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
|
/*
* Copyright (C) 2013 Red Hat, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Roman Rakus <rrakus@redhat.com>
*/
/*
* Common functions for indications used in Account provider
*/
#include <cmpimacs.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/inotify.h>
#include <limits.h>
#include <errno.h>
#include "indication_common.h"
#include <globals.h>
#include "LMI_Account.h"
#include "LMI_Group.h"
#include "LMI_Identity.h"
static const char* allowed_classes[] = {
LMI_Account_ClassName,
LMI_Group_ClassName,
LMI_Identity_ClassName,
NULL };
#define EVENT_SIZE (sizeof(struct inotify_event))
#define BUF_LEN (10 * EVENT_SIZE + NAME_MAX + 1)
#define PASSWD_FILE "/etc/passwd"
#define GROUP_FILE "/etc/group"
bool filter_checker(const CMPISelectExp *filter)
{
/*
* Support only simple conditions and only on allowed_classes
* and type of `sourceinstance ISA allowed_class'
*/
CMPIStatus st;
CMPISelectCond *sec = CMGetDoc(filter, &st);
if (!sec) return false;
CMPICount count = CMGetSubCondCountAndType(sec, NULL, &st);
if (count != 1) return false;
CMPISubCond *sub = CMGetSubCondAt(sec, 0, &st);
if (!sub) return false;
count = CMGetPredicateCount(sub, &st);
if (count != 1) return false;
CMPIPredicate *pred = CMGetPredicateAt(sub, 0, &st);
if (!pred) return false;
CMPIType type;
CMPIPredOp op;
CMPIString *lhs = NULL;
CMPIString *rhs = NULL;
st = CMGetPredicateData(pred, &type, &op, &lhs, &rhs);
if (st.rc != CMPI_RC_OK || op != CMPI_PredOp_Isa) return false;
const char *rhs_str = CMGetCharsPtr(rhs, &st);
if (!rhs_str) return false;
unsigned i = 0;
while (allowed_classes[i]) {
if (strcasecmp(rhs_str, allowed_classes[i++]) == 0) return true;
}
return false;
}
/*
* Returns last modification time for specified file name
*/
static struct timespec get_last_mod(const char* file)
{
struct stat buf = {0};
stat (file, &buf);
return buf.st_mtim;
}
/*
* Compares 2 timespecs
* return value is same like in strcmp
*/
static int timecmp(struct timespec a, struct timespec b)
{
if (a.tv_sec == b.tv_sec) {
if (a.tv_nsec == b.tv_nsec) {
return 0;
} else {
return (a.tv_nsec > b.tv_nsec ? 1 : -1);
}
} else {
return (a.tv_sec > b.tv_sec ? 1 : -1);
}
}
#define ADD_WATCH(fd, wd, file)\
(wd) = inotify_add_watch((fd), (file), IN_CLOSE_WRITE | IN_MODIFY |\
IN_DELETE | IN_DELETE_SELF);\
if ((wd) < 0) {\
goto bail;\
}\
bool watcher_init(AccountIndication *ind)
{
ind->wd_pwd = 0;
ind->wd_grp = 0;
ind->inotify_fd = inotify_init();
if (ind->inotify_fd < 0)
return false;
/* Get initial timestamps, at the beginning of watching. */
ind->last_pwd = get_last_mod(PASSWD_FILE);
ind->last_grp = get_last_mod(GROUP_FILE);
ADD_WATCH(ind->inotify_fd, ind->wd_pwd, PASSWD_FILE);
ADD_WATCH(ind->inotify_fd, ind->wd_grp, GROUP_FILE);
return true;
bail:
watcher_destroy(ind);
return false;
}
void watcher_destroy(AccountIndication *ind)
{
if (ind->inotify_fd >= 0) {
if (ind->wd_pwd > 0)
inotify_rm_watch(ind->inotify_fd, ind->wd_pwd);
if (ind->wd_grp > 0)
inotify_rm_watch(ind->inotify_fd, ind->wd_grp);
close(ind->inotify_fd);
ind->inotify_fd = -1;
}
}
bool watcher(AccountIndication *ind, void **data)
{
struct timespec curr_pwd, curr_grp;
char buffer[BUF_LEN];
if (ind->inotify_fd < 0)
return false;
do {
int len = 0, i = 0;
if ((len = read(ind->inotify_fd, buffer, BUF_LEN)) < 0 || len > (int) BUF_LEN) {
warn("account watcher: error reading from inotify fd: %s", strerror(errno));
watcher_destroy(ind);
watcher_init(ind);
return false;
}
while (i + (ssize_t) EVENT_SIZE < len) {
struct inotify_event *event = (struct inotify_event *) &buffer[i];
if (i + (ssize_t) EVENT_SIZE + event->len >= len) {
error("Unable to create watcher, inotify initialization failed");
watcher_destroy(ind);
watcher_init(ind);
return false;
}
switch (event->mask) {
case IN_MODIFY:
case IN_CLOSE_WRITE:
case IN_DELETE:
case IN_DELETE_SELF:
if (event->wd == ind->wd_grp) {
curr_grp = get_last_mod(GROUP_FILE);
if (timecmp(ind->last_grp, curr_grp) == -1) {
ind->last_grp = curr_grp;
return true;
}
} else {
curr_pwd = get_last_mod(GROUP_FILE);
if (timecmp(ind->last_pwd, curr_pwd) == -1) {
ind->last_pwd = curr_pwd;
return true;
}
}
break;
case IN_IGNORED:
if (event->wd == ind->wd_grp) {
ADD_WATCH(ind->inotify_fd, ind->wd_grp, GROUP_FILE);
curr_grp = get_last_mod(GROUP_FILE);
if (timecmp(ind->last_grp, curr_grp) == -1) {
ind->last_grp = curr_grp;
return true;
}
} else {
ADD_WATCH(ind->inotify_fd, ind->wd_pwd, PASSWD_FILE);
curr_pwd = get_last_mod(GROUP_FILE);
if (timecmp(ind->last_pwd, curr_pwd) == -1) {
ind->last_pwd = curr_pwd;
return true;
}
}
break;
}
i += EVENT_SIZE + event->len;
}
} while (1);
bail:
return false;
}
|
