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/*
* 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/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) {
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;
}
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