| 1 | #/usr/local/bin/python |
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| 2 | |
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| 3 | from tempfile import mkstemp |
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| 4 | from subprocess import call |
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| 5 | from threading import Lock |
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| 6 | |
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| 7 | from string import join, hexdigits |
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| 8 | |
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| 9 | from deter import fedid |
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| 10 | from remote_service import service_caller |
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| 11 | from service_error import service_error |
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| 12 | from util import abac_pem_type, abac_split_cert |
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| 13 | from proof import proof |
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| 14 | |
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| 15 | |
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| 16 | import ABAC |
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| 17 | import pickle |
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| 18 | |
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| 19 | import sys |
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| 20 | import os, os.path |
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| 21 | import re |
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| 22 | import fcntl |
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| 23 | |
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| 24 | class authorizer_base: |
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| 25 | """ |
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| 26 | Classes based on this one keep track of authorization attributes for the |
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| 27 | various modules running. This base class holds some utility functions that |
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| 28 | they all potentially use. |
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| 29 | """ |
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| 30 | |
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| 31 | # general error exception for badly formed names. |
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| 32 | class bad_name(RuntimeError): pass |
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| 33 | # difficulty creating an attribute |
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| 34 | class attribute_error(RuntimeError): pass |
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| 35 | |
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| 36 | @staticmethod |
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| 37 | def auth_name(name): |
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| 38 | """ |
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| 39 | Helper to convert a non-unicode local name to a unicode string. Mixed |
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| 40 | representations can needlessly confuse the authorizer. |
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| 41 | """ |
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| 42 | if isinstance(name, basestring): |
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| 43 | if not isinstance(name, unicode): return unicode(name) |
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| 44 | else: return name |
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| 45 | else: return name |
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| 46 | |
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| 47 | @staticmethod |
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| 48 | def valid_name(name): |
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| 49 | """ |
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| 50 | Ensure that the given name is valid. A valid name can either be a |
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| 51 | triple of strings and fedids representing one of our generalized Emulab |
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| 52 | names or a single fedid. Compound names can include wildcards (None) |
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| 53 | and must anchor to a fedid at their highest level (unless they're all |
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| 54 | None) |
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| 55 | |
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| 56 | This either returns True or throws an exception. More an assertion |
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| 57 | than a function. |
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| 58 | """ |
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| 59 | if isinstance(name, tuple) and len(name) == 3: |
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| 60 | for n in name: |
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| 61 | if n: |
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| 62 | if not (isinstance(n, basestring) or isinstance(n, fedid)): |
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| 63 | raise authorizer_base.bad_name( |
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| 64 | "names must be either a triple or a fedid") |
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| 65 | for n in name: |
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| 66 | if n: |
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| 67 | if isinstance(n, fedid): |
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| 68 | return True |
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| 69 | else: |
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| 70 | raise authorizer_base.bad_name( |
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| 71 | "Compound names must be " + \ |
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| 72 | "rooted in fedids: %s" % str(name)) |
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| 73 | |
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| 74 | return True |
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| 75 | elif isinstance(name, fedid): |
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| 76 | return True |
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| 77 | else: |
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| 78 | raise authorizer_base.bad_name( |
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| 79 | "Names must be a triple or a fedid (%s)" % name) |
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| 80 | |
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| 81 | |
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| 82 | class authorizer(authorizer_base): |
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| 83 | """ |
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| 84 | This class keeps track of authorization attributes for the various modules |
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| 85 | running. When it gets smarter it will be the basis for a real |
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| 86 | attribute-based authentication system. |
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| 87 | """ |
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| 88 | def __init__(self, def_attr="testbed"): |
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| 89 | self.attrs = { } |
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| 90 | self.globals=set() |
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| 91 | |
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| 92 | def set_attribute(self, name, attr): |
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| 93 | """ |
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| 94 | Attach attr to name. Multiple attrs can be attached. |
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| 95 | """ |
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| 96 | self.valid_name(name) |
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| 97 | if isinstance(name, tuple): |
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| 98 | aname = tuple([ self.auth_name(n) for n in name]) |
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| 99 | else: |
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| 100 | aname = self.auth_name(name) |
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| 101 | |
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| 102 | if not self.attrs.has_key(aname): |
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| 103 | self.attrs[aname] = set() |
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| 104 | self.attrs[aname].add(attr) |
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| 105 | |
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| 106 | def unset_attribute(self, name, attr): |
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| 107 | """ |
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| 108 | Remove an attribute from name |
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| 109 | """ |
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| 110 | self.valid_name(name) |
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| 111 | if isinstance(name, tuple): |
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| 112 | aname = tuple([ self.auth_name(n) for n in name]) |
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| 113 | else: |
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| 114 | aname = self.auth_name(name) |
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| 115 | |
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| 116 | attrs = self.attrs.get(aname, None) |
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| 117 | if attrs: attrs.discard(attr) |
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| 118 | |
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| 119 | def check_attribute(self, name, attr, with_proof=False): |
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| 120 | """ |
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| 121 | Return True if name has attr (or if attr is global). Tuple names match |
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| 122 | any tuple name that matches all names present and has None entries in |
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| 123 | other fileds. For tuple names True implies that there is a matching |
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| 124 | tuple name with the attribute. |
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| 125 | """ |
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| 126 | def tup(tup, i, p): |
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| 127 | mask = 1 << i |
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| 128 | if p & mask : return authorizer.auth_name(tup[i]) |
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| 129 | else: return None |
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| 130 | |
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| 131 | self.valid_name(name) |
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| 132 | if attr in self.globals: |
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| 133 | if with_proof: return True, proof("me", name, attr) |
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| 134 | else: return True |
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| 135 | |
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| 136 | if isinstance(name, tuple): |
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| 137 | for p in range(0,8): |
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| 138 | lookup = ( tup(name, 0, p), tup(name,1, p), tup(name,2,p)) |
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| 139 | if self.attrs.has_key(lookup): |
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| 140 | if attr in self.attrs[lookup]: |
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| 141 | if with_proof: return True, proof("me", name, attr) |
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| 142 | else: return True |
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| 143 | # Drop through |
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| 144 | if with_proof: return False, proof("me", name, attr) |
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| 145 | else: return False |
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| 146 | else: |
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| 147 | if with_proof: |
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| 148 | return attr in self.attrs.get(self.auth_name(name), set()), \ |
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| 149 | proof("me", name, attr) |
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| 150 | else: |
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| 151 | return attr in self.attrs.get(self.auth_name(name), set()) |
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| 152 | |
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| 153 | def set_global_attribute(self, attr): |
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| 154 | """ |
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| 155 | Set a global attribute. All names, even those otherwise unknown to the |
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| 156 | authorizer have this attribute. |
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| 157 | """ |
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| 158 | self.globals.add(attr) |
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| 159 | |
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| 160 | def unset_global_attribute(self, attr): |
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| 161 | """ |
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| 162 | Remove a global attribute |
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| 163 | """ |
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| 164 | |
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| 165 | self.globals.discard(attr) |
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| 166 | |
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| 167 | def import_credentials(self, file_list=None, data_list=None): |
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| 168 | return False |
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| 169 | |
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| 170 | def __str__(self): |
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| 171 | rv = "" |
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| 172 | rv += "attrs %s\n" % self.attrs |
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| 173 | rv += "globals %s" % self.globals |
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| 174 | return rv |
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| 175 | |
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| 176 | def clone(self): |
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| 177 | rv = authorizer() |
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| 178 | rv.attrs = self.attrs.copy() |
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| 179 | rv.globals = self.globals.copy() |
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| 180 | return rv |
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| 181 | |
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| 182 | def save(self, fn=None): |
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| 183 | if fn: |
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| 184 | f = open(fn, "w") |
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| 185 | pickle.dump(self, f) |
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| 186 | f.close() |
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| 187 | |
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| 188 | def load(self, fn=None): |
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| 189 | if fn: |
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| 190 | f = open(fn, "r") |
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| 191 | a = pickle.load(f) |
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| 192 | f.close() |
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| 193 | self.attrs = a.attrs |
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| 194 | self.globals = a.globals |
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| 195 | |
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| 196 | |
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| 197 | class abac_authorizer(authorizer_base): |
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| 198 | """ |
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| 199 | Use the ABAC authorization system to make attribute decisions. |
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| 200 | """ |
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| 201 | |
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| 202 | clean_attr_re = re.compile('[^A-Za-z0-9_:]+') |
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| 203 | clean_prefix_attr_re = re.compile('^_+') |
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| 204 | cred_file_re = re.compile('.*\.der$') |
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| 205 | bad_name = authorizer_base.bad_name |
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| 206 | attribute_error = authorizer_base.attribute_error |
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| 207 | class no_file_error(RuntimeError): pass |
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| 208 | class bad_cert_error(RuntimeError): pass |
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| 209 | |
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| 210 | def __init__(self, certs=None, me=None, key=None, load=None, save=None, |
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| 211 | update=None): |
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| 212 | self.creddy_id = None |
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| 213 | self.globals = set() |
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| 214 | self.lock = Lock() |
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| 215 | self.me = me |
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| 216 | self.save_dir = load or save |
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| 217 | self.local_files = False |
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| 218 | if update: |
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| 219 | self.update_dir = os.path.abspath(update) |
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| 220 | else: |
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| 221 | self.update_dir = None |
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| 222 | |
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| 223 | if self.save_dir: |
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| 224 | self.save_dir = os.path.abspath(self.save_dir) |
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| 225 | # If the me parameter is a combination certificate, split it into the |
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| 226 | # abac_authorizer save directory (if any) for use with creddy. |
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| 227 | if self.me is not None and abac_pem_type(self.me) == 'both': |
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| 228 | if self.save_dir: |
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| 229 | keyfile="%s/key.pem" % self.save_dir |
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| 230 | certfile = "%s/cert.pem" % self.save_dir |
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| 231 | |
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| 232 | # Clear a spot for the new key and cert files. |
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| 233 | for fn in (keyfile, certfile): |
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| 234 | if os.access(fn, os.F_OK): |
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| 235 | os.unlink(fn) |
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| 236 | |
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| 237 | self.key, self.me = abac_split_cert(self.me, keyfile, certfile) |
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| 238 | self.local_files = True |
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| 239 | self.init_libcreddy_id() |
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| 240 | else: |
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| 241 | raise abac_authorizer.bad_cert_error("Combination " + \ |
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| 242 | "certificate and nowhere to split it"); |
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| 243 | else: |
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| 244 | self.key = key |
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| 245 | self.context = ABAC.Context() |
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| 246 | if me: |
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| 247 | self.fedid = fedid(file=self.me) |
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| 248 | rv = self.context.load_id_file(self.me) |
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| 249 | if rv != 0: |
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| 250 | raise abac_authorizer.bad_name( |
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| 251 | 'Cannot load identity from %s' % me) |
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| 252 | else: |
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| 253 | self.fedid = None |
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| 254 | |
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| 255 | if isinstance(certs, basestring): |
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| 256 | certs = [ certs ] |
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| 257 | |
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| 258 | for dir in certs or []: |
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| 259 | self.resilient_load_directory(dir) |
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| 260 | |
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| 261 | if load: |
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| 262 | self.load(load) |
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| 263 | |
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| 264 | def init_libcreddy_id(self): |
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| 265 | self.creddy_id = None |
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| 266 | try: |
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| 267 | self.creddy_id = ABAC.ID(self.me) |
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| 268 | except: |
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| 269 | raise abac_authorizer.bad_cert_error('Cannot load cert %s' \ |
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| 270 | % self.me) |
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| 271 | |
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| 272 | try: |
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| 273 | self.creddy_id.load_privkey(self.key) |
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| 274 | except: |
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| 275 | self.creddy_id = None |
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| 276 | raise abac_authorized_bad_cert_error('Cannot load key %s' \ |
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| 277 | % self.key) |
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| 278 | |
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| 279 | def resilient_load_directory(self, dirname): |
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| 280 | ''' |
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| 281 | ABAC.Context.load_directory has foolish arbitrary filename |
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| 282 | distinctions. This tries to load the contents of dirname into the |
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| 283 | authorizer's context first as IDs and then any that fail as attributes. |
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| 284 | ''' |
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| 285 | files = os.listdir(dirname) |
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| 286 | attrs = [] |
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| 287 | for f in files: |
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| 288 | p = os.path.join(dirname, f) |
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| 289 | if not os.path.isfile(p): continue |
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| 290 | if self.context.load_id_file(p) != ABAC.ABAC_CERT_SUCCESS: |
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| 291 | attrs.append(p) |
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| 292 | for p in attrs: |
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| 293 | self.context.load_attribute_file(p) |
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| 294 | |
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| 295 | |
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| 296 | |
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| 297 | # Modify the pickling operations so that the context and lock are not |
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| 298 | # pickled |
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| 299 | |
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| 300 | def __getstate__(self): |
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| 301 | d = self.__dict__.copy() |
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| 302 | del d['lock'] |
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| 303 | del d['context'] |
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| 304 | del d['creddy_id'] |
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| 305 | return d |
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| 306 | |
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| 307 | def __setstate__(self, d): |
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| 308 | # Import everything from the pickle dict (except what we excluded in |
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| 309 | # __getstate__) |
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| 310 | self.__dict__.update(d) |
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| 311 | # Initialize the unpicklables |
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| 312 | self.context = ABAC.Context() |
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| 313 | self.lock = Lock() |
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| 314 | |
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| 315 | @staticmethod |
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| 316 | def clean_attr(attr): |
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| 317 | ''' |
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| 318 | Convert anything not in A-Z_ into an _ and make sure that the string |
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| 319 | begins with a non-_. Convert to s string to keep swig happy. |
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| 320 | ''' |
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| 321 | a = abac_authorizer.clean_attr_re.sub('_', attr) |
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| 322 | return str(abac_authorizer.clean_prefix_attr_re.sub('', a)) |
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| 323 | |
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| 324 | |
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| 325 | def import_credentials(self, file_list=None, data_list=None): |
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| 326 | ''' |
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| 327 | Import a list of credentials. Be careful about dependencies and only |
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| 328 | use one logic loop. if files are given, append them to the list of |
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| 329 | chunks and then try to read each chunk as an ID and then the failed |
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| 330 | ones as attributes. |
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| 331 | ''' |
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| 332 | if file_list: |
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| 333 | if data_list is None: data_list = [] |
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| 334 | for fn in file_list: |
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| 335 | # Try to parse file as a ABAC ID, so we can import PEM files |
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| 336 | try: |
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| 337 | cid = ABAC.ID(fn) |
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| 338 | data_list.append(cid.cert_chunk()) |
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| 339 | continue |
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| 340 | except: |
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| 341 | # Not an ID |
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| 342 | pass |
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| 343 | try: |
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| 344 | f = open(fn, 'r') |
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| 345 | data_list.append(f.read()) |
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| 346 | f.close() |
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| 347 | except EnvironmentError, e: |
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| 348 | # Ignore unreadable files |
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| 349 | pass |
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| 350 | # Now one way or another data_list is ready |
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| 351 | if data_list: |
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| 352 | rv = [] |
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| 353 | attr_list = [ ] |
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| 354 | for d in data_list: |
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| 355 | if self.context.load_id_chunk(d) != ABAC.ABAC_CERT_SUCCESS: |
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| 356 | attr_list.append(d) |
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| 357 | else: |
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| 358 | rv.append(True) |
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| 359 | |
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| 360 | for d in attr_list: |
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| 361 | v = self.context.load_attribute_chunk(d) |
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| 362 | rv.append(v == ABAC.ABAC_CERT_SUCCESS) |
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| 363 | return all(rv) |
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| 364 | else: |
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| 365 | return False |
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| 366 | |
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| 367 | def import_credential(self, file=None, data=None): |
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| 368 | if data: |
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| 369 | if self.context.load_id_chunk(data) != ABAC.ABAC_CERT_SUCCESS: |
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| 370 | return self.context.load_attribute_chunk(data) == \ |
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| 371 | ABAC.ABAC_CERT_SUCCESS |
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| 372 | else: |
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| 373 | return True |
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| 374 | elif file: |
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| 375 | if self.context.load_id_file(file) != ABAC.ABAC_CERT_SUCCESS: |
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| 376 | return self.context.load_attribute_file(file) == \ |
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| 377 | ABAC.ABAC_CERT_SUCCESS |
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| 378 | else: |
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| 379 | return True |
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| 380 | else: |
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| 381 | return False |
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| 382 | |
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| 383 | def set_attribute(self, name=None, attr=None, cert=None): |
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| 384 | if name and attr: |
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| 385 | if isinstance(name, tuple): |
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| 386 | raise abac_authorizer.bad_name( |
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| 387 | "ABAC doesn't understand three-names") |
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| 388 | # Convert non-string attributes to strings |
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| 389 | if not isinstance(attr, basestring): |
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| 390 | attr = "%s" % attr |
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| 391 | |
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| 392 | if self.creddy_id: |
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| 393 | # Create a credential and insert it into context |
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| 394 | # This will simplify when we have libcreddy |
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| 395 | try: |
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| 396 | attrcert = ABAC.Attribute(self.creddy_id, |
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| 397 | self.clean_attr(attr), 3600 * 24 * 365 * 10) |
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| 398 | attrcert.principal("%s" % name) |
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| 399 | attrcert.bake() |
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| 400 | except: |
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| 401 | raise abac_authorizer.bad_cert_error( |
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| 402 | "Cannot create attribute cert") |
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| 403 | self.lock.acquire() |
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| 404 | # load it to context and remove the file |
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| 405 | rv = self.context.load_attribute_chunk(attrcert.cert_chunk()) |
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| 406 | self.lock.release() |
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| 407 | return rv |
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| 408 | else: |
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| 409 | raise abac_authorizer.attribute_error( |
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| 410 | "Identity and key not specified on creation") |
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| 411 | elif cert: |
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| 412 | # Insert this credential into the context |
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| 413 | self.lock.acquire() |
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| 414 | rv = self.context.load_attribute_chunk(cert) |
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| 415 | self.lock.release() |
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| 416 | return rv |
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| 417 | else: |
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| 418 | raise abac_authorizer.attribute_error( |
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| 419 | "Neither name/attr nor cert is set") |
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| 420 | |
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| 421 | def unset_attribute(self, name, attr): |
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| 422 | if isinstance(name, tuple): |
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| 423 | raise abac_authorizer.bad_name( |
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| 424 | "ABAC doesn't understand three-names") |
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| 425 | # Convert non-string attributes to strings |
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| 426 | if not isinstance(attr, basestring): |
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| 427 | attr = "%s" % attr |
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| 428 | cattr = self.clean_attr(attr) |
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| 429 | self.lock.acquire() |
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| 430 | ctxt = ABAC.Context() |
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| 431 | ids = set() |
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| 432 | for c in self.context.credentials(): |
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| 433 | h = c.head() |
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| 434 | t = c.tail() |
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| 435 | if h.is_role() and t.is_principal(): |
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| 436 | if t.principal() == '%s' % name and \ |
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| 437 | h.principal() == '%s' % self.fedid and \ |
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| 438 | h.role_name() == cattr: |
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| 439 | continue |
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| 440 | |
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| 441 | id = c.issuer_cert() |
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| 442 | if id not in ids: |
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| 443 | ctxt.load_id_chunk(id) |
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| 444 | ids.add(id) |
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| 445 | ctxt.load_attribute_chunk(c.attribute_cert()) |
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| 446 | self.context = ctxt |
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| 447 | self.lock.release() |
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| 448 | |
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| 449 | @staticmethod |
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| 450 | def starts_with_fedid(attr): |
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| 451 | """ |
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| 452 | Return true if the first 40 characters of the string are hex digits |
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| 453 | followed by a dot. False otherwise. Used in check_attribute. |
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| 454 | """ |
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| 455 | if attr.find('.') == 40: |
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| 456 | return all([ x in hexdigits for x in attr[0:40]]) |
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| 457 | else: |
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| 458 | return False |
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| 459 | |
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| 460 | |
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| 461 | def check_attribute(self, name, attr, with_proof=False): |
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| 462 | if isinstance(name, tuple): |
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| 463 | raise abac_authorizer.bad_name( |
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| 464 | "ABAC doesn't understand three-names") |
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| 465 | else: |
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| 466 | # Convert non-string attributes to strings |
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| 467 | if not isinstance(attr, basestring): |
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| 468 | attr = "%s" % attr |
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| 469 | # Attributes that start with a fedid only have the part of the |
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| 470 | # attribute after the dot cleaned. Others are completely cleaned |
|---|
| 471 | # and have the owner fedid attached. |
|---|
| 472 | if self.starts_with_fedid(attr): |
|---|
| 473 | r, a = attr.split('.',1) |
|---|
| 474 | a = "%s.%s" % ( r, self.clean_attr(a)) |
|---|
| 475 | else: |
|---|
| 476 | a = "%s.%s" % (self.fedid, self.clean_attr(attr)) |
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| 477 | |
|---|
| 478 | a = str(a) |
|---|
| 479 | n = str("%s" % name) |
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| 480 | |
|---|
| 481 | self.lock.acquire() |
|---|
| 482 | # Sigh. Unicode vs swig and swig seems to lose. Make sure |
|---|
| 483 | # everything we pass into ABAC is a str not a unicode. |
|---|
| 484 | rv, p = self.context.query(a, n) |
|---|
| 485 | # XXX delete soon |
|---|
| 486 | if not rv and attr in self.globals: |
|---|
| 487 | rv = True |
|---|
| 488 | p = None |
|---|
| 489 | self.lock.release() |
|---|
| 490 | if with_proof: return rv, proof(self.fedid, name, a, p) |
|---|
| 491 | else: return rv |
|---|
| 492 | |
|---|
| 493 | def set_global_attribute(self, attr): |
|---|
| 494 | """ |
|---|
| 495 | Set a global attribute. All names, even those otherwise unknown to the |
|---|
| 496 | authorizer have this attribute. |
|---|
| 497 | """ |
|---|
| 498 | self.lock.acquire() |
|---|
| 499 | self.globals.add(self.clean_attr(attr)) |
|---|
| 500 | self.lock.release() |
|---|
| 501 | |
|---|
| 502 | def unset_global_attribute(self, attr): |
|---|
| 503 | """ |
|---|
| 504 | Remove a global attribute |
|---|
| 505 | """ |
|---|
| 506 | |
|---|
| 507 | self.lock.acquire() |
|---|
| 508 | self.globals.discard(self.clean_attr(attr)) |
|---|
| 509 | self.lock.release() |
|---|
| 510 | |
|---|
| 511 | def clone(self): |
|---|
| 512 | self.lock.acquire() |
|---|
| 513 | rv = abac_authorizer(me=self.me, key=self.key) |
|---|
| 514 | rv.globals = self.globals.copy() |
|---|
| 515 | rv.context = ABAC.Context(self.context) |
|---|
| 516 | self.lock.release() |
|---|
| 517 | return rv |
|---|
| 518 | |
|---|
| 519 | def copy_file(self, src, dest, mode=0600): |
|---|
| 520 | ''' |
|---|
| 521 | Copy src to dest with file mode mode. May raise exceptions on file ops |
|---|
| 522 | ''' |
|---|
| 523 | same_file = False |
|---|
| 524 | try: |
|---|
| 525 | ss = os.stat(src) |
|---|
| 526 | ds = os.stat(dest) |
|---|
| 527 | |
|---|
| 528 | if ds.st_ino == ss.st_ino: same_file = True |
|---|
| 529 | except EnvironmentError: |
|---|
| 530 | pass |
|---|
| 531 | |
|---|
| 532 | if not same_file: |
|---|
| 533 | d = open(dest, 'w') |
|---|
| 534 | s = open(src, 'r') |
|---|
| 535 | d.write(s.read()) |
|---|
| 536 | s.close() |
|---|
| 537 | d.close() |
|---|
| 538 | os.chmod(dest, mode) |
|---|
| 539 | |
|---|
| 540 | |
|---|
| 541 | |
|---|
| 542 | def save(self, dir=None): |
|---|
| 543 | self.lock.acquire() |
|---|
| 544 | if dir: |
|---|
| 545 | self.save_dir = os.path.abspath(dir) |
|---|
| 546 | else: |
|---|
| 547 | dir = self.save_dir |
|---|
| 548 | if dir is None: |
|---|
| 549 | self.lock.release() |
|---|
| 550 | raise abac_authorizer.no_file_error("No load directory specified") |
|---|
| 551 | try: |
|---|
| 552 | if not os.access(dir, os.F_OK): |
|---|
| 553 | os.mkdir(dir) |
|---|
| 554 | |
|---|
| 555 | # if self.key and self.me were split, copy the split files into the |
|---|
| 556 | # new directory. |
|---|
| 557 | if self.local_files: |
|---|
| 558 | self.copy_file(self.key, '%s/key.pem' % dir) |
|---|
| 559 | self.copy_file(self.me, '%s/cert.pem' % dir) |
|---|
| 560 | # Point the key and me members to the new locations for |
|---|
| 561 | # pickling |
|---|
| 562 | hold_key = self.key |
|---|
| 563 | hold_me = self.me |
|---|
| 564 | self.key = '%s/key.pem' % dir |
|---|
| 565 | self.me = '%s/cert.pem' % dir |
|---|
| 566 | |
|---|
| 567 | f = open("%s/state" % dir, "w") |
|---|
| 568 | pickle.dump(self, f) |
|---|
| 569 | f.close() |
|---|
| 570 | |
|---|
| 571 | if self.local_files: |
|---|
| 572 | self.key = hold_key |
|---|
| 573 | self.me = hold_me |
|---|
| 574 | |
|---|
| 575 | if not os.access("%s/certs" %dir, os.F_OK): |
|---|
| 576 | os.mkdir("%s/certs" % dir) |
|---|
| 577 | |
|---|
| 578 | # Clear the certs subdir |
|---|
| 579 | for fn in [ f for f in os.listdir("%s/certs" % dir) \ |
|---|
| 580 | if abac_authorizer.cred_file_re.match(f)]: |
|---|
| 581 | os.unlink('%s/certs/%s' % (dir, fn)) |
|---|
| 582 | |
|---|
| 583 | # Save the context |
|---|
| 584 | ii = 0 |
|---|
| 585 | ai = 0 |
|---|
| 586 | seenid = set() |
|---|
| 587 | seenattr = set() |
|---|
| 588 | for c in self.context.credentials(): |
|---|
| 589 | id = c.issuer_cert() |
|---|
| 590 | attr = c.attribute_cert() |
|---|
| 591 | # NB: file naming conventions matter here. The trailing_ID and |
|---|
| 592 | # _attr are required by ABAC.Context.load_directory(). We use |
|---|
| 593 | # resilient_load_directory now, but no sense pulling these out |
|---|
| 594 | # now. |
|---|
| 595 | if id and id not in seenid: |
|---|
| 596 | f = open("%s/certs/ID_%05d_ID.xml" % (dir, ii), "w") |
|---|
| 597 | f.write(id) |
|---|
| 598 | f.close() |
|---|
| 599 | ii += 1 |
|---|
| 600 | seenid.add(id) |
|---|
| 601 | if attr and attr not in seenattr: |
|---|
| 602 | f = open("%s/certs/attr_%05d_attr.xml" % (dir, ai), "w") |
|---|
| 603 | f.write(attr) |
|---|
| 604 | f.close() |
|---|
| 605 | ai += 1 |
|---|
| 606 | seenattr.add(attr) |
|---|
| 607 | except EnvironmentError, e: |
|---|
| 608 | self.lock.release() |
|---|
| 609 | raise e |
|---|
| 610 | except pickle.PickleError, e: |
|---|
| 611 | self.lock.release() |
|---|
| 612 | raise e |
|---|
| 613 | self.lock.release() |
|---|
| 614 | |
|---|
| 615 | def load(self, dir=None): |
|---|
| 616 | self.lock.acquire() |
|---|
| 617 | if dir: |
|---|
| 618 | self.save_dir = dir |
|---|
| 619 | else: |
|---|
| 620 | dir = self.save_dir |
|---|
| 621 | if dir is None: |
|---|
| 622 | self.lock.release() |
|---|
| 623 | raise abac_authorizer.no_file_error("No load directory specified") |
|---|
| 624 | try: |
|---|
| 625 | if os.access("%s/state" % dir, os.R_OK): |
|---|
| 626 | f = open("%s/state" % dir, "r") |
|---|
| 627 | st = pickle.load(f) |
|---|
| 628 | f.close() |
|---|
| 629 | # Copy the useful attributes from the pickled state |
|---|
| 630 | for a in ('globals', 'key', 'me', 'cert', 'fedid'): |
|---|
| 631 | setattr(self, a, getattr(st, a, None)) |
|---|
| 632 | |
|---|
| 633 | # Initialize the new context with the new identity |
|---|
| 634 | self.context = ABAC.Context() |
|---|
| 635 | if self.me: |
|---|
| 636 | self.context.load_id_file(self.me) |
|---|
| 637 | if self.key: |
|---|
| 638 | self.init_libcreddy_id() |
|---|
| 639 | self.resilient_load_directory("%s/certs" % dir) |
|---|
| 640 | self.save_dir = dir |
|---|
| 641 | except EnvironmentError, e: |
|---|
| 642 | self.lock.release() |
|---|
| 643 | raise e |
|---|
| 644 | except pickle.PickleError, e: |
|---|
| 645 | self.lock.release() |
|---|
| 646 | raise e |
|---|
| 647 | self.lock.release() |
|---|
| 648 | |
|---|
| 649 | @staticmethod |
|---|
| 650 | def encode_credential(c): |
|---|
| 651 | return '%s <- %s' % (c.head().string(), c.tail().string()) |
|---|
| 652 | |
|---|
| 653 | def get_creds_for_principal(self, fid): |
|---|
| 654 | look_for = set(["%s" % fid]) |
|---|
| 655 | found_attrs = set() |
|---|
| 656 | next_look = set() |
|---|
| 657 | found = set([]) |
|---|
| 658 | |
|---|
| 659 | self.lock.acquire() |
|---|
| 660 | while look_for: |
|---|
| 661 | for c in self.context.credentials(): |
|---|
| 662 | tail = c.tail() |
|---|
| 663 | # XXX: This needs to be more aggressive for linked stuff |
|---|
| 664 | if tail.string() in look_for and c not in found: |
|---|
| 665 | found.add(c) |
|---|
| 666 | next_look.add(c.head().string()) |
|---|
| 667 | |
|---|
| 668 | look_for = next_look |
|---|
| 669 | next_look = set() |
|---|
| 670 | self.lock.release() |
|---|
| 671 | |
|---|
| 672 | return found |
|---|
| 673 | |
|---|
| 674 | def update(self): |
|---|
| 675 | rv = False |
|---|
| 676 | if self.update_dir is None or not os.path.isdir(self.update_dir): |
|---|
| 677 | return True |
|---|
| 678 | lf = None |
|---|
| 679 | files = [] |
|---|
| 680 | try: |
|---|
| 681 | lf = open('%s/lock' % self.update_dir, 'w') |
|---|
| 682 | except EnvironmentError, e: |
|---|
| 683 | return rv |
|---|
| 684 | try: |
|---|
| 685 | fcntl.flock(lf, fcntl.LOCK_EX) |
|---|
| 686 | files = [os.path.join(self.update_dir, fn) \ |
|---|
| 687 | for fn in os.listdir(self.update_dir) \ |
|---|
| 688 | if fn != 'lock'] |
|---|
| 689 | rv = self.import_credentials(file_list=files) |
|---|
| 690 | try: |
|---|
| 691 | for fn in files: |
|---|
| 692 | os.remove(fn) |
|---|
| 693 | except EnvironmentError, e: |
|---|
| 694 | # failure to clear the update directory is no biggie |
|---|
| 695 | pass |
|---|
| 696 | rv = True |
|---|
| 697 | finally: |
|---|
| 698 | fcntl.flock(lf, fcntl.LOCK_UN) |
|---|
| 699 | return rv |
|---|
| 700 | |
|---|
| 701 | |
|---|
| 702 | |
|---|
| 703 | |
|---|
| 704 | def __str__(self): |
|---|
| 705 | |
|---|
| 706 | self.lock.acquire() |
|---|
| 707 | rv = "%s" % self.fedid |
|---|
| 708 | add = join([abac_authorizer.encode_credential(c) |
|---|
| 709 | for c in self.context.credentials()], '\n'); |
|---|
| 710 | if add: rv += "\n%s" % add |
|---|
| 711 | self.lock.release() |
|---|
| 712 | return rv |
|---|
| 713 | |
|---|
