tweaked timeouts, handle DNSSEC check errors
This commit is contained in:
Riccardo Spagni
parent
fec7579043
commit
714db0f5a1
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@ -1,5 +1,6 @@
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from electrum_gui.qt.util import EnterButton
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from electrum.plugins import BasePlugin, hook
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from electrum.util import print_msg
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from electrum.i18n import _
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from PyQt4.QtGui import *
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from PyQt4.QtCore import *
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@ -43,6 +44,7 @@ class Plugin(BasePlugin):
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return OA_READY
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def __init__(self, gui, name):
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print_msg('[OA] Initialiasing OpenAlias plugin, OA_READY is ' + str(OA_READY))
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BasePlugin.__init__(self, gui, name)
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self._is_available = OA_READY
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@ -82,9 +84,12 @@ class Plugin(BasePlugin):
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if not data:
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return True
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(address, name) = data
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self.win.payto_e.setText(address)
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if not self.validate_dnssec(url):
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msgBox = QMessageBox()
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msgBox.setText(_('No valid DNSSEC trust chain!'))
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msgBox.setText(_('WARNING: the address ' + address + ' could not be validated via an additional security check, DNSSEC, and thus may not be correct.'))
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msgBox.setInformativeText(_('Do you wish to continue?'))
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msgBox.setStandardButtons(QMessageBox.Cancel | QMessageBox.Ok)
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msgBox.setDefaultButton(QMessageBox.Cancel)
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@ -92,8 +97,6 @@ class Plugin(BasePlugin):
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if reply != QMessageBox.Ok:
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return True
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(address, name) = data
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self.win.payto_e.setText(address)
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if self.config.get('openalias_autoadd') == 'checked':
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self.win.wallet.add_contact(address, name)
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return False
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@ -150,9 +153,11 @@ class Plugin(BasePlugin):
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if not data:
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return
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(address, name) = data
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if not self.validate_dnssec(url):
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msgBox = QMessageBox()
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msgBox.setText("No valid DNSSEC trust chain!")
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msgBox.setText(_('WARNING: the address ' + address + ' could not be validated via an additional security check, DNSSEC, and thus may not be correct.'))
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msgBox.setInformativeText("Do you wish to continue?")
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msgBox.setStandardButtons(QMessageBox.Cancel | QMessageBox.Ok)
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msgBox.setDefaultButton(QMessageBox.Cancel)
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@ -160,8 +165,6 @@ class Plugin(BasePlugin):
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if reply != QMessageBox.Ok:
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return
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(address, name) = data
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d2 = QDialog(self.win)
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vbox2 = QVBoxLayout(d2)
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grid2 = QGridLayout()
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@ -196,15 +199,17 @@ class Plugin(BasePlugin):
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def resolve(self, url):
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'''Resolve OpenAlias address using url.'''
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print_msg('[OA] Attempting to resolve OpenAlias data for ' + url)
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prefix = 'btc'
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retries = 3
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err = None
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for i in range(0, retries):
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try:
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resolver = dns.resolver.Resolver()
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resolver.timeout = 15.0
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resolver.lifetime = 15.0
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records = resolver.query(url, 'TXT')
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resolver.timeout = 2.0
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resolver.lifetime = 2.0
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records = resolver.query(url, dns.rdatatype.TXT)
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for record in records:
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string = record.strings[0]
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if string.startswith('oa1:' + prefix):
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@ -215,10 +220,10 @@ class Plugin(BasePlugin):
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return (address, name)
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QMessageBox.warning(self.win, _('Error'), _('No OpenAlias record found.'), _('OK'))
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return 0
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except resolver.NXDOMAIN:
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except dns.resolver.NXDOMAIN:
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err = _('No such domain.')
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continue
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except resolver.Timeout:
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except dns.resolver.Timeout:
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err = _('Timed out while resolving.')
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continue
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except DNSException:
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@ -240,48 +245,53 @@ class Plugin(BasePlugin):
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return None
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def validate_dnssec(self, url):
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default = dns.resolver.get_default_resolver()
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ns = default.nameservers[0]
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parts = url.split('.')
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for i in xrange(len(parts), 0, -1):
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sub = '.'.join(parts[i - 1:])
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query = dns.message.make_query(sub, dns.rdatatype.NS)
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response = dns.query.udp(query, ns, 5)
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if response.rcode() != dns.rcode.NOERROR:
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return 0
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if len(response.authority) > 0:
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rrset = response.authority[0]
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else:
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rrset = response.answer[0]
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rr = rrset[0]
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if rr.rdtype == dns.rdatatype.SOA:
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#Same server is authoritative, don't check again
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continue
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query = dns.message.make_query(sub,
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dns.rdatatype.DNSKEY,
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want_dnssec=True)
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response = dns.query.udp(query, ns, 5)
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if response.rcode() != 0:
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return 0
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# HANDLE QUERY FAILED (SERVER ERROR OR NO DNSKEY RECORD)
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# answer should contain two RRSET: DNSKEY and RRSIG(DNSKEY)
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answer = response.answer
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if len(answer) != 2:
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return 0
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# the DNSKEY should be self signed, validate it
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name = dns.name.from_text(sub)
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try:
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dns.dnssec.validate(answer[0], answer[1], {name: answer[0]})
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except dns.dnssec.ValidationFailure:
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return 0
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print_msg('[OA] Checking DNSSEC trust chain for ' + url)
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try:
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default = dns.resolver.get_default_resolver()
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ns = default.nameservers[0]
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parts = url.split('.')
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for i in xrange(len(parts), 0, -1):
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sub = '.'.join(parts[i - 1:])
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query = dns.message.make_query(sub, dns.rdatatype.NS)
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response = dns.query.udp(query, ns, 1)
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if response.rcode() != dns.rcode.NOERROR:
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return 0
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if len(response.authority) > 0:
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rrset = response.authority[0]
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else:
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rrset = response.answer[0]
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rr = rrset[0]
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if rr.rdtype == dns.rdatatype.SOA:
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#Same server is authoritative, don't check again
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continue
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query = dns.message.make_query(sub,
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dns.rdatatype.DNSKEY,
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want_dnssec=True)
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response = dns.query.udp(query, ns, 1)
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if response.rcode() != 0:
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return 0
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# HANDLE QUERY FAILED (SERVER ERROR OR NO DNSKEY RECORD)
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# answer should contain two RRSET: DNSKEY and RRSIG(DNSKEY)
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answer = response.answer
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if len(answer) != 2:
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return 0
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# the DNSKEY should be self signed, validate it
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name = dns.name.from_text(sub)
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try:
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dns.dnssec.validate(answer[0], answer[1], {name: answer[0]})
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except dns.dnssec.ValidationFailure:
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return 0
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except Exception,e:
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return 0
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return 1
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