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e3fca60d11
This enables adding a priority to a rules in policy, finishing out the
priority work done to plumb priority support through the internals in
the previous patch.
Rules have a default priority of 0. The priority prefix can be added
before the other currently support rule prefixes, ie.
[priority prefix][audit qualifier][rule mode][owner]
If present a numerical priority can be assigned to the rule, where the
greater the number the higher the priority. Eg.
priority=1 audit file r /etc/passwd,
priority=-1 deny file w /etc/**,
Rule priority allows the rule with the highest priority to completely
override lower priority rules where they overlap. Within a given
priority level rules will accumulate in standard apparmor fashion.
Eg. given
priority=1 w /*c,
priority=0 r /a*,
priority=-1 k /*b*,
/abc, /bc, /ac .. will have permissions of w
/ab, /abb, /aaa, .. will have permissions of r
/b, /bcb, /bab, .. will have permissions of k
User specified rule priorities are currently capped at the arbitrary
values of 1000, and -1000.
Notes:
* not all rule types support the priority prefix. Rukes like
- network
- capability
- rlimits need to be reworked
need to be reworked to properly preserve the policy rule structure.
* this patch does not support priority on rule blocks
* this patch does not support using a variable in the priority value.
Signed-off-by: John Johansen <john.johansen@canonical.com>
86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
/*
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* Copyright (c) 2014
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* Canonical Ltd. (All rights reserved)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, contact Novell, Inc. or Canonical
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* Ltd.
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*/
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#ifndef __AA_AF_UNIX_H
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#define __AA_AF_UNIX_H
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#include "immunix.h"
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#include "network.h"
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#include "parser.h"
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#include "profile.h"
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#include "af_rule.h"
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int parse_unix_perms(const char *str_mode, perm32_t *perms, int fail);
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class unix_rule: public af_rule {
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void write_to_prot(std::ostringstream &buffer);
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bool write_addr(std::ostringstream &buffer, const char *addr);
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bool write_label(std::ostringstream &buffer, const char *label);
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void move_conditionals(struct cond_entry *conds);
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void move_peer_conditionals(struct cond_entry *conds);
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void downgrade_rule(Profile &prof);
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public:
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char *addr;
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char *peer_addr;
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bool downgrade = true;
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unix_rule(unsigned int type_p, audit_t audit_p, rule_mode_t rule_mode_p);
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unix_rule(perm32_t perms, struct cond_entry *conds,
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struct cond_entry *peer_conds);
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virtual ~unix_rule()
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{
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free(addr);
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free(peer_addr);
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};
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virtual bool valid_prefix(const prefixes &p, const char *&error) {
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// priority is partially supported for unix rules
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// rules that get downgraded to just network socket
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// won't support them but the fine grained do.
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if (p.owner) {
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error = "owner prefix not allowed on unix rules";
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return false;
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}
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return true;
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};
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virtual bool has_peer_conds(void) {
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return af_rule::has_peer_conds() || peer_addr;
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}
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virtual ostream &dump_local(ostream &os);
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virtual ostream &dump_peer(ostream &os);
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virtual int expand_variables(void);
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virtual int gen_policy_re(Profile &prof);
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// inherit is_mergable() from af_rule
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virtual int cmp(rule_t const &rhs) const
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{
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int res = af_rule::cmp(rhs);
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if (res)
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return res;
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unix_rule const &trhs = (rule_cast<unix_rule const &>(rhs));
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res = null_strcmp(addr, trhs.addr);
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if (res)
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return res;
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return null_strcmp(peer_addr, trhs.peer_addr);
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};
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protected:
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virtual void warn_once(const char *name) override;
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};
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#endif /* __AA_AF_UNIX_H */
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