Revision 2891e0c2
Added by Marc Dequènes almost 16 years ago
- ID 2891e0c2f55f7c42efb4be061ef2545b0797289b
| lib/tmail_extra.rb | ||
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# attempt to check PGP signature in a RFC3156-compliant way
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module TMail
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class Mail
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def is_pgp_signed?
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content_type == "multipart/signed" and parts.size == 2 and parts[1].content_type == "application/pgp-signature"
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end
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def pgp_signature
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return nil unless is_pgp_signed?
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parts[1].decoded
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end
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def pgp_signed_part
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return nil unless is_pgp_signed?
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parts[0]
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end
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def verify_pgp_signature
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return nil unless is_pgp_signed?
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# using RAW part, without any decoding
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# remove last EOL due to MIME protocol and properly convert all EOL to CRLF
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content = parts[0].raw.chomp.gsub(/\r?\n/, "\r\n")
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sig = pgp_signature()
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logger.debug "Proper signed content detected"
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sig_check = nil
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GPGME::verify(sig, content) do |signature|
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sig_check = signature
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end
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sig_check
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end
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protected
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def raw
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@port.read_all
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end
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end
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end
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| postman | ||
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require 'log4r'
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require 'net/imap'
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require 'tmail'
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require 'tmail_extra'
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#require 'socket'
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#require 'fileutils'
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#require 'tempfile'
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| ... | ... | |
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#Socket.gethostname
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# needed to verify _untouched_ signed MIME part
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module TMail
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class Mail
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def raw
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@port.read_all
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end
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end
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end
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#
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# TODO:
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# - should be able to handle encrypted messages for user to send sensitive data (postman would need a GPG key too)
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| ... | ... | |
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#imap = Net::IMAP.new('imap.duckcorp.org', 993, true, "/etc/ssl/certs/duckcorp.crt", true)
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imap = Net::IMAP.new('localhost')
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logger.debug "Connected to IMAP server"
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logger.debug imap.capability()
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logger.debug "IMAP Capabilities: " + imap.capability.join(", ")
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imap.authenticate('LOGIN', @config.imap.login, @config.imap.passwd)
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logger.debug "Logged into IMAP account"
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#p imap.getquotaroot("INBOX")
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| ... | ... | |
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logger.set_prefix("[#{mail.message_id}] ")
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logger.info "#{mail.from_addrs} -> #{mail.to_addrs}: #{mail.subject}"
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# ignore mails not signed
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unless mail.content_type == "multipart/signed" and mail.parts.size == 2 and mail.parts[1].content_type == "application/pgp-signature"
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unless mail.is_pgp_signed?
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logger.info "Mail not signed or not RFC3156 compliant"
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next
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end
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content = mail.parts[0].raw.chomp.gsub(/\r?\n/, "\r\n")
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decoded_content = mail.parts[0].body
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sig = mail.parts[1].decoded
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decoded_content = mail.pgp_signed_part().body
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logger.debug "Proper signed content detected"
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GPGME::verify(sig, content) do |signature|
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if signature.status == 0
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logger.info "Mail content was properly signed by key #{signature.fingerprint}"
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list = Person.find(:all, :attribute => 'keyFingerPrint', :value => signature.fingerprint)
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case list.size
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when 0
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logger.info "Mail is from an unknow person"
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when 1
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user = list.first
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logger.info "Mail is from user #{user.uid} (#{user.cn})"
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CommandParser.run(user, decoded_content)
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else
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logger.warn "Multiple users match in database, so i guess there is a mistake. It is safer to skip..."
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end
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else
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logger.info "Mail content tampered or badly signed: " + signature.to_s
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end
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sig_check = mail.verify_pgp_signature()
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if sig_check.status == 0
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logger.info "Mail content was properly signed by key #{sig_check.fingerprint}"
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list = Person.find(:all, :attribute => 'keyFingerPrint', :value => sig_check.fingerprint)
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case list.size
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when 0
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logger.info "Mail is from an unknow person"
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when 1
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user = list.first
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logger.info "Mail is from user #{user.uid} (#{user.cn})"
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CommandParser.run(user, decoded_content)
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else
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logger.warn "Multiple users match in database, so i guess there is a mistake. It is safer to skip..."
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end
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else
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logger.info "Mail content tampered or badly signed: " + sig_check.to_s
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end
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end
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imap.logout
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Also available in: Unified diff
[evol] properly moved tmail signature handling out of postman in a library (which i should probably suggest upstream)