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
|
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <sys/klog.h>
#include <sys/prctl.h>
#include <sys/uio.h>
#include "libaudit.h"
#include "LogAudit.h"
LogAudit::LogAudit(LogBuffer *buf, LogReader *reader, int fdDmsg)
: SocketListener(getLogSocket(), false)
, logbuf(buf)
, reader(reader)
, fdDmesg(-1) {
logDmesg();
fdDmesg = fdDmsg;
}
bool LogAudit::onDataAvailable(SocketClient *cli) {
prctl(PR_SET_NAME, "logd.auditd");
struct audit_message rep;
if (audit_get_reply(cli->getSocket(), &rep, GET_REPLY_BLOCKING, 0) < 0) {
SLOGE("Failed on audit_get_reply with error: %s", strerror(errno));
return false;
}
logPrint("type=%d %.*s", rep.nlh.nlmsg_type, rep.nlh.nlmsg_len, rep.data);
return true;
}
#define AUDIT_LOG_ID LOG_ID_MAIN
#define AUDIT_LOG_PRIO ANDROID_LOG_WARN
int LogAudit::logPrint(const char *fmt, ...) {
if (fmt == NULL) {
return -EINVAL;
}
va_list args;
char *str = NULL;
va_start(args, fmt);
int rc = vasprintf(&str, fmt, args);
va_end(args);
if (rc < 0) {
return rc;
}
if (fdDmesg >= 0) {
struct iovec iov[2];
iov[0].iov_base = str;
iov[0].iov_len = strlen(str);
iov[1].iov_base = const_cast<char *>("\n");
iov[1].iov_len = 1;
writev(fdDmesg, iov, sizeof(iov) / sizeof(iov[0]));
}
pid_t pid = getpid();
pid_t tid = gettid();
uid_t uid = getuid();
log_time now;
static const char audit_str[] = " audit(";
char *timeptr = strstr(str, audit_str);
char *cp;
if (timeptr
&& ((cp = now.strptime(timeptr + sizeof(audit_str) - 1, "%s.%q")))
&& (*cp == ':')) {
memcpy(timeptr + sizeof(audit_str) - 1, "0.0", 3);
strcpy(timeptr + sizeof(audit_str) - 1 + 3, cp);
} else {
now.strptime("", ""); // side effect of setting CLOCK_REALTIME
}
static const char pid_str[] = " pid=";
char *pidptr = strstr(str, pid_str);
if (pidptr && isdigit(pidptr[sizeof(pid_str) - 1])) {
cp = pidptr + sizeof(pid_str) - 1;
pid = 0;
while (isdigit(*cp)) {
pid = (pid * 10) + (*cp - '0');
++cp;
}
tid = pid;
uid = logbuf->pidToUid(pid);
strcpy(pidptr, cp);
}
static const char comm_str[] = " comm=\"";
char *comm = strstr(str, comm_str);
if (comm) {
cp = comm;
comm += sizeof(comm_str) - 1;
char *ecomm = strchr(comm, '"');
if (ecomm) {
*ecomm = '\0';
}
comm = strdup(comm);
if (ecomm) {
strcpy(cp, ecomm + 1);
}
} else if (pid == getpid()) {
pid = tid;
comm = strdup("auditd");
} else if (!(comm = logbuf->pidToName(pid))) {
comm = strdup("unknown");
}
size_t l = strlen(comm) + 1;
size_t n = l + strlen(str) + 2;
char *newstr = reinterpret_cast<char *>(malloc(n));
if (!newstr) {
free(comm);
free(str);
return -ENOMEM;
}
*newstr = AUDIT_LOG_PRIO;
strcpy(newstr + 1, comm);
free(comm);
strcpy(newstr + 1 + l, str);
free(str);
unsigned short len = n; // cap to internal maximum
if (len != n) {
len = -1;
}
logbuf->log(AUDIT_LOG_ID, now, uid, pid, tid, newstr, len);
reader->notifyNewLog();
free(newstr);
return rc;
}
void LogAudit::logDmesg() {
int len = klogctl(KLOG_SIZE_BUFFER, NULL, 0);
if (len <= 0) {
return;
}
len++;
char buf[len];
int rc = klogctl(KLOG_READ_ALL, buf, len);
buf[len - 1] = '\0';
for(char *tok = buf; (rc >= 0) && ((tok = strtok(tok, "\r\n"))); tok = NULL) {
char *audit = strstr(tok, " audit(");
if (!audit) {
continue;
}
*audit++ = '\0';
char *type = strstr(tok, "type=");
if (type) {
rc = logPrint("%s %s", type, audit);
} else {
rc = logPrint("%s", audit);
}
}
}
int LogAudit::getLogSocket() {
int fd = audit_open();
if (fd < 0) {
return fd;
}
if (audit_set_pid(fd, getpid(), WAIT_YES) < 0) {
audit_close(fd);
fd = -1;
}
return fd;
}
|
