| 1 | #!/usr/local/bin/python |
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| 2 | |
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| 3 | import sys, os |
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| 4 | import re |
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| 5 | import subprocess |
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| 6 | import os.path |
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| 7 | |
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| 8 | from string import join |
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| 9 | from optparse import OptionParser, OptionValueError |
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| 10 | from tempfile import mkdtemp |
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| 11 | |
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| 12 | from federation.fedid import fedid |
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| 13 | from federation.authorizer import abac_authorizer |
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| 14 | from federation.util import abac_split_cert, abac_pem_type |
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| 15 | |
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| 16 | |
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| 17 | class attribute: |
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| 18 | ''' |
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| 19 | Encapculate a principal/attribute/link tuple. |
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| 20 | ''' |
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| 21 | bad_attr = re.compile('[^a-zA-Z0-9_]+') |
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| 22 | def __init__(self, p, a, l=None): |
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| 23 | self.principal = p |
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| 24 | self.attr = attribute.bad_attr.sub('_', a) |
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| 25 | if l: self.link = attribute.bad_attr.sub('_', l) |
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| 26 | else: self.link = None |
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| 27 | |
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| 28 | def __str__(self): |
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| 29 | if self.link: |
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| 30 | return "%s.%s.%s" % (self.principal, self.attr, self.link) |
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| 31 | elif self.attr: |
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| 32 | return "%s.%s" % (self.principal, self.attr) |
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| 33 | else: |
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| 34 | return "%s" % self.principal |
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| 35 | |
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| 36 | class credential: |
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| 37 | ''' |
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| 38 | A Credential, that is the requisites (as attributes) and the assigned |
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| 39 | attribute (as principal, attr). If req is iterable, the requirements are |
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| 40 | an intersection/conjunction. |
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| 41 | ''' |
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| 42 | bad_attr = re.compile('[^a-zA-Z0-9_]+') |
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| 43 | def __init__(self, p, a, req): |
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| 44 | self.principal = p |
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| 45 | if isinstance(a, (tuple, list, set)) and len(a) == 1: |
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| 46 | self.attr = credential.bad_attr.sub('_', a[0]) |
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| 47 | else: |
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| 48 | self.attr = credential.bad_attr.sub('_', a) |
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| 49 | self.req = req |
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| 50 | |
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| 51 | def __str__(self): |
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| 52 | if isinstance(self.req, (tuple, list, set)): |
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| 53 | return "%s.%s <- %s" % (self.principal, self.attr, |
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| 54 | join(["%s" % r for r in self.req], ' & ')) |
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| 55 | else: |
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| 56 | return "%s.%s <- %s" % (self.principal, self.attr, self.req) |
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| 57 | |
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| 58 | # Mappinng generation function and the access parser throw these when there is |
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| 59 | # a parsing problem. |
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| 60 | class parse_error(RuntimeError): pass |
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| 61 | |
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| 62 | # Error creating a credential |
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| 63 | class credential_error(RuntimeError): pass |
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| 64 | |
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| 65 | # Functions to parse the individual access maps as well as an overall function |
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| 66 | # to parse generic ones. The specific ones create a credential to local |
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| 67 | # attributes mapping and the global one creates the access policy credentials. |
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| 68 | |
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| 69 | # All the local parsing functions get the unparsed remainder of the line |
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| 70 | # (after the three-name and the attribute it maps to), the credential list to |
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| 71 | # add the new ABAC credential(s) that will be mapped into the loacl |
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| 72 | # credentials, the fedid of this entity, a dict mapping the local credentials |
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| 73 | # to ABAC credentials that are required to exercise those local rights and the |
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| 74 | # three-name (p, gp, gu) that is being mapped. |
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| 75 | def parse_emulab(l, creds, me, to_id, p, gp, gu, lr): |
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| 76 | ''' |
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| 77 | Parse the emulab (project, allocation_user, access_user) format. Access |
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| 78 | users are deprecates and allocation users used for both. This fuction |
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| 79 | collapses them. |
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| 80 | ''' |
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| 81 | right_side_str = '\s*,\s*\(\s*%s\s*,\s*%s\s*,\s*%s\s*\)' % \ |
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| 82 | (id_same_str, id_same_str,id_same_str) |
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| 83 | |
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| 84 | m = re.match(right_side_str, l) |
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| 85 | if m: |
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| 86 | project, user = m.group(1,2) |
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| 87 | # Resolve "<same>"s in project and user |
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| 88 | if project == '<same>': |
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| 89 | if gp is not None: |
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| 90 | project = gp |
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| 91 | else: |
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| 92 | raise parse_error("Project cannot be decisively mapped: %s" % l) |
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| 93 | if user == '<same>': |
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| 94 | if gu is not None: |
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| 95 | user = gu |
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| 96 | else: |
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| 97 | raise parse_error("User cannot be decisively mapped: %s" % l) |
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| 98 | |
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| 99 | # Create a semi-mnemonic name for the destination credential (the one |
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| 100 | # that will be mapped to the local attributes |
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| 101 | if gp and gu: |
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| 102 | a = 'project_%s_user_%s' % (gp, gu) |
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| 103 | elif gp: |
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| 104 | a = 'project_%s' % gp |
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| 105 | elif gu: |
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| 106 | a = 'user_%s' % gu |
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| 107 | else: |
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| 108 | raise parse_error("No mapping for %s/%s!?" % (gp, gu)) |
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| 109 | |
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| 110 | # Store the creds and map entries |
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| 111 | c = credential(me, a, |
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| 112 | [attribute(p, x, lr) for x in (gp, gu) if x is not None]) |
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| 113 | creds.add(c) |
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| 114 | if (project, user) in to_id: to_id[(project,user)].append(c) |
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| 115 | else: to_id[(project,user)] = [ c ] |
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| 116 | else: |
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| 117 | raise parse_error("Badly formatted local mapping: %s" % l) |
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| 118 | |
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| 119 | |
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| 120 | def parse_protogeni(l, creds, me, to_id, p, gp, gu, lr): |
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| 121 | ''' |
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| 122 | Parse the protoGENI (cert, user, user_key, cert_pw) format. |
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| 123 | ''' |
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| 124 | right_side_str = '\s*,\s*\(\s*(%s)\s*,\s*(%s)\s*,\s*(%s)\s*,\s*(%s)\s*\)' \ |
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| 125 | % (path_str, id_str, path_str, id_str) |
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| 126 | |
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| 127 | m = re.match(right_side_str, l) |
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| 128 | if m: |
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| 129 | cert, user, key, pw = m.group(1,2,3,4) |
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| 130 | # The credential is formed from just the path (with / mapped to _) and |
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| 131 | # the username. |
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| 132 | acert = re.sub('/', '_', cert) |
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| 133 | |
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| 134 | a = "cert_%s_user_%s" % (acert, user) |
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| 135 | |
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| 136 | # Store em |
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| 137 | c = credential(me, a, |
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| 138 | [attribute(p, x, lr) for x in (gp, gu) if x is not None]) |
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| 139 | creds.add(c) |
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| 140 | if (cert, user, key, pw) in to_id: |
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| 141 | to_id[(cert, user, key, pw)].append(c) |
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| 142 | else: |
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| 143 | to_id[(cert, user, key, pw)] = [ c ] |
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| 144 | else: |
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| 145 | raise parse_error("Badly formatted local mapping: %s" % l) |
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| 146 | |
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| 147 | def parse_dragon(l, creds, me, to_id, p, gp, gu, lr): |
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| 148 | ''' |
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| 149 | Parse the dragon (repository_name) version. |
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| 150 | ''' |
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| 151 | right_side_str = '\s*,\s*\(\s*(%s)\s*\)' % \ |
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| 152 | (id_str) |
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| 153 | |
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| 154 | m = re.match(right_side_str, l) |
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| 155 | if m: |
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| 156 | repo= m.group(1) |
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| 157 | c = credential(me, 'repo_%s' % repo, |
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| 158 | [attribute(p, x, lr) for x in (gp, gu) if x is not None]) |
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| 159 | creds.add(c) |
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| 160 | if repo in to_id: to_id[repo].append(c) |
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| 161 | else: to_id[repo] = [ c ] |
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| 162 | else: |
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| 163 | raise parse_error("Badly formatted local mapping: %s" % l) |
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| 164 | |
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| 165 | def parse_skel(l, creds, me, to_id, p, gp, gu, lr): |
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| 166 | ''' |
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| 167 | Parse the skeleton (local_attr) version. |
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| 168 | ''' |
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| 169 | right_side_str = '\s*,\s*\(\s*(%s)\s*\)' % \ |
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| 170 | (id_str) |
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| 171 | |
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| 172 | m = re.match(right_side_str, l) |
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| 173 | if m: |
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| 174 | lattr = m.group(1) |
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| 175 | c = credential(me, 'lattr_%s' % lattr, |
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| 176 | [attribute(p, x, lr) for x in (gp, gu) if x is not None]) |
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| 177 | creds.add(c) |
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| 178 | if lattr in to_id: to_id[lattr].append(c) |
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| 179 | else: to_id[lattr] = [ c ] |
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| 180 | else: |
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| 181 | raise parse_error("Badly formatted local mapping: %s" % l) |
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| 182 | |
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| 183 | # internal plug-ins have no local attributes. |
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| 184 | def parse_internal(l, creds, me, to_id, p, gp, gu, lr): pass |
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| 185 | |
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| 186 | |
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| 187 | def parse_access(fn, mapper): |
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| 188 | """ |
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| 189 | Parse the access file, calling out to the mapper to parse specific |
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| 190 | credential types. Mappers are above this code. |
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| 191 | """ |
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| 192 | creds = set() |
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| 193 | to_id = { } |
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| 194 | f = open(fn, "r") |
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| 195 | for i, l in enumerate(f): |
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| 196 | try: |
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| 197 | if comment_re.match(l): |
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| 198 | continue |
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| 199 | else: |
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| 200 | m = line_re.match(l) |
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| 201 | if m: |
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| 202 | p, da = m.group(1, 4) |
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| 203 | gp, gu = m.group(2, 3) |
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| 204 | if gp == '<any>': gp = None |
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| 205 | if gu == '<any>': gu = None |
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| 206 | |
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| 207 | creds.add(credential(me, da, |
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| 208 | [attribute(p, x, delegation_link) \ |
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| 209 | for x in (gp, gu) \ |
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| 210 | if x is not None])) |
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| 211 | if m.group(5) and mapper: |
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| 212 | mapper(m.group(5), creds, me, to_id, p, gp, gu, |
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| 213 | delegation_link) |
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| 214 | else: |
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| 215 | raise parse_error('Syntax error') |
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| 216 | except parse_error, e: |
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| 217 | f.close() |
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| 218 | raise parse_error('Error on line %d of %s: %s' % \ |
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| 219 | (i, fn, e.message)) |
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| 220 | f.close() |
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| 221 | |
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| 222 | return creds, to_id |
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| 223 | |
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| 224 | |
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| 225 | |
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| 226 | class access_opts(OptionParser): |
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| 227 | ''' |
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| 228 | Parse the options for this program. Most are straightforward, but the |
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| 229 | mapper uses a callback to convert from a string to a local mapper function. |
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| 230 | ''' |
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| 231 | # Valid mappers |
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| 232 | mappers = { |
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| 233 | 'emulab': parse_emulab, |
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| 234 | 'dragon': parse_dragon, |
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| 235 | 'internal': parse_internal, |
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| 236 | 'skel': parse_skel, |
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| 237 | 'protogeni': parse_protogeni, |
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| 238 | } |
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| 239 | |
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| 240 | @staticmethod |
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| 241 | def parse_mapper(opt, s, val, parser, dest): |
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| 242 | if val in access_opts.mappers: |
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| 243 | setattr(parser.values, dest, access_opts.mappers[val]) |
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| 244 | else: |
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| 245 | raise OptionValueError('%s must be one of %s' % \ |
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| 246 | (s, join(access_opts.mappers.keys(), ', '))) |
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| 247 | |
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| 248 | def __init__(self): |
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| 249 | OptionParser.__init__(self, usage='%prog [opts] file [...]') |
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| 250 | self.add_option('--cert', dest='cert', default=None, |
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| 251 | help='my fedid as an X.509 certificate') |
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| 252 | self.add_option('--key', dest='key', default=None, |
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| 253 | help='key for the certificate') |
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| 254 | self.add_option('--dir', dest='dir', default=None, |
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| 255 | help='Output directory for credentials') |
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| 256 | self.add_option('--type', action='callback', nargs=1, type='str', |
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| 257 | callback=access_opts.parse_mapper, |
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| 258 | callback_kwargs = { 'dest': 'mapper'}, |
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| 259 | help='Type of access file to parse. One of %s. ' %\ |
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| 260 | join(access_opts.mappers.keys(), ', ') + \ |
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| 261 | 'Omit for generic parsing.') |
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| 262 | self.add_option('--quiet', dest='quiet', action='store_true', |
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| 263 | default=False, |
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| 264 | help='Do not print credential to local attribute map') |
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| 265 | self.add_option('--create-creds', action='store_true', |
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| 266 | dest='create_creds', default=False, |
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| 267 | help='create credentials for rules. Requires ' + \ |
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| 268 | '--cert, --key, and --dir to be given.') |
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| 269 | self.add_option('--file', dest='file', default=None, |
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| 270 | help='Access DB to parse. If this is present, ' + \ |
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| 271 | 'omit the positional filename') |
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| 272 | self.add_option('--mapfile', dest='map', default=None, |
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| 273 | help='File for the attribute to local authorization data') |
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| 274 | self.add_option('--no-delegate', action='store_false', dest='delegate', |
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| 275 | default=True, |
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| 276 | help='do not accept delegated attributes with the ' +\ |
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| 277 | 'acting_for linking role') |
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| 278 | self.add_option('--auth', action='store_true', dest='create_auth', |
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| 279 | default=False, help='create a full ABAC authorizer') |
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| 280 | self.add_option('--debug', action='store_true', dest='debug', |
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| 281 | default=False, help='Just print actions') |
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| 282 | self.set_defaults(mapper=None) |
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| 283 | |
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| 284 | def create_creds(creds, cert, key, dir, debug=False, |
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| 285 | creddy='/usr/local/bin/creddy'): |
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| 286 | ''' |
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| 287 | Make the creddy calls to create the attributes from the list of credential |
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| 288 | objects in the creds parameter. |
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| 289 | ''' |
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| 290 | def attrs(r): |
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| 291 | ''' |
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| 292 | Convert an attribute into creddy --subject-id and --subject-role |
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| 293 | parameters |
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| 294 | ''' |
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| 295 | if r.principal and r.link and r.attr: |
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| 296 | return ['--subject-id=%s' % r.principal, |
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| 297 | '--subject-role=%s.%s' % (r.attr, r.link), |
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| 298 | ] |
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| 299 | elif r.principal and r.attr: |
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| 300 | return ['--subject-id=%s' % r.principal, |
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| 301 | '--subject-role=%s' %r.attr] |
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| 302 | elif r.principal: |
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| 303 | return ['--subject-id=%s' % r.prinicpal] |
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| 304 | else: |
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| 305 | raise parse_error('Attribute without a principal?') |
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| 306 | |
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| 307 | # main line of create_creds |
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| 308 | for i, c in enumerate(creds): |
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| 309 | cmd = [creddy, '--attribute', '--issuer=%s' % cert, '--key=%s' % key, |
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| 310 | '--role=%s' % c.attr, '--out=%s/cred%d_attr.der' % (dir, i)] |
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| 311 | for r in c.req: |
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| 312 | cmd.extend(attrs(r)) |
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| 313 | if debug: |
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| 314 | print join(cmd) |
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| 315 | else: |
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| 316 | rv = subprocess.call(cmd) |
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| 317 | if rv != 0: |
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| 318 | raise credential_error("%s: %d" % (join(cmd), rv)) |
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| 319 | |
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| 320 | def clear_dir(dir): |
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| 321 | for path, dirs, files in os.walk(dir, topdown=False): |
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| 322 | for f in files: os.unlink(os.path.join(path, f)) |
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| 323 | for d in dirs: os.rmdir(os.path.join(path, d)) |
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| 324 | |
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| 325 | # Regular expressions and parts thereof for parsing |
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| 326 | comment_re = re.compile('^\s*#|^$') |
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| 327 | fedid_str = 'fedid:([0-9a-fA-F]{40})' |
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| 328 | id_str = '[a-zA-Z][\w_-]*' |
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| 329 | path_str = '[a-zA-Z_/\.-]+' |
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| 330 | id_any_str = '(%s|<any>)' % id_str |
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| 331 | id_same_str = '(%s|<same>)' % id_str |
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| 332 | left_side_str = '\(\s*%s\s*,\s*%s\s*,\s*%s\s*\)' % \ |
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| 333 | (fedid_str, id_any_str, id_any_str) |
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| 334 | right_side_str = '(%s)(\s*,\s*\(.*\))?' % (id_str) |
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| 335 | line_re = re.compile('%s\s*->\s*%s' % (left_side_str, right_side_str)) |
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| 336 | |
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| 337 | p = access_opts() |
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| 338 | opts, args = p.parse_args() |
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| 339 | |
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| 340 | cert, key = None, None |
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| 341 | delete_certs = False |
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| 342 | delete_creds = False |
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| 343 | |
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| 344 | if opts.file: |
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| 345 | args.append(opts.file) |
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| 346 | |
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| 347 | # Validate arguments |
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| 348 | if len(args) < 1: |
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| 349 | sys.exit('No filenames given to parse') |
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| 350 | |
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| 351 | if opts.key: |
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| 352 | if not os.access(opts.key, os.R_OK): |
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| 353 | key = opts.key |
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| 354 | else: |
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| 355 | sys.exit('Cannot read key (%s)' % opts.key) |
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| 356 | |
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| 357 | if opts.dir: |
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| 358 | if not os.access(opts.dir, os.F_OK): |
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| 359 | try: |
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| 360 | os.mkdir(opts.dir, 0700) |
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| 361 | except EnvironmentError, e: |
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| 362 | sys.exit("Cannot create %s: %s" % (e.filename, e.strerror)) |
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| 363 | if not os.path.isdir(opts.dir): |
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| 364 | sys.exit('%s is not a directory' % opts.dir) |
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| 365 | elif not os.access(opts.dir, os.W_OK): |
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| 366 | sys.exit('%s is not writable' % opts.dir) |
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| 367 | |
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| 368 | if opts.create_auth: |
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| 369 | creds_dir = mkdtemp() |
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| 370 | delete_creds = True |
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| 371 | auth_dir = opts.dir |
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| 372 | else: |
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| 373 | creds_dir = opts.dir |
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| 374 | auth_dir = None |
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| 375 | |
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| 376 | if opts.delegate: delegation_link = 'acting_for' |
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| 377 | else: delegation_link = None |
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| 378 | |
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| 379 | if not opts.mapper and (opts.map or opts.debug): |
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| 380 | print >>sys.stderr, "No --type specified, mapping file will be empty." |
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| 381 | |
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| 382 | if opts.cert: |
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| 383 | try: |
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| 384 | me = fedid(file=opts.cert) |
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| 385 | except EnvironmentError, e: |
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| 386 | sys.exit('Bad --cert: %s (%s)' % (e.strerror, e.filename or '?!')) |
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| 387 | |
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| 388 | if not opts.key: |
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| 389 | if abac_pem_type(opts.cert) == 'both': |
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| 390 | key, cert = abac_split_cert(opts.cert) |
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| 391 | delete_certs = True |
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| 392 | else: |
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| 393 | cert = opts.cert |
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| 394 | else: |
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| 395 | print >>sys.stderr, 'No --cert, using dummy fedid' |
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| 396 | me = fedid(hexstr='0123456789012345678901234567890123456789') |
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| 397 | cert = None |
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| 398 | |
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| 399 | # The try block makes sure that credentials split into tmp files are deleted |
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| 400 | try: |
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| 401 | # Do the parsing |
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| 402 | for fn in args: |
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| 403 | try: |
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| 404 | creds, to_id = parse_access(fn, opts.mapper) |
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| 405 | except parse_error, e: |
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| 406 | print >> sys.stderr, "%s" % e |
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| 407 | continue |
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| 408 | |
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| 409 | except EnvironmentError, e: |
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| 410 | print >>sys.stderr, "File error %s: %s" % \ |
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| 411 | (e.filename or '!?', e.strerror) |
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| 412 | continue |
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| 413 | |
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| 414 | # Credential output |
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| 415 | if opts.create_creds: |
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| 416 | if all([cert, key, opts.dir]): |
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| 417 | try: |
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| 418 | create_creds([c for c in creds if c.principal == me], |
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| 419 | cert, key, creds_dir, opts.debug) |
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| 420 | except credential_error, e: |
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| 421 | sys.exit('Credential creation failed: %s' % e) |
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| 422 | else: |
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| 423 | print >>sys.stderr, 'Cannot create credentials. ' + \ |
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| 424 | 'Missing parameter' |
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| 425 | |
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| 426 | # Local map output |
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| 427 | if opts.map or opts.debug: |
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| 428 | try: |
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| 429 | if opts.map and opts.map != '-' and not opts.debug: |
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| 430 | f = open(opts.map, 'w') |
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| 431 | else: |
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| 432 | f = sys.stdout |
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| 433 | for k, c in to_id.items(): |
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| 434 | # Keys are either a single string or a tuple of them; join |
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| 435 | # the tuples into a comma-separated string. |
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| 436 | if isinstance(k, basestring): rhs = k |
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| 437 | else: rhs = join(k, ', ') |
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| 438 | |
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| 439 | for a in set(["%s.%s" % (x.principal, x.attr) for x in c]): |
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| 440 | print >>f, "%s -> (%s)" % (a, rhs) |
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| 441 | except EnvironmentError, e: |
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| 442 | sys.exit("Cannot open %s: %s" % (e.filename or '!?', |
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| 443 | e.strerror)) |
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| 444 | |
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| 445 | # Create an authorizer if requested. |
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| 446 | if opts.create_auth: |
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| 447 | clear_dir(auth_dir) |
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| 448 | try: |
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| 449 | # Pass in the options rather than the potentially split key |
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| 450 | # because abac_authorizer will split it and store it |
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| 451 | # internally. The opts.cert may get split twice, but we won't |
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| 452 | # lose one. |
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| 453 | a = abac_authorizer(key=opts.key, me=opts.cert, |
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| 454 | certs=creds_dir, save=auth_dir) |
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| 455 | a.save(auth_dir) |
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| 456 | except EnvironmentError, e: |
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| 457 | sys.exit("Can't create or write %s: %s" % \ |
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| 458 | (e.filename, e.strerror)) |
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| 459 | except abac_authorizer.bad_cert_error, e: |
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| 460 | sys.exit("Error creating authorizer: %s" % e) |
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| 461 | |
|---|
| 462 | finally: |
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| 463 | try: |
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| 464 | if delete_certs: |
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| 465 | if cert: os.unlink(cert) |
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| 466 | if key: os.unlink(key) |
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| 467 | if delete_creds and creds_dir: |
|---|
| 468 | clear_dir(creds_dir) |
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| 469 | os.rmdir(creds_dir) |
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| 470 | except EnvironmentError, e: |
|---|
| 471 | sys.exit("Can't remove %s: %s" % ( e.filename, e.strerror)) |
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