| 1 | #/usr/local/bin/python |
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| 2 | |
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| 3 | from string import join |
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| 4 | from tempfile import mkstemp |
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| 5 | from subprocess import call |
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| 6 | from threading import Lock |
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| 7 | |
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| 8 | from string import join |
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| 9 | |
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| 10 | from fedid import fedid |
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| 11 | from remote_service import service_caller |
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| 12 | from service_error import service_error |
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| 13 | |
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| 14 | |
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| 15 | import ABAC |
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| 16 | import pickle |
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| 17 | |
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| 18 | import sys |
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| 19 | import os |
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| 20 | import re |
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| 21 | |
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| 22 | class authorizer_base: |
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| 23 | """ |
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| 24 | Classes based on this one keep track of authorization attributes for the |
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| 25 | various modules running. This base class holds some utility functions that |
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| 26 | they all potentially use. |
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| 27 | """ |
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| 28 | |
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| 29 | # general error exception for badly formed names. |
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| 30 | class bad_name(RuntimeError): pass |
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| 31 | # difficulty creating an attribute |
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| 32 | class attribute_error(RuntimeError): pass |
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| 33 | |
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| 34 | @staticmethod |
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| 35 | def auth_name(name): |
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| 36 | """ |
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| 37 | Helper to convert a non-unicode local name to a unicode string. Mixed |
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| 38 | representations can needlessly confuse the authorizer. |
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| 39 | """ |
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| 40 | if isinstance(name, basestring): |
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| 41 | if not isinstance(name, unicode): return unicode(name) |
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| 42 | else: return name |
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| 43 | else: return name |
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| 44 | |
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| 45 | @staticmethod |
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| 46 | def valid_name(name): |
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| 47 | """ |
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| 48 | Ensure that the given name is valid. A valid name can either be a |
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| 49 | triple of strings and fedids representing one of our generalized Emulab |
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| 50 | names or a single fedid. Compound names can include wildcards (None) |
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| 51 | and must anchor to a fedid at their highest level (unless they're all |
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| 52 | None) |
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| 53 | |
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| 54 | This either returns True or throws an exception. More an assertion |
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| 55 | than a function. |
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| 56 | """ |
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| 57 | if isinstance(name, tuple) and len(name) == 3: |
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| 58 | for n in name: |
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| 59 | if n: |
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| 60 | if not (isinstance(n, basestring) or isinstance(n, fedid)): |
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| 61 | raise authorizer_base.bad_name( |
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| 62 | "names must be either a triple or a fedid") |
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| 63 | for n in name: |
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| 64 | if n: |
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| 65 | if isinstance(n, fedid): |
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| 66 | return True |
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| 67 | else: |
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| 68 | raise authorizer_base.bad_name( |
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| 69 | "Compound names must be " + \ |
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| 70 | "rooted in fedids: %s" % str(name)) |
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| 71 | |
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| 72 | return True |
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| 73 | elif isinstance(name, fedid): |
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| 74 | return True |
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| 75 | else: |
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| 76 | raise authorizer_base.bad_name( |
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| 77 | "Names must be a triple or a fedid (%s)" % name) |
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| 78 | |
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| 79 | |
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| 80 | class authorizer(authorizer_base): |
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| 81 | """ |
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| 82 | This class keeps track of authorization attributes for the various modules |
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| 83 | running. When it gets smarter it will be the basis for a real |
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| 84 | attribute-based authentication system. |
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| 85 | """ |
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| 86 | def __init__(self, def_attr="testbed"): |
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| 87 | self.attrs = { } |
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| 88 | self.globals=set() |
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| 89 | |
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| 90 | def set_attribute(self, name, attr): |
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| 91 | """ |
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| 92 | Attach attr to name. Multiple attrs can be attached. |
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| 93 | """ |
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| 94 | self.valid_name(name) |
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| 95 | if isinstance(name, tuple): |
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| 96 | aname = tuple([ self.auth_name(n) for n in name]) |
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| 97 | else: |
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| 98 | aname = self.auth_name(name) |
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| 99 | |
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| 100 | if not self.attrs.has_key(aname): |
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| 101 | self.attrs[aname] = set() |
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| 102 | self.attrs[aname].add(attr) |
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| 103 | |
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| 104 | def unset_attribute(self, name, attr): |
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| 105 | """ |
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| 106 | Remove an attribute from name |
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| 107 | """ |
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| 108 | self.valid_name(name) |
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| 109 | if isinstance(name, tuple): |
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| 110 | aname = tuple([ self.auth_name(n) for n in name]) |
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| 111 | else: |
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| 112 | aname = self.auth_name(name) |
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| 113 | |
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| 114 | attrs = self.attrs.get(aname, None) |
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| 115 | if attrs: attrs.discard(attr) |
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| 116 | |
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| 117 | def check_attribute(self, name, attr): |
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| 118 | """ |
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| 119 | Return True if name has attr (or if attr is global). Tuple names match |
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| 120 | any tuple name that matches all names present and has None entries in |
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| 121 | other fileds. For tuple names True implies that there is a matching |
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| 122 | tuple name with the attribute. |
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| 123 | """ |
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| 124 | def tup(tup, i, p): |
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| 125 | mask = 1 << i |
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| 126 | if p & mask : return authorizer.auth_name(tup[i]) |
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| 127 | else: return None |
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| 128 | |
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| 129 | self.valid_name(name) |
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| 130 | if attr in self.globals: |
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| 131 | return True |
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| 132 | |
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| 133 | if isinstance(name, tuple): |
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| 134 | for p in range(0,8): |
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| 135 | lookup = ( tup(name, 0, p), tup(name,1, p), tup(name,2,p)) |
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| 136 | if self.attrs.has_key(lookup): |
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| 137 | if attr in self.attrs[lookup]: |
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| 138 | return True |
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| 139 | else: |
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| 140 | return attr in self.attrs.get(self.auth_name(name), set()) |
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| 141 | |
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| 142 | def set_global_attribute(self, attr): |
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| 143 | """ |
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| 144 | Set a global attribute. All names, even those otherwise unknown to the |
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| 145 | authorizer have this attribute. |
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| 146 | """ |
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| 147 | self.globals.add(attr) |
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| 148 | |
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| 149 | def unset_global_attribute(self, attr): |
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| 150 | """ |
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| 151 | Remove a global attribute |
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| 152 | """ |
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| 153 | |
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| 154 | self.globals.discard(attr) |
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| 155 | |
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| 156 | def import_credentials(self, file_list=None, data_list=None): |
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| 157 | return False |
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| 158 | |
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| 159 | def __str__(self): |
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| 160 | rv = "" |
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| 161 | rv += "attrs %s\n" % self.attrs |
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| 162 | rv += "globals %s" % self.globals |
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| 163 | return rv |
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| 164 | |
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| 165 | def clone(self): |
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| 166 | rv = authorizer() |
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| 167 | rv.attrs = self.attrs.copy() |
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| 168 | rv.globals = self.globals.copy() |
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| 169 | return rv |
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| 170 | |
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| 171 | def save(self, fn): |
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| 172 | f = open(fn, "w") |
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| 173 | pickle.dump(self, f) |
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| 174 | f.close() |
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| 175 | |
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| 176 | def load(self, fn): |
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| 177 | f = open(fn, "r") |
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| 178 | a = pickle.load(f) |
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| 179 | f.close() |
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| 180 | self.attrs = a.attrs |
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| 181 | self.globals = a.globals |
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| 182 | |
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| 183 | |
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| 184 | class abac_authorizer(authorizer_base): |
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| 185 | """ |
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| 186 | Use the ABAC authorization system to make attribute decisions. |
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| 187 | """ |
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| 188 | |
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| 189 | clean_attr_re = re.compile('[^A-Za-z0-9_]+') |
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| 190 | cred_file_re = re.compile('.*\.der$') |
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| 191 | bad_name = authorizer_base.bad_name |
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| 192 | attribute_error = authorizer_base.attribute_error |
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| 193 | class no_file(RuntimeError): pass |
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| 194 | |
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| 195 | def __init__(self, certs=None, me=None, key=None, load=None): |
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| 196 | self.creddy = '/usr/local/bin/creddy' |
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| 197 | self.globals = set() |
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| 198 | self.lock = Lock() |
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| 199 | self.me = me |
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| 200 | self.key = key |
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| 201 | self.context = ABAC.Context() |
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| 202 | if me: |
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| 203 | self.fedid = fedid(file=self.me) |
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| 204 | rv = self.context.load_id_file(self.me) |
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| 205 | if rv != 0: |
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| 206 | raise abac_authorizer.bad_name( |
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| 207 | 'Cannot load identity from %s' % me.cert) |
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| 208 | else: |
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| 209 | self.fedid = None |
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| 210 | |
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| 211 | if isinstance(certs, basestring): |
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| 212 | certs = [ certs ] |
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| 213 | |
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| 214 | for dir in certs or []: |
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| 215 | self.context.load_directory(dir) |
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| 216 | |
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| 217 | if load: |
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| 218 | self.save_dir = load |
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| 219 | self.load(load) |
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| 220 | else: |
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| 221 | self.save_dir = None |
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| 222 | |
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| 223 | @staticmethod |
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| 224 | def clean_attr(attr): |
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| 225 | return abac_authorizer.clean_attr_re.sub('_', attr) |
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| 226 | |
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| 227 | def import_credentials(self, file_list=None, data_list=None): |
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| 228 | if data_list: |
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| 229 | return any([self.import_credential(data=d) for d in data_list]) |
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| 230 | elif file_list: |
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| 231 | return any([self.import_credential(file=f) for f in file_list]) |
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| 232 | else: |
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| 233 | return False |
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| 234 | |
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| 235 | def import_credential(self, file=None, data=None): |
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| 236 | if data: |
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| 237 | if self.context.load_id_chunk(data) != ABAC.ABAC_CERT_SUCCESS: |
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| 238 | return self.context.load_attribute_chunk(data) == \ |
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| 239 | ABAC.ABAC_CERT_SUCCESS |
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| 240 | else: |
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| 241 | return True |
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| 242 | elif file: |
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| 243 | if self.context.load_id_file(file) != ABAC.ABAC_CERT_SUCCESS: |
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| 244 | return self.context.load_attribute_file(file) == \ |
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| 245 | ABAC.ABAC_CERT_SUCCESS |
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| 246 | else: |
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| 247 | return True |
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| 248 | else: |
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| 249 | return False |
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| 250 | |
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| 251 | def set_attribute(self, name=None, attr=None, cert=None): |
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| 252 | if name and attr: |
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| 253 | if isinstance(name, tuple): |
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| 254 | raise abac_authorizer.bad_name( |
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| 255 | "ABAC doesn't understand three-names") |
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| 256 | # Convert non-string attributes to strings |
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| 257 | if not isinstance(attr, basestring): |
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| 258 | attr = "%s" % attr |
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| 259 | if self.me and self.key: |
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| 260 | # Create a credential and insert it into context |
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| 261 | # This will simplify when we have libcreddy |
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| 262 | try: |
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| 263 | # create temp file |
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| 264 | f, fn = mkstemp() |
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| 265 | os.close(f) |
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| 266 | except EnvironmentError, e: |
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| 267 | raise abac_authorizer.attribute_error( |
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| 268 | "Cannot create temp file: %s" %e) |
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| 269 | |
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| 270 | # Create the attribute certificate with creddy |
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| 271 | cmd = [self.creddy, '--attribute', '--issuer=%s' % self.me, |
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| 272 | '--key=%s' % self.key, '--role=%s' % self.clean_attr(attr), |
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| 273 | '--subject-id=%s' % name, '--out=%s' % fn] |
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| 274 | rv = call(cmd) |
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| 275 | if rv == 0: |
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| 276 | self.lock.acquire() |
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| 277 | # load it to context and remove the file |
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| 278 | rv = self.context.load_attribute_file(fn) |
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| 279 | self.lock.release() |
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| 280 | os.unlink(fn) |
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| 281 | else: |
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| 282 | os.unlink(fn) |
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| 283 | raise abac_authorizer.attribute_error( |
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| 284 | "creddy returned %s" % rv) |
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| 285 | else: |
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| 286 | raise abac_authorizer.attribute_error( |
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| 287 | "Identity and key not specified on creation") |
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| 288 | elif cert: |
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| 289 | # Insert this credential into the context |
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| 290 | self.lock.acquire() |
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| 291 | self.context.load_attribute_chunk(cert) |
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| 292 | self.lock.release() |
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| 293 | else: |
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| 294 | raise abac_authorizer.attribute_error( |
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| 295 | "Neither name/attr nor cert is set") |
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| 296 | |
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| 297 | def unset_attribute(self, name, attr): |
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| 298 | if isinstance(name, tuple): |
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| 299 | raise abac_authorizer.bad_name( |
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| 300 | "ABAC doesn't understand three-names") |
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| 301 | # Convert non-string attributes to strings |
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| 302 | if not isinstance(attr, basestring): |
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| 303 | attr = "%s" % attr |
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| 304 | cattr = self.clean_attr(attr) |
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| 305 | self.lock.acquire() |
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| 306 | ctxt = ABAC.Context() |
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| 307 | ids = set() |
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| 308 | for c in self.context.credentials(): |
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| 309 | h = c.head() |
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| 310 | t = c.tail() |
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| 311 | if h.is_role() and t.is_principal(): |
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| 312 | if t.principal() == '%s' % name and \ |
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| 313 | h.principal() == '%s' % self.fedid and \ |
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| 314 | h.role_name() == cattr: |
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| 315 | continue |
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| 316 | |
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| 317 | id = c.issuer_cert() |
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| 318 | if id not in ids: |
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| 319 | ctxt.load_id_chunk(id) |
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| 320 | ids.add(id) |
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| 321 | ctxt.load_attribute_chunk(c.attribute_cert()) |
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| 322 | self.context = ctxt |
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| 323 | self.lock.release() |
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| 324 | |
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| 325 | |
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| 326 | def check_attribute(self, name, attr): |
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| 327 | # XXX proof soon |
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| 328 | if isinstance(name, tuple): |
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| 329 | raise abac_authorizer.bad_name( |
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| 330 | "ABAC doesn't understand three-names") |
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| 331 | else: |
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| 332 | # Convert non-string attributes to strings |
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| 333 | if not isinstance(attr, basestring): |
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| 334 | attr = "%s" % attr |
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| 335 | # Naked attributes are attested by this principal |
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| 336 | if attr.find('.') == -1: |
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| 337 | a = "%s.%s" % (self.fedid, self.clean_attr(attr)) |
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| 338 | else: |
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| 339 | r, a = attr.split('.',1) |
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| 340 | a = "%s.%s" ( r, self.clean_attr(a)) |
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| 341 | |
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| 342 | self.lock.acquire() |
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| 343 | rv, proof = self.context.query(a, "%s" % name) |
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| 344 | # XXX delete soon |
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| 345 | if not rv and attr in self.globals: rv = True |
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| 346 | self.lock.release() |
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| 347 | |
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| 348 | return rv |
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| 349 | |
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| 350 | def set_global_attribute(self, attr): |
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| 351 | """ |
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| 352 | Set a global attribute. All names, even those otherwise unknown to the |
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| 353 | authorizer have this attribute. |
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| 354 | """ |
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| 355 | self.lock.acquire() |
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| 356 | self.globals.add(self.clean_attr(attr)) |
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| 357 | self.lock.release() |
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| 358 | |
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| 359 | def unset_global_attribute(self, attr): |
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| 360 | """ |
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| 361 | Remove a global attribute |
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| 362 | """ |
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| 363 | |
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| 364 | self.lock.acquire() |
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| 365 | self.globals.discard(self.clean_attr(attr)) |
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| 366 | self.lock.release() |
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| 367 | |
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| 368 | def clone(self): |
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| 369 | self.lock.acquire() |
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| 370 | rv = abac_authorizer(me=self.me, key=self.key) |
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| 371 | rv.globals = self.globals.copy() |
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| 372 | rv.context = ABAC.Context(self.context) |
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| 373 | self.lock.release() |
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| 374 | return rv |
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| 375 | |
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| 376 | def save(self, dir=None): |
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| 377 | self.lock.acquire() |
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| 378 | if dir: |
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| 379 | self.save_dir = dir |
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| 380 | else: |
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| 381 | dir = self.save_dir |
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| 382 | if dir is None: |
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| 383 | self.lock.release() |
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| 384 | raise abac_authorizer.no_file_error("No load directory specified") |
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| 385 | try: |
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| 386 | if not os.access(dir, os.F_OK): |
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| 387 | os.mkdir(dir) |
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| 388 | # These are unpicklable, so set them aside |
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| 389 | context = self.context |
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| 390 | lock = self.lock |
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| 391 | self.context = None |
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| 392 | self.lock = None |
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| 393 | |
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| 394 | f = open("%s/state" % dir, "w") |
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| 395 | pickle.dump(self, f) |
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| 396 | f.close() |
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| 397 | |
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| 398 | if not os.access("%s/certs" %dir, os.F_OK): |
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| 399 | os.mkdir("%s/certs" % dir) |
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| 400 | seenid = set() |
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| 401 | seenattr = set() |
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| 402 | |
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| 403 | #restore unpicklable state |
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| 404 | self.context = context |
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| 405 | self.lock = lock |
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| 406 | #remove old certs |
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| 407 | for fn in [ f for f in os.listdir("%s/certs" % dir) \ |
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| 408 | if abac_authorizer.cred_file_re.match(f)]: |
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| 409 | os.unlink('%s/certs/%s' % (dir, fn)) |
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| 410 | ii = 0 |
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| 411 | ai = 0 |
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| 412 | for c in self.context.credentials(): |
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| 413 | id = c.issuer_cert() |
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| 414 | attr = c.attribute_cert() |
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| 415 | # NB: file naming conventions matter here. The trailing_ID and |
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| 416 | # _attr are required by ABAC.COntext.load_directory() |
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| 417 | if id and id not in seenid: |
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| 418 | f = open("%s/certs/ID_%03d_ID.der" % (dir, ii), "w") |
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| 419 | f.write(id) |
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| 420 | f.close() |
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| 421 | ii += 1 |
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| 422 | seenid.add(id) |
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| 423 | if attr and attr not in seenattr: |
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| 424 | f = open("%s/certs/attr_%03d_attr.der" % (dir, ai), "w") |
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| 425 | f.write(attr) |
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| 426 | f.close() |
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| 427 | ai += 1 |
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| 428 | seenattr.add(attr) |
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| 429 | except EnvironmentError, e: |
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| 430 | # If we've mislaid self.lock, release lock (they're the same object) |
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| 431 | if self.lock: self.lock.release() |
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| 432 | elif lock: lock.release() |
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| 433 | raise e |
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| 434 | except pickle.PickleError, e: |
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| 435 | # If we've mislaid self.lock, release lock (they're the same object) |
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| 436 | if self.lock: self.lock.release() |
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| 437 | elif lock: lock.release() |
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| 438 | raise e |
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| 439 | self.lock.release() |
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| 440 | |
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| 441 | def load(self, dir=None): |
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| 442 | self.lock.acquire() |
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| 443 | if dir: |
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| 444 | self.save_dir = dir |
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| 445 | else: |
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| 446 | dir = self.save_dir |
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| 447 | if dir is None: |
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| 448 | self.lock.release() |
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| 449 | raise abac_authorizer.no_file_error("No load directory specified") |
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| 450 | try: |
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| 451 | if os.access("%s/state" % dir, os.R_OK): |
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| 452 | f = open("%s/state" % dir, "r") |
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| 453 | st = pickle.load(f) |
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| 454 | f.close() |
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| 455 | # Cpoy the useful attributes from the pickled state |
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| 456 | for a in ('globals', 'key', 'me', 'cert', 'fedid'): |
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| 457 | setattr(self, a, getattr(st, a, None)) |
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| 458 | |
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| 459 | # Initialize the new context with the new identity |
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| 460 | self.context = ABAC.Context() |
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| 461 | if self.me: |
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| 462 | self.context.load_id_file(self.me) |
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| 463 | self.context.load_directory("%s/certs" % dir) |
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| 464 | self.save_dir = dir |
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| 465 | except EnvironmentError, e: |
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| 466 | self.lock.release() |
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| 467 | raise e |
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| 468 | except pickle.PickleError, e: |
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| 469 | self.lock.release() |
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| 470 | raise e |
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| 471 | self.lock.release() |
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| 472 | |
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| 473 | @staticmethod |
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| 474 | def encode_credential(c): |
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| 475 | return '%s <- %s' % (c.head().string(), c.tail().string()) |
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| 476 | |
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| 477 | def get_creds_for_principal(self, fid): |
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| 478 | look_for = set(["%s" % fid]) |
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| 479 | found_attrs = set() |
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| 480 | next_look = set() |
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| 481 | found = set([]) |
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| 482 | |
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| 483 | self.lock.acquire() |
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| 484 | while look_for: |
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| 485 | for c in self.context.credentials(): |
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| 486 | tail = c.tail() |
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| 487 | # XXX: This needs to be more aggressive for linked stuff |
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| 488 | if tail.string() in look_for and c not in found: |
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| 489 | found.add(c) |
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| 490 | next_look.add(c.head().string()) |
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| 491 | |
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| 492 | look_for = next_look |
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| 493 | next_look = set() |
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| 494 | |
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| 495 | return found |
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| 496 | |
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| 497 | def __str__(self): |
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| 498 | |
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| 499 | self.lock.acquire() |
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| 500 | rv = "%s" % self.fedid |
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| 501 | add = join([abac_authorizer.encode_credential(c) |
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| 502 | for c in self.context.credentials()], '\n'); |
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| 503 | if add: rv += "\n%s" % add |
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| 504 | self.lock.release() |
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| 505 | return rv |
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| 506 | |
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