| # Authors: Karl MacMillan <kmacmillan@mentalrootkit.com> |
| # |
| # Copyright (C) 2006 Red Hat |
| # see file 'COPYING' for use and warranty information |
| # |
| # This program is free software; you can redistribute it and/or |
| # modify it under the terms of the GNU General Public License as |
| # published by the Free Software Foundation; version 2 only |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; if not, write to the Free Software |
| # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| # |
| |
| """ |
| Classes and functions for the output of reference policy modules. |
| |
| This module takes a refpolicy.Module object and formats it for |
| output using the ModuleWriter object. By separating the output |
| in this way the other parts of Madison can focus solely on |
| generating policy. This keeps the semantic / syntactic issues |
| cleanly separated from the formatting issues. |
| """ |
| |
| from . import refpolicy |
| from . import util |
| |
| if util.PY3: |
| from .util import cmp |
| |
| |
| class ModuleWriter: |
| def __init__(self): |
| self.fd = None |
| self.module = None |
| self.sort = True |
| self.requires = True |
| |
| def write(self, module, fd): |
| self.module = module |
| |
| if self.sort: |
| sort_filter(self.module) |
| |
| # FIXME - make this handle nesting |
| for node, depth in refpolicy.walktree(self.module, showdepth=True): |
| fd.write("%s\n" % str(node)) |
| |
| # Helper functions for sort_filter - this is all done old school |
| # C style rather than with polymorphic methods because this sorting |
| # is specific to output. It is not necessarily the comparison you |
| # want generally. |
| |
| # Compare two IdSets - we could probably do something clever |
| # with different here, but this works. |
| def id_set_cmp(x, y): |
| xl = util.set_to_list(x) |
| xl.sort() |
| yl = util.set_to_list(y) |
| yl.sort() |
| |
| if len(xl) != len(yl): |
| return cmp(xl[0], yl[0]) |
| for v in zip(xl, yl): |
| if v[0] != v[1]: |
| return cmp(v[0], v[1]) |
| return 0 |
| |
| # Compare two avrules |
| def avrule_cmp(a, b): |
| ret = id_set_cmp(a.src_types, b.src_types) |
| if ret is not 0: |
| return ret |
| ret = id_set_cmp(a.tgt_types, b.tgt_types) |
| if ret is not 0: |
| return ret |
| ret = id_set_cmp(a.obj_classes, b.obj_classes) |
| if ret is not 0: |
| return ret |
| |
| # At this point, who cares - just return something |
| return cmp(len(a.perms), len(b.perms)) |
| |
| # Compare two interface calls |
| def ifcall_cmp(a, b): |
| if a.args[0] != b.args[0]: |
| return cmp(a.args[0], b.args[0]) |
| return cmp(a.ifname, b.ifname) |
| |
| # Compare an two avrules or interface calls |
| def rule_cmp(a, b): |
| if isinstance(a, refpolicy.InterfaceCall): |
| if isinstance(b, refpolicy.InterfaceCall): |
| return ifcall_cmp(a, b) |
| else: |
| return id_set_cmp([a.args[0]], b.src_types) |
| else: |
| if isinstance(b, refpolicy.AVRule): |
| return avrule_cmp(a,b) |
| else: |
| return id_set_cmp(a.src_types, [b.args[0]]) |
| |
| def role_type_cmp(a, b): |
| return cmp(a.role, b.role) |
| |
| def sort_filter(module): |
| """Sort and group the output for readability. |
| """ |
| def sort_node(node): |
| c = [] |
| |
| # Module statement |
| for mod in node.module_declarations(): |
| c.append(mod) |
| c.append(refpolicy.Comment()) |
| |
| # Requires |
| for require in node.requires(): |
| c.append(require) |
| c.append(refpolicy.Comment()) |
| |
| # Rules |
| # |
| # We are going to group output by source type (which |
| # we assume is the first argument for interfaces). |
| rules = [] |
| rules.extend(node.avrules()) |
| rules.extend(node.interface_calls()) |
| rules.sort(key=util.cmp_to_key(rule_cmp)) |
| |
| cur = None |
| sep_rules = [] |
| for rule in rules: |
| if isinstance(rule, refpolicy.InterfaceCall): |
| x = rule.args[0] |
| else: |
| x = util.first(rule.src_types) |
| |
| if cur != x: |
| if cur: |
| sep_rules.append(refpolicy.Comment()) |
| cur = x |
| comment = refpolicy.Comment() |
| comment.lines.append("============= %s ==============" % cur) |
| sep_rules.append(comment) |
| sep_rules.append(rule) |
| |
| c.extend(sep_rules) |
| |
| |
| ras = [] |
| ras.extend(node.role_types()) |
| ras.sort(key=util.cmp_to_key(role_type_cmp)) |
| if len(ras): |
| comment = refpolicy.Comment() |
| comment.lines.append("============= ROLES ==============") |
| c.append(comment) |
| |
| |
| c.extend(ras) |
| |
| # Everything else |
| for child in node.children: |
| if child not in c: |
| c.append(child) |
| |
| node.children = c |
| |
| for node in module.nodes(): |
| sort_node(node) |
| |
| |