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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2009-2011 New Dream Network
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include <boost/config/warning_disable.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix.hpp>
#include "common/config.h"
#include "common/debug.h"
#include "OSDCap.h"
using std::ostream;
using std::vector;
ostream& operator<<(ostream& out, rwxa_t p)
{
if (p == OSD_CAP_ANY)
return out << "*";
if (p & OSD_CAP_R)
out << "r";
if (p & OSD_CAP_W)
out << "w";
if ((p & OSD_CAP_X) == OSD_CAP_X) {
out << "x";
} else {
if (p & OSD_CAP_CLS_R)
out << " class-read";
if (p & OSD_CAP_CLS_W)
out << " class-write";
}
return out;
}
ostream& operator<<(ostream& out, const OSDCapSpec& s)
{
if (s.allow)
return out << s.allow;
if (s.class_name.length())
return out << "class '" << s.class_name << "' '" << s.class_allow << "'";
return out;
}
ostream& operator<<(ostream& out, const OSDCapMatch& m)
{
if (m.auid != -1LL) {
out << "auid " << m.auid << " ";
}
if (m.object_prefix.length()) {
out << "object_prefix " << m.object_prefix << " ";
}
if (m.pool_name.length()) {
out << "pool " << m.pool_name << " ";
}
return out;
}
bool OSDCapMatch::is_match(const string& pn, int64_t pool_auid, const string& object) const
{
if (auid >= 0) {
if (auid != pool_auid)
return false;
}
if (pool_name.length()) {
if (pool_name != pn)
return false;
}
if (object_prefix.length()) {
if (object.find(object_prefix) != 0)
return false;
}
return true;
}
ostream& operator<<(ostream& out, const OSDCapGrant& g)
{
return out << "grant(" << g.match << g.spec << ")";
}
bool OSDCap::allow_all() const
{
for (vector<OSDCapGrant>::const_iterator p = grants.begin(); p != grants.end(); ++p)
if (p->spec.allow_all())
return true;
return false;
}
void OSDCap::set_allow_all()
{
grants.clear();
grants.push_back(OSDCapGrant(OSDCapMatch(), OSDCapSpec(OSD_CAP_ANY)));
}
bool OSDCap::is_capable(const string& pool_name, int64_t pool_auid,
const string& object, bool op_may_read,
bool op_may_write, bool op_may_class_read,
bool op_may_class_write) const
{
rwxa_t allow = 0;
for (vector<OSDCapGrant>::const_iterator p = grants.begin();
p != grants.end(); ++p) {
if (p->match.is_match(pool_name, pool_auid, object)) {
allow |= p->spec.allow;
if ((op_may_read && !(allow & OSD_CAP_R)) ||
(op_may_write && !(allow & OSD_CAP_W)) ||
(op_may_class_read && !(allow & OSD_CAP_CLS_R)) ||
(op_may_class_write && !(allow & OSD_CAP_CLS_W)))
continue;
return true;
}
}
return false;
}
// grammar
namespace qi = boost::spirit::qi;
namespace ascii = boost::spirit::ascii;
namespace phoenix = boost::phoenix;
template <typename Iterator>
struct OSDCapParser : qi::grammar<Iterator, OSDCap()>
{
OSDCapParser() : OSDCapParser::base_type(osdcap)
{
using qi::char_;
using qi::int_;
using qi::lexeme;
using qi::alnum;
using qi::_val;
using qi::_1;
using qi::_2;
using qi::_3;
using qi::eps;
using qi::lit;
quoted_string %=
lexeme['"' >> +(char_ - '"') >> '"'] |
lexeme['\'' >> +(char_ - '\'') >> '\''];
unquoted_word %= +(alnum | '_' | '-');
str %= quoted_string | unquoted_word;
spaces = +lit(' ');
// match := [pool[=]<poolname> | auid <123>] [object_prefix <prefix>]
pool_name %= -(spaces >> lit("pool") >> (lit('=') | spaces) >> str);
auid %= (spaces >> lit("auid") >> spaces >> int_);
object_prefix %= -(spaces >> lit("object_prefix") >> spaces >> str);
match = ( (auid >> object_prefix) [_val = phoenix::construct<OSDCapMatch>(_1, _2)] |
(pool_name >> object_prefix) [_val = phoenix::construct<OSDCapMatch>(_1, _2)]);
// rwxa := * | [r][w][x] [class-read] [class-write]
rwxa =
(spaces >> lit("*")[_val = OSD_CAP_ANY]) |
( eps[_val = 0] >>
(
spaces >>
( lit('r')[_val |= OSD_CAP_R] ||
lit('w')[_val |= OSD_CAP_W] ||
lit('x')[_val |= OSD_CAP_X] )) ||
( (spaces >> lit("class-read")[_val |= OSD_CAP_CLS_R]) ||
(spaces >> lit("class-write")[_val |= OSD_CAP_CLS_W]) ));
// capspec := * | rwx | class <name> [classcap]
capspec =
rwxa [_val = phoenix::construct<OSDCapSpec>(_1)] |
( spaces >> lit("class") >> spaces >> ((str >> spaces >> str) [_val = phoenix::construct<OSDCapSpec>(_1, _2)] |
str [_val = phoenix::construct<OSDCapSpec>(_1, string())] ));
// grant := allow match capspec
grant = (*lit(' ') >> lit("allow") >>
((capspec >> match) [_val = phoenix::construct<OSDCapGrant>(_2, _1)] |
(match >> capspec) [_val = phoenix::construct<OSDCapGrant>(_1, _2)]) >>
*lit(' '));
// osdcap := grant [grant ...]
grants %= (grant % (*lit(' ') >> (lit(';') | lit(',')) >> *lit(' ')));
osdcap = grants [_val = phoenix::construct<OSDCap>(_1)];
}
qi::rule<Iterator> spaces;
qi::rule<Iterator, unsigned()> rwxa;
qi::rule<Iterator, string()> quoted_string;
qi::rule<Iterator, string()> unquoted_word;
qi::rule<Iterator, string()> str;
qi::rule<Iterator, int()> auid;
qi::rule<Iterator, OSDCapSpec()> capspec;
qi::rule<Iterator, string()> pool_name;
qi::rule<Iterator, string()> object_prefix;
qi::rule<Iterator, OSDCapMatch()> match;
qi::rule<Iterator, OSDCapGrant()> grant;
qi::rule<Iterator, std::vector<OSDCapGrant>()> grants;
qi::rule<Iterator, OSDCap()> osdcap;
};
bool OSDCap::parse(const string& str, ostream *err)
{
OSDCapParser<string::const_iterator> g;
string::const_iterator iter = str.begin();
string::const_iterator end = str.end();
bool r = qi::phrase_parse(iter, end, g, ascii::space, *this);
if (r && iter == end)
return true;
// Make sure no grants are kept after parsing failed!
grants.clear();
if (err)
*err << "osdcap parse failed, stopped at '" << std::string(iter, end)
<< "' of '" << str << "'\n";
return false;
}
|
