root/lib/cyborghood/mail.rb @ 44648f83
| d32ee48a | Marc Dequenes | #--
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# CyborgHood, a distributed system management software.
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# Copyright (c) 2009 Marc Dequènes (Duck) <Duck@DuckCorp.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#++
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| 30406d66 | Marc Dequenes | ||
# add Rails load path for Debian, until rails framework is split properly
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| a051c3cd | Marc Dequenes | DEB_RAILS_PATH = "/usr/share/rails" unless Object.constants.include?("DEB_RAILS_PATH")
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| 30406d66 | Marc Dequenes | Dir.new(DEB_RAILS_PATH).each do |file|
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next if file =~ /^\./
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path = File.join(DEB_RAILS_PATH, file, "lib")
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$: << path if File.directory?(path)
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end
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| bc4894ce | Marc Dequenes | require 'delegate'
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require 'tmail'
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| 861ef12d | Marc Dequenes | require 'tmail_gpg'
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| 30406d66 | Marc Dequenes | require 'action_mailer/quoting'
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require 'action_mailer/utils'
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| 275e20ec | Marc Dequenes | require 'net/smtp'
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| c7904e2c | Marc Dequenes | require 'fileutils'
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require 'digest/md5'
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| bc4894ce | Marc Dequenes | ||
| cb0d68fd | Marc Dequènes (Duck) | # This class handles RFC3156 signed/encrypted messages, validates them, and extract content properly.
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# It also implements a protection against replay attacks.
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| c427bfc7 | Marc Dequenes | module CyborgHood
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| cb0d68fd | Marc Dequènes (Duck) | class MailReport
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attr_reader :error, :warn_sender, :user, :message
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| f0a75e9c | Marc Dequènes (Duck) | ||
| cb0d68fd | Marc Dequènes (Duck) | def initialize(params = {})
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@error = params[:error]
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@warn_sender = params[:warn_sender]
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@user = params[:user]
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@message = params[:message]
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| f0a75e9c | Marc Dequènes (Duck) | ||
| cb0d68fd | Marc Dequènes (Duck) | @warn_sender = false
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| f0a75e9c | Marc Dequènes (Duck) | end
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| 5425b3f0 | Marc Dequènes (Duck) | ||
| cb0d68fd | Marc Dequènes (Duck) | def ok?
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@error.nil? and @user and @message
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| 5425b3f0 | Marc Dequènes (Duck) | end
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def warn_sender
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# send reply message if user is identified or in selected situations
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# (@warn_sender acts as an override)
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@warn_sender || @user
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end
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end
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| c427bfc7 | Marc Dequenes | class Mail < Delegator
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| 30406d66 | Marc Dequenes | include ActionMailer::Quoting
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include ActionMailer::Utils
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| ed09e1e5 | Marc Dequènes (Duck) | include I18nTranslation
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| 30406d66 | Marc Dequenes | ||
| cd6a8ef9 | Marc Dequènes (Duck) | DEFAULT_MAX_DRIFT_TIME = 3600
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| 3d444084 | Marc Dequenes | ||
| ebccdcc4 | Marc Dequènes (Duck) | attr_accessor :user, :signature_timestamp
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| 5425b3f0 | Marc Dequènes (Duck) | ||
| 30406d66 | Marc Dequenes | def initialize(msg = nil)
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| 275e20ec | Marc Dequenes | @config = Config.instance
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| 30406d66 | Marc Dequenes | if msg.nil?
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@mail = TMail::Mail.new
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| 7193ea94 | Marc Dequenes | set_custom_headers
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| ebccdcc4 | Marc Dequènes (Duck) | elsif msg.is_a? TMail::Mail
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@mail = msg
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| 30406d66 | Marc Dequenes | else
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# unquote headers and transform into TMail object
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@mail = TMail::Mail.parse(TMail::Unquoter.unquote_and_convert_to(msg, "UTF-8"))
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end
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| c427bfc7 | Marc Dequenes | end
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def __getobj__
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@mail
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end
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| cb0d68fd | Marc Dequènes (Duck) | def process
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| c7904e2c | Marc Dequenes | if is_marked?
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| eb6e0359 | Marc Dequènes (Duck) | return MailReport.new(:error => _("Replay detected."))
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| c7904e2c | Marc Dequenes | end
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| cb0d68fd | Marc Dequènes (Duck) | return process_signed() if is_pgp_signed?
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return process_encrypted() if is_pgp_encrypted?
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| 5425b3f0 | Marc Dequènes (Duck) | ||
| eb6e0359 | Marc Dequènes (Duck) | MailReport.new(:error => _("Mail not RFC3156 compliant."))
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| 960c259e | Marc Dequenes | end
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| 09b32d70 | Marc Dequenes | def create_reply
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tmail_reply = @mail.create_reply
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tmail_reply.from_addrs = TMail::Address.parse(@config.mail.from_address || self.to.first)
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reply = self.class.new(tmail_reply.to_s)
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reply.set_custom_headers
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| 5425b3f0 | Marc Dequènes (Duck) | reply.user = self.user
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| 09b32d70 | Marc Dequenes | reply
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end
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| 4311d63d | Marc Dequènes (Duck) | def create_simple_reject_reply(msg)
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reply = create_reply()
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reply.set_content_type("text", "plain", {'charset' => "utf-8"})
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| ebccdcc4 | Marc Dequènes (Duck) | reply.set_disposition("inline")
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| 4311d63d | Marc Dequènes (Duck) | reply.quoted_printable_body = msg
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reply.sign
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| 5425b3f0 | Marc Dequènes (Duck) | reply.crypt(reply.user.keyFingerPrint) unless reply.user.nil?
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| 4311d63d | Marc Dequènes (Duck) | reply
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end
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| 09b32d70 | Marc Dequenes | def set_custom_headers
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@mail['Organization'] = @config.mail.organization
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end
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def check_headers
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@mail.header.keys.each do |h|
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@mail[h] = quote_address_if_necessary(@mail[h].to_s, "utf-8")
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end
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end
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def deliver
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check_headers
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smtp_server = @config.mail.smtp_server || "localhost"
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smtp_port = @config.mail.smtp_port || 25
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smtp_from = @mail.from_addrs.collect{|a| a.address}.join(", ")
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smtp_to = @mail.to_addrs.collect{|a| a.address}
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Net::SMTP.start(smtp_server, smtp_port) do |smtp|
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smtp.send_message(@mail.to_s, smtp_from, smtp_to)
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end
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end
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def to_s
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@mail.to_s
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end
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def crypt(fingerprint)
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| c0979b3e | Marc Dequenes | @mail = @mail.create_encrypted(fingerprint)
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| 09b32d70 | Marc Dequenes | end
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def sign
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| c0979b3e | Marc Dequenes | # we don't check the uid, as their is only one signer
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@mail = @mail.create_signed(@config.mail.key_id) do |uid_hint, passphrase_info, prev_was_bad|
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| 09b32d70 | Marc Dequenes | @config.mail.key_passphrase
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end
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end
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def sign_and_crypt(fingerprint)
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| c0979b3e | Marc Dequenes | # not using sign_and_crypt(), to avoid repeating code
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| 09b32d70 | Marc Dequenes | sign()
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crypt(fingerprint)
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end
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def quoted_printable_body=(txt)
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@mail.transfer_encoding = "quoted-printable"
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| 1edda628 | Marc Dequènes (Duck) | @mail.body = [normalize_new_lines(txt)].pack("M")
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| 09b32d70 | Marc Dequenes | end
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private
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| cb0d68fd | Marc Dequènes (Duck) | def process_signed
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| 09b32d70 | Marc Dequenes | sigs_check = verify_pgp_signature()
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| eb6e0359 | Marc Dequènes (Duck) | return MailReport.new(:error => _("Mail not formatted correctly (signed part).")) if sigs_check.nil? or sigs_check.size != 1
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| 09b32d70 | Marc Dequenes | ||
sig_check = sigs_check.first
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| eb6e0359 | Marc Dequènes (Duck) | return MailReport.new(:error => _("Mail content tampered or badly signed: %{sig_err}", :sig_err => sig_check.to_s)) unless sig_check.status == 0
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| 5425b3f0 | Marc Dequènes (Duck) | ||
logger.info "Mail content was properly signed by key #{sig_check.fingerprint}"
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user = Person.find_by_fingerprint(sig_check.fingerprint)
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| eb6e0359 | Marc Dequènes (Duck) | return MailReport.new(:error => _("Mail is from an unknown person."), :warn_sender => true) if user.nil?
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| 5425b3f0 | Marc Dequènes (Duck) | ||
logger.info "Mail is from user #{user.uid} (#{user.cn})"
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self.user = user
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drift = Time.new.to_i - sig_check.timestamp.to_i
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logger.debug "Signature drift time: #{drift}"
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| cd6a8ef9 | Marc Dequènes (Duck) | unless drift.abs < (@config.mail.max_drift_time || DEFAULT_MAX_DRIFT_TIME)
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| 5425b3f0 | Marc Dequènes (Duck) | if drift > 0
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| eb6e0359 | Marc Dequènes (Duck) | return MailReport.new(:error => _("The signature was made too long ago (check your system clock). Rejected message to avoid replay attacks."), :user => user)
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| c427bfc7 | Marc Dequenes | else
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| 5425b3f0 | Marc Dequènes (Duck) | # mark message to prevent later replay of the message
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mark_processed(sig_check.timestamp)
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| eb6e0359 | Marc Dequènes (Duck) | return MailReport.new(:error => _("The signature was made in the future (check your system clock). Rejected message to avoid replay attacks."), :user => user)
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| c427bfc7 | Marc Dequenes | end
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end
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| cb0d68fd | Marc Dequènes (Duck) | logger.debug "Mail OK"
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mark_processed(self.signature_timestamp)
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| 5425b3f0 | Marc Dequènes (Duck) | signed_content = pgp_signed_part()
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# create a fake mail and chain parsing operations
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plain_mail = self.class.new(signed_content)
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plain_mail.user = self.user
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| ebccdcc4 | Marc Dequènes (Duck) | plain_mail.signature_timestamp = sig_check.timestamp
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| 5425b3f0 | Marc Dequènes (Duck) | # propagate message_id to be able to mark messages (replay protection)
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| ebccdcc4 | Marc Dequènes (Duck) | plain_mail.message_id = @mail.message_id
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| cb0d68fd | Marc Dequènes (Duck) | ||
MailReport.new(:user => user, :message => plain_mail)
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| c427bfc7 | Marc Dequenes | end
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| 275e20ec | Marc Dequenes | ||
| cb0d68fd | Marc Dequènes (Duck) | def process_encrypted
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| 960c259e | Marc Dequenes | catch :notforme do
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begin
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# block is not passed to delegate (limitation ?)
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| 09b32d70 | Marc Dequenes | clear_message = @mail.pgp_decrypt do |uid_hint, passphrase_info, prev_was_bad|
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| 960c259e | Marc Dequenes | logger.info "Mail crypted for #{uid_hint}"
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# check if requesting passphrase for the expected key
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key_id = passphrase_info.split(" ")[1]
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throw :notforme if key_id != @config.mail.key_id[-(key_id.size)..-1]
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# sending key
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@config.mail.key_passphrase
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end
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# create a fake mail and chain parsing operations
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clear_mail = self.class.new(clear_message)
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| 5425b3f0 | Marc Dequènes (Duck) | clear_mail.user = self.user
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| c7904e2c | Marc Dequenes | # propagate message_id to be able to mark messages (replay protection)
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clear_mail.message_id = @mail.message_id
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| cb0d68fd | Marc Dequènes (Duck) | return clear_mail.process
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| 960c259e | Marc Dequenes | rescue GPGME::Error, NotImplementedError => e
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raise CyberError.new(:unrecoverable, "protocol/mail", e.message)
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end
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end
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| eb6e0359 | Marc Dequènes (Duck) | MailReport.new(:error => _("Mail not formatted correctly (encrypted part)."))
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| 960c259e | Marc Dequenes | end
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| c7904e2c | Marc Dequenes | ||
def mark_dir
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| d4b5798a | Marc Dequènes (Duck) | File.join(Config::VAR_DIR, "marks")
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| c7904e2c | Marc Dequenes | end
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def mark_filename
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File.join(mark_dir(), Digest::MD5.hexdigest(self.message_id))
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end
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def mark_processed(time)
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FileUtils.mkdir_p(mark_dir())
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File.open(mark_filename(), "w") do |fp|
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fp.write self.message_id
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end
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File.utime(Time.now.to_i, time.to_i, mark_filename())
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end
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def is_marked?
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File.exists?(mark_filename())
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end
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| c427bfc7 | Marc Dequenes | end
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end
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