Class: Redwood::CryptoManager
- Includes:
- Singleton
- Defined in:
- lib/sup/crypto.rb
Defined Under Namespace
Classes: Error
Constant Summary collapse
- OUTGOING_MESSAGE_OPERATIONS =
{ sign: "Sign", sign_and_encrypt: "Sign and encrypt", encrypt: "Encrypt only" }
- KEY_PATTERN =
/(-----BEGIN PGP PUBLIC KEY BLOCK.*-----END PGP PUBLIC KEY BLOCK)/m
- KEYSERVER_URL =
"http://pool.sks-keyservers.net:11371/pks/lookup"
Instance Method Summary collapse
-
#decrypt(payload, armor = false) ⇒ Object
returns decrypted_message, status, desc, lines.
- #encrypt(from, to, payload, sign = false) ⇒ Object
- #have_crypto? ⇒ Boolean
-
#initialize ⇒ CryptoManager
constructor
A new instance of CryptoManager.
- #not_working_reason ⇒ Object
- #retrieve(fingerprint) ⇒ Object
- #sign(from, to, payload) ⇒ Object
- #sign_and_encrypt(from, to, payload) ⇒ Object
- #verified_ok?(verify_result) ⇒ Boolean
-
#verify(payload, signature, detached = true) ⇒ Object
both RubyMail::Message objects.
Methods included from Singleton
Constructor Details
#initialize ⇒ CryptoManager
Returns a new instance of CryptoManager.
59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 |
# File 'lib/sup/crypto.rb', line 59 def initialize @mutex = Mutex.new @not_working_reason = nil # test if the gpgme gem is available @gpgme_present = begin begin begin GPGME.check_version({:protocol => GPGME::PROTOCOL_OpenPGP}) rescue TypeError GPGME.check_version(nil) end true rescue GPGME::Error false rescue ArgumentError # gpgme 2.0.0 raises this due to the hash->string conversion false end rescue NameError false end unless @gpgme_present @not_working_reason = ['gpgme gem not present', 'Install the gpgme gem in order to use signed and encrypted emails'] return end # if gpg2 is available, it will start gpg-agent if required if (bin = `which gpg2`.chomp) =~ /\S/ if GPGME.respond_to?('set_engine_info') GPGME.set_engine_info GPGME::PROTOCOL_OpenPGP, bin, nil else GPGME.gpgme_set_engine_info GPGME::PROTOCOL_OpenPGP, bin, nil end else # check if the gpg-options hook uses the passphrase_callback # if it doesn't then check if gpg agent is present gpg_opts = HookManager.run("gpg-options", {:operation => "sign", :options => {}}) || {} if gpg_opts[:passphrase_callback].nil? if ENV['GPG_AGENT_INFO'].nil? @not_working_reason = ["Environment variable 'GPG_AGENT_INFO' not set, is gpg-agent running?", "If gpg-agent is running, try $ export `cat ~/.gpg-agent-info`"] return end gpg_agent_socket_file = ENV['GPG_AGENT_INFO'].split(':')[0] unless File.exist?(gpg_agent_socket_file) @not_working_reason = ["gpg-agent socket file #{gpg_agent_socket_file} does not exist"] return end s = File.stat(gpg_agent_socket_file) unless s.socket? @not_working_reason = ["gpg-agent socket file #{gpg_agent_socket_file} is not a socket"] return end end end end |
Instance Method Details
#decrypt(payload, armor = false) ⇒ Object
returns decrypted_message, status, desc, lines
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 |
# File 'lib/sup/crypto.rb', line 297 def decrypt payload, armor=false # a RubyMail::Message object return unknown_status(@not_working_reason) unless @not_working_reason.nil? gpg_opts = {:protocol => GPGME::PROTOCOL_OpenPGP} gpg_opts = HookManager.run("gpg-options", {:operation => "decrypt", :options => gpg_opts}) || gpg_opts ctx = GPGME::Ctx.new(gpg_opts) cipher_data = GPGME::Data.from_str(format_payload(payload)) if GPGME::Data.respond_to?('empty') plain_data = GPGME::Data.empty else plain_data = GPGME::Data.empty! end begin ctx.decrypt_verify(cipher_data, plain_data) rescue GPGME::Error => exc return Chunk::CryptoNotice.new(:invalid, "This message could not be decrypted", gpgme_exc_msg(exc.)) end begin sig = self.verified_ok? ctx.verify_result rescue ArgumentError => exc sig = unknown_status [gpgme_exc_msg(exc.)] end plain_data.seek(0, IO::SEEK_SET) output = plain_data.read output.transcode(Encoding::ASCII_8BIT, output.encoding) ## TODO: test to see if it is still necessary to do a 2nd run if verify ## fails. # ## check for a valid signature in an extra run because gpg aborts if the ## signature cannot be verified (but it is still able to decrypt) #sigoutput = run_gpg "#{payload_fn.path}" #sig = self.old_verified_ok? sigoutput, $? if armor msg = RMail::Message.new # Look for Charset, they are put before the base64 crypted part charsets = payload.body.split("\n").grep(/^Charset:/) if !charsets.empty? and charsets[0] =~ /^Charset: (.+)$/ output.transcode($encoding, $1) end msg.body = output else # It appears that some clients use Windows new lines - CRLF - but RMail # splits the body and header on "\n\n". So to allow the parse below to # succeed, we will convert the newlines to what RMail expects output = output.gsub(/\r\n/, "\n") # This is gross. This decrypted payload could very well be a multipart # element itself, as opposed to a simple payload. For example, a # multipart/signed element, like those generated by Mutt when encrypting # and signing a message (instead of just clearsigning the body). # Supposedly, decrypted_payload being a multipart element ought to work # out nicely because Message::multipart_encrypted_to_chunks() runs the # decrypted message through message_to_chunks() again to get any # children. However, it does not work as intended because these inner # payloads need not carry a MIME-Version header, yet they are fed to # RMail as a top-level message, for which the MIME-Version header is # required. This causes for the part not to be detected as multipart, # hence being shown as an attachment. If we detect this is happening, # we force the decrypted payload to be interpreted as MIME. msg = RMail::Parser.read output if msg.header.content_type =~ %r{^multipart/} && !msg.multipart? output = "MIME-Version: 1.0\n" + output output.fix_encoding! msg = RMail::Parser.read output end end notice = Chunk::CryptoNotice.new :valid, "This message has been decrypted for display" [notice, sig, msg] end |
#encrypt(from, to, payload, sign = false) ⇒ Object
170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 |
# File 'lib/sup/crypto.rb', line 170 def encrypt from, to, payload, sign=false return unknown_status(@not_working_reason) unless @not_working_reason.nil? gpg_opts = {:protocol => GPGME::PROTOCOL_OpenPGP, :armor => true, :textmode => true} if sign gpg_opts.merge!(gen_sign_user_opts(from)) gpg_opts.merge!({:sign => true}) end gpg_opts = HookManager.run("gpg-options", {:operation => "encrypt", :options => gpg_opts}) || gpg_opts recipients = to + [from] recipients = HookManager.run("gpg-expand-keys", { :recipients => recipients }) || recipients begin if GPGME.respond_to?('encrypt') cipher = GPGME.encrypt(recipients, format_payload(payload), gpg_opts) else crypto = GPGME::Crypto.new gpg_opts[:recipients] = recipients cipher = crypto.encrypt(format_payload(payload), gpg_opts).read end rescue GPGME::Error => exc raise Error, gpgme_exc_msg(exc.) end # if the key (or gpg-agent) is not available GPGME does not complain # but just returns a zero length string. Let's catch that if cipher.length == 0 raise Error, gpgme_exc_msg("GPG failed to generate cipher text: check that gpg-agent is running and your key is available.") end encrypted_payload = RMail::Message.new encrypted_payload.header["Content-Type"] = "application/octet-stream" encrypted_payload.header["Content-Disposition"] = 'inline; filename="msg.asc"' encrypted_payload.body = cipher control = RMail::Message.new control.header["Content-Type"] = "application/pgp-encrypted" control.header["Content-Disposition"] = "attachment" control.body = "Version: 1\n" envelope = RMail::Message.new envelope.header["Content-Type"] = 'multipart/encrypted; protocol=application/pgp-encrypted' envelope.add_part control envelope.add_part encrypted_payload envelope end |
#have_crypto? ⇒ Boolean
124 |
# File 'lib/sup/crypto.rb', line 124 def have_crypto?; @not_working_reason.nil? end |
#not_working_reason ⇒ Object
125 |
# File 'lib/sup/crypto.rb', line 125 def not_working_reason; @not_working_reason end |
#retrieve(fingerprint) ⇒ Object
369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 |
# File 'lib/sup/crypto.rb', line 369 def retrieve fingerprint require 'net/http' uri = URI($config[:keyserver_url] || KEYSERVER_URL) unless uri.scheme == "http" and not uri.host.nil? and not uri.host.empty? return "Invalid url: #{uri}" end fingerprint = "0x" + fingerprint unless fingerprint[0..1] == "0x" params = {op: "get", search: fingerprint} uri.query = URI.encode_www_form(params) begin res = Net::HTTP.get_response(uri) rescue SocketError # Host doesn't exist or we couldn't connect end return "Couldn't get key from keyserver at this address: #{uri}" unless res.is_a?(Net::HTTPSuccess) match = KEY_PATTERN.match(res.body) return "No key found" unless match && match.length > 0 GPGME::Key.import(match[0]) return nil end |
#sign(from, to, payload) ⇒ Object
127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 |
# File 'lib/sup/crypto.rb', line 127 def sign from, to, payload return unknown_status(@not_working_reason) unless @not_working_reason.nil? # We grab this from the GPG::Ctx below after signing, so that we can set # micalg in Content-Type to match the hash algorithm GPG decided to use. hash_algo = nil gpg_opts = {:protocol => GPGME::PROTOCOL_OpenPGP, :armor => true, :textmode => true} gpg_opts.merge!(gen_sign_user_opts(from)) gpg_opts = HookManager.run("gpg-options", {:operation => "sign", :options => gpg_opts}) || gpg_opts begin input = GPGME::Data.new(format_payload(payload)) output = GPGME::Data.new() GPGME::Ctx.new(gpg_opts) do |ctx| if gpg_opts[:signer] signers = GPGME::Key.find(:secret, gpg_opts[:signer], :sign) ctx.add_signer(*signers) end ctx.sign(input, output, GPGME::SIG_MODE_DETACH) hash_algo = GPGME::hash_algo_name(ctx.sign_result.signatures[0].hash_algo) end output.seek(0) sig = output.read rescue GPGME::Error => exc raise Error, gpgme_exc_msg(exc.) end # if the key (or gpg-agent) is not available GPGME does not complain # but just returns a zero length string. Let's catch that if sig.length == 0 raise Error, gpgme_exc_msg("GPG failed to generate signature: check that gpg-agent is running and your key is available.") end envelope = RMail::Message.new envelope.header["Content-Type"] = "multipart/signed; protocol=application/pgp-signature; micalg=pgp-#{hash_algo.downcase}" envelope.add_part payload signature = RMail::Message. sig, "application/pgp-signature", nil, "signature.asc" envelope.add_part signature envelope end |
#sign_and_encrypt(from, to, payload) ⇒ Object
218 219 220 |
# File 'lib/sup/crypto.rb', line 218 def sign_and_encrypt from, to, payload encrypt from, to, payload, true end |
#verified_ok?(verify_result) ⇒ Boolean
222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 |
# File 'lib/sup/crypto.rb', line 222 def verified_ok? verify_result valid = true unknown = false all_output_lines = [] all_trusted = true unknown_fingerprint = nil verify_result.signatures.each do |signature| output_lines, trusted, unknown_fingerprint = sig_output_lines signature all_output_lines << output_lines all_output_lines.flatten! all_trusted &&= trusted err_code = GPGME::gpgme_err_code(signature.status) if err_code == GPGME::GPG_ERR_BAD_SIGNATURE valid = false elsif err_code != GPGME::GPG_ERR_NO_ERROR valid = false unknown = true end end if valid || !unknown summary_line = simplify_sig_line(verify_result.signatures[0].to_s.dup, all_trusted) end if all_output_lines.length == 0 Chunk::CryptoNotice.new :valid, "Encrypted message wasn't signed", all_output_lines elsif valid if all_trusted Chunk::CryptoNotice.new(:valid, summary_line, all_output_lines) else Chunk::CryptoNotice.new(:valid_untrusted, summary_line, all_output_lines) end elsif !unknown Chunk::CryptoNotice.new(:invalid, summary_line, all_output_lines) elsif unknown_fingerprint Chunk::CryptoNotice.new(:unknown_key, "Unable to determine validity of cryptographic signature", all_output_lines, unknown_fingerprint) else unknown_status all_output_lines end end |
#verify(payload, signature, detached = true) ⇒ Object
both RubyMail::Message objects
265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 |
# File 'lib/sup/crypto.rb', line 265 def verify payload, signature, detached=true # both RubyMail::Message objects return unknown_status(@not_working_reason) unless @not_working_reason.nil? gpg_opts = {:protocol => GPGME::PROTOCOL_OpenPGP} gpg_opts = HookManager.run("gpg-options", {:operation => "verify", :options => gpg_opts}) || gpg_opts ctx = GPGME::Ctx.new(gpg_opts) sig_data = GPGME::Data.from_str signature.decode if detached signed_text_data = GPGME::Data.from_str(format_payload(payload)) plain_data = nil else signed_text_data = nil if GPGME::Data.respond_to?('empty') plain_data = GPGME::Data.empty else plain_data = GPGME::Data.empty! end end begin ctx.verify(sig_data, signed_text_data, plain_data) rescue GPGME::Error => exc return unknown_status [gpgme_exc_msg(exc.)] end begin self.verified_ok? ctx.verify_result rescue ArgumentError => exc return unknown_status [gpgme_exc_msg(exc.)] end end |