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/*
* ModSecurity for Apache 2.x, http://www.modsecurity.org/
* Copyright (c) 2004-2010 Breach Security, Inc. (http://www.breach.com/)
*
* This product is released under the terms of the General Public Licence,
* version 2 (GPLv2). Please refer to the file LICENSE (included with this
* distribution) which contains the complete text of the licence.
*
* There are special exceptions to the terms and conditions of the GPL
* as it is applied to this software. View the full text of the exception in
* file MODSECURITY_LICENSING_EXCEPTION in the directory of this software
* distribution.
*
* If any of the files related to licensing are missing or if you have any
* other questions related to licensing please contact Breach Security, Inc.
* directly using the email address support@breach.com.
*
*/
#include <sys/stat.h>
#include "mod_security2_config.h"
#include "re.h"
#include "msc_logging.h"
#include "httpd.h"
#include "apr_strings.h"
#include "apr_global_mutex.h"
#include "msc_util.h"
/**
* Write the supplied data to the audit log (if the FD is ready), update
* the size counters, update the hash context.
*/
static int sec_auditlog_write(modsec_rec *msr, const char *data, unsigned int len) {
apr_size_t nbytes_written, nbytes = len;
apr_status_t rc;
/* Do nothing if there's no data. */
if (data == NULL) return -1;
/* Update size counters and the hash calculation. We always do this,
* even in cases where write fails. That will make it easier to detect
* problems with partial writes.
*/
msr->new_auditlog_size += len;
apr_md5_update(&msr->new_auditlog_md5ctx, data, len);
/* Do not write if we do not have a file descriptor. */
if (msr->new_auditlog_fd == NULL) return -1;
/* Write data to file. */
rc = apr_file_write_full(msr->new_auditlog_fd, data, nbytes, &nbytes_written);
if (rc != APR_SUCCESS) {
msr_log(msr, 1, "Audit log: Failed writing (requested %" APR_SIZE_T_FMT
" bytes, written %" APR_SIZE_T_FMT ")", nbytes, nbytes_written);
/* Set to NULL to prevent more than one error message on
* out-of-disk-space events and to prevent further attempts
* to write to the same file in this request.
*
* Note that, as we opened the file through the pool mechanism of
* the APR, we do not need to close the file here. It will be closed
* automatically at the end of the request.
*/
msr->new_auditlog_fd = NULL;
return -1;
}
return 1;
}
/**
* Construct a log line in the vcombinedus format (see below).
*/
char *construct_log_vcombinedus(modsec_rec *msr) {
const char *local_user, *remote_user;
const char *referer, *user_agent, *uniqueid;
const char *sessionid;
/* remote log name */
if (msr->remote_user == NULL) remote_user = "-";
else remote_user = msr->remote_user;
/* authenticated user */
if (msr->local_user == NULL) local_user = "-";
else local_user = msr->local_user;
/* unique id */
uniqueid = msr->txid;
if (uniqueid == NULL) uniqueid = "-";
/* referer */
referer = "-";
/* Logging Referer is a waste of space.
referer = (char *)apr_table_get(msr->request_headers, "Referer");
if (referer == NULL) referer = "-";
*/
/* user agent */
user_agent = "-";
/* Logging User-Agent is a waste of space too.
user_agent = (char *)apr_table_get(msr->request_headers, "User-Agent");
if (user_agent == NULL) user_agent = "-";
*/
/* sessionid */
sessionid = (msr->sessionid == NULL ? "-" : msr->sessionid);
return apr_psprintf(msr->mp, "%s %s %s %s [%s] \"%s\" %u %" APR_OFF_T_FMT " \"%s\" \"%s\" %s \"%s\"",
log_escape_nq(msr->mp, msr->hostname), msr->remote_addr, log_escape_nq(msr->mp, remote_user),
log_escape_nq(msr->mp, local_user), current_logtime(msr->mp),
((msr->request_line == NULL) ? "" : log_escape(msr->mp, msr->request_line)),
msr->response_status, msr->bytes_sent, log_escape(msr->mp, referer),
log_escape(msr->mp, user_agent), log_escape(msr->mp, uniqueid), sessionid);
}
/**
* Constructs a log line in vcombined log format trying to truncate
* some of the fields to make the log line shorter than _limit bytes.
*/
char *construct_log_vcombinedus_limited(modsec_rec *msr, int _limit, int *was_limited) {
char *hostname;
char *local_user, *remote_user;
char *referer, *user_agent, *uniqueid;
const char *sessionid;
char *the_request, *bytes_sent;
int limit = _limit;
/* hostname */
hostname = (msr->hostname == NULL ? "-" : log_escape_nq(msr->mp, msr->hostname));
/* remote log name */
if (msr->remote_user == NULL) remote_user = "-";
else remote_user = log_escape_nq(msr->mp, msr->remote_user);
/* authenticated user */
if (msr->local_user == NULL) local_user = "-";
else local_user = log_escape_nq(msr->mp, msr->local_user);
/* unique id */
if (msr->txid == NULL) uniqueid = "-";
else uniqueid = log_escape(msr->mp, msr->txid);
/* referer */
referer = "-";
/*
referer = (char *)apr_table_get(msr->request_headers, "Referer");
if (referer == NULL) referer = "-";
else referer = log_escape(msr->mp, referer);
*/
/* user agent */
user_agent = "-";
/*
user_agent = (char *)apr_table_get(msr->request_headers, "User-Agent");
if (user_agent == NULL) user_agent = "-";
else user_agent = log_escape(msr->mp, user_agent);
*/
/* sessionid */
sessionid = (msr->sessionid == NULL) ? "-" : log_escape(msr->mp, msr->sessionid);
the_request = (msr->request_line == NULL) ? "" : log_escape(msr->mp, msr->request_line);
bytes_sent = apr_psprintf(msr->mp, "%" APR_OFF_T_FMT, msr->bytes_sent);
/* first take away the size of the
* information we must log
*/
limit -= 22; /* spaces and double quotes */
limit -= strlen(hostname); /* server name or IP */
limit -= strlen(msr->remote_addr); /* remote IP */
limit -= 28; /* current_logtime */
limit -= 3; /* status */
limit -= strlen(bytes_sent); /* bytes sent */
limit -= strlen(uniqueid); /* unique id */
limit -= strlen(sessionid); /* session id */
if (limit <= 0) {
msr_log(msr, 1, "GuardianLog: Atomic pipe write size too small: %d", PIPE_BUF);
return NULL;
}
/* we hope to be able to squeeze everything in */
if (limit < (int)(strlen(remote_user) + strlen(local_user) + strlen(referer)
+ strlen(user_agent) + strlen(the_request)))
{
/* Boo hoo hoo, there's not enough space available. */
*was_limited = 1;
/* Let's see if we can reduce the size of something. This
* is a very crude approach but it seems to work for our
* needs.
*/
if (strlen(remote_user) > 32) {
msr_log(msr, 9, "GuardianLog: Reduced remote_user to 32.");
remote_user[32] = '\0';
}
limit -= strlen(remote_user);
if (strlen(local_user) > 32) {
msr_log(msr, 9, "GuardianLog: Reduced local_user to 32.");
local_user[32] = '\0';
}
limit -= strlen(local_user);
if (strlen(referer) > 64) {
msr_log(msr, 9, "GuardianLog: Reduced referer to 64.");
referer[64] = '\0';
}
limit -= strlen(referer);
if (strlen(user_agent) > 64) {
msr_log(msr, 9, "GuardianLog: Reduced user_agent to 64.");
user_agent[64] = '\0';
}
limit -= strlen(user_agent);
if (limit <= 0) {
msr_log(msr, 1, "GuardianLog: Atomic pipe write size too small: %d.", PIPE_BUF);
return NULL;
}
/* use what's left for the request line */
if ((int)strlen(the_request) > limit) {
the_request[limit] = '\0';
msr_log(msr, 9, "GuardianLog: Reduced the_request to %d bytes.", limit);
}
} else {
/* Yay! We have enough space! */
*was_limited = 0;
}
return apr_psprintf(msr->mp, "%s %s %s %s [%s] \"%s\" %u %s \"%s\" \"%s\" %s \"%s\"",
hostname, msr->remote_addr, remote_user,
local_user, current_logtime(msr->mp), the_request,
msr->response_status, bytes_sent, referer, user_agent,
uniqueid, sessionid
);
}
/**
* Checks if the provided string is a valid audit log parts specification.
*/
int is_valid_parts_specification(char *p) {
char c, *t = p;
while((c = *(t++)) != '\0') {
if ((c != AUDITLOG_PART_ENDMARKER)&&((c < AUDITLOG_PART_FIRST)||(c > AUDITLOG_PART_LAST))) {
return 0;
}
}
return 1;
}
/**
* Constructs a filename that will be used to store an
* audit log entry.
*/
static char *construct_auditlog_filename(apr_pool_t *mp, const char *uniqueid) {
apr_time_exp_t t;
char tstr[300];
apr_size_t len;
apr_time_exp_lt(&t, apr_time_now());
apr_strftime(tstr, &len, 299, "/%Y%m%d/%Y%m%d-%H%M/%Y%m%d-%H%M%S", &t);
return apr_psprintf(mp, "%s-%s", tstr, uniqueid);
}
/**
* Creates a random 8-character string that
* consists of hexadecimal numbers, to be used
* as an audit log boundary.
*/
static char *create_auditlog_boundary(request_rec *r) {
unsigned long data = rand();
/* Do note that I tried using apr_generate_random_bytes but it turned
* out to be terribly slow for some reason. Needs further investigation.
*/
return bytes2hex(r->pool, (void *)&data, 4);
}
/**
* Sanitises the request line by removing the parameters
* that have been marked as sensitive.
*/
static void sanitise_request_line(modsec_rec *msr) {
const apr_array_header_t *tarr;
const apr_table_entry_t *telts;
int i;
char *qspos;
/* Locate the query string. */
qspos = strstr(msr->request_line, "?");
if (qspos == NULL) return;
qspos++;
/* Loop through the list of sensitive parameters. */
tarr = apr_table_elts(msr->arguments_to_sanitise);
telts = (const apr_table_entry_t*)tarr->elts;
for (i = 0; i < tarr->nelts; i++) {
msc_arg *arg = (msc_arg *)telts[i].val;
/* Only look at the parameters that appeared in the query string. */
if (strcmp(arg->origin, "QUERY_STRING") == 0) {
char *p;
int j;
/* Go to the beginning of the parameter. */
p = qspos;
j = arg->value_origin_offset;
while((*p != '\0')&&(j--)) p++;
if (*p == '\0') {
msr_log(msr, 1, "Unable to sanitise variable \"%s\" at offset %u of QUERY_STRING"
"because the request line is too short.",
log_escape_ex(msr->mp, arg->name, arg->name_len),
arg->value_origin_offset);
continue;
}
/* Write over the value. */
j = arg->value_origin_len;
while((*p != '\0')&&(j--)) {
*p++ = '*';
}
if (*p == '\0') {
msr_log(msr, 1, "Unable to sanitise variable \"%s\" at offset %u (size %d) "
"of QUERY_STRING because the request line is too short.",
log_escape_ex(msr->mp, arg->name, arg->name_len),
arg->value_origin_offset, arg->value_origin_len);
continue;
}
}
}
}
/**
* Output the Producer header.
*/
static void sec_auditlog_write_producer_header(modsec_rec *msr) {
char **signatures = NULL;
char *text = NULL;
int i;
/* Try to write everything in one go. */
if (msr->txcfg->component_signatures->nelts == 0) {
text = apr_psprintf(msr->mp, "Producer: %s.\n", MODSEC_MODULE_NAME_FULL);
sec_auditlog_write(msr, text, strlen(text));
return;
}
/* Start with the ModSecurity signature. */
text = apr_psprintf(msr->mp, "Producer: %s", MODSEC_MODULE_NAME_FULL);
sec_auditlog_write(msr, text, strlen(text));
/* Then loop through the components and output individual signatures. */
signatures = (char **)msr->txcfg->component_signatures->elts;
for(i = 0; i < msr->txcfg->component_signatures->nelts; i++) {
text = apr_psprintf(msr->mp, "; %s", (char *)signatures[i]);
sec_auditlog_write(msr, text, strlen(text));
}
sec_auditlog_write(msr, ".\n", 2);
}
/**
* Produce an audit log entry.
*/
void sec_audit_logger(modsec_rec *msr) {
const apr_array_header_t *arr = NULL;
apr_table_entry_t *te = NULL;
char *str1 = NULL, *str2 = NULL, *text = NULL;
const msre_rule *rule = NULL;
apr_size_t nbytes, nbytes_written;
unsigned char md5hash[APR_MD5_DIGESTSIZE];
int was_limited = 0;
int wrote_response_body = 0;
char *entry_filename, *entry_basename;
apr_status_t rc;
int i, limit;
/* the boundary is used by both audit log types */
msr->new_auditlog_boundary = create_auditlog_boundary(msr->r);
/* Return silently if we don't have a request line. This
* means we will not be logging request timeouts.
*/
if (msr->request_line == NULL) {
msr_log(msr, 4, "Audit log: Skipping request whose request_line is null.");
return;
}
/* Also return silently if we don't have a file descriptor. */
if (msr->txcfg->auditlog_fd == NULL) {
msr_log(msr, 4, "Audit log: Skipping request since there is nowhere to write to.");
return;
}
if (msr->txcfg->auditlog_type != AUDITLOG_CONCURRENT) {
/* Serial logging - we already have an open file
* descriptor to write to.
*/
msr->new_auditlog_fd = msr->txcfg->auditlog_fd;
} else {
/* Concurrent logging - we need to create a brand
* new file for this request.
*/
apr_md5_init(&msr->new_auditlog_md5ctx);
msr->new_auditlog_filename = construct_auditlog_filename(msr->mp, msr->txid);
if (msr->new_auditlog_filename == NULL) return;
/* The audit log storage directory should be explicitly
* defined. But if it isn't try to write to the same
* directory where the index file is placed. Of course,
* it is *very* bad practice to allow the Apache user
* to write to the same directory where a root user is
* writing to but it's not us that's causing the problem
* and there isn't anything we can do about that.
*
* ENH Actually there is something we can do! We will make
* SecAuditStorageDir mandatory, ask the user to explicitly
* define the storage location *and* refuse to work if the
* index and the storage location are in the same folder.
*/
if (msr->txcfg->auditlog_storage_dir == NULL) {
entry_filename = file_dirname(msr->mp, msr->txcfg->auditlog_name);
}
else {
entry_filename = msr->txcfg->auditlog_storage_dir;
}
if (entry_filename == NULL) return;
entry_filename = apr_psprintf(msr->mp, "%s%s", entry_filename, msr->new_auditlog_filename);
if (entry_filename == NULL) return;
entry_basename = file_dirname(msr->mp, entry_filename);
if (entry_basename == NULL) return;
/* IMP1 Surely it would be more efficient to check the folders for
* the audit log repository base path in the configuration phase, to reduce
* the work we do on every request. Also, since our path depends on time,
* we could cache the time we last checked and don't check if we know
* the folder is there.
*/
rc = apr_dir_make_recursive(entry_basename, msr->txcfg->auditlog_dirperms, msr->mp);
if (rc != APR_SUCCESS) {
msr_log(msr, 1, "Audit log: Failed to create subdirectories: %s (%s)",
entry_basename, get_apr_error(msr->mp, rc));
return;
}
rc = apr_file_open(&msr->new_auditlog_fd, entry_filename,
APR_WRITE | APR_TRUNCATE | APR_CREATE | APR_BINARY | APR_FILE_NOCLEANUP,
msr->txcfg->auditlog_fileperms, msr->mp);
if (rc != APR_SUCCESS) {
msr_log(msr, 1, "Audit log: Failed to create file: %s (%s)",
entry_filename, get_apr_error(msr->mp, rc));
return;
}
}
/* Lock the mutex, but only if we are using serial format. */
if (msr->txcfg->auditlog_type != AUDITLOG_CONCURRENT) {
rc = apr_global_mutex_lock(msr->modsecurity->auditlog_lock);
if (rc != APR_SUCCESS) {
msr_log(msr, 1, "Audit log: Failed to lock global mutex: %s",
get_apr_error(msr->mp, rc));
}
}
/* AUDITLOG_PART_HEADER */
text = apr_psprintf(msr->mp, "--%s-%c--\n", msr->new_auditlog_boundary, AUDITLOG_PART_HEADER);
sec_auditlog_write(msr, text, strlen(text));
/* Format: time transaction_id remote_addr remote_port local_addr local_port */
text = apr_psprintf(msr->mp, "[%s] %s %s %u %s %u",
current_logtime(msr->mp), msr->txid, msr->remote_addr, msr->remote_port,
msr->local_addr, msr->local_port);
sec_auditlog_write(msr, text, strlen(text));
/* AUDITLOG_PART_REQUEST_HEADERS */
if (strchr(msr->txcfg->auditlog_parts, AUDITLOG_PART_REQUEST_HEADERS) != NULL) {
text = apr_psprintf(msr->mp, "\n--%s-%c--\n", msr->new_auditlog_boundary, AUDITLOG_PART_REQUEST_HEADERS);
sec_auditlog_write(msr, text, strlen(text));
sanitise_request_line(msr);
sec_auditlog_write(msr, msr->request_line, strlen(msr->request_line));
sec_auditlog_write(msr, "\n", 1);
arr = apr_table_elts(msr->request_headers);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
text = apr_psprintf(msr->mp, "%s: %s\n", te[i].key, te[i].val);
/* Do we need to sanitise this request header? */
if (apr_table_get(msr->request_headers_to_sanitise, te[i].key) != NULL) {
/* Yes, sanitise it. */
memset(text + strlen(te[i].key) + 2, '*', strlen(te[i].val));
}
sec_auditlog_write(msr, text, strlen(text));
}
}
/* AUDITLOG_PART_REQUEST_BODY */
/* Output this part of it was explicitly requested (C) or if it was the faked
* request body that was requested (I) but we have no reason to fake it (it's
* already in the correct format).
*/
if ( (strchr(msr->txcfg->auditlog_parts, AUDITLOG_PART_REQUEST_BODY) != NULL)
|| ( (strchr(msr->txcfg->auditlog_parts, AUDITLOG_PART_FAKE_REQUEST_BODY) != NULL)
&& (msr->mpd == NULL) ) )
{
if (msr->msc_reqbody_read) {
const apr_array_header_t *tarr;
const apr_table_entry_t *telts;
apr_array_header_t *sorted_args;
unsigned int offset = 0, last_offset = 0;
msc_arg *nextarg = NULL;
int sanitise = 0; /* IMP1 Use constants for "sanitise" values. */
char *my_error_msg = NULL;
sorted_args = apr_array_make(msr->mp, 25, sizeof(const msc_arg *));
/* First we need to sort the arguments that need to be
* sanitised in descending order (we are using a stack structure
* to store then so the order will be ascending when we start
* popping them out). This is because we will
* be reading the request body sequentially and must
* sanitise it as we go.
*/
for(;;) {
nextarg = NULL;
/* Find the next largest offset (excluding
* the ones we've used up already).
*/
tarr = apr_table_elts(msr->arguments_to_sanitise);
telts = (const apr_table_entry_t*)tarr->elts;
for(i = 0; i < tarr->nelts; i++) {
msc_arg *arg = (msc_arg *)telts[i].val;
if (strcmp(arg->origin, "BODY") != 0) continue;
if (last_offset == 0) { /* The first time we're here. */
if (arg->value_origin_offset > offset) {
offset = arg->value_origin_offset;
nextarg = arg;
}
} else { /* Not the first time. */
if ((arg->value_origin_offset > offset)
&&(arg->value_origin_offset < last_offset))
{
offset = arg->value_origin_offset;
nextarg = arg;
}
}
}
/* If we don't have the next argument that means
* we're done here.
*/
if (nextarg == NULL) break;
sanitise = 2; /* Means time to pop the next argument out. */
last_offset = offset;
offset = 0;
{ /* IMP1 Fix this ugly bit here. */
msc_arg **x = apr_array_push(sorted_args);
*x = nextarg;
}
}
/* Now start retrieving the body chunk by chunk and
* sanitise data in pieces.
*/
rc = modsecurity_request_body_retrieve_start(msr, &my_error_msg);
if (rc < 0) {
msr_log(msr, 1, "Audit log: %s", my_error_msg);
} else {
msc_data_chunk *chunk = NULL;
unsigned int chunk_offset = 0;
unsigned int sanitise_offset = 0;
unsigned int sanitise_length = 0;
text = apr_psprintf(msr->mp, "\n--%s-%c--\n", msr->new_auditlog_boundary, AUDITLOG_PART_REQUEST_BODY);
sec_auditlog_write(msr, text, strlen(text));
for(;;) {
rc = modsecurity_request_body_retrieve(msr, &chunk, -1, &my_error_msg);
if (chunk != NULL) {
/* Anything greater than 1 means we have more data to sanitise. */
while (sanitise > 1) {
msc_arg **arg = NULL;
if (sanitise == 2) {
/* Get the next argument from the stack. */
arg = (msc_arg **)apr_array_pop(sorted_args);
if (arg == NULL) sanitise = 0; /* We're done sanitising. */
else {
/* Continue with sanitation to process the
* retrieved argument.
*/
sanitise = 1;
sanitise_offset = (*arg)->value_origin_offset;
sanitise_length = (*arg)->value_origin_len;
}
}
if (sanitise) {
/* Check if the data we want to sanitise is
* stored in the current chunk.
*/
if (chunk_offset + chunk->length > sanitise_offset) {
unsigned int soff; /* data offset within chunk */
unsigned int len; /* amount in this chunk to sanitise */
soff = sanitise_offset - chunk_offset;
if (soff + sanitise_length <= chunk->length) {
/* The entire argument resides in the current chunk. */
len = sanitise_length;
sanitise = 2; /* Get another parameter to sanitise. */
} else {
/* Some work to do here but we'll need to seek
* another chunk.
*/
len = chunk->length - soff;
sanitise_offset += len;
sanitise_length -= len;
sanitise = 1; /* It's OK to go to the next chunk. */
}
/* Yes, we actually write over the original data.
* We shouldn't be needing it any more.
*/
if (soff + len <= chunk->length) { /* double check */
memset((char *)chunk->data + soff, '*', len);
}
}
}
}
/* Write the sanitised chunk to the log
* and advance to the next chunk. */
sec_auditlog_write(msr, chunk->data, chunk->length);
chunk_offset += chunk->length;
}
if (rc <= 0) {
break;
}
}
if (rc < 0) {
msr_log(msr, 1, "Audit log: %s", my_error_msg);
}
modsecurity_request_body_retrieve_end(msr);
}
}
}
/* AUDITLOG_PART_FAKE_REQUEST_BODY */
if (strchr(msr->txcfg->auditlog_parts, AUDITLOG_PART_FAKE_REQUEST_BODY) != NULL) {
if ((msr->msc_reqbody_read)&&(msr->mpd != NULL)) {
char *buffer = NULL;
buffer = multipart_reconstruct_urlencoded_body_sanitise(msr);
if (buffer == NULL) {
msr_log(msr, 1, "Audit log: Failed to reconstruct request body.");
} else {
text = apr_psprintf(msr->mp, "\n--%s-%c--\n", msr->new_auditlog_boundary, AUDITLOG_PART_FAKE_REQUEST_BODY);
sec_auditlog_write(msr, text, strlen(text));
sec_auditlog_write(msr, buffer, strlen(buffer));
}
}
}
/* AUDITLOG_PART_A_RESPONSE_HEADERS */
if (strchr(msr->txcfg->auditlog_parts, AUDITLOG_PART_A_RESPONSE_HEADERS) != NULL) {
text = apr_psprintf(msr->mp, "\n--%s-%c--\n", msr->new_auditlog_boundary, AUDITLOG_PART_A_RESPONSE_HEADERS);
sec_auditlog_write(msr, text, strlen(text));
/* There are no response headers (or the status line) in HTTP 0.9 */
if (msr->response_headers_sent) {
if (msr->status_line != NULL) {
text = apr_psprintf(msr->mp, "%s %s\n", msr->response_protocol,
msr->status_line);
} else {
text = apr_psprintf(msr->mp, "%s %u\n", msr->response_protocol,
msr->response_status);
}
sec_auditlog_write(msr, text, strlen(text));
/* Output headers */
arr = apr_table_elts(msr->response_headers);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
text = apr_psprintf(msr->mp, "%s: %s\n", te[i].key, te[i].val);
/* Do we need to sanitise this response header? */
if (apr_table_get(msr->response_headers_to_sanitise, te[i].key) != NULL) {
/* Yes, sanitise it. */
memset(text + strlen(te[i].key) + 2, '*', strlen(te[i].val));
}
sec_auditlog_write(msr, text, strlen(text));
}
}
}
/* AUDITLOG_PART_RESPONSE_BODY */
if (strchr(msr->txcfg->auditlog_parts, AUDITLOG_PART_RESPONSE_BODY) != NULL) {
if (msr->resbody_data != NULL) {
text = apr_psprintf(msr->mp, "\n--%s-%c--\n", msr->new_auditlog_boundary, AUDITLOG_PART_RESPONSE_BODY);
sec_auditlog_write(msr, text, strlen(text));
sec_auditlog_write(msr, msr->resbody_data, msr->resbody_length);
wrote_response_body = 1;
}
}
/* AUDITLOG_PART_TRAILER */
if (strchr(msr->txcfg->auditlog_parts, AUDITLOG_PART_TRAILER) != NULL) {
apr_time_t now = apr_time_now();
text = apr_psprintf(msr->mp, "\n--%s-%c--\n", msr->new_auditlog_boundary, AUDITLOG_PART_TRAILER);
sec_auditlog_write(msr, text, strlen(text));
/* Messages */
for(i = 0; i < msr->alerts->nelts; i++) {
text = apr_psprintf(msr->mp, "Message: %s\n", ((char **)msr->alerts->elts)[i]);
sec_auditlog_write(msr, text, strlen(text));
}
/* Apache error messages */
for(i = 0; i < msr->error_messages->nelts; i++) {
error_message *em = (((error_message**)msr->error_messages->elts)[i]);
text = apr_psprintf(msr->mp, "Apache-Error: %s\n",
format_error_log_message(msr->mp, em));
sec_auditlog_write(msr, text, strlen(text));
}
/* Action */
if (msr->was_intercepted) {
text = apr_psprintf(msr->mp, "Action: Intercepted (phase %d)\n", msr->intercept_phase);
sec_auditlog_write(msr, text, strlen(text));
}
/* Apache-Handler */
if (msr->r->handler != NULL) {
text = apr_psprintf(msr->mp, "Apache-Handler: %s\n", msr->r->handler);
sec_auditlog_write(msr, text, strlen(text));
}
/* Processing times */
if (msr->time_checkpoint_1 == 0) {
text = apr_psprintf(msr->mp, "Stopwatch: %" APR_TIME_T_FMT " %" APR_TIME_T_FMT
" (- - -)\n", (msr->request_time), (now - msr->request_time));
} else {
char sw_str2[101] = "-";
char sw_str3[101] = "-";
if (msr->time_checkpoint_2 != 0) {
apr_snprintf(sw_str2, sizeof(sw_str2), "%" APR_TIME_T_FMT,
(msr->time_checkpoint_2 - msr->request_time));
}
if (msr->time_checkpoint_3 != 0) {
apr_snprintf(sw_str3, sizeof(sw_str3), "%" APR_TIME_T_FMT,
(msr->time_checkpoint_3 - msr->request_time));
}
text = apr_psprintf(msr->mp, "Stopwatch: %" APR_TIME_T_FMT
" %" APR_TIME_T_FMT " (%" APR_TIME_T_FMT
"%s %s %s)\n",
(msr->request_time), (now - msr->request_time),
(msr->time_checkpoint_1 - msr->request_time),
((msr->msc_reqbody_read == 0) ? "" : "*"),
sw_str2, sw_str3
);
}
sec_auditlog_write(msr, text, strlen(text));
/* Our response body does not contain chunks */
/* ENH Only write this when the output was chunked. */
/* ENH Add info when request body was decompressed, dechunked too. */
if (wrote_response_body) {
text = apr_psprintf(msr->mp, "Response-Body-Transformed: Dechunked\n");
sec_auditlog_write(msr, text, strlen(text));
}
sec_auditlog_write_producer_header(msr);
/* Server */
if (msr->server_software != NULL) {
text = apr_psprintf(msr->mp, "Server: %s\n", msr->server_software);
sec_auditlog_write(msr, text, strlen(text));
}
/* Sanitised arguments */
{
const apr_array_header_t *tarr;
const apr_table_entry_t *telts;
tarr = apr_table_elts(msr->arguments_to_sanitise);
telts = (const apr_table_entry_t*)tarr->elts;
if (tarr->nelts > 0) {
text = apr_psprintf(msr->mp, "Sanitised-Args: ");
sec_auditlog_write(msr, text, strlen(text));
}
for(i = 0; i < tarr->nelts; i++) {
msc_arg *arg = (msc_arg *)telts[i].val;
text = apr_psprintf(msr->mp, "%s\"%s\"%s", ((i == 0) ? "" : ", "),
log_escape(msr->mp, arg->name), ((i == (tarr->nelts - 1)) ? ".\n" : ""));
sec_auditlog_write(msr, text, strlen(text));
}
}
/* Sanitised request headers */
{
const apr_array_header_t *tarr;
const apr_table_entry_t *telts;
tarr = apr_table_elts(msr->request_headers_to_sanitise);
telts = (const apr_table_entry_t*)tarr->elts;
if (tarr->nelts > 0) {
text = apr_psprintf(msr->mp, "Sanitised-Request-Headers: ");
sec_auditlog_write(msr, text, strlen(text));
}
for(i = 0; i < tarr->nelts; i++) {
text = apr_psprintf(msr->mp, "%s\"%s\"%s", ((i == 0) ? "" : ", "),
log_escape(msr->mp, telts[i].key), ((i == (tarr->nelts - 1)) ? ".\n" : ""));
sec_auditlog_write(msr, text, strlen(text));
}
}
/* Sanitised response headers */
{
const apr_array_header_t *tarr;
const apr_table_entry_t *telts;
tarr = apr_table_elts(msr->response_headers_to_sanitise);
telts = (const apr_table_entry_t*)tarr->elts;
if (tarr->nelts > 0) {
text = apr_psprintf(msr->mp, "Sanitised-Response-Headers: ");
sec_auditlog_write(msr, text, strlen(text));
}
for(i = 0; i < tarr->nelts; i++) {
text = apr_psprintf(msr->mp, "%s\"%s\"%s", ((i == 0) ? "" : ", "),
log_escape(msr->mp, telts[i].key), ((i == (tarr->nelts - 1)) ? ".\n" : ""));
sec_auditlog_write(msr, text, strlen(text));
}
}
/* Web application info. */
if ( ((msr->txcfg->webappid != NULL)&&(strcmp(msr->txcfg->webappid, "default") != 0))
|| (msr->sessionid != NULL) || (msr->userid != NULL))
{
text = apr_psprintf(msr->mp, "WebApp-Info: \"%s\" \"%s\" \"%s\"\n",
msr->txcfg->webappid == NULL ? "-" : log_escape(msr->mp, msr->txcfg->webappid),
msr->sessionid == NULL ? "-" : log_escape(msr->mp, msr->sessionid),
msr->userid == NULL ? "-" : log_escape(msr->mp, msr->userid));
sec_auditlog_write(msr, text, strlen(text));
}
}
/* AUDITLOG_PART_UPLOADS */
/* ENH: Implement */
/* AUDITLOG_PART_MATCHEDRULES */
if (strchr(msr->txcfg->auditlog_parts, AUDITLOG_PART_MATCHEDRULES) != NULL) {
text = apr_psprintf(msr->mp, "\n--%s-%c--\n", msr->new_auditlog_boundary, AUDITLOG_PART_MATCHEDRULES);
sec_auditlog_write(msr, text, strlen(text));
/* Matched Rules */
for(i = 0; i < msr->matched_rules->nelts; i++) {
rule = ((msre_rule **)msr->matched_rules->elts)[i];
text = apr_psprintf(msr->mp, "%s\n", rule->unparsed);
sec_auditlog_write(msr, text, strlen(text));
}
}
/* AUDITLOG_PART_ENDMARKER */
text = apr_psprintf(msr->mp, "\n--%s-%c--\n", msr->new_auditlog_boundary, AUDITLOG_PART_ENDMARKER);
sec_auditlog_write(msr, text, strlen(text));
/* Return here if we were writing to a serial log
* as it does not need an index file.
*/
if (msr->txcfg->auditlog_type != AUDITLOG_CONCURRENT) {
sec_auditlog_write(msr, "\n", 1);
/* Unlock the mutex we used to serialise access to the audit log file. */
rc = apr_global_mutex_unlock(msr->modsecurity->auditlog_lock);
if (rc != APR_SUCCESS) {
msr_log(msr, 1, "Audit log: Failed to unlock global mutex: %s",
get_apr_error(msr->mp, rc));
}
return;
}
/* From here on only concurrent-style processing. */
apr_file_close(msr->new_auditlog_fd);
/* Write an entry to the index file */
/* Calculate hash of the entry. */
apr_md5_final(md5hash, &msr->new_auditlog_md5ctx);
str2 = apr_psprintf(msr->mp, "%s %d %d md5:%s", msr->new_auditlog_filename, 0,
msr->new_auditlog_size, bytes2hex(msr->mp, md5hash, 16));
if (str2 == NULL) return;
/* We do not want the index line to be longer than 3980 bytes. */
limit = 3980;
was_limited = 0;
/* If we are logging to a pipe we need to observe and
* obey the pipe atomic write limit - PIPE_BUF. For
* more details see the discussion in sec_guardian_logger code.
*/
if (msr->txcfg->auditlog_name[0] == '|') {
if (PIPE_BUF < limit) {
limit = PIPE_BUF;
}
}
limit = limit - strlen(str2) - 5;
if (limit <= 0) {
msr_log(msr, 1, "Audit Log: Atomic PIPE write buffer too small: %d", PIPE_BUF);
return;
}
str1 = construct_log_vcombinedus_limited(msr, limit, &was_limited);
if (str1 == NULL) return;
if (was_limited == 0) {
text = apr_psprintf(msr->mp, "%s %s \n", str1, str2);
} else {
text = apr_psprintf(msr->mp, "%s %s L\n", str1, str2);
}
if (text == NULL) return;
nbytes = strlen(text);
if (msr->txcfg->debuglog_level >= 9) {
msr_log(msr, 9, "Audit Log: Writing %" APR_SIZE_T_FMT " bytes to primary concurrent index", nbytes);
}
apr_file_write_full(msr->txcfg->auditlog_fd, text, nbytes, &nbytes_written);
/* Write to the secondary audit log if we have one */
if (msr->txcfg->auditlog2_fd != NULL) {
if (msr->txcfg->debuglog_level >= 9) {
msr_log(msr, 9, "Audit Log: Writing %" APR_SIZE_T_FMT " bytes to secondary concurrent index", nbytes);
}
apr_file_write_full(msr->txcfg->auditlog2_fd, text, nbytes, &nbytes_written);
}
}
|