diff options
Diffstat (limited to 'logd/LogAudit.cpp')
| -rw-r--r-- | logd/LogAudit.cpp | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/logd/LogAudit.cpp b/logd/LogAudit.cpp new file mode 100644 index 000000000..cc3e58329 --- /dev/null +++ b/logd/LogAudit.cpp @@ -0,0 +1,184 @@ +/* + * 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 "libaudit.h" +#include "LogAudit.h" + +LogAudit::LogAudit(LogBuffer *buf, LogReader *reader) + : SocketListener(getLogSocket(), false) + , logbuf(buf) + , reader(reader) { + logDmsg(); +} + +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; + } + + 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::logDmsg() { + 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; +} |