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# Copyright (C) 2004-2007, 2009, 2010 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import struct
import dns.exception
import dns.dnssec
import dns.rdata
_flags_from_text = {
'NOCONF': (0x4000, 0xC000),
'NOAUTH': (0x8000, 0xC000),
'NOKEY': (0xC000, 0xC000),
'FLAG2': (0x2000, 0x2000),
'EXTEND': (0x1000, 0x1000),
'FLAG4': (0x0800, 0x0800),
'FLAG5': (0x0400, 0x0400),
'USER': (0x0000, 0x0300),
'ZONE': (0x0100, 0x0300),
'HOST': (0x0200, 0x0300),
'NTYP3': (0x0300, 0x0300),
'FLAG8': (0x0080, 0x0080),
'FLAG9': (0x0040, 0x0040),
'FLAG10': (0x0020, 0x0020),
'FLAG11': (0x0010, 0x0010),
'SIG0': (0x0000, 0x000f),
'SIG1': (0x0001, 0x000f),
'SIG2': (0x0002, 0x000f),
'SIG3': (0x0003, 0x000f),
'SIG4': (0x0004, 0x000f),
'SIG5': (0x0005, 0x000f),
'SIG6': (0x0006, 0x000f),
'SIG7': (0x0007, 0x000f),
'SIG8': (0x0008, 0x000f),
'SIG9': (0x0009, 0x000f),
'SIG10': (0x000a, 0x000f),
'SIG11': (0x000b, 0x000f),
'SIG12': (0x000c, 0x000f),
'SIG13': (0x000d, 0x000f),
'SIG14': (0x000e, 0x000f),
'SIG15': (0x000f, 0x000f),
}
_protocol_from_text = {
'NONE' : 0,
'TLS' : 1,
'EMAIL' : 2,
'DNSSEC' : 3,
'IPSEC' : 4,
'ALL' : 255,
}
class KEYBase(dns.rdata.Rdata):
"""KEY-like record base
@ivar flags: the key flags
@type flags: int
@ivar protocol: the protocol for which this key may be used
@type protocol: int
@ivar algorithm: the algorithm used for the key
@type algorithm: int
@ivar key: the public key
@type key: string"""
__slots__ = ['flags', 'protocol', 'algorithm', 'key']
def __init__(self, rdclass, rdtype, flags, protocol, algorithm, key):
super(KEYBase, self).__init__(rdclass, rdtype)
self.flags = flags
self.protocol = protocol
self.algorithm = algorithm
self.key = key
def to_text(self, origin=None, relativize=True, **kw):
return '%d %d %d %s' % (self.flags, self.protocol, self.algorithm,
dns.rdata._base64ify(self.key))
def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
flags = tok.get_string()
if flags.isdigit():
flags = int(flags)
else:
flag_names = flags.split('|')
flags = 0
for flag in flag_names:
v = _flags_from_text.get(flag)
if v is None:
raise dns.exception.SyntaxError('unknown flag %s' % flag)
flags &= ~v[1]
flags |= v[0]
protocol = tok.get_string()
if protocol.isdigit():
protocol = int(protocol)
else:
protocol = _protocol_from_text.get(protocol)
if protocol is None:
raise dns.exception.SyntaxError('unknown protocol %s' % protocol)
algorithm = dns.dnssec.algorithm_from_text(tok.get_string())
chunks = []
while 1:
t = tok.get().unescape()
if t.is_eol_or_eof():
break
if not t.is_identifier():
raise dns.exception.SyntaxError
chunks.append(t.value)
b64 = ''.join(chunks)
key = b64.decode('base64_codec')
return cls(rdclass, rdtype, flags, protocol, algorithm, key)
from_text = classmethod(from_text)
def to_wire(self, file, compress = None, origin = None):
header = struct.pack("!HBB", self.flags, self.protocol, self.algorithm)
file.write(header)
file.write(self.key)
def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
if rdlen < 4:
raise dns.exception.FormError
header = struct.unpack('!HBB', wire[current : current + 4])
current += 4
rdlen -= 4
key = wire[current : current + rdlen]
return cls(rdclass, rdtype, header[0], header[1], header[2],
key)
from_wire = classmethod(from_wire)
def _cmp(self, other):
hs = struct.pack("!HBB", self.flags, self.protocol, self.algorithm)
ho = struct.pack("!HBB", other.flags, other.protocol, other.algorithm)
v = cmp(hs, ho)
if v == 0:
v = cmp(self.key, other.key)
return v
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