~drizzle-trunk/drizzle/development

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 *
 *  Copyright (C) 2010 Monty Taylor <mordred@inaugust.com>
 *  Copyright (C) 2011 Canonical, Ltd.
 *  Author: Clint Byrum <clint.byrum@canonical.com>
 *
 *  Copied from simple_user_policy
 *
 *  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 of the License.
 *
 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */


#pragma once

#include <iosfwd>

#include <boost/regex.hpp>
#include <boost/unordered_map.hpp>
#include <boost/thread/mutex.hpp>

#include <drizzled/configmake.h>
#include <drizzled/plugin/authorization.h>

namespace fs= boost::filesystem;

namespace regex_policy
{

static const fs::path DEFAULT_POLICY_FILE= SYSCONFDIR "/drizzle.policy";

static const char *comment_regex = "^[[:space:]]*#.*$";
static const char *empty_regex = "^[[:space:]]*$";
static const char *table_match_regex = "^([^ ]+) table\\=([^ ]+) (ACCEPT|DENY)$";
static const char *process_match_regex = "^([^ ]+) process\\=([^ ]+) (ACCEPT|DENY)$";
static const char *schema_match_regex = "^([^ ]+) schema\\=([^ ]+) (ACCEPT|DENY)$";
/* These correspond to the parenthesis above and must stay in sync */
static const int MATCH_REGEX_USER_POS= 1;
static const int MATCH_REGEX_OBJECT_POS= 2;
static const int MATCH_REGEX_ACTION_POS= 3;

typedef enum 
{
  POLICY_ACCEPT,
  POLICY_DENY
} PolicyAction;

class PolicyItem
{
  const std::string user;
  const std::string object;
  const boost::regex user_re;
  const boost::regex object_re;
  PolicyAction action;
public:
  PolicyItem(const std::string &u, const std::string &obj, const std::string &act) :
    user(u),
    object(obj),
    user_re(u),
    object_re(obj)
  { 
    if (act == "ACCEPT")
    {
      action = POLICY_ACCEPT;
    }
    else if (act == "DENY")
    {
      action = POLICY_DENY;
    }
    else
    {
      throw std::exception();
    }
  }
  bool userMatches(std::string &str);
  bool objectMatches(std::string &object_id);
  bool isRestricted();
  const std::string&getUser() const
  {
    return user;
  }
  const std::string&getObject() const
  {
    return object;
  }
  const char *getAction() const
  {
    return action == POLICY_ACCEPT ? "ACCEPT" : "DENY";
  }
};

typedef std::list<PolicyItem *> PolicyItemList;
typedef boost::unordered_map<std::string, bool> CheckMap;

static boost::mutex check_cache_mutex;

class CheckItem
{
  std::string user;
  std::string object;
  std::string key;
  bool has_cached_result;
  bool cached_result;
  CheckMap **check_cache;
public:
  CheckItem(const std::string &u, const std::string &obj, CheckMap **check_cache);
  bool operator()(PolicyItem *p);
  bool hasCachedResult() const
  {
    return has_cached_result;
  }
  bool getCachedResult() const
  {
    return cached_result;
  }
  void setCachedResult(bool result);
};

inline bool PolicyItem::userMatches(std::string &str)
{
  return boost::regex_match(str, user_re);
}

inline bool PolicyItem::objectMatches(std::string &object_id)
{
  return boost::regex_match(object_id, object_re);
}

inline bool PolicyItem::isRestricted()
{
  return action == POLICY_DENY ? true : false;
}

void clearPolicyItemList(PolicyItemList policies);

class Policy :
  public drizzled::plugin::Authorization
{
public:
  Policy(const fs::path &f_path) :
    drizzled::plugin::Authorization("Regex Policy"), policy_file(f_path), error(),
    table_check_cache(NULL), schema_check_cache(NULL), process_check_cache(NULL)
  { }

  virtual bool restrictSchema(const drizzled::identifier::User &user_ctx,
                              const drizzled::identifier::Schema& schema);

  virtual bool restrictProcess(const drizzled::identifier::User &user_ctx,
                               const drizzled::identifier::User &session_ctx);

  virtual bool restrictTable(const drizzled::identifier::User& user_ctx,
                             const drizzled::identifier::Table& table);

  bool loadFile();
  std::stringstream &getError() { return error; }
  ~Policy();
private:
  bool restrictObject(const drizzled::identifier::User &user_ctx,
                                   const std::string &obj, const PolicyItemList &policies,
                                   CheckMap **check_cache);
  fs::path policy_file;
  std::stringstream error;
  PolicyItemList table_policies;
  PolicyItemList schema_policies;
  PolicyItemList process_policies;
  CheckMap *table_check_cache;
  CheckMap *schema_check_cache;
  CheckMap *process_check_cache;
};

} /* namespace regex_policy */