_PEER_CERT
  @verify_depth = nil
  @verify_callback = nil
  @dest = nil
  @timeout = nil
  @ssl_version = :auto
  # Follow ruby-ossl's definition
  @options = OpenSSL::SSL::OP_ALL
  @options &= ~OpenSSL::SSL::OP_DONT_INSERT_EMPTY_FRAGMENTS if defined?(OpenSSL::SSL::OP_DONT_INSERT_EMPTY_FRAGMENTS)
  @options |= OpenSSL::SSL::OP_NO_COMPRESSION if defined?(OpenSSL::SSL::OP_NO_COMPRESSION)
  @options |= OpenSSL::SSL::OP_NO_SSLv2 if defined?(OpenSSL::SSL::OP_NO_SSLv2)
  @options |= OpenSSL::SSL::OP_NO_SSLv3 if defined?(OpenSSL::SSL::OP_NO_SSLv3)
  # OpenSSL 0.9.8 default: "ALL:!ADH:!LOW:!EXP:!MD5:+SSLv2:@STRENGTH"
  @ciphers = "ALL:!aNULL:!eNULL:!SSLv2" # OpenSSL >1.0.0 default
  @cacerts_loaded = false
end

Instance Attribute Details

#cert_storeObject

OpenSSL::X509::X509::Store used for verification. You can reset the store with clear_cert_store and set the new store with cert_store=.


76
77
78
# File 'lib/httpclient/ssl_config.rb', line 76

def cert_store
  @cert_store
end

#ciphersObject

A String of OpenSSL's cipher configuration. Default value is ALL:!ADH:!LOW:!EXP:!MD5:+SSLv2:@STRENGTH See ciphers(1) man in OpenSSL for more detail.


72
73
74
# File 'lib/httpclient/ssl_config.rb', line 72

def ciphers
  @ciphers
end

#client_caObject

For server side configuration. Ignore this.


79
80
81
# File 'lib/httpclient/ssl_config.rb', line 79

def client_ca
  @client_ca
end

#client_certObject

OpenSSL::X509::Certificate

certificate for SSL client authenticateion.

nil by default. (no client authenticateion)


47
48
49
# File 'lib/httpclient/ssl_config.rb', line 47

def client_cert
  @client_cert
end

#client_keyObject

OpenSSL::PKey::PKey

private key for SSL client authentication.

nil by default. (no client authenticateion)


50
51
52
# File 'lib/httpclient/ssl_config.rb', line 50

def client_key
  @client_key
end

#optionsObject

A number of OpenSSL's SSL options. Default value is OpenSSL::SSL::OP_ALL | OpenSSL::SSL::OP_NO_SSLv2


68
69
70
# File 'lib/httpclient/ssl_config.rb', line 68

def options
  @options
end

#ssl_versionObject

Which TLS protocol version (also called method) will be used. Defaults to :auto which means that OpenSSL decides (In my tests this resulted with always the highest available protocol being used). String name of OpenSSL's SSL version method name: TLSv1_2, TLSv1_1, TLSv1, SSLv2, SSLv23, SSLv3 or :auto (and nil) to allow version negotiation (default). See OpenSSL::SSL::SSLContext::METHODS for a list of available versions in your specific Ruby environment.


44
45
46
# File 'lib/httpclient/ssl_config.rb', line 44

def ssl_version
  @ssl_version
end

#timeoutObject

SSL timeout in sec. nil by default.


65
66
67
# File 'lib/httpclient/ssl_config.rb', line 65

def timeout
  @timeout
end

#verify_callbackObject

A callback handler for custom certificate verification. nil by default. If the handler is set, handler.call is invoked just after general OpenSSL's verification. handler.call is invoked with 2 arguments, ok and ctx; ok is a result of general OpenSSL's verification. ctx is a OpenSSL::X509::StoreContext.


63
64
65
# File 'lib/httpclient/ssl_config.rb', line 63

def verify_callback
  @verify_callback
end

#verify_depthObject

A number of verify depth. Certification path which length is longer than this depth is not allowed.


57
58
59
# File 'lib/httpclient/ssl_config.rb', line 57

def verify_depth
  @verify_depth
end

#verify_modeObject

A number which represents OpenSSL's verify mode. Default value is OpenSSL::SSL::VERIFY_PEER | OpenSSL::SSL::VERIFY_FAIL_IF_NO_PEER_CERT.


54
55
56
# File 'lib/httpclient/ssl_config.rb', line 54

def verify_mode
  @verify_mode
end

Instance Method Details

#add_crl(crl) ⇒ Object Also known as: set_crl

Adds CRL for verification.

crl

a OpenSSL::X509::CRL or a filename of a PEM/DER formatted OpenSSL::X509::CRL.

Calling this method resets all existing sessions.


215
216
217
218
219
220
221
222
# File 'lib/httpclient/ssl_config.rb', line 215

def add_crl(crl)
  unless crl.is_a?(X509::CRL)
    crl = X509::CRL.new(File.open(crl) { |f| f.read })
  end
  @cert_store.add_crl(crl)
  @cert_store.flags = X509::V_FLAG_CRL_CHECK | X509::V_FLAG_CRL_CHECK_ALL
  change_notify
end

#add_trust_ca(trust_ca_file_or_hashed_dir) ⇒ Object Also known as: set_trust_ca

Sets trust anchor certificate(s) for verification.

trust_ca_file_or_hashed_dir

a filename of a PEM/DER formatted OpenSSL::X509::Certificate or a 'c-rehash'eddirectory name which stores trusted certificate files.

Calling this method resets all existing sessions.


188
189
190
191
192
# File 'lib/httpclient/ssl_config.rb', line 188

def add_trust_ca(trust_ca_file_or_hashed_dir)
  @cacerts_loaded = true # avoid lazy override
  add_trust_ca_to_store(@cert_store, trust_ca_file_or_hashed_dir)
  change_notify
end

#add_trust_ca_to_store(cert_store, trust_ca_file_or_hashed_dir) ⇒ Object


195
196
197
198
199
200
201
# File 'lib/httpclient/ssl_config.rb', line 195

def add_trust_ca_to_store(cert_store, trust_ca_file_or_hashed_dir)
  if FileTest.directory?(trust_ca_file_or_hashed_dir)
    cert_store.add_path(trust_ca_file_or_hashed_dir)
  else
    cert_store.add_file(trust_ca_file_or_hashed_dir)
  end
end

#clear_cert_storeObject

Drops current certificate store (OpenSSL::X509::Store) for SSL and create new one for the next session.

Calling this method resets all existing sessions.


165
166
167
168
169
# File 'lib/httpclient/ssl_config.rb', line 165

def clear_cert_store
  @cacerts_loaded = true # avoid lazy override
  @cert_store = X509::Store.new
  change_notify
end

#default_verify_callback(is_ok, ctx) ⇒ Object

Default callback for verification: only dumps error.


330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
# File 'lib/httpclient/ssl_config.rb', line 330

def default_verify_callback(is_ok, ctx)
  if $DEBUG
    if is_ok
      warn("ok: #{ctx.current_cert.subject.to_s.dump}")
    else
      warn("ng: #{ctx.current_cert.subject.to_s.dump} at depth #{ctx.error_depth} - #{ctx.error}: #{ctx.error_string} in #{ctx.chain.inspect}")
    end
    warn(ctx.current_cert.to_text)
    warn(ctx.current_cert.to_pem)
  end
  if !is_ok
    depth = ctx.error_depth
    code = ctx.error
    msg = ctx.error_string
    warn("at depth #{depth} - #{code}: #{msg}") if $DEBUG
  end
  is_ok
end

#load_trust_caObject

Loads default trust anchors. Calling this method resets all existing sessions.


205
206
207
208
# File 'lib/httpclient/ssl_config.rb', line 205

def load_trust_ca
  load_cacerts(@cert_store)
  change_notify
end

#post_connection_check(peer_cert, hostname) ⇒ Object

post connection check proc for ruby < 1.8.5. this definition must match with the one in ext/openssl/lib/openssl/ssl.rb

Raises:

  • (SSL::SSLError)

302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
# File 'lib/httpclient/ssl_config.rb', line 302

def post_connection_check(peer_cert, hostname) # :nodoc:
  check_common_name = true
  cert = peer_cert
  cert.extensions.each{|ext|
    next if ext.oid != "subjectAltName"
    ext.value.split(/,\s+/).each{|general_name|
      if /\ADNS:(.*)/ =~ general_name
        check_common_name = false
        reg = Regexp.escape($1).gsub(/\\\*/, "[^.]+")
        return true if /\A#{reg}\z/i =~ hostname
      elsif /\AIP Address:(.*)/ =~ general_name
        check_common_name = false
        return true if $1 == hostname
      end
    }
  }
  if check_common_name
    cert.subject.to_a.each{|oid, value|
      if oid == "CN"
        reg = Regexp.escape(value).gsub(/\\\*/, "[^.]+")
        return true if /\A#{reg}\z/i =~ hostname
      end
    }
  end
  raise SSL::SSLError, "hostname was not match with the server certificate"
end

#sample_verify_callback(is_ok, ctx) ⇒ Object

Sample callback method: CAUTION: does not check CRL/ARL.


350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
# File 'lib/httpclient/ssl_config.rb', line 350

def sample_verify_callback(is_ok, ctx)
  unless is_ok
    depth = ctx.error_depth
    code = ctx.error
    msg = ctx.error_string
    warn("at depth #{depth} - #{code}: #{msg}") if $DEBUG
    return false
  end

  cert = ctx.current_cert
  self_signed = false
  ca = false
  pathlen = nil
  server_auth = true
  self_signed = (cert.subject.cmp(cert.issuer) == 0)

  # Check extensions whatever its criticality is. (sample)
  cert.extensions.each do |ex|
    case ex.oid
    when 'basicConstraints'
      /CA:(TRUE|FALSE), pathlen:(\d+)/ =~ ex.value
      ca = ($1 == 'TRUE')
      pathlen = $2.to_i
    when 'keyUsage'
      usage = ex.value.split(/\s*,\s*/)
      ca = usage.include?('Certificate Sign')
      server_auth = usage.include?('Key Encipherment')
    when 'extendedKeyUsage'
      usage = ex.value.split(/\s*,\s*/)
      server_auth = usage.include?('Netscape Server Gated Crypto')
    when 'nsCertType'
      usage = ex.value.split(/\s*,\s*/)
      ca = usage.include?('SSL CA')
      server_auth = usage.include?('SSL Server')
    end
  end

  if self_signed
    warn('self signing CA') if $DEBUG
    return true
  elsif ca
    warn('middle level CA') if $DEBUG
    return true
  elsif server_auth
    warn('for server authentication') if $DEBUG
    return true
  end

  return false
end

#set_client_cert_file(cert_file, key_file, pass = nil) ⇒ Object

Sets certificate and private key for SSL client authentication.

cert_file

must be a filename of PEM/DER formatted file.

key_file

must be a filename of PEM/DER formatted file. Key must be an RSA key. If you want to use other PKey algorithm, use client_key=.

Calling this method resets all existing sessions.


137
138
139
140
141
# File 'lib/httpclient/ssl_config.rb', line 137

def set_client_cert_file(cert_file, key_file, pass = nil)
  @client_cert = X509::Certificate.new(File.open(cert_file) { |f| f.read })
  @client_key = PKey::RSA.new(File.open(key_file) { |f| f.read }, pass)
  change_notify
end

#set_context(ctx) ⇒ Object

interfaces for SSLSocketWrap.


282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
# File 'lib/httpclient/ssl_config.rb', line 282

def set_context(ctx) # :nodoc:
  load_trust_ca unless @cacerts_loaded
  @cacerts_loaded = true
  # Verification: Use Store#verify_callback instead of SSLContext#verify*?
  ctx.cert_store = @cert_store
  ctx.verify_mode = @verify_mode
  ctx.verify_depth = @verify_depth if @verify_depth
  ctx.verify_callback = @verify_callback || method(:default_verify_callback)
  # SSL config
  ctx.cert = @client_cert
  ctx.key = @client_key
  ctx.client_ca = @client_ca
  ctx.timeout = @timeout
  ctx.options = @options
  ctx.ciphers = @ciphers
  ctx.ssl_version = @ssl_version unless @ssl_version == :auto
end

#set_default_pathsObject

Sets OpenSSL's default trusted CA certificates. Generally, OpenSSL is configured to use OS's trusted CA certificates located at /etc/pki/certs or /etc/ssl/certs. Unfortunately OpenSSL's Windows build does not work with Windows Certificate Storage.

On Windows or when you build OpenSSL manually, you can set the CA certificates directory by SSL_CERT_DIR env variable at runtime.

SSL_CERT_DIR=/etc/ssl/certs ruby -rhttpclient -e "..."

Calling this method resets all existing sessions.


154
155
156
157
158
159
# File 'lib/httpclient/ssl_config.rb', line 154

def set_default_paths
  @cacerts_loaded = true # avoid lazy override
  @cert_store = X509::Store.new
  @cert_store.set_default_paths
  change_notify
end