| 1 | #!/usr/local/bin/python |
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| 2 | |
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| 3 | import os, sys |
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| 4 | import subprocess |
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| 5 | import tempfile |
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| 6 | import logging |
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| 7 | |
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| 8 | from M2Crypto import SSL, X509, EVP |
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| 9 | from pyasn1.codec.der import decoder |
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| 10 | |
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| 11 | from xmlrpclib import Binary |
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| 12 | |
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| 13 | |
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| 14 | # The version of M2Crypto on users is pretty old and doesn't have all the |
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| 15 | # features that are useful. The legacy code is somewhat more brittle than the |
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| 16 | # main line, but will work. |
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| 17 | if "as_der" not in dir(EVP.PKey): |
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| 18 | from asn1_raw import get_key_bits_from_file, get_key_bits_from_cert |
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| 19 | legacy = True |
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| 20 | else: |
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| 21 | legacy = False |
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| 22 | |
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| 23 | class fedd_ssl_context(SSL.Context): |
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| 24 | """ |
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| 25 | Simple wrapper around an M2Crypto.SSL.Context to initialize it for fedd. |
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| 26 | """ |
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| 27 | def __init__(self, my_cert, trusted_certs=None, password=None): |
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| 28 | """ |
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| 29 | construct a fedd_ssl_context |
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| 30 | |
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| 31 | @param my_cert: PEM file with my certificate in it |
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| 32 | @param trusted_certs: PEM file with trusted certs in it (optional) |
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| 33 | """ |
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| 34 | SSL.Context.__init__(self) |
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| 35 | |
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| 36 | # load_cert takes a callback to get a password, not a password, so if |
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| 37 | # the caller provided a password, this creates a nonce callback using a |
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| 38 | # lambda form. |
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| 39 | if password != None and not callable(password): |
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| 40 | # This is cute. password = lambda *args: password produces a |
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| 41 | # function object that returns itself rather than one that returns |
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| 42 | # the object itself. This is because password is an object |
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| 43 | # reference and after the assignment it's a lambda. So we assign |
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| 44 | # to a temp. |
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| 45 | pwd = password |
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| 46 | password =lambda *args: pwd |
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| 47 | |
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| 48 | if password != None: |
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| 49 | self.load_cert(my_cert, callback=password) |
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| 50 | else: |
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| 51 | self.load_cert(my_cert) |
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| 52 | if trusted_certs != None: self.load_verify_locations(trusted_certs) |
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| 53 | self.set_verify(SSL.verify_peer, 10) |
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| 54 | |
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| 55 | class fedid: |
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| 56 | """ |
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| 57 | Wrapper around the federated ID from an X509 certificate. |
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| 58 | """ |
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| 59 | HASHSIZE=20 |
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| 60 | def __init__(self, bits=None, hexstr=None, cert=None, file=None): |
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| 61 | if bits != None: |
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| 62 | self.set_bits(bits) |
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| 63 | elif hexstr != None: |
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| 64 | self.set_hexstr(hexstr) |
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| 65 | elif cert != None: |
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| 66 | self.set_cert(cert) |
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| 67 | elif file != None: |
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| 68 | self.set_file(file) |
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| 69 | else: |
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| 70 | self.buf = None |
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| 71 | |
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| 72 | def __hash__(self): |
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| 73 | return hash(self.buf) |
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| 74 | |
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| 75 | def __eq__(self, other): |
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| 76 | if isinstance(other, type(self)): |
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| 77 | return self.buf == other.buf |
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| 78 | elif isinstance(other, type(str())): |
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| 79 | return self.buf == other; |
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| 80 | else: |
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| 81 | return False |
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| 82 | |
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| 83 | def __ne__(self, other): return not self.__eq__(other) |
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| 84 | |
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| 85 | def __str__(self): |
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| 86 | if self.buf != None: |
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| 87 | return str().join([ "%02x" % ord(x) for x in self.buf]) |
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| 88 | else: return "" |
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| 89 | |
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| 90 | def __repr__(self): |
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| 91 | return "fedid(hexstr='%s')" % self.__str__() |
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| 92 | |
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| 93 | def pack_soap(self): |
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| 94 | return self.buf |
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| 95 | |
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| 96 | def pack_xmlrpc(self): |
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| 97 | return self.buf |
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| 98 | |
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| 99 | def digest_bits(self, bits): |
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| 100 | """Internal function. Compute the fedid from bits and store in buf""" |
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| 101 | d = EVP.MessageDigest('sha1') |
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| 102 | d.update(bits) |
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| 103 | self.buf = d.final() |
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| 104 | |
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| 105 | |
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| 106 | def set_hexstr(self, hexstr): |
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| 107 | h = hexstr.replace(':','') |
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| 108 | self.buf= str().join([chr(int(h[i:i+2],16)) \ |
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| 109 | for i in range(0,2*fedid.HASHSIZE,2)]) |
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| 110 | |
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| 111 | def get_hexstr(self): |
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| 112 | """Return the hexstring representation of the fedid""" |
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| 113 | return __str__(self) |
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| 114 | |
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| 115 | def set_bits(self, bits): |
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| 116 | """Set the fedid to bits(a 160 bit buffer)""" |
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| 117 | self.buf = bits |
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| 118 | |
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| 119 | def get_bits(self): |
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| 120 | """Get the 160 bit buffer from the fedid""" |
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| 121 | return self.buf |
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| 122 | |
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| 123 | def set_file(self, file): |
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| 124 | """Get the fedid from a certificate file |
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| 125 | |
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| 126 | Calculate the SHA1 hash over the bit string of the public key as |
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| 127 | defined in RFC3280. |
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| 128 | """ |
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| 129 | self.buf = None |
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| 130 | if legacy: self.digest_bits(get_key_bits_from_file(file)) |
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| 131 | else: self.set_cert(X509.load_cert(file)) |
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| 132 | |
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| 133 | def set_cert(self, cert): |
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| 134 | """Get the fedid from a certificate. |
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| 135 | |
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| 136 | Calculate the SHA1 hash over the bit string of the public key as |
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| 137 | defined in RFC3280. |
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| 138 | """ |
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| 139 | |
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| 140 | self.buf = None |
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| 141 | if (cert != None): |
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| 142 | if legacy: |
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| 143 | self.digest_bits(get_key_bits_from_cert(cert)) |
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| 144 | else: |
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| 145 | b = [] |
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| 146 | k = cert.get_pubkey() |
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| 147 | |
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| 148 | # Getting the key was easy, but getting the bit string of the |
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| 149 | # key requires a side trip through ASN.1 |
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| 150 | dec = decoder.decode(k.as_der()) |
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| 151 | |
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| 152 | # kv is a tuple of the bits in the key. The loop below |
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| 153 | # recombines these into bytes and then into a buffer for the |
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| 154 | # SSL digest function. |
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| 155 | kv = dec[0].getComponentByPosition(1) |
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| 156 | for i in range(0, len(kv), 8): |
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| 157 | v = 0 |
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| 158 | for j in range(0, 8): |
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| 159 | v = (v << 1) + kv[i+j] |
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| 160 | b.append(v) |
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| 161 | # The comprehension turns b from a list of bytes into a buffer |
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| 162 | # (string) of bytes |
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| 163 | self.digest_bits(str().join([chr(x) for x in b])) |
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| 164 | |
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| 165 | def pack_id(id): |
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| 166 | """ |
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| 167 | Return a dictionary with the field name set by the id type. Handy for |
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| 168 | creating dictionaries to be converted to messages. |
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| 169 | """ |
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| 170 | if isinstance(id, type(fedid())): return { 'fedid': id } |
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| 171 | elif id.startswith("http:") or id.startswith("https:"): return { 'uri': id } |
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| 172 | else: return { 'localname': id} |
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| 173 | |
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| 174 | def unpack_id(id): |
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| 175 | """return id as a type determined by the key""" |
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| 176 | if id.has_key("fedid"): return fedid(id["fedid"]) |
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| 177 | else: |
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| 178 | for k in ("localname", "uri", "kerberosUsername"): |
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| 179 | if id.has_key(k): return id[k] |
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| 180 | return None |
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| 181 | |
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| 182 | def pack_soap(container, name, contents): |
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| 183 | """ |
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| 184 | Convert the dictionary in contents into a tree of ZSI classes. |
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| 185 | |
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| 186 | The holder classes are constructed from factories in container and assigned |
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| 187 | to either the element or attribute name. This is used to recursively |
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| 188 | create the SOAP message. |
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| 189 | """ |
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| 190 | if getattr(contents, "__iter__", None) != None: |
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| 191 | attr =getattr(container, "new_%s" % name, None) |
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| 192 | if attr: obj = attr() |
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| 193 | else: |
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| 194 | print dir(container) |
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| 195 | raise TypeError("%s does not have a new_%s attribute" % \ |
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| 196 | (container, name)) |
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| 197 | for e, v in contents.iteritems(): |
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| 198 | assign = getattr(obj, "set_element_%s" % e, None) or \ |
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| 199 | getattr(obj, "set_attribute_%s" % e, None) |
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| 200 | if isinstance(v, type(dict())): |
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| 201 | assign(pack_soap(obj, e, v)) |
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| 202 | elif getattr(v, "__iter__", None) != None: |
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| 203 | assign([ pack_soap(obj, e, val ) for val in v]) |
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| 204 | elif getattr(v, "pack_soap", None) != None: |
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| 205 | assign(v.pack_soap()) |
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| 206 | else: |
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| 207 | assign(v) |
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| 208 | return obj |
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| 209 | else: return contents |
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| 210 | |
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| 211 | def unpack_soap(element): |
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| 212 | """ |
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| 213 | Convert a tree of ZSI SOAP classes intro a hash. The inverse of pack_soap |
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| 214 | |
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| 215 | Elements or elements that are empty are ignored. |
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| 216 | """ |
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| 217 | methods = [ m for m in dir(element) \ |
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| 218 | if m.startswith("get_element") or m.startswith("get_attribute")] |
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| 219 | if len(methods) > 0: |
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| 220 | rv = { } |
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| 221 | for m in methods: |
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| 222 | if m.startswith("get_element_"): n = m.replace("get_element_","",1) |
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| 223 | else: n = m.replace("get_attribute_", "", 1) |
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| 224 | sub = getattr(element, m)() |
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| 225 | if sub != None: |
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| 226 | if isinstance(sub, basestring): |
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| 227 | rv[n] = sub |
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| 228 | elif getattr(sub, "__iter__", None) != None: |
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| 229 | if len(sub) > 0: rv[n] = [unpack_soap(e) for e in sub] |
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| 230 | else: |
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| 231 | rv[n] = unpack_soap(sub) |
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| 232 | return rv |
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| 233 | else: |
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| 234 | return element |
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| 235 | |
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| 236 | def encapsulate_binaries(e, tags): |
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| 237 | """Walk through a message and encapsulate any dictionary entries in |
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| 238 | tags into a binary object.""" |
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| 239 | dict_type = type(dict()) |
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| 240 | list_type = type(list()) |
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| 241 | str_type = type(str()) |
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| 242 | |
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| 243 | if isinstance(e, dict_type): |
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| 244 | for k in e.keys(): |
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| 245 | if k in tags: |
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| 246 | if isinstance(e[k], list_type): |
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| 247 | bin_list = [] |
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| 248 | for ee in e[k]: |
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| 249 | if getattr(ee, 'pack_xmlrpc', None): |
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| 250 | bin_list.append(Binary(ee.pack_xmlrpc())) |
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| 251 | else: |
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| 252 | bin_list.append(Binary(ee)) |
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| 253 | e[k] = bin_list |
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| 254 | elif getattr(e[k],'pack_xmlrpc', None): |
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| 255 | e[k] = Binary(e[k].pack_xmlrpc()) |
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| 256 | else: |
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| 257 | e[k] = Binary(e[k]) |
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| 258 | elif isinstance(e[k], dict_type): |
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| 259 | encapsulate_binaries(e[k], tags) |
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| 260 | elif isinstance(e[k], list_type): |
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| 261 | for ee in e[k]: |
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| 262 | encapsulate_binaries(ee, tags) |
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| 263 | # Other types end the recursion - they should be leaves |
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| 264 | return e |
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| 265 | |
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| 266 | def decapsulate_binaries(e, tags): |
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| 267 | """Walk through a message and encapsulate any dictionary entries in |
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| 268 | tags into a binary object.""" |
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| 269 | dict_type = type(dict()) |
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| 270 | list_type = type(list()) |
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| 271 | str_type = type(str()) |
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| 272 | |
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| 273 | if isinstance(e, dict_type): |
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| 274 | for k in e.keys(): |
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| 275 | if k in tags: |
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| 276 | if isinstance(e[k], list_type): |
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| 277 | e[k] = [ b.data for b in e[k]] |
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| 278 | else: |
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| 279 | e[k] = e[k].data |
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| 280 | elif isinstance(e[k], dict_type): |
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| 281 | decapsulate_binaries(e[k], tags) |
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| 282 | elif isinstance(e[k], list_type): |
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| 283 | for ee in e[k]: |
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| 284 | decapsulate_binaries(ee, tags) |
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| 285 | # Other types end the recursion - they should be leaves |
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| 286 | return e |
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| 287 | |
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| 288 | |
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| 289 | def generate_fedid(subj, bits=2048, log=None, dir=None, trace=sys.stderr): |
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| 290 | """ |
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| 291 | Create a new certificate and derive a fedid from it. |
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| 292 | |
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| 293 | The fedid and the certificte are returned as a tuple. |
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| 294 | """ |
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| 295 | |
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| 296 | keypath = None |
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| 297 | certpath = None |
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| 298 | try: |
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| 299 | try: |
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| 300 | kd, keypath = tempfile.mkstemp(dir=dir, prefix="key", |
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| 301 | suffix=".pem") |
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| 302 | cd, certpath = tempfile.mkstemp(dir=dir, prefix="cert", |
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| 303 | suffix=".pem") |
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| 304 | |
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| 305 | cmd = ["/usr/bin/openssl", "req", "-text", "-newkey", |
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| 306 | "rsa:%d" % bits, "-keyout", keypath, "-nodes", |
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| 307 | "-subj", "/CN=%s" % subj, "-x509", "-days", "30", |
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| 308 | "-out", certpath] |
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| 309 | |
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| 310 | if log: |
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| 311 | log.debug("[generate_fedid] %s" % " ".join(cmd)) |
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| 312 | |
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| 313 | if trace: call_out = trace |
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| 314 | else: |
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| 315 | log.debug("set to dev/null") |
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| 316 | call_out = open("/dev/null", "w") |
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| 317 | |
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| 318 | rv = subprocess.call(cmd, stdout=call_out, stderr=call_out) |
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| 319 | log.debug("rv = %d" % rv) |
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| 320 | if rv == 0: |
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| 321 | cert = "" |
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| 322 | for p in (certpath, keypath): |
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| 323 | f = open(p) |
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| 324 | for line in f: |
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| 325 | cert += line |
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| 326 | |
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| 327 | fid = fedid(file=certpath) |
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| 328 | return (fid, cert) |
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| 329 | else: |
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| 330 | return (None, None) |
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| 331 | except IOError, e: |
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| 332 | raise e |
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| 333 | finally: |
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| 334 | if keypath: os.remove(keypath) |
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| 335 | if certpath: os.remove(certpath) |
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| 336 | |
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| 337 | |
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| 338 | def make_soap_handler(typecode, method, constructor, body_name): |
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| 339 | """ |
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| 340 | Generate the handler code to unpack and pack SOAP requests and responses |
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| 341 | and call the given method. |
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| 342 | |
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| 343 | The code to decapsulate and encapsulate parameters encoded in SOAP is the |
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| 344 | same modulo a few parameters. This is basically a stub compiler for |
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| 345 | calling a fedd service trhough a soap interface. The parameters are the |
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| 346 | typecode of the request parameters, the method to call (usually a bound |
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| 347 | instance of a method on a fedd service providing class), the constructor of |
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| 348 | a response packet and the name of the body element of that packet. The |
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| 349 | handler takes a ParsedSoap object (the request) and returns an instance of |
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| 350 | the class created by constructor containing the response. Failures of the |
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| 351 | constructor or badly created constructors will result in None being |
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| 352 | returned. |
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| 353 | """ |
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| 354 | def handler(ps, fid): |
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| 355 | req = ps.Parse(typecode) |
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| 356 | |
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| 357 | msg = method(unpack_soap(req), fedid) |
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| 358 | |
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| 359 | resp = constructor() |
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| 360 | set_element = getattr(resp, "set_element_%s" % body_name, None) |
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| 361 | if set_element and callable(set_element): |
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| 362 | try: |
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| 363 | set_element(pack_soap(resp, body_name, msg)) |
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| 364 | return resp |
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| 365 | except (NameError, TypeError): |
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| 366 | return None |
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| 367 | else: |
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| 368 | return None |
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| 369 | |
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| 370 | return handler |
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| 371 | |
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| 372 | def make_xmlrpc_handler(method, body_name, input_binaries=('fedid',), |
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| 373 | output_binaries=('fedid',)): |
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| 374 | """ |
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| 375 | Generate the handler code to unpack and pack SOAP requests and responses |
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| 376 | and call the given method. |
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| 377 | |
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| 378 | The code to marshall and unmarshall XMLRPC parameters to and from a fedd |
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| 379 | service is largely the same. This helper creates such a handler. The |
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| 380 | parameters are the method name, the name of the body struct that contains |
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| 381 | the response asn the list of fields that are encoded as Binary objects in |
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| 382 | the input and in the output. A handler is created that takes the params |
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| 383 | response from an xm,lrpclib.loads on the incoming rpc and a fedid and |
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| 384 | responds with a hash representing the struct ro be returned to the other |
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| 385 | side. On error None is returned. |
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| 386 | """ |
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| 387 | def handler(params, fid): |
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| 388 | p = decapsulate_binaries(params[0], input_binaries) |
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| 389 | msg = method(p, fedid) |
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| 390 | |
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| 391 | if msg != None: |
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| 392 | return encapsulate_binaries({ body_name: msg }, output_binaries) |
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| 393 | else: |
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| 394 | return None |
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| 395 | |
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| 396 | return handler |
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| 397 | |
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| 398 | def set_log_level(config, sect, log): |
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| 399 | """ Set the logging level to the value passed in sect of config.""" |
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| 400 | # The getattr sleight of hand finds the logging level constant |
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| 401 | # corrersponding to the string. We're a little paranoid to avoid user |
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| 402 | # mayhem. |
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| 403 | if config.has_option(sect, "log_level"): |
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| 404 | level_str = config.get(sect, "log_level") |
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| 405 | try: |
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| 406 | level = int(getattr(logging, level_str.upper(), -1)) |
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| 407 | |
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| 408 | if logging.DEBUG <= level <= logging.CRITICAL: |
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| 409 | log.setLevel(level) |
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| 410 | else: |
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| 411 | log.error("Bad experiment_log value: %s" % level_str) |
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| 412 | |
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| 413 | except ValueError: |
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| 414 | log.error("Bad experiment_log value: %s" % level_str) |
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| 415 | |
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